Thomas Gleixner | 1a59d1b8 | 2019-05-27 08:55:05 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 2 | /* auditfilter.c -- filtering of audit events |
| 3 | * |
| 4 | * Copyright 2003-2004 Red Hat, Inc. |
| 5 | * Copyright 2005 Hewlett-Packard Development Company, L.P. |
| 6 | * Copyright 2005 IBM Corporation |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 10 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 11 | #include <linux/kernel.h> |
| 12 | #include <linux/audit.h> |
| 13 | #include <linux/kthread.h> |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 14 | #include <linux/mutex.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/namei.h> |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 17 | #include <linux/netlink.h> |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Ahmed S. Darwish | 2a862b3 | 2008-03-01 21:54:38 +0200 | [diff] [blame] | 20 | #include <linux/security.h> |
Eric W. Biederman | 48095d9 | 2014-02-03 17:25:33 -0800 | [diff] [blame] | 21 | #include <net/net_namespace.h> |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 22 | #include <net/sock.h> |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 23 | #include "audit.h" |
| 24 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 25 | /* |
| 26 | * Locking model: |
| 27 | * |
| 28 | * audit_filter_mutex: |
Scott Matheina | 725131e | 2015-11-04 08:23:51 -0500 | [diff] [blame] | 29 | * Synchronizes writes and blocking reads of audit's filterlist |
| 30 | * data. Rcu is used to traverse the filterlist and access |
| 31 | * contents of structs audit_entry, audit_watch and opaque |
| 32 | * LSM rules during filtering. If modified, these structures |
| 33 | * must be copied and replace their counterparts in the filterlist. |
| 34 | * An audit_parent struct is not accessed during filtering, so may |
| 35 | * be written directly provided audit_filter_mutex is held. |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 36 | */ |
| 37 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 38 | /* Audit filter lists, defined in <linux/audit.h> */ |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 39 | struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { |
| 40 | LIST_HEAD_INIT(audit_filter_list[0]), |
| 41 | LIST_HEAD_INIT(audit_filter_list[1]), |
| 42 | LIST_HEAD_INIT(audit_filter_list[2]), |
| 43 | LIST_HEAD_INIT(audit_filter_list[3]), |
| 44 | LIST_HEAD_INIT(audit_filter_list[4]), |
| 45 | LIST_HEAD_INIT(audit_filter_list[5]), |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 46 | LIST_HEAD_INIT(audit_filter_list[6]), |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 47 | LIST_HEAD_INIT(audit_filter_list[7]), |
| 48 | #if AUDIT_NR_FILTERS != 8 |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 49 | #error Fix audit_filter_list initialiser |
| 50 | #endif |
| 51 | }; |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 52 | static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = { |
| 53 | LIST_HEAD_INIT(audit_rules_list[0]), |
| 54 | LIST_HEAD_INIT(audit_rules_list[1]), |
| 55 | LIST_HEAD_INIT(audit_rules_list[2]), |
| 56 | LIST_HEAD_INIT(audit_rules_list[3]), |
| 57 | LIST_HEAD_INIT(audit_rules_list[4]), |
| 58 | LIST_HEAD_INIT(audit_rules_list[5]), |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 59 | LIST_HEAD_INIT(audit_rules_list[6]), |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 60 | LIST_HEAD_INIT(audit_rules_list[7]), |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 61 | }; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 62 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 63 | DEFINE_MUTEX(audit_filter_mutex); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 64 | |
Richard Guy Briggs | 219ca39 | 2014-03-26 07:26:47 -0400 | [diff] [blame] | 65 | static void audit_free_lsm_field(struct audit_field *f) |
| 66 | { |
| 67 | switch (f->type) { |
| 68 | case AUDIT_SUBJ_USER: |
| 69 | case AUDIT_SUBJ_ROLE: |
| 70 | case AUDIT_SUBJ_TYPE: |
| 71 | case AUDIT_SUBJ_SEN: |
| 72 | case AUDIT_SUBJ_CLR: |
| 73 | case AUDIT_OBJ_USER: |
| 74 | case AUDIT_OBJ_ROLE: |
| 75 | case AUDIT_OBJ_TYPE: |
| 76 | case AUDIT_OBJ_LEV_LOW: |
| 77 | case AUDIT_OBJ_LEV_HIGH: |
| 78 | kfree(f->lsm_str); |
| 79 | security_audit_rule_free(f->lsm_rule); |
| 80 | } |
| 81 | } |
| 82 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 83 | static inline void audit_free_rule(struct audit_entry *e) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 84 | { |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 85 | int i; |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 86 | struct audit_krule *erule = &e->rule; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 87 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 88 | /* some rules don't have associated watches */ |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 89 | if (erule->watch) |
| 90 | audit_put_watch(erule->watch); |
| 91 | if (erule->fields) |
Richard Guy Briggs | 219ca39 | 2014-03-26 07:26:47 -0400 | [diff] [blame] | 92 | for (i = 0; i < erule->field_count; i++) |
| 93 | audit_free_lsm_field(&erule->fields[i]); |
Zhenwen Xu | c28bb7d | 2009-03-12 22:16:12 +0800 | [diff] [blame] | 94 | kfree(erule->fields); |
| 95 | kfree(erule->filterkey); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 96 | kfree(e); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 97 | } |
| 98 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 99 | void audit_free_rule_rcu(struct rcu_head *head) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 100 | { |
| 101 | struct audit_entry *e = container_of(head, struct audit_entry, rcu); |
| 102 | audit_free_rule(e); |
| 103 | } |
| 104 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 105 | /* Initialize an audit filterlist entry. */ |
| 106 | static inline struct audit_entry *audit_init_entry(u32 field_count) |
| 107 | { |
| 108 | struct audit_entry *entry; |
| 109 | struct audit_field *fields; |
| 110 | |
| 111 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 112 | if (unlikely(!entry)) |
| 113 | return NULL; |
| 114 | |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 115 | fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 116 | if (unlikely(!fields)) { |
| 117 | kfree(entry); |
| 118 | return NULL; |
| 119 | } |
| 120 | entry->rule.fields = fields; |
| 121 | |
| 122 | return entry; |
| 123 | } |
| 124 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 125 | /* Unpack a filter field's string representation from user-space |
| 126 | * buffer. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 127 | char *audit_unpack_string(void **bufp, size_t *remain, size_t len) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 128 | { |
| 129 | char *str; |
| 130 | |
| 131 | if (!*bufp || (len == 0) || (len > *remain)) |
| 132 | return ERR_PTR(-EINVAL); |
| 133 | |
| 134 | /* Of the currently implemented string fields, PATH_MAX |
| 135 | * defines the longest valid length. |
| 136 | */ |
| 137 | if (len > PATH_MAX) |
| 138 | return ERR_PTR(-ENAMETOOLONG); |
| 139 | |
| 140 | str = kmalloc(len + 1, GFP_KERNEL); |
| 141 | if (unlikely(!str)) |
| 142 | return ERR_PTR(-ENOMEM); |
| 143 | |
| 144 | memcpy(str, *bufp, len); |
| 145 | str[len] = 0; |
| 146 | *bufp += len; |
| 147 | *remain -= len; |
| 148 | |
| 149 | return str; |
| 150 | } |
| 151 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 152 | /* Translate an inode field to kernel representation. */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 153 | static inline int audit_to_inode(struct audit_krule *krule, |
| 154 | struct audit_field *f) |
| 155 | { |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 156 | if ((krule->listnr != AUDIT_FILTER_EXIT && |
| 157 | krule->listnr != AUDIT_FILTER_URING_EXIT) || |
Richard Guy Briggs | 3639f17 | 2014-10-02 22:05:18 -0400 | [diff] [blame] | 158 | krule->inode_f || krule->watch || krule->tree || |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 159 | (f->op != Audit_equal && f->op != Audit_not_equal)) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 160 | return -EINVAL; |
| 161 | |
| 162 | krule->inode_f = f; |
| 163 | return 0; |
| 164 | } |
| 165 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 166 | static __u32 *classes[AUDIT_SYSCALL_CLASSES]; |
| 167 | |
| 168 | int __init audit_register_class(int class, unsigned *list) |
| 169 | { |
Fabian Frederick | bab5e2d | 2014-08-06 16:03:22 -0700 | [diff] [blame] | 170 | __u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL); |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 171 | if (!p) |
| 172 | return -ENOMEM; |
| 173 | while (*list != ~0U) { |
| 174 | unsigned n = *list++; |
| 175 | if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) { |
| 176 | kfree(p); |
| 177 | return -EINVAL; |
| 178 | } |
| 179 | p[AUDIT_WORD(n)] |= AUDIT_BIT(n); |
| 180 | } |
| 181 | if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) { |
| 182 | kfree(p); |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | classes[class] = p; |
| 186 | return 0; |
| 187 | } |
| 188 | |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 189 | int audit_match_class(int class, unsigned syscall) |
| 190 | { |
Klaus Weidner | c926e4f | 2007-05-16 17:45:42 -0500 | [diff] [blame] | 191 | if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32)) |
Al Viro | 55669bf | 2006-08-31 19:26:40 -0400 | [diff] [blame] | 192 | return 0; |
| 193 | if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class])) |
| 194 | return 0; |
| 195 | return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall); |
| 196 | } |
| 197 | |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 198 | #ifdef CONFIG_AUDITSYSCALL |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 199 | static inline int audit_match_class_bits(int class, u32 *mask) |
| 200 | { |
| 201 | int i; |
| 202 | |
| 203 | if (classes[class]) { |
| 204 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 205 | if (mask[i] & classes[class][i]) |
| 206 | return 0; |
| 207 | } |
| 208 | return 1; |
| 209 | } |
| 210 | |
| 211 | static int audit_match_signal(struct audit_entry *entry) |
| 212 | { |
| 213 | struct audit_field *arch = entry->rule.arch_f; |
| 214 | |
| 215 | if (!arch) { |
| 216 | /* When arch is unspecified, we must check both masks on biarch |
| 217 | * as syscall number alone is ambiguous. */ |
| 218 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 219 | entry->rule.mask) && |
| 220 | audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 221 | entry->rule.mask)); |
| 222 | } |
| 223 | |
| 224 | switch(audit_classify_arch(arch->val)) { |
| 225 | case 0: /* native */ |
| 226 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, |
| 227 | entry->rule.mask)); |
| 228 | case 1: /* 32bit on biarch */ |
| 229 | return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, |
| 230 | entry->rule.mask)); |
| 231 | default: |
| 232 | return 1; |
| 233 | } |
| 234 | } |
Al Viro | 327b9ee | 2007-05-15 20:37:10 +0100 | [diff] [blame] | 235 | #endif |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 236 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 237 | /* Common user-space to kernel rule translation. */ |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 238 | 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] | 239 | { |
| 240 | unsigned listnr; |
| 241 | struct audit_entry *entry; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 242 | int i, err; |
| 243 | |
| 244 | err = -EINVAL; |
| 245 | listnr = rule->flags & ~AUDIT_FILTER_PREPEND; |
| 246 | switch(listnr) { |
| 247 | default: |
| 248 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 249 | #ifdef CONFIG_AUDITSYSCALL |
| 250 | case AUDIT_FILTER_ENTRY: |
Richard Guy Briggs | 5260ecc | 2018-02-14 21:47:43 -0500 | [diff] [blame] | 251 | pr_err("AUDIT_FILTER_ENTRY is deprecated\n"); |
| 252 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 253 | case AUDIT_FILTER_EXIT: |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 254 | case AUDIT_FILTER_URING_EXIT: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 255 | case AUDIT_FILTER_TASK: |
| 256 | #endif |
Eric Paris | 7ff68e5 | 2012-01-03 14:23:07 -0500 | [diff] [blame] | 257 | case AUDIT_FILTER_USER: |
Richard Guy Briggs | d904ac0 | 2018-06-05 11:45:07 -0400 | [diff] [blame] | 258 | case AUDIT_FILTER_EXCLUDE: |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 259 | case AUDIT_FILTER_FS: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 260 | ; |
| 261 | } |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 262 | if (unlikely(rule->action == AUDIT_POSSIBLE)) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 263 | pr_err("AUDIT_POSSIBLE is deprecated\n"); |
Al Viro | 014149c | 2006-05-23 01:36:13 -0400 | [diff] [blame] | 264 | goto exit_err; |
| 265 | } |
| 266 | if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 267 | goto exit_err; |
| 268 | if (rule->field_count > AUDIT_MAX_FIELDS) |
| 269 | goto exit_err; |
| 270 | |
| 271 | err = -ENOMEM; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 272 | entry = audit_init_entry(rule->field_count); |
| 273 | if (!entry) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 274 | goto exit_err; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 275 | |
| 276 | entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND; |
| 277 | entry->rule.listnr = listnr; |
| 278 | entry->rule.action = rule->action; |
| 279 | entry->rule.field_count = rule->field_count; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 280 | |
| 281 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 282 | entry->rule.mask[i] = rule->mask[i]; |
| 283 | |
Al Viro | b915543 | 2006-07-01 03:56:16 -0400 | [diff] [blame] | 284 | for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) { |
| 285 | int bit = AUDIT_BITMASK_SIZE * 32 - i - 1; |
| 286 | __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)]; |
| 287 | __u32 *class; |
| 288 | |
| 289 | if (!(*p & AUDIT_BIT(bit))) |
| 290 | continue; |
| 291 | *p &= ~AUDIT_BIT(bit); |
| 292 | class = classes[i]; |
| 293 | if (class) { |
| 294 | int j; |
| 295 | for (j = 0; j < AUDIT_BITMASK_SIZE; j++) |
| 296 | entry->rule.mask[j] |= class[j]; |
| 297 | } |
| 298 | } |
| 299 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 300 | return entry; |
| 301 | |
| 302 | exit_err: |
| 303 | return ERR_PTR(err); |
| 304 | } |
| 305 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 306 | static u32 audit_ops[] = |
| 307 | { |
| 308 | [Audit_equal] = AUDIT_EQUAL, |
| 309 | [Audit_not_equal] = AUDIT_NOT_EQUAL, |
| 310 | [Audit_bitmask] = AUDIT_BIT_MASK, |
| 311 | [Audit_bittest] = AUDIT_BIT_TEST, |
| 312 | [Audit_lt] = AUDIT_LESS_THAN, |
| 313 | [Audit_gt] = AUDIT_GREATER_THAN, |
| 314 | [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL, |
| 315 | [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL, |
| 316 | }; |
| 317 | |
| 318 | static u32 audit_to_op(u32 op) |
| 319 | { |
| 320 | u32 n; |
| 321 | for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++) |
| 322 | ; |
| 323 | return n; |
| 324 | } |
| 325 | |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 326 | /* check if an audit field is valid */ |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 327 | 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] | 328 | { |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 329 | switch (f->type) { |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 330 | case AUDIT_MSGTYPE: |
Richard Guy Briggs | d904ac0 | 2018-06-05 11:45:07 -0400 | [diff] [blame] | 331 | if (entry->rule.listnr != AUDIT_FILTER_EXCLUDE && |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 332 | entry->rule.listnr != AUDIT_FILTER_USER) |
| 333 | return -EINVAL; |
| 334 | break; |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 335 | case AUDIT_FSTYPE: |
| 336 | if (entry->rule.listnr != AUDIT_FILTER_FS) |
| 337 | return -EINVAL; |
| 338 | break; |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 339 | case AUDIT_PERM: |
| 340 | if (entry->rule.listnr == AUDIT_FILTER_URING_EXIT) |
| 341 | return -EINVAL; |
| 342 | break; |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 345 | switch (entry->rule.listnr) { |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 346 | case AUDIT_FILTER_FS: |
| 347 | switch(f->type) { |
| 348 | case AUDIT_FSTYPE: |
| 349 | case AUDIT_FILTERKEY: |
| 350 | break; |
| 351 | default: |
| 352 | return -EINVAL; |
| 353 | } |
Nicholas Mc Guire | b7a84de | 2017-05-02 10:16:03 -0400 | [diff] [blame] | 354 | } |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 355 | |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 356 | /* Check for valid field type and op */ |
| 357 | switch (f->type) { |
| 358 | case AUDIT_ARG0: |
| 359 | case AUDIT_ARG1: |
| 360 | case AUDIT_ARG2: |
| 361 | case AUDIT_ARG3: |
| 362 | case AUDIT_PERS: /* <uapi/linux/personality.h> */ |
| 363 | case AUDIT_DEVMINOR: |
| 364 | /* all ops are valid */ |
| 365 | break; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 366 | case AUDIT_UID: |
| 367 | case AUDIT_EUID: |
| 368 | case AUDIT_SUID: |
| 369 | case AUDIT_FSUID: |
| 370 | case AUDIT_LOGINUID: |
| 371 | case AUDIT_OBJ_UID: |
| 372 | case AUDIT_GID: |
| 373 | case AUDIT_EGID: |
| 374 | case AUDIT_SGID: |
| 375 | case AUDIT_FSGID: |
| 376 | case AUDIT_OBJ_GID: |
| 377 | case AUDIT_PID: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 378 | case AUDIT_MSGTYPE: |
| 379 | case AUDIT_PPID: |
| 380 | case AUDIT_DEVMAJOR: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 381 | case AUDIT_EXIT: |
| 382 | case AUDIT_SUCCESS: |
Eric Paris | 7812203 | 2013-09-04 15:01:43 -0400 | [diff] [blame] | 383 | case AUDIT_INODE: |
Richard Guy Briggs | 8fae477 | 2016-11-20 16:47:55 -0500 | [diff] [blame] | 384 | case AUDIT_SESSIONID: |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 385 | case AUDIT_SUBJ_SEN: |
| 386 | case AUDIT_SUBJ_CLR: |
| 387 | case AUDIT_OBJ_LEV_LOW: |
| 388 | case AUDIT_OBJ_LEV_HIGH: |
Richard Guy Briggs | bf36123 | 2019-05-09 20:01:36 -0400 | [diff] [blame] | 389 | case AUDIT_SADDR_FAM: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 390 | /* bit ops are only useful on syscall args */ |
| 391 | if (f->op == Audit_bitmask || f->op == Audit_bittest) |
| 392 | return -EINVAL; |
| 393 | break; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 394 | case AUDIT_SUBJ_USER: |
| 395 | case AUDIT_SUBJ_ROLE: |
| 396 | case AUDIT_SUBJ_TYPE: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 397 | case AUDIT_OBJ_USER: |
| 398 | case AUDIT_OBJ_ROLE: |
| 399 | case AUDIT_OBJ_TYPE: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 400 | case AUDIT_WATCH: |
| 401 | case AUDIT_DIR: |
