1 /* audit -- definition of audit_context structure and supporting types 2 * 3 * Copyright 2003-2004 Red Hat, Inc. 4 * Copyright 2005 Hewlett-Packard Development Company, L.P. 5 * Copyright 2005 IBM Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <linux/fs.h> 23 #include <linux/audit.h> 24 #include <linux/skbuff.h> 25 #include <uapi/linux/mqueue.h> 26 27 /* 0 = no checking 28 1 = put_count checking 29 2 = verbose put_count checking 30 */ 31 #define AUDIT_DEBUG 0 32 33 /* AUDIT_NAMES is the number of slots we reserve in the audit_context 34 * for saving names from getname(). If we get more names we will allocate 35 * a name dynamically and also add those to the list anchored by names_list. */ 36 #define AUDIT_NAMES 5 37 38 /* At task start time, the audit_state is set in the audit_context using 39 a per-task filter. At syscall entry, the audit_state is augmented by 40 the syscall filter. */ 41 enum audit_state { 42 AUDIT_DISABLED, /* Do not create per-task audit_context. 43 * No syscall-specific audit records can 44 * be generated. */ 45 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 46 * and fill it in at syscall 47 * entry time. This makes a full 48 * syscall record available if some 49 * other part of the kernel decides it 50 * should be recorded. */ 51 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 52 * always fill it in at syscall entry 53 * time, and always write out the audit 54 * record at syscall exit time. */ 55 }; 56 57 /* Rule lists */ 58 struct audit_watch; 59 struct audit_tree; 60 struct audit_chunk; 61 62 struct audit_entry { 63 struct list_head list; 64 struct rcu_head rcu; 65 struct audit_krule rule; 66 }; 67 68 struct audit_cap_data { 69 kernel_cap_t permitted; 70 kernel_cap_t inheritable; 71 union { 72 unsigned int fE; /* effective bit of file cap */ 73 kernel_cap_t effective; /* effective set of process */ 74 }; 75 }; 76 77 /* When fs/namei.c:getname() is called, we store the pointer in name and 78 * we don't let putname() free it (instead we free all of the saved 79 * pointers at syscall exit time). 80 * 81 * Further, in fs/namei.c:path_lookup() we store the inode and device. 82 */ 83 struct audit_names { 84 struct list_head list; /* audit_context->names_list */ 85 86 struct filename *name; 87 int name_len; /* number of chars to log */ 88 bool hidden; /* don't log this record */ 89 bool name_put; /* call __putname()? */ 90 91 unsigned long ino; 92 dev_t dev; 93 umode_t mode; 94 kuid_t uid; 95 kgid_t gid; 96 dev_t rdev; 97 u32 osid; 98 struct audit_cap_data fcap; 99 unsigned int fcap_ver; 100 unsigned char type; /* record type */ 101 /* 102 * This was an allocated audit_names and not from the array of 103 * names allocated in the task audit context. Thus this name 104 * should be freed on syscall exit. 105 */ 106 bool should_free; 107 }; 108 109 struct audit_proctitle { 110 int len; /* length of the cmdline field. */ 111 char *value; /* the cmdline field */ 112 }; 113 114 /* The per-task audit context. */ 115 struct audit_context { 116 int dummy; /* must be the first element */ 117 int in_syscall; /* 1 if task is in a syscall */ 118 enum audit_state state, current_state; 119 unsigned int serial; /* serial number for record */ 120 int major; /* syscall number */ 121 struct timespec ctime; /* time of syscall entry */ 122 unsigned long argv[4]; /* syscall arguments */ 123 long return_code;/* syscall return code */ 124 u64 prio; 125 int return_valid; /* return code is valid */ 126 /* 127 * The names_list is the list of all audit_names collected during this 128 * syscall. The first AUDIT_NAMES entries in the names_list will 129 * actually be from the preallocated_names array for performance 130 * reasons. Except during allocation they should never be referenced 131 * through the preallocated_names array and should only be found/used 132 * by running the names_list. 133 */ 134 struct audit_names preallocated_names[AUDIT_NAMES]; 135 int name_count; /* total records in names_list */ 136 struct list_head names_list; /* struct audit_names->list anchor */ 137 char *filterkey; /* key for rule that triggered record */ 138 struct path pwd; 139 struct audit_aux_data *aux; 140 struct audit_aux_data *aux_pids; 141 struct sockaddr_storage *sockaddr; 142 size_t sockaddr_len; 143 /* Save things to print about task_struct */ 144 pid_t pid, ppid; 145 kuid_t uid, euid, suid, fsuid; 146 kgid_t gid, egid, sgid, fsgid; 147 unsigned long personality; 148 int arch; 149 150 pid_t target_pid; 151 kuid_t target_auid; 152 kuid_t target_uid; 153 unsigned int target_sessionid; 154 u32 target_sid; 155 char target_comm[TASK_COMM_LEN]; 156 157 struct audit_tree_refs *trees, *first_trees; 158 struct list_head killed_trees; 159 int tree_count; 160 161 int type; 162 union { 163 struct { 164 int nargs; 165 long args[6]; 166 } socketcall; 167 struct { 168 kuid_t uid; 169 kgid_t gid; 170 umode_t mode; 171 u32 osid; 172 int has_perm; 173 uid_t perm_uid; 174 gid_t perm_gid; 175 umode_t perm_mode; 176 unsigned long qbytes; 177 } ipc; 178 struct { 179 mqd_t mqdes; 