1181053Srwatson/*- 2180701Srwatson * Copyright (c) 1999-2005 Apple Inc. 3170407Srwatson * Copyright (c) 2006-2007 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. 14180701Srwatson * 3. Neither the name of Apple 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 31178186Srwatson#include <sys/cdefs.h> 32178186Srwatson__FBSDID("$FreeBSD$"); 33178186Srwatson 34155192Srwatson#include <sys/param.h> 35155192Srwatson#include <sys/condvar.h> 36155192Srwatson#include <sys/conf.h> 37155192Srwatson#include <sys/file.h> 38155192Srwatson#include <sys/filedesc.h> 39155192Srwatson#include <sys/fcntl.h> 40155192Srwatson#include <sys/ipc.h> 41245573Scsjp#include <sys/jail.h> 42155192Srwatson#include <sys/kernel.h> 43155192Srwatson#include <sys/kthread.h> 44155192Srwatson#include <sys/malloc.h> 45155192Srwatson#include <sys/mount.h> 46155192Srwatson#include <sys/namei.h> 47164033Srwatson#include <sys/priv.h> 48155192Srwatson#include <sys/proc.h> 49155192Srwatson#include <sys/queue.h> 50155192Srwatson#include <sys/socket.h> 51155192Srwatson#include <sys/socketvar.h> 52155192Srwatson#include <sys/protosw.h> 53155192Srwatson#include <sys/domain.h> 54171144Srwatson#include <sys/sysctl.h> 55155192Srwatson#include <sys/sysproto.h> 56155192Srwatson#include <sys/sysent.h> 57155192Srwatson#include <sys/systm.h> 58155192Srwatson#include <sys/ucred.h> 59155192Srwatson#include <sys/uio.h> 60155192Srwatson#include <sys/un.h> 61155192Srwatson#include <sys/unistd.h> 62155192Srwatson#include <sys/vnode.h> 63155192Srwatson 64155406Srwatson#include <bsm/audit.h> 65156291Srwatson#include <bsm/audit_internal.h> 66155406Srwatson#include <bsm/audit_kevents.h> 67155406Srwatson 68155192Srwatson#include <netinet/in.h> 69155192Srwatson#include <netinet/in_pcb.h> 70155192Srwatson 71155192Srwatson#include <security/audit/audit.h> 72155192Srwatson#include <security/audit/audit_private.h> 73155192Srwatson 74155406Srwatson#include <vm/uma.h> 75155406Srwatson 76219028SnetchildFEATURE(audit, "BSM audit support"); 77219028Snetchild 78156888Srwatsonstatic uma_zone_t audit_record_zone; 79170407Srwatsonstatic MALLOC_DEFINE(M_AUDITCRED, "audit_cred", "Audit cred storage"); 80155192SrwatsonMALLOC_DEFINE(M_AUDITDATA, "audit_data", "Audit data storage"); 81155192SrwatsonMALLOC_DEFINE(M_AUDITPATH, "audit_path", "Audit path storage"); 82155192SrwatsonMALLOC_DEFINE(M_AUDITTEXT, "audit_text", "Audit text storage"); 83195177SssonMALLOC_DEFINE(M_AUDITGIDSET, "audit_gidset", "Audit GID set storage"); 84155192Srwatson 85227309Sedstatic SYSCTL_NODE(_security, OID_AUTO, audit, CTLFLAG_RW, 0, 86171144Srwatson "TrustedBSD audit controls"); 87171144Srwatson 88155192Srwatson/* 89170196Srwatson * Audit control settings that are set/read by system calls and are hence 90170196Srwatson * non-static. 91170196Srwatson * 92155192Srwatson * Define the audit control flags. 93155192Srwatson */ 94156889Srwatsonint audit_enabled; 95156889Srwatsonint audit_suspended; 96155192Srwatson 97155192Srwatson/* 98162176Srwatson * Flags controlling behavior in low storage situations. Should we panic if 99162176Srwatson * a write fails? Should we fail stop if we're out of disk space? 100155192Srwatson */ 101156889Srwatsonint audit_panic_on_write_fail; 102156889Srwatsonint audit_fail_stop; 103161813Swsalamonint audit_argv; 104161813Swsalamonint audit_arge; 105155192Srwatson 106155192Srwatson/* 107155192Srwatson * Are we currently "failing stop" due to out of disk space? 108155192Srwatson */ 109156889Srwatsonint audit_in_failure; 110155192Srwatson 111155192Srwatson/* 112170691Srwatson * Global audit statistics. 