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Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
e114e473 CS |
31 | #include <linux/mutex.h> |
32 | #include <linux/pipe_fs_i.h> | |
e114e473 | 33 | #include <net/cipso_ipv4.h> |
d20bdda6 | 34 | #include <linux/audit.h> |
1fd7317d | 35 | #include <linux/magic.h> |
2a7dba39 | 36 | #include <linux/dcache.h> |
16014d87 | 37 | #include <linux/personality.h> |
40401530 AV |
38 | #include <linux/msg.h> |
39 | #include <linux/shm.h> | |
40 | #include <linux/binfmts.h> | |
e114e473 CS |
41 | #include "smack.h" |
42 | ||
c69e8d9c DH |
43 | #define task_security(task) (task_cred_xxx((task), security)) |
44 | ||
5c6d1125 JS |
45 | #define TRANS_TRUE "TRUE" |
46 | #define TRANS_TRUE_SIZE 4 | |
47 | ||
e114e473 CS |
48 | /** |
49 | * smk_fetch - Fetch the smack label from a file. | |
50 | * @ip: a pointer to the inode | |
51 | * @dp: a pointer to the dentry | |
52 | * | |
53 | * Returns a pointer to the master list entry for the Smack label | |
54 | * or NULL if there was no label to fetch. | |
55 | */ | |
676dac4b | 56 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
57 | { |
58 | int rc; | |
f7112e6c CS |
59 | char *buffer; |
60 | char *result = NULL; | |
e114e473 CS |
61 | |
62 | if (ip->i_op->getxattr == NULL) | |
63 | return NULL; | |
64 | ||
f7112e6c CS |
65 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
66 | if (buffer == NULL) | |
e114e473 CS |
67 | return NULL; |
68 | ||
f7112e6c CS |
69 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
70 | if (rc > 0) | |
71 | result = smk_import(buffer, rc); | |
72 | ||
73 | kfree(buffer); | |
74 | ||
75 | return result; | |
e114e473 CS |
76 | } |
77 | ||
78 | /** | |
79 | * new_inode_smack - allocate an inode security blob | |
80 | * @smack: a pointer to the Smack label to use in the blob | |
81 | * | |
82 | * Returns the new blob or NULL if there's no memory available | |
83 | */ | |
84 | struct inode_smack *new_inode_smack(char *smack) | |
85 | { | |
86 | struct inode_smack *isp; | |
87 | ||
ceffec55 | 88 | isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); |
e114e473 CS |
89 | if (isp == NULL) |
90 | return NULL; | |
91 | ||
92 | isp->smk_inode = smack; | |
93 | isp->smk_flags = 0; | |
94 | mutex_init(&isp->smk_lock); | |
95 | ||
96 | return isp; | |
97 | } | |
98 | ||
7898e1f8 CS |
99 | /** |
100 | * new_task_smack - allocate a task security blob | |
101 | * @smack: a pointer to the Smack label to use in the blob | |
102 | * | |
103 | * Returns the new blob or NULL if there's no memory available | |
104 | */ | |
105 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
106 | { | |
107 | struct task_smack *tsp; | |
108 | ||
109 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
110 | if (tsp == NULL) | |
111 | return NULL; | |
112 | ||
113 | tsp->smk_task = task; | |
114 | tsp->smk_forked = forked; | |
115 | INIT_LIST_HEAD(&tsp->smk_rules); | |
116 | mutex_init(&tsp->smk_rules_lock); | |
117 | ||
118 | return tsp; | |
119 | } | |
120 | ||
121 | /** | |
122 | * smk_copy_rules - copy a rule set | |
123 | * @nhead - new rules header pointer | |
124 | * @ohead - old rules header pointer | |
125 | * | |
126 | * Returns 0 on success, -ENOMEM on error | |
127 | */ | |
128 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
129 | gfp_t gfp) | |
130 | { | |
131 | struct smack_rule *nrp; | |
132 | struct smack_rule *orp; | |
133 | int rc = 0; | |
134 | ||
135 | INIT_LIST_HEAD(nhead); | |
136 | ||
137 | list_for_each_entry_rcu(orp, ohead, list) { | |
138 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
139 | if (nrp == NULL) { | |
140 | rc = -ENOMEM; | |
141 | break; | |
142 | } | |
143 | *nrp = *orp; | |
144 | list_add_rcu(&nrp->list, nhead); | |
145 | } | |
146 | return rc; | |
147 | } | |
148 | ||
e114e473 CS |
149 | /* |
150 | * LSM hooks. | |
151 | * We he, that is fun! | |
152 | */ | |
153 | ||
154 | /** | |
9e48858f | 155 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 156 | * @ctp: child task pointer |
251a2a95 | 157 | * @mode: ptrace attachment mode |
e114e473 CS |
158 | * |
159 | * Returns 0 if access is OK, an error code otherwise | |
160 | * | |
161 | * Do the capability checks, and require read and write. | |
162 | */ | |
9e48858f | 163 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
164 | { |
165 | int rc; | |
ecfcc53f | 166 | struct smk_audit_info ad; |
7898e1f8 | 167 | char *tsp; |
e114e473 | 168 | |
9e48858f | 169 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
170 | if (rc != 0) |
171 | return rc; | |
172 | ||
676dac4b | 173 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
174 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
175 | smk_ad_setfield_u_tsk(&ad, ctp); | |
176 | ||
7898e1f8 | 177 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
178 | return rc; |
179 | } | |
180 | ||
181 | /** | |
182 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
183 | * @ptp: parent task pointer | |
184 | * | |
185 | * Returns 0 if access is OK, an error code otherwise | |
186 | * | |
187 | * Do the capability checks, and require read and write. | |
188 | */ | |
189 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
190 | { | |
191 | int rc; | |
ecfcc53f | 192 | struct smk_audit_info ad; |
7898e1f8 | 193 | char *tsp; |
5cd9c58f DH |
194 | |
195 | rc = cap_ptrace_traceme(ptp); | |
196 | if (rc != 0) | |
197 | return rc; | |
e114e473 | 198 | |
7898e1f8 | 199 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
200 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
201 | smk_ad_setfield_u_tsk(&ad, ptp); | |
202 | ||
7898e1f8 | 203 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
204 | return rc; |
205 | } | |
206 | ||
207 | /** | |
208 | * smack_syslog - Smack approval on syslog | |
209 | * @type: message type | |
210 | * | |
211 | * Require that the task has the floor label | |
212 | * | |
213 | * Returns 0 on success, error code otherwise. | |
214 | */ | |
12b3052c | 215 | static int smack_syslog(int typefrom_file) |
e114e473 | 216 | { |
12b3052c | 217 | int rc = 0; |
676dac4b | 218 | char *sp = smk_of_current(); |
e114e473 | 219 | |
e114e473 CS |
220 | if (capable(CAP_MAC_OVERRIDE)) |
221 | return 0; | |
222 | ||
223 | if (sp != smack_known_floor.smk_known) | |
224 | rc = -EACCES; | |
225 | ||
226 | return rc; | |
227 | } | |
228 | ||
229 | ||
230 | /* | |
231 | * Superblock Hooks. | |
232 | */ | |
233 | ||
234 | /** | |
235 | * smack_sb_alloc_security - allocate a superblock blob | |
236 | * @sb: the superblock getting the blob | |
237 | * | |
238 | * Returns 0 on success or -ENOMEM on error. | |
239 | */ | |
240 | static int smack_sb_alloc_security(struct super_block *sb) | |
241 | { | |
242 | struct superblock_smack *sbsp; | |
243 | ||
244 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
245 | ||
246 | if (sbsp == NULL) | |
247 | return -ENOMEM; | |
248 | ||
249 | sbsp->smk_root = smack_known_floor.smk_known; | |
250 | sbsp->smk_default = smack_known_floor.smk_known; | |
251 | sbsp->smk_floor = smack_known_floor.smk_known; | |
252 | sbsp->smk_hat = smack_known_hat.smk_known; | |
253 | sbsp->smk_initialized = 0; | |
254 | spin_lock_init(&sbsp->smk_sblock); | |
255 | ||
256 | sb->s_security = sbsp; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /** | |
262 | * smack_sb_free_security - free a superblock blob | |
263 | * @sb: the superblock getting the blob | |
264 | * | |
265 | */ | |
266 | static void smack_sb_free_security(struct super_block *sb) | |
267 | { | |
268 | kfree(sb->s_security); | |
269 | sb->s_security = NULL; | |
270 | } | |
271 | ||
272 | /** | |
273 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 274 | * @orig: where to start |
251a2a95 | 275 | * @smackopts: mount options string |
e114e473 CS |
276 | * |
277 | * Returns 0 on success or -ENOMEM on error. | |
278 | * | |
279 | * Copy the Smack specific mount options out of the mount | |
280 | * options list. | |
281 | */ | |
e0007529 | 282 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
283 | { |
284 | char *cp, *commap, *otheropts, *dp; | |
285 | ||
e114e473 CS |
286 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
287 | if (otheropts == NULL) | |
288 | return -ENOMEM; | |
289 | ||
290 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
291 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
292 | dp = smackopts; | |
293 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
294 | dp = smackopts; | |
295 | else if (strstr(cp, SMK_FSHAT) == cp) | |
296 | dp = smackopts; | |
297 | else if (strstr(cp, SMK_FSROOT) == cp) | |
298 | dp = smackopts; | |
299 | else | |
300 | dp = otheropts; | |
301 | ||
302 | commap = strchr(cp, ','); | |
303 | if (commap != NULL) | |
304 | *commap = '\0'; | |
305 | ||
306 | if (*dp != '\0') | |
307 | strcat(dp, ","); | |
308 | strcat(dp, cp); | |
309 | } | |
310 | ||
311 | strcpy(orig, otheropts); | |
312 | free_page((unsigned long)otheropts); | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | /** | |
318 | * smack_sb_kern_mount - Smack specific mount processing | |
319 | * @sb: the file system superblock | |
12204e24 | 320 | * @flags: the mount flags |
e114e473 CS |
321 | * @data: the smack mount options |
322 | * | |
323 | * Returns 0 on success, an error code on failure | |
324 | */ | |
12204e24 | 325 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
326 | { |
327 | struct dentry *root = sb->s_root; | |
328 | struct inode *inode = root->d_inode; | |
329 | struct superblock_smack *sp = sb->s_security; | |
330 | struct inode_smack *isp; | |
331 | char *op; | |
332 | char *commap; | |
333 | char *nsp; | |
334 | ||
335 | spin_lock(&sp->smk_sblock); | |
336 | if (sp->smk_initialized != 0) { | |
337 | spin_unlock(&sp->smk_sblock); | |
338 | return 0; | |
339 | } | |
340 | sp->smk_initialized = 1; | |
341 | spin_unlock(&sp->smk_sblock); | |
342 | ||
343 | for (op = data; op != NULL; op = commap) { | |
344 | commap = strchr(op, ','); | |
345 | if (commap != NULL) | |
346 | *commap++ = '\0'; | |
347 | ||
348 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
349 | op += strlen(SMK_FSHAT); | |
350 | nsp = smk_import(op, 0); | |
351 | if (nsp != NULL) | |
352 | sp->smk_hat = nsp; | |
353 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
354 | op += strlen(SMK_FSFLOOR); | |
355 | nsp = smk_import(op, 0); | |
356 | if (nsp != NULL) | |
357 | sp->smk_floor = nsp; | |
358 | } else if (strncmp(op, SMK_FSDEFAULT, | |
359 | strlen(SMK_FSDEFAULT)) == 0) { | |
360 | op += strlen(SMK_FSDEFAULT); | |
361 | nsp = smk_import(op, 0); | |
362 | if (nsp != NULL) | |
363 | sp->smk_default = nsp; | |
364 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
365 | op += strlen(SMK_FSROOT); | |
366 | nsp = smk_import(op, 0); | |
367 | if (nsp != NULL) | |
368 | sp->smk_root = nsp; | |
369 | } | |
370 | } | |
371 | ||
372 | /* | |
373 | * Initialize the root inode. | |
374 | */ | |
375 | isp = inode->i_security; | |
376 | if (isp == NULL) | |
377 | inode->i_security = new_inode_smack(sp->smk_root); | |
378 | else | |
379 | isp->smk_inode = sp->smk_root; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /** | |
385 | * smack_sb_statfs - Smack check on statfs | |
386 | * @dentry: identifies the file system in question | |
387 | * | |
388 | * Returns 0 if current can read the floor of the filesystem, | |
389 | * and error code otherwise | |
390 | */ | |
391 | static int smack_sb_statfs(struct dentry *dentry) | |
392 | { | |
393 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
394 | int rc; |
395 | struct smk_audit_info ad; | |
396 | ||
a269434d | 397 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 398 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 399 | |
ecfcc53f EB |
400 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
401 | return rc; | |
e114e473 CS |
402 | } |
403 | ||
404 | /** | |
405 | * smack_sb_mount - Smack check for mounting | |
406 | * @dev_name: unused | |
251a2a95 | 407 | * @path: mount point |
e114e473 CS |
408 | * @type: unused |
409 | * @flags: unused | |
410 | * @data: unused | |
411 | * | |
412 | * Returns 0 if current can write the floor of the filesystem | |
413 | * being mounted on, an error code otherwise. | |
414 | */ | |
b5266eb4 | 415 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
416 | char *type, unsigned long flags, void *data) |
417 | { | |
d8c9584e | 418 | struct superblock_smack *sbp = path->dentry->d_sb->s_security; |
ecfcc53f | 419 | struct smk_audit_info ad; |
e114e473 | 420 | |
f48b7399 | 421 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f EB |
422 | smk_ad_setfield_u_fs_path(&ad, *path); |
423 | ||
424 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
425 | } |
426 | ||
427 | /** | |
428 | * smack_sb_umount - Smack check for unmounting | |
429 | * @mnt: file system to unmount | |
430 | * @flags: unused | |
431 | * | |
432 | * Returns 0 if current can write the floor of the filesystem | |
433 | * being unmounted, an error code otherwise. | |
434 | */ | |
435 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
436 | { | |
437 | struct superblock_smack *sbp; | |
ecfcc53f | 438 | struct smk_audit_info ad; |
a269434d | 439 | struct path path; |
e114e473 | 440 | |
a269434d EP |
441 | path.dentry = mnt->mnt_root; |
442 | path.mnt = mnt; | |
e114e473 | 443 | |
f48b7399 | 444 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 445 | smk_ad_setfield_u_fs_path(&ad, path); |
e114e473 | 446 | |
d8c9584e | 447 | sbp = path.dentry->d_sb->s_security; |
ecfcc53f | 448 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
e114e473 CS |
449 | } |
450 | ||
676dac4b CS |
451 | /* |
452 | * BPRM hooks | |
453 | */ | |
454 | ||
ce8a4321 CS |
455 | /** |
456 | * smack_bprm_set_creds - set creds for exec | |
457 | * @bprm: the exec information | |
458 | * | |
459 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
460 | */ | |
676dac4b CS |
461 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
462 | { | |
84088ba2 JS |
463 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
464 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 465 | struct inode_smack *isp; |
676dac4b CS |
466 | int rc; |
467 | ||
468 | rc = cap_bprm_set_creds(bprm); | |
469 | if (rc != 0) | |
470 | return rc; | |
471 | ||
472 | if (bprm->cred_prepared) | |
473 | return 0; | |
474 | ||
84088ba2 JS |
475 | isp = inode->i_security; |
476 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
477 | return 0; |
478 | ||
84088ba2 JS |
479 | if (bprm->unsafe) |
480 | return -EPERM; | |
676dac4b | 481 | |
84088ba2 JS |
482 | bsp->smk_task = isp->smk_task; |
483 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 484 | |
84088ba2 JS |
485 | return 0; |
486 | } | |
676dac4b | 487 | |
84088ba2 JS |
488 | /** |
489 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
490 | * from bprm. | |
491 | * | |
492 | * @bprm: binprm for exec | |
493 | */ | |
494 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
495 | { | |
496 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 497 | |
84088ba2 JS |
498 | if (bsp->smk_task != bsp->smk_forked) |
499 | current->pdeath_signal = 0; | |
500 | } | |
501 | ||
502 | /** | |
503 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
504 | * @bprm: binprm for exec | |
505 | * | |
506 | * Returns 0 on success. | |
507 | */ | |
508 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
509 | { | |
510 | struct task_smack *tsp = current_security(); | |
511 | int ret = cap_bprm_secureexec(bprm); | |
512 | ||
513 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
514 | ret = 1; | |
515 | ||
516 | return ret; | |
676dac4b CS |
517 | } |
518 | ||
