bsd/security/audit/audit.h

   1 /*-
   2  * Copyright (c) 2004-2016 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  */
  30 /*
  31  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  32  * support for mandatory and extensible security protections.  This notice
  33  * is included in support of clause 2.2 (b) of the Apple Public License,
  34  * Version 2.0.
  35  */
  36
  37 /*
  38  * This header includes function prototypes and type definitions that are
  39  * necessary for the kernel as a whole to interact with the audit subsystem.
  40  */
  41
  42 #ifndef _SECURITY_AUDIT_AUDIT_H
  43 #define _SECURITY_AUDIT_AUDIT_H
  44
  45 #if defined(_KERNEL) || defined(KERNEL)
  46
  47 #include <bsm/audit.h>
  48
  49 #include <sys/sysctl.h>
  50 #include <sys/user.h>
  51 #include <sys/ipc.h>
  52
  53 /*
  54  * Audit subsystem condition flags.  The audit_enabled flag is set and
  55  * removed automatically as a result of configuring log files, and can be
  56  * observed but should not be directly manipulated.  The audit suspension
  57  * flag permits audit to be temporarily disabled without reconfiguring the
  58  * audit target. The audit syscalls flag is set at the first hint that kernel
  59  * events (system and mach calls) need to be audited.  It is used for
  60  * performance so an event class map table lookup doesn't have be done for
  61  * every system call if only user events are being audited.
  62  */
  63 extern int      audit_enabled;
  64 extern int      audit_suspended;
  65 extern int      audit_syscalls;
  66
  67 /*
  68  * Define the masks for the audited arguments.
  69  *
  70  * XXXRW: These need to remain in audit.h for now because our vnode and name
  71  * lookup audit calls rely on passing in flags to indicate which name or
  72  * vnode is being logged.  These should move to audit_private.h when that is
  73  * fixed.
  74  */
  75 #define ARG_EUID                0x0000000000000001ULL
  76 #define ARG_RUID                0x0000000000000002ULL
  77 #define ARG_SUID                0x0000000000000004ULL
  78 #define ARG_EGID                0x0000000000000008ULL
  79 #define ARG_RGID                0x0000000000000010ULL
  80 #define ARG_SGID                0x0000000000000020ULL
  81 #define ARG_PID                 0x0000000000000040ULL
  82 #define ARG_UID                 0x0000000000000080ULL
  83 #define ARG_AUID                0x0000000000000100ULL
  84 #define ARG_GID                 0x0000000000000200ULL
  85 #define ARG_FD                  0x0000000000000400ULL
  86 #define ARG_FD1                 ARG_FD
  87 #define ARG_POSIX_IPC_PERM      0x0000000000000800ULL
  88 #define ARG_FFLAGS              0x0000000000001000ULL
  89 #define ARG_MODE                0x0000000000002000ULL
  90 #define ARG_VALUE32             0x0000000000004000ULL
  91 #define ARG_ADDR32              0x0000000000008000ULL
  92 #define ARG_ADDR                ARG_ADDR32
  93 #define ARG_LEN                 0x0000000000010000ULL
  94 #define ARG_MASK                0x0000000000020000ULL
  95 #define ARG_SIGNUM              0x0000000000040000ULL
  96 #define ARG_LOGIN               0x0000000000080000ULL
  97 #define ARG_SADDRINET           0x0000000000100000ULL
  98 #define ARG_SADDRINET6          0x0000000000200000ULL
  99 #define ARG_SADDRUNIX           0x0000000000400000ULL
 100 #define ARG_TERMID_ADDR         ARG_SADDRUNIX
 101 #define ARG_KPATH1              0x0000000000800000ULL   /* darwin-only */
 102 #define ARG_KPATH2              0x0000000001000000ULL   /* darwin-only */
 103 #define ARG_UPATH1              0x0000000002000000ULL
 104 #define ARG_UPATH2              0x0000000004000000ULL
