1 /* 2 * Copyright (c) 1999-2005 Apple Computer, 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 Computer, 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 * The AUDIT_EXCESSIVELY_VERBOSE define enables a number of gratuitously 57 * noisy printf's to the console. Due to the volume, it should be left off 58 * unless you want your system to churn a lot whenever the audit record flow 59 * gets high. 60 */ 61 //#define AUDIT_EXCESSIVELY_VERBOSE 62 #ifdef AUDIT_EXCESSIVELY_VERBOSE 63 #define AUDIT_PRINTF(x) printf x 64 #else 65 #define AUDIT_PRINTF(x) 66 #endif 67 68 /* 69 * Audit control variables that are usually set/read via system calls and 70 * used to control various aspects of auditing. 71 */ 72 extern struct au_qctrl audit_qctrl; 73 extern struct audit_fstat audit_fstat; 74 extern struct au_mask audit_nae_mask; 75 extern int audit_panic_on_write_fail; 76 extern int audit_fail_stop; 77 extern int audit_argv; 78 extern int audit_arge; 79 80 /* 81 * Success/failure conditions for the conversion of a kernel audit record to 82 * BSM format. 83 */ 84 #define BSM_SUCCESS 0 85 #define BSM_FAILURE 1 86 #define BSM_NOAUDIT 2 87 88 /* 89 * Defines for the kernel audit record k_ar_commit field. Flags are set to 90 * indicate what sort of record it is, and which preselection mechanism 91 * selected it. 92 */ 93 #define AR_COMMIT_KERNEL 0x00000001U 94 #define AR_COMMIT_USER 0x00000010U 95 96 #define AR_PRESELECT_TRAIL 0x00001000U 97 #define AR_PRESELECT_PIPE 0x00002000U 98 99 #define AR_PRESELECT_USER_TRAIL 0x00004000U 100 #define AR_PRESELECT_USER_PIPE 0x00008000U 101 102 /* 103 * Audit data is generated as a stream of struct audit_record structures, 104 * linked by struct kaudit_record, and contain storage for possible audit so 105 * that it will not need to be allocated during the processing of a system 106 * call, both improving efficiency and avoiding sleeping at untimely moments. 107 * This structure is converted to BSM format before being written to disk. 108 */ 109 struct vnode_au_info { 110 mode_t vn_mode; 111 uid_t vn_uid; 112 gid_t vn_gid; 113 dev_t vn_dev; 114 long vn_fsid; 115 long vn_fileid; 116 long vn_gen; 117 }; 118 119 struct groupset { 120 gid_t gidset[NGROUPS]; 121 u_int gidset_size; 122 }; 123 124 struct socket_au_info { 125 int so_domain; 126 int so_type; 127 int so_protocol; 128 in_addr_t so_raddr; /* Remote address if INET socket. */ 129 in_addr_t so_laddr; /* Local address if INET socket. */ 130 u_short so_rport; /* Remote port. */ 131 u_short so_lport; /* Local port. */ 132 }; 133 134 union auditon_udata { 135 char *au_path; 136 long au_cond; 137 long au_flags; 138 long au_policy; 139 int au_trigger; 140 au_evclass_map_t au_evclass; 141 au_mask_t au_mask; 142 auditinfo_t au_auinfo; 143 auditpinfo_t au_aupinfo; 144 auditpinfo_addr_t au_aupinfo_addr; 145 au_qctrl_t au_qctrl; 146 au_stat_t au_stat; 147 au_fstat_t au_fstat; 148 }; 149 150 struct posix_ipc_perm { 151 uid_t pipc_uid; 152 gid_t pipc_gid; 153 mode_t pipc_mode; 154 }; 155 156 struct audit_record { 157 /* Audit record header. */ 158 u_int32_t ar_magic; 159 int ar_event; 160 int ar_retval; /* value returned to the process */ 161 int ar_errno; /* return status of system call */ 162 struct timespec ar_starttime; 163 struct timespec ar_endtime; 164 u_int64_t ar_valid_arg; /* Bitmask of valid arguments */ 165 166 /* Audit subject information. */ 167 struct xucred ar_subj_cred; 168 uid_t ar_subj_ruid; 169 gid_t ar_subj_rgid; 170 gid_t ar_subj_egid; 171 uid_t ar_subj_auid; /* Audit user ID */ 172 pid_t ar_subj_asid; /* Audit session ID */ 173 pid_t ar_subj_pid; 174 struct au_tid ar_subj_term; 175 struct au_tid_addr ar_subj_term_addr; 176 char ar_subj_comm[MAXCOMLEN + 1]; 177 struct au_mask ar_subj_amask; 178 179 /* Operation arguments. */ 180 uid_t ar_arg_euid; 181 uid_t ar_arg_ruid; 182 uid_t ar_arg_suid; 183 gid_t ar_arg_egid; 184 gid_t ar_arg_rgid; 185 gid_t ar_arg_sgid; 186 pid_t ar_arg_pid; 187 pid_t ar_arg_asid; 188 struct au_tid ar_arg_termid; 189 struct au_tid_addr ar_arg_termid_addr; 190 uid_t ar_arg_uid; 191 uid_t ar_arg_auid; 192 gid_t ar_arg_gid; 193 struct groupset ar_arg_groups; 194 int ar_arg_fd; 195 int ar_arg_fflags; 196 mode_t ar_arg_mode; 197 int ar_arg_dev; 198 long ar_arg_value; 199 void * ar_arg_addr; 200 int ar_arg_len; 201 int ar_arg_mask; 202 u_int ar_arg_signum; 203 char ar_arg_login[MAXLOGNAME]; 204 int ar_arg_ctlname[CTL_MAXNAME]; 205 struct socket_au_info ar_arg_sockinfo; 206 char *ar_arg_upath1; 207 char *ar_arg_upath2; 208 char *ar_arg_text; 209 struct au_mask ar_arg_amask; 210 struct vnode_au_info ar_arg_vnode1; 211 struct vnode_au_info ar_arg_vnode2; 212 int ar_arg_cmd; 213 int ar_arg_svipc_cmd; 214 struct ipc_perm ar_arg_svipc_perm; 215 int ar_arg_svipc_id; 216 void * ar_arg_svipc_addr; 217 struct posix_ipc_perm ar_arg_pipc_perm; 218 union auditon_udata ar_arg_auditon; 219 char *ar_arg_argv; 220 int ar_arg_argc; 221 char *ar_arg_envv; 222 int ar_arg_envc; 223 int ar_arg_exitstatus; 224 int ar_arg_exitretval; 225 struct sockaddr_storage ar_arg_sockaddr; 226 }; 227 228 /* 229 * Arguments in the audit record are initially not defined; flags are set to 230 * indicate if they are present so they can be included in the audit log 231 * stream only if defined. 