e114e473 CS |
519 | /* |
520 | * Inode hooks | |
521 | */ | |
522 | ||
523 | /** | |
524 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 525 | * @inode: the inode in need of a blob |
e114e473 CS |
526 | * |
527 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
528 | */ | |
529 | static int smack_inode_alloc_security(struct inode *inode) | |
530 | { | |
676dac4b | 531 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
532 | if (inode->i_security == NULL) |
533 | return -ENOMEM; | |
534 | return 0; | |
535 | } | |
536 | ||
537 | /** | |
538 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 539 | * @inode: the inode with a blob |
e114e473 CS |
540 | * |
541 | * Clears the blob pointer in inode | |
542 | */ | |
543 | static void smack_inode_free_security(struct inode *inode) | |
544 | { | |
545 | kfree(inode->i_security); | |
546 | inode->i_security = NULL; | |
547 | } | |
548 | ||
549 | /** | |
550 | * smack_inode_init_security - copy out the smack from an inode | |
551 | * @inode: the inode | |
552 | * @dir: unused | |
2a7dba39 | 553 | * @qstr: unused |
e114e473 CS |
554 | * @name: where to put the attribute name |
555 | * @value: where to put the attribute value | |
556 | * @len: where to put the length of the attribute | |
557 | * | |
558 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
559 | */ | |
560 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
2a7dba39 EP |
561 | const struct qstr *qstr, char **name, |
562 | void **value, size_t *len) | |
e114e473 | 563 | { |
272cd7a8 | 564 | struct smack_known *skp; |
2267b13a | 565 | struct inode_smack *issp = inode->i_security; |
272cd7a8 | 566 | char *csp = smk_of_current(); |
e114e473 | 567 | char *isp = smk_of_inode(inode); |
5c6d1125 | 568 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 569 | int may; |
e114e473 CS |
570 | |
571 | if (name) { | |
ceffec55 | 572 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS); |
e114e473 CS |
573 | if (*name == NULL) |
574 | return -ENOMEM; | |
575 | } | |
576 | ||
577 | if (value) { | |
272cd7a8 | 578 | skp = smk_find_entry(csp); |
7898e1f8 | 579 | rcu_read_lock(); |
272cd7a8 | 580 | may = smk_access_entry(csp, dsp, &skp->smk_rules); |
7898e1f8 | 581 | rcu_read_unlock(); |
5c6d1125 JS |
582 | |
583 | /* | |
584 | * If the access rule allows transmutation and | |
585 | * the directory requests transmutation then | |
586 | * by all means transmute. | |
2267b13a | 587 | * Mark the inode as changed. |
5c6d1125 | 588 | */ |
7898e1f8 | 589 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 590 | smk_inode_transmutable(dir)) { |
5c6d1125 | 591 | isp = dsp; |
2267b13a CS |
592 | issp->smk_flags |= SMK_INODE_CHANGED; |
593 | } | |
5c6d1125 | 594 | |
ceffec55 | 595 | *value = kstrdup(isp, GFP_NOFS); |
e114e473 CS |
596 | if (*value == NULL) |
597 | return -ENOMEM; | |
598 | } | |
599 | ||
600 | if (len) | |
601 | *len = strlen(isp) + 1; | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | /** | |
607 | * smack_inode_link - Smack check on link | |
608 | * @old_dentry: the existing object | |
609 | * @dir: unused | |
610 | * @new_dentry: the new object | |
611 | * | |
612 | * Returns 0 if access is permitted, an error code otherwise | |
613 | */ | |
614 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
615 | struct dentry *new_dentry) | |
616 | { | |
e114e473 | 617 | char *isp; |
ecfcc53f EB |
618 | struct smk_audit_info ad; |
619 | int rc; | |
620 | ||
a269434d | 621 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 622 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
623 | |
624 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 625 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
626 | |
627 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
628 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
629 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
630 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
631 | } |
632 | ||
633 | return rc; | |
634 | } | |
635 | ||
636 | /** | |
637 | * smack_inode_unlink - Smack check on inode deletion | |
638 | * @dir: containing directory object | |
639 | * @dentry: file to unlink | |
640 | * | |
641 | * Returns 0 if current can write the containing directory | |
642 | * and the object, error code otherwise | |
643 | */ | |
644 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
645 | { | |
646 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 647 | struct smk_audit_info ad; |
e114e473 CS |
648 | int rc; |
649 | ||
a269434d | 650 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
651 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
652 | ||
e114e473 CS |
653 | /* |
654 | * You need write access to the thing you're unlinking | |
655 | */ | |
ecfcc53f EB |
656 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
657 | if (rc == 0) { | |
e114e473 CS |
658 | /* |
659 | * You also need write access to the containing directory | |
660 | */ | |
ecfcc53f EB |
661 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
662 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
663 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
664 | } | |
e114e473 CS |
665 | return rc; |
666 | } | |
667 | ||
668 | /** | |
669 | * smack_inode_rmdir - Smack check on directory deletion | |
670 | * @dir: containing directory object | |
671 | * @dentry: directory to unlink | |
672 | * | |
673 | * Returns 0 if current can write the containing directory | |
674 | * and the directory, error code otherwise | |
675 | */ | |
676 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
677 | { | |
ecfcc53f | 678 | struct smk_audit_info ad; |
e114e473 CS |
679 | int rc; |
680 | ||
a269434d | 681 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
682 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
683 | ||
e114e473 CS |
684 | /* |
685 | * You need write access to the thing you're removing | |
686 | */ | |
ecfcc53f EB |
687 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
688 | if (rc == 0) { | |
e114e473 CS |
689 | /* |
690 | * You also need write access to the containing directory | |
691 | */ | |
ecfcc53f EB |
692 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
693 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
694 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
695 | } | |
e114e473 CS |
696 | |
697 | return rc; | |
698 | } | |
699 | ||
700 | /** | |
701 | * smack_inode_rename - Smack check on rename | |
702 | * @old_inode: the old directory | |
703 | * @old_dentry: unused | |
704 | * @new_inode: the new directory | |
705 | * @new_dentry: unused | |
706 | * | |
707 | * Read and write access is required on both the old and | |
708 | * new directories. | |
709 | * | |
710 | * Returns 0 if access is permitted, an error code otherwise | |
711 | */ | |
712 | static int smack_inode_rename(struct inode *old_inode, | |
713 | struct dentry *old_dentry, | |
714 | struct inode *new_inode, | |
715 | struct dentry *new_dentry) | |
716 | { | |
717 | int rc; | |
718 | char *isp; | |
ecfcc53f EB |
719 | struct smk_audit_info ad; |
720 | ||
a269434d | 721 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 722 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
723 | |
724 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 725 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
726 | |
727 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
728 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
729 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
730 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 731 | } |
e114e473 CS |
732 | return rc; |
733 | } | |
734 | ||
735 | /** | |
736 | * smack_inode_permission - Smack version of permission() | |
737 | * @inode: the inode in question | |
738 | * @mask: the access requested | |
e114e473 CS |
739 | * |
740 | * This is the important Smack hook. | |
741 | * | |
742 | * Returns 0 if access is permitted, -EACCES otherwise | |
743 | */ | |
e74f71eb | 744 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 745 | { |
ecfcc53f | 746 | struct smk_audit_info ad; |
e74f71eb | 747 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
748 | |
749 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
750 | /* |
751 | * No permission to check. Existence test. Yup, it's there. | |
752 | */ | |
753 | if (mask == 0) | |
754 | return 0; | |
8c9e80ed AK |
755 | |
756 | /* May be droppable after audit */ | |
e74f71eb | 757 | if (no_block) |
8c9e80ed | 758 | return -ECHILD; |
f48b7399 | 759 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
760 | smk_ad_setfield_u_fs_inode(&ad, inode); |
761 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
762 | } |
763 | ||
764 | /** | |
765 | * smack_inode_setattr - Smack check for setting attributes | |
766 | * @dentry: the object | |
767 | * @iattr: for the force flag | |
768 | * | |
769 | * Returns 0 if access is permitted, an error code otherwise | |
770 | */ | |
771 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
772 | { | |
ecfcc53f | 773 | struct smk_audit_info ad; |
e114e473 CS |
774 | /* |
775 | * Need to allow for clearing the setuid bit. | |
776 | */ | |
777 | if (iattr->ia_valid & ATTR_FORCE) | |
778 | return 0; | |
a269434d | 779 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 780 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 781 | |
ecfcc53f | 782 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
783 | } |
784 | ||
785 | /** | |
786 | * smack_inode_getattr - Smack check for getting attributes | |
787 | * @mnt: unused | |
788 | * @dentry: the object | |
789 | * | |
790 | * Returns 0 if access is permitted, an error code otherwise | |
791 | */ | |
792 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
793 | { | |
ecfcc53f | 794 | struct smk_audit_info ad; |
a269434d | 795 | struct path path; |
ecfcc53f | 796 | |
a269434d EP |
797 | path.dentry = dentry; |
798 | path.mnt = mnt; | |
ecfcc53f | 799 | |
f48b7399 | 800 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 801 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 802 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
803 | } |
804 | ||
805 | /** | |
806 | * smack_inode_setxattr - Smack check for setting xattrs | |
807 | * @dentry: the object | |
808 | * @name: name of the attribute | |
809 | * @value: unused | |
810 | * @size: unused | |
811 | * @flags: unused | |
812 | * | |
813 | * This protects the Smack attribute explicitly. | |
814 | * | |
815 | * Returns 0 if access is permitted, an error code otherwise | |
816 | */ | |
8f0cfa52 DH |
817 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
818 | const void *value, size_t size, int flags) | |
e114e473 | 819 | { |
ecfcc53f | 820 | struct smk_audit_info ad; |
bcdca225 | 821 | int rc = 0; |
e114e473 | 822 | |
bcdca225 CS |
823 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
824 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 825 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
826 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
827 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
828 | if (!capable(CAP_MAC_ADMIN)) |
829 | rc = -EPERM; | |
defc433b EB |
830 | /* |
831 | * check label validity here so import wont fail on | |
832 | * post_setxattr | |
833 | */ | |
f7112e6c | 834 | if (size == 0 || size >= SMK_LONGLABEL || |
defc433b | 835 | smk_import(value, size) == NULL) |
4303154e | 836 | rc = -EINVAL; |
5c6d1125 JS |
837 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
838 | if (!capable(CAP_MAC_ADMIN)) | |
839 | rc = -EPERM; | |
840 | if (size != TRANS_TRUE_SIZE || | |
841 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
842 | rc = -EINVAL; | |
bcdca225 CS |
843 | } else |
844 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
845 | ||
a269434d | 846 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
847 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
848 | ||
bcdca225 | 849 | if (rc == 0) |
ecfcc53f | 850 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
851 | |
852 | return rc; | |
e114e473 CS |
853 | } |
854 | ||
855 | /** | |
856 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
857 | * @dentry: object | |
858 | * @name: attribute name | |
859 | * @value: attribute value | |
860 | * @size: attribute size | |
861 | * @flags: unused | |
862 | * | |
863 | * Set the pointer in the inode blob to the entry found | |
864 | * in the master label list. | |
865 | */ | |
8f0cfa52 DH |
866 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
867 | const void *value, size_t size, int flags) | |
e114e473 | 868 | { |
e114e473 | 869 | char *nsp; |
5c6d1125 | 870 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
871 | |
872 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 873 | nsp = smk_import(value, size); |
676dac4b CS |
874 | if (nsp != NULL) |
875 | isp->smk_inode = nsp; | |
876 | else | |
877 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
878 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
879 | nsp = smk_import(value, size); | |
676dac4b CS |
880 | if (nsp != NULL) |
881 | isp->smk_task = nsp; | |
882 | else | |
883 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
884 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
885 | nsp = smk_import(value, size); | |
886 | if (nsp != NULL) | |
887 | isp->smk_mmap = nsp; | |
888 | else | |
889 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
890 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
891 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
892 | |
893 | return; | |
894 | } | |
895 | ||
ce8a4321 | 896 | /** |
e114e473 CS |
897 | * smack_inode_getxattr - Smack check on getxattr |
898 | * @dentry: the object | |
899 | * @name: unused | |
900 | * | |
901 | * Returns 0 if access is permitted, an error code otherwise | |
902 | */ | |
8f0cfa52 | 903 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 904 | { |
ecfcc53f EB |
905 | struct smk_audit_info ad; |
906 | ||
a269434d | 907 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
908 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
909 | ||
910 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
911 | } |
912 | ||
ce8a4321 | 913 | /** |
e114e473 CS |
914 | * smack_inode_removexattr - Smack check on removexattr |
915 | * @dentry: the object | |
916 | * @name: name of the attribute | |
917 | * | |
918 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
919 | * | |
920 | * Returns 0 if access is permitted, an error code otherwise | |
921 | */ | |
8f0cfa52 | 922 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 923 | { |
676dac4b | 924 | struct inode_smack *isp; |
ecfcc53f | 925 | struct smk_audit_info ad; |
bcdca225 | 926 | int rc = 0; |
e114e473 | 927 | |
bcdca225 CS |
928 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
929 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 930 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 931 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
932 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
933 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
934 | if (!capable(CAP_MAC_ADMIN)) |
935 | rc = -EPERM; | |
936 | } else | |
937 | rc = cap_inode_removexattr(dentry, name); | |
938 | ||
a269434d | 939 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 940 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 941 | if (rc == 0) |
ecfcc53f | 942 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 943 | |
676dac4b CS |
944 | if (rc == 0) { |
945 | isp = dentry->d_inode->i_security; | |
946 | isp->smk_task = NULL; | |
7898e1f8 | 947 | isp->smk_mmap = NULL; |
676dac4b CS |
948 | } |
949 | ||
