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
audit_hash_ino(u32 ino)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
