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Mimi Zohar3323eec92009-02-04 09:06:58 -05001/*
2 * Copyright (C) 2008 IBM Corporation
3 * Author: Mimi Zohar <zohar@us.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
8 *
9 * ima_policy.c
10 * - initialize default measure policy rules
11 *
12 */
13#include <linux/module.h>
14#include <linux/list.h>
Mimi Zohar3323eec92009-02-04 09:06:58 -050015#include <linux/security.h>
16#include <linux/magic.h>
Mimi Zohar4af46622009-02-04 09:07:00 -050017#include <linux/parser.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Mimi Zohar3323eec92009-02-04 09:06:58 -050019
20#include "ima.h"
21
22/* flags definitions */
23#define IMA_FUNC 0x0001
24#define IMA_MASK 0x0002
25#define IMA_FSMAGIC 0x0004
26#define IMA_UID 0x0008
27
Mimi Zohar4af46622009-02-04 09:07:00 -050028enum ima_action { UNKNOWN = -1, DONT_MEASURE = 0, MEASURE };
29
30#define MAX_LSM_RULES 6
31enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE,
32 LSM_SUBJ_USER, LSM_SUBJ_ROLE, LSM_SUBJ_TYPE
33};
Mimi Zohar3323eec92009-02-04 09:06:58 -050034
35struct ima_measure_rule_entry {
36 struct list_head list;
37 enum ima_action action;
38 unsigned int flags;
39 enum ima_hooks func;
40 int mask;
41 unsigned long fsmagic;
42 uid_t uid;
Mimi Zohar4af46622009-02-04 09:07:00 -050043 struct {
44 void *rule; /* LSM file metadata specific */
45 int type; /* audit type */
46 } lsm[MAX_LSM_RULES];
Mimi Zohar3323eec92009-02-04 09:06:58 -050047};
48
Eric Paris5789ba32009-05-21 15:47:06 -040049/*
50 * Without LSM specific knowledge, the default policy can only be
Mimi Zohar4af46622009-02-04 09:07:00 -050051 * written in terms of .action, .func, .mask, .fsmagic, and .uid
52 */
Eric Paris5789ba32009-05-21 15:47:06 -040053
54/*
55 * The minimum rule set to allow for full TCB coverage. Measures all files
56 * opened or mmap for exec and everything read by root. Dangerous because
57 * normal users can easily run the machine out of memory simply building
58 * and running executables.
59 */
Mimi Zohar3323eec92009-02-04 09:06:58 -050060static struct ima_measure_rule_entry default_rules[] = {
Eric Paris75834fc2009-05-18 10:26:10 -040061 {.action = DONT_MEASURE,.fsmagic = PROC_SUPER_MAGIC,.flags = IMA_FSMAGIC},
Mimi Zohar3323eec92009-02-04 09:06:58 -050062 {.action = DONT_MEASURE,.fsmagic = SYSFS_MAGIC,.flags = IMA_FSMAGIC},
63 {.action = DONT_MEASURE,.fsmagic = DEBUGFS_MAGIC,.flags = IMA_FSMAGIC},
64 {.action = DONT_MEASURE,.fsmagic = TMPFS_MAGIC,.flags = IMA_FSMAGIC},
Eric Paris75834fc2009-05-18 10:26:10 -040065 {.action = DONT_MEASURE,.fsmagic = SECURITYFS_MAGIC,.flags = IMA_FSMAGIC},
66 {.action = DONT_MEASURE,.fsmagic = SELINUX_MAGIC,.flags = IMA_FSMAGIC},
Mimi Zohar3323eec92009-02-04 09:06:58 -050067 {.action = MEASURE,.func = FILE_MMAP,.mask = MAY_EXEC,
68 .flags = IMA_FUNC | IMA_MASK},
69 {.action = MEASURE,.func = BPRM_CHECK,.mask = MAY_EXEC,
70 .flags = IMA_FUNC | IMA_MASK},
Mimi Zohar1e93d002010-01-26 17:02:41 -050071 {.action = MEASURE,.func = FILE_CHECK,.mask = MAY_READ,.uid = 0,
Eric Paris5789ba32009-05-21 15:47:06 -040072 .flags = IMA_FUNC | IMA_MASK | IMA_UID},
Mimi Zohar3323eec92009-02-04 09:06:58 -050073};
74
75static LIST_HEAD(measure_default_rules);
Mimi Zohar4af46622009-02-04 09:07:00 -050076static LIST_HEAD(measure_policy_rules);
Mimi Zohar3323eec92009-02-04 09:06:58 -050077static struct list_head *ima_measure;
78
Mimi Zohar4af46622009-02-04 09:07:00 -050079static DEFINE_MUTEX(ima_measure_mutex);
80
Eric Paris5789ba32009-05-21 15:47:06 -040081static bool ima_use_tcb __initdata;
82static int __init default_policy_setup(char *str)
83{
84 ima_use_tcb = 1;
85 return 1;
86}
87__setup("ima_tcb", default_policy_setup);
88
Mimi Zohar3323eec92009-02-04 09:06:58 -050089/**
90 * ima_match_rules - determine whether an inode matches the measure rule.
