bsd/bsm/audit_kernel.h

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