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 name_put; /* call __putname()? */ 89 90 unsigned long ino; 91 dev_t dev; 92 umode_t mode; 93 kuid_t uid; 94 kgid_t gid; 95 dev_t rdev; 96 u32 osid; 97 struct audit_cap_data fcap; 98 unsigned int fcap_ver; 99 unsigned char type; /* record type */ 100 /* 101 * This was an allocated audit_names and not from the array of 102 * names allocated in the task audit context. Thus this name 103 * should be freed on syscall exit. 104 */ 105 bool should_free; 106 }; 107 108 /* The per-task audit context. */ 109 struct audit_context { 110 int dummy; /* must be the first element */ 111 int in_syscall; /* 1 if task is in a syscall */ 112 enum audit_state state, current_state; 113 unsigned int serial; /* serial number for record */ 114 int major; /* syscall number */ 115 struct timespec ctime; /* time of syscall entry */ 116 unsigned long argv[4]; /* syscall arguments */ 117 long return_code;/* syscall return code */ 118 u64 prio; 119 int return_valid; /* return code is valid */ 120 /* 121 * The names_list is the list of all audit_names collected during this 122 * syscall. The first AUDIT_NAMES entries in the names_list will 123 * actually be from the preallocated_names array for performance 124 * reasons. Except during allocation they should never be referenced 125 * through the preallocated_names array and should only be found/used 126 * by running the names_list. 127 */ 128 struct audit_names preallocated_names[AUDIT_NAMES]; 129 int name_count; /* total records in names_list */ 130 struct list_head names_list; /* struct audit_names->list anchor */ 131 char *filterkey; /* key for rule that triggered record */ 132 struct path pwd; 133 struct audit_aux_data *aux; 134 struct audit_aux_data *aux_pids; 135 struct sockaddr_storage *sockaddr; 136 size_t sockaddr_len; 137 /* Save things to print about task_struct */ 138 pid_t pid, ppid; 139 kuid_t uid, euid, suid, fsuid; 140 kgid_t gid, egid, sgid, fsgid; 141 unsigned long personality; 142 int arch; 143 144 pid_t target_pid; 145 kuid_t target_auid; 146 kuid_t target_uid; 147 unsigned int target_sessionid; 148 u32 target_sid; 149 char target_comm[TASK_COMM_LEN]; 150 151 struct audit_tree_refs *trees, *first_trees; 152 struct list_head killed_trees; 153 int tree_count; 154 155 int type; 156 union { 157 struct { 158 int nargs; 159 long args[6]; 160 } socketcall; 161 struct { 162 kuid_t uid; 163 kgid_t gid; 164 umode_t mode; 165 u32 osid; 166 int has_perm; 167 uid_t perm_uid; 168 gid_t perm_gid; 169 umode_t perm_mode; 170 unsigned long qbytes; 171 } ipc; 172 struct { 173 mqd_t mqdes; 174 struct mq_attr mqstat; 175 } mq_getsetattr; 176 struct { 177 mqd_t mqdes; 178 int sigev_signo; 179 } mq_notify; 180 struct { 181 mqd_t mqdes; 182 size_t msg_len; 183 unsigned int msg_prio; 184 struct timespec abs_timeout; 185 } mq_sendrecv; 186 struct { 187 int oflag; 188 umode_t mode; 189 struct mq_attr attr; 190 } mq_open; 191 struct { 192 pid_t pid; 193 struct audit_cap_data cap; 194 } capset; 195 struct { 196 int fd; 197 int flags; 198 } mmap; 199 }; 200 int fds[2]; 201 202 #if AUDIT_DEBUG 203 int put_count; 204 int ino_count; 205 #endif 206 }; 207 208 extern int audit_ever_enabled; 209 210 extern void audit_copy_inode(struct audit_names *name, 211 const struct dentry *dentry, 212 const struct inode *inode); 213 extern void audit_log_cap(struct audit_buffer *ab, char *prefix, 214 kernel_cap_t *cap); 215 extern void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name); 216 extern void audit_log_name(struct audit_context *context, 217 struct audit_names *n, struct path *path, 218 int record_num, int *call_panic); 219 220 extern int audit_pid; 221 222 #define AUDIT_INODE_BUCKETS 32 223 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 224 225 static inline int audit_hash_ino(u32 ino) 226 { 227 return (ino & (AUDIT_INODE_BUCKETS-1)); 228 } 229 230 /* Indicates that audit should log the full pathname. */ 231 #define AUDIT_NAME_FULL -1 232 233 extern int audit_match_class(int class, unsigned syscall); 234 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 235 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 236 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 237 extern int parent_len(const char *path); 238 extern int audit_compare_dname_path(const char *dname, const char *path, int plen); 239 extern struct sk_buff * audit_make_reply(int pid, int seq, int type, 240 int done, int multi, 241 const void *payload, int size); 242 extern void audit_panic(const char *message); 243 244 struct audit_netlink_list { 245 int pid; 246 struct sk_buff_head q; 247 }; 248 249 int audit_send_list(void *); 250 251 extern int selinux_audit_rule_update(void); 252 253 extern struct mutex audit_filter_mutex; 254 extern void audit_free_rule_rcu(struct rcu_head *); 255 extern struct list_head audit_filter_list[]; 256 257 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 258 259 /* audit watch functions */ 260 #ifdef CONFIG_AUDIT_WATCH 261 extern void audit_put_watch(struct audit_watch *watch); 262 extern void audit_get_watch(struct audit_watch *watch); 263 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 264 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 265 extern void audit_remove_watch_rule(struct audit_krule *krule); 266 extern char *audit_watch_path(struct audit_watch *watch); 267 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 268 #else 269 #define audit_put_watch(w) {} 270 #define audit_get_watch(w) {} 271 #define audit_to_watch(k, p, l, o) (-EINVAL) 272 #define audit_add_watch(k, l) (-EINVAL) 273 #define audit_remove_watch_rule(k) BUG() 274 #define audit_watch_path(w) "" 275 #define audit_watch_compare(w, i, d) 0 276 277 #endif /* CONFIG_AUDIT_WATCH */ 278 279 #ifdef CONFIG_AUDIT_TREE 280 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 281 extern void audit_put_chunk(struct audit_chunk *); 282 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 283 extern int audit_make_tree(struct audit_krule *, char *, u32); 284 extern int audit_add_tree_rule(struct audit_krule *); 285 extern int audit_remove_tree_rule(struct audit_krule *); 286 extern void audit_trim_trees(void); 287 extern int audit_tag_tree(char *old, char *new); 288 extern const char *audit_tree_path(struct audit_tree *); 289 extern void audit_put_tree(struct audit_tree *); 290 extern void audit_kill_trees(struct list_head *); 291 #else 292 #define audit_remove_tree_rule(rule) BUG() 293 #define audit_add_tree_rule(rule) -EINVAL 294 #define audit_make_tree(rule, str, op) -EINVAL 295 #define audit_trim_trees() (void)0 296 #define audit_put_tree(tree) (void)0 297 #define audit_tag_tree(old, new) -EINVAL 298 #define audit_tree_path(rule) "" /* never called */ 299 #define audit_kill_trees(list) BUG() 300 #endif 301 302 extern char *audit_unpack_string(void **, size_t *, size_t); 303 304 extern pid_t audit_sig_pid; 305 extern kuid_t audit_sig_uid; 306 extern u32 audit_sig_sid; 307 308 #ifdef CONFIG_AUDITSYSCALL 309 extern int __audit_signal_info(int sig, struct task_struct *t); 310 static inline int audit_signal_info(int sig, struct task_struct *t) 311 { 312 if (unlikely((audit_pid && t->tgid == audit_pid) || 313 (audit_signals && !audit_dummy_context()))) 314 return __audit_signal_info(sig, t); 315 return 0; 316 } 317 extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 318 extern struct list_head *audit_killed_trees(void); 319 #else 320 #define audit_signal_info(s,t) AUDIT_DISABLED 321 #define audit_filter_inodes(t,c) AUDIT_DISABLED 322 #endif 323 324 extern struct mutex audit_cmd_mutex; 325