blob: 333b3bcfc5458fd4b5e45190c90edce17784c46e [file] [log] [blame]
Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001// SPDX-License-Identifier: GPL-2.0-or-later
David Woodhousefe7752b2005-12-15 18:33:52 +00002/* 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
David Woodhousefe7752b2005-12-15 18:33:52 +00007 */
8
Richard Guy Briggsf952d102014-01-27 17:38:42 -05009#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
David Woodhousefe7752b2005-12-15 18:33:52 +000011#include <linux/kernel.h>
12#include <linux/audit.h>
13#include <linux/kthread.h>
Amy Griffisf368c07d2006-04-07 16:55:56 -040014#include <linux/mutex.h>
15#include <linux/fs.h>
16#include <linux/namei.h>
David Woodhousefe7752b2005-12-15 18:33:52 +000017#include <linux/netlink.h>
Amy Griffisf368c07d2006-04-07 16:55:56 -040018#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Ahmed S. Darwish2a862b32008-03-01 21:54:38 +020020#include <linux/security.h>
Eric W. Biederman48095d92014-02-03 17:25:33 -080021#include <net/net_namespace.h>
Eric W. Biederman6f285b12014-02-28 19:44:55 -080022#include <net/sock.h>
David Woodhousefe7752b2005-12-15 18:33:52 +000023#include "audit.h"
24
Amy Griffisf368c07d2006-04-07 16:55:56 -040025/*
26 * Locking model:
27 *
28 * audit_filter_mutex:
Scott Matheina725131e2015-11-04 08:23:51 -050029 * 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.
Amy Griffisf368c07d2006-04-07 16:55:56 -040036 */
37
Amy Griffisf368c07d2006-04-07 16:55:56 -040038/* Audit filter lists, defined in <linux/audit.h> */
David Woodhousefe7752b2005-12-15 18:33:52 +000039struct 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]),
Richard Guy Briggs42d5e372017-08-23 07:03:39 -040046 LIST_HEAD_INIT(audit_filter_list[6]),
47#if AUDIT_NR_FILTERS != 7
David Woodhousefe7752b2005-12-15 18:33:52 +000048#error Fix audit_filter_list initialiser
49#endif
50};
Al Viroe45aa212008-12-15 01:17:50 -050051static 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]),
Richard Guy Briggs42d5e372017-08-23 07:03:39 -040058 LIST_HEAD_INIT(audit_rules_list[6]),
Al Viroe45aa212008-12-15 01:17:50 -050059};
David Woodhousefe7752b2005-12-15 18:33:52 +000060
Al Viro74c3cbe2007-07-22 08:04:18 -040061DEFINE_MUTEX(audit_filter_mutex);
Amy Griffisf368c07d2006-04-07 16:55:56 -040062
Richard Guy Briggs219ca392014-03-26 07:26:47 -040063static 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
Amy Griffis93315ed2006-02-07 12:05:27 -050081static inline void audit_free_rule(struct audit_entry *e)
David Woodhousefe7752b2005-12-15 18:33:52 +000082{
Darrel Goeddel3dc7e312006-03-10 18:14:06 -060083 int i;
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +080084 struct audit_krule *erule = &e->rule;
Eric Parisae7b8f42009-12-17 20:12:04 -050085
Amy Griffisf368c07d2006-04-07 16:55:56 -040086 /* some rules don't have associated watches */
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +080087 if (erule->watch)
88 audit_put_watch(erule->watch);
89 if (erule->fields)
Richard Guy Briggs219ca392014-03-26 07:26:47 -040090 for (i = 0; i < erule->field_count; i++)
91 audit_free_lsm_field(&erule->fields[i]);
Zhenwen Xuc28bb7d2009-03-12 22:16:12 +080092 kfree(erule->fields);
93 kfree(erule->filterkey);
Amy Griffis93315ed2006-02-07 12:05:27 -050094 kfree(e);
David Woodhousefe7752b2005-12-15 18:33:52 +000095}
96
Al Viro74c3cbe2007-07-22 08:04:18 -040097void audit_free_rule_rcu(struct rcu_head *head)
Amy Griffis93315ed2006-02-07 12:05:27 -050098{
99 struct audit_entry *e = container_of(head, struct audit_entry, rcu);
100 audit_free_rule(e);
101}
102
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600103/* 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
Fabian Frederickbab5e2d2014-08-06 16:03:22 -0700113 fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600114 if (unlikely(!fields)) {
115 kfree(entry);
116 return NULL;
117 }
118 entry->rule.fields = fields;
119
120 return entry;
121}
122
Amy Griffis93315ed2006-02-07 12:05:27 -0500123/* Unpack a filter field's string representation from user-space
124 * buffer. */
Al Viro74c3cbe2007-07-22 08:04:18 -0400125char *audit_unpack_string(void **bufp, size_t *remain, size_t len)
Amy Griffis93315ed2006-02-07 12:05:27 -0500126{
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
Wei Yuanfd976462016-02-06 15:39:47 +0800150/* Translate an inode field to kernel representation. */
Amy Griffisf368c07d2006-04-07 16:55:56 -0400151static inline int audit_to_inode(struct audit_krule *krule,
152 struct audit_field *f)
153{
154 if (krule->listnr != AUDIT_FILTER_EXIT ||
Richard Guy Briggs3639f172014-10-02 22:05:18 -0400155 krule->inode_f || krule->watch || krule->tree ||
Al Viro5af75d82008-12-16 05:59:26 -0500156 (f->op != Audit_equal && f->op != Audit_not_equal))
Amy Griffisf368c07d2006-04-07 16:55:56 -0400157 return -EINVAL;
158
159 krule->inode_f = f;
160 return 0;
161}
162
Al Virob9155432006-07-01 03:56:16 -0400163static __u32 *classes[AUDIT_SYSCALL_CLASSES];
164
165int __init audit_register_class(int class, unsigned *list)
166{
Fabian Frederickbab5e2d2014-08-06 16:03:22 -0700167 __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL);
Al Virob9155432006-07-01 03:56:16 -0400168 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
Al Viro55669bf2006-08-31 19:26:40 -0400186int audit_match_class(int class, unsigned syscall)
187{
Klaus Weidnerc926e4f2007-05-16 17:45:42 -0500188 if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32))
Al Viro55669bf2006-08-31 19:26:40 -0400189 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
Al Viro327b9ee2007-05-15 20:37:10 +0100195#ifdef CONFIG_AUDITSYSCALL
Amy Griffise54dc242007-03-29 18:01:04 -0400196static 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}
Al Viro327b9ee2007-05-15 20:37:10 +0100232#endif
Amy Griffise54dc242007-03-29 18:01:04 -0400233
Amy Griffis93315ed2006-02-07 12:05:27 -0500234/* Common user-space to kernel rule translation. */
Eric Paris56c49112014-04-02 15:46:42 -0400235static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
Amy Griffis93315ed2006-02-07 12:05:27 -0500236{
237 unsigned listnr;
238 struct audit_entry *entry;
Amy Griffis93315ed2006-02-07 12:05:27 -0500239 int i, err;
240
241 err = -EINVAL;
242 listnr = rule->flags & ~AUDIT_FILTER_PREPEND;
243 switch(listnr) {
244 default:
245 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500246#ifdef CONFIG_AUDITSYSCALL
247 case AUDIT_FILTER_ENTRY:
Richard Guy Briggs5260ecc2018-02-14 21:47:43 -0500248 pr_err("AUDIT_FILTER_ENTRY is deprecated\n");
