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Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
3bf2789c | 44 | #include <linux/parser.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 | ||
21abb1ec | 54 | #ifdef SMACK_IPV6_PORT_LABELING |
3c7ce342 | 55 | DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 56 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 57 | #endif |
1a5b472b | 58 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 59 | int smack_enabled; |
c6739443 | 60 | |
3d04c924 | 61 | static const match_table_t smk_mount_tokens = { |
3bf2789c VT |
62 | {Opt_fsdefault, SMK_FSDEFAULT "%s"}, |
63 | {Opt_fsfloor, SMK_FSFLOOR "%s"}, | |
64 | {Opt_fshat, SMK_FSHAT "%s"}, | |
65 | {Opt_fsroot, SMK_FSROOT "%s"}, | |
66 | {Opt_fstransmute, SMK_FSTRANS "%s"}, | |
67 | {Opt_error, NULL}, | |
68 | }; | |
69 | ||
3d04c924 CS |
70 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
71 | static char *smk_bu_mess[] = { | |
72 | "Bringup Error", /* Unused */ | |
73 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
74 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
75 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
76 | }; | |
77 | ||
d166c802 CS |
78 | static void smk_bu_mode(int mode, char *s) |
79 | { | |
80 | int i = 0; | |
81 | ||
82 | if (mode & MAY_READ) | |
83 | s[i++] = 'r'; | |
84 | if (mode & MAY_WRITE) | |
85 | s[i++] = 'w'; | |
86 | if (mode & MAY_EXEC) | |
87 | s[i++] = 'x'; | |
88 | if (mode & MAY_APPEND) | |
89 | s[i++] = 'a'; | |
90 | if (mode & MAY_TRANSMUTE) | |
91 | s[i++] = 't'; | |
92 | if (mode & MAY_LOCK) | |
93 | s[i++] = 'l'; | |
94 | if (i == 0) | |
95 | s[i++] = '-'; | |
96 | s[i] = '\0'; | |
97 | } | |
98 | #endif | |
99 | ||
100 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
101 | static int smk_bu_note(char *note, struct smack_known *sskp, |
102 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
103 | { |
104 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
105 | ||
106 | if (rc <= 0) | |
107 | return rc; | |
bf4b2fee CS |
108 | if (rc > SMACK_UNCONFINED_OBJECT) |
109 | rc = 0; | |
d166c802 CS |
110 | |
111 | smk_bu_mode(mode, acc); | |
bf4b2fee | 112 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 113 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
114 | return 0; |
115 | } | |
116 | #else | |
21c7eae2 | 117 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
118 | #endif |
119 | ||
120 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
121 | static int smk_bu_current(char *note, struct smack_known *oskp, |
122 | int mode, int rc) | |
d166c802 CS |
123 | { |
124 | struct task_smack *tsp = current_security(); | |
125 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
126 | ||
127 | if (rc <= 0) | |
128 | return rc; | |
bf4b2fee CS |
129 | if (rc > SMACK_UNCONFINED_OBJECT) |
130 | rc = 0; | |
d166c802 CS |
131 | |
132 | smk_bu_mode(mode, acc); | |
bf4b2fee | 133 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
134 | tsp->smk_task->smk_known, oskp->smk_known, |
135 | acc, current->comm, note); | |
d166c802 CS |
136 | return 0; |
137 | } | |
138 | #else | |
21c7eae2 | 139 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
140 | #endif |
141 | ||
142 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
143 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
144 | { | |
145 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 146 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
147 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
148 | ||
149 | if (rc <= 0) | |
150 | return rc; | |
bf4b2fee CS |
151 | if (rc > SMACK_UNCONFINED_OBJECT) |
152 | rc = 0; | |
d166c802 CS |
153 | |
154 | smk_bu_mode(mode, acc); | |
bf4b2fee | 155 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 156 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
157 | current->comm, otp->comm); |
158 | return 0; | |
159 | } | |
160 | #else | |
161 | #define smk_bu_task(otp, mode, RC) (RC) | |
162 | #endif | |
163 | ||
164 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
165 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
166 | { | |
167 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 168 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
169 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
170 | ||
bf4b2fee CS |
171 | if (isp->smk_flags & SMK_INODE_IMPURE) |
172 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
173 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
174 | ||
d166c802 CS |
175 | if (rc <= 0) |
176 | return rc; | |
bf4b2fee CS |
177 | if (rc > SMACK_UNCONFINED_OBJECT) |
178 | rc = 0; | |
179 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
180 | (mode & (MAY_WRITE | MAY_APPEND))) | |
181 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
182 | |
183 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
184 | |
185 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
186 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
187 | inode->i_sb->s_id, inode->i_ino, current->comm); |
188 | return 0; | |
189 | } | |
190 | #else | |
191 | #define smk_bu_inode(inode, mode, RC) (RC) | |
192 | #endif | |
193 | ||
194 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
195 | static int smk_bu_file(struct file *file, int mode, int rc) | |
196 | { | |
197 | struct task_smack *tsp = current_security(); | |
198 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 199 | struct inode *inode = file_inode(file); |
bf4b2fee | 200 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
201 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
202 | ||
bf4b2fee CS |
203 | if (isp->smk_flags & SMK_INODE_IMPURE) |
204 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
205 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
206 | ||
d166c802 CS |
207 | if (rc <= 0) |
208 | return rc; | |
bf4b2fee CS |
209 | if (rc > SMACK_UNCONFINED_OBJECT) |
210 | rc = 0; | |
d166c802 CS |
211 | |
212 | smk_bu_mode(mode, acc); | |
bf4b2fee | 213 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 214 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 215 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
216 | current->comm); |
217 | return 0; | |
218 | } | |
219 | #else | |
220 | #define smk_bu_file(file, mode, RC) (RC) | |
221 | #endif | |
222 | ||
223 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
224 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
225 | int mode, int rc) | |
226 | { | |
227 | struct task_smack *tsp = cred->security; | |
228 | struct smack_known *sskp = tsp->smk_task; | |
45063097 | 229 | struct inode *inode = file_inode(file); |
bf4b2fee | 230 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
231 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
232 | ||
bf4b2fee CS |
233 | if (isp->smk_flags & SMK_INODE_IMPURE) |
234 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
235 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
236 | ||
d166c802 CS |
237 | if (rc <= 0) |
238 | return rc; | |
bf4b2fee CS |
239 | if (rc > SMACK_UNCONFINED_OBJECT) |
240 | rc = 0; | |
d166c802 CS |
241 | |
242 | smk_bu_mode(mode, acc); | |
bf4b2fee | 243 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 244 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 245 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
246 | current->comm); |
247 | return 0; | |
248 | } | |
249 | #else | |
250 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
251 | #endif | |
252 | ||
e114e473 CS |
253 | /** |
254 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 255 | * @name: type of the label (attribute) |
e114e473 CS |
256 | * @ip: a pointer to the inode |
257 | * @dp: a pointer to the dentry | |
258 | * | |
e774ad68 LP |
259 | * Returns a pointer to the master list entry for the Smack label, |
260 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 261 | */ |
2f823ff8 CS |
262 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
263 | struct dentry *dp) | |
e114e473 CS |
264 | { |
265 | int rc; | |
f7112e6c | 266 | char *buffer; |
2f823ff8 | 267 | struct smack_known *skp = NULL; |
e114e473 | 268 | |
5d6c3191 | 269 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 270 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 271 | |
f7112e6c CS |
272 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
273 | if (buffer == NULL) | |
e774ad68 | 274 | return ERR_PTR(-ENOMEM); |
e114e473 | 275 | |
5d6c3191 | 276 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
277 | if (rc < 0) |
278 | skp = ERR_PTR(rc); | |
279 | else if (rc == 0) | |
280 | skp = NULL; | |
281 | else | |
2f823ff8 | 282 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
283 | |
284 | kfree(buffer); | |
285 | ||
2f823ff8 | 286 | return skp; |
e114e473 CS |
287 | } |
288 | ||
289 | /** | |
290 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 291 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
292 | * |
293 | * Returns the new blob or NULL if there's no memory available | |
294 | */ | |
1eddfe8e | 295 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
296 | { |
297 | struct inode_smack *isp; | |
298 | ||
1a5b472b | 299 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
300 | if (isp == NULL) |
301 | return NULL; | |
302 | ||
21c7eae2 | 303 | isp->smk_inode = skp; |
e114e473 CS |
304 | isp->smk_flags = 0; |
305 | mutex_init(&isp->smk_lock); | |
306 | ||
307 | return isp; | |
308 | } | |
309 | ||
7898e1f8 CS |
310 | /** |
311 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
312 | * @task: a pointer to the Smack label for the running task |
313 | * @forked: a pointer to the Smack label for the forked task | |
314 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
315 | * |
316 | * Returns the new blob or NULL if there's no memory available | |
317 | */ | |
2f823ff8 CS |
318 | static struct task_smack *new_task_smack(struct smack_known *task, |
319 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
320 | { |
321 | struct task_smack *tsp; | |
322 | ||
323 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
324 | if (tsp == NULL) | |
325 | return NULL; | |
326 | ||
327 | tsp->smk_task = task; | |
328 | tsp->smk_forked = forked; | |
329 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 330 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
331 | mutex_init(&tsp->smk_rules_lock); |
332 | ||
333 | return tsp; | |
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 CS |
351 | list_for_each_entry_rcu(orp, ohead, list) { |
352 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
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; |
5663884c LP |
423 | |
424 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
425 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
426 | smk_ad_setfield_u_tsk(&ad, tracer); | |
427 | saip = &ad; | |
428 | } | |
429 | ||
6d1cff2a AR |
430 | rcu_read_lock(); |
431 | tsp = __task_cred(tracer)->security; | |
21c7eae2 | 432 | tracer_known = smk_of_task(tsp); |
5663884c | 433 | |
66867818 LP |
434 | if ((mode & PTRACE_MODE_ATTACH) && |
435 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
436 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 437 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
438 | rc = 0; |
439 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
440 | rc = -EACCES; | |
441 | else if (capable(CAP_SYS_PTRACE)) | |
442 | rc = 0; | |
443 | else | |
444 | rc = -EACCES; | |
445 | ||
446 | if (saip) | |
21c7eae2 LP |
447 | smack_log(tracer_known->smk_known, |
448 | tracee_known->smk_known, | |
449 | 0, rc, saip); | |
66867818 | 450 | |
6d1cff2a | 451 | rcu_read_unlock(); |
66867818 LP |
452 | return rc; |
453 | } | |
454 | ||
455 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 456 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
457 | |
458 | rcu_read_unlock(); | |
5663884c LP |
459 | return rc; |
460 | } | |
461 | ||
e114e473 CS |
462 | /* |
463 | * LSM hooks. | |
464 | * We he, that is fun! | |
465 | */ | |
466 | ||
467 | /** | |
9e48858f | 468 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 469 | * @ctp: child task pointer |
5663884c | 470 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
471 | * |
472 | * Returns 0 if access is OK, an error code otherwise | |
473 | * | |
5663884c | 474 | * Do the capability checks. |
e114e473 | 475 | */ |
9e48858f | 476 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 477 | { |
2f823ff8 | 478 | struct smack_known *skp; |
e114e473 | 479 | |
6d1cff2a | 480 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 481 | |
b1d9e6b0 | 482 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
483 | } |
484 | ||
485 | /** | |
486 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
487 | * @ptp: parent task pointer | |
488 | * | |
489 | * Returns 0 if access is OK, an error code otherwise | |
490 | * | |
5663884c | 491 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
492 | */ |
493 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
494 | { | |
495 | int rc; | |
2f823ff8 | 496 | struct smack_known *skp; |
5cd9c58f | 497 | |
959e6c7f | 498 | skp = smk_of_task(current_security()); |
ecfcc53f | 499 | |
21c7eae2 | 500 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
501 | return rc; |
502 | } | |
503 | ||
504 | /** | |
505 | * smack_syslog - Smack approval on syslog | |
506 | * @type: message type | |
507 | * | |
e114e473 CS |
508 | * Returns 0 on success, error code otherwise. |
509 | */ | |
12b3052c | 510 | static int smack_syslog(int typefrom_file) |
e114e473 | 511 | { |
12b3052c | 512 | int rc = 0; |
2f823ff8 | 513 | struct smack_known *skp = smk_of_current(); |
e114e473 | 514 | |
1880eff7 | 515 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
516 | return 0; |
517 | ||
24ea1b6e | 518 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
519 | rc = -EACCES; |
520 | ||
521 | return rc; | |
522 | } | |
523 | ||
524 | ||
525 | /* | |
526 | * Superblock Hooks. | |
527 | */ | |
528 | ||
529 | /** | |
530 | * smack_sb_alloc_security - allocate a superblock blob | |
531 | * @sb: the superblock getting the blob | |
532 | * | |
533 | * Returns 0 on success or -ENOMEM on error. | |
534 | */ | |
535 | static int smack_sb_alloc_security(struct super_block *sb) | |
536 | { | |
537 | struct superblock_smack *sbsp; | |
538 | ||
539 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
540 | ||
541 | if (sbsp == NULL) | |
542 | return -ENOMEM; | |
543 | ||
21c7eae2 LP |
544 | sbsp->smk_root = &smack_known_floor; |
545 | sbsp->smk_default = &smack_known_floor; | |
546 | sbsp->smk_floor = &smack_known_floor; | |
547 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 548 | /* |
9f50eda2 | 549 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 550 | */ |
e114e473 CS |
551 | sb->s_security = sbsp; |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | /** | |
557 | * smack_sb_free_security - free a superblock blob | |
558 | * @sb: the superblock getting the blob | |
559 | * | |
560 | */ | |
561 | static void smack_sb_free_security(struct super_block *sb) | |
562 | { | |
563 | kfree(sb->s_security); | |
564 | sb->s_security = NULL; | |
565 | } | |
566 | ||
567 | /** | |
568 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 569 | * @orig: where to start |
251a2a95 | 570 | * @smackopts: mount options string |
e114e473 CS |
571 | * |
572 | * Returns 0 on success or -ENOMEM on error. | |
573 | * | |
574 | * Copy the Smack specific mount options out of the mount | |
575 | * options list. | |
576 | */ | |
e0007529 | 577 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
578 | { |
579 | char *cp, *commap, *otheropts, *dp; | |
580 | ||
e114e473 CS |
581 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
582 | if (otheropts == NULL) | |
583 | return -ENOMEM; | |
584 | ||
585 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
586 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
587 | dp = smackopts; | |
588 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
589 | dp = smackopts; | |
590 | else if (strstr(cp, SMK_FSHAT) == cp) | |
591 | dp = smackopts; | |
592 | else if (strstr(cp, SMK_FSROOT) == cp) | |
593 | dp = smackopts; | |
e830b394 CS |
594 | else if (strstr(cp, SMK_FSTRANS) == cp) |
595 | dp = smackopts; | |
e114e473 CS |
596 | else |
597 | dp = otheropts; | |
598 | ||
599 | commap = strchr(cp, ','); | |
600 | if (commap != NULL) | |
601 | *commap = '\0'; | |
602 | ||
603 | if (*dp != '\0') | |
604 | strcat(dp, ","); | |
605 | strcat(dp, cp); | |
606 | } | |
607 | ||
608 | strcpy(orig, otheropts); | |
609 | free_page((unsigned long)otheropts); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | /** | |
3bf2789c VT |
615 | * smack_parse_opts_str - parse Smack specific mount options |
616 | * @options: mount options string | |
617 | * @opts: where to store converted mount opts | |
618 | * | |
619 | * Returns 0 on success or -ENOMEM on error. | |
620 | * | |
621 | * converts Smack specific mount options to generic security option format | |
622 | */ | |
623 | static int smack_parse_opts_str(char *options, | |
624 | struct security_mnt_opts *opts) | |
625 | { | |
626 | char *p; | |
3d04c924 CS |
627 | char *fsdefault = NULL; |
628 | char *fsfloor = NULL; | |
629 | char *fshat = NULL; | |
630 | char *fsroot = NULL; | |
631 | char *fstransmute = NULL; | |
632 | int rc = -ENOMEM; | |
633 | int num_mnt_opts = 0; | |
634 | int token; | |
3bf2789c VT |
635 | |
636 | opts->num_mnt_opts = 0; | |
637 | ||
638 | if (!options) | |
639 | return 0; | |
640 | ||
641 | while ((p = strsep(&options, ",")) != NULL) { | |
3bf2789c VT |
642 | substring_t args[MAX_OPT_ARGS]; |
643 | ||
644 | if (!*p) | |
645 | continue; | |
646 | ||
3d04c924 | 647 | token = match_token(p, smk_mount_tokens, args); |
3bf2789c VT |
648 | |
649 | switch (token) { | |
650 | case Opt_fsdefault: | |
651 | if (fsdefault) | |
652 | goto out_opt_err; | |
653 | fsdefault = match_strdup(&args[0]); | |
654 | if (!fsdefault) | |
655 | goto out_err; | |
656 | break; | |
657 | case Opt_fsfloor: | |
658 | if (fsfloor) | |
659 | goto out_opt_err; | |
660 | fsfloor = match_strdup(&args[0]); | |
661 | if (!fsfloor) | |
662 | goto out_err; | |
663 | break; | |
664 | case Opt_fshat: | |
665 | if (fshat) | |
666 | goto out_opt_err; | |
667 | fshat = match_strdup(&args[0]); | |
668 | if (!fshat) | |
669 | goto out_err; | |
670 | break; | |
671 | case Opt_fsroot: | |
672 | if (fsroot) | |
673 | goto out_opt_err; | |
674 | fsroot = match_strdup(&args[0]); | |
675 | if (!fsroot) | |
676 | goto out_err; | |
677 | break; | |
678 | case Opt_fstransmute: | |
679 | if (fstransmute) | |
680 | goto out_opt_err; | |
681 | fstransmute = match_strdup(&args[0]); | |
682 | if (!fstransmute) | |
683 | goto out_err; | |
684 | break; | |
685 | default: | |
686 | rc = -EINVAL; | |
687 | pr_warn("Smack: unknown mount option\n"); | |
688 | goto out_err; | |
689 | } | |
690 | } | |
691 | ||
8c15d66e | 692 | opts->mnt_opts = kcalloc(NUM_SMK_MNT_OPTS, sizeof(char *), GFP_KERNEL); |
3bf2789c VT |
693 | if (!opts->mnt_opts) |
694 | goto out_err; | |
695 | ||
696 | opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int), | |
8c15d66e | 697 | GFP_KERNEL); |
c3c8dc9f | 698 | if (!opts->mnt_opts_flags) |
3bf2789c | 699 | goto out_err; |
3bf2789c VT |
700 | |
701 | if (fsdefault) { | |
702 | opts->mnt_opts[num_mnt_opts] = fsdefault; | |
703 | opts->mnt_opts_flags[num_mnt_opts++] = FSDEFAULT_MNT; | |
704 | } | |
705 | if (fsfloor) { | |
706 | opts->mnt_opts[num_mnt_opts] = fsfloor; | |
707 | opts->mnt_opts_flags[num_mnt_opts++] = FSFLOOR_MNT; | |
708 | } | |
709 | if (fshat) { | |
710 | opts->mnt_opts[num_mnt_opts] = fshat; | |
711 | opts->mnt_opts_flags[num_mnt_opts++] = FSHAT_MNT; | |
712 | } | |
713 | if (fsroot) { | |
714 | opts->mnt_opts[num_mnt_opts] = fsroot; | |
715 | opts->mnt_opts_flags[num_mnt_opts++] = FSROOT_MNT; | |
716 | } | |
717 | if (fstransmute) { | |
718 | opts->mnt_opts[num_mnt_opts] = fstransmute; | |
719 | opts->mnt_opts_flags[num_mnt_opts++] = FSTRANS_MNT; | |
720 | } | |
721 | ||
722 | opts->num_mnt_opts = num_mnt_opts; | |
723 | return 0; | |
724 | ||
725 | out_opt_err: | |
726 | rc = -EINVAL; | |
727 | pr_warn("Smack: duplicate mount options\n"); | |
728 | ||
729 | out_err: | |
730 | kfree(fsdefault); | |
731 | kfree(fsfloor); | |
732 | kfree(fshat); | |
733 | kfree(fsroot); | |
734 | kfree(fstransmute); | |
735 | return rc; | |
736 | } | |
737 | ||
738 | /** | |
739 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 740 | * @sb: the file system superblock |
3bf2789c VT |
741 | * @opts: Smack mount options |
742 | * @kern_flags: mount option from kernel space or user space | |
743 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
744 | * |
745 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
746 | * |
747 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
748 | * labels. | |
e114e473 | 749 | */ |
3bf2789c VT |
750 | static int smack_set_mnt_opts(struct super_block *sb, |
751 | struct security_mnt_opts *opts, | |
752 | unsigned long kern_flags, | |
753 | unsigned long *set_kern_flags) | |
e114e473 CS |
754 | { |
755 | struct dentry *root = sb->s_root; | |
c6f493d6 | 756 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
757 | struct superblock_smack *sp = sb->s_security; |
758 | struct inode_smack *isp; | |
24ea1b6e | 759 | struct smack_known *skp; |
3bf2789c VT |
760 | int i; |
761 | int num_opts = opts->num_mnt_opts; | |
