1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
60 /* We need to define this to get macros like S_IFBLK and S_IFCHR */
61 #if !defined(OPENSSL_SYS_VXWORKS)
62 # define _XOPEN_SOURCE 500
70 #include <openssl/crypto.h>
71 #include <openssl/rand.h>
72 #include <openssl/buffer.h>
74 #ifdef OPENSSL_SYS_VMS
77 #ifndef NO_SYS_TYPES_H
78 # include <sys/types.h>
80 #ifndef OPENSSL_NO_POSIX_IO
81 # include <sys/stat.h>
89 # define fdopen _fdopen
94 #define RAND_DATA 1024
96 #ifdef OPENSSL_SYS_VMS
98 * This declaration is a nasty hack to get around vms' extension to fopen for
99 * passing in sharing options being disabled by our /STANDARD=ANSI89
101 static FILE *(*const vms_fopen)(const char *, const char *, ...) =
102 (FILE *(*)(const char *, const char *, ...))fopen;
103 # define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
106 /* #define RFILE ".rnd" - defined in ../../e_os.h */
109 * Note that these functions are intended for seed files only. Entropy
110 * devices and EGD sockets are handled in rand_unix.c
113 int RAND_load_file(const char *file, long bytes)
116 * If bytes >= 0, read up to 'bytes' bytes.
117 * if bytes == -1, read complete file.
120 unsigned char buf[BUFSIZE];
121 #ifndef OPENSSL_NO_POSIX_IO
130 #ifndef OPENSSL_NO_POSIX_IO
132 * struct stat can have padding and unused fields that may not be
133 * initialized in the call to stat(). We need to clear the entire
134 * structure before calling RAND_add() to avoid complaints from
135 * applications such as Valgrind.
137 memset(&sb, 0, sizeof(sb));
138 if (stat(file, &sb) < 0)
140 RAND_add(&sb, sizeof(sb), 0.0);
145 #ifdef OPENSSL_SYS_VMS
146 in = vms_fopen(file, "rb", VMS_OPEN_ATTRS);
148 in = fopen(file, "rb");
152 #if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPENSSL_NO_POSIX_IO)
153 if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
155 * this file is a device. we don't want read an infinite number of
156 * bytes from a random device, nor do we want to use buffered I/O
157 * because we will waste system entropy.
159 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
160 setbuf(stdin, NULL); /* don't do buffered reads */
165 n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
168 i = fread(buf, 1, n, in);
172 RAND_add(buf, i, (double)i);
181 OPENSSL_cleanse(buf, BUFSIZE);
186 int RAND_write_file(const char *file)
188 unsigned char buf[BUFSIZE];
189 int i, ret = 0, rand_err = 0;
192 #ifndef OPENSSL_NO_POSIX_IO
197 # if defined(S_ISBLK) && defined(S_ISCHR)
198 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
200 * this file is a device. we don't write back to it. we
201 * "succeed" on the assumption this is some sort of random
202 * device. Otherwise attempting to write to and chmod the device
211 #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS)
217 * chmod(..., 0600) is too late to protect the file, permissions
218 * should be restrictive from the start
220 int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
222 out = fdopen(fd, "wb");
226 #ifdef OPENSSL_SYS_VMS
228 * VMS NOTE: Prior versions of this routine created a _new_ version of
229 * the rand file for each call into this routine, then deleted all
230 * existing versions named ;-1, and finally renamed the current version
231 * as ';1'. Under concurrent usage, this resulted in an RMS race
232 * condition in rename() which could orphan files (see vms message help
233 * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
234 * the top-level version of the rand file. Note that there may still be
235 * conditions where the top-level rand file is locked. If so, this code
236 * will then create a new version of the rand file. Without the delete
237 * and rename code, this can result in ascending file versions that stop
238 * at version 32767, and this routine will then return an error. The
239 * remedy for this is to recode the calling application to avoid
240 * concurrent use of the rand file, or synchronize usage at the
241 * application level. Also consider whether or not you NEED a persistent
242 * rand file in a concurrent use situation.
245 out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS);
247 out = vms_fopen(file, "wb", VMS_OPEN_ATTRS);
250 out = fopen(file, "wb");
260 i = (n > BUFSIZE) ? BUFSIZE : n;
262 if (RAND_bytes(buf, i) <= 0)
264 i = fwrite(buf, 1, i, out);
275 OPENSSL_cleanse(buf, BUFSIZE);
277 return (rand_err ? -1 : ret);
280 const char *RAND_file_name(char *buf, size_t size)
287 if (OPENSSL_issetugid() == 0)
288 s = getenv("RANDFILE");
289 if (s != NULL && *s && strlen(s) + 1 < size) {
290 if (OPENSSL_strlcpy(buf, s, size) >= size)
293 if (OPENSSL_issetugid() == 0)
300 if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) {
301 OPENSSL_strlcpy(buf, s, size);
302 #ifndef OPENSSL_SYS_VMS
303 OPENSSL_strlcat(buf, "/", size);
305 OPENSSL_strlcat(buf, RFILE, size);
307 buf[0] = '\0'; /* no file name */
312 * given that all random loads just fail if the file can't be seen on a
313 * stat, we stat the file we're returning, if it fails, use /dev/arandom
314 * instead. this allows the user to use their own source for good random
315 * data, but defaults to something hopefully decent if that isn't
320 if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
323 if (stat(buf, &sb) == -1)
324 if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {