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 | * | |
6 | * Author: | |
7 | * Casey Schaufler <casey@schaufler-ca.com> | |
8 | * | |
9 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f PM |
10 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
11 | * Paul Moore <paul.moore@hp.com> | |
e114e473 CS |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2, | |
15 | * as published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/xattr.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/stat.h> | |
22 | #include <linux/ext2_fs.h> | |
23 | #include <linux/kd.h> | |
24 | #include <asm/ioctls.h> | |
07feee8f | 25 | #include <linux/ip.h> |
e114e473 CS |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
e114e473 CS |
29 | #include <linux/mutex.h> |
30 | #include <linux/pipe_fs_i.h> | |
31 | #include <net/netlabel.h> | |
32 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 33 | #include <linux/audit.h> |
1fd7317d | 34 | #include <linux/magic.h> |
e114e473 CS |
35 | #include "smack.h" |
36 | ||
c69e8d9c DH |
37 | #define task_security(task) (task_cred_xxx((task), security)) |
38 | ||
e114e473 CS |
39 | /** |
40 | * smk_fetch - Fetch the smack label from a file. | |
41 | * @ip: a pointer to the inode | |
42 | * @dp: a pointer to the dentry | |
43 | * | |
44 | * Returns a pointer to the master list entry for the Smack label | |
45 | * or NULL if there was no label to fetch. | |
46 | */ | |
47 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
48 | { | |
49 | int rc; | |
50 | char in[SMK_LABELLEN]; | |
51 | ||
52 | if (ip->i_op->getxattr == NULL) | |
53 | return NULL; | |
54 | ||
55 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
56 | if (rc < 0) | |
57 | return NULL; | |
58 | ||
59 | return smk_import(in, rc); | |
60 | } | |
61 | ||
62 | /** | |
63 | * new_inode_smack - allocate an inode security blob | |
64 | * @smack: a pointer to the Smack label to use in the blob | |
65 | * | |
66 | * Returns the new blob or NULL if there's no memory available | |
67 | */ | |
68 | struct inode_smack *new_inode_smack(char *smack) | |
69 | { | |
70 | struct inode_smack *isp; | |
71 | ||
72 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
73 | if (isp == NULL) | |
74 | return NULL; | |
75 | ||
76 | isp->smk_inode = smack; | |
77 | isp->smk_flags = 0; | |
78 | mutex_init(&isp->smk_lock); | |
79 | ||
80 | return isp; | |
81 | } | |
82 | ||
83 | /* | |
84 | * LSM hooks. | |
85 | * We he, that is fun! | |
86 | */ | |
87 | ||
88 | /** | |
9e48858f | 89 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 90 | * @ctp: child task pointer |
251a2a95 | 91 | * @mode: ptrace attachment mode |
e114e473 CS |
92 | * |
93 | * Returns 0 if access is OK, an error code otherwise | |
94 | * | |
95 | * Do the capability checks, and require read and write. | |
96 | */ | |
9e48858f | 97 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
98 | { |
99 | int rc; | |
ecfcc53f EB |
100 | struct smk_audit_info ad; |
101 | char *sp, *tsp; | |
e114e473 | 102 | |
9e48858f | 103 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
104 | if (rc != 0) |
105 | return rc; | |
106 | ||
ecfcc53f EB |
107 | sp = current_security(); |
108 | tsp = task_security(ctp); | |
109 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
110 | smk_ad_setfield_u_tsk(&ad, ctp); | |
111 | ||
112 | /* we won't log here, because rc can be overriden */ | |
113 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); | |
5cd9c58f | 114 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
115 | rc = 0; |
116 | ||
117 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); | |
5cd9c58f DH |
118 | return rc; |
119 | } | |
120 | ||
121 | /** | |
122 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
123 | * @ptp: parent task pointer | |
124 | * | |
125 | * Returns 0 if access is OK, an error code otherwise | |
126 | * | |
127 | * Do the capability checks, and require read and write. | |
128 | */ | |
129 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
130 | { | |
131 | int rc; | |
ecfcc53f EB |
132 | struct smk_audit_info ad; |
133 | char *sp, *tsp; | |
5cd9c58f DH |
134 | |
135 | rc = cap_ptrace_traceme(ptp); | |
136 | if (rc != 0) | |
137 | return rc; | |
e114e473 | 138 | |
ecfcc53f EB |
139 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
140 | smk_ad_setfield_u_tsk(&ad, ptp); | |
141 | ||
142 | sp = current_security(); | |
143 | tsp = task_security(ptp); | |
144 | /* we won't log here, because rc can be overriden */ | |
145 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); | |
5cd9c58f | 146 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
147 | rc = 0; |
148 | ||
149 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); | |
e114e473 CS |
150 | return rc; |
151 | } | |
152 | ||
153 | /** | |
154 | * smack_syslog - Smack approval on syslog | |
155 | * @type: message type | |
156 | * | |
157 | * Require that the task has the floor label | |
158 | * | |
159 | * Returns 0 on success, error code otherwise. | |
160 | */ | |
00234592 | 161 | static int smack_syslog(int type, bool from_file) |
e114e473 CS |
162 | { |
163 | int rc; | |
86a264ab | 164 | char *sp = current_security(); |
e114e473 | 165 | |
00234592 | 166 | rc = cap_syslog(type, from_file); |
e114e473 CS |
167 | if (rc != 0) |
168 | return rc; | |
169 | ||
170 | if (capable(CAP_MAC_OVERRIDE)) | |
171 | return 0; | |
172 | ||
173 | if (sp != smack_known_floor.smk_known) | |
174 | rc = -EACCES; | |
175 | ||
176 | return rc; | |
177 | } | |
178 | ||
179 | ||
180 | /* | |
181 | * Superblock Hooks. | |
182 | */ | |
183 | ||
184 | /** | |
185 | * smack_sb_alloc_security - allocate a superblock blob | |
186 | * @sb: the superblock getting the blob | |
187 | * | |
188 | * Returns 0 on success or -ENOMEM on error. | |
189 | */ | |
190 | static int smack_sb_alloc_security(struct super_block *sb) | |
191 | { | |
192 | struct superblock_smack *sbsp; | |
193 | ||
194 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
195 | ||
196 | if (sbsp == NULL) | |
197 | return -ENOMEM; | |
198 | ||
199 | sbsp->smk_root = smack_known_floor.smk_known; | |
200 | sbsp->smk_default = smack_known_floor.smk_known; | |
201 | sbsp->smk_floor = smack_known_floor.smk_known; | |
202 | sbsp->smk_hat = smack_known_hat.smk_known; | |
203 | sbsp->smk_initialized = 0; | |
204 | spin_lock_init(&sbsp->smk_sblock); | |
205 | ||
206 | sb->s_security = sbsp; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /** | |
212 | * smack_sb_free_security - free a superblock blob | |
213 | * @sb: the superblock getting the blob | |
214 | * | |
215 | */ | |
216 | static void smack_sb_free_security(struct super_block *sb) | |
217 | { | |
218 | kfree(sb->s_security); | |
219 | sb->s_security = NULL; | |
220 | } | |
221 | ||
222 | /** | |
223 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 224 | * @orig: where to start |
251a2a95 | 225 | * @smackopts: mount options string |
e114e473 CS |
226 | * |
227 | * Returns 0 on success or -ENOMEM on error. | |
228 | * | |
229 | * Copy the Smack specific mount options out of the mount | |
230 | * options list. | |
231 | */ | |
e0007529 | 232 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
233 | { |
234 | char *cp, *commap, *otheropts, *dp; | |
235 | ||
e114e473 CS |
236 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
237 | if (otheropts == NULL) | |
238 | return -ENOMEM; | |
239 | ||
240 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
241 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
242 | dp = smackopts; | |
243 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
244 | dp = smackopts; | |
245 | else if (strstr(cp, SMK_FSHAT) == cp) | |
246 | dp = smackopts; | |
247 | else if (strstr(cp, SMK_FSROOT) == cp) | |
248 | dp = smackopts; | |
249 | else | |
250 | dp = otheropts; | |
251 | ||
252 | commap = strchr(cp, ','); | |
253 | if (commap != NULL) | |
254 | *commap = '\0'; | |
255 | ||
256 | if (*dp != '\0') | |
257 | strcat(dp, ","); | |
258 | strcat(dp, cp); | |
259 | } | |
260 | ||
261 | strcpy(orig, otheropts); | |
262 | free_page((unsigned long)otheropts); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | /** | |
268 | * smack_sb_kern_mount - Smack specific mount processing | |
269 | * @sb: the file system superblock | |
12204e24 | 270 | * @flags: the mount flags |
e114e473 CS |
271 | * @data: the smack mount options |
272 | * | |
273 | * Returns 0 on success, an error code on failure | |
274 | */ | |
12204e24 | 275 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
276 | { |
277 | struct dentry *root = sb->s_root; | |
278 | struct inode *inode = root->d_inode; | |
279 | struct superblock_smack *sp = sb->s_security; | |
280 | struct inode_smack *isp; | |
281 | char *op; | |
282 | char *commap; | |
283 | char *nsp; | |
284 | ||
285 | spin_lock(&sp->smk_sblock); | |
286 | if (sp->smk_initialized != 0) { | |
287 | spin_unlock(&sp->smk_sblock); | |
288 | return 0; | |
289 | } | |
290 | sp->smk_initialized = 1; | |
291 | spin_unlock(&sp->smk_sblock); | |
292 | ||
293 | for (op = data; op != NULL; op = commap) { | |
294 | commap = strchr(op, ','); | |
295 | if (commap != NULL) | |
296 | *commap++ = '\0'; | |
297 | ||
298 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
299 | op += strlen(SMK_FSHAT); | |
300 | nsp = smk_import(op, 0); | |
301 | if (nsp != NULL) | |
302 | sp->smk_hat = nsp; | |
303 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
304 | op += strlen(SMK_FSFLOOR); | |
305 | nsp = smk_import(op, 0); | |
306 | if (nsp != NULL) | |
307 | sp->smk_floor = nsp; | |
308 | } else if (strncmp(op, SMK_FSDEFAULT, | |
309 | strlen(SMK_FSDEFAULT)) == 0) { | |
310 | op += strlen(SMK_FSDEFAULT); | |
311 | nsp = smk_import(op, 0); | |
312 | if (nsp != NULL) | |
313 | sp->smk_default = nsp; | |
314 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
315 | op += strlen(SMK_FSROOT); | |
316 | nsp = smk_import(op, 0); | |
317 | if (nsp != NULL) | |
318 | sp->smk_root = nsp; | |
319 | } | |
320 | } | |
321 | ||
322 | /* | |
323 | * Initialize the root inode. | |
324 | */ | |
325 | isp = inode->i_security; | |
326 | if (isp == NULL) | |
327 | inode->i_security = new_inode_smack(sp->smk_root); | |
328 | else | |
329 | isp->smk_inode = sp->smk_root; | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /** | |
335 | * smack_sb_statfs - Smack check on statfs | |
336 | * @dentry: identifies the file system in question | |
337 | * | |
338 | * Returns 0 if current can read the floor of the filesystem, | |
339 | * and error code otherwise | |
340 | */ | |
341 | static int smack_sb_statfs(struct dentry *dentry) | |
342 | { | |
343 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
344 | int rc; |
345 | struct smk_audit_info ad; | |
346 | ||
347 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
348 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 349 | |
ecfcc53f EB |
350 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
351 | return rc; | |
e114e473 CS |
352 | } |
353 | ||
354 | /** | |
355 | * smack_sb_mount - Smack check for mounting | |
356 | * @dev_name: unused | |
251a2a95 | 357 | * @path: mount point |
e114e473 CS |
358 | * @type: unused |
359 | * @flags: unused | |
360 | * @data: unused | |
361 | * | |
362 | * Returns 0 if current can write the floor of the filesystem | |
363 | * being mounted on, an error code otherwise. | |
364 | */ | |
b5266eb4 | 365 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
366 | char *type, unsigned long flags, void *data) |
367 | { | |
b5266eb4 | 368 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 369 | struct smk_audit_info ad; |
e114e473 | 370 | |
ecfcc53f EB |
371 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
372 | smk_ad_setfield_u_fs_path(&ad, *path); | |
373 | ||
374 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
375 | } |
376 | ||
377 | /** | |
378 | * smack_sb_umount - Smack check for unmounting | |
379 | * @mnt: file system to unmount | |
380 | * @flags: unused | |
381 | * | |
382 | * Returns 0 if current can write the floor of the filesystem | |
383 | * being unmounted, an error code otherwise. | |
384 | */ | |
385 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
386 | { | |
387 | struct superblock_smack *sbp; | |
ecfcc53f | 388 | struct smk_audit_info ad; |
e114e473 | 389 | |
ecfcc53f | 390 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
de27a5bf | 391 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); |
ecfcc53f | 392 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
e114e473 | 393 | |
ecfcc53f EB |
394 | sbp = mnt->mnt_sb->s_security; |
395 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
396 | } |
397 | ||
398 | /* | |
399 | * Inode hooks | |
400 | */ | |
401 | ||
402 | /** | |
403 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 404 | * @inode: the inode in need of a blob |
e114e473 CS |
405 | * |
406 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
407 | */ | |
408 | static int smack_inode_alloc_security(struct inode *inode) | |
409 | { | |
86a264ab | 410 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
411 | if (inode->i_security == NULL) |
412 | return -ENOMEM; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | /** | |
417 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 418 | * @inode: the inode with a blob |
e114e473 CS |
419 | * |
420 | * Clears the blob pointer in inode | |
421 | */ | |
422 | static void smack_inode_free_security(struct inode *inode) | |
423 | { | |
424 | kfree(inode->i_security); | |
425 | inode->i_security = NULL; | |
426 | } | |
427 | ||
428 | /** | |
429 | * smack_inode_init_security - copy out the smack from an inode | |
430 | * @inode: the inode | |
431 | * @dir: unused | |
432 | * @name: where to put the attribute name | |
433 | * @value: where to put the attribute value | |
