summaryrefslogtreecommitdiff
path: root/kernel/audit.h (plain)
blob: 431444c3708bf4634568b9a8d83318de7c0fa22f
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};
72
73/* When fs/namei.c:getname() is called, we store the pointer in name and bump
74 * the refcnt in the associated filename struct.
75 *
76 * Further, in fs/namei.c:path_lookup() we store the inode and device.
77 */
78struct audit_names {
79 struct list_head list; /* audit_context->names_list */
80
81 struct filename *name;
82 int name_len; /* number of chars to log */
83 bool hidden; /* don't log this record */
84
85 unsigned long ino;
86 dev_t dev;
87 umode_t mode;
88 kuid_t uid;
89 kgid_t gid;
90 dev_t rdev;
91 u32 osid;
92 struct audit_cap_data fcap;
93 unsigned int fcap_ver;
94 unsigned char type; /* record type */
95 /*
96 * This was an allocated audit_names and not from the array of
97 * names allocated in the task audit context. Thus this name
98 * should be freed on syscall exit.
99 */
100 bool should_free;
101};
102
103struct audit_proctitle {
104 int len; /* length of the cmdline field. */
105 char *value; /* the cmdline field */
106};
107
108/* The per-task audit context. */
109struct audit_context {
110 int dummy; /* must be the first element */
111 int in_syscall; /* 1 if task is in a syscall */
112 enum audit_state state, current_state;
113 unsigned int serial; /* serial number for record */
114 int major; /* syscall number */
115 struct timespec ctime; /* time of syscall entry */
116 unsigned long argv[4]; /* syscall arguments */
117 long return_code;/* syscall return code */
118 u64 prio;
119 int return_valid; /* return code is valid */
120 /*
121 * The names_list is the list of all audit_names collected during this
122 * syscall. The first AUDIT_NAMES entries in the names_list will
123 * actually be from the preallocated_names array for performance
124 * reasons. Except during allocation they should never be referenced
125 * through the preallocated_names array and should only be found/used
126 * by running the names_list.
127 */
128 struct audit_names preallocated_names[AUDIT_NAMES];
129 int name_count; /* total records in names_list */
130 struct list_head names_list; /* struct audit_names->list anchor */
131 char *filterkey; /* key for rule that triggered record */
132 struct path pwd;
133 struct audit_aux_data *aux;
134 struct audit_aux_data *aux_pids;
135 struct sockaddr_storage *sockaddr;
136 size_t sockaddr_len;
137 /* Save things to print about task_struct */
138 pid_t pid, ppid;
139 kuid_t uid, euid, suid, fsuid;
140 kgid_t gid, egid, sgid, fsgid;
141 unsigned long personality;
142 int arch;
143
144 pid_t target_pid;
145 kuid_t target_auid;
146 kuid_t target_uid;
147 unsigned int target_sessionid;
148 u32 target_sid;
149 char target_comm[TASK_COMM_LEN];
150
151 struct audit_tree_refs *trees, *first_trees;
152 struct list_head killed_trees;
153 int tree_count;
154
155 int type;
156 union {
157 struct {
158 int nargs;
159 long args[6];
160 } socketcall;
161 struct {
162 kuid_t uid;
163 kgid_t gid;
164 umode_t mode;
165 u32 osid;
166 int has_perm;
167 uid_t perm_uid;
168 gid_t perm_gid;
169 umode_t perm_mode;
170 unsigned long qbytes;
171 } ipc;
172 struct {
173 mqd_t mqdes;
174 struct mq_attr mqstat;
175 } mq_getsetattr;
176 struct {
177 mqd_t mqdes;
178 int sigev_signo;
179 } mq_notify;
180 struct {
181 mqd_t mqdes;
182 size_t msg_len;
183 unsigned int msg_prio;
184 struct timespec abs_timeout;
185 } mq_sendrecv;
186 struct {
187 int oflag;
188 umode_t mode;
189 struct mq_attr attr;
190 } mq_open;
191 struct {
192 pid_t pid;
193 struct audit_cap_data cap;
194 } capset;
195 struct {
196 int fd;
197 int flags;
198 } mmap;
199 struct {
200 int argc;
201 } execve;
202 };
203 int fds[2];
204 struct audit_proctitle proctitle;
205};
206
207extern u32 audit_ever_enabled;
208
209extern void audit_copy_inode(struct audit_names *name,
210 const struct dentry *dentry,
211 struct inode *inode);
212extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
213 kernel_cap_t *cap);
214extern void audit_log_name(struct audit_context *context,
215 struct audit_names *n, struct path *path,
216 int record_num, int *call_panic);
217
218extern int audit_pid;
219
220#define AUDIT_INODE_BUCKETS 32
221extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
222
223static inline int audit_hash_ino(u32 ino)
224{
225 return (ino & (AUDIT_INODE_BUCKETS-1));
226}
227
228/* Indicates that audit should log the full pathname. */
229#define AUDIT_NAME_FULL -1
230
231extern int audit_match_class(int class, unsigned syscall);
