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 - 1999 future use 37 * 2000 is for otherwise unclassified kernel audit messages 38 * 39 * Messages from 1000-1199 are bi-directional. 1200-1299 are exclusively user 40 * space. Anything over that is kernel --> user space communication. 41 */ 42 #define AUDIT_GET 1000 /* Get status */ 43 #define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */ 44 #define AUDIT_LIST 1002 /* List syscall filtering rules */ 45 #define AUDIT_ADD 1003 /* Add syscall filtering rule */ 46 #define AUDIT_DEL 1004 /* Delete syscall filtering rule */ 47 #define AUDIT_USER 1005 /* Message from userspace -- deprecated */ 48 #define AUDIT_LOGIN 1006 /* Define the login id and information */ 49 #define AUDIT_WATCH_INS 1007 /* Insert file/dir watch entry */ 50 #define AUDIT_WATCH_REM 1008 /* Remove file/dir watch entry */ 51 #define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */ 52 #define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */ 53 54 #define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */ 55 #define AUDIT_USER_AVC 1107 /* We filter this differently */ 56 #define AUDIT_LAST_USER_MSG 1199 57 58 #define AUDIT_DAEMON_START 1200 /* Daemon startup record */ 59 #define AUDIT_DAEMON_END 1201 /* Daemon normal stop record */ 60 #define AUDIT_DAEMON_ABORT 1202 /* Daemon error stop record */ 61 #define AUDIT_DAEMON_CONFIG 1203 /* Daemon config change */ 62 63 #define AUDIT_SYSCALL 1300 /* Syscall event */ 64 #define AUDIT_FS_WATCH 1301 /* Filesystem watch event */ 65 #define AUDIT_PATH 1302 /* Filename path information */ 66 #define AUDIT_IPC 1303 /* IPC record */ 67 #define AUDIT_SOCKETCALL 1304 /* sys_socketcall arguments */ 68 #define AUDIT_CONFIG_CHANGE 1305 /* Audit system configuration change */ 69 #define AUDIT_SOCKADDR 1306 /* sockaddr copied as syscall arg */ 70 #define AUDIT_CWD 1307 /* Current working directory */ 71 72 #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */ 73 #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */ 74 #define AUDIT_AVC_PATH 1402 /* dentry, vfsmount pair from avc */ 75 76 #define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */ 77 78 /* Rule flags */ 79 #define AUDIT_FILTER_USER 0x00 /* Apply rule to user-generated messages */ 80 #define AUDIT_FILTER_TASK 0x01 /* Apply rule at task creation (not syscall) */ 81 #define AUDIT_FILTER_ENTRY 0x02 /* Apply rule at syscall entry */ 82 #define AUDIT_FILTER_WATCH 0x03 /* Apply rule to file system watches */ 83 #define AUDIT_FILTER_EXIT 0x04 /* Apply rule at syscall exit */ 84 85 #define AUDIT_NR_FILTERS 5 86 87 #define AUDIT_FILTER_PREPEND 0x10 /* Prepend to front of list */ 88 89 /* Rule actions */ 90 #define AUDIT_NEVER 0 /* Do not build context if rule matches */ 91 #define AUDIT_POSSIBLE 1 /* Build context if rule matches */ 92 #define AUDIT_ALWAYS 2 /* Generate audit record if rule matches */ 93 94 /* Rule structure sizes -- if these change, different AUDIT_ADD and 95 * AUDIT_LIST commands must be implemented. */ 96 #define AUDIT_MAX_FIELDS 64 97 #define AUDIT_BITMASK_SIZE 64 98 #define AUDIT_WORD(nr) ((__u32)((nr)/32)) 99 #define AUDIT_BIT(nr) (1 << ((nr) - AUDIT_WORD(nr)*32)) 100 101 /* Rule fields */ 102 /* These are useful when checking the 103 * task structure at task creation time 104 * (AUDIT_PER_TASK). */ 105 #define AUDIT_PID 0 106 #define AUDIT_UID 1 107 #define AUDIT_EUID 2 108 #define AUDIT_SUID 3 109 #define AUDIT_FSUID 4 110 #define AUDIT_GID 5 111 #define AUDIT_EGID 6 112 #define AUDIT_SGID 7 113 #define AUDIT_FSGID 8 114 #define AUDIT_LOGINUID 9 115 #define AUDIT_PERS 10 116 #define AUDIT_ARCH 11 117 118 /* These are ONLY useful when checking 119 * at syscall exit