blob: d7a807e814514cea81694bb73667b7b34247ab84 [file] [log] [blame]
David Woodhousefe7752b2005-12-15 18:33:52 +00001/* 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
Richard Guy Briggsf952d102014-01-27 17:38:42 -050022#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
David Woodhousefe7752b2005-12-15 18:33:52 +000024#include <linux/kernel.h>
25#include <linux/audit.h>
26#include <linux/kthread.h>
Amy Griffisf368c07d2006-04-07 16:55:56 -040027#include <linux/mutex.h>
28#include <linux/fs.h>
29#include <linux/namei.h>
David Woodhousefe7752b2005-12-15 18:33:52 +000030#include <linux/netlink.h>
Amy Griffisf368c07d2006-04-07 16:55:56 -040031#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Ahmed S. Darwish2a862b32008-03-01 21:54:38 +020033#include <linux/security.h>
Eric W. Biederman48095d92014-02-03 17:25:33 -080034#include <net/net_namespace.h>
Eric W. Biederman6f285b12014-02-28 19:44:55 -080035#include <net/sock.h>
David Woodhousefe7752b2005-12-15 18:33:52 +000036#include "audit.h"
37
Amy Griffisf368c07d2006-04-07 16:55:56 -040038/*
39 * Locking model:
40 *
41 * audit_filter_mutex:
Scott Matheina725131e2015-11-04 08:23:51 -050042 * 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.
Amy Griffisf368c07d2006-04-07 16:55:56 -040049 */
50
Amy Griffisf368c07d2006-04-07 16:55:56 -040051/* Audit filter lists, defined in <linux/audit.h> */
David Woodhousefe7752b2005-12-15 18:33:52 +000052struct 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]),
Richard Guy Briggs42d5e372017-08-23 07:03:39 -040059 LIST_HEAD_INIT(audit_filter_list[6]),
60#if AUDIT_NR_FILTERS != 7
David Woodhousefe7752b2005-12-15 18:33:52 +000061#error Fix audit_filter_list initialiser
62#endif
63};
Al Viroe45aa212008-12-15 01:17:50 -050064static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
65 LIST_HEAD_INIT(audit_rules_list[0]),
66 LIST_HEAD_INIT(audit_rules_list[1]),
67 LIST_HEAD_INIT(audit_rules_list[2]),
68 LIST_HEAD_INIT(audit_rules_list[3]),
69 LIST_HEAD_INIT(audit_rules_list[4]),
70 LIST_HEAD_INIT(audit_rules_list[5]),
Richard Guy Briggs42d5e372017-08-23 07:03:39 -040071 LIST_HEAD_INIT(audit_rules_list[6]),
Al Viroe45aa212008-12-15 01:17:50 -050072};
David Woodhousefe7752b2005-12-15 18:33:52 +000073
Al Viro74c3cbe2007-07-22 08:04:18 -040074DEFINE_MUTEX(audit_filter_mutex);
Amy Griffisf368c07d2006-04-07 16:55:56 -040075
Richard Guy Briggs219ca392014-03-26 07:26:47 -040076static void audit_free_lsm_field(struct audit_field *f)
77{
78 switch (f->type) {
79 case AUDIT_SUBJ_USER:
80 case AUDIT_SUBJ_ROLE:
81 case AUDIT_SUBJ_TYPE:
82 case AUDIT_SUBJ_SEN:
83 case AUDIT_SUBJ_CLR:
84 case AUDIT_OBJ_USER:
85 case AUDIT_OBJ_ROLE:
86 case AUDIT_OBJ_TYPE:
87 case AUDIT_OBJ_LEV_LOW:
88 case AUDIT_OBJ_LEV_HIGH:
89 kfree(f->lsm_str);
90 security_audit_rule_free(f->lsm_rule);
91 }
92}
93
Amy Griffis93315ed2006-02-07 12:05:27 -050094static inline void audit_free_rule(struct audit_entry *e)
David Woodhousefe7752b2005-12-15 18:33:52 +000095{
Darrel Goeddel3dc7e312006-03-10 18:14:06 -060096 int i;
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +080097 struct audit_krule *erule = &e->rule;
Eric Parisae7b8f42009-12-17 20:12:04 -050098
Amy Griffisf368c07d2006-04-07 16:55:56 -040099 /* some rules don't have associated watches */
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +0800100 if (erule->watch)
101 audit_put_watch(erule->watch);
102 if (erule->fields)
Richard Guy Briggs219ca392014-03-26 07:26:47 -0400103 for (i = 0; i < erule->field_count; i++)
104 audit_free_lsm_field(&erule->fields[i]);
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +0800105 kfree(erule->fields);
106 kfree(erule->filterkey);
Amy Griffis93315ed2006-02-07 12:05:27 -0500107 kfree(e);
David Woodhousefe7752b2005-12-15 18:33:52 +0000108}
109
Al Viro74c3cbe2007-07-22 08:04:18 -0400110void audit_free_rule_rcu(struct rcu_head *head)
Amy Griffis93315ed2006-02-07 12:05:27 -0500111{
112 struct audit_entry *e = container_of(head, struct audit_entry, rcu);
113 audit_free_rule(e);
114}
115
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600116/* Initialize an audit filterlist entry. */
117static inline struct audit_entry *audit_init_entry(u32 field_count)
118{
119 struct audit_entry *entry;
120 struct audit_field *fields;
121
122 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
123 if (unlikely(!entry))
124 return NULL;
125
Fabian Frederickbab5e2d2014-08-06 16:03:22 -0700126 fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600127 if (unlikely(!fields)) {
128 kfree(entry);
129 return NULL;
130 }
131 entry->rule.fields = fields;
132
133 return entry;
134}
135
Amy Griffis93315ed2006-02-07 12:05:27 -0500136/* Unpack a filter field's string representation from user-space
137 * buffer. */
Al Viro74c3cbe2007-07-22 08:04:18 -0400138char *audit_unpack_string(void **bufp, size_t *remain, size_t len)
Amy Griffis93315ed2006-02-07 12:05:27 -0500139{
140 char *str;
141
142 if (!*bufp || (len == 0) || (len > *remain))
143 return ERR_PTR(-EINVAL);
144
145 /* Of the currently implemented string fields, PATH_MAX
146 * defines the longest valid length.
