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
 153 extern int audit_log_task_context(struct audit_buffer *ab);
 154 extern void audit_log_task_info(struct audit_buffer *ab,
 155                                 struct task_struct *tsk);
 156
 157 extern int                  audit_update_lsm_rules(void);
 158
 159                                 /* Private API (for audit.c only) */
 160 extern int audit_rule_change(int type, int seq, void *data, size_t datasz);
 161 extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
 162
 163 extern u32 audit_enabled;
 164 #else /* CONFIG_AUDIT */
 165 static inline __printf(4, 5)
 166 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 167                const char *fmt, ...)
 168 { }
 169 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
 170                                                    gfp_t gfp_mask, int type)
 171 {
 172         return NULL;
 173 }
 174 static inline __printf(2, 3)
 175 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
 176 { }
 177 static inline void audit_log_end(struct audit_buffer *ab)
 178 { }
 179 static inline void audit_log_n_hex(struct audit_buffer *ab,
 180                                    const unsigned char *buf, size_t len)
 181 { }
 182 static inline void audit_log_n_string(struct audit_buffer *ab,
 183                                       const char *buf, size_t n)
 184 { }
 185 static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
 186                                                 const char *string, size_t n)
 187 { }
 188 static inline void audit_log_untrustedstring(struct audit_buffer *ab,
 189                                              const char *string)
 190 { }
 191 static inline void audit_log_d_path(struct audit_buffer *ab,
 192                                     const char *prefix,
 193                                     const struct path *path)
 194 { }
 195 static inline void audit_log_key(struct audit_buffer *ab, char *key)
 196 { }
 197 static inline void audit_log_link_denied(const char *string,
 198                                          const struct path *link)
 199 { }
 200 static inline int audit_log_task_context(struct audit_buffer *ab)
 201 {
 202         return 0;
 203 }
 204 static inline void audit_log_task_info(struct audit_buffer *ab,
 205                                        struct task_struct *tsk)
 206 { }
 207 #define audit_enabled 0
 208 #endif /* CONFIG_AUDIT */
 209
 210 #ifdef CONFIG_AUDIT_COMPAT_GENERIC
 211 #define audit_is_compat(arch)  (!((arch) & __AUDIT_ARCH_64BIT))
 212 #else
 213 #define audit_is_compat(arch)  false
 214 #endif
 215
 216 #ifdef CONFIG_AUDITSYSCALL
 217 #include <asm/syscall.h> /* for syscall_get_arch() */
 218
 219 /* These are defined in auditsc.c */
 220                                 /* Public API */
 221 extern int  audit_alloc(struct task_struct *task);
 222 extern void __audit_free(struct task_struct *task);
 223 extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1,
 224                                   unsigned long a2, unsigned long a3);
 225 extern void __audit_syscall_exit(int ret_success, long ret_value);
 226 extern struct filename *__audit_reusename(const __user char *uptr);
 227 extern void __audit_getname(struct filename *name);
 228
 229 #define AUDIT_INODE_PARENT      1       /* dentry represents the parent */
 230 #define AUDIT_INODE_HIDDEN      2       /* audit record should be hidden */
 231 extern void __audit_inode(struct filename *name, const struct dentry *dentry,
 232                                 unsigned int flags);
 233 extern void __audit_file(const struct file *);
 234 extern void __audit_inode_child(struct inode *parent,
 235                                 const struct dentry *dentry,
 236                                 const unsigned char type);
 237 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 238 extern void __audit_ptrace(struct task_struct *t);
 239
 240 static inline bool audit_dummy_context(void)
 241 {
 242         void *p = current->audit_context;
 243         return !p || *(int *)p;
 244 }
 245 static inline void audit_free(struct task_struct *task)
 246 {
 247         if (unlikely(task->audit_context))
 248                 __audit_free(task);
 249 }
 250 static inline void audit_syscall_entry(int major, unsigned long a0,
 251                                        unsigned long a1, unsigned long a2,
 252                                        unsigned long a3)
 253 {
 254         if (unlikely(current->audit_context))
 255                 __audit_syscall_entry(major, a0, a1, a2, a3);
 256 }
 257 static inline void audit_syscall_exit(void *pt_regs)
 258 {
 259         if (unlikely(current->audit_context)) {
 260                 int success = is_syscall_success(pt_regs);
 261                 long return_code = regs_return_value(pt_regs);
 262
 263                 __audit_syscall_exit(success, return_code);
 264         }
 265 }
 266 static inline struct filename *audit_reusename(const __user char *name)
 267 {
 268         if (unlikely(!audit_dummy_context()))
 269                 return __audit_reusename(name);
 270         return NULL;
 271 }
 272 static inline void audit_getname(struct filename *name)
 273 {
 274         if (unlikely(!audit_dummy_context()))
 275                 __audit_getname(name);
 276 }
 277 static inline void audit_inode(struct filename *name,
 278                                 const struct dentry *dentry,
 279                                 unsigned int parent) {
 280         if (unlikely(!audit_dummy_context())) {
