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