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 <uapi/linux/audit.h>
  28
  29 struct audit_sig_info {
  30         uid_t           uid;
  31         pid_t           pid;
  32         char            ctx[0];
  33 };
  34
  35 struct audit_buffer;
  36 struct audit_context;
  37 struct inode;
  38 struct netlink_skb_parms;
  39 struct path;
  40 struct linux_binprm;
  41 struct mq_attr;
  42 struct mqstat;
  43 struct audit_watch;
  44 struct audit_tree;
  45
  46 struct audit_krule {
  47         int                     vers_ops;
  48         u32                     flags;
  49         u32                     listnr;
  50         u32                     action;
  51         u32                     mask[AUDIT_BITMASK_SIZE];
  52         u32                     buflen; /* for data alloc on list rules */
  53         u32                     field_count;
  54         char                    *filterkey; /* ties events to rules */
  55         struct audit_field      *fields;
  56         struct audit_field      *arch_f; /* quick access to arch field */
  57         struct audit_field      *inode_f; /* quick access to an inode field */
  58         struct audit_watch      *watch; /* associated watch */
  59         struct audit_tree       *tree;  /* associated watched tree */
  60         struct list_head        rlist;  /* entry in audit_{watch,tree}.rules list */
  61         struct list_head        list;   /* for AUDIT_LIST* purposes only */
  62         u64                     prio;
  63 };
  64
  65 struct audit_field {
  66         u32                             type;
  67         u32                             val;
  68         kuid_t                          uid;
  69         kgid_t                          gid;
  70         u32                             op;
  71         char                            *lsm_str;
  72         void                            *lsm_rule;
  73 };
  74
  75 extern int __init audit_register_class(int class, unsigned *list);
  76 extern int audit_classify_syscall(int abi, unsigned syscall);
  77 extern int audit_classify_arch(int arch);
  78
  79 /* audit_names->type values */
  80 #define AUDIT_TYPE_UNKNOWN      0       /* we don't know yet */
  81 #define AUDIT_TYPE_NORMAL       1       /* a "normal" audit record */
  82 #define AUDIT_TYPE_PARENT       2       /* a parent audit record */
  83 #define AUDIT_TYPE_CHILD_DELETE 3       /* a child being deleted */
  84 #define AUDIT_TYPE_CHILD_CREATE 4       /* a child being created */
  85
  86 struct filename;
  87
  88 #ifdef CONFIG_AUDITSYSCALL
  89 /* These are defined in auditsc.c */
  90                                 /* Public API */
  91 extern int  audit_alloc(struct task_struct *task);
  92 extern void __audit_free(struct task_struct *task);
  93 extern void __audit_syscall_entry(int arch,
  94                                   int major, unsigned long a0, unsigned long a1,
  95                                   unsigned long a2, unsigned long a3);
  96 extern void __audit_syscall_exit(int ret_success, long ret_value);
  97 extern struct filename *__audit_reusename(const __user char *uptr);
  98 extern void __audit_getname(struct filename *name);
  99 extern void audit_putname(struct filename *name);
 100 extern void __audit_inode(struct filename *name, const struct dentry *dentry,
 101                                 unsigned int parent);
 102 extern void __audit_inode_child(const struct inode *parent,
 103                                 const struct dentry *dentry,
 104                                 const unsigned char type);
 105 extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 106 extern void __audit_ptrace(struct task_struct *t);
 107
 108 static inline int audit_dummy_context(void)
 109 {
 110         void *p = current->audit_context;
 111         return !p || *(int *)p;
 112 }
 113 static inline void audit_free(struct task_struct *task)
 114 {
 115         if (unlikely(task->audit_context))
 116                 __audit_free(task);
 117 }
 118 static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 119                                        unsigned long a1, unsigned long a2,
 120                                        unsigned long a3)
 121 {
 122         if (unlikely(!audit_dummy_context()))
 123                 __audit_syscall_entry(arch, major, a0, a1, a2, a3);
 124 }
 125 static inline void audit_syscall_exit(void *pt_regs)
 126 {
 127         if (unlikely(current->audit_context)) {
 128                 int success = is_syscall_success(pt_regs);
 129                 int return_code = regs_return_value(pt_regs);
 130
 131                 __audit_syscall_exit(success, return_code);
 132         }
 133 }
 134 static inline struct filename *audit_reusename(const __user char *name)
 135 {
