David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1 | /* auditfilter.c -- filtering of audit events |
| 2 | * |
| 3 | * Copyright 2003-2004 Red Hat, Inc. |
| 4 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
| 5 | * Copyright 2005 IBM Corporation |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 22 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 23 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 24 | #include <linux/kernel.h> |
| 25 | #include <linux/audit.h> |
| 26 | #include <linux/kthread.h> |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 27 | #include <linux/mutex.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/namei.h> |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 30 | #include <linux/netlink.h> |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 31 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 33 | #include <linux/security.h> |
Eric W. Biederman | 48095d9 | 2014-02-03 17:25:33 -0800 | [diff] [blame] | 34 | #include <net/net_namespace.h> |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 35 | #include <net/sock.h> |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 36 | #include "audit.h" |
| 37 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 38 | /* |
| 39 | * Locking model: |
| 40 | * |
| 41 | * audit_filter_mutex: |
Scott Matheina | 725131e | 2015-11-04 08:23:51 -0500 | [diff] [blame] | 42 | * Synchronizes writes and blocking reads of audit's filterlist |
| 43 | * data. Rcu is used to traverse the filterlist and access |
| 44 | * contents of structs audit_entry, audit_watch and opaque |
| 45 | * LSM rules during filtering. If modified, these structures |
| 46 | * must be copied and replace their counterparts in the filterlist. |
| 47 | * An audit_parent struct is not accessed during filtering, so may |
| 48 | * be written directly provided audit_filter_mutex is held. |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 49 | */ |
| 50 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 51 | /* Audit filter lists, defined in <linux/audit.h> */ |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 52 | struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { |
| 53 | LIST_HEAD_INIT(audit_filter_list[0]), |
| 54 | LIST_HEAD_INIT(audit_filter_list[1]), |
| 55 | LIST_HEAD_INIT(audit_filter_list[2]), |
| 56 | LIST_HEAD_INIT(audit_filter_list[3]), |
| 57 | LIST_HEAD_INIT(audit_filter_list[4]), |
| 58 | LIST_HEAD_INIT(audit_filter_list[5]), |
| 59 | #if AUDIT_NR_FILTERS != 6 |
| 60 | #error Fix audit_filter_list initialiser |
| 61 | #endif |
| 62 | }; |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 63 | static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = { |
| 64 | LIST_HEAD_INIT(audit_rules_list[0]), |
| 65 | LIST_HEAD_INIT(audit_rules_list[1]), |
| 66 | LIST_HEAD_INIT(audit_rules_list[2]), |
| 67 | LIST_HEAD_INIT(audit_rules_list[3]), |
| 68 | LIST_HEAD_INIT(audit_rules_list[4]), |
| 69 | LIST_HEAD_INIT(audit_rules_list[5]), |
| 70 | }; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 71 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 72 | DEFINE_MUTEX(audit_filter_mutex); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 73 | |
Richard Guy Briggs | 219ca39 | 2014-03-26 07:26:47 -0400 | [diff] [blame] | 74 | static void audit_free_lsm_field(struct audit_field *f) |
| 75 | { |
| 76 | switch (f->type) { |
| 77 | case AUDIT_SUBJ_USER: |
| 78 | case AUDIT_SUBJ_ROLE: |
| 79 | case AUDIT_SUBJ_TYPE: |
| 80 | case AUDIT_SUBJ_SEN: |
| 81 | case AUDIT_SUBJ_CLR: |
| 82 | case AUDIT_OBJ_USER: |
| 83 | case AUDIT_OBJ_ROLE: |
| 84 | case AUDIT_OBJ_TYPE: |
| 85 | case AUDIT_OBJ_LEV_LOW: |
| 86 | case AUDIT_OBJ_LEV_HIGH: |
| 87 | kfree(f->lsm_str); |
| 88 | security_audit_rule_free(f->lsm_rule); |
| 89 | } |
| 90 | } |
| 91 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 92 | static inline void audit_free_rule(struct audit_entry *e) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 93 | { |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 94 | int i; |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 95 | struct audit_krule *erule = &e->rule; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 96 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 97 | /* some rules don't have associated watches */ |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 98 | if (erule->watch) |
| 99 | audit_put_watch(erule->watch); |
| 100 | if (erule->fields) |
Richard Guy Briggs | 219ca39 | 2014-03-26 07:26:47 -0400 | [diff] [blame] | 101 | for (i = 0; i < erule->field_count; i++) |
| 102 | audit_free_lsm_field(&erule->fields[i]); |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 103 | kfree(erule->fields); |
| 104 | kfree(erule->filterkey); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 105 | kfree(e); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 106 | } |
| 107 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 108 | void audit_free_rule_rcu(struct rcu_head *head) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 109 | { |
| 110 | struct audit_entry *e = container_of(head, struct audit_entry, rcu); |
| 111 | audit_free_rule(e); |
| 112 | } |
| 113 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 114 | /* Initialize an audit filterlist entry. */ |
| 115 | static inline struct audit_entry *audit_init_entry(u32 field_count) |
| 116 | { |
| 117 | struct audit_entry *entry; |
| 118 | struct audit_field *fields; |
| 119 | |
| 120 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 121 | if (unlikely(!entry)) |
| 122 | return NULL; |
| 123 | |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 124 | fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 125 | if (unlikely(!fields)) { |
| 126 | kfree(entry); |
| 127 | return NULL; |
| 128 | } |
| 129 | entry->rule.fields = fields; |
| 130 | |
| 131 | return entry; |
| 132 | } |
| 133 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 134 | /* Unpack a filter field's string representation from user-space |
| 135 | * buffer. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 136 | char *audit_unpack_string(void **bufp, size_t *remain, size_t len) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 137 | { |
| 138 | char *str; |
| 139 | |
| 140 | if (!*bufp || (len == 0) || (len > *remain)) |
| 141 | return ERR_PTR(-EINVAL); |
| 142 | |
| 143 | /* Of the currently implemented string fields, PATH_MAX |
| 144 | * defines the longest valid length. |
| 145 | */ |
| 146 | if (len > PATH_MAX) |
| 147 | return ERR_PTR(-ENAMETOOLONG); |
| 148 | |
| 149 | str = kmalloc(len + 1, GFP_KERNEL); |
| 150 | if (unlikely(!str)) |
| 151 | return ERR_PTR(-ENOMEM); |
| 152 | |
| 153 | memcpy(str, *bufp, len); |
| 154 | str[len] = 0; |
| 155 | *bufp += len; |
| 156 | *remain -= len; |
| 157 | |
| 158 | return str; |
| 159 | } |
| 160 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 161 | /* Translate an inode field to kernel representation. */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 162 | static inline int audit_to_inode(struct audit_krule *krule, |
| 163 | struct audit_field *f) |
| 164 | { |
| 165 | if (krule->listnr != AUDIT_FILTER_EXIT || |
Richard Guy Briggs | 3639f17 | 2014-10-02 22:05:18 -0400 | [diff] [blame] | 166 | krule->inode_f || krule->watch || krule->tree || |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 167 | (f->op != Audit_equal && f->op != Audit_not_equal)) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 168 | return -EINVAL; |
| 169 | |
| 170 | krule->inode_f = f; |
| 171 | return 0; |
| 172 | } |
| 173 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 174 | static __u32 *classes[AUDIT_SYSCALL_CLASSES]; |
| 175 | |
| 176 | int __init audit_register_class(int class, unsigned *list) |
| 177 | { |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 178 | __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL); |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 179 | if (!p) |
| 180 | return -ENOMEM; |
| 181 | while (*list != ~0U) { |
| 182 | unsigned n = *list++; |
| 183 | if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) { |
| 184 | kfree(p); |
| 185 | return -EINVAL; |
| 186 | } |
| 187 | p[AUDIT_WORD(n)] |= AUDIT_BIT(n); |
| 188 | } |
| 189 | if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) { |
| 190 | kfree(p); |
| 191 | return -EINVAL; |
| 192 | } |
| 193 | classes[class] = p; |
| 194 | return 0; |
| 195 | } |
| 196 | |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 197 | int audit_match_class(int class, unsigned syscall) |
| 198 | { |
Klaus Weidner | c926e4f | 2007-05-16 17:45:42 -0500 | [diff] [blame] | 199 | if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32)) |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 200 | return 0; |
