338 lines
11 KiB
C
338 lines
11 KiB
C
/* crypto/rand/randfile.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* We need to define this to get macros like S_IFBLK and S_IFCHR */
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#if !defined(OPENSSL_SYS_VXWORKS)
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# define _XOPEN_SOURCE 500
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "e_os.h"
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#include <openssl/crypto.h>
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#include <openssl/rand.h>
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#include <openssl/buffer.h>
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#ifdef OPENSSL_SYS_VMS
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# include <unixio.h>
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#endif
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#ifndef NO_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifndef OPENSSL_NO_POSIX_IO
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# include <sys/stat.h>
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# include <fcntl.h>
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#endif
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#ifdef _WIN32
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# define stat _stat
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# define chmod _chmod
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# define open _open
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# define fdopen _fdopen
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#endif
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#undef BUFSIZE
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#define BUFSIZE 1024
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#define RAND_DATA 1024
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#ifdef OPENSSL_SYS_VMS
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/*
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* This declaration is a nasty hack to get around vms' extension to fopen for
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* passing in sharing options being disabled by our /STANDARD=ANSI89
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*/
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static FILE *(*const vms_fopen)(const char *, const char *, ...) =
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(FILE *(*)(const char *, const char *, ...))fopen;
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# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0"
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#endif
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/* #define RFILE ".rnd" - defined in ../../e_os.h */
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/*
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* Note that these functions are intended for seed files only. Entropy
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* devices and EGD sockets are handled in rand_unix.c
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*/
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int RAND_load_file(const char *file, long bytes)
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{
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/*-
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* If bytes >= 0, read up to 'bytes' bytes.
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* if bytes == -1, read complete file.
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*/
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MS_STATIC unsigned char buf[BUFSIZE];
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#ifndef OPENSSL_NO_POSIX_IO
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struct stat sb;
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#endif
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int i, ret = 0, n;
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FILE *in;
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if (file == NULL)
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return (0);
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#ifndef OPENSSL_NO_POSIX_IO
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# ifdef PURIFY
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/*
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* struct stat can have padding and unused fields that may not be
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* initialized in the call to stat(). We need to clear the entire
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* structure before calling RAND_add() to avoid complaints from
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* applications such as Valgrind.
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*/
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memset(&sb, 0, sizeof(sb));
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# endif
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if (stat(file, &sb) < 0)
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return (0);
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RAND_add(&sb, sizeof(sb), 0.0);
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#endif
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if (bytes == 0)
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return (ret);
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#ifdef OPENSSL_SYS_VMS
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in = vms_fopen(file, "rb", VMS_OPEN_ATTRS);
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#else
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in = fopen(file, "rb");
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#endif
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if (in == NULL)
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goto err;
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#if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPENSSL_NO_POSIX_IO)
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if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
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/*
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* this file is a device. we don't want read an infinite number of
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* bytes from a random device, nor do we want to use buffered I/O
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* because we will waste system entropy.
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*/
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bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
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# ifndef OPENSSL_NO_SETVBUF_IONBF
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setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */
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# endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
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}
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#endif
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for (;;) {
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if (bytes > 0)
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n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
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else
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n = BUFSIZE;
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i = fread(buf, 1, n, in);
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if (i <= 0)
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break;
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#ifdef PURIFY
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RAND_add(buf, i, (double)i);
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#else
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/* even if n != i, use the full array */
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RAND_add(buf, n, (double)i);
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#endif
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ret += i;
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if (bytes > 0) {
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bytes -= n;
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if (bytes <= 0)
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break;
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}
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}
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fclose(in);
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OPENSSL_cleanse(buf, BUFSIZE);
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err:
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return (ret);
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}
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int RAND_write_file(const char *file)
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{
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unsigned char buf[BUFSIZE];
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int i, ret = 0, rand_err = 0;
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FILE *out = NULL;
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int n;
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#ifndef OPENSSL_NO_POSIX_IO
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struct stat sb;
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i = stat(file, &sb);
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if (i != -1) {
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# if defined(S_ISBLK) && defined(S_ISCHR)
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if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
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/*
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* this file is a device. we don't write back to it. we
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* "succeed" on the assumption this is some sort of random
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* device. Otherwise attempting to write to and chmod the device
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* causes problems.
