mirror of
git://git.gnupg.org/gnupg.git
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1099 lines
30 KiB
C
1099 lines
30 KiB
C
/* sign.c - sign data
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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 <errno.h>
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#include <assert.h>
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#include <unistd.h> /* need sleep() */
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#include "options.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 "keydb.h"
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#include "memory.h"
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#include "util.h"
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#include "main.h"
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#include "filter.h"
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#include "ttyio.h"
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#include "trustdb.h"
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#include "status.h"
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#include "i18n.h"
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#ifdef HAVE_DOSISH_SYSTEM
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#define LF "\r\n"
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void __stdcall Sleep(ulong);
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#define sleep(a) Sleep((a)*1000)
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#else
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#define LF "\n"
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#endif
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/****************
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* Create a notation. It is assumed that the stings in STRLIST
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* are already checked to contain only printable data and have a valid
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* NAME=VALUE format.
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*/
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static void
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mk_notation_and_policy( PKT_signature *sig )
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{
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const char *string, *s;
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byte *buf;
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unsigned n1, n2;
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/* notation data */
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if( opt.notation_data && sig->version < 4 )
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log_info("can't put notation data into v3 signatures\n");
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else if( opt.notation_data ) {
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STRLIST nd = opt.notation_data;
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for( ; nd; nd = nd->next ) {
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string = nd->d;
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s = strchr( string, '=' );
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if( !s )
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BUG(); /* we have already parsed this */
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n1 = s - string;
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s++;
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n2 = strlen(s);
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buf = m_alloc( 8 + n1 + n2 );
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buf[0] = 0x80; /* human readable */
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buf[1] = buf[2] = buf[3] = 0;
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buf[4] = n1 >> 8;
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buf[5] = n1;
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buf[6] = n2 >> 8;
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buf[7] = n2;
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memcpy(buf+8, string, n1 );
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memcpy(buf+8+n1, s, n2 );
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build_sig_subpkt( sig, SIGSUBPKT_NOTATION
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| ((nd->flags & 1)? SIGSUBPKT_FLAG_CRITICAL:0),
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buf, 8+n1+n2 );
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}
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}
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/* set policy URL */
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if( (s=opt.set_policy_url) ) {
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if( *s == '!' )
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build_sig_subpkt( sig, SIGSUBPKT_POLICY | SIGSUBPKT_FLAG_CRITICAL,
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s+1, strlen(s+1) );
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else
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build_sig_subpkt( sig, SIGSUBPKT_POLICY, s, strlen(s) );
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}
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}
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/*
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* Helper to hash a user ID packet.
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*/
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static void
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hash_uid (MD_HANDLE md, int sigversion, const PKT_user_id *uid)
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{
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if ( sigversion >= 4 ) {
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byte buf[5];
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buf[0] = 0xb4; /* indicates a userid packet */
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buf[1] = uid->len >> 24; /* always use 4 length bytes */
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buf[2] = uid->len >> 16;
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buf[3] = uid->len >> 8;
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buf[4] = uid->len;
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md_write( md, buf, 5 );
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}
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md_write (md, uid->name, uid->len );
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}
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/*
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* Helper to hash some parts from the signature
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*/
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static void
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hash_sigversion_to_magic (MD_HANDLE md, const PKT_signature *sig)
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{
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if (sig->version >= 4)
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md_putc (md, sig->version);
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md_putc (md, sig->sig_class);
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if (sig->version < 4) {
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u32 a = sig->timestamp;
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md_putc (md, (a >> 24) & 0xff );
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md_putc (md, (a >> 16) & 0xff );
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md_putc (md, (a >> 8) & 0xff );
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md_putc (md, a & 0xff );
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}
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else {
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byte buf[6];
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size_t n;
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md_putc (md, sig->pubkey_algo);
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md_putc (md, sig->digest_algo);
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if (sig->hashed) {
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n = sig->hashed->len;
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md_putc (md, (n >> 8) );
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md_putc (md, n );
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md_write (md, sig->hashed->data, n );
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n += 6;
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}
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else {
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md_putc (md, 0); /* always hash the length of the subpacket*/
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md_putc (md, 0);
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n = 6;
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}
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/* add some magic */
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buf[0] = sig->version;
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buf[1] = 0xff;
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buf[2] = n >> 24; /* hmmm, n is only 16 bit, so this is always 0 */
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buf[3] = n >> 16;
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buf[4] = n >> 8;
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buf[5] = n;
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md_write (md, buf, 6);
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}
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}
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static int
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do_sign( PKT_secret_key *sk, PKT_signature *sig,
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MD_HANDLE md, int digest_algo )
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{
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MPI frame;
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byte *dp;
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int rc;
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if( sk->timestamp > sig->timestamp ) {
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ulong d = sk->timestamp - sig->timestamp;
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log_info( d==1 ? _("key has been created %lu second "
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"in future (time warp or clock problem)\n")