bcdca225 | 950 | return rc; |
e114e473 CS |
951 | } |
952 | ||
953 | /** | |
954 | * smack_inode_getsecurity - get smack xattrs | |
955 | * @inode: the object | |
956 | * @name: attribute name | |
957 | * @buffer: where to put the result | |
251a2a95 | 958 | * @alloc: unused |
e114e473 CS |
959 | * |
960 | * Returns the size of the attribute or an error code | |
961 | */ | |
962 | static int smack_inode_getsecurity(const struct inode *inode, | |
963 | const char *name, void **buffer, | |
964 | bool alloc) | |
965 | { | |
966 | struct socket_smack *ssp; | |
967 | struct socket *sock; | |
968 | struct super_block *sbp; | |
969 | struct inode *ip = (struct inode *)inode; | |
970 | char *isp; | |
971 | int ilen; | |
972 | int rc = 0; | |
973 | ||
974 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
975 | isp = smk_of_inode(inode); | |
976 | ilen = strlen(isp) + 1; | |
977 | *buffer = isp; | |
978 | return ilen; | |
979 | } | |
980 | ||
981 | /* | |
982 | * The rest of the Smack xattrs are only on sockets. | |
983 | */ | |
984 | sbp = ip->i_sb; | |
985 | if (sbp->s_magic != SOCKFS_MAGIC) | |
986 | return -EOPNOTSUPP; | |
987 | ||
988 | sock = SOCKET_I(ip); | |
2e1d146a | 989 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
990 | return -EOPNOTSUPP; |
991 | ||
992 | ssp = sock->sk->sk_security; | |
993 | ||
994 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
995 | isp = ssp->smk_in; | |
996 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
997 | isp = ssp->smk_out; | |
998 | else | |
999 | return -EOPNOTSUPP; | |
1000 | ||
1001 | ilen = strlen(isp) + 1; | |
1002 | if (rc == 0) { | |
1003 | *buffer = isp; | |
1004 | rc = ilen; | |
1005 | } | |
1006 | ||
1007 | return rc; | |
1008 | } | |
1009 | ||
1010 | ||
1011 | /** | |
1012 | * smack_inode_listsecurity - list the Smack attributes | |
1013 | * @inode: the object | |
1014 | * @buffer: where they go | |
1015 | * @buffer_size: size of buffer | |
1016 | * | |
1017 | * Returns 0 on success, -EINVAL otherwise | |
1018 | */ | |
1019 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1020 | size_t buffer_size) | |
1021 | { | |
1022 | int len = strlen(XATTR_NAME_SMACK); | |
1023 | ||
1024 | if (buffer != NULL && len <= buffer_size) { | |
1025 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1026 | return len; | |
1027 | } | |
1028 | return -EINVAL; | |
1029 | } | |
1030 | ||
d20bdda6 AD |
1031 | /** |
1032 | * smack_inode_getsecid - Extract inode's security id | |
1033 | * @inode: inode to extract the info from | |
1034 | * @secid: where result will be saved | |
1035 | */ | |
1036 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1037 | { | |
1038 | struct inode_smack *isp = inode->i_security; | |
1039 | ||
1040 | *secid = smack_to_secid(isp->smk_inode); | |
1041 | } | |
1042 | ||
e114e473 CS |
1043 | /* |
1044 | * File Hooks | |
1045 | */ | |
1046 | ||
1047 | /** | |
1048 | * smack_file_permission - Smack check on file operations | |
1049 | * @file: unused | |
1050 | * @mask: unused | |
1051 | * | |
1052 | * Returns 0 | |
1053 | * | |
1054 | * Should access checks be done on each read or write? | |
1055 | * UNICOS and SELinux say yes. | |
1056 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1057 | * | |
1058 | * I'll say no for now. Smack does not do the frequent | |
1059 | * label changing that SELinux does. | |
1060 | */ | |
1061 | static int smack_file_permission(struct file *file, int mask) | |
1062 | { | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * smack_file_alloc_security - assign a file security blob | |
1068 | * @file: the object | |
1069 | * | |
1070 | * The security blob for a file is a pointer to the master | |
1071 | * label list, so no allocation is done. | |
1072 | * | |
1073 | * Returns 0 | |
1074 | */ | |
1075 | static int smack_file_alloc_security(struct file *file) | |
1076 | { | |
676dac4b | 1077 | file->f_security = smk_of_current(); |
e114e473 CS |
1078 | return 0; |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * smack_file_free_security - clear a file security blob | |
1083 | * @file: the object | |
1084 | * | |
1085 | * The security blob for a file is a pointer to the master | |
1086 | * label list, so no memory is freed. | |
1087 | */ | |
1088 | static void smack_file_free_security(struct file *file) | |
1089 | { | |
1090 | file->f_security = NULL; | |
1091 | } | |
1092 | ||
1093 | /** | |
1094 | * smack_file_ioctl - Smack check on ioctls | |
1095 | * @file: the object | |
1096 | * @cmd: what to do | |
1097 | * @arg: unused | |
1098 | * | |
1099 | * Relies heavily on the correct use of the ioctl command conventions. | |
1100 | * | |
1101 | * Returns 0 if allowed, error code otherwise | |
1102 | */ | |
1103 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1104 | unsigned long arg) | |
1105 | { | |
1106 | int rc = 0; | |
ecfcc53f EB |
1107 | struct smk_audit_info ad; |
1108 | ||
f48b7399 | 1109 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1110 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1111 | |
1112 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1113 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1114 | |
1115 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1116 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1117 | |
1118 | return rc; | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * smack_file_lock - Smack check on file locking | |
1123 | * @file: the object | |
251a2a95 | 1124 | * @cmd: unused |
e114e473 CS |
1125 | * |
1126 | * Returns 0 if current has write access, error code otherwise | |
1127 | */ | |
1128 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1129 | { | |
ecfcc53f EB |
1130 | struct smk_audit_info ad; |
1131 | ||
92f42509 EP |
1132 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1133 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1134 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1135 | } |
1136 | ||
1137 | /** | |
1138 | * smack_file_fcntl - Smack check on fcntl | |
1139 | * @file: the object | |
1140 | * @cmd: what action to check | |
1141 | * @arg: unused | |
1142 | * | |
531f1d45 CS |
1143 | * Generally these operations are harmless. |
1144 | * File locking operations present an obvious mechanism | |
1145 | * for passing information, so they require write access. | |
1146 | * | |
e114e473 CS |
1147 | * Returns 0 if current has access, error code otherwise |
1148 | */ | |
1149 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1150 | unsigned long arg) | |
1151 | { | |
ecfcc53f | 1152 | struct smk_audit_info ad; |
531f1d45 | 1153 | int rc = 0; |
e114e473 | 1154 | |
ecfcc53f | 1155 | |
e114e473 | 1156 | switch (cmd) { |
e114e473 | 1157 | case F_GETLK: |
e114e473 CS |
1158 | case F_SETLK: |
1159 | case F_SETLKW: | |
1160 | case F_SETOWN: | |
1161 | case F_SETSIG: | |
531f1d45 CS |
1162 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1163 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1164 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1165 | break; |
1166 | default: | |
531f1d45 | 1167 | break; |
e114e473 CS |
1168 | } |
1169 | ||
1170 | return rc; | |
1171 | } | |
1172 | ||
7898e1f8 CS |
1173 | /** |
1174 | * smack_file_mmap : | |
1175 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1176 | * if mapping anonymous memory. | |
1177 | * @file contains the file structure for file to map (may be NULL). | |
1178 | * @reqprot contains the protection requested by the application. | |
1179 | * @prot contains the protection that will be applied by the kernel. | |
1180 | * @flags contains the operational flags. | |
1181 | * Return 0 if permission is granted. | |
1182 | */ | |
1183 | static int smack_file_mmap(struct file *file, | |
1184 | unsigned long reqprot, unsigned long prot, | |
1185 | unsigned long flags, unsigned long addr, | |
1186 | unsigned long addr_only) | |
1187 | { | |
272cd7a8 | 1188 | struct smack_known *skp; |
7898e1f8 CS |
1189 | struct smack_rule *srp; |
1190 | struct task_smack *tsp; | |
1191 | char *sp; | |
1192 | char *msmack; | |
0e0a070d | 1193 | char *osmack; |
7898e1f8 CS |
1194 | struct inode_smack *isp; |
1195 | struct dentry *dp; | |
0e0a070d CS |
1196 | int may; |
1197 | int mmay; | |
1198 | int tmay; | |
7898e1f8 CS |
1199 | int rc; |
1200 | ||
1201 | /* do DAC check on address space usage */ | |
1202 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1203 | if (rc || addr_only) | |
1204 | return rc; | |
1205 | ||
1206 | if (file == NULL || file->f_dentry == NULL) | |
1207 | return 0; | |
1208 | ||
1209 | dp = file->f_dentry; | |
1210 | ||
1211 | if (dp->d_inode == NULL) | |
1212 | return 0; | |
1213 | ||
1214 | isp = dp->d_inode->i_security; | |
1215 | if (isp->smk_mmap == NULL) | |
1216 | return 0; | |
1217 | msmack = isp->smk_mmap; | |
1218 | ||
1219 | tsp = current_security(); | |
1220 | sp = smk_of_current(); | |
272cd7a8 | 1221 | skp = smk_find_entry(sp); |
7898e1f8 CS |
1222 | rc = 0; |
1223 | ||
1224 | rcu_read_lock(); | |
1225 | /* | |
1226 | * For each Smack rule associated with the subject | |
1227 | * label verify that the SMACK64MMAP also has access | |
1228 | * to that rule's object label. | |
7898e1f8 | 1229 | */ |
272cd7a8 | 1230 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1231 | osmack = srp->smk_object; |
7898e1f8 CS |
1232 | /* |
1233 | * Matching labels always allows access. | |
1234 | */ | |
0e0a070d | 1235 | if (msmack == osmack) |
7898e1f8 | 1236 | continue; |
0e0a070d CS |
1237 | /* |
1238 | * If there is a matching local rule take | |
1239 | * that into account as well. | |
1240 | */ | |
1241 | may = smk_access_entry(srp->smk_subject, osmack, | |
1242 | &tsp->smk_rules); | |
1243 | if (may == -ENOENT) | |
1244 | may = srp->smk_access; | |
1245 | else | |
1246 | may &= srp->smk_access; | |
1247 | /* | |
1248 | * If may is zero the SMACK64MMAP subject can't | |
1249 | * possibly have less access. | |
1250 | */ | |
1251 | if (may == 0) | |
1252 | continue; | |
1253 | ||
1254 | /* | |
1255 | * Fetch the global list entry. | |
1256 | * If there isn't one a SMACK64MMAP subject | |
1257 | * can't have as much access as current. | |
1258 | */ | |
272cd7a8 CS |
1259 | skp = smk_find_entry(msmack); |
1260 | mmay = smk_access_entry(msmack, osmack, &skp->smk_rules); | |
0e0a070d CS |
1261 | if (mmay == -ENOENT) { |
1262 | rc = -EACCES; | |
1263 | break; | |
1264 | } | |
1265 | /* | |
1266 | * If there is a local entry it modifies the | |
1267 | * potential access, too. | |
1268 | */ | |
1269 | tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules); | |
1270 | if (tmay != -ENOENT) | |
1271 | mmay &= tmay; | |
7898e1f8 | 1272 | |
0e0a070d CS |
1273 | /* |
1274 | * If there is any access available to current that is | |
1275 | * not available to a SMACK64MMAP subject | |
1276 | * deny access. | |
1277 | */ | |
75a25637 | 1278 | if ((may | mmay) != mmay) { |
0e0a070d | 1279 | rc = -EACCES; |
7898e1f8 | 1280 | break; |
0e0a070d | 1281 | } |
7898e1f8 CS |
1282 | } |
1283 | ||
1284 | rcu_read_unlock(); | |
1285 | ||
1286 | return rc; | |
1287 | } | |
1288 | ||
e114e473 CS |
1289 | /** |
1290 | * smack_file_set_fowner - set the file security blob value | |
1291 | * @file: object in question | |
1292 | * | |
1293 | * Returns 0 | |
1294 | * Further research may be required on this one. | |
1295 | */ | |
1296 | static int smack_file_set_fowner(struct file *file) | |
1297 | { | |
676dac4b | 1298 | file->f_security = smk_of_current(); |
e114e473 CS |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | /** | |
1303 | * smack_file_send_sigiotask - Smack on sigio | |
1304 | * @tsk: The target task | |
1305 | * @fown: the object the signal come from | |
1306 | * @signum: unused | |
1307 | * | |
1308 | * Allow a privileged task to get signals even if it shouldn't | |
1309 | * | |
1310 | * Returns 0 if a subject with the object's smack could | |
1311 | * write to the task, an error code otherwise. | |
1312 | */ | |
1313 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1314 | struct fown_struct *fown, int signum) | |
1315 | { | |
1316 | struct file *file; | |
1317 | int rc; | |
676dac4b | 1318 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1319 | struct smk_audit_info ad; |
e114e473 CS |
1320 | |
1321 | /* | |
1322 | * struct fown_struct is never outside the context of a struct file | |
1323 | */ | |
1324 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1325 | |
ecfcc53f EB |
1326 | /* we don't log here as rc can be overriden */ |
1327 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1328 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1329 | rc = 0; |
1330 | ||
1331 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1332 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1333 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1334 | return rc; |
1335 | } | |
1336 | ||
1337 | /** | |
1338 | * smack_file_receive - Smack file receive check | |
1339 | * @file: the object | |
1340 | * | |
1341 | * Returns 0 if current has access, error code otherwise | |
1342 | */ | |
1343 | static int smack_file_receive(struct file *file) | |
1344 | { | |
1345 | int may = 0; | |
ecfcc53f | 1346 | struct smk_audit_info ad; |
e114e473 | 1347 | |
ecfcc53f EB |
1348 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1349 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1350 | /* |
1351 | * This code relies on bitmasks. | |
1352 | */ | |
1353 | if (file->f_mode & FMODE_READ) | |
1354 | may = MAY_READ; | |
1355 | if (file->f_mode & FMODE_WRITE) | |
1356 | may |= MAY_WRITE; | |
1357 | ||
ecfcc53f | 1358 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1359 | } |
1360 | ||
531f1d45 CS |
1361 | /** |
1362 | * smack_dentry_open - Smack dentry open processing | |
1363 | * @file: the object | |
1364 | * @cred: unused | |
1365 | * | |
1366 | * Set the security blob in the file structure. | |
1367 | * | |
1368 | * Returns 0 | |
1369 | */ | |
1370 | static int smack_dentry_open(struct file *file, const struct cred *cred) | |
1371 | { | |
1372 | struct inode_smack *isp = file->f_path.dentry->d_inode->i_security; | |
1373 | ||
1374 | file->f_security = isp->smk_inode; | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
e114e473 CS |
1379 | /* |
1380 | * Task hooks | |
1381 | */ | |
1382 | ||
ee18d64c DH |
1383 | /** |
1384 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1385 | * @new: the new credentials | |
1386 | * @gfp: the atomicity of any memory allocations | |
1387 | * | |
1388 | * Prepare a blank set of credentials for modification. This must allocate all | |
1389 | * the memory the LSM module might require such that cred_transfer() can | |
1390 | * complete without error. | |
1391 | */ | |
1392 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1393 | { | |
7898e1f8 CS |
1394 | struct task_smack *tsp; |
1395 | ||
1396 | tsp = new_task_smack(NULL, NULL, gfp); | |
1397 | if (tsp == NULL) | |
676dac4b | 1398 | return -ENOMEM; |
7898e1f8 CS |
1399 | |
1400 | cred->security = tsp; | |
1401 | ||
ee18d64c DH |
1402 | return 0; |
1403 | } | |
1404 | ||
1405 | ||
e114e473 | 1406 | /** |
f1752eec DH |
1407 | * smack_cred_free - "free" task-level security credentials |
1408 | * @cred: the credentials in question | |
e114e473 | 1409 | * |
e114e473 | 1410 | */ |
f1752eec | 1411 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1412 | { |
7898e1f8 CS |
1413 | struct task_smack *tsp = cred->security; |
1414 | struct smack_rule *rp; | |
1415 | struct list_head *l; | |
1416 | struct list_head *n; | |
1417 | ||
1418 | if (tsp == NULL) | |
1419 | return; | |
1420 | cred->security = NULL; | |
1421 | ||
