]>
Commit | Line | Data |
---|---|---|
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> |
d66a8acb | 31 | #include <linux/icmpv6.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e114e473 CS |
33 | #include <linux/mutex.h> |
34 | #include <linux/pipe_fs_i.h> | |
e114e473 | 35 | #include <net/cipso_ipv4.h> |
c6739443 CS |
36 | #include <net/ip.h> |
37 | #include <net/ipv6.h> | |
d20bdda6 | 38 | #include <linux/audit.h> |
1fd7317d | 39 | #include <linux/magic.h> |
2a7dba39 | 40 | #include <linux/dcache.h> |
16014d87 | 41 | #include <linux/personality.h> |
40401530 AV |
42 | #include <linux/msg.h> |
43 | #include <linux/shm.h> | |
44 | #include <linux/binfmts.h> | |
3bf2789c | 45 | #include <linux/parser.h> |
e114e473 CS |
46 | #include "smack.h" |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
21abb1ec | 55 | #ifdef SMACK_IPV6_PORT_LABELING |
3c7ce342 | 56 | DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 57 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 58 | #endif |
1a5b472b | 59 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 60 | int smack_enabled; |
c6739443 | 61 | |
3d04c924 | 62 | static const match_table_t smk_mount_tokens = { |
3bf2789c VT |
63 | {Opt_fsdefault, SMK_FSDEFAULT "%s"}, |
64 | {Opt_fsfloor, SMK_FSFLOOR "%s"}, | |
65 | {Opt_fshat, SMK_FSHAT "%s"}, | |
66 | {Opt_fsroot, SMK_FSROOT "%s"}, | |
67 | {Opt_fstransmute, SMK_FSTRANS "%s"}, | |
68 | {Opt_error, NULL}, | |
69 | }; | |
70 | ||
3d04c924 CS |
71 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
72 | static char *smk_bu_mess[] = { | |
73 | "Bringup Error", /* Unused */ | |
74 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
75 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
76 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
77 | }; | |
78 | ||
d166c802 CS |
79 | static void smk_bu_mode(int mode, char *s) |
80 | { | |
81 | int i = 0; | |
82 | ||
83 | if (mode & MAY_READ) | |
84 | s[i++] = 'r'; | |
85 | if (mode & MAY_WRITE) | |
86 | s[i++] = 'w'; | |
87 | if (mode & MAY_EXEC) | |
88 | s[i++] = 'x'; | |
89 | if (mode & MAY_APPEND) | |
90 | s[i++] = 'a'; | |
91 | if (mode & MAY_TRANSMUTE) | |
92 | s[i++] = 't'; | |
93 | if (mode & MAY_LOCK) | |
94 | s[i++] = 'l'; | |
95 | if (i == 0) | |
96 | s[i++] = '-'; | |
97 | s[i] = '\0'; | |
98 | } | |
99 | #endif | |
100 | ||
101 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
102 | static int smk_bu_note(char *note, struct smack_known *sskp, |
103 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
104 | { |
105 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
106 | ||
107 | if (rc <= 0) | |
108 | return rc; | |
bf4b2fee CS |
109 | if (rc > SMACK_UNCONFINED_OBJECT) |
110 | rc = 0; | |
d166c802 CS |
111 | |
112 | smk_bu_mode(mode, acc); | |
bf4b2fee | 113 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 114 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
115 | return 0; |
116 | } | |
117 | #else | |
21c7eae2 | 118 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
119 | #endif |
120 | ||
121 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
122 | static int smk_bu_current(char *note, struct smack_known *oskp, |
123 | int mode, int rc) | |
d166c802 CS |
124 | { |
125 | struct task_smack *tsp = current_security(); | |
126 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
127 | ||
128 | if (rc <= 0) | |
129 | return rc; | |
bf4b2fee CS |
130 | if (rc > SMACK_UNCONFINED_OBJECT) |
131 | rc = 0; | |
d166c802 CS |
132 | |
133 | smk_bu_mode(mode, acc); | |
bf4b2fee | 134 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
135 | tsp->smk_task->smk_known, oskp->smk_known, |
136 | acc, current->comm, note); | |
d166c802 CS |
137 | return 0; |
138 | } | |
139 | #else | |
21c7eae2 | 140 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
141 | #endif |
142 | ||
143 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
144 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
145 | { | |
146 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 147 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
148 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
149 | ||
150 | if (rc <= 0) | |
151 | return rc; | |
bf4b2fee CS |
152 | if (rc > SMACK_UNCONFINED_OBJECT) |
153 | rc = 0; | |
d166c802 CS |
154 | |
155 | smk_bu_mode(mode, acc); | |
bf4b2fee | 156 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 157 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
158 | current->comm, otp->comm); |
159 | return 0; | |
160 | } | |
161 | #else | |
162 | #define smk_bu_task(otp, mode, RC) (RC) | |
163 | #endif | |
164 | ||
165 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
166 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
167 | { | |
168 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 169 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
170 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
171 | ||
bf4b2fee CS |
172 | if (isp->smk_flags & SMK_INODE_IMPURE) |
173 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
174 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
175 | ||
d166c802 CS |
176 | if (rc <= 0) |
177 | return rc; | |
bf4b2fee CS |
178 | if (rc > SMACK_UNCONFINED_OBJECT) |
179 | rc = 0; | |
180 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
181 | (mode & (MAY_WRITE | MAY_APPEND))) | |
182 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
183 | |
184 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
185 | |
186 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
187 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
188 | inode->i_sb->s_id, inode->i_ino, current->comm); |
189 | return 0; | |
190 | } | |
191 | #else | |
192 | #define smk_bu_inode(inode, mode, RC) (RC) | |
193 | #endif | |
194 | ||
195 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
196 | static int smk_bu_file(struct file *file, int mode, int rc) | |
197 | { | |
198 | struct task_smack *tsp = current_security(); | |
199 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 200 | struct inode *inode = file_inode(file); |
bf4b2fee | 201 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
202 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
203 | ||
bf4b2fee CS |
204 | if (isp->smk_flags & SMK_INODE_IMPURE) |
205 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
206 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
207 | ||
d166c802 CS |
208 | if (rc <= 0) |
209 | return rc; | |
bf4b2fee CS |
210 | if (rc > SMACK_UNCONFINED_OBJECT) |
211 | rc = 0; | |
d166c802 CS |
212 | |
213 | smk_bu_mode(mode, acc); | |
bf4b2fee | 214 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 215 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 216 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
217 | current->comm); |
218 | return 0; | |
219 | } | |
220 | #else | |
221 | #define smk_bu_file(file, mode, RC) (RC) | |
222 | #endif | |
223 | ||
224 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
225 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
226 | int mode, int rc) | |
227 | { | |
228 | struct task_smack *tsp = cred->security; | |
229 | struct smack_known *sskp = tsp->smk_task; | |
45063097 | 230 | struct inode *inode = file_inode(file); |
bf4b2fee | 231 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
232 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
233 | ||
bf4b2fee CS |
234 | if (isp->smk_flags & SMK_INODE_IMPURE) |
235 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
236 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
237 | ||
d166c802 CS |
238 | if (rc <= 0) |
239 | return rc; | |
bf4b2fee CS |
240 | if (rc > SMACK_UNCONFINED_OBJECT) |
241 | rc = 0; | |
d166c802 CS |
242 | |
243 | smk_bu_mode(mode, acc); | |
bf4b2fee | 244 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 245 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 246 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
247 | current->comm); |
248 | return 0; | |
249 | } | |
250 | #else | |
251 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
252 | #endif | |
253 | ||
e114e473 CS |
254 | /** |
255 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 256 | * @name: type of the label (attribute) |
e114e473 CS |
257 | * @ip: a pointer to the inode |
258 | * @dp: a pointer to the dentry | |
259 | * | |
e774ad68 LP |
260 | * Returns a pointer to the master list entry for the Smack label, |
261 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 262 | */ |
2f823ff8 CS |
263 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
264 | struct dentry *dp) | |
e114e473 CS |
265 | { |
266 | int rc; | |
f7112e6c | 267 | char *buffer; |
2f823ff8 | 268 | struct smack_known *skp = NULL; |
e114e473 | 269 | |
5d6c3191 | 270 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 271 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 272 | |
f7112e6c CS |
273 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
274 | if (buffer == NULL) | |
e774ad68 | 275 | return ERR_PTR(-ENOMEM); |
e114e473 | 276 | |
5d6c3191 | 277 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
278 | if (rc < 0) |
279 | skp = ERR_PTR(rc); | |
280 | else if (rc == 0) | |
281 | skp = NULL; | |
282 | else | |
2f823ff8 | 283 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
284 | |
285 | kfree(buffer); | |
286 | ||
2f823ff8 | 287 | return skp; |
e114e473 CS |
288 | } |
289 | ||
290 | /** | |
291 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 292 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
293 | * |
294 | * Returns the new blob or NULL if there's no memory available | |
295 | */ | |
1eddfe8e | 296 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
297 | { |
298 | struct inode_smack *isp; | |
299 | ||
1a5b472b | 300 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
301 | if (isp == NULL) |
302 | return NULL; | |
303 | ||
21c7eae2 | 304 | isp->smk_inode = skp; |
e114e473 CS |
305 | isp->smk_flags = 0; |
306 | mutex_init(&isp->smk_lock); | |
307 | ||
308 | return isp; | |
309 | } | |
310 | ||
7898e1f8 CS |
311 | /** |
312 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
313 | * @task: a pointer to the Smack label for the running task |
314 | * @forked: a pointer to the Smack label for the forked task | |
315 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
316 | * |
317 | * Returns the new blob or NULL if there's no memory available | |
318 | */ | |
2f823ff8 CS |
319 | static struct task_smack *new_task_smack(struct smack_known *task, |
320 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
321 | { |
322 | struct task_smack *tsp; | |
323 | ||
324 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
325 | if (tsp == NULL) | |
326 | return NULL; | |
327 | ||
328 | tsp->smk_task = task; | |
329 | tsp->smk_forked = forked; | |
330 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 331 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
332 | mutex_init(&tsp->smk_rules_lock); |
333 | ||
334 | return tsp; | |
335 | } | |
336 | ||
337 | /** | |
338 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
339 | * @nhead: new rules header pointer |
340 | * @ohead: old rules header pointer | |
341 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
342 | * |
343 | * Returns 0 on success, -ENOMEM on error | |
344 | */ | |
345 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
346 | gfp_t gfp) | |
347 | { | |
348 | struct smack_rule *nrp; | |
349 | struct smack_rule *orp; | |
350 | int rc = 0; | |
351 | ||
7898e1f8 CS |
352 | list_for_each_entry_rcu(orp, ohead, list) { |
353 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
354 | if (nrp == NULL) { | |
355 | rc = -ENOMEM; | |
356 | break; | |
357 | } | |
358 | *nrp = *orp; | |
359 | list_add_rcu(&nrp->list, nhead); | |
360 | } | |
361 | return rc; | |
362 | } | |
363 | ||
38416e53 ZJ |
364 | /** |
365 | * smk_copy_relabel - copy smk_relabel labels list | |
366 | * @nhead: new rules header pointer | |
367 | * @ohead: old rules header pointer | |
368 | * @gfp: type of the memory for the allocation | |
369 | * | |
370 | * Returns 0 on success, -ENOMEM on error | |
371 | */ | |
372 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
373 | gfp_t gfp) | |
374 | { | |
375 | struct smack_known_list_elem *nklep; | |
376 | struct smack_known_list_elem *oklep; | |
377 | ||
38416e53 ZJ |
378 | list_for_each_entry(oklep, ohead, list) { |
379 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
380 | if (nklep == NULL) { | |
381 | smk_destroy_label_list(nhead); | |
382 | return -ENOMEM; | |
383 | } | |
384 | nklep->smk_label = oklep->smk_label; | |
385 | list_add(&nklep->list, nhead); | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
5663884c LP |
391 | /** |
392 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
393 | * @mode - input mode in form of PTRACE_MODE_* | |
394 | * | |
395 | * Returns a converted MAY_* mode usable by smack rules | |
396 | */ | |
397 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
398 | { | |
3dfb7d8c | 399 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 400 | return MAY_READWRITE; |
3dfb7d8c JH |
401 | if (mode & PTRACE_MODE_READ) |
402 | return MAY_READ; | |
5663884c LP |
403 | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /** | |
408 | * smk_ptrace_rule_check - helper for ptrace access | |
409 | * @tracer: tracer process | |
21c7eae2 | 410 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
411 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
412 | * @func: name of the function that called us, used for audit | |
413 | * | |
414 | * Returns 0 on access granted, -error on error | |
415 | */ | |
21c7eae2 LP |
416 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
417 | struct smack_known *tracee_known, | |
5663884c LP |
418 | unsigned int mode, const char *func) |
419 | { | |
420 | int rc; | |
421 | struct smk_audit_info ad, *saip = NULL; | |
422 | struct task_smack *tsp; | |
21c7eae2 | 423 | struct smack_known *tracer_known; |
dcb569cf | 424 | const struct cred *tracercred; |
5663884c LP |
425 | |
426 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
427 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
428 | smk_ad_setfield_u_tsk(&ad, tracer); | |
429 | saip = &ad; | |
430 | } | |
431 | ||
6d1cff2a | 432 | rcu_read_lock(); |
dcb569cf CS |
433 | tracercred = __task_cred(tracer); |
434 | tsp = tracercred->security; | |
21c7eae2 | 435 | tracer_known = smk_of_task(tsp); |
5663884c | 436 | |
66867818 LP |
437 | if ((mode & PTRACE_MODE_ATTACH) && |
438 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
439 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 440 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
441 | rc = 0; |
442 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
443 | rc = -EACCES; | |
dcb569cf | 444 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
445 | rc = 0; |
446 | else | |
447 | rc = -EACCES; | |
448 | ||
449 | if (saip) | |
21c7eae2 LP |
450 | smack_log(tracer_known->smk_known, |
451 | tracee_known->smk_known, | |
452 | 0, rc, saip); | |
66867818 | 453 | |
6d1cff2a | 454 | rcu_read_unlock(); |
66867818 LP |
455 | return rc; |
456 | } | |
457 | ||
458 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 459 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
460 | |
461 | rcu_read_unlock(); | |
5663884c LP |
462 | return rc; |
463 | } | |
464 | ||
e114e473 CS |
465 | /* |
466 | * LSM hooks. | |
467 | * We he, that is fun! | |
468 | */ | |
469 | ||
470 | /** | |
9e48858f | 471 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 472 | * @ctp: child task pointer |
5663884c | 473 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
474 | * |
475 | * Returns 0 if access is OK, an error code otherwise | |
476 | * | |
5663884c | 477 | * Do the capability checks. |
e114e473 | 478 | */ |
9e48858f | 479 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 480 | { |
2f823ff8 | 481 | struct smack_known *skp; |
e114e473 | 482 | |
6d1cff2a | 483 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 484 | |
b1d9e6b0 | 485 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
486 | } |
487 | ||
488 | /** | |
489 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
490 | * @ptp: parent task pointer | |
491 | * | |
492 | * Returns 0 if access is OK, an error code otherwise | |
493 | * | |
5663884c | 494 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
495 | */ |
496 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
497 | { | |
498 | int rc; | |
2f823ff8 | 499 | struct smack_known *skp; |
5cd9c58f | 500 | |
959e6c7f | 501 | skp = smk_of_task(current_security()); |
ecfcc53f | 502 | |
21c7eae2 | 503 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
504 | return rc; |
505 | } | |
506 | ||
507 | /** | |
508 | * smack_syslog - Smack approval on syslog | |
509 | * @type: message type | |
510 | * | |
e114e473 CS |
511 | * Returns 0 on success, error code otherwise. |
512 | */ | |
12b3052c | 513 | static int smack_syslog(int typefrom_file) |
e114e473 | 514 | { |
12b3052c | 515 | int rc = 0; |
2f823ff8 | 516 | struct smack_known *skp = smk_of_current(); |
e114e473 | 517 | |
1880eff7 | 518 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
519 | return 0; |
520 | ||
24ea1b6e | 521 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
522 | rc = -EACCES; |
523 | ||
524 | return rc; | |
525 | } | |
526 | ||
527 | ||
528 | /* | |
529 | * Superblock Hooks. | |
530 | */ | |
531 | ||
532 | /** | |
533 | * smack_sb_alloc_security - allocate a superblock blob | |
534 | * @sb: the superblock getting the blob | |
535 | * | |
536 | * Returns 0 on success or -ENOMEM on error. | |
537 | */ | |
538 | static int smack_sb_alloc_security(struct super_block *sb) | |
539 | { | |
540 | struct superblock_smack *sbsp; | |
541 | ||
542 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
543 | ||
544 | if (sbsp == NULL) | |
545 | return -ENOMEM; | |
546 | ||
21c7eae2 LP |
547 | sbsp->smk_root = &smack_known_floor; |
548 | sbsp->smk_default = &smack_known_floor; | |
549 | sbsp->smk_floor = &smack_known_floor; | |
550 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 551 | /* |
9f50eda2 | 552 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 553 | */ |
e114e473 CS |
554 | sb->s_security = sbsp; |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | /** | |
560 | * smack_sb_free_security - free a superblock blob | |
561 | * @sb: the superblock getting the blob | |
562 | * | |
563 | */ | |
564 | static void smack_sb_free_security(struct super_block *sb) | |
565 | { | |
566 | kfree(sb->s_security); | |
567 | sb->s_security = NULL; | |
568 | } | |
569 | ||
12085b14 AV |
570 | struct smack_mnt_opts { |
571 | const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute; | |
572 | }; | |
573 | ||
204cc0cc AV |
574 | static void smack_free_mnt_opts(void *mnt_opts) |
575 | { | |
12085b14 AV |
576 | struct smack_mnt_opts *opts = mnt_opts; |
577 | kfree(opts->fsdefault); | |
578 | kfree(opts->fsfloor); | |
579 | kfree(opts->fshat); | |
580 | kfree(opts->fsroot); | |
581 | kfree(opts->fstransmute); | |
204cc0cc AV |
582 | kfree(opts); |
583 | } | |
584 | ||
e114e473 CS |
585 | /** |
586 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 587 | * @orig: where to start |
251a2a95 | 588 | * @smackopts: mount options string |
e114e473 CS |
589 | * |
590 | * Returns 0 on success or -ENOMEM on error. | |
591 | * | |
592 | * Copy the Smack specific mount options out of the mount | |
593 | * options list. | |
594 | */ | |
e0007529 | 595 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
596 | { |
597 | char *cp, *commap, *otheropts, *dp; | |
598 | ||
e114e473 CS |
599 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
600 | if (otheropts == NULL) | |
601 | return -ENOMEM; | |
602 | ||
603 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
604 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
605 | dp = smackopts; | |
606 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
607 | dp = smackopts; | |
608 | else if (strstr(cp, SMK_FSHAT) == cp) | |
609 | dp = smackopts; | |
610 | else if (strstr(cp, SMK_FSROOT) == cp) | |
611 | dp = smackopts; | |
e830b394 CS |
612 | else if (strstr(cp, SMK_FSTRANS) == cp) |
613 | dp = smackopts; | |
e114e473 CS |
614 | else |
615 | dp = otheropts; | |
616 | ||
617 | commap = strchr(cp, ','); | |
618 | if (commap != NULL) | |
619 | *commap = '\0'; | |
620 | ||
621 | if (*dp != '\0') | |
622 | strcat(dp, ","); | |
623 | strcat(dp, cp); | |
624 | } | |
625 | ||
626 | strcpy(orig, otheropts); | |
627 | free_page((unsigned long)otheropts); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
55c0e5bd AV |
632 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
633 | { | |
634 | struct smack_mnt_opts *opts = *mnt_opts; | |
635 | ||
636 | if (!opts) { | |
637 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
638 | if (!opts) | |
639 | return -ENOMEM; | |
640 | *mnt_opts = opts; | |
641 | } | |
642 | ||
643 | if (!s) | |
644 | return -ENOMEM; | |
645 | ||
646 | switch (token) { | |
647 | case Opt_fsdefault: | |
648 | if (opts->fsdefault) | |
649 | goto out_opt_err; | |
650 | opts->fsdefault = s; | |
651 | break; | |
652 | case Opt_fsfloor: | |
653 | if (opts->fsfloor) | |
654 | goto out_opt_err; | |
655 | opts->fsfloor = s; | |
656 | break; | |
657 | case Opt_fshat: | |
658 | if (opts->fshat) | |
659 | goto out_opt_err; | |
660 | opts->fshat = s; | |
661 | break; | |
662 | case Opt_fsroot: | |
663 | if (opts->fsroot) | |
664 | goto out_opt_err; | |
665 | opts->fsroot = s; | |
666 | break; | |
667 | case Opt_fstransmute: | |
668 | if (opts->fstransmute) | |
669 | goto out_opt_err; | |
670 | opts->fstransmute = s; | |
671 | break; | |
672 | } | |
673 | return 0; | |
674 | ||
675 | out_opt_err: | |
676 | pr_warn("Smack: duplicate mount options\n"); | |
677 | return -EINVAL; | |
678 | } | |
679 | ||
e114e473 | 680 | /** |
3bf2789c VT |
681 | * smack_parse_opts_str - parse Smack specific mount options |
682 | * @options: mount options string | |
683 | * @opts: where to store converted mount opts | |
684 | * | |
685 | * Returns 0 on success or -ENOMEM on error. | |
686 | * | |
687 | * converts Smack specific mount options to generic security option format | |
688 | */ | |
689 | static int smack_parse_opts_str(char *options, | |
204cc0cc | 690 | void **mnt_opts) |
3bf2789c VT |
691 | { |
692 | char *p; | |
3d04c924 | 693 | int rc = -ENOMEM; |
3d04c924 | 694 | int token; |
3bf2789c | 695 | |
3bf2789c VT |
696 | if (!options) |
697 | return 0; | |
698 | ||
699 | while ((p = strsep(&options, ",")) != NULL) { | |
3bf2789c | 700 | substring_t args[MAX_OPT_ARGS]; |
55c0e5bd | 701 | const char *arg; |
3bf2789c VT |
702 | |
703 | if (!*p) | |
704 | continue; | |
705 | ||
3d04c924 | 706 | token = match_token(p, smk_mount_tokens, args); |
3bf2789c | 707 | |
55c0e5bd AV |
708 | arg = match_strdup(&args[0]); |
709 | rc = smack_add_opt(token, arg, mnt_opts); | |
710 | if (unlikely(rc)) { | |
711 | kfree(arg); | |
712 | if (*mnt_opts) | |
713 | smack_free_mnt_opts(*mnt_opts); | |
714 | *mnt_opts = NULL; | |
715 | return rc; | |
3bf2789c VT |
716 | } |
717 | } | |
3bf2789c | 718 | return 0; |
3bf2789c VT |
719 | } |
720 | ||
204cc0cc | 721 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
5b400239 AV |
722 | { |
723 | char *s = (char *)get_zeroed_page(GFP_KERNEL); | |
724 | int err; | |
725 | ||
726 | if (!s) | |
727 | return -ENOMEM; | |
728 | err = smack_sb_copy_data(options, s); | |
729 | if (!err) | |
204cc0cc | 730 | err = smack_parse_opts_str(s, mnt_opts); |
5b400239 AV |
731 | free_page((unsigned long)s); |
732 | return err; | |
733 | } | |
734 | ||
3bf2789c VT |
735 | /** |
736 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 737 | * @sb: the file system superblock |
3bf2789c VT |
738 | * @opts: Smack mount options |
739 | * @kern_flags: mount option from kernel space or user space | |
740 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
741 | * |
742 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
743 | * |
744 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
745 | * labels. | |
e114e473 | 746 | */ |
3bf2789c | 747 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 748 | void *mnt_opts, |
3bf2789c VT |
749 | unsigned long kern_flags, |
750 | unsigned long *set_kern_flags) | |
e114e473 CS |
751 | { |
752 | struct dentry *root = sb->s_root; | |
c6f493d6 | 753 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
754 | struct superblock_smack *sp = sb->s_security; |
755 | struct inode_smack *isp; | |
24ea1b6e | 756 | struct smack_known *skp; |
12085b14 AV |
757 | struct smack_mnt_opts *opts = mnt_opts; |
758 | bool transmute = false; | |
e114e473 | 759 | |
9f50eda2 | 760 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 761 | return 0; |
eb982cb4 | 762 | |
2097f599 HS |
763 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
764 | /* | |
765 | * Unprivileged mounts don't get to specify Smack values. | |
766 | */ | |
12085b14 | 767 | if (opts) |
2097f599 HS |
768 | return -EPERM; |
769 | /* | |
770 | * Unprivileged mounts get root and default from the caller. | |
771 | */ | |
772 | skp = smk_of_current(); | |
773 | sp->smk_root = skp; | |
774 | sp->smk_default = skp; | |
775 | /* | |
776 | * For a handful of fs types with no user-controlled | |
777 | * backing store it's okay to trust security labels | |
778 | * in the filesystem. The rest are untrusted. | |
779 | */ | |
780 | if (sb->s_user_ns != &init_user_ns && | |
781 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
782 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 783 | transmute = true; |
2097f599 HS |
784 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
785 | } | |
786 | } | |
787 | ||
9f50eda2 | 788 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 789 | |
12085b14 AV |
790 | if (opts) { |
791 | if (opts->fsdefault) { | |
792 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
793 | if (IS_ERR(skp)) |
794 | return PTR_ERR(skp); | |
3bf2789c | 795 | sp->smk_default = skp; |
12085b14 AV |
796 | } |
797 | if (opts->fsfloor) { | |
798 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
799 | if (IS_ERR(skp)) |
800 | return PTR_ERR(skp); | |
801 | sp->smk_floor = skp; | |
12085b14 AV |
802 | } |
803 | if (opts->fshat) { | |
804 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
805 | if (IS_ERR(skp)) |
806 | return PTR_ERR(skp); | |
3bf2789c | 807 | sp->smk_hat = skp; |
12085b14 AV |
808 | } |
809 | if (opts->fsroot) { | |
810 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
811 | if (IS_ERR(skp)) |
812 | return PTR_ERR(skp); | |
813 | sp->smk_root = skp; | |
12085b14 AV |
814 | } |
815 | if (opts->fstransmute) { | |
816 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
817 | if (IS_ERR(skp)) |
818 | return PTR_ERR(skp); | |
819 | sp->smk_root = skp; | |
12085b14 | 820 | transmute = true; |
e114e473 CS |
821 | } |
822 | } | |
823 | ||
824 | /* | |
825 | * Initialize the root inode. | |
826 | */ | |
827 | isp = inode->i_security; | |
55dfc5da JB |
828 | if (isp == NULL) { |
829 | isp = new_inode_smack(sp->smk_root); | |
830 | if (isp == NULL) | |
831 | return -ENOMEM; | |
832 | inode->i_security = isp; | |
e830b394 | 833 | } else |
e114e473 CS |
834 | isp->smk_inode = sp->smk_root; |
835 | ||
e830b394 CS |
836 | if (transmute) |
837 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
838 | ||
e114e473 CS |
839 | return 0; |
840 | } | |
841 | ||
842 | /** | |
843 | * smack_sb_statfs - Smack check on statfs | |
844 | * @dentry: identifies the file system in question | |
845 | * | |
846 | * Returns 0 if current can read the floor of the filesystem, | |
847 | * and error code otherwise | |
848 | */ | |
849 | static int smack_sb_statfs(struct dentry *dentry) | |
850 | { | |
851 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
852 | int rc; |
853 | struct smk_audit_info ad; | |
854 | ||
a269434d | 855 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 856 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 857 | |
ecfcc53f | 858 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 859 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 860 | return rc; |
e114e473 CS |
861 | } |
862 | ||
676dac4b CS |
863 | /* |
864 | * BPRM hooks | |
865 | */ | |
866 | ||
ce8a4321 CS |
867 | /** |
868 | * smack_bprm_set_creds - set creds for exec | |
869 | * @bprm: the exec information | |
870 | * | |
5663884c | 871 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 872 | */ |
676dac4b CS |
873 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
874 | { | |
496ad9aa | 875 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 876 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 877 | struct inode_smack *isp; |
809c02e0 | 878 | struct superblock_smack *sbsp; |
676dac4b CS |
879 | int rc; |
880 | ||
ddb4a144 | 881 | if (bprm->called_set_creds) |
676dac4b CS |
882 | return 0; |
883 | ||
84088ba2 JS |
884 | isp = inode->i_security; |
885 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
886 | return 0; |
887 | ||
809c02e0 SF |
888 | sbsp = inode->i_sb->s_security; |
889 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && | |
890 | isp->smk_task != sbsp->smk_root) | |
891 | return 0; | |
892 | ||
9227dd2a | 893 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
894 | struct task_struct *tracer; |
895 | rc = 0; | |
896 | ||
897 | rcu_read_lock(); | |
898 | tracer = ptrace_parent(current); | |
899 | if (likely(tracer != NULL)) | |
900 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 901 | isp->smk_task, |
5663884c LP |
902 | PTRACE_MODE_ATTACH, |
903 | __func__); | |
904 | rcu_read_unlock(); | |
905 | ||
906 | if (rc != 0) | |
907 | return rc; | |
908 | } else if (bprm->unsafe) | |
84088ba2 | 909 | return -EPERM; |
676dac4b | 910 | |
84088ba2 JS |
911 | bsp->smk_task = isp->smk_task; |
912 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 913 | |
ccbb6e10 KC |
914 | /* Decide if this is a secure exec. */ |
915 | if (bsp->smk_task != bsp->smk_forked) | |
916 | bprm->secureexec = 1; | |
917 | ||
84088ba2 JS |
918 | return 0; |
919 | } | |
676dac4b | 920 | |
e114e473 CS |
921 | /* |
922 | * Inode hooks | |
923 | */ | |
924 | ||
925 | /** | |
926 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 927 | * @inode: the inode in need of a blob |
e114e473 CS |
928 | * |
929 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
930 | */ | |
931 | static int smack_inode_alloc_security(struct inode *inode) | |
932 | { | |
2f823ff8 CS |
933 | struct smack_known *skp = smk_of_current(); |
934 | ||
21c7eae2 | 935 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
936 | if (inode->i_security == NULL) |
937 | return -ENOMEM; | |
938 | return 0; | |
939 | } | |
940 | ||
941 | /** | |
3d4f673a HS |
942 | * smack_inode_free_rcu - Free inode_smack blob from cache |
943 | * @head: the rcu_head for getting inode_smack pointer | |
944 | * | |
945 | * Call back function called from call_rcu() to free | |
946 | * the i_security blob pointer in inode | |
947 | */ | |
948 | static void smack_inode_free_rcu(struct rcu_head *head) | |
949 | { | |
950 | struct inode_smack *issp; | |
951 | ||
952 | issp = container_of(head, struct inode_smack, smk_rcu); | |
953 | kmem_cache_free(smack_inode_cache, issp); | |
954 | } | |
955 | ||
956 | /** | |
957 | * smack_inode_free_security - free an inode blob using call_rcu() | |
251a2a95 | 958 | * @inode: the inode with a blob |
e114e473 | 959 | * |
3d4f673a | 960 | * Clears the blob pointer in inode using RCU |
e114e473 CS |
961 | */ |
962 | static void smack_inode_free_security(struct inode *inode) | |
963 | { | |
3d4f673a HS |
964 | struct inode_smack *issp = inode->i_security; |
965 | ||
966 | /* | |
967 | * The inode may still be referenced in a path walk and | |
968 | * a call to smack_inode_permission() can be made | |
969 | * after smack_inode_free_security() is called. | |
970 | * To avoid race condition free the i_security via RCU | |
971 | * and leave the current inode->i_security pointer intact. | |
972 | * The inode will be freed after the RCU grace period too. | |
973 | */ | |
974 | call_rcu(&issp->smk_rcu, smack_inode_free_rcu); | |
e114e473 CS |
975 | } |
976 | ||
977 | /** | |
978 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
979 | * @inode: the newly created inode |
980 | * @dir: containing directory object | |
2a7dba39 | 981 | * @qstr: unused |
e114e473 CS |
982 | * @name: where to put the attribute name |
983 | * @value: where to put the attribute value | |
984 | * @len: where to put the length of the attribute | |
985 | * | |
986 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
987 | */ | |
988 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 989 | const struct qstr *qstr, const char **name, |
2a7dba39 | 990 | void **value, size_t *len) |
e114e473 | 991 | { |
2267b13a | 992 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 993 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
994 | struct smack_known *isp = smk_of_inode(inode); |
995 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 996 | int may; |
e114e473 | 997 | |
9548906b TH |
998 | if (name) |
999 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1000 | |
68390ccf | 1001 | if (value && len) { |
7898e1f8 | 1002 | rcu_read_lock(); |
21c7eae2 LP |
1003 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1004 | &skp->smk_rules); | |
7898e1f8 | 1005 | rcu_read_unlock(); |
5c6d1125 JS |
1006 | |
1007 | /* | |
1008 | * If the access rule allows transmutation and | |
1009 | * the directory requests transmutation then | |
1010 | * by all means transmute. | |
2267b13a | 1011 | * Mark the inode as changed. |
5c6d1125 | 1012 | */ |
7898e1f8 | 1013 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1014 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1015 | isp = dsp; |
2267b13a CS |
1016 | issp->smk_flags |= SMK_INODE_CHANGED; |
1017 | } | |
5c6d1125 | 1018 | |
21c7eae2 | 1019 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1020 | if (*value == NULL) |
1021 | return -ENOMEM; | |
e114e473 | 1022 | |
21c7eae2 | 1023 | *len = strlen(isp->smk_known); |
68390ccf | 1024 | } |
e114e473 CS |
1025 | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * smack_inode_link - Smack check on link | |
1031 | * @old_dentry: the existing object | |
1032 | * @dir: unused | |
1033 | * @new_dentry: the new object | |
1034 | * | |
1035 | * Returns 0 if access is permitted, an error code otherwise | |
1036 | */ | |
1037 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1038 | struct dentry *new_dentry) | |
1039 | { | |
21c7eae2 | 1040 | struct smack_known *isp; |
ecfcc53f EB |
1041 | struct smk_audit_info ad; |
1042 | int rc; | |
1043 | ||
a269434d | 1044 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1045 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1046 | |
c6f493d6 | 1047 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1048 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1049 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1050 | |
8802565b | 1051 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1052 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1053 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1054 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1055 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1056 | } |
1057 | ||
1058 | return rc; | |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * smack_inode_unlink - Smack check on inode deletion | |
1063 | * @dir: containing directory object | |
1064 | * @dentry: file to unlink | |
1065 | * | |
1066 | * Returns 0 if current can write the containing directory | |
1067 | * and the object, error code otherwise | |
1068 | */ | |
1069 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1070 | { | |
c6f493d6 | 1071 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1072 | struct smk_audit_info ad; |
e114e473 CS |
1073 | int rc; |
1074 | ||
a269434d | 1075 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1076 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1077 | ||
e114e473 CS |
1078 | /* |
1079 | * You need write access to the thing you're unlinking | |
1080 | */ | |
ecfcc53f | 1081 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1082 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1083 | if (rc == 0) { |
e114e473 CS |
1084 | /* |
1085 | * You also need write access to the containing directory | |
1086 | */ | |
cdb56b60 | 1087 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1088 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1089 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1090 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1091 | } |
e114e473 CS |
1092 | return rc; |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * smack_inode_rmdir - Smack check on directory deletion | |
1097 | * @dir: containing directory object | |
1098 | * @dentry: directory to unlink | |
1099 | * | |
1100 | * Returns 0 if current can write the containing directory | |
1101 | * and the directory, error code otherwise | |
1102 | */ | |
1103 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1104 | { | |
ecfcc53f | 1105 | struct smk_audit_info ad; |
e114e473 CS |
1106 | int rc; |
1107 | ||
a269434d | 1108 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1109 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1110 | ||
e114e473 CS |
1111 | /* |
1112 | * You need write access to the thing you're removing | |
1113 | */ | |
c6f493d6 DH |
1114 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1115 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1116 | if (rc == 0) { |
e114e473 CS |
1117 | /* |
1118 | * You also need write access to the containing directory | |
1119 | */ | |
cdb56b60 | 1120 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1121 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1122 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1123 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1124 | } |
e114e473 CS |
1125 | |
1126 | return rc; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1131 | * @old_inode: unused |
1132 | * @old_dentry: the old object | |
1133 | * @new_inode: unused | |
1134 | * @new_dentry: the new object | |
e114e473 CS |
1135 | * |
1136 | * Read and write access is required on both the old and | |
1137 | * new directories. | |
1138 | * | |
1139 | * Returns 0 if access is permitted, an error code otherwise | |
1140 | */ | |
1141 | static int smack_inode_rename(struct inode *old_inode, | |
1142 | struct dentry *old_dentry, | |
1143 | struct inode *new_inode, | |
1144 | struct dentry *new_dentry) | |
1145 | { | |
1146 | int rc; | |
21c7eae2 | 1147 | struct smack_known *isp; |
ecfcc53f EB |
1148 | struct smk_audit_info ad; |
1149 | ||
a269434d | 1150 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1151 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1152 | |
c6f493d6 | 1153 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1154 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1155 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1156 | |
8802565b | 1157 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1158 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1159 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1160 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1161 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1162 | } |
e114e473 CS |
1163 | return rc; |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * smack_inode_permission - Smack version of permission() | |
1168 | * @inode: the inode in question | |
1169 | * @mask: the access requested | |
e114e473 CS |
1170 | * |
1171 | * This is the important Smack hook. | |
1172 | * | |
1173 | * Returns 0 if access is permitted, -EACCES otherwise | |
1174 | */ | |
e74f71eb | 1175 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1176 | { |
9f50eda2 | 1177 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1178 | struct smk_audit_info ad; |
e74f71eb | 1179 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1180 | int rc; |
d09ca739 EP |
1181 | |
1182 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1183 | /* |
1184 | * No permission to check. Existence test. Yup, it's there. | |
1185 | */ | |
1186 | if (mask == 0) | |
1187 | return 0; | |
8c9e80ed | 1188 | |
9f50eda2 SF |
1189 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1190 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1191 | return -EACCES; | |
1192 | } | |
1193 | ||
8c9e80ed | 1194 | /* May be droppable after audit */ |
e74f71eb | 1195 | if (no_block) |
8c9e80ed | 1196 | return -ECHILD; |
f48b7399 | 1197 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1198 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1199 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1200 | rc = smk_bu_inode(inode, mask, rc); | |
1201 | return rc; | |
e114e473 CS |
1202 | } |
1203 | ||
1204 | /** | |
1205 | * smack_inode_setattr - Smack check for setting attributes | |
1206 | * @dentry: the object | |
1207 | * @iattr: for the force flag | |
1208 | * | |
1209 | * Returns 0 if access is permitted, an error code otherwise | |
1210 | */ | |
1211 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1212 | { | |
ecfcc53f | 1213 | struct smk_audit_info ad; |
d166c802 CS |
1214 | int rc; |
1215 | ||
e114e473 CS |
1216 | /* |
1217 | * Need to allow for clearing the setuid bit. | |
1218 | */ | |
1219 | if (iattr->ia_valid & ATTR_FORCE) | |
1220 | return 0; | |
a269434d | 1221 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1222 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1223 | |
c6f493d6 DH |
1224 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1225 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1226 | return rc; |
e114e473 CS |
1227 | } |
1228 | ||
1229 | /** | |
1230 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1231 | * @mnt: vfsmount of the object |
e114e473 CS |
1232 | * @dentry: the object |
1233 | * | |
1234 | * Returns 0 if access is permitted, an error code otherwise | |
1235 | */ | |
3f7036a0 | 1236 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1237 | { |
ecfcc53f | 1238 | struct smk_audit_info ad; |
c6f493d6 | 1239 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1240 | int rc; |
ecfcc53f | 1241 | |
f48b7399 | 1242 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1243 | smk_ad_setfield_u_fs_path(&ad, *path); |
1244 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1245 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1246 | return rc; |
e114e473 CS |
1247 | } |
1248 | ||
1249 | /** | |
1250 | * smack_inode_setxattr - Smack check for setting xattrs | |
1251 | * @dentry: the object | |
1252 | * @name: name of the attribute | |
e95ef49b LP |
1253 | * @value: value of the attribute |
1254 | * @size: size of the value | |
e114e473 CS |
1255 | * @flags: unused |
1256 | * | |
1257 | * This protects the Smack attribute explicitly. | |
1258 | * | |
1259 | * Returns 0 if access is permitted, an error code otherwise | |
1260 | */ | |
8f0cfa52 DH |
1261 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1262 | const void *value, size_t size, int flags) | |
e114e473 | 1263 | { |
ecfcc53f | 1264 | struct smk_audit_info ad; |
19760ad0 CS |
1265 | struct smack_known *skp; |
1266 | int check_priv = 0; | |
1267 | int check_import = 0; | |
1268 | int check_star = 0; | |
bcdca225 | 1269 | int rc = 0; |
e114e473 | 1270 | |
19760ad0 CS |
1271 | /* |
1272 | * Check label validity here so import won't fail in post_setxattr | |
1273 | */ | |
bcdca225 CS |
1274 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1275 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1276 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1277 | check_priv = 1; | |
1278 | check_import = 1; | |
1279 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1280 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1281 | check_priv = 1; | |
1282 | check_import = 1; | |
1283 | check_star = 1; | |
5c6d1125 | 1284 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1285 | check_priv = 1; |
5c6d1125 JS |
1286 | if (size != TRANS_TRUE_SIZE || |
1287 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1288 | rc = -EINVAL; | |
bcdca225 CS |
1289 | } else |
1290 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1291 | ||
19760ad0 CS |
1292 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1293 | rc = -EPERM; | |
1294 | ||
1295 | if (rc == 0 && check_import) { | |
b862e561 | 1296 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1297 | if (IS_ERR(skp)) |
1298 | rc = PTR_ERR(skp); | |
1299 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1300 | (skp == &smack_known_star || skp == &smack_known_web))) |
1301 | rc = -EINVAL; | |
1302 | } | |
1303 | ||
a269434d | 1304 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1305 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1306 | ||
d166c802 | 1307 | if (rc == 0) { |
c6f493d6 DH |
1308 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1309 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1310 | } |
bcdca225 CS |
1311 | |
1312 | return rc; | |
e114e473 CS |
1313 | } |
1314 | ||
1315 | /** | |
1316 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1317 | * @dentry: object | |
1318 | * @name: attribute name | |
1319 | * @value: attribute value | |
1320 | * @size: attribute size | |
1321 | * @flags: unused | |
1322 | * | |
1323 | * Set the pointer in the inode blob to the entry found | |
1324 | * in the master label list. | |
1325 | */ | |
8f0cfa52 DH |
1326 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1327 | const void *value, size_t size, int flags) | |
e114e473 | 1328 | { |
2f823ff8 | 1329 | struct smack_known *skp; |
c6f493d6 | 1330 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1331 | |
2f823ff8 CS |
1332 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1333 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1334 | return; | |
1335 | } | |
1336 | ||
676dac4b | 1337 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1338 | skp = smk_import_entry(value, size); |
e774ad68 | 1339 | if (!IS_ERR(skp)) |
21c7eae2 | 1340 | isp->smk_inode = skp; |
5c6d1125 | 1341 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1342 | skp = smk_import_entry(value, size); |
e774ad68 | 1343 | if (!IS_ERR(skp)) |
2f823ff8 | 1344 | isp->smk_task = skp; |
7898e1f8 | 1345 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1346 | skp = smk_import_entry(value, size); |
e774ad68 | 1347 | if (!IS_ERR(skp)) |
2f823ff8 | 1348 | isp->smk_mmap = skp; |
2f823ff8 | 1349 | } |
e114e473 CS |
1350 | |
1351 | return; | |
1352 | } | |
1353 | ||
ce8a4321 | 1354 | /** |
e114e473 CS |
1355 | * smack_inode_getxattr - Smack check on getxattr |
1356 | * @dentry: the object | |
1357 | * @name: unused | |
1358 | * | |
1359 | * Returns 0 if access is permitted, an error code otherwise | |
1360 | */ | |
8f0cfa52 | 1361 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1362 | { |
ecfcc53f | 1363 | struct smk_audit_info ad; |
d166c802 | 1364 | int rc; |
ecfcc53f | 1365 | |
a269434d | 1366 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1367 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1368 | ||
c6f493d6 DH |
1369 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1370 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1371 | return rc; |
e114e473 CS |
1372 | } |
1373 | ||
ce8a4321 | 1374 | /** |
e114e473 CS |
1375 | * smack_inode_removexattr - Smack check on removexattr |
1376 | * @dentry: the object | |
1377 | * @name: name of the attribute | |
1378 | * | |
1379 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1380 | * | |
1381 | * Returns 0 if access is permitted, an error code otherwise | |
1382 | */ | |
8f0cfa52 | 1383 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1384 | { |
676dac4b | 1385 | struct inode_smack *isp; |
ecfcc53f | 1386 | struct smk_audit_info ad; |
bcdca225 | 1387 | int rc = 0; |
e114e473 | 1388 | |
bcdca225 CS |
1389 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1390 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1391 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1392 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1393 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1394 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1395 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1396 | rc = -EPERM; |
1397 | } else | |
1398 | rc = cap_inode_removexattr(dentry, name); | |
1399 | ||
f59bdfba CS |
1400 | if (rc != 0) |
1401 | return rc; | |
1402 | ||
a269434d | 1403 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1404 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1405 | |
c6f493d6 DH |
1406 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1407 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1408 | if (rc != 0) |
1409 | return rc; | |
1410 | ||
c6f493d6 | 1411 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1412 | /* |
1413 | * Don't do anything special for these. | |
1414 | * XATTR_NAME_SMACKIPIN | |
1415 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1416 | */ |
8012495e | 1417 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1418 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1419 | struct superblock_smack *sbsp = sbp->s_security; |
1420 | ||
1421 | isp->smk_inode = sbsp->smk_default; | |
1422 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1423 | isp->smk_task = NULL; |
f59bdfba | 1424 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1425 | isp->smk_mmap = NULL; |
f59bdfba CS |
1426 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1427 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1428 | |
f59bdfba | 1429 | return 0; |
e114e473 CS |
1430 | } |
1431 | ||
1432 | /** | |
1433 | * smack_inode_getsecurity - get smack xattrs | |
1434 | * @inode: the object | |
1435 | * @name: attribute name | |
1436 | * @buffer: where to put the result | |
57e7ba04 | 1437 | * @alloc: duplicate memory |
e114e473 CS |
1438 | * |
1439 | * Returns the size of the attribute or an error code | |
1440 | */ | |
ea861dfd | 1441 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1442 | const char *name, void **buffer, |
1443 | bool alloc) | |
1444 | { | |
1445 | struct socket_smack *ssp; | |
1446 | struct socket *sock; | |
1447 | struct super_block *sbp; | |
1448 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1449 | struct smack_known *isp; |
e114e473 | 1450 | |
57e7ba04 | 1451 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1452 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1453 | else { |
1454 | /* | |
1455 | * The rest of the Smack xattrs are only on sockets. | |
1456 | */ | |
1457 | sbp = ip->i_sb; | |
1458 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1459 | return -EOPNOTSUPP; | |
e114e473 | 1460 | |
57e7ba04 CS |
1461 | sock = SOCKET_I(ip); |
1462 | if (sock == NULL || sock->sk == NULL) | |
1463 | return -EOPNOTSUPP; | |
e114e473 | 1464 | |
57e7ba04 | 1465 | ssp = sock->sk->sk_security; |
e114e473 | 1466 | |
57e7ba04 CS |
1467 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1468 | isp = ssp->smk_in; | |
1469 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1470 | isp = ssp->smk_out; | |
1471 | else | |
1472 | return -EOPNOTSUPP; | |
1473 | } | |
e114e473 | 1474 | |
57e7ba04 CS |
1475 | if (alloc) { |
1476 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1477 | if (*buffer == NULL) | |
1478 | return -ENOMEM; | |
e114e473 CS |
1479 | } |
1480 | ||
57e7ba04 | 1481 | return strlen(isp->smk_known); |
e114e473 CS |
1482 | } |
1483 | ||
1484 | ||
1485 | /** | |
1486 | * smack_inode_listsecurity - list the Smack attributes | |
1487 | * @inode: the object | |
1488 | * @buffer: where they go | |
1489 | * @buffer_size: size of buffer | |
e114e473 CS |
1490 | */ |
1491 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1492 | size_t buffer_size) | |
1493 | { | |
fd5c9d23 | 1494 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1495 | |
fd5c9d23 | 1496 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1497 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1498 | |
1499 | return len; | |
e114e473 CS |
1500 | } |
1501 | ||
d20bdda6 AD |
1502 | /** |
1503 | * smack_inode_getsecid - Extract inode's security id | |
1504 | * @inode: inode to extract the info from | |
1505 | * @secid: where result will be saved | |
1506 | */ | |
d6335d77 | 1507 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1508 | { |
0f8983cf | 1509 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1510 | |
0f8983cf | 1511 | *secid = skp->smk_secid; |
d20bdda6 AD |
1512 | } |
1513 | ||
e114e473 CS |
1514 | /* |
1515 | * File Hooks | |
1516 | */ | |
1517 | ||
491a0b08 CS |
1518 | /* |
1519 | * There is no smack_file_permission hook | |
e114e473 CS |
1520 | * |
1521 | * Should access checks be done on each read or write? | |
1522 | * UNICOS and SELinux say yes. | |
1523 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1524 | * | |
1525 | * I'll say no for now. Smack does not do the frequent | |
1526 | * label changing that SELinux does. | |
1527 | */ | |
e114e473 CS |
1528 | |
1529 | /** | |
1530 | * smack_file_alloc_security - assign a file security blob | |
1531 | * @file: the object | |
1532 | * | |
1533 | * The security blob for a file is a pointer to the master | |
1534 | * label list, so no allocation is done. | |
1535 | * | |
5e7270a6 CS |
1536 | * f_security is the owner security information. It |
1537 | * isn't used on file access checks, it's for send_sigio. | |
1538 | * | |
e114e473 CS |
1539 | * Returns 0 |
1540 | */ | |
1541 | static int smack_file_alloc_security(struct file *file) | |
1542 | { | |
2f823ff8 CS |
1543 | struct smack_known *skp = smk_of_current(); |
1544 | ||
21c7eae2 | 1545 | file->f_security = skp; |
e114e473 CS |
1546 | return 0; |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * smack_file_free_security - clear a file security blob | |
1551 | * @file: the object | |
1552 | * | |
1553 | * The security blob for a file is a pointer to the master | |
1554 | * label list, so no memory is freed. | |
1555 | */ | |
1556 | static void smack_file_free_security(struct file *file) | |
1557 | { | |
1558 | file->f_security = NULL; | |
1559 | } | |
1560 | ||
1561 | /** | |
1562 | * smack_file_ioctl - Smack check on ioctls | |
1563 | * @file: the object | |
1564 | * @cmd: what to do | |
1565 | * @arg: unused | |
1566 | * | |
1567 | * Relies heavily on the correct use of the ioctl command conventions. | |
1568 | * | |
1569 | * Returns 0 if allowed, error code otherwise | |
1570 | */ | |
1571 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1572 | unsigned long arg) | |
1573 | { | |
1574 | int rc = 0; | |
ecfcc53f | 1575 | struct smk_audit_info ad; |
5e7270a6 | 1576 | struct inode *inode = file_inode(file); |
ecfcc53f | 1577 | |
83a1e53f SWK |
1578 | if (unlikely(IS_PRIVATE(inode))) |
1579 | return 0; | |
1580 | ||
f48b7399 | 1581 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1582 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1583 | |
d166c802 | 1584 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1585 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1586 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1587 | } | |
e114e473 | 1588 | |
d166c802 | 1589 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1590 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1591 | rc = smk_bu_file(file, MAY_READ, rc); |
1592 | } | |
e114e473 CS |
1593 | |
1594 | return rc; | |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * smack_file_lock - Smack check on file locking | |
1599 | * @file: the object | |
251a2a95 | 1600 | * @cmd: unused |
e114e473 | 1601 | * |
c0ab6e56 | 1602 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1603 | */ |
1604 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1605 | { | |
ecfcc53f | 1606 | struct smk_audit_info ad; |
d166c802 | 1607 | int rc; |
5e7270a6 | 1608 | struct inode *inode = file_inode(file); |
ecfcc53f | 1609 | |
83a1e53f SWK |
1610 | if (unlikely(IS_PRIVATE(inode))) |
1611 | return 0; | |
1612 | ||
92f42509 EP |
1613 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1614 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1615 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1616 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1617 | return rc; | |
e114e473 CS |
1618 | } |
1619 | ||
1620 | /** | |
1621 | * smack_file_fcntl - Smack check on fcntl | |
1622 | * @file: the object | |
1623 | * @cmd: what action to check | |
1624 | * @arg: unused | |
1625 | * | |
531f1d45 CS |
1626 | * Generally these operations are harmless. |
1627 | * File locking operations present an obvious mechanism | |
1628 | * for passing information, so they require write access. | |
1629 | * | |
e114e473 CS |
1630 | * Returns 0 if current has access, error code otherwise |
1631 | */ | |
1632 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1633 | unsigned long arg) | |
1634 | { | |
ecfcc53f | 1635 | struct smk_audit_info ad; |
531f1d45 | 1636 | int rc = 0; |
5e7270a6 | 1637 | struct inode *inode = file_inode(file); |
ecfcc53f | 1638 | |
83a1e53f SWK |
1639 | if (unlikely(IS_PRIVATE(inode))) |
1640 | return 0; | |
1641 | ||
e114e473 | 1642 | switch (cmd) { |
e114e473 | 1643 | case F_GETLK: |
c0ab6e56 | 1644 | break; |
e114e473 CS |
1645 | case F_SETLK: |
1646 | case F_SETLKW: | |
c0ab6e56 CS |
1647 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1648 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1649 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1650 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1651 | break; |
e114e473 CS |
1652 | case F_SETOWN: |
1653 | case F_SETSIG: | |
531f1d45 CS |
1654 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1655 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1656 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1657 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1658 | break; |
1659 | default: | |
531f1d45 | 1660 | break; |
e114e473 CS |
1661 | } |
1662 | ||
1663 | return rc; | |
1664 | } | |
1665 | ||
7898e1f8 | 1666 | /** |
e5467859 | 1667 | * smack_mmap_file : |
7898e1f8 CS |
1668 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1669 | * if mapping anonymous memory. | |
1670 | * @file contains the file structure for file to map (may be NULL). | |
1671 | * @reqprot contains the protection requested by the application. | |
1672 | * @prot contains the protection that will be applied by the kernel. | |
1673 | * @flags contains the operational flags. | |
1674 | * Return 0 if permission is granted. | |
1675 | */ | |
e5467859 | 1676 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1677 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1678 | unsigned long flags) |
7898e1f8 | 1679 | { |
272cd7a8 | 1680 | struct smack_known *skp; |
2f823ff8 | 1681 | struct smack_known *mkp; |
7898e1f8 CS |
1682 | struct smack_rule *srp; |
1683 | struct task_smack *tsp; | |
21c7eae2 | 1684 | struct smack_known *okp; |
7898e1f8 | 1685 | struct inode_smack *isp; |
809c02e0 | 1686 | struct superblock_smack *sbsp; |
0e0a070d CS |
1687 | int may; |
1688 | int mmay; | |
1689 | int tmay; | |
7898e1f8 CS |
1690 | int rc; |
1691 | ||
496ad9aa | 1692 | if (file == NULL) |
7898e1f8 CS |
1693 | return 0; |
1694 | ||
83a1e53f SWK |
1695 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1696 | return 0; | |
1697 | ||
496ad9aa | 1698 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1699 | if (isp->smk_mmap == NULL) |
1700 | return 0; | |
809c02e0 SF |
1701 | sbsp = file_inode(file)->i_sb->s_security; |
1702 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && | |
1703 | isp->smk_mmap != sbsp->smk_root) | |
1704 | return -EACCES; | |
2f823ff8 | 1705 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1706 | |
1707 | tsp = current_security(); | |
2f823ff8 | 1708 | skp = smk_of_current(); |
7898e1f8 CS |
1709 | rc = 0; |
1710 | ||
1711 | rcu_read_lock(); | |
1712 | /* | |
1713 | * For each Smack rule associated with the subject | |
1714 | * label verify that the SMACK64MMAP also has access | |
1715 | * to that rule's object label. | |
7898e1f8 | 1716 | */ |
272cd7a8 | 1717 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1718 | okp = srp->smk_object; |
7898e1f8 CS |
1719 | /* |
1720 | * Matching labels always allows access. | |
1721 | */ | |
21c7eae2 | 1722 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1723 | continue; |
0e0a070d CS |
1724 | /* |
1725 | * If there is a matching local rule take | |
1726 | * that into account as well. | |
1727 | */ | |
21c7eae2 LP |
1728 | may = smk_access_entry(srp->smk_subject->smk_known, |
1729 | okp->smk_known, | |
1730 | &tsp->smk_rules); | |
0e0a070d CS |
1731 | if (may == -ENOENT) |
1732 | may = srp->smk_access; | |
1733 | else | |
1734 | may &= srp->smk_access; | |
1735 | /* | |
1736 | * If may is zero the SMACK64MMAP subject can't | |
1737 | * possibly have less access. | |
1738 | */ | |
1739 | if (may == 0) | |
1740 | continue; | |
1741 | ||
1742 | /* | |
1743 | * Fetch the global list entry. | |
1744 | * If there isn't one a SMACK64MMAP subject | |
1745 | * can't have as much access as current. | |
1746 | */ | |
21c7eae2 LP |
1747 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1748 | &mkp->smk_rules); | |
0e0a070d CS |
1749 | if (mmay == -ENOENT) { |
1750 | rc = -EACCES; | |
1751 | break; | |
1752 | } | |
1753 | /* | |
1754 | * If there is a local entry it modifies the | |
1755 | * potential access, too. | |
1756 | */ | |
21c7eae2 LP |
1757 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1758 | &tsp->smk_rules); | |
0e0a070d CS |
1759 | if (tmay != -ENOENT) |
1760 | mmay &= tmay; | |
7898e1f8 | 1761 | |
0e0a070d CS |
1762 | /* |
1763 | * If there is any access available to current that is | |
1764 | * not available to a SMACK64MMAP subject | |
1765 | * deny access. | |
1766 | */ | |
75a25637 | 1767 | if ((may | mmay) != mmay) { |
0e0a070d | 1768 | rc = -EACCES; |
7898e1f8 | 1769 | break; |
0e0a070d | 1770 | } |
7898e1f8 CS |
1771 | } |
1772 | ||
1773 | rcu_read_unlock(); | |
1774 | ||
1775 | return rc; | |
1776 | } | |
1777 | ||
e114e473 CS |
1778 | /** |
1779 | * smack_file_set_fowner - set the file security blob value | |
1780 | * @file: object in question | |
1781 | * | |
e114e473 | 1782 | */ |
e0b93edd | 1783 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1784 | { |
5e7270a6 | 1785 | file->f_security = smk_of_current(); |
e114e473 CS |
1786 | } |
1787 | ||
1788 | /** | |
1789 | * smack_file_send_sigiotask - Smack on sigio | |
1790 | * @tsk: The target task | |
1791 | * @fown: the object the signal come from | |
1792 | * @signum: unused | |
1793 | * | |
1794 | * Allow a privileged task to get signals even if it shouldn't | |
1795 | * | |
1796 | * Returns 0 if a subject with the object's smack could | |
1797 | * write to the task, an error code otherwise. | |
1798 | */ | |
1799 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1800 | struct fown_struct *fown, int signum) | |
1801 | { | |
2f823ff8 CS |
1802 | struct smack_known *skp; |
1803 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
dcb569cf | 1804 | const struct cred *tcred; |
e114e473 CS |
1805 | struct file *file; |
1806 | int rc; | |
ecfcc53f | 1807 | struct smk_audit_info ad; |
e114e473 CS |
1808 | |
1809 | /* | |
1810 | * struct fown_struct is never outside the context of a struct file | |
1811 | */ | |
1812 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1813 | |
ecfcc53f | 1814 | /* we don't log here as rc can be overriden */ |
21c7eae2 | 1815 | skp = file->f_security; |
c60b9066 CS |
1816 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1817 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1818 | |
1819 | rcu_read_lock(); | |
1820 | tcred = __task_cred(tsk); | |
1821 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1822 | rc = 0; |
dcb569cf | 1823 | rcu_read_unlock(); |
ecfcc53f EB |
1824 | |
1825 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1826 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1827 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1828 | return rc; |
1829 | } | |
1830 | ||
1831 | /** | |
1832 | * smack_file_receive - Smack file receive check | |
1833 | * @file: the object | |
1834 | * | |
1835 | * Returns 0 if current has access, error code otherwise | |
1836 | */ | |
1837 | static int smack_file_receive(struct file *file) | |
1838 | { | |
d166c802 | 1839 | int rc; |
e114e473 | 1840 | int may = 0; |
ecfcc53f | 1841 | struct smk_audit_info ad; |
5e7270a6 | 1842 | struct inode *inode = file_inode(file); |
79be0935 CS |
1843 | struct socket *sock; |
1844 | struct task_smack *tsp; | |
1845 | struct socket_smack *ssp; | |
e114e473 | 1846 | |
9777582e SWK |
1847 | if (unlikely(IS_PRIVATE(inode))) |
1848 | return 0; | |
1849 | ||
