app_rand.c revision 331638 
1/* apps/app_rand.c */
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 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 *    notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 *    notice, this list of conditions and the following disclaimer in
70 *    the documentation and/or other materials provided with the
71 *    distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 *    software must display the following acknowledgment:
75 *    "This product includes software developed by the OpenSSL Project
76 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 *    endorse or promote products derived from this software without
80 *    prior written permission. For written permission, please contact
81 *    openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 *    nor may "OpenSSL" appear in their names without prior written
85 *    permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 *    acknowledgment:
89 *    "This product includes software developed by the OpenSSL Project
90 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com).  This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#define NON_MAIN
113#include "apps.h"
114#undef NON_MAIN
115#include <openssl/bio.h>
116#include <openssl/rand.h>
117
118static int seeded = 0;
119static int egdsocket = 0;
120
121int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
122{
123    int consider_randfile = (file == NULL);
124    char buffer[200];
125
126#ifdef OPENSSL_SYS_WINDOWS
127    RAND_screen();
128#endif
129
130    if (file == NULL)
131        file = RAND_file_name(buffer, sizeof(buffer));
132    else if (RAND_egd(file) > 0) {
133        /*
134         * we try if the given filename is an EGD socket. if it is, we don't
135         * write anything back to the file.
136         */
137        egdsocket = 1;
138        return 1;
139    }
140    if (file == NULL || !RAND_load_file(file, -1)) {
141        if (RAND_status() == 0) {
142            if (!dont_warn) {
143                BIO_printf(bio_e, "unable to load 'random state'\n");
144                BIO_printf(bio_e,
145                           "This means that the random number generator has not been seeded\n");
146                BIO_printf(bio_e, "with much random data.\n");
147                if (consider_randfile) { /* explanation does not apply when a
148                                          * file is explicitly named */
149                    BIO_printf(bio_e,
150                               "Consider setting the RANDFILE environment variable to point at a file that\n");
151                    BIO_printf(bio_e,
152                               "'random' data can be kept in (the file will be overwritten).\n");
153                }
154            }
155            return 0;
156        }
157    }
158    seeded = 1;
159    return 1;
160}
161
162long app_RAND_load_files(char *name)
163{
164    char *p, *n;
165    int last;
166    long tot = 0;
167    int egd;
168
169    for (;;) {
170        last = 0;
171        for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
172        if (*p == '\0')
173            last = 1;
174        *p = '\0';
175        n = name;
176        name = p + 1;
177        if (*n == '\0')
178            break;
179
180        egd = RAND_egd(n);
181        if (egd > 0)
182            tot += egd;
183        else
184            tot += RAND_load_file(n, -1);
185        if (last)
186            break;
187    }
188    if (tot > 512)
189        app_RAND_allow_write_file();
190    return (tot);
191}
192
193int app_RAND_write_file(const char *file, BIO *bio_e)
194{
195    char buffer[200];
196
197    if (egdsocket || !seeded)
198        /*
199         * If we did not manage to read the seed file, we should not write a
200         * low-entropy seed file back -- it would suppress a crucial warning
201         * the next time we want to use it.
202         */
203        return 0;
204
205    if (file == NULL)
206        file = RAND_file_name(buffer, sizeof(buffer));
207    if (file == NULL || !RAND_write_file(file)) {
208        BIO_printf(bio_e, "unable to write 'random state'\n");
209        return 0;
210    }
211    return 1;
212}
213
214void app_RAND_allow_write_file(void)
215{
216    seeded = 1;
217}
218