You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
270 lines
6.6 KiB
270 lines
6.6 KiB
/*-
|
|
* Copyright (c) 2014 Michihiro NAKAJIMA
|
|
* All rights reserved.
|
|
*
|
|
* 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 above 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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.
|
|
*/
|
|
|
|
#include "archive_platform.h"
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#endif
|
|
|
|
#if !defined(HAVE_ARC4RANDOM_BUF) && (!defined(_WIN32) || defined(__CYGWIN__))
|
|
|
|
#ifdef HAVE_FCNTL
|
|
#include <fcntl.h>
|
|
#endif
|
|
#ifdef HAVE_LIMITS_H
|
|
#include <limits.h>
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_TIME_H
|
|
#include <sys/time.h>
|
|
#endif
|
|
#ifdef HAVE_PTHREAD_H
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
static void arc4random_buf(void *, size_t);
|
|
|
|
#endif /* HAVE_ARC4RANDOM_BUF */
|
|
|
|
#include "archive.h"
|
|
#include "archive_random_private.h"
|
|
|
|
#if defined(HAVE_WINCRYPT_H) && !defined(__CYGWIN__)
|
|
#include <wincrypt.h>
|
|
#endif
|
|
|
|
#ifndef O_CLOEXEC
|
|
#define O_CLOEXEC 0
|
|
#endif
|
|
|
|
/*
|
|
* Random number generator function.
|
|
* This simply calls arc4random_buf function if the platform provides it.
|
|
*/
|
|
|
|
int
|
|
archive_random(void *buf, size_t nbytes)
|
|
{
|
|
#if defined(_WIN32) && !defined(__CYGWIN__)
|
|
HCRYPTPROV hProv;
|
|
BOOL success;
|
|
|
|
success = CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
|
|
CRYPT_VERIFYCONTEXT);
|
|
if (!success && GetLastError() == (DWORD)NTE_BAD_KEYSET) {
|
|
success = CryptAcquireContext(&hProv, NULL, NULL,
|
|
PROV_RSA_FULL, CRYPT_NEWKEYSET);
|
|
}
|
|
if (success) {
|
|
success = CryptGenRandom(hProv, (DWORD)nbytes, (BYTE*)buf);
|
|
CryptReleaseContext(hProv, 0);
|
|
if (success)
|
|
return ARCHIVE_OK;
|
|
}
|
|
/* TODO: Does this case really happen? */
|
|
return ARCHIVE_FAILED;
|
|
#else
|
|
arc4random_buf(buf, nbytes);
|
|
return ARCHIVE_OK;
|
|
#endif
|
|
}
|
|
|
|
#if !defined(HAVE_ARC4RANDOM_BUF) && (!defined(_WIN32) || defined(__CYGWIN__))
|
|
|
|
/* $OpenBSD: arc4random.c,v 1.24 2013/06/11 16:59:50 deraadt Exp $ */
|
|
/*
|
|
* Copyright (c) 1996, David Mazieres <dm@uun.org>
|
|
* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* Arc4 random number generator for OpenBSD.
|
|
*
|
|
* This code is derived from section 17.1 of Applied Cryptography,
|
|
* second edition, which describes a stream cipher allegedly
|
|
* compatible with RSA Labs "RC4" cipher (the actual description of
|
|
* which is a trade secret). The same algorithm is used as a stream
|
|
* cipher called "arcfour" in Tatu Ylonen's ssh package.
|
|
*
|
|
* RC4 is a registered trademark of RSA Laboratories.