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: _("key has been created %lu seconds "
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"in future (time warp or clock problem)\n"), d );
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if( !opt.ignore_time_conflict )
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return G10ERR_TIME_CONFLICT;
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}
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print_pubkey_algo_note(sk->pubkey_algo);
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if( !digest_algo )
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digest_algo = md_get_algo(md);
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print_digest_algo_note( digest_algo );
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dp = md_read( md, digest_algo );
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sig->digest_algo = digest_algo;
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sig->digest_start[0] = dp[0];
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sig->digest_start[1] = dp[1];
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frame = encode_md_value( sk->pubkey_algo, md,
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digest_algo, mpi_get_nbits(sk->skey[0]), 0 );
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rc = pubkey_sign( sk->pubkey_algo, sig->data, frame, sk->skey );
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mpi_free(frame);
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if (!rc && !opt.no_sig_create_check) {
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/* check that the signature verification worked and nothing is
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* fooling us e.g. by a bug in the signature create
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* code or by deliberately introduced faults. */
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PKT_public_key *pk = m_alloc_clear (sizeof *pk);
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if( get_pubkey( pk, sig->keyid ) )
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rc = G10ERR_NO_PUBKEY;
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else {
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frame = encode_md_value (pk->pubkey_algo, md,
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sig->digest_algo,
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mpi_get_nbits(pk->pkey[0]), 0);
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rc = pubkey_verify (pk->pubkey_algo, frame, sig->data, pk->pkey,
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NULL, NULL );
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mpi_free (frame);
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}
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if (rc)
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log_error (_("checking created signature failed: %s\n"),
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g10_errstr (rc));
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free_public_key (pk);
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}
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if( rc )
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log_error(_("signing failed: %s\n"), g10_errstr(rc) );
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else {
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if( opt.verbose ) {
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char *ustr = get_user_id_string( sig->keyid );
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log_info(_("%s signature from: %s\n"),
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pubkey_algo_to_string(sk->pubkey_algo), ustr );
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m_free(ustr);
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}
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}
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return rc;
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}
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int
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complete_sig( PKT_signature *sig, PKT_secret_key *sk, MD_HANDLE md )
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{
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int rc=0;
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if( !(rc=check_secret_key( sk, 0 )) )
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rc = do_sign( sk, sig, md, 0 );
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return rc;
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}
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static int
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hash_for(int pubkey_algo, int packet_version )
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{
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if( opt.def_digest_algo )
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return opt.def_digest_algo;
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if( pubkey_algo == PUBKEY_ALGO_DSA )
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return DIGEST_ALGO_SHA1;
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if( pubkey_algo == PUBKEY_ALGO_RSA && packet_version < 4 )
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return DIGEST_ALGO_MD5;
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return DEFAULT_DIGEST_ALGO;
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}
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static int
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only_old_style( SK_LIST sk_list )
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{
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SK_LIST sk_rover = NULL;
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int old_style = 0;
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/* if there are only old style capable key we use the old sytle */
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for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
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PKT_secret_key *sk = sk_rover->sk;
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if( sk->pubkey_algo == PUBKEY_ALGO_RSA && sk->version < 4 )
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old_style = 1;
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else
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return 0;
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}
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return old_style;
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}
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static void
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print_status_sig_created ( PKT_secret_key *sk, PKT_signature *sig, int what )
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{
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byte array[MAX_FINGERPRINT_LEN], *p;
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char buf[100+MAX_FINGERPRINT_LEN*2];
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size_t i, n;
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sprintf(buf, "%c %d %d %02x %lu ",
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what, sig->pubkey_algo, sig->digest_algo, sig->sig_class,
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(ulong)sig->timestamp );
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fingerprint_from_sk( sk, array, &n );
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p = buf + strlen(buf);
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for(i=0; i < n ; i++ )
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sprintf(p+2*i, "%02X", array[i] );
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write_status_text( STATUS_SIG_CREATED, buf );
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}
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/*
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* Loop over the secret certificates in SK_LIST and build the one pass
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* signature packets. OpenPGP says that the data should be bracket by
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* the onepass-sig and signature-packet; so we build these onepass
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* packet here in reverse order
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*/
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static int
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write_onepass_sig_packets (SK_LIST sk_list, IOBUF out, int sigclass )
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{
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int skcount;
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SK_LIST sk_rover;
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for (skcount=0, sk_rover=sk_list; sk_rover; sk_rover = sk_rover->next)
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skcount++;
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for (; skcount; skcount--) {
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PKT_secret_key *sk;
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PKT_onepass_sig *ops;
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PACKET pkt;
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int i, rc;
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for (i=0, sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
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if (++i == skcount)
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break;
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}
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sk = sk_rover->sk;
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ops = m_alloc_clear (sizeof *ops);
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ops->sig_class = sigclass;
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ops->digest_algo = hash_for (sk->pubkey_algo, sk->version);
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ops->pubkey_algo = sk->pubkey_algo;
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keyid_from_sk (sk, ops->keyid);
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ops->last = (skcount == 1);
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init_packet(&pkt);
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pkt.pkttype = PKT_ONEPASS_SIG;
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pkt.pkt.onepass_sig = ops;
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rc = build_packet (out, &pkt);
