bsd/security/audit/audit.h

   1 /*-
   2  * Copyright (c) 2004-2009 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  */
  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 #if CONFIG_MACF
  48 #include <sys/queue.h>
  49 #include <security/mac_framework.h>
  50 #endif
  51
  52 #include <bsm/audit.h>
  53
  54 #include <sys/sysctl.h>
  55 #include <sys/user.h>
  56 #include <sys/ipc.h>
  57
  58 /*
  59  * Audit subsystem condition flags.  The audit_enabled flag is set and
  60  * removed automatically as a result of configuring log files, and can be
  61  * observed but should not be directly manipulated.  The audit suspension
  62  * flag permits audit to be temporarily disabled without reconfiguring the
  63  * audit target. The audit syscalls flag is set at the first hint that kernel
  64  * events (system and mach calls) need to be audited.  It is used for
  65  * performance so an event class map table lookup doesn't have be done for
  66  * every system call if only user events are being audited.
  67  */
  68 extern int      audit_enabled;
  69 extern int      audit_suspended;
  70 extern int      audit_syscalls;
  71
  72 /*
  73  * Define the masks for the audited arguments.
  74  *
  75  * XXXRW: These need to remain in audit.h for now because our vnode and name
  76  * lookup audit calls rely on passing in flags to indicate which name or
  77  * vnode is being logged.  These should move to audit_private.h when that is
  78  * fixed.
  79  */
  80 #define ARG_EUID                0x0000000000000001ULL
  81 #define ARG_RUID                0x0000000000000002ULL
  82 #define ARG_SUID                0x0000000000000004ULL
  83 #define ARG_EGID                0x0000000000000008ULL
  84 #define ARG_RGID                0x0000000000000010ULL
  85 #define ARG_SGID                0x0000000000000020ULL
  86 #define ARG_PID                 0x0000000000000040ULL
  87 #define ARG_UID                 0x0000000000000080ULL
  88 #define ARG_AUID                0x0000000000000100ULL
  89 #define ARG_GID                 0x0000000000000200ULL
  90 #define ARG_FD                  0x0000000000000400ULL
  91 #define ARG_POSIX_IPC_PERM      0x0000000000000800ULL
  92 #define ARG_FFLAGS              0x0000000000001000ULL
  93 #define ARG_MODE                0x0000000000002000ULL
  94 #define ARG_VALUE32             0x0000000000004000ULL
  95 #define ARG_ADDR32              0x0000000000008000ULL
  96 #define ARG_ADDR                ARG_ADDR32
  97 #define ARG_LEN                 0x0000000000010000ULL
  98 #define ARG_MASK                0x0000000000020000ULL
  99 #define ARG_SIGNUM              0x0000000000040000ULL
 100 #define ARG_LOGIN               0x0000000000080000ULL
 101 #define ARG_SADDRINET           0x0000000000100000ULL
 102 #define ARG_SADDRINET6          0x0000000000200000ULL
 103 #define ARG_SADDRUNIX           0x0000000000400000ULL
 104 #define ARG_TERMID_ADDR         ARG_SADDRUNIX
 105 #define ARG_KPATH1              0x0000000000800000ULL   /* darwin-only */
 106 #define ARG_KPATH2              0x0000000001000000ULL   /* darwin-only */
 107 #define ARG_UPATH1              0x0000000002000000ULL
 108 #define ARG_UPATH2              0x0000000004000000ULL
 109 #define ARG_TEXT                0x0000000008000000ULL
 110 #define ARG_VNODE1              0x0000000010000000ULL
 111 #define ARG_VNODE2              0x0000000020000000ULL
 112 #define ARG_SVIPC_CMD           0x0000000040000000ULL
 113 #define ARG_SVIPC_PERM          0x0000000080000000ULL
 114 #define ARG_SVIPC_ID            0x0000000100000000ULL
 115 #define ARG_SVIPC_ADDR          0x0000000200000000ULL
 116 #define ARG_GROUPSET            0x0000000400000000ULL
 117 #define ARG_CMD                 0x0000000800000000ULL
 118 #define ARG_SOCKINFO            0x0000001000000000ULL
 119 #define ARG_ASID                0x0000002000000000ULL
 120 #define ARG_TERMID              0x0000004000000000ULL
 121 #define ARG_AUDITON             0x0000008000000000ULL
