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 <faith@redhat.com> 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 #define AUDIT_OFF 0 119 #define AUDIT_ON 1 120 #define AUDIT_LOCKED 2 121 #ifdef CONFIG_AUDIT 122 /* These are defined in audit.c */ 123 /* Public API */ 124 extern __printf(4, 5) 125 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, 126 const char *fmt, ...); 127 128 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type); 129 extern __printf(2, 3) 130 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...); 131 extern void audit_log_end(struct audit_buffer *ab); 132 extern bool audit_string_contains_control(const char *string, 133 size_t len); 134 extern void audit_log_n_hex(struct audit_buffer *ab, 135 const unsigned char *buf, 136 size_t len); 137 extern void audit_log_n_string(struct audit_buffer *ab, 138 const char *buf, 139 size_t n); 140 extern void audit_log_n_untrustedstring(struct audit_buffer *ab, 141 const char *string, 142 size_t n); 143 extern void audit_log_untrustedstring(struct audit_buffer *ab, 144 const char *string); 145 extern void audit_log_d_path(struct audit_buffer *ab, 146 const char *prefix, 147 const struct path *path); 148 extern void audit_log_key(struct audit_buffer *ab, 149 char *key); 150 extern void audit_log_link_denied(const char *operation); 151 extern void audit_log_lost(const char *message); 152 153 extern int audit_log_task_context(struct audit_buffer *ab); 154 extern void audit_log_task_info(struct audit_buffer *ab); 155 156 extern int audit_update_lsm_rules(void); 157 158 /* Private API (for audit.c only) */ 159 extern int audit_rule_change(int type, int seq, void *data, size_t datasz); 160 extern int audit_list_rules_send(struct sk_buff *request_skb, int seq); 161 162 extern u32 audit_enabled; 163 #else /* CONFIG_AUDIT */ 164 static inline __printf(4, 5) 165 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, 166 const char *fmt, ...) 167 { } 168 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx, 169 gfp_t gfp_mask, int type) 170 { 171 return NULL; 172 } 173 static inline __printf(2, 3) 174 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) 175 { } 176 static inline void audit_log_end(struct audit_buffer *ab) 177 { } 178 static inline void audit_log_n_hex(struct audit_buffer *ab, 179 const unsigned char *buf, size_t len) 180 { } 181 static inline void audit_log_n_string(struct audit_buffer *ab, 182 const char *buf, size_t n) 183 { } 184 static inline void audit_log_n_untrustedstring(struct audit_buffer *ab, 185 const char *string, size_t n) 186 { } 187 static inline void audit_log_untrustedstring(struct audit_buffer *ab, 188 const char *string) 189 { } 190 static inline void audit_log_d_path(struct audit_buffer *ab, 191 const char *prefix, 192 const struct path *path) 193 { } 194 static inline void audit_log_key(struct audit_buffer *ab, char *key) 195 { } 196 static inline void audit_log_link_denied(const char *string) 197 { } 198 static inline int audit_log_task_context(struct audit_buffer *ab) 199 { 200 return 0; 201 } 202 static inline void audit_log_task_info(struct audit_buffer *ab) 203 { } 204 #define audit_enabled AUDIT_OFF 205 #endif /* CONFIG_AUDIT */ 206 207 #ifdef CONFIG_AUDIT_COMPAT_GENERIC 208 #define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT)) 209 #else 210 #define audit_is_compat(arch) false 211 #endif 212 213 #ifdef CONFIG_AUDITSYSCALL 214 #include <asm/syscall.h> /* for syscall_get_arch() */ 215 216 /* These are defined in auditsc.c */ 217 /* Public API */ 218 extern int audit_alloc(struct task_struct *task); 219 extern void __audit_free(struct task_struct *task); 220 extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, 221 unsigned long a2, unsigned long a3); 222 extern void __audit_syscall_exit(int ret_success, long ret_value); 223 extern struct filename *__audit_reusename(const __user char *uptr); 224 extern void __audit_getname(struct filename *name); 225 226 #define AUDIT_INODE_PARENT 1 /* dentry represents the parent */ 227 #define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */ 228 extern void __audit_inode(struct filename *name, const struct dentry *dentry, 229 unsigned int flags); 230 extern void __audit_file(const struct file *); 231 extern void __audit_inode_child(struct inode *parent, 232 const struct dentry *dentry, 233 const unsigned char type); 234 extern void audit_seccomp(unsigned long syscall, long signr, int code); 235 extern void