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: |
| 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 |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 45 | * LSM rules during filtering. If modified, these structures |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 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. |
| 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 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 74 | static inline void audit_free_rule(struct audit_entry *e) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 75 | { |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 76 | int i; |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 77 | struct audit_krule *erule = &e->rule; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 78 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 79 | /* some rules don't have associated watches */ |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 80 | if (erule->watch) |
| 81 | audit_put_watch(erule->watch); |
| 82 | if (erule->fields) |
| 83 | for (i = 0; i < erule->field_count; i++) { |
| 84 | struct audit_field *f = &erule->fields[i]; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 85 | kfree(f->lsm_str); |
| 86 | security_audit_rule_free(f->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 87 | } |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 88 | kfree(erule->fields); |
| 89 | kfree(erule->filterkey); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 90 | kfree(e); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 91 | } |
| 92 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 93 | void audit_free_rule_rcu(struct rcu_head *head) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 94 | { |
| 95 | struct audit_entry *e = container_of(head, struct audit_entry, rcu); |
| 96 | audit_free_rule(e); |
| 97 | } |
| 98 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 99 | /* Initialize an audit filterlist entry. */ |
| 100 | static inline struct audit_entry *audit_init_entry(u32 field_count) |
| 101 | { |
| 102 | struct audit_entry *entry; |
| 103 | struct audit_field *fields; |
| 104 | |
| 105 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 106 | if (unlikely(!entry)) |
| 107 | return NULL; |
| 108 | |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 109 | fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 110 | if (unlikely(!fields)) { |
| 111 | kfree(entry); |
| 112 | return NULL; |
| 113 | } |
| 114 | entry->rule.fields = fields; |
| 115 | |
| 116 | return entry; |
| 117 | } |
| 118 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 119 | /* Unpack a filter field's string representation from user-space |
| 120 | * buffer. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 121 | char *audit_unpack_string(void **bufp, size_t *remain, size_t len) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 122 | { |
| 123 | char *str; |
| 124 | |
| 125 | if (!*bufp || (len == 0) || (len > *remain)) |
| 126 | return ERR_PTR(-EINVAL); |
| 127 | |
| 128 | /* Of the currently implemented string fields, PATH_MAX |
| 129 | * defines the longest valid length. |
| 130 | */ |
| 131 | if (len > PATH_MAX) |
| 132 | return ERR_PTR(-ENAMETOOLONG); |
| 133 | |
| 134 | str = kmalloc(len + 1, GFP_KERNEL); |
| 135 | if (unlikely(!str)) |
| 136 | return ERR_PTR(-ENOMEM); |
| 137 | |
| 138 | memcpy(str, *bufp, len); |
| 139 | str[len] = 0; |
| 140 | *bufp += len; |
| 141 | *remain -= len; |
| 142 | |
| 143 | return str; |
| 144 | } |
| 145 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 146 | /* Translate an inode field to kernel respresentation. */ |
| 147 | static inline int audit_to_inode(struct audit_krule *krule, |
| 148 | struct audit_field *f) |
| 149 | { |
| 150 | if (krule->listnr != AUDIT_FILTER_EXIT || |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 151 | krule->watch || krule->inode_f || krule->tree || |
| 152 | (f->op != Audit_equal && f->op != Audit_not_equal)) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 153 | return -EINVAL; |
| 154 | |
| 155 | krule->inode_f = f; |
| 156 | return 0; |
| 157 | } |
| 158 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 159 | static __u32 *classes[AUDIT_SYSCALL_CLASSES]; |
| 160 | |
| 161 | int __init audit_register_class(int class, unsigned *list) |
| 162 | { |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 163 | __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL); |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 164 | if (!p) |
| 165 | return -ENOMEM; |
| 166 | while (*list != ~0U) { |
| 167 | unsigned n = *list++; |
| 168 | if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) { |
| 169 | kfree(p); |
| 170 | return -EINVAL; |
| 171 | } |
| 172 | p[AUDIT_WORD(n)] |= AUDIT_BIT(n); |
| 173 | } |
| 174 | if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) { |
| 175 | kfree(p); |
| 176 | return -EINVAL; |
| 177 | } |
| 178 | classes[class] = p; |
| 179 | return 0; |
| 180 | } |
| 181 | |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 182 | int audit_match_class(int class, unsigned syscall) |
| 183 | { |
Klaus Weidner | c926e4f | 2007-05-16 17:45:42 -0500 | [diff] [blame] | 184 | if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32)) |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 185 | return 0; |
| 186 | if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class])) |
| 187 | return 0; |
| 188 | return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall); |
| 189 | } |
| 190 | |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 191 | #ifdef CONFIG_AUDITSYSCALL |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 192 | static inline int audit_match_class_bits(int class, u32 *mask) |
| 193 | { |
| 194 | int i; |
| 195 | |
| 196 | if (classes[class]) { |
| 197 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 198 | if (mask[i] & classes[class][i]) |
| 199 | return 0; |
| 200 | } |
| 201 | return 1; |
| 202 | } |
| 203 | |
| 204 | static int audit_match_signal(struct audit_entry *entry) |
| 205 | { |
| 206 | struct audit_field *arch = entry->rule.arch_f; |
| 207 | |
| 208 | if (!arch) { |
| 209 | /* When arch is unspecified, we must check both masks on biarch |
| 210 | * as syscall number alone is ambiguous. */ |
| 211 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 212 | entry->rule.mask) && |
| 213 | audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 214 | entry->rule.mask)); |
| 215 | } |
| 216 | |
| 217 | switch(audit_classify_arch(arch->val)) { |
| 218 | case 0: /* native */ |
| 219 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 220 | entry->rule.mask)); |
| 221 | case 1: /* 32bit on biarch */ |
| 222 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 223 | entry->rule.mask)); |
| 224 | default: |
| 225 | return 1; |
| 226 | } |
| 227 | } |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 228 | #endif |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 229 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 230 | /* Common user-space to kernel rule translation. */ |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 231 | 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] | 232 | { |
| 233 | unsigned listnr; |
| 234 | struct audit_entry *entry; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 235 | int i, err; |
| 236 | |
| 237 | err = -EINVAL; |
| 238 | listnr = rule->flags & ~AUDIT_FILTER_PREPEND; |
| 239 | switch(listnr) { |
| 240 | default: |
| 241 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 242 | #ifdef CONFIG_AUDITSYSCALL |
| 243 | case AUDIT_FILTER_ENTRY: |
Eric Paris | 7ff68e5 | 2012-01-03 14:23:07 -0500 | [diff] [blame] | 244 | if (rule->action == AUDIT_ALWAYS) |
| 245 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 246 | case AUDIT_FILTER_EXIT: |
| 247 | case AUDIT_FILTER_TASK: |
| 248 | #endif |
