1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1999-2009 Apple Inc. 5 * Copyright (c) 2016, 2018 Robert N. M. Watson 6 * All rights reserved. 7 * 8 * Portions of this software were developed by BAE Systems, the University of 9 * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL 10 * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent 11 * Computing (TC) research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of Apple Inc. ("Apple") nor the names of 22 * its contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR 29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 33 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 34 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * This include file contains function prototypes and type definitions used 40 * within the audit implementation. 41 */ 42 43 #ifndef _SECURITY_AUDIT_PRIVATE_H_ 44 #define _SECURITY_AUDIT_PRIVATE_H_ 45 46 #ifndef _KERNEL 47 #error "no user-serviceable parts inside" 48 #endif 49 50 #include <sys/caprights.h> 51 #include <sys/ipc.h> 52 #include <sys/socket.h> 53 #include <sys/ucred.h> 54 55 #ifdef MALLOC_DECLARE 56 MALLOC_DECLARE(M_AUDITBSM); 57 MALLOC_DECLARE(M_AUDITDATA); 58 MALLOC_DECLARE(M_AUDITPATH); 59 MALLOC_DECLARE(M_AUDITTEXT); 60 MALLOC_DECLARE(M_AUDITGIDSET); 61 #endif 62 63 /* 64 * Audit control variables that are usually set/read via system calls and 65 * used to control various aspects of auditing. 66 */ 67 extern struct au_qctrl audit_qctrl; 68 extern struct audit_fstat audit_fstat; 69 extern struct au_mask audit_nae_mask; 70 extern int audit_panic_on_write_fail; 71 extern int audit_fail_stop; 72 extern int audit_argv; 73 extern int audit_arge; 74 75 /* 76 * Success/failure conditions for the conversion of a kernel audit record to 77 * BSM format. 78 */ 79 #define BSM_SUCCESS 0 80 #define BSM_FAILURE 1 81 #define BSM_NOAUDIT 2 82 83 /* 84 * Defines for the kernel audit record k_ar_commit field. Flags are set to 85 * indicate what sort of record it is, and which preselection mechanism 86 * selected it. 87 */ 88 #define AR_COMMIT_KERNEL 0x00000001U 89 #define AR_COMMIT_USER 0x00000010U 90 91 #define AR_PRESELECT_TRAIL 0x00001000U 92 #define AR_PRESELECT_PIPE 0x00002000U 93 94 #define AR_PRESELECT_USER_TRAIL 0x00004000U 95 #define AR_PRESELECT_USER_PIPE 0x00008000U 96 97 #define AR_PRESELECT_DTRACE 0x00010000U 98 99 /* 100 * Audit data is generated as a stream of struct audit_record structures, 101 * linked by struct kaudit_record, and contain storage for possible audit so 102 * that it will not need to be allocated during the processing of a system 103 * call, both improving efficiency and avoiding sleeping at untimely moments. 104 * This structure is converted to BSM format before being written to disk. 105 */ 106 struct vnode_au_info { 107 mode_t vn_mode; 108 uid_t vn_uid; 109 gid_t vn_gid; 110 u_int32_t vn_dev; /* XXX dev_t compatibility */ 111 long vn_fsid; /* XXX uint64_t compatibility */ 112 long vn_fileid; /* XXX ino_t compatibility */ 113 long vn_gen; 114 }; 115 116 struct groupset { 117 gid_t *gidset; 118 u_int gidset_size; 119 }; 120 121 struct socket_au_info { 122 int so_domain; 123 int so_type; 124 int so_protocol; 125 in_addr_t so_raddr; /* Remote address if INET socket. */ 126 in_addr_t so_laddr; /* Local address if INET socket. */ 127 u_short so_rport; /* Remote port. */ 128 u_short so_lport; /* Local port. */ 129 }; 130 131 /* 132 * The following is used for A_OLDSETQCTRL and AU_OLDGETQCTRL and a 64-bit 133 * userland. 