147 */
148 if (len > PATH_MAX)
149 return ERR_PTR(-ENAMETOOLONG);
150
151 str = kmalloc(len + 1, GFP_KERNEL);
152 if (unlikely(!str))
153 return ERR_PTR(-ENOMEM);
154
155 memcpy(str, *bufp, len);
156 str[len] = 0;
157 *bufp += len;
158 *remain -= len;
159
160 return str;
161}
162
Wei Yuanfd976462016-02-06 15:39:47 +0800163/* Translate an inode field to kernel representation. */
Amy Griffisf368c07d2006-04-07 16:55:56 -0400164static inline int audit_to_inode(struct audit_krule *krule,
165 struct audit_field *f)
166{
167 if (krule->listnr != AUDIT_FILTER_EXIT ||
Richard Guy Briggs3639f172014-10-02 22:05:18 -0400168 krule->inode_f || krule->watch || krule->tree ||
Al Viro5af75d82008-12-16 05:59:26 -0500169 (f->op != Audit_equal && f->op != Audit_not_equal))
Amy Griffisf368c07d2006-04-07 16:55:56 -0400170 return -EINVAL;
171
172 krule->inode_f = f;
173 return 0;
174}
175
Al Virob9155432006-07-01 03:56:16 -0400176static __u32 *classes[AUDIT_SYSCALL_CLASSES];
177
178int __init audit_register_class(int class, unsigned *list)
179{
Fabian Frederickbab5e2d2014-08-06 16:03:22 -0700180 __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL);
Al Virob9155432006-07-01 03:56:16 -0400181 if (!p)
182 return -ENOMEM;
183 while (*list != ~0U) {
184 unsigned n = *list++;
185 if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
186 kfree(p);
187 return -EINVAL;
188 }
189 p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
190 }
191 if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
192 kfree(p);
193 return -EINVAL;
194 }
195 classes[class] = p;
196 return 0;
197}
198
Al Viro55669bf2006-08-31 19:26:40 -0400199int audit_match_class(int class, unsigned syscall)
200{
Klaus Weidnerc926e4f2007-05-16 17:45:42 -0500201 if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32))
Al Viro55669bf2006-08-31 19:26:40 -0400202 return 0;
203 if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class]))
204 return 0;
205 return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall);
206}
207
Al Viro327b9ee2007-05-15 20:37:10 +0100208#ifdef CONFIG_AUDITSYSCALL
Amy Griffise54dc242007-03-29 18:01:04 -0400209static inline int audit_match_class_bits(int class, u32 *mask)
210{
211 int i;
212
213 if (classes[class]) {
214 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
215 if (mask[i] & classes[class][i])
216 return 0;
217 }
218 return 1;
219}
220
221static int audit_match_signal(struct audit_entry *entry)
222{
223 struct audit_field *arch = entry->rule.arch_f;
224
225 if (!arch) {
226 /* When arch is unspecified, we must check both masks on biarch
227 * as syscall number alone is ambiguous. */
228 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
229 entry->rule.mask) &&
230 audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
231 entry->rule.mask));
232 }
233
234 switch(audit_classify_arch(arch->val)) {
235 case 0: /* native */
236 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL,
237 entry->rule.mask));
238 case 1: /* 32bit on biarch */
239 return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32,
240 entry->rule.mask));
241 default:
242 return 1;
243 }
244}
Al Viro327b9ee2007-05-15 20:37:10 +0100245#endif
Amy Griffise54dc242007-03-29 18:01:04 -0400246
Amy Griffis93315ed2006-02-07 12:05:27 -0500247/* Common user-space to kernel rule translation. */
Eric Paris56c49112014-04-02 15:46:42 -0400248static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
Amy Griffis93315ed2006-02-07 12:05:27 -0500249{
250 unsigned listnr;
251 struct audit_entry *entry;
Amy Griffis93315ed2006-02-07 12:05:27 -0500252 int i, err;
253
254 err = -EINVAL;
255 listnr = rule->flags & ~AUDIT_FILTER_PREPEND;
256 switch(listnr) {
257 default:
258 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500259#ifdef CONFIG_AUDITSYSCALL
260 case AUDIT_FILTER_ENTRY:
Richard Guy Briggs5260ecc2018-02-14 21:47:43 -0500261 pr_err("AUDIT_FILTER_ENTRY is deprecated\n");
262 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500263 case AUDIT_FILTER_EXIT:
264 case AUDIT_FILTER_TASK:
265#endif
Eric Paris7ff68e52012-01-03 14:23:07 -0500266 case AUDIT_FILTER_USER:
267 case AUDIT_FILTER_TYPE:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400268 case AUDIT_FILTER_FS:
Amy Griffis93315ed2006-02-07 12:05:27 -0500269 ;
270 }
Al Viro014149c2006-05-23 01:36:13 -0400271 if (unlikely(rule->action == AUDIT_POSSIBLE)) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500272 pr_err("AUDIT_POSSIBLE is deprecated\n");
Al Viro014149c2006-05-23 01:36:13 -0400273 goto exit_err;
274 }
275 if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
Amy Griffis93315ed2006-02-07 12:05:27 -0500276 goto exit_err;
277 if (rule->field_count > AUDIT_MAX_FIELDS)
278 goto exit_err;
279
280 err = -ENOMEM;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600281 entry = audit_init_entry(rule->field_count);
282 if (!entry)
Amy Griffis93315ed2006-02-07 12:05:27 -0500283 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500284
285 entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND;
286 entry->rule.listnr = listnr;
287 entry->rule.action = rule->action;
288 entry->rule.field_count = rule->field_count;
Amy Griffis93315ed2006-02-07 12:05:27 -0500289
290 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
291 entry->rule.mask[i] = rule->mask[i];
292
Al Virob9155432006-07-01 03:56:16 -0400293 for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
294 int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
295 __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
296 __u32 *class;
297
298 if (!(*p & AUDIT_BIT(bit)))
299 continue;
300 *p &= ~AUDIT_BIT(bit);
301 class = classes[i];
302 if (class) {
303 int j;
304 for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
305 entry->rule.mask[j] |= class[j];
306 }
307 }
308
Amy Griffis93315ed2006-02-07 12:05:27 -0500309 return entry;
310
311exit_err:
312 return ERR_PTR(err);
313}
314
Al Viro5af75d82008-12-16 05:59:26 -0500315static u32 audit_ops[] =
316{
317 [Audit_equal] = AUDIT_EQUAL,
318 [Audit_not_equal] = AUDIT_NOT_EQUAL,
319 [Audit_bitmask] = AUDIT_BIT_MASK,
320 [Audit_bittest] = AUDIT_BIT_TEST,
321 [Audit_lt] = AUDIT_LESS_THAN,
322 [Audit_gt] = AUDIT_GREATER_THAN,
323 [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL,
324 [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL,
325};
326
327static u32 audit_to_op(u32 op)
328{
329 u32 n;
330 for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++)
331 ;
332 return n;
333}
334
Eric Parisab61d382013-04-16 17:26:51 -0400335/* check if an audit field is valid */
Eric Paris62062cf2013-04-16 13:08:43 -0400336static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
Amy Griffis93315ed2006-02-07 12:05:27 -0500337{
Eric Paris62062cf2013-04-16 13:08:43 -0400338 switch(f->type) {
339 case AUDIT_MSGTYPE:
340 if (entry->rule.listnr != AUDIT_FILTER_TYPE &&
341 entry->rule.listnr != AUDIT_FILTER_USER)
342 return -EINVAL;
343 break;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400344 case AUDIT_FSTYPE:
345 if (entry->rule.listnr != AUDIT_FILTER_FS)
346 return -EINVAL;
347 break;
348 }
349
350 switch(entry->rule.listnr) {
351 case AUDIT_FILTER_FS:
352 switch(f->type) {
353 case AUDIT_FSTYPE:
354 case AUDIT_FILTERKEY:
355 break;
356 default:
357 return -EINVAL;
358 }
Nicholas Mc Guireb7a84de2017-05-02 10:16:03 -0400359 }
Amy Griffis93315ed2006-02-07 12:05:27 -0500360
Eric Parisab61d382013-04-16 17:26:51 -0400361 switch(f->type) {
362 default:
363 return -EINVAL;
364 case AUDIT_UID:
365 case AUDIT_EUID:
366 case AUDIT_SUID:
367 case AUDIT_FSUID:
368 case AUDIT_LOGINUID:
369 case AUDIT_OBJ_UID:
370 case AUDIT_GID:
371 case AUDIT_EGID:
372 case AUDIT_SGID:
373 case AUDIT_FSGID:
374 case AUDIT_OBJ_GID:
375 case AUDIT_PID:
376 case AUDIT_PERS:
377 case AUDIT_MSGTYPE:
378 case AUDIT_PPID:
379 case AUDIT_DEVMAJOR:
380 case AUDIT_DEVMINOR:
381 case AUDIT_EXIT:
382 case AUDIT_SUCCESS:
Eric Paris78122032013-09-04 15:01:43 -0400383 case AUDIT_INODE:
Richard Guy Briggs8fae4772016-11-20 16:47:55 -0500384 case AUDIT_SESSIONID:
Eric Parisab61d382013-04-16 17:26:51 -0400385 /* bit ops are only useful on syscall args */
386 if (f->op == Audit_bitmask || f->op == Audit_bittest)
387 return -EINVAL;
388 break;
