1998-04-07 18:16:10 +00:00
|
|
|
/* misc.c - miscellaneous functions
|
2001-03-08 14:33:24 +00:00
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|
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* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
|
1998-04-07 18:16:10 +00:00
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|
*
|
1998-12-23 12:41:40 +00:00
|
|
|
* This file is part of GnuPG.
|
1998-04-07 18:16:10 +00:00
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|
*
|
1998-12-23 12:41:40 +00:00
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|
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* GnuPG is free software; you can redistribute it and/or modify
|
1998-04-07 18:16:10 +00:00
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|
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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|
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* (at your option) any later version.
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|
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*
|
1998-12-23 12:41:40 +00:00
|
|
|
* GnuPG is distributed in the hope that it will be useful,
|
1998-04-07 18:16:10 +00:00
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|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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|
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
|
2000-10-13 15:03:48 +00:00
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|
#include <unistd.h>
|
1998-07-14 17:10:28 +00:00
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|
|
#include <errno.h>
|
1998-12-17 17:36:05 +00:00
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|
|
#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
|
1998-05-15 18:49:19 +00:00
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|
#include <asm/sysinfo.h>
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|
#include <asm/unistd.h>
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|
|
|
#endif
|
1998-07-14 17:10:28 +00:00
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|
|
#ifdef HAVE_SETRLIMIT
|
2001-03-12 20:21:50 +00:00
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|
#include <time.h>
|
1998-07-14 17:10:28 +00:00
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|
#include <sys/time.h>
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|
#include <sys/resource.h>
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|
|
|
#endif
|
1998-04-07 18:16:10 +00:00
|
|
|
#include "util.h"
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|
|
|
#include "main.h"
|
1998-06-15 15:41:04 +00:00
|
|
|
#include "options.h"
|
1998-11-10 12:59:59 +00:00
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|
|
#include "i18n.h"
|
1998-04-07 18:16:10 +00:00
|
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|
1998-06-16 15:13:28 +00:00
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const char *g10m_revision_string(int);
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const char *g10c_revision_string(int);
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const char *g10u_revision_string(int);
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|
|
|
1999-05-20 12:11:41 +00:00
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|
|
#ifdef __GNUC__
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|
|
|
volatile
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|
|
|
#endif
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|
|
void
|
1998-06-15 15:41:04 +00:00
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|
|
pull_in_libs(void)
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|
|
|
{
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|
g10m_revision_string(0);
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|
|
g10c_revision_string(0);
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|
|
g10u_revision_string(0);
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|
|
|
}
|
1998-04-07 18:16:10 +00:00
|
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|
1998-05-15 18:49:19 +00:00
|
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|
|
1998-12-17 17:36:05 +00:00
|
|
|
#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
|
1998-05-15 18:49:19 +00:00
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|
#warning using trap_unaligned
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static int
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setsysinfo(unsigned long op, void *buffer, unsigned long size,
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int *start, void *arg, unsigned long flag)
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|
{
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return syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
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|
}
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void
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|
|
trap_unaligned(void)
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|
|
|
{
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unsigned int buf[2];
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|
buf[0] = SSIN_UACPROC;
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|
buf[1] = UAC_SIGBUS | UAC_NOPRINT;
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|
setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
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|
|
|
}
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#else
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void
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|
trap_unaligned(void)
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{ /* dummy */
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|
|
}
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|
#endif
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|
2000-09-14 12:20:30 +00:00
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|
int
|
1998-07-14 17:10:28 +00:00
|
|
|
disable_core_dumps()
