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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> |
10 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
11 | * Paul Moore <paul.moore@hp.com> |
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/kd.h> |
23 | #include <asm/ioctls.h> |
24 | #include <linux/ip.h> |
25 | #include <linux/tcp.h> |
26 | #include <linux/udp.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/mutex.h> |
29 | #include <linux/pipe_fs_i.h> |
30 | #include <net/netlabel.h> |
31 | #include <net/cipso_ipv4.h> |
32 | #include <linux/audit.h> |
33 | #include <linux/magic.h> |
34 | #include "smack.h" |
35 | |
36 | #define task_security(task) (task_cred_xxx((task), security)) |
37 | |
38 | /** |
39 | * smk_fetch - Fetch the smack label from a file. |
40 | * @ip: a pointer to the inode |
41 | * @dp: a pointer to the dentry |
42 | * |
43 | * Returns a pointer to the master list entry for the Smack label |
44 | * or NULL if there was no label to fetch. |
45 | */ |
46 | static char *smk_fetch(struct inode *ip, struct dentry *dp) |
47 | { |
48 | int rc; |
49 | char in[SMK_LABELLEN]; |
50 | |
51 | if (ip->i_op->getxattr == NULL) |
52 | return NULL; |
53 | |
54 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); |
55 | if (rc < 0) |
56 | return NULL; |
57 | |
58 | return smk_import(in, rc); |
59 | } |
60 | |
61 | /** |
62 | * new_inode_smack - allocate an inode security blob |
63 | * @smack: a pointer to the Smack label to use in the blob |
64 | * |
65 | * Returns the new blob or NULL if there's no memory available |
66 | */ |
67 | struct inode_smack *new_inode_smack(char *smack) |
68 | { |
69 | struct inode_smack *isp; |
70 | |
71 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); |
72 | if (isp == NULL) |
73 | return NULL; |
74 | |
75 | isp->smk_inode = smack; |
76 | isp->smk_flags = 0; |
77 | mutex_init(&isp->smk_lock); |
78 | |
79 | return isp; |
80 | } |
81 | |
82 | /* |
83 | * LSM hooks. |
84 | * We he, that is fun! |
85 | */ |
86 | |
87 | /** |
88 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
89 | * @ctp: child task pointer |
90 | * @mode: ptrace attachment mode |
91 | * |
92 | * Returns 0 if access is OK, an error code otherwise |
93 | * |
94 | * Do the capability checks, and require read and write. |
95 | */ |
96 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
97 | { |
98 | int rc; |
99 | struct smk_audit_info ad; |
100 | char *sp, *tsp; |
101 | |
102 | rc = cap_ptrace_access_check(ctp, mode); |
103 | if (rc != 0) |
104 | return rc; |
105 | |
106 | sp = current_security(); |
107 | tsp = task_security(ctp); |
108 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
109 | smk_ad_setfield_u_tsk(&ad, ctp); |
110 | |
111 | /* we won't log here, because rc can be overriden */ |
112 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); |
113 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
114 | rc = 0; |
115 | |
116 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); |
117 | return rc; |
118 | } |
119 | |
120 | /** |
121 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME |
122 | * @ptp: parent task pointer |
123 | * |
124 | * Returns 0 if access is OK, an error code otherwise |
125 | * |
126 | * Do the capability checks, and require read and write. |
127 | */ |
128 | static int smack_ptrace_traceme(struct task_struct *ptp) |
129 | { |
130 | int rc; |
131 | struct smk_audit_info ad; |
132 | char *sp, *tsp; |
133 | |
134 | rc = cap_ptrace_traceme(ptp); |
135 | if (rc != 0) |
136 | return rc; |
137 | |
138 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
139 | smk_ad_setfield_u_tsk(&ad, ptp); |
140 | |
141 | sp = current_security(); |
142 | tsp = task_security(ptp); |
143 | /* we won't log here, because rc can be overriden */ |
144 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); |
145 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
146 | rc = 0; |
147 | |
148 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); |
149 | return rc; |
150 | } |
151 | |
152 | /** |
153 | * smack_syslog - Smack approval on syslog |
154 | * @type: message type |
155 | * |
156 | * Require that the task has the floor label |
157 | * |
158 | * Returns 0 on success, error code otherwise. |
159 | */ |
160 | static int smack_syslog(int typefrom_file) |
161 | { |
162 | int rc = 0; |
163 | char *sp = current_security(); |
164 | |
165 | if (capable(CAP_MAC_OVERRIDE)) |
166 | return 0; |
167 | |
168 | if (sp != smack_known_floor.smk_known) |
169 | rc = -EACCES; |
170 | |
171 | return rc; |
172 | } |
173 | |
174 | |
175 | /* |
176 | * Superblock Hooks. |
177 | */ |
178 | |
179 | /** |
180 | * smack_sb_alloc_security - allocate a superblock blob |
181 | * @sb: the superblock getting the blob |
182 | * |
183 | * Returns 0 on success or -ENOMEM on error. |
184 | */ |
185 | static int smack_sb_alloc_security(struct super_block *sb) |
186 | { |
187 | struct superblock_smack *sbsp; |
188 | |
189 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); |
190 | |
191 | if (sbsp == NULL) |
192 | return -ENOMEM; |
193 | |
194 | sbsp->smk_root = smack_known_floor.smk_known; |
195 | sbsp->smk_default = smack_known_floor.smk_known; |
196 | sbsp->smk_floor = smack_known_floor.smk_known; |
197 | sbsp->smk_hat = smack_known_hat.smk_known; |
198 | sbsp->smk_initialized = 0; |
199 | spin_lock_init(&sbsp->smk_sblock); |
200 | |
201 | sb->s_security = sbsp; |
202 | |
203 | return 0; |
204 | } |
205 | |
206 | /** |
207 | * smack_sb_free_security - free a superblock blob |
208 | * @sb: the superblock getting the blob |
209 | * |
210 | */ |
211 | static void smack_sb_free_security(struct super_block *sb) |
212 | { |
213 | kfree(sb->s_security); |
214 | sb->s_security = NULL; |
215 | } |
216 | |
217 | /** |
218 | * smack_sb_copy_data - copy mount options data for processing |
219 | * @orig: where to start |
220 | * @smackopts: mount options string |
221 | * |
222 | * Returns 0 on success or -ENOMEM on error. |
223 | * |
224 | * Copy the Smack specific mount options out of the mount |
225 | * options list. |
226 | */ |
227 | static int smack_sb_copy_data(char *orig, char *smackopts) |
228 | { |
229 | char *cp, *commap, *otheropts, *dp; |
230 | |
231 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
232 | if (otheropts == NULL) |
233 | return -ENOMEM; |
234 | |
235 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { |
236 | if (strstr(cp, SMK_FSDEFAULT) == cp) |
237 | dp = smackopts; |
238 | else if (strstr(cp, SMK_FSFLOOR) == cp) |
239 | dp = smackopts; |
240 | else if (strstr(cp, SMK_FSHAT) == cp) |
241 | dp = smackopts; |
242 | else if (strstr(cp, SMK_FSROOT) == cp) |
243 | dp = smackopts; |
244 | else |
245 | dp = otheropts; |
246 | |
247 | commap = strchr(cp, ','); |
248 | if (commap != NULL) |
249 | *commap = '\0'; |
250 | |
251 | if (*dp != '\0') |
252 | strcat(dp, ","); |
253 | strcat(dp, cp); |
254 | } |
255 | |
256 | strcpy(orig, otheropts); |
257 | free_page((unsigned long)otheropts); |
258 | |
259 | return 0; |
260 | } |
261 | |
262 | /** |
263 | * smack_sb_kern_mount - Smack specific mount processing |
264 | * @sb: the file system superblock |
265 | * @flags: the mount flags |
266 | * @data: the smack mount options |
267 | * |
268 | * Returns 0 on success, an error code on failure |
269 | */ |
270 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
271 | { |
272 | struct dentry *root = sb->s_root; |
273 | struct inode *inode = root->d_inode; |
274 | struct superblock_smack *sp = sb->s_security; |
275 | struct inode_smack *isp; |
276 | char *op; |
277 | char *commap; |
278 | char *nsp; |
279 | |
280 | spin_lock(&sp->smk_sblock); |
281 | if (sp->smk_initialized != 0) { |
282 | spin_unlock(&sp->smk_sblock); |
283 | return 0; |
284 | } |
285 | sp->smk_initialized = 1; |
286 | spin_unlock(&sp->smk_sblock); |
287 | |
288 | for (op = data; op != NULL; op = commap) { |
289 | commap = strchr(op, ','); |
290 | if (commap != NULL) |
291 | *commap++ = '\0'; |
292 | |
293 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { |
294 | op += strlen(SMK_FSHAT); |
295 | nsp = smk_import(op, 0); |
296 | if (nsp != NULL) |
297 | sp->smk_hat = nsp; |
298 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
299 | op += strlen(SMK_FSFLOOR); |
300 | nsp = smk_import(op, 0); |
301 | if (nsp != NULL) |
302 | sp->smk_floor = nsp; |
303 | } else if (strncmp(op, SMK_FSDEFAULT, |
304 | strlen(SMK_FSDEFAULT)) == 0) { |
305 | op += strlen(SMK_FSDEFAULT); |
306 | nsp = smk_import(op, 0); |
307 | if (nsp != NULL) |
308 | sp->smk_default = nsp; |
309 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
310 | op += strlen(SMK_FSROOT); |
311 | nsp = smk_import(op, 0); |
312 | if (nsp != NULL) |
313 | sp->smk_root = nsp; |
314 | } |
315 | } |
316 | |
317 | /* |
318 | * Initialize the root inode. |
319 | */ |
320 | isp = inode->i_security; |
321 | if (isp == NULL) |
322 | inode->i_security = new_inode_smack(sp->smk_root); |
323 | else |
324 | isp->smk_inode = sp->smk_root; |
325 | |
326 | return 0; |
327 | } |
328 | |
329 | /** |
330 | * smack_sb_statfs - Smack check on statfs |
331 | * @dentry: identifies the file system in question |
332 | * |
333 | * Returns 0 if current can read the floor of the filesystem, |
334 | * and error code otherwise |
335 | */ |
336 | static int smack_sb_statfs(struct dentry *dentry) |
337 | { |
338 | struct superblock_smack *sbp = dentry->d_sb->s_security; |
339 | int rc; |
340 | struct smk_audit_info ad; |
341 | |
342 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
343 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
344 | |
345 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
346 | return rc; |
347 | } |
348 | |
349 | /** |
350 | * smack_sb_mount - Smack check for mounting |
351 | * @dev_name: unused |
352 | * @path: mount point |
353 | * @type: unused |
354 | * @flags: unused |
355 | * @data: unused |
356 | * |
357 | * Returns 0 if current can write the floor of the filesystem |
358 | * being mounted on, an error code otherwise. |
359 | */ |
360 | static int smack_sb_mount(char *dev_name, struct path *path, |
361 | char *type, unsigned long flags, void *data) |
362 | { |
363 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
364 | struct smk_audit_info ad; |
365 | |
366 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
367 | smk_ad_setfield_u_fs_path(&ad, *path); |
368 | |
369 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
370 | } |
371 | |
372 | /** |
373 | * smack_sb_umount - Smack check for unmounting |
374 | * @mnt: file system to unmount |
375 | * @flags: unused |
376 | * |
377 | * Returns 0 if current can write the floor of the filesystem |
378 | * being unmounted, an error code otherwise. |
379 | */ |
380 | static int smack_sb_umount(struct vfsmount *mnt, int flags) |
381 | { |
382 | struct superblock_smack *sbp; |
383 | struct smk_audit_info ad; |
384 | |
385 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
386 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); |
387 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
388 | |
389 | sbp = mnt->mnt_sb->s_security; |
390 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); |
391 | } |
392 | |
393 | /* |
394 | * Inode hooks |
395 | */ |
396 | |
397 | /** |
398 | * smack_inode_alloc_security - allocate an inode blob |
399 | * @inode: the inode in need of a blob |
400 | * |
401 | * Returns 0 if it gets a blob, -ENOMEM otherwise |
402 | */ |
403 | static int smack_inode_alloc_security(struct inode *inode) |
404 | { |
405 | inode->i_security = new_inode_smack(current_security()); |
406 | if (inode->i_security == NULL) |
407 | return -ENOMEM; |
408 | return 0; |
409 | } |
410 | |
411 | /** |
412 | * smack_inode_free_security - free an inode blob |
413 | * @inode: the inode with a blob |
414 | * |
415 | * Clears the blob pointer in inode |
416 | */ |
417 | static void smack_inode_free_security(struct inode *inode) |
418 | { |
419 | kfree(inode->i_security); |
420 | inode->i_security = NULL; |
421 | } |
422 | |
423 | /** |
424 | * smack_inode_init_security - copy out the smack from an inode |
425 | * @inode: the inode |
426 | * @dir: unused |
427 | * @name: where to put the attribute name |
428 | * @value: where to put the attribute value |
429 | * @len: where to put the length of the attribute |
430 | * |
431 | * Returns 0 if it all works out, -ENOMEM if there's no memory |
432 | */ |
433 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, |
434 | char **name, void **value, size_t *len) |
435 | { |
436 | char *isp = smk_of_inode(inode); |