Eric Paris | 7ff68e5 | 2012-01-03 14:23:07 -0500 | [diff] [blame] | 249 | case AUDIT_FILTER_USER: |
| 250 | case AUDIT_FILTER_TYPE: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 251 | ; |
| 252 | } |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 253 | if (unlikely(rule->action == AUDIT_POSSIBLE)) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 254 | pr_err("AUDIT_POSSIBLE is deprecated\n"); |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 255 | goto exit_err; |
| 256 | } |
| 257 | if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 258 | goto exit_err; |
| 259 | if (rule->field_count > AUDIT_MAX_FIELDS) |
| 260 | goto exit_err; |
| 261 | |
| 262 | err = -ENOMEM; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 263 | entry = audit_init_entry(rule->field_count); |
| 264 | if (!entry) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 265 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 266 | |
| 267 | entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND; |
| 268 | entry->rule.listnr = listnr; |
| 269 | entry->rule.action = rule->action; |
| 270 | entry->rule.field_count = rule->field_count; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 271 | |
| 272 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 273 | entry->rule.mask[i] = rule->mask[i]; |
| 274 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 275 | for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) { |
| 276 | int bit = AUDIT_BITMASK_SIZE * 32 - i - 1; |
| 277 | __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)]; |
| 278 | __u32 *class; |
| 279 | |
| 280 | if (!(*p & AUDIT_BIT(bit))) |
| 281 | continue; |
| 282 | *p &= ~AUDIT_BIT(bit); |
| 283 | class = classes[i]; |
| 284 | if (class) { |
| 285 | int j; |
| 286 | for (j = 0; j < AUDIT_BITMASK_SIZE; j++) |
| 287 | entry->rule.mask[j] |= class[j]; |
| 288 | } |
| 289 | } |
| 290 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 291 | return entry; |
| 292 | |
| 293 | exit_err: |
| 294 | return ERR_PTR(err); |
| 295 | } |
| 296 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 297 | static u32 audit_ops[] = |
| 298 | { |
| 299 | [Audit_equal] = AUDIT_EQUAL, |
| 300 | [Audit_not_equal] = AUDIT_NOT_EQUAL, |
| 301 | [Audit_bitmask] = AUDIT_BIT_MASK, |
| 302 | [Audit_bittest] = AUDIT_BIT_TEST, |
| 303 | [Audit_lt] = AUDIT_LESS_THAN, |
| 304 | [Audit_gt] = AUDIT_GREATER_THAN, |
| 305 | [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL, |
| 306 | [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL, |
| 307 | }; |
| 308 | |
| 309 | static u32 audit_to_op(u32 op) |
| 310 | { |
| 311 | u32 n; |
| 312 | for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++) |
| 313 | ; |
| 314 | return n; |
| 315 | } |
| 316 | |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 317 | /* check if an audit field is valid */ |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 318 | 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] | 319 | { |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 320 | switch(f->type) { |
| 321 | case AUDIT_MSGTYPE: |
| 322 | if (entry->rule.listnr != AUDIT_FILTER_TYPE && |
| 323 | entry->rule.listnr != AUDIT_FILTER_USER) |
| 324 | return -EINVAL; |
| 325 | break; |
| 326 | }; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 327 | |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 328 | switch(f->type) { |
| 329 | default: |
| 330 | return -EINVAL; |
| 331 | case AUDIT_UID: |
| 332 | case AUDIT_EUID: |
| 333 | case AUDIT_SUID: |
| 334 | case AUDIT_FSUID: |
| 335 | case AUDIT_LOGINUID: |
| 336 | case AUDIT_OBJ_UID: |
| 337 | case AUDIT_GID: |
| 338 | case AUDIT_EGID: |
| 339 | case AUDIT_SGID: |
| 340 | case AUDIT_FSGID: |
| 341 | case AUDIT_OBJ_GID: |
| 342 | case AUDIT_PID: |
| 343 | case AUDIT_PERS: |
| 344 | case AUDIT_MSGTYPE: |
| 345 | case AUDIT_PPID: |
| 346 | case AUDIT_DEVMAJOR: |
| 347 | case AUDIT_DEVMINOR: |
| 348 | case AUDIT_EXIT: |
| 349 | case AUDIT_SUCCESS: |
Eric Paris | 7812203 | 2013-09-04 15:01:43 -0400 | [diff] [blame] | 350 | case AUDIT_INODE: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 351 | /* bit ops are only useful on syscall args */ |
| 352 | if (f->op == Audit_bitmask || f->op == Audit_bittest) |
| 353 | return -EINVAL; |
| 354 | break; |
| 355 | case AUDIT_ARG0: |
| 356 | case AUDIT_ARG1: |
| 357 | case AUDIT_ARG2: |
| 358 | case AUDIT_ARG3: |
| 359 | case AUDIT_SUBJ_USER: |
| 360 | case AUDIT_SUBJ_ROLE: |
| 361 | case AUDIT_SUBJ_TYPE: |
| 362 | case AUDIT_SUBJ_SEN: |
| 363 | case AUDIT_SUBJ_CLR: |
| 364 | case AUDIT_OBJ_USER: |
| 365 | case AUDIT_OBJ_ROLE: |
| 366 | case AUDIT_OBJ_TYPE: |
| 367 | case AUDIT_OBJ_LEV_LOW: |
| 368 | case AUDIT_OBJ_LEV_HIGH: |
| 369 | case AUDIT_WATCH: |
| 370 | case AUDIT_DIR: |
| 371 | case AUDIT_FILTERKEY: |
| 372 | break; |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 373 | case AUDIT_LOGINUID_SET: |
| 374 | if ((f->val != 0) && (f->val != 1)) |
| 375 | return -EINVAL; |
| 376 | /* FALL THROUGH */ |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 377 | case AUDIT_ARCH: |
| 378 | if (f->op != Audit_not_equal && f->op != Audit_equal) |
| 379 | return -EINVAL; |
| 380 | break; |
| 381 | case AUDIT_PERM: |
| 382 | if (f->val & ~15) |
| 383 | return -EINVAL; |
| 384 | break; |
| 385 | case AUDIT_FILETYPE: |
| 386 | if (f->val & ~S_IFMT) |
| 387 | return -EINVAL; |
| 388 | break; |
| 389 | case AUDIT_FIELD_COMPARE: |
| 390 | if (f->val > AUDIT_MAX_FIELD_COMPARE) |
| 391 | return -EINVAL; |
| 392 | break; |
| 393 | }; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 394 | return 0; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* Translate struct audit_rule_data to kernel's rule respresentation. */ |
| 398 | static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, |
| 399 | size_t datasz) |
| 400 | { |
| 401 | int err = 0; |
| 402 | struct audit_entry *entry; |
| 403 | void *bufp; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 404 | size_t remain = datasz - sizeof(struct audit_rule_data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 405 | int i; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 406 | char *str; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 407 | |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 408 | entry = audit_to_entry_common(data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 409 | if (IS_ERR(entry)) |
| 410 | goto exit_nofree; |
| 411 | |
| 412 | bufp = data->buf; |
| 413 | entry->rule.vers_ops = 2; |
| 414 | for (i = 0; i < data->field_count; i++) { |
| 415 | struct audit_field *f = &entry->rule.fields[i]; |
| 416 | |
| 417 | err = -EINVAL; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 418 | |
| 419 | f->op = audit_to_op(data->fieldflags[i]); |
| 420 | if (f->op == Audit_bad) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 421 | goto exit_free; |
| 422 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 423 | f->type = data->fields[i]; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 424 | f->val = data->values[i]; |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 425 | f->uid = INVALID_UID; |
| 426 | f->gid = INVALID_GID; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 427 | f->lsm_str = NULL; |
| 428 | f->lsm_rule = NULL; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 429 | |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 430 | /* Support legacy tests for a valid loginuid */ |
Richard Guy Briggs | 42f7446 | 2013-05-20 15:08:18 -0400 | [diff] [blame] | 431 | if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 432 | f->type = AUDIT_LOGINUID_SET; |
| 433 | f->val = 0; |
| 434 | } |
| 435 | |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 436 | if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) { |
| 437 | struct pid *pid; |
| 438 | rcu_read_lock(); |
| 439 | pid = find_vpid(f->val); |
| 440 | if (!pid) { |
| 441 | rcu_read_unlock(); |
| 442 | err = -ESRCH; |
| 443 | goto exit_free; |