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free_packet (&pkt);
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if (rc) {
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log_error ("build onepass_sig packet failed: %s\n",
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g10_errstr(rc));
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return rc;
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}
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}
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return 0;
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}
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/*
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* Helper to write the plaintext (literal data) packet
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*/
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static int
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write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
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{
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PKT_plaintext *pt = NULL;
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u32 filesize;
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int rc = 0;
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if (!opt.no_literal) {
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if (fname || opt.set_filename) {
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char *s = make_basename (opt.set_filename? opt.set_filename
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: fname);
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pt = m_alloc (sizeof *pt + strlen(s) - 1);
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pt->namelen = strlen (s);
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memcpy (pt->name, s, pt->namelen);
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m_free (s);
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}
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else { /* no filename */
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pt = m_alloc (sizeof *pt - 1);
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pt->namelen = 0;
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}
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}
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/* try to calculate the length of the data */
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if (fname) {
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if( !(filesize = iobuf_get_filelength(inp)) )
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log_info (_("WARNING: `%s' is an empty file\n"), fname);
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/* we can't yet encode the length of very large files,
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* so we switch to partial length encoding in this case */
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if (filesize >= IOBUF_FILELENGTH_LIMIT)
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filesize = 0;
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/* because the text_filter modifies the length of the
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* data, it is not possible to know the used length
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* without a double read of the file - to avoid that
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* we simple use partial length packets.
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*/
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if ( ptmode == 't' )
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filesize = 0;
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}
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else {
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filesize = opt.set_filesize? opt.set_filesize : 0; /* stdin */
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}
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if (!opt.no_literal) {
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PACKET pkt;
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pt->timestamp = make_timestamp ();
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pt->mode = ptmode;
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pt->len = filesize;
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pt->new_ctb = !pt->len && !opt.rfc1991;
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pt->buf = inp;
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init_packet(&pkt);
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pkt.pkttype = PKT_PLAINTEXT;
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pkt.pkt.plaintext = pt;
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/*cfx.datalen = filesize? calc_packet_length( &pkt ) : 0;*/
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if( (rc = build_packet (out, &pkt)) )
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log_error ("build_packet(PLAINTEXT) failed: %s\n",
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g10_errstr(rc) );
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pt->buf = NULL;
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}
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else {
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byte copy_buffer[4096];
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int bytes_copied;
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while ((bytes_copied = iobuf_read(inp, copy_buffer, 4096)) != -1)
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if (iobuf_write(out, copy_buffer, bytes_copied) == -1) {
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rc = G10ERR_WRITE_FILE;
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log_error ("copying input to output failed: %s\n",
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g10_errstr(rc));
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break;
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}
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memset(copy_buffer, 0, 4096); /* burn buffer */
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}
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/* fixme: it seems that we never freed pt/pkt */
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return rc;
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}
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/*
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* Write the signatures from the SK_LIST to OUT. HASH must be a non-finalized
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* hash which will not be changes here.
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*/
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static int
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write_signature_packets (SK_LIST sk_list, IOBUF out, MD_HANDLE hash,
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int sigclass, int old_style, int status_letter)
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{
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SK_LIST sk_rover;
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/* loop over the secret certificates */
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for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next) {
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PKT_secret_key *sk;
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PKT_signature *sig;
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MD_HANDLE md;
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int rc;
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sk = sk_rover->sk;
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/* build the signature packet */
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sig = m_alloc_clear (sizeof *sig);
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sig->version = (old_style || opt.force_v3_sigs)? 3 : sk->version;
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keyid_from_sk (sk, sig->keyid);
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sig->digest_algo = hash_for (sk->pubkey_algo, sk->version);
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sig->pubkey_algo = sk->pubkey_algo;
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sig->timestamp = make_timestamp();
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sig->sig_class = sigclass;
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md = md_copy (hash);
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if (sig->version >= 4)
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build_sig_subpkt_from_sig (sig);
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mk_notation_and_policy (sig);
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hash_sigversion_to_magic (md, sig);
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md_final (md);
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rc = do_sign( sk, sig, md, hash_for (sig->pubkey_algo, sk->version) );
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md_close (md);
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if( !rc ) { /* and write it */
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PACKET pkt;
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init_packet(&pkt);
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pkt.pkttype = PKT_SIGNATURE;
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pkt.pkt.signature = sig;
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rc = build_packet (out, &pkt);
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if (!rc && is_status_enabled()) {
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print_status_sig_created ( sk, sig, status_letter);
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}
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free_packet (&pkt);
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if (rc)
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log_error ("build signature packet failed: %s\n",
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g10_errstr(rc) );
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}
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if( rc )
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return rc;;
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}
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return 0;
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}
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/****************
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* Sign the files whose names are in FILENAME.