249 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500250 case AUDIT_FILTER_EXIT:
251 case AUDIT_FILTER_TASK:
252#endif
Eric Paris7ff68e52012-01-03 14:23:07 -0500253 case AUDIT_FILTER_USER:
Richard Guy Briggsd904ac02018-06-05 11:45:07 -0400254 case AUDIT_FILTER_EXCLUDE:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400255 case AUDIT_FILTER_FS:
Amy Griffis93315ed2006-02-07 12:05:27 -0500256 ;
257 }
Al Viro014149c2006-05-23 01:36:13 -0400258 if (unlikely(rule->action == AUDIT_POSSIBLE)) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500259 pr_err("AUDIT_POSSIBLE is deprecated\n");
Al Viro014149c2006-05-23 01:36:13 -0400260 goto exit_err;
261 }
262 if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
Amy Griffis93315ed2006-02-07 12:05:27 -0500263 goto exit_err;
264 if (rule->field_count > AUDIT_MAX_FIELDS)
265 goto exit_err;
266
267 err = -ENOMEM;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600268 entry = audit_init_entry(rule->field_count);
269 if (!entry)
Amy Griffis93315ed2006-02-07 12:05:27 -0500270 goto exit_err;
Amy Griffis93315ed2006-02-07 12:05:27 -0500271
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;
Amy Griffis93315ed2006-02-07 12:05:27 -0500276
277 for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
278 entry->rule.mask[i] = rule->mask[i];
279
Al Virob9155432006-07-01 03:56:16 -0400280 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
Amy Griffis93315ed2006-02-07 12:05:27 -0500296 return entry;
297
298exit_err:
299 return ERR_PTR(err);
300}
301
Al Viro5af75d82008-12-16 05:59:26 -0500302static 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
Eric Parisab61d382013-04-16 17:26:51 -0400322/* check if an audit field is valid */
Eric Paris62062cf2013-04-16 13:08:43 -0400323static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
Amy Griffis93315ed2006-02-07 12:05:27 -0500324{
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400325 switch (f->type) {
Eric Paris62062cf2013-04-16 13:08:43 -0400326 case AUDIT_MSGTYPE:
Richard Guy Briggsd904ac02018-06-05 11:45:07 -0400327 if (entry->rule.listnr != AUDIT_FILTER_EXCLUDE &&
Eric Paris62062cf2013-04-16 13:08:43 -0400328 entry->rule.listnr != AUDIT_FILTER_USER)
329 return -EINVAL;
330 break;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400331 case AUDIT_FSTYPE:
332 if (entry->rule.listnr != AUDIT_FILTER_FS)
333 return -EINVAL;
334 break;
335 }
336
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400337 switch (entry->rule.listnr) {
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400338 case AUDIT_FILTER_FS:
339 switch(f->type) {
340 case AUDIT_FSTYPE:
341 case AUDIT_FILTERKEY:
342 break;
343 default:
344 return -EINVAL;
345 }
Nicholas Mc Guireb7a84de2017-05-02 10:16:03 -0400346 }
Amy Griffis93315ed2006-02-07 12:05:27 -0500347
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400348 /* 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;
Eric Parisab61d382013-04-16 17:26:51 -0400358 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:
Eric Parisab61d382013-04-16 17:26:51 -0400370 case AUDIT_MSGTYPE:
371 case AUDIT_PPID:
372 case AUDIT_DEVMAJOR:
Eric Parisab61d382013-04-16 17:26:51 -0400373 case AUDIT_EXIT:
374 case AUDIT_SUCCESS:
Eric Paris78122032013-09-04 15:01:43 -0400375 case AUDIT_INODE:
Richard Guy Briggs8fae4772016-11-20 16:47:55 -0500376 case AUDIT_SESSIONID:
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400377 case AUDIT_SUBJ_SEN:
378 case AUDIT_SUBJ_CLR:
379 case AUDIT_OBJ_LEV_LOW:
380 case AUDIT_OBJ_LEV_HIGH:
Richard Guy Briggsbf361232019-05-09 20:01:36 -0400381 case AUDIT_SADDR_FAM:
Eric Parisab61d382013-04-16 17:26:51 -0400382 /* bit ops are only useful on syscall args */
383 if (f->op == Audit_bitmask || f->op == Audit_bittest)
384 return -EINVAL;
385 break;
Eric Parisab61d382013-04-16 17:26:51 -0400386 case AUDIT_SUBJ_USER:
387 case AUDIT_SUBJ_ROLE:
388 case AUDIT_SUBJ_TYPE:
Eric Parisab61d382013-04-16 17:26:51 -0400389 case AUDIT_OBJ_USER:
390 case AUDIT_OBJ_ROLE:
391 case AUDIT_OBJ_TYPE:
Eric Parisab61d382013-04-16 17:26:51 -0400392 case AUDIT_WATCH:
393 case AUDIT_DIR:
394 case AUDIT_FILTERKEY:
Eric W. Biederman780a7652013-04-09 02:22:10 -0700395 case AUDIT_LOGINUID_SET:
Eric Parisab61d382013-04-16 17:26:51 -0400396 case AUDIT_ARCH:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400397 case AUDIT_FSTYPE:
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400398 case AUDIT_PERM:
399 case AUDIT_FILETYPE:
400 case AUDIT_FIELD_COMPARE:
401 case AUDIT_EXE:
402 /* only equal and not equal valid ops */
Eric Parisab61d382013-04-16 17:26:51 -0400403 if (f->op != Audit_not_equal && f->op != Audit_equal)
404 return -EINVAL;
405 break;
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400406 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;
Eric Parisab61d382013-04-16 17:26:51 -0400417 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;
Richard Guy Briggsbf361232019-05-09 20:01:36 -0400429 case AUDIT_SADDR_FAM:
430 if (f->val >= AF_MAX)
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400431 return -EINVAL;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400432 break;
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400433 default:
Eric Parisab61d382013-04-16 17:26:51 -0400434 break;
Nicholas Mc Guireb7a84de2017-05-02 10:16:03 -0400435 }
Richard Guy Briggsecc68902019-05-22 17:51:09 -0400436
Eric Paris62062cf2013-04-16 13:08:43 -0400437 return 0;
Amy Griffis93315ed2006-02-07 12:05:27 -0500438}
439
Wei Yuanfd976462016-02-06 15:39:47 +0800440/* Translate struct audit_rule_data to kernel's rule representation. */
Amy Griffis93315ed2006-02-07 12:05:27 -0500441static 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;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600447 size_t remain = datasz - sizeof(struct audit_rule_data);
Amy Griffis93315ed2006-02-07 12:05:27 -0500448 int i;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600449 char *str;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400450 struct audit_fsnotify_mark *audit_mark;
Amy Griffis93315ed2006-02-07 12:05:27 -0500451
Eric Paris56c49112014-04-02 15:46:42 -0400452 entry = audit_to_entry_common(data);
Amy Griffis93315ed2006-02-07 12:05:27 -0500453 if (IS_ERR(entry))
454 goto exit_nofree;
455
456 bufp = data->buf;
Amy Griffis93315ed2006-02-07 12:05:27 -0500457 for (i = 0; i < data->field_count; i++) {
458 struct audit_field *f = &entry->rule.fields[i];
Paul Moore2ad3e172020-02-22 20:36:47 -0500459 u32 f_val;
Amy Griffis93315ed2006-02-07 12:05:27 -0500460
461 err = -EINVAL;
