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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#include <linux/fs.h>
10#include <linux/audit.h>
11#include <linux/skbuff.h>
12#include <uapi/linux/mqueue.h>
13#include <linux/tty.h>
14
15/* AUDIT_NAMES is the number of slots we reserve in the audit_context
16 * for saving names from getname(). If we get more names we will allocate
17 * a name dynamically and also add those to the list anchored by names_list. */
18#define AUDIT_NAMES 5
19
20/* At task start time, the audit_state is set in the audit_context using
21 a per-task filter. At syscall entry, the audit_state is augmented by
22 the syscall filter. */
23enum audit_state {
24 AUDIT_DISABLED, /* Do not create per-task audit_context.
25 * No syscall-specific audit records can
26 * be generated. */
27 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
28 * and fill it in at syscall
29 * entry time. This makes a full
30 * syscall record available if some
31 * other part of the kernel decides it
32 * should be recorded. */
33 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
34 * always fill it in at syscall entry
35 * time, and always write out the audit
36 * record at syscall exit time. */
37};
38
39/* Rule lists */
40struct audit_watch;
41struct audit_fsnotify_mark;
42struct audit_tree;
43struct audit_chunk;
44
45struct audit_entry {
46 struct list_head list;
47 struct rcu_head rcu;
48 struct audit_krule rule;
49};
50
51struct audit_cap_data {
52 kernel_cap_t permitted;
53 kernel_cap_t inheritable;
54 union {
55 unsigned int fE; /* effective bit of file cap */
56 kernel_cap_t effective; /* effective set of process */
57 };
58 kernel_cap_t ambient;
59 kuid_t rootid;
60};
61
62/* When fs/namei.c:getname() is called, we store the pointer in name and bump
63 * the refcnt in the associated filename struct.
64 *
65 * Further, in fs/namei.c:path_lookup() we store the inode and device.
66 */
67struct audit_names {
68 struct list_head list; /* audit_context->names_list */
69
70 struct filename *name;
71 int name_len; /* number of chars to log */
72 bool hidden; /* don't log this record */
73
74 unsigned long ino;
75 dev_t dev;
76 umode_t mode;
77 kuid_t uid;
78 kgid_t gid;
79 dev_t rdev;
80 u32 osid;
81 struct audit_cap_data fcap;
82 unsigned int fcap_ver;
83 unsigned char type; /* record type */
84 /*
85 * This was an allocated audit_names and not from the array of
86 * names allocated in the task audit context. Thus this name
87 * should be freed on syscall exit.
88 */
89 bool should_free;
90};
91
92struct audit_proctitle {
93 int len; /* length of the cmdline field. */
94 char *value; /* the cmdline field */
95};
96
97/* The per-task audit context. */
98struct audit_context {
99 int dummy; /* must be the first element */
100 int in_syscall; /* 1 if task is in a syscall */
101 enum audit_state state, current_state;
102 unsigned int serial; /* serial number for record */
103 int major; /* syscall number */
104 struct timespec64 ctime; /* time of syscall entry */
105 unsigned long argv[4]; /* syscall arguments */
106 long return_code;/* syscall return code */
107 u64 prio;
108 int return_valid; /* return code is valid */
109 /*
110 * The names_list is the list of all audit_names collected during this
111 * syscall. The first AUDIT_NAMES entries in the names_list will
112 * actually be from the preallocated_names array for performance
113 * reasons. Except during allocation they should never be referenced
114 * through the preallocated_names array and should only be found/used
115 * by running the names_list.
