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1/* auditfilter.c -- filtering of audit events
2 *
3 * Copyright 2003-2004 Red Hat, Inc.
4 * Copyright 2005 Hewlett-Packard Development Company, L.P.
5 * Copyright 2005 IBM Corporation
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
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/kernel.h>
25#include <linux/audit.h>
26#include <linux/kthread.h>
27#include <linux/mutex.h>
28#include <linux/fs.h>
29#include <linux/namei.h>
30#include <linux/netlink.h>
31#include <linux/sched.h>
32#include <linux/slab.h>
33#include <linux/security.h>
34#include <net/net_namespace.h>
35#include <net/sock.h>
36#include "audit.h"
37
38/*
39 * Locking model:
40 *
41 * audit_filter_mutex:
42 * Synchronizes writes and blocking reads of audit's filterlist
43 * data. Rcu is used to traverse the filterlist and access
44 * contents of structs audit_entry, audit_watch and opaque
45 * LSM rules during filtering. If modified, these structures
46 * must be copied and replace their counterparts in the filterlist.
47 * An audit_parent struct is not accessed during filtering, so may
48 * be written directly provided audit_filter_mutex is held.
49 */
50
51/* Audit filter lists, defined in <linux/audit.h> */
52struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
53 LIST_HEAD_INIT(audit_filter_list[0]),
54 LIST_HEAD_INIT(audit_filter_list[1]),
55 LIST_HEAD_INIT(audit_filter_list[2]),
56 LIST_HEAD_INIT(audit_filter_list[3]),
57 LIST_HEAD_INIT(audit_filter_list[4]),
58 LIST_HEAD_INIT(audit_filter_list[5]),
59#if AUDIT_NR_FILTERS != 6
60#error Fix audit_filter_list initialiser
61#endif
62};
63static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
64 LIST_HEAD_INIT(audit_rules_list[0]),
65 LIST_HEAD_INIT(audit_rules_list[1]),
66 LIST_HEAD_INIT(audit_rules_list[2]),
67 LIST_HEAD_INIT(audit_rules_list[3]),
68 LIST_HEAD_INIT(audit_rules_list[4]),
69 LIST_HEAD_INIT(audit_rules_list[5]),
70};
71
72DEFINE_MUTEX(audit_filter_mutex);
73
74static void audit_free_lsm_field(struct audit_field *f)
75{
76 switch (f->type) {
77 case AUDIT_SUBJ_USER:
78 case AUDIT_SUBJ_ROLE:
79 case AUDIT_SUBJ_TYPE:
80 case AUDIT_SUBJ_SEN:
81 case AUDIT_SUBJ_CLR:
82 case AUDIT_OBJ_USER:
83 case AUDIT_OBJ_ROLE:
84 case AUDIT_OBJ_TYPE:
85 case AUDIT_OBJ_LEV_LOW:
86 case AUDIT_OBJ_LEV_HIGH:
87 kfree(f->lsm_str);
88 security_audit_rule_free(f->lsm_rule);
89 }
90}
91
92static inline void audit_free_rule(struct audit_entry *e)
93{
94 int i;
95 struct audit_krule *erule = &e->rule;
96
97 /* some rules don't have associated watches */
98 if (erule->watch)
99 audit_put_watch(erule->watch);
100 if (erule->fields)
101 for (i = 0; i < erule->field_count; i++)
102 audit_free_lsm_field(&erule->fields[i]);
103 kfree(erule->fields);
104 kfree(erule->filterkey);
105 kfree(e);
106}
107
108void audit_free_rule_rcu(struct rcu_head *head)
109{
110 struct audit_entry *e = container_of(head, struct audit_entry, rcu);
111 audit_free_rule(e);
112}
113
114/* Initialize an audit filterlist entry. */
115static inline struct audit_entry *audit_init_entry(u32 field_count)
116{
117 struct audit_entry *entry;
118 struct audit_field *fields;
119
120 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
121 if (unlikely(!entry))
122 return NULL;
123
124 fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL);
125 if (unlikely(!fields)) {
126 kfree(entry);
127 return NULL;
128 }
129 entry->rule.fields = fields;
130
131 return entry;
132}
133
134/* Unpack a filter field's string representation from user-space
135 * buffer. */
136char *audit_unpack_string(void **bufp, size_t *remain, size_t len)
137{
138 char *str;
139
140 if (!*bufp || (len == 0) || (len > *remain))
141 return ERR_PTR(-EINVAL);
142
143 /* Of the currently implemented string fields, PATH_MAX
144 * defines the longest valid length.
145 */
146 if (len > PATH_MAX)
147 return ERR_PTR(-ENAMETOOLONG);
148
149 str = kmalloc(len + 1, GFP_KERNEL);
150 if (unlikely(!str))
151 return ERR_PTR(-ENOMEM);
152
153 memcpy(str, *bufp, len);
154 str[len] = 0;
155 *bufp += len;
156 *remain -= len;
157
158 return str;
159}
160
161/* Translate an inode field to kernel representation. */
162static inline int audit_to_inode(struct audit_krule *krule,
163 struct audit_field *f)
164{
165 if (krule->listnr != AUDIT_FILTER_EXIT ||
166 krule->inode_f || krule->watch || krule->tree ||
167 (f->op != Audit_equal && f->op != Audit_not_equal))
168 return -EINVAL;
169
170 krule->inode_f = f;
171 return 0;
172}
173
174static __u32 *classes[AUDIT_SYSCALL_CLASSES];
175
176int __init audit_register_class(int class, unsigned *list)
177{
178 __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL);
179 if (!p)
180 return -ENOMEM;
181 while (*list != ~0U) {
182 unsigned n = *list++;
183 if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
184 kfree(p);
185 return -EINVAL;
186 }
187 p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
188 }
189 if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
190 kfree(p);
191 return -EINVAL;
192 }
193 classes[class] = p;
194 return 0;
195}
196
197int audit_match_class(int class, unsigned syscall)
198{
199 if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32))
200 return 0;
201 if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class]))
202 return 0;
203 return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall);
204}
205
206#ifdef CONFIG_AUDITSYSCALL
207static inline int audit_match_class_bits(int class, u32 *mask)
208{
209 int i;
210
211 if (classes[class]) {
212 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
213 if (mask[i] & classes[class][i])
214 return 0;
215 }
216 return 1;
217}
218
219static int audit_match_signal(struct audit_entry *entry)
220{
221 struct audit_field *arch = entry->rule.arch_f;
222
223 if (!arch) {
224 /* When arch is unspecified, we must check both masks on biarch
225 * as syscall number alone is ambiguous. */
226 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
227 entry->rule.mask) &&
228 audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
229 entry->rule.mask));
230 }
231
232 switch(audit_classify_arch(arch->val)) {
233 case 0: /* native */
234 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
235 entry->rule.mask));
236 case 1: /* 32bit on biarch */
237 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
238 entry->rule.mask));
239 default:
240 return 1;
241 }
242}
243#endif
244
245/* Common user-space to kernel rule translation. */
246static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
247{
248 unsigned listnr;
249 struct audit_entry *entry;
250 int i, err;
251
252 err = -EINVAL;
253 listnr = rule->flags & ~AUDIT_FILTER_PREPEND;
254 switch(listnr) {
255 default:
256 goto exit_err;
257#ifdef CONFIG_AUDITSYSCALL
258 case AUDIT_FILTER_ENTRY:
259 if (rule->action == AUDIT_ALWAYS)
260 goto exit_err;
261 case AUDIT_FILTER_EXIT:
262 case AUDIT_FILTER_TASK:
263#endif
264 case AUDIT_FILTER_USER:
265 case AUDIT_FILTER_TYPE:
266 ;
267 }
268 if (unlikely(rule->action == AUDIT_POSSIBLE)) {
269 pr_err("AUDIT_POSSIBLE is deprecated\n");
270 goto exit_err;
271 }
272 if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
273 goto exit_err;
274 if (rule->field_count > AUDIT_MAX_FIELDS)
275 goto exit_err;
276
277 err = -ENOMEM;
278 entry = audit_init_entry(rule->field_count);
279 if (!entry)
280 goto exit_err;
281
282 entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND;
283 entry->rule.listnr = listnr;
284 entry->rule.action = rule->action;
285 entry->rule.field_count = rule->field_count;
286
287 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
288 entry->rule.mask[i] = rule->mask[i];
289
290 for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
291 int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
292 __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
293 __u32 *class;
294
295 if (!(*p & AUDIT_BIT(bit)))
296 continue;
297 *p &= ~AUDIT_BIT(bit);
298 class = classes[i];
299 if (class) {
300 int j;
301 for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
302 entry->rule.mask[j] |= class[j];
303 }
304 }
305
306 return entry;
307
308exit_err:
309 return ERR_PTR(err);
310}
311
312static u32 audit_ops[] =
313{
314 [Audit_equal] = AUDIT_EQUAL,
315 [Audit_not_equal] = AUDIT_NOT_EQUAL,
316 [Audit_bitmask] = AUDIT_BIT_MASK,
317 [Audit_bittest] = AUDIT_BIT_TEST,
318 [Audit_lt] = AUDIT_LESS_THAN,
319 [Audit_gt] = AUDIT_GREATER_THAN,
320 [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL,
321 [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL,
322};
323
324static u32 audit_to_op(u32 op)
325{
326 u32 n;
327 for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++)
328 ;
329 return n;
330}
331
332/* check if an audit field is valid */
333static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
334{
335 switch(f->type) {
336 case AUDIT_MSGTYPE:
337 if (entry->rule.listnr != AUDIT_FILTER_TYPE &&
338 entry->rule.listnr != AUDIT_FILTER_USER)
339 return -EINVAL;
340 break;
341 };
342
343 switch(f->type) {
344 default:
345 return -EINVAL;
346 case AUDIT_UID:
347 case AUDIT_EUID:
348 case AUDIT_SUID:
349 case AUDIT_FSUID:
350 case AUDIT_LOGINUID:
351 case AUDIT_OBJ_UID:
352 case AUDIT_GID:
353 case AUDIT_EGID:
354 case AUDIT_SGID:
355 case AUDIT_FSGID:
356 case AUDIT_OBJ_GID:
357 case AUDIT_PID:
358 case AUDIT_PERS:
359 case AUDIT_MSGTYPE:
360 case AUDIT_PPID:
361 case AUDIT_DEVMAJOR:
362 case AUDIT_DEVMINOR:
363 case AUDIT_EXIT:
364 case AUDIT_SUCCESS:
365 case AUDIT_INODE:
366 case AUDIT_SESSIONID:
367 /* bit ops are only useful on syscall args */
368 if (f->op == Audit_bitmask || f->op == Audit_bittest)
369 return -EINVAL;
370 break;
371 case AUDIT_ARG0:
372 case AUDIT_ARG1:
373 case AUDIT_ARG2:
374 case AUDIT_ARG3:
375 case AUDIT_SUBJ_USER:
376 case AUDIT_SUBJ_ROLE:
377 case AUDIT_SUBJ_TYPE:
378 case AUDIT_SUBJ_SEN:
379 case AUDIT_SUBJ_CLR:
380 case AUDIT_OBJ_USER:
381 case AUDIT_OBJ_ROLE:
382 case AUDIT_OBJ_TYPE:
383 case AUDIT_OBJ_LEV_LOW:
384 case AUDIT_OBJ_LEV_HIGH:
385 case AUDIT_WATCH:
386 case AUDIT_DIR:
387 case AUDIT_FILTERKEY:
388 break;
389 case AUDIT_LOGINUID_SET:
390 if ((f->val != 0) && (f->val != 1))
391 return -EINVAL;
392 /* FALL THROUGH */