Al Viro5af75d82008-12-16 05:59:26 -0500462
463 f->op = audit_to_op(data->fieldflags[i]);
464 if (f->op == Audit_bad)
Amy Griffis93315ed2006-02-07 12:05:27 -0500465 goto exit_free;
466
Amy Griffis93315ed2006-02-07 12:05:27 -0500467 f->type = data->fields[i];
Paul Moore2ad3e172020-02-22 20:36:47 -0500468 f_val = data->values[i];
Eric Paris62062cf2013-04-16 13:08:43 -0400469
Eric W. Biederman780a7652013-04-09 02:22:10 -0700470 /* Support legacy tests for a valid loginuid */
Paul Moore2ad3e172020-02-22 20:36:47 -0500471 if ((f->type == AUDIT_LOGINUID) && (f_val == AUDIT_UID_UNSET)) {
Eric W. Biederman780a7652013-04-09 02:22:10 -0700472 f->type = AUDIT_LOGINUID_SET;
Paul Moore2ad3e172020-02-22 20:36:47 -0500473 f_val = 0;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500474 entry->rule.pflags |= AUDIT_LOGINUID_LEGACY;
Richard Guy Briggsf1dc4862013-12-11 13:52:26 -0500475 }
476
Eric Paris62062cf2013-04-16 13:08:43 -0400477 err = audit_field_valid(entry, f);
478 if (err)
479 goto exit_free;
480
481 err = -EINVAL;
Eric Parisab61d382013-04-16 17:26:51 -0400482 switch (f->type) {
Eric W. Biederman780a7652013-04-09 02:22:10 -0700483 case AUDIT_LOGINUID:
Al Viro0a73dcc2006-06-05 08:15:59 -0400484 case AUDIT_UID:
485 case AUDIT_EUID:
486 case AUDIT_SUID:
487 case AUDIT_FSUID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700488 case AUDIT_OBJ_UID:
Paul Moore2ad3e172020-02-22 20:36:47 -0500489 f->uid = make_kuid(current_user_ns(), f_val);
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700490 if (!uid_valid(f->uid))
491 goto exit_free;
492 break;
Al Viro0a73dcc2006-06-05 08:15:59 -0400493 case AUDIT_GID:
494 case AUDIT_EGID:
495 case AUDIT_SGID:
496 case AUDIT_FSGID:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700497 case AUDIT_OBJ_GID:
Paul Moore2ad3e172020-02-22 20:36:47 -0500498 f->gid = make_kgid(current_user_ns(), f_val);
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700499 if (!gid_valid(f->gid))
500 goto exit_free;
501 break;
Amy Griffise54dc242007-03-29 18:01:04 -0400502 case AUDIT_ARCH:
Paul Moore2ad3e172020-02-22 20:36:47 -0500503 f->val = f_val;
Amy Griffise54dc242007-03-29 18:01:04 -0400504 entry->rule.arch_f = f;
505 break;
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500506 case AUDIT_SUBJ_USER:
507 case AUDIT_SUBJ_ROLE:
508 case AUDIT_SUBJ_TYPE:
509 case AUDIT_SUBJ_SEN:
510 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500511 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:
Paul Moore2ad3e172020-02-22 20:36:47 -0500516 str = audit_unpack_string(&bufp, &remain, f_val);
517 if (IS_ERR(str)) {
518 err = PTR_ERR(str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600519 goto exit_free;
Paul Moore2ad3e172020-02-22 20:36:47 -0500520 }
521 entry->rule.buflen += f_val;
522 f->lsm_str = str;
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200523 err = security_audit_rule_init(f->type, f->op, str,
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000524 (void **)&f->lsm_rule);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600525 /* Keep currently invalid fields around in case they
526 * become valid after a policy reload. */
527 if (err == -EINVAL) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500528 pr_warn("audit rule for LSM \'%s\' is invalid\n",
529 str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600530 err = 0;
Paul Moore2ad3e172020-02-22 20:36:47 -0500531 } else if (err)
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600532 goto exit_free;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600533 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400534 case AUDIT_WATCH:
Paul Moore2ad3e172020-02-22 20:36:47 -0500535 str = audit_unpack_string(&bufp, &remain, f_val);
536 if (IS_ERR(str)) {
537 err = PTR_ERR(str);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400538 goto exit_free;
Paul Moore2ad3e172020-02-22 20:36:47 -0500539 }
540 err = audit_to_watch(&entry->rule, str, f_val, f->op);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400541 if (err) {
542 kfree(str);
543 goto exit_free;
544 }
Paul Moore2ad3e172020-02-22 20:36:47 -0500545 entry->rule.buflen += f_val;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400546 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400547 case AUDIT_DIR:
Paul Moore2ad3e172020-02-22 20:36:47 -0500548 str = audit_unpack_string(&bufp, &remain, f_val);
549 if (IS_ERR(str)) {
550 err = PTR_ERR(str);
Al Viro74c3cbe2007-07-22 08:04:18 -0400551 goto exit_free;
Paul Moore2ad3e172020-02-22 20:36:47 -0500552 }
Al Viro74c3cbe2007-07-22 08:04:18 -0400553 err = audit_make_tree(&entry->rule, str, f->op);
554 kfree(str);
555 if (err)
556 goto exit_free;
Paul Moore2ad3e172020-02-22 20:36:47 -0500557 entry->rule.buflen += f_val;
Al Viro74c3cbe2007-07-22 08:04:18 -0400558 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400559 case AUDIT_INODE:
Paul Moore2ad3e172020-02-22 20:36:47 -0500560 f->val = f_val;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400561 err = audit_to_inode(&entry->rule, f);
562 if (err)
563 goto exit_free;
564 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400565 case AUDIT_FILTERKEY:
Paul Moore2ad3e172020-02-22 20:36:47 -0500566 if (entry->rule.filterkey || f_val > AUDIT_MAX_KEY_LEN)
Amy Griffis5adc8a62006-06-14 18:45:21 -0400567 goto exit_free;
Paul Moore2ad3e172020-02-22 20:36:47 -0500568 str = audit_unpack_string(&bufp, &remain, f_val);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400569 if (IS_ERR(str)) {
570 err = PTR_ERR(str);
571 goto exit_free;
572 }
Paul Moore2ad3e172020-02-22 20:36:47 -0500573 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);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400585 if (IS_ERR(audit_mark)) {
586 kfree(str);
587 err = PTR_ERR(audit_mark);
588 goto exit_free;
589 }
Paul Moore2ad3e172020-02-22 20:36:47 -0500590 entry->rule.buflen += f_val;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400591 entry->rule.exe = audit_mark;
592 break;
Paul Moore2ad3e172020-02-22 20:36:47 -0500593 default:
594 f->val = f_val;
595 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400596 }
597 }
598
Al Viro5af75d82008-12-16 05:59:26 -0500599 if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
600 entry->rule.inode_f = NULL;
Amy Griffis93315ed2006-02-07 12:05:27 -0500601
602exit_nofree:
603 return entry;
604
605exit_free:
Chen Gang373e0f32013-04-29 15:05:18 -0700606 if (entry->rule.tree)
607 audit_put_tree(entry->rule.tree); /* that's the temporary one */