 105 #define ARG_TEXT                0x0000000008000000ULL
 106 #define ARG_VNODE1              0x0000000010000000ULL
 107 #define ARG_VNODE2              0x0000000020000000ULL
 108 #define ARG_SVIPC_CMD           0x0000000040000000ULL
 109 #define ARG_SVIPC_PERM          0x0000000080000000ULL
 110 #define ARG_SVIPC_ID            0x0000000100000000ULL
 111 #define ARG_SVIPC_ADDR          0x0000000200000000ULL
 112 #define ARG_GROUPSET            0x0000000400000000ULL
 113 #define ARG_CMD                 0x0000000800000000ULL
 114 #define ARG_SOCKINFO            0x0000001000000000ULL
 115 #define ARG_ASID                0x0000002000000000ULL
 116 #define ARG_TERMID              0x0000004000000000ULL
 117 #define ARG_AUDITON             0x0000008000000000ULL
 118 #define ARG_VALUE64             0x0000010000000000ULL   /* darwin-only */
 119 #define ARG_AMASK               0x0000020000000000ULL
 120 #define ARG_CTLNAME             0x0000040000000000ULL
 121 #define ARG_PROCESS             0x0000080000000000ULL
 122 #define ARG_MACHPORT1           0x0000100000000000ULL
 123 #define ARG_MACHPORT2           0x0000200000000000ULL
 124 #define ARG_MAC_STRING          0x0000400000000000ULL
 125 #define ARG_EXIT                0x0000800000000000ULL
 126 #define ARG_IOVECSTR            0x0001000000000000ULL
 127 #define ARG_ARGV                0x0002000000000000ULL
 128 #define ARG_ENVV                0x0004000000000000ULL
 129 #define ARG_OPAQUE              0x0008000000000000ULL   /* darwin-only */
 130 #define ARG_DATA                0x0010000000000000ULL   /* darwin-only */
 131 #define ARG_ADDR64              0x0020000000000000ULL   /* darwin-only */
 132 #define ARG_FD2                 0x0040000000000000ULL   /* darwin-only */
 133 #define ARG_IDENTITY            0x0080000000000000ULL   /* darwin-only */
 134 #define ARG_NONE                0x0000000000000000ULL
 135 #define ARG_ALL                 0xFFFFFFFFFFFFFFFFULL
 136
 137 #if CONFIG_MACF
 138
 139 #define MAC_AUDIT_LABEL_LEN 1024
 140 #define MAC_AUDIT_DATA_TYPE 0
 141 #define MAC_AUDIT_TEXT_TYPE 1
 142
 143 struct mac_audit_record {
 144         int type;               /* one of the types defined above */
 145         int length;             /* byte length of the data field */
 146         u_char *data;           /* the payload */
 147         LIST_ENTRY(mac_audit_record) records;
 148 };
 149
 150 #endif
 151
 152 struct proc;
 153 struct vnode;
 154 struct componentname;
 155
 156 int                      kau_will_audit(void);
 157 void                     audit_init(void);
 158 void                     audit_shutdown(void);
 159 void                     audit_syscall_enter(unsigned int code,
 160                                 struct proc *proc, struct uthread *uthread);
 161 #if CONFIG_MACF
 162 /*
 163  * The parameter list of audit_syscall_exit() was modified to also take the
 164  * Darwin syscall number, which is required by mac_audit_check_postselect().
 165  */
 166 void    audit_syscall_exit(unsigned int code, int error,
 167                 struct proc *proc, struct uthread *uthread);
 168 #else
 169 void    audit_syscall_exit(int error, struct proc *proc,
 170                         struct uthread *uthread);
 171 #endif
 172 void    audit_mach_syscall_enter(unsigned short audit_event);
 173 void    audit_mach_syscall_exit(int retval, struct uthread *uthread);
 174
 175 extern struct auditinfo_addr *audit_default_aia_p;
 176
 177 /*
 178  * The remaining kernel functions are conditionally compiled in as they are
 179  * wrapped by a macro, and the macro should be the only place in the source
 180  * tree where these functions are referenced.