437 | |
438 | if (name) { |
439 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); |
440 | if (*name == NULL) |
441 | return -ENOMEM; |
442 | } |
443 | |
444 | if (value) { |
445 | *value = kstrdup(isp, GFP_KERNEL); |
446 | if (*value == NULL) |
447 | return -ENOMEM; |
448 | } |
449 | |
450 | if (len) |
451 | *len = strlen(isp) + 1; |
452 | |
453 | return 0; |
454 | } |
455 | |
456 | /** |
457 | * smack_inode_link - Smack check on link |
458 | * @old_dentry: the existing object |
459 | * @dir: unused |
460 | * @new_dentry: the new object |
461 | * |
462 | * Returns 0 if access is permitted, an error code otherwise |
463 | */ |
464 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, |
465 | struct dentry *new_dentry) |
466 | { |
467 | char *isp; |
468 | struct smk_audit_info ad; |
469 | int rc; |
470 | |
471 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
472 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
473 | |
474 | isp = smk_of_inode(old_dentry->d_inode); |
475 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
476 | |
477 | if (rc == 0 && new_dentry->d_inode != NULL) { |
478 | isp = smk_of_inode(new_dentry->d_inode); |
479 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
480 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
481 | } |
482 | |
483 | return rc; |
484 | } |
485 | |
486 | /** |
487 | * smack_inode_unlink - Smack check on inode deletion |
488 | * @dir: containing directory object |
489 | * @dentry: file to unlink |
490 | * |
491 | * Returns 0 if current can write the containing directory |
492 | * and the object, error code otherwise |
493 | */ |
494 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) |
495 | { |
496 | struct inode *ip = dentry->d_inode; |
497 | struct smk_audit_info ad; |
498 | int rc; |
499 | |
500 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
501 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
502 | |
503 | /* |
504 | * You need write access to the thing you're unlinking |
505 | */ |
506 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
507 | if (rc == 0) { |
508 | /* |
509 | * You also need write access to the containing directory |
510 | */ |
511 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
512 | smk_ad_setfield_u_fs_inode(&ad, dir); |
513 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); |
514 | } |
515 | return rc; |
516 | } |
517 | |
518 | /** |
519 | * smack_inode_rmdir - Smack check on directory deletion |
520 | * @dir: containing directory object |
521 | * @dentry: directory to unlink |
522 | * |
523 | * Returns 0 if current can write the containing directory |
524 | * and the directory, error code otherwise |
525 | */ |
526 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) |
527 | { |
528 | struct smk_audit_info ad; |
529 | int rc; |
530 | |
531 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
532 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
533 | |
534 | /* |
535 | * You need write access to the thing you're removing |
536 | */ |
537 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
538 | if (rc == 0) { |
539 | /* |
540 | * You also need write access to the containing directory |
541 | */ |
542 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
543 | smk_ad_setfield_u_fs_inode(&ad, dir); |
544 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); |
545 | } |
546 | |
547 | return rc; |
548 | } |
549 | |
550 | /** |
551 | * smack_inode_rename - Smack check on rename |
552 | * @old_inode: the old directory |
553 | * @old_dentry: unused |
554 | * @new_inode: the new directory |
555 | * @new_dentry: unused |
556 | * |
557 | * Read and write access is required on both the old and |
558 | * new directories. |
559 | * |
560 | * Returns 0 if access is permitted, an error code otherwise |
561 | */ |
562 | static int smack_inode_rename(struct inode *old_inode, |
563 | struct dentry *old_dentry, |
564 | struct inode *new_inode, |
565 | struct dentry *new_dentry) |
566 | { |
567 | int rc; |
568 | char *isp; |
569 | struct smk_audit_info ad; |
570 | |
571 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
572 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
573 | |
574 | isp = smk_of_inode(old_dentry->d_inode); |
575 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
576 | |
577 | if (rc == 0 && new_dentry->d_inode != NULL) { |
578 | isp = smk_of_inode(new_dentry->d_inode); |
579 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
580 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
581 | } |
582 | return rc; |
583 | } |
584 | |
585 | /** |
586 | * smack_inode_permission - Smack version of permission() |
587 | * @inode: the inode in question |
588 | * @mask: the access requested |
589 | * |
590 | * This is the important Smack hook. |
591 | * |
592 | * Returns 0 if access is permitted, -EACCES otherwise |
593 | */ |
594 | static int smack_inode_permission(struct inode *inode, int mask) |
595 | { |
596 | struct smk_audit_info ad; |
597 | |
598 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); |
599 | /* |
600 | * No permission to check. Existence test. Yup, it's there. |
601 | */ |
602 | if (mask == 0) |
603 | return 0; |
604 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
605 | smk_ad_setfield_u_fs_inode(&ad, inode); |
606 | return smk_curacc(smk_of_inode(inode), mask, &ad); |
607 | } |
608 | |
609 | /** |
610 | * smack_inode_setattr - Smack check for setting attributes |
611 | * @dentry: the object |
612 | * @iattr: for the force flag |
613 | * |
614 | * Returns 0 if access is permitted, an error code otherwise |
615 | */ |
616 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
617 | { |
618 | struct smk_audit_info ad; |
619 | /* |
620 | * Need to allow for clearing the setuid bit. |
621 | */ |
622 | if (iattr->ia_valid & ATTR_FORCE) |
623 | return 0; |
624 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
625 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
626 | |
627 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
628 | } |
629 | |
630 | /** |
631 | * smack_inode_getattr - Smack check for getting attributes |
632 | * @mnt: unused |
633 | * @dentry: the object |
634 | * |
635 | * Returns 0 if access is permitted, an error code otherwise |
636 | */ |
637 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
638 | { |
639 | struct smk_audit_info ad; |
640 | |
641 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
642 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
643 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
644 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
645 | } |
646 | |
647 | /** |
648 | * smack_inode_setxattr - Smack check for setting xattrs |
649 | * @dentry: the object |
650 | * @name: name of the attribute |
651 | * @value: unused |
652 | * @size: unused |
653 | * @flags: unused |
654 | * |
655 | * This protects the Smack attribute explicitly. |
656 | * |
657 | * Returns 0 if access is permitted, an error code otherwise |
658 | */ |
659 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
660 | const void *value, size_t size, int flags) |
661 | { |
662 | struct smk_audit_info ad; |
663 | int rc = 0; |
664 | |
665 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
666 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || |
667 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
668 | if (!capable(CAP_MAC_ADMIN)) |
669 | rc = -EPERM; |
670 | /* |
671 | * check label validity here so import wont fail on |
672 | * post_setxattr |
673 | */ |
674 | if (size == 0 || size >= SMK_LABELLEN || |
675 | smk_import(value, size) == NULL) |
676 | rc = -EINVAL; |
677 | } else |
678 | rc = cap_inode_setxattr(dentry, name, value, size, flags); |
679 | |
680 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
681 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
682 | |
683 | if (rc == 0) |
684 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
685 | |
686 | return rc; |
687 | } |
688 | |
689 | /** |
690 | * smack_inode_post_setxattr - Apply the Smack update approved above |
691 | * @dentry: object |
692 | * @name: attribute name |
693 | * @value: attribute value |
694 | * @size: attribute size |
695 | * @flags: unused |
696 | * |
697 | * Set the pointer in the inode blob to the entry found |
698 | * in the master label list. |
699 | */ |
700 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
701 | const void *value, size_t size, int flags) |
702 | { |
703 | struct inode_smack *isp; |
704 | char *nsp; |
705 | |
706 | /* |
707 | * Not SMACK |
708 | */ |
709 | if (strcmp(name, XATTR_NAME_SMACK)) |
710 | return; |
711 | |
712 | isp = dentry->d_inode->i_security; |
713 | |
714 | /* |
715 | * No locking is done here. This is a pointer |
716 | * assignment. |
717 | */ |
718 | nsp = smk_import(value, size); |
719 | if (nsp != NULL) |
720 | isp->smk_inode = nsp; |
721 | else |
722 | isp->smk_inode = smack_known_invalid.smk_known; |
723 | |
724 | return; |
725 | } |
726 | |
727 | /* |
728 | * smack_inode_getxattr - Smack check on getxattr |
729 | * @dentry: the object |
730 | * @name: unused |
731 | * |
732 | * Returns 0 if access is permitted, an error code otherwise |
733 | */ |
734 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
735 | { |
736 | struct smk_audit_info ad; |
737 | |
738 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
739 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
740 | |
741 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
742 | } |
743 | |
744 | /* |
745 | * smack_inode_removexattr - Smack check on removexattr |
746 | * @dentry: the object |
747 | * @name: name of the attribute |
748 | * |
749 | * Removing the Smack attribute requires CAP_MAC_ADMIN |
750 | * |
751 | * Returns 0 if access is permitted, an error code otherwise |
752 | */ |
753 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
754 | { |
755 | struct smk_audit_info ad; |
756 | int rc = 0; |
757 | |
758 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
759 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || |
760 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
761 | if (!capable(CAP_MAC_ADMIN)) |
762 | rc = -EPERM; |
763 | } else |
764 | rc = cap_inode_removexattr(dentry, name); |
765 | |
766 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
767 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
768 | if (rc == 0) |
769 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
770 | |
771 | return rc; |
772 | } |
773 | |
774 | /** |
775 | * smack_inode_getsecurity - get smack xattrs |
776 | * @inode: the object |
777 | * @name: attribute name |
778 | * @buffer: where to put the result |
779 | * @alloc: unused |
780 | * |
781 | * Returns the size of the attribute or an error code |
782 | */ |
783 | static int smack_inode_getsecurity(const struct inode *inode, |
784 | const char *name, void **buffer, |
785 | bool alloc) |
786 | { |
787 | struct socket_smack *ssp; |
788 | struct socket *sock; |
789 | struct super_block *sbp; |
790 | struct inode *ip = (struct inode *)inode; |
791 | char *isp; |
792 | int ilen; |
793 | int rc = 0; |
794 | |
795 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
796 | isp = smk_of_inode(inode); |
797 | ilen = strlen(isp) + 1; |
798 | *buffer = isp; |
799 | return ilen; |
800 | } |
801 | |
802 | /* |
803 | * The rest of the Smack xattrs are only on sockets. |
804 | */ |
805 | sbp = ip->i_sb; |
806 | if (sbp->s_magic != SOCKFS_MAGIC) |
807 | return -EOPNOTSUPP; |
808 | |
809 | sock = SOCKET_I(ip); |
810 | if (sock == NULL || sock->sk == NULL) |
811 | return -EOPNOTSUPP; |
812 | |
813 | ssp = sock->sk->sk_security; |
814 | |
815 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
816 | isp = ssp->smk_in; |
817 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
818 | isp = ssp->smk_out; |
819 | else |
820 | return -EOPNOTSUPP; |
821 | |
822 | ilen = strlen(isp) + 1; |
823 | if (rc == 0) { |
824 | *buffer = isp; |
825 | rc = ilen; |
826 | } |
827 | |
828 | return rc; |
829 | } |
830 | |
831 | |
832 | /** |
833 | * smack_inode_listsecurity - list the Smack attributes |
834 | * @inode: the object |
835 | * @buffer: where they go |
836 | * @buffer_size: size of buffer |
837 | * |
838 | * Returns 0 on success, -EINVAL otherwise |
839 | */ |
840 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, |
841 | size_t buffer_size) |
842 | { |
843 | int len = strlen(XATTR_NAME_SMACK); |
844 | |
845 | if (buffer != NULL && len <= buffer_size) { |
846 | memcpy(buffer, XATTR_NAME_SMACK, len); |
847 | return len; |
848 | } |
