include/linux/audit.h

   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 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, int seq, void *data, size_t datasz);
 167 extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
 168
 169 extern u32 audit_enabled;
 170 #else /* CONFIG_AUDIT */
 171 static inline __printf(4, 5)
 172 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 173                const char *fmt, ...)
 174 { }
 175 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
 176                                                    gfp_t gfp_mask, int type)
 177 {
 178         return NULL;
 179 }
 180 static inline __printf(2, 3)
 181 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
 182 { }
 183 static inline void audit_log_end(struct audit_buffer *ab)
 184 { }
 185 static inline void audit_log_n_hex(struct audit_buffer *ab,
 186                                    const unsigned char *buf, size_t len)
 187 { }
 188 static inline void audit_log_n_string(struct audit_buffer *ab,
 189                                       const char *buf, size_t n)
 190 { }
 191 static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
 192                                                 const char *string, size_t n)
 193 { }
 194 static inline void audit_log_untrustedstring(struct audit_buffer *ab,
 195                                              const char *string)
 196 { }
 197 static inline void audit_log_d_path(struct audit_buffer *ab,
 198                                     const char *prefix,
 199                                     const struct path *path)
 200 { }
 201 static inline void audit_log_key(struct audit_buffer *ab, char *key)
 202 { }
 203 static inline void audit_log_link_denied(const char *string,
 204                                          const struct path *link)
 205 { }
 206 static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
 207 { }
 208 static inline int audit_log_task_context(struct audit_buffer *ab)
 209 {
 210         return 0;
 211 }
 212 static inline void audit_log_task_info(struct audit_buffer *ab,
 213                                        struct task_struct *tsk)
 214 { }
 215 #define audit_enabled 0
 216 #endif /* CONFIG_AUDIT */
 217
 218 #ifdef CONFIG_AUDIT_COMPAT_GENERIC
 219 #define audit_is_compat(arch)  (!((arch) & __AUDIT_ARCH_64BIT))
 220 #else
 221 #define audit_is_compat(arch)  false
 222 #endif
 223
 224 #ifdef CONFIG_AUDITSYSCALL
 225 #include <asm/syscall.h> /* for syscall_get_arch() */
 226
 227 /* These are defined in auditsc.c */
 228                                 /* Public API */
 229 extern int  audit_alloc(struct task_struct *task);
 230 extern void __audit_free(struct task_struct *task);
 231 extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
 232                                   unsigned long a2, unsigned long a3);
 233 extern void __audit_syscall_exit(int ret_success, long ret_value);
 234 extern struct filename *__audit_reusename(const __user char *uptr);
 235 extern void __audit_getname(struct filename *name);
 236
 237 #define AUDIT_INODE_PARENT      1       /* dentry represents the parent */
 238 #define AUDIT_INODE_HIDDEN      2       /* audit record should be hidden */
 239 extern void __audit_inode(struct filename *name, const struct dentry *dentry,
 240                                 unsigned int flags);
 241 extern void __audit_file(const struct file *);
 242 extern void __audit_inode_child(struct inode *parent,
 243                                 const struct dentry *dentry,
 244                                 const unsigned char type);
 245 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 246 extern void __audit_ptrace(struct task_struct *t);
 247
 248 static inline bool audit_dummy_context(void)
 249 {
 250         void *p = current->audit_context;
 251         return !p || *(int *)p;
 252 }
 253 static inline void audit_free(struct task_struct *task)
 254 {
 255         if (unlikely(task->audit_context))
 256                 __audit_free(task);
 257 }
 258 static inline void audit_syscall_entry(int major, unsigned long a0,
 259                                        unsigned long a1, unsigned long a2,
 260                                        unsigned long a3)
 261 {
 262         if (unlikely(current->audit_context))
 263                 __audit_syscall_entry(major, a0, a1, a2, a3);
 264 }
 265 static inline void audit_syscall_exit(void *pt_regs)
 266 {
 267         if (unlikely(current->audit_context)) {
 268                 int success = is_syscall_success(pt_regs);
 269                 long return_code = regs_return_value(pt_regs);
 270
 271                 __audit_syscall_exit(success, return_code);
 272         }
 273 }
 274 static inline struct filename *audit_reusename(const __user char *name)
 275 {
 276         if (unlikely(!audit_dummy_context()))
 277                 return __audit_reusename(name);
 278         return NULL;
 279 }
 280 static inline void audit_getname(struct filename *name)
 281 {
 282         if (unlikely(!audit_dummy_context()))
 283                 __audit_getname(name);
 284 }
 285 static inline void audit_inode(struct filename *name,
 286                                 const struct dentry *dentry,
 287                                 unsigned int parent) {
 288         if (unlikely(!audit_dummy_context())) {
 289                 unsigned int flags = 0;
 290                 if (parent)
