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> | |
33 | #include <net/netlabel.h> | |
34 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 35 | #include <linux/audit.h> |
1fd7317d | 36 | #include <linux/magic.h> |
2a7dba39 | 37 | #include <linux/dcache.h> |
16014d87 | 38 | #include <linux/personality.h> |
e114e473 CS |
39 | #include "smack.h" |
40 | ||
c69e8d9c DH |
41 | #define task_security(task) (task_cred_xxx((task), security)) |
42 | ||
5c6d1125 JS |
43 | #define TRANS_TRUE "TRUE" |
44 | #define TRANS_TRUE_SIZE 4 | |
45 | ||
e114e473 CS |
46 | /** |
47 | * smk_fetch - Fetch the smack label from a file. | |
48 | * @ip: a pointer to the inode | |
49 | * @dp: a pointer to the dentry | |
50 | * | |
51 | * Returns a pointer to the master list entry for the Smack label | |
52 | * or NULL if there was no label to fetch. | |
53 | */ | |
676dac4b | 54 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
55 | { |
56 | int rc; | |
57 | char in[SMK_LABELLEN]; | |
58 | ||
59 | if (ip->i_op->getxattr == NULL) | |
60 | return NULL; | |
61 | ||
676dac4b | 62 | rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); |
e114e473 CS |
63 | if (rc < 0) |
64 | return NULL; | |
65 | ||
66 | return smk_import(in, rc); | |
67 | } | |
68 | ||
69 | /** | |
70 | * new_inode_smack - allocate an inode security blob | |
71 | * @smack: a pointer to the Smack label to use in the blob | |
72 | * | |
73 | * Returns the new blob or NULL if there's no memory available | |
74 | */ | |
75 | struct inode_smack *new_inode_smack(char *smack) | |
76 | { | |
77 | struct inode_smack *isp; | |
78 | ||
79 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
80 | if (isp == NULL) | |
81 | return NULL; | |
82 | ||
83 | isp->smk_inode = smack; | |
84 | isp->smk_flags = 0; | |
85 | mutex_init(&isp->smk_lock); | |
86 | ||
87 | return isp; | |
88 | } | |
89 | ||
7898e1f8 CS |
90 | /** |
91 | * new_task_smack - allocate a task security blob | |
92 | * @smack: a pointer to the Smack label to use in the blob | |
93 | * | |
94 | * Returns the new blob or NULL if there's no memory available | |
95 | */ | |
96 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
97 | { | |
98 | struct task_smack *tsp; | |
99 | ||
100 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
101 | if (tsp == NULL) | |
102 | return NULL; | |
103 | ||
104 | tsp->smk_task = task; | |
105 | tsp->smk_forked = forked; | |
106 | INIT_LIST_HEAD(&tsp->smk_rules); | |
107 | mutex_init(&tsp->smk_rules_lock); | |
108 | ||
109 | return tsp; | |
110 | } | |
111 | ||
112 | /** | |
113 | * smk_copy_rules - copy a rule set | |
114 | * @nhead - new rules header pointer | |
115 | * @ohead - old rules header pointer | |
116 | * | |
117 | * Returns 0 on success, -ENOMEM on error | |
118 | */ | |
119 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
120 | gfp_t gfp) | |
121 | { | |
122 | struct smack_rule *nrp; | |
123 | struct smack_rule *orp; | |
124 | int rc = 0; | |
125 | ||
126 | INIT_LIST_HEAD(nhead); | |
127 | ||
128 | list_for_each_entry_rcu(orp, ohead, list) { | |
129 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
130 | if (nrp == NULL) { | |
131 | rc = -ENOMEM; | |
132 | break; | |
133 | } | |
134 | *nrp = *orp; | |
135 | list_add_rcu(&nrp->list, nhead); | |
136 | } | |
137 | return rc; | |
138 | } | |
139 | ||
e114e473 CS |
140 | /* |
141 | * LSM hooks. | |
142 | * We he, that is fun! | |
143 | */ | |
144 | ||
145 | /** | |
9e48858f | 146 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 147 | * @ctp: child task pointer |
251a2a95 | 148 | * @mode: ptrace attachment mode |
e114e473 CS |
149 | * |
150 | * Returns 0 if access is OK, an error code otherwise | |
151 | * | |
152 | * Do the capability checks, and require read and write. | |
153 | */ | |
9e48858f | 154 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
155 | { |
156 | int rc; | |
ecfcc53f | 157 | struct smk_audit_info ad; |
7898e1f8 | 158 | char *tsp; |
e114e473 | 159 | |
9e48858f | 160 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
161 | if (rc != 0) |
162 | return rc; | |
163 | ||
676dac4b | 164 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
166 | smk_ad_setfield_u_tsk(&ad, ctp); | |
167 | ||
7898e1f8 | 168 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
169 | return rc; |
170 | } | |
171 | ||
172 | /** | |
173 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
174 | * @ptp: parent task pointer | |
175 | * | |
176 | * Returns 0 if access is OK, an error code otherwise | |
177 | * | |
178 | * Do the capability checks, and require read and write. | |
179 | */ | |
180 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
181 | { | |
182 | int rc; | |
ecfcc53f | 183 | struct smk_audit_info ad; |
7898e1f8 | 184 | char *tsp; |
5cd9c58f DH |
185 | |
186 | rc = cap_ptrace_traceme(ptp); | |
187 | if (rc != 0) | |
188 | return rc; | |
e114e473 | 189 | |
7898e1f8 | 190 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
191 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
192 | smk_ad_setfield_u_tsk(&ad, ptp); | |
193 | ||
7898e1f8 | 194 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
195 | return rc; |
196 | } | |
197 | ||
198 | /** | |
199 | * smack_syslog - Smack approval on syslog | |
200 | * @type: message type | |
201 | * | |
202 | * Require that the task has the floor label | |
203 | * | |
204 | * Returns 0 on success, error code otherwise. | |
205 | */ | |
12b3052c | 206 | static int smack_syslog(int typefrom_file) |
e114e473 | 207 | { |
12b3052c | 208 | int rc = 0; |
676dac4b | 209 | char *sp = smk_of_current(); |
e114e473 | 210 | |
e114e473 CS |
211 | if (capable(CAP_MAC_OVERRIDE)) |
212 | return 0; | |
213 | ||
214 | if (sp != smack_known_floor.smk_known) | |
215 | rc = -EACCES; | |
216 | ||
217 | return rc; | |
218 | } | |
219 | ||
220 | ||
221 | /* | |
222 | * Superblock Hooks. | |
223 | */ | |
224 | ||
225 | /** | |
226 | * smack_sb_alloc_security - allocate a superblock blob | |
227 | * @sb: the superblock getting the blob | |
228 | * | |
229 | * Returns 0 on success or -ENOMEM on error. | |
230 | */ | |
231 | static int smack_sb_alloc_security(struct super_block *sb) | |
232 | { | |
233 | struct superblock_smack *sbsp; | |
234 | ||
235 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
236 | ||
237 | if (sbsp == NULL) | |
238 | return -ENOMEM; | |
239 | ||
240 | sbsp->smk_root = smack_known_floor.smk_known; | |
241 | sbsp->smk_default = smack_known_floor.smk_known; | |
242 | sbsp->smk_floor = smack_known_floor.smk_known; | |
243 | sbsp->smk_hat = smack_known_hat.smk_known; | |
244 | sbsp->smk_initialized = 0; | |
245 | spin_lock_init(&sbsp->smk_sblock); | |
246 | ||
247 | sb->s_security = sbsp; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /** | |
253 | * smack_sb_free_security - free a superblock blob | |
254 | * @sb: the superblock getting the blob | |
255 | * | |
256 | */ | |
257 | static void smack_sb_free_security(struct super_block *sb) | |
258 | { | |
259 | kfree(sb->s_security); | |
260 | sb->s_security = NULL; | |
261 | } | |
262 | ||
263 | /** | |
264 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 265 | * @orig: where to start |
251a2a95 | 266 | * @smackopts: mount options string |
e114e473 CS |
267 | * |
268 | * Returns 0 on success or -ENOMEM on error. | |
269 | * | |
270 | * Copy the Smack specific mount options out of the mount | |
271 | * options list. | |
272 | */ | |
e0007529 | 273 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
274 | { |
275 | char *cp, *commap, *otheropts, *dp; | |
276 | ||
e114e473 CS |
277 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
278 | if (otheropts == NULL) | |
279 | return -ENOMEM; | |
280 | ||
281 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
282 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
283 | dp = smackopts; | |
284 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
285 | dp = smackopts; | |
286 | else if (strstr(cp, SMK_FSHAT) == cp) | |
287 | dp = smackopts; | |
288 | else if (strstr(cp, SMK_FSROOT) == cp) | |
289 | dp = smackopts; | |
290 | else | |
291 | dp = otheropts; | |
292 | ||
293 | commap = strchr(cp, ','); | |
294 | if (commap != NULL) | |
295 | *commap = '\0'; | |
296 | ||
297 | if (*dp != '\0') | |
298 | strcat(dp, ","); | |
299 | strcat(dp, cp); | |
300 | } | |
301 | ||
302 | strcpy(orig, otheropts); | |
303 | free_page((unsigned long)otheropts); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /** | |
309 | * smack_sb_kern_mount - Smack specific mount processing | |
310 | * @sb: the file system superblock | |
12204e24 | 311 | * @flags: the mount flags |
e114e473 CS |
312 | * @data: the smack mount options |
313 | * | |
314 | * Returns 0 on success, an error code on failure | |
315 | */ | |
12204e24 | 316 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
317 | { |
318 | struct dentry *root = sb->s_root; | |
319 | struct inode *inode = root->d_inode; | |
320 | struct superblock_smack *sp = sb->s_security; | |
321 | struct inode_smack *isp; | |
322 | char *op; | |
323 | char *commap; | |
324 | char *nsp; | |
325 | ||
326 | spin_lock(&sp->smk_sblock); | |
327 | if (sp->smk_initialized != 0) { | |
328 | spin_unlock(&sp->smk_sblock); | |
329 | return 0; | |
330 | } | |
331 | sp->smk_initialized = 1; | |
332 | spin_unlock(&sp->smk_sblock); | |
333 | ||
334 | for (op = data; op != NULL; op = commap) { | |
335 | commap = strchr(op, ','); | |
336 | if (commap != NULL) | |
337 | *commap++ = '\0'; | |
338 | ||
339 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
340 | op += strlen(SMK_FSHAT); | |
341 | nsp = smk_import(op, 0); | |
342 | if (nsp != NULL) | |
343 | sp->smk_hat = nsp; | |
344 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
345 | op += strlen(SMK_FSFLOOR); | |
346 | nsp = smk_import(op, 0); | |
347 | if (nsp != NULL) | |
348 | sp->smk_floor = nsp; | |
349 | } else if (strncmp(op, SMK_FSDEFAULT, | |
350 | strlen(SMK_FSDEFAULT)) == 0) { | |
351 | op += strlen(SMK_FSDEFAULT); | |
352 | nsp = smk_import(op, 0); | |
353 | if (nsp != NULL) | |
354 | sp->smk_default = nsp; | |
355 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
356 | op += strlen(SMK_FSROOT); | |
357 | nsp = smk_import(op, 0); | |
358 | if (nsp != NULL) | |
359 | sp->smk_root = nsp; | |
360 | } | |
361 | } | |
362 | ||
363 | /* | |
364 | * Initialize the root inode. | |
365 | */ | |
366 | isp = inode->i_security; | |
367 | if (isp == NULL) | |
368 | inode->i_security = new_inode_smack(sp->smk_root); | |
369 | else | |
370 | isp->smk_inode = sp->smk_root; | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | /** | |
376 | * smack_sb_statfs - Smack check on statfs | |
377 | * @dentry: identifies the file system in question | |
378 | * | |
379 | * Returns 0 if current can read the floor of the filesystem, | |
380 | * and error code otherwise | |
381 | */ | |
382 | static int smack_sb_statfs(struct dentry *dentry) | |
383 | { | |
384 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
385 | int rc; |
386 | struct smk_audit_info ad; | |
387 | ||
a269434d | 388 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 389 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 390 | |
ecfcc53f EB |
391 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
392 | return rc; | |
e114e473 CS |
393 | } |
394 | ||
395 | /** | |
396 | * smack_sb_mount - Smack check for mounting | |
397 | * @dev_name: unused | |
251a2a95 | 398 | * @path: mount point |
e114e473 CS |
399 | * @type: unused |
400 | * @flags: unused | |
401 | * @data: unused | |
402 | * | |
403 | * Returns 0 if current can write the floor of the filesystem | |
404 | * being mounted on, an error code otherwise. | |
405 | */ | |
b5266eb4 | 406 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
407 | char *type, unsigned long flags, void *data) |
408 | { | |
b5266eb4 | 409 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 410 | struct smk_audit_info ad; |
e114e473 | 411 | |
f48b7399 | 412 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f EB |
413 | smk_ad_setfield_u_fs_path(&ad, *path); |
414 | ||
415 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
416 | } |
417 | ||
418 | /** | |
419 | * smack_sb_umount - Smack check for unmounting | |
420 | * @mnt: file system to unmount | |
421 | * @flags: unused | |
422 | * | |
423 | * Returns 0 if current can write the floor of the filesystem | |
424 | * being unmounted, an error code otherwise. | |
425 | */ | |
426 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
427 | { | |
428 | struct superblock_smack *sbp; | |
ecfcc53f | 429 | struct smk_audit_info ad; |
a269434d | 430 | struct path path; |
e114e473 | 431 | |
a269434d EP |
432 | path.dentry = mnt->mnt_root; |
433 | path.mnt = mnt; | |
e114e473 | 434 | |
f48b7399 | 435 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 436 | smk_ad_setfield_u_fs_path(&ad, path); |
e114e473 | 437 | |
ecfcc53f EB |
438 | sbp = mnt->mnt_sb->s_security; |
439 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
440 | } |
441 | ||
676dac4b CS |
442 | /* |
443 | * BPRM hooks | |
444 | */ | |
445 | ||
ce8a4321 CS |
446 | /** |
447 | * smack_bprm_set_creds - set creds for exec | |
448 | * @bprm: the exec information | |
449 | * | |
450 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
451 | */ | |
676dac4b CS |
452 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
453 | { | |
84088ba2 JS |
454 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
455 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 456 | struct inode_smack *isp; |
676dac4b CS |
457 | int rc; |
458 | ||
459 | rc = cap_bprm_set_creds(bprm); | |
460 | if (rc != 0) | |
461 | return rc; | |
462 | ||
463 | if (bprm->cred_prepared) | |
464 | return 0; | |
465 | ||
84088ba2 JS |
466 | isp = inode->i_security; |
467 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
468 | return 0; |
469 | ||
84088ba2 JS |
470 | if (bprm->unsafe) |
471 | return -EPERM; | |
676dac4b | 472 | |
84088ba2 JS |
473 | bsp->smk_task = isp->smk_task; |
474 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 475 | |
84088ba2 JS |
476 | return 0; |
477 | } | |
676dac4b | 478 | |
84088ba2 JS |
479 | /** |
480 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
481 | * from bprm. | |
482 | * | |
483 | * @bprm: binprm for exec | |
484 | */ | |
485 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
486 | { | |
487 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 488 | |
84088ba2 JS |
489 | if (bsp->smk_task != bsp->smk_forked) |
490 | current->pdeath_signal = 0; | |
491 | } | |
492 | ||
493 | /** | |
494 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
495 | * @bprm: binprm for exec | |
496 | * | |
497 | * Returns 0 on success. | |
498 | */ | |
499 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
500 | { | |
501 | struct task_smack *tsp = current_security(); | |
502 | int ret = cap_bprm_secureexec(bprm); | |
503 | ||
504 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
505 | ret = 1; | |
506 | ||
507 | return ret; | |
676dac4b CS |
508 | } |
509 | ||
e114e473 CS |
510 | /* |
511 | * Inode hooks | |
512 | */ | |
513 | ||
514 | /** | |
515 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 516 | * @inode: the inode in need of a blob |
e114e473 CS |
517 | * |
518 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
519 | */ | |
520 | static int smack_inode_alloc_security(struct inode *inode) | |
521 | { | |
676dac4b | 522 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
523 | if (inode->i_security == NULL) |
524 | return -ENOMEM; | |
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 530 | * @inode: the inode with a blob |
e114e473 CS |
531 | * |
532 | * Clears the blob pointer in inode | |