| 444 | } |
| 445 | f->val = pid_nr(pid); |
| 446 | rcu_read_unlock(); |
| 447 | } |
| 448 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 449 | err = audit_field_valid(entry, f); |
| 450 | if (err) |
| 451 | goto exit_free; |
| 452 | |
| 453 | err = -EINVAL; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 454 | switch (f->type) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 455 | case AUDIT_LOGINUID: |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 456 | case AUDIT_UID: |
| 457 | case AUDIT_EUID: |
| 458 | case AUDIT_SUID: |
| 459 | case AUDIT_FSUID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 460 | case AUDIT_OBJ_UID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 461 | f->uid = make_kuid(current_user_ns(), f->val); |
| 462 | if (!uid_valid(f->uid)) |
| 463 | goto exit_free; |
| 464 | break; |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 465 | case AUDIT_GID: |
| 466 | case AUDIT_EGID: |
| 467 | case AUDIT_SGID: |
| 468 | case AUDIT_FSGID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 469 | case AUDIT_OBJ_GID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 470 | f->gid = make_kgid(current_user_ns(), f->val); |
| 471 | if (!gid_valid(f->gid)) |
| 472 | goto exit_free; |
| 473 | break; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 474 | case AUDIT_ARCH: |
| 475 | entry->rule.arch_f = f; |
| 476 | break; |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 477 | case AUDIT_SUBJ_USER: |
| 478 | case AUDIT_SUBJ_ROLE: |
| 479 | case AUDIT_SUBJ_TYPE: |
| 480 | case AUDIT_SUBJ_SEN: |
| 481 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 482 | case AUDIT_OBJ_USER: |
| 483 | case AUDIT_OBJ_ROLE: |
| 484 | case AUDIT_OBJ_TYPE: |
| 485 | case AUDIT_OBJ_LEV_LOW: |
| 486 | case AUDIT_OBJ_LEV_HIGH: |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 487 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 488 | if (IS_ERR(str)) |
| 489 | goto exit_free; |
| 490 | entry->rule.buflen += f->val; |
| 491 | |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 492 | err = security_audit_rule_init(f->type, f->op, str, |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 493 | (void **)&f->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 494 | /* Keep currently invalid fields around in case they |
| 495 | * become valid after a policy reload. */ |
| 496 | if (err == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 497 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 498 | str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 499 | err = 0; |
| 500 | } |
| 501 | if (err) { |
| 502 | kfree(str); |
| 503 | goto exit_free; |
| 504 | } else |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 505 | f->lsm_str = str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 506 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 507 | case AUDIT_WATCH: |
| 508 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 509 | if (IS_ERR(str)) |
| 510 | goto exit_free; |
| 511 | entry->rule.buflen += f->val; |
| 512 | |
| 513 | err = audit_to_watch(&entry->rule, str, f->val, f->op); |
| 514 | if (err) { |
| 515 | kfree(str); |
| 516 | goto exit_free; |
| 517 | } |
| 518 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 519 | case AUDIT_DIR: |
| 520 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 521 | if (IS_ERR(str)) |
| 522 | goto exit_free; |
| 523 | entry->rule.buflen += f->val; |
| 524 | |
| 525 | err = audit_make_tree(&entry->rule, str, f->op); |
| 526 | kfree(str); |
| 527 | if (err) |
| 528 | goto exit_free; |
| 529 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 530 | case AUDIT_INODE: |
| 531 | err = audit_to_inode(&entry->rule, f); |
| 532 | if (err) |
| 533 | goto exit_free; |
| 534 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 535 | case AUDIT_FILTERKEY: |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 536 | if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN) |
| 537 | goto exit_free; |
| 538 | str = audit_unpack_string(&bufp, &remain, f->val); |
| 539 | if (IS_ERR(str)) |
| 540 | goto exit_free; |
| 541 | entry->rule.buflen += f->val; |
| 542 | entry->rule.filterkey = str; |
| 543 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 544 | } |
| 545 | } |
| 546 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 547 | if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal) |
| 548 | entry->rule.inode_f = NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 549 | |
| 550 | exit_nofree: |
| 551 | return entry; |
| 552 | |
| 553 | exit_free: |
Chen Gang | 373e0f3 | 2013-04-29 15:05:18 -0700 | [diff] [blame] | 554 | if (entry->rule.watch) |
| 555 | audit_put_watch(entry->rule.watch); /* matches initial get */ |
| 556 | if (entry->rule.tree) |
| 557 | audit_put_tree(entry->rule.tree); /* that's the temporary one */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 558 | audit_free_rule(entry); |
| 559 | return ERR_PTR(err); |
| 560 | } |
| 561 | |
| 562 | /* Pack a filter field's string representation into data block. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 563 | static inline size_t audit_pack_string(void **bufp, const char *str) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 564 | { |
| 565 | size_t len = strlen(str); |
| 566 | |
| 567 | memcpy(*bufp, str, len); |
| 568 | *bufp += len; |
| 569 | |
| 570 | return len; |
| 571 | } |
| 572 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 573 | /* Translate kernel rule respresentation to struct audit_rule_data. */ |
| 574 | static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) |
| 575 | { |
| 576 | struct audit_rule_data *data; |
| 577 | void *bufp; |
| 578 | int i; |
| 579 | |
| 580 | data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL); |
| 581 | if (unlikely(!data)) |
Amy Griffis | 0a3b483 | 2006-05-02 15:06:01 -0400 | [diff] [blame] | 582 | return NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 583 | memset(data, 0, sizeof(*data)); |
| 584 | |
| 585 | data->flags = krule->flags | krule->listnr; |
| 586 | data->action = krule->action; |
| 587 | data->field_count = krule->field_count; |
| 588 | bufp = data->buf; |
| 589 | for (i = 0; i < data->field_count; i++) { |
| 590 | struct audit_field *f = &krule->fields[i]; |
| 591 | |
| 592 | data->fields[i] = f->type; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 593 | data->fieldflags[i] = audit_ops[f->op]; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 594 | switch(f->type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 595 | case AUDIT_SUBJ_USER: |
| 596 | case AUDIT_SUBJ_ROLE: |
| 597 | case AUDIT_SUBJ_TYPE: |
| 598 | case AUDIT_SUBJ_SEN: |
| 599 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 600 | case AUDIT_OBJ_USER: |
| 601 | case AUDIT_OBJ_ROLE: |
| 602 | case AUDIT_OBJ_TYPE: |
| 603 | case AUDIT_OBJ_LEV_LOW: |
| 604 | case AUDIT_OBJ_LEV_HIGH: |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 605 | data->buflen += data->values[i] = |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 606 | audit_pack_string(&bufp, f->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 607 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 608 | case AUDIT_WATCH: |
| 609 | data->buflen += data->values[i] = |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 610 | audit_pack_string(&bufp, |
| 611 | audit_watch_path(krule->watch)); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 612 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 613 | case AUDIT_DIR: |
| 614 | data->buflen += data->values[i] = |
| 615 | audit_pack_string(&bufp, |
| 616 | audit_tree_path(krule->tree)); |
| 617 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 618 | case AUDIT_FILTERKEY: |
| 619 | data->buflen += data->values[i] = |
| 620 | audit_pack_string(&bufp, krule->filterkey); |
| 621 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 622 | default: |
| 623 | data->values[i] = f->val; |