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400608 if (entry->rule.exe)
609 audit_remove_mark(entry->rule.exe); /* that's the template one */
Amy Griffis93315ed2006-02-07 12:05:27 -0500610 audit_free_rule(entry);
611 return ERR_PTR(err);
612}
613
614/* Pack a filter field's string representation into data block. */
Al Viro74c3cbe2007-07-22 08:04:18 -0400615static inline size_t audit_pack_string(void **bufp, const char *str)
Amy Griffis93315ed2006-02-07 12:05:27 -0500616{
617 size_t len = strlen(str);
618
619 memcpy(*bufp, str, len);
620 *bufp += len;
621
622 return len;
623}
624
Wei Yuanfd976462016-02-06 15:39:47 +0800625/* Translate kernel rule representation to struct audit_rule_data. */
Amy Griffis93315ed2006-02-07 12:05:27 -0500626static 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))
Amy Griffis0a3b4832006-05-02 15:06:01 -0400634 return NULL;
Amy Griffis93315ed2006-02-07 12:05:27 -0500635 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;
Al Viro5af75d82008-12-16 05:59:26 -0500645 data->fieldflags[i] = audit_ops[f->op];
Amy Griffis93315ed2006-02-07 12:05:27 -0500646 switch(f->type) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500647 case AUDIT_SUBJ_USER:
648 case AUDIT_SUBJ_ROLE:
649 case AUDIT_SUBJ_TYPE:
650 case AUDIT_SUBJ_SEN:
651 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500652 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:
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600657 data->buflen += data->values[i] =
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000658 audit_pack_string(&bufp, f->lsm_str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600659 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400660 case AUDIT_WATCH:
661 data->buflen += data->values[i] =
Eric Pariscfcad622009-06-11 14:31:36 -0400662 audit_pack_string(&bufp,
663 audit_watch_path(krule->watch));
Amy Griffisf368c07d2006-04-07 16:55:56 -0400664 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400665 case AUDIT_DIR:
666 data->buflen += data->values[i] =
667 audit_pack_string(&bufp,
668 audit_tree_path(krule->tree));
669 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400670 case AUDIT_FILTERKEY:
671 data->buflen += data->values[i] =
672 audit_pack_string(&bufp, krule->filterkey);
673 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400674 case AUDIT_EXE:
675 data->buflen += data->values[i] =
676 audit_pack_string(&bufp, audit_mark_path(krule->exe));
677 break;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500678 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 }
Gustavo A. R. Silvadf561f662020-08-23 17:36:59 -0500684 fallthrough; /* if set */
Amy Griffis93315ed2006-02-07 12:05:27 -0500685 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)
David Woodhousefe7752b2005-12-15 18:33:52 +0000697{
698 int i;
699
Amy Griffis93315ed2006-02-07 12:05:27 -0500700 if (a->flags != b->flags ||
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500701 a->pflags != b->pflags ||
Amy Griffis93315ed2006-02-07 12:05:27 -0500702 a->listnr != b->listnr ||
703 a->action != b->action ||
704 a->field_count != b->field_count)
David Woodhousefe7752b2005-12-15 18:33:52 +0000705 return 1;
706
707 for (i = 0; i < a->field_count; i++) {
Amy Griffis93315ed2006-02-07 12:05:27 -0500708 if (a->fields[i].type != b->fields[i].type ||
709 a->fields[i].op != b->fields[i].op)
David Woodhousefe7752b2005-12-15 18:33:52 +0000710 return 1;
Amy Griffis93315ed2006-02-07 12:05:27 -0500711
712 switch(a->fields[i].type) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500713 case AUDIT_SUBJ_USER:
714 case AUDIT_SUBJ_ROLE:
715 case AUDIT_SUBJ_TYPE:
716 case AUDIT_SUBJ_SEN:
717 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500718 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:
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000723 if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str))
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600724 return 1;
725 break;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400726 case AUDIT_WATCH:
Eric Pariscfcad622009-06-11 14:31:36 -0400727 if (strcmp(audit_watch_path(a->watch),
728 audit_watch_path(b->watch)))
Amy Griffisf368c07d2006-04-07 16:55:56 -0400729 return 1;
730 break;
Al Viro74c3cbe2007-07-22 08:04:18 -0400731 case AUDIT_DIR:
732 if (strcmp(audit_tree_path(a->tree),
733 audit_tree_path(b->tree)))
734 return 1;
735 break;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400736 case AUDIT_FILTERKEY:
737 /* both filterkeys exist based on above type compare */
738 if (strcmp(a->filterkey, b->filterkey))
739 return 1;
740 break;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400741 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;
Eric W. Biedermanca57ec02012-09-11 02:18:08 -0700747 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;
Amy Griffis93315ed2006-02-07 12:05:27 -0500764 default:
765 if (a->fields[i].val != b->fields[i].val)
766 return 1;
767 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000768 }
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
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000777/* Duplicate LSM field information. The lsm_rule is opaque, so must be
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600778 * re-initialized. */
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200779static inline int audit_dupe_lsm_field(struct audit_field *df,
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600780 struct audit_field *sf)
781{
782 int ret = 0;
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000783 char *lsm_str;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600784
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000785 /* our own copy of lsm_str */
786 lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL);
787 if (unlikely(!lsm_str))
Akinobu Mita3e1fbd12006-12-22 01:10:02 -0800788 return -ENOMEM;
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000789 df->lsm_str = lsm_str;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600790
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000791 /* 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);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600794 /* Keep currently invalid fields around in case they
795 * become valid after a policy reload. */
796 if (ret == -EINVAL) {
Richard Guy Briggsf952d102014-01-27 17:38:42 -0500797 pr_warn("audit rule for LSM \'%s\' is invalid\n",
798 df->lsm_str);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600799 ret = 0;
800 }
801
