Root/kernel/audit.h

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/* 0 = no checking
28   1 = put_count checking
29   2 = verbose put_count checking
30*/
31#define AUDIT_DEBUG 0
32
33/* AUDIT_NAMES is the number of slots we reserve in the audit_context
34 * for saving names from getname(). If we get more names we will allocate
35 * a name dynamically and also add those to the list anchored by names_list. */
36#define AUDIT_NAMES 5
37
38/* At task start time, the audit_state is set in the audit_context using
39   a per-task filter. At syscall entry, the audit_state is augmented by
40   the syscall filter. */
41enum audit_state {
42    AUDIT_DISABLED, /* Do not create per-task audit_context.
43                 * No syscall-specific audit records can
44                 * be generated. */
45    AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
46                 * and fill it in at syscall
47                 * entry time. This makes a full
48                 * syscall record available if some
49                 * other part of the kernel decides it
50                 * should be recorded. */
51    AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
52                 * always fill it in at syscall entry
53                 * time, and always write out the audit
54                 * record at syscall exit time. */
55};
56
57/* Rule lists */
58struct audit_watch;
59struct audit_tree;
60struct audit_chunk;
61
62struct audit_entry {
63    struct list_head list;
64    struct rcu_head rcu;
65    struct audit_krule rule;
66};
67
68struct audit_cap_data {
69    kernel_cap_t permitted;
70    kernel_cap_t inheritable;
71    union {
72        unsigned int fE; /* effective bit of file cap */
73        kernel_cap_t effective; /* effective set of process */
74    };
75};
76
77/* When fs/namei.c:getname() is called, we store the pointer in name and
78 * we don't let putname() free it (instead we free all of the saved
79 * pointers at syscall exit time).
80 *
81 * Further, in fs/namei.c:path_lookup() we store the inode and device.
82 */
83struct audit_names {
84    struct list_head list; /* audit_context->names_list */
85
86    struct filename *name;
87    int name_len; /* number of chars to log */
88    bool hidden; /* don't log this record */
89    bool name_put; /* call __putname()? */
90
91    unsigned long ino;
92    dev_t dev;
93    umode_t mode;
94    kuid_t uid;
95    kgid_t gid;
96    dev_t rdev;
97    u32 osid;
98    struct audit_cap_data fcap;
99    unsigned int fcap_ver;
100    unsigned char type; /* record type */
101    /*
102     * This was an allocated audit_names and not from the array of
103     * names allocated in the task audit context. Thus this name
104     * should be freed on syscall exit.
105     */
106    bool should_free;
107};
108
109struct audit_proctitle {
110    int len; /* length of the cmdline field. */
111    char *value; /* the cmdline field */
112};
113
114/* The per-task audit context. */
115struct audit_context {
116    int dummy; /* must be the first element */
117    int in_syscall; /* 1 if task is in a syscall */
118    enum audit_state state, current_state;
119    unsigned int serial; /* serial number for record */
120    int major; /* syscall number */
121    struct timespec ctime; /* time of syscall entry */
122    unsigned long argv[4]; /* syscall arguments */
123    long return_code;/* syscall return code */
124    u64 prio;
125    int return_valid; /* return code is valid */
126    /*
127     * The names_list is the list of all audit_names collected during this
128     * syscall. The first AUDIT_NAMES entries in the names_list will
129     * actually be from the preallocated_names array for performance
130     * reasons. Except during allocation they should never be referenced
131     * through the preallocated_names array and should only be found/used
132     * by running the names_list.