393 case AUDIT_ARCH:
394 if (f->op != Audit_not_equal && f->op != Audit_equal)
395 return -EINVAL;
396 break;
397 case AUDIT_PERM:
398 if (f->val & ~15)
399 return -EINVAL;
400 break;
401 case AUDIT_FILETYPE:
402 if (f->val & ~S_IFMT)
403 return -EINVAL;
404 break;
405 case AUDIT_FIELD_COMPARE:
406 if (f->val > AUDIT_MAX_FIELD_COMPARE)
407 return -EINVAL;
408 break;
409 case AUDIT_EXE:
410 if (f->op != Audit_equal)
411 return -EINVAL;
412 if (entry->rule.listnr != AUDIT_FILTER_EXIT)
413 return -EINVAL;
414 break;
415 };
416 return 0;
417}
418
419/* Translate struct audit_rule_data to kernel's rule representation. */
420static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
421 size_t datasz)
422{
423 int err = 0;
424 struct audit_entry *entry;
425 void *bufp;
426 size_t remain = datasz - sizeof(struct audit_rule_data);
427 int i;
428 char *str;
429 struct audit_fsnotify_mark *audit_mark;
430
431 entry = audit_to_entry_common(data);
432 if (IS_ERR(entry))
433 goto exit_nofree;
434
435 bufp = data->buf;
436 for (i = 0; i < data->field_count; i++) {
437 struct audit_field *f = &entry->rule.fields[i];
438
439 err = -EINVAL;
440
441 f->op = audit_to_op(data->fieldflags[i]);
442 if (f->op == Audit_bad)
443 goto exit_free;
444
445 f->type = data->fields[i];
446 f->val = data->values[i];
447
448 /* Support legacy tests for a valid loginuid */
449 if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
450 f->type = AUDIT_LOGINUID_SET;
451 f->val = 0;
452 entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
453 }
454
455 err = audit_field_valid(entry, f);
456 if (err)
457 goto exit_free;
458
459 err = -EINVAL;
460 switch (f->type) {
461 case AUDIT_LOGINUID:
462 case AUDIT_UID:
463 case AUDIT_EUID:
464 case AUDIT_SUID:
465 case AUDIT_FSUID:
466 case AUDIT_OBJ_UID:
467 f->uid = make_kuid(current_user_ns(), f->val);
468 if (!uid_valid(f->uid))
469 goto exit_free;
470 break;
471 case AUDIT_GID:
472 case AUDIT_EGID:
473 case AUDIT_SGID:
474 case AUDIT_FSGID:
475 case AUDIT_OBJ_GID:
476 f->gid = make_kgid(current_user_ns(), f->val);
477 if (!gid_valid(f->gid))
478 goto exit_free;
479 break;
480 case AUDIT_SESSIONID:
481 case AUDIT_ARCH:
482 entry->rule.arch_f = f;
483 break;
484 case AUDIT_SUBJ_USER:
485 case AUDIT_SUBJ_ROLE:
486 case AUDIT_SUBJ_TYPE:
487 case AUDIT_SUBJ_SEN:
488 case AUDIT_SUBJ_CLR:
489 case AUDIT_OBJ_USER:
490 case AUDIT_OBJ_ROLE:
491 case AUDIT_OBJ_TYPE:
492 case AUDIT_OBJ_LEV_LOW:
493 case AUDIT_OBJ_LEV_HIGH:
494 str = audit_unpack_string(&bufp, &remain, f->val);
495 if (IS_ERR(str))
496 goto exit_free;
497 entry->rule.buflen += f->val;
498
499 err = security_audit_rule_init(f->type, f->op, str,
500 (void **)&f->lsm_rule);
501 /* Keep currently invalid fields around in case they
502 * become valid after a policy reload. */
503 if (err == -EINVAL) {
504 pr_warn("audit rule for LSM \'%s\' is invalid\n",
505 str);
506 err = 0;
507 }
508 if (err) {
509 kfree(str);
510 goto exit_free;
511 } else
512 f->lsm_str = str;
513 break;
514 case AUDIT_WATCH:
515 str = audit_unpack_string(&bufp, &remain, f->val);
516 if (IS_ERR(str))
517 goto exit_free;
518 entry->rule.buflen += f->val;
519
520 err = audit_to_watch(&entry->rule, str, f->val, f->op);
521 if (err) {
522 kfree(str);
523 goto exit_free;
524 }
525 break;
526 case AUDIT_DIR:
527 str = audit_unpack_string(&bufp, &remain, f->val);
528 if (IS_ERR(str))
529 goto exit_free;
530 entry->rule.buflen += f->val;
531
532 err = audit_make_tree(&entry->rule, str, f->op);
533 kfree(str);
534 if (err)
535 goto exit_free;
536 break;
537 case AUDIT_INODE:
538 err = audit_to_inode(&entry->rule, f);
539 if (err)
540 goto exit_free;
541 break;
542 case AUDIT_FILTERKEY:
543 if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN)
544 goto exit_free;
545 str = audit_unpack_string(&bufp, &remain, f->val);
546 if (IS_ERR(str))
547 goto exit_free;
548 entry->rule.buflen += f->val;
549 entry->rule.filterkey = str;
550 break;
551 case AUDIT_EXE:
552 if (entry->rule.exe || f->val > PATH_MAX)
553 goto exit_free;
554 str = audit_unpack_string(&bufp, &remain, f->val);
555 if (IS_ERR(str)) {
556 err = PTR_ERR(str);
557 goto exit_free;
558 }
559 entry->rule.buflen += f->val;
560
561 audit_mark = audit_alloc_mark(&entry->rule, str, f->val);
562 if (IS_ERR(audit_mark)) {
563 kfree(str);
564 err = PTR_ERR(audit_mark);
565 goto exit_free;
566 }
567 entry->rule.exe = audit_mark;
568 break;
569 }
570 }
571
572 if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
573 entry->rule.inode_f = NULL;
574
575exit_nofree:
576 return entry;
577
578exit_free:
579 if (entry->rule.tree)
580 audit_put_tree(entry->rule.tree); /* that's the temporary one */
581 if (entry->rule.exe)
582 audit_remove_mark(entry->rule.exe); /* that's the template one */
583 audit_free_rule(entry);
584 return ERR_PTR(err);
585}
586
587/* Pack a filter field's string representation into data block. */
588static inline size_t audit_pack_string(void **bufp, const char *str)
589{
590 size_t len = strlen(str);
591
592 memcpy(*bufp, str, len);
593 *bufp += len;
594
595 return len;
596}
597
598/* Translate kernel rule representation to struct audit_rule_data. */
599static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
600{
601 struct audit_rule_data *data;
602 void *bufp;
603 int i;
604
605 data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
606 if (unlikely(!data))
607 return NULL;
608 memset(data, 0, sizeof(*data));
609
610 data->flags = krule->flags | krule->listnr;
611 data->action = krule->action;
612 data->field_count = krule->field_count;
613 bufp = data->buf;
614 for (i = 0; i < data->field_count; i++) {
615 struct audit_field *f = &krule->fields[i];
616
617 data->fields[i] = f->type;
618 data->fieldflags[i] = audit_ops[f->op];
619 switch(f->type) {
620 case AUDIT_SUBJ_USER:
621 case AUDIT_SUBJ_ROLE:
622 case AUDIT_SUBJ_TYPE:
623 case AUDIT_SUBJ_SEN:
624 case AUDIT_SUBJ_CLR:
625 case AUDIT_OBJ_USER:
626 case AUDIT_OBJ_ROLE:
627 case AUDIT_OBJ_TYPE:
628 case AUDIT_OBJ_LEV_LOW:
629 case AUDIT_OBJ_LEV_HIGH:
630 data->buflen += data->values[i] =
631 audit_pack_string(&bufp, f->lsm_str);
632 break;
633 case AUDIT_WATCH:
634 data->buflen += data->values[i] =
635 audit_pack_string(&bufp,
636 audit_watch_path(krule->watch));
637 break;
638 case AUDIT_DIR:
639 data->buflen += data->values[i] =
640 audit_pack_string(&bufp,
641 audit_tree_path(krule->tree));
642 break;
643 case AUDIT_FILTERKEY:
644 data->buflen += data->values[i] =
645 audit_pack_string(&bufp, krule->filterkey);
646 break;
647 case AUDIT_EXE:
648 data->buflen += data->values[i] =
649 audit_pack_string(&bufp, audit_mark_path(krule->exe));
650 break;
651 case AUDIT_LOGINUID_SET:
652 if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
653 data->fields[i] = AUDIT_LOGINUID;
654 data->values[i] = AUDIT_UID_UNSET;
655 break;
656 }
657 /* fallthrough if set */
658 default:
659 data->values[i] = f->val;
660 }
661 }
662 for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i];
663
664 return data;
665}
666
667/* Compare two rules in kernel format. Considered success if rules
668 * don't match. */
669static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
670{
671 int i;
672
673 if (a->flags != b->flags ||
674 a->pflags != b->pflags ||
675 a->listnr != b->listnr ||
676 a->action != b->action ||
677 a->field_count != b->field_count)
678 return 1;
679
680 for (i = 0; i < a->field_count; i++) {
681 if (a->fields[i].type != b->fields[i].type ||
682 a->fields[i].op != b->fields[i].op)
683 return 1;
684
685 switch(a->fields[i].type) {
686 case AUDIT_SUBJ_USER:
687 case AUDIT_SUBJ_ROLE:
688 case AUDIT_SUBJ_TYPE:
689 case AUDIT_SUBJ_SEN:
690 case AUDIT_SUBJ_CLR:
691 case AUDIT_OBJ_USER:
692 case AUDIT_OBJ_ROLE:
693 case AUDIT_OBJ_TYPE:
694 case AUDIT_OBJ_LEV_LOW:
695 case AUDIT_OBJ_LEV_HIGH:
696 if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str))
697 return 1;
698 break;
699 case AUDIT_WATCH:
700 if (strcmp(audit_watch_path(a->watch),
701 audit_watch_path(b->watch)))
702 return 1;
703 break;
704 case AUDIT_DIR:
705 if (strcmp(audit_tree_path(a->tree),
706 audit_tree_path(b->tree)))
707 return 1;
708 break;
709 case AUDIT_FILTERKEY:
710 /* both filterkeys exist based on above type compare */
711 if (strcmp(a->filterkey, b->filterkey))
712 return 1;
713 break;
714 case AUDIT_EXE:
715 /* both paths exist based on above type compare */
716 if (strcmp(audit_mark_path(a->exe),
717 audit_mark_path(b->exe)))
718 return 1;
719 break;
720 case AUDIT_UID:
721 case AUDIT_EUID:
722 case AUDIT_SUID:
723 case AUDIT_FSUID:
724 case AUDIT_LOGINUID:
725 case AUDIT_OBJ_UID:
726 if (!uid_eq(a->fields[i].uid, b->fields[i].uid))
727 return 1;
728 break;
729 case AUDIT_GID:
730 case AUDIT_EGID:
731 case AUDIT_SGID:
732 case AUDIT_FSGID:
733 case AUDIT_OBJ_GID:
734 if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
735 return 1;
736 break;
737 default:
738 if (a->fields[i].val != b->fields[i].val)
739 return 1;
740 }
741 }
742
743 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
744 if (a->mask[i] != b->mask[i])
745 return 1;
746
747 return 0;
748}
749
750/* Duplicate LSM field information. The lsm_rule is opaque, so must be
751 * re-initialized. */
752static inline int audit_dupe_lsm_field(struct audit_field *df,
753 struct audit_field *sf)
754{
755 int ret = 0;
756 char *lsm_str;
757
758 /* our own copy of lsm_str */
759 lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL);
760 if (unlikely(!lsm_str))
761 return -ENOMEM;
762 df->lsm_str = lsm_str;
763
764 /* our own (refreshed) copy of lsm_rule */
765 ret = security_audit_rule_init(df->type, df->op, df->lsm_str,
766 (void **)&df->lsm_rule);
767 /* Keep currently invalid fields around in case they
768 * become valid after a policy reload. */
769 if (ret == -EINVAL) {
770 pr_warn("audit rule for LSM \'%s\' is invalid\n",
771 df->lsm_str);
772 ret = 0;
773 }
774
775 return ret;
776}
777
778/* Duplicate an audit rule. This will be a deep copy with the exception
779 * of the watch - that pointer is carried over. The LSM specific fields
780 * will be updated in the copy. The point is to be able to replace the old
781 * rule with the new rule in the filterlist, then free the old rule.
782 * The rlist element is undefined; list manipulations are handled apart from
783 * the initial copy. */
784struct audit_entry *audit_dupe_rule(struct audit_krule *old)
785{
786 u32 fcount = old->field_count;
787 struct audit_entry *entry;
788 struct audit_krule *new;
789 char *fk;
790 int i, err = 0;
791
792 entry = audit_init_entry(fcount);
793 if (unlikely(!entry))
794 return ERR_PTR(-ENOMEM);
795
796 new = &entry->rule;
797 new->flags = old->flags;
798 new->pflags = old->pflags;
799 new->listnr = old->listnr;
800 new->action = old->action;
801 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
802 new->mask[i] = old->mask[i];
803 new->prio = old->prio;
804 new->buflen = old->buflen;
805 new->inode_f = old->inode_f;
806 new->field_count = old->field_count;
807
808 /*
809 * note that we are OK with not refcounting here; audit_match_tree()
810 * never dereferences tree and we can't get false positives there
811 * since we'd have to have rule gone from the list *and* removed
812 * before the chunks found by lookup had been allocated, i.e. before
813 * the beginning of list scan.
814 */
815 new->tree = old->tree;
816 memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount);
817
818 /* deep copy this information, updating the lsm_rule fields, because
819 * the originals will all be freed when the old rule is freed. */
820 for (i = 0; i < fcount; i++) {
821 switch (new->fields[i].type) {
822 case AUDIT_SUBJ_USER:
823 case AUDIT_SUBJ_ROLE:
824 case AUDIT_SUBJ_TYPE:
825 case AUDIT_SUBJ_SEN:
826 case AUDIT_SUBJ_CLR:
827 case AUDIT_OBJ_USER:
828 case AUDIT_OBJ_ROLE:
829 case AUDIT_OBJ_TYPE:
830 case AUDIT_OBJ_LEV_LOW:
831 case AUDIT_OBJ_LEV_HIGH:
832 err = audit_dupe_lsm_field(&new->fields[i],
833 &old->fields[i]);
834 break;
835 case AUDIT_FILTERKEY:
836 fk = kstrdup(old->filterkey, GFP_KERNEL);
837 if (unlikely(!fk))
838 err = -ENOMEM;
839 else
840 new->filterkey = fk;
841 break;
842 case AUDIT_EXE:
843 err = audit_dupe_exe(new, old);
844 break;
845 }
846 if (err) {
847 if (new->exe)
848 audit_remove_mark(new->exe);
849 audit_free_rule(entry);
850 return ERR_PTR(err);
851 }
852 }
853
854 if (old->watch) {
855 audit_get_watch(old->watch);
856 new->watch = old->watch;
857 }
858
859 return entry;
860}
861
862/* Find an existing audit rule.
863 * Caller must hold audit_filter_mutex to prevent stale rule data. */
864static struct audit_entry *audit_find_rule(struct audit_entry *entry,
865 struct list_head **p)
866{
867 struct audit_entry *e, *found = NULL;
868 struct list_head *list;
869 int h;
870
871 if (entry->rule.inode_f) {
872 h = audit_hash_ino(entry->rule.inode_f->val);
873 *p = list = &audit_inode_hash[h];
874 } else if (entry->rule.watch) {
875 /* we don't know the inode number, so must walk entire hash */
876 for (h = 0; h < AUDIT_INODE_BUCKETS; h++) {
877 list = &audit_inode_hash[h];
878 list_for_each_entry(e, list, list)
879 if (!audit_compare_rule(&entry->rule, &e->rule)) {
880 found = e;
881 goto out;
882 }
883 }
884 goto out;
885 } else {
886 *p = list = &audit_filter_list[entry->rule.listnr];
887 }
888
889 list_for_each_entry(e, list, list)
890 if (!audit_compare_rule(&entry->rule, &e->rule)) {
891 found = e;
892 goto out;
893 }
894
895out:
896 return found;
897}
898
899static u64 prio_low = ~0ULL/2;
900static u64 prio_high = ~0ULL/2 - 1;
901
902/* Add rule to given filterlist if not a duplicate. */
903static inline int audit_add_rule(struct audit_entry *entry)
904{
905 struct audit_entry *e;
906 struct audit_watch *watch = entry->rule.watch;
907 struct audit_tree *tree = entry->rule.tree;
908 struct list_head *list;
909 int err = 0;
910#ifdef CONFIG_AUDITSYSCALL
911 int dont_count = 0;
912
913 /* If either of these, don't count towards total */
914 if (entry->rule.listnr == AUDIT_FILTER_USER ||
915 entry->rule.listnr == AUDIT_FILTER_TYPE)
916 dont_count = 1;
917#endif
918
919 mutex_lock(&audit_filter_mutex);
920 e = audit_find_rule(entry, &list);
921 if (e) {
922 mutex_unlock(&audit_filter_mutex);
923 err = -EEXIST;
924 /* normally audit_add_tree_rule() will free it on failure */
925 if (tree)
926 audit_put_tree(tree);
927 return err;
928 }
929
930 if (watch) {
931 /* audit_filter_mutex is dropped and re-taken during this call */
932 err = audit_add_watch(&entry->rule, &list);
933 if (err) {
934 mutex_unlock(&audit_filter_mutex);
935 /*
936 * normally audit_add_tree_rule() will free it
937 * on failure
938 */
939 if (tree)
940 audit_put_tree(tree);
941 return err;
942 }
943 }
944 if (tree) {
945 err = audit_add_tree_rule(&entry->rule);
946 if (err) {
947 mutex_unlock(&audit_filter_mutex);
948 return err;
949 }
950 }
951
952 entry->rule.prio = ~0ULL;
953 if (entry->rule.listnr == AUDIT_FILTER_EXIT) {
954 if (entry->rule.flags & AUDIT_FILTER_PREPEND)
955 entry->rule.prio = ++prio_high;
956 else
957 entry->rule.prio = --prio_low;
958 }
959
960 if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
961 list_add(&entry->rule.list,
962 &audit_rules_list[entry->rule.listnr]);
963 list_add_rcu(&entry->list, list);
964 entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
965 } else {
966 list_add_tail(&entry->rule.list,
967 &audit_rules_list[entry->rule.listnr]);
968 list_add_tail_rcu(&entry->list, list);
969 }
970#ifdef CONFIG_AUDITSYSCALL
971 if (!dont_count)
972 audit_n_rules++;
973
974 if (!audit_match_signal(entry))
975 audit_signals++;
976#endif
977 mutex_unlock(&audit_filter_mutex);
978
979 return err;
980}
981
982/* Remove an existing rule from filterlist. */
983int audit_del_rule(struct audit_entry *entry)
984{
985 struct audit_entry *e;
986 struct audit_tree *tree = entry->rule.tree;
987 struct list_head *list;
988 int ret = 0;
989#ifdef CONFIG_AUDITSYSCALL
990 int dont_count = 0;
991
992 /* If either of these, don't count towards total */
993 if (entry->rule.listnr == AUDIT_FILTER_USER ||
994 entry->rule.listnr == AUDIT_FILTER_TYPE)
995 dont_count = 1;
996#endif
997
998 mutex_lock(&audit_filter_mutex);
999 e = audit_find_rule(entry, &list);
1000 if (!e) {
1001 ret = -ENOENT;
1002 goto out;
1003 }
1004
1005 if (e->rule.watch)
1006 audit_remove_watch_rule(&e->rule);
1007
1008 if (e->rule.tree)
1009 audit_remove_tree_rule(&e->rule);
1010
1011 if (e->rule.exe)
1012 audit_remove_mark_rule(&e->rule);
1013
1014#ifdef CONFIG_AUDITSYSCALL
1015 if (!dont_count)
1016 audit_n_rules--;
1017
1018 if (!audit_match_signal(entry))
1019 audit_signals--;
1020#endif
1021
1022 list_del_rcu(&e->list);
1023 list_del(&e->rule.list);
1024 call_rcu(&e->rcu, audit_free_rule_rcu);
1025
1026out:
1027 mutex_unlock(&audit_filter_mutex);
1028
1029 if (tree)
1030 audit_put_tree(tree); /* that's the temporary one */
1031
1032 return ret;
1033}
1034
1035/* List rules using struct audit_rule_data. */
1036static void audit_list_rules(__u32 portid, int seq, struct sk_buff_head *q)
1037{
1038 struct sk_buff *skb;
1039 struct audit_krule *r;
1040 int i;
1041
1042 /* This is a blocking read, so use audit_filter_mutex instead of rcu
1043 * iterator to sync with list writers. */
1044 for (i=0; i<AUDIT_NR_FILTERS; i++) {
1045 list_for_each_entry(r, &audit_rules_list[i], list) {
1046 struct audit_rule_data *data;
1047
1048 data = audit_krule_to_data(r);
1049 if (unlikely(!data))
1050 break;
1051 skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES,
1052 0, 1, data,
1053 sizeof(*data) + data->buflen);
1054 if (skb)
1055 skb_queue_tail(q, skb);
1056 kfree(data);
1057 }
1058 }
1059 skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, 1, 1, NULL, 0);
1060 if (skb)
1061 skb_queue_tail(q, skb);
1062}
1063
1064/* Log rule additions and removals */
1065static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
1066{
1067 struct audit_buffer *ab;
1068 uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
1069 unsigned int sessionid = audit_get_sessionid(current);
1070
1071 if (!audit_enabled)
1072 return;
1073
1074 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
1075 if (!ab)
1076 return;
1077 audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
1078 audit_log_task_context(ab);
1079 audit_log_format(ab, " op=%s", action);
1080 audit_log_key(ab, rule->filterkey);
1081 audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
1082 audit_log_end(ab);
1083}
1084
1085/**
1086 * audit_rule_change - apply all rules to the specified message type
1087 * @type: audit message type
1088 * @portid: target port id for netlink audit messages
1089 * @seq: netlink audit message sequence (serial) number
1090 * @data: payload data
1091 * @datasz: size of payload data
1092 */
1093int audit_rule_change(int type, __u32 portid, int seq, void *data,
1094 size_t datasz)
1095{
1096 int err = 0;
1097 struct audit_entry *entry;
1098
1099 entry = audit_data_to_entry(data, datasz);
1100 if (IS_ERR(entry))
1101 return PTR_ERR(entry);
1102
1103 switch (type) {
1104 case AUDIT_ADD_RULE:
1105 err = audit_add_rule(entry);
1106 audit_log_rule_change("add_rule", &entry->rule, !err);
1107 break;
1108 case AUDIT_DEL_RULE:
1109 err = audit_del_rule(entry);
1110 audit_log_rule_change("remove_rule", &entry->rule, !err);
1111 break;
1112 default:
1113 err = -EINVAL;
