]>
Commit | Line | Data |
---|---|---|
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 | |
21c7eae2 LP |
81 | static int smk_bu_note(char *note, struct smack_known *sskp, |
82 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
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", | |
21c7eae2 | 91 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
92 | return 0; |
93 | } | |
94 | #else | |
21c7eae2 | 95 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
96 | #endif |
97 | ||
98 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
99 | static int smk_bu_current(char *note, struct smack_known *oskp, |
100 | int mode, int rc) | |
d166c802 CS |
101 | { |
102 | struct task_smack *tsp = current_security(); | |
103 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
104 | ||
105 | if (rc <= 0) | |
106 | return rc; | |
107 | ||
108 | smk_bu_mode(mode, acc); | |
109 | pr_info("Smack Bringup: (%s %s %s) %s %s\n", | |
21c7eae2 LP |
110 | tsp->smk_task->smk_known, oskp->smk_known, |
111 | acc, current->comm, note); | |
d166c802 CS |
112 | return 0; |
113 | } | |
114 | #else | |
21c7eae2 | 115 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
116 | #endif |
117 | ||
118 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
119 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
120 | { | |
121 | struct task_smack *tsp = current_security(); | |
122 | struct task_smack *otsp = task_security(otp); | |
123 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
124 | ||
125 | if (rc <= 0) | |
126 | return rc; | |
127 | ||
128 | smk_bu_mode(mode, acc); | |
129 | pr_info("Smack Bringup: (%s %s %s) %s to %s\n", | |
130 | tsp->smk_task->smk_known, otsp->smk_task->smk_known, acc, | |
131 | current->comm, otp->comm); | |
132 | return 0; | |
133 | } | |
134 | #else | |
135 | #define smk_bu_task(otp, mode, RC) (RC) | |
136 | #endif | |
137 | ||
138 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
139 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
140 | { | |
141 | struct task_smack *tsp = current_security(); | |
142 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
143 | ||
144 | if (rc <= 0) | |
145 | return rc; | |
146 | ||
147 | smk_bu_mode(mode, acc); | |
148 | pr_info("Smack Bringup: (%s %s %s) inode=(%s %ld) %s\n", | |
21c7eae2 | 149 | tsp->smk_task->smk_known, smk_of_inode(inode)->smk_known, acc, |
d166c802 CS |
150 | inode->i_sb->s_id, inode->i_ino, current->comm); |
151 | return 0; | |
152 | } | |
153 | #else | |
154 | #define smk_bu_inode(inode, mode, RC) (RC) | |
155 | #endif | |
156 | ||
157 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
158 | static int smk_bu_file(struct file *file, int mode, int rc) | |
159 | { | |
160 | struct task_smack *tsp = current_security(); | |
161 | struct smack_known *sskp = tsp->smk_task; | |
162 | struct inode *inode = file->f_inode; | |
163 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
164 | ||
165 | if (rc <= 0) | |
166 | return rc; | |
167 | ||
168 | smk_bu_mode(mode, acc); | |
a455589f | 169 | pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n", |
d166c802 | 170 | sskp->smk_known, (char *)file->f_security, acc, |
a455589f | 171 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
172 | current->comm); |
173 | return 0; | |
174 | } | |
175 | #else | |
176 | #define smk_bu_file(file, mode, RC) (RC) | |
177 | #endif | |
178 | ||
179 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
180 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
181 | int mode, int rc) | |
182 | { | |
183 | struct task_smack *tsp = cred->security; | |
184 | struct smack_known *sskp = tsp->smk_task; | |
185 | struct inode *inode = file->f_inode; | |
186 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
187 | ||
188 | if (rc <= 0) | |
189 | return rc; | |
190 | ||
191 | smk_bu_mode(mode, acc); | |
a455589f | 192 | pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n", |
21c7eae2 | 193 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 194 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
195 | current->comm); |
196 | return 0; | |
197 | } | |
198 | #else | |
199 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
200 | #endif | |
201 | ||
e114e473 CS |
202 | /** |
203 | * smk_fetch - Fetch the smack label from a file. | |
204 | * @ip: a pointer to the inode | |
205 | * @dp: a pointer to the dentry | |
206 | * | |
207 | * Returns a pointer to the master list entry for the Smack label | |
208 | * or NULL if there was no label to fetch. | |
209 | */ | |
2f823ff8 CS |
210 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
211 | struct dentry *dp) | |
e114e473 CS |
212 | { |
213 | int rc; | |
f7112e6c | 214 | char *buffer; |
2f823ff8 | 215 | struct smack_known *skp = NULL; |
e114e473 CS |
216 | |
217 | if (ip->i_op->getxattr == NULL) | |
218 | return NULL; | |
219 | ||
f7112e6c CS |
220 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
221 | if (buffer == NULL) | |
e114e473 CS |
222 | return NULL; |
223 | ||
f7112e6c CS |
224 | rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); |
225 | if (rc > 0) | |
2f823ff8 | 226 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
227 | |
228 | kfree(buffer); | |
229 | ||
2f823ff8 | 230 | return skp; |
e114e473 CS |
231 | } |
232 | ||
233 | /** | |
234 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 235 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
236 | * |
237 | * Returns the new blob or NULL if there's no memory available | |
238 | */ | |
21c7eae2 | 239 | struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
240 | { |
241 | struct inode_smack *isp; | |
242 | ||
ceffec55 | 243 | isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); |
e114e473 CS |
244 | if (isp == NULL) |
245 | return NULL; | |
246 | ||
21c7eae2 | 247 | isp->smk_inode = skp; |
e114e473 CS |
248 | isp->smk_flags = 0; |
249 | mutex_init(&isp->smk_lock); | |
250 | ||
251 | return isp; | |
252 | } | |
253 | ||
7898e1f8 CS |
254 | /** |
255 | * new_task_smack - allocate a task security blob | |
256 | * @smack: a pointer to the Smack label to use in the blob | |
257 | * | |
258 | * Returns the new blob or NULL if there's no memory available | |
259 | */ | |
2f823ff8 CS |
260 | static struct task_smack *new_task_smack(struct smack_known *task, |
261 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
262 | { |
263 | struct task_smack *tsp; | |
264 | ||
265 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
266 | if (tsp == NULL) | |
267 | return NULL; | |
268 | ||
269 | tsp->smk_task = task; | |
270 | tsp->smk_forked = forked; | |
271 | INIT_LIST_HEAD(&tsp->smk_rules); | |
272 | mutex_init(&tsp->smk_rules_lock); | |
273 | ||
274 | return tsp; | |
275 | } | |
276 | ||
277 | /** | |
278 | * smk_copy_rules - copy a rule set | |
279 | * @nhead - new rules header pointer | |
280 | * @ohead - old rules header pointer | |
281 | * | |
282 | * Returns 0 on success, -ENOMEM on error | |
283 | */ | |
284 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
285 | gfp_t gfp) | |
286 | { | |
287 | struct smack_rule *nrp; | |
288 | struct smack_rule *orp; | |
289 | int rc = 0; | |
290 | ||
291 | INIT_LIST_HEAD(nhead); | |
292 | ||
293 | list_for_each_entry_rcu(orp, ohead, list) { | |
294 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
295 | if (nrp == NULL) { | |
296 | rc = -ENOMEM; | |
297 | break; | |
298 | } | |
299 | *nrp = *orp; | |
300 | list_add_rcu(&nrp->list, nhead); | |
301 | } | |
302 | return rc; | |
303 | } | |
304 | ||
5663884c LP |
305 | /** |
306 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
307 | * @mode - input mode in form of PTRACE_MODE_* | |
308 | * | |
309 | * Returns a converted MAY_* mode usable by smack rules | |
310 | */ | |
311 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
312 | { | |
313 | switch (mode) { | |
314 | case PTRACE_MODE_READ: | |
315 | return MAY_READ; | |
316 | case PTRACE_MODE_ATTACH: | |
317 | return MAY_READWRITE; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | /** | |
324 | * smk_ptrace_rule_check - helper for ptrace access | |
325 | * @tracer: tracer process | |
21c7eae2 | 326 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
327 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
328 | * @func: name of the function that called us, used for audit | |
329 | * | |
330 | * Returns 0 on access granted, -error on error | |
331 | */ | |
21c7eae2 LP |
332 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
333 | struct smack_known *tracee_known, | |
5663884c LP |
334 | unsigned int mode, const char *func) |
335 | { | |
336 | int rc; | |
337 | struct smk_audit_info ad, *saip = NULL; | |
338 | struct task_smack *tsp; | |
21c7eae2 | 339 | struct smack_known *tracer_known; |
5663884c LP |
340 | |
341 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
342 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
343 | smk_ad_setfield_u_tsk(&ad, tracer); | |
344 | saip = &ad; | |
345 | } | |
346 | ||
347 | tsp = task_security(tracer); | |
21c7eae2 | 348 | tracer_known = smk_of_task(tsp); |
5663884c | 349 | |
66867818 LP |
350 | if ((mode & PTRACE_MODE_ATTACH) && |
351 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
352 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 353 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
354 | rc = 0; |
355 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
356 | rc = -EACCES; | |
357 | else if (capable(CAP_SYS_PTRACE)) | |
358 | rc = 0; | |
359 | else | |
360 | rc = -EACCES; | |
361 | ||
362 | if (saip) | |
21c7eae2 LP |
363 | smack_log(tracer_known->smk_known, |
364 | tracee_known->smk_known, | |
365 | 0, rc, saip); | |
66867818 LP |
366 | |
367 | return rc; | |
368 | } | |
369 | ||
370 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 371 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
5663884c LP |
372 | return rc; |
373 | } | |
374 | ||
e114e473 CS |
375 | /* |
376 | * LSM hooks. | |
377 | * We he, that is fun! | |
378 | */ | |
379 | ||
380 | /** | |
9e48858f | 381 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 382 | * @ctp: child task pointer |
5663884c | 383 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
384 | * |
385 | * Returns 0 if access is OK, an error code otherwise | |
386 | * | |
5663884c | 387 | * Do the capability checks. |
e114e473 | 388 | */ |
9e48858f | 389 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
390 | { |
391 | int rc; | |
2f823ff8 | 392 | struct smack_known *skp; |
e114e473 | 393 | |
9e48858f | 394 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
395 | if (rc != 0) |
396 | return rc; | |
397 | ||
2f823ff8 | 398 | skp = smk_of_task(task_security(ctp)); |
ecfcc53f | 399 | |
21c7eae2 | 400 | rc = smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
401 | return rc; |
402 | } | |
403 | ||
404 | /** | |
405 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
406 | * @ptp: parent task pointer | |
407 | * | |
408 | * Returns 0 if access is OK, an error code otherwise | |
409 | * | |
5663884c | 410 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
411 | */ |
412 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
413 | { | |
414 | int rc; | |
2f823ff8 | 415 | struct smack_known *skp; |
5cd9c58f DH |
416 | |
417 | rc = cap_ptrace_traceme(ptp); | |
418 | if (rc != 0) | |
419 | return rc; | |
e114e473 | 420 | |
959e6c7f | 421 | skp = smk_of_task(current_security()); |
ecfcc53f | 422 | |
21c7eae2 | 423 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
424 | return rc; |
425 | } | |
426 | ||
427 | /** | |
428 | * smack_syslog - Smack approval on syslog | |
429 | * @type: message type | |
430 | * | |
e114e473 CS |
431 | * Returns 0 on success, error code otherwise. |
432 | */ | |
12b3052c | 433 | static int smack_syslog(int typefrom_file) |
e114e473 | 434 | { |
12b3052c | 435 | int rc = 0; |
2f823ff8 | 436 | struct smack_known *skp = smk_of_current(); |
e114e473 | 437 | |
1880eff7 | 438 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
439 | return 0; |
440 | ||
24ea1b6e | 441 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
442 | rc = -EACCES; |
443 | ||
444 | return rc; | |
445 | } | |
446 | ||
447 | ||
448 | /* | |
449 | * Superblock Hooks. | |
450 | */ | |
451 | ||
452 | /** | |
453 | * smack_sb_alloc_security - allocate a superblock blob | |
454 | * @sb: the superblock getting the blob | |
455 | * | |
456 | * Returns 0 on success or -ENOMEM on error. | |
457 | */ | |
458 | static int smack_sb_alloc_security(struct super_block *sb) | |
459 | { | |
460 | struct superblock_smack *sbsp; | |
461 | ||
462 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
463 | ||
464 | if (sbsp == NULL) | |
465 | return -ENOMEM; | |
466 | ||
21c7eae2 LP |
467 | sbsp->smk_root = &smack_known_floor; |
468 | sbsp->smk_default = &smack_known_floor; | |
469 | sbsp->smk_floor = &smack_known_floor; | |
470 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 CS |
471 | /* |
472 | * smk_initialized will be zero from kzalloc. | |
473 | */ | |
e114e473 CS |
474 | sb->s_security = sbsp; |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /** | |
480 | * smack_sb_free_security - free a superblock blob | |
481 | * @sb: the superblock getting the blob | |
482 | * | |
483 | */ | |
484 | static void smack_sb_free_security(struct super_block *sb) | |
485 | { | |
486 | kfree(sb->s_security); | |
487 | sb->s_security = NULL; | |
488 | } | |
489 | ||
490 | /** | |
491 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 492 | * @orig: where to start |
251a2a95 | 493 | * @smackopts: mount options string |
e114e473 CS |
494 | * |
495 | * Returns 0 on success or -ENOMEM on error. | |
496 | * | |
497 | * Copy the Smack specific mount options out of the mount | |
498 | * options list. | |
499 | */ | |
e0007529 | 500 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
501 | { |
502 | char *cp, *commap, *otheropts, *dp; | |
503 | ||
e114e473 CS |
504 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
505 | if (otheropts == NULL) | |
506 | return -ENOMEM; | |
507 | ||
508 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
509 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
510 | dp = smackopts; | |
511 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
512 | dp = smackopts; | |
513 | else if (strstr(cp, SMK_FSHAT) == cp) | |
514 | dp = smackopts; | |
515 | else if (strstr(cp, SMK_FSROOT) == cp) | |
516 | dp = smackopts; | |
e830b394 CS |
517 | else if (strstr(cp, SMK_FSTRANS) == cp) |
518 | dp = smackopts; | |
e114e473 CS |
519 | else |
520 | dp = otheropts; | |
521 | ||
522 | commap = strchr(cp, ','); | |
523 | if (commap != NULL) | |
524 | *commap = '\0'; | |
525 | ||
526 | if (*dp != '\0') | |
527 | strcat(dp, ","); | |
528 | strcat(dp, cp); | |
529 | } | |
530 | ||
531 | strcpy(orig, otheropts); | |
532 | free_page((unsigned long)otheropts); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | /** | |
538 | * smack_sb_kern_mount - Smack specific mount processing | |
539 | * @sb: the file system superblock | |
12204e24 | 540 | * @flags: the mount flags |
e114e473 CS |
541 | * @data: the smack mount options |
542 | * | |
543 | * Returns 0 on success, an error code on failure | |
544 | */ | |
12204e24 | 545 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
546 | { |
547 | struct dentry *root = sb->s_root; | |
548 | struct inode *inode = root->d_inode; | |
549 | struct superblock_smack *sp = sb->s_security; | |
550 | struct inode_smack *isp; | |
24ea1b6e | 551 | struct smack_known *skp; |
e114e473 CS |
552 | char *op; |
553 | char *commap; | |
e830b394 | 554 | int transmute = 0; |
24ea1b6e | 555 | int specified = 0; |
e114e473 | 556 | |
e830b394 | 557 | if (sp->smk_initialized) |
e114e473 | 558 | return 0; |
eb982cb4 | 559 | |
e114e473 | 560 | sp->smk_initialized = 1; |
e114e473 CS |
561 | |
562 | for (op = data; op != NULL; op = commap) { | |
563 | commap = strchr(op, ','); | |
564 | if (commap != NULL) | |
565 | *commap++ = '\0'; | |
566 | ||
567 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
568 | op += strlen(SMK_FSHAT); | |
21c7eae2 LP |
569 | skp = smk_import_entry(op, 0); |
570 | if (skp != NULL) { | |
571 | sp->smk_hat = skp; | |
24ea1b6e CS |
572 | specified = 1; |
573 | } | |
e114e473 CS |
574 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { |
575 | op += strlen(SMK_FSFLOOR); | |
21c7eae2 LP |
576 | skp = smk_import_entry(op, 0); |
577 | if (skp != NULL) { | |
578 | sp->smk_floor = skp; | |
24ea1b6e CS |
579 | specified = 1; |
580 | } | |
e114e473 CS |
581 | } else if (strncmp(op, SMK_FSDEFAULT, |
582 | strlen(SMK_FSDEFAULT)) == 0) { | |
583 | op += strlen(SMK_FSDEFAULT); | |
21c7eae2 LP |
584 | skp = smk_import_entry(op, 0); |
585 | if (skp != NULL) { | |
586 | sp->smk_default = skp; | |
24ea1b6e CS |
587 | specified = 1; |
588 | } | |
e114e473 CS |
589 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { |
590 | op += strlen(SMK_FSROOT); | |
21c7eae2 LP |
591 | skp = smk_import_entry(op, 0); |
592 | if (skp != NULL) { | |
593 | sp->smk_root = skp; | |
24ea1b6e CS |
594 | specified = 1; |
595 | } | |
e830b394 CS |
596 | } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { |
597 | op += strlen(SMK_FSTRANS); | |
21c7eae2 LP |
598 | skp = smk_import_entry(op, 0); |
599 | if (skp != NULL) { | |
600 | sp->smk_root = skp; | |
e830b394 | 601 | transmute = 1; |
24ea1b6e | 602 | specified = 1; |
e830b394 | 603 | } |
e114e473 CS |
604 | } |
605 | } | |
606 | ||
24ea1b6e CS |
607 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
608 | /* | |
609 | * Unprivileged mounts don't get to specify Smack values. | |
610 | */ | |
611 | if (specified) | |
612 | return -EPERM; | |
613 | /* | |
614 | * Unprivileged mounts get root and default from the caller. | |
615 | */ | |
616 | skp = smk_of_current(); | |
21c7eae2 LP |
617 | sp->smk_root = skp; |
618 | sp->smk_default = skp; | |
24ea1b6e | 619 | } |
e114e473 CS |
620 | /* |
621 | * Initialize the root inode. | |
622 | */ | |
623 | isp = inode->i_security; | |
55dfc5da JB |
624 | if (isp == NULL) { |
625 | isp = new_inode_smack(sp->smk_root); | |
626 | if (isp == NULL) | |
627 | return -ENOMEM; | |
628 | inode->i_security = isp; | |
e830b394 | 629 | } else |
e114e473 CS |
630 | isp->smk_inode = sp->smk_root; |
631 | ||
e830b394 CS |
632 | if (transmute) |
633 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
634 | ||
e114e473 CS |
635 | return 0; |
636 | } | |
637 | ||
638 | /** | |
639 | * smack_sb_statfs - Smack check on statfs | |
640 | * @dentry: identifies the file system in question | |
641 | * | |
642 | * Returns 0 if current can read the floor of the filesystem, | |