389 case AUDIT_ARG0:
390 case AUDIT_ARG1:
391 case AUDIT_ARG2:
392 case AUDIT_ARG3:
393 case AUDIT_SUBJ_USER:
394 case AUDIT_SUBJ_ROLE:
395 case AUDIT_SUBJ_TYPE:
396 case AUDIT_SUBJ_SEN:
397 case AUDIT_SUBJ_CLR:
398 case AUDIT_OBJ_USER:
399 case AUDIT_OBJ_ROLE:
400 case AUDIT_OBJ_TYPE:
401 case AUDIT_OBJ_LEV_LOW:
402 case AUDIT_OBJ_LEV_HIGH:
403 case AUDIT_WATCH:
404 case AUDIT_DIR:
405 case AUDIT_FILTERKEY:
406 break;
Eric W. Biederman780a7652013-04-09 02:22:10 -0700407 case AUDIT_LOGINUID_SET:
408 if ((f->val != 0) && (f->val != 1))
409 return -EINVAL;
410 /* FALL THROUGH */
Eric Parisab61d382013-04-16 17:26:51 -0400411 case AUDIT_ARCH:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400412 case AUDIT_FSTYPE:
Eric Parisab61d382013-04-16 17:26:51 -0400413 if (f->op != Audit_not_equal && f->op != Audit_equal)
414 return -EINVAL;
415 break;
416 case AUDIT_PERM:
417 if (f->val & ~15)
418 return -EINVAL;
419 break;
420 case AUDIT_FILETYPE:
421 if (f->val & ~S_IFMT)
422 return -EINVAL;
423 break;
424 case AUDIT_FIELD_COMPARE:
425 if (f->val > AUDIT_MAX_FIELD_COMPARE)
426 return -EINVAL;
427 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400428 case AUDIT_EXE:
429 if (f->op != Audit_equal)
430 return -EINVAL;
431 if (entry->rule.listnr != AUDIT_FILTER_EXIT)
432 return -EINVAL;
433 break;
Nicholas Mc Guireb7a84de2017-05-02 10:16:03 -0400434 }
Eric Paris62062cf2013-04-16 13:08:43 -0400435 return 0;
Amy Griffis93315ed2006-02-07 12:05:27 -0500436}
437
Wei Yuanfd976462016-02-06 15:39:47 +0800438/* Translate struct audit_rule_data to kernel's rule representation. */
Amy Griffis93315ed2006-02-07 12:05:27 -0500439static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
440 size_t datasz)
441{
442 int err = 0;
443 struct audit_entry *entry;
444 void *bufp;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600445 size_t remain = datasz - sizeof(struct audit_rule_data);
Amy Griffis93315ed2006-02-07 12:05:27 -0500446 int i;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600447 char *str;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400448 struct audit_fsnotify_mark *audit_mark;
Amy Griffis93315ed2006-02-07 12:05:27 -0500449
Eric Paris56c49112014-04-02 15:46:42 -0400450 entry = audit_to_entry_common(data);
Amy Griffis93315ed2006-02-07 12:05:27 -0500451 if (IS_ERR(entry))
452 goto exit_nofree;
453
454 bufp = data->buf;
Amy Griffis93315ed2006-02-07 12:05:27 -0500455 for (i = 0; i < data->field_count; i++) {
456 struct audit_field *f = &entry->rule.fields[i];
457
458 err = -EINVAL;
Al Viro5af75d82008-12-16 05:59:26 -0500459
460 f->op = audit_to_op(data->fieldflags[i]);
461 if (f->op == Audit_bad)
Amy Griffis93315ed2006-02-07 12:05:27 -0500462 goto exit_free;
463
Amy Griffis93315ed2006-02-07 12:05:27 -0500464 f->type = data->fields[i];
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600465 f->val = data->values[i];
Eric Paris62062cf2013-04-16 13:08:43 -0400466
Eric W. Biederman780a7652013-04-09 02:22:10 -0700467 /* Support legacy tests for a valid loginuid */
Richard Guy Briggs42f74462013-05-20 15:08:18 -0400468 if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
Eric W. Biederman780a7652013-04-09 02:22:10 -0700469 f->type = AUDIT_LOGINUID_SET;
470 f->val = 0;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500471 entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
Richard Guy Briggsf1dc4862013-12-11 13:52:26 -0500472 }
473
Eric Paris62062cf2013-04-16 13:08:43 -0400474 err = audit_field_valid(entry, f);
475 if (err)
476 goto exit_free;
477
478 err = -EINVAL;
Eric Parisab61d382013-04-16 17:26:51 -0400479 switch (f->type) {
Eric W. Biederman780a7652013-04-09 02:22:10 -0700480 case AUDIT_LOGINUID:
Al Viro0a73dcc2006-06-05 08:15:59 -0400481 case AUDIT_UID:
482 case AUDIT_EUID:
483 case AUDIT_SUID:
484 case AUDIT_FSUID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700485 case AUDIT_OBJ_UID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700486 f->uid = make_kuid(current_user_ns(), f->val);
487 if (!uid_valid(f->uid))
488 goto exit_free;
489 break;
Al Viro0a73dcc2006-06-05 08:15:59 -0400490 case AUDIT_GID:
491 case AUDIT_EGID:
492 case AUDIT_SGID:
493 case AUDIT_FSGID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700494 case AUDIT_OBJ_GID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700495 f->gid = make_kgid(current_user_ns(), f->val);
496 if (!gid_valid(f->gid))
497 goto exit_free;
498 break;
Amy Griffise54dc242007-03-29 18:01:04 -0400499 case AUDIT_ARCH:
500 entry->rule.arch_f = f;
501 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500502 case AUDIT_SUBJ_USER:
503 case AUDIT_SUBJ_ROLE:
504 case AUDIT_SUBJ_TYPE:
505 case AUDIT_SUBJ_SEN:
506 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500507 case AUDIT_OBJ_USER:
508 case AUDIT_OBJ_ROLE:
509 case AUDIT_OBJ_TYPE:
510 case AUDIT_OBJ_LEV_LOW:
511 case AUDIT_OBJ_LEV_HIGH:
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600512 str = audit_unpack_string(&bufp, &remain, f->val);
513 if (IS_ERR(str))
514 goto exit_free;
515 entry->rule.buflen += f->val;
516
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200517 err = security_audit_rule_init(f->type, f->op, str,
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000518 (void **)&f->lsm_rule);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600519 /* Keep currently invalid fields around in case they
520 * become valid after a policy reload. */
521 if (err == -EINVAL) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500522 pr_warn("audit rule for LSM \'%s\' is invalid\n",
523 str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600524 err = 0;
525 }
526 if (err) {
527 kfree(str);
528 goto exit_free;
529 } else
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000530 f->lsm_str = str;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600531 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400532 case AUDIT_WATCH:
533 str = audit_unpack_string(&bufp, &remain, f->val);
534 if (IS_ERR(str))
535 goto exit_free;
536 entry->rule.buflen += f->val;
537
538 err = audit_to_watch(&entry->rule, str, f->val, f->op);
539 if (err) {
540 kfree(str);
541 goto exit_free;
542 }
543 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400544 case AUDIT_DIR:
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
550 err = audit_make_tree(&entry->rule, str, f->op);
551 kfree(str);
552 if (err)
553 goto exit_free;
554 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400555 case AUDIT_INODE:
556 err = audit_to_inode(&entry->rule, f);
557 if (err)
558 goto exit_free;
559 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400560 case AUDIT_FILTERKEY:
Amy Griffis5adc8a62006-06-14 18:45:21 -0400561 if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN)
562 goto exit_free;
563 str = audit_unpack_string(&bufp, &remain, f->val);
564 if (IS_ERR(str))
565 goto exit_free;
566 entry->rule.buflen += f->val;
567 entry->rule.filterkey = str;
568 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400569 case AUDIT_EXE:
570 if (entry->rule.exe || f->val > PATH_MAX)
571 goto exit_free;
572 str = audit_unpack_string(&bufp, &remain, f->val);
573 if (IS_ERR(str)) {
574 err = PTR_ERR(str);
575 goto exit_free;
576 }
577 entry->rule.buflen += f->val;
578
579 audit_mark = audit_alloc_mark(&entry->rule, str, f->val);
580 if (IS_ERR(audit_mark)) {
581 kfree(str);
582 err = PTR_ERR(audit_mark);
583 goto exit_free;
584 }
585 entry->rule.exe = audit_mark;
586 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400587 }
588 }
589
Al Viro5af75d82008-12-16 05:59:26 -0500590 if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
591 entry->rule.inode_f = NULL;
Amy Griffis93315ed2006-02-07 12:05:27 -0500592
593exit_nofree:
594 return entry;
595
596exit_free:
Chen Gang373e0f32013-04-29 15:05:18 -0700597 if (entry->rule.tree)
598 audit_put_tree(entry->rule.tree); /* that's the temporary one */
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400599 if (entry->rule.exe)
600 audit_remove_mark(entry->rule.exe); /* that's the template one */
Amy Griffis93315ed2006-02-07 12:05:27 -0500601 audit_free_rule(entry);
602 return ERR_PTR(err);
603}
604
605/* Pack a filter field's string representation into data block. */
