2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
17 #include <openssl/crypto.h>
18 #include <openssl/rand.h>
19 #include <openssl/buffer.h>
21 #ifdef OPENSSL_SYS_VMS
24 #ifndef NO_SYS_TYPES_H
25 # include <sys/types.h>
27 #ifndef OPENSSL_NO_POSIX_IO
28 # include <sys/stat.h>
31 * Following should not be needed, and we could have been stricter
32 * and demand S_IS*. But some systems just don't comply... Formally
33 * below macros are "anatomically incorrect", because normally they
34 * would look like ((m) & MASK == TYPE), but since MASK availability
35 * is as questionable, we settle for this poor-man fallback...
37 # if !defined(S_ISBLK)
38 # if defined(_S_IFBLK)
39 # define S_ISBLK(m) ((m) & _S_IFBLK)
40 # elif defined(S_IFBLK)
41 # define S_ISBLK(m) ((m) & S_IFBLK)
42 # elif defined(_WIN32)
43 # define S_ISBLK(m) 0 /* no concept of block devices on Windows */
46 # if !defined(S_ISCHR)
47 # if defined(_S_IFCHR)
48 # define S_ISCHR(m) ((m) & _S_IFCHR)
49 # elif defined(S_IFCHR)
50 # define S_ISCHR(m) ((m) & S_IFCHR)
59 # define fdopen _fdopen
64 #define RAND_DATA 1024
66 #ifdef OPENSSL_SYS_VMS
68 * This declaration is a nasty hack to get around vms' extension to fopen for
69 * passing in sharing options being disabled by our /STANDARD=ANSI89
71 static FILE *(*const vms_fopen)(const char *, const char *, ...) =
72 (FILE *(*)(const char *, const char *, ...))fopen;
73 # define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
79 * Note that these functions are intended for seed files only. Entropy
80 * devices and EGD sockets are handled in rand_unix.c
83 int RAND_load_file(const char *file, long bytes)
86 * If bytes >= 0, read up to 'bytes' bytes.
87 * if bytes == -1, read complete file.
90 unsigned char buf[BUFSIZE];
91 #ifndef OPENSSL_NO_POSIX_IO
100 #ifndef OPENSSL_NO_POSIX_IO
102 * struct stat can have padding and unused fields that may not be
103 * initialized in the call to stat(). We need to clear the entire
104 * structure before calling RAND_add() to avoid complaints from
105 * applications such as Valgrind.
107 memset(&sb, 0, sizeof(sb));
108 if (stat(file, &sb) < 0)
110 RAND_add(&sb, sizeof(sb), 0.0);
115 #ifdef OPENSSL_SYS_VMS
116 in = vms_fopen(file, "rb", VMS_OPEN_ATTRS);
118 in = fopen(file, "rb");
122 #if defined(S_ISBLK) && defined(S_ISCHR) && !defined(OPENSSL_NO_POSIX_IO)
123 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
125 * this file is a device. we don't want read an infinite number of
126 * bytes from a random device, nor do we want to use buffered I/O
127 * because we will waste system entropy.
129 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
130 setbuf(in, NULL); /* don't do buffered reads */
135 n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
138 i = fread(buf, 1, n, in);
142 RAND_add(buf, i, (double)i);
151 OPENSSL_cleanse(buf, BUFSIZE);
156 int RAND_write_file(const char *file)
158 unsigned char buf[BUFSIZE];
159 int i, ret = 0, rand_err = 0;
162 #ifndef OPENSSL_NO_POSIX_IO
167 # if defined(S_ISBLK) && defined(S_ISCHR)
168 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
170 * this file is a device. we don't write back to it. we
171 * "succeed" on the assumption this is some sort of random
172 * device. Otherwise attempting to write to and chmod the device
181 #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS)
187 * chmod(..., 0600) is too late to protect the file, permissions
188 * should be restrictive from the start
190 int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
192 out = fdopen(fd, "wb");
196 #ifdef OPENSSL_SYS_VMS
198 * VMS NOTE: Prior versions of this routine created a _new_ version of
199 * the rand file for each call into this routine, then deleted all
200 * existing versions named ;-1, and finally renamed the current version
201 * as ';1'. Under concurrent usage, this resulted in an RMS race
202 * condition in rename() which could orphan files (see vms message help
203 * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
204 * the top-level version of the rand file. Note that there may still be
205 * conditions where the top-level rand file is locked. If so, this code
206 * will then create a new version of the rand file. Without the delete
207 * and rename code, this can result in ascending file versions that stop
208 * at version 32767, and this routine will then return an error. The
209 * remedy for this is to recode the calling application to avoid
210 * concurrent use of the rand file, or synchronize usage at the
211 * application level. Also consider whether or not you NEED a persistent
212 * rand file in a concurrent use situation.
215 out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS);
217 out = vms_fopen(file, "wb", VMS_OPEN_ATTRS);
220 out = fopen(file, "wb");
225 #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
230 i = (n > BUFSIZE) ? BUFSIZE : n;
232 if (RAND_bytes(buf, i) <= 0)
234 i = fwrite(buf, 1, i, out);
245 OPENSSL_cleanse(buf, BUFSIZE);
247 return (rand_err ? -1 : ret);
250 const char *RAND_file_name(char *buf, size_t size)
257 if (OPENSSL_issetugid() == 0)
258 s = getenv("RANDFILE");
259 if (s != NULL && *s && strlen(s) + 1 < size) {
260 if (OPENSSL_strlcpy(buf, s, size) >= size)
263 if (OPENSSL_issetugid() == 0)
270 if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) {
271 OPENSSL_strlcpy(buf, s, size);
272 #ifndef OPENSSL_SYS_VMS
273 OPENSSL_strlcat(buf, "/", size);
275 OPENSSL_strlcat(buf, RFILE, size);
277 buf[0] = '\0'; /* no file name */
282 * given that all random loads just fail if the file can't be seen on a
283 * stat, we stat the file we're returning, if it fails, use /dev/arandom
284 * instead. this allows the user to use their own source for good random
285 * data, but defaults to something hopefully decent if that isn't
290 if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
293 if (stat(buf, &sb) == -1)
294 if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {