mirror of
git://git.gnupg.org/gnupg.git
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1117 lines
26 KiB
C
1117 lines
26 KiB
C
/* build-packet.c - assemble packets and write them
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* Copyright (C) 1998, 1999, 2000, 2001 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 <assert.h>
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#include "packet.h"
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#include "errors.h"
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#include "iobuf.h"
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#include "mpi.h"
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#include "util.h"
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#include "cipher.h"
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#include "memory.h"
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#include "options.h"
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static int do_comment( IOBUF out, int ctb, PKT_comment *rem );
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static int do_user_id( IOBUF out, int ctb, PKT_user_id *uid );
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static int do_public_key( IOBUF out, int ctb, PKT_public_key *pk );
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static int do_secret_key( IOBUF out, int ctb, PKT_secret_key *pk );
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static int do_symkey_enc( IOBUF out, int ctb, PKT_symkey_enc *enc );
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static int do_pubkey_enc( IOBUF out, int ctb, PKT_pubkey_enc *enc );
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static u32 calc_plaintext( PKT_plaintext *pt );
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static int do_plaintext( IOBUF out, int ctb, PKT_plaintext *pt );
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static int do_encrypted( IOBUF out, int ctb, PKT_encrypted *ed );
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static int do_encrypted_mdc( IOBUF out, int ctb, PKT_encrypted *ed );
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static int do_mdc( IOBUF out, PKT_mdc *mdc );
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static int do_compressed( IOBUF out, int ctb, PKT_compressed *cd );
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static int do_signature( IOBUF out, int ctb, PKT_signature *sig );
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static int do_onepass_sig( IOBUF out, int ctb, PKT_onepass_sig *ops );
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static int calc_header_length( u32 len, int new_ctb );
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static int write_16(IOBUF inp, u16 a);
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static int write_32(IOBUF inp, u32 a);
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static int write_header( IOBUF out, int ctb, u32 len );
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static int write_sign_packet_header( IOBUF out, int ctb, u32 len );
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static int write_header2( IOBUF out, int ctb, u32 len, int hdrlen, int blkmode );
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static int write_new_header( IOBUF out, int ctb, u32 len, int hdrlen );
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static int write_version( IOBUF out, int ctb );
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/****************
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* Build a packet and write it to INP
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* Returns: 0 := okay
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* >0 := error
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* Note: Caller must free the packet
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*/
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int
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build_packet( IOBUF out, PACKET *pkt )
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{
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int new_ctb=0, rc=0, ctb;
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int pkttype;
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if( DBG_PACKET )
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log_debug("build_packet() type=%d\n", pkt->pkttype );
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assert( pkt->pkt.generic );
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switch( (pkttype = pkt->pkttype) ) {
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case PKT_OLD_COMMENT: pkttype = pkt->pkttype = PKT_COMMENT; break;
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case PKT_PLAINTEXT: new_ctb = pkt->pkt.plaintext->new_ctb; break;
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case PKT_ENCRYPTED:
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case PKT_ENCRYPTED_MDC: new_ctb = pkt->pkt.encrypted->new_ctb; break;
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case PKT_COMPRESSED:new_ctb = pkt->pkt.compressed->new_ctb; break;
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case PKT_USER_ID:
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if( pkt->pkt.user_id->photo )
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pkttype = PKT_PHOTO_ID;
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break;
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default: break;
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}
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if( new_ctb || pkttype > 15 ) /* new format */
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ctb = 0xc0 | (pkttype & 0x3f);
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else
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ctb = 0x80 | ((pkttype & 15)<<2);
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switch( pkttype ) {
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case PKT_PHOTO_ID:
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case PKT_USER_ID:
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rc = do_user_id( out, ctb, pkt->pkt.user_id );
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break;
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case PKT_COMMENT:
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rc = do_comment( out, ctb, pkt->pkt.comment );
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break;
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case PKT_PUBLIC_SUBKEY:
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case PKT_PUBLIC_KEY:
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rc = do_public_key( out, ctb, pkt->pkt.public_key );
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break;
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case PKT_SECRET_SUBKEY:
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case PKT_SECRET_KEY:
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rc = do_secret_key( out, ctb, pkt->pkt.secret_key );
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break;
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case PKT_SYMKEY_ENC:
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rc = do_symkey_enc( out, ctb, pkt->pkt.symkey_enc );
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break;
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case PKT_PUBKEY_ENC:
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rc = do_pubkey_enc( out, ctb, pkt->pkt.pubkey_enc );
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break;
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case PKT_PLAINTEXT:
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rc = do_plaintext( out, ctb, pkt->pkt.plaintext );
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break;
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case PKT_ENCRYPTED:
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rc = do_encrypted( out, ctb, pkt->pkt.encrypted );
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break;
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case PKT_ENCRYPTED_MDC:
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rc = do_encrypted_mdc( out, ctb, pkt->pkt.encrypted );
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break;
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case PKT_MDC:
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rc = do_mdc( out, pkt->pkt.mdc );
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break;
