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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
fe7752ba DW |
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 | |
fe7752ba DW |
7 | */ |
8 | ||
9 | #include <linux/fs.h> | |
10 | #include <linux/audit.h> | |
9044e6bc | 11 | #include <linux/skbuff.h> |
ab9c17a8 | 12 | #include <linux/security.h> |
b24a30a7 | 13 | #include <uapi/linux/mqueue.h> |
3f5be2da | 14 | #include <linux/tty.h> |
fe7752ba | 15 | |
b24a30a7 EP |
16 | /* AUDIT_NAMES is the number of slots we reserve in the audit_context |
17 | * for saving names from getname(). If we get more names we will allocate | |
18 | * a name dynamically and also add those to the list anchored by names_list. */ | |
19 | #define AUDIT_NAMES 5 | |
20 | ||
fe7752ba DW |
21 | /* At task start time, the audit_state is set in the audit_context using |
22 | a per-task filter. At syscall entry, the audit_state is augmented by | |
23 | the syscall filter. */ | |
24 | enum audit_state { | |
25 | AUDIT_DISABLED, /* Do not create per-task audit_context. | |
26 | * No syscall-specific audit records can | |
27 | * be generated. */ | |
fe7752ba | 28 | AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context, |
997f5b64 | 29 | * and fill it in at syscall |
fe7752ba DW |
30 | * entry time. This makes a full |
31 | * syscall record available if some | |
32 | * other part of the kernel decides it | |
33 | * should be recorded. */ | |
34 | AUDIT_RECORD_CONTEXT /* Create the per-task audit_context, | |
35 | * always fill it in at syscall entry | |
36 | * time, and always write out the audit | |
37 | * record at syscall exit time. */ | |
38 | }; | |
39 | ||
40 | /* Rule lists */ | |
cfcad62c | 41 | struct audit_watch; |
7f492942 | 42 | struct audit_fsnotify_mark; |
74c3cbe3 AV |
43 | struct audit_tree; |
44 | struct audit_chunk; | |
45 | ||
fe7752ba | 46 | struct audit_entry { |
93315ed6 AG |
47 | struct list_head list; |
48 | struct rcu_head rcu; | |
49 | struct audit_krule rule; | |
fe7752ba DW |
50 | }; |
51 | ||
b24a30a7 EP |
52 | struct audit_cap_data { |
53 | kernel_cap_t permitted; | |
54 | kernel_cap_t inheritable; | |
55 | union { | |
56 | unsigned int fE; /* effective bit of file cap */ | |
57 | kernel_cap_t effective; /* effective set of process */ | |
58 | }; | |
7786f6b6 | 59 | kernel_cap_t ambient; |
2fec30e2 | 60 | kuid_t rootid; |
b24a30a7 EP |
61 | }; |
62 | ||
55422d0b PM |
63 | /* When fs/namei.c:getname() is called, we store the pointer in name and bump |
64 | * the refcnt in the associated filename struct. | |
b24a30a7 EP |
65 | * |
66 | * Further, in fs/namei.c:path_lookup() we store the inode and device. | |
67 | */ | |
68 | struct audit_names { | |
69 | struct list_head list; /* audit_context->names_list */ | |
70 | ||
71 | struct filename *name; | |
72 | int name_len; /* number of chars to log */ | |
79f6530c | 73 | bool hidden; /* don't log this record */ |
b24a30a7 EP |
74 | |
75 | unsigned long ino; | |
76 | dev_t dev; | |
77 | umode_t mode; | |
78 | kuid_t uid; | |
79 | kgid_t gid; | |
80 | dev_t rdev; | |
b2f933b2 | 81 | struct lsmblob oblob; |
b24a30a7 EP |
82 | struct audit_cap_data fcap; |
83 | unsigned int fcap_ver; | |
84 | unsigned char type; /* record type */ | |
85 | /* | |
86 | * This was an allocated audit_names and not from the array of | |
87 | * names allocated in the task audit context. Thus this name | |
88 | * should be freed on syscall exit. | |
89 | */ | |
90 | bool should_free; | |
91 | }; | |
92 | ||
3f1c8250 WR |
