1 /* audit.h -- Auditing support 2 * 3 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. 4 * All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * Written by Rickard E. (Rik) Faith <[email protected]> 21 * 22 */ 23 #ifndef _LINUX_AUDIT_H_ 24 #define _LINUX_AUDIT_H_ 25 26 #include <linux/sched.h> 27 #include <linux/ptrace.h> 28 #include <uapi/linux/audit.h> 29 30 #define AUDIT_INO_UNSET ((unsigned long)-1) 31 #define AUDIT_DEV_UNSET ((dev_t)-1) 32 33 struct audit_sig_info { 34 uid_t uid; 35 pid_t pid; 36 char ctx[0]; 37 }; 38 39 struct audit_buffer; 40 struct audit_context; 41 struct inode; 42 struct netlink_skb_parms; 43 struct path; 44 struct linux_binprm; 45 struct mq_attr; 46 struct mqstat; 47 struct audit_watch; 48 struct audit_tree; 49 struct sk_buff; 50 51 struct audit_krule { 52 u32 pflags; 53 u32 flags; 54 u32 listnr; 55 u32 action; 56 u32 mask[AUDIT_BITMASK_SIZE]; 57 u32 buflen; /* for data alloc on list rules */ 58 u32 field_count; 59 char *filterkey; /* ties events to rules */ 60 struct audit_field *fields; 61 struct audit_field *arch_f; /* quick access to arch field */ 62 struct audit_field *inode_f; /* quick access to an inode field */ 63 struct audit_watch *watch; /* associated watch */ 64 struct audit_tree *tree; /* associated watched tree */ 65 struct audit_fsnotify_mark *exe; 66 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */ 67 struct list_head list; /* for AUDIT_LIST* purposes only */ 68 u64 prio; 69 }; 70 71 /* Flag to indicate legacy AUDIT_LOGINUID unset usage */ 72 #define AUDIT_LOGINUID_LEGACY 0x1 73 74 struct audit_field { 75 u32 type; 76 union { 77 u32 val; 78 kuid_t uid; 79 kgid_t gid; 80 struct { 81 char *lsm_str; 82 void *lsm_rule; 83 }; 84 }; 85 u32 op; 86 }; 87 88 extern int is_audit_feature_set(int which); 89 90 extern int __init audit_register_class(int class, unsigned *list); 91 extern int audit_classify_syscall(int abi, unsigned syscall); 92 extern int audit_classify_arch(int arch); 93 /* only for compat system calls */ 94 extern unsigned compat_write_class[]; 95 extern unsigned compat_read_class[]; 96 extern unsigned compat_dir_class[]; 97 extern unsigned compat_chattr_class[]; 98 extern unsigned compat_signal_class[]; 99 100 extern int audit_classify_compat_syscall(int abi, unsigned syscall); 101 102 /* audit_names->type values */ 103 #define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */ 104 #define AUDIT_TYPE_NORMAL 1 /* a "normal" audit record */ 105 #define AUDIT_TYPE_PARENT 2 /* a parent audit record */ 106 #define AUDIT_TYPE_CHILD_DELETE 3 /* a child being deleted */ 107 #define AUDIT_TYPE_CHILD_CREATE 4 /* a child being created */ 108 109 /* maximized args number that audit_socketcall can process */ 110 #define AUDITSC_ARGS 6 111 112 /* bit values for ->signal->audit_tty */ 113 #define AUDIT_TTY_ENABLE BIT(0) 114 #define AUDIT_TTY_LOG_PASSWD BIT(1) 115 116 struct filename; 117 118 extern void audit_log_session_info(struct audit_buffer *ab); 119 120 #ifdef CONFIG_AUDIT 121 /* These are defined in audit.c */ 122 /* Public API */ 123 extern __printf(4, 5) 124 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, 125 const char *fmt, ...); 126 127 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type); 128 extern __printf(2, 3) 129 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...); 130 extern void audit_log_end(struct audit_buffer *ab); 131 extern bool audit_string_contains_control(const char *string, 132 size_t len); 133 extern void audit_log_n_hex(struct audit_buffer *ab, 134 const unsigned char *buf, 135 size_t len); 136 extern void audit_log_n_string(struct audit_buffer *ab, 137 const char *buf, 138 size_t n); 139 extern void audit_log_n_untrustedstring(struct audit_buffer *ab, 140 const char *string, 141 size_t n); 142 extern void audit_log_untrustedstring(struct audit_buffer *ab, 143 const char *string); 144 extern void audit_log_d_path(struct audit_buffer *ab, 145 const char *prefix, 146 const struct path *path); 147 extern void audit_log_key(struct audit_buffer *ab, 148 char *key); 149 extern void audit_log_link_denied(const char *operation, 150 const struct path *link); 151 extern void audit_log_lost(const char *message); 152 #ifdef CONFIG_SECURITY 153 extern void audit_log_secctx(struct audit_buffer *ab, u32 secid); 154 #else 155 static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid) 156 { } 157 #endif 158 159 extern int audit_log_task_context(struct audit_buffer *ab); 160 extern void audit_log_task_info(struct audit_buffer *ab, 161 struct task_struct *tsk); 162 163 extern int audit_update_lsm_rules(void); 164 165 /* Private API (for audit.c only) */ 166 extern int audit_rule_change(int type, __u32 portid, int seq, 167 void *data, size_t datasz); 168 extern int audit_list_rules_send(struct sk_buff *request_skb, int seq); 169 170 extern u32 audit_enabled; 171 #else /* CONFIG_AUDIT */ 172 static inline __printf(4, 5) 173 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, 174 const char *fmt, ...) 