533 | */ | |
534 | static void smack_inode_free_security(struct inode *inode) | |
535 | { | |
536 | kfree(inode->i_security); | |
537 | inode->i_security = NULL; | |
538 | } | |
539 | ||
540 | /** | |
541 | * smack_inode_init_security - copy out the smack from an inode | |
542 | * @inode: the inode | |
543 | * @dir: unused | |
2a7dba39 | 544 | * @qstr: unused |
e114e473 CS |
545 | * @name: where to put the attribute name |
546 | * @value: where to put the attribute value | |
547 | * @len: where to put the length of the attribute | |
548 | * | |
549 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
550 | */ | |
551 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
2a7dba39 EP |
552 | const struct qstr *qstr, char **name, |
553 | void **value, size_t *len) | |
e114e473 | 554 | { |
272cd7a8 CS |
555 | struct smack_known *skp; |
556 | char *csp = smk_of_current(); | |
e114e473 | 557 | char *isp = smk_of_inode(inode); |
5c6d1125 | 558 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 559 | int may; |
e114e473 CS |
560 | |
561 | if (name) { | |
562 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
563 | if (*name == NULL) | |
564 | return -ENOMEM; | |
565 | } | |
566 | ||
567 | if (value) { | |
272cd7a8 | 568 | skp = smk_find_entry(csp); |
7898e1f8 | 569 | rcu_read_lock(); |
272cd7a8 | 570 | may = smk_access_entry(csp, dsp, &skp->smk_rules); |
7898e1f8 | 571 | rcu_read_unlock(); |
5c6d1125 JS |
572 | |
573 | /* | |
574 | * If the access rule allows transmutation and | |
575 | * the directory requests transmutation then | |
576 | * by all means transmute. | |
577 | */ | |
7898e1f8 CS |
578 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
579 | smk_inode_transmutable(dir)) | |
5c6d1125 JS |
580 | isp = dsp; |
581 | ||
e114e473 CS |
582 | *value = kstrdup(isp, GFP_KERNEL); |
583 | if (*value == NULL) | |
584 | return -ENOMEM; | |
585 | } | |
586 | ||
587 | if (len) | |
588 | *len = strlen(isp) + 1; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | /** | |
594 | * smack_inode_link - Smack check on link | |
595 | * @old_dentry: the existing object | |
596 | * @dir: unused | |
597 | * @new_dentry: the new object | |
598 | * | |
599 | * Returns 0 if access is permitted, an error code otherwise | |
600 | */ | |
601 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
602 | struct dentry *new_dentry) | |
603 | { | |
e114e473 | 604 | char *isp; |
ecfcc53f EB |
605 | struct smk_audit_info ad; |
606 | int rc; | |
607 | ||
a269434d | 608 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 609 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
610 | |
611 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 612 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
613 | |
614 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
615 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
616 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
617 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
618 | } |
619 | ||
620 | return rc; | |
621 | } | |
622 | ||
623 | /** | |
624 | * smack_inode_unlink - Smack check on inode deletion | |
625 | * @dir: containing directory object | |
626 | * @dentry: file to unlink | |
627 | * | |
628 | * Returns 0 if current can write the containing directory | |
629 | * and the object, error code otherwise | |
630 | */ | |
631 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
632 | { | |
633 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 634 | struct smk_audit_info ad; |
e114e473 CS |
635 | int rc; |
636 | ||
a269434d | 637 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
638 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
639 | ||
e114e473 CS |
640 | /* |
641 | * You need write access to the thing you're unlinking | |
642 | */ | |
ecfcc53f EB |
643 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
644 | if (rc == 0) { | |
e114e473 CS |
645 | /* |
646 | * You also need write access to the containing directory | |
647 | */ | |
ecfcc53f EB |
648 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
649 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
650 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
651 | } | |
e114e473 CS |
652 | return rc; |
653 | } | |
654 | ||
655 | /** | |
656 | * smack_inode_rmdir - Smack check on directory deletion | |
657 | * @dir: containing directory object | |
658 | * @dentry: directory to unlink | |
659 | * | |
660 | * Returns 0 if current can write the containing directory | |
661 | * and the directory, error code otherwise | |
662 | */ | |
663 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
664 | { | |
ecfcc53f | 665 | struct smk_audit_info ad; |
e114e473 CS |
666 | int rc; |
667 | ||
a269434d | 668 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
669 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
670 | ||
e114e473 CS |
671 | /* |
672 | * You need write access to the thing you're removing | |
673 | */ | |
ecfcc53f EB |
674 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
675 | if (rc == 0) { | |
e114e473 CS |
676 | /* |
677 | * You also need write access to the containing directory | |
678 | */ | |
ecfcc53f EB |
679 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
680 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
681 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
682 | } | |
e114e473 CS |
683 | |
684 | return rc; | |
685 | } | |
686 | ||
687 | /** | |
688 | * smack_inode_rename - Smack check on rename | |
689 | * @old_inode: the old directory | |
690 | * @old_dentry: unused | |
691 | * @new_inode: the new directory | |
692 | * @new_dentry: unused | |
693 | * | |
694 | * Read and write access is required on both the old and | |
695 | * new directories. | |
696 | * | |
697 | * Returns 0 if access is permitted, an error code otherwise | |
698 | */ | |
699 | static int smack_inode_rename(struct inode *old_inode, | |
700 | struct dentry *old_dentry, | |
701 | struct inode *new_inode, | |
702 | struct dentry *new_dentry) | |
703 | { | |
704 | int rc; | |
705 | char *isp; | |
ecfcc53f EB |
706 | struct smk_audit_info ad; |
707 | ||
a269434d | 708 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 709 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
710 | |
711 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 712 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
713 | |
714 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
715 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
716 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
717 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 718 | } |
e114e473 CS |
719 | return rc; |
720 | } | |
721 | ||
722 | /** | |
723 | * smack_inode_permission - Smack version of permission() | |
724 | * @inode: the inode in question | |
725 | * @mask: the access requested | |
e114e473 CS |
726 | * |
727 | * This is the important Smack hook. | |
728 | * | |
729 | * Returns 0 if access is permitted, -EACCES otherwise | |
730 | */ | |
e74f71eb | 731 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 732 | { |
ecfcc53f | 733 | struct smk_audit_info ad; |
e74f71eb | 734 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
735 | |
736 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
737 | /* |
738 | * No permission to check. Existence test. Yup, it's there. | |
739 | */ | |
740 | if (mask == 0) | |
741 | return 0; | |
8c9e80ed AK |
742 | |
743 | /* May be droppable after audit */ | |
e74f71eb | 744 | if (no_block) |
8c9e80ed | 745 | return -ECHILD; |
f48b7399 | 746 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
747 | smk_ad_setfield_u_fs_inode(&ad, inode); |
748 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
749 | } |
750 | ||
751 | /** | |
752 | * smack_inode_setattr - Smack check for setting attributes | |
753 | * @dentry: the object | |
754 | * @iattr: for the force flag | |
755 | * | |
756 | * Returns 0 if access is permitted, an error code otherwise | |
757 | */ | |
758 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
759 | { | |
ecfcc53f | 760 | struct smk_audit_info ad; |
e114e473 CS |
761 | /* |
762 | * Need to allow for clearing the setuid bit. | |
763 | */ | |
764 | if (iattr->ia_valid & ATTR_FORCE) | |
765 | return 0; | |
a269434d | 766 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 767 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 768 | |
ecfcc53f | 769 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
770 | } |
771 | ||
772 | /** | |
773 | * smack_inode_getattr - Smack check for getting attributes | |
774 | * @mnt: unused | |
775 | * @dentry: the object | |
776 | * | |
777 | * Returns 0 if access is permitted, an error code otherwise | |
778 | */ | |
779 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
780 | { | |
ecfcc53f | 781 | struct smk_audit_info ad; |
a269434d | 782 | struct path path; |
ecfcc53f | 783 | |
a269434d EP |
784 | path.dentry = dentry; |
785 | path.mnt = mnt; | |
ecfcc53f | 786 | |
f48b7399 | 787 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 788 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 789 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
790 | } |
791 | ||
792 | /** | |
793 | * smack_inode_setxattr - Smack check for setting xattrs | |
794 | * @dentry: the object | |
795 | * @name: name of the attribute | |
796 | * @value: unused | |
797 | * @size: unused | |
798 | * @flags: unused | |
799 | * | |
800 | * This protects the Smack attribute explicitly. | |
801 | * | |
802 | * Returns 0 if access is permitted, an error code otherwise | |
803 | */ | |
8f0cfa52 DH |
804 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
805 | const void *value, size_t size, int flags) | |
e114e473 | 806 | { |
ecfcc53f | 807 | struct smk_audit_info ad; |
bcdca225 | 808 | int rc = 0; |
e114e473 | 809 | |
bcdca225 CS |
810 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
811 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 812 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
813 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
814 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
815 | if (!capable(CAP_MAC_ADMIN)) |
816 | rc = -EPERM; | |
defc433b EB |
817 | /* |
818 | * check label validity here so import wont fail on | |
819 | * post_setxattr | |
820 | */ | |
821 | if (size == 0 || size >= SMK_LABELLEN || | |
822 | smk_import(value, size) == NULL) | |
4303154e | 823 | rc = -EINVAL; |
5c6d1125 JS |
824 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
825 | if (!capable(CAP_MAC_ADMIN)) | |
826 | rc = -EPERM; | |
827 | if (size != TRANS_TRUE_SIZE || | |
828 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
829 | rc = -EINVAL; | |
bcdca225 CS |
830 | } else |
831 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
832 | ||
a269434d | 833 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
834 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
835 | ||
bcdca225 | 836 | if (rc == 0) |
ecfcc53f | 837 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
838 | |
839 | return rc; | |
e114e473 CS |
840 | } |
841 | ||
842 | /** | |
843 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
844 | * @dentry: object | |
845 | * @name: attribute name | |
846 | * @value: attribute value | |
847 | * @size: attribute size | |
848 | * @flags: unused | |
849 | * | |
850 | * Set the pointer in the inode blob to the entry found | |
851 | * in the master label list. | |
852 | */ | |
8f0cfa52 DH |
853 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
854 | const void *value, size_t size, int flags) | |
e114e473 | 855 | { |
e114e473 | 856 | char *nsp; |
5c6d1125 | 857 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
858 | |
859 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 860 | nsp = smk_import(value, size); |
676dac4b CS |
861 | if (nsp != NULL) |
862 | isp->smk_inode = nsp; | |
863 | else | |
864 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
865 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
866 | nsp = smk_import(value, size); | |
676dac4b CS |
867 | if (nsp != NULL) |
868 | isp->smk_task = nsp; | |
869 | else | |
870 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
871 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
872 | nsp = smk_import(value, size); | |
873 | if (nsp != NULL) | |
874 | isp->smk_mmap = nsp; | |
875 | else | |
876 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
877 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
878 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
879 | |
880 | return; | |
881 | } | |
882 | ||
ce8a4321 | 883 | /** |
e114e473 CS |
884 | * smack_inode_getxattr - Smack check on getxattr |
885 | * @dentry: the object | |
886 | * @name: unused | |
887 | * | |
888 | * Returns 0 if access is permitted, an error code otherwise | |
889 | */ | |
8f0cfa52 | 890 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 891 | { |
ecfcc53f EB |
892 | struct smk_audit_info ad; |
893 | ||
a269434d | 894 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
895 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
896 | ||
897 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
898 | } |
899 | ||
ce8a4321 | 900 | /** |
e114e473 CS |
901 | * smack_inode_removexattr - Smack check on removexattr |
902 | * @dentry: the object | |
903 | * @name: name of the attribute | |
904 | * | |
905 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
906 | * | |
907 | * Returns 0 if access is permitted, an error code otherwise | |
908 | */ | |
8f0cfa52 | 909 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 910 | { |
676dac4b | 911 | struct inode_smack *isp; |
ecfcc53f | 912 | struct smk_audit_info ad; |
bcdca225 | 913 | int rc = 0; |
e114e473 | 914 | |
bcdca225 CS |
915 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
916 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 917 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 918 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
919 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
920 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
921 | if (!capable(CAP_MAC_ADMIN)) |
922 | rc = -EPERM; | |
923 | } else | |
924 | rc = cap_inode_removexattr(dentry, name); | |
925 | ||
a269434d | 926 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 927 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 928 | if (rc == 0) |
ecfcc53f | 929 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 930 | |
676dac4b CS |
931 | if (rc == 0) { |
932 | isp = dentry->d_inode->i_security; | |
933 | isp->smk_task = NULL; | |
7898e1f8 | 934 | isp->smk_mmap = NULL; |
676dac4b CS |
935 | } |
936 | ||
bcdca225 | 937 | return rc; |
e114e473 CS |
938 | } |
939 | ||
940 | /** | |
941 | * smack_inode_getsecurity - get smack xattrs | |
942 | * @inode: the object | |
943 | * @name: attribute name | |
944 | * @buffer: where to put the result | |
251a2a95 | 945 | * @alloc: unused |
e114e473 CS |
946 | * |
947 | * Returns the size of the attribute or an error code | |
948 | */ | |
949 | static int smack_inode_getsecurity(const struct inode *inode, | |
950 | const char *name, void **buffer, | |
951 | bool alloc) | |
952 | { | |
953 | struct socket_smack *ssp; | |
954 | struct socket *sock; | |
955 | struct super_block *sbp; | |
956 | struct inode *ip = (struct inode *)inode; | |
957 | char *isp; | |
958 | int ilen; | |
959 | int rc = 0; | |
960 | ||
961 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
962 | isp = smk_of_inode(inode); | |
963 | ilen = strlen(isp) + 1; | |
964 | *buffer = isp; | |
965 | return ilen; | |
966 | } | |
967 | ||
968 | /* | |
969 | * The rest of the Smack xattrs are only on sockets. | |
