Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e114e473 CS |
32 | #include <linux/mutex.h> |
33 | #include <linux/pipe_fs_i.h> | |
e114e473 | 34 | #include <net/cipso_ipv4.h> |
c6739443 CS |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
d20bdda6 | 37 | #include <linux/audit.h> |
1fd7317d | 38 | #include <linux/magic.h> |
2a7dba39 | 39 | #include <linux/dcache.h> |
16014d87 | 40 | #include <linux/personality.h> |
40401530 AV |
41 | #include <linux/msg.h> |
42 | #include <linux/shm.h> | |
43 | #include <linux/binfmts.h> | |
e114e473 CS |
44 | #include "smack.h" |
45 | ||
c69e8d9c DH |
46 | #define task_security(task) (task_cred_xxx((task), security)) |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
55 | LIST_HEAD(smk_ipv6_port_list); | |
56 | ||
d166c802 CS |
57 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
58 | static void smk_bu_mode(int mode, char *s) | |
59 | { | |
60 | int i = 0; | |
61 | ||
62 | if (mode & MAY_READ) | |
63 | s[i++] = 'r'; | |
64 | if (mode & MAY_WRITE) | |
65 | s[i++] = 'w'; | |
66 | if (mode & MAY_EXEC) | |
67 | s[i++] = 'x'; | |
68 | if (mode & MAY_APPEND) | |
69 | s[i++] = 'a'; | |
70 | if (mode & MAY_TRANSMUTE) | |
71 | s[i++] = 't'; | |
72 | if (mode & MAY_LOCK) | |
73 | s[i++] = 'l'; | |
74 | if (i == 0) | |
75 | s[i++] = '-'; | |
76 | s[i] = '\0'; | |
77 | } | |
78 | #endif | |
79 | ||
80 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
81 | static int smk_bu_note(char *note, struct smack_known *sskp, char *osp, | |
82 | int mode, int rc) | |
83 | { | |
84 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
85 | ||
86 | if (rc <= 0) | |
87 | return rc; | |
88 | ||
89 | smk_bu_mode(mode, acc); | |
90 | pr_info("Smack Bringup: (%s %s %s) %s\n", | |
91 | sskp->smk_known, osp, acc, note); | |
92 | return 0; | |
93 | } | |
94 | #else | |
95 | #define smk_bu_note(note, sskp, osp, mode, RC) (RC) | |
96 | #endif | |
97 | ||
98 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
99 | static int smk_bu_current(char *note, char *osp, int mode, int rc) | |
100 | { | |
101 | struct task_smack *tsp = current_security(); | |
102 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
103 | ||
104 | if (rc <= 0) | |
105 | return rc; | |
106 | ||
107 | smk_bu_mode(mode, acc); | |
108 | pr_info("Smack Bringup: (%s %s %s) %s %s\n", | |
109 | tsp->smk_task->smk_known, osp, acc, current->comm, note); | |
110 | return 0; | |
111 | } | |
112 | #else | |
113 | #define smk_bu_current(note, osp, mode, RC) (RC) | |
114 | #endif | |
115 | ||
116 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
117 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
118 | { | |
119 | struct task_smack *tsp = current_security(); | |
120 | struct task_smack *otsp = task_security(otp); | |
121 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
122 | ||
123 | if (rc <= 0) | |
124 | return rc; | |
125 | ||
126 | smk_bu_mode(mode, acc); | |
127 | pr_info("Smack Bringup: (%s %s %s) %s to %s\n", | |
128 | tsp->smk_task->smk_known, otsp->smk_task->smk_known, acc, | |
129 | current->comm, otp->comm); | |
130 | return 0; | |
131 | } | |
132 | #else | |
133 | #define smk_bu_task(otp, mode, RC) (RC) | |
134 | #endif | |
135 | ||
136 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
137 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
138 | { | |
139 | struct task_smack *tsp = current_security(); | |
140 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
141 | ||
142 | if (rc <= 0) | |
143 | return rc; | |
144 | ||
145 | smk_bu_mode(mode, acc); | |
146 | pr_info("Smack Bringup: (%s %s %s) inode=(%s %ld) %s\n", | |
147 | tsp->smk_task->smk_known, smk_of_inode(inode), acc, | |
148 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
149 | return 0; | |
150 | } | |
151 | #else | |
152 | #define smk_bu_inode(inode, mode, RC) (RC) | |
153 | #endif | |
154 | ||
155 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
156 | static int smk_bu_file(struct file *file, int mode, int rc) | |
157 | { | |
158 | struct task_smack *tsp = current_security(); | |
159 | struct smack_known *sskp = tsp->smk_task; | |
160 | struct inode *inode = file->f_inode; | |
161 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
162 | ||
163 | if (rc <= 0) | |
164 | return rc; | |
165 | ||
166 | smk_bu_mode(mode, acc); | |
167 | pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %s) %s\n", | |
168 | sskp->smk_known, (char *)file->f_security, acc, | |
169 | inode->i_sb->s_id, inode->i_ino, file->f_dentry->d_name.name, | |
170 | current->comm); | |
171 | return 0; | |
172 | } | |
173 | #else | |
174 | #define smk_bu_file(file, mode, RC) (RC) | |
175 | #endif | |
176 | ||
177 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
178 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
179 | int mode, int rc) | |
180 | { | |
181 | struct task_smack *tsp = cred->security; | |
182 | struct smack_known *sskp = tsp->smk_task; | |
183 | struct inode *inode = file->f_inode; | |
184 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
185 | ||
186 | if (rc <= 0) | |
187 | return rc; | |
188 | ||
189 | smk_bu_mode(mode, acc); | |
190 | pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %s) %s\n", | |
191 | sskp->smk_known, smk_of_inode(inode), acc, | |
192 | inode->i_sb->s_id, inode->i_ino, file->f_dentry->d_name.name, | |
193 | current->comm); | |
194 | return 0; | |
195 | } | |
196 | #else | |
197 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
198 | #endif | |
199 | ||
e114e473 CS |
200 | /** |
201 | * smk_fetch - Fetch the smack label from a file. | |
202 | * @ip: a pointer to the inode | |
203 | * @dp: a pointer to the dentry | |
204 | * | |
205 | * Returns a pointer to the master list entry for the Smack label | |
206 | * or NULL if there was no label to fetch. | |
207 | */ | |
2f823ff8 CS |
208 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
209 | struct dentry *dp) | |
e114e473 CS |
210 | { |
211 | int rc; | |
f7112e6c | 212 | char *buffer; |
2f823ff8 | 213 | struct smack_known *skp = NULL; |
e114e473 CS |
214 | |
215 | if (ip->i_op->getxattr == NULL) | |
216 | return NULL; | |
217 | ||
f7112e6c CS |
218 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
219 | if (buffer == NULL) | |
e114e473 CS |
220 | return NULL; |
221 | ||
f7112e6c CS |
222 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
223 | if (rc > 0) | |
2f823ff8 | 224 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
225 | |
226 | kfree(buffer); | |
227 | ||
2f823ff8 | 228 | return skp; |
e114e473 CS |
229 | } |
230 | ||
231 | /** | |
232 | * new_inode_smack - allocate an inode security blob | |
233 | * @smack: a pointer to the Smack label to use in the blob | |
234 | * | |
235 | * Returns the new blob or NULL if there's no memory available | |
236 | */ | |
237 | struct inode_smack *new_inode_smack(char *smack) | |
238 | { | |
239 | struct inode_smack *isp; | |
240 | ||
ceffec55 | 241 | isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); |
e114e473 CS |
242 | if (isp == NULL) |
243 | return NULL; | |
244 | ||
245 | isp->smk_inode = smack; | |
246 | isp->smk_flags = 0; | |
247 | mutex_init(&isp->smk_lock); | |
248 | ||
249 | return isp; | |
250 | } | |
251 | ||
7898e1f8 CS |
252 | /** |
253 | * new_task_smack - allocate a task security blob | |
254 | * @smack: a pointer to the Smack label to use in the blob | |
255 | * | |
256 | * Returns the new blob or NULL if there's no memory available | |
257 | */ | |
2f823ff8 CS |
258 | static struct task_smack *new_task_smack(struct smack_known *task, |
259 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
260 | { |
261 | struct task_smack *tsp; | |
262 | ||
263 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
264 | if (tsp == NULL) | |
265 | return NULL; | |
266 | ||
267 | tsp->smk_task = task; | |
268 | tsp->smk_forked = forked; | |
269 | INIT_LIST_HEAD(&tsp->smk_rules); | |
270 | mutex_init(&tsp->smk_rules_lock); | |
271 | ||
272 | return tsp; | |
273 | } | |
274 | ||
275 | /** | |
276 | * smk_copy_rules - copy a rule set | |
277 | * @nhead - new rules header pointer | |
278 | * @ohead - old rules header pointer | |
279 | * | |
280 | * Returns 0 on success, -ENOMEM on error | |
281 | */ | |
282 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
283 | gfp_t gfp) | |
284 | { | |
285 | struct smack_rule *nrp; | |
286 | struct smack_rule *orp; | |
287 | int rc = 0; | |
288 | ||
289 | INIT_LIST_HEAD(nhead); | |
290 | ||
291 | list_for_each_entry_rcu(orp, ohead, list) { | |
292 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
293 | if (nrp == NULL) { | |
294 | rc = -ENOMEM; | |
295 | break; | |
296 | } | |
297 | *nrp = *orp; | |
298 | list_add_rcu(&nrp->list, nhead); | |
299 | } | |
300 | return rc; | |
301 | } | |
302 | ||
5663884c LP |
303 | /** |
304 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
305 | * @mode - input mode in form of PTRACE_MODE_* | |
306 | * | |
307 | * Returns a converted MAY_* mode usable by smack rules | |
308 | */ | |
309 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
310 | { | |
311 | switch (mode) { | |
312 | case PTRACE_MODE_READ: | |
313 | return MAY_READ; | |
314 | case PTRACE_MODE_ATTACH: | |
315 | return MAY_READWRITE; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | /** | |
322 | * smk_ptrace_rule_check - helper for ptrace access | |
323 | * @tracer: tracer process | |
66867818 LP |
324 | * @tracee_label: label of the process that's about to be traced, |
325 | * the pointer must originate from smack structures | |
5663884c LP |
326 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
327 | * @func: name of the function that called us, used for audit | |
328 | * | |
329 | * Returns 0 on access granted, -error on error | |
330 | */ | |
331 | static int smk_ptrace_rule_check(struct task_struct *tracer, char *tracee_label, | |
332 | unsigned int mode, const char *func) | |
333 | { | |
334 | int rc; | |
335 | struct smk_audit_info ad, *saip = NULL; | |
336 | struct task_smack *tsp; | |
337 | struct smack_known *skp; | |
338 | ||
339 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
340 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
341 | smk_ad_setfield_u_tsk(&ad, tracer); | |
342 | saip = &ad; | |
343 | } | |
344 | ||
345 | tsp = task_security(tracer); | |
346 | skp = smk_of_task(tsp); | |
347 | ||
66867818 LP |
348 | if ((mode & PTRACE_MODE_ATTACH) && |
349 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
350 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
351 | if (skp->smk_known == tracee_label) | |
352 | rc = 0; | |
353 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
354 | rc = -EACCES; | |
355 | else if (capable(CAP_SYS_PTRACE)) | |
356 | rc = 0; | |
357 | else | |
358 | rc = -EACCES; | |
359 | ||
360 | if (saip) | |
361 | smack_log(skp->smk_known, tracee_label, 0, rc, saip); | |
362 | ||
363 | return rc; | |
364 | } | |
365 | ||
366 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
5663884c LP |
367 | rc = smk_tskacc(tsp, tracee_label, smk_ptrace_mode(mode), saip); |
368 | return rc; | |
369 | } | |
370 | ||
e114e473 CS |
371 | /* |
372 | * LSM hooks. | |
373 | * We he, that is fun! | |
374 | */ | |
375 | ||
376 | /** | |
9e48858f | 377 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 378 | * @ctp: child task pointer |
5663884c | 379 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
380 | * |
381 | * Returns 0 if access is OK, an error code otherwise | |
382 | * | |
5663884c | 383 | * Do the capability checks. |
e114e473 | 384 | */ |
9e48858f | 385 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
386 | { |
387 | int rc; | |
2f823ff8 | 388 | struct smack_known *skp; |
e114e473 | 389 | |
9e48858f | 390 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
391 | if (rc != 0) |
392 | return rc; | |
393 | ||
2f823ff8 | 394 | skp = smk_of_task(task_security(ctp)); |
ecfcc53f | 395 | |
5663884c | 396 | rc = smk_ptrace_rule_check(current, skp->smk_known, mode, __func__); |
5cd9c58f DH |
397 | return rc; |
398 | } | |
399 | ||
400 | /** | |
401 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
402 | * @ptp: parent task pointer | |
403 | * | |
404 | * Returns 0 if access is OK, an error code otherwise | |
405 | * | |
5663884c | 406 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
407 | */ |
408 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
409 | { | |
410 | int rc; | |
2f823ff8 | 411 | struct smack_known *skp; |
5cd9c58f DH |
412 | |
413 | rc = cap_ptrace_traceme(ptp); | |
414 | if (rc != 0) | |
415 | return rc; | |
e114e473 | 416 | |
959e6c7f | 417 | skp = smk_of_task(current_security()); |
ecfcc53f | 418 | |
5663884c LP |
419 | rc = smk_ptrace_rule_check(ptp, skp->smk_known, |
420 | PTRACE_MODE_ATTACH, __func__); | |
e114e473 CS |
421 | return rc; |
422 | } | |
423 | ||
424 | /** | |
425 | * smack_syslog - Smack approval on syslog | |
426 | * @type: message type | |
427 | * | |
e114e473 CS |
428 | * Returns 0 on success, error code otherwise. |
429 | */ | |
12b3052c | 430 | static int smack_syslog(int typefrom_file) |
e114e473 | 431 | { |
12b3052c | 432 | int rc = 0; |
2f823ff8 | 433 | struct smack_known *skp = smk_of_current(); |
e114e473 | 434 | |
1880eff7 | 435 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
436 | return 0; |
437 | ||
24ea1b6e | 438 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
439 | rc = -EACCES; |
440 | ||
441 | return rc; | |
442 | } | |
443 | ||
444 | ||
445 | /* | |
446 | * Superblock Hooks. | |
447 | */ | |
448 | ||
449 | /** | |
450 | * smack_sb_alloc_security - allocate a superblock blob | |
451 | * @sb: the superblock getting the blob | |
452 | * | |
453 | * Returns 0 on success or -ENOMEM on error. | |
454 | */ | |
455 | static int smack_sb_alloc_security(struct super_block *sb) | |
456 | { | |
457 | struct superblock_smack *sbsp; | |
458 | ||
459 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
460 | ||
461 | if (sbsp == NULL) | |
462 | return -ENOMEM; | |
463 | ||
464 | sbsp->smk_root = smack_known_floor.smk_known; | |
465 | sbsp->smk_default = smack_known_floor.smk_known; | |
466 | sbsp->smk_floor = smack_known_floor.smk_known; | |
467 | sbsp->smk_hat = smack_known_hat.smk_known; | |
e830b394 CS |
468 | /* |
469 | * smk_initialized will be zero from kzalloc. | |
470 | */ | |
e114e473 CS |
471 | sb->s_security = sbsp; |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | /** | |
477 | * smack_sb_free_security - free a superblock blob | |
478 | * @sb: the superblock getting the blob | |
479 | * | |
480 | */ | |
481 | static void smack_sb_free_security(struct super_block *sb) | |
482 | { | |
483 | kfree(sb->s_security); | |
484 | sb->s_security = NULL; | |
485 | } | |
486 | ||
487 | /** | |
488 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 489 | * @orig: where to start |
251a2a95 | 490 | * @smackopts: mount options string |
e114e473 CS |
491 | * |
492 | * Returns 0 on success or -ENOMEM on error. | |
493 | * | |
494 | * Copy the Smack specific mount options out of the mount | |
495 | * options list. | |
496 | */ | |
e0007529 | 497 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
498 | { |
499 | char *cp, *commap, *otheropts, *dp; | |
500 | ||
e114e473 CS |
501 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
502 | if (otheropts == NULL) | |
503 | return -ENOMEM; | |
504 | ||
505 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
506 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
507 | dp = smackopts; | |
508 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
509 | dp = smackopts; | |
510 | else if (strstr(cp, SMK_FSHAT) == cp) | |
511 | dp = smackopts; | |
512 | else if (strstr(cp, SMK_FSROOT) == cp) | |
513 | dp = smackopts; | |
e830b394 CS |
514 | else if (strstr(cp, SMK_FSTRANS) == cp) |
515 | dp = smackopts; | |
e114e473 CS |
516 | else |
517 | dp = otheropts; | |
518 | ||
519 | commap = strchr(cp, ','); | |
520 | if (commap != NULL) | |
521 | *commap = '\0'; | |
522 | ||
523 | if (*dp != '\0') | |
524 | strcat(dp, ","); | |
525 | strcat(dp, cp); | |
526 | } | |
527 | ||
528 | strcpy(orig, otheropts); | |
529 | free_page((unsigned long)otheropts); | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | /** | |
535 | * smack_sb_kern_mount - Smack specific mount processing | |
536 | * @sb: the file system superblock | |
12204e24 | 537 | * @flags: the mount flags |
e114e473 CS |
538 | * @data: the smack mount options |
539 | * | |
540 | * Returns 0 on success, an error code on failure | |
541 | */ | |
12204e24 | 542 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
543 | { |
544 | struct dentry *root = sb->s_root; | |
545 | struct inode *inode = root->d_inode; | |
546 | struct superblock_smack *sp = sb->s_security; | |
547 | struct inode_smack *isp; | |
24ea1b6e | 548 | struct smack_known *skp; |
e114e473 CS |
549 | char *op; |
550 | char *commap; | |
551 | char *nsp; | |
e830b394 | 552 | int transmute = 0; |
24ea1b6e | 553 | int specified = 0; |
e114e473 | 554 | |
e830b394 | 555 | if (sp->smk_initialized) |
e114e473 | 556 | return 0; |
eb982cb4 | 557 | |
e114e473 | 558 | sp->smk_initialized = 1; |
e114e473 CS |
559 | |
560 | for (op = data; op != NULL; op = commap) { | |
561 | commap = strchr(op, ','); | |
562 | if (commap != NULL) | |
563 | *commap++ = '\0'; | |
564 | ||
565 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
566 | op += strlen(SMK_FSHAT); | |
567 | nsp = smk_import(op, 0); | |
24ea1b6e | 568 | if (nsp != NULL) { |
e114e473 | 569 | sp->smk_hat = nsp; |
24ea1b6e CS |
570 | specified = 1; |
571 | } | |
e114e473 CS |
572 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
573 | op += strlen(SMK_FSFLOOR); | |
574 | nsp = smk_import(op, 0); | |
24ea1b6e | 575 | if (nsp != NULL) { |
e114e473 | 576 | sp->smk_floor = nsp; |
24ea1b6e CS |
577 | specified = 1; |
578 | } | |
e114e473 CS |
579 | } else if (strncmp(op, SMK_FSDEFAULT, |
580 | strlen(SMK_FSDEFAULT)) == 0) { | |
581 | op += strlen(SMK_FSDEFAULT); | |
582 | nsp = smk_import(op, 0); | |
24ea1b6e | 583 | if (nsp != NULL) { |
e114e473 | 584 | sp->smk_default = nsp; |
24ea1b6e CS |
585 | specified = 1; |
586 | } | |
e114e473 CS |
587 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
588 | op += strlen(SMK_FSROOT); | |
589 | nsp = smk_import(op, 0); | |
24ea1b6e | 590 | if (nsp != NULL) { |
e114e473 | 591 | sp->smk_root = nsp; |
24ea1b6e CS |
592 | specified = 1; |
593 | } | |
e830b394 CS |
594 | } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { |
595 | op += strlen(SMK_FSTRANS); | |
596 | nsp = smk_import(op, 0); | |
597 | if (nsp != NULL) { | |
598 | sp->smk_root = nsp; | |
599 | transmute = 1; | |
24ea1b6e | 600 | specified = 1; |
e830b394 | 601 | } |