time (AUDIT_AT_EXIT). */ 120 #define AUDIT_DEVMAJOR 100 121 #define AUDIT_DEVMINOR 101 122 #define AUDIT_INODE 102 123 #define AUDIT_EXIT 103 124 #define AUDIT_SUCCESS 104 /* exit >= 0; value ignored */ 125 126 #define AUDIT_ARG0 200 127 #define AUDIT_ARG1 (AUDIT_ARG0+1) 128 #define AUDIT_ARG2 (AUDIT_ARG0+2) 129 #define AUDIT_ARG3 (AUDIT_ARG0+3) 130 131 #define AUDIT_NEGATE 0x80000000 132 133 134 /* Status symbols */ 135 /* Mask values */ 136 #define AUDIT_STATUS_ENABLED 0x0001 137 #define AUDIT_STATUS_FAILURE 0x0002 138 #define AUDIT_STATUS_PID 0x0004 139 #define AUDIT_STATUS_RATE_LIMIT 0x0008 140 #define AUDIT_STATUS_BACKLOG_LIMIT 0x0010 141 /* Failure-to-log actions */ 142 #define AUDIT_FAIL_SILENT 0 143 #define AUDIT_FAIL_PRINTK 1 144 #define AUDIT_FAIL_PANIC 2 145 146 /* distinguish syscall tables */ 147 #define __AUDIT_ARCH_64BIT 0x80000000 148 #define __AUDIT_ARCH_LE 0x40000000 149 #define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 150 #define AUDIT_ARCH_ARM (EM_ARM|__AUDIT_ARCH_LE) 151 #define AUDIT_ARCH_ARMEB (EM_ARM) 152 #define AUDIT_ARCH_CRIS (EM_CRIS|__AUDIT_ARCH_LE) 153 #define AUDIT_ARCH_FRV (EM_FRV) 154 #define AUDIT_ARCH_H8300 (EM_H8_300) 155 #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) 156 #define AUDIT_ARCH_IA64 (EM_IA_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 157 #define AUDIT_ARCH_M32R (EM_M32R) 158 #define AUDIT_ARCH_M68K (EM_68K) 159 #define AUDIT_ARCH_MIPS (EM_MIPS) 160 #define AUDIT_ARCH_MIPSEL (EM_MIPS|__AUDIT_ARCH_LE) 161 #define AUDIT_ARCH_MIPS64 (EM_MIPS|__AUDIT_ARCH_64BIT) 162 #define AUDIT_ARCH_MIPSEL64 (EM_MIPS|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 163 #define AUDIT_ARCH_PARISC (EM_PARISC) 164 #define AUDIT_ARCH_PARISC64 (EM_PARISC|__AUDIT_ARCH_64BIT) 165 #define AUDIT_ARCH_PPC (EM_PPC) 166 #define AUDIT_ARCH_PPC64 (EM_PPC64|__AUDIT_ARCH_64BIT) 167 #define AUDIT_ARCH_S390 (EM_S390) 168 #define AUDIT_ARCH_S390X (EM_S390|__AUDIT_ARCH_64BIT) 169 #define AUDIT_ARCH_SH (EM_SH) 170 #define AUDIT_ARCH_SHEL (EM_SH|__AUDIT_ARCH_LE) 171 #define AUDIT_ARCH_SH64 (EM_SH|__AUDIT_ARCH_64BIT) 172 #define AUDIT_ARCH_SHEL64 (EM_SH|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 173 #define AUDIT_ARCH_SPARC (EM_SPARC) 174 #define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT) 175 #define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE) 176 #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 177 178 struct audit_status { 179 __u32 mask; /* Bit mask for valid entries */ 180 __u32 enabled; /* 1 = enabled, 0 = disabled */ 181 __u32 failure; /* Failure-to-log action */ 182 __u32 pid; /* pid of auditd process */ 183 __u32 rate_limit; /* messages rate limit (per second) */ 184 __u32 backlog_limit; /* waiting messages limit */ 185 __u32 lost; /* messages lost */ 186 __u32 backlog; /* messages waiting in queue */ 187 }; 188 189 struct audit_rule { /* for AUDIT_LIST, AUDIT_ADD, and AUDIT_DEL */ 190 __u32 flags; /* AUDIT_PER_{TASK,CALL}, AUDIT_PREPEND */ 191 __u32 action; /* AUDIT_NEVER, AUDIT_POSSIBLE, AUDIT_ALWAYS */ 192 __u32 field_count; 193 __u32 mask[AUDIT_BITMASK_SIZE]; 194 __u32 fields[AUDIT_MAX_FIELDS]; 195 __u32 values[AUDIT_MAX_FIELDS]; 196 }; 197 198 #ifdef __KERNEL__ 199 200 struct audit_sig_info { 201 uid_t uid; 202 pid_t pid; 203 }; 204 205 struct audit_buffer; 206 struct audit_context; 207 struct inode; 208 struct netlink_skb_parms; 209 210 #define AUDITSC_INVALID 0 211 #define AUDITSC_SUCCESS 1 212 #define AUDITSC_FAILURE 2 213 #define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS ) 214 #ifdef CONFIG_AUDITSYSCALL 215 /* These are defined in auditsc.c */ 216 /* Public API */ 217 extern int audit_alloc(struct task_struct *task); 218 extern void audit_free(struct task_struct *task); 219 extern void audit_syscall_entry(struct task_struct *task, int arch, 220 int major, unsigned long a0, unsigned long a1, 221 unsigned long a2, unsigned long a3); 222 extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code); 223 extern void audit_getname(const char *name); 224 extern void audit_putname(const char *name); 225 extern void audit_inode(const char *name, const struct inode *inode, unsigned flags); 226 227 /* Private API (for audit.c only) */ 228 extern int audit_receive_filter(int type, int pid, int uid, int seq, 229 void *data, uid_t loginuid); 230 extern unsigned int audit_serial(void); 231 extern void auditsc_get_stamp(struct audit_context *ctx, 232 struct timespec *t, unsigned int *serial); 233 extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid); 234 extern uid_t audit_get_loginuid(struct audit_context *ctx); 235 extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode); 236 extern int audit_socketcall(int nargs, unsigned long *args); 237 extern int audit_sockaddr(int len, void *addr); 238 extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt); 239 extern void audit_signal_info(int sig, struct task_struct *t); 240 extern int audit_filter_user(struct netlink_skb_parms *cb, int type); 241 #else 242 #define audit_alloc(t) ({ 0; }) 243 #define audit_free(t) do { ; } while (0) 244 #define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0) 245 #define audit_syscall_exit(t,f,r) do { ; } while (0) 246 #define audit_getname(n) do { ; } while (0) 247 #define audit_putname(n) do { ; } while (0) 248 #define audit_inode(n,i,f) do { ; } while (0) 249 #define audit_receive_filter(t,p,u,s,d,l) ({ -EOPNOTSUPP; }) 250 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0) 251 #define audit_get_loginuid(c) ({ -1; }) 252 #define audit_ipc_perms(q,u,g,m) ({ 0; }) 253 #define audit_socketcall(n,a) ({ 0; }) 254 #define audit_sockaddr(len, addr) ({ 0; }) 255 #define audit_avc_path(dentry, mnt) ({ 0; }) 256 #define audit_signal_info(s,t) do { ; } while (0) 257 #define audit_filter_user(cb,t) ({ 1; }) 258 #endif 259 260 #ifdef CONFIG_AUDIT 261 /* These are defined in audit.c */ 262 /* Public API */ 263 extern void audit_log(struct audit_context *ctx, gfp_t gfp_mask, 264 int type, const char *fmt, ...) 265 __attribute__((format(printf,4,5))); 266 267 extern struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type); 268 extern void audit_log_format(struct audit_buffer *ab, 269 const char *fmt, ...) 270 __attribute__((format(printf,2,3))); 271 extern void audit_log_end(struct audit_buffer *ab); 272 extern void audit_log_hex(struct audit_buffer *ab, 273 const unsigned char *buf, 274 size_t len); 275 extern void audit_log_untrustedstring(struct audit_buffer *ab, 276 const char *string); 277 extern void audit_log_d_path(struct audit_buffer *ab, 278 const char *prefix, 279 struct dentry *dentry, 280 struct vfsmount *vfsmnt); 281 /* Private API (for auditsc.c only) */ 282 extern void audit_send_reply(int pid, int seq, int type, 283 int done, int multi, 284 void *payload, int size); 285 extern void audit_log_lost(const char *message); 286 extern struct semaphore audit_netlink_sem; 287 #else 288 #define audit_log(c,g,t,f,...) do { ; } while (0) 289 #define audit_log_start(c,g,t) ({ NULL; }) 290 #define audit_log_vformat(b,f,a) do { ; } while (0) 291 #define audit_log_format(b,f,...) do { ; } while (0) 292 #define audit_log_end(b) do { ; } while (0) 293 #define audit_log_hex(a,b,l) do { ; } while (0) 294 #define audit_log_untrustedstring(a,s) do { ; } while (0) 295 #define audit_log_d_path(b,p,d,v) do { ; } while (0) 296 #endif 297 #endif 298 #endif 299