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case PKT_COMPRESSED:
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rc = do_compressed( out, ctb, pkt->pkt.compressed );
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break;
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case PKT_SIGNATURE:
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rc = do_signature( out, ctb, pkt->pkt.signature );
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break;
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case PKT_ONEPASS_SIG:
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rc = do_onepass_sig( out, ctb, pkt->pkt.onepass_sig );
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break;
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case PKT_RING_TRUST:
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break; /* ignore it (keyring.c does write it directly)*/
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default:
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log_bug("invalid packet type in build_packet()\n");
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break;
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}
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return rc;
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}
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/****************
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* calculate the length of a packet described by PKT
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*/
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u32
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calc_packet_length( PACKET *pkt )
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{
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u32 n=0;
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int new_ctb = 0;
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assert( pkt->pkt.generic );
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switch( pkt->pkttype ) {
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case PKT_PLAINTEXT:
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n = calc_plaintext( pkt->pkt.plaintext );
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new_ctb = pkt->pkt.plaintext->new_ctb;
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break;
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case PKT_PHOTO_ID:
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case PKT_USER_ID:
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case PKT_COMMENT:
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case PKT_PUBLIC_KEY:
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case PKT_SECRET_KEY:
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case PKT_SYMKEY_ENC:
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case PKT_PUBKEY_ENC:
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case PKT_ENCRYPTED:
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case PKT_SIGNATURE:
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case PKT_ONEPASS_SIG:
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case PKT_RING_TRUST:
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case PKT_COMPRESSED:
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default:
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log_bug("invalid packet type in calc_packet_length()");
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break;
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}
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n += calc_header_length(n, new_ctb);
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return n;
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}
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static void
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write_fake_data( IOBUF out, MPI a )
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{
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if( a ) {
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int i;
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void *p;
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p = mpi_get_opaque( a, &i );
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iobuf_write( out, p, i );
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}
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}
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static int
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do_comment( IOBUF out, int ctb, PKT_comment *rem )
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{
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if( !opt.no_comment ) {
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write_header(out, ctb, rem->len);
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if( iobuf_write( out, rem->data, rem->len ) )
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return G10ERR_WRITE_FILE;
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}
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return 0;
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}
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static int
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do_user_id( IOBUF out, int ctb, PKT_user_id *uid )
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{
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if( uid->photo ) {
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write_header(out, ctb, uid->photolen);
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if( iobuf_write( out, uid->photo, uid->photolen ) )
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return G10ERR_WRITE_FILE;
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}
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else {
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write_header(out, ctb, uid->len);
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if( iobuf_write( out, uid->name, uid->len ) )
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return G10ERR_WRITE_FILE;
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}
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return 0;
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}
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static int
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do_public_key( IOBUF out, int ctb, PKT_public_key *pk )
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{
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int rc = 0;
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int n, i;
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IOBUF a = iobuf_temp();
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if( !pk->version )
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iobuf_put( a, 3 );
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else
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iobuf_put( a, pk->version );
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write_32(a, pk->timestamp );
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if( pk->version < 4 ) {
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u16 ndays;
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if( pk->expiredate )
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ndays = (u16)((pk->expiredate - pk->timestamp) / 86400L);
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else
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ndays = 0;
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write_16(a, ndays );
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}
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iobuf_put(a, pk->pubkey_algo );
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n = pubkey_get_npkey( pk->pubkey_algo );
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if( !n )
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write_fake_data( a, pk->pkey[0] );
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for(i=0; i < n; i++ )
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mpi_write(a, pk->pkey[i] );
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write_header2(out, ctb, iobuf_get_temp_length(a), pk->hdrbytes, 1 );
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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iobuf_close(a);
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return rc;
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}