Al Viro74c3cbe2007-07-22 08:04:18 -0400606static inline size_t audit_pack_string(void **bufp, const char *str)
Amy Griffis93315ed2006-02-07 12:05:27 -0500607{
608 size_t len = strlen(str);
609
610 memcpy(*bufp, str, len);
611 *bufp += len;
612
613 return len;
614}
615
Wei Yuanfd976462016-02-06 15:39:47 +0800616/* Translate kernel rule representation to struct audit_rule_data. */
Amy Griffis93315ed2006-02-07 12:05:27 -0500617static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
618{
619 struct audit_rule_data *data;
620 void *bufp;
621 int i;
622
623 data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
624 if (unlikely(!data))
Amy Griffis0a3b4832006-05-02 15:06:01 -0400625 return NULL;
Amy Griffis93315ed2006-02-07 12:05:27 -0500626 memset(data, 0, sizeof(*data));
627
628 data->flags = krule->flags | krule->listnr;
629 data->action = krule->action;
630 data->field_count = krule->field_count;
631 bufp = data->buf;
632 for (i = 0; i < data->field_count; i++) {
633 struct audit_field *f = &krule->fields[i];
634
635 data->fields[i] = f->type;
Al Viro5af75d82008-12-16 05:59:26 -0500636 data->fieldflags[i] = audit_ops[f->op];
Amy Griffis93315ed2006-02-07 12:05:27 -0500637 switch(f->type) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500638 case AUDIT_SUBJ_USER:
639 case AUDIT_SUBJ_ROLE:
640 case AUDIT_SUBJ_TYPE:
641 case AUDIT_SUBJ_SEN:
642 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500643 case AUDIT_OBJ_USER:
644 case AUDIT_OBJ_ROLE:
645 case AUDIT_OBJ_TYPE:
646 case AUDIT_OBJ_LEV_LOW:
647 case AUDIT_OBJ_LEV_HIGH:
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600648 data->buflen += data->values[i] =
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000649 audit_pack_string(&bufp, f->lsm_str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600650 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400651 case AUDIT_WATCH:
652 data->buflen += data->values[i] =
Eric Pariscfcad622009-06-11 14:31:36 -0400653 audit_pack_string(&bufp,
654 audit_watch_path(krule->watch));
Amy Griffisf368c07d2006-04-07 16:55:56 -0400655 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400656 case AUDIT_DIR:
657 data->buflen += data->values[i] =
658 audit_pack_string(&bufp,
659 audit_tree_path(krule->tree));
660 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400661 case AUDIT_FILTERKEY:
662 data->buflen += data->values[i] =
663 audit_pack_string(&bufp, krule->filterkey);
664 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400665 case AUDIT_EXE:
666 data->buflen += data->values[i] =
667 audit_pack_string(&bufp, audit_mark_path(krule->exe));
668 break;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500669 case AUDIT_LOGINUID_SET:
670 if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) {
671 data->fields[i] = AUDIT_LOGINUID;
672 data->values[i] = AUDIT_UID_UNSET;
673 break;
674 }
675 /* fallthrough if set */
Amy Griffis93315ed2006-02-07 12:05:27 -0500676 default:
677 data->values[i] = f->val;
678 }
679 }
680 for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i];
681
682 return data;
683}
684
685/* Compare two rules in kernel format. Considered success if rules
686 * don't match. */
687static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
David Woodhousefe7752b2005-12-15 18:33:52 +0000688{
689 int i;
690
Amy Griffis93315ed2006-02-07 12:05:27 -0500691 if (a->flags != b->flags ||
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500692 a->pflags != b->pflags ||
Amy Griffis93315ed2006-02-07 12:05:27 -0500693 a->listnr != b->listnr ||
694 a->action != b->action ||
695 a->field_count != b->field_count)
David Woodhousefe7752b2005-12-15 18:33:52 +0000696 return 1;
697
698 for (i = 0; i < a->field_count; i++) {
Amy Griffis93315ed2006-02-07 12:05:27 -0500699 if (a->fields[i].type != b->fields[i].type ||
700 a->fields[i].op != b->fields[i].op)
David Woodhousefe7752b2005-12-15 18:33:52 +0000701 return 1;
Amy Griffis93315ed2006-02-07 12:05:27 -0500702
703 switch(a->fields[i].type) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500704 case AUDIT_SUBJ_USER:
705 case AUDIT_SUBJ_ROLE:
706 case AUDIT_SUBJ_TYPE:
707 case AUDIT_SUBJ_SEN:
708 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500709 case AUDIT_OBJ_USER:
710 case AUDIT_OBJ_ROLE:
711 case AUDIT_OBJ_TYPE:
712 case AUDIT_OBJ_LEV_LOW:
713 case AUDIT_OBJ_LEV_HIGH:
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000714 if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str))
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600715 return 1;
716 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400717 case AUDIT_WATCH:
Eric Pariscfcad622009-06-11 14:31:36 -0400718 if (strcmp(audit_watch_path(a->watch),
719 audit_watch_path(b->watch)))
Amy Griffisf368c07d2006-04-07 16:55:56 -0400720 return 1;
721 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400722 case AUDIT_DIR:
723 if (strcmp(audit_tree_path(a->tree),
724 audit_tree_path(b->tree)))
725 return 1;
726 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400727 case AUDIT_FILTERKEY:
728 /* both filterkeys exist based on above type compare */
729 if (strcmp(a->filterkey, b->filterkey))
730 return 1;
731 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400732 case AUDIT_EXE:
733 /* both paths exist based on above type compare */
734 if (strcmp(audit_mark_path(a->exe),
735 audit_mark_path(b->exe)))
736 return 1;
737 break;
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700738 case AUDIT_UID:
739 case AUDIT_EUID:
740 case AUDIT_SUID:
741 case AUDIT_FSUID:
742 case AUDIT_LOGINUID:
743 case AUDIT_OBJ_UID:
744 if (!uid_eq(a->fields[i].uid, b->fields[i].uid))
745 return 1;
746 break;
747 case AUDIT_GID:
748 case AUDIT_EGID:
749 case AUDIT_SGID:
750 case AUDIT_FSGID:
751 case AUDIT_OBJ_GID:
752 if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
753 return 1;
754 break;
Amy Griffis93315ed2006-02-07 12:05:27 -0500755 default:
756 if (a->fields[i].val != b->fields[i].val)
757 return 1;
758 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000759 }
760
761 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
762 if (a->mask[i] != b->mask[i])
763 return 1;
764
765 return 0;
766}
767
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000768/* Duplicate LSM field information. The lsm_rule is opaque, so must be
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600769 * re-initialized. */
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200770static inline int audit_dupe_lsm_field(struct audit_field *df,
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600771 struct audit_field *sf)
772{
773 int ret = 0;
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000774 char *lsm_str;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600775
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000776 /* our own copy of lsm_str */
777 lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL);
778 if (unlikely(!lsm_str))
Akinobu Mita3e1fbd12006-12-22 01:10:02 -0800779 return -ENOMEM;
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000780 df->lsm_str = lsm_str;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600781
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000782 /* our own (refreshed) copy of lsm_rule */
783 ret = security_audit_rule_init(df->type, df->op, df->lsm_str,
784 (void **)&df->lsm_rule);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600785 /* Keep currently invalid fields around in case they
786 * become valid after a policy reload. */
787 if (ret == -EINVAL) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500788 pr_warn("audit rule for LSM \'%s\' is invalid\n",
789 df->lsm_str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600790 ret = 0;
791 }
792
793 return ret;
794}
795
796/* Duplicate an audit rule. This will be a deep copy with the exception
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200797 * of the watch - that pointer is carried over. The LSM specific fields
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600798 * will be updated in the copy. The point is to be able to replace the old
Amy Griffisf368c07d2006-04-07 16:55:56 -0400799 * rule with the new rule in the filterlist, then free the old rule.