 181  */
 182 #if CONFIG_AUDIT
 183 struct ipc_perm;
 184 struct sockaddr;
 185 union auditon_udata;
 186 void     audit_arg_addr(struct kaudit_record *ar, user_addr_t addr);
 187 void     audit_arg_exit(struct kaudit_record *ar, int status, int retval);
 188 void     audit_arg_len(struct kaudit_record *ar, user_size_t len);
 189 void     audit_arg_fd(struct kaudit_record *ar, int fd);
 190 void     audit_arg_fd2(struct kaudit_record *ar, int fd);
 191 void     audit_arg_fflags(struct kaudit_record *ar, int fflags);
 192 void     audit_arg_gid(struct kaudit_record *ar, gid_t gid);
 193 void     audit_arg_uid(struct kaudit_record *ar, uid_t uid);
 194 void     audit_arg_egid(struct kaudit_record *ar, gid_t egid);
 195 void     audit_arg_euid(struct kaudit_record *ar, uid_t euid);
 196 void     audit_arg_rgid(struct kaudit_record *ar, gid_t rgid);
 197 void     audit_arg_ruid(struct kaudit_record *ar, uid_t ruid);
 198 void     audit_arg_sgid(struct kaudit_record *ar, gid_t sgid);
 199 void     audit_arg_suid(struct kaudit_record *ar, uid_t suid);
 200 void     audit_arg_groupset(struct kaudit_record *ar, gid_t *gidset,
 201                 u_int gidset_size);
 202 void     audit_arg_login(struct kaudit_record *ar, char *login);
 203 void     audit_arg_ctlname(struct kaudit_record *ar, int *name, int namelen);
 204 void     audit_arg_mask(struct kaudit_record *ar, int mask);
 205 void     audit_arg_mode(struct kaudit_record *ar, mode_t mode);
 206 void     audit_arg_value32(struct kaudit_record *ar, uint32_t value32);
 207 void     audit_arg_value64(struct kaudit_record *ar, uint64_t value64);
 208 void     audit_arg_owner(struct kaudit_record *ar, uid_t uid, gid_t gid);
 209 void     audit_arg_pid(struct kaudit_record *ar, pid_t pid);
 210 void     audit_arg_process(struct kaudit_record *ar, proc_t p);
 211 void     audit_arg_signum(struct kaudit_record *ar, u_int signum);
 212 void     audit_arg_socket(struct kaudit_record *ar, int sodomain, int sotype,
 213                 int soprotocol);
 214 void     audit_arg_sockaddr(struct kaudit_record *ar, struct vnode *cwd_vp,
 215                 struct sockaddr *so);
 216 void     audit_arg_auid(struct kaudit_record *ar, uid_t auid);
 217 void     audit_arg_auditinfo(struct kaudit_record *ar,
 218                 struct auditinfo *au_info);
 219 void     audit_arg_auditinfo_addr(struct kaudit_record *ar,
 220                 struct auditinfo_addr *au_info);
 221 void     audit_arg_upath(struct kaudit_record *ar, struct vnode *cwd_vp,
 222                 char *upath, u_int64_t flags);
 223 void     audit_arg_vnpath(struct kaudit_record *ar, struct vnode *vp,
 224                 u_int64_t flags);
 225 void     audit_arg_vnpath_withref(struct kaudit_record *ar, struct vnode *vp,
 226                 u_int64_t flags);
 227 void     audit_arg_text(struct kaudit_record *ar, char *text);
 228 void     audit_arg_opaque(struct kaudit_record *ar, void *data, size_t size);
 229 void     audit_arg_data(struct kaudit_record *ar, void *data, size_t size,
 230                 size_t number);
 231 void     audit_arg_cmd(struct kaudit_record *ar, int cmd);
 232 void     audit_arg_svipc_cmd(struct kaudit_record *ar, int cmd);
 233 void     audit_arg_svipc_perm(struct kaudit_record *ar, struct ipc_perm *perm);
 234 void     audit_arg_svipc_id(struct kaudit_record *ar, int id);
 235 void     audit_arg_svipc_addr(struct kaudit_record *ar, user_addr_t addr);
 236 void     audit_arg_posix_ipc_perm(struct kaudit_record *ar, uid_t uid,
