audit.c revision 156889
1155192Srwatson/* 2155192Srwatson * Copyright (c) 1999-2005 Apple Computer, Inc. 3155406Srwatson * Copyright (c) 2006 Robert N. M. Watson 4155192Srwatson * All rights reserved. 5155192Srwatson * 6155192Srwatson * Redistribution and use in source and binary forms, with or without 7155192Srwatson * modification, are permitted provided that the following conditions 8155192Srwatson * are met: 9155192Srwatson * 1. Redistributions of source code must retain the above copyright 10155192Srwatson * notice, this list of conditions and the following disclaimer. 11155192Srwatson * 2. Redistributions in binary form must reproduce the above copyright 12155192Srwatson * notice, this list of conditions and the following disclaimer in the 13155192Srwatson * documentation and/or other materials provided with the distribution. 14155192Srwatson * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15155192Srwatson * its contributors may be used to endorse or promote products derived 16155192Srwatson * from this software without specific prior written permission. 17155192Srwatson * 18155192Srwatson * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND 19155192Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20155192Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21155192Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR 22155192Srwatson * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23155192Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24155192Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25155192Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26155192Srwatson * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27155192Srwatson * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28155192Srwatson * POSSIBILITY OF SUCH DAMAGE. 29155192Srwatson * 30155192Srwatson * $FreeBSD: head/sys/security/audit/audit.c 156889 2006-03-19 17:34:00Z rwatson $ 31155192Srwatson */ 32155192Srwatson 33155192Srwatson#include <sys/param.h> 34155192Srwatson#include <sys/condvar.h> 35155192Srwatson#include <sys/conf.h> 36155192Srwatson#include <sys/file.h> 37155192Srwatson#include <sys/filedesc.h> 38155192Srwatson#include <sys/fcntl.h> 39155192Srwatson#include <sys/ipc.h> 40155192Srwatson#include <sys/kernel.h> 41155192Srwatson#include <sys/kthread.h> 42155192Srwatson#include <sys/malloc.h> 43155192Srwatson#include <sys/mount.h> 44155192Srwatson#include <sys/namei.h> 45155192Srwatson#include <sys/proc.h> 46155192Srwatson#include <sys/queue.h> 47155192Srwatson#include <sys/socket.h> 48155192Srwatson#include <sys/socketvar.h> 49155192Srwatson#include <sys/protosw.h> 50155192Srwatson#include <sys/domain.h> 51155192Srwatson#include <sys/sysproto.h> 52155192Srwatson#include <sys/sysent.h> 53155192Srwatson#include <sys/systm.h> 54155192Srwatson#include <sys/ucred.h> 55155192Srwatson#include <sys/uio.h> 56155192Srwatson#include <sys/un.h> 57155192Srwatson#include <sys/unistd.h> 58155192Srwatson#include <sys/vnode.h> 59155192Srwatson 60155406Srwatson#include <bsm/audit.h> 61156291Srwatson#include <bsm/audit_internal.h> 62155406Srwatson#include <bsm/audit_kevents.h> 63155406Srwatson 64155192Srwatson#include <netinet/in.h> 65155192Srwatson#include <netinet/in_pcb.h> 66155192Srwatson 67155192Srwatson#include <security/audit/audit.h> 68155192Srwatson#include <security/audit/audit_private.h> 69155192Srwatson 70155406Srwatson#include <vm/uma.h> 71155406Srwatson 