116 */
117 struct audit_names preallocated_names[AUDIT_NAMES];
118 int name_count; /* total records in names_list */
119 struct list_head names_list; /* struct audit_names->list anchor */
120 char *filterkey; /* key for rule that triggered record */
121 struct path pwd;
122 struct audit_aux_data *aux;
123 struct audit_aux_data *aux_pids;
124 struct sockaddr_storage *sockaddr;
125 size_t sockaddr_len;
126 /* Save things to print about task_struct */
127 pid_t pid, ppid;
128 kuid_t uid, euid, suid, fsuid;
129 kgid_t gid, egid, sgid, fsgid;
130 unsigned long personality;
131 int arch;
132
133 pid_t target_pid;
134 kuid_t target_auid;
135 kuid_t target_uid;
136 unsigned int target_sessionid;
137 u32 target_sid;
138 char target_comm[TASK_COMM_LEN];
139
140 struct audit_tree_refs *trees, *first_trees;
141 struct list_head killed_trees;
142 int tree_count;
143
144 int type;
145 union {
146 struct {
147 int nargs;
148 long args[6];
149 } socketcall;
150 struct {
151 kuid_t uid;
152 kgid_t gid;
153 umode_t mode;
154 u32 osid;
155 int has_perm;
156 uid_t perm_uid;
157 gid_t perm_gid;
158 umode_t perm_mode;
159 unsigned long qbytes;
160 } ipc;
161 struct {
162 mqd_t mqdes;
163 struct mq_attr mqstat;
164 } mq_getsetattr;
165 struct {
166 mqd_t mqdes;
167 int sigev_signo;
168 } mq_notify;
169 struct {
170 mqd_t mqdes;
171 size_t msg_len;
172 unsigned int msg_prio;
173 struct timespec64 abs_timeout;
174 } mq_sendrecv;
175 struct {
176 int oflag;
177 umode_t mode;
178 struct mq_attr attr;
179 } mq_open;
180 struct {
181 pid_t pid;
182 struct audit_cap_data cap;
183 } capset;
184 struct {
185 int fd;
186 int flags;
187 } mmap;
188 struct {
189 int argc;
190 } execve;
191 struct {
192 char *name;
193 } module;
194 };
195 int fds[2];
196 struct audit_proctitle proctitle;
197};
198
199extern bool audit_ever_enabled;
200
201extern void audit_log_session_info(struct audit_buffer *ab);
202
203extern int auditd_test_task(struct task_struct *task);
204
205#define AUDIT_INODE_BUCKETS 32
206extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
207
208static inline int audit_hash_ino(u32 ino)
209{
210 return (ino & (AUDIT_INODE_BUCKETS-1));
211}
212
213/* Indicates that audit should log the full pathname. */
214#define AUDIT_NAME_FULL -1
215
216extern int audit_match_class(int class, unsigned syscall);
217extern int audit_comparator(const u32 left, const u32 op, const u32 right);
218extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
219extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
220extern int parent_len(const char *path);
221extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
222extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
223 const void *payload, int size);
224extern void audit_panic(const char *message);
225
226struct audit_netlink_list {
227 __u32 portid;
228 struct net *net;
229 struct sk_buff_head q;
230};
231
232int audit_send_list(void *_dest);
233
234extern int selinux_audit_rule_update(void);
235
236extern struct mutex audit_filter_mutex;
237extern int audit_del_rule(struct audit_entry *entry);
238extern void audit_free_rule_rcu(struct rcu_head *head);
239extern struct list_head audit_filter_list[];
240
241extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
242
243extern void audit_log_d_path_exe(struct audit_buffer *ab,
244 struct mm_struct *mm);
245
246extern struct tty_struct *audit_get_tty(void);
247extern void audit_put_tty(struct tty_struct *tty);
248
249/* audit watch/mark/tree functions */
