1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <linux/netlink.h>
#include <stdio.h>
#include <sys/socket.h>
#include "alloc-util.h"
#include "audit-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "parse-util.h"
#include "process-util.h"
#include "user-util.h"
int audit_session_from_pid(pid_t pid, uint32_t *id) {
_cleanup_free_ char *s = NULL;
const char *p;
uint32_t u;
int r;
assert(id);
/* We don't convert ENOENT to ESRCH here, since we can't
* really distinguish between "audit is not available in the
* kernel" and "the process does not exist", both which will
* result in ENOENT. */
p = procfs_file_alloca(pid, "sessionid");
r = read_one_line_file(p, &s);
if (r < 0)
return r;
r = safe_atou32(s, &u);
if (r < 0)
return r;
if (!audit_session_is_valid(u))
return -ENODATA;
*id = u;
return 0;
}
int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
_cleanup_free_ char *s = NULL;
const char *p;
uid_t u;
int r;
assert(uid);
p = procfs_file_alloca(pid, "loginuid");
r = read_one_line_file(p, &s);
if (r < 0)
return r;
r = parse_uid(s, &u);
if (r == -ENXIO) /* the UID was -1 */
return -ENODATA;
if (r < 0)
return r;
*uid = u;
return 0;
}
bool use_audit(void) {
static int cached_use = -1;
if (cached_use < 0) {
int fd;
fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
if (fd < 0) {
cached_use = !IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT, EPERM);
if (!cached_use)
log_debug_errno(errno, "Won't talk to audit: %m");
} else {
cached_use = true;
safe_close(fd);
}
}
return cached_use;
}
|
