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-rw-r--r--src/lib/libcrypto/rand/randfile.c143
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diff --git a/src/lib/libcrypto/rand/randfile.c b/src/lib/libcrypto/rand/randfile.c
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1/* $OpenBSD: randfile.c,v 1.42 2015/09/10 15:56:25 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <errno.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <unistd.h>
63#include <string.h>
64
65#include <openssl/crypto.h>
66#include <openssl/rand.h>
67#include <openssl/buffer.h>
68
69#include <sys/types.h>
70#include <sys/stat.h>
71#include <fcntl.h>
72
73#undef BUFSIZE
74#define BUFSIZE 1024
75#define RAND_DATA 1024
76
77/* Note that these functions should not be used. */
78
79int
80RAND_load_file(const char *file, long bytes)
81{
82 /* the "whole" file */
83 if (bytes == -1)
84 return 123456;
85 else
86 return bytes;
87}
88
89int
90RAND_write_file(const char *file)
91{
92 unsigned char buf[BUFSIZE];
93 int i, ret = 0;
94 FILE *out = NULL;
95 int n, fd;
96 struct stat sb;
97
98 /*
99 * If this file is a device, avoid opening it.
100 * XXX TOCTOU
101 */
102 if (stat(file, &sb) != -1 &&
103 (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode))) {
104 return (1);
105 }
106
107 fd = open(file, O_WRONLY|O_CREAT, 0600);
108 if (fd == -1)
109 return (1);
110 out = fdopen(fd, "wb");
111
112 if (out == NULL) {
113 close(fd);
114 return (1);
115 }
116
117 n = RAND_DATA;
118 for (;;) {
119 i = (n > BUFSIZE) ? BUFSIZE : n;
120 n -= BUFSIZE;
121 arc4random_buf(buf, i);
122 i = fwrite(buf, 1, i, out);
123 if (i <= 0) {
124 ret = 0;
125 break;
126 }
127 ret += i;
128 if (n <= 0)
129 break;
130 }
131
132 fclose(out);
133 explicit_bzero(buf, BUFSIZE);
134 return ret;
135}
136
137const char *
138RAND_file_name(char * buf, size_t size)
139{
140 if (strlcpy(buf, "/dev/urandom", size) >= size)
141 return (NULL);
142 return buf;
143}