e830b394 | 762 | int transmute = 0; |
e114e473 | 763 | |
9f50eda2 | 764 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 765 | return 0; |
eb982cb4 | 766 | |
2097f599 HS |
767 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
768 | /* | |
769 | * Unprivileged mounts don't get to specify Smack values. | |
770 | */ | |
771 | if (num_opts) | |
772 | return -EPERM; | |
773 | /* | |
774 | * Unprivileged mounts get root and default from the caller. | |
775 | */ | |
776 | skp = smk_of_current(); | |
777 | sp->smk_root = skp; | |
778 | sp->smk_default = skp; | |
779 | /* | |
780 | * For a handful of fs types with no user-controlled | |
781 | * backing store it's okay to trust security labels | |
782 | * in the filesystem. The rest are untrusted. | |
783 | */ | |
784 | if (sb->s_user_ns != &init_user_ns && | |
785 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
786 | sb->s_magic != RAMFS_MAGIC) { | |
787 | transmute = 1; | |
788 | sp->smk_flags |= SMK_SB_UNTRUSTED; | |
789 | } | |
790 | } | |
791 | ||
9f50eda2 | 792 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 793 | |
3bf2789c VT |
794 | for (i = 0; i < num_opts; i++) { |
795 | switch (opts->mnt_opts_flags[i]) { | |
796 | case FSDEFAULT_MNT: | |
797 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
798 | if (IS_ERR(skp)) |
799 | return PTR_ERR(skp); | |
3bf2789c VT |
800 | sp->smk_default = skp; |
801 | break; | |
802 | case FSFLOOR_MNT: | |
803 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
804 | if (IS_ERR(skp)) |
805 | return PTR_ERR(skp); | |
806 | sp->smk_floor = skp; | |
3bf2789c VT |
807 | break; |
808 | case FSHAT_MNT: | |
809 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
810 | if (IS_ERR(skp)) |
811 | return PTR_ERR(skp); | |
3bf2789c VT |
812 | sp->smk_hat = skp; |
813 | break; | |
814 | case FSROOT_MNT: | |
815 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
816 | if (IS_ERR(skp)) |
817 | return PTR_ERR(skp); | |
818 | sp->smk_root = skp; | |
3bf2789c VT |
819 | break; |
820 | case FSTRANS_MNT: | |
821 | skp = smk_import_entry(opts->mnt_opts[i], 0); | |
e774ad68 LP |
822 | if (IS_ERR(skp)) |
823 | return PTR_ERR(skp); | |
824 | sp->smk_root = skp; | |
825 | transmute = 1; | |
3bf2789c VT |
826 | break; |
827 | default: | |
828 | break; | |
e114e473 CS |
829 | } |
830 | } | |
831 | ||
832 | /* | |
833 | * Initialize the root inode. | |
834 | */ | |
835 | isp = inode->i_security; | |
55dfc5da JB |
836 | if (isp == NULL) { |
837 | isp = new_inode_smack(sp->smk_root); | |
838 | if (isp == NULL) | |
839 | return -ENOMEM; | |
840 | inode->i_security = isp; | |
e830b394 | 841 | } else |
e114e473 CS |
842 | isp->smk_inode = sp->smk_root; |
843 | ||
e830b394 CS |
844 | if (transmute) |
845 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
846 | ||
e114e473 CS |
847 | return 0; |
848 | } | |
849 | ||
3bf2789c VT |
850 | /** |
851 | * smack_sb_kern_mount - Smack specific mount processing | |
852 | * @sb: the file system superblock | |
853 | * @flags: the mount flags | |
854 | * @data: the smack mount options | |
855 | * | |
856 | * Returns 0 on success, an error code on failure | |
857 | */ | |
858 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) | |
859 | { | |
860 | int rc = 0; | |
861 | char *options = data; | |
862 | struct security_mnt_opts opts; | |
863 | ||
864 | security_init_mnt_opts(&opts); | |
865 | ||
866 | if (!options) | |
867 | goto out; | |
868 | ||
869 | rc = smack_parse_opts_str(options, &opts); | |
870 | if (rc) | |
871 | goto out_err; | |
872 | ||
873 | out: | |
874 | rc = smack_set_mnt_opts(sb, &opts, 0, NULL); | |
875 | ||
876 | out_err: | |
877 | security_free_mnt_opts(&opts); | |
878 | return rc; | |
879 | } | |
880 | ||
e114e473 CS |
881 | /** |
882 | * smack_sb_statfs - Smack check on statfs | |
883 | * @dentry: identifies the file system in question | |
884 | * | |
885 | * Returns 0 if current can read the floor of the filesystem, | |
886 | * and error code otherwise | |
887 | */ | |
888 | static int smack_sb_statfs(struct dentry *dentry) | |
889 | { | |
890 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
891 | int rc; |
892 | struct smk_audit_info ad; | |
893 | ||
a269434d | 894 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 895 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 896 | |
ecfcc53f | 897 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 898 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 899 | return rc; |
e114e473 CS |
900 | } |
901 | ||
676dac4b CS |
902 | /* |
903 | * BPRM hooks | |
904 | */ | |
905 | ||
ce8a4321 CS |
906 | /** |
907 | * smack_bprm_set_creds - set creds for exec | |
908 | * @bprm: the exec information | |
909 | * | |
5663884c | 910 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 911 | */ |
676dac4b CS |
912 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
913 | { | |
496ad9aa | 914 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 915 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 916 | struct inode_smack *isp; |
809c02e0 | 917 | struct superblock_smack *sbsp; |
676dac4b CS |
918 | int rc; |
919 | ||
ddb4a144 | 920 | if (bprm->called_set_creds) |
676dac4b CS |
921 | return 0; |
922 | ||
84088ba2 JS |
923 | isp = inode->i_security; |
924 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
925 | return 0; |
926 | ||
809c02e0 SF |
927 | sbsp = inode->i_sb->s_security; |
928 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && | |
929 | isp->smk_task != sbsp->smk_root) | |
930 | return 0; | |
931 | ||
9227dd2a | 932 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
933 | struct task_struct *tracer; |
934 | rc = 0; | |
935 | ||
936 | rcu_read_lock(); | |
937 | tracer = ptrace_parent(current); | |
938 | if (likely(tracer != NULL)) | |
939 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 940 | isp->smk_task, |
5663884c LP |
941 | PTRACE_MODE_ATTACH, |
942 | __func__); | |
943 | rcu_read_unlock(); | |
944 | ||
945 | if (rc != 0) | |
946 | return rc; | |
947 | } else if (bprm->unsafe) | |
84088ba2 | 948 | return -EPERM; |
676dac4b | 949 | |
84088ba2 JS |
950 | bsp->smk_task = isp->smk_task; |
951 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 952 | |
ccbb6e10 KC |
953 | /* Decide if this is a secure exec. */ |
954 | if (bsp->smk_task != bsp->smk_forked) | |
955 | bprm->secureexec = 1; | |
956 | ||
84088ba2 JS |
957 | return 0; |
958 | } | |
676dac4b | 959 | |
e114e473 CS |
960 | /* |
961 | * Inode hooks | |
962 | */ | |
963 | ||
964 | /** | |
965 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 966 | * @inode: the inode in need of a blob |
e114e473 CS |
967 | * |
968 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
969 | */ | |
970 | static int smack_inode_alloc_security(struct inode *inode) | |
971 | { | |
2f823ff8 CS |
972 | struct smack_known *skp = smk_of_current(); |
973 | ||
21c7eae2 | 974 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
975 | if (inode->i_security == NULL) |
976 | return -ENOMEM; | |
977 | return 0; | |
978 | } | |
979 | ||
980 | /** | |
3d4f673a HS |
981 | * smack_inode_free_rcu - Free inode_smack blob from cache |
982 | * @head: the rcu_head for getting inode_smack pointer | |
983 | * | |
984 | * Call back function called from call_rcu() to free | |
985 | * the i_security blob pointer in inode | |
986 | */ | |
987 | static void smack_inode_free_rcu(struct rcu_head *head) | |
988 | { | |
989 | struct inode_smack *issp; | |
990 | ||
991 | issp = container_of(head, struct inode_smack, smk_rcu); | |
992 | kmem_cache_free(smack_inode_cache, issp); | |
993 | } | |
994 | ||
995 | /** | |
996 | * smack_inode_free_security - free an inode blob using call_rcu() | |
251a2a95 | 997 | * @inode: the inode with a blob |
e114e473 | 998 | * |
3d4f673a | 999 | * Clears the blob pointer in inode using RCU |
e114e473 CS |
1000 | */ |
1001 | static void smack_inode_free_security(struct inode *inode) | |
1002 | { | |
3d4f673a HS |
1003 | struct inode_smack *issp = inode->i_security; |
1004 | ||
1005 | /* | |
1006 | * The inode may still be referenced in a path walk and | |
1007 | * a call to smack_inode_permission() can be made | |
1008 | * after smack_inode_free_security() is called. | |
1009 | * To avoid race condition free the i_security via RCU | |
1010 | * and leave the current inode->i_security pointer intact. | |
1011 | * The inode will be freed after the RCU grace period too. | |
1012 | */ | |
1013 | call_rcu(&issp->smk_rcu, smack_inode_free_rcu); | |
e114e473 CS |
1014 | } |
1015 | ||
1016 | /** | |
1017 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
1018 | * @inode: the newly created inode |
1019 | * @dir: containing directory object | |
2a7dba39 | 1020 | * @qstr: unused |
e114e473 CS |
1021 | * @name: where to put the attribute name |
1022 | * @value: where to put the attribute value | |
1023 | * @len: where to put the length of the attribute | |
1024 | * | |
1025 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
1026 | */ | |
1027 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 1028 | const struct qstr *qstr, const char **name, |
2a7dba39 | 1029 | void **value, size_t *len) |
e114e473 | 1030 | { |
2267b13a | 1031 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 1032 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
1033 | struct smack_known *isp = smk_of_inode(inode); |
1034 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 1035 | int may; |
e114e473 | 1036 | |
9548906b TH |
1037 | if (name) |
1038 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1039 | |
68390ccf | 1040 | if (value && len) { |
7898e1f8 | 1041 | rcu_read_lock(); |
21c7eae2 LP |
1042 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1043 | &skp->smk_rules); | |
7898e1f8 | 1044 | rcu_read_unlock(); |
5c6d1125 JS |
1045 | |
1046 | /* | |
1047 | * If the access rule allows transmutation and | |
1048 | * the directory requests transmutation then | |
1049 | * by all means transmute. | |
2267b13a | 1050 | * Mark the inode as changed. |
5c6d1125 | 1051 | */ |
7898e1f8 | 1052 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1053 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1054 | isp = dsp; |
2267b13a CS |
1055 | issp->smk_flags |= SMK_INODE_CHANGED; |
1056 | } | |
5c6d1125 | 1057 | |
21c7eae2 | 1058 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1059 | if (*value == NULL) |
1060 | return -ENOMEM; | |
e114e473 | 1061 | |
21c7eae2 | 1062 | *len = strlen(isp->smk_known); |
68390ccf | 1063 | } |
e114e473 CS |
1064 | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * smack_inode_link - Smack check on link | |
1070 | * @old_dentry: the existing object | |
1071 | * @dir: unused | |
1072 | * @new_dentry: the new object | |
1073 | * | |
1074 | * Returns 0 if access is permitted, an error code otherwise | |
1075 | */ | |
1076 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1077 | struct dentry *new_dentry) | |
1078 | { | |
21c7eae2 | 1079 | struct smack_known *isp; |
ecfcc53f EB |
1080 | struct smk_audit_info ad; |
1081 | int rc; | |
1082 | ||
a269434d | 1083 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1084 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1085 | |
c6f493d6 | 1086 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1087 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1088 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1089 | |
8802565b | 1090 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1091 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1092 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1093 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1094 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1095 | } |
1096 | ||
1097 | return rc; | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * smack_inode_unlink - Smack check on inode deletion | |
1102 | * @dir: containing directory object | |
1103 | * @dentry: file to unlink | |
1104 | * | |
1105 | * Returns 0 if current can write the containing directory | |
1106 | * and the object, error code otherwise | |
1107 | */ | |
1108 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1109 | { | |
c6f493d6 | 1110 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1111 | struct smk_audit_info ad; |
e114e473 CS |
1112 | int rc; |
1113 | ||
a269434d | 1114 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1115 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1116 | ||
e114e473 CS |
1117 | /* |
1118 | * You need write access to the thing you're unlinking | |
1119 | */ | |
ecfcc53f | 1120 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1121 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1122 | if (rc == 0) { |
e114e473 CS |
1123 | /* |
1124 | * You also need write access to the containing directory | |
1125 | */ | |
cdb56b60 | 1126 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1127 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1128 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1129 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1130 | } |
e114e473 CS |
1131 | return rc; |
1132 | } | |
1133 | ||
1134 | /** | |
1135 | * smack_inode_rmdir - Smack check on directory deletion | |
1136 | * @dir: containing directory object | |
1137 | * @dentry: directory to unlink | |
1138 | * | |
1139 | * Returns 0 if current can write the containing directory | |
1140 | * and the directory, error code otherwise | |
1141 | */ | |
1142 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1143 | { | |
ecfcc53f | 1144 | struct smk_audit_info ad; |
e114e473 CS |
1145 | int rc; |
1146 | ||
a269434d | 1147 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1148 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1149 | ||
e114e473 CS |
1150 | /* |
1151 | * You need write access to the thing you're removing | |
1152 | */ | |
c6f493d6 DH |
1153 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1154 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1155 | if (rc == 0) { |
e114e473 CS |
1156 | /* |
1157 | * You also need write access to the containing directory | |
1158 | */ | |
cdb56b60 | 1159 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1160 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1161 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1162 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1163 | } |
e114e473 CS |
1164 | |
1165 | return rc; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1170 | * @old_inode: unused |
1171 | * @old_dentry: the old object | |
1172 | * @new_inode: unused | |
1173 | * @new_dentry: the new object | |
e114e473 CS |
1174 | * |
1175 | * Read and write access is required on both the old and | |
1176 | * new directories. | |
1177 | * | |
1178 | * Returns 0 if access is permitted, an error code otherwise | |
1179 | */ | |
1180 | static int smack_inode_rename(struct inode *old_inode, | |
1181 | struct dentry *old_dentry, | |
1182 | struct inode *new_inode, | |
1183 | struct dentry *new_dentry) | |
1184 | { | |
1185 | int rc; | |
21c7eae2 | 1186 | struct smack_known *isp; |
ecfcc53f EB |
1187 | struct smk_audit_info ad; |
1188 | ||
a269434d | 1189 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1190 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1191 | |
c6f493d6 | 1192 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1193 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1194 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1195 | |
8802565b | 1196 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1197 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1198 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1199 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1200 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1201 | } |
e114e473 CS |
1202 | return rc; |
1203 | } | |
1204 | ||
1205 | /** | |
1206 | * smack_inode_permission - Smack version of permission() | |
1207 | * @inode: the inode in question | |
1208 | * @mask: the access requested | |
e114e473 CS |
1209 | * |
1210 | * This is the important Smack hook. | |
1211 | * | |
1212 | * Returns 0 if access is permitted, -EACCES otherwise | |
1213 | */ | |
e74f71eb | 1214 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1215 | { |
9f50eda2 | 1216 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1217 | struct smk_audit_info ad; |
e74f71eb | 1218 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1219 | int rc; |
d09ca739 EP |
1220 | |
1221 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1222 | /* |
1223 | * No permission to check. Existence test. Yup, it's there. | |
1224 | */ | |
1225 | if (mask == 0) | |
1226 | return 0; | |
8c9e80ed | 1227 | |
9f50eda2 SF |
1228 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1229 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1230 | return -EACCES; | |
1231 | } | |
1232 | ||
8c9e80ed | 1233 | /* May be droppable after audit */ |
e74f71eb | 1234 | if (no_block) |
8c9e80ed | 1235 | return -ECHILD; |
f48b7399 | 1236 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1237 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1238 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1239 | rc = smk_bu_inode(inode, mask, rc); | |
1240 | return rc; | |
e114e473 CS |
1241 | } |
1242 | ||
1243 | /** | |
1244 | * smack_inode_setattr - Smack check for setting attributes | |
1245 | * @dentry: the object | |
1246 | * @iattr: for the force flag | |
1247 | * | |
1248 | * Returns 0 if access is permitted, an error code otherwise | |
1249 | */ | |
1250 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1251 | { | |
ecfcc53f | 1252 | struct smk_audit_info ad; |
d166c802 CS |
1253 | int rc; |
1254 | ||
e114e473 CS |
1255 | /* |
1256 | * Need to allow for clearing the setuid bit. | |
1257 | */ | |
1258 | if (iattr->ia_valid & ATTR_FORCE) | |
1259 | return 0; | |
a269434d | 1260 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1261 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1262 | |
c6f493d6 DH |
1263 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1264 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1265 | return rc; |
e114e473 CS |
1266 | } |
1267 | ||
1268 | /** | |
1269 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1270 | * @mnt: vfsmount of the object |
e114e473 CS |
1271 | * @dentry: the object |
1272 | * | |
1273 | * Returns 0 if access is permitted, an error code otherwise | |
1274 | */ | |
3f7036a0 | 1275 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1276 | { |
ecfcc53f | 1277 | struct smk_audit_info ad; |
c6f493d6 | 1278 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1279 | int rc; |
ecfcc53f | 1280 | |
f48b7399 | 1281 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1282 | smk_ad_setfield_u_fs_path(&ad, *path); |
1283 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1284 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1285 | return rc; |
e114e473 CS |
1286 | } |
1287 | ||
1288 | /** | |
1289 | * smack_inode_setxattr - Smack check for setting xattrs | |
1290 | * @dentry: the object | |
1291 | * @name: name of the attribute | |
e95ef49b LP |
1292 | * @value: value of the attribute |
1293 | * @size: size of the value | |
e114e473 CS |
1294 | * @flags: unused |
1295 | * | |
1296 | * This protects the Smack attribute explicitly. | |
1297 | * | |
1298 | * Returns 0 if access is permitted, an error code otherwise | |
1299 | */ | |
8f0cfa52 DH |
1300 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1301 | const void *value, size_t size, int flags) | |
e114e473 | 1302 | { |
ecfcc53f | 1303 | struct smk_audit_info ad; |
19760ad0 CS |
1304 | struct smack_known *skp; |
1305 | int check_priv = 0; | |
1306 | int check_import = 0; | |
1307 | int check_star = 0; | |
bcdca225 | 1308 | int rc = 0; |
e114e473 | 1309 | |
19760ad0 CS |
1310 | /* |
1311 | * Check label validity here so import won't fail in post_setxattr | |
1312 | */ | |
bcdca225 CS |
1313 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1314 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1315 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1316 | check_priv = 1; | |
1317 | check_import = 1; | |
1318 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1319 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1320 | check_priv = 1; | |
1321 | check_import = 1; | |
1322 | check_star = 1; | |
5c6d1125 | 1323 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1324 | check_priv = 1; |
5c6d1125 JS |
1325 | if (size != TRANS_TRUE_SIZE || |
1326 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1327 | rc = -EINVAL; | |
bcdca225 CS |
1328 | } else |
1329 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1330 | ||
19760ad0 CS |
1331 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1332 | rc = -EPERM; | |
1333 | ||
1334 | if (rc == 0 && check_import) { | |
b862e561 | 1335 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1336 | if (IS_ERR(skp)) |
1337 | rc = PTR_ERR(skp); | |
1338 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1339 | (skp == &smack_known_star || skp == &smack_known_web))) |
1340 | rc = -EINVAL; | |
1341 | } | |
1342 | ||
a269434d | 1343 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1344 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1345 | ||
d166c802 | 1346 | if (rc == 0) { |
c6f493d6 DH |
1347 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1348 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1349 | } |