1114 WARN_ON(1);
1115 }
1116
1117 if (err || type == AUDIT_DEL_RULE) {
1118 if (entry->rule.exe)
1119 audit_remove_mark(entry->rule.exe);
1120 audit_free_rule(entry);
1121 }
1122
1123 return err;
1124}
1125
1126/**
1127 * audit_list_rules_send - list the audit rules
1128 * @request_skb: skb of request we are replying to (used to target the reply)
1129 * @seq: netlink audit message sequence (serial) number
1130 */
1131int audit_list_rules_send(struct sk_buff *request_skb, int seq)
1132{
1133 u32 portid = NETLINK_CB(request_skb).portid;
1134 struct net *net = sock_net(NETLINK_CB(request_skb).sk);
1135 struct task_struct *tsk;
1136 struct audit_netlink_list *dest;
1137 int err = 0;
1138
1139 /* We can't just spew out the rules here because we might fill
1140 * the available socket buffer space and deadlock waiting for
1141 * auditctl to read from it... which isn't ever going to
1142 * happen if we're actually running in the context of auditctl
1143 * trying to _send_ the stuff */
1144
1145 dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL);
1146 if (!dest)
1147 return -ENOMEM;
1148 dest->net = get_net(net);
1149 dest->portid = portid;
1150 skb_queue_head_init(&dest->q);
1151
1152 mutex_lock(&audit_filter_mutex);
1153 audit_list_rules(portid, seq, &dest->q);
1154 mutex_unlock(&audit_filter_mutex);
1155
1156 tsk = kthread_run(audit_send_list, dest, "audit_send_list");
1157 if (IS_ERR(tsk)) {
1158 skb_queue_purge(&dest->q);
1159 kfree(dest);
1160 err = PTR_ERR(tsk);
1161 }
1162
1163 return err;
1164}
1165
1166int audit_comparator(u32 left, u32 op, u32 right)
1167{
1168 switch (op) {
1169 case Audit_equal:
1170 return (left == right);
1171 case Audit_not_equal:
1172 return (left != right);
1173 case Audit_lt:
1174 return (left < right);
1175 case Audit_le:
1176 return (left <= right);
1177 case Audit_gt:
1178 return (left > right);
1179 case Audit_ge:
1180 return (left >= right);
1181 case Audit_bitmask:
1182 return (left & right);
1183 case Audit_bittest:
1184 return ((left & right) == right);
1185 default:
1186 BUG();
1187 return 0;
1188 }
1189}
1190
1191int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
1192{
1193 switch (op) {
1194 case Audit_equal:
1195 return uid_eq(left, right);
1196 case Audit_not_equal:
1197 return !uid_eq(left, right);
1198 case Audit_lt:
1199 return uid_lt(left, right);
1200 case Audit_le:
1201 return uid_lte(left, right);
1202 case Audit_gt:
1203 return uid_gt(left, right);
1204 case Audit_ge:
1205 return uid_gte(left, right);
1206 case Audit_bitmask:
1207 case Audit_bittest:
1208 default:
1209 BUG();
1210 return 0;
1211 }
1212}
1213
1214int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
1215{
1216 switch (op) {
1217 case Audit_equal:
1218 return gid_eq(left, right);
1219 case Audit_not_equal:
1220 return !gid_eq(left, right);
1221 case Audit_lt:
1222 return gid_lt(left, right);
1223 case Audit_le:
1224 return gid_lte(left, right);
1225 case Audit_gt:
1226 return gid_gt(left, right);
1227 case Audit_ge:
1228 return gid_gte(left, right);
1229 case Audit_bitmask:
1230 case Audit_bittest:
1231 default:
1232 BUG();
1233 return 0;
1234 }
1235}
1236
1237/**
1238 * parent_len - find the length of the parent portion of a pathname
1239 * @path: pathname of which to determine length
1240 */
1241int parent_len(const char *path)
1242{
1243 int plen;
1244 const char *p;
1245
1246 plen = strlen(path);
1247
1248 if (plen == 0)
1249 return plen;
1250
1251 /* disregard trailing slashes */
1252 p = path + plen - 1;
1253 while ((*p == '/') && (p > path))
1254 p--;
1255
1256 /* walk backward until we find the next slash or hit beginning */
1257 while ((*p != '/') && (p > path))
1258 p--;
1259
1260 /* did we find a slash? Then increment to include it in path */
1261 if (*p == '/')
1262 p++;
1263
1264 return p - path;
1265}
1266
1267/**
1268 * audit_compare_dname_path - compare given dentry name with last component in
1269 * given path. Return of 0 indicates a match.
1270 * @dname: dentry name that we're comparing
1271 * @path: full pathname that we're comparing
1272 * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
1273 * here indicates that we must compute this value.
1274 */
1275int audit_compare_dname_path(const char *dname, const char *path, int parentlen)
1276{
1277 int dlen, pathlen;
1278 const char *p;
1279
1280 dlen = strlen(dname);
1281 pathlen = strlen(path);
1282 if (pathlen < dlen)
1283 return 1;
1284
1285 parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
1286 if (pathlen - parentlen != dlen)
1287 return 1;
1288
1289 p = path + parentlen;
1290
1291 return strncmp(p, dname, dlen);
1292}
1293
1294int audit_filter(int msgtype, unsigned int listtype)
1295{
1296 struct audit_entry *e;
1297 int ret = 1; /* Audit by default */
1298
1299 rcu_read_lock();
1300 if (list_empty(&audit_filter_list[listtype]))
1301 goto unlock_and_return;
1302 list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) {
1303 int i, result = 0;
1304
1305 for (i = 0; i < e->rule.field_count; i++) {
1306 struct audit_field *f = &e->rule.fields[i];
1307 pid_t pid;
1308 u32 sid;
1309
1310 switch (f->type) {
1311 case AUDIT_PID:
1312 pid = task_pid_nr(current);
1313 result = audit_comparator(pid, f->op, f->val);
1314 break;
1315 case AUDIT_UID:
1316 result = audit_uid_comparator(current_uid(), f->op, f->uid);
1317 break;
1318 case AUDIT_GID:
1319 result = audit_gid_comparator(current_gid(), f->op, f->gid);
1320 break;
1321 case AUDIT_LOGINUID:
1322 result = audit_uid_comparator(audit_get_loginuid(current),
1323 f->op, f->uid);
1324 break;
1325 case AUDIT_LOGINUID_SET:
1326 result = audit_comparator(audit_loginuid_set(current),
1327 f->op, f->val);
1328 break;
1329 case AUDIT_MSGTYPE:
1330 result = audit_comparator(msgtype, f->op, f->val);
1331 break;
1332 case AUDIT_SUBJ_USER:
1333 case AUDIT_SUBJ_ROLE:
1334 case AUDIT_SUBJ_TYPE:
1335 case AUDIT_SUBJ_SEN:
1336 case AUDIT_SUBJ_CLR:
1337 if (f->lsm_rule) {
1338 security_task_getsecid(current, &sid);
1339 result = security_audit_rule_match(sid,
1340 f->type, f->op, f->lsm_rule, NULL);
1341 }
1342 break;
1343 default:
1344 goto unlock_and_return;
1345 }
1346 if (result < 0) /* error */
1347 goto unlock_and_return;
1348 if (!result)
1349 break;
1350 }
1351 if (result > 0) {
1352 if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_TYPE)
1353 ret = 0;
1354 break;
1355 }
1356 }
1357unlock_and_return:
1358 rcu_read_unlock();
1359 return ret;
1360}
1361
1362static int update_lsm_rule(struct audit_krule *r)
1363{
1364 struct audit_entry *entry = container_of(r, struct audit_entry, rule);
1365 struct audit_entry *nentry;
1366 int err = 0;
1367
1368 if (!security_audit_rule_known(r))
1369 return 0;
1370
1371 nentry = audit_dupe_rule(r);
1372 if (entry->rule.exe)
1373 audit_remove_mark(entry->rule.exe);
1374 if (IS_ERR(nentry)) {
1375 /* save the first error encountered for the
1376 * return value */
1377 err = PTR_ERR(nentry);
1378 audit_panic("error updating LSM filters");
1379 if (r->watch)
1380 list_del(&r->rlist);
1381 list_del_rcu(&entry->list);
1382 list_del(&r->list);
1383 } else {
1384 if (r->watch || r->tree)
1385 list_replace_init(&r->rlist, &nentry->rule.rlist);
1386 list_replace_rcu(&entry->list, &nentry->list);
1387 list_replace(&r->list, &nentry->rule.list);
1388 }
1389 call_rcu(&entry->rcu, audit_free_rule_rcu);
1390
1391 return err;
1392}
1393
1394/* This function will re-initialize the lsm_rule field of all applicable rules.
1395 * It will traverse the filter lists serarching for rules that contain LSM
1396 * specific filter fields. When such a rule is found, it is copied, the
1397 * LSM field is re-initialized, and the old rule is replaced with the
1398 * updated rule. */
1399int audit_update_lsm_rules(void)
1400{
1401 struct audit_krule *r, *n;
1402 int i, err = 0;
1403
1404 /* audit_filter_mutex synchronizes the writers */
1405 mutex_lock(&audit_filter_mutex);
1406
1407 for (i = 0; i < AUDIT_NR_FILTERS; i++) {
1408 list_for_each_entry_safe(r, n, &audit_rules_list[i], list) {
1409 int res = update_lsm_rule(r);
1410 if (!err)
1411 err = res;
1412 }
1413 }
1414 mutex_unlock(&audit_filter_mutex);
1415
1416 return err;
1417}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* auditfilter.c -- filtering of audit events
3 *
4 * Copyright 2003-2004 Red Hat, Inc.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright 2005 IBM Corporation
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/audit.h>
13#include <linux/kthread.h>
14#include <linux/mutex.h>
15#include <linux/fs.h>
16#include <linux/namei.h>
17#include <linux/netlink.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/security.h>
21#include <net/net_namespace.h>
22#include <net/sock.h>
23#include "audit.h"
24
25/*
26 * Locking model:
27 *
28 * audit_filter_mutex:
29 * Synchronizes writes and blocking reads of audit's filterlist
30 * data. Rcu is used to traverse the filterlist and access
31 * contents of structs audit_entry, audit_watch and opaque
32 * LSM rules during filtering. If modified, these structures
33 * must be copied and replace their counterparts in the filterlist.
