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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;
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* audit -- definition of audit_context structure and supporting types
3 *
4 * Copyright 2003-2004 Red Hat, Inc.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright 2005 IBM Corporation
7 */
8
9#ifndef _KERNEL_AUDIT_H_
10#define _KERNEL_AUDIT_H_
11
12#include <linux/fs.h>
13#include <linux/audit.h>
14#include <linux/skbuff.h>
15#include <uapi/linux/mqueue.h>
16#include <linux/tty.h>
17#include <uapi/linux/openat2.h> // struct open_how
18
19/* AUDIT_NAMES is the number of slots we reserve in the audit_context
20 * for saving names from getname(). If we get more names we will allocate
21 * a name dynamically and also add those to the list anchored by names_list. */
22#define AUDIT_NAMES 5
23
24/* At task start time, the audit_state is set in the audit_context using
25 a per-task filter. At syscall entry, the audit_state is augmented by
26 the syscall filter. */
27enum audit_state {
28 AUDIT_STATE_DISABLED, /* Do not create per-task audit_context.
29 * No syscall-specific audit records can
30 * be generated. */
31 AUDIT_STATE_BUILD, /* Create the per-task audit_context,
32 * and fill it in at syscall
33 * entry time. This makes a full
34 * syscall record available if some
35 * other part of the kernel decides it
36 * should be recorded. */
37 AUDIT_STATE_RECORD /* Create the per-task audit_context,
38 * always fill it in at syscall entry
39 * time, and always write out the audit
40 * record at syscall exit time. */
41};
42
43/* Rule lists */
44struct audit_watch;
45struct audit_fsnotify_mark;
46struct audit_tree;
47struct audit_chunk;
48
49struct audit_entry {
50 struct list_head list;
51 struct rcu_head rcu;
52 struct audit_krule rule;
53};
54
55struct audit_cap_data {
56 kernel_cap_t permitted;
57 kernel_cap_t inheritable;
58 union {
59 unsigned int fE; /* effective bit of file cap */
60 kernel_cap_t effective; /* effective set of process */
61 };
62 kernel_cap_t ambient;
63 kuid_t rootid;
64};
65
66/* When fs/namei.c:getname() is called, we store the pointer in name and bump
67 * the refcnt in the associated filename struct.
68 *
69 * Further, in fs/namei.c:path_lookup() we store the inode and device.
70 */
71struct audit_names {
72 struct list_head list; /* audit_context->names_list */
73
74 struct filename *name;
75 int name_len; /* number of chars to log */
76 bool hidden; /* don't log this record */
77
78 unsigned long ino;
79 dev_t dev;
80 umode_t mode;
81 kuid_t uid;
82 kgid_t gid;
83 dev_t rdev;
84 u32 osid;
85 struct audit_cap_data fcap;
86 unsigned int fcap_ver;
87 unsigned char type; /* record type */
88 /*
89 * This was an allocated audit_names and not from the array of
90 * names allocated in the task audit context. Thus this name
91 * should be freed on syscall exit.
92 */
93 bool should_free;
94};
95
96struct audit_proctitle {
97 int len; /* length of the cmdline field. */
98 char *value; /* the cmdline field */
99};
100
101/* The per-task audit context. */
102struct audit_context {
103 int dummy; /* must be the first element */
104 enum {
105 AUDIT_CTX_UNUSED, /* audit_context is currently unused */
106 AUDIT_CTX_SYSCALL, /* in use by syscall */
107 AUDIT_CTX_URING, /* in use by io_uring */
108 } context;
109 enum audit_state state, current_state;
110 unsigned int serial; /* serial number for record */
111 int major; /* syscall number */
112 int uring_op; /* uring operation */
113 struct timespec64 ctime; /* time of syscall entry */
114 unsigned long argv[4]; /* syscall arguments */
115 long return_code;/* syscall return code */
116 u64 prio;
117 int return_valid; /* return code is valid */
118 /*
119 * The names_list is the list of all audit_names collected during this
120 * syscall. The first AUDIT_NAMES entries in the names_list will
121 * actually be from the preallocated_names array for performance
122 * reasons. Except during allocation they should never be referenced
123 * through the preallocated_names array and should only be found/used
124 * by running the names_list.