1422 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1423 | rp = list_entry(l, struct smack_rule, list); | |
1424 | list_del(&rp->list); | |
1425 | kfree(rp); | |
1426 | } | |
1427 | kfree(tsp); | |
e114e473 CS |
1428 | } |
1429 | ||
d84f4f99 DH |
1430 | /** |
1431 | * smack_cred_prepare - prepare new set of credentials for modification | |
1432 | * @new: the new credentials | |
1433 | * @old: the original credentials | |
1434 | * @gfp: the atomicity of any memory allocations | |
1435 | * | |
1436 | * Prepare a new set of credentials for modification. | |
1437 | */ | |
1438 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1439 | gfp_t gfp) | |
1440 | { | |
676dac4b CS |
1441 | struct task_smack *old_tsp = old->security; |
1442 | struct task_smack *new_tsp; | |
7898e1f8 | 1443 | int rc; |
676dac4b | 1444 | |
7898e1f8 | 1445 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1446 | if (new_tsp == NULL) |
1447 | return -ENOMEM; | |
1448 | ||
7898e1f8 CS |
1449 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1450 | if (rc != 0) | |
1451 | return rc; | |
1452 | ||
676dac4b | 1453 | new->security = new_tsp; |
d84f4f99 DH |
1454 | return 0; |
1455 | } | |
1456 | ||
ee18d64c DH |
1457 | /** |
1458 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1459 | * @new: the new credentials | |
1460 | * @old: the original credentials | |
1461 | * | |
1462 | * Fill in a set of blank credentials from another set of credentials. | |
1463 | */ | |
1464 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1465 | { | |
676dac4b CS |
1466 | struct task_smack *old_tsp = old->security; |
1467 | struct task_smack *new_tsp = new->security; | |
1468 | ||
1469 | new_tsp->smk_task = old_tsp->smk_task; | |
1470 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1471 | mutex_init(&new_tsp->smk_rules_lock); |
1472 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1473 | ||
1474 | ||
1475 | /* cbs copy rule list */ | |
ee18d64c DH |
1476 | } |
1477 | ||
3a3b7ce9 DH |
1478 | /** |
1479 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1480 | * @new: points to the set of credentials to be modified. |
1481 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1482 | * |
1483 | * Set the security data for a kernel service. | |
1484 | */ | |
1485 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1486 | { | |
676dac4b | 1487 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1488 | char *smack = smack_from_secid(secid); |
1489 | ||
1490 | if (smack == NULL) | |
1491 | return -EINVAL; | |
1492 | ||
676dac4b | 1493 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1494 | return 0; |
1495 | } | |
1496 | ||
1497 | /** | |
1498 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1499 | * @new: points to the set of credentials to be modified |
1500 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1501 | * |
1502 | * Set the file creation context in a set of credentials to the same | |
1503 | * as the objective context of the specified inode | |
1504 | */ | |
1505 | static int smack_kernel_create_files_as(struct cred *new, | |
1506 | struct inode *inode) | |
1507 | { | |
1508 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1509 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1510 | |
676dac4b CS |
1511 | tsp->smk_forked = isp->smk_inode; |
1512 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1513 | return 0; |
1514 | } | |
1515 | ||
ecfcc53f EB |
1516 | /** |
1517 | * smk_curacc_on_task - helper to log task related access | |
1518 | * @p: the task object | |
531f1d45 CS |
1519 | * @access: the access requested |
1520 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1521 | * |
1522 | * Return 0 if access is permitted | |
1523 | */ | |
531f1d45 CS |
1524 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1525 | const char *caller) | |
ecfcc53f EB |
1526 | { |
1527 | struct smk_audit_info ad; | |
1528 | ||
531f1d45 | 1529 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1530 | smk_ad_setfield_u_tsk(&ad, p); |
676dac4b | 1531 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1532 | } |
1533 | ||
e114e473 CS |
1534 | /** |
1535 | * smack_task_setpgid - Smack check on setting pgid | |
1536 | * @p: the task object | |
1537 | * @pgid: unused | |
1538 | * | |
1539 | * Return 0 if write access is permitted | |
1540 | */ | |
1541 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1542 | { | |
531f1d45 | 1543 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1544 | } |
1545 | ||
1546 | /** | |
1547 | * smack_task_getpgid - Smack access check for getpgid | |
1548 | * @p: the object task | |
1549 | * | |
1550 | * Returns 0 if current can read the object task, error code otherwise | |
1551 | */ | |
1552 | static int smack_task_getpgid(struct task_struct *p) | |
1553 | { | |
531f1d45 | 1554 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1555 | } |
1556 | ||
1557 | /** | |
1558 | * smack_task_getsid - Smack access check for getsid | |
1559 | * @p: the object task | |
1560 | * | |
1561 | * Returns 0 if current can read the object task, error code otherwise | |
1562 | */ | |
1563 | static int smack_task_getsid(struct task_struct *p) | |
1564 | { | |
531f1d45 | 1565 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1566 | } |
1567 | ||
1568 | /** | |
1569 | * smack_task_getsecid - get the secid of the task | |
1570 | * @p: the object task | |
1571 | * @secid: where to put the result | |
1572 | * | |
1573 | * Sets the secid to contain a u32 version of the smack label. | |
1574 | */ | |
1575 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1576 | { | |
676dac4b | 1577 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1578 | } |
1579 | ||
1580 | /** | |
1581 | * smack_task_setnice - Smack check on setting nice | |
1582 | * @p: the task object | |
1583 | * @nice: unused | |
1584 | * | |
1585 | * Return 0 if write access is permitted | |
1586 | */ | |
1587 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1588 | { | |
bcdca225 CS |
1589 | int rc; |
1590 | ||
1591 | rc = cap_task_setnice(p, nice); | |
1592 | if (rc == 0) | |
531f1d45 | 1593 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1594 | return rc; |
e114e473 CS |
1595 | } |
1596 | ||
1597 | /** | |
1598 | * smack_task_setioprio - Smack check on setting ioprio | |
1599 | * @p: the task object | |
1600 | * @ioprio: unused | |
1601 | * | |
1602 | * Return 0 if write access is permitted | |
1603 | */ | |
1604 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1605 | { | |
bcdca225 CS |
1606 | int rc; |
1607 | ||
1608 | rc = cap_task_setioprio(p, ioprio); | |
1609 | if (rc == 0) | |
531f1d45 | 1610 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1611 | return rc; |
e114e473 CS |
1612 | } |
1613 | ||
1614 | /** | |
1615 | * smack_task_getioprio - Smack check on reading ioprio | |
1616 | * @p: the task object | |
1617 | * | |
1618 | * Return 0 if read access is permitted | |
1619 | */ | |
1620 | static int smack_task_getioprio(struct task_struct *p) | |
1621 | { | |
531f1d45 | 1622 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1623 | } |
1624 | ||
1625 | /** | |
1626 | * smack_task_setscheduler - Smack check on setting scheduler | |
1627 | * @p: the task object | |
1628 | * @policy: unused | |
1629 | * @lp: unused | |
1630 | * | |
1631 | * Return 0 if read access is permitted | |
1632 | */ | |
b0ae1981 | 1633 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1634 | { |
bcdca225 CS |
1635 | int rc; |
1636 | ||
b0ae1981 | 1637 | rc = cap_task_setscheduler(p); |
bcdca225 | 1638 | if (rc == 0) |
531f1d45 | 1639 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1640 | return rc; |
e114e473 CS |
1641 | } |
1642 | ||
1643 | /** | |
1644 | * smack_task_getscheduler - Smack check on reading scheduler | |
1645 | * @p: the task object | |
1646 | * | |
1647 | * Return 0 if read access is permitted | |
1648 | */ | |
1649 | static int smack_task_getscheduler(struct task_struct *p) | |
1650 | { | |
531f1d45 | 1651 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1652 | } |
1653 | ||
1654 | /** | |
1655 | * smack_task_movememory - Smack check on moving memory | |
1656 | * @p: the task object | |
1657 | * | |
1658 | * Return 0 if write access is permitted | |
1659 | */ | |
1660 | static int smack_task_movememory(struct task_struct *p) | |
1661 | { | |
531f1d45 | 1662 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1663 | } |
1664 | ||
1665 | /** | |
1666 | * smack_task_kill - Smack check on signal delivery | |
1667 | * @p: the task object | |
1668 | * @info: unused | |
1669 | * @sig: unused | |
1670 | * @secid: identifies the smack to use in lieu of current's | |
1671 | * | |
1672 | * Return 0 if write access is permitted | |
1673 | * | |
1674 | * The secid behavior is an artifact of an SELinux hack | |
1675 | * in the USB code. Someday it may go away. | |
1676 | */ | |
1677 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1678 | int sig, u32 secid) | |
1679 | { | |
ecfcc53f EB |
1680 | struct smk_audit_info ad; |
1681 | ||
1682 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1683 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1684 | /* |
1685 | * Sending a signal requires that the sender | |
1686 | * can write the receiver. | |
1687 | */ | |
1688 | if (secid == 0) | |
676dac4b CS |
1689 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1690 | &ad); | |
e114e473 CS |
1691 | /* |
1692 | * If the secid isn't 0 we're dealing with some USB IO | |
1693 | * specific behavior. This is not clean. For one thing | |
1694 | * we can't take privilege into account. | |
1695 | */ | |
676dac4b CS |
1696 | return smk_access(smack_from_secid(secid), |
1697 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1698 | } |
1699 | ||
1700 | /** | |
1701 | * smack_task_wait - Smack access check for waiting | |
1702 | * @p: task to wait for | |
1703 | * | |
1704 | * Returns 0 if current can wait for p, error code otherwise | |
1705 | */ | |
1706 | static int smack_task_wait(struct task_struct *p) | |
1707 | { | |
ecfcc53f | 1708 | struct smk_audit_info ad; |
676dac4b CS |
1709 | char *sp = smk_of_current(); |
1710 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1711 | int rc; |
1712 | ||
ecfcc53f | 1713 | /* we don't log here, we can be overriden */ |
676dac4b | 1714 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1715 | if (rc == 0) |
ecfcc53f | 1716 | goto out_log; |
e114e473 CS |
1717 | |
1718 | /* | |
1719 | * Allow the operation to succeed if either task | |
1720 | * has privilege to perform operations that might | |
1721 | * account for the smack labels having gotten to | |
1722 | * be different in the first place. | |
1723 | * | |
5cd9c58f | 1724 | * This breaks the strict subject/object access |
e114e473 CS |
1725 | * control ideal, taking the object's privilege |
1726 | * state into account in the decision as well as | |
1727 | * the smack value. | |
1728 | */ | |
5cd9c58f | 1729 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1730 | rc = 0; |
1731 | /* we log only if we didn't get overriden */ | |
1732 | out_log: | |
1733 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1734 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1735 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1736 | return rc; |
1737 | } | |
1738 | ||
1739 | /** | |
1740 | * smack_task_to_inode - copy task smack into the inode blob | |
1741 | * @p: task to copy from | |
251a2a95 | 1742 | * @inode: inode to copy to |
e114e473 CS |
1743 | * |
1744 | * Sets the smack pointer in the inode security blob | |
1745 | */ | |
1746 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1747 | { | |
1748 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1749 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1750 | } |
1751 | ||
1752 | /* | |
1753 | * Socket hooks. | |
1754 | */ | |
1755 | ||
1756 | /** | |
1757 | * smack_sk_alloc_security - Allocate a socket blob | |
1758 | * @sk: the socket | |
1759 | * @family: unused | |
251a2a95 | 1760 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1761 | * |
1762 | * Assign Smack pointers to current | |
1763 | * | |
1764 | * Returns 0 on success, -ENOMEM is there's no memory | |
1765 | */ | |
1766 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1767 | { | |
676dac4b | 1768 | char *csp = smk_of_current(); |
e114e473 CS |
1769 | struct socket_smack *ssp; |
1770 | ||
1771 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1772 | if (ssp == NULL) | |
1773 | return -ENOMEM; | |
1774 | ||
1775 | ssp->smk_in = csp; | |
1776 | ssp->smk_out = csp; | |
272cd7a8 | 1777 | ssp->smk_packet = NULL; |
e114e473 CS |
1778 | |
1779 | sk->sk_security = ssp; | |
1780 | ||
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | /** | |
1785 | * smack_sk_free_security - Free a socket blob | |
1786 | * @sk: the socket | |
1787 | * | |
1788 | * Clears the blob pointer | |
1789 | */ | |
1790 | static void smack_sk_free_security(struct sock *sk) | |
1791 | { | |
1792 | kfree(sk->sk_security); | |
1793 | } | |
1794 | ||
07feee8f PM |
1795 | /** |
1796 | * smack_host_label - check host based restrictions | |
1797 | * @sip: the object end | |
1798 | * | |
1799 | * looks for host based access restrictions | |
1800 | * | |
1801 | * This version will only be appropriate for really small sets of single label | |
1802 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1803 | * taken before calling this function. | |
1804 | * | |
1805 | * Returns the label of the far end or NULL if it's not special. | |
1806 | */ | |
1807 | static char *smack_host_label(struct sockaddr_in *sip) | |
1808 | { | |
1809 | struct smk_netlbladdr *snp; | |
1810 | struct in_addr *siap = &sip->sin_addr; | |
1811 | ||
1812 | if (siap->s_addr == 0) | |
1813 | return NULL; | |
1814 | ||
1815 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1816 | /* | |
1817 | * we break after finding the first match because | |
1818 | * the list is sorted from longest to shortest mask | |
1819 | * so we have found the most specific match | |
1820 | */ | |
1821 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1822 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1823 | /* we have found the special CIPSO option */ | |
1824 | if (snp->smk_label == smack_cipso_option) | |
1825 | return NULL; | |
07feee8f | 1826 | return snp->smk_label; |
4303154e | 1827 | } |
07feee8f PM |
1828 | |
1829 | return NULL; | |
1830 | } | |
1831 | ||
e114e473 CS |
1832 | /** |
1833 | * smack_netlabel - Set the secattr on a socket | |
1834 | * @sk: the socket | |
6d3dc07c | 1835 | * @labeled: socket label scheme |
e114e473 CS |
1836 | * |
1837 | * Convert the outbound smack value (smk_out) to a | |
1838 | * secattr and attach it to the socket. | |
1839 | * | |
1840 | * Returns 0 on success or an error code | |
1841 | */ | |
6d3dc07c | 1842 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1843 | { |
f7112e6c | 1844 | struct smack_known *skp; |
07feee8f | 1845 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 1846 | int rc = 0; |
e114e473 | 1847 | |
6d3dc07c CS |
1848 | /* |
1849 | * Usually the netlabel code will handle changing the | |
1850 | * packet labeling based on the label. | |
1851 | * The case of a single label host is different, because | |
1852 | * a single label host should never get a labeled packet | |
1853 | * even though the label is usually associated with a packet | |
1854 | * label. | |
1855 | */ | |
1856 | local_bh_disable(); | |
1857 | bh_lock_sock_nested(sk); | |
1858 | ||
1859 | if (ssp->smk_out == smack_net_ambient || | |
1860 | labeled == SMACK_UNLABELED_SOCKET) | |
1861 | netlbl_sock_delattr(sk); | |
1862 | else { | |
f7112e6c CS |