434 | * @len: where to put the length of the attribute | |
435 | * | |
436 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
437 | */ | |
438 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
439 | char **name, void **value, size_t *len) | |
440 | { | |
441 | char *isp = smk_of_inode(inode); | |
442 | ||
443 | if (name) { | |
444 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
445 | if (*name == NULL) | |
446 | return -ENOMEM; | |
447 | } | |
448 | ||
449 | if (value) { | |
450 | *value = kstrdup(isp, GFP_KERNEL); | |
451 | if (*value == NULL) | |
452 | return -ENOMEM; | |
453 | } | |
454 | ||
455 | if (len) | |
456 | *len = strlen(isp) + 1; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | /** | |
462 | * smack_inode_link - Smack check on link | |
463 | * @old_dentry: the existing object | |
464 | * @dir: unused | |
465 | * @new_dentry: the new object | |
466 | * | |
467 | * Returns 0 if access is permitted, an error code otherwise | |
468 | */ | |
469 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
470 | struct dentry *new_dentry) | |
471 | { | |
e114e473 | 472 | char *isp; |
ecfcc53f EB |
473 | struct smk_audit_info ad; |
474 | int rc; | |
475 | ||
476 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
477 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
478 | |
479 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 480 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
481 | |
482 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
483 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
484 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
485 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
486 | } |
487 | ||
488 | return rc; | |
489 | } | |
490 | ||
491 | /** | |
492 | * smack_inode_unlink - Smack check on inode deletion | |
493 | * @dir: containing directory object | |
494 | * @dentry: file to unlink | |
495 | * | |
496 | * Returns 0 if current can write the containing directory | |
497 | * and the object, error code otherwise | |
498 | */ | |
499 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
500 | { | |
501 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 502 | struct smk_audit_info ad; |
e114e473 CS |
503 | int rc; |
504 | ||
ecfcc53f EB |
505 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
506 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
507 | ||
e114e473 CS |
508 | /* |
509 | * You need write access to the thing you're unlinking | |
510 | */ | |
ecfcc53f EB |
511 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
512 | if (rc == 0) { | |
e114e473 CS |
513 | /* |
514 | * You also need write access to the containing directory | |
515 | */ | |
ecfcc53f EB |
516 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
517 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
518 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
519 | } | |
e114e473 CS |
520 | return rc; |
521 | } | |
522 | ||
523 | /** | |
524 | * smack_inode_rmdir - Smack check on directory deletion | |
525 | * @dir: containing directory object | |
526 | * @dentry: directory to unlink | |
527 | * | |
528 | * Returns 0 if current can write the containing directory | |
529 | * and the directory, error code otherwise | |
530 | */ | |
531 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
532 | { | |
ecfcc53f | 533 | struct smk_audit_info ad; |
e114e473 CS |
534 | int rc; |
535 | ||
ecfcc53f EB |
536 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
537 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
538 | ||
e114e473 CS |
539 | /* |
540 | * You need write access to the thing you're removing | |
541 | */ | |
ecfcc53f EB |
542 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
543 | if (rc == 0) { | |
e114e473 CS |
544 | /* |
545 | * You also need write access to the containing directory | |
546 | */ | |
ecfcc53f EB |
547 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
548 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
549 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
550 | } | |
e114e473 CS |
551 | |
552 | return rc; | |
553 | } | |
554 | ||
555 | /** | |
556 | * smack_inode_rename - Smack check on rename | |
557 | * @old_inode: the old directory | |
558 | * @old_dentry: unused | |
559 | * @new_inode: the new directory | |
560 | * @new_dentry: unused | |
561 | * | |
562 | * Read and write access is required on both the old and | |
563 | * new directories. | |
564 | * | |
565 | * Returns 0 if access is permitted, an error code otherwise | |
566 | */ | |
567 | static int smack_inode_rename(struct inode *old_inode, | |
568 | struct dentry *old_dentry, | |
569 | struct inode *new_inode, | |
570 | struct dentry *new_dentry) | |
571 | { | |
572 | int rc; | |
573 | char *isp; | |
ecfcc53f EB |
574 | struct smk_audit_info ad; |
575 | ||
576 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
577 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
578 | |
579 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 580 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
581 | |
582 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
583 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
584 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
585 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 586 | } |
e114e473 CS |
587 | return rc; |
588 | } | |
589 | ||
590 | /** | |
591 | * smack_inode_permission - Smack version of permission() | |
592 | * @inode: the inode in question | |
593 | * @mask: the access requested | |
e114e473 CS |
594 | * |
595 | * This is the important Smack hook. | |
596 | * | |
597 | * Returns 0 if access is permitted, -EACCES otherwise | |
598 | */ | |
b77b0646 | 599 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 600 | { |
ecfcc53f | 601 | struct smk_audit_info ad; |
e114e473 CS |
602 | /* |
603 | * No permission to check. Existence test. Yup, it's there. | |
604 | */ | |
605 | if (mask == 0) | |
606 | return 0; | |
ecfcc53f EB |
607 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
608 | smk_ad_setfield_u_fs_inode(&ad, inode); | |
609 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
610 | } |
611 | ||
612 | /** | |
613 | * smack_inode_setattr - Smack check for setting attributes | |
614 | * @dentry: the object | |
615 | * @iattr: for the force flag | |
616 | * | |
617 | * Returns 0 if access is permitted, an error code otherwise | |
618 | */ | |
619 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
620 | { | |
ecfcc53f | 621 | struct smk_audit_info ad; |
e114e473 CS |
622 | /* |
623 | * Need to allow for clearing the setuid bit. | |
624 | */ | |
625 | if (iattr->ia_valid & ATTR_FORCE) | |
626 | return 0; | |
ecfcc53f EB |
627 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
628 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 629 | |
ecfcc53f | 630 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
631 | } |
632 | ||
633 | /** | |
634 | * smack_inode_getattr - Smack check for getting attributes | |
635 | * @mnt: unused | |
636 | * @dentry: the object | |
637 | * | |
638 | * Returns 0 if access is permitted, an error code otherwise | |
639 | */ | |
640 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
641 | { | |
ecfcc53f EB |
642 | struct smk_audit_info ad; |
643 | ||
644 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
645 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
646 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
647 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
648 | } |
649 | ||
650 | /** | |
651 | * smack_inode_setxattr - Smack check for setting xattrs | |
652 | * @dentry: the object | |
653 | * @name: name of the attribute | |
654 | * @value: unused | |
655 | * @size: unused | |
656 | * @flags: unused | |
657 | * | |
658 | * This protects the Smack attribute explicitly. | |
659 | * | |
660 | * Returns 0 if access is permitted, an error code otherwise | |
661 | */ | |
8f0cfa52 DH |
662 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
663 | const void *value, size_t size, int flags) | |
e114e473 | 664 | { |
ecfcc53f | 665 | struct smk_audit_info ad; |
bcdca225 | 666 | int rc = 0; |
e114e473 | 667 | |
bcdca225 CS |
668 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
669 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
670 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
671 | if (!capable(CAP_MAC_ADMIN)) | |
672 | rc = -EPERM; | |
defc433b EB |
673 | /* |
674 | * check label validity here so import wont fail on | |
675 | * post_setxattr | |
676 | */ | |
677 | if (size == 0 || size >= SMK_LABELLEN || | |
678 | smk_import(value, size) == NULL) | |
4303154e | 679 | rc = -EINVAL; |
bcdca225 CS |
680 | } else |
681 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
682 | ||
ecfcc53f EB |
683 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
684 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
685 | ||
bcdca225 | 686 | if (rc == 0) |
ecfcc53f | 687 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
688 | |
689 | return rc; | |
e114e473 CS |
690 | } |
691 | ||
692 | /** | |
693 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
694 | * @dentry: object | |
695 | * @name: attribute name | |
696 | * @value: attribute value | |
697 | * @size: attribute size | |
698 | * @flags: unused | |
699 | * | |
700 | * Set the pointer in the inode blob to the entry found | |
701 | * in the master label list. | |
702 | */ | |
8f0cfa52 DH |
703 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
704 | const void *value, size_t size, int flags) | |
e114e473 CS |
705 | { |
706 | struct inode_smack *isp; | |
707 | char *nsp; | |
708 | ||
709 | /* | |
710 | * Not SMACK | |
711 | */ | |
712 | if (strcmp(name, XATTR_NAME_SMACK)) | |
713 | return; | |
714 | ||
e114e473 CS |
715 | isp = dentry->d_inode->i_security; |
716 | ||
717 | /* | |
718 | * No locking is done here. This is a pointer | |
719 | * assignment. | |
720 | */ | |
721 | nsp = smk_import(value, size); | |
722 | if (nsp != NULL) | |
723 | isp->smk_inode = nsp; | |
724 | else | |
725 | isp->smk_inode = smack_known_invalid.smk_known; | |
726 | ||
727 | return; | |
728 | } | |
729 | ||
730 | /* | |
731 | * smack_inode_getxattr - Smack check on getxattr | |
732 | * @dentry: the object | |
733 | * @name: unused | |
734 | * | |
735 | * Returns 0 if access is permitted, an error code otherwise | |
736 | */ | |
8f0cfa52 | 737 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 738 | { |
ecfcc53f EB |
739 | struct smk_audit_info ad; |
740 | ||
741 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
742 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
743 | ||
744 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
745 | } |
746 | ||
747 | /* | |
748 | * smack_inode_removexattr - Smack check on removexattr | |
749 | * @dentry: the object | |
750 | * @name: name of the attribute | |
751 | * | |
752 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
753 | * | |
754 | * Returns 0 if access is permitted, an error code otherwise | |
755 | */ | |
8f0cfa52 | 756 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 757 | { |
ecfcc53f | 758 | struct smk_audit_info ad; |
bcdca225 | 759 | int rc = 0; |
e114e473 | 760 | |
bcdca225 CS |
761 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
762 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
763 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
764 | if (!capable(CAP_MAC_ADMIN)) | |
765 | rc = -EPERM; | |
766 | } else | |
767 | rc = cap_inode_removexattr(dentry, name); | |
768 | ||
ecfcc53f EB |
769 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
770 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
bcdca225 | 771 | if (rc == 0) |
ecfcc53f | 772 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
773 | |
774 | return rc; | |
e114e473 CS |
775 | } |
776 | ||
777 | /** | |
778 | * smack_inode_getsecurity - get smack xattrs | |
779 | * @inode: the object | |
780 | * @name: attribute name | |
781 | * @buffer: where to put the result | |
251a2a95 | 782 | * @alloc: unused |
e114e473 CS |
783 | * |
784 | * Returns the size of the attribute or an error code | |
785 | */ | |
786 | static int smack_inode_getsecurity(const struct inode *inode, | |
787 | const char *name, void **buffer, | |
788 | bool alloc) | |
789 | { | |
790 | struct socket_smack *ssp; | |
791 | struct socket *sock; | |
792 | struct super_block *sbp; | |
793 | struct inode *ip = (struct inode *)inode; | |
794 | char *isp; | |
795 | int ilen; | |
796 | int rc = 0; | |
797 | ||
798 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
799 | isp = smk_of_inode(inode); | |
800 | ilen = strlen(isp) + 1; | |
801 | *buffer = isp; | |
802 | return ilen; | |
803 | } | |
804 | ||
805 | /* | |
806 | * The rest of the Smack xattrs are only on sockets. | |
807 | */ | |
808 | sbp = ip->i_sb; | |
809 | if (sbp->s_magic != SOCKFS_MAGIC) | |
810 | return -EOPNOTSUPP; | |
811 | ||
812 | sock = SOCKET_I(ip); | |
2e1d146a | 813 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
814 | return -EOPNOTSUPP; |
815 | ||
816 | ssp = sock->sk->sk_security; | |
817 | ||
818 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
819 | isp = ssp->smk_in; | |
820 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
821 | isp = ssp->smk_out; | |
822 | else | |
823 | return -EOPNOTSUPP; | |
824 | ||
825 | ilen = strlen(isp) + 1; | |
826 | if (rc == 0) { | |
827 | *buffer = isp; | |
828 | rc = ilen; | |
829 | } | |
830 | ||
831 | return rc; | |
832 | } | |
833 | ||
834 | ||
835 | /** | |
836 | * smack_inode_listsecurity - list the Smack attributes | |
837 | * @inode: the object | |
838 | * @buffer: where they go | |
839 | * @buffer_size: size of buffer | |
840 | * | |
841 | * Returns 0 on success, -EINVAL otherwise | |
