LXR linux/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
  30struct audit_sig_info {
  31        uid_t           uid;
  32        pid_t           pid;
  33        char            ctx[0];
  34};
  35
  36struct audit_buffer;
  37struct audit_context;
  38struct inode;
  39struct netlink_skb_parms;
  40struct path;
  41struct linux_binprm;
  42struct mq_attr;
  43struct mqstat;
  44struct audit_watch;
  45struct audit_tree;
  46
  47struct 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
  66struct 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
  76extern int __init audit_register_class(int class, unsigned *list);
  77extern int audit_classify_syscall(int abi, unsigned syscall);
  78extern 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
  90struct filename;
  91
  92extern void audit_log_session_info(struct audit_buffer *ab);
  93
  94#ifdef CONFIG_AUDITSYSCALL
  95/* These are defined in auditsc.c */
  96                                /* Public API */
  97extern int  audit_alloc(struct task_struct *task);
  98extern void __audit_free(struct task_struct *task);
  99extern void __audit_syscall_entry(int arch,
 100                                  int major, unsigned long a0, unsigned long a1,
 101                                  unsigned long a2, unsigned long a3);
 102extern void __audit_syscall_exit(int ret_success, long ret_value);
 103extern struct filename *__audit_reusename(const __user char *uptr);
 104extern void __audit_getname(struct filename *name);
 105extern void audit_putname(struct filename *name);
 106extern void __audit_inode(struct filename *name, const struct dentry *dentry,
 107                                unsigned int parent);
 108extern void __audit_inode_child(const struct inode *parent,
 109                                const struct dentry *dentry,
 110                                const unsigned char type);
 111extern void __audit_seccomp(unsigned long syscall, long signr, int code);
 112extern void __audit_ptrace(struct task_struct *t);
 113
 114static inline int audit_dummy_context(void)
 115{
 116        void *p = current->audit_context;
 117        return !p || *(int *)p;
 118}
 119static inline void audit_free(struct task_struct *task)
 120{
 121        if (unlikely(task->audit_context))
 122                __audit_free(task);
 123}
 124static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 125                                       unsigned long a1, unsigned long a2,
 126                                       unsigned long a3)
 127{
 128        if (unlikely(current->audit_context))
 129                __audit_syscall_entry(arch, major, a0, a1, a2, a3);
 130}
 131static inline void audit_syscall_exit(void *pt_regs)
 132{
 133        if (unlikely(current->audit_context)) {
 134                int success = is_syscall_success(pt_regs);
 135                int return_code = regs_return_value(pt_regs);
 136
 137                __audit_syscall_exit(success, return_code);
 138        }
 139}
 140static inline struct filename *audit_reusename(const __user char *name)
 141{
 142        if (unlikely(!audit_dummy_context()))
 143                return __audit_reusename(name);
 144        return NULL;
 145}
 146static inline void audit_getname(struct filename *name)
 147{
 148        if (unlikely(!audit_dummy_context()))
 149                __audit_getname(name);
 150}
 151static inline void audit_inode(struct filename *name, const struct dentry *dentry,
 152                                unsigned int parent) {
 153        if (unlikely(!audit_dummy_context()))
 154                __audit_inode(name, dentry, parent);
 155}
 156static inline void audit_inode_child(const struct inode *parent,
 157                                     const struct dentry *dentry,
 158                                     const unsigned char type) {
 159        if (unlikely(!audit_dummy_context()))
 160                __audit_inode_child(parent, dentry, type);
 161}
 162void audit_core_dumps(long signr);
 163
 164static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 165{
 166        /* Force a record to be reported if a signal was delivered. */
 167        if (signr || unlikely(!audit_dummy_context()))
 168                __audit_seccomp(syscall, signr, code);
 169}
 170
 171static inline void audit_ptrace(struct task_struct *t)
 172{
 173        if (unlikely(!audit_dummy_context()))
 174                __audit_ptrace(t);
 175}
 176
 177                                /* Private API (for audit.c only) */
 178extern unsigned int audit_serial(void);
 179extern int auditsc_get_stamp(struct audit_context *ctx,
 180                              struct timespec *t, unsigned int *serial);
 181extern int audit_set_loginuid(kuid_t loginuid);
 182
 183static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 184{
 185        return tsk->loginuid;
 186}
 187
 188static inline int audit_get_sessionid(struct task_struct *tsk)
 189{
 190        return tsk->sessionid;
 191}
 192
 193extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 194extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
 195extern int __audit_bprm(struct linux_binprm *bprm);
 196extern int __audit_socketcall(int nargs, unsigned long *args);
 197extern int __audit_sockaddr(int len, void *addr);
 198extern void __audit_fd_pair(int fd1, int fd2);
 199extern void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr);
 200extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
 201extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
 202extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
 203extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 204                                  const struct cred *new,
 205                                  const struct cred *old);
 206extern void __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
 207extern void __audit_mmap_fd(int fd, int flags);
