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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
5 | * All Rights Reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
22 | * | |
23 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
24 | * especially the idea of avoiding a copy by using getname. | |
25 | * | |
26 | * The method for actual interception of syscall entry and exit (not in | |
27 | * this file -- see entry.S) is based on a GPL'd patch written by | |
28 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <linux/init.h> | |
33 | #include <asm/atomic.h> | |
34 | #include <asm/types.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/module.h> | |
01116105 | 37 | #include <linux/mount.h> |
3ec3b2fb | 38 | #include <linux/socket.h> |
1da177e4 LT |
39 | #include <linux/audit.h> |
40 | #include <linux/personality.h> | |
41 | #include <linux/time.h> | |
f6a789d1 | 42 | #include <linux/kthread.h> |
5bb289b5 | 43 | #include <linux/netlink.h> |
f5561964 | 44 | #include <linux/compiler.h> |
1da177e4 LT |
45 | #include <asm/unistd.h> |
46 | ||
47 | /* 0 = no checking | |
48 | 1 = put_count checking | |
49 | 2 = verbose put_count checking | |
50 | */ | |
51 | #define AUDIT_DEBUG 0 | |
52 | ||
53 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
54 | extern int audit_enabled; | |
55 | ||
56 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
57 | * for saving names from getname(). */ | |
58 | #define AUDIT_NAMES 20 | |
59 | ||
60 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
61 | * audit_context from being used for nameless inodes from | |
62 | * path_lookup. */ | |
63 | #define AUDIT_NAMES_RESERVED 7 | |
64 | ||
65 | /* At task start time, the audit_state is set in the audit_context using | |
66 | a per-task filter. At syscall entry, the audit_state is augmented by | |
67 | the syscall filter. */ | |
68 | enum audit_state { | |
69 | AUDIT_DISABLED, /* Do not create per-task audit_context. | |
70 | * No syscall-specific audit records can | |
71 | * be generated. */ | |
72 | AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context, | |
73 | * but don't necessarily fill it in at | |
74 | * syscall entry time (i.e., filter | |
75 | * instead). */ | |
76 | AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, | |
77 | * and always fill it in at syscall | |
78 | * entry time. This makes a full | |
79 | * syscall record available if some | |
80 | * other part of the kernel decides it | |
81 | * should be recorded. */ | |
82 | AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, | |
83 | * always fill it in at syscall entry | |
84 | * time, and always write out the audit | |
85 | * record at syscall exit time. */ | |
86 | }; | |
87 | ||
88 | /* When fs/namei.c:getname() is called, we store the pointer in name and | |
89 | * we don't let putname() free it (instead we free all of the saved | |
90 | * pointers at syscall exit time). | |
91 | * | |
92 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
93 | struct audit_names { | |
94 | const char *name; | |
95 | unsigned long ino; | |
96 | dev_t dev; | |
97 | umode_t mode; | |
98 | uid_t uid; | |
99 | gid_t gid; | |
100 | dev_t rdev; | |
ae7b961b | 101 | unsigned flags; |
1da177e4 LT |
102 | }; |
103 | ||
104 | struct audit_aux_data { | |
105 | struct audit_aux_data *next; | |
106 | int type; | |
107 | }; | |
108 | ||
109 | #define AUDIT_AUX_IPCPERM 0 | |
110 | ||
111 | struct audit_aux_data_ipcctl { | |
112 | struct audit_aux_data d; | |
113 | struct ipc_perm p; | |
114 | unsigned long qbytes; | |
115 | uid_t uid; | |
116 | gid_t gid; | |
117 | mode_t mode; | |
118 | }; | |
119 | ||
3ec3b2fb DW |
120 | struct audit_aux_data_socketcall { |
121 | struct audit_aux_data d; | |
122 | int nargs; | |
123 | unsigned long args[0]; | |
124 | }; | |
125 | ||
126 | struct audit_aux_data_sockaddr { | |
127 | struct audit_aux_data d; | |
128 | int len; | |
129 | char a[0]; | |
130 | }; | |
131 | ||
01116105 SS |
132 | struct audit_aux_data_path { |
133 | struct audit_aux_data d; | |
134 | struct dentry *dentry; | |
135 | struct vfsmount *mnt; | |
136 | }; | |
1da177e4 LT |
137 | |
138 | /* The per-task audit context. */ | |
139 | struct audit_context { | |
140 | int in_syscall; /* 1 if task is in a syscall */ | |
141 | enum audit_state state; | |
142 | unsigned int serial; /* serial number for record */ | |
143 | struct timespec ctime; /* time of syscall entry */ | |
144 | uid_t loginuid; /* login uid (identity) */ | |
145 | int major; /* syscall number */ | |
146 | unsigned long argv[4]; /* syscall arguments */ | |
147 | int return_valid; /* return code is valid */ | |
2fd6f58b | 148 | long return_code;/* syscall return code */ |
1da177e4 LT |
149 | int auditable; /* 1 if record should be written */ |
150 | int name_count; | |
151 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
152 | struct dentry * pwd; |
153 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
154 | struct audit_context *previous; /* For nested syscalls */ |
155 | struct audit_aux_data *aux; | |
156 | ||
157 | /* Save things to print about task_struct */ | |
158 | pid_t pid; | |
159 | uid_t uid, euid, suid, fsuid; | |
160 | gid_t gid, egid, sgid, fsgid; | |
161 | unsigned long personality; | |
2fd6f58b | 162 | int arch; |
1da177e4 LT |
163 | |
164 | #if AUDIT_DEBUG | |
165 | int put_count; | |
166 | int ino_count; | |
167 | #endif | |
168 | }; | |
169 | ||
170 | /* Public API */ | |
171 | /* There are three lists of rules -- one to search at task creation | |
