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1 | | /* |
2 | | * Copyright (c) 2018 Yubico AB. All rights reserved. |
3 | | * Use of this source code is governed by a BSD-style |
4 | | * license that can be found in the LICENSE file. |
5 | | */ |
6 | | |
7 | | #include <sys/types.h> |
8 | | #include <sys/stat.h> |
9 | | #ifdef HAVE_SYS_RANDOM_H |
10 | | #include <sys/random.h> |
11 | | #endif |
12 | | |
13 | | #include <fcntl.h> |
14 | | #include <stdint.h> |
15 | | #include <stdlib.h> |
16 | | #include <string.h> |
17 | | #ifdef HAVE_UNISTD_H |
18 | | #include <unistd.h> |
19 | | #endif |
20 | | |
21 | | #include "fido.h" |
22 | | |
23 | | #if defined(_WIN32) |
24 | | #include <windows.h> |
25 | | |
26 | | #include <winternl.h> |
27 | | #include <winerror.h> |
28 | | #include <stdio.h> |
29 | | #include <bcrypt.h> |
30 | | #include <sal.h> |
31 | | |
32 | | int |
33 | | fido_get_random(void *buf, size_t len) |
34 | | { |
35 | | NTSTATUS status; |
36 | | |
37 | | status = BCryptGenRandom(NULL, buf, (ULONG)len, |
38 | | BCRYPT_USE_SYSTEM_PREFERRED_RNG); |
39 | | |
40 | | if (!NT_SUCCESS(status)) |
41 | | return (-1); |
42 | | |
43 | | return (0); |
44 | | } |
45 | | #elif defined(HAVE_ARC4RANDOM_BUF) |
46 | | int |
47 | | fido_get_random(void *buf, size_t len) |
48 | | { |
49 | | arc4random_buf(buf, len); |
50 | | return (0); |
51 | | } |
52 | | #elif defined(HAVE_GETRANDOM) |
53 | | int |
54 | | fido_get_random(void *buf, size_t len) |
55 | 27.6k | { |
56 | 27.6k | ssize_t r; |
57 | 27.6k | |
58 | 27.6k | if ((r = getrandom(buf, len, 0)) < 0 || (size_t)r != len) |
59 | 0 | return (-1); |
60 | 27.6k | |
61 | 27.6k | return (0); |
62 | 27.6k | } |
63 | | #elif defined(HAVE_DEV_URANDOM) |
64 | | int |
65 | | fido_get_random(void *buf, size_t len) |
66 | | { |
67 | | int fd = -1; |
68 | | int ok = -1; |
69 | | ssize_t r; |
70 | | |
71 | | if ((fd = open(FIDO_RANDOM_DEV, O_RDONLY)) < 0) |
72 | | goto fail; |
73 | | if ((r = read(fd, buf, len)) < 0 || (size_t)r != len) |
74 | | goto fail; |
75 | | |
76 | | ok = 0; |
77 | | fail: |
78 | | if (fd != -1) |
79 | | close(fd); |
80 | | |
81 | | return (ok); |
82 | | } |
83 | | #else |
84 | | #error "please provide an implementation of fido_get_random() for your platform" |
85 | | #endif /* _WIN32 */ |