bsd/bsm/audit_kernel.h

   1 /*
   2  * @APPLE_LICENSE_HEADER_START@
   3  *
   4  * Copyright (c) 1999-2004 Apple Computer, Inc.  All Rights Reserved.
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef _BSM_AUDIT_KERNEL_H
  25 #define _BSM_AUDIT_KERNEL_H
  26
  27 #ifdef KERNEL
  28
  29 #include <bsm/audit.h>
  30
  31 #include <sys/sysctl.h>
  32 #include <sys/user.h>
  33 #include <sys/ipc.h>
  34
  35 /*
  36  * Audit subsystem condition flags.  The audit_enabled flag is set and
  37  * removed automatically as a result of configuring log files, and
  38  * can be observed but should not be directly manipulated.  The audit
  39  * suspension flag permits audit to be temporarily disabled without
  40  * reconfiguring the audit target.
  41  */
  42 extern int      audit_enabled;
  43 extern int      audit_suspended;
  44
  45 #define BSM_SUCCESS             0
  46 #define BSM_FAILURE             1
  47 #define BSM_NOAUDIT             2
  48
  49 /*
  50  * Define the masks for the audited arguments.
  51  */
  52 #define ARG_EUID                0x0000000000000001ULL
  53 #define ARG_RUID                0x0000000000000002ULL
  54 #define ARG_SUID                0x0000000000000004ULL
  55 #define ARG_EGID                0x0000000000000008ULL
  56 #define ARG_RGID                0x0000000000000010ULL
  57 #define ARG_SGID                0x0000000000000020ULL
  58 #define ARG_PID                 0x0000000000000040ULL
  59 #define ARG_UID                 0x0000000000000080ULL
  60 #define ARG_AUID                0x0000000000000100ULL
  61 #define ARG_GID                 0x0000000000000200ULL
  62 #define ARG_FD                  0x0000000000000400ULL
  63 #define ARG_POSIX_IPC_PERM      0x0000000000000800ULL
  64 #define ARG_FFLAGS              0x0000000000001000ULL
  65 #define ARG_MODE                0x0000000000002000ULL
  66 #define ARG_DEV                 0x0000000000004000ULL
  67 #define ARG_ADDR                0x0000000000008000ULL
  68 #define ARG_LEN                 0x0000000000010000ULL
  69 #define ARG_MASK                0x0000000000020000ULL
  70 #define ARG_SIGNUM              0x0000000000040000ULL
  71 #define ARG_LOGIN               0x0000000000080000ULL
  72 #define ARG_SADDRINET           0x0000000000100000ULL
  73 #define ARG_SADDRINET6          0x0000000000200000ULL
  74 #define ARG_SADDRUNIX           0x0000000000400000ULL
  75 #define ARG_KPATH1              0x0000000000800000ULL
  76 #define ARG_KPATH2              0x0000000001000000ULL
  77 #define ARG_UPATH1              0x0000000002000000ULL
  78 #define ARG_UPATH2              0x0000000004000000ULL
  79 #define ARG_TEXT                0x0000000008000000ULL
  80 #define ARG_VNODE1              0x0000000010000000ULL
  81 #define ARG_VNODE2              0x0000000020000000ULL
  82 #define ARG_SVIPC_CMD           0x0000000040000000ULL
  83 #define ARG_SVIPC_PERM          0x0000000080000000ULL
  84 #define ARG_SVIPC_ID            0x0000000100000000ULL
  85 #define ARG_SVIPC_ADDR          0x0000000200000000ULL
  86 #define ARG_GROUPSET            0x0000000400000000ULL
  87 #define ARG_CMD                 0x0000000800000000ULL
  88 #define ARG_SOCKINFO            0x0000001000000000ULL
  89 #define ARG_ASID                0x0000002000000000ULL
  90 #define ARG_TERMID              0x0000004000000000ULL
  91 #define ARG_AUDITON             0x0000008000000000ULL
  92 #define ARG_VALUE               0x0000010000000000ULL
  93 #define ARG_AMASK               0x0000020000000000ULL
  94 #define ARG_CTLNAME             0x0000040000000000ULL
  95 #define ARG_PROCESS             0x0000080000000000ULL
  96 #define ARG_MACHPORT1           0x0000100000000000ULL
  97 #define ARG_MACHPORT2           0x0000200000000000ULL
  98 #define ARG_NONE                0x0000000000000000ULL
  99 #define ARG_ALL                 0xFFFFFFFFFFFFFFFFULL
 100
 101 /* Defines for the kernel audit record k_ar_commit field */
 102 #define AR_COMMIT_KERNEL        0x00000001U
 103 #define AR_COMMIT_USER          0x00000010U
 104
 105 struct vnode_au_info {
 106         mode_t          vn_mode;
 107         uid_t           vn_uid;
 108         gid_t           vn_gid;
 109         dev_t           vn_dev;
 110         long            vn_fsid;
 111         long            vn_fileid;
 112         long            vn_gen;
 113 };
 114
 115 struct groupset {
 116         gid_t   gidset[NGROUPS];
 117         u_int   gidset_size;
 118 };
 119
 120 struct socket_au_info {
 121         int             so_domain;
 122         int             so_type;
 123         int             so_protocol;
 124         in_addr_t       so_raddr;       /* remote address if INET socket */
 125         in_addr_t       so_laddr;       /* local address if INET socket */
 126         u_short         so_rport;       /* remote port */