 291                         flags |= AUDIT_INODE_PARENT;
 292                 __audit_inode(name, dentry, flags);
 293         }
 294 }
 295 static inline void audit_file(struct file *file)
 296 {
 297         if (unlikely(!audit_dummy_context()))
 298                 __audit_file(file);
 299 }
 300 static inline void audit_inode_parent_hidden(struct filename *name,
 301                                                 const struct dentry *dentry)
 302 {
 303         if (unlikely(!audit_dummy_context()))
 304                 __audit_inode(name, dentry,
 305                                 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
 306 }
 307 static inline void audit_inode_child(struct inode *parent,
 308                                      const struct dentry *dentry,
 309                                      const unsigned char type) {
 310         if (unlikely(!audit_dummy_context()))
 311                 __audit_inode_child(parent, dentry, type);
 312 }
 313 void audit_core_dumps(long signr);
 314
 315 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 316 {
 317         if (!audit_enabled)
 318                 return;
 319
 320         /* Force a record to be reported if a signal was delivered. */
 321         if (signr || unlikely(!audit_dummy_context()))
 322                 __audit_seccomp(syscall, signr, code);
 323 }
 324
 325 static inline void audit_ptrace(struct task_struct *t)
 326 {
 327         if (unlikely(!audit_dummy_context()))
 328                 __audit_ptrace(t);
 329 }
 330
 331                                 /* Private API (for audit.c only) */
 332 extern unsigned int audit_serial(void);
 333 extern int auditsc_get_stamp(struct audit_context *ctx,
 334                               struct timespec64 *t, unsigned int *serial);
 335 extern int audit_set_loginuid(kuid_t loginuid);
 336
 337 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 338 {
 339         return tsk->loginuid;
 340 }
 341
 342 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 343 {
 344         return tsk->sessionid;
 345 }
 346
 347 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 348 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 349 extern void __audit_bprm(struct linux_binprm *bprm);
 350 extern int __audit_socketcall(int nargs, unsigned long *args);
 351 extern int __audit_sockaddr(int len, void *addr);
 352 extern void __audit_fd_pair(int fd1, int fd2);
 353 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 354 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
 355 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 356 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 357 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 358                                   const struct cred *new,
 359                                   const struct cred *old);
 360 extern void __audit_log_capset(const struct cred *new, const struct cred *old);
 361 extern void __audit_mmap_fd(int fd, int flags);
 362 extern void __audit_log_kern_module(char *name);
 363
 364 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 365 {
 366         if (unlikely(!audit_dummy_context()))
 367                 __audit_ipc_obj(ipcp);
 368 }
 369 static inline void audit_fd_pair(int fd1, int fd2)
 370 {
 371         if (unlikely(!audit_dummy_context()))
 372                 __audit_fd_pair(fd1, fd2);
 373 }
 374 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 375 {
 376         if (unlikely(!audit_dummy_context()))
 377                 __audit_ipc_set_perm(qbytes, uid, gid, mode);
 378 }
 379 static inline void audit_bprm(struct linux_binprm *bprm)
 380 {
 381         if (unlikely(!audit_dummy_context()))
 382                 __audit_bprm(bprm);
 383 }
 384 static inline int audit_socketcall(int nargs, unsigned long *args)
 385 {
 386         if (unlikely(!audit_dummy_context()))
 387                 return __audit_socketcall(nargs, args);
 388         return 0;
 389 }
 390
 391 static inline int audit_socketcall_compat(int nargs, u32 *args)
 392 {
 393         unsigned long a[AUDITSC_ARGS];
 394         int i;
 395
 396         if (audit_dummy_context())
 397                 return 0;
 398
 399         for (i = 0; i < nargs; i++)
 400                 a[i] = (unsigned long)args[i];
 401         return __audit_socketcall(nargs, a);
 402 }
 403
 404 static inline int audit_sockaddr(int len, void *addr)
 405 {
 406         if (unlikely(!audit_dummy_context()))
 407                 return __audit_sockaddr(len, addr);
 408         return 0;
 409 }
 410 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 411 {
 412         if (unlikely(!audit_dummy_context()))
 413                 __audit_mq_open(oflag, mode, attr);
 414 }
 415 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
 416 {
 417         if (unlikely(!audit_dummy_context()))
 418                 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 419 }
 420 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 421 {
 422         if (unlikely(!audit_dummy_context()))
 423                 __audit_mq_notify(mqdes, notification);
 424 }
 425 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 426 {
 427         if (unlikely(!audit_dummy_context()))
 428                 __audit_mq_getsetattr(mqdes, mqstat);
 429 }
 430
 431 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 432                                        const struct cred *new,