113155192Srwatson */ 114156889Srwatsonstruct audit_fstat audit_fstat; 115155192Srwatson 116155192Srwatson/* 117155192Srwatson * Preselection mask for non-attributable events. 118155192Srwatson */ 119156889Srwatsonstruct au_mask audit_nae_mask; 120155192Srwatson 121155192Srwatson/* 122155192Srwatson * Mutex to protect global variables shared between various threads and 123155192Srwatson * processes. 124155192Srwatson */ 125156889Srwatsonstruct mtx audit_mtx; 126155192Srwatson 127155192Srwatson/* 128170196Srwatson * Queue of audit records ready for delivery to disk. We insert new records 129170196Srwatson * at the tail, and remove records from the head. Also, a count of the 130170196Srwatson * number of records used for checking queue depth. In addition, a counter 131170196Srwatson * of records that we have allocated but are not yet in the queue, which is 132170196Srwatson * needed to estimate the total size of the combined set of records 133170196Srwatson * outstanding in the system. 134155192Srwatson */ 135156889Srwatsonstruct kaudit_queue audit_q; 136191270Srwatsonint audit_q_len; 137191270Srwatsonint audit_pre_q_len; 138155192Srwatson 139155192Srwatson/* 140155192Srwatson * Audit queue control settings (minimum free, low/high water marks, etc.) 141155192Srwatson */ 142156889Srwatsonstruct au_qctrl audit_qctrl; 143155192Srwatson 144155192Srwatson/* 145170196Srwatson * Condition variable to signal to the worker that it has work to do: either 146170196Srwatson * new records are in the queue, or a log replacement is taking place. 147155192Srwatson */ 148159261Srwatsonstruct cv audit_worker_cv; 149155192Srwatson 150155192Srwatson/* 151159261Srwatson * Condition variable to flag when crossing the low watermark, meaning that 152159261Srwatson * threads blocked due to hitting the high watermark can wake up and continue 153159261Srwatson * to commit records. 154155192Srwatson */ 155159261Srwatsonstruct cv audit_watermark_cv; 156155192Srwatson 157156889Srwatson/* 158156889Srwatson * Condition variable for auditing threads wait on when in fail-stop mode. 159170196Srwatson * Threads wait on this CV forever (and ever), never seeing the light of day 160170196Srwatson * again. 161155192Srwatson */ 162156889Srwatsonstatic struct cv audit_fail_cv; 163155192Srwatson 164155192Srwatson/* 165184856Scsjp * Kernel audit information. This will store the current audit address 166184856Scsjp * or host information that the kernel will use when it's generating 167184856Scsjp * audit records. This data is modified by the A_GET{SET}KAUDIT auditon(2) 168184856Scsjp * command. 169184856Scsjp */ 170184856Scsjpstatic struct auditinfo_addr audit_kinfo; 171184856Scsjpstatic struct rwlock audit_kinfo_lock; 172184856Scsjp 173184857Srwatson#define KINFO_LOCK_INIT() rw_init(&audit_kinfo_lock, \ 174184857Srwatson "audit_kinfo_lock") 175184856Scsjp#define KINFO_RLOCK() rw_rlock(&audit_kinfo_lock) 176184856Scsjp#define KINFO_WLOCK() rw_wlock(&audit_kinfo_lock) 177184856Scsjp#define KINFO_RUNLOCK() rw_runlock(&audit_kinfo_lock) 178184856Scsjp#define KINFO_WUNLOCK() rw_wunlock(&audit_kinfo_lock) 179184856Scsjp 180184856Scsjpvoid 181184856Scsjpaudit_set_kinfo(struct auditinfo_addr *ak) 182184856Scsjp{ 183184856Scsjp 184184856Scsjp KASSERT(ak->ai_termid.at_type == AU_IPv4 || 185184856Scsjp ak->ai_termid.at_type == AU_IPv6, 186184856Scsjp ("audit_set_kinfo: invalid address type")); 187184857Srwatson 188184856Scsjp KINFO_WLOCK(); 189184856Scsjp audit_kinfo = *ak; 190184856Scsjp KINFO_WUNLOCK(); 191184856Scsjp} 192184856Scsjp 193184856Scsjpvoid 194184856Scsjpaudit_get_kinfo(struct auditinfo_addr *ak) 195184856Scsjp{ 196184856Scsjp 197184856Scsjp KASSERT(audit_kinfo.ai_termid.at_type == AU_IPv4 || 198184856Scsjp audit_kinfo.ai_termid.at_type == AU_IPv6, 199184856Scsjp ("audit_set_kinfo: invalid address type")); 200184857Srwatson 201184856Scsjp KINFO_RLOCK(); 202184856Scsjp *ak = audit_kinfo; 203184856Scsjp KINFO_RUNLOCK(); 204184856Scsjp} 205184856Scsjp 206184856Scsjp/* 207155406Srwatson * Construct an audit record for the passed thread. 