172 | * time, one to search at syscall entry time, and another to search at | |
173 | * syscall exit time. */ | |
0f45aa18 DW |
174 | static struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { |
175 | LIST_HEAD_INIT(audit_filter_list[0]), | |
176 | LIST_HEAD_INIT(audit_filter_list[1]), | |
177 | LIST_HEAD_INIT(audit_filter_list[2]), | |
178 | LIST_HEAD_INIT(audit_filter_list[3]), | |
179 | LIST_HEAD_INIT(audit_filter_list[4]), | |
180 | #if AUDIT_NR_FILTERS != 5 | |
181 | #error Fix audit_filter_list initialiser | |
182 | #endif | |
183 | }; | |
1da177e4 LT |
184 | |
185 | struct audit_entry { | |
186 | struct list_head list; | |
187 | struct rcu_head rcu; | |
188 | struct audit_rule rule; | |
189 | }; | |
190 | ||
7ca00264 DW |
191 | extern int audit_pid; |
192 | ||
1da177e4 LT |
193 | /* Check to see if two rules are identical. It is called from |
194 | * audit_del_rule during AUDIT_DEL. */ | |
195 | static int audit_compare_rule(struct audit_rule *a, struct audit_rule *b) | |
196 | { | |
197 | int i; | |
198 | ||
199 | if (a->flags != b->flags) | |
200 | return 1; | |
201 | ||
202 | if (a->action != b->action) | |
203 | return 1; | |
204 | ||
205 | if (a->field_count != b->field_count) | |
206 | return 1; | |
207 | ||
208 | for (i = 0; i < a->field_count; i++) { | |
209 | if (a->fields[i] != b->fields[i] | |
210 | || a->values[i] != b->values[i]) | |
211 | return 1; | |
212 | } | |
213 | ||
214 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) | |
215 | if (a->mask[i] != b->mask[i]) | |
216 | return 1; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | /* Note that audit_add_rule and audit_del_rule are called via | |
222 | * audit_receive() in audit.c, and are protected by | |
223 | * audit_netlink_sem. */ | |
0f45aa18 DW |
224 | static inline void audit_add_rule(struct audit_entry *entry, |
225 | struct list_head *list) | |
1da177e4 | 226 | { |
0f45aa18 DW |
227 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
228 | entry->rule.flags &= ~AUDIT_FILTER_PREPEND; | |
1da177e4 LT |
229 | list_add_rcu(&entry->list, list); |
230 | } else { | |
231 | list_add_tail_rcu(&entry->list, list); | |
232 | } | |
1da177e4 LT |
233 | } |
234 | ||
235 | static void audit_free_rule(struct rcu_head *head) | |
236 | { | |
237 | struct audit_entry *e = container_of(head, struct audit_entry, rcu); | |
238 | kfree(e); | |
239 | } | |
240 | ||
241 | /* Note that audit_add_rule and audit_del_rule are called via | |
242 | * audit_receive() in audit.c, and are protected by | |
243 | * audit_netlink_sem. */ | |
244 | static inline int audit_del_rule(struct audit_rule *rule, | |
245 | struct list_head *list) | |
246 | { | |
247 | struct audit_entry *e; | |
248 | ||
249 | /* Do not use the _rcu iterator here, since this is the only | |
250 | * deletion routine. */ | |
251 | list_for_each_entry(e, list, list) { | |
252 | if (!audit_compare_rule(rule, &e->rule)) { | |
253 | list_del_rcu(&e->list); | |
254 | call_rcu(&e->rcu, audit_free_rule); | |
255 | return 0; | |
256 | } | |
257 | } | |
0f45aa18 | 258 | return -ENOENT; /* No matching rule */ |
1da177e4 LT |
259 | } |
260 | ||
1da177e4 LT |
261 | /* Copy rule from user-space to kernel-space. Called during |
262 | * AUDIT_ADD. */ | |
263 | static int audit_copy_rule(struct audit_rule *d, struct audit_rule *s) | |
264 | { | |
265 | int i; | |
266 | ||
267 | if (s->action != AUDIT_NEVER | |
268 | && s->action != AUDIT_POSSIBLE | |
269 | && s->action != AUDIT_ALWAYS) | |
270 | return -1; | |
271 | if (s->field_count < 0 || s->field_count > AUDIT_MAX_FIELDS) | |
272 | return -1; | |
0f45aa18 DW |
273 | if ((s->flags & ~AUDIT_FILTER_PREPEND) >= AUDIT_NR_FILTERS) |
274 | return -1; | |
1da177e4 LT |
275 | |
276 | d->flags = s->flags; | |
277 | d->action = s->action; | |
278 | d->field_count = s->field_count; | |
279 | for (i = 0; i < d->field_count; i++) { | |
280 | d->fields[i] = s->fields[i]; | |
281 | d->values[i] = s->values[i]; | |
282 | } | |
283 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) d->mask[i] = s->mask[i]; | |
284 | return 0; | |
285 | } | |
286 | ||
f6a789d1 DW |
287 | static int audit_list_rules(void *_dest) |
288 | { | |
289 | int pid, seq; | |
290 | int *dest = _dest; | |
291 | struct audit_entry *entry; | |
292 | int i; | |
293 | ||
294 | pid = dest[0]; | |
295 | seq = dest[1]; | |
296 | kfree(dest); | |
297 | ||
298 | down(&audit_netlink_sem); | |
299 | ||
300 | /* The *_rcu iterators not needed here because we are | |
301 | always called with audit_netlink_sem held. */ | |
302 | for (i=0; i<AUDIT_NR_FILTERS; i++) { | |
303 | list_for_each_entry(entry, &audit_filter_list[i], list) | |
304 | audit_send_reply(pid, seq, AUDIT_LIST, 0, 1, | |
305 | &entry->rule, sizeof(entry->rule)); | |
306 | } | |
307 | audit_send_reply(pid, seq, AUDIT_LIST, 1, 1, NULL, 0); | |
308 | ||
309 | up(&audit_netlink_sem); | |
310 | return 0; | |
311 | } | |
312 | ||
c94c257c SH |
313 | int audit_receive_filter(int type, int pid, int uid, int seq, void *data, |
314 | uid_t loginuid) | |
1da177e4 | 315 | { |
1da177e4 | 316 | struct audit_entry *entry; |
f6a789d1 DW |
317 | struct task_struct *tsk; |
318 | int *dest; | |
1da177e4 | 319 | int err = 0; |
0f45aa18 | 320 | unsigned listnr; |
1da177e4 LT |
321 | |
322 | switch (type) { | |
323 | case AUDIT_LIST: | |
f6a789d1 DW |
324 | /* We can't just spew out the rules here because we might fill |
325 | * the available socket buffer space and deadlock waiting for | |
326 | * auditctl to read from it... which isn't ever going to | |