849 | return -EINVAL; |
850 | } |
851 | |
852 | /** |
853 | * smack_inode_getsecid - Extract inode's security id |
854 | * @inode: inode to extract the info from |
855 | * @secid: where result will be saved |
856 | */ |
857 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) |
858 | { |
859 | struct inode_smack *isp = inode->i_security; |
860 | |
861 | *secid = smack_to_secid(isp->smk_inode); |
862 | } |
863 | |
864 | /* |
865 | * File Hooks |
866 | */ |
867 | |
868 | /** |
869 | * smack_file_permission - Smack check on file operations |
870 | * @file: unused |
871 | * @mask: unused |
872 | * |
873 | * Returns 0 |
874 | * |
875 | * Should access checks be done on each read or write? |
876 | * UNICOS and SELinux say yes. |
877 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. |
878 | * |
879 | * I'll say no for now. Smack does not do the frequent |
880 | * label changing that SELinux does. |
881 | */ |
882 | static int smack_file_permission(struct file *file, int mask) |
883 | { |
884 | return 0; |
885 | } |
886 | |
887 | /** |
888 | * smack_file_alloc_security - assign a file security blob |
889 | * @file: the object |
890 | * |
891 | * The security blob for a file is a pointer to the master |
892 | * label list, so no allocation is done. |
893 | * |
894 | * Returns 0 |
895 | */ |
896 | static int smack_file_alloc_security(struct file *file) |
897 | { |
898 | file->f_security = current_security(); |
899 | return 0; |
900 | } |
901 | |
902 | /** |
903 | * smack_file_free_security - clear a file security blob |
904 | * @file: the object |
905 | * |
906 | * The security blob for a file is a pointer to the master |
907 | * label list, so no memory is freed. |
908 | */ |
909 | static void smack_file_free_security(struct file *file) |
910 | { |
911 | file->f_security = NULL; |
912 | } |
913 | |
914 | /** |
915 | * smack_file_ioctl - Smack check on ioctls |
916 | * @file: the object |
917 | * @cmd: what to do |
918 | * @arg: unused |
919 | * |
920 | * Relies heavily on the correct use of the ioctl command conventions. |
921 | * |
922 | * Returns 0 if allowed, error code otherwise |
923 | */ |
924 | static int smack_file_ioctl(struct file *file, unsigned int cmd, |
925 | unsigned long arg) |
926 | { |
927 | int rc = 0; |
928 | struct smk_audit_info ad; |
929 | |
930 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
931 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
932 | |
933 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
934 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
935 | |
936 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) |
937 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
938 | |
939 | return rc; |
940 | } |
941 | |
942 | /** |
943 | * smack_file_lock - Smack check on file locking |
944 | * @file: the object |
945 | * @cmd: unused |
946 | * |
947 | * Returns 0 if current has write access, error code otherwise |
948 | */ |
949 | static int smack_file_lock(struct file *file, unsigned int cmd) |
950 | { |
951 | struct smk_audit_info ad; |
952 | |
953 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
954 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); |
955 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
956 | } |
957 | |
958 | /** |
959 | * smack_file_fcntl - Smack check on fcntl |
960 | * @file: the object |
961 | * @cmd: what action to check |
962 | * @arg: unused |
963 | * |
964 | * Returns 0 if current has access, error code otherwise |
965 | */ |
966 | static int smack_file_fcntl(struct file *file, unsigned int cmd, |
967 | unsigned long arg) |
968 | { |
969 | struct smk_audit_info ad; |
970 | int rc; |
971 | |
972 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
973 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
974 | |
975 | switch (cmd) { |
976 | case F_DUPFD: |
977 | case F_GETFD: |
978 | case F_GETFL: |
979 | case F_GETLK: |
980 | case F_GETOWN: |
981 | case F_GETSIG: |
982 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
983 | break; |
984 | case F_SETFD: |
985 | case F_SETFL: |
986 | case F_SETLK: |
987 | case F_SETLKW: |
988 | case F_SETOWN: |
989 | case F_SETSIG: |
990 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
991 | break; |
992 | default: |
993 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
994 | } |
995 | |
996 | return rc; |
997 | } |
998 | |
999 | /** |
1000 | * smack_file_set_fowner - set the file security blob value |
1001 | * @file: object in question |
1002 | * |
1003 | * Returns 0 |
1004 | * Further research may be required on this one. |
1005 | */ |
1006 | static int smack_file_set_fowner(struct file *file) |
1007 | { |
1008 | file->f_security = current_security(); |
1009 | return 0; |
1010 | } |
1011 | |
1012 | /** |
1013 | * smack_file_send_sigiotask - Smack on sigio |
1014 | * @tsk: The target task |
1015 | * @fown: the object the signal come from |
1016 | * @signum: unused |
1017 | * |
1018 | * Allow a privileged task to get signals even if it shouldn't |
1019 | * |
1020 | * Returns 0 if a subject with the object's smack could |
1021 | * write to the task, an error code otherwise. |
1022 | */ |
1023 | static int smack_file_send_sigiotask(struct task_struct *tsk, |
1024 | struct fown_struct *fown, int signum) |
1025 | { |
1026 | struct file *file; |
1027 | int rc; |
1028 | char *tsp = tsk->cred->security; |
1029 | struct smk_audit_info ad; |
1030 | |
1031 | /* |
1032 | * struct fown_struct is never outside the context of a struct file |
1033 | */ |
1034 | file = container_of(fown, struct file, f_owner); |
1035 | /* we don't log here as rc can be overriden */ |
1036 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); |
1037 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
1038 | rc = 0; |
1039 | |
1040 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1041 | smk_ad_setfield_u_tsk(&ad, tsk); |
1042 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); |
1043 | return rc; |
1044 | } |
1045 | |
1046 | /** |
1047 | * smack_file_receive - Smack file receive check |
1048 | * @file: the object |
1049 | * |
1050 | * Returns 0 if current has access, error code otherwise |
1051 | */ |
1052 | static int smack_file_receive(struct file *file) |
1053 | { |
1054 | int may = 0; |
1055 | struct smk_audit_info ad; |
1056 | |
1057 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1058 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
1059 | /* |
1060 | * This code relies on bitmasks. |
1061 | */ |
1062 | if (file->f_mode & FMODE_READ) |
1063 | may = MAY_READ; |
1064 | if (file->f_mode & FMODE_WRITE) |
1065 | may |= MAY_WRITE; |
1066 | |
1067 | return smk_curacc(file->f_security, may, &ad); |
1068 | } |
1069 | |
1070 | /* |
1071 | * Task hooks |
1072 | */ |
1073 | |
1074 | /** |
1075 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials |
1076 | * @new: the new credentials |
1077 | * @gfp: the atomicity of any memory allocations |
1078 | * |
1079 | * Prepare a blank set of credentials for modification. This must allocate all |
1080 | * the memory the LSM module might require such that cred_transfer() can |
1081 | * complete without error. |
1082 | */ |
1083 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
1084 | { |
1085 | cred->security = NULL; |
1086 | return 0; |
1087 | } |
1088 | |
1089 | |
1090 | /** |
1091 | * smack_cred_free - "free" task-level security credentials |
1092 | * @cred: the credentials in question |
1093 | * |
1094 | * Smack isn't using copies of blobs. Everyone |
1095 | * points to an immutable list. The blobs never go away. |
1096 | * There is no leak here. |
1097 | */ |
1098 | static void smack_cred_free(struct cred *cred) |
1099 | { |
1100 | cred->security = NULL; |
1101 | } |
1102 | |
1103 | /** |
1104 | * smack_cred_prepare - prepare new set of credentials for modification |
1105 | * @new: the new credentials |
1106 | * @old: the original credentials |
1107 | * @gfp: the atomicity of any memory allocations |
1108 | * |
1109 | * Prepare a new set of credentials for modification. |
1110 | */ |
1111 | static int smack_cred_prepare(struct cred *new, const struct cred *old, |
1112 | gfp_t gfp) |
1113 | { |
1114 | new->security = old->security; |
1115 | return 0; |
1116 | } |
1117 | |
1118 | /** |
1119 | * smack_cred_transfer - Transfer the old credentials to the new credentials |
1120 | * @new: the new credentials |
1121 | * @old: the original credentials |
1122 | * |
1123 | * Fill in a set of blank credentials from another set of credentials. |
1124 | */ |
1125 | static void smack_cred_transfer(struct cred *new, const struct cred *old) |
1126 | { |
1127 | new->security = old->security; |
1128 | } |
1129 | |
1130 | /** |
1131 | * smack_kernel_act_as - Set the subjective context in a set of credentials |
1132 | * @new: points to the set of credentials to be modified. |
1133 | * @secid: specifies the security ID to be set |
1134 | * |
1135 | * Set the security data for a kernel service. |
1136 | */ |
1137 | static int smack_kernel_act_as(struct cred *new, u32 secid) |
1138 | { |
1139 | char *smack = smack_from_secid(secid); |
1140 | |
1141 | if (smack == NULL) |
1142 | return -EINVAL; |
1143 | |
1144 | new->security = smack; |
1145 | return 0; |
1146 | } |
1147 | |
1148 | /** |
1149 | * smack_kernel_create_files_as - Set the file creation label in a set of creds |
1150 | * @new: points to the set of credentials to be modified |
1151 | * @inode: points to the inode to use as a reference |
1152 | * |
1153 | * Set the file creation context in a set of credentials to the same |
1154 | * as the objective context of the specified inode |
1155 | */ |
1156 | static int smack_kernel_create_files_as(struct cred *new, |
1157 | struct inode *inode) |
1158 | { |
1159 | struct inode_smack *isp = inode->i_security; |
1160 | |
1161 | new->security = isp->smk_inode; |
1162 | return 0; |
1163 | } |
1164 | |
1165 | /** |
1166 | * smk_curacc_on_task - helper to log task related access |
1167 | * @p: the task object |
1168 | * @access : the access requested |
1169 | * |
1170 | * Return 0 if access is permitted |
1171 | */ |
1172 | static int smk_curacc_on_task(struct task_struct *p, int access) |
1173 | { |
1174 | struct smk_audit_info ad; |
1175 | |
1176 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1177 | smk_ad_setfield_u_tsk(&ad, p); |
1178 | return smk_curacc(task_security(p), access, &ad); |
1179 | } |
1180 | |
1181 | /** |
1182 | * smack_task_setpgid - Smack check on setting pgid |
1183 | * @p: the task object |
1184 | * @pgid: unused |
1185 | * |
1186 | * Return 0 if write access is permitted |
1187 | */ |
1188 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) |
1189 | { |
1190 | return smk_curacc_on_task(p, MAY_WRITE); |
1191 | } |
1192 | |
1193 | /** |
1194 | * smack_task_getpgid - Smack access check for getpgid |
1195 | * @p: the object task |
1196 | * |
1197 | * Returns 0 if current can read the object task, error code otherwise |
1198 | */ |
1199 | static int smack_task_getpgid(struct task_struct *p) |
1200 | { |
1201 | return smk_curacc_on_task(p, MAY_READ); |
1202 | } |
1203 | |
1204 | /** |
1205 | * smack_task_getsid - Smack access check for getsid |
1206 | * @p: the object task |
1207 | * |
1208 | * Returns 0 if current can read the object task, error code otherwise |
1209 | */ |
1210 | static int smack_task_getsid(struct task_struct *p) |
1211 | { |
1212 | return smk_curacc_on_task(p, MAY_READ); |
1213 | } |
1214 | |
1215 | /** |
1216 | * smack_task_getsecid - get the secid of the task |
1217 | * @p: the object task |
1218 | * @secid: where to put the result |
1219 | * |
1220 | * Sets the secid to contain a u32 version of the smack label. |
1221 | */ |
1222 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) |
1223 | { |
1224 | *secid = smack_to_secid(task_security(p)); |
1225 | } |
1226 | |
1227 | /** |
1228 | * smack_task_setnice - Smack check on setting nice |
1229 | * @p: the task object |
1230 | * @nice: unused |
1231 | * |
1232 | * Return 0 if write access is permitted |
1233 | */ |
1234 | static int smack_task_setnice(struct task_struct *p, int nice) |
1235 | { |
1236 | int rc; |
1237 | |
1238 | rc = cap_task_setnice(p, nice); |
1239 | if (rc == 0) |
1240 | rc = smk_curacc_on_task(p, MAY_WRITE); |
1241 | return rc; |
1242 | } |
1243 | |
1244 | /** |
1245 | * smack_task_setioprio - Smack check on setting ioprio |
1246 | * @p: the task object |
1247 | * @ioprio: unused |
1248 | * |
1249 | * Return 0 if write access is permitted |
1250 | */ |
1251 | static int smack_task_setioprio(struct task_struct *p, int ioprio) |
