1 /* audit.h -- Auditing support 2 * 3 * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. 4 * All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * Written by Rickard E. (Rik) Faith <[email protected]> 21 * 22 */ 23 24 #ifndef _LINUX_AUDIT_H_ 25 #define _LINUX_AUDIT_H_ 26 27 #include <linux/sched.h> 28 #include <linux/elf.h> 29 30 /* The netlink messages for the audit system is divided into blocks: 31 * 1000 - 1099 are for commanding the audit system 32 * 1100 - 1199 user space trusted application messages 33 * 1200 - 1299 messages internal to the audit daemon 34 * 1300 - 1399 audit event messages 35 * 1400 - 1499 SE Linux use 36 * 1500 - 1599 kernel LSPP events 37 * 1600 - 1699 kernel crypto events 38 * 1700 - 1799 kernel anomaly records 39 * 1800 - 1999 future kernel use (maybe integrity labels and related events) 40 * 2000 is for otherwise unclassified kernel audit messages (legacy) 41 * 2001 - 2099 unused (kernel) 42 * 2100 - 2199 user space anomaly records 43 * 2200 - 2299 user space actions taken in response to anomalies 44 * 2300 - 2399 user space generated LSPP events 45 * 2400 - 2499 user space crypto events 46 * 2500 - 2999 future user space (maybe integrity labels and related events) 47 * 48 * Messages from 1000-1199 are bi-directional. 1200-1299 & 2100 - 2999 are 49 * exclusively user space. 1300-2099 is kernel --> user space 50 * communication. 51 */ 52 #define AUDIT_GET 1000 /* Get status */ 53 #define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */ 54 #define AUDIT_LIST 1002 /* List syscall rules -- deprecated */ 55 #define AUDIT_ADD 1003 /* Add syscall rule -- deprecated */ 56 #define AUDIT_DEL 1004 /* Delete syscall rule -- deprecated */ 57 #define AUDIT_USER 1005 /* Message from userspace -- deprecated */ 58 #define AUDIT_LOGIN 1006 /* Define the login id and information */ 59 #define AUDIT_WATCH_INS 1007 /* Insert file/dir watch entry */ 60 #define AUDIT_WATCH_REM 1008 /* Remove file/dir watch entry */ 61 #define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */ 62 #define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */ 63 #define AUDIT_ADD_RULE 1011 /* Add syscall filtering rule */ 64 #define AUDIT_DEL_RULE 1012 /* Delete syscall filtering rule */ 65 #define AUDIT_LIST_RULES 1013 /* List syscall filtering rules */ 66 67 #define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */ 68 #define AUDIT_USER_AVC 1107 /* We filter this differently */ 69 #define AUDIT_LAST_USER_MSG 1199 70 #define AUDIT_FIRST_USER_MSG2 2100 /* More user space messages */ 71 #define AUDIT_LAST_USER_MSG2 2999 72 73 #define AUDIT_DAEMON_START 1200 /* Daemon startup record */ 74 #define AUDIT_DAEMON_END 1201 /* Daemon normal stop record */ 75 #define AUDIT_DAEMON_ABORT 1202 /* Daemon error stop record */ 76 #define AUDIT_DAEMON_CONFIG 1203 /* Daemon config change */ 77 78 #define AUDIT_SYSCALL 1300 /* Syscall event */ 79 #define AUDIT_FS_WATCH 1301 /* Filesystem watch event */ 80 #define AUDIT_PATH 1302 /* Filename path information */ 81 #define AUDIT_IPC 1303 /* IPC record */ 82 #define AUDIT_SOCKETCALL 1304 /* sys_socketcall arguments */ 83 #define AUDIT_CONFIG_CHANGE 1305 /* Audit system configuration change */ 84 #define AUDIT_SOCKADDR 1306 /* sockaddr copied as syscall arg */ 85 #define AUDIT_CWD 1307 /* Current working directory */ 86 87 #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */ 88 #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */ 89 #define AUDIT_AVC_PATH 1402 /* dentry, vfsmount pair from avc */ 90 #define AUDIT_MAC_POLICY_LOAD 1403 /* Policy file load */ 91 #define AUDIT_MAC_STATUS 1404 /* Changed enforcing,permissive,off */ 92 #define AUDIT_MAC_CONFIG_CHANGE 1405 /* Changes to booleans */ 93 94 #define AUDIT_FIRST_KERN_ANOM_MSG 1700 95 #define AUDIT_LAST_KERN_ANOM_MSG 1799 96 #define