327 | * happen if we're actually running in the context of auditctl | |
328 | * trying to _send_ the stuff */ | |
329 | ||
330 | dest = kmalloc(2 * sizeof(int), GFP_KERNEL); | |
331 | if (!dest) | |
332 | return -ENOMEM; | |
333 | dest[0] = pid; | |
334 | dest[1] = seq; | |
335 | ||
336 | tsk = kthread_run(audit_list_rules, dest, "audit_list_rules"); | |
337 | if (IS_ERR(tsk)) { | |
338 | kfree(dest); | |
339 | err = PTR_ERR(tsk); | |
0f45aa18 | 340 | } |
1da177e4 LT |
341 | break; |
342 | case AUDIT_ADD: | |
343 | if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL))) | |
344 | return -ENOMEM; | |
345 | if (audit_copy_rule(&entry->rule, data)) { | |
346 | kfree(entry); | |
347 | return -EINVAL; | |
348 | } | |
0f45aa18 DW |
349 | listnr = entry->rule.flags & ~AUDIT_FILTER_PREPEND; |
350 | audit_add_rule(entry, &audit_filter_list[listnr]); | |
9ad9ad38 | 351 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
bccf6ae0 | 352 | "auid=%u added an audit rule\n", loginuid); |
1da177e4 LT |
353 | break; |
354 | case AUDIT_DEL: | |
0f45aa18 DW |
355 | listnr =((struct audit_rule *)data)->flags & ~AUDIT_FILTER_PREPEND; |
356 | if (listnr >= AUDIT_NR_FILTERS) | |
357 | return -EINVAL; | |
358 | ||
359 | err = audit_del_rule(data, &audit_filter_list[listnr]); | |
360 | if (!err) | |
9ad9ad38 | 361 | audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE, |
0f45aa18 | 362 | "auid=%u removed an audit rule\n", loginuid); |
1da177e4 LT |
363 | break; |
364 | default: | |
365 | return -EINVAL; | |
366 | } | |
367 | ||
368 | return err; | |
369 | } | |
1da177e4 LT |
370 | |
371 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 | |
372 | * otherwise. */ | |
373 | static int audit_filter_rules(struct task_struct *tsk, | |
374 | struct audit_rule *rule, | |
375 | struct audit_context *ctx, | |
376 | enum audit_state *state) | |
377 | { | |
378 | int i, j; | |
379 | ||
380 | for (i = 0; i < rule->field_count; i++) { | |
381 | u32 field = rule->fields[i] & ~AUDIT_NEGATE; | |
382 | u32 value = rule->values[i]; | |
383 | int result = 0; | |
384 | ||
385 | switch (field) { | |
386 | case AUDIT_PID: | |
387 | result = (tsk->pid == value); | |
388 | break; | |
389 | case AUDIT_UID: | |
390 | result = (tsk->uid == value); | |
391 | break; | |
392 | case AUDIT_EUID: | |
393 | result = (tsk->euid == value); | |
394 | break; | |
395 | case AUDIT_SUID: | |
396 | result = (tsk->suid == value); | |
397 | break; | |
398 | case AUDIT_FSUID: | |
399 | result = (tsk->fsuid == value); | |
400 | break; | |
401 | case AUDIT_GID: | |
402 | result = (tsk->gid == value); | |
403 | break; | |
404 | case AUDIT_EGID: | |
405 | result = (tsk->egid == value); | |
406 | break; | |
407 | case AUDIT_SGID: | |
408 | result = (tsk->sgid == value); | |
409 | break; | |
410 | case AUDIT_FSGID: | |
411 | result = (tsk->fsgid == value); | |
412 | break; | |
413 | case AUDIT_PERS: | |
414 | result = (tsk->personality == value); | |
415 | break; | |
2fd6f58b DW |
416 | case AUDIT_ARCH: |
417 | if (ctx) | |
418 | result = (ctx->arch == value); | |
419 | break; | |
1da177e4 LT |
420 | |
421 | case AUDIT_EXIT: | |
422 | if (ctx && ctx->return_valid) | |
423 | result = (ctx->return_code == value); | |
424 | break; | |
425 | case AUDIT_SUCCESS: | |
426 | if (ctx && ctx->return_valid) | |
2fd6f58b | 427 | result = (ctx->return_valid == AUDITSC_SUCCESS); |
1da177e4 LT |
428 | break; |
429 | case AUDIT_DEVMAJOR: | |
430 | if (ctx) { | |
431 | for (j = 0; j < ctx->name_count; j++) { | |
432 | if (MAJOR(ctx->names[j].dev)==value) { | |
433 | ++result; | |
434 | break; | |
435 | } | |
436 | } | |
437 | } | |
438 | break; | |
439 | case AUDIT_DEVMINOR: | |
440 | if (ctx) { | |
441 | for (j = 0; j < ctx->name_count; j++) { | |
442 | if (MINOR(ctx->names[j].dev)==value) { | |
443 | ++result; | |
444 | break; | |
445 | } | |
446 | } | |
447 | } | |
448 | break; | |
449 | case AUDIT_INODE: | |
450 | if (ctx) { | |
451 | for (j = 0; j < ctx->name_count; j++) { | |
452 | if (ctx->names[j].ino == value) { | |
453 | ++result; | |
454 | break; | |
455 | } | |
456 | } | |
457 | } | |
458 | break; | |
459 | case AUDIT_LOGINUID: | |
460 | result = 0; | |
461 | if (ctx) | |
462 | result = (ctx->loginuid == value); | |
463 | break; | |
464 | case AUDIT_ARG0: | |
465 | case AUDIT_ARG1: | |
466 | case AUDIT_ARG2: | |
467 | case AUDIT_ARG3: | |
468 | if (ctx) | |
469 | result = (ctx->argv[field-AUDIT_ARG0]==value); | |
470 | break; | |
471 | } | |
472 | ||
473 | if (rule->fields[i] & AUDIT_NEGATE) | |
474 | result = !result; | |
475 | if (!result) | |
476 | return 0; | |
477 | } | |
478 | switch (rule->action) { | |
479 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
480 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
481 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
482 | } | |
483 | return 1; | |
484 | } | |
485 | ||
486 | /* At process creation time, we can determine if system-call auditing is | |
487 | * completely disabled for this task. Since we only have the task | |
488 | * structure at this point, we can only check uid and gid. | |
489 | */ | |
490 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
491 | { | |
492 | struct audit_entry *e; | |
493 | enum audit_state state; | |
494 | ||
495 | rcu_read_lock(); | |
0f45aa18 | 496 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
1da177e4 LT |
497 | if (audit_filter_rules(tsk, &e->rule, NULL, &state)) { |
498 | rcu_read_unlock(); | |
499 | return state; | |
500 | } | |
501 | } | |
502 | rcu_read_unlock(); | |
503 | return AUDIT_BUILD_CONTEXT; | |