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/****************
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* Make a hash value from the public key certificate
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*/
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void
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hash_public_key( MD_HANDLE md, PKT_public_key *pk )
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{
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PACKET pkt;
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int rc = 0;
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int ctb;
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ulong pktlen;
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int c;
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IOBUF a = iobuf_temp();
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#if 0
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FILE *fp = fopen("dump.pk", "a");
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int i=0;
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fprintf(fp, "\nHashing PK (v%d):\n", pk->version);
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#endif
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/* build the packet */
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init_packet(&pkt);
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pkt.pkttype = PKT_PUBLIC_KEY;
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pkt.pkt.public_key = pk;
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if( (rc = build_packet( a, &pkt )) )
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log_fatal("build public_key for hashing failed: %s\n", g10_errstr(rc));
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if( !(pk->version == 3 && pk->pubkey_algo == 16) ) {
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/* skip the constructed header but don't do this for our very old
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* v3 ElG keys */
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ctb = iobuf_get_noeof(a);
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pktlen = 0;
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if( (ctb & 0x40) ) {
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c = iobuf_get_noeof(a);
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if( c < 192 )
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pktlen = c;
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else if( c < 224 ) {
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pktlen = (c - 192) * 256;
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c = iobuf_get_noeof(a);
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pktlen += c + 192;
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}
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else if( c == 255 ) {
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pktlen = iobuf_get_noeof(a) << 24;
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pktlen |= iobuf_get_noeof(a) << 16;
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pktlen |= iobuf_get_noeof(a) << 8;
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pktlen |= iobuf_get_noeof(a);
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}
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}
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else {
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int lenbytes = ((ctb&3)==3)? 0 : (1<<(ctb & 3));
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for( ; lenbytes; lenbytes-- ) {
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pktlen <<= 8;
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pktlen |= iobuf_get_noeof(a);
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}
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}
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/* hash a header */
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md_putc( md, 0x99 );
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pktlen &= 0xffff; /* can't handle longer packets */
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md_putc( md, pktlen >> 8 );
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md_putc( md, pktlen & 0xff );
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}
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/* hash the packet body */
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while( (c=iobuf_get(a)) != -1 ) {
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#if 0
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fprintf( fp," %02x", c );
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if( (++i == 24) ) {
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putc('\n', fp);
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i=0;
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}
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#endif
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md_putc( md, c );
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}
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#if 0
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putc('\n', fp);
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fclose(fp);
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#endif
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iobuf_cancel(a);
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}
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static int
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do_secret_key( IOBUF out, int ctb, PKT_secret_key *sk )
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{
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int rc = 0;
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int i, nskey, npkey;
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IOBUF a = iobuf_temp();
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if( !sk->version )
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iobuf_put( a, 3 );
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else
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iobuf_put( a, sk->version );
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write_32(a, sk->timestamp );
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if( sk->version < 4 ) {
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u16 ndays;
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if( sk->expiredate )
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ndays = (u16)((sk->expiredate - sk->timestamp) / 86400L);
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else
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ndays = 0;
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write_16(a, ndays);
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}
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iobuf_put(a, sk->pubkey_algo );
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nskey = pubkey_get_nskey( sk->pubkey_algo );
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npkey = pubkey_get_npkey( sk->pubkey_algo );
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if( !npkey ) {
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write_fake_data( a, sk->skey[0] );
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goto leave;
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}
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assert( npkey < nskey );
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for(i=0; i < npkey; i++ )
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mpi_write(a, sk->skey[i] );
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if( sk->is_protected ) {
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if( is_RSA(sk->pubkey_algo) && sk->version < 4
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&& !sk->protect.s2k.mode ) {
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iobuf_put(a, sk->protect.algo );
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iobuf_write(a, sk->protect.iv, sk->protect.ivlen );
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}
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else {
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iobuf_put(a, 0xff );
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iobuf_put(a, sk->protect.algo );
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if( sk->protect.s2k.mode >= 1000 ) {
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iobuf_put(a, 101 );