| 201 | if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class])) |
| 202 | return 0; |
| 203 | return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall); |
| 204 | } |
| 205 | |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 206 | #ifdef CONFIG_AUDITSYSCALL |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 207 | static inline int audit_match_class_bits(int class, u32 *mask) |
| 208 | { |
| 209 | int i; |
| 210 | |
| 211 | if (classes[class]) { |
| 212 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 213 | if (mask[i] & classes[class][i]) |
| 214 | return 0; |
| 215 | } |
| 216 | return 1; |
| 217 | } |
| 218 | |
| 219 | static int audit_match_signal(struct audit_entry *entry) |
| 220 | { |
| 221 | struct audit_field *arch = entry->rule.arch_f; |
| 222 | |
| 223 | if (!arch) { |
| 224 | /* When arch is unspecified, we must check both masks on biarch |
| 225 | * as syscall number alone is ambiguous. */ |
| 226 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 227 | entry->rule.mask) && |
| 228 | audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 229 | entry->rule.mask)); |
| 230 | } |
| 231 | |
| 232 | switch(audit_classify_arch(arch->val)) { |
| 233 | case 0: /* native */ |
| 234 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 235 | entry->rule.mask)); |
| 236 | case 1: /* 32bit on biarch */ |
| 237 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 238 | entry->rule.mask)); |
| 239 | default: |
| 240 | return 1; |
| 241 | } |
| 242 | } |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 243 | #endif |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 244 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 245 | /* Common user-space to kernel rule translation. */ |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 246 | static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 247 | { |
| 248 | unsigned listnr; |
| 249 | struct audit_entry *entry; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 250 | int i, err; |
| 251 | |
| 252 | err = -EINVAL; |
| 253 | listnr = rule->flags & ~AUDIT_FILTER_PREPEND; |
| 254 | switch(listnr) { |
| 255 | default: |
| 256 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 257 | #ifdef CONFIG_AUDITSYSCALL |
| 258 | case AUDIT_FILTER_ENTRY: |
Eric Paris | 7ff68e5 | 2012-01-03 14:23:07 -0500 | [diff] [blame] | 259 | if (rule->action == AUDIT_ALWAYS) |
| 260 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 261 | case AUDIT_FILTER_EXIT: |
| 262 | case AUDIT_FILTER_TASK: |
| 263 | #endif |
Eric Paris | 7ff68e5 | 2012-01-03 14:23:07 -0500 | [diff] [blame] | 264 | case AUDIT_FILTER_USER: |
| 265 | case AUDIT_FILTER_TYPE: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 266 | ; |
| 267 | } |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 268 | if (unlikely(rule->action == AUDIT_POSSIBLE)) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 269 | pr_err("AUDIT_POSSIBLE is deprecated\n"); |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 270 | goto exit_err; |
| 271 | } |
| 272 | if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 273 | goto exit_err; |
| 274 | if (rule->field_count > AUDIT_MAX_FIELDS) |
| 275 | goto exit_err; |
| 276 | |
| 277 | err = -ENOMEM; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 278 | entry = audit_init_entry(rule->field_count); |
| 279 | if (!entry) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 280 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 281 | |
| 282 | entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND; |
| 283 | entry->rule.listnr = listnr; |
| 284 | entry->rule.action = rule->action; |
| 285 | entry->rule.field_count = rule->field_count; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 286 | |
| 287 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 288 | entry->rule.mask[i] = rule->mask[i]; |
| 289 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 290 | for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) { |
| 291 | int bit = AUDIT_BITMASK_SIZE * 32 - i - 1; |
| 292 | __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)]; |
| 293 | __u32 *class; |
| 294 | |
| 295 | if (!(*p & AUDIT_BIT(bit))) |
| 296 | continue; |
| 297 | *p &= ~AUDIT_BIT(bit); |
| 298 | class = classes[i]; |
| 299 | if (class) { |
| 300 | int j; |
| 301 | for (j = 0; j < AUDIT_BITMASK_SIZE; j++) |
| 302 | entry->rule.mask[j] |= class[j]; |
| 303 | } |
| 304 | } |
| 305 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 306 | return entry; |
| 307 | |
| 308 | exit_err: |
| 309 | return ERR_PTR(err); |
| 310 | } |
| 311 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 312 | static u32 audit_ops[] = |
| 313 | { |
| 314 | [Audit_equal] = AUDIT_EQUAL, |
| 315 | [Audit_not_equal] = AUDIT_NOT_EQUAL, |
| 316 | [Audit_bitmask] = AUDIT_BIT_MASK, |
| 317 | [Audit_bittest] = AUDIT_BIT_TEST, |
| 318 | [Audit_lt] = AUDIT_LESS_THAN, |
| 319 | [Audit_gt] = AUDIT_GREATER_THAN, |
| 320 | [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL, |
| 321 | [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL, |
| 322 | }; |
| 323 | |
| 324 | static u32 audit_to_op(u32 op) |
| 325 | { |
| 326 | u32 n; |
| 327 | for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++) |
| 328 | ; |
| 329 | return n; |
| 330 | } |
| 331 | |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 332 | /* check if an audit field is valid */ |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 333 | static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 334 | { |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 335 | switch(f->type) { |
| 336 | case AUDIT_MSGTYPE: |
| 337 | if (entry->rule.listnr != AUDIT_FILTER_TYPE && |
| 338 | entry->rule.listnr != AUDIT_FILTER_USER) |
| 339 | return -EINVAL; |
| 340 | break; |
| 341 | }; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 342 | |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 343 | switch(f->type) { |
| 344 | default: |
| 345 | return -EINVAL; |
| 346 | case AUDIT_UID: |
| 347 | case AUDIT_EUID: |
| 348 | case AUDIT_SUID: |
| 349 | case AUDIT_FSUID: |
| 350 | case AUDIT_LOGINUID: |
| 351 | case AUDIT_OBJ_UID: |
| 352 | case AUDIT_GID: |
| 353 | case AUDIT_EGID: |
| 354 | case AUDIT_SGID: |
| 355 | case AUDIT_FSGID: |
| 356 | case AUDIT_OBJ_GID: |
| 357 | case AUDIT_PID: |
| 358 | case AUDIT_PERS: |
| 359 | case AUDIT_MSGTYPE: |
| 360 | case AUDIT_PPID: |
| 361 | case AUDIT_DEVMAJOR: |
| 362 | case AUDIT_DEVMINOR: |
| 363 | case AUDIT_EXIT: |
| 364 | case AUDIT_SUCCESS: |
Eric Paris | 7812203 | 2013-09-04 15:01:43 -0400 | [diff] [blame] | 365 | case AUDIT_INODE: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 366 | /* bit ops are only useful on syscall args */ |
| 367 | if (f->op == Audit_bitmask || f->op == Audit_bittest) |
| 368 | return -EINVAL; |
| 369 | break; |
| 370 | case AUDIT_ARG0: |
| 371 | case AUDIT_ARG1: |
| 372 | case AUDIT_ARG2: |
| 373 | case AUDIT_ARG3: |
| 374 | case AUDIT_SUBJ_USER: |
| 375 | case AUDIT_SUBJ_ROLE: |
| 376 | case AUDIT_SUBJ_TYPE: |
| 377 | case AUDIT_SUBJ_SEN: |
| 378 | case AUDIT_SUBJ_CLR: |
| 379 | case AUDIT_OBJ_USER: |
| 380 | case AUDIT_OBJ_ROLE: |
| 381 | case AUDIT_OBJ_TYPE: |
| 382 | case AUDIT_OBJ_LEV_LOW: |
| 383 | case AUDIT_OBJ_LEV_HIGH: |
| 384 | case AUDIT_WATCH: |
| 385 | case AUDIT_DIR: |
| 386 | case AUDIT_FILTERKEY: |
| 387 | break; |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 388 | case AUDIT_LOGINUID_SET: |
| 389 | if ((f->val != 0) && (f->val != 1)) |
| 390 | return -EINVAL; |
| 391 | /* FALL THROUGH */ |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 392 | case AUDIT_ARCH: |
| 393 | if (f->op != Audit_not_equal && f->op != Audit_equal) |
| 394 | return -EINVAL; |
| 395 | break; |
| 396 | case AUDIT_PERM: |
| 397 | if (f->val & ~15) |
| 398 | return -EINVAL; |
| 399 | break; |
| 400 | case AUDIT_FILETYPE: |
| 401 | if (f->val & ~S_IFMT) |
| 402 | return -EINVAL; |
| 403 | break; |
| 404 | case AUDIT_FIELD_COMPARE: |
| 405 | if (f->val > AUDIT_MAX_FIELD_COMPARE) |
| 406 | return -EINVAL; |
| 407 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 408 | case AUDIT_EXE: |
| 409 | if (f->op != Audit_equal) |
| 410 | return -EINVAL; |
| 411 | if (entry->rule.listnr != AUDIT_FILTER_EXIT) |
| 412 | return -EINVAL; |
| 413 | break; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 414 | }; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 415 | return 0; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 416 | } |
| 417 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 418 | /* Translate struct audit_rule_data to kernel's rule representation. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 419 | static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, |
