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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e114e473 CS |
2 | /* |
3 | * Simplified MAC Kernel (smack) security module | |
4 | * | |
5 | * This file contains the smack hook function implementations. | |
6 | * | |
5c6d1125 | 7 | * Authors: |
e114e473 | 8 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 9 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
10 | * |
11 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 12 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 13 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 14 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 15 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
16 | */ |
17 | ||
18 | #include <linux/xattr.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/stat.h> | |
e114e473 CS |
22 | #include <linux/kd.h> |
23 | #include <asm/ioctls.h> | |
07feee8f | 24 | #include <linux/ip.h> |
e114e473 CS |
25 | #include <linux/tcp.h> |
26 | #include <linux/udp.h> | |
c6739443 | 27 | #include <linux/dccp.h> |
d66a8acb | 28 | #include <linux/icmpv6.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
e114e473 | 30 | #include <linux/mutex.h> |
e114e473 | 31 | #include <net/cipso_ipv4.h> |
c6739443 CS |
32 | #include <net/ip.h> |
33 | #include <net/ipv6.h> | |
d20bdda6 | 34 | #include <linux/audit.h> |
1fd7317d | 35 | #include <linux/magic.h> |
2a7dba39 | 36 | #include <linux/dcache.h> |
16014d87 | 37 | #include <linux/personality.h> |
40401530 AV |
38 | #include <linux/msg.h> |
39 | #include <linux/shm.h> | |
40 | #include <linux/binfmts.h> | |
3bf2789c | 41 | #include <linux/parser.h> |
2febd254 DH |
42 | #include <linux/fs_context.h> |
43 | #include <linux/fs_parser.h> | |
a8478a60 | 44 | #include <linux/watch_queue.h> |
e114e473 CS |
45 | #include "smack.h" |
46 | ||
5c6d1125 JS |
47 | #define TRANS_TRUE "TRUE" |
48 | #define TRANS_TRUE_SIZE 4 | |
49 | ||
c6739443 CS |
50 | #define SMK_CONNECTING 0 |
51 | #define SMK_RECEIVING 1 | |
52 | #define SMK_SENDING 2 | |
53 | ||
00720f0e | 54 | static DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 55 | static LIST_HEAD(smk_ipv6_port_list); |
4e328b08 | 56 | struct kmem_cache *smack_rule_cache; |
bfc3cac0 | 57 | int smack_enabled __initdata; |
c6739443 | 58 | |
c3300aaf AV |
59 | #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s} |
60 | static struct { | |
61 | const char *name; | |
62 | int len; | |
63 | int opt; | |
64 | } smk_mount_opts[] = { | |
6e7739fc | 65 | {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault}, |
c3300aaf | 66 | A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute) |
3bf2789c | 67 | }; |
c3300aaf AV |
68 | #undef A |
69 | ||
70 | static int match_opt_prefix(char *s, int l, char **arg) | |
71 | { | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) { | |
75 | size_t len = smk_mount_opts[i].len; | |
76 | if (len > l || memcmp(s, smk_mount_opts[i].name, len)) | |
77 | continue; | |
78 | if (len == l || s[len] != '=') | |
79 | continue; | |
80 | *arg = s + len + 1; | |
81 | return smk_mount_opts[i].opt; | |
82 | } | |
83 | return Opt_error; | |
84 | } | |
3bf2789c | 85 | |
3d04c924 CS |
86 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
87 | static char *smk_bu_mess[] = { | |
88 | "Bringup Error", /* Unused */ | |
89 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
90 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
91 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
92 | }; | |
93 | ||
d166c802 CS |
94 | static void smk_bu_mode(int mode, char *s) |
95 | { | |
96 | int i = 0; | |
97 | ||
98 | if (mode & MAY_READ) | |
99 | s[i++] = 'r'; | |
100 | if (mode & MAY_WRITE) | |
101 | s[i++] = 'w'; | |
102 | if (mode & MAY_EXEC) | |
103 | s[i++] = 'x'; | |
104 | if (mode & MAY_APPEND) | |
105 | s[i++] = 'a'; | |
106 | if (mode & MAY_TRANSMUTE) | |
107 | s[i++] = 't'; | |
108 | if (mode & MAY_LOCK) | |
109 | s[i++] = 'l'; | |
110 | if (i == 0) | |
111 | s[i++] = '-'; | |
112 | s[i] = '\0'; | |
113 | } | |
114 | #endif | |
115 | ||
116 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
117 | static int smk_bu_note(char *note, struct smack_known *sskp, |
118 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
119 | { |
120 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
121 | ||
122 | if (rc <= 0) | |
123 | return rc; | |
bf4b2fee CS |
124 | if (rc > SMACK_UNCONFINED_OBJECT) |
125 | rc = 0; | |
d166c802 CS |
126 | |
127 | smk_bu_mode(mode, acc); | |
bf4b2fee | 128 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 129 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
130 | return 0; |
131 | } | |
132 | #else | |
21c7eae2 | 133 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
134 | #endif |
135 | ||
136 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
137 | static int smk_bu_current(char *note, struct smack_known *oskp, |
138 | int mode, int rc) | |
d166c802 | 139 | { |
b17103a8 | 140 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 CS |
141 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
142 | ||
143 | if (rc <= 0) | |
144 | return rc; | |
bf4b2fee CS |
145 | if (rc > SMACK_UNCONFINED_OBJECT) |
146 | rc = 0; | |
d166c802 CS |
147 | |
148 | smk_bu_mode(mode, acc); | |
bf4b2fee | 149 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
150 | tsp->smk_task->smk_known, oskp->smk_known, |
151 | acc, current->comm, note); | |
d166c802 CS |
152 | return 0; |
153 | } | |
154 | #else | |
21c7eae2 | 155 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
156 | #endif |
157 | ||
158 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
159 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
160 | { | |
b17103a8 | 161 | struct task_smack *tsp = smack_cred(current_cred()); |
1fb057dc | 162 | struct smack_known *smk_task = smk_of_task_struct_obj(otp); |
d166c802 CS |
163 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
164 | ||
165 | if (rc <= 0) | |
166 | return rc; | |
bf4b2fee CS |
167 | if (rc > SMACK_UNCONFINED_OBJECT) |
168 | rc = 0; | |
d166c802 CS |
169 | |
170 | smk_bu_mode(mode, acc); | |
bf4b2fee | 171 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 172 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
173 | current->comm, otp->comm); |
174 | return 0; | |
175 | } | |
176 | #else | |
177 | #define smk_bu_task(otp, mode, RC) (RC) | |
178 | #endif | |
179 | ||
180 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
181 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
182 | { | |
b17103a8 | 183 | struct task_smack *tsp = smack_cred(current_cred()); |
fb4021b6 | 184 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
185 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
186 | ||
bf4b2fee CS |
187 | if (isp->smk_flags & SMK_INODE_IMPURE) |
188 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
189 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
190 | ||
d166c802 CS |
191 | if (rc <= 0) |
192 | return rc; | |
bf4b2fee CS |
193 | if (rc > SMACK_UNCONFINED_OBJECT) |
194 | rc = 0; | |
195 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
196 | (mode & (MAY_WRITE | MAY_APPEND))) | |
197 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
198 | |
199 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
200 | |
201 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
202 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
203 | inode->i_sb->s_id, inode->i_ino, current->comm); |
204 | return 0; | |
205 | } | |
206 | #else | |
207 | #define smk_bu_inode(inode, mode, RC) (RC) | |
208 | #endif | |
209 | ||
210 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
211 | static int smk_bu_file(struct file *file, int mode, int rc) | |
212 | { | |
b17103a8 | 213 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 | 214 | struct smack_known *sskp = tsp->smk_task; |
5e7270a6 | 215 | struct inode *inode = file_inode(file); |
fb4021b6 | 216 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
217 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
218 | ||
bf4b2fee CS |
219 | if (isp->smk_flags & SMK_INODE_IMPURE) |
220 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
221 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
222 | ||
d166c802 CS |
223 | if (rc <= 0) |
224 | return rc; | |
bf4b2fee CS |
225 | if (rc > SMACK_UNCONFINED_OBJECT) |
226 | rc = 0; | |
d166c802 CS |
227 | |
228 | smk_bu_mode(mode, acc); | |
bf4b2fee | 229 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 230 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 231 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
232 | current->comm); |
233 | return 0; | |
234 | } | |
235 | #else | |
236 | #define smk_bu_file(file, mode, RC) (RC) | |
237 | #endif | |
238 | ||
239 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
240 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
241 | int mode, int rc) | |
242 | { | |
b17103a8 | 243 | struct task_smack *tsp = smack_cred(cred); |
d166c802 | 244 | struct smack_known *sskp = tsp->smk_task; |
45063097 | 245 | struct inode *inode = file_inode(file); |
fb4021b6 | 246 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
247 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
248 | ||
bf4b2fee CS |
249 | if (isp->smk_flags & SMK_INODE_IMPURE) |
250 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
251 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
252 | ||
d166c802 CS |
253 | if (rc <= 0) |
254 | return rc; | |
bf4b2fee CS |
255 | if (rc > SMACK_UNCONFINED_OBJECT) |
256 | rc = 0; | |
d166c802 CS |
257 | |
258 | smk_bu_mode(mode, acc); | |
bf4b2fee | 259 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 260 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 261 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
262 | current->comm); |
263 | return 0; | |
264 | } | |
265 | #else | |
266 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
267 | #endif | |
268 | ||
e114e473 CS |
269 | /** |
270 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 271 | * @name: type of the label (attribute) |
e114e473 CS |
272 | * @ip: a pointer to the inode |
273 | * @dp: a pointer to the dentry | |
274 | * | |
e774ad68 LP |
275 | * Returns a pointer to the master list entry for the Smack label, |
276 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 277 | */ |
2f823ff8 CS |
278 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
279 | struct dentry *dp) | |
e114e473 CS |
280 | { |
281 | int rc; | |
f7112e6c | 282 | char *buffer; |
2f823ff8 | 283 | struct smack_known *skp = NULL; |
e114e473 | 284 | |
5d6c3191 | 285 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 286 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 287 | |
e5bfad3d | 288 | buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS); |
f7112e6c | 289 | if (buffer == NULL) |
e774ad68 | 290 | return ERR_PTR(-ENOMEM); |
e114e473 | 291 | |
5d6c3191 | 292 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
293 | if (rc < 0) |
294 | skp = ERR_PTR(rc); | |
295 | else if (rc == 0) | |
296 | skp = NULL; | |
297 | else | |
2f823ff8 | 298 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
299 | |
300 | kfree(buffer); | |
301 | ||
2f823ff8 | 302 | return skp; |
e114e473 CS |
303 | } |
304 | ||
305 | /** | |
afb1cbe3 | 306 | * init_inode_smack - initialize an inode security blob |
a1a07f22 | 307 | * @inode: inode to extract the info from |
21c7eae2 | 308 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 | 309 | * |
e114e473 | 310 | */ |
afb1cbe3 | 311 | static void init_inode_smack(struct inode *inode, struct smack_known *skp) |
e114e473 | 312 | { |
afb1cbe3 | 313 | struct inode_smack *isp = smack_inode(inode); |
e114e473 | 314 | |
21c7eae2 | 315 | isp->smk_inode = skp; |
e114e473 | 316 | isp->smk_flags = 0; |
e114e473 CS |
317 | } |
318 | ||
7898e1f8 | 319 | /** |
bbd3662a CS |
320 | * init_task_smack - initialize a task security blob |
321 | * @tsp: blob to initialize | |
1a28979b LP |
322 | * @task: a pointer to the Smack label for the running task |
323 | * @forked: a pointer to the Smack label for the forked task | |
7898e1f8 | 324 | * |
7898e1f8 | 325 | */ |
bbd3662a CS |
326 | static void init_task_smack(struct task_smack *tsp, struct smack_known *task, |
327 | struct smack_known *forked) | |
7898e1f8 | 328 | { |
7898e1f8 CS |
329 | tsp->smk_task = task; |
330 | tsp->smk_forked = forked; | |
331 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 332 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 | 333 | mutex_init(&tsp->smk_rules_lock); |
7898e1f8 CS |
334 | } |
335 | ||
336 | /** | |
337 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
338 | * @nhead: new rules header pointer |
339 | * @ohead: old rules header pointer | |
340 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
341 | * |
342 | * Returns 0 on success, -ENOMEM on error | |
343 | */ | |
344 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
345 | gfp_t gfp) | |
346 | { | |
347 | struct smack_rule *nrp; | |
348 | struct smack_rule *orp; | |
349 | int rc = 0; | |
350 | ||
7898e1f8 | 351 | list_for_each_entry_rcu(orp, ohead, list) { |
4e328b08 | 352 | nrp = kmem_cache_zalloc(smack_rule_cache, gfp); |
7898e1f8 CS |
353 | if (nrp == NULL) { |
354 | rc = -ENOMEM; | |
355 | break; | |
356 | } | |
357 | *nrp = *orp; | |
358 | list_add_rcu(&nrp->list, nhead); | |
359 | } | |
360 | return rc; | |
361 | } | |
362 | ||
38416e53 ZJ |
363 | /** |
364 | * smk_copy_relabel - copy smk_relabel labels list | |
365 | * @nhead: new rules header pointer | |
366 | * @ohead: old rules header pointer | |
367 | * @gfp: type of the memory for the allocation | |
368 | * | |
369 | * Returns 0 on success, -ENOMEM on error | |
370 | */ | |
371 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
372 | gfp_t gfp) | |
373 | { | |
374 | struct smack_known_list_elem *nklep; | |
375 | struct smack_known_list_elem *oklep; | |
376 | ||
38416e53 ZJ |
377 | list_for_each_entry(oklep, ohead, list) { |
378 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
379 | if (nklep == NULL) { | |
380 | smk_destroy_label_list(nhead); | |
381 | return -ENOMEM; | |
382 | } | |
383 | nklep->smk_label = oklep->smk_label; | |
384 | list_add(&nklep->list, nhead); | |
385 | } | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
5663884c LP |
390 | /** |
391 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
392 | * @mode - input mode in form of PTRACE_MODE_* | |
393 | * | |
394 | * Returns a converted MAY_* mode usable by smack rules | |
395 | */ | |
396 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
397 | { | |
3dfb7d8c | 398 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 399 | return MAY_READWRITE; |
3dfb7d8c JH |
400 | if (mode & PTRACE_MODE_READ) |
401 | return MAY_READ; | |
5663884c LP |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
406 | /** | |
407 | * smk_ptrace_rule_check - helper for ptrace access | |
408 | * @tracer: tracer process | |
21c7eae2 | 409 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
410 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
411 | * @func: name of the function that called us, used for audit | |
412 | * | |
413 | * Returns 0 on access granted, -error on error | |
414 | */ | |
21c7eae2 LP |
415 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
416 | struct smack_known *tracee_known, | |
5663884c LP |
417 | unsigned int mode, const char *func) |
418 | { | |
419 | int rc; | |
420 | struct smk_audit_info ad, *saip = NULL; | |
421 | struct task_smack *tsp; | |
21c7eae2 | 422 | struct smack_known *tracer_known; |
dcb569cf | 423 | const struct cred *tracercred; |
5663884c LP |
424 | |
425 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
426 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
427 | smk_ad_setfield_u_tsk(&ad, tracer); | |
428 | saip = &ad; | |
429 | } | |
430 | ||
6d1cff2a | 431 | rcu_read_lock(); |
dcb569cf | 432 | tracercred = __task_cred(tracer); |
b17103a8 | 433 | tsp = smack_cred(tracercred); |
21c7eae2 | 434 | tracer_known = smk_of_task(tsp); |
5663884c | 435 | |
66867818 LP |
436 | if ((mode & PTRACE_MODE_ATTACH) && |
437 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
438 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 439 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
440 | rc = 0; |
441 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
442 | rc = -EACCES; | |
dcb569cf | 443 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
444 | rc = 0; |
445 | else | |
446 | rc = -EACCES; | |
447 | ||
448 | if (saip) | |
21c7eae2 LP |
449 | smack_log(tracer_known->smk_known, |
450 | tracee_known->smk_known, | |
451 | 0, rc, saip); | |
66867818 | 452 | |
6d1cff2a | 453 | rcu_read_unlock(); |
66867818 LP |
454 | return rc; |
455 | } | |
456 | ||
457 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 458 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
459 | |
460 | rcu_read_unlock(); | |
5663884c LP |
461 | return rc; |
462 | } | |
463 | ||
e114e473 CS |
464 | /* |
465 | * LSM hooks. | |
466 | * We he, that is fun! | |
467 | */ | |
468 | ||
469 | /** | |
9e48858f | 470 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 471 | * @ctp: child task pointer |
5663884c | 472 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
473 | * |
474 | * Returns 0 if access is OK, an error code otherwise | |
475 | * | |
5663884c | 476 | * Do the capability checks. |
e114e473 | 477 | */ |
9e48858f | 478 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 479 | { |
2f823ff8 | 480 | struct smack_known *skp; |
e114e473 | 481 | |
1fb057dc | 482 | skp = smk_of_task_struct_obj(ctp); |
ecfcc53f | 483 | |
b1d9e6b0 | 484 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
485 | } |
486 | ||
487 | /** | |
488 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
489 | * @ptp: parent task pointer | |
490 | * | |
491 | * Returns 0 if access is OK, an error code otherwise | |
492 | * | |
5663884c | 493 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
494 | */ |
495 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
496 | { | |
497 | int rc; | |
2f823ff8 | 498 | struct smack_known *skp; |
5cd9c58f | 499 | |
b17103a8 | 500 | skp = smk_of_task(smack_cred(current_cred())); |
ecfcc53f | 501 | |
21c7eae2 | 502 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
503 | return rc; |
504 | } | |
505 | ||
506 | /** | |
507 | * smack_syslog - Smack approval on syslog | |
a1a07f22 | 508 | * @typefrom_file: unused |
e114e473 | 509 | * |
e114e473 CS |
510 | * Returns 0 on success, error code otherwise. |
511 | */ | |
12b3052c | 512 | static int smack_syslog(int typefrom_file) |
e114e473 | 513 | { |
12b3052c | 514 | int rc = 0; |
2f823ff8 | 515 | struct smack_known *skp = smk_of_current(); |
e114e473 | 516 | |
1880eff7 | 517 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
518 | return 0; |
519 | ||
24ea1b6e | 520 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
521 | rc = -EACCES; |
522 | ||
523 | return rc; | |
524 | } | |
525 | ||
e114e473 CS |
526 | /* |
527 | * Superblock Hooks. | |
528 | */ | |
529 | ||
530 | /** | |
531 | * smack_sb_alloc_security - allocate a superblock blob | |
532 | * @sb: the superblock getting the blob | |
533 | * | |
534 | * Returns 0 on success or -ENOMEM on error. | |
535 | */ | |
536 | static int smack_sb_alloc_security(struct super_block *sb) | |
537 | { | |
1aea7808 | 538 | struct superblock_smack *sbsp = smack_superblock(sb); |
e114e473 | 539 | |
21c7eae2 LP |
540 | sbsp->smk_root = &smack_known_floor; |
541 | sbsp->smk_default = &smack_known_floor; | |
542 | sbsp->smk_floor = &smack_known_floor; | |
543 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 544 | /* |
9f50eda2 | 545 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 546 | */ |
e114e473 CS |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
12085b14 AV |
551 | struct smack_mnt_opts { |
552 | const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute; | |
553 | }; | |
e114e473 | 554 | |
204cc0cc AV |
555 | static void smack_free_mnt_opts(void *mnt_opts) |
556 | { | |
12085b14 AV |
557 | struct smack_mnt_opts *opts = mnt_opts; |
558 | kfree(opts->fsdefault); | |
559 | kfree(opts->fsfloor); | |
560 | kfree(opts->fshat); | |
561 | kfree(opts->fsroot); | |
562 | kfree(opts->fstransmute); | |
204cc0cc AV |
563 | kfree(opts); |
564 | } | |
e114e473 | 565 | |
55c0e5bd AV |
566 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
567 | { | |
568 | struct smack_mnt_opts *opts = *mnt_opts; | |
e114e473 | 569 | |
55c0e5bd AV |
570 | if (!opts) { |
571 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
572 | if (!opts) | |
573 | return -ENOMEM; | |
574 | *mnt_opts = opts; | |
e114e473 | 575 | } |
55c0e5bd AV |
576 | if (!s) |
577 | return -ENOMEM; | |
e114e473 | 578 | |
55c0e5bd AV |
579 | switch (token) { |
580 | case Opt_fsdefault: | |
581 | if (opts->fsdefault) | |
582 | goto out_opt_err; | |
583 | opts->fsdefault = s; | |
584 | break; | |
585 | case Opt_fsfloor: | |
586 | if (opts->fsfloor) | |
587 | goto out_opt_err; | |
588 | opts->fsfloor = s; | |
589 | break; | |
590 | case Opt_fshat: | |
591 | if (opts->fshat) | |
592 | goto out_opt_err; | |
593 | opts->fshat = s; | |
594 | break; | |
595 | case Opt_fsroot: | |
596 | if (opts->fsroot) | |
597 | goto out_opt_err; | |
598 | opts->fsroot = s; | |
599 | break; | |
600 | case Opt_fstransmute: | |
601 | if (opts->fstransmute) | |
602 | goto out_opt_err; | |
603 | opts->fstransmute = s; | |
604 | break; | |
605 | } | |
e114e473 | 606 | return 0; |
55c0e5bd AV |
607 | |
608 | out_opt_err: | |
609 | pr_warn("Smack: duplicate mount options\n"); | |
610 | return -EINVAL; | |
e114e473 CS |
611 | } |
612 | ||
0b52075e AV |
613 | /** |
614 | * smack_fs_context_dup - Duplicate the security data on fs_context duplication | |
615 | * @fc: The new filesystem context. | |
616 | * @src_fc: The source filesystem context being duplicated. | |
617 | * | |
618 | * Returns 0 on success or -ENOMEM on error. | |
619 | */ | |
620 | static int smack_fs_context_dup(struct fs_context *fc, | |
621 | struct fs_context *src_fc) | |
622 | { | |
623 | struct smack_mnt_opts *dst, *src = src_fc->security; | |
624 | ||
625 | if (!src) | |
626 | return 0; | |
627 | ||
628 | fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
629 | if (!fc->security) | |
630 | return -ENOMEM; | |
631 | dst = fc->security; | |
632 | ||
633 | if (src->fsdefault) { | |
634 | dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL); | |
635 | if (!dst->fsdefault) | |
636 | return -ENOMEM; | |
637 | } | |
638 | if (src->fsfloor) { | |
639 | dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL); | |
