sl@0: /* crypto/rand/randfile.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: /* We need to define this to get macros like S_IFBLK and S_IFCHR */
sl@0: #define _XOPEN_SOURCE 500
sl@0: 
sl@0: 
sl@0: 
sl@0: #include <errno.h>
sl@0: #include <stdio.h>
sl@0: #include <stdlib.h>
sl@0: #include <string.h>
sl@0: 
sl@0: 
sl@0: #include "e_os.h"
sl@0: #include <openssl/crypto.h>
sl@0: #include <openssl/rand.h>
sl@0: #include <openssl/buffer.h>
sl@0: 
sl@0: # include <sys/types.h>
sl@0: 
sl@0: #ifdef OPENSSL_SYS_VMS
sl@0: #include <unixio.h>
sl@0: #endif
sl@0: #ifndef NO_SYS_TYPES_H
sl@0: # include <sys/types.h>
sl@0: #endif
sl@0: #ifdef MAC_OS_pre_X
sl@0: # include <stat.h>
sl@0: #else
sl@0: # include <sys/stat.h>
sl@0: #endif
sl@0: 
sl@0: #undef BUFSIZE
sl@0: #ifndef SYMBIAN
sl@0: #define BUFSIZE	1024
sl@0: #define RAND_DATA 1024
sl@0: #else
sl@0: #define BUFSIZE	512
sl@0: #define RAND_DATA 512
sl@0: #endif
sl@0: 
sl@0: 
sl@0: /* #define RFILE ".rnd" - defined in ../../e_os.h */
sl@0: 
sl@0: /* Note that these functions are intended for seed files only.
sl@0:  * Entropy devices and EGD sockets are handled in rand_unix.c */
sl@0: 
sl@0: EXPORT_C int RAND_load_file(const char *file, long bytes)
sl@0: 	{
sl@0: 	/* If bytes >= 0, read up to 'bytes' bytes.
sl@0: 	 * if bytes == -1, read complete file. */
sl@0: 
sl@0: 	MS_STATIC unsigned char buf[BUFSIZE];
sl@0: 	struct stat sb;
sl@0: 	int i,ret=0,n;
sl@0: 	FILE *in;
sl@0: 
sl@0: 	if (file == NULL) return(0);
sl@0: 
sl@0: 	if (stat(file,&sb) < 0) return(0);
sl@0: 	RAND_add(&sb,sizeof(sb),0.0);
sl@0: 	if (bytes == 0) return(ret);
sl@0: 
sl@0: 	in=fopen(file,"rb");
sl@0: 	if (in == NULL) goto err;
sl@0: #if defined(S_IFBLK) && defined(S_IFCHR)
sl@0: 	if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
sl@0: 	  /* this file is a device. we don't want read an infinite number
sl@0: 	   * of bytes from a random device, nor do we want to use buffered
sl@0: 	   * I/O because we will waste system entropy. 
sl@0: 	   */
sl@0: 	  bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
sl@0: 	  setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */
sl@0: 	}
sl@0: #endif
sl@0: 	for (;;)
sl@0: 		{
sl@0: 		if (bytes > 0)
sl@0: 			n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
sl@0: 		else
sl@0: 			n = BUFSIZE;
sl@0: 		i=fread(buf,1,n,in);
sl@0: 		if (i <= 0) break;
sl@0: 		/* even if n != i, use the full array */
sl@0: 		RAND_add(buf,n,(double)i);
sl@0: 		ret+=i;
sl@0: 		if (bytes > 0)
sl@0: 			{
sl@0: 			bytes-=n;
sl@0: 			if (bytes <= 0) break;
sl@0: 			}
sl@0: 		}
sl@0: 	fclose(in);
sl@0: 	OPENSSL_cleanse(buf,BUFSIZE);
sl@0: err:
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int RAND_write_file(const char *file)
sl@0: 	{
sl@0: 	unsigned char buf[BUFSIZE];
sl@0: 	int i,ret=0,rand_err=0;
sl@0: 	FILE *out = NULL;
sl@0: 	int n;
sl@0: 	struct stat sb;
sl@0: 	
sl@0: 	i=stat(file,&sb);
sl@0: 	if (i != -1) { 
sl@0: #if defined(S_IFBLK) && defined(S_IFCHR)
sl@0: 	  if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
sl@0: 	    /* this file is a device. we don't write back to it. 
sl@0: 	     * we "succeed" on the assumption this is some sort 
sl@0: 	     * of random device. Otherwise attempting to write to 
sl@0: 	     * and chmod the device causes problems.