bcdca225 CS |
1350 | |
1351 | return rc; | |
e114e473 CS |
1352 | } |
1353 | ||
1354 | /** | |
1355 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1356 | * @dentry: object | |
1357 | * @name: attribute name | |
1358 | * @value: attribute value | |
1359 | * @size: attribute size | |
1360 | * @flags: unused | |
1361 | * | |
1362 | * Set the pointer in the inode blob to the entry found | |
1363 | * in the master label list. | |
1364 | */ | |
8f0cfa52 DH |
1365 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1366 | const void *value, size_t size, int flags) | |
e114e473 | 1367 | { |
2f823ff8 | 1368 | struct smack_known *skp; |
c6f493d6 | 1369 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1370 | |
2f823ff8 CS |
1371 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1372 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1373 | return; | |
1374 | } | |
1375 | ||
676dac4b | 1376 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1377 | skp = smk_import_entry(value, size); |
e774ad68 | 1378 | if (!IS_ERR(skp)) |
21c7eae2 | 1379 | isp->smk_inode = skp; |
5c6d1125 | 1380 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1381 | skp = smk_import_entry(value, size); |
e774ad68 | 1382 | if (!IS_ERR(skp)) |
2f823ff8 | 1383 | isp->smk_task = skp; |
7898e1f8 | 1384 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1385 | skp = smk_import_entry(value, size); |
e774ad68 | 1386 | if (!IS_ERR(skp)) |
2f823ff8 | 1387 | isp->smk_mmap = skp; |
2f823ff8 | 1388 | } |
e114e473 CS |
1389 | |
1390 | return; | |
1391 | } | |
1392 | ||
ce8a4321 | 1393 | /** |
e114e473 CS |
1394 | * smack_inode_getxattr - Smack check on getxattr |
1395 | * @dentry: the object | |
1396 | * @name: unused | |
1397 | * | |
1398 | * Returns 0 if access is permitted, an error code otherwise | |
1399 | */ | |
8f0cfa52 | 1400 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1401 | { |
ecfcc53f | 1402 | struct smk_audit_info ad; |
d166c802 | 1403 | int rc; |
ecfcc53f | 1404 | |
a269434d | 1405 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1406 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1407 | ||
c6f493d6 DH |
1408 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1409 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1410 | return rc; |
e114e473 CS |
1411 | } |
1412 | ||
ce8a4321 | 1413 | /** |
e114e473 CS |
1414 | * smack_inode_removexattr - Smack check on removexattr |
1415 | * @dentry: the object | |
1416 | * @name: name of the attribute | |
1417 | * | |
1418 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1419 | * | |
1420 | * Returns 0 if access is permitted, an error code otherwise | |
1421 | */ | |
8f0cfa52 | 1422 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1423 | { |
676dac4b | 1424 | struct inode_smack *isp; |
ecfcc53f | 1425 | struct smk_audit_info ad; |
bcdca225 | 1426 | int rc = 0; |
e114e473 | 1427 | |
bcdca225 CS |
1428 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1429 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1430 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1431 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1432 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1433 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1434 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1435 | rc = -EPERM; |
1436 | } else | |
1437 | rc = cap_inode_removexattr(dentry, name); | |
1438 | ||
f59bdfba CS |
1439 | if (rc != 0) |
1440 | return rc; | |
1441 | ||
a269434d | 1442 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1443 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1444 | |
c6f493d6 DH |
1445 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1446 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1447 | if (rc != 0) |
1448 | return rc; | |
1449 | ||
c6f493d6 | 1450 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1451 | /* |
1452 | * Don't do anything special for these. | |
1453 | * XATTR_NAME_SMACKIPIN | |
1454 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1455 | */ |
8012495e | 1456 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1457 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1458 | struct superblock_smack *sbsp = sbp->s_security; |
1459 | ||
1460 | isp->smk_inode = sbsp->smk_default; | |
1461 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1462 | isp->smk_task = NULL; |
f59bdfba | 1463 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1464 | isp->smk_mmap = NULL; |
f59bdfba CS |
1465 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1466 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1467 | |
f59bdfba | 1468 | return 0; |
e114e473 CS |
1469 | } |
1470 | ||
1471 | /** | |
1472 | * smack_inode_getsecurity - get smack xattrs | |
1473 | * @inode: the object | |
1474 | * @name: attribute name | |
1475 | * @buffer: where to put the result | |
57e7ba04 | 1476 | * @alloc: duplicate memory |
e114e473 CS |
1477 | * |
1478 | * Returns the size of the attribute or an error code | |
1479 | */ | |
ea861dfd | 1480 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1481 | const char *name, void **buffer, |
1482 | bool alloc) | |
1483 | { | |
1484 | struct socket_smack *ssp; | |
1485 | struct socket *sock; | |
1486 | struct super_block *sbp; | |
1487 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1488 | struct smack_known *isp; |
e114e473 | 1489 | |
57e7ba04 | 1490 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1491 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1492 | else { |
1493 | /* | |
1494 | * The rest of the Smack xattrs are only on sockets. | |
1495 | */ | |
1496 | sbp = ip->i_sb; | |
1497 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1498 | return -EOPNOTSUPP; | |
e114e473 | 1499 | |
57e7ba04 CS |
1500 | sock = SOCKET_I(ip); |
1501 | if (sock == NULL || sock->sk == NULL) | |
1502 | return -EOPNOTSUPP; | |
e114e473 | 1503 | |
57e7ba04 | 1504 | ssp = sock->sk->sk_security; |
e114e473 | 1505 | |
57e7ba04 CS |
1506 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1507 | isp = ssp->smk_in; | |
1508 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1509 | isp = ssp->smk_out; | |
1510 | else | |
1511 | return -EOPNOTSUPP; | |
1512 | } | |
e114e473 | 1513 | |
57e7ba04 CS |
1514 | if (alloc) { |
1515 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1516 | if (*buffer == NULL) | |
1517 | return -ENOMEM; | |
e114e473 CS |
1518 | } |
1519 | ||
57e7ba04 | 1520 | return strlen(isp->smk_known); |
e114e473 CS |
1521 | } |
1522 | ||
1523 | ||
1524 | /** | |
1525 | * smack_inode_listsecurity - list the Smack attributes | |
1526 | * @inode: the object | |
1527 | * @buffer: where they go | |
1528 | * @buffer_size: size of buffer | |
e114e473 CS |
1529 | */ |
1530 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1531 | size_t buffer_size) | |
1532 | { | |
fd5c9d23 | 1533 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1534 | |
fd5c9d23 | 1535 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1536 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1537 | |
1538 | return len; | |
e114e473 CS |
1539 | } |
1540 | ||
d20bdda6 AD |
1541 | /** |
1542 | * smack_inode_getsecid - Extract inode's security id | |
1543 | * @inode: inode to extract the info from | |
1544 | * @secid: where result will be saved | |
1545 | */ | |
d6335d77 | 1546 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 AD |
1547 | { |
1548 | struct inode_smack *isp = inode->i_security; | |
1549 | ||
21c7eae2 | 1550 | *secid = isp->smk_inode->smk_secid; |
d20bdda6 AD |
1551 | } |
1552 | ||
e114e473 CS |
1553 | /* |
1554 | * File Hooks | |
1555 | */ | |
1556 | ||
491a0b08 CS |
1557 | /* |
1558 | * There is no smack_file_permission hook | |
e114e473 CS |
1559 | * |
1560 | * Should access checks be done on each read or write? | |
1561 | * UNICOS and SELinux say yes. | |
1562 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1563 | * | |
1564 | * I'll say no for now. Smack does not do the frequent | |
1565 | * label changing that SELinux does. | |
1566 | */ | |
e114e473 CS |
1567 | |
1568 | /** | |
1569 | * smack_file_alloc_security - assign a file security blob | |
1570 | * @file: the object | |
1571 | * | |
1572 | * The security blob for a file is a pointer to the master | |
1573 | * label list, so no allocation is done. | |
1574 | * | |
5e7270a6 CS |
1575 | * f_security is the owner security information. It |
1576 | * isn't used on file access checks, it's for send_sigio. | |
1577 | * | |
e114e473 CS |
1578 | * Returns 0 |
1579 | */ | |
1580 | static int smack_file_alloc_security(struct file *file) | |
1581 | { | |
2f823ff8 CS |
1582 | struct smack_known *skp = smk_of_current(); |
1583 | ||
21c7eae2 | 1584 | file->f_security = skp; |
e114e473 CS |
1585 | return 0; |
1586 | } | |
1587 | ||
1588 | /** | |
1589 | * smack_file_free_security - clear a file security blob | |
1590 | * @file: the object | |
1591 | * | |
1592 | * The security blob for a file is a pointer to the master | |
1593 | * label list, so no memory is freed. | |
1594 | */ | |
1595 | static void smack_file_free_security(struct file *file) | |
1596 | { | |
1597 | file->f_security = NULL; | |
1598 | } | |
1599 | ||
1600 | /** | |
1601 | * smack_file_ioctl - Smack check on ioctls | |
1602 | * @file: the object | |
1603 | * @cmd: what to do | |
1604 | * @arg: unused | |
1605 | * | |
1606 | * Relies heavily on the correct use of the ioctl command conventions. | |
1607 | * | |
1608 | * Returns 0 if allowed, error code otherwise | |
1609 | */ | |
1610 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1611 | unsigned long arg) | |
1612 | { | |
1613 | int rc = 0; | |
ecfcc53f | 1614 | struct smk_audit_info ad; |
5e7270a6 | 1615 | struct inode *inode = file_inode(file); |
ecfcc53f | 1616 | |
83a1e53f SWK |
1617 | if (unlikely(IS_PRIVATE(inode))) |
1618 | return 0; | |
1619 | ||
f48b7399 | 1620 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1621 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1622 | |
d166c802 | 1623 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1624 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1625 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1626 | } | |
e114e473 | 1627 | |
d166c802 | 1628 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1629 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1630 | rc = smk_bu_file(file, MAY_READ, rc); |
1631 | } | |
e114e473 CS |
1632 | |
1633 | return rc; | |
1634 | } | |
1635 | ||
1636 | /** | |
1637 | * smack_file_lock - Smack check on file locking | |
1638 | * @file: the object | |
251a2a95 | 1639 | * @cmd: unused |
e114e473 | 1640 | * |
c0ab6e56 | 1641 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1642 | */ |
1643 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1644 | { | |
ecfcc53f | 1645 | struct smk_audit_info ad; |
d166c802 | 1646 | int rc; |
5e7270a6 | 1647 | struct inode *inode = file_inode(file); |
ecfcc53f | 1648 | |
83a1e53f SWK |
1649 | if (unlikely(IS_PRIVATE(inode))) |
1650 | return 0; | |
1651 | ||
92f42509 EP |
1652 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1653 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1654 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1655 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1656 | return rc; | |
e114e473 CS |
1657 | } |
1658 | ||
1659 | /** | |
1660 | * smack_file_fcntl - Smack check on fcntl | |
1661 | * @file: the object | |
1662 | * @cmd: what action to check | |
1663 | * @arg: unused | |
1664 | * | |
531f1d45 CS |
1665 | * Generally these operations are harmless. |
1666 | * File locking operations present an obvious mechanism | |
1667 | * for passing information, so they require write access. | |
1668 | * | |
e114e473 CS |
1669 | * Returns 0 if current has access, error code otherwise |
1670 | */ | |
1671 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1672 | unsigned long arg) | |
1673 | { | |
ecfcc53f | 1674 | struct smk_audit_info ad; |
531f1d45 | 1675 | int rc = 0; |
5e7270a6 | 1676 | struct inode *inode = file_inode(file); |
ecfcc53f | 1677 | |
83a1e53f SWK |
1678 | if (unlikely(IS_PRIVATE(inode))) |
1679 | return 0; | |
1680 | ||
e114e473 | 1681 | switch (cmd) { |
e114e473 | 1682 | case F_GETLK: |
c0ab6e56 | 1683 | break; |
e114e473 CS |
1684 | case F_SETLK: |
1685 | case F_SETLKW: | |
c0ab6e56 CS |
1686 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1687 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1688 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1689 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1690 | break; |
e114e473 CS |
1691 | case F_SETOWN: |
1692 | case F_SETSIG: | |
531f1d45 CS |
1693 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1694 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1695 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1696 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1697 | break; |
1698 | default: | |
531f1d45 | 1699 | break; |
e114e473 CS |
1700 | } |
1701 | ||
1702 | return rc; | |
1703 | } | |
1704 | ||
7898e1f8 | 1705 | /** |
e5467859 | 1706 | * smack_mmap_file : |
7898e1f8 CS |
1707 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1708 | * if mapping anonymous memory. | |
1709 | * @file contains the file structure for file to map (may be NULL). | |
1710 | * @reqprot contains the protection requested by the application. | |
1711 | * @prot contains the protection that will be applied by the kernel. | |
1712 | * @flags contains the operational flags. | |
1713 | * Return 0 if permission is granted. | |
1714 | */ | |
e5467859 | 1715 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1716 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1717 | unsigned long flags) |
7898e1f8 | 1718 | { |
272cd7a8 | 1719 | struct smack_known *skp; |
2f823ff8 | 1720 | struct smack_known *mkp; |
7898e1f8 CS |
1721 | struct smack_rule *srp; |
1722 | struct task_smack *tsp; | |
21c7eae2 | 1723 | struct smack_known *okp; |
7898e1f8 | 1724 | struct inode_smack *isp; |
809c02e0 | 1725 | struct superblock_smack *sbsp; |
0e0a070d CS |
1726 | int may; |
1727 | int mmay; | |
1728 | int tmay; | |
7898e1f8 CS |
1729 | int rc; |
1730 | ||
496ad9aa | 1731 | if (file == NULL) |
7898e1f8 CS |
1732 | return 0; |
1733 | ||
83a1e53f SWK |
1734 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1735 | return 0; | |
1736 | ||
496ad9aa | 1737 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1738 | if (isp->smk_mmap == NULL) |
1739 | return 0; | |
809c02e0 SF |
1740 | sbsp = file_inode(file)->i_sb->s_security; |
1741 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && | |
1742 | isp->smk_mmap != sbsp->smk_root) | |
1743 | return -EACCES; | |
2f823ff8 | 1744 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1745 | |
1746 | tsp = current_security(); | |
2f823ff8 | 1747 | skp = smk_of_current(); |
7898e1f8 CS |
1748 | rc = 0; |
1749 | ||
1750 | rcu_read_lock(); | |
1751 | /* | |
1752 | * For each Smack rule associated with the subject | |
1753 | * label verify that the SMACK64MMAP also has access | |
1754 | * to that rule's object label. | |
7898e1f8 | 1755 | */ |
272cd7a8 | 1756 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1757 | okp = srp->smk_object; |
7898e1f8 CS |
1758 | /* |
1759 | * Matching labels always allows access. | |
1760 | */ | |
21c7eae2 | 1761 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1762 | continue; |
0e0a070d CS |
1763 | /* |
1764 | * If there is a matching local rule take | |
1765 | * that into account as well. | |
1766 | */ | |
21c7eae2 LP |
1767 | may = smk_access_entry(srp->smk_subject->smk_known, |
1768 | okp->smk_known, | |
1769 | &tsp->smk_rules); | |
0e0a070d CS |
1770 | if (may == -ENOENT) |
1771 | may = srp->smk_access; | |
1772 | else | |
1773 | may &= srp->smk_access; | |
1774 | /* | |
1775 | * If may is zero the SMACK64MMAP subject can't | |
1776 | * possibly have less access. | |
1777 | */ | |
1778 | if (may == 0) | |
1779 | continue; | |
1780 | ||
1781 | /* | |
1782 | * Fetch the global list entry. | |
1783 | * If there isn't one a SMACK64MMAP subject | |
1784 | * can't have as much access as current. | |
1785 | */ | |
21c7eae2 LP |
1786 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1787 | &mkp->smk_rules); | |
0e0a070d CS |
1788 | if (mmay == -ENOENT) { |
1789 | rc = -EACCES; | |
1790 | break; | |
1791 | } | |
1792 | /* | |
1793 | * If there is a local entry it modifies the | |
1794 | * potential access, too. | |
1795 | */ | |
21c7eae2 LP |
1796 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1797 | &tsp->smk_rules); | |
0e0a070d CS |
1798 | if (tmay != -ENOENT) |
1799 | mmay &= tmay; | |
7898e1f8 | 1800 | |
0e0a070d CS |
1801 | /* |
1802 | * If there is any access available to current that is | |
1803 | * not available to a SMACK64MMAP subject | |
1804 | * deny access. | |
1805 | */ | |
75a25637 | 1806 | if ((may | mmay) != mmay) { |
0e0a070d | 1807 | rc = -EACCES; |
7898e1f8 | 1808 | break; |
0e0a070d | 1809 | } |
7898e1f8 CS |
1810 | } |
1811 | ||
1812 | rcu_read_unlock(); | |
1813 | ||
1814 | return rc; | |
1815 | } | |
1816 | ||
e114e473 CS |
1817 | /** |
1818 | * smack_file_set_fowner - set the file security blob value | |
1819 | * @file: object in question | |
1820 | * | |
e114e473 | 1821 | */ |
e0b93edd | 1822 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1823 | { |
5e7270a6 | 1824 | file->f_security = smk_of_current(); |
e114e473 CS |
1825 | } |
1826 | ||
1827 | /** | |
1828 | * smack_file_send_sigiotask - Smack on sigio | |
1829 | * @tsk: The target task | |
1830 | * @fown: the object the signal come from | |
1831 | * @signum: unused | |
1832 | * | |
1833 | * Allow a privileged task to get signals even if it shouldn't | |
1834 | * | |
1835 | * Returns 0 if a subject with the object's smack could | |
1836 | * write to the task, an error code otherwise. | |
1837 | */ | |
1838 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1839 | struct fown_struct *fown, int signum) | |
1840 | { | |
2f823ff8 CS |
1841 | struct smack_known *skp; |
1842 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1843 | struct file *file; |
1844 | int rc; | |
ecfcc53f | 1845 | struct smk_audit_info ad; |
e114e473 CS |
1846 | |
1847 | /* | |
1848 | * struct fown_struct is never outside the context of a struct file | |
1849 | */ | |
1850 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1851 | |
ecfcc53f | 1852 | /* we don't log here as rc can be overriden */ |
21c7eae2 | 1853 | skp = file->f_security; |
c60b9066 CS |
1854 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1855 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
5cd9c58f | 1856 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1857 | rc = 0; |
1858 | ||
1859 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1860 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1861 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1862 | return rc; |
1863 | } | |
1864 | ||
1865 | /** | |
1866 | * smack_file_receive - Smack file receive check | |
1867 | * @file: the object | |
1868 | * | |
1869 | * Returns 0 if current has access, error code otherwise | |
1870 | */ | |
1871 | static int smack_file_receive(struct file *file) | |
1872 | { | |
d166c802 | 1873 | int rc; |
e114e473 | 1874 | int may = 0; |
ecfcc53f | 1875 | struct smk_audit_info ad; |
5e7270a6 | 1876 | struct inode *inode = file_inode(file); |
79be0935 CS |
1877 | struct socket *sock; |
1878 | struct task_smack *tsp; | |
1879 | struct socket_smack *ssp; | |
e114e473 | 1880 | |
9777582e SWK |
1881 | if (unlikely(IS_PRIVATE(inode))) |
1882 | return 0; | |
1883 | ||
4482a44f | 1884 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1885 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1886 | |
51d59af2 | 1887 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1888 | sock = SOCKET_I(inode); |
1889 | ssp = sock->sk->sk_security; | |
1890 | tsp = current_security(); | |
1891 | /* | |
1892 | * If the receiving process can't write to the | |
1893 | * passed socket or if the passed socket can't | |
1894 | * write to the receiving process don't accept | |
1895 | * the passed socket. | |
1896 | */ | |
1897 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1898 | rc = smk_bu_file(file, may, rc); | |
1899 | if (rc < 0) | |
1900 | return rc; | |
1901 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1902 | rc = smk_bu_file(file, may, rc); | |
1903 | return rc; | |
1904 | } | |
e114e473 CS |
1905 | /* |
1906 | * This code relies on bitmasks. | |
1907 | */ | |
1908 | if (file->f_mode & FMODE_READ) | |
1909 | may = MAY_READ; | |
1910 | if (file->f_mode & FMODE_WRITE) | |
1911 | may |= MAY_WRITE; | |
1912 | ||
5e7270a6 | 1913 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1914 | rc = smk_bu_file(file, may, rc); |
1915 | return rc; | |
e114e473 CS |
1916 | } |
1917 | ||
531f1d45 | 1918 | /** |
83d49856 | 1919 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1920 | * @file: the object |
a6834c0b | 1921 | * @cred: task credential |
531f1d45 CS |
1922 | * |
1923 | * Set the security blob in the file structure. | |
a6834c0b CS |
1924 | * Allow the open only if the task has read access. There are |
1925 | * many read operations (e.g. fstat) that you can do with an | |
1926 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1927 | * |
1928 | * Returns 0 | |
1929 | */ | |
