• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
118 
119 static int seeded = 0;
120 static int egdsocket = 0;
121 
app_RAND_load_file(const char * file,BIO * bio_e,int dont_warn)122 int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
123 	{
124 	int consider_randfile = (file == NULL);
125 	char buffer[200];
126 
127 #ifdef OPENSSL_SYS_WINDOWS
128 	BIO_printf(bio_e,"Loading 'screen' into random state -");
129 	BIO_flush(bio_e);
130 	RAND_screen();
131 	BIO_printf(bio_e," done\n");
132 #endif
133 
134 	if (file == NULL)
135 		file = RAND_file_name(buffer, sizeof buffer);
136 	else if (RAND_egd(file) > 0)
137 		{
138 		/* we try if the given filename is an EGD socket.
139 		   if it is, we don't write anything back to the file. */
140 		egdsocket = 1;
141 		return 1;
142 		}
143 	if (file == NULL || !RAND_load_file(file, -1))
144 		{
145 		if (RAND_status() == 0)
146 			{
147 			if (!dont_warn)
148 				{
149 				BIO_printf(bio_e,"unable to load 'random state'\n");
150 				BIO_printf(bio_e,"This means that the random number generator has not been seeded\n");
151 				BIO_printf(bio_e,"with much random data.\n");
152 				if (consider_randfile) /* explanation does not apply when a file is explicitly named */
153 					{
154 					BIO_printf(bio_e,"Consider setting the RANDFILE environment variable to point at a file that\n");
155 					BIO_printf(bio_e,"'random' data can be kept in (the file will be overwritten).\n");
156 					}
157 				}
158 			return 0;
159 			}
160 		}
161 	seeded = 1;
162 	return 1;
163 	}
164 
app_RAND_load_files(char * name)165 long app_RAND_load_files(char *name)
166 	{
167 	char *p,*n;
168 	int last;
169 	long tot=0;
170 	int egd;
171 
172 	for (;;)
173 		{
174 		last=0;
175 		for (p=name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++);
176 		if (*p == '\0') last=1;
177 		*p='\0';
178 		n=name;
179 		name=p+1;
180 		if (*n == '\0') break;
181 
182 		egd=RAND_egd(n);
183 		if (egd > 0)
184 			tot+=egd;
185 		else
186 			tot+=RAND_load_file(n,-1);
187 		if (last) break;
188 		}
189 	if (tot > 512)
190 		app_RAND_allow_write_file();
191 	return(tot);
192 	}
193 
app_RAND_write_file(const char * file,BIO * bio_e)194 int app_RAND_write_file(const char *file, BIO *bio_e)
195 	{
196 	char buffer[200];
197 
198 	if (egdsocket || !seeded)
199 		/* If we did not manage to read the seed file,
200 		 * we should not write a low-entropy seed file back --
201 		 * it would suppress a crucial warning the next time
202 		 * we want to use it. */
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 		{
209 		BIO_printf(bio_e,"unable to write 'random state'\n");
210 		return 0;
211 		}
212 	return 1;
213 	}
214 
app_RAND_allow_write_file(void)215 void app_RAND_allow_write_file(void)
216 	{
217 	seeded = 1;
218 	}
219