125 */
126 struct audit_names preallocated_names[AUDIT_NAMES];
127 int name_count; /* total records in names_list */
128 struct list_head names_list; /* struct audit_names->list anchor */
129 char *filterkey; /* key for rule that triggered record */
130 struct path pwd;
131 struct audit_aux_data *aux;
132 struct audit_aux_data *aux_pids;
133 struct sockaddr_storage *sockaddr;
134 size_t sockaddr_len;
135 /* Save things to print about task_struct */
136 pid_t ppid;
137 kuid_t uid, euid, suid, fsuid;
138 kgid_t gid, egid, sgid, fsgid;
139 unsigned long personality;
140 int arch;
141
142 pid_t target_pid;
143 kuid_t target_auid;
144 kuid_t target_uid;
145 unsigned int target_sessionid;
146 u32 target_sid;
147 char target_comm[TASK_COMM_LEN];
148
149 struct audit_tree_refs *trees, *first_trees;
150 struct list_head killed_trees;
151 int tree_count;
152
153 int type;
154 union {
155 struct {
156 int nargs;
157 long args[6];
158 } socketcall;
159 struct {
160 kuid_t uid;
161 kgid_t gid;
162 umode_t mode;
163 u32 osid;
164 int has_perm;
165 uid_t perm_uid;
166 gid_t perm_gid;
167 umode_t perm_mode;
168 unsigned long qbytes;
169 } ipc;
170 struct {
171 mqd_t mqdes;
172 struct mq_attr mqstat;
173 } mq_getsetattr;
174 struct {
175 mqd_t mqdes;
176 int sigev_signo;
177 } mq_notify;
178 struct {
179 mqd_t mqdes;
180 size_t msg_len;
181 unsigned int msg_prio;
182 struct timespec64 abs_timeout;
183 } mq_sendrecv;
184 struct {
185 int oflag;
186 umode_t mode;
187 struct mq_attr attr;
188 } mq_open;
189 struct {
190 pid_t pid;
191 struct audit_cap_data cap;
192 } capset;
193 struct {
194 int fd;
195 int flags;
196 } mmap;
197 struct open_how openat2;
198 struct {
199 int argc;
200 } execve;
201 struct {
202 char *name;
203 } module;
204 struct {
205 struct audit_ntp_data ntp_data;
206 struct timespec64 tk_injoffset;
207 } time;
208 };
209 int fds[2];
210 struct audit_proctitle proctitle;
211};
212
213extern bool audit_ever_enabled;
214
215extern void audit_log_session_info(struct audit_buffer *ab);
216
217extern int auditd_test_task(struct task_struct *task);
218
219#define AUDIT_INODE_BUCKETS 32
220extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
221
222static 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
230extern int audit_match_class(int class, unsigned syscall);
231extern int audit_comparator(const u32 left, const u32 op, const u32 right);
232extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
233extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
234extern int parent_len(const char *path);
235extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
236extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
237 const void *payload, int size);
238extern void audit_panic(const char *message);
239
240struct audit_netlink_list {
241 __u32 portid;
242 struct net *net;
243 struct sk_buff_head q;
244};
245
246int audit_send_list_thread(void *_dest);
247
248extern struct mutex audit_filter_mutex;
249extern int audit_del_rule(struct audit_entry *entry);
250extern void audit_free_rule_rcu(struct rcu_head *head);
251extern struct list_head audit_filter_list[];
252
253extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
254
255extern void audit_log_d_path_exe(struct audit_buffer *ab,
256 struct mm_struct *mm);
257
258extern struct tty_struct *audit_get_tty(void);
259extern void audit_put_tty(struct tty_struct *tty);
260
261/* audit watch/mark/tree functions */
262#ifdef CONFIG_AUDITSYSCALL
263extern unsigned int audit_serial(void);
264extern int auditsc_get_stamp(struct audit_context *ctx,
265 struct timespec64 *t, unsigned int *serial);
266
267extern void audit_put_watch(struct audit_watch *watch);
268extern void audit_get_watch(struct audit_watch *watch);
269extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
270 u32 op);
271extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
272extern void audit_remove_watch_rule(struct audit_krule *krule);
273extern char *audit_watch_path(struct audit_watch *watch);
274extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
275 dev_t dev);
276
277extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
278 char *pathname, int len);
279extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
280extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
281extern void audit_remove_mark_rule(struct audit_krule *krule);
282extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
283 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,
286 struct audit_fsnotify_mark *mark);
287
288extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
289extern void audit_put_chunk(struct audit_chunk *chunk);
290extern bool audit_tree_match(struct audit_chunk *chunk,
291 struct audit_tree *tree);
292extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
293extern int audit_add_tree_rule(struct audit_krule *rule);
294extern int audit_remove_tree_rule(struct audit_krule *rule);
295extern void audit_trim_trees(void);
296extern int audit_tag_tree(char *old, char *new);
297extern const char *audit_tree_path(struct audit_tree *tree);
298extern void audit_put_tree(struct audit_tree *tree);
299extern void audit_kill_trees(struct audit_context *context);
300
301extern int audit_signal_info_syscall(struct task_struct *t);
302extern void audit_filter_inodes(struct task_struct *tsk,
303 struct audit_context *ctx);
304extern struct list_head *audit_killed_trees(void);
305#else /* CONFIG_AUDITSYSCALL */
306#define auditsc_get_stamp(c, t, s) 0
307#define audit_put_watch(w) do { } while (0)
308#define audit_get_watch(w) do { } while (0)
309#define audit_to_watch(k, p, l, o) (-EINVAL)
310#define audit_add_watch(k, l) (-EINVAL)
311#define audit_remove_watch_rule(k) BUG()
312#define audit_watch_path(w) ""
313#define audit_watch_compare(w, i, d) 0
314
315#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
316#define audit_mark_path(m) ""
317#define audit_remove_mark(m) do { } while (0)
318#define audit_remove_mark_rule(k) do { } while (0)
319#define audit_mark_compare(m, i, d) 0
320#define audit_exe_compare(t, m) (-EINVAL)
321#define audit_dupe_exe(n, o) (-EINVAL)
322
323#define audit_remove_tree_rule(rule) BUG()
324#define audit_add_tree_rule(rule) -EINVAL
325#define audit_make_tree(rule, str, op) -EINVAL
326#define audit_trim_trees() do { } while (0)
327#define audit_put_tree(tree) do { } while (0)
328#define audit_tag_tree(old, new) -EINVAL
329#define audit_tree_path(rule) "" /* never called */
330#define audit_kill_trees(context) BUG()
331
332static inline int audit_signal_info_syscall(struct task_struct *t)
333{
334 return 0;
335}
336
337#define audit_filter_inodes(t, c) AUDIT_STATE_DISABLED
338#endif /* CONFIG_AUDITSYSCALL */
339
340extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
341
342extern int audit_filter(int msgtype, unsigned int listtype);
343
344extern void audit_ctl_lock(void);
345extern void audit_ctl_unlock(void);
346
347#endif