4482a44f | 1850 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1851 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1852 | |
51d59af2 | 1853 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1854 | sock = SOCKET_I(inode); |
1855 | ssp = sock->sk->sk_security; | |
1856 | tsp = current_security(); | |
1857 | /* | |
1858 | * If the receiving process can't write to the | |
1859 | * passed socket or if the passed socket can't | |
1860 | * write to the receiving process don't accept | |
1861 | * the passed socket. | |
1862 | */ | |
1863 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1864 | rc = smk_bu_file(file, may, rc); | |
1865 | if (rc < 0) | |
1866 | return rc; | |
1867 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1868 | rc = smk_bu_file(file, may, rc); | |
1869 | return rc; | |
1870 | } | |
e114e473 CS |
1871 | /* |
1872 | * This code relies on bitmasks. | |
1873 | */ | |
1874 | if (file->f_mode & FMODE_READ) | |
1875 | may = MAY_READ; | |
1876 | if (file->f_mode & FMODE_WRITE) | |
1877 | may |= MAY_WRITE; | |
1878 | ||
5e7270a6 | 1879 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1880 | rc = smk_bu_file(file, may, rc); |
1881 | return rc; | |
e114e473 CS |
1882 | } |
1883 | ||
531f1d45 | 1884 | /** |
83d49856 | 1885 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1886 | * @file: the object |
a6834c0b | 1887 | * @cred: task credential |
531f1d45 CS |
1888 | * |
1889 | * Set the security blob in the file structure. | |
a6834c0b CS |
1890 | * Allow the open only if the task has read access. There are |
1891 | * many read operations (e.g. fstat) that you can do with an | |
1892 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1893 | * |
1894 | * Returns 0 | |
1895 | */ | |
94817692 | 1896 | static int smack_file_open(struct file *file) |
531f1d45 | 1897 | { |
94817692 | 1898 | struct task_smack *tsp = file->f_cred->security; |
5e7270a6 | 1899 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1900 | struct smk_audit_info ad; |
1901 | int rc; | |
531f1d45 | 1902 | |
a6834c0b CS |
1903 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1904 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1905 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1906 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1907 | |
1908 | return rc; | |
531f1d45 CS |
1909 | } |
1910 | ||
e114e473 CS |
1911 | /* |
1912 | * Task hooks | |
1913 | */ | |
1914 | ||
ee18d64c DH |
1915 | /** |
1916 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1917 | * @new: the new credentials | |
1918 | * @gfp: the atomicity of any memory allocations | |
1919 | * | |
1920 | * Prepare a blank set of credentials for modification. This must allocate all | |
1921 | * the memory the LSM module might require such that cred_transfer() can | |
1922 | * complete without error. | |
1923 | */ | |
1924 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1925 | { | |
7898e1f8 CS |
1926 | struct task_smack *tsp; |
1927 | ||
1928 | tsp = new_task_smack(NULL, NULL, gfp); | |
1929 | if (tsp == NULL) | |
676dac4b | 1930 | return -ENOMEM; |
7898e1f8 CS |
1931 | |
1932 | cred->security = tsp; | |
1933 | ||
ee18d64c DH |
1934 | return 0; |
1935 | } | |
1936 | ||
1937 | ||
e114e473 | 1938 | /** |
f1752eec DH |
1939 | * smack_cred_free - "free" task-level security credentials |
1940 | * @cred: the credentials in question | |
e114e473 | 1941 | * |
e114e473 | 1942 | */ |
f1752eec | 1943 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1944 | { |
7898e1f8 CS |
1945 | struct task_smack *tsp = cred->security; |
1946 | struct smack_rule *rp; | |
1947 | struct list_head *l; | |
1948 | struct list_head *n; | |
1949 | ||
1950 | if (tsp == NULL) | |
1951 | return; | |
1952 | cred->security = NULL; | |
1953 | ||
38416e53 ZJ |
1954 | smk_destroy_label_list(&tsp->smk_relabel); |
1955 | ||
7898e1f8 CS |
1956 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1957 | rp = list_entry(l, struct smack_rule, list); | |
1958 | list_del(&rp->list); | |
1959 | kfree(rp); | |
1960 | } | |
1961 | kfree(tsp); | |
e114e473 CS |
1962 | } |
1963 | ||
d84f4f99 DH |
1964 | /** |
1965 | * smack_cred_prepare - prepare new set of credentials for modification | |
1966 | * @new: the new credentials | |
1967 | * @old: the original credentials | |
1968 | * @gfp: the atomicity of any memory allocations | |
1969 | * | |
1970 | * Prepare a new set of credentials for modification. | |
1971 | */ | |
1972 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1973 | gfp_t gfp) | |
1974 | { | |
676dac4b CS |
1975 | struct task_smack *old_tsp = old->security; |
1976 | struct task_smack *new_tsp; | |
7898e1f8 | 1977 | int rc; |
676dac4b | 1978 | |
7898e1f8 | 1979 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1980 | if (new_tsp == NULL) |
1981 | return -ENOMEM; | |
1982 | ||
b437aba8 HS |
1983 | new->security = new_tsp; |
1984 | ||
7898e1f8 CS |
1985 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1986 | if (rc != 0) | |
1987 | return rc; | |
1988 | ||
38416e53 ZJ |
1989 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
1990 | gfp); | |
1991 | if (rc != 0) | |
1992 | return rc; | |
1993 | ||
d84f4f99 DH |
1994 | return 0; |
1995 | } | |
1996 | ||
ee18d64c DH |
1997 | /** |
1998 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1999 | * @new: the new credentials | |
2000 | * @old: the original credentials | |
2001 | * | |
2002 | * Fill in a set of blank credentials from another set of credentials. | |
2003 | */ | |
2004 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2005 | { | |
676dac4b CS |
2006 | struct task_smack *old_tsp = old->security; |
2007 | struct task_smack *new_tsp = new->security; | |
2008 | ||
2009 | new_tsp->smk_task = old_tsp->smk_task; | |
2010 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2011 | mutex_init(&new_tsp->smk_rules_lock); |
2012 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2013 | ||
2014 | ||
2015 | /* cbs copy rule list */ | |
ee18d64c DH |
2016 | } |
2017 | ||
3ec30113 MG |
2018 | /** |
2019 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
2020 | * @c: the object creds | |
2021 | * @secid: where to put the result | |
2022 | * | |
2023 | * Sets the secid to contain a u32 version of the smack label. | |
2024 | */ | |
2025 | static void smack_cred_getsecid(const struct cred *c, u32 *secid) | |
2026 | { | |
2027 | struct smack_known *skp; | |
2028 | ||
2029 | rcu_read_lock(); | |
2030 | skp = smk_of_task(c->security); | |
2031 | *secid = skp->smk_secid; | |
2032 | rcu_read_unlock(); | |
2033 | } | |
2034 | ||
3a3b7ce9 DH |
2035 | /** |
2036 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2037 | * @new: points to the set of credentials to be modified. |
2038 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2039 | * |
2040 | * Set the security data for a kernel service. | |
2041 | */ | |
2042 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2043 | { | |
676dac4b | 2044 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 | 2045 | |
152f91d4 | 2046 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2047 | return 0; |
2048 | } | |
2049 | ||
2050 | /** | |
2051 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2052 | * @new: points to the set of credentials to be modified |
2053 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2054 | * |
2055 | * Set the file creation context in a set of credentials to the same | |
2056 | * as the objective context of the specified inode | |
2057 | */ | |
2058 | static int smack_kernel_create_files_as(struct cred *new, | |
2059 | struct inode *inode) | |
2060 | { | |
2061 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2062 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2063 | |
21c7eae2 | 2064 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2065 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2066 | return 0; |
2067 | } | |
2068 | ||
ecfcc53f EB |
2069 | /** |
2070 | * smk_curacc_on_task - helper to log task related access | |
2071 | * @p: the task object | |
531f1d45 CS |
2072 | * @access: the access requested |
2073 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2074 | * |
2075 | * Return 0 if access is permitted | |
2076 | */ | |
531f1d45 CS |
2077 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2078 | const char *caller) | |
ecfcc53f EB |
2079 | { |
2080 | struct smk_audit_info ad; | |
6d1cff2a | 2081 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2082 | int rc; |
ecfcc53f | 2083 | |
531f1d45 | 2084 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2085 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2086 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2087 | rc = smk_bu_task(p, access, rc); |
2088 | return rc; | |
ecfcc53f EB |
2089 | } |
2090 | ||
e114e473 CS |
2091 | /** |
2092 | * smack_task_setpgid - Smack check on setting pgid | |
2093 | * @p: the task object | |
2094 | * @pgid: unused | |
2095 | * | |
2096 | * Return 0 if write access is permitted | |
2097 | */ | |
2098 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2099 | { | |
531f1d45 | 2100 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2101 | } |
2102 | ||
2103 | /** | |
2104 | * smack_task_getpgid - Smack access check for getpgid | |
2105 | * @p: the object task | |
2106 | * | |
2107 | * Returns 0 if current can read the object task, error code otherwise | |
2108 | */ | |
2109 | static int smack_task_getpgid(struct task_struct *p) | |
2110 | { | |
531f1d45 | 2111 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2112 | } |
2113 | ||
2114 | /** | |
2115 | * smack_task_getsid - Smack access check for getsid | |
2116 | * @p: the object task | |
2117 | * | |
2118 | * Returns 0 if current can read the object task, error code otherwise | |
2119 | */ | |
2120 | static int smack_task_getsid(struct task_struct *p) | |
2121 | { | |
531f1d45 | 2122 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2123 | } |
2124 | ||
2125 | /** | |
2126 | * smack_task_getsecid - get the secid of the task | |
2127 | * @p: the object task | |
2128 | * @secid: where to put the result | |
2129 | * | |
2130 | * Sets the secid to contain a u32 version of the smack label. | |
2131 | */ | |
2132 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2133 | { | |
6d1cff2a | 2134 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2135 | |
2136 | *secid = skp->smk_secid; | |
e114e473 CS |
2137 | } |
2138 | ||
2139 | /** | |
2140 | * smack_task_setnice - Smack check on setting nice | |
2141 | * @p: the task object | |
2142 | * @nice: unused | |
2143 | * | |
2144 | * Return 0 if write access is permitted | |
2145 | */ | |
2146 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2147 | { | |
b1d9e6b0 | 2148 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2149 | } |
2150 | ||
2151 | /** | |
2152 | * smack_task_setioprio - Smack check on setting ioprio | |
2153 | * @p: the task object | |
2154 | * @ioprio: unused | |
2155 | * | |
2156 | * Return 0 if write access is permitted | |
2157 | */ | |
2158 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2159 | { | |
b1d9e6b0 | 2160 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2161 | } |
2162 | ||
2163 | /** | |
2164 | * smack_task_getioprio - Smack check on reading ioprio | |
2165 | * @p: the task object | |
2166 | * | |
2167 | * Return 0 if read access is permitted | |
2168 | */ | |
2169 | static int smack_task_getioprio(struct task_struct *p) | |
2170 | { | |
531f1d45 | 2171 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2172 | } |
2173 | ||
2174 | /** | |
2175 | * smack_task_setscheduler - Smack check on setting scheduler | |
2176 | * @p: the task object | |
2177 | * @policy: unused | |
2178 | * @lp: unused | |
2179 | * | |
2180 | * Return 0 if read access is permitted | |
2181 | */ | |
b0ae1981 | 2182 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2183 | { |
b1d9e6b0 | 2184 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2185 | } |
2186 | ||
2187 | /** | |
2188 | * smack_task_getscheduler - Smack check on reading scheduler | |
2189 | * @p: the task object | |
2190 | * | |
2191 | * Return 0 if read access is permitted | |
2192 | */ | |
2193 | static int smack_task_getscheduler(struct task_struct *p) | |
2194 | { | |
531f1d45 | 2195 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2196 | } |
2197 | ||
2198 | /** | |
2199 | * smack_task_movememory - Smack check on moving memory | |
2200 | * @p: the task object | |
2201 | * | |
2202 | * Return 0 if write access is permitted | |
2203 | */ | |
2204 | static int smack_task_movememory(struct task_struct *p) | |
2205 | { | |
531f1d45 | 2206 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2207 | } |
2208 | ||
2209 | /** | |
2210 | * smack_task_kill - Smack check on signal delivery | |
2211 | * @p: the task object | |
2212 | * @info: unused | |
2213 | * @sig: unused | |
6b4f3d01 | 2214 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2215 | * |
2216 | * Return 0 if write access is permitted | |
2217 | * | |
e114e473 | 2218 | */ |
ae7795bc | 2219 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2220 | int sig, const struct cred *cred) |
e114e473 | 2221 | { |
ecfcc53f | 2222 | struct smk_audit_info ad; |
2f823ff8 | 2223 | struct smack_known *skp; |
6d1cff2a | 2224 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2225 | int rc; |
ecfcc53f | 2226 | |
18d872f7 RK |
2227 | if (!sig) |
2228 | return 0; /* null signal; existence test */ | |
2229 | ||
ecfcc53f EB |
2230 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2231 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2232 | /* |
2233 | * Sending a signal requires that the sender | |
2234 | * can write the receiver. | |
2235 | */ | |
6b4f3d01 | 2236 | if (cred == NULL) { |
c60b9066 CS |
2237 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2238 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2239 | return rc; |
2240 | } | |
e114e473 | 2241 | /* |
6b4f3d01 | 2242 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2243 | * specific behavior. This is not clean. For one thing |
2244 | * we can't take privilege into account. | |
2245 | */ | |
6b4f3d01 | 2246 | skp = smk_of_task(cred->security); |
c60b9066 CS |
2247 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2248 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2249 | return rc; |
e114e473 CS |
2250 | } |
2251 | ||
e114e473 CS |
2252 | /** |
2253 | * smack_task_to_inode - copy task smack into the inode blob | |
2254 | * @p: task to copy from | |
251a2a95 | 2255 | * @inode: inode to copy to |
e114e473 CS |
2256 | * |
2257 | * Sets the smack pointer in the inode security blob | |
2258 | */ | |
2259 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2260 | { | |
2261 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2262 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2263 | |
21c7eae2 | 2264 | isp->smk_inode = skp; |
7b4e8843 | 2265 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2266 | } |
2267 | ||
2268 | /* | |
2269 | * Socket hooks. | |
2270 | */ | |
2271 | ||
2272 | /** | |
2273 | * smack_sk_alloc_security - Allocate a socket blob | |
2274 | * @sk: the socket | |
2275 | * @family: unused | |
251a2a95 | 2276 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2277 | * |
2278 | * Assign Smack pointers to current | |
2279 | * | |
2280 | * Returns 0 on success, -ENOMEM is there's no memory | |
2281 | */ | |
2282 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2283 | { | |
2f823ff8 | 2284 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2285 | struct socket_smack *ssp; |
2286 | ||
2287 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2288 | if (ssp == NULL) | |
2289 | return -ENOMEM; | |
2290 | ||
08382c9f | 2291 | /* |
2292 | * Sockets created by kernel threads receive web label. | |
2293 | */ | |
2294 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2295 | ssp->smk_in = &smack_known_web; | |
2296 | ssp->smk_out = &smack_known_web; | |
2297 | } else { | |
2298 | ssp->smk_in = skp; | |
2299 | ssp->smk_out = skp; | |
2300 | } | |
272cd7a8 | 2301 | ssp->smk_packet = NULL; |
e114e473 CS |
2302 | |
2303 | sk->sk_security = ssp; | |
2304 | ||
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | /** | |
2309 | * smack_sk_free_security - Free a socket blob | |
2310 | * @sk: the socket | |
2311 | * | |
2312 | * Clears the blob pointer | |
2313 | */ | |
2314 | static void smack_sk_free_security(struct sock *sk) | |
2315 | { | |
0c96d1f5 VG |
2316 | #ifdef SMACK_IPV6_PORT_LABELING |
2317 | struct smk_port_label *spp; | |
2318 | ||
2319 | if (sk->sk_family == PF_INET6) { | |
2320 | rcu_read_lock(); | |
2321 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2322 | if (spp->smk_sock != sk) | |
2323 | continue; | |
2324 | spp->smk_can_reuse = 1; | |
2325 | break; | |
2326 | } | |
2327 | rcu_read_unlock(); | |
2328 | } | |
2329 | #endif | |
e114e473 CS |
2330 | kfree(sk->sk_security); |
2331 | } | |
2332 | ||
07feee8f | 2333 | /** |
21abb1ec | 2334 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2335 | * @sip: the object end |
2336 | * | |
2337 | * looks for host based access restrictions | |
2338 | * | |
2339 | * This version will only be appropriate for really small sets of single label | |
2340 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2341 | * taken before calling this function. | |
2342 | * | |
2343 | * Returns the label of the far end or NULL if it's not special. | |
2344 | */ | |
21abb1ec | 2345 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2346 | { |
21abb1ec | 2347 | struct smk_net4addr *snp; |
07feee8f PM |
2348 | struct in_addr *siap = &sip->sin_addr; |
2349 | ||
2350 | if (siap->s_addr == 0) | |
2351 | return NULL; | |
2352 | ||
21abb1ec CS |
2353 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2354 | /* | |
2355 | * we break after finding the first match because | |
2356 | * the list is sorted from longest to shortest mask | |
2357 | * so we have found the most specific match | |
2358 | */ | |
2359 | if (snp->smk_host.s_addr == | |
2360 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2361 | return snp->smk_label; | |
2362 | ||
2363 | return NULL; | |
2364 | } | |
2365 | ||
2366 | #if IS_ENABLED(CONFIG_IPV6) | |
2367 | /* | |
2368 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2369 | * @sip: the address | |
2370 | * | |
2371 | * Returns boolean true if this is the localhost address | |
2372 | */ | |
2373 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2374 | { | |
2375 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2376 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2377 | ||
2378 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2379 | ntohs(be16p[7]) == 1) | |
2380 | return true; | |
2381 | return false; | |
2382 | } | |
2383 | ||
2384 | /** | |
2385 | * smack_ipv6host_label - check host based restrictions | |
2386 | * @sip: the object end | |
2387 | * | |
2388 | * looks for host based access restrictions | |
2389 | * | |
2390 | * This version will only be appropriate for really small sets of single label | |
2391 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2392 | * taken before calling this function. | |
2393 | * | |
2394 | * Returns the label of the far end or NULL if it's not special. | |
2395 | */ | |
2396 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2397 | { | |
2398 | struct smk_net6addr *snp; | |
2399 | struct in6_addr *sap = &sip->sin6_addr; | |
2400 | int i; | |
2401 | int found = 0; | |
2402 | ||
2403 | /* | |
2404 | * It's local. Don't look for a host label. | |
2405 | */ | |
2406 | if (smk_ipv6_localhost(sip)) | |
2407 | return NULL; | |
2408 | ||
2409 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2410 | /* |
2411 | * If the label is NULL the entry has | |
2412 | * been renounced. Ignore it. | |
2413 | */ | |
2414 | if (snp->smk_label == NULL) | |
2415 | continue; | |
07feee8f PM |
2416 | /* |
2417 | * we break after finding the first match because | |
2418 | * the list is sorted from longest to shortest mask | |
2419 | * so we have found the most specific match | |
2420 | */ | |
21abb1ec | 2421 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2422 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2423 | snp->smk_host.s6_addr16[i]) { | |
2424 | found = 0; | |
2425 | break; | |
2426 | } | |
4303154e | 2427 | } |
21abb1ec CS |
2428 | if (found) |
2429 | return snp->smk_label; | |
2430 | } | |
07feee8f PM |
2431 | |
2432 | return NULL; | |
2433 | } | |
21abb1ec | 2434 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2435 | |
e114e473 CS |
2436 | /** |
2437 | * smack_netlabel - Set the secattr on a socket | |
2438 | * @sk: the socket | |
6d3dc07c | 2439 | * @labeled: socket label scheme |
e114e473 CS |
2440 | * |
2441 | * Convert the outbound smack value (smk_out) to a | |
2442 | * secattr and attach it to the socket. | |
2443 | * | |
2444 | * Returns 0 on success or an error code | |
2445 | */ | |
6d3dc07c | 2446 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2447 | { |
f7112e6c | 2448 | struct smack_known *skp; |
07feee8f | 2449 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2450 | int rc = 0; |
e114e473 | 2451 | |
6d3dc07c CS |
2452 | /* |
2453 | * Usually the netlabel code will handle changing the | |
2454 | * packet labeling based on the label. | |
2455 | * The case of a single label host is different, because | |
2456 | * a single label host should never get a labeled packet | |
2457 | * even though the label is usually associated with a packet | |
2458 | * label. | |
2459 | */ | |
2460 | local_bh_disable(); | |
2461 | bh_lock_sock_nested(sk); | |
2462 | ||
2463 | if (ssp->smk_out == smack_net_ambient || | |