 136         if (unlikely(!audit_dummy_context()))
 137                 return __audit_reusename(name);
 138         return NULL;
 139 }
 140 static inline void audit_getname(struct filename *name)
 141 {
 142         if (unlikely(!audit_dummy_context()))
 143                 __audit_getname(name);
 144 }
 145 static inline void audit_inode(struct filename *name, const struct dentry *dentry,
 146                                 unsigned int parent) {
 147         if (unlikely(!audit_dummy_context()))
 148                 __audit_inode(name, dentry, parent);
 149 }
 150 static inline void audit_inode_child(const struct inode *parent,
 151                                      const struct dentry *dentry,
 152                                      const unsigned char type) {
 153         if (unlikely(!audit_dummy_context()))
 154                 __audit_inode_child(parent, dentry, type);
 155 }
 156 void audit_core_dumps(long signr);
 157
 158 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 159 {
 160         if (unlikely(!audit_dummy_context()))
 161                 __audit_seccomp(syscall, signr, code);
 162 }
 163
 164 static inline void audit_ptrace(struct task_struct *t)
 165 {
 166         if (unlikely(!audit_dummy_context()))
 167                 __audit_ptrace(t);
 168 }
 169
 170                                 /* Private API (for audit.c only) */
 171 extern unsigned int audit_serial(void);
 172 extern int auditsc_get_stamp(struct audit_context *ctx,
 173                               struct timespec *t, unsigned int *serial);
 174 extern int audit_set_loginuid(kuid_t loginuid);
 175
 176 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 177 {
 178         return tsk->loginuid;
 179 }
 180
 181 static inline int audit_get_sessionid(struct task_struct *tsk)
 182 {
 183         return tsk->sessionid;
 184 }
 185
 186 extern void audit_log_task_context(struct audit_buffer *ab);
 187 extern void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk);
 188 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 189 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 190 extern int __audit_bprm(struct linux_binprm *bprm);
 191 extern void __audit_socketcall(int nargs, unsigned long *args);
 192 extern int __audit_sockaddr(int len, void *addr);
 193 extern void __audit_fd_pair(int fd1, int fd2);
 194 extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 195 extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
 196 extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 197 extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 198 extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 199                                   const struct cred *new,
 200                                   const struct cred *old);
 201 extern void __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
 202 extern void __audit_mmap_fd(int fd, int flags);
 203
 204 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 205 {
 206         if (unlikely(!audit_dummy_context()))
 207                 __audit_ipc_obj(ipcp);
 208 }
 209 static inline void audit_fd_pair(int fd1, int fd2)
 210 {
 211         if (unlikely(!audit_dummy_context()))
 212                 __audit_fd_pair(fd1, fd2);
 213 }
 214 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 215 {
 216         if (unlikely(!audit_dummy_context()))
 217                 __audit_ipc_set_perm(qbytes, uid, gid, mode);
 218 }
 219 static inline int audit_bprm(struct linux_binprm *bprm)
 220 {
 221         if (unlikely(!audit_dummy_context()))
 222                 return __audit_bprm(bprm);
 223         return 0;
 224 }
 225 static inline void audit_socketcall(int nargs, unsigned long *args)
 226 {
 227         if (unlikely(!audit_dummy_context()))
 228                 __audit_socketcall(nargs, args);
 229 }
 230 static inline int audit_sockaddr(int len, void *addr)
 231 {
 232         if (unlikely(!audit_dummy_context()))
 233                 return __audit_sockaddr(len, addr);
 234         return 0;
 235 }
 236 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 237 {
 238         if (unlikely(!audit_dummy_context()))
 239                 __audit_mq_open(oflag, mode, attr);
 240 }
 241 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
 242 {
 243         if (unlikely(!audit_dummy_context()))
 244                 __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 245 }
 246 static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 247 {
 248         if (unlikely(!audit_dummy_context()))
 249                 __audit_mq_notify(mqdes, notification);
 250 }
 251 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 252 {
 253         if (unlikely(!audit_dummy_context()))
 254                 __audit_mq_getsetattr(mqdes, mqstat);
 255 }
 256