34 * An audit_parent struct is not accessed during filtering, so may
35 * be written directly provided audit_filter_mutex is held.
36 */
37
38/* Audit filter lists, defined in <linux/audit.h> */
39struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
40 LIST_HEAD_INIT(audit_filter_list[0]),
41 LIST_HEAD_INIT(audit_filter_list[1]),
42 LIST_HEAD_INIT(audit_filter_list[2]),
43 LIST_HEAD_INIT(audit_filter_list[3]),
44 LIST_HEAD_INIT(audit_filter_list[4]),
45 LIST_HEAD_INIT(audit_filter_list[5]),
46 LIST_HEAD_INIT(audit_filter_list[6]),
47#if AUDIT_NR_FILTERS != 7
48#error Fix audit_filter_list initialiser
49#endif
50};
51static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
52 LIST_HEAD_INIT(audit_rules_list[0]),
53 LIST_HEAD_INIT(audit_rules_list[1]),
54 LIST_HEAD_INIT(audit_rules_list[2]),
55 LIST_HEAD_INIT(audit_rules_list[3]),
56 LIST_HEAD_INIT(audit_rules_list[4]),
57 LIST_HEAD_INIT(audit_rules_list[5]),
58 LIST_HEAD_INIT(audit_rules_list[6]),
59};
60
61DEFINE_MUTEX(audit_filter_mutex);
62
63static void audit_free_lsm_field(struct audit_field *f)
64{
65 switch (f->type) {
66 case AUDIT_SUBJ_USER:
67 case AUDIT_SUBJ_ROLE:
68 case AUDIT_SUBJ_TYPE:
69 case AUDIT_SUBJ_SEN:
70 case AUDIT_SUBJ_CLR:
71 case AUDIT_OBJ_USER:
72 case AUDIT_OBJ_ROLE:
73 case AUDIT_OBJ_TYPE:
74 case AUDIT_OBJ_LEV_LOW:
75 case AUDIT_OBJ_LEV_HIGH:
76 kfree(f->lsm_str);
77 security_audit_rule_free(f->lsm_rule);
78 }
79}
80
81static inline void audit_free_rule(struct audit_entry *e)
82{
83 int i;
84 struct audit_krule *erule = &e->rule;
85
86 /* some rules don't have associated watches */
87 if (erule->watch)
88 audit_put_watch(erule->watch);
89 if (erule->fields)
90 for (i = 0; i < erule->field_count; i++)
91 audit_free_lsm_field(&erule->fields[i]);
92 kfree(erule->fields);
93 kfree(erule->filterkey);
94 kfree(e);
95}
96
97void audit_free_rule_rcu(struct rcu_head *head)
98{
99 struct audit_entry *e = container_of(head, struct audit_entry, rcu);
100 audit_free_rule(e);
101}
102
103/* Initialize an audit filterlist entry. */
104static inline struct audit_entry *audit_init_entry(u32 field_count)
105{
106 struct audit_entry *entry;
107 struct audit_field *fields;
108
109 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
110 if (unlikely(!entry))
111 return NULL;
112
113 fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL);
114 if (unlikely(!fields)) {
115 kfree(entry);
116 return NULL;
117 }
118 entry->rule.fields = fields;
119
120 return entry;
121}
122
123/* Unpack a filter field's string representation from user-space
124 * buffer. */
125char *audit_unpack_string(void **bufp, size_t *remain, size_t len)
126{
127 char *str;
128
129 if (!*bufp || (len == 0) || (len > *remain))
130 return ERR_PTR(-EINVAL);
131
132 /* Of the currently implemented string fields, PATH_MAX
133 * defines the longest valid length.
134 */
135 if (len > PATH_MAX)
136 return ERR_PTR(-ENAMETOOLONG);
137
138 str = kmalloc(len + 1, GFP_KERNEL);
139 if (unlikely(!str))
140 return ERR_PTR(-ENOMEM);
141
142 memcpy(str, *bufp, len);
143 str[len] = 0;
144 *bufp += len;
145 *remain -= len;
146
147 return str;
148}
149
150/* Translate an inode field to kernel representation. */
151static inline int audit_to_inode(struct audit_krule *krule,
152 struct audit_field *f)
153{
154 if (krule->listnr != AUDIT_FILTER_EXIT ||
155 krule->inode_f || krule->watch || krule->tree ||
156 (f->op != Audit_equal && f->op != Audit_not_equal))
157 return -EINVAL;
158
159 krule->inode_f = f;
160 return 0;
161}
162
163static __u32 *classes[AUDIT_SYSCALL_CLASSES];
164
165int __init audit_register_class(int class, unsigned *list)
166{
167 __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL);
168 if (!p)
169 return -ENOMEM;
170 while (*list != ~0U) {
171 unsigned n = *list++;
172 if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
173 kfree(p);
174 return -EINVAL;
175 }
176 p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
177 }
178 if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
179 kfree(p);
180 return -EINVAL;
181 }
182 classes[class] = p;
183 return 0;
184}
185
186int audit_match_class(int class, unsigned syscall)
187{
188 if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32))
189 return 0;
190 if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class]))
191 return 0;
192 return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall);
193}
194
195#ifdef CONFIG_AUDITSYSCALL
196static inline int audit_match_class_bits(int class, u32 *mask)
197{
198 int i;
199
200 if (classes[class]) {
201 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
202 if (mask[i] & classes[class][i])
203 return 0;
204 }
205 return 1;
206}
207
208static int audit_match_signal(struct audit_entry *entry)
209{
210 struct audit_field *arch = entry->rule.arch_f;
211
212 if (!arch) {
213 /* When arch is unspecified, we must check both masks on biarch
214 * as syscall number alone is ambiguous. */
215 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
216 entry->rule.mask) &&
217 audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
218 entry->rule.mask));
219 }
220
221 switch(audit_classify_arch(arch->val)) {
222 case 0: /* native */
223 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
224 entry->rule.mask));
225 case 1: /* 32bit on biarch */
226 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
227 entry->rule.mask));
228 default:
229 return 1;
230 }
231}
232#endif
233
234/* Common user-space to kernel rule translation. */
235static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
236{
237 unsigned listnr;
238 struct audit_entry *entry;
239 int i, err;
240
241 err = -EINVAL;
242 listnr = rule->flags & ~AUDIT_FILTER_PREPEND;
243 switch(listnr) {
244 default:
245 goto exit_err;
246#ifdef CONFIG_AUDITSYSCALL
247 case AUDIT_FILTER_ENTRY:
248 pr_err("AUDIT_FILTER_ENTRY is deprecated\n");
249 goto exit_err;
250 case AUDIT_FILTER_EXIT:
251 case AUDIT_FILTER_TASK:
252#endif
253 case AUDIT_FILTER_USER:
254 case AUDIT_FILTER_EXCLUDE:
255 case AUDIT_FILTER_FS:
256 ;
257 }
258 if (unlikely(rule->action == AUDIT_POSSIBLE)) {
259 pr_err("AUDIT_POSSIBLE is deprecated\n");
260 goto exit_err;
261 }
262 if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
263 goto exit_err;
264 if (rule->field_count > AUDIT_MAX_FIELDS)
265 goto exit_err;
266
267 err = -ENOMEM;
268 entry = audit_init_entry(rule->field_count);
269 if (!entry)
270 goto exit_err;
271
272 entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND;
273 entry->rule.listnr = listnr;
274 entry->rule.action = rule->action;
275 entry->rule.field_count = rule->field_count;
276
277 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
278 entry->rule.mask[i] = rule->mask[i];
279
280 for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
281 int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
282 __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
283 __u32 *class;
284
285 if (!(*p & AUDIT_BIT(bit)))
286 continue;
287 *p &= ~AUDIT_BIT(bit);
288 class = classes[i];
289 if (class) {
290 int j;
291 for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
292 entry->rule.mask[j] |= class[j];
293 }
294 }
295
296 return entry;
297
298exit_err:
299 return ERR_PTR(err);
300}
301
302static u32 audit_ops[] =
303{
304 [Audit_equal] = AUDIT_EQUAL,
305 [Audit_not_equal] = AUDIT_NOT_EQUAL,
306 [Audit_bitmask] = AUDIT_BIT_MASK,
307 [Audit_bittest] = AUDIT_BIT_TEST,
308 [Audit_lt] = AUDIT_LESS_THAN,
309 [Audit_gt] = AUDIT_GREATER_THAN,
310 [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL,
311 [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL,
312};
313
314static u32 audit_to_op(u32 op)
315{
316 u32 n;
317 for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++)
318 ;
319 return n;
320}
321
322/* check if an audit field is valid */
323static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
324{
325 switch (f->type) {
326 case AUDIT_MSGTYPE:
327 if (entry->rule.listnr != AUDIT_FILTER_EXCLUDE &&
328 entry->rule.listnr != AUDIT_FILTER_USER)
329 return -EINVAL;
330 break;
331 case AUDIT_FSTYPE:
332 if (entry->rule.listnr != AUDIT_FILTER_FS)
333 return -EINVAL;
334 break;
335 }
336
337 switch (entry->rule.listnr) {
338 case AUDIT_FILTER_FS:
339 switch(f->type) {
340 case AUDIT_FSTYPE:
341 case AUDIT_FILTERKEY:
342 break;
343 default:
344 return -EINVAL;
345 }
346 }
347
348 /* Check for valid field type and op */
349 switch (f->type) {
350 case AUDIT_ARG0:
351 case AUDIT_ARG1:
352 case AUDIT_ARG2:
353 case AUDIT_ARG3:
354 case AUDIT_PERS: /* <uapi/linux/personality.h> */
355 case AUDIT_DEVMINOR:
356 /* all ops are valid */
357 break;
358 case AUDIT_UID:
359 case AUDIT_EUID:
360 case AUDIT_SUID:
361 case AUDIT_FSUID:
362 case AUDIT_LOGINUID:
363 case AUDIT_OBJ_UID:
364 case AUDIT_GID:
365 case AUDIT_EGID:
366 case AUDIT_SGID:
367 case AUDIT_FSGID:
368 case AUDIT_OBJ_GID:
369 case AUDIT_PID:
370 case AUDIT_MSGTYPE:
371 case AUDIT_PPID:
372 case AUDIT_DEVMAJOR:
373 case AUDIT_EXIT:
374 case AUDIT_SUCCESS:
375 case AUDIT_INODE:
376 case AUDIT_SESSIONID:
377 case AUDIT_SUBJ_SEN:
378 case AUDIT_SUBJ_CLR:
379 case AUDIT_OBJ_LEV_LOW:
380 case AUDIT_OBJ_LEV_HIGH:
381 case AUDIT_SADDR_FAM:
382 /* bit ops are only useful on syscall args */
383 if (f->op == Audit_bitmask || f->op == Audit_bittest)
384 return -EINVAL;
385 break;
386 case AUDIT_SUBJ_USER:
387 case AUDIT_SUBJ_ROLE:
388 case AUDIT_SUBJ_TYPE:
389 case AUDIT_OBJ_USER:
390 case AUDIT_OBJ_ROLE:
391 case AUDIT_OBJ_TYPE:
392 case AUDIT_WATCH:
393 case AUDIT_DIR:
394 case AUDIT_FILTERKEY:
395 case AUDIT_LOGINUID_SET:
396 case AUDIT_ARCH:
397 case AUDIT_FSTYPE:
398 case AUDIT_PERM:
399 case AUDIT_FILETYPE:
400 case AUDIT_FIELD_COMPARE:
401 case AUDIT_EXE:
402 /* only equal and not equal valid ops */
403 if (f->op != Audit_not_equal && f->op != Audit_equal)
404 return -EINVAL;
405 break;
406 default:
407 /* field not recognized */
408 return -EINVAL;
409 }
410
411 /* Check for select valid field values */
412 switch (f->type) {
413 case AUDIT_LOGINUID_SET:
414 if ((f->val != 0) && (f->val != 1))
415 return -EINVAL;
416 break;
417 case AUDIT_PERM:
418 if (f->val & ~15)
419 return -EINVAL;
