1 | /*- |
2 | * Copyright (c) 2008-2009 Apple Inc. |
3 | * All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. Neither the name of Apple Inc. ("Apple") nor the names of |
14 | * its contributors may be used to endorse or promote products derived |
15 | * from this software without specific prior written permission. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR |
21 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
25 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
26 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
27 | * POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
29 | |
30 | #include <stdarg.h> |
31 | |
32 | #include <sys/kernel.h> |
33 | #include <sys/fcntl.h> |
34 | #include <sys/kauth.h> |
35 | #include <sys/conf.h> |
36 | #include <sys/poll.h> |
37 | #include <sys/priv.h> |
38 | #include <sys/queue.h> |
39 | #include <sys/signalvar.h> |
40 | #include <sys/syscall.h> |
41 | #include <sys/sysent.h> |
42 | #include <sys/sysproto.h> |
43 | #include <sys/systm.h> |
44 | #include <sys/ucred.h> |
45 | #include <sys/user.h> |
46 | |
47 | #include <miscfs/devfs/devfs.h> |
48 | |
49 | #include <libkern/OSAtomic.h> |
50 | |
51 | #include <bsm/audit.h> |
52 | #include <bsm/audit_internal.h> |
53 | #include <bsm/audit_kevents.h> |
54 | |
55 | #include <security/audit/audit.h> |
56 | #include <security/audit/audit_bsd.h> |
57 | #include <security/audit/audit_ioctl.h> |
58 | #include <security/audit/audit_private.h> |
59 | |
60 | #include <vm/vm_protos.h> |
61 | #include <mach/mach_port.h> |
62 | #include <kern/audit_sessionport.h> |
63 | |
64 | #include <libkern/OSDebug.h> |
65 | |
66 | /* |
67 | * Audit Session Entry. This is treated as an object with public and private |
68 | * data. The se_auinfo field is the only information that is public and |
69 | * needs to be the first entry. |
70 | */ |
71 | struct au_sentry { |
72 | auditinfo_addr_t se_auinfo; /* Public audit session data. */ |
73 | #define se_asid se_auinfo.ai_asid |
74 | #define se_auid se_auinfo.ai_auid |
75 | #define se_mask se_auinfo.ai_mask |
76 | #define se_termid se_auinfo.ai_termid |
77 | #define se_flags se_auinfo.ai_flags |
78 | |
79 | long se_refcnt; /* Reference count. */ |
80 | long se_procnt; /* Processes in session. */ |
81 | ipc_port_t se_port; /* Session port. */ |
82 | union { |
83 | LIST_ENTRY(au_sentry) se_link; /* Hash bucket link list (1) */ |
84 | struct smr_node se_smr_node; |
85 | }; |
86 | }; |
87 | typedef struct au_sentry au_sentry_t; |
88 | |
89 | #define AU_SENTRY_PTR(aia_p) ((au_sentry_t *)(aia_p)) |
90 | |
91 | /* |
92 | * The default au_sentry/auditinfo_addr entry for ucred. |
93 | */ |
94 | |
95 | static au_sentry_t audit_default_se = { |
96 | .se_auinfo = { |
97 | .ai_auid = AU_DEFAUDITID, |
98 | .ai_asid = AU_DEFAUDITSID, |
99 | .ai_termid = { .at_type = AU_IPv4, }, |
100 | }, |
101 | .se_refcnt = 1, |
102 | .se_procnt = 1, |
103 | }; |
104 | |
105 | struct auditinfo_addr * const audit_default_aia_p = &audit_default_se.se_auinfo; |
106 | |
107 | /* Copied from <ipc/ipc_object.h> */ |
108 | #define IPC_OBJECT_COPYIN_FLAGS_ALLOW_IMMOVABLE_SEND 0x1 |
109 | kern_return_t ipc_object_copyin(ipc_space_t, mach_port_name_t, |
110 | mach_msg_type_name_t, ipc_port_t *, mach_port_context_t, mach_msg_guard_flags_t *, uint32_t); |
111 | void ipc_port_release_send(ipc_port_t); |
112 | |
113 | #if CONFIG_AUDIT |
114 | |
115 | |
116 | /* |
117 | * Currently the hash table is a fixed size. |
118 | */ |
119 | #define HASH_TABLE_SIZE 97 |
120 | #define HASH_ASID(asid) (audit_session_hash(asid) % HASH_TABLE_SIZE) |
121 | |
122 | static struct rwlock se_entry_lck; /* (1) lock for se_link above */ |
123 | |
124 | LIST_HEAD(au_sentry_head, au_sentry); |
125 | static struct au_sentry_head *au_sentry_bucket = NULL; |
126 | |
127 | #define AU_HISTORY_LOGGING 0 |
128 | #if AU_HISTORY_LOGGING |
129 | typedef enum au_history_event { |
130 | AU_HISTORY_EVENT_UNKNOWN = 0, |
131 | AU_HISTORY_EVENT_REF = 1, |
132 | AU_HISTORY_EVENT_UNREF = 2, |
133 | AU_HISTORY_EVENT_BIRTH = 3, |
134 | AU_HISTORY_EVENT_DEATH = 4, |
135 | AU_HISTORY_EVENT_FIND = 5 |
136 | } au_history_event_t; |
137 | |
138 | #define AU_HISTORY_MAX_STACK_DEPTH 8 |
139 | |
140 | struct au_history { |
141 | struct au_sentry *ptr; |
142 | struct au_sentry se; |
143 | void *stack[AU_HISTORY_MAX_STACK_DEPTH]; |
144 | unsigned int stack_depth; |
145 | au_history_event_t event; |
146 | }; |
147 | |
148 | static struct au_history *au_history; |
149 | static size_t au_history_size = 65536; |
150 | static unsigned int au_history_index; |
151 | |
152 | static inline unsigned int |
153 | au_history_entries(void) |
154 | { |
155 | if (au_history_index >= au_history_size) { |
156 | return au_history_size; |
157 | } else { |
158 | return au_history_index; |
159 | } |
160 | } |
161 | |
162 | static inline void |
163 | au_history_record(au_sentry_t *se, au_history_event_t event) |
164 | { |
165 | struct au_history *p; |
166 | unsigned int i; |
167 | |
168 | i = OSAddAtomic(1, &au_history_index); |
169 | p = &au_history[i % au_history_size]; |
170 | |
171 | bzero(p, sizeof(*p)); |
172 | p->event = event; |
173 | bcopy(se, &p->se, sizeof(p->se)); |
174 | p->stack_depth = OSBacktrace(&p->stack[0], AU_HISTORY_MAX_STACK_DEPTH); |
175 | p->ptr = se; |
176 | } |
177 | #else |
178 | #define au_history_record(se, event) do {} while (0) |
179 | #endif |
180 | |
181 | MALLOC_DEFINE(M_AU_SESSION, "audit_session" , "Audit session data" ); |
182 | |
183 | static void audit_ref_session(au_sentry_t *se); |
184 | static void audit_unref_session(au_sentry_t *se); |
185 | |
186 | static void audit_session_event(int event, auditinfo_addr_t *aia_p); |
187 | |
188 | /* |
189 | * Audit session device. |
190 | */ |
191 | |
192 | static MALLOC_DEFINE(M_AUDIT_SDEV, "audit_sdev" , "Audit sdevs" ); |
193 | static MALLOC_DEFINE(M_AUDIT_SDEV_ENTRY, "audit_sdevent" , |
194 | "Audit sdev entries and buffers" ); |
195 | |
196 | /* |
197 | * Default audit sdev buffer parameters. |
198 | */ |
199 | #define AUDIT_SDEV_QLIMIT_DEFAULT 128 |
200 | #define AUDIT_SDEV_QLIMIT_MIN 1 |
201 | #define AUDIT_SDEV_QLIMIT_MAX 1024 |
202 | |
203 | /* |
204 | * Entry structure. |
205 | */ |
206 | struct audit_sdev_entry { |
207 | void *ase_record; |
208 | u_int ase_record_len; |
209 | TAILQ_ENTRY(audit_sdev_entry) ase_queue; |
210 | }; |
211 | |
212 | /* |
213 | * Per audit sdev structure. |
214 | */ |
215 | |
216 | struct audit_sdev { |
217 | int asdev_open; |
218 | |
219 | #define AUDIT_SDEV_ASYNC 0x00000001 |
220 | #define AUDIT_SDEV_NBIO 0x00000002 |
221 | |
222 | #define AUDIT_SDEV_ALLSESSIONS 0x00010000 |
223 | u_int asdev_flags; |
224 | |
225 | struct selinfo asdev_selinfo; |
226 | pid_t asdev_sigio; |
227 | |
228 | au_id_t asdev_auid; |
229 | au_asid_t asdev_asid; |
230 | |
231 | /* Per-sdev mutex for most fields in this struct. */ |
232 | struct mtx asdev_mtx; |
233 | |
234 | /* |
235 | * Per-sdev sleep lock serializing user-generated reads and |
236 | * flushes. uiomove() is called to copy out the current head |
237 | * record's data whie the record remains in the queue, so we |
238 | * prevent other threads from removing it using this lock. |
239 | */ |
240 | struct slck asdev_sx; |
241 | |
242 | /* |
243 | * Condition variable to signal when data has been delivered to |
244 | * a sdev. |
245 | */ |
246 | struct cv asdev_cv; |
247 | |
248 | /* Count and bound of records in the queue. */ |
249 | u_int asdev_qlen; |
250 | u_int asdev_qlimit; |
251 | |
252 | /* The number of bytes of data across all records. */ |
253 | u_int asdev_qbyteslen; |
254 | |
255 | /* |
256 | * The amount read so far of the first record in the queue. |
257 | * (The number of bytes available for reading in the queue is |
258 | * qbyteslen - qoffset.) |
259 | */ |
260 | u_int asdev_qoffset; |
261 | |
262 | /* |
263 | * Per-sdev operation statistics. |
264 | */ |
265 | u_int64_t asdev_inserts; /* Records added. */ |
266 | u_int64_t asdev_reads; /* Records read. */ |
267 | u_int64_t asdev_drops; /* Records dropped. */ |
268 | |
269 | /* |
270 | * Current pending record list. This is protected by a |
271 | * combination of asdev_mtx and asdev_sx. Note that both |
272 | * locks are required to remove a record from the head of the |
273 | * queue, as an in-progress read may sleep while copying and, |