802 return ret;
803}
804
805/* Duplicate an audit rule. This will be a deep copy with the exception
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200806 * of the watch - that pointer is carried over. The LSM specific fields
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600807 * will be updated in the copy. The point is to be able to replace the old
Amy Griffisf368c07d2006-04-07 16:55:56 -0400808 * 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. */
Eric Parisae7b8f42009-12-17 20:12:04 -0500811struct audit_entry *audit_dupe_rule(struct audit_krule *old)
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600812{
813 u32 fcount = old->field_count;
814 struct audit_entry *entry;
815 struct audit_krule *new;
Amy Griffis5adc8a62006-06-14 18:45:21 -0400816 char *fk;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600817 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;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600824 new->flags = old->flags;
Richard Guy Briggs041d7b92014-12-23 13:02:04 -0500825 new->pflags = old->pflags;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600826 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];
Al Viro0590b932008-12-14 23:45:27 -0500830 new->prio = old->prio;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600831 new->buflen = old->buflen;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400832 new->inode_f = old->inode_f;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600833 new->field_count = old->field_count;
Eric Parisae7b8f42009-12-17 20:12:04 -0500834
Al Viro74c3cbe2007-07-22 08:04:18 -0400835 /*
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;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600843 memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount);
844
Ahmed S. Darwish04305e42008-04-19 09:59:43 +1000845 /* deep copy this information, updating the lsm_rule fields, because
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600846 * 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) {
Darrel Goeddel3a6b9f82006-06-29 16:56:39 -0500849 case AUDIT_SUBJ_USER:
850 case AUDIT_SUBJ_ROLE:
851 case AUDIT_SUBJ_TYPE:
852 case AUDIT_SUBJ_SEN:
853 case AUDIT_SUBJ_CLR:
Darrel Goeddel6e5a2d12006-06-29 16:57:08 -0500854 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:
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +0200859 err = audit_dupe_lsm_field(&new->fields[i],
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600860 &old->fields[i]);
Amy Griffis5adc8a62006-06-14 18:45:21 -0400861 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;
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400868 break;
869 case AUDIT_EXE:
870 err = audit_dupe_exe(new, old);
871 break;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600872 }
873 if (err) {
Richard Guy Briggs34d99af52015-08-05 16:29:37 -0400874 if (new->exe)
875 audit_remove_mark(new->exe);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600876 audit_free_rule(entry);
877 return ERR_PTR(err);
878 }
879 }
880
Eric Parisae7b8f42009-12-17 20:12:04 -0500881 if (old->watch) {
882 audit_get_watch(old->watch);
883 new->watch = old->watch;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400884 }
885
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600886 return entry;
887}
888
Amy Griffisf368c07d2006-04-07 16:55:56 -0400889/* 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,
Al Viro36c4f1b12008-12-15 01:50:28 -0500892 struct list_head **p)
Amy Griffisf368c07d2006-04-07 16:55:56 -0400893{
894 struct audit_entry *e, *found = NULL;
Al Viro36c4f1b12008-12-15 01:50:28 -0500895 struct list_head *list;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400896 int h;
897
Al Viro36c4f1b12008-12-15 01:50:28 -0500898 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) {
Amy Griffisf368c07d2006-04-07 16:55:56 -0400902 /* 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;
Al Viro36c4f1b12008-12-15 01:50:28 -0500912 } else {
913 *p = list = &audit_filter_list[entry->rule.listnr];
Amy Griffisf368c07d2006-04-07 16:55:56 -0400914 }
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
Al Viro0590b932008-12-14 23:45:27 -0500926static u64 prio_low = ~0ULL/2;
927static u64 prio_high = ~0ULL/2 - 1;
928
Amy Griffisf368c07d2006-04-07 16:55:56 -0400929/* Add rule to given filterlist if not a duplicate. */
Al Viro36c4f1b12008-12-15 01:50:28 -0500930static inline int audit_add_rule(struct audit_entry *entry)
Amy Griffisf368c07d2006-04-07 16:55:56 -0400931{
932 struct audit_entry *e;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400933 struct audit_watch *watch = entry->rule.watch;
Al Viro74c3cbe2007-07-22 08:04:18 -0400934 struct audit_tree *tree = entry->rule.tree;
Al Viro36c4f1b12008-12-15 01:50:28 -0500935 struct list_head *list;
Paul Mooreae9d2fb2015-08-05 11:19:45 -0400936 int err = 0;
Al Viro471a5c72006-07-10 08:29:24 -0400937#ifdef CONFIG_AUDITSYSCALL
938 int dont_count = 0;
939
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400940 /* If any of these, don't count towards total */
941 switch(entry->rule.listnr) {
942 case AUDIT_FILTER_USER:
Richard Guy Briggsd904ac02018-06-05 11:45:07 -0400943 case AUDIT_FILTER_EXCLUDE:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400944 case AUDIT_FILTER_FS:
Al Viro471a5c72006-07-10 08:29:24 -0400945 dont_count = 1;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -0400946 }
Al Viro471a5c72006-07-10 08:29:24 -0400947#endif
Amy Griffisf368c07d2006-04-07 16:55:56 -0400948
Amy Griffisf368c07d2006-04-07 16:55:56 -0400949 mutex_lock(&audit_filter_mutex);
Al Viro36c4f1b12008-12-15 01:50:28 -0500950 e = audit_find_rule(entry, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400951 if (e) {
Eric Paris35fe4d02009-06-11 14:31:36 -0400952 mutex_unlock(&audit_filter_mutex);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400953 err = -EEXIST;
Al Viro74c3cbe2007-07-22 08:04:18 -0400954 /* normally audit_add_tree_rule() will free it on failure */
955 if (tree)
956 audit_put_tree(tree);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400957 return err;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400958 }
959
Amy Griffisf368c07d2006-04-07 16:55:56 -0400960 if (watch) {
961 /* audit_filter_mutex is dropped and re-taken during this call */
Eric Parisae7b8f42009-12-17 20:12:04 -0500962 err = audit_add_watch(&entry->rule, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400963 if (err) {
964 mutex_unlock(&audit_filter_mutex);
Chen Gang2f992ee2013-07-08 15:59:38 -0700965 /*