 281                 unsigned int flags = 0;
 282                 if (parent)
 283                         flags |= AUDIT_INODE_PARENT;
 284                 __audit_inode(name, dentry, flags);
 285         }
 286 }
 287 static inline void audit_file(struct file *file)
 288 {
 289         if (unlikely(!audit_dummy_context()))
 290                 __audit_file(file);
 291 }
 292 static inline void audit_inode_parent_hidden(struct filename *name,
 293                                                 const struct dentry *dentry)
 294 {
 295         if (unlikely(!audit_dummy_context()))
 296                 __audit_inode(name, dentry,
 297                                 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
 298 }
 299 static inline void audit_inode_child(struct inode *parent,
 300                                      const struct dentry *dentry,
 301                                      const unsigned char type) {
 302         if (unlikely(!audit_dummy_context()))
 303                 __audit_inode_child(parent, dentry, type);
 304 }
 305 void audit_core_dumps(long signr);
 306
 307 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 308 {
 309         if (audit_enabled && unlikely(!audit_dummy_context()))
 310                 __audit_seccomp(syscall, signr, code);
 311 }
 312
 313 static inline void audit_ptrace(struct task_struct *t)
 314 {
 315         if (unlikely(!audit_dummy_context()))
 316                 __audit_ptrace(t);
 317 }
 318
 319                                 /* Private API (for audit.c only) */
 320 extern unsigned int audit_serial(void);
 321 extern int auditsc_get_stamp(struct audit_context *ctx,
 322                               struct timespec64 *t, unsigned int *serial);
 323 extern int audit_set_loginuid(kuid_t loginuid);
 324
 325 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 326 {
 327         return tsk->loginuid;
 328 }
 329
 330 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 331 {
 332         return tsk->sessionid;
 333 }
 334
 335 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 336 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 337 extern void __audit_bprm(struct linux_binprm *bprm);
 338 extern int __audit_socketcall(int nargs, unsigned long *args);
 339 extern int __audit_sockaddr(int len, void *addr);
 340 extern void __audit_fd_pair(int fd1, int fd2);
 341 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 342 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout);
 343 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 344 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 345 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 346                                   const struct cred *new,
 347                                   const struct cred *old);
 348 extern void __audit_log_capset(const struct cred *new, const struct cred *old);
 349 extern void __audit_mmap_fd(int fd, int flags);
 350 extern void __audit_log_kern_module(char *name);
 351 extern void __audit_fanotify(unsigned int response);
 352
 353 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 354 {
 355         if (unlikely(!audit_dummy_context()))
 356                 __audit_ipc_obj(ipcp);
 357 }
 358 static inline void audit_fd_pair(int fd1, int fd2)
 359 {
 360         if (unlikely(!audit_dummy_context()))
 361                 __audit_fd_pair(fd1, fd2);
 362 }
 363 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 364 {
 365         if (unlikely(!audit_dummy_context()))
 366                 __audit_ipc_set_perm(qbytes, uid, gid, mode);
 367 }
 368 static inline void audit_bprm(struct linux_binprm *bprm)
 369 {
 370         if (unlikely(!audit_dummy_context()))
 371                 __audit_bprm(bprm);
 372 }
 373 static inline int audit_socketcall(int nargs, unsigned long *args)
 374 {
 375         if (unlikely(!audit_dummy_context()))
 376                 return __audit_socketcall(nargs, args);
 377         return 0;
 378 }
 379
 380 static inline int audit_socketcall_compat(int nargs, u32 *args)
 381 {
 382         unsigned long a[AUDITSC_ARGS];
 383         int i;
 384
 385         if (audit_dummy_context())
 386                 return 0;
 387
 388         for (i = 0; i < nargs; i++)
 389                 a[i] = (unsigned long)args[i];
 390         return __audit_socketcall(nargs, a);
 391 }
 392
 393 static inline int audit_sockaddr(int len, void *addr)
 394 {
 395         if (unlikely(!audit_dummy_context()))
 396                 return __audit_sockaddr(len, addr);
 397         return 0;
 398 }
 399 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 400 {
 401         if (unlikely(!audit_dummy_context()))
 402                 __audit_mq_open(oflag, mode, attr);
 403 }
 404 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout)
 405 {
 406         if (unlikely(!audit_dummy_context()))
 407                 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 408 }
 409 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 410 {
 411         if (unlikely(!audit_dummy_context()))
 412                 __audit_mq_notify(mqdes, notification);
 413 }
 414 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 415 {
 416         if (unlikely(!audit_dummy_context()))
 417                 __audit_mq_getsetattr(mqdes, mqstat);
 418 }
 419
 420 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 421                                        const struct cred *new,
 422                                        const struct cred *old)
 423 {
 424         if (unlikely(!audit_dummy_context()))