640 | if (!dst->fsfloor) | |
641 | return -ENOMEM; | |
642 | } | |
643 | if (src->fshat) { | |
644 | dst->fshat = kstrdup(src->fshat, GFP_KERNEL); | |
645 | if (!dst->fshat) | |
646 | return -ENOMEM; | |
647 | } | |
648 | if (src->fsroot) { | |
649 | dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL); | |
650 | if (!dst->fsroot) | |
651 | return -ENOMEM; | |
652 | } | |
653 | if (src->fstransmute) { | |
654 | dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL); | |
655 | if (!dst->fstransmute) | |
656 | return -ENOMEM; | |
657 | } | |
658 | return 0; | |
659 | } | |
660 | ||
d7167b14 | 661 | static const struct fs_parameter_spec smack_fs_parameters[] = { |
6e7739fc CS |
662 | fsparam_string("smackfsdef", Opt_fsdefault), |
663 | fsparam_string("smackfsdefault", Opt_fsdefault), | |
664 | fsparam_string("smackfsfloor", Opt_fsfloor), | |
665 | fsparam_string("smackfshat", Opt_fshat), | |
666 | fsparam_string("smackfsroot", Opt_fsroot), | |
667 | fsparam_string("smackfstransmute", Opt_fstransmute), | |
2febd254 DH |
668 | {} |
669 | }; | |
670 | ||
2febd254 DH |
671 | /** |
672 | * smack_fs_context_parse_param - Parse a single mount parameter | |
673 | * @fc: The new filesystem context being constructed. | |
674 | * @param: The parameter. | |
675 | * | |
676 | * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on | |
677 | * error. | |
678 | */ | |
679 | static int smack_fs_context_parse_param(struct fs_context *fc, | |
680 | struct fs_parameter *param) | |
681 | { | |
682 | struct fs_parse_result result; | |
683 | int opt, rc; | |
684 | ||
d7167b14 | 685 | opt = fs_parse(fc, smack_fs_parameters, param, &result); |
2febd254 DH |
686 | if (opt < 0) |
687 | return opt; | |
688 | ||
689 | rc = smack_add_opt(opt, param->string, &fc->security); | |
690 | if (!rc) | |
691 | param->string = NULL; | |
692 | return rc; | |
693 | } | |
694 | ||
d2497e12 | 695 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
3bf2789c | 696 | { |
d2497e12 AV |
697 | char *from = options, *to = options; |
698 | bool first = true; | |
3bf2789c | 699 | |
c3300aaf AV |
700 | while (1) { |
701 | char *next = strchr(from, ','); | |
702 | int token, len, rc; | |
703 | char *arg = NULL; | |
3bf2789c | 704 | |
c3300aaf AV |
705 | if (next) |
706 | len = next - from; | |
707 | else | |
708 | len = strlen(from); | |
3bf2789c | 709 | |
c3300aaf | 710 | token = match_opt_prefix(from, len, &arg); |
d2497e12 AV |
711 | if (token != Opt_error) { |
712 | arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL); | |
713 | rc = smack_add_opt(token, arg, mnt_opts); | |
714 | if (unlikely(rc)) { | |
715 | kfree(arg); | |
716 | if (*mnt_opts) | |
717 | smack_free_mnt_opts(*mnt_opts); | |
718 | *mnt_opts = NULL; | |
719 | return rc; | |
720 | } | |
721 | } else { | |
722 | if (!first) { // copy with preceding comma | |
723 | from--; | |
724 | len++; | |
725 | } | |
726 | if (to != from) | |
727 | memmove(to, from, len); | |
728 | to += len; | |
729 | first = false; | |
3bf2789c | 730 | } |
c3300aaf AV |
731 | if (!from[len]) |
732 | break; | |
733 | from += len + 1; | |
3bf2789c | 734 | } |
d2497e12 | 735 | *to = '\0'; |
3bf2789c | 736 | return 0; |
3bf2789c VT |
737 | } |
738 | ||
739 | /** | |
740 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 741 | * @sb: the file system superblock |
a1a07f22 | 742 | * @mnt_opts: Smack mount options |
3bf2789c VT |
743 | * @kern_flags: mount option from kernel space or user space |
744 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
745 | * |
746 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
747 | * |
748 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
749 | * labels. | |
e114e473 | 750 | */ |
3bf2789c | 751 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 752 | void *mnt_opts, |
3bf2789c VT |
753 | unsigned long kern_flags, |
754 | unsigned long *set_kern_flags) | |
e114e473 CS |
755 | { |
756 | struct dentry *root = sb->s_root; | |
c6f493d6 | 757 | struct inode *inode = d_backing_inode(root); |
1aea7808 | 758 | struct superblock_smack *sp = smack_superblock(sb); |
e114e473 | 759 | struct inode_smack *isp; |
24ea1b6e | 760 | struct smack_known *skp; |
12085b14 AV |
761 | struct smack_mnt_opts *opts = mnt_opts; |
762 | bool transmute = false; | |
e114e473 | 763 | |
9f50eda2 | 764 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 765 | return 0; |
eb982cb4 | 766 | |
afb1cbe3 CS |
767 | if (inode->i_security == NULL) { |
768 | int rc = lsm_inode_alloc(inode); | |
769 | ||
770 | if (rc) | |
771 | return rc; | |
772 | } | |
773 | ||
2097f599 HS |
774 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
775 | /* | |
776 | * Unprivileged mounts don't get to specify Smack values. | |
777 | */ | |
12085b14 | 778 | if (opts) |
2097f599 HS |
779 | return -EPERM; |
780 | /* | |
781 | * Unprivileged mounts get root and default from the caller. | |
782 | */ | |
783 | skp = smk_of_current(); | |
784 | sp->smk_root = skp; | |
785 | sp->smk_default = skp; | |
786 | /* | |
787 | * For a handful of fs types with no user-controlled | |
788 | * backing store it's okay to trust security labels | |
789 | * in the filesystem. The rest are untrusted. | |
790 | */ | |
791 | if (sb->s_user_ns != &init_user_ns && | |
792 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
793 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 794 | transmute = true; |
2097f599 HS |
795 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
796 | } | |
797 | } | |
798 | ||
9f50eda2 | 799 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 800 | |
12085b14 AV |
801 | if (opts) { |
802 | if (opts->fsdefault) { | |
803 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
804 | if (IS_ERR(skp)) |
805 | return PTR_ERR(skp); | |
3bf2789c | 806 | sp->smk_default = skp; |
12085b14 AV |
807 | } |
808 | if (opts->fsfloor) { | |
809 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
810 | if (IS_ERR(skp)) |
811 | return PTR_ERR(skp); | |
812 | sp->smk_floor = skp; | |
12085b14 AV |
813 | } |
814 | if (opts->fshat) { | |
815 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
816 | if (IS_ERR(skp)) |
817 | return PTR_ERR(skp); | |
3bf2789c | 818 | sp->smk_hat = skp; |
12085b14 AV |
819 | } |
820 | if (opts->fsroot) { | |
821 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
822 | if (IS_ERR(skp)) |
823 | return PTR_ERR(skp); | |
824 | sp->smk_root = skp; | |
12085b14 AV |
825 | } |
826 | if (opts->fstransmute) { | |
827 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
828 | if (IS_ERR(skp)) |
829 | return PTR_ERR(skp); | |
830 | sp->smk_root = skp; | |
12085b14 | 831 | transmute = true; |
e114e473 CS |
832 | } |
833 | } | |
834 | ||
835 | /* | |
836 | * Initialize the root inode. | |
837 | */ | |
afb1cbe3 | 838 | init_inode_smack(inode, sp->smk_root); |
e114e473 | 839 | |
afb1cbe3 CS |
840 | if (transmute) { |
841 | isp = smack_inode(inode); | |
e830b394 | 842 | isp->smk_flags |= SMK_INODE_TRANSMUTE; |
afb1cbe3 | 843 | } |
e830b394 | 844 | |
e114e473 CS |
845 | return 0; |
846 | } | |
847 | ||
848 | /** | |
849 | * smack_sb_statfs - Smack check on statfs | |
850 | * @dentry: identifies the file system in question | |
851 | * | |
852 | * Returns 0 if current can read the floor of the filesystem, | |
853 | * and error code otherwise | |
854 | */ | |
855 | static int smack_sb_statfs(struct dentry *dentry) | |
856 | { | |
1aea7808 | 857 | struct superblock_smack *sbp = smack_superblock(dentry->d_sb); |
ecfcc53f EB |
858 | int rc; |
859 | struct smk_audit_info ad; | |
860 | ||
a269434d | 861 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 862 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 863 | |
ecfcc53f | 864 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 865 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 866 | return rc; |
e114e473 CS |
867 | } |
868 | ||
676dac4b CS |
869 | /* |
870 | * BPRM hooks | |
871 | */ | |
872 | ||
ce8a4321 | 873 | /** |
b8bff599 | 874 | * smack_bprm_creds_for_exec - Update bprm->cred if needed for exec |
ce8a4321 CS |
875 | * @bprm: the exec information |
876 | * | |
5663884c | 877 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 878 | */ |
b8bff599 | 879 | static int smack_bprm_creds_for_exec(struct linux_binprm *bprm) |
676dac4b | 880 | { |
496ad9aa | 881 | struct inode *inode = file_inode(bprm->file); |
b17103a8 | 882 | struct task_smack *bsp = smack_cred(bprm->cred); |
676dac4b | 883 | struct inode_smack *isp; |
809c02e0 | 884 | struct superblock_smack *sbsp; |
676dac4b CS |
885 | int rc; |
886 | ||
fb4021b6 | 887 | isp = smack_inode(inode); |
84088ba2 | 888 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) |
676dac4b CS |
889 | return 0; |
890 | ||
1aea7808 | 891 | sbsp = smack_superblock(inode->i_sb); |
809c02e0 SF |
892 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && |
893 | isp->smk_task != sbsp->smk_root) | |
894 | return 0; | |
895 | ||
9227dd2a | 896 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
897 | struct task_struct *tracer; |
898 | rc = 0; | |
899 | ||
900 | rcu_read_lock(); | |
901 | tracer = ptrace_parent(current); | |
902 | if (likely(tracer != NULL)) | |
903 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 904 | isp->smk_task, |
5663884c LP |
905 | PTRACE_MODE_ATTACH, |
906 | __func__); | |
907 | rcu_read_unlock(); | |
908 | ||
909 | if (rc != 0) | |
910 | return rc; | |
3675f052 JH |
911 | } |
912 | if (bprm->unsafe & ~LSM_UNSAFE_PTRACE) | |
84088ba2 | 913 | return -EPERM; |
676dac4b | 914 | |
84088ba2 JS |
915 | bsp->smk_task = isp->smk_task; |
916 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 917 | |
ccbb6e10 KC |
918 | /* Decide if this is a secure exec. */ |
919 | if (bsp->smk_task != bsp->smk_forked) | |
920 | bprm->secureexec = 1; | |
921 | ||
84088ba2 JS |
922 | return 0; |
923 | } | |
676dac4b | 924 | |
e114e473 CS |
925 | /* |
926 | * Inode hooks | |
927 | */ | |
928 | ||
929 | /** | |
930 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 931 | * @inode: the inode in need of a blob |
e114e473 | 932 | * |
a1a07f22 | 933 | * Returns 0 |
e114e473 CS |
934 | */ |
935 | static int smack_inode_alloc_security(struct inode *inode) | |
936 | { | |
2f823ff8 CS |
937 | struct smack_known *skp = smk_of_current(); |
938 | ||
afb1cbe3 | 939 | init_inode_smack(inode, skp); |
e114e473 CS |
940 | return 0; |
941 | } | |
942 | ||
e114e473 CS |
943 | /** |
944 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
945 | * @inode: the newly created inode |
946 | * @dir: containing directory object | |
2a7dba39 | 947 | * @qstr: unused |
e114e473 CS |
948 | * @name: where to put the attribute name |
949 | * @value: where to put the attribute value | |
950 | * @len: where to put the length of the attribute | |
951 | * | |
952 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
953 | */ | |
954 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 955 | const struct qstr *qstr, const char **name, |
2a7dba39 | 956 | void **value, size_t *len) |
e114e473 | 957 | { |
fb4021b6 | 958 | struct inode_smack *issp = smack_inode(inode); |
2f823ff8 | 959 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
960 | struct smack_known *isp = smk_of_inode(inode); |
961 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 962 | int may; |
e114e473 | 963 | |
9548906b TH |
964 | if (name) |
965 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 966 | |
68390ccf | 967 | if (value && len) { |
7898e1f8 | 968 | rcu_read_lock(); |
21c7eae2 LP |
969 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
970 | &skp->smk_rules); | |
7898e1f8 | 971 | rcu_read_unlock(); |
5c6d1125 JS |
972 | |
973 | /* | |
974 | * If the access rule allows transmutation and | |
975 | * the directory requests transmutation then | |
976 | * by all means transmute. | |
2267b13a | 977 | * Mark the inode as changed. |
5c6d1125 | 978 | */ |
7898e1f8 | 979 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 980 | smk_inode_transmutable(dir)) { |
5c6d1125 | 981 | isp = dsp; |
2267b13a CS |
982 | issp->smk_flags |= SMK_INODE_CHANGED; |
983 | } | |
5c6d1125 | 984 | |
21c7eae2 | 985 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
986 | if (*value == NULL) |
987 | return -ENOMEM; | |
e114e473 | 988 | |
21c7eae2 | 989 | *len = strlen(isp->smk_known); |
68390ccf | 990 | } |
e114e473 CS |
991 | |
992 | return 0; | |
993 | } | |
994 | ||
995 | /** | |
996 | * smack_inode_link - Smack check on link | |
997 | * @old_dentry: the existing object | |
998 | * @dir: unused | |
999 | * @new_dentry: the new object | |
1000 | * | |
1001 | * Returns 0 if access is permitted, an error code otherwise | |
1002 | */ | |
1003 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1004 | struct dentry *new_dentry) | |
1005 | { | |
21c7eae2 | 1006 | struct smack_known *isp; |
ecfcc53f EB |
1007 | struct smk_audit_info ad; |
1008 | int rc; | |
1009 | ||
a269434d | 1010 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1011 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1012 | |
c6f493d6 | 1013 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1014 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1015 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1016 | |
8802565b | 1017 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1018 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1019 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1020 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1021 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1022 | } |
1023 | ||
1024 | return rc; | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * smack_inode_unlink - Smack check on inode deletion | |
1029 | * @dir: containing directory object | |
1030 | * @dentry: file to unlink | |
1031 | * | |
1032 | * Returns 0 if current can write the containing directory | |
1033 | * and the object, error code otherwise | |
1034 | */ | |
1035 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1036 | { | |
c6f493d6 | 1037 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1038 | struct smk_audit_info ad; |
e114e473 CS |
1039 | int rc; |
1040 | ||
a269434d | 1041 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1042 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1043 | ||
e114e473 CS |
1044 | /* |
1045 | * You need write access to the thing you're unlinking | |
1046 | */ | |
ecfcc53f | 1047 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1048 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1049 | if (rc == 0) { |
e114e473 CS |
1050 | /* |
1051 | * You also need write access to the containing directory | |
1052 | */ | |
cdb56b60 | 1053 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1054 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1055 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1056 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1057 | } |
e114e473 CS |
1058 | return rc; |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * smack_inode_rmdir - Smack check on directory deletion | |
1063 | * @dir: containing directory object | |
1064 | * @dentry: directory to unlink | |
1065 | * | |
1066 | * Returns 0 if current can write the containing directory | |
1067 | * and the directory, error code otherwise | |
1068 | */ | |
1069 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1070 | { | |
ecfcc53f | 1071 | struct smk_audit_info ad; |
e114e473 CS |
1072 | int rc; |
1073 | ||
a269434d | 1074 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1075 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1076 | ||
e114e473 CS |
1077 | /* |
1078 | * You need write access to the thing you're removing | |
1079 | */ | |
c6f493d6 DH |
1080 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1081 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1082 | if (rc == 0) { |
e114e473 CS |
1083 | /* |
1084 | * You also need write access to the containing directory | |
1085 | */ | |
cdb56b60 | 1086 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1087 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1088 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1089 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1090 | } |
e114e473 CS |
1091 | |
1092 | return rc; | |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1097 | * @old_inode: unused |
1098 | * @old_dentry: the old object | |
1099 | * @new_inode: unused | |
1100 | * @new_dentry: the new object | |
e114e473 CS |
1101 | * |
1102 | * Read and write access is required on both the old and | |
1103 | * new directories. | |
1104 | * | |
1105 | * Returns 0 if access is permitted, an error code otherwise | |
1106 | */ | |
1107 | static int smack_inode_rename(struct inode *old_inode, | |
1108 | struct dentry *old_dentry, | |
1109 | struct inode *new_inode, | |
1110 | struct dentry *new_dentry) | |
1111 | { | |
1112 | int rc; | |
21c7eae2 | 1113 | struct smack_known *isp; |
ecfcc53f EB |
1114 | struct smk_audit_info ad; |
1115 | ||
a269434d | 1116 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1117 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1118 | |
c6f493d6 | 1119 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1120 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1121 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1122 | |
8802565b | 1123 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1124 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1125 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1126 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1127 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1128 | } |
e114e473 CS |
1129 | return rc; |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * smack_inode_permission - Smack version of permission() | |
1134 | * @inode: the inode in question | |
1135 | * @mask: the access requested | |
e114e473 CS |
1136 | * |
1137 | * This is the important Smack hook. | |
1138 | * | |
a1a07f22 | 1139 | * Returns 0 if access is permitted, an error code otherwise |
e114e473 | 1140 | */ |
e74f71eb | 1141 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1142 | { |
1aea7808 | 1143 | struct superblock_smack *sbsp = smack_superblock(inode->i_sb); |
ecfcc53f | 1144 | struct smk_audit_info ad; |
e74f71eb | 1145 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1146 | int rc; |
d09ca739 EP |
1147 | |
1148 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1149 | /* |
1150 | * No permission to check. Existence test. Yup, it's there. | |
1151 | */ | |
1152 | if (mask == 0) | |
1153 | return 0; | |
8c9e80ed | 1154 | |
9f50eda2 SF |
1155 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1156 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1157 | return -EACCES; | |
1158 | } | |
1159 | ||
8c9e80ed | 1160 | /* May be droppable after audit */ |
e74f71eb | 1161 | if (no_block) |
8c9e80ed | 1162 | return -ECHILD; |
f48b7399 | 1163 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1164 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1165 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1166 | rc = smk_bu_inode(inode, mask, rc); | |
1167 | return rc; | |
e114e473 CS |
1168 | } |
1169 | ||
1170 | /** | |
1171 | * smack_inode_setattr - Smack check for setting attributes | |
1172 | * @dentry: the object | |
1173 | * @iattr: for the force flag | |
1174 | * | |
1175 | * Returns 0 if access is permitted, an error code otherwise | |
1176 | */ | |
1177 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1178 | { | |
ecfcc53f | 1179 | struct smk_audit_info ad; |
d166c802 CS |
1180 | int rc; |
1181 | ||
e114e473 CS |
1182 | /* |
1183 | * Need to allow for clearing the setuid bit. | |
1184 | */ | |
1185 | if (iattr->ia_valid & ATTR_FORCE) | |
1186 | return 0; | |
a269434d | 1187 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1188 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1189 | |
c6f493d6 DH |
1190 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1191 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1192 | return rc; |
e114e473 CS |
1193 | } |
1194 | ||
1195 | /** | |
1196 | * smack_inode_getattr - Smack check for getting attributes | |
a1a07f22 | 1197 | * @path: path to extract the info from |
e114e473 CS |
1198 | * |
1199 | * Returns 0 if access is permitted, an error code otherwise | |
1200 | */ | |
3f7036a0 | 1201 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1202 | { |
ecfcc53f | 1203 | struct smk_audit_info ad; |
c6f493d6 | 1204 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1205 | int rc; |
ecfcc53f | 1206 | |
f48b7399 | 1207 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1208 | smk_ad_setfield_u_fs_path(&ad, *path); |
1209 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1210 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1211 | return rc; |
e114e473 CS |
1212 | } |
1213 | ||
1214 | /** | |
1215 | * smack_inode_setxattr - Smack check for setting xattrs | |
1216 | * @dentry: the object | |
1217 | * @name: name of the attribute | |
e95ef49b LP |
1218 | * @value: value of the attribute |
1219 | * @size: size of the value | |
e114e473 CS |
1220 | * @flags: unused |
1221 | * | |
1222 | * This protects the Smack attribute explicitly. | |
1223 | * | |
1224 | * Returns 0 if access is permitted, an error code otherwise | |
1225 | */ | |
71bc356f CB |
1226 | static int smack_inode_setxattr(struct user_namespace *mnt_userns, |
1227 | struct dentry *dentry, const char *name, | |
8f0cfa52 | 1228 | const void *value, size_t size, int flags) |
e114e473 | 1229 | { |
ecfcc53f | 1230 | struct smk_audit_info ad; |
19760ad0 CS |
1231 | struct smack_known *skp; |
1232 | int check_priv = 0; | |
1233 | int check_import = 0; | |
1234 | int check_star = 0; | |
bcdca225 | 1235 | int rc = 0; |
e114e473 | 1236 | |
19760ad0 CS |
1237 | /* |
1238 | * Check label validity here so import won't fail in post_setxattr | |
1239 | */ | |
bcdca225 CS |
1240 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1241 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1242 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1243 | check_priv = 1; | |
1244 | check_import = 1; | |
1245 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1246 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1247 | check_priv = 1; | |
1248 | check_import = 1; | |
1249 | check_star = 1; | |
5c6d1125 | 1250 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1251 | check_priv = 1; |
5c6d1125 JS |
1252 | if (size != TRANS_TRUE_SIZE || |
1253 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1254 | rc = -EINVAL; | |
bcdca225 CS |
1255 | } else |
