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 #ifndef _KERNEL_AUDIT_H_ 10 #define _KERNEL_AUDIT_H_ 11 12 #include <linux/fs.h> 13 #include <linux/audit.h> 14 #include <linux/skbuff.h> 15 #include <uapi/linux/mqueue.h> 16 #include <linux/tty.h> 17 #include <uapi/linux/openat2.h> // struct open_how 18 19 /* AUDIT_NAMES is the number of slots we reserve in the audit_context 20 * for saving names from getname(). If we get more names we will allocate 21 * a name dynamically and also add those to the list anchored by names_list. */ 22 #define AUDIT_NAMES 5 23 24 /* At task start time, the audit_state is set in the audit_context using 25 a per-task filter. At syscall entry, the audit_state is augmented by 26 the syscall filter. */ 27 enum audit_state { 28 AUDIT_STATE_DISABLED, /* Do not create per-task audit_context. 29 * No syscall-specific audit records can 30 * be generated. */ 31 AUDIT_STATE_BUILD, /* Create the per-task audit_context, 32 * and fill it in at syscall 33 * entry time. This makes a full 34 * syscall record available if some 35 * other part of the kernel decides it 36 * should be recorded. */ 37 AUDIT_STATE_RECORD /* Create the per-task audit_context, 38 * always fill it in at syscall entry 39 * time, and always write out the audit 40 * record at syscall exit time. */ 41 }; 42 43 /* Rule lists */ 44 struct audit_watch; 45 struct audit_fsnotify_mark; 46 struct audit_tree; 47 struct audit_chunk; 48 49 struct audit_entry { 50 struct list_head list; 51 struct rcu_head rcu; 52 struct audit_krule rule; 53 }; 54 55 struct audit_cap_data { 56 kernel_cap_t permitted; 57 kernel_cap_t inheritable; 58 union { 59 unsigned int fE; /* effective bit of file cap */ 60 kernel_cap_t effective; /* effective set of process */ 61 }; 62 kernel_cap_t ambient; 63 kuid_t rootid; 64 }; 65 66 /* When fs/namei.c:getname() is called, we store the pointer in name and bump 67 * the refcnt in the associated filename struct. 68 * 69 * Further, in fs/namei.c:path_lookup() we store the inode and device. 70 */ 71 struct audit_names { 72 struct list_head list; /* audit_context->names_list */ 73 74 struct filename *name; 75 int name_len; /* number of chars to log */ 76 bool hidden; /* don't log this record */ 77 78 unsigned long ino; 79 dev_t dev; 80 umode_t mode; 81 kuid_t uid; 82 kgid_t gid; 83 dev_t rdev; 84 u32 osid; 85 struct audit_cap_data fcap; 86 unsigned int fcap_ver; 87 unsigned char type; /* record type */ 88 /* 89 * This was an allocated audit_names and not from the array of 90 * names allocated in the task audit context. Thus this name 91 * should be freed on syscall exit. 92 */ 93 bool should_free; 94 }; 95 96 struct audit_proctitle { 97 int len; /* length of the cmdline field. */ 98 char *value; /* the cmdline field */ 99 }; 100 101 /* The per-task audit context. */ 102 struct audit_context { 103 int dummy; /* must be the first element */ 104 enum { 105 AUDIT_CTX_UNUSED, /* audit_context is currently unused */ 106 AUDIT_CTX_SYSCALL, /* in use by syscall */ 107 AUDIT_CTX_URING, /* in use by io_uring */ 108 } context; 109 enum audit_state state, current_state; 110 unsigned int serial; /* serial number for record */ 111 int major; /* syscall number */ 112 int uring_op; /* uring operation */ 113 struct timespec64 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 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 timespec64 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 open_how openat2; 198 struct { 199 int argc; 200 } execve; 201 struct { 202 char *name; 203 } module; 204 struct { 205 struct audit_ntp_data ntp_data; 206 struct timespec64 tk_injoffset; 207 } time; 208 }; 209 int fds[2]; 210 struct audit_proctitle proctitle; 211 }; 212 213 extern bool audit_ever_enabled; 214 215 extern void audit_log_session_info(struct audit_buffer *ab); 216 217 extern int auditd_test_task(struct task_struct *task); 218 219 #define AUDIT_INODE_BUCKETS 32 220 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 221 audit_hash_ino(u32 ino)222 static inline int audit_hash_ino(u32 ino) 223 { 224 return (ino & (AUDIT_INODE_BUCKETS-1)); 225 } 226 227 /* Indicates that audit should log the full pathname. */ 228 #define AUDIT_NAME_FULL -1 229 230 extern int audit_match_class(int class, unsigned syscall); 231 extern int audit_comparator(const u32 left, const u32 op, const u32 right); 232 