134 */ 135 struct au_qctrl64 { 136 u_int64_t aq64_hiwater; 137 u_int64_t aq64_lowater; 138 u_int64_t aq64_bufsz; 139 u_int64_t aq64_delay; 140 u_int64_t aq64_minfree; 141 }; 142 typedef struct au_qctrl64 au_qctrl64_t; 143 144 union auditon_udata { 145 char *au_path; 146 int au_cond; 147 int au_flags; 148 int au_policy; 149 int au_trigger; 150 int64_t au_cond64; 151 int64_t au_policy64; 152 au_evclass_map_t au_evclass; 153 au_mask_t au_mask; 154 auditinfo_t au_auinfo; 155 auditpinfo_t au_aupinfo; 156 auditpinfo_addr_t au_aupinfo_addr; 157 au_qctrl_t au_qctrl; 158 au_qctrl64_t au_qctrl64; 159 au_stat_t au_stat; 160 au_fstat_t au_fstat; 161 auditinfo_addr_t au_kau_info; 162 au_evname_map_t au_evname; 163 }; 164 165 struct posix_ipc_perm { 166 uid_t pipc_uid; 167 gid_t pipc_gid; 168 mode_t pipc_mode; 169 }; 170 171 struct audit_record { 172 /* Audit record header. */ 173 u_int32_t ar_magic; 174 int ar_event; 175 int ar_retval; /* value returned to the process */ 176 int ar_errno; /* return status of system call */ 177 struct timespec ar_starttime; 178 struct timespec ar_endtime; 179 u_int64_t ar_valid_arg; /* Bitmask of valid arguments */ 180 181 /* Audit subject information. */ 182 struct xucred ar_subj_cred; 183 uid_t ar_subj_ruid; 184 gid_t ar_subj_rgid; 185 gid_t ar_subj_egid; 186 uid_t ar_subj_auid; /* Audit user ID */ 187 pid_t ar_subj_asid; /* Audit session ID */ 188 pid_t ar_subj_pid; 189 struct au_tid ar_subj_term; 190 struct au_tid_addr ar_subj_term_addr; 191 struct au_mask ar_subj_amask; 192 193 /* Operation arguments. */ 194 uid_t ar_arg_euid; 195 uid_t ar_arg_ruid; 196 uid_t ar_arg_suid; 197 gid_t ar_arg_egid; 198 gid_t ar_arg_rgid; 199 gid_t ar_arg_sgid; 200 pid_t ar_arg_pid; 201 pid_t ar_arg_asid; 202 struct au_tid ar_arg_termid; 203 struct au_tid_addr ar_arg_termid_addr; 204 uid_t ar_arg_uid; 205 uid_t ar_arg_auid; 206 gid_t ar_arg_gid; 207 struct groupset ar_arg_groups; 208 int ar_arg_fd; 209 int ar_arg_atfd1; 210 int ar_arg_atfd2; 211 int ar_arg_fflags; 212 mode_t ar_arg_mode; 213 int ar_arg_dev; /* XXX dev_t compatibility */ 214 long ar_arg_value; 215 void *ar_arg_addr; 216 int ar_arg_len; 217 int ar_arg_mask; 218 u_int ar_arg_signum; 219 char ar_arg_login[MAXLOGNAME]; 220 int ar_arg_ctlname[CTL_MAXNAME]; 221 struct socket_au_info ar_arg_sockinfo; 222 char *ar_arg_upath1; 223 char *ar_arg_upath2; 224 char *ar_arg_text; 225 struct au_mask ar_arg_amask; 226 struct vnode_au_info ar_arg_vnode1; 227 struct vnode_au_info ar_arg_vnode2; 228 int ar_arg_cmd; 229 int ar_arg_svipc_which; 230 int ar_arg_svipc_cmd; 231 struct ipc_perm ar_arg_svipc_perm; 232 int ar_arg_svipc_id; 233 void *ar_arg_svipc_addr; 234 struct posix_ipc_perm ar_arg_pipc_perm; 235 union auditon_udata ar_arg_auditon; 236 char *ar_arg_argv; 237 int ar_arg_argc; 238 char *ar_arg_envv; 239 int ar_arg_envc; 240 int ar_arg_exitstatus; 241 int ar_arg_exitretval; 242 struct sockaddr_storage ar_arg_sockaddr; 243 cap_rights_t ar_arg_rights; 244 uint32_t ar_arg_fcntl_rights; 245 char ar_jailname[MAXHOSTNAMELEN]; 246 }; 247 248 /* 249 * Arguments in the audit record are initially not defined; flags are set to 250 * indicate if they are present so they can be included in the audit log 251 * stream only if defined. 