842 | */ | |
843 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
844 | size_t buffer_size) | |
845 | { | |
846 | int len = strlen(XATTR_NAME_SMACK); | |
847 | ||
848 | if (buffer != NULL && len <= buffer_size) { | |
849 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
850 | return len; | |
851 | } | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
d20bdda6 AD |
855 | /** |
856 | * smack_inode_getsecid - Extract inode's security id | |
857 | * @inode: inode to extract the info from | |
858 | * @secid: where result will be saved | |
859 | */ | |
860 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
861 | { | |
862 | struct inode_smack *isp = inode->i_security; | |
863 | ||
864 | *secid = smack_to_secid(isp->smk_inode); | |
865 | } | |
866 | ||
e114e473 CS |
867 | /* |
868 | * File Hooks | |
869 | */ | |
870 | ||
871 | /** | |
872 | * smack_file_permission - Smack check on file operations | |
873 | * @file: unused | |
874 | * @mask: unused | |
875 | * | |
876 | * Returns 0 | |
877 | * | |
878 | * Should access checks be done on each read or write? | |
879 | * UNICOS and SELinux say yes. | |
880 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
881 | * | |
882 | * I'll say no for now. Smack does not do the frequent | |
883 | * label changing that SELinux does. | |
884 | */ | |
885 | static int smack_file_permission(struct file *file, int mask) | |
886 | { | |
887 | return 0; | |
888 | } | |
889 | ||
890 | /** | |
891 | * smack_file_alloc_security - assign a file security blob | |
892 | * @file: the object | |
893 | * | |
894 | * The security blob for a file is a pointer to the master | |
895 | * label list, so no allocation is done. | |
896 | * | |
897 | * Returns 0 | |
898 | */ | |
899 | static int smack_file_alloc_security(struct file *file) | |
900 | { | |
86a264ab | 901 | file->f_security = current_security(); |
e114e473 CS |
902 | return 0; |
903 | } | |
904 | ||
905 | /** | |
906 | * smack_file_free_security - clear a file security blob | |
907 | * @file: the object | |
908 | * | |
909 | * The security blob for a file is a pointer to the master | |
910 | * label list, so no memory is freed. | |
911 | */ | |
912 | static void smack_file_free_security(struct file *file) | |
913 | { | |
914 | file->f_security = NULL; | |
915 | } | |
916 | ||
917 | /** | |
918 | * smack_file_ioctl - Smack check on ioctls | |
919 | * @file: the object | |
920 | * @cmd: what to do | |
921 | * @arg: unused | |
922 | * | |
923 | * Relies heavily on the correct use of the ioctl command conventions. | |
924 | * | |
925 | * Returns 0 if allowed, error code otherwise | |
926 | */ | |
927 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
928 | unsigned long arg) | |
929 | { | |
930 | int rc = 0; | |
ecfcc53f EB |
931 | struct smk_audit_info ad; |
932 | ||
933 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
934 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
935 | |
936 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 937 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
938 | |
939 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 940 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
941 | |
942 | return rc; | |
943 | } | |
944 | ||
945 | /** | |
946 | * smack_file_lock - Smack check on file locking | |
947 | * @file: the object | |
251a2a95 | 948 | * @cmd: unused |
e114e473 CS |
949 | * |
950 | * Returns 0 if current has write access, error code otherwise | |
951 | */ | |
952 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
953 | { | |
ecfcc53f EB |
954 | struct smk_audit_info ad; |
955 | ||
956 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
957 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); | |
958 | return smk_curacc(file->f_security, MAY_WRITE, &ad); | |
e114e473 CS |
959 | } |
960 | ||
961 | /** | |
962 | * smack_file_fcntl - Smack check on fcntl | |
963 | * @file: the object | |
964 | * @cmd: what action to check | |
965 | * @arg: unused | |
966 | * | |
967 | * Returns 0 if current has access, error code otherwise | |
968 | */ | |
969 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
970 | unsigned long arg) | |
971 | { | |
ecfcc53f | 972 | struct smk_audit_info ad; |
e114e473 CS |
973 | int rc; |
974 | ||
ecfcc53f EB |
975 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
976 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
977 | ||
e114e473 CS |
978 | switch (cmd) { |
979 | case F_DUPFD: | |
980 | case F_GETFD: | |
981 | case F_GETFL: | |
982 | case F_GETLK: | |
983 | case F_GETOWN: | |
984 | case F_GETSIG: | |
ecfcc53f | 985 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
986 | break; |
987 | case F_SETFD: | |
988 | case F_SETFL: | |
989 | case F_SETLK: | |
990 | case F_SETLKW: | |
991 | case F_SETOWN: | |
992 | case F_SETSIG: | |
ecfcc53f | 993 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
994 | break; |
995 | default: | |
ecfcc53f | 996 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
e114e473 CS |
997 | } |
998 | ||
999 | return rc; | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * smack_file_set_fowner - set the file security blob value | |
1004 | * @file: object in question | |
1005 | * | |
1006 | * Returns 0 | |
1007 | * Further research may be required on this one. | |
1008 | */ | |
1009 | static int smack_file_set_fowner(struct file *file) | |
1010 | { | |
86a264ab | 1011 | file->f_security = current_security(); |
e114e473 CS |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * smack_file_send_sigiotask - Smack on sigio | |
1017 | * @tsk: The target task | |
1018 | * @fown: the object the signal come from | |
1019 | * @signum: unused | |
1020 | * | |
1021 | * Allow a privileged task to get signals even if it shouldn't | |
1022 | * | |
1023 | * Returns 0 if a subject with the object's smack could | |
1024 | * write to the task, an error code otherwise. | |
1025 | */ | |
1026 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1027 | struct fown_struct *fown, int signum) | |
1028 | { | |
1029 | struct file *file; | |
1030 | int rc; | |
ecfcc53f EB |
1031 | char *tsp = tsk->cred->security; |
1032 | struct smk_audit_info ad; | |
e114e473 CS |
1033 | |
1034 | /* | |
1035 | * struct fown_struct is never outside the context of a struct file | |
1036 | */ | |
1037 | file = container_of(fown, struct file, f_owner); | |
ecfcc53f EB |
1038 | /* we don't log here as rc can be overriden */ |
1039 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1040 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1041 | rc = 0; |
1042 | ||
1043 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1044 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1045 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1046 | return rc; |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * smack_file_receive - Smack file receive check | |
1051 | * @file: the object | |
1052 | * | |
1053 | * Returns 0 if current has access, error code otherwise | |
1054 | */ | |
1055 | static int smack_file_receive(struct file *file) | |
1056 | { | |
1057 | int may = 0; | |
ecfcc53f | 1058 | struct smk_audit_info ad; |
e114e473 | 1059 | |
ecfcc53f EB |
1060 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1061 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1062 | /* |
1063 | * This code relies on bitmasks. | |
1064 | */ | |
1065 | if (file->f_mode & FMODE_READ) | |
1066 | may = MAY_READ; | |
1067 | if (file->f_mode & FMODE_WRITE) | |
1068 | may |= MAY_WRITE; | |
1069 | ||
ecfcc53f | 1070 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1071 | } |
1072 | ||
1073 | /* | |
1074 | * Task hooks | |
1075 | */ | |
1076 | ||
ee18d64c DH |
1077 | /** |
1078 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1079 | * @new: the new credentials | |
1080 | * @gfp: the atomicity of any memory allocations | |
1081 | * | |
1082 | * Prepare a blank set of credentials for modification. This must allocate all | |
1083 | * the memory the LSM module might require such that cred_transfer() can | |
1084 | * complete without error. | |
1085 | */ | |
1086 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1087 | { | |
1088 | cred->security = NULL; | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | ||
e114e473 | 1093 | /** |
f1752eec DH |
1094 | * smack_cred_free - "free" task-level security credentials |
1095 | * @cred: the credentials in question | |
e114e473 CS |
1096 | * |
1097 | * Smack isn't using copies of blobs. Everyone | |
1098 | * points to an immutable list. The blobs never go away. | |
1099 | * There is no leak here. | |
1100 | */ | |
f1752eec | 1101 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1102 | { |
f1752eec | 1103 | cred->security = NULL; |
e114e473 CS |
1104 | } |
1105 | ||
d84f4f99 DH |
1106 | /** |
1107 | * smack_cred_prepare - prepare new set of credentials for modification | |
1108 | * @new: the new credentials | |
1109 | * @old: the original credentials | |
1110 | * @gfp: the atomicity of any memory allocations | |
1111 | * | |
1112 | * Prepare a new set of credentials for modification. | |
1113 | */ | |
1114 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1115 | gfp_t gfp) | |
1116 | { | |
1117 | new->security = old->security; | |
1118 | return 0; | |
1119 | } | |
1120 | ||
251a2a95 RD |
1121 | /** |
1122 | * smack_cred_commit - commit new credentials | |
d84f4f99 DH |
1123 | * @new: the new credentials |
1124 | * @old: the original credentials | |
1125 | */ | |
1126 | static void smack_cred_commit(struct cred *new, const struct cred *old) | |
1127 | { | |
1128 | } | |
1129 | ||
ee18d64c DH |
1130 | /** |
1131 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1132 | * @new: the new credentials | |
1133 | * @old: the original credentials | |
1134 | * | |
1135 | * Fill in a set of blank credentials from another set of credentials. | |
1136 | */ | |
1137 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1138 | { | |
1139 | new->security = old->security; | |
1140 | } | |
1141 | ||
3a3b7ce9 DH |
1142 | /** |
1143 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1144 | * @new: points to the set of credentials to be modified. |
1145 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1146 | * |
1147 | * Set the security data for a kernel service. | |
1148 | */ | |
1149 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1150 | { | |
1151 | char *smack = smack_from_secid(secid); | |
1152 | ||
1153 | if (smack == NULL) | |
1154 | return -EINVAL; | |
1155 | ||
1156 | new->security = smack; | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1162 | * @new: points to the set of credentials to be modified |
1163 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1164 | * |
1165 | * Set the file creation context in a set of credentials to the same | |
1166 | * as the objective context of the specified inode | |
1167 | */ | |
1168 | static int smack_kernel_create_files_as(struct cred *new, | |
1169 | struct inode *inode) | |
1170 | { | |
1171 | struct inode_smack *isp = inode->i_security; | |
1172 | ||
1173 | new->security = isp->smk_inode; | |
1174 | return 0; | |
1175 | } | |
1176 | ||
ecfcc53f EB |
1177 | /** |
1178 | * smk_curacc_on_task - helper to log task related access | |
1179 | * @p: the task object | |
1180 | * @access : the access requested | |
1181 | * | |
1182 | * Return 0 if access is permitted | |
1183 | */ | |
1184 | static int smk_curacc_on_task(struct task_struct *p, int access) | |
1185 | { | |
1186 | struct smk_audit_info ad; | |
1187 | ||
1188 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1189 | smk_ad_setfield_u_tsk(&ad, p); | |
1190 | return smk_curacc(task_security(p), access, &ad); | |
1191 | } | |
1192 | ||
e114e473 CS |
1193 | /** |
1194 | * smack_task_setpgid - Smack check on setting pgid | |
1195 | * @p: the task object | |
1196 | * @pgid: unused | |
1197 | * | |
1198 | * Return 0 if write access is permitted | |
1199 | */ | |
1200 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1201 | { | |
ecfcc53f | 1202 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1203 | } |
1204 | ||
1205 | /** | |
1206 | * smack_task_getpgid - Smack access check for getpgid | |
1207 | * @p: the object task | |
1208 | * | |
1209 | * Returns 0 if current can read the object task, error code otherwise | |
1210 | */ | |
1211 | static int smack_task_getpgid(struct task_struct *p) | |
1212 | { | |
ecfcc53f | 1213 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1214 | } |
1215 | ||
1216 | /** | |
1217 | * smack_task_getsid - Smack access check for getsid | |
1218 | * @p: the object task | |
1219 | * | |
1220 | * Returns 0 if current can read the object task, error code otherwise | |
1221 | */ | |
1222 | static int smack_task_getsid(struct task_struct *p) | |
1223 | { | |
ecfcc53f | 1224 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1225 | } |
1226 | ||
1227 | /** | |
1228 | * smack_task_getsecid - get the secid of the task | |
1229 | * @p: the object task | |
1230 | * @secid: where to put the result | |
1231 | * | |
1232 | * Sets the secid to contain a u32 version of the smack label. | |
1233 | */ | |
1234 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1235 | { | |
c69e8d9c | 1236 | *secid = smack_to_secid(task_security(p)); |
e114e473 CS |
1237 | } |
1238 | ||
1239 | /** | |
1240 | * smack_task_setnice - Smack check on setting nice | |
1241 | * @p: the task object | |
1242 | * @nice: unused | |
1243 | * | |
1244 | * Return 0 if write access is permitted | |
1245 | */ | |
1246 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1247 | { | |
bcdca225 CS |
1248 | int rc; |
1249 | ||
1250 | rc = cap_task_setnice(p, nice); | |
1251 | if (rc == 0) | |
ecfcc53f | 1252 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1253 | return rc; |
e114e473 CS |