274 | * therefore, cannot hold asdev_mtx. |
275 | */ |
276 | TAILQ_HEAD(, audit_sdev_entry) asdev_queue; |
277 | |
278 | /* Global sdev list. */ |
279 | TAILQ_ENTRY(audit_sdev) asdev_list; |
280 | }; |
281 | |
282 | #define AUDIT_SDEV_LOCK(asdev) mtx_lock(&(asdev)->asdev_mtx) |
283 | #define AUDIT_SDEV_LOCK_ASSERT(asdev) mtx_assert(&(asdev)->asdev_mtx, \ |
284 | MA_OWNED) |
285 | #define AUDIT_SDEV_LOCK_DESTROY(asdev) mtx_destroy(&(asdev)->asdev_mtx) |
286 | #define AUDIT_SDEV_LOCK_INIT(asdev) mtx_init(&(asdev)->asdev_mtx, \ |
287 | "audit_sdev_mtx", NULL, MTX_DEF) |
288 | #define AUDIT_SDEV_UNLOCK(asdev) mtx_unlock(&(asdev)->asdev_mtx) |
289 | #define AUDIT_SDEV_MTX(asdev) (&(asdev)->asdev_mtx) |
290 | |
291 | #define AUDIT_SDEV_SX_LOCK_DESTROY(asd) slck_destroy(&(asd)->asdev_sx) |
292 | #define AUDIT_SDEV_SX_LOCK_INIT(asd) slck_init(&(asd)->asdev_sx, \ |
293 | "audit_sdev_sx") |
294 | #define AUDIT_SDEV_SX_XLOCK_ASSERT(asd) slck_assert(&(asd)->asdev_sx, \ |
295 | SA_XLOCKED) |
296 | #define AUDIT_SDEV_SX_XLOCK_SIG(asd) slck_lock_sig(&(asd)->asdev_sx) |
297 | #define AUDIT_SDEV_SX_XUNLOCK(asd) slck_unlock(&(asd)->asdev_sx) |
298 | |
299 | /* |
300 | * Cloning variables and constants. |
301 | */ |
302 | #define AUDIT_SDEV_NAME "auditsessions" |
303 | #define MAX_AUDIT_SDEVS 32 |
304 | |
305 | static int audit_sdev_major; |
306 | static void *devnode; |
307 | |
308 | /* |
309 | * Global list of audit sdevs. The list is protected by a rw lock. |
310 | * Individaul record queues are protected by per-sdev locks. These |
311 | * locks synchronize between threads walking the list to deliver to |
312 | * individual sdevs and adds/removes of sdevs. |
313 | */ |
314 | static TAILQ_HEAD(, audit_sdev) audit_sdev_list; |
315 | static struct rwlock audit_sdev_lock; |
316 | |
317 | #define AUDIT_SDEV_LIST_LOCK_INIT() rw_init(&audit_sdev_lock, \ |
318 | "audit_sdev_list_lock") |
319 | #define AUDIT_SDEV_LIST_RLOCK() rw_rlock(&audit_sdev_lock) |
320 | #define AUDIT_SDEV_LIST_RUNLOCK() rw_runlock(&audit_sdev_lock) |
321 | #define AUDIT_SDEV_LIST_WLOCK() rw_wlock(&audit_sdev_lock) |
322 | #define AUDIT_SDEV_LIST_WLOCK_ASSERT() rw_assert(&audit_sdev_lock, \ |
323 | RA_WLOCKED) |
324 | #define AUDIT_SDEV_LIST_WUNLOCK() rw_wunlock(&audit_sdev_lock) |
325 | |
326 | /* |
327 | * dev_t doesn't have a pointer for "softc" data so we have to keep track of |
328 | * it with the following global array (indexed by the minor number). |
329 | * |
330 | * XXX We may want to dynamically grow this as need. |
331 | */ |
332 | static struct audit_sdev *audit_sdev_dtab[MAX_AUDIT_SDEVS]; |
333 | |
334 | /* |
335 | * Special device methods and definition. |
336 | */ |
337 | static open_close_fcn_t audit_sdev_open; |
338 | static open_close_fcn_t audit_sdev_close; |
339 | static read_write_fcn_t audit_sdev_read; |
340 | static ioctl_fcn_t audit_sdev_ioctl; |
341 | static select_fcn_t audit_sdev_poll; |
342 | |
343 | static const struct cdevsw audit_sdev_cdevsw = { |
344 | .d_open = audit_sdev_open, |
345 | .d_close = audit_sdev_close, |
346 | .d_read = audit_sdev_read, |
347 | .d_write = eno_rdwrt, |
348 | .d_ioctl = audit_sdev_ioctl, |
349 | .d_stop = eno_stop, |
350 | .d_reset = eno_reset, |
351 | .d_ttys = NULL, |
352 | .d_select = audit_sdev_poll, |
353 | .d_mmap = eno_mmap, |
354 | .d_strategy = eno_strat, |
355 | .d_type = 0 |
356 | }; |
357 | |
358 | /* |
359 | * Global statistics on audit sdevs. |
360 | */ |
361 | static int audit_sdev_count; /* Current number of sdevs. */ |
362 | static u_int64_t audit_sdev_ever; /* Sdevs ever allocated. */ |
363 | static u_int64_t audit_sdev_records; /* Total records seen. */ |
364 | static u_int64_t audit_sdev_drops; /* Global record drop count. */ |
365 | |
366 | static int audit_sdev_init(void); |
367 | |
368 | #define AUDIT_SENTRY_RWLOCK_INIT() rw_init(&se_entry_lck, \ |
369 | "se_entry_lck") |
370 | #define AUDIT_SENTRY_RLOCK() rw_rlock(&se_entry_lck) |
371 | #define AUDIT_SENTRY_WLOCK() rw_wlock(&se_entry_lck) |
372 | #define AUDIT_SENTRY_RWLOCK_ASSERT() rw_assert(&se_entry_lck, RA_LOCKED) |
373 | #define AUDIT_SENTRY_RUNLOCK() rw_runlock(&se_entry_lck) |
374 | #define AUDIT_SENTRY_WUNLOCK() rw_wunlock(&se_entry_lck) |
375 | |
376 | /* |
377 | * Access control on the auditinfo_addr.ai_flags member. |
378 | */ |
379 | static const uint64_t audit_session_superuser_set_sflags_mask = AU_SESSION_FLAG_HAS_GRAPHIC_ACCESS | AU_SESSION_FLAG_HAS_CONSOLE_ACCESS | AU_SESSION_FLAG_HAS_AUTHENTICATED; |
380 | static const uint64_t audit_session_superuser_clear_sflags_mask = AU_SESSION_FLAG_HAS_GRAPHIC_ACCESS | AU_SESSION_FLAG_HAS_CONSOLE_ACCESS | AU_SESSION_FLAG_HAS_AUTHENTICATED; |
381 | static const uint64_t audit_session_member_set_sflags_mask = 0; |
382 | static const uint64_t audit_session_member_clear_sflags_mask = AU_SESSION_FLAG_HAS_AUTHENTICATED; |
383 | |
384 | #define AUDIT_SESSION_DEBUG 0 |
385 | #if AUDIT_SESSION_DEBUG |
386 | /* |
387 | * The following is debugging code that can be used to get a snapshot of the |
388 | * session state. The audit session information is read out using sysctl: |
389 | * |
390 | * error = sysctlbyname("kern.audit_session_debug", buffer_ptr, &buffer_len, |
391 | * NULL, 0); |
392 | */ |
393 | #include <kern/kalloc.h> |
394 | |
395 | /* |
396 | * The per session record structure for the snapshot data. |
397 | */ |
398 | struct au_sentry_debug { |
399 | auditinfo_addr_t se_auinfo; |
400 | int64_t se_refcnt; /* refereence count */ |
401 | int64_t se_procnt; /* process count */ |
402 | int64_t se_ptcnt; /* process count from |
403 | * proc table */ |
404 | }; |
405 | typedef struct au_sentry_debug au_sentry_debug_t; |
406 | |
407 | static int audit_sysctl_session_debug(struct sysctl_oid *oidp, void *arg1, |
408 | int arg2, struct sysctl_req *req); |
409 | |
410 | SYSCTL_PROC(_kern, OID_AUTO, audit_session_debug, CTLFLAG_RD | CTLFLAG_LOCKED, |
411 | NULL, 0, audit_sysctl_session_debug, "S,audit_session_debug" , |
412 | "Current session debug info for auditing." ); |
413 | |
414 | /* |
415 | * Callouts for proc_interate() which is used to reconcile the audit session |
416 | * proc state information with the proc table. We get everything we need |
417 | * in the filterfn while the proc_lock() is held so we really don't need the |
418 | * callout() function. |
419 | */ |
420 | static int |
421 | audit_session_debug_callout(__unused proc_t p, __unused void *arg) |
422 | { |
423 | return PROC_RETURNED_DONE; |
424 | } |
425 | |
426 | static int |
427 | audit_session_debug_filterfn(proc_t p, void *st) |
428 | { |
429 | kauth_cred_t cred = kauth_cred_get(); |
430 | auditinfo_addr_t *aia_p = cred->cr_audit.as_aia_p; |
431 | au_sentry_debug_t *sed_tab = (au_sentry_debug_t *) st; |
432 | au_sentry_debug_t *sdtp; |
433 | au_sentry_t *se; |
434 | |
435 | if (IS_VALID_SESSION(aia_p)) { |
436 | sdtp = &sed_tab[0]; |
437 | do { |
438 | if (aia_p->ai_asid == sdtp->se_asid) { |
439 | sdtp->se_ptcnt++; |
440 | |
441 | /* Do some santy checks. */ |
442 | se = AU_SENTRY_PTR(aia_p); |
443 | if (se->se_refcnt != sdtp->se_refcnt) { |
444 | sdtp->se_refcnt = |
445 | (int64_t)se->se_refcnt; |
446 | } |
447 | if (se->se_procnt != sdtp->se_procnt) { |
448 | sdtp->se_procnt = |
449 | (int64_t)se->se_procnt; |
450 | } |
451 | break; |
452 | } |
453 | sdtp++; |
454 | } while (sdtp->se_asid != 0 && sdtp->se_auid != 0); |
455 | } else { |
456 | /* add it to the default sesison */ |
457 | sed_tab->se_ptcnt++; |
458 | } |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | /* |
464 | * Copy out the session debug info via the sysctl interface. |
465 | * |
466 | */ |
467 | static int |
468 | audit_sysctl_session_debug(__unused struct sysctl_oid *oidp, |
469 | __unused void *arg1, __unused int arg2, struct sysctl_req *req) |
470 | { |
471 | au_sentry_t *se; |
472 | au_sentry_debug_t *sed_tab, *next_sed; |
473 | int i, entry_cnt = 0; |
474 | size_t sz; |
475 | int err = 0; |
476 | |
477 | /* |
478 | * This provides a read-only node. |
479 | */ |
480 | if (req->newptr != USER_ADDR_NULL) { |
481 | return EPERM; |
482 | } |
483 | |
484 | /* |
485 | * Walk the audit session hash table to determine the size. |
486 | */ |
487 | AUDIT_SENTRY_RLOCK(); |
488 | for (i = 0; i < HASH_TABLE_SIZE; i++) { |
489 | LIST_FOREACH(se, &au_sentry_bucket[i], se_link) |
490 | if (se != NULL) { |
491 | entry_cnt++; |
492 | } |
493 | } |
494 | |
495 | entry_cnt++; /* add one for the default entry */ |
496 | /* |
497 | * If just querying then return the space required. There is an |
498 | * obvious race condition here so we just fudge this by 3 in case |
499 | * the audit session table grows. |
500 | */ |
501 | if (req->oldptr == USER_ADDR_NULL) { |
502 | req->oldidx = (entry_cnt + 3) * sizeof(au_sentry_debug_t); |
503 | AUDIT_SENTRY_RUNLOCK(); |
504 | return 0; |
505 | } |
506 | |
507 | /* |
508 | * Alloc a temporary buffer. |
509 | */ |
510 | if (req->oldlen < (entry_cnt * sizeof(au_sentry_debug_t))) { |
511 | AUDIT_SENTRY_RUNLOCK(); |
512 | return ENOMEM; |
513 | } |
514 | /* |
515 | * We hold the lock over the alloc since we don't want the table to |
516 | * grow on us. Therefore, use the non-blocking version of kalloc(). |
517 | */ |
518 | sed_tab = kalloc_data(entry_cnt * sizeof(au_sentry_debug_t), |
519 | Z_NOWAIT | Z_ZERO); |
520 | if (sed_tab == NULL) { |
521 | AUDIT_SENTRY_RUNLOCK(); |
522 | return ENOMEM; |
523 | } |
524 | |
525 | /* |
526 | * Walk the audit session hash table and build the record array. |
527 | */ |
528 | sz = 0; |
529 | next_sed = sed_tab; |
530 | /* add the first entry for processes not tracked in sessions. */ |
531 | bcopy(audit_default_aia_p, &next_sed->se_auinfo, sizeof(au_sentry_t)); |
532 | next_sed->se_refcnt = (int64_t)audit_default_se.se_refcnt; |
533 | next_sed->se_procnt = (int64_t)audit_default_se.se_procnt; |
534 | next_sed++; |
535 | sz += sizeof(au_sentry_debug_t); |
536 | for (i = 0; i < HASH_TABLE_SIZE; i++) { |
537 | LIST_FOREACH(se, &au_sentry_bucket[i], se_link) { |
538 | if (se != NULL) { |
539 | next_sed->se_auinfo = se->se_auinfo; |
540 | next_sed->se_refcnt = (int64_t)se->se_refcnt; |
541 | next_sed->se_procnt = (int64_t)se->se_procnt; |
542 | next_sed++; |
543 | sz += sizeof(au_sentry_debug_t); |
544 | } |
545 | } |
546 | } |
547 | AUDIT_SENTRY_RUNLOCK(); |
548 | |
549 | /* Reconcile with the process table. */ |
550 | proc_iterate(PROC_ALLPROCLIST | PROC_ZOMBPROCLIST, |
551 | audit_session_debug_callout, NULL, |
552 | audit_session_debug_filterfn, (void *)&sed_tab[0]); |
553 | |
554 | |
555 | req->oldlen = sz; |
556 | err = SYSCTL_OUT(req, sed_tab, sz); |
557 | kfree_data(sed_tab, entry_cnt * sizeof(au_sentry_debug_t)); |
558 | |
559 | return err; |
560 | } |
561 | |
562 | #endif /* AUDIT_SESSION_DEBUG */ |
563 | |
564 | /* |
565 | * Create and commit a session audit event. The proc and se arguments needs to |
566 | * be that of the subject and not necessarily the current process. |
567 | */ |
568 | static void |
569 | audit_session_event(int event, auditinfo_addr_t *aia_p) |
570 | { |
571 | struct kaudit_record *ar; |
572 | |
573 | KASSERT(AUE_SESSION_START == event || AUE_SESSION_UPDATE == event || |
574 | AUE_SESSION_END == event || AUE_SESSION_CLOSE == event, |
575 | ("audit_session_event: invalid event: %d" , event)); |
576 | |
577 | if (NULL == aia_p) { |
578 | return; |
579 | } |
580 | |
581 | /* |
582 | * Create a new audit record. The record will contain the subject |
583 | * ruid, rgid, egid, pid, auid, asid, amask, and term_addr |
584 | * (implicitly added by audit_new). |
585 | */ |
586 | ar = audit_new(event, PROC_NULL, /* Not used */ NULL); |
587 | if (NULL == ar) { |
588 | return; |
589 | } |
590 | |
591 | /* |
592 | * Audit session events are always generated because they are used |
593 | * by some userland consumers so just set the preselect flag. |
594 | */ |
595 | ar->k_ar_commit |= AR_PRESELECT_FILTER; |
596 | |
597 | /* |
598 | * Populate the subject information. Note that the ruid, rgid, |
599 | * egid, and pid values are incorrect. We only need the auditinfo_addr |
600 | * information. |
601 | */ |
602 | ar->k_ar.ar_subj_ruid = 0; |
603 | ar->k_ar.ar_subj_rgid = 0; |
604 | ar->k_ar.ar_subj_egid = 0; |
605 | ar->k_ar.ar_subj_pid = 0; |
606 | ar->k_ar.ar_subj_auid = aia_p->ai_auid; |
607 | ar->k_ar.ar_subj_asid = aia_p->ai_asid; |
608 | bcopy(src: &aia_p->ai_termid, dst: &ar->k_ar.ar_subj_term_addr, |
609 | n: sizeof(struct au_tid_addr)); |
610 | |
611 | /* Add the audit masks to the record. */ |
612 | ar->k_ar.ar_arg_amask.am_success = aia_p->ai_mask.am_success; |
613 | ar->k_ar.ar_arg_amask.am_failure = aia_p->ai_mask.am_failure; |
614 | ARG_SET_VALID(ar, ARG_AMASK); |
615 | |
616 | /* Add the audit session flags to the record. */ |
617 | ar->k_ar.ar_arg_value64 = aia_p->ai_flags; |
618 | ARG_SET_VALID(ar, ARG_VALUE64); |
619 | |
620 | |
621 | /* Commit the record to the queue. */ |
622 | audit_commit(ar, error: 0, retval: 0); |
623 | } |
624 | |
625 | /* |
626 | * Hash the audit session ID using a simple 32-bit mix. |
627 | */ |
628 | static inline uint32_t |
629 | audit_session_hash(au_asid_t asid) |
630 | { |
631 | uint32_t a = (uint32_t) asid; |
632 | |
633 | a = (a - (a << 6)) ^ (a >> 17); |
634 | a = (a - (a << 9)) ^ (a << 4); |
635 | a = (a - (a << 3)) ^ (a << 10); |
636 | a = a ^ (a >> 15); |
637 | |
638 | return a; |
639 | } |
640 | |
641 | /* |
642 | * Do an hash lookup and find the session entry for a given ASID. Return NULL |
643 | * if not found. If the session is found then audit_session_find takes a |
644 | * reference. |
645 | */ |
646 | static au_sentry_t * |
647 | audit_session_find(au_asid_t asid) |
648 | { |
649 | uint32_t hkey; |
650 | au_sentry_t *found_se; |
651 | |
652 | AUDIT_SENTRY_RWLOCK_ASSERT(); |
653 | |
654 | hkey = HASH_ASID(asid); |
655 | |
656 | LIST_FOREACH(found_se, &au_sentry_bucket[hkey], se_link) |
657 | if (found_se->se_asid == asid) { |
658 | au_history_record(found_se, AU_HISTORY_EVENT_FIND); |
659 | audit_ref_session(se: found_se); |
660 | return found_se; |
661 | } |
662 | return NULL; |
663 | } |
664 | |
665 | static void |
666 | audit_session_free(smr_node_t node) |
667 | { |
668 | au_sentry_t *se = __container_of(node, au_sentry_t, se_smr_node); |
669 | |
670 | kfree_type(au_sentry_t, se); |
671 | } |
672 | |
673 | /* |
674 | * Remove the given audit_session entry from the hash table. |
675 | */ |
676 | static void |
677 | audit_session_remove(au_sentry_t *se) |
678 | { |
679 | uint32_t hkey; |
680 | au_sentry_t *found_se, *tmp_se; |
681 | |
682 | au_history_record(se, AU_HISTORY_EVENT_DEATH); |
683 | KASSERT(se->se_refcnt == 0, ("audit_session_remove: ref count != 0" )); |
684 | KASSERT(se != &audit_default_se, |
685 | ("audit_session_remove: removing default session" )); |
686 | |
687 | hkey = HASH_ASID(se->se_asid); |
688 | |
689 | AUDIT_SENTRY_WLOCK(); |
690 | /* |
691 | * Check and see if someone got a reference before we got the lock. |
692 | */ |
693 | if (se->se_refcnt != 0) { |
694 | AUDIT_SENTRY_WUNLOCK(); |
695 | return; |
696 | } |
697 | |
698 | audit_session_portdestroy(&se->se_port); |
699 | LIST_FOREACH_SAFE(found_se, &au_sentry_bucket[hkey], se_link, tmp_se) { |
700 | if (found_se == se) { |
701 | /* |
702 | * Generate an audit event to notify userland of the |
703 | * session close. |
704 | */ |
705 | audit_session_event(AUE_SESSION_CLOSE, |
706 | aia_p: &found_se->se_auinfo); |
707 | |
708 | LIST_REMOVE(found_se, se_link); |
709 | AUDIT_SENTRY_WUNLOCK(); |
710 | smr_call(smr: &smr_proc_task, node: &found_se->se_smr_node, |
711 | size: sizeof(found_se), cb: audit_session_free); |
712 | return; |
713 | } |
714 | } |
715 | AUDIT_SENTRY_WUNLOCK(); |
716 | } |
717 | |
718 | /* |
719 | * Reference the session by incrementing the sentry ref count. |
720 | */ |
721 | static void |
722 | audit_ref_session(au_sentry_t *se) |
723 | { |
724 | long old_val; |
725 | |
726 | if (se == NULL || se == &audit_default_se) { |
727 | return; |
728 | } |
729 | |
730 | au_history_record(se, AU_HISTORY_EVENT_REF); |
731 | |
732 | old_val = OSAddAtomicLong(1, &se->se_refcnt); |
733 | KASSERT(old_val < 100000, |
734 | ("audit_ref_session: Too many references on session." )); |
735 | } |
736 | |
737 | /* |
738 | * Decrement the sentry ref count and remove the session entry if last one. |
739 | */ |
740 | static void |
741 | audit_unref_session(au_sentry_t *se) |
742 | { |
743 | long old_val; |
744 | |
745 | if (se == NULL || se == &audit_default_se) { |
746 | return; |
747 | } |
748 | |
749 | au_history_record(se, AU_HISTORY_EVENT_UNREF); |
750 | |
751 | old_val = OSAddAtomicLong(-1, &se->se_refcnt); |