1252 | { |
1253 | int rc; |
1254 | |
1255 | rc = cap_task_setioprio(p, ioprio); |
1256 | if (rc == 0) |
1257 | rc = smk_curacc_on_task(p, MAY_WRITE); |
1258 | return rc; |
1259 | } |
1260 | |
1261 | /** |
1262 | * smack_task_getioprio - Smack check on reading ioprio |
1263 | * @p: the task object |
1264 | * |
1265 | * Return 0 if read access is permitted |
1266 | */ |
1267 | static int smack_task_getioprio(struct task_struct *p) |
1268 | { |
1269 | return smk_curacc_on_task(p, MAY_READ); |
1270 | } |
1271 | |
1272 | /** |
1273 | * smack_task_setscheduler - Smack check on setting scheduler |
1274 | * @p: the task object |
1275 | * @policy: unused |
1276 | * @lp: unused |
1277 | * |
1278 | * Return 0 if read access is permitted |
1279 | */ |
1280 | static int smack_task_setscheduler(struct task_struct *p) |
1281 | { |
1282 | int rc; |
1283 | |
1284 | rc = cap_task_setscheduler(p); |
1285 | if (rc == 0) |
1286 | rc = smk_curacc_on_task(p, MAY_WRITE); |
1287 | return rc; |
1288 | } |
1289 | |
1290 | /** |
1291 | * smack_task_getscheduler - Smack check on reading scheduler |
1292 | * @p: the task object |
1293 | * |
1294 | * Return 0 if read access is permitted |
1295 | */ |
1296 | static int smack_task_getscheduler(struct task_struct *p) |
1297 | { |
1298 | return smk_curacc_on_task(p, MAY_READ); |
1299 | } |
1300 | |
1301 | /** |
1302 | * smack_task_movememory - Smack check on moving memory |
1303 | * @p: the task object |
1304 | * |
1305 | * Return 0 if write access is permitted |
1306 | */ |
1307 | static int smack_task_movememory(struct task_struct *p) |
1308 | { |
1309 | return smk_curacc_on_task(p, MAY_WRITE); |
1310 | } |
1311 | |
1312 | /** |
1313 | * smack_task_kill - Smack check on signal delivery |
1314 | * @p: the task object |
1315 | * @info: unused |
1316 | * @sig: unused |
1317 | * @secid: identifies the smack to use in lieu of current's |
1318 | * |
1319 | * Return 0 if write access is permitted |
1320 | * |
1321 | * The secid behavior is an artifact of an SELinux hack |
1322 | * in the USB code. Someday it may go away. |
1323 | */ |
1324 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, |
1325 | int sig, u32 secid) |
1326 | { |
1327 | struct smk_audit_info ad; |
1328 | |
1329 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1330 | smk_ad_setfield_u_tsk(&ad, p); |
1331 | /* |
1332 | * Sending a signal requires that the sender |
1333 | * can write the receiver. |
1334 | */ |
1335 | if (secid == 0) |
1336 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
1337 | /* |
1338 | * If the secid isn't 0 we're dealing with some USB IO |
1339 | * specific behavior. This is not clean. For one thing |
1340 | * we can't take privilege into account. |
1341 | */ |
1342 | return smk_access(smack_from_secid(secid), task_security(p), |
1343 | MAY_WRITE, &ad); |
1344 | } |
1345 | |
1346 | /** |
1347 | * smack_task_wait - Smack access check for waiting |
1348 | * @p: task to wait for |
1349 | * |
1350 | * Returns 0 if current can wait for p, error code otherwise |
1351 | */ |
1352 | static int smack_task_wait(struct task_struct *p) |
1353 | { |
1354 | struct smk_audit_info ad; |
1355 | char *sp = current_security(); |
1356 | char *tsp = task_security(p); |
1357 | int rc; |
1358 | |
1359 | /* we don't log here, we can be overriden */ |
1360 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); |
1361 | if (rc == 0) |
1362 | goto out_log; |
1363 | |
1364 | /* |
1365 | * Allow the operation to succeed if either task |
1366 | * has privilege to perform operations that might |
1367 | * account for the smack labels having gotten to |
1368 | * be different in the first place. |
1369 | * |
1370 | * This breaks the strict subject/object access |
1371 | * control ideal, taking the object's privilege |
1372 | * state into account in the decision as well as |
1373 | * the smack value. |
1374 | */ |
1375 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
1376 | rc = 0; |
1377 | /* we log only if we didn't get overriden */ |
1378 | out_log: |
1379 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1380 | smk_ad_setfield_u_tsk(&ad, p); |
1381 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); |
1382 | return rc; |
1383 | } |
1384 | |
1385 | /** |
1386 | * smack_task_to_inode - copy task smack into the inode blob |
1387 | * @p: task to copy from |
1388 | * @inode: inode to copy to |
1389 | * |
1390 | * Sets the smack pointer in the inode security blob |
1391 | */ |
1392 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) |
1393 | { |
1394 | struct inode_smack *isp = inode->i_security; |
1395 | isp->smk_inode = task_security(p); |
1396 | } |
1397 | |
1398 | /* |
1399 | * Socket hooks. |
1400 | */ |
1401 | |
1402 | /** |
1403 | * smack_sk_alloc_security - Allocate a socket blob |
1404 | * @sk: the socket |
1405 | * @family: unused |
1406 | * @gfp_flags: memory allocation flags |
1407 | * |
1408 | * Assign Smack pointers to current |
1409 | * |
1410 | * Returns 0 on success, -ENOMEM is there's no memory |
1411 | */ |
1412 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) |
1413 | { |
1414 | char *csp = current_security(); |
1415 | struct socket_smack *ssp; |
1416 | |
1417 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); |
1418 | if (ssp == NULL) |
1419 | return -ENOMEM; |
1420 | |
1421 | ssp->smk_in = csp; |
1422 | ssp->smk_out = csp; |
1423 | ssp->smk_packet[0] = '\0'; |
1424 | |
1425 | sk->sk_security = ssp; |
1426 | |
1427 | return 0; |
1428 | } |
1429 | |
1430 | /** |
1431 | * smack_sk_free_security - Free a socket blob |
1432 | * @sk: the socket |
1433 | * |
1434 | * Clears the blob pointer |
1435 | */ |
1436 | static void smack_sk_free_security(struct sock *sk) |
1437 | { |
1438 | kfree(sk->sk_security); |
1439 | } |
1440 | |
1441 | /** |
1442 | * smack_host_label - check host based restrictions |
1443 | * @sip: the object end |
1444 | * |
1445 | * looks for host based access restrictions |
1446 | * |
1447 | * This version will only be appropriate for really small sets of single label |
1448 | * hosts. The caller is responsible for ensuring that the RCU read lock is |
1449 | * taken before calling this function. |
1450 | * |
1451 | * Returns the label of the far end or NULL if it's not special. |
1452 | */ |
1453 | static char *smack_host_label(struct sockaddr_in *sip) |
1454 | { |
1455 | struct smk_netlbladdr *snp; |
1456 | struct in_addr *siap = &sip->sin_addr; |
1457 | |
1458 | if (siap->s_addr == 0) |
1459 | return NULL; |
1460 | |
1461 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) |
1462 | /* |
1463 | * we break after finding the first match because |
1464 | * the list is sorted from longest to shortest mask |
1465 | * so we have found the most specific match |
1466 | */ |
1467 | if ((&snp->smk_host.sin_addr)->s_addr == |
1468 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1469 | /* we have found the special CIPSO option */ |
1470 | if (snp->smk_label == smack_cipso_option) |
1471 | return NULL; |
1472 | return snp->smk_label; |
1473 | } |
1474 | |
1475 | return NULL; |
1476 | } |
1477 | |
1478 | /** |
1479 | * smack_set_catset - convert a capset to netlabel mls categories |
1480 | * @catset: the Smack categories |
1481 | * @sap: where to put the netlabel categories |
1482 | * |
1483 | * Allocates and fills attr.mls.cat |
1484 | */ |
1485 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) |
1486 | { |
1487 | unsigned char *cp; |
1488 | unsigned char m; |
1489 | int cat; |
1490 | int rc; |
1491 | int byte; |
1492 | |
1493 | if (!catset) |
1494 | return; |
1495 | |
1496 | sap->flags |= NETLBL_SECATTR_MLS_CAT; |
1497 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); |
1498 | sap->attr.mls.cat->startbit = 0; |
1499 | |
1500 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) |
1501 | for (m = 0x80; m != 0; m >>= 1, cat++) { |
1502 | if ((m & *cp) == 0) |
1503 | continue; |
1504 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, |
1505 | cat, GFP_ATOMIC); |
1506 | } |
1507 | } |
1508 | |
1509 | /** |
1510 | * smack_to_secattr - fill a secattr from a smack value |
1511 | * @smack: the smack value |
1512 | * @nlsp: where the result goes |
1513 | * |
1514 | * Casey says that CIPSO is good enough for now. |
1515 | * It can be used to effect. |
1516 | * It can also be abused to effect when necessary. |
1517 | * Appologies to the TSIG group in general and GW in particular. |
1518 | */ |
1519 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) |
1520 | { |
1521 | struct smack_cipso cipso; |
1522 | int rc; |
1523 | |
1524 | nlsp->domain = smack; |
1525 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; |
1526 | |
1527 | rc = smack_to_cipso(smack, &cipso); |
1528 | if (rc == 0) { |
1529 | nlsp->attr.mls.lvl = cipso.smk_level; |
1530 | smack_set_catset(cipso.smk_catset, nlsp); |
1531 | } else { |
1532 | nlsp->attr.mls.lvl = smack_cipso_direct; |
1533 | smack_set_catset(smack, nlsp); |
1534 | } |
1535 | } |
1536 | |
1537 | /** |
1538 | * smack_netlabel - Set the secattr on a socket |
1539 | * @sk: the socket |
1540 | * @labeled: socket label scheme |
1541 | * |
1542 | * Convert the outbound smack value (smk_out) to a |
1543 | * secattr and attach it to the socket. |
1544 | * |
1545 | * Returns 0 on success or an error code |
1546 | */ |
1547 | static int smack_netlabel(struct sock *sk, int labeled) |
1548 | { |
1549 | struct socket_smack *ssp = sk->sk_security; |
1550 | struct netlbl_lsm_secattr secattr; |
1551 | int rc = 0; |
1552 | |
1553 | /* |
1554 | * Usually the netlabel code will handle changing the |
1555 | * packet labeling based on the label. |
1556 | * The case of a single label host is different, because |
1557 | * a single label host should never get a labeled packet |
1558 | * even though the label is usually associated with a packet |
1559 | * label. |
1560 | */ |
1561 | local_bh_disable(); |
1562 | bh_lock_sock_nested(sk); |
1563 | |
1564 | if (ssp->smk_out == smack_net_ambient || |
1565 | labeled == SMACK_UNLABELED_SOCKET) |
1566 | netlbl_sock_delattr(sk); |
1567 | else { |
1568 | netlbl_secattr_init(&secattr); |
1569 | smack_to_secattr(ssp->smk_out, &secattr); |
1570 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
1571 | netlbl_secattr_destroy(&secattr); |
1572 | } |
1573 | |
1574 | bh_unlock_sock(sk); |
1575 | local_bh_enable(); |
1576 | |
1577 | return rc; |
1578 | } |
1579 | |
1580 | /** |
1581 | * smack_netlbel_send - Set the secattr on a socket and perform access checks |
1582 | * @sk: the socket |
1583 | * @sap: the destination address |
1584 | * |
1585 | * Set the correct secattr for the given socket based on the destination |
1586 | * address and perform any outbound access checks needed. |
1587 | * |
1588 | * Returns 0 on success or an error code. |
1589 | * |
1590 | */ |
1591 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) |
1592 | { |
1593 | int rc; |
1594 | int sk_lbl; |
1595 | char *hostsp; |
1596 | struct socket_smack *ssp = sk->sk_security; |
1597 | struct smk_audit_info ad; |
1598 | |
1599 | rcu_read_lock(); |
1600 | hostsp = smack_host_label(sap); |
1601 | if (hostsp != NULL) { |
1602 | sk_lbl = SMACK_UNLABELED_SOCKET; |
1603 | #ifdef CONFIG_AUDIT |
1604 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
1605 | ad.a.u.net.family = sap->sin_family; |
1606 | ad.a.u.net.dport = sap->sin_port; |
1607 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; |
1608 | #endif |
1609 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); |
1610 | } else { |
1611 | sk_lbl = SMACK_CIPSO_SOCKET; |
1612 | rc = 0; |
1613 | } |
1614 | rcu_read_unlock(); |
1615 | if (rc != 0) |
1616 | return rc; |
1617 | |
1618 | return smack_netlabel(sk, sk_lbl); |
1619 | } |
1620 | |
1621 | /** |
1622 | * smack_inode_setsecurity - set smack xattrs |
1623 | * @inode: the object |
1624 | * @name: attribute name |
1625 | * @value: attribute value |
1626 | * @size: size of the attribute |
1627 | * @flags: unused |
1628 | * |
1629 | * Sets the named attribute in the appropriate blob |
1630 | * |
1631 | * Returns 0 on success, or an error code |
1632 | */ |
1633 | static int smack_inode_setsecurity(struct inode *inode, const char *name, |
1634 | const void *value, size_t size, int flags) |
1635 | { |
1636 | char *sp; |
1637 | struct inode_smack *nsp = inode->i_security; |
1638 | struct socket_smack *ssp; |
1639 | struct socket *sock; |
1640 | int rc = 0; |
1641 | |
1642 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
1643 | return -EACCES; |
1644 | |
1645 | sp = smk_import(value, size); |
1646 | if (sp == NULL) |