1254 | } |
1255 | ||
1256 | /** | |
1257 | * smack_task_setioprio - Smack check on setting ioprio | |
1258 | * @p: the task object | |
1259 | * @ioprio: unused | |
1260 | * | |
1261 | * Return 0 if write access is permitted | |
1262 | */ | |
1263 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1264 | { | |
bcdca225 CS |
1265 | int rc; |
1266 | ||
1267 | rc = cap_task_setioprio(p, ioprio); | |
1268 | if (rc == 0) | |
ecfcc53f | 1269 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1270 | return rc; |
e114e473 CS |
1271 | } |
1272 | ||
1273 | /** | |
1274 | * smack_task_getioprio - Smack check on reading ioprio | |
1275 | * @p: the task object | |
1276 | * | |
1277 | * Return 0 if read access is permitted | |
1278 | */ | |
1279 | static int smack_task_getioprio(struct task_struct *p) | |
1280 | { | |
ecfcc53f | 1281 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1282 | } |
1283 | ||
1284 | /** | |
1285 | * smack_task_setscheduler - Smack check on setting scheduler | |
1286 | * @p: the task object | |
1287 | * @policy: unused | |
1288 | * @lp: unused | |
1289 | * | |
1290 | * Return 0 if read access is permitted | |
1291 | */ | |
1292 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1293 | struct sched_param *lp) | |
1294 | { | |
bcdca225 CS |
1295 | int rc; |
1296 | ||
1297 | rc = cap_task_setscheduler(p, policy, lp); | |
1298 | if (rc == 0) | |
ecfcc53f | 1299 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1300 | return rc; |
e114e473 CS |
1301 | } |
1302 | ||
1303 | /** | |
1304 | * smack_task_getscheduler - Smack check on reading scheduler | |
1305 | * @p: the task object | |
1306 | * | |
1307 | * Return 0 if read access is permitted | |
1308 | */ | |
1309 | static int smack_task_getscheduler(struct task_struct *p) | |
1310 | { | |
ecfcc53f | 1311 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1312 | } |
1313 | ||
1314 | /** | |
1315 | * smack_task_movememory - Smack check on moving memory | |
1316 | * @p: the task object | |
1317 | * | |
1318 | * Return 0 if write access is permitted | |
1319 | */ | |
1320 | static int smack_task_movememory(struct task_struct *p) | |
1321 | { | |
ecfcc53f | 1322 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1323 | } |
1324 | ||
1325 | /** | |
1326 | * smack_task_kill - Smack check on signal delivery | |
1327 | * @p: the task object | |
1328 | * @info: unused | |
1329 | * @sig: unused | |
1330 | * @secid: identifies the smack to use in lieu of current's | |
1331 | * | |
1332 | * Return 0 if write access is permitted | |
1333 | * | |
1334 | * The secid behavior is an artifact of an SELinux hack | |
1335 | * in the USB code. Someday it may go away. | |
1336 | */ | |
1337 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1338 | int sig, u32 secid) | |
1339 | { | |
ecfcc53f EB |
1340 | struct smk_audit_info ad; |
1341 | ||
1342 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1343 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1344 | /* |
1345 | * Sending a signal requires that the sender | |
1346 | * can write the receiver. | |
1347 | */ | |
1348 | if (secid == 0) | |
ecfcc53f | 1349 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
e114e473 CS |
1350 | /* |
1351 | * If the secid isn't 0 we're dealing with some USB IO | |
1352 | * specific behavior. This is not clean. For one thing | |
1353 | * we can't take privilege into account. | |
1354 | */ | |
ecfcc53f EB |
1355 | return smk_access(smack_from_secid(secid), task_security(p), |
1356 | MAY_WRITE, &ad); | |
e114e473 CS |
1357 | } |
1358 | ||
1359 | /** | |
1360 | * smack_task_wait - Smack access check for waiting | |
1361 | * @p: task to wait for | |
1362 | * | |
1363 | * Returns 0 if current can wait for p, error code otherwise | |
1364 | */ | |
1365 | static int smack_task_wait(struct task_struct *p) | |
1366 | { | |
ecfcc53f EB |
1367 | struct smk_audit_info ad; |
1368 | char *sp = current_security(); | |
1369 | char *tsp = task_security(p); | |
e114e473 CS |
1370 | int rc; |
1371 | ||
ecfcc53f EB |
1372 | /* we don't log here, we can be overriden */ |
1373 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); | |
e114e473 | 1374 | if (rc == 0) |
ecfcc53f | 1375 | goto out_log; |
e114e473 CS |
1376 | |
1377 | /* | |
1378 | * Allow the operation to succeed if either task | |
1379 | * has privilege to perform operations that might | |
1380 | * account for the smack labels having gotten to | |
1381 | * be different in the first place. | |
1382 | * | |
5cd9c58f | 1383 | * This breaks the strict subject/object access |
e114e473 CS |
1384 | * control ideal, taking the object's privilege |
1385 | * state into account in the decision as well as | |
1386 | * the smack value. | |
1387 | */ | |
5cd9c58f | 1388 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1389 | rc = 0; |
1390 | /* we log only if we didn't get overriden */ | |
1391 | out_log: | |
1392 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1393 | smk_ad_setfield_u_tsk(&ad, p); | |
1394 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1395 | return rc; |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * smack_task_to_inode - copy task smack into the inode blob | |
1400 | * @p: task to copy from | |
251a2a95 | 1401 | * @inode: inode to copy to |
e114e473 CS |
1402 | * |
1403 | * Sets the smack pointer in the inode security blob | |
1404 | */ | |
1405 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1406 | { | |
1407 | struct inode_smack *isp = inode->i_security; | |
c69e8d9c | 1408 | isp->smk_inode = task_security(p); |
e114e473 CS |
1409 | } |
1410 | ||
1411 | /* | |
1412 | * Socket hooks. | |
1413 | */ | |
1414 | ||
1415 | /** | |
1416 | * smack_sk_alloc_security - Allocate a socket blob | |
1417 | * @sk: the socket | |
1418 | * @family: unused | |
251a2a95 | 1419 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1420 | * |
1421 | * Assign Smack pointers to current | |
1422 | * | |
1423 | * Returns 0 on success, -ENOMEM is there's no memory | |
1424 | */ | |
1425 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1426 | { | |
86a264ab | 1427 | char *csp = current_security(); |
e114e473 CS |
1428 | struct socket_smack *ssp; |
1429 | ||
1430 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1431 | if (ssp == NULL) | |
1432 | return -ENOMEM; | |
1433 | ||
1434 | ssp->smk_in = csp; | |
1435 | ssp->smk_out = csp; | |
1436 | ssp->smk_packet[0] = '\0'; | |
1437 | ||
1438 | sk->sk_security = ssp; | |
1439 | ||
1440 | return 0; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * smack_sk_free_security - Free a socket blob | |
1445 | * @sk: the socket | |
1446 | * | |
1447 | * Clears the blob pointer | |
1448 | */ | |
1449 | static void smack_sk_free_security(struct sock *sk) | |
1450 | { | |
1451 | kfree(sk->sk_security); | |
1452 | } | |
1453 | ||
07feee8f PM |
1454 | /** |
1455 | * smack_host_label - check host based restrictions | |
1456 | * @sip: the object end | |
1457 | * | |
1458 | * looks for host based access restrictions | |
1459 | * | |
1460 | * This version will only be appropriate for really small sets of single label | |
1461 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1462 | * taken before calling this function. | |
1463 | * | |
1464 | * Returns the label of the far end or NULL if it's not special. | |
1465 | */ | |
1466 | static char *smack_host_label(struct sockaddr_in *sip) | |
1467 | { | |
1468 | struct smk_netlbladdr *snp; | |
1469 | struct in_addr *siap = &sip->sin_addr; | |
1470 | ||
1471 | if (siap->s_addr == 0) | |
1472 | return NULL; | |
1473 | ||
1474 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1475 | /* | |
1476 | * we break after finding the first match because | |
1477 | * the list is sorted from longest to shortest mask | |
1478 | * so we have found the most specific match | |
1479 | */ | |
1480 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1481 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1482 | /* we have found the special CIPSO option */ | |
1483 | if (snp->smk_label == smack_cipso_option) | |
1484 | return NULL; | |
07feee8f | 1485 | return snp->smk_label; |
4303154e | 1486 | } |
07feee8f PM |
1487 | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
e114e473 CS |
1491 | /** |
1492 | * smack_set_catset - convert a capset to netlabel mls categories | |
1493 | * @catset: the Smack categories | |
1494 | * @sap: where to put the netlabel categories | |
1495 | * | |
1496 | * Allocates and fills attr.mls.cat | |
1497 | */ | |
1498 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1499 | { | |
1500 | unsigned char *cp; | |
1501 | unsigned char m; | |
1502 | int cat; | |
1503 | int rc; | |
1504 | int byte; | |
1505 | ||
c60264c4 | 1506 | if (!catset) |
e114e473 CS |
1507 | return; |
1508 | ||
1509 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1510 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1511 | sap->attr.mls.cat->startbit = 0; | |
1512 | ||
1513 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1514 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1515 | if ((m & *cp) == 0) | |
1516 | continue; | |
1517 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1518 | cat, GFP_ATOMIC); | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | /** | |
1523 | * smack_to_secattr - fill a secattr from a smack value | |
1524 | * @smack: the smack value | |
1525 | * @nlsp: where the result goes | |
1526 | * | |
1527 | * Casey says that CIPSO is good enough for now. | |
1528 | * It can be used to effect. | |
1529 | * It can also be abused to effect when necessary. | |
1530 | * Appologies to the TSIG group in general and GW in particular. | |
1531 | */ | |
1532 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1533 | { | |
1534 | struct smack_cipso cipso; | |
1535 | int rc; | |
1536 | ||
6d3dc07c CS |
1537 | nlsp->domain = smack; |
1538 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1539 | |
6d3dc07c CS |
1540 | rc = smack_to_cipso(smack, &cipso); |
1541 | if (rc == 0) { | |
1542 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1543 | smack_set_catset(cipso.smk_catset, nlsp); | |
1544 | } else { | |
1545 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1546 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1547 | } |
1548 | } | |
1549 | ||
1550 | /** | |
1551 | * smack_netlabel - Set the secattr on a socket | |
1552 | * @sk: the socket | |
6d3dc07c | 1553 | * @labeled: socket label scheme |
e114e473 CS |
1554 | * |
1555 | * Convert the outbound smack value (smk_out) to a | |
1556 | * secattr and attach it to the socket. | |
1557 | * | |
1558 | * Returns 0 on success or an error code | |
1559 | */ | |
6d3dc07c | 1560 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1561 | { |
07feee8f | 1562 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1563 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1564 | int rc = 0; |
e114e473 | 1565 | |
6d3dc07c CS |
1566 | /* |
1567 | * Usually the netlabel code will handle changing the | |
1568 | * packet labeling based on the label. | |
1569 | * The case of a single label host is different, because | |
1570 | * a single label host should never get a labeled packet | |
1571 | * even though the label is usually associated with a packet | |
1572 | * label. | |
1573 | */ | |
1574 | local_bh_disable(); | |
1575 | bh_lock_sock_nested(sk); | |
1576 | ||
1577 | if (ssp->smk_out == smack_net_ambient || | |
1578 | labeled == SMACK_UNLABELED_SOCKET) | |
1579 | netlbl_sock_delattr(sk); | |
1580 | else { | |
1581 | netlbl_secattr_init(&secattr); | |
1582 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1583 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1584 | netlbl_secattr_destroy(&secattr); |
1585 | } | |
1586 | ||
1587 | bh_unlock_sock(sk); | |
1588 | local_bh_enable(); | |
4bc87e62 | 1589 | |
e114e473 CS |
1590 | return rc; |
1591 | } | |
1592 | ||
07feee8f PM |
1593 | /** |
1594 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1595 | * @sk: the socket | |
1596 | * @sap: the destination address | |
1597 | * | |
1598 | * Set the correct secattr for the given socket based on the destination | |
1599 | * address and perform any outbound access checks needed. | |
1600 | * | |
1601 | * Returns 0 on success or an error code. | |
1602 | * | |
1603 | */ | |
1604 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1605 | { | |
1606 | int rc; | |
1607 | int sk_lbl; | |
1608 | char *hostsp; | |
1609 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1610 | struct smk_audit_info ad; |
07feee8f PM |
1611 | |
1612 | rcu_read_lock(); | |
1613 | hostsp = smack_host_label(sap); | |
1614 | if (hostsp != NULL) { | |
1615 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1616 | #ifdef CONFIG_AUDIT |
1617 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1618 | ad.a.u.net.family = sap->sin_family; | |
1619 | ad.a.u.net.dport = sap->sin_port; | |
1620 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1621 | #endif | |
1622 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1623 | } else { |
1624 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1625 | rc = 0; | |
1626 | } | |
1627 | rcu_read_unlock(); | |
1628 | if (rc != 0) | |
1629 | return rc; | |
1630 | ||
1631 | return smack_netlabel(sk, sk_lbl); | |
1632 | } | |
1633 | ||
e114e473 CS |
1634 | /** |
1635 | * smack_inode_setsecurity - set smack xattrs | |
1636 | * @inode: the object | |
1637 | * @name: attribute name | |
1638 | * @value: attribute value | |
1639 | * @size: size of the attribute | |
1640 | * @flags: unused | |
1641 | * | |
1642 | * Sets the named attribute in the appropriate blob | |
1643 | * | |
1644 | * Returns 0 on success, or an error code | |
1645 | */ | |
1646 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1647 | const void *value, size_t size, int flags) | |
