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 #include <linux/tty.h> 27 28 /* AUDIT_NAMES is the number of slots we reserve in the audit_context 29 * for saving names from getname(). If we get more names we will allocate 30 * a name dynamically and also add those to the list anchored by names_list. */ 31 #define AUDIT_NAMES 5 32 33 /* At task start time, the audit_state is set in the audit_context using 34 a per-task filter. At syscall entry, the audit_state is augmented by 35 the syscall filter. */ 36 enum audit_state { 37 AUDIT_DISABLED, /* Do not create per-task audit_context. 38 * No syscall-specific audit records can 39 * be generated. */ 40 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 41 * and fill it in at syscall 42 * entry time. This makes a full 43 * syscall record available if some 44 * other part of the kernel decides it 45 * should be recorded. */ 46 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 47 * always fill it in at syscall entry 48 * time, and always write out the audit 49 * record at syscall exit time. */ 50 }; 51 52 /* Rule lists */ 53 struct audit_watch; 54 struct audit_fsnotify_mark; 55 struct audit_tree; 56 struct audit_chunk; 57 58 struct audit_entry { 59 struct list_head list; 60 struct rcu_head rcu; 61 struct audit_krule rule; 62 }; 63 64 struct audit_cap_data { 65 kernel_cap_t permitted; 66 kernel_cap_t inheritable; 67 union { 68 unsigned int fE; /* effective bit of file cap */ 69 kernel_cap_t effective; /* effective set of process */ 70 }; 71 kernel_cap_t ambient; 72 }; 73 74 /* When fs/namei.c:getname() is called, we store the pointer in name and bump 75 * the refcnt in the associated filename struct. 76 * 77 * Further, in fs/namei.c:path_lookup() we store the inode and device. 78 */ 79 struct audit_names { 80 struct list_head list; /* audit_context->names_list */ 81 82 struct filename *name; 83 int name_len; /* number of chars to log */ 84 bool hidden; /* don't log this record */ 85 86 unsigned long ino; 87 dev_t dev; 88 umode_t mode; 89 kuid_t uid; 90 kgid_t gid; 91 dev_t rdev; 92 u32 osid; 93 struct audit_cap_data fcap; 94 unsigned int fcap_ver; 95 unsigned char type; /* record type */ 96 /* 97 * This was an allocated audit_names and not from the array of 98 * names allocated in the task audit context. Thus this name 99 * should be freed on syscall exit. 100 */ 101 bool should_free; 102 }; 103 104 struct audit_proctitle { 105 int len; /* length of the cmdline field. */ 106 char *value; /* the cmdline field */ 107 }; 108 109 /* The per-task audit context. */ 110 struct audit_context { 111 int dummy; /* must be the first element */ 112 int in_syscall; /* 1 if task is in a syscall */ 113 enum audit_state state, current_state; 114 unsigned int serial; /* serial number for record */ 115 int major; /* syscall number */ 116 struct timespec64 ctime; /* time of syscall entry */ 117 unsigned long argv[4]; /* syscall arguments */ 118 long return_code;/* syscall return code */ 119 u64 prio; 120 int return_valid; /* return code is valid */ 121 /* 122 * The names_list is the list of all audit_names collected during this 123 * syscall. The first AUDIT_NAMES entries in the names_list will 124 * actually be from the preallocated_names array for performance 125 * reasons. Except during allocation they should never be referenced 126 * through the preallocated_names array and should only be found/used 127 * by running the names_list. 128 */ 129 struct audit_names preallocated_names[AUDIT_NAMES]; 130 int name_count; /* total records in names_list */ 131 struct list_head names_list; /* struct audit_names->list anchor */ 132 char *filterkey; /* key for rule that triggered record */ 133 struct path pwd; 134 struct audit_aux_data *aux; 135 struct audit_aux_data *aux_pids; 136 struct sockaddr_storage *sockaddr; 137 size_t sockaddr_len; 138 /* Save things to print about task_struct */ 139 pid_t pid, ppid; 140 kuid_t uid, euid, suid, fsuid; 141 kgid_t gid, egid, sgid, fsgid; 142 unsigned long personality; 143 int arch; 144 145 pid_t target_pid; 146 kuid_t target_auid; 147 kuid_t target_uid; 148 unsigned int target_sessionid; 149 u32 target_sid; 150 char target_comm[TASK_COMM_LEN]; 151 152 struct audit_tree_refs *trees, *first_trees; 153 struct list_head killed_trees; 154 int tree_count; 155 156 int type; 157 union { 158 struct { 159 int nargs; 160 long args[6]; 161 } socketcall; 162 struct { 163 kuid_t uid; 164 kgid_t gid; 165 umode_t mode; 166 u32 osid; 167 int has_perm; 168 uid_t perm_uid; 169 gid_t perm_gid; 170 umode_t perm_mode; 171 unsigned long qbytes; 172 } ipc; 173 struct { 174 mqd_t mqdes; 175 struct mq_attr mqstat; 176 } mq_getsetattr; 177 struct { 178 mqd_t mqdes; 179 int sigev_signo; 180 } mq_notify; 181 struct { 182 mqd_t mqdes; 183 size_t msg_len; 184 unsigned int msg_prio; 185 struct timespec64 abs_timeout; 186 } mq_sendrecv; 187 struct { 188 int oflag; 189 umode_t mode; 190 struct mq_attr attr; 191 } mq_open; 192 struct { 193 pid_t pid; 194 struct audit_cap_data cap; 195 } capset; 196 struct { 197 int fd; 198 int flags; 199 } mmap; 200 struct { 201 int argc; 202 } execve; 203 struct { 204 char *name; 205 } module; 206 }; 207 int fds[2]; 208 struct audit_proctitle proctitle; 209 }; 210 211 extern bool audit_ever_enabled; 212 213 extern