1647 | return -EINVAL; |
1648 | |
1649 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
1650 | nsp->smk_inode = sp; |
1651 | nsp->smk_flags |= SMK_INODE_INSTANT; |
1652 | return 0; |
1653 | } |
1654 | /* |
1655 | * The rest of the Smack xattrs are only on sockets. |
1656 | */ |
1657 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) |
1658 | return -EOPNOTSUPP; |
1659 | |
1660 | sock = SOCKET_I(inode); |
1661 | if (sock == NULL || sock->sk == NULL) |
1662 | return -EOPNOTSUPP; |
1663 | |
1664 | ssp = sock->sk->sk_security; |
1665 | |
1666 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1667 | ssp->smk_in = sp; |
1668 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
1669 | ssp->smk_out = sp; |
1670 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1671 | if (rc != 0) |
1672 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", |
1673 | __func__, -rc); |
1674 | } else |
1675 | return -EOPNOTSUPP; |
1676 | |
1677 | return 0; |
1678 | } |
1679 | |
1680 | /** |
1681 | * smack_socket_post_create - finish socket setup |
1682 | * @sock: the socket |
1683 | * @family: protocol family |
1684 | * @type: unused |
1685 | * @protocol: unused |
1686 | * @kern: unused |
1687 | * |
1688 | * Sets the netlabel information on the socket |
1689 | * |
1690 | * Returns 0 on success, and error code otherwise |
1691 | */ |
1692 | static int smack_socket_post_create(struct socket *sock, int family, |
1693 | int type, int protocol, int kern) |
1694 | { |
1695 | if (family != PF_INET || sock->sk == NULL) |
1696 | return 0; |
1697 | /* |
1698 | * Set the outbound netlbl. |
1699 | */ |
1700 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1701 | } |
1702 | |
1703 | /** |
1704 | * smack_socket_connect - connect access check |
1705 | * @sock: the socket |
1706 | * @sap: the other end |
1707 | * @addrlen: size of sap |
1708 | * |
1709 | * Verifies that a connection may be possible |
1710 | * |
1711 | * Returns 0 on success, and error code otherwise |
1712 | */ |
1713 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, |
1714 | int addrlen) |
1715 | { |
1716 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1717 | return 0; |
1718 | if (addrlen < sizeof(struct sockaddr_in)) |
1719 | return -EINVAL; |
1720 | |
1721 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
1722 | } |
1723 | |
1724 | /** |
1725 | * smack_flags_to_may - convert S_ to MAY_ values |
1726 | * @flags: the S_ value |
1727 | * |
1728 | * Returns the equivalent MAY_ value |
1729 | */ |
1730 | static int smack_flags_to_may(int flags) |
1731 | { |
1732 | int may = 0; |
1733 | |
1734 | if (flags & S_IRUGO) |
1735 | may |= MAY_READ; |
1736 | if (flags & S_IWUGO) |
1737 | may |= MAY_WRITE; |
1738 | if (flags & S_IXUGO) |
1739 | may |= MAY_EXEC; |
1740 | |
1741 | return may; |
1742 | } |
1743 | |
1744 | /** |
1745 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg |
1746 | * @msg: the object |
1747 | * |
1748 | * Returns 0 |
1749 | */ |
1750 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) |
1751 | { |
1752 | msg->security = current_security(); |
1753 | return 0; |
1754 | } |
1755 | |
1756 | /** |
1757 | * smack_msg_msg_free_security - Clear the security blob for msg_msg |
1758 | * @msg: the object |
1759 | * |
1760 | * Clears the blob pointer |
1761 | */ |
1762 | static void smack_msg_msg_free_security(struct msg_msg *msg) |
1763 | { |
1764 | msg->security = NULL; |
1765 | } |
1766 | |
1767 | /** |
1768 | * smack_of_shm - the smack pointer for the shm |
1769 | * @shp: the object |
1770 | * |
1771 | * Returns a pointer to the smack value |
1772 | */ |
1773 | static char *smack_of_shm(struct shmid_kernel *shp) |
1774 | { |
1775 | return (char *)shp->shm_perm.security; |
1776 | } |
1777 | |
1778 | /** |
1779 | * smack_shm_alloc_security - Set the security blob for shm |
1780 | * @shp: the object |
1781 | * |
1782 | * Returns 0 |
1783 | */ |
1784 | static int smack_shm_alloc_security(struct shmid_kernel *shp) |
1785 | { |
1786 | struct kern_ipc_perm *isp = &shp->shm_perm; |
1787 | |
1788 | isp->security = current_security(); |
1789 | return 0; |
1790 | } |
1791 | |
1792 | /** |
1793 | * smack_shm_free_security - Clear the security blob for shm |
1794 | * @shp: the object |
1795 | * |
1796 | * Clears the blob pointer |
1797 | */ |
1798 | static void smack_shm_free_security(struct shmid_kernel *shp) |
1799 | { |
1800 | struct kern_ipc_perm *isp = &shp->shm_perm; |
1801 | |
1802 | isp->security = NULL; |
1803 | } |
1804 | |
1805 | /** |
1806 | * smk_curacc_shm : check if current has access on shm |
1807 | * @shp : the object |
1808 | * @access : access requested |
1809 | * |
1810 | * Returns 0 if current has the requested access, error code otherwise |
1811 | */ |
1812 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) |
1813 | { |
1814 | char *ssp = smack_of_shm(shp); |
1815 | struct smk_audit_info ad; |
1816 | |
1817 | #ifdef CONFIG_AUDIT |
1818 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
1819 | ad.a.u.ipc_id = shp->shm_perm.id; |
1820 | #endif |
1821 | return smk_curacc(ssp, access, &ad); |
1822 | } |
1823 | |
1824 | /** |
1825 | * smack_shm_associate - Smack access check for shm |
1826 | * @shp: the object |
1827 | * @shmflg: access requested |
1828 | * |
1829 | * Returns 0 if current has the requested access, error code otherwise |
1830 | */ |
1831 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) |
1832 | { |
1833 | int may; |
1834 | |
1835 | may = smack_flags_to_may(shmflg); |
1836 | return smk_curacc_shm(shp, may); |
1837 | } |
1838 | |
1839 | /** |
1840 | * smack_shm_shmctl - Smack access check for shm |
1841 | * @shp: the object |
1842 | * @cmd: what it wants to do |
1843 | * |
1844 | * Returns 0 if current has the requested access, error code otherwise |
1845 | */ |
1846 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) |
1847 | { |
1848 | int may; |
1849 | |
1850 | switch (cmd) { |
1851 | case IPC_STAT: |
1852 | case SHM_STAT: |
1853 | may = MAY_READ; |
1854 | break; |
1855 | case IPC_SET: |
1856 | case SHM_LOCK: |
1857 | case SHM_UNLOCK: |
1858 | case IPC_RMID: |
1859 | may = MAY_READWRITE; |
1860 | break; |
1861 | case IPC_INFO: |
1862 | case SHM_INFO: |
1863 | /* |
1864 | * System level information. |
1865 | */ |
1866 | return 0; |
1867 | default: |
1868 | return -EINVAL; |
1869 | } |
1870 | return smk_curacc_shm(shp, may); |
1871 | } |
1872 | |
1873 | /** |
1874 | * smack_shm_shmat - Smack access for shmat |
1875 | * @shp: the object |
1876 | * @shmaddr: unused |
1877 | * @shmflg: access requested |
1878 | * |
1879 | * Returns 0 if current has the requested access, error code otherwise |
1880 | */ |
1881 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, |
1882 | int shmflg) |
1883 | { |
1884 | int may; |
1885 | |
1886 | may = smack_flags_to_may(shmflg); |
1887 | return smk_curacc_shm(shp, may); |
1888 | } |
1889 | |
1890 | /** |
1891 | * smack_of_sem - the smack pointer for the sem |
1892 | * @sma: the object |
1893 | * |
1894 | * Returns a pointer to the smack value |
1895 | */ |
1896 | static char *smack_of_sem(struct sem_array *sma) |
1897 | { |
1898 | return (char *)sma->sem_perm.security; |
1899 | } |
1900 | |
1901 | /** |
1902 | * smack_sem_alloc_security - Set the security blob for sem |
1903 | * @sma: the object |
1904 | * |
1905 | * Returns 0 |
1906 | */ |
1907 | static int smack_sem_alloc_security(struct sem_array *sma) |
1908 | { |
1909 | struct kern_ipc_perm *isp = &sma->sem_perm; |
1910 | |
1911 | isp->security = current_security(); |
1912 | return 0; |
1913 | } |
1914 | |
1915 | /** |
1916 | * smack_sem_free_security - Clear the security blob for sem |
1917 | * @sma: the object |
1918 | * |
1919 | * Clears the blob pointer |
1920 | */ |
1921 | static void smack_sem_free_security(struct sem_array *sma) |
1922 | { |
1923 | struct kern_ipc_perm *isp = &sma->sem_perm; |
1924 | |
1925 | isp->security = NULL; |
1926 | } |
1927 | |
1928 | /** |
1929 | * smk_curacc_sem : check if current has access on sem |
1930 | * @sma : the object |
1931 | * @access : access requested |
1932 | * |
1933 | * Returns 0 if current has the requested access, error code otherwise |
1934 | */ |
1935 | static int smk_curacc_sem(struct sem_array *sma, int access) |
1936 | { |
1937 | char *ssp = smack_of_sem(sma); |
1938 | struct smk_audit_info ad; |
1939 | |
1940 | #ifdef CONFIG_AUDIT |
1941 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
1942 | ad.a.u.ipc_id = sma->sem_perm.id; |
1943 | #endif |
1944 | return smk_curacc(ssp, access, &ad); |
1945 | } |
1946 | |
1947 | /** |
1948 | * smack_sem_associate - Smack access check for sem |
1949 | * @sma: the object |
1950 | * @semflg: access requested |
1951 | * |
1952 | * Returns 0 if current has the requested access, error code otherwise |
1953 | */ |
1954 | static int smack_sem_associate(struct sem_array *sma, int semflg) |
1955 | { |
1956 | int may; |
1957 | |
1958 | may = smack_flags_to_may(semflg); |
1959 | return smk_curacc_sem(sma, may); |
1960 | } |
1961 | |
1962 | /** |
1963 | * smack_sem_shmctl - Smack access check for sem |
1964 | * @sma: the object |
1965 | * @cmd: what it wants to do |
1966 | * |
1967 | * Returns 0 if current has the requested access, error code otherwise |
1968 | */ |
1969 | static int smack_sem_semctl(struct sem_array *sma, int cmd) |
1970 | { |
1971 | int may; |
1972 | |
1973 | switch (cmd) { |
1974 | case GETPID: |
1975 | case GETNCNT: |
1976 | case GETZCNT: |
1977 | case GETVAL: |
1978 | case GETALL: |
1979 | case IPC_STAT: |
1980 | case SEM_STAT: |
1981 | may = MAY_READ; |
1982 | break; |
1983 | case SETVAL: |
1984 | case SETALL: |
1985 | case IPC_RMID: |
1986 | case IPC_SET: |
1987 | may = MAY_READWRITE; |
1988 | break; |
1989 | case IPC_INFO: |
1990 | case SEM_INFO: |
1991 | /* |
1992 | * System level information |
1993 | */ |
1994 | return 0; |
1995 | default: |
1996 | return -EINVAL; |
1997 | } |
1998 | |
1999 | return smk_curacc_sem(sma, may); |
2000 | } |
2001 | |
2002 | /** |
2003 | * smack_sem_semop - Smack checks of semaphore operations |
2004 | * @sma: the object |
2005 | * @sops: unused |
2006 | * @nsops: unused |
2007 | * @alter: unused |
2008 | * |
2009 | * Treated as read and write in all cases. |
2010 | * |
2011 | * Returns 0 if access is allowed, error code otherwise |
2012 | */ |
2013 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, |
2014 | unsigned nsops, int alter) |
2015 | { |
2016 | return smk_curacc_sem(sma, MAY_READWRITE); |
2017 | } |
2018 | |
2019 | /** |
2020 | * smack_msg_alloc_security - Set the security blob for msg |
2021 | * @msq: the object |
2022 | * |
2023 | * Returns 0 |
2024 | */ |
2025 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) |
2026 | { |
2027 | struct kern_ipc_perm *kisp = &msq->q_perm; |
2028 | |
2029 | kisp->security = current_security(); |
2030 | return 0; |
2031 | } |
2032 | |
2033 | /** |
2034 | * smack_msg_free_security - Clear the security blob for msg |
2035 | * @msq: the object |
2036 | * |
2037 | * Clears the blob pointer |
2038 | */ |
2039 | static void smack_msg_queue_free_security(struct msg_queue *msq) |
2040 | { |
2041 | struct kern_ipc_perm *kisp = &msq->q_perm; |
2042 | |
2043 | kisp->security = NULL; |
2044 | } |
2045 | |
2046 | /** |
2047 | * smack_of_msq - the smack pointer for the msq |
2048 | * @msq: the object |
2049 | * |
2050 | * Returns a pointer to the smack value |
2051 | */ |
2052 | static char *smack_of_msq(struct msg_queue *msq) |
2053 | { |
2054 | return (char *)msq->q_perm.security; |
2055 | } |
2056 | |
2057 | /** |
2058 | * smk_curacc_msq : helper to check if current has access on msq |
2059 | * @msq : the msq |
2060 | * @access : access requested |
2061 | * |
2062 | * return 0 if current has access, error otherwise |
2063 | */ |
2064 | static int smk_curacc_msq(struct msg_queue *msq, int access) |
2065 | { |
2066 | char *msp = smack_of_msq(msq); |
2067 | struct smk_audit_info ad; |
2068 | |
2069 | #ifdef CONFIG_AUDIT |
2070 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
2071 | ad.a.u.ipc_id = msq->q_perm.id; |
2072 | #endif |
2073 | return smk_curacc(msp, access, &ad); |
2074 | } |
2075 | |
2076 | /** |
2077 | * smack_msg_queue_associate - Smack access check for msg_queue |
2078 | * @msq: the object |
2079 | * @msqflg: access requested |
2080 | * |
2081 | * Returns 0 if current has the requested access, error code otherwise |
2082 | */ |
2083 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) |
2084 | { |
2085 | int may; |
2086 | |
2087 | may = smack_flags_to_may(msqflg); |
2088 | return smk_curacc_msq(msq, may); |