752 | if (old_val == 1) { |
753 | audit_session_remove(se); |
754 | } |
755 | KASSERT(old_val > 0, |
756 | ("audit_unref_session: Too few references on session." )); |
757 | } |
758 | |
759 | /* |
760 | * Increment the process count in the session. |
761 | */ |
762 | static void |
763 | audit_inc_procount(au_sentry_t *se) |
764 | { |
765 | long old_val; |
766 | |
767 | if (se == NULL || se == &audit_default_se) { |
768 | return; |
769 | } |
770 | |
771 | old_val = OSAddAtomicLong(1, &se->se_procnt); |
772 | KASSERT(old_val <= PID_MAX, |
773 | ("audit_inc_procount: proc count > PID_MAX" )); |
774 | } |
775 | |
776 | /* |
777 | * Decrement the process count and add a knote if it is the last process |
778 | * to exit the session. |
779 | */ |
780 | static void |
781 | audit_dec_procount(au_sentry_t *se) |
782 | { |
783 | long old_val; |
784 | |
785 | if (se == NULL || se == &audit_default_se) { |
786 | return; |
787 | } |
788 | |
789 | old_val = OSAddAtomicLong(-1, &se->se_procnt); |
790 | /* |
791 | * If this was the last process generate an audit event to notify |
792 | * userland of the session ending. |
793 | */ |
794 | if (old_val == 1) { |
795 | audit_session_event(AUE_SESSION_END, aia_p: &se->se_auinfo); |
796 | } |
797 | KASSERT(old_val >= 1, |
798 | ("audit_dec_procount: proc count < 0" )); |
799 | } |
800 | |
801 | /* |
802 | * Update the session entry and check to see if anything was updated. |
803 | * Returns: |
804 | * 0 Nothing was updated (We don't care about process preselection masks) |
805 | * 1 Something was updated. |
806 | */ |
807 | static int |
808 | audit_update_sentry(au_sentry_t *se, auditinfo_addr_t *new_aia) |
809 | { |
810 | auditinfo_addr_t *aia = &se->se_auinfo; |
811 | int update; |
812 | |
813 | KASSERT(new_aia != audit_default_aia_p, |
814 | ("audit_update_sentry: Trying to update the default aia." )); |
815 | |
816 | update = (aia->ai_auid != new_aia->ai_auid || |
817 | bcmp(s1: &aia->ai_termid, s2: &new_aia->ai_termid, |
818 | n: sizeof(new_aia->ai_termid)) || |
819 | aia->ai_flags != new_aia->ai_flags); |
820 | |
821 | if (update) { |
822 | bcopy(src: new_aia, dst: aia, n: sizeof(*aia)); |
823 | } |
824 | |
825 | return update; |
826 | } |
827 | |
828 | /* |
829 | * Return the next session ID. The range of kernel generated audit session IDs |
830 | * is ASSIGNED_ASID_MIN to ASSIGNED_ASID_MAX. |
831 | */ |
832 | static uint32_t |
833 | audit_session_nextid(void) |
834 | { |
835 | static uint32_t next_asid = ASSIGNED_ASID_MIN; |
836 | |
837 | AUDIT_SENTRY_RWLOCK_ASSERT(); |
838 | |
839 | if (next_asid > ASSIGNED_ASID_MAX) { |
840 | next_asid = ASSIGNED_ASID_MIN; |
841 | } |
842 | |
843 | return next_asid++; |
844 | } |
845 | |
846 | /* |
847 | * Allocated a new audit_session entry and add it to the hash table. If the |
848 | * given ASID is set to AU_ASSIGN_ASID then audit_session_new() will pick an |
849 | * audit session ID. Otherwise, it attempts use the one given. It creates a |
850 | * reference to the entry that must be unref'ed. |
851 | */ |
852 | static auditinfo_addr_t * |
853 | audit_session_new(auditinfo_addr_t *new_aia_p, auditinfo_addr_t *old_aia_p) |
854 | { |
855 | au_asid_t new_asid; |
856 | au_sentry_t *se = NULL; |
857 | au_sentry_t *found_se = NULL; |
858 | auditinfo_addr_t *aia = NULL; |
859 | |
860 | KASSERT(new_aia_p != NULL, ("audit_session_new: new_aia_p == NULL" )); |
861 | |
862 | new_asid = new_aia_p->ai_asid; |
863 | |
864 | /* |
865 | * Alloc a new session entry now so we don't wait holding the lock. |
866 | */ |
867 | se = kalloc_type(au_sentry_t, Z_WAITOK | Z_ZERO | Z_NOFAIL); |
868 | |
869 | /* |
870 | * Find an unique session ID, if desired. |
871 | */ |
872 | AUDIT_SENTRY_WLOCK(); |
873 | if (new_asid == AU_ASSIGN_ASID) { |
874 | do { |
875 | new_asid = (au_asid_t)audit_session_nextid(); |
876 | found_se = audit_session_find(asid: new_asid); |
877 | |
878 | /* |
879 | * If the session ID is currently active then drop the |
880 | * reference and try again. |
881 | */ |
882 | if (found_se != NULL) { |
883 | audit_unref_session(se: found_se); |
884 | } else { |
885 | break; |
886 | } |
887 | } while (1); |
888 | } else { |
889 | /* |
890 | * Check to see if the requested ASID is already in the |
891 | * hash table. If so, update it with the new auditinfo. |
892 | */ |
893 | if ((found_se = audit_session_find(asid: new_asid)) != NULL) { |
894 | int updated; |
895 | |
896 | updated = audit_update_sentry(se: found_se, new_aia: new_aia_p); |
897 | |
898 | AUDIT_SENTRY_WUNLOCK(); |
899 | kfree_type(au_sentry_t, se); |
900 | |
901 | /* If a different session then add this process in. */ |
902 | if (new_aia_p != old_aia_p) { |
903 | audit_inc_procount(se: found_se); |
904 | } |
905 | |
906 | /* |
907 | * If the session information was updated then |
908 | * generate an audit event to notify userland. |
909 | */ |
910 | if (updated) { |
911 | audit_session_event(AUE_SESSION_UPDATE, |
912 | aia_p: &found_se->se_auinfo); |
913 | } |
914 | |
915 | return &found_se->se_auinfo; |
916 | } |
917 | } |
918 | |
919 | /* |
920 | * Start the reference and proc count at 1 to account for the process |
921 | * that invoked this via setaudit_addr() (or friends). |
922 | */ |
923 | se->se_refcnt = se->se_procnt = 1; |
924 | |
925 | /* |
926 | * Populate the new session entry. Note that process masks are stored |
927 | * in kauth ucred so just zero them here. |
928 | */ |
929 | se->se_port = IPC_PORT_NULL; |
930 | aia = &se->se_auinfo; |
931 | aia->ai_asid = new_asid; |
932 | aia->ai_auid = new_aia_p->ai_auid; |
933 | bzero(s: &new_aia_p->ai_mask, n: sizeof(new_aia_p->ai_mask)); |
934 | bcopy(src: &new_aia_p->ai_termid, dst: &aia->ai_termid, n: sizeof(aia->ai_termid)); |
935 | aia->ai_flags = new_aia_p->ai_flags; |
936 | |
937 | /* |
938 | * Add it to the hash table. |
939 | */ |
940 | LIST_INSERT_HEAD(&au_sentry_bucket[HASH_ASID(new_asid)], se, se_link); |
941 | AUDIT_SENTRY_WUNLOCK(); |
942 | |
943 | /* |
944 | * Generate an audit event to notify userland of the new session. |
945 | */ |
946 | audit_session_event(AUE_SESSION_START, aia_p: aia); |
947 | au_history_record(se, AU_HISTORY_EVENT_BIRTH); |
948 | return aia; |
949 | } |
950 | |
951 | /* |
952 | * Lookup an existing session. A copy of the audit session info for a given |
953 | * ASID is returned in ret_aia. Returns 0 on success. |
954 | */ |
955 | int |
956 | audit_session_lookup(au_asid_t asid, auditinfo_addr_t *ret_aia) |
957 | { |
958 | au_sentry_t *se = NULL; |
959 | |
960 | if ((uint32_t)asid > ASSIGNED_ASID_MAX) { |
961 | return -1; |
962 | } |
963 | AUDIT_SENTRY_RLOCK(); |
964 | if ((se = audit_session_find(asid)) == NULL) { |
965 | AUDIT_SENTRY_RUNLOCK(); |
966 | return 1; |
967 | } |
968 | /* We have a reference on the session so it is safe to drop the lock. */ |
969 | AUDIT_SENTRY_RUNLOCK(); |
970 | if (ret_aia != NULL) { |
971 | bcopy(src: &se->se_auinfo, dst: ret_aia, n: sizeof(*ret_aia)); |
972 | } |
973 | audit_unref_session(se); |
974 | |
975 | return 0; |
976 | } |
977 | |
978 | void |
979 | audit_session_aiaref(auditinfo_addr_t *aia_p) |
980 | { |
981 | audit_ref_session(AU_SENTRY_PTR(aia_p)); |
982 | } |
983 | |
984 | /* |
985 | * Add a reference to the session entry. |
986 | */ |
987 | void |
988 | audit_session_ref(kauth_cred_t cred) |
989 | { |
990 | auditinfo_addr_t *aia_p; |
991 | |
992 | KASSERT(IS_VALID_CRED(cred), |
993 | ("audit_session_ref: Invalid kauth_cred." )); |
994 | |
995 | aia_p = cred->cr_audit.as_aia_p; |
996 | audit_session_aiaref(aia_p); |
997 | } |
998 | |
999 | void |
1000 | audit_session_aiaunref(auditinfo_addr_t *aia_p) |
1001 | { |
1002 | audit_unref_session(AU_SENTRY_PTR(aia_p)); |
1003 | } |
1004 | |
1005 | /* |
1006 | * Remove a reference to the session entry. |
1007 | */ |
1008 | void |
1009 | audit_session_unref(kauth_cred_t cred) |
1010 | { |
1011 | auditinfo_addr_t *aia_p; |
1012 | |
1013 | KASSERT(IS_VALID_CRED(cred), |
1014 | ("audit_session_unref: Invalid kauth_cred." )); |
1015 | |
1016 | aia_p = cred->cr_audit.as_aia_p; |
1017 | audit_session_aiaunref(aia_p); |
1018 | } |
1019 | |
1020 | /* |
1021 | * Increment the per audit session process count. Assumes that the caller has |
1022 | * a reference on the process' cred. |
1023 | */ |
1024 | void |
