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
10 #include "internal/cryptlib.h"
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
61 # define fileno _fileno
66 #define RAND_DATA 1024
68 #ifdef OPENSSL_SYS_VMS
70 * Misc hacks needed for specific cases.
72 * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
73 * to make sure the FILE* is a 32-bit pointer no matter what. We know that
74 * stdio function return this type (a study of stdio.h proves it).
75 * Additionally, we create a similar char pointer type for the sake of
78 # if __INITIAL_POINTER_SIZE == 64
79 # pragma pointer_size save
80 # pragma pointer_size 32
81 typedef char *char_ptr32;
82 # pragma pointer_size restore
84 * On VMS, setbuf() will only take 32-bit pointers, and a compilation
85 * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
86 * Since we know that the FILE* really is a 32-bit pointer expanded to
87 * 64 bits, we also know it's safe to convert it back to a 32-bit pointer.
88 * As for the buffer parameter, we only use NULL here, so that passes as
91 # define setbuf(fp,buf) (setbuf)((__FILE_ptr32)(fp), (char_ptr32)(buf))
95 * This declaration is a nasty hack to get around vms' extension to fopen for
96 * passing in sharing options being disabled by /STANDARD=ANSI89
98 static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
99 (__FILE_ptr32 (*)(const char *, const char *, ...))fopen;
100 # define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
102 # define openssl_fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
108 * Note that these functions are intended for seed files only. Entropy
109 * devices and EGD sockets are handled in rand_unix.c
112 int RAND_load_file(const char *file, long bytes)
115 * If bytes >= 0, read up to 'bytes' bytes.
116 * if bytes == -1, read complete file.
119 unsigned char buf[BUFSIZE];
120 #ifndef OPENSSL_NO_POSIX_IO
132 in = openssl_fopen(file, "rb");
136 #ifndef OPENSSL_NO_POSIX_IO
138 * struct stat can have padding and unused fields that may not be
139 * initialized in the call to stat(). We need to clear the entire
140 * structure before calling RAND_add() to avoid complaints from
141 * applications such as Valgrind.
143 memset(&sb, 0, sizeof(sb));
144 if (fstat(fileno(in), &sb) < 0)
146 RAND_add(&sb, sizeof(sb), 0.0);
148 # if defined(S_ISBLK) && defined(S_ISCHR)
149 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
151 * this file is a device. we don't want read an infinite number of
152 * bytes from a random device, nor do we want to use buffered I/O
153 * because we will waste system entropy.
155 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
156 setbuf(in, NULL); /* don't do buffered reads */
162 n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
165 i = fread(buf, 1, n, in);
169 RAND_add(buf, i, (double)i);
177 OPENSSL_cleanse(buf, BUFSIZE);
184 int RAND_write_file(const char *file)
186 unsigned char buf[BUFSIZE];
187 int i, ret = 0, rand_err = 0;
190 #ifndef OPENSSL_NO_POSIX_IO
193 # if defined(S_ISBLK) && defined(S_ISCHR)
196 * Check for |file| being a driver as "ASCII-safe" on Windows,
197 * because driver paths are always ASCII.
202 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
204 * this file is a device. we don't write back to it. we
205 * "succeed" on the assumption this is some sort of random
206 * device. Otherwise attempting to write to and chmod the device
215 #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
216 !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
222 * chmod(..., 0600) is too late to protect the file, permissions
223 * should be restrictive from the start
225 int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
227 out = fdopen(fd, "wb");
231 #ifdef OPENSSL_SYS_VMS
233 * VMS NOTE: Prior versions of this routine created a _new_ version of
234 * the rand file for each call into this routine, then deleted all
235 * existing versions named ;-1, and finally renamed the current version
236 * as ';1'. Under concurrent usage, this resulted in an RMS race
237 * condition in rename() which could orphan files (see vms message help
238 * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
239 * the top-level version of the rand file. Note that there may still be
240 * conditions where the top-level rand file is locked. If so, this code
241 * will then create a new version of the rand file. Without the delete
242 * and rename code, this can result in ascending file versions that stop
243 * at version 32767, and this routine will then return an error. The
244 * remedy for this is to recode the calling application to avoid
245 * concurrent use of the rand file, or synchronize usage at the
246 * application level. Also consider whether or not you NEED a persistent
247 * rand file in a concurrent use situation.
250 out = openssl_fopen(file, "rb+");
253 out = openssl_fopen(file, "wb");
257 #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
262 i = (n > BUFSIZE) ? BUFSIZE : n;
264 if (RAND_bytes(buf, i) <= 0)
266 i = fwrite(buf, 1, i, out);
277 OPENSSL_cleanse(buf, BUFSIZE);
279 return (rand_err ? -1 : ret);
282 const char *RAND_file_name(char *buf, size_t size)
285 int use_randfile = 1;
290 #if defined(_WIN32) && defined(CP_UTF8)
294 if ((var = L"RANDFILE",
295 len = GetEnvironmentVariableW(var, NULL, 0)) == 0
296 && (var = L"HOME", use_randfile = 0,
297 len = GetEnvironmentVariableW(var, NULL, 0)) == 0
298 && (var = L"USERPROFILE",
299 len = GetEnvironmentVariableW(var, NULL, 0)) == 0) {
301 len = GetEnvironmentVariableW(var, NULL, 0);
307 val = _alloca(len * sizeof(WCHAR));
309 if (GetEnvironmentVariableW(var, val, len) < len
310 && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
313 if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz,
319 if (OPENSSL_issetugid() != 0) {
322 s = getenv("RANDFILE");
323 if (s == NULL || *s == '\0') {
330 if (!use_randfile && s == NULL) {
334 if (s != NULL && *s) {
335 size_t len = strlen(s);
337 if (use_randfile && len + 1 < size) {
338 if (OPENSSL_strlcpy(buf, s, size) >= size)
340 } else if (len + strlen(RFILE) + 2 < size) {
341 OPENSSL_strlcpy(buf, s, size);
342 #ifndef OPENSSL_SYS_VMS
343 OPENSSL_strlcat(buf, "/", size);
345 OPENSSL_strlcat(buf, RFILE, size);
348 buf[0] = '\0'; /* no file name */
353 * given that all random loads just fail if the file can't be seen on a
354 * stat, we stat the file we're returning, if it fails, use /dev/arandom
355 * instead. this allows the user to use their own source for good random
356 * data, but defaults to something hopefully decent if that isn't
360 if (!buf[0] || stat(buf, &sb) == -1)
361 if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
365 return buf[0] ? buf : NULL;