| 420 | size_t datasz) |
| 421 | { |
| 422 | int err = 0; |
| 423 | struct audit_entry *entry; |
| 424 | void *bufp; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 425 | size_t remain = datasz - sizeof(struct audit_rule_data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 426 | int i; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 427 | char *str; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 428 | struct audit_fsnotify_mark *audit_mark; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 429 | |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 430 | entry = audit_to_entry_common(data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 431 | if (IS_ERR(entry)) |
| 432 | goto exit_nofree; |
| 433 | |
| 434 | bufp = data->buf; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 435 | for (i = 0; i < data->field_count; i++) { |
| 436 | struct audit_field *f = &entry->rule.fields[i]; |
| 437 | |
| 438 | err = -EINVAL; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 439 | |
| 440 | f->op = audit_to_op(data->fieldflags[i]); |
| 441 | if (f->op == Audit_bad) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 442 | goto exit_free; |
| 443 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 444 | f->type = data->fields[i]; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 445 | f->val = data->values[i]; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 446 | |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 447 | /* Support legacy tests for a valid loginuid */ |
Richard Guy Briggs | 42f7446 | 2013-05-20 15:08:18 -0400 | [diff] [blame] | 448 | if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 449 | f->type = AUDIT_LOGINUID_SET; |
| 450 | f->val = 0; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 451 | entry->rule.pflags |= AUDIT_LOGINUID_LEGACY; |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 452 | } |
| 453 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 454 | err = audit_field_valid(entry, f); |
| 455 | if (err) |
| 456 | goto exit_free; |
| 457 | |
| 458 | err = -EINVAL; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 459 | switch (f->type) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 460 | case AUDIT_LOGINUID: |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 461 | case AUDIT_UID: |
| 462 | case AUDIT_EUID: |
| 463 | case AUDIT_SUID: |
| 464 | case AUDIT_FSUID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 465 | case AUDIT_OBJ_UID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 466 | f->uid = make_kuid(current_user_ns(), f->val); |
| 467 | if (!uid_valid(f->uid)) |
| 468 | goto exit_free; |
| 469 | break; |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 470 | case AUDIT_GID: |
| 471 | case AUDIT_EGID: |
| 472 | case AUDIT_SGID: |
| 473 | case AUDIT_FSGID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 474 | case AUDIT_OBJ_GID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 475 | f->gid = make_kgid(current_user_ns(), f->val); |
| 476 | if (!gid_valid(f->gid)) |
| 477 | goto exit_free; |
| 478 | break; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 479 | case AUDIT_ARCH: |
| 480 | entry->rule.arch_f = f; |
| 481 | break; |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 482 | case AUDIT_SUBJ_USER: |
| 483 | case AUDIT_SUBJ_ROLE: |
| 484 | case AUDIT_SUBJ_TYPE: |
| 485 | case AUDIT_SUBJ_SEN: |
| 486 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 487 | case AUDIT_OBJ_USER: |
| 488 | case AUDIT_OBJ_ROLE: |
| 489 | case AUDIT_OBJ_TYPE: |
| 490 | case AUDIT_OBJ_LEV_LOW: |
| 491 | case AUDIT_OBJ_LEV_HIGH: |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 492 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 493 | if (IS_ERR(str)) |
| 494 | goto exit_free; |
| 495 | entry->rule.buflen += f->val; |
| 496 | |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 497 | err = security_audit_rule_init(f->type, f->op, str, |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 498 | (void **)&f->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 499 | /* Keep currently invalid fields around in case they |
| 500 | * become valid after a policy reload. */ |
| 501 | if (err == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 502 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 503 | str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 504 | err = 0; |
| 505 | } |
| 506 | if (err) { |
| 507 | kfree(str); |
| 508 | goto exit_free; |
| 509 | } else |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 510 | f->lsm_str = str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 511 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 512 | case AUDIT_WATCH: |
| 513 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 514 | if (IS_ERR(str)) |
| 515 | goto exit_free; |
| 516 | entry->rule.buflen += f->val; |
| 517 | |
| 518 | err = audit_to_watch(&entry->rule, str, f->val, f->op); |
| 519 | if (err) { |
| 520 | kfree(str); |
| 521 | goto exit_free; |
| 522 | } |
| 523 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 524 | case AUDIT_DIR: |
| 525 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 526 | if (IS_ERR(str)) |
| 527 | goto exit_free; |
| 528 | entry->rule.buflen += f->val; |
| 529 | |
| 530 | err = audit_make_tree(&entry->rule, str, f->op); |
| 531 | kfree(str); |
| 532 | if (err) |
| 533 | goto exit_free; |
| 534 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 535 | case AUDIT_INODE: |
| 536 | err = audit_to_inode(&entry->rule, f); |
| 537 | if (err) |
| 538 | goto exit_free; |
| 539 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 540 | case AUDIT_FILTERKEY: |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 541 | if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN) |
| 542 | goto exit_free; |
| 543 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 544 | if (IS_ERR(str)) |
| 545 | goto exit_free; |
| 546 | entry->rule.buflen += f->val; |
| 547 | entry->rule.filterkey = str; |
| 548 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 549 | case AUDIT_EXE: |
| 550 | if (entry->rule.exe || f->val > PATH_MAX) |
| 551 | goto exit_free; |
| 552 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 553 | if (IS_ERR(str)) { |
| 554 | err = PTR_ERR(str); |
| 555 | goto exit_free; |
| 556 | } |
| 557 | entry->rule.buflen += f->val; |
| 558 | |
| 559 | audit_mark = audit_alloc_mark(&entry->rule, str, f->val); |
| 560 | if (IS_ERR(audit_mark)) { |
| 561 | kfree(str); |
| 562 | err = PTR_ERR(audit_mark); |
| 563 | goto exit_free; |
| 564 | } |
| 565 | entry->rule.exe = audit_mark; |
| 566 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 567 | } |
| 568 | } |
| 569 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 570 | if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal) |
| 571 | entry->rule.inode_f = NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 572 | |
| 573 | exit_nofree: |
| 574 | return entry; |
| 575 | |
| 576 | exit_free: |
Chen Gang | 373e0f3 | 2013-04-29 15:05:18 -0700 | [diff] [blame] | 577 | if (entry->rule.tree) |
| 578 | audit_put_tree(entry->rule.tree); /* that's the temporary one */ |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 579 | if (entry->rule.exe) |
| 580 | audit_remove_mark(entry->rule.exe); /* that's the template one */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 581 | audit_free_rule(entry); |
| 582 | return ERR_PTR(err); |
| 583 | } |
| 584 | |
| 585 | /* Pack a filter field's string representation into data block. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 586 | static inline size_t audit_pack_string(void **bufp, const char *str) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 587 | { |
| 588 | size_t len = strlen(str); |
| 589 | |
| 590 | memcpy(*bufp, str, len); |
| 591 | *bufp += len; |
| 592 | |
| 593 | return len; |
| 594 | } |
| 595 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 596 | /* Translate kernel rule representation to struct audit_rule_data. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 597 | static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) |
| 598 | { |
| 599 | struct audit_rule_data *data; |
| 600 | void *bufp; |
| 601 | int i; |
| 602 | |
| 603 | data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL); |
| 604 | if (unlikely(!data)) |
Amy Griffis | 0a3b483 | 2006-05-02 15:06:01 -0400 | [diff] [blame] | 605 | return NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 606 | memset(data, 0, sizeof(*data)); |
| 607 | |
| 608 | data->flags = krule->flags | krule->listnr; |
| 609 | data->action = krule->action; |
| 610 | data->field_count = krule->field_count; |