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|
|
|
{
|
2000-09-14 12:20:30 +00:00
|
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|
#ifdef HAVE_DOSISH_SYSTEM
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|
return 0;
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|
|
#else
|
1998-07-14 17:10:28 +00:00
|
|
|
#ifdef HAVE_SETRLIMIT
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|
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struct rlimit limit;
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limit.rlim_cur = 0;
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|
limit.rlim_max = 0;
|
1998-12-29 13:47:31 +00:00
|
|
|
if( !setrlimit( RLIMIT_CORE, &limit ) )
|
2000-09-14 12:20:30 +00:00
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|
return 0;
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|
|
if( errno != EINVAL && errno != ENOSYS )
|
1998-11-10 12:59:59 +00:00
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|
log_fatal(_("can't disable core dumps: %s\n"), strerror(errno) );
|
1998-07-14 17:10:28 +00:00
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|
#endif
|
2000-09-14 12:20:30 +00:00
|
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|
return 1;
|
1999-08-30 18:48:57 +00:00
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|
|
#endif
|
1998-07-14 17:10:28 +00:00
|
|
|
}
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|
1998-04-07 18:16:10 +00:00
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|
u16
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|
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|
checksum_u16( unsigned n )
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|
|
|
{
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u16 a;
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a = (n >> 8) & 0xff;
|
1998-07-29 19:35:05 +00:00
|
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|
if( opt.emulate_bugs & EMUBUG_GPGCHKSUM ) {
|
1998-06-15 15:41:04 +00:00
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|
a |= n & 0xff;
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|
log_debug("csum_u16 emulated for n=%u\n", n);
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|
|
|
}
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|
else
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a += n & 0xff;
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|
return a;
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|
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|
}
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|
static u16
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|
checksum_u16_nobug( unsigned n )
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|
|
|
{
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|
u16 a;
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a = (n >> 8) & 0xff;
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|
a += n & 0xff;
|
1998-04-07 18:16:10 +00:00
|
|
|
return a;
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|
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|
}
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|
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|
u16
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|
|
|
checksum( byte *p, unsigned n )
|
|
|
|
{
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|
u16 a;
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for(a=0; n; n-- )
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a += *p++;
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|
return a;
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|
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|
}
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|
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|
u16
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|
|
|
checksum_mpi( MPI a )
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|
|
|
{
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|
|
|
u16 csum;
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byte *buffer;
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|
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unsigned nbytes;
|
1998-06-15 15:41:04 +00:00
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unsigned nbits;
|
1998-04-07 18:16:10 +00:00
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buffer = mpi_get_buffer( a, &nbytes, NULL );
|
1998-06-15 15:41:04 +00:00
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|
/* some versions of gpg encode wrong values for the length of an mpi
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|
* so that mpi_get_nbits() which counts the mpi yields another (shorter)
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* value than the one store with the mpi. mpi_get_nbit_info() returns
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|
* this stored value if it is still available.
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|
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|
*/
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|
1998-07-29 19:35:05 +00:00
|
|
|
if( opt.emulate_bugs & EMUBUG_GPGCHKSUM )
|
1998-06-15 15:41:04 +00:00
|
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|
nbits = 0;
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|
else
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|
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|
nbits = mpi_get_nbit_info(a);
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|
|
if( !nbits )
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|
nbits = mpi_get_nbits(a);
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|
|
|
csum = checksum_u16( nbits );
|
1998-04-07 18:16:10 +00:00
|
|
|
csum += checksum( buffer, nbytes );
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|
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|
m_free( buffer );
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|
return csum;
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|