void audit_copy_inode(struct audit_names *name, 214 const struct dentry *dentry, 215 struct inode *inode); 216 extern void audit_log_cap(struct audit_buffer *ab, char *prefix, 217 kernel_cap_t *cap); 218 extern void audit_log_name(struct audit_context *context, 219 struct audit_names *n, const struct path *path, 220 int record_num, int *call_panic); 221 222 extern int auditd_test_task(struct task_struct *task); 223 224 #define AUDIT_INODE_BUCKETS 32 225 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 226 227 static inline int audit_hash_ino(u32 ino) 228 { 229 return (ino & (AUDIT_INODE_BUCKETS-1)); 230 } 231 232 /* Indicates that audit should log the full pathname. */ 233 #define AUDIT_NAME_FULL -1 234 235 extern int audit_match_class(int class, unsigned syscall); 236 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 237 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 238 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 239 extern int parent_len(const char *path); 240 extern int audit_compare_dname_path(const char *dname, const char *path, int plen); 241 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi, 242 const void *payload, int size); 243 extern void audit_panic(const char *message); 244 245 struct audit_netlink_list { 246 __u32 portid; 247 struct net *net; 248 struct sk_buff_head q; 249 }; 250 251 int audit_send_list(void *_dest); 252 253 extern int selinux_audit_rule_update(void); 254 255 extern struct mutex audit_filter_mutex; 256 extern int audit_del_rule(struct audit_entry *entry); 257 extern void audit_free_rule_rcu(struct rcu_head *head); 258 extern struct list_head audit_filter_list[]; 259 260 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 261 262 extern void audit_log_d_path_exe(struct audit_buffer *ab, 263 struct mm_struct *mm); 264 265 extern struct tty_struct *audit_get_tty(struct task_struct *tsk); 266 extern void audit_put_tty(struct tty_struct *tty); 267 268 /* audit watch functions */ 269 #ifdef CONFIG_AUDIT_WATCH 270 extern void audit_put_watch(struct audit_watch *watch); 271 extern void audit_get_watch(struct audit_watch *watch); 272 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op); 273 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 274 extern void audit_remove_watch_rule(struct audit_krule *krule); 275 extern char *audit_watch_path(struct audit_watch *watch); 276 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev); 277 278 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len); 279 extern char *audit_mark_path(struct audit_fsnotify_mark *mark); 280 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark); 281 extern void audit_remove_mark_rule(struct audit_krule *krule); 282 extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev); 283 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old); 284 extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark); 285 286 #else 287 #define audit_put_watch(w) {} 288 #define audit_get_watch(w) {} 289 #define audit_to_watch(k, p, l, o) (-EINVAL) 290 #define audit_add_watch(k, l) (-EINVAL) 291 #define audit_remove_watch_rule(k) BUG() 292 #define audit_watch_path(w) "" 293 #define audit_watch_compare(w, i, d) 0 294 295 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL)) 296 #define audit_mark_path(m) "" 297 #define audit_remove_mark(m) 298 #define audit_remove_mark_rule(k) 299 #define audit_mark_compare(m, i, d) 0 300 #define audit_exe_compare(t, m) (-EINVAL) 301 #define audit_dupe_exe(n, o) (-EINVAL) 302 #endif /* CONFIG_AUDIT_WATCH */ 303 304 #ifdef CONFIG_AUDIT_TREE 305 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode); 306 extern void audit_put_chunk(struct audit_chunk *chunk); 307 extern bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree); 308 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op); 309 extern int audit_add_tree_rule(struct audit_krule *rule); 310 extern int audit_remove_tree_rule(struct audit_krule *rule); 311 extern void audit_trim_trees(void); 312 extern int audit_tag_tree(char *old, char *new); 313 extern const char *audit_tree_path(struct audit_tree *tree); 314 extern void audit_put_tree(struct audit_tree *tree); 315 extern void audit_kill_trees(struct list_head *list); 316 #else 317 #define audit_remove_tree_rule(rule) BUG() 318 #define audit_add_tree_rule(rule) -EINVAL 319 #define audit_make_tree(rule, str, op) -EINVAL 320 #define audit_trim_trees() (void)0 321 #define audit_put_tree(tree) (void)0 322 #define audit_tag_tree(old, new) -EINVAL 323 #define audit_tree_path(rule) "" /* never called */ 324 #define audit_kill_trees(list) BUG() 325 #endif 326 327 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len); 328 329 extern pid_t audit_sig_pid; 330 extern kuid_t audit_sig_uid; 331 extern u32 audit_sig_sid; 332 333 extern int audit_filter(int msgtype, unsigned int listtype); 334 335 #ifdef CONFIG_AUDITSYSCALL 336 extern int audit_signal_info(int sig, struct task_struct *t); 337 extern void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx); 338 extern struct list_head *audit_killed_trees(void); 339 #else 340 #define audit_signal_info(s,t) AUDIT_DISABLED 341 #define audit_filter_inodes(t,c) AUDIT_DISABLED 342 #endif 343 344 extern void audit_ctl_lock(void); 345 extern void audit_ctl_unlock(void); 346