72156888Srwatsonstatic uma_zone_t audit_record_zone; 73155192Srwatsonstatic MALLOC_DEFINE(M_AUDITPROC, "audit_proc", "Audit process storage"); 74155192SrwatsonMALLOC_DEFINE(M_AUDITDATA, "audit_data", "Audit data storage"); 75155192SrwatsonMALLOC_DEFINE(M_AUDITPATH, "audit_path", "Audit path storage"); 76155192SrwatsonMALLOC_DEFINE(M_AUDITTEXT, "audit_text", "Audit text storage"); 77155192Srwatson 78155192Srwatson/* 79156889Srwatson * Audit control settings that are set/read by system calls and are 80155192Srwatson * hence non-static. 81155192Srwatson */ 82156889Srwatson/* 83155192Srwatson * Define the audit control flags. 84155192Srwatson */ 85156889Srwatsonint audit_enabled; 86156889Srwatsonint audit_suspended; 87155192Srwatson 88155192Srwatson/* 89155192Srwatson * Flags controlling behavior in low storage situations. 90155192Srwatson * Should we panic if a write fails? Should we fail stop 91155192Srwatson * if we're out of disk space? 92155192Srwatson */ 93156889Srwatsonint audit_panic_on_write_fail; 94156889Srwatsonint audit_fail_stop; 95155192Srwatson 96155192Srwatson/* 97155192Srwatson * Are we currently "failing stop" due to out of disk space? 98155192Srwatson */ 99156889Srwatsonint audit_in_failure; 100155192Srwatson 101155192Srwatson/* 102156889Srwatson * Global audit statistiscs. 103155192Srwatson */ 104156889Srwatsonstruct audit_fstat audit_fstat; 105155192Srwatson 106155192Srwatson/* 107155192Srwatson * Preselection mask for non-attributable events. 108155192Srwatson */ 109156889Srwatsonstruct au_mask audit_nae_mask; 110155192Srwatson 111155192Srwatson/* 112155192Srwatson * Mutex to protect global variables shared between various threads and 113155192Srwatson * processes. 114155192Srwatson */ 115156889Srwatsonstruct mtx audit_mtx; 116155192Srwatson 117155192Srwatson/* 118155192Srwatson * Queue of audit records ready for delivery to disk. We insert new 119155192Srwatson * records at the tail, and remove records from the head. Also, 120155192Srwatson * a count of the number of records used for checking queue depth. 121155192Srwatson * In addition, a counter of records that we have allocated but are 122155192Srwatson * not yet in the queue, which is needed to estimate the total 123155192Srwatson * size of the combined set of records outstanding in the system. 124155192Srwatson */ 125156889Srwatsonstruct kaudit_queue audit_q; 126156889Srwatsonint audit_q_len; 127156889Srwatsonint audit_pre_q_len; 128155192Srwatson 129155192Srwatson/* 130155192Srwatson * Audit queue control settings (minimum free, low/high water marks, etc.) 131155192Srwatson */ 132156889Srwatsonstruct au_qctrl audit_qctrl; 133155192Srwatson 134155192Srwatson/* 135155192Srwatson * Condition variable to signal to the worker that it has work to do: 136155192Srwatson * either new records are in the queue, or a log replacement is taking 137155192Srwatson * place. 138155192Srwatson */ 139156889Srwatsonstruct cv audit_cv; 140155192Srwatson 141155192Srwatson/* 142155192Srwatson * Condition variable to signal to the worker that it has work to do: 143155192Srwatson * either new records are in the queue, or a log replacement is taking 144155192Srwatson * place. 145156888Srwatson * 146156888Srwatson * XXXRW: This description is incorrect. 147155192Srwatson */ 148156889Srwatsonstruct cv audit_commit_cv; 149155192Srwatson 150156889Srwatson/* 151156889Srwatson * Condition variable for auditing threads wait on when in fail-stop mode. 152156889Srwatson * Threads wait on this CV forever (and ever), never seeing the light of 153155192Srwatson * day again. 