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|
}
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|
|
|
|
1998-06-15 15:41:04 +00:00
|
|
|
/****************
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|
|
|
* This is the correct function
|
|
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|
*/
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|
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|
u16
|
|
|
|
checksum_mpi_counted_nbits( MPI a )
|
|
|
|
{
|
|
|
|
u16 csum;
|
|
|
|
byte *buffer;
|
|
|
|
unsigned nbytes;
|
|
|
|
unsigned nbits;
|
|
|
|
|
|
|
|
buffer = mpi_get_buffer( a, &nbytes, NULL );
|
|
|
|
nbits = mpi_get_nbits(a);
|
1998-06-16 15:13:28 +00:00
|
|
|
mpi_set_nbit_info(a,nbits);
|
1998-06-15 15:41:04 +00:00
|
|
|
csum = checksum_u16_nobug( nbits );
|
|
|
|
csum += checksum( buffer, nbytes );
|
|
|
|
m_free( buffer );
|
|
|
|
return csum;
|
|
|
|
}
|
1998-04-07 18:16:10 +00:00
|
|
|
|
1998-06-25 10:19:08 +00:00
|
|
|
|
|
|
|
u32
|
|
|
|
buffer_to_u32( const byte *buffer )
|
|
|
|
{
|
|
|
|
unsigned long a;
|
|
|
|
a = *buffer << 24;
|
|
|
|
a |= buffer[1] << 16;
|
|
|
|
a |= buffer[2] << 8;
|
|
|
|
a |= buffer[3];
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
1998-12-10 19:20:47 +00:00
|
|
|
|
|
|
|
static void
|
|
|
|
no_exp_algo(void)
|
|
|
|
{
|
|
|
|
static int did_note = 0;
|
|
|
|
|
|
|
|
if( !did_note ) {
|
|
|
|
did_note = 1;
|
|
|
|
log_info(_("Experimental algorithms should not be used!\n"));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
print_pubkey_algo_note( int algo )
|
|
|
|
{
|
|
|
|
if( algo >= 100 && algo <= 110 )
|
|
|
|
no_exp_algo();
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
print_cipher_algo_note( int algo )
|
|
|
|
{
|
|
|
|
if( algo >= 100 && algo <= 110 )
|
|
|
|
no_exp_algo();
|
|
|
|
else if( algo == CIPHER_ALGO_3DES
|
|
|
|
|| algo == CIPHER_ALGO_CAST5
|
|
|
|
|| algo == CIPHER_ALGO_BLOWFISH
|
1999-04-07 18:58:34 +00:00
|
|
|
|| algo == CIPHER_ALGO_TWOFISH
|
2000-10-18 15:06:45 +00:00
|
|
|
|| algo == CIPHER_ALGO_RIJNDAEL
|
|
|
|
|| algo == CIPHER_ALGO_RIJNDAEL192
|
|
|
|
|| algo == CIPHER_ALGO_RIJNDAEL256
|
1998-12-10 19:20:47 +00:00
|
|
|
)
|
|
|
|
;
|
|
|
|
else {
|
|
|
|
static int did_note = 0;
|
|
|
|
|
|
|
|
if( !did_note ) {
|
|
|
|
did_note = 1;
|
2000-10-18 16:41:09 +00:00
|
|
|
log_info(_("this cipher algorithm is deprecated; "
|
2001-04-23 11:44:46 +00:00
|
|
|
"please use a more standard one!\n"));
|
1998-12-10 19:20:47 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
print_digest_algo_note( int algo )
|
|
|
|
{
|
|
|
|
if( algo >= 100 && algo <= 110 )
|
|
|
|
no_exp_algo();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2000-10-13 15:03:48 +00:00
|
|
|
/* Return a string which is used as a kind of process ID */
|
|
|
|
const byte *
|
|
|
|
get_session_marker( size_t *rlen )
|
|
|
|
{
|
|
|
|
static byte marker[SIZEOF_UNSIGNED_LONG*2];
|
|
|
|
static int initialized;
|
|
|
|
|
|
|
|
if ( !initialized ) {
|
2001-03-27 09:23:14 +00:00
|
|
|
volatile ulong aa, bb; /* we really want the uninitialized value */
|
2000-10-13 15:03:48 +00:00
|
|
|
ulong a, b;
|
|
|
|
|
|
|
|
initialized = 1;
|
|
|
|
/* also this marker is guessable it is not easy to use this
|
|
|
|
* for a faked control packet because an attacker does not
|
|
|
|
* have enough control about the time the verification does
|
|
|
|
* take place. Of course, we can add just more random but
|
|
|
|
* than we need the random generator even for verification
|
|
|
|
* tasks - which does not make sense. */
|
|
|
|
a = aa ^ (ulong)getpid();
|
|
|
|
b = bb ^ (ulong)time(NULL);
|
|
|
|
memcpy( marker, &a, SIZEOF_UNSIGNED_LONG );
|
|
|
|
memcpy( marker+SIZEOF_UNSIGNED_LONG, &b, SIZEOF_UNSIGNED_LONG );
|
|
|
|
}
|
|
|
|
*rlen = sizeof(marker);
|
|
|
|
return marker;
|
|
|
|
}
|
1998-12-10 19:20:47 +00:00
|
|
|
|
2001-02-08 16:28:28 +00:00
|
|
|
/****************
|
|
|
|
* Wrapper around the libgcrypt function with addional checks on
|
|
|
|
* openPGP contraints for the algo ID.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
openpgp_cipher_test_algo( int algo )
|
|
|
|
{
|
|
|
|
if( algo < 0 || algo > 110 )
|
|
|
|
return G10ERR_CIPHER_ALGO;
|
|
|
|
return check_cipher_algo(algo);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
openpgp_pk_test_algo( int algo, unsigned int usage_flags )
|
|
|
|
{
|
|
|
|
if( algo < 0 || algo > 110 )
|
|
|
|
return G10ERR_PUBKEY_ALGO;
|
|
|
|
return check_pubkey_algo2( algo, usage_flags );
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
openpgp_pk_algo_usage ( int algo )
|
|
|
|
{
|
2001-09-09 16:09:19 +00:00
|
|
|
int use = 0;
|
2001-02-08 16:28:28 +00:00
|
|
|
|
|
|
|
/* they are hardwired in gpg 1.0 */
|
|
|
|
switch ( algo ) {
|
|
|
|
case PUBKEY_ALGO_RSA:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_SIG | PUBKEY_USAGE_ENC;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
case PUBKEY_ALGO_RSA_E:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_ENC;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
case PUBKEY_ALGO_RSA_S:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_SIG;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
case PUBKEY_ALGO_ELGAMAL_E:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_ENC;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
case PUBKEY_ALGO_DSA:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_SIG;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
case PUBKEY_ALGO_ELGAMAL:
|
2001-09-09 16:09:19 +00:00
|
|
|
use = PUBKEY_USAGE_SIG | PUBKEY_USAGE_ENC;
|
2001-02-08 16:28:28 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
2001-09-09 16:09:19 +00:00
|
|
|
return use;
|
2001-02-08 16:28:28 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
openpgp_md_test_algo( int algo )
|
|
|
|
{
|
|
|
|
if( algo < 0 || algo > 110 )
|
|
|
|
return G10ERR_DIGEST_ALGO;
|
|
|
|
return check_digest_algo(algo);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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2000-09-06 15:57:12 +00:00
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