643 | * and error code otherwise | |
644 | */ | |
645 | static int smack_sb_statfs(struct dentry *dentry) | |
646 | { | |
647 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
648 | int rc; |
649 | struct smk_audit_info ad; | |
650 | ||
a269434d | 651 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 652 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 653 | |
ecfcc53f | 654 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 655 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 656 | return rc; |
e114e473 CS |
657 | } |
658 | ||
676dac4b CS |
659 | /* |
660 | * BPRM hooks | |
661 | */ | |
662 | ||
ce8a4321 CS |
663 | /** |
664 | * smack_bprm_set_creds - set creds for exec | |
665 | * @bprm: the exec information | |
666 | * | |
5663884c | 667 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 668 | */ |
676dac4b CS |
669 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
670 | { | |
496ad9aa | 671 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 672 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 673 | struct inode_smack *isp; |
676dac4b CS |
674 | int rc; |
675 | ||
676 | rc = cap_bprm_set_creds(bprm); | |
677 | if (rc != 0) | |
678 | return rc; | |
679 | ||
680 | if (bprm->cred_prepared) | |
681 | return 0; | |
682 | ||
84088ba2 JS |
683 | isp = inode->i_security; |
684 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
685 | return 0; |
686 | ||
5663884c LP |
687 | if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
688 | struct task_struct *tracer; | |
689 | rc = 0; | |
690 | ||
691 | rcu_read_lock(); | |
692 | tracer = ptrace_parent(current); | |
693 | if (likely(tracer != NULL)) | |
694 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 695 | isp->smk_task, |
5663884c LP |
696 | PTRACE_MODE_ATTACH, |
697 | __func__); | |
698 | rcu_read_unlock(); | |
699 | ||
700 | if (rc != 0) | |
701 | return rc; | |
702 | } else if (bprm->unsafe) | |
84088ba2 | 703 | return -EPERM; |
676dac4b | 704 | |
84088ba2 JS |
705 | bsp->smk_task = isp->smk_task; |
706 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 707 | |
84088ba2 JS |
708 | return 0; |
709 | } | |
676dac4b | 710 | |
84088ba2 JS |
711 | /** |
712 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
713 | * from bprm. | |
714 | * | |
715 | * @bprm: binprm for exec | |
716 | */ | |
717 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
718 | { | |
719 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 720 | |
84088ba2 JS |
721 | if (bsp->smk_task != bsp->smk_forked) |
722 | current->pdeath_signal = 0; | |
723 | } | |
724 | ||
725 | /** | |
726 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
727 | * @bprm: binprm for exec | |
728 | * | |
729 | * Returns 0 on success. | |
730 | */ | |
731 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
732 | { | |
733 | struct task_smack *tsp = current_security(); | |
734 | int ret = cap_bprm_secureexec(bprm); | |
735 | ||
736 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
737 | ret = 1; | |
738 | ||
739 | return ret; | |
676dac4b CS |
740 | } |
741 | ||
e114e473 CS |
742 | /* |
743 | * Inode hooks | |
744 | */ | |
745 | ||
746 | /** | |
747 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 748 | * @inode: the inode in need of a blob |
e114e473 CS |
749 | * |
750 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
751 | */ | |
752 | static int smack_inode_alloc_security(struct inode *inode) | |
753 | { | |
2f823ff8 CS |
754 | struct smack_known *skp = smk_of_current(); |
755 | ||
21c7eae2 | 756 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
757 | if (inode->i_security == NULL) |
758 | return -ENOMEM; | |
759 | return 0; | |
760 | } | |
761 | ||
762 | /** | |
763 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 764 | * @inode: the inode with a blob |
e114e473 CS |
765 | * |
766 | * Clears the blob pointer in inode | |
767 | */ | |
768 | static void smack_inode_free_security(struct inode *inode) | |
769 | { | |
770 | kfree(inode->i_security); | |
771 | inode->i_security = NULL; | |
772 | } | |
773 | ||
774 | /** | |
775 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
776 | * @inode: the newly created inode |
777 | * @dir: containing directory object | |
2a7dba39 | 778 | * @qstr: unused |
e114e473 CS |
779 | * @name: where to put the attribute name |
780 | * @value: where to put the attribute value | |
781 | * @len: where to put the length of the attribute | |
782 | * | |
783 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
784 | */ | |
785 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 786 | const struct qstr *qstr, const char **name, |
2a7dba39 | 787 | void **value, size_t *len) |
e114e473 | 788 | { |
2267b13a | 789 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 790 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
791 | struct smack_known *isp = smk_of_inode(inode); |
792 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 793 | int may; |
e114e473 | 794 | |
9548906b TH |
795 | if (name) |
796 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 CS |
797 | |
798 | if (value) { | |
7898e1f8 | 799 | rcu_read_lock(); |
21c7eae2 LP |
800 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
801 | &skp->smk_rules); | |
7898e1f8 | 802 | rcu_read_unlock(); |
5c6d1125 JS |
803 | |
804 | /* | |
805 | * If the access rule allows transmutation and | |
806 | * the directory requests transmutation then | |
807 | * by all means transmute. | |
2267b13a | 808 | * Mark the inode as changed. |
5c6d1125 | 809 | */ |
7898e1f8 | 810 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 811 | smk_inode_transmutable(dir)) { |
5c6d1125 | 812 | isp = dsp; |
2267b13a CS |
813 | issp->smk_flags |= SMK_INODE_CHANGED; |
814 | } | |
5c6d1125 | 815 | |
21c7eae2 | 816 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
817 | if (*value == NULL) |
818 | return -ENOMEM; | |
819 | } | |
820 | ||
821 | if (len) | |
21c7eae2 | 822 | *len = strlen(isp->smk_known); |
e114e473 CS |
823 | |
824 | return 0; | |
825 | } | |
826 | ||
827 | /** | |
828 | * smack_inode_link - Smack check on link | |
829 | * @old_dentry: the existing object | |
830 | * @dir: unused | |
831 | * @new_dentry: the new object | |
832 | * | |
833 | * Returns 0 if access is permitted, an error code otherwise | |
834 | */ | |
835 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
836 | struct dentry *new_dentry) | |
837 | { | |
21c7eae2 | 838 | struct smack_known *isp; |
ecfcc53f EB |
839 | struct smk_audit_info ad; |
840 | int rc; | |
841 | ||
a269434d | 842 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 843 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
844 | |
845 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 846 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
d166c802 | 847 | rc = smk_bu_inode(old_dentry->d_inode, MAY_WRITE, rc); |
e114e473 CS |
848 | |
849 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
850 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
851 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
852 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
d166c802 | 853 | rc = smk_bu_inode(new_dentry->d_inode, MAY_WRITE, rc); |
e114e473 CS |
854 | } |
855 | ||
856 | return rc; | |
857 | } | |
858 | ||
859 | /** | |
860 | * smack_inode_unlink - Smack check on inode deletion | |
861 | * @dir: containing directory object | |
862 | * @dentry: file to unlink | |
863 | * | |
864 | * Returns 0 if current can write the containing directory | |
865 | * and the object, error code otherwise | |
866 | */ | |
867 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
868 | { | |
869 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 870 | struct smk_audit_info ad; |
e114e473 CS |
871 | int rc; |
872 | ||
a269434d | 873 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
874 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
875 | ||
e114e473 CS |
876 | /* |
877 | * You need write access to the thing you're unlinking | |
878 | */ | |
ecfcc53f | 879 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 880 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 881 | if (rc == 0) { |
e114e473 CS |
882 | /* |
883 | * You also need write access to the containing directory | |
884 | */ | |
cdb56b60 | 885 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
886 | smk_ad_setfield_u_fs_inode(&ad, dir); |
887 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 888 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 889 | } |
e114e473 CS |
890 | return rc; |
891 | } | |
892 | ||
893 | /** | |
894 | * smack_inode_rmdir - Smack check on directory deletion | |
895 | * @dir: containing directory object | |
896 | * @dentry: directory to unlink | |
897 | * | |
898 | * Returns 0 if current can write the containing directory | |
899 | * and the directory, error code otherwise | |
900 | */ | |
901 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
902 | { | |
ecfcc53f | 903 | struct smk_audit_info ad; |
e114e473 CS |
904 | int rc; |
905 | ||
a269434d | 906 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
907 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
908 | ||
e114e473 CS |
909 | /* |
910 | * You need write access to the thing you're removing | |
911 | */ | |
ecfcc53f | 912 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 | 913 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
ecfcc53f | 914 | if (rc == 0) { |
e114e473 CS |
915 | /* |
916 | * You also need write access to the containing directory | |
917 | */ | |
cdb56b60 | 918 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
919 | smk_ad_setfield_u_fs_inode(&ad, dir); |
920 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 921 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 922 | } |
e114e473 CS |
923 | |
924 | return rc; | |
925 | } | |
926 | ||
927 | /** | |
928 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
929 | * @old_inode: unused |
930 | * @old_dentry: the old object | |
931 | * @new_inode: unused | |
932 | * @new_dentry: the new object | |
e114e473 CS |
933 | * |
934 | * Read and write access is required on both the old and | |
935 | * new directories. | |
936 | * | |
937 | * Returns 0 if access is permitted, an error code otherwise | |
938 | */ | |
939 | static int smack_inode_rename(struct inode *old_inode, | |
940 | struct dentry *old_dentry, | |
941 | struct inode *new_inode, | |
942 | struct dentry *new_dentry) | |
943 | { | |
944 | int rc; | |
21c7eae2 | 945 | struct smack_known *isp; |
ecfcc53f EB |
946 | struct smk_audit_info ad; |
947 | ||
a269434d | 948 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 949 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
950 | |
951 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 952 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
d166c802 | 953 | rc = smk_bu_inode(old_dentry->d_inode, MAY_READWRITE, rc); |
e114e473 CS |
954 | |
955 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
956 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
957 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
958 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
d166c802 | 959 | rc = smk_bu_inode(new_dentry->d_inode, MAY_READWRITE, rc); |
e114e473 | 960 | } |
e114e473 CS |
961 | return rc; |
962 | } | |
963 | ||
964 | /** | |
965 | * smack_inode_permission - Smack version of permission() | |
966 | * @inode: the inode in question | |
967 | * @mask: the access requested | |
e114e473 CS |
968 | * |
969 | * This is the important Smack hook. | |
970 | * | |
971 | * Returns 0 if access is permitted, -EACCES otherwise | |
972 | */ | |
e74f71eb | 973 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 974 | { |
ecfcc53f | 975 | struct smk_audit_info ad; |
e74f71eb | 976 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 977 | int rc; |
d09ca739 EP |
978 | |
979 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
980 | /* |
981 | * No permission to check. Existence test. Yup, it's there. | |
982 | */ | |
983 | if (mask == 0) | |
984 | return 0; | |
8c9e80ed AK |
985 | |
986 | /* May be droppable after audit */ | |
e74f71eb | 987 | if (no_block) |
8c9e80ed | 988 | return -ECHILD; |
f48b7399 | 989 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 990 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
991 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
992 | rc = smk_bu_inode(inode, mask, rc); | |
993 | return rc; | |
e114e473 CS |
994 | } |
995 | ||
996 | /** | |
997 | * smack_inode_setattr - Smack check for setting attributes | |
998 | * @dentry: the object | |
999 | * @iattr: for the force flag | |
1000 | * | |
1001 | * Returns 0 if access is permitted, an error code otherwise | |
1002 | */ | |
1003 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1004 | { | |
ecfcc53f | 1005 | struct smk_audit_info ad; |
d166c802 CS |
1006 | int rc; |
1007 | ||
e114e473 CS |
1008 | /* |
1009 | * Need to allow for clearing the setuid bit. | |
1010 | */ | |
1011 | if (iattr->ia_valid & ATTR_FORCE) | |
1012 | return 0; | |
a269434d | 1013 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1014 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1015 | |
d166c802 CS |
1016 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
1017 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); | |
1018 | return rc; | |
e114e473 CS |
1019 | } |
1020 | ||
1021 | /** | |
1022 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1023 | * @mnt: vfsmount of the object |
e114e473 CS |
1024 | * @dentry: the object |
1025 | * | |
1026 | * Returns 0 if access is permitted, an error code otherwise | |
1027 | */ | |
1028 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
1029 | { | |
ecfcc53f | 1030 | struct smk_audit_info ad; |
a269434d | 1031 | struct path path; |
d166c802 | 1032 | int rc; |
ecfcc53f | 1033 | |
a269434d EP |
1034 | path.dentry = dentry; |
1035 | path.mnt = mnt; | |
ecfcc53f | 1036 | |
f48b7399 | 1037 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 1038 | smk_ad_setfield_u_fs_path(&ad, path); |
d166c802 CS |
1039 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
1040 | rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc); | |
1041 | return rc; | |
e114e473 CS |
1042 | } |
1043 | ||
1044 | /** | |
1045 | * smack_inode_setxattr - Smack check for setting xattrs | |
1046 | * @dentry: the object | |
1047 | * @name: name of the attribute | |
e95ef49b LP |
1048 | * @value: value of the attribute |
1049 | * @size: size of the value | |
e114e473 CS |
1050 | * @flags: unused |
1051 | * | |
1052 | * This protects the Smack attribute explicitly. | |
1053 | * | |
1054 | * Returns 0 if access is permitted, an error code otherwise | |
1055 | */ | |
8f0cfa52 DH |
1056 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1057 | const void *value, size_t size, int flags) | |
e114e473 | 1058 | { |
ecfcc53f | 1059 | struct smk_audit_info ad; |
19760ad0 CS |
1060 | struct smack_known *skp; |
1061 | int check_priv = 0; | |
1062 | int check_import = 0; | |
1063 | int check_star = 0; | |
bcdca225 | 1064 | int rc = 0; |
e114e473 | 1065 | |
19760ad0 CS |
1066 | /* |
1067 | * Check label validity here so import won't fail in post_setxattr | |
1068 | */ | |
bcdca225 CS |
1069 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1070 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1071 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1072 | check_priv = 1; | |
1073 | check_import = 1; | |
1074 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1075 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1076 | check_priv = 1; | |
1077 | check_import = 1; | |
1078 | check_star = 1; | |
5c6d1125 | 1079 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1080 | check_priv = 1; |
5c6d1125 JS |
1081 | if (size != TRANS_TRUE_SIZE || |
1082 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1083 | rc = -EINVAL; | |
bcdca225 CS |
1084 | } else |
1085 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1086 | ||
19760ad0 CS |
1087 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1088 | rc = -EPERM; | |
1089 | ||
1090 | if (rc == 0 && check_import) { | |
b862e561 | 1091 | skp = size ? smk_import_entry(value, size) : NULL; |
19760ad0 CS |
1092 | if (skp == NULL || (check_star && |
1093 | (skp == &smack_known_star || skp == &smack_known_web))) | |
1094 | rc = -EINVAL; | |
1095 | } | |
1096 | ||
a269434d | 1097 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1098 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1099 | ||
d166c802 | 1100 | if (rc == 0) { |
ecfcc53f | 1101 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 CS |
1102 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
1103 | } | |
bcdca225 CS |
1104 | |
1105 | return rc; | |
e114e473 CS |
1106 | } |
1107 | ||
1108 | /** | |
1109 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1110 | * @dentry: object | |
1111 | * @name: attribute name | |
1112 | * @value: attribute value | |
1113 | * @size: attribute size | |
1114 | * @flags: unused | |
1115 | * | |
1116 | * Set the pointer in the inode blob to the entry found | |
1117 | * in the master label list. | |
1118 | */ | |
8f0cfa52 DH |
1119 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1120 | const void *value, size_t size, int flags) | |
e114e473 | 1121 | { |
2f823ff8 | 1122 | struct smack_known *skp; |
5c6d1125 | 1123 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b | 1124 | |
2f823ff8 CS |
1125 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1126 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1127 | return; | |
1128 | } | |
1129 | ||
676dac4b | 1130 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1131 | skp = smk_import_entry(value, size); |
2f823ff8 | 1132 | if (skp != NULL) |
21c7eae2 | 1133 | isp->smk_inode = skp; |
676dac4b | 1134 | else |
21c7eae2 | 1135 | isp->smk_inode = &smack_known_invalid; |
5c6d1125 | 1136 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1137 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
1138 | if (skp != NULL) |
1139 | isp->smk_task = skp; | |
676dac4b | 1140 | else |
2f823ff8 | 1141 | isp->smk_task = &smack_known_invalid; |
7898e1f8 | 1142 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1143 | skp = smk_import_entry(value, size); |
2f823ff8 CS |
1144 | if (skp != NULL) |
1145 | isp->smk_mmap = skp; | |
7898e1f8 | 1146 | else |
2f823ff8 CS |
1147 | isp->smk_mmap = &smack_known_invalid; |
1148 | } | |
e114e473 CS |
1149 | |
1150 | return; | |
1151 | } | |
1152 | ||
ce8a4321 | 1153 | /** |
e114e473 CS |
1154 | * smack_inode_getxattr - Smack check on getxattr |
1155 | * @dentry: the object | |
1156 | * @name: unused | |
1157 | * | |
1158 | * Returns 0 if access is permitted, an error code otherwise | |
1159 | */ | |
8f0cfa52 | 1160 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1161 | { |
ecfcc53f | 1162 | struct smk_audit_info ad; |
d166c802 | 1163 | int rc; |
ecfcc53f | 1164 | |
a269434d | 1165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1166 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1167 | ||
d166c802 CS |
1168 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
1169 | rc = smk_bu_inode(dentry->d_inode, MAY_READ, rc); | |
1170 | return rc; | |
e114e473 CS |
1171 | } |
1172 | ||
ce8a4321 | 1173 | /** |
e114e473 CS |
1174 | * smack_inode_removexattr - Smack check on removexattr |
1175 | * @dentry: the object | |
1176 | * @name: name of the attribute | |
1177 | * | |
1178 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1179 | * | |
1180 | * Returns 0 if access is permitted, an error code otherwise | |
1181 | */ | |
8f0cfa52 | 1182 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1183 | { |
676dac4b | 1184 | struct inode_smack *isp; |
ecfcc53f | 1185 | struct smk_audit_info ad; |
bcdca225 | 1186 | int rc = 0; |
e114e473 | 1187 | |
bcdca225 CS |
1188 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1189 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1190 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1191 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1192 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1193 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1194 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1195 | rc = -EPERM; |
1196 | } else | |
1197 | rc = cap_inode_removexattr(dentry, name); | |
1198 | ||
f59bdfba CS |
1199 | if (rc != 0) |
1200 | return rc; | |
1201 | ||
a269434d | 1202 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1203 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1204 | |
f59bdfba | 1205 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
d166c802 | 1206 | rc = smk_bu_inode(dentry->d_inode, MAY_WRITE, rc); |
f59bdfba CS |
1207 | if (rc != 0) |
1208 | return rc; | |
1209 | ||
1210 | isp = dentry->d_inode->i_security; | |
1211 | /* | |
1212 | * Don't do anything special for these. | |
1213 | * XATTR_NAME_SMACKIPIN | |
1214 | * XATTR_NAME_SMACKIPOUT | |
1215 | * XATTR_NAME_SMACKEXEC | |
1216 | */ | |
1217 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
676dac4b | 1218 | isp->smk_task = NULL; |
f59bdfba | 1219 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1220 | isp->smk_mmap = NULL; |
f59bdfba CS |
1221 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1222 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1223 | |
f59bdfba | 1224 | return 0; |
e114e473 CS |
1225 | } |
1226 | ||
1227 | /** | |
1228 | * smack_inode_getsecurity - get smack xattrs | |
1229 | * @inode: the object | |
1230 | * @name: attribute name | |
1231 | * @buffer: where to put the result | |
251a2a95 | 1232 | * @alloc: unused |
e114e473 CS |
1233 | * |
1234 | * Returns the size of the attribute or an error code | |
1235 | */ | |
1236 | static int smack_inode_getsecurity(const struct inode *inode, | |
1237 | const char *name, void **buffer, | |
1238 | bool alloc) | |
1239 | { | |
1240 | struct socket_smack *ssp; | |
1241 | struct socket *sock; | |
1242 | struct super_block *sbp; | |
1243 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1244 | struct smack_known *isp; |
e114e473 CS |
1245 | int ilen; |
1246 | int rc = 0; | |
1247 | ||
1248 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1249 | isp = smk_of_inode(inode); | |
21c7eae2 LP |
1250 | ilen = strlen(isp->smk_known); |
1251 | *buffer = isp->smk_known; | |
e114e473 CS |
1252 | return ilen; |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * The rest of the Smack xattrs are only on sockets. | |
1257 | */ | |
1258 | sbp = ip->i_sb; | |
1259 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1260 | return -EOPNOTSUPP; | |
1261 | ||
1262 | sock = SOCKET_I(ip); | |
2e1d146a | 1263 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1264 | return -EOPNOTSUPP; |
1265 | ||
1266 | ssp = sock->sk->sk_security; | |
1267 | ||
1268 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
21c7eae2 | 1269 | isp = ssp->smk_in; |
e114e473 | 1270 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) |
21c7eae2 | 1271 | isp = ssp->smk_out; |
e114e473 CS |
1272 | else |
1273 | return -EOPNOTSUPP; | |
1274 | ||
21c7eae2 | 1275 | ilen = strlen(isp->smk_known); |
e114e473 | 1276 | if (rc == 0) { |
21c7eae2 | 1277 | *buffer = isp->smk_known; |
e114e473 CS |
1278 | rc = ilen; |
1279 | } | |
1280 | ||
1281 | return rc; | |
1282 | } | |
1283 | ||
1284 | ||
1285 | /** | |
1286 | * smack_inode_listsecurity - list the Smack attributes | |
1287 | * @inode: the object | |
1288 | * @buffer: where they go | |
1289 | * @buffer_size: size of buffer | |
1290 | * | |
1291 | * Returns 0 on success, -EINVAL otherwise | |
1292 | */ | |
1293 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1294 | size_t buffer_size) | |
1295 | { | |
fd5c9d23 | 1296 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1297 | |
fd5c9d23 | 1298 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1299 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1300 | |
1301 | return len; | |
e114e473 CS |
1302 | } |
1303 | ||
d20bdda6 AD |
1304 | /** |
1305 | * smack_inode_getsecid - Extract inode's security id | |
1306 | * @inode: inode to extract the info from | |
1307 | * @secid: where result will be saved | |
1308 | */ | |
1309 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1310 | { | |
1311 | struct inode_smack *isp = inode->i_security; | |
1312 | ||
21c7eae2 | 1313 | *secid = isp->smk_inode->smk_secid; |
d20bdda6 AD |
1314 | } |
1315 | ||
e114e473 CS |
1316 | /* |
1317 | * File Hooks | |
1318 | */ | |
1319 | ||
1320 | /** | |
1321 | * smack_file_permission - Smack check on file operations | |
1322 | * @file: unused | |
1323 | * @mask: unused | |
1324 | * | |
1325 | * Returns 0 | |
1326 | * | |
1327 | * Should access checks be done on each read or write? | |
1328 | * UNICOS and SELinux say yes. | |
1329 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1330 | * | |
1331 | * I'll say no for now. Smack does not do the frequent | |
1332 | * label changing that SELinux does. | |
1333 | */ | |
1334 | static int smack_file_permission(struct file *file, int mask) | |
1335 | { | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | /** | |
1340 | * smack_file_alloc_security - assign a file security blob | |
1341 | * @file: the object | |
1342 | * | |
1343 | * The security blob for a file is a pointer to the master | |
1344 | * label list, so no allocation is done. | |
1345 | * | |
1346 | * Returns 0 | |
1347 | */ | |
1348 | static int smack_file_alloc_security(struct file *file) | |
1349 | { | |
2f823ff8 CS |
1350 | struct smack_known *skp = smk_of_current(); |
1351 | ||
21c7eae2 | 1352 | file->f_security = skp; |
e114e473 CS |
1353 | return 0; |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * smack_file_free_security - clear a file security blob | |
1358 | * @file: the object | |
1359 | * | |
1360 | * The security blob for a file is a pointer to the master | |
1361 | * label list, so no memory is freed. | |
1362 | */ | |
1363 | static void smack_file_free_security(struct file *file) | |
1364 | { | |
1365 | file->f_security = NULL; | |
1366 | } | |
1367 | ||
1368 | /** | |
1369 | * smack_file_ioctl - Smack check on ioctls | |
1370 | * @file: the object | |
1371 | * @cmd: what to do | |
1372 | * @arg: unused | |
1373 | * | |
1374 | * Relies heavily on the correct use of the ioctl command conventions. | |
1375 | * | |
1376 | * Returns 0 if allowed, error code otherwise | |
1377 | */ | |
1378 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1379 | unsigned long arg) | |
1380 | { | |
1381 | int rc = 0; | |
ecfcc53f EB |
1382 | struct smk_audit_info ad; |
1383 | ||
f48b7399 | 1384 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1385 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1386 | |
d166c802 | 1387 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
ecfcc53f | 1388 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
d166c802 CS |
1389 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1390 | } | |
e114e473 | 1391 | |
d166c802 | 1392 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
ecfcc53f | 1393 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
d166c802 CS |
1394 | rc = smk_bu_file(file, MAY_READ, rc); |
1395 | } | |
e114e473 CS |
1396 | |
1397 | return rc; | |
1398 | } | |
1399 | ||
1400 | /** | |
1401 | * smack_file_lock - Smack check on file locking | |
1402 | * @file: the object | |
251a2a95 | 1403 | * @cmd: unused |
e114e473 | 1404 | * |
c0ab6e56 | 1405 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1406 | */ |
1407 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1408 | { | |
ecfcc53f | 1409 | struct smk_audit_info ad; |
d166c802 | 1410 | int rc; |
ecfcc53f | 1411 | |
92f42509 EP |
1412 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1413 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
d166c802 CS |
1414 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); |
1415 | rc = smk_bu_file(file, MAY_LOCK, rc); | |
1416 | return rc; | |
e114e473 CS |
1417 | } |
1418 | ||
1419 | /** | |
1420 | * smack_file_fcntl - Smack check on fcntl | |
1421 | * @file: the object | |
1422 | * @cmd: what action to check | |
1423 | * @arg: unused | |
1424 | * | |
531f1d45 CS |
1425 | * Generally these operations are harmless. |
1426 | * File locking operations present an obvious mechanism | |
1427 | * for passing information, so they require write access. | |
1428 | * | |
e114e473 CS |
1429 | * Returns 0 if current has access, error code otherwise |
1430 | */ | |
1431 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1432 | unsigned long arg) | |
1433 | { | |
ecfcc53f | 1434 | struct smk_audit_info ad; |
531f1d45 | 1435 | int rc = 0; |
e114e473 | 1436 | |
ecfcc53f | 1437 | |
e114e473 | 1438 | switch (cmd) { |
e114e473 | 1439 | case F_GETLK: |
c0ab6e56 | 1440 | break; |
e114e473 CS |
1441 | case F_SETLK: |
1442 | case F_SETLKW: | |
c0ab6e56 CS |
1443 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1444 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1445 | rc = smk_curacc(file->f_security, MAY_LOCK, &ad); | |
d166c802 | 1446 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1447 | break; |
e114e473 CS |
1448 | case F_SETOWN: |
1449 | case F_SETSIG: | |
531f1d45 CS |
1450 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1451 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1452 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
d166c802 | 1453 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1454 | break; |
1455 | default: | |
531f1d45 | 1456 | break; |
e114e473 CS |
1457 | } |
1458 | ||
1459 | return rc; | |
1460 | } | |
1461 | ||
7898e1f8 | 1462 | /** |
e5467859 | 1463 | * smack_mmap_file : |
7898e1f8 CS |
1464 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1465 | * if mapping anonymous memory. | |
1466 | * @file contains the file structure for file to map (may be NULL). | |
1467 | * @reqprot contains the protection requested by the application. | |
1468 | * @prot contains the protection that will be applied by the kernel. | |
1469 | * @flags contains the operational flags. | |
1470 | * Return 0 if permission is granted. | |
1471 | */ | |
e5467859 | 1472 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1473 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1474 | unsigned long flags) |
7898e1f8 | 1475 | { |
272cd7a8 | 1476 | struct smack_known *skp; |
2f823ff8 | 1477 | struct smack_known *mkp; |
7898e1f8 CS |
1478 | struct smack_rule *srp; |
1479 | struct task_smack *tsp; | |
21c7eae2 | 1480 | struct smack_known *okp; |
7898e1f8 | 1481 | struct inode_smack *isp; |
0e0a070d CS |
1482 | int may; |
1483 | int mmay; | |
1484 | int tmay; | |
7898e1f8 CS |
1485 | int rc; |
1486 | ||
496ad9aa | 1487 | if (file == NULL) |
7898e1f8 CS |
1488 | return 0; |
1489 | ||
496ad9aa | 1490 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1491 | if (isp->smk_mmap == NULL) |
1492 | return 0; | |
2f823ff8 | 1493 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1494 | |
1495 | tsp = current_security(); | |
2f823ff8 | 1496 | skp = smk_of_current(); |
7898e1f8 CS |
1497 | rc = 0; |
1498 | ||
1499 | rcu_read_lock(); | |
1500 | /* | |
1501 | * For each Smack rule associated with the subject | |
1502 | * label verify that the SMACK64MMAP also has access | |
1503 | * to that rule's object label. | |
7898e1f8 | 1504 | */ |
272cd7a8 | 1505 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1506 | okp = srp->smk_object; |
7898e1f8 CS |
1507 | /* |
1508 | * Matching labels always allows access. | |
1509 | */ | |
21c7eae2 | 1510 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1511 | continue; |
0e0a070d CS |
1512 | /* |
1513 | * If there is a matching local rule take | |
1514 | * that into account as well. | |
1515 | */ | |
21c7eae2 LP |
1516 | may = smk_access_entry(srp->smk_subject->smk_known, |
1517 | okp->smk_known, | |
1518 | &tsp->smk_rules); | |
0e0a070d CS |
1519 | if (may == -ENOENT) |
1520 | may = srp->smk_access; | |
1521 | else | |
1522 | may &= srp->smk_access; | |
1523 | /* | |
1524 | * If may is zero the SMACK64MMAP subject can't | |
1525 | * possibly have less access. | |
1526 | */ | |
1527 | if (may == 0) | |
1528 | continue; | |
1529 | ||
1530 | /* | |
1531 | * Fetch the global list entry. | |
1532 | * If there isn't one a SMACK64MMAP subject | |
1533 | * can't have as much access as current. | |
1534 | */ | |
21c7eae2 LP |
1535 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1536 | &mkp->smk_rules); | |
0e0a070d CS |
1537 | if (mmay == -ENOENT) { |
1538 | rc = -EACCES; | |
1539 | break; | |
1540 | } | |
1541 | /* | |
1542 | * If there is a local entry it modifies the | |
1543 | * potential access, too. | |
1544 | */ | |
21c7eae2 LP |
1545 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1546 | &tsp->smk_rules); | |
0e0a070d CS |
1547 | if (tmay != -ENOENT) |
1548 | mmay &= tmay; | |
7898e1f8 | 1549 | |
0e0a070d CS |
1550 | /* |
1551 | * If there is any access available to current that is | |
1552 | * not available to a SMACK64MMAP subject | |
1553 | * deny access. | |
1554 | */ | |
75a25637 | 1555 | if ((may | mmay) != mmay) { |
0e0a070d | 1556 | rc = -EACCES; |
7898e1f8 | 1557 | break; |
0e0a070d | 1558 | } |
7898e1f8 CS |
1559 | } |
1560 | ||
1561 | rcu_read_unlock(); | |
1562 | ||
1563 | return rc; | |
1564 | } | |
1565 | ||
e114e473 CS |
1566 | /** |
1567 | * smack_file_set_fowner - set the file security blob value | |
1568 | * @file: object in question | |
1569 | * | |
1570 | * Returns 0 | |
1571 | * Further research may be required on this one. | |
1572 | */ | |
e0b93edd | 1573 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1574 | { |
2f823ff8 CS |
1575 | struct smack_known *skp = smk_of_current(); |
1576 | ||
21c7eae2 | 1577 | file->f_security = skp; |
e114e473 CS |
1578 | } |
1579 | ||
1580 | /** | |
1581 | * smack_file_send_sigiotask - Smack on sigio | |
1582 | * @tsk: The target task | |
1583 | * @fown: the object the signal come from | |
1584 | * @signum: unused | |
1585 | * | |
1586 | * Allow a privileged task to get signals even if it shouldn't | |
1587 | * | |
1588 | * Returns 0 if a subject with the object's smack could | |
1589 | * write to the task, an error code otherwise. | |
1590 | */ | |
1591 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1592 | struct fown_struct *fown, int signum) | |
1593 | { | |
2f823ff8 CS |
1594 | struct smack_known *skp; |
1595 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
e114e473 CS |
1596 | struct file *file; |
1597 | int rc; | |
ecfcc53f | 1598 | struct smk_audit_info ad; |
e114e473 CS |
1599 | |
1600 | /* | |
1601 | * struct fown_struct is never outside the context of a struct file | |
1602 | */ | |
1603 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1604 | |
ecfcc53f | 1605 | /* we don't log here as rc can be overriden */ |
21c7eae2 LP |
1606 | skp = file->f_security; |
1607 | rc = smk_access(skp, tkp, MAY_WRITE, NULL); | |
1608 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_WRITE, rc); | |
5cd9c58f | 1609 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1610 | rc = 0; |
1611 | ||
1612 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1613 | smk_ad_setfield_u_tsk(&ad, tsk); | |
21c7eae2 | 1614 | smack_log(skp->smk_known, tkp->smk_known, MAY_WRITE, rc, &ad); |
e114e473 CS |
1615 | return rc; |
1616 | } | |
1617 | ||
1618 | /** | |
1619 | * smack_file_receive - Smack file receive check | |
1620 | * @file: the object | |
1621 | * | |
1622 | * Returns 0 if current has access, error code otherwise | |
1623 | */ | |
1624 | static int smack_file_receive(struct file *file) | |
1625 | { | |
d166c802 | 1626 | int rc; |
e114e473 | 1627 | int may = 0; |
ecfcc53f | 1628 | struct smk_audit_info ad; |
e114e473 | 1629 | |
4482a44f | 1630 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1631 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1632 | /* |
1633 | * This code relies on bitmasks. | |
1634 | */ | |
1635 | if (file->f_mode & FMODE_READ) | |
1636 | may = MAY_READ; | |
1637 | if (file->f_mode & FMODE_WRITE) | |
1638 | may |= MAY_WRITE; | |
1639 | ||
d166c802 CS |
1640 | rc = smk_curacc(file->f_security, may, &ad); |
1641 | rc = smk_bu_file(file, may, rc); | |
1642 | return rc; | |
e114e473 CS |
1643 | } |
1644 | ||
531f1d45 | 1645 | /** |
83d49856 | 1646 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1647 | * @file: the object |
a6834c0b | 1648 | * @cred: task credential |
531f1d45 CS |
1649 | * |
1650 | * Set the security blob in the file structure. | |
a6834c0b CS |
1651 | * Allow the open only if the task has read access. There are |
1652 | * many read operations (e.g. fstat) that you can do with an | |
1653 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1654 | * |
1655 | * Returns 0 | |
1656 | */ | |
83d49856 | 1657 | static int smack_file_open(struct file *file, const struct cred *cred) |
531f1d45 | 1658 | { |
a6834c0b | 1659 | struct task_smack *tsp = cred->security; |
496ad9aa | 1660 | struct inode_smack *isp = file_inode(file)->i_security; |
a6834c0b CS |
1661 | struct smk_audit_info ad; |
1662 | int rc; | |
531f1d45 | 1663 | |
d83d2c26 MN |
1664 | if (smack_privileged(CAP_MAC_OVERRIDE)) { |
1665 | file->f_security = isp->smk_inode; | |
a6834c0b | 1666 | return 0; |