970 | */ | |
971 | sbp = ip->i_sb; | |
972 | if (sbp->s_magic != SOCKFS_MAGIC) | |
973 | return -EOPNOTSUPP; | |
974 | ||
975 | sock = SOCKET_I(ip); | |
2e1d146a | 976 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
977 | return -EOPNOTSUPP; |
978 | ||
979 | ssp = sock->sk->sk_security; | |
980 | ||
981 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
982 | isp = ssp->smk_in; | |
983 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
984 | isp = ssp->smk_out; | |
985 | else | |
986 | return -EOPNOTSUPP; | |
987 | ||
988 | ilen = strlen(isp) + 1; | |
989 | if (rc == 0) { | |
990 | *buffer = isp; | |
991 | rc = ilen; | |
992 | } | |
993 | ||
994 | return rc; | |
995 | } | |
996 | ||
997 | ||
998 | /** | |
999 | * smack_inode_listsecurity - list the Smack attributes | |
1000 | * @inode: the object | |
1001 | * @buffer: where they go | |
1002 | * @buffer_size: size of buffer | |
1003 | * | |
1004 | * Returns 0 on success, -EINVAL otherwise | |
1005 | */ | |
1006 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1007 | size_t buffer_size) | |
1008 | { | |
1009 | int len = strlen(XATTR_NAME_SMACK); | |
1010 | ||
1011 | if (buffer != NULL && len <= buffer_size) { | |
1012 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1013 | return len; | |
1014 | } | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
d20bdda6 AD |
1018 | /** |
1019 | * smack_inode_getsecid - Extract inode's security id | |
1020 | * @inode: inode to extract the info from | |
1021 | * @secid: where result will be saved | |
1022 | */ | |
1023 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1024 | { | |
1025 | struct inode_smack *isp = inode->i_security; | |
1026 | ||
1027 | *secid = smack_to_secid(isp->smk_inode); | |
1028 | } | |
1029 | ||
e114e473 CS |
1030 | /* |
1031 | * File Hooks | |
1032 | */ | |
1033 | ||
1034 | /** | |
1035 | * smack_file_permission - Smack check on file operations | |
1036 | * @file: unused | |
1037 | * @mask: unused | |
1038 | * | |
1039 | * Returns 0 | |
1040 | * | |
1041 | * Should access checks be done on each read or write? | |
1042 | * UNICOS and SELinux say yes. | |
1043 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1044 | * | |
1045 | * I'll say no for now. Smack does not do the frequent | |
1046 | * label changing that SELinux does. | |
1047 | */ | |
1048 | static int smack_file_permission(struct file *file, int mask) | |
1049 | { | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | /** | |
1054 | * smack_file_alloc_security - assign a file security blob | |
1055 | * @file: the object | |
1056 | * | |
1057 | * The security blob for a file is a pointer to the master | |
1058 | * label list, so no allocation is done. | |
1059 | * | |
1060 | * Returns 0 | |
1061 | */ | |
1062 | static int smack_file_alloc_security(struct file *file) | |
1063 | { | |
676dac4b | 1064 | file->f_security = smk_of_current(); |
e114e473 CS |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * smack_file_free_security - clear a file security blob | |
1070 | * @file: the object | |
1071 | * | |
1072 | * The security blob for a file is a pointer to the master | |
1073 | * label list, so no memory is freed. | |
1074 | */ | |
1075 | static void smack_file_free_security(struct file *file) | |
1076 | { | |
1077 | file->f_security = NULL; | |
1078 | } | |
1079 | ||
1080 | /** | |
1081 | * smack_file_ioctl - Smack check on ioctls | |
1082 | * @file: the object | |
1083 | * @cmd: what to do | |
1084 | * @arg: unused | |
1085 | * | |
1086 | * Relies heavily on the correct use of the ioctl command conventions. | |
1087 | * | |
1088 | * Returns 0 if allowed, error code otherwise | |
1089 | */ | |
1090 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1091 | unsigned long arg) | |
1092 | { | |
1093 | int rc = 0; | |
ecfcc53f EB |
1094 | struct smk_audit_info ad; |
1095 | ||
f48b7399 | 1096 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1097 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1098 | |
1099 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1100 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1101 | |
1102 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1103 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1104 | |
1105 | return rc; | |
1106 | } | |
1107 | ||
1108 | /** | |
1109 | * smack_file_lock - Smack check on file locking | |
1110 | * @file: the object | |
251a2a95 | 1111 | * @cmd: unused |
e114e473 CS |
1112 | * |
1113 | * Returns 0 if current has write access, error code otherwise | |
1114 | */ | |
1115 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1116 | { | |
ecfcc53f EB |
1117 | struct smk_audit_info ad; |
1118 | ||
92f42509 EP |
1119 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1120 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1121 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * smack_file_fcntl - Smack check on fcntl | |
1126 | * @file: the object | |
1127 | * @cmd: what action to check | |
1128 | * @arg: unused | |
1129 | * | |
531f1d45 CS |
1130 | * Generally these operations are harmless. |
1131 | * File locking operations present an obvious mechanism | |
1132 | * for passing information, so they require write access. | |
1133 | * | |
e114e473 CS |
1134 | * Returns 0 if current has access, error code otherwise |
1135 | */ | |
1136 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1137 | unsigned long arg) | |
1138 | { | |
ecfcc53f | 1139 | struct smk_audit_info ad; |
531f1d45 | 1140 | int rc = 0; |
e114e473 | 1141 | |
ecfcc53f | 1142 | |
e114e473 | 1143 | switch (cmd) { |
e114e473 | 1144 | case F_GETLK: |
e114e473 CS |
1145 | case F_SETLK: |
1146 | case F_SETLKW: | |
1147 | case F_SETOWN: | |
1148 | case F_SETSIG: | |
531f1d45 CS |
1149 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1150 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1151 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1152 | break; |
1153 | default: | |
531f1d45 | 1154 | break; |
e114e473 CS |
1155 | } |
1156 | ||
1157 | return rc; | |
1158 | } | |
1159 | ||
7898e1f8 CS |
1160 | /** |
1161 | * smack_file_mmap : | |
1162 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1163 | * if mapping anonymous memory. | |
1164 | * @file contains the file structure for file to map (may be NULL). | |
1165 | * @reqprot contains the protection requested by the application. | |
1166 | * @prot contains the protection that will be applied by the kernel. | |
1167 | * @flags contains the operational flags. | |
1168 | * Return 0 if permission is granted. | |
1169 | */ | |
1170 | static int smack_file_mmap(struct file *file, | |
1171 | unsigned long reqprot, unsigned long prot, | |
1172 | unsigned long flags, unsigned long addr, | |
1173 | unsigned long addr_only) | |
1174 | { | |
272cd7a8 | 1175 | struct smack_known *skp; |
7898e1f8 CS |
1176 | struct smack_rule *srp; |
1177 | struct task_smack *tsp; | |
1178 | char *sp; | |
1179 | char *msmack; | |
0e0a070d | 1180 | char *osmack; |
7898e1f8 CS |
1181 | struct inode_smack *isp; |
1182 | struct dentry *dp; | |
0e0a070d CS |
1183 | int may; |
1184 | int mmay; | |
1185 | int tmay; | |
7898e1f8 CS |
1186 | int rc; |
1187 | ||
1188 | /* do DAC check on address space usage */ | |
1189 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1190 | if (rc || addr_only) | |
1191 | return rc; | |
1192 | ||
1193 | if (file == NULL || file->f_dentry == NULL) | |
1194 | return 0; | |
1195 | ||
1196 | dp = file->f_dentry; | |
1197 | ||
1198 | if (dp->d_inode == NULL) | |
1199 | return 0; | |
1200 | ||
1201 | isp = dp->d_inode->i_security; | |
1202 | if (isp->smk_mmap == NULL) | |
1203 | return 0; | |
1204 | msmack = isp->smk_mmap; | |
1205 | ||
1206 | tsp = current_security(); | |
1207 | sp = smk_of_current(); | |
272cd7a8 | 1208 | skp = smk_find_entry(sp); |
7898e1f8 CS |
1209 | rc = 0; |
1210 | ||
1211 | rcu_read_lock(); | |
1212 | /* | |
1213 | * For each Smack rule associated with the subject | |
1214 | * label verify that the SMACK64MMAP also has access | |
1215 | * to that rule's object label. | |
7898e1f8 | 1216 | */ |
272cd7a8 | 1217 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1218 | osmack = srp->smk_object; |
7898e1f8 CS |
1219 | /* |
1220 | * Matching labels always allows access. | |
1221 | */ | |
0e0a070d | 1222 | if (msmack == osmack) |
7898e1f8 | 1223 | continue; |
0e0a070d CS |
1224 | /* |
1225 | * If there is a matching local rule take | |
1226 | * that into account as well. | |
1227 | */ | |
1228 | may = smk_access_entry(srp->smk_subject, osmack, | |
1229 | &tsp->smk_rules); | |
1230 | if (may == -ENOENT) | |
1231 | may = srp->smk_access; | |
1232 | else | |
1233 | may &= srp->smk_access; | |
1234 | /* | |
1235 | * If may is zero the SMACK64MMAP subject can't | |
1236 | * possibly have less access. | |
1237 | */ | |
1238 | if (may == 0) | |
1239 | continue; | |
1240 | ||
1241 | /* | |
1242 | * Fetch the global list entry. | |
1243 | * If there isn't one a SMACK64MMAP subject | |
1244 | * can't have as much access as current. | |
1245 | */ | |
272cd7a8 CS |
1246 | skp = smk_find_entry(msmack); |
1247 | mmay = smk_access_entry(msmack, osmack, &skp->smk_rules); | |
0e0a070d CS |
1248 | if (mmay == -ENOENT) { |
1249 | rc = -EACCES; | |
1250 | break; | |
1251 | } | |
1252 | /* | |
1253 | * If there is a local entry it modifies the | |
1254 | * potential access, too. | |
1255 | */ | |
1256 | tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules); | |
1257 | if (tmay != -ENOENT) | |
1258 | mmay &= tmay; | |
7898e1f8 | 1259 | |
0e0a070d CS |
1260 | /* |
1261 | * If there is any access available to current that is | |
1262 | * not available to a SMACK64MMAP subject | |
1263 | * deny access. | |
1264 | */ | |
75a25637 | 1265 | if ((may | mmay) != mmay) { |
0e0a070d | 1266 | rc = -EACCES; |
7898e1f8 | 1267 | break; |
0e0a070d | 1268 | } |
7898e1f8 CS |
1269 | } |
1270 | ||
1271 | rcu_read_unlock(); | |
1272 | ||
1273 | return rc; | |
1274 | } | |
1275 | ||
e114e473 CS |
1276 | /** |
1277 | * smack_file_set_fowner - set the file security blob value | |
1278 | * @file: object in question | |
1279 | * | |
1280 | * Returns 0 | |
1281 | * Further research may be required on this one. | |
1282 | */ | |
1283 | static int smack_file_set_fowner(struct file *file) | |
1284 | { | |
676dac4b | 1285 | file->f_security = smk_of_current(); |
e114e473 CS |
1286 | return 0; |
1287 | } | |
1288 | ||
1289 | /** | |
1290 | * smack_file_send_sigiotask - Smack on sigio | |
1291 | * @tsk: The target task | |
1292 | * @fown: the object the signal come from | |
1293 | * @signum: unused | |
1294 | * | |
1295 | * Allow a privileged task to get signals even if it shouldn't | |
1296 | * | |
1297 | * Returns 0 if a subject with the object's smack could | |
1298 | * write to the task, an error code otherwise. | |
1299 | */ | |
1300 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1301 | struct fown_struct *fown, int signum) | |
1302 | { | |
1303 | struct file *file; | |
1304 | int rc; | |
676dac4b | 1305 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1306 | struct smk_audit_info ad; |
e114e473 CS |
1307 | |
1308 | /* | |
1309 | * struct fown_struct is never outside the context of a struct file | |
1310 | */ | |
1311 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1312 | |
ecfcc53f EB |
1313 | /* we don't log here as rc can be overriden */ |
1314 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1315 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1316 | rc = 0; |
1317 | ||
1318 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1319 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1320 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1321 | return rc; |
1322 | } | |
1323 | ||
1324 | /** | |
1325 | * smack_file_receive - Smack file receive check | |
1326 | * @file: the object | |
1327 | * | |
1328 | * Returns 0 if current has access, error code otherwise | |
1329 | */ | |
1330 | static int smack_file_receive(struct file *file) | |
1331 | { | |
1332 | int may = 0; | |
ecfcc53f | 1333 | struct smk_audit_info ad; |
e114e473 | 1334 | |
ecfcc53f EB |
1335 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1336 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1337 | /* |
1338 | * This code relies on bitmasks. | |
1339 | */ | |
1340 | if (file->f_mode & FMODE_READ) | |
1341 | may = MAY_READ; | |
1342 | if (file->f_mode & FMODE_WRITE) | |
1343 | may |= MAY_WRITE; | |
1344 | ||
ecfcc53f | 1345 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1346 | } |
1347 | ||
531f1d45 CS |
1348 | /** |
1349 | * smack_dentry_open - Smack dentry open processing | |
1350 | * @file: the object | |
1351 | * @cred: unused | |
1352 | * | |
1353 | * Set the security blob in the file structure. | |
1354 | * | |
1355 | * Returns 0 | |
1356 | */ | |
1357 | static int smack_dentry_open(struct file *file, const struct cred *cred) | |
1358 | { | |
1359 | struct inode_smack *isp = file->f_path.dentry->d_inode->i_security; | |
1360 | ||
1361 | file->f_security = isp->smk_inode; | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
e114e473 CS |
1366 | /* |
1367 | * Task hooks | |
1368 | */ | |
1369 | ||
ee18d64c DH |
1370 | /** |
1371 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1372 | * @new: the new credentials | |
1373 | * @gfp: the atomicity of any memory allocations | |
1374 | * | |
1375 | * Prepare a blank set of credentials for modification. This must allocate all | |
1376 | * the memory the LSM module might require such that cred_transfer() can | |
1377 | * complete without error. | |
1378 | */ | |
1379 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1380 | { | |
7898e1f8 CS |
1381 | struct task_smack *tsp; |
1382 | ||
1383 | tsp = new_task_smack(NULL, NULL, gfp); | |
1384 | if (tsp == NULL) | |
676dac4b | 1385 | return -ENOMEM; |
7898e1f8 CS |
1386 | |
1387 | cred->security = tsp; | |
1388 | ||
ee18d64c DH |
1389 | return 0; |
1390 | } | |
1391 | ||
1392 | ||
e114e473 | 1393 | /** |
f1752eec DH |
1394 | * smack_cred_free - "free" task-level security credentials |
1395 | * @cred: the credentials in question | |
e114e473 | 1396 | * |
e114e473 | 1397 | */ |
f1752eec | 1398 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1399 | { |
7898e1f8 CS |
1400 | struct task_smack *tsp = cred->security; |
1401 | struct smack_rule *rp; | |
1402 | struct list_head *l; | |
1403 | struct list_head *n; | |
1404 | ||
1405 | if (tsp == NULL) | |
1406 | return; | |
1407 | cred->security = NULL; | |
1408 | ||
1409 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1410 | rp = list_entry(l, struct smack_rule, list); | |
1411 | list_del(&rp->list); | |
1412 | kfree(rp); | |
1413 | } | |
1414 | kfree(tsp); | |
e114e473 CS |
1415 | } |
1416 | ||
d84f4f99 DH |
1417 | /** |
1418 | * smack_cred_prepare - prepare new set of credentials for modification | |
1419 | * @new: the new credentials | |
1420 | * @old: the original credentials | |
1421 | * @gfp: the atomicity of any memory allocations | |
1422 | * | |
1423 | * Prepare a new set of credentials for modification. | |
1424 | */ | |
1425 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1426 | gfp_t gfp) | |
1427 | { | |
676dac4b CS |
1428 | struct task_smack *old_tsp = old->security; |
1429 | struct task_smack *new_tsp; | |
7898e1f8 | 1430 | int rc; |
676dac4b | 1431 | |
7898e1f8 | 1432 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1433 | if (new_tsp == NULL) |
1434 | return -ENOMEM; | |
1435 | ||
7898e1f8 CS |
1436 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1437 | if (rc != 0) | |
1438 | return rc; | |
1439 | ||
676dac4b | 1440 | new->security = new_tsp; |
d84f4f99 DH |
1441 | return 0; |
1442 | } | |