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* If DETACHED has the value true,
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* make a detached signature. If FILENAMES->d is NULL read from stdin
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* and ignore the detached mode. Sign the file with all secret keys
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* which can be taken from LOCUSR, if this is NULL, use the default one
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* If ENCRYPTFLAG is true, use REMUSER (or ask if it is NULL) to encrypt the
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* signed data for these users.
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* If OUTFILE is not NULL; this file is used for output and the function
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* does not ask for overwrite permission; output is then always
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* uncompressed, non-armored and in binary mode.
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*/
|
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int
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|
sign_file( STRLIST filenames, int detached, STRLIST locusr,
|
|
int encryptflag, STRLIST remusr, const char *outfile )
|
|
{
|
|
const char *fname;
|
|
armor_filter_context_t afx;
|
|
compress_filter_context_t zfx;
|
|
md_filter_context_t mfx;
|
|
text_filter_context_t tfx;
|
|
encrypt_filter_context_t efx;
|
|
IOBUF inp = NULL, out = NULL;
|
|
PACKET pkt;
|
|
int rc = 0;
|
|
PK_LIST pk_list = NULL;
|
|
SK_LIST sk_list = NULL;
|
|
SK_LIST sk_rover = NULL;
|
|
int multifile = 0;
|
|
int old_style = opt.rfc1991;
|
|
int compr_algo = -1; /* unknown */
|
|
|
|
|
|
memset( &afx, 0, sizeof afx);
|
|
memset( &zfx, 0, sizeof zfx);
|
|
memset( &mfx, 0, sizeof mfx);
|
|
memset( &tfx, 0, sizeof tfx);
|
|
memset( &efx, 0, sizeof efx);
|
|
init_packet( &pkt );
|
|
|
|
if( filenames ) {
|
|
fname = filenames->d;
|
|
multifile = !!filenames->next;
|
|
}
|
|
else
|
|
fname = NULL;
|
|
|
|
if( fname && filenames->next && (!detached || encryptflag) )
|
|
log_bug("multiple files can only be detached signed");
|
|
|
|
if( (rc=build_sk_list( locusr, &sk_list, 1, PUBKEY_USAGE_SIG )) )
|
|
goto leave;
|
|
if( !old_style )
|
|
old_style = only_old_style( sk_list );
|
|
|
|
if( encryptflag ) {
|
|
if( (rc=build_pk_list( remusr, &pk_list, PUBKEY_USAGE_ENC )) )
|
|
goto leave;
|
|
if( !old_style )
|
|
compr_algo = select_algo_from_prefs( pk_list, PREFTYPE_ZIP );
|
|
}
|
|
|
|
/* prepare iobufs */
|
|
if( multifile ) /* have list of filenames */
|
|
inp = NULL; /* we do it later */
|
|
else if( !(inp = iobuf_open(fname)) ) {
|
|
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
|
|
strerror(errno) );
|
|
rc = G10ERR_OPEN_FILE;
|
|
goto leave;
|
|
}
|
|
|
|
if( outfile ) {
|
|
if( !(out = iobuf_create( outfile )) ) {
|
|
log_error(_("can't create %s: %s\n"), outfile, strerror(errno) );
|
|
rc = G10ERR_CREATE_FILE;
|
|
goto leave;
|
|
}
|
|
else if( opt.verbose )
|
|
log_info(_("writing to `%s'\n"), outfile );
|
|
}
|
|
else if( (rc = open_outfile( fname, opt.armor? 1: detached? 2:0, &out )))
|
|
goto leave;
|
|
|
|
/* prepare to calculate the MD over the input */
|
|
if( opt.textmode && !outfile )
|
|
iobuf_push_filter( inp, text_filter, &tfx );
|
|
mfx.md = md_open(0, 0);
|
|
|
|
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
|
|
PKT_secret_key *sk = sk_rover->sk;