420 break;
421 case AUDIT_FILETYPE:
422 if (f->val & ~S_IFMT)
423 return -EINVAL;
424 break;
425 case AUDIT_FIELD_COMPARE:
426 if (f->val > AUDIT_MAX_FIELD_COMPARE)
427 return -EINVAL;
428 break;
429 case AUDIT_SADDR_FAM:
430 if (f->val >= AF_MAX)
431 return -EINVAL;
432 break;
433 default:
434 break;
435 }
436
437 return 0;
438}
439
440/* Translate struct audit_rule_data to kernel's rule representation. */
441static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
442 size_t datasz)
443{
444 int err = 0;
445 struct audit_entry *entry;
446 void *bufp;
447 size_t remain = datasz - sizeof(struct audit_rule_data);
448 int i;
449 char *str;
450 struct audit_fsnotify_mark *audit_mark;
451
452 entry = audit_to_entry_common(data);
453 if (IS_ERR(entry))
454 goto exit_nofree;
455
456 bufp = data->buf;
457 for (i = 0; i < data->field_count; i++) {
458 struct audit_field *f = &entry->rule.fields[i];
459 u32 f_val;
460
461 err = -EINVAL;
462
463 f->op = audit_to_op(data->fieldflags[i]);
464 if (f->op == Audit_bad)
465 goto exit_free;
466
467 f->type = data->fields[i];
468 f_val = data->values[i];
469
470 /* Support legacy tests for a valid loginuid */
471 if ((f->type == AUDIT_LOGINUID) && (f_val == AUDIT_UID_UNSET)) {
472 f->type = AUDIT_LOGINUID_SET;
473 f_val = 0;
474 entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
475 }
476
477 err = audit_field_valid(entry, f);
478 if (err)
479 goto exit_free;
480
481 err = -EINVAL;
482 switch (f->type) {
483 case AUDIT_LOGINUID:
484 case AUDIT_UID:
485 case AUDIT_EUID:
486 case AUDIT_SUID:
487 case AUDIT_FSUID:
488 case AUDIT_OBJ_UID:
489 f->uid = make_kuid(current_user_ns(), f_val);
490 if (!uid_valid(f->uid))
491 goto exit_free;
492 break;
493 case AUDIT_GID:
494 case AUDIT_EGID:
495 case AUDIT_SGID:
496 case AUDIT_FSGID:
497 case AUDIT_OBJ_GID:
498 f->gid = make_kgid(current_user_ns(), f_val);
499 if (!gid_valid(f->gid))
500 goto exit_free;
501 break;
502 case AUDIT_ARCH:
503 f->val = f_val;
504 entry->rule.arch_f = f;
505 break;
506 case AUDIT_SUBJ_USER:
507 case AUDIT_SUBJ_ROLE:
508 case AUDIT_SUBJ_TYPE:
509 case AUDIT_SUBJ_SEN:
510 case AUDIT_SUBJ_CLR:
511 case AUDIT_OBJ_USER:
512 case AUDIT_OBJ_ROLE:
513 case AUDIT_OBJ_TYPE:
514 case AUDIT_OBJ_LEV_LOW:
515 case AUDIT_OBJ_LEV_HIGH:
516 str = audit_unpack_string(&bufp, &remain, f_val);
517 if (IS_ERR(str)) {
518 err = PTR_ERR(str);
519 goto exit_free;
520 }
521 entry->rule.buflen += f_val;
522 f->lsm_str = str;
523 err = security_audit_rule_init(f->type, f->op, str,
524 (void **)&f->lsm_rule);
525 /* Keep currently invalid fields around in case they
526 * become valid after a policy reload. */
527 if (err == -EINVAL) {
528 pr_warn("audit rule for LSM \'%s\' is invalid\n",
529 str);
530 err = 0;
531 } else if (err)
532 goto exit_free;
533 break;
534 case AUDIT_WATCH:
535 str = audit_unpack_string(&bufp, &remain, f_val);
536 if (IS_ERR(str)) {
537 err = PTR_ERR(str);
538 goto exit_free;
539 }
540 err = audit_to_watch(&entry->rule, str, f_val, f->op);
541 if (err) {
542 kfree(str);
543 goto exit_free;
544 }
545 entry->rule.buflen += f_val;
546 break;
547 case AUDIT_DIR:
548 str = audit_unpack_string(&bufp, &remain, f_val);
549 if (IS_ERR(str)) {
550 err = PTR_ERR(str);
551 goto exit_free;
552 }
553 err = audit_make_tree(&entry->rule, str, f->op);
554 kfree(str);
555 if (err)
556 goto exit_free;
557 entry->rule.buflen += f_val;
558 break;
559 case AUDIT_INODE:
560 f->val = f_val;
561 err = audit_to_inode(&entry->rule, f);
562 if (err)
563 goto exit_free;
564 break;
565 case AUDIT_FILTERKEY:
566 if (entry->rule.filterkey || f_val > AUDIT_MAX_KEY_LEN)
567 goto exit_free;
568 str = audit_unpack_string(&bufp, &remain, f_val);
569 if (IS_ERR(str)) {
570 err = PTR_ERR(str);
571 goto exit_free;
572 }
573 entry->rule.buflen += f_val;
574 entry->rule.filterkey = str;
575 break;
576 case AUDIT_EXE:
577 if (entry->rule.exe || f_val > PATH_MAX)
578 goto exit_free;
579 str = audit_unpack_string(&bufp, &remain, f_val);
580 if (IS_ERR(str)) {
581 err = PTR_ERR(str);
582 goto exit_free;
583 }
584 audit_mark = audit_alloc_mark(&entry->rule, str, f_val);
585 if (IS_ERR(audit_mark)) {
586 kfree(str);
587 err = PTR_ERR(audit_mark);
588 goto exit_free;
589 }
590 entry->rule.buflen += f_val;
591 entry->rule.exe = audit_mark;
592 break;
593 default:
594 f->val = f_val;
595 break;
596 }
597 }
598
599 if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
600 entry->rule.inode_f = NULL;
601
602exit_nofree:
603 return entry;
604
605exit_free:
606 if (entry->rule.tree)
607 audit_put_tree(entry->rule.tree); /* that's the temporary one */
608 if (entry->rule.exe)
609 audit_remove_mark(entry->rule.exe); /* that's the template one */
610 audit_free_rule(entry);
611 return ERR_PTR(err);
612}
613
614/* Pack a filter field's string representation into data block. */
615static inline size_t audit_pack_string(void **bufp, const char *str)
616{
617 size_t len = strlen(str);
618
619 memcpy(*bufp, str, len);
620 *bufp += len;
621
622 return len;
623}
624
625/* Translate kernel rule representation to struct audit_rule_data. */
626static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
627{
628 struct audit_rule_data *data;
629 void *bufp;
630 int i;
631
632 data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
633 if (unlikely(!data))
634 return NULL;
635 memset(data, 0, sizeof(*data));
636
637 data->flags = krule->flags | krule->listnr;
638 data->action = krule->action;
639 data->field_count = krule->field_count;
640 bufp = data->buf;
641 for (i = 0; i < data->field_count; i++) {
642 struct audit_field *f = &krule->fields[i];
643
644 data->fields[i] = f->type;
645 data->fieldflags[i] = audit_ops[f->op];
646 switch(f->type) {
647 case AUDIT_SUBJ_USER:
648 case AUDIT_SUBJ_ROLE:
649 case AUDIT_SUBJ_TYPE:
650 case AUDIT_SUBJ_SEN:
651 case AUDIT_SUBJ_CLR:
652 case AUDIT_OBJ_USER:
653 case AUDIT_OBJ_ROLE:
654 case AUDIT_OBJ_TYPE:
655 case AUDIT_OBJ_LEV_LOW:
656 case AUDIT_OBJ_LEV_HIGH:
657 data->buflen += data->values[i] =
658 audit_pack_string(&bufp, f->lsm_str);
659 break;
660 case AUDIT_WATCH:
661 data->buflen += data->values[i] =
662 audit_pack_string(&bufp,
663 audit_watch_path(krule->watch));
664 break;
665 case AUDIT_DIR:
666 data->buflen += data->values[i] =
667 audit_pack_string(&bufp,
668 audit_tree_path(krule->tree));
669 break;
670 case AUDIT_FILTERKEY:
671 data->buflen += data->values[i] =
672 audit_pack_string(&bufp, krule->filterkey);
673 break;
674 case AUDIT_EXE:
675 data->buflen += data->values[i] =
676 audit_pack_string(&bufp, audit_mark_path(krule->exe));
677 break;
678 case AUDIT_LOGINUID_SET:
679 if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
680 data->fields[i] = AUDIT_LOGINUID;
681 data->values[i] = AUDIT_UID_UNSET;
682 break;
683 }
684 fallthrough; /* if set */
685 default:
686 data->values[i] = f->val;
687 }
688 }
689 for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i];
690
691 return data;
692}
693
694/* Compare two rules in kernel format. Considered success if rules
695 * don't match. */
696static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
697{
698 int i;
699
700 if (a->flags != b->flags ||
701 a->pflags != b->pflags ||
702 a->listnr != b->listnr ||
703 a->action != b->action ||
704 a->field_count != b->field_count)
705 return 1;
706
707 for (i = 0; i < a->field_count; i++) {
708 if (a->fields[i].type != b->fields[i].type ||
709 a->fields[i].op != b->fields[i].op)
710 return 1;
711
712 switch(a->fields[i].type) {
713 case AUDIT_SUBJ_USER:
714 case AUDIT_SUBJ_ROLE:
715 case AUDIT_SUBJ_TYPE:
716 case AUDIT_SUBJ_SEN:
717 case AUDIT_SUBJ_CLR:
718 case AUDIT_OBJ_USER:
719 case AUDIT_OBJ_ROLE:
720 case AUDIT_OBJ_TYPE:
721 case AUDIT_OBJ_LEV_LOW:
722 case AUDIT_OBJ_LEV_HIGH:
723 if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str))
724 return 1;
725 break;
726 case AUDIT_WATCH:
727 if (strcmp(audit_watch_path(a->watch),
728 audit_watch_path(b->watch)))
729 return 1;
730 break;
731 case AUDIT_DIR:
732 if (strcmp(audit_tree_path(a->tree),
733 audit_tree_path(b->tree)))
734 return 1;
735 break;
736 case AUDIT_FILTERKEY:
737 /* both filterkeys exist based on above type compare */
738 if (strcmp(a->filterkey, b->filterkey))
739 return 1;
740 break;
741 case AUDIT_EXE:
742 /* both paths exist based on above type compare */
743 if (strcmp(audit_mark_path(a->exe),
744 audit_mark_path(b->exe)))
745 return 1;
746 break;
747 case AUDIT_UID:
748 case AUDIT_EUID:
749 case AUDIT_SUID:
750 case AUDIT_FSUID:
751 case AUDIT_LOGINUID:
752 case AUDIT_OBJ_UID:
753 if (!uid_eq(a->fields[i].uid, b->fields[i].uid))
754 return 1;
755 break;
756 case AUDIT_GID:
757 case AUDIT_EGID:
758 case AUDIT_SGID:
759 case AUDIT_FSGID:
760 case AUDIT_OBJ_GID:
761 if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
762 return 1;
763 break;
764 default:
765 if (a->fields[i].val != b->fields[i].val)
766 return 1;
767 }
768 }
769
770 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
771 if (a->mask[i] != b->mask[i])
772 return 1;
773
774 return 0;
775}
776
777/* Duplicate LSM field information. The lsm_rule is opaque, so must be
778 * re-initialized. */
779static inline int audit_dupe_lsm_field(struct audit_field *df,
780 struct audit_field *sf)
781{
782 int ret = 0;
783 char *lsm_str;
784
785 /* our own copy of lsm_str */
786 lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL);
787 if (unlikely(!lsm_str))
788 return -ENOMEM;
789 df->lsm_str = lsm_str;
790
791 /* our own (refreshed) copy of lsm_rule */
792 ret = security_audit_rule_init(df->type, df->op, df->lsm_str,
793 (void **)&df->lsm_rule);
794 /* Keep currently invalid fields around in case they
795 * become valid after a policy reload. */
796 if (ret == -EINVAL) {
797 pr_warn("audit rule for LSM \'%s\' is invalid\n",
798 df->lsm_str);
799 ret = 0;
800 }
801
802 return ret;
803}
804
805/* Duplicate an audit rule. This will be a deep copy with the exception
806 * of the watch - that pointer is carried over. The LSM specific fields
807 * will be updated in the copy. The point is to be able to replace the old
808 * rule with the new rule in the filterlist, then free the old rule.