154155192Srwatson */ 155156889Srwatsonstatic struct cv audit_fail_cv; 156155192Srwatson 157155192Srwatson/* 158155406Srwatson * Construct an audit record for the passed thread. 159155192Srwatson */ 160155406Srwatsonstatic int 161155406Srwatsonaudit_record_ctor(void *mem, int size, void *arg, int flags) 162155406Srwatson{ 163155406Srwatson struct kaudit_record *ar; 164155406Srwatson struct thread *td; 165155406Srwatson 166155406Srwatson KASSERT(sizeof(*ar) == size, ("audit_record_ctor: wrong size")); 167155406Srwatson 168155406Srwatson td = arg; 169155406Srwatson ar = mem; 170155406Srwatson bzero(ar, sizeof(*ar)); 171155406Srwatson ar->k_ar.ar_magic = AUDIT_RECORD_MAGIC; 172155406Srwatson nanotime(&ar->k_ar.ar_starttime); 173155406Srwatson 174155406Srwatson /* 175155406Srwatson * Export the subject credential. 176155406Srwatson * 177155406Srwatson * XXXAUDIT: td_ucred access is OK without proc lock, but some other 178155406Srwatson * fields here may require the proc lock. 179155406Srwatson */ 180155406Srwatson cru2x(td->td_ucred, &ar->k_ar.ar_subj_cred); 181155406Srwatson ar->k_ar.ar_subj_ruid = td->td_ucred->cr_ruid; 182155406Srwatson ar->k_ar.ar_subj_rgid = td->td_ucred->cr_rgid; 183155406Srwatson ar->k_ar.ar_subj_egid = td->td_ucred->cr_groups[0]; 184155406Srwatson ar->k_ar.ar_subj_auid = td->td_proc->p_au->ai_auid; 185155406Srwatson ar->k_ar.ar_subj_asid = td->td_proc->p_au->ai_asid; 186155406Srwatson ar->k_ar.ar_subj_pid = td->td_proc->p_pid; 187155406Srwatson ar->k_ar.ar_subj_amask = td->td_proc->p_au->ai_mask; 188155406Srwatson ar->k_ar.ar_subj_term = td->td_proc->p_au->ai_termid; 189155406Srwatson bcopy(td->td_proc->p_comm, ar->k_ar.ar_subj_comm, MAXCOMLEN); 190155406Srwatson 191155406Srwatson return (0); 192155406Srwatson} 193155406Srwatson 194155192Srwatsonstatic void 195155406Srwatsonaudit_record_dtor(void *mem, int size, void *arg) 196155192Srwatson{ 197155406Srwatson struct kaudit_record *ar; 198155192Srwatson 199155406Srwatson KASSERT(sizeof(*ar) == size, ("audit_record_dtor: wrong size")); 200155406Srwatson 201155406Srwatson ar = mem; 202155406Srwatson if (ar->k_ar.ar_arg_upath1 != NULL) 203155192Srwatson free(ar->k_ar.ar_arg_upath1, M_AUDITPATH); 204155406Srwatson if (ar->k_ar.ar_arg_upath2 != NULL) 205155192Srwatson free(ar->k_ar.ar_arg_upath2, M_AUDITPATH); 206155406Srwatson if (ar->k_ar.ar_arg_text != NULL) 207155192Srwatson free(ar->k_ar.ar_arg_text, M_AUDITTEXT); 208155406Srwatson if (ar->k_udata != NULL) 209155192Srwatson free(ar->k_udata, M_AUDITDATA); 210155192Srwatson} 211155192Srwatson 212155192Srwatson/* 213155192Srwatson * Initialize the Audit subsystem: configuration state, work queue, 214155192Srwatson * synchronization primitives, worker thread, and trigger device node. Also 215155192Srwatson * call into the BSM assembly code to initialize it. 216155192Srwatson */ 217155192Srwatsonstatic void 218155192Srwatsonaudit_init(void) 219155192Srwatson{ 220155192Srwatson 221155192Srwatson printf("Security auditing service present\n"); 222155192Srwatson audit_enabled = 0; 223155192Srwatson audit_suspended = 0; 224155192Srwatson audit_panic_on_write_fail = 0; 225155192Srwatson audit_fail_stop = 0; 226155192Srwatson audit_in_failure = 0; 227155192Srwatson 228155192Srwatson audit_fstat.af_filesz = 0; /* '0' means unset, unbounded */ 229156889Srwatson