2464 | labeled == SMACK_UNLABELED_SOCKET) | |
2465 | netlbl_sock_delattr(sk); | |
2466 | else { | |
2f823ff8 | 2467 | skp = ssp->smk_out; |
f7112e6c | 2468 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2469 | } |
2470 | ||
2471 | bh_unlock_sock(sk); | |
2472 | local_bh_enable(); | |
4bc87e62 | 2473 | |
e114e473 CS |
2474 | return rc; |
2475 | } | |
2476 | ||
07feee8f PM |
2477 | /** |
2478 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2479 | * @sk: the socket | |
2480 | * @sap: the destination address | |
2481 | * | |
2482 | * Set the correct secattr for the given socket based on the destination | |
2483 | * address and perform any outbound access checks needed. | |
2484 | * | |
2485 | * Returns 0 on success or an error code. | |
2486 | * | |
2487 | */ | |
2488 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2489 | { | |
2f823ff8 | 2490 | struct smack_known *skp; |
07feee8f PM |
2491 | int rc; |
2492 | int sk_lbl; | |
21c7eae2 | 2493 | struct smack_known *hkp; |
07feee8f | 2494 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2495 | struct smk_audit_info ad; |
07feee8f PM |
2496 | |
2497 | rcu_read_lock(); | |
21abb1ec | 2498 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2499 | if (hkp != NULL) { |
ecfcc53f | 2500 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2501 | struct lsm_network_audit net; |
2502 | ||
48c62af6 EP |
2503 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2504 | ad.a.u.net->family = sap->sin_family; | |
2505 | ad.a.u.net->dport = sap->sin_port; | |
2506 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2507 | #endif |
923e9a13 | 2508 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2509 | skp = ssp->smk_out; |
21c7eae2 LP |
2510 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2511 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2512 | } else { |
2513 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2514 | rc = 0; | |
2515 | } | |
2516 | rcu_read_unlock(); | |
2517 | if (rc != 0) | |
2518 | return rc; | |
2519 | ||
2520 | return smack_netlabel(sk, sk_lbl); | |
2521 | } | |
2522 | ||
21abb1ec CS |
2523 | #if IS_ENABLED(CONFIG_IPV6) |
2524 | /** | |
2525 | * smk_ipv6_check - check Smack access | |
2526 | * @subject: subject Smack label | |
2527 | * @object: object Smack label | |
2528 | * @address: address | |
2529 | * @act: the action being taken | |
2530 | * | |
2531 | * Check an IPv6 access | |
2532 | */ | |
2533 | static int smk_ipv6_check(struct smack_known *subject, | |
2534 | struct smack_known *object, | |
2535 | struct sockaddr_in6 *address, int act) | |
2536 | { | |
2537 | #ifdef CONFIG_AUDIT | |
2538 | struct lsm_network_audit net; | |
2539 | #endif | |
2540 | struct smk_audit_info ad; | |
2541 | int rc; | |
2542 | ||
2543 | #ifdef CONFIG_AUDIT | |
2544 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2545 | ad.a.u.net->family = PF_INET6; | |
2546 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2547 | if (act == SMK_RECEIVING) | |
2548 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2549 | else | |
2550 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2551 | #endif | |
2552 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2553 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2554 | return rc; | |
2555 | } | |
2556 | #endif /* CONFIG_IPV6 */ | |
2557 | ||
2558 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2559 | /** |
2560 | * smk_ipv6_port_label - Smack port access table management | |
2561 | * @sock: socket | |
2562 | * @address: address | |
2563 | * | |
2564 | * Create or update the port list entry | |
2565 | */ | |
2566 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2567 | { | |
2568 | struct sock *sk = sock->sk; | |
2569 | struct sockaddr_in6 *addr6; | |
2570 | struct socket_smack *ssp = sock->sk->sk_security; | |
2571 | struct smk_port_label *spp; | |
2572 | unsigned short port = 0; | |
2573 | ||
2574 | if (address == NULL) { | |
2575 | /* | |
2576 | * This operation is changing the Smack information | |
2577 | * on the bound socket. Take the changes to the port | |
2578 | * as well. | |
2579 | */ | |
3c7ce342 VG |
2580 | rcu_read_lock(); |
2581 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2582 | if (sk != spp->smk_sock) |
2583 | continue; | |
2584 | spp->smk_in = ssp->smk_in; | |
2585 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2586 | rcu_read_unlock(); |
c6739443 CS |
2587 | return; |
2588 | } | |
2589 | /* | |
2590 | * A NULL address is only used for updating existing | |
2591 | * bound entries. If there isn't one, it's OK. | |
2592 | */ | |
3c7ce342 | 2593 | rcu_read_unlock(); |
c6739443 CS |
2594 | return; |
2595 | } | |
2596 | ||
2597 | addr6 = (struct sockaddr_in6 *)address; | |
2598 | port = ntohs(addr6->sin6_port); | |
2599 | /* | |
2600 | * This is a special case that is safely ignored. | |
2601 | */ | |
2602 | if (port == 0) | |
2603 | return; | |
2604 | ||
2605 | /* | |
2606 | * Look for an existing port list entry. | |
2607 | * This is an indication that a port is getting reused. | |
2608 | */ | |
3c7ce342 VG |
2609 | rcu_read_lock(); |
2610 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2611 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2612 | continue; |
0c96d1f5 VG |
2613 | if (spp->smk_can_reuse != 1) { |
2614 | rcu_read_unlock(); | |
2615 | return; | |
2616 | } | |
c6739443 CS |
2617 | spp->smk_port = port; |
2618 | spp->smk_sock = sk; | |
2619 | spp->smk_in = ssp->smk_in; | |
2620 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2621 | spp->smk_can_reuse = 0; |
3c7ce342 | 2622 | rcu_read_unlock(); |
c6739443 CS |
2623 | return; |
2624 | } | |
3c7ce342 | 2625 | rcu_read_unlock(); |
c6739443 CS |
2626 | /* |
2627 | * A new port entry is required. | |
2628 | */ | |
2629 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2630 | if (spp == NULL) | |
2631 | return; | |
2632 | ||
2633 | spp->smk_port = port; | |
2634 | spp->smk_sock = sk; | |
2635 | spp->smk_in = ssp->smk_in; | |
2636 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2637 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2638 | spp->smk_can_reuse = 0; |
c6739443 | 2639 | |
3c7ce342 VG |
2640 | mutex_lock(&smack_ipv6_lock); |
2641 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2642 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2643 | return; |
2644 | } | |
2645 | ||
2646 | /** | |
2647 | * smk_ipv6_port_check - check Smack port access | |
2648 | * @sock: socket | |
2649 | * @address: address | |
2650 | * | |
2651 | * Create or update the port list entry | |
2652 | */ | |
6ea06247 | 2653 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2654 | int act) |
2655 | { | |
c6739443 CS |
2656 | struct smk_port_label *spp; |
2657 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2658 | struct smack_known *skp = NULL; |
2659 | unsigned short port; | |
21c7eae2 | 2660 | struct smack_known *object; |
c6739443 CS |
2661 | |
2662 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2663 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2664 | object = ssp->smk_in; |
c6739443 | 2665 | } else { |
2f823ff8 | 2666 | skp = ssp->smk_out; |
21abb1ec | 2667 | object = smack_ipv6host_label(address); |
c6739443 CS |
2668 | } |
2669 | ||
2670 | /* | |
21abb1ec | 2671 | * The other end is a single label host. |
c6739443 | 2672 | */ |
21abb1ec CS |
2673 | if (skp != NULL && object != NULL) |
2674 | return smk_ipv6_check(skp, object, address, act); | |
2675 | if (skp == NULL) | |
2676 | skp = smack_net_ambient; | |
2677 | if (object == NULL) | |
2678 | object = smack_net_ambient; | |
c6739443 CS |
2679 | |
2680 | /* | |
2681 | * It's remote, so port lookup does no good. | |
2682 | */ | |
21abb1ec CS |
2683 | if (!smk_ipv6_localhost(address)) |
2684 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2685 | |
2686 | /* | |
2687 | * It's local so the send check has to have passed. | |
2688 | */ | |
21abb1ec CS |
2689 | if (act == SMK_RECEIVING) |
2690 | return 0; | |
c6739443 | 2691 | |
21abb1ec | 2692 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2693 | rcu_read_lock(); |
2694 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2695 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2696 | continue; |
21c7eae2 | 2697 | object = spp->smk_in; |
c6739443 | 2698 | if (act == SMK_CONNECTING) |
54e70ec5 | 2699 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2700 | break; |
2701 | } | |
3c7ce342 | 2702 | rcu_read_unlock(); |
c6739443 | 2703 | |
21abb1ec | 2704 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2705 | } |
21abb1ec | 2706 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2707 | |
e114e473 CS |
2708 | /** |
2709 | * smack_inode_setsecurity - set smack xattrs | |
2710 | * @inode: the object | |
2711 | * @name: attribute name | |
2712 | * @value: attribute value | |
2713 | * @size: size of the attribute | |
2714 | * @flags: unused | |
2715 | * | |
2716 | * Sets the named attribute in the appropriate blob | |
2717 | * | |
2718 | * Returns 0 on success, or an error code | |
2719 | */ | |
2720 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2721 | const void *value, size_t size, int flags) | |
2722 | { | |
2f823ff8 | 2723 | struct smack_known *skp; |
e114e473 CS |
2724 | struct inode_smack *nsp = inode->i_security; |
2725 | struct socket_smack *ssp; | |
2726 | struct socket *sock; | |
4bc87e62 | 2727 | int rc = 0; |
e114e473 | 2728 | |
f7112e6c | 2729 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2730 | return -EINVAL; |
e114e473 | 2731 | |
2f823ff8 | 2732 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2733 | if (IS_ERR(skp)) |
2734 | return PTR_ERR(skp); | |
e114e473 CS |
2735 | |
2736 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2737 | nsp->smk_inode = skp; |
ddd29ec6 | 2738 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2739 | return 0; |
2740 | } | |
2741 | /* | |
2742 | * The rest of the Smack xattrs are only on sockets. | |
2743 | */ | |
2744 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2745 | return -EOPNOTSUPP; | |
2746 | ||
2747 | sock = SOCKET_I(inode); | |
2e1d146a | 2748 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2749 | return -EOPNOTSUPP; |
2750 | ||
2751 | ssp = sock->sk->sk_security; | |
2752 | ||
2753 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2754 | ssp->smk_in = skp; |
e114e473 | 2755 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2756 | ssp->smk_out = skp; |
c6739443 | 2757 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2758 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2759 | if (rc != 0) | |
2760 | printk(KERN_WARNING | |
2761 | "Smack: \"%s\" netlbl error %d.\n", | |
2762 | __func__, -rc); | |
2763 | } | |
e114e473 CS |
2764 | } else |
2765 | return -EOPNOTSUPP; | |
2766 | ||
21abb1ec | 2767 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2768 | if (sock->sk->sk_family == PF_INET6) |
2769 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2770 | #endif |
c6739443 | 2771 | |
e114e473 CS |
2772 | return 0; |
2773 | } | |
2774 | ||
2775 | /** | |
2776 | * smack_socket_post_create - finish socket setup | |
2777 | * @sock: the socket | |
2778 | * @family: protocol family | |
2779 | * @type: unused | |
2780 | * @protocol: unused | |
2781 | * @kern: unused | |
2782 | * | |
2783 | * Sets the netlabel information on the socket | |
2784 | * | |
2785 | * Returns 0 on success, and error code otherwise | |
2786 | */ | |
2787 | static int smack_socket_post_create(struct socket *sock, int family, | |
2788 | int type, int protocol, int kern) | |
2789 | { | |
7412301b ML |
2790 | struct socket_smack *ssp; |
2791 | ||
2792 | if (sock->sk == NULL) | |
2793 | return 0; | |
2794 | ||
2795 | /* | |
2796 | * Sockets created by kernel threads receive web label. | |
2797 | */ | |
2798 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2799 | ssp = sock->sk->sk_security; | |
2800 | ssp->smk_in = &smack_known_web; | |
2801 | ssp->smk_out = &smack_known_web; | |
2802 | } | |
2803 | ||
2804 | if (family != PF_INET) | |
e114e473 CS |
2805 | return 0; |
2806 | /* | |
2807 | * Set the outbound netlbl. | |
2808 | */ | |
6d3dc07c CS |
2809 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2810 | } | |
2811 | ||
5859cdf5 TG |
2812 | /** |
2813 | * smack_socket_socketpair - create socket pair | |
2814 | * @socka: one socket | |
2815 | * @sockb: another socket | |
2816 | * | |
2817 | * Cross reference the peer labels for SO_PEERSEC | |
2818 | * | |
2819 | * Returns 0 on success, and error code otherwise | |
2820 | */ | |
2821 | static int smack_socket_socketpair(struct socket *socka, | |
2822 | struct socket *sockb) | |
2823 | { | |
2824 | struct socket_smack *asp = socka->sk->sk_security; | |
2825 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2826 | ||
2827 | asp->smk_packet = bsp->smk_out; | |
2828 | bsp->smk_packet = asp->smk_out; | |
2829 | ||
2830 | return 0; | |
2831 | } | |
2832 | ||
21abb1ec | 2833 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2834 | /** |
2835 | * smack_socket_bind - record port binding information. | |
2836 | * @sock: the socket | |
2837 | * @address: the port address | |
2838 | * @addrlen: size of the address | |
2839 | * | |
2840 | * Records the label bound to a port. | |
2841 | * | |
2842 | * Returns 0 | |
2843 | */ | |
2844 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2845 | int addrlen) | |
2846 | { | |
2847 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2848 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2849 | return 0; |
2850 | } | |
21abb1ec | 2851 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2852 | |
6d3dc07c CS |
2853 | /** |
2854 | * smack_socket_connect - connect access check | |
2855 | * @sock: the socket | |
2856 | * @sap: the other end | |
2857 | * @addrlen: size of sap | |
2858 | * | |
2859 | * Verifies that a connection may be possible | |
2860 | * | |
2861 | * Returns 0 on success, and error code otherwise | |
2862 | */ | |
2863 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2864 | int addrlen) | |
2865 | { | |
c6739443 | 2866 | int rc = 0; |
21abb1ec CS |
2867 | #if IS_ENABLED(CONFIG_IPV6) |
2868 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2869 | #endif | |
2870 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2871 | struct smack_known *rsp; | |
da49b5da | 2872 | struct socket_smack *ssp; |
21abb1ec | 2873 | #endif |
c6739443 CS |
2874 | |
2875 | if (sock->sk == NULL) | |
6d3dc07c | 2876 | return 0; |
6d3dc07c | 2877 | |
da49b5da VG |
2878 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2879 | ssp = sock->sk->sk_security; | |
2880 | #endif | |
2881 | ||
c6739443 CS |
2882 | switch (sock->sk->sk_family) { |
2883 | case PF_INET: | |
2884 | if (addrlen < sizeof(struct sockaddr_in)) | |
2885 | return -EINVAL; | |
2886 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2887 | break; | |
2888 | case PF_INET6: | |
2889 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2890 | return -EINVAL; | |
21abb1ec CS |
2891 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2892 | rsp = smack_ipv6host_label(sip); | |
2893 | if (rsp != NULL) | |
2894 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2895 | SMK_CONNECTING); |
21abb1ec CS |
2896 | #endif |
2897 | #ifdef SMACK_IPV6_PORT_LABELING | |
2898 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2899 | #endif | |
c6739443 CS |
2900 | break; |
2901 | } | |
2902 | return rc; | |
e114e473 CS |
2903 | } |
2904 | ||
2905 | /** | |
2906 | * smack_flags_to_may - convert S_ to MAY_ values | |
2907 | * @flags: the S_ value | |
2908 | * | |
2909 | * Returns the equivalent MAY_ value | |
2910 | */ | |
2911 | static int smack_flags_to_may(int flags) | |
2912 | { | |
2913 | int may = 0; | |
2914 | ||
2915 | if (flags & S_IRUGO) | |
2916 | may |= MAY_READ; | |
2917 | if (flags & S_IWUGO) | |
2918 | may |= MAY_WRITE; | |
2919 | if (flags & S_IXUGO) | |
2920 | may |= MAY_EXEC; | |
2921 | ||
2922 | return may; | |
2923 | } | |
2924 | ||
2925 | /** | |
2926 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2927 | * @msg: the object | |
2928 | * | |
2929 | * Returns 0 | |
2930 | */ | |
2931 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2932 | { | |
2f823ff8 CS |
2933 | struct smack_known *skp = smk_of_current(); |
2934 | ||
21c7eae2 | 2935 | msg->security = skp; |
e114e473 CS |
2936 | return 0; |
2937 | } | |
2938 | ||
2939 | /** | |
2940 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2941 | * @msg: the object | |
2942 | * | |
2943 | * Clears the blob pointer | |
2944 | */ | |
2945 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2946 | { | |
2947 | msg->security = NULL; | |
2948 | } | |
2949 | ||
2950 | /** | |
0d79cbf8 EB |
2951 | * smack_of_ipc - the smack pointer for the ipc |
2952 | * @isp: the object | |
e114e473 CS |
2953 | * |
2954 | * Returns a pointer to the smack value | |
2955 | */ | |
0d79cbf8 | 2956 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 2957 | { |
0d79cbf8 | 2958 | return (struct smack_known *)isp->security; |
e114e473 CS |
2959 | } |
2960 | ||
2961 | /** | |
0d79cbf8 EB |
2962 | * smack_ipc_alloc_security - Set the security blob for ipc |
2963 | * @isp: the object | |
e114e473 CS |
2964 | * |
2965 | * Returns 0 | |
2966 | */ | |
0d79cbf8 | 2967 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 2968 | { |
2f823ff8 | 2969 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2970 | |
21c7eae2 | 2971 | isp->security = skp; |
e114e473 CS |
2972 | return 0; |
2973 | } | |
2974 | ||
2975 | /** | |
0d79cbf8 EB |
2976 | * smack_ipc_free_security - Clear the security blob for ipc |
2977 | * @isp: the object | |
e114e473 CS |
2978 | * |
2979 | * Clears the blob pointer | |
2980 | */ | |
0d79cbf8 | 2981 | static void smack_ipc_free_security(struct kern_ipc_perm *isp) |
e114e473 | 2982 | { |
e114e473 CS |
2983 | isp->security = NULL; |
2984 | } | |
2985 | ||
ecfcc53f EB |
2986 | /** |
2987 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 2988 | * @isp : the object |
ecfcc53f EB |
2989 | * @access : access requested |
2990 | * | |
2991 | * Returns 0 if current has the requested access, error code otherwise | |
2992 | */ | |
0d79cbf8 | 2993 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 2994 | { |
0d79cbf8 | 2995 | struct smack_known *ssp = smack_of_ipc(isp); |
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); | |
0d79cbf8 | 3001 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 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 | |
0d79cbf8 | 3010 | * @isp: the object |
e114e473 CS |
3011 | * @shmflg: access requested |
3012 | * | |
3013 | * Returns 0 if current has the requested access, error code otherwise | |
3014 | */ | |
0d79cbf8 | 3015 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3016 | { |
e114e473 CS |
3017 | int may; |
3018 | ||
3019 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3020 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3021 | } |
3022 | ||
3023 | /** | |
3024 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3025 | * @isp: the object |
e114e473 CS |
3026 | * @cmd: what it wants to do |
3027 | * | |
3028 | * Returns 0 if current has the requested access, error code otherwise | |
3029 | */ | |
0d79cbf8 | 3030 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3031 | { |
e114e473 CS |
3032 | int may; |
3033 | ||
3034 | switch (cmd) { | |
3035 | case IPC_STAT: | |
3036 | case SHM_STAT: | |
c21a6970 | 3037 | case SHM_STAT_ANY: |
e114e473 CS |
3038 | may = MAY_READ; |
3039 | break; | |
3040 | case IPC_SET: | |
3041 | case SHM_LOCK: | |
3042 | case SHM_UNLOCK: | |
3043 | case IPC_RMID: | |
3044 | may = MAY_READWRITE; | |
3045 | break; | |
3046 | case IPC_INFO: | |
3047 | case SHM_INFO: | |
3048 | /* | |
3049 | * System level information. | |
3050 | */ | |
3051 | return 0; | |
3052 | default: | |
3053 | return -EINVAL; | |
3054 | } | |
0d79cbf8 | 3055 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3056 | } |
3057 | ||
3058 | /** | |
3059 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3060 | * @isp: the object |
e114e473 CS |
3061 | * @shmaddr: unused |
3062 | * @shmflg: access requested | |
3063 | * | |
3064 | * Returns 0 if current has the requested access, error code otherwise | |
3065 | */ | |
0d79cbf8 | 3066 | static int smack_shm_shmat(struct kern_ipc_perm *ipc, char __user *shmaddr, |
e114e473 CS |
3067 | int shmflg) |
3068 | { | |
e114e473 CS |
3069 | int may; |
3070 | ||
3071 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3072 | return smk_curacc_shm(ipc, may); |
e114e473 CS |
3073 | } |
3074 | ||
ecfcc53f EB |
3075 | /** |
3076 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3077 | * @isp : the object |
ecfcc53f EB |
3078 | * @access : access requested |
3079 | * | |
3080 | * Returns 0 if current has the requested access, error code otherwise | |
3081 | */ | |
0d79cbf8 | 3082 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3083 | { |
0d79cbf8 | 3084 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3085 | struct smk_audit_info ad; |
d166c802 | 3086 | int rc; |
ecfcc53f EB |
3087 | |
3088 | #ifdef CONFIG_AUDIT | |
3089 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3090 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3091 | #endif |
d166c802 CS |
3092 | rc = smk_curacc(ssp, access, &ad); |
3093 | rc = smk_bu_current("sem", ssp, access, rc); | |
3094 | return rc; | |
ecfcc53f EB |
3095 | } |
3096 | ||
e114e473 CS |
3097 | /** |
3098 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3099 | * @isp: the object |
e114e473 CS |
3100 | * @semflg: access requested |
3101 | * | |
3102 | * Returns 0 if current has the requested access, error code otherwise | |