|
|
md_enable(mfx.md, hash_for(sk->pubkey_algo, sk->version ));
|
|
}
|
|
|
|
if( !multifile )
|
|
iobuf_push_filter( inp, md_filter, &mfx );
|
|
|
|
if( detached && !encryptflag && !opt.rfc1991 )
|
|
afx.what = 2;
|
|
|
|
if( opt.armor && !outfile )
|
|
iobuf_push_filter( out, armor_filter, &afx );
|
|
|
|
if( encryptflag ) {
|
|
efx.pk_list = pk_list;
|
|
/* fixme: set efx.cfx.datalen if known */
|
|
iobuf_push_filter( out, encrypt_filter, &efx );
|
|
}
|
|
|
|
if( opt.compress && !outfile && ( !detached || opt.compress_sigs) ) {
|
|
if( !compr_algo )
|
|
; /* don't use compression */
|
|
else {
|
|
if( old_style
|
|
|| compr_algo == 1
|
|
|| (compr_algo == -1 && !encryptflag) )
|
|
zfx.algo = 1; /* use the non optional algorithm */
|
|
iobuf_push_filter( out, compress_filter, &zfx );
|
|
}
|
|
}
|
|
|
|
/* Write the one-pass signature packets if needed */
|
|
if (!detached && !old_style) {
|
|
rc = write_onepass_sig_packets (sk_list, out,
|
|
opt.textmode && !outfile ? 0x01:0x00);
|
|
if (rc)
|
|
goto leave;
|
|
}
|
|
|
|
/* setup the inner packet */
|
|
if( detached ) {
|
|
if( multifile ) {
|
|
STRLIST sl;
|
|
|
|
if( opt.verbose )
|
|
log_info(_("signing:") );
|
|
/* must walk reverse trough this list */
|
|
for( sl = strlist_last(filenames); sl;
|
|
sl = strlist_prev( filenames, sl ) ) {
|
|
if( !(inp = iobuf_open(sl->d)) ) {
|
|
log_error(_("can't open %s: %s\n"),
|
|
sl->d, strerror(errno) );
|
|
rc = G10ERR_OPEN_FILE;
|
|
goto leave;
|
|
}
|
|
if( opt.verbose )
|
|
fprintf(stderr, " `%s'", sl->d );
|
|
iobuf_push_filter( inp, md_filter, &mfx );
|
|
while( iobuf_get(inp) != -1 )
|
|
;
|
|
iobuf_close(inp); inp = NULL;
|
|
}
|
|
if( opt.verbose )
|
|
putc( '\n', stderr );
|
|
}
|
|
else {
|
|
/* read, so that the filter can calculate the digest */
|
|
while( iobuf_get(inp) != -1 )
|
|
;
|
|
}
|
|
}
|
|
else {
|
|
rc = write_plaintext_packet (out, inp, fname,
|
|
opt.textmode && !outfile ? 't':'b');
|
|
}
|
|
|
|
/* catch errors from above */
|
|
if (rc)
|
|
goto leave;
|
|
|
|
/* write the signatures */
|
|
rc = write_signature_packets (sk_list, out, mfx.md,
|
|
opt.textmode && !outfile? 0x01 : 0x00,
|
|
old_style, detached ? 'D':'S');
|
|
if( rc )
|
|
goto leave;
|
|
|
|
|
|
leave:
|
|
if( rc )
|
|
iobuf_cancel(out);
|
|
else {
|
|
iobuf_close(out);
|
|
if (encryptflag)
|
|
write_status( STATUS_END_ENCRYPTION );
|
|
}
|
|
iobuf_close(inp);
|
|
md_close( mfx.md );
|
|
release_sk_list( sk_list );
|
|
release_pk_list( pk_list );
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/****************
|
|
* make a clear signature. note that opt.armor is not needed
|
|
*/
|
|
int
|
|
clearsign_file( const char *fname, STRLIST locusr, const char *outfile )
|
|
{
|
|
armor_filter_context_t afx;
|
|
MD_HANDLE textmd = NULL;
|
|
IOBUF inp = NULL, out = NULL;
|
|
PACKET pkt;
|
|
int rc = 0;
|
|
SK_LIST sk_list = NULL;
|
|
SK_LIST sk_rover = NULL;
|
|
int old_style = opt.rfc1991;
|
|
int only_md5 = 0;
|
|
|
|
memset( &afx, 0, sizeof afx);
|
|
init_packet( &pkt );
|
|
|
|
if( (rc=build_sk_list( locusr, &sk_list, 1, PUBKEY_USAGE_SIG )) )
|
|
goto leave;
|
|
if( !old_style )
|
|
old_style = only_old_style( sk_list );
|
|
|
|
/* prepare iobufs */
|
|
if( !(inp = iobuf_open(fname)) ) {
|
|
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
|
|
strerror(errno) );
|
|
rc = G10ERR_OPEN_FILE;
|
|
goto leave;
|
|
}
|
|
|
|
if( outfile ) {
|
|
if( !(out = iobuf_create( outfile )) ) {
|
|
log_error(_("can't create %s: %s\n"), outfile, strerror(errno) );
|
|
rc = G10ERR_CREATE_FILE;
|
|
goto leave;
|
|
}
|
|
else if( opt.verbose )
|
|
log_info(_("writing to `%s'\n"), outfile );
|
|
}
|
|
else if( (rc = open_outfile( fname, 1, &out )) )
|
|
goto leave;
|
|
|
|
iobuf_writestr(out, "-----BEGIN PGP SIGNED MESSAGE-----" LF );
|
|
|
|
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
|
|
PKT_secret_key *sk = sk_rover->sk;
|
|
if( hash_for(sk->pubkey_algo, sk->version) == DIGEST_ALGO_MD5 )
|
|
only_md5 = 1;
|
|
else {
|
|
only_md5 = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( old_style && only_md5 )
|
|
iobuf_writestr(out, LF );
|
|
else {
|
|
const char *s;
|
|
int any = 0;
|
|
byte hashs_seen[256];
|
|
|
|
memset( hashs_seen, 0, sizeof hashs_seen );
|
|
iobuf_writestr(out, "Hash: " );
|
|
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
|
|
PKT_secret_key *sk = sk_rover->sk;
|
|
int i = hash_for(sk->pubkey_algo, sk->version);
|
|
|
|
if( !hashs_seen[ i & 0xff ] ) {
|
|
s = digest_algo_to_string( i );
|
|
if( s ) {
|
|
hashs_seen[ i & 0xff ] = 1;
|
|
if( any )
|
|
iobuf_put(out, ',' );
|
|
iobuf_writestr(out, s );
|
|
any = 1;
|
|
}
|
|
}
|
|
}
|
|
assert(any);
|
|
iobuf_writestr(out, LF );
|
|
if( opt.not_dash_escaped )
|
|
iobuf_writestr( out,
|
|
"NotDashEscaped: You need GnuPG to verify this message" LF );
|
|
iobuf_writestr(out, LF );
|
|
}
|
|
|
|
|
|
textmd = md_open(0, 0);
|
|
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
|
|
PKT_secret_key *sk = sk_rover->sk;
|
|
md_enable(textmd, hash_for(sk->pubkey_algo, sk->version));
|
|
}
|
|
if ( DBG_HASHING )
|
|
md_start_debug( textmd, "clearsign" );
|
|
copy_clearsig_text( out, inp, textmd,
|
|
!opt.not_dash_escaped, opt.escape_from, old_style );
|
|
/* fixme: check for read errors */
|
|
|
|
/* now write the armor */
|
|
afx.what = 2;
|
|
iobuf_push_filter( out, armor_filter, &afx );
|
|
|
|
/* write the signatures */
|
|
rc = write_signature_packets (sk_list, out, textmd,
|
|
0x01, old_style, 'C');
|
|
if( rc )
|
|
goto leave;
|
|
|
|
leave:
|
|
if( rc )
|
|
iobuf_cancel(out);
|
|
else
|
|
iobuf_close(out);
|
|
iobuf_close(inp);
|
|
md_close( textmd );
|
|
release_sk_list( sk_list );
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Sign and conventionally encrypt the given file.
|
|
* FIXME: Far too much code is duplicated - revamp the whole file.
|
|
*/
|
|
int
|
|
sign_symencrypt_file (const char *fname, STRLIST locusr)
|
|
{
|
|
armor_filter_context_t afx;
|
|
compress_filter_context_t zfx;
|
|
md_filter_context_t mfx;
|
|
text_filter_context_t tfx;
|
|
cipher_filter_context_t cfx;
|
|
IOBUF inp = NULL, out = NULL;
|
|
PACKET pkt;
|
|
STRING2KEY *s2k = NULL;
|
|
int rc = 0;
|
|
SK_LIST sk_list = NULL;
|
|
SK_LIST sk_rover = NULL;
|
|
int old_style = opt.rfc1991;
|
|
int compr_algo = -1; /* unknown */
|
|
int algo;
|
|
|
|
memset( &afx, 0, sizeof afx);
|
|
memset( &zfx, 0, sizeof zfx);
|
|
memset( &mfx, 0, sizeof mfx);
|
|
memset( &tfx, 0, sizeof tfx);
|
|
memset( &cfx, 0, sizeof cfx);
|
|
init_packet( &pkt );
|
|
|
|
rc = build_sk_list (locusr, &sk_list, 1, PUBKEY_USAGE_SIG);
|
|
if (rc)
|
|
goto leave;
|
|
if( !old_style )
|
|
old_style = only_old_style( sk_list );
|
|
|
|
/* prepare iobufs */
|
|
inp = iobuf_open(fname);
|
|
if( !inp ) {
|
|
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
|
|
strerror(errno) );
|
|
rc = G10ERR_OPEN_FILE;
|
|
goto leave;
|
|
}
|
|
|
|
/* prepare key */
|
|
s2k = m_alloc_clear( sizeof *s2k );