800 * The rlist element is undefined; list manipulations are handled apart from
801 * the initial copy. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500802struct audit_entry *audit_dupe_rule(struct audit_krule *old)
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600803{
804 u32 fcount = old->field_count;
805 struct audit_entry *entry;
806 struct audit_krule *new;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400807 char *fk;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600808 int i, err = 0;
809
810 entry = audit_init_entry(fcount);
811 if (unlikely(!entry))
812 return ERR_PTR(-ENOMEM);
813
814 new = &entry->rule;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600815 new->flags = old->flags;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500816 new->pflags = old->pflags;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600817 new->listnr = old->listnr;
818 new->action = old->action;
819 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
820 new->mask[i] = old->mask[i];
Al Viro0590b932008-12-14 23:45:27 -0500821 new->prio = old->prio;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600822 new->buflen = old->buflen;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400823 new->inode_f = old->inode_f;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600824 new->field_count = old->field_count;
Eric Parisae7b8f42009-12-17 20:12:04 -0500825
Al Viro74c3cbe2007-07-22 08:04:18 -0400826 /*
827 * note that we are OK with not refcounting here; audit_match_tree()
828 * never dereferences tree and we can't get false positives there
829 * since we'd have to have rule gone from the list *and* removed
830 * before the chunks found by lookup had been allocated, i.e. before
831 * the beginning of list scan.
832 */
833 new->tree = old->tree;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600834 memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount);
835
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000836 /* deep copy this information, updating the lsm_rule fields, because
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600837 * the originals will all be freed when the old rule is freed. */
838 for (i = 0; i < fcount; i++) {
839 switch (new->fields[i].type) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500840 case AUDIT_SUBJ_USER:
841 case AUDIT_SUBJ_ROLE:
842 case AUDIT_SUBJ_TYPE:
843 case AUDIT_SUBJ_SEN:
844 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500845 case AUDIT_OBJ_USER:
846 case AUDIT_OBJ_ROLE:
847 case AUDIT_OBJ_TYPE:
848 case AUDIT_OBJ_LEV_LOW:
849 case AUDIT_OBJ_LEV_HIGH:
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200850 err = audit_dupe_lsm_field(&new->fields[i],
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600851 &old->fields[i]);
Amy Griffis5adc8a62006-06-14 18:45:21 -0400852 break;
853 case AUDIT_FILTERKEY:
854 fk = kstrdup(old->filterkey, GFP_KERNEL);
855 if (unlikely(!fk))
856 err = -ENOMEM;
857 else
858 new->filterkey = fk;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400859 break;
860 case AUDIT_EXE:
861 err = audit_dupe_exe(new, old);
862 break;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600863 }
864 if (err) {
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400865 if (new->exe)
866 audit_remove_mark(new->exe);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600867 audit_free_rule(entry);
868 return ERR_PTR(err);
869 }
870 }
871
Eric Parisae7b8f42009-12-17 20:12:04 -0500872 if (old->watch) {
873 audit_get_watch(old->watch);
874 new->watch = old->watch;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400875 }
876
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600877 return entry;
878}
879
Amy Griffisf368c07d2006-04-07 16:55:56 -0400880/* Find an existing audit rule.
881 * Caller must hold audit_filter_mutex to prevent stale rule data. */
882static struct audit_entry *audit_find_rule(struct audit_entry *entry,
Al Viro36c4f1b12008-12-15 01:50:28 -0500883 struct list_head **p)
Amy Griffisf368c07d2006-04-07 16:55:56 -0400884{
885 struct audit_entry *e, *found = NULL;
Al Viro36c4f1b12008-12-15 01:50:28 -0500886 struct list_head *list;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400887 int h;
888
Al Viro36c4f1b12008-12-15 01:50:28 -0500889 if (entry->rule.inode_f) {
890 h = audit_hash_ino(entry->rule.inode_f->val);
891 *p = list = &audit_inode_hash[h];
892 } else if (entry->rule.watch) {
Amy Griffisf368c07d2006-04-07 16:55:56 -0400893 /* we don't know the inode number, so must walk entire hash */
894 for (h = 0; h < AUDIT_INODE_BUCKETS; h++) {
895 list = &audit_inode_hash[h];
896 list_for_each_entry(e, list, list)
897 if (!audit_compare_rule(&entry->rule, &e->rule)) {
898 found = e;
899 goto out;
900 }
901 }
902 goto out;
Al Viro36c4f1b12008-12-15 01:50:28 -0500903 } else {
904 *p = list = &audit_filter_list[entry->rule.listnr];
Amy Griffisf368c07d2006-04-07 16:55:56 -0400905 }
906
907 list_for_each_entry(e, list, list)
908 if (!audit_compare_rule(&entry->rule, &e->rule)) {
909 found = e;
910 goto out;
911 }
912
913out:
914 return found;
915}
916
Al Viro0590b932008-12-14 23:45:27 -0500917static u64 prio_low = ~0ULL/2;
918static u64 prio_high = ~0ULL/2 - 1;
919
Amy Griffisf368c07d2006-04-07 16:55:56 -0400920/* Add rule to given filterlist if not a duplicate. */
Al Viro36c4f1b12008-12-15 01:50:28 -0500921static inline int audit_add_rule(struct audit_entry *entry)
Amy Griffisf368c07d2006-04-07 16:55:56 -0400922{
923 struct audit_entry *e;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400924 struct audit_watch *watch = entry->rule.watch;
Al Viro74c3cbe2007-07-22 08:04:18 -0400925 struct audit_tree *tree = entry->rule.tree;
Al Viro36c4f1b12008-12-15 01:50:28 -0500926 struct list_head *list;
Paul Mooreae9d2fb2015-08-05 11:19:45 -0400927 int err = 0;
Al Viro471a5c72006-07-10 08:29:24 -0400928#ifdef CONFIG_AUDITSYSCALL
929 int dont_count = 0;
930
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400931 /* If any of these, don't count towards total */
932 switch(entry->rule.listnr) {
933 case AUDIT_FILTER_USER:
934 case AUDIT_FILTER_TYPE:
935 case AUDIT_FILTER_FS:
Al Viro471a5c72006-07-10 08:29:24 -0400936 dont_count = 1;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400937 }
Al Viro471a5c72006-07-10 08:29:24 -0400938#endif
Amy Griffisf368c07d2006-04-07 16:55:56 -0400939
Amy Griffisf368c07d2006-04-07 16:55:56 -0400940 mutex_lock(&audit_filter_mutex);
Al Viro36c4f1b12008-12-15 01:50:28 -0500941 e = audit_find_rule(entry, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400942 if (e) {
Eric Paris35fe4d02009-06-11 14:31:36 -0400943 mutex_unlock(&audit_filter_mutex);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400944 err = -EEXIST;
Al Viro74c3cbe2007-07-22 08:04:18 -0400945 /* normally audit_add_tree_rule() will free it on failure */
946 if (tree)
947 audit_put_tree(tree);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400948 return err;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400949 }
950
Amy Griffisf368c07d2006-04-07 16:55:56 -0400951 if (watch) {
952 /* audit_filter_mutex is dropped and re-taken during this call */
Eric Parisae7b8f42009-12-17 20:12:04 -0500953 err = audit_add_watch(&entry->rule, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400954 if (err) {
955 mutex_unlock(&audit_filter_mutex);
Chen Gang2f992ee2013-07-08 15:59:38 -0700956 /*
957 * normally audit_add_tree_rule() will free it
958 * on failure
959 */
960 if (tree)