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); 233 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); 234 extern int parent_len(const char *path); 235 extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen); 236 extern struct sk_buff *audit_make_reply(int seq, int type, 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_thread(void *_dest); 247 248 extern struct mutex audit_filter_mutex; 249 extern int audit_del_rule(struct audit_entry *entry); 250 extern void audit_free_rule_rcu(struct rcu_head *head); 251 extern struct list_head audit_filter_list[]; 252 253 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); 254 255 extern void audit_log_d_path_exe(struct audit_buffer *ab, 256 struct mm_struct *mm); 257 258 extern struct tty_struct *audit_get_tty(void); 259 extern void audit_put_tty(struct tty_struct *tty); 260 261 /* audit watch/mark/tree functions */ 262 extern unsigned int audit_serial(void); 263 #ifdef CONFIG_AUDITSYSCALL 264 extern int auditsc_get_stamp(struct audit_context *ctx, 265 struct timespec64 *t, unsigned int *serial); 266 267 extern void audit_put_watch(struct audit_watch *watch); 268 extern void audit_get_watch(struct audit_watch *watch); 269 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, 270 u32 op); 271 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); 272 extern void audit_remove_watch_rule(struct audit_krule *krule); 273 extern char *audit_watch_path(struct audit_watch *watch); 274 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, 275 dev_t dev); 276 277 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, 278 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, 283 unsigned long ino, dev_t dev); 284 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old); 285 extern int audit_exe_compare(struct task_struct *tsk, 286 struct audit_fsnotify_mark *mark); 287 288 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode); 289 extern void audit_put_chunk(struct audit_chunk *chunk); 290 extern bool audit_tree_match(struct audit_chunk *chunk, 291 struct audit_tree *tree); 292 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op); 293 extern int audit_add_tree_rule(struct audit_krule *rule); 294 extern int audit_remove_tree_rule(struct audit_krule *rule); 295 extern void audit_trim_trees(void); 296 extern int audit_tag_tree(char *old, char *new); 297 extern const char *audit_tree_path(struct audit_tree *tree); 298 extern void audit_put_tree(struct audit_tree *tree); 299 extern void audit_kill_trees(struct audit_context *context); 300 301 extern int audit_signal_info_syscall(struct task_struct *t); 302 extern void audit_filter_inodes(struct task_struct *tsk, 303 struct audit_context *ctx); 304 extern struct list_head *audit_killed_trees(void); 305 #else /* CONFIG_AUDITSYSCALL */ 306 #define auditsc_get_stamp(c, t, s) 0 307 #define audit_put_watch(w) do { } while (0) 308 #define audit_get_watch(w) do { } while (0) 309 #define audit_to_watch(k, p, l, o) (-EINVAL) 310 #define audit_add_watch(k, l) (-EINVAL) 311 #define audit_remove_watch_rule(k) BUG() 312 #define audit_watch_path(w) "" 313 #define audit_watch_compare(w, i, d) 0 314 315 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL)) 316 #define audit_mark_path(m) "" 317 #define audit_remove_mark(m) do { } while (0) 318 #define audit_remove_mark_rule(k) do { } while (0) 319 #define audit_mark_compare(m, i, d) 0 320 #define audit_exe_compare(t, m) (-EINVAL) 321 #define audit_dupe_exe(n, o) (-EINVAL) 322 323 #define audit_remove_tree_rule(rule) BUG() 324 #define audit_add_tree_rule(rule) -EINVAL 325 #define audit_make_tree(rule, str, op) -EINVAL 326 #define audit_trim_trees() do { } while (0) 327 #define audit_put_tree(tree) do { } while (0) 328 #define audit_tag_tree(old, new) -EINVAL 329 #define audit_tree_path(rule) "" /* never called */ 330 #define audit_kill_trees(context) BUG() 331 audit_signal_info_syscall(struct task_struct * t)332 static inline int audit_signal_info_syscall(struct task_struct *t) 333 { 334 return 0; 335 } 336 337 #define audit_filter_inodes(t, c) do { } while (0) 338 #endif /* CONFIG_AUDITSYSCALL */ 339 340 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len); 341 342 extern int audit_filter(int msgtype, unsigned int listtype); 343 344 extern void audit_ctl_lock(void); 345 extern void audit_ctl_unlock(void); 346 347 #endif 348