208155192Srwatson */ 209155406Srwatsonstatic int 210155406Srwatsonaudit_record_ctor(void *mem, int size, void *arg, int flags) 211155406Srwatson{ 212155406Srwatson struct kaudit_record *ar; 213155406Srwatson struct thread *td; 214184948Srwatson struct ucred *cred; 215245573Scsjp struct prison *pr; 216155406Srwatson 217155406Srwatson KASSERT(sizeof(*ar) == size, ("audit_record_ctor: wrong size")); 218155406Srwatson 219155406Srwatson td = arg; 220155406Srwatson ar = mem; 221155406Srwatson bzero(ar, sizeof(*ar)); 222155406Srwatson ar->k_ar.ar_magic = AUDIT_RECORD_MAGIC; 223155406Srwatson nanotime(&ar->k_ar.ar_starttime); 224155406Srwatson 225155406Srwatson /* 226155406Srwatson * Export the subject credential. 227155406Srwatson */ 228184948Srwatson cred = td->td_ucred; 229184948Srwatson cru2x(cred, &ar->k_ar.ar_subj_cred); 230184948Srwatson ar->k_ar.ar_subj_ruid = cred->cr_ruid; 231184948Srwatson ar->k_ar.ar_subj_rgid = cred->cr_rgid; 232184948Srwatson ar->k_ar.ar_subj_egid = cred->cr_groups[0]; 233184948Srwatson ar->k_ar.ar_subj_auid = cred->cr_audit.ai_auid; 234184948Srwatson ar->k_ar.ar_subj_asid = cred->cr_audit.ai_asid; 235155406Srwatson ar->k_ar.ar_subj_pid = td->td_proc->p_pid; 236184948Srwatson ar->k_ar.ar_subj_amask = cred->cr_audit.ai_mask; 237184948Srwatson ar->k_ar.ar_subj_term_addr = cred->cr_audit.ai_termid; 238245573Scsjp /* 239245573Scsjp * If this process is jailed, make sure we capture the name of the 240245573Scsjp * jail so we can use it to generate a zonename token when we covert 241245573Scsjp * this record to BSM. 242245573Scsjp */ 243245573Scsjp if (jailed(cred)) { 244245573Scsjp pr = cred->cr_prison; 245245573Scsjp (void) strlcpy(ar->k_ar.ar_jailname, pr->pr_name, 246245573Scsjp sizeof(ar->k_ar.ar_jailname)); 247245573Scsjp } else 248245573Scsjp ar->k_ar.ar_jailname[0] = '\0'; 249155406Srwatson return (0); 250155406Srwatson} 251155406Srwatson 252155192Srwatsonstatic void 253155406Srwatsonaudit_record_dtor(void *mem, int size, void *arg) 254155192Srwatson{ 255155406Srwatson struct kaudit_record *ar; 256155192Srwatson 257155406Srwatson KASSERT(sizeof(*ar) == size, ("audit_record_dtor: wrong size")); 258155406Srwatson 259155406Srwatson ar = mem; 260155406Srwatson if (ar->k_ar.ar_arg_upath1 != NULL) 261155192Srwatson free(ar->k_ar.ar_arg_upath1, M_AUDITPATH); 262155406Srwatson if (ar->k_ar.ar_arg_upath2 != NULL) 263155192Srwatson free(ar->k_ar.ar_arg_upath2, M_AUDITPATH); 264155406Srwatson if (ar->k_ar.ar_arg_text != NULL) 265155192Srwatson free(ar->k_ar.ar_arg_text, M_AUDITTEXT); 266155406Srwatson if (ar->k_udata != NULL) 267155192Srwatson free(ar->k_udata, M_AUDITDATA); 268161813Swsalamon if (ar->k_ar.ar_arg_argv != NULL) 269161813Swsalamon free(ar->k_ar.ar_arg_argv, M_AUDITTEXT); 270161813Swsalamon if (ar->k_ar.ar_arg_envv != NULL) 271161813Swsalamon free(ar->k_ar.ar_arg_envv, M_AUDITTEXT); 272195177Ssson if (ar->k_ar.ar_arg_groups.gidset != NULL) 273195177Ssson free(ar->k_ar.ar_arg_groups.gidset, M_AUDITGIDSET); 274155192Srwatson} 275155192Srwatson 276155192Srwatson/* 277155192Srwatson * Initialize the Audit subsystem: configuration state, work queue, 278155192Srwatson * synchronization primitives, worker thread, and trigger device node. Also 279155192Srwatson * call into the BSM assembly code to initialize it. 