-/* crypto/rand/randfile.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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 <memory.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include "e_os.h"
-#include "rand.h"
+
+#include <openssl/crypto.h>
+#include <openssl/rand.h>
+#include <openssl/buffer.h>
+
+#ifdef OPENSSL_SYS_VMS
+# include <unixio.h>
+#endif
+#ifndef NO_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifndef OPENSSL_NO_POSIX_IO
+# include <sys/stat.h>
+# include <fcntl.h>
+/*
+ * 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_ISBLK)
+# if defined(_S_IFBLK)
+# define S_ISBLK(m) ((m) & _S_IFBLK)
+# elif defined(S_IFBLK)
+# define S_ISBLK(m) ((m) & S_IFBLK)
+# elif defined(_WIN32)
+# define S_ISBLK(m) 0 /* no concept of block devices on Windows */
+# endif
+# endif
+# if !defined(S_ISCHR)
+# if defined(_S_IFCHR)
+# define S_ISCHR(m) ((m) & _S_IFCHR)
+# elif defined(S_IFCHR)
+# define S_ISCHR(m) ((m) & S_IFCHR)
+# endif
+# endif
+#endif
+
+#ifdef _WIN32
+# define stat _stat
+# define chmod _chmod
+# define open _open
+# define fdopen _fdopen
+# define fstat _fstat
+# define fileno _fileno
+#endif
#undef BUFSIZE
-#define BUFSIZE 1024
+#define BUFSIZE 1024
#define RAND_DATA 1024
-/* #define RFILE ".rand" - defined in ../../e_os.h */
-
-int RAND_load_file(file,bytes)
-const char *file;
-long bytes;
- {
- MS_STATIC unsigned char buf[BUFSIZE];
- struct stat sb;
- int i,ret=0,n;
- FILE *in;
-
- if (file == NULL) return(0);
-
- i=stat(file,&sb);
- /* If the state fails, put some crap in anyway */
- RAND_seed((unsigned char *)&sb,sizeof(sb));
- ret+=sizeof(sb);
- if (i < 0) return(0);
- if (bytes <= 0) return(ret);
-
- in=fopen(file,"rb");
- if (in == NULL) goto err;
- for (;;)
- {
- n=(bytes < BUFSIZE)?(int)bytes:BUFSIZE;
- i=fread(buf,1,n,in);
- if (i <= 0) break;
- /* even if n != i, use the full array */
- RAND_seed(buf,n);
- ret+=i;
- bytes-=n;
- if (bytes <= 0) break;
- }
- fclose(in);
- memset(buf,0,BUFSIZE);
-err:
- return(ret);
- }
-
-int RAND_write_file(file)
-const char *file;
- {
- unsigned char buf[BUFSIZE];
- int i,ret=0;
- FILE *out;
- int n;
-
- out=fopen(file,"w");
- if (out == NULL) goto err;
- chmod(file,0600);
- n=RAND_DATA;
- for (;;)
- {
- i=(n > BUFSIZE)?BUFSIZE:n;
- n-=BUFSIZE;
- RAND_bytes(buf,i);
- i=fwrite(buf,1,i,out);
- if (i <= 0)
- {
- ret=0;
- break;
- }
- ret+=i;
- if (n <= 0) break;
- }
- fclose(out);
- memset(buf,0,BUFSIZE);
-err:
- return(ret);
- }
-
-char *RAND_file_name(buf,size)
-char *buf;
-int size;
- {
- char *s;
- char *ret=NULL;
-
- s=getenv("RANDFILE");
- if (s != NULL)
- {
- strncpy(buf,s,size-1);
- buf[size-1]='\0';
- ret=buf;
- }
- else
- {
- s=getenv("HOME");
- if (s == NULL) return(RFILE);
- if (((int)(strlen(s)+strlen(RFILE)+2)) > size)
- return(RFILE);
- strcpy(buf,s);
- strcat(buf,"/");
- strcat(buf,RFILE);
- ret=buf;
- }
- return(ret);
- }
+#ifdef OPENSSL_SYS_VMS
+/*
+ * Misc hacks needed for specific cases.
+ *
+ * __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 function return this type (a study of stdio.h proves it).
+ * Additionally, we create a similar char pointer type for the sake of
+ * vms_setbuf below.
+ */
+# if __INITIAL_POINTER_SIZE == 64
+# pragma pointer_size save
+# pragma pointer_size 32
+typedef char *char_ptr32;
+# pragma pointer_size restore
+/*
+ * On VMS, setbuf() will only take 32-bit pointers, and a compilation
+ * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here.
+ * Since we know that the FILE* really is a 32-bit pointer expanded to
+ * 64 bits, we also know it's safe to convert it back to a 32-bit pointer.
+ * As for the buffer parameter, we only use NULL here, so that passes as
+ * well...
+ */
+# define setbuf(fp,buf) (setbuf)((__FILE_ptr32)(fp), (char_ptr32)(buf))
+# endif
+
+/*
+ * 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
+
+#define RFILE ".rnd"
+
+/*
+ * Note that these functions are intended for seed files only. Entropy
+ * devices and EGD sockets are handled in rand_unix.c
+ */
+
+int RAND_load_file(const char *file, long bytes)
+{
+ /*-
+ * If bytes >= 0, read up to 'bytes' bytes.
+ * if bytes == -1, read complete file.