 122 #define ARG_VALUE64             0x0000010000000000ULL   /* darwin-only */
 123 #define ARG_AMASK               0x0000020000000000ULL
 124 #define ARG_CTLNAME             0x0000040000000000ULL
 125 #define ARG_PROCESS             0x0000080000000000ULL
 126 #define ARG_MACHPORT1           0x0000100000000000ULL
 127 #define ARG_MACHPORT2           0x0000200000000000ULL
 128 #define ARG_MAC_STRING          0x0000400000000000ULL
 129 #define ARG_EXIT                0x0000800000000000ULL
 130 #define ARG_IOVECSTR            0x0001000000000000ULL
 131 #define ARG_ARGV                0x0002000000000000ULL
 132 #define ARG_ENVV                0x0004000000000000ULL
 133 #define ARG_OPAQUE              0x0008000000000000ULL   /* darwin-only */
 134 #define ARG_DATA                0x0010000000000000ULL   /* darwin-only */
 135 #define ARG_ADDR64              0x0020000000000000ULL   /* darwin-only */
 136 #define ARG_NONE                0x0000000000000000ULL
 137 #define ARG_ALL                 0xFFFFFFFFFFFFFFFFULL
 138
 139 #if CONFIG_MACF
 140
 141 #define MAC_AUDIT_LABEL_LEN 1024
 142 #define MAC_AUDIT_DATA_TYPE 0
 143 #define MAC_AUDIT_TEXT_TYPE 1
 144
 145 struct mac_audit_record {
 146         int type;               /* one of the types defined above */
 147         int length;             /* byte length of the data field */
 148         u_char *data;           /* the payload */
 149         LIST_ENTRY(mac_audit_record) records;
 150 };
 151
 152 #endif
 153
 154 struct proc;
 155 struct vnode;
 156 struct componentname;
 157
 158 int                      kau_will_audit(void);
 159 void                     audit_init(void);
 160 void                     audit_shutdown(void);
 161 void                     audit_syscall_enter(unsigned int code,
 162                                 struct proc *proc, struct uthread *uthread);
 163 #if CONFIG_MACF
 164 /*
 165  * The parameter list of audit_syscall_exit() was modified to also take the
 166  * Darwin syscall number, which is required by mac_audit_check_postselect().
 167  */
 168 void    audit_syscall_exit(unsigned int code, int error,
 169                 struct proc *proc, struct uthread *uthread);
 170 #else
 171 void    audit_syscall_exit(int error, struct proc *proc,
 172                         struct uthread *uthread);
 173 #endif
 174 void    audit_mach_syscall_enter(unsigned short audit_event);
 175 void    audit_mach_syscall_exit(int retval, struct uthread *uthread);
 176
 177 extern struct auditinfo_addr audit_default_aia;
 178
 179 /*
 180  * The remaining kernel functions are conditionally compiled in as they are
 181  * wrapped by a macro, and the macro should be the only place in the source
 182  * tree where these functions are referenced.
 183  */
 184 #if CONFIG_AUDIT
 185 struct ipc_perm;
 186 struct sockaddr;
 187 union auditon_udata;
 188 void     audit_arg_addr(struct kaudit_record *ar, user_addr_t addr);
 189 void     audit_arg_exit(struct kaudit_record *ar, int status, int retval);
 190 void     audit_arg_len(struct kaudit_record *ar, user_size_t len);
 191 void     audit_arg_fd(struct kaudit_record *ar, int fd);
 192 void     audit_arg_fflags(struct kaudit_record *ar, int fflags);
 193 void     audit_arg_gid(struct kaudit_record *ar, gid_t gid);
 194 void     audit_arg_uid(struct kaudit_record *ar, uid_t uid);
 195 void     audit_arg_egid(struct kaudit_record *ar, gid_t egid);
 196 void     audit_arg_euid(struct kaudit_record *ar, uid_t euid);
 197 void     audit_arg_rgid(struct kaudit_record *ar, gid_t rgid);
 198 void     audit_arg_ruid(struct kaudit_record *ar, uid_t ruid);
 199 void     audit_arg_sgid(struct kaudit_record *ar, gid_t sgid);
 200 void     audit_arg_suid(struct kaudit_record *ar, uid_t suid);
 201 void     audit_arg_groupset(struct kaudit_record *ar, gid_t *gidset,
 202                 u_int gidset_size);
 203 void     audit_arg_login(struct kaudit_record *ar, char *login);
 204 void     audit_arg_ctlname(struct kaudit_record *ar, int *name, int namelen);
 205 void     audit_arg_mask(struct kaudit_record *ar, int mask);