966 * normally audit_add_tree_rule() will free it
967 * on failure
968 */
969 if (tree)
970 audit_put_tree(tree);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400971 return err;
Amy Griffisf368c07d2006-04-07 16:55:56 -0400972 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000973 }
Al Viro74c3cbe2007-07-22 08:04:18 -0400974 if (tree) {
975 err = audit_add_tree_rule(&entry->rule);
976 if (err) {
977 mutex_unlock(&audit_filter_mutex);
Richard Guy Briggsf8259b22015-08-01 15:41:12 -0400978 return err;
Al Viro74c3cbe2007-07-22 08:04:18 -0400979 }
980 }
David Woodhousefe7752b2005-12-15 18:33:52 +0000981
Al Viro0590b932008-12-14 23:45:27 -0500982 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
David Woodhousefe7752b2005-12-15 18:33:52 +0000990 if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
Al Viroe45aa212008-12-15 01:17:50 -0500991 list_add(&entry->rule.list,
992 &audit_rules_list[entry->rule.listnr]);
David Woodhousefe7752b2005-12-15 18:33:52 +0000993 list_add_rcu(&entry->list, list);
Amy Griffis6a2bcee2006-06-02 13:16:01 -0400994 entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
David Woodhousefe7752b2005-12-15 18:33:52 +0000995 } else {
Al Viroe45aa212008-12-15 01:17:50 -0500996 list_add_tail(&entry->rule.list,
997 &audit_rules_list[entry->rule.listnr]);
David Woodhousefe7752b2005-12-15 18:33:52 +0000998 list_add_tail_rcu(&entry->list, list);
999 }
Al Viro471a5c72006-07-10 08:29:24 -04001000#ifdef CONFIG_AUDITSYSCALL
1001 if (!dont_count)
1002 audit_n_rules++;
Amy Griffise54dc242007-03-29 18:01:04 -04001003
1004 if (!audit_match_signal(entry))
1005 audit_signals++;
Al Viro471a5c72006-07-10 08:29:24 -04001006#endif
Amy Griffisf368c07d2006-04-07 16:55:56 -04001007 mutex_unlock(&audit_filter_mutex);
David Woodhousefe7752b2005-12-15 18:33:52 +00001008
Amy Griffisf368c07d2006-04-07 16:55:56 -04001009 return err;
David Woodhousefe7752b2005-12-15 18:33:52 +00001010}
1011
Amy Griffisf368c07d2006-04-07 16:55:56 -04001012/* Remove an existing rule from filterlist. */
Richard Guy Briggs7f492942015-08-05 16:29:36 -04001013int audit_del_rule(struct audit_entry *entry)
David Woodhousefe7752b2005-12-15 18:33:52 +00001014{
1015 struct audit_entry *e;
Al Viro74c3cbe2007-07-22 08:04:18 -04001016 struct audit_tree *tree = entry->rule.tree;
Al Viro36c4f1b12008-12-15 01:50:28 -05001017 struct list_head *list;
Al Viro36c4f1b12008-12-15 01:50:28 -05001018 int ret = 0;
Al Viro471a5c72006-07-10 08:29:24 -04001019#ifdef CONFIG_AUDITSYSCALL
1020 int dont_count = 0;
1021
Richard Guy Briggs42d5e372017-08-23 07:03:39 -04001022 /* If any of these, don't count towards total */
1023 switch(entry->rule.listnr) {
1024 case AUDIT_FILTER_USER:
Richard Guy Briggsd904ac02018-06-05 11:45:07 -04001025 case AUDIT_FILTER_EXCLUDE:
Richard Guy Briggs42d5e372017-08-23 07:03:39 -04001026 case AUDIT_FILTER_FS:
Al Viro471a5c72006-07-10 08:29:24 -04001027 dont_count = 1;
Richard Guy Briggs42d5e372017-08-23 07:03:39 -04001028 }
Al Viro471a5c72006-07-10 08:29:24 -04001029#endif
David Woodhousefe7752b2005-12-15 18:33:52 +00001030
Amy Griffisf368c07d2006-04-07 16:55:56 -04001031 mutex_lock(&audit_filter_mutex);
Al Viro36c4f1b12008-12-15 01:50:28 -05001032 e = audit_find_rule(entry, &list);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001033 if (!e) {
Amy Griffisf368c07d2006-04-07 16:55:56 -04001034 ret = -ENOENT;
1035 goto out;
1036 }
1037
Eric Pariscfcad622009-06-11 14:31:36 -04001038 if (e->rule.watch)
Eric Parisa05fb6c2009-12-17 20:12:05 -05001039 audit_remove_watch_rule(&e->rule);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001040
Al Viro74c3cbe2007-07-22 08:04:18 -04001041 if (e->rule.tree)
1042 audit_remove_tree_rule(&e->rule);
1043
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001044 if (e->rule.exe)
1045 audit_remove_mark_rule(&e->rule);
1046
Al Viro471a5c72006-07-10 08:29:24 -04001047#ifdef CONFIG_AUDITSYSCALL
1048 if (!dont_count)
1049 audit_n_rules--;
Amy Griffise54dc242007-03-29 18:01:04 -04001050
1051 if (!audit_match_signal(entry))
1052 audit_signals--;
Al Viro471a5c72006-07-10 08:29:24 -04001053#endif
Richard Guy Briggs8c85fc92015-08-05 15:23:09 -04001054
1055 list_del_rcu(&e->list);
1056 list_del(&e->rule.list);
1057 call_rcu(&e->rcu, audit_free_rule_rcu);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001058
Amy Griffisf368c07d2006-04-07 16:55:56 -04001059out:
Richard Guy Briggs8c85fc92015-08-05 15:23:09 -04001060 mutex_unlock(&audit_filter_mutex);
1061
Al Viro74c3cbe2007-07-22 08:04:18 -04001062 if (tree)
1063 audit_put_tree(tree); /* that's the temporary one */
Amy Griffisf368c07d2006-04-07 16:55:56 -04001064
1065 return ret;
David Woodhousefe7752b2005-12-15 18:33:52 +00001066}
1067
Amy Griffis93315ed2006-02-07 12:05:27 -05001068/* List rules using struct audit_rule_data. */
Paul Moore45a06422017-05-02 10:16:05 -04001069static void audit_list_rules(int seq, struct sk_buff_head *q)
Amy Griffis93315ed2006-02-07 12:05:27 -05001070{
Al Viro9044e6b2006-05-22 01:09:24 -04001071 struct sk_buff *skb;
Al Viroe45aa212008-12-15 01:17:50 -05001072 struct audit_krule *r;
Amy Griffis93315ed2006-02-07 12:05:27 -05001073 int i;
1074
Amy Griffisf368c07d2006-04-07 16:55:56 -04001075 /* This is a blocking read, so use audit_filter_mutex instead of rcu
1076 * iterator to sync with list writers. */
Amy Griffis93315ed2006-02-07 12:05:27 -05001077 for (i=0; i<AUDIT_NR_FILTERS; i++) {
Al Viroe45aa212008-12-15 01:17:50 -05001078 list_for_each_entry(r, &audit_rules_list[i], list) {
Amy Griffis93315ed2006-02-07 12:05:27 -05001079 struct audit_rule_data *data;
1080
Al Viroe45aa212008-12-15 01:17:50 -05001081 data = audit_krule_to_data(r);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001082 if (unlikely(!data))
1083 break;
Paul Moore45a06422017-05-02 10:16:05 -04001084 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1,
1085 data,
Richard Guy Briggsf9441632013-08-14 11:32:45 -04001086 sizeof(*data) + data->buflen);
Al Viro9044e6b2006-05-22 01:09:24 -04001087 if (skb)
1088 skb_queue_tail(q, skb);
Amy Griffis93315ed2006-02-07 12:05:27 -05001089 kfree(data);
1090 }
1091 }
Paul Moore45a06422017-05-02 10:16:05 -04001092 skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0);
Al Viro9044e6b2006-05-22 01:09:24 -04001093 if (skb)
1094 skb_queue_tail(q, skb);
Amy Griffis93315ed2006-02-07 12:05:27 -05001095}
1096
Amy Griffis5adc8a62006-06-14 18:45:21 -04001097/* Log rule additions and removals */
Eric Parisdc9eb692013-04-19 13:23:09 -04001098static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
