1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* audit -- definition of audit_context structure and supporting types 3 * 4 * Copyright 2003-2004 Red Hat, Inc. 5 * Copyright 2005 Hewlett-Packard Development Company, L.P. 6 * Copyright 2005 IBM Corporation 7 */ 8 9 #include <linux/fs.h> 10 #include <linux/audit.h> 11 #include <linux/skbuff.h> 12 #include <uapi/linux/mqueue.h> 13 #include <linux/tty.h> 14 15 /* AUDIT_NAMES is the number of slots we reserve in the audit_context 16 * for saving names from getname(). If we get more names we will allocate 17 * a name dynamically and also add those to the list anchored by names_list. */ 18 #define AUDIT_NAMES 5 19 20 /* At task start time, the audit_state is set in the audit_context using 21 a per-task filter. At syscall entry, the audit_state is augmented by 22 the syscall filter. */ 23 enum audit_state { 24 AUDIT_DISABLED, /* Do not create per-task audit_context. 25 * No syscall-specific audit records can 26 * be generated. */ 27 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, 28 * and fill it in at syscall 29 * entry time. This makes a full 30 * syscall record available if some 31 * other part of the kernel decides it 32 * should be recorded. */ 33 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, 34 * always fill it in at syscall entry 35 * time, and always write out the audit 36 * record at syscall exit time. */ 37 }; 38 39 /* Rule lists */ 40 struct audit_watch; 41 struct audit_fsnotify_mark; 42 struct audit_tree; 43 struct audit_chunk; 44 45 struct audit_entry { 46 struct list_head list; 47 struct rcu_head rcu; 48 struct audit_krule rule; 49 }; 50 51 struct audit_cap_data { 52 kernel_cap_t permitted; 53 kernel_cap_t inheritable; 54 union { 55 unsigned int fE; /* effective bit of file cap */ 56 kernel_cap_t effective; /* effective set of process */ 57 }; 58 kernel_cap_t ambient; 59 kuid_t rootid; 60 }; 61 62 /* When fs/namei.c:getname() is called, we store the pointer in name and bump 63 * the refcnt in the associated filename struct. 64 * 65 * Further, in fs/namei.c:path_lookup() we store the inode and device. 66 */ 67 struct audit_names { 68 struct list_head list; /* audit_context->names_list */ 69 70 struct filename *name; 71 int name_len; /* number of chars to log */ 72 bool hidden; /* don't log this record */ 73 74 unsigned long ino; 75 dev_t dev; 76 umode_t mode; 77 kuid_t uid; 78 kgid_t gid; 79 dev_t rdev; 80 u32 osid; 81 struct audit_cap_data fcap; 82 unsigned int fcap_ver; 83 unsigned char type; /* record type */ 84 /* 85 * This was an allocated audit_names and not from the array of 86 * names allocated in the task audit context. Thus this name 87 * should be freed on syscall exit. 88 */ 89 bool should_free; 90 }; 91 92 struct audit_proctitle { 93 int len; /* length of the cmdline field. */ 94 char *value; /* the cmdline field */ 95 }; 96 97 /* The per-task audit context. */ 98 struct audit_context { 99 int dummy; /* must be the first element */ 100 int in_syscall; /* 1 if task is in a syscall */ 101 enum audit_state state, current_state; 102 unsigned int serial; /* serial number for record */ 103 int major; /* syscall number */ 104 struct timespec64 ctime; /* time of syscall entry */ 105 unsigned long argv[4]; /* syscall arguments */ 106 long return_code;/* syscall return code */ 107 u64 prio; 108 int return_valid; /* return code is valid */ 109 /* 110 * The names_list is the list of all audit_names collected during this 111 * syscall. The first AUDIT_NAMES entries in the names_list will 112 * actually be from the preallocated_names array for performance 113 * reasons. Except during allocation they should never be referenced 114 * through the preallocated_names array and should only be found/used 115 * by running the names_list. 116 */ 117 struct audit_names preallocated_names[AUDIT_NAMES]; 118 int name_count; /* total records in names_list */ 119 struct list_head names_list; /* struct audit_names->list anchor */ 120 char *filterkey; /* key for rule that triggered record */ 121 struct path pwd; 122 struct audit_aux_data *aux; 123 struct audit_aux_data *aux_pids; 124 struct sockaddr_storage *sockaddr; 125 size_t sockaddr_len; 126 /* Save things to print about task_struct */ 127 pid_t pid, ppid; 128 kuid_t uid, euid, suid, fsuid; 129 kgid_t gid, egid, sgid, fsgid; 130 unsigned long personality; 131 int arch; 132 133 pid_t target_pid; 134 kuid_t target_auid; 135 kuid_t target_uid; 136 unsigned int target_sessionid; 137 u32 target_sid; 138 char target_comm[TASK_COMM_LEN]; 139 140 struct audit_tree_refs *trees, *first_trees; 141 struct list_head killed_trees; 142 int tree_count; 143 144 int type; 145 union { 146 struct { 147 int nargs; 148 long args[6]; 149 } socketcall; 150 struct { 151 kuid_t uid; 152 kgid_t gid; 153 umode_t mode; 154 u32 osid; 155 int has_perm; 156 uid_t perm_uid; 157 gid_t perm_gid; 158 umode_t perm_mode; 159 unsigned long qbytes; 160 } ipc; 161 struct { 162 mqd_t mqdes; 163 struct mq_attr mqstat; 164 } mq_getsetattr; 165 struct { 166 mqd_t mqdes; 167 int sigev_signo; 168 } mq_notify; 169 struct { 170 mqd_t mqdes; 171 size_t msg_len; 172 unsigned int msg_prio; 173 struct timespec64 abs_timeout; 174 } mq_sendrecv; 175 struct { 176 int oflag; 177 umode_t mode; 178 struct mq_attr attr; 179 } mq_open; 180 struct { 181 pid_t pid; 182 struct audit_cap_data cap; 183 } capset; 184 struct { 185 int fd; 186 int flags; 187 } mmap; 