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 /* AUDIT_NAMES is the number of slots we reserve in the audit_context 28 * for saving names from getname(). If we get more names we will allocate 29 * a name dynamically and also add those to the list anchored by names_list. */ 30 #define AUDIT_NAMES 5 31 32 /* At task start time, the audit_state is set in the audit_context using 33 a per-task filter. At syscall entry, the audit_state is augmented by 34 the syscall filter. */ 35 enum audit_state { 36 AUDIT_DISABLED, /* Do not create per-task audit_context. 37 * No syscall-specific audit records can 38 * be generated. */ 39 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 40 * and fill it in at syscall 41 * entry time. This makes a full 42 * syscall record available if some 43 * other part of the kernel decides it 44 * should be recorded. */ 45 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 46 * always fill it in at syscall entry 47 * time, and always write out the audit 48 * record at syscall exit time. */ 49 }; 50 51 /* Rule lists */ 52 struct audit_watch; 53 struct audit_tree; 54 struct audit_chunk; 55 56 struct audit_entry { 57 struct list_head list; 58 struct rcu_head rcu; 59 struct audit_krule rule; 60 }; 61 62 struct audit_cap_data { 63 kernel_cap_t permitted; 64 kernel_cap_t inheritable; 65 union { 66 unsigned int fE; /* effective bit of file cap */ 67 kernel_cap_t effective; /* effective set of process */ 68 }; 69 }; 70 71 /* When fs/namei.c:getname() is called, we store the pointer in name and bump 72 * the refcnt in the associated filename struct. 73 * 74 * Further, in fs/namei.c:path_lookup() we store the inode and device. 75 */ 76 struct audit_names { 77 struct list_head list; /* audit_context->names_list */ 78 79 struct filename *name; 80 int name_len; /* number of chars to log */ 81 bool hidden; /* don't log this record */ 82 83 unsigned long ino; 84 dev_t dev; 85 umode_t mode; 86 kuid_t uid; 87 kgid_t gid; 88 dev_t rdev; 89 u32 osid; 90 struct audit_cap_data fcap; 91 unsigned int fcap_ver; 92 unsigned char type; /* record type */ 93 /* 94 * This was an allocated audit_names and not from the array of 95 * names allocated in the task audit context. Thus this name 96 * should be freed on syscall exit. 97 */ 98 bool should_free; 99 }; 100 101 struct audit_proctitle { 102 int len; /* length of the cmdline field. */ 103 char *value; /* the cmdline field */ 104 }; 105 106 /* The per-task audit context. */ 107 struct audit_context { 108 int dummy; /* must be the first element */ 109 int in_syscall; /* 1 if task is in a syscall */ 110 enum audit_state state, current_state; 111 unsigned int serial; /* serial number for record */ 112 int major; /* syscall number */ 113 struct timespec ctime; /* time of syscall entry */ 114 unsigned long argv[4]; /* syscall arguments */ 115 long return_code;/* syscall return code */ 116 u64 prio; 117 int return_valid; /* return code is valid */ 118 /* 119 * The names_list is the list of all audit_names collected during this 120 * syscall. The first AUDIT_NAMES entries in the names_list will 121 * actually be from the preallocated_names array for performance 122 * reasons. Except during allocation they should never be referenced 123 * through the preallocated_names array and should only be found/used 124 * by running the names_list. 125 */ 126 struct audit_names preallocated_names[AUDIT_NAMES]; 127 int name_count; /* total records in names_list */ 128 struct list_head names_list; /* struct audit_names->list anchor */ 129 char *filterkey; /* key for rule that triggered record */ 130 struct path pwd; 131 struct audit_aux_data *aux; 132 struct audit_aux_data *aux_pids; 133 struct sockaddr_storage *sockaddr; 134 size_t sockaddr_len; 135 /* Save things to print about task_struct */ 136 pid_t pid, ppid; 137 kuid_t uid, euid, suid, fsuid; 138 kgid_t gid, egid, sgid, fsgid; 139 unsigned long personality; 140 int arch; 141 142 pid_t target_pid; 143 kuid_t target_auid; 144 kuid_t target_uid; 145 unsigned int target_sessionid; 146 u32 target_sid; 147 char target_comm[TASK_COMM_LEN]; 148 149 struct audit_tree_refs *trees, *first_trees; 150 struct list_head killed_trees; 151 int tree_count; 152 153 int type; 154 union { 155 struct { 156 int nargs; 157 long args[6]; 158 } socketcall; 159 struct { 160 kuid_t uid; 161 kgid_t gid; 162 umode_t mode; 163 u32 osid; 164 int has_perm; 165 uid_t perm_uid; 166 gid_t perm_gid; 167 umode_t perm_mode; 168 unsigned long qbytes; 169 } ipc; 170 struct { 171 mqd_t mqdes; 172 struct mq_attr mqstat; 173 } mq_getsetattr; 174 struct { 175 mqd_t mqdes; 176 int sigev_signo; 177 } mq_notify; 178 struct { 179 mqd_t mqdes; 180 size_t msg_len; 181 unsigned int msg_prio; 182 struct timespec abs_timeout; 183 } mq_sendrecv; 184 struct { 185 int oflag; 186 umode_t mode; 