d83d2c26 | 1667 | } |
531f1d45 | 1668 | |
a6834c0b CS |
1669 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1670 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1671 | rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad); | |
d166c802 | 1672 | rc = smk_bu_credfile(cred, file, MAY_READ, rc); |
a6834c0b CS |
1673 | if (rc == 0) |
1674 | file->f_security = isp->smk_inode; | |
1675 | ||
1676 | return rc; | |
531f1d45 CS |
1677 | } |
1678 | ||
e114e473 CS |
1679 | /* |
1680 | * Task hooks | |
1681 | */ | |
1682 | ||
ee18d64c DH |
1683 | /** |
1684 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1685 | * @new: the new credentials | |
1686 | * @gfp: the atomicity of any memory allocations | |
1687 | * | |
1688 | * Prepare a blank set of credentials for modification. This must allocate all | |
1689 | * the memory the LSM module might require such that cred_transfer() can | |
1690 | * complete without error. | |
1691 | */ | |
1692 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1693 | { | |
7898e1f8 CS |
1694 | struct task_smack *tsp; |
1695 | ||
1696 | tsp = new_task_smack(NULL, NULL, gfp); | |
1697 | if (tsp == NULL) | |
676dac4b | 1698 | return -ENOMEM; |
7898e1f8 CS |
1699 | |
1700 | cred->security = tsp; | |
1701 | ||
ee18d64c DH |
1702 | return 0; |
1703 | } | |
1704 | ||
1705 | ||
e114e473 | 1706 | /** |
f1752eec DH |
1707 | * smack_cred_free - "free" task-level security credentials |
1708 | * @cred: the credentials in question | |
e114e473 | 1709 | * |
e114e473 | 1710 | */ |
f1752eec | 1711 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1712 | { |
7898e1f8 CS |
1713 | struct task_smack *tsp = cred->security; |
1714 | struct smack_rule *rp; | |
1715 | struct list_head *l; | |
1716 | struct list_head *n; | |
1717 | ||
1718 | if (tsp == NULL) | |
1719 | return; | |
1720 | cred->security = NULL; | |
1721 | ||
1722 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1723 | rp = list_entry(l, struct smack_rule, list); | |
1724 | list_del(&rp->list); | |
1725 | kfree(rp); | |
1726 | } | |
1727 | kfree(tsp); | |
e114e473 CS |
1728 | } |
1729 | ||
d84f4f99 DH |
1730 | /** |
1731 | * smack_cred_prepare - prepare new set of credentials for modification | |
1732 | * @new: the new credentials | |
1733 | * @old: the original credentials | |
1734 | * @gfp: the atomicity of any memory allocations | |
1735 | * | |
1736 | * Prepare a new set of credentials for modification. | |
1737 | */ | |
1738 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1739 | gfp_t gfp) | |
1740 | { | |
676dac4b CS |
1741 | struct task_smack *old_tsp = old->security; |
1742 | struct task_smack *new_tsp; | |
7898e1f8 | 1743 | int rc; |
676dac4b | 1744 | |
7898e1f8 | 1745 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1746 | if (new_tsp == NULL) |
1747 | return -ENOMEM; | |
1748 | ||
7898e1f8 CS |
1749 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1750 | if (rc != 0) | |
1751 | return rc; | |
1752 | ||
676dac4b | 1753 | new->security = new_tsp; |
d84f4f99 DH |
1754 | return 0; |
1755 | } | |
1756 | ||
ee18d64c DH |
1757 | /** |
1758 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1759 | * @new: the new credentials | |
1760 | * @old: the original credentials | |
1761 | * | |
1762 | * Fill in a set of blank credentials from another set of credentials. | |
1763 | */ | |
1764 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1765 | { | |
676dac4b CS |
1766 | struct task_smack *old_tsp = old->security; |
1767 | struct task_smack *new_tsp = new->security; | |
1768 | ||
1769 | new_tsp->smk_task = old_tsp->smk_task; | |
1770 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1771 | mutex_init(&new_tsp->smk_rules_lock); |
1772 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1773 | ||
1774 | ||
1775 | /* cbs copy rule list */ | |
ee18d64c DH |
1776 | } |
1777 | ||
3a3b7ce9 DH |
1778 | /** |
1779 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1780 | * @new: points to the set of credentials to be modified. |
1781 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1782 | * |
1783 | * Set the security data for a kernel service. | |
1784 | */ | |
1785 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1786 | { | |
676dac4b | 1787 | struct task_smack *new_tsp = new->security; |
2f823ff8 | 1788 | struct smack_known *skp = smack_from_secid(secid); |
3a3b7ce9 | 1789 | |
2f823ff8 | 1790 | if (skp == NULL) |
3a3b7ce9 DH |
1791 | return -EINVAL; |
1792 | ||
2f823ff8 | 1793 | new_tsp->smk_task = skp; |
3a3b7ce9 DH |
1794 | return 0; |
1795 | } | |
1796 | ||
1797 | /** | |
1798 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1799 | * @new: points to the set of credentials to be modified |
1800 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1801 | * |
1802 | * Set the file creation context in a set of credentials to the same | |
1803 | * as the objective context of the specified inode | |
1804 | */ | |
1805 | static int smack_kernel_create_files_as(struct cred *new, | |
1806 | struct inode *inode) | |
1807 | { | |
1808 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1809 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1810 | |
21c7eae2 | 1811 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 1812 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
1813 | return 0; |
1814 | } | |
1815 | ||
ecfcc53f EB |
1816 | /** |
1817 | * smk_curacc_on_task - helper to log task related access | |
1818 | * @p: the task object | |
531f1d45 CS |
1819 | * @access: the access requested |
1820 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1821 | * |
1822 | * Return 0 if access is permitted | |
1823 | */ | |
531f1d45 CS |
1824 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1825 | const char *caller) | |
ecfcc53f EB |
1826 | { |
1827 | struct smk_audit_info ad; | |
2f823ff8 | 1828 | struct smack_known *skp = smk_of_task(task_security(p)); |
d166c802 | 1829 | int rc; |
ecfcc53f | 1830 | |
531f1d45 | 1831 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1832 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 1833 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
1834 | rc = smk_bu_task(p, access, rc); |
1835 | return rc; | |
ecfcc53f EB |
1836 | } |
1837 | ||
e114e473 CS |
1838 | /** |
1839 | * smack_task_setpgid - Smack check on setting pgid | |
1840 | * @p: the task object | |
1841 | * @pgid: unused | |
1842 | * | |
1843 | * Return 0 if write access is permitted | |
1844 | */ | |
1845 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1846 | { | |
531f1d45 | 1847 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1848 | } |
1849 | ||
1850 | /** | |
1851 | * smack_task_getpgid - Smack access check for getpgid | |
1852 | * @p: the object task | |
1853 | * | |
1854 | * Returns 0 if current can read the object task, error code otherwise | |
1855 | */ | |
1856 | static int smack_task_getpgid(struct task_struct *p) | |
1857 | { | |
531f1d45 | 1858 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1859 | } |
1860 | ||
1861 | /** | |
1862 | * smack_task_getsid - Smack access check for getsid | |
1863 | * @p: the object task | |
1864 | * | |
1865 | * Returns 0 if current can read the object task, error code otherwise | |
1866 | */ | |
1867 | static int smack_task_getsid(struct task_struct *p) | |
1868 | { | |
531f1d45 | 1869 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1870 | } |
1871 | ||
1872 | /** | |
1873 | * smack_task_getsecid - get the secid of the task | |
1874 | * @p: the object task | |
1875 | * @secid: where to put the result | |
1876 | * | |
1877 | * Sets the secid to contain a u32 version of the smack label. | |
1878 | */ | |
1879 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1880 | { | |
2f823ff8 CS |
1881 | struct smack_known *skp = smk_of_task(task_security(p)); |
1882 | ||
1883 | *secid = skp->smk_secid; | |
e114e473 CS |
1884 | } |
1885 | ||
1886 | /** | |
1887 | * smack_task_setnice - Smack check on setting nice | |
1888 | * @p: the task object | |
1889 | * @nice: unused | |
1890 | * | |
1891 | * Return 0 if write access is permitted | |
1892 | */ | |
1893 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1894 | { | |
bcdca225 CS |
1895 | int rc; |
1896 | ||
1897 | rc = cap_task_setnice(p, nice); | |
1898 | if (rc == 0) | |
531f1d45 | 1899 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1900 | return rc; |
e114e473 CS |
1901 | } |
1902 | ||
1903 | /** | |
1904 | * smack_task_setioprio - Smack check on setting ioprio | |
1905 | * @p: the task object | |
1906 | * @ioprio: unused | |
1907 | * | |
1908 | * Return 0 if write access is permitted | |
1909 | */ | |
1910 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1911 | { | |
bcdca225 CS |
1912 | int rc; |
1913 | ||
1914 | rc = cap_task_setioprio(p, ioprio); | |
1915 | if (rc == 0) | |
531f1d45 | 1916 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1917 | return rc; |
e114e473 CS |
1918 | } |
1919 | ||
1920 | /** | |
1921 | * smack_task_getioprio - Smack check on reading ioprio | |
1922 | * @p: the task object | |
1923 | * | |
1924 | * Return 0 if read access is permitted | |
1925 | */ | |
1926 | static int smack_task_getioprio(struct task_struct *p) | |
1927 | { | |
531f1d45 | 1928 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1929 | } |
1930 | ||
1931 | /** | |
1932 | * smack_task_setscheduler - Smack check on setting scheduler | |
1933 | * @p: the task object | |
1934 | * @policy: unused | |
1935 | * @lp: unused | |
1936 | * | |
1937 | * Return 0 if read access is permitted | |
1938 | */ | |
b0ae1981 | 1939 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1940 | { |
bcdca225 CS |
1941 | int rc; |
1942 | ||
b0ae1981 | 1943 | rc = cap_task_setscheduler(p); |
bcdca225 | 1944 | if (rc == 0) |
531f1d45 | 1945 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1946 | return rc; |
e114e473 CS |
1947 | } |
1948 | ||
1949 | /** | |
1950 | * smack_task_getscheduler - Smack check on reading scheduler | |
1951 | * @p: the task object | |
1952 | * | |
1953 | * Return 0 if read access is permitted | |
1954 | */ | |
1955 | static int smack_task_getscheduler(struct task_struct *p) | |
1956 | { | |
531f1d45 | 1957 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1958 | } |
1959 | ||
1960 | /** | |
1961 | * smack_task_movememory - Smack check on moving memory | |
1962 | * @p: the task object | |
1963 | * | |
1964 | * Return 0 if write access is permitted | |
1965 | */ | |
1966 | static int smack_task_movememory(struct task_struct *p) | |
1967 | { | |
531f1d45 | 1968 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1969 | } |
1970 | ||
1971 | /** | |
1972 | * smack_task_kill - Smack check on signal delivery | |
1973 | * @p: the task object | |
1974 | * @info: unused | |
1975 | * @sig: unused | |
1976 | * @secid: identifies the smack to use in lieu of current's | |
1977 | * | |
1978 | * Return 0 if write access is permitted | |
1979 | * | |
1980 | * The secid behavior is an artifact of an SELinux hack | |
1981 | * in the USB code. Someday it may go away. | |
1982 | */ | |
1983 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1984 | int sig, u32 secid) | |
1985 | { | |
ecfcc53f | 1986 | struct smk_audit_info ad; |
2f823ff8 CS |
1987 | struct smack_known *skp; |
1988 | struct smack_known *tkp = smk_of_task(task_security(p)); | |
d166c802 | 1989 | int rc; |
ecfcc53f EB |
1990 | |
1991 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1992 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1993 | /* |
1994 | * Sending a signal requires that the sender | |
1995 | * can write the receiver. | |
1996 | */ | |
d166c802 | 1997 | if (secid == 0) { |
21c7eae2 | 1998 | rc = smk_curacc(tkp, MAY_WRITE, &ad); |
d166c802 CS |
1999 | rc = smk_bu_task(p, MAY_WRITE, rc); |
2000 | return rc; | |
2001 | } | |
e114e473 CS |
2002 | /* |
2003 | * If the secid isn't 0 we're dealing with some USB IO | |
2004 | * specific behavior. This is not clean. For one thing | |
2005 | * we can't take privilege into account. | |
2006 | */ | |
2f823ff8 | 2007 | skp = smack_from_secid(secid); |
21c7eae2 LP |
2008 | rc = smk_access(skp, tkp, MAY_WRITE, &ad); |
2009 | rc = smk_bu_note("USB signal", skp, tkp, MAY_WRITE, rc); | |
d166c802 | 2010 | return rc; |
e114e473 CS |
2011 | } |
2012 | ||
2013 | /** | |
2014 | * smack_task_wait - Smack access check for waiting | |
2015 | * @p: task to wait for | |
2016 | * | |
c00bedb3 | 2017 | * Returns 0 |
e114e473 CS |
2018 | */ |
2019 | static int smack_task_wait(struct task_struct *p) | |
2020 | { | |
e114e473 | 2021 | /* |
c00bedb3 CS |
2022 | * Allow the operation to succeed. |
2023 | * Zombies are bad. | |
2024 | * In userless environments (e.g. phones) programs | |
2025 | * get marked with SMACK64EXEC and even if the parent | |
2026 | * and child shouldn't be talking the parent still | |
2027 | * may expect to know when the child exits. | |
e114e473 | 2028 | */ |
c00bedb3 | 2029 | return 0; |
e114e473 CS |
2030 | } |
2031 | ||
2032 | /** | |
2033 | * smack_task_to_inode - copy task smack into the inode blob | |
2034 | * @p: task to copy from | |
251a2a95 | 2035 | * @inode: inode to copy to |
e114e473 CS |
2036 | * |
2037 | * Sets the smack pointer in the inode security blob | |
2038 | */ | |
2039 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2040 | { | |
2041 | struct inode_smack *isp = inode->i_security; | |
2f823ff8 CS |
2042 | struct smack_known *skp = smk_of_task(task_security(p)); |
2043 | ||
21c7eae2 | 2044 | isp->smk_inode = skp; |
e114e473 CS |
2045 | } |
2046 | ||
2047 | /* | |
2048 | * Socket hooks. | |
2049 | */ | |
2050 | ||
2051 | /** | |
2052 | * smack_sk_alloc_security - Allocate a socket blob | |
2053 | * @sk: the socket | |
2054 | * @family: unused | |
251a2a95 | 2055 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2056 | * |
2057 | * Assign Smack pointers to current | |
2058 | * | |
2059 | * Returns 0 on success, -ENOMEM is there's no memory | |
2060 | */ | |
2061 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2062 | { | |
2f823ff8 | 2063 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2064 | struct socket_smack *ssp; |
2065 | ||
2066 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2067 | if (ssp == NULL) | |
2068 | return -ENOMEM; | |
2069 | ||
54e70ec5 | 2070 | ssp->smk_in = skp; |
2f823ff8 | 2071 | ssp->smk_out = skp; |
272cd7a8 | 2072 | ssp->smk_packet = NULL; |
e114e473 CS |
2073 | |
2074 | sk->sk_security = ssp; | |
2075 | ||
2076 | return 0; | |
2077 | } | |
2078 | ||
2079 | /** | |
2080 | * smack_sk_free_security - Free a socket blob | |
2081 | * @sk: the socket | |
2082 | * | |
2083 | * Clears the blob pointer | |
2084 | */ | |
2085 | static void smack_sk_free_security(struct sock *sk) | |
2086 | { | |
2087 | kfree(sk->sk_security); | |
2088 | } | |
2089 | ||
07feee8f PM |
2090 | /** |
2091 | * smack_host_label - check host based restrictions | |
2092 | * @sip: the object end | |
2093 | * | |
2094 | * looks for host based access restrictions | |
2095 | * | |
2096 | * This version will only be appropriate for really small sets of single label | |
2097 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2098 | * taken before calling this function. | |
2099 | * | |
2100 | * Returns the label of the far end or NULL if it's not special. | |
2101 | */ | |
21c7eae2 | 2102 | static struct smack_known *smack_host_label(struct sockaddr_in *sip) |
07feee8f PM |
2103 | { |
2104 | struct smk_netlbladdr *snp; | |
2105 | struct in_addr *siap = &sip->sin_addr; | |
2106 | ||
2107 | if (siap->s_addr == 0) | |
2108 | return NULL; | |
2109 | ||
2110 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
2111 | /* | |
2112 | * we break after finding the first match because | |
2113 | * the list is sorted from longest to shortest mask | |
2114 | * so we have found the most specific match | |
2115 | */ | |
2116 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
2117 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
2118 | /* we have found the special CIPSO option */ | |
21c7eae2 | 2119 | if (snp->smk_label == &smack_cipso_option) |
4303154e | 2120 | return NULL; |
07feee8f | 2121 | return snp->smk_label; |
4303154e | 2122 | } |
07feee8f PM |
2123 | |
2124 | return NULL; | |
2125 | } | |
2126 | ||
e114e473 CS |
2127 | /** |
2128 | * smack_netlabel - Set the secattr on a socket | |
2129 | * @sk: the socket | |
6d3dc07c | 2130 | * @labeled: socket label scheme |
e114e473 CS |
2131 | * |
2132 | * Convert the outbound smack value (smk_out) to a | |
2133 | * secattr and attach it to the socket. | |
2134 | * | |
2135 | * Returns 0 on success or an error code | |
2136 | */ | |
6d3dc07c | 2137 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2138 | { |
f7112e6c | 2139 | struct smack_known *skp; |
07feee8f | 2140 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2141 | int rc = 0; |
e114e473 | 2142 | |
6d3dc07c CS |
2143 | /* |
2144 | * Usually the netlabel code will handle changing the | |
2145 | * packet labeling based on the label. | |
2146 | * The case of a single label host is different, because | |
2147 | * a single label host should never get a labeled packet | |
2148 | * even though the label is usually associated with a packet | |
2149 | * label. | |
2150 | */ | |
2151 | local_bh_disable(); | |
2152 | bh_lock_sock_nested(sk); | |
2153 | ||
2154 | if (ssp->smk_out == smack_net_ambient || | |
2155 | labeled == SMACK_UNLABELED_SOCKET) | |
2156 | netlbl_sock_delattr(sk); | |
2157 | else { | |
2f823ff8 | 2158 | skp = ssp->smk_out; |
f7112e6c | 2159 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2160 | } |
2161 | ||
2162 | bh_unlock_sock(sk); | |
2163 | local_bh_enable(); | |
4bc87e62 | 2164 | |
e114e473 CS |
2165 | return rc; |
2166 | } | |
2167 | ||
07feee8f PM |
2168 | /** |
2169 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2170 | * @sk: the socket | |
2171 | * @sap: the destination address | |
2172 | * | |
2173 | * Set the correct secattr for the given socket based on the destination | |
2174 | * address and perform any outbound access checks needed. | |
2175 | * | |
2176 | * Returns 0 on success or an error code. | |
2177 | * | |
2178 | */ | |
2179 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2180 | { | |
2f823ff8 | 2181 | struct smack_known *skp; |
07feee8f PM |
2182 | int rc; |
2183 | int sk_lbl; | |
21c7eae2 | 2184 | struct smack_known *hkp; |
07feee8f | 2185 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2186 | struct smk_audit_info ad; |
07feee8f PM |
2187 | |
2188 | rcu_read_lock(); | |
21c7eae2 LP |
2189 | hkp = smack_host_label(sap); |
2190 | if (hkp != NULL) { | |