280155192Srwatson */ 281155192Srwatsonstatic void 282155192Srwatsonaudit_init(void) 283155192Srwatson{ 284155192Srwatson 285155192Srwatson audit_enabled = 0; 286155192Srwatson audit_suspended = 0; 287155192Srwatson audit_panic_on_write_fail = 0; 288155192Srwatson audit_fail_stop = 0; 289155192Srwatson audit_in_failure = 0; 290161813Swsalamon audit_argv = 0; 291161813Swsalamon audit_arge = 0; 292155192Srwatson 293170196Srwatson audit_fstat.af_filesz = 0; /* '0' means unset, unbounded. */ 294156889Srwatson audit_fstat.af_currsz = 0; 295173142Srwatson audit_nae_mask.am_success = 0; 296173142Srwatson audit_nae_mask.am_failure = 0; 297155192Srwatson 298155192Srwatson TAILQ_INIT(&audit_q); 299155192Srwatson audit_q_len = 0; 300155192Srwatson audit_pre_q_len = 0; 301155192Srwatson audit_qctrl.aq_hiwater = AQ_HIWATER; 302155192Srwatson audit_qctrl.aq_lowater = AQ_LOWATER; 303155192Srwatson audit_qctrl.aq_bufsz = AQ_BUFSZ; 304155192Srwatson audit_qctrl.aq_minfree = AU_FS_MINFREE; 305155192Srwatson 306184856Scsjp audit_kinfo.ai_termid.at_type = AU_IPv4; 307184856Scsjp audit_kinfo.ai_termid.at_addr[0] = INADDR_ANY; 308184856Scsjp 309155192Srwatson mtx_init(&audit_mtx, "audit_mtx", NULL, MTX_DEF); 310184856Scsjp KINFO_LOCK_INIT(); 311159261Srwatson cv_init(&audit_worker_cv, "audit_worker_cv"); 312159261Srwatson cv_init(&audit_watermark_cv, "audit_watermark_cv"); 313155192Srwatson cv_init(&audit_fail_cv, "audit_fail_cv"); 314155192Srwatson 315159266Srwatson audit_record_zone = uma_zcreate("audit_record", 316155406Srwatson sizeof(struct kaudit_record), audit_record_ctor, 317155406Srwatson audit_record_dtor, NULL, NULL, UMA_ALIGN_PTR, 0); 318155406Srwatson 319155192Srwatson /* Initialize the BSM audit subsystem. */ 320155192Srwatson kau_init(); 321155192Srwatson 322155192Srwatson audit_trigger_init(); 323155192Srwatson 324155192Srwatson /* Register shutdown handler. */ 325155192Srwatson EVENTHANDLER_REGISTER(shutdown_pre_sync, audit_shutdown, NULL, 326155192Srwatson SHUTDOWN_PRI_FIRST); 327155192Srwatson 328156888Srwatson /* Start audit worker thread. */ 329156888Srwatson audit_worker_init(); 330155192Srwatson} 331155192Srwatson 332177253SrwatsonSYSINIT(audit_init, SI_SUB_AUDIT, SI_ORDER_FIRST, audit_init, NULL); 333155192Srwatson 334155192Srwatson/* 335155192Srwatson * Drain the audit queue and close the log at shutdown. Note that this can 336155192Srwatson * be called both from the system shutdown path and also from audit 337155192Srwatson * configuration syscalls, so 'arg' and 'howto' are ignored. 338179517Srwatson * 339179517Srwatson * XXXRW: In FreeBSD 7.x and 8.x, this fails to wait for the record queue to 340179517Srwatson * drain before returning, which could lead to lost records on shutdown. 341155192Srwatson */ 342155192Srwatsonvoid 343155192Srwatsonaudit_shutdown(void *arg, int howto) 344155192Srwatson{ 345155192Srwatson 346155192Srwatson audit_rotate_vnode(NULL, NULL); 347155192Srwatson} 348155192Srwatson 349155192Srwatson/* 350155192Srwatson * Return the current thread's audit record, if any. 351155192Srwatson */ 352169896Srwatsonstruct kaudit_record * 353155192Srwatsoncurrecord(void) 354155192Srwatson{ 355155192Srwatson 356155192Srwatson return (curthread->td_ar); 357155192Srwatson} 358155192Srwatson 359155192Srwatson/* 360155192Srwatson * XXXAUDIT: There are a number of races present in the code below due to 361155192Srwatson * release and re-grab of the mutex. The code should be revised to become 362155192Srwatson * slightly less racy. 363155192Srwatson * 364155192Srwatson * XXXAUDIT: Shouldn't there be logic here to sleep waiting on available 365155192Srwatson * pre_q space, suspending