1648 | { | |
1649 | char *sp; | |
1650 | struct inode_smack *nsp = inode->i_security; | |
1651 | struct socket_smack *ssp; | |
1652 | struct socket *sock; | |
4bc87e62 | 1653 | int rc = 0; |
e114e473 | 1654 | |
4303154e | 1655 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1656 | return -EACCES; |
1657 | ||
1658 | sp = smk_import(value, size); | |
1659 | if (sp == NULL) | |
1660 | return -EINVAL; | |
1661 | ||
1662 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1663 | nsp->smk_inode = sp; | |
ddd29ec6 | 1664 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1665 | return 0; |
1666 | } | |
1667 | /* | |
1668 | * The rest of the Smack xattrs are only on sockets. | |
1669 | */ | |
1670 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1671 | return -EOPNOTSUPP; | |
1672 | ||
1673 | sock = SOCKET_I(inode); | |
2e1d146a | 1674 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1675 | return -EOPNOTSUPP; |
1676 | ||
1677 | ssp = sock->sk->sk_security; | |
1678 | ||
1679 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1680 | ssp->smk_in = sp; | |
1681 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1682 | ssp->smk_out = sp; | |
6d3dc07c | 1683 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
4bc87e62 CS |
1684 | if (rc != 0) |
1685 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1686 | __func__, -rc); | |
e114e473 CS |
1687 | } else |
1688 | return -EOPNOTSUPP; | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | /** | |
1694 | * smack_socket_post_create - finish socket setup | |
1695 | * @sock: the socket | |
1696 | * @family: protocol family | |
1697 | * @type: unused | |
1698 | * @protocol: unused | |
1699 | * @kern: unused | |
1700 | * | |
1701 | * Sets the netlabel information on the socket | |
1702 | * | |
1703 | * Returns 0 on success, and error code otherwise | |
1704 | */ | |
1705 | static int smack_socket_post_create(struct socket *sock, int family, | |
1706 | int type, int protocol, int kern) | |
1707 | { | |
2e1d146a | 1708 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1709 | return 0; |
1710 | /* | |
1711 | * Set the outbound netlbl. | |
1712 | */ | |
6d3dc07c CS |
1713 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1714 | } | |
1715 | ||
6d3dc07c CS |
1716 | /** |
1717 | * smack_socket_connect - connect access check | |
1718 | * @sock: the socket | |
1719 | * @sap: the other end | |
1720 | * @addrlen: size of sap | |
1721 | * | |
1722 | * Verifies that a connection may be possible | |
1723 | * | |
1724 | * Returns 0 on success, and error code otherwise | |
1725 | */ | |
1726 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1727 | int addrlen) | |
1728 | { | |
6d3dc07c CS |
1729 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1730 | return 0; | |
6d3dc07c CS |
1731 | if (addrlen < sizeof(struct sockaddr_in)) |
1732 | return -EINVAL; | |
1733 | ||
07feee8f | 1734 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1735 | } |
1736 | ||
1737 | /** | |
1738 | * smack_flags_to_may - convert S_ to MAY_ values | |
1739 | * @flags: the S_ value | |
1740 | * | |
1741 | * Returns the equivalent MAY_ value | |
1742 | */ | |
1743 | static int smack_flags_to_may(int flags) | |
1744 | { | |
1745 | int may = 0; | |
1746 | ||
1747 | if (flags & S_IRUGO) | |
1748 | may |= MAY_READ; | |
1749 | if (flags & S_IWUGO) | |
1750 | may |= MAY_WRITE; | |
1751 | if (flags & S_IXUGO) | |
1752 | may |= MAY_EXEC; | |
1753 | ||
1754 | return may; | |
1755 | } | |
1756 | ||
1757 | /** | |
1758 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1759 | * @msg: the object | |
1760 | * | |
1761 | * Returns 0 | |
1762 | */ | |
1763 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1764 | { | |
86a264ab | 1765 | msg->security = current_security(); |
e114e473 CS |
1766 | return 0; |
1767 | } | |
1768 | ||
1769 | /** | |
1770 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1771 | * @msg: the object | |
1772 | * | |
1773 | * Clears the blob pointer | |
1774 | */ | |
1775 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1776 | { | |
1777 | msg->security = NULL; | |
1778 | } | |
1779 | ||
1780 | /** | |
1781 | * smack_of_shm - the smack pointer for the shm | |
1782 | * @shp: the object | |
1783 | * | |
1784 | * Returns a pointer to the smack value | |
1785 | */ | |
1786 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1787 | { | |
1788 | return (char *)shp->shm_perm.security; | |
1789 | } | |
1790 | ||
1791 | /** | |
1792 | * smack_shm_alloc_security - Set the security blob for shm | |
1793 | * @shp: the object | |
1794 | * | |
1795 | * Returns 0 | |
1796 | */ | |
1797 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1798 | { | |
1799 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1800 | ||
86a264ab | 1801 | isp->security = current_security(); |
e114e473 CS |
1802 | return 0; |
1803 | } | |
1804 | ||
1805 | /** | |
1806 | * smack_shm_free_security - Clear the security blob for shm | |
1807 | * @shp: the object | |
1808 | * | |
1809 | * Clears the blob pointer | |
1810 | */ | |
1811 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1812 | { | |
1813 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1814 | ||
1815 | isp->security = NULL; | |
1816 | } | |
1817 | ||
ecfcc53f EB |
1818 | /** |
1819 | * smk_curacc_shm : check if current has access on shm | |
1820 | * @shp : the object | |
1821 | * @access : access requested | |
1822 | * | |
1823 | * Returns 0 if current has the requested access, error code otherwise | |
1824 | */ | |
1825 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
1826 | { | |
1827 | char *ssp = smack_of_shm(shp); | |
1828 | struct smk_audit_info ad; | |
1829 | ||
1830 | #ifdef CONFIG_AUDIT | |
1831 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1832 | ad.a.u.ipc_id = shp->shm_perm.id; | |
1833 | #endif | |
1834 | return smk_curacc(ssp, access, &ad); | |
1835 | } | |
1836 | ||
e114e473 CS |
1837 | /** |
1838 | * smack_shm_associate - Smack access check for shm | |
1839 | * @shp: the object | |
1840 | * @shmflg: access requested | |
1841 | * | |
1842 | * Returns 0 if current has the requested access, error code otherwise | |
1843 | */ | |
1844 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1845 | { | |
e114e473 CS |
1846 | int may; |
1847 | ||
1848 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1849 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1850 | } |
1851 | ||
1852 | /** | |
1853 | * smack_shm_shmctl - Smack access check for shm | |
1854 | * @shp: the object | |
1855 | * @cmd: what it wants to do | |
1856 | * | |
1857 | * Returns 0 if current has the requested access, error code otherwise | |
1858 | */ | |
1859 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1860 | { | |
e114e473 CS |
1861 | int may; |
1862 | ||
1863 | switch (cmd) { | |
1864 | case IPC_STAT: | |
1865 | case SHM_STAT: | |
1866 | may = MAY_READ; | |
1867 | break; | |
1868 | case IPC_SET: | |
1869 | case SHM_LOCK: | |
1870 | case SHM_UNLOCK: | |
1871 | case IPC_RMID: | |
1872 | may = MAY_READWRITE; | |
1873 | break; | |
1874 | case IPC_INFO: | |
1875 | case SHM_INFO: | |
1876 | /* | |
1877 | * System level information. | |
1878 | */ | |
1879 | return 0; | |
1880 | default: | |
1881 | return -EINVAL; | |
1882 | } | |
ecfcc53f | 1883 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1884 | } |
1885 | ||
1886 | /** | |
1887 | * smack_shm_shmat - Smack access for shmat | |
1888 | * @shp: the object | |
1889 | * @shmaddr: unused | |
1890 | * @shmflg: access requested | |
1891 | * | |
1892 | * Returns 0 if current has the requested access, error code otherwise | |
1893 | */ | |
1894 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1895 | int shmflg) | |
1896 | { | |
e114e473 CS |
1897 | int may; |
1898 | ||
1899 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1900 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1901 | } |
1902 | ||
1903 | /** | |
1904 | * smack_of_sem - the smack pointer for the sem | |
1905 | * @sma: the object | |
1906 | * | |
1907 | * Returns a pointer to the smack value | |
1908 | */ | |
1909 | static char *smack_of_sem(struct sem_array *sma) | |
1910 | { | |
1911 | return (char *)sma->sem_perm.security; | |
1912 | } | |
1913 | ||
1914 | /** | |
1915 | * smack_sem_alloc_security - Set the security blob for sem | |
1916 | * @sma: the object | |
1917 | * | |
1918 | * Returns 0 | |
1919 | */ | |
1920 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1921 | { | |
1922 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1923 | ||
86a264ab | 1924 | isp->security = current_security(); |
e114e473 CS |
1925 | return 0; |
1926 | } | |
1927 | ||
1928 | /** | |
1929 | * smack_sem_free_security - Clear the security blob for sem | |
1930 | * @sma: the object | |
1931 | * | |
1932 | * Clears the blob pointer | |
1933 | */ | |
1934 | static void smack_sem_free_security(struct sem_array *sma) | |
1935 | { | |
1936 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1937 | ||
1938 | isp->security = NULL; | |
1939 | } | |
1940 | ||
ecfcc53f EB |
1941 | /** |
1942 | * smk_curacc_sem : check if current has access on sem | |
1943 | * @sma : the object | |
1944 | * @access : access requested | |
1945 | * | |
1946 | * Returns 0 if current has the requested access, error code otherwise | |
1947 | */ | |
1948 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
1949 | { | |
1950 | char *ssp = smack_of_sem(sma); | |
1951 | struct smk_audit_info ad; | |
1952 | ||
1953 | #ifdef CONFIG_AUDIT | |
1954 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1955 | ad.a.u.ipc_id = sma->sem_perm.id; | |
1956 | #endif | |
1957 | return smk_curacc(ssp, access, &ad); | |
1958 | } | |
1959 | ||
e114e473 CS |
1960 | /** |
1961 | * smack_sem_associate - Smack access check for sem | |
1962 | * @sma: the object | |
1963 | * @semflg: access requested | |
1964 | * | |
1965 | * Returns 0 if current has the requested access, error code otherwise | |
1966 | */ | |
1967 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1968 | { | |
e114e473 CS |
1969 | int may; |
1970 | ||
1971 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 1972 | return smk_curacc_sem(sma, may); |
e114e473 CS |
1973 | } |
1974 | ||
1975 | /** | |
1976 | * smack_sem_shmctl - Smack access check for sem | |
1977 | * @sma: the object | |
1978 | * @cmd: what it wants to do | |
1979 | * | |
1980 | * Returns 0 if current has the requested access, error code otherwise | |
1981 | */ | |
1982 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1983 | { | |
e114e473 CS |
1984 | int may; |
1985 | ||
1986 | switch (cmd) { | |
1987 | case GETPID: | |
1988 | case GETNCNT: | |
1989 | case GETZCNT: | |
1990 | case GETVAL: | |
1991 | case GETALL: | |
1992 | case IPC_STAT: | |
1993 | case SEM_STAT: | |
1994 | may = MAY_READ; | |
1995 | break; | |
1996 | case SETVAL: | |
1997 | case SETALL: | |
1998 | case IPC_RMID: | |
1999 | case IPC_SET: | |
2000 | may = MAY_READWRITE; | |
2001 | break; | |
2002 | case IPC_INFO: | |
2003 | case SEM_INFO: | |
2004 | /* | |
2005 | * System level information | |
2006 | */ | |
2007 | return 0; | |
2008 | default: | |
2009 | return -EINVAL; | |
2010 | } | |
2011 | ||
ecfcc53f | 2012 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2013 | } |
2014 | ||
2015 | /** | |
2016 | * smack_sem_semop - Smack checks of semaphore operations | |
2017 | * @sma: the object | |
2018 | * @sops: unused | |
2019 | * @nsops: unused | |
2020 | * @alter: unused | |
2021 | * | |
2022 | * Treated as read and write in all cases. | |
2023 | * | |
2024 | * Returns 0 if access is allowed, error code otherwise | |
2025 | */ | |
2026 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2027 | unsigned nsops, int alter) | |
2028 | { | |
ecfcc53f | 2029 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2030 | } |
2031 | ||
2032 | /** | |
2033 | * smack_msg_alloc_security - Set the security blob for msg | |
2034 | * @msq: the object | |
2035 | * | |
2036 | * Returns 0 | |
2037 | */ | |
2038 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2039 | { | |
2040 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2041 | ||
86a264ab | 2042 | kisp->security = current_security(); |
e114e473 CS |
2043 | return 0; |
2044 | } | |
2045 | ||
2046 | /** | |
2047 | * smack_msg_free_security - Clear the security blob for msg | |
2048 | * @msq: the object | |
2049 | * | |
2050 | * Clears the blob pointer | |
2051 | */ | |
2052 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2053 | { | |
2054 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2055 | ||
2056 | kisp->security = NULL; | |
2057 | } | |
2058 | ||
2059 | /** | |
2060 | * smack_of_msq - the smack pointer for the msq | |
2061 | * @msq: the object | |
2062 | * | |
2063 | * Returns a pointer to the smack value | |
2064 | */ | |
2065 | static char *smack_of_msq(struct msg_queue *msq) | |
2066 | { | |
2067 | return (char *)msq->q_perm.security; | |
2068 | } | |
2069 | ||
ecfcc53f EB |
2070 | /** |
2071 | * smk_curacc_msq : helper to check if current has access on msq | |
2072 | * @msq : the msq | |
2073 | * @access : access requested | |
2074 | * | |
2075 | * return 0 if current has access, error otherwise | |
2076 | */ | |
2077 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2078 | { | |
2079 | char *msp = smack_of_msq(msq); | |
2080 | struct smk_audit_info ad; | |
2081 | ||
2082 | #ifdef CONFIG_AUDIT | |
2083 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2084 | ad.a.u.ipc_id = msq->q_perm.id; | |
2085 | #endif | |
2086 | return smk_curacc(msp, access, &ad); | |
2087 | } | |
2088 | ||
e114e473 CS |
2089 | /** |
2090 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2091 | * @msq: the object | |
2092 | * @msqflg: access requested | |
2093 | * | |
