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85c8721f | 1 | /* auditsc.c -- System-call auditing support |
1da177e4 LT |
2 | * Handles all system-call specific auditing features. |
3 | * | |
4 | * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. | |
73241ccc | 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
b63862f4 | 6 | * Copyright (C) 2005 IBM Corporation |
1da177e4 LT |
7 | * All Rights Reserved. |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> | |
24 | * | |
25 | * Many of the ideas implemented here are from Stephen C. Tweedie, | |
26 | * especially the idea of avoiding a copy by using getname. | |
27 | * | |
28 | * The method for actual interception of syscall entry and exit (not in | |
29 | * this file -- see entry.S) is based on a GPL'd patch written by | |
30 | * okir@suse.de and Copyright 2003 SuSE Linux AG. | |
31 | * | |
b63862f4 DK |
32 | * The support of additional filter rules compares (>, <, >=, <=) was |
33 | * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005. | |
34 | * | |
73241ccc AG |
35 | * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional |
36 | * filesystem information. | |
8c8570fb DK |
37 | * |
38 | * Subject and object context labeling support added by <danjones@us.ibm.com> | |
39 | * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance. | |
1da177e4 LT |
40 | */ |
41 | ||
42 | #include <linux/init.h> | |
1da177e4 | 43 | #include <asm/types.h> |
715b49ef | 44 | #include <asm/atomic.h> |
73241ccc AG |
45 | #include <asm/types.h> |
46 | #include <linux/fs.h> | |
47 | #include <linux/namei.h> | |
1da177e4 LT |
48 | #include <linux/mm.h> |
49 | #include <linux/module.h> | |
01116105 | 50 | #include <linux/mount.h> |
3ec3b2fb | 51 | #include <linux/socket.h> |
1da177e4 LT |
52 | #include <linux/audit.h> |
53 | #include <linux/personality.h> | |
54 | #include <linux/time.h> | |
5bb289b5 | 55 | #include <linux/netlink.h> |
f5561964 | 56 | #include <linux/compiler.h> |
1da177e4 | 57 | #include <asm/unistd.h> |
8c8570fb | 58 | #include <linux/security.h> |
fe7752ba | 59 | #include <linux/list.h> |
a6c043a8 | 60 | #include <linux/tty.h> |
3dc7e315 | 61 | #include <linux/selinux.h> |
1da177e4 | 62 | |
fe7752ba | 63 | #include "audit.h" |
1da177e4 | 64 | |
fe7752ba | 65 | extern struct list_head audit_filter_list[]; |
1da177e4 LT |
66 | |
67 | /* No syscall auditing will take place unless audit_enabled != 0. */ | |
68 | extern int audit_enabled; | |
69 | ||
70 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context | |
71 | * for saving names from getname(). */ | |
72 | #define AUDIT_NAMES 20 | |
73 | ||
74 | /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the | |
75 | * audit_context from being used for nameless inodes from | |
76 | * path_lookup. */ | |
77 | #define AUDIT_NAMES_RESERVED 7 | |
78 | ||
1da177e4 LT |
79 | /* When fs/namei.c:getname() is called, we store the pointer in name and |
80 | * we don't let putname() free it (instead we free all of the saved | |
81 | * pointers at syscall exit time). | |
82 | * | |
83 | * Further, in fs/namei.c:path_lookup() we store the inode and device. */ | |
84 | struct audit_names { | |
85 | const char *name; | |
86 | unsigned long ino; | |
73241ccc | 87 | unsigned long pino; |
1da177e4 LT |
88 | dev_t dev; |
89 | umode_t mode; | |
90 | uid_t uid; | |
91 | gid_t gid; | |
92 | dev_t rdev; | |
1b50eed9 | 93 | u32 osid; |
1da177e4 LT |
94 | }; |
95 | ||
96 | struct audit_aux_data { | |
97 | struct audit_aux_data *next; | |
98 | int type; | |
99 | }; | |
100 | ||
101 | #define AUDIT_AUX_IPCPERM 0 | |
102 | ||
103 | struct audit_aux_data_ipcctl { | |
104 | struct audit_aux_data d; | |
105 | struct ipc_perm p; | |
106 | unsigned long qbytes; | |
107 | uid_t uid; | |
108 | gid_t gid; | |
109 | mode_t mode; | |
8c8570fb | 110 | char *ctx; |
1da177e4 LT |
111 | }; |
112 | ||
3ec3b2fb DW |
113 | struct audit_aux_data_socketcall { |
114 | struct audit_aux_data d; | |
115 | int nargs; | |
116 | unsigned long args[0]; | |
117 | }; | |
118 | ||
119 | struct audit_aux_data_sockaddr { | |
120 | struct audit_aux_data d; | |
121 | int len; | |
122 | char a[0]; | |
123 | }; | |
124 | ||
01116105 SS |
125 | struct audit_aux_data_path { |
126 | struct audit_aux_data d; | |
127 | struct dentry *dentry; | |
128 | struct vfsmount *mnt; | |
129 | }; | |
1da177e4 LT |
130 | |
131 | /* The per-task audit context. */ | |
132 | struct audit_context { | |
133 | int in_syscall; /* 1 if task is in a syscall */ | |
134 | enum audit_state state; | |
135 | unsigned int serial; /* serial number for record */ | |
136 | struct timespec ctime; /* time of syscall entry */ | |
137 | uid_t loginuid; /* login uid (identity) */ | |
138 | int major; /* syscall number */ | |
139 | unsigned long argv[4]; /* syscall arguments */ | |
140 | int return_valid; /* return code is valid */ | |
2fd6f58b | 141 | long return_code;/* syscall return code */ |
1da177e4 LT |
142 | int auditable; /* 1 if record should be written */ |
143 | int name_count; | |
144 | struct audit_names names[AUDIT_NAMES]; | |
8f37d47c DW |
145 | struct dentry * pwd; |
146 | struct vfsmount * pwdmnt; | |
1da177e4 LT |
147 | struct audit_context *previous; /* For nested syscalls */ |
148 | struct audit_aux_data *aux; | |
149 | ||
150 | /* Save things to print about task_struct */ | |
151 | pid_t pid; | |
152 | uid_t uid, euid, suid, fsuid; | |
153 | gid_t gid, egid, sgid, fsgid; | |
154 | unsigned long personality; | |
2fd6f58b | 155 | int arch; |
1da177e4 LT |
156 | |
157 | #if AUDIT_DEBUG | |
158 | int put_count; | |
159 | int ino_count; | |
160 | #endif | |
161 | }; | |
162 | ||
1da177e4 LT |
163 | |
164 | /* Compare a task_struct with an audit_rule. Return 1 on match, 0 | |
165 | * otherwise. */ | |
166 | static int audit_filter_rules(struct task_struct *tsk, | |
93315ed6 | 167 | struct audit_krule *rule, |
1da177e4 LT |
168 | struct audit_context *ctx, |
169 | enum audit_state *state) | |
170 | { | |
171 | int i, j; | |
3dc7e315 DG |
172 | u32 sid; |
173 | ||
174 | selinux_task_ctxid(tsk, &sid); | |
1da177e4 LT |
175 | |
176 | for (i = 0; i < rule->field_count; i++) { | |
93315ed6 | 177 | struct audit_field *f = &rule->fields[i]; |
1da177e4 LT |
178 | int result = 0; |
179 | ||
93315ed6 | 180 | switch (f->type) { |
1da177e4 | 181 | case AUDIT_PID: |
93315ed6 | 182 | result = audit_comparator(tsk->pid, f->op, f->val); |
1da177e4 LT |
183 | break; |
184 | case AUDIT_UID: | |
93315ed6 | 185 | result = audit_comparator(tsk->uid, f->op, f->val); |
1da177e4 LT |
186 | break; |
187 | case AUDIT_EUID: | |
93315ed6 | 188 | result = audit_comparator(tsk->euid, f->op, f->val); |
1da177e4 LT |
189 | break; |
190 | case AUDIT_SUID: | |
93315ed6 | 191 | result = audit_comparator(tsk->suid, f->op, f->val); |
1da177e4 LT |
192 | break; |
193 | case AUDIT_FSUID: | |
93315ed6 | 194 | result = audit_comparator(tsk->fsuid, f->op, f->val); |
1da177e4 LT |
195 | break; |
196 | case AUDIT_GID: | |
93315ed6 | 197 | result = audit_comparator(tsk->gid, f->op, f->val); |
1da177e4 LT |
198 | break; |
199 | case AUDIT_EGID: | |
93315ed6 | 200 | result = audit_comparator(tsk->egid, f->op, f->val); |
1da177e4 LT |
201 | break; |
202 | case AUDIT_SGID: | |
93315ed6 | 203 | result = audit_comparator(tsk->sgid, f->op, f->val); |
1da177e4 LT |
204 | break; |
205 | case AUDIT_FSGID: | |
93315ed6 | 206 | result = audit_comparator(tsk->fsgid, f->op, f->val); |
1da177e4 LT |
207 | break; |
208 | case AUDIT_PERS: | |
93315ed6 | 209 | result = audit_comparator(tsk->personality, f->op, f->val); |
1da177e4 | 210 | break; |
2fd6f58b | 211 | case AUDIT_ARCH: |
b63862f4 | 212 | if (ctx) |
93315ed6 | 213 | result = audit_comparator(ctx->arch, f->op, f->val); |
2fd6f58b | 214 | break; |
1da177e4 LT |
215 | |
216 | case AUDIT_EXIT: | |
217 | if (ctx && ctx->return_valid) | |
93315ed6 | 218 | result = audit_comparator(ctx->return_code, f->op, f->val); |
1da177e4 LT |
219 | break; |
220 | case AUDIT_SUCCESS: | |
b01f2cc1 | 221 | if (ctx && ctx->return_valid) { |
93315ed6 AG |
222 | if (f->val) |
223 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS); | |
b01f2cc1 | 224 | else |
93315ed6 | 225 | result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE); |
b01f2cc1 | 226 | } |
1da177e4 LT |
227 | break; |
228 | case AUDIT_DEVMAJOR: | |
229 | if (ctx) { | |
230 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 | 231 | if (audit_comparator(MAJOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
232 | ++result; |
233 | break; | |
234 | } | |
235 | } | |
236 | } | |
237 | break; | |
238 | case AUDIT_DEVMINOR: | |
239 | if (ctx) { | |
240 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 | 241 | if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) { |
1da177e4 LT |
242 | ++result; |
243 | break; | |
244 | } | |
245 | } | |
246 | } | |
247 | break; | |
248 | case AUDIT_INODE: | |
249 | if (ctx) { | |
250 | for (j = 0; j < ctx->name_count; j++) { | |
93315ed6 AG |
251 | if (audit_comparator(ctx->names[j].ino, f->op, f->val) || |
252 | audit_comparator(ctx->names[j].pino, f->op, f->val)) { | |
1da177e4 LT |
253 | ++result; |
254 | break; | |
255 | } | |
256 | } | |
257 | } | |
258 | break; | |
259 | case AUDIT_LOGINUID: | |
260 | result = 0; | |
261 | if (ctx) | |
93315ed6 | 262 | result = audit_comparator(ctx->loginuid, f->op, f->val); |
1da177e4 | 263 | break; |
3dc7e315 DG |
264 | case AUDIT_SE_USER: |
265 | case AUDIT_SE_ROLE: | |
266 | case AUDIT_SE_TYPE: | |
267 | case AUDIT_SE_SEN: | |
268 | case AUDIT_SE_CLR: | |
269 | /* NOTE: this may return negative values indicating | |
270 | a temporary error. We simply treat this as a | |
271 | match for now to avoid losing information that | |
272 | may be wanted. An error message will also be | |
273 | logged upon error */ | |
274 | if (f->se_rule) | |
275 | result = selinux_audit_rule_match(sid, f->type, | |
276 | f->op, | |
277 | f->se_rule, | |
278 | ctx); | |
279 | break; | |
1da177e4 LT |
280 | case AUDIT_ARG0: |
281 | case AUDIT_ARG1: | |
282 | case AUDIT_ARG2: | |
283 | case AUDIT_ARG3: | |
284 | if (ctx) | |
93315ed6 | 285 | result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val); |
1da177e4 LT |
286 | break; |
287 | } | |
288 | ||
1da177e4 LT |
289 | if (!result) |
290 | return 0; | |
291 | } | |
292 | switch (rule->action) { | |
293 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; | |
294 | case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break; | |
295 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; | |
296 | } | |
297 | return 1; | |
298 | } | |
299 | ||
300 | /* At process creation time, we can determine if system-call auditing is | |
301 | * completely disabled for this task. Since we only have the task | |
302 | * structure at this point, we can only check uid and gid. | |
303 | */ | |
304 | static enum audit_state audit_filter_task(struct task_struct *tsk) | |
305 | { | |
306 | struct audit_entry *e; | |
307 | enum audit_state state; | |
308 | ||
309 | rcu_read_lock(); | |
0f45aa18 | 310 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) { |
1da177e4 LT |
311 | if (audit_filter_rules(tsk, &e->rule, NULL, &state)) { |
312 | rcu_read_unlock(); | |
313 | return state; | |
314 | } | |
315 | } | |
316 | rcu_read_unlock(); | |
317 | return AUDIT_BUILD_CONTEXT; | |
318 | } | |
319 | ||
320 | /* At syscall entry and exit time, this filter is called if the | |
321 | * audit_state is not low enough that auditing cannot take place, but is | |
23f32d18 | 322 | * also not high enough that we already know we have to write an audit |
b0dd25a8 | 323 | * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT). |
1da177e4 LT |
324 | */ |
325 | static enum audit_state audit_filter_syscall(struct task_struct *tsk, | |
326 | struct audit_context *ctx, | |
327 | struct list_head *list) | |
328 | { | |
329 | struct audit_entry *e; | |
c3896495 | 330 | enum audit_state state; |
1da177e4 | 331 | |
351bb722 | 332 | if (audit_pid && tsk->tgid == audit_pid) |
f7056d64 DW |
333 | return AUDIT_DISABLED; |
334 | ||
1da177e4 | 335 | rcu_read_lock(); |
c3896495 | 336 | if (!list_empty(list)) { |
b63862f4 DK |
337 | int word = AUDIT_WORD(ctx->major); |
338 | int bit = AUDIT_BIT(ctx->major); | |
339 | ||
340 | list_for_each_entry_rcu(e, list, list) { | |
341 | if ((e->rule.mask[word] & bit) == bit | |
342 | && audit_filter_rules(tsk, &e->rule, ctx, &state)) { | |
343 | rcu_read_unlock(); | |
344 | return state; | |
345 | } | |
0f45aa18 DW |
346 | } |
347 | } | |
348 | rcu_read_unlock(); | |
1da177e4 | 349 | return AUDIT_BUILD_CONTEXT; |
0f45aa18 DW |
350 | } |
351 | ||
1da177e4 LT |
352 | static inline struct audit_context *audit_get_context(struct task_struct *tsk, |
353 | int return_valid, | |
354 | int return_code) | |
355 | { | |
356 | struct audit_context *context = tsk->audit_context; | |
357 | ||
358 | if (likely(!context)) | |
359 | return NULL; | |
360 | context->return_valid = return_valid; | |
361 | context->return_code = return_code; | |
362 | ||
21af6c4f | 363 | if (context->in_syscall && !context->auditable) { |
1da177e4 | 364 | enum audit_state state; |
0f45aa18 | 365 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]); |
1da177e4 LT |
366 | if (state == AUDIT_RECORD_CONTEXT) |
367 | context->auditable = 1; | |
368 | } | |
369 | ||
370 | context->pid = tsk->pid; | |
371 | context->uid = tsk->uid; | |
372 | context->gid = tsk->gid; | |
373 | context->euid = tsk->euid; | |
374 | context->suid = tsk->suid; | |
375 | context->fsuid = tsk->fsuid; | |
376 | context->egid = tsk->egid; | |
377 | context->sgid = tsk->sgid; | |
378 | context->fsgid = tsk->fsgid; | |
379 | context->personality = tsk->personality; | |
380 | tsk->audit_context = NULL; | |
381 | return context; | |
382 | } | |
383 | ||
384 | static inline void audit_free_names(struct audit_context *context) | |
385 | { | |
386 | int i; | |
387 | ||
388 | #if AUDIT_DEBUG == 2 | |
389 | if (context->auditable | |
390 | ||context->put_count + context->ino_count != context->name_count) { | |
73241ccc | 391 | printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d" |
1da177e4 LT |
392 | " name_count=%d put_count=%d" |
393 | " ino_count=%d [NOT freeing]\n", | |
73241ccc | 394 | __FILE__, __LINE__, |
1da177e4 LT |
395 | context->serial, context->major, context->in_syscall, |
396 | context->name_count, context->put_count, | |
397 | context->ino_count); | |
8c8570fb | 398 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
399 | printk(KERN_ERR "names[%d] = %p = %s\n", i, |
400 | context->names[i].name, | |
73241ccc | 401 | context->names[i].name ?: "(null)"); |
8c8570fb | 402 | } |
1da177e4 LT |
403 | dump_stack(); |
404 | return; | |
405 | } | |
406 | #endif | |
407 | #if AUDIT_DEBUG | |
408 | context->put_count = 0; | |
409 | context->ino_count = 0; | |
410 | #endif | |
411 | ||
8c8570fb | 412 | for (i = 0; i < context->name_count; i++) { |
1da177e4 LT |
413 | if (context->names[i].name) |
414 | __putname(context->names[i].name); | |
8c8570fb | 415 | } |
1da177e4 | 416 | context->name_count = 0; |
8f37d47c DW |
417 | if (context->pwd) |
418 | dput(context->pwd); | |
419 | if (context->pwdmnt) | |
420 | mntput(context->pwdmnt); | |
421 | context->pwd = NULL; | |
422 | context->pwdmnt = NULL; | |
1da177e4 LT |
423 | } |
424 | ||
425 | static inline void audit_free_aux(struct audit_context *context) | |
426 | { | |
427 | struct audit_aux_data *aux; | |
428 | ||
429 | while ((aux = context->aux)) { | |
01116105 SS |
430 | if (aux->type == AUDIT_AVC_PATH) { |
431 | struct audit_aux_data_path *axi = (void *)aux; | |
432 | dput(axi->dentry); | |
433 | mntput(axi->mnt); | |
434 | } | |
8c8570fb DK |
435 | if ( aux->type == AUDIT_IPC ) { |
436 | struct audit_aux_data_ipcctl *axi = (void *)aux; | |
437 | if (axi->ctx) | |
438 | kfree(axi->ctx); | |
439 | } | |
440 | ||
1da177e4 LT |
441 | context->aux = aux->next; |
442 | kfree(aux); | |
443 | } | |
444 | } | |
445 | ||
446 | static inline void audit_zero_context(struct audit_context *context, | |
447 | enum audit_state state) | |
448 | { | |
449 | uid_t loginuid = context->loginuid; | |
450 | ||
451 | memset(context, 0, sizeof(*context)); | |
452 | context->state = state; | |
453 | context->loginuid = loginuid; | |
454 | } | |
455 | ||
456 | static inline struct audit_context *audit_alloc_context(enum audit_state state) | |
457 | { | |
458 | struct audit_context *context; | |
459 | ||
460 | if (!(context = kmalloc(sizeof(*context), GFP_KERNEL))) | |
461 | return NULL; | |
462 | audit_zero_context(context, state); | |
463 | return context; | |
464 | } | |
465 | ||
b0dd25a8 RD |
466 | /** |
467 | * audit_alloc - allocate an audit context block for a task | |
468 | * @tsk: task | |
469 | * | |
470 | * Filter on the task information and allocate a per-task audit context | |
1da177e4 LT |
471 | * if necessary. Doing so turns on system call auditing for the |
472 | * specified task. This is called from copy_process, so no lock is | |
b0dd25a8 RD |
473 | * needed. |
474 | */ | |
1da177e4 LT |
475 | int audit_alloc(struct task_struct *tsk) |
476 | { | |
477 | struct audit_context *context; | |
478 | enum audit_state state; | |
479 | ||
480 | if (likely(!audit_enabled)) | |
481 | return 0; /* Return if not auditing. */ | |
482 | ||
483 | state = audit_filter_task(tsk); | |
484 | if (likely(state == AUDIT_DISABLED)) | |
485 | return 0; | |
486 | ||
487 | if (!(context = audit_alloc_context(state))) { | |
488 | audit_log_lost("out of memory in audit_alloc"); | |
489 | return -ENOMEM; | |
490 | } | |
491 | ||
492 | /* Preserve login uid */ | |
493 | context->loginuid = -1; | |
494 | if (current->audit_context) | |
495 | context->loginuid = current->audit_context->loginuid; | |
496 | ||
497 | tsk->audit_context = context; | |
498 | set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | static inline void audit_free_context(struct audit_context *context) | |
503 | { | |
504 | struct audit_context *previous; | |
505 | int count = 0; | |
506 | ||
507 | do { | |
508 | previous = context->previous; | |
