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
  47 struct audit_krule {
  48         int                     vers_ops;
  49         u32                     flags;
  50         u32                     listnr;
  51         u32                     action;
  52         u32                     mask[AUDIT_BITMASK_SIZE];
  53         u32                     buflen; /* for data alloc on list rules */
  54         u32                     field_count;
  55         char                    *filterkey; /* ties events to rules */
  56         struct audit_field      *fields;
  57         struct audit_field      *arch_f; /* quick access to arch field */
  58         struct audit_field      *inode_f; /* quick access to an inode field */
  59         struct audit_watch      *watch; /* associated watch */
  60         struct audit_tree       *tree;  /* associated watched tree */
  61         struct list_head        rlist;  /* entry in audit_{watch,tree}.rules list */
  62         struct list_head        list;   /* for AUDIT_LIST* purposes only */
  63         u64                     prio;
  64 };
  65
  66 struct audit_field {
  67         u32                             type;
  68         u32                             val;
  69         kuid_t                          uid;
  70         kgid_t                          gid;
  71         u32                             op;
  72         char                            *lsm_str;
  73         void                            *lsm_rule;
  74 };
  75
  76 extern int __init audit_register_class(int class, unsigned *list);
  77 extern int audit_classify_syscall(int abi, unsigned syscall);
  78 extern int audit_classify_arch(int arch);
  79
  80 /* audit_names->type values */
  81 #define AUDIT_TYPE_UNKNOWN      0       /* we don't know yet */
  82 #define AUDIT_TYPE_NORMAL       1       /* a "normal" audit record */
  83 #define AUDIT_TYPE_PARENT       2       /* a parent audit record */
  84 #define AUDIT_TYPE_CHILD_DELETE 3       /* a child being deleted */
  85 #define AUDIT_TYPE_CHILD_CREATE 4       /* a child being created */
  86
  87 /* maximized args number that audit_socketcall can process */
  88 #define AUDITSC_ARGS            6
  89
  90 struct filename;
  91
  92 extern void audit_log_session_info(struct audit_buffer *ab);
  93
  94 #ifdef CONFIG_AUDITSYSCALL
  95 /* These are defined in auditsc.c */
  96                                 /* Public API */
  97 extern int  audit_alloc(struct task_struct *task);
  98 extern void __audit_free(struct task_struct *task);
  99 extern void __audit_syscall_entry(int arch,
 100                                   int major, unsigned long a0, unsigned long a1,
 101                                   unsigned long a2, unsigned long a3);
 102 extern void __audit_syscall_exit(int ret_success, long ret_value);
 103 extern struct filename *__audit_reusename(const __user char *uptr);
 104 extern void __audit_getname(struct filename *name);
 105 extern void audit_putname(struct filename *name);
 106
 107 #define AUDIT_INODE_PARENT      1       /* dentry represents the parent */
 108 #define AUDIT_INODE_HIDDEN      2       /* audit record should be hidden */
 109 extern void __audit_inode(struct filename *name, const struct dentry *dentry,
 110                                 unsigned int flags);
 111 extern void __audit_inode_child(const struct inode *parent,
 112                                 const struct dentry *dentry,
 113                                 const unsigned char type);
 114 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 115 extern void __audit_ptrace(struct task_struct *t);
 116
 117 static inline int audit_dummy_context(void)
 118 {
 119         void *p = current->audit_context;
 120         return !p || *(int *)p;
 121 }
 122 static inline void audit_free(struct task_struct *task)
 123 {
 124         if (unlikely(task->audit_context))
 125                 __audit_free(task);
 126 }
 127 static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 128                                        unsigned long a1, unsigned long a2,
 129                                        unsigned long a3)
 130 {
 131         if (unlikely(current->audit_context))
 132                 __audit_syscall_entry(arch, major, a0, a1, a2, a3);
 133 }
 134 static inline void audit_syscall_exit(void *pt_regs)
 135 {
 136         if (unlikely(current->audit_context)) {
 137                 int success = is_syscall_success(pt_regs);
 138                 long return_code = regs_return_value(pt_regs);
 139
 140                 __audit_syscall_exit(success, return_code);
 141         }
 142 }
 143 static inline struct filename *audit_reusename(const __user char *name)
 144 {
 145         if (unlikely(!audit_dummy_context()))
 146                 return __audit_reusename(name);
 147         return NULL;
 148 }
 149 static inline void audit_getname(struct filename *name)
 150 {
 151         if (unlikely(!audit_dummy_context()))
 152                 __audit_getname(name);