 257 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 258                                        const struct cred *new,
 259                                        const struct cred *old)
 260 {
 261         if (unlikely(!audit_dummy_context()))
 262                 return __audit_log_bprm_fcaps(bprm, new, old);
 263         return 0;
 264 }
 265
 266 static inline void audit_log_capset(pid_t pid, const struct cred *new,
 267                                    const struct cred *old)
 268 {
 269         if (unlikely(!audit_dummy_context()))
 270                 __audit_log_capset(pid, new, old);
 271 }
 272
 273 static inline void audit_mmap_fd(int fd, int flags)
 274 {
 275         if (unlikely(!audit_dummy_context()))
 276                 __audit_mmap_fd(fd, flags);
 277 }
 278
 279 extern int audit_n_rules;
 280 extern int audit_signals;
 281 #else /* CONFIG_AUDITSYSCALL */
 282 static inline int audit_alloc(struct task_struct *task)
 283 {
 284         return 0;
 285 }
 286 static inline void audit_free(struct task_struct *task)
 287 { }
 288 static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 289                                        unsigned long a1, unsigned long a2,
 290                                        unsigned long a3)
 291 { }
 292 static inline void audit_syscall_exit(void *pt_regs)
 293 { }
 294 static inline int audit_dummy_context(void)
 295 {
 296         return 1;
 297 }
 298 static inline struct filename *audit_reusename(const __user char *name)
 299 {
 300         return NULL;
 301 }
 302 static inline void audit_getname(struct filename *name)
 303 { }
 304 static inline void audit_putname(struct filename *name)
 305 { }
 306 static inline void __audit_inode(struct filename *name,
 307                                         const struct dentry *dentry,
 308                                         unsigned int parent)
 309 { }
 310 static inline void __audit_inode_child(const struct inode *parent,
 311                                         const struct dentry *dentry,
 312                                         const unsigned char type)
 313 { }
 314 static inline void audit_inode(struct filename *name,
 315                                 const struct dentry *dentry,
 316                                 unsigned int parent)
 317 { }
 318 static inline void audit_inode_child(const struct inode *parent,
 319                                      const struct dentry *dentry,
 320                                      const unsigned char type)
 321 { }
 322 static inline void audit_core_dumps(long signr)
 323 { }
 324 static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 325 { }
 326 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 327 { }
 328 static inline int auditsc_get_stamp(struct audit_context *ctx,
 329                               struct timespec *t, unsigned int *serial)
 330 {
 331         return 0;
 332 }
 333 static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 334 {
 335         return INVALID_UID;
 336 }
 337 static inline int audit_get_sessionid(struct task_struct *tsk)
 338 {
 339         return -1;
 340 }
 341 static inline void audit_log_task_context(struct audit_buffer *ab)
 342 { }
 343 static inline void audit_log_task_info(struct audit_buffer *ab,
 344                                        struct task_struct *tsk)
 345 { }
 346 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 347 { }
 348 static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 349                                         gid_t gid, umode_t mode)
 350 { }
 351 static inline int audit_bprm(struct linux_binprm *bprm)
 352 {
 353         return 0;
 354 }
 355 static inline void audit_socketcall(int nargs, unsigned long *args)
 356 { }
 357 static inline void audit_fd_pair(int fd1, int fd2)
 358 { }
 359 static inline int audit_sockaddr(int len, void *addr)
 360 {
 361         return 0;
 362 }
 363 static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 364 { }
 365 static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 366                                      unsigned int msg_prio,
 367                                      const struct timespec *abs_timeout)
 368 { }
 369 static inline void audit_mq_notify(mqd_t mqdes,
 370                                    const struct sigevent *notification)
 371 { }
 372 static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 373 { }
 374 static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 375                                        const struct cred *new,
 376                                        const struct cred *old)
 377 {
 378         return 0;
 379 }
 380 static inline void audit_log_capset(pid_t pid, const struct cred *new,
 381                                    const struct cred *old)
 382 { }