e114e473 CS |
602 | } |
603 | } | |
604 | ||
24ea1b6e CS |
605 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
606 | /* | |
607 | * Unprivileged mounts don't get to specify Smack values. | |
608 | */ | |
609 | if (specified) | |
610 | return -EPERM; | |
611 | /* | |
612 | * Unprivileged mounts get root and default from the caller. | |
613 | */ | |
614 | skp = smk_of_current(); | |
615 | sp->smk_root = skp->smk_known; | |
616 | sp->smk_default = skp->smk_known; | |
617 | } | |
e114e473 CS |
618 | /* |
619 | * Initialize the root inode. | |
620 | */ | |
621 | isp = inode->i_security; | |
55dfc5da JB |
622 | if (isp == NULL) { |
623 | isp = new_inode_smack(sp->smk_root); | |
624 | if (isp == NULL) | |
625 | return -ENOMEM; | |
626 | inode->i_security = isp; | |
e830b394 | 627 | } else |
e114e473 CS |
628 | isp->smk_inode = sp->smk_root; |
629 | ||
e830b394 CS |
630 | if (transmute) |
631 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
632 | ||
e114e473 CS |
633 | return 0; |
634 | } | |
635 | ||
636 | /** | |
637 | * smack_sb_statfs - Smack check on statfs | |
638 | * @dentry: identifies the file system in question | |
639 | * | |
640 | * Returns 0 if current can read the floor of the filesystem, | |
641 | * and error code otherwise | |
642 | */ | |
643 | static int smack_sb_statfs(struct dentry *dentry) | |
644 | { | |
645 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
646 | int rc; |
647 | struct smk_audit_info ad; | |
648 | ||
a269434d | 649 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 650 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 651 | |
ecfcc53f | 652 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 653 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 654 | return rc; |
e114e473 CS |
655 | } |
656 | ||
676dac4b CS |
657 | /* |
658 | * BPRM hooks | |
659 | */ | |
660 | ||
ce8a4321 CS |
661 | /** |
662 | * smack_bprm_set_creds - set creds for exec | |
663 | * @bprm: the exec information | |
664 | * | |
5663884c | 665 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 666 | */ |
676dac4b CS |
667 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
668 | { | |
496ad9aa | 669 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 670 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 671 | struct inode_smack *isp; |
676dac4b CS |
672 | int rc; |
673 | ||
674 | rc = cap_bprm_set_creds(bprm); | |
675 | if (rc != 0) | |
676 | return rc; | |
677 | ||
678 | if (bprm->cred_prepared) | |
679 | return 0; | |
680 | ||
84088ba2 JS |
681 | isp = inode->i_security; |
682 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
683 | return 0; |
684 | ||
5663884c LP |
685 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
686 | struct task_struct *tracer; | |
687 | rc = 0; | |
688 | ||
689 | rcu_read_lock(); | |
690 | tracer = ptrace_parent(current); | |
691 | if (likely(tracer != NULL)) | |
692 | rc = smk_ptrace_rule_check(tracer, | |
693 | isp->smk_task->smk_known, | |
694 | PTRACE_MODE_ATTACH, | |
695 | __func__); | |
696 | rcu_read_unlock(); | |
697 | ||
698 | if (rc != 0) | |
699 | return rc; | |
700 | } else if (bprm->unsafe) | |
84088ba2 | 701 | return -EPERM; |
676dac4b | 702 | |
84088ba2 JS |
703 | bsp->smk_task = isp->smk_task; |
704 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 705 | |
84088ba2 JS |
706 | return 0; |
707 | } | |
676dac4b | 708 | |
84088ba2 JS |
709 | /** |
710 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
711 | * from bprm. | |
712 | * | |
713 | * @bprm: binprm for exec | |
714 | */ | |
715 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
716 | { | |
717 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 718 | |
84088ba2 JS |
719 | if (bsp->smk_task != bsp->smk_forked) |
720 | current->pdeath_signal = 0; | |
721 | } | |
722 | ||
723 | /** | |
724 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
725 | * @bprm: binprm for exec | |
726 | * | |
727 | * Returns 0 on success. | |
728 | */ | |
729 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
730 | { | |
731 | struct task_smack *tsp = current_security(); | |
732 | int ret = cap_bprm_secureexec(bprm); | |
733 | ||
734 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
735 | ret = 1; | |
736 | ||
737 | return ret; | |
676dac4b CS |
738 | } |
739 | ||
e114e473 CS |
740 | /* |
741 | * Inode hooks | |
742 | */ | |
743 | ||
744 | /** | |
745 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 746 | * @inode: the inode in need of a blob |
e114e473 CS |
747 | * |
748 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
749 | */ | |
750 | static int smack_inode_alloc_security(struct inode *inode) | |
751 | { | |
2f823ff8 CS |
752 | struct smack_known *skp = smk_of_current(); |
753 | ||
754 | inode->i_security = new_inode_smack(skp->smk_known); | |
e114e473 CS |
755 | if (inode->i_security == NULL) |
756 | return -ENOMEM; | |
757 | return 0; | |
758 | } | |
759 | ||
760 | /** | |
761 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 762 | * @inode: the inode with a blob |
e114e473 CS |
763 | * |
764 | * Clears the blob pointer in inode | |
765 | */ | |
766 | static void smack_inode_free_security(struct inode *inode) | |
767 | { | |
768 | kfree(inode->i_security); | |
769 | inode->i_security = NULL; | |
770 | } | |
771 | ||
772 | /** | |
773 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
774 | * @inode: the newly created inode |
775 | * @dir: containing directory object | |
2a7dba39 | 776 | * @qstr: unused |
e114e473 CS |
777 | * @name: where to put the attribute name |
778 | * @value: where to put the attribute value | |
779 | * @len: where to put the length of the attribute | |
780 | * | |
781 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
782 | */ | |
783 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 784 | const struct qstr *qstr, const char **name, |
2a7dba39 | 785 | void **value, size_t *len) |
e114e473 | 786 | { |
2267b13a | 787 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 788 | struct smack_known *skp = smk_of_current(); |
e114e473 | 789 | char *isp = smk_of_inode(inode); |
5c6d1125 | 790 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 791 | int may; |
e114e473 | 792 | |
9548906b TH |
793 | if (name) |
794 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 CS |
795 | |
796 | if (value) { | |
7898e1f8 | 797 | rcu_read_lock(); |
2f823ff8 | 798 | may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules); |
7898e1f8 | 799 | rcu_read_unlock(); |
5c6d1125 JS |
800 | |
801 | /* | |
802 | * If the access rule allows transmutation and | |
803 | * the directory requests transmutation then | |
804 | * by all means transmute. | |
2267b13a | 805 | * Mark the inode as changed. |
5c6d1125 | 806 | */ |
7898e1f8 | 807 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 808 | smk_inode_transmutable(dir)) { |
5c6d1125 | 809 | isp = dsp; |
2267b13a CS |
810 | issp->smk_flags |= SMK_INODE_CHANGED; |
811 | } | |
5c6d1125 | 812 | |
ceffec55 | 813 | *value = kstrdup(isp, GFP_NOFS); |
e114e473 CS |
814 | if (*value == NULL) |
815 | return -ENOMEM; | |
816 | } | |
817 | ||
818 | if (len) | |
da1b6356 | 819 | *len = strlen(isp); |
e114e473 CS |
820 | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /** | |
825 | * smack_inode_link - Smack check on link | |
826 | * @old_dentry: the existing object | |
827 | * @dir: unused | |
828 | * @new_dentry: the new object | |
829 | * | |
830 | * Returns 0 if access is permitted, an error code otherwise | |
831 | */ | |
832 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
833 | struct dentry *new_dentry) | |
834 | { | |
e114e473 | 835 | char *isp; |
ecfcc53f EB |
836 | struct smk_audit_info ad; |
837 | int rc; | |
838 | ||
a269434d | 839 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 840 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
841 | |
842 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 843 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
d166c802 | 844 | rc = smk_bu_inode(old_dentry->d_inode, MAY_WRITE, rc); |
e114e473 CS |
845 | |
846 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
847 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
848 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
849 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
d166c802 | 850 | rc = smk_bu_inode(new_dentry->d_inode, MAY_WRITE, rc); |
e114e473 CS |
851 | } |
852 | ||
853 | return rc; | |
854 | } | |
855 | ||
856 | /** | |
857 | * smack_inode_unlink - Smack check on inode deletion | |
858 | * @dir: containing directory object | |
859 | * @dentry: file to unlink | |
860 | * | |
861 | * Returns 0 if current can write the containing directory | |
862 | * and the object, error code otherwise | |
863 | */ | |
864 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
865 | { | |
866 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 867 | struct smk_audit_info ad; |
e114e473 CS |
868 | int rc; |
869 | ||
a269434d | 870 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
871 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
872 | ||
e114e473 CS |
873 | /* |
874 | * You need write access to the thing you're unlinking | |
875 | */ | |
ecfcc53f | 876 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 877 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 878 | if (rc == 0) { |
e114e473 CS |
879 | /* |
880 | * You also need write access to the containing directory | |
881 | */ | |
cdb56b60 | 882 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
883 | smk_ad_setfield_u_fs_inode(&ad, dir); |
884 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 885 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 886 | } |
e114e473 CS |
887 | return rc; |
888 | } | |
889 | ||
890 | /** | |
891 | * smack_inode_rmdir - Smack check on directory deletion | |
892 | * @dir: containing directory object | |
893 | * @dentry: directory to unlink | |
894 | * | |
895 | * Returns 0 if current can write the containing directory | |
896 | * and the directory, error code otherwise | |
897 | */ | |
898 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
899 | { | |
ecfcc53f | 900 | struct smk_audit_info ad; |
e114e473 CS |
901 | int rc; |
902 | ||
a269434d | 903 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
904 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
905 | ||
e114e473 CS |
906 | /* |
907 | * You need write access to the thing you're removing | |
908 | */ | |
ecfcc53f | 909 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 | 910 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
ecfcc53f | 911 | if (rc == 0) { |
e114e473 CS |
912 | /* |
913 | * You also need write access to the containing directory | |
914 | */ | |
cdb56b60 | 915 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
916 | smk_ad_setfield_u_fs_inode(&ad, dir); |
917 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 918 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 919 | } |
e114e473 CS |
920 | |
921 | return rc; | |
922 | } | |
923 | ||
924 | /** | |
925 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
926 | * @old_inode: unused |
927 | * @old_dentry: the old object | |
928 | * @new_inode: unused | |
929 | * @new_dentry: the new object | |
e114e473 CS |
930 | * |
931 | * Read and write access is required on both the old and | |
932 | * new directories. | |
933 | * | |
934 | * Returns 0 if access is permitted, an error code otherwise | |
935 | */ | |
936 | static int smack_inode_rename(struct inode *old_inode, | |
937 | struct dentry *old_dentry, | |
938 | struct inode *new_inode, | |
939 | struct dentry *new_dentry) | |
940 | { | |
941 | int rc; | |
942 | char *isp; | |
ecfcc53f EB |
943 | struct smk_audit_info ad; |
944 | ||
a269434d | 945 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 946 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
947 | |
948 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 949 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
d166c802 | 950 | rc = smk_bu_inode(old_dentry->d_inode, MAY_READWRITE, rc); |
e114e473 CS |
951 | |
952 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
953 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
954 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
955 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
d166c802 | 956 | rc = smk_bu_inode(new_dentry->d_inode, MAY_READWRITE, rc); |
e114e473 | 957 | } |
e114e473 CS |
958 | return rc; |
959 | } | |
960 | ||
961 | /** | |
962 | * smack_inode_permission - Smack version of permission() | |
963 | * @inode: the inode in question | |
964 | * @mask: the access requested | |
e114e473 CS |
965 | * |
966 | * This is the important Smack hook. | |
967 | * | |
968 | * Returns 0 if access is permitted, -EACCES otherwise | |
969 | */ | |
e74f71eb | 970 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 971 | { |
ecfcc53f | 972 | struct smk_audit_info ad; |
e74f71eb | 973 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 974 | int rc; |
d09ca739 EP |
975 | |
976 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
977 | /* |
978 | * No permission to check. Existence test. Yup, it's there. | |
979 | */ | |
980 | if (mask == 0) | |
981 | return 0; | |
8c9e80ed AK |
982 | |
983 | /* May be droppable after audit */ | |
e74f71eb | 984 | if (no_block) |
8c9e80ed | 985 | return -ECHILD; |
f48b7399 | 986 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 987 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
988 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
989 | rc = smk_bu_inode(inode, mask, rc); | |
990 | return rc; | |
e114e473 CS |
991 | } |
992 | ||
993 | /** | |
994 | * smack_inode_setattr - Smack check for setting attributes | |
995 | * @dentry: the object | |
996 | * @iattr: for the force flag | |
997 | * | |
998 | * Returns 0 if access is permitted, an error code otherwise | |
999 | */ | |
1000 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1001 | { | |
ecfcc53f | 1002 | struct smk_audit_info ad; |
d166c802 CS |
1003 | int rc; |
1004 | ||
e114e473 CS |
1005 | /* |
1006 | * Need to allow for clearing the setuid bit. | |
1007 | */ | |
1008 | if (iattr->ia_valid & ATTR_FORCE) | |
1009 | return 0; | |
a269434d | 1010 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1011 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1012 | |
d166c802 CS |
1013 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
1014 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); | |
1015 | return rc; | |
e114e473 CS |
1016 | } |
1017 | ||
1018 | /** | |
1019 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1020 | * @mnt: vfsmount of the object |
e114e473 CS |
1021 | * @dentry: the object |
1022 | * | |
1023 | * Returns 0 if access is permitted, an error code otherwise | |
1024 | */ | |
1025 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
1026 | { | |
ecfcc53f | 1027 | struct smk_audit_info ad; |
a269434d | 1028 | struct path path; |
d166c802 | 1029 | int rc; |
ecfcc53f | 1030 | |
a269434d EP |
1031 | path.dentry = dentry; |
1032 | path.mnt = mnt; | |
ecfcc53f | 1033 | |
f48b7399 | 1034 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 1035 | smk_ad_setfield_u_fs_path(&ad, path); |
d166c802 CS |
1036 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
1037 | rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc); | |
1038 | return rc; | |
e114e473 CS |
1039 | } |
1040 | ||
1041 | /** | |
1042 | * smack_inode_setxattr - Smack check for setting xattrs | |
1043 | * @dentry: the object | |
1044 | * @name: name of the attribute | |
e95ef49b LP |
1045 | * @value: value of the attribute |
1046 | * @size: size of the value | |
e114e473 CS |
1047 | * @flags: unused |
1048 | * | |
1049 | * This protects the Smack attribute explicitly. | |
1050 | * | |
1051 | * Returns 0 if access is permitted, an error code otherwise | |
1052 | */ | |
8f0cfa52 DH |
1053 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1054 | const void *value, size_t size, int flags) | |
e114e473 | 1055 | { |
ecfcc53f | 1056 | struct smk_audit_info ad; |
19760ad0 CS |
1057 | struct smack_known *skp; |
1058 | int check_priv = 0; | |
1059 | int check_import = 0; | |
1060 | int check_star = 0; | |
bcdca225 | 1061 | int rc = 0; |
e114e473 | 1062 | |
19760ad0 CS |
1063 | /* |
1064 | * Check label validity here so import won't fail in post_setxattr | |
1065 | */ | |
bcdca225 CS |
1066 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1067 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1068 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1069 | check_priv = 1; | |
1070 | check_import = 1; | |
1071 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1072 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1073 | check_priv = 1; | |
1074 | check_import = 1; | |
1075 | check_star = 1; | |
5c6d1125 | 1076 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1077 | check_priv = 1; |
5c6d1125 JS |
1078 | if (size != TRANS_TRUE_SIZE || |
1079 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1080 | rc = -EINVAL; | |
bcdca225 CS |
1081 | } else |
1082 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1083 | ||
19760ad0 CS |
1084 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1085 | rc = -EPERM; | |
1086 | ||
1087 | if (rc == 0 && check_import) { | |
b862e561 | 1088 | skp = size ? smk_import_entry(value, size) : NULL; |
19760ad0 CS |
1089 | if (skp == NULL || (check_star && |
1090 | (skp == &smack_known_star || skp == &smack_known_web))) | |
1091 | rc = -EINVAL; | |
1092 | } | |
1093 | ||
a269434d | 1094 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1095 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1096 | ||
d166c802 | 1097 | if (rc == 0) { |
ecfcc53f | 1098 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 CS |
1099 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
1100 | } | |
bcdca225 CS |
1101 | |
1102 | return rc; | |
e114e473 CS |
1103 | } |
1104 | ||
1105 | /** | |
1106 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1107 | * @dentry: object | |
1108 | * @name: attribute name | |
1109 | * @value: attribute value | |
1110 | * @size: attribute size | |
1111 | * @flags: unused | |
1112 | * | |
1113 | * Set the pointer in the inode blob to the entry found | |
1114 | * in the master label list. | |
1115 | */ | |
8f0cfa52 DH |
1116 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1117 | const void *value, size_t size, int flags) | |
e114e473 | 1118 | { |
2f823ff8 | 1119 | struct smack_known *skp; |
5c6d1125 | 1120 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b | 1121 | |
2f823ff8 CS |
1122 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1123 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1124 | return; | |