1443 | ||
ee18d64c DH |
1444 | /** |
1445 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1446 | * @new: the new credentials | |
1447 | * @old: the original credentials | |
1448 | * | |
1449 | * Fill in a set of blank credentials from another set of credentials. | |
1450 | */ | |
1451 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1452 | { | |
676dac4b CS |
1453 | struct task_smack *old_tsp = old->security; |
1454 | struct task_smack *new_tsp = new->security; | |
1455 | ||
1456 | new_tsp->smk_task = old_tsp->smk_task; | |
1457 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1458 | mutex_init(&new_tsp->smk_rules_lock); |
1459 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1460 | ||
1461 | ||
1462 | /* cbs copy rule list */ | |
ee18d64c DH |
1463 | } |
1464 | ||
3a3b7ce9 DH |
1465 | /** |
1466 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1467 | * @new: points to the set of credentials to be modified. |
1468 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1469 | * |
1470 | * Set the security data for a kernel service. | |
1471 | */ | |
1472 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1473 | { | |
676dac4b | 1474 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1475 | char *smack = smack_from_secid(secid); |
1476 | ||
1477 | if (smack == NULL) | |
1478 | return -EINVAL; | |
1479 | ||
676dac4b | 1480 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1481 | return 0; |
1482 | } | |
1483 | ||
1484 | /** | |
1485 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1486 | * @new: points to the set of credentials to be modified |
1487 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1488 | * |
1489 | * Set the file creation context in a set of credentials to the same | |
1490 | * as the objective context of the specified inode | |
1491 | */ | |
1492 | static int smack_kernel_create_files_as(struct cred *new, | |
1493 | struct inode *inode) | |
1494 | { | |
1495 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1496 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1497 | |
676dac4b CS |
1498 | tsp->smk_forked = isp->smk_inode; |
1499 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1500 | return 0; |
1501 | } | |
1502 | ||
ecfcc53f EB |
1503 | /** |
1504 | * smk_curacc_on_task - helper to log task related access | |
1505 | * @p: the task object | |
531f1d45 CS |
1506 | * @access: the access requested |
1507 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1508 | * |
1509 | * Return 0 if access is permitted | |
1510 | */ | |
531f1d45 CS |
1511 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1512 | const char *caller) | |
ecfcc53f EB |
1513 | { |
1514 | struct smk_audit_info ad; | |
1515 | ||
531f1d45 | 1516 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1517 | smk_ad_setfield_u_tsk(&ad, p); |
676dac4b | 1518 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1519 | } |
1520 | ||
e114e473 CS |
1521 | /** |
1522 | * smack_task_setpgid - Smack check on setting pgid | |
1523 | * @p: the task object | |
1524 | * @pgid: unused | |
1525 | * | |
1526 | * Return 0 if write access is permitted | |
1527 | */ | |
1528 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1529 | { | |
531f1d45 | 1530 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1531 | } |
1532 | ||
1533 | /** | |
1534 | * smack_task_getpgid - Smack access check for getpgid | |
1535 | * @p: the object task | |
1536 | * | |
1537 | * Returns 0 if current can read the object task, error code otherwise | |
1538 | */ | |
1539 | static int smack_task_getpgid(struct task_struct *p) | |
1540 | { | |
531f1d45 | 1541 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1542 | } |
1543 | ||
1544 | /** | |
1545 | * smack_task_getsid - Smack access check for getsid | |
1546 | * @p: the object task | |
1547 | * | |
1548 | * Returns 0 if current can read the object task, error code otherwise | |
1549 | */ | |
1550 | static int smack_task_getsid(struct task_struct *p) | |
1551 | { | |
531f1d45 | 1552 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1553 | } |
1554 | ||
1555 | /** | |
1556 | * smack_task_getsecid - get the secid of the task | |
1557 | * @p: the object task | |
1558 | * @secid: where to put the result | |
1559 | * | |
1560 | * Sets the secid to contain a u32 version of the smack label. | |
1561 | */ | |
1562 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1563 | { | |
676dac4b | 1564 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1565 | } |
1566 | ||
1567 | /** | |
1568 | * smack_task_setnice - Smack check on setting nice | |
1569 | * @p: the task object | |
1570 | * @nice: unused | |
1571 | * | |
1572 | * Return 0 if write access is permitted | |
1573 | */ | |
1574 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1575 | { | |
bcdca225 CS |
1576 | int rc; |
1577 | ||
1578 | rc = cap_task_setnice(p, nice); | |
1579 | if (rc == 0) | |
531f1d45 | 1580 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1581 | return rc; |
e114e473 CS |
1582 | } |
1583 | ||
1584 | /** | |
1585 | * smack_task_setioprio - Smack check on setting ioprio | |
1586 | * @p: the task object | |
1587 | * @ioprio: unused | |
1588 | * | |
1589 | * Return 0 if write access is permitted | |
1590 | */ | |
1591 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1592 | { | |
bcdca225 CS |
1593 | int rc; |
1594 | ||
1595 | rc = cap_task_setioprio(p, ioprio); | |
1596 | if (rc == 0) | |
531f1d45 | 1597 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1598 | return rc; |
e114e473 CS |
1599 | } |
1600 | ||
1601 | /** | |
1602 | * smack_task_getioprio - Smack check on reading ioprio | |
1603 | * @p: the task object | |
1604 | * | |
1605 | * Return 0 if read access is permitted | |
1606 | */ | |
1607 | static int smack_task_getioprio(struct task_struct *p) | |
1608 | { | |
531f1d45 | 1609 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1610 | } |
1611 | ||
1612 | /** | |
1613 | * smack_task_setscheduler - Smack check on setting scheduler | |
1614 | * @p: the task object | |
1615 | * @policy: unused | |
1616 | * @lp: unused | |
1617 | * | |
1618 | * Return 0 if read access is permitted | |
1619 | */ | |
b0ae1981 | 1620 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1621 | { |
bcdca225 CS |
1622 | int rc; |
1623 | ||
b0ae1981 | 1624 | rc = cap_task_setscheduler(p); |
bcdca225 | 1625 | if (rc == 0) |
531f1d45 | 1626 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1627 | return rc; |
e114e473 CS |
1628 | } |
1629 | ||
1630 | /** | |
1631 | * smack_task_getscheduler - Smack check on reading scheduler | |
1632 | * @p: the task object | |
1633 | * | |
1634 | * Return 0 if read access is permitted | |
1635 | */ | |
1636 | static int smack_task_getscheduler(struct task_struct *p) | |
1637 | { | |
531f1d45 | 1638 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1639 | } |
1640 | ||
1641 | /** | |
1642 | * smack_task_movememory - Smack check on moving memory | |
1643 | * @p: the task object | |
1644 | * | |
1645 | * Return 0 if write access is permitted | |
1646 | */ | |
1647 | static int smack_task_movememory(struct task_struct *p) | |
1648 | { | |
531f1d45 | 1649 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1650 | } |
1651 | ||
1652 | /** | |
1653 | * smack_task_kill - Smack check on signal delivery | |
1654 | * @p: the task object | |
1655 | * @info: unused | |
1656 | * @sig: unused | |
1657 | * @secid: identifies the smack to use in lieu of current's | |
1658 | * | |
1659 | * Return 0 if write access is permitted | |
1660 | * | |
1661 | * The secid behavior is an artifact of an SELinux hack | |
1662 | * in the USB code. Someday it may go away. | |
1663 | */ | |
1664 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1665 | int sig, u32 secid) | |
1666 | { | |
ecfcc53f EB |
1667 | struct smk_audit_info ad; |
1668 | ||
1669 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1670 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1671 | /* |
1672 | * Sending a signal requires that the sender | |
1673 | * can write the receiver. | |
1674 | */ | |
1675 | if (secid == 0) | |
676dac4b CS |
1676 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1677 | &ad); | |
e114e473 CS |
1678 | /* |
1679 | * If the secid isn't 0 we're dealing with some USB IO | |
1680 | * specific behavior. This is not clean. For one thing | |
1681 | * we can't take privilege into account. | |
1682 | */ | |
676dac4b CS |
1683 | return smk_access(smack_from_secid(secid), |
1684 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1685 | } |
1686 | ||
1687 | /** | |
1688 | * smack_task_wait - Smack access check for waiting | |
1689 | * @p: task to wait for | |
1690 | * | |
1691 | * Returns 0 if current can wait for p, error code otherwise | |
1692 | */ | |
1693 | static int smack_task_wait(struct task_struct *p) | |
1694 | { | |
ecfcc53f | 1695 | struct smk_audit_info ad; |
676dac4b CS |
1696 | char *sp = smk_of_current(); |
1697 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1698 | int rc; |
1699 | ||
ecfcc53f | 1700 | /* we don't log here, we can be overriden */ |
676dac4b | 1701 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1702 | if (rc == 0) |
ecfcc53f | 1703 | goto out_log; |
e114e473 CS |
1704 | |
1705 | /* | |
1706 | * Allow the operation to succeed if either task | |
1707 | * has privilege to perform operations that might | |
1708 | * account for the smack labels having gotten to | |
1709 | * be different in the first place. | |
1710 | * | |
5cd9c58f | 1711 | * This breaks the strict subject/object access |
e114e473 CS |
1712 | * control ideal, taking the object's privilege |
1713 | * state into account in the decision as well as | |
1714 | * the smack value. | |
1715 | */ | |
5cd9c58f | 1716 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1717 | rc = 0; |
1718 | /* we log only if we didn't get overriden */ | |
1719 | out_log: | |
1720 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1721 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1722 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1723 | return rc; |
1724 | } | |
1725 | ||
1726 | /** | |
1727 | * smack_task_to_inode - copy task smack into the inode blob | |
1728 | * @p: task to copy from | |
251a2a95 | 1729 | * @inode: inode to copy to |
e114e473 CS |
1730 | * |
1731 | * Sets the smack pointer in the inode security blob | |
1732 | */ | |
1733 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1734 | { | |
1735 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1736 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1737 | } |
1738 | ||
1739 | /* | |
1740 | * Socket hooks. | |
1741 | */ | |
1742 | ||
1743 | /** | |
1744 | * smack_sk_alloc_security - Allocate a socket blob | |
1745 | * @sk: the socket | |
1746 | * @family: unused | |
251a2a95 | 1747 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1748 | * |
1749 | * Assign Smack pointers to current | |
1750 | * | |
1751 | * Returns 0 on success, -ENOMEM is there's no memory | |
1752 | */ | |
1753 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1754 | { | |
676dac4b | 1755 | char *csp = smk_of_current(); |
e114e473 CS |
1756 | struct socket_smack *ssp; |
1757 | ||
1758 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1759 | if (ssp == NULL) | |
1760 | return -ENOMEM; | |
1761 | ||
1762 | ssp->smk_in = csp; | |
1763 | ssp->smk_out = csp; | |
272cd7a8 | 1764 | ssp->smk_packet = NULL; |
e114e473 CS |
1765 | |
1766 | sk->sk_security = ssp; | |
1767 | ||
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | /** | |
1772 | * smack_sk_free_security - Free a socket blob | |
1773 | * @sk: the socket | |
1774 | * | |
1775 | * Clears the blob pointer | |
1776 | */ | |
1777 | static void smack_sk_free_security(struct sock *sk) | |
1778 | { | |
1779 | kfree(sk->sk_security); | |
1780 | } | |
1781 | ||
07feee8f PM |
1782 | /** |
1783 | * smack_host_label - check host based restrictions | |
1784 | * @sip: the object end | |
1785 | * | |
1786 | * looks for host based access restrictions | |
1787 | * | |
1788 | * This version will only be appropriate for really small sets of single label | |
1789 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1790 | * taken before calling this function. | |
1791 | * | |
1792 | * Returns the label of the far end or NULL if it's not special. | |
1793 | */ | |
1794 | static char *smack_host_label(struct sockaddr_in *sip) | |
1795 | { | |
1796 | struct smk_netlbladdr *snp; | |
1797 | struct in_addr *siap = &sip->sin_addr; | |
1798 | ||
1799 | if (siap->s_addr == 0) | |
1800 | return NULL; | |
1801 | ||
1802 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1803 | /* | |
1804 | * we break after finding the first match because | |
1805 | * the list is sorted from longest to shortest mask | |
1806 | * so we have found the most specific match | |
1807 | */ | |
1808 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1809 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1810 | /* we have found the special CIPSO option */ | |
1811 | if (snp->smk_label == smack_cipso_option) | |
1812 | return NULL; | |
07feee8f | 1813 | return snp->smk_label; |
4303154e | 1814 | } |
07feee8f PM |
1815 | |
1816 | return NULL; | |
1817 | } | |
1818 | ||
e114e473 CS |
1819 | /** |
1820 | * smack_set_catset - convert a capset to netlabel mls categories | |
1821 | * @catset: the Smack categories | |
1822 | * @sap: where to put the netlabel categories | |
1823 | * | |
1824 | * Allocates and fills attr.mls.cat | |
1825 | */ | |
1826 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1827 | { | |
1828 | unsigned char *cp; | |
1829 | unsigned char m; | |
1830 | int cat; | |
1831 | int rc; | |
1832 | int byte; | |
1833 | ||
c60264c4 | 1834 | if (!catset) |
e114e473 CS |
1835 | return; |
1836 | ||
1837 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1838 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1839 | sap->attr.mls.cat->startbit = 0; | |
1840 | ||
1841 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1842 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1843 | if ((m & *cp) == 0) | |
1844 | continue; | |
1845 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1846 | cat, GFP_ATOMIC); | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | /** | |
1851 | * smack_to_secattr - fill a secattr from a smack value | |
1852 | * @smack: the smack value | |
1853 | * @nlsp: where the result goes | |
1854 | * | |
1855 | * Casey says that CIPSO is good enough for now. | |
1856 | * It can be used to effect. | |
1857 | * It can also be abused to effect when necessary. | |
25985edc | 1858 | * Apologies to the TSIG group in general and GW in particular. |
e114e473 CS |
1859 | */ |
1860 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1861 | { | |
1862 | struct smack_cipso cipso; | |
1863 | int rc; | |
1864 | ||
6d3dc07c CS |
1865 | nlsp->domain = smack; |
1866 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1867 | |
6d3dc07c CS |
1868 | rc = smack_to_cipso(smack, &cipso); |
1869 | if (rc == 0) { | |
1870 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1871 | smack_set_catset(cipso.smk_catset, nlsp); | |
1872 | } else { | |
1873 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1874 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1875 | } |
1876 | } | |
1877 | ||
1878 | /** | |
1879 | * smack_netlabel - Set the secattr on a socket | |
1880 | * @sk: the socket | |
6d3dc07c | 1881 | * @labeled: socket label scheme |
e114e473 CS |
1882 | * |
1883 | * Convert the outbound smack value (smk_out) to a | |
1884 | * secattr and attach it to the socket. | |
1885 | * | |
1886 | * Returns 0 on success or an error code | |
1887 | */ | |