1256 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1257 | ||
19760ad0 CS |
1258 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1259 | rc = -EPERM; | |
1260 | ||
1261 | if (rc == 0 && check_import) { | |
b862e561 | 1262 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1263 | if (IS_ERR(skp)) |
1264 | rc = PTR_ERR(skp); | |
1265 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1266 | (skp == &smack_known_star || skp == &smack_known_web))) |
1267 | rc = -EINVAL; | |
1268 | } | |
1269 | ||
a269434d | 1270 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1271 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1272 | ||
d166c802 | 1273 | if (rc == 0) { |
c6f493d6 DH |
1274 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1275 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1276 | } |
bcdca225 CS |
1277 | |
1278 | return rc; | |
e114e473 CS |
1279 | } |
1280 | ||
1281 | /** | |
1282 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1283 | * @dentry: object | |
1284 | * @name: attribute name | |
1285 | * @value: attribute value | |
1286 | * @size: attribute size | |
1287 | * @flags: unused | |
1288 | * | |
1289 | * Set the pointer in the inode blob to the entry found | |
1290 | * in the master label list. | |
1291 | */ | |
8f0cfa52 DH |
1292 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1293 | const void *value, size_t size, int flags) | |
e114e473 | 1294 | { |
2f823ff8 | 1295 | struct smack_known *skp; |
fb4021b6 | 1296 | struct inode_smack *isp = smack_inode(d_backing_inode(dentry)); |
676dac4b | 1297 | |
2f823ff8 CS |
1298 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1299 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1300 | return; | |
1301 | } | |
1302 | ||
676dac4b | 1303 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1304 | skp = smk_import_entry(value, size); |
e774ad68 | 1305 | if (!IS_ERR(skp)) |
21c7eae2 | 1306 | isp->smk_inode = skp; |
5c6d1125 | 1307 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1308 | skp = smk_import_entry(value, size); |
e774ad68 | 1309 | if (!IS_ERR(skp)) |
2f823ff8 | 1310 | isp->smk_task = skp; |
7898e1f8 | 1311 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1312 | skp = smk_import_entry(value, size); |
e774ad68 | 1313 | if (!IS_ERR(skp)) |
2f823ff8 | 1314 | isp->smk_mmap = skp; |
2f823ff8 | 1315 | } |
e114e473 CS |
1316 | |
1317 | return; | |
1318 | } | |
1319 | ||
ce8a4321 | 1320 | /** |
e114e473 CS |
1321 | * smack_inode_getxattr - Smack check on getxattr |
1322 | * @dentry: the object | |
1323 | * @name: unused | |
1324 | * | |
1325 | * Returns 0 if access is permitted, an error code otherwise | |
1326 | */ | |
8f0cfa52 | 1327 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1328 | { |
ecfcc53f | 1329 | struct smk_audit_info ad; |
d166c802 | 1330 | int rc; |
ecfcc53f | 1331 | |
a269434d | 1332 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1333 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1334 | ||
c6f493d6 DH |
1335 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1336 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1337 | return rc; |
e114e473 CS |
1338 | } |
1339 | ||
ce8a4321 | 1340 | /** |
e114e473 CS |
1341 | * smack_inode_removexattr - Smack check on removexattr |
1342 | * @dentry: the object | |
1343 | * @name: name of the attribute | |
1344 | * | |
1345 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1346 | * | |
1347 | * Returns 0 if access is permitted, an error code otherwise | |
1348 | */ | |
71bc356f CB |
1349 | static int smack_inode_removexattr(struct user_namespace *mnt_userns, |
1350 | struct dentry *dentry, const char *name) | |
e114e473 | 1351 | { |
676dac4b | 1352 | struct inode_smack *isp; |
ecfcc53f | 1353 | struct smk_audit_info ad; |
bcdca225 | 1354 | int rc = 0; |
e114e473 | 1355 | |
bcdca225 CS |
1356 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1357 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1358 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1359 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1360 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1361 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1362 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1363 | rc = -EPERM; |
1364 | } else | |
71bc356f | 1365 | rc = cap_inode_removexattr(mnt_userns, dentry, name); |
bcdca225 | 1366 | |
f59bdfba CS |
1367 | if (rc != 0) |
1368 | return rc; | |
1369 | ||
a269434d | 1370 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1371 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1372 | |
c6f493d6 DH |
1373 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1374 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1375 | if (rc != 0) |
1376 | return rc; | |
1377 | ||
fb4021b6 | 1378 | isp = smack_inode(d_backing_inode(dentry)); |
f59bdfba CS |
1379 | /* |
1380 | * Don't do anything special for these. | |
1381 | * XATTR_NAME_SMACKIPIN | |
1382 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1383 | */ |
8012495e | 1384 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1385 | struct super_block *sbp = dentry->d_sb; |
1aea7808 | 1386 | struct superblock_smack *sbsp = smack_superblock(sbp); |
8012495e JB |
1387 | |
1388 | isp->smk_inode = sbsp->smk_default; | |
1389 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1390 | isp->smk_task = NULL; |
f59bdfba | 1391 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1392 | isp->smk_mmap = NULL; |
f59bdfba CS |
1393 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1394 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1395 | |
f59bdfba | 1396 | return 0; |
e114e473 CS |
1397 | } |
1398 | ||
1399 | /** | |
1400 | * smack_inode_getsecurity - get smack xattrs | |
1401 | * @inode: the object | |
1402 | * @name: attribute name | |
1403 | * @buffer: where to put the result | |
57e7ba04 | 1404 | * @alloc: duplicate memory |
e114e473 CS |
1405 | * |
1406 | * Returns the size of the attribute or an error code | |
1407 | */ | |
71bc356f CB |
1408 | static int smack_inode_getsecurity(struct user_namespace *mnt_userns, |
1409 | struct inode *inode, const char *name, | |
1410 | void **buffer, bool alloc) | |
e114e473 CS |
1411 | { |
1412 | struct socket_smack *ssp; | |
1413 | struct socket *sock; | |
1414 | struct super_block *sbp; | |
1415 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1416 | struct smack_known *isp; |
e114e473 | 1417 | |
57e7ba04 | 1418 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1419 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1420 | else { |
1421 | /* | |
1422 | * The rest of the Smack xattrs are only on sockets. | |
1423 | */ | |
1424 | sbp = ip->i_sb; | |
1425 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1426 | return -EOPNOTSUPP; | |
e114e473 | 1427 | |
57e7ba04 CS |
1428 | sock = SOCKET_I(ip); |
1429 | if (sock == NULL || sock->sk == NULL) | |
1430 | return -EOPNOTSUPP; | |
e114e473 | 1431 | |
12ddb08a | 1432 | ssp = smack_sock(sock->sk); |
e114e473 | 1433 | |
57e7ba04 CS |
1434 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1435 | isp = ssp->smk_in; | |
1436 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1437 | isp = ssp->smk_out; | |
1438 | else | |
1439 | return -EOPNOTSUPP; | |
1440 | } | |
e114e473 | 1441 | |
57e7ba04 CS |
1442 | if (alloc) { |
1443 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1444 | if (*buffer == NULL) | |
1445 | return -ENOMEM; | |
e114e473 CS |
1446 | } |
1447 | ||
57e7ba04 | 1448 | return strlen(isp->smk_known); |
e114e473 CS |
1449 | } |
1450 | ||
1451 | ||
1452 | /** | |
1453 | * smack_inode_listsecurity - list the Smack attributes | |
1454 | * @inode: the object | |
1455 | * @buffer: where they go | |
1456 | * @buffer_size: size of buffer | |
e114e473 CS |
1457 | */ |
1458 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1459 | size_t buffer_size) | |
1460 | { | |
fd5c9d23 | 1461 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1462 | |
fd5c9d23 | 1463 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1464 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1465 | |
1466 | return len; | |
e114e473 CS |
1467 | } |
1468 | ||
d20bdda6 AD |
1469 | /** |
1470 | * smack_inode_getsecid - Extract inode's security id | |
1471 | * @inode: inode to extract the info from | |
1472 | * @secid: where result will be saved | |
1473 | */ | |
d6335d77 | 1474 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1475 | { |
0f8983cf | 1476 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1477 | |
0f8983cf | 1478 | *secid = skp->smk_secid; |
d20bdda6 AD |
1479 | } |
1480 | ||
e114e473 CS |
1481 | /* |
1482 | * File Hooks | |
1483 | */ | |
1484 | ||
491a0b08 CS |
1485 | /* |
1486 | * There is no smack_file_permission hook | |
e114e473 CS |
1487 | * |
1488 | * Should access checks be done on each read or write? | |
1489 | * UNICOS and SELinux say yes. | |
1490 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1491 | * | |
1492 | * I'll say no for now. Smack does not do the frequent | |
1493 | * label changing that SELinux does. | |
1494 | */ | |
e114e473 CS |
1495 | |
1496 | /** | |
1497 | * smack_file_alloc_security - assign a file security blob | |
1498 | * @file: the object | |
1499 | * | |
1500 | * The security blob for a file is a pointer to the master | |
1501 | * label list, so no allocation is done. | |
1502 | * | |
5e7270a6 CS |
1503 | * f_security is the owner security information. It |
1504 | * isn't used on file access checks, it's for send_sigio. | |
1505 | * | |
e114e473 CS |
1506 | * Returns 0 |
1507 | */ | |
1508 | static int smack_file_alloc_security(struct file *file) | |
1509 | { | |
f28952ac | 1510 | struct smack_known **blob = smack_file(file); |
2f823ff8 | 1511 | |
f28952ac | 1512 | *blob = smk_of_current(); |
e114e473 CS |
1513 | return 0; |
1514 | } | |
1515 | ||
e114e473 CS |
1516 | /** |
1517 | * smack_file_ioctl - Smack check on ioctls | |
1518 | * @file: the object | |
1519 | * @cmd: what to do | |
1520 | * @arg: unused | |
1521 | * | |
1522 | * Relies heavily on the correct use of the ioctl command conventions. | |
1523 | * | |
1524 | * Returns 0 if allowed, error code otherwise | |
1525 | */ | |
1526 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1527 | unsigned long arg) | |
1528 | { | |
1529 | int rc = 0; | |
ecfcc53f | 1530 | struct smk_audit_info ad; |
5e7270a6 | 1531 | struct inode *inode = file_inode(file); |
ecfcc53f | 1532 | |
83a1e53f SWK |
1533 | if (unlikely(IS_PRIVATE(inode))) |
1534 | return 0; | |
1535 | ||
f48b7399 | 1536 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1537 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1538 | |
d166c802 | 1539 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1540 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1541 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1542 | } | |
e114e473 | 1543 | |
d166c802 | 1544 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1545 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1546 | rc = smk_bu_file(file, MAY_READ, rc); |
1547 | } | |
e114e473 CS |
1548 | |
1549 | return rc; | |
1550 | } | |
1551 | ||
1552 | /** | |
1553 | * smack_file_lock - Smack check on file locking | |
1554 | * @file: the object | |
251a2a95 | 1555 | * @cmd: unused |
e114e473 | 1556 | * |
c0ab6e56 | 1557 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1558 | */ |
1559 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1560 | { | |
ecfcc53f | 1561 | struct smk_audit_info ad; |
d166c802 | 1562 | int rc; |
5e7270a6 | 1563 | struct inode *inode = file_inode(file); |
ecfcc53f | 1564 | |
83a1e53f SWK |
1565 | if (unlikely(IS_PRIVATE(inode))) |
1566 | return 0; | |
1567 | ||
92f42509 EP |
1568 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1569 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1570 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1571 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1572 | return rc; | |
e114e473 CS |
1573 | } |
1574 | ||
1575 | /** | |
1576 | * smack_file_fcntl - Smack check on fcntl | |
1577 | * @file: the object | |
1578 | * @cmd: what action to check | |
1579 | * @arg: unused | |
1580 | * | |
531f1d45 CS |
1581 | * Generally these operations are harmless. |
1582 | * File locking operations present an obvious mechanism | |
1583 | * for passing information, so they require write access. | |
1584 | * | |
e114e473 CS |
1585 | * Returns 0 if current has access, error code otherwise |
1586 | */ | |
1587 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1588 | unsigned long arg) | |
1589 | { | |
ecfcc53f | 1590 | struct smk_audit_info ad; |
531f1d45 | 1591 | int rc = 0; |
5e7270a6 | 1592 | struct inode *inode = file_inode(file); |
ecfcc53f | 1593 | |
83a1e53f SWK |
1594 | if (unlikely(IS_PRIVATE(inode))) |
1595 | return 0; | |
1596 | ||
e114e473 | 1597 | switch (cmd) { |
e114e473 | 1598 | case F_GETLK: |
c0ab6e56 | 1599 | break; |
e114e473 CS |
1600 | case F_SETLK: |
1601 | case F_SETLKW: | |
c0ab6e56 CS |
1602 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1603 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1604 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1605 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1606 | break; |
e114e473 CS |
1607 | case F_SETOWN: |
1608 | case F_SETSIG: | |
531f1d45 CS |
1609 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1610 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1611 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1612 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1613 | break; |
1614 | default: | |
531f1d45 | 1615 | break; |
e114e473 CS |
1616 | } |
1617 | ||
1618 | return rc; | |
1619 | } | |
1620 | ||
7898e1f8 | 1621 | /** |
e5467859 | 1622 | * smack_mmap_file : |
7898e1f8 CS |
1623 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1624 | * if mapping anonymous memory. | |
1625 | * @file contains the file structure for file to map (may be NULL). | |
1626 | * @reqprot contains the protection requested by the application. | |
1627 | * @prot contains the protection that will be applied by the kernel. | |
1628 | * @flags contains the operational flags. | |
1629 | * Return 0 if permission is granted. | |
1630 | */ | |
e5467859 | 1631 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1632 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1633 | unsigned long flags) |
7898e1f8 | 1634 | { |
272cd7a8 | 1635 | struct smack_known *skp; |
2f823ff8 | 1636 | struct smack_known *mkp; |
7898e1f8 CS |
1637 | struct smack_rule *srp; |
1638 | struct task_smack *tsp; | |
21c7eae2 | 1639 | struct smack_known *okp; |
7898e1f8 | 1640 | struct inode_smack *isp; |
809c02e0 | 1641 | struct superblock_smack *sbsp; |
0e0a070d CS |
1642 | int may; |
1643 | int mmay; | |
1644 | int tmay; | |
7898e1f8 CS |
1645 | int rc; |
1646 | ||
496ad9aa | 1647 | if (file == NULL) |
7898e1f8 CS |
1648 | return 0; |
1649 | ||
83a1e53f SWK |
1650 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1651 | return 0; | |
1652 | ||
fb4021b6 | 1653 | isp = smack_inode(file_inode(file)); |
7898e1f8 CS |
1654 | if (isp->smk_mmap == NULL) |
1655 | return 0; | |
1aea7808 | 1656 | sbsp = smack_superblock(file_inode(file)->i_sb); |
809c02e0 SF |
1657 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && |
1658 | isp->smk_mmap != sbsp->smk_root) | |
1659 | return -EACCES; | |
2f823ff8 | 1660 | mkp = isp->smk_mmap; |
7898e1f8 | 1661 | |
b17103a8 | 1662 | tsp = smack_cred(current_cred()); |
2f823ff8 | 1663 | skp = smk_of_current(); |
7898e1f8 CS |
1664 | rc = 0; |
1665 | ||
1666 | rcu_read_lock(); | |
1667 | /* | |
1668 | * For each Smack rule associated with the subject | |
1669 | * label verify that the SMACK64MMAP also has access | |
1670 | * to that rule's object label. | |
7898e1f8 | 1671 | */ |
272cd7a8 | 1672 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1673 | okp = srp->smk_object; |
7898e1f8 CS |
1674 | /* |
1675 | * Matching labels always allows access. | |
1676 | */ | |
21c7eae2 | 1677 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1678 | continue; |
0e0a070d CS |
1679 | /* |
1680 | * If there is a matching local rule take | |
1681 | * that into account as well. | |
1682 | */ | |
21c7eae2 LP |
1683 | may = smk_access_entry(srp->smk_subject->smk_known, |
1684 | okp->smk_known, | |
1685 | &tsp->smk_rules); | |
0e0a070d CS |
1686 | if (may == -ENOENT) |
1687 | may = srp->smk_access; | |
1688 | else | |
1689 | may &= srp->smk_access; | |
1690 | /* | |
1691 | * If may is zero the SMACK64MMAP subject can't | |
1692 | * possibly have less access. | |
1693 | */ | |
1694 | if (may == 0) | |
1695 | continue; | |
1696 | ||
1697 | /* | |
1698 | * Fetch the global list entry. | |
1699 | * If there isn't one a SMACK64MMAP subject | |
1700 | * can't have as much access as current. | |
1701 | */ | |
21c7eae2 LP |
1702 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1703 | &mkp->smk_rules); | |
0e0a070d CS |
1704 | if (mmay == -ENOENT) { |
1705 | rc = -EACCES; | |
1706 | break; | |
1707 | } | |
1708 | /* | |
1709 | * If there is a local entry it modifies the | |
1710 | * potential access, too. | |
1711 | */ | |
21c7eae2 LP |
1712 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1713 | &tsp->smk_rules); | |
0e0a070d CS |
1714 | if (tmay != -ENOENT) |
1715 | mmay &= tmay; | |
7898e1f8 | 1716 | |
0e0a070d CS |
1717 | /* |
1718 | * If there is any access available to current that is | |
1719 | * not available to a SMACK64MMAP subject | |
1720 | * deny access. | |
1721 | */ | |
75a25637 | 1722 | if ((may | mmay) != mmay) { |
0e0a070d | 1723 | rc = -EACCES; |
7898e1f8 | 1724 | break; |
0e0a070d | 1725 | } |
7898e1f8 CS |
1726 | } |
1727 | ||
1728 | rcu_read_unlock(); | |
1729 | ||
1730 | return rc; | |
1731 | } | |
1732 | ||
e114e473 CS |
1733 | /** |
1734 | * smack_file_set_fowner - set the file security blob value | |
1735 | * @file: object in question | |
1736 | * | |
e114e473 | 1737 | */ |
e0b93edd | 1738 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1739 | { |
f28952ac CS |
1740 | struct smack_known **blob = smack_file(file); |
1741 | ||
1742 | *blob = smk_of_current(); | |
e114e473 CS |
1743 | } |
1744 | ||
1745 | /** | |
1746 | * smack_file_send_sigiotask - Smack on sigio | |
1747 | * @tsk: The target task | |
1748 | * @fown: the object the signal come from | |
1749 | * @signum: unused | |
1750 | * | |
1751 | * Allow a privileged task to get signals even if it shouldn't | |
1752 | * | |
1753 | * Returns 0 if a subject with the object's smack could | |
1754 | * write to the task, an error code otherwise. | |
1755 | */ | |
1756 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1757 | struct fown_struct *fown, int signum) | |
1758 | { | |
f28952ac | 1759 | struct smack_known **blob; |
2f823ff8 | 1760 | struct smack_known *skp; |
b17103a8 | 1761 | struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred)); |
dcb569cf | 1762 | const struct cred *tcred; |
e114e473 CS |
1763 | struct file *file; |
1764 | int rc; | |
ecfcc53f | 1765 | struct smk_audit_info ad; |
e114e473 CS |
1766 | |
1767 | /* | |
1768 | * struct fown_struct is never outside the context of a struct file | |
1769 | */ | |
1770 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1771 | |
ecfcc53f | 1772 | /* we don't log here as rc can be overriden */ |
f28952ac CS |
1773 | blob = smack_file(file); |
1774 | skp = *blob; | |
c60b9066 CS |
1775 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1776 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1777 | |
1778 | rcu_read_lock(); | |
1779 | tcred = __task_cred(tsk); | |
1780 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1781 | rc = 0; |
dcb569cf | 1782 | rcu_read_unlock(); |
ecfcc53f EB |
1783 | |
1784 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1785 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1786 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1787 | return rc; |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * smack_file_receive - Smack file receive check | |
1792 | * @file: the object | |
1793 | * | |
1794 | * Returns 0 if current has access, error code otherwise | |
1795 | */ | |
1796 | static int smack_file_receive(struct file *file) | |
1797 | { | |
d166c802 | 1798 | int rc; |
e114e473 | 1799 | int may = 0; |
ecfcc53f | 1800 | struct smk_audit_info ad; |
5e7270a6 | 1801 | struct inode *inode = file_inode(file); |
79be0935 CS |
1802 | struct socket *sock; |
1803 | struct task_smack *tsp; | |
1804 | struct socket_smack *ssp; | |
e114e473 | 1805 | |
9777582e SWK |
1806 | if (unlikely(IS_PRIVATE(inode))) |
1807 | return 0; | |
1808 | ||
4482a44f | 1809 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1810 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1811 | |
51d59af2 | 1812 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 | 1813 | sock = SOCKET_I(inode); |
12ddb08a | 1814 | ssp = smack_sock(sock->sk); |
b17103a8 | 1815 | tsp = smack_cred(current_cred()); |
79be0935 CS |
1816 | /* |
1817 | * If the receiving process can't write to the | |
1818 | * passed socket or if the passed socket can't | |
1819 | * write to the receiving process don't accept | |
1820 | * the passed socket. | |
1821 | */ | |
1822 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1823 | rc = smk_bu_file(file, may, rc); | |
1824 | if (rc < 0) | |
1825 | return rc; | |
1826 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1827 | rc = smk_bu_file(file, may, rc); | |
1828 | return rc; | |
1829 | } | |
e114e473 CS |
1830 | /* |
1831 | * This code relies on bitmasks. | |
1832 | */ | |
1833 | if (file->f_mode & FMODE_READ) | |
1834 | may = MAY_READ; | |
1835 | if (file->f_mode & FMODE_WRITE) | |
1836 | may |= MAY_WRITE; | |
1837 | ||
5e7270a6 | 1838 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1839 | rc = smk_bu_file(file, may, rc); |
1840 | return rc; | |
e114e473 CS |
1841 | } |
1842 | ||
531f1d45 | 1843 | /** |
83d49856 | 1844 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1845 | * @file: the object |
531f1d45 CS |
1846 | * |
1847 | * Set the security blob in the file structure. | |
a6834c0b CS |
1848 | * Allow the open only if the task has read access. There are |
1849 | * many read operations (e.g. fstat) that you can do with an | |
1850 | * fd even if you have the file open write-only. | |
531f1d45 | 1851 | * |
a1a07f22 | 1852 | * Returns 0 if current has access, error code otherwise |
531f1d45 | 1853 | */ |
94817692 | 1854 | static int smack_file_open(struct file *file) |
531f1d45 | 1855 | { |
b17103a8 | 1856 | struct task_smack *tsp = smack_cred(file->f_cred); |
