1 /*- 2 * Copyright (c) 1999-2009 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 * $FreeBSD$ 30 */ 31 32 /* 33 * This include file contains function prototypes and type definitions used 34 * within the audit implementation. 35 */ 36 37 #ifndef _SECURITY_AUDIT_PRIVATE_H_ 38 #define _SECURITY_AUDIT_PRIVATE_H_ 39 40 #ifndef _KERNEL 41 #error "no user-serviceable parts inside" 42 #endif 43 44 #include <sys/ipc.h> 45 #include <sys/socket.h> 46 #include <sys/ucred.h> 47 48 #ifdef MALLOC_DECLARE 49 MALLOC_DECLARE(M_AUDITBSM); 50 MALLOC_DECLARE(M_AUDITDATA); 51 MALLOC_DECLARE(M_AUDITPATH); 52 MALLOC_DECLARE(M_AUDITTEXT); 53 #endif 54 55 /* 56 * Audit control variables that are usually set/read via system calls and 57 * used to control various aspects of auditing. 58 */ 59 extern struct au_qctrl audit_qctrl; 60 extern struct audit_fstat audit_fstat; 61 extern struct au_mask audit_nae_mask; 62 extern int audit_panic_on_write_fail; 63 extern int audit_fail_stop; 64 extern int audit_argv; 65 extern int audit_arge; 66 67 /* 68 * Success/failure conditions for the conversion of a kernel audit record to 69 * BSM format. 70 */ 71 #define BSM_SUCCESS 0 72 #define BSM_FAILURE 1 73 #define BSM_NOAUDIT 2 74 75 /* 76 * Defines for the kernel audit record k_ar_commit field. Flags are set to 77 * indicate what sort of record it is, and which preselection mechanism 78 * selected it. 79 */ 80 #define AR_COMMIT_KERNEL 0x00000001U 81 #define AR_COMMIT_USER 0x00000010U 82 83 #define AR_PRESELECT_TRAIL 0x00001000U 84 #define AR_PRESELECT_PIPE 0x00002000U 85 86 #define AR_PRESELECT_USER_TRAIL 0x00004000U 87 #define AR_PRESELECT_USER_PIPE 0x00008000U 88 89 /* 90 * Audit data is generated as a stream of struct audit_record structures, 91 * linked by struct kaudit_record, and contain storage for possible audit so 92 * that it will not need to be allocated during the processing of a system 93 * call, both improving efficiency and avoiding sleeping at untimely moments. 94 * This structure is converted to BSM format before being written to disk. 95 */ 96 struct vnode_au_info { 97 mode_t vn_mode; 98 uid_t vn_uid; 99 gid_t vn_gid; 100 dev_t vn_dev; 101 long vn_fsid; 102 long vn_fileid; 103 long vn_gen; 104 }; 105 106 struct groupset { 107 gid_t gidset[NGROUPS]; 108 u_int gidset_size; 109 }; 110 111 struct socket_au_info { 112 int so_domain; 113 int so_type; 114 int so_protocol; 115 in_addr_t so_raddr; /* Remote address if INET socket. */ 116 in_addr_t so_laddr; /* Local address if INET socket. */ 117 u_short so_rport; /* Remote port. */ 118 u_short so_lport; /* Local port. */ 119 }; 120 121 union auditon_udata { 122 char *au_path; 123 long au_cond; 124 long au_flags; 125 long au_policy; 126 int au_trigger; 127 au_evclass_map_t au_evclass; 128 au_mask_t au_mask; 129 auditinfo_t au_auinfo; 130 auditpinfo_t au_aupinfo; 131 auditpinfo_addr_t au_aupinfo_addr; 132 au_qctrl_t au_qctrl; 133 au_stat_t au_stat; 134 au_fstat_t au_fstat; 135 auditinfo_addr_t au_kau_info; 136 }; 137 138 struct posix_ipc_perm { 139 uid_t pipc_uid; 140 gid_t pipc_gid; 141 mode_t pipc_mode; 142 }; 143 144 struct audit_record { 145 /* Audit record header. */ 146 u_int32_t ar_magic; 147 int ar_event; 148 int