audit_seccomp_actions_logged(const char *names, 236 const char *old_names, int res); 237 extern void __audit_ptrace(struct task_struct *t); 238 239 static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx) 240 { 241 task->audit_context = ctx; 242 } 243 244 static inline struct audit_context *audit_context(void) 245 { 246 return current->audit_context; 247 } 248 249 static inline bool audit_dummy_context(void) 250 { 251 void *p = 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(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(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_ptrace(struct task_struct *t) 317 { 318 if (unlikely(!audit_dummy_context())) 319 __audit_ptrace(t); 320 } 321 322 /* Private API (for audit.c only) */ 323 extern unsigned int audit_serial(void); 324 extern int auditsc_get_stamp(struct audit_context *ctx, 325 struct timespec64 *t, unsigned int *serial); 326 extern int audit_set_loginuid(kuid_t loginuid); 327 328 static inline kuid_t audit_get_loginuid(struct task_struct *tsk) 329 { 330 return tsk->loginuid; 331 } 332 333 static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 334 { 335 return tsk->sessionid; 336 } 337 338 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp); 339 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode); 340 extern void __audit_bprm(struct linux_binprm *bprm); 341 extern int __audit_socketcall(int nargs, unsigned long *args); 342 extern int __audit_sockaddr(int len, void *addr); 343 extern void __audit_fd_pair(int fd1, int fd2); 344 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr); 345 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout); 346 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification); 347 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat); 348 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm, 349 const struct cred *new, 350 const struct cred *old); 351 extern void __audit_log_capset(const struct cred *new, const struct cred *old); 352 extern void __audit_mmap_fd(int fd, int flags); 353 extern void __audit_log_kern_module(char *name); 354 extern void __audit_fanotify(unsigned int response); 355 356 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp) 357 { 358 if (unlikely(!audit_dummy_context())) 359 __audit_ipc_obj(ipcp); 360 } 361 static inline void audit_fd_pair(int fd1, int fd2) 362 { 363 if (unlikely(!audit_dummy_context())) 364 __audit_fd_pair(fd1, fd2); 365 } 366 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode) 367 { 368 if (unlikely(!audit_dummy_context())) 369 __audit_ipc_set_perm(qbytes, uid, gid, mode); 370 } 371 static inline void audit_bprm(struct linux_binprm *bprm) 372 { 373 if (unlikely(!audit_dummy_context())) 374 __audit_bprm(bprm); 375 } 376 static inline int audit_socketcall(int nargs, unsigned long *args) 377 { 378 if (unlikely(!audit_dummy_context())) 379 return __audit_socketcall(nargs, args); 380 return 0; 381 } 382 383 static inline int audit_socketcall_compat(int nargs, u32 *args) 384 { 385 unsigned long a[AUDITSC_ARGS]; 386 int i; 387 388 if (audit_dummy_context()) 389 return 0; 390 391 for (i = 0; i < nargs; i++) 392 a[i] = (unsigned long)args[i]; 393 return __audit_socketcall(nargs, a); 394 } 395 396 static inline int audit_sockaddr(int len, void *addr) 397 { 398 if (unlikely(!audit_dummy_context())) 399 return __audit_sockaddr(len, addr); 400 return 0; 401 } 402 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) 403 { 404 if (unlikely(!audit_dummy_context())) 405 __audit_mq_open(oflag, mode, attr); 406 } 407 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout) 408 { 409 if (unlikely(!audit_dummy_context())) 410 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout); 411 } 412 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification) 413 { 414 if (unlikely(!audit_dummy_context())) 415 __audit_mq_notify(mqdes, notification); 416 } 417 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) 418 { 419 if (unlikely(!audit_dummy_context())) 420 __audit_mq_getsetattr(mqdes, mqstat); 421 } 422 423 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm, 424 const struct cred *new, 425 const struct cred *old) 426 { 427 if (unlikely(!audit_dummy_context())) 428 return __audit_log_bprm_fcaps(bprm, new, old); 429 return 0; 430 } 431 432 static inline void audit_log_capset(const struct cred *new, 433 const struct cred *old) 434 { 435 if (unlikely(!audit_dummy_context())) 436 __audit_log_capset(new, old); 437 } 438 439 