6d3dc07c | 1888 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1889 | { |
07feee8f | 1890 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1891 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1892 | int rc = 0; |
e114e473 | 1893 | |
6d3dc07c CS |
1894 | /* |
1895 | * Usually the netlabel code will handle changing the | |
1896 | * packet labeling based on the label. | |
1897 | * The case of a single label host is different, because | |
1898 | * a single label host should never get a labeled packet | |
1899 | * even though the label is usually associated with a packet | |
1900 | * label. | |
1901 | */ | |
1902 | local_bh_disable(); | |
1903 | bh_lock_sock_nested(sk); | |
1904 | ||
1905 | if (ssp->smk_out == smack_net_ambient || | |
1906 | labeled == SMACK_UNLABELED_SOCKET) | |
1907 | netlbl_sock_delattr(sk); | |
1908 | else { | |
1909 | netlbl_secattr_init(&secattr); | |
1910 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1911 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1912 | netlbl_secattr_destroy(&secattr); |
1913 | } | |
1914 | ||
1915 | bh_unlock_sock(sk); | |
1916 | local_bh_enable(); | |
4bc87e62 | 1917 | |
e114e473 CS |
1918 | return rc; |
1919 | } | |
1920 | ||
07feee8f PM |
1921 | /** |
1922 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1923 | * @sk: the socket | |
1924 | * @sap: the destination address | |
1925 | * | |
1926 | * Set the correct secattr for the given socket based on the destination | |
1927 | * address and perform any outbound access checks needed. | |
1928 | * | |
1929 | * Returns 0 on success or an error code. | |
1930 | * | |
1931 | */ | |
1932 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1933 | { | |
1934 | int rc; | |
1935 | int sk_lbl; | |
1936 | char *hostsp; | |
1937 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1938 | struct smk_audit_info ad; |
07feee8f PM |
1939 | |
1940 | rcu_read_lock(); | |
1941 | hostsp = smack_host_label(sap); | |
1942 | if (hostsp != NULL) { | |
1943 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1944 | #ifdef CONFIG_AUDIT |
1945 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1946 | ad.a.u.net.family = sap->sin_family; | |
1947 | ad.a.u.net.dport = sap->sin_port; | |
1948 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1949 | #endif | |
1950 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1951 | } else { |
1952 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1953 | rc = 0; | |
1954 | } | |
1955 | rcu_read_unlock(); | |
1956 | if (rc != 0) | |
1957 | return rc; | |
1958 | ||
1959 | return smack_netlabel(sk, sk_lbl); | |
1960 | } | |
1961 | ||
e114e473 CS |
1962 | /** |
1963 | * smack_inode_setsecurity - set smack xattrs | |
1964 | * @inode: the object | |
1965 | * @name: attribute name | |
1966 | * @value: attribute value | |
1967 | * @size: size of the attribute | |
1968 | * @flags: unused | |
1969 | * | |
1970 | * Sets the named attribute in the appropriate blob | |
1971 | * | |
1972 | * Returns 0 on success, or an error code | |
1973 | */ | |
1974 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1975 | const void *value, size_t size, int flags) | |
1976 | { | |
1977 | char *sp; | |
1978 | struct inode_smack *nsp = inode->i_security; | |
1979 | struct socket_smack *ssp; | |
1980 | struct socket *sock; | |
4bc87e62 | 1981 | int rc = 0; |
e114e473 | 1982 | |
4303154e | 1983 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1984 | return -EACCES; |
1985 | ||
1986 | sp = smk_import(value, size); | |
1987 | if (sp == NULL) | |
1988 | return -EINVAL; | |
1989 | ||
1990 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1991 | nsp->smk_inode = sp; | |
ddd29ec6 | 1992 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1993 | return 0; |
1994 | } | |
1995 | /* | |
1996 | * The rest of the Smack xattrs are only on sockets. | |
1997 | */ | |
1998 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1999 | return -EOPNOTSUPP; | |
2000 | ||
2001 | sock = SOCKET_I(inode); | |
2e1d146a | 2002 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2003 | return -EOPNOTSUPP; |
2004 | ||
2005 | ssp = sock->sk->sk_security; | |
2006 | ||
2007 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
2008 | ssp->smk_in = sp; | |
2009 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
2010 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
2011 | if (sock->sk->sk_family != PF_UNIX) { |
2012 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
2013 | if (rc != 0) | |
2014 | printk(KERN_WARNING | |
2015 | "Smack: \"%s\" netlbl error %d.\n", | |
2016 | __func__, -rc); | |
2017 | } | |
e114e473 CS |
2018 | } else |
2019 | return -EOPNOTSUPP; | |
2020 | ||
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | /** | |
2025 | * smack_socket_post_create - finish socket setup | |
2026 | * @sock: the socket | |
2027 | * @family: protocol family | |
2028 | * @type: unused | |
2029 | * @protocol: unused | |
2030 | * @kern: unused | |
2031 | * | |
2032 | * Sets the netlabel information on the socket | |
2033 | * | |
2034 | * Returns 0 on success, and error code otherwise | |
2035 | */ | |
2036 | static int smack_socket_post_create(struct socket *sock, int family, | |
2037 | int type, int protocol, int kern) | |
2038 | { | |
2e1d146a | 2039 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2040 | return 0; |
2041 | /* | |
2042 | * Set the outbound netlbl. | |
2043 | */ | |
6d3dc07c CS |
2044 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2045 | } | |
2046 | ||
6d3dc07c CS |
2047 | /** |
2048 | * smack_socket_connect - connect access check | |
2049 | * @sock: the socket | |
2050 | * @sap: the other end | |
2051 | * @addrlen: size of sap | |
2052 | * | |
2053 | * Verifies that a connection may be possible | |
2054 | * | |
2055 | * Returns 0 on success, and error code otherwise | |
2056 | */ | |
2057 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2058 | int addrlen) | |
2059 | { | |
6d3dc07c CS |
2060 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
2061 | return 0; | |
6d3dc07c CS |
2062 | if (addrlen < sizeof(struct sockaddr_in)) |
2063 | return -EINVAL; | |
2064 | ||
07feee8f | 2065 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
2066 | } |
2067 | ||
2068 | /** | |
2069 | * smack_flags_to_may - convert S_ to MAY_ values | |
2070 | * @flags: the S_ value | |
2071 | * | |
2072 | * Returns the equivalent MAY_ value | |
2073 | */ | |
2074 | static int smack_flags_to_may(int flags) | |
2075 | { | |
2076 | int may = 0; | |
2077 | ||
2078 | if (flags & S_IRUGO) | |
2079 | may |= MAY_READ; | |
2080 | if (flags & S_IWUGO) | |
2081 | may |= MAY_WRITE; | |
2082 | if (flags & S_IXUGO) | |
2083 | may |= MAY_EXEC; | |
2084 | ||
2085 | return may; | |
2086 | } | |
2087 | ||
2088 | /** | |
2089 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2090 | * @msg: the object | |
2091 | * | |
2092 | * Returns 0 | |
2093 | */ | |
2094 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2095 | { | |
676dac4b | 2096 | msg->security = smk_of_current(); |
e114e473 CS |
2097 | return 0; |
2098 | } | |
2099 | ||
2100 | /** | |
2101 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2102 | * @msg: the object | |
2103 | * | |
2104 | * Clears the blob pointer | |
2105 | */ | |
2106 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2107 | { | |
2108 | msg->security = NULL; | |
2109 | } | |
2110 | ||
2111 | /** | |
2112 | * smack_of_shm - the smack pointer for the shm | |
2113 | * @shp: the object | |
2114 | * | |
2115 | * Returns a pointer to the smack value | |
2116 | */ | |
2117 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2118 | { | |
2119 | return (char *)shp->shm_perm.security; | |
2120 | } | |
2121 | ||
2122 | /** | |
2123 | * smack_shm_alloc_security - Set the security blob for shm | |
2124 | * @shp: the object | |
2125 | * | |
2126 | * Returns 0 | |
2127 | */ | |
2128 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2129 | { | |
2130 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2131 | ||
676dac4b | 2132 | isp->security = smk_of_current(); |
e114e473 CS |
2133 | return 0; |
2134 | } | |
2135 | ||
2136 | /** | |
2137 | * smack_shm_free_security - Clear the security blob for shm | |
2138 | * @shp: the object | |
2139 | * | |
2140 | * Clears the blob pointer | |
2141 | */ | |
2142 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2143 | { | |
2144 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2145 | ||
2146 | isp->security = NULL; | |
2147 | } | |
2148 | ||
ecfcc53f EB |
2149 | /** |
2150 | * smk_curacc_shm : check if current has access on shm | |
2151 | * @shp : the object | |
2152 | * @access : access requested | |
2153 | * | |
2154 | * Returns 0 if current has the requested access, error code otherwise | |
2155 | */ | |
2156 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2157 | { | |
2158 | char *ssp = smack_of_shm(shp); | |
2159 | struct smk_audit_info ad; | |
2160 | ||
2161 | #ifdef CONFIG_AUDIT | |
2162 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2163 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2164 | #endif | |
2165 | return smk_curacc(ssp, access, &ad); | |
2166 | } | |
2167 | ||
e114e473 CS |
2168 | /** |
2169 | * smack_shm_associate - Smack access check for shm | |
2170 | * @shp: the object | |
2171 | * @shmflg: access requested | |
2172 | * | |
2173 | * Returns 0 if current has the requested access, error code otherwise | |
2174 | */ | |
2175 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2176 | { | |
e114e473 CS |
2177 | int may; |
2178 | ||
2179 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2180 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2181 | } |
2182 | ||
2183 | /** | |
2184 | * smack_shm_shmctl - Smack access check for shm | |
2185 | * @shp: the object | |
2186 | * @cmd: what it wants to do | |
2187 | * | |
2188 | * Returns 0 if current has the requested access, error code otherwise | |
2189 | */ | |
2190 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2191 | { | |
e114e473 CS |
2192 | int may; |
2193 | ||
2194 | switch (cmd) { | |
2195 | case IPC_STAT: | |
2196 | case SHM_STAT: | |
2197 | may = MAY_READ; | |
2198 | break; | |
2199 | case IPC_SET: | |
2200 | case SHM_LOCK: | |
2201 | case SHM_UNLOCK: | |
2202 | case IPC_RMID: | |
2203 | may = MAY_READWRITE; | |
2204 | break; | |
2205 | case IPC_INFO: | |
2206 | case SHM_INFO: | |
2207 | /* | |
2208 | * System level information. | |
2209 | */ | |
2210 | return 0; | |
2211 | default: | |
2212 | return -EINVAL; | |
2213 | } | |
ecfcc53f | 2214 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2215 | } |
2216 | ||
2217 | /** | |
2218 | * smack_shm_shmat - Smack access for shmat | |
2219 | * @shp: the object | |
2220 | * @shmaddr: unused | |
2221 | * @shmflg: access requested | |
2222 | * | |
2223 | * Returns 0 if current has the requested access, error code otherwise | |
2224 | */ | |
2225 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2226 | int shmflg) | |
2227 | { | |
e114e473 CS |
2228 | int may; |
2229 | ||
2230 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2231 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2232 | } |
2233 | ||
2234 | /** | |
2235 | * smack_of_sem - the smack pointer for the sem | |
2236 | * @sma: the object | |
2237 | * | |
2238 | * Returns a pointer to the smack value | |
2239 | */ | |
2240 | static char *smack_of_sem(struct sem_array *sma) | |
2241 | { | |
2242 | return (char *)sma->sem_perm.security; | |
2243 | } | |
2244 | ||
2245 | /** | |
2246 | * smack_sem_alloc_security - Set the security blob for sem | |
2247 | * @sma: the object | |
2248 | * | |
2249 | * Returns 0 | |
2250 | */ | |
2251 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2252 | { | |
2253 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2254 | ||
676dac4b | 2255 | isp->security = smk_of_current(); |
e114e473 CS |
2256 | return 0; |
2257 | } | |
2258 | ||
2259 | /** | |
2260 | * smack_sem_free_security - Clear the security blob for sem | |
2261 | * @sma: the object | |
2262 | * | |
2263 | * Clears the blob pointer | |
2264 | */ | |
2265 | static void smack_sem_free_security(struct sem_array *sma) | |
2266 | { | |
2267 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2268 | ||
2269 | isp->security = NULL; | |
2270 | } | |
2271 | ||
ecfcc53f EB |
2272 | /** |
2273 | * smk_curacc_sem : check if current has access on sem | |
2274 | * @sma : the object | |
2275 | * @access : access requested | |
2276 | * | |
2277 | * Returns 0 if current has the requested access, error code otherwise | |
2278 | */ | |
2279 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2280 | { | |
2281 | char *ssp = smack_of_sem(sma); | |
2282 | struct smk_audit_info ad; | |
2283 | ||
2284 | #ifdef CONFIG_AUDIT | |
2285 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2286 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2287 | #endif | |
2288 | return smk_curacc(ssp, access, &ad); | |
2289 | } | |
2290 | ||
e114e473 CS |
2291 | /** |
2292 | * smack_sem_associate - Smack access check for sem | |
2293 | * @sma: the object | |
2294 | * @semflg: access requested | |
2295 | * | |
2296 | * Returns 0 if current has the requested access, error code otherwise | |
2297 | */ | |
2298 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2299 | { | |
e114e473 CS |
2300 | int may; |
2301 | ||
2302 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2303 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2304 | } |
2305 | ||
2306 | /** | |
2307 | * smack_sem_shmctl - Smack access check for sem | |
2308 | * @sma: the object | |
2309 | * @cmd: what it wants to do | |
2310 | * | |
2311 | * Returns 0 if current has the requested access, error code otherwise | |
2312 | */ | |
2313 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2314 | { | |
e114e473 CS |
2315 | int may; |
2316 | ||
2317 | switch (cmd) { | |
2318 | case GETPID: | |
2319 | case GETNCNT: | |
2320 | case GETZCNT: | |
2321 | case GETVAL: | |
2322 | case GETALL: | |
2323 | case IPC_STAT: | |
2324 | case SEM_STAT: | |
2325 | may = MAY_READ; | |
2326 | break; | |
2327 | case SETVAL: | |
2328 | case SETALL: | |
2329 | case IPC_RMID: | |
2330 | case IPC_SET: | |
2331 | may = MAY_READWRITE; | |
2332 | break; | |
2333 | case IPC_INFO: | |
2334 | case SEM_INFO: | |
2335 | /* | |
2336 | * System level information | |
2337 | */ | |
2338 | return 0; | |
2339 | default: | |
2340 | return -EINVAL; | |
2341 | } | |
2342 | ||
ecfcc53f | 2343 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2344 | } |
2345 | ||
2346 | /** | |
2347 | * smack_sem_semop - Smack checks of semaphore operations | |
2348 | * @sma: the object | |
2349 | * @sops: unused | |
2350 | * @nsops: unused | |
2351 | * @alter: unused | |
2352 | * | |
2353 | * Treated as read and write in all cases. | |
2354 | * | |
2355 | * Returns 0 if access is allowed, error code otherwise | |
2356 | */ | |
2357 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2358 | unsigned nsops, int alter) | |
2359 | { | |
ecfcc53f | 2360 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2361 | } |
2362 | ||
2363 | /** | |
2364 | * smack_msg_alloc_security - Set the security blob for msg | |
2365 | * @msq: the object | |
2366 | * | |
2367 | * Returns 0 | |
2368 | */ | |
2369 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2370 | { | |
2371 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2372 | ||
676dac4b | 2373 | kisp->security = smk_of_current(); |
e114e473 CS |
2374 | return 0; |
2375 | } | |
2376 | ||
2377 | /** | |
2378 | * smack_msg_free_security - Clear the security blob for msg | |
2379 | * @msq: the object | |
2380 | * | |
2381 | * Clears the blob pointer | |
2382 | */ | |
2383 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2384 | { | |
2385 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2386 | ||
2387 | kisp->security = NULL; | |
2388 | } | |
2389 | ||
2390 | /** | |
2391 | * smack_of_msq - the smack pointer for the msq | |
2392 | * @msq: the object | |
2393 | * | |
2394 | * Returns a pointer to the smack value | |
2395 | */ | |
2396 | static char *smack_of_msq(struct msg_queue *msq) | |
2397 | { | |
2398 | return (char *)msq->q_perm.security; | |
2399 | } | |
2400 | ||
ecfcc53f EB |
2401 | /** |
2402 | * smk_curacc_msq : helper to check if current has access on msq | |
2403 | * @msq : the msq | |
2404 | * @access : access requested | |
2405 | * | |
2406 | * return 0 if current has access, error otherwise | |
2407 | */ | |
2408 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2409 | { | |
2410 | char *msp = smack_of_msq(msq); | |
2411 | struct smk_audit_info ad; | |
2412 | ||
2413 | #ifdef CONFIG_AUDIT | |
2414 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2415 | ad.a.u.ipc_id = msq->q_perm.id; | |
2416 | #endif | |
2417 | return smk_curacc(msp, access, &ad); | |
2418 | } | |
2419 | ||
e114e473 CS |
2420 | /** |
2421 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2422 | * @msq: the object | |
2423 | * @msqflg: access requested | |
2424 | * | |
2425 | * Returns 0 if current has the requested access, error code otherwise | |
2426 | */ | |
2427 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2428 | { | |
e114e473 CS |
2429 | int may; |
2430 | ||
2431 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2432 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2433 | } |
2434 | ||
2435 | /** | |
2436 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2437 | * @msq: the object | |
2438 | * @cmd: what it wants to do | |
2439 | * | |
2440 | * Returns 0 if current has the requested access, error code otherwise | |
2441 | */ | |
2442 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2443 | { | |
e114e473 CS |
2444 | int may; |
2445 | ||
2446 | switch (cmd) { | |
2447 | case IPC_STAT: | |
2448 | case MSG_STAT: | |
2449 | may = MAY_READ; | |
2450 | break; | |
2451 | case IPC_SET: | |
2452 | case IPC_RMID: | |
2453 | may = MAY_READWRITE; | |
2454 | break; | |
2455 | case IPC_INFO: | |
2456 | case MSG_INFO: | |
2457 | /* | |
2458 | * System level information | |
2459 | */ | |
2460 | return 0; | |
2461 | default: | |
2462 | return -EINVAL; | |
2463 | } | |
2464 | ||
ecfcc53f | 2465 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2466 | } |
2467 | ||
2468 | /** | |
2469 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2470 | * @msq: the object | |
2471 | * @msg: unused | |
2472 | * @msqflg: access requested | |
2473 | * | |
2474 | * Returns 0 if current has the requested access, error code otherwise | |
2475 | */ | |
2476 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2477 | int msqflg) | |
2478 | { | |
ecfcc53f | 2479 | int may; |
e114e473 | 2480 | |
ecfcc53f EB |
2481 | may = smack_flags_to_may(msqflg); |
2482 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2483 | } |
2484 | ||
2485 | /** | |
2486 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2487 | * @msq: the object | |
2488 | * @msg: unused | |
2489 | * @target: unused | |
2490 | * @type: unused | |
2491 | * @mode: unused | |
2492 | * | |
2493 | * Returns 0 if current has read and write access, error code otherwise | |
2494 | */ | |
2495 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2496 | struct task_struct *target, long type, int mode) | |
2497 | { | |
ecfcc53f | 2498 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2499 | } |
2500 | ||
2501 | /** | |
2502 | * smack_ipc_permission - Smack access for ipc_permission() | |
2503 | * @ipp: the object permissions | |
2504 | * @flag: access requested | |
2505 | * | |
2506 | * Returns 0 if current has read and write access, error code otherwise | |
2507 | */ | |
2508 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2509 | { | |
2510 | char *isp = ipp->security; | |
ecfcc53f EB |
2511 | int may = smack_flags_to_may(flag); |
2512 | struct smk_audit_info ad; | |
e114e473 | 2513 | |
ecfcc53f EB |
2514 | #ifdef CONFIG_AUDIT |
2515 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2516 | ad.a.u.ipc_id = ipp->id; | |
2517 | #endif | |
2518 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2519 | } |
2520 | ||
d20bdda6 AD |
2521 | /** |
2522 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2523 | * @ipp: the object permissions |
d20bdda6 AD |
2524 | * @secid: where result will be saved |
2525 | */ | |
2526 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2527 | { | |
2528 | char *smack = ipp->security; | |
2529 | ||
2530 | *secid = smack_to_secid(smack); | |
2531 | } | |
2532 | ||
e114e473 CS |
2533 | /** |
2534 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2535 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2536 | * @inode: the object |
2537 | * | |
2538 | * Set the inode's security blob if it hasn't been done already. | |
2539 | */ | |
2540 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2541 | { | |
2542 | struct super_block *sbp; | |
2543 | struct superblock_smack *sbsp; | |
2544 | struct inode_smack *isp; | |
676dac4b | 2545 | char *csp = smk_of_current(); |
e114e473 CS |
2546 | char *fetched; |
2547 | char *final; | |
5c6d1125 JS |
2548 | char trattr[TRANS_TRUE_SIZE]; |
2549 | int transflag = 0; | |
e114e473 CS |
2550 | struct dentry *dp; |
2551 | ||
2552 | if (inode == NULL) | |
2553 | return; | |
2554 | ||
2555 | isp = inode->i_security; | |
2556 | ||
2557 | mutex_lock(&isp->smk_lock); | |
2558 | /* | |
2559 | * If the inode is already instantiated | |
2560 | * take the quick way out | |
2561 | */ | |
2562 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2563 | goto unlockandout; | |
2564 | ||
2565 | sbp = inode->i_sb; | |
2566 | sbsp = sbp->s_security; | |
2567 | /* | |
2568 | * We're going to use the superblock default label | |
2569 | * if there's no label on the file. | |
2570 | */ | |
2571 | final = sbsp->smk_default; | |
2572 | ||
e97dcb0e CS |
2573 | /* |
2574 | * If this is the root inode the superblock | |
2575 | * may be in the process of initialization. | |
2576 | * If that is the case use the root value out | |
2577 | * of the superblock. | |
2578 | */ | |
2579 | if (opt_dentry->d_parent == opt_dentry) { | |
2580 | isp->smk_inode = sbsp->smk_root; | |
2581 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2582 | goto unlockandout; | |
2583 | } | |
2584 | ||
e114e473 CS |
2585 | /* |
2586 | * This is pretty hackish. | |
2587 | * Casey says that we shouldn't have to do | |
2588 | * file system specific code, but it does help | |
2589 | * with keeping it simple. | |
2590 | */ | |
2591 | switch (sbp->s_magic) { | |
2592 | case SMACK_MAGIC: | |
2593 | /* | |
25985edc | 2594 | * Casey says that it's a little embarrassing |
e114e473 CS |
2595 | * that the smack file system doesn't do |
2596 | * extended attributes. | |
2597 | */ | |
2598 | final = smack_known_star.smk_known; | |
2599 | break; | |
2600 | case PIPEFS_MAGIC: | |
2601 | /* | |
2602 | * Casey says pipes are easy (?) | |
2603 | */ | |
2604 | final = smack_known_star.smk_known; | |
2605 | break; | |
2606 | case DEVPTS_SUPER_MAGIC: | |
2607 | /* | |
2608 | * devpts seems content with the label of the task. | |
2609 | * Programs that change smack have to treat the | |
2610 | * pty with respect. | |
2611 | */ | |
2612 | final = csp; | |
2613 | break; | |
2614 | case SOCKFS_MAGIC: | |
2615 | /* | |
b4e0d5f0 CS |
2616 | * Socket access is controlled by the socket |
2617 | * structures associated with the task involved. | |
e114e473 | 2618 | */ |
b4e0d5f0 | 2619 | final = smack_known_star.smk_known; |
e114e473 CS |
2620 | break; |
2621 | case PROC_SUPER_MAGIC: | |
2622 | /* | |
2623 | * Casey says procfs appears not to care. | |
2624 | * The superblock default suffices. | |
2625 | */ | |
2626 | break; | |
2627 | case TMPFS_MAGIC: | |
2628 | /* | |
2629 | * Device labels should come from the filesystem, | |
2630 | * but watch out, because they're volitile, | |
2631 | * getting recreated on every reboot. | |
2632 | */ | |
2633 | final = smack_known_star.smk_known; | |
2634 | /* | |
2635 | * No break. | |
2636 | * | |
2637 | * If a smack value has been set we want to use it, | |
2638 | * but since tmpfs isn't giving us the opportunity | |
2639 | * to set mount options simulate setting the | |
2640 | * superblock default. | |
2641 | */ | |
2642 | default: | |
2643 | /* | |
2644 | * This isn't an understood special case. | |
2645 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2646 | */ |
2647 | ||
2648 | /* | |
2649 | * UNIX domain sockets use lower level socket data. | |
2650 | */ | |
2651 | if (S_ISSOCK(inode->i_mode)) { | |
2652 | final = smack_known_star.smk_known; | |
2653 | break; | |
2654 | } | |
2655 | /* | |
e114e473 CS |
2656 | * No xattr support means, alas, no SMACK label. |
2657 | * Use the aforeapplied default. | |
2658 | * It would be curious if the label of the task | |
2659 | * does not match that assigned. | |
2660 | */ | |
2661 | if (inode->i_op->getxattr == NULL) | |
2662 | break; | |
2663 | /* | |
2664 | * Get the dentry for xattr. | |
2665 | */ | |
3e62cbb8 | 2666 | dp = dget(opt_dentry); |
676dac4b | 2667 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
5c6d1125 | 2668 | if (fetched != NULL) { |
e114e473 | 2669 | final = fetched; |
5c6d1125 JS |
2670 | if (S_ISDIR(inode->i_mode)) { |
2671 | trattr[0] = '\0'; | |
2672 | inode->i_op->getxattr(dp, | |
2673 | XATTR_NAME_SMACKTRANSMUTE, | |
2674 | trattr, TRANS_TRUE_SIZE); | |
2675 | if (strncmp(trattr, TRANS_TRUE, | |
2676 | TRANS_TRUE_SIZE) == 0) | |
2677 | transflag = SMK_INODE_TRANSMUTE; | |
2678 | } | |
2679 | } | |
2680 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2681 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2682 | |
e114e473 CS |
2683 | dput(dp); |
2684 | break; | |
2685 | } | |
2686 | ||
2687 | if (final == NULL) | |
2688 | isp->smk_inode = csp; | |
2689 | else | |
2690 | isp->smk_inode = final; | |
2691 | ||
5c6d1125 | 2692 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2693 | |
2694 | unlockandout: | |
2695 | mutex_unlock(&isp->smk_lock); | |
2696 | return; | |
2697 | } | |
2698 | ||
2699 | /** | |
2700 | * smack_getprocattr - Smack process attribute access | |
2701 | * @p: the object task | |
2702 | * @name: the name of the attribute in /proc/.../attr | |
2703 | * @value: where to put the result | |
2704 | * | |
2705 | * Places a copy of the task Smack into value | |
2706 | * | |
2707 | * Returns the length of the smack label or an error code | |
2708 | */ | |
2709 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2710 | { | |
2711 | char *cp; | |
2712 | int slen; | |
2713 | ||
2714 | if (strcmp(name, "current") != 0) | |
2715 | return -EINVAL; | |
2716 | ||
676dac4b | 2717 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2718 | if (cp == NULL) |
2719 | return -ENOMEM; | |
2720 | ||
2721 | slen = strlen(cp); | |
2722 | *value = cp; | |
2723 | return slen; | |
2724 | } | |
2725 | ||
2726 | /** | |
2727 | * smack_setprocattr - Smack process attribute setting | |
2728 | * @p: the object task | |
2729 | * @name: the name of the attribute in /proc/.../attr | |
2730 | * @value: the value to set | |
2731 | * @size: the size of the value | |
2732 | * | |
2733 | * Sets the Smack value of the task. Only setting self | |
2734 | * is permitted and only with privilege | |
2735 | * | |
2736 | * Returns the length of the smack label or an error code | |
2737 | */ | |
2738 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2739 | void *value, size_t size) | |
2740 | { | |
7898e1f8 | 2741 | int rc; |
676dac4b | 2742 | struct task_smack *tsp; |
5c6d1125 | 2743 | struct task_smack *oldtsp; |
d84f4f99 | 2744 | struct cred *new; |
e114e473 CS |
2745 | char *newsmack; |
2746 | ||
e114e473 CS |
2747 | /* |
2748 | * Changing another process' Smack value is too dangerous | |
2749 | * and supports no sane use case. | |
2750 | */ | |
2751 | if (p != current) | |
2752 | return -EPERM; | |
2753 | ||
5cd9c58f DH |
2754 | if (!capable(CAP_MAC_ADMIN)) |
2755 | return -EPERM; | |
2756 | ||
e114e473 CS |
2757 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2758 | return -EINVAL; | |
2759 | ||
2760 | if (strcmp(name, "current") != 0) | |
2761 | return -EINVAL; | |
2762 | ||
2763 | newsmack = smk_import(value, size); | |
2764 | if (newsmack == NULL) | |
2765 | return -EINVAL; | |
2766 | ||
6d3dc07c CS |
2767 | /* |
2768 | * No process is ever allowed the web ("@") label. | |
2769 | */ | |
2770 | if (newsmack == smack_known_web.smk_known) | |
2771 | return -EPERM; | |
2772 | ||
5c6d1125 | 2773 | oldtsp = p->cred->security; |
d84f4f99 | 2774 | new = prepare_creds(); |
6d3dc07c | 2775 | if (new == NULL) |
d84f4f99 | 2776 | return -ENOMEM; |
7898e1f8 CS |
2777 | |
2778 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2779 | if (tsp == NULL) { |
2780 | kfree(new); | |
2781 | return -ENOMEM; | |
2782 | } | |
7898e1f8 CS |
2783 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2784 | if (rc != 0) | |
2785 | return rc; | |
2786 | ||
676dac4b | 2787 | new->security = tsp; |
d84f4f99 | 2788 | commit_creds(new); |
e114e473 CS |
2789 | return size; |
2790 | } | |
2791 | ||
2792 | /** | |
2793 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2794 | * @sock: one sock |
2795 | * @other: the other sock | |
e114e473 CS |
2796 | * @newsk: unused |
2797 | * | |
2798 | * Return 0 if a subject with the smack of sock could access | |
2799 | * an object with the smack of other, otherwise an error code | |
2800 | */ | |
3610cda5 DM |
2801 | static int smack_unix_stream_connect(struct sock *sock, |
2802 | struct sock *other, struct sock *newsk) | |
e114e473 | 2803 | { |
d2e7ad19 JM |
2804 | struct socket_smack *ssp = sock->sk_security; |
2805 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2806 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2807 | struct smk_audit_info ad; |
b4e0d5f0 | 2808 | int rc = 0; |
e114e473 | 2809 | |
ecfcc53f | 2810 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
3610cda5 | 2811 | smk_ad_setfield_u_net_sk(&ad, other); |
b4e0d5f0 CS |
2812 | |
2813 | if (!capable(CAP_MAC_OVERRIDE)) | |
2814 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2815 | ||
975d5e55 CS |
2816 | /* |
2817 | * Cross reference the peer labels for SO_PEERSEC. | |
2818 | */ | |
2819 | if (rc == 0) { | |
2820 | nsp->smk_packet = ssp->smk_out; | |
2821 | ssp->smk_packet = osp->smk_out; | |
2822 | } | |
2823 | ||
b4e0d5f0 | 2824 | return rc; |
e114e473 CS |
2825 | } |
2826 | ||
2827 | /** | |
2828 | * smack_unix_may_send - Smack access on UDS | |
2829 | * @sock: one socket | |
2830 | * @other: the other socket | |
2831 | * | |
2832 | * Return 0 if a subject with the smack of sock could access | |
2833 | * an object with the smack of other, otherwise an error code | |
2834 | */ | |
2835 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2836 | { | |
b4e0d5f0 CS |
2837 | struct socket_smack *ssp = sock->sk->sk_security; |
2838 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2839 | struct smk_audit_info ad; |
b4e0d5f0 | 2840 | int rc = 0; |
e114e473 | 2841 | |
ecfcc53f EB |
2842 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2843 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2844 | |
2845 | if (!capable(CAP_MAC_OVERRIDE)) | |
2846 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2847 | ||
2848 | return rc; | |
e114e473 CS |
2849 | } |
2850 | ||
6d3dc07c CS |
2851 | /** |
2852 | * smack_socket_sendmsg - Smack check based on destination host | |