 237                 gid_t gid, mode_t mode);
 238 void     audit_arg_auditon(struct kaudit_record *ar,
 239                 union auditon_udata *udata);
 240 void     audit_arg_file(struct kaudit_record *ar, struct proc *p,
 241                 struct fileproc *fp);
 242 void     audit_arg_argv(struct kaudit_record *ar, char *argv, int argc,
 243                 int length);
 244 void     audit_arg_envv(struct kaudit_record *ar, char *envv, int envc,
 245                 int length);
 246 void    audit_arg_identity(struct kaudit_record *ar);
 247
 248 void     audit_arg_mach_port1(struct kaudit_record *ar, mach_port_name_t port);
 249 void     audit_arg_mach_port2(struct kaudit_record *ar, mach_port_name_t port);
 250 void     audit_sysclose(struct kaudit_record *ar, struct proc *p, int fd);
 251
 252 void     audit_proc_coredump(proc_t proc, char *path, int errcode);
 253 void     audit_proc_init(struct proc *p);
 254 void     audit_proc_fork(struct proc *parent, struct proc *child);
 255 void     audit_proc_free(struct proc *p);
 256
 257 #ifndef _KAUTH_CRED_T
 258 #define _KAUTH_CRED_T
 259 struct ucred;
 260 typedef struct ucred *kauth_cred_t;
 261 #endif /* !_KAUTH_CRED_T */
 262
 263 void     audit_session_ref(kauth_cred_t cred);
 264 void     audit_session_unref(kauth_cred_t cred);
 265 void     audit_session_procnew(proc_t p);
 266 void     audit_session_procexit(proc_t p);
 267 int      audit_session_spawnjoin(proc_t p, task_t task, ipc_port_t port);
 268
 269 void     audit_sdev_submit(au_id_t auid, au_asid_t asid, void *record,
 270             u_int record_len);
 271
 272 /*
 273  * Audit session macros.
 274  */
 275 #define IS_VALID_SESSION(a)     ((a) != NULL && (a) != audit_default_aia_p)
 276
 277 #define AUDIT_SESSION_REF(cred)         audit_session_ref(cred)
 278 #define AUDIT_SESSION_UNREF(cred)       audit_session_unref(cred)
 279
 280 #define AUDIT_SESSION_PROCNEW(p)        audit_session_procnew(p)
 281 #define AUDIT_SESSION_PROCEXIT(p)       audit_session_procexit(p)
 282
 283 #if CONFIG_MACF
 284 /*
 285  * audit_mac_data() is the MAC Framework's entry point to the audit subsystem.
 286  * It currently creates only text and data audit tokens.
 287  */
 288 int      audit_mac_data(int type, int len, u_char *data);
 289 void     audit_arg_mac_string(struct kaudit_record *ar, char *string);
 290
 291 #endif
 292
 293 extern au_event_t sys_au_event[];
 294
 295 #define AUDIT_RECORD() \
 296         ((struct uthread*)get_bsdthread_info(current_thread()))->uu_ar
 297
 298 #ifndef AUDIT_USE_BUILTIN_EXPECT
 299 #define AUDIT_USE_BUILTIN_EXPECT
 300 #endif
 301
 302 #ifdef  AUDIT_USE_BUILTIN_EXPECT
 303 /*
 304  * Use branch prediction for the case of auditing enabled but not
 305  * auditing system calls.
 306  */
 307 #define AUDIT_SYSCALLS()        __builtin_expect(audit_syscalls, 0)
 308 #define AUDIT_ENABLED()         __builtin_expect(audit_syscalls &&      \
 309                                         audit_enabled, 0)
 310 #define AUDIT_AUDITING(x)       __builtin_expect(NULL != (x), 0)
 311
 312 #else
 313
 314 #define AUDIT_SYSCALLS()        (audit_syscalls)
 315 #define AUDIT_ENABLED()         (audit_syscalls && audit_enabled)
 316 #define AUDIT_AUDITING(x)       (NULL != (x))
 317
 318 #endif /* AUDIT_USE_BUILTIN_EXPECT */
 319
 320 /*
 321  * Define a macro to wrap the audit_arg_* calls by checking the global
 322  * audit_enabled flag before performing the actual call.