2089 | } |
2090 | |
2091 | /** |
2092 | * smack_msg_queue_msgctl - Smack access check for msg_queue |
2093 | * @msq: the object |
2094 | * @cmd: what it wants to do |
2095 | * |
2096 | * Returns 0 if current has the requested access, error code otherwise |
2097 | */ |
2098 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
2099 | { |
2100 | int may; |
2101 | |
2102 | switch (cmd) { |
2103 | case IPC_STAT: |
2104 | case MSG_STAT: |
2105 | may = MAY_READ; |
2106 | break; |
2107 | case IPC_SET: |
2108 | case IPC_RMID: |
2109 | may = MAY_READWRITE; |
2110 | break; |
2111 | case IPC_INFO: |
2112 | case MSG_INFO: |
2113 | /* |
2114 | * System level information |
2115 | */ |
2116 | return 0; |
2117 | default: |
2118 | return -EINVAL; |
2119 | } |
2120 | |
2121 | return smk_curacc_msq(msq, may); |
2122 | } |
2123 | |
2124 | /** |
2125 | * smack_msg_queue_msgsnd - Smack access check for msg_queue |
2126 | * @msq: the object |
2127 | * @msg: unused |
2128 | * @msqflg: access requested |
2129 | * |
2130 | * Returns 0 if current has the requested access, error code otherwise |
2131 | */ |
2132 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, |
2133 | int msqflg) |
2134 | { |
2135 | int may; |
2136 | |
2137 | may = smack_flags_to_may(msqflg); |
2138 | return smk_curacc_msq(msq, may); |
2139 | } |
2140 | |
2141 | /** |
2142 | * smack_msg_queue_msgsnd - Smack access check for msg_queue |
2143 | * @msq: the object |
2144 | * @msg: unused |
2145 | * @target: unused |
2146 | * @type: unused |
2147 | * @mode: unused |
2148 | * |
2149 | * Returns 0 if current has read and write access, error code otherwise |
2150 | */ |
2151 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
2152 | struct task_struct *target, long type, int mode) |
2153 | { |
2154 | return smk_curacc_msq(msq, MAY_READWRITE); |
2155 | } |
2156 | |
2157 | /** |
2158 | * smack_ipc_permission - Smack access for ipc_permission() |
2159 | * @ipp: the object permissions |
2160 | * @flag: access requested |
2161 | * |
2162 | * Returns 0 if current has read and write access, error code otherwise |
2163 | */ |
2164 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) |
2165 | { |
2166 | char *isp = ipp->security; |
2167 | int may = smack_flags_to_may(flag); |
2168 | struct smk_audit_info ad; |
2169 | |
2170 | #ifdef CONFIG_AUDIT |
2171 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); |
2172 | ad.a.u.ipc_id = ipp->id; |
2173 | #endif |
2174 | return smk_curacc(isp, may, &ad); |
2175 | } |
2176 | |
2177 | /** |
2178 | * smack_ipc_getsecid - Extract smack security id |
2179 | * @ipp: the object permissions |
2180 | * @secid: where result will be saved |
2181 | */ |
2182 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) |
2183 | { |
2184 | char *smack = ipp->security; |
2185 | |
2186 | *secid = smack_to_secid(smack); |
2187 | } |
2188 | |
2189 | /** |
2190 | * smack_d_instantiate - Make sure the blob is correct on an inode |
2191 | * @opt_dentry: dentry where inode will be attached |
2192 | * @inode: the object |
2193 | * |
2194 | * Set the inode's security blob if it hasn't been done already. |
2195 | */ |
2196 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) |
2197 | { |
2198 | struct super_block *sbp; |
2199 | struct superblock_smack *sbsp; |
2200 | struct inode_smack *isp; |
2201 | char *csp = current_security(); |
2202 | char *fetched; |
2203 | char *final; |
2204 | struct dentry *dp; |
2205 | |
2206 | if (inode == NULL) |
2207 | return; |
2208 | |
2209 | isp = inode->i_security; |
2210 | |
2211 | mutex_lock(&isp->smk_lock); |
2212 | /* |
2213 | * If the inode is already instantiated |
2214 | * take the quick way out |
2215 | */ |
2216 | if (isp->smk_flags & SMK_INODE_INSTANT) |
2217 | goto unlockandout; |
2218 | |
2219 | sbp = inode->i_sb; |
2220 | sbsp = sbp->s_security; |
2221 | /* |
2222 | * We're going to use the superblock default label |
2223 | * if there's no label on the file. |
2224 | */ |
2225 | final = sbsp->smk_default; |
2226 | |
2227 | /* |
2228 | * If this is the root inode the superblock |
2229 | * may be in the process of initialization. |
2230 | * If that is the case use the root value out |
2231 | * of the superblock. |
2232 | */ |
2233 | if (opt_dentry->d_parent == opt_dentry) { |
2234 | isp->smk_inode = sbsp->smk_root; |
2235 | isp->smk_flags |= SMK_INODE_INSTANT; |
2236 | goto unlockandout; |
2237 | } |
2238 | |
2239 | /* |
2240 | * This is pretty hackish. |
2241 | * Casey says that we shouldn't have to do |
2242 | * file system specific code, but it does help |
2243 | * with keeping it simple. |
2244 | */ |
2245 | switch (sbp->s_magic) { |
2246 | case SMACK_MAGIC: |
2247 | /* |
2248 | * Casey says that it's a little embarassing |
2249 | * that the smack file system doesn't do |
2250 | * extended attributes. |
2251 | */ |
2252 | final = smack_known_star.smk_known; |
2253 | break; |
2254 | case PIPEFS_MAGIC: |
2255 | /* |
2256 | * Casey says pipes are easy (?) |
2257 | */ |
2258 | final = smack_known_star.smk_known; |
2259 | break; |
2260 | case DEVPTS_SUPER_MAGIC: |
2261 | /* |
2262 | * devpts seems content with the label of the task. |
2263 | * Programs that change smack have to treat the |
2264 | * pty with respect. |
2265 | */ |
2266 | final = csp; |
2267 | break; |
2268 | case SOCKFS_MAGIC: |
2269 | /* |
2270 | * Casey says sockets get the smack of the task. |
2271 | */ |
2272 | final = csp; |
2273 | break; |
2274 | case PROC_SUPER_MAGIC: |
2275 | /* |
2276 | * Casey says procfs appears not to care. |
2277 | * The superblock default suffices. |
2278 | */ |
2279 | break; |
2280 | case TMPFS_MAGIC: |
2281 | /* |
2282 | * Device labels should come from the filesystem, |
2283 | * but watch out, because they're volitile, |
2284 | * getting recreated on every reboot. |
2285 | */ |
2286 | final = smack_known_star.smk_known; |
2287 | /* |
2288 | * No break. |
2289 | * |
2290 | * If a smack value has been set we want to use it, |
2291 | * but since tmpfs isn't giving us the opportunity |
2292 | * to set mount options simulate setting the |
2293 | * superblock default. |
2294 | */ |
2295 | default: |
2296 | /* |
2297 | * This isn't an understood special case. |
2298 | * Get the value from the xattr. |
2299 | * |
2300 | * No xattr support means, alas, no SMACK label. |
2301 | * Use the aforeapplied default. |
2302 | * It would be curious if the label of the task |
2303 | * does not match that assigned. |
2304 | */ |
2305 | if (inode->i_op->getxattr == NULL) |
2306 | break; |
2307 | /* |
2308 | * Get the dentry for xattr. |
2309 | */ |
2310 | dp = dget(opt_dentry); |
2311 | fetched = smk_fetch(inode, dp); |
2312 | if (fetched != NULL) |
2313 | final = fetched; |
2314 | dput(dp); |
2315 | break; |
2316 | } |
2317 | |
2318 | if (final == NULL) |
2319 | isp->smk_inode = csp; |
2320 | else |
2321 | isp->smk_inode = final; |
2322 | |
2323 | isp->smk_flags |= SMK_INODE_INSTANT; |
2324 | |
2325 | unlockandout: |
2326 | mutex_unlock(&isp->smk_lock); |
2327 | return; |
2328 | } |
2329 | |
2330 | /** |
2331 | * smack_getprocattr - Smack process attribute access |
2332 | * @p: the object task |
2333 | * @name: the name of the attribute in /proc/.../attr |
2334 | * @value: where to put the result |
2335 | * |
2336 | * Places a copy of the task Smack into value |
2337 | * |
2338 | * Returns the length of the smack label or an error code |
2339 | */ |
2340 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) |
2341 | { |
2342 | char *cp; |
2343 | int slen; |
2344 | |
2345 | if (strcmp(name, "current") != 0) |
2346 | return -EINVAL; |
2347 | |
2348 | cp = kstrdup(task_security(p), GFP_KERNEL); |
2349 | if (cp == NULL) |
2350 | return -ENOMEM; |
2351 | |
2352 | slen = strlen(cp); |
2353 | *value = cp; |
2354 | return slen; |
2355 | } |
2356 | |
2357 | /** |
2358 | * smack_setprocattr - Smack process attribute setting |
2359 | * @p: the object task |
2360 | * @name: the name of the attribute in /proc/.../attr |
2361 | * @value: the value to set |
2362 | * @size: the size of the value |
2363 | * |
2364 | * Sets the Smack value of the task. Only setting self |
2365 | * is permitted and only with privilege |
2366 | * |
2367 | * Returns the length of the smack label or an error code |
2368 | */ |
2369 | static int smack_setprocattr(struct task_struct *p, char *name, |
2370 | void *value, size_t size) |
2371 | { |
2372 | struct cred *new; |
2373 | char *newsmack; |
2374 | |
2375 | /* |
2376 | * Changing another process' Smack value is too dangerous |
2377 | * and supports no sane use case. |
2378 | */ |
2379 | if (p != current) |
2380 | return -EPERM; |
2381 | |
2382 | if (!capable(CAP_MAC_ADMIN)) |
2383 | return -EPERM; |
2384 | |
2385 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2386 | return -EINVAL; |
2387 | |
2388 | if (strcmp(name, "current") != 0) |
2389 | return -EINVAL; |
2390 | |
2391 | newsmack = smk_import(value, size); |
2392 | if (newsmack == NULL) |
2393 | return -EINVAL; |
2394 | |
2395 | /* |
2396 | * No process is ever allowed the web ("@") label. |
2397 | */ |
2398 | if (newsmack == smack_known_web.smk_known) |
2399 | return -EPERM; |
2400 | |
2401 | new = prepare_creds(); |
2402 | if (new == NULL) |
2403 | return -ENOMEM; |
2404 | new->security = newsmack; |
2405 | commit_creds(new); |
2406 | return size; |
2407 | } |
2408 | |
2409 | /** |
2410 | * smack_unix_stream_connect - Smack access on UDS |
2411 | * @sock: one socket |
2412 | * @other: the other socket |
2413 | * @newsk: unused |
2414 | * |
2415 | * Return 0 if a subject with the smack of sock could access |
2416 | * an object with the smack of other, otherwise an error code |
2417 | */ |
2418 | static int smack_unix_stream_connect(struct socket *sock, |
2419 | struct socket *other, struct sock *newsk) |
2420 | { |
2421 | struct inode *sp = SOCK_INODE(sock); |
2422 | struct inode *op = SOCK_INODE(other); |
2423 | struct smk_audit_info ad; |
2424 | |
2425 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2426 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
2427 | return smk_access(smk_of_inode(sp), smk_of_inode(op), |
2428 | MAY_READWRITE, &ad); |
2429 | } |
2430 | |
2431 | /** |
2432 | * smack_unix_may_send - Smack access on UDS |
2433 | * @sock: one socket |
2434 | * @other: the other socket |
2435 | * |
2436 | * Return 0 if a subject with the smack of sock could access |
2437 | * an object with the smack of other, otherwise an error code |
2438 | */ |
2439 | static int smack_unix_may_send(struct socket *sock, struct socket *other) |
2440 | { |
2441 | struct inode *sp = SOCK_INODE(sock); |
2442 | struct inode *op = SOCK_INODE(other); |
2443 | struct smk_audit_info ad; |
2444 | |
2445 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2446 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
2447 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); |
2448 | } |
2449 | |
2450 | /** |
2451 | * smack_socket_sendmsg - Smack check based on destination host |
2452 | * @sock: the socket |
2453 | * @msg: the message |
2454 | * @size: the size of the message |
2455 | * |
2456 | * Return 0 if the current subject can write to the destination |
2457 | * host. This is only a question if the destination is a single |
2458 | * label host. |
2459 | */ |
2460 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
2461 | int size) |
2462 | { |
2463 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; |
2464 | |
2465 | /* |
2466 | * Perfectly reasonable for this to be NULL |
2467 | */ |
2468 | if (sip == NULL || sip->sin_family != AF_INET) |
2469 | return 0; |
2470 | |
2471 | return smack_netlabel_send(sock->sk, sip); |
2472 | } |
2473 | |
2474 | |
2475 | /** |
2476 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
2477 | * @sap: netlabel secattr |
2478 | * @sip: where to put the result |
2479 | * |
2480 | * Copies a smack label into sip |
2481 | */ |
2482 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) |
2483 | { |
2484 | char smack[SMK_LABELLEN]; |
2485 | char *sp; |
2486 | int pcat; |
2487 | |
2488 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
2489 | /* |
2490 | * Looks like a CIPSO packet. |
2491 | * If there are flags but no level netlabel isn't |
2492 | * behaving the way we expect it to. |
2493 | * |
2494 | * Get the categories, if any |
2495 | * Without guidance regarding the smack value |
2496 | * for the packet fall back on the network |
2497 | * ambient value. |
2498 | */ |
2499 | memset(smack, '\0', SMK_LABELLEN); |
2500 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) |