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*/
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return (1);
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}
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# endif
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}
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#endif
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#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS)
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{
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# ifndef O_BINARY
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# define O_BINARY 0
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# endif
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/*
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* chmod(..., 0600) is too late to protect the file, permissions
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* should be restrictive from the start
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*/
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int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600);
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if (fd != -1)
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out = fdopen(fd, "wb");
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}
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#endif
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#ifdef OPENSSL_SYS_VMS
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/*
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* VMS NOTE: Prior versions of this routine created a _new_ version of
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* the rand file for each call into this routine, then deleted all
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* existing versions named ;-1, and finally renamed the current version
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* as ';1'. Under concurrent usage, this resulted in an RMS race
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* condition in rename() which could orphan files (see vms message help
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* for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares
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* the top-level version of the rand file. Note that there may still be
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* conditions where the top-level rand file is locked. If so, this code
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* will then create a new version of the rand file. Without the delete
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* and rename code, this can result in ascending file versions that stop
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* at version 32767, and this routine will then return an error. The
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* remedy for this is to recode the calling application to avoid
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* concurrent use of the rand file, or synchronize usage at the
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* application level. Also consider whether or not you NEED a persistent
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* rand file in a concurrent use situation.
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*/
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out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS);
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if (out == NULL)
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out = vms_fopen(file, "wb", VMS_OPEN_ATTRS);
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#else
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if (out == NULL)
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out = fopen(file, "wb");
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#endif
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if (out == NULL)
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goto err;
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#ifndef NO_CHMOD
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chmod(file, 0600);
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#endif
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n = RAND_DATA;
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for (;;) {
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i = (n > BUFSIZE) ? BUFSIZE : n;
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n -= BUFSIZE;
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if (RAND_bytes(buf, i) <= 0)
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rand_err = 1;
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i = fwrite(buf, 1, i, out);
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if (i <= 0) {
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ret = 0;
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break;
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}
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ret += i;
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if (n <= 0)
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break;
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}
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fclose(out);
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OPENSSL_cleanse(buf, BUFSIZE);
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err:
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return (rand_err ? -1 : ret);
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}
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const char *RAND_file_name(char *buf, size_t size)
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{
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char *s = NULL;
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#ifdef __OpenBSD__
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struct stat sb;
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#endif
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if (OPENSSL_issetugid() == 0)
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s = getenv("RANDFILE");
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if (s != NULL && *s && strlen(s) + 1 < size) {
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if (BUF_strlcpy(buf, s, size) >= size)
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return NULL;
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} else {
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if (OPENSSL_issetugid() == 0)
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s = getenv("HOME");
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#ifdef DEFAULT_HOME
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if (s == NULL) {
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s = DEFAULT_HOME;
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}
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#endif
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if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) {
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BUF_strlcpy(buf, s, size);
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#ifndef OPENSSL_SYS_VMS
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BUF_strlcat(buf, "/", size);
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#endif
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BUF_strlcat(buf, RFILE, size);
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} else
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buf[0] = '\0'; /* no file name */
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}
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#ifdef __OpenBSD__
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/*
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* given that all random loads just fail if the file can't be seen on a
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* stat, we stat the file we're returning, if it fails, use /dev/arandom
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* instead. this allows the user to use their own source for good random
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* data, but defaults to something hopefully decent if that isn't
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* available.
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*/
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if (!buf[0])
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if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) {
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return (NULL);
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}
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if (stat(buf, &sb) == -1)
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if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) {
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return (NULL);
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}
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#endif
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return (buf);
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}
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