AUDIT_ANOM_PROMISCUOUS 1700 /* Device changed promiscuous mode */ 97 98 #define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */ 99 100 /* Rule flags */ 101 #define AUDIT_FILTER_USER 0x00 /* Apply rule to user-generated messages */ 102 #define AUDIT_FILTER_TASK 0x01 /* Apply rule at task creation (not syscall) */ 103 #define AUDIT_FILTER_ENTRY 0x02 /* Apply rule at syscall entry */ 104 #define AUDIT_FILTER_WATCH 0x03 /* Apply rule to file system watches */ 105 #define AUDIT_FILTER_EXIT 0x04 /* Apply rule at syscall exit */ 106 #define AUDIT_FILTER_TYPE 0x05 /* Apply rule at audit_log_start */ 107 108 #define AUDIT_NR_FILTERS 6 109 110 #define AUDIT_FILTER_PREPEND 0x10 /* Prepend to front of list */ 111 112 /* Rule actions */ 113 #define AUDIT_NEVER 0 /* Do not build context if rule matches */ 114 #define AUDIT_POSSIBLE 1 /* Build context if rule matches */ 115 #define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */ 116 117 /* Rule structure sizes -- if these change, different AUDIT_ADD and 118 * AUDIT_LIST commands must be implemented. */ 119 #define AUDIT_MAX_FIELDS 64 120 #define AUDIT_BITMASK_SIZE 64 121 #define AUDIT_WORD(nr) ((__u32)((nr)/32)) 122 #define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32)) 123 124 /* This bitmask is used to validate user input. It represents all bits that 125 * are currently used in an audit field constant understood by the kernel. 126 * If you are adding a new #define AUDIT_<whatever>, please ensure that 127 * AUDIT_UNUSED_BITS is updated if need be. */ 128 #define AUDIT_UNUSED_BITS 0x0FFFFC00 129 130 131 /* Rule fields */ 132 /* These are useful when checking the 133 * task structure at task creation time 134 * (AUDIT_PER_TASK). */ 135 #define AUDIT_PID 0 136 #define AUDIT_UID 1 137 #define AUDIT_EUID 2 138 #define AUDIT_SUID 3 139 #define AUDIT_FSUID 4 140 #define AUDIT_GID 5 141 #define AUDIT_EGID 6 142 #define AUDIT_SGID 7 143 #define AUDIT_FSGID 8 144 #define AUDIT_LOGINUID 9 145 #define AUDIT_PERS 10 146 #define AUDIT_ARCH 11 147 #define AUDIT_MSGTYPE 12 148 149 /* These are ONLY useful when checking 150 * at syscall exit time (AUDIT_AT_EXIT). */ 151 #define AUDIT_DEVMAJOR 100 152 #define AUDIT_DEVMINOR 101 153 #define AUDIT_INODE 102 154 #define AUDIT_EXIT 103 155 #define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */ 156 157 #define AUDIT_ARG0 200 158 #define AUDIT_ARG1 (AUDIT_ARG0+1) 159 #define AUDIT_ARG2 (AUDIT_ARG0+2) 160 #define AUDIT_ARG3 (AUDIT_ARG0+3) 161 162 #define AUDIT_NEGATE 0x80000000 163 164 /* These are the supported operators. 165 * 4 2 1 166 * = > < 167 * ------- 168 * 0 0 0 0 nonsense 169 * 0 0 1 1 < 170 * 0 1 0 2 > 171 * 0 1 1 3 != 172 * 1 0 0 4 = 173 * 1 0 1 5 <= 174 * 1 1 0 6 >= 175 * 1 1 1 7 all operators 176 */ 177 #define AUDIT_LESS_THAN 0x10000000 178 #define AUDIT_GREATER_THAN 0x20000000 179 #define AUDIT_NOT_EQUAL 0x30000000 180 #define AUDIT_EQUAL 0x40000000 181 #define AUDIT_LESS_THAN_OR_EQUAL (AUDIT_LESS_THAN|AUDIT_EQUAL) 182 #define AUDIT_GREATER_THAN_OR_EQUAL (AUDIT_GREATER_THAN|AUDIT_EQUAL) 183 #define AUDIT_OPERATORS (AUDIT_EQUAL|AUDIT_NOT_EQUAL) 184 185 /* Status symbols */ 186 /* Mask values */ 187 #define AUDIT_STATUS_ENABLED 0x0001 188 #define AUDIT_STATUS_FAILURE 0x0002 189 #define AUDIT_STATUS_PID 0x0004 190 #define AUDIT_STATUS_RATE_LIMIT 0x0008 191 #define AUDIT_STATUS_BACKLOG_LIMIT 0x0010 192 /* Failure-to-log actions */ 193 #define AUDIT_FAIL_SILENT 0 194 #define AUDIT_FAIL_PRINTK 1 195 #define AUDIT_FAIL_PANIC 2 196 197 /* distinguish syscall tables */ 198 #define __AUDIT_ARCH_64BIT 0x80000000 199 #define __AUDIT_ARCH_LE 0x40000000 200 #define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 201 #define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE) 202 #define AUDIT_ARCH_ARMEB (EM_ARM) 203 #define AUDIT_ARCH_CRIS (EM_CRIS|__AUDIT_ARCH_LE) 204 #define AUDIT_ARCH_FRV (EM_FRV) 205 #define AUDIT_ARCH_H8300 (EM_H8_300) 206 #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 207 #define AUDIT_ARCH_IA64 (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 208 #define AUDIT_ARCH_M32R (EM_M32R) 209 #define AUDIT_ARCH_M68K (EM_68K) 210 #define AUDIT_ARCH_MIPS (EM_MIPS) 211 #define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE) 212 #define AUDIT_ARCH_MIPS64 (EM_MIPS|__AUDIT_ARCH_64BIT) 213 #define AUDIT_ARCH_MIPSEL64 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 214 #define AUDIT_ARCH_PARISC (EM_PARISC) 215 #define AUDIT_ARCH_PARISC64 (EM_PARISC|__AUDIT_ARCH_64BIT) 216 #define AUDIT_ARCH_PPC (EM_PPC) 217 #define AUDIT_ARCH_PPC64 (EM_PPC64|__AUDIT_ARCH_64BIT) 218 #define AUDIT_ARCH_S390 (EM_S390) 219 #define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT) 220 #define AUDIT_ARCH_SH (EM_SH) 221 #define AUDIT_ARCH_SHEL (EM_SH|__AUDIT_ARCH_LE) 222 #define AUDIT_ARCH_SH64 (EM_SH|__AUDIT_ARCH_64BIT) 223 #define AUDIT_ARCH_SHEL64 (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 224 #define AUDIT_ARCH_SPARC (EM_SPARC) 225 #define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT) 226 #define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE) 227 #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 228 229 struct audit_status { 230 __u32 mask; /* Bit mask for valid entries */ 231 __u32 enabled; /* 1 = enabled, 0 = disabled */ 232 __u32 failure; /* Failure-to-log action */ 233 __u32 pid; /* pid of auditd process */ 234 __u32 rate_limit; /* messages rate limit (per second) */ 235 __u32 backlog_limit; /* waiting messages limit */ 236 __u32 lost; /* messages lost */ 237 __u32 backlog; /* messages waiting in queue */ 238 }; 239 240 /* audit_rule_data supports filter rules with both integer and string 241 * fields. It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and 242 * AUDIT_LIST_RULES requests. 243 */ 244 struct audit_rule_data { 245 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */ 246 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */ 247 __u32 field_count; 248 __u32 mask[AUDIT_BITMASK_SIZE]; /* syscall(s) affected */ 249 __u32 fields[AUDIT_MAX_FIELDS]; 250 __u32 values[AUDIT_MAX_FIELDS]; 251 __u32 fieldflags[AUDIT_MAX_FIELDS]; 252 __u32 buflen; /* total length of string fields */ 253 char buf[0]; /* string fields buffer */ 254 }; 255 256 /* audit_rule is supported to maintain backward compatibility with 257 * userspace. It supports integer fields only and corresponds to 258 * AUDIT_ADD, AUDIT_DEL and AUDIT_LIST requests. 259 */ 260 struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */ 261 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */ 262 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */ 263 __u32 field_count; 264 __u32 mask[AUDIT_BITMASK_SIZE]; 265 __u32 fields[AUDIT_MAX_FIELDS]; 266 __u32 values[AUDIT_MAX_FIELDS]; 267 }; 268 269 #ifdef __KERNEL__ 270 271 struct audit_sig_info { 272 uid_t uid; 273 pid_t pid; 274 }; 275 276 struct audit_buffer; 277 struct audit_context; 278 struct inode; 279 struct netlink_skb_parms; 280 281 #define AUDITSC_INVALID 0 282 #define AUDITSC_SUCCESS 1 283 #define AUDITSC_FAILURE 2 284 #define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS ) 285 #ifdef CONFIG_AUDITSYSCALL 286 /* These are defined in auditsc.c */ 287 /* Public API */ 288 extern int audit_alloc(struct task_struct *task); 289 extern void audit_free(struct task_struct *task); 290 extern void audit_syscall_entry(struct task_struct *task, int arch, 291 int major, unsigned long a0, unsigned long a1, 292 unsigned long a2, unsigned long a3); 293 extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code); 294 extern void audit_getname(const char *name); 295 extern void audit_putname(const char *name); 296 extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags); 297 extern void __audit_inode_child(const char *dname, const struct inode *inode, 298 unsigned long pino); 299 static inline void audit_inode(const char *name, const struct inode *inode, 300 unsigned flags) { 301 if (unlikely(current->audit_context)) 302 __audit_inode(name, inode, flags); 303 } 304 static inline void audit_inode_child(const char *dname, 305 const struct inode *inode, 306 unsigned long pino) { 307 if (unlikely(current->audit_context)) 308 __audit_inode_child(dname, inode, pino); 309 } 310 311 /* Private API (for audit.c only) */ 312 extern unsigned int audit_serial(void); 313 extern void auditsc_get_stamp(struct audit_context *ctx, 314 struct timespec *t, unsigned int *serial); 315 extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid); 316 extern uid_t audit_get_loginuid(struct audit_context *ctx); 317 extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp); 318 extern int audit_socketcall(int nargs, unsigned long *args); 319 extern int audit_sockaddr(int len, void *addr); 320 extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt); 321 extern void audit_signal_info(int sig, struct task_struct *t); 322 extern int audit_set_macxattr(const char *name); 323 #else 324 #define audit_alloc(t) ({ 0; }) 325 #define audit_free(t) do { ; } while (0) 326 #define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0) 327 #define audit_syscall_exit(t,f,r) do { ; } while (0) 328 #define audit_getname(n) do { ; } while (0) 329 #define audit_putname(n) do { ; } while (0) 330 #define __audit_inode(n,i,f) do { ; } while (0) 331 #define __audit_inode_child(d,i,p) do { ; } while (0) 332 #define audit_inode(n,i,f) do { ; } while (0) 333 #define audit_inode_child(d,i,p) do { ; } while (0) 334 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0) 335 #define audit_get_loginuid(c) ({ -1; }) 336 #define audit_ipc_perms(q,u,g,m,i) ({ 0; }) 337 #define audit_socketcall(n,a) ({ 0; }) 338 #define audit_sockaddr(len, addr) ({ 0; }) 339 #define audit_avc_path(dentry, mnt) ({ 0; }) 340 #define audit_signal_info(s,t) do { ; } while (0) 341 #define audit_set_macxattr(n) do { ; } while (0) 342 #endif 343 344 #ifdef CONFIG_AUDIT 345 /* These are defined in audit.c */ 346 /* Public API */ 347 extern void audit_log(struct audit_context *ctx, gfp_t gfp_mask, 348 int type, const char *fmt, ...) 349 __attribute__((format(printf,4,5))); 350 351 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type); 352 extern void audit_log_format(struct audit_buffer *ab, 353 const char *fmt, ...) 354 __attribute__((format(printf,2,3))); 355 extern void audit_log_end(struct audit_buffer *ab); 356 extern void audit_log_hex(struct audit_buffer *ab, 357 const unsigned char *buf, 358 size_t len); 359 extern void audit_log_untrustedstring(struct audit_buffer *ab, 360 const char *string); 361 extern void audit_log_d_path(struct audit_buffer *ab, 362 const char *prefix, 363 struct dentry *dentry, 364 struct vfsmount *vfsmnt); 365 /* Private API (for audit.c only) */ 366 extern int audit_filter_user(struct netlink_skb_parms *cb, int type); 367 extern int audit_filter_type(int type); 368 extern int audit_receive_filter(int type, int pid, int uid, int seq, 369 void *data, size_t datasz, uid_t loginuid); 370 #else 371 #define audit_log(c,g,t,f,...) do { ; } while (0) 372 #define audit_log_start(c,g,t) ({ NULL; }) 373 #define audit_log_vformat(b,f,a) do { ; } while (0) 374 #define audit_log_format(b,f,...) do { ; } while (0) 375 #define audit_log_end(b) do { ; } while (0) 376 #define audit_log_hex(a,b,l) do { ; } while (0) 377 #define audit_log_untrustedstring(a,s) do { ; } while (0) 378 #define audit_log_d_path(b,p,d,v) do { ; } while (0) 379 #define audit_panic(m) do { ; } while (0) 380 #endif 381 #endif 382 #endif 383