2853 | * @sock: the socket | |
251a2a95 | 2854 | * @msg: the message |
6d3dc07c CS |
2855 | * @size: the size of the message |
2856 | * | |
2857 | * Return 0 if the current subject can write to the destination | |
2858 | * host. This is only a question if the destination is a single | |
2859 | * label host. | |
2860 | */ | |
2861 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2862 | int size) | |
2863 | { | |
2864 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2865 | |
2866 | /* | |
2867 | * Perfectly reasonable for this to be NULL | |
2868 | */ | |
da34d424 | 2869 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2870 | return 0; |
2871 | ||
07feee8f | 2872 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2873 | } |
2874 | ||
e114e473 | 2875 | /** |
251a2a95 | 2876 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 2877 | * @sap: netlabel secattr |
272cd7a8 | 2878 | * @ssp: socket security information |
e114e473 | 2879 | * |
272cd7a8 | 2880 | * Returns a pointer to a Smack label found on the label list. |
e114e473 | 2881 | */ |
272cd7a8 CS |
2882 | static char *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
2883 | struct socket_smack *ssp) | |
e114e473 | 2884 | { |
272cd7a8 | 2885 | struct smack_known *skp; |
e114e473 | 2886 | char smack[SMK_LABELLEN]; |
6d3dc07c | 2887 | char *sp; |
e114e473 CS |
2888 | int pcat; |
2889 | ||
6d3dc07c | 2890 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2891 | /* |
6d3dc07c | 2892 | * Looks like a CIPSO packet. |
e114e473 CS |
2893 | * If there are flags but no level netlabel isn't |
2894 | * behaving the way we expect it to. | |
2895 | * | |
6d3dc07c | 2896 | * Get the categories, if any |
e114e473 CS |
2897 | * Without guidance regarding the smack value |
2898 | * for the packet fall back on the network | |
2899 | * ambient value. | |
2900 | */ | |
6d3dc07c CS |
2901 | memset(smack, '\0', SMK_LABELLEN); |
2902 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2903 | for (pcat = -1;;) { | |
2904 | pcat = netlbl_secattr_catmap_walk( | |
2905 | sap->attr.mls.cat, pcat + 1); | |
2906 | if (pcat < 0) | |
2907 | break; | |
2908 | smack_catset_bit(pcat, smack); | |
2909 | } | |
2910 | /* | |
2911 | * If it is CIPSO using smack direct mapping | |
2912 | * we are already done. WeeHee. | |
2913 | */ | |
2914 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
272cd7a8 CS |
2915 | /* |
2916 | * The label sent is usually on the label list. | |
2917 | * | |
2918 | * If it is not we may still want to allow the | |
2919 | * delivery. | |
2920 | * | |
2921 | * If the recipient is accepting all packets | |
2922 | * because it is using the star ("*") label | |
2923 | * for SMACK64IPIN provide the web ("@") label | |
2924 | * so that a directed response will succeed. | |
2925 | * This is not very correct from a MAC point | |
2926 | * of view, but gets around the problem that | |
2927 | * locking prevents adding the newly discovered | |
2928 | * label to the list. | |
2929 | * The case where the recipient is not using | |
2930 | * the star label should obviously fail. | |
2931 | * The easy way to do this is to provide the | |
2932 | * star label as the subject label. | |
2933 | */ | |
2934 | skp = smk_find_entry(smack); | |
2935 | if (skp != NULL) | |
2936 | return skp->smk_known; | |
2937 | if (ssp != NULL && | |
2938 | ssp->smk_in == smack_known_star.smk_known) | |
2939 | return smack_known_web.smk_known; | |
2940 | return smack_known_star.smk_known; | |
6d3dc07c CS |
2941 | } |
2942 | /* | |
2943 | * Look it up in the supplied table if it is not | |
2944 | * a direct mapping. | |
2945 | */ | |
272cd7a8 CS |
2946 | sp = smack_from_cipso(sap->attr.mls.lvl, smack); |
2947 | if (sp != NULL) | |
2948 | return sp; | |
2949 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) | |
2950 | return smack_known_web.smk_known; | |
2951 | return smack_known_star.smk_known; | |
e114e473 | 2952 | } |
6d3dc07c CS |
2953 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2954 | /* | |
2955 | * Looks like a fallback, which gives us a secid. | |
2956 | */ | |
2957 | sp = smack_from_secid(sap->attr.secid); | |
2958 | /* | |
2959 | * This has got to be a bug because it is | |
2960 | * impossible to specify a fallback without | |
2961 | * specifying the label, which will ensure | |
2962 | * it has a secid, and the only way to get a | |
2963 | * secid is from a fallback. | |
2964 | */ | |
2965 | BUG_ON(sp == NULL); | |
272cd7a8 | 2966 | return sp; |
e114e473 CS |
2967 | } |
2968 | /* | |
6d3dc07c CS |
2969 | * Without guidance regarding the smack value |
2970 | * for the packet fall back on the network | |
2971 | * ambient value. | |
e114e473 | 2972 | */ |
272cd7a8 | 2973 | return smack_net_ambient; |
e114e473 CS |
2974 | } |
2975 | ||
2976 | /** | |
2977 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2978 | * @sk: socket | |
2979 | * @skb: packet | |
2980 | * | |
2981 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2982 | */ | |
2983 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2984 | { | |
2985 | struct netlbl_lsm_secattr secattr; | |
2986 | struct socket_smack *ssp = sk->sk_security; | |
6d3dc07c | 2987 | char *csp; |
e114e473 | 2988 | int rc; |
ecfcc53f | 2989 | struct smk_audit_info ad; |
e114e473 CS |
2990 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2991 | return 0; | |
2992 | ||
2993 | /* | |
2994 | * Translate what netlabel gave us. | |
2995 | */ | |
e114e473 | 2996 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2997 | |
e114e473 | 2998 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
272cd7a8 CS |
2999 | if (rc == 0) |
3000 | csp = smack_from_secattr(&secattr, ssp); | |
3001 | else | |
6d3dc07c CS |
3002 | csp = smack_net_ambient; |
3003 | ||
e114e473 | 3004 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3005 | |
ecfcc53f EB |
3006 | #ifdef CONFIG_AUDIT |
3007 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3008 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 3009 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3010 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3011 | #endif | |
e114e473 CS |
3012 | /* |
3013 | * Receiving a packet requires that the other end | |
3014 | * be able to write here. Read access is not required. | |
3015 | * This is the simplist possible security model | |
3016 | * for networking. | |
3017 | */ | |
ecfcc53f | 3018 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
3019 | if (rc != 0) |
3020 | netlbl_skbuff_err(skb, rc, 0); | |
3021 | return rc; | |
e114e473 CS |
3022 | } |
3023 | ||
3024 | /** | |
3025 | * smack_socket_getpeersec_stream - pull in packet label | |
3026 | * @sock: the socket | |
3027 | * @optval: user's destination | |
3028 | * @optlen: size thereof | |
251a2a95 | 3029 | * @len: max thereof |
e114e473 CS |
3030 | * |
3031 | * returns zero on success, an error code otherwise | |
3032 | */ | |
3033 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3034 | char __user *optval, | |
3035 | int __user *optlen, unsigned len) | |
3036 | { | |
3037 | struct socket_smack *ssp; | |
272cd7a8 CS |
3038 | char *rcp = ""; |
3039 | int slen = 1; | |
e114e473 CS |
3040 | int rc = 0; |
3041 | ||
3042 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3043 | if (ssp->smk_packet != NULL) { |
3044 | rcp = ssp->smk_packet; | |
3045 | slen = strlen(rcp) + 1; | |
3046 | } | |
e114e473 CS |
3047 | |
3048 | if (slen > len) | |
3049 | rc = -ERANGE; | |
272cd7a8 | 3050 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3051 | rc = -EFAULT; |
3052 | ||
3053 | if (put_user(slen, optlen) != 0) | |
3054 | rc = -EFAULT; | |
3055 | ||
3056 | return rc; | |
3057 | } | |
3058 | ||
3059 | ||
3060 | /** | |
3061 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3062 | * @sock: the peer socket |
e114e473 CS |
3063 | * @skb: packet data |
3064 | * @secid: pointer to where to put the secid of the packet | |
3065 | * | |
3066 | * Sets the netlabel socket state on sk from parent | |
3067 | */ | |
3068 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3069 | struct sk_buff *skb, u32 *secid) | |
3070 | ||
3071 | { | |
3072 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 CS |
3073 | struct socket_smack *ssp = NULL; |
3074 | char *sp; | |
b4e0d5f0 CS |
3075 | int family = PF_UNSPEC; |
3076 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3077 | int rc; |
3078 | ||
b4e0d5f0 CS |
3079 | if (skb != NULL) { |
3080 | if (skb->protocol == htons(ETH_P_IP)) | |
3081 | family = PF_INET; | |
3082 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3083 | family = PF_INET6; | |
e114e473 | 3084 | } |
b4e0d5f0 CS |
3085 | if (family == PF_UNSPEC && sock != NULL) |
3086 | family = sock->sk->sk_family; | |
e114e473 | 3087 | |
b4e0d5f0 | 3088 | if (family == PF_UNIX) { |
272cd7a8 CS |
3089 | ssp = sock->sk->sk_security; |
3090 | s = smack_to_secid(ssp->smk_out); | |
b4e0d5f0 CS |
3091 | } else if (family == PF_INET || family == PF_INET6) { |
3092 | /* | |
3093 | * Translate what netlabel gave us. | |
3094 | */ | |
272cd7a8 CS |
3095 | if (sock != NULL && sock->sk != NULL) |
3096 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3097 | netlbl_secattr_init(&secattr); |
3098 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3099 | if (rc == 0) { | |
272cd7a8 CS |
3100 | sp = smack_from_secattr(&secattr, ssp); |
3101 | s = smack_to_secid(sp); | |
b4e0d5f0 CS |
3102 | } |
3103 | netlbl_secattr_destroy(&secattr); | |
3104 | } | |
3105 | *secid = s; | |
e114e473 CS |
3106 | if (s == 0) |
3107 | return -EINVAL; | |
e114e473 CS |
3108 | return 0; |
3109 | } | |
3110 | ||
3111 | /** | |
07feee8f PM |
3112 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3113 | * @sk: child sock | |
3114 | * @parent: parent socket | |
e114e473 | 3115 | * |
07feee8f PM |
3116 | * Set the smk_{in,out} state of an existing sock based on the process that |
3117 | * is creating the new socket. | |
e114e473 CS |
3118 | */ |
3119 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3120 | { | |
3121 | struct socket_smack *ssp; | |
e114e473 | 3122 | |
07feee8f PM |
3123 | if (sk == NULL || |
3124 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3125 | return; |
3126 | ||
3127 | ssp = sk->sk_security; | |
676dac4b | 3128 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3129 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3130 | } |
3131 | ||
3132 | /** | |
3133 | * smack_inet_conn_request - Smack access check on connect | |
3134 | * @sk: socket involved | |
3135 | * @skb: packet | |
3136 | * @req: unused | |
3137 | * | |
3138 | * Returns 0 if a task with the packet label could write to | |
3139 | * the socket, otherwise an error code | |
3140 | */ | |
3141 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3142 | struct request_sock *req) | |
3143 | { | |
07feee8f | 3144 | u16 family = sk->sk_family; |
e114e473 | 3145 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3146 | struct netlbl_lsm_secattr secattr; |
3147 | struct sockaddr_in addr; | |
3148 | struct iphdr *hdr; | |
272cd7a8 | 3149 | char *sp; |
e114e473 | 3150 | int rc; |
ecfcc53f | 3151 | struct smk_audit_info ad; |
e114e473 | 3152 | |
07feee8f PM |
3153 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3154 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3155 | family = PF_INET; | |
e114e473 | 3156 | |
07feee8f PM |
3157 | netlbl_secattr_init(&secattr); |
3158 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3159 | if (rc == 0) |
272cd7a8 | 3160 | sp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3161 | else |
272cd7a8 | 3162 | sp = smack_known_huh.smk_known; |
07feee8f PM |
3163 | netlbl_secattr_destroy(&secattr); |
3164 | ||
ecfcc53f EB |
3165 | #ifdef CONFIG_AUDIT |
3166 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3167 | ad.a.u.net.family = family; | |
8964be4a | 3168 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3169 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3170 | #endif | |
e114e473 | 3171 | /* |
07feee8f PM |
3172 | * Receiving a packet requires that the other end be able to write |
3173 | * here. Read access is not required. | |
e114e473 | 3174 | */ |
272cd7a8 | 3175 | rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3176 | if (rc != 0) |
3177 | return rc; | |
3178 | ||
3179 | /* | |
3180 | * Save the peer's label in the request_sock so we can later setup | |
3181 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3182 | */ | |
272cd7a8 | 3183 | req->peer_secid = smack_to_secid(sp); |
07feee8f PM |
3184 | |
3185 | /* | |
3186 | * We need to decide if we want to label the incoming connection here | |
3187 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3188 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3189 | */ |
3190 | hdr = ip_hdr(skb); | |
3191 | addr.sin_addr.s_addr = hdr->saddr; | |
3192 | rcu_read_lock(); | |
3193 | if (smack_host_label(&addr) == NULL) { | |
3194 | rcu_read_unlock(); | |
3195 | netlbl_secattr_init(&secattr); | |
272cd7a8 | 3196 | smack_to_secattr(sp, &secattr); |
07feee8f PM |
3197 | rc = netlbl_req_setattr(req, &secattr); |
3198 | netlbl_secattr_destroy(&secattr); | |
3199 | } else { | |
3200 | rcu_read_unlock(); | |
3201 | netlbl_req_delattr(req); | |
3202 | } | |
e114e473 CS |
3203 | |
3204 | return rc; | |
3205 | } | |
3206 | ||
07feee8f PM |
3207 | /** |
3208 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3209 | * @sk: the new socket | |
3210 | * @req: the connection's request_sock | |
3211 | * | |
3212 | * Transfer the connection's peer label to the newly created socket. | |
3213 | */ | |
3214 | static void smack_inet_csk_clone(struct sock *sk, | |
3215 | const struct request_sock *req) | |
3216 | { | |
3217 | struct socket_smack *ssp = sk->sk_security; | |
07feee8f | 3218 | |
272cd7a8 CS |
3219 | if (req->peer_secid != 0) |
3220 | ssp->smk_packet = smack_from_secid(req->peer_secid); | |
3221 | else | |
3222 | ssp->smk_packet = NULL; | |
07feee8f PM |
3223 | } |
3224 | ||
e114e473 CS |
3225 | /* |
3226 | * Key management security hooks | |
3227 | * | |
3228 | * Casey has not tested key support very heavily. | |
3229 | * The permission check is most likely too restrictive. | |
3230 | * If you care about keys please have a look. | |
3231 | */ | |
3232 | #ifdef CONFIG_KEYS | |
3233 | ||
3234 | /** | |
3235 | * smack_key_alloc - Set the key security blob | |
3236 | * @key: object | |
d84f4f99 | 3237 | * @cred: the credentials to use |
e114e473 CS |
3238 | * @flags: unused |
3239 | * | |
3240 | * No allocation required | |
3241 | * | |
3242 | * Returns 0 | |
3243 | */ | |
d84f4f99 | 3244 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3245 | unsigned long flags) |
3246 | { | |
676dac4b | 3247 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3248 | return 0; |
3249 | } | |
3250 | ||
3251 | /** | |
3252 | * smack_key_free - Clear the key security blob | |
3253 | * @key: the object | |
3254 | * | |
3255 | * Clear the blob pointer | |
3256 | */ | |
3257 | static void smack_key_free(struct key *key) | |
3258 | { | |
3259 | key->security = NULL; | |
3260 | } | |
3261 | ||
3262 | /* | |
3263 | * smack_key_permission - Smack access on a key | |
3264 | * @key_ref: gets to the object | |
d84f4f99 | 3265 | * @cred: the credentials to use |
e114e473 CS |
3266 | * @perm: unused |
3267 | * | |
3268 | * Return 0 if the task has read and write to the object, | |
3269 | * an error code otherwise | |
3270 | */ | |
3271 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3272 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3273 | { |
3274 | struct key *keyp; | |
ecfcc53f | 3275 | struct smk_audit_info ad; |
676dac4b | 3276 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3277 | |
