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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/* crypto/rand/randfile.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#include <errno.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63
64#include "openssl/e_os.h"
65
66#ifdef VMS
67#include <unixio.h>
68#endif
69#ifndef NO_SYS_TYPES_H
70# include <sys/types.h>
71#endif
72#ifdef MAC_OS_pre_X
73# include <stat.h>
74#else
75# include <sys/stat.h>
76#endif
77
78#include <openssl/crypto.h>
79#include <openssl/rand.h>
80
81#undef BUFSIZE
82#define BUFSIZE 1024
83#define RAND_DATA 1024
84
85/* #define RFILE ".rnd" - defined in ../../e_os.h */
86
87int RAND_load_file(const char *file, long bytes)
88 {
89 /* If bytes >= 0, read up to 'bytes' bytes.
90 * if bytes == -1, read complete file. */
91
92 MS_STATIC unsigned char buf[BUFSIZE];
93 struct stat sb;
94 int i,ret=0,n;
95 FILE *in;
96
97 if (file == NULL) return(0);
98
99 i=stat(file,&sb);
100 if (i < 0) {
101 /* If the state fails, put some crap in anyway */
102 RAND_add(&sb,sizeof(sb),0);
103 return(0);
104 }
105 if (bytes == 0) return(ret);
106 in=fopen(file,"rb");
107 if (in == NULL) goto err;
108 if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
109 /* this file is a device. we don't want read an infinite number
110 * of bytes from a random device, nor do we want to use buffered
111 * I/O because we will waste system entropy.
112 */
113 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
114 setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */
115 }
116 for (;;)
117 {
118 if (bytes > 0)
119 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
120 else
121 n = BUFSIZE;
122 i=fread(buf,1,n,in);
123 if (i <= 0) break;
124 /* even if n != i, use the full array */
125 RAND_add(buf,n,i);
126 ret+=i;
127 if (bytes > 0)
128 {
129 bytes-=n;
130 if (bytes <= 0) break;
131 }
132 }
133 fclose(in);
134 memset(buf,0,BUFSIZE);
135err:
136 return(ret);
137 }
138
139int RAND_write_file(const char *file)
140 {
141 unsigned char buf[BUFSIZE];
142 int i,ret=0,err=0;
143 FILE *out = NULL;
144 int n;
145 struct stat sb;
146
147 i=stat(file,&sb);
148 if (i != -1) {
149 if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
150 /* this file is a device. we don't write back to it.
151 * we "succeed" on the assumption this is some sort
152 * of random device. Otherwise attempting to write to
153 * and chmod the device causes problems.
154 */
155 return(1);
156 }
157 }
158
159#if defined(O_CREAT) && defined(O_EXCL) && !defined(WIN32)
160 /* For some reason Win32 can't write to files created this way */
161
162 /* chmod(..., 0600) is too late to protect the file,
163 * permissions should be restrictive from the start */
164 int fd = open(file, O_CREAT | O_EXCL, 0600);
165 if (fd != -1)
166 out = fdopen(fd, "wb");
167#endif
168 if (out == NULL)
169 out = fopen(file,"wb");
170 if (out == NULL) goto err;
171
172#ifndef NO_CHMOD
173 chmod(file,0600);
174#endif
175 n=RAND_DATA;
176 for (;;)
177 {
178 i=(n > BUFSIZE)?BUFSIZE:n;
179 n-=BUFSIZE;
180 if (RAND_bytes(buf,i) <= 0)
181 err=1;
182 i=fwrite(buf,1,i,out);
183 if (i <= 0)
184 {
185 ret=0;
186 break;
187 }
188 ret+=i;
189 if (n <= 0) break;
190 }
191#ifdef VMS
192 /* Try to delete older versions of the file, until there aren't
193 any */
194 {
195 char *tmpf;
196
197 tmpf = Malloc(strlen(file) + 4); /* to add ";-1" and a nul */
198 if (tmpf)
199 {
200 strcpy(tmpf, file);
201 strcat(tmpf, ";-1");
202 while(delete(tmpf) == 0)
203 ;
204 rename(file,";1"); /* Make sure it's version 1, or we
205 will reach the limit (32767) at
206 some point... */
207 }
208 }
209#endif /* VMS */
210
211 fclose(out);
212 memset(buf,0,BUFSIZE);
213err:
214 return(err ? -1 : ret);
215 }
216
217const char *RAND_file_name(char *buf, int size)
218 {
219 char *s;
220 char *ret=NULL;
221 struct stat sb;
222
223 s=getenv("RANDFILE");
224 if (s != NULL)
225 {
226 strncpy(buf,s,size-1);
227 buf[size-1]='\0';
228 ret=buf;
229 }
230 else
231 {
232 s=getenv("HOME");
233 if (s == NULL || *s == '\0')
234 ret = RFILE;
235 if (((int)(strlen(s)+strlen(RFILE)+2)) > size)
236 ret=RFILE;
237 else
238 {
239 strlcpy(buf,s,size);
240#ifndef VMS
241 strcat(buf,"/");
242#endif
243 strlcat(buf,RFILE,size);
244 ret=buf;
245 }
246 }
247#ifdef DEVRANDOM
248 /* given that all random loads just fail if the file can't be
249 * seen on a stat, we stat the file we're returning, if it
250 * fails, use DEVRANDOM instead. the allows the user to
251 * use their own source for good random data, but defaults
252 * to something hopefully decent if that isn't available.
253 */
254
255 if (stat(ret,&sb) == -1)
256 ret = DEVRANDOM;
257#endif
258 return(ret);
259 }
260
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