509 | if (previous || (count && count < 10)) { | |
510 | ++count; | |
511 | printk(KERN_ERR "audit(:%d): major=%d name_count=%d:" | |
512 | " freeing multiple contexts (%d)\n", | |
513 | context->serial, context->major, | |
514 | context->name_count, count); | |
515 | } | |
516 | audit_free_names(context); | |
517 | audit_free_aux(context); | |
518 | kfree(context); | |
519 | context = previous; | |
520 | } while (context); | |
521 | if (count >= 10) | |
522 | printk(KERN_ERR "audit: freed %d contexts\n", count); | |
523 | } | |
524 | ||
e495149b | 525 | static void audit_log_task_context(struct audit_buffer *ab) |
8c8570fb DK |
526 | { |
527 | char *ctx = NULL; | |
528 | ssize_t len = 0; | |
529 | ||
530 | len = security_getprocattr(current, "current", NULL, 0); | |
531 | if (len < 0) { | |
532 | if (len != -EINVAL) | |
533 | goto error_path; | |
534 | return; | |
535 | } | |
536 | ||
e495149b | 537 | ctx = kmalloc(len, GFP_KERNEL); |
7306a0b9 | 538 | if (!ctx) |
8c8570fb | 539 | goto error_path; |
8c8570fb DK |
540 | |
541 | len = security_getprocattr(current, "current", ctx, len); | |
542 | if (len < 0 ) | |
543 | goto error_path; | |
544 | ||
545 | audit_log_format(ab, " subj=%s", ctx); | |
7306a0b9 | 546 | return; |
8c8570fb DK |
547 | |
548 | error_path: | |
549 | if (ctx) | |
550 | kfree(ctx); | |
7306a0b9 | 551 | audit_panic("error in audit_log_task_context"); |
8c8570fb DK |
552 | return; |
553 | } | |
554 | ||
e495149b | 555 | static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
219f0817 | 556 | { |
45d9bb0e AV |
557 | char name[sizeof(tsk->comm)]; |
558 | struct mm_struct *mm = tsk->mm; | |
219f0817 SS |
559 | struct vm_area_struct *vma; |
560 | ||
e495149b AV |
561 | /* tsk == current */ |
562 | ||
45d9bb0e | 563 | get_task_comm(name, tsk); |
99e45eea DW |
564 | audit_log_format(ab, " comm="); |
565 | audit_log_untrustedstring(ab, name); | |
219f0817 | 566 | |
e495149b AV |
567 | if (mm) { |
568 | down_read(&mm->mmap_sem); | |
569 | vma = mm->mmap; | |
570 | while (vma) { | |
571 | if ((vma->vm_flags & VM_EXECUTABLE) && | |
572 | vma->vm_file) { | |
573 | audit_log_d_path(ab, "exe=", | |
574 | vma->vm_file->f_dentry, | |
575 | vma->vm_file->f_vfsmnt); | |
576 | break; | |
577 | } | |
578 | vma = vma->vm_next; | |
219f0817 | 579 | } |
e495149b | 580 | up_read(&mm->mmap_sem); |
219f0817 | 581 | } |
e495149b | 582 | audit_log_task_context(ab); |
219f0817 SS |
583 | } |
584 | ||
e495149b | 585 | static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) |
1da177e4 LT |
586 | { |
587 | int i; | |
588 | struct audit_buffer *ab; | |
7551ced3 | 589 | struct audit_aux_data *aux; |
a6c043a8 | 590 | const char *tty; |
1da177e4 | 591 | |
e495149b AV |
592 | /* tsk == current */ |
593 | ||
594 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); | |
1da177e4 LT |
595 | if (!ab) |
596 | return; /* audit_panic has been called */ | |
bccf6ae0 DW |
597 | audit_log_format(ab, "arch=%x syscall=%d", |
598 | context->arch, context->major); | |
1da177e4 LT |
599 | if (context->personality != PER_LINUX) |
600 | audit_log_format(ab, " per=%lx", context->personality); | |
601 | if (context->return_valid) | |
2fd6f58b DW |
602 | audit_log_format(ab, " success=%s exit=%ld", |
603 | (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", | |
604 | context->return_code); | |
45d9bb0e AV |
605 | if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) |
606 | tty = tsk->signal->tty->name; | |
a6c043a8 SG |
607 | else |
608 | tty = "(none)"; | |
1da177e4 LT |
609 | audit_log_format(ab, |
610 | " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" | |
326e9c8b SG |
611 | " pid=%d auid=%u uid=%u gid=%u" |
612 | " euid=%u suid=%u fsuid=%u" | |
a6c043a8 | 613 | " egid=%u sgid=%u fsgid=%u tty=%s", |
1da177e4 LT |
614 | context->argv[0], |
615 | context->argv[1], | |
616 | context->argv[2], | |
617 | context->argv[3], | |
618 | context->name_count, | |
619 | context->pid, | |
620 | context->loginuid, | |
621 | context->uid, | |
622 | context->gid, | |
623 | context->euid, context->suid, context->fsuid, | |
a6c043a8 | 624 | context->egid, context->sgid, context->fsgid, tty); |
e495149b | 625 | audit_log_task_info(ab, tsk); |
1da177e4 | 626 | audit_log_end(ab); |
1da177e4 | 627 | |
7551ced3 | 628 | for (aux = context->aux; aux; aux = aux->next) { |
c0404993 | 629 | |
e495149b | 630 | ab = audit_log_start(context, GFP_KERNEL, aux->type); |
1da177e4 LT |
631 | if (!ab) |
632 | continue; /* audit_panic has been called */ | |
633 | ||
1da177e4 | 634 | switch (aux->type) { |
c0404993 | 635 | case AUDIT_IPC: { |
1da177e4 LT |
636 | struct audit_aux_data_ipcctl *axi = (void *)aux; |
637 | audit_log_format(ab, | |
8c8570fb DK |
638 | " qbytes=%lx iuid=%u igid=%u mode=%x obj=%s", |
639 | axi->qbytes, axi->uid, axi->gid, axi->mode, axi->ctx); | |
3ec3b2fb DW |
640 | break; } |
641 | ||
642 | case AUDIT_SOCKETCALL: { | |
643 | int i; | |
644 | struct audit_aux_data_socketcall *axs = (void *)aux; | |
645 | audit_log_format(ab, "nargs=%d", axs->nargs); | |
646 | for (i=0; i<axs->nargs; i++) | |
647 | audit_log_format(ab, " a%d=%lx", i, axs->args[i]); | |
648 | break; } | |
649 | ||
650 | case AUDIT_SOCKADDR: { | |
651 | struct audit_aux_data_sockaddr *axs = (void *)aux; | |
652 | ||
653 | audit_log_format(ab, "saddr="); | |
654 | audit_log_hex(ab, axs->a, axs->len); | |
655 | break; } | |
01116105 SS |
656 | |
657 | case AUDIT_AVC_PATH: { | |
658 | struct audit_aux_data_path *axi = (void *)aux; | |
659 | audit_log_d_path(ab, "path=", axi->dentry, axi->mnt); | |
01116105 SS |
660 | break; } |
661 | ||
1da177e4 LT |
662 | } |
663 | audit_log_end(ab); | |
1da177e4 LT |
664 | } |
665 | ||
8f37d47c | 666 | if (context->pwd && context->pwdmnt) { |
e495149b | 667 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD); |
8f37d47c DW |
668 | if (ab) { |
669 | audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt); | |
670 | audit_log_end(ab); | |
671 | } | |
672 | } | |
1da177e4 | 673 | for (i = 0; i < context->name_count; i++) { |