| 624 | } |
| 625 | } |
| 626 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i]; |
| 627 | |
| 628 | return data; |
| 629 | } |
| 630 | |
| 631 | /* Compare two rules in kernel format. Considered success if rules |
| 632 | * don't match. */ |
| 633 | 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] | 634 | { |
| 635 | int i; |
| 636 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 637 | if (a->flags != b->flags || |
| 638 | a->listnr != b->listnr || |
| 639 | a->action != b->action || |
| 640 | a->field_count != b->field_count) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 641 | return 1; |
| 642 | |
| 643 | for (i = 0; i < a->field_count; i++) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 644 | if (a->fields[i].type != b->fields[i].type || |
| 645 | a->fields[i].op != b->fields[i].op) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 646 | return 1; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 647 | |
| 648 | switch(a->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 649 | case AUDIT_SUBJ_USER: |
| 650 | case AUDIT_SUBJ_ROLE: |
| 651 | case AUDIT_SUBJ_TYPE: |
| 652 | case AUDIT_SUBJ_SEN: |
| 653 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 654 | case AUDIT_OBJ_USER: |
| 655 | case AUDIT_OBJ_ROLE: |
| 656 | case AUDIT_OBJ_TYPE: |
| 657 | case AUDIT_OBJ_LEV_LOW: |
| 658 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 659 | if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 660 | return 1; |
| 661 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 662 | case AUDIT_WATCH: |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 663 | if (strcmp(audit_watch_path(a->watch), |
| 664 | audit_watch_path(b->watch))) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 665 | return 1; |
| 666 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 667 | case AUDIT_DIR: |
| 668 | if (strcmp(audit_tree_path(a->tree), |
| 669 | audit_tree_path(b->tree))) |
| 670 | return 1; |
| 671 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 672 | case AUDIT_FILTERKEY: |
| 673 | /* both filterkeys exist based on above type compare */ |
| 674 | if (strcmp(a->filterkey, b->filterkey)) |
| 675 | return 1; |
| 676 | break; |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 677 | case AUDIT_UID: |
| 678 | case AUDIT_EUID: |
| 679 | case AUDIT_SUID: |
| 680 | case AUDIT_FSUID: |
| 681 | case AUDIT_LOGINUID: |
| 682 | case AUDIT_OBJ_UID: |
| 683 | if (!uid_eq(a->fields[i].uid, b->fields[i].uid)) |
| 684 | return 1; |
| 685 | break; |
| 686 | case AUDIT_GID: |
| 687 | case AUDIT_EGID: |
| 688 | case AUDIT_SGID: |
| 689 | case AUDIT_FSGID: |
| 690 | case AUDIT_OBJ_GID: |
| 691 | if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) |
| 692 | return 1; |
| 693 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 694 | default: |
| 695 | if (a->fields[i].val != b->fields[i].val) |
| 696 | return 1; |
| 697 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 698 | } |
| 699 | |
| 700 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 701 | if (a->mask[i] != b->mask[i]) |
| 702 | return 1; |
| 703 | |
| 704 | return 0; |
| 705 | } |
| 706 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 707 | /* Duplicate LSM field information. The lsm_rule is opaque, so must be |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 708 | * re-initialized. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 709 | static inline int audit_dupe_lsm_field(struct audit_field *df, |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 710 | struct audit_field *sf) |
| 711 | { |
| 712 | int ret = 0; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 713 | char *lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 714 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 715 | /* our own copy of lsm_str */ |
| 716 | lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); |
| 717 | if (unlikely(!lsm_str)) |
Akinobu Mita | 3e1fbd1 | 2006-12-22 01:10:02 -0800 | [diff] [blame] | 718 | return -ENOMEM; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 719 | df->lsm_str = lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 720 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 721 | /* our own (refreshed) copy of lsm_rule */ |
| 722 | ret = security_audit_rule_init(df->type, df->op, df->lsm_str, |
| 723 | (void **)&df->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 724 | /* Keep currently invalid fields around in case they |
| 725 | * become valid after a policy reload. */ |
| 726 | if (ret == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 727 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 728 | df->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 729 | ret = 0; |
| 730 | } |
| 731 | |
| 732 | return ret; |
| 733 | } |
| 734 | |
| 735 | /* 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] | 736 | * of the watch - that pointer is carried over. The LSM specific fields |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 737 | * 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] | 738 | * rule with the new rule in the filterlist, then free the old rule. |
| 739 | * The rlist element is undefined; list manipulations are handled apart from |
| 740 | * the initial copy. */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 741 | struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 742 | { |
| 743 | u32 fcount = old->field_count; |
| 744 | struct audit_entry *entry; |
| 745 | struct audit_krule *new; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 746 | char *fk; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 747 | int i, err = 0; |
| 748 | |
| 749 | entry = audit_init_entry(fcount); |
| 750 | if (unlikely(!entry)) |
| 751 | return ERR_PTR(-ENOMEM); |
| 752 | |
| 753 | new = &entry->rule; |
| 754 | new->vers_ops = old->vers_ops; |
| 755 | new->flags = old->flags; |
| 756 | new->listnr = old->listnr; |
| 757 | new->action = old->action; |
| 758 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 759 | new->mask[i] = old->mask[i]; |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 760 | new->prio = old->prio; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 761 | new->buflen = old->buflen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 762 | new->inode_f = old->inode_f; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 763 | new->field_count = old->field_count; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 764 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 765 | /* |
| 766 | * note that we are OK with not refcounting here; audit_match_tree() |
| 767 | * never dereferences tree and we can't get false positives there |
| 768 | * since we'd have to have rule gone from the list *and* removed |
| 769 | * before the chunks found by lookup had been allocated, i.e. before |
| 770 | * the beginning of list scan. |
| 771 | */ |
| 772 | new->tree = old->tree; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 773 | memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
| 774 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 775 | /* deep copy this information, updating the lsm_rule fields, because |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 776 | * the originals will all be freed when the old rule is freed. */ |
| 777 | for (i = 0; i < fcount; i++) { |
| 778 | switch (new->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 779 | case AUDIT_SUBJ_USER: |
| 780 | case AUDIT_SUBJ_ROLE: |
| 781 | case AUDIT_SUBJ_TYPE: |
| 782 | case AUDIT_SUBJ_SEN: |
| 783 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 784 | case AUDIT_OBJ_USER: |
| 785 | case AUDIT_OBJ_ROLE: |
| 786 | case AUDIT_OBJ_TYPE: |
| 787 | case AUDIT_OBJ_LEV_LOW: |
| 788 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 789 | err = audit_dupe_lsm_field(&new->fields[i], |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 790 | &old->fields[i]); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 791 | break; |