2094 | * Returns 0 if current has the requested access, error code otherwise | |
2095 | */ | |
2096 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2097 | { | |
e114e473 CS |
2098 | int may; |
2099 | ||
2100 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2101 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2102 | } |
2103 | ||
2104 | /** | |
2105 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2106 | * @msq: the object | |
2107 | * @cmd: what it wants to do | |
2108 | * | |
2109 | * Returns 0 if current has the requested access, error code otherwise | |
2110 | */ | |
2111 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2112 | { | |
e114e473 CS |
2113 | int may; |
2114 | ||
2115 | switch (cmd) { | |
2116 | case IPC_STAT: | |
2117 | case MSG_STAT: | |
2118 | may = MAY_READ; | |
2119 | break; | |
2120 | case IPC_SET: | |
2121 | case IPC_RMID: | |
2122 | may = MAY_READWRITE; | |
2123 | break; | |
2124 | case IPC_INFO: | |
2125 | case MSG_INFO: | |
2126 | /* | |
2127 | * System level information | |
2128 | */ | |
2129 | return 0; | |
2130 | default: | |
2131 | return -EINVAL; | |
2132 | } | |
2133 | ||
ecfcc53f | 2134 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2135 | } |
2136 | ||
2137 | /** | |
2138 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2139 | * @msq: the object | |
2140 | * @msg: unused | |
2141 | * @msqflg: access requested | |
2142 | * | |
2143 | * Returns 0 if current has the requested access, error code otherwise | |
2144 | */ | |
2145 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2146 | int msqflg) | |
2147 | { | |
ecfcc53f | 2148 | int may; |
e114e473 | 2149 | |
ecfcc53f EB |
2150 | may = smack_flags_to_may(msqflg); |
2151 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2152 | } |
2153 | ||
2154 | /** | |
2155 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2156 | * @msq: the object | |
2157 | * @msg: unused | |
2158 | * @target: unused | |
2159 | * @type: unused | |
2160 | * @mode: unused | |
2161 | * | |
2162 | * Returns 0 if current has read and write access, error code otherwise | |
2163 | */ | |
2164 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2165 | struct task_struct *target, long type, int mode) | |
2166 | { | |
ecfcc53f | 2167 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2168 | } |
2169 | ||
2170 | /** | |
2171 | * smack_ipc_permission - Smack access for ipc_permission() | |
2172 | * @ipp: the object permissions | |
2173 | * @flag: access requested | |
2174 | * | |
2175 | * Returns 0 if current has read and write access, error code otherwise | |
2176 | */ | |
2177 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2178 | { | |
2179 | char *isp = ipp->security; | |
ecfcc53f EB |
2180 | int may = smack_flags_to_may(flag); |
2181 | struct smk_audit_info ad; | |
e114e473 | 2182 | |
ecfcc53f EB |
2183 | #ifdef CONFIG_AUDIT |
2184 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2185 | ad.a.u.ipc_id = ipp->id; | |
2186 | #endif | |
2187 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2188 | } |
2189 | ||
d20bdda6 AD |
2190 | /** |
2191 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2192 | * @ipp: the object permissions |
d20bdda6 AD |
2193 | * @secid: where result will be saved |
2194 | */ | |
2195 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2196 | { | |
2197 | char *smack = ipp->security; | |
2198 | ||
2199 | *secid = smack_to_secid(smack); | |
2200 | } | |
2201 | ||
e114e473 CS |
2202 | /** |
2203 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
2204 | * @opt_dentry: unused | |
2205 | * @inode: the object | |
2206 | * | |
2207 | * Set the inode's security blob if it hasn't been done already. | |
2208 | */ | |
2209 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2210 | { | |
2211 | struct super_block *sbp; | |
2212 | struct superblock_smack *sbsp; | |
2213 | struct inode_smack *isp; | |
86a264ab | 2214 | char *csp = current_security(); |
e114e473 CS |
2215 | char *fetched; |
2216 | char *final; | |
2217 | struct dentry *dp; | |
2218 | ||
2219 | if (inode == NULL) | |
2220 | return; | |
2221 | ||
2222 | isp = inode->i_security; | |
2223 | ||
2224 | mutex_lock(&isp->smk_lock); | |
2225 | /* | |
2226 | * If the inode is already instantiated | |
2227 | * take the quick way out | |
2228 | */ | |
2229 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2230 | goto unlockandout; | |
2231 | ||
2232 | sbp = inode->i_sb; | |
2233 | sbsp = sbp->s_security; | |
2234 | /* | |
2235 | * We're going to use the superblock default label | |
2236 | * if there's no label on the file. | |
2237 | */ | |
2238 | final = sbsp->smk_default; | |
2239 | ||
e97dcb0e CS |
2240 | /* |
2241 | * If this is the root inode the superblock | |
2242 | * may be in the process of initialization. | |
2243 | * If that is the case use the root value out | |
2244 | * of the superblock. | |
2245 | */ | |
2246 | if (opt_dentry->d_parent == opt_dentry) { | |
2247 | isp->smk_inode = sbsp->smk_root; | |
2248 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2249 | goto unlockandout; | |
2250 | } | |
2251 | ||
e114e473 CS |
2252 | /* |
2253 | * This is pretty hackish. | |
2254 | * Casey says that we shouldn't have to do | |
2255 | * file system specific code, but it does help | |
2256 | * with keeping it simple. | |
2257 | */ | |
2258 | switch (sbp->s_magic) { | |
2259 | case SMACK_MAGIC: | |
2260 | /* | |
2261 | * Casey says that it's a little embarassing | |
2262 | * that the smack file system doesn't do | |
2263 | * extended attributes. | |
2264 | */ | |
2265 | final = smack_known_star.smk_known; | |
2266 | break; | |
2267 | case PIPEFS_MAGIC: | |
2268 | /* | |
2269 | * Casey says pipes are easy (?) | |
2270 | */ | |
2271 | final = smack_known_star.smk_known; | |
2272 | break; | |
2273 | case DEVPTS_SUPER_MAGIC: | |
2274 | /* | |
2275 | * devpts seems content with the label of the task. | |
2276 | * Programs that change smack have to treat the | |
2277 | * pty with respect. | |
2278 | */ | |
2279 | final = csp; | |
2280 | break; | |
2281 | case SOCKFS_MAGIC: | |
2282 | /* | |
2283 | * Casey says sockets get the smack of the task. | |
2284 | */ | |
2285 | final = csp; | |
2286 | break; | |
2287 | case PROC_SUPER_MAGIC: | |
2288 | /* | |
2289 | * Casey says procfs appears not to care. | |
2290 | * The superblock default suffices. | |
2291 | */ | |
2292 | break; | |
2293 | case TMPFS_MAGIC: | |
2294 | /* | |
2295 | * Device labels should come from the filesystem, | |
2296 | * but watch out, because they're volitile, | |
2297 | * getting recreated on every reboot. | |
2298 | */ | |
2299 | final = smack_known_star.smk_known; | |
2300 | /* | |
2301 | * No break. | |
2302 | * | |
2303 | * If a smack value has been set we want to use it, | |
2304 | * but since tmpfs isn't giving us the opportunity | |
2305 | * to set mount options simulate setting the | |
2306 | * superblock default. | |
2307 | */ | |
2308 | default: | |
2309 | /* | |
2310 | * This isn't an understood special case. | |
2311 | * Get the value from the xattr. | |
2312 | * | |
2313 | * No xattr support means, alas, no SMACK label. | |
2314 | * Use the aforeapplied default. | |
2315 | * It would be curious if the label of the task | |
2316 | * does not match that assigned. | |
2317 | */ | |
2318 | if (inode->i_op->getxattr == NULL) | |
2319 | break; | |
2320 | /* | |
2321 | * Get the dentry for xattr. | |
2322 | */ | |
2323 | if (opt_dentry == NULL) { | |
2324 | dp = d_find_alias(inode); | |
2325 | if (dp == NULL) | |
2326 | break; | |
2327 | } else { | |
2328 | dp = dget(opt_dentry); | |
2329 | if (dp == NULL) | |
2330 | break; | |
2331 | } | |
2332 | ||
2333 | fetched = smk_fetch(inode, dp); | |
2334 | if (fetched != NULL) | |
2335 | final = fetched; | |
2336 | ||
2337 | dput(dp); | |
2338 | break; | |
2339 | } | |
2340 | ||
2341 | if (final == NULL) | |
2342 | isp->smk_inode = csp; | |
2343 | else | |
2344 | isp->smk_inode = final; | |
2345 | ||
2346 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2347 | ||
2348 | unlockandout: | |
2349 | mutex_unlock(&isp->smk_lock); | |
2350 | return; | |
2351 | } | |
2352 | ||
2353 | /** | |
2354 | * smack_getprocattr - Smack process attribute access | |
2355 | * @p: the object task | |
2356 | * @name: the name of the attribute in /proc/.../attr | |
2357 | * @value: where to put the result | |
2358 | * | |
2359 | * Places a copy of the task Smack into value | |
2360 | * | |
2361 | * Returns the length of the smack label or an error code | |
2362 | */ | |
2363 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2364 | { | |
2365 | char *cp; | |
2366 | int slen; | |
2367 | ||
2368 | if (strcmp(name, "current") != 0) | |
2369 | return -EINVAL; | |
2370 | ||
c69e8d9c | 2371 | cp = kstrdup(task_security(p), GFP_KERNEL); |
e114e473 CS |
2372 | if (cp == NULL) |
2373 | return -ENOMEM; | |
2374 | ||
2375 | slen = strlen(cp); | |
2376 | *value = cp; | |
2377 | return slen; | |
2378 | } | |
2379 | ||
2380 | /** | |
2381 | * smack_setprocattr - Smack process attribute setting | |
2382 | * @p: the object task | |
2383 | * @name: the name of the attribute in /proc/.../attr | |
2384 | * @value: the value to set | |
2385 | * @size: the size of the value | |
2386 | * | |
2387 | * Sets the Smack value of the task. Only setting self | |
2388 | * is permitted and only with privilege | |
2389 | * | |
2390 | * Returns the length of the smack label or an error code | |
2391 | */ | |
2392 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2393 | void *value, size_t size) | |
2394 | { | |
d84f4f99 | 2395 | struct cred *new; |
e114e473 CS |
2396 | char *newsmack; |
2397 | ||
e114e473 CS |
2398 | /* |
2399 | * Changing another process' Smack value is too dangerous | |
2400 | * and supports no sane use case. | |
2401 | */ | |
2402 | if (p != current) | |
2403 | return -EPERM; | |
2404 | ||
5cd9c58f DH |
2405 | if (!capable(CAP_MAC_ADMIN)) |
2406 | return -EPERM; | |
2407 | ||
e114e473 CS |
2408 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2409 | return -EINVAL; | |
2410 | ||
2411 | if (strcmp(name, "current") != 0) | |
2412 | return -EINVAL; | |
2413 | ||
2414 | newsmack = smk_import(value, size); | |
2415 | if (newsmack == NULL) | |
2416 | return -EINVAL; | |
2417 | ||
6d3dc07c CS |
2418 | /* |
2419 | * No process is ever allowed the web ("@") label. | |
2420 | */ | |
2421 | if (newsmack == smack_known_web.smk_known) | |
2422 | return -EPERM; | |
2423 | ||
d84f4f99 | 2424 | new = prepare_creds(); |
6d3dc07c | 2425 | if (new == NULL) |
d84f4f99 DH |
2426 | return -ENOMEM; |
2427 | new->security = newsmack; | |
2428 | commit_creds(new); | |
e114e473 CS |
2429 | return size; |
2430 | } | |
2431 | ||
2432 | /** | |
2433 | * smack_unix_stream_connect - Smack access on UDS | |
2434 | * @sock: one socket | |
2435 | * @other: the other socket | |
2436 | * @newsk: unused | |
2437 | * | |
2438 | * Return 0 if a subject with the smack of sock could access | |
2439 | * an object with the smack of other, otherwise an error code | |
2440 | */ | |
2441 | static int smack_unix_stream_connect(struct socket *sock, | |
2442 | struct socket *other, struct sock *newsk) | |
2443 | { | |
2444 | struct inode *sp = SOCK_INODE(sock); | |
2445 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2446 | struct smk_audit_info ad; |
e114e473 | 2447 | |
ecfcc53f EB |
2448 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2449 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2450 | return smk_access(smk_of_inode(sp), smk_of_inode(op), | |
2451 | MAY_READWRITE, &ad); | |
e114e473 CS |
2452 | } |
2453 | ||
2454 | /** | |
2455 | * smack_unix_may_send - Smack access on UDS | |
2456 | * @sock: one socket | |
2457 | * @other: the other socket | |
2458 | * | |
2459 | * Return 0 if a subject with the smack of sock could access | |
2460 | * an object with the smack of other, otherwise an error code | |
2461 | */ | |
2462 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2463 | { | |
2464 | struct inode *sp = SOCK_INODE(sock); | |
2465 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2466 | struct smk_audit_info ad; |
e114e473 | 2467 | |
ecfcc53f EB |
2468 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2469 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2470 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); | |
e114e473 CS |
2471 | } |
2472 | ||
6d3dc07c CS |
2473 | /** |
2474 | * smack_socket_sendmsg - Smack check based on destination host | |
2475 | * @sock: the socket | |
251a2a95 | 2476 | * @msg: the message |
6d3dc07c CS |
2477 | * @size: the size of the message |
2478 | * | |
2479 | * Return 0 if the current subject can write to the destination | |
2480 | * host. This is only a question if the destination is a single | |
2481 | * label host. | |
2482 | */ | |
2483 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2484 | int size) | |
2485 | { | |
2486 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2487 | |
2488 | /* | |
2489 | * Perfectly reasonable for this to be NULL | |
2490 | */ | |
da34d424 | 2491 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2492 | return 0; |
2493 | ||
07feee8f | 2494 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2495 | } |
2496 | ||
2497 | ||
e114e473 | 2498 | /** |
251a2a95 | 2499 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2500 | * @sap: netlabel secattr |
2501 | * @sip: where to put the result | |
2502 | * | |
2503 | * Copies a smack label into sip | |
2504 | */ | |
2505 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2506 | { | |
2507 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2508 | char *sp; |
e114e473 CS |
2509 | int pcat; |
2510 | ||
6d3dc07c | 2511 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2512 | /* |
6d3dc07c | 2513 | * Looks like a CIPSO packet. |
e114e473 CS |