809 * The rlist element is undefined; list manipulations are handled apart from
810 * the initial copy. */
811struct audit_entry *audit_dupe_rule(struct audit_krule *old)
812{
813 u32 fcount = old->field_count;
814 struct audit_entry *entry;
815 struct audit_krule *new;
816 char *fk;
817 int i, err = 0;
818
819 entry = audit_init_entry(fcount);
820 if (unlikely(!entry))
821 return ERR_PTR(-ENOMEM);
822
823 new = &entry->rule;
824 new->flags = old->flags;
825 new->pflags = old->pflags;
826 new->listnr = old->listnr;
827 new->action = old->action;
828 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
829 new->mask[i] = old->mask[i];
830 new->prio = old->prio;
831 new->buflen = old->buflen;
832 new->inode_f = old->inode_f;
833 new->field_count = old->field_count;
834
835 /*
836 * note that we are OK with not refcounting here; audit_match_tree()
837 * never dereferences tree and we can't get false positives there
838 * since we'd have to have rule gone from the list *and* removed
839 * before the chunks found by lookup had been allocated, i.e. before
840 * the beginning of list scan.
841 */
842 new->tree = old->tree;
843 memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount);
844
845 /* deep copy this information, updating the lsm_rule fields, because
846 * the originals will all be freed when the old rule is freed. */
847 for (i = 0; i < fcount; i++) {
848 switch (new->fields[i].type) {
849 case AUDIT_SUBJ_USER:
850 case AUDIT_SUBJ_ROLE:
851 case AUDIT_SUBJ_TYPE:
852 case AUDIT_SUBJ_SEN:
853 case AUDIT_SUBJ_CLR:
854 case AUDIT_OBJ_USER:
855 case AUDIT_OBJ_ROLE:
856 case AUDIT_OBJ_TYPE:
857 case AUDIT_OBJ_LEV_LOW:
858 case AUDIT_OBJ_LEV_HIGH:
859 err = audit_dupe_lsm_field(&new->fields[i],
860 &old->fields[i]);
861 break;
862 case AUDIT_FILTERKEY:
863 fk = kstrdup(old->filterkey, GFP_KERNEL);
864 if (unlikely(!fk))
865 err = -ENOMEM;
866 else
867 new->filterkey = fk;
868 break;
869 case AUDIT_EXE:
870 err = audit_dupe_exe(new, old);
871 break;
872 }
873 if (err) {
874 if (new->exe)
875 audit_remove_mark(new->exe);
876 audit_free_rule(entry);
877 return ERR_PTR(err);
878 }
879 }
880
881 if (old->watch) {
882 audit_get_watch(old->watch);
883 new->watch = old->watch;
884 }
885
886 return entry;
887}
888
889/* Find an existing audit rule.
890 * Caller must hold audit_filter_mutex to prevent stale rule data. */
891static struct audit_entry *audit_find_rule(struct audit_entry *entry,
892 struct list_head **p)
893{
894 struct audit_entry *e, *found = NULL;
895 struct list_head *list;
896 int h;
897
898 if (entry->rule.inode_f) {
899 h = audit_hash_ino(entry->rule.inode_f->val);
900 *p = list = &audit_inode_hash[h];
901 } else if (entry->rule.watch) {
902 /* we don't know the inode number, so must walk entire hash */
903 for (h = 0; h < AUDIT_INODE_BUCKETS; h++) {
904 list = &audit_inode_hash[h];
905 list_for_each_entry(e, list, list)
906 if (!audit_compare_rule(&entry->rule, &e->rule)) {
907 found = e;
908 goto out;
909 }
910 }
911 goto out;
912 } else {
913 *p = list = &audit_filter_list[entry->rule.listnr];
914 }
915
916 list_for_each_entry(e, list, list)
917 if (!audit_compare_rule(&entry->rule, &e->rule)) {
918 found = e;
919 goto out;
920 }
921
922out:
923 return found;
924}
925
926static u64 prio_low = ~0ULL/2;
927static u64 prio_high = ~0ULL/2 - 1;
928
929/* Add rule to given filterlist if not a duplicate. */
930static inline int audit_add_rule(struct audit_entry *entry)
931{
932 struct audit_entry *e;
933 struct audit_watch *watch = entry->rule.watch;
934 struct audit_tree *tree = entry->rule.tree;
935 struct list_head *list;
936 int err = 0;
937#ifdef CONFIG_AUDITSYSCALL
938 int dont_count = 0;
939
940 /* If any of these, don't count towards total */
941 switch(entry->rule.listnr) {
942 case AUDIT_FILTER_USER:
943 case AUDIT_FILTER_EXCLUDE:
944 case AUDIT_FILTER_FS:
945 dont_count = 1;
946 }
947#endif
948
949 mutex_lock(&audit_filter_mutex);
950 e = audit_find_rule(entry, &list);
951 if (e) {
952 mutex_unlock(&audit_filter_mutex);
953 err = -EEXIST;
954 /* normally audit_add_tree_rule() will free it on failure */
955 if (tree)
956 audit_put_tree(tree);
957 return err;
958 }
959
960 if (watch) {
961 /* audit_filter_mutex is dropped and re-taken during this call */
962 err = audit_add_watch(&entry->rule, &list);
963 if (err) {
964 mutex_unlock(&audit_filter_mutex);
965 /*
966 * normally audit_add_tree_rule() will free it
967 * on failure
968 */
969 if (tree)
970 audit_put_tree(tree);
971 return err;
972 }
973 }
974 if (tree) {
975 err = audit_add_tree_rule(&entry->rule);
976 if (err) {
977 mutex_unlock(&audit_filter_mutex);
978 return err;
979 }
980 }
981
982 entry->rule.prio = ~0ULL;
983 if (entry->rule.listnr == AUDIT_FILTER_EXIT) {
984 if (entry->rule.flags & AUDIT_FILTER_PREPEND)
985 entry->rule.prio = ++prio_high;
986 else
987 entry->rule.prio = --prio_low;
988 }
989
990 if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
991 list_add(&entry->rule.list,
992 &audit_rules_list[entry->rule.listnr]);
993 list_add_rcu(&entry->list, list);
994 entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
995 } else {
996 list_add_tail(&entry->rule.list,
997 &audit_rules_list[entry->rule.listnr]);
998 list_add_tail_rcu(&entry->list, list);
999 }
1000#ifdef CONFIG_AUDITSYSCALL
1001 if (!dont_count)
1002 audit_n_rules++;
1003
1004 if (!audit_match_signal(entry))
1005 audit_signals++;
1006#endif
1007 mutex_unlock(&audit_filter_mutex);
1008
1009 return err;
1010}
1011
1012/* Remove an existing rule from filterlist. */
1013int audit_del_rule(struct audit_entry *entry)
1014{
1015 struct audit_entry *e;
1016 struct audit_tree *tree = entry->rule.tree;
1017 struct list_head *list;
1018 int ret = 0;
1019#ifdef CONFIG_AUDITSYSCALL
1020 int dont_count = 0;
1021
1022 /* If any of these, don't count towards total */
1023 switch(entry->rule.listnr) {
1024 case AUDIT_FILTER_USER:
1025 case AUDIT_FILTER_EXCLUDE:
1026 case AUDIT_FILTER_FS:
1027 dont_count = 1;
1028 }
1029#endif
1030
1031 mutex_lock(&audit_filter_mutex);
1032 e = audit_find_rule(entry, &list);
1033 if (!e) {
1034 ret = -ENOENT;
1035 goto out;
1036 }
1037
1038 if (e->rule.watch)
1039 audit_remove_watch_rule(&e->rule);
1040
1041 if (e->rule.tree)
1042 audit_remove_tree_rule(&e->rule);
1043
1044 if (e->rule.exe)
1045 audit_remove_mark_rule(&e->rule);
1046
1047#ifdef CONFIG_AUDITSYSCALL
1048 if (!dont_count)
1049 audit_n_rules--;
1050
1051 if (!audit_match_signal(entry))
1052 audit_signals--;
1053#endif
1054
1055 list_del_rcu(&e->list);
1056 list_del(&e->rule.list);
1057 call_rcu(&e->rcu, audit_free_rule_rcu);
1058
1059out:
1060 mutex_unlock(&audit_filter_mutex);
1061
1062 if (tree)
1063 audit_put_tree(tree); /* that's the temporary one */
1064
1065 return ret;
1066}
1067
1068/* List rules using struct audit_rule_data. */
1069static void audit_list_rules(int seq, struct sk_buff_head *q)
1070{
1071 struct sk_buff *skb;
1072 struct audit_krule *r;
1073 int i;
1074
1075 /* This is a blocking read, so use audit_filter_mutex instead of rcu
1076 * iterator to sync with list writers. */
1077 for (i=0; i<AUDIT_NR_FILTERS; i++) {
1078 list_for_each_entry(r, &audit_rules_list[i], list) {
1079 struct audit_rule_data *data;
1080
1081 data = audit_krule_to_data(r);
1082 if (unlikely(!data))
1083 break;
1084 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1,
1085 data,
1086 sizeof(*data) + data->buflen);
1087 if (skb)
1088 skb_queue_tail(q, skb);
1089 kfree(data);
1090 }
1091 }
1092 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0);
1093 if (skb)
1094 skb_queue_tail(q, skb);
1095}
1096
1097/* Log rule additions and removals */
1098static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
1099{
1100 struct audit_buffer *ab;
1101
1102 if (!audit_enabled)
1103 return;
1104
1105 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
1106 if (!ab)
1107 return;
1108 audit_log_session_info(ab);
1109 audit_log_task_context(ab);
1110 audit_log_format(ab, " op=%s", action);
1111 audit_log_key(ab, rule->filterkey);
1112 audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
1113 audit_log_end(ab);
1114}
1115
1116/**
1117 * audit_rule_change - apply all rules to the specified message type
1118 * @type: audit message type
1119 * @seq: netlink audit message sequence (serial) number
1120 * @data: payload data
1121 * @datasz: size of payload data
1122 */
1123int audit_rule_change(int type, int seq, void *data, size_t datasz)
1124{
1125 int err = 0;
1126 struct audit_entry *entry;
1127
1128 switch (type) {
1129 case AUDIT_ADD_RULE:
1130 entry = audit_data_to_entry(data, datasz);