sl@0: 	     */
sl@0: 	    return(1); 
sl@0: 	  }
sl@0: #endif
sl@0: 	}
sl@0: 
sl@0: #if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32)
sl@0: 	{
sl@0: 	/* For some reason Win32 can't write to files created this way */
sl@0: 	
sl@0: 	/* chmod(..., 0600) is too late to protect the file,
sl@0: 	 * permissions should be restrictive from the start */
sl@0: 	int fd = open(file, O_CREAT, 0600);
sl@0: 	if (fd != -1)
sl@0: 		out = fdopen(fd, "wb");
sl@0: 	}
sl@0: #endif
sl@0: 	if (out == NULL)
sl@0: 		out = fopen(file,"wb");
sl@0: 	if (out == NULL) goto err;
sl@0: 
sl@0: #ifndef NO_CHMOD
sl@0: 	chmod(file,0600);
sl@0: #endif
sl@0: 	n=RAND_DATA;
sl@0: 	for (;;)
sl@0: 		{
sl@0: 		i=(n > BUFSIZE)?BUFSIZE:n;
sl@0: 		n-=BUFSIZE;
sl@0: 		if (RAND_bytes(buf,i) <= 0)
sl@0: 			rand_err=1;
sl@0: 		i=fwrite(buf,1,i,out);
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			ret=0;
sl@0: 			break;
sl@0: 			}
sl@0: 		ret+=i;
sl@0: 		if (n <= 0) break;
sl@0:                 }
sl@0: #ifdef OPENSSL_SYS_VMS
sl@0: 	/* Try to delete older versions of the file, until there aren't
sl@0: 	   any */
sl@0: 	{
sl@0: 	char *tmpf;
sl@0: 
sl@0: 	tmpf = OPENSSL_malloc(strlen(file) + 4);  /* to add ";-1" and a nul */
sl@0: 	if (tmpf)
sl@0: 		{
sl@0: 		strcpy(tmpf, file);
sl@0: 		strcat(tmpf, ";-1");
sl@0: 		while(delete(tmpf) == 0)
sl@0: 			;
sl@0: 		rename(file,";1"); /* Make sure it's version 1, or we
sl@0: 				      will reach the limit (32767) at
sl@0: 				      some point... */
sl@0: 		}
sl@0: 	}
sl@0: #endif /* OPENSSL_SYS_VMS */
sl@0: 
sl@0: 	fclose(out);
sl@0: 	OPENSSL_cleanse(buf,BUFSIZE);
sl@0: err:
sl@0: 	return (rand_err ? -1 : ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const char *RAND_file_name(char *buf, size_t size)
sl@0: 	{
sl@0: 	char *s=NULL;
sl@0: 	int ok = 0;
sl@0: #ifdef __OpenBSD__
sl@0: 	struct stat sb;
sl@0: #endif
sl@0: 
sl@0: 	if (OPENSSL_issetugid() == 0)
sl@0: 		s=getenv("RANDFILE");
sl@0: 	if (s != NULL && *s && strlen(s) + 1 < size)
sl@0: 		{
sl@0: 		if (BUF_strlcpy(buf,s,size) >= size)
sl@0: 			return NULL;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if (OPENSSL_issetugid() == 0)
sl@0: 			s=getenv("HOME");
sl@0: #ifdef DEFAULT_HOME
sl@0: 		if (s == NULL)
sl@0: 			{
sl@0: 			s = DEFAULT_HOME;
sl@0: 			}
sl@0: #endif
sl@0: 		if (s && *s && strlen(s)+strlen(RFILE)+2 < size)
sl@0: 			{
sl@0: 			BUF_strlcpy(buf,s,size);
sl@0: #ifndef OPENSSL_SYS_VMS
sl@0: 			BUF_strlcat(buf,"/",size);
sl@0: #endif
sl@0: 			BUF_strlcat(buf,RFILE,size);
sl@0: 			ok = 1;
sl@0: 			}
sl@0: 		else
sl@0: 		  	buf[0] = '\0'; /* no file name */
sl@0: 		}
sl@0: 
sl@0: #ifdef __OpenBSD__
sl@0: 	/* given that all random loads just fail if the file can't be 
sl@0: 	 * seen on a stat, we stat the file we're returning, if it
sl@0: 	 * fails, use /dev/arandom instead. this allows the user to 
sl@0: 	 * use their own source for good random data, but defaults
sl@0: 	 * to something hopefully decent if that isn't available. 
sl@0: 	 */
sl@0: 
sl@0: 	if (!ok)
sl@0: 		if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
sl@0: 			return(NULL);
sl@0: 		}	
sl@0: 	if (stat(buf,&sb) == -1)
sl@0: 		if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
sl@0: 			return(NULL);
sl@0: 		}	
sl@0: 
sl@0: #endif
sl@0: 	return(buf);
sl@0: 	}