ecfcc53f | 2191 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2192 | struct lsm_network_audit net; |
2193 | ||
48c62af6 EP |
2194 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2195 | ad.a.u.net->family = sap->sin_family; | |
2196 | ad.a.u.net->dport = sap->sin_port; | |
2197 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2198 | #endif |
923e9a13 | 2199 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2200 | skp = ssp->smk_out; |
21c7eae2 LP |
2201 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2202 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2203 | } else { |
2204 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2205 | rc = 0; | |
2206 | } | |
2207 | rcu_read_unlock(); | |
2208 | if (rc != 0) | |
2209 | return rc; | |
2210 | ||
2211 | return smack_netlabel(sk, sk_lbl); | |
2212 | } | |
2213 | ||
c6739443 CS |
2214 | /** |
2215 | * smk_ipv6_port_label - Smack port access table management | |
2216 | * @sock: socket | |
2217 | * @address: address | |
2218 | * | |
2219 | * Create or update the port list entry | |
2220 | */ | |
2221 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2222 | { | |
2223 | struct sock *sk = sock->sk; | |
2224 | struct sockaddr_in6 *addr6; | |
2225 | struct socket_smack *ssp = sock->sk->sk_security; | |
2226 | struct smk_port_label *spp; | |
2227 | unsigned short port = 0; | |
2228 | ||
2229 | if (address == NULL) { | |
2230 | /* | |
2231 | * This operation is changing the Smack information | |
2232 | * on the bound socket. Take the changes to the port | |
2233 | * as well. | |
2234 | */ | |
2235 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2236 | if (sk != spp->smk_sock) | |
2237 | continue; | |
2238 | spp->smk_in = ssp->smk_in; | |
2239 | spp->smk_out = ssp->smk_out; | |
2240 | return; | |
2241 | } | |
2242 | /* | |
2243 | * A NULL address is only used for updating existing | |
2244 | * bound entries. If there isn't one, it's OK. | |
2245 | */ | |
2246 | return; | |
2247 | } | |
2248 | ||
2249 | addr6 = (struct sockaddr_in6 *)address; | |
2250 | port = ntohs(addr6->sin6_port); | |
2251 | /* | |
2252 | * This is a special case that is safely ignored. | |
2253 | */ | |
2254 | if (port == 0) | |
2255 | return; | |
2256 | ||
2257 | /* | |
2258 | * Look for an existing port list entry. | |
2259 | * This is an indication that a port is getting reused. | |
2260 | */ | |
2261 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2262 | if (spp->smk_port != port) | |
2263 | continue; | |
2264 | spp->smk_port = port; | |
2265 | spp->smk_sock = sk; | |
2266 | spp->smk_in = ssp->smk_in; | |
2267 | spp->smk_out = ssp->smk_out; | |
2268 | return; | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * A new port entry is required. | |
2273 | */ | |
2274 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2275 | if (spp == NULL) | |
2276 | return; | |
2277 | ||
2278 | spp->smk_port = port; | |
2279 | spp->smk_sock = sk; | |
2280 | spp->smk_in = ssp->smk_in; | |
2281 | spp->smk_out = ssp->smk_out; | |
2282 | ||
2283 | list_add(&spp->list, &smk_ipv6_port_list); | |
2284 | return; | |
2285 | } | |
2286 | ||
2287 | /** | |
2288 | * smk_ipv6_port_check - check Smack port access | |
2289 | * @sock: socket | |
2290 | * @address: address | |
2291 | * | |
2292 | * Create or update the port list entry | |
2293 | */ | |
6ea06247 | 2294 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2295 | int act) |
2296 | { | |
2297 | __be16 *bep; | |
2298 | __be32 *be32p; | |
c6739443 CS |
2299 | struct smk_port_label *spp; |
2300 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 2301 | struct smack_known *skp; |
c6739443 | 2302 | unsigned short port = 0; |
21c7eae2 | 2303 | struct smack_known *object; |
c6739443 | 2304 | struct smk_audit_info ad; |
d166c802 | 2305 | int rc; |
c6739443 CS |
2306 | #ifdef CONFIG_AUDIT |
2307 | struct lsm_network_audit net; | |
2308 | #endif | |
2309 | ||
2310 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2311 | skp = smack_net_ambient; |
21c7eae2 | 2312 | object = ssp->smk_in; |
c6739443 | 2313 | } else { |
2f823ff8 | 2314 | skp = ssp->smk_out; |
21c7eae2 | 2315 | object = smack_net_ambient; |
c6739443 CS |
2316 | } |
2317 | ||
2318 | /* | |
2319 | * Get the IP address and port from the address. | |
2320 | */ | |
6ea06247 CS |
2321 | port = ntohs(address->sin6_port); |
2322 | bep = (__be16 *)(&address->sin6_addr); | |
2323 | be32p = (__be32 *)(&address->sin6_addr); | |
c6739443 CS |
2324 | |
2325 | /* | |
2326 | * It's remote, so port lookup does no good. | |
2327 | */ | |
2328 | if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) | |
2329 | goto auditout; | |
2330 | ||
2331 | /* | |
2332 | * It's local so the send check has to have passed. | |
2333 | */ | |
2334 | if (act == SMK_RECEIVING) { | |
2f823ff8 | 2335 | skp = &smack_known_web; |
c6739443 CS |
2336 | goto auditout; |
2337 | } | |
2338 | ||
2339 | list_for_each_entry(spp, &smk_ipv6_port_list, list) { | |
2340 | if (spp->smk_port != port) | |
2341 | continue; | |
21c7eae2 | 2342 | object = spp->smk_in; |
c6739443 | 2343 | if (act == SMK_CONNECTING) |
54e70ec5 | 2344 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2345 | break; |
2346 | } | |
2347 | ||
2348 | auditout: | |
2349 | ||
2350 | #ifdef CONFIG_AUDIT | |
2351 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2352 | ad.a.u.net->family = sk->sk_family; | |
2353 | ad.a.u.net->dport = port; | |
2354 | if (act == SMK_RECEIVING) | |
6ea06247 | 2355 | ad.a.u.net->v6info.saddr = address->sin6_addr; |
c6739443 | 2356 | else |
6ea06247 | 2357 | ad.a.u.net->v6info.daddr = address->sin6_addr; |
c6739443 | 2358 | #endif |
d166c802 CS |
2359 | rc = smk_access(skp, object, MAY_WRITE, &ad); |
2360 | rc = smk_bu_note("IPv6 port check", skp, object, MAY_WRITE, rc); | |
2361 | return rc; | |
c6739443 CS |
2362 | } |
2363 | ||
e114e473 CS |
2364 | /** |
2365 | * smack_inode_setsecurity - set smack xattrs | |
2366 | * @inode: the object | |
2367 | * @name: attribute name | |
2368 | * @value: attribute value | |
2369 | * @size: size of the attribute | |
2370 | * @flags: unused | |
2371 | * | |
2372 | * Sets the named attribute in the appropriate blob | |
2373 | * | |
2374 | * Returns 0 on success, or an error code | |
2375 | */ | |
2376 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2377 | const void *value, size_t size, int flags) | |
2378 | { | |
2f823ff8 | 2379 | struct smack_known *skp; |
e114e473 CS |
2380 | struct inode_smack *nsp = inode->i_security; |
2381 | struct socket_smack *ssp; | |
2382 | struct socket *sock; | |
4bc87e62 | 2383 | int rc = 0; |
e114e473 | 2384 | |
f7112e6c | 2385 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2386 | return -EINVAL; |
e114e473 | 2387 | |
2f823ff8 CS |
2388 | skp = smk_import_entry(value, size); |
2389 | if (skp == NULL) | |
e114e473 CS |
2390 | return -EINVAL; |
2391 | ||
2392 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2393 | nsp->smk_inode = skp; |
ddd29ec6 | 2394 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2395 | return 0; |
2396 | } | |
2397 | /* | |
2398 | * The rest of the Smack xattrs are only on sockets. | |
2399 | */ | |
2400 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2401 | return -EOPNOTSUPP; | |
2402 | ||
2403 | sock = SOCKET_I(inode); | |
2e1d146a | 2404 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2405 | return -EOPNOTSUPP; |
2406 | ||
2407 | ssp = sock->sk->sk_security; | |
2408 | ||
2409 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2410 | ssp->smk_in = skp; |
e114e473 | 2411 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2412 | ssp->smk_out = skp; |
c6739443 | 2413 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2414 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2415 | if (rc != 0) | |
2416 | printk(KERN_WARNING | |
2417 | "Smack: \"%s\" netlbl error %d.\n", | |
2418 | __func__, -rc); | |
2419 | } | |
e114e473 CS |
2420 | } else |
2421 | return -EOPNOTSUPP; | |
2422 | ||
c6739443 CS |
2423 | if (sock->sk->sk_family == PF_INET6) |
2424 | smk_ipv6_port_label(sock, NULL); | |
2425 | ||
e114e473 CS |
2426 | return 0; |
2427 | } | |
2428 | ||
2429 | /** | |
2430 | * smack_socket_post_create - finish socket setup | |
2431 | * @sock: the socket | |
2432 | * @family: protocol family | |
2433 | * @type: unused | |
2434 | * @protocol: unused | |
2435 | * @kern: unused | |
2436 | * | |
2437 | * Sets the netlabel information on the socket | |
2438 | * | |
2439 | * Returns 0 on success, and error code otherwise | |
2440 | */ | |
2441 | static int smack_socket_post_create(struct socket *sock, int family, | |
2442 | int type, int protocol, int kern) | |
2443 | { | |
2e1d146a | 2444 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2445 | return 0; |
2446 | /* | |
2447 | * Set the outbound netlbl. | |
2448 | */ | |
6d3dc07c CS |
2449 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2450 | } | |
2451 | ||
c6739443 CS |
2452 | /** |
2453 | * smack_socket_bind - record port binding information. | |
2454 | * @sock: the socket | |
2455 | * @address: the port address | |
2456 | * @addrlen: size of the address | |
2457 | * | |
2458 | * Records the label bound to a port. | |
2459 | * | |
2460 | * Returns 0 | |
2461 | */ | |
2462 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2463 | int addrlen) | |
2464 | { | |
2465 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2466 | smk_ipv6_port_label(sock, address); | |
2467 | ||
2468 | return 0; | |
2469 | } | |
2470 | ||
6d3dc07c CS |
2471 | /** |
2472 | * smack_socket_connect - connect access check | |
2473 | * @sock: the socket | |
2474 | * @sap: the other end | |
2475 | * @addrlen: size of sap | |
2476 | * | |
2477 | * Verifies that a connection may be possible | |
2478 | * | |
2479 | * Returns 0 on success, and error code otherwise | |
2480 | */ | |
2481 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2482 | int addrlen) | |
2483 | { | |
c6739443 CS |
2484 | int rc = 0; |
2485 | ||
2486 | if (sock->sk == NULL) | |
6d3dc07c | 2487 | return 0; |
6d3dc07c | 2488 | |
c6739443 CS |
2489 | switch (sock->sk->sk_family) { |
2490 | case PF_INET: | |
2491 | if (addrlen < sizeof(struct sockaddr_in)) | |
2492 | return -EINVAL; | |
2493 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2494 | break; | |
2495 | case PF_INET6: | |
2496 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2497 | return -EINVAL; | |
6ea06247 CS |
2498 | rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, |
2499 | SMK_CONNECTING); | |
c6739443 CS |
2500 | break; |
2501 | } | |
2502 | return rc; | |
e114e473 CS |
2503 | } |
2504 | ||
2505 | /** | |
2506 | * smack_flags_to_may - convert S_ to MAY_ values | |
2507 | * @flags: the S_ value | |
2508 | * | |
2509 | * Returns the equivalent MAY_ value | |
2510 | */ | |
2511 | static int smack_flags_to_may(int flags) | |
2512 | { | |
2513 | int may = 0; | |
2514 | ||
2515 | if (flags & S_IRUGO) | |
2516 | may |= MAY_READ; | |
2517 | if (flags & S_IWUGO) | |
2518 | may |= MAY_WRITE; | |
2519 | if (flags & S_IXUGO) | |
2520 | may |= MAY_EXEC; | |
2521 | ||
2522 | return may; | |
2523 | } | |
2524 | ||
2525 | /** | |
2526 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2527 | * @msg: the object | |
2528 | * | |
2529 | * Returns 0 | |
2530 | */ | |
2531 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2532 | { | |
2f823ff8 CS |
2533 | struct smack_known *skp = smk_of_current(); |
2534 | ||
21c7eae2 | 2535 | msg->security = skp; |
e114e473 CS |
2536 | return 0; |
2537 | } | |
2538 | ||
2539 | /** | |
2540 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2541 | * @msg: the object | |
2542 | * | |
2543 | * Clears the blob pointer | |
2544 | */ | |
2545 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2546 | { | |
2547 | msg->security = NULL; | |
2548 | } | |
2549 | ||
2550 | /** | |
2551 | * smack_of_shm - the smack pointer for the shm | |
2552 | * @shp: the object | |
2553 | * | |
2554 | * Returns a pointer to the smack value | |
2555 | */ | |
21c7eae2 | 2556 | static struct smack_known *smack_of_shm(struct shmid_kernel *shp) |
e114e473 | 2557 | { |
21c7eae2 | 2558 | return (struct smack_known *)shp->shm_perm.security; |
e114e473 CS |
2559 | } |
2560 | ||
2561 | /** | |
2562 | * smack_shm_alloc_security - Set the security blob for shm | |
2563 | * @shp: the object | |
2564 | * | |
2565 | * Returns 0 | |
2566 | */ | |
2567 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2568 | { | |
2569 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2f823ff8 | 2570 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2571 | |
21c7eae2 | 2572 | isp->security = skp; |
e114e473 CS |
2573 | return 0; |
2574 | } | |
2575 | ||
2576 | /** | |
2577 | * smack_shm_free_security - Clear the security blob for shm | |
2578 | * @shp: the object | |
2579 | * | |
2580 | * Clears the blob pointer | |
2581 | */ | |
2582 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2583 | { | |
2584 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2585 | ||
2586 | isp->security = NULL; | |
2587 | } | |
2588 | ||
ecfcc53f EB |
2589 | /** |
2590 | * smk_curacc_shm : check if current has access on shm | |
2591 | * @shp : the object | |
2592 | * @access : access requested | |
2593 | * | |
2594 | * Returns 0 if current has the requested access, error code otherwise | |
2595 | */ | |
2596 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2597 | { | |
21c7eae2 | 2598 | struct smack_known *ssp = smack_of_shm(shp); |
ecfcc53f | 2599 | struct smk_audit_info ad; |
d166c802 | 2600 | int rc; |
ecfcc53f EB |
2601 | |
2602 | #ifdef CONFIG_AUDIT | |
2603 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2604 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2605 | #endif | |
d166c802 CS |
2606 | rc = smk_curacc(ssp, access, &ad); |
2607 | rc = smk_bu_current("shm", ssp, access, rc); | |
2608 | return rc; | |
ecfcc53f EB |
2609 | } |
2610 | ||
e114e473 CS |
2611 | /** |
2612 | * smack_shm_associate - Smack access check for shm | |
2613 | * @shp: the object | |
2614 | * @shmflg: access requested | |
2615 | * | |
2616 | * Returns 0 if current has the requested access, error code otherwise | |
2617 | */ | |
2618 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2619 | { | |
e114e473 CS |
2620 | int may; |
2621 | ||
2622 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2623 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2624 | } |
2625 | ||
2626 | /** | |
2627 | * smack_shm_shmctl - Smack access check for shm | |
2628 | * @shp: the object | |
2629 | * @cmd: what it wants to do | |
2630 | * | |
2631 | * Returns 0 if current has the requested access, error code otherwise | |
2632 | */ | |
2633 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2634 | { | |
e114e473 CS |
2635 | int may; |
2636 | ||
2637 | switch (cmd) { | |
2638 | case IPC_STAT: | |
2639 | case SHM_STAT: | |
2640 | may = MAY_READ; | |
2641 | break; | |
2642 | case IPC_SET: | |
2643 | case SHM_LOCK: | |
2644 | case SHM_UNLOCK: | |
2645 | case IPC_RMID: | |
2646 | may = MAY_READWRITE; | |
2647 | break; | |
2648 | case IPC_INFO: | |
2649 | case SHM_INFO: | |
2650 | /* | |
2651 | * System level information. | |
2652 | */ | |
2653 | return 0; | |
2654 | default: | |
2655 | return -EINVAL; | |
2656 | } | |
ecfcc53f | 2657 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2658 | } |
2659 | ||
2660 | /** | |
2661 | * smack_shm_shmat - Smack access for shmat | |
2662 | * @shp: the object | |
2663 | * @shmaddr: unused | |
2664 | * @shmflg: access requested | |
2665 | * | |
2666 | * Returns 0 if current has the requested access, error code otherwise | |
2667 | */ | |
2668 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2669 | int shmflg) | |
2670 | { | |
e114e473 CS |
2671 | int may; |
2672 | ||
2673 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2674 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2675 | } |
2676 | ||
2677 | /** | |
2678 | * smack_of_sem - the smack pointer for the sem | |
2679 | * @sma: the object | |
2680 | * | |
2681 | * Returns a pointer to the smack value | |
2682 | */ | |
21c7eae2 | 2683 | static struct smack_known *smack_of_sem(struct sem_array *sma) |
e114e473 | 2684 | { |
21c7eae2 | 2685 | return (struct smack_known *)sma->sem_perm.security; |
e114e473 CS |
2686 | } |
2687 | ||
2688 | /** | |
2689 | * smack_sem_alloc_security - Set the security blob for sem | |
2690 | * @sma: the object | |
2691 | * | |
2692 | * Returns 0 | |
2693 | */ | |
2694 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2695 | { | |
2696 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2f823ff8 | 2697 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2698 | |
21c7eae2 | 2699 | isp->security = skp; |
e114e473 CS |
2700 | return 0; |
2701 | } | |
2702 | ||
2703 | /** | |
2704 | * smack_sem_free_security - Clear the security blob for sem | |
2705 | * @sma: the object | |
2706 | * | |
2707 | * Clears the blob pointer | |
2708 | */ | |
2709 | static void smack_sem_free_security(struct sem_array *sma) | |
2710 | { | |
2711 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2712 | ||
2713 | isp->security = NULL; | |
2714 | } | |
2715 | ||
ecfcc53f EB |
2716 | /** |
2717 | * smk_curacc_sem : check if current has access on sem | |
2718 | * @sma : the object | |
2719 | * @access : access requested | |
2720 | * | |
2721 | * Returns 0 if current has the requested access, error code otherwise | |
2722 | */ | |
2723 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2724 | { | |
21c7eae2 | 2725 | struct smack_known *ssp = smack_of_sem(sma); |
ecfcc53f | 2726 | struct smk_audit_info ad; |
d166c802 | 2727 | int rc; |
ecfcc53f EB |
2728 | |
2729 | #ifdef CONFIG_AUDIT | |
2730 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2731 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2732 | #endif | |
d166c802 CS |
2733 | rc = smk_curacc(ssp, access, &ad); |
2734 | rc = smk_bu_current("sem", ssp, access, rc); | |
2735 | return rc; | |
ecfcc53f EB |
2736 | } |
2737 | ||
e114e473 CS |
2738 | /** |
2739 | * smack_sem_associate - Smack access check for sem | |
2740 | * @sma: the object | |
2741 | * @semflg: access requested | |
2742 | * | |
2743 | * Returns 0 if current has the requested access, error code otherwise | |
2744 | */ | |
2745 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2746 | { | |
e114e473 CS |
2747 | int may; |
2748 | ||
2749 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2750 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2751 | } |
2752 | ||
2753 | /** | |
2754 | * smack_sem_shmctl - Smack access check for sem | |
2755 | * @sma: the object | |
