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 && unlikely(!audit_dummy_context()))
 318                 __audit_seccomp(syscall, signr, code);
 319 }
 320
 321 static inline void audit_ptrace(struct task_struct *t)
 322 {
 323         if (unlikely(!audit_dummy_context()))
 324                 __audit_ptrace(t);
 325 }
 326
 327                                 /* Private API (for audit.c only) */
 328 extern unsigned int audit_serial(void);
 329 extern int auditsc_get_stamp(struct audit_context *ctx,
 330                               struct timespec64 *t, unsigned int *serial);
 331 extern int audit_set_loginuid(kuid_t loginuid);
 332
 333 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 334 {
 335         return tsk->loginuid;
 336 }
 337
 338 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 339 {
 340         return tsk->sessionid;
 341 }
 342
 343 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 344 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 345 extern void __audit_bprm(struct linux_binprm *bprm);
 346 extern int __audit_socketcall(int nargs, unsigned long *args);
 347 extern int __audit_sockaddr(int len, void *addr);
 348 extern void __audit_fd_pair(int fd1, int fd2);
 349 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 350 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout);
 351 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 352 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 353 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 354                                   const struct cred *new,
 355                                   const struct cred *old);
 356 extern void __audit_log_capset(const struct cred *new, const struct cred *old);
 357 extern void __audit_mmap_fd(int fd, int flags);
 358 extern void __audit_log_kern_module(char *name);
 359
 360 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 361 {
 362         if (unlikely(!audit_dummy_context()))
 363                 __audit_ipc_obj(ipcp);
 364 }
 365 static inline void audit_fd_pair(int fd1, int fd2)
 366 {
 367         if (unlikely(!audit_dummy_context()))
 368                 __audit_fd_pair(fd1, fd2);
 369 }
 370 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 371 {
 372         if (unlikely(!audit_dummy_context()))
 373                 __audit_ipc_set_perm(qbytes, uid, gid, mode);
 374 }
 375 static inline void audit_bprm(struct linux_binprm *bprm)
 376 {
 377         if (unlikely(!audit_dummy_context()))
 378                 __audit_bprm(bprm);
 379 }
 380 static inline int audit_socketcall(int nargs, unsigned long *args)
 381 {
 382         if (unlikely(!audit_dummy_context()))
 383                 return __audit_socketcall(nargs, args);
 384         return 0;
 385 }
 386
 387 static inline int audit_socketcall_compat(int nargs, u32 *args)
 388 {
 389         unsigned long a[AUDITSC_ARGS];
 390         int i;
 391
 392         if (audit_dummy_context())
 393                 return 0;
 394
 395         for (i = 0; i < nargs; i++)
 396                 a[i] = (unsigned long)args[i];
 397         return __audit_socketcall(nargs, a);
 398 }
 399
 400 static inline int audit_sockaddr(int len, void *addr)
 401 {
 402         if (unlikely(!audit_dummy_context()))
 403                 return __audit_sockaddr(len, addr);
 404         return 0;
 405 }
 406 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 407 {
 408         if (unlikely(!audit_dummy_context()))
 409                 __audit_mq_open(oflag, mode, attr);
 410 }
 411 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec64 *abs_timeout)
 412 {
 413         if (unlikely(!audit_dummy_context()))
 414                 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 415 }
 416 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 417 {
 418         if (unlikely(!audit_dummy_context()))
 419                 __audit_mq_notify(mqdes, notification);
 420 }
 421 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 422 {
 423         if (unlikely(!audit_dummy_context()))
 424                 __audit_mq_getsetattr(mqdes, mqstat);
 425 }
 426
 427 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 428                                        const struct cred *new,
 429                                        const struct cred *old)
 430 {
 431         if (unlikely(!audit_dummy_context()))
 432                 return __audit_log_bprm_fcaps(bprm, new, old);
 433         return 0;
 434 }
 435
 436 static inline void audit_log_capset(const struct cred *new,
 437                                    const struct cred *old)
 438 {
 439         if (unlikely(!audit_dummy_context()))
 440                 __audit_log_capset(new, old);
 441 }
 442
 443 static inline void audit_mmap_fd(int fd, int flags)
 444 {
 445         if (unlikely(!audit_dummy_context()))