| 402 | case AUDIT_FILTERKEY: |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 403 | case AUDIT_LOGINUID_SET: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 404 | case AUDIT_ARCH: |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 405 | case AUDIT_FSTYPE: |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 406 | case AUDIT_PERM: |
| 407 | case AUDIT_FILETYPE: |
| 408 | case AUDIT_FIELD_COMPARE: |
| 409 | case AUDIT_EXE: |
| 410 | /* only equal and not equal valid ops */ |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 411 | if (f->op != Audit_not_equal && f->op != Audit_equal) |
| 412 | return -EINVAL; |
| 413 | break; |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 414 | default: |
| 415 | /* field not recognized */ |
| 416 | return -EINVAL; |
| 417 | } |
| 418 | |
| 419 | /* Check for select valid field values */ |
| 420 | switch (f->type) { |
| 421 | case AUDIT_LOGINUID_SET: |
| 422 | if ((f->val != 0) && (f->val != 1)) |
| 423 | return -EINVAL; |
| 424 | break; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 425 | case AUDIT_PERM: |
| 426 | if (f->val & ~15) |
| 427 | return -EINVAL; |
| 428 | break; |
| 429 | case AUDIT_FILETYPE: |
| 430 | if (f->val & ~S_IFMT) |
| 431 | return -EINVAL; |
| 432 | break; |
| 433 | case AUDIT_FIELD_COMPARE: |
| 434 | if (f->val > AUDIT_MAX_FIELD_COMPARE) |
| 435 | return -EINVAL; |
| 436 | break; |
Richard Guy Briggs | bf36123 | 2019-05-09 20:01:36 -0400 | [diff] [blame] | 437 | case AUDIT_SADDR_FAM: |
| 438 | if (f->val >= AF_MAX) |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 439 | return -EINVAL; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 440 | break; |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 441 | default: |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 442 | break; |
Nicholas Mc Guire | b7a84de | 2017-05-02 10:16:03 -0400 | [diff] [blame] | 443 | } |
Richard Guy Briggs | ecc6890 | 2019-05-22 17:51:09 -0400 | [diff] [blame] | 444 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 445 | return 0; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 446 | } |
| 447 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 448 | /* Translate struct audit_rule_data to kernel's rule representation. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 449 | static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, |
| 450 | size_t datasz) |
| 451 | { |
| 452 | int err = 0; |
| 453 | struct audit_entry *entry; |
| 454 | void *bufp; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 455 | size_t remain = datasz - sizeof(struct audit_rule_data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 456 | int i; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 457 | char *str; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 458 | struct audit_fsnotify_mark *audit_mark; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 459 | |
Eric Paris | 56c4911 | 2014-04-02 15:46:42 -0400 | [diff] [blame] | 460 | entry = audit_to_entry_common(data); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 461 | if (IS_ERR(entry)) |
| 462 | goto exit_nofree; |
| 463 | |
| 464 | bufp = data->buf; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 465 | for (i = 0; i < data->field_count; i++) { |
| 466 | struct audit_field *f = &entry->rule.fields[i]; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 467 | u32 f_val; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 468 | |
| 469 | err = -EINVAL; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 470 | |
| 471 | f->op = audit_to_op(data->fieldflags[i]); |
| 472 | if (f->op == Audit_bad) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 473 | goto exit_free; |
| 474 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 475 | f->type = data->fields[i]; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 476 | f_val = data->values[i]; |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 477 | |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 478 | /* Support legacy tests for a valid loginuid */ |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 479 | if ((f->type == AUDIT_LOGINUID) && (f_val == AUDIT_UID_UNSET)) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 480 | f->type = AUDIT_LOGINUID_SET; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 481 | f_val = 0; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 482 | entry->rule.pflags |= AUDIT_LOGINUID_LEGACY; |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 483 | } |
| 484 | |
Eric Paris | 62062cf | 2013-04-16 13:08:43 -0400 | [diff] [blame] | 485 | err = audit_field_valid(entry, f); |
| 486 | if (err) |
| 487 | goto exit_free; |
| 488 | |
| 489 | err = -EINVAL; |
Eric Paris | ab61d38 | 2013-04-16 17:26:51 -0400 | [diff] [blame] | 490 | switch (f->type) { |
Eric W. Biederman | 780a765 | 2013-04-09 02:22:10 -0700 | [diff] [blame] | 491 | case AUDIT_LOGINUID: |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 492 | case AUDIT_UID: |
| 493 | case AUDIT_EUID: |
| 494 | case AUDIT_SUID: |
| 495 | case AUDIT_FSUID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 496 | case AUDIT_OBJ_UID: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 497 | f->uid = make_kuid(current_user_ns(), f_val); |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 498 | if (!uid_valid(f->uid)) |
| 499 | goto exit_free; |
| 500 | break; |
Al Viro | 0a73dcc | 2006-06-05 08:15:59 -0400 | [diff] [blame] | 501 | case AUDIT_GID: |
| 502 | case AUDIT_EGID: |
| 503 | case AUDIT_SGID: |
| 504 | case AUDIT_FSGID: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 505 | case AUDIT_OBJ_GID: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 506 | f->gid = make_kgid(current_user_ns(), f_val); |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 507 | if (!gid_valid(f->gid)) |
| 508 | goto exit_free; |
| 509 | break; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 510 | case AUDIT_ARCH: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 511 | f->val = f_val; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 512 | entry->rule.arch_f = f; |
| 513 | break; |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 514 | case AUDIT_SUBJ_USER: |
| 515 | case AUDIT_SUBJ_ROLE: |
| 516 | case AUDIT_SUBJ_TYPE: |
| 517 | case AUDIT_SUBJ_SEN: |
| 518 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 519 | case AUDIT_OBJ_USER: |
| 520 | case AUDIT_OBJ_ROLE: |
| 521 | case AUDIT_OBJ_TYPE: |
| 522 | case AUDIT_OBJ_LEV_LOW: |
| 523 | case AUDIT_OBJ_LEV_HIGH: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 524 | str = audit_unpack_string(&bufp, &remain, f_val); |
| 525 | if (IS_ERR(str)) { |
| 526 | err = PTR_ERR(str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 527 | goto exit_free; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 528 | } |
| 529 | entry->rule.buflen += f_val; |
| 530 | f->lsm_str = str; |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 531 | err = security_audit_rule_init(f->type, f->op, str, |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 532 | (void **)&f->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 533 | /* Keep currently invalid fields around in case they |
| 534 | * become valid after a policy reload. */ |
| 535 | if (err == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 536 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 537 | str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 538 | err = 0; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 539 | } else if (err) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 540 | goto exit_free; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 541 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 542 | case AUDIT_WATCH: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 543 | str = audit_unpack_string(&bufp, &remain, f_val); |
| 544 | if (IS_ERR(str)) { |
| 545 | err = PTR_ERR(str); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 546 | goto exit_free; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 547 | } |
| 548 | err = audit_to_watch(&entry->rule, str, f_val, f->op); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 549 | if (err) { |
| 550 | kfree(str); |
| 551 | goto exit_free; |
| 552 | } |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 553 | entry->rule.buflen += f_val; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 554 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 555 | case AUDIT_DIR: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 556 | str = audit_unpack_string(&bufp, &remain, f_val); |
| 557 | if (IS_ERR(str)) { |
| 558 | err = PTR_ERR(str); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 559 | goto exit_free; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 560 | } |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 561 | err = audit_make_tree(&entry->rule, str, f->op); |
| 562 | kfree(str); |
| 563 | if (err) |
| 564 | goto exit_free; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 565 | entry->rule.buflen += f_val; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 566 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 567 | case AUDIT_INODE: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 568 | f->val = f_val; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 569 | err = audit_to_inode(&entry->rule, f); |
| 570 | if (err) |
| 571 | goto exit_free; |
