2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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 #if defined (__TANDEM) && defined (_SPT_MODEL_)
12 * These definitions have to come first in SPT due to scoping of the
13 * declarations in c99 associated with SPT use of stat.
15 # include <sys/types.h>
16 # include <sys/stat.h>
19 #include "internal/cryptlib.h"
26 #include <openssl/crypto.h>
27 #include <openssl/rand.h>
28 #include <openssl/buffer.h>
30 #ifdef OPENSSL_SYS_VMS
33 #include <sys/types.h>
34 #ifndef OPENSSL_NO_POSIX_IO
35 # include <sys/stat.h>
37 # if defined(_WIN32) && !defined(_WIN32_WCE)
43 # define fdopen _fdopen
45 # define fileno _fileno
50 * Following should not be needed, and we could have been stricter
51 * and demand S_IS*. But some systems just don't comply... Formally
52 * below macros are "anatomically incorrect", because normally they
53 * would look like ((m) & MASK == TYPE), but since MASK availability
54 * is as questionable, we settle for this poor-man fallback...
56 # if !defined(S_ISREG)
57 # define S_ISREG(m) ((m) & S_IFREG)
60 #define RAND_BUF_SIZE 1024
63 #ifdef OPENSSL_SYS_VMS
65 * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
66 * to make sure the FILE* is a 32-bit pointer no matter what. We know that
67 * stdio functions return this type (a study of stdio.h proves it).
69 * This declaration is a nasty hack to get around vms' extension to fopen for
70 * passing in sharing options being disabled by /STANDARD=ANSI89
72 static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
73 (__FILE_ptr32 (*)(const char *, const char *, ...))fopen;
74 # define VMS_OPEN_ATTRS \
75 "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
76 # define openssl_fopen(fname, mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
80 * Note that these functions are intended for seed files only. Entropy
81 * devices and EGD sockets are handled in rand_unix.c If |bytes| is
82 * -1 read the complete file; otherwise read the specified amount.
84 int RAND_load_file(const char *file, long bytes)
87 * The load buffer size exceeds the chunk size by the comfortable amount
88 * of 'RAND_DRBG_STRENGTH' bytes (not bits!). This is done on purpose
89 * to avoid calling RAND_add() with a small final chunk. Instead, such
90 * a small final chunk will be added together with the previous chunk
91 * (unless it's the only one).
93 #define RAND_LOAD_BUF_SIZE (RAND_BUF_SIZE + RAND_DRBG_STRENGTH)
94 unsigned char buf[RAND_LOAD_BUF_SIZE];
96 #ifndef OPENSSL_NO_POSIX_IO
105 if ((in = openssl_fopen(file, "rb")) == NULL) {
106 ERR_raise_data(ERR_LIB_RAND, RAND_R_CANNOT_OPEN_FILE,
107 "Filename=%s", file);
111 #ifndef OPENSSL_NO_POSIX_IO
112 if (fstat(fileno(in), &sb) < 0) {
113 ERR_raise_data(ERR_LIB_RAND, RAND_R_INTERNAL_ERROR,
114 "Filename=%s", file);
120 if (S_ISREG(sb.st_mode))
123 bytes = RAND_DRBG_STRENGTH;
127 * On VMS, setbuf() will only take 32-bit pointers, and a compilation
128 * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
129 * However, we trust that the C RTL will never give us a FILE pointer
130 * above the first 4 GB of memory, so we simply turn off the warning
133 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
134 # pragma environment save
135 # pragma message disable maylosedata2
138 * Don't buffer, because even if |file| is regular file, we have
139 * no control over the buffer, so why would we want a copy of its
140 * contents lying around?
143 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
144 # pragma environment restore
149 n = (bytes <= RAND_LOAD_BUF_SIZE) ? (int)bytes : RAND_BUF_SIZE;
151 n = RAND_LOAD_BUF_SIZE;
152 i = fread(buf, 1, n, in);
154 if (ferror(in) && errno == EINTR) {
163 RAND_add(buf, i, (double)i);
166 /* If given a bytecount, and we did it, break. */
167 if (bytes > 0 && (bytes -= i) <= 0)
171 OPENSSL_cleanse(buf, sizeof(buf));
173 if (!RAND_status()) {
174 ERR_raise_data(ERR_LIB_RAND, RAND_R_RESEED_ERROR, "Filename=%s", file);
181 int RAND_write_file(const char *file)
183 unsigned char buf[RAND_BUF_SIZE];
186 #ifndef OPENSSL_NO_POSIX_IO
189 if (stat(file, &sb) >= 0 && !S_ISREG(sb.st_mode)) {
190 ERR_raise_data(ERR_LIB_RAND, RAND_R_NOT_A_REGULAR_FILE,
191 "Filename=%s", file);
196 /* Collect enough random data. */
197 if (RAND_priv_bytes(buf, (int)sizeof(buf)) != 1)
200 #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
201 !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
207 * chmod(..., 0600) is too late to protect the file, permissions
208 * should be restrictive from the start
210 int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
212 out = fdopen(fd, "wb");
216 #ifdef OPENSSL_SYS_VMS
218 * VMS NOTE: Prior versions of this routine created a _new_ version of
219 * the rand file for each call into this routine, then deleted all
220 * existing versions named ;-1, and finally renamed the current version
221 * as ';1'. Under concurrent usage, this resulted in an RMS race
222 * condition in rename() which could orphan files (see vms message help
223 * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
224 * the top-level version of the rand file. Note that there may still be
225 * conditions where the top-level rand file is locked. If so, this code
226 * will then create a new version of the rand file. Without the delete
227 * and rename code, this can result in ascending file versions that stop
228 * at version 32767, and this routine will then return an error. The
229 * remedy for this is to recode the calling application to avoid
230 * concurrent use of the rand file, or synchronize usage at the
231 * application level. Also consider whether or not you NEED a persistent
232 * rand file in a concurrent use situation.
234 out = openssl_fopen(file, "rb+");
238 out = openssl_fopen(file, "wb");
240 ERR_raise_data(ERR_LIB_RAND, RAND_R_CANNOT_OPEN_FILE,
241 "Filename=%s", file);
245 #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
247 * Yes it's late to do this (see above comment), but better than nothing.
252 ret = fwrite(buf, 1, RAND_BUF_SIZE, out);
254 OPENSSL_cleanse(buf, RAND_BUF_SIZE);
258 const char *RAND_file_name(char *buf, size_t size)
262 int use_randfile = 1;
264 #if defined(_WIN32) && defined(CP_UTF8) && !defined(_WIN32_WCE)
268 /* Look up various environment variables. */
269 if ((envlen = GetEnvironmentVariableW(var = L"RANDFILE", NULL, 0)) == 0) {
271 if ((envlen = GetEnvironmentVariableW(var = L"HOME", NULL, 0)) == 0
272 && (envlen = GetEnvironmentVariableW(var = L"USERPROFILE",
274 envlen = GetEnvironmentVariableW(var = L"SYSTEMROOT", NULL, 0);
277 /* If we got a value, allocate space to hold it and then get it. */
280 WCHAR *val = _alloca(envlen * sizeof(WCHAR));
282 if (GetEnvironmentVariableW(var, val, envlen) < envlen
283 && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
286 if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz,
292 if ((s = ossl_safe_getenv("RANDFILE")) == NULL || *s == '\0') {
294 s = ossl_safe_getenv("HOME");
299 if (!use_randfile && s == NULL)
302 if (s == NULL || *s == '\0')
311 if (len + 1 + strlen(RFILE) + 1 >= size)
314 #ifndef OPENSSL_SYS_VMS