| 792 | case AUDIT_FILTERKEY: |
| 793 | fk = kstrdup(old->filterkey, GFP_KERNEL); |
| 794 | if (unlikely(!fk)) |
| 795 | err = -ENOMEM; |
| 796 | else |
| 797 | new->filterkey = fk; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 798 | } |
| 799 | if (err) { |
| 800 | audit_free_rule(entry); |
| 801 | return ERR_PTR(err); |
| 802 | } |
| 803 | } |
| 804 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 805 | if (old->watch) { |
| 806 | audit_get_watch(old->watch); |
| 807 | new->watch = old->watch; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 808 | } |
| 809 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 810 | return entry; |
| 811 | } |
| 812 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 813 | /* Find an existing audit rule. |
| 814 | * Caller must hold audit_filter_mutex to prevent stale rule data. */ |
| 815 | static struct audit_entry *audit_find_rule(struct audit_entry *entry, |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 816 | struct list_head **p) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 817 | { |
| 818 | struct audit_entry *e, *found = NULL; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 819 | struct list_head *list; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 820 | int h; |
| 821 | |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 822 | if (entry->rule.inode_f) { |
| 823 | h = audit_hash_ino(entry->rule.inode_f->val); |
| 824 | *p = list = &audit_inode_hash[h]; |
| 825 | } else if (entry->rule.watch) { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 826 | /* we don't know the inode number, so must walk entire hash */ |
| 827 | for (h = 0; h < AUDIT_INODE_BUCKETS; h++) { |
| 828 | list = &audit_inode_hash[h]; |
| 829 | list_for_each_entry(e, list, list) |
| 830 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 831 | found = e; |
| 832 | goto out; |
| 833 | } |
| 834 | } |
| 835 | goto out; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 836 | } else { |
| 837 | *p = list = &audit_filter_list[entry->rule.listnr]; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | list_for_each_entry(e, list, list) |
| 841 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 842 | found = e; |
| 843 | goto out; |
| 844 | } |
| 845 | |
| 846 | out: |
| 847 | return found; |
| 848 | } |
| 849 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 850 | static u64 prio_low = ~0ULL/2; |
| 851 | static u64 prio_high = ~0ULL/2 - 1; |
| 852 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 853 | /* Add rule to given filterlist if not a duplicate. */ |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 854 | static inline int audit_add_rule(struct audit_entry *entry) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 855 | { |
| 856 | struct audit_entry *e; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 857 | struct audit_watch *watch = entry->rule.watch; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 858 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 859 | struct list_head *list; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 860 | int err; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 861 | #ifdef CONFIG_AUDITSYSCALL |
| 862 | int dont_count = 0; |
| 863 | |
| 864 | /* If either of these, don't count towards total */ |
| 865 | if (entry->rule.listnr == AUDIT_FILTER_USER || |
| 866 | entry->rule.listnr == AUDIT_FILTER_TYPE) |
| 867 | dont_count = 1; |
| 868 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 869 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 870 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 871 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 872 | if (e) { |
Eric Paris | 35fe4d0 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 873 | mutex_unlock(&audit_filter_mutex); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 874 | err = -EEXIST; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 875 | /* normally audit_add_tree_rule() will free it on failure */ |
| 876 | if (tree) |
| 877 | audit_put_tree(tree); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 878 | goto error; |
| 879 | } |
| 880 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 881 | if (watch) { |
| 882 | /* audit_filter_mutex is dropped and re-taken during this call */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 883 | err = audit_add_watch(&entry->rule, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 884 | if (err) { |
| 885 | mutex_unlock(&audit_filter_mutex); |
Chen Gang | 2f992ee | 2013-07-08 15:59:38 -0700 | [diff] [blame] | 886 | /* |
| 887 | * normally audit_add_tree_rule() will free it |
| 888 | * on failure |
| 889 | */ |
| 890 | if (tree) |
| 891 | audit_put_tree(tree); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 892 | goto error; |
| 893 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 894 | } |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 895 | if (tree) { |
| 896 | err = audit_add_tree_rule(&entry->rule); |
| 897 | if (err) { |
| 898 | mutex_unlock(&audit_filter_mutex); |
| 899 | goto error; |
| 900 | } |
| 901 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 902 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 903 | entry->rule.prio = ~0ULL; |
| 904 | if (entry->rule.listnr == AUDIT_FILTER_EXIT) { |
| 905 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) |
| 906 | entry->rule.prio = ++prio_high; |
| 907 | else |
| 908 | entry->rule.prio = --prio_low; |
| 909 | } |
| 910 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 911 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 912 | list_add(&entry->rule.list, |
| 913 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 914 | list_add_rcu(&entry->list, list); |
Amy Griffis | 6a2bcee | 2006-06-02 13:16:01 -0400 | [diff] [blame] | 915 | entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 916 | } else { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 917 | list_add_tail(&entry->rule.list, |
| 918 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 919 | list_add_tail_rcu(&entry->list, list); |
| 920 | } |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 921 | #ifdef CONFIG_AUDITSYSCALL |
| 922 | if (!dont_count) |
| 923 | audit_n_rules++; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 924 | |
| 925 | if (!audit_match_signal(entry)) |
| 926 | audit_signals++; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 927 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 928 | mutex_unlock(&audit_filter_mutex); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 929 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 930 | return 0; |
| 931 | |
| 932 | error: |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 933 | if (watch) |
| 934 | audit_put_watch(watch); /* tmp watch, matches initial get */ |
| 935 | return err; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 936 | } |
| 937 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 938 | /* Remove an existing rule from filterlist. */ |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 939 | static inline int audit_del_rule(struct audit_entry *entry) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 940 | { |
| 941 | struct audit_entry *e; |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 942 | struct audit_watch *watch = entry->rule.watch; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 943 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 944 | struct list_head *list; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 945 | int ret = 0; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 946 | #ifdef CONFIG_AUDITSYSCALL |
| 947 | int dont_count = 0; |
| 948 | |
| 949 | /* If either of these, don't count towards total */ |
| 950 | if (entry->rule.listnr == AUDIT_FILTER_USER || |
| 951 | entry->rule.listnr == AUDIT_FILTER_TYPE) |
| 952 | dont_count = 1; |