961 audit_put_tree(tree);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400962 return err;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400963 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000964 }
Al Viro74c3cbe2007-07-22 08:04:18 -0400965 if (tree) {
966 err = audit_add_tree_rule(&entry->rule);
967 if (err) {
968 mutex_unlock(&audit_filter_mutex);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400969 return err;
Al Viro74c3cbe2007-07-22 08:04:18 -0400970 }
971 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000972
Al Viro0590b932008-12-14 23:45:27 -0500973 entry->rule.prio = ~0ULL;
974 if (entry->rule.listnr == AUDIT_FILTER_EXIT) {
975 if (entry->rule.flags & AUDIT_FILTER_PREPEND)
976 entry->rule.prio = ++prio_high;
977 else
978 entry->rule.prio = --prio_low;
979 }
980
David Woodhousefe7752b2005-12-15 18:33:52 +0000981 if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
Al Viroe45aa212008-12-15 01:17:50 -0500982 list_add(&entry->rule.list,
983 &audit_rules_list[entry->rule.listnr]);
David Woodhousefe7752b2005-12-15 18:33:52 +0000984 list_add_rcu(&entry->list, list);
Amy Griffis6a2bcee2006-06-02 13:16:01 -0400985 entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
David Woodhousefe7752b2005-12-15 18:33:52 +0000986 } else {
Al Viroe45aa212008-12-15 01:17:50 -0500987 list_add_tail(&entry->rule.list,
988 &audit_rules_list[entry->rule.listnr]);
David Woodhousefe7752b2005-12-15 18:33:52 +0000989 list_add_tail_rcu(&entry->list, list);
990 }
Al Viro471a5c72006-07-10 08:29:24 -0400991#ifdef CONFIG_AUDITSYSCALL
992 if (!dont_count)
993 audit_n_rules++;
Amy Griffise54dc242007-03-29 18:01:04 -0400994
995 if (!audit_match_signal(entry))
996 audit_signals++;
Al Viro471a5c72006-07-10 08:29:24 -0400997#endif
Amy Griffisf368c07d2006-04-07 16:55:56 -0400998 mutex_unlock(&audit_filter_mutex);
David Woodhousefe7752b2005-12-15 18:33:52 +0000999
Amy Griffisf368c07d2006-04-07 16:55:56 -04001000 return err;
David Woodhousefe7752b2005-12-15 18:33:52 +00001001}
1002
Amy Griffisf368c07d2006-04-07 16:55:56 -04001003/* Remove an existing rule from filterlist. */
Richard Guy Briggs7f492942015-08-05 16:29:36 -04001004int audit_del_rule(struct audit_entry *entry)
David Woodhousefe7752b2005-12-15 18:33:52 +00001005{
1006 struct audit_entry *e;
Al Viro74c3cbe2007-07-22 08:04:18 -04001007 struct audit_tree *tree = entry->rule.tree;
Al Viro36c4f1b12008-12-15 01:50:28 -05001008 struct list_head *list;
Al Viro36c4f1b12008-12-15 01:50:28 -05001009 int ret = 0;
Al Viro471a5c72006-07-10 08:29:24 -04001010#ifdef CONFIG_AUDITSYSCALL
1011 int dont_count = 0;
1012
Richard Guy Briggs42d5e372017-08-23 07:03:39 -04001013 /* If any of these, don't count towards total */
1014 switch(entry->rule.listnr) {
1015 case AUDIT_FILTER_USER:
1016 case AUDIT_FILTER_TYPE:
1017 case AUDIT_FILTER_FS:
Al Viro471a5c72006-07-10 08:29:24 -04001018 dont_count = 1;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -04001019 }
Al Viro471a5c72006-07-10 08:29:24 -04001020#endif
David Woodhousefe7752b2005-12-15 18:33:52 +00001021
Amy Griffisf368c07d2006-04-07 16:55:56 -04001022 mutex_lock(&audit_filter_mutex);
Al Viro36c4f1b12008-12-15 01:50:28 -05001023 e = audit_find_rule(entry, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001024 if (!e) {
Amy Griffisf368c07d2006-04-07 16:55:56 -04001025 ret = -ENOENT;
1026 goto out;
1027 }
1028
Eric Pariscfcad622009-06-11 14:31:36 -04001029 if (e->rule.watch)
Eric Parisa05fb6c2009-12-17 20:12:05 -05001030 audit_remove_watch_rule(&e->rule);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001031
Al Viro74c3cbe2007-07-22 08:04:18 -04001032 if (e->rule.tree)
1033 audit_remove_tree_rule(&e->rule);
1034
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001035 if (e->rule.exe)
1036 audit_remove_mark_rule(&e->rule);
1037
Al Viro471a5c72006-07-10 08:29:24 -04001038#ifdef CONFIG_AUDITSYSCALL
1039 if (!dont_count)
1040 audit_n_rules--;
Amy Griffise54dc242007-03-29 18:01:04 -04001041
1042 if (!audit_match_signal(entry))
1043 audit_signals--;
Al Viro471a5c72006-07-10 08:29:24 -04001044#endif
Richard Guy Briggs8c85fc92015-08-05 15:23:09 -04001045
1046 list_del_rcu(&e->list);
1047 list_del(&e->rule.list);
1048 call_rcu(&e->rcu, audit_free_rule_rcu);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001049
Amy Griffisf368c07d2006-04-07 16:55:56 -04001050out:
Richard Guy Briggs8c85fc92015-08-05 15:23:09 -04001051 mutex_unlock(&audit_filter_mutex);
1052
Al Viro74c3cbe2007-07-22 08:04:18 -04001053 if (tree)
1054 audit_put_tree(tree); /* that's the temporary one */
Amy Griffisf368c07d2006-04-07 16:55:56 -04001055
1056 return ret;
David Woodhousefe7752b2005-12-15 18:33:52 +00001057}
1058
Amy Griffis93315ed2006-02-07 12:05:27 -05001059/* List rules using struct audit_rule_data. */
Paul Moore45a06422017-05-02 10:16:05 -04001060static void audit_list_rules(int seq, struct sk_buff_head *q)
Amy Griffis93315ed2006-02-07 12:05:27 -05001061{
Al Viro9044e6b2006-05-22 01:09:24 -04001062 struct sk_buff *skb;
Al Viroe45aa212008-12-15 01:17:50 -05001063 struct audit_krule *r;
Amy Griffis93315ed2006-02-07 12:05:27 -05001064 int i;
1065
Amy Griffisf368c07d2006-04-07 16:55:56 -04001066 /* This is a blocking read, so use audit_filter_mutex instead of rcu
1067 * iterator to sync with list writers. */
Amy Griffis93315ed2006-02-07 12:05:27 -05001068 for (i=0; i<AUDIT_NR_FILTERS; i++) {
Al Viroe45aa212008-12-15 01:17:50 -05001069 list_for_each_entry(r, &audit_rules_list[i], list) {
Amy Griffis93315ed2006-02-07 12:05:27 -05001070 struct audit_rule_data *data;
1071
Al Viroe45aa212008-12-15 01:17:50 -05001072 data = audit_krule_to_data(r);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001073 if (unlikely(!data))
1074 break;
Paul Moore45a06422017-05-02 10:16:05 -04001075 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1,
1076 data,
Richard Guy Briggsf9441632013-08-14 11:32:45 -04001077 sizeof(*data) + data->buflen);
Al Viro9044e6b2006-05-22 01:09:24 -04001078 if (skb)
1079 skb_queue_tail(q, skb);
Amy Griffis93315ed2006-02-07 12:05:27 -05001080 kfree(data);
1081 }
1082 }
Paul Moore45a06422017-05-02 10:16:05 -04001083 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0);
Al Viro9044e6b2006-05-22 01:09:24 -04001084 if (skb)
1085 skb_queue_tail(q, skb);
Amy Griffis93315ed2006-02-07 12:05:27 -05001086}
1087
Amy Griffis5adc8a62006-06-14 18:45:21 -04001088/* Log rule additions and removals */
Eric Parisdc9eb692013-04-19 13:23:09 -04001089static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
Amy Griffis5adc8a62006-06-14 18:45:21 -04001090{
1091 struct audit_buffer *ab;
Eric Parisdc9eb692013-04-19 13:23:09 -04001092 uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
Eric Paris4440e852013-11-27 17:35:17 -05001093 unsigned int sessionid = audit_get_sessionid(current);
Amy Griffis5adc8a62006-06-14 18:45:21 -04001094
Eric Paris1a6b9f22008-01-07 17:09:31 -05001095 if (!audit_enabled)
1096 return;
1097
Amy Griffis5adc8a62006-06-14 18:45:21 -04001098 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
1099 if (!ab)
1100 return;
Eric Parisdc9eb692013-04-19 13:23:09 -04001101 audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
Eric Parisb122c372013-04-19 15:00:33 -04001102 audit_log_task_context(ab);
Steve Grubbc1e8f062016-11-16 16:14:33 -05001103 audit_log_format(ab, " op=%s", action);
Eric Paris9d960982009-06-11 14:31:37 -04001104 audit_log_key(ab, rule->filterkey);
Amy Griffis5adc8a62006-06-14 18:45:21 -04001105 audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
1106 audit_log_end(ab);
1107}
1108
David Woodhousefe7752b2005-12-15 18:33:52 +00001109/**