91 * @rule: a pointer to a rule
92 * @inode: a pointer to an inode
93 * @func: LIM hook identifier
94 * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
95 *
96 * Returns true on rule match, false on failure.
97 */
98static bool ima_match_rules(struct ima_measure_rule_entry *rule,
99 struct inode *inode, enum ima_hooks func, int mask)
100{
101 struct task_struct *tsk = current;
Mimi Zohar4af46622009-02-04 09:07:00 -0500102 int i;
Mimi Zohar3323eec92009-02-04 09:06:58 -0500103
104 if ((rule->flags & IMA_FUNC) && rule->func != func)
105 return false;
106 if ((rule->flags & IMA_MASK) && rule->mask != mask)
107 return false;
108 if ((rule->flags & IMA_FSMAGIC)
109 && rule->fsmagic != inode->i_sb->s_magic)
110 return false;
111 if ((rule->flags & IMA_UID) && rule->uid != tsk->cred->uid)
112 return false;
Mimi Zohar4af46622009-02-04 09:07:00 -0500113 for (i = 0; i < MAX_LSM_RULES; i++) {
Mimi Zohar53fc0e22009-05-05 13:12:48 -0400114 int rc = 0;
Mimi Zohar4af46622009-02-04 09:07:00 -0500115 u32 osid, sid;
116
117 if (!rule->lsm[i].rule)
118 continue;
119
120 switch (i) {
121 case LSM_OBJ_USER:
122 case LSM_OBJ_ROLE:
123 case LSM_OBJ_TYPE:
124 security_inode_getsecid(inode, &osid);
125 rc = security_filter_rule_match(osid,
126 rule->lsm[i].type,
Mimi Zohar53fc0e22009-05-05 13:12:48 -0400127 Audit_equal,
Mimi Zohar4af46622009-02-04 09:07:00 -0500128 rule->lsm[i].rule,
129 NULL);
130 break;
131 case LSM_SUBJ_USER:
132 case LSM_SUBJ_ROLE:
133 case LSM_SUBJ_TYPE:
134 security_task_getsecid(tsk, &sid);
135 rc = security_filter_rule_match(sid,
136 rule->lsm[i].type,
Mimi Zohar53fc0e22009-05-05 13:12:48 -0400137 Audit_equal,
Mimi Zohar4af46622009-02-04 09:07:00 -0500138 rule->lsm[i].rule,
139 NULL);
140 default:
141 break;
142 }
143 if (!rc)
144 return false;
145 }
Mimi Zohar3323eec92009-02-04 09:06:58 -0500146 return true;
147}
148
149/**
150 * ima_match_policy - decision based on LSM and other conditions
151 * @inode: pointer to an inode for which the policy decision is being made
152 * @func: IMA hook identifier
153 * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
154 *
155 * Measure decision based on func/mask/fsmagic and LSM(subj/obj/type)
156 * conditions.
157 *
158 * (There is no need for locking when walking the policy list,
159 * as elements in the list are never deleted, nor does the list
160 * change.)
161 */
162int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask)
163{
164 struct ima_measure_rule_entry *entry;
165
166 list_for_each_entry(entry, ima_measure, list) {
167 bool rc;
168
169 rc = ima_match_rules(entry, inode, func, mask);
170 if (rc)
171 return entry->action;
172 }
173 return 0;
174}
175
176/**
177 * ima_init_policy - initialize the default measure rules.
178 *
Mimi Zohar3323eec92009-02-04 09:06:58 -0500179 * ima_measure points to either the measure_default_rules or the
Mimi Zohar4af46622009-02-04 09:07:00 -0500180 * the new measure_policy_rules.
Mimi Zohar3323eec92009-02-04 09:06:58 -0500181 */
Eric Paris932995f2009-05-21 15:43:32 -0400182void __init ima_init_policy(void)
Mimi Zohar3323eec92009-02-04 09:06:58 -0500183{
Eric Paris5789ba32009-05-21 15:47:06 -0400184 int i, entries;
Mimi Zohar3323eec92009-02-04 09:06:58 -0500185
Eric Paris5789ba32009-05-21 15:47:06 -0400186 /* if !ima_use_tcb set entries = 0 so we load NO default rules */
187 if (ima_use_tcb)
188 entries = ARRAY_SIZE(default_rules);
189 else
190 entries = 0;
191
192 for (i = 0; i < entries; i++)
Mimi Zohar3323eec92009-02-04 09:06:58 -0500193 list_add_tail(&default_rules[i].list, &measure_default_rules);
194 ima_measure = &measure_default_rules;
195}
Mimi Zohar4af46622009-02-04 09:07:00 -0500196
197/**
198 * ima_update_policy - update default_rules with new measure rules
199 *
200 * Called on file .release to update the default rules with a complete new
201 * policy. Once updated, the policy is locked, no additional rules can be
202 * added to the policy.
203 */
204void ima_update_policy(void)
205{
206 const char *op = "policy_update";
207 const char *cause = "already exists";
208 int result = 1;
209 int audit_info = 0;
210
211 if (ima_measure == &measure_default_rules) {
212 ima_measure = &measure_policy_rules;
213 cause = "complete";
214 result = 0;
215 }
216 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
217 NULL, op, cause, result, audit_info);
218}
219
220enum {
221 Opt_err = -1,
222 Opt_measure = 1, Opt_dont_measure,
223 Opt_obj_user, Opt_obj_role, Opt_obj_type,
224 Opt_subj_user, Opt_subj_role, Opt_subj_type,
225 Opt_func, Opt_mask, Opt_fsmagic, Opt_uid
226};
227
228static match_table_t policy_tokens = {
229 {Opt_measure, "measure"},
230 {Opt_dont_measure, "dont_measure"},
231 {Opt_obj_user, "obj_user=%s"},
232 {Opt_obj_role, "obj_role=%s"},
233 {Opt_obj_type, "obj_type=%s"},
234 {Opt_subj_user, "subj_user=%s"},
235 {Opt_subj_role, "subj_role=%s"},
236 {Opt_subj_type, "subj_type=%s"},
237 {Opt_func, "func=%s"},
238 {Opt_mask, "mask=%s"},
239 {Opt_fsmagic, "fsmagic=%s"},
240 {Opt_uid, "uid=%s"},
241 {Opt_err, NULL}
242};
243
244static int ima_lsm_rule_init(struct ima_measure_rule_entry *entry,
245 char *args, int lsm_rule, int audit_type)
246{
247 int result;
248
Eric Paris7b62e162010-04-20 10:21:01 -0400249 if (entry->lsm[lsm_rule].rule)
250 return -EINVAL;
251
Mimi Zohar4af46622009-02-04 09:07:00 -0500252 entry->lsm[lsm_rule].type = audit_type;
253 result = security_filter_rule_init(entry->lsm[lsm_rule].type,
Mimi Zohar53fc0e22009-05-05 13:12:48 -0400254 Audit_equal, args,
Mimi Zohar4af46622009-02-04 09:07:00 -0500255 &entry->lsm[lsm_rule].rule);
256 return result;
257}
258
Eric Paris2f1506c2010-04-20 10:21:30 -0400259static void ima_log_string(struct audit_buffer *ab, char *key, char *value)
260{
261 audit_log_format(ab, "%s=", key);
262 audit_log_untrustedstring(ab, value);
263 audit_log_format(ab, " ");
264}
265
Mimi Zohar4af46622009-02-04 09:07:00 -0500266static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
267{
268 struct audit_buffer *ab;
269 char *p;
270 int result = 0;
271
Mimi Zohar523979a2009-02-11 11:12:28 -0500272 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE);
Mimi Zohar4af46622009-02-04 09:07:00 -0500273
Eric Paris7b62e162010-04-20 10:21:01 -0400274 entry->uid = -1;
Eric Parisb9035b12010-04-20 10:21:07 -0400275 entry->action = UNKNOWN;
Eric Paris28ef4002010-04-20 10:21:18 -0400276 while ((p = strsep(&rule, " \t")) != NULL) {
Mimi Zohar4af46622009-02-04 09:07:00 -0500277 substring_t args[MAX_OPT_ARGS];
278 int token;
279 unsigned long lnum;
280
281 if (result < 0)
282 break;
Eric Paris28ef4002010-04-20 10:21:18 -0400283 if ((*p == '\0') || (*p == ' ') || (*p == '\t'))
284 continue;
Mimi Zohar4af46622009-02-04 09:07:00 -0500285 token = match_token(p, policy_tokens, args);
286 switch (token) {
287 case Opt_measure:
Eric Paris2f1506c2010-04-20 10:21:30 -0400288 ima_log_string(ab, "action", "measure");
Eric Paris7b62e162010-04-20 10:21:01 -0400289
290 if (entry->action != UNKNOWN)
291 result = -EINVAL;
292
Mimi Zohar4af46622009-02-04 09:07:00 -0500293 entry->action = MEASURE;
294 break;
295 case Opt_dont_measure:
Eric Paris2f1506c2010-04-20 10:21:30 -0400296 ima_log_string(ab, "action", "dont_measure");
Eric Paris7b62e162010-04-20 10:21:01 -0400297
298 if (entry->action != UNKNOWN)
299 result = -EINVAL;
300
Mimi Zohar4af46622009-02-04 09:07:00 -0500301 entry->action = DONT_MEASURE;
302 break;
303 case Opt_func:
Eric Paris2f1506c2010-04-20 10:21:30 -0400304 ima_log_string(ab, "func", args[0].from);
Eric Paris7b62e162010-04-20 10:21:01 -0400305
306 if (entry->func)
307 result = -EINVAL;
308
Mimi Zohar1e93d002010-01-26 17:02:41 -0500309 if (strcmp(args[0].from, "FILE_CHECK") == 0)
310 entry->func = FILE_CHECK;
311 /* PATH_CHECK is for backwards compat */
312 else if (strcmp(args[0].from, "PATH_CHECK") == 0)
313 entry->func = FILE_CHECK;
Mimi Zohar4af46622009-02-04 09:07:00 -0500314 else if (strcmp(args[0].from, "FILE_MMAP") == 0)
315 entry->func = FILE_MMAP;
316 else if (strcmp(args[0].from, "BPRM_CHECK") == 0)
317 entry->func = BPRM_CHECK;
318 else
319 result = -EINVAL;
320 if (!result)
321 entry->flags |= IMA_FUNC;
322 break;
323 case Opt_mask:
Eric Paris2f1506c2010-04-20 10:21:30 -0400324 ima_log_string(ab, "mask", args[0].from);
Eric Paris7b62e162010-04-20 10:21:01 -0400325
326 if (entry->mask)
327 result = -EINVAL;
328
Mimi Zohar4af46622009-02-04 09:07:00 -0500329 if ((strcmp(args[0].from, "MAY_EXEC")) == 0)
330 entry->mask = MAY_EXEC;
331 else if (strcmp(args[0].from, "MAY_WRITE") == 0)
332 entry->mask = MAY_WRITE;
333 else if (strcmp(args[0].from, "MAY_READ") == 0)
334 entry->mask = MAY_READ;
335 else if (strcmp(args[0].from, "MAY_APPEND") == 0)
336 entry->mask = MAY_APPEND;
337 else
338 result = -EINVAL;