5e7270a6 | 1857 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1858 | struct smk_audit_info ad; |
1859 | int rc; | |
531f1d45 | 1860 | |
a6834c0b CS |
1861 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1862 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1863 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1864 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1865 | |
1866 | return rc; | |
531f1d45 CS |
1867 | } |
1868 | ||
e114e473 CS |
1869 | /* |
1870 | * Task hooks | |
1871 | */ | |
1872 | ||
ee18d64c DH |
1873 | /** |
1874 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
a1a07f22 | 1875 | * @cred: the new credentials |
ee18d64c DH |
1876 | * @gfp: the atomicity of any memory allocations |
1877 | * | |
1878 | * Prepare a blank set of credentials for modification. This must allocate all | |
1879 | * the memory the LSM module might require such that cred_transfer() can | |
1880 | * complete without error. | |
1881 | */ | |
1882 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1883 | { | |
bbd3662a | 1884 | init_task_smack(smack_cred(cred), NULL, NULL); |
ee18d64c DH |
1885 | return 0; |
1886 | } | |
1887 | ||
1888 | ||
e114e473 | 1889 | /** |
f1752eec DH |
1890 | * smack_cred_free - "free" task-level security credentials |
1891 | * @cred: the credentials in question | |
e114e473 | 1892 | * |
e114e473 | 1893 | */ |
f1752eec | 1894 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1895 | { |
b17103a8 | 1896 | struct task_smack *tsp = smack_cred(cred); |
7898e1f8 CS |
1897 | struct smack_rule *rp; |
1898 | struct list_head *l; | |
1899 | struct list_head *n; | |
1900 | ||
38416e53 ZJ |
1901 | smk_destroy_label_list(&tsp->smk_relabel); |
1902 | ||
7898e1f8 CS |
1903 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1904 | rp = list_entry(l, struct smack_rule, list); | |
1905 | list_del(&rp->list); | |
4e328b08 | 1906 | kmem_cache_free(smack_rule_cache, rp); |
7898e1f8 | 1907 | } |
e114e473 CS |
1908 | } |
1909 | ||
d84f4f99 DH |
1910 | /** |
1911 | * smack_cred_prepare - prepare new set of credentials for modification | |
1912 | * @new: the new credentials | |
1913 | * @old: the original credentials | |
1914 | * @gfp: the atomicity of any memory allocations | |
1915 | * | |
1916 | * Prepare a new set of credentials for modification. | |
1917 | */ | |
1918 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1919 | gfp_t gfp) | |
1920 | { | |
b17103a8 | 1921 | struct task_smack *old_tsp = smack_cred(old); |
bbd3662a | 1922 | struct task_smack *new_tsp = smack_cred(new); |
7898e1f8 | 1923 | int rc; |
676dac4b | 1924 | |
bbd3662a | 1925 | init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task); |
b437aba8 | 1926 | |
7898e1f8 CS |
1927 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1928 | if (rc != 0) | |
1929 | return rc; | |
1930 | ||
38416e53 ZJ |
1931 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
1932 | gfp); | |
bbd3662a | 1933 | return rc; |
d84f4f99 DH |
1934 | } |
1935 | ||
ee18d64c DH |
1936 | /** |
1937 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1938 | * @new: the new credentials | |
1939 | * @old: the original credentials | |
1940 | * | |
1941 | * Fill in a set of blank credentials from another set of credentials. | |
1942 | */ | |
1943 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1944 | { | |
b17103a8 CS |
1945 | struct task_smack *old_tsp = smack_cred(old); |
1946 | struct task_smack *new_tsp = smack_cred(new); | |
676dac4b CS |
1947 | |
1948 | new_tsp->smk_task = old_tsp->smk_task; | |
1949 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1950 | mutex_init(&new_tsp->smk_rules_lock); |
1951 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1952 | ||
7898e1f8 | 1953 | /* cbs copy rule list */ |
ee18d64c DH |
1954 | } |
1955 | ||
3ec30113 MG |
1956 | /** |
1957 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
a1a07f22 | 1958 | * @cred: the object creds |
3ec30113 MG |
1959 | * @secid: where to put the result |
1960 | * | |
1961 | * Sets the secid to contain a u32 version of the smack label. | |
1962 | */ | |
b17103a8 | 1963 | static void smack_cred_getsecid(const struct cred *cred, u32 *secid) |
3ec30113 MG |
1964 | { |
1965 | struct smack_known *skp; | |
1966 | ||
1967 | rcu_read_lock(); | |
b17103a8 | 1968 | skp = smk_of_task(smack_cred(cred)); |
3ec30113 MG |
1969 | *secid = skp->smk_secid; |
1970 | rcu_read_unlock(); | |
1971 | } | |
1972 | ||
3a3b7ce9 DH |
1973 | /** |
1974 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1975 | * @new: points to the set of credentials to be modified. |
1976 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1977 | * |
1978 | * Set the security data for a kernel service. | |
1979 | */ | |
1980 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1981 | { | |
b17103a8 | 1982 | struct task_smack *new_tsp = smack_cred(new); |
3a3b7ce9 | 1983 | |
152f91d4 | 1984 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
1985 | return 0; |
1986 | } | |
1987 | ||
1988 | /** | |
1989 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1990 | * @new: points to the set of credentials to be modified |
1991 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1992 | * |
1993 | * Set the file creation context in a set of credentials to the same | |
1994 | * as the objective context of the specified inode | |
1995 | */ | |
1996 | static int smack_kernel_create_files_as(struct cred *new, | |
1997 | struct inode *inode) | |
1998 | { | |
fb4021b6 | 1999 | struct inode_smack *isp = smack_inode(inode); |
b17103a8 | 2000 | struct task_smack *tsp = smack_cred(new); |
3a3b7ce9 | 2001 | |
21c7eae2 | 2002 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2003 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2004 | return 0; |
2005 | } | |
2006 | ||
ecfcc53f EB |
2007 | /** |
2008 | * smk_curacc_on_task - helper to log task related access | |
2009 | * @p: the task object | |
531f1d45 CS |
2010 | * @access: the access requested |
2011 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2012 | * |
2013 | * Return 0 if access is permitted | |
2014 | */ | |
531f1d45 CS |
2015 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2016 | const char *caller) | |
ecfcc53f EB |
2017 | { |
2018 | struct smk_audit_info ad; | |
a3727a8b | 2019 | struct smack_known *skp = smk_of_task_struct_obj(p); |
d166c802 | 2020 | int rc; |
ecfcc53f | 2021 | |
531f1d45 | 2022 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2023 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2024 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2025 | rc = smk_bu_task(p, access, rc); |
2026 | return rc; | |
ecfcc53f EB |
2027 | } |
2028 | ||
e114e473 CS |
2029 | /** |
2030 | * smack_task_setpgid - Smack check on setting pgid | |
2031 | * @p: the task object | |
2032 | * @pgid: unused | |
2033 | * | |
2034 | * Return 0 if write access is permitted | |
2035 | */ | |
2036 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2037 | { | |
531f1d45 | 2038 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2039 | } |
2040 | ||
2041 | /** | |
2042 | * smack_task_getpgid - Smack access check for getpgid | |
2043 | * @p: the object task | |
2044 | * | |
2045 | * Returns 0 if current can read the object task, error code otherwise | |
2046 | */ | |
2047 | static int smack_task_getpgid(struct task_struct *p) | |
2048 | { | |
531f1d45 | 2049 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2050 | } |
2051 | ||
2052 | /** | |
2053 | * smack_task_getsid - Smack access check for getsid | |
2054 | * @p: the object task | |
2055 | * | |
2056 | * Returns 0 if current can read the object task, error code otherwise | |
2057 | */ | |
2058 | static int smack_task_getsid(struct task_struct *p) | |
2059 | { | |
531f1d45 | 2060 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2061 | } |
2062 | ||
2063 | /** | |
1fb057dc PM |
2064 | * smack_task_getsecid_subj - get the subjective secid of the task |
2065 | * @p: the task | |
e114e473 CS |
2066 | * @secid: where to put the result |
2067 | * | |
1fb057dc PM |
2068 | * Sets the secid to contain a u32 version of the task's subjective smack label. |
2069 | */ | |
2070 | static void smack_task_getsecid_subj(struct task_struct *p, u32 *secid) | |
2071 | { | |
2072 | struct smack_known *skp = smk_of_task_struct_subj(p); | |
2073 | ||
2074 | *secid = skp->smk_secid; | |
2075 | } | |
2076 | ||
2077 | /** | |
2078 | * smack_task_getsecid_obj - get the objective secid of the task | |
2079 | * @p: the task | |
2080 | * @secid: where to put the result | |
2081 | * | |
2082 | * Sets the secid to contain a u32 version of the task's objective smack label. | |
e114e473 | 2083 | */ |
1fb057dc | 2084 | static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid) |
e114e473 | 2085 | { |
1fb057dc | 2086 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 CS |
2087 | |
2088 | *secid = skp->smk_secid; | |
e114e473 CS |
2089 | } |
2090 | ||
2091 | /** | |
2092 | * smack_task_setnice - Smack check on setting nice | |
2093 | * @p: the task object | |
2094 | * @nice: unused | |
2095 | * | |
2096 | * Return 0 if write access is permitted | |
2097 | */ | |
2098 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2099 | { | |
b1d9e6b0 | 2100 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2101 | } |
2102 | ||
2103 | /** | |
2104 | * smack_task_setioprio - Smack check on setting ioprio | |
2105 | * @p: the task object | |
2106 | * @ioprio: unused | |
2107 | * | |
2108 | * Return 0 if write access is permitted | |
2109 | */ | |
2110 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2111 | { | |
b1d9e6b0 | 2112 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2113 | } |
2114 | ||
2115 | /** | |
2116 | * smack_task_getioprio - Smack check on reading ioprio | |
2117 | * @p: the task object | |
2118 | * | |
2119 | * Return 0 if read access is permitted | |
2120 | */ | |
2121 | static int smack_task_getioprio(struct task_struct *p) | |
2122 | { | |
531f1d45 | 2123 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2124 | } |
2125 | ||
2126 | /** | |
2127 | * smack_task_setscheduler - Smack check on setting scheduler | |
2128 | * @p: the task object | |
e114e473 CS |
2129 | * |
2130 | * Return 0 if read access is permitted | |
2131 | */ | |
b0ae1981 | 2132 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2133 | { |
b1d9e6b0 | 2134 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2135 | } |
2136 | ||
2137 | /** | |
2138 | * smack_task_getscheduler - Smack check on reading scheduler | |
2139 | * @p: the task object | |
2140 | * | |
2141 | * Return 0 if read access is permitted | |
2142 | */ | |
2143 | static int smack_task_getscheduler(struct task_struct *p) | |
2144 | { | |
531f1d45 | 2145 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2146 | } |
2147 | ||
2148 | /** | |
2149 | * smack_task_movememory - Smack check on moving memory | |
2150 | * @p: the task object | |
2151 | * | |
2152 | * Return 0 if write access is permitted | |
2153 | */ | |
2154 | static int smack_task_movememory(struct task_struct *p) | |
2155 | { | |
531f1d45 | 2156 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2157 | } |
2158 | ||
2159 | /** | |
2160 | * smack_task_kill - Smack check on signal delivery | |
2161 | * @p: the task object | |
2162 | * @info: unused | |
2163 | * @sig: unused | |
6b4f3d01 | 2164 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2165 | * |
2166 | * Return 0 if write access is permitted | |
2167 | * | |
e114e473 | 2168 | */ |
ae7795bc | 2169 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2170 | int sig, const struct cred *cred) |
e114e473 | 2171 | { |
ecfcc53f | 2172 | struct smk_audit_info ad; |
2f823ff8 | 2173 | struct smack_known *skp; |
1fb057dc | 2174 | struct smack_known *tkp = smk_of_task_struct_obj(p); |
d166c802 | 2175 | int rc; |
ecfcc53f | 2176 | |
18d872f7 RK |
2177 | if (!sig) |
2178 | return 0; /* null signal; existence test */ | |
2179 | ||
ecfcc53f EB |
2180 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2181 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2182 | /* |
2183 | * Sending a signal requires that the sender | |
2184 | * can write the receiver. | |
2185 | */ | |
6b4f3d01 | 2186 | if (cred == NULL) { |
c60b9066 CS |
2187 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2188 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2189 | return rc; |
2190 | } | |
e114e473 | 2191 | /* |
6b4f3d01 | 2192 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2193 | * specific behavior. This is not clean. For one thing |
2194 | * we can't take privilege into account. | |
2195 | */ | |
b17103a8 | 2196 | skp = smk_of_task(smack_cred(cred)); |
c60b9066 CS |
2197 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2198 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2199 | return rc; |
e114e473 CS |
2200 | } |
2201 | ||
e114e473 CS |
2202 | /** |
2203 | * smack_task_to_inode - copy task smack into the inode blob | |
2204 | * @p: task to copy from | |
251a2a95 | 2205 | * @inode: inode to copy to |
e114e473 CS |
2206 | * |
2207 | * Sets the smack pointer in the inode security blob | |
2208 | */ | |
2209 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2210 | { | |
fb4021b6 | 2211 | struct inode_smack *isp = smack_inode(inode); |
1fb057dc | 2212 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 | 2213 | |
21c7eae2 | 2214 | isp->smk_inode = skp; |
7b4e8843 | 2215 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2216 | } |
2217 | ||
2218 | /* | |
2219 | * Socket hooks. | |
2220 | */ | |
2221 | ||
2222 | /** | |
2223 | * smack_sk_alloc_security - Allocate a socket blob | |
2224 | * @sk: the socket | |
2225 | * @family: unused | |
251a2a95 | 2226 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2227 | * |
2228 | * Assign Smack pointers to current | |
2229 | * | |
2230 | * Returns 0 on success, -ENOMEM is there's no memory | |
2231 | */ | |
2232 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2233 | { | |
2f823ff8 | 2234 | struct smack_known *skp = smk_of_current(); |
12ddb08a | 2235 | struct socket_smack *ssp = smack_sock(sk); |
e114e473 | 2236 | |
08382c9f | 2237 | /* |
2238 | * Sockets created by kernel threads receive web label. | |
2239 | */ | |
2240 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2241 | ssp->smk_in = &smack_known_web; | |
2242 | ssp->smk_out = &smack_known_web; | |
2243 | } else { | |
2244 | ssp->smk_in = skp; | |
2245 | ssp->smk_out = skp; | |
2246 | } | |
272cd7a8 | 2247 | ssp->smk_packet = NULL; |
e114e473 | 2248 | |
e114e473 CS |
2249 | return 0; |
2250 | } | |
2251 | ||
12ddb08a | 2252 | #ifdef SMACK_IPV6_PORT_LABELING |
e114e473 CS |
2253 | /** |
2254 | * smack_sk_free_security - Free a socket blob | |
2255 | * @sk: the socket | |
2256 | * | |
2257 | * Clears the blob pointer | |
2258 | */ | |
2259 | static void smack_sk_free_security(struct sock *sk) | |
2260 | { | |
0c96d1f5 VG |
2261 | struct smk_port_label *spp; |
2262 | ||
2263 | if (sk->sk_family == PF_INET6) { | |
2264 | rcu_read_lock(); | |
2265 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2266 | if (spp->smk_sock != sk) | |
2267 | continue; | |
2268 | spp->smk_can_reuse = 1; | |
2269 | break; | |
2270 | } | |
2271 | rcu_read_unlock(); | |
2272 | } | |
e114e473 | 2273 | } |
12ddb08a | 2274 | #endif |
e114e473 | 2275 | |
07feee8f | 2276 | /** |
21abb1ec | 2277 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2278 | * @sip: the object end |
2279 | * | |
2280 | * looks for host based access restrictions | |
2281 | * | |
2282 | * This version will only be appropriate for really small sets of single label | |
2283 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2284 | * taken before calling this function. | |
2285 | * | |
2286 | * Returns the label of the far end or NULL if it's not special. | |
2287 | */ | |
21abb1ec | 2288 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2289 | { |
21abb1ec | 2290 | struct smk_net4addr *snp; |
07feee8f PM |
2291 | struct in_addr *siap = &sip->sin_addr; |
2292 | ||
2293 | if (siap->s_addr == 0) | |
2294 | return NULL; | |
2295 | ||
21abb1ec CS |
2296 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2297 | /* | |
2298 | * we break after finding the first match because | |
2299 | * the list is sorted from longest to shortest mask | |
2300 | * so we have found the most specific match | |
2301 | */ | |
2302 | if (snp->smk_host.s_addr == | |
2303 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2304 | return snp->smk_label; | |
2305 | ||
2306 | return NULL; | |
2307 | } | |
2308 | ||
21abb1ec CS |
2309 | /* |
2310 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2311 | * @sip: the address | |
2312 | * | |
2313 | * Returns boolean true if this is the localhost address | |
2314 | */ | |
2315 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2316 | { | |
2317 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2318 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2319 | ||
2320 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2321 | ntohs(be16p[7]) == 1) | |
2322 | return true; | |
2323 | return false; | |
2324 | } | |
2325 | ||
2326 | /** | |
2327 | * smack_ipv6host_label - check host based restrictions | |
2328 | * @sip: the object end | |
2329 | * | |
2330 | * looks for host based access restrictions | |
2331 | * | |
2332 | * This version will only be appropriate for really small sets of single label | |
2333 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2334 | * taken before calling this function. | |
2335 | * | |
2336 | * Returns the label of the far end or NULL if it's not special. | |
2337 | */ | |
2338 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2339 | { | |
2340 | struct smk_net6addr *snp; | |
2341 | struct in6_addr *sap = &sip->sin6_addr; | |
2342 | int i; | |
2343 | int found = 0; | |
2344 | ||
2345 | /* | |
2346 | * It's local. Don't look for a host label. | |
2347 | */ | |
2348 | if (smk_ipv6_localhost(sip)) | |
2349 | return NULL; | |
2350 | ||
2351 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2352 | /* |
2353 | * If the label is NULL the entry has | |
2354 | * been renounced. Ignore it. | |
2355 | */ | |
2356 | if (snp->smk_label == NULL) | |
2357 | continue; | |
07feee8f PM |
2358 | /* |
2359 | * we break after finding the first match because | |
2360 | * the list is sorted from longest to shortest mask | |
2361 | * so we have found the most specific match | |
2362 | */ | |
21abb1ec | 2363 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2364 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2365 | snp->smk_host.s6_addr16[i]) { | |
2366 | found = 0; | |
2367 | break; | |
2368 | } | |
4303154e | 2369 | } |
21abb1ec CS |
2370 | if (found) |
2371 | return snp->smk_label; | |
2372 | } | |
07feee8f PM |
2373 | |
2374 | return NULL; | |
2375 | } | |
2376 | ||
e114e473 | 2377 | /** |
a2af0318 | 2378 | * smack_netlbl_add - Set the secattr on a socket |
e114e473 CS |
2379 | * @sk: the socket |
2380 | * | |
a2af0318 | 2381 | * Attach the outbound smack value (smk_out) to the socket. |
e114e473 CS |
2382 | * |
2383 | * Returns 0 on success or an error code | |
2384 | */ | |
a2af0318 | 2385 | static int smack_netlbl_add(struct sock *sk) |
e114e473 | 2386 | { |
12ddb08a | 2387 | struct socket_smack *ssp = smack_sock(sk); |
a2af0318 CS |
2388 | struct smack_known *skp = ssp->smk_out; |
2389 | int rc; | |
e114e473 | 2390 | |
6d3dc07c CS |
2391 | local_bh_disable(); |
2392 | bh_lock_sock_nested(sk); | |
2393 | ||
a2af0318 CS |
2394 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
2395 | switch (rc) { | |
2396 | case 0: | |
2397 | ssp->smk_state = SMK_NETLBL_LABELED; | |
2398 | break; | |
2399 | case -EDESTADDRREQ: | |
2400 | ssp->smk_state = SMK_NETLBL_REQSKB; | |
2401 | rc = 0; | |
2402 | break; | |
6d3dc07c CS |
2403 | } |
2404 | ||
2405 | bh_unlock_sock(sk); | |
2406 | local_bh_enable(); | |
4bc87e62 | 2407 | |
e114e473 CS |
2408 | return rc; |
2409 | } | |
2410 | ||
07feee8f | 2411 | /** |
a2af0318 CS |
2412 | * smack_netlbl_delete - Remove the secattr from a socket |
2413 | * @sk: the socket | |
2414 | * | |
2415 | * Remove the outbound smack value from a socket | |
2416 | */ | |
2417 | static void smack_netlbl_delete(struct sock *sk) | |
2418 | { | |
2419 | struct socket_smack *ssp = sk->sk_security; | |
2420 | ||
2421 | /* | |
2422 | * Take the label off the socket if one is set. | |
2423 | */ | |
2424 | if (ssp->smk_state != SMK_NETLBL_LABELED) | |
2425 | return; | |
2426 | ||
2427 | local_bh_disable(); | |
2428 | bh_lock_sock_nested(sk); | |
2429 | netlbl_sock_delattr(sk); | |
2430 | bh_unlock_sock(sk); | |
2431 | local_bh_enable(); | |
2432 | ssp->smk_state = SMK_NETLBL_UNLABELED; | |
2433 | } | |
2434 | ||
2435 | /** | |
2436 | * smk_ipv4_check - Perform IPv4 host access checks | |
07feee8f PM |
2437 | * @sk: the socket |
2438 | * @sap: the destination address | |
2439 | * | |
2440 | * Set the correct secattr for the given socket based on the destination | |
2441 | * address and perform any outbound access checks needed. | |
2442 | * | |
2443 | * Returns 0 on success or an error code. | |
2444 | * | |
2445 | */ | |
a2af0318 | 2446 | static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap) |
07feee8f | 2447 | { |
2f823ff8 | 2448 | struct smack_known *skp; |
a2af0318 | 2449 | int rc = 0; |
21c7eae2 | 2450 | struct smack_known *hkp; |
12ddb08a | 2451 | struct socket_smack *ssp = smack_sock(sk); |
ecfcc53f | 2452 | struct smk_audit_info ad; |
07feee8f PM |
2453 | |
2454 | rcu_read_lock(); | |
21abb1ec | 2455 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2456 | if (hkp != NULL) { |
ecfcc53f | 2457 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2458 | struct lsm_network_audit net; |
2459 | ||
48c62af6 EP |
2460 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2461 | ad.a.u.net->family = sap->sin_family; | |
2462 | ad.a.u.net->dport = sap->sin_port; | |
2463 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2464 | #endif |
2f823ff8 | 2465 | skp = ssp->smk_out; |
21c7eae2 LP |
2466 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2467 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
a2af0318 CS |
2468 | /* |
2469 | * Clear the socket netlabel if it's set. | |
2470 | */ | |
2471 | if (!rc) | |
2472 | smack_netlbl_delete(sk); | |
07feee8f PM |
2473 | } |
2474 | rcu_read_unlock(); | |
07feee8f | 2475 | |
a2af0318 | 2476 | return rc; |
07feee8f PM |
2477 | } |
2478 | ||
21abb1ec CS |
2479 | /** |
2480 | * smk_ipv6_check - check Smack access | |
2481 | * @subject: subject Smack label | |
2482 | * @object: object Smack label | |