250#ifdef CONFIG_AUDITSYSCALL
251extern unsigned int audit_serial(void);
252extern int auditsc_get_stamp(struct audit_context *ctx,
253 struct timespec64 *t, unsigned int *serial);
254
255extern void audit_put_watch(struct audit_watch *watch);
256extern void audit_get_watch(struct audit_watch *watch);
257extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
258 u32 op);
259extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
260extern void audit_remove_watch_rule(struct audit_krule *krule);
261extern char *audit_watch_path(struct audit_watch *watch);
262extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
263 dev_t dev);
264
265extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
266 char *pathname, int len);
267extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
268extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
269extern void audit_remove_mark_rule(struct audit_krule *krule);
270extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
271 unsigned long ino, dev_t dev);
272extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
273extern int audit_exe_compare(struct task_struct *tsk,
274 struct audit_fsnotify_mark *mark);
275
276extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
277extern void audit_put_chunk(struct audit_chunk *chunk);
278extern bool audit_tree_match(struct audit_chunk *chunk,
279 struct audit_tree *tree);
280extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
281extern int audit_add_tree_rule(struct audit_krule *rule);
282extern int audit_remove_tree_rule(struct audit_krule *rule);
283extern void audit_trim_trees(void);
284extern int audit_tag_tree(char *old, char *new);
285extern const char *audit_tree_path(struct audit_tree *tree);
286extern void audit_put_tree(struct audit_tree *tree);
287extern void audit_kill_trees(struct audit_context *context);
288
289extern int audit_signal_info_syscall(struct task_struct *t);
290extern void audit_filter_inodes(struct task_struct *tsk,
291 struct audit_context *ctx);
292extern struct list_head *audit_killed_trees(void);
293#else /* CONFIG_AUDITSYSCALL */
294#define auditsc_get_stamp(c, t, s) 0
295#define audit_put_watch(w) {}
296#define audit_get_watch(w) {}
297#define audit_to_watch(k, p, l, o) (-EINVAL)
298#define audit_add_watch(k, l) (-EINVAL)
299#define audit_remove_watch_rule(k) BUG()
300#define audit_watch_path(w) ""
301#define audit_watch_compare(w, i, d) 0
302
303#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
304#define audit_mark_path(m) ""
305#define audit_remove_mark(m)
306#define audit_remove_mark_rule(k)
307#define audit_mark_compare(m, i, d) 0
308#define audit_exe_compare(t, m) (-EINVAL)
309#define audit_dupe_exe(n, o) (-EINVAL)
310
311#define audit_remove_tree_rule(rule) BUG()
312#define audit_add_tree_rule(rule) -EINVAL
313#define audit_make_tree(rule, str, op) -EINVAL
314#define audit_trim_trees() (void)0
315#define audit_put_tree(tree) (void)0
316#define audit_tag_tree(old, new) -EINVAL
317#define audit_tree_path(rule) "" /* never called */
318#define audit_kill_trees(context) BUG()
319
320static inline int audit_signal_info_syscall(struct task_struct *t)
321{
322 return 0;
323}
324
325#define audit_filter_inodes(t, c) AUDIT_DISABLED
326#endif /* CONFIG_AUDITSYSCALL */
327
328extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
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
336extern void audit_ctl_lock(void);
337extern void audit_ctl_unlock(void);