2756 | * @cmd: what it wants to do | |
2757 | * | |
2758 | * Returns 0 if current has the requested access, error code otherwise | |
2759 | */ | |
2760 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2761 | { | |
e114e473 CS |
2762 | int may; |
2763 | ||
2764 | switch (cmd) { | |
2765 | case GETPID: | |
2766 | case GETNCNT: | |
2767 | case GETZCNT: | |
2768 | case GETVAL: | |
2769 | case GETALL: | |
2770 | case IPC_STAT: | |
2771 | case SEM_STAT: | |
2772 | may = MAY_READ; | |
2773 | break; | |
2774 | case SETVAL: | |
2775 | case SETALL: | |
2776 | case IPC_RMID: | |
2777 | case IPC_SET: | |
2778 | may = MAY_READWRITE; | |
2779 | break; | |
2780 | case IPC_INFO: | |
2781 | case SEM_INFO: | |
2782 | /* | |
2783 | * System level information | |
2784 | */ | |
2785 | return 0; | |
2786 | default: | |
2787 | return -EINVAL; | |
2788 | } | |
2789 | ||
ecfcc53f | 2790 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2791 | } |
2792 | ||
2793 | /** | |
2794 | * smack_sem_semop - Smack checks of semaphore operations | |
2795 | * @sma: the object | |
2796 | * @sops: unused | |
2797 | * @nsops: unused | |
2798 | * @alter: unused | |
2799 | * | |
2800 | * Treated as read and write in all cases. | |
2801 | * | |
2802 | * Returns 0 if access is allowed, error code otherwise | |
2803 | */ | |
2804 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2805 | unsigned nsops, int alter) | |
2806 | { | |
ecfcc53f | 2807 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2808 | } |
2809 | ||
2810 | /** | |
2811 | * smack_msg_alloc_security - Set the security blob for msg | |
2812 | * @msq: the object | |
2813 | * | |
2814 | * Returns 0 | |
2815 | */ | |
2816 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2817 | { | |
2818 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2f823ff8 | 2819 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2820 | |
21c7eae2 | 2821 | kisp->security = skp; |
e114e473 CS |
2822 | return 0; |
2823 | } | |
2824 | ||
2825 | /** | |
2826 | * smack_msg_free_security - Clear the security blob for msg | |
2827 | * @msq: the object | |
2828 | * | |
2829 | * Clears the blob pointer | |
2830 | */ | |
2831 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2832 | { | |
2833 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2834 | ||
2835 | kisp->security = NULL; | |
2836 | } | |
2837 | ||
2838 | /** | |
2839 | * smack_of_msq - the smack pointer for the msq | |
2840 | * @msq: the object | |
2841 | * | |
21c7eae2 | 2842 | * Returns a pointer to the smack label entry |
e114e473 | 2843 | */ |
21c7eae2 | 2844 | static struct smack_known *smack_of_msq(struct msg_queue *msq) |
e114e473 | 2845 | { |
21c7eae2 | 2846 | return (struct smack_known *)msq->q_perm.security; |
e114e473 CS |
2847 | } |
2848 | ||
ecfcc53f EB |
2849 | /** |
2850 | * smk_curacc_msq : helper to check if current has access on msq | |
2851 | * @msq : the msq | |
2852 | * @access : access requested | |
2853 | * | |
2854 | * return 0 if current has access, error otherwise | |
2855 | */ | |
2856 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2857 | { | |
21c7eae2 | 2858 | struct smack_known *msp = smack_of_msq(msq); |
ecfcc53f | 2859 | struct smk_audit_info ad; |
d166c802 | 2860 | int rc; |
ecfcc53f EB |
2861 | |
2862 | #ifdef CONFIG_AUDIT | |
2863 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2864 | ad.a.u.ipc_id = msq->q_perm.id; | |
2865 | #endif | |
d166c802 CS |
2866 | rc = smk_curacc(msp, access, &ad); |
2867 | rc = smk_bu_current("msq", msp, access, rc); | |
2868 | return rc; | |
ecfcc53f EB |
2869 | } |
2870 | ||
e114e473 CS |
2871 | /** |
2872 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2873 | * @msq: the object | |
2874 | * @msqflg: access requested | |
2875 | * | |
2876 | * Returns 0 if current has the requested access, error code otherwise | |
2877 | */ | |
2878 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2879 | { | |
e114e473 CS |
2880 | int may; |
2881 | ||
2882 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2883 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2884 | } |
2885 | ||
2886 | /** | |
2887 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2888 | * @msq: the object | |
2889 | * @cmd: what it wants to do | |
2890 | * | |
2891 | * Returns 0 if current has the requested access, error code otherwise | |
2892 | */ | |
2893 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2894 | { | |
e114e473 CS |
2895 | int may; |
2896 | ||
2897 | switch (cmd) { | |
2898 | case IPC_STAT: | |
2899 | case MSG_STAT: | |
2900 | may = MAY_READ; | |
2901 | break; | |
2902 | case IPC_SET: | |
2903 | case IPC_RMID: | |
2904 | may = MAY_READWRITE; | |
2905 | break; | |
2906 | case IPC_INFO: | |
2907 | case MSG_INFO: | |
2908 | /* | |
2909 | * System level information | |
2910 | */ | |
2911 | return 0; | |
2912 | default: | |
2913 | return -EINVAL; | |
2914 | } | |
2915 | ||
ecfcc53f | 2916 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2917 | } |
2918 | ||
2919 | /** | |
2920 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2921 | * @msq: the object | |
2922 | * @msg: unused | |
2923 | * @msqflg: access requested | |
2924 | * | |
2925 | * Returns 0 if current has the requested access, error code otherwise | |
2926 | */ | |
2927 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2928 | int msqflg) | |
2929 | { | |
ecfcc53f | 2930 | int may; |
e114e473 | 2931 | |
ecfcc53f EB |
2932 | may = smack_flags_to_may(msqflg); |
2933 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2934 | } |
2935 | ||
2936 | /** | |
2937 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2938 | * @msq: the object | |
2939 | * @msg: unused | |
2940 | * @target: unused | |
2941 | * @type: unused | |
2942 | * @mode: unused | |
2943 | * | |
2944 | * Returns 0 if current has read and write access, error code otherwise | |
2945 | */ | |
2946 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2947 | struct task_struct *target, long type, int mode) | |
2948 | { | |
ecfcc53f | 2949 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2950 | } |
2951 | ||
2952 | /** | |
2953 | * smack_ipc_permission - Smack access for ipc_permission() | |
2954 | * @ipp: the object permissions | |
2955 | * @flag: access requested | |
2956 | * | |
2957 | * Returns 0 if current has read and write access, error code otherwise | |
2958 | */ | |
2959 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2960 | { | |
21c7eae2 | 2961 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
2962 | int may = smack_flags_to_may(flag); |
2963 | struct smk_audit_info ad; | |
d166c802 | 2964 | int rc; |
e114e473 | 2965 | |
ecfcc53f EB |
2966 | #ifdef CONFIG_AUDIT |
2967 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2968 | ad.a.u.ipc_id = ipp->id; | |
2969 | #endif | |
21c7eae2 LP |
2970 | rc = smk_curacc(iskp, may, &ad); |
2971 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 2972 | return rc; |
e114e473 CS |
2973 | } |
2974 | ||
d20bdda6 AD |
2975 | /** |
2976 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2977 | * @ipp: the object permissions |
d20bdda6 AD |
2978 | * @secid: where result will be saved |
2979 | */ | |
2980 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2981 | { | |
21c7eae2 | 2982 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 2983 | |
21c7eae2 | 2984 | *secid = iskp->smk_secid; |
d20bdda6 AD |
2985 | } |
2986 | ||
e114e473 CS |
2987 | /** |
2988 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2989 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2990 | * @inode: the object |
2991 | * | |
2992 | * Set the inode's security blob if it hasn't been done already. | |
2993 | */ | |
2994 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2995 | { | |
2996 | struct super_block *sbp; | |
2997 | struct superblock_smack *sbsp; | |
2998 | struct inode_smack *isp; | |
2f823ff8 CS |
2999 | struct smack_known *skp; |
3000 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3001 | struct smack_known *final; |
5c6d1125 JS |
3002 | char trattr[TRANS_TRUE_SIZE]; |
3003 | int transflag = 0; | |
2267b13a | 3004 | int rc; |
e114e473 CS |
3005 | struct dentry *dp; |
3006 | ||
3007 | if (inode == NULL) | |
3008 | return; | |
3009 | ||
3010 | isp = inode->i_security; | |
3011 | ||
3012 | mutex_lock(&isp->smk_lock); | |
3013 | /* | |
3014 | * If the inode is already instantiated | |
3015 | * take the quick way out | |
3016 | */ | |
3017 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3018 | goto unlockandout; | |
3019 | ||
3020 | sbp = inode->i_sb; | |
3021 | sbsp = sbp->s_security; | |
3022 | /* | |
3023 | * We're going to use the superblock default label | |
3024 | * if there's no label on the file. | |
3025 | */ | |
3026 | final = sbsp->smk_default; | |
3027 | ||
e97dcb0e CS |
3028 | /* |
3029 | * If this is the root inode the superblock | |
3030 | * may be in the process of initialization. | |
3031 | * If that is the case use the root value out | |
3032 | * of the superblock. | |
3033 | */ | |
3034 | if (opt_dentry->d_parent == opt_dentry) { | |
36ea735b CS |
3035 | if (sbp->s_magic == CGROUP_SUPER_MAGIC) { |
3036 | /* | |
3037 | * The cgroup filesystem is never mounted, | |
3038 | * so there's no opportunity to set the mount | |
3039 | * options. | |
3040 | */ | |
21c7eae2 LP |
3041 | sbsp->smk_root = &smack_known_star; |
3042 | sbsp->smk_default = &smack_known_star; | |
36ea735b | 3043 | } |
e97dcb0e CS |
3044 | isp->smk_inode = sbsp->smk_root; |
3045 | isp->smk_flags |= SMK_INODE_INSTANT; | |
3046 | goto unlockandout; | |
3047 | } | |
3048 | ||
e114e473 CS |
3049 | /* |
3050 | * This is pretty hackish. | |
3051 | * Casey says that we shouldn't have to do | |
3052 | * file system specific code, but it does help | |
3053 | * with keeping it simple. | |
3054 | */ | |
3055 | switch (sbp->s_magic) { | |
3056 | case SMACK_MAGIC: | |
36ea735b CS |
3057 | case PIPEFS_MAGIC: |
3058 | case SOCKFS_MAGIC: | |
3059 | case CGROUP_SUPER_MAGIC: | |
e114e473 | 3060 | /* |
25985edc | 3061 | * Casey says that it's a little embarrassing |
e114e473 CS |
3062 | * that the smack file system doesn't do |
3063 | * extended attributes. | |
36ea735b | 3064 | * |
e114e473 | 3065 | * Casey says pipes are easy (?) |
36ea735b CS |
3066 | * |
3067 | * Socket access is controlled by the socket | |
3068 | * structures associated with the task involved. | |
3069 | * | |
3070 | * Cgroupfs is special | |
e114e473 | 3071 | */ |
21c7eae2 | 3072 | final = &smack_known_star; |
e114e473 CS |
3073 | break; |
3074 | case DEVPTS_SUPER_MAGIC: | |
3075 | /* | |
3076 | * devpts seems content with the label of the task. | |
3077 | * Programs that change smack have to treat the | |
3078 | * pty with respect. | |
3079 | */ | |
21c7eae2 | 3080 | final = ckp; |
e114e473 | 3081 | break; |
e114e473 CS |
3082 | case PROC_SUPER_MAGIC: |
3083 | /* | |
3084 | * Casey says procfs appears not to care. | |
3085 | * The superblock default suffices. | |
3086 | */ | |
3087 | break; | |
3088 | case TMPFS_MAGIC: | |
3089 | /* | |
3090 | * Device labels should come from the filesystem, | |
3091 | * but watch out, because they're volitile, | |
3092 | * getting recreated on every reboot. | |
3093 | */ | |
21c7eae2 | 3094 | final = &smack_known_star; |
e114e473 CS |
3095 | /* |
3096 | * No break. | |
3097 | * | |
3098 | * If a smack value has been set we want to use it, | |
3099 | * but since tmpfs isn't giving us the opportunity | |
3100 | * to set mount options simulate setting the | |
3101 | * superblock default. | |
3102 | */ | |
3103 | default: | |
3104 | /* | |
3105 | * This isn't an understood special case. | |
3106 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3107 | */ |
3108 | ||
3109 | /* | |
3110 | * UNIX domain sockets use lower level socket data. | |
3111 | */ | |
3112 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3113 | final = &smack_known_star; |
b4e0d5f0 CS |
3114 | break; |
3115 | } | |
3116 | /* | |
e114e473 CS |
3117 | * No xattr support means, alas, no SMACK label. |
3118 | * Use the aforeapplied default. | |
3119 | * It would be curious if the label of the task | |
3120 | * does not match that assigned. | |
3121 | */ | |
3122 | if (inode->i_op->getxattr == NULL) | |
3123 | break; | |
3124 | /* | |
3125 | * Get the dentry for xattr. | |
3126 | */ | |
3e62cbb8 | 3127 | dp = dget(opt_dentry); |
2f823ff8 CS |
3128 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
3129 | if (skp != NULL) | |
21c7eae2 | 3130 | final = skp; |
2267b13a CS |
3131 | |
3132 | /* | |
3133 | * Transmuting directory | |
3134 | */ | |
3135 | if (S_ISDIR(inode->i_mode)) { | |
3136 | /* | |
3137 | * If this is a new directory and the label was | |
3138 | * transmuted when the inode was initialized | |
3139 | * set the transmute attribute on the directory | |
3140 | * and mark the inode. | |
3141 | * | |
3142 | * If there is a transmute attribute on the | |
3143 | * directory mark the inode. | |
3144 | */ | |
3145 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3146 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
3147 | rc = inode->i_op->setxattr(dp, | |
5c6d1125 | 3148 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3149 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3150 | 0); | |
3151 | } else { | |
3152 | rc = inode->i_op->getxattr(dp, | |
3153 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3154 | TRANS_TRUE_SIZE); | |
3155 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3156 | TRANS_TRUE_SIZE) != 0) | |
3157 | rc = -EINVAL; | |
5c6d1125 | 3158 | } |
2267b13a CS |
3159 | if (rc >= 0) |
3160 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3161 | } |
19760ad0 CS |
3162 | /* |
3163 | * Don't let the exec or mmap label be "*" or "@". | |
3164 | */ | |
3165 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3166 | if (skp == &smack_known_star || skp == &smack_known_web) | |
3167 | skp = NULL; | |
3168 | isp->smk_task = skp; | |
3169 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); | |
3170 | if (skp == &smack_known_star || skp == &smack_known_web) | |
3171 | skp = NULL; | |
3172 | isp->smk_mmap = skp; | |
676dac4b | 3173 | |
e114e473 CS |
3174 | dput(dp); |
3175 | break; | |
3176 | } | |
3177 | ||
3178 | if (final == NULL) | |
21c7eae2 | 3179 | isp->smk_inode = ckp; |
e114e473 CS |
3180 | else |
3181 | isp->smk_inode = final; | |
3182 | ||
5c6d1125 | 3183 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3184 | |
3185 | unlockandout: | |
3186 | mutex_unlock(&isp->smk_lock); | |
3187 | return; | |
3188 | } | |
3189 | ||
3190 | /** | |
3191 | * smack_getprocattr - Smack process attribute access | |
3192 | * @p: the object task | |
3193 | * @name: the name of the attribute in /proc/.../attr | |
3194 | * @value: where to put the result | |
3195 | * | |
3196 | * Places a copy of the task Smack into value | |
3197 | * | |
3198 | * Returns the length of the smack label or an error code | |
3199 | */ | |
3200 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3201 | { | |
2f823ff8 | 3202 | struct smack_known *skp = smk_of_task(task_security(p)); |
e114e473 CS |
3203 | char *cp; |
3204 | int slen; | |
3205 | ||
3206 | if (strcmp(name, "current") != 0) | |
3207 | return -EINVAL; | |
3208 | ||
2f823ff8 | 3209 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3210 | if (cp == NULL) |
3211 | return -ENOMEM; | |
3212 | ||
3213 | slen = strlen(cp); | |
3214 | *value = cp; | |
3215 | return slen; | |
3216 | } | |
3217 | ||
3218 | /** | |
3219 | * smack_setprocattr - Smack process attribute setting | |
3220 | * @p: the object task | |
3221 | * @name: the name of the attribute in /proc/.../attr | |
3222 | * @value: the value to set | |
3223 | * @size: the size of the value | |
3224 | * | |
3225 | * Sets the Smack value of the task. Only setting self | |
3226 | * is permitted and only with privilege | |
3227 | * | |
3228 | * Returns the length of the smack label or an error code | |
3229 | */ | |
3230 | static int smack_setprocattr(struct task_struct *p, char *name, | |
3231 | void *value, size_t size) | |
3232 | { | |
676dac4b | 3233 | struct task_smack *tsp; |
d84f4f99 | 3234 | struct cred *new; |
2f823ff8 | 3235 | struct smack_known *skp; |
e114e473 | 3236 | |
e114e473 CS |
3237 | /* |
3238 | * Changing another process' Smack value is too dangerous | |
3239 | * and supports no sane use case. | |
3240 | */ | |
3241 | if (p != current) | |
3242 | return -EPERM; | |
3243 | ||
1880eff7 | 3244 | if (!smack_privileged(CAP_MAC_ADMIN)) |
5cd9c58f DH |
3245 | return -EPERM; |
3246 | ||
f7112e6c | 3247 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3248 | return -EINVAL; |
3249 | ||
3250 | if (strcmp(name, "current") != 0) | |
3251 | return -EINVAL; | |
3252 | ||
2f823ff8 CS |
3253 | skp = smk_import_entry(value, size); |
3254 | if (skp == NULL) | |
e114e473 CS |
3255 | return -EINVAL; |
3256 | ||
6d3dc07c CS |
3257 | /* |
3258 | * No process is ever allowed the web ("@") label. | |
3259 | */ | |
2f823ff8 | 3260 | if (skp == &smack_known_web) |
6d3dc07c CS |
3261 | return -EPERM; |
3262 | ||
d84f4f99 | 3263 | new = prepare_creds(); |
6d3dc07c | 3264 | if (new == NULL) |
d84f4f99 | 3265 | return -ENOMEM; |
7898e1f8 | 3266 | |
46a2f3b9 | 3267 | tsp = new->security; |
2f823ff8 | 3268 | tsp->smk_task = skp; |
7898e1f8 | 3269 | |
d84f4f99 | 3270 | commit_creds(new); |
e114e473 CS |
3271 | return size; |
3272 | } | |
3273 | ||
3274 | /** | |
3275 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3276 | * @sock: one sock |
3277 | * @other: the other sock | |
e114e473 CS |
3278 | * @newsk: unused |
3279 | * | |
3280 | * Return 0 if a subject with the smack of sock could access | |
3281 | * an object with the smack of other, otherwise an error code | |
3282 | */ | |
3610cda5 DM |
3283 | static int smack_unix_stream_connect(struct sock *sock, |
3284 | struct sock *other, struct sock *newsk) | |
e114e473 | 3285 | { |
2f823ff8 | 3286 | struct smack_known *skp; |
54e70ec5 | 3287 | struct smack_known *okp; |
d2e7ad19 JM |
3288 | struct socket_smack *ssp = sock->sk_security; |
3289 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3290 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3291 | struct smk_audit_info ad; |
b4e0d5f0 | 3292 | int rc = 0; |
923e9a13 KC |
3293 | #ifdef CONFIG_AUDIT |
3294 | struct lsm_network_audit net; | |
923e9a13 | 3295 | #endif |
b4e0d5f0 | 3296 | |
2f823ff8 CS |
3297 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3298 | skp = ssp->smk_out; | |
54e70ec5 CS |
3299 | okp = osp->smk_out; |
3300 | #ifdef CONFIG_AUDIT | |
3301 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3302 | smk_ad_setfield_u_net_sk(&ad, other); | |