1125 | } | |
1126 | ||
676dac4b | 1127 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1128 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
1129 | if (skp != NULL) |
1130 | isp->smk_inode = skp->smk_known; | |
676dac4b CS |
1131 | else |
1132 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 | 1133 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1134 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
1135 | if (skp != NULL) |
1136 | isp->smk_task = skp; | |
676dac4b | 1137 | else |
2f823ff8 | 1138 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 1139 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1140 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
1141 | if (skp != NULL) |
1142 | isp->smk_mmap = skp; | |
7898e1f8 | 1143 | else |
2f823ff8 CS |
1144 | isp->smk_mmap = &smack_known_invalid; |
1145 | } | |
e114e473 CS |
1146 | |
1147 | return; | |
1148 | } | |
1149 | ||
ce8a4321 | 1150 | /** |
e114e473 CS |
1151 | * smack_inode_getxattr - Smack check on getxattr |
1152 | * @dentry: the object | |
1153 | * @name: unused | |
1154 | * | |
1155 | * Returns 0 if access is permitted, an error code otherwise | |
1156 | */ | |
8f0cfa52 | 1157 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1158 | { |
ecfcc53f | 1159 | struct smk_audit_info ad; |
d166c802 | 1160 | int rc; |
ecfcc53f | 1161 | |
a269434d | 1162 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1163 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1164 | ||
d166c802 CS |
1165 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
1166 | rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc); | |
1167 | return rc; | |
e114e473 CS |
1168 | } |
1169 | ||
ce8a4321 | 1170 | /** |
e114e473 CS |
1171 | * smack_inode_removexattr - Smack check on removexattr |
1172 | * @dentry: the object | |
1173 | * @name: name of the attribute | |
1174 | * | |
1175 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1176 | * | |
1177 | * Returns 0 if access is permitted, an error code otherwise | |
1178 | */ | |
8f0cfa52 | 1179 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1180 | { |
676dac4b | 1181 | struct inode_smack *isp; |
ecfcc53f | 1182 | struct smk_audit_info ad; |
bcdca225 | 1183 | int rc = 0; |
e114e473 | 1184 | |
bcdca225 CS |
1185 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1186 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1187 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1188 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1189 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1190 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1191 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1192 | rc = -EPERM; |
1193 | } else | |
1194 | rc = cap_inode_removexattr(dentry, name); | |
1195 | ||
f59bdfba CS |
1196 | if (rc != 0) |
1197 | return rc; | |
1198 | ||
a269434d | 1199 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1200 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1201 | |
f59bdfba | 1202 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 | 1203 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
f59bdfba CS |
1204 | if (rc != 0) |
1205 | return rc; | |
1206 | ||
1207 | isp = dentry->d_inode->i_security; | |
1208 | /* | |
1209 | * Don't do anything special for these. | |
1210 | * XATTR_NAME_SMACKIPIN | |
1211 | * XATTR_NAME_SMACKIPOUT | |
1212 | * XATTR_NAME_SMACKEXEC | |
1213 | */ | |
1214 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
676dac4b | 1215 | isp->smk_task = NULL; |
f59bdfba | 1216 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1217 | isp->smk_mmap = NULL; |
f59bdfba CS |
1218 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1219 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1220 | |
f59bdfba | 1221 | return 0; |
e114e473 CS |
1222 | } |
1223 | ||
1224 | /** | |
1225 | * smack_inode_getsecurity - get smack xattrs | |
1226 | * @inode: the object | |
1227 | * @name: attribute name | |
1228 | * @buffer: where to put the result | |
251a2a95 | 1229 | * @alloc: unused |
e114e473 CS |
1230 | * |
1231 | * Returns the size of the attribute or an error code | |
1232 | */ | |
1233 | static int smack_inode_getsecurity(const struct inode *inode, | |
1234 | const char *name, void **buffer, | |
1235 | bool alloc) | |
1236 | { | |
1237 | struct socket_smack *ssp; | |
1238 | struct socket *sock; | |
1239 | struct super_block *sbp; | |
1240 | struct inode *ip = (struct inode *)inode; | |
1241 | char *isp; | |
1242 | int ilen; | |
1243 | int rc = 0; | |
1244 | ||
1245 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1246 | isp = smk_of_inode(inode); | |
da1b6356 | 1247 | ilen = strlen(isp); |
e114e473 CS |
1248 | *buffer = isp; |
1249 | return ilen; | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * The rest of the Smack xattrs are only on sockets. | |
1254 | */ | |
1255 | sbp = ip->i_sb; | |
1256 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1257 | return -EOPNOTSUPP; | |
1258 | ||
1259 | sock = SOCKET_I(ip); | |
2e1d146a | 1260 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1261 | return -EOPNOTSUPP; |
1262 | ||
1263 | ssp = sock->sk->sk_security; | |
1264 | ||
1265 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 1266 | isp = ssp->smk_in->smk_known; |
e114e473 | 1267 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
2f823ff8 | 1268 | isp = ssp->smk_out->smk_known; |
e114e473 CS |
1269 | else |
1270 | return -EOPNOTSUPP; | |
1271 | ||
da1b6356 | 1272 | ilen = strlen(isp); |
e114e473 CS |
1273 | if (rc == 0) { |
1274 | *buffer = isp; | |
1275 | rc = ilen; | |
1276 | } | |
1277 | ||
1278 | return rc; | |
1279 | } | |
1280 | ||
1281 | ||
1282 | /** | |
1283 | * smack_inode_listsecurity - list the Smack attributes | |
1284 | * @inode: the object | |
1285 | * @buffer: where they go | |
1286 | * @buffer_size: size of buffer | |
1287 | * | |
1288 | * Returns 0 on success, -EINVAL otherwise | |
1289 | */ | |
1290 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1291 | size_t buffer_size) | |
1292 | { | |
fd5c9d23 | 1293 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1294 | |
fd5c9d23 | 1295 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1296 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1297 | |
1298 | return len; | |
e114e473 CS |
1299 | } |
1300 | ||
d20bdda6 AD |
1301 | /** |
1302 | * smack_inode_getsecid - Extract inode's security id | |
1303 | * @inode: inode to extract the info from | |
1304 | * @secid: where result will be saved | |
1305 | */ | |
1306 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1307 | { | |
1308 | struct inode_smack *isp = inode->i_security; | |
1309 | ||
1310 | *secid = smack_to_secid(isp->smk_inode); | |
1311 | } | |
1312 | ||
e114e473 CS |
1313 | /* |
1314 | * File Hooks | |
1315 | */ | |
1316 | ||
1317 | /** | |
1318 | * smack_file_permission - Smack check on file operations | |
1319 | * @file: unused | |
1320 | * @mask: unused | |
1321 | * | |
1322 | * Returns 0 | |
1323 | * | |
1324 | * Should access checks be done on each read or write? | |
1325 | * UNICOS and SELinux say yes. | |
1326 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1327 | * | |
1328 | * I'll say no for now. Smack does not do the frequent | |
1329 | * label changing that SELinux does. | |
1330 | */ | |
1331 | static int smack_file_permission(struct file *file, int mask) | |
1332 | { | |
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | /** | |
1337 | * smack_file_alloc_security - assign a file security blob | |
1338 | * @file: the object | |
1339 | * | |
1340 | * The security blob for a file is a pointer to the master | |
1341 | * label list, so no allocation is done. | |
1342 | * | |
1343 | * Returns 0 | |
1344 | */ | |
1345 | static int smack_file_alloc_security(struct file *file) | |
1346 | { | |
2f823ff8 CS |
1347 | struct smack_known *skp = smk_of_current(); |
1348 | ||
1349 | file->f_security = skp->smk_known; | |
e114e473 CS |
1350 | return 0; |
1351 | } | |
1352 | ||
1353 | /** | |
1354 | * smack_file_free_security - clear a file security blob | |
1355 | * @file: the object | |
1356 | * | |
1357 | * The security blob for a file is a pointer to the master | |
1358 | * label list, so no memory is freed. | |
1359 | */ | |
1360 | static void smack_file_free_security(struct file *file) | |
1361 | { | |
1362 | file->f_security = NULL; | |
1363 | } | |
1364 | ||
1365 | /** | |
1366 | * smack_file_ioctl - Smack check on ioctls | |
1367 | * @file: the object | |
1368 | * @cmd: what to do | |
1369 | * @arg: unused | |
1370 | * | |
1371 | * Relies heavily on the correct use of the ioctl command conventions. | |
1372 | * | |
1373 | * Returns 0 if allowed, error code otherwise | |
1374 | */ | |
1375 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1376 | unsigned long arg) | |
1377 | { | |
1378 | int rc = 0; | |
ecfcc53f EB |
1379 | struct smk_audit_info ad; |
1380 | ||
f48b7399 | 1381 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1382 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1383 | |
d166c802 | 1384 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
ecfcc53f | 1385 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
d166c802 CS |
1386 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1387 | } | |
e114e473 | 1388 | |
d166c802 | 1389 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
ecfcc53f | 1390 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
d166c802 CS |
1391 | rc = smk_bu_file(file, MAY_READ, rc); |
1392 | } | |
e114e473 CS |
1393 | |
1394 | return rc; | |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * smack_file_lock - Smack check on file locking | |
1399 | * @file: the object | |
251a2a95 | 1400 | * @cmd: unused |
e114e473 | 1401 | * |
c0ab6e56 | 1402 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1403 | */ |
1404 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1405 | { | |
ecfcc53f | 1406 | struct smk_audit_info ad; |
d166c802 | 1407 | int rc; |
ecfcc53f | 1408 | |
92f42509 EP |
1409 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1410 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
d166c802 CS |
1411 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); |
1412 | rc = smk_bu_file(file, MAY_LOCK, rc); | |
1413 | return rc; | |
e114e473 CS |
1414 | } |
1415 | ||
1416 | /** | |
1417 | * smack_file_fcntl - Smack check on fcntl | |
1418 | * @file: the object | |
1419 | * @cmd: what action to check | |
1420 | * @arg: unused | |
1421 | * | |
531f1d45 CS |
1422 | * Generally these operations are harmless. |
1423 | * File locking operations present an obvious mechanism | |
1424 | * for passing information, so they require write access. | |
1425 | * | |
e114e473 CS |
1426 | * Returns 0 if current has access, error code otherwise |
1427 | */ | |
1428 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1429 | unsigned long arg) | |
1430 | { | |
ecfcc53f | 1431 | struct smk_audit_info ad; |
531f1d45 | 1432 | int rc = 0; |
e114e473 | 1433 | |
ecfcc53f | 1434 | |
e114e473 | 1435 | switch (cmd) { |
e114e473 | 1436 | case F_GETLK: |
c0ab6e56 | 1437 | break; |
e114e473 CS |
1438 | case F_SETLK: |
1439 | case F_SETLKW: | |
c0ab6e56 CS |
1440 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1441 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1442 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); | |
d166c802 | 1443 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1444 | break; |
e114e473 CS |
1445 | case F_SETOWN: |
1446 | case F_SETSIG: | |
531f1d45 CS |
1447 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1448 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1449 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
d166c802 | 1450 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1451 | break; |
1452 | default: | |
531f1d45 | 1453 | break; |
e114e473 CS |
1454 | } |
1455 | ||
1456 | return rc; | |
1457 | } | |
1458 | ||
7898e1f8 | 1459 | /** |
e5467859 | 1460 | * smack_mmap_file : |
7898e1f8 CS |
1461 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1462 | * if mapping anonymous memory. | |
1463 | * @file contains the file structure for file to map (may be NULL). | |
1464 | * @reqprot contains the protection requested by the application. | |
1465 | * @prot contains the protection that will be applied by the kernel. | |
1466 | * @flags contains the operational flags. | |
1467 | * Return 0 if permission is granted. | |
1468 | */ | |
e5467859 | 1469 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1470 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1471 | unsigned long flags) |
7898e1f8 | 1472 | { |
272cd7a8 | 1473 | struct smack_known *skp; |
2f823ff8 | 1474 | struct smack_known *mkp; |
7898e1f8 CS |
1475 | struct smack_rule *srp; |
1476 | struct task_smack *tsp; | |
0e0a070d | 1477 | char *osmack; |
7898e1f8 | 1478 | struct inode_smack *isp; |
0e0a070d CS |
1479 | int may; |
1480 | int mmay; | |
1481 | int tmay; | |
7898e1f8 CS |
1482 | int rc; |
1483 | ||
496ad9aa | 1484 | if (file == NULL) |
7898e1f8 CS |
1485 | return 0; |
1486 | ||
496ad9aa | 1487 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1488 | if (isp->smk_mmap == NULL) |
1489 | return 0; | |
2f823ff8 | 1490 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1491 | |
1492 | tsp = current_security(); | |
2f823ff8 | 1493 | skp = smk_of_current(); |
7898e1f8 CS |
1494 | rc = 0; |
1495 | ||
1496 | rcu_read_lock(); | |
1497 | /* | |
1498 | * For each Smack rule associated with the subject | |
1499 | * label verify that the SMACK64MMAP also has access | |
1500 | * to that rule's object label. | |
7898e1f8 | 1501 | */ |
272cd7a8 | 1502 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1503 | osmack = srp->smk_object; |
7898e1f8 CS |
1504 | /* |
1505 | * Matching labels always allows access. | |
1506 | */ | |
2f823ff8 | 1507 | if (mkp->smk_known == osmack) |
7898e1f8 | 1508 | continue; |
0e0a070d CS |
1509 | /* |
1510 | * If there is a matching local rule take | |
1511 | * that into account as well. | |
1512 | */ | |
2f823ff8 | 1513 | may = smk_access_entry(srp->smk_subject->smk_known, osmack, |
0e0a070d CS |
1514 | &tsp->smk_rules); |
1515 | if (may == -ENOENT) | |
1516 | may = srp->smk_access; | |
1517 | else | |
1518 | may &= srp->smk_access; | |
1519 | /* | |
1520 | * If may is zero the SMACK64MMAP subject can't | |
1521 | * possibly have less access. | |
1522 | */ | |
1523 | if (may == 0) | |
1524 | continue; | |
1525 | ||
1526 | /* | |
1527 | * Fetch the global list entry. | |
1528 | * If there isn't one a SMACK64MMAP subject | |
1529 | * can't have as much access as current. | |
1530 | */ | |
2f823ff8 CS |
1531 | mmay = smk_access_entry(mkp->smk_known, osmack, |
1532 | &mkp->smk_rules); | |
0e0a070d CS |
1533 | if (mmay == -ENOENT) { |
1534 | rc = -EACCES; | |
1535 | break; | |
1536 | } | |
1537 | /* | |
1538 | * If there is a local entry it modifies the | |
1539 | * potential access, too. | |
1540 | */ | |
2f823ff8 CS |
1541 | tmay = smk_access_entry(mkp->smk_known, osmack, |
1542 | &tsp->smk_rules); | |
0e0a070d CS |
1543 | if (tmay != -ENOENT) |
1544 | mmay &= tmay; | |
7898e1f8 | 1545 | |
0e0a070d CS |
1546 | /* |
1547 | * If there is any access available to current that is | |
1548 | * not available to a SMACK64MMAP subject | |
1549 | * deny access. | |
1550 | */ | |
75a25637 | 1551 | if ((may | mmay) != mmay) { |
0e0a070d | 1552 | rc = -EACCES; |
7898e1f8 | 1553 | break; |
0e0a070d | 1554 | } |
7898e1f8 CS |
1555 | } |
1556 | ||
1557 | rcu_read_unlock(); | |
1558 | ||
1559 | return rc; | |
1560 | } | |
1561 | ||
e114e473 CS |
1562 | /** |
1563 | * smack_file_set_fowner - set the file security blob value | |
1564 | * @file: object in question | |
1565 | * | |
1566 | * Returns 0 | |
1567 | * Further research may be required on this one. | |
1568 | */ | |
1569 | static int smack_file_set_fowner(struct file *file) | |
1570 | { | |
2f823ff8 CS |
1571 | struct smack_known *skp = smk_of_current(); |
1572 | ||
1573 | file->f_security = skp->smk_known; | |
e114e473 CS |
1574 | return 0; |
1575 | } | |
1576 | ||
1577 | /** | |
1578 | * smack_file_send_sigiotask - Smack on sigio | |
1579 | * @tsk: The target task | |
1580 | * @fown: the object the signal come from | |
1581 | * @signum: unused | |
1582 | * | |
1583 | * Allow a privileged task to get signals even if it shouldn't | |
1584 | * | |
1585 | * Returns 0 if a subject with the object's smack could | |
1586 | * write to the task, an error code otherwise. | |
1587 | */ | |
1588 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1589 | struct fown_struct *fown, int signum) | |
1590 | { | |
2f823ff8 CS |
1591 | struct smack_known *skp; |
1592 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1593 | struct file *file; |
1594 | int rc; | |
ecfcc53f | 1595 | struct smk_audit_info ad; |
e114e473 CS |
1596 | |
1597 | /* | |
1598 | * struct fown_struct is never outside the context of a struct file | |
1599 | */ | |
1600 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1601 | |
ecfcc53f | 1602 | /* we don't log here as rc can be overriden */ |
2f823ff8 CS |
1603 | skp = smk_find_entry(file->f_security); |
1604 | rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL); | |
d166c802 | 1605 | rc = smk_bu_note("sigiotask", skp, tkp->smk_known, MAY_WRITE, rc); |
5cd9c58f | 1606 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1607 | rc = 0; |
1608 | ||
1609 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1610 | smk_ad_setfield_u_tsk(&ad, tsk); | |
2f823ff8 | 1611 | smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1612 | return rc; |
1613 | } | |
1614 | ||
1615 | /** | |
1616 | * smack_file_receive - Smack file receive check | |
1617 | * @file: the object | |
1618 | * | |
1619 | * Returns 0 if current has access, error code otherwise | |
1620 | */ | |
1621 | static int smack_file_receive(struct file *file) | |
1622 | { | |
d166c802 | 1623 | int rc; |
e114e473 | 1624 | int may = 0; |
ecfcc53f | 1625 | struct smk_audit_info ad; |
e114e473 | 1626 | |
4482a44f | 1627 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1628 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1629 | /* |
1630 | * This code relies on bitmasks. | |
1631 | */ | |
1632 | if (file->f_mode & FMODE_READ) | |
1633 | may = MAY_READ; | |
1634 | if (file->f_mode & FMODE_WRITE) | |
1635 | may |= MAY_WRITE; | |
1636 | ||
d166c802 CS |
1637 | rc = smk_curacc(file->f_security, may, &ad); |
1638 | rc = smk_bu_file(file, may, rc); | |
1639 | return rc; | |
e114e473 CS |
1640 | } |
1641 | ||
531f1d45 | 1642 | /** |
83d49856 | 1643 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1644 | * @file: the object |