252 */ 253 #define ARG_EUID 0x0000000000000001ULL 254 #define ARG_RUID 0x0000000000000002ULL 255 #define ARG_SUID 0x0000000000000004ULL 256 #define ARG_EGID 0x0000000000000008ULL 257 #define ARG_RGID 0x0000000000000010ULL 258 #define ARG_SGID 0x0000000000000020ULL 259 #define ARG_PID 0x0000000000000040ULL 260 #define ARG_UID 0x0000000000000080ULL 261 #define ARG_AUID 0x0000000000000100ULL 262 #define ARG_GID 0x0000000000000200ULL 263 #define ARG_FD 0x0000000000000400ULL 264 #define ARG_POSIX_IPC_PERM 0x0000000000000800ULL 265 #define ARG_FFLAGS 0x0000000000001000ULL 266 #define ARG_MODE 0x0000000000002000ULL 267 #define ARG_DEV 0x0000000000004000ULL 268 #define ARG_ADDR 0x0000000000008000ULL 269 #define ARG_LEN 0x0000000000010000ULL 270 #define ARG_MASK 0x0000000000020000ULL 271 #define ARG_SIGNUM 0x0000000000040000ULL 272 #define ARG_LOGIN 0x0000000000080000ULL 273 #define ARG_SADDRINET 0x0000000000100000ULL 274 #define ARG_SADDRINET6 0x0000000000200000ULL 275 #define ARG_SADDRUNIX 0x0000000000400000ULL 276 #define ARG_TERMID_ADDR 0x0000000000800000ULL 277 #define ARG_UNUSED2 0x0000000001000000ULL 278 #define ARG_UPATH1 0x0000000002000000ULL 279 #define ARG_UPATH2 0x0000000004000000ULL 280 #define ARG_TEXT 0x0000000008000000ULL 281 #define ARG_VNODE1 0x0000000010000000ULL 282 #define ARG_VNODE2 0x0000000020000000ULL 283 #define ARG_SVIPC_CMD 0x0000000040000000ULL 284 #define ARG_SVIPC_PERM 0x0000000080000000ULL 285 #define ARG_SVIPC_ID 0x0000000100000000ULL 286 #define ARG_SVIPC_ADDR 0x0000000200000000ULL 287 #define ARG_GROUPSET 0x0000000400000000ULL 288 #define ARG_CMD 0x0000000800000000ULL 289 #define ARG_SOCKINFO 0x0000001000000000ULL 290 #define ARG_ASID 0x0000002000000000ULL 291 #define ARG_TERMID 0x0000004000000000ULL 292 #define ARG_AUDITON 0x0000008000000000ULL 293 #define ARG_VALUE 0x0000010000000000ULL 294 #define ARG_AMASK 0x0000020000000000ULL 295 #define ARG_CTLNAME 0x0000040000000000ULL 296 #define ARG_PROCESS 0x0000080000000000ULL 297 #define ARG_MACHPORT1 0x0000100000000000ULL 298 #define ARG_MACHPORT2 0x0000200000000000ULL 299 #define ARG_EXIT 0x0000400000000000ULL 300 #define ARG_IOVECSTR 0x0000800000000000ULL 301 #define ARG_ARGV 0x0001000000000000ULL 302 #define ARG_ENVV 0x0002000000000000ULL 303 #define ARG_ATFD1 0x0004000000000000ULL 304 #define ARG_ATFD2 0x0008000000000000ULL 305 #define ARG_RIGHTS 0x0010000000000000ULL 306 #define ARG_FCNTL_RIGHTS 0x0020000000000000ULL 307 #define ARG_SVIPC_WHICH 0x0200000000000000ULL 308 #define ARG_NONE 0x0000000000000000ULL 309 #define ARG_ALL 0xFFFFFFFFFFFFFFFFULL 310 311 #define ARG_IS_VALID(kar, arg) ((kar)->k_ar.ar_valid_arg & (arg)) 312 #define ARG_SET_VALID(kar, arg) do { \ 313 (kar)->k_ar.ar_valid_arg |= (arg); \ 314 } while (0) 315 #define ARG_CLEAR_VALID(kar, arg) do { \ 316 (kar)->k_ar.ar_valid_arg &= ~(arg); \ 317 } while (0) 318 319 /* 320 * In-kernel version of audit record; the basic record plus queue meta-data. 321 * This record can also have a pointer set to some opaque data that will be 322 * passed through to the audit writing mechanism. 