1863 | skp = smk_find_entry(ssp->smk_out); |
1864 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); | |
6d3dc07c CS |
1865 | } |
1866 | ||
1867 | bh_unlock_sock(sk); | |
1868 | local_bh_enable(); | |
4bc87e62 | 1869 | |
e114e473 CS |
1870 | return rc; |
1871 | } | |
1872 | ||
07feee8f PM |
1873 | /** |
1874 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1875 | * @sk: the socket | |
1876 | * @sap: the destination address | |
1877 | * | |
1878 | * Set the correct secattr for the given socket based on the destination | |
1879 | * address and perform any outbound access checks needed. | |
1880 | * | |
1881 | * Returns 0 on success or an error code. | |
1882 | * | |
1883 | */ | |
1884 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1885 | { | |
1886 | int rc; | |
1887 | int sk_lbl; | |
1888 | char *hostsp; | |
1889 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1890 | struct smk_audit_info ad; |
07feee8f PM |
1891 | |
1892 | rcu_read_lock(); | |
1893 | hostsp = smack_host_label(sap); | |
1894 | if (hostsp != NULL) { | |
ecfcc53f | 1895 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
1896 | struct lsm_network_audit net; |
1897 | ||
48c62af6 EP |
1898 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
1899 | ad.a.u.net->family = sap->sin_family; | |
1900 | ad.a.u.net->dport = sap->sin_port; | |
1901 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 1902 | #endif |
923e9a13 | 1903 | sk_lbl = SMACK_UNLABELED_SOCKET; |
ecfcc53f | 1904 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); |
07feee8f PM |
1905 | } else { |
1906 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1907 | rc = 0; | |
1908 | } | |
1909 | rcu_read_unlock(); | |
1910 | if (rc != 0) | |
1911 | return rc; | |
1912 | ||
1913 | return smack_netlabel(sk, sk_lbl); | |
1914 | } | |
1915 | ||
e114e473 CS |
1916 | /** |
1917 | * smack_inode_setsecurity - set smack xattrs | |
1918 | * @inode: the object | |
1919 | * @name: attribute name | |
1920 | * @value: attribute value | |
1921 | * @size: size of the attribute | |
1922 | * @flags: unused | |
1923 | * | |
1924 | * Sets the named attribute in the appropriate blob | |
1925 | * | |
1926 | * Returns 0 on success, or an error code | |
1927 | */ | |
1928 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1929 | const void *value, size_t size, int flags) | |
1930 | { | |
1931 | char *sp; | |
1932 | struct inode_smack *nsp = inode->i_security; | |
1933 | struct socket_smack *ssp; | |
1934 | struct socket *sock; | |
4bc87e62 | 1935 | int rc = 0; |
e114e473 | 1936 | |
f7112e6c | 1937 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
e114e473 CS |
1938 | return -EACCES; |
1939 | ||
1940 | sp = smk_import(value, size); | |
1941 | if (sp == NULL) | |
1942 | return -EINVAL; | |
1943 | ||
1944 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1945 | nsp->smk_inode = sp; | |
ddd29ec6 | 1946 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1947 | return 0; |
1948 | } | |
1949 | /* | |
1950 | * The rest of the Smack xattrs are only on sockets. | |
1951 | */ | |
1952 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1953 | return -EOPNOTSUPP; | |
1954 | ||
1955 | sock = SOCKET_I(inode); | |
2e1d146a | 1956 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1957 | return -EOPNOTSUPP; |
1958 | ||
1959 | ssp = sock->sk->sk_security; | |
1960 | ||
1961 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1962 | ssp->smk_in = sp; | |
1963 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1964 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
1965 | if (sock->sk->sk_family != PF_UNIX) { |
1966 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
1967 | if (rc != 0) | |
1968 | printk(KERN_WARNING | |
1969 | "Smack: \"%s\" netlbl error %d.\n", | |
1970 | __func__, -rc); | |
1971 | } | |
e114e473 CS |
1972 | } else |
1973 | return -EOPNOTSUPP; | |
1974 | ||
1975 | return 0; | |
1976 | } | |
1977 | ||
1978 | /** | |
1979 | * smack_socket_post_create - finish socket setup | |
1980 | * @sock: the socket | |
1981 | * @family: protocol family | |
1982 | * @type: unused | |
1983 | * @protocol: unused | |
1984 | * @kern: unused | |
1985 | * | |
1986 | * Sets the netlabel information on the socket | |
1987 | * | |
1988 | * Returns 0 on success, and error code otherwise | |
1989 | */ | |
1990 | static int smack_socket_post_create(struct socket *sock, int family, | |
1991 | int type, int protocol, int kern) | |
1992 | { | |
2e1d146a | 1993 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1994 | return 0; |
1995 | /* | |
1996 | * Set the outbound netlbl. | |
1997 | */ | |
6d3dc07c CS |
1998 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1999 | } | |
2000 | ||
6d3dc07c CS |
2001 | /** |
2002 | * smack_socket_connect - connect access check | |
2003 | * @sock: the socket | |
2004 | * @sap: the other end | |
2005 | * @addrlen: size of sap | |
2006 | * | |
2007 | * Verifies that a connection may be possible | |
2008 | * | |
2009 | * Returns 0 on success, and error code otherwise | |
2010 | */ | |
2011 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2012 | int addrlen) | |
2013 | { | |
6d3dc07c CS |
2014 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
2015 | return 0; | |
6d3dc07c CS |
2016 | if (addrlen < sizeof(struct sockaddr_in)) |
2017 | return -EINVAL; | |
2018 | ||
07feee8f | 2019 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
2020 | } |
2021 | ||
2022 | /** | |
2023 | * smack_flags_to_may - convert S_ to MAY_ values | |
2024 | * @flags: the S_ value | |
2025 | * | |
2026 | * Returns the equivalent MAY_ value | |
2027 | */ | |
2028 | static int smack_flags_to_may(int flags) | |
2029 | { | |
2030 | int may = 0; | |
2031 | ||
2032 | if (flags & S_IRUGO) | |
2033 | may |= MAY_READ; | |
2034 | if (flags & S_IWUGO) | |
2035 | may |= MAY_WRITE; | |
2036 | if (flags & S_IXUGO) | |
2037 | may |= MAY_EXEC; | |
2038 | ||
2039 | return may; | |
2040 | } | |
2041 | ||
2042 | /** | |
2043 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2044 | * @msg: the object | |
2045 | * | |
2046 | * Returns 0 | |
2047 | */ | |
2048 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2049 | { | |
676dac4b | 2050 | msg->security = smk_of_current(); |
e114e473 CS |
2051 | return 0; |
2052 | } | |
2053 | ||
2054 | /** | |
2055 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2056 | * @msg: the object | |
2057 | * | |
2058 | * Clears the blob pointer | |
2059 | */ | |
2060 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2061 | { | |
2062 | msg->security = NULL; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * smack_of_shm - the smack pointer for the shm | |
2067 | * @shp: the object | |
2068 | * | |
2069 | * Returns a pointer to the smack value | |
2070 | */ | |
2071 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2072 | { | |
2073 | return (char *)shp->shm_perm.security; | |
2074 | } | |
2075 | ||
2076 | /** | |
2077 | * smack_shm_alloc_security - Set the security blob for shm | |
2078 | * @shp: the object | |
2079 | * | |
2080 | * Returns 0 | |
2081 | */ | |
2082 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2083 | { | |
2084 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2085 | ||
676dac4b | 2086 | isp->security = smk_of_current(); |
e114e473 CS |
2087 | return 0; |
2088 | } | |
2089 | ||
2090 | /** | |
2091 | * smack_shm_free_security - Clear the security blob for shm | |
2092 | * @shp: the object | |
2093 | * | |
2094 | * Clears the blob pointer | |
2095 | */ | |
2096 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2097 | { | |
2098 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2099 | ||
2100 | isp->security = NULL; | |
2101 | } | |
2102 | ||
ecfcc53f EB |
2103 | /** |
2104 | * smk_curacc_shm : check if current has access on shm | |
2105 | * @shp : the object | |
2106 | * @access : access requested | |
2107 | * | |
2108 | * Returns 0 if current has the requested access, error code otherwise | |
2109 | */ | |
2110 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2111 | { | |
2112 | char *ssp = smack_of_shm(shp); | |
2113 | struct smk_audit_info ad; | |
2114 | ||
2115 | #ifdef CONFIG_AUDIT | |
2116 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2117 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2118 | #endif | |
2119 | return smk_curacc(ssp, access, &ad); | |
2120 | } | |
2121 | ||
e114e473 CS |
2122 | /** |
2123 | * smack_shm_associate - Smack access check for shm | |
2124 | * @shp: the object | |
2125 | * @shmflg: access requested | |
2126 | * | |
2127 | * Returns 0 if current has the requested access, error code otherwise | |
2128 | */ | |
2129 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2130 | { | |
e114e473 CS |
2131 | int may; |
2132 | ||
2133 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2134 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2135 | } |
2136 | ||
2137 | /** | |
2138 | * smack_shm_shmctl - Smack access check for shm | |
2139 | * @shp: the object | |
2140 | * @cmd: what it wants to do | |
2141 | * | |
2142 | * Returns 0 if current has the requested access, error code otherwise | |
2143 | */ | |
2144 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2145 | { | |
e114e473 CS |
2146 | int may; |
2147 | ||
2148 | switch (cmd) { | |
2149 | case IPC_STAT: | |
2150 | case SHM_STAT: | |
2151 | may = MAY_READ; | |
2152 | break; | |
2153 | case IPC_SET: | |
2154 | case SHM_LOCK: | |
2155 | case SHM_UNLOCK: | |
2156 | case IPC_RMID: | |
2157 | may = MAY_READWRITE; | |
2158 | break; | |
2159 | case IPC_INFO: | |
2160 | case SHM_INFO: | |
2161 | /* | |
2162 | * System level information. | |
2163 | */ | |
2164 | return 0; | |
2165 | default: | |
2166 | return -EINVAL; | |
2167 | } | |
ecfcc53f | 2168 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2169 | } |
2170 | ||
2171 | /** | |
2172 | * smack_shm_shmat - Smack access for shmat | |
2173 | * @shp: the object | |
2174 | * @shmaddr: unused | |
2175 | * @shmflg: access requested | |
2176 | * | |
2177 | * Returns 0 if current has the requested access, error code otherwise | |
2178 | */ | |
2179 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2180 | int shmflg) | |
2181 | { | |
e114e473 CS |
2182 | int may; |
2183 | ||
2184 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2185 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2186 | } |
2187 | ||
2188 | /** | |
2189 | * smack_of_sem - the smack pointer for the sem | |
2190 | * @sma: the object | |
2191 | * | |
2192 | * Returns a pointer to the smack value | |
2193 | */ | |
2194 | static char *smack_of_sem(struct sem_array *sma) | |
2195 | { | |
2196 | return (char *)sma->sem_perm.security; | |
2197 | } | |
2198 | ||
2199 | /** | |
2200 | * smack_sem_alloc_security - Set the security blob for sem | |
2201 | * @sma: the object | |
2202 | * | |
2203 | * Returns 0 | |
2204 | */ | |
2205 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2206 | { | |
2207 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2208 | ||
676dac4b | 2209 | isp->security = smk_of_current(); |
e114e473 CS |
2210 | return 0; |
2211 | } | |
2212 | ||
2213 | /** | |
2214 | * smack_sem_free_security - Clear the security blob for sem | |
2215 | * @sma: the object | |
2216 | * | |
2217 | * Clears the blob pointer | |
2218 | */ | |
2219 | static void smack_sem_free_security(struct sem_array *sma) | |
2220 | { | |
2221 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2222 | ||
2223 | isp->security = NULL; | |
2224 | } | |
2225 | ||
ecfcc53f EB |
2226 | /** |
2227 | * smk_curacc_sem : check if current has access on sem | |
2228 | * @sma : the object | |
2229 | * @access : access requested | |
2230 | * | |
2231 | * Returns 0 if current has the requested access, error code otherwise | |
2232 | */ | |
2233 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2234 | { | |
2235 | char *ssp = smack_of_sem(sma); | |
2236 | struct smk_audit_info ad; | |
2237 | ||
2238 | #ifdef CONFIG_AUDIT | |
2239 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2240 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2241 | #endif | |
2242 | return smk_curacc(ssp, access, &ad); | |
2243 | } | |
2244 | ||
e114e473 CS |
2245 | /** |
2246 | * smack_sem_associate - Smack access check for sem | |
2247 | * @sma: the object | |
2248 | * @semflg: access requested | |
2249 | * | |
2250 | * Returns 0 if current has the requested access, error code otherwise | |
2251 | */ | |
2252 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2253 | { | |
e114e473 CS |
2254 | int may; |
2255 | ||
2256 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2257 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2258 | } |
2259 | ||
2260 | /** | |
2261 | * smack_sem_shmctl - Smack access check for sem | |
2262 | * @sma: the object | |
2263 | * @cmd: what it wants to do | |
2264 | * | |
2265 | * Returns 0 if current has the requested access, error code otherwise | |
2266 | */ | |
2267 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2268 | { | |
e114e473 CS |
2269 | int may; |
2270 | ||
2271 | switch (cmd) { | |
2272 | case GETPID: | |
2273 | case GETNCNT: | |
2274 | case GETZCNT: | |
2275 | case GETVAL: | |
2276 | case GETALL: | |
2277 | case IPC_STAT: | |
2278 | case SEM_STAT: | |
2279 | may = MAY_READ; | |
2280 | break; | |
2281 | case SETVAL: | |
2282 | case SETALL: | |
2283 | case IPC_RMID: | |
2284 | case IPC_SET: | |
2285 | may = MAY_READWRITE; | |
2286 | break; | |
2287 | case IPC_INFO: | |
2288 | case SEM_INFO: | |
2289 | /* | |
2290 | * System level information | |
2291 | */ | |
2292 | return 0; | |
2293 | default: | |
2294 | return -EINVAL; | |
2295 | } | |
2296 | ||
ecfcc53f | 2297 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2298 | } |
2299 | ||
2300 | /** | |
2301 | * smack_sem_semop - Smack checks of semaphore operations | |
2302 | * @sma: the object | |
2303 | * @sops: unused | |
2304 | * @nsops: unused | |
2305 | * @alter: unused | |
2306 | * | |
2307 | * Treated as read and write in all cases. | |
2308 | * | |
2309 | * Returns 0 if access is allowed, error code otherwise | |
2310 | */ | |
2311 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2312 | unsigned nsops, int alter) | |
2313 | { | |
ecfcc53f | 2314 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2315 | } |
2316 | ||
2317 | /** | |
2318 | * smack_msg_alloc_security - Set the security blob for msg | |
2319 | * @msq: the object | |
2320 | * | |
2321 | * Returns 0 | |
2322 | */ | |
2323 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2324 | { | |
2325 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2326 | ||
676dac4b | 2327 | kisp->security = smk_of_current(); |
e114e473 CS |
2328 | return 0; |
2329 | } | |
2330 | ||
2331 | /** | |
2332 | * smack_msg_free_security - Clear the security blob for msg | |
2333 | * @msq: the object | |
2334 | * | |
2335 | * Clears the blob pointer | |
2336 | */ | |
2337 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2338 | { | |
2339 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2340 | ||
2341 | kisp->security = NULL; | |
2342 | } | |
2343 | ||
2344 | /** | |
2345 | * smack_of_msq - the smack pointer for the msq | |
2346 | * @msq: the object | |
2347 | * | |
2348 | * Returns a pointer to the smack value | |
2349 | */ | |
2350 | static char *smack_of_msq(struct msg_queue *msq) | |
2351 | { | |
2352 | return (char *)msq->q_perm.security; | |
2353 | } | |
2354 | ||
ecfcc53f EB |
2355 | /** |
2356 | * smk_curacc_msq : helper to check if current has access on msq | |
2357 | * @msq : the msq | |
2358 | * @access : access requested | |
2359 | * | |