| 611 | bufp = data->buf; |
| 612 | for (i = 0; i < data->field_count; i++) { |
| 613 | struct audit_field *f = &krule->fields[i]; |
| 614 | |
| 615 | data->fields[i] = f->type; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 616 | data->fieldflags[i] = audit_ops[f->op]; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 617 | switch(f->type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 618 | case AUDIT_SUBJ_USER: |
| 619 | case AUDIT_SUBJ_ROLE: |
| 620 | case AUDIT_SUBJ_TYPE: |
| 621 | case AUDIT_SUBJ_SEN: |
| 622 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 623 | case AUDIT_OBJ_USER: |
| 624 | case AUDIT_OBJ_ROLE: |
| 625 | case AUDIT_OBJ_TYPE: |
| 626 | case AUDIT_OBJ_LEV_LOW: |
| 627 | case AUDIT_OBJ_LEV_HIGH: |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 628 | data->buflen += data->values[i] = |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 629 | audit_pack_string(&bufp, f->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 630 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 631 | case AUDIT_WATCH: |
| 632 | data->buflen += data->values[i] = |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 633 | audit_pack_string(&bufp, |
| 634 | audit_watch_path(krule->watch)); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 635 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 636 | case AUDIT_DIR: |
| 637 | data->buflen += data->values[i] = |
| 638 | audit_pack_string(&bufp, |
| 639 | audit_tree_path(krule->tree)); |
| 640 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 641 | case AUDIT_FILTERKEY: |
| 642 | data->buflen += data->values[i] = |
| 643 | audit_pack_string(&bufp, krule->filterkey); |
| 644 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 645 | case AUDIT_EXE: |
| 646 | data->buflen += data->values[i] = |
| 647 | audit_pack_string(&bufp, audit_mark_path(krule->exe)); |
| 648 | break; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 649 | case AUDIT_LOGINUID_SET: |
| 650 | if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { |
| 651 | data->fields[i] = AUDIT_LOGINUID; |
| 652 | data->values[i] = AUDIT_UID_UNSET; |
| 653 | break; |
| 654 | } |
| 655 | /* fallthrough if set */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 656 | default: |
| 657 | data->values[i] = f->val; |
| 658 | } |
| 659 | } |
| 660 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i]; |
| 661 | |
| 662 | return data; |
| 663 | } |
| 664 | |
| 665 | /* Compare two rules in kernel format. Considered success if rules |
| 666 | * don't match. */ |
| 667 | static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 668 | { |
| 669 | int i; |
| 670 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 671 | if (a->flags != b->flags || |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 672 | a->pflags != b->pflags || |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 673 | a->listnr != b->listnr || |
| 674 | a->action != b->action || |
| 675 | a->field_count != b->field_count) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 676 | return 1; |
| 677 | |
| 678 | for (i = 0; i < a->field_count; i++) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 679 | if (a->fields[i].type != b->fields[i].type || |
| 680 | a->fields[i].op != b->fields[i].op) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 681 | return 1; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 682 | |
| 683 | switch(a->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 684 | case AUDIT_SUBJ_USER: |
| 685 | case AUDIT_SUBJ_ROLE: |
| 686 | case AUDIT_SUBJ_TYPE: |
| 687 | case AUDIT_SUBJ_SEN: |
| 688 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 689 | case AUDIT_OBJ_USER: |
| 690 | case AUDIT_OBJ_ROLE: |
| 691 | case AUDIT_OBJ_TYPE: |
| 692 | case AUDIT_OBJ_LEV_LOW: |
| 693 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 694 | if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 695 | return 1; |
| 696 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 697 | case AUDIT_WATCH: |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 698 | if (strcmp(audit_watch_path(a->watch), |
| 699 | audit_watch_path(b->watch))) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 700 | return 1; |
| 701 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 702 | case AUDIT_DIR: |
| 703 | if (strcmp(audit_tree_path(a->tree), |
| 704 | audit_tree_path(b->tree))) |
| 705 | return 1; |
| 706 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 707 | case AUDIT_FILTERKEY: |
| 708 | /* both filterkeys exist based on above type compare */ |
| 709 | if (strcmp(a->filterkey, b->filterkey)) |
| 710 | return 1; |
| 711 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 712 | case AUDIT_EXE: |
| 713 | /* both paths exist based on above type compare */ |
| 714 | if (strcmp(audit_mark_path(a->exe), |
| 715 | audit_mark_path(b->exe))) |
| 716 | return 1; |
| 717 | break; |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 718 | case AUDIT_UID: |
| 719 | case AUDIT_EUID: |
| 720 | case AUDIT_SUID: |
| 721 | case AUDIT_FSUID: |
| 722 | case AUDIT_LOGINUID: |
| 723 | case AUDIT_OBJ_UID: |
| 724 | if (!uid_eq(a->fields[i].uid, b->fields[i].uid)) |
| 725 | return 1; |
| 726 | break; |
| 727 | case AUDIT_GID: |
| 728 | case AUDIT_EGID: |
| 729 | case AUDIT_SGID: |
| 730 | case AUDIT_FSGID: |
| 731 | case AUDIT_OBJ_GID: |
| 732 | if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) |
| 733 | return 1; |
| 734 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 735 | default: |
| 736 | if (a->fields[i].val != b->fields[i].val) |
| 737 | return 1; |
| 738 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 742 | if (a->mask[i] != b->mask[i]) |
| 743 | return 1; |
| 744 | |
| 745 | return 0; |
| 746 | } |
| 747 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 748 | /* Duplicate LSM field information. The lsm_rule is opaque, so must be |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 749 | * re-initialized. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 750 | static inline int audit_dupe_lsm_field(struct audit_field *df, |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 751 | struct audit_field *sf) |
| 752 | { |
| 753 | int ret = 0; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 754 | char *lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 755 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 756 | /* our own copy of lsm_str */ |
| 757 | lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); |
| 758 | if (unlikely(!lsm_str)) |
Akinobu Mita | 3e1fbd1 | 2006-12-22 01:10:02 -0800 | [diff] [blame] | 759 | return -ENOMEM; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 760 | df->lsm_str = lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 761 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 762 | /* our own (refreshed) copy of lsm_rule */ |
| 763 | ret = security_audit_rule_init(df->type, df->op, df->lsm_str, |
| 764 | (void **)&df->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 765 | /* Keep currently invalid fields around in case they |
| 766 | * become valid after a policy reload. */ |
| 767 | if (ret == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 768 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 769 | df->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 770 | ret = 0; |
| 771 | } |
| 772 | |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | /* Duplicate an audit rule. This will be a deep copy with the exception |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 777 | * of the watch - that pointer is carried over. The LSM specific fields |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 778 | * will be updated in the copy. The point is to be able to replace the old |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 779 | * rule with the new rule in the filterlist, then free the old rule. |
| 780 | * The rlist element is undefined; list manipulations are handled apart from |
| 781 | * the initial copy. */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 782 | struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 783 | { |
| 784 | u32 fcount = old->field_count; |
| 785 | struct audit_entry *entry; |
| 786 | struct audit_krule *new; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 787 | char *fk; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 788 | int i, err = 0; |
| 789 | |
| 790 | entry = audit_init_entry(fcount); |
| 791 | if (unlikely(!entry)) |
| 792 | return ERR_PTR(-ENOMEM); |
| 793 | |
| 794 | new = &entry->rule; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 795 | new->flags = old->flags; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 796 | new->pflags = old->pflags; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 797 | new->listnr = old->listnr; |