| 953 | #endif |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 954 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 955 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 956 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 957 | if (!e) { |
| 958 | mutex_unlock(&audit_filter_mutex); |
| 959 | ret = -ENOENT; |
| 960 | goto out; |
| 961 | } |
| 962 | |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 963 | if (e->rule.watch) |
Eric Paris | a05fb6c | 2009-12-17 20:12:05 -0500 | [diff] [blame] | 964 | audit_remove_watch_rule(&e->rule); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 965 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 966 | if (e->rule.tree) |
| 967 | audit_remove_tree_rule(&e->rule); |
| 968 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 969 | list_del_rcu(&e->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 970 | list_del(&e->rule.list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 971 | call_rcu(&e->rcu, audit_free_rule_rcu); |
| 972 | |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 973 | #ifdef CONFIG_AUDITSYSCALL |
| 974 | if (!dont_count) |
| 975 | audit_n_rules--; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 976 | |
| 977 | if (!audit_match_signal(entry)) |
| 978 | audit_signals--; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 979 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 980 | mutex_unlock(&audit_filter_mutex); |
| 981 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 982 | out: |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 983 | if (watch) |
| 984 | audit_put_watch(watch); /* match initial get */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 985 | if (tree) |
| 986 | audit_put_tree(tree); /* that's the temporary one */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 987 | |
| 988 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 989 | } |
| 990 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 991 | /* List rules using struct audit_rule_data. */ |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 992 | 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] | 993 | { |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 994 | struct sk_buff *skb; |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 995 | struct audit_krule *r; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 996 | int i; |
| 997 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 998 | /* This is a blocking read, so use audit_filter_mutex instead of rcu |
| 999 | * iterator to sync with list writers. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1000 | for (i=0; i<AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1001 | list_for_each_entry(r, &audit_rules_list[i], list) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1002 | struct audit_rule_data *data; |
| 1003 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1004 | data = audit_krule_to_data(r); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1005 | if (unlikely(!data)) |
| 1006 | break; |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1007 | skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, |
| 1008 | 0, 1, data, |
| 1009 | sizeof(*data) + data->buflen); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1010 | if (skb) |
| 1011 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1012 | kfree(data); |
| 1013 | } |
| 1014 | } |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1015 | 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] | 1016 | if (skb) |
| 1017 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1018 | } |
| 1019 | |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1020 | /* Log rule additions and removals */ |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1021 | 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] | 1022 | { |
| 1023 | struct audit_buffer *ab; |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1024 | uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
Eric Paris | 4440e85 | 2013-11-27 17:35:17 -0500 | [diff] [blame] | 1025 | unsigned int sessionid = audit_get_sessionid(current); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1026 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 1027 | if (!audit_enabled) |
| 1028 | return; |
| 1029 | |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1030 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
| 1031 | if (!ab) |
| 1032 | return; |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1033 | audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 1034 | audit_log_task_context(ab); |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1035 | audit_log_format(ab, " op="); |
| 1036 | audit_log_string(ab, action); |
| 1037 | audit_log_key(ab, rule->filterkey); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1038 | audit_log_format(ab, " list=%d res=%d", rule->listnr, res); |
| 1039 | audit_log_end(ab); |
| 1040 | } |
| 1041 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1042 | /** |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1043 | * audit_rule_change - apply all rules to the specified message type |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1044 | * @type: audit message type |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 1045 | * @portid: target port id for netlink audit messages |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1046 | * @seq: netlink audit message sequence (serial) number |
| 1047 | * @data: payload data |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1048 | * @datasz: size of payload data |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1049 | */ |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1050 | int audit_rule_change(int type, __u32 portid, int seq, void *data, |
| 1051 | size_t datasz) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1052 | { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1053 | int err = 0; |
| 1054 | struct audit_entry *entry; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1055 | |
| 1056 | switch (type) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1057 | case AUDIT_ADD_RULE: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 1058 | entry = audit_data_to_entry(data, datasz); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1059 | if (IS_ERR(entry)) |
| 1060 | return PTR_ERR(entry); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1061 | |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1062 | err = audit_add_rule(entry); |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1063 | audit_log_rule_change("add rule", &entry->rule, !err); |
Steve Grubb | 5d33010 | 2006-01-09 09:48:17 -0500 | [diff] [blame] | 1064 | if (err) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1065 | audit_free_rule(entry); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1066 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1067 | case AUDIT_DEL_RULE: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 1068 | entry = audit_data_to_entry(data, datasz); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1069 | if (IS_ERR(entry)) |
| 1070 | return PTR_ERR(entry); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1071 | |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1072 | err = audit_del_rule(entry); |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1073 | audit_log_rule_change("remove rule", &entry->rule, !err); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1074 | audit_free_rule(entry); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1075 | break; |
| 1076 | default: |
| 1077 | return -EINVAL; |
| 1078 | } |
| 1079 | |
| 1080 | return err; |
| 1081 | } |
| 1082 | |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1083 | /** |
| 1084 | * audit_list_rules_send - list the audit rules |
Eric W. Biederman | d211f177 | 2014-03-08 15:31:54 -0800 | [diff] [blame] | 1085 | * @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] | 1086 | * @seq: netlink audit message sequence (serial) number |