static inline void audit_mmap_fd(int fd, int flags) 440 { 441 if (unlikely(!audit_dummy_context())) 442 __audit_mmap_fd(fd, flags); 443 } 444 445 static inline void audit_log_kern_module(char *name) 446 { 447 if (!audit_dummy_context()) 448 __audit_log_kern_module(name); 449 } 450 451 static inline void audit_fanotify(unsigned int response) 452 { 453 if (!audit_dummy_context()) 454 __audit_fanotify(response); 455 } 456 457 extern int audit_n_rules; 458 extern int audit_signals; 459 #else /* CONFIG_AUDITSYSCALL */ 460 static inline int audit_alloc(struct task_struct *task) 461 { 462 return 0; 463 } 464 static inline void audit_free(struct task_struct *task) 465 { } 466 static inline void audit_syscall_entry(int major, unsigned long a0, 467 unsigned long a1, unsigned long a2, 468 unsigned long a3) 469 { } 470 static inline void audit_syscall_exit(void *pt_regs) 471 { } 472 static inline bool audit_dummy_context(void) 473 { 474 return true; 475 } 476 static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx) 477 { } 478 static inline struct audit_context *audit_context(void) 479 { 480 return NULL; 481 } 482 static inline struct filename *audit_reusename(const __user char *name) 483 { 484 return NULL; 485 } 486 static inline void audit_getname(struct filename *name) 487 { } 488 static inline void __audit_inode(struct filename *name, 489 const struct dentry *dentry, 490 unsigned int flags) 491 { } 492 static inline void __audit_inode_child(struct inode *parent, 493 const struct dentry *dentry, 494 const unsigned char type) 495 { } 496 static inline void audit_inode(struct filename *name, 497 const struct dentry *dentry, 498 unsigned int parent) 499 { } 500 static inline void audit_file(struct file *file) 501 { 502 } 503 static inline void audit_inode_parent_hidden(struct filename *name, 504 const struct dentry *dentry) 505 { } 506 static inline void audit_inode_child(struct inode *parent, 507 const struct dentry *dentry, 508 const unsigned char type) 509 { } 510 static inline void audit_core_dumps(long signr) 511 { } 512 static inline void audit_seccomp(unsigned long syscall, long signr, int code) 513 { } 514 static inline void audit_seccomp_actions_logged(const char *names, 515 const char *old_names, int res) 516 { } 517 static inline int auditsc_get_stamp(struct audit_context *ctx, 518 struct timespec64 *t, unsigned int *serial) 519 { 520 return 0; 521 } 522 static inline kuid_t audit_get_loginuid(struct task_struct *tsk) 523 { 524 return INVALID_UID; 525 } 526 static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 527 { 528 return AUDIT_SID_UNSET; 529 } 530 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp) 531 { } 532 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, 533 gid_t gid, umode_t mode) 534 { } 535 static inline void audit_bprm(struct linux_binprm *bprm) 536 { } 537 static inline int audit_socketcall(int nargs, unsigned long *args) 538 { 539 return 0; 540 } 541 542 static inline int audit_socketcall_compat(int nargs, u32 *args) 543 { 544 return 0; 545 } 546 547 static inline void audit_fd_pair(int fd1, int fd2) 548 { } 549 static inline int audit_sockaddr(int len, void *addr) 550 { 551 return 0; 552 } 553 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr) 554 { } 555 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, 556 unsigned int msg_prio, 557 const struct timespec64 *abs_timeout) 558 { } 559 static inline void audit_mq_notify(mqd_t mqdes, 560 const struct sigevent *notification) 561 { } 562 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) 563 { } 564 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm, 565 const struct cred *new, 566 const struct cred *old) 567 { 568 return 0; 569 } 570 static inline void audit_log_capset(const struct cred *new, 571 const struct cred *old) 572 { } 573 static inline void audit_mmap_fd(int fd, int flags) 574 { } 575 576 static inline void audit_log_kern_module(char *name) 577 { 578 } 579 580 static inline void audit_fanotify(unsigned int response) 581 { } 582 583 static inline void audit_ptrace(struct task_struct *t) 584 { } 585 #define audit_n_rules 0 586 #define audit_signals 0 587 #endif /* CONFIG_AUDITSYSCALL */ 588 589 static inline bool audit_loginuid_set(struct task_struct *tsk) 590 { 591 return uid_valid(audit_get_loginuid(tsk)); 592 } 593 594 static inline void audit_log_string(struct audit_buffer *ab, const char *buf) 595 { 596 audit_log_n_string(ab, buf, strlen(buf)); 597 } 598 599 #endif 600