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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d7832d2c | 2 | |
d7832d2c | 3 | #include <errno.h> |
11c3a366 | 4 | #include <linux/netlink.h> |
d7832d2c | 5 | #include <stdio.h> |
11c3a366 | 6 | #include <sys/socket.h> |
d7832d2c | 7 | |
b5efdb8a | 8 | #include "alloc-util.h" |
430f0182 | 9 | #include "audit-util.h" |
3ffd4af2 | 10 | #include "fd-util.h" |
a5c32cff | 11 | #include "fileio.h" |
3ffd4af2 | 12 | #include "macro.h" |
6bedfcbb | 13 | #include "parse-util.h" |
3ffd4af2 | 14 | #include "process-util.h" |
b1d4f8e1 | 15 | #include "user-util.h" |
d7832d2c KS |
16 | |
17 | int audit_session_from_pid(pid_t pid, uint32_t *id) { | |
5b12334d LP |
18 | _cleanup_free_ char *s = NULL; |
19 | const char *p; | |
d7832d2c KS |
20 | uint32_t u; |
21 | int r; | |
22 | ||
23 | assert(id); | |
24 | ||
d7e46e01 | 25 | /* We don't convert ENOENT to ESRCH here, since we can't |
5238e957 | 26 | * really distinguish between "audit is not available in the |
d7e46e01 LP |
27 | * kernel" and "the process does not exist", both which will |
28 | * result in ENOENT. */ | |
29 | ||
b68fa010 | 30 | p = procfs_file_alloca(pid, "sessionid"); |
d7832d2c | 31 | |
5b12334d | 32 | r = read_one_line_file(p, &s); |
d7832d2c KS |
33 | if (r < 0) |
34 | return r; | |
35 | ||
36 | r = safe_atou32(s, &u); | |
d7832d2c KS |
37 | if (r < 0) |
38 | return r; | |
39 | ||
3a87a86e | 40 | if (!audit_session_is_valid(u)) |
d7e46e01 | 41 | return -ENODATA; |
d7832d2c KS |
42 | |
43 | *id = u; | |
44 | return 0; | |
45 | } | |
46 | ||
47 | int audit_loginuid_from_pid(pid_t pid, uid_t *uid) { | |
5b12334d LP |
48 | _cleanup_free_ char *s = NULL; |
49 | const char *p; | |
d7832d2c KS |
50 | uid_t u; |
51 | int r; | |
52 | ||
53 | assert(uid); | |
54 | ||
b68fa010 | 55 | p = procfs_file_alloca(pid, "loginuid"); |
d7832d2c | 56 | |
5b12334d | 57 | r = read_one_line_file(p, &s); |
d7832d2c KS |
58 | if (r < 0) |
59 | return r; | |
60 | ||
61 | r = parse_uid(s, &u); | |
d7e46e01 LP |
62 | if (r == -ENXIO) /* the UID was -1 */ |
63 | return -ENODATA; | |
d7832d2c KS |
64 | if (r < 0) |
65 | return r; | |
66 | ||
3a87a86e | 67 | *uid = u; |
d7832d2c KS |
68 | return 0; |
69 | } | |
cfb1f5df LP |
70 | |
71 | bool use_audit(void) { | |
72 | static int cached_use = -1; | |
73 | ||
74 | if (cached_use < 0) { | |
75 | int fd; | |
76 | ||
77 | fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT); | |
f006b30b GS |
78 | if (fd < 0) { |
79 | cached_use = !IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT, EPERM); | |
13bb68bb ZJS |
80 | if (!cached_use) |
81 | log_debug_errno(errno, "Won't talk to audit: %m"); | |
82 | } else { | |
cfb1f5df LP |
83 | cached_use = true; |
84 | safe_close(fd); | |
85 | } | |
86 | } | |
87 | ||
88 | return cached_use; | |
89 | } |