 153 }
 154 static inline void audit_inode(struct filename *name,
 155                                 const struct dentry *dentry,
 156                                 unsigned int parent) {
 157         if (unlikely(!audit_dummy_context())) {
 158                 unsigned int flags = 0;
 159                 if (parent)
 160                         flags |= AUDIT_INODE_PARENT;
 161                 __audit_inode(name, dentry, flags);
 162         }
 163 }
 164 static inline void audit_inode_parent_hidden(struct filename *name,
 165                                                 const struct dentry *dentry)
 166 {
 167         if (unlikely(!audit_dummy_context()))
 168                 __audit_inode(name, dentry,
 169                                 AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN);
 170 }
 171 static inline void audit_inode_child(const struct inode *parent,
 172                                      const struct dentry *dentry,
 173                                      const unsigned char type) {
 174         if (unlikely(!audit_dummy_context()))
 175                 __audit_inode_child(parent, dentry, type);
 176 }
 177 void audit_core_dumps(long signr);
 178
 179 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 180 {
 181         /* Force a record to be reported if a signal was delivered. */
 182         if (signr || unlikely(!audit_dummy_context()))
 183                 __audit_seccomp(syscall, signr, code);
 184 }
 185
 186 static inline void audit_ptrace(struct task_struct *t)
 187 {
 188         if (unlikely(!audit_dummy_context()))
 189                 __audit_ptrace(t);
 190 }
 191
 192                                 /* Private API (for audit.c only) */
 193 extern unsigned int audit_serial(void);
 194 extern int auditsc_get_stamp(struct audit_context *ctx,
 195                               struct timespec *t, unsigned int *serial);
 196 extern int audit_set_loginuid(kuid_t loginuid);
 197
 198 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 199 {
 200         return tsk->loginuid;
 201 }
 202
 203 static inline int audit_get_sessionid(struct task_struct *tsk)
 204 {
 205         return tsk->sessionid;
 206 }
 207
 208 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 209 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 210 extern int __audit_bprm(struct linux_binprm *bprm);
 211 extern int __audit_socketcall(int nargs, unsigned long *args);
 212 extern int __audit_sockaddr(int len, void *addr);
 213 extern void __audit_fd_pair(int fd1, int fd2);
 214 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 215 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
 216 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 217 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 218 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 219                                   const struct cred *new,
 220                                   const struct cred *old);
 221 extern void __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
 222 extern void __audit_mmap_fd(int fd, int flags);
 223
 224 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 225 {
 226         if (unlikely(!audit_dummy_context()))
 227                 __audit_ipc_obj(ipcp);
 228 }
 229 static inline void audit_fd_pair(int fd1, int fd2)
 230 {
 231         if (unlikely(!audit_dummy_context()))
 232                 __audit_fd_pair(fd1, fd2);
 233 }
 234 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 235 {
 236         if (unlikely(!audit_dummy_context()))
 237                 __audit_ipc_set_perm(qbytes, uid, gid, mode);
 238 }
 239 static inline int audit_bprm(struct linux_binprm *bprm)
 240 {
 241         if (unlikely(!audit_dummy_context()))
 242                 return __audit_bprm(bprm);
 243         return 0;
 244 }
 245 static inline int audit_socketcall(int nargs, unsigned long *args)
 246 {
 247         if (unlikely(!audit_dummy_context()))
 248                 return __audit_socketcall(nargs, args);
 249         return 0;
 250 }
 251 static inline int audit_sockaddr(int len, void *addr)
 252 {
 253         if (unlikely(!audit_dummy_context()))
 254                 return __audit_sockaddr(len, addr);
 255         return 0;
 256 }
 257 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 258 {
 259         if (unlikely(!audit_dummy_context()))
 260                 __audit_mq_open(oflag, mode, attr);
 261 }
 262 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
 263 {
 264         if (unlikely(!audit_dummy_context()))
 265                 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 266 }
 267 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 268 {
 269         if (unlikely(!audit_dummy_context()))
 270                 __audit_mq_notify(mqdes, notification);
 271 }
 272 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 273 {
 274         if (unlikely(!audit_dummy_context()))
 275                 __audit_mq_getsetattr(mqdes, mqstat);
 276 }
 277