a6834c0b | 1645 | * @cred: task credential |
531f1d45 CS |
1646 | * |
1647 | * Set the security blob in the file structure. | |
a6834c0b CS |
1648 | * Allow the open only if the task has read access. There are |
1649 | * many read operations (e.g. fstat) that you can do with an | |
1650 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1651 | * |
1652 | * Returns 0 | |
1653 | */ | |
83d49856 | 1654 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1655 | { |
a6834c0b | 1656 | struct task_smack *tsp = cred->security; |
496ad9aa | 1657 | struct inode_smack *isp = file_inode(file)->i_security; |
a6834c0b CS |
1658 | struct smk_audit_info ad; |
1659 | int rc; | |
531f1d45 | 1660 | |
d83d2c26 MN |
1661 | if (smack_privileged(CAP_MAC_OVERRIDE)) { |
1662 | file->f_security = isp->smk_inode; | |
a6834c0b | 1663 | return 0; |
d83d2c26 | 1664 | } |
531f1d45 | 1665 | |
a6834c0b CS |
1666 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1667 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1668 | rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad); | |
d166c802 | 1669 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1670 | if (rc == 0) |
1671 | file->f_security = isp->smk_inode; | |
1672 | ||
1673 | return rc; | |
531f1d45 CS |
1674 | } |
1675 | ||
e114e473 CS |
1676 | /* |
1677 | * Task hooks | |
1678 | */ | |
1679 | ||
ee18d64c DH |
1680 | /** |
1681 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1682 | * @new: the new credentials | |
1683 | * @gfp: the atomicity of any memory allocations | |
1684 | * | |
1685 | * Prepare a blank set of credentials for modification. This must allocate all | |
1686 | * the memory the LSM module might require such that cred_transfer() can | |
1687 | * complete without error. | |
1688 | */ | |
1689 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1690 | { | |
7898e1f8 CS |
1691 | struct task_smack *tsp; |
1692 | ||
1693 | tsp = new_task_smack(NULL, NULL, gfp); | |
1694 | if (tsp == NULL) | |
676dac4b | 1695 | return -ENOMEM; |
7898e1f8 CS |
1696 | |
1697 | cred->security = tsp; | |
1698 | ||
ee18d64c DH |
1699 | return 0; |
1700 | } | |
1701 | ||
1702 | ||
e114e473 | 1703 | /** |
f1752eec DH |
1704 | * smack_cred_free - "free" task-level security credentials |
1705 | * @cred: the credentials in question | |
e114e473 | 1706 | * |
e114e473 | 1707 | */ |
f1752eec | 1708 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1709 | { |
7898e1f8 CS |
1710 | struct task_smack *tsp = cred->security; |
1711 | struct smack_rule *rp; | |
1712 | struct list_head *l; | |
1713 | struct list_head *n; | |
1714 | ||
1715 | if (tsp == NULL) | |
1716 | return; | |
1717 | cred->security = NULL; | |
1718 | ||
1719 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1720 | rp = list_entry(l, struct smack_rule, list); | |
1721 | list_del(&rp->list); | |
1722 | kfree(rp); | |
1723 | } | |
1724 | kfree(tsp); | |
e114e473 CS |
1725 | } |
1726 | ||
d84f4f99 DH |
1727 | /** |
1728 | * smack_cred_prepare - prepare new set of credentials for modification | |
1729 | * @new: the new credentials | |
1730 | * @old: the original credentials | |
1731 | * @gfp: the atomicity of any memory allocations | |
1732 | * | |
1733 | * Prepare a new set of credentials for modification. | |
1734 | */ | |
1735 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1736 | gfp_t gfp) | |
1737 | { | |
676dac4b CS |
1738 | struct task_smack *old_tsp = old->security; |
1739 | struct task_smack *new_tsp; | |
7898e1f8 | 1740 | int rc; |
676dac4b | 1741 | |
7898e1f8 | 1742 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1743 | if (new_tsp == NULL) |
1744 | return -ENOMEM; | |
1745 | ||
7898e1f8 CS |
1746 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1747 | if (rc != 0) | |
1748 | return rc; | |
1749 | ||
676dac4b | 1750 | new->security = new_tsp; |
d84f4f99 DH |
1751 | return 0; |
1752 | } | |
1753 | ||
ee18d64c DH |
1754 | /** |
1755 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1756 | * @new: the new credentials | |
1757 | * @old: the original credentials | |
1758 | * | |
1759 | * Fill in a set of blank credentials from another set of credentials. | |
1760 | */ | |
1761 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1762 | { | |
676dac4b CS |
1763 | struct task_smack *old_tsp = old->security; |
1764 | struct task_smack *new_tsp = new->security; | |
1765 | ||
1766 | new_tsp->smk_task = old_tsp->smk_task; | |
1767 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1768 | mutex_init(&new_tsp->smk_rules_lock); |
1769 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1770 | ||
1771 | ||
1772 | /* cbs copy rule list */ | |
ee18d64c DH |
1773 | } |
1774 | ||
3a3b7ce9 DH |
1775 | /** |
1776 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1777 | * @new: points to the set of credentials to be modified. |
1778 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1779 | * |
1780 | * Set the security data for a kernel service. | |
1781 | */ | |
1782 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1783 | { | |
676dac4b | 1784 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1785 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1786 | |
2f823ff8 | 1787 | if (skp == NULL) |
3a3b7ce9 DH |
1788 | return -EINVAL; |
1789 | ||
2f823ff8 | 1790 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1791 | return 0; |
1792 | } | |
1793 | ||
1794 | /** | |
1795 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1796 | * @new: points to the set of credentials to be modified |
1797 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1798 | * |
1799 | * Set the file creation context in a set of credentials to the same | |
1800 | * as the objective context of the specified inode | |
1801 | */ | |
1802 | static int smack_kernel_create_files_as(struct cred *new, | |
1803 | struct inode *inode) | |
1804 | { | |
1805 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1806 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1807 | |
2f823ff8 CS |
1808 | tsp->smk_forked = smk_find_entry(isp->smk_inode); |
1809 | tsp->smk_task = tsp->smk_forked; | |
3a3b7ce9 DH |
1810 | return 0; |
1811 | } | |
1812 | ||
ecfcc53f EB |
1813 | /** |
1814 | * smk_curacc_on_task - helper to log task related access | |
1815 | * @p: the task object | |
531f1d45 CS |
1816 | * @access: the access requested |
1817 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1818 | * |
1819 | * Return 0 if access is permitted | |
1820 | */ | |
531f1d45 CS |
1821 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1822 | const char *caller) | |
ecfcc53f EB |
1823 | { |
1824 | struct smk_audit_info ad; | |
2f823ff8 | 1825 | struct smack_known *skp = smk_of_task(task_security(p)); |
d166c802 | 1826 | int rc; |
ecfcc53f | 1827 | |
531f1d45 | 1828 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1829 | smk_ad_setfield_u_tsk(&ad, p); |
d166c802 CS |
1830 | rc = smk_curacc(skp->smk_known, access, &ad); |
1831 | rc = smk_bu_task(p, access, rc); | |
1832 | return rc; | |
ecfcc53f EB |
1833 | } |
1834 | ||
e114e473 CS |
1835 | /** |
1836 | * smack_task_setpgid - Smack check on setting pgid | |
1837 | * @p: the task object | |
1838 | * @pgid: unused | |
1839 | * | |
1840 | * Return 0 if write access is permitted | |
1841 | */ | |
1842 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1843 | { | |
531f1d45 | 1844 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1845 | } |
1846 | ||
1847 | /** | |
1848 | * smack_task_getpgid - Smack access check for getpgid | |
1849 | * @p: the object task | |
1850 | * | |
1851 | * Returns 0 if current can read the object task, error code otherwise | |
1852 | */ | |
1853 | static int smack_task_getpgid(struct task_struct *p) | |
1854 | { | |
531f1d45 | 1855 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1856 | } |
1857 | ||
1858 | /** | |
1859 | * smack_task_getsid - Smack access check for getsid | |
1860 | * @p: the object task | |
1861 | * | |
1862 | * Returns 0 if current can read the object task, error code otherwise | |
1863 | */ | |
1864 | static int smack_task_getsid(struct task_struct *p) | |
1865 | { | |
531f1d45 | 1866 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1867 | } |
1868 | ||
1869 | /** | |
1870 | * smack_task_getsecid - get the secid of the task | |
1871 | * @p: the object task | |
1872 | * @secid: where to put the result | |
1873 | * | |
1874 | * Sets the secid to contain a u32 version of the smack label. | |
1875 | */ | |
1876 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1877 | { | |
2f823ff8 CS |
1878 | struct smack_known *skp = smk_of_task(task_security(p)); |
1879 | ||
1880 | *secid = skp->smk_secid; | |
e114e473 CS |
1881 | } |
1882 | ||
1883 | /** | |
1884 | * smack_task_setnice - Smack check on setting nice | |
1885 | * @p: the task object | |
1886 | * @nice: unused | |
1887 | * | |
1888 | * Return 0 if write access is permitted | |
1889 | */ | |
1890 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1891 | { | |
bcdca225 CS |
1892 | int rc; |
1893 | ||
1894 | rc = cap_task_setnice(p, nice); | |
1895 | if (rc == 0) | |
531f1d45 | 1896 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1897 | return rc; |
e114e473 CS |
1898 | } |
1899 | ||
1900 | /** | |
1901 | * smack_task_setioprio - Smack check on setting ioprio | |
1902 | * @p: the task object | |
1903 | * @ioprio: unused | |
1904 | * | |
1905 | * Return 0 if write access is permitted | |
1906 | */ | |
1907 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1908 | { | |
bcdca225 CS |
1909 | int rc; |
1910 | ||
1911 | rc = cap_task_setioprio(p, ioprio); | |
1912 | if (rc == 0) | |
531f1d45 | 1913 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1914 | return rc; |
e114e473 CS |
1915 | } |
1916 | ||
1917 | /** | |
1918 | * smack_task_getioprio - Smack check on reading ioprio | |
1919 | * @p: the task object | |
1920 | * | |
1921 | * Return 0 if read access is permitted | |
1922 | */ | |
1923 | static int smack_task_getioprio(struct task_struct *p) | |
1924 | { | |
531f1d45 | 1925 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1926 | } |
1927 | ||
1928 | /** | |
1929 | * smack_task_setscheduler - Smack check on setting scheduler | |
1930 | * @p: the task object | |
1931 | * @policy: unused | |
1932 | * @lp: unused | |
1933 | * | |
1934 | * Return 0 if read access is permitted | |
1935 | */ | |
b0ae1981 | 1936 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1937 | { |
bcdca225 CS |
1938 | int rc; |
1939 | ||
b0ae1981 | 1940 | rc = cap_task_setscheduler(p); |
bcdca225 | 1941 | if (rc == 0) |
531f1d45 | 1942 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1943 | return rc; |
e114e473 CS |
1944 | } |
1945 | ||
1946 | /** | |
1947 | * smack_task_getscheduler - Smack check on reading scheduler | |
1948 | * @p: the task object | |
1949 | * | |
1950 | * Return 0 if read access is permitted | |
1951 | */ | |
1952 | static int smack_task_getscheduler(struct task_struct *p) | |
1953 | { | |
531f1d45 | 1954 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1955 | } |
1956 | ||
1957 | /** | |
1958 | * smack_task_movememory - Smack check on moving memory | |
1959 | * @p: the task object | |
1960 | * | |
1961 | * Return 0 if write access is permitted | |
1962 | */ | |
1963 | static int smack_task_movememory(struct task_struct *p) | |
1964 | { | |
531f1d45 | 1965 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1966 | } |
1967 | ||
1968 | /** | |
1969 | * smack_task_kill - Smack check on signal delivery | |
1970 | * @p: the task object | |
1971 | * @info: unused | |
1972 | * @sig: unused | |
1973 | * @secid: identifies the smack to use in lieu of current's | |
1974 | * | |
1975 | * Return 0 if write access is permitted | |
1976 | * | |
1977 | * The secid behavior is an artifact of an SELinux hack | |
1978 | * in the USB code. Someday it may go away. | |
1979 | */ | |
1980 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1981 | int sig, u32 secid) | |
1982 | { | |
ecfcc53f | 1983 | struct smk_audit_info ad; |
2f823ff8 CS |
1984 | struct smack_known *skp; |
1985 | struct smack_known *tkp = smk_of_task(task_security(p)); | |
d166c802 | 1986 | int rc; |
ecfcc53f EB |
1987 | |
1988 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1989 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1990 | /* |
1991 | * Sending a signal requires that the sender | |
1992 | * can write the receiver. | |
1993 | */ | |
d166c802 CS |
1994 | if (secid == 0) { |
1995 | rc = smk_curacc(tkp->smk_known, MAY_WRITE, &ad); | |
1996 | rc = smk_bu_task(p, MAY_WRITE, rc); | |
1997 | return rc; | |
1998 | } | |
e114e473 CS |
1999 | /* |
2000 | * If the secid isn't 0 we're dealing with some USB IO | |
2001 | * specific behavior. This is not clean. For one thing | |
2002 | * we can't take privilege into account. | |
2003 | */ | |
2f823ff8 | 2004 | skp = smack_from_secid(secid); |
d166c802 CS |
2005 | rc = smk_access(skp, tkp->smk_known, MAY_WRITE, &ad); |
2006 | rc = smk_bu_note("USB signal", skp, tkp->smk_known, MAY_WRITE, rc); | |
2007 | return rc; | |
e114e473 CS |
2008 | } |
2009 | ||
2010 | /** | |
2011 | * smack_task_wait - Smack access check for waiting | |
2012 | * @p: task to wait for | |
2013 | * | |
c00bedb3 | 2014 | * Returns 0 |
e114e473 CS |
2015 | */ |
2016 | static int smack_task_wait(struct task_struct *p) | |
2017 | { | |
e114e473 | 2018 | /* |
c00bedb3 CS |
2019 | * Allow the operation to succeed. |
2020 | * Zombies are bad. | |
2021 | * In userless environments (e.g. phones) programs | |
2022 | * get marked with SMACK64EXEC and even if the parent | |
2023 | * and child shouldn't be talking the parent still | |
2024 | * may expect to know when the child exits. | |
e114e473 | 2025 | */ |
c00bedb3 | 2026 | return 0; |
e114e473 CS |
2027 | } |
2028 | ||
2029 | /** | |
2030 | * smack_task_to_inode - copy task smack into the inode blob | |
2031 | * @p: task to copy from | |
251a2a95 | 2032 | * @inode: inode to copy to |
e114e473 CS |
2033 | * |
2034 | * Sets the smack pointer in the inode security blob | |
2035 | */ | |
2036 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2037 | { | |
2038 | struct inode_smack *isp = inode->i_security; | |
2f823ff8 CS |
2039 | struct smack_known *skp = smk_of_task(task_security(p)); |
2040 | ||
2041 | isp->smk_inode = skp->smk_known; | |
e114e473 CS |
2042 | } |
2043 | ||
2044 | /* | |
2045 | * Socket hooks. | |
2046 | */ | |
2047 | ||
2048 | /** | |
2049 | * smack_sk_alloc_security - Allocate a socket blob | |
2050 | * @sk: the socket | |
2051 | * @family: unused | |
251a2a95 | 2052 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2053 | * |
2054 | * Assign Smack pointers to current | |
2055 | * | |
2056 | * Returns 0 on success, -ENOMEM is there's no memory | |
2057 | */ | |
2058 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2059 | { | |
2f823ff8 | 2060 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2061 | struct socket_smack *ssp; |
2062 | ||
2063 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2064 | if (ssp == NULL) | |
2065 | return -ENOMEM; | |
2066 | ||
54e70ec5 | 2067 | ssp->smk_in = skp; |
2f823ff8 | 2068 | ssp->smk_out = skp; |
272cd7a8 | 2069 | ssp->smk_packet = NULL; |
e114e473 CS |
2070 | |
2071 | sk->sk_security = ssp; | |
2072 | ||
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | /** | |
2077 | * smack_sk_free_security - Free a socket blob | |
2078 | * @sk: the socket | |
2079 | * | |
2080 | * Clears the blob pointer | |
2081 | */ | |
2082 | static void smack_sk_free_security(struct sock *sk) | |
2083 | { | |
2084 | kfree(sk->sk_security); | |
2085 | } | |
2086 | ||
07feee8f PM |
2087 | /** |
2088 | * smack_host_label - check host based restrictions | |
2089 | * @sip: the object end | |
2090 | * | |
2091 | * looks for host based access restrictions | |
2092 | * | |
2093 | * This version will only be appropriate for really small sets of single label | |
2094 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2095 | * taken before calling this function. | |
2096 | * | |
2097 | * Returns the label of the far end or NULL if it's not special. | |
2098 | */ | |
2099 | static char *smack_host_label(struct sockaddr_in *sip) | |
2100 | { | |
2101 | struct smk_netlbladdr *snp; | |
2102 | struct in_addr *siap = &sip->sin_addr; | |
2103 | ||
2104 | if (siap->s_addr == 0) | |
2105 | return NULL; | |
2106 | ||
2107 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
2108 | /* | |
2109 | * we break after finding the first match because | |
2110 | * the list is sorted from longest to shortest mask | |
2111 | * so we have found the most specific match | |
2112 | */ | |
2113 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
2114 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
2115 | /* we have found the special CIPSO option */ | |
2116 | if (snp->smk_label == smack_cipso_option) | |
2117 | return NULL; | |
07feee8f | 2118 | return snp->smk_label; |
4303154e | 2119 | } |
07feee8f PM |
2120 | |
2121 | return NULL; | |
2122 | } | |
2123 | ||
e114e473 CS |
2124 | /** |
2125 | * smack_netlabel - Set the secattr on a socket | |
2126 | * @sk: the socket | |
6d3dc07c | 2127 | * @labeled: socket label scheme |
e114e473 CS |
2128 | * |
2129 | * Convert the outbound smack value (smk_out) to a | |
2130 | * secattr and attach it to the socket. | |
2131 | * | |
2132 | * Returns 0 on success or an error code | |
2133 | */ | |
6d3dc07c | 2134 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2135 | { |
f7112e6c | 2136 | struct smack_known *skp; |
07feee8f | 2137 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2138 | int rc = 0; |
e114e473 | 2139 | |
6d3dc07c CS |
2140 | /* |
2141 | * Usually the netlabel code will handle changing the | |
2142 | * packet labeling based on the label. | |
2143 | * The case of a single label host is different, because | |
2144 | * a single label host should never get a labeled packet | |
2145 | * even though the label is usually associated with a packet | |
2146 | * label. | |
2147 | */ | |
2148 | local_bh_disable(); | |
2149 | bh_lock_sock_nested(sk); | |
2150 | ||
2151 | if (ssp->smk_out == smack_net_ambient || | |
2152 | labeled == SMACK_UNLABELED_SOCKET) | |
2153 | netlbl_sock_delattr(sk); | |
2154 | else { | |
2f823ff8 | 2155 | skp = ssp->smk_out; |
f7112e6c | 2156 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2157 | } |
2158 | ||
2159 | bh_unlock_sock(sk); | |
2160 | local_bh_enable(); | |
4bc87e62 | 2161 | |
e114e473 CS |
2162 | return rc; |
2163 | } | |
2164 | ||
07feee8f PM |
2165 | /** |
2166 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2167 | * @sk: the socket | |
2168 | * @sap: the destination address | |
2169 | * | |