175 { } 176 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx, 177 gfp_t gfp_mask, int type) 178 { 179 return NULL; 180 } 181 static inline __printf(2, 3) 182 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) 183 { } 184 static inline void audit_log_end(struct audit_buffer *ab) 185 { } 186 static inline void audit_log_n_hex(struct audit_buffer *ab, 187 const unsigned char *buf, size_t len) 188 { } 189 static inline void audit_log_n_string(struct audit_buffer *ab, 190 const char *buf, size_t n) 191 { } 192 static inline void audit_log_n_untrustedstring(struct audit_buffer *ab, 193 const char *string, size_t n) 194 { } 195 static inline void audit_log_untrustedstring(struct audit_buffer *ab, 196 const char *string) 197 { } 198 static inline void audit_log_d_path(struct audit_buffer *ab, 199 const char *prefix, 200 const struct path *path) 201 { } 202 static inline void audit_log_key(struct audit_buffer *ab, char *key) 203 { } 204 static inline void audit_log_link_denied(const char *string, 205 const struct path *link) 206 { } 207 static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid) 208 { } 209 static inline int audit_log_task_context(struct audit_buffer *ab) 210 { 211 return 0; 212 } 213 static inline void audit_log_task_info(struct audit_buffer *ab, 214 struct task_struct *tsk) 215 { } 216 #define audit_enabled 0 217 #endif /* CONFIG_AUDIT */ 218 219 #ifdef CONFIG_AUDIT_COMPAT_GENERIC 220 #define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT)) 221 #else 222 #define audit_is_compat(arch) false 223 #endif 224 225 #ifdef CONFIG_AUDITSYSCALL 226 #include <asm/syscall.h> /* for syscall_get_arch() */ 227 228 /* These are defined in auditsc.c */ 229 /* Public API */ 230 extern int audit_alloc(struct task_struct *task); 231 extern void __audit_free(struct task_struct *task); 232 extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, 233 unsigned long a2, unsigned long a3); 234 extern void __audit_syscall_exit(int ret_success, long ret_value); 235 extern struct filename *__audit_reusename(const __user char *uptr); 236 extern void __audit_getname(struct filename *name); 237 238 #define AUDIT_INODE_PARENT 1 /* dentry represents the parent */ 239 #define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */ 240 extern void __audit_inode(struct filename *name, const struct dentry *dentry, 241 unsigned int flags); 242 extern void __audit_file(const struct file *); 243 extern void __audit_inode_child(struct inode *parent, 244 const struct dentry *dentry, 245 const unsigned char type); 246 extern void __audit_seccomp(unsigned long syscall, long signr, int code); 247 extern void __audit_ptrace(struct task_struct *t); 248 249 static inline bool audit_dummy_context(void) 250 { 251 void *p = current->audit_context; 252 return !p || *(int *)p; 253 } 254 static inline void audit_free(struct task_struct *task) 255 { 256 if (unlikely(task->audit_context)) 257 __audit_free(task); 258 } 259 static inline void audit_syscall_entry(int major, unsigned long a0, 260 unsigned long a1, unsigned long a2, 261 unsigned long a3) 262 { 263 if (unlikely(current->audit_context)) 264 __audit_syscall_entry(major, a0, a1, a2, a3); 265 } 266 static inline void audit_syscall_exit(void *pt_regs) 267 { 268 if (unlikely(current->audit_context)) { 269 int success = is_syscall_success(pt_regs); 270 long return_code = regs_return_value(pt_regs); 271 272 __audit_syscall_exit(success, return_code); 273 } 274 } 275 static inline struct filename *audit_reusename(const __user char *name) 276 { 277 if (unlikely(!audit_dummy_context())) 278 return __audit_reusename(name); 279 return NULL; 280 } 281 static inline void audit_getname(struct filename *name) 282 { 283 if (unlikely(!audit_dummy_context())) 284 __audit_getname(name); 285 } 286 static inline void audit_inode(struct filename *name, 287 const struct dentry *dentry, 288 unsigned int parent) { 289 if (unlikely(!audit_dummy_context())) { 290 unsigned