 208
 209static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 210{
 211        if (unlikely(!audit_dummy_context()))
 212                __audit_ipc_obj(ipcp);
 213}
 214static inline void audit_fd_pair(int fd1, int fd2)
 215{
 216        if (unlikely(!audit_dummy_context()))
 217                __audit_fd_pair(fd1, fd2);
 218}
 219static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 220{
 221        if (unlikely(!audit_dummy_context()))
 222                __audit_ipc_set_perm(qbytes, uid, gid, mode);
 223}
 224static inline int audit_bprm(struct linux_binprm *bprm)
 225{
 226        if (unlikely(!audit_dummy_context()))
 227                return __audit_bprm(bprm);
 228        return 0;
 229}
 230static inline int audit_socketcall(int nargs, unsigned long *args)
 231{
 232        if (unlikely(!audit_dummy_context()))
 233                return __audit_socketcall(nargs, args);
 234        return 0;
 235}
 236static inline int audit_sockaddr(int len, void *addr)
 237{
 238        if (unlikely(!audit_dummy_context()))
 239                return __audit_sockaddr(len, addr);
 240        return 0;
 241}
 242static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 243{
 244        if (unlikely(!audit_dummy_context()))
 245                __audit_mq_open(oflag, mode, attr);
 246}
 247static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
 248{
 249        if (unlikely(!audit_dummy_context()))
 250                __audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
 251}
 252static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 253{
 254        if (unlikely(!audit_dummy_context()))
 255                __audit_mq_notify(mqdes, notification);
 256}
 257static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 258{
 259        if (unlikely(!audit_dummy_context()))
 260                __audit_mq_getsetattr(mqdes, mqstat);
 261}
 262
 263static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 264                                       const struct cred *new,
 265                                       const struct cred *old)
 266{
 267        if (unlikely(!audit_dummy_context()))
 268                return __audit_log_bprm_fcaps(bprm, new, old);
 269        return 0;
 270}
 271
 272static inline void audit_log_capset(pid_t pid, const struct cred *new,
 273                                   const struct cred *old)
 274{
 275        if (unlikely(!audit_dummy_context()))
 276                __audit_log_capset(pid, new, old);
 277}
 278
 279static inline void audit_mmap_fd(int fd, int flags)
 280{
 281        if (unlikely(!audit_dummy_context()))
 282                __audit_mmap_fd(fd, flags);
 283}
 284
 285extern int audit_n_rules;
 286extern int audit_signals;
 287#else /* CONFIG_AUDITSYSCALL */
 288static inline int audit_alloc(struct task_struct *task)
 289{
 290        return 0;
 291}
 292static inline void audit_free(struct task_struct *task)
 293{ }
 294static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
 295                                       unsigned long a1, unsigned long a2,
 296                                       unsigned long a3)
 297{ }
 298static inline void audit_syscall_exit(void *pt_regs)
 299{ }
 300static inline int audit_dummy_context(void)
 301{
 302        return 1;
 303}
 304static inline struct filename *audit_reusename(const __user char *name)
 305{
 306        return NULL;
 307}
 308static inline void audit_getname(struct filename *name)
 309{ }
 310static inline void audit_putname(struct filename *name)
 311{ }
 312static inline void __audit_inode(struct filename *name,
 313                                        const struct dentry *dentry,
 314                                        unsigned int parent)
 315{ }
 316static inline void __audit_inode_child(const struct inode *parent,
 317                                        const struct dentry *dentry,
 318                                        const unsigned char type)
 319{ }
 320static inline void audit_inode(struct filename *name,
 321                                const struct dentry *dentry,
 322                                unsigned int parent)
 323{ }
 324static inline void audit_inode_child(const struct inode *parent,
 325                                     const struct dentry *dentry,
 326                                     const unsigned char type)
 327{ }
 328static inline void audit_core_dumps(long signr)
 329{ }
 330static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
 331{ }
 332static inline void audit_seccomp(unsigned long syscall, long signr, int code)
 333{ }
 334static inline int auditsc_get_stamp(struct audit_context *ctx,
 335                              struct timespec *t, unsigned int *serial)
 336{
 337        return 0;
 338}
 339static inline kuid_t audit_get_loginuid(struct task_struct *tsk)
 340{
 341        return INVALID_UID;
 342}
 343static inline int audit_get_sessionid(struct task_struct *tsk)
 344{
 345        return -1;
 346}
 347static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 348{ }
 349static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,
 350                                        gid_t gid, umode_t mode)
 351{ }
 352static inline int audit_bprm(struct linux_binprm *bprm)
 353{
 354        return 0;
 355}
 356static inline int audit_socketcall(int nargs, unsigned long *args)
 357{
 358        return 0;
 359}
 360static inline void audit_fd_pair(int fd1, int fd2)
 361{ }
 362static inline int audit_sockaddr(int len, void *addr)
 363{
 364        return 0;
 365}
 366static inline void audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 367{ }
 368static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len,
 369                                     unsigned int msg_prio,
 370                                     const struct timespec *abs_timeout)
 371{ }