| 798 | new->action = old->action; |
| 799 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 800 | new->mask[i] = old->mask[i]; |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 801 | new->prio = old->prio; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 802 | new->buflen = old->buflen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 803 | new->inode_f = old->inode_f; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 804 | new->field_count = old->field_count; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 805 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 806 | /* |
| 807 | * note that we are OK with not refcounting here; audit_match_tree() |
| 808 | * never dereferences tree and we can't get false positives there |
| 809 | * since we'd have to have rule gone from the list *and* removed |
| 810 | * before the chunks found by lookup had been allocated, i.e. before |
| 811 | * the beginning of list scan. |
| 812 | */ |
| 813 | new->tree = old->tree; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 814 | memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
| 815 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 816 | /* deep copy this information, updating the lsm_rule fields, because |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 817 | * the originals will all be freed when the old rule is freed. */ |
| 818 | for (i = 0; i < fcount; i++) { |
| 819 | switch (new->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 820 | case AUDIT_SUBJ_USER: |
| 821 | case AUDIT_SUBJ_ROLE: |
| 822 | case AUDIT_SUBJ_TYPE: |
| 823 | case AUDIT_SUBJ_SEN: |
| 824 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 825 | case AUDIT_OBJ_USER: |
| 826 | case AUDIT_OBJ_ROLE: |
| 827 | case AUDIT_OBJ_TYPE: |
| 828 | case AUDIT_OBJ_LEV_LOW: |
| 829 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 830 | err = audit_dupe_lsm_field(&new->fields[i], |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 831 | &old->fields[i]); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 832 | break; |
| 833 | case AUDIT_FILTERKEY: |
| 834 | fk = kstrdup(old->filterkey, GFP_KERNEL); |
| 835 | if (unlikely(!fk)) |
| 836 | err = -ENOMEM; |
| 837 | else |
| 838 | new->filterkey = fk; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 839 | break; |
| 840 | case AUDIT_EXE: |
| 841 | err = audit_dupe_exe(new, old); |
| 842 | break; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 843 | } |
| 844 | if (err) { |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 845 | if (new->exe) |
| 846 | audit_remove_mark(new->exe); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 847 | audit_free_rule(entry); |
| 848 | return ERR_PTR(err); |
| 849 | } |
| 850 | } |
| 851 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 852 | if (old->watch) { |
| 853 | audit_get_watch(old->watch); |
| 854 | new->watch = old->watch; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 855 | } |
| 856 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 857 | return entry; |
| 858 | } |
| 859 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 860 | /* Find an existing audit rule. |
| 861 | * Caller must hold audit_filter_mutex to prevent stale rule data. */ |
| 862 | static struct audit_entry *audit_find_rule(struct audit_entry *entry, |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 863 | struct list_head **p) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 864 | { |
| 865 | struct audit_entry *e, *found = NULL; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 866 | struct list_head *list; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 867 | int h; |
| 868 | |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 869 | if (entry->rule.inode_f) { |
| 870 | h = audit_hash_ino(entry->rule.inode_f->val); |
| 871 | *p = list = &audit_inode_hash[h]; |
| 872 | } else if (entry->rule.watch) { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 873 | /* we don't know the inode number, so must walk entire hash */ |
| 874 | for (h = 0; h < AUDIT_INODE_BUCKETS; h++) { |
| 875 | list = &audit_inode_hash[h]; |
| 876 | list_for_each_entry(e, list, list) |
| 877 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 878 | found = e; |
| 879 | goto out; |
| 880 | } |
| 881 | } |
| 882 | goto out; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 883 | } else { |
| 884 | *p = list = &audit_filter_list[entry->rule.listnr]; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | list_for_each_entry(e, list, list) |
| 888 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 889 | found = e; |
| 890 | goto out; |
| 891 | } |
| 892 | |
| 893 | out: |
| 894 | return found; |
| 895 | } |
| 896 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 897 | static u64 prio_low = ~0ULL/2; |
| 898 | static u64 prio_high = ~0ULL/2 - 1; |
| 899 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 900 | /* Add rule to given filterlist if not a duplicate. */ |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 901 | static inline int audit_add_rule(struct audit_entry *entry) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 902 | { |
| 903 | struct audit_entry *e; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 904 | struct audit_watch *watch = entry->rule.watch; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 905 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 906 | struct list_head *list; |
Paul Moore | ae9d2fb | 2015-08-05 11:19:45 -0400 | [diff] [blame] | 907 | int err = 0; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 908 | #ifdef CONFIG_AUDITSYSCALL |
| 909 | int dont_count = 0; |
| 910 | |
| 911 | /* If either of these, don't count towards total */ |
| 912 | if (entry->rule.listnr == AUDIT_FILTER_USER || |
| 913 | entry->rule.listnr == AUDIT_FILTER_TYPE) |
| 914 | dont_count = 1; |
| 915 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 916 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 917 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 918 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 919 | if (e) { |
Eric Paris | 35fe4d0 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 920 | mutex_unlock(&audit_filter_mutex); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 921 | err = -EEXIST; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 922 | /* normally audit_add_tree_rule() will free it on failure */ |
| 923 | if (tree) |
| 924 | audit_put_tree(tree); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 925 | return err; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 926 | } |
| 927 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 928 | if (watch) { |
| 929 | /* audit_filter_mutex is dropped and re-taken during this call */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 930 | err = audit_add_watch(&entry->rule, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 931 | if (err) { |
| 932 | mutex_unlock(&audit_filter_mutex); |
Chen Gang | 2f992ee | 2013-07-08 15:59:38 -0700 | [diff] [blame] | 933 | /* |
| 934 | * normally audit_add_tree_rule() will free it |
| 935 | * on failure |
| 936 | */ |
| 937 | if (tree) |
| 938 | audit_put_tree(tree); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 939 | return err; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 940 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 941 | } |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 942 | if (tree) { |
| 943 | err = audit_add_tree_rule(&entry->rule); |
| 944 | if (err) { |
| 945 | mutex_unlock(&audit_filter_mutex); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 946 | return err; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 947 | } |
| 948 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 949 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 950 | entry->rule.prio = ~0ULL; |
| 951 | if (entry->rule.listnr == AUDIT_FILTER_EXIT) { |
| 952 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) |
| 953 | entry->rule.prio = ++prio_high; |
| 954 | else |
| 955 | entry->rule.prio = --prio_low; |
| 956 | } |
| 957 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 958 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 959 | list_add(&entry->rule.list, |
| 960 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 961 | list_add_rcu(&entry->list, list); |
Amy Griffis | 6a2bcee | 2006-06-02 13:16:01 -0400 | [diff] [blame] | 962 | entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 963 | } else { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 964 | list_add_tail(&entry->rule.list, |
| 965 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 966 | list_add_tail_rcu(&entry->list, list); |