83d49856 | 1930 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1931 | { |
a6834c0b | 1932 | struct task_smack *tsp = cred->security; |
5e7270a6 | 1933 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1934 | struct smk_audit_info ad; |
1935 | int rc; | |
531f1d45 | 1936 | |
a6834c0b CS |
1937 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1938 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1939 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
d166c802 | 1940 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1941 | |
1942 | return rc; | |
531f1d45 CS |
1943 | } |
1944 | ||
e114e473 CS |
1945 | /* |
1946 | * Task hooks | |
1947 | */ | |
1948 | ||
ee18d64c DH |
1949 | /** |
1950 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1951 | * @new: the new credentials | |
1952 | * @gfp: the atomicity of any memory allocations | |
1953 | * | |
1954 | * Prepare a blank set of credentials for modification. This must allocate all | |
1955 | * the memory the LSM module might require such that cred_transfer() can | |
1956 | * complete without error. | |
1957 | */ | |
1958 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1959 | { | |
7898e1f8 CS |
1960 | struct task_smack *tsp; |
1961 | ||
1962 | tsp = new_task_smack(NULL, NULL, gfp); | |
1963 | if (tsp == NULL) | |
676dac4b | 1964 | return -ENOMEM; |
7898e1f8 CS |
1965 | |
1966 | cred->security = tsp; | |
1967 | ||
ee18d64c DH |
1968 | return 0; |
1969 | } | |
1970 | ||
1971 | ||
e114e473 | 1972 | /** |
f1752eec DH |
1973 | * smack_cred_free - "free" task-level security credentials |
1974 | * @cred: the credentials in question | |
e114e473 | 1975 | * |
e114e473 | 1976 | */ |
f1752eec | 1977 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1978 | { |
7898e1f8 CS |
1979 | struct task_smack *tsp = cred->security; |
1980 | struct smack_rule *rp; | |
1981 | struct list_head *l; | |
1982 | struct list_head *n; | |
1983 | ||
1984 | if (tsp == NULL) | |
1985 | return; | |
1986 | cred->security = NULL; | |
1987 | ||
38416e53 ZJ |
1988 | smk_destroy_label_list(&tsp->smk_relabel); |
1989 | ||
7898e1f8 CS |
1990 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1991 | rp = list_entry(l, struct smack_rule, list); | |
1992 | list_del(&rp->list); | |
1993 | kfree(rp); | |
1994 | } | |
1995 | kfree(tsp); | |
e114e473 CS |
1996 | } |
1997 | ||
d84f4f99 DH |
1998 | /** |
1999 | * smack_cred_prepare - prepare new set of credentials for modification | |
2000 | * @new: the new credentials | |
2001 | * @old: the original credentials | |
2002 | * @gfp: the atomicity of any memory allocations | |
2003 | * | |
2004 | * Prepare a new set of credentials for modification. | |
2005 | */ | |
2006 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2007 | gfp_t gfp) | |
2008 | { | |
676dac4b CS |
2009 | struct task_smack *old_tsp = old->security; |
2010 | struct task_smack *new_tsp; | |
7898e1f8 | 2011 | int rc; |
676dac4b | 2012 | |
7898e1f8 | 2013 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
2014 | if (new_tsp == NULL) |
2015 | return -ENOMEM; | |
2016 | ||
b437aba8 HS |
2017 | new->security = new_tsp; |
2018 | ||
7898e1f8 CS |
2019 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2020 | if (rc != 0) | |
2021 | return rc; | |
2022 | ||
38416e53 ZJ |
2023 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2024 | gfp); | |
2025 | if (rc != 0) | |
2026 | return rc; | |
2027 | ||
d84f4f99 DH |
2028 | return 0; |
2029 | } | |
2030 | ||
ee18d64c DH |
2031 | /** |
2032 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2033 | * @new: the new credentials | |
2034 | * @old: the original credentials | |
2035 | * | |
2036 | * Fill in a set of blank credentials from another set of credentials. | |
2037 | */ | |
2038 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2039 | { | |
676dac4b CS |
2040 | struct task_smack *old_tsp = old->security; |
2041 | struct task_smack *new_tsp = new->security; | |
2042 | ||
2043 | new_tsp->smk_task = old_tsp->smk_task; | |
2044 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2045 | mutex_init(&new_tsp->smk_rules_lock); |
2046 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2047 | ||
2048 | ||
2049 | /* cbs copy rule list */ | |
ee18d64c DH |
2050 | } |
2051 | ||
3a3b7ce9 DH |
2052 | /** |
2053 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2054 | * @new: points to the set of credentials to be modified. |
2055 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2056 | * |
2057 | * Set the security data for a kernel service. | |
2058 | */ | |
2059 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2060 | { | |
676dac4b | 2061 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 | 2062 | |
152f91d4 | 2063 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2064 | return 0; |
2065 | } | |
2066 | ||
2067 | /** | |
2068 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2069 | * @new: points to the set of credentials to be modified |
2070 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2071 | * |
2072 | * Set the file creation context in a set of credentials to the same | |
2073 | * as the objective context of the specified inode | |
2074 | */ | |
2075 | static int smack_kernel_create_files_as(struct cred *new, | |
2076 | struct inode *inode) | |
2077 | { | |
2078 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2079 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2080 | |
21c7eae2 | 2081 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2082 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2083 | return 0; |
2084 | } | |
2085 | ||
ecfcc53f EB |
2086 | /** |
2087 | * smk_curacc_on_task - helper to log task related access | |
2088 | * @p: the task object | |
531f1d45 CS |
2089 | * @access: the access requested |
2090 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2091 | * |
2092 | * Return 0 if access is permitted | |
2093 | */ | |
531f1d45 CS |
2094 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2095 | const char *caller) | |
ecfcc53f EB |
2096 | { |
2097 | struct smk_audit_info ad; | |
6d1cff2a | 2098 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2099 | int rc; |
ecfcc53f | 2100 | |
531f1d45 | 2101 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2102 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2103 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2104 | rc = smk_bu_task(p, access, rc); |
2105 | return rc; | |
ecfcc53f EB |
2106 | } |
2107 | ||
e114e473 CS |
2108 | /** |
2109 | * smack_task_setpgid - Smack check on setting pgid | |
2110 | * @p: the task object | |
2111 | * @pgid: unused | |
2112 | * | |
2113 | * Return 0 if write access is permitted | |
2114 | */ | |
2115 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2116 | { | |
531f1d45 | 2117 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2118 | } |
2119 | ||
2120 | /** | |
2121 | * smack_task_getpgid - Smack access check for getpgid | |
2122 | * @p: the object task | |
2123 | * | |
2124 | * Returns 0 if current can read the object task, error code otherwise | |
2125 | */ | |
2126 | static int smack_task_getpgid(struct task_struct *p) | |
2127 | { | |
531f1d45 | 2128 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2129 | } |
2130 | ||
2131 | /** | |
2132 | * smack_task_getsid - Smack access check for getsid | |
2133 | * @p: the object task | |
2134 | * | |
2135 | * Returns 0 if current can read the object task, error code otherwise | |
2136 | */ | |
2137 | static int smack_task_getsid(struct task_struct *p) | |
2138 | { | |
531f1d45 | 2139 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2140 | } |
2141 | ||
2142 | /** | |
2143 | * smack_task_getsecid - get the secid of the task | |
2144 | * @p: the object task | |
2145 | * @secid: where to put the result | |
2146 | * | |
2147 | * Sets the secid to contain a u32 version of the smack label. | |
2148 | */ | |
2149 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2150 | { | |
6d1cff2a | 2151 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2152 | |
2153 | *secid = skp->smk_secid; | |
e114e473 CS |
2154 | } |
2155 | ||
2156 | /** | |
2157 | * smack_task_setnice - Smack check on setting nice | |
2158 | * @p: the task object | |
2159 | * @nice: unused | |
2160 | * | |
2161 | * Return 0 if write access is permitted | |
2162 | */ | |
2163 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2164 | { | |
b1d9e6b0 | 2165 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2166 | } |
2167 | ||
2168 | /** | |
2169 | * smack_task_setioprio - Smack check on setting ioprio | |
2170 | * @p: the task object | |
2171 | * @ioprio: unused | |
2172 | * | |
2173 | * Return 0 if write access is permitted | |
2174 | */ | |
2175 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2176 | { | |
b1d9e6b0 | 2177 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2178 | } |
2179 | ||
2180 | /** | |
2181 | * smack_task_getioprio - Smack check on reading ioprio | |
2182 | * @p: the task object | |
2183 | * | |
2184 | * Return 0 if read access is permitted | |
2185 | */ | |
2186 | static int smack_task_getioprio(struct task_struct *p) | |
2187 | { | |
531f1d45 | 2188 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2189 | } |
2190 | ||
2191 | /** | |
2192 | * smack_task_setscheduler - Smack check on setting scheduler | |
2193 | * @p: the task object | |
2194 | * @policy: unused | |
2195 | * @lp: unused | |
2196 | * | |
2197 | * Return 0 if read access is permitted | |
2198 | */ | |
b0ae1981 | 2199 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2200 | { |
b1d9e6b0 | 2201 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2202 | } |
2203 | ||
2204 | /** | |
2205 | * smack_task_getscheduler - Smack check on reading scheduler | |
2206 | * @p: the task object | |
2207 | * | |
2208 | * Return 0 if read access is permitted | |
2209 | */ | |
2210 | static int smack_task_getscheduler(struct task_struct *p) | |
2211 | { | |
531f1d45 | 2212 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2213 | } |
2214 | ||
2215 | /** | |
2216 | * smack_task_movememory - Smack check on moving memory | |
2217 | * @p: the task object | |
2218 | * | |
2219 | * Return 0 if write access is permitted | |
2220 | */ | |
2221 | static int smack_task_movememory(struct task_struct *p) | |
2222 | { | |
531f1d45 | 2223 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2224 | } |
2225 | ||
2226 | /** | |
2227 | * smack_task_kill - Smack check on signal delivery | |
2228 | * @p: the task object | |
2229 | * @info: unused | |
2230 | * @sig: unused | |
2231 | * @secid: identifies the smack to use in lieu of current's | |
2232 | * | |
2233 | * Return 0 if write access is permitted | |
2234 | * | |
2235 | * The secid behavior is an artifact of an SELinux hack | |
2236 | * in the USB code. Someday it may go away. | |
2237 | */ | |
2238 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
2239 | int sig, u32 secid) | |
2240 | { | |
ecfcc53f | 2241 | struct smk_audit_info ad; |
2f823ff8 | 2242 | struct smack_known *skp; |
6d1cff2a | 2243 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2244 | int rc; |
ecfcc53f | 2245 | |
18d872f7 RK |
2246 | if (!sig) |
2247 | return 0; /* null signal; existence test */ | |
2248 | ||
ecfcc53f EB |
2249 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2250 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2251 | /* |
2252 | * Sending a signal requires that the sender | |
2253 | * can write the receiver. | |
2254 | */ | |
d166c802 | 2255 | if (secid == 0) { |
c60b9066 CS |
2256 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2257 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2258 | return rc; |
2259 | } | |
e114e473 CS |
2260 | /* |
2261 | * If the secid isn't 0 we're dealing with some USB IO | |
2262 | * specific behavior. This is not clean. For one thing | |
2263 | * we can't take privilege into account. | |
2264 | */ | |
2f823ff8 | 2265 | skp = smack_from_secid(secid); |
c60b9066 CS |
2266 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2267 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2268 | return rc; |
e114e473 CS |
2269 | } |
2270 | ||
e114e473 CS |
2271 | /** |
2272 | * smack_task_to_inode - copy task smack into the inode blob | |
2273 | * @p: task to copy from | |
251a2a95 | 2274 | * @inode: inode to copy to |
e114e473 CS |
2275 | * |
2276 | * Sets the smack pointer in the inode security blob | |
2277 | */ | |
2278 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2279 | { | |
2280 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2281 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2282 | |
21c7eae2 | 2283 | isp->smk_inode = skp; |
e114e473 CS |
2284 | } |
2285 | ||
2286 | /* | |
2287 | * Socket hooks. | |
2288 | */ | |
2289 | ||
2290 | /** | |
2291 | * smack_sk_alloc_security - Allocate a socket blob | |
2292 | * @sk: the socket | |
2293 | * @family: unused | |
251a2a95 | 2294 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2295 | * |
2296 | * Assign Smack pointers to current | |
2297 | * | |
2298 | * Returns 0 on success, -ENOMEM is there's no memory | |
2299 | */ | |
2300 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2301 | { | |
2f823ff8 | 2302 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2303 | struct socket_smack *ssp; |
2304 | ||
2305 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2306 | if (ssp == NULL) | |
2307 | return -ENOMEM; | |
2308 | ||
08382c9f | 2309 | /* |
2310 | * Sockets created by kernel threads receive web label. | |
2311 | */ | |
2312 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2313 | ssp->smk_in = &smack_known_web; | |
2314 | ssp->smk_out = &smack_known_web; | |
2315 | } else { | |
2316 | ssp->smk_in = skp; | |
2317 | ssp->smk_out = skp; | |
2318 | } | |
272cd7a8 | 2319 | ssp->smk_packet = NULL; |
e114e473 CS |
2320 | |
2321 | sk->sk_security = ssp; | |
2322 | ||
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | /** | |
2327 | * smack_sk_free_security - Free a socket blob | |
2328 | * @sk: the socket | |
2329 | * | |
2330 | * Clears the blob pointer | |
2331 | */ | |
2332 | static void smack_sk_free_security(struct sock *sk) | |
2333 | { | |
0c96d1f5 VG |
2334 | #ifdef SMACK_IPV6_PORT_LABELING |
2335 | struct smk_port_label *spp; | |
2336 | ||
2337 | if (sk->sk_family == PF_INET6) { | |
2338 | rcu_read_lock(); | |
2339 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2340 | if (spp->smk_sock != sk) | |
2341 | continue; | |
2342 | spp->smk_can_reuse = 1; | |
2343 | break; | |
2344 | } | |
2345 | rcu_read_unlock(); | |
2346 | } | |
2347 | #endif | |
e114e473 CS |
2348 | kfree(sk->sk_security); |
2349 | } | |
2350 | ||
07feee8f | 2351 | /** |
21abb1ec | 2352 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2353 | * @sip: the object end |
2354 | * | |
2355 | * looks for host based access restrictions | |
2356 | * | |
2357 | * This version will only be appropriate for really small sets of single label | |
2358 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2359 | * taken before calling this function. | |
2360 | * | |
2361 | * Returns the label of the far end or NULL if it's not special. | |
2362 | */ | |
21abb1ec | 2363 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2364 | { |
21abb1ec | 2365 | struct smk_net4addr *snp; |
07feee8f PM |
2366 | struct in_addr *siap = &sip->sin_addr; |
2367 | ||
2368 | if (siap->s_addr == 0) | |
2369 | return NULL; | |
2370 | ||
21abb1ec CS |
2371 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2372 | /* | |
2373 | * we break after finding the first match because | |
2374 | * the list is sorted from longest to shortest mask | |
2375 | * so we have found the most specific match | |
2376 | */ | |
2377 | if (snp->smk_host.s_addr == | |
2378 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2379 | return snp->smk_label; | |
2380 | ||
2381 | return NULL; | |
2382 | } | |
2383 | ||
2384 | #if IS_ENABLED(CONFIG_IPV6) | |
2385 | /* | |
2386 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2387 | * @sip: the address | |
2388 | * | |
2389 | * Returns boolean true if this is the localhost address | |
2390 | */ | |
2391 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2392 | { | |
2393 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2394 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2395 | ||
2396 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2397 | ntohs(be16p[7]) == 1) | |
2398 | return true; | |
2399 | return false; | |
2400 | } | |
2401 | ||
2402 | /** | |
2403 | * smack_ipv6host_label - check host based restrictions | |
2404 | * @sip: the object end | |
2405 | * | |
2406 | * looks for host based access restrictions | |
2407 | * | |
2408 | * This version will only be appropriate for really small sets of single label | |
2409 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2410 | * taken before calling this function. | |
2411 | * | |
2412 | * Returns the label of the far end or NULL if it's not special. | |
2413 | */ | |
2414 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2415 | { | |
2416 | struct smk_net6addr *snp; | |
2417 | struct in6_addr *sap = &sip->sin6_addr; | |
2418 | int i; | |
2419 | int found = 0; | |
2420 | ||
2421 | /* | |
2422 | * It's local. Don't look for a host label. | |
2423 | */ | |
2424 | if (smk_ipv6_localhost(sip)) | |
2425 | return NULL; | |
2426 | ||
2427 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2428 | /* |
2429 | * If the label is NULL the entry has | |
2430 | * been renounced. Ignore it. | |
2431 | */ | |
2432 | if (snp->smk_label == NULL) | |
2433 | continue; | |
07feee8f PM |
2434 | /* |
2435 | * we break after finding the first match because | |
2436 | * the list is sorted from longest to shortest mask | |
2437 | * so we have found the most specific match | |
2438 | */ | |
21abb1ec | 2439 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2440 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2441 | snp->smk_host.s6_addr16[i]) { | |
2442 | found = 0; | |
2443 | break; | |
2444 | } | |
4303154e | 2445 | } |
21abb1ec CS |
2446 | if (found) |
2447 | return snp->smk_label; | |
2448 | } | |
07feee8f PM |
2449 | |
2450 | return NULL; | |
2451 | } | |
21abb1ec | 2452 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2453 | |
e114e473 CS |
2454 | /** |
2455 | * smack_netlabel - Set the secattr on a socket | |
2456 | * @sk: the socket | |
6d3dc07c | 2457 | * @labeled: socket label scheme |
e114e473 CS |
2458 | * |
2459 | * Convert the outbound smack value (smk_out) to a | |
2460 | * secattr and attach it to the socket. | |
2461 | * | |
2462 | * Returns 0 on success or an error code | |
2463 | */ | |
6d3dc07c | 2464 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2465 | { |
f7112e6c | 2466 | struct smack_known *skp; |
07feee8f | 2467 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2468 | int rc = 0; |
e114e473 | 2469 | |
6d3dc07c CS |
2470 | /* |
2471 | * Usually the netlabel code will handle changing the | |
2472 | * packet labeling based on the label. | |
2473 | * The case of a single label host is different, because | |
2474 | * a single label host should never get a labeled packet | |
2475 | * even though the label is usually associated with a packet | |
2476 | * label. | |
2477 | */ | |
2478 | local_bh_disable(); | |
2479 | bh_lock_sock_nested(sk); | |
2480 | ||
2481 | if (ssp->smk_out == smack_net_ambient || | |
2482 | labeled == SMACK_UNLABELED_SOCKET) | |
2483 | netlbl_sock_delattr(sk); | |
2484 | else { | |
2f823ff8 | 2485 | skp = ssp->smk_out; |
f7112e6c | 2486 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2487 | } |
2488 | ||
2489 | bh_unlock_sock(sk); | |
2490 | local_bh_enable(); | |
4bc87e62 | 2491 | |
e114e473 CS |
2492 | return rc; |
2493 | } | |
2494 | ||
07feee8f PM |
2495 | /** |
2496 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2497 | * @sk: the socket | |
2498 | * @sap: the destination address | |
2499 | * | |
2500 | * Set the correct secattr for the given socket based on the destination | |
2501 | * address and perform any outbound access checks needed. | |
2502 | * | |
2503 | * Returns 0 on success or an error code. | |
2504 | * | |
2505 | */ | |
2506 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2507 | { | |
2f823ff8 | 2508 | struct smack_known *skp; |
07feee8f PM |
2509 | int rc; |
2510 | int sk_lbl; | |
21c7eae2 | 2511 | struct smack_known *hkp; |
07feee8f | 2512 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2513 | struct smk_audit_info ad; |
07feee8f PM |
2514 | |
2515 | rcu_read_lock(); | |
21abb1ec | 2516 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2517 | if (hkp != NULL) { |
ecfcc53f | 2518 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2519 | struct lsm_network_audit net; |
2520 | ||
48c62af6 EP |
2521 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2522 | ad.a.u.net->family = sap->sin_family; | |
2523 | ad.a.u.net->dport = sap->sin_port; | |
2524 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2525 | #endif |
923e9a13 | 2526 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2527 | skp = ssp->smk_out; |
21c7eae2 LP |
2528 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2529 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2530 | } else { |
2531 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2532 | rc = 0; | |
2533 | } | |
2534 | rcu_read_unlock(); | |
2535 | if (rc != 0) | |
2536 | return rc; | |