504 | } | |
505 | ||
506 | /* At syscall entry and exit time, this filter is called if the | |
507 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 508 | * also not high enough that we already know we have to write an audit |
1da177e4 LT |
509 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
510 | */ | |
511 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
512 | struct audit_context *ctx, | |
513 | struct list_head *list) | |
514 | { | |
515 | struct audit_entry *e; | |
c3896495 | 516 | enum audit_state state; |
1da177e4 | 517 | |
351bb722 | 518 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
519 | return AUDIT_DISABLED; |
520 | ||
1da177e4 | 521 | rcu_read_lock(); |
c3896495 DW |
522 | if (!list_empty(list)) { |
523 | int word = AUDIT_WORD(ctx->major); | |
524 | int bit = AUDIT_BIT(ctx->major); | |
525 | ||
526 | list_for_each_entry_rcu(e, list, list) { | |
527 | if ((e->rule.mask[word] & bit) == bit | |
528 | && audit_filter_rules(tsk, &e->rule, ctx, &state)) { | |
529 | rcu_read_unlock(); | |
530 | return state; | |
531 | } | |
532 | } | |
1da177e4 LT |
533 | } |
534 | rcu_read_unlock(); | |
535 | return AUDIT_BUILD_CONTEXT; | |
536 | } | |
537 | ||
5bb289b5 DW |
538 | static int audit_filter_user_rules(struct netlink_skb_parms *cb, |
539 | struct audit_rule *rule, | |
540 | enum audit_state *state) | |
541 | { | |
542 | int i; | |
543 | ||
544 | for (i = 0; i < rule->field_count; i++) { | |
545 | u32 field = rule->fields[i] & ~AUDIT_NEGATE; | |
546 | u32 value = rule->values[i]; | |
547 | int result = 0; | |
548 | ||
549 | switch (field) { | |
550 | case AUDIT_PID: | |
551 | result = (cb->creds.pid == value); | |
552 | break; | |
553 | case AUDIT_UID: | |
554 | result = (cb->creds.uid == value); | |
555 | break; | |
556 | case AUDIT_GID: | |
557 | result = (cb->creds.gid == value); | |
558 | break; | |
559 | case AUDIT_LOGINUID: | |
560 | result = (cb->loginuid == value); | |
561 | break; | |
562 | } | |
563 | ||
564 | if (rule->fields[i] & AUDIT_NEGATE) | |
565 | result = !result; | |
566 | if (!result) | |
567 | return 0; | |
568 | } | |
569 | switch (rule->action) { | |
570 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
571 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
572 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
573 | } | |
574 | return 1; | |
575 | } | |
576 | ||
577 | int audit_filter_user(struct netlink_skb_parms *cb, int type) | |
0f45aa18 DW |
578 | { |
579 | struct audit_entry *e; | |
580 | enum audit_state state; | |
4a4cd633 | 581 | int ret = 1; |
0f45aa18 DW |
582 | |
583 | rcu_read_lock(); | |
584 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { | |
5bb289b5 | 585 | if (audit_filter_user_rules(cb, &e->rule, &state)) { |
4a4cd633 DW |
586 | if (state == AUDIT_DISABLED) |
587 | ret = 0; | |
588 | break; | |
0f45aa18 DW |
589 | } |
590 | } | |
591 | rcu_read_unlock(); | |
4a4cd633 | 592 | |
993e2d41 | 593 | return ret; /* Audit by default */ |
0f45aa18 DW |
594 | } |
595 | ||
1da177e4 LT |
596 | /* This should be called with task_lock() held. */ |
597 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, | |
598 | int return_valid, | |
599 | int return_code) | |
600 | { | |
601 | struct audit_context *context = tsk->audit_context; | |
602 | ||
603 | if (likely(!context)) | |
604 | return NULL; | |
605 | context->return_valid = return_valid; | |
606 | context->return_code = return_code; | |
607 | ||
21af6c4f | 608 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 609 | enum audit_state state; |
0f45aa18 | 610 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
1da177e4 LT |
611 | if (state == AUDIT_RECORD_CONTEXT) |
612 | context->auditable = 1; | |
613 | } | |
614 | ||
615 | context->pid = tsk->pid; | |
616 | context->uid = tsk->uid; | |
617 | context->gid = tsk->gid; | |
618 | context->euid = tsk->euid; | |
619 | context->suid = tsk->suid; | |
620 | context->fsuid = tsk->fsuid; | |
621 | context->egid = tsk->egid; | |
622 | context->sgid = tsk->sgid; | |
623 | context->fsgid = tsk->fsgid; | |
624 | context->personality = tsk->personality; | |
625 | tsk->audit_context = NULL; | |
626 | return context; | |
627 | } | |
628 | ||
629 | static inline void audit_free_names(struct audit_context *context) | |
630 | { | |
631 | int i; | |
632 | ||
633 | #if AUDIT_DEBUG == 2 | |
634 | if (context->auditable | |
635 | ||context->put_count + context->ino_count != context->name_count) { | |
636 | printk(KERN_ERR "audit.c:%d(:%d): major=%d in_syscall=%d" | |
637 | " name_count=%d put_count=%d" | |
638 | " ino_count=%d [NOT freeing]\n", | |
639 | __LINE__, | |
640 | context->serial, context->major, context->in_syscall, | |
641 | context->name_count, context->put_count, | |
642 | context->ino_count); | |
643 | for (i = 0; i < context->name_count; i++) | |
644 | printk(KERN_ERR "names[%d] = %p = %s\n", i, | |
645 | context->names[i].name, | |
646 | context->names[i].name); | |
647 | dump_stack(); | |
648 | return; | |
649 | } | |
650 | #endif | |
651 | #if AUDIT_DEBUG | |
652 | context->put_count = 0; | |
653 | context->ino_count = 0; | |
654 | #endif | |
655 | ||
656 | for (i = 0; i < context->name_count; i++) | |
657 | if (context->names[i].name) | |
658 | __putname(context->names[i].name); | |
659 | context->name_count = 0; | |
8f37d47c DW |
660 | if (context->pwd) |
661 | dput(context->pwd); | |
662 | if (context->pwdmnt) | |
663 | mntput(context->pwdmnt); | |
664 | context->pwd = NULL; | |
665 | context->pwdmnt = NULL; | |
1da177e4 LT |
666 | } |
667 | ||