 425                 return __audit_log_bprm_fcaps(bprm, new, old);
 426         return 0;
 427 }
 428
 429 static inline void audit_log_capset(const struct cred *new,
 430                                    const struct cred *old)
 431 {
 432         if (unlikely(!audit_dummy_context()))
 433                 __audit_log_capset(new, old);
 434 }
 435
 436 static inline void audit_mmap_fd(int fd, int flags)
 437 {
 438         if (unlikely(!audit_dummy_context()))
 439                 __audit_mmap_fd(fd, flags);
 440 }
 441
 442 static inline void audit_log_kern_module(char *name)
 443 {
 444         if (!audit_dummy_context())
 445                 __audit_log_kern_module(name);
 446 }
 447
 448 static inline void audit_fanotify(unsigned int response)
 449 {
 450         if (!audit_dummy_context())
 451                 __audit_fanotify(response);
 452 }
 453
 454 extern int audit_n_rules;
 455 extern int audit_signals;
 456 #else /* CONFIG_AUDITSYSCALL */
 457 static inline int audit_alloc(struct task_struct *task)
 458 {
 459         return 0;
 460 }
 461 static inline void audit_free(struct task_struct *task)
 462 { }
 463 static inline void audit_syscall_entry(int major, unsigned long a0,
 464                                        unsigned long a1, unsigned long a2,
 465                                        unsigned long a3)
 466 { }
 467 static inline void audit_syscall_exit(void *pt_regs)
 468 { }
 469 static inline bool audit_dummy_context(void)
 470 {
 471         return true;
 472 }
 473 static inline struct filename *audit_reusename(const __user char *name)
 474 {
 475         return NULL;
 476 }
 477 static inline void audit_getname(struct filename *name)
 478 { }
 479 static inline void __audit_inode(struct filename *name,
 480                                         const struct dentry *dentry,
 481                                         unsigned int flags)
 482 { }
 483 static inline void __audit_inode_child(struct inode *parent,
 484                                         const struct dentry *dentry,
 485                                         const unsigned char type)
 486 { }
 487 static inline void audit_inode(struct filename *name,
 488                                 const struct dentry *dentry,
 489                                 unsigned int parent)
 490 { }
 491 static inline void audit_file(struct file *file)
 492 {
 493 }
 494 static inline void audit_inode_parent_hidden(struct filename *name,
 495                                 const struct dentry *dentry)
 496 { }
 497 static inline void audit_inode_child(struct inode *parent,
 498                                      const struct dentry *dentry,
 499                                      const unsigned char type)
 500 { }
 501 static inline void audit_core_dumps(long signr)
 502 { }
 503 static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 504 { }
 505 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 506 { }
 507 static inline int auditsc_get_stamp(struct audit_context *ctx,
 508                               struct timespec64 *t, unsigned int *serial)
 509 {
 510         return 0;
 511 }
 512 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 513 {
 514         return INVALID_UID;
 515 }
 516 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 517 {
 518         return -1;
 519 }
 520 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 521 { }
 522 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 523                                         gid_t gid, umode_t mode)
 524 { }
 525 static inline void audit_bprm(struct linux_binprm *bprm)
 526 { }
 527 static inline int audit_socketcall(int nargs, unsigned long *args)
 528 {
 529         return 0;
 530 }
 531
 532 static inline int audit_socketcall_compat(int nargs, u32 *args)
 533 {
 534         return 0;
 535 }
 536
 537 static inline void audit_fd_pair(int fd1, int fd2)
 538 { }
 539 static inline int audit_sockaddr(int len, void *addr)
 540 {
 541         return 0;
 542 }
 543 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 544 { }
 545 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 546                                      unsigned int msg_prio,
 547                                      const struct timespec64 *abs_timeout)
 548 { }
 549 static inline void audit_mq_notify(mqd_t mqdes,
 550                                    const struct sigevent *notification)
 551 { }
 552 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 553 { }
 554 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 555                                        const struct cred *new,
 556                                        const struct cred *old)
 557 {
 558         return 0;
 559 }
 560 static inline void audit_log_capset(const struct cred *new,
 561                                     const struct cred *old)
 562 { }
 563 static inline void audit_mmap_fd(int fd, int flags)
 564 { }
 565
 566 static inline void audit_log_kern_module(char *name)
 567 {
 568 }
 569
 570 static inline void audit_fanotify(unsigned int response)
 571 { }
 572
 573 static inline void audit_ptrace(struct task_struct *t)
 574 { }
 575 #define audit_n_rules 0
 576 #define audit_signals 0
 577 #endif /* CONFIG_AUDITSYSCALL */
 578
 579 static inline bool audit_loginuid_set(struct task_struct *tsk)
 580 {
 581         return uid_valid(audit_get_loginuid(tsk));
 582 }
 583
 584 static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 585 {
 586         audit_log_n_string(ab, buf, strlen(buf));
 587 }
 588
 589 #endif