1025 | audit_session_procnew(proc_t p) |
1026 | { |
1027 | kauth_cred_t cred = proc_ucred_unsafe(p); /* during create */ |
1028 | auditinfo_addr_t *aia_p; |
1029 | |
1030 | KASSERT(IS_VALID_CRED(cred), |
1031 | ("audit_session_procnew: Invalid kauth_cred." )); |
1032 | |
1033 | aia_p = cred->cr_audit.as_aia_p; |
1034 | |
1035 | audit_inc_procount(AU_SENTRY_PTR(aia_p)); |
1036 | } |
1037 | |
1038 | /* |
1039 | * Decrement the per audit session process count. Assumes that the caller has |
1040 | * a reference on the cred. |
1041 | */ |
1042 | void |
1043 | audit_session_procexit(proc_t p) |
1044 | { |
1045 | kauth_cred_t cred = proc_ucred_unsafe(p); /* during exit */ |
1046 | auditinfo_addr_t *aia_p; |
1047 | |
1048 | KASSERT(IS_VALID_CRED(cred), |
1049 | ("audit_session_procexit: Invalid kauth_cred." )); |
1050 | |
1051 | aia_p = cred->cr_audit.as_aia_p; |
1052 | |
1053 | audit_dec_procount(AU_SENTRY_PTR(aia_p)); |
1054 | } |
1055 | |
1056 | /* |
1057 | * Init the audit session code. |
1058 | */ |
1059 | void |
1060 | audit_session_init(void) |
1061 | { |
1062 | int i; |
1063 | |
1064 | KASSERT((ASSIGNED_ASID_MAX - ASSIGNED_ASID_MIN) > PID_MAX, |
1065 | ("audit_session_init: ASSIGNED_ASID_MAX is not large enough." )); |
1066 | |
1067 | AUDIT_SENTRY_RWLOCK_INIT(); |
1068 | |
1069 | au_sentry_bucket = zalloc_permanent(sizeof(struct au_sentry) * |
1070 | HASH_TABLE_SIZE, ZALIGN_PTR); |
1071 | |
1072 | for (i = 0; i < HASH_TABLE_SIZE; i++) { |
1073 | LIST_INIT(&au_sentry_bucket[i]); |
1074 | } |
1075 | |
1076 | (void)audit_sdev_init(); |
1077 | #if AU_HISTORY_LOGGING |
1078 | au_history = zalloc_permanent(sizeof(struct au_history) * au_history_size, |
1079 | ZALIGN_PTR); |
1080 | #endif |
1081 | } |
1082 | |
1083 | static int |
1084 | audit_session_update_check(kauth_cred_t cred, auditinfo_addr_t *old, |
1085 | auditinfo_addr_t *new) |
1086 | { |
1087 | uint64_t n; |
1088 | |
1089 | /* If the current audit ID is not the default then it is immutable. */ |
1090 | if (old->ai_auid != AU_DEFAUDITID && old->ai_auid != new->ai_auid) { |
1091 | return EINVAL; |
1092 | } |
1093 | |
1094 | /* If the current termid is not the default then it is immutable. */ |
1095 | if ((old->ai_termid.at_type != AU_IPv4 || |
1096 | old->ai_termid.at_port != 0 || |
1097 | old->ai_termid.at_addr[0] != 0) && |
1098 | (old->ai_termid.at_port != new->ai_termid.at_port || |
1099 | old->ai_termid.at_type != new->ai_termid.at_type || |
1100 | 0 != bcmp(s1: &old->ai_termid.at_addr, s2: &new->ai_termid.at_addr, |
1101 | n: sizeof(old->ai_termid.at_addr)))) { |
1102 | return EINVAL; |
1103 | } |
1104 | |
1105 | /* The flags may be set only according to the |
1106 | * audit_session_*_set_sflags_masks. |
1107 | */ |
1108 | n = ~old->ai_flags & new->ai_flags; |
1109 | if (0 != n && |
1110 | !((n == (audit_session_superuser_set_sflags_mask & n) && |
1111 | kauth_cred_issuser(cred: cred)) || |
1112 | (n == (audit_session_member_set_sflags_mask & n) && |
1113 | old->ai_asid == new->ai_asid))) { |
1114 | return EINVAL; |
1115 | } |
1116 | |
1117 | /* The flags may be cleared only according to the |
1118 | * audit_session_*_clear_sflags_masks. |
1119 | */ |
1120 | n = ~new->ai_flags & old->ai_flags; |
1121 | if (0 != n && |
1122 | !((n == (audit_session_superuser_clear_sflags_mask & n) && |
1123 | kauth_cred_issuser(cred: cred)) || |
1124 | (n == (audit_session_member_clear_sflags_mask & n) && |
1125 | old->ai_asid == new->ai_asid))) { |
1126 | return EINVAL; |
1127 | } |
1128 | |
1129 | /* The audit masks are mutable. */ |
1130 | return 0; |
1131 | } |
1132 | |
1133 | /* |
1134 | * Protect updates to proc->cred->session |
1135 | * |
1136 | * The lifecycle of sessions and kauth creds do not compose well, |
1137 | * so this lock makes sure that even in the presence of concurrent |
1138 | * updates to the proc's credential, sessions stay stable. |
1139 | * |
1140 | * This lock is only used to serialize audit_session_setaia() |
1141 | * and audit_session_join_internal() with each other, |
1142 | * which are called from posix_spawn() or regular syscall context. |
1143 | * |
1144 | * Once the session is established in the cred, this lock |
1145 | * is no longer required, it is only about avoiding racing |
1146 | * updates and lifetime bugs due to the discrepancy between |
1147 | * audit sessions and creds. |
1148 | */ |
1149 | static void |
1150 | proc_audit_session_lock(proc_t p) |
1151 | { |
1152 | lck_mtx_lock(lck: &p->p_audit_mlock); |
1153 | } |
1154 | |
1155 | static void |
1156 | proc_audit_session_unlock(proc_t p) |
1157 | { |
1158 | lck_mtx_unlock(lck: &p->p_audit_mlock); |
1159 | } |
1160 | |
1161 | /* |
1162 | * Safely update kauth cred of the given process with new the given audit info. |
1163 | */ |
1164 | int |
1165 | audit_session_setaia(proc_t p, auditinfo_addr_t *new_aia_p) |
1166 | { |
1167 | kauth_cred_t my_cred; |
1168 | struct au_session as, *asp = &as; |
1169 | auditinfo_addr_t caia, *old_aia_p; |
1170 | int ret; |
1171 | |
1172 | proc_audit_session_lock(p); |
1173 | my_cred = kauth_cred_proc_ref(procp: p); |
1174 | |
1175 | /* |
1176 | * If this is going to modify an existing session then do some |
1177 | * immutable checks. |
1178 | */ |
1179 | if (audit_session_lookup(asid: new_aia_p->ai_asid, ret_aia: &caia) == 0) { |
1180 | ret = audit_session_update_check(cred: my_cred, old: &caia, new: new_aia_p); |
1181 | if (ret) { |
1182 | proc_audit_session_unlock(p); |
1183 | kauth_cred_unref(&my_cred); |
1184 | return ret; |
1185 | } |
1186 | } |
1187 | |
1188 | bcopy(src: &new_aia_p->ai_mask, dst: &as.as_mask, n: sizeof(as.as_mask)); |
1189 | old_aia_p = my_cred->cr_audit.as_aia_p; |
1190 | /* audit_session_new() adds a reference on the session */ |
1191 | as.as_aia_p = audit_session_new(new_aia_p, old_aia_p); |
1192 | |
1193 | kauth_cred_proc_update(p, action: PROC_SETTOKEN_LAZY, |
1194 | fn: ^bool (kauth_cred_t parent __unused, kauth_cred_t model) { |
1195 | return kauth_cred_model_setauditinfo(model, asp); |
1196 | }); |
1197 | |
1198 | proc_audit_session_unlock(p); |
1199 | kauth_cred_unref(&my_cred); |
1200 | |
1201 | /* If the process left a session then update the process count. */ |
1202 | if (old_aia_p != new_aia_p) { |
1203 | audit_dec_procount(AU_SENTRY_PTR(old_aia_p)); |
1204 | } |
1205 | |
1206 | /* Drop the reference taken by audit_session_new() above. */ |
1207 | audit_unref_session(AU_SENTRY_PTR(as.as_aia_p)); |
1208 | |
1209 | return 0; |
1210 | } |
1211 | |
1212 | /* |
1213 | * audit_session_self (system call) |
1214 | * |
1215 | * Description: Obtain a Mach send right for the current session. |
1216 | * |
1217 | * Parameters: p Process calling audit_session_self(). |
1218 | * |
1219 | * Returns: *ret_port Named Mach send right, which may be |
1220 | * MACH_PORT_NULL in the failure case. |
1221 | * |
1222 | * Errno: 0 Success |
1223 | * EINVAL The calling process' session has not be set. |
1224 | * ESRCH Bad process, can't get valid cred for process. |
1225 | * ENOMEM Port allocation failed due to no free memory. |
1226 | */ |
1227 | int |
1228 | audit_session_self(proc_t p, __unused struct audit_session_self_args *uap, |
1229 | mach_port_name_t *ret_port) |
1230 | { |
1231 | ipc_port_t sendport = IPC_PORT_NULL; |
1232 | kauth_cred_t cred = NULL; |
1233 | auditinfo_addr_t *aia_p; |
1234 | au_sentry_t *se; |
1235 | int err = 0; |
1236 | |
1237 | cred = kauth_cred_proc_ref(procp: p); |
1238 | if (!IS_VALID_CRED(cred)) { |
1239 | err = ESRCH; |
1240 | goto done; |
1241 | } |
1242 | |
1243 | aia_p = cred->cr_audit.as_aia_p; |
1244 | if (!IS_VALID_SESSION(aia_p)) { |
1245 | /* Can't join the default session. */ |
1246 | err = EINVAL; |
1247 | goto done; |
1248 | } |
1249 | |
1250 | se = AU_SENTRY_PTR(aia_p); |
1251 | |
1252 | /* |
1253 | * Processes that join using this mach port will inherit this process' |
1254 | * pre-selection masks. |
1255 | */ |
1256 | if (se->se_port == IPC_PORT_NULL) { |
1257 | bcopy(src: &cred->cr_audit.as_mask, dst: &se->se_mask, |
1258 | n: sizeof(se->se_mask)); |
1259 | } |
1260 | |
1261 | /* |
1262 | * Get a send right to the session's Mach port and insert it in the |
1263 | * process' mach port namespace. |
1264 | */ |
1265 | sendport = audit_session_mksend(aia_p, &se->se_port); |
1266 | *ret_port = ipc_port_copyout_send(sright: sendport, space: get_task_ipcspace(t: proc_task(p))); |
