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. */
36enum 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 */
53struct audit_watch;
54struct audit_fsnotify_mark;
55struct audit_tree;
56struct audit_chunk;
57
58struct audit_entry {
59 struct list_head list;
60 struct rcu_head rcu;
61 struct audit_krule rule;
62};
63
64struct 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 kuid_t rootid;
73};
74
75/* When fs/namei.c:getname() is called, we store the pointer in name and bump
76 * the refcnt in the associated filename struct.
77 *
78 * Further, in fs/namei.c:path_lookup() we store the inode and device.
79 */
80struct audit_names {
81 struct list_head list; /* audit_context->names_list */
82
83 struct filename *name;
84 int name_len; /* number of chars to log */
85 bool hidden; /* don't log this record */
86
87 unsigned long ino;
88 dev_t dev;
89 umode_t mode;
90 kuid_t uid;
91 kgid_t gid;
92 dev_t rdev;
93 u32 osid;
94 struct audit_cap_data fcap;
95 unsigned int fcap_ver;
96 unsigned char type; /* record type */
97 /*
98 * This was an allocated audit_names and not from the array of
99 * names allocated in the task audit context. Thus this name
100 * should be freed on syscall exit.
101 */
102 bool should_free;
103};
104
105struct audit_proctitle {
106 int len; /* length of the cmdline field. */
107 char *value; /* the cmdline field */
108};
109
110/* The per-task audit context. */
111struct audit_context {
112 int dummy; /* must be the first element */
113 int in_syscall; /* 1 if task is in a syscall */
114 enum audit_state state, current_state;
115 unsigned int serial; /* serial number for record */
116 int major; /* syscall number */
117 struct timespec64 ctime; /* time of syscall entry */
118 unsigned long argv[4]; /* syscall arguments */
119 long return_code;/* syscall return code */
120 u64 prio;
121 int return_valid; /* return code is valid */
122 /*
123 * The names_list is the list of all audit_names collected during this
124 * syscall. The first AUDIT_NAMES entries in the names_list will
125 * actually be from the preallocated_names array for performance
126 * reasons. Except during allocation they should never be referenced
127 * through the preallocated_names array and should only be found/used
128 * by running the names_list.
129 */
130 struct audit_names preallocated_names[AUDIT_NAMES];
131 int name_count; /* total records in names_list */
132 struct list_head names_list; /* struct audit_names->list anchor */
133 char *filterkey; /* key for rule that triggered record */
134 struct path pwd;
135 struct audit_aux_data *aux;
136 struct audit_aux_data *aux_pids;
137 struct sockaddr_storage *sockaddr;
138 size_t sockaddr_len;
139 /* Save things to print about task_struct */
140 pid_t pid, ppid;
141 kuid_t uid, euid, suid, fsuid;
142 kgid_t gid, egid, sgid, fsgid;
143 unsigned long personality;
144 int arch;
145
146 pid_t target_pid;
147 kuid_t target_auid;
148 kuid_t target_uid;
149 unsigned int target_sessionid;
150 u32 target_sid;
151 char target_comm[TASK_COMM_LEN];
152
153 struct audit_tree_refs *trees, *first_trees;
154 struct list_head killed_trees;
155 int tree_count;
156
157 int type;
158 union {
159 struct {
160 int nargs;
161 long args[6];
162 } socketcall;
163 struct {
164 kuid_t uid;
165 kgid_t gid;
166 umode_t mode;
167 u32 osid;
168 int has_perm;
169 uid_t perm_uid;
170 gid_t perm_gid;
171 umode_t perm_mode;
172 unsigned long qbytes;
173 } ipc;
174 struct {
175 mqd_t mqdes;
176 struct mq_attr mqstat;
177 } mq_getsetattr;
178 struct {
179 mqd_t mqdes;
180 int sigev_signo;
181 } mq_notify;
182 struct {
183 mqd_t mqdes;
184 size_t msg_len;
185 unsigned int msg_prio;
186 struct timespec64 abs_timeout;
187 } mq_sendrecv;
188 struct {
189 int oflag;
190 umode_t mode;
191 struct mq_attr attr;
192 } mq_open;
193 struct {
194 pid_t pid;
195 struct audit_cap_data cap;
196 } capset;
197 struct {
198 int fd;
199 int flags;
200 } mmap;
201 struct {
202 int argc;
203 } execve;
204 struct {
205 char *name;
206 } module;
207 };
208 int fds[2];
209 struct audit_proctitle proctitle;
210};
211
212extern bool audit_ever_enabled;
213
214extern void audit_log_session_info(struct audit_buffer *ab);
215
216extern int auditd_test_task(struct task_struct *task);
217
218#define AUDIT_INODE_BUCKETS 32
219extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
220
221static inline int audit_hash_ino(u32 ino)
222{
223 return (ino & (AUDIT_INODE_BUCKETS-1));
224}
225
226/* Indicates that audit should log the full pathname. */
227#define AUDIT_NAME_FULL -1
228
229extern int audit_match_class(int class, unsigned syscall);