2170 | * Set the correct secattr for the given socket based on the destination | |
2171 | * address and perform any outbound access checks needed. | |
2172 | * | |
2173 | * Returns 0 on success or an error code. | |
2174 | * | |
2175 | */ | |
2176 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2177 | { | |
2f823ff8 | 2178 | struct smack_known *skp; |
07feee8f PM |
2179 | int rc; |
2180 | int sk_lbl; | |
2181 | char *hostsp; | |
2182 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 2183 | struct smk_audit_info ad; |
07feee8f PM |
2184 | |
2185 | rcu_read_lock(); | |
2186 | hostsp = smack_host_label(sap); | |
2187 | if (hostsp != NULL) { | |
ecfcc53f | 2188 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2189 | struct lsm_network_audit net; |
2190 | ||
48c62af6 EP |
2191 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2192 | ad.a.u.net->family = sap->sin_family; | |
2193 | ad.a.u.net->dport = sap->sin_port; | |
2194 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2195 | #endif |
923e9a13 | 2196 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 CS |
2197 | skp = ssp->smk_out; |
2198 | rc = smk_access(skp, hostsp, MAY_WRITE, &ad); | |
d166c802 | 2199 | rc = smk_bu_note("IPv4 host check", skp, hostsp, MAY_WRITE, rc); |
07feee8f PM |
2200 | } else { |
2201 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2202 | rc = 0; | |
2203 | } | |
2204 | rcu_read_unlock(); | |
2205 | if (rc != 0) | |
2206 | return rc; | |
2207 | ||
2208 | return smack_netlabel(sk, sk_lbl); | |
2209 | } | |
2210 | ||
c6739443 CS |
2211 | /** |
2212 | * smk_ipv6_port_label - Smack port access table management | |
2213 | * @sock: socket | |
2214 | * @address: address | |
2215 | * | |
2216 | * Create or update the port list entry | |
2217 | */ | |
2218 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2219 | { | |
2220 | struct sock *sk = sock->sk; | |
2221 | struct sockaddr_in6 *addr6; | |
2222 | struct socket_smack *ssp = sock->sk->sk_security; | |
2223 | struct smk_port_label *spp; | |
2224 | unsigned short port = 0; | |
2225 | ||
2226 | if (address == NULL) { | |
2227 | /* | |
2228 | * This operation is changing the Smack information | |
2229 | * on the bound socket. Take the changes to the port | |
2230 | * as well. | |
2231 | */ | |
2232 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2233 | if (sk != spp->smk_sock) | |
2234 | continue; | |
2235 | spp->smk_in = ssp->smk_in; | |
2236 | spp->smk_out = ssp->smk_out; | |
2237 | return; | |
2238 | } | |
2239 | /* | |
2240 | * A NULL address is only used for updating existing | |
2241 | * bound entries. If there isn't one, it's OK. | |
2242 | */ | |
2243 | return; | |
2244 | } | |
2245 | ||
2246 | addr6 = (struct sockaddr_in6 *)address; | |
2247 | port = ntohs(addr6->sin6_port); | |
2248 | /* | |
2249 | * This is a special case that is safely ignored. | |
2250 | */ | |
2251 | if (port == 0) | |
2252 | return; | |
2253 | ||
2254 | /* | |
2255 | * Look for an existing port list entry. | |
2256 | * This is an indication that a port is getting reused. | |
2257 | */ | |
2258 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2259 | if (spp->smk_port != port) | |
2260 | continue; | |
2261 | spp->smk_port = port; | |
2262 | spp->smk_sock = sk; | |
2263 | spp->smk_in = ssp->smk_in; | |
2264 | spp->smk_out = ssp->smk_out; | |
2265 | return; | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * A new port entry is required. | |
2270 | */ | |
2271 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2272 | if (spp == NULL) | |
2273 | return; | |
2274 | ||
2275 | spp->smk_port = port; | |
2276 | spp->smk_sock = sk; | |
2277 | spp->smk_in = ssp->smk_in; | |
2278 | spp->smk_out = ssp->smk_out; | |
2279 | ||
2280 | list_add(&spp->list, &smk_ipv6_port_list); | |
2281 | return; | |
2282 | } | |
2283 | ||
2284 | /** | |
2285 | * smk_ipv6_port_check - check Smack port access | |
2286 | * @sock: socket | |
2287 | * @address: address | |
2288 | * | |
2289 | * Create or update the port list entry | |
2290 | */ | |
6ea06247 | 2291 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2292 | int act) |
2293 | { | |
2294 | __be16 *bep; | |
2295 | __be32 *be32p; | |
c6739443 CS |
2296 | struct smk_port_label *spp; |
2297 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 2298 | struct smack_known *skp; |
c6739443 | 2299 | unsigned short port = 0; |
c6739443 CS |
2300 | char *object; |
2301 | struct smk_audit_info ad; | |
d166c802 | 2302 | int rc; |
c6739443 CS |
2303 | #ifdef CONFIG_AUDIT |
2304 | struct lsm_network_audit net; | |
2305 | #endif | |
2306 | ||
2307 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2308 | skp = smack_net_ambient; |
54e70ec5 | 2309 | object = ssp->smk_in->smk_known; |
c6739443 | 2310 | } else { |
2f823ff8 CS |
2311 | skp = ssp->smk_out; |
2312 | object = smack_net_ambient->smk_known; | |
c6739443 CS |
2313 | } |
2314 | ||
2315 | /* | |
2316 | * Get the IP address and port from the address. | |
2317 | */ | |
6ea06247 CS |
2318 | port = ntohs(address->sin6_port); |
2319 | bep = (__be16 *)(&address->sin6_addr); | |
2320 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2321 | |
2322 | /* | |
2323 | * It's remote, so port lookup does no good. | |
2324 | */ | |
2325 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2326 | goto auditout; | |
2327 | ||
2328 | /* | |
2329 | * It's local so the send check has to have passed. | |
2330 | */ | |
2331 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2332 | skp = &smack_known_web; |
c6739443 CS |
2333 | goto auditout; |
2334 | } | |
2335 | ||
2336 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2337 | if (spp->smk_port != port) | |
2338 | continue; | |
54e70ec5 | 2339 | object = spp->smk_in->smk_known; |
c6739443 | 2340 | if (act == SMK_CONNECTING) |
54e70ec5 | 2341 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2342 | break; |
2343 | } | |
2344 | ||
2345 | auditout: | |
2346 | ||
2347 | #ifdef CONFIG_AUDIT | |
2348 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2349 | ad.a.u.net->family = sk->sk_family; | |
2350 | ad.a.u.net->dport = port; | |
2351 | if (act == SMK_RECEIVING) | |
6ea06247 | 2352 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2353 | else |
6ea06247 | 2354 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2355 | #endif |
d166c802 CS |
2356 | rc = smk_access(skp, object, MAY_WRITE, &ad); |
2357 | rc = smk_bu_note("IPv6 port check", skp, object, MAY_WRITE, rc); | |
2358 | return rc; | |
c6739443 CS |
2359 | } |
2360 | ||
e114e473 CS |
2361 | /** |
2362 | * smack_inode_setsecurity - set smack xattrs | |
2363 | * @inode: the object | |
2364 | * @name: attribute name | |
2365 | * @value: attribute value | |
2366 | * @size: size of the attribute | |
2367 | * @flags: unused | |
2368 | * | |
2369 | * Sets the named attribute in the appropriate blob | |
2370 | * | |
2371 | * Returns 0 on success, or an error code | |
2372 | */ | |
2373 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2374 | const void *value, size_t size, int flags) | |
2375 | { | |
2f823ff8 | 2376 | struct smack_known *skp; |
e114e473 CS |
2377 | struct inode_smack *nsp = inode->i_security; |
2378 | struct socket_smack *ssp; | |
2379 | struct socket *sock; | |
4bc87e62 | 2380 | int rc = 0; |
e114e473 | 2381 | |
f7112e6c | 2382 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2383 | return -EINVAL; |
e114e473 | 2384 | |
2f823ff8 CS |
2385 | skp = smk_import_entry(value, size); |
2386 | if (skp == NULL) | |
e114e473 CS |
2387 | return -EINVAL; |
2388 | ||
2389 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
2f823ff8 | 2390 | nsp->smk_inode = skp->smk_known; |
ddd29ec6 | 2391 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2392 | return 0; |
2393 | } | |
2394 | /* | |
2395 | * The rest of the Smack xattrs are only on sockets. | |
2396 | */ | |
2397 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2398 | return -EOPNOTSUPP; | |
2399 | ||
2400 | sock = SOCKET_I(inode); | |
2e1d146a | 2401 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2402 | return -EOPNOTSUPP; |
2403 | ||
2404 | ssp = sock->sk->sk_security; | |
2405 | ||
2406 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2407 | ssp->smk_in = skp; |
e114e473 | 2408 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2409 | ssp->smk_out = skp; |
c6739443 | 2410 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2411 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2412 | if (rc != 0) | |
2413 | printk(KERN_WARNING | |
2414 | "Smack: \"%s\" netlbl error %d.\n", | |
2415 | __func__, -rc); | |
2416 | } | |
e114e473 CS |
2417 | } else |
2418 | return -EOPNOTSUPP; | |
2419 | ||
c6739443 CS |
2420 | if (sock->sk->sk_family == PF_INET6) |
2421 | smk_ipv6_port_label(sock, NULL); | |
2422 | ||
e114e473 CS |
2423 | return 0; |
2424 | } | |
2425 | ||
2426 | /** | |
2427 | * smack_socket_post_create - finish socket setup | |
2428 | * @sock: the socket | |
2429 | * @family: protocol family | |
2430 | * @type: unused | |
2431 | * @protocol: unused | |
2432 | * @kern: unused | |
2433 | * | |
2434 | * Sets the netlabel information on the socket | |
2435 | * | |
2436 | * Returns 0 on success, and error code otherwise | |
2437 | */ | |
2438 | static int smack_socket_post_create(struct socket *sock, int family, | |
2439 | int type, int protocol, int kern) | |
2440 | { | |
2e1d146a | 2441 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2442 | return 0; |
2443 | /* | |
2444 | * Set the outbound netlbl. | |
2445 | */ | |
6d3dc07c CS |
2446 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2447 | } | |
2448 | ||
c6739443 CS |
2449 | /** |
2450 | * smack_socket_bind - record port binding information. | |
2451 | * @sock: the socket | |
2452 | * @address: the port address | |
2453 | * @addrlen: size of the address | |
2454 | * | |
2455 | * Records the label bound to a port. | |
2456 | * | |
2457 | * Returns 0 | |
2458 | */ | |
2459 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2460 | int addrlen) | |
2461 | { | |
2462 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2463 | smk_ipv6_port_label(sock, address); | |
2464 | ||
2465 | return 0; | |
2466 | } | |
2467 | ||
6d3dc07c CS |
2468 | /** |
2469 | * smack_socket_connect - connect access check | |
2470 | * @sock: the socket | |
2471 | * @sap: the other end | |
2472 | * @addrlen: size of sap | |
2473 | * | |
2474 | * Verifies that a connection may be possible | |
2475 | * | |
2476 | * Returns 0 on success, and error code otherwise | |
2477 | */ | |
2478 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2479 | int addrlen) | |
2480 | { | |
c6739443 CS |
2481 | int rc = 0; |
2482 | ||
2483 | if (sock->sk == NULL) | |
6d3dc07c | 2484 | return 0; |
6d3dc07c | 2485 | |
c6739443 CS |
2486 | switch (sock->sk->sk_family) { |
2487 | case PF_INET: | |
2488 | if (addrlen < sizeof(struct sockaddr_in)) | |
2489 | return -EINVAL; | |
2490 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2491 | break; | |
2492 | case PF_INET6: | |
2493 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2494 | return -EINVAL; | |
6ea06247 CS |
2495 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2496 | SMK_CONNECTING); | |
c6739443 CS |
2497 | break; |
2498 | } | |
2499 | return rc; | |
e114e473 CS |
2500 | } |
2501 | ||
2502 | /** | |
2503 | * smack_flags_to_may - convert S_ to MAY_ values | |
2504 | * @flags: the S_ value | |
2505 | * | |
2506 | * Returns the equivalent MAY_ value | |
2507 | */ | |
2508 | static int smack_flags_to_may(int flags) | |
2509 | { | |
2510 | int may = 0; | |
2511 | ||
2512 | if (flags & S_IRUGO) | |
2513 | may |= MAY_READ; | |
2514 | if (flags & S_IWUGO) | |
2515 | may |= MAY_WRITE; | |
2516 | if (flags & S_IXUGO) | |
2517 | may |= MAY_EXEC; | |
2518 | ||
2519 | return may; | |
2520 | } | |
2521 | ||
2522 | /** | |
2523 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2524 | * @msg: the object | |
2525 | * | |
2526 | * Returns 0 | |
2527 | */ | |
2528 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2529 | { | |
2f823ff8 CS |
2530 | struct smack_known *skp = smk_of_current(); |
2531 | ||
2532 | msg->security = skp->smk_known; | |
e114e473 CS |
2533 | return 0; |
2534 | } | |
2535 | ||
2536 | /** | |
2537 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2538 | * @msg: the object | |
2539 | * | |
2540 | * Clears the blob pointer | |
2541 | */ | |
2542 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2543 | { | |
2544 | msg->security = NULL; | |
2545 | } | |
2546 | ||
2547 | /** | |
2548 | * smack_of_shm - the smack pointer for the shm | |
2549 | * @shp: the object | |
2550 | * | |
2551 | * Returns a pointer to the smack value | |
2552 | */ | |
2553 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2554 | { | |
2555 | return (char *)shp->shm_perm.security; | |
2556 | } | |
2557 | ||
2558 | /** | |
2559 | * smack_shm_alloc_security - Set the security blob for shm | |
2560 | * @shp: the object | |
2561 | * | |
2562 | * Returns 0 | |
2563 | */ | |
2564 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2565 | { | |
2566 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2567 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2568 | |
2f823ff8 | 2569 | isp->security = skp->smk_known; |
e114e473 CS |
2570 | return 0; |
2571 | } | |
2572 | ||
2573 | /** | |
2574 | * smack_shm_free_security - Clear the security blob for shm | |
2575 | * @shp: the object | |
2576 | * | |
2577 | * Clears the blob pointer | |
2578 | */ | |
2579 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2580 | { | |
2581 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2582 | ||
2583 | isp->security = NULL; | |
2584 | } | |
2585 | ||
ecfcc53f EB |
2586 | /** |
2587 | * smk_curacc_shm : check if current has access on shm | |
2588 | * @shp : the object | |
2589 | * @access : access requested | |
2590 | * | |
2591 | * Returns 0 if current has the requested access, error code otherwise | |
2592 | */ | |
2593 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2594 | { | |
2595 | char *ssp = smack_of_shm(shp); | |
2596 | struct smk_audit_info ad; | |
d166c802 | 2597 | int rc; |
ecfcc53f EB |
2598 | |
2599 | #ifdef CONFIG_AUDIT | |
2600 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2601 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2602 | #endif | |
d166c802 CS |
2603 | rc = smk_curacc(ssp, access, &ad); |
2604 | rc = smk_bu_current("shm", ssp, access, rc); | |
2605 | return rc; | |
ecfcc53f EB |
2606 | } |
2607 | ||
e114e473 CS |
2608 | /** |
2609 | * smack_shm_associate - Smack access check for shm | |
2610 | * @shp: the object | |
2611 | * @shmflg: access requested | |
2612 | * | |
2613 | * Returns 0 if current has the requested access, error code otherwise | |
2614 | */ | |
2615 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2616 | { | |
e114e473 CS |
2617 | int may; |
2618 | ||
2619 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2620 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2621 | } |
2622 | ||
2623 | /** | |
2624 | * smack_shm_shmctl - Smack access check for shm | |
2625 | * @shp: the object | |
2626 | * @cmd: what it wants to do | |
2627 | * | |
2628 | * Returns 0 if current has the requested access, error code otherwise | |
2629 | */ | |
2630 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2631 | { | |
e114e473 CS |
2632 | int may; |
2633 | ||
2634 | switch (cmd) { | |
2635 | case IPC_STAT: | |
2636 | case SHM_STAT: | |
2637 | may = MAY_READ; | |
2638 | break; | |
2639 | case IPC_SET: | |
2640 | case SHM_LOCK: | |
2641 | case SHM_UNLOCK: | |
2642 | case IPC_RMID: | |
2643 | may = MAY_READWRITE; | |
2644 | break; | |
2645 | case IPC_INFO: | |
2646 | case SHM_INFO: | |
2647 | /* | |
2648 | * System level information. | |
2649 | */ | |
2650 | return 0; | |
2651 | default: | |
2652 | return -EINVAL; | |
2653 | } | |
ecfcc53f | 2654 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2655 | } |
2656 | ||
2657 | /** | |
2658 | * smack_shm_shmat - Smack access for shmat | |
2659 | * @shp: the object | |
2660 | * @shmaddr: unused | |
2661 | * @shmflg: access requested | |
2662 | * | |
2663 | * Returns 0 if current has the requested access, error code otherwise | |
2664 | */ | |
2665 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2666 | int shmflg) | |
2667 | { | |
e114e473 CS |
2668 | int may; |
2669 | ||
2670 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2671 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2672 | } |
2673 | ||
2674 | /** | |
2675 | * smack_of_sem - the smack pointer for the sem | |
2676 | * @sma: the object | |
2677 | * | |
2678 | * Returns a pointer to the smack value | |
2679 | */ | |
2680 | static char *smack_of_sem(struct sem_array *sma) | |
2681 | { | |
2682 | return (char *)sma->sem_perm.security; | |
2683 | } | |
2684 | ||
2685 | /** | |
2686 | * smack_sem_alloc_security - Set the security blob for sem | |
2687 | * @sma: the object | |
2688 | * | |
2689 | * Returns 0 | |
2690 | */ | |
2691 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2692 | { | |
2693 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2694 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2695 | |
2f823ff8 | 2696 | isp->security = skp->smk_known; |
e114e473 CS |
2697 | return 0; |
2698 | } | |
2699 | ||
2700 | /** | |
2701 | * smack_sem_free_security - Clear the security blob for sem | |
2702 | * @sma: the object | |
2703 | * | |
2704 | * Clears the blob pointer | |
2705 | */ | |
2706 | static void smack_sem_free_security(struct sem_array *sma) | |
2707 | { | |
2708 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2709 | ||
2710 | isp->security = NULL; | |
2711 | } | |
2712 | ||
ecfcc53f EB |
2713 | /** |
2714 | * smk_curacc_sem : check if current has access on sem | |
2715 | * @sma : the object | |
2716 | * @access : access requested | |
2717 | * | |
2718 | * Returns 0 if current has the requested access, error code otherwise | |
2719 | */ | |
2720 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2721 | { | |
2722 | char *ssp = smack_of_sem(sma); | |
2723 | struct smk_audit_info ad; | |
d166c802 | 2724 | int rc; |
ecfcc53f EB |
2725 | |
2726 | #ifdef CONFIG_AUDIT | |
2727 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2728 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2729 | #endif | |
d166c802 CS |
2730 | rc = smk_curacc(ssp, access, &ad); |
2731 | rc = smk_bu_current("sem", ssp, access, rc); | |
2732 | return rc; | |
ecfcc53f EB |
2733 | } |
2734 | ||
e114e473 CS |
2735 | /** |
2736 | * smack_sem_associate - Smack access check for sem | |
2737 | * @sma: the object | |
2738 | * @semflg: access requested | |
2739 | * | |