668 | static inline void audit_free_aux(struct audit_context *context) | |
669 | { | |
670 | struct audit_aux_data *aux; | |
671 | ||
672 | while ((aux = context->aux)) { | |
01116105 SS |
673 | if (aux->type == AUDIT_AVC_PATH) { |
674 | struct audit_aux_data_path *axi = (void *)aux; | |
675 | dput(axi->dentry); | |
676 | mntput(axi->mnt); | |
677 | } | |
1da177e4 LT |
678 | context->aux = aux->next; |
679 | kfree(aux); | |
680 | } | |
681 | } | |
682 | ||
683 | static inline void audit_zero_context(struct audit_context *context, | |
684 | enum audit_state state) | |
685 | { | |
686 | uid_t loginuid = context->loginuid; | |
687 | ||
688 | memset(context, 0, sizeof(*context)); | |
689 | context->state = state; | |
690 | context->loginuid = loginuid; | |
691 | } | |
692 | ||
693 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
694 | { | |
695 | struct audit_context *context; | |
696 | ||
697 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
698 | return NULL; | |
699 | audit_zero_context(context, state); | |
700 | return context; | |
701 | } | |
702 | ||
703 | /* Filter on the task information and allocate a per-task audit context | |
704 | * if necessary. Doing so turns on system call auditing for the | |
705 | * specified task. This is called from copy_process, so no lock is | |
706 | * needed. */ | |
707 | int audit_alloc(struct task_struct *tsk) | |
708 | { | |
709 | struct audit_context *context; | |
710 | enum audit_state state; | |
711 | ||
712 | if (likely(!audit_enabled)) | |
713 | return 0; /* Return if not auditing. */ | |
714 | ||
715 | state = audit_filter_task(tsk); | |
716 | if (likely(state == AUDIT_DISABLED)) | |
717 | return 0; | |
718 | ||
719 | if (!(context = audit_alloc_context(state))) { | |
720 | audit_log_lost("out of memory in audit_alloc"); | |
721 | return -ENOMEM; | |
722 | } | |
723 | ||
724 | /* Preserve login uid */ | |
725 | context->loginuid = -1; | |
726 | if (current->audit_context) | |
727 | context->loginuid = current->audit_context->loginuid; | |
728 | ||
729 | tsk->audit_context = context; | |
730 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static inline void audit_free_context(struct audit_context *context) | |
735 | { | |
736 | struct audit_context *previous; | |
737 | int count = 0; | |
738 | ||
739 | do { | |
740 | previous = context->previous; | |
741 | if (previous || (count && count < 10)) { | |
742 | ++count; | |
743 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
744 | " freeing multiple contexts (%d)\n", | |
745 | context->serial, context->major, | |
746 | context->name_count, count); | |
747 | } | |
748 | audit_free_names(context); | |
749 | audit_free_aux(context); | |
750 | kfree(context); | |
751 | context = previous; | |
752 | } while (context); | |
753 | if (count >= 10) | |
754 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
755 | } | |
756 | ||
219f0817 SS |
757 | static void audit_log_task_info(struct audit_buffer *ab) |
758 | { | |
759 | char name[sizeof(current->comm)]; | |
760 | struct mm_struct *mm = current->mm; | |
761 | struct vm_area_struct *vma; | |
762 | ||
763 | get_task_comm(name, current); | |
99e45eea DW |
764 | audit_log_format(ab, " comm="); |
765 | audit_log_untrustedstring(ab, name); | |
219f0817 SS |
766 | |
767 | if (!mm) | |
768 | return; | |
769 | ||
770 | down_read(&mm->mmap_sem); | |
771 | vma = mm->mmap; | |
772 | while (vma) { | |
773 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
774 | vma->vm_file) { | |
775 | audit_log_d_path(ab, "exe=", | |
776 | vma->vm_file->f_dentry, | |
777 | vma->vm_file->f_vfsmnt); | |
778 | break; | |
779 | } | |
780 | vma = vma->vm_next; | |
781 | } | |
782 | up_read(&mm->mmap_sem); | |
783 | } | |
784 | ||
f5561964 | 785 | static void audit_log_exit(struct audit_context *context, unsigned int gfp_mask) |
1da177e4 LT |
786 | { |
787 | int i; | |
788 | struct audit_buffer *ab; | |
7551ced3 | 789 | struct audit_aux_data *aux; |
1da177e4 | 790 | |
f5561964 | 791 | ab = audit_log_start(context, gfp_mask, AUDIT_SYSCALL); |
1da177e4 LT |
792 | if (!ab) |
793 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
794 | audit_log_format(ab, "arch=%x syscall=%d", |
795 | context->arch, context->major); | |
1da177e4 LT |
796 | if (context->personality != PER_LINUX) |
797 | audit_log_format(ab, " per=%lx", context->personality); | |
798 | if (context->return_valid) | |
2fd6f58b DW |
799 | audit_log_format(ab, " success=%s exit=%ld", |
800 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
801 | context->return_code); | |
1da177e4 LT |
802 | audit_log_format(ab, |
803 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
326e9c8b SG |
804 | " pid=%d auid=%u uid=%u gid=%u" |
805 | " euid=%u suid=%u fsuid=%u" | |
806 | " egid=%u sgid=%u fsgid=%u", | |
1da177e4 LT |
807 | context->argv[0], |
808 | context->argv[1], | |
809 | context->argv[2], | |
810 | context->argv[3], | |
811 | context->name_count, | |
812 | context->pid, | |
813 | context->loginuid, | |
814 | context->uid, | |
815 | context->gid, | |
816 | context->euid, context->suid, context->fsuid, | |
817 | context->egid, context->sgid, context->fsgid); | |
219f0817 | 818 | audit_log_task_info(ab); |
1da177e4 | 819 | audit_log_end(ab); |
1da177e4 | 820 | |
7551ced3 | 821 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 822 | |
9ad9ad38 | 823 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
824 | if (!ab) |
825 | continue; /* audit_panic has been called */ | |
826 | ||
1da177e4 | 827 | switch (aux->type) { |
c0404993 | 828 | case AUDIT_IPC: { |