2360 | * return 0 if current has access, error otherwise | |
2361 | */ | |
2362 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2363 | { | |
2364 | char *msp = smack_of_msq(msq); | |
2365 | struct smk_audit_info ad; | |
2366 | ||
2367 | #ifdef CONFIG_AUDIT | |
2368 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2369 | ad.a.u.ipc_id = msq->q_perm.id; | |
2370 | #endif | |
2371 | return smk_curacc(msp, access, &ad); | |
2372 | } | |
2373 | ||
e114e473 CS |
2374 | /** |
2375 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2376 | * @msq: the object | |
2377 | * @msqflg: access requested | |
2378 | * | |
2379 | * Returns 0 if current has the requested access, error code otherwise | |
2380 | */ | |
2381 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2382 | { | |
e114e473 CS |
2383 | int may; |
2384 | ||
2385 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2386 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2387 | } |
2388 | ||
2389 | /** | |
2390 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2391 | * @msq: the object | |
2392 | * @cmd: what it wants to do | |
2393 | * | |
2394 | * Returns 0 if current has the requested access, error code otherwise | |
2395 | */ | |
2396 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2397 | { | |
e114e473 CS |
2398 | int may; |
2399 | ||
2400 | switch (cmd) { | |
2401 | case IPC_STAT: | |
2402 | case MSG_STAT: | |
2403 | may = MAY_READ; | |
2404 | break; | |
2405 | case IPC_SET: | |
2406 | case IPC_RMID: | |
2407 | may = MAY_READWRITE; | |
2408 | break; | |
2409 | case IPC_INFO: | |
2410 | case MSG_INFO: | |
2411 | /* | |
2412 | * System level information | |
2413 | */ | |
2414 | return 0; | |
2415 | default: | |
2416 | return -EINVAL; | |
2417 | } | |
2418 | ||
ecfcc53f | 2419 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2420 | } |
2421 | ||
2422 | /** | |
2423 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2424 | * @msq: the object | |
2425 | * @msg: unused | |
2426 | * @msqflg: access requested | |
2427 | * | |
2428 | * Returns 0 if current has the requested access, error code otherwise | |
2429 | */ | |
2430 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2431 | int msqflg) | |
2432 | { | |
ecfcc53f | 2433 | int may; |
e114e473 | 2434 | |
ecfcc53f EB |
2435 | may = smack_flags_to_may(msqflg); |
2436 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2437 | } |
2438 | ||
2439 | /** | |
2440 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2441 | * @msq: the object | |
2442 | * @msg: unused | |
2443 | * @target: unused | |
2444 | * @type: unused | |
2445 | * @mode: unused | |
2446 | * | |
2447 | * Returns 0 if current has read and write access, error code otherwise | |
2448 | */ | |
2449 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2450 | struct task_struct *target, long type, int mode) | |
2451 | { | |
ecfcc53f | 2452 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2453 | } |
2454 | ||
2455 | /** | |
2456 | * smack_ipc_permission - Smack access for ipc_permission() | |
2457 | * @ipp: the object permissions | |
2458 | * @flag: access requested | |
2459 | * | |
2460 | * Returns 0 if current has read and write access, error code otherwise | |
2461 | */ | |
2462 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2463 | { | |
2464 | char *isp = ipp->security; | |
ecfcc53f EB |
2465 | int may = smack_flags_to_may(flag); |
2466 | struct smk_audit_info ad; | |
e114e473 | 2467 | |
ecfcc53f EB |
2468 | #ifdef CONFIG_AUDIT |
2469 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2470 | ad.a.u.ipc_id = ipp->id; | |
2471 | #endif | |
2472 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2473 | } |
2474 | ||
d20bdda6 AD |
2475 | /** |
2476 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2477 | * @ipp: the object permissions |
d20bdda6 AD |
2478 | * @secid: where result will be saved |
2479 | */ | |
2480 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2481 | { | |
2482 | char *smack = ipp->security; | |
2483 | ||
2484 | *secid = smack_to_secid(smack); | |
2485 | } | |
2486 | ||
e114e473 CS |
2487 | /** |
2488 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2489 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2490 | * @inode: the object |
2491 | * | |
2492 | * Set the inode's security blob if it hasn't been done already. | |
2493 | */ | |
2494 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2495 | { | |
2496 | struct super_block *sbp; | |
2497 | struct superblock_smack *sbsp; | |
2498 | struct inode_smack *isp; | |
676dac4b | 2499 | char *csp = smk_of_current(); |
e114e473 CS |
2500 | char *fetched; |
2501 | char *final; | |
5c6d1125 JS |
2502 | char trattr[TRANS_TRUE_SIZE]; |
2503 | int transflag = 0; | |
2267b13a | 2504 | int rc; |
e114e473 CS |
2505 | struct dentry *dp; |
2506 | ||
2507 | if (inode == NULL) | |
2508 | return; | |
2509 | ||
2510 | isp = inode->i_security; | |
2511 | ||
2512 | mutex_lock(&isp->smk_lock); | |
2513 | /* | |
2514 | * If the inode is already instantiated | |
2515 | * take the quick way out | |
2516 | */ | |
2517 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2518 | goto unlockandout; | |
2519 | ||
2520 | sbp = inode->i_sb; | |
2521 | sbsp = sbp->s_security; | |
2522 | /* | |
2523 | * We're going to use the superblock default label | |
2524 | * if there's no label on the file. | |
2525 | */ | |
2526 | final = sbsp->smk_default; | |
2527 | ||
e97dcb0e CS |
2528 | /* |
2529 | * If this is the root inode the superblock | |
2530 | * may be in the process of initialization. | |
2531 | * If that is the case use the root value out | |
2532 | * of the superblock. | |
2533 | */ | |
2534 | if (opt_dentry->d_parent == opt_dentry) { | |
2535 | isp->smk_inode = sbsp->smk_root; | |
2536 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2537 | goto unlockandout; | |
2538 | } | |
2539 | ||
e114e473 CS |
2540 | /* |
2541 | * This is pretty hackish. | |
2542 | * Casey says that we shouldn't have to do | |
2543 | * file system specific code, but it does help | |
2544 | * with keeping it simple. | |
2545 | */ | |
2546 | switch (sbp->s_magic) { | |
2547 | case SMACK_MAGIC: | |
2548 | /* | |
25985edc | 2549 | * Casey says that it's a little embarrassing |
e114e473 CS |
2550 | * that the smack file system doesn't do |
2551 | * extended attributes. | |
2552 | */ | |
2553 | final = smack_known_star.smk_known; | |
2554 | break; | |
2555 | case PIPEFS_MAGIC: | |
2556 | /* | |
2557 | * Casey says pipes are easy (?) | |
2558 | */ | |
2559 | final = smack_known_star.smk_known; | |
2560 | break; | |
2561 | case DEVPTS_SUPER_MAGIC: | |
2562 | /* | |
2563 | * devpts seems content with the label of the task. | |
2564 | * Programs that change smack have to treat the | |
2565 | * pty with respect. | |
2566 | */ | |
2567 | final = csp; | |
2568 | break; | |
2569 | case SOCKFS_MAGIC: | |
2570 | /* | |
b4e0d5f0 CS |
2571 | * Socket access is controlled by the socket |
2572 | * structures associated with the task involved. | |
e114e473 | 2573 | */ |
b4e0d5f0 | 2574 | final = smack_known_star.smk_known; |
e114e473 CS |
2575 | break; |
2576 | case PROC_SUPER_MAGIC: | |
2577 | /* | |
2578 | * Casey says procfs appears not to care. | |
2579 | * The superblock default suffices. | |
2580 | */ | |
2581 | break; | |
2582 | case TMPFS_MAGIC: | |
2583 | /* | |
2584 | * Device labels should come from the filesystem, | |
2585 | * but watch out, because they're volitile, | |
2586 | * getting recreated on every reboot. | |
2587 | */ | |
2588 | final = smack_known_star.smk_known; | |
2589 | /* | |
2590 | * No break. | |
2591 | * | |
2592 | * If a smack value has been set we want to use it, | |
2593 | * but since tmpfs isn't giving us the opportunity | |
2594 | * to set mount options simulate setting the | |
2595 | * superblock default. | |
2596 | */ | |
2597 | default: | |
2598 | /* | |
2599 | * This isn't an understood special case. | |
2600 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2601 | */ |
2602 | ||
2603 | /* | |
2604 | * UNIX domain sockets use lower level socket data. | |
2605 | */ | |
2606 | if (S_ISSOCK(inode->i_mode)) { | |
2607 | final = smack_known_star.smk_known; | |
2608 | break; | |
2609 | } | |
2610 | /* | |
e114e473 CS |
2611 | * No xattr support means, alas, no SMACK label. |
2612 | * Use the aforeapplied default. | |
2613 | * It would be curious if the label of the task | |
2614 | * does not match that assigned. | |
2615 | */ | |
2616 | if (inode->i_op->getxattr == NULL) | |
2617 | break; | |
2618 | /* | |
2619 | * Get the dentry for xattr. | |
2620 | */ | |
3e62cbb8 | 2621 | dp = dget(opt_dentry); |
676dac4b | 2622 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
2267b13a | 2623 | if (fetched != NULL) |
e114e473 | 2624 | final = fetched; |
2267b13a CS |
2625 | |
2626 | /* | |
2627 | * Transmuting directory | |
2628 | */ | |
2629 | if (S_ISDIR(inode->i_mode)) { | |
2630 | /* | |
2631 | * If this is a new directory and the label was | |
2632 | * transmuted when the inode was initialized | |
2633 | * set the transmute attribute on the directory | |
2634 | * and mark the inode. | |
2635 | * | |
2636 | * If there is a transmute attribute on the | |
2637 | * directory mark the inode. | |
2638 | */ | |
2639 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
2640 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
2641 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 2642 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
2643 | TRANS_TRUE, TRANS_TRUE_SIZE, |
2644 | 0); | |
2645 | } else { | |
2646 | rc = inode->i_op->getxattr(dp, | |
2647 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
2648 | TRANS_TRUE_SIZE); | |
2649 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
2650 | TRANS_TRUE_SIZE) != 0) | |
2651 | rc = -EINVAL; | |
5c6d1125 | 2652 | } |
2267b13a CS |
2653 | if (rc >= 0) |
2654 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 JS |
2655 | } |
2656 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2657 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2658 | |
e114e473 CS |
2659 | dput(dp); |
2660 | break; | |
2661 | } | |
2662 | ||
2663 | if (final == NULL) | |
2664 | isp->smk_inode = csp; | |
2665 | else | |
2666 | isp->smk_inode = final; | |
2667 | ||
5c6d1125 | 2668 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2669 | |
2670 | unlockandout: | |
2671 | mutex_unlock(&isp->smk_lock); | |
2672 | return; | |
2673 | } | |
2674 | ||
2675 | /** | |
2676 | * smack_getprocattr - Smack process attribute access | |
2677 | * @p: the object task | |
2678 | * @name: the name of the attribute in /proc/.../attr | |
2679 | * @value: where to put the result | |
2680 | * | |
2681 | * Places a copy of the task Smack into value | |
2682 | * | |
2683 | * Returns the length of the smack label or an error code | |
2684 | */ | |
2685 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2686 | { | |
2687 | char *cp; | |
2688 | int slen; | |
2689 | ||
2690 | if (strcmp(name, "current") != 0) | |
2691 | return -EINVAL; | |
2692 | ||
676dac4b | 2693 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2694 | if (cp == NULL) |
2695 | return -ENOMEM; | |
2696 | ||
2697 | slen = strlen(cp); | |
2698 | *value = cp; | |
2699 | return slen; | |
2700 | } | |
2701 | ||
2702 | /** | |
2703 | * smack_setprocattr - Smack process attribute setting | |
2704 | * @p: the object task | |
2705 | * @name: the name of the attribute in /proc/.../attr | |
2706 | * @value: the value to set | |
2707 | * @size: the size of the value | |
2708 | * | |
2709 | * Sets the Smack value of the task. Only setting self | |
2710 | * is permitted and only with privilege | |
2711 | * | |
2712 | * Returns the length of the smack label or an error code | |
2713 | */ | |
2714 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2715 | void *value, size_t size) | |
2716 | { | |
7898e1f8 | 2717 | int rc; |
676dac4b | 2718 | struct task_smack *tsp; |
5c6d1125 | 2719 | struct task_smack *oldtsp; |
d84f4f99 | 2720 | struct cred *new; |
e114e473 CS |
2721 | char *newsmack; |
2722 | ||
e114e473 CS |
2723 | /* |
2724 | * Changing another process' Smack value is too dangerous | |
2725 | * and supports no sane use case. | |
2726 | */ | |
2727 | if (p != current) | |
2728 | return -EPERM; | |
2729 | ||
5cd9c58f DH |
2730 | if (!capable(CAP_MAC_ADMIN)) |
2731 | return -EPERM; | |
2732 | ||
f7112e6c | 2733 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
2734 | return -EINVAL; |
2735 | ||
2736 | if (strcmp(name, "current") != 0) | |
2737 | return -EINVAL; | |
2738 | ||
2739 | newsmack = smk_import(value, size); | |
2740 | if (newsmack == NULL) | |
2741 | return -EINVAL; | |
2742 | ||
6d3dc07c CS |
2743 | /* |
2744 | * No process is ever allowed the web ("@") label. | |
2745 | */ | |
2746 | if (newsmack == smack_known_web.smk_known) | |
2747 | return -EPERM; | |
2748 | ||
5c6d1125 | 2749 | oldtsp = p->cred->security; |
d84f4f99 | 2750 | new = prepare_creds(); |
6d3dc07c | 2751 | if (new == NULL) |
d84f4f99 | 2752 | return -ENOMEM; |
7898e1f8 CS |
2753 | |
2754 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2755 | if (tsp == NULL) { |
2756 | kfree(new); | |
2757 | return -ENOMEM; | |
2758 | } | |
7898e1f8 CS |
2759 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2760 | if (rc != 0) | |
2761 | return rc; | |
2762 | ||
676dac4b | 2763 | new->security = tsp; |
d84f4f99 | 2764 | commit_creds(new); |
e114e473 CS |
2765 | return size; |
2766 | } | |
2767 | ||
2768 | /** | |
2769 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2770 | * @sock: one sock |
2771 | * @other: the other sock | |
e114e473 CS |
2772 | * @newsk: unused |
2773 | * | |
2774 | * Return 0 if a subject with the smack of sock could access | |
2775 | * an object with the smack of other, otherwise an error code | |
2776 | */ | |
3610cda5 DM |
2777 | static int smack_unix_stream_connect(struct sock *sock, |
2778 | struct sock *other, struct sock *newsk) | |
e114e473 | 2779 | { |
d2e7ad19 JM |
2780 | struct socket_smack *ssp = sock->sk_security; |
2781 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2782 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2783 | struct smk_audit_info ad; |
b4e0d5f0 | 2784 | int rc = 0; |
e114e473 | 2785 | |
923e9a13 KC |
2786 | #ifdef CONFIG_AUDIT |
2787 | struct lsm_network_audit net; | |
2788 | ||
48c62af6 | 2789 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3610cda5 | 2790 | smk_ad_setfield_u_net_sk(&ad, other); |
923e9a13 | 2791 | #endif |
b4e0d5f0 CS |
2792 | |
2793 | if (!capable(CAP_MAC_OVERRIDE)) | |
2794 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2795 | ||
975d5e55 CS |
2796 | /* |
2797 | * Cross reference the peer labels for SO_PEERSEC. | |
2798 | */ | |
2799 | if (rc == 0) { | |
2800 | nsp->smk_packet = ssp->smk_out; | |
2801 | ssp->smk_packet = osp->smk_out; | |
2802 | } | |
2803 | ||
b4e0d5f0 | 2804 | return rc; |
e114e473 CS |
2805 | } |
2806 | ||
2807 | /** | |
2808 | * smack_unix_may_send - Smack access on UDS | |
2809 | * @sock: one socket | |
2810 | * @other: the other socket | |
2811 | * | |
2812 | * Return 0 if a subject with the smack of sock could access | |
2813 | * an object with the smack of other, otherwise an error code | |
2814 | */ | |
2815 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2816 | { | |
b4e0d5f0 CS |
2817 | struct socket_smack *ssp = sock->sk->sk_security; |
2818 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2819 | struct smk_audit_info ad; |
b4e0d5f0 | 2820 | int rc = 0; |
e114e473 | 2821 | |
923e9a13 KC |
2822 | #ifdef CONFIG_AUDIT |
2823 | struct lsm_network_audit net; | |
2824 | ||