323 */ 324 struct kaudit_record { 325 struct audit_record k_ar; 326 u_int32_t k_ar_commit; 327 void *k_udata; /* User data. */ 328 u_int k_ulen; /* User data length. */ 329 struct uthread *k_uthread; /* Audited thread. */ 330 void *k_dtaudit_state; 331 TAILQ_ENTRY(kaudit_record) k_q; 332 }; 333 TAILQ_HEAD(kaudit_queue, kaudit_record); 334 335 /* 336 * Functions to manage the allocation, release, and commit of kernel audit 337 * records. 338 */ 339 void audit_abort(struct kaudit_record *ar); 340 void audit_commit(struct kaudit_record *ar, int error, 341 int retval); 342 struct kaudit_record *audit_new(int event, struct thread *td); 343 344 /* 345 * Function to update the audit_syscalls_enabled flag, whose value is affected 346 * by configuration of the audit trail/pipe mechanism and DTrace. Call this 347 * function when any of the inputs to that policy change. 348 */ 349 void audit_syscalls_enabled_update(void); 350 351 /* 352 * Functions relating to the conversion of internal kernel audit records to 353 * the BSM file format. 354 */ 355 struct au_record; 356 int kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau); 357 int bsm_rec_verify(void *rec); 358 359 /* 360 * Kernel versions of the libbsm audit record functions. 361 */ 362 void kau_free(struct au_record *rec); 363 void kau_init(void); 364 365 /* 366 * Return values for pre-selection and post-selection decisions. 367 */ 368 #define AU_PRS_SUCCESS 1 369 #define AU_PRS_FAILURE 2 370 #define AU_PRS_BOTH (AU_PRS_SUCCESS|AU_PRS_FAILURE) 371 372 /* 373 * Data structures relating to the kernel audit queue. Ideally, these might 374 * be abstracted so that only accessor methods are exposed. 375 */ 376 extern struct mtx audit_mtx; 377 extern struct cv audit_watermark_cv; 378 extern struct cv audit_worker_cv; 379 extern struct kaudit_queue audit_q; 380 extern int audit_q_len; 381 extern int audit_pre_q_len; 382 extern int audit_in_failure; 383 384 /* 385 * Flags to use on audit files when opening and closing. 386 */ 387 #define AUDIT_OPEN_FLAGS (FWRITE | O_APPEND) 388 #define AUDIT_CLOSE_FLAGS (FWRITE | O_APPEND) 389 390 /* 391 * Audit event-to-name mapping structure, maintained in audit_bsm_klib.c. It 392 * appears in this header so that the DTrace audit provider can dereference 393 * instances passed back in the au_evname_foreach() callbacks. Safe access to 394 * its fields requires holding ene_lock (after it is visible in the global 395 * table). 396 * 397 * Locking: 398 * (c) - Constant after inserted in the global table 399 * (l) - Protected by ene_lock 400 * (m) - Protected by evnamemap_lock (audit_bsm_klib.c) 401 * (M) - Writes protected by evnamemap_lock; reads unprotected. 402 */ 403 struct evname_elem { 404 au_event_t ene_event; /* (c) */ 405 char ene_name[EVNAMEMAP_NAME_SIZE]; /* (l) */ 406 LIST_ENTRY(evname_elem) ene_entry; /* (m) */ 407 struct mtx ene_lock; 408 409 /* DTrace probe IDs; 0 if not yet registered. */ 410 uint32_t ene_commit_probe_id; /* (M) */ 411 uint32_t ene_bsm_probe_id; /* (M) */ 412 413 /* Flags indicating if the probes enabled or not. */ 414 int ene_commit_probe_enabled; /* (M) */ 415 int ene_bsm_probe_enabled; /* (M) */ 416 }; 417 418 #define EVNAME_LOCK(ene) mtx_lock(&(ene)->ene_lock) 419 #define EVNAME_UNLOCK(ene) mtx_unlock(&(ene)->ene_lock) 420 421 /* 422 * Callback function typedef for the same. 423 */ 424 typedef void (*au_evnamemap_callback_t)(struct evname_elem *ene); 425 