+ */
+
+ unsigned char buf[BUFSIZE];
+#ifndef OPENSSL_NO_POSIX_IO
+ struct stat sb;
+#endif
+ int i, ret = 0, n;
+ FILE *in = NULL;
+
+ if (file == NULL)
+ return 0;
+
+ if (bytes == 0)
+ return ret;
+
+ in = openssl_fopen(file, "rb");
+ if (in == NULL)
+ goto err;
+
+#ifndef OPENSSL_NO_POSIX_IO
+ /*
+ * struct stat can have padding and unused fields that may not be
+ * initialized in the call to stat(). We need to clear the entire
+ * structure before calling RAND_add() to avoid complaints from
+ * applications such as Valgrind.
+ */
+ memset(&sb, 0, sizeof(sb));
+ if (fstat(fileno(in), &sb) < 0)
+ goto err;
+ RAND_add(&sb, sizeof(sb), 0.0);
+
+# if defined(S_ISBLK) && defined(S_ISCHR)
+ if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
+ /*
+ * this file is a device. we don't want read an infinite number of
+ * bytes from a random device, nor do we want to use buffered I/O
+ * because we will waste system entropy.
+ */
+ bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
+ setbuf(in, NULL); /* don't do buffered reads */
+ }
+# endif
+#endif
+ for (;;) {
+ if (bytes > 0)
+ n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
+ else
+ n = BUFSIZE;
+ i = fread(buf, 1, n, in);
+ if (i <= 0)
+ break;
+
+ RAND_add(buf, i, (double)i);
+ ret += i;
+ if (bytes > 0) {
+ bytes -= n;
+ if (bytes <= 0)
+ break;
+ }
+ }
+ OPENSSL_cleanse(buf, BUFSIZE);
+ err:
+ if (in != NULL)
+ fclose(in);
+ return ret;
+}
+
+int RAND_write_file(const char *file)
+{
+ unsigned char buf[BUFSIZE];
+ int i, ret = 0, rand_err = 0;
+ FILE *out = NULL;
+ int n;
+#ifndef OPENSSL_NO_POSIX_IO
+ struct stat sb;
+
+# if defined(S_ISBLK) && defined(S_ISCHR)
+# ifdef _WIN32
+ /*
+ * Check for |file| being a driver as "ASCII-safe" on Windows,
+ * because driver paths are always ASCII.
+ */
+# endif
+ i = stat(file, &sb);
+ if (i != -1) {
+ if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
+ /*
+ * this file is a device. we don't write back to it. we
+ * "succeed" on the assumption this is some sort of random
+ * device. Otherwise attempting to write to and chmod the device
+ * causes problems.
+ */
+ return 1;
+ }
+# endif
+ }
+#endif
+
+#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)
+ goto err;
+
+#if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
+ chmod(file, 0600);
+#endif
+ n = RAND_DATA;
+ for (;;) {
+ i = (n > BUFSIZE) ? BUFSIZE : n;
+ n -= BUFSIZE;
+ if (RAND_bytes(buf, i) <= 0)
+ rand_err = 1;
+ i = fwrite(buf, 1, i, out);
+ if (i <= 0) {
+ ret = 0;
+ break;
+ }
+ ret += i;
+ if (n <= 0)
+ break;
+ }
+
+ fclose(out);
+ OPENSSL_cleanse(buf, BUFSIZE);
+ err:
+ return (rand_err ? -1 : ret);
+}
+
+const char *RAND_file_name(char *buf, size_t size)
+{
+ char *s = NULL;
+ int use_randfile = 1;
+#ifdef __OpenBSD__
+ struct stat sb;
+#endif
+
+#if defined(_WIN32) && defined(CP_UTF8)
+ DWORD len;
+ WCHAR *var, *val;
+
+ if ((var = L"RANDFILE",
+ len = GetEnvironmentVariableW(var, NULL, 0)) == 0
+ && (var = L"HOME", use_randfile = 0,
+ len = GetEnvironmentVariableW(var, NULL, 0)) == 0
+ && (var = L"USERPROFILE",
+ len = GetEnvironmentVariableW(var, NULL, 0)) == 0) {
+ var = L"SYSTEMROOT",
+ len = GetEnvironmentVariableW(var, NULL, 0);
+ }
+
+ if (len != 0) {
+ int sz;
+
+ val = _alloca(len * sizeof(WCHAR));
+
+ if (GetEnvironmentVariableW(var, val, len) < len
+ && (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 {
+ s = getenv("RANDFILE");
+ if (s == 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) {
+ size_t len = strlen(s);
+
+ if (use_randfile && len + 1 < size) {
+ if (OPENSSL_strlcpy(buf, s, size) >= size)
+ return NULL;
+ } else if (len + strlen(RFILE) + 2 < size) {
+ OPENSSL_strlcpy(buf, s, size);
+#ifndef OPENSSL_SYS_VMS
+ OPENSSL_strlcat(buf, "/", size);
+#endif
+ OPENSSL_strlcat(buf, RFILE, size);
+ }
+ } else {
+ buf[0] = '\0'; /* no file name */
+ }
+
+#ifdef __OpenBSD__
+ /*
+ * given that all random loads just fail if the file can't be seen on a
+ * stat, we stat the file we're returning, if it fails, use /dev/arandom
+ * instead. this allows the user to use their own source for good random
+ * data, but defaults to something hopefully decent if that isn't
+ * available.
+ */
+
+ if (!buf[0] || stat(buf, &sb) == -1)
+ if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) {
+ return NULL;
+ }
+#endif
+ return buf;
+}
projects / openssl.git / blobdiff