1da177e4 LT |
829 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
830 | audit_log_format(ab, | |
326e9c8b | 831 | " qbytes=%lx iuid=%u igid=%u mode=%x", |
1da177e4 | 832 | axi->qbytes, axi->uid, axi->gid, axi->mode); |
3ec3b2fb DW |
833 | break; } |
834 | ||
835 | case AUDIT_SOCKETCALL: { | |
836 | int i; | |
837 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
838 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
839 | for (i=0; i<axs->nargs; i++) | |
840 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
841 | break; } | |
842 | ||
843 | case AUDIT_SOCKADDR: { | |
844 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
845 | ||
846 | audit_log_format(ab, "saddr="); | |
847 | audit_log_hex(ab, axs->a, axs->len); | |
848 | break; } | |
01116105 SS |
849 | |
850 | case AUDIT_AVC_PATH: { | |
851 | struct audit_aux_data_path *axi = (void *)aux; | |
852 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
853 | break; } |
854 | ||
1da177e4 LT |
855 | } |
856 | audit_log_end(ab); | |
1da177e4 LT |
857 | } |
858 | ||
8f37d47c | 859 | if (context->pwd && context->pwdmnt) { |
9ad9ad38 | 860 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
861 | if (ab) { |
862 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
863 | audit_log_end(ab); | |
864 | } | |
865 | } | |
1da177e4 | 866 | for (i = 0; i < context->name_count; i++) { |
9ad9ad38 | 867 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
868 | if (!ab) |
869 | continue; /* audit_panic has been called */ | |
8f37d47c | 870 | |
1da177e4 | 871 | audit_log_format(ab, "item=%d", i); |
83c7d091 DW |
872 | if (context->names[i].name) { |
873 | audit_log_format(ab, " name="); | |
874 | audit_log_untrustedstring(ab, context->names[i].name); | |
875 | } | |
ae7b961b DW |
876 | audit_log_format(ab, " flags=%x\n", context->names[i].flags); |
877 | ||
1da177e4 LT |
878 | if (context->names[i].ino != (unsigned long)-1) |
879 | audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#o" | |
326e9c8b | 880 | " ouid=%u ogid=%u rdev=%02x:%02x", |
1da177e4 LT |
881 | context->names[i].ino, |
882 | MAJOR(context->names[i].dev), | |
883 | MINOR(context->names[i].dev), | |
884 | context->names[i].mode, | |
885 | context->names[i].uid, | |
886 | context->names[i].gid, | |
887 | MAJOR(context->names[i].rdev), | |
888 | MINOR(context->names[i].rdev)); | |
889 | audit_log_end(ab); | |
890 | } | |
891 | } | |
892 | ||
893 | /* Free a per-task audit context. Called from copy_process and | |
894 | * __put_task_struct. */ | |
895 | void audit_free(struct task_struct *tsk) | |
896 | { | |
897 | struct audit_context *context; | |
898 | ||
899 | task_lock(tsk); | |
900 | context = audit_get_context(tsk, 0, 0); | |
901 | task_unlock(tsk); | |
902 | ||
903 | if (likely(!context)) | |
904 | return; | |
905 | ||
906 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
907 | * function (e.g., exit_group), then free context block. |
908 | * We use GFP_ATOMIC here because we might be doing this | |
909 | * in the context of the idle thread */ | |
f7056d64 | 910 | if (context->in_syscall && context->auditable) |
f5561964 | 911 | audit_log_exit(context, GFP_ATOMIC); |
1da177e4 LT |
912 | |
913 | audit_free_context(context); | |
914 | } | |
915 | ||
1da177e4 LT |
916 | /* Fill in audit context at syscall entry. This only happens if the |
917 | * audit context was created when the task was created and the state or | |
918 | * filters demand the audit context be built. If the state from the | |
919 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
920 | * then the record will be written at syscall exit time (otherwise, it | |
921 | * will only be written if another part of the kernel requests that it | |
922 | * be written). */ | |
2fd6f58b | 923 | void audit_syscall_entry(struct task_struct *tsk, int arch, int major, |
1da177e4 LT |
924 | unsigned long a1, unsigned long a2, |
925 | unsigned long a3, unsigned long a4) | |
926 | { | |
927 | struct audit_context *context = tsk->audit_context; | |
928 | enum audit_state state; | |
929 | ||
930 | BUG_ON(!context); | |
931 | ||
932 | /* This happens only on certain architectures that make system | |
933 | * calls in kernel_thread via the entry.S interface, instead of | |
934 | * with direct calls. (If you are porting to a new | |
935 | * architecture, hitting this condition can indicate that you | |
936 | * got the _exit/_leave calls backward in entry.S.) | |
937 | * | |
938 | * i386 no | |
939 | * x86_64 no | |
940 | * ppc64 yes (see arch/ppc64/kernel/misc.S) | |
941 | * | |
942 | * This also happens with vm86 emulation in a non-nested manner | |
943 | * (entries without exits), so this case must be caught. | |
944 | */ | |
945 | if (context->in_syscall) { | |
946 | struct audit_context *newctx; | |
947 | ||
948 | #if defined(__NR_vm86) && defined(__NR_vm86old) | |
949 | /* vm86 mode should only be entered once */ | |
950 | if (major == __NR_vm86 || major == __NR_vm86old) | |
951 | return; | |
952 | #endif | |
953 | #if AUDIT_DEBUG | |
954 | printk(KERN_ERR | |
955 | "audit(:%d) pid=%d in syscall=%d;" | |
956 | " entering syscall=%d\n", | |
957 | context->serial, tsk->pid, context->major, major); | |
958 | #endif | |
959 | newctx = audit_alloc_context(context->state); | |
960 | if (newctx) { | |
961 | newctx->previous = context; | |
962 | context = newctx; | |
963 | tsk->audit_context = newctx; | |
964 | } else { | |
965 | /* If we can't alloc a new context, the best we | |
966 | * can do is to leak memory (any pending putname | |