2483 | * @address: address | |
2484 | * @act: the action being taken | |
2485 | * | |
2486 | * Check an IPv6 access | |
2487 | */ | |
2488 | static int smk_ipv6_check(struct smack_known *subject, | |
2489 | struct smack_known *object, | |
2490 | struct sockaddr_in6 *address, int act) | |
2491 | { | |
2492 | #ifdef CONFIG_AUDIT | |
2493 | struct lsm_network_audit net; | |
2494 | #endif | |
2495 | struct smk_audit_info ad; | |
2496 | int rc; | |
2497 | ||
2498 | #ifdef CONFIG_AUDIT | |
2499 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2500 | ad.a.u.net->family = PF_INET6; | |
2501 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2502 | if (act == SMK_RECEIVING) | |
2503 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2504 | else | |
2505 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2506 | #endif | |
2507 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2508 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2509 | return rc; | |
2510 | } | |
21abb1ec CS |
2511 | |
2512 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2513 | /** |
2514 | * smk_ipv6_port_label - Smack port access table management | |
2515 | * @sock: socket | |
2516 | * @address: address | |
2517 | * | |
2518 | * Create or update the port list entry | |
2519 | */ | |
2520 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2521 | { | |
2522 | struct sock *sk = sock->sk; | |
2523 | struct sockaddr_in6 *addr6; | |
12ddb08a | 2524 | struct socket_smack *ssp = smack_sock(sock->sk); |
c6739443 CS |
2525 | struct smk_port_label *spp; |
2526 | unsigned short port = 0; | |
2527 | ||
2528 | if (address == NULL) { | |
2529 | /* | |
2530 | * This operation is changing the Smack information | |
2531 | * on the bound socket. Take the changes to the port | |
2532 | * as well. | |
2533 | */ | |
3c7ce342 VG |
2534 | rcu_read_lock(); |
2535 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2536 | if (sk != spp->smk_sock) |
2537 | continue; | |
2538 | spp->smk_in = ssp->smk_in; | |
2539 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2540 | rcu_read_unlock(); |
c6739443 CS |
2541 | return; |
2542 | } | |
2543 | /* | |
2544 | * A NULL address is only used for updating existing | |
2545 | * bound entries. If there isn't one, it's OK. | |
2546 | */ | |
3c7ce342 | 2547 | rcu_read_unlock(); |
c6739443 CS |
2548 | return; |
2549 | } | |
2550 | ||
2551 | addr6 = (struct sockaddr_in6 *)address; | |
2552 | port = ntohs(addr6->sin6_port); | |
2553 | /* | |
2554 | * This is a special case that is safely ignored. | |
2555 | */ | |
2556 | if (port == 0) | |
2557 | return; | |
2558 | ||
2559 | /* | |
2560 | * Look for an existing port list entry. | |
2561 | * This is an indication that a port is getting reused. | |
2562 | */ | |
3c7ce342 VG |
2563 | rcu_read_lock(); |
2564 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2565 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2566 | continue; |
0c96d1f5 VG |
2567 | if (spp->smk_can_reuse != 1) { |
2568 | rcu_read_unlock(); | |
2569 | return; | |
2570 | } | |
c6739443 CS |
2571 | spp->smk_port = port; |
2572 | spp->smk_sock = sk; | |
2573 | spp->smk_in = ssp->smk_in; | |
2574 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2575 | spp->smk_can_reuse = 0; |
3c7ce342 | 2576 | rcu_read_unlock(); |
c6739443 CS |
2577 | return; |
2578 | } | |
3c7ce342 | 2579 | rcu_read_unlock(); |
c6739443 CS |
2580 | /* |
2581 | * A new port entry is required. | |
2582 | */ | |
2583 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2584 | if (spp == NULL) | |
2585 | return; | |
2586 | ||
2587 | spp->smk_port = port; | |
2588 | spp->smk_sock = sk; | |
2589 | spp->smk_in = ssp->smk_in; | |
2590 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2591 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2592 | spp->smk_can_reuse = 0; |
c6739443 | 2593 | |
3c7ce342 VG |
2594 | mutex_lock(&smack_ipv6_lock); |
2595 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2596 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2597 | return; |
2598 | } | |
00720f0e | 2599 | #endif |
c6739443 CS |
2600 | |
2601 | /** | |
2602 | * smk_ipv6_port_check - check Smack port access | |
a1a07f22 | 2603 | * @sk: socket |
c6739443 | 2604 | * @address: address |
a1a07f22 | 2605 | * @act: the action being taken |
c6739443 CS |
2606 | * |
2607 | * Create or update the port list entry | |
2608 | */ | |
6ea06247 | 2609 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2610 | int act) |
2611 | { | |
c6739443 | 2612 | struct smk_port_label *spp; |
12ddb08a | 2613 | struct socket_smack *ssp = smack_sock(sk); |
21abb1ec CS |
2614 | struct smack_known *skp = NULL; |
2615 | unsigned short port; | |
21c7eae2 | 2616 | struct smack_known *object; |
c6739443 CS |
2617 | |
2618 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2619 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2620 | object = ssp->smk_in; |
c6739443 | 2621 | } else { |
2f823ff8 | 2622 | skp = ssp->smk_out; |
21abb1ec | 2623 | object = smack_ipv6host_label(address); |
c6739443 CS |
2624 | } |
2625 | ||
2626 | /* | |
21abb1ec | 2627 | * The other end is a single label host. |
c6739443 | 2628 | */ |
21abb1ec CS |
2629 | if (skp != NULL && object != NULL) |
2630 | return smk_ipv6_check(skp, object, address, act); | |
2631 | if (skp == NULL) | |
2632 | skp = smack_net_ambient; | |
2633 | if (object == NULL) | |
2634 | object = smack_net_ambient; | |
c6739443 CS |
2635 | |
2636 | /* | |
2637 | * It's remote, so port lookup does no good. | |
2638 | */ | |
21abb1ec CS |
2639 | if (!smk_ipv6_localhost(address)) |
2640 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2641 | |
2642 | /* | |
2643 | * It's local so the send check has to have passed. | |
2644 | */ | |
21abb1ec CS |
2645 | if (act == SMK_RECEIVING) |
2646 | return 0; | |
c6739443 | 2647 | |
21abb1ec | 2648 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2649 | rcu_read_lock(); |
2650 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2651 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2652 | continue; |
21c7eae2 | 2653 | object = spp->smk_in; |
c6739443 | 2654 | if (act == SMK_CONNECTING) |
54e70ec5 | 2655 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2656 | break; |
2657 | } | |
3c7ce342 | 2658 | rcu_read_unlock(); |
c6739443 | 2659 | |
21abb1ec | 2660 | return smk_ipv6_check(skp, object, address, act); |
c6739443 CS |
2661 | } |
2662 | ||
e114e473 CS |
2663 | /** |
2664 | * smack_inode_setsecurity - set smack xattrs | |
2665 | * @inode: the object | |
2666 | * @name: attribute name | |
2667 | * @value: attribute value | |
2668 | * @size: size of the attribute | |
2669 | * @flags: unused | |
2670 | * | |
2671 | * Sets the named attribute in the appropriate blob | |
2672 | * | |
2673 | * Returns 0 on success, or an error code | |
2674 | */ | |
2675 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2676 | const void *value, size_t size, int flags) | |
2677 | { | |
2f823ff8 | 2678 | struct smack_known *skp; |
fb4021b6 | 2679 | struct inode_smack *nsp = smack_inode(inode); |
e114e473 CS |
2680 | struct socket_smack *ssp; |
2681 | struct socket *sock; | |
4bc87e62 | 2682 | int rc = 0; |
e114e473 | 2683 | |
f7112e6c | 2684 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2685 | return -EINVAL; |
e114e473 | 2686 | |
2f823ff8 | 2687 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2688 | if (IS_ERR(skp)) |
2689 | return PTR_ERR(skp); | |
e114e473 CS |
2690 | |
2691 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2692 | nsp->smk_inode = skp; |
ddd29ec6 | 2693 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2694 | return 0; |
2695 | } | |
2696 | /* | |
2697 | * The rest of the Smack xattrs are only on sockets. | |
2698 | */ | |
2699 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2700 | return -EOPNOTSUPP; | |
2701 | ||
2702 | sock = SOCKET_I(inode); | |
2e1d146a | 2703 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2704 | return -EOPNOTSUPP; |
2705 | ||
12ddb08a | 2706 | ssp = smack_sock(sock->sk); |
e114e473 CS |
2707 | |
2708 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2709 | ssp->smk_in = skp; |
e114e473 | 2710 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2711 | ssp->smk_out = skp; |
c6739443 | 2712 | if (sock->sk->sk_family == PF_INET) { |
a2af0318 | 2713 | rc = smack_netlbl_add(sock->sk); |
b4e0d5f0 CS |
2714 | if (rc != 0) |
2715 | printk(KERN_WARNING | |
2716 | "Smack: \"%s\" netlbl error %d.\n", | |
2717 | __func__, -rc); | |
2718 | } | |
e114e473 CS |
2719 | } else |
2720 | return -EOPNOTSUPP; | |
2721 | ||
21abb1ec | 2722 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2723 | if (sock->sk->sk_family == PF_INET6) |
2724 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2725 | #endif |
c6739443 | 2726 | |
e114e473 CS |
2727 | return 0; |
2728 | } | |
2729 | ||
2730 | /** | |
2731 | * smack_socket_post_create - finish socket setup | |
2732 | * @sock: the socket | |
2733 | * @family: protocol family | |
2734 | * @type: unused | |
2735 | * @protocol: unused | |
2736 | * @kern: unused | |
2737 | * | |
2738 | * Sets the netlabel information on the socket | |
2739 | * | |
2740 | * Returns 0 on success, and error code otherwise | |
2741 | */ | |
2742 | static int smack_socket_post_create(struct socket *sock, int family, | |
2743 | int type, int protocol, int kern) | |
2744 | { | |
7412301b ML |
2745 | struct socket_smack *ssp; |
2746 | ||
2747 | if (sock->sk == NULL) | |
2748 | return 0; | |
2749 | ||
2750 | /* | |
2751 | * Sockets created by kernel threads receive web label. | |
2752 | */ | |
2753 | if (unlikely(current->flags & PF_KTHREAD)) { | |
12ddb08a | 2754 | ssp = smack_sock(sock->sk); |
7412301b ML |
2755 | ssp->smk_in = &smack_known_web; |
2756 | ssp->smk_out = &smack_known_web; | |
2757 | } | |
2758 | ||
2759 | if (family != PF_INET) | |
e114e473 CS |
2760 | return 0; |
2761 | /* | |
2762 | * Set the outbound netlbl. | |
2763 | */ | |
a2af0318 | 2764 | return smack_netlbl_add(sock->sk); |
6d3dc07c CS |
2765 | } |
2766 | ||
5859cdf5 TG |
2767 | /** |
2768 | * smack_socket_socketpair - create socket pair | |
2769 | * @socka: one socket | |
2770 | * @sockb: another socket | |
2771 | * | |
2772 | * Cross reference the peer labels for SO_PEERSEC | |
2773 | * | |
a1a07f22 | 2774 | * Returns 0 |
5859cdf5 TG |
2775 | */ |
2776 | static int smack_socket_socketpair(struct socket *socka, | |
2777 | struct socket *sockb) | |
2778 | { | |
12ddb08a CS |
2779 | struct socket_smack *asp = smack_sock(socka->sk); |
2780 | struct socket_smack *bsp = smack_sock(sockb->sk); | |
5859cdf5 TG |
2781 | |
2782 | asp->smk_packet = bsp->smk_out; | |
2783 | bsp->smk_packet = asp->smk_out; | |
2784 | ||
2785 | return 0; | |
2786 | } | |
2787 | ||
21abb1ec | 2788 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2789 | /** |
2790 | * smack_socket_bind - record port binding information. | |
2791 | * @sock: the socket | |
2792 | * @address: the port address | |
2793 | * @addrlen: size of the address | |
2794 | * | |
2795 | * Records the label bound to a port. | |
2796 | * | |
b9ef5513 | 2797 | * Returns 0 on success, and error code otherwise |
c6739443 CS |
2798 | */ |
2799 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2800 | int addrlen) | |
2801 | { | |
b9ef5513 TH |
2802 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) { |
2803 | if (addrlen < SIN6_LEN_RFC2133 || | |
2804 | address->sa_family != AF_INET6) | |
2805 | return -EINVAL; | |
c6739443 | 2806 | smk_ipv6_port_label(sock, address); |
b9ef5513 | 2807 | } |
c6739443 CS |
2808 | return 0; |
2809 | } | |
21abb1ec | 2810 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2811 | |
6d3dc07c CS |
2812 | /** |
2813 | * smack_socket_connect - connect access check | |
2814 | * @sock: the socket | |
2815 | * @sap: the other end | |
2816 | * @addrlen: size of sap | |
2817 | * | |
2818 | * Verifies that a connection may be possible | |
2819 | * | |
2820 | * Returns 0 on success, and error code otherwise | |
2821 | */ | |
2822 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2823 | int addrlen) | |
2824 | { | |
c6739443 CS |
2825 | int rc = 0; |
2826 | ||
2827 | if (sock->sk == NULL) | |
6d3dc07c | 2828 | return 0; |
87fbfffc CS |
2829 | if (sock->sk->sk_family != PF_INET && |
2830 | (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6)) | |
2831 | return 0; | |
2832 | if (addrlen < offsetofend(struct sockaddr, sa_family)) | |
2833 | return 0; | |
2834 | if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) { | |
2835 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
00720f0e | 2836 | struct smack_known *rsp = NULL; |
da49b5da | 2837 | |
87fbfffc CS |
2838 | if (addrlen < SIN6_LEN_RFC2133) |
2839 | return 0; | |
00720f0e AB |
2840 | if (__is_defined(SMACK_IPV6_SECMARK_LABELING)) |
2841 | rsp = smack_ipv6host_label(sip); | |
87fbfffc | 2842 | if (rsp != NULL) { |
12ddb08a | 2843 | struct socket_smack *ssp = smack_sock(sock->sk); |
87fbfffc | 2844 | |
21abb1ec | 2845 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, |
87fbfffc CS |
2846 | SMK_CONNECTING); |
2847 | } | |
00720f0e AB |
2848 | if (__is_defined(SMACK_IPV6_PORT_LABELING)) |
2849 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2850 | ||
87fbfffc | 2851 | return rc; |
c6739443 | 2852 | } |
87fbfffc CS |
2853 | if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in)) |
2854 | return 0; | |
a2af0318 | 2855 | rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap); |
c6739443 | 2856 | return rc; |
e114e473 CS |
2857 | } |
2858 | ||
2859 | /** | |
2860 | * smack_flags_to_may - convert S_ to MAY_ values | |
2861 | * @flags: the S_ value | |
2862 | * | |
2863 | * Returns the equivalent MAY_ value | |
2864 | */ | |
2865 | static int smack_flags_to_may(int flags) | |
2866 | { | |
2867 | int may = 0; | |
2868 | ||
2869 | if (flags & S_IRUGO) | |
2870 | may |= MAY_READ; | |
2871 | if (flags & S_IWUGO) | |
2872 | may |= MAY_WRITE; | |
2873 | if (flags & S_IXUGO) | |
2874 | may |= MAY_EXEC; | |
2875 | ||
2876 | return may; | |
2877 | } | |
2878 | ||
2879 | /** | |
2880 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2881 | * @msg: the object | |
2882 | * | |
2883 | * Returns 0 | |
2884 | */ | |
2885 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2886 | { | |
ecd5f82e | 2887 | struct smack_known **blob = smack_msg_msg(msg); |
2f823ff8 | 2888 | |
ecd5f82e | 2889 | *blob = smk_of_current(); |
e114e473 CS |
2890 | return 0; |
2891 | } | |
2892 | ||
e114e473 | 2893 | /** |
0d79cbf8 EB |
2894 | * smack_of_ipc - the smack pointer for the ipc |
2895 | * @isp: the object | |
e114e473 CS |
2896 | * |
2897 | * Returns a pointer to the smack value | |
2898 | */ | |
0d79cbf8 | 2899 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 2900 | { |
019bcca4 CS |
2901 | struct smack_known **blob = smack_ipc(isp); |
2902 | ||
2903 | return *blob; | |
e114e473 CS |
2904 | } |
2905 | ||
2906 | /** | |
0d79cbf8 EB |
2907 | * smack_ipc_alloc_security - Set the security blob for ipc |
2908 | * @isp: the object | |
e114e473 CS |
2909 | * |
2910 | * Returns 0 | |
2911 | */ | |
0d79cbf8 | 2912 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 2913 | { |
019bcca4 | 2914 | struct smack_known **blob = smack_ipc(isp); |
e114e473 | 2915 | |
019bcca4 | 2916 | *blob = smk_of_current(); |
e114e473 CS |
2917 | return 0; |
2918 | } | |
2919 | ||
ecfcc53f EB |
2920 | /** |
2921 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 2922 | * @isp : the object |
ecfcc53f EB |
2923 | * @access : access requested |
2924 | * | |
2925 | * Returns 0 if current has the requested access, error code otherwise | |
2926 | */ | |
0d79cbf8 | 2927 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 2928 | { |
0d79cbf8 | 2929 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 2930 | struct smk_audit_info ad; |
d166c802 | 2931 | int rc; |
ecfcc53f EB |
2932 | |
2933 | #ifdef CONFIG_AUDIT | |
2934 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 2935 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 2936 | #endif |
d166c802 CS |
2937 | rc = smk_curacc(ssp, access, &ad); |
2938 | rc = smk_bu_current("shm", ssp, access, rc); | |
2939 | return rc; | |
ecfcc53f EB |
2940 | } |
2941 | ||
e114e473 CS |
2942 | /** |
2943 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 2944 | * @isp: the object |
e114e473 CS |
2945 | * @shmflg: access requested |
2946 | * | |
2947 | * Returns 0 if current has the requested access, error code otherwise | |
2948 | */ | |
0d79cbf8 | 2949 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 2950 | { |
e114e473 CS |
2951 | int may; |
2952 | ||
2953 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 2954 | return smk_curacc_shm(isp, may); |
e114e473 CS |
2955 | } |
2956 | ||
2957 | /** | |
2958 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 2959 | * @isp: the object |
e114e473 CS |
2960 | * @cmd: what it wants to do |
2961 | * | |
2962 | * Returns 0 if current has the requested access, error code otherwise | |
2963 | */ | |
0d79cbf8 | 2964 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 2965 | { |
e114e473 CS |
2966 | int may; |
2967 | ||
2968 | switch (cmd) { | |
2969 | case IPC_STAT: | |
2970 | case SHM_STAT: | |
c21a6970 | 2971 | case SHM_STAT_ANY: |
e114e473 CS |
2972 | may = MAY_READ; |
2973 | break; | |
2974 | case IPC_SET: | |
2975 | case SHM_LOCK: | |
2976 | case SHM_UNLOCK: | |
2977 | case IPC_RMID: | |
2978 | may = MAY_READWRITE; | |
2979 | break; | |
2980 | case IPC_INFO: | |
2981 | case SHM_INFO: | |
2982 | /* | |
2983 | * System level information. | |
2984 | */ | |
2985 | return 0; | |
2986 | default: | |
2987 | return -EINVAL; | |
2988 | } | |
0d79cbf8 | 2989 | return smk_curacc_shm(isp, may); |
e114e473 CS |
2990 | } |
2991 | ||
2992 | /** | |
2993 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 2994 | * @isp: the object |
e114e473 CS |
2995 | * @shmaddr: unused |
2996 | * @shmflg: access requested | |
2997 | * | |
2998 | * Returns 0 if current has the requested access, error code otherwise | |
2999 | */ | |
a1a07f22 | 3000 | static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr, |
e114e473 CS |
3001 | int shmflg) |
3002 | { | |
e114e473 CS |
3003 | int may; |
3004 | ||
3005 | may = smack_flags_to_may(shmflg); | |
a1a07f22 | 3006 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3007 | } |
3008 | ||
ecfcc53f EB |
3009 | /** |
3010 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3011 | * @isp : the object |
ecfcc53f EB |
3012 | * @access : access requested |
3013 | * | |
3014 | * Returns 0 if current has the requested access, error code otherwise | |
3015 | */ | |
0d79cbf8 | 3016 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3017 | { |
0d79cbf8 | 3018 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3019 | struct smk_audit_info ad; |
d166c802 | 3020 | int rc; |
ecfcc53f EB |
3021 | |
3022 | #ifdef CONFIG_AUDIT | |
3023 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3024 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3025 | #endif |
d166c802 CS |
3026 | rc = smk_curacc(ssp, access, &ad); |
3027 | rc = smk_bu_current("sem", ssp, access, rc); | |
3028 | return rc; | |
ecfcc53f EB |
3029 | } |
3030 | ||
e114e473 CS |
3031 | /** |
3032 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3033 | * @isp: the object |
e114e473 CS |
3034 | * @semflg: access requested |
3035 | * | |
3036 | * Returns 0 if current has the requested access, error code otherwise | |
3037 | */ | |
0d79cbf8 | 3038 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3039 | { |
e114e473 CS |
3040 | int may; |
3041 | ||
3042 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3043 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3044 | } |
3045 | ||
3046 | /** | |
3047 | * smack_sem_shmctl - Smack access check for sem | |
0d79cbf8 | 3048 | * @isp: the object |
e114e473 CS |
3049 | * @cmd: what it wants to do |
3050 | * | |
3051 | * Returns 0 if current has the requested access, error code otherwise | |
3052 | */ | |
0d79cbf8 | 3053 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3054 | { |
e114e473 CS |
3055 | int may; |
3056 | ||
3057 | switch (cmd) { | |
3058 | case GETPID: | |
3059 | case GETNCNT: | |
3060 | case GETZCNT: | |
3061 | case GETVAL: | |
3062 | case GETALL: | |
3063 | case IPC_STAT: | |
3064 | case SEM_STAT: | |
a280d6dc | 3065 | case SEM_STAT_ANY: |
e114e473 CS |
3066 | may = MAY_READ; |
3067 | break; | |
3068 | case SETVAL: | |
3069 | case SETALL: | |
3070 | case IPC_RMID: | |
3071 | case IPC_SET: | |
3072 | may = MAY_READWRITE; | |
3073 | break; | |
3074 | case IPC_INFO: | |
3075 | case SEM_INFO: | |
3076 | /* | |
3077 | * System level information | |
3078 | */ | |
3079 | return 0; | |
3080 | default: | |
3081 | return -EINVAL; | |
3082 | } | |
3083 | ||
0d79cbf8 | 3084 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3085 | } |
3086 | ||
3087 | /** | |
3088 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3089 | * @isp: the object |
e114e473 CS |
3090 | * @sops: unused |
3091 | * @nsops: unused | |
3092 | * @alter: unused | |
3093 | * | |
3094 | * Treated as read and write in all cases. | |
3095 | * | |
3096 | * Returns 0 if access is allowed, error code otherwise | |
3097 | */ | |
0d79cbf8 | 3098 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3099 | unsigned nsops, int alter) |
3100 | { | |
0d79cbf8 | 3101 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3102 | } |
3103 | ||
ecfcc53f EB |
3104 | /** |
3105 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3106 | * @isp : the msq |
ecfcc53f EB |
3107 | * @access : access requested |
3108 | * | |
3109 | * return 0 if current has access, error otherwise | |
3110 | */ | |
0d79cbf8 | 3111 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3112 | { |
0d79cbf8 | 3113 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3114 | struct smk_audit_info ad; |
d166c802 | 3115 | int rc; |
ecfcc53f EB |
3116 | |
3117 | #ifdef CONFIG_AUDIT | |
3118 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3119 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3120 | #endif |
d166c802 CS |
3121 | rc = smk_curacc(msp, access, &ad); |
3122 | rc = smk_bu_current("msq", msp, access, rc); | |
3123 | return rc; | |
ecfcc53f EB |
3124 | } |
3125 | ||
e114e473 CS |
3126 | /** |
3127 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3128 | * @isp: the object |
e114e473 CS |
3129 | * @msqflg: access requested |
3130 | * | |
3131 | * Returns 0 if current has the requested access, error code otherwise | |
3132 | */ | |
0d79cbf8 | 3133 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3134 | { |
e114e473 CS |
3135 | int may; |