2740 | * Returns 0 if current has the requested access, error code otherwise | |
2741 | */ | |
2742 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2743 | { | |
e114e473 CS |
2744 | int may; |
2745 | ||
2746 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2747 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2748 | } |
2749 | ||
2750 | /** | |
2751 | * smack_sem_shmctl - Smack access check for sem | |
2752 | * @sma: the object | |
2753 | * @cmd: what it wants to do | |
2754 | * | |
2755 | * Returns 0 if current has the requested access, error code otherwise | |
2756 | */ | |
2757 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2758 | { | |
e114e473 CS |
2759 | int may; |
2760 | ||
2761 | switch (cmd) { | |
2762 | case GETPID: | |
2763 | case GETNCNT: | |
2764 | case GETZCNT: | |
2765 | case GETVAL: | |
2766 | case GETALL: | |
2767 | case IPC_STAT: | |
2768 | case SEM_STAT: | |
2769 | may = MAY_READ; | |
2770 | break; | |
2771 | case SETVAL: | |
2772 | case SETALL: | |
2773 | case IPC_RMID: | |
2774 | case IPC_SET: | |
2775 | may = MAY_READWRITE; | |
2776 | break; | |
2777 | case IPC_INFO: | |
2778 | case SEM_INFO: | |
2779 | /* | |
2780 | * System level information | |
2781 | */ | |
2782 | return 0; | |
2783 | default: | |
2784 | return -EINVAL; | |
2785 | } | |
2786 | ||
ecfcc53f | 2787 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2788 | } |
2789 | ||
2790 | /** | |
2791 | * smack_sem_semop - Smack checks of semaphore operations | |
2792 | * @sma: the object | |
2793 | * @sops: unused | |
2794 | * @nsops: unused | |
2795 | * @alter: unused | |
2796 | * | |
2797 | * Treated as read and write in all cases. | |
2798 | * | |
2799 | * Returns 0 if access is allowed, error code otherwise | |
2800 | */ | |
2801 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2802 | unsigned nsops, int alter) | |
2803 | { | |
ecfcc53f | 2804 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2805 | } |
2806 | ||
2807 | /** | |
2808 | * smack_msg_alloc_security - Set the security blob for msg | |
2809 | * @msq: the object | |
2810 | * | |
2811 | * Returns 0 | |
2812 | */ | |
2813 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2814 | { | |
2815 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2816 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2817 | |
2f823ff8 | 2818 | kisp->security = skp->smk_known; |
e114e473 CS |
2819 | return 0; |
2820 | } | |
2821 | ||
2822 | /** | |
2823 | * smack_msg_free_security - Clear the security blob for msg | |
2824 | * @msq: the object | |
2825 | * | |
2826 | * Clears the blob pointer | |
2827 | */ | |
2828 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2829 | { | |
2830 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2831 | ||
2832 | kisp->security = NULL; | |
2833 | } | |
2834 | ||
2835 | /** | |
2836 | * smack_of_msq - the smack pointer for the msq | |
2837 | * @msq: the object | |
2838 | * | |
2839 | * Returns a pointer to the smack value | |
2840 | */ | |
2841 | static char *smack_of_msq(struct msg_queue *msq) | |
2842 | { | |
2843 | return (char *)msq->q_perm.security; | |
2844 | } | |
2845 | ||
ecfcc53f EB |
2846 | /** |
2847 | * smk_curacc_msq : helper to check if current has access on msq | |
2848 | * @msq : the msq | |
2849 | * @access : access requested | |
2850 | * | |
2851 | * return 0 if current has access, error otherwise | |
2852 | */ | |
2853 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2854 | { | |
2855 | char *msp = smack_of_msq(msq); | |
2856 | struct smk_audit_info ad; | |
d166c802 | 2857 | int rc; |
ecfcc53f EB |
2858 | |
2859 | #ifdef CONFIG_AUDIT | |
2860 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2861 | ad.a.u.ipc_id = msq->q_perm.id; | |
2862 | #endif | |
d166c802 CS |
2863 | rc = smk_curacc(msp, access, &ad); |
2864 | rc = smk_bu_current("msq", msp, access, rc); | |
2865 | return rc; | |
ecfcc53f EB |
2866 | } |
2867 | ||
e114e473 CS |
2868 | /** |
2869 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2870 | * @msq: the object | |
2871 | * @msqflg: access requested | |
2872 | * | |
2873 | * Returns 0 if current has the requested access, error code otherwise | |
2874 | */ | |
2875 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2876 | { | |
e114e473 CS |
2877 | int may; |
2878 | ||
2879 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2880 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2881 | } |
2882 | ||
2883 | /** | |
2884 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2885 | * @msq: the object | |
2886 | * @cmd: what it wants to do | |
2887 | * | |
2888 | * Returns 0 if current has the requested access, error code otherwise | |
2889 | */ | |
2890 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2891 | { | |
e114e473 CS |
2892 | int may; |
2893 | ||
2894 | switch (cmd) { | |
2895 | case IPC_STAT: | |
2896 | case MSG_STAT: | |
2897 | may = MAY_READ; | |
2898 | break; | |
2899 | case IPC_SET: | |
2900 | case IPC_RMID: | |
2901 | may = MAY_READWRITE; | |
2902 | break; | |
2903 | case IPC_INFO: | |
2904 | case MSG_INFO: | |
2905 | /* | |
2906 | * System level information | |
2907 | */ | |
2908 | return 0; | |
2909 | default: | |
2910 | return -EINVAL; | |
2911 | } | |
2912 | ||
ecfcc53f | 2913 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2914 | } |
2915 | ||
2916 | /** | |
2917 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2918 | * @msq: the object | |
2919 | * @msg: unused | |
2920 | * @msqflg: access requested | |
2921 | * | |
2922 | * Returns 0 if current has the requested access, error code otherwise | |
2923 | */ | |
2924 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2925 | int msqflg) | |
2926 | { | |
ecfcc53f | 2927 | int may; |
e114e473 | 2928 | |
ecfcc53f EB |
2929 | may = smack_flags_to_may(msqflg); |
2930 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2931 | } |
2932 | ||
2933 | /** | |
2934 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2935 | * @msq: the object | |
2936 | * @msg: unused | |
2937 | * @target: unused | |
2938 | * @type: unused | |
2939 | * @mode: unused | |
2940 | * | |
2941 | * Returns 0 if current has read and write access, error code otherwise | |
2942 | */ | |
2943 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2944 | struct task_struct *target, long type, int mode) | |
2945 | { | |
ecfcc53f | 2946 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2947 | } |
2948 | ||
2949 | /** | |
2950 | * smack_ipc_permission - Smack access for ipc_permission() | |
2951 | * @ipp: the object permissions | |
2952 | * @flag: access requested | |
2953 | * | |
2954 | * Returns 0 if current has read and write access, error code otherwise | |
2955 | */ | |
2956 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2957 | { | |
2958 | char *isp = ipp->security; | |
ecfcc53f EB |
2959 | int may = smack_flags_to_may(flag); |
2960 | struct smk_audit_info ad; | |
d166c802 | 2961 | int rc; |
e114e473 | 2962 | |
ecfcc53f EB |
2963 | #ifdef CONFIG_AUDIT |
2964 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2965 | ad.a.u.ipc_id = ipp->id; | |
2966 | #endif | |
d166c802 CS |
2967 | rc = smk_curacc(isp, may, &ad); |
2968 | rc = smk_bu_current("svipc", isp, may, rc); | |
2969 | return rc; | |
e114e473 CS |
2970 | } |
2971 | ||
d20bdda6 AD |
2972 | /** |
2973 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2974 | * @ipp: the object permissions |
d20bdda6 AD |
2975 | * @secid: where result will be saved |
2976 | */ | |
2977 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2978 | { | |
2979 | char *smack = ipp->security; | |
2980 | ||
2981 | *secid = smack_to_secid(smack); | |
2982 | } | |
2983 | ||
e114e473 CS |
2984 | /** |
2985 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2986 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2987 | * @inode: the object |
2988 | * | |
2989 | * Set the inode's security blob if it hasn't been done already. | |
2990 | */ | |
2991 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2992 | { | |
2993 | struct super_block *sbp; | |
2994 | struct superblock_smack *sbsp; | |
2995 | struct inode_smack *isp; | |
2f823ff8 CS |
2996 | struct smack_known *skp; |
2997 | struct smack_known *ckp = smk_of_current(); | |
e114e473 | 2998 | char *final; |
5c6d1125 JS |
2999 | char trattr[TRANS_TRUE_SIZE]; |
3000 | int transflag = 0; | |
2267b13a | 3001 | int rc; |
e114e473 CS |
3002 | struct dentry *dp; |
3003 | ||
3004 | if (inode == NULL) | |
3005 | return; | |
3006 | ||
3007 | isp = inode->i_security; | |
3008 | ||
3009 | mutex_lock(&isp->smk_lock); | |
3010 | /* | |
3011 | * If the inode is already instantiated | |
3012 | * take the quick way out | |
3013 | */ | |
3014 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3015 | goto unlockandout; | |
3016 | ||
3017 | sbp = inode->i_sb; | |
3018 | sbsp = sbp->s_security; | |
3019 | /* | |
3020 | * We're going to use the superblock default label | |
3021 | * if there's no label on the file. | |
3022 | */ | |
3023 | final = sbsp->smk_default; | |
3024 | ||
e97dcb0e CS |
3025 | /* |
3026 | * If this is the root inode the superblock | |
3027 | * may be in the process of initialization. | |
3028 | * If that is the case use the root value out | |
3029 | * of the superblock. | |
3030 | */ | |
3031 | if (opt_dentry->d_parent == opt_dentry) { | |
36ea735b CS |
3032 | if (sbp->s_magic == CGROUP_SUPER_MAGIC) { |
3033 | /* | |
3034 | * The cgroup filesystem is never mounted, | |
3035 | * so there's no opportunity to set the mount | |
3036 | * options. | |
3037 | */ | |
3038 | sbsp->smk_root = smack_known_star.smk_known; | |
3039 | sbsp->smk_default = smack_known_star.smk_known; | |
3040 | } | |
e97dcb0e CS |
3041 | isp->smk_inode = sbsp->smk_root; |
3042 | isp->smk_flags |= SMK_INODE_INSTANT; | |
3043 | goto unlockandout; | |
3044 | } | |
3045 | ||
e114e473 CS |
3046 | /* |
3047 | * This is pretty hackish. | |
3048 | * Casey says that we shouldn't have to do | |
3049 | * file system specific code, but it does help | |
3050 | * with keeping it simple. | |
3051 | */ | |
3052 | switch (sbp->s_magic) { | |
3053 | case SMACK_MAGIC: | |
36ea735b CS |
3054 | case PIPEFS_MAGIC: |
3055 | case SOCKFS_MAGIC: | |
3056 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 3057 | /* |
25985edc | 3058 | * Casey says that it's a little embarrassing |
e114e473 CS |
3059 | * that the smack file system doesn't do |
3060 | * extended attributes. | |
36ea735b | 3061 | * |
e114e473 | 3062 | * Casey says pipes are easy (?) |
36ea735b CS |
3063 | * |
3064 | * Socket access is controlled by the socket | |
3065 | * structures associated with the task involved. | |
3066 | * | |
3067 | * Cgroupfs is special | |
e114e473 CS |
3068 | */ |
3069 | final = smack_known_star.smk_known; | |
3070 | break; | |
3071 | case DEVPTS_SUPER_MAGIC: | |
3072 | /* | |
3073 | * devpts seems content with the label of the task. | |
3074 | * Programs that change smack have to treat the | |
3075 | * pty with respect. | |
3076 | */ | |
2f823ff8 | 3077 | final = ckp->smk_known; |
e114e473 | 3078 | break; |
e114e473 CS |
3079 | case PROC_SUPER_MAGIC: |
3080 | /* | |
3081 | * Casey says procfs appears not to care. | |
3082 | * The superblock default suffices. | |
3083 | */ | |
3084 | break; | |
3085 | case TMPFS_MAGIC: | |
3086 | /* | |
3087 | * Device labels should come from the filesystem, | |
3088 | * but watch out, because they're volitile, | |
3089 | * getting recreated on every reboot. | |
3090 | */ | |
3091 | final = smack_known_star.smk_known; | |
3092 | /* | |
3093 | * No break. | |
3094 | * | |
3095 | * If a smack value has been set we want to use it, | |
3096 | * but since tmpfs isn't giving us the opportunity | |
3097 | * to set mount options simulate setting the | |
3098 | * superblock default. | |
3099 | */ | |
3100 | default: | |
3101 | /* | |
3102 | * This isn't an understood special case. | |
3103 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3104 | */ |
3105 | ||
3106 | /* | |
3107 | * UNIX domain sockets use lower level socket data. | |
3108 | */ | |
3109 | if (S_ISSOCK(inode->i_mode)) { | |
3110 | final = smack_known_star.smk_known; | |
3111 | break; | |
3112 | } | |
3113 | /* | |
e114e473 CS |
3114 | * No xattr support means, alas, no SMACK label. |
3115 | * Use the aforeapplied default. | |
3116 | * It would be curious if the label of the task | |
3117 | * does not match that assigned. | |
3118 | */ | |
3119 | if (inode->i_op->getxattr == NULL) | |
3120 | break; | |
3121 | /* | |
3122 | * Get the dentry for xattr. | |
3123 | */ | |
3e62cbb8 | 3124 | dp = dget(opt_dentry); |
2f823ff8 CS |
3125 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
3126 | if (skp != NULL) | |
3127 | final = skp->smk_known; | |
2267b13a CS |
3128 | |
3129 | /* | |
3130 | * Transmuting directory | |
3131 | */ | |
3132 | if (S_ISDIR(inode->i_mode)) { | |
3133 | /* | |
3134 | * If this is a new directory and the label was | |
3135 | * transmuted when the inode was initialized | |
3136 | * set the transmute attribute on the directory | |
3137 | * and mark the inode. | |
3138 | * | |
3139 | * If there is a transmute attribute on the | |
3140 | * directory mark the inode. | |
3141 | */ | |
3142 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3143 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
3144 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 3145 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3146 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3147 | 0); | |
3148 | } else { | |
3149 | rc = inode->i_op->getxattr(dp, | |
3150 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3151 | TRANS_TRUE_SIZE); | |
3152 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3153 | TRANS_TRUE_SIZE) != 0) | |
3154 | rc = -EINVAL; | |
5c6d1125 | 3155 | } |
2267b13a CS |
3156 | if (rc >= 0) |
3157 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3158 | } |
19760ad0 CS |
3159 | /* |
3160 | * Don't let the exec or mmap label be "*" or "@". | |
3161 | */ | |
3162 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3163 | if (skp == &smack_known_star || skp == &smack_known_web) | |
3164 | skp = NULL; | |
3165 | isp->smk_task = skp; | |
3166 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); | |
3167 | if (skp == &smack_known_star || skp == &smack_known_web) | |
3168 | skp = NULL; | |
3169 | isp->smk_mmap = skp; | |
676dac4b | 3170 | |
e114e473 CS |
3171 | dput(dp); |
3172 | break; | |
3173 | } | |
3174 | ||
3175 | if (final == NULL) | |
2f823ff8 | 3176 | isp->smk_inode = ckp->smk_known; |
e114e473 CS |
3177 | else |
3178 | isp->smk_inode = final; | |
3179 | ||
5c6d1125 | 3180 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3181 | |
3182 | unlockandout: | |
3183 | mutex_unlock(&isp->smk_lock); | |
3184 | return; | |
3185 | } | |
3186 | ||
3187 | /** | |
3188 | * smack_getprocattr - Smack process attribute access | |
3189 | * @p: the object task | |
3190 | * @name: the name of the attribute in /proc/.../attr | |
3191 | * @value: where to put the result | |
3192 | * | |
3193 | * Places a copy of the task Smack into value | |
3194 | * | |
3195 | * Returns the length of the smack label or an error code | |
3196 | */ | |
3197 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3198 | { | |
2f823ff8 | 3199 | struct smack_known *skp = smk_of_task(task_security(p)); |
e114e473 CS |
3200 | char *cp; |
3201 | int slen; | |
3202 | ||
3203 | if (strcmp(name, "current") != 0) | |
3204 | return -EINVAL; | |
3205 | ||
2f823ff8 | 3206 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3207 | if (cp == NULL) |
3208 | return -ENOMEM; | |
3209 | ||
3210 | slen = strlen(cp); | |
3211 | *value = cp; | |
3212 | return slen; | |
3213 | } | |
3214 | ||
3215 | /** | |
3216 | * smack_setprocattr - Smack process attribute setting | |
3217 | * @p: the object task | |
3218 | * @name: the name of the attribute in /proc/.../attr | |
3219 | * @value: the value to set | |
3220 | * @size: the size of the value | |
3221 | * | |
3222 | * Sets the Smack value of the task. Only setting self | |
3223 | * is permitted and only with privilege | |
3224 | * | |
3225 | * Returns the length of the smack label or an error code | |
3226 | */ | |
3227 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3228 | void *value, size_t size) | |
3229 | { | |
676dac4b | 3230 | struct task_smack *tsp; |
d84f4f99 | 3231 | struct cred *new; |
2f823ff8 | 3232 | struct smack_known *skp; |
e114e473 | 3233 | |
e114e473 CS |
3234 | /* |
3235 | * Changing another process' Smack value is too dangerous | |
3236 | * and supports no sane use case. | |
3237 | */ | |
3238 | if (p != current) | |
3239 | return -EPERM; | |
3240 | ||
1880eff7 | 3241 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3242 | return -EPERM; |
3243 | ||
f7112e6c | 3244 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3245 | return -EINVAL; |
3246 | ||
3247 | if (strcmp(name, "current") != 0) | |
3248 | return -EINVAL; | |
3249 | ||
2f823ff8 CS |
3250 | skp = smk_import_entry(value, size); |
3251 | if (skp == NULL) | |
e114e473 CS |
3252 | return -EINVAL; |
3253 | ||
6d3dc07c CS |
3254 | /* |
3255 | * No process is ever allowed the web ("@") label. | |
3256 | */ | |
2f823ff8 | 3257 | if (skp == &smack_known_web) |
6d3dc07c CS |
3258 | return -EPERM; |
3259 | ||
d84f4f99 | 3260 | new = prepare_creds(); |
6d3dc07c | 3261 | if (new == NULL) |
d84f4f99 | 3262 | return -ENOMEM; |
7898e1f8 | 3263 | |
46a2f3b9 | 3264 | tsp = new->security; |
2f823ff8 | 3265 | tsp->smk_task = skp; |
7898e1f8 | 3266 | |
d84f4f99 | 3267 | commit_creds(new); |
e114e473 CS |
3268 | return size; |
3269 | } | |
3270 | ||
3271 | /** | |
3272 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3273 | * @sock: one sock |
3274 | * @other: the other sock | |
e114e473 CS |
3275 | * @newsk: unused |
3276 | * | |
3277 | * Return 0 if a subject with the smack of sock could access | |
3278 | * an object with the smack of other, otherwise an error code | |
3279 | */ | |
3610cda5 DM |
3280 | static int smack_unix_stream_connect(struct sock *sock, |
3281 | struct sock *other, struct sock *newsk) | |
e114e473 | 3282 | { |
2f823ff8 | 3283 | struct smack_known *skp; |
54e70ec5 | 3284 | struct smack_known *okp; |
d2e7ad19 JM |
3285 | struct socket_smack *ssp = sock->sk_security; |
3286 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3287 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3288 | struct smk_audit_info ad; |
b4e0d5f0 | 3289 | int rc = 0; |
923e9a13 KC |
3290 | #ifdef CONFIG_AUDIT |
3291 | struct lsm_network_audit net; | |
923e9a13 | 3292 | #endif |
b4e0d5f0 | 3293 | |
2f823ff8 CS |
3294 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3295 | skp = ssp->smk_out; | |