3103 | */ | |
0d79cbf8 | 3104 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3105 | { |
e114e473 CS |
3106 | int may; |
3107 | ||
3108 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3109 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3110 | } |
3111 | ||
3112 | /** | |
3113 | * smack_sem_shmctl - Smack access check for sem | |
0d79cbf8 | 3114 | * @isp: the object |
e114e473 CS |
3115 | * @cmd: what it wants to do |
3116 | * | |
3117 | * Returns 0 if current has the requested access, error code otherwise | |
3118 | */ | |
0d79cbf8 | 3119 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3120 | { |
e114e473 CS |
3121 | int may; |
3122 | ||
3123 | switch (cmd) { | |
3124 | case GETPID: | |
3125 | case GETNCNT: | |
3126 | case GETZCNT: | |
3127 | case GETVAL: | |
3128 | case GETALL: | |
3129 | case IPC_STAT: | |
3130 | case SEM_STAT: | |
a280d6dc | 3131 | case SEM_STAT_ANY: |
e114e473 CS |
3132 | may = MAY_READ; |
3133 | break; | |
3134 | case SETVAL: | |
3135 | case SETALL: | |
3136 | case IPC_RMID: | |
3137 | case IPC_SET: | |
3138 | may = MAY_READWRITE; | |
3139 | break; | |
3140 | case IPC_INFO: | |
3141 | case SEM_INFO: | |
3142 | /* | |
3143 | * System level information | |
3144 | */ | |
3145 | return 0; | |
3146 | default: | |
3147 | return -EINVAL; | |
3148 | } | |
3149 | ||
0d79cbf8 | 3150 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3151 | } |
3152 | ||
3153 | /** | |
3154 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3155 | * @isp: the object |
e114e473 CS |
3156 | * @sops: unused |
3157 | * @nsops: unused | |
3158 | * @alter: unused | |
3159 | * | |
3160 | * Treated as read and write in all cases. | |
3161 | * | |
3162 | * Returns 0 if access is allowed, error code otherwise | |
3163 | */ | |
0d79cbf8 | 3164 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3165 | unsigned nsops, int alter) |
3166 | { | |
0d79cbf8 | 3167 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3168 | } |
3169 | ||
ecfcc53f EB |
3170 | /** |
3171 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3172 | * @isp : the msq |
ecfcc53f EB |
3173 | * @access : access requested |
3174 | * | |
3175 | * return 0 if current has access, error otherwise | |
3176 | */ | |
0d79cbf8 | 3177 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3178 | { |
0d79cbf8 | 3179 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3180 | struct smk_audit_info ad; |
d166c802 | 3181 | int rc; |
ecfcc53f EB |
3182 | |
3183 | #ifdef CONFIG_AUDIT | |
3184 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3185 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3186 | #endif |
d166c802 CS |
3187 | rc = smk_curacc(msp, access, &ad); |
3188 | rc = smk_bu_current("msq", msp, access, rc); | |
3189 | return rc; | |
ecfcc53f EB |
3190 | } |
3191 | ||
e114e473 CS |
3192 | /** |
3193 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3194 | * @isp: the object |
e114e473 CS |
3195 | * @msqflg: access requested |
3196 | * | |
3197 | * Returns 0 if current has the requested access, error code otherwise | |
3198 | */ | |
0d79cbf8 | 3199 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3200 | { |
e114e473 CS |
3201 | int may; |
3202 | ||
3203 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3204 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3205 | } |
3206 | ||
3207 | /** | |
3208 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3209 | * @isp: the object |
e114e473 CS |
3210 | * @cmd: what it wants to do |
3211 | * | |
3212 | * Returns 0 if current has the requested access, error code otherwise | |
3213 | */ | |
0d79cbf8 | 3214 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3215 | { |
e114e473 CS |
3216 | int may; |
3217 | ||
3218 | switch (cmd) { | |
3219 | case IPC_STAT: | |
3220 | case MSG_STAT: | |
23c8cec8 | 3221 | case MSG_STAT_ANY: |
e114e473 CS |
3222 | may = MAY_READ; |
3223 | break; | |
3224 | case IPC_SET: | |
3225 | case IPC_RMID: | |
3226 | may = MAY_READWRITE; | |
3227 | break; | |
3228 | case IPC_INFO: | |
3229 | case MSG_INFO: | |
3230 | /* | |
3231 | * System level information | |
3232 | */ | |
3233 | return 0; | |
3234 | default: | |
3235 | return -EINVAL; | |
3236 | } | |
3237 | ||
0d79cbf8 | 3238 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3239 | } |
3240 | ||
3241 | /** | |
3242 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3243 | * @isp: the object |
e114e473 CS |
3244 | * @msg: unused |
3245 | * @msqflg: access requested | |
3246 | * | |
3247 | * Returns 0 if current has the requested access, error code otherwise | |
3248 | */ | |
0d79cbf8 | 3249 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3250 | int msqflg) |
3251 | { | |
ecfcc53f | 3252 | int may; |
e114e473 | 3253 | |
ecfcc53f | 3254 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3255 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3256 | } |
3257 | ||
3258 | /** | |
3259 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3260 | * @isp: the object |
e114e473 CS |
3261 | * @msg: unused |
3262 | * @target: unused | |
3263 | * @type: unused | |
3264 | * @mode: unused | |
3265 | * | |
3266 | * Returns 0 if current has read and write access, error code otherwise | |
3267 | */ | |
0d79cbf8 | 3268 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3269 | struct task_struct *target, long type, int mode) |
3270 | { | |
0d79cbf8 | 3271 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3272 | } |
3273 | ||
3274 | /** | |
3275 | * smack_ipc_permission - Smack access for ipc_permission() | |
3276 | * @ipp: the object permissions | |
3277 | * @flag: access requested | |
3278 | * | |
3279 | * Returns 0 if current has read and write access, error code otherwise | |
3280 | */ | |
3281 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3282 | { | |
21c7eae2 | 3283 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3284 | int may = smack_flags_to_may(flag); |
3285 | struct smk_audit_info ad; | |
d166c802 | 3286 | int rc; |
e114e473 | 3287 | |
ecfcc53f EB |
3288 | #ifdef CONFIG_AUDIT |
3289 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3290 | ad.a.u.ipc_id = ipp->id; | |
3291 | #endif | |
21c7eae2 LP |
3292 | rc = smk_curacc(iskp, may, &ad); |
3293 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3294 | return rc; |
e114e473 CS |
3295 | } |
3296 | ||
d20bdda6 AD |
3297 | /** |
3298 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3299 | * @ipp: the object permissions |
d20bdda6 AD |
3300 | * @secid: where result will be saved |
3301 | */ | |
3302 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3303 | { | |
21c7eae2 | 3304 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3305 | |
21c7eae2 | 3306 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3307 | } |
3308 | ||
e114e473 CS |
3309 | /** |
3310 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3311 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3312 | * @inode: the object |
3313 | * | |
3314 | * Set the inode's security blob if it hasn't been done already. | |
3315 | */ | |
3316 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3317 | { | |
3318 | struct super_block *sbp; | |
3319 | struct superblock_smack *sbsp; | |
3320 | struct inode_smack *isp; | |
2f823ff8 CS |
3321 | struct smack_known *skp; |
3322 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3323 | struct smack_known *final; |
5c6d1125 JS |
3324 | char trattr[TRANS_TRUE_SIZE]; |
3325 | int transflag = 0; | |
2267b13a | 3326 | int rc; |
e114e473 CS |
3327 | struct dentry *dp; |
3328 | ||
3329 | if (inode == NULL) | |
3330 | return; | |
3331 | ||
3332 | isp = inode->i_security; | |
3333 | ||
3334 | mutex_lock(&isp->smk_lock); | |
3335 | /* | |
3336 | * If the inode is already instantiated | |
3337 | * take the quick way out | |
3338 | */ | |
3339 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3340 | goto unlockandout; | |
3341 | ||
3342 | sbp = inode->i_sb; | |
3343 | sbsp = sbp->s_security; | |
3344 | /* | |
3345 | * We're going to use the superblock default label | |
3346 | * if there's no label on the file. | |
3347 | */ | |
3348 | final = sbsp->smk_default; | |
3349 | ||
e97dcb0e CS |
3350 | /* |
3351 | * If this is the root inode the superblock | |
3352 | * may be in the process of initialization. | |
3353 | * If that is the case use the root value out | |
3354 | * of the superblock. | |
3355 | */ | |
3356 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3357 | switch (sbp->s_magic) { |
3358 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3359 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3360 | /* |
3361 | * The cgroup filesystem is never mounted, | |
3362 | * so there's no opportunity to set the mount | |
3363 | * options. | |
3364 | */ | |
21c7eae2 LP |
3365 | sbsp->smk_root = &smack_known_star; |
3366 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3367 | isp->smk_inode = sbsp->smk_root; |
3368 | break; | |
3369 | case TMPFS_MAGIC: | |
3370 | /* | |
3371 | * What about shmem/tmpfs anonymous files with dentry | |
3372 | * obtained from d_alloc_pseudo()? | |
3373 | */ | |
3374 | isp->smk_inode = smk_of_current(); | |
3375 | break; | |
8da4aba5 RK |
3376 | case PIPEFS_MAGIC: |
3377 | isp->smk_inode = smk_of_current(); | |
3378 | break; | |
805b65a8 RK |
3379 | case SOCKFS_MAGIC: |
3380 | /* | |
3381 | * Socket access is controlled by the socket | |
3382 | * structures associated with the task involved. | |
3383 | */ | |
3384 | isp->smk_inode = &smack_known_star; | |
3385 | break; | |
1d8c2326 ŁS |
3386 | default: |
3387 | isp->smk_inode = sbsp->smk_root; | |
3388 | break; | |
36ea735b | 3389 | } |
e97dcb0e CS |
3390 | isp->smk_flags |= SMK_INODE_INSTANT; |
3391 | goto unlockandout; | |
3392 | } | |
3393 | ||
e114e473 CS |
3394 | /* |
3395 | * This is pretty hackish. | |
3396 | * Casey says that we shouldn't have to do | |
3397 | * file system specific code, but it does help | |
3398 | * with keeping it simple. | |
3399 | */ | |
3400 | switch (sbp->s_magic) { | |
3401 | case SMACK_MAGIC: | |
36ea735b | 3402 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3403 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3404 | /* |
25985edc | 3405 | * Casey says that it's a little embarrassing |
e114e473 CS |
3406 | * that the smack file system doesn't do |
3407 | * extended attributes. | |
36ea735b | 3408 | * |
36ea735b | 3409 | * Cgroupfs is special |
e114e473 | 3410 | */ |
21c7eae2 | 3411 | final = &smack_known_star; |
e114e473 CS |
3412 | break; |
3413 | case DEVPTS_SUPER_MAGIC: | |
3414 | /* | |
3415 | * devpts seems content with the label of the task. | |
3416 | * Programs that change smack have to treat the | |
3417 | * pty with respect. | |
3418 | */ | |
21c7eae2 | 3419 | final = ckp; |
e114e473 | 3420 | break; |
e114e473 CS |
3421 | case PROC_SUPER_MAGIC: |
3422 | /* | |
3423 | * Casey says procfs appears not to care. | |
3424 | * The superblock default suffices. | |
3425 | */ | |
3426 | break; | |
3427 | case TMPFS_MAGIC: | |
3428 | /* | |
3429 | * Device labels should come from the filesystem, | |
3430 | * but watch out, because they're volitile, | |
3431 | * getting recreated on every reboot. | |
3432 | */ | |
21c7eae2 | 3433 | final = &smack_known_star; |
e114e473 | 3434 | /* |
b1fed3ed | 3435 | * Fall through. |
e114e473 CS |
3436 | * |
3437 | * If a smack value has been set we want to use it, | |
3438 | * but since tmpfs isn't giving us the opportunity | |
3439 | * to set mount options simulate setting the | |
3440 | * superblock default. | |
3441 | */ | |
3442 | default: | |
3443 | /* | |
3444 | * This isn't an understood special case. | |
3445 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3446 | */ |
3447 | ||
3448 | /* | |
3449 | * UNIX domain sockets use lower level socket data. | |
3450 | */ | |
3451 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3452 | final = &smack_known_star; |
b4e0d5f0 CS |
3453 | break; |
3454 | } | |
3455 | /* | |
e114e473 CS |
3456 | * No xattr support means, alas, no SMACK label. |
3457 | * Use the aforeapplied default. | |
3458 | * It would be curious if the label of the task | |
3459 | * does not match that assigned. | |
3460 | */ | |
5d6c3191 AG |
3461 | if (!(inode->i_opflags & IOP_XATTR)) |
3462 | break; | |
e114e473 CS |
3463 | /* |
3464 | * Get the dentry for xattr. | |
3465 | */ | |
3e62cbb8 | 3466 | dp = dget(opt_dentry); |
2f823ff8 | 3467 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3468 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3469 | final = skp; |
2267b13a CS |
3470 | |
3471 | /* | |
3472 | * Transmuting directory | |
3473 | */ | |
3474 | if (S_ISDIR(inode->i_mode)) { | |
3475 | /* | |
3476 | * If this is a new directory and the label was | |
3477 | * transmuted when the inode was initialized | |
3478 | * set the transmute attribute on the directory | |
3479 | * and mark the inode. | |
3480 | * | |
3481 | * If there is a transmute attribute on the | |
3482 | * directory mark the inode. | |
3483 | */ | |
3484 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3485 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
5d6c3191 | 3486 | rc = __vfs_setxattr(dp, inode, |
5c6d1125 | 3487 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3488 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3489 | 0); | |
3490 | } else { | |
5d6c3191 | 3491 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3492 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3493 | TRANS_TRUE_SIZE); | |
3494 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3495 | TRANS_TRUE_SIZE) != 0) | |
3496 | rc = -EINVAL; | |
5c6d1125 | 3497 | } |
2267b13a CS |
3498 | if (rc >= 0) |
3499 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3500 | } |
809c02e0 SF |
3501 | /* |
3502 | * Don't let the exec or mmap label be "*" or "@". | |
3503 | */ | |
3504 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3505 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3506 | skp == &smack_known_web) | |
3507 | skp = NULL; | |
3508 | isp->smk_task = skp; | |
e774ad68 | 3509 | |
19760ad0 | 3510 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3511 | if (IS_ERR(skp) || skp == &smack_known_star || |
3512 | skp == &smack_known_web) | |
19760ad0 CS |
3513 | skp = NULL; |
3514 | isp->smk_mmap = skp; | |
676dac4b | 3515 | |
e114e473 CS |
3516 | dput(dp); |
3517 | break; | |
3518 | } | |
3519 | ||
3520 | if (final == NULL) | |
21c7eae2 | 3521 | isp->smk_inode = ckp; |
e114e473 CS |
3522 | else |
3523 | isp->smk_inode = final; | |
3524 | ||
5c6d1125 | 3525 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3526 | |
3527 | unlockandout: | |
3528 | mutex_unlock(&isp->smk_lock); | |
3529 | return; | |
3530 | } | |
3531 | ||
3532 | /** | |
3533 | * smack_getprocattr - Smack process attribute access | |
3534 | * @p: the object task | |
3535 | * @name: the name of the attribute in /proc/.../attr | |
3536 | * @value: where to put the result | |
3537 | * | |
3538 | * Places a copy of the task Smack into value | |
3539 | * | |
3540 | * Returns the length of the smack label or an error code | |
3541 | */ | |
3542 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3543 | { | |
6d1cff2a | 3544 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3545 | char *cp; |
3546 | int slen; | |
3547 | ||
3548 | if (strcmp(name, "current") != 0) | |
3549 | return -EINVAL; | |
3550 | ||
2f823ff8 | 3551 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3552 | if (cp == NULL) |
3553 | return -ENOMEM; | |
3554 | ||
3555 | slen = strlen(cp); | |
3556 | *value = cp; | |
3557 | return slen; | |
3558 | } | |
3559 | ||
3560 | /** | |
3561 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3562 | * @name: the name of the attribute in /proc/.../attr |
3563 | * @value: the value to set | |
3564 | * @size: the size of the value | |
3565 | * | |
3566 | * Sets the Smack value of the task. Only setting self | |
3567 | * is permitted and only with privilege | |
3568 | * | |
3569 | * Returns the length of the smack label or an error code | |
3570 | */ | |
b21507e2 | 3571 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3572 | { |
38416e53 | 3573 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3574 | struct cred *new; |
2f823ff8 | 3575 | struct smack_known *skp; |
38416e53 ZJ |
3576 | struct smack_known_list_elem *sklep; |
3577 | int rc; | |
e114e473 | 3578 | |
38416e53 | 3579 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3580 | return -EPERM; |
3581 | ||
f7112e6c | 3582 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3583 | return -EINVAL; |
3584 | ||
3585 | if (strcmp(name, "current") != 0) | |
3586 | return -EINVAL; | |
3587 | ||
2f823ff8 | 3588 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3589 | if (IS_ERR(skp)) |
3590 | return PTR_ERR(skp); | |
e114e473 | 3591 | |
6d3dc07c | 3592 | /* |
7128ea15 HS |
3593 | * No process is ever allowed the web ("@") label |
3594 | * and the star ("*") label. | |
6d3dc07c | 3595 | */ |
7128ea15 HS |
3596 | if (skp == &smack_known_web || skp == &smack_known_star) |
3597 | return -EINVAL; | |
6d3dc07c | 3598 | |
38416e53 ZJ |
3599 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3600 | rc = -EPERM; | |
3601 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3602 | if (sklep->smk_label == skp) { | |
3603 | rc = 0; | |
3604 | break; | |
3605 | } | |
3606 | if (rc) | |
3607 | return rc; | |
3608 | } | |
3609 | ||
d84f4f99 | 3610 | new = prepare_creds(); |
6d3dc07c | 3611 | if (new == NULL) |
d84f4f99 | 3612 | return -ENOMEM; |
7898e1f8 | 3613 | |
46a2f3b9 | 3614 | tsp = new->security; |
2f823ff8 | 3615 | tsp->smk_task = skp; |
38416e53 ZJ |
3616 | /* |
3617 | * process can change its label only once | |
3618 | */ | |
3619 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3620 | |
d84f4f99 | 3621 | commit_creds(new); |
e114e473 CS |
3622 | return size; |
3623 | } | |
3624 | ||
3625 | /** | |
3626 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3627 | * @sock: one sock |
3628 | * @other: the other sock | |
e114e473 CS |
3629 | * @newsk: unused |
3630 | * | |
3631 | * Return 0 if a subject with the smack of sock could access | |
3632 | * an object with the smack of other, otherwise an error code | |
3633 | */ | |
3610cda5 DM |
3634 | static int smack_unix_stream_connect(struct sock *sock, |
3635 | struct sock *other, struct sock *newsk) | |
e114e473 | 3636 | { |
2f823ff8 | 3637 | struct smack_known *skp; |
54e70ec5 | 3638 | struct smack_known *okp; |
d2e7ad19 JM |
3639 | struct socket_smack *ssp = sock->sk_security; |
3640 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3641 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3642 | struct smk_audit_info ad; |
b4e0d5f0 | 3643 | int rc = 0; |
923e9a13 KC |
3644 | #ifdef CONFIG_AUDIT |
3645 | struct lsm_network_audit net; | |
923e9a13 | 3646 | #endif |
b4e0d5f0 | 3647 | |
2f823ff8 CS |
3648 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3649 | skp = ssp->smk_out; | |
96be7b54 | 3650 | okp = osp->smk_in; |
54e70ec5 CS |
3651 | #ifdef CONFIG_AUDIT |
3652 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3653 | smk_ad_setfield_u_net_sk(&ad, other); | |
3654 | #endif | |
21c7eae2 LP |
3655 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3656 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3657 | if (rc == 0) { |
96be7b54 ZJ |
3658 | okp = osp->smk_out; |
3659 | skp = ssp->smk_in; | |
138a868f | 3660 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3661 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3662 | MAY_WRITE, rc); |
3663 | } | |
2f823ff8 | 3664 | } |
b4e0d5f0 | 3665 | |
975d5e55 CS |
3666 | /* |
3667 | * Cross reference the peer labels for SO_PEERSEC. | |
3668 | */ | |
3669 | if (rc == 0) { | |
54e70ec5 CS |
3670 | nsp->smk_packet = ssp->smk_out; |
3671 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3672 | } |
3673 | ||
b4e0d5f0 | 3674 | return rc; |
e114e473 CS |
3675 | } |
3676 | ||
3677 | /** | |
3678 | * smack_unix_may_send - Smack access on UDS | |
3679 | * @sock: one socket | |
3680 | * @other: the other socket | |
3681 | * | |
3682 | * Return 0 if a subject with the smack of sock could access | |
3683 | * an object with the smack of other, otherwise an error code | |
3684 | */ | |
3685 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3686 | { | |
b4e0d5f0 CS |
3687 | struct socket_smack *ssp = sock->sk->sk_security; |
3688 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3689 | struct smk_audit_info ad; |
d166c802 | 3690 | int rc; |
e114e473 | 3691 | |
923e9a13 KC |
3692 | #ifdef CONFIG_AUDIT |
3693 | struct lsm_network_audit net; | |
3694 | ||
48c62af6 | 3695 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3696 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3697 | #endif |
b4e0d5f0 | 3698 | |
2f823ff8 CS |
3699 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3700 | return 0; | |
b4e0d5f0 | 3701 | |
21c7eae2 LP |
3702 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3703 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3704 | return rc; |
e114e473 CS |
3705 | } |
3706 | ||
6d3dc07c CS |
3707 | /** |
3708 | * smack_socket_sendmsg - Smack check based on destination host | |
3709 | * @sock: the socket | |
251a2a95 | 3710 | * @msg: the message |
6d3dc07c CS |
3711 | * @size: the size of the message |
3712 | * | |
c6739443 CS |
3713 | * Return 0 if the current subject can write to the destination host. |
3714 | * For IPv4 this is only a question if the destination is a single label host. | |
3715 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3716 | */ |
3717 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3718 | int size) | |