3303 | #endif | |
21c7eae2 LP |
3304 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3305 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3306 | if (rc == 0) { |
21c7eae2 LP |
3307 | rc = smk_access(okp, skp, MAY_WRITE, NULL); |
3308 | rc = smk_bu_note("UDS connect", okp, skp, | |
d166c802 CS |
3309 | MAY_WRITE, rc); |
3310 | } | |
2f823ff8 | 3311 | } |
b4e0d5f0 | 3312 | |
975d5e55 CS |
3313 | /* |
3314 | * Cross reference the peer labels for SO_PEERSEC. | |
3315 | */ | |
3316 | if (rc == 0) { | |
54e70ec5 CS |
3317 | nsp->smk_packet = ssp->smk_out; |
3318 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3319 | } |
3320 | ||
b4e0d5f0 | 3321 | return rc; |
e114e473 CS |
3322 | } |
3323 | ||
3324 | /** | |
3325 | * smack_unix_may_send - Smack access on UDS | |
3326 | * @sock: one socket | |
3327 | * @other: the other socket | |
3328 | * | |
3329 | * Return 0 if a subject with the smack of sock could access | |
3330 | * an object with the smack of other, otherwise an error code | |
3331 | */ | |
3332 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3333 | { | |
b4e0d5f0 CS |
3334 | struct socket_smack *ssp = sock->sk->sk_security; |
3335 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3336 | struct smk_audit_info ad; |
d166c802 | 3337 | int rc; |
e114e473 | 3338 | |
923e9a13 KC |
3339 | #ifdef CONFIG_AUDIT |
3340 | struct lsm_network_audit net; | |
3341 | ||
48c62af6 | 3342 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3343 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3344 | #endif |
b4e0d5f0 | 3345 | |
2f823ff8 CS |
3346 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3347 | return 0; | |
b4e0d5f0 | 3348 | |
21c7eae2 LP |
3349 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3350 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3351 | return rc; |
e114e473 CS |
3352 | } |
3353 | ||
6d3dc07c CS |
3354 | /** |
3355 | * smack_socket_sendmsg - Smack check based on destination host | |
3356 | * @sock: the socket | |
251a2a95 | 3357 | * @msg: the message |
6d3dc07c CS |
3358 | * @size: the size of the message |
3359 | * | |
c6739443 CS |
3360 | * Return 0 if the current subject can write to the destination host. |
3361 | * For IPv4 this is only a question if the destination is a single label host. | |
3362 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3363 | */ |
3364 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3365 | int size) | |
3366 | { | |
3367 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6ea06247 | 3368 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
c6739443 | 3369 | int rc = 0; |
6d3dc07c CS |
3370 | |
3371 | /* | |
3372 | * Perfectly reasonable for this to be NULL | |
3373 | */ | |
c6739443 | 3374 | if (sip == NULL) |
6d3dc07c CS |
3375 | return 0; |
3376 | ||
c6739443 CS |
3377 | switch (sip->sin_family) { |
3378 | case AF_INET: | |
3379 | rc = smack_netlabel_send(sock->sk, sip); | |
3380 | break; | |
3381 | case AF_INET6: | |
3382 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); | |
3383 | break; | |
3384 | } | |
3385 | return rc; | |
6d3dc07c CS |
3386 | } |
3387 | ||
e114e473 | 3388 | /** |
251a2a95 | 3389 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3390 | * @sap: netlabel secattr |
272cd7a8 | 3391 | * @ssp: socket security information |
e114e473 | 3392 | * |
2f823ff8 | 3393 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3394 | */ |
2f823ff8 CS |
3395 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3396 | struct socket_smack *ssp) | |
e114e473 | 3397 | { |
2f823ff8 | 3398 | struct smack_known *skp; |
f7112e6c | 3399 | int found = 0; |
677264e8 CS |
3400 | int acat; |
3401 | int kcat; | |
e114e473 | 3402 | |
6d3dc07c | 3403 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3404 | /* |
6d3dc07c | 3405 | * Looks like a CIPSO packet. |
e114e473 CS |
3406 | * If there are flags but no level netlabel isn't |
3407 | * behaving the way we expect it to. | |
3408 | * | |
f7112e6c | 3409 | * Look it up in the label table |
e114e473 CS |
3410 | * Without guidance regarding the smack value |
3411 | * for the packet fall back on the network | |
3412 | * ambient value. | |
3413 | */ | |
f7112e6c | 3414 | rcu_read_lock(); |
2f823ff8 CS |
3415 | list_for_each_entry(skp, &smack_known_list, list) { |
3416 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) | |
f7112e6c | 3417 | continue; |
677264e8 CS |
3418 | /* |
3419 | * Compare the catsets. Use the netlbl APIs. | |
3420 | */ | |
3421 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3422 | if ((skp->smk_netlabel.flags & | |
3423 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3424 | found = 1; | |
3425 | break; | |
3426 | } | |
3427 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3428 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3429 | acat + 1); | |
3430 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3431 | skp->smk_netlabel.attr.mls.cat, |
3432 | kcat + 1); | |
3433 | if (acat < 0 || kcat < 0) | |
3434 | break; | |
3435 | } | |
3436 | if (acat == kcat) { | |
3437 | found = 1; | |
3438 | break; | |
3439 | } | |
6d3dc07c | 3440 | } |
f7112e6c CS |
3441 | rcu_read_unlock(); |
3442 | ||
3443 | if (found) | |
2f823ff8 | 3444 | return skp; |
f7112e6c | 3445 | |
54e70ec5 | 3446 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3447 | return &smack_known_web; |
3448 | return &smack_known_star; | |
e114e473 | 3449 | } |
6d3dc07c CS |
3450 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
3451 | /* | |
3452 | * Looks like a fallback, which gives us a secid. | |
3453 | */ | |
2f823ff8 | 3454 | skp = smack_from_secid(sap->attr.secid); |
6d3dc07c CS |
3455 | /* |
3456 | * This has got to be a bug because it is | |
3457 | * impossible to specify a fallback without | |
3458 | * specifying the label, which will ensure | |
3459 | * it has a secid, and the only way to get a | |
3460 | * secid is from a fallback. | |
3461 | */ | |
2f823ff8 CS |
3462 | BUG_ON(skp == NULL); |
3463 | return skp; | |
e114e473 CS |
3464 | } |
3465 | /* | |
6d3dc07c CS |
3466 | * Without guidance regarding the smack value |
3467 | * for the packet fall back on the network | |
3468 | * ambient value. | |
e114e473 | 3469 | */ |
272cd7a8 | 3470 | return smack_net_ambient; |
e114e473 CS |
3471 | } |
3472 | ||
6ea06247 | 3473 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3474 | { |
c6739443 CS |
3475 | u8 nexthdr; |
3476 | int offset; | |
3477 | int proto = -EINVAL; | |
3478 | struct ipv6hdr _ipv6h; | |
3479 | struct ipv6hdr *ip6; | |
3480 | __be16 frag_off; | |
3481 | struct tcphdr _tcph, *th; | |
3482 | struct udphdr _udph, *uh; | |
3483 | struct dccp_hdr _dccph, *dh; | |
3484 | ||
3485 | sip->sin6_port = 0; | |
3486 | ||
3487 | offset = skb_network_offset(skb); | |
3488 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3489 | if (ip6 == NULL) | |
3490 | return -EINVAL; | |
3491 | sip->sin6_addr = ip6->saddr; | |
3492 | ||
3493 | nexthdr = ip6->nexthdr; | |
3494 | offset += sizeof(_ipv6h); | |
3495 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3496 | if (offset < 0) | |
3497 | return -EINVAL; | |
3498 | ||
3499 | proto = nexthdr; | |
3500 | switch (proto) { | |
3501 | case IPPROTO_TCP: | |
3502 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3503 | if (th != NULL) | |
3504 | sip->sin6_port = th->source; | |
3505 | break; | |
3506 | case IPPROTO_UDP: | |
3507 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3508 | if (uh != NULL) | |
3509 | sip->sin6_port = uh->source; | |
3510 | break; | |
3511 | case IPPROTO_DCCP: | |
3512 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3513 | if (dh != NULL) | |
3514 | sip->sin6_port = dh->dccph_sport; | |
3515 | break; | |
3516 | } | |
3517 | return proto; | |
3518 | } | |
3519 | ||
e114e473 CS |
3520 | /** |
3521 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3522 | * @sk: socket | |
3523 | * @skb: packet | |
3524 | * | |
3525 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3526 | */ | |
3527 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3528 | { | |
3529 | struct netlbl_lsm_secattr secattr; | |
3530 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3531 | struct smack_known *skp; |
6ea06247 | 3532 | struct sockaddr_in6 sadd; |
c6739443 | 3533 | int rc = 0; |
ecfcc53f | 3534 | struct smk_audit_info ad; |
923e9a13 | 3535 | #ifdef CONFIG_AUDIT |
48c62af6 | 3536 | struct lsm_network_audit net; |
923e9a13 | 3537 | #endif |
c6739443 CS |
3538 | switch (sk->sk_family) { |
3539 | case PF_INET: | |
3540 | /* | |
3541 | * Translate what netlabel gave us. | |
3542 | */ | |
3543 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3544 | |
c6739443 CS |
3545 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
3546 | if (rc == 0) | |
2f823ff8 | 3547 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3548 | else |
2f823ff8 | 3549 | skp = smack_net_ambient; |
6d3dc07c | 3550 | |
c6739443 | 3551 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3552 | |
ecfcc53f | 3553 | #ifdef CONFIG_AUDIT |
c6739443 CS |
3554 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3555 | ad.a.u.net->family = sk->sk_family; | |
3556 | ad.a.u.net->netif = skb->skb_iif; | |
3557 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3558 | #endif |
c6739443 CS |
3559 | /* |
3560 | * Receiving a packet requires that the other end | |
3561 | * be able to write here. Read access is not required. | |
3562 | * This is the simplist possible security model | |
3563 | * for networking. | |
3564 | */ | |
21c7eae2 LP |
3565 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3566 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3567 | MAY_WRITE, rc); |
c6739443 CS |
3568 | if (rc != 0) |
3569 | netlbl_skbuff_err(skb, rc, 0); | |
3570 | break; | |
3571 | case PF_INET6: | |
3572 | rc = smk_skb_to_addr_ipv6(skb, &sadd); | |
3573 | if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) | |
3574 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); | |
3575 | else | |
3576 | rc = 0; | |
3577 | break; | |
3578 | } | |
a8134296 | 3579 | return rc; |
e114e473 CS |
3580 | } |
3581 | ||
3582 | /** | |
3583 | * smack_socket_getpeersec_stream - pull in packet label | |
3584 | * @sock: the socket | |
3585 | * @optval: user's destination | |
3586 | * @optlen: size thereof | |
251a2a95 | 3587 | * @len: max thereof |
e114e473 CS |
3588 | * |
3589 | * returns zero on success, an error code otherwise | |
3590 | */ | |
3591 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3592 | char __user *optval, | |
3593 | int __user *optlen, unsigned len) | |
3594 | { | |
3595 | struct socket_smack *ssp; | |
272cd7a8 CS |
3596 | char *rcp = ""; |
3597 | int slen = 1; | |
e114e473 CS |
3598 | int rc = 0; |
3599 | ||
3600 | ssp = sock->sk->sk_security; | |
272cd7a8 | 3601 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 3602 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
3603 | slen = strlen(rcp) + 1; |
3604 | } | |
e114e473 CS |
3605 | |
3606 | if (slen > len) | |
3607 | rc = -ERANGE; | |
272cd7a8 | 3608 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3609 | rc = -EFAULT; |
3610 | ||
3611 | if (put_user(slen, optlen) != 0) | |
3612 | rc = -EFAULT; | |
3613 | ||
3614 | return rc; | |
3615 | } | |
3616 | ||
3617 | ||
3618 | /** | |
3619 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3620 | * @sock: the peer socket |
e114e473 CS |
3621 | * @skb: packet data |
3622 | * @secid: pointer to where to put the secid of the packet | |
3623 | * | |
3624 | * Sets the netlabel socket state on sk from parent | |
3625 | */ | |
3626 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3627 | struct sk_buff *skb, u32 *secid) | |
3628 | ||
3629 | { | |
3630 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 3631 | struct socket_smack *ssp = NULL; |
2f823ff8 | 3632 | struct smack_known *skp; |
b4e0d5f0 CS |
3633 | int family = PF_UNSPEC; |
3634 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3635 | int rc; |
3636 | ||
b4e0d5f0 CS |
3637 | if (skb != NULL) { |
3638 | if (skb->protocol == htons(ETH_P_IP)) | |
3639 | family = PF_INET; | |
3640 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3641 | family = PF_INET6; | |
e114e473 | 3642 | } |
b4e0d5f0 CS |
3643 | if (family == PF_UNSPEC && sock != NULL) |
3644 | family = sock->sk->sk_family; | |
e114e473 | 3645 | |
b4e0d5f0 | 3646 | if (family == PF_UNIX) { |
272cd7a8 | 3647 | ssp = sock->sk->sk_security; |
2f823ff8 | 3648 | s = ssp->smk_out->smk_secid; |
b4e0d5f0 CS |
3649 | } else if (family == PF_INET || family == PF_INET6) { |
3650 | /* | |
3651 | * Translate what netlabel gave us. | |
3652 | */ | |
272cd7a8 CS |
3653 | if (sock != NULL && sock->sk != NULL) |
3654 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3655 | netlbl_secattr_init(&secattr); |
3656 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3657 | if (rc == 0) { | |
2f823ff8 CS |
3658 | skp = smack_from_secattr(&secattr, ssp); |
3659 | s = skp->smk_secid; | |
b4e0d5f0 CS |
3660 | } |
3661 | netlbl_secattr_destroy(&secattr); | |
3662 | } | |
3663 | *secid = s; | |
e114e473 CS |
3664 | if (s == 0) |
3665 | return -EINVAL; | |
e114e473 CS |
3666 | return 0; |
3667 | } | |
3668 | ||
3669 | /** | |
07feee8f PM |
3670 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3671 | * @sk: child sock | |
3672 | * @parent: parent socket | |
e114e473 | 3673 | * |
07feee8f PM |
3674 | * Set the smk_{in,out} state of an existing sock based on the process that |
3675 | * is creating the new socket. | |
e114e473 CS |
3676 | */ |
3677 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3678 | { | |
3679 | struct socket_smack *ssp; | |
2f823ff8 | 3680 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3681 | |
07feee8f PM |
3682 | if (sk == NULL || |
3683 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3684 | return; |
3685 | ||
3686 | ssp = sk->sk_security; | |
54e70ec5 | 3687 | ssp->smk_in = skp; |
2f823ff8 | 3688 | ssp->smk_out = skp; |
07feee8f | 3689 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3690 | } |
3691 | ||
3692 | /** | |
3693 | * smack_inet_conn_request - Smack access check on connect | |
3694 | * @sk: socket involved | |
3695 | * @skb: packet | |
3696 | * @req: unused | |
3697 | * | |
3698 | * Returns 0 if a task with the packet label could write to | |
3699 | * the socket, otherwise an error code | |
3700 | */ | |
3701 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3702 | struct request_sock *req) | |
3703 | { | |
07feee8f | 3704 | u16 family = sk->sk_family; |
f7112e6c | 3705 | struct smack_known *skp; |
e114e473 | 3706 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3707 | struct netlbl_lsm_secattr secattr; |
3708 | struct sockaddr_in addr; | |
3709 | struct iphdr *hdr; | |
21c7eae2 | 3710 | struct smack_known *hskp; |
e114e473 | 3711 | int rc; |
ecfcc53f | 3712 | struct smk_audit_info ad; |
923e9a13 | 3713 | #ifdef CONFIG_AUDIT |
48c62af6 | 3714 | struct lsm_network_audit net; |
923e9a13 | 3715 | #endif |
e114e473 | 3716 | |
c6739443 CS |
3717 | if (family == PF_INET6) { |
3718 | /* | |
3719 | * Handle mapped IPv4 packets arriving | |
3720 | * via IPv6 sockets. Don't set up netlabel | |
3721 | * processing on IPv6. | |
3722 | */ | |
3723 | if (skb->protocol == htons(ETH_P_IP)) | |
3724 | family = PF_INET; | |
3725 | else | |
3726 | return 0; | |
3727 | } | |
e114e473 | 3728 | |
07feee8f PM |
3729 | netlbl_secattr_init(&secattr); |
3730 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3731 | if (rc == 0) |
2f823ff8 | 3732 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3733 | else |
2f823ff8 | 3734 | skp = &smack_known_huh; |
07feee8f PM |
3735 | netlbl_secattr_destroy(&secattr); |
3736 | ||
ecfcc53f | 3737 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
3738 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
3739 | ad.a.u.net->family = family; | |
3740 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
3741 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3742 | #endif | |
e114e473 | 3743 | /* |
07feee8f PM |
3744 | * Receiving a packet requires that the other end be able to write |
3745 | * here. Read access is not required. | |
e114e473 | 3746 | */ |
21c7eae2 LP |
3747 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3748 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
3749 | if (rc != 0) |
3750 | return rc; | |
3751 | ||
3752 | /* | |
3753 | * Save the peer's label in the request_sock so we can later setup | |
3754 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3755 | */ | |
2f823ff8 | 3756 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
3757 | |
3758 | /* | |
3759 | * We need to decide if we want to label the incoming connection here | |
3760 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3761 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3762 | */ |
3763 | hdr = ip_hdr(skb); | |
3764 | addr.sin_addr.s_addr = hdr->saddr; | |
3765 | rcu_read_lock(); | |
21c7eae2 | 3766 | hskp = smack_host_label(&addr); |
f7112e6c CS |
3767 | rcu_read_unlock(); |
3768 | ||
21c7eae2 | 3769 | if (hskp == NULL) |
f7112e6c | 3770 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 3771 | else |
07feee8f | 3772 | netlbl_req_delattr(req); |
e114e473 CS |
3773 | |
3774 | return rc; | |
3775 | } | |
3776 | ||
07feee8f PM |
3777 | /** |
3778 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3779 | * @sk: the new socket | |
3780 | * @req: the connection's request_sock | |
3781 | * | |
3782 | * Transfer the connection's peer label to the newly created socket. | |
3783 | */ | |
3784 | static void smack_inet_csk_clone(struct sock *sk, | |
3785 | const struct request_sock *req) | |
3786 | { | |
3787 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 3788 | struct smack_known *skp; |
07feee8f | 3789 | |
2f823ff8 CS |
3790 | if (req->peer_secid != 0) { |
3791 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 3792 | ssp->smk_packet = skp; |
2f823ff8 | 3793 | } else |
272cd7a8 | 3794 | ssp->smk_packet = NULL; |
07feee8f PM |
3795 | } |
3796 | ||
e114e473 CS |
3797 | /* |
3798 | * Key management security hooks | |
3799 | * | |
3800 | * Casey has not tested key support very heavily. | |
3801 | * The permission check is most likely too restrictive. | |
3802 | * If you care about keys please have a look. | |
3803 | */ | |
3804 | #ifdef CONFIG_KEYS | |
3805 | ||
3806 | /** | |
3807 | * smack_key_alloc - Set the key security blob | |
3808 | * @key: object | |
d84f4f99 | 3809 | * @cred: the credentials to use |
e114e473 CS |
3810 | * @flags: unused |
3811 | * | |
3812 | * No allocation required | |