|
|
s2k->mode = opt.rfc1991? 0:opt.s2k_mode;
|
|
s2k->hash_algo = opt.def_digest_algo ? opt.def_digest_algo
|
|
: opt.s2k_digest_algo;
|
|
|
|
algo = opt.def_cipher_algo ? opt.def_cipher_algo : opt.s2k_cipher_algo;
|
|
if (!opt.quiet || !opt.batch)
|
|
log_info (_("%s encryption will be used\n"),
|
|
cipher_algo_to_string(algo) );
|
|
cfx.dek = passphrase_to_dek( NULL, 0, algo, s2k, 2 );
|
|
|
|
if (!cfx.dek || !cfx.dek->keylen) {
|
|
rc = G10ERR_PASSPHRASE;
|
|
log_error(_("error creating passphrase: %s\n"), g10_errstr(rc) );
|
|
goto leave;
|
|
}
|
|
|
|
/* now create the outfile */
|
|
rc = open_outfile (fname, opt.armor? 1:0, &out);
|
|
if (rc)
|
|
goto leave;
|
|
|
|
/* prepare to calculate the MD over the input */
|
|
if (opt.textmode)
|
|
iobuf_push_filter (inp, text_filter, &tfx);
|
|
mfx.md = md_open(0, 0);
|
|
|
|
for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next) {
|
|
PKT_secret_key *sk = sk_rover->sk;
|
|
md_enable (mfx.md, hash_for (sk->pubkey_algo, sk->version ));
|
|
}
|
|
|
|
iobuf_push_filter (inp, md_filter, &mfx);
|
|
|
|
/* Push armor output filter */
|
|
if (opt.armor)
|
|
iobuf_push_filter (out, armor_filter, &afx);
|
|
|
|
/* Write the symmetric key packet */
|
|
/*(current filters: armor)*/
|
|
if (!opt.rfc1991) {
|
|
PKT_symkey_enc *enc = m_alloc_clear( sizeof *enc );
|
|
enc->version = 4;
|
|
enc->cipher_algo = cfx.dek->algo;
|
|
enc->s2k = *s2k;
|
|
pkt.pkttype = PKT_SYMKEY_ENC;
|
|
pkt.pkt.symkey_enc = enc;
|
|
if( (rc = build_packet( out, &pkt )) )
|
|
log_error("build symkey packet failed: %s\n", g10_errstr(rc) );
|
|
m_free(enc);
|
|
}
|
|
|
|
/* Push the encryption filter */
|
|
iobuf_push_filter( out, cipher_filter, &cfx );
|
|
|
|
/* Push the Zip filter */
|
|
if (opt.compress) {
|
|
if (!compr_algo)
|
|
; /* don't use compression */
|
|
else {
|
|
if( old_style || compr_algo == 1 )
|
|
zfx.algo = 1; /* use the non optional algorithm */
|
|
iobuf_push_filter( out, compress_filter, &zfx );
|
|
}
|
|
}
|
|
|
|
/* Write the one-pass signature packets */
|
|
/*(current filters: zip - encrypt - armor)*/
|
|
if (!old_style) {
|
|
rc = write_onepass_sig_packets (sk_list, out,
|
|
opt.textmode? 0x01:0x00);
|
|
if (rc)
|
|
goto leave;
|
|
}
|
|
|
|
/* Pipe data through all filters; i.e. write the signed stuff */
|
|
/*(current filters: zip - encrypt - armor)*/
|
|
rc = write_plaintext_packet (out, inp, fname, opt.textmode ? 't':'b');
|
|
if (rc)
|
|
goto leave;
|
|
|
|
/* Write the signatures */
|
|
/*(current filters: zip - encrypt - armor)*/
|
|
rc = write_signature_packets (sk_list, out, mfx.md,
|
|
opt.textmode? 0x01 : 0x00,
|
|
old_style, 'S');
|
|
if( rc )
|
|
goto leave;
|
|
|
|
|
|
leave:
|
|
if( rc )
|
|
iobuf_cancel(out);
|
|
else {
|
|
iobuf_close(out);
|
|
write_status( STATUS_END_ENCRYPTION );
|
|
}
|
|
iobuf_close(inp);
|
|
release_sk_list( sk_list );
|
|
md_close( mfx.md );
|
|
m_free(cfx.dek);
|
|
m_free(s2k);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/****************
|
|
* Create a signature packet for the given public key certificate and
|
|
* the user id and return it in ret_sig. User signature class SIGCLASS
|
|
* user-id is not used (and may be NULL if sigclass is 0x20) If
|
|
* DIGEST_ALGO is 0 the function selects an appropriate one.
|
|
* SIGVERSION gives the minimal required signature packet version;
|
|
* this is needed so that special properties like local sign are not
|
|
* applied (actually: dropped) when a v3 key is used.