audit_fstat.af_currsz = 0; 230155192Srwatson audit_nae_mask.am_success = AU_NULL; 231155192Srwatson audit_nae_mask.am_failure = AU_NULL; 232155192Srwatson 233155192Srwatson TAILQ_INIT(&audit_q); 234155192Srwatson audit_q_len = 0; 235155192Srwatson audit_pre_q_len = 0; 236155192Srwatson audit_qctrl.aq_hiwater = AQ_HIWATER; 237155192Srwatson audit_qctrl.aq_lowater = AQ_LOWATER; 238155192Srwatson audit_qctrl.aq_bufsz = AQ_BUFSZ; 239155192Srwatson audit_qctrl.aq_minfree = AU_FS_MINFREE; 240155192Srwatson 241155192Srwatson mtx_init(&audit_mtx, "audit_mtx", NULL, MTX_DEF); 242155192Srwatson cv_init(&audit_cv, "audit_cv"); 243155192Srwatson cv_init(&audit_commit_cv, "audit_commit_cv"); 244155192Srwatson cv_init(&audit_fail_cv, "audit_fail_cv"); 245155192Srwatson 246155406Srwatson audit_record_zone = uma_zcreate("audit_record_zone", 247155406Srwatson sizeof(struct kaudit_record), audit_record_ctor, 248155406Srwatson audit_record_dtor, NULL, NULL, UMA_ALIGN_PTR, 0); 249155406Srwatson 250155192Srwatson /* Initialize the BSM audit subsystem. */ 251155192Srwatson kau_init(); 252155192Srwatson 253155192Srwatson audit_trigger_init(); 254155192Srwatson 255155192Srwatson /* Register shutdown handler. */ 256155192Srwatson EVENTHANDLER_REGISTER(shutdown_pre_sync, audit_shutdown, NULL, 257155192Srwatson SHUTDOWN_PRI_FIRST); 258155192Srwatson 259156888Srwatson /* Start audit worker thread. */ 260156888Srwatson audit_worker_init(); 261155192Srwatson} 262155192Srwatson 263155192SrwatsonSYSINIT(audit_init, SI_SUB_AUDIT, SI_ORDER_FIRST, audit_init, NULL) 264155192Srwatson 265155192Srwatson/* 266155192Srwatson * Drain the audit queue and close the log at shutdown. Note that this can 267155192Srwatson * be called both from the system shutdown path and also from audit 268155192Srwatson * configuration syscalls, so 'arg' and 'howto' are ignored. 269155192Srwatson */ 270155192Srwatsonvoid 271155192Srwatsonaudit_shutdown(void *arg, int howto) 272155192Srwatson{ 273155192Srwatson 274155192Srwatson audit_rotate_vnode(NULL, NULL); 275155192Srwatson} 276155192Srwatson 277155192Srwatson/* 278155192Srwatson * Return the current thread's audit record, if any. 279155192Srwatson */ 280155192Srwatson__inline__ struct kaudit_record * 281155192Srwatsoncurrecord(void) 282155192Srwatson{ 283155192Srwatson 284155192Srwatson return (curthread->td_ar); 285155192Srwatson} 286155192Srwatson 287155192Srwatson/* 288155192Srwatson * MPSAFE 289155192Srwatson * 290155192Srwatson * XXXAUDIT: There are a number of races present in the code below due to 291155192Srwatson * release and re-grab of the mutex. The code should be revised to become 292155192Srwatson * slightly less racy. 293155192Srwatson * 294155192Srwatson * XXXAUDIT: Shouldn't there be logic here to sleep waiting on available 295155192Srwatson * pre_q space, suspending the system call until there is room? 296155192Srwatson */ 297155192Srwatsonstruct kaudit_record * 298155192Srwatsonaudit_new(int event, struct thread *td) 299155192Srwatson{ 300155192Srwatson struct kaudit_record *ar; 301155192Srwatson int no_record; 302155192Srwatson 303155406Srwatson mtx_lock(&audit_mtx); 304155406Srwatson no_record = (audit_suspended || !audit_enabled); 305155406Srwatson mtx_unlock(&audit_mtx); 306155406Srwatson if (no_record) 307155406Srwatson return (NULL); 308155192Srwatson 309155192Srwatson /* 310155192Srwatson * XXX: The number of outstanding uncommitted audit records is 311155406Srwatson * limited to the number of concurrent threads servicing system 312155192Srwatson * calls in the kernel. 