mirror of
git://git.gnupg.org/gnupg.git
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39e659312e
algorithm name (CAST5, SHA1) rather than the short form (S3, H2). * main.h, keygen.c (keygen_get_std_prefs), keyedit.c (keyedit_menu): Return and use a fake uid packet rather than a string since we already have a nice parser/printer in keyedit.c:show_prefs. * main.h, misc.c (string_to_compress_algo): New.
568 lines
11 KiB
C
568 lines
11 KiB
C
/* misc.c - miscellaneous functions
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* Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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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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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
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#include <asm/sysinfo.h>
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#include <asm/unistd.h>
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#endif
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#ifdef HAVE_SETRLIMIT
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#include <time.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#include "util.h"
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#include "main.h"
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#include "photoid.h"
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#include "options.h"
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#include "i18n.h"
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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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#ifdef __GNUC__
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volatile
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#endif
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void
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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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}
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#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
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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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int
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disable_core_dumps()
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{
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#ifdef HAVE_DOSISH_SYSTEM
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return 0;
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#else
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#ifdef HAVE_SETRLIMIT
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struct rlimit limit;
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limit.rlim_cur = 0;
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limit.rlim_max = 0;
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if( !setrlimit( RLIMIT_CORE, &limit ) )
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return 0;
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if( errno != EINVAL && errno != ENOSYS )
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log_fatal(_("can't disable core dumps: %s\n"), strerror(errno) );
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#endif
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return 1;
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#endif
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}
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u16
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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;
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a += n & 0xff;
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return a;
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}
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u16
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checksum( byte *p, unsigned n )
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{
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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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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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unsigned nbytes;
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unsigned nbits;
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buffer = mpi_get_buffer( a, &nbytes, NULL );
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nbits = mpi_get_nbits(a);
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csum = checksum_u16( nbits );
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csum += checksum( buffer, nbytes );
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m_free( buffer );
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return csum;
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}
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u32
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buffer_to_u32( const byte *buffer )
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{
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unsigned long a;
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a = *buffer << 24;
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a |= buffer[1] << 16;
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a |= buffer[2] << 8;
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a |= buffer[3];
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return a;
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}
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static void
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no_exp_algo(void)
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{
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static int did_note = 0;
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if( !did_note ) {
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did_note = 1;
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log_info(_("Experimental algorithms should not be used!\n"));
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}
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}
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void
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print_pubkey_algo_note( int algo )
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{
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if( algo >= 100 && algo <= 110 )
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no_exp_algo();
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}
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void
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print_cipher_algo_note( int algo )
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{
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if( algo >= 100 && algo <= 110 )
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no_exp_algo();
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else if( algo == CIPHER_ALGO_3DES
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|| algo == CIPHER_ALGO_CAST5
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|| algo == CIPHER_ALGO_BLOWFISH
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|| algo == CIPHER_ALGO_TWOFISH
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|| algo == CIPHER_ALGO_RIJNDAEL
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|| algo == CIPHER_ALGO_RIJNDAEL192
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|| algo == CIPHER_ALGO_RIJNDAEL256
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)
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;
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else {
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static int did_note = 0;
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if( !did_note ) {
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did_note = 1;
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log_info(_("this cipher algorithm is deprecated; "
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"please use a more standard one!\n"));
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}
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}
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}
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void
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print_digest_algo_note( int algo )
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{
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if( algo >= 100 && algo <= 110 )
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no_exp_algo();
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}
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/* Return a string which is used as a kind of process ID */
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const byte *
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get_session_marker( size_t *rlen )
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{
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static byte marker[SIZEOF_UNSIGNED_LONG*2];
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static int initialized;
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if ( !initialized ) {
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volatile ulong aa, bb; /* we really want the uninitialized value */
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ulong a, b;
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initialized = 1;
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/* also this marker is guessable it is not easy to use this
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* for a faked control packet because an attacker does not
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* have enough control about the time the verification does
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* take place. Of course, we can add just more random but
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* than we need the random generator even for verification
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* tasks - which does not make sense. */
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a = aa ^ (ulong)getpid();
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b = bb ^ (ulong)time(NULL);
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memcpy( marker, &a, SIZEOF_UNSIGNED_LONG );
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memcpy( marker+SIZEOF_UNSIGNED_LONG, &b, SIZEOF_UNSIGNED_LONG );
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}
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*rlen = sizeof(marker);
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return marker;
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}
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/****************
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* Wrapper around the libgcrypt function with addional checks on
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* openPGP contraints for the algo ID.