1267 | |
1268 | done: |
1269 | if (cred != NULL) { |
1270 | kauth_cred_unref(&cred); |
1271 | } |
1272 | if (err != 0) { |
1273 | *ret_port = MACH_PORT_NULL; |
1274 | } |
1275 | return err; |
1276 | } |
1277 | |
1278 | /* |
1279 | * audit_session_port (system call) |
1280 | * |
1281 | * Description: Obtain a Mach send right for the given session ID. |
1282 | * |
1283 | * Parameters: p Process calling audit_session_port(). |
1284 | * uap->asid The target audit session ID. The special |
1285 | * value -1 can be used to target the process's |
1286 | * own session. |
1287 | * uap->portnamep User address at which to place port name. |
1288 | * |
1289 | * Returns: 0 Success |
1290 | * EINVAL The calling process' session has not be set. |
1291 | * EINVAL The given session ID could not be found. |
1292 | * EINVAL The Mach port right could not be copied out. |
1293 | * ESRCH Bad process, can't get valid cred for process. |
1294 | * EPERM Only the superuser can reference sessions other |
1295 | * than the process's own. |
1296 | * ENOMEM Port allocation failed due to no free memory. |
1297 | */ |
1298 | int |
1299 | audit_session_port(proc_t p, struct audit_session_port_args *uap, |
1300 | __unused int *retval) |
1301 | { |
1302 | ipc_port_t sendport = IPC_PORT_NULL; |
1303 | mach_port_name_t portname = MACH_PORT_NULL; |
1304 | kauth_cred_t cred = NULL; |
1305 | auditinfo_addr_t *aia_p = NULL; |
1306 | au_sentry_t *se = NULL; |
1307 | int err = 0; |
1308 | |
1309 | /* Note: Currently this test will never be true, because |
1310 | * ASSIGNED_ASID_MAX is effectively (uint32_t)-2. |
1311 | */ |
1312 | if (uap->asid != -1 && (uint32_t)uap->asid > ASSIGNED_ASID_MAX) { |
1313 | err = EINVAL; |
1314 | goto done; |
1315 | } |
1316 | cred = kauth_cred_proc_ref(procp: p); |
1317 | if (!IS_VALID_CRED(cred)) { |
1318 | err = ESRCH; |
1319 | goto done; |
1320 | } |
1321 | aia_p = cred->cr_audit.as_aia_p; |
1322 | |
1323 | /* Find the session corresponding to the requested audit |
1324 | * session ID. If found, take a reference on it so that |
1325 | * the session is not dropped until the join is later done. |
1326 | */ |
1327 | if (uap->asid == (au_asid_t)-1 || |
1328 | uap->asid == aia_p->ai_asid) { |
1329 | if (!IS_VALID_SESSION(aia_p)) { |
1330 | /* Can't join the default session. */ |
1331 | err = EINVAL; |
1332 | goto done; |
1333 | } |
1334 | |
1335 | /* No privilege is required to obtain a port for our |
1336 | * own session. |
1337 | */ |
1338 | se = AU_SENTRY_PTR(aia_p); |
1339 | audit_ref_session(se); |
1340 | } else { |
1341 | /* |
1342 | * Only privileged processes may obtain a port for |
1343 | * any existing session. |
1344 | */ |
1345 | err = priv_check_cred(cred, PRIV_AUDIT_SESSION_PORT, flags: 0); |
1346 | if (err != 0) { |
1347 | goto done; |
1348 | } |
1349 | AUDIT_SENTRY_RLOCK(); |
1350 | se = audit_session_find(asid: uap->asid); |
1351 | AUDIT_SENTRY_RUNLOCK(); |
1352 | if (NULL == se) { |
1353 | err = EINVAL; |
1354 | goto done; |
1355 | } |
1356 | aia_p = &se->se_auinfo; |
1357 | } |
1358 | |
1359 | /* |
1360 | * Processes that join using this mach port will inherit this process' |
1361 | * pre-selection masks. |
1362 | */ |
1363 | if (se->se_port == IPC_PORT_NULL) { |
1364 | bcopy(src: &cred->cr_audit.as_mask, dst: &se->se_mask, |
1365 | n: sizeof(se->se_mask)); |
1366 | } |
1367 | |
1368 | /* |
1369 | * Use the session reference to create a mach port reference for the |
1370 | * session (at which point we are free to drop the session reference) |
1371 | * and then copy out the mach port to the process' mach port namespace. |
1372 | */ |
1373 | sendport = audit_session_mksend(aia_p, &se->se_port); |
1374 | portname = ipc_port_copyout_send(sright: sendport, space: get_task_ipcspace(t: proc_task(p))); |
1375 | if (!MACH_PORT_VALID(portname)) { |
1376 | err = EINVAL; |
1377 | goto done; |
1378 | } |
1379 | err = copyout(&portname, uap->portnamep, sizeof(mach_port_name_t)); |
1380 | done: |
1381 | if (cred != NULL) { |
1382 | kauth_cred_unref(&cred); |
1383 | } |
1384 | if (NULL != se) { |
1385 | audit_unref_session(se); |
1386 | } |
1387 | if (MACH_PORT_VALID(portname) && 0 != err) { |
1388 | (void)mach_port_deallocate(task: get_task_ipcspace(t: proc_task(p)), |
1389 | name: portname); |
1390 | } |
1391 | |
1392 | return err; |
1393 | } |
1394 | |
1395 | static int |
1396 | audit_session_join_internal(proc_t p, ipc_port_t port, au_asid_t *new_asid) |
1397 | { |
1398 | __block auditinfo_addr_t *old_aia_p = NULL; |
1399 | auditinfo_addr_t *new_aia_p; |
1400 | int err = 0; |
1401 | |
1402 | if ((new_aia_p = audit_session_porttoaia(port)) == NULL) { |
1403 | err = EINVAL; |
1404 | *new_asid = AU_DEFAUDITSID; |
1405 | goto done; |
1406 | } |
1407 | |
1408 | /* Increment the proc count of new session */ |
1409 | audit_inc_procount(AU_SENTRY_PTR(new_aia_p)); |
1410 | |
1411 | proc_audit_session_lock(p); |
1412 | |
1413 | kauth_cred_proc_update(p, action: PROC_SETTOKEN_LAZY, |
1414 | fn: ^bool (kauth_cred_t parent __unused, kauth_cred_t model) { |
1415 | struct au_session new_as; |
1416 | |
1417 | old_aia_p = model->cr_audit.as_aia_p; |
1418 | |
1419 | if (old_aia_p->ai_asid == new_aia_p->ai_asid) { |
1420 | return false; |
1421 | } |
1422 | |
1423 | bcopy(src: &new_aia_p->ai_mask, dst: &new_as.as_mask, |
1424 | n: sizeof(new_as.as_mask)); |
1425 | new_as.as_aia_p = new_aia_p; |
1426 | |
1427 | return kauth_cred_model_setauditinfo(model, &new_as); |
1428 | }); |
1429 | |
1430 | proc_audit_session_unlock(p); |
1431 | |
1432 | /* Decrement the process count of the former session. */ |
1433 | audit_dec_procount(AU_SENTRY_PTR(old_aia_p)); |
1434 | |
1435 | *new_asid = new_aia_p->ai_asid; |
1436 | |
1437 | done: |
1438 | if (port != IPC_PORT_NULL) { |
1439 | ipc_port_release_send(port); |
1440 | } |
1441 | |
1442 | return err; |
1443 | } |
1444 | |
1445 | /* |
1446 | * audit_session_spawnjoin |
1447 | * |
1448 | * Description: posix_spawn() interface to audit_session_join_internal(). |
1449 | * |
1450 | * Returns: 0 Success |
1451 | * EINVAL Invalid Mach port name. |
1452 | * ESRCH Invalid calling process/cred. |
1453 | */ |
1454 | int |
1455 | audit_session_spawnjoin(proc_t p, ipc_port_t port) |
1456 | { |
1457 | au_asid_t new_asid; |
1458 | |
1459 | return audit_session_join_internal(p, port, new_asid: &new_asid); |
1460 | } |
1461 | |
1462 | /* |
1463 | * audit_session_join (system call) |
1464 | * |
1465 | * Description: Join the session for a given Mach port send right. |
1466 | * |
1467 | * Parameters: p Process calling session join. |
1468 | * uap->port A Mach send right. |
1469 | * |
1470 | * Returns: *ret_asid Audit session ID of new session. |
1471 | * In the failure case the return value will be -1 |
1472 | * and 'errno' will be set to a non-zero value |
1473 | * described below. |
1474 | * |
1475 | * Errno: 0 Success |
1476 | * EINVAL Invalid Mach port name. |
1477 | * ESRCH Invalid calling process/cred. |
1478 | */ |
1479 | int |
1480 | audit_session_join(proc_t p, struct audit_session_join_args *uap, |
1481 | au_asid_t *ret_asid) |
1482 | { |
1483 | ipc_port_t port = IPC_PORT_NULL; |
1484 | mach_port_name_t send = uap->port; |
1485 | int err = 0; |
1486 | |
1487 | |
1488 | if (ipc_object_copyin(get_task_ipcspace(t: proc_task(p)), send, |
1489 | MACH_MSG_TYPE_COPY_SEND, &port, 0, NULL, |
1490 | IPC_OBJECT_COPYIN_FLAGS_ALLOW_IMMOVABLE_SEND) != KERN_SUCCESS) { |
1491 | *ret_asid = AU_DEFAUDITSID; |
1492 | err = EINVAL; |
1493 | } else { |
1494 | err = audit_session_join_internal(p, port, new_asid: ret_asid); |
1495 | } |
1496 | |
1497 | return err; |
1498 | } |
1499 | |
1500 | /* |
1501 | * Audit session device. |
1502 | */ |
1503 | |
1504 | /* |
1505 | * Free an audit sdev entry. |
1506 | */ |
1507 | static void |
1508 | audit_sdev_entry_free(struct audit_sdev_entry *ase) |
1509 | { |
1510 | kfree_data(ase->ase_record, ase->ase_record_len); |
1511 | kfree_type(struct audit_sdev_entry, ase); |
1512 | } |
1513 | |
1514 | /* |
1515 | * Append individual record to a queue. Allocate queue-local buffer and |
1516 | * add to the queue. If the queue is full or we can't allocate memory, |
1517 | * drop the newest record. |
1518 | */ |
1519 | static void |
1520 | audit_sdev_append(struct audit_sdev *asdev, void *record, u_int record_len) |