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iobuf_put(a, sk->protect.s2k.hash_algo );
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iobuf_write(a, "GNU", 3 );
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iobuf_put(a, sk->protect.s2k.mode - 1000 );
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}
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else {
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iobuf_put(a, sk->protect.s2k.mode );
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iobuf_put(a, sk->protect.s2k.hash_algo );
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}
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if( sk->protect.s2k.mode == 1
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|| sk->protect.s2k.mode == 3 )
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iobuf_write(a, sk->protect.s2k.salt, 8 );
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if( sk->protect.s2k.mode == 3 )
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iobuf_put(a, sk->protect.s2k.count );
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if( sk->protect.s2k.mode != 1001 )
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iobuf_write(a, sk->protect.iv, sk->protect.ivlen );
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}
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}
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else
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iobuf_put(a, 0 );
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if( sk->protect.s2k.mode == 1001 )
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;
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else if( sk->is_protected && sk->version >= 4 ) {
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byte *p;
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assert( mpi_is_opaque( sk->skey[npkey] ) );
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p = mpi_get_opaque( sk->skey[npkey], &i );
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iobuf_write(a, p, i );
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}
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else {
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for( ; i < nskey; i++ )
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mpi_write(a, sk->skey[i] );
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write_16(a, sk->csum );
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}
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|
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leave:
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write_header2(out, ctb, iobuf_get_temp_length(a), sk->hdrbytes, 1 );
|
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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|
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iobuf_close(a);
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return rc;
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}
|
|
|
|
static int
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do_symkey_enc( IOBUF out, int ctb, PKT_symkey_enc *enc )
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{
|
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int rc = 0;
|
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IOBUF a = iobuf_temp();
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|
|
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assert( enc->version == 4 );
|
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switch( enc->s2k.mode ) {
|
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case 0: case 1: case 3: break;
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default: log_bug("do_symkey_enc: s2k=%d\n", enc->s2k.mode );
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}
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iobuf_put( a, enc->version );
|
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iobuf_put( a, enc->cipher_algo );
|
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iobuf_put( a, enc->s2k.mode );
|
|
iobuf_put( a, enc->s2k.hash_algo );
|
|
if( enc->s2k.mode == 1 || enc->s2k.mode == 3 ) {
|
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iobuf_write(a, enc->s2k.salt, 8 );
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|
if( enc->s2k.mode == 3 )
|
|
iobuf_put(a, enc->s2k.count);
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}
|
|
if( enc->seskeylen )
|
|
iobuf_write(a, enc->seskey, enc->seskeylen );
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|
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write_header(out, ctb, iobuf_get_temp_length(a) );
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if( iobuf_write_temp( out, a ) )
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rc = G10ERR_WRITE_FILE;
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|
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iobuf_close(a);
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return rc;
|
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}
|
|
|
|
|
|
|
|
|
|
static int
|
|
do_pubkey_enc( IOBUF out, int ctb, PKT_pubkey_enc *enc )
|
|
{
|
|
int rc = 0;
|
|
int n, i;
|
|
IOBUF a = iobuf_temp();
|
|
|
|
write_version( a, ctb );
|
|
if( enc->throw_keyid ) {
|
|
write_32(a, 0 ); /* don't tell Eve who can decrypt the message */
|
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write_32(a, 0 );
|
|
}
|
|
else {
|
|
write_32(a, enc->keyid[0] );
|
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write_32(a, enc->keyid[1] );
|
|
}
|
|
iobuf_put(a,enc->pubkey_algo );
|
|
n = pubkey_get_nenc( enc->pubkey_algo );
|
|
if( !n )
|
|
write_fake_data( a, enc->data[0] );
|
|
for(i=0; i < n; i++ )
|
|
mpi_write(a, enc->data[i] );
|
|
|
|
write_header(out, ctb, iobuf_get_temp_length(a) );
|
|
if( iobuf_write_temp( out, a ) )
|
|
rc = G10ERR_WRITE_FILE;
|
|
|
|
iobuf_close(a);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
|
|
static u32
|
|
calc_plaintext( PKT_plaintext *pt )
|
|
{
|
|
return pt->len? (1 + 1 + pt->namelen + 4 + pt->len) : 0;
|
|
}
|
|
|
|
static int
|
|
do_plaintext( IOBUF out, int ctb, PKT_plaintext *pt )
|
|
{
|
|
int i, rc = 0;
|
|
u32 n;
|
|
byte buf[1000]; /* this buffer has the plaintext! */
|
|
int nbytes;
|
|
|
|
write_header(out, ctb, calc_plaintext( pt ) );
|
|
iobuf_put(out, pt->mode );
|
|
iobuf_put(out, pt->namelen );
|
|
for(i=0; i < pt->namelen; i++ )
|
|
iobuf_put(out, pt->name[i] );
|
|
if( write_32(out, pt->timestamp ) )
|
|
rc = G10ERR_WRITE_FILE;
|
|
|
|
n = 0;
|
|
while( (nbytes=iobuf_read(pt->buf, buf, 1000)) != -1 ) {
|
|
if( iobuf_write(out, buf, nbytes) == -1 ) {
|
|
rc = G10ERR_WRITE_FILE;
|
|
break;
|
|
}
|
|
n += nbytes;
|
|
}
|
|
memset(buf,0,1000); /* at least burn the buffer */
|
|
if( !pt->len )
|
|
iobuf_set_block_mode(out, 0 ); /* write end marker */
|
|
else if( n != pt->len )
|
|
log_error("do_plaintext(): wrote %lu bytes but expected %lu bytes\n",
|
|
(ulong)n, (ulong)pt->len );
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
do_encrypted( IOBUF out, int ctb, PKT_encrypted *ed )
|
|
{
|
|
int rc = 0;
|
|
u32 n;
|
|
|
|
n = ed->len ? (ed->len + ed->extralen) : 0;
|
|
write_header(out, ctb, n );
|
|
|
|
/* This is all. The caller has to write the real data */
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
do_encrypted_mdc( IOBUF out, int ctb, PKT_encrypted *ed )
|
|
{
|
|
int rc = 0;
|
|
u32 n;
|
|
|
|
assert( ed->mdc_method );
|
|
|
|
n = ed->len ? (ed->len + ed->extralen) : 0;
|
|
write_header(out, ctb, n );
|
|
iobuf_put(out, 1 ); /* version */
|
|
|
|
/* This is all. The caller has to write the real data */
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static int
|
|
do_mdc( IOBUF out, PKT_mdc *mdc )
|
|
{
|
|
/* This packet requires a fixed header encoding */
|
|
iobuf_put( out, 0xd3 ); /* packet ID and 1 byte length */
|
|
iobuf_put( out, 0x14 ); /* length = 20 */
|
|
if( iobuf_write( out, mdc->hash, sizeof(mdc->hash) ) )
|
|
return G10ERR_WRITE_FILE;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_compressed( IOBUF out, int ctb, PKT_compressed *cd )
|
|
{
|
|
int rc = 0;
|
|
|
|
/* we must use the old convention and don't use blockmode */
|
|
write_header2(out, ctb, 0, 0, 0 );
|
|
iobuf_put(out, cd->algorithm );
|
|
|
|
/* This is all. The caller has to write the real data */
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/****************
|
|
* Find a subpacket of type REQTYPE in AREA and a return a pointer
|
|
* to the first byte of that subpacket data.