2537 | ||
2538 | return smack_netlabel(sk, sk_lbl); | |
2539 | } | |
2540 | ||
21abb1ec CS |
2541 | #if IS_ENABLED(CONFIG_IPV6) |
2542 | /** | |
2543 | * smk_ipv6_check - check Smack access | |
2544 | * @subject: subject Smack label | |
2545 | * @object: object Smack label | |
2546 | * @address: address | |
2547 | * @act: the action being taken | |
2548 | * | |
2549 | * Check an IPv6 access | |
2550 | */ | |
2551 | static int smk_ipv6_check(struct smack_known *subject, | |
2552 | struct smack_known *object, | |
2553 | struct sockaddr_in6 *address, int act) | |
2554 | { | |
2555 | #ifdef CONFIG_AUDIT | |
2556 | struct lsm_network_audit net; | |
2557 | #endif | |
2558 | struct smk_audit_info ad; | |
2559 | int rc; | |
2560 | ||
2561 | #ifdef CONFIG_AUDIT | |
2562 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2563 | ad.a.u.net->family = PF_INET6; | |
2564 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2565 | if (act == SMK_RECEIVING) | |
2566 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2567 | else | |
2568 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2569 | #endif | |
2570 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2571 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2572 | return rc; | |
2573 | } | |
2574 | #endif /* CONFIG_IPV6 */ | |
2575 | ||
2576 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2577 | /** |
2578 | * smk_ipv6_port_label - Smack port access table management | |
2579 | * @sock: socket | |
2580 | * @address: address | |
2581 | * | |
2582 | * Create or update the port list entry | |
2583 | */ | |
2584 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2585 | { | |
2586 | struct sock *sk = sock->sk; | |
2587 | struct sockaddr_in6 *addr6; | |
2588 | struct socket_smack *ssp = sock->sk->sk_security; | |
2589 | struct smk_port_label *spp; | |
2590 | unsigned short port = 0; | |
2591 | ||
2592 | if (address == NULL) { | |
2593 | /* | |
2594 | * This operation is changing the Smack information | |
2595 | * on the bound socket. Take the changes to the port | |
2596 | * as well. | |
2597 | */ | |
3c7ce342 VG |
2598 | rcu_read_lock(); |
2599 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2600 | if (sk != spp->smk_sock) |
2601 | continue; | |
2602 | spp->smk_in = ssp->smk_in; | |
2603 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2604 | rcu_read_unlock(); |
c6739443 CS |
2605 | return; |
2606 | } | |
2607 | /* | |
2608 | * A NULL address is only used for updating existing | |
2609 | * bound entries. If there isn't one, it's OK. | |
2610 | */ | |
3c7ce342 | 2611 | rcu_read_unlock(); |
c6739443 CS |
2612 | return; |
2613 | } | |
2614 | ||
2615 | addr6 = (struct sockaddr_in6 *)address; | |
2616 | port = ntohs(addr6->sin6_port); | |
2617 | /* | |
2618 | * This is a special case that is safely ignored. | |
2619 | */ | |
2620 | if (port == 0) | |
2621 | return; | |
2622 | ||
2623 | /* | |
2624 | * Look for an existing port list entry. | |
2625 | * This is an indication that a port is getting reused. | |
2626 | */ | |
3c7ce342 VG |
2627 | rcu_read_lock(); |
2628 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2629 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2630 | continue; |
0c96d1f5 VG |
2631 | if (spp->smk_can_reuse != 1) { |
2632 | rcu_read_unlock(); | |
2633 | return; | |
2634 | } | |
c6739443 CS |
2635 | spp->smk_port = port; |
2636 | spp->smk_sock = sk; | |
2637 | spp->smk_in = ssp->smk_in; | |
2638 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2639 | spp->smk_can_reuse = 0; |
3c7ce342 | 2640 | rcu_read_unlock(); |
c6739443 CS |
2641 | return; |
2642 | } | |
3c7ce342 | 2643 | rcu_read_unlock(); |
c6739443 CS |
2644 | /* |
2645 | * A new port entry is required. | |
2646 | */ | |
2647 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2648 | if (spp == NULL) | |
2649 | return; | |
2650 | ||
2651 | spp->smk_port = port; | |
2652 | spp->smk_sock = sk; | |
2653 | spp->smk_in = ssp->smk_in; | |
2654 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2655 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2656 | spp->smk_can_reuse = 0; |
c6739443 | 2657 | |
3c7ce342 VG |
2658 | mutex_lock(&smack_ipv6_lock); |
2659 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2660 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2661 | return; |
2662 | } | |
2663 | ||
2664 | /** | |
2665 | * smk_ipv6_port_check - check Smack port access | |
2666 | * @sock: socket | |
2667 | * @address: address | |
2668 | * | |
2669 | * Create or update the port list entry | |
2670 | */ | |
6ea06247 | 2671 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2672 | int act) |
2673 | { | |
c6739443 CS |
2674 | struct smk_port_label *spp; |
2675 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2676 | struct smack_known *skp = NULL; |
2677 | unsigned short port; | |
21c7eae2 | 2678 | struct smack_known *object; |
c6739443 CS |
2679 | |
2680 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2681 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2682 | object = ssp->smk_in; |
c6739443 | 2683 | } else { |
2f823ff8 | 2684 | skp = ssp->smk_out; |
21abb1ec | 2685 | object = smack_ipv6host_label(address); |
c6739443 CS |
2686 | } |
2687 | ||
2688 | /* | |
21abb1ec | 2689 | * The other end is a single label host. |
c6739443 | 2690 | */ |
21abb1ec CS |
2691 | if (skp != NULL && object != NULL) |
2692 | return smk_ipv6_check(skp, object, address, act); | |
2693 | if (skp == NULL) | |
2694 | skp = smack_net_ambient; | |
2695 | if (object == NULL) | |
2696 | object = smack_net_ambient; | |
c6739443 CS |
2697 | |
2698 | /* | |
2699 | * It's remote, so port lookup does no good. | |
2700 | */ | |
21abb1ec CS |
2701 | if (!smk_ipv6_localhost(address)) |
2702 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2703 | |
2704 | /* | |
2705 | * It's local so the send check has to have passed. | |
2706 | */ | |
21abb1ec CS |
2707 | if (act == SMK_RECEIVING) |
2708 | return 0; | |
c6739443 | 2709 | |
21abb1ec | 2710 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2711 | rcu_read_lock(); |
2712 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2713 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2714 | continue; |
21c7eae2 | 2715 | object = spp->smk_in; |
c6739443 | 2716 | if (act == SMK_CONNECTING) |
54e70ec5 | 2717 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2718 | break; |
2719 | } | |
3c7ce342 | 2720 | rcu_read_unlock(); |
c6739443 | 2721 | |
21abb1ec | 2722 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2723 | } |
21abb1ec | 2724 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2725 | |
e114e473 CS |
2726 | /** |
2727 | * smack_inode_setsecurity - set smack xattrs | |
2728 | * @inode: the object | |
2729 | * @name: attribute name | |
2730 | * @value: attribute value | |
2731 | * @size: size of the attribute | |
2732 | * @flags: unused | |
2733 | * | |
2734 | * Sets the named attribute in the appropriate blob | |
2735 | * | |
2736 | * Returns 0 on success, or an error code | |
2737 | */ | |
2738 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2739 | const void *value, size_t size, int flags) | |
2740 | { | |
2f823ff8 | 2741 | struct smack_known *skp; |
e114e473 CS |
2742 | struct inode_smack *nsp = inode->i_security; |
2743 | struct socket_smack *ssp; | |
2744 | struct socket *sock; | |
4bc87e62 | 2745 | int rc = 0; |
e114e473 | 2746 | |
f7112e6c | 2747 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2748 | return -EINVAL; |
e114e473 | 2749 | |
2f823ff8 | 2750 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2751 | if (IS_ERR(skp)) |
2752 | return PTR_ERR(skp); | |
e114e473 CS |
2753 | |
2754 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2755 | nsp->smk_inode = skp; |
ddd29ec6 | 2756 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2757 | return 0; |
2758 | } | |
2759 | /* | |
2760 | * The rest of the Smack xattrs are only on sockets. | |
2761 | */ | |
2762 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2763 | return -EOPNOTSUPP; | |
2764 | ||
2765 | sock = SOCKET_I(inode); | |
2e1d146a | 2766 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2767 | return -EOPNOTSUPP; |
2768 | ||
2769 | ssp = sock->sk->sk_security; | |
2770 | ||
2771 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2772 | ssp->smk_in = skp; |
e114e473 | 2773 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2774 | ssp->smk_out = skp; |
c6739443 | 2775 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2776 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2777 | if (rc != 0) | |
2778 | printk(KERN_WARNING | |
2779 | "Smack: \"%s\" netlbl error %d.\n", | |
2780 | __func__, -rc); | |
2781 | } | |
e114e473 CS |
2782 | } else |
2783 | return -EOPNOTSUPP; | |
2784 | ||
21abb1ec | 2785 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2786 | if (sock->sk->sk_family == PF_INET6) |
2787 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2788 | #endif |
c6739443 | 2789 | |
e114e473 CS |
2790 | return 0; |
2791 | } | |
2792 | ||
2793 | /** | |
2794 | * smack_socket_post_create - finish socket setup | |
2795 | * @sock: the socket | |
2796 | * @family: protocol family | |
2797 | * @type: unused | |
2798 | * @protocol: unused | |
2799 | * @kern: unused | |
2800 | * | |
2801 | * Sets the netlabel information on the socket | |
2802 | * | |
2803 | * Returns 0 on success, and error code otherwise | |
2804 | */ | |
2805 | static int smack_socket_post_create(struct socket *sock, int family, | |
2806 | int type, int protocol, int kern) | |
2807 | { | |
7412301b ML |
2808 | struct socket_smack *ssp; |
2809 | ||
2810 | if (sock->sk == NULL) | |
2811 | return 0; | |
2812 | ||
2813 | /* | |
2814 | * Sockets created by kernel threads receive web label. | |
2815 | */ | |
2816 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2817 | ssp = sock->sk->sk_security; | |
2818 | ssp->smk_in = &smack_known_web; | |
2819 | ssp->smk_out = &smack_known_web; | |
2820 | } | |
2821 | ||
2822 | if (family != PF_INET) | |
e114e473 CS |
2823 | return 0; |
2824 | /* | |
2825 | * Set the outbound netlbl. | |
2826 | */ | |
6d3dc07c CS |
2827 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2828 | } | |
2829 | ||
21abb1ec | 2830 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2831 | /** |
2832 | * smack_socket_bind - record port binding information. | |
2833 | * @sock: the socket | |
2834 | * @address: the port address | |
2835 | * @addrlen: size of the address | |
2836 | * | |
2837 | * Records the label bound to a port. | |
2838 | * | |
2839 | * Returns 0 | |
2840 | */ | |
2841 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2842 | int addrlen) | |
2843 | { | |
2844 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2845 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2846 | return 0; |
2847 | } | |
21abb1ec | 2848 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2849 | |
6d3dc07c CS |
2850 | /** |
2851 | * smack_socket_connect - connect access check | |
2852 | * @sock: the socket | |
2853 | * @sap: the other end | |
2854 | * @addrlen: size of sap | |
2855 | * | |
2856 | * Verifies that a connection may be possible | |
2857 | * | |
2858 | * Returns 0 on success, and error code otherwise | |
2859 | */ | |
2860 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2861 | int addrlen) | |
2862 | { | |
c6739443 | 2863 | int rc = 0; |
21abb1ec CS |
2864 | #if IS_ENABLED(CONFIG_IPV6) |
2865 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2866 | #endif | |
2867 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2868 | struct smack_known *rsp; | |
da49b5da | 2869 | struct socket_smack *ssp; |
21abb1ec | 2870 | #endif |
c6739443 CS |
2871 | |
2872 | if (sock->sk == NULL) | |
6d3dc07c | 2873 | return 0; |
6d3dc07c | 2874 | |
da49b5da VG |
2875 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2876 | ssp = sock->sk->sk_security; | |
2877 | #endif | |
2878 | ||
c6739443 CS |
2879 | switch (sock->sk->sk_family) { |
2880 | case PF_INET: | |
2881 | if (addrlen < sizeof(struct sockaddr_in)) | |
2882 | return -EINVAL; | |
2883 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2884 | break; | |
2885 | case PF_INET6: | |
2886 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2887 | return -EINVAL; | |
21abb1ec CS |
2888 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2889 | rsp = smack_ipv6host_label(sip); | |
2890 | if (rsp != NULL) | |
2891 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2892 | SMK_CONNECTING); |
21abb1ec CS |
2893 | #endif |
2894 | #ifdef SMACK_IPV6_PORT_LABELING | |
2895 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2896 | #endif | |
c6739443 CS |
2897 | break; |
2898 | } | |
2899 | return rc; | |
e114e473 CS |
2900 | } |
2901 | ||
2902 | /** | |
2903 | * smack_flags_to_may - convert S_ to MAY_ values | |
2904 | * @flags: the S_ value | |
2905 | * | |
2906 | * Returns the equivalent MAY_ value | |
2907 | */ | |
2908 | static int smack_flags_to_may(int flags) | |
2909 | { | |
2910 | int may = 0; | |
2911 | ||
2912 | if (flags & S_IRUGO) | |
2913 | may |= MAY_READ; | |
2914 | if (flags & S_IWUGO) | |
2915 | may |= MAY_WRITE; | |
2916 | if (flags & S_IXUGO) | |
2917 | may |= MAY_EXEC; | |
2918 | ||
2919 | return may; | |
2920 | } | |
2921 | ||
2922 | /** | |
2923 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2924 | * @msg: the object | |
2925 | * | |
2926 | * Returns 0 | |
2927 | */ | |
2928 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2929 | { | |
2f823ff8 CS |
2930 | struct smack_known *skp = smk_of_current(); |
2931 | ||
21c7eae2 | 2932 | msg->security = skp; |
e114e473 CS |
2933 | return 0; |
2934 | } | |
2935 | ||
2936 | /** | |
2937 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2938 | * @msg: the object | |
2939 | * | |
2940 | * Clears the blob pointer | |
2941 | */ | |
2942 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2943 | { | |
2944 | msg->security = NULL; | |
2945 | } | |
2946 | ||
2947 | /** | |
2948 | * smack_of_shm - the smack pointer for the shm | |
2949 | * @shp: the object | |
2950 | * | |
2951 | * Returns a pointer to the smack value | |
2952 | */ | |
21c7eae2 | 2953 | static struct smack_known *smack_of_shm(struct shmid_kernel *shp) |
e114e473 | 2954 | { |
21c7eae2 | 2955 | return (struct smack_known *)shp->shm_perm.security; |
e114e473 CS |
2956 | } |
2957 | ||
2958 | /** | |
2959 | * smack_shm_alloc_security - Set the security blob for shm | |
2960 | * @shp: the object | |
2961 | * | |
2962 | * Returns 0 | |
2963 | */ | |
2964 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2965 | { | |
2966 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2967 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2968 | |
21c7eae2 | 2969 | isp->security = skp; |
e114e473 CS |
2970 | return 0; |
2971 | } | |
2972 | ||
2973 | /** | |
2974 | * smack_shm_free_security - Clear the security blob for shm | |
2975 | * @shp: the object | |
2976 | * | |
2977 | * Clears the blob pointer | |
2978 | */ | |
2979 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2980 | { | |
2981 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2982 | ||
2983 | isp->security = NULL; | |
2984 | } | |
2985 | ||
ecfcc53f EB |
2986 | /** |
2987 | * smk_curacc_shm : check if current has access on shm | |
2988 | * @shp : the object | |
2989 | * @access : access requested | |
2990 | * | |
2991 | * Returns 0 if current has the requested access, error code otherwise | |
2992 | */ | |
2993 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2994 | { | |
21c7eae2 | 2995 | struct smack_known *ssp = smack_of_shm(shp); |
ecfcc53f | 2996 | struct smk_audit_info ad; |
d166c802 | 2997 | int rc; |
ecfcc53f EB |
2998 | |
2999 | #ifdef CONFIG_AUDIT | |
3000 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3001 | ad.a.u.ipc_id = shp->shm_perm.id; | |
3002 | #endif | |
d166c802 CS |
3003 | rc = smk_curacc(ssp, access, &ad); |
3004 | rc = smk_bu_current("shm", ssp, access, rc); | |
3005 | return rc; | |
ecfcc53f EB |
3006 | } |
3007 | ||
e114e473 CS |
3008 | /** |
3009 | * smack_shm_associate - Smack access check for shm | |
3010 | * @shp: the object | |
3011 | * @shmflg: access requested | |
3012 | * | |
3013 | * Returns 0 if current has the requested access, error code otherwise | |
3014 | */ | |
3015 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
3016 | { | |
e114e473 CS |
3017 | int may; |
3018 | ||
3019 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 3020 | return smk_curacc_shm(shp, may); |
e114e473 CS |
3021 | } |
3022 | ||
3023 | /** | |
3024 | * smack_shm_shmctl - Smack access check for shm | |
3025 | * @shp: the object | |
3026 | * @cmd: what it wants to do | |
3027 | * | |
3028 | * Returns 0 if current has the requested access, error code otherwise | |
3029 | */ | |
3030 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
3031 | { | |
e114e473 CS |
3032 | int may; |
3033 | ||
3034 | switch (cmd) { | |
3035 | case IPC_STAT: | |
3036 | case SHM_STAT: | |
3037 | may = MAY_READ; | |
3038 | break; | |
3039 | case IPC_SET: | |
3040 | case SHM_LOCK: | |
3041 | case SHM_UNLOCK: | |
3042 | case IPC_RMID: | |
3043 | may = MAY_READWRITE; | |
3044 | break; | |
3045 | case IPC_INFO: | |
3046 | case SHM_INFO: | |
3047 | /* | |
3048 | * System level information. | |
3049 | */ | |
3050 | return 0; | |
3051 | default: | |
3052 | return -EINVAL; | |
3053 | } | |
ecfcc53f | 3054 | return smk_curacc_shm(shp, may); |
e114e473 CS |
3055 | } |
3056 | ||
3057 | /** | |
3058 | * smack_shm_shmat - Smack access for shmat | |
3059 | * @shp: the object | |
3060 | * @shmaddr: unused | |
3061 | * @shmflg: access requested | |
3062 | * | |
3063 | * Returns 0 if current has the requested access, error code otherwise | |
3064 | */ | |
3065 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
3066 | int shmflg) | |
3067 | { | |
e114e473 CS |
3068 | int may; |
3069 | ||
3070 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 3071 | return smk_curacc_shm(shp, may); |
e114e473 CS |
3072 | } |
3073 | ||
3074 | /** | |
3075 | * smack_of_sem - the smack pointer for the sem | |
3076 | * @sma: the object | |
3077 | * | |
3078 | * Returns a pointer to the smack value | |
3079 | */ | |
21c7eae2 | 3080 | static struct smack_known *smack_of_sem(struct sem_array *sma) |
e114e473 | 3081 | { |
21c7eae2 | 3082 | return (struct smack_known *)sma->sem_perm.security; |
e114e473 CS |
3083 | } |
3084 | ||
3085 | /** | |
3086 | * smack_sem_alloc_security - Set the security blob for sem | |
3087 | * @sma: the object | |
3088 | * | |
3089 | * Returns 0 | |
3090 | */ | |
3091 | static int smack_sem_alloc_security(struct sem_array *sma) | |
3092 | { | |
3093 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 3094 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3095 | |
21c7eae2 | 3096 | isp->security = skp; |
e114e473 CS |
3097 | return 0; |
3098 | } | |
3099 | ||
3100 | /** | |
3101 | * smack_sem_free_security - Clear the security blob for sem | |
3102 | * @sma: the object | |
3103 | * | |
3104 | * Clears the blob pointer | |
3105 | */ | |
3106 | static void smack_sem_free_security(struct sem_array *sma) | |
3107 | { | |
3108 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
3109 | ||
3110 | isp->security = NULL; | |
3111 | } | |
3112 | ||
ecfcc53f EB |
3113 | /** |
3114 | * smk_curacc_sem : check if current has access on sem | |
3115 | * @sma : the object | |
3116 | * @access : access requested | |
3117 | * | |
3118 | * Returns 0 if current has the requested access, error code otherwise | |
3119 | */ | |
3120 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
3121 | { | |
21c7eae2 | 3122 | struct smack_known *ssp = smack_of_sem(sma); |
ecfcc53f | 3123 | struct smk_audit_info ad; |
d166c802 | 3124 | int rc; |
ecfcc53f EB |
3125 | |
3126 | #ifdef CONFIG_AUDIT | |
3127 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3128 | ad.a.u.ipc_id = sma->sem_perm.id; | |
3129 | #endif | |
d166c802 CS |
3130 | rc = smk_curacc(ssp, access, &ad); |
3131 | rc = smk_bu_current("sem", ssp, access, rc); | |
3132 | return rc; | |
ecfcc53f EB |
3133 | } |
3134 | ||
e114e473 CS |
3135 | /** |
3136 | * smack_sem_associate - Smack access check for sem | |
3137 | * @sma: the object | |
3138 | * @semflg: access requested | |
3139 | * | |
3140 | * Returns 0 if current has the requested access, error code otherwise | |
3141 | */ | |
3142 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
3143 | { | |
e114e473 CS |
3144 | int may; |
3145 | ||
3146 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 3147 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3148 | } |
3149 | ||
3150 | /** | |
3151 | * smack_sem_shmctl - Smack access check for sem | |
3152 | * @sma: the object | |
3153 | * @cmd: what it wants to do | |
3154 | * | |
3155 | * Returns 0 if current has the requested access, error code otherwise | |
3156 | */ | |
3157 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
3158 | { | |
e114e473 CS |
3159 | int may; |
3160 | ||
3161 | switch (cmd) { | |
3162 | case GETPID: | |
3163 | case GETNCNT: | |
3164 | case GETZCNT: | |
3165 | case GETVAL: | |
3166 | case GETALL: | |
3167 | case IPC_STAT: | |
3168 | case SEM_STAT: | |
3169 | may = MAY_READ; | |
3170 | break; | |
3171 | case SETVAL: | |
3172 | case SETALL: | |
3173 | case IPC_RMID: | |
3174 | case IPC_SET: | |
3175 | may = MAY_READWRITE; | |
3176 | break; | |
3177 | case IPC_INFO: | |
3178 | case SEM_INFO: | |
3179 | /* | |
3180 | * System level information | |
3181 | */ | |
3182 | return 0; | |
3183 | default: | |
3184 | return -EINVAL; | |
3185 | } | |
3186 | ||
ecfcc53f | 3187 | return smk_curacc_sem(sma, may); |
e114e473 CS |
3188 | } |
3189 | ||
3190 | /** | |
3191 | * smack_sem_semop - Smack checks of semaphore operations | |
3192 | * @sma: the object | |
3193 | * @sops: unused | |
3194 | * @nsops: unused | |
3195 | * @alter: unused | |
3196 | * | |
3197 | * Treated as read and write in all cases. | |
3198 | * | |
3199 | * Returns 0 if access is allowed, error code otherwise | |
3200 | */ | |
3201 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
3202 | unsigned nsops, int alter) | |
3203 | { | |
ecfcc53f | 3204 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
3205 | } |
3206 | ||
3207 | /** | |
3208 | * smack_msg_alloc_security - Set the security blob for msg | |
3209 | * @msq: the object | |
3210 | * | |
3211 | * Returns 0 | |
3212 | */ | |
3213 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
3214 | { | |
3215 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 3216 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3217 | |
21c7eae2 | 3218 | kisp->security = skp; |
e114e473 CS |
3219 | return 0; |
3220 | } | |
3221 | ||
3222 | /** | |
3223 | * smack_msg_free_security - Clear the security blob for msg | |
3224 | * @msq: the object | |
3225 | * | |
3226 | * Clears the blob pointer | |
3227 | */ | |
3228 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
3229 | { | |
3230 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
3231 | ||
3232 | kisp->security = NULL; | |
3233 | } | |
3234 | ||
3235 | /** | |
3236 | * smack_of_msq - the smack pointer for the msq | |
3237 | * @msq: the object | |
3238 | * | |
21c7eae2 | 3239 | * Returns a pointer to the smack label entry |
e114e473 | 3240 | */ |
21c7eae2 | 3241 | static struct smack_known *smack_of_msq(struct msg_queue *msq) |
e114e473 | 3242 | { |
21c7eae2 | 3243 | return (struct smack_known *)msq->q_perm.security; |
e114e473 CS |
3244 | } |
3245 | ||
ecfcc53f EB |
3246 | /** |
3247 | * smk_curacc_msq : helper to check if current has access on msq | |
3248 | * @msq : the msq | |
3249 | * @access : access requested | |
3250 | * | |
3251 | * return 0 if current has access, error otherwise | |
3252 | */ | |
3253 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
3254 | { | |
21c7eae2 | 3255 | struct smack_known *msp = smack_of_msq(msq); |
ecfcc53f | 3256 | struct smk_audit_info ad; |
d166c802 | 3257 | int rc; |
ecfcc53f EB |
3258 | |
3259 | #ifdef CONFIG_AUDIT | |
3260 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3261 | ad.a.u.ipc_id = msq->q_perm.id; | |
3262 | #endif | |
d166c802 CS |
3263 | rc = smk_curacc(msp, access, &ad); |
3264 | rc = smk_bu_current("msq", msp, access, rc); | |
3265 | return rc; | |
ecfcc53f EB |
3266 | } |
3267 | ||
e114e473 CS |
3268 | /** |
3269 | * smack_msg_queue_associate - Smack access check for msg_queue | |
3270 | * @msq: the object | |
3271 | * @msqflg: access requested | |
3272 | * | |
3273 | * Returns 0 if current has the requested access, error code otherwise | |
3274 | */ | |
3275 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
3276 | { | |
e114e473 CS |
3277 | int may; |
3278 | ||
3279 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 3280 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3281 | } |
3282 | ||
3283 | /** | |
3284 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
3285 | * @msq: the object | |
3286 | * @cmd: what it wants to do | |
3287 | * | |
3288 | * Returns 0 if current has the requested access, error code otherwise | |
3289 | */ | |
3290 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
3291 | { | |
e114e473 CS |
3292 | int may; |
3293 | ||
3294 | switch (cmd) { | |
3295 | case IPC_STAT: | |
3296 | case MSG_STAT: | |
3297 | may = MAY_READ; | |
3298 | break; | |
3299 | case IPC_SET: | |
3300 | case IPC_RMID: | |
3301 | may = MAY_READWRITE; | |
3302 | break; | |
3303 | case IPC_INFO: | |
3304 | case MSG_INFO: | |
3305 | /* | |
3306 | * System level information | |
3307 | */ | |
3308 | return 0; | |
3309 | default: | |
3310 | return -EINVAL; | |
3311 | } | |
3312 | ||
ecfcc53f | 3313 | return smk_curacc_msq(msq, may); |
e114e473 CS |
3314 | } |
3315 | ||
3316 | /** | |
3317 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3318 | * @msq: the object | |
3319 | * @msg: unused | |
3320 | * @msqflg: access requested | |
3321 | * | |
3322 | * Returns 0 if current has the requested access, error code otherwise | |
3323 | */ | |
3324 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
3325 | int msqflg) | |
3326 | { | |
ecfcc53f | 3327 | int may; |
e114e473 | 3328 | |
ecfcc53f EB |
3329 | may = smack_flags_to_may(msqflg); |
3330 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
3331 | } |
3332 | ||
3333 | /** | |
3334 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
3335 | * @msq: the object | |
3336 | * @msg: unused | |
3337 | * @target: unused | |
3338 | * @type: unused | |
3339 | * @mode: unused | |
3340 | * | |
3341 | * Returns 0 if current has read and write access, error code otherwise | |
3342 | */ | |
3343 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
3344 | struct task_struct *target, long type, int mode) | |
3345 | { | |
ecfcc53f | 3346 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
3347 | } |
3348 | ||
3349 | /** | |
3350 | * smack_ipc_permission - Smack access for ipc_permission() | |
3351 | * @ipp: the object permissions | |
3352 | * @flag: access requested | |
3353 | * | |
3354 | * Returns 0 if current has read and write access, error code otherwise | |
3355 | */ | |
3356 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3357 | { | |
21c7eae2 | 3358 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3359 | int may = smack_flags_to_may(flag); |
3360 | struct smk_audit_info ad; | |
d166c802 | 3361 | int rc; |
e114e473 | 3362 | |
ecfcc53f EB |
3363 | #ifdef CONFIG_AUDIT |
3364 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3365 | ad.a.u.ipc_id = ipp->id; | |
3366 | #endif | |
21c7eae2 LP |
3367 | rc = smk_curacc(iskp, may, &ad); |
3368 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3369 | return rc; |
e114e473 CS |
3370 | } |
3371 | ||
d20bdda6 AD |
3372 | /** |
3373 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3374 | * @ipp: the object permissions |
d20bdda6 AD |
3375 | * @secid: where result will be saved |
3376 | */ | |
3377 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3378 | { | |
21c7eae2 | 3379 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3380 | |
21c7eae2 | 3381 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3382 | } |
3383 | ||
e114e473 CS |
3384 | /** |
3385 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3386 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3387 | * @inode: the object |
3388 | * | |
3389 | * Set the inode's security blob if it hasn't been done already. | |
3390 | */ | |
3391 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3392 | { | |
3393 | struct super_block *sbp; | |
3394 | struct superblock_smack *sbsp; | |
3395 | struct inode_smack *isp; | |
2f823ff8 CS |
3396 | struct smack_known *skp; |
3397 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3398 | struct smack_known *final; |
5c6d1125 JS |
3399 | char trattr[TRANS_TRUE_SIZE]; |
3400 | int transflag = 0; | |
2267b13a | 3401 | int rc; |
e114e473 CS |
3402 | struct dentry *dp; |
3403 | ||
3404 | if (inode == NULL) | |
3405 | return; | |
3406 | ||
3407 | isp = inode->i_security; | |
3408 | ||
3409 | mutex_lock(&isp->smk_lock); | |
3410 | /* | |
3411 | * If the inode is already instantiated | |
3412 | * take the quick way out | |
3413 | */ | |
3414 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3415 | goto unlockandout; | |
3416 | ||
3417 | sbp = inode->i_sb; | |
3418 | sbsp = sbp->s_security; | |
3419 | /* | |
3420 | * We're going to use the superblock default label | |
3421 | * if there's no label on the file. | |
3422 | */ | |
3423 | final = sbsp->smk_default; | |
3424 | ||
e97dcb0e CS |
3425 | /* |
3426 | * If this is the root inode the superblock | |
3427 | * may be in the process of initialization. | |
3428 | * If that is the case use the root value out | |
3429 | * of the superblock. | |
3430 | */ | |
3431 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3432 | switch (sbp->s_magic) { |
3433 | case CGROUP_SUPER_MAGIC: | |
36ea735b CS |
3434 | /* |
3435 | * The cgroup filesystem is never mounted, | |
3436 | * so there's no opportunity to set the mount | |
3437 | * options. | |
3438 | */ | |
21c7eae2 LP |
3439 | sbsp->smk_root = &smack_known_star; |
3440 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3441 | isp->smk_inode = sbsp->smk_root; |
3442 | break; | |
3443 | case TMPFS_MAGIC: | |
3444 | /* | |
3445 | * What about shmem/tmpfs anonymous files with dentry | |
3446 | * obtained from d_alloc_pseudo()? | |
3447 | */ | |
3448 | isp->smk_inode = smk_of_current(); | |
3449 | break; | |
8da4aba5 RK |
3450 | case PIPEFS_MAGIC: |
3451 | isp->smk_inode = smk_of_current(); | |
3452 | break; | |
805b65a8 RK |
3453 | case SOCKFS_MAGIC: |
3454 | /* | |
3455 | * Socket access is controlled by the socket | |
3456 | * structures associated with the task involved. | |
3457 | */ | |
3458 | isp->smk_inode = &smack_known_star; | |
3459 | break; | |
1d8c2326 ŁS |
3460 | default: |
3461 | isp->smk_inode = sbsp->smk_root; | |
3462 | break; | |
36ea735b | 3463 | } |
e97dcb0e CS |
3464 | isp->smk_flags |= SMK_INODE_INSTANT; |
3465 | goto unlockandout; | |
3466 | } | |
3467 | ||
e114e473 CS |
3468 | /* |
3469 | * This is pretty hackish. | |
3470 | * Casey says that we shouldn't have to do | |
3471 | * file system specific code, but it does help | |
3472 | * with keeping it simple. | |
3473 | */ | |
3474 | switch (sbp->s_magic) { | |
3475 | case SMACK_MAGIC: | |
36ea735b | 3476 | case CGROUP_SUPER_MAGIC: |
e114e473 | 3477 | /* |
25985edc | 3478 | * Casey says that it's a little embarrassing |
e114e473 CS |
3479 | * that the smack file system doesn't do |
3480 | * extended attributes. | |
36ea735b | 3481 | * |
36ea735b | 3482 | * Cgroupfs is special |
e114e473 | 3483 | */ |
21c7eae2 | 3484 | final = &smack_known_star; |
e114e473 CS |
3485 | break; |
3486 | case DEVPTS_SUPER_MAGIC: | |
3487 | /* | |
3488 | * devpts seems content with the label of the task. | |
3489 | * Programs that change smack have to treat the | |
3490 | * pty with respect. | |
3491 | */ | |
21c7eae2 | 3492 | final = ckp; |
e114e473 | 3493 | break; |
e114e473 CS |
3494 | case PROC_SUPER_MAGIC: |
3495 | /* | |
3496 | * Casey says procfs appears not to care. | |
3497 | * The superblock default suffices. | |
3498 | */ | |
3499 | break; | |
3500 | case TMPFS_MAGIC: | |
3501 | /* | |
3502 | * Device labels should come from the filesystem, | |
3503 | * but watch out, because they're volitile, | |
3504 | * getting recreated on every reboot. | |
3505 | */ | |
21c7eae2 | 3506 | final = &smack_known_star; |
e114e473 CS |
3507 | /* |
3508 | * No break. | |
3509 | * | |
3510 | * If a smack value has been set we want to use it, | |
3511 | * but since tmpfs isn't giving us the opportunity | |
3512 | * to set mount options simulate setting the | |
3513 | * superblock default. | |
3514 | */ | |
3515 | default: | |
3516 | /* | |
3517 | * This isn't an understood special case. | |
3518 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3519 | */ |
3520 | ||
3521 | /* | |
3522 | * UNIX domain sockets use lower level socket data. | |
3523 | */ | |
3524 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3525 | final = &smack_known_star; |
b4e0d5f0 CS |
3526 | break; |
3527 | } | |
3528 | /* | |
e114e473 CS |
3529 | * No xattr support means, alas, no SMACK label. |
3530 | * Use the aforeapplied default. | |
3531 | * It would be curious if the label of the task | |
3532 | * does not match that assigned. | |
3533 | */ | |
5d6c3191 AG |
3534 | if (!(inode->i_opflags & IOP_XATTR)) |
3535 | break; | |
e114e473 CS |
3536 | /* |
3537 | * Get the dentry for xattr. | |
3538 | */ | |
3e62cbb8 | 3539 | dp = dget(opt_dentry); |
2f823ff8 | 3540 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3541 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3542 | final = skp; |
2267b13a CS |
3543 | |
3544 | /* | |
3545 | * Transmuting directory | |
3546 | */ | |
3547 | if (S_ISDIR(inode->i_mode)) { | |
3548 | /* | |
3549 | * If this is a new directory and the label was | |
3550 | * transmuted when the inode was initialized | |
3551 | * set the transmute attribute on the directory | |
3552 | * and mark the inode. | |
3553 | * | |
3554 | * If there is a transmute attribute on the | |
3555 | * directory mark the inode. | |
3556 | */ | |
3557 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3558 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
5d6c3191 | 3559 | rc = __vfs_setxattr(dp, inode, |
5c6d1125 | 3560 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3561 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3562 | 0); | |
3563 | } else { | |
5d6c3191 | 3564 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3565 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3566 | TRANS_TRUE_SIZE); | |
3567 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3568 | TRANS_TRUE_SIZE) != 0) | |
3569 | rc = -EINVAL; | |
5c6d1125 | 3570 | } |
2267b13a CS |
3571 | if (rc >= 0) |
3572 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3573 | } |
809c02e0 SF |
3574 | /* |
3575 | * Don't let the exec or mmap label be "*" or "@". | |
3576 | */ | |
3577 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3578 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3579 | skp == &smack_known_web) | |
3580 | skp = NULL; | |
3581 | isp->smk_task = skp; | |
e774ad68 | 3582 | |
19760ad0 | 3583 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3584 | if (IS_ERR(skp) || skp == &smack_known_star || |
3585 | skp == &smack_known_web) | |
19760ad0 CS |
3586 | skp = NULL; |
3587 | isp->smk_mmap = skp; | |
676dac4b | 3588 | |
e114e473 CS |
3589 | dput(dp); |
3590 | break; | |
3591 | } | |
3592 | ||
3593 | if (final == NULL) | |
21c7eae2 | 3594 | isp->smk_inode = ckp; |
e114e473 CS |
3595 | else |
3596 | isp->smk_inode = final; | |
3597 | ||
5c6d1125 | 3598 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3599 | |
3600 | unlockandout: | |
3601 | mutex_unlock(&isp->smk_lock); | |
3602 | return; | |
3603 | } | |
3604 | ||
3605 | /** | |
3606 | * smack_getprocattr - Smack process attribute access | |
3607 | * @p: the object task | |
3608 | * @name: the name of the attribute in /proc/.../attr | |
3609 | * @value: where to put the result | |
3610 | * | |
3611 | * Places a copy of the task Smack into value | |
3612 | * | |
3613 | * Returns the length of the smack label or an error code | |
3614 | */ | |
3615 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3616 | { | |
6d1cff2a | 3617 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3618 | char *cp; |
3619 | int slen; | |
3620 | ||
3621 | if (strcmp(name, "current") != 0) | |
3622 | return -EINVAL; | |
3623 | ||
2f823ff8 | 3624 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3625 | if (cp == NULL) |
3626 | return -ENOMEM; | |
3627 | ||
3628 | slen = strlen(cp); | |
3629 | *value = cp; | |
3630 | return slen; | |
3631 | } | |
3632 | ||
3633 | /** | |
3634 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3635 | * @name: the name of the attribute in /proc/.../attr |
3636 | * @value: the value to set | |
3637 | * @size: the size of the value | |
3638 | * | |
3639 | * Sets the Smack value of the task. Only setting self | |
3640 | * is permitted and only with privilege | |
3641 | * | |
3642 | * Returns the length of the smack label or an error code | |
3643 | */ | |
b21507e2 | 3644 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3645 | { |
38416e53 | 3646 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3647 | struct cred *new; |
2f823ff8 | 3648 | struct smack_known *skp; |
38416e53 ZJ |
3649 | struct smack_known_list_elem *sklep; |
3650 | int rc; | |
e114e473 | 3651 | |
38416e53 | 3652 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3653 | return -EPERM; |
3654 | ||
f7112e6c | 3655 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3656 | return -EINVAL; |
3657 | ||
3658 | if (strcmp(name, "current") != 0) | |
3659 | return -EINVAL; | |
3660 | ||
2f823ff8 | 3661 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3662 | if (IS_ERR(skp)) |
3663 | return PTR_ERR(skp); | |
e114e473 | 3664 | |
6d3dc07c | 3665 | /* |
7128ea15 HS |
3666 | * No process is ever allowed the web ("@") label |
3667 | * and the star ("*") label. | |
6d3dc07c | 3668 | */ |
7128ea15 HS |
3669 | if (skp == &smack_known_web || skp == &smack_known_star) |
3670 | return -EINVAL; | |
6d3dc07c | 3671 | |
38416e53 ZJ |
3672 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3673 | rc = -EPERM; | |
3674 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3675 | if (sklep->smk_label == skp) { | |
3676 | rc = 0; | |
3677 | break; | |
3678 | } | |
3679 | if (rc) | |
3680 | return rc; | |
3681 | } | |
3682 | ||
d84f4f99 | 3683 | new = prepare_creds(); |
6d3dc07c | 3684 | if (new == NULL) |
d84f4f99 | 3685 | return -ENOMEM; |
7898e1f8 | 3686 | |
46a2f3b9 | 3687 | tsp = new->security; |
2f823ff8 | 3688 | tsp->smk_task = skp; |
38416e53 ZJ |
3689 | /* |
3690 | * process can change its label only once | |
3691 | */ | |
3692 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3693 | |
d84f4f99 | 3694 | commit_creds(new); |
e114e473 CS |
3695 | return size; |
3696 | } | |
3697 | ||
3698 | /** | |
3699 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3700 | * @sock: one sock |
3701 | * @other: the other sock | |
e114e473 CS |
3702 | * @newsk: unused |
3703 | * | |
3704 | * Return 0 if a subject with the smack of sock could access | |
3705 | * an object with the smack of other, otherwise an error code | |
3706 | */ | |
3610cda5 DM |
3707 | static int smack_unix_stream_connect(struct sock *sock, |
3708 | struct sock *other, struct sock *newsk) | |
e114e473 | 3709 | { |
2f823ff8 | 3710 | struct smack_known *skp; |
54e70ec5 | 3711 | struct smack_known *okp; |
d2e7ad19 JM |
3712 | struct socket_smack *ssp = sock->sk_security; |
3713 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3714 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3715 | struct smk_audit_info ad; |
b4e0d5f0 | 3716 | int rc = 0; |
923e9a13 KC |
3717 | #ifdef CONFIG_AUDIT |
3718 | struct lsm_network_audit net; | |
923e9a13 | 3719 | #endif |
b4e0d5f0 | 3720 | |
2f823ff8 CS |
3721 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3722 | skp = ssp->smk_out; | |
96be7b54 | 3723 | okp = osp->smk_in; |
54e70ec5 CS |
3724 | #ifdef CONFIG_AUDIT |
3725 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3726 | smk_ad_setfield_u_net_sk(&ad, other); | |
3727 | #endif | |
21c7eae2 LP |
3728 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3729 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3730 | if (rc == 0) { |
96be7b54 ZJ |
3731 | okp = osp->smk_out; |
3732 | skp = ssp->smk_in; | |
138a868f | 3733 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3734 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3735 | MAY_WRITE, rc); |
3736 | } | |
2f823ff8 | 3737 | } |
b4e0d5f0 | 3738 | |
975d5e55 CS |
3739 | /* |
3740 | * Cross reference the peer labels for SO_PEERSEC. | |
3741 | */ | |
3742 | if (rc == 0) { | |
54e70ec5 CS |
3743 | nsp->smk_packet = ssp->smk_out; |
3744 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3745 | } |
3746 | ||
b4e0d5f0 | 3747 | return rc; |
e114e473 CS |
3748 | } |
3749 | ||
3750 | /** | |
3751 | * smack_unix_may_send - Smack access on UDS | |
3752 | * @sock: one socket | |
3753 | * @other: the other socket | |
3754 | * | |
3755 | * Return 0 if a subject with the smack of sock could access | |
3756 | * an object with the smack of other, otherwise an error code | |
3757 | */ | |
3758 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3759 | { | |
b4e0d5f0 CS |
3760 | struct socket_smack *ssp = sock->sk->sk_security; |
3761 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3762 | struct smk_audit_info ad; |
d166c802 | 3763 | int rc; |
e114e473 | 3764 | |
923e9a13 KC |
3765 | #ifdef CONFIG_AUDIT |
3766 | struct lsm_network_audit net; | |
3767 | ||
48c62af6 | 3768 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3769 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3770 | #endif |
b4e0d5f0 | 3771 | |
2f823ff8 CS |
3772 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3773 | return 0; | |
b4e0d5f0 | 3774 | |
21c7eae2 LP |
3775 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3776 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3777 | return rc; |
e114e473 CS |
3778 | } |
3779 | ||
6d3dc07c CS |
3780 | /** |
3781 | * smack_socket_sendmsg - Smack check based on destination host | |
3782 | * @sock: the socket | |
251a2a95 | 3783 | * @msg: the message |
6d3dc07c CS |
3784 | * @size: the size of the message |
3785 | * | |
c6739443 CS |
3786 | * Return 0 if the current subject can write to the destination host. |
3787 | * For IPv4 this is only a question if the destination is a single label host. | |
3788 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3789 | */ |
3790 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3791 | int size) | |
3792 | { | |
3793 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3794 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3795 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3796 | #endif |
3797 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3798 | struct socket_smack *ssp = sock->sk->sk_security; | |
3799 | struct smack_known *rsp; | |
3800 | #endif | |
c6739443 | 3801 | int rc = 0; |
6d3dc07c CS |
3802 | |
3803 | /* | |
3804 | * Perfectly reasonable for this to be NULL | |
3805 | */ | |
c6739443 | 3806 | if (sip == NULL) |
6d3dc07c CS |
3807 | return 0; |
3808 | ||
81bd0d56 | 3809 | switch (sock->sk->sk_family) { |
c6739443 CS |
3810 | case AF_INET: |
3811 | rc = smack_netlabel_send(sock->sk, sip); | |
3812 | break; | |
3813 | case AF_INET6: | |
21abb1ec CS |
3814 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3815 | rsp = smack_ipv6host_label(sap); | |
3816 | if (rsp != NULL) | |
3817 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3818 | SMK_CONNECTING); | |
3819 | #endif | |
3820 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3821 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3822 | #endif |
c6739443 CS |
3823 | break; |
3824 | } | |
3825 | return rc; | |
6d3dc07c CS |
3826 | } |
3827 | ||
e114e473 | 3828 | /** |
251a2a95 | 3829 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3830 | * @sap: netlabel secattr |
272cd7a8 | 3831 | * @ssp: socket security information |
e114e473 | 3832 | * |
2f823ff8 | 3833 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3834 | */ |
2f823ff8 CS |
3835 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3836 | struct socket_smack *ssp) | |
e114e473 | 3837 | { |
2f823ff8 | 3838 | struct smack_known *skp; |
f7112e6c | 3839 | int found = 0; |
677264e8 CS |
3840 | int acat; |
3841 | int kcat; | |
e114e473 | 3842 | |
6d3dc07c | 3843 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3844 | /* |
6d3dc07c | 3845 | * Looks like a CIPSO packet. |
e114e473 CS |
3846 | * If there are flags but no level netlabel isn't |
3847 | * behaving the way we expect it to. | |
3848 | * | |
f7112e6c | 3849 | * Look it up in the label table |
e114e473 CS |
3850 | * Without guidance regarding the smack value |
3851 | * for the packet fall back on the network | |
3852 | * ambient value. | |
3853 | */ | |
f7112e6c | 3854 | rcu_read_lock(); |
348dc288 | 3855 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3856 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3857 | continue; |
677264e8 CS |
3858 | /* |
3859 | * Compare the catsets. Use the netlbl APIs. | |
3860 | */ | |
3861 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3862 | if ((skp->smk_netlabel.flags & | |
3863 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3864 | found = 1; | |
3865 | break; | |
3866 | } | |
3867 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3868 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3869 | acat + 1); | |
3870 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3871 | skp->smk_netlabel.attr.mls.cat, |
3872 | kcat + 1); | |
3873 | if (acat < 0 || kcat < 0) | |
3874 | break; | |
3875 | } | |
3876 | if (acat == kcat) { | |
3877 | found = 1; | |
3878 | break; | |
3879 | } | |
6d3dc07c | 3880 | } |
f7112e6c CS |
3881 | rcu_read_unlock(); |
3882 | ||
3883 | if (found) | |
2f823ff8 | 3884 | return skp; |
f7112e6c | 3885 | |
54e70ec5 | 3886 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3887 | return &smack_known_web; |
3888 | return &smack_known_star; | |
e114e473 | 3889 | } |
152f91d4 | 3890 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) |
6d3dc07c CS |
3891 | /* |
3892 | * Looks like a fallback, which gives us a secid. | |
3893 | */ | |
152f91d4 | 3894 | return smack_from_secid(sap->attr.secid); |
e114e473 | 3895 | /* |
6d3dc07c CS |
3896 | * Without guidance regarding the smack value |
3897 | * for the packet fall back on the network | |
3898 | * ambient value. | |
e114e473 | 3899 | */ |
272cd7a8 | 3900 | return smack_net_ambient; |
e114e473 CS |
3901 | } |
3902 | ||
69f287ae | 3903 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3904 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3905 | { |
c6739443 CS |
3906 | u8 nexthdr; |
3907 | int offset; | |
3908 | int proto = -EINVAL; | |
3909 | struct ipv6hdr _ipv6h; | |
3910 | struct ipv6hdr *ip6; | |
3911 | __be16 frag_off; | |
3912 | struct tcphdr _tcph, *th; | |
3913 | struct udphdr _udph, *uh; | |
3914 | struct dccp_hdr _dccph, *dh; | |
3915 | ||
3916 | sip->sin6_port = 0; | |
3917 | ||
3918 | offset = skb_network_offset(skb); | |
3919 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3920 | if (ip6 == NULL) | |
3921 | return -EINVAL; | |
3922 | sip->sin6_addr = ip6->saddr; | |
3923 | ||
3924 | nexthdr = ip6->nexthdr; | |
3925 | offset += sizeof(_ipv6h); | |
3926 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3927 | if (offset < 0) | |
3928 | return -EINVAL; | |
3929 | ||
3930 | proto = nexthdr; | |
3931 | switch (proto) { | |
3932 | case IPPROTO_TCP: | |
3933 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3934 | if (th != NULL) | |
3935 | sip->sin6_port = th->source; | |
3936 | break; | |
3937 | case IPPROTO_UDP: | |
3938 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3939 | if (uh != NULL) | |
3940 | sip->sin6_port = uh->source; | |
3941 | break; | |
3942 | case IPPROTO_DCCP: | |
3943 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3944 | if (dh != NULL) | |
3945 | sip->sin6_port = dh->dccph_sport; | |
3946 | break; | |
3947 | } | |
3948 | return proto; | |
3949 | } | |
69f287ae | 3950 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3951 | |
e114e473 CS |
3952 | /** |
3953 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3954 | * @sk: socket | |
3955 | * @skb: packet | |
3956 | * | |
3957 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3958 | */ | |
3959 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3960 | { | |
3961 | struct netlbl_lsm_secattr secattr; | |
3962 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3963 | struct smack_known *skp = NULL; |
c6739443 | 3964 | int rc = 0; |
ecfcc53f | 3965 | struct smk_audit_info ad; |
923e9a13 | 3966 | #ifdef CONFIG_AUDIT |
48c62af6 | 3967 | struct lsm_network_audit net; |
923e9a13 | 3968 | #endif |
69f287ae CS |
3969 | #if IS_ENABLED(CONFIG_IPV6) |
3970 | struct sockaddr_in6 sadd; | |
3971 | int proto; | |
3972 | #endif /* CONFIG_IPV6 */ | |
3973 | ||
c6739443 CS |
3974 | switch (sk->sk_family) { |
3975 | case PF_INET: | |
69f287ae CS |
3976 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3977 | /* | |
3978 | * If there is a secmark use it rather than the CIPSO label. | |
3979 | * If there is no secmark fall back to CIPSO. | |
3980 | * The secmark is assumed to reflect policy better. | |
3981 | */ | |
3982 | if (skb && skb->secmark != 0) { | |
3983 | skp = smack_from_secid(skb->secmark); | |
3984 | goto access_check; | |
3985 | } | |
3986 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3987 | /* |
3988 | * Translate what netlabel gave us. | |
3989 | */ | |
3990 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3991 | |
c6739443 CS |
3992 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3993 | if (rc == 0) | |
2f823ff8 | 3994 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3995 | else |
2f823ff8 | 3996 | skp = smack_net_ambient; |
6d3dc07c | 3997 | |
c6739443 | 3998 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3999 | |
69f287ae CS |
4000 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4001 | access_check: | |
4002 | #endif | |
ecfcc53f | 4003 | #ifdef CONFIG_AUDIT |
c6739443 CS |
4004 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4005 | ad.a.u.net->family = sk->sk_family; | |
4006 | ad.a.u.net->netif = skb->skb_iif; | |
4007 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 4008 | #endif |
c6739443 CS |
4009 | /* |
4010 | * Receiving a packet requires that the other end | |
4011 | * be able to write here. Read access is not required. | |
4012 | * This is the simplist possible security model | |
4013 | * for networking. | |
4014 | */ | |
21c7eae2 LP |
4015 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4016 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 4017 | MAY_WRITE, rc); |
c6739443 | 4018 | if (rc != 0) |
a04e71f6 | 4019 | netlbl_skbuff_err(skb, sk->sk_family, rc, 0); |
c6739443 | 4020 | break; |
69f287ae | 4021 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 4022 | case PF_INET6: |
69f287ae CS |
4023 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
4024 | if (proto != IPPROTO_UDP && proto != IPPROTO_TCP) | |
4025 | break; | |
21abb1ec | 4026 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
4027 | if (skb && skb->secmark != 0) |
4028 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 4029 | else |
21abb1ec CS |
4030 | skp = smack_ipv6host_label(&sadd); |
4031 | if (skp == NULL) | |
69f287ae CS |
4032 | skp = smack_net_ambient; |
4033 | #ifdef CONFIG_AUDIT | |
4034 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
4035 | ad.a.u.net->family = sk->sk_family; | |
4036 | ad.a.u.net->netif = skb->skb_iif; | |
4037 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4038 | #endif /* CONFIG_AUDIT */ | |
4039 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4040 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4041 | MAY_WRITE, rc); | |
21abb1ec CS |
4042 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4043 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4044 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4045 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 4046 | break; |
69f287ae | 4047 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4048 | } |
69f287ae | 4049 | |
a8134296 | 4050 | return rc; |
e114e473 CS |
4051 | } |
4052 | ||
4053 | /** | |
4054 | * smack_socket_getpeersec_stream - pull in packet label | |
4055 | * @sock: the socket | |
4056 | * @optval: user's destination | |
4057 | * @optlen: size thereof | |
251a2a95 | 4058 | * @len: max thereof |
e114e473 CS |
4059 | * |
4060 | * returns zero on success, an error code otherwise | |
4061 | */ | |
4062 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
4063 | char __user *optval, | |
4064 | int __user *optlen, unsigned len) | |
4065 | { | |
4066 | struct socket_smack *ssp; | |
272cd7a8 CS |
4067 | char *rcp = ""; |
4068 | int slen = 1; | |
e114e473 CS |
4069 | int rc = 0; |
4070 | ||
4071 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4072 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4073 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4074 | slen = strlen(rcp) + 1; |
4075 | } | |
e114e473 CS |
4076 | |
4077 | if (slen > len) | |
4078 | rc = -ERANGE; | |
272cd7a8 | 4079 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4080 | rc = -EFAULT; |
4081 | ||
4082 | if (put_user(slen, optlen) != 0) | |
4083 | rc = -EFAULT; | |
4084 | ||
4085 | return rc; | |
4086 | } | |
4087 | ||
4088 | ||
4089 | /** | |
4090 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4091 | * @sock: the peer socket |
e114e473 CS |
4092 | * @skb: packet data |
4093 | * @secid: pointer to where to put the secid of the packet | |
4094 | * | |
4095 | * Sets the netlabel socket state on sk from parent | |
4096 | */ | |
4097 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4098 | struct sk_buff *skb, u32 *secid) | |
4099 | ||
4100 | { | |
4101 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4102 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4103 | struct smack_known *skp; |
b4e0d5f0 CS |
4104 | int family = PF_UNSPEC; |
4105 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4106 | int rc; |
4107 | ||
b4e0d5f0 CS |
4108 | if (skb != NULL) { |
4109 | if (skb->protocol == htons(ETH_P_IP)) | |
4110 | family = PF_INET; | |
69f287ae | 4111 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4112 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4113 | family = PF_INET6; | |
69f287ae | 4114 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4115 | } |
b4e0d5f0 CS |
4116 | if (family == PF_UNSPEC && sock != NULL) |
4117 | family = sock->sk->sk_family; | |
e114e473 | 4118 | |
69f287ae CS |
4119 | switch (family) { |
4120 | case PF_UNIX: | |
272cd7a8 | 4121 | ssp = sock->sk->sk_security; |
2f823ff8 | 4122 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4123 | break; |
4124 | case PF_INET: | |
4125 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4126 | s = skb->secmark; | |
4127 | if (s != 0) | |
4128 | break; | |
4129 | #endif | |
b4e0d5f0 CS |
4130 | /* |
4131 | * Translate what netlabel gave us. | |
4132 | */ | |
272cd7a8 CS |
4133 | if (sock != NULL && sock->sk != NULL) |
4134 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4135 | netlbl_secattr_init(&secattr); |
4136 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4137 | if (rc == 0) { | |
2f823ff8 CS |
4138 | skp = smack_from_secattr(&secattr, ssp); |
4139 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4140 | } |
4141 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4142 | break; |
69f287ae | 4143 | case PF_INET6: |
21abb1ec | 4144 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4145 | s = skb->secmark; |
21abb1ec | 4146 | #endif |
69f287ae | 4147 | break; |
b4e0d5f0 CS |
4148 | } |
4149 | *secid = s; | |
e114e473 CS |
4150 | if (s == 0) |
4151 | return -EINVAL; | |
e114e473 CS |
4152 | return 0; |
4153 | } | |
4154 | ||
4155 | /** | |
07feee8f PM |
4156 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4157 | * @sk: child sock | |
4158 | * @parent: parent socket | |
e114e473 | 4159 | * |
07feee8f PM |
4160 | * Set the smk_{in,out} state of an existing sock based on the process that |
4161 | * is creating the new socket. | |
e114e473 CS |
4162 | */ |
4163 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4164 | { | |
4165 | struct socket_smack *ssp; | |
2f823ff8 | 4166 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4167 | |
07feee8f PM |
4168 | if (sk == NULL || |
4169 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4170 | return; |
4171 | ||
4172 | ssp = sk->sk_security; | |
54e70ec5 | 4173 | ssp->smk_in = skp; |
2f823ff8 | 4174 | ssp->smk_out = skp; |
07feee8f | 4175 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4176 | } |
4177 | ||
4178 | /** | |
4179 | * smack_inet_conn_request - Smack access check on connect | |
4180 | * @sk: socket involved | |
4181 | * @skb: packet | |
4182 | * @req: unused | |
4183 | * | |
4184 | * Returns 0 if a task with the packet label could write to | |
4185 | * the socket, otherwise an error code | |
4186 | */ | |
4187 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4188 | struct request_sock *req) | |
4189 | { | |
07feee8f | 4190 | u16 family = sk->sk_family; |
f7112e6c | 4191 | struct smack_known *skp; |
e114e473 | 4192 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4193 | struct netlbl_lsm_secattr secattr; |
4194 | struct sockaddr_in addr; | |
4195 | struct iphdr *hdr; | |
21c7eae2 | 4196 | struct smack_known *hskp; |
e114e473 | 4197 | int rc; |
ecfcc53f | 4198 | struct smk_audit_info ad; |
923e9a13 | 4199 | #ifdef CONFIG_AUDIT |
48c62af6 | 4200 | struct lsm_network_audit net; |
923e9a13 | 4201 | #endif |
e114e473 | 4202 | |
69f287ae | 4203 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4204 | if (family == PF_INET6) { |
4205 | /* | |
4206 | * Handle mapped IPv4 packets arriving | |
4207 | * via IPv6 sockets. Don't set up netlabel | |
4208 | * processing on IPv6. | |
4209 | */ | |
4210 | if (skb->protocol == htons(ETH_P_IP)) | |
4211 | family = PF_INET; | |
4212 | else | |
4213 | return 0; | |
4214 | } | |
69f287ae | 4215 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4216 | |
7f368ad3 CS |
4217 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4218 | /* | |
4219 | * If there is a secmark use it rather than the CIPSO label. | |
4220 | * If there is no secmark fall back to CIPSO. | |
4221 | * The secmark is assumed to reflect policy better. | |
4222 | */ | |
4223 | if (skb && skb->secmark != 0) { | |
4224 | skp = smack_from_secid(skb->secmark); | |
4225 | goto access_check; | |
4226 | } | |
4227 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4228 | ||
07feee8f PM |
4229 | netlbl_secattr_init(&secattr); |
4230 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4231 | if (rc == 0) |
2f823ff8 | 4232 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4233 | else |
2f823ff8 | 4234 | skp = &smack_known_huh; |
07feee8f PM |
4235 | netlbl_secattr_destroy(&secattr); |
4236 | ||
7f368ad3 CS |
4237 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4238 | access_check: | |
4239 | #endif | |
4240 | ||
ecfcc53f | 4241 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4242 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4243 | ad.a.u.net->family = family; | |
4244 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4245 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4246 | #endif | |
e114e473 | 4247 | /* |
07feee8f PM |
4248 | * Receiving a packet requires that the other end be able to write |
4249 | * here. Read access is not required. | |
e114e473 | 4250 | */ |
21c7eae2 LP |
4251 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4252 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4253 | if (rc != 0) |
4254 | return rc; | |
4255 | ||
4256 | /* | |
4257 | * Save the peer's label in the request_sock so we can later setup | |
4258 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4259 | */ | |
2f823ff8 | 4260 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4261 | |
4262 | /* | |
4263 | * We need to decide if we want to label the incoming connection here | |
4264 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4265 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4266 | */ |
4267 | hdr = ip_hdr(skb); | |
4268 | addr.sin_addr.s_addr = hdr->saddr; | |
4269 | rcu_read_lock(); | |
21abb1ec | 4270 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4271 | rcu_read_unlock(); |
4272 | ||
21c7eae2 | 4273 | if (hskp == NULL) |
f7112e6c | 4274 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4275 | else |
07feee8f | 4276 | netlbl_req_delattr(req); |
e114e473 CS |
4277 | |
4278 | return rc; | |
4279 | } | |
4280 | ||
07feee8f PM |
4281 | /** |
4282 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4283 | * @sk: the new socket | |
4284 | * @req: the connection's request_sock | |
4285 | * | |
4286 | * Transfer the connection's peer label to the newly created socket. | |
4287 | */ | |
4288 | static void smack_inet_csk_clone(struct sock *sk, | |
4289 | const struct request_sock *req) | |
4290 | { | |
4291 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4292 | struct smack_known *skp; |
07feee8f | 4293 | |
2f823ff8 CS |
4294 | if (req->peer_secid != 0) { |
4295 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4296 | ssp->smk_packet = skp; |
2f823ff8 | 4297 | } else |
272cd7a8 | 4298 | ssp->smk_packet = NULL; |
07feee8f PM |
4299 | } |
4300 | ||
e114e473 CS |
4301 | /* |
4302 | * Key management security hooks | |
4303 | * | |
4304 | * Casey has not tested key support very heavily. | |
4305 | * The permission check is most likely too restrictive. | |
4306 | * If you care about keys please have a look. | |
4307 | */ | |
4308 | #ifdef CONFIG_KEYS | |
4309 | ||
4310 | /** | |
4311 | * smack_key_alloc - Set the key security blob | |
4312 | * @key: object | |
d84f4f99 | 4313 | * @cred: the credentials to use |
e114e473 CS |
4314 | * @flags: unused |
4315 | * | |
4316 | * No allocation required | |
4317 | * | |
4318 | * Returns 0 | |
4319 | */ | |
d84f4f99 | 4320 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4321 | unsigned long flags) |
4322 | { | |
2f823ff8 CS |
4323 | struct smack_known *skp = smk_of_task(cred->security); |
4324 | ||
21c7eae2 | 4325 | key->security = skp; |
e114e473 CS |
4326 | return 0; |
4327 | } | |
4328 | ||
4329 | /** | |
4330 | * smack_key_free - Clear the key security blob | |
4331 | * @key: the object | |
4332 | * | |
4333 | * Clear the blob pointer | |
4334 | */ | |
4335 | static void smack_key_free(struct key *key) | |
4336 | { | |
4337 | key->security = NULL; | |
4338 | } | |
4339 | ||
1a28979b | 4340 | /** |
e114e473 CS |
4341 | * smack_key_permission - Smack access on a key |
4342 | * @key_ref: gets to the object | |
d84f4f99 | 4343 | * @cred: the credentials to use |
1a28979b | 4344 | * @perm: requested key permissions |
e114e473 CS |
4345 | * |
4346 | * Return 0 if the task has read and write to the object, | |
4347 | * an error code otherwise | |
4348 | */ | |
4349 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4350 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4351 | { |
4352 | struct key *keyp; | |
ecfcc53f | 4353 | struct smk_audit_info ad; |
2f823ff8 | 4354 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4355 | int request = 0; |
d166c802 | 4356 | int rc; |
e114e473 CS |
4357 | |
4358 | keyp = key_ref_to_ptr(key_ref); | |
4359 | if (keyp == NULL) | |
4360 | return -EINVAL; | |
4361 | /* | |
4362 | * If the key hasn't been initialized give it access so that | |
4363 | * it may do so. | |
4364 | */ | |
4365 | if (keyp->security == NULL) | |
4366 | return 0; | |
4367 | /* | |
4368 | * This should not occur | |
4369 | */ | |
2f823ff8 | 4370 | if (tkp == NULL) |
e114e473 | 4371 | return -EACCES; |
d19dfe58 CS |