133     */
134    struct audit_names preallocated_names[AUDIT_NAMES];
135    int name_count; /* total records in names_list */
136    struct list_head names_list; /* struct audit_names->list anchor */
137    char *filterkey; /* key for rule that triggered record */
138    struct path pwd;
139    struct audit_aux_data *aux;
140    struct audit_aux_data *aux_pids;
141    struct sockaddr_storage *sockaddr;
142    size_t sockaddr_len;
143                /* Save things to print about task_struct */
144    pid_t pid, ppid;
145    kuid_t uid, euid, suid, fsuid;
146    kgid_t gid, egid, sgid, fsgid;
147    unsigned long personality;
148    int arch;
149
150    pid_t target_pid;
151    kuid_t target_auid;
152    kuid_t target_uid;
153    unsigned int target_sessionid;
154    u32 target_sid;
155    char target_comm[TASK_COMM_LEN];
156
157    struct audit_tree_refs *trees, *first_trees;
158    struct list_head killed_trees;
159    int tree_count;
160
161    int type;
162    union {
163        struct {
164            int nargs;
165            long args[6];
166        } socketcall;
167        struct {
168            kuid_t uid;
169            kgid_t gid;
170            umode_t mode;
171            u32 osid;
172            int has_perm;
173            uid_t perm_uid;
174            gid_t perm_gid;
175            umode_t perm_mode;
176            unsigned long qbytes;
177        } ipc;
178        struct {
179            mqd_t mqdes;
180            struct mq_attr mqstat;
181        } mq_getsetattr;
182        struct {
183            mqd_t mqdes;
184            int sigev_signo;
185        } mq_notify;
186        struct {
187            mqd_t mqdes;
188            size_t msg_len;
189            unsigned int msg_prio;
190            struct timespec abs_timeout;
191        } mq_sendrecv;
192        struct {
193            int oflag;
194            umode_t mode;
195            struct mq_attr attr;
196        } mq_open;
197        struct {
198            pid_t pid;
199            struct audit_cap_data cap;
200        } capset;
201        struct {
202            int fd;
203            int flags;
204        } mmap;
205        struct {
206            int argc;
207        } execve;
208    };
209    int fds[2];
210    struct audit_proctitle proctitle;
211
212#if AUDIT_DEBUG
213    int put_count;
214    int ino_count;
215#endif
216};
217
218extern u32 audit_ever_enabled;
219
220extern void audit_copy_inode(struct audit_names *name,
221                 const struct dentry *dentry,
222                 const struct inode *inode);
223extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
224              kernel_cap_t *cap);
225extern void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name);
226extern void audit_log_name(struct audit_context *context,
227               struct audit_names *n, struct path *path,
228               int record_num, int *call_panic);
229
230extern int audit_pid;
231
232#define AUDIT_INODE_BUCKETS 32
233extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
234
235static inline int audit_hash_ino(u32 ino)
236{
237    return (ino & (AUDIT_INODE_BUCKETS-1));
238}
239
240/* Indicates that audit should log the full pathname. */
241#define AUDIT_NAME_FULL -1
242
243extern int audit_match_class(int class, unsigned syscall);
244extern int audit_comparator(const u32 left, const u32 op, const u32 right);
245extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
246extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
247extern int parent_len(const char *path);
248extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
249extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type,
250                    int done, int multi,
251                    const void *payload, int size);
252extern void audit_panic(const char *message);
253
254struct audit_netlink_list {
255    __u32 portid;
256    struct net *net;
257    struct sk_buff_head q;
258};
259
260int audit_send_list(void *);
261
262struct audit_net {
263    struct sock *nlsk;
264};
265
266extern int selinux_audit_rule_update(void);
267
268extern struct mutex audit_filter_mutex;
269extern void audit_free_rule_rcu(struct rcu_head *);
270extern struct list_head audit_filter_list[];
271
272extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
273
274/* audit watch functions */
275#ifdef CONFIG_AUDIT_WATCH
276extern void audit_put_watch(struct audit_watch *watch);
277extern void audit_get_watch(struct audit_watch *watch);
278extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
279extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
280extern void audit_remove_watch_rule(struct audit_krule *krule);
281extern char *audit_watch_path(struct audit_watch *watch);
282extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
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#endif /* CONFIG_AUDIT_WATCH */
293
294#ifdef CONFIG_AUDIT_TREE
295extern struct audit_chunk *audit_tree_lookup(const struct inode *);
296extern void audit_put_chunk(struct audit_chunk *);
297extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
298extern int audit_make_tree(struct audit_krule *, char *, u32);
299extern int audit_add_tree_rule(struct audit_krule *);
300extern int audit_remove_tree_rule(struct audit_krule *);
301extern void audit_trim_trees(void);
302extern int audit_tag_tree(char *old, char *new);
303extern const char *audit_tree_path(struct audit_tree *);
304extern void audit_put_tree(struct audit_tree *);
305extern void audit_kill_trees(struct list_head *);
306#else
307#define audit_remove_tree_rule(rule) BUG()
308#define audit_add_tree_rule(rule) -EINVAL
309#define audit_make_tree(rule, str, op) -EINVAL
310#define audit_trim_trees() (void)0
311#define audit_put_tree(tree) (void)0
312#define audit_tag_tree(old, new) -EINVAL
313#define audit_tree_path(rule) "" /* never called */
314#define audit_kill_trees(list) BUG()
315#endif
316
317extern char *audit_unpack_string(void **, size_t *, size_t);
318
319extern pid_t audit_sig_pid;
320extern kuid_t audit_sig_uid;
321extern u32 audit_sig_sid;
322
323#ifdef CONFIG_AUDITSYSCALL
324extern int __audit_signal_info(int sig, struct task_struct *t);
325static inline int audit_signal_info(int sig, struct task_struct *t)
326{
327    if (unlikely((audit_pid && t->tgid == audit_pid) ||
328             (audit_signals && !audit_dummy_context())))
329        return __audit_signal_info(sig, t);
330    return 0;
331}
332extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
333extern struct list_head *audit_killed_trees(void);
334#else
335#define audit_signal_info(s,t) AUDIT_DISABLED
336#define audit_filter_inodes(t,c) AUDIT_DISABLED
337#endif
338
339extern struct mutex audit_cmd_mutex;
340

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