54e70ec5 CS |
3296 | okp = osp->smk_out; |
3297 | #ifdef CONFIG_AUDIT | |
3298 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3299 | smk_ad_setfield_u_net_sk(&ad, other); | |
3300 | #endif | |
3301 | rc = smk_access(skp, okp->smk_known, MAY_WRITE, &ad); | |
d166c802 CS |
3302 | rc = smk_bu_note("UDS connect", skp, okp->smk_known, |
3303 | MAY_WRITE, rc); | |
3304 | if (rc == 0) { | |
d0175790 LP |
3305 | rc = smk_access(okp, skp->smk_known, MAY_WRITE, NULL); |
3306 | rc = smk_bu_note("UDS connect", okp, skp->smk_known, | |
d166c802 CS |
3307 | MAY_WRITE, rc); |
3308 | } | |
2f823ff8 | 3309 | } |
b4e0d5f0 | 3310 | |
975d5e55 CS |
3311 | /* |
3312 | * Cross reference the peer labels for SO_PEERSEC. | |
3313 | */ | |
3314 | if (rc == 0) { | |
54e70ec5 CS |
3315 | nsp->smk_packet = ssp->smk_out; |
3316 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3317 | } |
3318 | ||
b4e0d5f0 | 3319 | return rc; |
e114e473 CS |
3320 | } |
3321 | ||
3322 | /** | |
3323 | * smack_unix_may_send - Smack access on UDS | |
3324 | * @sock: one socket | |
3325 | * @other: the other socket | |
3326 | * | |
3327 | * Return 0 if a subject with the smack of sock could access | |
3328 | * an object with the smack of other, otherwise an error code | |
3329 | */ | |
3330 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3331 | { | |
b4e0d5f0 CS |
3332 | struct socket_smack *ssp = sock->sk->sk_security; |
3333 | struct socket_smack *osp = other->sk->sk_security; | |
2f823ff8 | 3334 | struct smack_known *skp; |
ecfcc53f | 3335 | struct smk_audit_info ad; |
d166c802 | 3336 | int rc; |
e114e473 | 3337 | |
923e9a13 KC |
3338 | #ifdef CONFIG_AUDIT |
3339 | struct lsm_network_audit net; | |
3340 | ||
48c62af6 | 3341 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3342 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3343 | #endif |
b4e0d5f0 | 3344 | |
2f823ff8 CS |
3345 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3346 | return 0; | |
b4e0d5f0 | 3347 | |
2f823ff8 | 3348 | skp = ssp->smk_out; |
d166c802 CS |
3349 | rc = smk_access(skp, osp->smk_in->smk_known, MAY_WRITE, &ad); |
3350 | rc = smk_bu_note("UDS send", skp, osp->smk_in->smk_known, | |
3351 | MAY_WRITE, rc); | |
3352 | return rc; | |
e114e473 CS |
3353 | } |
3354 | ||
6d3dc07c CS |
3355 | /** |
3356 | * smack_socket_sendmsg - Smack check based on destination host | |
3357 | * @sock: the socket | |
251a2a95 | 3358 | * @msg: the message |
6d3dc07c CS |
3359 | * @size: the size of the message |
3360 | * | |
c6739443 CS |
3361 | * Return 0 if the current subject can write to the destination host. |
3362 | * For IPv4 this is only a question if the destination is a single label host. | |
3363 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3364 | */ |
3365 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3366 | int size) | |
3367 | { | |
3368 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6ea06247 | 3369 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
c6739443 | 3370 | int rc = 0; |
6d3dc07c CS |
3371 | |
3372 | /* | |
3373 | * Perfectly reasonable for this to be NULL | |
3374 | */ | |
c6739443 | 3375 | if (sip == NULL) |
6d3dc07c CS |
3376 | return 0; |
3377 | ||
c6739443 CS |
3378 | switch (sip->sin_family) { |
3379 | case AF_INET: | |
3380 | rc = smack_netlabel_send(sock->sk, sip); | |
3381 | break; | |
3382 | case AF_INET6: | |
3383 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); | |
3384 | break; | |
3385 | } | |
3386 | return rc; | |
6d3dc07c CS |
3387 | } |
3388 | ||
e114e473 | 3389 | /** |
251a2a95 | 3390 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3391 | * @sap: netlabel secattr |
272cd7a8 | 3392 | * @ssp: socket security information |
e114e473 | 3393 | * |
2f823ff8 | 3394 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3395 | */ |
2f823ff8 CS |
3396 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3397 | struct socket_smack *ssp) | |
e114e473 | 3398 | { |
2f823ff8 | 3399 | struct smack_known *skp; |
f7112e6c | 3400 | int found = 0; |
677264e8 CS |
3401 | int acat; |
3402 | int kcat; | |
e114e473 | 3403 | |
6d3dc07c | 3404 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3405 | /* |
6d3dc07c | 3406 | * Looks like a CIPSO packet. |
e114e473 CS |
3407 | * If there are flags but no level netlabel isn't |
3408 | * behaving the way we expect it to. | |
3409 | * | |
f7112e6c | 3410 | * Look it up in the label table |
e114e473 CS |
3411 | * Without guidance regarding the smack value |
3412 | * for the packet fall back on the network | |
3413 | * ambient value. | |
3414 | */ | |
f7112e6c | 3415 | rcu_read_lock(); |
2f823ff8 CS |
3416 | list_for_each_entry(skp, &smack_known_list, list) { |
3417 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3418 | continue; |
677264e8 CS |
3419 | /* |
3420 | * Compare the catsets. Use the netlbl APIs. | |
3421 | */ | |
3422 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3423 | if ((skp->smk_netlabel.flags & | |
3424 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3425 | found = 1; | |
3426 | break; | |
3427 | } | |
3428 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3429 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3430 | acat + 1); | |
3431 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3432 | skp->smk_netlabel.attr.mls.cat, |
3433 | kcat + 1); | |
3434 | if (acat < 0 || kcat < 0) | |
3435 | break; | |
3436 | } | |
3437 | if (acat == kcat) { | |
3438 | found = 1; | |
3439 | break; | |
3440 | } | |
6d3dc07c | 3441 | } |
f7112e6c CS |
3442 | rcu_read_unlock(); |
3443 | ||
3444 | if (found) | |
2f823ff8 | 3445 | return skp; |
f7112e6c | 3446 | |
54e70ec5 | 3447 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3448 | return &smack_known_web; |
3449 | return &smack_known_star; | |
e114e473 | 3450 | } |
6d3dc07c CS |
3451 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3452 | /* | |
3453 | * Looks like a fallback, which gives us a secid. | |
3454 | */ | |
2f823ff8 | 3455 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3456 | /* |
3457 | * This has got to be a bug because it is | |
3458 | * impossible to specify a fallback without | |
3459 | * specifying the label, which will ensure | |
3460 | * it has a secid, and the only way to get a | |
3461 | * secid is from a fallback. | |
3462 | */ | |
2f823ff8 CS |
3463 | BUG_ON(skp == NULL); |
3464 | return skp; | |
e114e473 CS |
3465 | } |
3466 | /* | |
6d3dc07c CS |
3467 | * Without guidance regarding the smack value |
3468 | * for the packet fall back on the network | |
3469 | * ambient value. | |
e114e473 | 3470 | */ |
272cd7a8 | 3471 | return smack_net_ambient; |
e114e473 CS |
3472 | } |
3473 | ||
6ea06247 | 3474 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3475 | { |
c6739443 CS |
3476 | u8 nexthdr; |
3477 | int offset; | |
3478 | int proto = -EINVAL; | |
3479 | struct ipv6hdr _ipv6h; | |
3480 | struct ipv6hdr *ip6; | |
3481 | __be16 frag_off; | |
3482 | struct tcphdr _tcph, *th; | |
3483 | struct udphdr _udph, *uh; | |
3484 | struct dccp_hdr _dccph, *dh; | |
3485 | ||
3486 | sip->sin6_port = 0; | |
3487 | ||
3488 | offset = skb_network_offset(skb); | |
3489 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3490 | if (ip6 == NULL) | |
3491 | return -EINVAL; | |
3492 | sip->sin6_addr = ip6->saddr; | |
3493 | ||
3494 | nexthdr = ip6->nexthdr; | |
3495 | offset += sizeof(_ipv6h); | |
3496 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3497 | if (offset < 0) | |
3498 | return -EINVAL; | |
3499 | ||
3500 | proto = nexthdr; | |
3501 | switch (proto) { | |
3502 | case IPPROTO_TCP: | |
3503 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3504 | if (th != NULL) | |
3505 | sip->sin6_port = th->source; | |
3506 | break; | |
3507 | case IPPROTO_UDP: | |
3508 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3509 | if (uh != NULL) | |
3510 | sip->sin6_port = uh->source; | |
3511 | break; | |
3512 | case IPPROTO_DCCP: | |
3513 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3514 | if (dh != NULL) | |
3515 | sip->sin6_port = dh->dccph_sport; | |
3516 | break; | |
3517 | } | |
3518 | return proto; | |
3519 | } | |
3520 | ||
e114e473 CS |
3521 | /** |
3522 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3523 | * @sk: socket | |
3524 | * @skb: packet | |
3525 | * | |
3526 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3527 | */ | |
3528 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3529 | { | |
3530 | struct netlbl_lsm_secattr secattr; | |
3531 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3532 | struct smack_known *skp; |
6ea06247 | 3533 | struct sockaddr_in6 sadd; |
c6739443 | 3534 | int rc = 0; |
ecfcc53f | 3535 | struct smk_audit_info ad; |
923e9a13 | 3536 | #ifdef CONFIG_AUDIT |
48c62af6 | 3537 | struct lsm_network_audit net; |
923e9a13 | 3538 | #endif |
c6739443 CS |
3539 | switch (sk->sk_family) { |
3540 | case PF_INET: | |
3541 | /* | |
3542 | * Translate what netlabel gave us. | |
3543 | */ | |
3544 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3545 | |
c6739443 CS |
3546 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3547 | if (rc == 0) | |
2f823ff8 | 3548 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3549 | else |
2f823ff8 | 3550 | skp = smack_net_ambient; |
6d3dc07c | 3551 | |
c6739443 | 3552 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3553 | |
ecfcc53f | 3554 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3555 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3556 | ad.a.u.net->family = sk->sk_family; | |
3557 | ad.a.u.net->netif = skb->skb_iif; | |
3558 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3559 | #endif |
c6739443 CS |
3560 | /* |
3561 | * Receiving a packet requires that the other end | |
3562 | * be able to write here. Read access is not required. | |
3563 | * This is the simplist possible security model | |
3564 | * for networking. | |
3565 | */ | |
54e70ec5 | 3566 | rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad); |
d166c802 CS |
3567 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in->smk_known, |
3568 | MAY_WRITE, rc); | |
c6739443 CS |
3569 | if (rc != 0) |
3570 | netlbl_skbuff_err(skb, rc, 0); | |
3571 | break; | |
3572 | case PF_INET6: | |
3573 | rc = smk_skb_to_addr_ipv6(skb, &sadd); | |
3574 | if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) | |
3575 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3576 | else | |
3577 | rc = 0; | |
3578 | break; | |
3579 | } | |
a8134296 | 3580 | return rc; |
e114e473 CS |
3581 | } |
3582 | ||
3583 | /** | |
3584 | * smack_socket_getpeersec_stream - pull in packet label | |
3585 | * @sock: the socket | |
3586 | * @optval: user's destination | |
3587 | * @optlen: size thereof | |
251a2a95 | 3588 | * @len: max thereof |
e114e473 CS |
3589 | * |
3590 | * returns zero on success, an error code otherwise | |
3591 | */ | |
3592 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3593 | char __user *optval, | |
3594 | int __user *optlen, unsigned len) | |
3595 | { | |
3596 | struct socket_smack *ssp; | |
272cd7a8 CS |
3597 | char *rcp = ""; |
3598 | int slen = 1; | |
e114e473 CS |
3599 | int rc = 0; |
3600 | ||
3601 | ssp = sock->sk->sk_security; | |
272cd7a8 | 3602 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 3603 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
3604 | slen = strlen(rcp) + 1; |
3605 | } | |
e114e473 CS |
3606 | |
3607 | if (slen > len) | |
3608 | rc = -ERANGE; | |
272cd7a8 | 3609 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3610 | rc = -EFAULT; |
3611 | ||
3612 | if (put_user(slen, optlen) != 0) | |
3613 | rc = -EFAULT; | |
3614 | ||
3615 | return rc; | |
3616 | } | |
3617 | ||
3618 | ||
3619 | /** | |
3620 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3621 | * @sock: the peer socket |
e114e473 CS |
3622 | * @skb: packet data |
3623 | * @secid: pointer to where to put the secid of the packet | |
3624 | * | |
3625 | * Sets the netlabel socket state on sk from parent | |
3626 | */ | |
3627 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3628 | struct sk_buff *skb, u32 *secid) | |
3629 | ||
3630 | { | |
3631 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3632 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3633 | struct smack_known *skp; |
b4e0d5f0 CS |
3634 | int family = PF_UNSPEC; |
3635 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3636 | int rc; |
3637 | ||
b4e0d5f0 CS |
3638 | if (skb != NULL) { |
3639 | if (skb->protocol == htons(ETH_P_IP)) | |
3640 | family = PF_INET; | |
3641 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3642 | family = PF_INET6; | |
e114e473 | 3643 | } |
b4e0d5f0 CS |
3644 | if (family == PF_UNSPEC && sock != NULL) |
3645 | family = sock->sk->sk_family; | |
e114e473 | 3646 | |
b4e0d5f0 | 3647 | if (family == PF_UNIX) { |
272cd7a8 | 3648 | ssp = sock->sk->sk_security; |
2f823ff8 | 3649 | s = ssp->smk_out->smk_secid; |
b4e0d5f0 CS |
3650 | } else if (family == PF_INET || family == PF_INET6) { |
3651 | /* | |
3652 | * Translate what netlabel gave us. | |
3653 | */ | |
272cd7a8 CS |
3654 | if (sock != NULL && sock->sk != NULL) |
3655 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3656 | netlbl_secattr_init(&secattr); |
3657 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3658 | if (rc == 0) { | |
2f823ff8 CS |
3659 | skp = smack_from_secattr(&secattr, ssp); |
3660 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3661 | } |
3662 | netlbl_secattr_destroy(&secattr); | |
3663 | } | |
3664 | *secid = s; | |
e114e473 CS |
3665 | if (s == 0) |
3666 | return -EINVAL; | |
e114e473 CS |
3667 | return 0; |
3668 | } | |
3669 | ||
3670 | /** | |
07feee8f PM |
3671 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3672 | * @sk: child sock | |
3673 | * @parent: parent socket | |
e114e473 | 3674 | * |
07feee8f PM |
3675 | * Set the smk_{in,out} state of an existing sock based on the process that |
3676 | * is creating the new socket. | |
e114e473 CS |
3677 | */ |
3678 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3679 | { | |
3680 | struct socket_smack *ssp; | |
2f823ff8 | 3681 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3682 | |
07feee8f PM |
3683 | if (sk == NULL || |
3684 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3685 | return; |
3686 | ||
3687 | ssp = sk->sk_security; | |
54e70ec5 | 3688 | ssp->smk_in = skp; |
2f823ff8 | 3689 | ssp->smk_out = skp; |
07feee8f | 3690 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3691 | } |
3692 | ||
3693 | /** | |
3694 | * smack_inet_conn_request - Smack access check on connect | |
3695 | * @sk: socket involved | |
3696 | * @skb: packet | |
3697 | * @req: unused | |
3698 | * | |
3699 | * Returns 0 if a task with the packet label could write to | |
3700 | * the socket, otherwise an error code | |
3701 | */ | |
3702 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3703 | struct request_sock *req) | |
3704 | { | |
07feee8f | 3705 | u16 family = sk->sk_family; |
f7112e6c | 3706 | struct smack_known *skp; |
e114e473 | 3707 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3708 | struct netlbl_lsm_secattr secattr; |
3709 | struct sockaddr_in addr; | |
3710 | struct iphdr *hdr; | |
f7112e6c | 3711 | char *hsp; |
e114e473 | 3712 | int rc; |
ecfcc53f | 3713 | struct smk_audit_info ad; |
923e9a13 | 3714 | #ifdef CONFIG_AUDIT |
48c62af6 | 3715 | struct lsm_network_audit net; |
923e9a13 | 3716 | #endif |
e114e473 | 3717 | |
c6739443 CS |
3718 | if (family == PF_INET6) { |
3719 | /* | |
3720 | * Handle mapped IPv4 packets arriving | |
3721 | * via IPv6 sockets. Don't set up netlabel | |
3722 | * processing on IPv6. | |
3723 | */ | |
3724 | if (skb->protocol == htons(ETH_P_IP)) | |
3725 | family = PF_INET; | |
3726 | else | |
3727 | return 0; | |
3728 | } | |
e114e473 | 3729 | |
07feee8f PM |
3730 | netlbl_secattr_init(&secattr); |
3731 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3732 | if (rc == 0) |
2f823ff8 | 3733 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3734 | else |
2f823ff8 | 3735 | skp = &smack_known_huh; |
07feee8f PM |
3736 | netlbl_secattr_destroy(&secattr); |
3737 | ||
ecfcc53f | 3738 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3739 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3740 | ad.a.u.net->family = family; | |
3741 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3742 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3743 | #endif | |
e114e473 | 3744 | /* |
07feee8f PM |
3745 | * Receiving a packet requires that the other end be able to write |
3746 | * here. Read access is not required. | |
e114e473 | 3747 | */ |
54e70ec5 | 3748 | rc = smk_access(skp, ssp->smk_in->smk_known, MAY_WRITE, &ad); |
d166c802 CS |
3749 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in->smk_known, |
3750 | MAY_WRITE, rc); | |
07feee8f PM |
3751 | if (rc != 0) |
3752 | return rc; | |
3753 | ||
3754 | /* | |
3755 | * Save the peer's label in the request_sock so we can later setup | |
3756 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3757 | */ | |
2f823ff8 | 3758 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3759 | |
3760 | /* | |
3761 | * We need to decide if we want to label the incoming connection here | |
3762 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3763 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3764 | */ |
3765 | hdr = ip_hdr(skb); | |
3766 | addr.sin_addr.s_addr = hdr->saddr; | |
3767 | rcu_read_lock(); | |
f7112e6c CS |
3768 | hsp = smack_host_label(&addr); |
3769 | rcu_read_unlock(); | |
3770 | ||
2f823ff8 | 3771 | if (hsp == NULL) |
f7112e6c | 3772 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3773 | else |
07feee8f | 3774 | netlbl_req_delattr(req); |
e114e473 CS |
3775 | |
3776 | return rc; | |
3777 | } | |
3778 | ||
07feee8f PM |
3779 | /** |
3780 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3781 | * @sk: the new socket | |
3782 | * @req: the connection's request_sock | |
3783 | * | |
3784 | * Transfer the connection's peer label to the newly created socket. | |
3785 | */ | |
3786 | static void smack_inet_csk_clone(struct sock *sk, | |
3787 | const struct request_sock *req) | |
3788 | { | |
3789 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3790 | struct smack_known *skp; |
07feee8f | 3791 | |
2f823ff8 CS |
3792 | if (req->peer_secid != 0) { |
3793 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 3794 | ssp->smk_packet = skp; |
2f823ff8 | 3795 | } else |
272cd7a8 | 3796 | ssp->smk_packet = NULL; |
07feee8f PM |
3797 | } |
3798 | ||
e114e473 CS |
3799 | /* |
3800 | * Key management security hooks | |
3801 | * | |
3802 | * Casey has not tested key support very heavily. | |
3803 | * The permission check is most likely too restrictive. | |
