2 * Copyright (c) 1999-2009 Apple Inc.
3 * Copyright (c) 2016-2017 Robert N. M. Watson
6 * Portions of this software were developed by BAE Systems, the University of
7 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
8 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
9 * Computing (TC) research program.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
20 * its contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
27 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
39 * This include file contains function prototypes and type definitions used
40 * within the audit implementation.
43 #ifndef _SECURITY_AUDIT_PRIVATE_H_
44 #define _SECURITY_AUDIT_PRIVATE_H_
47 #error "no user-serviceable parts inside"
50 #include <sys/caprights.h>
52 #include <sys/socket.h>
53 #include <sys/ucred.h>
56 MALLOC_DECLARE(M_AUDITBSM);
57 MALLOC_DECLARE(M_AUDITDATA);
58 MALLOC_DECLARE(M_AUDITPATH);
59 MALLOC_DECLARE(M_AUDITTEXT);
60 MALLOC_DECLARE(M_AUDITGIDSET);
64 * Audit control variables that are usually set/read via system calls and
65 * used to control various aspects of auditing.
67 extern struct au_qctrl audit_qctrl;
68 extern struct audit_fstat audit_fstat;
69 extern struct au_mask audit_nae_mask;
70 extern int audit_panic_on_write_fail;
71 extern int audit_fail_stop;
72 extern int audit_argv;
73 extern int audit_arge;
76 * Success/failure conditions for the conversion of a kernel audit record to
84 * Defines for the kernel audit record k_ar_commit field. Flags are set to
85 * indicate what sort of record it is, and which preselection mechanism
88 #define AR_COMMIT_KERNEL 0x00000001U
89 #define AR_COMMIT_USER 0x00000010U
91 #define AR_PRESELECT_TRAIL 0x00001000U
92 #define AR_PRESELECT_PIPE 0x00002000U
94 #define AR_PRESELECT_USER_TRAIL 0x00004000U
95 #define AR_PRESELECT_USER_PIPE 0x00008000U
97 #define AR_PRESELECT_DTRACE 0x00010000U
100 * Audit data is generated as a stream of struct audit_record structures,
101 * linked by struct kaudit_record, and contain storage for possible audit so
102 * that it will not need to be allocated during the processing of a system
103 * call, both improving efficiency and avoiding sleeping at untimely moments.
104 * This structure is converted to BSM format before being written to disk.
106 struct vnode_au_info {
110 u_int32_t vn_dev; /* XXX dev_t compatibility */
111 long vn_fsid; /* XXX uint64_t compatibility */
112 long vn_fileid; /* XXX ino_t compatibility */
121 struct socket_au_info {
125 in_addr_t so_raddr; /* Remote address if INET socket. */
126 in_addr_t so_laddr; /* Local address if INET socket. */
127 u_short so_rport; /* Remote port. */
128 u_short so_lport; /* Local port. */
132 * The following is used for A_OLDSETQCTRL and AU_OLDGETQCTRL and a 64-bit
136 u_int64_t aq64_hiwater;
137 u_int64_t aq64_lowater;
138 u_int64_t aq64_bufsz;
139 u_int64_t aq64_delay;
140 u_int64_t aq64_minfree;
142 typedef struct au_qctrl64 au_qctrl64_t;
144 union auditon_udata {
152 au_evclass_map_t au_evclass;
154 auditinfo_t au_auinfo;
155 auditpinfo_t au_aupinfo;
156 auditpinfo_addr_t au_aupinfo_addr;
158 au_qctrl64_t au_qctrl64;
161 auditinfo_addr_t au_kau_info;
162 au_evname_map_t au_evname;
165 struct posix_ipc_perm {
171 struct audit_record {
172 /* Audit record header. */
175 int ar_retval; /* value returned to the process */
176 int ar_errno; /* return status of system call */
177 struct timespec ar_starttime;
178 struct timespec ar_endtime;
179 u_int64_t ar_valid_arg; /* Bitmask of valid arguments */
181 /* Audit subject information. */
182 struct xucred ar_subj_cred;
186 uid_t ar_subj_auid; /* Audit user ID */
187 pid_t ar_subj_asid; /* Audit session ID */
189 struct au_tid ar_subj_term;
190 struct au_tid_addr ar_subj_term_addr;
191 struct au_mask ar_subj_amask;
193 /* Operation arguments. */
202 struct au_tid ar_arg_termid;
203 struct au_tid_addr ar_arg_termid_addr;
207 struct groupset ar_arg_groups;
213 int ar_arg_dev; /* XXX dev_t compatibility */
219 char ar_arg_login[MAXLOGNAME];
220 int ar_arg_ctlname[CTL_MAXNAME];
221 struct socket_au_info ar_arg_sockinfo;
225 struct au_mask ar_arg_amask;
226 struct vnode_au_info ar_arg_vnode1;
227 struct vnode_au_info ar_arg_vnode2;
229 int ar_arg_svipc_which;
230 int ar_arg_svipc_cmd;
231 struct ipc_perm ar_arg_svipc_perm;
233 void *ar_arg_svipc_addr;
234 struct posix_ipc_perm ar_arg_pipc_perm;
235 union auditon_udata ar_arg_auditon;
240 int ar_arg_exitstatus;
241 int ar_arg_exitretval;
242 struct sockaddr_storage ar_arg_sockaddr;
243 cap_rights_t ar_arg_rights;
244 uint32_t ar_arg_fcntl_rights;
245 char ar_jailname[MAXHOSTNAMELEN];
249 * Arguments in the audit record are initially not defined; flags are set to
250 * indicate if they are present so they can be included in the audit log
251 * stream only if defined.
253 #define ARG_EUID 0x0000000000000001ULL
254 #define ARG_RUID 0x0000000000000002ULL
255 #define ARG_SUID 0x0000000000000004ULL
256 #define ARG_EGID 0x0000000000000008ULL
257 #define ARG_RGID 0x0000000000000010ULL
258 #define ARG_SGID 0x0000000000000020ULL
259 #define ARG_PID 0x0000000000000040ULL
260 #define ARG_UID 0x0000000000000080ULL
261 #define ARG_AUID 0x0000000000000100ULL
262 #define ARG_GID 0x0000000000000200ULL
263 #define ARG_FD 0x0000000000000400ULL
264 #define ARG_POSIX_IPC_PERM 0x0000000000000800ULL
265 #define ARG_FFLAGS 0x0000000000001000ULL
266 #define ARG_MODE 0x0000000000002000ULL
267 #define ARG_DEV 0x0000000000004000ULL
268 #define ARG_ADDR 0x0000000000008000ULL
269 #define ARG_LEN 0x0000000000010000ULL
270 #define ARG_MASK 0x0000000000020000ULL
271 #define ARG_SIGNUM 0x0000000000040000ULL
272 #define ARG_LOGIN 0x0000000000080000ULL
273 #define ARG_SADDRINET 0x0000000000100000ULL
274 #define ARG_SADDRINET6 0x0000000000200000ULL
275 #define ARG_SADDRUNIX 0x0000000000400000ULL
276 #define ARG_TERMID_ADDR 0x0000000000400000ULL
277 #define ARG_UNUSED2 0x0000000001000000ULL
278 #define ARG_UPATH1 0x0000000002000000ULL
279 #define ARG_UPATH2 0x0000000004000000ULL
280 #define ARG_TEXT 0x0000000008000000ULL
281 #define ARG_VNODE1 0x0000000010000000ULL
282 #define ARG_VNODE2 0x0000000020000000ULL
283 #define ARG_SVIPC_CMD 0x0000000040000000ULL
284 #define ARG_SVIPC_PERM 0x0000000080000000ULL
285 #define ARG_SVIPC_ID 0x0000000100000000ULL
286 #define ARG_SVIPC_ADDR 0x0000000200000000ULL
287 #define ARG_GROUPSET 0x0000000400000000ULL
288 #define ARG_CMD 0x0000000800000000ULL
289 #define ARG_SOCKINFO 0x0000001000000000ULL
290 #define ARG_ASID 0x0000002000000000ULL
291 #define ARG_TERMID 0x0000004000000000ULL
292 #define ARG_AUDITON 0x0000008000000000ULL
293 #define ARG_VALUE 0x0000010000000000ULL
294 #define ARG_AMASK 0x0000020000000000ULL
295 #define ARG_CTLNAME 0x0000040000000000ULL
296 #define ARG_PROCESS 0x0000080000000000ULL
297 #define ARG_MACHPORT1 0x0000100000000000ULL
298 #define ARG_MACHPORT2 0x0000200000000000ULL
299 #define ARG_EXIT 0x0000400000000000ULL
300 #define ARG_IOVECSTR 0x0000800000000000ULL
301 #define ARG_ARGV 0x0001000000000000ULL
302 #define ARG_ENVV 0x0002000000000000ULL
303 #define ARG_ATFD1 0x0004000000000000ULL
304 #define ARG_ATFD2 0x0008000000000000ULL
305 #define ARG_RIGHTS 0x0010000000000000ULL
306 #define ARG_FCNTL_RIGHTS 0x0020000000000000ULL
307 #define ARG_SVIPC_WHICH 0x0200000000000000ULL
308 #define ARG_NONE 0x0000000000000000ULL
309 #define ARG_ALL 0xFFFFFFFFFFFFFFFFULL
311 #define ARG_IS_VALID(kar, arg) ((kar)->k_ar.ar_valid_arg & (arg))
312 #define ARG_SET_VALID(kar, arg) do { \
313 (kar)->k_ar.ar_valid_arg |= (arg); \
315 #define ARG_CLEAR_VALID(kar, arg) do { \
316 (kar)->k_ar.ar_valid_arg &= ~(arg); \
320 * In-kernel version of audit record; the basic record plus queue meta-data.
321 * This record can also have a pointer set to some opaque data that will be
322 * passed through to the audit writing mechanism.
324 struct kaudit_record {
325 struct audit_record k_ar;
326 u_int32_t k_ar_commit;
327 void *k_udata; /* User data. */
328 u_int k_ulen; /* User data length. */
329 struct uthread *k_uthread; /* Audited thread. */
330 void *k_dtaudit_state;
331 TAILQ_ENTRY(kaudit_record) k_q;
333 TAILQ_HEAD(kaudit_queue, kaudit_record);
336 * Functions to manage the allocation, release, and commit of kernel audit
339 void audit_abort(struct kaudit_record *ar);
340 void audit_commit(struct kaudit_record *ar, int error,
342 struct kaudit_record *audit_new(int event, struct thread *td);
345 * Functions relating to the conversion of internal kernel audit records to
346 * the BSM file format.
349 int kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau);
350 int bsm_rec_verify(void *rec);
353 * Kernel versions of the libbsm audit record functions.
355 void kau_free(struct au_record *rec);
359 * Return values for pre-selection and post-selection decisions.
361 #define AU_PRS_SUCCESS 1
362 #define AU_PRS_FAILURE 2
363 #define AU_PRS_BOTH (AU_PRS_SUCCESS|AU_PRS_FAILURE)
366 * Data structures relating to the kernel audit queue. Ideally, these might
367 * be abstracted so that only accessor methods are exposed.
369 extern struct mtx audit_mtx;
370 extern struct cv audit_watermark_cv;
371 extern struct cv audit_worker_cv;
372 extern struct kaudit_queue audit_q;
373 extern int audit_q_len;
374 extern int audit_pre_q_len;
375 extern int audit_in_failure;
378 * Flags to use on audit files when opening and closing.
380 #define AUDIT_OPEN_FLAGS (FWRITE | O_APPEND)
381 #define AUDIT_CLOSE_FLAGS (FWRITE | O_APPEND)
384 * Audit event-to-name mapping structure, maintained in audit_bsm_klib.c. It
385 * appears in this header so that the DTrace audit provider can dereference
386 * instances passed back in the au_evname_foreach() callbacks. Safe access to
387 * its fields requires holding ene_lock (after it is visible in the global
391 * (c) - Constant after inserted in the global table
392 * (l) - Protected by ene_lock
393 * (m) - Protected by evnamemap_lock (audit_bsm_klib.c)
394 * (M) - Writes protected by evnamemap_lock; reads unprotected.