 127         u_short         so_lport;       /* local port */
 128 };
 129
 130 union auditon_udata {
 131         char                    au_path[MAXPATHLEN];
 132         long                    au_cond;
 133         long                    au_flags;
 134         long                    au_policy;
 135         au_evclass_map_t        au_evclass;
 136         au_mask_t               au_mask;
 137         auditinfo_t             au_auinfo;
 138         auditpinfo_t            au_aupinfo;
 139         auditpinfo_addr_t       au_aupinfo_addr;
 140         au_qctrl_t              au_qctrl;
 141         au_stat_t               au_stat;
 142         au_fstat_t              au_fstat;
 143 };
 144
 145 struct posix_ipc_perm {
 146         uid_t                   pipc_uid;
 147         gid_t                   pipc_gid;
 148         mode_t                  pipc_mode;
 149 };
 150
 151 struct audit_record {
 152         /* Audit record header. */
 153         u_int32_t               ar_magic;
 154         int                     ar_event;
 155         int                     ar_retval; /* value returned to the process */
 156         int                     ar_errno;  /* return status of system call */
 157         struct timespec         ar_starttime;
 158         struct timespec         ar_endtime;
 159         u_int64_t               ar_valid_arg;  /* Bitmask of valid arguments */
 160
 161         /* Audit subject information. */
 162         struct xucred                   ar_subj_cred;
 163         uid_t                           ar_subj_ruid;
 164         gid_t                           ar_subj_rgid;
 165         gid_t                           ar_subj_egid;
 166         uid_t                           ar_subj_auid; /* Audit user ID */
 167         pid_t                           ar_subj_asid; /* Audit session ID */
 168         pid_t                           ar_subj_pid;
 169         struct au_tid                   ar_subj_term;
 170         char                            ar_subj_comm[MAXCOMLEN + 1];
 171         struct au_mask                  ar_subj_amask;
 172
 173         /* Operation arguments. */
 174         uid_t                           ar_arg_euid;
 175         uid_t                           ar_arg_ruid;
 176         uid_t                           ar_arg_suid;
 177         gid_t                           ar_arg_egid;
 178         gid_t                           ar_arg_rgid;
 179         gid_t                           ar_arg_sgid;
 180         pid_t                           ar_arg_pid;
 181         pid_t                           ar_arg_asid;
 182         struct au_tid                   ar_arg_termid;
 183         uid_t                           ar_arg_uid;
 184         uid_t                           ar_arg_auid;
 185         gid_t                           ar_arg_gid;
 186         struct groupset                 ar_arg_groups;
 187         int                             ar_arg_fd;
 188         int                             ar_arg_fflags;
 189         mode_t                          ar_arg_mode;
 190         int                             ar_arg_dev;
 191         long                            ar_arg_value;
 192         void *                          ar_arg_addr;
 193         int                             ar_arg_len;
 194         int                             ar_arg_mask;
 195         u_int                           ar_arg_signum;
 196         char                            ar_arg_login[MAXLOGNAME];
 197         int                             ar_arg_ctlname[CTL_MAXNAME];
 198         struct sockaddr                 ar_arg_sockaddr;
 199         struct socket_au_info           ar_arg_sockinfo;
 200         char                            *ar_arg_upath1;
 201         char                            *ar_arg_upath2;
 202         char                            *ar_arg_kpath1;
 203         char                            *ar_arg_kpath2;
 204         char                            *ar_arg_text;
 205         struct au_mask                  ar_arg_amask;
 206         struct vnode_au_info            ar_arg_vnode1;
 207         struct vnode_au_info            ar_arg_vnode2;
 208         int                             ar_arg_cmd;
 209         int                             ar_arg_svipc_cmd;
 210         struct ipc_perm                 ar_arg_svipc_perm;
 211         int                             ar_arg_svipc_id;
 212         void *                          ar_arg_svipc_addr;
 213         struct posix_ipc_perm           ar_arg_pipc_perm;
 214         mach_port_name_t                ar_arg_mach_port1;
 215         mach_port_name_t                ar_arg_mach_port2;
 216         union auditon_udata             ar_arg_auditon;
 217 };
 218
 219 /*
 220  * In-kernel version of audit record; the basic record plus queue meta-data.