Amy Griffis5adc8a62006-06-14 18:45:21 -04001099{
1100 struct audit_buffer *ab;
1101
Eric Paris1a6b9f22008-01-07 17:09:31 -05001102 if (!audit_enabled)
1103 return;
1104
Richard Guy Briggs626abcd2019-01-18 17:42:48 -05001105 ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
Amy Griffis5adc8a62006-06-14 18:45:21 -04001106 if (!ab)
1107 return;
Richard Guy Briggs5c5b8d82018-05-17 22:01:48 -04001108 audit_log_session_info(ab);
Eric Parisb122c372013-04-19 15:00:33 -04001109 audit_log_task_context(ab);
Steve Grubbc1e8f062016-11-16 16:14:33 -05001110 audit_log_format(ab, " op=%s", action);
Eric Paris9d960982009-06-11 14:31:37 -04001111 audit_log_key(ab, rule->filterkey);
Amy Griffis5adc8a62006-06-14 18:45:21 -04001112 audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
1113 audit_log_end(ab);
1114}
1115
David Woodhousefe7752b2005-12-15 18:33:52 +00001116/**
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001117 * audit_rule_change - apply all rules to the specified message type
David Woodhousefe7752b2005-12-15 18:33:52 +00001118 * @type: audit message type
David Woodhousefe7752b2005-12-15 18:33:52 +00001119 * @seq: netlink audit message sequence (serial) number
1120 * @data: payload data
Amy Griffis93315ed2006-02-07 12:05:27 -05001121 * @datasz: size of payload data
David Woodhousefe7752b2005-12-15 18:33:52 +00001122 */
Paul Moore45a06422017-05-02 10:16:05 -04001123int audit_rule_change(int type, int seq, void *data, size_t datasz)
David Woodhousefe7752b2005-12-15 18:33:52 +00001124{
Amy Griffis93315ed2006-02-07 12:05:27 -05001125 int err = 0;
1126 struct audit_entry *entry;
David Woodhousefe7752b2005-12-15 18:33:52 +00001127
1128 switch (type) {
Amy Griffis93315ed2006-02-07 12:05:27 -05001129 case AUDIT_ADD_RULE:
Wenwen Wang70c4cf12019-04-19 20:49:29 -05001130 entry = audit_data_to_entry(data, datasz);
1131 if (IS_ERR(entry))
1132 return PTR_ERR(entry);
Al Viro36c4f1b12008-12-15 01:50:28 -05001133 err = audit_add_rule(entry);
Burn Altinge7df61f2014-04-04 16:00:38 +11001134 audit_log_rule_change("add_rule", &entry->rule, !err);
David Woodhousefe7752b2005-12-15 18:33:52 +00001135 break;
Amy Griffis93315ed2006-02-07 12:05:27 -05001136 case AUDIT_DEL_RULE:
Wenwen Wang70c4cf12019-04-19 20:49:29 -05001137 entry = audit_data_to_entry(data, datasz);
1138 if (IS_ERR(entry))
1139 return PTR_ERR(entry);
Al Viro36c4f1b12008-12-15 01:50:28 -05001140 err = audit_del_rule(entry);
Burn Altinge7df61f2014-04-04 16:00:38 +11001141 audit_log_rule_change("remove_rule", &entry->rule, !err);
David Woodhousefe7752b2005-12-15 18:33:52 +00001142 break;
1143 default:
Eric Paris739c9502014-10-10 15:05:21 -04001144 WARN_ON(1);
Wenwen Wang70c4cf12019-04-19 20:49:29 -05001145 return -EINVAL;
David Woodhousefe7752b2005-12-15 18:33:52 +00001146 }
1147
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001148 if (err || type == AUDIT_DEL_RULE) {
1149 if (entry->rule.exe)
1150 audit_remove_mark(entry->rule.exe);
Richard Guy Briggse85322d2014-10-02 22:05:19 -04001151 audit_free_rule(entry);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001152 }
Richard Guy Briggse85322d2014-10-02 22:05:19 -04001153
David Woodhousefe7752b2005-12-15 18:33:52 +00001154 return err;
1155}
1156
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001157/**
1158 * audit_list_rules_send - list the audit rules
Eric W. Biedermand211f1772014-03-08 15:31:54 -08001159 * @request_skb: skb of request we are replying to (used to target the reply)
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001160 * @seq: netlink audit message sequence (serial) number
1161 */
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001162int audit_list_rules_send(struct sk_buff *request_skb, int seq)
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001163{
1164 struct task_struct *tsk;
1165 struct audit_netlink_list *dest;
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001166
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
Paul Moore3054d062020-04-21 09:10:56 -04001173 dest = kmalloc(sizeof(*dest), GFP_KERNEL);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001174 if (!dest)
1175 return -ENOMEM;
Paul Moore3054d062020-04-21 09:10:56 -04001176 dest->net = get_net(sock_net(NETLINK_CB(request_skb).sk));
1177 dest->portid = NETLINK_CB(request_skb).portid;
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001178 skb_queue_head_init(&dest->q);
1179
1180 mutex_lock(&audit_filter_mutex);
Paul Moore45a06422017-05-02 10:16:05 -04001181 audit_list_rules(seq, &dest->q);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001182 mutex_unlock(&audit_filter_mutex);
1183
Paul Moore3054d062020-04-21 09:10:56 -04001184 tsk = kthread_run(audit_send_list_thread, dest, "audit_send_list");
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001185 if (IS_ERR(tsk)) {
1186 skb_queue_purge(&dest->q);
Paul Moore3054d062020-04-21 09:10:56 -04001187 put_net(dest->net);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001188 kfree(dest);
Paul Moore3054d062020-04-21 09:10:56 -04001189 return PTR_ERR(tsk);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001190 }
1191
Paul Moore3054d062020-04-21 09:10:56 -04001192 return 0;
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001193}
1194
Al Viro5af75d82008-12-16 05:59:26 -05001195int audit_comparator(u32 left, u32 op, u32 right)
David Woodhousefe7752b2005-12-15 18:33:52 +00001196{
1197 switch (op) {
Al Viro5af75d82008-12-16 05:59:26 -05001198 case Audit_equal:
David Woodhousefe7752b2005-12-15 18:33:52 +00001199 return (left == right);
Al Viro5af75d82008-12-16 05:59:26 -05001200 case Audit_not_equal:
David Woodhousefe7752b2005-12-15 18:33:52 +00001201 return (left != right);
Al Viro5af75d82008-12-16 05:59:26 -05001202 case Audit_lt:
David Woodhousefe7752b2005-12-15 18:33:52 +00001203 return (left < right);
Al Viro5af75d82008-12-16 05:59:26 -05001204 case Audit_le:
David Woodhousefe7752b2005-12-15 18:33:52 +00001205 return (left <= right);
Al Viro5af75d82008-12-16 05:59:26 -05001206 case Audit_gt:
David Woodhousefe7752b2005-12-15 18:33:52 +00001207 return (left > right);
Al Viro5af75d82008-12-16 05:59:26 -05001208 case Audit_ge:
David Woodhousefe7752b2005-12-15 18:33:52 +00001209 return (left >= right);
Al Viro5af75d82008-12-16 05:59:26 -05001210 case Audit_bitmask:
Eric Paris74f23452007-06-04 17:00:14 -04001211 return (left & right);
Al Viro5af75d82008-12-16 05:59:26 -05001212 case Audit_bittest:
Eric Paris74f23452007-06-04 17:00:14 -04001213 return ((left & right) == right);