397 au_event_t ene_event; /* (c) */
398 char ene_name[EVNAMEMAP_NAME_SIZE]; /* (l) */
399 LIST_ENTRY(evname_elem) ene_entry; /* (m) */
402 /* DTrace probe IDs; 0 if not yet registered. */
403 uint32_t ene_commit_probe_id; /* (M) */
404 uint32_t ene_bsm_probe_id; /* (M) */
406 /* Flags indicating if the probes enabled or not. */
407 int ene_commit_probe_enabled; /* (M) */
408 int ene_bsm_probe_enabled; /* (M) */
411 #define EVNAME_LOCK(ene) mtx_lock(&(ene)->ene_lock)
412 #define EVNAME_UNLOCK(ene) mtx_unlock(&(ene)->ene_lock)
415 * Callback function typedef for the same.
417 typedef void (*au_evnamemap_callback_t)(struct evname_elem *ene);
420 * DTrace audit provider (dtaudit) hooks -- to be set non-NULL when the audit
421 * provider is loaded and ready to be called into.
423 extern void *(*dtaudit_hook_preselect)(au_id_t auid, au_event_t event,
425 extern int (*dtaudit_hook_commit)(struct kaudit_record *kar,
426 au_id_t auid, au_event_t event, au_class_t class,
428 extern void (*dtaudit_hook_bsm)(struct kaudit_record *kar, au_id_t auid,
429 au_event_t event, au_class_t class, int sorf,
430 void *bsm_data, size_t bsm_len);
432 #include <sys/fcntl.h>
433 #include <sys/kernel.h>
434 #include <sys/malloc.h>
437 * Some of the BSM tokenizer functions take different parameters in the
438 * kernel implementations in order to save the copying of large kernel data
439 * structures. The prototypes of these functions are declared here.
441 token_t *kau_to_socket(struct socket_au_info *soi);
444 * audit_klib prototypes
446 int au_preselect(au_event_t event, au_class_t class,
447 au_mask_t *mask_p, int sorf);
448 void au_evclassmap_init(void);
449 void au_evclassmap_insert(au_event_t event, au_class_t class);
450 au_class_t au_event_class(au_event_t event);
451 void au_evnamemap_init(void);
452 void au_evnamemap_insert(au_event_t event, const char *name);
453 void au_evnamemap_foreach(au_evnamemap_callback_t callback);
454 struct evname_elem *au_evnamemap_lookup(au_event_t event);
455 int au_event_name(au_event_t event, char *name);
456 au_event_t audit_ctlname_to_sysctlevent(int name[], uint64_t valid_arg);
457 au_event_t audit_flags_and_error_to_openevent(int oflags, int error);
458 au_event_t audit_flags_and_error_to_openatevent(int oflags, int error);
459 au_event_t audit_msgctl_to_event(int cmd);
460 au_event_t audit_msgsys_to_event(int which);
461 au_event_t audit_semctl_to_event(int cmd);
462 au_event_t audit_semsys_to_event(int which);
463 au_event_t audit_shmsys_to_event(int which);
464 void audit_canon_path(struct thread *td, int dirfd, char *path,
466 au_event_t auditon_command_event(int cmd);
469 * Audit trigger events notify user space of kernel audit conditions
472 void audit_trigger_init(void);
473 int audit_send_trigger(unsigned int trigger);
476 * Accessor functions to manage global audit state.
478 void audit_set_kinfo(struct auditinfo_addr *);
479 void audit_get_kinfo(struct auditinfo_addr *);
482 * General audit related functions.
484 struct kaudit_record *currecord(void);
485 void audit_free(struct kaudit_record *ar);
486 void audit_shutdown(void *arg, int howto);
487 void audit_rotate_vnode(struct ucred *cred,
489 void audit_worker_init(void);
492 * Audit pipe functions.
494 int audit_pipe_preselect(au_id_t auid, au_event_t event,
495 au_class_t class, int sorf, int trail_select);
496 void audit_pipe_submit(au_id_t auid, au_event_t event, au_class_t class,
497 int sorf, int trail_select, void *record, u_int record_len);
498 void audit_pipe_submit_user(void *record, u_int record_len);
500 #endif /* ! _SECURITY_AUDIT_PRIVATE_H_ */