int flags = 0; 291 if (parent) 292 flags |= AUDIT_INODE_PARENT; 293 __audit_inode(name, dentry, flags); 294 } 295 } 296 static inline void audit_file(struct file *file) 297 { 298 if (unlikely(!audit_dummy_context())) 299 __audit_file(file); 300 } 301 static inline void audit_inode_parent_hidden(struct filename *name, 302 const struct dentry *dentry) 303 { 304 if (unlikely(!audit_dummy_context())) 305 __audit_inode(name, dentry, 306 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN); 307 } 308 static inline void audit_inode_child(struct inode *parent, 309 const struct dentry *dentry, 310 const unsigned char type) { 311 if (unlikely(!audit_dummy_context())) 312 __audit_inode_child(parent, dentry, type); 313 } 314 void audit_core_dumps(long signr); 315 316 static inline void audit_seccomp(unsigned long syscall, long signr, int code) 317 { 318 if (!audit_enabled) 319 return; 320 321 /* Force a record to be reported if a signal was delivered. */ 322 if (signr || unlikely(!audit_dummy_context())) 323 __audit_seccomp(syscall, signr, code); 324 } 325 326 static inline void audit_ptrace(struct task_struct *t) 327 { 328 if (unlikely(!audit_dummy_context())) 329 __audit_ptrace(t); 330 } 331 332 /* Private API (for audit.c only) */ 333 extern unsigned int audit_serial(void); 334 extern int auditsc_get_stamp(struct audit_context *ctx, 335 struct timespec *t, unsigned int *serial); 336 extern int audit_set_loginuid(kuid_t loginuid); 337 338 static inline kuid_t audit_get_loginuid(struct task_struct *tsk) 339 { 340 return tsk->loginuid; 341 } 342 343 static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 344 { 345 return tsk->sessionid; 346 } 347 348 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp); 349 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode); 350 extern void __audit_bprm(struct linux_binprm *bprm); 351 extern int __audit_socketcall(int nargs, unsigned long *args); 352 extern int __audit_sockaddr(int len, void *addr); 353 extern void __audit_fd_pair(int fd1, int fd2); 354 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr); 355 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout); 356 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification); 357 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat); 358 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm, 359 const struct cred *new, 360 const struct cred *old); 361 extern void __audit_log_capset(const struct cred *new, const struct cred *old); 362 extern void __audit_mmap_fd(int fd, int flags); 363 extern void __audit_log_kern_module(char *name); 364 365 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp) 366 { 367 if (unlikely(!audit_dummy_context())) 368 __audit_ipc_obj(ipcp); 369 } 370 static inline void audit_fd_pair(int fd1, int fd2) 371 { 372 if (unlikely(!audit_dummy_context())) 373 __audit_fd_pair(fd1, fd2); 374 } 375 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) 376 { 377 if (unlikely(!audit_dummy_context())) 378 __audit_ipc_set_perm(qbytes, uid, gid, mode); 379 } 380 static inline void audit_bprm(struct linux_binprm *bprm) 381 { 382 if (unlikely(!audit_dummy_context())) 383 __audit_bprm(bprm); 384 } 385 static inline int audit_socketcall(int nargs, unsigned long *args) 386 { 387 if (unlikely(!audit_dummy_context())) 388 return __audit_socketcall(nargs, args); 389 return 0; 390 } 391 392 static inline int audit_socketcall_compat(int nargs, u32 *args) 393 { 394 unsigned long a[AUDITSC_ARGS]; 395 int i; 396 397 if (audit_dummy_context()) 398 return 0; 399 400 for (i = 0; i < nargs; i++) 401 a[i] = (unsigned long)args[i]; 402 return __audit_socketcall(nargs, a); 403 } 404 405 static inline int audit_sockaddr(int len, void *addr) 406 { 407 if (unlikely(!audit_dummy_context())) 408 return __audit_sockaddr(len, addr); 409 return 0; 410 } 411 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) 412 { 413 if (unlikely(!audit_dummy_context())) 414 __audit_mq_open(oflag, mode, attr); 415 } 416 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout) 417 { 418 if (unlikely(!audit_dummy_context())) 419 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout); 420 } 421 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) 422 { 423 if (unlikely(!audit_dummy_context())) 424 __audit_mq_notify(mqdes, notification); 425 } 426 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) 427 { 428 if (unlikely(!audit_dummy_context())) 429 __audit_mq_getsetattr(mqdes, mqstat); 430 } 431 432 