180 struct mq_attr mqstat; 181 } mq_getsetattr; 182 struct { 183 mqd_t mqdes; 184 int sigev_signo; 185 } mq_notify; 186 struct { 187 mqd_t mqdes; 188 size_t msg_len; 189 unsigned int msg_prio; 190 struct timespec abs_timeout; 191 } mq_sendrecv; 192 struct { 193 int oflag; 194 umode_t mode; 195 struct mq_attr attr; 196 } mq_open; 197 struct { 198 pid_t pid; 199 struct audit_cap_data cap; 200 } capset; 201 struct { 202 int fd; 203 int flags; 204 } mmap; 205 struct { 206 int argc; 207 } execve; 208 }; 209 int fds[2]; 210 struct audit_proctitle proctitle; 211 212 #if AUDIT_DEBUG 213 int put_count; 214 int ino_count; 215 #endif 216 }; 217 218 extern u32 audit_ever_enabled; 219 220 extern void audit_copy_inode(struct audit_names *name, 221 const struct dentry *dentry, 222 const struct inode *inode); 223 extern void audit_log_cap(struct audit_buffer *ab, char *prefix, 224 kernel_cap_t *cap); 225 extern void audit_log_name(struct audit_context *context, 226 struct audit_names *n, struct path *path, 227 int record_num, int *call_panic); 228 229 extern int audit_pid; 230 231 #define AUDIT_INODE_BUCKETS 32 232 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 233 234 static inline int audit_hash_ino(u32 ino) 235 { 236 return (ino & (AUDIT_INODE_BUCKETS-1)); 237 } 238 239 /* Indicates that audit should log the full pathname. */ 240 #define AUDIT_NAME_FULL -1 241 242 extern int audit_match_class(int class, unsigned syscall); 243 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 244 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 245 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 246 extern int parent_len(const char *path); 247 extern int audit_compare_dname_path(const char *dname, const char *path, int plen); 248 extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, 249 int done, int multi, 250 const void *payload, int size); 251 extern void audit_panic(const char *message); 252 253 struct audit_netlink_list { 254 __u32 portid; 255 struct net *net; 256 struct sk_buff_head q; 257 }; 258 259 int audit_send_list(void *); 260 261 struct audit_net { 262 struct sock *nlsk; 263 }; 264 265 extern int selinux_audit_rule_update(void); 266 267 extern struct mutex audit_filter_mutex; 268 extern void audit_free_rule_rcu(struct rcu_head *); 269 extern struct list_head audit_filter_list[]; 270 271 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 272 273 /* audit watch functions */ 274 #ifdef CONFIG_AUDIT_WATCH 275 extern void audit_put_watch(struct audit_watch *watch); 276 extern void audit_get_watch(struct audit_watch *watch); 277 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 278 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 279 extern void audit_remove_watch_rule(struct audit_krule *krule); 280 extern char *audit_watch_path(struct audit_watch *watch); 281 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 282 #else 283 #define audit_put_watch(w) {} 284 #define audit_get_watch(w) {} 285 #define audit_to_watch(k, p, l, o) (-EINVAL) 286 #define audit_add_watch(k, l) (-EINVAL) 287 #define audit_remove_watch_rule(k) BUG() 288 #define audit_watch_path(w) "" 289 #define audit_watch_compare(w, i, d) 0 290 291 #endif /* CONFIG_AUDIT_WATCH */ 292 293 #ifdef CONFIG_AUDIT_TREE 294 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 295 extern void audit_put_chunk(struct audit_chunk *); 296 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 297 extern int audit_make_tree(struct audit_krule *, char *, u32); 298 extern int audit_add_tree_rule(struct audit_krule *); 299 extern int audit_remove_tree_rule(struct audit_krule *); 300 extern void audit_trim_trees(void); 301 extern int audit_tag_tree(char *old, char *new); 302 extern const char *audit_tree_path(struct audit_tree *); 303 extern void audit_put_tree(struct audit_tree *); 304 extern void audit_kill_trees(struct list_head *); 305 #else 306 #define audit_remove_tree_rule(rule) BUG() 307 #define audit_add_tree_rule(rule) -EINVAL 308 #define audit_make_tree(rule, str, op) -EINVAL 309 #define audit_trim_trees() (void)0 310 #define audit_put_tree(tree) (void)0 311 #define audit_tag_tree(old, new) -EINVAL 312 #define audit_tree_path(rule) "" /* never called */ 313 #define audit_kill_trees(list) BUG() 314 #endif 315 316 extern char *audit_unpack_string(void **, size_t *, size_t); 317 318 extern pid_t audit_sig_pid; 319 extern kuid_t audit_sig_uid; 320 extern u32 audit_sig_sid; 321 322 #ifdef CONFIG_AUDITSYSCALL 323 extern int __audit_signal_info(int sig, struct task_struct *t); 324 static inline int audit_signal_info(int sig, struct task_struct *t) 325 { 326 if (unlikely((audit_pid && t->tgid == audit_pid) || 327 (audit_signals && !audit_dummy_context()))) 328 return __audit_signal_info(sig, t); 329 return 0; 330 } 331 extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 332 extern struct list_head *audit_killed_trees(void); 333 #else 334 #define audit_signal_info(s,t) AUDIT_DISABLED 335 #define audit_filter_inodes(t,c) AUDIT_DISABLED 336 #endif 337 338 extern struct mutex audit_cmd_mutex; 339