| 572 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 573 | case AUDIT_FILTERKEY: |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 574 | if (entry->rule.filterkey || f_val > AUDIT_MAX_KEY_LEN) |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 575 | goto exit_free; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 576 | str = audit_unpack_string(&bufp, &remain, f_val); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 577 | if (IS_ERR(str)) { |
| 578 | err = PTR_ERR(str); |
| 579 | goto exit_free; |
| 580 | } |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 581 | entry->rule.buflen += f_val; |
| 582 | entry->rule.filterkey = str; |
| 583 | break; |
| 584 | case AUDIT_EXE: |
| 585 | if (entry->rule.exe || f_val > PATH_MAX) |
| 586 | goto exit_free; |
| 587 | str = audit_unpack_string(&bufp, &remain, f_val); |
| 588 | if (IS_ERR(str)) { |
| 589 | err = PTR_ERR(str); |
| 590 | goto exit_free; |
| 591 | } |
| 592 | audit_mark = audit_alloc_mark(&entry->rule, str, f_val); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 593 | if (IS_ERR(audit_mark)) { |
| 594 | kfree(str); |
| 595 | err = PTR_ERR(audit_mark); |
| 596 | goto exit_free; |
| 597 | } |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 598 | entry->rule.buflen += f_val; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 599 | entry->rule.exe = audit_mark; |
| 600 | break; |
Paul Moore | 2ad3e17 | 2020-02-22 20:36:47 -0500 | [diff] [blame] | 601 | default: |
| 602 | f->val = f_val; |
| 603 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 604 | } |
| 605 | } |
| 606 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 607 | if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal) |
| 608 | entry->rule.inode_f = NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 609 | |
| 610 | exit_nofree: |
| 611 | return entry; |
| 612 | |
| 613 | exit_free: |
Chen Gang | 373e0f3 | 2013-04-29 15:05:18 -0700 | [diff] [blame] | 614 | if (entry->rule.tree) |
| 615 | audit_put_tree(entry->rule.tree); /* that's the temporary one */ |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 616 | if (entry->rule.exe) |
| 617 | audit_remove_mark(entry->rule.exe); /* that's the template one */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 618 | audit_free_rule(entry); |
| 619 | return ERR_PTR(err); |
| 620 | } |
| 621 | |
| 622 | /* Pack a filter field's string representation into data block. */ |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 623 | static inline size_t audit_pack_string(void **bufp, const char *str) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 624 | { |
| 625 | size_t len = strlen(str); |
| 626 | |
| 627 | memcpy(*bufp, str, len); |
| 628 | *bufp += len; |
| 629 | |
| 630 | return len; |
| 631 | } |
| 632 | |
Wei Yuan | fd97646 | 2016-02-06 15:39:47 +0800 | [diff] [blame] | 633 | /* Translate kernel rule representation to struct audit_rule_data. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 634 | static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) |
| 635 | { |
| 636 | struct audit_rule_data *data; |
| 637 | void *bufp; |
| 638 | int i; |
| 639 | |
Xiu Jianfeng | bc6e60a | 2021-12-14 19:48:54 +0800 | [diff] [blame] | 640 | data = kmalloc(struct_size(data, buf, krule->buflen), GFP_KERNEL); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 641 | if (unlikely(!data)) |
Amy Griffis | 0a3b483 | 2006-05-02 15:06:01 -0400 | [diff] [blame] | 642 | return NULL; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 643 | memset(data, 0, sizeof(*data)); |
| 644 | |
| 645 | data->flags = krule->flags | krule->listnr; |
| 646 | data->action = krule->action; |
| 647 | data->field_count = krule->field_count; |
| 648 | bufp = data->buf; |
| 649 | for (i = 0; i < data->field_count; i++) { |
| 650 | struct audit_field *f = &krule->fields[i]; |
| 651 | |
| 652 | data->fields[i] = f->type; |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 653 | data->fieldflags[i] = audit_ops[f->op]; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 654 | switch(f->type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 655 | case AUDIT_SUBJ_USER: |
| 656 | case AUDIT_SUBJ_ROLE: |
| 657 | case AUDIT_SUBJ_TYPE: |
| 658 | case AUDIT_SUBJ_SEN: |
| 659 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 660 | case AUDIT_OBJ_USER: |
| 661 | case AUDIT_OBJ_ROLE: |
| 662 | case AUDIT_OBJ_TYPE: |
| 663 | case AUDIT_OBJ_LEV_LOW: |
| 664 | case AUDIT_OBJ_LEV_HIGH: |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 665 | data->buflen += data->values[i] = |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 666 | audit_pack_string(&bufp, f->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 667 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 668 | case AUDIT_WATCH: |
| 669 | data->buflen += data->values[i] = |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 670 | audit_pack_string(&bufp, |
| 671 | audit_watch_path(krule->watch)); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 672 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 673 | case AUDIT_DIR: |
| 674 | data->buflen += data->values[i] = |
| 675 | audit_pack_string(&bufp, |
| 676 | audit_tree_path(krule->tree)); |
| 677 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 678 | case AUDIT_FILTERKEY: |
| 679 | data->buflen += data->values[i] = |
| 680 | audit_pack_string(&bufp, krule->filterkey); |
| 681 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 682 | case AUDIT_EXE: |
| 683 | data->buflen += data->values[i] = |
| 684 | audit_pack_string(&bufp, audit_mark_path(krule->exe)); |
| 685 | break; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 686 | case AUDIT_LOGINUID_SET: |
| 687 | if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { |
| 688 | data->fields[i] = AUDIT_LOGINUID; |
| 689 | data->values[i] = AUDIT_UID_UNSET; |
| 690 | break; |
| 691 | } |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 692 | fallthrough; /* if set */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 693 | default: |
| 694 | data->values[i] = f->val; |
| 695 | } |
| 696 | } |
| 697 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i]; |
| 698 | |
| 699 | return data; |
| 700 | } |
| 701 | |
| 702 | /* Compare two rules in kernel format. Considered success if rules |
| 703 | * don't match. */ |
| 704 | 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] | 705 | { |
| 706 | int i; |
| 707 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 708 | if (a->flags != b->flags || |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 709 | a->pflags != b->pflags || |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 710 | a->listnr != b->listnr || |
| 711 | a->action != b->action || |
| 712 | a->field_count != b->field_count) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 713 | return 1; |
| 714 | |
| 715 | for (i = 0; i < a->field_count; i++) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 716 | if (a->fields[i].type != b->fields[i].type || |
| 717 | a->fields[i].op != b->fields[i].op) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 718 | return 1; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 719 | |
| 720 | switch(a->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 721 | case AUDIT_SUBJ_USER: |
| 722 | case AUDIT_SUBJ_ROLE: |
| 723 | case AUDIT_SUBJ_TYPE: |
| 724 | case AUDIT_SUBJ_SEN: |
| 725 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 726 | case AUDIT_OBJ_USER: |
| 727 | case AUDIT_OBJ_ROLE: |
| 728 | case AUDIT_OBJ_TYPE: |
| 729 | case AUDIT_OBJ_LEV_LOW: |
| 730 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 731 | if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 732 | return 1; |
| 733 | break; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 734 | case AUDIT_WATCH: |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 735 | if (strcmp(audit_watch_path(a->watch), |
| 736 | audit_watch_path(b->watch))) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 737 | return 1; |
| 738 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 739 | case AUDIT_DIR: |
| 740 | if (strcmp(audit_tree_path(a->tree), |
| 741 | audit_tree_path(b->tree))) |
| 742 | return 1; |
| 743 | break; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 744 | case AUDIT_FILTERKEY: |
| 745 | /* both filterkeys exist based on above type compare */ |
| 746 | if (strcmp(a->filterkey, b->filterkey)) |
| 747 | return 1; |
| 748 | break; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 749 | case AUDIT_EXE: |
| 750 | /* both paths exist based on above type compare */ |
| 751 | if (strcmp(audit_mark_path(a->exe), |
| 752 | audit_mark_path(b->exe))) |
| 753 | return 1; |
| 754 | break; |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 755 | case AUDIT_UID: |
| 756 | case AUDIT_EUID: |
| 757 | case AUDIT_SUID: |
| 758 | case AUDIT_FSUID: |
| 759 | case AUDIT_LOGINUID: |
| 760 | case AUDIT_OBJ_UID: |
| 761 | if (!uid_eq(a->fields[i].uid, b->fields[i].uid)) |
| 762 | return 1; |
| 763 | break; |
| 764 | case AUDIT_GID: |
| 765 | case AUDIT_EGID: |
| 766 | case AUDIT_SGID: |
| 767 | case AUDIT_FSGID: |
| 768 | case AUDIT_OBJ_GID: |
| 769 | if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) |
| 770 | return 1; |
| 771 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 772 | default: |
| 773 | if (a->fields[i].val != b->fields[i].val) |
| 774 | return 1; |
| 775 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 779 | if (a->mask[i] != b->mask[i]) |
| 780 | return 1; |
| 781 | |
| 782 | return 0; |
| 783 | } |
| 784 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 785 | /* Duplicate LSM field information. The lsm_rule is opaque, so must be |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 786 | * re-initialized. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 787 | static inline int audit_dupe_lsm_field(struct audit_field *df, |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 788 | struct audit_field *sf) |
| 789 | { |
| 790 | int ret = 0; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 791 | char *lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 792 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 793 | /* our own copy of lsm_str */ |
| 794 | lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); |
| 795 | if (unlikely(!lsm_str)) |
Akinobu Mita | 3e1fbd1 | 2006-12-22 01:10:02 -0800 | [diff] [blame] | 796 | return -ENOMEM; |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 797 | df->lsm_str = lsm_str; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 798 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 799 | /* our own (refreshed) copy of lsm_rule */ |
| 800 | ret = security_audit_rule_init(df->type, df->op, df->lsm_str, |
| 801 | (void **)&df->lsm_rule); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 802 | /* Keep currently invalid fields around in case they |
| 803 | * become valid after a policy reload. */ |
| 804 | if (ret == -EINVAL) { |
Richard Guy Briggs | f952d10 | 2014-01-27 17:38:42 -0500 | [diff] [blame] | 805 | pr_warn("audit rule for LSM \'%s\' is invalid\n", |
| 806 | df->lsm_str); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 807 | ret = 0; |
| 808 | } |
| 809 | |
| 810 | return ret; |
| 811 | } |
| 812 | |
| 813 | /* 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] | 814 | * of the watch - that pointer is carried over. The LSM specific fields |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 815 | * 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] | 816 | * rule with the new rule in the filterlist, then free the old rule. |
| 817 | * The rlist element is undefined; list manipulations are handled apart from |
| 818 | * the initial copy. */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 819 | struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 820 | { |
| 821 | u32 fcount = old->field_count; |
| 822 | struct audit_entry *entry; |
| 823 | struct audit_krule *new; |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 824 | char *fk; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 825 | int i, err = 0; |
| 826 | |
| 827 | entry = audit_init_entry(fcount); |
| 828 | if (unlikely(!entry)) |
| 829 | return ERR_PTR(-ENOMEM); |
| 830 | |
| 831 | new = &entry->rule; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 832 | new->flags = old->flags; |
Richard Guy Briggs | 041d7b9 | 2014-12-23 13:02:04 -0500 | [diff] [blame] | 833 | new->pflags = old->pflags; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 834 | new->listnr = old->listnr; |
| 835 | new->action = old->action; |
| 836 | for (i = 0; i < AUDIT_BITMASK_SIZE; i++) |
| 837 | new->mask[i] = old->mask[i]; |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 838 | new->prio = old->prio; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 839 | new->buflen = old->buflen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 840 | new->inode_f = old->inode_f; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 841 | new->field_count = old->field_count; |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 842 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 843 | /* |
| 844 | * note that we are OK with not refcounting here; audit_match_tree() |
| 845 | * never dereferences tree and we can't get false positives there |
| 846 | * since we'd have to have rule gone from the list *and* removed |
| 847 | * before the chunks found by lookup had been allocated, i.e. before |
| 848 | * the beginning of list scan. |
| 849 | */ |
| 850 | new->tree = old->tree; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 851 | memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
| 852 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 853 | /* deep copy this information, updating the lsm_rule fields, because |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 854 | * the originals will all be freed when the old rule is freed. */ |
| 855 | for (i = 0; i < fcount; i++) { |
| 856 | switch (new->fields[i].type) { |
Darrel Goeddel | 3a6b9f8 | 2006-06-29 16:56:39 -0500 | [diff] [blame] | 857 | case AUDIT_SUBJ_USER: |
| 858 | case AUDIT_SUBJ_ROLE: |
| 859 | case AUDIT_SUBJ_TYPE: |
| 860 | case AUDIT_SUBJ_SEN: |
| 861 | case AUDIT_SUBJ_CLR: |
Darrel Goeddel | 6e5a2d1 | 2006-06-29 16:57:08 -0500 | [diff] [blame] | 862 | case AUDIT_OBJ_USER: |
| 863 | case AUDIT_OBJ_ROLE: |
| 864 | case AUDIT_OBJ_TYPE: |
| 865 | case AUDIT_OBJ_LEV_LOW: |
| 866 | case AUDIT_OBJ_LEV_HIGH: |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 867 | err = audit_dupe_lsm_field(&new->fields[i], |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 868 | &old->fields[i]); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 869 | break; |
| 870 | case AUDIT_FILTERKEY: |
| 871 | fk = kstrdup(old->filterkey, GFP_KERNEL); |
| 872 | if (unlikely(!fk)) |
| 873 | err = -ENOMEM; |
| 874 | else |
| 875 | new->filterkey = fk; |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 876 | break; |
| 877 | case AUDIT_EXE: |
| 878 | err = audit_dupe_exe(new, old); |
| 879 | break; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 880 | } |
| 881 | if (err) { |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 882 | if (new->exe) |
| 883 | audit_remove_mark(new->exe); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 884 | audit_free_rule(entry); |
| 885 | return ERR_PTR(err); |
| 886 | } |
| 887 | } |
| 888 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 889 | if (old->watch) { |
| 890 | audit_get_watch(old->watch); |
| 891 | new->watch = old->watch; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 892 | } |
| 893 | |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 894 | return entry; |
| 895 | } |
| 896 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 897 | /* Find an existing audit rule. |
| 898 | * Caller must hold audit_filter_mutex to prevent stale rule data. */ |
| 899 | static struct audit_entry *audit_find_rule(struct audit_entry *entry, |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 900 | struct list_head **p) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 901 | { |
| 902 | struct audit_entry *e, *found = NULL; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 903 | struct list_head *list; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 904 | int h; |
| 905 | |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 906 | if (entry->rule.inode_f) { |
| 907 | h = audit_hash_ino(entry->rule.inode_f->val); |
| 908 | *p = list = &audit_inode_hash[h]; |
| 909 | } else if (entry->rule.watch) { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 910 | /* we don't know the inode number, so must walk entire hash */ |
| 911 | for (h = 0; h < AUDIT_INODE_BUCKETS; h++) { |
| 912 | list = &audit_inode_hash[h]; |
| 913 | list_for_each_entry(e, list, list) |
| 914 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 915 | found = e; |
| 916 | goto out; |
| 917 | } |
| 918 | } |
| 919 | goto out; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 920 | } else { |
| 921 | *p = list = &audit_filter_list[entry->rule.listnr]; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 922 | } |
| 923 | |
| 924 | list_for_each_entry(e, list, list) |
| 925 | if (!audit_compare_rule(&entry->rule, &e->rule)) { |
| 926 | found = e; |
| 927 | goto out; |
| 928 | } |
| 929 | |
| 930 | out: |
| 931 | return found; |
| 932 | } |
| 933 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 934 | static u64 prio_low = ~0ULL/2; |
| 935 | static u64 prio_high = ~0ULL/2 - 1; |
| 936 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 937 | /* Add rule to given filterlist if not a duplicate. */ |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 938 | static inline int audit_add_rule(struct audit_entry *entry) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 939 | { |
| 940 | struct audit_entry *e; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 941 | struct audit_watch *watch = entry->rule.watch; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 942 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 943 | struct list_head *list; |
Paul Moore | ae9d2fb | 2015-08-05 11:19:45 -0400 | [diff] [blame] | 944 | int err = 0; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 945 | #ifdef CONFIG_AUDITSYSCALL |
| 946 | int dont_count = 0; |
| 947 | |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 948 | /* If any of these, don't count towards total */ |
| 949 | switch(entry->rule.listnr) { |
| 950 | case AUDIT_FILTER_USER: |
Richard Guy Briggs | d904ac0 | 2018-06-05 11:45:07 -0400 | [diff] [blame] | 951 | case AUDIT_FILTER_EXCLUDE: |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 952 | case AUDIT_FILTER_FS: |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 953 | dont_count = 1; |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 954 | } |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 955 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 956 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 957 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 958 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 959 | if (e) { |