| 967 | } |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 968 | #ifdef CONFIG_AUDITSYSCALL |
| 969 | if (!dont_count) |
| 970 | audit_n_rules++; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 971 | |
| 972 | if (!audit_match_signal(entry)) |
| 973 | audit_signals++; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 974 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 975 | mutex_unlock(&audit_filter_mutex); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 976 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 977 | return err; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 978 | } |
| 979 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 980 | /* Remove an existing rule from filterlist. */ |
Richard Guy Briggs | 7f49294 | 2015-08-05 16:29:36 -0400 | [diff] [blame] | 981 | int audit_del_rule(struct audit_entry *entry) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 982 | { |
| 983 | struct audit_entry *e; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 984 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 985 | struct list_head *list; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 986 | int ret = 0; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 987 | #ifdef CONFIG_AUDITSYSCALL |
| 988 | int dont_count = 0; |
| 989 | |
| 990 | /* If either of these, don't count towards total */ |
| 991 | if (entry->rule.listnr == AUDIT_FILTER_USER || |
| 992 | entry->rule.listnr == AUDIT_FILTER_TYPE) |
| 993 | dont_count = 1; |
| 994 | #endif |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 995 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 996 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 997 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 998 | if (!e) { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 999 | ret = -ENOENT; |
| 1000 | goto out; |
| 1001 | } |
| 1002 | |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 1003 | if (e->rule.watch) |
Eric Paris | a05fb6c | 2009-12-17 20:12:05 -0500 | [diff] [blame] | 1004 | audit_remove_watch_rule(&e->rule); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1005 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1006 | if (e->rule.tree) |
| 1007 | audit_remove_tree_rule(&e->rule); |
| 1008 | |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1009 | if (e->rule.exe) |
| 1010 | audit_remove_mark_rule(&e->rule); |
| 1011 | |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1012 | #ifdef CONFIG_AUDITSYSCALL |
| 1013 | if (!dont_count) |
| 1014 | audit_n_rules--; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 1015 | |
| 1016 | if (!audit_match_signal(entry)) |
| 1017 | audit_signals--; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1018 | #endif |
Richard Guy Briggs | 8c85fc9 | 2015-08-05 15:23:09 -0400 | [diff] [blame] | 1019 | |
| 1020 | list_del_rcu(&e->list); |
| 1021 | list_del(&e->rule.list); |
| 1022 | call_rcu(&e->rcu, audit_free_rule_rcu); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1023 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1024 | out: |
Richard Guy Briggs | 8c85fc9 | 2015-08-05 15:23:09 -0400 | [diff] [blame] | 1025 | mutex_unlock(&audit_filter_mutex); |
| 1026 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1027 | if (tree) |
| 1028 | audit_put_tree(tree); /* that's the temporary one */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1029 | |
| 1030 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1031 | } |
| 1032 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1033 | /* List rules using struct audit_rule_data. */ |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1034 | static void audit_list_rules(__u32 portid, int seq, struct sk_buff_head *q) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1035 | { |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1036 | struct sk_buff *skb; |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1037 | struct audit_krule *r; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1038 | int i; |
| 1039 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1040 | /* This is a blocking read, so use audit_filter_mutex instead of rcu |
| 1041 | * iterator to sync with list writers. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1042 | for (i=0; i<AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1043 | list_for_each_entry(r, &audit_rules_list[i], list) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1044 | struct audit_rule_data *data; |
| 1045 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1046 | data = audit_krule_to_data(r); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1047 | if (unlikely(!data)) |
| 1048 | break; |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1049 | skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, |
| 1050 | 0, 1, data, |
| 1051 | sizeof(*data) + data->buflen); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1052 | if (skb) |
| 1053 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1054 | kfree(data); |
| 1055 | } |
| 1056 | } |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1057 | skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, 1, 1, NULL, 0); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1058 | if (skb) |
| 1059 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1060 | } |
| 1061 | |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1062 | /* Log rule additions and removals */ |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1063 | static void audit_log_rule_change(char *action, struct audit_krule *rule, int res) |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1064 | { |
| 1065 | struct audit_buffer *ab; |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1066 | uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
Eric Paris | 4440e85 | 2013-11-27 17:35:17 -0500 | [diff] [blame] | 1067 | unsigned int sessionid = audit_get_sessionid(current); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1068 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 1069 | if (!audit_enabled) |
| 1070 | return; |
| 1071 | |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1072 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
| 1073 | if (!ab) |
| 1074 | return; |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1075 | audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 1076 | audit_log_task_context(ab); |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1077 | audit_log_format(ab, " op="); |
| 1078 | audit_log_string(ab, action); |
| 1079 | audit_log_key(ab, rule->filterkey); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1080 | audit_log_format(ab, " list=%d res=%d", rule->listnr, res); |
| 1081 | audit_log_end(ab); |
| 1082 | } |
| 1083 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1084 | /** |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1085 | * audit_rule_change - apply all rules to the specified message type |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1086 | * @type: audit message type |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1087 | * @portid: target port id for netlink audit messages |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1088 | * @seq: netlink audit message sequence (serial) number |
| 1089 | * @data: payload data |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1090 | * @datasz: size of payload data |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1091 | */ |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1092 | int audit_rule_change(int type, __u32 portid, int seq, void *data, |
| 1093 | size_t datasz) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1094 | { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1095 | int err = 0; |
| 1096 | struct audit_entry *entry; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1097 | |
Richard Guy Briggs | e85322d | 2014-10-02 22:05:19 -0400 | [diff] [blame] | 1098 | entry = audit_data_to_entry(data, datasz); |
| 1099 | if (IS_ERR(entry)) |
| 1100 | return PTR_ERR(entry); |
| 1101 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1102 | switch (type) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1103 | case AUDIT_ADD_RULE: |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1104 | err = audit_add_rule(entry); |
Burn Alting | e7df61f | 2014-04-04 16:00:38 +1100 | [diff] [blame] | 1105 | audit_log_rule_change("add_rule", &entry->rule, !err); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1106 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1107 | case AUDIT_DEL_RULE: |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1108 | err = audit_del_rule(entry); |