 206 void     audit_arg_mode(struct kaudit_record *ar, mode_t mode);
 207 void     audit_arg_value32(struct kaudit_record *ar, uint32_t value32);
 208 void     audit_arg_value64(struct kaudit_record *ar, uint64_t value64);
 209 void     audit_arg_owner(struct kaudit_record *ar, uid_t uid, gid_t gid);
 210 void     audit_arg_pid(struct kaudit_record *ar, pid_t pid);
 211 void     audit_arg_process(struct kaudit_record *ar, proc_t p);
 212 void     audit_arg_signum(struct kaudit_record *ar, u_int signum);
 213 void     audit_arg_socket(struct kaudit_record *ar, int sodomain, int sotype,
 214                 int soprotocol);
 215 void     audit_arg_sockaddr(struct kaudit_record *ar, struct vnode *cwd_vp,
 216                 struct sockaddr *so);
 217 void     audit_arg_auid(struct kaudit_record *ar, uid_t auid);
 218 void     audit_arg_auditinfo(struct kaudit_record *ar,
 219                 struct auditinfo *au_info);
 220 void     audit_arg_auditinfo_addr(struct kaudit_record *ar,
 221                 struct auditinfo_addr *au_info);
 222 void     audit_arg_upath(struct kaudit_record *ar, struct vnode *cwd_vp,
 223                 char *upath, u_int64_t flags);
 224 void     audit_arg_vnpath(struct kaudit_record *ar, struct vnode *vp,
 225                 u_int64_t flags);
 226 void     audit_arg_vnpath_withref(struct kaudit_record *ar, struct vnode *vp,
 227                 u_int64_t flags);
 228 void     audit_arg_text(struct kaudit_record *ar, char *text);
 229 void     audit_arg_opaque(struct kaudit_record *ar, void *data, size_t size);
 230 void     audit_arg_data(struct kaudit_record *ar, void *data, size_t size,
 231                 size_t number);
 232 void     audit_arg_cmd(struct kaudit_record *ar, int cmd);
 233 void     audit_arg_svipc_cmd(struct kaudit_record *ar, int cmd);
 234 void     audit_arg_svipc_perm(struct kaudit_record *ar, struct ipc_perm *perm);
 235 void     audit_arg_svipc_id(struct kaudit_record *ar, int id);
 236 void     audit_arg_svipc_addr(struct kaudit_record *ar, user_addr_t addr);
 237 void     audit_arg_posix_ipc_perm(struct kaudit_record *ar, uid_t uid,
 238                 gid_t gid, mode_t mode);
 239 void     audit_arg_auditon(struct kaudit_record *ar,
 240                 union auditon_udata *udata);
 241 void     audit_arg_file(struct kaudit_record *ar, struct proc *p,
 242                 struct fileproc *fp);
 243 void     audit_arg_argv(struct kaudit_record *ar, char *argv, int argc,
 244                 int length);
 245 void     audit_arg_envv(struct kaudit_record *ar, char *envv, int envc,
 246                 int length);
 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(kauth_cred_t cred);
 266 void     audit_session_procexit(kauth_cred_t cred);
 267 int      audit_session_spawnjoin(proc_t p, ipc_port_t port);
 268
 269 /*
 270  * Audit session macros.
 271  */
 272 #define IS_VALID_SESSION(a)     ((a) != NULL && (a) != &audit_default_aia)
 273
 274 #define AUDIT_SESSION_REF(cred)         audit_session_ref(cred)
 275 #define AUDIT_SESSION_UNREF(cred)       audit_session_unref(cred)
 276
 277 #define AUDIT_SESSION_PROCNEW(cred)     audit_session_procnew(cred)
 278 #define AUDIT_SESSION_PROCEXIT(cred)    audit_session_procexit(cred)
 279
 280 #if CONFIG_MACF
 281 /*
 282  * audit_mac_data() is the MAC Framework's entry point to the audit subsystem.
 283  * It currently creates only text and data audit tokens.
 284  */
 285 int      audit_mac_data(int type, int len, u_char *data);
 286 void     audit_arg_mac_string(struct kaudit_record *ar, char *string);
 287
 288 #endif
 289
 290 extern au_event_t sys_au_event[];
 291
 292 #define AUDIT_RECORD() \
 293         ((struct uthread*)get_bsdthread_info(current_thread()))->uu_ar
 294
 295 #ifndef AUDIT_USE_BUILDIN_EXPECT
 296 #define AUDIT_USE_BUILDIN_EXPECT
 297 #endif
 298
 299 #ifdef  AUDIT_USE_BUILTIN_EXPECT
 300 /*
 301  * Use branch prediction for the case of auditing enabled but not
 302  * auditing system calls.