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001110 * audit_rule_change - apply all rules to the specified message type
David Woodhousefe7752b2005-12-15 18:33:52 +00001111 * @type: audit message type
David Woodhousefe7752b2005-12-15 18:33:52 +00001112 * @seq: netlink audit message sequence (serial) number
1113 * @data: payload data
Amy Griffis93315ed2006-02-07 12:05:27 -05001114 * @datasz: size of payload data
David Woodhousefe7752b2005-12-15 18:33:52 +00001115 */
Paul Moore45a06422017-05-02 10:16:05 -04001116int audit_rule_change(int type, int seq, void *data, size_t datasz)
David Woodhousefe7752b2005-12-15 18:33:52 +00001117{
Amy Griffis93315ed2006-02-07 12:05:27 -05001118 int err = 0;
1119 struct audit_entry *entry;
David Woodhousefe7752b2005-12-15 18:33:52 +00001120
Richard Guy Briggse85322d2014-10-02 22:05:19 -04001121 entry = audit_data_to_entry(data, datasz);
1122 if (IS_ERR(entry))
1123 return PTR_ERR(entry);
1124
David Woodhousefe7752b2005-12-15 18:33:52 +00001125 switch (type) {
Amy Griffis93315ed2006-02-07 12:05:27 -05001126 case AUDIT_ADD_RULE:
Al Viro36c4f1b12008-12-15 01:50:28 -05001127 err = audit_add_rule(entry);
Burn Altinge7df61f2014-04-04 16:00:38 +11001128 audit_log_rule_change("add_rule", &entry->rule, !err);
David Woodhousefe7752b2005-12-15 18:33:52 +00001129 break;
Amy Griffis93315ed2006-02-07 12:05:27 -05001130 case AUDIT_DEL_RULE:
Al Viro36c4f1b12008-12-15 01:50:28 -05001131 err = audit_del_rule(entry);
Burn Altinge7df61f2014-04-04 16:00:38 +11001132 audit_log_rule_change("remove_rule", &entry->rule, !err);
David Woodhousefe7752b2005-12-15 18:33:52 +00001133 break;
1134 default:
Eric Paris739c9502014-10-10 15:05:21 -04001135 err = -EINVAL;
1136 WARN_ON(1);
David Woodhousefe7752b2005-12-15 18:33:52 +00001137 }
1138
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001139 if (err || type == AUDIT_DEL_RULE) {
1140 if (entry->rule.exe)
1141 audit_remove_mark(entry->rule.exe);
Richard Guy Briggse85322d2014-10-02 22:05:19 -04001142 audit_free_rule(entry);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001143 }
Richard Guy Briggse85322d2014-10-02 22:05:19 -04001144
David Woodhousefe7752b2005-12-15 18:33:52 +00001145 return err;
1146}
1147
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001148/**
1149 * audit_list_rules_send - list the audit rules
Eric W. Biedermand211f1772014-03-08 15:31:54 -08001150 * @request_skb: skb of request we are replying to (used to target the reply)
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001151 * @seq: netlink audit message sequence (serial) number
1152 */
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001153int audit_list_rules_send(struct sk_buff *request_skb, int seq)
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001154{
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001155 u32 portid = NETLINK_CB(request_skb).portid;
1156 struct net *net = sock_net(NETLINK_CB(request_skb).sk);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001157 struct task_struct *tsk;
1158 struct audit_netlink_list *dest;
1159 int err = 0;
1160
1161 /* We can't just spew out the rules here because we might fill
1162 * the available socket buffer space and deadlock waiting for
1163 * auditctl to read from it... which isn't ever going to
1164 * happen if we're actually running in the context of auditctl
1165 * trying to _send_ the stuff */
1166
1167 dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL);
1168 if (!dest)
1169 return -ENOMEM;
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001170 dest->net = get_net(net);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001171 dest->portid = portid;
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001172 skb_queue_head_init(&dest->q);
1173
1174 mutex_lock(&audit_filter_mutex);
Paul Moore45a06422017-05-02 10:16:05 -04001175 audit_list_rules(seq, &dest->q);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001176 mutex_unlock(&audit_filter_mutex);
1177
1178 tsk = kthread_run(audit_send_list, dest, "audit_send_list");
1179 if (IS_ERR(tsk)) {
1180 skb_queue_purge(&dest->q);
1181 kfree(dest);
1182 err = PTR_ERR(tsk);
1183 }
1184
1185 return err;
1186}
1187
Al Viro5af75d82008-12-16 05:59:26 -05001188int audit_comparator(u32 left, u32 op, u32 right)
David Woodhousefe7752b2005-12-15 18:33:52 +00001189{
1190 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05001191 case Audit_equal:
David Woodhousefe7752b2005-12-15 18:33:52 +00001192 return (left == right);
Al Viro5af75d82008-12-16 05:59:26 -05001193 case Audit_not_equal:
David Woodhousefe7752b2005-12-15 18:33:52 +00001194 return (left != right);
Al Viro5af75d82008-12-16 05:59:26 -05001195 case Audit_lt:
David Woodhousefe7752b2005-12-15 18:33:52 +00001196 return (left < right);
Al Viro5af75d82008-12-16 05:59:26 -05001197 case Audit_le:
David Woodhousefe7752b2005-12-15 18:33:52 +00001198 return (left <= right);
Al Viro5af75d82008-12-16 05:59:26 -05001199 case Audit_gt:
David Woodhousefe7752b2005-12-15 18:33:52 +00001200 return (left > right);
Al Viro5af75d82008-12-16 05:59:26 -05001201 case Audit_ge:
David Woodhousefe7752b2005-12-15 18:33:52 +00001202 return (left >= right);
Al Viro5af75d82008-12-16 05:59:26 -05001203 case Audit_bitmask:
Eric Paris74f23452007-06-04 17:00:14 -04001204 return (left & right);
Al Viro5af75d82008-12-16 05:59:26 -05001205 case Audit_bittest:
Eric Paris74f23452007-06-04 17:00:14 -04001206 return ((left & right) == right);
Al Viro5af75d82008-12-16 05:59:26 -05001207 default:
1208 BUG();
1209 return 0;
David Woodhousefe7752b2005-12-15 18:33:52 +00001210 }
1211}
1212
Eric W. Biedermanca57ec02012-09-11 02:18:08 -07001213int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
1214{
1215 switch (op) {
1216 case Audit_equal:
1217 return uid_eq(left, right);
1218 case Audit_not_equal:
1219 return !uid_eq(left, right);
1220 case Audit_lt:
1221 return uid_lt(left, right);
1222 case Audit_le:
1223 return uid_lte(left, right);
1224 case Audit_gt:
1225 return uid_gt(left, right);
1226 case Audit_ge:
1227 return uid_gte(left, right);
1228 case Audit_bitmask:
1229 case Audit_bittest:
1230 default:
1231 BUG();
1232 return 0;
1233 }
1234}
1235
1236int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
1237{
1238 switch (op) {
1239 case Audit_equal:
1240 return gid_eq(left, right);
1241 case Audit_not_equal:
1242 return !gid_eq(left, right);
1243 case Audit_lt:
1244 return gid_lt(left, right);
1245 case Audit_le:
1246 return gid_lte(left, right);
1247 case Audit_gt:
1248 return gid_gt(left, right);
1249 case Audit_ge:
1250 return gid_gte(left, right);
1251 case Audit_bitmask:
1252 case Audit_bittest:
1253 default:
1254 BUG();
1255 return 0;
1256 }
1257}
1258
Jeff Laytonbfcec702012-10-10 15:25:23 -04001259/**
1260 * parent_len - find the length of the parent portion of a pathname
1261 * @path: pathname of which to determine length
1262 */
1263int parent_len(const char *path)
1264{
1265 int plen;
1266 const char *p;
1267
1268 plen = strlen(path);
1269
1270 if (plen == 0)
1271 return plen;
1272
1273 /* disregard trailing slashes */
1274 p = path + plen - 1;
1275 while ((*p == '/') && (p > path))
1276 p--;
1277
1278 /* walk backward until we find the next slash or hit beginning */
1279 while ((*p != '/') && (p > path))
1280 p--;
1281
1282 /* did we find a slash? Then increment to include it in path */
1283 if (*p == '/')
1284 p++;
1285
1286 return p - path;
1287}
1288
Jeff Laytone3d6b072012-10-10 15:25:25 -04001289/**
1290 * audit_compare_dname_path - compare given dentry name with last component in
1291 * given path. Return of 0 indicates a match.