93 | struct audit_proctitle { |
94 | int len; /* length of the cmdline field. */ | |
95 | char *value; /* the cmdline field */ | |
96 | }; | |
97 | ||
b24a30a7 EP |
98 | /* The per-task audit context. */ |
99 | struct audit_context { | |
100 | int dummy; /* must be the first element */ | |
101 | int in_syscall; /* 1 if task is in a syscall */ | |
102 | enum audit_state state, current_state; | |
103 | unsigned int serial; /* serial number for record */ | |
104 | int major; /* syscall number */ | |
2115bb25 | 105 | struct timespec64 ctime; /* time of syscall entry */ |
b24a30a7 EP |
106 | unsigned long argv[4]; /* syscall arguments */ |
107 | long return_code;/* syscall return code */ | |
108 | u64 prio; | |
109 | int return_valid; /* return code is valid */ | |
110 | /* | |
111 | * The names_list is the list of all audit_names collected during this | |
112 | * syscall. The first AUDIT_NAMES entries in the names_list will | |
113 | * actually be from the preallocated_names array for performance | |
114 | * reasons. Except during allocation they should never be referenced | |
115 | * through the preallocated_names array and should only be found/used | |
116 | * by running the names_list. | |
117 | */ | |
118 | struct audit_names preallocated_names[AUDIT_NAMES]; | |
119 | int name_count; /* total records in names_list */ | |
120 | struct list_head names_list; /* struct audit_names->list anchor */ | |
121 | char *filterkey; /* key for rule that triggered record */ | |
122 | struct path pwd; | |
123 | struct audit_aux_data *aux; | |
124 | struct audit_aux_data *aux_pids; | |
125 | struct sockaddr_storage *sockaddr; | |
126 | size_t sockaddr_len; | |
127 | /* Save things to print about task_struct */ | |
128 | pid_t pid, ppid; | |
129 | kuid_t uid, euid, suid, fsuid; | |
130 | kgid_t gid, egid, sgid, fsgid; | |
131 | unsigned long personality; | |
132 | int arch; | |
133 | ||
134 | pid_t target_pid; | |
135 | kuid_t target_auid; | |
136 | kuid_t target_uid; | |
137 | unsigned int target_sessionid; | |
ab9c17a8 | 138 | struct lsmblob target_lsm; |
b24a30a7 EP |
139 | char target_comm[TASK_COMM_LEN]; |
140 | ||
141 | struct audit_tree_refs *trees, *first_trees; | |
142 | struct list_head killed_trees; | |
143 | int tree_count; | |
144 | ||
145 | int type; | |
146 | union { | |
147 | struct { | |
148 | int nargs; | |
149 | long args[6]; | |
150 | } socketcall; | |
151 | struct { | |
152 | kuid_t uid; | |
153 | kgid_t gid; | |
154 | umode_t mode; | |
b2f933b2 | 155 | struct lsmblob oblob; |
b24a30a7 EP |
156 | int has_perm; |
157 | uid_t perm_uid; | |
158 | gid_t perm_gid; | |
159 | umode_t perm_mode; | |
160 | unsigned long qbytes; | |
161 | } ipc; | |
162 | struct { | |
163 | mqd_t mqdes; | |
164 | struct mq_attr mqstat; | |
165 | } mq_getsetattr; | |
166 | struct { | |
167 | mqd_t mqdes; | |
168 | int sigev_signo; | |
169 | } mq_notify; | |
170 | struct { | |
171 | mqd_t mqdes; | |
172 | size_t msg_len; | |
173 | unsigned int msg_prio; | |
b9047726 | 174 | struct timespec64 abs_timeout; |
b24a30a7 EP |
175 | } mq_sendrecv; |
176 | struct { | |
177 | int oflag; | |
178 | umode_t mode; | |
179 | struct mq_attr attr; | |
180 | } mq_open; | |
181 | struct { | |
182 | pid_t pid; | |
183 | struct audit_cap_data cap; | |
184 | } capset; | |
185 | struct { | |
186 | int fd; | |
187 | int flags; | |
188 | } mmap; | |
d9cfea91 RGB |
189 | struct { |
190 | int argc; | |
d9cfea91 | 191 | } execve; |
ca86cad7 RGB |
192 | struct { |
193 | char *name; | |
194 | } module; | |
b24a30a7 EP |
195 | }; |