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*/
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int
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openpgp_cipher_test_algo( int algo )
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{
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if( algo < 0 || algo > 110 )
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return G10ERR_CIPHER_ALGO;
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return check_cipher_algo(algo);
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}
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int
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openpgp_pk_test_algo( int algo, unsigned int usage_flags )
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{
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if( algo < 0 || algo > 110 )
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return G10ERR_PUBKEY_ALGO;
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return check_pubkey_algo2( algo, usage_flags );
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}
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int
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openpgp_pk_algo_usage ( int algo )
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{
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int use = 0;
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/* they are hardwired in gpg 1.0 */
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switch ( algo ) {
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case PUBKEY_ALGO_RSA:
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use = PUBKEY_USAGE_SIG | PUBKEY_USAGE_ENC;
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break;
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case PUBKEY_ALGO_RSA_E:
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use = PUBKEY_USAGE_ENC;
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break;
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case PUBKEY_ALGO_RSA_S:
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use = PUBKEY_USAGE_SIG;
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break;
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case PUBKEY_ALGO_ELGAMAL_E:
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use = PUBKEY_USAGE_ENC;
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break;
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case PUBKEY_ALGO_DSA:
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use = PUBKEY_USAGE_SIG;
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break;
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case PUBKEY_ALGO_ELGAMAL:
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use = PUBKEY_USAGE_SIG | PUBKEY_USAGE_ENC;
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break;
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default:
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break;
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}
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return use;
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}
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int
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openpgp_md_test_algo( int algo )
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{
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if( algo < 0 || algo > 110 )
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return G10ERR_DIGEST_ALGO;
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return check_digest_algo(algo);
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}
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/* Special warning for the IDEA cipher */
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void
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idea_cipher_warn(int show)
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{
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static int warned=0;
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if(!warned || show)
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{
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log_info(_("the IDEA cipher plugin is not present\n"));
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log_info(_("please see http://www.gnupg.org/why-not-idea.html "
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"for more information\n"));
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warned=1;
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}
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}
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/* Expand %-strings. Returns a string which must be m_freed. Returns
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NULL if the string cannot be expanded (too large). */
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char *
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pct_expando(const char *string,struct expando_args *args)
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{
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const char *ch=string;
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int idx=0,maxlen=0,done=0;
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u32 pk_keyid[2]={0,0},sk_keyid[2]={0,0};
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char *ret=NULL;
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if(args->pk)
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keyid_from_pk(args->pk,pk_keyid);
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if(args->sk)
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keyid_from_sk(args->sk,sk_keyid);
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if(!args->pk && args->sk)
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keyid_from_sk(args->sk,pk_keyid);
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while(*ch!='\0')
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{
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char *str=NULL;
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if(!done)
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{
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/* 8192 is way bigger than we'll need here */
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if(maxlen>=8192)
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goto fail;
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maxlen+=1024;
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ret=m_realloc(ret,maxlen);
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}
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done=0;
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if(*ch=='%')
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{
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switch(*(ch+1))
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{
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case 's': /* short key id */
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if(idx+8<maxlen)
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{
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sprintf(&ret[idx],"%08lX",(ulong)sk_keyid[1]);
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idx+=8;
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done=1;
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}
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break;
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case 'S': /* long key id */
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if(idx+16<maxlen)
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{
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sprintf(&ret[idx],"%08lX%08lX",
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(ulong)sk_keyid[0],(ulong)sk_keyid[1]);
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idx+=16;
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done=1;
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}
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break;
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case 'k': /* short key id */
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if(idx+8<maxlen)
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{
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sprintf(&ret[idx],"%08lX",(ulong)pk_keyid[1]);
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idx+=8;
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done=1;
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}
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break;
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case 'K': /* long key id */
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if(idx+16<maxlen)
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{
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sprintf(&ret[idx],"%08lX%08lX",
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(ulong)pk_keyid[0],(ulong)pk_keyid[1]);
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idx+=16;
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done=1;
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}
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break;
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case 'f': /* fingerprint */
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{
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byte array[MAX_FINGERPRINT_LEN];
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size_t len;
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int i;
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if(args->pk)
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fingerprint_from_pk(args->pk,array,&len);
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else
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memset(array,0, (len=MAX_FINGERPRINT_LEN));
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if(idx+(len*2)<maxlen)
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{
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for(i=0;i<len;i++)
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{
