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