426 /* 427 * DTrace audit provider (dtaudit) hooks -- to be set non-NULL when the audit 428 * provider is loaded and ready to be called into. 429 */ 430 extern void *(*dtaudit_hook_preselect)(au_id_t auid, au_event_t event, 431 au_class_t class); 432 extern int (*dtaudit_hook_commit)(struct kaudit_record *kar, 433 au_id_t auid, au_event_t event, au_class_t class, 434 int sorf); 435 extern void (*dtaudit_hook_bsm)(struct kaudit_record *kar, au_id_t auid, 436 au_event_t event, au_class_t class, int sorf, 437 void *bsm_data, size_t bsm_len); 438 439 #include <sys/fcntl.h> 440 #include <sys/kernel.h> 441 #include <sys/malloc.h> 442 443 /* 444 * Some of the BSM tokenizer functions take different parameters in the 445 * kernel implementations in order to save the copying of large kernel data 446 * structures. The prototypes of these functions are declared here. 447 */ 448 token_t *kau_to_socket(struct socket_au_info *soi); 449 450 /* 451 * audit_klib prototypes 452 */ 453 int au_preselect(au_event_t event, au_class_t class, 454 au_mask_t *mask_p, int sorf); 455 void au_evclassmap_init(void); 456 void au_evclassmap_insert(au_event_t event, au_class_t class); 457 au_class_t au_event_class(au_event_t event); 458 void au_evnamemap_init(void); 459 void au_evnamemap_insert(au_event_t event, const char *name); 460 void au_evnamemap_foreach(au_evnamemap_callback_t callback); 461 struct evname_elem *au_evnamemap_lookup(au_event_t event); 462 int au_event_name(au_event_t event, char *name); 463 au_event_t audit_ctlname_to_sysctlevent(int name[], uint64_t valid_arg); 464 au_event_t audit_flags_and_error_to_openevent(int oflags, int error); 465 au_event_t audit_flags_and_error_to_openatevent(int oflags, int error); 466 au_event_t audit_msgctl_to_event(int cmd); 467 au_event_t audit_msgsys_to_event(int which); 468 au_event_t audit_semctl_to_event(int cmd); 469 au_event_t audit_semsys_to_event(int which); 470 au_event_t audit_shmsys_to_event(int which); 471 void audit_canon_path(struct thread *td, int dirfd, char *path, 472 char *cpath); 473 void audit_canon_path_vp(struct thread *td, struct vnode *rdir, 474 struct vnode *cdir, char *path, char *cpath); 475 au_event_t auditon_command_event(int cmd); 476 477 /* 478 * Audit trigger events notify user space of kernel audit conditions 479 * asynchronously. 480 */ 481 void audit_trigger_init(void); 482 int audit_send_trigger(unsigned int trigger); 483 484 /* 485 * Accessor functions to manage global audit state. 486 */ 487 void audit_set_kinfo(struct auditinfo_addr *); 488 void audit_get_kinfo(struct auditinfo_addr *); 489 490 /* 491 * General audit related functions. 492 */ 493 struct kaudit_record *currecord(void); 494 void audit_free(struct kaudit_record *ar); 495 void audit_shutdown(void *arg, int howto); 496 void audit_rotate_vnode(struct ucred *cred, 497 struct vnode *vp); 498 void audit_worker_init(void); 499 500 /* 501 * Audit pipe functions. 502 */ 503 int audit_pipe_preselect(au_id_t auid, au_event_t event, 504 au_class_t class, int sorf, int trail_select); 505 void audit_pipe_submit(au_id_t auid, au_event_t event, au_class_t class, 506 int sorf, int trail_select, void *record, u_int record_len); 507 void audit_pipe_submit_user(void *record, u_int record_len); 508 509 #endif /* ! _SECURITY_AUDIT_PRIVATE_H_ */ 510