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sprintf(&ret[idx],"%02X",array[i]);
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idx+=2;
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}
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done=1;
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}
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}
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break;
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case 't': /* e.g. "jpg" */
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str=image_type_to_string(args->imagetype,0);
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/* fall through */
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case 'T': /* e.g. "image/jpeg" */
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if(str==NULL)
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str=image_type_to_string(args->imagetype,2);
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if(idx+strlen(str)<maxlen)
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{
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strcpy(&ret[idx],str);
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idx+=strlen(str);
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done=1;
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}
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break;
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case '%':
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if(idx+1<maxlen)
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{
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ret[idx++]='%';
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ret[idx]='\0';
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done=1;
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}
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break;
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/* Any unknown %-keys (like %i, %o, %I, and %O) are
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passed through for later expansion. Note this also
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handles the case where the last character in the
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string is a '%' - the terminating \0 will end up here
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and properly terminate the string. */
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default:
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if(idx+2<maxlen)
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{
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ret[idx++]='%';
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ret[idx++]=*(ch+1);
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ret[idx]='\0';
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done=1;
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}
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break;
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}
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if(done)
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ch++;
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}
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else
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{
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if(idx+1<maxlen)
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{
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ret[idx++]=*ch;
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ret[idx]='\0';
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done=1;
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}
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}
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if(done)
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ch++;
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}
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return ret;
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fail:
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m_free(ret);
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return NULL;
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}
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int
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hextobyte( const char *s )
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{
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int c;
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if( *s >= '0' && *s <= '9' )
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c = 16 * (*s - '0');
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else if( *s >= 'A' && *s <= 'F' )
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c = 16 * (10 + *s - 'A');
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else if( *s >= 'a' && *s <= 'f' )
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c = 16 * (10 + *s - 'a');
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else
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return -1;
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s++;
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if( *s >= '0' && *s <= '9' )
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c += *s - '0';
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else if( *s >= 'A' && *s <= 'F' )
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c += 10 + *s - 'A';
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else if( *s >= 'a' && *s <= 'f' )
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c += 10 + *s - 'a';
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else
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return -1;
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return c;
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}
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void
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deprecated_warning(const char *configname,unsigned int configlineno,
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const char *option,const char *repl1,const char *repl2)
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{
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if(configname)
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{
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if(strncmp("--",option,2)==0)
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option+=2;
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if(strncmp("--",repl1,2)==0)
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repl1+=2;
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log_info(_("%s:%d: deprecated option \"%s\"\n"),
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configname,configlineno,option);
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}
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else
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log_info(_("WARNING: \"%s\" is a deprecated option\n"),option);
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log_info(_("please use \"%s%s\" instead\n"),repl1,repl2);
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}
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const char *
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compress_algo_to_string(int algo)
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{
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const char *s="?";
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switch(algo)
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{
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case 0:
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s="Uncompressed";
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break;
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case 1:
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s="ZIP";
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break;
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case 2:
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s="ZLIB";
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break;
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}
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return s;
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}
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int
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string_to_compress_algo(const char *string)
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{
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if(ascii_strcasecmp(string,"uncompressed")==0)
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return 0;
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else if(ascii_strcasecmp(string,"zip")==0)
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return 1;
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else if(ascii_strcasecmp(string,"zlib")==0)
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return 2;
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else if(ascii_strcasecmp(string,"z0")==0)
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return 0;
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else if(ascii_strcasecmp(string,"z1")==0)
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return 1;
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else if(ascii_strcasecmp(string,"z2")==0)
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return 2;
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else
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return -1;
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}
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int
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check_compress_algo(int algo)
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{
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if(algo>=0 && algo<=2)
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return 0;
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return G10ERR_COMPR_ALGO;
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}
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