967 | * will be lost). The only other alternative is | |
968 | * to abandon auditing. */ | |
969 | audit_zero_context(context, context->state); | |
970 | } | |
971 | } | |
972 | BUG_ON(context->in_syscall || context->name_count); | |
973 | ||
974 | if (!audit_enabled) | |
975 | return; | |
976 | ||
2fd6f58b | 977 | context->arch = arch; |
1da177e4 LT |
978 | context->major = major; |
979 | context->argv[0] = a1; | |
980 | context->argv[1] = a2; | |
981 | context->argv[2] = a3; | |
982 | context->argv[3] = a4; | |
983 | ||
984 | state = context->state; | |
985 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 986 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
987 | if (likely(state == AUDIT_DISABLED)) |
988 | return; | |
989 | ||
ce625a80 | 990 | context->serial = 0; |
1da177e4 LT |
991 | context->ctime = CURRENT_TIME; |
992 | context->in_syscall = 1; | |
993 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
994 | } | |
995 | ||
996 | /* Tear down after system call. If the audit context has been marked as | |
997 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from | |
998 | * filtering, or because some other part of the kernel write an audit | |
999 | * message), then write out the syscall information. In call cases, | |
1000 | * free the names stored from getname(). */ | |
2fd6f58b | 1001 | void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code) |
1da177e4 LT |
1002 | { |
1003 | struct audit_context *context; | |
1004 | ||
1005 | get_task_struct(tsk); | |
1006 | task_lock(tsk); | |
2fd6f58b | 1007 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 LT |
1008 | task_unlock(tsk); |
1009 | ||
1010 | /* Not having a context here is ok, since the parent may have | |
1011 | * called __put_task_struct. */ | |
1012 | if (likely(!context)) | |
413a1c75 | 1013 | goto out; |
1da177e4 | 1014 | |
f7056d64 | 1015 | if (context->in_syscall && context->auditable) |
f5561964 | 1016 | audit_log_exit(context, GFP_KERNEL); |
1da177e4 LT |
1017 | |
1018 | context->in_syscall = 0; | |
1019 | context->auditable = 0; | |
2fd6f58b | 1020 | |
1da177e4 LT |
1021 | if (context->previous) { |
1022 | struct audit_context *new_context = context->previous; | |
1023 | context->previous = NULL; | |
1024 | audit_free_context(context); | |
1025 | tsk->audit_context = new_context; | |
1026 | } else { | |
1027 | audit_free_names(context); | |
1028 | audit_free_aux(context); | |
1da177e4 LT |
1029 | tsk->audit_context = context; |
1030 | } | |
413a1c75 | 1031 | out: |
1da177e4 LT |
1032 | put_task_struct(tsk); |
1033 | } | |
1034 | ||
1035 | /* Add a name to the list. Called from fs/namei.c:getname(). */ | |
1036 | void audit_getname(const char *name) | |
1037 | { | |
1038 | struct audit_context *context = current->audit_context; | |
1039 | ||
1040 | if (!context || IS_ERR(name) || !name) | |
1041 | return; | |
1042 | ||
1043 | if (!context->in_syscall) { | |
1044 | #if AUDIT_DEBUG == 2 | |
1045 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
1046 | __FILE__, __LINE__, context->serial, name); | |
1047 | dump_stack(); | |
1048 | #endif | |
1049 | return; | |
1050 | } | |
1051 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
1052 | context->names[context->name_count].name = name; | |
1053 | context->names[context->name_count].ino = (unsigned long)-1; | |
1054 | ++context->name_count; | |
8f37d47c DW |
1055 | if (!context->pwd) { |
1056 | read_lock(¤t->fs->lock); | |
1057 | context->pwd = dget(current->fs->pwd); | |
1058 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
1059 | read_unlock(¤t->fs->lock); | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | } |
1063 | ||
1064 | /* Intercept a putname request. Called from | |
1065 | * include/linux/fs.h:putname(). If we have stored the name from | |
1066 | * getname in the audit context, then we delay the putname until syscall | |
1067 | * exit. */ | |
1068 | void audit_putname(const char *name) | |
1069 | { | |
1070 | struct audit_context *context = current->audit_context; | |
1071 | ||
1072 | BUG_ON(!context); | |
1073 | if (!context->in_syscall) { | |
1074 | #if AUDIT_DEBUG == 2 | |
1075 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
1076 | __FILE__, __LINE__, context->serial, name); | |
1077 | if (context->name_count) { | |
1078 | int i; | |
1079 | for (i = 0; i < context->name_count; i++) | |
1080 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
1081 | context->names[i].name, | |
1082 | context->names[i].name); | |
1083 | } | |
1084 | #endif | |
1085 | __putname(name); | |
1086 | } | |
1087 | #if AUDIT_DEBUG | |
1088 | else { | |
1089 | ++context->put_count; | |
1090 | if (context->put_count > context->name_count) { | |
1091 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
1092 | " in_syscall=%d putname(%p) name_count=%d" | |
1093 | " put_count=%d\n", | |
1094 | __FILE__, __LINE__, | |
1095 | context->serial, context->major, | |
1096 | context->in_syscall, name, context->name_count, | |
1097 | context->put_count); | |
1098 | dump_stack(); | |
1099 | } | |
1100 | } | |
1101 | #endif | |
1102 | } | |
1103 | ||
1104 | /* Store the inode and device from a lookup. Called from | |
1105 | * fs/namei.c:path_lookup(). */ | |
ae7b961b | 1106 | void audit_inode(const char *name, const struct inode *inode, unsigned flags) |
1da177e4 LT |
1107 | { |
1108 | int idx; | |
1109 | struct audit_context *context = current->audit_context; | |
1110 | ||
1111 | if (!context->in_syscall) | |
1112 | return; | |
1113 | if (context->name_count | |