 433                                        const struct cred *old)
 434 {
 435         if (unlikely(!audit_dummy_context()))
 436                 return __audit_log_bprm_fcaps(bprm, new, old);
 437         return 0;
 438 }
 439
 440 static inline void audit_log_capset(const struct cred *new,
 441                                    const struct cred *old)
 442 {
 443         if (unlikely(!audit_dummy_context()))
 444                 __audit_log_capset(new, old);
 445 }
 446
 447 static inline void audit_mmap_fd(int fd, int flags)
 448 {
 449         if (unlikely(!audit_dummy_context()))
 450                 __audit_mmap_fd(fd, flags);
 451 }
 452
 453 static inline void audit_log_kern_module(char *name)
 454 {
 455         if (!audit_dummy_context())
 456                 __audit_log_kern_module(name);
 457 }
 458
 459 extern int audit_n_rules;
 460 extern int audit_signals;
 461 #else /* CONFIG_AUDITSYSCALL */
 462 static inline int audit_alloc(struct task_struct *task)
 463 {
 464         return 0;
 465 }
 466 static inline void audit_free(struct task_struct *task)
 467 { }
 468 static inline void audit_syscall_entry(int major, unsigned long a0,
 469                                        unsigned long a1, unsigned long a2,
 470                                        unsigned long a3)
 471 { }
 472 static inline void audit_syscall_exit(void *pt_regs)
 473 { }
 474 static inline bool audit_dummy_context(void)
 475 {
 476         return true;
 477 }
 478 static inline struct filename *audit_reusename(const __user char *name)
 479 {
 480         return NULL;
 481 }
 482 static inline void audit_getname(struct filename *name)
 483 { }
 484 static inline void __audit_inode(struct filename *name,
 485                                         const struct dentry *dentry,
 486                                         unsigned int flags)
 487 { }
 488 static inline void __audit_inode_child(struct inode *parent,
 489                                         const struct dentry *dentry,
 490                                         const unsigned char type)
 491 { }
 492 static inline void audit_inode(struct filename *name,
 493                                 const struct dentry *dentry,
 494                                 unsigned int parent)
 495 { }
 496 static inline void audit_file(struct file *file)
 497 {
 498 }
 499 static inline void audit_inode_parent_hidden(struct filename *name,
 500                                 const struct dentry *dentry)
 501 { }
 502 static inline void audit_inode_child(struct inode *parent,
 503                                      const struct dentry *dentry,
 504                                      const unsigned char type)
 505 { }
 506 static inline void audit_core_dumps(long signr)
 507 { }
 508 static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 509 { }
 510 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 511 { }
 512 static inline int auditsc_get_stamp(struct audit_context *ctx,
 513                               struct timespec64 *t, unsigned int *serial)
 514 {
 515         return 0;
 516 }
 517 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 518 {
 519         return INVALID_UID;
 520 }
 521 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 522 {
 523         return -1;
 524 }
 525 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 526 { }
 527 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 528                                         gid_t gid, umode_t mode)
 529 { }
 530 static inline void audit_bprm(struct linux_binprm *bprm)
 531 { }
 532 static inline int audit_socketcall(int nargs, unsigned long *args)
 533 {
 534         return 0;
 535 }
 536
 537 static inline int audit_socketcall_compat(int nargs, u32 *args)
 538 {
 539         return 0;
 540 }
 541
 542 static inline void audit_fd_pair(int fd1, int fd2)
 543 { }
 544 static inline int audit_sockaddr(int len, void *addr)
 545 {
 546         return 0;
 547 }
 548 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 549 { }
 550 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 551                                      unsigned int msg_prio,
 552                                      const struct timespec *abs_timeout)
 553 { }
 554 static inline void audit_mq_notify(mqd_t mqdes,
 555                                    const struct sigevent *notification)
 556 { }
 557 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 558 { }
 559 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 560                                        const struct cred *new,
 561                                        const struct cred *old)
 562 {
 563         return 0;
 564 }
 565 static inline void audit_log_capset(const struct cred *new,
 566                                     const struct cred *old)
 567 { }
 568 static inline void audit_mmap_fd(int fd, int flags)
 569 { }
 570
 571 static inline void audit_log_kern_module(char *name)
 572 {
 573 }
 574
 575 static inline void audit_ptrace(struct task_struct *t)
 576 { }
 577 #define audit_n_rules 0
 578 #define audit_signals 0
 579 #endif /* CONFIG_AUDITSYSCALL */
 580
 581 static inline bool audit_loginuid_set(struct task_struct *tsk)
 582 {
 583         return uid_valid(audit_get_loginuid(tsk));
 584 }
 585
 586 static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 587 {
 588         audit_log_n_string(ab, buf, strlen(buf));
 589 }
 590
 591 #endif