Eric Paris | 35fe4d0 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 960 | mutex_unlock(&audit_filter_mutex); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 961 | err = -EEXIST; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 962 | /* normally audit_add_tree_rule() will free it on failure */ |
| 963 | if (tree) |
| 964 | audit_put_tree(tree); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 965 | return err; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 966 | } |
| 967 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 968 | if (watch) { |
| 969 | /* audit_filter_mutex is dropped and re-taken during this call */ |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 970 | err = audit_add_watch(&entry->rule, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 971 | if (err) { |
| 972 | mutex_unlock(&audit_filter_mutex); |
Chen Gang | 2f992ee | 2013-07-08 15:59:38 -0700 | [diff] [blame] | 973 | /* |
| 974 | * normally audit_add_tree_rule() will free it |
| 975 | * on failure |
| 976 | */ |
| 977 | if (tree) |
| 978 | audit_put_tree(tree); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 979 | return err; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 980 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 981 | } |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 982 | if (tree) { |
| 983 | err = audit_add_tree_rule(&entry->rule); |
| 984 | if (err) { |
| 985 | mutex_unlock(&audit_filter_mutex); |
Richard Guy Briggs | f8259b2 | 2015-08-01 15:41:12 -0400 | [diff] [blame] | 986 | return err; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 987 | } |
| 988 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 989 | |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 990 | entry->rule.prio = ~0ULL; |
Paul Moore | 67daf27 | 2021-04-18 21:54:47 -0400 | [diff] [blame] | 991 | if (entry->rule.listnr == AUDIT_FILTER_EXIT || |
| 992 | entry->rule.listnr == AUDIT_FILTER_URING_EXIT) { |
Al Viro | 0590b93 | 2008-12-14 23:45:27 -0500 | [diff] [blame] | 993 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) |
| 994 | entry->rule.prio = ++prio_high; |
| 995 | else |
| 996 | entry->rule.prio = --prio_low; |
| 997 | } |
| 998 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 999 | if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1000 | list_add(&entry->rule.list, |
| 1001 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1002 | list_add_rcu(&entry->list, list); |
Amy Griffis | 6a2bcee | 2006-06-02 13:16:01 -0400 | [diff] [blame] | 1003 | entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1004 | } else { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1005 | list_add_tail(&entry->rule.list, |
| 1006 | &audit_rules_list[entry->rule.listnr]); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1007 | list_add_tail_rcu(&entry->list, list); |
| 1008 | } |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1009 | #ifdef CONFIG_AUDITSYSCALL |
| 1010 | if (!dont_count) |
| 1011 | audit_n_rules++; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 1012 | |
| 1013 | if (!audit_match_signal(entry)) |
| 1014 | audit_signals++; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1015 | #endif |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1016 | mutex_unlock(&audit_filter_mutex); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1017 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1018 | return err; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1019 | } |
| 1020 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1021 | /* Remove an existing rule from filterlist. */ |
Richard Guy Briggs | 7f49294 | 2015-08-05 16:29:36 -0400 | [diff] [blame] | 1022 | int audit_del_rule(struct audit_entry *entry) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1023 | { |
| 1024 | struct audit_entry *e; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1025 | struct audit_tree *tree = entry->rule.tree; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1026 | struct list_head *list; |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1027 | int ret = 0; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1028 | #ifdef CONFIG_AUDITSYSCALL |
| 1029 | int dont_count = 0; |
| 1030 | |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 1031 | /* If any of these, don't count towards total */ |
| 1032 | switch(entry->rule.listnr) { |
| 1033 | case AUDIT_FILTER_USER: |
Richard Guy Briggs | d904ac0 | 2018-06-05 11:45:07 -0400 | [diff] [blame] | 1034 | case AUDIT_FILTER_EXCLUDE: |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 1035 | case AUDIT_FILTER_FS: |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1036 | dont_count = 1; |
Richard Guy Briggs | 42d5e37 | 2017-08-23 07:03:39 -0400 | [diff] [blame] | 1037 | } |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1038 | #endif |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1039 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1040 | mutex_lock(&audit_filter_mutex); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1041 | e = audit_find_rule(entry, &list); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1042 | if (!e) { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1043 | ret = -ENOENT; |
| 1044 | goto out; |
| 1045 | } |
| 1046 | |
Eric Paris | cfcad62 | 2009-06-11 14:31:36 -0400 | [diff] [blame] | 1047 | if (e->rule.watch) |
Eric Paris | a05fb6c | 2009-12-17 20:12:05 -0500 | [diff] [blame] | 1048 | audit_remove_watch_rule(&e->rule); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1049 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1050 | if (e->rule.tree) |
| 1051 | audit_remove_tree_rule(&e->rule); |
| 1052 | |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1053 | if (e->rule.exe) |
| 1054 | audit_remove_mark_rule(&e->rule); |
| 1055 | |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1056 | #ifdef CONFIG_AUDITSYSCALL |
| 1057 | if (!dont_count) |
| 1058 | audit_n_rules--; |
Amy Griffis | e54dc24 | 2007-03-29 18:01:04 -0400 | [diff] [blame] | 1059 | |
| 1060 | if (!audit_match_signal(entry)) |
| 1061 | audit_signals--; |
Al Viro | 471a5c7 | 2006-07-10 08:29:24 -0400 | [diff] [blame] | 1062 | #endif |
Richard Guy Briggs | 8c85fc9 | 2015-08-05 15:23:09 -0400 | [diff] [blame] | 1063 | |
| 1064 | list_del_rcu(&e->list); |
| 1065 | list_del(&e->rule.list); |
| 1066 | call_rcu(&e->rcu, audit_free_rule_rcu); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1067 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1068 | out: |
Richard Guy Briggs | 8c85fc9 | 2015-08-05 15:23:09 -0400 | [diff] [blame] | 1069 | mutex_unlock(&audit_filter_mutex); |
| 1070 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1071 | if (tree) |
| 1072 | audit_put_tree(tree); /* that's the temporary one */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1073 | |
| 1074 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1075 | } |
| 1076 | |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1077 | /* List rules using struct audit_rule_data. */ |
Paul Moore | 45a0642 | 2017-05-02 10:16:05 -0400 | [diff] [blame] | 1078 | static void audit_list_rules(int seq, struct sk_buff_head *q) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1079 | { |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1080 | struct sk_buff *skb; |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1081 | struct audit_krule *r; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1082 | int i; |
| 1083 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1084 | /* This is a blocking read, so use audit_filter_mutex instead of rcu |
| 1085 | * iterator to sync with list writers. */ |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1086 | for (i=0; i<AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1087 | list_for_each_entry(r, &audit_rules_list[i], list) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1088 | struct audit_rule_data *data; |
| 1089 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1090 | data = audit_krule_to_data(r); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1091 | if (unlikely(!data)) |
| 1092 | break; |
Paul Moore | 45a0642 | 2017-05-02 10:16:05 -0400 | [diff] [blame] | 1093 | skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1, |
| 1094 | data, |
Xiu Jianfeng | 30561b5 | 2021-12-17 09:01:51 +0800 | [diff] [blame] | 1095 | struct_size(data, buf, data->buflen)); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1096 | if (skb) |
| 1097 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1098 | kfree(data); |
| 1099 | } |
| 1100 | } |
Paul Moore | 45a0642 | 2017-05-02 10:16:05 -0400 | [diff] [blame] | 1101 | skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 1102 | if (skb) |
| 1103 | skb_queue_tail(q, skb); |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1104 | } |
| 1105 | |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1106 | /* Log rule additions and removals */ |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1107 | 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] | 1108 | { |
| 1109 | struct audit_buffer *ab; |
| 1110 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 1111 | if (!audit_enabled) |
| 1112 | return; |
| 1113 | |
Richard Guy Briggs | 626abcd | 2019-01-18 17:42:48 -0500 | [diff] [blame] | 1114 | ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1115 | if (!ab) |