3136 | ||
3137 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3138 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3139 | } |
3140 | ||
3141 | /** | |
3142 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3143 | * @isp: the object |
e114e473 CS |
3144 | * @cmd: what it wants to do |
3145 | * | |
3146 | * Returns 0 if current has the requested access, error code otherwise | |
3147 | */ | |
0d79cbf8 | 3148 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3149 | { |
e114e473 CS |
3150 | int may; |
3151 | ||
3152 | switch (cmd) { | |
3153 | case IPC_STAT: | |
3154 | case MSG_STAT: | |
23c8cec8 | 3155 | case MSG_STAT_ANY: |
e114e473 CS |
3156 | may = MAY_READ; |
3157 | break; | |
3158 | case IPC_SET: | |
3159 | case IPC_RMID: | |
3160 | may = MAY_READWRITE; | |
3161 | break; | |
3162 | case IPC_INFO: | |
3163 | case MSG_INFO: | |
3164 | /* | |
3165 | * System level information | |
3166 | */ | |
3167 | return 0; | |
3168 | default: | |
3169 | return -EINVAL; | |
3170 | } | |
3171 | ||
0d79cbf8 | 3172 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3173 | } |
3174 | ||
3175 | /** | |
3176 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3177 | * @isp: the object |
e114e473 CS |
3178 | * @msg: unused |
3179 | * @msqflg: access requested | |
3180 | * | |
3181 | * Returns 0 if current has the requested access, error code otherwise | |
3182 | */ | |
0d79cbf8 | 3183 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3184 | int msqflg) |
3185 | { | |
ecfcc53f | 3186 | int may; |
e114e473 | 3187 | |
ecfcc53f | 3188 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3189 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3190 | } |
3191 | ||
3192 | /** | |
3193 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3194 | * @isp: the object |
e114e473 CS |
3195 | * @msg: unused |
3196 | * @target: unused | |
3197 | * @type: unused | |
3198 | * @mode: unused | |
3199 | * | |
3200 | * Returns 0 if current has read and write access, error code otherwise | |
3201 | */ | |
0d79cbf8 | 3202 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3203 | struct task_struct *target, long type, int mode) |
3204 | { | |
0d79cbf8 | 3205 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3206 | } |
3207 | ||
3208 | /** | |
3209 | * smack_ipc_permission - Smack access for ipc_permission() | |
3210 | * @ipp: the object permissions | |
3211 | * @flag: access requested | |
3212 | * | |
3213 | * Returns 0 if current has read and write access, error code otherwise | |
3214 | */ | |
3215 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3216 | { | |
019bcca4 CS |
3217 | struct smack_known **blob = smack_ipc(ipp); |
3218 | struct smack_known *iskp = *blob; | |
ecfcc53f EB |
3219 | int may = smack_flags_to_may(flag); |
3220 | struct smk_audit_info ad; | |
d166c802 | 3221 | int rc; |
e114e473 | 3222 | |
ecfcc53f EB |
3223 | #ifdef CONFIG_AUDIT |
3224 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3225 | ad.a.u.ipc_id = ipp->id; | |
3226 | #endif | |
21c7eae2 LP |
3227 | rc = smk_curacc(iskp, may, &ad); |
3228 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3229 | return rc; |
e114e473 CS |
3230 | } |
3231 | ||
d20bdda6 AD |
3232 | /** |
3233 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3234 | * @ipp: the object permissions |
d20bdda6 AD |
3235 | * @secid: where result will be saved |
3236 | */ | |
3237 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3238 | { | |
019bcca4 CS |
3239 | struct smack_known **blob = smack_ipc(ipp); |
3240 | struct smack_known *iskp = *blob; | |
d20bdda6 | 3241 | |
21c7eae2 | 3242 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3243 | } |
3244 | ||
e114e473 CS |
3245 | /** |
3246 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3247 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3248 | * @inode: the object |
3249 | * | |
3250 | * Set the inode's security blob if it hasn't been done already. | |
3251 | */ | |
3252 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3253 | { | |
3254 | struct super_block *sbp; | |
3255 | struct superblock_smack *sbsp; | |
3256 | struct inode_smack *isp; | |
2f823ff8 CS |
3257 | struct smack_known *skp; |
3258 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3259 | struct smack_known *final; |
5c6d1125 JS |
3260 | char trattr[TRANS_TRUE_SIZE]; |
3261 | int transflag = 0; | |
2267b13a | 3262 | int rc; |
e114e473 CS |
3263 | struct dentry *dp; |
3264 | ||
3265 | if (inode == NULL) | |
3266 | return; | |
3267 | ||
fb4021b6 | 3268 | isp = smack_inode(inode); |
e114e473 | 3269 | |
e114e473 CS |
3270 | /* |
3271 | * If the inode is already instantiated | |
3272 | * take the quick way out | |
3273 | */ | |
3274 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
921bb1cb | 3275 | return; |
e114e473 CS |
3276 | |
3277 | sbp = inode->i_sb; | |
1aea7808 | 3278 | sbsp = smack_superblock(sbp); |
e114e473 CS |
3279 | /* |
3280 | * We're going to use the superblock default label | |
3281 | * if there's no label on the file. | |
3282 | */ | |
3283 | final = sbsp->smk_default; | |
3284 | ||
e97dcb0e CS |
3285 | /* |
3286 | * If this is the root inode the superblock | |
3287 | * may be in the process of initialization. | |
3288 | * If that is the case use the root value out | |
3289 | * of the superblock. | |
3290 | */ | |
3291 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3292 | switch (sbp->s_magic) { |
3293 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3294 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3295 | /* |
3296 | * The cgroup filesystem is never mounted, | |
3297 | * so there's no opportunity to set the mount | |
3298 | * options. | |
3299 | */ | |
21c7eae2 LP |
3300 | sbsp->smk_root = &smack_known_star; |
3301 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3302 | isp->smk_inode = sbsp->smk_root; |
3303 | break; | |
3304 | case TMPFS_MAGIC: | |
3305 | /* | |
3306 | * What about shmem/tmpfs anonymous files with dentry | |
3307 | * obtained from d_alloc_pseudo()? | |
3308 | */ | |
3309 | isp->smk_inode = smk_of_current(); | |
3310 | break; | |
8da4aba5 RK |
3311 | case PIPEFS_MAGIC: |
3312 | isp->smk_inode = smk_of_current(); | |
3313 | break; | |
805b65a8 RK |
3314 | case SOCKFS_MAGIC: |
3315 | /* | |
3316 | * Socket access is controlled by the socket | |
3317 | * structures associated with the task involved. | |
3318 | */ | |
3319 | isp->smk_inode = &smack_known_star; | |
3320 | break; | |
1d8c2326 ŁS |
3321 | default: |
3322 | isp->smk_inode = sbsp->smk_root; | |
3323 | break; | |
36ea735b | 3324 | } |
e97dcb0e | 3325 | isp->smk_flags |= SMK_INODE_INSTANT; |
921bb1cb | 3326 | return; |
e97dcb0e CS |
3327 | } |
3328 | ||
e114e473 CS |
3329 | /* |
3330 | * This is pretty hackish. | |
3331 | * Casey says that we shouldn't have to do | |
3332 | * file system specific code, but it does help | |
3333 | * with keeping it simple. | |
3334 | */ | |
3335 | switch (sbp->s_magic) { | |
3336 | case SMACK_MAGIC: | |
36ea735b | 3337 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3338 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3339 | /* |
25985edc | 3340 | * Casey says that it's a little embarrassing |
e114e473 CS |
3341 | * that the smack file system doesn't do |
3342 | * extended attributes. | |
36ea735b | 3343 | * |
36ea735b | 3344 | * Cgroupfs is special |
e114e473 | 3345 | */ |
21c7eae2 | 3346 | final = &smack_known_star; |
e114e473 CS |
3347 | break; |
3348 | case DEVPTS_SUPER_MAGIC: | |
3349 | /* | |
3350 | * devpts seems content with the label of the task. | |
3351 | * Programs that change smack have to treat the | |
3352 | * pty with respect. | |
3353 | */ | |
21c7eae2 | 3354 | final = ckp; |
e114e473 | 3355 | break; |
e114e473 CS |
3356 | case PROC_SUPER_MAGIC: |
3357 | /* | |
3358 | * Casey says procfs appears not to care. | |
3359 | * The superblock default suffices. | |
3360 | */ | |
3361 | break; | |
3362 | case TMPFS_MAGIC: | |
3363 | /* | |
3364 | * Device labels should come from the filesystem, | |
3365 | * but watch out, because they're volitile, | |
3366 | * getting recreated on every reboot. | |
3367 | */ | |
21c7eae2 | 3368 | final = &smack_known_star; |
e114e473 | 3369 | /* |
e114e473 CS |
3370 | * If a smack value has been set we want to use it, |
3371 | * but since tmpfs isn't giving us the opportunity | |
3372 | * to set mount options simulate setting the | |
3373 | * superblock default. | |
3374 | */ | |
df561f66 | 3375 | fallthrough; |
e114e473 CS |
3376 | default: |
3377 | /* | |
3378 | * This isn't an understood special case. | |
3379 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3380 | */ |
3381 | ||
3382 | /* | |
3383 | * UNIX domain sockets use lower level socket data. | |
3384 | */ | |
3385 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3386 | final = &smack_known_star; |
b4e0d5f0 CS |
3387 | break; |
3388 | } | |
3389 | /* | |
e114e473 CS |
3390 | * No xattr support means, alas, no SMACK label. |
3391 | * Use the aforeapplied default. | |
3392 | * It would be curious if the label of the task | |
3393 | * does not match that assigned. | |
3394 | */ | |
5d6c3191 AG |
3395 | if (!(inode->i_opflags & IOP_XATTR)) |
3396 | break; | |
e114e473 CS |
3397 | /* |
3398 | * Get the dentry for xattr. | |
3399 | */ | |
3e62cbb8 | 3400 | dp = dget(opt_dentry); |
2f823ff8 | 3401 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3402 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3403 | final = skp; |
2267b13a CS |
3404 | |
3405 | /* | |
3406 | * Transmuting directory | |
3407 | */ | |
3408 | if (S_ISDIR(inode->i_mode)) { | |
3409 | /* | |
3410 | * If this is a new directory and the label was | |
3411 | * transmuted when the inode was initialized | |
3412 | * set the transmute attribute on the directory | |
3413 | * and mark the inode. | |
3414 | * | |
3415 | * If there is a transmute attribute on the | |
3416 | * directory mark the inode. | |
3417 | */ | |
3418 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3419 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
c7c7a1a1 | 3420 | rc = __vfs_setxattr(&init_user_ns, dp, inode, |
5c6d1125 | 3421 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3422 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3423 | 0); | |
3424 | } else { | |
5d6c3191 | 3425 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3426 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3427 | TRANS_TRUE_SIZE); | |
3428 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3429 | TRANS_TRUE_SIZE) != 0) | |
3430 | rc = -EINVAL; | |
5c6d1125 | 3431 | } |
2267b13a CS |
3432 | if (rc >= 0) |
3433 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3434 | } |
809c02e0 SF |
3435 | /* |
3436 | * Don't let the exec or mmap label be "*" or "@". | |
3437 | */ | |
3438 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3439 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3440 | skp == &smack_known_web) | |
3441 | skp = NULL; | |
3442 | isp->smk_task = skp; | |
e774ad68 | 3443 | |
19760ad0 | 3444 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3445 | if (IS_ERR(skp) || skp == &smack_known_star || |
3446 | skp == &smack_known_web) | |
19760ad0 CS |
3447 | skp = NULL; |
3448 | isp->smk_mmap = skp; | |
676dac4b | 3449 | |
e114e473 CS |
3450 | dput(dp); |
3451 | break; | |
3452 | } | |
3453 | ||
3454 | if (final == NULL) | |
21c7eae2 | 3455 | isp->smk_inode = ckp; |
e114e473 CS |
3456 | else |
3457 | isp->smk_inode = final; | |
3458 | ||
5c6d1125 | 3459 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 | 3460 | |
e114e473 CS |
3461 | return; |
3462 | } | |
3463 | ||
3464 | /** | |
3465 | * smack_getprocattr - Smack process attribute access | |
3466 | * @p: the object task | |
3467 | * @name: the name of the attribute in /proc/.../attr | |
3468 | * @value: where to put the result | |
3469 | * | |
3470 | * Places a copy of the task Smack into value | |
3471 | * | |
3472 | * Returns the length of the smack label or an error code | |
3473 | */ | |
3474 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3475 | { | |
a3727a8b | 3476 | struct smack_known *skp = smk_of_task_struct_obj(p); |
e114e473 CS |
3477 | char *cp; |
3478 | int slen; | |
3479 | ||
3480 | if (strcmp(name, "current") != 0) | |
3481 | return -EINVAL; | |
3482 | ||
2f823ff8 | 3483 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3484 | if (cp == NULL) |
3485 | return -ENOMEM; | |
3486 | ||
3487 | slen = strlen(cp); | |
3488 | *value = cp; | |
3489 | return slen; | |
3490 | } | |
3491 | ||
3492 | /** | |
3493 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3494 | * @name: the name of the attribute in /proc/.../attr |
3495 | * @value: the value to set | |
3496 | * @size: the size of the value | |
3497 | * | |
3498 | * Sets the Smack value of the task. Only setting self | |
3499 | * is permitted and only with privilege | |
3500 | * | |
3501 | * Returns the length of the smack label or an error code | |
3502 | */ | |
b21507e2 | 3503 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3504 | { |
b17103a8 | 3505 | struct task_smack *tsp = smack_cred(current_cred()); |
d84f4f99 | 3506 | struct cred *new; |
2f823ff8 | 3507 | struct smack_known *skp; |
38416e53 ZJ |
3508 | struct smack_known_list_elem *sklep; |
3509 | int rc; | |
e114e473 | 3510 | |
6afcff0a CS |
3511 | /* |
3512 | * Allow the /proc/.../attr/current and SO_PEERSEC "display" | |
3513 | * to be reset at will. | |
3514 | */ | |
3515 | if (strcmp(name, "display") == 0) | |
3516 | return 0; | |
3517 | ||
38416e53 | 3518 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3519 | return -EPERM; |
3520 | ||
f7112e6c | 3521 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3522 | return -EINVAL; |
3523 | ||
3524 | if (strcmp(name, "current") != 0) | |
3525 | return -EINVAL; | |
3526 | ||
2f823ff8 | 3527 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3528 | if (IS_ERR(skp)) |
3529 | return PTR_ERR(skp); | |
e114e473 | 3530 | |
6d3dc07c | 3531 | /* |
7128ea15 HS |
3532 | * No process is ever allowed the web ("@") label |
3533 | * and the star ("*") label. | |
6d3dc07c | 3534 | */ |
7128ea15 HS |
3535 | if (skp == &smack_known_web || skp == &smack_known_star) |
3536 | return -EINVAL; | |
6d3dc07c | 3537 | |
38416e53 ZJ |
3538 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3539 | rc = -EPERM; | |
3540 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3541 | if (sklep->smk_label == skp) { | |
3542 | rc = 0; | |
3543 | break; | |
3544 | } | |
3545 | if (rc) | |
3546 | return rc; | |
3547 | } | |
3548 | ||
d84f4f99 | 3549 | new = prepare_creds(); |
6d3dc07c | 3550 | if (new == NULL) |
d84f4f99 | 3551 | return -ENOMEM; |
7898e1f8 | 3552 | |
b17103a8 | 3553 | tsp = smack_cred(new); |
2f823ff8 | 3554 | tsp->smk_task = skp; |
38416e53 ZJ |
3555 | /* |
3556 | * process can change its label only once | |
3557 | */ | |
3558 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3559 | |
d84f4f99 | 3560 | commit_creds(new); |
e114e473 CS |
3561 | return size; |
3562 | } | |
3563 | ||
3564 | /** | |
3565 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3566 | * @sock: one sock |
3567 | * @other: the other sock | |
e114e473 CS |
3568 | * @newsk: unused |
3569 | * | |
3570 | * Return 0 if a subject with the smack of sock could access | |
3571 | * an object with the smack of other, otherwise an error code | |
3572 | */ | |
3610cda5 DM |
3573 | static int smack_unix_stream_connect(struct sock *sock, |
3574 | struct sock *other, struct sock *newsk) | |
e114e473 | 3575 | { |
2f823ff8 | 3576 | struct smack_known *skp; |
54e70ec5 | 3577 | struct smack_known *okp; |
12ddb08a CS |
3578 | struct socket_smack *ssp = smack_sock(sock); |
3579 | struct socket_smack *osp = smack_sock(other); | |
3580 | struct socket_smack *nsp = smack_sock(newsk); | |
ecfcc53f | 3581 | struct smk_audit_info ad; |
b4e0d5f0 | 3582 | int rc = 0; |
923e9a13 KC |
3583 | #ifdef CONFIG_AUDIT |
3584 | struct lsm_network_audit net; | |
923e9a13 | 3585 | #endif |
b4e0d5f0 | 3586 | |
2f823ff8 CS |
3587 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3588 | skp = ssp->smk_out; | |
96be7b54 | 3589 | okp = osp->smk_in; |
54e70ec5 CS |
3590 | #ifdef CONFIG_AUDIT |
3591 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3592 | smk_ad_setfield_u_net_sk(&ad, other); | |
3593 | #endif | |
21c7eae2 LP |
3594 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3595 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3596 | if (rc == 0) { |
96be7b54 ZJ |
3597 | okp = osp->smk_out; |
3598 | skp = ssp->smk_in; | |
138a868f | 3599 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3600 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3601 | MAY_WRITE, rc); |
3602 | } | |
2f823ff8 | 3603 | } |
b4e0d5f0 | 3604 | |
975d5e55 CS |
3605 | /* |
3606 | * Cross reference the peer labels for SO_PEERSEC. | |
3607 | */ | |
3608 | if (rc == 0) { | |
54e70ec5 CS |
3609 | nsp->smk_packet = ssp->smk_out; |
3610 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3611 | } |
3612 | ||
b4e0d5f0 | 3613 | return rc; |
e114e473 CS |
3614 | } |
3615 | ||
3616 | /** | |
3617 | * smack_unix_may_send - Smack access on UDS | |
3618 | * @sock: one socket | |
3619 | * @other: the other socket | |
3620 | * | |
3621 | * Return 0 if a subject with the smack of sock could access | |
3622 | * an object with the smack of other, otherwise an error code | |
3623 | */ | |
3624 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3625 | { | |
12ddb08a CS |
3626 | struct socket_smack *ssp = smack_sock(sock->sk); |
3627 | struct socket_smack *osp = smack_sock(other->sk); | |
ecfcc53f | 3628 | struct smk_audit_info ad; |
d166c802 | 3629 | int rc; |
e114e473 | 3630 | |
923e9a13 KC |
3631 | #ifdef CONFIG_AUDIT |
3632 | struct lsm_network_audit net; | |
3633 | ||
48c62af6 | 3634 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3635 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3636 | #endif |
b4e0d5f0 | 3637 | |
2f823ff8 CS |
3638 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3639 | return 0; | |
b4e0d5f0 | 3640 | |
21c7eae2 LP |
3641 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3642 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3643 | return rc; |
e114e473 CS |
3644 | } |
3645 | ||
6d3dc07c CS |
3646 | /** |
3647 | * smack_socket_sendmsg - Smack check based on destination host | |
3648 | * @sock: the socket | |
251a2a95 | 3649 | * @msg: the message |
6d3dc07c CS |
3650 | * @size: the size of the message |
3651 | * | |
c6739443 CS |
3652 | * Return 0 if the current subject can write to the destination host. |
3653 | * For IPv4 this is only a question if the destination is a single label host. | |
3654 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3655 | */ |
3656 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3657 | int size) | |
3658 | { | |
3659 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3660 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3661 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3662 | #endif |
3663 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
12ddb08a | 3664 | struct socket_smack *ssp = smack_sock(sock->sk); |
21abb1ec CS |
3665 | struct smack_known *rsp; |
3666 | #endif | |
c6739443 | 3667 | int rc = 0; |
6d3dc07c CS |
3668 | |
3669 | /* | |
3670 | * Perfectly reasonable for this to be NULL | |
3671 | */ | |
c6739443 | 3672 | if (sip == NULL) |
6d3dc07c CS |
3673 | return 0; |
3674 | ||
81bd0d56 | 3675 | switch (sock->sk->sk_family) { |
c6739443 | 3676 | case AF_INET: |
b9ef5513 TH |
3677 | if (msg->msg_namelen < sizeof(struct sockaddr_in) || |
3678 | sip->sin_family != AF_INET) | |
3679 | return -EINVAL; | |
a2af0318 | 3680 | rc = smk_ipv4_check(sock->sk, sip); |
c6739443 | 3681 | break; |
619ae03e | 3682 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3683 | case AF_INET6: |
b9ef5513 TH |
3684 | if (msg->msg_namelen < SIN6_LEN_RFC2133 || |
3685 | sap->sin6_family != AF_INET6) | |
3686 | return -EINVAL; | |
21abb1ec CS |
3687 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3688 | rsp = smack_ipv6host_label(sap); | |
3689 | if (rsp != NULL) | |
3690 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3691 | SMK_CONNECTING); | |
3692 | #endif | |
3693 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3694 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3695 | #endif |
619ae03e | 3696 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
c6739443 CS |
3697 | break; |
3698 | } | |
3699 | return rc; | |
6d3dc07c CS |
3700 | } |
3701 | ||
e114e473 | 3702 | /** |
251a2a95 | 3703 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3704 | * @sap: netlabel secattr |
272cd7a8 | 3705 | * @ssp: socket security information |
e114e473 | 3706 | * |
2f823ff8 | 3707 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3708 | */ |
2f823ff8 CS |
3709 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3710 | struct socket_smack *ssp) | |
e114e473 | 3711 | { |
2f823ff8 | 3712 | struct smack_known *skp; |
f7112e6c | 3713 | int found = 0; |
677264e8 CS |
3714 | int acat; |
3715 | int kcat; | |
e114e473 | 3716 | |
322dd63c CS |
3717 | /* |
3718 | * Netlabel found it in the cache. | |
3719 | */ | |
3720 | if ((sap->flags & NETLBL_SECATTR_CACHE) != 0) | |
3721 | return (struct smack_known *)sap->cache->data; | |
3722 | ||
3723 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) | |
3724 | /* | |
3725 | * Looks like a fallback, which gives us a secid. | |
3726 | */ | |
3727 | return smack_from_secid(sap->attr.secid); | |
3728 | ||
6d3dc07c | 3729 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3730 | /* |
6d3dc07c | 3731 | * Looks like a CIPSO packet. |
e114e473 CS |
3732 | * If there are flags but no level netlabel isn't |
3733 | * behaving the way we expect it to. | |
3734 | * | |
f7112e6c | 3735 | * Look it up in the label table |
e114e473 CS |
3736 | * Without guidance regarding the smack value |
3737 | * for the packet fall back on the network | |
3738 | * ambient value. | |
3739 | */ | |
f7112e6c | 3740 | rcu_read_lock(); |
348dc288 | 3741 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3742 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3743 | continue; |
677264e8 CS |
3744 | /* |
3745 | * Compare the catsets. Use the netlbl APIs. | |
3746 | */ | |
3747 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3748 | if ((skp->smk_netlabel.flags & | |
3749 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3750 | found = 1; | |
3751 | break; | |
3752 | } | |
3753 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3754 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3755 | acat + 1); | |