 303  */
 304 #define AUDIT_SYSCALLS()        __builtin_expect(audit_syscalls, 0)
 305 #define AUDIT_ENABLED()         __builtin_expect(audit_syscalls &&      \
 306                                         audit_enabled, 0)
 307 #define AUDIT_AUDITING(x)       __builtin_expect(NULL != (x), 0)
 308
 309 #else
 310
 311 #define AUDIT_SYSCALLS()        (audit_syscalls)
 312 #define AUDIT_ENABLED()         (audit_syscalls && audit_enabled)
 313 #define AUDIT_AUDITING(x)       (NULL != (x))
 314
 315 #endif /* AUDIT_USE_BUILTIN_EXPECT */
 316
 317 /*
 318  * Define a macro to wrap the audit_arg_* calls by checking the global
 319  * audit_enabled flag before performing the actual call.
 320  */
 321 #define AUDIT_ARG(op, args...)  do {                                    \
 322         if (AUDIT_SYSCALLS()) {                                         \
 323                 struct kaudit_record *__ar = AUDIT_RECORD();            \
 324                 if (AUDIT_AUDITING(__ar))                               \
 325                         audit_arg_ ## op (__ar, args);                  \
 326         }                                                               \
 327 } while (0)
 328
 329 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 330         if (AUDIT_ENABLED()) {                                  \
 331                 audit_syscall_enter(args);                              \
 332         }                                                               \
 333 } while (0)
 334
 335 /*
 336  * Wrap the audit_syscall_exit() function so that it is called only when
 337  * we have a audit record on the thread.  Audit records can persist after
 338  * auditing is disabled, so we don't just check audit_enabled here.
 339  */
 340 #define AUDIT_SYSCALL_EXIT(code, proc, uthread, error)  do {            \
 341                 if (AUDIT_AUDITING(uthread->uu_ar))                     \
 342                         audit_syscall_exit(code, error, proc, uthread); \
 343 } while (0)
 344
 345 /*
 346  * Wrap the audit_mach_syscall_enter() and audit_mach_syscall_exit()
 347  * functions in a manner similar to other system call enter/exit functions.
 348  */
 349 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 350         if (AUDIT_ENABLED()) {                                  \
 351                 audit_mach_syscall_enter(args);                         \
 352         }                                                               \
 353 } while (0)
 354
 355 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 356         if (AUDIT_SYSCALLS()) {                                         \
 357                 struct uthread *__uthread =                             \
 358                         get_bsdthread_info(current_thread());           \
 359                 if (AUDIT_AUDITING(__uthread->uu_ar))                   \
 360                         audit_mach_syscall_exit(retval, __uthread);     \
 361         }                                                               \
 362 } while (0)
 363
 364 /*
 365  * A Macro to wrap the audit_sysclose() function.
 366  */
 367 #define AUDIT_SYSCLOSE(args...) do {                                    \
 368         if (AUDIT_SYSCALLS()) {                                         \
 369                 struct kaudit_record *__ar = AUDIT_RECORD();            \
 370                 if (AUDIT_AUDITING(__ar))                               \
 371                         audit_sysclose(__ar, args);                     \
 372         }                                                               \
 373 } while (0)
 374
 375 #else /* !CONFIG_AUDIT */
 376
 377 #define AUDIT_ARG(op, args...)  do {                                    \
 378 } while (0)
 379
 380 #define AUDIT_SYSCALL_ENTER(args...)    do {                            \
 381 } while (0)
 382
 383 #define AUDIT_SYSCALL_EXIT(code, proc, uthread, error)  do {            \
 384 } while (0)
 385
 386 #define AUDIT_MACH_SYSCALL_ENTER(args...)       do {                    \
 387 } while (0)
 388
 389 #define AUDIT_MACH_SYSCALL_EXIT(retval)         do {                    \
 390 } while (0)
 391
 392 #define AUDIT_SYSCLOSE(op, args...)     do {                            \
 393 } while (0)
 394
 395 #define AUDIT_SESSION_REF(cred)         do {                            \
 396 } while (0)
 397
 398 #define AUDIT_SESSION_UNREF(cred)       do {                            \
 399 } while (0)
 400
 401 #define AUDIT_SESSION_PROCNEW(cred)     do {                            \
 402 } while (0)
 403
 404 #define AUDIT_SESSION_PROCEXIT(cred)    do {                            \
 405 } while (0)
 406
 407 #define AUDIT_SESSION_REF(cred)         do {                            \
 408 } while (0)
 409
 410 #define AUDIT_SESSION_UNREF(cred)       do {                            \
 411 } while (0)
 412
 413 #define AUDIT_SESSION_PROCNEW(cred)     do {                            \
 414 } while (0)
 415
 416 #define AUDIT_SESSION_PROCEXIT(cred)    do {                            \
 417 } while (0)
 418
 419 #endif /* CONFIG_AUDIT */
 420
 421 #endif /* KERNEL */
 422
 423 #endif /* !_SECURITY_AUDIT_ADUIT_H */