 372static inline void audit_mq_notify(mqd_t mqdes,
 373                                   const struct sigevent *notification)
 374{ }
 375static inline void audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 376{ }
 377static inline int audit_log_bprm_fcaps(struct linux_binprm *bprm,
 378                                       const struct cred *new,
 379                                       const struct cred *old)
 380{
 381        return 0;
 382}
 383static inline void audit_log_capset(pid_t pid, const struct cred *new,
 384                                   const struct cred *old)
 385{ }
 386static inline void audit_mmap_fd(int fd, int flags)
 387{ }
 388static inline void audit_ptrace(struct task_struct *t)
 389{ }
 390#define audit_n_rules 0
 391#define audit_signals 0
 392#endif /* CONFIG_AUDITSYSCALL */
 393
 394static inline bool audit_loginuid_set(struct task_struct *tsk)
 395{
 396        return uid_valid(audit_get_loginuid(tsk));
 397}
 398
 399#ifdef CONFIG_AUDIT
 400/* These are defined in audit.c */
 401                                /* Public API */
 402extern __printf(4, 5)
 403void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 404               const char *fmt, ...);
 405
 406extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type);
 407extern __printf(2, 3)
 408void audit_log_format(struct audit_buffer *ab, const char *fmt, ...);
 409extern void                 audit_log_end(struct audit_buffer *ab);
 410extern int                  audit_string_contains_control(const char *string,
 411                                                          size_t len);
 412extern void                 audit_log_n_hex(struct audit_buffer *ab,
 413                                          const unsigned char *buf,
 414                                          size_t len);
 415extern void                 audit_log_n_string(struct audit_buffer *ab,
 416                                               const char *buf,
 417                                               size_t n);
 418extern void                 audit_log_n_untrustedstring(struct audit_buffer *ab,
 419                                                        const char *string,
 420                                                        size_t n);
 421extern void                 audit_log_untrustedstring(struct audit_buffer *ab,
 422                                                      const char *string);
 423extern void                 audit_log_d_path(struct audit_buffer *ab,
 424                                             const char *prefix,
 425                                             const struct path *path);
 426extern void                 audit_log_key(struct audit_buffer *ab,
 427                                          char *key);
 428extern void                 audit_log_link_denied(const char *operation,
 429                                                  struct path *link);
 430extern void                 audit_log_lost(const char *message);
 431#ifdef CONFIG_SECURITY
 432extern void                 audit_log_secctx(struct audit_buffer *ab, u32 secid);
 433#else
 434static inline void          audit_log_secctx(struct audit_buffer *ab, u32 secid)
 435{ }
 436#endif
 437
 438extern int audit_log_task_context(struct audit_buffer *ab);
 439extern void audit_log_task_info(struct audit_buffer *ab,
 440                                struct task_struct *tsk);
 441
 442extern int                  audit_update_lsm_rules(void);
 443
 444                                /* Private API (for audit.c only) */
 445extern int audit_filter_user(int type);
 446extern int audit_filter_type(int type);
 447extern int  audit_receive_filter(int type, int pid, int seq,
 448                                void *data, size_t datasz);
 449extern int audit_enabled;
 450#else /* CONFIG_AUDIT */
 451static inline __printf(4, 5)
 452void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 453               const char *fmt, ...)
 454{ }
 455static inline struct audit_buffer *audit_log_start(struct audit_context *ctx,
 456                                                   gfp_t gfp_mask, int type)
 457{
 458        return NULL;
 459}
 460static inline __printf(2, 3)
 461void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
 462{ }
 463static inline void audit_log_end(struct audit_buffer *ab)
 464{ }
 465static inline void audit_log_n_hex(struct audit_buffer *ab,
 466                                   const unsigned char *buf, size_t len)
 467{ }
 468static inline void audit_log_n_string(struct audit_buffer *ab,
 469                                      const char *buf, size_t n)
 470{ }
 471static inline void  audit_log_n_untrustedstring(struct audit_buffer *ab,
 472                                                const char *string, size_t n)
 473{ }
 474static inline void audit_log_untrustedstring(struct audit_buffer *ab,
 475                                             const char *string)
 476{ }
 477static inline void audit_log_d_path(struct audit_buffer *ab,
 478                                    const char *prefix,
 479                                    const struct path *path)
 480{ }
 481static inline void audit_log_key(struct audit_buffer *ab, char *key)
 482{ }
 483static inline void audit_log_link_denied(const char *string,
 484                                         const struct path *link)
 485{ }
 486static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
 487{ }
 488static inline int audit_log_task_context(struct audit_buffer *ab)
 489{
 490        return 0;
 491}
 492static inline void audit_log_task_info(struct audit_buffer *ab,
 493                                       struct task_struct *tsk)
 494{ }
 495#define audit_enabled 0
 496#endif /* CONFIG_AUDIT */
 497static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
 498{
 499        audit_log_n_string(ab, buf, strlen(buf));
 500}
 501
 502#endif
 503