2514 | * If there are flags but no level netlabel isn't |
2515 | * behaving the way we expect it to. | |
2516 | * | |
6d3dc07c | 2517 | * Get the categories, if any |
e114e473 CS |
2518 | * Without guidance regarding the smack value |
2519 | * for the packet fall back on the network | |
2520 | * ambient value. | |
2521 | */ | |
6d3dc07c CS |
2522 | memset(smack, '\0', SMK_LABELLEN); |
2523 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2524 | for (pcat = -1;;) { | |
2525 | pcat = netlbl_secattr_catmap_walk( | |
2526 | sap->attr.mls.cat, pcat + 1); | |
2527 | if (pcat < 0) | |
2528 | break; | |
2529 | smack_catset_bit(pcat, smack); | |
2530 | } | |
2531 | /* | |
2532 | * If it is CIPSO using smack direct mapping | |
2533 | * we are already done. WeeHee. | |
2534 | */ | |
2535 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2536 | memcpy(sip, smack, SMK_MAXLEN); | |
2537 | return; | |
2538 | } | |
2539 | /* | |
2540 | * Look it up in the supplied table if it is not | |
2541 | * a direct mapping. | |
2542 | */ | |
2543 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2544 | return; |
2545 | } | |
6d3dc07c CS |
2546 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2547 | /* | |
2548 | * Looks like a fallback, which gives us a secid. | |
2549 | */ | |
2550 | sp = smack_from_secid(sap->attr.secid); | |
2551 | /* | |
2552 | * This has got to be a bug because it is | |
2553 | * impossible to specify a fallback without | |
2554 | * specifying the label, which will ensure | |
2555 | * it has a secid, and the only way to get a | |
2556 | * secid is from a fallback. | |
2557 | */ | |
2558 | BUG_ON(sp == NULL); | |
2559 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2560 | return; |
2561 | } | |
2562 | /* | |
6d3dc07c CS |
2563 | * Without guidance regarding the smack value |
2564 | * for the packet fall back on the network | |
2565 | * ambient value. | |
e114e473 | 2566 | */ |
6d3dc07c | 2567 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2568 | return; |
2569 | } | |
2570 | ||
2571 | /** | |
2572 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2573 | * @sk: socket | |
2574 | * @skb: packet | |
2575 | * | |
2576 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2577 | */ | |
2578 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2579 | { | |
2580 | struct netlbl_lsm_secattr secattr; | |
2581 | struct socket_smack *ssp = sk->sk_security; | |
2582 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2583 | char *csp; |
e114e473 | 2584 | int rc; |
ecfcc53f | 2585 | struct smk_audit_info ad; |
e114e473 CS |
2586 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2587 | return 0; | |
2588 | ||
2589 | /* | |
2590 | * Translate what netlabel gave us. | |
2591 | */ | |
e114e473 | 2592 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2593 | |
e114e473 | 2594 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2595 | if (rc == 0) { |
e114e473 | 2596 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2597 | csp = smack; |
2598 | } else | |
2599 | csp = smack_net_ambient; | |
2600 | ||
e114e473 | 2601 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2602 | |
ecfcc53f EB |
2603 | #ifdef CONFIG_AUDIT |
2604 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2605 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 2606 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2607 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2608 | #endif | |
e114e473 CS |
2609 | /* |
2610 | * Receiving a packet requires that the other end | |
2611 | * be able to write here. Read access is not required. | |
2612 | * This is the simplist possible security model | |
2613 | * for networking. | |
2614 | */ | |
ecfcc53f | 2615 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2616 | if (rc != 0) |
2617 | netlbl_skbuff_err(skb, rc, 0); | |
2618 | return rc; | |
e114e473 CS |
2619 | } |
2620 | ||
2621 | /** | |
2622 | * smack_socket_getpeersec_stream - pull in packet label | |
2623 | * @sock: the socket | |
2624 | * @optval: user's destination | |
2625 | * @optlen: size thereof | |
251a2a95 | 2626 | * @len: max thereof |
e114e473 CS |
2627 | * |
2628 | * returns zero on success, an error code otherwise | |
2629 | */ | |
2630 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2631 | char __user *optval, | |
2632 | int __user *optlen, unsigned len) | |
2633 | { | |
2634 | struct socket_smack *ssp; | |
2635 | int slen; | |
2636 | int rc = 0; | |
2637 | ||
2638 | ssp = sock->sk->sk_security; | |
2639 | slen = strlen(ssp->smk_packet) + 1; | |
2640 | ||
2641 | if (slen > len) | |
2642 | rc = -ERANGE; | |
2643 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2644 | rc = -EFAULT; | |
2645 | ||
2646 | if (put_user(slen, optlen) != 0) | |
2647 | rc = -EFAULT; | |
2648 | ||
2649 | return rc; | |
2650 | } | |
2651 | ||
2652 | ||
2653 | /** | |
2654 | * smack_socket_getpeersec_dgram - pull in packet label | |
2655 | * @sock: the socket | |
2656 | * @skb: packet data | |
2657 | * @secid: pointer to where to put the secid of the packet | |
2658 | * | |
2659 | * Sets the netlabel socket state on sk from parent | |
2660 | */ | |
2661 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2662 | struct sk_buff *skb, u32 *secid) | |
2663 | ||
2664 | { | |
2665 | struct netlbl_lsm_secattr secattr; | |
2666 | struct sock *sk; | |
2667 | char smack[SMK_LABELLEN]; | |
2668 | int family = PF_INET; | |
2669 | u32 s; | |
2670 | int rc; | |
2671 | ||
2672 | /* | |
2673 | * Only works for families with packets. | |
2674 | */ | |
2675 | if (sock != NULL) { | |
2676 | sk = sock->sk; | |
2677 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2678 | return 0; | |
2679 | family = sk->sk_family; | |
2680 | } | |
2681 | /* | |
2682 | * Translate what netlabel gave us. | |
2683 | */ | |
e114e473 CS |
2684 | netlbl_secattr_init(&secattr); |
2685 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2686 | if (rc == 0) | |
2687 | smack_from_secattr(&secattr, smack); | |
2688 | netlbl_secattr_destroy(&secattr); | |
2689 | ||
2690 | /* | |
2691 | * Give up if we couldn't get anything | |
2692 | */ | |
2693 | if (rc != 0) | |
2694 | return rc; | |
2695 | ||
2696 | s = smack_to_secid(smack); | |
2697 | if (s == 0) | |
2698 | return -EINVAL; | |
2699 | ||
2700 | *secid = s; | |
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | /** | |
07feee8f PM |
2705 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2706 | * @sk: child sock | |
2707 | * @parent: parent socket | |
e114e473 | 2708 | * |
07feee8f PM |
2709 | * Set the smk_{in,out} state of an existing sock based on the process that |
2710 | * is creating the new socket. | |
e114e473 CS |
2711 | */ |
2712 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2713 | { | |
2714 | struct socket_smack *ssp; | |
e114e473 | 2715 | |
07feee8f PM |
2716 | if (sk == NULL || |
2717 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
2718 | return; |
2719 | ||
2720 | ssp = sk->sk_security; | |
86a264ab | 2721 | ssp->smk_in = ssp->smk_out = current_security(); |
07feee8f | 2722 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
2723 | } |
2724 | ||
2725 | /** | |
2726 | * smack_inet_conn_request - Smack access check on connect | |
2727 | * @sk: socket involved | |
2728 | * @skb: packet | |
2729 | * @req: unused | |
2730 | * | |
2731 | * Returns 0 if a task with the packet label could write to | |
2732 | * the socket, otherwise an error code | |
2733 | */ | |
2734 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2735 | struct request_sock *req) | |
2736 | { | |
07feee8f | 2737 | u16 family = sk->sk_family; |
e114e473 | 2738 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
2739 | struct netlbl_lsm_secattr secattr; |
2740 | struct sockaddr_in addr; | |
2741 | struct iphdr *hdr; | |
e114e473 CS |
2742 | char smack[SMK_LABELLEN]; |
2743 | int rc; | |
ecfcc53f | 2744 | struct smk_audit_info ad; |
e114e473 | 2745 | |
07feee8f PM |
2746 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2747 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
2748 | family = PF_INET; | |
e114e473 | 2749 | |
07feee8f PM |
2750 | netlbl_secattr_init(&secattr); |
2751 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 2752 | if (rc == 0) |
07feee8f | 2753 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
2754 | else |
2755 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
2756 | netlbl_secattr_destroy(&secattr); |
2757 | ||
ecfcc53f EB |
2758 | #ifdef CONFIG_AUDIT |
2759 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2760 | ad.a.u.net.family = family; | |
8964be4a | 2761 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2762 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2763 | #endif | |
e114e473 | 2764 | /* |
07feee8f PM |
2765 | * Receiving a packet requires that the other end be able to write |
2766 | * here. Read access is not required. | |
e114e473 | 2767 | */ |
ecfcc53f | 2768 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
2769 | if (rc != 0) |
2770 | return rc; | |
2771 | ||
2772 | /* | |
2773 | * Save the peer's label in the request_sock so we can later setup | |
2774 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
2775 | */ | |
2776 | req->peer_secid = smack_to_secid(smack); | |
2777 | ||
2778 | /* | |
2779 | * We need to decide if we want to label the incoming connection here | |
2780 | * if we do we only need to label the request_sock and the stack will | |
2781 | * propogate the wire-label to the sock when it is created. | |
2782 | */ | |
2783 | hdr = ip_hdr(skb); | |
2784 | addr.sin_addr.s_addr = hdr->saddr; | |
2785 | rcu_read_lock(); | |
2786 | if (smack_host_label(&addr) == NULL) { | |
2787 | rcu_read_unlock(); | |
2788 | netlbl_secattr_init(&secattr); | |
2789 | smack_to_secattr(smack, &secattr); | |
2790 | rc = netlbl_req_setattr(req, &secattr); | |
2791 | netlbl_secattr_destroy(&secattr); | |
2792 | } else { | |
2793 | rcu_read_unlock(); | |
2794 | netlbl_req_delattr(req); | |
2795 | } | |
e114e473 CS |
2796 | |
2797 | return rc; | |
2798 | } | |
2799 | ||
07feee8f PM |
2800 | /** |
2801 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
2802 | * @sk: the new socket | |
2803 | * @req: the connection's request_sock | |
2804 | * | |
2805 | * Transfer the connection's peer label to the newly created socket. | |
2806 | */ | |
2807 | static void smack_inet_csk_clone(struct sock *sk, | |
2808 | const struct request_sock *req) | |
2809 | { | |
2810 | struct socket_smack *ssp = sk->sk_security; | |
2811 | char *smack; | |
2812 | ||
2813 | if (req->peer_secid != 0) { | |
2814 | smack = smack_from_secid(req->peer_secid); | |
2815 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2816 | } else | |
2817 | ssp->smk_packet[0] = '\0'; | |
2818 | } | |
2819 | ||
e114e473 CS |
2820 | /* |
2821 | * Key management security hooks | |
2822 | * | |
2823 | * Casey has not tested key support very heavily. | |
2824 | * The permission check is most likely too restrictive. | |
2825 | * If you care about keys please have a look. | |
2826 | */ | |
2827 | #ifdef CONFIG_KEYS | |
2828 | ||
2829 | /** | |
2830 | * smack_key_alloc - Set the key security blob | |
2831 | * @key: object | |
d84f4f99 | 2832 | * @cred: the credentials to use |
e114e473 CS |
2833 | * @flags: unused |
2834 | * | |
2835 | * No allocation required | |
2836 | * | |
2837 | * Returns 0 | |
2838 | */ | |
d84f4f99 | 2839 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
2840 | unsigned long flags) |
2841 | { | |
d84f4f99 | 2842 | key->security = cred->security; |
e114e473 CS |
2843 | return 0; |
2844 | } | |
2845 | ||
2846 | /** | |
2847 | * smack_key_free - Clear the key security blob | |
2848 | * @key: the object | |
2849 | * | |
2850 | * Clear the blob pointer | |
2851 | */ | |
2852 | static void smack_key_free(struct key *key) | |
2853 | { | |
2854 | key->security = NULL; | |
2855 | } | |
2856 | ||
2857 | /* | |
2858 | * smack_key_permission - Smack access on a key | |
2859 | * @key_ref: gets to the object | |
d84f4f99 | 2860 | * @cred: the credentials to use |
e114e473 CS |
2861 | * @perm: unused |
2862 | * | |
2863 | * Return 0 if the task has read and write to the object, | |
2864 | * an error code otherwise | |
2865 | */ | |
2866 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 2867 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
2868 | { |
2869 | struct key *keyp; | |
ecfcc53f | 2870 | struct smk_audit_info ad; |
e114e473 CS |
2871 | |
2872 | keyp = key_ref_to_ptr(key_ref); | |
2873 | if (keyp == NULL) | |
2874 | return -EINVAL; | |
2875 | /* | |
2876 | * If the key hasn't been initialized give it access so that | |
2877 | * it may do so. | |
2878 | */ | |
2879 | if (keyp->security == NULL) | |
2880 | return 0; | |
2881 | /* | |
2882 | * This should not occur | |
2883 | */ | |
d84f4f99 | 2884 | if (cred->security == NULL) |
e114e473 | 2885 | return -EACCES; |
ecfcc53f EB |
2886 | #ifdef CONFIG_AUDIT |
2887 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
2888 | ad.a.u.key_struct.key = keyp->serial; | |
2889 | ad.a.u.key_struct.key_desc = keyp->description; | |
2890 | #endif | |
2891 | return smk_access(cred->security, keyp->security, | |
2892 | MAY_READWRITE, &ad); | |
e114e473 CS |
2893 | } |
2894 | #endif /* CONFIG_KEYS */ | |
2895 | ||
d20bdda6 AD |
2896 | /* |
2897 | * Smack Audit hooks | |
2898 | * | |
2899 | * Audit requires a unique representation of each Smack specific | |
2900 | * rule. This unique representation is used to distinguish the | |
2901 | * object to be audited from remaining kernel objects and also | |
2902 | * works as a glue between the audit hooks. | |
2903 | * | |
2904 | * Since repository entries are added but never deleted, we'll use | |
2905 | * the smack_known label address related to the given audit rule as | |