196 | int fds[2]; | |
3f1c8250 | 197 | struct audit_proctitle proctitle; |
b24a30a7 EP |
198 | }; |
199 | ||
b3b4fdf6 | 200 | extern bool audit_ever_enabled; |
c782f242 | 201 | |
0fe3c7fc RGB |
202 | extern void audit_log_session_info(struct audit_buffer *ab); |
203 | ||
b6c7c115 | 204 | extern int auditd_test_task(struct task_struct *task); |
fe7752ba | 205 | |
f368c07d AG |
206 | #define AUDIT_INODE_BUCKETS 32 |
207 | extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; | |
208 | ||
209 | static inline int audit_hash_ino(u32 ino) | |
210 | { | |
211 | return (ino & (AUDIT_INODE_BUCKETS-1)); | |
212 | } | |
213 | ||
e3d6b07b JL |
214 | /* Indicates that audit should log the full pathname. */ |
215 | #define AUDIT_NAME_FULL -1 | |
216 | ||
55669bfa | 217 | extern int audit_match_class(int class, unsigned syscall); |
f368c07d | 218 | extern int audit_comparator(const u32 left, const u32 op, const u32 right); |
ca57ec0f EB |
219 | extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right); |
220 | extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right); | |
bfcec708 | 221 | extern int parent_len(const char *path); |
795d673a | 222 | extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen); |
45a0642b | 223 | extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi, |
f9441639 | 224 | const void *payload, int size); |
fe7752ba | 225 | extern void audit_panic(const char *message); |
3dc7e315 | 226 | |
9044e6bc | 227 | struct audit_netlink_list { |
f9441639 | 228 | __u32 portid; |
638a0fd2 | 229 | struct net *net; |
9044e6bc AV |
230 | struct sk_buff_head q; |
231 | }; | |
232 | ||
3054d067 | 233 | int audit_send_list_thread(void *_dest); |
9044e6bc | 234 | |
3dc7e315 | 235 | extern int selinux_audit_rule_update(void); |
e1396065 | 236 | |
74c3cbe3 | 237 | extern struct mutex audit_filter_mutex; |
e4c1a0d1 DR |
238 | extern int audit_del_rule(struct audit_entry *entry); |
239 | extern void audit_free_rule_rcu(struct rcu_head *head); | |
c782f242 | 240 | extern struct list_head audit_filter_list[]; |
74c3cbe3 | 241 | |
939a67fc EP |
242 | extern struct audit_entry *audit_dupe_rule(struct audit_krule *old); |
243 | ||
4766b199 DB |
244 | extern void audit_log_d_path_exe(struct audit_buffer *ab, |
245 | struct mm_struct *mm); | |
246 | ||
2a1fe215 | 247 | extern struct tty_struct *audit_get_tty(void); |
3f5be2da RGB |
248 | extern void audit_put_tty(struct tty_struct *tty); |
249 | ||
05c7a9cb | 250 | /* audit watch/mark/tree functions */ |
c8fc5d49 | 251 | #ifdef CONFIG_AUDITSYSCALL |
cd108b5c RGB |
252 | extern unsigned int audit_serial(void); |
253 | extern int auditsc_get_stamp(struct audit_context *ctx, | |
254 | struct timespec64 *t, unsigned int *serial); | |
255 | ||
cfcad62c EP |
256 | extern void audit_put_watch(struct audit_watch *watch); |
257 | extern void audit_get_watch(struct audit_watch *watch); | |
05c7a9cb RGB |
258 | extern int audit_to_watch(struct audit_krule *krule, char *path, int len, |
259 | u32 op); | |
ae7b8f41 | 260 | extern int audit_add_watch(struct audit_krule *krule, struct list_head **list); |
a05fb6cc | 261 | extern void audit_remove_watch_rule(struct audit_krule *krule); |
cfcad62c | 262 | extern char *audit_watch_path(struct audit_watch *watch); |
05c7a9cb RGB |
263 | extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, |
264 | dev_t dev); | |
7f492942 | 265 | |
05c7a9cb RGB |
266 | extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, |
267 | char *pathname, int len); | |
7f492942 RGB |