48c62af6 | 2825 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 2826 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 2827 | #endif |
b4e0d5f0 CS |
2828 | |
2829 | if (!capable(CAP_MAC_OVERRIDE)) | |
2830 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2831 | ||
2832 | return rc; | |
e114e473 CS |
2833 | } |
2834 | ||
6d3dc07c CS |
2835 | /** |
2836 | * smack_socket_sendmsg - Smack check based on destination host | |
2837 | * @sock: the socket | |
251a2a95 | 2838 | * @msg: the message |
6d3dc07c CS |
2839 | * @size: the size of the message |
2840 | * | |
2841 | * Return 0 if the current subject can write to the destination | |
2842 | * host. This is only a question if the destination is a single | |
2843 | * label host. | |
2844 | */ | |
2845 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2846 | int size) | |
2847 | { | |
2848 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2849 | |
2850 | /* | |
2851 | * Perfectly reasonable for this to be NULL | |
2852 | */ | |
da34d424 | 2853 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2854 | return 0; |
2855 | ||
07feee8f | 2856 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2857 | } |
2858 | ||
e114e473 | 2859 | /** |
251a2a95 | 2860 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 2861 | * @sap: netlabel secattr |
272cd7a8 | 2862 | * @ssp: socket security information |
e114e473 | 2863 | * |
272cd7a8 | 2864 | * Returns a pointer to a Smack label found on the label list. |
e114e473 | 2865 | */ |
272cd7a8 CS |
2866 | static char *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
2867 | struct socket_smack *ssp) | |
e114e473 | 2868 | { |
f7112e6c | 2869 | struct smack_known *kp; |
6d3dc07c | 2870 | char *sp; |
f7112e6c | 2871 | int found = 0; |
e114e473 | 2872 | |
6d3dc07c | 2873 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2874 | /* |
6d3dc07c | 2875 | * Looks like a CIPSO packet. |
e114e473 CS |
2876 | * If there are flags but no level netlabel isn't |
2877 | * behaving the way we expect it to. | |
2878 | * | |
f7112e6c | 2879 | * Look it up in the label table |
e114e473 CS |
2880 | * Without guidance regarding the smack value |
2881 | * for the packet fall back on the network | |
2882 | * ambient value. | |
2883 | */ | |
f7112e6c CS |
2884 | rcu_read_lock(); |
2885 | list_for_each_entry(kp, &smack_known_list, list) { | |
2886 | if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl) | |
2887 | continue; | |
2888 | if (memcmp(sap->attr.mls.cat, | |
2889 | kp->smk_netlabel.attr.mls.cat, | |
2890 | SMK_CIPSOLEN) != 0) | |
2891 | continue; | |
2892 | found = 1; | |
2893 | break; | |
6d3dc07c | 2894 | } |
f7112e6c CS |
2895 | rcu_read_unlock(); |
2896 | ||
2897 | if (found) | |
2898 | return kp->smk_known; | |
2899 | ||
272cd7a8 CS |
2900 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) |
2901 | return smack_known_web.smk_known; | |
2902 | return smack_known_star.smk_known; | |
e114e473 | 2903 | } |
6d3dc07c CS |
2904 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2905 | /* | |
2906 | * Looks like a fallback, which gives us a secid. | |
2907 | */ | |
2908 | sp = smack_from_secid(sap->attr.secid); | |
2909 | /* | |
2910 | * This has got to be a bug because it is | |
2911 | * impossible to specify a fallback without | |
2912 | * specifying the label, which will ensure | |
2913 | * it has a secid, and the only way to get a | |
2914 | * secid is from a fallback. | |
2915 | */ | |
2916 | BUG_ON(sp == NULL); | |
272cd7a8 | 2917 | return sp; |
e114e473 CS |
2918 | } |
2919 | /* | |
6d3dc07c CS |
2920 | * Without guidance regarding the smack value |
2921 | * for the packet fall back on the network | |
2922 | * ambient value. | |
e114e473 | 2923 | */ |
272cd7a8 | 2924 | return smack_net_ambient; |
e114e473 CS |
2925 | } |
2926 | ||
2927 | /** | |
2928 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2929 | * @sk: socket | |
2930 | * @skb: packet | |
2931 | * | |
2932 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2933 | */ | |
2934 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2935 | { | |
2936 | struct netlbl_lsm_secattr secattr; | |
2937 | struct socket_smack *ssp = sk->sk_security; | |
6d3dc07c | 2938 | char *csp; |
e114e473 | 2939 | int rc; |
ecfcc53f | 2940 | struct smk_audit_info ad; |
923e9a13 | 2941 | #ifdef CONFIG_AUDIT |
48c62af6 | 2942 | struct lsm_network_audit net; |
923e9a13 | 2943 | #endif |
e114e473 CS |
2944 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2945 | return 0; | |
2946 | ||
2947 | /* | |
2948 | * Translate what netlabel gave us. | |
2949 | */ | |
e114e473 | 2950 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2951 | |
e114e473 | 2952 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
272cd7a8 CS |
2953 | if (rc == 0) |
2954 | csp = smack_from_secattr(&secattr, ssp); | |
2955 | else | |
6d3dc07c CS |
2956 | csp = smack_net_ambient; |
2957 | ||
e114e473 | 2958 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2959 | |
ecfcc53f | 2960 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
2961 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2962 | ad.a.u.net->family = sk->sk_family; | |
2963 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
2964 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2965 | #endif | |
e114e473 CS |
2966 | /* |
2967 | * Receiving a packet requires that the other end | |
2968 | * be able to write here. Read access is not required. | |
2969 | * This is the simplist possible security model | |
2970 | * for networking. | |
2971 | */ | |
ecfcc53f | 2972 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2973 | if (rc != 0) |
2974 | netlbl_skbuff_err(skb, rc, 0); | |
2975 | return rc; | |
e114e473 CS |
2976 | } |
2977 | ||
2978 | /** | |
2979 | * smack_socket_getpeersec_stream - pull in packet label | |
2980 | * @sock: the socket | |
2981 | * @optval: user's destination | |
2982 | * @optlen: size thereof | |
251a2a95 | 2983 | * @len: max thereof |
e114e473 CS |
2984 | * |
2985 | * returns zero on success, an error code otherwise | |
2986 | */ | |
2987 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2988 | char __user *optval, | |
2989 | int __user *optlen, unsigned len) | |
2990 | { | |
2991 | struct socket_smack *ssp; | |
272cd7a8 CS |
2992 | char *rcp = ""; |
2993 | int slen = 1; | |
e114e473 CS |
2994 | int rc = 0; |
2995 | ||
2996 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
2997 | if (ssp->smk_packet != NULL) { |
2998 | rcp = ssp->smk_packet; | |
2999 | slen = strlen(rcp) + 1; | |
3000 | } | |
e114e473 CS |
3001 | |
3002 | if (slen > len) | |
3003 | rc = -ERANGE; | |
272cd7a8 | 3004 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3005 | rc = -EFAULT; |
3006 | ||
3007 | if (put_user(slen, optlen) != 0) | |
3008 | rc = -EFAULT; | |
3009 | ||
3010 | return rc; | |
3011 | } | |
3012 | ||
3013 | ||
3014 | /** | |
3015 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3016 | * @sock: the peer socket |
e114e473 CS |
3017 | * @skb: packet data |
3018 | * @secid: pointer to where to put the secid of the packet | |
3019 | * | |
3020 | * Sets the netlabel socket state on sk from parent | |
3021 | */ | |
3022 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3023 | struct sk_buff *skb, u32 *secid) | |
3024 | ||
3025 | { | |
3026 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 CS |
3027 | struct socket_smack *ssp = NULL; |
3028 | char *sp; | |
b4e0d5f0 CS |
3029 | int family = PF_UNSPEC; |
3030 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3031 | int rc; |
3032 | ||
b4e0d5f0 CS |
3033 | if (skb != NULL) { |
3034 | if (skb->protocol == htons(ETH_P_IP)) | |
3035 | family = PF_INET; | |
3036 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3037 | family = PF_INET6; | |
e114e473 | 3038 | } |
b4e0d5f0 CS |
3039 | if (family == PF_UNSPEC && sock != NULL) |
3040 | family = sock->sk->sk_family; | |
e114e473 | 3041 | |
b4e0d5f0 | 3042 | if (family == PF_UNIX) { |
272cd7a8 CS |
3043 | ssp = sock->sk->sk_security; |
3044 | s = smack_to_secid(ssp->smk_out); | |
b4e0d5f0 CS |
3045 | } else if (family == PF_INET || family == PF_INET6) { |
3046 | /* | |
3047 | * Translate what netlabel gave us. | |
3048 | */ | |
272cd7a8 CS |
3049 | if (sock != NULL && sock->sk != NULL) |
3050 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3051 | netlbl_secattr_init(&secattr); |
3052 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3053 | if (rc == 0) { | |
272cd7a8 CS |
3054 | sp = smack_from_secattr(&secattr, ssp); |
3055 | s = smack_to_secid(sp); | |
b4e0d5f0 CS |
3056 | } |
3057 | netlbl_secattr_destroy(&secattr); | |
3058 | } | |
3059 | *secid = s; | |
e114e473 CS |
3060 | if (s == 0) |
3061 | return -EINVAL; | |
e114e473 CS |
3062 | return 0; |
3063 | } | |
3064 | ||
3065 | /** | |
07feee8f PM |
3066 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3067 | * @sk: child sock | |
3068 | * @parent: parent socket | |
e114e473 | 3069 | * |
07feee8f PM |
3070 | * Set the smk_{in,out} state of an existing sock based on the process that |
3071 | * is creating the new socket. | |
e114e473 CS |
3072 | */ |
3073 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3074 | { | |
3075 | struct socket_smack *ssp; | |
e114e473 | 3076 | |
07feee8f PM |
3077 | if (sk == NULL || |
3078 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3079 | return; |
3080 | ||
3081 | ssp = sk->sk_security; | |
676dac4b | 3082 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3083 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3084 | } |
3085 | ||
3086 | /** | |
3087 | * smack_inet_conn_request - Smack access check on connect | |
3088 | * @sk: socket involved | |
3089 | * @skb: packet | |
3090 | * @req: unused | |
3091 | * | |
3092 | * Returns 0 if a task with the packet label could write to | |
3093 | * the socket, otherwise an error code | |
3094 | */ | |
3095 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3096 | struct request_sock *req) | |
3097 | { | |
07feee8f | 3098 | u16 family = sk->sk_family; |
f7112e6c | 3099 | struct smack_known *skp; |
e114e473 | 3100 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3101 | struct netlbl_lsm_secattr secattr; |
3102 | struct sockaddr_in addr; | |
3103 | struct iphdr *hdr; | |
272cd7a8 | 3104 | char *sp; |
f7112e6c | 3105 | char *hsp; |
e114e473 | 3106 | int rc; |
ecfcc53f | 3107 | struct smk_audit_info ad; |
923e9a13 | 3108 | #ifdef CONFIG_AUDIT |
48c62af6 | 3109 | struct lsm_network_audit net; |
923e9a13 | 3110 | #endif |
e114e473 | 3111 | |
07feee8f PM |
3112 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3113 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3114 | family = PF_INET; | |
e114e473 | 3115 | |
07feee8f PM |
3116 | netlbl_secattr_init(&secattr); |
3117 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3118 | if (rc == 0) |
272cd7a8 | 3119 | sp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3120 | else |
272cd7a8 | 3121 | sp = smack_known_huh.smk_known; |
07feee8f PM |
3122 | netlbl_secattr_destroy(&secattr); |
3123 | ||
ecfcc53f | 3124 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3125 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3126 | ad.a.u.net->family = family; | |
3127 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3128 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3129 | #endif | |
e114e473 | 3130 | /* |
07feee8f PM |
3131 | * Receiving a packet requires that the other end be able to write |
3132 | * here. Read access is not required. | |
e114e473 | 3133 | */ |
272cd7a8 | 3134 | rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3135 | if (rc != 0) |
3136 | return rc; | |
3137 | ||
3138 | /* | |
3139 | * Save the peer's label in the request_sock so we can later setup | |
3140 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3141 | */ | |
272cd7a8 | 3142 | req->peer_secid = smack_to_secid(sp); |
07feee8f PM |
3143 | |
3144 | /* | |
3145 | * We need to decide if we want to label the incoming connection here | |
3146 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3147 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3148 | */ |
3149 | hdr = ip_hdr(skb); | |
3150 | addr.sin_addr.s_addr = hdr->saddr; | |
3151 | rcu_read_lock(); | |
f7112e6c CS |
3152 | hsp = smack_host_label(&addr); |
3153 | rcu_read_unlock(); | |
3154 | ||
3155 | if (hsp == NULL) { | |
3156 | skp = smk_find_entry(sp); | |
3157 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); | |
3158 | } else | |
07feee8f | 3159 | netlbl_req_delattr(req); |
e114e473 CS |
3160 | |
3161 | return rc; | |
3162 | } | |
3163 | ||
07feee8f PM |
3164 | /** |
3165 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3166 | * @sk: the new socket | |
3167 | * @req: the connection's request_sock | |
3168 | * | |
3169 | * Transfer the connection's peer label to the newly created socket. | |
3170 | */ | |
3171 | static void smack_inet_csk_clone(struct sock *sk, | |
3172 | const struct request_sock *req) | |
3173 | { | |
3174 | struct socket_smack *ssp = sk->sk_security; | |
07feee8f | 3175 | |
272cd7a8 CS |
3176 | if (req->peer_secid != 0) |
3177 | ssp->smk_packet = smack_from_secid(req->peer_secid); | |
3178 | else | |
3179 | ssp->smk_packet = NULL; | |
07feee8f PM |
3180 | } |
3181 | ||
e114e473 CS |
3182 | /* |
3183 | * Key management security hooks | |
3184 | * | |
3185 | * Casey has not tested key support very heavily. | |
3186 | * The permission check is most likely too restrictive. | |
3187 | * If you care about keys please have a look. | |
3188 | */ | |
3189 | #ifdef CONFIG_KEYS | |
3190 | ||
3191 | /** | |
3192 | * smack_key_alloc - Set the key security blob | |
3193 | * @key: object | |
d84f4f99 | 3194 | * @cred: the credentials to use |
e114e473 CS |
3195 | * @flags: unused |
3196 | * | |
3197 | * No allocation required | |
3198 | * | |
3199 | * Returns 0 | |
3200 | */ | |
d84f4f99 | 3201 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3202 | unsigned long flags) |
3203 | { | |
676dac4b | 3204 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3205 | return 0; |
3206 | } | |
3207 | ||
3208 | /** | |
3209 | * smack_key_free - Clear the key security blob | |
3210 | * @key: the object | |
3211 | * | |
3212 | * Clear the blob pointer | |
3213 | */ | |
3214 | static void smack_key_free(struct key *key) | |
3215 | { | |
3216 | key->security = NULL; | |
3217 | } | |
3218 | ||
3219 | /* | |
3220 | * smack_key_permission - Smack access on a key | |
3221 | * @key_ref: gets to the object | |
d84f4f99 | 3222 | * @cred: the credentials to use |
e114e473 CS |
3223 | * @perm: unused |
3224 | * | |
3225 | * Return 0 if the task has read and write to the object, | |
3226 | * an error code otherwise | |
3227 | */ | |
3228 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3229 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3230 | { |
3231 | struct key *keyp; | |
ecfcc53f | 3232 | struct smk_audit_info ad; |
676dac4b | 3233 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3234 | |
3235 | keyp = key_ref_to_ptr(key_ref); | |
3236 | if (keyp == NULL) | |
3237 | return -EINVAL; | |
3238 | /* | |
3239 | * If the key hasn't been initialized give it access so that | |
3240 | * it may do so. | |
3241 | */ | |
3242 | if (keyp->security == NULL) | |
3243 | return 0; | |
3244 | /* | |
3245 | * This should not occur | |
3246 | */ | |
676dac4b | 3247 | if (tsp == NULL) |
e114e473 | 3248 | return -EACCES; |
ecfcc53f EB |
3249 | #ifdef CONFIG_AUDIT |
3250 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3251 | ad.a.u.key_struct.key = keyp->serial; | |
3252 | ad.a.u.key_struct.key_desc = keyp->description; | |
3253 | #endif | |