ar_retval; /* value returned to the process */ 149 int ar_errno; /* return status of system call */ 150 struct timespec ar_starttime; 151 struct timespec ar_endtime; 152 u_int64_t ar_valid_arg; /* Bitmask of valid arguments */ 153 154 /* Audit subject information. */ 155 struct xucred ar_subj_cred; 156 uid_t ar_subj_ruid; 157 gid_t ar_subj_rgid; 158 gid_t ar_subj_egid; 159 uid_t ar_subj_auid; /* Audit user ID */ 160 pid_t ar_subj_asid; /* Audit session ID */ 161 pid_t ar_subj_pid; 162 struct au_tid ar_subj_term; 163 struct au_tid_addr ar_subj_term_addr; 164 struct au_mask ar_subj_amask; 165 166 /* Operation arguments. */ 167 uid_t ar_arg_euid; 168 uid_t ar_arg_ruid; 169 uid_t ar_arg_suid; 170 gid_t ar_arg_egid; 171 gid_t ar_arg_rgid; 172 gid_t ar_arg_sgid; 173 pid_t ar_arg_pid; 174 pid_t ar_arg_asid; 175 struct au_tid ar_arg_termid; 176 struct au_tid_addr ar_arg_termid_addr; 177 uid_t ar_arg_uid; 178 uid_t ar_arg_auid; 179 gid_t ar_arg_gid; 180 struct groupset ar_arg_groups; 181 int ar_arg_fd; 182 int ar_arg_fflags; 183 mode_t ar_arg_mode; 184 int ar_arg_dev; 185 long ar_arg_value; 186 void * ar_arg_addr; 187 int ar_arg_len; 188 int ar_arg_mask; 189 u_int ar_arg_signum; 190 char ar_arg_login[MAXLOGNAME]; 191 int ar_arg_ctlname[CTL_MAXNAME]; 192 struct socket_au_info ar_arg_sockinfo; 193 char *ar_arg_upath1; 194 char *ar_arg_upath2; 195 char *ar_arg_text; 196 struct au_mask ar_arg_amask; 197 struct vnode_au_info ar_arg_vnode1; 198 struct vnode_au_info ar_arg_vnode2; 199 int ar_arg_cmd; 200 int ar_arg_svipc_cmd; 201 struct ipc_perm ar_arg_svipc_perm; 202 int ar_arg_svipc_id; 203 void * ar_arg_svipc_addr; 204 struct posix_ipc_perm ar_arg_pipc_perm; 205 union auditon_udata ar_arg_auditon; 206 char *ar_arg_argv; 207 int ar_arg_argc; 208 char *ar_arg_envv; 209 int ar_arg_envc; 210 int ar_arg_exitstatus; 211 int ar_arg_exitretval; 212 struct sockaddr_storage ar_arg_sockaddr; 213 }; 214 215 /* 216 * Arguments in the audit record are initially not defined; flags are set to 217 * indicate if they are present so they can be included in the audit log 218 * stream only if defined. 219 */ 220 #define ARG_IS_VALID(kar, arg) ((kar)->k_ar.ar_valid_arg & (arg)) 221 #define ARG_SET_VALID(kar, arg) do { \ 222 (kar)->k_ar.ar_valid_arg |= (arg); \ 223 } while (0) 224 225 /* 226 * In-kernel version of audit record; the basic record plus queue meta-data. 227 * This record can also have a pointer set to some opaque data that will be 228 * passed through to the audit writing mechanism. 229 */ 230 struct kaudit_record { 231 struct audit_record k_ar; 232 u_int32_t k_ar_commit; 233 void *k_udata; /* User data. */ 234 u_int k_ulen; /* User data length. */ 235 struct uthread *k_uthread; /* Audited thread. */ 236 TAILQ_ENTRY(kaudit_record) k_q; 237 }; 238 TAILQ_HEAD(kaudit_queue, kaudit_record); 239 240 /* 241 * Functions to manage the allocation, release, and commit of kernel audit 242 * records. 243 */ 244 void audit_abort(struct kaudit_record *ar); 245 void audit_commit(struct kaudit_record *ar, int error, 246 int retval); 247 struct kaudit_record *audit_new(int event, struct thread *td); 248 249 /* 250 * Functions relating to the conversion of internal kernel audit records to 251 * the BSM file format. 252 */ 253 struct au_record; 254 int kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau); 255 int bsm_rec_verify(void *rec); 256 257 /* 258 * Kernel versions of the libbsm audit record functions. 259 */ 260 void kau_free(struct au_record *rec); 261 void kau_init(void); 262 263 /* 264 * Return values for pre-selection and post-selection decisions. 265 */ 266 #define AU_PRS_SUCCESS 1 267 #define AU_PRS_FAILURE 2 268 #define AU_PRS_BOTH (AU_PRS_SUCCESS|AU_PRS_FAILURE) 269 270 /* 271 * Data structures relating to the kernel audit queue. Ideally, these might 272 * be abstracted so that only accessor methods are exposed. 273 */ 274 extern struct mtx audit_mtx; 275 extern struct cv audit_watermark_cv; 276 extern struct cv audit_worker_cv; 277 extern struct kaudit_queue audit_q; 278 extern size_t audit_q_len; 279 extern size_t audit_pre_q_len; 280 extern int audit_in_failure; 281 282 /* 283 * Flags to use on audit files when opening and closing. 284 */ 285 #define AUDIT_OPEN_FLAGS (FWRITE | O_APPEND) 286 #define AUDIT_CLOSE_FLAGS (FWRITE | O_APPEND) 287 288 #include <sys/fcntl.h> 289 #include <sys/kernel.h> 290 #include <sys/malloc.h> 291 292 /* 293 * Some of the BSM tokenizer functions take different parameters in the 294 * kernel implementations in order to save the copying of large kernel data 295 * structures. The prototypes of these functions are declared here. 296 */ 297 token_t *kau_to_socket(struct socket_au_info *soi); 298 299 /* 300 * audit_klib prototypes 301 */ 302 int au_preselect(au_event_t event, au_class_t class, 303 au_mask_t *mask_p, int sorf); 304 void au_evclassmap_init(void); 305 void au_evclassmap_insert(au_event_t event, au_class_t class); 306 au_class_t au_event_class(au_event_t event); 307 au_event_t audit_ctlname_to_sysctlevent(int name[], uint64_t valid_arg); 308 au_event_t audit_flags_and_error_to_openevent(int oflags, int error); 309 au_event_t audit_msgctl_to_event(int cmd); 310 au_event_t audit_semctl_to_event(int cmr); 311 void audit_canon_path(struct thread *td, char *path, char *cpath); 312 au_event_t auditon_command_event(int cmd); 313 314 /* 315 * Audit trigger events notify user space of kernel audit conditions 316 * asynchronously. 317 */ 318 void audit_trigger_init(void); 319 int audit_send_trigger(unsigned int trigger); 320 321 /* 322 * Accessor functions to manage global audit state. 323 */ 324 void audit_set_kinfo(struct auditinfo_addr *); 325 void audit_get_kinfo(struct auditinfo_addr *); 326 327 /* 328 * General audit related functions. 329 */ 330 struct kaudit_record *currecord(void); 331 void audit_free(struct kaudit_record *ar); 332 void audit_shutdown(void *arg, int howto); 333 void audit_rotate_vnode(struct ucred *cred, 334 struct vnode *vp); 335 void audit_worker_init(void); 336 337 /* 338 * Audit pipe functions. 339 */ 340 int audit_pipe_preselect(au_id_t auid, au_event_t event, 341 au_class_t class, int sorf, int trail_select); 342 void audit_pipe_submit(au_id_t auid, au_event_t event, au_class_t class, 343 int sorf, int trail_select, void *record, u_int record_len); 344 void audit_pipe_submit_user(void *record, u_int record_len); 345 346 #endif /* ! _SECURITY_AUDIT_PRIVATE_H_ */ 347