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- /*
- * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #include "internal/cryptlib.h"
- #include <errno.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <openssl/crypto.h>
- #include <openssl/rand.h>
- #include <openssl/buffer.h>
- #ifdef OPENSSL_SYS_VMS
- # include <unixio.h>
- #endif
- #include <sys/types.h>
- #ifndef OPENSSL_NO_POSIX_IO
- # include <sys/stat.h>
- # include <fcntl.h>
- # ifdef _WIN32
- # include <windows.h>
- # include <io.h>
- # define stat _stat
- # define chmod _chmod
- # define open _open
- # define fdopen _fdopen
- # define fstat _fstat
- # define fileno _fileno
- # endif
- #endif
- /*
- * Following should not be needed, and we could have been stricter
- * and demand S_IS*. But some systems just don't comply... Formally
- * below macros are "anatomically incorrect", because normally they
- * would look like ((m) & MASK == TYPE), but since MASK availability
- * is as questionable, we settle for this poor-man fallback...
- */
- # if !defined(S_ISREG)
- # define S_ISREG(m) ((m) & S_IFREG)
- # endif
- #define RAND_FILE_SIZE 1024
- #define RFILE ".rnd"
- #ifdef OPENSSL_SYS_VMS
- /*
- * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically)
- * to make sure the FILE* is a 32-bit pointer no matter what. We know that
- * stdio functions return this type (a study of stdio.h proves it).
- *
- * This declaration is a nasty hack to get around vms' extension to fopen for
- * passing in sharing options being disabled by /STANDARD=ANSI89
- */
- static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) =
- (__FILE_ptr32 (*)(const char *, const char *, ...))fopen;
- # define VMS_OPEN_ATTRS \
- "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
- # define openssl_fopen(fname, mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS)
- #endif
- /*
- * Note that these functions are intended for seed files only. Entropy
- * devices and EGD sockets are handled in rand_unix.c If |bytes| is
- * -1 read the complete file; otherwise read the specified amount.
- */
- int RAND_load_file(const char *file, long bytes)
- {
- unsigned char buf[RAND_FILE_SIZE];
- #ifndef OPENSSL_NO_POSIX_IO
- struct stat sb;
- #endif
- int i, n, ret = 0;
- FILE *in;
- if (bytes == 0)
- return 0;
- if ((in = openssl_fopen(file, "rb")) == NULL) {
- RANDerr(RAND_F_RAND_LOAD_FILE, RAND_R_CANNOT_OPEN_FILE);
- ERR_add_error_data(2, "Filename=", file);
- return -1;
- }
- #ifndef OPENSSL_NO_POSIX_IO
- if (fstat(fileno(in), &sb) < 0) {
- RANDerr(RAND_F_RAND_LOAD_FILE, RAND_R_INTERNAL_ERROR);
- ERR_add_error_data(2, "Filename=", file);
- fclose(in);
- return -1;
- }
- if (!S_ISREG(sb.st_mode) && bytes < 0)
- bytes = 256;
- #endif
- /*
- * On VMS, setbuf() will only take 32-bit pointers, and a compilation
- * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
- * However, we trust that the C RTL will never give us a FILE pointer
- * above the first 4 GB of memory, so we simply turn off the warning
- * temporarily.
- */
- #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
- # pragma environment save
- # pragma message disable maylosedata2
- #endif
- /*
- * Don't buffer, because even if |file| is regular file, we have
- * no control over the buffer, so why would we want a copy of its
- * contents lying around?