339 if (!result)
340 entry->flags |= IMA_MASK;
341 break;
342 case Opt_fsmagic:
Eric Paris2f1506c2010-04-20 10:21:30 -0400343 ima_log_string(ab, "fsmagic", args[0].from);
Eric Paris7b62e162010-04-20 10:21:01 -0400344
345 if (entry->fsmagic) {
346 result = -EINVAL;
347 break;
348 }
349
Mimi Zohar4af46622009-02-04 09:07:00 -0500350 result = strict_strtoul(args[0].from, 16,
351 &entry->fsmagic);
352 if (!result)
353 entry->flags |= IMA_FSMAGIC;
354 break;
355 case Opt_uid:
Eric Paris2f1506c2010-04-20 10:21:30 -0400356 ima_log_string(ab, "uid", args[0].from);
Eric Paris7b62e162010-04-20 10:21:01 -0400357
358 if (entry->uid != -1) {
359 result = -EINVAL;
360 break;
361 }
362
Mimi Zohar4af46622009-02-04 09:07:00 -0500363 result = strict_strtoul(args[0].from, 10, &lnum);
364 if (!result) {
365 entry->uid = (uid_t) lnum;
366 if (entry->uid != lnum)
367 result = -EINVAL;
368 else
369 entry->flags |= IMA_UID;
370 }
371 break;
372 case Opt_obj_user:
Eric Paris2f1506c2010-04-20 10:21:30 -0400373 ima_log_string(ab, "obj_user", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500374 result = ima_lsm_rule_init(entry, args[0].from,
375 LSM_OBJ_USER,
376 AUDIT_OBJ_USER);
377 break;
378 case Opt_obj_role:
Eric Paris2f1506c2010-04-20 10:21:30 -0400379 ima_log_string(ab, "obj_role", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500380 result = ima_lsm_rule_init(entry, args[0].from,
381 LSM_OBJ_ROLE,
382 AUDIT_OBJ_ROLE);
383 break;
384 case Opt_obj_type:
Eric Paris2f1506c2010-04-20 10:21:30 -0400385 ima_log_string(ab, "obj_type", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500386 result = ima_lsm_rule_init(entry, args[0].from,
387 LSM_OBJ_TYPE,
388 AUDIT_OBJ_TYPE);
389 break;
390 case Opt_subj_user:
Eric Paris2f1506c2010-04-20 10:21:30 -0400391 ima_log_string(ab, "subj_user", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500392 result = ima_lsm_rule_init(entry, args[0].from,
393 LSM_SUBJ_USER,
394 AUDIT_SUBJ_USER);
395 break;
396 case Opt_subj_role:
Eric Paris2f1506c2010-04-20 10:21:30 -0400397 ima_log_string(ab, "subj_role", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500398 result = ima_lsm_rule_init(entry, args[0].from,
399 LSM_SUBJ_ROLE,
400 AUDIT_SUBJ_ROLE);
401 break;
402 case Opt_subj_type:
Eric Paris2f1506c2010-04-20 10:21:30 -0400403 ima_log_string(ab, "subj_type", args[0].from);
Mimi Zohar4af46622009-02-04 09:07:00 -0500404 result = ima_lsm_rule_init(entry, args[0].from,
405 LSM_SUBJ_TYPE,
406 AUDIT_SUBJ_TYPE);
407 break;
408 case Opt_err:
Eric Paris2f1506c2010-04-20 10:21:30 -0400409 ima_log_string(ab, "UNKNOWN", p);
Eric Parise9d393b2010-04-20 10:21:13 -0400410 result = -EINVAL;
Mimi Zohar4af46622009-02-04 09:07:00 -0500411 break;
412 }
413 }
Eric Paris7b62e162010-04-20 10:21:01 -0400414 if (!result && (entry->action == UNKNOWN))
Mimi Zohar4af46622009-02-04 09:07:00 -0500415 result = -EINVAL;
416
Eric Paris6ccd0452010-04-20 10:20:54 -0400417 audit_log_format(ab, "res=%d", !!result);
Mimi Zohar4af46622009-02-04 09:07:00 -0500418 audit_log_end(ab);
419 return result;
420}
421
422/**
423 * ima_parse_add_rule - add a rule to measure_policy_rules
424 * @rule - ima measurement policy rule
425 *
426 * Uses a mutex to protect the policy list from multiple concurrent writers.