1292 * @dname: dentry name that we're comparing
1293 * @path: full pathname that we're comparing
1294 * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
1295 * here indicates that we must compute this value.
1296 */
1297int audit_compare_dname_path(const char *dname, const char *path, int parentlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001298{
Jeff Laytone3d6b072012-10-10 15:25:25 -04001299 int dlen, pathlen;
Amy Griffisf368c07d2006-04-07 16:55:56 -04001300 const char *p;
David Woodhousefe7752b2005-12-15 18:33:52 +00001301
Amy Griffisf368c07d2006-04-07 16:55:56 -04001302 dlen = strlen(dname);
Eric Paris29e9a342012-10-10 15:25:24 -04001303 pathlen = strlen(path);
1304 if (pathlen < dlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001305 return 1;
1306
Jeff Laytone3d6b072012-10-10 15:25:25 -04001307 parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
Eric Paris29e9a342012-10-10 15:25:24 -04001308 if (pathlen - parentlen != dlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001309 return 1;
Eric Paris29e9a342012-10-10 15:25:24 -04001310
1311 p = path + parentlen;
Amy Griffisf368c07d2006-04-07 16:55:56 -04001312
1313 return strncmp(p, dname, dlen);
1314}
David Woodhousefe7752b2005-12-15 18:33:52 +00001315
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001316int audit_filter(int msgtype, unsigned int listtype)
David Woodhousefe7752b2005-12-15 18:33:52 +00001317{
David Woodhousefe7752b2005-12-15 18:33:52 +00001318 struct audit_entry *e;
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001319 int ret = 1; /* Audit by default */
David Woodhousefe7752b2005-12-15 18:33:52 +00001320
1321 rcu_read_lock();
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001322 if (list_empty(&audit_filter_list[listtype]))
1323 goto unlock_and_return;
1324 list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) {
1325 int i, result = 0;
1326
1327 for (i = 0; i < e->rule.field_count; i++) {
1328 struct audit_field *f = &e->rule.fields[i];
1329 pid_t pid;
1330 u32 sid;
1331
1332 switch (f->type) {
1333 case AUDIT_PID:
1334 pid = task_pid_nr(current);
1335 result = audit_comparator(pid, f->op, f->val);
1336 break;
1337 case AUDIT_UID:
1338 result = audit_uid_comparator(current_uid(), f->op, f->uid);
1339 break;
1340 case AUDIT_GID:
1341 result = audit_gid_comparator(current_gid(), f->op, f->gid);
1342 break;
1343 case AUDIT_LOGINUID:
1344 result = audit_uid_comparator(audit_get_loginuid(current),
1345 f->op, f->uid);
1346 break;
1347 case AUDIT_LOGINUID_SET:
1348 result = audit_comparator(audit_loginuid_set(current),
1349 f->op, f->val);
1350 break;
1351 case AUDIT_MSGTYPE:
1352 result = audit_comparator(msgtype, f->op, f->val);
1353 break;
1354 case AUDIT_SUBJ_USER:
1355 case AUDIT_SUBJ_ROLE:
1356 case AUDIT_SUBJ_TYPE:
1357 case AUDIT_SUBJ_SEN:
1358 case AUDIT_SUBJ_CLR:
1359 if (f->lsm_rule) {
1360 security_task_getsecid(current, &sid);
1361 result = security_audit_rule_match(sid,
1362 f->type, f->op, f->lsm_rule, NULL);
1363 }
1364 break;
1365 default:
1366 goto unlock_and_return;
1367 }
1368 if (result < 0) /* error */
1369 goto unlock_and_return;
1370 if (!result)
1371 break;
1372 }
1373 if (result > 0) {
1374 if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_TYPE)
David Woodhousefe7752b2005-12-15 18:33:52 +00001375 ret = 0;
1376 break;
1377 }
1378 }
David Woodhousefe7752b2005-12-15 18:33:52 +00001379unlock_and_return:
1380 rcu_read_unlock();
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001381 return ret;
David Woodhousefe7752b2005-12-15 18:33:52 +00001382}
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001383
Al Viroe45aa212008-12-15 01:17:50 -05001384static int update_lsm_rule(struct audit_krule *r)
Al Viro1a9d07972008-12-14 12:04:02 -05001385{
Al Viroe45aa212008-12-15 01:17:50 -05001386 struct audit_entry *entry = container_of(r, struct audit_entry, rule);
Al Viro1a9d07972008-12-14 12:04:02 -05001387 struct audit_entry *nentry;
Al Viro1a9d07972008-12-14 12:04:02 -05001388 int err = 0;
1389
Al Viroe45aa212008-12-15 01:17:50 -05001390 if (!security_audit_rule_known(r))
Al Viro1a9d07972008-12-14 12:04:02 -05001391 return 0;
1392
Eric Parisae7b8f42009-12-17 20:12:04 -05001393 nentry = audit_dupe_rule(r);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001394 if (entry->rule.exe)
1395 audit_remove_mark(entry->rule.exe);
Al Viro1a9d07972008-12-14 12:04:02 -05001396 if (IS_ERR(nentry)) {
1397 /* save the first error encountered for the
1398 * return value */
1399 err = PTR_ERR(nentry);
1400 audit_panic("error updating LSM filters");
Eric Parisae7b8f42009-12-17 20:12:04 -05001401 if (r->watch)
Al Viroe45aa212008-12-15 01:17:50 -05001402 list_del(&r->rlist);
Al Viro1a9d07972008-12-14 12:04:02 -05001403 list_del_rcu(&entry->list);
Al Viroe45aa212008-12-15 01:17:50 -05001404 list_del(&r->list);
Al Viro1a9d07972008-12-14 12:04:02 -05001405 } else {
Eric Parisae7b8f42009-12-17 20:12:04 -05001406 if (r->watch || r->tree)
Al Viroe45aa212008-12-15 01:17:50 -05001407 list_replace_init(&r->rlist, &nentry->rule.rlist);
Al Viro1a9d07972008-12-14 12:04:02 -05001408 list_replace_rcu(&entry->list, &nentry->list);
Al Viroe45aa212008-12-15 01:17:50 -05001409 list_replace(&r->list, &nentry->rule.list);
Al Viro1a9d07972008-12-14 12:04:02 -05001410 }
1411 call_rcu(&entry->rcu, audit_free_rule_rcu);
1412
1413 return err;
1414}
1415
Ahmed S. Darwish04305e42008-04-19 09:59:43 +10001416/* This function will re-initialize the lsm_rule field of all applicable rules.
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001417 * It will traverse the filter lists serarching for rules that contain LSM
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001418 * specific filter fields. When such a rule is found, it is copied, the
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001419 * LSM field is re-initialized, and the old rule is replaced with the
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001420 * updated rule. */
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001421int audit_update_lsm_rules(void)
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001422{
Al Viroe45aa212008-12-15 01:17:50 -05001423 struct audit_krule *r, *n;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001424 int i, err = 0;
1425
Amy Griffisf368c07d2006-04-07 16:55:56 -04001426 /* audit_filter_mutex synchronizes the writers */
1427 mutex_lock(&audit_filter_mutex);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001428
1429 for (i = 0; i < AUDIT_NR_FILTERS; i++) {
Al Viroe45aa212008-12-15 01:17:50 -05001430 list_for_each_entry_safe(r, n, &audit_rules_list[i], list) {
1431 int res = update_lsm_rule(r);
Al Viro1a9d07972008-12-14 12:04:02 -05001432 if (!err)
1433 err = res;
1434 }
1435 }
Amy Griffisf368c07d2006-04-07 16:55:56 -04001436 mutex_unlock(&audit_filter_mutex);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001437
1438 return err;
1439}