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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/* We need to define this to get macros like S_IFBLK and S_IFCHR */
60#define _XOPEN_SOURCE 500
61
62#include <errno.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66
67#include "e_os.h"
68#include <openssl/crypto.h>
69#include <openssl/rand.h>
70#include <openssl/buffer.h>
71
72#ifdef OPENSSL_SYS_VMS
73#include <unixio.h>
74#endif
75#ifndef NO_SYS_TYPES_H
76# include <sys/types.h>
77#endif
78#ifdef MAC_OS_pre_X
79# include <stat.h>
80#else
81# include <sys/stat.h>
82#endif
83
84#undef BUFSIZE
85#define BUFSIZE 1024
86#define RAND_DATA 1024
87
88/* #define RFILE ".rnd" - defined in ../../e_os.h */
89
90/* Note that these functions are intended for seed files only.
91 * Entropy devices and EGD sockets are handled in rand_unix.c */
92
93int RAND_load_file(const char *file, long bytes)
94 {
95 /* If bytes >= 0, read up to 'bytes' bytes.
96 * if bytes == -1, read complete file. */
97
98 MS_STATIC unsigned char buf[BUFSIZE];
99 struct stat sb;
100 int i,ret=0,n;
101 FILE *in;
102
103 if (file == NULL) return(0);
104
105 i=stat(file,&sb);
106 /* If the state fails, put some crap in anyway */
107 RAND_add(&sb,sizeof(sb),0);
108 if (i < 0) return(0);
109 if (bytes == 0) return(ret);
110
111 in=fopen(file,"rb");
112 if (in == NULL) goto err;
113#if defined(S_IFBLK) && defined(S_IFCHR)
114 if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
115 /* this file is a device. we don't want read an infinite number
116 * of bytes from a random device, nor do we want to use buffered
117 * I/O because we will waste system entropy.
118 */
119 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
120 setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */
121 }
122#endif
123 for (;;)
124 {
125 if (bytes > 0)
126 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
127 else
128 n = BUFSIZE;
129 i=fread(buf,1,n,in);
130 if (i <= 0) break;
131 /* even if n != i, use the full array */
132 RAND_add(buf,n,i);
133 ret+=i;
134 if (bytes > 0)
135 {
136 bytes-=n;
137 if (bytes <= 0) break;
138 }
139 }
140 fclose(in);
141 OPENSSL_cleanse(buf,BUFSIZE);
142err:
143 return(ret);
144 }
145
146int RAND_write_file(const char *file)
147 {
148 unsigned char buf[BUFSIZE];
149 int i,ret=0,rand_err=0;
150 FILE *out = NULL;
151 int n;
152 struct stat sb;
153
154 i=stat(file,&sb);
155 if (i != -1) {
156#if defined(S_IFBLK) && defined(S_IFCHR)
157 if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
158 /* this file is a device. we don't write back to it.
159 * we "succeed" on the assumption this is some sort
160 * of random device. Otherwise attempting to write to
161 * and chmod the device causes problems.
162 */
163 return(1);
164 }
165#endif
166 }
167
168#if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32)
169 {
170 /* For some reason Win32 can't write to files created this way */
171
172 /* chmod(..., 0600) is too late to protect the file,
173 * permissions should be restrictive from the start */
174 int fd = open(file, O_CREAT, 0600);
175 if (fd != -1)
176 out = fdopen(fd, "wb");
177 }
178#endif
179 if (out == NULL)
180 out = fopen(file,"wb");
181 if (out == NULL) goto err;
182
183#ifndef NO_CHMOD
184 chmod(file,0600);
185#endif
186 n=RAND_DATA;
187 for (;;)
188 {
189 i=(n > BUFSIZE)?BUFSIZE:n;
190 n-=BUFSIZE;
191 if (RAND_bytes(buf,i) <= 0)
192 rand_err=1;
193 i=fwrite(buf,1,i,out);
194 if (i <= 0)
195 {
196 ret=0;
197 break;
198 }
199 ret+=i;
200 if (n <= 0) break;
201 }
202#ifdef OPENSSL_SYS_VMS
203 /* Try to delete older versions of the file, until there aren't
204 any */
205 {
206 char *tmpf;
207
208 tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */
209 if (tmpf)
210 {
211 strcpy(tmpf, file);
212 strcat(tmpf, ";-1");
213 while(delete(tmpf) == 0)
214 ;
215 rename(file,";1"); /* Make sure it's version 1, or we
216 will reach the limit (32767) at
217 some point... */
218 }
219 }
220#endif /* OPENSSL_SYS_VMS */
221
222 fclose(out);
223 OPENSSL_cleanse(buf,BUFSIZE);
224err:
225 return (rand_err ? -1 : ret);
226 }
227
228const char *RAND_file_name(char *buf, size_t size)
229 {
230 char *s=NULL;
231 int ok = 0;
232#ifdef __OpenBSD__
233 struct stat sb;
234#endif
235
236 if (issetugid() == 0)
237 s=getenv("RANDFILE");
238 if (s != NULL && *s && strlen(s) + 1 < size)
239 {
240 if (BUF_strlcpy(buf,s,size) >= size)
241 return NULL;
242 }
243 else
244 {
245 if (issetugid() == 0)
246 s=getenv("HOME");
247#ifdef DEFAULT_HOME
248 if (s == NULL)
249 {
250 s = DEFAULT_HOME;
251 }
252#endif
253 if (s && *s && strlen(s)+strlen(RFILE)+2 < size)
254 {
255 BUF_strlcpy(buf,s,size);
256#ifndef OPENSSL_SYS_VMS
257 BUF_strlcat(buf,"/",size);
258#endif
259 BUF_strlcat(buf,RFILE,size);
260 ok = 1;
261 }
262 else
263 buf[0] = '\0'; /* no file name */
264 }
265
266#ifdef __OpenBSD__
267 /* given that all random loads just fail if the file can't be
268 * seen on a stat, we stat the file we're returning, if it
269 * fails, use /dev/arandom instead. this allows the user to
270 * use their own source for good random data, but defaults
271 * to something hopefully decent if that isn't available.
272 */
273
274 if (!ok)
275 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
276 return(NULL);
277 }
278 if (stat(buf,&sb) == -1)
279 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
280 return(NULL);
281 }
282
283#endif
284 return(buf);
285 }
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