Al Viro5af75d82008-12-16 05:59:26 -05001214 default:
Al Viro5af75d82008-12-16 05:59:26 -05001215 return 0;
David Woodhousefe7752b2005-12-15 18:33:52 +00001216 }
1217}
1218
Eric W. Biedermanca57ec02012-09-11 02:18:08 -07001219int 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:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -07001237 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:
Eric W. Biedermanca57ec02012-09-11 02:18:08 -07001259 return 0;
1260 }
1261}
1262
Jeff Laytonbfcec702012-10-10 15:25:23 -04001263/**
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
Jeff Laytone3d6b072012-10-10 15:25:25 -04001293/**
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 */
Al Viro795d6732019-04-26 14:11:05 -04001301int audit_compare_dname_path(const struct qstr *dname, const char *path, int parentlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001302{
Jeff Laytone3d6b072012-10-10 15:25:25 -04001303 int dlen, pathlen;
Amy Griffisf368c07d2006-04-07 16:55:56 -04001304 const char *p;
David Woodhousefe7752b2005-12-15 18:33:52 +00001305
Al Viro795d6732019-04-26 14:11:05 -04001306 dlen = dname->len;
Eric Paris29e9a342012-10-10 15:25:24 -04001307 pathlen = strlen(path);
1308 if (pathlen < dlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001309 return 1;
1310
Jeff Laytone3d6b072012-10-10 15:25:25 -04001311 parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
Eric Paris29e9a342012-10-10 15:25:24 -04001312 if (pathlen - parentlen != dlen)
Amy Griffisf368c07d2006-04-07 16:55:56 -04001313 return 1;
Eric Paris29e9a342012-10-10 15:25:24 -04001314
1315 p = path + parentlen;
Amy Griffisf368c07d2006-04-07 16:55:56 -04001316
Al Viro795d6732019-04-26 14:11:05 -04001317 return strncmp(p, dname->name, dlen);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001318}
David Woodhousefe7752b2005-12-15 18:33:52 +00001319
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001320int audit_filter(int msgtype, unsigned int listtype)
David Woodhousefe7752b2005-12-15 18:33:52 +00001321{
David Woodhousefe7752b2005-12-15 18:33:52 +00001322 struct audit_entry *e;
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001323 int ret = 1; /* Audit by default */
David Woodhousefe7752b2005-12-15 18:33:52 +00001324
1325 rcu_read_lock();
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001326 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,
Richard Guy Briggs90462a52019-01-31 11:52:11 -05001364 f->type, f->op, f->lsm_rule);
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001365 }
1366 break;
Ondrej Mosnáček29c13722018-05-30 10:45:24 +02001367 case AUDIT_EXE:
1368 result = audit_exe_compare(current, e->rule.exe);
1369 if (f->op == Audit_not_equal)
1370 result = !result;
1371 break;
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001372 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) {
Richard Guy Briggsd904ac02018-06-05 11:45:07 -04001381 if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_EXCLUDE)
David Woodhousefe7752b2005-12-15 18:33:52 +00001382 ret = 0;
1383 break;
1384 }
1385 }
David Woodhousefe7752b2005-12-15 18:33:52 +00001386unlock_and_return:
1387 rcu_read_unlock();
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001388 return ret;
David Woodhousefe7752b2005-12-15 18:33:52 +00001389}
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001390
Al Viroe45aa212008-12-15 01:17:50 -05001391static int update_lsm_rule(struct audit_krule *r)
Al Viro1a9d07972008-12-14 12:04:02 -05001392{
Al Viroe45aa212008-12-15 01:17:50 -05001393 struct audit_entry *entry = container_of(r, struct audit_entry, rule);
Al Viro1a9d07972008-12-14 12:04:02 -05001394 struct audit_entry *nentry;
Al Viro1a9d07972008-12-14 12:04:02 -05001395 int err = 0;
1396
Al Viroe45aa212008-12-15 01:17:50 -05001397 if (!security_audit_rule_known(r))
Al Viro1a9d07972008-12-14 12:04:02 -05001398 return 0;
1399
Eric Parisae7b8f42009-12-17 20:12:04 -05001400 nentry = audit_dupe_rule(r);
Richard Guy Briggs34d99af52015-08-05 16:29:37 -04001401 if (entry->rule.exe)
1402 audit_remove_mark(entry->rule.exe);
Al Viro1a9d07972008-12-14 12:04:02 -05001403 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");
Eric Parisae7b8f42009-12-17 20:12:04 -05001408 if (r->watch)
Al Viroe45aa212008-12-15 01:17:50 -05001409 list_del(&r->rlist);
Al Viro1a9d07972008-12-14 12:04:02 -05001410 list_del_rcu(&entry->list);
Al Viroe45aa212008-12-15 01:17:50 -05001411 list_del(&r->list);
Al Viro1a9d07972008-12-14 12:04:02 -05001412 } else {
Eric Parisae7b8f42009-12-17 20:12:04 -05001413 if (r->watch || r->tree)
Al Viroe45aa212008-12-15 01:17:50 -05001414 list_replace_init(&r->rlist, &nentry->rule.rlist);
Al Viro1a9d07972008-12-14 12:04:02 -05001415 list_replace_rcu(&entry->list, &nentry->list);
Al Viroe45aa212008-12-15 01:17:50 -05001416 list_replace(&r->list, &nentry->rule.list);
Al Viro1a9d07972008-12-14 12:04:02 -05001417 }
1418 call_rcu(&entry->rcu, audit_free_rule_rcu);
1419
1420 return err;
1421}
1422
Ahmed S. Darwish04305e42008-04-19 09:59:43 +10001423/* This function will re-initialize the lsm_rule field of all applicable rules.
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001424 * It will traverse the filter lists serarching for rules that contain LSM
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001425 * specific filter fields. When such a rule is found, it is copied, the
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001426 * LSM field is re-initialized, and the old rule is replaced with the
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001427 * updated rule. */
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +02001428int audit_update_lsm_rules(void)
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001429{
Al Viroe45aa212008-12-15 01:17:50 -05001430 struct audit_krule *r, *n;
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001431 int i, err = 0;
1432
Amy Griffisf368c07d2006-04-07 16:55:56 -04001433 /* audit_filter_mutex synchronizes the writers */
1434 mutex_lock(&audit_filter_mutex);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001435
1436 for (i = 0; i < AUDIT_NR_FILTERS; i++) {
Al Viroe45aa212008-12-15 01:17:50 -05001437 list_for_each_entry_safe(r, n, &audit_rules_list[i], list) {
1438 int res = update_lsm_rule(r);
Al Viro1a9d07972008-12-14 12:04:02 -05001439 if (!err)
1440 err = res;
1441 }
1442 }
Amy Griffisf368c07d2006-04-07 16:55:56 -04001443 mutex_unlock(&audit_filter_mutex);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001444
1445 return err;
1446}