|
|
*/
|
|
int
|
|
make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
|
|
PKT_user_id *uid, PKT_public_key *subpk,
|
|
PKT_secret_key *sk,
|
|
int sigclass, int digest_algo,
|
|
int sigversion,
|
|
int (*mksubpkt)(PKT_signature *, void *), void *opaque
|
|
)
|
|
{
|
|
PKT_signature *sig;
|
|
int rc=0;
|
|
MD_HANDLE md;
|
|
|
|
assert( (sigclass >= 0x10 && sigclass <= 0x13)
|
|
|| sigclass == 0x20 || sigclass == 0x18
|
|
|| sigclass == 0x30 || sigclass == 0x28 );
|
|
|
|
if (sigversion < sk->version)
|
|
sigversion = sk->version;
|
|
|
|
if( !digest_algo ) {
|
|
switch( sk->pubkey_algo ) {
|
|
case PUBKEY_ALGO_DSA: digest_algo = DIGEST_ALGO_SHA1; break;
|
|
case PUBKEY_ALGO_RSA_S:
|
|
case PUBKEY_ALGO_RSA: digest_algo = DIGEST_ALGO_MD5; break;
|
|
default: digest_algo = DIGEST_ALGO_RMD160; break;
|
|
}
|
|
}
|
|
md = md_open( digest_algo, 0 );
|
|
|
|
/* hash the public key certificate and the user id */
|
|
hash_public_key( md, pk );
|
|
if( sigclass == 0x18 || sigclass == 0x28 ) { /* subkey binding/revocation*/
|
|
hash_public_key( md, subpk );
|
|
}
|
|
else if( sigclass != 0x20 ) {
|
|
hash_uid (md, sigversion, uid);
|
|
}
|
|
/* and make the signature packet */
|
|
sig = m_alloc_clear( sizeof *sig );
|
|
sig->version = sigversion;
|
|
keyid_from_sk( sk, sig->keyid );
|
|
sig->pubkey_algo = sk->pubkey_algo;
|
|
sig->digest_algo = digest_algo;
|
|
sig->timestamp = make_timestamp();
|
|
sig->sig_class = sigclass;
|
|
if( sig->version >= 4 )
|
|
build_sig_subpkt_from_sig( sig );
|
|
|
|
if( sig->version >= 4 && mksubpkt )
|
|
rc = (*mksubpkt)( sig, opaque );
|
|
|
|
if( !rc ) {
|
|
mk_notation_and_policy( sig );
|
|
hash_sigversion_to_magic (md, sig);
|
|
md_final(md);
|
|
|
|
rc = complete_sig( sig, sk, md );
|
|
}
|
|
|
|
md_close( md );
|
|
if( rc )
|
|
free_seckey_enc( sig );
|
|
else
|
|
*ret_sig = sig;
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/****************
|
|
* Create a new signature packet based on an existing one.
|
|
* Only user ID signatures are supported for now.
|
|
* TODO: Merge this with make_keysig_packet.
|
|
*/
|
|
int
|
|
update_keysig_packet( PKT_signature **ret_sig,
|
|
PKT_signature *orig_sig,
|
|
PKT_public_key *pk,
|
|
PKT_user_id *uid,
|
|
PKT_secret_key *sk,
|
|
int (*mksubpkt)(PKT_signature *, void *),
|
|
void *opaque
|
|
)
|
|
{
|
|
PKT_signature *sig;
|
|
int rc=0;
|
|
MD_HANDLE md;
|
|
|
|
if (!orig_sig || !pk || !uid || !sk)
|
|
return G10ERR_GENERAL;
|
|
if (orig_sig->sig_class < 0x10 || orig_sig->sig_class > 0x13 )
|
|
return G10ERR_GENERAL;
|
|
|
|
md = md_open( orig_sig->digest_algo, 0 );
|
|
|
|
/* hash the public key certificate and the user id */
|
|
hash_public_key( md, pk );
|
|
hash_uid (md, orig_sig->version, uid);
|
|
|
|
/* create a new signature packet */
|
|
sig = copy_signature (NULL, orig_sig);
|
|
if ( sig->version >= 4 && mksubpkt)
|
|
rc = (*mksubpkt)(sig, opaque);
|
|
|
|
/* we increase the timestamp by one second so that a future import
|
|
of this key will replace the existing one. We also make sure that
|
|
we don't create a timestamp in the future */
|
|
sig->timestamp++;
|
|
while (sig->timestamp >= make_timestamp())
|
|
sleep (1);
|
|
/* put the updated timestamp back into the data */
|
|
if( sig->version >= 4 )
|
|
build_sig_subpkt_from_sig( sig );
|
|
|
|
if (!rc) {
|
|
hash_sigversion_to_magic (md, sig);
|
|
md_final(md);
|
|
|
|
rc = complete_sig( sig, sk, md );
|
|
}
|
|
|
|
md_close (md);
|
|
if( rc )
|
|
free_seckey_enc (sig);
|
|
else
|
|
*ret_sig = sig;
|
|
return rc;
|
|
}
|
|
|
|
|