2501 | for (pcat = -1;;) { |
2502 | pcat = netlbl_secattr_catmap_walk( |
2503 | sap->attr.mls.cat, pcat + 1); |
2504 | if (pcat < 0) |
2505 | break; |
2506 | smack_catset_bit(pcat, smack); |
2507 | } |
2508 | /* |
2509 | * If it is CIPSO using smack direct mapping |
2510 | * we are already done. WeeHee. |
2511 | */ |
2512 | if (sap->attr.mls.lvl == smack_cipso_direct) { |
2513 | memcpy(sip, smack, SMK_MAXLEN); |
2514 | return; |
2515 | } |
2516 | /* |
2517 | * Look it up in the supplied table if it is not |
2518 | * a direct mapping. |
2519 | */ |
2520 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); |
2521 | return; |
2522 | } |
2523 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2524 | /* |
2525 | * Looks like a fallback, which gives us a secid. |
2526 | */ |
2527 | sp = smack_from_secid(sap->attr.secid); |
2528 | /* |
2529 | * This has got to be a bug because it is |
2530 | * impossible to specify a fallback without |
2531 | * specifying the label, which will ensure |
2532 | * it has a secid, and the only way to get a |
2533 | * secid is from a fallback. |
2534 | */ |
2535 | BUG_ON(sp == NULL); |
2536 | strncpy(sip, sp, SMK_MAXLEN); |
2537 | return; |
2538 | } |
2539 | /* |
2540 | * Without guidance regarding the smack value |
2541 | * for the packet fall back on the network |
2542 | * ambient value. |
2543 | */ |
2544 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
2545 | return; |
2546 | } |
2547 | |
2548 | /** |
2549 | * smack_socket_sock_rcv_skb - Smack packet delivery access check |
2550 | * @sk: socket |
2551 | * @skb: packet |
2552 | * |
2553 | * Returns 0 if the packet should be delivered, an error code otherwise |
2554 | */ |
2555 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
2556 | { |
2557 | struct netlbl_lsm_secattr secattr; |
2558 | struct socket_smack *ssp = sk->sk_security; |
2559 | char smack[SMK_LABELLEN]; |
2560 | char *csp; |
2561 | int rc; |
2562 | struct smk_audit_info ad; |
2563 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2564 | return 0; |
2565 | |
2566 | /* |
2567 | * Translate what netlabel gave us. |
2568 | */ |
2569 | netlbl_secattr_init(&secattr); |
2570 | |
2571 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
2572 | if (rc == 0) { |
2573 | smack_from_secattr(&secattr, smack); |
2574 | csp = smack; |
2575 | } else |
2576 | csp = smack_net_ambient; |
2577 | |
2578 | netlbl_secattr_destroy(&secattr); |
2579 | |
2580 | #ifdef CONFIG_AUDIT |
2581 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2582 | ad.a.u.net.family = sk->sk_family; |
2583 | ad.a.u.net.netif = skb->skb_iif; |
2584 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2585 | #endif |
2586 | /* |
2587 | * Receiving a packet requires that the other end |
2588 | * be able to write here. Read access is not required. |
2589 | * This is the simplist possible security model |
2590 | * for networking. |
2591 | */ |
2592 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
2593 | if (rc != 0) |
2594 | netlbl_skbuff_err(skb, rc, 0); |
2595 | return rc; |
2596 | } |
2597 | |
2598 | /** |
2599 | * smack_socket_getpeersec_stream - pull in packet label |
2600 | * @sock: the socket |
2601 | * @optval: user's destination |
2602 | * @optlen: size thereof |
2603 | * @len: max thereof |
2604 | * |
2605 | * returns zero on success, an error code otherwise |
2606 | */ |
2607 | static int smack_socket_getpeersec_stream(struct socket *sock, |
2608 | char __user *optval, |
2609 | int __user *optlen, unsigned len) |
2610 | { |
2611 | struct socket_smack *ssp; |
2612 | int slen; |
2613 | int rc = 0; |
2614 | |
2615 | ssp = sock->sk->sk_security; |
2616 | slen = strlen(ssp->smk_packet) + 1; |
2617 | |
2618 | if (slen > len) |
2619 | rc = -ERANGE; |
2620 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) |
2621 | rc = -EFAULT; |
2622 | |
2623 | if (put_user(slen, optlen) != 0) |
2624 | rc = -EFAULT; |
2625 | |
2626 | return rc; |
2627 | } |
2628 | |
2629 | |
2630 | /** |
2631 | * smack_socket_getpeersec_dgram - pull in packet label |
2632 | * @sock: the socket |
2633 | * @skb: packet data |
2634 | * @secid: pointer to where to put the secid of the packet |
2635 | * |
2636 | * Sets the netlabel socket state on sk from parent |
2637 | */ |
2638 | static int smack_socket_getpeersec_dgram(struct socket *sock, |
2639 | struct sk_buff *skb, u32 *secid) |
2640 | |
2641 | { |
2642 | struct netlbl_lsm_secattr secattr; |
2643 | struct sock *sk; |
2644 | char smack[SMK_LABELLEN]; |
2645 | int family = PF_INET; |
2646 | u32 s; |
2647 | int rc; |
2648 | |
2649 | /* |
2650 | * Only works for families with packets. |
2651 | */ |
2652 | if (sock != NULL) { |
2653 | sk = sock->sk; |
2654 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2655 | return 0; |
2656 | family = sk->sk_family; |
2657 | } |
2658 | /* |
2659 | * Translate what netlabel gave us. |
2660 | */ |
2661 | netlbl_secattr_init(&secattr); |
2662 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
2663 | if (rc == 0) |
2664 | smack_from_secattr(&secattr, smack); |
2665 | netlbl_secattr_destroy(&secattr); |
2666 | |
2667 | /* |
2668 | * Give up if we couldn't get anything |
2669 | */ |
2670 | if (rc != 0) |
2671 | return rc; |
2672 | |
2673 | s = smack_to_secid(smack); |
2674 | if (s == 0) |
2675 | return -EINVAL; |
2676 | |
2677 | *secid = s; |
2678 | return 0; |
2679 | } |
2680 | |
2681 | /** |
2682 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2683 | * @sk: child sock |
2684 | * @parent: parent socket |
2685 | * |
2686 | * Set the smk_{in,out} state of an existing sock based on the process that |
2687 | * is creating the new socket. |
2688 | */ |
2689 | static void smack_sock_graft(struct sock *sk, struct socket *parent) |
2690 | { |
2691 | struct socket_smack *ssp; |
2692 | |
2693 | if (sk == NULL || |
2694 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) |
2695 | return; |
2696 | |
2697 | ssp = sk->sk_security; |
2698 | ssp->smk_in = ssp->smk_out = current_security(); |
2699 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
2700 | } |
2701 | |
2702 | /** |
2703 | * smack_inet_conn_request - Smack access check on connect |
2704 | * @sk: socket involved |
2705 | * @skb: packet |
2706 | * @req: unused |
2707 | * |
2708 | * Returns 0 if a task with the packet label could write to |
2709 | * the socket, otherwise an error code |
2710 | */ |
2711 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
2712 | struct request_sock *req) |
2713 | { |
2714 | u16 family = sk->sk_family; |
2715 | struct socket_smack *ssp = sk->sk_security; |
2716 | struct netlbl_lsm_secattr secattr; |
2717 | struct sockaddr_in addr; |
2718 | struct iphdr *hdr; |
2719 | char smack[SMK_LABELLEN]; |
2720 | int rc; |
2721 | struct smk_audit_info ad; |
2722 | |
2723 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2724 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
2725 | family = PF_INET; |
2726 | |
2727 | netlbl_secattr_init(&secattr); |
2728 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
2729 | if (rc == 0) |
2730 | smack_from_secattr(&secattr, smack); |
2731 | else |
2732 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); |
2733 | netlbl_secattr_destroy(&secattr); |
2734 | |
2735 | #ifdef CONFIG_AUDIT |
2736 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2737 | ad.a.u.net.family = family; |
2738 | ad.a.u.net.netif = skb->skb_iif; |
2739 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2740 | #endif |
2741 | /* |
2742 | * Receiving a packet requires that the other end be able to write |
2743 | * here. Read access is not required. |
2744 | */ |
2745 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
2746 | if (rc != 0) |
2747 | return rc; |
2748 | |
2749 | /* |
2750 | * Save the peer's label in the request_sock so we can later setup |
2751 | * smk_packet in the child socket so that SO_PEERCRED can report it. |
2752 | */ |
2753 | req->peer_secid = smack_to_secid(smack); |
2754 | |
2755 | /* |
2756 | * We need to decide if we want to label the incoming connection here |
2757 | * if we do we only need to label the request_sock and the stack will |
2758 | * propogate the wire-label to the sock when it is created. |
2759 | */ |
2760 | hdr = ip_hdr(skb); |
2761 | addr.sin_addr.s_addr = hdr->saddr; |
2762 | rcu_read_lock(); |
2763 | if (smack_host_label(&addr) == NULL) { |
2764 | rcu_read_unlock(); |
2765 | netlbl_secattr_init(&secattr); |
2766 | smack_to_secattr(smack, &secattr); |
2767 | rc = netlbl_req_setattr(req, &secattr); |
2768 | netlbl_secattr_destroy(&secattr); |
2769 | } else { |
2770 | rcu_read_unlock(); |
2771 | netlbl_req_delattr(req); |
2772 | } |
2773 | |
2774 | return rc; |
2775 | } |
2776 | |
2777 | /** |
2778 | * smack_inet_csk_clone - Copy the connection information to the new socket |
2779 | * @sk: the new socket |
2780 | * @req: the connection's request_sock |
2781 | * |
2782 | * Transfer the connection's peer label to the newly created socket. |
2783 | */ |
2784 | static void smack_inet_csk_clone(struct sock *sk, |
2785 | const struct request_sock *req) |
2786 | { |
2787 | struct socket_smack *ssp = sk->sk_security; |
2788 | char *smack; |
2789 | |
2790 | if (req->peer_secid != 0) { |
2791 | smack = smack_from_secid(req->peer_secid); |
2792 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); |
2793 | } else |
2794 | ssp->smk_packet[0] = '\0'; |
2795 | } |
2796 | |
2797 | /* |
2798 | * Key management security hooks |
2799 | * |
2800 | * Casey has not tested key support very heavily. |
2801 | * The permission check is most likely too restrictive. |
2802 | * If you care about keys please have a look. |
2803 | */ |
2804 | #ifdef CONFIG_KEYS |
2805 | |
2806 | /** |
2807 | * smack_key_alloc - Set the key security blob |
2808 | * @key: object |
2809 | * @cred: the credentials to use |
2810 | * @flags: unused |
2811 | * |
2812 | * No allocation required |
2813 | * |
2814 | * Returns 0 |
2815 | */ |
2816 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
2817 | unsigned long flags) |
2818 | { |
2819 | key->security = cred->security; |
2820 | return 0; |
2821 | } |
2822 | |
2823 | /** |
2824 | * smack_key_free - Clear the key security blob |
2825 | * @key: the object |
2826 | * |
2827 | * Clear the blob pointer |
2828 | */ |
2829 | static void smack_key_free(struct key *key) |
2830 | { |
2831 | key->security = NULL; |
2832 | } |
2833 | |
2834 | /* |
2835 | * smack_key_permission - Smack access on a key |
2836 | * @key_ref: gets to the object |
2837 | * @cred: the credentials to use |
2838 | * @perm: unused |
2839 | * |
2840 | * Return 0 if the task has read and write to the object, |
2841 | * an error code otherwise |
2842 | */ |
2843 | static int smack_key_permission(key_ref_t key_ref, |
2844 | const struct cred *cred, key_perm_t perm) |
2845 | { |
2846 | struct key *keyp; |
2847 | struct smk_audit_info ad; |
2848 | |
2849 | keyp = key_ref_to_ptr(key_ref); |
2850 | if (keyp == NULL) |
2851 | return -EINVAL; |
2852 | /* |
2853 | * If the key hasn't been initialized give it access so that |
2854 | * it may do so. |
2855 | */ |
2856 | if (keyp->security == NULL) |
2857 | return 0; |
2858 | /* |
2859 | * This should not occur |
2860 | */ |
2861 | if (cred->security == NULL) |
2862 | return -EACCES; |
2863 | #ifdef CONFIG_AUDIT |
2864 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); |
2865 | ad.a.u.key_struct.key = keyp->serial; |
2866 | ad.a.u.key_struct.key_desc = keyp->description; |
2867 | #endif |
2868 | return smk_access(cred->security, keyp->security, |
2869 | MAY_READWRITE, &ad); |
2870 | } |
2871 | #endif /* CONFIG_KEYS */ |
2872 | |
2873 | /* |
2874 | * Smack Audit hooks |
2875 | * |
2876 | * Audit requires a unique representation of each Smack specific |
2877 | * rule. This unique representation is used to distinguish the |
2878 | * object to be audited from remaining kernel objects and also |
2879 | * works as a glue between the audit hooks. |
2880 | * |
2881 | * Since repository entries are added but never deleted, we'll use |
2882 | * the smack_known label address related to the given audit rule as |
2883 | * the needed unique representation. This also better fits the smack |
2884 | * model where nearly everything is a label. |
2885 | */ |
2886 | #ifdef CONFIG_AUDIT |
2887 | |
2888 | /** |
2889 | * smack_audit_rule_init - Initialize a smack audit rule |
2890 | * @field: audit rule fields given from user-space (audit.h) |
2891 | * @op: required testing operator (=, !=, >, <, ...) |
2892 | * @rulestr: smack label to be audited |
2893 | * @vrule: pointer to save our own audit rule representation |