Eric Paris6ccd0452010-04-20 10:20:54 -0400427 * Returns the length of the rule parsed, an error code on failure
Mimi Zohar4af46622009-02-04 09:07:00 -0500428 */
Eric Paris6ccd0452010-04-20 10:20:54 -0400429ssize_t ima_parse_add_rule(char *rule)
Mimi Zohar4af46622009-02-04 09:07:00 -0500430{
Mimi Zohar523979a2009-02-11 11:12:28 -0500431 const char *op = "update_policy";
Eric Paris6ccd0452010-04-20 10:20:54 -0400432 char *p;
Mimi Zohar4af46622009-02-04 09:07:00 -0500433 struct ima_measure_rule_entry *entry;
Eric Paris6ccd0452010-04-20 10:20:54 -0400434 ssize_t result, len;
Mimi Zohar4af46622009-02-04 09:07:00 -0500435 int audit_info = 0;
436
437 /* Prevent installed policy from changing */
438 if (ima_measure != &measure_default_rules) {
439 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
440 NULL, op, "already exists",
441 -EACCES, audit_info);
442 return -EACCES;
443 }
444
445 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
446 if (!entry) {
447 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
448 NULL, op, "-ENOMEM", -ENOMEM, audit_info);
449 return -ENOMEM;
450 }
451
452 INIT_LIST_HEAD(&entry->list);
453
Eric Paris6ccd0452010-04-20 10:20:54 -0400454 p = strsep(&rule, "\n");
455 len = strlen(p) + 1;
Eric Paris7233e3e2010-04-20 10:21:24 -0400456
457 if (*p == '#') {
458 kfree(entry);
459 return len;
460 }
461
Eric Paris6ccd0452010-04-20 10:20:54 -0400462 result = ima_parse_rule(p, entry);
Eric Paris7233e3e2010-04-20 10:21:24 -0400463 if (result) {
Mimi Zohar4af46622009-02-04 09:07:00 -0500464 kfree(entry);
Mimi Zohar523979a2009-02-11 11:12:28 -0500465 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
466 NULL, op, "invalid policy", result,
467 audit_info);
Eric Paris7233e3e2010-04-20 10:21:24 -0400468 return result;
Mimi Zohar523979a2009-02-11 11:12:28 -0500469 }
Eric Paris7233e3e2010-04-20 10:21:24 -0400470
471 mutex_lock(&ima_measure_mutex);
472 list_add_tail(&entry->list, &measure_policy_rules);
473 mutex_unlock(&ima_measure_mutex);
474
475 return len;
Mimi Zohar4af46622009-02-04 09:07:00 -0500476}
477
478/* ima_delete_rules called to cleanup invalid policy */
James Morris64c61d82009-02-05 09:28:26 +1100479void ima_delete_rules(void)
Mimi Zohar4af46622009-02-04 09:07:00 -0500480{
481 struct ima_measure_rule_entry *entry, *tmp;
482
483 mutex_lock(&ima_measure_mutex);
484 list_for_each_entry_safe(entry, tmp, &measure_policy_rules, list) {
485 list_del(&entry->list);
486 kfree(entry);
487 }
488 mutex_unlock(&ima_measure_mutex);
489}