 221  * This record can also have a pointer set to some opaque data that will
 222  * be passed through to the audit writing mechanism.
 223  */
 224 struct kaudit_record {
 225         struct audit_record             k_ar;
 226         u_int32_t                       k_ar_commit;
 227         void                            *k_udata;    /* user data */
 228         u_int                           k_ulen;     /* user data length */
 229         struct uthread                  *k_uthread; /* thread we are auditing */
 230         TAILQ_ENTRY(kaudit_record)      k_q;
 231 };
 232
 233 struct proc;
 234 struct vnode;
 235 struct componentname;
 236
 237 void                     audit_abort(struct kaudit_record *ar);
 238 void                     audit_commit(struct kaudit_record *ar, int error,
 239                                         int retval);
 240 void                     audit_init(void);
 241 void                     audit_shutdown(void);
 242
 243 struct kaudit_record    *audit_new(int event, struct proc *p,
 244                             struct uthread *uthread);
 245
 246 void                     audit_syscall_enter(unsigned short code,
 247                                 struct proc *proc, struct uthread *uthread);
 248 void                     audit_syscall_exit(int error, struct proc *proc,
 249                                 struct uthread *uthread);
 250 void                     audit_mach_syscall_enter(unsigned short audit_event);
 251 void                     audit_mach_syscall_exit(int retval,
 252                                 struct uthread *uthread);
 253
 254 int                     kaudit_to_bsm(struct kaudit_record *kar,
 255                                         struct au_record **pau);
 256
 257 int                     bsm_rec_verify(void *rec);
 258
 259 /*
 260  * Kernel versions of the BSM audit record functions.
 261  */
 262 struct au_record        *kau_open(void);
 263 int                     kau_write(struct au_record *rec, token_t *m);
 264 int                     kau_close(struct au_record *rec,
 265                                  struct timespec *endtime, short event);
 266 void                    kau_free(struct au_record *rec);
 267 void                    kau_init(void);
 268 token_t                 *kau_to_file(const char *file, const struct timeval *tv);
 269 token_t                 *kau_to_header(const struct timespec *ctime, int rec_size,
 270                                         au_event_t e_type, au_emod_t e_mod);
 271 token_t                 *kau_to_header32(const struct timespec *ctime, int rec_size,
 272                                         au_event_t e_type, au_emod_t e_mod);
 273 token_t                 *kau_to_header64(const struct timespec *ctime, int rec_size,
 274                                          au_event_t e_type, au_emod_t e_mod);
 275 /*
 276  * The remaining kernel functions are conditionally compiled in as they
 277  * are wrapped by a macro, and the macro should be the only place in
 278  * the source tree where these functions are referenced.