3813 | * | |
3814 | * Returns 0 | |
3815 | */ | |
d84f4f99 | 3816 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3817 | unsigned long flags) |
3818 | { | |
2f823ff8 CS |
3819 | struct smack_known *skp = smk_of_task(cred->security); |
3820 | ||
21c7eae2 | 3821 | key->security = skp; |
e114e473 CS |
3822 | return 0; |
3823 | } | |
3824 | ||
3825 | /** | |
3826 | * smack_key_free - Clear the key security blob | |
3827 | * @key: the object | |
3828 | * | |
3829 | * Clear the blob pointer | |
3830 | */ | |
3831 | static void smack_key_free(struct key *key) | |
3832 | { | |
3833 | key->security = NULL; | |
3834 | } | |
3835 | ||
3836 | /* | |
3837 | * smack_key_permission - Smack access on a key | |
3838 | * @key_ref: gets to the object | |
d84f4f99 | 3839 | * @cred: the credentials to use |
e114e473 CS |
3840 | * @perm: unused |
3841 | * | |
3842 | * Return 0 if the task has read and write to the object, | |
3843 | * an error code otherwise | |
3844 | */ | |
3845 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 3846 | const struct cred *cred, unsigned perm) |
e114e473 CS |
3847 | { |
3848 | struct key *keyp; | |
ecfcc53f | 3849 | struct smk_audit_info ad; |
2f823ff8 | 3850 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 3851 | int request = 0; |
d166c802 | 3852 | int rc; |
e114e473 CS |
3853 | |
3854 | keyp = key_ref_to_ptr(key_ref); | |
3855 | if (keyp == NULL) | |
3856 | return -EINVAL; | |
3857 | /* | |
3858 | * If the key hasn't been initialized give it access so that | |
3859 | * it may do so. | |
3860 | */ | |
3861 | if (keyp->security == NULL) | |
3862 | return 0; | |
3863 | /* | |
3864 | * This should not occur | |
3865 | */ | |
2f823ff8 | 3866 | if (tkp == NULL) |
e114e473 | 3867 | return -EACCES; |
ecfcc53f EB |
3868 | #ifdef CONFIG_AUDIT |
3869 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3870 | ad.a.u.key_struct.key = keyp->serial; | |
3871 | ad.a.u.key_struct.key_desc = keyp->description; | |
3872 | #endif | |
fffea214 DK |
3873 | if (perm & KEY_NEED_READ) |
3874 | request = MAY_READ; | |
3875 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
3876 | request = MAY_WRITE; | |
d166c802 CS |
3877 | rc = smk_access(tkp, keyp->security, request, &ad); |
3878 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
3879 | return rc; | |
e114e473 CS |
3880 | } |
3881 | #endif /* CONFIG_KEYS */ | |
3882 | ||
d20bdda6 AD |
3883 | /* |
3884 | * Smack Audit hooks | |
3885 | * | |
3886 | * Audit requires a unique representation of each Smack specific | |
3887 | * rule. This unique representation is used to distinguish the | |
3888 | * object to be audited from remaining kernel objects and also | |
3889 | * works as a glue between the audit hooks. | |
3890 | * | |
3891 | * Since repository entries are added but never deleted, we'll use | |
3892 | * the smack_known label address related to the given audit rule as | |
3893 | * the needed unique representation. This also better fits the smack | |
3894 | * model where nearly everything is a label. | |
3895 | */ | |
3896 | #ifdef CONFIG_AUDIT | |
3897 | ||
3898 | /** | |
3899 | * smack_audit_rule_init - Initialize a smack audit rule | |
3900 | * @field: audit rule fields given from user-space (audit.h) | |
3901 | * @op: required testing operator (=, !=, >, <, ...) | |
3902 | * @rulestr: smack label to be audited | |
3903 | * @vrule: pointer to save our own audit rule representation | |
3904 | * | |
3905 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3906 | * The label to be audited is created if necessay. | |
3907 | */ | |
3908 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3909 | { | |
21c7eae2 | 3910 | struct smack_known *skp; |
d20bdda6 AD |
3911 | char **rule = (char **)vrule; |
3912 | *rule = NULL; | |
3913 | ||
3914 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3915 | return -EINVAL; | |
3916 | ||
5af75d8d | 3917 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3918 | return -EINVAL; |
3919 | ||
21c7eae2 LP |
3920 | skp = smk_import_entry(rulestr, 0); |
3921 | if (skp) | |
3922 | *rule = skp->smk_known; | |
d20bdda6 AD |
3923 | |
3924 | return 0; | |
3925 | } | |
3926 | ||
3927 | /** | |
3928 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3929 | * @krule: rule of interest, in Audit kernel representation format | |
3930 | * | |
3931 | * This is used to filter Smack rules from remaining Audit ones. | |
3932 | * If it's proved that this rule belongs to us, the | |
3933 | * audit_rule_match hook will be called to do the final judgement. | |
3934 | */ | |
3935 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3936 | { | |
3937 | struct audit_field *f; | |
3938 | int i; | |
3939 | ||
3940 | for (i = 0; i < krule->field_count; i++) { | |
3941 | f = &krule->fields[i]; | |
3942 | ||
3943 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3944 | return 1; | |
3945 | } | |
3946 | ||
3947 | return 0; | |
3948 | } | |
3949 | ||
3950 | /** | |
3951 | * smack_audit_rule_match - Audit given object ? | |
3952 | * @secid: security id for identifying the object to test | |
3953 | * @field: audit rule flags given from user-space | |
3954 | * @op: required testing operator | |
3955 | * @vrule: smack internal rule presentation | |
3956 | * @actx: audit context associated with the check | |
3957 | * | |
3958 | * The core Audit hook. It's used to take the decision of | |
3959 | * whether to audit or not to audit a given object. | |
3960 | */ | |
3961 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3962 | struct audit_context *actx) | |
3963 | { | |
2f823ff8 | 3964 | struct smack_known *skp; |
d20bdda6 AD |
3965 | char *rule = vrule; |
3966 | ||
4eb0f4ab RGB |
3967 | if (unlikely(!rule)) { |
3968 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
3969 | return -ENOENT; |
3970 | } | |
3971 | ||
3972 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3973 | return 0; | |
3974 | ||
2f823ff8 | 3975 | skp = smack_from_secid(secid); |
d20bdda6 AD |
3976 | |
3977 | /* | |
3978 | * No need to do string comparisons. If a match occurs, | |
3979 | * both pointers will point to the same smack_known | |
3980 | * label. | |
3981 | */ | |
5af75d8d | 3982 | if (op == Audit_equal) |
2f823ff8 | 3983 | return (rule == skp->smk_known); |
5af75d8d | 3984 | if (op == Audit_not_equal) |
2f823ff8 | 3985 | return (rule != skp->smk_known); |
d20bdda6 AD |
3986 | |
3987 | return 0; | |
3988 | } | |
3989 | ||
3990 | /** | |
3991 | * smack_audit_rule_free - free smack rule representation | |
3992 | * @vrule: rule to be freed. | |
3993 | * | |
3994 | * No memory was allocated. | |
3995 | */ | |
3996 | static void smack_audit_rule_free(void *vrule) | |
3997 | { | |
3998 | /* No-op */ | |
3999 | } | |
4000 | ||
4001 | #endif /* CONFIG_AUDIT */ | |
4002 | ||
746df9b5 DQ |
4003 | /** |
4004 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4005 | * @name: Full xattr name to check. | |
4006 | */ | |
4007 | static int smack_ismaclabel(const char *name) | |
4008 | { | |
4009 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4010 | } | |
4011 | ||
4012 | ||
251a2a95 | 4013 | /** |
e114e473 CS |
4014 | * smack_secid_to_secctx - return the smack label for a secid |
4015 | * @secid: incoming integer | |
4016 | * @secdata: destination | |
4017 | * @seclen: how long it is | |
4018 | * | |
4019 | * Exists for networking code. | |
4020 | */ | |
4021 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4022 | { | |
2f823ff8 | 4023 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4024 | |
d5630b9d | 4025 | if (secdata) |
2f823ff8 CS |
4026 | *secdata = skp->smk_known; |
4027 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4028 | return 0; |
4029 | } | |
4030 | ||
251a2a95 | 4031 | /** |
4bc87e62 CS |
4032 | * smack_secctx_to_secid - return the secid for a smack label |
4033 | * @secdata: smack label | |
4034 | * @seclen: how long result is | |
4035 | * @secid: outgoing integer | |
4036 | * | |
4037 | * Exists for audit and networking code. | |
4038 | */ | |
e52c1764 | 4039 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4040 | { |
21c7eae2 LP |
4041 | struct smack_known *skp = smk_find_entry(secdata); |
4042 | ||
4043 | if (skp) | |
4044 | *secid = skp->smk_secid; | |
4045 | else | |
4046 | *secid = 0; | |
4bc87e62 CS |
4047 | return 0; |
4048 | } | |
4049 | ||
251a2a95 | 4050 | /** |
e114e473 | 4051 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
4052 | * @secdata: unused |
4053 | * @seclen: unused | |
e114e473 CS |
4054 | * |
4055 | * Exists to make sure nothing gets done, and properly | |
4056 | */ | |
4057 | static void smack_release_secctx(char *secdata, u32 seclen) | |
4058 | { | |
4059 | } | |
4060 | ||
1ee65e37 DQ |
4061 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4062 | { | |
4063 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4064 | } | |
4065 | ||
4066 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4067 | { | |
4068 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4069 | } | |
4070 | ||
4071 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4072 | { | |
4073 | int len = 0; | |
4074 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
4075 | ||
4076 | if (len < 0) | |
4077 | return len; | |
4078 | *ctxlen = len; | |
4079 | return 0; | |
4080 | } | |
4081 | ||
076c54c5 AD |
4082 | struct security_operations smack_ops = { |
4083 | .name = "smack", | |
4084 | ||
9e48858f | 4085 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 4086 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 4087 | .syslog = smack_syslog, |
e114e473 CS |
4088 | |
4089 | .sb_alloc_security = smack_sb_alloc_security, | |
4090 | .sb_free_security = smack_sb_free_security, | |
4091 | .sb_copy_data = smack_sb_copy_data, | |
4092 | .sb_kern_mount = smack_sb_kern_mount, | |
4093 | .sb_statfs = smack_sb_statfs, | |
e114e473 | 4094 | |
676dac4b | 4095 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
4096 | .bprm_committing_creds = smack_bprm_committing_creds, |
4097 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 4098 | |
e114e473 CS |
4099 | .inode_alloc_security = smack_inode_alloc_security, |
4100 | .inode_free_security = smack_inode_free_security, | |
4101 | .inode_init_security = smack_inode_init_security, | |
4102 | .inode_link = smack_inode_link, | |
4103 | .inode_unlink = smack_inode_unlink, | |
4104 | .inode_rmdir = smack_inode_rmdir, | |
4105 | .inode_rename = smack_inode_rename, | |
4106 | .inode_permission = smack_inode_permission, | |
4107 | .inode_setattr = smack_inode_setattr, | |
4108 | .inode_getattr = smack_inode_getattr, | |
4109 | .inode_setxattr = smack_inode_setxattr, | |
4110 | .inode_post_setxattr = smack_inode_post_setxattr, | |
4111 | .inode_getxattr = smack_inode_getxattr, | |
4112 | .inode_removexattr = smack_inode_removexattr, | |
4113 | .inode_getsecurity = smack_inode_getsecurity, | |
4114 | .inode_setsecurity = smack_inode_setsecurity, | |
4115 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 4116 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
4117 | |
4118 | .file_permission = smack_file_permission, | |
4119 | .file_alloc_security = smack_file_alloc_security, | |
4120 | .file_free_security = smack_file_free_security, | |
4121 | .file_ioctl = smack_file_ioctl, | |
4122 | .file_lock = smack_file_lock, | |
4123 | .file_fcntl = smack_file_fcntl, | |
e5467859 AV |
4124 | .mmap_file = smack_mmap_file, |
4125 | .mmap_addr = cap_mmap_addr, | |
e114e473 CS |
4126 | .file_set_fowner = smack_file_set_fowner, |
4127 | .file_send_sigiotask = smack_file_send_sigiotask, | |
4128 | .file_receive = smack_file_receive, | |
4129 | ||
83d49856 | 4130 | .file_open = smack_file_open, |
531f1d45 | 4131 | |
ee18d64c | 4132 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 4133 | .cred_free = smack_cred_free, |
d84f4f99 | 4134 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 4135 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
4136 | .kernel_act_as = smack_kernel_act_as, |
4137 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
4138 | .task_setpgid = smack_task_setpgid, |
4139 | .task_getpgid = smack_task_getpgid, | |
4140 | .task_getsid = smack_task_getsid, | |
4141 | .task_getsecid = smack_task_getsecid, | |
4142 | .task_setnice = smack_task_setnice, | |
4143 | .task_setioprio = smack_task_setioprio, | |
4144 | .task_getioprio = smack_task_getioprio, | |
4145 | .task_setscheduler = smack_task_setscheduler, | |
4146 | .task_getscheduler = smack_task_getscheduler, | |
4147 | .task_movememory = smack_task_movememory, | |
4148 | .task_kill = smack_task_kill, | |
4149 | .task_wait = smack_task_wait, | |
e114e473 CS |
4150 | .task_to_inode = smack_task_to_inode, |
4151 | ||
4152 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 4153 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
4154 | |
4155 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
4156 | .msg_msg_free_security = smack_msg_msg_free_security, | |
4157 | ||
4158 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
4159 | .msg_queue_free_security = smack_msg_queue_free_security, | |
4160 | .msg_queue_associate = smack_msg_queue_associate, | |
4161 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
4162 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
4163 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
4164 | ||
4165 | .shm_alloc_security = smack_shm_alloc_security, | |
4166 | .shm_free_security = smack_shm_free_security, | |
4167 | .shm_associate = smack_shm_associate, | |
4168 | .shm_shmctl = smack_shm_shmctl, | |
4169 | .shm_shmat = smack_shm_shmat, | |
4170 | ||
4171 | .sem_alloc_security = smack_sem_alloc_security, | |
4172 | .sem_free_security = smack_sem_free_security, | |
4173 | .sem_associate = smack_sem_associate, | |
4174 | .sem_semctl = smack_sem_semctl, | |
4175 | .sem_semop = smack_sem_semop, | |
4176 | ||
e114e473 CS |
4177 | .d_instantiate = smack_d_instantiate, |
4178 | ||
4179 | .getprocattr = smack_getprocattr, | |
4180 | .setprocattr = smack_setprocattr, | |
4181 | ||
4182 | .unix_stream_connect = smack_unix_stream_connect, | |
4183 | .unix_may_send = smack_unix_may_send, | |
4184 | ||
4185 | .socket_post_create = smack_socket_post_create, | |
c6739443 | 4186 | .socket_bind = smack_socket_bind, |
6d3dc07c CS |
4187 | .socket_connect = smack_socket_connect, |
4188 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
4189 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
4190 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
4191 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
4192 | .sk_alloc_security = smack_sk_alloc_security, | |
4193 | .sk_free_security = smack_sk_free_security, | |
4194 | .sock_graft = smack_sock_graft, | |
4195 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 4196 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 4197 | |
e114e473 CS |
4198 | /* key management security hooks */ |
4199 | #ifdef CONFIG_KEYS | |
4200 | .key_alloc = smack_key_alloc, | |
4201 | .key_free = smack_key_free, | |
4202 | .key_permission = smack_key_permission, | |
4203 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
4204 | |
4205 | /* Audit hooks */ | |
4206 | #ifdef CONFIG_AUDIT | |
4207 | .audit_rule_init = smack_audit_rule_init, | |
4208 | .audit_rule_known = smack_audit_rule_known, | |
4209 | .audit_rule_match = smack_audit_rule_match, | |
4210 | .audit_rule_free = smack_audit_rule_free, | |
4211 | #endif /* CONFIG_AUDIT */ | |
4212 | ||
746df9b5 | 4213 | .ismaclabel = smack_ismaclabel, |
e114e473 | 4214 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 4215 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 4216 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
4217 | .inode_notifysecctx = smack_inode_notifysecctx, |
4218 | .inode_setsecctx = smack_inode_setsecctx, | |
4219 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
4220 | }; |
4221 | ||
7198e2ee | 4222 | |
86812bb0 | 4223 | static __init void init_smack_known_list(void) |
7198e2ee | 4224 | { |
86812bb0 CS |
4225 | /* |
4226 | * Initialize rule list locks | |
4227 | */ | |
4228 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4229 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4230 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4231 | mutex_init(&smack_known_star.smk_rules_lock); | |
4232 | mutex_init(&smack_known_invalid.smk_rules_lock); | |
4233 | mutex_init(&smack_known_web.smk_rules_lock); | |
4234 | /* | |
4235 | * Initialize rule lists | |
4236 | */ | |
4237 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4238 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4239 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4240 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
4241 | INIT_LIST_HEAD(&smack_known_invalid.smk_rules); | |
4242 | INIT_LIST_HEAD(&smack_known_web.smk_rules); | |
4243 | /* | |
4244 | * Create the known labels list | |
4245 | */ | |
4d7cf4a1 TS |
4246 | smk_insert_entry(&smack_known_huh); |
4247 | smk_insert_entry(&smack_known_hat); | |
4248 | smk_insert_entry(&smack_known_star); | |
4249 | smk_insert_entry(&smack_known_floor); | |
4250 | smk_insert_entry(&smack_known_invalid); | |
4251 | smk_insert_entry(&smack_known_web); | |
7198e2ee EB |
4252 | } |
4253 | ||
e114e473 CS |
4254 | /** |
4255 | * smack_init - initialize the smack system | |
4256 | * | |
4257 | * Returns 0 | |
4258 | */ | |
4259 | static __init int smack_init(void) | |
4260 | { | |
d84f4f99 | 4261 | struct cred *cred; |
676dac4b | 4262 | struct task_smack *tsp; |
d84f4f99 | 4263 | |
7898e1f8 CS |
4264 | if (!security_module_enable(&smack_ops)) |
4265 | return 0; | |
4266 | ||
2f823ff8 CS |
4267 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4268 | GFP_KERNEL); | |
676dac4b CS |
4269 | if (tsp == NULL) |
4270 | return -ENOMEM; | |
4271 | ||
e114e473 CS |
4272 | printk(KERN_INFO "Smack: Initializing.\n"); |
4273 | ||
4274 | /* | |
4275 | * Set the security state for the initial task. | |
4276 | */ | |
d84f4f99 | 4277 | cred = (struct cred *) current->cred; |
676dac4b | 4278 | cred->security = tsp; |
e114e473 | 4279 | |
86812bb0 CS |
4280 | /* initialize the smack_known_list */ |
4281 | init_smack_known_list(); | |
e114e473 CS |
4282 | |
4283 | /* | |
4284 | * Register with LSM | |
4285 | */ | |
4286 | if (register_security(&smack_ops)) | |
4287 | panic("smack: Unable to register with kernel.\n"); | |
4288 | ||
4289 | return 0; | |
4290 | } | |
4291 | ||
4292 | /* | |
4293 | * Smack requires early initialization in order to label | |
4294 | * all processes and objects when they are created. | |
4295 | */ | |
4296 | security_initcall(smack_init); |