- */
- setbuf(in, NULL);
- #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
- # pragma environment restore
- #endif
- for ( ; ; ) {
- if (bytes > 0)
- n = (bytes < RAND_FILE_SIZE) ? (int)bytes : RAND_FILE_SIZE;
- else
- n = RAND_FILE_SIZE;
- i = fread(buf, 1, n, in);
- #ifdef EINTR
- if (ferror(in) && errno == EINTR){
- clearerr(in);
- if (i == 0)
- continue;
- }
- #endif
- if (i == 0)
- break;
- RAND_add(buf, i, (double)i);
- ret += i;
- /* If given a bytecount, and we did it, break. */
- if (bytes > 0 && (bytes -= i) <= 0)
- break;
- }
- OPENSSL_cleanse(buf, sizeof(buf));
- fclose(in);
- return ret;
- }
- int RAND_write_file(const char *file)
- {
- unsigned char buf[RAND_FILE_SIZE];
- int ret = -1;
- FILE *out = NULL;
- #ifndef OPENSSL_NO_POSIX_IO
- struct stat sb;
- if (stat(file, &sb) >= 0 && !S_ISREG(sb.st_mode)) {
- RANDerr(RAND_F_RAND_WRITE_FILE, RAND_R_NOT_A_REGULAR_FILE);
- ERR_add_error_data(2, "Filename=", file);
- return -1;
- }
- #endif
- /* Collect enough random data. */
- if (RAND_priv_bytes(buf, (int)sizeof(buf)) != 1)
- return -1;
- #if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
- !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
- {
- # ifndef O_BINARY
- # define O_BINARY 0
- # endif
- /*
- * chmod(..., 0600) is too late to protect the file, permissions
- * should be restrictive from the start
- */
- int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
- if (fd != -1)
- out = fdopen(fd, "wb");
- }
- #endif
- #ifdef OPENSSL_SYS_VMS
- /*
- * VMS NOTE: Prior versions of this routine created a _new_ version of
- * the rand file for each call into this routine, then deleted all
- * existing versions named ;-1, and finally renamed the current version
- * as ';1'. Under concurrent usage, this resulted in an RMS race
- * condition in rename() which could orphan files (see vms message help
- * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
- * the top-level version of the rand file. Note that there may still be
- * conditions where the top-level rand file is locked. If so, this code
- * will then create a new version of the rand file. Without the delete
- * and rename code, this can result in ascending file versions that stop
- * at version 32767, and this routine will then return an error. The
- * remedy for this is to recode the calling application to avoid
- * concurrent use of the rand file, or synchronize usage at the
- * application level. Also consider whether or not you NEED a persistent
- * rand file in a concurrent use situation.
- */
- out = openssl_fopen(file, "rb+");
- #endif
- if (out == NULL)
- out = openssl_fopen(file, "wb");
- if (out == NULL) {
- RANDerr(RAND_F_RAND_WRITE_FILE, RAND_R_CANNOT_OPEN_FILE);
- ERR_add_error_data(2, "Filename=", file);
- return -1;
- }
- #if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
- /*
- * Yes it's late to do this (see above comment), but better than nothing.
- */
- chmod(file, 0600);
- #endif
- ret = fwrite(buf, 1, RAND_FILE_SIZE, out);
- fclose(out);
- OPENSSL_cleanse(buf, RAND_FILE_SIZE);
- return ret;
- }
- const char *RAND_file_name(char *buf, size_t size)
- {
- char *s = NULL;
- size_t len;
- int use_randfile = 1;
- #if defined(_WIN32) && defined(CP_UTF8)
- DWORD envlen;
- WCHAR *var;
- /* Look up various environment variables. */
- if ((envlen = GetEnvironmentVariableW(var = L"RANDFILE", NULL, 0)) == 0) {
- use_randfile = 0;
- if ((envlen = GetEnvironmentVariableW(var = L"HOME", NULL, 0)) == 0
- && (envlen = GetEnvironmentVariableW(var = L"USERPROFILE",
- NULL, 0)) == 0)
- envlen = GetEnvironmentVariableW(var = L"SYSTEMROOT", NULL, 0);
- }
- /* If we got a value, allocate space to hold it and then get it. */
- if (envlen != 0) {
- int sz;
- WCHAR *val = _alloca(envlen * sizeof(WCHAR));
- if (GetEnvironmentVariableW(var, val, envlen) < envlen
- && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
- NULL, NULL)) != 0) {
- s = _alloca(sz);
- if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz,
- NULL, NULL) == 0)
- s = NULL;
- }
- }
- #else
- if (OPENSSL_issetugid() != 0) {
- use_randfile = 0;
- } else if ((s = getenv("RANDFILE")) == NULL || *s == '\0') {
- use_randfile = 0;
- s = getenv("HOME");
- }
- #endif
- #ifdef DEFAULT_HOME
- if (!use_randfile && s == NULL)
- s = DEFAULT_HOME;
- #endif
- if (s == NULL || *s == '\0')
- return NULL;
- len = strlen(s);
- if (use_randfile) {
- if (len + 1 >= size)
- return NULL;
- strcpy(buf, s);
- } else {
- if (len + 1 + strlen(RFILE) + 1 >= size)
- return NULL;
- strcpy(buf, s);
- #ifndef OPENSSL_SYS_VMS
- strcat(buf, "/");
- #endif
- strcat(buf, RFILE);
- }
- return buf;
- }
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