|
|
* And return the length of the packet in RET_N and the number of
|
|
* header bytes in RET_HLEN (length header and type byte).
|
|
*/
|
|
static byte *
|
|
find_subpkt (subpktarea_t *area, sigsubpkttype_t reqtype,
|
|
size_t *ret_hlen, size_t *ret_n )
|
|
{
|
|
byte *buffer;
|
|
int buflen;
|
|
sigsubpkttype_t type;
|
|
byte *bufstart;
|
|
size_t n;
|
|
|
|
if( !area )
|
|
return NULL;
|
|
buflen = area->len;
|
|
buffer = area->data;
|
|
for(;;) {
|
|
if( !buflen )
|
|
return NULL; /* end of packets; not found */
|
|
bufstart = buffer;
|
|
n = *buffer++; buflen--;
|
|
if( n == 255 ) {
|
|
if( buflen < 4 )
|
|
break;
|
|
n = (buffer[0] << 24) | (buffer[1] << 16)
|
|
| (buffer[2] << 8) | buffer[3];
|
|
buffer += 4;
|
|
buflen -= 4;
|
|
}
|
|
else if( n >= 192 ) {
|
|
if( buflen < 2 )
|
|
break;
|
|
n = (( n - 192 ) << 8) + *buffer + 192;
|
|
buffer++;
|
|
buflen--;
|
|
}
|
|
if( buflen < n )
|
|
break;
|
|
type = *buffer & 0x7f;
|
|
if( type == reqtype ) {
|
|
buffer++;
|
|
n--;
|
|
if( n > buflen )
|
|
break;
|
|
if( ret_hlen )
|
|
*ret_hlen = buffer - bufstart;
|
|
if( ret_n )
|
|
*ret_n = n;
|
|
return buffer;
|
|
}
|
|
buffer += n; buflen -=n;
|
|
}
|
|
|
|
log_error("find_subpkt: buffer shorter than subpacket\n");
|
|
return NULL;
|
|
}
|
|
|
|
/****************
|
|
* Delete all subpackets of type REQTYPE and return a bool whether a packet
|
|
* was deleted.
|
|
*/
|
|
int
|
|
delete_sig_subpkt (subpktarea_t *area, sigsubpkttype_t reqtype )
|
|
{
|
|
int buflen;
|
|
sigsubpkttype_t type;
|
|
byte *buffer, *bufstart;
|
|
size_t n;
|
|
size_t unused = 0;
|
|
int okay = 0;
|
|
|
|
if( !area )
|
|
return 0;
|
|
buflen = area->len;
|
|
buffer = area->data;
|
|
for(;;) {
|
|
if( !buflen ) {
|
|
okay = 1;
|
|
break;
|
|
}
|
|
bufstart = buffer;
|
|
n = *buffer++; buflen--;
|
|
if( n == 255 ) {
|
|
if( buflen < 4 )
|
|
break;
|
|
n = (buffer[0] << 24) | (buffer[1] << 16)
|
|
| (buffer[2] << 8) | buffer[3];
|
|
buffer += 4;
|
|
buflen -= 4;
|
|
}
|
|
else if( n >= 192 ) {
|
|
if( buflen < 2 )
|
|
break;
|
|
n = (( n - 192 ) << 8) + *buffer + 192;
|
|
buffer++;
|
|
buflen--;
|
|
}
|
|
if( buflen < n )
|
|
break;
|
|
|
|
type = *buffer & 0x7f;
|
|
if( type == reqtype ) {
|
|
buffer++;
|
|
buflen--;
|
|
n--;
|
|
if( n > buflen )
|
|
break;
|
|
buffer += n; /* point to next subpkt */
|
|
buflen -= n;
|
|
memmove (bufstart, buffer, buflen); /* shift */
|
|
unused += buffer - bufstart;
|
|
buffer = bufstart;
|
|
}
|
|
else {
|
|
buffer += n; buflen -=n;
|
|
}
|
|
}
|
|
|
|
if (!okay)
|
|
log_error ("delete_subpkt: buffer shorter than subpacket\n");
|
|
assert (unused <= area->len);
|
|
area->len -= unused;
|
|
return !!unused;
|
|
}
|
|
|
|
|
|
/****************
|
|
* Create or update a signature subpacket for SIG of TYPE. This
|
|
* functions knows where to put the data (hashed or unhashed). The
|
|
* function may move data from the unhashed part to the hashed one.