232 */ 233 #define ARG_IS_VALID(kar, arg) ((kar)->k_ar.ar_valid_arg & (arg)) 234 #define ARG_SET_VALID(kar, arg) do { \ 235 (kar)->k_ar.ar_valid_arg |= (arg); \ 236 } while (0) 237 238 /* 239 * In-kernel version of audit record; the basic record plus queue meta-data. 240 * This record can also have a pointer set to some opaque data that will be 241 * passed through to the audit writing mechanism. 242 */ 243 struct kaudit_record { 244 struct audit_record k_ar; 245 u_int32_t k_ar_commit; 246 void *k_udata; /* User data. */ 247 u_int k_ulen; /* User data length. */ 248 struct uthread *k_uthread; /* Audited thread. */ 249 TAILQ_ENTRY(kaudit_record) k_q; 250 }; 251 TAILQ_HEAD(kaudit_queue, kaudit_record); 252 253 /* 254 * Functions to manage the allocation, release, and commit of kernel audit 255 * records. 256 */ 257 void audit_abort(struct kaudit_record *ar); 258 void audit_commit(struct kaudit_record *ar, int error, 259 int retval); 260 struct kaudit_record *audit_new(int event, struct thread *td); 261 262 /* 263 * Functions relating to the conversion of internal kernel audit records to 264 * the BSM file format. 265 */ 266 struct au_record; 267 int kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau); 268 int bsm_rec_verify(void *rec); 269 270 /* 271 * Kernel versions of the libbsm audit record functions. 272 */ 273 void kau_free(struct au_record *rec); 274 void kau_init(void); 275 276 /* 277 * Return values for pre-selection and post-selection decisions. 278 */ 279 #define AU_PRS_SUCCESS 1 280 #define AU_PRS_FAILURE 2 281 #define AU_PRS_BOTH (AU_PRS_SUCCESS|AU_PRS_FAILURE) 282 283 /* 284 * Data structures relating to the kernel audit queue. Ideally, these might 285 * be abstracted so that only accessor methods are exposed. 286 */ 287 extern struct mtx audit_mtx; 288 extern struct cv audit_watermark_cv; 289 extern struct cv audit_worker_cv; 290 extern struct kaudit_queue audit_q; 291 extern int audit_q_len; 292 extern int audit_pre_q_len; 293 extern int audit_in_failure; 294 295 /* 296 * Flags to use on audit files when opening and closing. 297 */ 298 #define AUDIT_OPEN_FLAGS (FWRITE | O_APPEND) 299 #define AUDIT_CLOSE_FLAGS (FWRITE | O_APPEND) 300 301 #include <sys/fcntl.h> 302 #include <sys/kernel.h> 303 #include <sys/malloc.h> 304 305 /* 306 * Some of the BSM tokenizer functions take different parameters in the 307 * kernel implementations in order to save the copying of large kernel data 308 * structures. The prototypes of these functions are declared here. 309 */ 310 token_t *kau_to_socket(struct socket_au_info *soi); 311 312 /* 313 * audit_klib prototypes 314 */ 315 int au_preselect(au_event_t event, au_class_t class, 316 au_mask_t *mask_p, int sorf); 317 au_event_t flags_and_error_to_openevent(int oflags, int error); 318 void au_evclassmap_init(void); 319 void au_evclassmap_insert(au_event_t event, au_class_t class); 320 au_class_t au_event_class(au_event_t event); 321 au_event_t ctlname_to_sysctlevent(int name[], uint64_t valid_arg); 322 int auditon_command_event(int cmd); 323 int msgctl_to_event(int cmd); 324 int semctl_to_event(int cmr); 325 void canon_path(struct thread *td, char *path, char *cpath); 326 327 /* 328 * Audit trigger events notify user space of kernel audit conditions 329 * asynchronously. 330 */ 331 void audit_trigger_init(void); 332 int send_trigger(unsigned int trigger); 333 334 /* 335 * General audit related functions. 336 */ 337 struct kaudit_record *currecord(void); 338 void audit_free(struct kaudit_record *ar); 339 void audit_shutdown(void *arg, int howto); 340 void audit_rotate_vnode(struct ucred *cred, 341 struct vnode *vp); 342 void audit_worker_init(void); 343 344 /* 345 * Audit pipe functions. 346 */ 347 int audit_pipe_preselect(au_id_t auid, au_event_t event, 348 au_class_t class, int sorf, int trail_select); 349 void audit_pipe_submit(au_id_t auid, au_event_t event, au_class_t class, 350 int sorf, int trail_select, void *record, u_int record_len); 351 void audit_pipe_submit_user(void *record, u_int record_len); 352 353 #endif /* ! _SECURITY_AUDIT_PRIVATE_H_ */ 354