 323  */
 324 #define AUDIT_ARG(op, args...)  do {                                    \
 325         if (AUDIT_SYSCALLS()) {                                         \
 326                 struct kaudit_record *__ar = AUDIT_RECORD();            \
 327                 if (AUDIT_AUDITING(__ar))                               \
 328                         audit_arg_ ## op (__ar, ## args);               \
 329         }                                                               \
 330 } while (0)
 331
 332 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 333         if (AUDIT_ENABLED()) {                                  \
 334                 audit_syscall_enter(args);                              \
 335         }                                                               \
 336 } while (0)
 337
 338 /*
 339  * Wrap the audit_syscall_exit() function so that it is called only when
 340  * we have a audit record on the thread.  Audit records can persist after
 341  * auditing is disabled, so we don't just check audit_enabled here.
 342  */
 343 #define AUDIT_SYSCALL_EXIT(code, proc, uthread, error)  do {            \
 344                 if (AUDIT_AUDITING(uthread->uu_ar))                     \
 345                         audit_syscall_exit(code, error, proc, uthread); \
 346 } while (0)
 347
 348 /*
 349  * Wrap the audit_mach_syscall_enter() and audit_mach_syscall_exit()
 350  * functions in a manner similar to other system call enter/exit functions.
 351  */
 352 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 353         if (AUDIT_ENABLED()) {                                  \
 354                 audit_mach_syscall_enter(args);                         \
 355         }                                                               \
 356 } while (0)
 357
 358 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 359         if (AUDIT_SYSCALLS()) {                                         \
 360                 struct uthread *__uthread =                             \
 361                         get_bsdthread_info(current_thread());           \
 362                 if (AUDIT_AUDITING(__uthread->uu_ar))                   \
 363                         audit_mach_syscall_exit(retval, __uthread);     \
 364         }                                                               \
 365 } while (0)
 366
 367 /*
 368  * A Macro to wrap the audit_sysclose() function.
 369  */
 370 #define AUDIT_SYSCLOSE(args...) do {                                    \
 371         if (AUDIT_SYSCALLS()) {                                         \
 372                 struct kaudit_record *__ar = AUDIT_RECORD();            \
 373                 if (AUDIT_AUDITING(__ar))                               \
 374                         audit_sysclose(__ar, args);                     \
 375         }                                                               \
 376 } while (0)
 377
 378 #else /* !CONFIG_AUDIT */
 379
 380 #define AUDIT_ARG(op, args...)  do {                                    \
 381 } while (0)
 382
 383 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 384 } while (0)
 385
 386 #define AUDIT_SYSCALL_EXIT(code, proc, uthread, error)  do {            \
 387 } while (0)
 388
 389 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 390 } while (0)
 391
 392 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 393 } while (0)
 394
 395 #define AUDIT_SYSCLOSE(op, args...)     do {                            \
 396 } while (0)
 397
 398 #define AUDIT_SESSION_REF(cred)         do {                            \
 399 } while (0)
 400
 401 #define AUDIT_SESSION_UNREF(cred)       do {                            \
 402 } while (0)
 403
 404 #define AUDIT_SESSION_PROCNEW(cred)     do {                            \
 405 } while (0)
 406
 407 #define AUDIT_SESSION_PROCEXIT(cred)    do {                            \
 408 } while (0)
 409
 410 #define AUDIT_SESSION_REF(cred)         do {                            \
 411 } while (0)
 412
 413 #define AUDIT_SESSION_UNREF(cred)       do {                            \
 414 } while (0)
 415
 416 #define AUDIT_SESSION_PROCNEW(cred)     do {                            \
 417 } while (0)
 418
 419 #define AUDIT_SESSION_PROCEXIT(cred)    do {                            \
 420 } while (0)
 421
 422 #endif /* CONFIG_AUDIT */
 423
 424 #endif /* KERNEL */
 425
 426 #endif /* !_SECURITY_AUDIT_ADUIT_H */