676dac4b | 3254 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3255 | MAY_READWRITE, &ad); |
e114e473 CS |
3256 | } |
3257 | #endif /* CONFIG_KEYS */ | |
3258 | ||
d20bdda6 AD |
3259 | /* |
3260 | * Smack Audit hooks | |
3261 | * | |
3262 | * Audit requires a unique representation of each Smack specific | |
3263 | * rule. This unique representation is used to distinguish the | |
3264 | * object to be audited from remaining kernel objects and also | |
3265 | * works as a glue between the audit hooks. | |
3266 | * | |
3267 | * Since repository entries are added but never deleted, we'll use | |
3268 | * the smack_known label address related to the given audit rule as | |
3269 | * the needed unique representation. This also better fits the smack | |
3270 | * model where nearly everything is a label. | |
3271 | */ | |
3272 | #ifdef CONFIG_AUDIT | |
3273 | ||
3274 | /** | |
3275 | * smack_audit_rule_init - Initialize a smack audit rule | |
3276 | * @field: audit rule fields given from user-space (audit.h) | |
3277 | * @op: required testing operator (=, !=, >, <, ...) | |
3278 | * @rulestr: smack label to be audited | |
3279 | * @vrule: pointer to save our own audit rule representation | |
3280 | * | |
3281 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3282 | * The label to be audited is created if necessay. | |
3283 | */ | |
3284 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3285 | { | |
3286 | char **rule = (char **)vrule; | |
3287 | *rule = NULL; | |
3288 | ||
3289 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3290 | return -EINVAL; | |
3291 | ||
5af75d8d | 3292 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3293 | return -EINVAL; |
3294 | ||
3295 | *rule = smk_import(rulestr, 0); | |
3296 | ||
3297 | return 0; | |
3298 | } | |
3299 | ||
3300 | /** | |
3301 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3302 | * @krule: rule of interest, in Audit kernel representation format | |
3303 | * | |
3304 | * This is used to filter Smack rules from remaining Audit ones. | |
3305 | * If it's proved that this rule belongs to us, the | |
3306 | * audit_rule_match hook will be called to do the final judgement. | |
3307 | */ | |
3308 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3309 | { | |
3310 | struct audit_field *f; | |
3311 | int i; | |
3312 | ||
3313 | for (i = 0; i < krule->field_count; i++) { | |
3314 | f = &krule->fields[i]; | |
3315 | ||
3316 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3317 | return 1; | |
3318 | } | |
3319 | ||
3320 | return 0; | |
3321 | } | |
3322 | ||
3323 | /** | |
3324 | * smack_audit_rule_match - Audit given object ? | |
3325 | * @secid: security id for identifying the object to test | |
3326 | * @field: audit rule flags given from user-space | |
3327 | * @op: required testing operator | |
3328 | * @vrule: smack internal rule presentation | |
3329 | * @actx: audit context associated with the check | |
3330 | * | |
3331 | * The core Audit hook. It's used to take the decision of | |
3332 | * whether to audit or not to audit a given object. | |
3333 | */ | |
3334 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3335 | struct audit_context *actx) | |
3336 | { | |
3337 | char *smack; | |
3338 | char *rule = vrule; | |
3339 | ||
3340 | if (!rule) { | |
ceffec55 | 3341 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
d20bdda6 AD |
3342 | "Smack: missing rule\n"); |
3343 | return -ENOENT; | |
3344 | } | |
3345 | ||
3346 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3347 | return 0; | |
3348 | ||
3349 | smack = smack_from_secid(secid); | |
3350 | ||
3351 | /* | |
3352 | * No need to do string comparisons. If a match occurs, | |
3353 | * both pointers will point to the same smack_known | |
3354 | * label. | |
3355 | */ | |
5af75d8d | 3356 | if (op == Audit_equal) |
d20bdda6 | 3357 | return (rule == smack); |
5af75d8d | 3358 | if (op == Audit_not_equal) |
d20bdda6 AD |
3359 | return (rule != smack); |
3360 | ||
3361 | return 0; | |
3362 | } | |
3363 | ||
3364 | /** | |
3365 | * smack_audit_rule_free - free smack rule representation | |
3366 | * @vrule: rule to be freed. | |
3367 | * | |
3368 | * No memory was allocated. | |
3369 | */ | |
3370 | static void smack_audit_rule_free(void *vrule) | |
3371 | { | |
3372 | /* No-op */ | |
3373 | } | |
3374 | ||
3375 | #endif /* CONFIG_AUDIT */ | |
3376 | ||
251a2a95 | 3377 | /** |
e114e473 CS |
3378 | * smack_secid_to_secctx - return the smack label for a secid |
3379 | * @secid: incoming integer | |
3380 | * @secdata: destination | |
3381 | * @seclen: how long it is | |
3382 | * | |
3383 | * Exists for networking code. | |
3384 | */ | |
3385 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3386 | { | |
3387 | char *sp = smack_from_secid(secid); | |
3388 | ||
d5630b9d EP |
3389 | if (secdata) |
3390 | *secdata = sp; | |
e114e473 CS |
3391 | *seclen = strlen(sp); |
3392 | return 0; | |
3393 | } | |
3394 | ||
251a2a95 | 3395 | /** |
4bc87e62 CS |
3396 | * smack_secctx_to_secid - return the secid for a smack label |
3397 | * @secdata: smack label | |
3398 | * @seclen: how long result is | |
3399 | * @secid: outgoing integer | |
3400 | * | |
3401 | * Exists for audit and networking code. | |
3402 | */ | |
e52c1764 | 3403 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3404 | { |
3405 | *secid = smack_to_secid(secdata); | |
3406 | return 0; | |
3407 | } | |
3408 | ||
251a2a95 | 3409 | /** |
e114e473 | 3410 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3411 | * @secdata: unused |
3412 | * @seclen: unused | |
e114e473 CS |
3413 | * |
3414 | * Exists to make sure nothing gets done, and properly | |
3415 | */ | |
3416 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3417 | { | |
3418 | } | |
3419 | ||
1ee65e37 DQ |
3420 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3421 | { | |
3422 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3423 | } | |
3424 | ||
3425 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3426 | { | |
3427 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3428 | } | |
3429 | ||
3430 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3431 | { | |
3432 | int len = 0; | |
3433 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3434 | ||
3435 | if (len < 0) | |
3436 | return len; | |
3437 | *ctxlen = len; | |
3438 | return 0; | |
3439 | } | |
3440 | ||
076c54c5 AD |
3441 | struct security_operations smack_ops = { |
3442 | .name = "smack", | |
3443 | ||
9e48858f | 3444 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3445 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3446 | .syslog = smack_syslog, |
e114e473 CS |
3447 | |
3448 | .sb_alloc_security = smack_sb_alloc_security, | |
3449 | .sb_free_security = smack_sb_free_security, | |
3450 | .sb_copy_data = smack_sb_copy_data, | |
3451 | .sb_kern_mount = smack_sb_kern_mount, | |
3452 | .sb_statfs = smack_sb_statfs, | |
3453 | .sb_mount = smack_sb_mount, | |
3454 | .sb_umount = smack_sb_umount, | |
3455 | ||
676dac4b | 3456 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3457 | .bprm_committing_creds = smack_bprm_committing_creds, |
3458 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3459 | |
e114e473 CS |
3460 | .inode_alloc_security = smack_inode_alloc_security, |
3461 | .inode_free_security = smack_inode_free_security, | |
3462 | .inode_init_security = smack_inode_init_security, | |
3463 | .inode_link = smack_inode_link, | |
3464 | .inode_unlink = smack_inode_unlink, | |
3465 | .inode_rmdir = smack_inode_rmdir, | |
3466 | .inode_rename = smack_inode_rename, | |
3467 | .inode_permission = smack_inode_permission, | |
3468 | .inode_setattr = smack_inode_setattr, | |
3469 | .inode_getattr = smack_inode_getattr, | |
3470 | .inode_setxattr = smack_inode_setxattr, | |
3471 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3472 | .inode_getxattr = smack_inode_getxattr, | |
3473 | .inode_removexattr = smack_inode_removexattr, | |
3474 | .inode_getsecurity = smack_inode_getsecurity, | |
3475 | .inode_setsecurity = smack_inode_setsecurity, | |
3476 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3477 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3478 | |
3479 | .file_permission = smack_file_permission, | |
3480 | .file_alloc_security = smack_file_alloc_security, | |
3481 | .file_free_security = smack_file_free_security, | |
3482 | .file_ioctl = smack_file_ioctl, | |
3483 | .file_lock = smack_file_lock, | |
3484 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3485 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3486 | .file_set_fowner = smack_file_set_fowner, |
3487 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3488 | .file_receive = smack_file_receive, | |
3489 | ||
531f1d45 CS |
3490 | .dentry_open = smack_dentry_open, |
3491 | ||
ee18d64c | 3492 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3493 | .cred_free = smack_cred_free, |
d84f4f99 | 3494 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3495 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3496 | .kernel_act_as = smack_kernel_act_as, |
3497 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3498 | .task_setpgid = smack_task_setpgid, |
3499 | .task_getpgid = smack_task_getpgid, | |
3500 | .task_getsid = smack_task_getsid, | |
3501 | .task_getsecid = smack_task_getsecid, | |
3502 | .task_setnice = smack_task_setnice, | |
3503 | .task_setioprio = smack_task_setioprio, | |
3504 | .task_getioprio = smack_task_getioprio, | |
3505 | .task_setscheduler = smack_task_setscheduler, | |
3506 | .task_getscheduler = smack_task_getscheduler, | |
3507 | .task_movememory = smack_task_movememory, | |
3508 | .task_kill = smack_task_kill, | |
3509 | .task_wait = smack_task_wait, | |
e114e473 CS |
3510 | .task_to_inode = smack_task_to_inode, |
3511 | ||
3512 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3513 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3514 | |
3515 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3516 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3517 | ||
3518 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3519 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3520 | .msg_queue_associate = smack_msg_queue_associate, | |
3521 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3522 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3523 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3524 | ||
3525 | .shm_alloc_security = smack_shm_alloc_security, | |
3526 | .shm_free_security = smack_shm_free_security, | |
3527 | .shm_associate = smack_shm_associate, | |
3528 | .shm_shmctl = smack_shm_shmctl, | |
3529 | .shm_shmat = smack_shm_shmat, | |
3530 | ||
3531 | .sem_alloc_security = smack_sem_alloc_security, | |
3532 | .sem_free_security = smack_sem_free_security, | |
3533 | .sem_associate = smack_sem_associate, | |
3534 | .sem_semctl = smack_sem_semctl, | |
3535 | .sem_semop = smack_sem_semop, | |
3536 | ||
e114e473 CS |
3537 | .d_instantiate = smack_d_instantiate, |
3538 | ||
3539 | .getprocattr = smack_getprocattr, | |
3540 | .setprocattr = smack_setprocattr, | |
3541 | ||
3542 | .unix_stream_connect = smack_unix_stream_connect, | |
3543 | .unix_may_send = smack_unix_may_send, | |
3544 | ||
3545 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3546 | .socket_connect = smack_socket_connect, |
3547 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3548 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3549 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3550 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3551 | .sk_alloc_security = smack_sk_alloc_security, | |
3552 | .sk_free_security = smack_sk_free_security, | |
3553 | .sock_graft = smack_sock_graft, | |
3554 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3555 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3556 | |
e114e473 CS |
3557 | /* key management security hooks */ |
3558 | #ifdef CONFIG_KEYS | |
3559 | .key_alloc = smack_key_alloc, | |
3560 | .key_free = smack_key_free, | |
3561 | .key_permission = smack_key_permission, | |
3562 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3563 | |
3564 | /* Audit hooks */ | |
3565 | #ifdef CONFIG_AUDIT | |
3566 | .audit_rule_init = smack_audit_rule_init, | |
3567 | .audit_rule_known = smack_audit_rule_known, | |
3568 | .audit_rule_match = smack_audit_rule_match, | |
3569 | .audit_rule_free = smack_audit_rule_free, | |
3570 | #endif /* CONFIG_AUDIT */ | |
3571 | ||
e114e473 | 3572 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3573 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3574 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3575 | .inode_notifysecctx = smack_inode_notifysecctx, |
3576 | .inode_setsecctx = smack_inode_setsecctx, | |
3577 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3578 | }; |
3579 | ||
7198e2ee | 3580 | |
86812bb0 | 3581 | static __init void init_smack_known_list(void) |
7198e2ee | 3582 | { |
86812bb0 CS |
3583 | /* |
3584 | * Initialize rule list locks | |
3585 | */ | |
3586 | mutex_init(&smack_known_huh.smk_rules_lock); | |
3587 | mutex_init(&smack_known_hat.smk_rules_lock); | |
3588 | mutex_init(&smack_known_floor.smk_rules_lock); | |
3589 | mutex_init(&smack_known_star.smk_rules_lock); | |
3590 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
3591 | mutex_init(&smack_known_web.smk_rules_lock); | |
3592 | /* | |
3593 | * Initialize rule lists | |
3594 | */ | |
3595 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
3596 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
3597 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
3598 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
3599 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
3600 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
3601 | /* | |
3602 | * Create the known labels list | |
3603 | */ | |
7198e2ee EB |
3604 | list_add(&smack_known_huh.list, &smack_known_list); |
3605 | list_add(&smack_known_hat.list, &smack_known_list); | |
3606 | list_add(&smack_known_star.list, &smack_known_list); | |
3607 | list_add(&smack_known_floor.list, &smack_known_list); | |
3608 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3609 | list_add(&smack_known_web.list, &smack_known_list); | |
3610 | } | |
3611 | ||
e114e473 CS |
3612 | /** |
3613 | * smack_init - initialize the smack system | |
3614 | * | |
3615 | * Returns 0 | |
3616 | */ | |
3617 | static __init int smack_init(void) | |
3618 | { | |
d84f4f99 | 3619 | struct cred *cred; |
676dac4b | 3620 | struct task_smack *tsp; |
d84f4f99 | 3621 | |
7898e1f8 CS |
3622 | if (!security_module_enable(&smack_ops)) |
3623 | return 0; | |
3624 | ||
3625 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3626 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3627 | if (tsp == NULL) |
3628 | return -ENOMEM; | |
3629 | ||
e114e473 CS |
3630 | printk(KERN_INFO "Smack: Initializing.\n"); |
3631 | ||
3632 | /* | |
3633 | * Set the security state for the initial task. | |
3634 | */ | |
d84f4f99 | 3635 | cred = (struct cred *) current->cred; |
676dac4b | 3636 | cred->security = tsp; |
e114e473 | 3637 | |
86812bb0 CS |
3638 | /* initialize the smack_known_list */ |
3639 | init_smack_known_list(); | |
e114e473 CS |
3640 | |
3641 | /* | |
3642 | * Register with LSM | |
3643 | */ | |
3644 | if (register_security(&smack_ops)) | |
3645 | panic("smack: Unable to register with kernel.\n"); | |
3646 | ||
3647 | return 0; | |
3648 | } | |
3649 | ||
3650 | /* | |
3651 | * Smack requires early initialization in order to label | |
3652 | * all processes and objects when they are created. | |
3653 | */ | |
3654 | security_initcall(smack_init); |