313155192Srwatson */ 314155406Srwatson ar = uma_zalloc_arg(audit_record_zone, td, M_WAITOK); 315155406Srwatson ar->k_ar.ar_event = event; 316155192Srwatson 317155192Srwatson mtx_lock(&audit_mtx); 318155192Srwatson audit_pre_q_len++; 319155192Srwatson mtx_unlock(&audit_mtx); 320155192Srwatson 321155192Srwatson return (ar); 322155192Srwatson} 323155192Srwatson 324156888Srwatsonvoid 325156888Srwatsonaudit_free(struct kaudit_record *ar) 326156888Srwatson{ 327156888Srwatson 328156888Srwatson uma_zfree(audit_record_zone, ar); 329156888Srwatson} 330156888Srwatson 331155192Srwatson/* 332155192Srwatson * MPSAFE 333155192Srwatson */ 334155192Srwatsonvoid 335155192Srwatsonaudit_commit(struct kaudit_record *ar, int error, int retval) 336155192Srwatson{ 337155192Srwatson int sorf; 338155192Srwatson struct au_mask *aumask; 339155192Srwatson 340155192Srwatson if (ar == NULL) 341155192Srwatson return; 342155192Srwatson 343155192Srwatson /* 344155192Srwatson * Decide whether to commit the audit record by checking the 345155192Srwatson * error value from the system call and using the appropriate 346155192Srwatson * audit mask. 347155192Srwatson * 348155192Srwatson * XXXAUDIT: Synchronize access to audit_nae_mask? 349155192Srwatson */ 350155192Srwatson if (ar->k_ar.ar_subj_auid == AU_DEFAUDITID) 351155192Srwatson aumask = &audit_nae_mask; 352155192Srwatson else 353155192Srwatson aumask = &ar->k_ar.ar_subj_amask; 354156889Srwatson 355155192Srwatson if (error) 356155192Srwatson sorf = AU_PRS_FAILURE; 357155192Srwatson else 358155192Srwatson sorf = AU_PRS_SUCCESS; 359155192Srwatson 360155192Srwatson switch(ar->k_ar.ar_event) { 361155192Srwatson 362155192Srwatson case AUE_OPEN_RWTC: 363155192Srwatson /* The open syscall always writes a AUE_OPEN_RWTC event; change 364156889Srwatson * it to the proper type of event based on the flags and the 365155192Srwatson * error value. 366155192Srwatson */ 367155192Srwatson ar->k_ar.ar_event = flags_and_error_to_openevent( 368155192Srwatson ar->k_ar.ar_arg_fflags, error); 369155192Srwatson break; 370155192Srwatson 371155192Srwatson case AUE_SYSCTL: 372155192Srwatson ar->k_ar.ar_event = ctlname_to_sysctlevent( 373155192Srwatson ar->k_ar.ar_arg_ctlname, ar->k_ar.ar_valid_arg); 374155192Srwatson break; 375155192Srwatson 376155192Srwatson case AUE_AUDITON: 377155192Srwatson /* Convert the auditon() command to an event */ 378155192Srwatson ar->k_ar.ar_event = auditon_command_event(ar->k_ar.ar_arg_cmd); 379155192Srwatson break; 380155192Srwatson } 381155192Srwatson 382155192Srwatson if (au_preselect(ar->k_ar.ar_event, aumask, sorf) != 0) 383155192Srwatson ar->k_ar_commit |= AR_COMMIT_KERNEL; 384155192Srwatson 385155406Srwatson /* 386155406Srwatson * XXXRW: Why is this necessary? Should we ever accept a record that 387155406Srwatson * we're not willing to commit? 388155406Srwatson */ 389155192Srwatson if ((ar->k_ar_commit & (AR_COMMIT_USER | AR_COMMIT_KERNEL)) == 0) { 390155192Srwatson mtx_lock(&audit_mtx); 391155192Srwatson audit_pre_q_len--; 392155192Srwatson mtx_unlock(&audit_mtx); 393155406Srwatson uma_zfree(audit_record_zone, ar); 394155192Srwatson return; 395155192Srwatson } 396155192Srwatson 397155192Srwatson ar->k_ar.ar_errno = error; 398155192Srwatson ar->k_ar.ar_retval = retval; 399155192Srwatson 400155192Srwatson /* 401155192Srwatson * We might want to do some system-wide post-filtering 402155192Srwatson * here at some point. 