1114 | && context->names[context->name_count-1].name | |
1115 | && context->names[context->name_count-1].name == name) | |
1116 | idx = context->name_count - 1; | |
1117 | else if (context->name_count > 1 | |
1118 | && context->names[context->name_count-2].name | |
1119 | && context->names[context->name_count-2].name == name) | |
1120 | idx = context->name_count - 2; | |
1121 | else { | |
1122 | /* FIXME: how much do we care about inodes that have no | |
1123 | * associated name? */ | |
1124 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
1125 | return; | |
1126 | idx = context->name_count++; | |
1127 | context->names[idx].name = NULL; | |
1128 | #if AUDIT_DEBUG | |
1129 | ++context->ino_count; | |
1130 | #endif | |
1131 | } | |
ae7b961b DW |
1132 | context->names[idx].flags = flags; |
1133 | context->names[idx].ino = inode->i_ino; | |
1134 | context->names[idx].dev = inode->i_sb->s_dev; | |
1135 | context->names[idx].mode = inode->i_mode; | |
1136 | context->names[idx].uid = inode->i_uid; | |
1137 | context->names[idx].gid = inode->i_gid; | |
1138 | context->names[idx].rdev = inode->i_rdev; | |
1da177e4 LT |
1139 | } |
1140 | ||
bfb4496e DW |
1141 | void auditsc_get_stamp(struct audit_context *ctx, |
1142 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1143 | { |
ce625a80 DW |
1144 | if (!ctx->serial) |
1145 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1146 | t->tv_sec = ctx->ctime.tv_sec; |
1147 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1148 | *serial = ctx->serial; | |
1149 | ctx->auditable = 1; | |
1da177e4 LT |
1150 | } |
1151 | ||
456be6cd | 1152 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1153 | { |
456be6cd | 1154 | if (task->audit_context) { |
c0404993 SG |
1155 | struct audit_buffer *ab; |
1156 | ||
9ad9ad38 | 1157 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
c0404993 SG |
1158 | if (ab) { |
1159 | audit_log_format(ab, "login pid=%d uid=%u " | |
326e9c8b | 1160 | "old auid=%u new auid=%u", |
c0404993 SG |
1161 | task->pid, task->uid, |
1162 | task->audit_context->loginuid, loginuid); | |
1163 | audit_log_end(ab); | |
1164 | } | |
456be6cd | 1165 | task->audit_context->loginuid = loginuid; |
1da177e4 LT |
1166 | } |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | uid_t audit_get_loginuid(struct audit_context *ctx) | |
1171 | { | |
1172 | return ctx ? ctx->loginuid : -1; | |
1173 | } | |
1174 | ||
1175 | int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode) | |
1176 | { | |
1177 | struct audit_aux_data_ipcctl *ax; | |
1178 | struct audit_context *context = current->audit_context; | |
1179 | ||
1180 | if (likely(!context)) | |
1181 | return 0; | |
1182 | ||
1183 | ax = kmalloc(sizeof(*ax), GFP_KERNEL); | |
1184 | if (!ax) | |
1185 | return -ENOMEM; | |
1186 | ||
1187 | ax->qbytes = qbytes; | |
1188 | ax->uid = uid; | |
1189 | ax->gid = gid; | |
1190 | ax->mode = mode; | |
1191 | ||
c0404993 | 1192 | ax->d.type = AUDIT_IPC; |
1da177e4 LT |
1193 | ax->d.next = context->aux; |
1194 | context->aux = (void *)ax; | |
1195 | return 0; | |
1196 | } | |
c2f0c7c3 | 1197 | |
3ec3b2fb DW |
1198 | int audit_socketcall(int nargs, unsigned long *args) |
1199 | { | |
1200 | struct audit_aux_data_socketcall *ax; | |
1201 | struct audit_context *context = current->audit_context; | |
1202 | ||
1203 | if (likely(!context)) | |
1204 | return 0; | |
1205 | ||
1206 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1207 | if (!ax) | |
1208 | return -ENOMEM; | |
1209 | ||
1210 | ax->nargs = nargs; | |
1211 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1212 | ||
1213 | ax->d.type = AUDIT_SOCKETCALL; | |
1214 | ax->d.next = context->aux; | |
1215 | context->aux = (void *)ax; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | int audit_sockaddr(int len, void *a) | |
1220 | { | |
1221 | struct audit_aux_data_sockaddr *ax; | |
1222 | struct audit_context *context = current->audit_context; | |
1223 | ||
1224 | if (likely(!context)) | |
1225 | return 0; | |
1226 | ||
1227 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1228 | if (!ax) | |
1229 | return -ENOMEM; | |
1230 | ||
1231 | ax->len = len; | |
1232 | memcpy(ax->a, a, len); | |
1233 | ||
1234 | ax->d.type = AUDIT_SOCKADDR; | |
1235 | ax->d.next = context->aux; | |
1236 | context->aux = (void *)ax; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
01116105 SS |
1240 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1241 | { | |
1242 | struct audit_aux_data_path *ax; | |
1243 | struct audit_context *context = current->audit_context; | |
1244 | ||
1245 | if (likely(!context)) | |
1246 | return 0; | |
1247 | ||
1248 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1249 | if (!ax) | |
1250 | return -ENOMEM; | |
1251 | ||
1252 | ax->dentry = dget(dentry); | |
1253 | ax->mnt = mntget(mnt); | |
1254 | ||
1255 | ax->d.type = AUDIT_AVC_PATH; | |
1256 | ax->d.next = context->aux; | |
1257 | context->aux = (void *)ax; | |
1258 | return 0; | |
1259 | } | |
1260 | ||
c2f0c7c3 SG |
1261 | void audit_signal_info(int sig, struct task_struct *t) |
1262 | { | |
1263 | extern pid_t audit_sig_pid; | |
1264 | extern uid_t audit_sig_uid; | |
c2f0c7c3 | 1265 | |
582edda5 | 1266 | if (unlikely(audit_pid && t->tgid == audit_pid)) { |
c2f0c7c3 SG |
1267 | if (sig == SIGTERM || sig == SIGHUP) { |
1268 | struct audit_context *ctx = current->audit_context; | |
1269 | audit_sig_pid = current->pid; | |
1270 | if (ctx) | |
1271 | audit_sig_uid = ctx->loginuid; | |
1272 | else | |
1273 | audit_sig_uid = current->uid; | |
1274 | } | |
1275 | } | |
1276 | } | |
1277 |