2894 | * |
2895 | * Prepare to audit cases where (@field @op @rulestr) is true. |
2896 | * The label to be audited is created if necessay. |
2897 | */ |
2898 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
2899 | { |
2900 | char **rule = (char **)vrule; |
2901 | *rule = NULL; |
2902 | |
2903 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) |
2904 | return -EINVAL; |
2905 | |
2906 | if (op != Audit_equal && op != Audit_not_equal) |
2907 | return -EINVAL; |
2908 | |
2909 | *rule = smk_import(rulestr, 0); |
2910 | |
2911 | return 0; |
2912 | } |
2913 | |
2914 | /** |
2915 | * smack_audit_rule_known - Distinguish Smack audit rules |
2916 | * @krule: rule of interest, in Audit kernel representation format |
2917 | * |
2918 | * This is used to filter Smack rules from remaining Audit ones. |
2919 | * If it's proved that this rule belongs to us, the |
2920 | * audit_rule_match hook will be called to do the final judgement. |
2921 | */ |
2922 | static int smack_audit_rule_known(struct audit_krule *krule) |
2923 | { |
2924 | struct audit_field *f; |
2925 | int i; |
2926 | |
2927 | for (i = 0; i < krule->field_count; i++) { |
2928 | f = &krule->fields[i]; |
2929 | |
2930 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) |
2931 | return 1; |
2932 | } |
2933 | |
2934 | return 0; |
2935 | } |
2936 | |
2937 | /** |
2938 | * smack_audit_rule_match - Audit given object ? |
2939 | * @secid: security id for identifying the object to test |
2940 | * @field: audit rule flags given from user-space |
2941 | * @op: required testing operator |
2942 | * @vrule: smack internal rule presentation |
2943 | * @actx: audit context associated with the check |
2944 | * |
2945 | * The core Audit hook. It's used to take the decision of |
2946 | * whether to audit or not to audit a given object. |
2947 | */ |
2948 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, |
2949 | struct audit_context *actx) |
2950 | { |
2951 | char *smack; |
2952 | char *rule = vrule; |
2953 | |
2954 | if (!rule) { |
2955 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, |
2956 | "Smack: missing rule\n"); |
2957 | return -ENOENT; |
2958 | } |
2959 | |
2960 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) |
2961 | return 0; |
2962 | |
2963 | smack = smack_from_secid(secid); |
2964 | |
2965 | /* |
2966 | * No need to do string comparisons. If a match occurs, |
2967 | * both pointers will point to the same smack_known |
2968 | * label. |
2969 | */ |
2970 | if (op == Audit_equal) |
2971 | return (rule == smack); |
2972 | if (op == Audit_not_equal) |
2973 | return (rule != smack); |
2974 | |
2975 | return 0; |
2976 | } |
2977 | |
2978 | /** |
2979 | * smack_audit_rule_free - free smack rule representation |
2980 | * @vrule: rule to be freed. |
2981 | * |
2982 | * No memory was allocated. |
2983 | */ |
2984 | static void smack_audit_rule_free(void *vrule) |
2985 | { |
2986 | /* No-op */ |
2987 | } |
2988 | |
2989 | #endif /* CONFIG_AUDIT */ |
2990 | |
2991 | /** |
2992 | * smack_secid_to_secctx - return the smack label for a secid |
2993 | * @secid: incoming integer |
2994 | * @secdata: destination |
2995 | * @seclen: how long it is |
2996 | * |
2997 | * Exists for networking code. |
2998 | */ |
2999 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
3000 | { |
3001 | char *sp = smack_from_secid(secid); |
3002 | |
3003 | if (secdata) |
3004 | *secdata = sp; |
3005 | *seclen = strlen(sp); |
3006 | return 0; |
3007 | } |
3008 | |
3009 | /** |
3010 | * smack_secctx_to_secid - return the secid for a smack label |
3011 | * @secdata: smack label |
3012 | * @seclen: how long result is |
3013 | * @secid: outgoing integer |
3014 | * |
3015 | * Exists for audit and networking code. |
3016 | */ |
3017 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
3018 | { |
3019 | *secid = smack_to_secid(secdata); |
3020 | return 0; |
3021 | } |
3022 | |
3023 | /** |
3024 | * smack_release_secctx - don't do anything. |
3025 | * @secdata: unused |
3026 | * @seclen: unused |
3027 | * |
3028 | * Exists to make sure nothing gets done, and properly |
3029 | */ |
3030 | static void smack_release_secctx(char *secdata, u32 seclen) |
3031 | { |
3032 | } |
3033 | |
3034 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3035 | { |
3036 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); |
3037 | } |
3038 | |
3039 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) |
3040 | { |
3041 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); |
3042 | } |
3043 | |
3044 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) |
3045 | { |
3046 | int len = 0; |
3047 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); |
3048 | |
3049 | if (len < 0) |
3050 | return len; |
3051 | *ctxlen = len; |
3052 | return 0; |
3053 | } |
3054 | |
3055 | struct security_operations smack_ops = { |
3056 | .name = "smack", |
3057 | |
3058 | .ptrace_access_check = smack_ptrace_access_check, |
3059 | .ptrace_traceme = smack_ptrace_traceme, |
3060 | .syslog = smack_syslog, |
3061 | |
3062 | .sb_alloc_security = smack_sb_alloc_security, |
3063 | .sb_free_security = smack_sb_free_security, |
3064 | .sb_copy_data = smack_sb_copy_data, |
3065 | .sb_kern_mount = smack_sb_kern_mount, |
3066 | .sb_statfs = smack_sb_statfs, |
3067 | .sb_mount = smack_sb_mount, |
3068 | .sb_umount = smack_sb_umount, |
3069 | |
3070 | .inode_alloc_security = smack_inode_alloc_security, |
3071 | .inode_free_security = smack_inode_free_security, |
3072 | .inode_init_security = smack_inode_init_security, |
3073 | .inode_link = smack_inode_link, |
3074 | .inode_unlink = smack_inode_unlink, |
3075 | .inode_rmdir = smack_inode_rmdir, |
3076 | .inode_rename = smack_inode_rename, |
3077 | .inode_permission = smack_inode_permission, |
3078 | .inode_setattr = smack_inode_setattr, |
3079 | .inode_getattr = smack_inode_getattr, |
3080 | .inode_setxattr = smack_inode_setxattr, |
3081 | .inode_post_setxattr = smack_inode_post_setxattr, |
3082 | .inode_getxattr = smack_inode_getxattr, |
3083 | .inode_removexattr = smack_inode_removexattr, |
3084 | .inode_getsecurity = smack_inode_getsecurity, |
3085 | .inode_setsecurity = smack_inode_setsecurity, |
3086 | .inode_listsecurity = smack_inode_listsecurity, |
3087 | .inode_getsecid = smack_inode_getsecid, |
3088 | |
3089 | .file_permission = smack_file_permission, |
3090 | .file_alloc_security = smack_file_alloc_security, |
3091 | .file_free_security = smack_file_free_security, |
3092 | .file_ioctl = smack_file_ioctl, |
3093 | .file_lock = smack_file_lock, |
3094 | .file_fcntl = smack_file_fcntl, |
3095 | .file_set_fowner = smack_file_set_fowner, |
3096 | .file_send_sigiotask = smack_file_send_sigiotask, |
3097 | .file_receive = smack_file_receive, |
3098 | |
3099 | .cred_alloc_blank = smack_cred_alloc_blank, |
3100 | .cred_free = smack_cred_free, |
3101 | .cred_prepare = smack_cred_prepare, |
3102 | .cred_transfer = smack_cred_transfer, |
3103 | .kernel_act_as = smack_kernel_act_as, |
3104 | .kernel_create_files_as = smack_kernel_create_files_as, |
3105 | .task_setpgid = smack_task_setpgid, |
3106 | .task_getpgid = smack_task_getpgid, |
3107 | .task_getsid = smack_task_getsid, |
3108 | .task_getsecid = smack_task_getsecid, |
3109 | .task_setnice = smack_task_setnice, |
3110 | .task_setioprio = smack_task_setioprio, |
3111 | .task_getioprio = smack_task_getioprio, |
3112 | .task_setscheduler = smack_task_setscheduler, |
3113 | .task_getscheduler = smack_task_getscheduler, |
3114 | .task_movememory = smack_task_movememory, |
3115 | .task_kill = smack_task_kill, |
3116 | .task_wait = smack_task_wait, |
3117 | .task_to_inode = smack_task_to_inode, |
3118 | |
3119 | .ipc_permission = smack_ipc_permission, |
3120 | .ipc_getsecid = smack_ipc_getsecid, |
3121 | |
3122 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, |
3123 | .msg_msg_free_security = smack_msg_msg_free_security, |
3124 | |
3125 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, |
3126 | .msg_queue_free_security = smack_msg_queue_free_security, |
3127 | .msg_queue_associate = smack_msg_queue_associate, |
3128 | .msg_queue_msgctl = smack_msg_queue_msgctl, |
3129 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, |
3130 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, |
3131 | |
3132 | .shm_alloc_security = smack_shm_alloc_security, |
3133 | .shm_free_security = smack_shm_free_security, |
3134 | .shm_associate = smack_shm_associate, |
3135 | .shm_shmctl = smack_shm_shmctl, |
3136 | .shm_shmat = smack_shm_shmat, |
3137 | |
3138 | .sem_alloc_security = smack_sem_alloc_security, |
3139 | .sem_free_security = smack_sem_free_security, |
3140 | .sem_associate = smack_sem_associate, |
3141 | .sem_semctl = smack_sem_semctl, |
3142 | .sem_semop = smack_sem_semop, |
3143 | |
3144 | .d_instantiate = smack_d_instantiate, |
3145 | |
3146 | .getprocattr = smack_getprocattr, |
3147 | .setprocattr = smack_setprocattr, |
3148 | |
3149 | .unix_stream_connect = smack_unix_stream_connect, |
3150 | .unix_may_send = smack_unix_may_send, |
3151 | |
3152 | .socket_post_create = smack_socket_post_create, |
3153 | .socket_connect = smack_socket_connect, |
3154 | .socket_sendmsg = smack_socket_sendmsg, |
3155 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3156 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, |
3157 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, |
3158 | .sk_alloc_security = smack_sk_alloc_security, |
3159 | .sk_free_security = smack_sk_free_security, |
3160 | .sock_graft = smack_sock_graft, |
3161 | .inet_conn_request = smack_inet_conn_request, |
3162 | .inet_csk_clone = smack_inet_csk_clone, |
3163 | |
3164 | /* key management security hooks */ |
3165 | #ifdef CONFIG_KEYS |
3166 | .key_alloc = smack_key_alloc, |
3167 | .key_free = smack_key_free, |
3168 | .key_permission = smack_key_permission, |
3169 | #endif /* CONFIG_KEYS */ |
3170 | |
3171 | /* Audit hooks */ |
3172 | #ifdef CONFIG_AUDIT |
3173 | .audit_rule_init = smack_audit_rule_init, |
3174 | .audit_rule_known = smack_audit_rule_known, |
3175 | .audit_rule_match = smack_audit_rule_match, |
3176 | .audit_rule_free = smack_audit_rule_free, |
3177 | #endif /* CONFIG_AUDIT */ |
3178 | |
3179 | .secid_to_secctx = smack_secid_to_secctx, |
3180 | .secctx_to_secid = smack_secctx_to_secid, |
3181 | .release_secctx = smack_release_secctx, |
3182 | .inode_notifysecctx = smack_inode_notifysecctx, |
3183 | .inode_setsecctx = smack_inode_setsecctx, |
3184 | .inode_getsecctx = smack_inode_getsecctx, |
3185 | }; |
3186 | |
3187 | |
3188 | static __init void init_smack_know_list(void) |
3189 | { |
3190 | list_add(&smack_known_huh.list, &smack_known_list); |
3191 | list_add(&smack_known_hat.list, &smack_known_list); |
3192 | list_add(&smack_known_star.list, &smack_known_list); |
3193 | list_add(&smack_known_floor.list, &smack_known_list); |
3194 | list_add(&smack_known_invalid.list, &smack_known_list); |
3195 | list_add(&smack_known_web.list, &smack_known_list); |
3196 | } |
3197 | |
3198 | /** |
3199 | * smack_init - initialize the smack system |
3200 | * |
3201 | * Returns 0 |
3202 | */ |
3203 | static __init int smack_init(void) |
3204 | { |
3205 | struct cred *cred; |
3206 | |
3207 | if (!security_module_enable(&smack_ops)) |
3208 | return 0; |
3209 | |
3210 | printk(KERN_INFO "Smack: Initializing.\n"); |
3211 | |
3212 | /* |
3213 | * Set the security state for the initial task. |
3214 | */ |
3215 | cred = (struct cred *) current->cred; |
3216 | cred->security = &smack_known_floor.smk_known; |
3217 | |
3218 | /* initialize the smack_know_list */ |
3219 | init_smack_know_list(); |
3220 | /* |
3221 | * Initialize locks |
3222 | */ |
3223 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3224 | spin_lock_init(&smack_known_hat.smk_cipsolock); |
3225 | spin_lock_init(&smack_known_star.smk_cipsolock); |
3226 | spin_lock_init(&smack_known_floor.smk_cipsolock); |
3227 | spin_lock_init(&smack_known_invalid.smk_cipsolock); |
3228 | |
3229 | /* |
3230 | * Register with LSM |
3231 | */ |
3232 | if (register_security(&smack_ops)) |
3233 | panic("smack: Unable to register with kernel.\n"); |
3234 | |
3235 | return 0; |
3236 | } |
3237 | |
3238 | /* |
3239 | * Smack requires early initialization in order to label |
3240 | * all processes and objects when they are created. |
3241 | */ |
3242 | security_initcall(smack_init); |
3243 |
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Tags:
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v2.6.34-rc5
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