| 1087 | */ |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1088 | 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] | 1089 | { |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1090 | u32 portid = NETLINK_CB(request_skb).portid; |
| 1091 | struct net *net = sock_net(NETLINK_CB(request_skb).sk); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1092 | struct task_struct *tsk; |
| 1093 | struct audit_netlink_list *dest; |
| 1094 | int err = 0; |
| 1095 | |
| 1096 | /* We can't just spew out the rules here because we might fill |
| 1097 | * the available socket buffer space and deadlock waiting for |
| 1098 | * auditctl to read from it... which isn't ever going to |
| 1099 | * happen if we're actually running in the context of auditctl |
| 1100 | * trying to _send_ the stuff */ |
| 1101 | |
| 1102 | dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); |
| 1103 | if (!dest) |
| 1104 | return -ENOMEM; |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1105 | dest->net = get_net(net); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1106 | dest->portid = portid; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1107 | skb_queue_head_init(&dest->q); |
| 1108 | |
| 1109 | mutex_lock(&audit_filter_mutex); |
| 1110 | audit_list_rules(portid, seq, &dest->q); |
| 1111 | mutex_unlock(&audit_filter_mutex); |
| 1112 | |
| 1113 | tsk = kthread_run(audit_send_list, dest, "audit_send_list"); |
| 1114 | if (IS_ERR(tsk)) { |
| 1115 | skb_queue_purge(&dest->q); |
| 1116 | kfree(dest); |
| 1117 | err = PTR_ERR(tsk); |
| 1118 | } |
| 1119 | |
| 1120 | return err; |
| 1121 | } |
| 1122 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1123 | int audit_comparator(u32 left, u32 op, u32 right) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1124 | { |
| 1125 | switch (op) { |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1126 | case Audit_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1127 | return (left == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1128 | case Audit_not_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1129 | return (left != right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1130 | case Audit_lt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1131 | return (left < right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1132 | case Audit_le: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1133 | return (left <= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1134 | case Audit_gt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1135 | return (left > right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1136 | case Audit_ge: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1137 | return (left >= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1138 | case Audit_bitmask: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1139 | return (left & right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1140 | case Audit_bittest: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1141 | return ((left & right) == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1142 | default: |
| 1143 | BUG(); |
| 1144 | return 0; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1145 | } |
| 1146 | } |
| 1147 | |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1148 | int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) |
| 1149 | { |
| 1150 | switch (op) { |
| 1151 | case Audit_equal: |
| 1152 | return uid_eq(left, right); |
| 1153 | case Audit_not_equal: |
| 1154 | return !uid_eq(left, right); |
| 1155 | case Audit_lt: |
| 1156 | return uid_lt(left, right); |
| 1157 | case Audit_le: |
| 1158 | return uid_lte(left, right); |
| 1159 | case Audit_gt: |
| 1160 | return uid_gt(left, right); |
| 1161 | case Audit_ge: |
| 1162 | return uid_gte(left, right); |
| 1163 | case Audit_bitmask: |
| 1164 | case Audit_bittest: |
| 1165 | default: |
| 1166 | BUG(); |
| 1167 | return 0; |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | int audit_gid_comparator(kgid_t left, u32 op, kgid_t right) |
| 1172 | { |
| 1173 | switch (op) { |
| 1174 | case Audit_equal: |
| 1175 | return gid_eq(left, right); |
| 1176 | case Audit_not_equal: |
| 1177 | return !gid_eq(left, right); |
| 1178 | case Audit_lt: |
| 1179 | return gid_lt(left, right); |
| 1180 | case Audit_le: |
| 1181 | return gid_lte(left, right); |
| 1182 | case Audit_gt: |
| 1183 | return gid_gt(left, right); |
| 1184 | case Audit_ge: |
| 1185 | return gid_gte(left, right); |
| 1186 | case Audit_bitmask: |
| 1187 | case Audit_bittest: |
| 1188 | default: |
| 1189 | BUG(); |
| 1190 | return 0; |
| 1191 | } |
| 1192 | } |
| 1193 | |
Jeff Layton | bfcec70 | 2012-10-10 15:25:23 -0400 | [diff] [blame] | 1194 | /** |
| 1195 | * parent_len - find the length of the parent portion of a pathname |
| 1196 | * @path: pathname of which to determine length |
| 1197 | */ |
| 1198 | int parent_len(const char *path) |
| 1199 | { |
| 1200 | int plen; |
| 1201 | const char *p; |
| 1202 | |
| 1203 | plen = strlen(path); |
| 1204 | |
| 1205 | if (plen == 0) |
| 1206 | return plen; |
| 1207 | |
| 1208 | /* disregard trailing slashes */ |
| 1209 | p = path + plen - 1; |
| 1210 | while ((*p == '/') && (p > path)) |
| 1211 | p--; |
| 1212 | |
| 1213 | /* walk backward until we find the next slash or hit beginning */ |
| 1214 | while ((*p != '/') && (p > path)) |
| 1215 | p--; |
| 1216 | |
| 1217 | /* did we find a slash? Then increment to include it in path */ |
| 1218 | if (*p == '/') |
| 1219 | p++; |
| 1220 | |
| 1221 | return p - path; |
| 1222 | } |
| 1223 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1224 | /** |
| 1225 | * audit_compare_dname_path - compare given dentry name with last component in |
| 1226 | * given path. Return of 0 indicates a match. |
| 1227 | * @dname: dentry name that we're comparing |
| 1228 | * @path: full pathname that we're comparing |
| 1229 | * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL |
| 1230 | * here indicates that we must compute this value. |
| 1231 | */ |
| 1232 | 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] | 1233 | { |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1234 | int dlen, pathlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1235 | const char *p; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1236 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1237 | dlen = strlen(dname); |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1238 | pathlen = strlen(path); |
| 1239 | if (pathlen < dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1240 | return 1; |
| 1241 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1242 | parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1243 | if (pathlen - parentlen != dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1244 | return 1; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1245 | |
| 1246 | p = path + parentlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1247 | |
| 1248 | return strncmp(p, dname, dlen); |
| 1249 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1250 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1251 | static int audit_filter_user_rules(struct audit_krule *rule, int type, |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1252 | enum audit_state *state) |
| 1253 | { |
| 1254 | int i; |
| 1255 | |
| 1256 | for (i = 0; i < rule->field_count; i++) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1257 | struct audit_field *f = &rule->fields[i]; |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 1258 | pid_t pid; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1259 | int result = 0; |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1260 | u32 sid; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1261 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1262 | switch (f->type) { |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1263 | case AUDIT_PID: |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 1264 | pid = task_pid_nr(current); |