230extern int audit_comparator(const u32 left, const u32 op, const u32 right);
231extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
232extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
233extern int parent_len(const char *path);
234extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
235extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
236 const void *payload, int size);
237extern void audit_panic(const char *message);
238
239struct audit_netlink_list {
240 __u32 portid;
241 struct net *net;
242 struct sk_buff_head q;
243};
244
245int audit_send_list(void *_dest);
246
247extern int selinux_audit_rule_update(void);
248
249extern struct mutex audit_filter_mutex;
250extern int audit_del_rule(struct audit_entry *entry);
251extern void audit_free_rule_rcu(struct rcu_head *head);
252extern struct list_head audit_filter_list[];
253
254extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
255
256extern void audit_log_d_path_exe(struct audit_buffer *ab,
257 struct mm_struct *mm);
258
259extern struct tty_struct *audit_get_tty(void);
260extern void audit_put_tty(struct tty_struct *tty);
261
262/* audit watch/mark/tree functions */
263#ifdef CONFIG_AUDITSYSCALL
264extern unsigned int audit_serial(void);
265extern int auditsc_get_stamp(struct audit_context *ctx,
266 struct timespec64 *t, unsigned int *serial);
267
268extern void audit_put_watch(struct audit_watch *watch);
269extern void audit_get_watch(struct audit_watch *watch);
270extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
271 u32 op);
272extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
273extern void audit_remove_watch_rule(struct audit_krule *krule);
274extern char *audit_watch_path(struct audit_watch *watch);
275extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
276 dev_t dev);
277
278extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
279 char *pathname, int len);
280extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
281extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
282extern void audit_remove_mark_rule(struct audit_krule *krule);
283extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
284 unsigned long ino, dev_t dev);
285extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
286extern int audit_exe_compare(struct task_struct *tsk,
287 struct audit_fsnotify_mark *mark);
288
289extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
290extern void audit_put_chunk(struct audit_chunk *chunk);
291extern bool audit_tree_match(struct audit_chunk *chunk,
292 struct audit_tree *tree);
293extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
294extern int audit_add_tree_rule(struct audit_krule *rule);
295extern int audit_remove_tree_rule(struct audit_krule *rule);
296extern void audit_trim_trees(void);
297extern int audit_tag_tree(char *old, char *new);
298extern const char *audit_tree_path(struct audit_tree *tree);
299extern void audit_put_tree(struct audit_tree *tree);
300extern void audit_kill_trees(struct audit_context *context);
301
302extern int audit_signal_info(int sig, struct task_struct *t);
303extern void audit_filter_inodes(struct task_struct *tsk,
304 struct audit_context *ctx);
305extern struct list_head *audit_killed_trees(void);
306#else /* CONFIG_AUDITSYSCALL */
307#define auditsc_get_stamp(c, t, s) 0
308#define audit_put_watch(w) {}
309#define audit_get_watch(w) {}
310#define audit_to_watch(k, p, l, o) (-EINVAL)
311#define audit_add_watch(k, l) (-EINVAL)
312#define audit_remove_watch_rule(k) BUG()
313#define audit_watch_path(w) ""
314#define audit_watch_compare(w, i, d) 0
315
316#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
317#define audit_mark_path(m) ""
318#define audit_remove_mark(m)
319#define audit_remove_mark_rule(k)
320#define audit_mark_compare(m, i, d) 0
321#define audit_exe_compare(t, m) (-EINVAL)
322#define audit_dupe_exe(n, o) (-EINVAL)
323
324#define audit_remove_tree_rule(rule) BUG()
325#define audit_add_tree_rule(rule) -EINVAL
326#define audit_make_tree(rule, str, op) -EINVAL
327#define audit_trim_trees() (void)0
328#define audit_put_tree(tree) (void)0
329#define audit_tag_tree(old, new) -EINVAL
330#define audit_tree_path(rule) "" /* never called */
331#define audit_kill_trees(context) BUG()
332
333#define audit_signal_info(s, t) AUDIT_DISABLED
334#define audit_filter_inodes(t, c) AUDIT_DISABLED
335#endif /* CONFIG_AUDITSYSCALL */
336
337extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
338
339extern pid_t audit_sig_pid;
340extern kuid_t audit_sig_uid;
341extern u32 audit_sig_sid;
342
343extern int audit_filter(int msgtype, unsigned int listtype);
344
345extern void audit_ctl_lock(void);
346extern void audit_ctl_unlock(void);
347