 278 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 279                                        const struct cred *new,
 280                                        const struct cred *old)
 281 {
 282         if (unlikely(!audit_dummy_context()))
 283                 return __audit_log_bprm_fcaps(bprm, new, old);
 284         return 0;
 285 }
 286
 287 static inline void audit_log_capset(pid_t pid, const struct cred *new,
 288                                    const struct cred *old)
 289 {
 290         if (unlikely(!audit_dummy_context()))
 291                 __audit_log_capset(pid, new, old);
 292 }
 293
 294 static inline void audit_mmap_fd(int fd, int flags)
 295 {
 296         if (unlikely(!audit_dummy_context()))
 297                 __audit_mmap_fd(fd, flags);
 298 }
 299
 300 extern int audit_n_rules;
 301 extern int audit_signals;
 302 #else /* CONFIG_AUDITSYSCALL */
 303 static inline int audit_alloc(struct task_struct *task)
 304 {
 305         return 0;
 306 }
 307 static inline void audit_free(struct task_struct *task)
 308 { }
 309 static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 310                                        unsigned long a1, unsigned long a2,
 311                                        unsigned long a3)
 312 { }
 313 static inline void audit_syscall_exit(void *pt_regs)
 314 { }
 315 static inline int audit_dummy_context(void)
 316 {
 317         return 1;
 318 }
 319 static inline struct filename *audit_reusename(const __user char *name)
 320 {
 321         return NULL;
 322 }
 323 static inline void audit_getname(struct filename *name)
 324 { }
 325 static inline void audit_putname(struct filename *name)
 326 { }
 327 static inline void __audit_inode(struct filename *name,
 328                                         const struct dentry *dentry,
 329                                         unsigned int flags)
 330 { }
 331 static inline void __audit_inode_child(const struct inode *parent,
 332                                         const struct dentry *dentry,
 333                                         const unsigned char type)
 334 { }
 335 static inline void audit_inode(struct filename *name,
 336                                 const struct dentry *dentry,
 337                                 unsigned int parent)
 338 { }
 339 static inline void audit_inode_parent_hidden(struct filename *name,
 340                                 const struct dentry *dentry)
 341 { }
 342 static inline void audit_inode_child(const struct inode *parent,
 343                                      const struct dentry *dentry,
 344                                      const unsigned char type)
 345 { }
 346 static inline void audit_core_dumps(long signr)
 347 { }
 348 static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 349 { }
 350 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 351 { }
 352 static inline int auditsc_get_stamp(struct audit_context *ctx,
 353                               struct timespec *t, unsigned int *serial)
 354 {
 355         return 0;
 356 }
 357 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 358 {
 359         return INVALID_UID;
 360 }
 361 static inline int audit_get_sessionid(struct task_struct *tsk)
 362 {
 363         return -1;
 364 }
 365 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 366 { }
 367 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 368                                         gid_t gid, umode_t mode)
 369 { }
 370 static inline int audit_bprm(struct linux_binprm *bprm)
 371 {
 372         return 0;
 373 }
 374 static inline int audit_socketcall(int nargs, unsigned long *args)
 375 {
 376         return 0;
 377 }
 378 static inline void audit_fd_pair(int fd1, int fd2)
 379 { }
 380 static inline int audit_sockaddr(int len, void *addr)
 381 {
 382         return 0;
 383 }
 384 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 385 { }
 386 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 387                                      unsigned int msg_prio,
 388                                      const struct timespec *abs_timeout)
 389 { }
 390 static inline void audit_mq_notify(mqd_t mqdes,
 391                                    const struct sigevent *notification)
 392 { }
 393 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 394 { }
 395 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 396                                        const struct cred *new,
 397                                        const struct cred *old)
 398 {
 399         return 0;
 400 }
 401 static inline void audit_log_capset(pid_t pid, const struct cred *new,
 402                                    const struct cred *old)
 403 { }
 404 static inline void audit_mmap_fd(int fd, int flags)
 405 { }
 406 static inline void audit_ptrace(struct task_struct *t)
 407 { }
 408 #define audit_n_rules 0
 409 #define audit_signals 0
 410 #endif /* CONFIG_AUDITSYSCALL */
 411
 412 static inline bool audit_loginuid_set(struct task_struct *tsk)
 413 {