268 | extern char *audit_mark_path(struct audit_fsnotify_mark *mark); |
269 | extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark); | |
270 | extern void audit_remove_mark_rule(struct audit_krule *krule); | |
05c7a9cb RGB |
271 | extern int audit_mark_compare(struct audit_fsnotify_mark *mark, |
272 | unsigned long ino, dev_t dev); | |
34d99af5 | 273 | extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old); |
05c7a9cb RGB |
274 | extern int audit_exe_compare(struct task_struct *tsk, |
275 | struct audit_fsnotify_mark *mark); | |
7f492942 | 276 | |
05c7a9cb RGB |
277 | extern struct audit_chunk *audit_tree_lookup(const struct inode *inode); |
278 | extern void audit_put_chunk(struct audit_chunk *chunk); | |
279 | extern bool audit_tree_match(struct audit_chunk *chunk, | |
280 | struct audit_tree *tree); | |
281 | extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op); | |
282 | extern int audit_add_tree_rule(struct audit_krule *rule); | |
283 | extern int audit_remove_tree_rule(struct audit_krule *rule); | |
284 | extern void audit_trim_trees(void); | |
285 | extern int audit_tag_tree(char *old, char *new); | |
286 | extern const char *audit_tree_path(struct audit_tree *tree); | |
287 | extern void audit_put_tree(struct audit_tree *tree); | |
288 | extern void audit_kill_trees(struct audit_context *context); | |
289 | ||
b48345aa | 290 | extern int audit_signal_info_syscall(struct task_struct *t); |
05c7a9cb RGB |
291 | extern void audit_filter_inodes(struct task_struct *tsk, |
292 | struct audit_context *ctx); | |
293 | extern struct list_head *audit_killed_trees(void); | |
294 | #else /* CONFIG_AUDITSYSCALL */ | |
cd108b5c | 295 | #define auditsc_get_stamp(c, t, s) 0 |
939a67fc EP |
296 | #define audit_put_watch(w) {} |
297 | #define audit_get_watch(w) {} | |
298 | #define audit_to_watch(k, p, l, o) (-EINVAL) | |
299 | #define audit_add_watch(k, l) (-EINVAL) | |
300 | #define audit_remove_watch_rule(k) BUG() | |
301 | #define audit_watch_path(w) "" | |
302 | #define audit_watch_compare(w, i, d) 0 | |
303 | ||
7f492942 RGB |
304 | #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL)) |
305 | #define audit_mark_path(m) "" | |
306 | #define audit_remove_mark(m) | |
307 | #define audit_remove_mark_rule(k) | |
308 | #define audit_mark_compare(m, i, d) 0 | |
34d99af5 RGB |
309 | #define audit_exe_compare(t, m) (-EINVAL) |
310 | #define audit_dupe_exe(n, o) (-EINVAL) | |
cfcad62c | 311 | |
74c3cbe3 AV |
312 | #define audit_remove_tree_rule(rule) BUG() |
313 | #define audit_add_tree_rule(rule) -EINVAL | |
314 | #define audit_make_tree(rule, str, op) -EINVAL | |
315 | #define audit_trim_trees() (void)0 | |
316 | #define audit_put_tree(tree) (void)0 | |
317 | #define audit_tag_tree(old, new) -EINVAL | |
318 | #define audit_tree_path(rule) "" /* never called */ | |
9e36a5d4 | 319 | #define audit_kill_trees(context) BUG() |
05c7a9cb | 320 | |
b48345aa RGB |
321 | static inline int audit_signal_info_syscall(struct task_struct *t) |
322 | { | |
323 | return 0; | |
324 | } | |
325 | ||
05c7a9cb RGB |
326 | #define audit_filter_inodes(t, c) AUDIT_DISABLED |
327 | #endif /* CONFIG_AUDITSYSCALL */ | |
74c3cbe3 | 328 | |
e4c1a0d1 | 329 | extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len); |
74c3cbe3 | 330 | |
ab9c17a8 CS |
331 | extern struct lsmblob audit_sig_lsm; |
332 | ||
86b2efbe RGB |
333 | extern int audit_filter(int msgtype, unsigned int listtype); |
334 | ||
ce423631 PM |
335 | extern void audit_ctl_lock(void); |
336 | extern void audit_ctl_unlock(void); |