1521 | { |
1522 | struct audit_sdev_entry *ase; |
1523 | |
1524 | AUDIT_SDEV_LOCK_ASSERT(asdev); |
1525 | |
1526 | if (asdev->asdev_qlen >= asdev->asdev_qlimit) { |
1527 | asdev->asdev_drops++; |
1528 | audit_sdev_drops++; |
1529 | return; |
1530 | } |
1531 | |
1532 | ase = kalloc_type(struct audit_sdev_entry, Z_NOWAIT | Z_ZERO); |
1533 | if (NULL == ase) { |
1534 | asdev->asdev_drops++; |
1535 | audit_sdev_drops++; |
1536 | return; |
1537 | } |
1538 | |
1539 | ase->ase_record = kalloc_data(record_len, Z_NOWAIT); |
1540 | if (NULL == ase->ase_record) { |
1541 | kfree_type(struct audit_sdev_entry, ase); |
1542 | asdev->asdev_drops++; |
1543 | audit_sdev_drops++; |
1544 | return; |
1545 | } |
1546 | |
1547 | bcopy(src: record, dst: ase->ase_record, n: record_len); |
1548 | ase->ase_record_len = record_len; |
1549 | |
1550 | TAILQ_INSERT_TAIL(&asdev->asdev_queue, ase, ase_queue); |
1551 | asdev->asdev_inserts++; |
1552 | asdev->asdev_qlen++; |
1553 | asdev->asdev_qbyteslen += ase->ase_record_len; |
1554 | selwakeup(&asdev->asdev_selinfo); |
1555 | if (asdev->asdev_flags & AUDIT_SDEV_ASYNC) { |
1556 | pgsigio(pgid: asdev->asdev_sigio, SIGIO); |
1557 | } |
1558 | |
1559 | cv_broadcast(&asdev->asdev_cv); |
1560 | } |
1561 | |
1562 | /* |
1563 | * Submit an audit record to be queued in the audit session device. |
1564 | */ |
1565 | void |
1566 | audit_sdev_submit(__unused au_id_t auid, __unused au_asid_t asid, void *record, |
1567 | u_int record_len) |
1568 | { |
1569 | struct audit_sdev *asdev; |
1570 | |
1571 | /* |
1572 | * Lockless read to avoid lock overhead if sessio devices are not in |
1573 | * use. |
1574 | */ |
1575 | if (NULL == TAILQ_FIRST(&audit_sdev_list)) { |
1576 | return; |
1577 | } |
1578 | |
1579 | AUDIT_SDEV_LIST_RLOCK(); |
1580 | TAILQ_FOREACH(asdev, &audit_sdev_list, asdev_list) { |
1581 | AUDIT_SDEV_LOCK(asdev); |
1582 | |
1583 | /* |
1584 | * Only append to the sdev queue if the AUID and ASID match that |
1585 | * of the process that opened this session device or if the |
1586 | * ALLSESSIONS flag is set. |
1587 | */ |
1588 | if ((/* XXXss auid == asdev->asdev_auid && */ |
1589 | asid == asdev->asdev_asid) || |
1590 | (asdev->asdev_flags & AUDIT_SDEV_ALLSESSIONS) != 0) { |
1591 | audit_sdev_append(asdev, record, record_len); |
1592 | } |
1593 | AUDIT_SDEV_UNLOCK(asdev); |
1594 | } |
1595 | AUDIT_SDEV_LIST_RUNLOCK(); |
1596 | |
1597 | /* Unlocked increment. */ |
1598 | audit_sdev_records++; |
1599 | } |
1600 | |
1601 | /* |
1602 | * Allocate a new audit sdev. Connects the sdev, on succes, to the global |
1603 | * list and updates statistics. |
1604 | */ |
1605 | static struct audit_sdev * |
1606 | audit_sdev_alloc(void) |
1607 | { |
1608 | struct audit_sdev *asdev; |
1609 | |
1610 | AUDIT_SDEV_LIST_WLOCK_ASSERT(); |
1611 | |
1612 | asdev = kalloc_type(struct audit_sdev, Z_ZERO | Z_WAITOK | Z_NOFAIL); |
1613 | asdev->asdev_qlimit = AUDIT_SDEV_QLIMIT_DEFAULT; |
1614 | TAILQ_INIT(&asdev->asdev_queue); |
1615 | AUDIT_SDEV_LOCK_INIT(asdev); |
1616 | AUDIT_SDEV_SX_LOCK_INIT(asdev); |
1617 | cv_init(&asdev->asdev_cv, "audit_sdev_cv" ); |
1618 | |
1619 | /* |
1620 | * Add to global list and update global statistics. |
1621 | */ |
1622 | TAILQ_INSERT_HEAD(&audit_sdev_list, asdev, asdev_list); |
1623 | audit_sdev_count++; |
1624 | audit_sdev_ever++; |
1625 | |
1626 | return asdev; |
1627 | } |
1628 | |
1629 | /* |
1630 | * Flush all records currently present in an audit sdev. |
1631 | */ |
1632 | static void |
1633 | audit_sdev_flush(struct audit_sdev *asdev) |
1634 | { |
1635 | struct audit_sdev_entry *ase; |
1636 | |
1637 | AUDIT_SDEV_LOCK_ASSERT(asdev); |
1638 | |
1639 | while ((ase = TAILQ_FIRST(&asdev->asdev_queue)) != NULL) { |
1640 | TAILQ_REMOVE(&asdev->asdev_queue, ase, ase_queue); |
1641 | asdev->asdev_qbyteslen -= ase->ase_record_len; |
1642 | audit_sdev_entry_free(ase); |
1643 | asdev->asdev_qlen--; |
1644 | } |
1645 | asdev->asdev_qoffset = 0; |
1646 | |
1647 | KASSERT(0 == asdev->asdev_qlen, ("audit_sdev_flush: asdev_qlen" )); |
1648 | KASSERT(0 == asdev->asdev_qbyteslen, |
1649 | ("audit_sdev_flush: asdev_qbyteslen" )); |
1650 | } |
1651 | |
1652 | /* |
1653 | * Free an audit sdev. |
1654 | */ |
1655 | static void |
1656 | audit_sdev_free(struct audit_sdev *asdev) |
1657 | { |
1658 | AUDIT_SDEV_LIST_WLOCK_ASSERT(); |
1659 | AUDIT_SDEV_LOCK_ASSERT(asdev); |
1660 | |
1661 | /* XXXss - preselect hook here */ |
1662 | audit_sdev_flush(asdev); |
1663 | cv_destroy(&asdev->asdev_cv); |
1664 | AUDIT_SDEV_SX_LOCK_DESTROY(asdev); |
1665 | AUDIT_SDEV_UNLOCK(asdev); |
1666 | AUDIT_SDEV_LOCK_DESTROY(asdev); |
1667 | |
1668 | TAILQ_REMOVE(&audit_sdev_list, asdev, asdev_list); |
1669 | kfree_type(struct audit_sdev, asdev); |
1670 | audit_sdev_count--; |
1671 | } |
1672 | |
1673 | /* |
1674 | * Get the auditinfo_addr of the proc and check to see if suser. Will return |
1675 | * non-zero if not suser. |
1676 | */ |
1677 | static int |
1678 | audit_sdev_get_aia(proc_t p, struct auditinfo_addr *aia_p) |
1679 | { |
1680 | int error; |
1681 | kauth_cred_t scred; |
1682 | |
1683 | scred = kauth_cred_proc_ref(procp: p); |
1684 | error = suser(cred: scred, acflag: &p->p_acflag); |
1685 | |
1686 | if (NULL != aia_p) { |
1687 | bcopy(src: scred->cr_audit.as_aia_p, dst: aia_p, n: sizeof(*aia_p)); |
1688 | } |
1689 | kauth_cred_unref(&scred); |
1690 | |
1691 | return error; |
1692 | } |
1693 | |
1694 | /* |
1695 | * Audit session dev open method. |
1696 | */ |
1697 | static int |
1698 | audit_sdev_open(dev_t dev, __unused int flags, __unused int devtype, proc_t p) |
1699 | { |
1700 | struct audit_sdev *asdev; |
1701 | struct auditinfo_addr aia; |
1702 | int u; |
1703 | |
1704 | u = minor(dev); |
1705 | if (u < 0 || u >= MAX_AUDIT_SDEVS) { |
1706 | return ENXIO; |
1707 | } |
1708 | |
1709 | (void) audit_sdev_get_aia(p, aia_p: &aia); |
1710 | |
1711 | AUDIT_SDEV_LIST_WLOCK(); |
1712 | asdev = audit_sdev_dtab[u]; |
1713 | if (NULL == asdev) { |
1714 | asdev = audit_sdev_alloc(); |
1715 | if (NULL == asdev) { |
1716 | AUDIT_SDEV_LIST_WUNLOCK(); |
1717 | return ENOMEM; |
1718 | } |
1719 | audit_sdev_dtab[u] = asdev; |
1720 | } else { |
1721 | KASSERT(asdev->asdev_open, ("audit_sdev_open: Already open" )); |
1722 | AUDIT_SDEV_LIST_WUNLOCK(); |
1723 | return EBUSY; |
1724 | } |
1725 | asdev->asdev_open = 1; |
1726 | asdev->asdev_auid = aia.ai_auid; |
1727 | asdev->asdev_asid = aia.ai_asid; |
1728 | asdev->asdev_flags = 0; |
1729 | |
1730 | AUDIT_SDEV_LIST_WUNLOCK(); |
1731 | |
1732 | return 0; |
1733 | } |
1734 | |
1735 | /* |
1736 | * Audit session dev close method. |
1737 | */ |
1738 | static int |
1739 | audit_sdev_close(dev_t dev, __unused int flags, __unused int devtype, |
1740 | __unused proc_t p) |
1741 | { |
1742 | struct audit_sdev *asdev; |
1743 | int u; |
1744 | |
1745 | u = minor(dev); |
1746 | asdev = audit_sdev_dtab[u]; |
1747 | |
1748 | KASSERT(asdev != NULL, ("audit_sdev_close: asdev == NULL" )); |
1749 | KASSERT(asdev->asdev_open, ("audit_sdev_close: !asdev_open" )); |
1750 | |
1751 | AUDIT_SDEV_LIST_WLOCK(); |
1752 | AUDIT_SDEV_LOCK(asdev); |
1753 | asdev->asdev_open = 0; |
1754 | audit_sdev_free(asdev); /* sdev lock unlocked in audit_sdev_free() */ |
1755 | audit_sdev_dtab[u] = NULL; |
1756 | AUDIT_SDEV_LIST_WUNLOCK(); |
1757 | |
1758 | return 0; |
1759 | } |
1760 | |
1761 | /* |
1762 | * Audit session dev ioctl method. |
1763 | */ |
1764 | static int |
1765 | audit_sdev_ioctl(dev_t dev, u_long cmd, caddr_t data, |
1766 | __unused int flag, proc_t p) |
1767 | { |
1768 | struct audit_sdev *asdev; |
1769 | int error; |
1770 | |
1771 | asdev = audit_sdev_dtab[minor(dev)]; |
1772 | KASSERT(asdev != NULL, ("audit_sdev_ioctl: asdev == NULL" )); |
1773 | |
1774 | error = 0; |
1775 | |
1776 | switch (cmd) { |
1777 | case FIONBIO: |
1778 | AUDIT_SDEV_LOCK(asdev); |
1779 | if (*(int *)data) { |
1780 | asdev->asdev_flags |= AUDIT_SDEV_NBIO; |
1781 | } else { |
1782 | asdev->asdev_flags &= ~AUDIT_SDEV_NBIO; |
1783 | } |
1784 | AUDIT_SDEV_UNLOCK(asdev); |
1785 | break; |
1786 | |
1787 | case FIONREAD: |
1788 | AUDIT_SDEV_LOCK(asdev); |
1789 | *(int *)data = asdev->asdev_qbyteslen - asdev->asdev_qoffset; |
1790 | AUDIT_SDEV_UNLOCK(asdev); |
1791 | break; |
1792 | |
1793 | case AUDITSDEV_GET_QLEN: |
1794 | *(u_int *)data = asdev->asdev_qlen; |