3756 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3757 | skp->smk_netlabel.attr.mls.cat, |
3758 | kcat + 1); | |
3759 | if (acat < 0 || kcat < 0) | |
3760 | break; | |
3761 | } | |
3762 | if (acat == kcat) { | |
3763 | found = 1; | |
3764 | break; | |
3765 | } | |
6d3dc07c | 3766 | } |
f7112e6c CS |
3767 | rcu_read_unlock(); |
3768 | ||
3769 | if (found) | |
2f823ff8 | 3770 | return skp; |
f7112e6c | 3771 | |
54e70ec5 | 3772 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3773 | return &smack_known_web; |
3774 | return &smack_known_star; | |
e114e473 | 3775 | } |
e114e473 | 3776 | /* |
6d3dc07c CS |
3777 | * Without guidance regarding the smack value |
3778 | * for the packet fall back on the network | |
3779 | * ambient value. | |
e114e473 | 3780 | */ |
272cd7a8 | 3781 | return smack_net_ambient; |
e114e473 CS |
3782 | } |
3783 | ||
69f287ae | 3784 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3785 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3786 | { |
c6739443 CS |
3787 | u8 nexthdr; |
3788 | int offset; | |
3789 | int proto = -EINVAL; | |
3790 | struct ipv6hdr _ipv6h; | |
3791 | struct ipv6hdr *ip6; | |
3792 | __be16 frag_off; | |
3793 | struct tcphdr _tcph, *th; | |
3794 | struct udphdr _udph, *uh; | |
3795 | struct dccp_hdr _dccph, *dh; | |
3796 | ||
3797 | sip->sin6_port = 0; | |
3798 | ||
3799 | offset = skb_network_offset(skb); | |
3800 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3801 | if (ip6 == NULL) | |
3802 | return -EINVAL; | |
3803 | sip->sin6_addr = ip6->saddr; | |
3804 | ||
3805 | nexthdr = ip6->nexthdr; | |
3806 | offset += sizeof(_ipv6h); | |
3807 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3808 | if (offset < 0) | |
3809 | return -EINVAL; | |
3810 | ||
3811 | proto = nexthdr; | |
3812 | switch (proto) { | |
3813 | case IPPROTO_TCP: | |
3814 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3815 | if (th != NULL) | |
3816 | sip->sin6_port = th->source; | |
3817 | break; | |
3818 | case IPPROTO_UDP: | |
a07ef951 | 3819 | case IPPROTO_UDPLITE: |
c6739443 CS |
3820 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3821 | if (uh != NULL) | |
3822 | sip->sin6_port = uh->source; | |
3823 | break; | |
3824 | case IPPROTO_DCCP: | |
3825 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3826 | if (dh != NULL) | |
3827 | sip->sin6_port = dh->dccph_sport; | |
3828 | break; | |
3829 | } | |
3830 | return proto; | |
3831 | } | |
69f287ae | 3832 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3833 | |
36be8129 CS |
3834 | /** |
3835 | * smack_from_skb - Smack data from the secmark in an skb | |
3836 | * @skb: packet | |
3837 | * | |
3838 | * Returns smack_known of the secmark or NULL if that won't work. | |
3839 | */ | |
bf0afe67 | 3840 | #ifdef CONFIG_NETWORK_SECMARK |
36be8129 CS |
3841 | static struct smack_known *smack_from_skb(struct sk_buff *skb) |
3842 | { | |
3843 | if (skb == NULL || skb->secmark == 0) | |
3844 | return NULL; | |
3845 | ||
3846 | return smack_from_secid(skb->secmark); | |
3847 | } | |
bf0afe67 CS |
3848 | #else |
3849 | static inline struct smack_known *smack_from_skb(struct sk_buff *skb) | |
3850 | { | |
3851 | return NULL; | |
3852 | } | |
3853 | #endif | |
36be8129 | 3854 | |
a2af0318 CS |
3855 | /** |
3856 | * smack_from_netlbl - Smack data from the IP options in an skb | |
3857 | * @sk: socket data came in on | |
3858 | * @family: address family | |
3859 | * @skb: packet | |
3860 | * | |
322dd63c CS |
3861 | * Find the Smack label in the IP options. If it hasn't been |
3862 | * added to the netlabel cache, add it here. | |
3863 | * | |
a2af0318 CS |
3864 | * Returns smack_known of the IP options or NULL if that won't work. |
3865 | */ | |
41dd9596 | 3866 | static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family, |
a2af0318 CS |
3867 | struct sk_buff *skb) |
3868 | { | |
3869 | struct netlbl_lsm_secattr secattr; | |
3870 | struct socket_smack *ssp = NULL; | |
3871 | struct smack_known *skp = NULL; | |
3872 | ||
3873 | netlbl_secattr_init(&secattr); | |
3874 | ||
3875 | if (sk) | |
3876 | ssp = sk->sk_security; | |
322dd63c CS |
3877 | |
3878 | if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) { | |
a2af0318 | 3879 | skp = smack_from_secattr(&secattr, ssp); |
322dd63c | 3880 | if (secattr.flags & NETLBL_SECATTR_CACHEABLE) |
9b0072e2 | 3881 | netlbl_cache_add(skb, family, &skp->smk_netlabel); |
322dd63c | 3882 | } |
a2af0318 CS |
3883 | |
3884 | netlbl_secattr_destroy(&secattr); | |
3885 | ||
3886 | return skp; | |
3887 | } | |
3888 | ||
e114e473 CS |
3889 | /** |
3890 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3891 | * @sk: socket | |
3892 | * @skb: packet | |
3893 | * | |
3894 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3895 | */ | |
3896 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3897 | { | |
12ddb08a | 3898 | struct socket_smack *ssp = smack_sock(sk); |
69f287ae | 3899 | struct smack_known *skp = NULL; |
c6739443 | 3900 | int rc = 0; |
ecfcc53f | 3901 | struct smk_audit_info ad; |
129a9989 | 3902 | u16 family = sk->sk_family; |
923e9a13 | 3903 | #ifdef CONFIG_AUDIT |
48c62af6 | 3904 | struct lsm_network_audit net; |
923e9a13 | 3905 | #endif |
69f287ae CS |
3906 | #if IS_ENABLED(CONFIG_IPV6) |
3907 | struct sockaddr_in6 sadd; | |
3908 | int proto; | |
129a9989 PS |
3909 | |
3910 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3911 | family = PF_INET; | |
69f287ae CS |
3912 | #endif /* CONFIG_IPV6 */ |
3913 | ||
129a9989 | 3914 | switch (family) { |
c6739443 | 3915 | case PF_INET: |
69f287ae CS |
3916 | /* |
3917 | * If there is a secmark use it rather than the CIPSO label. | |
3918 | * If there is no secmark fall back to CIPSO. | |
3919 | * The secmark is assumed to reflect policy better. | |
3920 | */ | |
36be8129 | 3921 | skp = smack_from_skb(skb); |
a2af0318 CS |
3922 | if (skp == NULL) { |
3923 | skp = smack_from_netlbl(sk, family, skb); | |
3924 | if (skp == NULL) | |
3925 | skp = smack_net_ambient; | |
69f287ae | 3926 | } |
6d3dc07c | 3927 | |
ecfcc53f | 3928 | #ifdef CONFIG_AUDIT |
c6739443 | 3929 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 3930 | ad.a.u.net->family = family; |
c6739443 CS |
3931 | ad.a.u.net->netif = skb->skb_iif; |
3932 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3933 | #endif |
c6739443 CS |
3934 | /* |
3935 | * Receiving a packet requires that the other end | |
3936 | * be able to write here. Read access is not required. | |
3937 | * This is the simplist possible security model | |
3938 | * for networking. | |
3939 | */ | |
21c7eae2 LP |
3940 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3941 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3942 | MAY_WRITE, rc); |
c6739443 | 3943 | if (rc != 0) |
129a9989 | 3944 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 3945 | break; |
69f287ae | 3946 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3947 | case PF_INET6: |
69f287ae | 3948 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
3949 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
3950 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 3951 | break; |
21abb1ec | 3952 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
3953 | skp = smack_from_skb(skb); |
3954 | if (skp == NULL) { | |
3955 | if (smk_ipv6_localhost(&sadd)) | |
3956 | break; | |
21abb1ec | 3957 | skp = smack_ipv6host_label(&sadd); |
36be8129 CS |
3958 | if (skp == NULL) |
3959 | skp = smack_net_ambient; | |
3960 | } | |
69f287ae CS |
3961 | #ifdef CONFIG_AUDIT |
3962 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 3963 | ad.a.u.net->family = family; |
69f287ae CS |
3964 | ad.a.u.net->netif = skb->skb_iif; |
3965 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
3966 | #endif /* CONFIG_AUDIT */ | |
3967 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
3968 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
3969 | MAY_WRITE, rc); | |
21abb1ec CS |
3970 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
3971 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 3972 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 3973 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
3974 | if (rc != 0) |
3975 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3976 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 3977 | break; |
69f287ae | 3978 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3979 | } |
69f287ae | 3980 | |
a8134296 | 3981 | return rc; |
e114e473 CS |
3982 | } |
3983 | ||
3984 | /** | |
3985 | * smack_socket_getpeersec_stream - pull in packet label | |
3986 | * @sock: the socket | |
3987 | * @optval: user's destination | |
3988 | * @optlen: size thereof | |
251a2a95 | 3989 | * @len: max thereof |
e114e473 CS |
3990 | * |
3991 | * returns zero on success, an error code otherwise | |
3992 | */ | |
3993 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3994 | char __user *optval, | |
3995 | int __user *optlen, unsigned len) | |
3996 | { | |
3997 | struct socket_smack *ssp; | |
272cd7a8 CS |
3998 | char *rcp = ""; |
3999 | int slen = 1; | |
e114e473 CS |
4000 | int rc = 0; |
4001 | ||
12ddb08a | 4002 | ssp = smack_sock(sock->sk); |
272cd7a8 | 4003 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4004 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4005 | slen = strlen(rcp) + 1; |
4006 | } | |
e114e473 CS |
4007 | |
4008 | if (slen > len) | |
4009 | rc = -ERANGE; | |
272cd7a8 | 4010 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4011 | rc = -EFAULT; |
4012 | ||
4013 | if (put_user(slen, optlen) != 0) | |
4014 | rc = -EFAULT; | |
4015 | ||
4016 | return rc; | |
4017 | } | |
4018 | ||
4019 | ||
4020 | /** | |
4021 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4022 | * @sock: the peer socket |
e114e473 CS |
4023 | * @skb: packet data |
4024 | * @secid: pointer to where to put the secid of the packet | |
4025 | * | |
4026 | * Sets the netlabel socket state on sk from parent | |
4027 | */ | |
4028 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4029 | struct sk_buff *skb, u32 *secid) | |
4030 | ||
4031 | { | |
272cd7a8 | 4032 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4033 | struct smack_known *skp; |
a2af0318 | 4034 | struct sock *sk = NULL; |
b4e0d5f0 CS |
4035 | int family = PF_UNSPEC; |
4036 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 | 4037 | |
b4e0d5f0 CS |
4038 | if (skb != NULL) { |
4039 | if (skb->protocol == htons(ETH_P_IP)) | |
4040 | family = PF_INET; | |
69f287ae | 4041 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4042 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4043 | family = PF_INET6; | |
69f287ae | 4044 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4045 | } |
b4e0d5f0 CS |
4046 | if (family == PF_UNSPEC && sock != NULL) |
4047 | family = sock->sk->sk_family; | |
e114e473 | 4048 | |
69f287ae CS |
4049 | switch (family) { |
4050 | case PF_UNIX: | |
12ddb08a | 4051 | ssp = smack_sock(sock->sk); |
2f823ff8 | 4052 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4053 | break; |
4054 | case PF_INET: | |
36be8129 CS |
4055 | skp = smack_from_skb(skb); |
4056 | if (skp) { | |
4057 | s = skp->smk_secid; | |
69f287ae | 4058 | break; |
36be8129 | 4059 | } |
b4e0d5f0 CS |
4060 | /* |
4061 | * Translate what netlabel gave us. | |
4062 | */ | |
a2af0318 CS |
4063 | if (sock != NULL) |
4064 | sk = sock->sk; | |
4065 | skp = smack_from_netlbl(sk, family, skb); | |
4066 | if (skp != NULL) | |
2f823ff8 | 4067 | s = skp->smk_secid; |
69f287ae | 4068 | break; |
69f287ae | 4069 | case PF_INET6: |
21abb1ec | 4070 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
4071 | skp = smack_from_skb(skb); |
4072 | if (skp) | |
4073 | s = skp->smk_secid; | |
21abb1ec | 4074 | #endif |
69f287ae | 4075 | break; |
b4e0d5f0 CS |
4076 | } |
4077 | *secid = s; | |
e114e473 CS |
4078 | if (s == 0) |
4079 | return -EINVAL; | |
e114e473 CS |
4080 | return 0; |
4081 | } | |
4082 | ||
4083 | /** | |
07feee8f PM |
4084 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4085 | * @sk: child sock | |
4086 | * @parent: parent socket | |
e114e473 | 4087 | * |
07feee8f PM |
4088 | * Set the smk_{in,out} state of an existing sock based on the process that |
4089 | * is creating the new socket. | |
e114e473 CS |
4090 | */ |
4091 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4092 | { | |
4093 | struct socket_smack *ssp; | |
2f823ff8 | 4094 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4095 | |
07feee8f PM |
4096 | if (sk == NULL || |
4097 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4098 | return; |
4099 | ||
12ddb08a | 4100 | ssp = smack_sock(sk); |
54e70ec5 | 4101 | ssp->smk_in = skp; |
2f823ff8 | 4102 | ssp->smk_out = skp; |
07feee8f | 4103 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4104 | } |
4105 | ||
4106 | /** | |
4107 | * smack_inet_conn_request - Smack access check on connect | |
4108 | * @sk: socket involved | |
4109 | * @skb: packet | |
4110 | * @req: unused | |
4111 | * | |
4112 | * Returns 0 if a task with the packet label could write to | |
4113 | * the socket, otherwise an error code | |
4114 | */ | |
41dd9596 | 4115 | static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb, |
e114e473 CS |
4116 | struct request_sock *req) |
4117 | { | |
07feee8f | 4118 | u16 family = sk->sk_family; |
f7112e6c | 4119 | struct smack_known *skp; |
12ddb08a | 4120 | struct socket_smack *ssp = smack_sock(sk); |
07feee8f PM |
4121 | struct sockaddr_in addr; |
4122 | struct iphdr *hdr; | |
21c7eae2 | 4123 | struct smack_known *hskp; |
e114e473 | 4124 | int rc; |
ecfcc53f | 4125 | struct smk_audit_info ad; |
923e9a13 | 4126 | #ifdef CONFIG_AUDIT |
48c62af6 | 4127 | struct lsm_network_audit net; |
923e9a13 | 4128 | #endif |
e114e473 | 4129 | |
69f287ae | 4130 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4131 | if (family == PF_INET6) { |
4132 | /* | |
4133 | * Handle mapped IPv4 packets arriving | |
4134 | * via IPv6 sockets. Don't set up netlabel | |
4135 | * processing on IPv6. | |
4136 | */ | |
4137 | if (skb->protocol == htons(ETH_P_IP)) | |
4138 | family = PF_INET; | |
4139 | else | |
4140 | return 0; | |
4141 | } | |
69f287ae | 4142 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4143 | |
7f368ad3 CS |
4144 | /* |
4145 | * If there is a secmark use it rather than the CIPSO label. | |
4146 | * If there is no secmark fall back to CIPSO. | |
4147 | * The secmark is assumed to reflect policy better. | |
4148 | */ | |
36be8129 | 4149 | skp = smack_from_skb(skb); |
a2af0318 CS |
4150 | if (skp == NULL) { |
4151 | skp = smack_from_netlbl(sk, family, skb); | |
4152 | if (skp == NULL) | |
4153 | skp = &smack_known_huh; | |
7f368ad3 | 4154 | } |
7f368ad3 | 4155 | |
ecfcc53f | 4156 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4157 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4158 | ad.a.u.net->family = family; | |
4159 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4160 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4161 | #endif | |
e114e473 | 4162 | /* |
07feee8f PM |
4163 | * Receiving a packet requires that the other end be able to write |
4164 | * here. Read access is not required. | |
e114e473 | 4165 | */ |
21c7eae2 LP |
4166 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4167 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4168 | if (rc != 0) |
4169 | return rc; | |
4170 | ||
4171 | /* | |
4172 | * Save the peer's label in the request_sock so we can later setup | |
4173 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4174 | */ | |
2f823ff8 | 4175 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4176 | |
4177 | /* | |
4178 | * We need to decide if we want to label the incoming connection here | |
4179 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4180 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4181 | */ |
4182 | hdr = ip_hdr(skb); | |
4183 | addr.sin_addr.s_addr = hdr->saddr; | |
4184 | rcu_read_lock(); | |
21abb1ec | 4185 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4186 | rcu_read_unlock(); |
4187 | ||
21c7eae2 | 4188 | if (hskp == NULL) |
f7112e6c | 4189 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4190 | else |
07feee8f | 4191 | netlbl_req_delattr(req); |
e114e473 CS |
4192 | |
4193 | return rc; | |
4194 | } | |
4195 | ||
07feee8f PM |
4196 | /** |
4197 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4198 | * @sk: the new socket | |
4199 | * @req: the connection's request_sock | |
4200 | * | |
4201 | * Transfer the connection's peer label to the newly created socket. | |
4202 | */ | |
4203 | static void smack_inet_csk_clone(struct sock *sk, | |
4204 | const struct request_sock *req) | |
4205 | { | |
12ddb08a | 4206 | struct socket_smack *ssp = smack_sock(sk); |
2f823ff8 | 4207 | struct smack_known *skp; |
07feee8f | 4208 | |
2f823ff8 CS |
4209 | if (req->peer_secid != 0) { |
4210 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4211 | ssp->smk_packet = skp; |
2f823ff8 | 4212 | } else |
272cd7a8 | 4213 | ssp->smk_packet = NULL; |
07feee8f PM |
4214 | } |
4215 | ||
e114e473 CS |
4216 | /* |
4217 | * Key management security hooks | |
4218 | * | |
4219 | * Casey has not tested key support very heavily. | |
4220 | * The permission check is most likely too restrictive. | |
4221 | * If you care about keys please have a look. | |
4222 | */ | |
4223 | #ifdef CONFIG_KEYS | |
4224 | ||
4225 | /** | |
4226 | * smack_key_alloc - Set the key security blob | |
4227 | * @key: object | |
d84f4f99 | 4228 | * @cred: the credentials to use |
e114e473 CS |
4229 | * @flags: unused |
4230 | * | |
4231 | * No allocation required | |
4232 | * | |
4233 | * Returns 0 | |
4234 | */ | |
d84f4f99 | 4235 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4236 | unsigned long flags) |
4237 | { | |
b17103a8 | 4238 | struct smack_known *skp = smk_of_task(smack_cred(cred)); |
2f823ff8 | 4239 | |
21c7eae2 | 4240 | key->security = skp; |
e114e473 CS |
4241 | return 0; |
4242 | } | |
4243 | ||
4244 | /** | |
4245 | * smack_key_free - Clear the key security blob | |
4246 | * @key: the object | |
4247 | * | |
4248 | * Clear the blob pointer | |
4249 | */ | |
4250 | static void smack_key_free(struct key *key) | |
4251 | { | |
4252 | key->security = NULL; | |
4253 | } | |
4254 | ||
1a28979b | 4255 | /** |
e114e473 CS |
4256 | * smack_key_permission - Smack access on a key |
4257 | * @key_ref: gets to the object | |
d84f4f99 | 4258 | * @cred: the credentials to use |
8c0637e9 | 4259 | * @need_perm: requested key permission |
e114e473 CS |
4260 | * |
4261 | * Return 0 if the task has read and write to the object, | |
4262 | * an error code otherwise | |
4263 | */ | |
4264 | static int smack_key_permission(key_ref_t key_ref, | |
8c0637e9 DH |
4265 | const struct cred *cred, |
4266 | enum key_need_perm need_perm) | |
e114e473 CS |
4267 | { |
4268 | struct key *keyp; | |
ecfcc53f | 4269 | struct smk_audit_info ad; |
b17103a8 | 4270 | struct smack_known *tkp = smk_of_task(smack_cred(cred)); |
fffea214 | 4271 | int request = 0; |
d166c802 | 4272 | int rc; |
e114e473 | 4273 | |
5b841bfa ZM |
4274 | /* |
4275 | * Validate requested permissions | |
4276 | */ | |
8c0637e9 DH |
4277 | switch (need_perm) { |
4278 | case KEY_NEED_READ: | |
4279 | case KEY_NEED_SEARCH: | |
4280 | case KEY_NEED_VIEW: | |
4281 | request |= MAY_READ; | |
4282 | break; | |
4283 | case KEY_NEED_WRITE: | |
4284 | case KEY_NEED_LINK: | |
4285 | case KEY_NEED_SETATTR: | |
4286 | request |= MAY_WRITE; | |
4287 | break; | |
4288 | case KEY_NEED_UNSPECIFIED: | |
4289 | case KEY_NEED_UNLINK: | |
4290 | case KEY_SYSADMIN_OVERRIDE: | |
4291 | case KEY_AUTHTOKEN_OVERRIDE: | |
4292 | case KEY_DEFER_PERM_CHECK: | |
4293 | return 0; | |
4294 | default: | |
5b841bfa | 4295 | return -EINVAL; |
8c0637e9 | 4296 | } |
5b841bfa | 4297 | |
e114e473 CS |
4298 | keyp = key_ref_to_ptr(key_ref); |
4299 | if (keyp == NULL) | |
4300 | return -EINVAL; | |
4301 | /* | |
4302 | * If the key hasn't been initialized give it access so that | |
4303 | * it may do so. | |
4304 | */ | |
4305 | if (keyp->security == NULL) | |
4306 | return 0; | |
4307 | /* | |
4308 | * This should not occur | |
4309 | */ | |
2f823ff8 | 4310 | if (tkp == NULL) |
e114e473 | 4311 | return -EACCES; |
d19dfe58 | 4312 | |
a8478a60 | 4313 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
d19dfe58 CS |
4314 | return 0; |
4315 | ||
ecfcc53f EB |
4316 | #ifdef CONFIG_AUDIT |
4317 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4318 | ad.a.u.key_struct.key = keyp->serial; | |
4319 | ad.a.u.key_struct.key_desc = keyp->description; | |
4320 | #endif | |
d166c802 CS |
4321 | rc = smk_access(tkp, keyp->security, request, &ad); |
4322 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4323 | return rc; | |
e114e473 | 4324 | } |
7fc5f36e JB |
4325 | |
4326 | /* | |
4327 | * smack_key_getsecurity - Smack label tagging the key | |
4328 | * @key points to the key to be queried | |
4329 | * @_buffer points to a pointer that should be set to point to the | |
4330 | * resulting string (if no label or an error occurs). | |
4331 | * Return the length of the string (including terminating NUL) or -ve if | |
4332 | * an error. | |
4333 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4334 | */ | |
4335 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4336 | { | |
4337 | struct smack_known *skp = key->security; | |
4338 | size_t length; | |
4339 | char *copy; | |
4340 | ||
4341 | if (key->security == NULL) { | |
4342 | *_buffer = NULL; | |
4343 | return 0; | |
4344 | } | |
4345 | ||
4346 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4347 | if (copy == NULL) | |
4348 | return -ENOMEM; | |
4349 | length = strlen(copy) + 1; | |
4350 | ||
4351 | *_buffer = copy; | |
4352 | return length; | |
4353 | } | |
4354 | ||
a8478a60 DH |
4355 | |
4356 | #ifdef CONFIG_KEY_NOTIFICATIONS | |
4357 | /** | |
4358 | * smack_watch_key - Smack access to watch a key for notifications. | |
4359 | * @key: The key to be watched | |
4360 | * | |
4361 | * Return 0 if the @watch->cred has permission to read from the key object and | |
4362 | * an error otherwise. | |
4363 | */ | |
4364 | static int smack_watch_key(struct key *key) | |
4365 | { | |
4366 | struct smk_audit_info ad; | |
4367 | struct smack_known *tkp = smk_of_current(); | |
4368 | int rc; | |
4369 | ||
4370 | if (key == NULL) | |
4371 | return -EINVAL; | |
4372 | /* | |
4373 | * If the key hasn't been initialized give it access so that | |
4374 | * it may do so. | |
4375 | */ | |
4376 | if (key->security == NULL) | |
4377 | return 0; | |
4378 | /* | |
4379 | * This should not occur | |
4380 | */ | |