3719 | { | |
3720 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3721 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3722 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3723 | #endif |
3724 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3725 | struct socket_smack *ssp = sock->sk->sk_security; | |
3726 | struct smack_known *rsp; | |
3727 | #endif | |
c6739443 | 3728 | int rc = 0; |
6d3dc07c CS |
3729 | |
3730 | /* | |
3731 | * Perfectly reasonable for this to be NULL | |
3732 | */ | |
c6739443 | 3733 | if (sip == NULL) |
6d3dc07c CS |
3734 | return 0; |
3735 | ||
81bd0d56 | 3736 | switch (sock->sk->sk_family) { |
c6739443 CS |
3737 | case AF_INET: |
3738 | rc = smack_netlabel_send(sock->sk, sip); | |
3739 | break; | |
3740 | case AF_INET6: | |
21abb1ec CS |
3741 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3742 | rsp = smack_ipv6host_label(sap); | |
3743 | if (rsp != NULL) | |
3744 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3745 | SMK_CONNECTING); | |
3746 | #endif | |
3747 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3748 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3749 | #endif |
c6739443 CS |
3750 | break; |
3751 | } | |
3752 | return rc; | |
6d3dc07c CS |
3753 | } |
3754 | ||
e114e473 | 3755 | /** |
251a2a95 | 3756 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3757 | * @sap: netlabel secattr |
272cd7a8 | 3758 | * @ssp: socket security information |
e114e473 | 3759 | * |
2f823ff8 | 3760 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3761 | */ |
2f823ff8 CS |
3762 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3763 | struct socket_smack *ssp) | |
e114e473 | 3764 | { |
2f823ff8 | 3765 | struct smack_known *skp; |
f7112e6c | 3766 | int found = 0; |
677264e8 CS |
3767 | int acat; |
3768 | int kcat; | |
e114e473 | 3769 | |
6d3dc07c | 3770 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3771 | /* |
6d3dc07c | 3772 | * Looks like a CIPSO packet. |
e114e473 CS |
3773 | * If there are flags but no level netlabel isn't |
3774 | * behaving the way we expect it to. | |
3775 | * | |
f7112e6c | 3776 | * Look it up in the label table |
e114e473 CS |
3777 | * Without guidance regarding the smack value |
3778 | * for the packet fall back on the network | |
3779 | * ambient value. | |
3780 | */ | |
f7112e6c | 3781 | rcu_read_lock(); |
348dc288 | 3782 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3783 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3784 | continue; |
677264e8 CS |
3785 | /* |
3786 | * Compare the catsets. Use the netlbl APIs. | |
3787 | */ | |
3788 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3789 | if ((skp->smk_netlabel.flags & | |
3790 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3791 | found = 1; | |
3792 | break; | |
3793 | } | |
3794 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3795 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3796 | acat + 1); | |
3797 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3798 | skp->smk_netlabel.attr.mls.cat, |
3799 | kcat + 1); | |
3800 | if (acat < 0 || kcat < 0) | |
3801 | break; | |
3802 | } | |
3803 | if (acat == kcat) { | |
3804 | found = 1; | |
3805 | break; | |
3806 | } | |
6d3dc07c | 3807 | } |
f7112e6c CS |
3808 | rcu_read_unlock(); |
3809 | ||
3810 | if (found) | |
2f823ff8 | 3811 | return skp; |
f7112e6c | 3812 | |
54e70ec5 | 3813 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3814 | return &smack_known_web; |
3815 | return &smack_known_star; | |
e114e473 | 3816 | } |
152f91d4 | 3817 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) |
6d3dc07c CS |
3818 | /* |
3819 | * Looks like a fallback, which gives us a secid. | |
3820 | */ | |
152f91d4 | 3821 | return smack_from_secid(sap->attr.secid); |
e114e473 | 3822 | /* |
6d3dc07c CS |
3823 | * Without guidance regarding the smack value |
3824 | * for the packet fall back on the network | |
3825 | * ambient value. | |
e114e473 | 3826 | */ |
272cd7a8 | 3827 | return smack_net_ambient; |
e114e473 CS |
3828 | } |
3829 | ||
69f287ae | 3830 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3831 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3832 | { |
c6739443 CS |
3833 | u8 nexthdr; |
3834 | int offset; | |
3835 | int proto = -EINVAL; | |
3836 | struct ipv6hdr _ipv6h; | |
3837 | struct ipv6hdr *ip6; | |
3838 | __be16 frag_off; | |
3839 | struct tcphdr _tcph, *th; | |
3840 | struct udphdr _udph, *uh; | |
3841 | struct dccp_hdr _dccph, *dh; | |
3842 | ||
3843 | sip->sin6_port = 0; | |
3844 | ||
3845 | offset = skb_network_offset(skb); | |
3846 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3847 | if (ip6 == NULL) | |
3848 | return -EINVAL; | |
3849 | sip->sin6_addr = ip6->saddr; | |
3850 | ||
3851 | nexthdr = ip6->nexthdr; | |
3852 | offset += sizeof(_ipv6h); | |
3853 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3854 | if (offset < 0) | |
3855 | return -EINVAL; | |
3856 | ||
3857 | proto = nexthdr; | |
3858 | switch (proto) { | |
3859 | case IPPROTO_TCP: | |
3860 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3861 | if (th != NULL) | |
3862 | sip->sin6_port = th->source; | |
3863 | break; | |
3864 | case IPPROTO_UDP: | |
a07ef951 | 3865 | case IPPROTO_UDPLITE: |
c6739443 CS |
3866 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3867 | if (uh != NULL) | |
3868 | sip->sin6_port = uh->source; | |
3869 | break; | |
3870 | case IPPROTO_DCCP: | |
3871 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3872 | if (dh != NULL) | |
3873 | sip->sin6_port = dh->dccph_sport; | |
3874 | break; | |
3875 | } | |
3876 | return proto; | |
3877 | } | |
69f287ae | 3878 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3879 | |
e114e473 CS |
3880 | /** |
3881 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3882 | * @sk: socket | |
3883 | * @skb: packet | |
3884 | * | |
3885 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3886 | */ | |
3887 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3888 | { | |
3889 | struct netlbl_lsm_secattr secattr; | |
3890 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3891 | struct smack_known *skp = NULL; |
c6739443 | 3892 | int rc = 0; |
ecfcc53f | 3893 | struct smk_audit_info ad; |
129a9989 | 3894 | u16 family = sk->sk_family; |
923e9a13 | 3895 | #ifdef CONFIG_AUDIT |
48c62af6 | 3896 | struct lsm_network_audit net; |
923e9a13 | 3897 | #endif |
69f287ae CS |
3898 | #if IS_ENABLED(CONFIG_IPV6) |
3899 | struct sockaddr_in6 sadd; | |
3900 | int proto; | |
129a9989 PS |
3901 | |
3902 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3903 | family = PF_INET; | |
69f287ae CS |
3904 | #endif /* CONFIG_IPV6 */ |
3905 | ||
129a9989 | 3906 | switch (family) { |
c6739443 | 3907 | case PF_INET: |
69f287ae CS |
3908 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3909 | /* | |
3910 | * If there is a secmark use it rather than the CIPSO label. | |
3911 | * If there is no secmark fall back to CIPSO. | |
3912 | * The secmark is assumed to reflect policy better. | |
3913 | */ | |
3914 | if (skb && skb->secmark != 0) { | |
3915 | skp = smack_from_secid(skb->secmark); | |
3916 | goto access_check; | |
3917 | } | |
3918 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3919 | /* |
3920 | * Translate what netlabel gave us. | |
3921 | */ | |
3922 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3923 | |
129a9989 | 3924 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
c6739443 | 3925 | if (rc == 0) |
2f823ff8 | 3926 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3927 | else |
2f823ff8 | 3928 | skp = smack_net_ambient; |
6d3dc07c | 3929 | |
c6739443 | 3930 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3931 | |
69f287ae CS |
3932 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3933 | access_check: | |
3934 | #endif | |
ecfcc53f | 3935 | #ifdef CONFIG_AUDIT |
c6739443 | 3936 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 3937 | ad.a.u.net->family = family; |
c6739443 CS |
3938 | ad.a.u.net->netif = skb->skb_iif; |
3939 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3940 | #endif |
c6739443 CS |
3941 | /* |
3942 | * Receiving a packet requires that the other end | |
3943 | * be able to write here. Read access is not required. | |
3944 | * This is the simplist possible security model | |
3945 | * for networking. | |
3946 | */ | |
21c7eae2 LP |
3947 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3948 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3949 | MAY_WRITE, rc); |
c6739443 | 3950 | if (rc != 0) |
129a9989 | 3951 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 3952 | break; |
69f287ae | 3953 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3954 | case PF_INET6: |
69f287ae | 3955 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
3956 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
3957 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 3958 | break; |
21abb1ec | 3959 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
3960 | if (skb && skb->secmark != 0) |
3961 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 3962 | else |
21abb1ec CS |
3963 | skp = smack_ipv6host_label(&sadd); |
3964 | if (skp == NULL) | |
69f287ae CS |
3965 | skp = smack_net_ambient; |
3966 | #ifdef CONFIG_AUDIT | |
3967 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 3968 | ad.a.u.net->family = family; |
69f287ae CS |
3969 | ad.a.u.net->netif = skb->skb_iif; |
3970 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
3971 | #endif /* CONFIG_AUDIT */ | |
3972 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
3973 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
3974 | MAY_WRITE, rc); | |
21abb1ec CS |
3975 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
3976 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 3977 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 3978 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
3979 | if (rc != 0) |
3980 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
3981 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 3982 | break; |
69f287ae | 3983 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3984 | } |
69f287ae | 3985 | |
a8134296 | 3986 | return rc; |
e114e473 CS |
3987 | } |
3988 | ||
3989 | /** | |
3990 | * smack_socket_getpeersec_stream - pull in packet label | |
3991 | * @sock: the socket | |
3992 | * @optval: user's destination | |
3993 | * @optlen: size thereof | |
251a2a95 | 3994 | * @len: max thereof |
e114e473 CS |
3995 | * |
3996 | * returns zero on success, an error code otherwise | |
3997 | */ | |
3998 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3999 | char __user *optval, | |
4000 | int __user *optlen, unsigned len) | |
4001 | { | |
4002 | struct socket_smack *ssp; | |
272cd7a8 CS |
4003 | char *rcp = ""; |
4004 | int slen = 1; | |
e114e473 CS |
4005 | int rc = 0; |
4006 | ||
4007 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4008 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4009 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4010 | slen = strlen(rcp) + 1; |
4011 | } | |
e114e473 CS |
4012 | |
4013 | if (slen > len) | |
4014 | rc = -ERANGE; | |
272cd7a8 | 4015 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4016 | rc = -EFAULT; |
4017 | ||
4018 | if (put_user(slen, optlen) != 0) | |
4019 | rc = -EFAULT; | |
4020 | ||
4021 | return rc; | |
4022 | } | |
4023 | ||
4024 | ||
4025 | /** | |
4026 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4027 | * @sock: the peer socket |
e114e473 CS |
4028 | * @skb: packet data |
4029 | * @secid: pointer to where to put the secid of the packet | |
4030 | * | |
4031 | * Sets the netlabel socket state on sk from parent | |
4032 | */ | |
4033 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4034 | struct sk_buff *skb, u32 *secid) | |
4035 | ||
4036 | { | |
4037 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4038 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4039 | struct smack_known *skp; |
b4e0d5f0 CS |
4040 | int family = PF_UNSPEC; |
4041 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4042 | int rc; |
4043 | ||
b4e0d5f0 CS |
4044 | if (skb != NULL) { |
4045 | if (skb->protocol == htons(ETH_P_IP)) | |
4046 | family = PF_INET; | |
69f287ae | 4047 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4048 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4049 | family = PF_INET6; | |
69f287ae | 4050 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4051 | } |
b4e0d5f0 CS |
4052 | if (family == PF_UNSPEC && sock != NULL) |
4053 | family = sock->sk->sk_family; | |
e114e473 | 4054 | |
69f287ae CS |
4055 | switch (family) { |
4056 | case PF_UNIX: | |
272cd7a8 | 4057 | ssp = sock->sk->sk_security; |
2f823ff8 | 4058 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4059 | break; |
4060 | case PF_INET: | |
4061 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4062 | s = skb->secmark; | |
4063 | if (s != 0) | |
4064 | break; | |
4065 | #endif | |
b4e0d5f0 CS |
4066 | /* |
4067 | * Translate what netlabel gave us. | |
4068 | */ | |
272cd7a8 CS |
4069 | if (sock != NULL && sock->sk != NULL) |
4070 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4071 | netlbl_secattr_init(&secattr); |
4072 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4073 | if (rc == 0) { | |
2f823ff8 CS |
4074 | skp = smack_from_secattr(&secattr, ssp); |
4075 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4076 | } |
4077 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4078 | break; |
69f287ae | 4079 | case PF_INET6: |
21abb1ec | 4080 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4081 | s = skb->secmark; |
21abb1ec | 4082 | #endif |
69f287ae | 4083 | break; |
b4e0d5f0 CS |
4084 | } |
4085 | *secid = s; | |
e114e473 CS |
4086 | if (s == 0) |
4087 | return -EINVAL; | |
e114e473 CS |
4088 | return 0; |
4089 | } | |
4090 | ||
4091 | /** | |
07feee8f PM |
4092 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4093 | * @sk: child sock | |
4094 | * @parent: parent socket | |
e114e473 | 4095 | * |
07feee8f PM |
4096 | * Set the smk_{in,out} state of an existing sock based on the process that |
4097 | * is creating the new socket. | |
e114e473 CS |
4098 | */ |
4099 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4100 | { | |
4101 | struct socket_smack *ssp; | |
2f823ff8 | 4102 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4103 | |
07feee8f PM |
4104 | if (sk == NULL || |
4105 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4106 | return; |
4107 | ||
4108 | ssp = sk->sk_security; | |
54e70ec5 | 4109 | ssp->smk_in = skp; |
2f823ff8 | 4110 | ssp->smk_out = skp; |
07feee8f | 4111 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4112 | } |
4113 | ||
4114 | /** | |
4115 | * smack_inet_conn_request - Smack access check on connect | |
4116 | * @sk: socket involved | |
4117 | * @skb: packet | |
4118 | * @req: unused | |
4119 | * | |
4120 | * Returns 0 if a task with the packet label could write to | |
4121 | * the socket, otherwise an error code | |
4122 | */ | |
4123 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4124 | struct request_sock *req) | |
4125 | { | |
07feee8f | 4126 | u16 family = sk->sk_family; |
f7112e6c | 4127 | struct smack_known *skp; |
e114e473 | 4128 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4129 | struct netlbl_lsm_secattr secattr; |
4130 | struct sockaddr_in addr; | |
4131 | struct iphdr *hdr; | |
21c7eae2 | 4132 | struct smack_known *hskp; |
e114e473 | 4133 | int rc; |
ecfcc53f | 4134 | struct smk_audit_info ad; |
923e9a13 | 4135 | #ifdef CONFIG_AUDIT |
48c62af6 | 4136 | struct lsm_network_audit net; |
923e9a13 | 4137 | #endif |
e114e473 | 4138 | |
69f287ae | 4139 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4140 | if (family == PF_INET6) { |
4141 | /* | |
4142 | * Handle mapped IPv4 packets arriving | |
4143 | * via IPv6 sockets. Don't set up netlabel | |
4144 | * processing on IPv6. | |
4145 | */ | |
4146 | if (skb->protocol == htons(ETH_P_IP)) | |
4147 | family = PF_INET; | |
4148 | else | |
4149 | return 0; | |
4150 | } | |
69f287ae | 4151 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4152 | |
7f368ad3 CS |
4153 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4154 | /* | |
4155 | * If there is a secmark use it rather than the CIPSO label. | |
4156 | * If there is no secmark fall back to CIPSO. | |
4157 | * The secmark is assumed to reflect policy better. | |
4158 | */ | |
4159 | if (skb && skb->secmark != 0) { | |
4160 | skp = smack_from_secid(skb->secmark); | |
4161 | goto access_check; | |
4162 | } | |
4163 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4164 | ||
07feee8f PM |
4165 | netlbl_secattr_init(&secattr); |
4166 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4167 | if (rc == 0) |
2f823ff8 | 4168 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4169 | else |
2f823ff8 | 4170 | skp = &smack_known_huh; |
07feee8f PM |
4171 | netlbl_secattr_destroy(&secattr); |
4172 | ||
7f368ad3 CS |
4173 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4174 | access_check: | |
4175 | #endif | |
4176 | ||
ecfcc53f | 4177 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4178 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4179 | ad.a.u.net->family = family; | |
4180 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4181 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4182 | #endif | |
e114e473 | 4183 | /* |
07feee8f PM |
4184 | * Receiving a packet requires that the other end be able to write |
4185 | * here. Read access is not required. | |
e114e473 | 4186 | */ |
21c7eae2 LP |
4187 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4188 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4189 | if (rc != 0) |
4190 | return rc; | |
4191 | ||
4192 | /* | |
4193 | * Save the peer's label in the request_sock so we can later setup | |
4194 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4195 | */ | |
2f823ff8 | 4196 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4197 | |
4198 | /* | |
4199 | * We need to decide if we want to label the incoming connection here | |
4200 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4201 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4202 | */ |
4203 | hdr = ip_hdr(skb); | |
4204 | addr.sin_addr.s_addr = hdr->saddr; | |
4205 | rcu_read_lock(); | |
21abb1ec | 4206 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4207 | rcu_read_unlock(); |
4208 | ||
21c7eae2 | 4209 | if (hskp == NULL) |
f7112e6c | 4210 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4211 | else |
07feee8f | 4212 | netlbl_req_delattr(req); |
e114e473 CS |
4213 | |
4214 | return rc; | |
4215 | } | |
4216 | ||
07feee8f PM |
4217 | /** |
4218 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4219 | * @sk: the new socket | |
4220 | * @req: the connection's request_sock | |
4221 | * | |
4222 | * Transfer the connection's peer label to the newly created socket. | |
4223 | */ | |
4224 | static void smack_inet_csk_clone(struct sock *sk, | |
4225 | const struct request_sock *req) | |
4226 | { | |
4227 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4228 | struct smack_known *skp; |
07feee8f | 4229 | |
2f823ff8 CS |
4230 | if (req->peer_secid != 0) { |
4231 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4232 | ssp->smk_packet = skp; |
2f823ff8 | 4233 | } else |
272cd7a8 | 4234 | ssp->smk_packet = NULL; |
07feee8f PM |
4235 | } |
4236 | ||
e114e473 CS |
4237 | /* |
4238 | * Key management security hooks | |
4239 | * | |
4240 | * Casey has not tested key support very heavily. | |
4241 | * The permission check is most likely too restrictive. | |
4242 | * If you care about keys please have a look. | |
4243 | */ | |
4244 | #ifdef CONFIG_KEYS | |
4245 | ||
4246 | /** | |
4247 | * smack_key_alloc - Set the key security blob | |
4248 | * @key: object | |
d84f4f99 | 4249 | * @cred: the credentials to use |
e114e473 CS |
4250 | * @flags: unused |
4251 | * | |
4252 | * No allocation required | |
4253 | * | |
4254 | * Returns 0 | |
4255 | */ | |
d84f4f99 | 4256 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4257 | unsigned long flags) |
4258 | { | |
2f823ff8 CS |
4259 | struct smack_known *skp = smk_of_task(cred->security); |
4260 | ||
21c7eae2 | 4261 | key->security = skp; |
e114e473 CS |
4262 | return 0; |
4263 | } | |
4264 | ||
4265 | /** | |
4266 | * smack_key_free - Clear the key security blob | |
4267 | * @key: the object | |
4268 | * | |
4269 | * Clear the blob pointer | |
4270 | */ | |
4271 | static void smack_key_free(struct key *key) | |
4272 | { | |
4273 | key->security = NULL; | |
4274 | } | |
4275 | ||
1a28979b | 4276 | /** |
e114e473 CS |
4277 | * smack_key_permission - Smack access on a key |
4278 | * @key_ref: gets to the object | |
d84f4f99 | 4279 | * @cred: the credentials to use |
1a28979b | 4280 | * @perm: requested key permissions |
e114e473 CS |
4281 | * |
4282 | * Return 0 if the task has read and write to the object, | |
4283 | * an error code otherwise | |
4284 | */ | |
4285 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4286 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4287 | { |
4288 | struct key *keyp; | |
ecfcc53f | 4289 | struct smk_audit_info ad; |
2f823ff8 | 4290 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4291 | int request = 0; |
d166c802 | 4292 | int rc; |
e114e473 CS |
4293 | |
4294 | keyp = key_ref_to_ptr(key_ref); | |
4295 | if (keyp == NULL) | |
4296 | return -EINVAL; | |
4297 | /* | |
4298 | * If the key hasn't been initialized give it access so that | |
4299 | * it may do so. | |
4300 | */ | |
4301 | if (keyp->security == NULL) | |
4302 | return 0; | |
4303 | /* | |