|
|
* Note: All pointers into sig->[un]hashed (e.g. returned by
|
|
* parse_sig_subpkt) are not valid after a call to this function. The
|
|
* data to put into the subpaket should be in a buffer with a length
|
|
* of buflen.
|
|
*/
|
|
void
|
|
build_sig_subpkt (PKT_signature *sig, sigsubpkttype_t type,
|
|
const byte *buffer, size_t buflen )
|
|
{
|
|
byte *p;
|
|
int critical, hashed;
|
|
subpktarea_t *oldarea, *newarea;
|
|
size_t nlen, n, n0;
|
|
|
|
critical = (type & SIGSUBPKT_FLAG_CRITICAL);
|
|
type &= ~SIGSUBPKT_FLAG_CRITICAL;
|
|
|
|
if( type == SIGSUBPKT_NOTATION )
|
|
; /* we allow multiple packets */
|
|
else if (find_subpkt (sig->hashed, type, NULL, NULL) ) {
|
|
switch (type) {
|
|
case SIGSUBPKT_SIG_CREATED:
|
|
case SIGSUBPKT_PREF_SYM:
|
|
case SIGSUBPKT_PREF_HASH:
|
|
case SIGSUBPKT_PREF_COMPR:
|
|
case SIGSUBPKT_FEATURES:
|
|
delete_sig_subpkt (sig->hashed, type);
|
|
break;
|
|
default:
|
|
log_bug("build_sig_packet: update of hashed type %d nyi\n", type);
|
|
}
|
|
}
|
|
else if (find_subpkt (sig->unhashed, type, NULL, NULL)) {
|
|
switch (type) {
|
|
case SIGSUBPKT_PRIV_VERIFY_CACHE:
|
|
case SIGSUBPKT_ISSUER:
|
|
delete_sig_subpkt (sig->unhashed, type);
|
|
break;
|
|
default:
|
|
log_bug("build_sig_packet: update of unhashed type %d nyi\n",type);
|
|
}
|
|
}
|
|
|
|
if( (buflen+1) >= 8384 )
|
|
nlen = 5; /* write 5 byte length header */
|
|
else if( (buflen+1) >= 192 )
|
|
nlen = 2; /* write 2 byte length header */
|
|
else
|
|
nlen = 1; /* just a 1 byte length header */
|
|
|
|
switch( type ) {
|
|
case SIGSUBPKT_SIG_CREATED:
|
|
case SIGSUBPKT_PREF_SYM:
|
|
case SIGSUBPKT_PREF_HASH:
|
|
case SIGSUBPKT_PREF_COMPR:
|
|
case SIGSUBPKT_KS_FLAGS:
|
|
case SIGSUBPKT_KEY_EXPIRE:
|
|
case SIGSUBPKT_NOTATION:
|
|
case SIGSUBPKT_POLICY:
|
|
case SIGSUBPKT_REVOC_REASON:
|
|
case SIGSUBPKT_PRIMARY_UID:
|
|
case SIGSUBPKT_KEY_FLAGS:
|
|
case SIGSUBPKT_FEATURES:
|
|
hashed = 1; break;
|
|
default: hashed = 0; break;
|
|
}
|
|
|
|
if( critical )
|
|
type |= SIGSUBPKT_FLAG_CRITICAL;
|
|
|
|
oldarea = hashed? sig->hashed : sig->unhashed;
|
|
|
|
/* Calculate new size of the area and allocate */
|
|
n0 = oldarea? oldarea->len : 0;
|
|
n = n0 + nlen + 1 + buflen; /* length, type, buffer */
|
|
if (oldarea && n <= oldarea->size) { /* fits into the unused space */
|
|
newarea = oldarea;
|
|
/*log_debug ("updating area for type %d\n", type );*/
|
|
}
|
|
else if (oldarea) {
|
|
newarea = m_realloc (oldarea, sizeof (*newarea) + n - 1);
|
|
newarea->size = n;
|
|
/*log_debug ("reallocating area for type %d\n", type );*/
|
|
}
|
|
else {
|
|
newarea = m_alloc (sizeof (*newarea) + n - 1);
|
|
newarea->size = n;
|
|
/*log_debug ("allocating area for type %d\n", type );*/
|
|
}
|
|
newarea->len = n;
|
|
|
|
p = newarea->data + n0;
|
|
if (nlen == 5) {
|
|
*p++ = 255;
|
|
*p++ = (buflen+1) >> 24;
|
|
*p++ = (buflen+1) >> 16;
|
|
*p++ = (buflen+1) >> 8;
|
|
*p++ = (buflen+1);
|
|
*p++ = type;
|
|
memcpy (p, buffer, buflen);
|
|
}
|
|
else if (nlen == 2) {
|
|
*p++ = (buflen+1-192) / 256 + 192;
|
|
*p++ = (buflen+1-192) % 256;
|
|
*p++ = type;
|
|
memcpy (p, buffer, buflen);
|
|
}
|
|
else {
|
|
*p++ = buflen+1;
|
|
*p++ = type;
|
|
memcpy (p, buffer, buflen);
|
|
}
|
|
|
|
if (hashed)
|
|
sig->hashed = newarea;
|
|
else
|
|
sig->unhashed = newarea;
|
|
}
|
|
|
|
/****************
|
|
* Put all the required stuff from SIG into subpackets of sig.