 446                 __audit_mmap_fd(fd, flags);
 447 }
 448
 449 static inline void audit_log_kern_module(char *name)
 450 {
 451         if (!audit_dummy_context())
 452                 __audit_log_kern_module(name);
 453 }
 454
 455 extern int audit_n_rules;
 456 extern int audit_signals;
 457 #else /* CONFIG_AUDITSYSCALL */
 458 static inline int audit_alloc(struct task_struct *task)
 459 {
 460         return 0;
 461 }
 462 static inline void audit_free(struct task_struct *task)
 463 { }
 464 static inline void audit_syscall_entry(int major, unsigned long a0,
 465                                        unsigned long a1, unsigned long a2,
 466                                        unsigned long a3)
 467 { }
 468 static inline void audit_syscall_exit(void *pt_regs)
 469 { }
 470 static inline bool audit_dummy_context(void)
 471 {
 472         return true;
 473 }
 474 static inline struct filename *audit_reusename(const __user char *name)
 475 {
 476         return NULL;
 477 }
 478 static inline void audit_getname(struct filename *name)
 479 { }
 480 static inline void __audit_inode(struct filename *name,
 481                                         const struct dentry *dentry,
 482                                         unsigned int flags)
 483 { }
 484 static inline void __audit_inode_child(struct inode *parent,
 485                                         const struct dentry *dentry,
 486                                         const unsigned char type)
 487 { }
 488 static inline void audit_inode(struct filename *name,
 489                                 const struct dentry *dentry,
 490                                 unsigned int parent)
 491 { }
 492 static inline void audit_file(struct file *file)
 493 {
 494 }
 495 static inline void audit_inode_parent_hidden(struct filename *name,
 496                                 const struct dentry *dentry)
 497 { }
 498 static inline void audit_inode_child(struct inode *parent,
 499                                      const struct dentry *dentry,
 500                                      const unsigned char type)
 501 { }
 502 static inline void audit_core_dumps(long signr)
 503 { }
 504 static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 505 { }
 506 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 507 { }
 508 static inline int auditsc_get_stamp(struct audit_context *ctx,
 509                               struct timespec64 *t, unsigned int *serial)
 510 {
 511         return 0;
 512 }
 513 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 514 {
 515         return INVALID_UID;
 516 }
 517 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 518 {
 519         return -1;
 520 }
 521 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 522 { }
 523 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 524                                         gid_t gid, umode_t mode)
 525 { }
 526 static inline void audit_bprm(struct linux_binprm *bprm)
 527 { }
 528 static inline int audit_socketcall(int nargs, unsigned long *args)
 529 {
 530         return 0;
 531 }
 532
 533 static inline int audit_socketcall_compat(int nargs, u32 *args)
 534 {
 535         return 0;
 536 }
 537
 538 static inline void audit_fd_pair(int fd1, int fd2)
 539 { }
 540 static inline int audit_sockaddr(int len, void *addr)
 541 {
 542         return 0;
 543 }
 544 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 545 { }
 546 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 547                                      unsigned int msg_prio,
 548                                      const struct timespec64 *abs_timeout)
 549 { }
 550 static inline void audit_mq_notify(mqd_t mqdes,
 551                                    const struct sigevent *notification)
 552 { }
 553 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 554 { }
 555 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 556                                        const struct cred *new,
 557                                        const struct cred *old)
 558 {
 559         return 0;
 560 }
 561 static inline void audit_log_capset(const struct cred *new,
 562                                     const struct cred *old)
 563 { }
 564 static inline void audit_mmap_fd(int fd, int flags)
 565 { }
 566
 567 static inline void audit_log_kern_module(char *name)
 568 {
 569 }
 570
 571 static inline void audit_ptrace(struct task_struct *t)
 572 { }
 573 #define audit_n_rules 0
 574 #define audit_signals 0
 575 #endif /* CONFIG_AUDITSYSCALL */
 576
 577 static inline bool audit_loginuid_set(struct task_struct *tsk)
 578 {
 579         return uid_valid(audit_get_loginuid(tsk));
 580 }
 581
 582 static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 583 {
 584         audit_log_n_string(ab, buf, strlen(buf));
 585 }
 586
 587 #endif