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
27 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
28 * for saving names from getname(). If we get more names we will allocate
29 * a name dynamically and also add those to the list anchored by names_list. */
30 #define AUDIT_NAMES 5
31
32 /* At task start time, the audit_state is set in the audit_context using
33 a per-task filter. At syscall entry, the audit_state is augmented by
34 the syscall filter. */
35 enum audit_state {
36 AUDIT_DISABLED, /* Do not create per-task audit_context.
37 * No syscall-specific audit records can
38 * be generated. */
39 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
40 * and fill it in at syscall
41 * entry time. This makes a full
42 * syscall record available if some
43 * other part of the kernel decides it
44 * should be recorded. */
45 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
46 * always fill it in at syscall entry
47 * time, and always write out the audit
48 * record at syscall exit time. */
49 };
50
51 /* Rule lists */
52 struct audit_watch;
53 struct audit_fsnotify_mark;
54 struct audit_tree;
55 struct audit_chunk;
56
57 struct audit_entry {
58 struct list_head list;
59 struct rcu_head rcu;
60 struct audit_krule rule;
61 };
62
63 struct audit_cap_data {
64 kernel_cap_t permitted;
65 kernel_cap_t inheritable;
66 union {
67 unsigned int fE; /* effective bit of file cap */
68 kernel_cap_t effective; /* effective set of process */
69 };
70 };
71
72 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
73 * the refcnt in the associated filename struct.
74 *
75 * Further, in fs/namei.c:path_lookup() we store the inode and device.
76 */
77 struct audit_names {
78 struct list_head list; /* audit_context->names_list */
79
80 struct filename *name;
81 int name_len; /* number of chars to log */
82 bool hidden; /* don't log this record */
83
84 unsigned long ino;
85 dev_t dev;
86 umode_t mode;
87 kuid_t uid;
88 kgid_t gid;
89 dev_t rdev;
90 u32 osid;
91 struct audit_cap_data fcap;
92 unsigned int fcap_ver;
93 unsigned char type; /* record type */
94 /*
95 * This was an allocated audit_names and not from the array of
96 * names allocated in the task audit context. Thus this name
97 * should be freed on syscall exit.
98 */
99 bool should_free;
100 };
101
102 struct audit_proctitle {
103 int len; /* length of the cmdline field. */
104 char *value; /* the cmdline field */
105 };
106
107 /* The per-task audit context. */
108 struct audit_context {
109 int dummy; /* must be the first element */
110 int in_syscall; /* 1 if task is in a syscall */
111 enum audit_state state, current_state;
112 unsigned int serial; /* serial number for record */
113 int major; /* syscall number */
114 struct timespec ctime; /* time of syscall entry */
115 unsigned long argv[4]; /* syscall arguments */
116 long return_code;/* syscall return code */
117 u64 prio;
118 int return_valid; /* return code is valid */
119 /*
120 * The names_list is the list of all audit_names collected during this
121 * syscall. The first AUDIT_NAMES entries in the names_list will
122 * actually be from the preallocated_names array for performance
123 * reasons. Except during allocation they should never be referenced
124 * through the preallocated_names array and should only be found/used
125 * by running the names_list.
126 */
127 struct audit_names preallocated_names[AUDIT_NAMES];
128 int name_count; /* total records in names_list */
129 struct list_head names_list; /* struct audit_names->list anchor */
130 char *filterkey; /* key for rule that triggered record */
131 struct path pwd;
132 struct audit_aux_data *aux;
133 struct audit_aux_data *aux_pids;
134 struct sockaddr_storage *sockaddr;
135 size_t sockaddr_len;
136 /* Save things to print about task_struct */
137 pid_t pid, ppid;
138 kuid_t uid, euid, suid, fsuid;
139 kgid_t gid, egid, sgid, fsgid;
140 unsigned long personality;
141 int arch;
142
143 pid_t target_pid;
144 kuid_t target_auid;
145 kuid_t target_uid;
146 unsigned int target_sessionid;
147 u32 target_sid;
148 char target_comm[TASK_COMM_LEN];
149
150 struct audit_tree_refs *trees, *first_trees;
151 struct list_head killed_trees;
152 int tree_count;
153
154 int type;
155 union {
156 struct {
157 int nargs;
158 long args[6];
159 } socketcall;
160 struct {
161 kuid_t uid;
162 kgid_t gid;
163 umode_t mode;
164 u32 osid;
165 int has_perm;
166 uid_t perm_uid;
167 gid_t perm_gid;
168 umode_t perm_mode;
169 unsigned long qbytes;
170 } ipc;
171 struct {
172 mqd_t mqdes;
173 struct mq_attr mqstat;
174 } mq_getsetattr;
175 struct {
176 mqd_t mqdes;
177 int sigev_signo;
178 } mq_notify;
179 struct {
180 mqd_t mqdes;
181 size_t msg_len;
182 unsigned int msg_prio;
183 struct timespec abs_timeout;