4381 | if (tkp == NULL) | |
4382 | return -EACCES; | |
4383 | ||
4384 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) | |
4385 | return 0; | |
4386 | ||
4387 | #ifdef CONFIG_AUDIT | |
4388 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4389 | ad.a.u.key_struct.key = key->serial; | |
4390 | ad.a.u.key_struct.key_desc = key->description; | |
4391 | #endif | |
4392 | rc = smk_access(tkp, key->security, MAY_READ, &ad); | |
4393 | rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc); | |
4394 | return rc; | |
4395 | } | |
4396 | #endif /* CONFIG_KEY_NOTIFICATIONS */ | |
e114e473 CS |
4397 | #endif /* CONFIG_KEYS */ |
4398 | ||
a8478a60 DH |
4399 | #ifdef CONFIG_WATCH_QUEUE |
4400 | /** | |
4401 | * smack_post_notification - Smack access to post a notification to a queue | |
4402 | * @w_cred: The credentials of the watcher. | |
4403 | * @cred: The credentials of the event source (may be NULL). | |
4404 | * @n: The notification message to be posted. | |
4405 | */ | |
4406 | static int smack_post_notification(const struct cred *w_cred, | |
4407 | const struct cred *cred, | |
4408 | struct watch_notification *n) | |
4409 | { | |
4410 | struct smk_audit_info ad; | |
4411 | struct smack_known *subj, *obj; | |
4412 | int rc; | |
4413 | ||
4414 | /* Always let maintenance notifications through. */ | |
4415 | if (n->type == WATCH_TYPE_META) | |
4416 | return 0; | |
4417 | ||
4418 | if (!cred) | |
4419 | return 0; | |
4420 | subj = smk_of_task(smack_cred(cred)); | |
4421 | obj = smk_of_task(smack_cred(w_cred)); | |
4422 | ||
4423 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION); | |
4424 | rc = smk_access(subj, obj, MAY_WRITE, &ad); | |
4425 | rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc); | |
4426 | return rc; | |
4427 | } | |
4428 | #endif /* CONFIG_WATCH_QUEUE */ | |
4429 | ||
d20bdda6 AD |
4430 | /* |
4431 | * Smack Audit hooks | |
4432 | * | |
4433 | * Audit requires a unique representation of each Smack specific | |
4434 | * rule. This unique representation is used to distinguish the | |
4435 | * object to be audited from remaining kernel objects and also | |
4436 | * works as a glue between the audit hooks. | |
4437 | * | |
4438 | * Since repository entries are added but never deleted, we'll use | |
4439 | * the smack_known label address related to the given audit rule as | |
4440 | * the needed unique representation. This also better fits the smack | |
4441 | * model where nearly everything is a label. | |
4442 | */ | |
4443 | #ifdef CONFIG_AUDIT | |
4444 | ||
4445 | /** | |
4446 | * smack_audit_rule_init - Initialize a smack audit rule | |
4447 | * @field: audit rule fields given from user-space (audit.h) | |
4448 | * @op: required testing operator (=, !=, >, <, ...) | |
4449 | * @rulestr: smack label to be audited | |
4450 | * @vrule: pointer to save our own audit rule representation | |
4451 | * | |
4452 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4453 | * The label to be audited is created if necessay. | |
4454 | */ | |
4455 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4456 | { | |
21c7eae2 | 4457 | struct smack_known *skp; |
d20bdda6 AD |
4458 | char **rule = (char **)vrule; |
4459 | *rule = NULL; | |
4460 | ||
4461 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4462 | return -EINVAL; | |
4463 | ||
5af75d8d | 4464 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4465 | return -EINVAL; |
4466 | ||
21c7eae2 | 4467 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4468 | if (IS_ERR(skp)) |
4469 | return PTR_ERR(skp); | |
4470 | ||
4471 | *rule = skp->smk_known; | |
d20bdda6 AD |
4472 | |
4473 | return 0; | |
4474 | } | |
4475 | ||
4476 | /** | |
4477 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4478 | * @krule: rule of interest, in Audit kernel representation format | |
4479 | * | |
4480 | * This is used to filter Smack rules from remaining Audit ones. | |
4481 | * If it's proved that this rule belongs to us, the | |
4482 | * audit_rule_match hook will be called to do the final judgement. | |
4483 | */ | |
4484 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4485 | { | |
4486 | struct audit_field *f; | |
4487 | int i; | |
4488 | ||
4489 | for (i = 0; i < krule->field_count; i++) { | |
4490 | f = &krule->fields[i]; | |
4491 | ||
4492 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4493 | return 1; | |
4494 | } | |
4495 | ||
4496 | return 0; | |
4497 | } | |
4498 | ||
4499 | /** | |
4500 | * smack_audit_rule_match - Audit given object ? | |
4501 | * @secid: security id for identifying the object to test | |
4502 | * @field: audit rule flags given from user-space | |
4503 | * @op: required testing operator | |
4504 | * @vrule: smack internal rule presentation | |
d20bdda6 AD |
4505 | * |
4506 | * The core Audit hook. It's used to take the decision of | |
4507 | * whether to audit or not to audit a given object. | |
4508 | */ | |
90462a5b | 4509 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule) |
d20bdda6 | 4510 | { |
2f823ff8 | 4511 | struct smack_known *skp; |
d20bdda6 AD |
4512 | char *rule = vrule; |
4513 | ||
4eb0f4ab RGB |
4514 | if (unlikely(!rule)) { |
4515 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4516 | return -ENOENT; |
4517 | } | |
4518 | ||
4519 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4520 | return 0; | |
4521 | ||
2f823ff8 | 4522 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4523 | |
4524 | /* | |
4525 | * No need to do string comparisons. If a match occurs, | |
4526 | * both pointers will point to the same smack_known | |
4527 | * label. | |
4528 | */ | |
5af75d8d | 4529 | if (op == Audit_equal) |
2f823ff8 | 4530 | return (rule == skp->smk_known); |
5af75d8d | 4531 | if (op == Audit_not_equal) |
2f823ff8 | 4532 | return (rule != skp->smk_known); |
d20bdda6 AD |
4533 | |
4534 | return 0; | |
4535 | } | |
4536 | ||
491a0b08 CS |
4537 | /* |
4538 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4539 | * No memory was allocated. |
4540 | */ | |
d20bdda6 AD |
4541 | |
4542 | #endif /* CONFIG_AUDIT */ | |
4543 | ||
746df9b5 DQ |
4544 | /** |
4545 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4546 | * @name: Full xattr name to check. | |
4547 | */ | |
4548 | static int smack_ismaclabel(const char *name) | |
4549 | { | |
4550 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4551 | } | |
4552 | ||
4553 | ||
251a2a95 | 4554 | /** |
e114e473 CS |
4555 | * smack_secid_to_secctx - return the smack label for a secid |
4556 | * @secid: incoming integer | |
4557 | * @secdata: destination | |
4558 | * @seclen: how long it is | |
4559 | * | |
4560 | * Exists for networking code. | |
4561 | */ | |
4562 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4563 | { | |
2f823ff8 | 4564 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4565 | |
d5630b9d | 4566 | if (secdata) |
2f823ff8 CS |
4567 | *secdata = skp->smk_known; |
4568 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4569 | return 0; |
4570 | } | |
4571 | ||
251a2a95 | 4572 | /** |
4bc87e62 CS |
4573 | * smack_secctx_to_secid - return the secid for a smack label |
4574 | * @secdata: smack label | |
4575 | * @seclen: how long result is | |
4576 | * @secid: outgoing integer | |
4577 | * | |
4578 | * Exists for audit and networking code. | |
4579 | */ | |
e52c1764 | 4580 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4581 | { |
21c7eae2 LP |
4582 | struct smack_known *skp = smk_find_entry(secdata); |
4583 | ||
4584 | if (skp) | |
4585 | *secid = skp->smk_secid; | |
4586 | else | |
4587 | *secid = 0; | |
4bc87e62 CS |
4588 | return 0; |
4589 | } | |
4590 | ||
491a0b08 CS |
4591 | /* |
4592 | * There used to be a smack_release_secctx hook | |
4593 | * that did nothing back when hooks were in a vector. | |
4594 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4595 | */ |
e114e473 | 4596 | |
1ee65e37 DQ |
4597 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4598 | { | |
c7c7a1a1 TA |
4599 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, |
4600 | ctxlen, 0); | |
1ee65e37 DQ |
4601 | } |
4602 | ||
4603 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4604 | { | |
c7c7a1a1 TA |
4605 | return __vfs_setxattr_noperm(&init_user_ns, dentry, XATTR_NAME_SMACK, |
4606 | ctx, ctxlen, 0); | |
1ee65e37 DQ |
4607 | } |
4608 | ||
4609 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4610 | { | |
0f8983cf | 4611 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4612 | |
0f8983cf CS |
4613 | *ctx = skp->smk_known; |
4614 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4615 | return 0; |
4616 | } | |
4617 | ||
d6d80cb5 CS |
4618 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4619 | { | |
4620 | ||
4621 | struct task_smack *tsp; | |
4622 | struct smack_known *skp; | |
4623 | struct inode_smack *isp; | |
4624 | struct cred *new_creds = *new; | |
4625 | ||
4626 | if (new_creds == NULL) { | |
4627 | new_creds = prepare_creds(); | |
4628 | if (new_creds == NULL) | |
4629 | return -ENOMEM; | |
4630 | } | |
4631 | ||
b17103a8 | 4632 | tsp = smack_cred(new_creds); |
d6d80cb5 CS |
4633 | |
4634 | /* | |
4635 | * Get label from overlay inode and set it in create_sid | |
4636 | */ | |
fb4021b6 | 4637 | isp = smack_inode(d_inode(dentry->d_parent)); |
d6d80cb5 CS |
4638 | skp = isp->smk_inode; |
4639 | tsp->smk_task = skp; | |
4640 | *new = new_creds; | |
4641 | return 0; | |
4642 | } | |
4643 | ||
4644 | static int smack_inode_copy_up_xattr(const char *name) | |
4645 | { | |
4646 | /* | |
4647 | * Return 1 if this is the smack access Smack attribute. | |
4648 | */ | |
4649 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4650 | return 1; | |
4651 | ||
4652 | return -EOPNOTSUPP; | |
4653 | } | |
4654 | ||
4655 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4656 | struct qstr *name, | |
4657 | const struct cred *old, | |
4658 | struct cred *new) | |
4659 | { | |
b17103a8 CS |
4660 | struct task_smack *otsp = smack_cred(old); |
4661 | struct task_smack *ntsp = smack_cred(new); | |
d6d80cb5 CS |
4662 | struct inode_smack *isp; |
4663 | int may; | |
4664 | ||
4665 | /* | |
4666 | * Use the process credential unless all of | |
4667 | * the transmuting criteria are met | |
4668 | */ | |
4669 | ntsp->smk_task = otsp->smk_task; | |
4670 | ||
4671 | /* | |
4672 | * the attribute of the containing directory | |
4673 | */ | |
fb4021b6 | 4674 | isp = smack_inode(d_inode(dentry->d_parent)); |
d6d80cb5 CS |
4675 | |
4676 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4677 | rcu_read_lock(); | |
4678 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4679 | isp->smk_inode->smk_known, | |
4680 | &otsp->smk_task->smk_rules); | |
4681 | rcu_read_unlock(); | |
4682 | ||
4683 | /* | |
4684 | * If the directory is transmuting and the rule | |
4685 | * providing access is transmuting use the containing | |
4686 | * directory label instead of the process label. | |
4687 | */ | |
4688 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4689 | ntsp->smk_task = isp->smk_inode; | |
4690 | } | |
4691 | return 0; | |
4692 | } | |
4693 | ||
bbd3662a CS |
4694 | struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = { |
4695 | .lbs_cred = sizeof(struct task_smack), | |
33bf60ca | 4696 | .lbs_file = sizeof(struct smack_known *), |
afb1cbe3 | 4697 | .lbs_inode = sizeof(struct inode_smack), |
ecd5f82e CS |
4698 | .lbs_ipc = sizeof(struct smack_known *), |
4699 | .lbs_msg_msg = sizeof(struct smack_known *), | |
1aea7808 | 4700 | .lbs_superblock = sizeof(struct superblock_smack), |
12ddb08a | 4701 | .lbs_sock = sizeof(struct socket_smack), |
bbd3662a CS |
4702 | }; |
4703 | ||
f17b27a2 CS |
4704 | static struct lsm_id smack_lsmid __lsm_ro_after_init = { |
4705 | .lsm = "smack", | |
4706 | .slot = LSMBLOB_NEEDED | |
4707 | }; | |
4708 | ||
ca97d939 | 4709 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4710 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4711 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4712 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4713 | ||
0b52075e | 4714 | LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup), |
2febd254 DH |
4715 | LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param), |
4716 | ||
e20b043a | 4717 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), |
204cc0cc | 4718 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 4719 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 4720 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 4721 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a | 4722 | |
b8bff599 | 4723 | LSM_HOOK_INIT(bprm_creds_for_exec, smack_bprm_creds_for_exec), |
e20b043a CS |
4724 | |
4725 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
e20b043a CS |
4726 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), |
4727 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4728 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4729 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4730 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4731 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4732 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4733 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4734 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4735 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4736 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4737 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4738 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4739 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4740 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4741 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4742 | ||
e20b043a | 4743 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
e20b043a CS |
4744 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), |
4745 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4746 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4747 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4748 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4749 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4750 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4751 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4752 | ||
4753 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4754 | ||
4755 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4756 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4757 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4758 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4759 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4760 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4761 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4762 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4763 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4764 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
1fb057dc PM |
4765 | LSM_HOOK_INIT(task_getsecid_subj, smack_task_getsecid_subj), |
4766 | LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj), | |
e20b043a CS |
4767 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), |
4768 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4769 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4770 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4771 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4772 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4773 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4774 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4775 | ||
4776 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4777 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4778 | ||
4779 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
e20b043a | 4780 | |
0d79cbf8 | 4781 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4782 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4783 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4784 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4785 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4786 | ||
0d79cbf8 | 4787 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4788 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4789 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4790 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4791 | ||
0d79cbf8 | 4792 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4793 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4794 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4795 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4796 | ||
4797 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4798 | ||
4799 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4800 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4801 | ||
4802 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4803 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4804 | ||
4805 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4806 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4807 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4808 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4809 | #endif |
e20b043a CS |
4810 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4811 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4812 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4813 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4814 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4815 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
12ddb08a | 4816 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4817 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), |
12ddb08a | 4818 | #endif |
e20b043a CS |
4819 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), |
4820 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4821 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4822 | |
e114e473 CS |
4823 | /* key management security hooks */ |
4824 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4825 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4826 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4827 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4828 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
a8478a60 DH |
4829 | #ifdef CONFIG_KEY_NOTIFICATIONS |
4830 | LSM_HOOK_INIT(watch_key, smack_watch_key), | |
4831 | #endif | |
e114e473 | 4832 | #endif /* CONFIG_KEYS */ |
d20bdda6 | 4833 | |
a8478a60 DH |
4834 | #ifdef CONFIG_WATCH_QUEUE |
4835 | LSM_HOOK_INIT(post_notification, smack_post_notification), | |
4836 | #endif | |
4837 | ||
d20bdda6 AD |
4838 | /* Audit hooks */ |
4839 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4840 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4841 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4842 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4843 | #endif /* CONFIG_AUDIT */ |
4844 | ||
e20b043a CS |
4845 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4846 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4847 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4848 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4849 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4850 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4851 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4852 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4853 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4854 | }; |
4855 | ||
7198e2ee | 4856 | |
86812bb0 | 4857 | static __init void init_smack_known_list(void) |
7198e2ee | 4858 | { |
86812bb0 CS |
4859 | /* |
4860 | * Initialize rule list locks | |
4861 | */ | |
4862 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4863 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4864 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4865 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4866 | mutex_init(&smack_known_web.smk_rules_lock); |
4867 | /* | |
4868 | * Initialize rule lists | |
4869 | */ | |
4870 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4871 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4872 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4873 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4874 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4875 | /* | |
4876 | * Create the known labels list | |
4877 | */ | |
4d7cf4a1 TS |
4878 | smk_insert_entry(&smack_known_huh); |
4879 | smk_insert_entry(&smack_known_hat); | |
4880 | smk_insert_entry(&smack_known_star); | |
4881 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4882 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4883 | } |
4884 | ||
e114e473 CS |
4885 | /** |
4886 | * smack_init - initialize the smack system | |
4887 | * | |
a1a07f22 | 4888 | * Returns 0 on success, -ENOMEM is there's no memory |
e114e473 CS |
4889 | */ |
4890 | static __init int smack_init(void) | |
4891 | { | |
bbd3662a | 4892 | struct cred *cred = (struct cred *) current->cred; |
676dac4b | 4893 | struct task_smack *tsp; |
d84f4f99 | 4894 | |
4e328b08 | 4895 | smack_rule_cache = KMEM_CACHE(smack_rule, 0); |
4ca75287 | 4896 | if (!smack_rule_cache) |
4e328b08 | 4897 | return -ENOMEM; |
4e328b08 | 4898 | |
bbd3662a CS |
4899 | /* |
4900 | * Set the security state for the initial task. | |
4901 | */ | |
4902 | tsp = smack_cred(cred); | |
4903 | init_task_smack(tsp, &smack_known_floor, &smack_known_floor); | |
4904 | ||
4905 | /* | |
4906 | * Register with LSM | |
4907 | */ | |
f17b27a2 | 4908 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), &smack_lsmid); |
d21b7b04 JB |
4909 | smack_enabled = 1; |
4910 | ||
21abb1ec CS |
4911 | pr_info("Smack: Initializing.\n"); |
4912 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4913 | pr_info("Smack: Netfilter enabled.\n"); | |
4914 | #endif | |
4915 | #ifdef SMACK_IPV6_PORT_LABELING | |
4916 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4917 | #endif | |
4918 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4919 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4920 | #endif | |
e114e473 | 4921 | |
86812bb0 CS |
4922 | /* initialize the smack_known_list */ |
4923 | init_smack_known_list(); | |
e114e473 | 4924 | |
e114e473 CS |
4925 | return 0; |
4926 | } | |
4927 | ||
4928 | /* | |
4929 | * Smack requires early initialization in order to label | |
4930 | * all processes and objects when they are created. | |
4931 | */ | |
3d6e5f6d | 4932 | DEFINE_LSM(smack) = { |
07aed2f2 | 4933 | .name = "smack", |
14bd99c8 | 4934 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
bbd3662a | 4935 | .blobs = &smack_blob_sizes, |
3d6e5f6d KC |
4936 | .init = smack_init, |
4937 | }; |