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