184 } mq_sendrecv;
185 struct {
186 int oflag;
187 umode_t mode;
188 struct mq_attr attr;
189 } mq_open;
190 struct {
191 pid_t pid;
192 struct audit_cap_data cap;
193 } capset;
194 struct {
195 int fd;
196 int flags;
197 } mmap;
198 struct {
199 int argc;
200 } execve;
201 };
202 int fds[2];
203 struct audit_proctitle proctitle;
204 };
205
206 extern u32 audit_ever_enabled;
207
208 extern void audit_copy_inode(struct audit_names *name,
209 const struct dentry *dentry,
210 const struct inode *inode);
211 extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
212 kernel_cap_t *cap);
213 extern void audit_log_name(struct audit_context *context,
214 struct audit_names *n, struct path *path,
215 int record_num, int *call_panic);
216
217 extern int audit_pid;
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 char *dname, const char *path, int plen);
236 extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type,
237 int done, int multi,
238 const void *payload, int size);
239 extern void audit_panic(const char *message);
240
241 struct audit_netlink_list {
242 __u32 portid;
243 struct net *net;
244 struct sk_buff_head q;
245 };
246
247 int audit_send_list(void *);
248
249 struct audit_net {
250 struct sock *nlsk;
251 };
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 *);
257 extern void audit_free_rule_rcu(struct rcu_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 /* audit watch functions */
266 #ifdef CONFIG_AUDIT_WATCH
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, u32 op);
270 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
271 extern void audit_remove_watch_rule(struct audit_krule *krule);
272 extern char *audit_watch_path(struct audit_watch *watch);
273 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
274
275 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len);
276 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
277 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
278 extern void audit_remove_mark_rule(struct audit_krule *krule);
279 extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev);
280 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
281 extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark);
282
283 #else
284 #define audit_put_watch(w) {}
285 #define audit_get_watch(w) {}
286 #define audit_to_watch(k, p, l, o) (-EINVAL)
287 #define audit_add_watch(k, l) (-EINVAL)
288 #define audit_remove_watch_rule(k) BUG()
289 #define audit_watch_path(w) ""
290 #define audit_watch_compare(w, i, d) 0
291
292 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
293 #define audit_mark_path(m) ""
294 #define audit_remove_mark(m)
295 #define audit_remove_mark_rule(k)
296 #define audit_mark_compare(m, i, d) 0
297 #define audit_exe_compare(t, m) (-EINVAL)
298 #define audit_dupe_exe(n, o) (-EINVAL)
299 #endif /* CONFIG_AUDIT_WATCH */
300
301 #ifdef CONFIG_AUDIT_TREE
302 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
303 extern void audit_put_chunk(struct audit_chunk *);
304 extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *);
305 extern int audit_make_tree(struct audit_krule *, char *, u32);
306 extern int audit_add_tree_rule(struct audit_krule *);
307 extern int audit_remove_tree_rule(struct audit_krule *);
308 extern void audit_trim_trees(void);
309 extern int audit_tag_tree(char *old, char *new);
310 extern const char *audit_tree_path(struct audit_tree *);
311 extern void audit_put_tree(struct audit_tree *);
312 extern void audit_kill_trees(struct list_head *);
313 #else
314 #define audit_remove_tree_rule(rule) BUG()
315 #define audit_add_tree_rule(rule) -EINVAL
316 #define audit_make_tree(rule, str, op) -EINVAL
317 #define audit_trim_trees() (void)0
318 #define audit_put_tree(tree) (void)0
319 #define audit_tag_tree(old, new) -EINVAL
320 #define audit_tree_path(rule) "" /* never called */
321 #define audit_kill_trees(list) BUG()
322 #endif
323
324 extern char *audit_unpack_string(void **, size_t *, size_t);
325
326 extern pid_t audit_sig_pid;
327 extern kuid_t audit_sig_uid;
328 extern u32 audit_sig_sid;
329
330 #ifdef CONFIG_AUDITSYSCALL
331 extern int __audit_signal_info(int sig, struct task_struct *t);
audit_signal_info(int sig,struct task_struct * t)332 static inline int audit_signal_info(int sig, struct task_struct *t)
333 {
334 if (unlikely((audit_pid && t->tgid == audit_pid) ||
335 (audit_signals && !audit_dummy_context())))
336 return __audit_signal_info(sig, t);
337 return 0;
338 }
339 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
340 extern struct list_head *audit_killed_trees(void);
341 #else
342 #define audit_signal_info(s,t) AUDIT_DISABLED
343 #define audit_filter_inodes(t,c) AUDIT_DISABLED
344 #endif
345
346 extern struct mutex audit_cmd_mutex;
347