|
|
* Hmmm, should we delete those subpackets which are in a wrong area?
|
|
*/
|
|
void
|
|
build_sig_subpkt_from_sig( PKT_signature *sig )
|
|
{
|
|
u32 u;
|
|
byte buf[8];
|
|
|
|
u = sig->keyid[0];
|
|
buf[0] = (u >> 24) & 0xff;
|
|
buf[1] = (u >> 16) & 0xff;
|
|
buf[2] = (u >> 8) & 0xff;
|
|
buf[3] = u & 0xff;
|
|
u = sig->keyid[1];
|
|
buf[4] = (u >> 24) & 0xff;
|
|
buf[5] = (u >> 16) & 0xff;
|
|
buf[6] = (u >> 8) & 0xff;
|
|
buf[7] = u & 0xff;
|
|
build_sig_subpkt( sig, SIGSUBPKT_ISSUER, buf, 8 );
|
|
|
|
u = sig->timestamp;
|
|
buf[0] = (u >> 24) & 0xff;
|
|
buf[1] = (u >> 16) & 0xff;
|
|
buf[2] = (u >> 8) & 0xff;
|
|
buf[3] = u & 0xff;
|
|
build_sig_subpkt( sig, SIGSUBPKT_SIG_CREATED, buf, 4 );
|
|
}
|
|
|
|
|
|
static int
|
|
do_signature( IOBUF out, int ctb, PKT_signature *sig )
|
|
{
|
|
int rc = 0;
|
|
int n, i;
|
|
IOBUF a = iobuf_temp();
|
|
|
|
if( !sig->version )
|
|
iobuf_put( a, 3 );
|
|
else
|
|
iobuf_put( a, sig->version );
|
|
if( sig->version < 4 )
|
|
iobuf_put(a, 5 ); /* constant */
|
|
iobuf_put(a, sig->sig_class );
|
|
if( sig->version < 4 ) {
|
|
write_32(a, sig->timestamp );
|
|
write_32(a, sig->keyid[0] );
|
|
write_32(a, sig->keyid[1] );
|
|
}
|
|
iobuf_put(a, sig->pubkey_algo );
|
|
iobuf_put(a, sig->digest_algo );
|
|
if( sig->version >= 4 ) {
|
|
size_t nn;
|
|
/* timestamp and keyid must have been packed into the
|
|
* subpackets prior to the call of this function, because
|
|
* these subpackets are hashed */
|
|
nn = sig->hashed? sig->hashed->len : 0;
|
|
write_16(a, nn);
|
|
if( nn )
|
|
iobuf_write( a, sig->hashed->data, nn );
|
|
nn = sig->unhashed? sig->unhashed->len : 0;
|
|
write_16(a, nn);
|
|
if( nn )
|
|
iobuf_write( a, sig->unhashed->data, nn );
|
|
}
|
|
iobuf_put(a, sig->digest_start[0] );
|
|
iobuf_put(a, sig->digest_start[1] );
|
|
n = pubkey_get_nsig( sig->pubkey_algo );
|
|
if( !n )
|
|
write_fake_data( a, sig->data[0] );
|
|
for(i=0; i < n; i++ )
|
|
mpi_write(a, sig->data[i] );
|
|
|
|
if( is_RSA(sig->pubkey_algo) && sig->version < 4 )
|
|
write_sign_packet_header(out, ctb, iobuf_get_temp_length(a) );
|
|
else
|
|
write_header(out, ctb, iobuf_get_temp_length(a) );
|
|
if( iobuf_write_temp( out, a ) )
|
|
rc = G10ERR_WRITE_FILE;
|
|
|
|
iobuf_close(a);
|
|
return rc;
|
|
}
|
|
|
|
|
|
static int
|
|
do_onepass_sig( IOBUF out, int ctb, PKT_onepass_sig *ops )
|
|
{
|
|
int rc = 0;
|
|
IOBUF a = iobuf_temp();
|
|
|
|
write_version( a, ctb );
|
|
iobuf_put(a, ops->sig_class );
|
|
iobuf_put(a, ops->digest_algo );
|
|
iobuf_put(a, ops->pubkey_algo );
|
|
write_32(a, ops->keyid[0] );
|
|
write_32(a, ops->keyid[1] );
|
|
iobuf_put(a, ops->last );
|
|
|
|
write_header(out, ctb, iobuf_get_temp_length(a) );
|
|
if( iobuf_write_temp( out, a ) )
|
|
rc = G10ERR_WRITE_FILE;
|
|
|
|
iobuf_close(a);
|
|
return rc;
|
|
}
|
|
|
|
|
|
static int
|
|
write_16(IOBUF out, u16 a)
|
|
{
|
|
iobuf_put(out, a>>8);
|
|
if( iobuf_put(out,a) )
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
write_32(IOBUF out, u32 a)
|
|
{
|
|
iobuf_put(out, a>> 24);
|
|
iobuf_put(out, a>> 16);