403155192Srwatson */ 404155192Srwatson 405155192Srwatson /* 406155192Srwatson * Timestamp system call end. 407155192Srwatson */ 408155192Srwatson nanotime(&ar->k_ar.ar_endtime); 409155192Srwatson 410155192Srwatson mtx_lock(&audit_mtx); 411155192Srwatson 412155192Srwatson /* 413155192Srwatson * Note: it could be that some records initiated while audit was 414155192Srwatson * enabled should still be committed? 415155192Srwatson */ 416155192Srwatson if (audit_suspended || !audit_enabled) { 417155192Srwatson audit_pre_q_len--; 418155192Srwatson mtx_unlock(&audit_mtx); 419155406Srwatson uma_zfree(audit_record_zone, ar); 420155192Srwatson return; 421155192Srwatson } 422156889Srwatson 423155192Srwatson /* 424155192Srwatson * Constrain the number of committed audit records based on 425155192Srwatson * the configurable parameter. 426155192Srwatson */ 427155192Srwatson while (audit_q_len >= audit_qctrl.aq_hiwater) { 428155192Srwatson AUDIT_PRINTF(("audit_commit: sleeping to wait for " 429155192Srwatson "audit queue to drain below high water mark\n")); 430155192Srwatson cv_wait(&audit_commit_cv, &audit_mtx); 431155192Srwatson AUDIT_PRINTF(("audit_commit: woke up waiting for " 432155192Srwatson "audit queue draining\n")); 433155192Srwatson } 434155192Srwatson 435155192Srwatson TAILQ_INSERT_TAIL(&audit_q, ar, k_q); 436155192Srwatson audit_q_len++; 437155192Srwatson audit_pre_q_len--; 438155192Srwatson cv_signal(&audit_cv); 439155192Srwatson mtx_unlock(&audit_mtx); 440155192Srwatson} 441155192Srwatson 442155192Srwatson/* 443155192Srwatson * audit_syscall_enter() is called on entry to each system call. It is 444155192Srwatson * responsible for deciding whether or not to audit the call (preselection), 445155192Srwatson * and if so, allocating a per-thread audit record. audit_new() will fill in 446155192Srwatson * basic thread/credential properties. 447155192Srwatson */ 448155192Srwatsonvoid 449155192Srwatsonaudit_syscall_enter(unsigned short code, struct thread *td) 450155192Srwatson{ 451155192Srwatson int audit_event; 452155192Srwatson struct au_mask *aumask; 453155192Srwatson 454155192Srwatson KASSERT(td->td_ar == NULL, ("audit_syscall_enter: td->td_ar != NULL")); 455155192Srwatson 456155192Srwatson /* 457155192Srwatson * In FreeBSD, each ABI has its own system call table, and hence 458155192Srwatson * mapping of system call codes to audit events. Convert the code to 459155192Srwatson * an audit event identifier using the process system call table 460155192Srwatson * reference. In Darwin, there's only one, so we use the global 461155192Srwatson * symbol for the system call table. 462155192Srwatson * 463155192Srwatson * XXXAUDIT: Should we audit that a bad system call was made, and if 464155192Srwatson * so, how? 465155192Srwatson */ 466155192Srwatson if (code >= td->td_proc->p_sysent->sv_size) 467155192Srwatson return; 468155192Srwatson 469155192Srwatson audit_event = td->td_proc->p_sysent->sv_table[code].sy_auevent; 470155192Srwatson if (audit_event == AUE_NULL) 471155192Srwatson return; 472155192Srwatson 473155192Srwatson /* 474155192Srwatson * Check which audit mask to use; either the kernel non-attributable 475155192Srwatson * event mask or the process audit mask. 476155192Srwatson */ 477155192Srwatson if (td->td_proc->p_au->ai_auid == AU_DEFAUDITID) 478155192Srwatson aumask = &audit_nae_mask; 479155192Srwatson