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm, 433 const struct cred *new, 434 const struct cred *old) 435 { 436 if (unlikely(!audit_dummy_context())) 437 return __audit_log_bprm_fcaps(bprm, new, old); 438 return 0; 439 } 440 441 static inline void audit_log_capset(const struct cred *new, 442 const struct cred *old) 443 { 444 if (unlikely(!audit_dummy_context())) 445 __audit_log_capset(new, old); 446 } 447 448 static inline void audit_mmap_fd(int fd, int flags) 449 { 450 if (unlikely(!audit_dummy_context())) 451 __audit_mmap_fd(fd, flags); 452 } 453 454 static inline void audit_log_kern_module(char *name) 455 { 456 if (!audit_dummy_context()) 457 __audit_log_kern_module(name); 458 } 459 460 extern int audit_n_rules; 461 extern int audit_signals; 462 #else /* CONFIG_AUDITSYSCALL */ 463 static inline int audit_alloc(struct task_struct *task) 464 { 465 return 0; 466 } 467 static inline void audit_free(struct task_struct *task) 468 { } 469 static inline void audit_syscall_entry(int major, unsigned long a0, 470 unsigned long a1, unsigned long a2, 471 unsigned long a3) 472 { } 473 static inline void audit_syscall_exit(void *pt_regs) 474 { } 475 static inline bool audit_dummy_context(void) 476 { 477 return true; 478 } 479 static inline struct filename *audit_reusename(const __user char *name) 480 { 481 return NULL; 482 } 483 static inline void audit_getname(struct filename *name) 484 { } 485 static inline void __audit_inode(struct filename *name, 486 const struct dentry *dentry, 487 unsigned int flags) 488 { } 489 static inline void __audit_inode_child(struct inode *parent, 490 const struct dentry *dentry, 491 const unsigned char type) 492 { } 493 static inline void audit_inode(struct filename *name, 494 const struct dentry *dentry, 495 unsigned int parent) 496 { } 497 static inline void audit_file(struct file *file) 498 { 499 } 500 static inline void audit_inode_parent_hidden(struct filename *name, 501 const struct dentry *dentry) 502 { } 503 static inline void audit_inode_child(struct inode *parent, 504 const struct dentry *dentry, 505 const unsigned char type) 506 { } 507 static inline void audit_core_dumps(long signr) 508 { } 509 static inline void __audit_seccomp(unsigned long syscall, long signr, int code) 510 { } 511 static inline void audit_seccomp(unsigned long syscall, long signr, int code) 512 { } 513 static inline int auditsc_get_stamp(struct audit_context *ctx, 514 struct timespec *t, unsigned int *serial) 515 { 516 return 0; 517 } 518 static inline kuid_t audit_get_loginuid(struct task_struct *tsk) 519 { 520 return INVALID_UID; 521 } 522 static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 523 { 524 return -1; 525 } 526 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp) 527 { } 528 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, 529 gid_t gid, umode_t mode) 530 { } 531 static inline void audit_bprm(struct linux_binprm *bprm) 532 { } 533 static inline int audit_socketcall(int nargs, unsigned long *args) 534 { 535 return 0; 536 } 537 538 static inline int audit_socketcall_compat(int nargs, u32 *args) 539 { 540 return 0; 541 } 542 543 static inline void audit_fd_pair(int fd1, int fd2) 544 { } 545 static inline int audit_sockaddr(int len, void *addr) 546 { 547 return 0; 548 } 549 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) 550 { } 551 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, 552 unsigned int msg_prio, 553 const struct timespec *abs_timeout) 554 { } 555 static inline void audit_mq_notify(mqd_t mqdes, 556 const struct sigevent *notification) 557 { } 558 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) 559 { } 560 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm, 561 const struct cred *new, 562 const struct cred *old) 563 { 564 return 0; 565 } 566 static inline void audit_log_capset(const struct cred *new, 567 const struct cred *old) 568 { } 569 static inline void audit_mmap_fd(int fd, int flags) 570 { } 571 572 static inline void audit_log_kern_module(char *name) 573 { 574 } 575 576 static inline void audit_ptrace(struct task_struct *t) 577 { } 578 #define audit_n_rules 0 579 #define audit_signals 0 580 #endif /* CONFIG_AUDITSYSCALL */ 581 582 static inline bool audit_loginuid_set(struct task_struct *tsk) 583 { 584 return uid_valid(audit_get_loginuid(tsk)); 585 } 586 587 static inline void audit_log_string(struct audit_buffer *ab, const char *buf) 588 { 589 audit_log_n_string(ab, buf, strlen(buf)); 590 } 591 592 #endif 593