3804 | * If you care about keys please have a look. | |
3805 | */ | |
3806 | #ifdef CONFIG_KEYS | |
3807 | ||
3808 | /** | |
3809 | * smack_key_alloc - Set the key security blob | |
3810 | * @key: object | |
d84f4f99 | 3811 | * @cred: the credentials to use |
e114e473 CS |
3812 | * @flags: unused |
3813 | * | |
3814 | * No allocation required | |
3815 | * | |
3816 | * Returns 0 | |
3817 | */ | |
d84f4f99 | 3818 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3819 | unsigned long flags) |
3820 | { | |
2f823ff8 CS |
3821 | struct smack_known *skp = smk_of_task(cred->security); |
3822 | ||
3823 | key->security = skp->smk_known; | |
e114e473 CS |
3824 | return 0; |
3825 | } | |
3826 | ||
3827 | /** | |
3828 | * smack_key_free - Clear the key security blob | |
3829 | * @key: the object | |
3830 | * | |
3831 | * Clear the blob pointer | |
3832 | */ | |
3833 | static void smack_key_free(struct key *key) | |
3834 | { | |
3835 | key->security = NULL; | |
3836 | } | |
3837 | ||
3838 | /* | |
3839 | * smack_key_permission - Smack access on a key | |
3840 | * @key_ref: gets to the object | |
d84f4f99 | 3841 | * @cred: the credentials to use |
e114e473 CS |
3842 | * @perm: unused |
3843 | * | |
3844 | * Return 0 if the task has read and write to the object, | |
3845 | * an error code otherwise | |
3846 | */ | |
3847 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 3848 | const struct cred *cred, unsigned perm) |
e114e473 CS |
3849 | { |
3850 | struct key *keyp; | |
ecfcc53f | 3851 | struct smk_audit_info ad; |
2f823ff8 | 3852 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 3853 | int request = 0; |
d166c802 | 3854 | int rc; |
e114e473 CS |
3855 | |
3856 | keyp = key_ref_to_ptr(key_ref); | |
3857 | if (keyp == NULL) | |
3858 | return -EINVAL; | |
3859 | /* | |
3860 | * If the key hasn't been initialized give it access so that | |
3861 | * it may do so. | |
3862 | */ | |
3863 | if (keyp->security == NULL) | |
3864 | return 0; | |
3865 | /* | |
3866 | * This should not occur | |
3867 | */ | |
2f823ff8 | 3868 | if (tkp == NULL) |
e114e473 | 3869 | return -EACCES; |
ecfcc53f EB |
3870 | #ifdef CONFIG_AUDIT |
3871 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3872 | ad.a.u.key_struct.key = keyp->serial; | |
3873 | ad.a.u.key_struct.key_desc = keyp->description; | |
3874 | #endif | |
fffea214 DK |
3875 | if (perm & KEY_NEED_READ) |
3876 | request = MAY_READ; | |
3877 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
3878 | request = MAY_WRITE; | |
d166c802 CS |
3879 | rc = smk_access(tkp, keyp->security, request, &ad); |
3880 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
3881 | return rc; | |
e114e473 CS |
3882 | } |
3883 | #endif /* CONFIG_KEYS */ | |
3884 | ||
d20bdda6 AD |
3885 | /* |
3886 | * Smack Audit hooks | |
3887 | * | |
3888 | * Audit requires a unique representation of each Smack specific | |
3889 | * rule. This unique representation is used to distinguish the | |
3890 | * object to be audited from remaining kernel objects and also | |
3891 | * works as a glue between the audit hooks. | |
3892 | * | |
3893 | * Since repository entries are added but never deleted, we'll use | |
3894 | * the smack_known label address related to the given audit rule as | |
3895 | * the needed unique representation. This also better fits the smack | |
3896 | * model where nearly everything is a label. | |
3897 | */ | |
3898 | #ifdef CONFIG_AUDIT | |
3899 | ||
3900 | /** | |
3901 | * smack_audit_rule_init - Initialize a smack audit rule | |
3902 | * @field: audit rule fields given from user-space (audit.h) | |
3903 | * @op: required testing operator (=, !=, >, <, ...) | |
3904 | * @rulestr: smack label to be audited | |
3905 | * @vrule: pointer to save our own audit rule representation | |
3906 | * | |
3907 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3908 | * The label to be audited is created if necessay. | |
3909 | */ | |
3910 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3911 | { | |
3912 | char **rule = (char **)vrule; | |
3913 | *rule = NULL; | |
3914 | ||
3915 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3916 | return -EINVAL; | |
3917 | ||
5af75d8d | 3918 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3919 | return -EINVAL; |
3920 | ||
3921 | *rule = smk_import(rulestr, 0); | |
3922 | ||
3923 | return 0; | |
3924 | } | |
3925 | ||
3926 | /** | |
3927 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3928 | * @krule: rule of interest, in Audit kernel representation format | |
3929 | * | |
3930 | * This is used to filter Smack rules from remaining Audit ones. | |
3931 | * If it's proved that this rule belongs to us, the | |
3932 | * audit_rule_match hook will be called to do the final judgement. | |
3933 | */ | |
3934 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3935 | { | |
3936 | struct audit_field *f; | |
3937 | int i; | |
3938 | ||
3939 | for (i = 0; i < krule->field_count; i++) { | |
3940 | f = &krule->fields[i]; | |
3941 | ||
3942 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3943 | return 1; | |
3944 | } | |
3945 | ||
3946 | return 0; | |
3947 | } | |
3948 | ||
3949 | /** | |
3950 | * smack_audit_rule_match - Audit given object ? | |
3951 | * @secid: security id for identifying the object to test | |
3952 | * @field: audit rule flags given from user-space | |
3953 | * @op: required testing operator | |
3954 | * @vrule: smack internal rule presentation | |
3955 | * @actx: audit context associated with the check | |
3956 | * | |
3957 | * The core Audit hook. It's used to take the decision of | |
3958 | * whether to audit or not to audit a given object. | |
3959 | */ | |
3960 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3961 | struct audit_context *actx) | |
3962 | { | |
2f823ff8 | 3963 | struct smack_known *skp; |
d20bdda6 AD |
3964 | char *rule = vrule; |
3965 | ||
4eb0f4ab RGB |
3966 | if (unlikely(!rule)) { |
3967 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
3968 | return -ENOENT; |
3969 | } | |
3970 | ||
3971 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3972 | return 0; | |
3973 | ||
2f823ff8 | 3974 | skp = smack_from_secid(secid); |
d20bdda6 AD |
3975 | |
3976 | /* | |
3977 | * No need to do string comparisons. If a match occurs, | |
3978 | * both pointers will point to the same smack_known | |
3979 | * label. | |
3980 | */ | |
5af75d8d | 3981 | if (op == Audit_equal) |
2f823ff8 | 3982 | return (rule == skp->smk_known); |
5af75d8d | 3983 | if (op == Audit_not_equal) |
2f823ff8 | 3984 | return (rule != skp->smk_known); |
d20bdda6 AD |
3985 | |
3986 | return 0; | |
3987 | } | |
3988 | ||
3989 | /** | |
3990 | * smack_audit_rule_free - free smack rule representation | |
3991 | * @vrule: rule to be freed. | |
3992 | * | |
3993 | * No memory was allocated. | |
3994 | */ | |
3995 | static void smack_audit_rule_free(void *vrule) | |
3996 | { | |
3997 | /* No-op */ | |
3998 | } | |
3999 | ||
4000 | #endif /* CONFIG_AUDIT */ | |
4001 | ||
746df9b5 DQ |
4002 | /** |
4003 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4004 | * @name: Full xattr name to check. | |
4005 | */ | |
4006 | static int smack_ismaclabel(const char *name) | |
4007 | { | |
4008 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4009 | } | |
4010 | ||
4011 | ||
251a2a95 | 4012 | /** |
e114e473 CS |
4013 | * smack_secid_to_secctx - return the smack label for a secid |
4014 | * @secid: incoming integer | |
4015 | * @secdata: destination | |
4016 | * @seclen: how long it is | |
4017 | * | |
4018 | * Exists for networking code. | |
4019 | */ | |
4020 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4021 | { | |
2f823ff8 | 4022 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4023 | |
d5630b9d | 4024 | if (secdata) |
2f823ff8 CS |
4025 | *secdata = skp->smk_known; |
4026 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4027 | return 0; |
4028 | } | |
4029 | ||
251a2a95 | 4030 | /** |
4bc87e62 CS |
4031 | * smack_secctx_to_secid - return the secid for a smack label |
4032 | * @secdata: smack label | |
4033 | * @seclen: how long result is | |
4034 | * @secid: outgoing integer | |
4035 | * | |
4036 | * Exists for audit and networking code. | |
4037 | */ | |
e52c1764 | 4038 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
4039 | { |
4040 | *secid = smack_to_secid(secdata); | |
4041 | return 0; | |
4042 | } | |
4043 | ||
251a2a95 | 4044 | /** |
e114e473 | 4045 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
4046 | * @secdata: unused |
4047 | * @seclen: unused | |
e114e473 CS |
4048 | * |
4049 | * Exists to make sure nothing gets done, and properly | |
4050 | */ | |
4051 | static void smack_release_secctx(char *secdata, u32 seclen) | |
4052 | { | |
4053 | } | |
4054 | ||
1ee65e37 DQ |
4055 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4056 | { | |
4057 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4058 | } | |
4059 | ||
4060 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4061 | { | |
4062 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4063 | } | |
4064 | ||
4065 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4066 | { | |
4067 | int len = 0; | |
4068 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4069 | ||
4070 | if (len < 0) | |
4071 | return len; | |
4072 | *ctxlen = len; | |
4073 | return 0; | |
4074 | } | |
4075 | ||
076c54c5 AD |
4076 | struct security_operations smack_ops = { |
4077 | .name = "smack", | |
4078 | ||
9e48858f | 4079 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 4080 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 4081 | .syslog = smack_syslog, |
e114e473 CS |
4082 | |
4083 | .sb_alloc_security = smack_sb_alloc_security, | |
4084 | .sb_free_security = smack_sb_free_security, | |
4085 | .sb_copy_data = smack_sb_copy_data, | |
4086 | .sb_kern_mount = smack_sb_kern_mount, | |
4087 | .sb_statfs = smack_sb_statfs, | |
e114e473 | 4088 | |
676dac4b | 4089 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
4090 | .bprm_committing_creds = smack_bprm_committing_creds, |
4091 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 4092 | |
e114e473 CS |
4093 | .inode_alloc_security = smack_inode_alloc_security, |
4094 | .inode_free_security = smack_inode_free_security, | |
4095 | .inode_init_security = smack_inode_init_security, | |
4096 | .inode_link = smack_inode_link, | |
4097 | .inode_unlink = smack_inode_unlink, | |
4098 | .inode_rmdir = smack_inode_rmdir, | |
4099 | .inode_rename = smack_inode_rename, | |
4100 | .inode_permission = smack_inode_permission, | |
4101 | .inode_setattr = smack_inode_setattr, | |
4102 | .inode_getattr = smack_inode_getattr, | |
4103 | .inode_setxattr = smack_inode_setxattr, | |
4104 | .inode_post_setxattr = smack_inode_post_setxattr, | |
4105 | .inode_getxattr = smack_inode_getxattr, | |
4106 | .inode_removexattr = smack_inode_removexattr, | |
4107 | .inode_getsecurity = smack_inode_getsecurity, | |
4108 | .inode_setsecurity = smack_inode_setsecurity, | |
4109 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 4110 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
4111 | |
4112 | .file_permission = smack_file_permission, | |
4113 | .file_alloc_security = smack_file_alloc_security, | |
4114 | .file_free_security = smack_file_free_security, | |
4115 | .file_ioctl = smack_file_ioctl, | |
4116 | .file_lock = smack_file_lock, | |
4117 | .file_fcntl = smack_file_fcntl, | |
e5467859 AV |
4118 | .mmap_file = smack_mmap_file, |
4119 | .mmap_addr = cap_mmap_addr, | |
e114e473 CS |
4120 | .file_set_fowner = smack_file_set_fowner, |
4121 | .file_send_sigiotask = smack_file_send_sigiotask, | |
4122 | .file_receive = smack_file_receive, | |
4123 | ||
83d49856 | 4124 | .file_open = smack_file_open, |
531f1d45 | 4125 | |
ee18d64c | 4126 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 4127 | .cred_free = smack_cred_free, |
d84f4f99 | 4128 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 4129 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
4130 | .kernel_act_as = smack_kernel_act_as, |
4131 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
4132 | .task_setpgid = smack_task_setpgid, |
4133 | .task_getpgid = smack_task_getpgid, | |
4134 | .task_getsid = smack_task_getsid, | |
4135 | .task_getsecid = smack_task_getsecid, | |
4136 | .task_setnice = smack_task_setnice, | |
4137 | .task_setioprio = smack_task_setioprio, | |
4138 | .task_getioprio = smack_task_getioprio, | |
4139 | .task_setscheduler = smack_task_setscheduler, | |
4140 | .task_getscheduler = smack_task_getscheduler, | |
4141 | .task_movememory = smack_task_movememory, | |
4142 | .task_kill = smack_task_kill, | |
4143 | .task_wait = smack_task_wait, | |
e114e473 CS |
4144 | .task_to_inode = smack_task_to_inode, |
4145 | ||
4146 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 4147 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
4148 | |
4149 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
4150 | .msg_msg_free_security = smack_msg_msg_free_security, | |
4151 | ||
4152 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
4153 | .msg_queue_free_security = smack_msg_queue_free_security, | |
4154 | .msg_queue_associate = smack_msg_queue_associate, | |
4155 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
4156 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
4157 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
4158 | ||
4159 | .shm_alloc_security = smack_shm_alloc_security, | |
4160 | .shm_free_security = smack_shm_free_security, | |
4161 | .shm_associate = smack_shm_associate, | |
4162 | .shm_shmctl = smack_shm_shmctl, | |
4163 | .shm_shmat = smack_shm_shmat, | |
4164 | ||
4165 | .sem_alloc_security = smack_sem_alloc_security, | |
4166 | .sem_free_security = smack_sem_free_security, | |
4167 | .sem_associate = smack_sem_associate, | |
4168 | .sem_semctl = smack_sem_semctl, | |
4169 | .sem_semop = smack_sem_semop, | |
4170 | ||
e114e473 CS |
4171 | .d_instantiate = smack_d_instantiate, |
4172 | ||
4173 | .getprocattr = smack_getprocattr, | |
4174 | .setprocattr = smack_setprocattr, | |
4175 | ||
4176 | .unix_stream_connect = smack_unix_stream_connect, | |
4177 | .unix_may_send = smack_unix_may_send, | |
4178 | ||
4179 | .socket_post_create = smack_socket_post_create, | |
c6739443 | 4180 | .socket_bind = smack_socket_bind, |
6d3dc07c CS |
4181 | .socket_connect = smack_socket_connect, |
4182 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
4183 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
4184 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
4185 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
4186 | .sk_alloc_security = smack_sk_alloc_security, | |
4187 | .sk_free_security = smack_sk_free_security, | |
4188 | .sock_graft = smack_sock_graft, | |
4189 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 4190 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 4191 | |
e114e473 CS |
4192 | /* key management security hooks */ |
4193 | #ifdef CONFIG_KEYS | |
4194 | .key_alloc = smack_key_alloc, | |
4195 | .key_free = smack_key_free, | |
4196 | .key_permission = smack_key_permission, | |
4197 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
4198 | |
4199 | /* Audit hooks */ | |
4200 | #ifdef CONFIG_AUDIT | |
4201 | .audit_rule_init = smack_audit_rule_init, | |
4202 | .audit_rule_known = smack_audit_rule_known, | |
4203 | .audit_rule_match = smack_audit_rule_match, | |
4204 | .audit_rule_free = smack_audit_rule_free, | |
4205 | #endif /* CONFIG_AUDIT */ | |
4206 | ||
746df9b5 | 4207 | .ismaclabel = smack_ismaclabel, |
e114e473 | 4208 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 4209 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 4210 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
4211 | .inode_notifysecctx = smack_inode_notifysecctx, |
4212 | .inode_setsecctx = smack_inode_setsecctx, | |
4213 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
4214 | }; |
4215 | ||
7198e2ee | 4216 | |
86812bb0 | 4217 | static __init void init_smack_known_list(void) |
7198e2ee | 4218 | { |
86812bb0 CS |
4219 | /* |
4220 | * Initialize rule list locks | |
4221 | */ | |
4222 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4223 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4224 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4225 | mutex_init(&smack_known_star.smk_rules_lock); | |
4226 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4227 | mutex_init(&smack_known_web.smk_rules_lock); | |
4228 | /* | |
4229 | * Initialize rule lists | |
4230 | */ | |
4231 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4232 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4233 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4234 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4235 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4236 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4237 | /* | |
4238 | * Create the known labels list | |
4239 | */ | |
4d7cf4a1 TS |
4240 | smk_insert_entry(&smack_known_huh); |
4241 | smk_insert_entry(&smack_known_hat); | |
4242 | smk_insert_entry(&smack_known_star); | |
4243 | smk_insert_entry(&smack_known_floor); | |
4244 | smk_insert_entry(&smack_known_invalid); | |
4245 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4246 | } |
4247 | ||
e114e473 CS |
4248 | /** |
4249 | * smack_init - initialize the smack system | |
4250 | * | |
4251 | * Returns 0 | |
4252 | */ | |
4253 | static __init int smack_init(void) | |
4254 | { | |
d84f4f99 | 4255 | struct cred *cred; |
676dac4b | 4256 | struct task_smack *tsp; |
d84f4f99 | 4257 | |
7898e1f8 CS |
4258 | if (!security_module_enable(&smack_ops)) |
4259 | return 0; | |
4260 | ||
2f823ff8 CS |
4261 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4262 | GFP_KERNEL); | |
676dac4b CS |
4263 | if (tsp == NULL) |
4264 | return -ENOMEM; | |
4265 | ||
e114e473 CS |
4266 | printk(KERN_INFO "Smack: Initializing.\n"); |
4267 | ||
4268 | /* | |
4269 | * Set the security state for the initial task. | |
4270 | */ | |
d84f4f99 | 4271 | cred = (struct cred *) current->cred; |
676dac4b | 4272 | cred->security = tsp; |
e114e473 | 4273 | |
86812bb0 CS |
4274 | /* initialize the smack_known_list */ |
4275 | init_smack_known_list(); | |
e114e473 CS |
4276 | |
4277 | /* | |
4278 | * Register with LSM | |
4279 | */ | |
4280 | if (register_security(&smack_ops)) | |
4281 | panic("smack: Unable to register with kernel.\n"); | |
4282 | ||
4283 | return 0; | |
4284 | } | |
4285 | ||
4286 | /* | |
4287 | * Smack requires early initialization in order to label | |
4288 | * all processes and objects when they are created. | |
4289 | */ | |
4290 | security_initcall(smack_init); |