else 480155192Srwatson aumask = &td->td_proc->p_au->ai_mask; 481156889Srwatson 482155192Srwatson /* 483156889Srwatson * Allocate an audit record, if preselection allows it, and store 484155192Srwatson * in the thread for later use. 485155192Srwatson */ 486155192Srwatson if (au_preselect(audit_event, aumask, 487155192Srwatson AU_PRS_FAILURE | AU_PRS_SUCCESS)) { 488155192Srwatson /* 489155192Srwatson * If we're out of space and need to suspend unprivileged 490155192Srwatson * processes, do that here rather than trying to allocate 491155192Srwatson * another audit record. 492155192Srwatson * 493155192Srwatson * XXXRW: We might wish to be able to continue here in the 494155192Srwatson * future, if the system recovers. That should be possible 495155192Srwatson * by means of checking the condition in a loop around 496155192Srwatson * cv_wait(). It might be desirable to reevaluate whether an 497155192Srwatson * audit record is still required for this event by 498155192Srwatson * re-calling au_preselect(). 499155192Srwatson */ 500155192Srwatson if (audit_in_failure && suser(td) != 0) { 501155192Srwatson cv_wait(&audit_fail_cv, &audit_mtx); 502155192Srwatson panic("audit_failing_stop: thread continued"); 503155192Srwatson } 504155192Srwatson td->td_ar = audit_new(audit_event, td); 505155192Srwatson } else 506155192Srwatson td->td_ar = NULL; 507155192Srwatson} 508155192Srwatson 509155192Srwatson/* 510155192Srwatson * audit_syscall_exit() is called from the return of every system call, or in 511155192Srwatson * the event of exit1(), during the execution of exit1(). It is responsible 512155192Srwatson * for committing the audit record, if any, along with return condition. 513155192Srwatson */ 514155192Srwatsonvoid 515155192Srwatsonaudit_syscall_exit(int error, struct thread *td) 516155192Srwatson{ 517155192Srwatson int retval; 518155192Srwatson 519155192Srwatson /* 520155192Srwatson * Commit the audit record as desired; once we pass the record 521155192Srwatson * into audit_commit(), the memory is owned by the audit 522155192Srwatson * subsystem. 523155192Srwatson * The return value from the system call is stored on the user 524155192Srwatson * thread. If there was an error, the return value is set to -1, 525155192Srwatson * imitating the behavior of the cerror routine. 526155192Srwatson */ 527155192Srwatson if (error) 528155192Srwatson retval = -1; 529155192Srwatson else 530155192Srwatson retval = td->td_retval[0]; 531155192Srwatson 532155192Srwatson audit_commit(td->td_ar, error, retval); 533155192Srwatson if (td->td_ar != NULL) 534156889Srwatson AUDIT_PRINTF(("audit record committed by pid %d\n", 535155192Srwatson td->td_proc->p_pid)); 536155192Srwatson td->td_ar = NULL; 537155192Srwatson 538155192Srwatson} 539155192Srwatson 540155192Srwatson/* 541155192Srwatson * Allocate storage for a new process (init, or otherwise). 542155192Srwatson */ 543155192Srwatsonvoid 544155192Srwatsonaudit_proc_alloc(struct proc *p) 545155192Srwatson{ 546155192Srwatson 547155192Srwatson KASSERT(p->p_au == NULL, ("audit_proc_alloc: p->p_au != NULL (%d)", 548155192Srwatson p->p_pid)); 549155192Srwatson p->p_au = malloc(sizeof(*(p->p_au)), M_AUDITPROC, M_WAITOK); 550155192Srwatson /* XXXAUDIT: Zero? Slab allocate? */ 551155192Srwatson //printf("audit_proc_alloc: pid %d p_au %p\n", p->p_pid, p->p_au); 552155192Srwatson} 553155192Srwatson 554155195Srwatson/* 555155195Srwatson * Allocate storage for a new thread. 