 383 static inline void audit_mmap_fd(int fd, int flags)
 384 { }
 385 static inline void audit_ptrace(struct task_struct *t)
 386 { }
 387 #define audit_n_rules 0
 388 #define audit_signals 0
 389 #endif /* CONFIG_AUDITSYSCALL */
 390
 391 #ifdef CONFIG_AUDIT
 392 /* These are defined in audit.c */
 393                                 /* Public API */
 394 extern __printf(4, 5)
 395 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 396                const char *fmt, ...);
 397
 398 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
 399 extern __printf(2, 3)
 400 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
 401 extern void                 audit_log_end(struct audit_buffer *ab);
 402 extern int                  audit_string_contains_control(const char *string,
 403                                                           size_t len);
 404 extern void                 audit_log_n_hex(struct audit_buffer *ab,
 405                                           const unsigned char *buf,
 406                                           size_t len);
 407 extern void                 audit_log_n_string(struct audit_buffer *ab,
 408                                                const char *buf,
 409                                                size_t n);
 410 extern void                 audit_log_n_untrustedstring(struct audit_buffer *ab,
 411                                                         const char *string,
 412                                                         size_t n);
 413 extern void                 audit_log_untrustedstring(struct audit_buffer *ab,
 414                                                       const char *string);
 415 extern void                 audit_log_d_path(struct audit_buffer *ab,
 416                                              const char *prefix,
 417                                              const struct path *path);
 418 extern void                 audit_log_key(struct audit_buffer *ab,
 419                                           char *key);
 420 extern void                 audit_log_link_denied(const char *operation,
 421                                                   struct path *link);
 422 extern void                 audit_log_lost(const char *message);
 423 #ifdef CONFIG_SECURITY
 424 extern void                 audit_log_secctx(struct audit_buffer *ab, u32 secid);
 425 #else
 426 static inline void          audit_log_secctx(struct audit_buffer *ab, u32 secid)
 427 { }
 428 #endif
 429
 430 extern int                  audit_update_lsm_rules(void);
 431
 432                                 /* Private API (for audit.c only) */
 433 extern int audit_filter_user(void);
 434 extern int audit_filter_type(int type);
 435 extern int  audit_receive_filter(int type, int pid, int seq,
 436                                 void *data, size_t datasz, kuid_t loginuid,
 437                                 u32 sessionid, u32 sid);
 438 extern int audit_enabled;
 439 #else /* CONFIG_AUDIT */
 440 static inline __printf(4, 5)
 441 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 442                const char *fmt, ...)
 443 { }
 444 static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
 445                                                    gfp_t gfp_mask, int type)
 446 {
 447         return NULL;
 448 }
 449 static inline __printf(2, 3)
 450 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
 451 { }
 452 static inline void audit_log_end(struct audit_buffer *ab)
 453 { }
 454 static inline void audit_log_n_hex(struct audit_buffer *ab,
 455                                    const unsigned char *buf, size_t len)
 456 { }
 457 static inline void audit_log_n_string(struct audit_buffer *ab,
 458                                       const char *buf, size_t n)
 459 { }
 460 static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
 461                                                 const char *string, size_t n)
 462 { }
 463 static inline void audit_log_untrustedstring(struct audit_buffer *ab,
 464                                              const char *string)
 465 { }
 466 static inline void audit_log_d_path(struct audit_buffer *ab,
 467                                     const char *prefix,
 468                                     const struct path *path)
 469 { }
 470 static inline void audit_log_key(struct audit_buffer *ab, char *key)
 471 { }
 472 static inline void audit_log_link_denied(const char *string,
 473                                          const struct path *link)
 474 { }
 475 static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
 476 { }
 477 #define audit_enabled 0
 478 #endif /* CONFIG_AUDIT */
 479 static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 480 {
 481         audit_log_n_string(ab, buf, strlen(buf));
 482 }
 483
 484 #endif