the system call until there is room? 366155192Srwatson */ 367155192Srwatsonstruct kaudit_record * 368155192Srwatsonaudit_new(int event, struct thread *td) 369155192Srwatson{ 370155192Srwatson struct kaudit_record *ar; 371155192Srwatson int no_record; 372155192Srwatson 373155406Srwatson mtx_lock(&audit_mtx); 374155406Srwatson no_record = (audit_suspended || !audit_enabled); 375155406Srwatson mtx_unlock(&audit_mtx); 376155406Srwatson if (no_record) 377155406Srwatson return (NULL); 378155192Srwatson 379155192Srwatson /* 380165604Srwatson * Note: the number of outstanding uncommitted audit records is 381165604Srwatson * limited to the number of concurrent threads servicing system calls 382165604Srwatson * in the kernel. 383155192Srwatson */ 384155406Srwatson ar = uma_zalloc_arg(audit_record_zone, td, M_WAITOK); 385155406Srwatson ar->k_ar.ar_event = event; 386155192Srwatson 387155192Srwatson mtx_lock(&audit_mtx); 388155192Srwatson audit_pre_q_len++; 389155192Srwatson mtx_unlock(&audit_mtx); 390155192Srwatson 391155192Srwatson return (ar); 392155192Srwatson} 393155192Srwatson 394156888Srwatsonvoid 395156888Srwatsonaudit_free(struct kaudit_record *ar) 396156888Srwatson{ 397156888Srwatson 398156888Srwatson uma_zfree(audit_record_zone, ar); 399156888Srwatson} 400156888Srwatson 401155192Srwatsonvoid 402155192Srwatsonaudit_commit(struct kaudit_record *ar, int error, int retval) 403155192Srwatson{ 404159269Srwatson au_event_t event; 405159269Srwatson au_class_t class; 406159269Srwatson au_id_t auid; 407155192Srwatson int sorf; 408155192Srwatson struct au_mask *aumask; 409155192Srwatson 410155192Srwatson if (ar == NULL) 411155192Srwatson return; 412155192Srwatson 413155192Srwatson /* 414170196Srwatson * Decide whether to commit the audit record by checking the error 415170196Srwatson * value from the system call and using the appropriate audit mask. 416155192Srwatson */ 417155192Srwatson if (ar->k_ar.ar_subj_auid == AU_DEFAUDITID) 418155192Srwatson aumask = &audit_nae_mask; 419155192Srwatson else 420155192Srwatson aumask = &ar->k_ar.ar_subj_amask; 421156889Srwatson 422155192Srwatson if (error) 423155192Srwatson sorf = AU_PRS_FAILURE; 424155192Srwatson else 425155192Srwatson sorf = AU_PRS_SUCCESS; 426155192Srwatson 427195925Srwatson /* 428195925Srwatson * syscalls.master sometimes contains a prototype event number, which 429195925Srwatson * we will transform into a more specific event number now that we 430195925Srwatson * have more complete information gathered during the system call. 431195925Srwatson */ 432155192Srwatson switch(ar->k_ar.ar_event) { 433155192Srwatson case AUE_OPEN_RWTC: 434176690Srwatson ar->k_ar.ar_event = audit_flags_and_error_to_openevent( 435155192Srwatson ar->k_ar.ar_arg_fflags, error); 436155192Srwatson break; 437155192Srwatson 438195925Srwatson case AUE_OPENAT_RWTC: 439195925Srwatson ar->k_ar.ar_event = audit_flags_and_error_to_openatevent( 440195925Srwatson ar->k_ar.ar_arg_fflags, error); 441195925Srwatson break; 442195925Srwatson 443155192Srwatson case AUE_SYSCTL: 444176690Srwatson ar->k_ar.ar_event = audit_ctlname_to_sysctlevent( 445155192Srwatson ar->k_ar.ar_arg_ctlname, ar->k_ar.ar_valid_arg); 446155192Srwatson break; 447155192Srwatson 448155192Srwatson case AUE_AUDITON: 449170585Srwatson /* Convert the auditon() command to an event. */ 450155192Srwatson ar->k_ar.ar_event = auditon_command_event(ar->k_ar.ar_arg_cmd); 451155192Srwatson break; 452155192Srwatson } 453155192Srwatson 454159269Srwatson auid = ar->k_ar.ar_subj_auid; 455159269Srwatson event = ar->k_ar.ar_event; 456159269Srwatson class = au_event_class(event); 457155192Srwatson 458159269Srwatson ar->k_ar_commit |= AR_COMMIT_KERNEL; 459159269Srwatson if (au_preselect(event, class, aumask, sorf) != 0) 460159269Srwatson ar->k_ar_commit |= AR_PRESELECT_TRAIL; 461159269Srwatson if (audit_pipe_preselect(auid, event, class, sorf, 462159269Srwatson ar->k_ar_commit & AR_PRESELECT_TRAIL) != 0) 463159269Srwatson ar->k_ar_commit |= AR_PRESELECT_PIPE; 464162380Scsjp if ((ar->k_ar_commit & (AR_PRESELECT_TRAIL | AR_PRESELECT_PIPE | 465162380Scsjp AR_PRESELECT_USER_TRAIL | AR_PRESELECT_USER_PIPE)) == 0) { 466155192Srwatson mtx_lock(&audit_mtx); 467155192Srwatson audit_pre_q_len--; 468155192Srwatson mtx_unlock(&audit_mtx); 469159275Srwatson audit_free(ar); 470155192Srwatson return; 471155192Srwatson } 472155192Srwatson 473155192Srwatson ar->k_ar.ar_errno = error; 474155192Srwatson ar->k_ar.ar_retval = retval; 475155192Srwatson nanotime(&ar->k_ar.ar_endtime); 476155192Srwatson 477155192Srwatson /* 478155192Srwatson * Note: it could be that some records initiated while audit was 479155192Srwatson * enabled should still be committed? 480155192Srwatson */ 481170196Srwatson mtx_lock(&audit_mtx); 482155192Srwatson if (audit_suspended || !audit_enabled) { 483155192Srwatson audit_pre_q_len--; 484155192Srwatson mtx_unlock(&audit_mtx); 485159275Srwatson audit_free(ar); 486155192Srwatson return; 487155192Srwatson } 488156889Srwatson 489155192Srwatson /* 490170182Srwatson * Constrain the number of committed audit records based on the 491170182Srwatson * configurable parameter. 492155192Srwatson */ 493170182Srwatson while (audit_q_len >= audit_qctrl.aq_hiwater) 494159261Srwatson cv_wait(&audit_watermark_cv, &audit_mtx); 495155192Srwatson 496155192Srwatson TAILQ_INSERT_TAIL(&audit_q, ar, k_q); 497155192Srwatson audit_q_len++; 498155192Srwatson audit_pre_q_len--; 499159261Srwatson cv_signal(&audit_worker_cv); 500155192Srwatson mtx_unlock(&audit_mtx); 501155192Srwatson} 502155192Srwatson 503155192Srwatson/* 504155192Srwatson * audit_syscall_enter() is called on entry to each system call. It is 505155192Srwatson * responsible for deciding whether or not to audit the call (preselection), 506155192Srwatson * and if so, allocating a per-thread audit record. audit_new() will fill in 507155192Srwatson * basic thread/credential properties. 508155192Srwatson */ 509155192Srwatsonvoid 510155192Srwatsonaudit_syscall_enter(unsigned short code, struct thread *td) 511155192Srwatson{ 512155192Srwatson struct au_mask *aumask; 513159269Srwatson au_class_t class; 514159269Srwatson au_event_t event; 515159269Srwatson au_id_t auid; 516155192Srwatson 517155192Srwatson KASSERT(td->td_ar == NULL, ("audit_syscall_enter: td->td_ar != NULL")); 518189570Srwatson KASSERT((td->td_pflags & TDP_AUDITREC) == 0, 519189570Srwatson ("audit_syscall_enter: TDP_AUDITREC set")); 520155192Srwatson 521155192Srwatson /* 522155192Srwatson * In FreeBSD, each ABI has its own system call table, and hence 523155192Srwatson * mapping of system call codes to audit events. Convert the code to 524155192Srwatson * an audit event identifier using the process system call table 525155192Srwatson * reference. In Darwin, there's only one, so we use the global 526162950Srwatson * symbol for the system call table. No audit record is generated 527162950Srwatson * for bad system calls, as no operation has been performed. 