4304 | * This should not occur | |
4305 | */ | |
2f823ff8 | 4306 | if (tkp == NULL) |
e114e473 | 4307 | return -EACCES; |
d19dfe58 CS |
4308 | |
4309 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) | |
4310 | return 0; | |
4311 | ||
ecfcc53f EB |
4312 | #ifdef CONFIG_AUDIT |
4313 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4314 | ad.a.u.key_struct.key = keyp->serial; | |
4315 | ad.a.u.key_struct.key_desc = keyp->description; | |
4316 | #endif | |
fffea214 DK |
4317 | if (perm & KEY_NEED_READ) |
4318 | request = MAY_READ; | |
4319 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4320 | request = MAY_WRITE; | |
d166c802 CS |
4321 | rc = smk_access(tkp, keyp->security, request, &ad); |
4322 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4323 | return rc; | |
e114e473 | 4324 | } |
7fc5f36e JB |
4325 | |
4326 | /* | |
4327 | * smack_key_getsecurity - Smack label tagging the key | |
4328 | * @key points to the key to be queried | |
4329 | * @_buffer points to a pointer that should be set to point to the | |
4330 | * resulting string (if no label or an error occurs). | |
4331 | * Return the length of the string (including terminating NUL) or -ve if | |
4332 | * an error. | |
4333 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4334 | */ | |
4335 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4336 | { | |
4337 | struct smack_known *skp = key->security; | |
4338 | size_t length; | |
4339 | char *copy; | |
4340 | ||
4341 | if (key->security == NULL) { | |
4342 | *_buffer = NULL; | |
4343 | return 0; | |
4344 | } | |
4345 | ||
4346 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4347 | if (copy == NULL) | |
4348 | return -ENOMEM; | |
4349 | length = strlen(copy) + 1; | |
4350 | ||
4351 | *_buffer = copy; | |
4352 | return length; | |
4353 | } | |
4354 | ||
e114e473 CS |
4355 | #endif /* CONFIG_KEYS */ |
4356 | ||
d20bdda6 AD |
4357 | /* |
4358 | * Smack Audit hooks | |
4359 | * | |
4360 | * Audit requires a unique representation of each Smack specific | |
4361 | * rule. This unique representation is used to distinguish the | |
4362 | * object to be audited from remaining kernel objects and also | |
4363 | * works as a glue between the audit hooks. | |
4364 | * | |
4365 | * Since repository entries are added but never deleted, we'll use | |
4366 | * the smack_known label address related to the given audit rule as | |
4367 | * the needed unique representation. This also better fits the smack | |
4368 | * model where nearly everything is a label. | |
4369 | */ | |
4370 | #ifdef CONFIG_AUDIT | |
4371 | ||
4372 | /** | |
4373 | * smack_audit_rule_init - Initialize a smack audit rule | |
4374 | * @field: audit rule fields given from user-space (audit.h) | |
4375 | * @op: required testing operator (=, !=, >, <, ...) | |
4376 | * @rulestr: smack label to be audited | |
4377 | * @vrule: pointer to save our own audit rule representation | |
4378 | * | |
4379 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4380 | * The label to be audited is created if necessay. | |
4381 | */ | |
4382 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4383 | { | |
21c7eae2 | 4384 | struct smack_known *skp; |
d20bdda6 AD |
4385 | char **rule = (char **)vrule; |
4386 | *rule = NULL; | |
4387 | ||
4388 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4389 | return -EINVAL; | |
4390 | ||
5af75d8d | 4391 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4392 | return -EINVAL; |
4393 | ||
21c7eae2 | 4394 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4395 | if (IS_ERR(skp)) |
4396 | return PTR_ERR(skp); | |
4397 | ||
4398 | *rule = skp->smk_known; | |
d20bdda6 AD |
4399 | |
4400 | return 0; | |
4401 | } | |
4402 | ||
4403 | /** | |
4404 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4405 | * @krule: rule of interest, in Audit kernel representation format | |
4406 | * | |
4407 | * This is used to filter Smack rules from remaining Audit ones. | |
4408 | * If it's proved that this rule belongs to us, the | |
4409 | * audit_rule_match hook will be called to do the final judgement. | |
4410 | */ | |
4411 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4412 | { | |
4413 | struct audit_field *f; | |
4414 | int i; | |
4415 | ||
4416 | for (i = 0; i < krule->field_count; i++) { | |
4417 | f = &krule->fields[i]; | |
4418 | ||
4419 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4420 | return 1; | |
4421 | } | |
4422 | ||
4423 | return 0; | |
4424 | } | |
4425 | ||
4426 | /** | |
4427 | * smack_audit_rule_match - Audit given object ? | |
4428 | * @secid: security id for identifying the object to test | |
4429 | * @field: audit rule flags given from user-space | |
4430 | * @op: required testing operator | |
4431 | * @vrule: smack internal rule presentation | |
4432 | * @actx: audit context associated with the check | |
4433 | * | |
4434 | * The core Audit hook. It's used to take the decision of | |
4435 | * whether to audit or not to audit a given object. | |
4436 | */ | |
4437 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4438 | struct audit_context *actx) | |
4439 | { | |
2f823ff8 | 4440 | struct smack_known *skp; |
d20bdda6 AD |
4441 | char *rule = vrule; |
4442 | ||
4eb0f4ab RGB |
4443 | if (unlikely(!rule)) { |
4444 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4445 | return -ENOENT; |
4446 | } | |
4447 | ||
4448 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4449 | return 0; | |
4450 | ||
2f823ff8 | 4451 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4452 | |
4453 | /* | |
4454 | * No need to do string comparisons. If a match occurs, | |
4455 | * both pointers will point to the same smack_known | |
4456 | * label. | |
4457 | */ | |
5af75d8d | 4458 | if (op == Audit_equal) |
2f823ff8 | 4459 | return (rule == skp->smk_known); |
5af75d8d | 4460 | if (op == Audit_not_equal) |
2f823ff8 | 4461 | return (rule != skp->smk_known); |
d20bdda6 AD |
4462 | |
4463 | return 0; | |
4464 | } | |
4465 | ||
491a0b08 CS |
4466 | /* |
4467 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4468 | * No memory was allocated. |
4469 | */ | |
d20bdda6 AD |
4470 | |
4471 | #endif /* CONFIG_AUDIT */ | |
4472 | ||
746df9b5 DQ |
4473 | /** |
4474 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4475 | * @name: Full xattr name to check. | |
4476 | */ | |
4477 | static int smack_ismaclabel(const char *name) | |
4478 | { | |
4479 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4480 | } | |
4481 | ||
4482 | ||
251a2a95 | 4483 | /** |
e114e473 CS |
4484 | * smack_secid_to_secctx - return the smack label for a secid |
4485 | * @secid: incoming integer | |
4486 | * @secdata: destination | |
4487 | * @seclen: how long it is | |
4488 | * | |
4489 | * Exists for networking code. | |
4490 | */ | |
4491 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4492 | { | |
2f823ff8 | 4493 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4494 | |
d5630b9d | 4495 | if (secdata) |
2f823ff8 CS |
4496 | *secdata = skp->smk_known; |
4497 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4498 | return 0; |
4499 | } | |
4500 | ||
251a2a95 | 4501 | /** |
4bc87e62 CS |
4502 | * smack_secctx_to_secid - return the secid for a smack label |
4503 | * @secdata: smack label | |
4504 | * @seclen: how long result is | |
4505 | * @secid: outgoing integer | |
4506 | * | |
4507 | * Exists for audit and networking code. | |
4508 | */ | |
e52c1764 | 4509 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4510 | { |
21c7eae2 LP |
4511 | struct smack_known *skp = smk_find_entry(secdata); |
4512 | ||
4513 | if (skp) | |
4514 | *secid = skp->smk_secid; | |
4515 | else | |
4516 | *secid = 0; | |
4bc87e62 CS |
4517 | return 0; |
4518 | } | |
4519 | ||
491a0b08 CS |
4520 | /* |
4521 | * There used to be a smack_release_secctx hook | |
4522 | * that did nothing back when hooks were in a vector. | |
4523 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4524 | */ |
e114e473 | 4525 | |
1ee65e37 DQ |
4526 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4527 | { | |
4528 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4529 | } | |
4530 | ||
4531 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4532 | { | |
4533 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4534 | } | |
4535 | ||
4536 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4537 | { | |
0f8983cf | 4538 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4539 | |
0f8983cf CS |
4540 | *ctx = skp->smk_known; |
4541 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4542 | return 0; |
4543 | } | |
4544 | ||
d6d80cb5 CS |
4545 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4546 | { | |
4547 | ||
4548 | struct task_smack *tsp; | |
4549 | struct smack_known *skp; | |
4550 | struct inode_smack *isp; | |
4551 | struct cred *new_creds = *new; | |
4552 | ||
4553 | if (new_creds == NULL) { | |
4554 | new_creds = prepare_creds(); | |
4555 | if (new_creds == NULL) | |
4556 | return -ENOMEM; | |
4557 | } | |
4558 | ||
4559 | tsp = new_creds->security; | |
4560 | ||
4561 | /* | |
4562 | * Get label from overlay inode and set it in create_sid | |
4563 | */ | |
4564 | isp = d_inode(dentry->d_parent)->i_security; | |
4565 | skp = isp->smk_inode; | |
4566 | tsp->smk_task = skp; | |
4567 | *new = new_creds; | |
4568 | return 0; | |
4569 | } | |
4570 | ||
4571 | static int smack_inode_copy_up_xattr(const char *name) | |
4572 | { | |
4573 | /* | |
4574 | * Return 1 if this is the smack access Smack attribute. | |
4575 | */ | |
4576 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4577 | return 1; | |
4578 | ||
4579 | return -EOPNOTSUPP; | |
4580 | } | |
4581 | ||
4582 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4583 | struct qstr *name, | |
4584 | const struct cred *old, | |
4585 | struct cred *new) | |
4586 | { | |
4587 | struct task_smack *otsp = old->security; | |
4588 | struct task_smack *ntsp = new->security; | |
4589 | struct inode_smack *isp; | |
4590 | int may; | |
4591 | ||
4592 | /* | |
4593 | * Use the process credential unless all of | |
4594 | * the transmuting criteria are met | |
4595 | */ | |
4596 | ntsp->smk_task = otsp->smk_task; | |
4597 | ||
4598 | /* | |
4599 | * the attribute of the containing directory | |
4600 | */ | |
4601 | isp = d_inode(dentry->d_parent)->i_security; | |
4602 | ||
4603 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4604 | rcu_read_lock(); | |
4605 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4606 | isp->smk_inode->smk_known, | |
4607 | &otsp->smk_task->smk_rules); | |
4608 | rcu_read_unlock(); | |
4609 | ||
4610 | /* | |
4611 | * If the directory is transmuting and the rule | |
4612 | * providing access is transmuting use the containing | |
4613 | * directory label instead of the process label. | |
4614 | */ | |
4615 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4616 | ntsp->smk_task = isp->smk_inode; | |
4617 | } | |
4618 | return 0; | |
4619 | } | |
4620 | ||
ca97d939 | 4621 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4622 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4623 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4624 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4625 | ||
4626 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4627 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
204cc0cc | 4628 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 4629 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 4630 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 4631 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a CS |
4632 | |
4633 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
e20b043a CS |
4634 | |
4635 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4636 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4637 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4638 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4639 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4640 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4641 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4642 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4643 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4644 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4645 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4646 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4647 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4648 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4649 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4650 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4651 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4652 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4653 | ||
e20b043a CS |
4654 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4655 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4656 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4657 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4658 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4659 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4660 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4661 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4662 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4663 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4664 | ||
4665 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4666 | ||
4667 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4668 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4669 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4670 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4671 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4672 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4673 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4674 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4675 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4676 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4677 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4678 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4679 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4680 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4681 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4682 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4683 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4684 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4685 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4686 | ||
4687 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4688 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4689 | ||
4690 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4691 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4692 | ||
0d79cbf8 EB |
4693 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
4694 | LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security), | |
e20b043a CS |
4695 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4696 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4697 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4698 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4699 | ||
0d79cbf8 EB |
4700 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
4701 | LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security), | |
e20b043a CS |
4702 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4703 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4704 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4705 | ||
0d79cbf8 EB |
4706 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
4707 | LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security), | |
e20b043a CS |
4708 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4709 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4710 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4711 | ||
4712 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4713 | ||
4714 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4715 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4716 | ||
4717 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4718 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4719 | ||
4720 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4721 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4722 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4723 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4724 | #endif |
e20b043a CS |
4725 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4726 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4727 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4728 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4729 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4730 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4731 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4732 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4733 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4734 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4735 | |
e114e473 CS |
4736 | /* key management security hooks */ |
4737 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4738 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4739 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4740 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4741 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4742 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4743 | |
4744 | /* Audit hooks */ | |
4745 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4746 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4747 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4748 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4749 | #endif /* CONFIG_AUDIT */ |
4750 | ||
e20b043a CS |
4751 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4752 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4753 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4754 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4755 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4756 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4757 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4758 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4759 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4760 | }; |
4761 | ||
7198e2ee | 4762 | |
86812bb0 | 4763 | static __init void init_smack_known_list(void) |
7198e2ee | 4764 | { |
86812bb0 CS |
4765 | /* |
4766 | * Initialize rule list locks | |
4767 | */ | |
4768 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4769 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4770 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4771 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4772 | mutex_init(&smack_known_web.smk_rules_lock); |
4773 | /* | |
4774 | * Initialize rule lists | |
4775 | */ | |
4776 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4777 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4778 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4779 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4780 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4781 | /* | |
4782 | * Create the known labels list | |
4783 | */ | |
4d7cf4a1 TS |
4784 | smk_insert_entry(&smack_known_huh); |
4785 | smk_insert_entry(&smack_known_hat); | |
4786 | smk_insert_entry(&smack_known_star); | |
4787 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4788 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4789 | } |
4790 | ||
e114e473 CS |
4791 | /** |
4792 | * smack_init - initialize the smack system | |
4793 | * | |
4794 | * Returns 0 | |
4795 | */ | |
4796 | static __init int smack_init(void) | |
4797 | { | |
d84f4f99 | 4798 | struct cred *cred; |
676dac4b | 4799 | struct task_smack *tsp; |
d84f4f99 | 4800 | |
b1d9e6b0 | 4801 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4802 | return 0; |
4803 | ||
1a5b472b R |
4804 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4805 | if (!smack_inode_cache) | |
4806 | return -ENOMEM; | |
4807 | ||
2f823ff8 CS |
4808 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4809 | GFP_KERNEL); | |
1a5b472b R |
4810 | if (tsp == NULL) { |
4811 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4812 | return -ENOMEM; |
1a5b472b | 4813 | } |
676dac4b | 4814 | |
d21b7b04 JB |
4815 | smack_enabled = 1; |
4816 | ||
21abb1ec CS |
4817 | pr_info("Smack: Initializing.\n"); |
4818 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4819 | pr_info("Smack: Netfilter enabled.\n"); | |
4820 | #endif | |
4821 | #ifdef SMACK_IPV6_PORT_LABELING | |
4822 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4823 | #endif | |
4824 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4825 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4826 | #endif | |
e114e473 CS |
4827 | |
4828 | /* | |
4829 | * Set the security state for the initial task. | |
4830 | */ | |
d84f4f99 | 4831 | cred = (struct cred *) current->cred; |
676dac4b | 4832 | cred->security = tsp; |
e114e473 | 4833 | |
86812bb0 CS |
4834 | /* initialize the smack_known_list */ |
4835 | init_smack_known_list(); | |
e114e473 CS |
4836 | |
4837 | /* | |
4838 | * Register with LSM | |
4839 | */ | |
d69dece5 | 4840 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); |
e114e473 CS |
4841 | |
4842 | return 0; | |
4843 | } | |
4844 | ||
4845 | /* | |
4846 | * Smack requires early initialization in order to label | |
4847 | * all processes and objects when they are created. | |
4848 | */ | |
3d6e5f6d | 4849 | DEFINE_LSM(smack) = { |
07aed2f2 | 4850 | .name = "smack", |
3d6e5f6d KC |
4851 | .init = smack_init, |
4852 | }; |