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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "keyring-util.h"
#include "memory-util.h"
#include "missing_syscall.h"
int keyring_read(key_serial_t serial, void **ret, size_t *ret_size) {
size_t bufsize = 100;
for (;;) {
_cleanup_(erase_and_freep) uint8_t *buf = NULL;
long n;
buf = new(uint8_t, bufsize + 1);
if (!buf)
return -ENOMEM;
n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) buf, (unsigned long) bufsize, 0);
if (n < 0)
return -errno;
if ((size_t) n <= bufsize) {
buf[n] = 0; /* NUL terminate, just in case */
if (ret)
*ret = TAKE_PTR(buf);
if (ret_size)
*ret_size = n;
return 0;
}
bufsize = (size_t) n;
}
}
int keyring_describe(key_serial_t serial, char **ret) {
_cleanup_free_ char *tuple = NULL;
size_t sz = 64;
int c = -1; /* Workaround for maybe-uninitialized false positive due to missing_syscall indirection */
assert(ret);
for (;;) {
tuple = new(char, sz);
if (!tuple)
return log_oom_debug();
c = keyctl(KEYCTL_DESCRIBE, serial, (unsigned long) tuple, c, 0);
if (c < 0)
return log_debug_errno(errno, "Failed to describe key id %d: %m", serial);
if ((size_t) c <= sz)
break;
sz = c;
free(tuple);
}
/* The kernel returns a final NUL in the string, verify that. */
assert(tuple[c-1] == 0);
*ret = TAKE_PTR(tuple);
return 0;
}
|