188 struct { 189 int argc; 190 } execve; 191 struct { 192 char *name; 193 } module; 194 }; 195 int fds[2]; 196 struct audit_proctitle proctitle; 197 }; 198 199 extern bool audit_ever_enabled; 200 201 extern void audit_log_session_info(struct audit_buffer *ab); 202 203 extern int auditd_test_task(struct task_struct *task); 204 205 #define AUDIT_INODE_BUCKETS 32 206 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 207 208 static inline int audit_hash_ino(u32 ino) 209 { 210 return (ino & (AUDIT_INODE_BUCKETS-1)); 211 } 212 213 /* Indicates that audit should log the full pathname. */ 214 #define AUDIT_NAME_FULL -1 215 216 extern int audit_match_class(int class, unsigned syscall); 217 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 218 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 219 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 220 extern int parent_len(const char *path); 221 extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen); 222 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi, 223 const void *payload, int size); 224 extern void audit_panic(const char *message); 225 226 struct audit_netlink_list { 227 __u32 portid; 228 struct net *net; 229 struct sk_buff_head q; 230 }; 231 232 int audit_send_list_thread(void *_dest); 233 234 extern int selinux_audit_rule_update(void); 235 236 extern struct mutex audit_filter_mutex; 237 extern int audit_del_rule(struct audit_entry *entry); 238 extern void audit_free_rule_rcu(struct rcu_head *head); 239 extern struct list_head audit_filter_list[]; 240 241 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 242 243 extern void audit_log_d_path_exe(struct audit_buffer *ab, 244 struct mm_struct *mm); 245 246 extern struct tty_struct *audit_get_tty(void); 247 extern void audit_put_tty(struct tty_struct *tty); 248 249 /* audit watch/mark/tree functions */ 250 #ifdef CONFIG_AUDITSYSCALL 251 extern unsigned int audit_serial(void); 252 extern int auditsc_get_stamp(struct audit_context *ctx, 253 struct timespec64 *t, unsigned int *serial); 254 255 extern void audit_put_watch(struct audit_watch *watch); 256 extern void audit_get_watch(struct audit_watch *watch); 257 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, 258 u32 op); 259 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 260 extern void audit_remove_watch_rule(struct audit_krule *krule); 261 extern char *audit_watch_path(struct audit_watch *watch); 262 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, 263 dev_t dev); 264 265 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, 266 char *pathname, int len); 267 extern char *audit_mark_path(struct audit_fsnotify_mark *mark); 268 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark); 269 extern void audit_remove_mark_rule(struct audit_krule *krule); 270 extern int audit_mark_compare(struct audit_fsnotify_mark *mark, 271 unsigned long ino, dev_t dev); 272 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old); 273 extern int audit_exe_compare(struct task_struct *tsk, 274 struct audit_fsnotify_mark *mark); 275 276 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode); 277 extern void audit_put_chunk(struct audit_chunk *chunk); 278 extern bool audit_tree_match(struct audit_chunk *chunk, 279 struct audit_tree *tree); 280 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op); 281 extern int audit_add_tree_rule(struct audit_krule *rule); 282 extern int audit_remove_tree_rule(struct audit_krule *rule); 283 extern void audit_trim_trees(void); 284 extern int audit_tag_tree(char *old, char *new); 285 extern const char *audit_tree_path(struct audit_tree *tree); 286 extern void audit_put_tree(struct audit_tree *tree); 287 extern void audit_kill_trees(struct audit_context *context); 288 289 extern int audit_signal_info_syscall(struct task_struct *t); 290 extern void audit_filter_inodes(struct task_struct *tsk, 291 struct audit_context *ctx); 292 extern struct list_head *audit_killed_trees(void); 293 #else /* CONFIG_AUDITSYSCALL */ 294 #define auditsc_get_stamp(c, t, s) 0 295 #define audit_put_watch(w) {} 296 #define audit_get_watch(w) {} 297 #define audit_to_watch(k, p, l, o) (-EINVAL) 298 #define audit_add_watch(k, l) (-EINVAL) 299 #define audit_remove_watch_rule(k) BUG() 300 #define audit_watch_path(w) "" 301 #define audit_watch_compare(w, i, d) 0 302 303 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL)) 304 #define audit_mark_path(m) "" 305 #define audit_remove_mark(m) 306 #define audit_remove_mark_rule(k) 307 #define audit_mark_compare(m, i, d) 0 308 #define audit_exe_compare(t, m) (-EINVAL) 309 #define audit_dupe_exe(n, o) (-EINVAL) 310 311 #define audit_remove_tree_rule(rule) BUG() 312 #define audit_add_tree_rule(rule) -EINVAL 313 #define audit_make_tree(rule, str, op) -EINVAL 314 #define audit_trim_trees() (void)0 315 #define audit_put_tree(tree) (void)0 316 #define audit_tag_tree(old, new) -EINVAL 317 #define audit_tree_path(rule) "" /* never called */ 318 #define audit_kill_trees(context) BUG() 319 320 static inline int audit_signal_info_syscall(struct task_struct *t) 321 { 322 return 0; 323 } 324 325 #define audit_filter_inodes(t, c) AUDIT_DISABLED 326 #endif /* CONFIG_AUDITSYSCALL */ 327 328 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len); 329 330 extern int audit_filter(int msgtype, unsigned int listtype); 331 332 extern void audit_ctl_lock(void); 333 extern void audit_ctl_unlock(void); 334