4372 | |
4373 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) | |
4374 | return 0; | |
4375 | ||
ecfcc53f EB |
4376 | #ifdef CONFIG_AUDIT |
4377 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4378 | ad.a.u.key_struct.key = keyp->serial; | |
4379 | ad.a.u.key_struct.key_desc = keyp->description; | |
4380 | #endif | |
fffea214 DK |
4381 | if (perm & KEY_NEED_READ) |
4382 | request = MAY_READ; | |
4383 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4384 | request = MAY_WRITE; | |
d166c802 CS |
4385 | rc = smk_access(tkp, keyp->security, request, &ad); |
4386 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4387 | return rc; | |
e114e473 | 4388 | } |
7fc5f36e JB |
4389 | |
4390 | /* | |
4391 | * smack_key_getsecurity - Smack label tagging the key | |
4392 | * @key points to the key to be queried | |
4393 | * @_buffer points to a pointer that should be set to point to the | |
4394 | * resulting string (if no label or an error occurs). | |
4395 | * Return the length of the string (including terminating NUL) or -ve if | |
4396 | * an error. | |
4397 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4398 | */ | |
4399 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4400 | { | |
4401 | struct smack_known *skp = key->security; | |
4402 | size_t length; | |
4403 | char *copy; | |
4404 | ||
4405 | if (key->security == NULL) { | |
4406 | *_buffer = NULL; | |
4407 | return 0; | |
4408 | } | |
4409 | ||
4410 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4411 | if (copy == NULL) | |
4412 | return -ENOMEM; | |
4413 | length = strlen(copy) + 1; | |
4414 | ||
4415 | *_buffer = copy; | |
4416 | return length; | |
4417 | } | |
4418 | ||
e114e473 CS |
4419 | #endif /* CONFIG_KEYS */ |
4420 | ||
d20bdda6 AD |
4421 | /* |
4422 | * Smack Audit hooks | |
4423 | * | |
4424 | * Audit requires a unique representation of each Smack specific | |
4425 | * rule. This unique representation is used to distinguish the | |
4426 | * object to be audited from remaining kernel objects and also | |
4427 | * works as a glue between the audit hooks. | |
4428 | * | |
4429 | * Since repository entries are added but never deleted, we'll use | |
4430 | * the smack_known label address related to the given audit rule as | |
4431 | * the needed unique representation. This also better fits the smack | |
4432 | * model where nearly everything is a label. | |
4433 | */ | |
4434 | #ifdef CONFIG_AUDIT | |
4435 | ||
4436 | /** | |
4437 | * smack_audit_rule_init - Initialize a smack audit rule | |
4438 | * @field: audit rule fields given from user-space (audit.h) | |
4439 | * @op: required testing operator (=, !=, >, <, ...) | |
4440 | * @rulestr: smack label to be audited | |
4441 | * @vrule: pointer to save our own audit rule representation | |
4442 | * | |
4443 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4444 | * The label to be audited is created if necessay. | |
4445 | */ | |
4446 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4447 | { | |
21c7eae2 | 4448 | struct smack_known *skp; |
d20bdda6 AD |
4449 | char **rule = (char **)vrule; |
4450 | *rule = NULL; | |
4451 | ||
4452 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4453 | return -EINVAL; | |
4454 | ||
5af75d8d | 4455 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4456 | return -EINVAL; |
4457 | ||
21c7eae2 | 4458 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4459 | if (IS_ERR(skp)) |
4460 | return PTR_ERR(skp); | |
4461 | ||
4462 | *rule = skp->smk_known; | |
d20bdda6 AD |
4463 | |
4464 | return 0; | |
4465 | } | |
4466 | ||
4467 | /** | |
4468 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4469 | * @krule: rule of interest, in Audit kernel representation format | |
4470 | * | |
4471 | * This is used to filter Smack rules from remaining Audit ones. | |
4472 | * If it's proved that this rule belongs to us, the | |
4473 | * audit_rule_match hook will be called to do the final judgement. | |
4474 | */ | |
4475 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4476 | { | |
4477 | struct audit_field *f; | |
4478 | int i; | |
4479 | ||
4480 | for (i = 0; i < krule->field_count; i++) { | |
4481 | f = &krule->fields[i]; | |
4482 | ||
4483 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4484 | return 1; | |
4485 | } | |
4486 | ||
4487 | return 0; | |
4488 | } | |
4489 | ||
4490 | /** | |
4491 | * smack_audit_rule_match - Audit given object ? | |
4492 | * @secid: security id for identifying the object to test | |
4493 | * @field: audit rule flags given from user-space | |
4494 | * @op: required testing operator | |
4495 | * @vrule: smack internal rule presentation | |
4496 | * @actx: audit context associated with the check | |
4497 | * | |
4498 | * The core Audit hook. It's used to take the decision of | |
4499 | * whether to audit or not to audit a given object. | |
4500 | */ | |
4501 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4502 | struct audit_context *actx) | |
4503 | { | |
2f823ff8 | 4504 | struct smack_known *skp; |
d20bdda6 AD |
4505 | char *rule = vrule; |
4506 | ||
4eb0f4ab RGB |
4507 | if (unlikely(!rule)) { |
4508 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4509 | return -ENOENT; |
4510 | } | |
4511 | ||
4512 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4513 | return 0; | |
4514 | ||
2f823ff8 | 4515 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4516 | |
4517 | /* | |
4518 | * No need to do string comparisons. If a match occurs, | |
4519 | * both pointers will point to the same smack_known | |
4520 | * label. | |
4521 | */ | |
5af75d8d | 4522 | if (op == Audit_equal) |
2f823ff8 | 4523 | return (rule == skp->smk_known); |
5af75d8d | 4524 | if (op == Audit_not_equal) |
2f823ff8 | 4525 | return (rule != skp->smk_known); |
d20bdda6 AD |
4526 | |
4527 | return 0; | |
4528 | } | |
4529 | ||
491a0b08 CS |
4530 | /* |
4531 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4532 | * No memory was allocated. |
4533 | */ | |
d20bdda6 AD |
4534 | |
4535 | #endif /* CONFIG_AUDIT */ | |
4536 | ||
746df9b5 DQ |
4537 | /** |
4538 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4539 | * @name: Full xattr name to check. | |
4540 | */ | |
4541 | static int smack_ismaclabel(const char *name) | |
4542 | { | |
4543 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4544 | } | |
4545 | ||
4546 | ||
251a2a95 | 4547 | /** |
e114e473 CS |
4548 | * smack_secid_to_secctx - return the smack label for a secid |
4549 | * @secid: incoming integer | |
4550 | * @secdata: destination | |
4551 | * @seclen: how long it is | |
4552 | * | |
4553 | * Exists for networking code. | |
4554 | */ | |
4555 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4556 | { | |
2f823ff8 | 4557 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4558 | |
d5630b9d | 4559 | if (secdata) |
2f823ff8 CS |
4560 | *secdata = skp->smk_known; |
4561 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4562 | return 0; |
4563 | } | |
4564 | ||
251a2a95 | 4565 | /** |
4bc87e62 CS |
4566 | * smack_secctx_to_secid - return the secid for a smack label |
4567 | * @secdata: smack label | |
4568 | * @seclen: how long result is | |
4569 | * @secid: outgoing integer | |
4570 | * | |
4571 | * Exists for audit and networking code. | |
4572 | */ | |
e52c1764 | 4573 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4574 | { |
21c7eae2 LP |
4575 | struct smack_known *skp = smk_find_entry(secdata); |
4576 | ||
4577 | if (skp) | |
4578 | *secid = skp->smk_secid; | |
4579 | else | |
4580 | *secid = 0; | |
4bc87e62 CS |
4581 | return 0; |
4582 | } | |
4583 | ||
491a0b08 CS |
4584 | /* |
4585 | * There used to be a smack_release_secctx hook | |
4586 | * that did nothing back when hooks were in a vector. | |
4587 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4588 | */ |
e114e473 | 4589 | |
1ee65e37 DQ |
4590 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4591 | { | |
4592 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4593 | } | |
4594 | ||
4595 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4596 | { | |
4597 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4598 | } | |
4599 | ||
4600 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4601 | { | |
4602 | int len = 0; | |
4603 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4604 | ||
4605 | if (len < 0) | |
4606 | return len; | |
4607 | *ctxlen = len; | |
4608 | return 0; | |
4609 | } | |
4610 | ||
d6d80cb5 CS |
4611 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4612 | { | |
4613 | ||
4614 | struct task_smack *tsp; | |
4615 | struct smack_known *skp; | |
4616 | struct inode_smack *isp; | |
4617 | struct cred *new_creds = *new; | |
4618 | ||
4619 | if (new_creds == NULL) { | |
4620 | new_creds = prepare_creds(); | |
4621 | if (new_creds == NULL) | |
4622 | return -ENOMEM; | |
4623 | } | |
4624 | ||
4625 | tsp = new_creds->security; | |
4626 | ||
4627 | /* | |
4628 | * Get label from overlay inode and set it in create_sid | |
4629 | */ | |
4630 | isp = d_inode(dentry->d_parent)->i_security; | |
4631 | skp = isp->smk_inode; | |
4632 | tsp->smk_task = skp; | |
4633 | *new = new_creds; | |
4634 | return 0; | |
4635 | } | |
4636 | ||
4637 | static int smack_inode_copy_up_xattr(const char *name) | |
4638 | { | |
4639 | /* | |
4640 | * Return 1 if this is the smack access Smack attribute. | |
4641 | */ | |
4642 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4643 | return 1; | |
4644 | ||
4645 | return -EOPNOTSUPP; | |
4646 | } | |
4647 | ||
4648 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4649 | struct qstr *name, | |
4650 | const struct cred *old, | |
4651 | struct cred *new) | |
4652 | { | |
4653 | struct task_smack *otsp = old->security; | |
4654 | struct task_smack *ntsp = new->security; | |
4655 | struct inode_smack *isp; | |
4656 | int may; | |
4657 | ||
4658 | /* | |
4659 | * Use the process credential unless all of | |
4660 | * the transmuting criteria are met | |
4661 | */ | |
4662 | ntsp->smk_task = otsp->smk_task; | |
4663 | ||
4664 | /* | |
4665 | * the attribute of the containing directory | |
4666 | */ | |
4667 | isp = d_inode(dentry->d_parent)->i_security; | |
4668 | ||
4669 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4670 | rcu_read_lock(); | |
4671 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4672 | isp->smk_inode->smk_known, | |
4673 | &otsp->smk_task->smk_rules); | |
4674 | rcu_read_unlock(); | |
4675 | ||
4676 | /* | |
4677 | * If the directory is transmuting and the rule | |
4678 | * providing access is transmuting use the containing | |
4679 | * directory label instead of the process label. | |
4680 | */ | |
4681 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4682 | ntsp->smk_task = isp->smk_inode; | |
4683 | } | |
4684 | return 0; | |
4685 | } | |
4686 | ||
ca97d939 | 4687 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4688 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4689 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4690 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4691 | ||
4692 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4693 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
4694 | LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data), | |
4695 | LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount), | |
4696 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), | |
3bf2789c VT |
4697 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
4698 | LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str), | |
e20b043a CS |
4699 | |
4700 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
e20b043a CS |
4701 | |
4702 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4703 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4704 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4705 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4706 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4707 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4708 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4709 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4710 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4711 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4712 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4713 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4714 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4715 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4716 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4717 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4718 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4719 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4720 | ||
e20b043a CS |
4721 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4722 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4723 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4724 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4725 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4726 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4727 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4728 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4729 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4730 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4731 | ||
4732 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4733 | ||
4734 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4735 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4736 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4737 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
4738 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), | |
4739 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4740 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4741 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4742 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4743 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4744 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4745 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4746 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4747 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4748 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4749 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4750 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4751 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4752 | ||
4753 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4754 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4755 | ||
4756 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4757 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4758 | ||
4759 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_msg_queue_alloc_security), | |
4760 | LSM_HOOK_INIT(msg_queue_free_security, smack_msg_queue_free_security), | |
4761 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), | |
4762 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4763 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4764 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4765 | ||
4766 | LSM_HOOK_INIT(shm_alloc_security, smack_shm_alloc_security), | |
4767 | LSM_HOOK_INIT(shm_free_security, smack_shm_free_security), | |
4768 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), | |
4769 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4770 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4771 | ||
4772 | LSM_HOOK_INIT(sem_alloc_security, smack_sem_alloc_security), | |
4773 | LSM_HOOK_INIT(sem_free_security, smack_sem_free_security), | |
4774 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), | |
4775 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4776 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4777 | ||
4778 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4779 | ||
4780 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4781 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4782 | ||
4783 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4784 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4785 | ||
4786 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
21abb1ec | 4787 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4788 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4789 | #endif |
e20b043a CS |
4790 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4791 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4792 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4793 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4794 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4795 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4796 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4797 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4798 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4799 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4800 | |
e114e473 CS |
4801 | /* key management security hooks */ |
4802 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4803 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4804 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4805 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4806 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4807 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4808 | |
4809 | /* Audit hooks */ | |
4810 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4811 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4812 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4813 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4814 | #endif /* CONFIG_AUDIT */ |
4815 | ||
e20b043a CS |
4816 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4817 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4818 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4819 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4820 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4821 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4822 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4823 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4824 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4825 | }; |
4826 | ||
7198e2ee | 4827 | |
86812bb0 | 4828 | static __init void init_smack_known_list(void) |
7198e2ee | 4829 | { |
86812bb0 CS |
4830 | /* |
4831 | * Initialize rule list locks | |
4832 | */ | |
4833 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4834 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4835 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4836 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4837 | mutex_init(&smack_known_web.smk_rules_lock); |
4838 | /* | |
4839 | * Initialize rule lists | |
4840 | */ | |
4841 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4842 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4843 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4844 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4845 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4846 | /* | |
4847 | * Create the known labels list | |
4848 | */ | |
4d7cf4a1 TS |
4849 | smk_insert_entry(&smack_known_huh); |
4850 | smk_insert_entry(&smack_known_hat); | |
4851 | smk_insert_entry(&smack_known_star); | |
4852 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4853 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4854 | } |
4855 | ||
e114e473 CS |
4856 | /** |
4857 | * smack_init - initialize the smack system | |
4858 | * | |
4859 | * Returns 0 | |
4860 | */ | |
4861 | static __init int smack_init(void) | |
4862 | { | |
d84f4f99 | 4863 | struct cred *cred; |
676dac4b | 4864 | struct task_smack *tsp; |
d84f4f99 | 4865 | |
b1d9e6b0 | 4866 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4867 | return 0; |
4868 | ||
1a5b472b R |
4869 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4870 | if (!smack_inode_cache) | |
4871 | return -ENOMEM; | |
4872 | ||
2f823ff8 CS |
4873 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4874 | GFP_KERNEL); | |
1a5b472b R |
4875 | if (tsp == NULL) { |
4876 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4877 | return -ENOMEM; |
1a5b472b | 4878 | } |
676dac4b | 4879 | |
d21b7b04 JB |
4880 | smack_enabled = 1; |
4881 | ||
21abb1ec CS |
4882 | pr_info("Smack: Initializing.\n"); |
4883 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4884 | pr_info("Smack: Netfilter enabled.\n"); | |
4885 | #endif | |
4886 | #ifdef SMACK_IPV6_PORT_LABELING | |
4887 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4888 | #endif | |
4889 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4890 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4891 | #endif | |
e114e473 CS |
4892 | |
4893 | /* | |
4894 | * Set the security state for the initial task. | |
4895 | */ | |
d84f4f99 | 4896 | cred = (struct cred *) current->cred; |
676dac4b | 4897 | cred->security = tsp; |
e114e473 | 4898 | |
86812bb0 CS |
4899 | /* initialize the smack_known_list */ |
4900 | init_smack_known_list(); | |
e114e473 CS |
4901 | |
4902 | /* | |
4903 | * Register with LSM | |
4904 | */ | |
d69dece5 | 4905 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); |
e114e473 CS |
4906 | |
4907 | return 0; | |
4908 | } | |
4909 | ||
4910 | /* | |
4911 | * Smack requires early initialization in order to label | |
4912 | * all processes and objects when they are created. | |
4913 | */ | |
4914 | security_initcall(smack_init); |