1131 if (IS_ERR(entry))
1132 return PTR_ERR(entry);
1133 err = audit_add_rule(entry);
1134 audit_log_rule_change("add_rule", &entry->rule, !err);
1135 break;
1136 case AUDIT_DEL_RULE:
1137 entry = audit_data_to_entry(data, datasz);
1138 if (IS_ERR(entry))
1139 return PTR_ERR(entry);
1140 err = audit_del_rule(entry);
1141 audit_log_rule_change("remove_rule", &entry->rule, !err);
1142 break;
1143 default:
1144 WARN_ON(1);
1145 return -EINVAL;
1146 }
1147
1148 if (err || type == AUDIT_DEL_RULE) {
1149 if (entry->rule.exe)
1150 audit_remove_mark(entry->rule.exe);
1151 audit_free_rule(entry);
1152 }
1153
1154 return err;
1155}
1156
1157/**
1158 * audit_list_rules_send - list the audit rules
1159 * @request_skb: skb of request we are replying to (used to target the reply)
1160 * @seq: netlink audit message sequence (serial) number
1161 */
1162int audit_list_rules_send(struct sk_buff *request_skb, int seq)
1163{
1164 struct task_struct *tsk;
1165 struct audit_netlink_list *dest;
1166
1167 /* We can't just spew out the rules here because we might fill
1168 * the available socket buffer space and deadlock waiting for
1169 * auditctl to read from it... which isn't ever going to
1170 * happen if we're actually running in the context of auditctl
1171 * trying to _send_ the stuff */
1172
1173 dest = kmalloc(sizeof(*dest), GFP_KERNEL);
1174 if (!dest)
1175 return -ENOMEM;
1176 dest->net = get_net(sock_net(NETLINK_CB(request_skb).sk));
1177 dest->portid = NETLINK_CB(request_skb).portid;
1178 skb_queue_head_init(&dest->q);
1179
1180 mutex_lock(&audit_filter_mutex);
1181 audit_list_rules(seq, &dest->q);
1182 mutex_unlock(&audit_filter_mutex);
1183
1184 tsk = kthread_run(audit_send_list_thread, dest, "audit_send_list");
1185 if (IS_ERR(tsk)) {
1186 skb_queue_purge(&dest->q);
1187 put_net(dest->net);
1188 kfree(dest);
1189 return PTR_ERR(tsk);
1190 }
1191
1192 return 0;
1193}
1194
1195int audit_comparator(u32 left, u32 op, u32 right)
1196{
1197 switch (op) {
1198 case Audit_equal:
1199 return (left == right);
1200 case Audit_not_equal:
1201 return (left != right);
1202 case Audit_lt:
1203 return (left < right);
1204 case Audit_le:
1205 return (left <= right);
1206 case Audit_gt:
1207 return (left > right);
1208 case Audit_ge:
1209 return (left >= right);
1210 case Audit_bitmask:
1211 return (left & right);
1212 case Audit_bittest:
1213 return ((left & right) == right);
1214 default:
1215 return 0;
1216 }
1217}
1218
1219int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
1220{
1221 switch (op) {
1222 case Audit_equal:
1223 return uid_eq(left, right);
1224 case Audit_not_equal:
1225 return !uid_eq(left, right);
1226 case Audit_lt:
1227 return uid_lt(left, right);
1228 case Audit_le:
1229 return uid_lte(left, right);
1230 case Audit_gt:
1231 return uid_gt(left, right);
1232 case Audit_ge:
1233 return uid_gte(left, right);
1234 case Audit_bitmask:
1235 case Audit_bittest:
1236 default:
1237 return 0;
1238 }
1239}
1240
1241int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
1242{
1243 switch (op) {
1244 case Audit_equal:
1245 return gid_eq(left, right);
1246 case Audit_not_equal:
1247 return !gid_eq(left, right);
1248 case Audit_lt:
1249 return gid_lt(left, right);
1250 case Audit_le:
1251 return gid_lte(left, right);
1252 case Audit_gt:
1253 return gid_gt(left, right);
1254 case Audit_ge:
1255 return gid_gte(left, right);
1256 case Audit_bitmask:
1257 case Audit_bittest:
1258 default:
1259 return 0;
1260 }
1261}
1262
1263/**
1264 * parent_len - find the length of the parent portion of a pathname
1265 * @path: pathname of which to determine length
1266 */
1267int parent_len(const char *path)
1268{
1269 int plen;
1270 const char *p;
1271
1272 plen = strlen(path);
1273
1274 if (plen == 0)
1275 return plen;
1276
1277 /* disregard trailing slashes */
1278 p = path + plen - 1;
1279 while ((*p == '/') && (p > path))
1280 p--;
1281
1282 /* walk backward until we find the next slash or hit beginning */
1283 while ((*p != '/') && (p > path))
1284 p--;
1285
1286 /* did we find a slash? Then increment to include it in path */
1287 if (*p == '/')
1288 p++;
1289
1290 return p - path;
1291}
1292
1293/**
1294 * audit_compare_dname_path - compare given dentry name with last component in
1295 * given path. Return of 0 indicates a match.
1296 * @dname: dentry name that we're comparing
1297 * @path: full pathname that we're comparing
1298 * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
1299 * here indicates that we must compute this value.
1300 */
1301int audit_compare_dname_path(const struct qstr *dname, const char *path, int parentlen)
1302{
1303 int dlen, pathlen;
1304 const char *p;
1305
1306 dlen = dname->len;
1307 pathlen = strlen(path);
1308 if (pathlen < dlen)
1309 return 1;
1310
1311 parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
1312 if (pathlen - parentlen != dlen)
1313 return 1;
1314
1315 p = path + parentlen;
1316
1317 return strncmp(p, dname->name, dlen);
1318}
1319
1320int audit_filter(int msgtype, unsigned int listtype)
1321{
1322 struct audit_entry *e;
1323 int ret = 1; /* Audit by default */
1324
1325 rcu_read_lock();
1326 list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) {
1327 int i, result = 0;
1328
1329 for (i = 0; i < e->rule.field_count; i++) {
1330 struct audit_field *f = &e->rule.fields[i];
1331 pid_t pid;
1332 u32 sid;
1333
1334 switch (f->type) {
1335 case AUDIT_PID:
1336 pid = task_pid_nr(current);
1337 result = audit_comparator(pid, f->op, f->val);
1338 break;
1339 case AUDIT_UID:
1340 result = audit_uid_comparator(current_uid(), f->op, f->uid);
1341 break;
1342 case AUDIT_GID:
1343 result = audit_gid_comparator(current_gid(), f->op, f->gid);
1344 break;
1345 case AUDIT_LOGINUID:
1346 result = audit_uid_comparator(audit_get_loginuid(current),
1347 f->op, f->uid);
1348 break;
1349 case AUDIT_LOGINUID_SET:
1350 result = audit_comparator(audit_loginuid_set(current),
1351 f->op, f->val);
1352 break;
1353 case AUDIT_MSGTYPE:
1354 result = audit_comparator(msgtype, f->op, f->val);
1355 break;
1356 case AUDIT_SUBJ_USER:
1357 case AUDIT_SUBJ_ROLE:
1358 case AUDIT_SUBJ_TYPE:
1359 case AUDIT_SUBJ_SEN:
1360 case AUDIT_SUBJ_CLR:
1361 if (f->lsm_rule) {
1362 security_task_getsecid(current, &sid);
1363 result = security_audit_rule_match(sid,
1364 f->type, f->op, f->lsm_rule);
1365 }
1366 break;
1367 case AUDIT_EXE:
1368 result = audit_exe_compare(current, e->rule.exe);
1369 if (f->op == Audit_not_equal)
1370 result = !result;
1371 break;
1372 default:
1373 goto unlock_and_return;
1374 }
1375 if (result < 0) /* error */
1376 goto unlock_and_return;
1377 if (!result)
1378 break;
1379 }
1380 if (result > 0) {
1381 if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_EXCLUDE)
1382 ret = 0;
1383 break;
1384 }
1385 }
1386unlock_and_return:
1387 rcu_read_unlock();
1388 return ret;
1389}
1390
1391static int update_lsm_rule(struct audit_krule *r)
1392{
1393 struct audit_entry *entry = container_of(r, struct audit_entry, rule);
1394 struct audit_entry *nentry;
1395 int err = 0;
1396
1397 if (!security_audit_rule_known(r))
1398 return 0;
1399
1400 nentry = audit_dupe_rule(r);
1401 if (entry->rule.exe)
1402 audit_remove_mark(entry->rule.exe);
1403 if (IS_ERR(nentry)) {
1404 /* save the first error encountered for the
1405 * return value */
1406 err = PTR_ERR(nentry);
1407 audit_panic("error updating LSM filters");
1408 if (r->watch)
1409 list_del(&r->rlist);
1410 list_del_rcu(&entry->list);
1411 list_del(&r->list);
1412 } else {
1413 if (r->watch || r->tree)
1414 list_replace_init(&r->rlist, &nentry->rule.rlist);
1415 list_replace_rcu(&entry->list, &nentry->list);
1416 list_replace(&r->list, &nentry->rule.list);
1417 }
1418 call_rcu(&entry->rcu, audit_free_rule_rcu);
1419
1420 return err;
1421}
1422
1423/* This function will re-initialize the lsm_rule field of all applicable rules.
1424 * It will traverse the filter lists serarching for rules that contain LSM
1425 * specific filter fields. When such a rule is found, it is copied, the
1426 * LSM field is re-initialized, and the old rule is replaced with the
1427 * updated rule. */
1428int audit_update_lsm_rules(void)
1429{
1430 struct audit_krule *r, *n;
1431 int i, err = 0;
1432
1433 /* audit_filter_mutex synchronizes the writers */
1434 mutex_lock(&audit_filter_mutex);
1435
1436 for (i = 0; i < AUDIT_NR_FILTERS; i++) {
1437 list_for_each_entry_safe(r, n, &audit_rules_list[i], list) {
1438 int res = update_lsm_rule(r);
1439 if (!err)
1440 err = res;
1441 }
1442 }
1443 mutex_unlock(&audit_filter_mutex);
1444
1445 return err;
1446}