|
|
*/
|
|
|
|
#ifdef __GNUC__
|
|
#define inline __inline
|
|
#else /* !__GNUC__ */
|
|
#define inline
|
|
#endif /* !__GNUC__ */
|
|
|
|
struct arc4_stream {
|
|
uint8_t i;
|
|
uint8_t j;
|
|
uint8_t s[256];
|
|
};
|
|
|
|
#define RANDOMDEV "/dev/urandom"
|
|
#define KEYSIZE 128
|
|
#ifdef HAVE_PTHREAD_H
|
|
static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
|
|
#define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx);
|
|
#define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx);
|
|
#else
|
|
#define _ARC4_LOCK()
|
|
#define _ARC4_UNLOCK()
|
|
#endif
|
|
|
|
static int rs_initialized;
|
|
static struct arc4_stream rs;
|
|
static pid_t arc4_stir_pid;
|
|
static int arc4_count;
|
|
|
|
static inline uint8_t arc4_getbyte(void);
|
|
static void arc4_stir(void);
|
|
|
|
static inline void
|
|
arc4_init(void)
|
|
{
|
|
int n;
|
|
|
|
for (n = 0; n < 256; n++)
|
|
rs.s[n] = n;
|
|
rs.i = 0;
|
|
rs.j = 0;
|
|
}
|
|
|
|
static inline void
|
|
arc4_addrandom(u_char *dat, int datlen)
|
|
{
|
|
int n;
|
|
uint8_t si;
|
|
|
|
rs.i--;
|
|
for (n = 0; n < 256; n++) {
|
|
rs.i = (rs.i + 1);
|
|
si = rs.s[rs.i];
|
|
rs.j = (rs.j + si + dat[n % datlen]);
|
|
rs.s[rs.i] = rs.s[rs.j];
|
|
rs.s[rs.j] = si;
|
|
}
|
|
rs.j = rs.i;
|
|
}
|
|
|
|
static void
|
|
arc4_stir(void)
|
|
{
|
|
int done, fd, i;
|
|
struct {
|
|
struct timeval tv;
|
|
pid_t pid;
|
|
u_char rnd[KEYSIZE];
|
|
} rdat;
|
|
|
|
if (!rs_initialized) {
|
|
arc4_init();
|
|
rs_initialized = 1;
|
|
}
|
|
done = 0;
|
|
fd = open(RANDOMDEV, O_RDONLY | O_CLOEXEC, 0);
|
|
if (fd >= 0) {
|
|
if (read(fd, &rdat, KEYSIZE) == KEYSIZE)
|
|
done = 1;
|
|
(void)close(fd);
|
|
}
|
|
if (!done) {
|
|
(void)gettimeofday(&rdat.tv, NULL);
|
|
rdat.pid = getpid();
|
|
/* We'll just take whatever was on the stack too... */
|
|
}
|
|
|
|
arc4_addrandom((u_char *)&rdat, KEYSIZE);
|
|
|
|
/*
|
|
* Discard early keystream, as per recommendations in:
|
|
* "(Not So) Random Shuffles of RC4" by Ilya Mironov.
|
|
*/
|
|
for (i = 0; i < 3072; i++)
|
|
(void)arc4_getbyte();
|
|
arc4_count = 1600000;
|
|
}
|
|
|
|
static void
|
|
arc4_stir_if_needed(void)
|
|
{
|
|
pid_t pid = getpid();
|
|
|
|
if (arc4_count <= 0 || !rs_initialized || arc4_stir_pid != pid) {
|
|
arc4_stir_pid = pid;
|
|
arc4_stir();
|
|
}
|
|
}
|
|
|
|
static inline uint8_t
|
|
arc4_getbyte(void)
|
|
{
|
|
uint8_t si, sj;
|
|
|
|
rs.i = (rs.i + 1);
|
|
si = rs.s[rs.i];
|
|
rs.j = (rs.j + si);
|
|
sj = rs.s[rs.j];
|
|
rs.s[rs.i] = sj;
|
|
rs.s[rs.j] = si;
|
|
return (rs.s[(si + sj) & 0xff]);
|
|
}
|
|
|
|
static void
|
|
arc4random_buf(void *_buf, size_t n)
|
|
{
|
|
u_char *buf = (u_char *)_buf;
|
|
_ARC4_LOCK();
|
|
arc4_stir_if_needed();
|
|
while (n--) {
|
|
if (--arc4_count <= 0)
|
|
arc4_stir();
|
|
buf[n] = arc4_getbyte();
|
|
}
|
|
_ARC4_UNLOCK();
|
|
}
|
|
|
|
#endif /* !HAVE_ARC4RANDOM_BUF */
|