Burn Alting | e7df61f | 2014-04-04 16:00:38 +1100 | [diff] [blame] | 1109 | audit_log_rule_change("remove_rule", &entry->rule, !err); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1110 | break; |
| 1111 | default: |
Eric Paris | 739c950 | 2014-10-10 15:05:21 -0400 | [diff] [blame] | 1112 | err = -EINVAL; |
| 1113 | WARN_ON(1); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1114 | } |
| 1115 | |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1116 | if (err || type == AUDIT_DEL_RULE) { |
| 1117 | if (entry->rule.exe) |
| 1118 | audit_remove_mark(entry->rule.exe); |
Richard Guy Briggs | e85322d | 2014-10-02 22:05:19 -0400 | [diff] [blame] | 1119 | audit_free_rule(entry); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1120 | } |
Richard Guy Briggs | e85322d | 2014-10-02 22:05:19 -0400 | [diff] [blame] | 1121 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1122 | return err; |
| 1123 | } |
| 1124 | |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1125 | /** |
| 1126 | * audit_list_rules_send - list the audit rules |
Eric W. Biederman | d211f177 | 2014-03-08 15:31:54 -0800 | [diff] [blame] | 1127 | * @request_skb: skb of request we are replying to (used to target the reply) |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1128 | * @seq: netlink audit message sequence (serial) number |
| 1129 | */ |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1130 | int audit_list_rules_send(struct sk_buff *request_skb, int seq) |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1131 | { |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1132 | u32 portid = NETLINK_CB(request_skb).portid; |
| 1133 | struct net *net = sock_net(NETLINK_CB(request_skb).sk); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1134 | struct task_struct *tsk; |
| 1135 | struct audit_netlink_list *dest; |
| 1136 | int err = 0; |
| 1137 | |
| 1138 | /* We can't just spew out the rules here because we might fill |
| 1139 | * the available socket buffer space and deadlock waiting for |
| 1140 | * auditctl to read from it... which isn't ever going to |
| 1141 | * happen if we're actually running in the context of auditctl |
| 1142 | * trying to _send_ the stuff */ |
| 1143 | |
| 1144 | dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); |
| 1145 | if (!dest) |
| 1146 | return -ENOMEM; |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1147 | dest->net = get_net(net); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1148 | dest->portid = portid; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1149 | skb_queue_head_init(&dest->q); |
| 1150 | |
| 1151 | mutex_lock(&audit_filter_mutex); |
| 1152 | audit_list_rules(portid, seq, &dest->q); |
| 1153 | mutex_unlock(&audit_filter_mutex); |
| 1154 | |
| 1155 | tsk = kthread_run(audit_send_list, dest, "audit_send_list"); |
| 1156 | if (IS_ERR(tsk)) { |
| 1157 | skb_queue_purge(&dest->q); |
| 1158 | kfree(dest); |
| 1159 | err = PTR_ERR(tsk); |
| 1160 | } |
| 1161 | |
| 1162 | return err; |
| 1163 | } |
| 1164 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1165 | int audit_comparator(u32 left, u32 op, u32 right) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1166 | { |
| 1167 | switch (op) { |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1168 | case Audit_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1169 | return (left == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1170 | case Audit_not_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1171 | return (left != right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1172 | case Audit_lt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1173 | return (left < right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1174 | case Audit_le: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1175 | return (left <= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1176 | case Audit_gt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1177 | return (left > right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1178 | case Audit_ge: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1179 | return (left >= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1180 | case Audit_bitmask: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1181 | return (left & right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1182 | case Audit_bittest: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1183 | return ((left & right) == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1184 | default: |
| 1185 | BUG(); |
| 1186 | return 0; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1187 | } |
| 1188 | } |
| 1189 | |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1190 | int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) |
| 1191 | { |
| 1192 | switch (op) { |
| 1193 | case Audit_equal: |
| 1194 | return uid_eq(left, right); |
| 1195 | case Audit_not_equal: |
| 1196 | return !uid_eq(left, right); |
| 1197 | case Audit_lt: |
| 1198 | return uid_lt(left, right); |
| 1199 | case Audit_le: |
| 1200 | return uid_lte(left, right); |
| 1201 | case Audit_gt: |
| 1202 | return uid_gt(left, right); |
| 1203 | case Audit_ge: |
| 1204 | return uid_gte(left, right); |
| 1205 | case Audit_bitmask: |
| 1206 | case Audit_bittest: |
| 1207 | default: |
| 1208 | BUG(); |
| 1209 | return 0; |
| 1210 | } |
| 1211 | } |
| 1212 | |
| 1213 | int audit_gid_comparator(kgid_t left, u32 op, kgid_t right) |
| 1214 | { |
| 1215 | switch (op) { |
| 1216 | case Audit_equal: |
| 1217 | return gid_eq(left, right); |
| 1218 | case Audit_not_equal: |
| 1219 | return !gid_eq(left, right); |
| 1220 | case Audit_lt: |
| 1221 | return gid_lt(left, right); |
| 1222 | case Audit_le: |
| 1223 | return gid_lte(left, right); |
| 1224 | case Audit_gt: |
| 1225 | return gid_gt(left, right); |
| 1226 | case Audit_ge: |
| 1227 | return gid_gte(left, right); |
| 1228 | case Audit_bitmask: |
| 1229 | case Audit_bittest: |
| 1230 | default: |
| 1231 | BUG(); |
| 1232 | return 0; |
| 1233 | } |
| 1234 | } |
| 1235 | |
Jeff Layton | bfcec70 | 2012-10-10 15:25:23 -0400 | [diff] [blame] | 1236 | /** |
| 1237 | * parent_len - find the length of the parent portion of a pathname |
| 1238 | * @path: pathname of which to determine length |
| 1239 | */ |
| 1240 | int parent_len(const char *path) |
| 1241 | { |
| 1242 | int plen; |
| 1243 | const char *p; |
| 1244 | |
| 1245 | plen = strlen(path); |
| 1246 | |
| 1247 | if (plen == 0) |
| 1248 | return plen; |
| 1249 | |
| 1250 | /* disregard trailing slashes */ |
| 1251 | p = path + plen - 1; |
| 1252 | while ((*p == '/') && (p > path)) |
| 1253 | p--; |
| 1254 | |
| 1255 | /* walk backward until we find the next slash or hit beginning */ |
| 1256 | while ((*p != '/') && (p > path)) |
| 1257 | p--; |
| 1258 | |
| 1259 | /* did we find a slash? Then increment to include it in path */ |
| 1260 | if (*p == '/') |
| 1261 | p++; |
| 1262 | |
| 1263 | return p - path; |
| 1264 | } |
| 1265 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1266 | /** |
| 1267 | * audit_compare_dname_path - compare given dentry name with last component in |
| 1268 | * given path. Return of 0 indicates a match. |
| 1269 | * @dname: dentry name that we're comparing |
| 1270 | * @path: full pathname that we're comparing |
| 1271 | * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL |
| 1272 | * here indicates that we must compute this value. |
| 1273 | */ |
| 1274 | int audit_compare_dname_path(const char *dname, const char *path, int parentlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1275 | { |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1276 | int dlen, pathlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1277 | const char *p; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1278 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1279 | dlen = strlen(dname); |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1280 | pathlen = strlen(path); |
| 1281 | if (pathlen < dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1282 | return 1; |
| 1283 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1284 | parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1285 | if (pathlen - parentlen != dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1286 | return 1; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1287 | |
| 1288 | p = path + parentlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1289 | |
| 1290 | return strncmp(p, dname, dlen); |
| 1291 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1292 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1293 | static int audit_filter_user_rules(struct audit_krule *rule, int type, |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1294 | enum audit_state *state) |
| 1295 | { |
| 1296 | int i; |
| 1297 | |
| 1298 | for (i = 0; i < rule->field_count; i++) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1299 | struct audit_field *f = &rule->fields[i]; |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 1300 | pid_t pid; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1301 | int result = 0; |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1302 | u32 sid; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1303 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1304 | switch (f->type) { |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1305 | case AUDIT_PID: |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 1306 | pid = task_pid_nr(current); |
| 1307 | result = audit_comparator(pid, f->op, f->val); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1308 | break; |
| 1309 | case AUDIT_UID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1310 | result = audit_uid_comparator(current_uid(), f->op, f->uid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1311 | break; |
| 1312 | case AUDIT_GID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1313 | result = audit_gid_comparator(current_gid(), f->op, f->gid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1314 | break; |
| 1315 | case AUDIT_LOGINUID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1316 | result = audit_uid_comparator(audit_get_loginuid(current), |
| 1317 | f->op, f->uid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1318 | break; |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 1319 | case AUDIT_LOGINUID_SET: |
| 1320 | result = audit_comparator(audit_loginuid_set(current), |
| 1321 | f->op, f->val); |
| 1322 | break; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1323 | case AUDIT_MSGTYPE: |
| 1324 | result = audit_comparator(type, f->op, f->val); |
| 1325 | break; |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1326 | case AUDIT_SUBJ_USER: |
| 1327 | case AUDIT_SUBJ_ROLE: |
| 1328 | case AUDIT_SUBJ_TYPE: |
| 1329 | case AUDIT_SUBJ_SEN: |
| 1330 | case AUDIT_SUBJ_CLR: |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1331 | if (f->lsm_rule) { |
| 1332 | security_task_getsecid(current, &sid); |
| 1333 | result = security_audit_rule_match(sid, |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1334 | f->type, |
| 1335 | f->op, |
| 1336 | f->lsm_rule, |
| 1337 | NULL); |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1338 | } |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1339 | break; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | if (!result) |
| 1343 | return 0; |
| 1344 | } |
| 1345 | switch (rule->action) { |
| 1346 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1347 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
| 1348 | } |
| 1349 | return 1; |
| 1350 | } |
| 1351 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1352 | int audit_filter_user(int type) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1353 | { |
Ingo Molnar | 11f57ce | 2007-02-10 01:46:09 -0800 | [diff] [blame] | 1354 | enum audit_state state = AUDIT_DISABLED; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1355 | struct audit_entry *e; |
Richard Guy Briggs | 724e4fcc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 1356 | int rc, ret; |
| 1357 | |
| 1358 | ret = 1; /* Audit by default */ |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1359 | |
| 1360 | rcu_read_lock(); |
| 1361 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { |
Richard Guy Briggs | 724e4fcc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 1362 | rc = audit_filter_user_rules(&e->rule, type, &state); |
| 1363 | if (rc) { |
| 1364 | if (rc > 0 && state == AUDIT_DISABLED) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1365 | ret = 0; |
| 1366 | break; |
| 1367 | } |
| 1368 | } |
| 1369 | rcu_read_unlock(); |
| 1370 | |
Richard Guy Briggs | 724e4fcc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 1371 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1372 | } |
| 1373 | |
| 1374 | int audit_filter_type(int type) |
| 1375 | { |
| 1376 | struct audit_entry *e; |
| 1377 | int result = 0; |
Daniel Walker | 9ce3421 | 2007-10-18 03:06:06 -0700 | [diff] [blame] | 1378 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1379 | rcu_read_lock(); |
| 1380 | if (list_empty(&audit_filter_list[AUDIT_FILTER_TYPE])) |
| 1381 | goto unlock_and_return; |
| 1382 | |
| 1383 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TYPE], |
| 1384 | list) { |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1385 | int i; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1386 | for (i = 0; i < e->rule.field_count; i++) { |
| 1387 | struct audit_field *f = &e->rule.fields[i]; |
| 1388 | if (f->type == AUDIT_MSGTYPE) { |
| 1389 | result = audit_comparator(type, f->op, f->val); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1390 | if (!result) |
| 1391 | break; |
| 1392 | } |
| 1393 | } |
| 1394 | if (result) |
| 1395 | goto unlock_and_return; |
| 1396 | } |
| 1397 | unlock_and_return: |
| 1398 | rcu_read_unlock(); |
| 1399 | return result; |
| 1400 | } |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1401 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1402 | static int update_lsm_rule(struct audit_krule *r) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1403 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1404 | struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1405 | struct audit_entry *nentry; |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1406 | int err = 0; |
| 1407 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1408 | if (!security_audit_rule_known(r)) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1409 | return 0; |
| 1410 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1411 | nentry = audit_dupe_rule(r); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1412 | if (entry->rule.exe) |
| 1413 | audit_remove_mark(entry->rule.exe); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1414 | if (IS_ERR(nentry)) { |
| 1415 | /* save the first error encountered for the |
| 1416 | * return value */ |
| 1417 | err = PTR_ERR(nentry); |
| 1418 | audit_panic("error updating LSM filters"); |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1419 | if (r->watch) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1420 | list_del(&r->rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1421 | list_del_rcu(&entry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1422 | list_del(&r->list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1423 | } else { |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1424 | if (r->watch || r->tree) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1425 | list_replace_init(&r->rlist, &nentry->rule.rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1426 | list_replace_rcu(&entry->list, &nentry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1427 | list_replace(&r->list, &nentry->rule.list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1428 | } |
| 1429 | call_rcu(&entry->rcu, audit_free_rule_rcu); |
| 1430 | |
| 1431 | return err; |
| 1432 | } |
| 1433 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 1434 | /* This function will re-initialize the lsm_rule field of all applicable rules. |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 1435 | * It will traverse the filter lists serarching for rules that contain LSM |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1436 | * specific filter fields. When such a rule is found, it is copied, the |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 1437 | * LSM field is re-initialized, and the old rule is replaced with the |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1438 | * updated rule. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 1439 | int audit_update_lsm_rules(void) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1440 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1441 | struct audit_krule *r, *n; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1442 | int i, err = 0; |
| 1443 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1444 | /* audit_filter_mutex synchronizes the writers */ |
| 1445 | mutex_lock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1446 | |
| 1447 | for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1448 | list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { |
| 1449 | int res = update_lsm_rule(r); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1450 | if (!err) |
| 1451 | err = res; |
| 1452 | } |
| 1453 | } |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1454 | mutex_unlock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1455 | |
| 1456 | return err; |
| 1457 | } |