3278 | keyp = key_ref_to_ptr(key_ref); | |
3279 | if (keyp == NULL) | |
3280 | return -EINVAL; | |
3281 | /* | |
3282 | * If the key hasn't been initialized give it access so that | |
3283 | * it may do so. | |
3284 | */ | |
3285 | if (keyp->security == NULL) | |
3286 | return 0; | |
3287 | /* | |
3288 | * This should not occur | |
3289 | */ | |
676dac4b | 3290 | if (tsp == NULL) |
e114e473 | 3291 | return -EACCES; |
ecfcc53f EB |
3292 | #ifdef CONFIG_AUDIT |
3293 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3294 | ad.a.u.key_struct.key = keyp->serial; | |
3295 | ad.a.u.key_struct.key_desc = keyp->description; | |
3296 | #endif | |
676dac4b | 3297 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3298 | MAY_READWRITE, &ad); |
e114e473 CS |
3299 | } |
3300 | #endif /* CONFIG_KEYS */ | |
3301 | ||
d20bdda6 AD |
3302 | /* |
3303 | * Smack Audit hooks | |
3304 | * | |
3305 | * Audit requires a unique representation of each Smack specific | |
3306 | * rule. This unique representation is used to distinguish the | |
3307 | * object to be audited from remaining kernel objects and also | |
3308 | * works as a glue between the audit hooks. | |
3309 | * | |
3310 | * Since repository entries are added but never deleted, we'll use | |
3311 | * the smack_known label address related to the given audit rule as | |
3312 | * the needed unique representation. This also better fits the smack | |
3313 | * model where nearly everything is a label. | |
3314 | */ | |
3315 | #ifdef CONFIG_AUDIT | |
3316 | ||
3317 | /** | |
3318 | * smack_audit_rule_init - Initialize a smack audit rule | |
3319 | * @field: audit rule fields given from user-space (audit.h) | |
3320 | * @op: required testing operator (=, !=, >, <, ...) | |
3321 | * @rulestr: smack label to be audited | |
3322 | * @vrule: pointer to save our own audit rule representation | |
3323 | * | |
3324 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3325 | * The label to be audited is created if necessay. | |
3326 | */ | |
3327 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3328 | { | |
3329 | char **rule = (char **)vrule; | |
3330 | *rule = NULL; | |
3331 | ||
3332 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3333 | return -EINVAL; | |
3334 | ||
5af75d8d | 3335 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3336 | return -EINVAL; |
3337 | ||
3338 | *rule = smk_import(rulestr, 0); | |
3339 | ||
3340 | return 0; | |
3341 | } | |
3342 | ||
3343 | /** | |
3344 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3345 | * @krule: rule of interest, in Audit kernel representation format | |
3346 | * | |
3347 | * This is used to filter Smack rules from remaining Audit ones. | |
3348 | * If it's proved that this rule belongs to us, the | |
3349 | * audit_rule_match hook will be called to do the final judgement. | |
3350 | */ | |
3351 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3352 | { | |
3353 | struct audit_field *f; | |
3354 | int i; | |
3355 | ||
3356 | for (i = 0; i < krule->field_count; i++) { | |
3357 | f = &krule->fields[i]; | |
3358 | ||
3359 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3360 | return 1; | |
3361 | } | |
3362 | ||
3363 | return 0; | |
3364 | } | |
3365 | ||
3366 | /** | |
3367 | * smack_audit_rule_match - Audit given object ? | |
3368 | * @secid: security id for identifying the object to test | |
3369 | * @field: audit rule flags given from user-space | |
3370 | * @op: required testing operator | |
3371 | * @vrule: smack internal rule presentation | |
3372 | * @actx: audit context associated with the check | |
3373 | * | |
3374 | * The core Audit hook. It's used to take the decision of | |
3375 | * whether to audit or not to audit a given object. | |
3376 | */ | |
3377 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3378 | struct audit_context *actx) | |
3379 | { | |
3380 | char *smack; | |
3381 | char *rule = vrule; | |
3382 | ||
3383 | if (!rule) { | |
3384 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
3385 | "Smack: missing rule\n"); | |
3386 | return -ENOENT; | |
3387 | } | |
3388 | ||
3389 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3390 | return 0; | |
3391 | ||
3392 | smack = smack_from_secid(secid); | |
3393 | ||
3394 | /* | |
3395 | * No need to do string comparisons. If a match occurs, | |
3396 | * both pointers will point to the same smack_known | |
3397 | * label. | |
3398 | */ | |
5af75d8d | 3399 | if (op == Audit_equal) |
d20bdda6 | 3400 | return (rule == smack); |
5af75d8d | 3401 | if (op == Audit_not_equal) |
d20bdda6 AD |
3402 | return (rule != smack); |
3403 | ||
3404 | return 0; | |
3405 | } | |
3406 | ||
3407 | /** | |
3408 | * smack_audit_rule_free - free smack rule representation | |
3409 | * @vrule: rule to be freed. | |
3410 | * | |
3411 | * No memory was allocated. | |
3412 | */ | |
3413 | static void smack_audit_rule_free(void *vrule) | |
3414 | { | |
3415 | /* No-op */ | |
3416 | } | |
3417 | ||
3418 | #endif /* CONFIG_AUDIT */ | |
3419 | ||
251a2a95 | 3420 | /** |
e114e473 CS |
3421 | * smack_secid_to_secctx - return the smack label for a secid |
3422 | * @secid: incoming integer | |
3423 | * @secdata: destination | |
3424 | * @seclen: how long it is | |
3425 | * | |
3426 | * Exists for networking code. | |
3427 | */ | |
3428 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3429 | { | |
3430 | char *sp = smack_from_secid(secid); | |
3431 | ||
d5630b9d EP |
3432 | if (secdata) |
3433 | *secdata = sp; | |
e114e473 CS |
3434 | *seclen = strlen(sp); |
3435 | return 0; | |
3436 | } | |
3437 | ||
251a2a95 | 3438 | /** |
4bc87e62 CS |
3439 | * smack_secctx_to_secid - return the secid for a smack label |
3440 | * @secdata: smack label | |
3441 | * @seclen: how long result is | |
3442 | * @secid: outgoing integer | |
3443 | * | |
3444 | * Exists for audit and networking code. | |
3445 | */ | |
e52c1764 | 3446 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3447 | { |
3448 | *secid = smack_to_secid(secdata); | |
3449 | return 0; | |
3450 | } | |
3451 | ||
251a2a95 | 3452 | /** |
e114e473 | 3453 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3454 | * @secdata: unused |
3455 | * @seclen: unused | |
e114e473 CS |
3456 | * |
3457 | * Exists to make sure nothing gets done, and properly | |
3458 | */ | |
3459 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3460 | { | |
3461 | } | |
3462 | ||
1ee65e37 DQ |
3463 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3464 | { | |
3465 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3466 | } | |
3467 | ||
3468 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3469 | { | |
3470 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3471 | } | |
3472 | ||
3473 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3474 | { | |
3475 | int len = 0; | |
3476 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3477 | ||
3478 | if (len < 0) | |
3479 | return len; | |
3480 | *ctxlen = len; | |
3481 | return 0; | |
3482 | } | |
3483 | ||
076c54c5 AD |
3484 | struct security_operations smack_ops = { |
3485 | .name = "smack", | |
3486 | ||
9e48858f | 3487 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3488 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3489 | .syslog = smack_syslog, |
e114e473 CS |
3490 | |
3491 | .sb_alloc_security = smack_sb_alloc_security, | |
3492 | .sb_free_security = smack_sb_free_security, | |
3493 | .sb_copy_data = smack_sb_copy_data, | |
3494 | .sb_kern_mount = smack_sb_kern_mount, | |
3495 | .sb_statfs = smack_sb_statfs, | |
3496 | .sb_mount = smack_sb_mount, | |
3497 | .sb_umount = smack_sb_umount, | |
3498 | ||
676dac4b | 3499 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3500 | .bprm_committing_creds = smack_bprm_committing_creds, |
3501 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3502 | |
e114e473 CS |
3503 | .inode_alloc_security = smack_inode_alloc_security, |
3504 | .inode_free_security = smack_inode_free_security, | |
3505 | .inode_init_security = smack_inode_init_security, | |
3506 | .inode_link = smack_inode_link, | |
3507 | .inode_unlink = smack_inode_unlink, | |
3508 | .inode_rmdir = smack_inode_rmdir, | |
3509 | .inode_rename = smack_inode_rename, | |
3510 | .inode_permission = smack_inode_permission, | |
3511 | .inode_setattr = smack_inode_setattr, | |
3512 | .inode_getattr = smack_inode_getattr, | |
3513 | .inode_setxattr = smack_inode_setxattr, | |
3514 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3515 | .inode_getxattr = smack_inode_getxattr, | |
3516 | .inode_removexattr = smack_inode_removexattr, | |
3517 | .inode_getsecurity = smack_inode_getsecurity, | |
3518 | .inode_setsecurity = smack_inode_setsecurity, | |
3519 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3520 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3521 | |
3522 | .file_permission = smack_file_permission, | |
3523 | .file_alloc_security = smack_file_alloc_security, | |
3524 | .file_free_security = smack_file_free_security, | |
3525 | .file_ioctl = smack_file_ioctl, | |
3526 | .file_lock = smack_file_lock, | |
3527 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3528 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3529 | .file_set_fowner = smack_file_set_fowner, |
3530 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3531 | .file_receive = smack_file_receive, | |
3532 | ||
531f1d45 CS |
3533 | .dentry_open = smack_dentry_open, |
3534 | ||
ee18d64c | 3535 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3536 | .cred_free = smack_cred_free, |
d84f4f99 | 3537 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3538 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3539 | .kernel_act_as = smack_kernel_act_as, |
3540 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3541 | .task_setpgid = smack_task_setpgid, |
3542 | .task_getpgid = smack_task_getpgid, | |
3543 | .task_getsid = smack_task_getsid, | |
3544 | .task_getsecid = smack_task_getsecid, | |
3545 | .task_setnice = smack_task_setnice, | |
3546 | .task_setioprio = smack_task_setioprio, | |
3547 | .task_getioprio = smack_task_getioprio, | |
3548 | .task_setscheduler = smack_task_setscheduler, | |
3549 | .task_getscheduler = smack_task_getscheduler, | |
3550 | .task_movememory = smack_task_movememory, | |
3551 | .task_kill = smack_task_kill, | |
3552 | .task_wait = smack_task_wait, | |
e114e473 CS |
3553 | .task_to_inode = smack_task_to_inode, |
3554 | ||
3555 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3556 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3557 | |
3558 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3559 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3560 | ||
3561 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3562 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3563 | .msg_queue_associate = smack_msg_queue_associate, | |
3564 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3565 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3566 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3567 | ||
3568 | .shm_alloc_security = smack_shm_alloc_security, | |
3569 | .shm_free_security = smack_shm_free_security, | |
3570 | .shm_associate = smack_shm_associate, | |
3571 | .shm_shmctl = smack_shm_shmctl, | |
3572 | .shm_shmat = smack_shm_shmat, | |
3573 | ||
3574 | .sem_alloc_security = smack_sem_alloc_security, | |
3575 | .sem_free_security = smack_sem_free_security, | |
3576 | .sem_associate = smack_sem_associate, | |
3577 | .sem_semctl = smack_sem_semctl, | |
3578 | .sem_semop = smack_sem_semop, | |
3579 | ||
e114e473 CS |
3580 | .d_instantiate = smack_d_instantiate, |
3581 | ||
3582 | .getprocattr = smack_getprocattr, | |
3583 | .setprocattr = smack_setprocattr, | |
3584 | ||
3585 | .unix_stream_connect = smack_unix_stream_connect, | |
3586 | .unix_may_send = smack_unix_may_send, | |
3587 | ||
3588 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3589 | .socket_connect = smack_socket_connect, |
3590 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3591 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3592 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3593 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3594 | .sk_alloc_security = smack_sk_alloc_security, | |
3595 | .sk_free_security = smack_sk_free_security, | |
3596 | .sock_graft = smack_sock_graft, | |
3597 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3598 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3599 | |
e114e473 CS |
3600 | /* key management security hooks */ |
3601 | #ifdef CONFIG_KEYS | |
3602 | .key_alloc = smack_key_alloc, | |
3603 | .key_free = smack_key_free, | |
3604 | .key_permission = smack_key_permission, | |
3605 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3606 | |
3607 | /* Audit hooks */ | |
3608 | #ifdef CONFIG_AUDIT | |
3609 | .audit_rule_init = smack_audit_rule_init, | |
3610 | .audit_rule_known = smack_audit_rule_known, | |
3611 | .audit_rule_match = smack_audit_rule_match, | |
3612 | .audit_rule_free = smack_audit_rule_free, | |
3613 | #endif /* CONFIG_AUDIT */ | |
3614 | ||
e114e473 | 3615 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3616 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3617 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3618 | .inode_notifysecctx = smack_inode_notifysecctx, |
3619 | .inode_setsecctx = smack_inode_setsecctx, | |
3620 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3621 | }; |
3622 | ||
7198e2ee EB |
3623 | |
3624 | static __init void init_smack_know_list(void) | |
3625 | { | |
3626 | list_add(&smack_known_huh.list, &smack_known_list); | |
3627 | list_add(&smack_known_hat.list, &smack_known_list); | |
3628 | list_add(&smack_known_star.list, &smack_known_list); | |
3629 | list_add(&smack_known_floor.list, &smack_known_list); | |
3630 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3631 | list_add(&smack_known_web.list, &smack_known_list); | |
3632 | } | |
3633 | ||
e114e473 CS |
3634 | /** |
3635 | * smack_init - initialize the smack system | |
3636 | * | |
3637 | * Returns 0 | |
3638 | */ | |
3639 | static __init int smack_init(void) | |
3640 | { | |
d84f4f99 | 3641 | struct cred *cred; |
676dac4b | 3642 | struct task_smack *tsp; |
d84f4f99 | 3643 | |
7898e1f8 CS |
3644 | if (!security_module_enable(&smack_ops)) |
3645 | return 0; | |
3646 | ||
3647 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3648 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3649 | if (tsp == NULL) |
3650 | return -ENOMEM; | |
3651 | ||
e114e473 CS |
3652 | printk(KERN_INFO "Smack: Initializing.\n"); |
3653 | ||
3654 | /* | |
3655 | * Set the security state for the initial task. | |
3656 | */ | |
d84f4f99 | 3657 | cred = (struct cred *) current->cred; |
676dac4b | 3658 | cred->security = tsp; |
e114e473 | 3659 | |
421f91d2 | 3660 | /* initialize the smack_know_list */ |
7198e2ee | 3661 | init_smack_know_list(); |
e114e473 CS |
3662 | /* |
3663 | * Initialize locks | |
3664 | */ | |
e114e473 CS |
3665 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3666 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3667 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3668 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3669 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3670 | ||
3671 | /* | |
3672 | * Register with LSM | |
3673 | */ | |
3674 | if (register_security(&smack_ops)) | |
3675 | panic("smack: Unable to register with kernel.\n"); | |
3676 | ||
3677 | return 0; | |
3678 | } | |
3679 | ||
3680 | /* | |
3681 | * Smack requires early initialization in order to label | |
3682 | * all processes and objects when they are created. | |
3683 | */ | |
3684 | security_initcall(smack_init); |