 414         return uid_valid(audit_get_loginuid(tsk));
 415 }
 416
 417 #ifdef CONFIG_AUDIT
 418 /* These are defined in audit.c */
 419                                 /* Public API */
 420 extern __printf(4, 5)
 421 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 422                const char *fmt, ...);
 423
 424 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
 425 extern __printf(2, 3)
 426 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
 427 extern void                 audit_log_end(struct audit_buffer *ab);
 428 extern int                  audit_string_contains_control(const char *string,
 429                                                           size_t len);
 430 extern void                 audit_log_n_hex(struct audit_buffer *ab,
 431                                           const unsigned char *buf,
 432                                           size_t len);
 433 extern void                 audit_log_n_string(struct audit_buffer *ab,
 434                                                const char *buf,
 435                                                size_t n);
 436 extern void                 audit_log_n_untrustedstring(struct audit_buffer *ab,
 437                                                         const char *string,
 438                                                         size_t n);
 439 extern void                 audit_log_untrustedstring(struct audit_buffer *ab,
 440                                                       const char *string);
 441 extern void                 audit_log_d_path(struct audit_buffer *ab,
 442                                              const char *prefix,
 443                                              const struct path *path);
 444 extern void                 audit_log_key(struct audit_buffer *ab,
 445                                           char *key);
 446 extern void                 audit_log_link_denied(const char *operation,
 447                                                   struct path *link);
 448 extern void                 audit_log_lost(const char *message);
 449 #ifdef CONFIG_SECURITY
 450 extern void                 audit_log_secctx(struct audit_buffer *ab, u32 secid);
 451 #else
 452 static inline void          audit_log_secctx(struct audit_buffer *ab, u32 secid)
 453 { }
 454 #endif
 455
 456 extern int audit_log_task_context(struct audit_buffer *ab);
 457 extern void audit_log_task_info(struct audit_buffer *ab,
 458                                 struct task_struct *tsk);
 459
 460 extern int                  audit_update_lsm_rules(void);
 461
 462                                 /* Private API (for audit.c only) */
 463 extern int audit_filter_user(int type);
 464 extern int audit_filter_type(int type);
 465 extern int  audit_receive_filter(int type, int pid, int seq,
 466                                 void *data, size_t datasz);
 467 extern int audit_enabled;
 468 #else /* CONFIG_AUDIT */
 469 static inline __printf(4, 5)
 470 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 471                const char *fmt, ...)
 472 { }
 473 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
 474                                                    gfp_t gfp_mask, int type)
 475 {
 476         return NULL;
 477 }
 478 static inline __printf(2, 3)
 479 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
 480 { }
 481 static inline void audit_log_end(struct audit_buffer *ab)
 482 { }
 483 static inline void audit_log_n_hex(struct audit_buffer *ab,
 484                                    const unsigned char *buf, size_t len)
 485 { }
 486 static inline void audit_log_n_string(struct audit_buffer *ab,
 487                                       const char *buf, size_t n)
 488 { }
 489 static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
 490                                                 const char *string, size_t n)
 491 { }
 492 static inline void audit_log_untrustedstring(struct audit_buffer *ab,
 493                                              const char *string)
 494 { }
 495 static inline void audit_log_d_path(struct audit_buffer *ab,
 496                                     const char *prefix,
 497                                     const struct path *path)
 498 { }
 499 static inline void audit_log_key(struct audit_buffer *ab, char *key)
 500 { }
 501 static inline void audit_log_link_denied(const char *string,
 502                                          const struct path *link)
 503 { }
 504 static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
 505 { }
 506 static inline int audit_log_task_context(struct audit_buffer *ab)
 507 {
 508         return 0;
 509 }
 510 static inline void audit_log_task_info(struct audit_buffer *ab,
 511                                        struct task_struct *tsk)
 512 { }
 513 #define audit_enabled 0
 514 #endif /* CONFIG_AUDIT */
 515 static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 516 {
 517         audit_log_n_string(ab, buf, strlen(buf));
 518 }
 519
 520 #endif