528155192Srwatson */ 529155192Srwatson if (code >= td->td_proc->p_sysent->sv_size) 530155192Srwatson return; 531155192Srwatson 532159269Srwatson event = td->td_proc->p_sysent->sv_table[code].sy_auevent; 533159269Srwatson if (event == AUE_NULL) 534155192Srwatson return; 535155192Srwatson 536155192Srwatson /* 537155192Srwatson * Check which audit mask to use; either the kernel non-attributable 538155192Srwatson * event mask or the process audit mask. 539155192Srwatson */ 540170407Srwatson auid = td->td_ucred->cr_audit.ai_auid; 541159269Srwatson if (auid == AU_DEFAUDITID) 542155192Srwatson aumask = &audit_nae_mask; 543155192Srwatson else 544170407Srwatson aumask = &td->td_ucred->cr_audit.ai_mask; 545156889Srwatson 546155192Srwatson /* 547170196Srwatson * Allocate an audit record, if preselection allows it, and store in 548170196Srwatson * the thread for later use. 549155192Srwatson */ 550159269Srwatson class = au_event_class(event); 551159269Srwatson if (au_preselect(event, class, aumask, AU_PRS_BOTH)) { 552155192Srwatson /* 553155192Srwatson * If we're out of space and need to suspend unprivileged 554155192Srwatson * processes, do that here rather than trying to allocate 555155192Srwatson * another audit record. 556155192Srwatson * 557165604Srwatson * Note: we might wish to be able to continue here in the 558155192Srwatson * future, if the system recovers. That should be possible 559155192Srwatson * by means of checking the condition in a loop around 560155192Srwatson * cv_wait(). It might be desirable to reevaluate whether an 561155192Srwatson * audit record is still required for this event by 562155192Srwatson * re-calling au_preselect(). 563155192Srwatson */ 564164033Srwatson if (audit_in_failure && 565164033Srwatson priv_check(td, PRIV_AUDIT_FAILSTOP) != 0) { 566155192Srwatson cv_wait(&audit_fail_cv, &audit_mtx); 567155192Srwatson panic("audit_failing_stop: thread continued"); 568155192Srwatson } 569159269Srwatson td->td_ar = audit_new(event, td); 570189570Srwatson if (td->td_ar != NULL) 571189570Srwatson td->td_pflags |= TDP_AUDITREC; 572189570Srwatson } else if (audit_pipe_preselect(auid, event, class, AU_PRS_BOTH, 0)) { 573159269Srwatson td->td_ar = audit_new(event, td); 574189570Srwatson if (td->td_ar != NULL) 575189570Srwatson td->td_pflags |= TDP_AUDITREC; 576189570Srwatson } else 577155192Srwatson td->td_ar = NULL; 578155192Srwatson} 579155192Srwatson 580155192Srwatson/* 581155192Srwatson * audit_syscall_exit() is called from the return of every system call, or in 582155192Srwatson * the event of exit1(), during the execution of exit1(). It is responsible 583155192Srwatson * for committing the audit record, if any, along with return condition. 584155192Srwatson */ 585155192Srwatsonvoid 586155192Srwatsonaudit_syscall_exit(int error, struct thread *td) 587155192Srwatson{ 588155192Srwatson int retval; 589155192Srwatson 590155192Srwatson /* 591170196Srwatson * Commit the audit record as desired; once we pass the record into 592170196Srwatson * audit_commit(), the memory is owned by the audit subsystem. The 593170196Srwatson * return value from the system call is stored on the user thread. 594170196Srwatson * If there was an error, the return value is set to -1, imitating 595170196Srwatson * the behavior of the cerror routine. 596155192Srwatson */ 597155192Srwatson if (error) 598155192Srwatson retval = -1; 599155192Srwatson else 600155192Srwatson retval = td->td_retval[0]; 601155192Srwatson 602155192Srwatson audit_commit(td->td_ar, error, retval); 603155192Srwatson td->td_ar = NULL; 604189570Srwatson td->td_pflags &= ~TDP_AUDITREC; 605155192Srwatson} 606155192Srwatson 607155192Srwatsonvoid 608170407Srwatsonaudit_cred_copy(struct ucred *src, struct ucred *dest) 609155192Srwatson{ 610155192Srwatson 611170407Srwatson bcopy(&src->cr_audit, &dest->cr_audit, sizeof(dest->cr_audit)); 612155192Srwatson} 613155192Srwatson 614155195Srwatsonvoid 615170407Srwatsonaudit_cred_destroy(struct ucred *cred) 616155195Srwatson{ 617155195Srwatson 618155195Srwatson} 619155195Srwatson 620155353Srwatsonvoid 621170407Srwatsonaudit_cred_init(struct ucred *cred) 622155353Srwatson{ 623155353Srwatson 624170407Srwatson bzero(&cred->cr_audit, sizeof(cred->cr_audit)); 625155353Srwatson} 626155353Srwatson 627156889Srwatson/* 628162950Srwatson * Initialize audit information for the first kernel process (proc 0) and for 629162950Srwatson * the first user process (init). 