| 1265 | result = audit_comparator(pid, f->op, f->val); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1266 | break; |
| 1267 | case AUDIT_UID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1268 | result = audit_uid_comparator(current_uid(), f->op, f->uid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1269 | break; |
| 1270 | case AUDIT_GID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1271 | result = audit_gid_comparator(current_gid(), f->op, f->gid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1272 | break; |
| 1273 | case AUDIT_LOGINUID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1274 | result = audit_uid_comparator(audit_get_loginuid(current), |
| 1275 | f->op, f->uid); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1276 | break; |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 1277 | case AUDIT_LOGINUID_SET: |
| 1278 | result = audit_comparator(audit_loginuid_set(current), |
| 1279 | f->op, f->val); |
| 1280 | break; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1281 | case AUDIT_MSGTYPE: |
| 1282 | result = audit_comparator(type, f->op, f->val); |
| 1283 | break; |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1284 | case AUDIT_SUBJ_USER: |
| 1285 | case AUDIT_SUBJ_ROLE: |
| 1286 | case AUDIT_SUBJ_TYPE: |
| 1287 | case AUDIT_SUBJ_SEN: |
| 1288 | case AUDIT_SUBJ_CLR: |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1289 | if (f->lsm_rule) { |
| 1290 | security_task_getsecid(current, &sid); |
| 1291 | result = security_audit_rule_match(sid, |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1292 | f->type, |
| 1293 | f->op, |
| 1294 | f->lsm_rule, |
| 1295 | NULL); |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 1296 | } |
Miloslav Trmac | d29be15 | 2010-09-16 18:14:11 -0400 | [diff] [blame] | 1297 | break; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1298 | } |
| 1299 | |
| 1300 | if (!result) |
| 1301 | return 0; |
| 1302 | } |
| 1303 | switch (rule->action) { |
| 1304 | case AUDIT_NEVER: *state = AUDIT_DISABLED; break; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1305 | case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; |
| 1306 | } |
| 1307 | return 1; |
| 1308 | } |
| 1309 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 1310 | int audit_filter_user(int type) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1311 | { |
Ingo Molnar | 11f57ce | 2007-02-10 01:46:09 -0800 | [diff] [blame] | 1312 | enum audit_state state = AUDIT_DISABLED; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1313 | struct audit_entry *e; |
Richard Guy Briggs | 724e4fcc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 1314 | int rc, ret; |
| 1315 | |
| 1316 | ret = 1; /* Audit by default */ |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1317 | |
| 1318 | rcu_read_lock(); |
| 1319 | 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] | 1320 | rc = audit_filter_user_rules(&e->rule, type, &state); |
| 1321 | if (rc) { |
| 1322 | if (rc > 0 && state == AUDIT_DISABLED) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1323 | ret = 0; |
| 1324 | break; |
| 1325 | } |
| 1326 | } |
| 1327 | rcu_read_unlock(); |
| 1328 | |
Richard Guy Briggs | 724e4fcc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 1329 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1330 | } |
| 1331 | |
| 1332 | int audit_filter_type(int type) |
| 1333 | { |
| 1334 | struct audit_entry *e; |
| 1335 | int result = 0; |
Daniel Walker | 9ce3421 | 2007-10-18 03:06:06 -0700 | [diff] [blame] | 1336 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1337 | rcu_read_lock(); |
| 1338 | if (list_empty(&audit_filter_list[AUDIT_FILTER_TYPE])) |
| 1339 | goto unlock_and_return; |
| 1340 | |
| 1341 | list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TYPE], |
| 1342 | list) { |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1343 | int i; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1344 | for (i = 0; i < e->rule.field_count; i++) { |
| 1345 | struct audit_field *f = &e->rule.fields[i]; |
| 1346 | if (f->type == AUDIT_MSGTYPE) { |
| 1347 | result = audit_comparator(type, f->op, f->val); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1348 | if (!result) |
| 1349 | break; |
| 1350 | } |
| 1351 | } |
| 1352 | if (result) |
| 1353 | goto unlock_and_return; |
| 1354 | } |
| 1355 | unlock_and_return: |
| 1356 | rcu_read_unlock(); |
| 1357 | return result; |
| 1358 | } |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1359 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1360 | static int update_lsm_rule(struct audit_krule *r) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1361 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1362 | struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1363 | struct audit_entry *nentry; |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1364 | int err = 0; |
| 1365 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1366 | if (!security_audit_rule_known(r)) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1367 | return 0; |
| 1368 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1369 | nentry = audit_dupe_rule(r); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1370 | if (IS_ERR(nentry)) { |
| 1371 | /* save the first error encountered for the |
| 1372 | * return value */ |
| 1373 | err = PTR_ERR(nentry); |
| 1374 | audit_panic("error updating LSM filters"); |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1375 | if (r->watch) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1376 | list_del(&r->rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1377 | list_del_rcu(&entry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1378 | list_del(&r->list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1379 | } else { |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1380 | if (r->watch || r->tree) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1381 | list_replace_init(&r->rlist, &nentry->rule.rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1382 | list_replace_rcu(&entry->list, &nentry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1383 | list_replace(&r->list, &nentry->rule.list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1384 | } |
| 1385 | call_rcu(&entry->rcu, audit_free_rule_rcu); |
| 1386 | |
| 1387 | return err; |
| 1388 | } |
| 1389 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 1390 | /* 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] | 1391 | * It will traverse the filter lists serarching for rules that contain LSM |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1392 | * 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] | 1393 | * 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] | 1394 | * updated rule. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 1395 | int audit_update_lsm_rules(void) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1396 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1397 | struct audit_krule *r, *n; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1398 | int i, err = 0; |
| 1399 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1400 | /* audit_filter_mutex synchronizes the writers */ |
| 1401 | mutex_lock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1402 | |
| 1403 | for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1404 | list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { |
| 1405 | int res = update_lsm_rule(r); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1406 | if (!err) |
| 1407 | err = res; |
| 1408 | } |
| 1409 | } |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1410 | mutex_unlock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1411 | |
| 1412 | return err; |
| 1413 | } |