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
26/* 0 = no checking
27 1 = put_count checking
28 2 = verbose put_count checking
29*/
30#define AUDIT_DEBUG 0
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. */
35enum audit_state {
36 AUDIT_DISABLED, /* Do not create per-task audit_context.
37 * No syscall-specific audit records can
38 * be generated. */
39 AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context,
40 * but don't necessarily fill it in at
41 * syscall entry time (i.e., filter
42 * instead). */
43 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
44 * and always fill it in at syscall
45 * entry time. This makes a full
46 * syscall record available if some
47 * other part of the kernel decides it
48 * should be recorded. */
49 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
50 * always fill it in at syscall entry
51 * time, and always write out the audit
52 * record at syscall exit time. */
53};
54
55/* Rule lists */
56struct audit_watch;
57struct audit_tree;
58struct audit_chunk;
59
60struct audit_entry {
61 struct list_head list;
62 struct rcu_head rcu;
63 struct audit_krule rule;
64};
65
66#ifdef CONFIG_AUDIT
67extern int audit_enabled;
68extern int audit_ever_enabled;
69#endif
70
71extern int audit_pid;
72
73#define AUDIT_INODE_BUCKETS 32
74extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
75
76static inline int audit_hash_ino(u32 ino)
77{
78 return (ino & (AUDIT_INODE_BUCKETS-1));
79}
80
81extern int audit_match_class(int class, unsigned syscall);
82extern int audit_comparator(const u32 left, const u32 op, const u32 right);
83extern int audit_compare_dname_path(const char *dname, const char *path,
84 int *dirlen);
85extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
86 int done, int multi,
87 const void *payload, int size);
88extern void audit_panic(const char *message);
89
90struct audit_netlink_list {
91 int pid;
92 struct sk_buff_head q;
93};
94
95int audit_send_list(void *);
96
97extern int selinux_audit_rule_update(void);
98
99extern struct mutex audit_filter_mutex;
100extern void audit_free_rule_rcu(struct rcu_head *);
101extern struct list_head audit_filter_list[];
102
103extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
104
105/* audit watch functions */
106#ifdef CONFIG_AUDIT_WATCH
107extern void audit_put_watch(struct audit_watch *watch);
108extern void audit_get_watch(struct audit_watch *watch);
109extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
110extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
111extern void audit_remove_watch_rule(struct audit_krule *krule);
112extern char *audit_watch_path(struct audit_watch *watch);
113extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
114#else
115#define audit_put_watch(w) {}
116#define audit_get_watch(w) {}
117#define audit_to_watch(k, p, l, o) (-EINVAL)
118#define audit_add_watch(k, l) (-EINVAL)
119#define audit_remove_watch_rule(k) BUG()
120#define audit_watch_path(w) ""
121#define audit_watch_compare(w, i, d) 0
122
123#endif /* CONFIG_AUDIT_WATCH */
124
125#ifdef CONFIG_AUDIT_TREE
126extern struct audit_chunk *audit_tree_lookup(const struct inode *);
127extern void audit_put_chunk(struct audit_chunk *);
128extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
129extern int audit_make_tree(struct audit_krule *, char *, u32);
130extern int audit_add_tree_rule(struct audit_krule *);
131extern int audit_remove_tree_rule(struct audit_krule *);
132extern void audit_trim_trees(void);
133extern int audit_tag_tree(char *old, char *new);
134extern const char *audit_tree_path(struct audit_tree *);
135extern void audit_put_tree(struct audit_tree *);
136extern void audit_kill_trees(struct list_head *);
137#else
138#define audit_remove_tree_rule(rule) BUG()
139#define audit_add_tree_rule(rule) -EINVAL
140#define audit_make_tree(rule, str, op) -EINVAL
141#define audit_trim_trees() (void)0
142#define audit_put_tree(tree) (void)0
143#define audit_tag_tree(old, new) -EINVAL
144#define audit_tree_path(rule) "" /* never called */
145#define audit_kill_trees(list) BUG()
146#endif
147
148extern char *audit_unpack_string(void **, size_t *, size_t);
149
150extern pid_t audit_sig_pid;
151extern uid_t audit_sig_uid;
152extern u32 audit_sig_sid;
153
154#ifdef CONFIG_AUDITSYSCALL
155extern int __audit_signal_info(int sig, struct task_struct *t);
156static inline int audit_signal_info(int sig, struct task_struct *t)
157{
158 if (unlikely((audit_pid && t->tgid == audit_pid) ||
159 (audit_signals && !audit_dummy_context())))
160 return __audit_signal_info(sig, t);
161 return 0;
162}
163extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
164extern struct list_head *audit_killed_trees(void);
165#else
166#define audit_signal_info(s,t) AUDIT_DISABLED
167#define audit_filter_inodes(t,c) AUDIT_DISABLED
168#endif
169
170extern struct mutex audit_cmd_mutex;