630155192Srwatson */ 631155192Srwatsonvoid 632170407Srwatsonaudit_cred_kproc0(struct ucred *cred) 633155192Srwatson{ 634155192Srwatson 635170585Srwatson cred->cr_audit.ai_auid = AU_DEFAUDITID; 636175763Scsjp cred->cr_audit.ai_termid.at_type = AU_IPv4; 637155192Srwatson} 638155192Srwatson 639155192Srwatsonvoid 640170407Srwatsonaudit_cred_proc1(struct ucred *cred) 641155192Srwatson{ 642155192Srwatson 643170407Srwatson cred->cr_audit.ai_auid = AU_DEFAUDITID; 644175763Scsjp cred->cr_audit.ai_termid.at_type = AU_IPv4; 645155192Srwatson} 646155192Srwatson 647155192Srwatsonvoid 648170407Srwatsonaudit_thread_alloc(struct thread *td) 649155192Srwatson{ 650155192Srwatson 651170407Srwatson td->td_ar = NULL; 652155192Srwatson} 653155192Srwatson 654155192Srwatsonvoid 655170407Srwatsonaudit_thread_free(struct thread *td) 656155192Srwatson{ 657155192Srwatson 658170407Srwatson KASSERT(td->td_ar == NULL, ("audit_thread_free: td_ar != NULL")); 659189570Srwatson KASSERT((td->td_pflags & TDP_AUDITREC) == 0, 660189570Srwatson ("audit_thread_free: TDP_AUDITREC set")); 661155192Srwatson} 662172995Scsjp 663172995Scsjpvoid 664172995Scsjpaudit_proc_coredump(struct thread *td, char *path, int errcode) 665172995Scsjp{ 666172995Scsjp struct kaudit_record *ar; 667172995Scsjp struct au_mask *aumask; 668184948Srwatson struct ucred *cred; 669172995Scsjp au_class_t class; 670172995Scsjp int ret, sorf; 671172995Scsjp char **pathp; 672172995Scsjp au_id_t auid; 673172995Scsjp 674174267Swkoszek ret = 0; 675174267Swkoszek 676172995Scsjp /* 677172995Scsjp * Make sure we are using the correct preselection mask. 678172995Scsjp */ 679184948Srwatson cred = td->td_ucred; 680184948Srwatson auid = cred->cr_audit.ai_auid; 681172995Scsjp if (auid == AU_DEFAUDITID) 682172995Scsjp aumask = &audit_nae_mask; 683172995Scsjp else 684184948Srwatson aumask = &cred->cr_audit.ai_mask; 685172995Scsjp /* 686172995Scsjp * It's possible for coredump(9) generation to fail. Make sure that 687172995Scsjp * we handle this case correctly for preselection. 688172995Scsjp */ 689172995Scsjp if (errcode != 0) 690172995Scsjp sorf = AU_PRS_FAILURE; 691172995Scsjp else 692172995Scsjp sorf = AU_PRS_SUCCESS; 693172995Scsjp class = au_event_class(AUE_CORE); 694181604Scsjp if (au_preselect(AUE_CORE, class, aumask, sorf) == 0 && 695181604Scsjp audit_pipe_preselect(auid, AUE_CORE, class, sorf, 0) == 0) 696172995Scsjp return; 697184948Srwatson 698172995Scsjp /* 699172995Scsjp * If we are interested in seeing this audit record, allocate it. 700172995Scsjp * Where possible coredump records should contain a pathname and arg32 701172995Scsjp * (signal) tokens. 702172995Scsjp */ 703172995Scsjp ar = audit_new(AUE_CORE, td); 704253078Savg if (ar == NULL) 705253078Savg return; 706172995Scsjp if (path != NULL) { 707172995Scsjp pathp = &ar->k_ar.ar_arg_upath1; 708172995Scsjp *pathp = malloc(MAXPATHLEN, M_AUDITPATH, M_WAITOK); 709243726Spjd audit_canon_path(td, AT_FDCWD, path, *pathp); 710172995Scsjp ARG_SET_VALID(ar, ARG_UPATH1); 711172995Scsjp } 712172995Scsjp ar->k_ar.ar_arg_signum = td->td_proc->p_sig; 713172995Scsjp ARG_SET_VALID(ar, ARG_SIGNUM); 714172995Scsjp if (errcode != 0) 715172995Scsjp ret = 1; 716172995Scsjp audit_commit(ar, errcode, ret); 717172995Scsjp} 718