 279  */
 280 #ifdef AUDIT
 281 void                     audit_arg_addr(user_addr_t addr);
 282 void                     audit_arg_len(user_size_t len);
 283 void                     audit_arg_fd(int fd);
 284 void                     audit_arg_fflags(int fflags);
 285 void                     audit_arg_gid(gid_t gid, gid_t egid, gid_t rgid,
 286                                         gid_t sgid);
 287 void                     audit_arg_uid(uid_t uid, uid_t euid, uid_t ruid,
 288                                         uid_t suid);
 289 void                     audit_arg_groupset(const gid_t *gidset, u_int gidset_size);
 290 void                     audit_arg_login(const char *login);
 291 void                     audit_arg_ctlname(const int *name, int namelen);
 292 void                     audit_arg_mask(int mask);
 293 void                     audit_arg_mode(mode_t mode);
 294 void                     audit_arg_dev(int dev);
 295 void                     audit_arg_value(long value);
 296 void                     audit_arg_owner(uid_t uid, gid_t gid);
 297 void                     audit_arg_pid(pid_t pid);
 298 void                     audit_arg_process(struct proc *p);
 299 void                     audit_arg_signum(u_int signum);
 300 void                     audit_arg_socket(int sodomain, int sotype,
 301                                                 int soprotocol);
 302 void                     audit_arg_sockaddr(struct proc *p,
 303                                                 struct sockaddr *so);
 304 void                     audit_arg_auid(uid_t auid);
 305 void                     audit_arg_auditinfo(const struct auditinfo *au_info);
 306 void                     audit_arg_upath(struct proc *p, char *upath,
 307                                          u_int64_t flags);
 308 void                     audit_arg_vnpath(struct vnode *vp, u_int64_t flags);
 309 void                     audit_arg_vnpath_withref(struct vnode *vp, u_int64_t flags);
 310 void                     audit_arg_text(const char *text);
 311 void                     audit_arg_cmd(int cmd);
 312 void                     audit_arg_svipc_cmd(int cmd);
 313 void                     audit_arg_svipc_perm(const struct ipc_perm *perm);
 314 void                     audit_arg_svipc_id(int id);
 315 void                     audit_arg_svipc_addr(void *addr);
 316 void                     audit_arg_posix_ipc_perm(uid_t uid, gid_t gid,
 317                                                  mode_t mode);
 318 void                     audit_arg_auditon(const union auditon_udata *udata);
 319 void                     audit_arg_file(struct proc *p, const struct fileproc *fp);
 320 void                     audit_arg_mach_port1(mach_port_name_t port);
 321 void                     audit_arg_mach_port2(mach_port_name_t port);
 322
 323 void                     audit_sysclose(struct proc *p, int fd);
 324
 325 void                     audit_proc_init(struct proc *p);
 326 void                     audit_proc_fork(struct proc *parent,
 327                                          struct proc *child);
 328 void                     audit_proc_free(struct proc *p);
 329
 330 /*
 331  * Define a macro to wrap the audit_arg_* calls by checking the global
 332  * audit_enabled flag before performing the actual call.
 333  */
 334 #define AUDIT_ARG(op, args...)  do {                                    \
 335         if (audit_enabled)                                              \
 336                 audit_arg_ ## op (args);                                \
 337         } while (0)
 338
 339 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 340         if (audit_enabled) {                                            \
 341                 audit_syscall_enter(args);                              \
 342         }                                                               \
 343         } while (0)
 344
 345 /*
 346  * Wrap the audit_syscall_exit() function so that it is called only when
 347  * auditing is enabled, or we have a audit record on the thread. It is
 348  * possible that an audit record was begun before auditing was turned off.
 349  */
 350 #define AUDIT_SYSCALL_EXIT(error, proc, uthread)        do {            \
 351         if (audit_enabled || (uthread->uu_ar != NULL)) {                        \
 352                 audit_syscall_exit(error, proc, uthread);               \
 353         }                                                               \
 354         } while (0)
 355
 356 /*
 357  * Wrap the audit_mach_syscall_enter() and audit_mach_syscall_exit()
 358  * functions in a manner similar to other system call enter/exit functions.
 359  */
 360 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 361         if (audit_enabled) {                                            \
 362                 audit_mach_syscall_enter(args);                         \
 363         }                                                               \
 364         } while (0)
 365
 366 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 367         struct uthread *__uthread = get_bsdthread_info(current_thread());       \
 368         if (audit_enabled || (__uthread->uu_ar != NULL)) {                      \
 369                 audit_mach_syscall_exit(retval, __uthread);             \
 370         }                                                               \
 371         } while (0)
 372
 373 /*
 374  * A Macro to wrap the audit_sysclose() function.
 375  */
 376 #define AUDIT_SYSCLOSE(args...) do {                                    \
 377         if (audit_enabled)                                              \
 378                 audit_sysclose(args);                                   \
 379         } while (0)
 380
 381 #else /* !AUDIT */
 382 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 383         } while (0)
 384
 385 #define AUDIT_SYSCALL_EXIT(error, proc, uthread)        do {            \
 386         } while (0)
 387
 388 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 389         } while (0)
 390
 391 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 392         } while (0)
 393
 394 #define AUDIT_SYSCLOSE(op, args...)     do {                            \
 395         } while (0)
 396
 397 #endif /* AUDIT */
 398
 399 #endif /* KERNEL */
 400
 401 #endif /* !_BSM_AUDIT_KERNEL_H */