1b50eed9 | 674 | int call_panic = 0; |
73241ccc AG |
675 | unsigned long ino = context->names[i].ino; |
676 | unsigned long pino = context->names[i].pino; | |
677 | ||
e495149b | 678 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
1da177e4 LT |
679 | if (!ab) |
680 | continue; /* audit_panic has been called */ | |
8f37d47c | 681 | |
1da177e4 | 682 | audit_log_format(ab, "item=%d", i); |
73241ccc AG |
683 | |
684 | audit_log_format(ab, " name="); | |
685 | if (context->names[i].name) | |
83c7d091 | 686 | audit_log_untrustedstring(ab, context->names[i].name); |
73241ccc AG |
687 | else |
688 | audit_log_format(ab, "(null)"); | |
689 | ||
690 | if (pino != (unsigned long)-1) | |
691 | audit_log_format(ab, " parent=%lu", pino); | |
692 | if (ino != (unsigned long)-1) | |
693 | audit_log_format(ab, " inode=%lu", ino); | |
694 | if ((pino != (unsigned long)-1) || (ino != (unsigned long)-1)) | |
695 | audit_log_format(ab, " dev=%02x:%02x mode=%#o" | |
696 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
697 | MAJOR(context->names[i].dev), | |
698 | MINOR(context->names[i].dev), | |
699 | context->names[i].mode, | |
700 | context->names[i].uid, | |
701 | context->names[i].gid, | |
702 | MAJOR(context->names[i].rdev), | |
1da177e4 | 703 | MINOR(context->names[i].rdev)); |
1b50eed9 SG |
704 | if (context->names[i].osid != 0) { |
705 | char *ctx = NULL; | |
706 | u32 len; | |
707 | if (selinux_ctxid_to_string( | |
708 | context->names[i].osid, &ctx, &len)) { | |
709 | audit_log_format(ab, " obj=%u", | |
710 | context->names[i].osid); | |
711 | call_panic = 1; | |
712 | } else | |
713 | audit_log_format(ab, " obj=%s", ctx); | |
714 | kfree(ctx); | |
8c8570fb DK |
715 | } |
716 | ||
1da177e4 | 717 | audit_log_end(ab); |
1b50eed9 SG |
718 | if (call_panic) |
719 | audit_panic("error converting sid to string"); | |
1da177e4 LT |
720 | } |
721 | } | |
722 | ||
b0dd25a8 RD |
723 | /** |
724 | * audit_free - free a per-task audit context | |
725 | * @tsk: task whose audit context block to free | |
726 | * | |
fa84cb93 | 727 | * Called from copy_process and do_exit |
b0dd25a8 | 728 | */ |
1da177e4 LT |
729 | void audit_free(struct task_struct *tsk) |
730 | { | |
731 | struct audit_context *context; | |
732 | ||
1da177e4 | 733 | context = audit_get_context(tsk, 0, 0); |
1da177e4 LT |
734 | if (likely(!context)) |
735 | return; | |
736 | ||
737 | /* Check for system calls that do not go through the exit | |
f5561964 DW |
738 | * function (e.g., exit_group), then free context block. |
739 | * We use GFP_ATOMIC here because we might be doing this | |
740 | * in the context of the idle thread */ | |
e495149b | 741 | /* that can happen only if we are called from do_exit() */ |
f7056d64 | 742 | if (context->in_syscall && context->auditable) |
e495149b | 743 | audit_log_exit(context, tsk); |
1da177e4 LT |
744 | |
745 | audit_free_context(context); | |
746 | } | |
747 | ||
b0dd25a8 RD |
748 | /** |
749 | * audit_syscall_entry - fill in an audit record at syscall entry | |
750 | * @tsk: task being audited | |
751 | * @arch: architecture type | |
752 | * @major: major syscall type (function) | |
753 | * @a1: additional syscall register 1 | |
754 | * @a2: additional syscall register 2 | |
755 | * @a3: additional syscall register 3 | |
756 | * @a4: additional syscall register 4 | |
757 | * | |
758 | * Fill in audit context at syscall entry. This only happens if the | |
1da177e4 LT |
759 | * audit context was created when the task was created and the state or |
760 | * filters demand the audit context be built. If the state from the | |
761 | * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, | |
762 | * then the record will be written at syscall exit time (otherwise, it | |
763 | * will only be written if another part of the kernel requests that it | |
b0dd25a8 RD |
764 | * be written). |
765 | */ | |
5411be59 | 766 | void audit_syscall_entry(int arch, int major, |
1da177e4 LT |
767 | unsigned long a1, unsigned long a2, |
768 | unsigned long a3, unsigned long a4) | |
769 | { | |
5411be59 | 770 | struct task_struct *tsk = current; |
1da177e4 LT |
771 | struct audit_context *context = tsk->audit_context; |
772 | enum audit_state state; | |
773 | ||
774 | BUG_ON(!context); | |
775 | ||
b0dd25a8 RD |
776 | /* |
777 | * This happens only on certain architectures that make system | |
1da177e4 LT |
778 | * calls in kernel_thread via the entry.S interface, instead of |
779 | * with direct calls. (If you are porting to a new | |
780 | * architecture, hitting this condition can indicate that you | |
781 | * got the _exit/_leave calls backward in entry.S.) | |
782 | * | |
783 | * i386 no | |
784 | * x86_64 no | |
2ef9481e | 785 | * ppc64 yes (see arch/powerpc/platforms/iseries/misc.S) |
1da177e4 LT |
786 | * |
787 | * This also happens with vm86 emulation in a non-nested manner | |
788 | * (entries without exits), so this case must be caught. | |
789 | */ | |
790 | if (context->in_syscall) { | |
791 | struct audit_context *newctx; | |
792 | ||
1da177e4 LT |
793 | #if AUDIT_DEBUG |
794 | printk(KERN_ERR | |
795 | "audit(:%d) pid=%d in syscall=%d;" | |
796 | " entering syscall=%d\n", | |
797 | context->serial, tsk->pid, context->major, major); | |
798 | #endif | |
799 | newctx = audit_alloc_context(context->state); | |
800 | if (newctx) { | |
801 | newctx->previous = context; | |
802 | context = newctx; | |
803 | tsk->audit_context = newctx; | |
804 | } else { | |
805 | /* If we can't alloc a new context, the best we | |
806 | * can do is to leak memory (any pending putname | |
807 | * will be lost). The only other alternative is | |
808 | * to abandon auditing. */ | |
809 | audit_zero_context(context, context->state); | |
810 | } | |
811 | } | |
812 | BUG_ON(context->in_syscall || context->name_count); | |
813 | ||
814 | if (!audit_enabled) | |
815 | return; | |
816 | ||
2fd6f58b | 817 | context->arch = arch; |
1da177e4 LT |
818 | context->major = major; |
819 | context->argv[0] = a1; | |
820 | context->argv[1] = a2; | |
821 | context->argv[2] = a3; | |
822 | context->argv[3] = a4; | |
823 | ||
824 | state = context->state; | |
825 | if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT) | |
0f45aa18 | 826 | state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]); |
1da177e4 LT |
827 | if (likely(state == AUDIT_DISABLED)) |
828 | return; | |
829 | ||
ce625a80 | 830 | context->serial = 0; |
1da177e4 LT |
831 | context->ctime = CURRENT_TIME; |
832 | context->in_syscall = 1; | |
833 | context->auditable = !!(state == AUDIT_RECORD_CONTEXT); | |
834 | } | |
835 | ||
b0dd25a8 RD |
836 | /** |
837 | * audit_syscall_exit - deallocate audit context after a system call | |
838 | * @tsk: task being audited | |
839 | * @valid: success/failure flag | |
840 | * @return_code: syscall return value | |
841 | * | |
842 | * Tear down after system call. If the audit context has been marked as | |
1da177e4 LT |
843 | * auditable (either because of the AUDIT_RECORD_CONTEXT state from |
844 | * filtering, or because some other part of the kernel write an audit | |
845 | * message), then write out the syscall information. In call cases, | |
b0dd25a8 RD |
846 | * free the names stored from getname(). |
847 | */ | |
5411be59 | 848 | void audit_syscall_exit(int valid, long return_code) |
1da177e4 | 849 | { |
5411be59 | 850 | struct task_struct *tsk = current; |
1da177e4 LT |
851 | struct audit_context *context; |
852 | ||
2fd6f58b | 853 | context = audit_get_context(tsk, valid, return_code); |
1da177e4 | 854 | |
1da177e4 | 855 | if (likely(!context)) |
97e94c45 | 856 | return; |
1da177e4 | 857 | |
f7056d64 | 858 | if (context->in_syscall && context->auditable) |
e495149b | 859 | audit_log_exit(context, tsk); |
1da177e4 LT |
860 | |
861 | context->in_syscall = 0; | |
862 | context->auditable = 0; | |
2fd6f58b | 863 | |
1da177e4 LT |
864 | if (context->previous) { |
865 | struct audit_context *new_context = context->previous; | |
866 | context->previous = NULL; | |
867 | audit_free_context(context); | |
868 | tsk->audit_context = new_context; | |
869 | } else { | |
870 | audit_free_names(context); | |
871 | audit_free_aux(context); | |
1da177e4 LT |
872 | tsk->audit_context = context; |
873 | } | |
1da177e4 LT |
874 | } |
875 | ||
b0dd25a8 RD |
876 | /** |
877 | * audit_getname - add a name to the list | |
878 | * @name: name to add | |
879 | * | |
880 | * Add a name to the list of audit names for this context. | |
881 | * Called from fs/namei.c:getname(). | |
882 | */ | |
1da177e4 LT |
883 | void audit_getname(const char *name) |
884 | { | |
885 | struct audit_context *context = current->audit_context; | |
886 | ||
887 | if (!context || IS_ERR(name) || !name) | |
888 | return; | |
889 | ||
890 | if (!context->in_syscall) { | |
891 | #if AUDIT_DEBUG == 2 | |
892 | printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n", | |
893 | __FILE__, __LINE__, context->serial, name); | |
894 | dump_stack(); | |
895 | #endif | |
896 | return; | |
897 | } | |
898 | BUG_ON(context->name_count >= AUDIT_NAMES); | |
899 | context->names[context->name_count].name = name; | |
900 | context->names[context->name_count].ino = (unsigned long)-1; | |
901 | ++context->name_count; | |
8f37d47c DW |
902 | if (!context->pwd) { |
903 | read_lock(¤t->fs->lock); | |
904 | context->pwd = dget(current->fs->pwd); | |
905 | context->pwdmnt = mntget(current->fs->pwdmnt); | |
906 | read_unlock(¤t->fs->lock); | |
907 | } | |
908 | ||
1da177e4 LT |
909 | } |
910 | ||
b0dd25a8 RD |
911 | /* audit_putname - intercept a putname request |
912 | * @name: name to intercept and delay for putname | |
913 | * | |
914 | * If we have stored the name from getname in the audit context, | |
915 | * then we delay the putname until syscall exit. | |
916 | * Called from include/linux/fs.h:putname(). | |
917 | */ | |
1da177e4 LT |
918 | void audit_putname(const char *name) |
919 | { | |
920 | struct audit_context *context = current->audit_context; | |
921 | ||
922 | BUG_ON(!context); | |
923 | if (!context->in_syscall) { | |
924 | #if AUDIT_DEBUG == 2 | |
925 | printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n", | |
926 | __FILE__, __LINE__, context->serial, name); | |
927 | if (context->name_count) { | |
928 | int i; | |
929 | for (i = 0; i < context->name_count; i++) | |
930 | printk(KERN_ERR "name[%d] = %p = %s\n", i, | |
931 | context->names[i].name, | |
73241ccc | 932 | context->names[i].name ?: "(null)"); |
1da177e4 LT |
933 | } |
934 | #endif | |
935 | __putname(name); | |
936 | } | |
937 | #if AUDIT_DEBUG | |
938 | else { | |
939 | ++context->put_count; | |
940 | if (context->put_count > context->name_count) { | |
941 | printk(KERN_ERR "%s:%d(:%d): major=%d" | |
942 | " in_syscall=%d putname(%p) name_count=%d" | |
943 | " put_count=%d\n", | |
944 | __FILE__, __LINE__, | |
945 | context->serial, context->major, | |
946 | context->in_syscall, name, context->name_count, | |
947 | context->put_count); | |
948 | dump_stack(); | |
949 | } | |
950 | } | |
951 | #endif | |
952 | } | |
953 | ||
8c8570fb DK |
954 | void audit_inode_context(int idx, const struct inode *inode) |
955 | { | |
956 | struct audit_context *context = current->audit_context; | |
8c8570fb | 957 | |
1b50eed9 | 958 | selinux_get_inode_sid(inode, &context->names[idx].osid); |
8c8570fb DK |
959 | } |
960 | ||
961 | ||
b0dd25a8 RD |
962 | /** |
963 | * audit_inode - store the inode and device from a lookup | |
964 | * @name: name being audited | |
965 | * @inode: inode being audited | |
966 | * @flags: lookup flags (as used in path_lookup()) | |
967 | * | |
968 | * Called from fs/namei.c:path_lookup(). | |
969 | */ | |
73241ccc | 970 | void __audit_inode(const char *name, const struct inode *inode, unsigned flags) |
1da177e4 LT |
971 | { |
972 | int idx; | |
973 | struct audit_context *context = current->audit_context; | |
974 | ||
975 | if (!context->in_syscall) | |
976 | return; | |
977 | if (context->name_count | |
978 | && context->names[context->name_count-1].name | |
979 | && context->names[context->name_count-1].name == name) | |
980 | idx = context->name_count - 1; | |
981 | else if (context->name_count > 1 | |
982 | && context->names[context->name_count-2].name | |
983 | && context->names[context->name_count-2].name == name) | |
984 | idx = context->name_count - 2; | |
985 | else { | |
986 | /* FIXME: how much do we care about inodes that have no | |
987 | * associated name? */ | |
988 | if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED) | |
989 | return; | |
990 | idx = context->name_count++; | |
991 | context->names[idx].name = NULL; | |
992 | #if AUDIT_DEBUG | |
993 | ++context->ino_count; | |
994 | #endif | |
995 | } | |
ae7b961b DW |
996 | context->names[idx].dev = inode->i_sb->s_dev; |
997 | context->names[idx].mode = inode->i_mode; | |
998 | context->names[idx].uid = inode->i_uid; | |
999 | context->names[idx].gid = inode->i_gid; | |
1000 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1001 | audit_inode_context(idx, inode); |
73241ccc AG |
1002 | if ((flags & LOOKUP_PARENT) && (strcmp(name, "/") != 0) && |
1003 | (strcmp(name, ".") != 0)) { | |
1004 | context->names[idx].ino = (unsigned long)-1; | |
1005 | context->names[idx].pino = inode->i_ino; | |
1006 | } else { | |
1007 | context->names[idx].ino = inode->i_ino; | |
1008 | context->names[idx].pino = (unsigned long)-1; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * audit_inode_child - collect inode info for created/removed objects | |
1014 | * @dname: inode's dentry name | |
1015 | * @inode: inode being audited | |
1016 | * @pino: inode number of dentry parent | |
1017 | * | |
1018 | * For syscalls that create or remove filesystem objects, audit_inode | |
1019 | * can only collect information for the filesystem object's parent. | |
1020 | * This call updates the audit context with the child's information. | |
1021 | * Syscalls that create a new filesystem object must be hooked after | |
1022 | * the object is created. Syscalls that remove a filesystem object | |
1023 | * must be hooked prior, in order to capture the target inode during | |
1024 | * unsuccessful attempts. | |
1025 | */ | |
1026 | void __audit_inode_child(const char *dname, const struct inode *inode, | |
1027 | unsigned long pino) | |
1028 | { | |
1029 | int idx; | |
1030 | struct audit_context *context = current->audit_context; | |
1031 | ||
1032 | if (!context->in_syscall) | |
1033 | return; | |
1034 | ||
1035 | /* determine matching parent */ | |
1036 | if (dname) | |
1037 | for (idx = 0; idx < context->name_count; idx++) | |
1038 | if (context->names[idx].pino == pino) { | |
1039 | const char *n; | |
1040 | const char *name = context->names[idx].name; | |
1041 | int dlen = strlen(dname); | |
1042 | int nlen = name ? strlen(name) : 0; | |
1043 | ||
1044 | if (nlen < dlen) | |
1045 | continue; | |
1046 | ||
1047 | /* disregard trailing slashes */ | |
1048 | n = name + nlen - 1; | |
1049 | while ((*n == '/') && (n > name)) | |
1050 | n--; | |
1051 | ||
1052 | /* find last path component */ | |
1053 | n = n - dlen + 1; | |
1054 | if (n < name) | |
1055 | continue; | |
1056 | else if (n > name) { | |
1057 | if (*--n != '/') | |
1058 | continue; | |
1059 | else | |
1060 | n++; | |
1061 | } | |
1062 | ||
1063 | if (strncmp(n, dname, dlen) == 0) | |
1064 | goto update_context; | |
1065 | } | |
1066 | ||
1067 | /* catch-all in case match not found */ | |
1068 | idx = context->name_count++; | |
1069 | context->names[idx].name = NULL; | |
1070 | context->names[idx].pino = pino; | |
1071 | #if AUDIT_DEBUG | |
1072 | context->ino_count++; | |
1073 | #endif | |
1074 | ||
1075 | update_context: | |
1076 | if (inode) { | |
1077 | context->names[idx].ino = inode->i_ino; | |
1078 | context->names[idx].dev = inode->i_sb->s_dev; | |
1079 | context->names[idx].mode = inode->i_mode; | |
1080 | context->names[idx].uid = inode->i_uid; | |
1081 | context->names[idx].gid = inode->i_gid; | |
1082 | context->names[idx].rdev = inode->i_rdev; | |
8c8570fb | 1083 | audit_inode_context(idx, inode); |
73241ccc | 1084 | } |
1da177e4 LT |
1085 | } |
1086 | ||
b0dd25a8 RD |
1087 | /** |
1088 | * auditsc_get_stamp - get local copies of audit_context values | |
1089 | * @ctx: audit_context for the task | |
1090 | * @t: timespec to store time recorded in the audit_context | |
1091 | * @serial: serial value that is recorded in the audit_context | |
1092 | * | |
1093 | * Also sets the context as auditable. | |
1094 | */ | |
bfb4496e DW |
1095 | void auditsc_get_stamp(struct audit_context *ctx, |
1096 | struct timespec *t, unsigned int *serial) | |
1da177e4 | 1097 | { |
ce625a80 DW |
1098 | if (!ctx->serial) |
1099 | ctx->serial = audit_serial(); | |
bfb4496e DW |
1100 | t->tv_sec = ctx->ctime.tv_sec; |
1101 | t->tv_nsec = ctx->ctime.tv_nsec; | |
1102 | *serial = ctx->serial; | |
1103 | ctx->auditable = 1; | |
1da177e4 LT |
1104 | } |
1105 | ||
b0dd25a8 RD |
1106 | /** |
1107 | * audit_set_loginuid - set a task's audit_context loginuid | |
1108 | * @task: task whose audit context is being modified | |
1109 | * @loginuid: loginuid value | |
1110 | * | |
1111 | * Returns 0. | |
1112 | * | |
1113 | * Called (set) from fs/proc/base.c::proc_loginuid_write(). | |
1114 | */ | |
456be6cd | 1115 | int audit_set_loginuid(struct task_struct *task, uid_t loginuid) |
1da177e4 | 1116 | { |
456be6cd | 1117 | if (task->audit_context) { |
c0404993 SG |
1118 | struct audit_buffer *ab; |
1119 | ||
9ad9ad38 | 1120 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN); |
c0404993 SG |
1121 | if (ab) { |
1122 | audit_log_format(ab, "login pid=%d uid=%u " | |
326e9c8b | 1123 | "old auid=%u new auid=%u", |
c0404993 SG |
1124 | task->pid, task->uid, |
1125 | task->audit_context->loginuid, loginuid); | |
1126 | audit_log_end(ab); | |
1127 | } | |
456be6cd | 1128 | task->audit_context->loginuid = loginuid; |
1da177e4 LT |
1129 | } |
1130 | return 0; | |
1131 | } | |
1132 | ||
b0dd25a8 RD |
1133 | /** |
1134 | * audit_get_loginuid - get the loginuid for an audit_context | |
1135 | * @ctx: the audit_context | |
1136 | * | |
1137 | * Returns the context's loginuid or -1 if @ctx is NULL. | |
1138 | */ | |
1da177e4 LT |
1139 | uid_t audit_get_loginuid(struct audit_context *ctx) |
1140 | { | |
1141 | return ctx ? ctx->loginuid : -1; | |
1142 | } | |
1143 | ||
8c8570fb DK |
1144 | static char *audit_ipc_context(struct kern_ipc_perm *ipcp) |
1145 | { | |
1146 | struct audit_context *context = current->audit_context; | |
1147 | char *ctx = NULL; | |
1148 | int len = 0; | |
1149 | ||
1150 | if (likely(!context)) | |
1151 | return NULL; | |
1152 | ||
1153 | len = security_ipc_getsecurity(ipcp, NULL, 0); | |
1154 | if (len == -EOPNOTSUPP) | |
1155 | goto ret; | |
1156 | if (len < 0) | |
1157 | goto error_path; | |
1158 | ||
1159 | ctx = kmalloc(len, GFP_ATOMIC); | |
1160 | if (!ctx) | |
1161 | goto error_path; | |
1162 | ||
1163 | len = security_ipc_getsecurity(ipcp, ctx, len); | |
1164 | if (len < 0) | |
1165 | goto error_path; | |
1166 | ||
1167 | return ctx; | |
1168 | ||
1169 | error_path: | |
1170 | kfree(ctx); | |
1171 | audit_panic("error in audit_ipc_context"); | |
1172 | ret: | |
1173 | return NULL; | |
1174 | } | |
1175 | ||
b0dd25a8 RD |
1176 | /** |
1177 | * audit_ipc_perms - record audit data for ipc | |
1178 | * @qbytes: msgq bytes | |
1179 | * @uid: msgq user id | |
1180 | * @gid: msgq group id | |
1181 | * @mode: msgq mode (permissions) | |
1182 | * | |
1183 | * Returns 0 for success or NULL context or < 0 on error. | |
1184 | */ | |
8c8570fb | 1185 | int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp) |
1da177e4 LT |
1186 | { |
1187 | struct audit_aux_data_ipcctl *ax; | |
1188 | struct audit_context *context = current->audit_context; | |
1189 | ||
1190 | if (likely(!context)) | |
1191 | return 0; | |
1192 | ||
8c8570fb | 1193 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); |
1da177e4 LT |
1194 | if (!ax) |
1195 | return -ENOMEM; | |
1196 | ||
1197 | ax->qbytes = qbytes; | |
1198 | ax->uid = uid; | |
1199 | ax->gid = gid; | |
1200 | ax->mode = mode; | |
8c8570fb | 1201 | ax->ctx = audit_ipc_context(ipcp); |
1da177e4 | 1202 | |
c0404993 | 1203 | ax->d.type = AUDIT_IPC; |
1da177e4 LT |
1204 | ax->d.next = context->aux; |
1205 | context->aux = (void *)ax; | |
1206 | return 0; | |
1207 | } | |
c2f0c7c3 | 1208 | |
b0dd25a8 RD |
1209 | /** |
1210 | * audit_socketcall - record audit data for sys_socketcall | |
1211 | * @nargs: number of args | |
1212 | * @args: args array | |
1213 | * | |
1214 | * Returns 0 for success or NULL context or < 0 on error. | |
1215 | */ | |
3ec3b2fb DW |
1216 | int audit_socketcall(int nargs, unsigned long *args) |
1217 | { | |
1218 | struct audit_aux_data_socketcall *ax; | |
1219 | struct audit_context *context = current->audit_context; | |
1220 | ||
1221 | if (likely(!context)) | |
1222 | return 0; | |
1223 | ||
1224 | ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL); | |
1225 | if (!ax) | |
1226 | return -ENOMEM; | |
1227 | ||
1228 | ax->nargs = nargs; | |
1229 | memcpy(ax->args, args, nargs * sizeof(unsigned long)); | |
1230 | ||
1231 | ax->d.type = AUDIT_SOCKETCALL; | |
1232 | ax->d.next = context->aux; | |
1233 | context->aux = (void *)ax; | |
1234 | return 0; | |
1235 | } | |
1236 | ||
b0dd25a8 RD |
1237 | /** |
1238 | * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto | |
1239 | * @len: data length in user space | |
1240 | * @a: data address in kernel space | |
1241 | * | |
1242 | * Returns 0 for success or NULL context or < 0 on error. | |
1243 | */ | |
3ec3b2fb DW |
1244 | int audit_sockaddr(int len, void *a) |
1245 | { | |
1246 | struct audit_aux_data_sockaddr *ax; | |
1247 | struct audit_context *context = current->audit_context; | |
1248 | ||
1249 | if (likely(!context)) | |
1250 | return 0; | |
1251 | ||
1252 | ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL); | |
1253 | if (!ax) | |
1254 | return -ENOMEM; | |
1255 | ||
1256 | ax->len = len; | |
1257 | memcpy(ax->a, a, len); | |
1258 | ||
1259 | ax->d.type = AUDIT_SOCKADDR; | |
1260 | ax->d.next = context->aux; | |
1261 | context->aux = (void *)ax; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
b0dd25a8 RD |
1265 | /** |
1266 | * audit_avc_path - record the granting or denial of permissions | |
1267 | * @dentry: dentry to record | |
1268 | * @mnt: mnt to record | |
1269 | * | |
1270 | * Returns 0 for success or NULL context or < 0 on error. | |
1271 | * | |
1272 | * Called from security/selinux/avc.c::avc_audit() | |
1273 | */ | |
01116105 SS |
1274 | int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt) |
1275 | { | |
1276 | struct audit_aux_data_path *ax; | |
1277 | struct audit_context *context = current->audit_context; | |
1278 | ||
1279 | if (likely(!context)) | |
1280 | return 0; | |
1281 | ||
1282 | ax = kmalloc(sizeof(*ax), GFP_ATOMIC); | |
1283 | if (!ax) | |
1284 | return -ENOMEM; | |
1285 | ||
1286 | ax->dentry = dget(dentry); | |
1287 | ax->mnt = mntget(mnt); | |
1288 | ||
1289 | ax->d.type = AUDIT_AVC_PATH; | |
1290 | ax->d.next = context->aux; | |
1291 | context->aux = (void *)ax; | |
1292 | return 0; | |
1293 | } | |
1294 | ||
b0dd25a8 RD |
1295 | /** |
1296 | * audit_signal_info - record signal info for shutting down audit subsystem | |
1297 | * @sig: signal value | |
1298 | * @t: task being signaled | |
1299 | * | |
1300 | * If the audit subsystem is being terminated, record the task (pid) | |
1301 | * and uid that is doing that. | |
1302 | */ | |
c2f0c7c3 SG |
1303 | void audit_signal_info(int sig, struct task_struct *t) |
1304 | { | |
1305 | extern pid_t audit_sig_pid; | |
1306 | extern uid_t audit_sig_uid; | |
c2f0c7c3 | 1307 | |
582edda5 | 1308 | if (unlikely(audit_pid && t->tgid == audit_pid)) { |
c2f0c7c3 SG |
1309 | if (sig == SIGTERM || sig == SIGHUP) { |
1310 | struct audit_context *ctx = current->audit_context; | |
1311 | audit_sig_pid = current->pid; | |
1312 | if (ctx) | |
1313 | audit_sig_uid = ctx->loginuid; | |
1314 | else | |
1315 | audit_sig_uid = current->uid; | |
1316 | } | |
1317 | } | |
1318 | } |