| 1116 | return; |
Richard Guy Briggs | 5c5b8d8 | 2018-05-17 22:01:48 -0400 | [diff] [blame] | 1117 | audit_log_session_info(ab); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 1118 | audit_log_task_context(ab); |
Steve Grubb | c1e8f06 | 2016-11-16 16:14:33 -0500 | [diff] [blame] | 1119 | audit_log_format(ab, " op=%s", action); |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1120 | audit_log_key(ab, rule->filterkey); |
Amy Griffis | 5adc8a6 | 2006-06-14 18:45:21 -0400 | [diff] [blame] | 1121 | audit_log_format(ab, " list=%d res=%d", rule->listnr, res); |
| 1122 | audit_log_end(ab); |
| 1123 | } |
| 1124 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1125 | /** |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1126 | * audit_rule_change - apply all rules to the specified message type |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1127 | * @type: audit message type |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1128 | * @seq: netlink audit message sequence (serial) number |
| 1129 | * @data: payload data |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1130 | * @datasz: size of payload data |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1131 | */ |
Paul Moore | 45a0642 | 2017-05-02 10:16:05 -0400 | [diff] [blame] | 1132 | int audit_rule_change(int type, int seq, void *data, size_t datasz) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1133 | { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1134 | int err = 0; |
| 1135 | struct audit_entry *entry; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1136 | |
| 1137 | switch (type) { |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1138 | case AUDIT_ADD_RULE: |
Wenwen Wang | 70c4cf1 | 2019-04-19 20:49:29 -0500 | [diff] [blame] | 1139 | entry = audit_data_to_entry(data, datasz); |
| 1140 | if (IS_ERR(entry)) |
| 1141 | return PTR_ERR(entry); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1142 | err = audit_add_rule(entry); |
Burn Alting | e7df61f | 2014-04-04 16:00:38 +1100 | [diff] [blame] | 1143 | audit_log_rule_change("add_rule", &entry->rule, !err); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1144 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1145 | case AUDIT_DEL_RULE: |
Wenwen Wang | 70c4cf1 | 2019-04-19 20:49:29 -0500 | [diff] [blame] | 1146 | entry = audit_data_to_entry(data, datasz); |
| 1147 | if (IS_ERR(entry)) |
| 1148 | return PTR_ERR(entry); |
Al Viro | 36c4f1b1 | 2008-12-15 01:50:28 -0500 | [diff] [blame] | 1149 | err = audit_del_rule(entry); |
Burn Alting | e7df61f | 2014-04-04 16:00:38 +1100 | [diff] [blame] | 1150 | audit_log_rule_change("remove_rule", &entry->rule, !err); |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1151 | break; |
| 1152 | default: |
Eric Paris | 739c950 | 2014-10-10 15:05:21 -0400 | [diff] [blame] | 1153 | WARN_ON(1); |
Wenwen Wang | 70c4cf1 | 2019-04-19 20:49:29 -0500 | [diff] [blame] | 1154 | return -EINVAL; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1155 | } |
| 1156 | |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1157 | if (err || type == AUDIT_DEL_RULE) { |
| 1158 | if (entry->rule.exe) |
| 1159 | audit_remove_mark(entry->rule.exe); |
Richard Guy Briggs | e85322d | 2014-10-02 22:05:19 -0400 | [diff] [blame] | 1160 | audit_free_rule(entry); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1161 | } |
Richard Guy Briggs | e85322d | 2014-10-02 22:05:19 -0400 | [diff] [blame] | 1162 | |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1163 | return err; |
| 1164 | } |
| 1165 | |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1166 | /** |
| 1167 | * audit_list_rules_send - list the audit rules |
Eric W. Biederman | d211f177 | 2014-03-08 15:31:54 -0800 | [diff] [blame] | 1168 | * @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] | 1169 | * @seq: netlink audit message sequence (serial) number |
| 1170 | */ |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1171 | 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] | 1172 | { |
| 1173 | struct task_struct *tsk; |
| 1174 | struct audit_netlink_list *dest; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1175 | |
| 1176 | /* We can't just spew out the rules here because we might fill |
| 1177 | * the available socket buffer space and deadlock waiting for |
| 1178 | * auditctl to read from it... which isn't ever going to |
| 1179 | * happen if we're actually running in the context of auditctl |
| 1180 | * trying to _send_ the stuff */ |
| 1181 | |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1182 | dest = kmalloc(sizeof(*dest), GFP_KERNEL); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1183 | if (!dest) |
| 1184 | return -ENOMEM; |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1185 | dest->net = get_net(sock_net(NETLINK_CB(request_skb).sk)); |
| 1186 | dest->portid = NETLINK_CB(request_skb).portid; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1187 | skb_queue_head_init(&dest->q); |
| 1188 | |
| 1189 | mutex_lock(&audit_filter_mutex); |
Paul Moore | 45a0642 | 2017-05-02 10:16:05 -0400 | [diff] [blame] | 1190 | audit_list_rules(seq, &dest->q); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1191 | mutex_unlock(&audit_filter_mutex); |
| 1192 | |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1193 | tsk = kthread_run(audit_send_list_thread, dest, "audit_send_list"); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1194 | if (IS_ERR(tsk)) { |
| 1195 | skb_queue_purge(&dest->q); |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1196 | put_net(dest->net); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1197 | kfree(dest); |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1198 | return PTR_ERR(tsk); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1199 | } |
| 1200 | |
Paul Moore | 3054d06 | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 1201 | return 0; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1202 | } |
| 1203 | |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1204 | int audit_comparator(u32 left, u32 op, u32 right) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1205 | { |
| 1206 | switch (op) { |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1207 | case Audit_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1208 | return (left == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1209 | case Audit_not_equal: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1210 | return (left != right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1211 | case Audit_lt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1212 | return (left < right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1213 | case Audit_le: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1214 | return (left <= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1215 | case Audit_gt: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1216 | return (left > right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1217 | case Audit_ge: |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1218 | return (left >= right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1219 | case Audit_bitmask: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1220 | return (left & right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1221 | case Audit_bittest: |
Eric Paris | 74f2345 | 2007-06-04 17:00:14 -0400 | [diff] [blame] | 1222 | return ((left & right) == right); |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1223 | default: |
Al Viro | 5af75d8 | 2008-12-16 05:59:26 -0500 | [diff] [blame] | 1224 | return 0; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1225 | } |
| 1226 | } |
| 1227 | |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1228 | int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) |
| 1229 | { |
| 1230 | switch (op) { |
| 1231 | case Audit_equal: |
| 1232 | return uid_eq(left, right); |
| 1233 | case Audit_not_equal: |
| 1234 | return !uid_eq(left, right); |
| 1235 | case Audit_lt: |
| 1236 | return uid_lt(left, right); |
| 1237 | case Audit_le: |
| 1238 | return uid_lte(left, right); |
| 1239 | case Audit_gt: |
| 1240 | return uid_gt(left, right); |
| 1241 | case Audit_ge: |
| 1242 | return uid_gte(left, right); |
| 1243 | case Audit_bitmask: |
| 1244 | case Audit_bittest: |
| 1245 | default: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1246 | return 0; |
| 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | int audit_gid_comparator(kgid_t left, u32 op, kgid_t right) |
| 1251 | { |
| 1252 | switch (op) { |
| 1253 | case Audit_equal: |
| 1254 | return gid_eq(left, right); |
| 1255 | case Audit_not_equal: |
| 1256 | return !gid_eq(left, right); |
| 1257 | case Audit_lt: |
| 1258 | return gid_lt(left, right); |
| 1259 | case Audit_le: |
| 1260 | return gid_lte(left, right); |
| 1261 | case Audit_gt: |
| 1262 | return gid_gt(left, right); |
| 1263 | case Audit_ge: |
| 1264 | return gid_gte(left, right); |
| 1265 | case Audit_bitmask: |
| 1266 | case Audit_bittest: |
| 1267 | default: |
Eric W. Biederman | ca57ec0 | 2012-09-11 02:18:08 -0700 | [diff] [blame] | 1268 | return 0; |
| 1269 | } |
| 1270 | } |
| 1271 | |
Jeff Layton | bfcec70 | 2012-10-10 15:25:23 -0400 | [diff] [blame] | 1272 | /** |
| 1273 | * parent_len - find the length of the parent portion of a pathname |
| 1274 | * @path: pathname of which to determine length |