2906 | * the needed unique representation. This also better fits the smack | |
2907 | * model where nearly everything is a label. | |
2908 | */ | |
2909 | #ifdef CONFIG_AUDIT | |
2910 | ||
2911 | /** | |
2912 | * smack_audit_rule_init - Initialize a smack audit rule | |
2913 | * @field: audit rule fields given from user-space (audit.h) | |
2914 | * @op: required testing operator (=, !=, >, <, ...) | |
2915 | * @rulestr: smack label to be audited | |
2916 | * @vrule: pointer to save our own audit rule representation | |
2917 | * | |
2918 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2919 | * The label to be audited is created if necessay. | |
2920 | */ | |
2921 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2922 | { | |
2923 | char **rule = (char **)vrule; | |
2924 | *rule = NULL; | |
2925 | ||
2926 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2927 | return -EINVAL; | |
2928 | ||
5af75d8d | 2929 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
2930 | return -EINVAL; |
2931 | ||
2932 | *rule = smk_import(rulestr, 0); | |
2933 | ||
2934 | return 0; | |
2935 | } | |
2936 | ||
2937 | /** | |
2938 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2939 | * @krule: rule of interest, in Audit kernel representation format | |
2940 | * | |
2941 | * This is used to filter Smack rules from remaining Audit ones. | |
2942 | * If it's proved that this rule belongs to us, the | |
2943 | * audit_rule_match hook will be called to do the final judgement. | |
2944 | */ | |
2945 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2946 | { | |
2947 | struct audit_field *f; | |
2948 | int i; | |
2949 | ||
2950 | for (i = 0; i < krule->field_count; i++) { | |
2951 | f = &krule->fields[i]; | |
2952 | ||
2953 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2954 | return 1; | |
2955 | } | |
2956 | ||
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | /** | |
2961 | * smack_audit_rule_match - Audit given object ? | |
2962 | * @secid: security id for identifying the object to test | |
2963 | * @field: audit rule flags given from user-space | |
2964 | * @op: required testing operator | |
2965 | * @vrule: smack internal rule presentation | |
2966 | * @actx: audit context associated with the check | |
2967 | * | |
2968 | * The core Audit hook. It's used to take the decision of | |
2969 | * whether to audit or not to audit a given object. | |
2970 | */ | |
2971 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2972 | struct audit_context *actx) | |
2973 | { | |
2974 | char *smack; | |
2975 | char *rule = vrule; | |
2976 | ||
2977 | if (!rule) { | |
2978 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2979 | "Smack: missing rule\n"); | |
2980 | return -ENOENT; | |
2981 | } | |
2982 | ||
2983 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2984 | return 0; | |
2985 | ||
2986 | smack = smack_from_secid(secid); | |
2987 | ||
2988 | /* | |
2989 | * No need to do string comparisons. If a match occurs, | |
2990 | * both pointers will point to the same smack_known | |
2991 | * label. | |
2992 | */ | |
5af75d8d | 2993 | if (op == Audit_equal) |
d20bdda6 | 2994 | return (rule == smack); |
5af75d8d | 2995 | if (op == Audit_not_equal) |
d20bdda6 AD |
2996 | return (rule != smack); |
2997 | ||
2998 | return 0; | |
2999 | } | |
3000 | ||
3001 | /** | |
3002 | * smack_audit_rule_free - free smack rule representation | |
3003 | * @vrule: rule to be freed. | |
3004 | * | |
3005 | * No memory was allocated. | |
3006 | */ | |
3007 | static void smack_audit_rule_free(void *vrule) | |
3008 | { | |
3009 | /* No-op */ | |
3010 | } | |
3011 | ||
3012 | #endif /* CONFIG_AUDIT */ | |
3013 | ||
251a2a95 | 3014 | /** |
e114e473 CS |
3015 | * smack_secid_to_secctx - return the smack label for a secid |
3016 | * @secid: incoming integer | |
3017 | * @secdata: destination | |
3018 | * @seclen: how long it is | |
3019 | * | |
3020 | * Exists for networking code. | |
3021 | */ | |
3022 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3023 | { | |
3024 | char *sp = smack_from_secid(secid); | |
3025 | ||
3026 | *secdata = sp; | |
3027 | *seclen = strlen(sp); | |
3028 | return 0; | |
3029 | } | |
3030 | ||
251a2a95 | 3031 | /** |
4bc87e62 CS |
3032 | * smack_secctx_to_secid - return the secid for a smack label |
3033 | * @secdata: smack label | |
3034 | * @seclen: how long result is | |
3035 | * @secid: outgoing integer | |
3036 | * | |
3037 | * Exists for audit and networking code. | |
3038 | */ | |
e52c1764 | 3039 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3040 | { |
3041 | *secid = smack_to_secid(secdata); | |
3042 | return 0; | |
3043 | } | |
3044 | ||
251a2a95 | 3045 | /** |
e114e473 | 3046 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3047 | * @secdata: unused |
3048 | * @seclen: unused | |
e114e473 CS |
3049 | * |
3050 | * Exists to make sure nothing gets done, and properly | |
3051 | */ | |
3052 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3053 | { | |
3054 | } | |
3055 | ||
1ee65e37 DQ |
3056 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3057 | { | |
3058 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3059 | } | |
3060 | ||
3061 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3062 | { | |
3063 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3064 | } | |
3065 | ||
3066 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3067 | { | |
3068 | int len = 0; | |
3069 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3070 | ||
3071 | if (len < 0) | |
3072 | return len; | |
3073 | *ctxlen = len; | |
3074 | return 0; | |
3075 | } | |
3076 | ||
076c54c5 AD |
3077 | struct security_operations smack_ops = { |
3078 | .name = "smack", | |
3079 | ||
9e48858f | 3080 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3081 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3082 | .syslog = smack_syslog, |
e114e473 CS |
3083 | |
3084 | .sb_alloc_security = smack_sb_alloc_security, | |
3085 | .sb_free_security = smack_sb_free_security, | |
3086 | .sb_copy_data = smack_sb_copy_data, | |
3087 | .sb_kern_mount = smack_sb_kern_mount, | |
3088 | .sb_statfs = smack_sb_statfs, | |
3089 | .sb_mount = smack_sb_mount, | |
3090 | .sb_umount = smack_sb_umount, | |
3091 | ||
3092 | .inode_alloc_security = smack_inode_alloc_security, | |
3093 | .inode_free_security = smack_inode_free_security, | |
3094 | .inode_init_security = smack_inode_init_security, | |
3095 | .inode_link = smack_inode_link, | |
3096 | .inode_unlink = smack_inode_unlink, | |
3097 | .inode_rmdir = smack_inode_rmdir, | |
3098 | .inode_rename = smack_inode_rename, | |
3099 | .inode_permission = smack_inode_permission, | |
3100 | .inode_setattr = smack_inode_setattr, | |
3101 | .inode_getattr = smack_inode_getattr, | |
3102 | .inode_setxattr = smack_inode_setxattr, | |
3103 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3104 | .inode_getxattr = smack_inode_getxattr, | |
3105 | .inode_removexattr = smack_inode_removexattr, | |
3106 | .inode_getsecurity = smack_inode_getsecurity, | |
3107 | .inode_setsecurity = smack_inode_setsecurity, | |
3108 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3109 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3110 | |
3111 | .file_permission = smack_file_permission, | |
3112 | .file_alloc_security = smack_file_alloc_security, | |
3113 | .file_free_security = smack_file_free_security, | |
3114 | .file_ioctl = smack_file_ioctl, | |
3115 | .file_lock = smack_file_lock, | |
3116 | .file_fcntl = smack_file_fcntl, | |
3117 | .file_set_fowner = smack_file_set_fowner, | |
3118 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3119 | .file_receive = smack_file_receive, | |
3120 | ||
ee18d64c | 3121 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3122 | .cred_free = smack_cred_free, |
d84f4f99 DH |
3123 | .cred_prepare = smack_cred_prepare, |
3124 | .cred_commit = smack_cred_commit, | |
ee18d64c | 3125 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3126 | .kernel_act_as = smack_kernel_act_as, |
3127 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3128 | .task_setpgid = smack_task_setpgid, |
3129 | .task_getpgid = smack_task_getpgid, | |
3130 | .task_getsid = smack_task_getsid, | |
3131 | .task_getsecid = smack_task_getsecid, | |
3132 | .task_setnice = smack_task_setnice, | |
3133 | .task_setioprio = smack_task_setioprio, | |
3134 | .task_getioprio = smack_task_getioprio, | |
3135 | .task_setscheduler = smack_task_setscheduler, | |
3136 | .task_getscheduler = smack_task_getscheduler, | |
3137 | .task_movememory = smack_task_movememory, | |
3138 | .task_kill = smack_task_kill, | |
3139 | .task_wait = smack_task_wait, | |
e114e473 CS |
3140 | .task_to_inode = smack_task_to_inode, |
3141 | ||
3142 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3143 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3144 | |
3145 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3146 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3147 | ||
3148 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3149 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3150 | .msg_queue_associate = smack_msg_queue_associate, | |
3151 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3152 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3153 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3154 | ||
3155 | .shm_alloc_security = smack_shm_alloc_security, | |
3156 | .shm_free_security = smack_shm_free_security, | |
3157 | .shm_associate = smack_shm_associate, | |
3158 | .shm_shmctl = smack_shm_shmctl, | |
3159 | .shm_shmat = smack_shm_shmat, | |
3160 | ||
3161 | .sem_alloc_security = smack_sem_alloc_security, | |
3162 | .sem_free_security = smack_sem_free_security, | |
3163 | .sem_associate = smack_sem_associate, | |
3164 | .sem_semctl = smack_sem_semctl, | |
3165 | .sem_semop = smack_sem_semop, | |
3166 | ||
e114e473 CS |
3167 | .d_instantiate = smack_d_instantiate, |
3168 | ||
3169 | .getprocattr = smack_getprocattr, | |
3170 | .setprocattr = smack_setprocattr, | |
3171 | ||
3172 | .unix_stream_connect = smack_unix_stream_connect, | |
3173 | .unix_may_send = smack_unix_may_send, | |
3174 | ||
3175 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3176 | .socket_connect = smack_socket_connect, |
3177 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3178 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3179 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3180 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3181 | .sk_alloc_security = smack_sk_alloc_security, | |
3182 | .sk_free_security = smack_sk_free_security, | |
3183 | .sock_graft = smack_sock_graft, | |
3184 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3185 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3186 | |
e114e473 CS |
3187 | /* key management security hooks */ |
3188 | #ifdef CONFIG_KEYS | |
3189 | .key_alloc = smack_key_alloc, | |
3190 | .key_free = smack_key_free, | |
3191 | .key_permission = smack_key_permission, | |
3192 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3193 | |
3194 | /* Audit hooks */ | |
3195 | #ifdef CONFIG_AUDIT | |
3196 | .audit_rule_init = smack_audit_rule_init, | |
3197 | .audit_rule_known = smack_audit_rule_known, | |
3198 | .audit_rule_match = smack_audit_rule_match, | |
3199 | .audit_rule_free = smack_audit_rule_free, | |
3200 | #endif /* CONFIG_AUDIT */ | |
3201 | ||
e114e473 | 3202 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3203 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3204 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3205 | .inode_notifysecctx = smack_inode_notifysecctx, |
3206 | .inode_setsecctx = smack_inode_setsecctx, | |
3207 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3208 | }; |
3209 | ||
7198e2ee EB |
3210 | |
3211 | static __init void init_smack_know_list(void) | |
3212 | { | |
3213 | list_add(&smack_known_huh.list, &smack_known_list); | |
3214 | list_add(&smack_known_hat.list, &smack_known_list); | |
3215 | list_add(&smack_known_star.list, &smack_known_list); | |
3216 | list_add(&smack_known_floor.list, &smack_known_list); | |
3217 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3218 | list_add(&smack_known_web.list, &smack_known_list); | |
3219 | } | |
3220 | ||
e114e473 CS |
3221 | /** |
3222 | * smack_init - initialize the smack system | |
3223 | * | |
3224 | * Returns 0 | |
3225 | */ | |
3226 | static __init int smack_init(void) | |
3227 | { | |
d84f4f99 DH |
3228 | struct cred *cred; |
3229 | ||
076c54c5 AD |
3230 | if (!security_module_enable(&smack_ops)) |
3231 | return 0; | |
3232 | ||
e114e473 CS |
3233 | printk(KERN_INFO "Smack: Initializing.\n"); |
3234 | ||
3235 | /* | |
3236 | * Set the security state for the initial task. | |
3237 | */ | |
d84f4f99 DH |
3238 | cred = (struct cred *) current->cred; |
3239 | cred->security = &smack_known_floor.smk_known; | |
e114e473 | 3240 | |
7198e2ee EB |
3241 | /* initilize the smack_know_list */ |
3242 | init_smack_know_list(); | |
e114e473 CS |
3243 | /* |
3244 | * Initialize locks | |
3245 | */ | |
e114e473 CS |
3246 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3247 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3248 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3249 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3250 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3251 | ||
3252 | /* | |
3253 | * Register with LSM | |
3254 | */ | |
3255 | if (register_security(&smack_ops)) | |
3256 | panic("smack: Unable to register with kernel.\n"); | |
3257 | ||
3258 | return 0; | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * Smack requires early initialization in order to label | |
3263 | * all processes and objects when they are created. | |
3264 | */ | |
3265 | security_initcall(smack_init); |