187 struct mq_attr attr; 188 } mq_open; 189 struct { 190 pid_t pid; 191 struct audit_cap_data cap; 192 } capset; 193 struct { 194 int fd; 195 int flags; 196 } mmap; 197 struct { 198 int argc; 199 } execve; 200 }; 201 int fds[2]; 202 struct audit_proctitle proctitle; 203 }; 204 205 extern u32 audit_ever_enabled; 206 207 extern void audit_copy_inode(struct audit_names *name, 208 const struct dentry *dentry, 209 const struct inode *inode); 210 extern void audit_log_cap(struct audit_buffer *ab, char *prefix, 211 kernel_cap_t *cap); 212 extern void audit_log_name(struct audit_context *context, 213 struct audit_names *n, struct path *path, 214 int record_num, int *call_panic); 215 216 extern int audit_pid; 217 218 #define AUDIT_INODE_BUCKETS 32 219 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 220 221 static inline int audit_hash_ino(u32 ino) 222 { 223 return (ino & (AUDIT_INODE_BUCKETS-1)); 224 } 225 226 /* Indicates that audit should log the full pathname. */ 227 #define AUDIT_NAME_FULL -1 228 229 extern int audit_match_class(int class, unsigned syscall); 230 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 231 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 232 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 233 extern int parent_len(const char *path); 234 extern int audit_compare_dname_path(const char *dname, const char *path, int plen); 235 extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, 236 int done, int multi, 237 const void *payload, int size); 238 extern void audit_panic(const char *message); 239 240 struct audit_netlink_list { 241 __u32 portid; 242 struct net *net; 243 struct sk_buff_head q; 244 }; 245 246 int audit_send_list(void *); 247 248 struct audit_net { 249 struct sock *nlsk; 250 }; 251 252 extern int selinux_audit_rule_update(void); 253 254 extern struct mutex audit_filter_mutex; 255 extern void audit_free_rule_rcu(struct rcu_head *); 256 extern struct list_head audit_filter_list[]; 257 258 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 259 260 extern void audit_log_d_path_exe(struct audit_buffer *ab, 261 struct mm_struct *mm); 262 263 /* audit watch functions */ 264 #ifdef CONFIG_AUDIT_WATCH 265 extern void audit_put_watch(struct audit_watch *watch); 266 extern void audit_get_watch(struct audit_watch *watch); 267 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 268 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 269 extern void audit_remove_watch_rule(struct audit_krule *krule); 270 extern char *audit_watch_path(struct audit_watch *watch); 271 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 272 #else 273 #define audit_put_watch(w) {} 274 #define audit_get_watch(w) {} 275 #define audit_to_watch(k, p, l, o) (-EINVAL) 276 #define audit_add_watch(k, l) (-EINVAL) 277 #define audit_remove_watch_rule(k) BUG() 278 #define audit_watch_path(w) "" 279 #define audit_watch_compare(w, i, d) 0 280 281 #endif /* CONFIG_AUDIT_WATCH */ 282 283 #ifdef CONFIG_AUDIT_TREE 284 extern struct audit_chunk *audit_tree_lookup(const struct inode *); 285 extern void audit_put_chunk(struct audit_chunk *); 286 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *); 287 extern int audit_make_tree(struct audit_krule *, char *, u32); 288 extern int audit_add_tree_rule(struct audit_krule *); 289 extern int audit_remove_tree_rule(struct audit_krule *); 290 extern void audit_trim_trees(void); 291 extern int audit_tag_tree(char *old, char *new); 292 extern const char *audit_tree_path(struct audit_tree *); 293 extern void audit_put_tree(struct audit_tree *); 294 extern void audit_kill_trees(struct list_head *); 295 #else 296 #define audit_remove_tree_rule(rule) BUG() 297 #define audit_add_tree_rule(rule) -EINVAL 298 #define audit_make_tree(rule, str, op) -EINVAL 299 #define audit_trim_trees() (void)0 300 #define audit_put_tree(tree) (void)0 301 #define audit_tag_tree(old, new) -EINVAL 302 #define audit_tree_path(rule) "" /* never called */ 303 #define audit_kill_trees(list) BUG() 304 #endif 305 306 extern char *audit_unpack_string(void **, size_t *, size_t); 307 308 extern pid_t audit_sig_pid; 309 extern kuid_t audit_sig_uid; 310 extern u32 audit_sig_sid; 311 312 #ifdef CONFIG_AUDITSYSCALL 313 extern int __audit_signal_info(int sig, struct task_struct *t); 314 static inline int audit_signal_info(int sig, struct task_struct *t) 315 { 316 if (unlikely((audit_pid && t->tgid == audit_pid) || 317 (audit_signals && !audit_dummy_context()))) 318 return __audit_signal_info(sig, t); 319 return 0; 320 } 321 extern void audit_filter_inodes(struct task_struct *, struct audit_context *); 322 extern struct list_head *audit_killed_trees(void); 323 #else 324 #define audit_signal_info(s,t) AUDIT_DISABLED 325 #define audit_filter_inodes(t,c) AUDIT_DISABLED 326 #endif 327 328 extern struct mutex audit_cmd_mutex; 329