556155195Srwatson */ 557155195Srwatsonvoid 558155195Srwatsonaudit_thread_alloc(struct thread *td) 559155195Srwatson{ 560155195Srwatson 561155195Srwatson td->td_ar = NULL; 562155195Srwatson} 563155195Srwatson 564155353Srwatson/* 565155353Srwatson * Thread destruction. 566155353Srwatson */ 567155353Srwatsonvoid 568155353Srwatsonaudit_thread_free(struct thread *td) 569155353Srwatson{ 570155353Srwatson 571155353Srwatson KASSERT(td->td_ar == NULL, ("audit_thread_free: td_ar != NULL")); 572155353Srwatson} 573155353Srwatson 574156889Srwatson/* 575156889Srwatson * Initialize the audit information for the a process, presumably the first 576155192Srwatson * process in the system. 577156889Srwatson * XXX It is not clear what the initial values should be for audit ID, 578156889Srwatson * session ID, etc. 579155192Srwatson */ 580155192Srwatsonvoid 581155192Srwatsonaudit_proc_kproc0(struct proc *p) 582155192Srwatson{ 583155192Srwatson 584155192Srwatson KASSERT(p->p_au != NULL, ("audit_proc_kproc0: p->p_au == NULL (%d)", 585155192Srwatson p->p_pid)); 586155192Srwatson //printf("audit_proc_kproc0: pid %d p_au %p\n", p->p_pid, p->p_au); 587155192Srwatson bzero(p->p_au, sizeof(*(p)->p_au)); 588155192Srwatson} 589155192Srwatson 590155192Srwatsonvoid 591155192Srwatsonaudit_proc_init(struct proc *p) 592155192Srwatson{ 593155192Srwatson 594155192Srwatson KASSERT(p->p_au != NULL, ("audit_proc_init: p->p_au == NULL (%d)", 595155192Srwatson p->p_pid)); 596155192Srwatson //printf("audit_proc_init: pid %d p_au %p\n", p->p_pid, p->p_au); 597155192Srwatson bzero(p->p_au, sizeof(*(p)->p_au)); 598155558Srwatson p->p_au->ai_auid = AU_DEFAUDITID; 599155192Srwatson} 600155192Srwatson 601156889Srwatson/* 602155192Srwatson * Copy the audit info from the parent process to the child process when 603155192Srwatson * a fork takes place. 604155192Srwatson */ 605155192Srwatsonvoid 606155192Srwatsonaudit_proc_fork(struct proc *parent, struct proc *child) 607155192Srwatson{ 608155192Srwatson 609155192Srwatson PROC_LOCK_ASSERT(parent, MA_OWNED); 610155192Srwatson PROC_LOCK_ASSERT(child, MA_OWNED); 611155192Srwatson KASSERT(parent->p_au != NULL, 612155192Srwatson ("audit_proc_fork: parent->p_au == NULL (%d)", parent->p_pid)); 613155192Srwatson KASSERT(child->p_au != NULL, 614155192Srwatson ("audit_proc_fork: child->p_au == NULL (%d)", child->p_pid)); 615155192Srwatson //printf("audit_proc_fork: parent pid %d p_au %p\n", parent->p_pid, 616155192Srwatson // parent->p_au); 617155192Srwatson //printf("audit_proc_fork: child pid %d p_au %p\n", child->p_pid, 618155192Srwatson // child->p_au); 619155192Srwatson bcopy(parent->p_au, child->p_au, sizeof(*child->p_au)); 620155192Srwatson /* 621155192Srwatson * XXXAUDIT: Zero pointers to external memory, or assert they are 622155192Srwatson * zero? 623155192Srwatson */ 624155192Srwatson} 625155192Srwatson 626155192Srwatson/* 627156889Srwatson * Free the auditing structure for the process. 628155192Srwatson */ 629155192Srwatsonvoid 630155192Srwatsonaudit_proc_free(struct proc *p) 631155192Srwatson{ 632155192Srwatson 633155192Srwatson KASSERT(p->p_au != NULL, ("p->p_au == NULL (%d)", p->p_pid)); 634155192Srwatson //printf("audit_proc_free: pid %d p_au %p\n", p->p_pid, p->p_au); 635155192Srwatson /* 636155192Srwatson * XXXAUDIT: Assert that external memory pointers are NULL? 637155192Srwatson */ 638155192Srwatson free(p->p_au, M_AUDITPROC); 639155192Srwatson p->p_au = NULL; 640155192Srwatson} 641