|
|
iobuf_put(out, a>> 8);
|
|
if( iobuf_put(out, a) )
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/****************
|
|
* calculate the length of a header
|
|
*/
|
|
static int
|
|
calc_header_length( u32 len, int new_ctb )
|
|
{
|
|
if( !len )
|
|
return 1; /* only the ctb */
|
|
|
|
if( new_ctb ) {
|
|
if( len < 192 )
|
|
return 2;
|
|
if( len < 8384 )
|
|
return 3;
|
|
else
|
|
return 6;
|
|
}
|
|
if( len < 256 )
|
|
return 2;
|
|
if( len < 65536 )
|
|
return 3;
|
|
|
|
return 5;
|
|
}
|
|
|
|
/****************
|
|
* Write the CTB and the packet length
|
|
*/
|
|
static int
|
|
write_header( IOBUF out, int ctb, u32 len )
|
|
{
|
|
return write_header2( out, ctb, len, 0, 1 );
|
|
}
|
|
|
|
|
|
static int
|
|
write_sign_packet_header( IOBUF out, int ctb, u32 len )
|
|
{
|
|
/* work around a bug in the pgp read function for signature packets,
|
|
* which are not correctly coded and silently assume at some
|
|
* point 2 byte length headers.*/
|
|
iobuf_put(out, 0x89 );
|
|
iobuf_put(out, len >> 8 );
|
|
return iobuf_put(out, len ) == -1 ? -1:0;
|
|
}
|
|
|
|
/****************
|
|
* if HDRLEN is > 0, try to build a header of this length.
|
|
* we need this, so that we can hash packets without reading them again.
|
|
*/
|
|
static int
|
|
write_header2( IOBUF out, int ctb, u32 len, int hdrlen, int blkmode )
|
|
{
|
|
if( ctb & 0x40 )
|
|
return write_new_header( out, ctb, len, hdrlen );
|
|
|
|
if( hdrlen ) {
|
|
if( !len )
|
|
ctb |= 3;
|
|
else if( hdrlen == 2 && len < 256 )
|
|
;
|
|
else if( hdrlen == 3 && len < 65536 )
|
|
ctb |= 1;
|
|
else
|
|
ctb |= 2;
|
|
}
|
|
else {
|
|
if( !len )
|
|
ctb |= 3;
|
|
else if( len < 256 )
|
|
;
|
|
else if( len < 65536 )
|
|
ctb |= 1;
|
|
else
|
|
ctb |= 2;
|
|
}
|
|
if( iobuf_put(out, ctb ) )
|
|
return -1;
|
|
if( !len ) {
|
|
if( blkmode )
|
|
iobuf_set_block_mode(out, 8196 );
|
|
}
|
|
else {
|
|
if( ctb & 2 ) {
|
|
iobuf_put(out, len >> 24 );
|
|
iobuf_put(out, len >> 16 );
|
|
}
|
|
if( ctb & 3 )
|
|
iobuf_put(out, len >> 8 );
|
|
if( iobuf_put(out, len ) )
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
write_new_header( IOBUF out, int ctb, u32 len, int hdrlen )
|
|
{
|
|
if( hdrlen )
|
|
log_bug("can't cope with hdrlen yet\n");
|
|
|
|
if( iobuf_put(out, ctb ) )
|
|
return -1;
|
|
if( !len ) {
|
|
iobuf_set_partial_block_mode(out, 512 );
|
|
}
|
|
else {
|
|
if( len < 192 ) {
|
|
if( iobuf_put(out, len ) )
|
|
return -1;
|
|
}
|
|
else if( len < 8384 ) {
|
|
len -= 192;
|
|
if( iobuf_put( out, (len / 256) + 192) )
|
|
return -1;
|
|
if( iobuf_put( out, (len % 256) ) )
|
|
return -1;
|
|
}
|
|
else {
|
|
if( iobuf_put( out, 0xff ) )
|
|
return -1;
|
|
if( iobuf_put( out, (len >> 24)&0xff ) )
|
|
return -1;
|
|
if( iobuf_put( out, (len >> 16)&0xff ) )
|
|
return -1;
|
|
if( iobuf_put( out, (len >> 8)&0xff ) )
|
|
return -1;
|
|
if( iobuf_put( out, len & 0xff ) )
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
write_version( IOBUF out, int ctb )
|
|
{
|
|
if( iobuf_put( out, 3 ) )
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|