| 1275 | */ |
| 1276 | int parent_len(const char *path) |
| 1277 | { |
| 1278 | int plen; |
| 1279 | const char *p; |
| 1280 | |
| 1281 | plen = strlen(path); |
| 1282 | |
| 1283 | if (plen == 0) |
| 1284 | return plen; |
| 1285 | |
| 1286 | /* disregard trailing slashes */ |
| 1287 | p = path + plen - 1; |
| 1288 | while ((*p == '/') && (p > path)) |
| 1289 | p--; |
| 1290 | |
| 1291 | /* walk backward until we find the next slash or hit beginning */ |
| 1292 | while ((*p != '/') && (p > path)) |
| 1293 | p--; |
| 1294 | |
| 1295 | /* did we find a slash? Then increment to include it in path */ |
| 1296 | if (*p == '/') |
| 1297 | p++; |
| 1298 | |
| 1299 | return p - path; |
| 1300 | } |
| 1301 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1302 | /** |
| 1303 | * audit_compare_dname_path - compare given dentry name with last component in |
| 1304 | * given path. Return of 0 indicates a match. |
| 1305 | * @dname: dentry name that we're comparing |
| 1306 | * @path: full pathname that we're comparing |
| 1307 | * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL |
| 1308 | * here indicates that we must compute this value. |
| 1309 | */ |
Al Viro | 795d673 | 2019-04-26 14:11:05 -0400 | [diff] [blame] | 1310 | int audit_compare_dname_path(const struct qstr *dname, const char *path, int parentlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1311 | { |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1312 | int dlen, pathlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1313 | const char *p; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1314 | |
Al Viro | 795d673 | 2019-04-26 14:11:05 -0400 | [diff] [blame] | 1315 | dlen = dname->len; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1316 | pathlen = strlen(path); |
| 1317 | if (pathlen < dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1318 | return 1; |
| 1319 | |
Jeff Layton | e3d6b07 | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 1320 | parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1321 | if (pathlen - parentlen != dlen) |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1322 | return 1; |
Eric Paris | 29e9a34 | 2012-10-10 15:25:24 -0400 | [diff] [blame] | 1323 | |
| 1324 | p = path + parentlen; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1325 | |
Al Viro | 795d673 | 2019-04-26 14:11:05 -0400 | [diff] [blame] | 1326 | return strncmp(p, dname->name, dlen); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1327 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1328 | |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1329 | int audit_filter(int msgtype, unsigned int listtype) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1330 | { |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1331 | struct audit_entry *e; |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1332 | int ret = 1; /* Audit by default */ |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1333 | |
| 1334 | rcu_read_lock(); |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1335 | list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) { |
| 1336 | int i, result = 0; |
| 1337 | |
| 1338 | for (i = 0; i < e->rule.field_count; i++) { |
| 1339 | struct audit_field *f = &e->rule.fields[i]; |
| 1340 | pid_t pid; |
| 1341 | u32 sid; |
| 1342 | |
| 1343 | switch (f->type) { |
| 1344 | case AUDIT_PID: |
| 1345 | pid = task_pid_nr(current); |
| 1346 | result = audit_comparator(pid, f->op, f->val); |
| 1347 | break; |
| 1348 | case AUDIT_UID: |
| 1349 | result = audit_uid_comparator(current_uid(), f->op, f->uid); |
| 1350 | break; |
| 1351 | case AUDIT_GID: |
| 1352 | result = audit_gid_comparator(current_gid(), f->op, f->gid); |
| 1353 | break; |
| 1354 | case AUDIT_LOGINUID: |
| 1355 | result = audit_uid_comparator(audit_get_loginuid(current), |
| 1356 | f->op, f->uid); |
| 1357 | break; |
| 1358 | case AUDIT_LOGINUID_SET: |
| 1359 | result = audit_comparator(audit_loginuid_set(current), |
| 1360 | f->op, f->val); |
| 1361 | break; |
| 1362 | case AUDIT_MSGTYPE: |
| 1363 | result = audit_comparator(msgtype, f->op, f->val); |
| 1364 | break; |
| 1365 | case AUDIT_SUBJ_USER: |
| 1366 | case AUDIT_SUBJ_ROLE: |
| 1367 | case AUDIT_SUBJ_TYPE: |
| 1368 | case AUDIT_SUBJ_SEN: |
| 1369 | case AUDIT_SUBJ_CLR: |
| 1370 | if (f->lsm_rule) { |
Paul Moore | 6326948 | 2021-09-29 11:01:21 -0400 | [diff] [blame] | 1371 | security_current_getsecid_subj(&sid); |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1372 | result = security_audit_rule_match(sid, |
Richard Guy Briggs | 90462a5 | 2019-01-31 11:52:11 -0500 | [diff] [blame] | 1373 | f->type, f->op, f->lsm_rule); |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1374 | } |
| 1375 | break; |
Ondrej Mosnáček | 29c1372 | 2018-05-30 10:45:24 +0200 | [diff] [blame] | 1376 | case AUDIT_EXE: |
| 1377 | result = audit_exe_compare(current, e->rule.exe); |
| 1378 | if (f->op == Audit_not_equal) |
| 1379 | result = !result; |
| 1380 | break; |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1381 | default: |
| 1382 | goto unlock_and_return; |
| 1383 | } |
| 1384 | if (result < 0) /* error */ |
| 1385 | goto unlock_and_return; |
| 1386 | if (!result) |
| 1387 | break; |
| 1388 | } |
| 1389 | if (result > 0) { |
Richard Guy Briggs | d904ac0 | 2018-06-05 11:45:07 -0400 | [diff] [blame] | 1390 | if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_EXCLUDE) |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1391 | ret = 0; |
| 1392 | break; |
| 1393 | } |
| 1394 | } |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1395 | unlock_and_return: |
| 1396 | rcu_read_unlock(); |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1397 | return ret; |
David Woodhouse | fe7752b | 2005-12-15 18:33:52 +0000 | [diff] [blame] | 1398 | } |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1399 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1400 | static int update_lsm_rule(struct audit_krule *r) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1401 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1402 | struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1403 | struct audit_entry *nentry; |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1404 | int err = 0; |
| 1405 | |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1406 | if (!security_audit_rule_known(r)) |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1407 | return 0; |
| 1408 | |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1409 | nentry = audit_dupe_rule(r); |
Richard Guy Briggs | 34d99af5 | 2015-08-05 16:29:37 -0400 | [diff] [blame] | 1410 | if (entry->rule.exe) |
| 1411 | audit_remove_mark(entry->rule.exe); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1412 | if (IS_ERR(nentry)) { |
| 1413 | /* save the first error encountered for the |
| 1414 | * return value */ |
| 1415 | err = PTR_ERR(nentry); |
| 1416 | audit_panic("error updating LSM filters"); |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1417 | if (r->watch) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1418 | list_del(&r->rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1419 | list_del_rcu(&entry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1420 | list_del(&r->list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1421 | } else { |
Eric Paris | ae7b8f4 | 2009-12-17 20:12:04 -0500 | [diff] [blame] | 1422 | if (r->watch || r->tree) |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1423 | list_replace_init(&r->rlist, &nentry->rule.rlist); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1424 | list_replace_rcu(&entry->list, &nentry->list); |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1425 | list_replace(&r->list, &nentry->rule.list); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1426 | } |
| 1427 | call_rcu(&entry->rcu, audit_free_rule_rcu); |
| 1428 | |
| 1429 | return err; |
| 1430 | } |
| 1431 | |
Ahmed S. Darwish | 04305e4 | 2008-04-19 09:59:43 +1000 | [diff] [blame] | 1432 | /* 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] | 1433 | * It will traverse the filter lists serarching for rules that contain LSM |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1434 | * 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] | 1435 | * 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] | 1436 | * updated rule. */ |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 1437 | int audit_update_lsm_rules(void) |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1438 | { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1439 | struct audit_krule *r, *n; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1440 | int i, err = 0; |
| 1441 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1442 | /* audit_filter_mutex synchronizes the writers */ |
| 1443 | mutex_lock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1444 | |
| 1445 | for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
Al Viro | e45aa21 | 2008-12-15 01:17:50 -0500 | [diff] [blame] | 1446 | list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { |
| 1447 | int res = update_lsm_rule(r); |
Al Viro | 1a9d0797 | 2008-12-14 12:04:02 -0500 | [diff] [blame] | 1448 | if (!err) |
| 1449 | err = res; |
| 1450 | } |
| 1451 | } |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1452 | mutex_unlock(&audit_filter_mutex); |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1453 | |
| 1454 | return err; |
| 1455 | } |