mirror of
git://git.gnupg.org/gnupg.git
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195 lines
4.9 KiB
C
195 lines
4.9 KiB
C
/* revoke.c
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* Copyright (C) 1998 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 "options.h"
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#include "packet.h"
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#include "errors.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 "ttyio.h"
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#include "status.h"
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#include "i18n.h"
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/****************
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* Generate a revocation certificate for UNAME
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*/
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int
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gen_revoke( const char *uname )
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{
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int rc = 0;
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armor_filter_context_t afx;
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compress_filter_context_t zfx;
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PACKET pkt;
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PKT_secret_key *sk; /* used as pointer into a kbnode */
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PKT_public_key *pk = NULL;
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PKT_signature *sig = NULL;
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u32 sk_keyid[2];
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IOBUF out = NULL;
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KBNODE keyblock = NULL;
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KBNODE node;
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KBPOS kbpos;
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if( opt.batch ) {
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log_error(_("sorry, can't do this in batch mode\n"));
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return G10ERR_GENERAL;
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}
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memset( &afx, 0, sizeof afx);
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memset( &zfx, 0, sizeof zfx);
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init_packet( &pkt );
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/* search the userid */
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rc = find_secret_keyblock_byname( &kbpos, uname );
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if( rc ) {
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log_error(_("secret key for user '%s' not found\n"), uname );
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goto leave;
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}
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/* read the keyblock */
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rc = read_keyblock( &kbpos, &keyblock );
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if( rc ) {
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log_error(_("error reading the certificate: %s\n"), g10_errstr(rc) );
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goto leave;
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}
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/* get the keyid from the keyblock */
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node = find_kbnode( keyblock, PKT_SECRET_KEY );
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if( !node ) { /* maybe better to use log_bug ? */
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log_error(_("Oops; secret key not found anymore!\n"));
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rc = G10ERR_GENERAL;
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goto leave;
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}
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/* fixme: should make a function out of this stuff,
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* it's used all over the source */
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sk = node->pkt->pkt.secret_key;
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keyid_from_sk( sk, sk_keyid );
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tty_printf("\nsec %4u%c/%08lX %s ",
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nbits_from_sk( sk ),
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pubkey_letter( sk->pubkey_algo ),
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sk_keyid[1], datestr_from_sk(sk) );
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{
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size_t n;
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char *p = get_user_id( sk_keyid, &n );
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tty_print_string( p, n );
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m_free(p);
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tty_printf("\n");
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}
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pk = m_alloc_clear( sizeof *pk );
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rc = get_pubkey( pk, sk_keyid );
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if( rc ) {
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log_error(_("no corresponding public key: %s\n"), g10_errstr(rc) );
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goto leave;
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}
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if( cmp_public_secret_key( pk, sk ) ) {
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log_error(_("public key does not match secret key!\n") );
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rc = G10ERR_GENERAL;
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goto leave;
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}
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tty_printf("\n");
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if( !cpr_get_answer_is_yes(N_("gen_revoke.okay"),
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_("Create a revocation certificate for this key? ")) ){
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rc = 0;
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goto leave;
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}
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switch( is_secret_key_protected( sk ) ) {
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case -1:
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log_error(_("unknown protection algorithm\n"));
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rc = G10ERR_PUBKEY_ALGO;
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break;
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case 0:
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tty_printf(_("note: This key is not protected!\n"));
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break;
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default:
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rc = check_secret_key( sk, 0 );
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break;
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}
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if( rc )
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goto leave;
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if( !opt.armor )
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tty_printf(_("ASCII armored output forced.\n"));
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if( (rc = open_outfile( NULL, 0, &out )) )
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goto leave;
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afx.what = 1;
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afx.hdrlines = "Comment: A revocation certificate should follow\n";
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iobuf_push_filter( out, armor_filter, &afx );
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if( opt.compress )
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iobuf_push_filter( out, compress_filter, &zfx );
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/* create it */
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rc = make_keysig_packet( &sig, pk, NULL, NULL, sk, 0x20, 0, NULL, NULL);
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if( rc ) {
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log_error(_("make_keysig_packet failed: %s\n"), g10_errstr(rc));
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goto leave;
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}
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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 ) {
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log_error(_("build_packet failed: %s\n"), g10_errstr(rc) );
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goto leave;
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}
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/* and issue a usage notice */
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tty_printf(_("Revocation certificate created.\n\n"
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"Please move it to a medium which you can hide away; if Mallory gets\n"
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"access to this certificate he can use it to make your key unusable.\n"
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"It is smart to print this certificate and store it away, just in case\n"
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"your media become unreadable. But have some caution: The print system of\n"
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"your machine might store the data and make it available to others!\n"));
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leave:
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if( pk )
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free_public_key( pk );
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if( sig )
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free_seckey_enc( sig );
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release_kbnode( keyblock );
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if( rc )
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iobuf_cancel(out);
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else
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iobuf_close(out);
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return rc;
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}
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