232extern int audit_comparator(const u32 left, const u32 op, const u32 right);
233extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
234extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
235extern int parent_len(const char *path);
236extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
237extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type,
238 int done, int multi,
239 const void *payload, int size);
240extern void audit_panic(const char *message);
241
242struct audit_netlink_list {
243 __u32 portid;
244 struct net *net;
245 struct sk_buff_head q;
246};
247
248int audit_send_list(void *);
249
250struct audit_net {
251 struct sock *nlsk;
252};
253
254extern int selinux_audit_rule_update(void);
255
256extern struct mutex audit_filter_mutex;
257extern int audit_del_rule(struct audit_entry *);
258extern void audit_free_rule_rcu(struct rcu_head *);
259extern struct list_head audit_filter_list[];
260
261extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
262
263extern void audit_log_d_path_exe(struct audit_buffer *ab,
264 struct mm_struct *mm);
265
266extern struct tty_struct *audit_get_tty(struct task_struct *tsk);
267extern void audit_put_tty(struct tty_struct *tty);
268
269/* audit watch functions */
270#ifdef CONFIG_AUDIT_WATCH
271extern void audit_put_watch(struct audit_watch *watch);
272extern void audit_get_watch(struct audit_watch *watch);
273extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
274extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
275extern void audit_remove_watch_rule(struct audit_krule *krule);
276extern char *audit_watch_path(struct audit_watch *watch);
277extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
278
279extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, 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, unsigned long ino, dev_t dev);
284extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
285extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark);
286
287#else
288#define audit_put_watch(w) {}
289#define audit_get_watch(w) {}
290#define audit_to_watch(k, p, l, o) (-EINVAL)
291#define audit_add_watch(k, l) (-EINVAL)
292#define audit_remove_watch_rule(k) BUG()
293#define audit_watch_path(w) ""
294#define audit_watch_compare(w, i, d) 0
295
296#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
297#define audit_mark_path(m) ""
298#define audit_remove_mark(m)
299#define audit_remove_mark_rule(k)
300#define audit_mark_compare(m, i, d) 0
301#define audit_exe_compare(t, m) (-EINVAL)
302#define audit_dupe_exe(n, o) (-EINVAL)
303#endif /* CONFIG_AUDIT_WATCH */
304
305#ifdef CONFIG_AUDIT_TREE
306extern struct audit_chunk *audit_tree_lookup(const struct inode *);
307extern void audit_put_chunk(struct audit_chunk *);
308extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *);
309extern int audit_make_tree(struct audit_krule *, char *, u32);
310extern int audit_add_tree_rule(struct audit_krule *);
311extern int audit_remove_tree_rule(struct audit_krule *);
312extern void audit_trim_trees(void);
313extern int audit_tag_tree(char *old, char *new);
314extern const char *audit_tree_path(struct audit_tree *);
315extern void audit_put_tree(struct audit_tree *);
316extern void audit_kill_trees(struct list_head *);
317#else
318#define audit_remove_tree_rule(rule) BUG()
319#define audit_add_tree_rule(rule) -EINVAL
320#define audit_make_tree(rule, str, op) -EINVAL
321#define audit_trim_trees() (void)0
322#define audit_put_tree(tree) (void)0
323#define audit_tag_tree(old, new) -EINVAL
324#define audit_tree_path(rule) "" /* never called */
325#define audit_kill_trees(list) BUG()
326#endif
327
328extern char *audit_unpack_string(void **, size_t *, size_t);
329
330extern pid_t audit_sig_pid;
331extern kuid_t audit_sig_uid;
332extern u32 audit_sig_sid;
333
334extern int audit_filter(int msgtype, unsigned int listtype);
335
336#ifdef CONFIG_AUDITSYSCALL
337extern int __audit_signal_info(int sig, struct task_struct *t);
338static inline int audit_signal_info(int sig, struct task_struct *t)
339{
340 if (unlikely((audit_pid && t->tgid == audit_pid) ||
341 (audit_signals && !audit_dummy_context())))
342 return __audit_signal_info(sig, t);
343 return 0;
344}
345extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
346extern struct list_head *audit_killed_trees(void);
347#else
348#define audit_signal_info(s,t) AUDIT_DISABLED
349#define audit_filter_inodes(t,c) AUDIT_DISABLED
350#endif
351
352extern struct mutex audit_cmd_mutex;
353
generated by cgit at 2024-05-18 14:36:49 (GMT)