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