1795 | break; |
1796 | |
1797 | case AUDITSDEV_GET_QLIMIT: |
1798 | *(u_int *)data = asdev->asdev_qlimit; |
1799 | break; |
1800 | |
1801 | case AUDITSDEV_SET_QLIMIT: |
1802 | if (*(u_int *)data >= AUDIT_SDEV_QLIMIT_MIN || |
1803 | *(u_int *)data <= AUDIT_SDEV_QLIMIT_MAX) { |
1804 | asdev->asdev_qlimit = *(u_int *)data; |
1805 | } else { |
1806 | error = EINVAL; |
1807 | } |
1808 | break; |
1809 | |
1810 | case AUDITSDEV_GET_QLIMIT_MIN: |
1811 | *(u_int *)data = AUDIT_SDEV_QLIMIT_MIN; |
1812 | break; |
1813 | |
1814 | case AUDITSDEV_GET_QLIMIT_MAX: |
1815 | *(u_int *)data = AUDIT_SDEV_QLIMIT_MAX; |
1816 | break; |
1817 | |
1818 | case AUDITSDEV_FLUSH: |
1819 | if (AUDIT_SDEV_SX_XLOCK_SIG(asdev) != 0) { |
1820 | return EINTR; |
1821 | } |
1822 | AUDIT_SDEV_LOCK(asdev); |
1823 | audit_sdev_flush(asdev); |
1824 | AUDIT_SDEV_UNLOCK(asdev); |
1825 | AUDIT_SDEV_SX_XUNLOCK(asdev); |
1826 | break; |
1827 | |
1828 | case AUDITSDEV_GET_MAXDATA: |
1829 | *(u_int *)data = MAXAUDITDATA; |
1830 | break; |
1831 | |
1832 | /* XXXss these should be 64 bit, maybe. */ |
1833 | case AUDITSDEV_GET_INSERTS: |
1834 | *(u_int *)data = asdev->asdev_inserts; |
1835 | break; |
1836 | |
1837 | case AUDITSDEV_GET_READS: |
1838 | *(u_int *)data = asdev->asdev_reads; |
1839 | break; |
1840 | |
1841 | case AUDITSDEV_GET_DROPS: |
1842 | *(u_int *)data = asdev->asdev_drops; |
1843 | break; |
1844 | |
1845 | case AUDITSDEV_GET_ALLSESSIONS: |
1846 | error = audit_sdev_get_aia(p, NULL); |
1847 | if (error) { |
1848 | break; |
1849 | } |
1850 | *(u_int *)data = (asdev->asdev_flags & AUDIT_SDEV_ALLSESSIONS) ? |
1851 | 1 : 0; |
1852 | break; |
1853 | |
1854 | case AUDITSDEV_SET_ALLSESSIONS: |
1855 | error = audit_sdev_get_aia(p, NULL); |
1856 | if (error) { |
1857 | break; |
1858 | } |
1859 | |
1860 | AUDIT_SDEV_LOCK(asdev); |
1861 | if (*(int *)data) { |
1862 | asdev->asdev_flags |= AUDIT_SDEV_ALLSESSIONS; |
1863 | } else { |
1864 | asdev->asdev_flags &= ~AUDIT_SDEV_ALLSESSIONS; |
1865 | } |
1866 | AUDIT_SDEV_UNLOCK(asdev); |
1867 | break; |
1868 | |
1869 | default: |
1870 | error = ENOTTY; |
1871 | } |
1872 | |
1873 | return error; |
1874 | } |
1875 | |
1876 | /* |
1877 | * Audit session dev read method. |
1878 | */ |
1879 | static int |
1880 | audit_sdev_read(dev_t dev, struct uio *uio, __unused int flag) |
1881 | { |
1882 | struct audit_sdev_entry *ase; |
1883 | struct audit_sdev *asdev; |
1884 | u_int toread; |
1885 | int error; |
1886 | |
1887 | asdev = audit_sdev_dtab[minor(dev)]; |
1888 | KASSERT(NULL != asdev, ("audit_sdev_read: asdev == NULL" )); |
1889 | |
1890 | /* |
1891 | * We hold a sleep lock over read and flush because we rely on the |
1892 | * stability of a record in the queue during uiomove. |
1893 | */ |
1894 | if (0 != AUDIT_SDEV_SX_XLOCK_SIG(asdev)) { |
1895 | return EINTR; |
1896 | } |
1897 | AUDIT_SDEV_LOCK(asdev); |
1898 | while (TAILQ_EMPTY(&asdev->asdev_queue)) { |
1899 | if (asdev->asdev_flags & AUDIT_SDEV_NBIO) { |
1900 | AUDIT_SDEV_UNLOCK(asdev); |
1901 | AUDIT_SDEV_SX_XUNLOCK(asdev); |
1902 | return EAGAIN; |
1903 | } |
1904 | error = cv_wait_sig(&asdev->asdev_cv, AUDIT_SDEV_MTX(asdev)); |
1905 | if (error) { |
1906 | AUDIT_SDEV_UNLOCK(asdev); |
1907 | AUDIT_SDEV_SX_XUNLOCK(asdev); |
1908 | return error; |
1909 | } |
1910 | } |
1911 | |
1912 | /* |
1913 | * Copy as many remaining bytes from the current record to userspace |
1914 | * as we can. Keep processing records until we run out of records in |
1915 | * the queue or until the user buffer runs out of space. |
1916 | * |
1917 | * We rely on the sleep lock to maintain ase's stability here. |
1918 | */ |
1919 | asdev->asdev_reads++; |
1920 | while ((ase = TAILQ_FIRST(&asdev->asdev_queue)) != NULL && |
1921 | uio_resid(a_uio: uio) > 0) { |
1922 | AUDIT_SDEV_LOCK_ASSERT(asdev); |
1923 | |
1924 | KASSERT(ase->ase_record_len > asdev->asdev_qoffset, |
1925 | ("audit_sdev_read: record_len > qoffset (1)" )); |
1926 | toread = MIN((int)(ase->ase_record_len - asdev->asdev_qoffset), |
1927 | uio_resid(uio)); |
1928 | AUDIT_SDEV_UNLOCK(asdev); |
1929 | error = uiomove(cp: (char *) ase->ase_record + asdev->asdev_qoffset, |
1930 | n: toread, uio); |
1931 | if (error) { |
1932 | AUDIT_SDEV_SX_XUNLOCK(asdev); |
1933 | return error; |
1934 | } |
1935 | |
1936 | /* |
1937 | * If the copy succeeded then update book-keeping, and if no |
1938 | * bytes remain in the current record then free it. |
1939 | */ |
1940 | AUDIT_SDEV_LOCK(asdev); |
1941 | KASSERT(TAILQ_FIRST(&asdev->asdev_queue) == ase, |
1942 | ("audit_sdev_read: queue out of sync after uiomove" )); |
1943 | asdev->asdev_qoffset += toread; |
1944 | KASSERT(ase->ase_record_len >= asdev->asdev_qoffset, |
1945 | ("audit_sdev_read: record_len >= qoffset (2)" )); |
1946 | if (asdev->asdev_qoffset == ase->ase_record_len) { |
1947 | TAILQ_REMOVE(&asdev->asdev_queue, ase, ase_queue); |
1948 | asdev->asdev_qbyteslen -= ase->ase_record_len; |
1949 | audit_sdev_entry_free(ase); |
1950 | asdev->asdev_qlen--; |
1951 | asdev->asdev_qoffset = 0; |
1952 | } |
1953 | } |
1954 | AUDIT_SDEV_UNLOCK(asdev); |
1955 | AUDIT_SDEV_SX_XUNLOCK(asdev); |
1956 | return 0; |
1957 | } |
1958 | |
1959 | /* |
1960 | * Audit session device poll method. |
1961 | */ |
1962 | static int |
1963 | audit_sdev_poll(dev_t dev, int events, void *wql, struct proc *p) |
1964 | { |
1965 | struct audit_sdev *asdev; |
1966 | int revents; |
1967 | |
1968 | revents = 0; |
1969 | asdev = audit_sdev_dtab[minor(dev)]; |
1970 | KASSERT(NULL != asdev, ("audit_sdev_poll: asdev == NULL" )); |
1971 | |
1972 | if (events & (POLLIN | POLLRDNORM)) { |
1973 | AUDIT_SDEV_LOCK(asdev); |
1974 | if (NULL != TAILQ_FIRST(&asdev->asdev_queue)) { |
1975 | revents |= events & (POLLIN | POLLRDNORM); |
1976 | } else { |
1977 | selrecord(selector: p, &asdev->asdev_selinfo, wql); |
1978 | } |
1979 | AUDIT_SDEV_UNLOCK(asdev); |
1980 | } |
1981 | return revents; |
1982 | } |
1983 | |
1984 | /* |
1985 | * Audit sdev clone routine. Provides a new minor number or returns -1. |
1986 | * This called with DEVFS_LOCK held. |
1987 | */ |
1988 | static int |
1989 | audit_sdev_clone(__unused dev_t dev, int action) |
1990 | { |
1991 | int i; |
1992 | |
1993 | if (DEVFS_CLONE_ALLOC == action) { |
1994 | for (i = 0; i < MAX_AUDIT_SDEVS; i++) { |
1995 | if (NULL == audit_sdev_dtab[i]) { |
1996 | return i; |
1997 | } |
1998 | } |
1999 | |
2000 | /* |
2001 | * This really should return -1 here but that seems to |
2002 | * hang things in devfs. We instead return 0 and let |
2003 | * audit_sdev_open tell userland the bad news. |
2004 | */ |
2005 | return 0; |
2006 | } |
2007 | |
2008 | return -1; |
2009 | } |
2010 | |
2011 | static int |
2012 | audit_sdev_init(void) |
2013 | { |
2014 | dev_t dev; |
2015 | |
2016 | TAILQ_INIT(&audit_sdev_list); |
2017 | AUDIT_SDEV_LIST_LOCK_INIT(); |
2018 | |
2019 | audit_sdev_major = cdevsw_add(-1, &audit_sdev_cdevsw); |
2020 | if (audit_sdev_major < 0) { |
2021 | return KERN_FAILURE; |
2022 | } |
2023 | |
2024 | dev = makedev(audit_sdev_major, 0); |
2025 | devnode = devfs_make_node_clone(dev, DEVFS_CHAR, UID_ROOT, GID_WHEEL, |
2026 | perms: 0644, clone: audit_sdev_clone, AUDIT_SDEV_NAME); |
2027 | |
2028 | if (NULL == devnode) { |
2029 | return KERN_FAILURE; |
2030 | } |
2031 | |
2032 | return KERN_SUCCESS; |
2033 | } |
2034 | |
2035 | /* XXXss |
2036 | * static int |
2037 | * audit_sdev_shutdown(void) |
2038 | * { |
2039 | * |
2040 | * devfs_remove(devnode); |
2041 | * (void) cdevsw_remove(audit_sdev_major, &audit_sdev_cdevsw); |
2042 | * |
2043 | * return (KERN_SUCCESS); |
2044 | * } |
2045 | */ |
2046 | |
2047 | #else |
2048 | |
2049 | int |
2050 | audit_session_self(proc_t p, struct audit_session_self_args *uap, |
2051 | mach_port_name_t *ret_port) |
2052 | { |
2053 | #pragma unused(p, uap, ret_port) |
2054 | |
2055 | return ENOSYS; |
2056 | } |
2057 | |
2058 | int |
2059 | audit_session_join(proc_t p, struct audit_session_join_args *uap, |
2060 | au_asid_t *ret_asid) |
2061 | { |
2062 | #pragma unused(p, uap, ret_asid) |
2063 | |
2064 | return ENOSYS; |
2065 | } |
2066 | |
2067 | int |
2068 | audit_session_port(proc_t p, struct audit_session_port_args *uap, int *retval) |
2069 | { |
2070 | #pragma unused(p, uap, retval) |
2071 | |
2072 | return ENOSYS; |
2073 | } |
2074 | |
2075 | #endif /* CONFIG_AUDIT */ |
2076 | |