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gnupg/g10/keyedit.c
1998-05-03 15:42:08 +00:00

732 lines
18 KiB
C

/* keyedit.c - keyedit stuff
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "filter.h"
#include "ttyio.h"
#include "i18n.h"
static void
show_fingerprint( PKT_public_cert *pkc )
{
byte *array, *p;
size_t i, n;
p = array = fingerprint_from_pkc( pkc, &n );
tty_printf(" Fingerprint:");
if( n == 20 ) {
for(i=0; i < n ; i++, i++, p += 2 ) {
if( i == 10 )
tty_printf(" ");
tty_printf(" %02X%02X", *p, p[1] );
}
}
else {
for(i=0; i < n ; i++, p++ ) {
if( i && !(i%8) )
tty_printf(" ");
tty_printf(" %02X", *p );
}
}
tty_printf("\n");
m_free(array);
}
/****************
* Ask whether the user is willing to sign the key. Return true if so.
*/
static int
sign_it_p( PKT_public_cert *pkc, PKT_user_id *uid )
{
char *answer;
int yes;
tty_printf("\nAre you really sure that you want to sign this key:\n\n"
"%4u%c/%08lX %s ",
nbits_from_pkc( pkc ),
pubkey_letter( pkc->pubkey_algo ),
(ulong)keyid_from_pkc( pkc, NULL ),
datestr_from_pkc( pkc ) );
tty_print_string( uid->name, uid->len );
tty_printf("\n");
show_fingerprint(pkc);
tty_printf("\n");
answer = tty_get("Sign this key? ");
tty_kill_prompt();
yes = answer_is_yes(answer);
m_free(answer);
return yes;
}
/****************
* Check the keysigs and set the flags to indicate errors.
* Usage of nodes flag bits:
* Bit 0 = bad signature
* 1 = no public key
* 2 = other error
* Returns true if error found.
*/
static int
check_all_keysigs( KBNODE keyblock )
{
KBNODE kbctx;
KBNODE node;
int rc;
int inv_sigs = 0;
int no_key = 0;
int oth_err = 0;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 0)) ; ) {
if( node->pkt->pkttype == PKT_SIGNATURE
&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
PKT_signature *sig = node->pkt->pkt.signature;
int sigrc;
tty_printf("sig");
switch( (rc = check_key_signature( keyblock, node,NULL)) ) {
case 0: node->flag = 0; sigrc = '!'; break;
case G10ERR_BAD_SIGN: inv_sigs++; node->flag = 1; sigrc = '-'; break;
case G10ERR_NO_PUBKEY: no_key++; node->flag = 2; sigrc = '?'; break;
default: oth_err++; node->flag = 4; sigrc = '%'; break;
}
tty_printf("%c %08lX %s ",
sigrc, sig->keyid[1], datestr_from_sig(sig));
if( sigrc == '%' )
tty_printf("[%s] ", g10_errstr(rc) );
else if( sigrc == '?' )
;
else {
size_t n;
char *p = get_user_id( sig->keyid, &n );
tty_print_string( p, n > 40? 40 : n );
m_free(p);
}
tty_printf("\n");
/* FIXME: update the trustdb */
}
}
if( inv_sigs )
tty_printf("%d bad signatures\n", inv_sigs );
if( no_key )
tty_printf("No public key for %d signatures\n", no_key );
if( oth_err )
tty_printf("%d signatures not checked due to errors\n", oth_err );
return inv_sigs || no_key || oth_err;
}
/****************
* Ask and remove invalid signatures that are to be removed.
*/
static int
remove_keysigs( KBNODE keyblock, u32 *keyid, int all )
{
KBNODE kbctx;
KBNODE node;
char *answer;
int yes;
int count;
count = 0;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 0)) ; ) {
if( ((node->flag & 7) || all )
&& node->pkt->pkttype == PKT_SIGNATURE
&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
PKT_signature *sig = node->pkt->pkt.signature;
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] ) {
/* fixme: skip self-sig */
}
tty_printf("\n \"%08lX %s ",
sig->keyid[1], datestr_from_sig(sig));
if( node->flag & 6 )
tty_printf("[User name not available] ");
else {
size_t n;
char *p = get_user_id( sig->keyid, &n );
tty_print_string( p, n );
m_free(p);
}
tty_printf("\"\n");
if( node->flag & 1 )
tty_printf("This is a BAD signature!\n");
else if( node->flag & 2 )
tty_printf("Public key not available.\n");
else if( node->flag & 4 )
tty_printf("The signature could not be checked!\n");
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] )
continue; /* do not remove self-signatures */
answer = tty_get("\nRemove this signature? ");
tty_kill_prompt();
if( answer_is_yes(answer) ) {
node->flag |= 128; /* use bit 7 to mark this node */
count++;
}
m_free(answer);
}
}
if( !count )
return 0; /* nothing to remove */
answer = tty_get("Do you really want to remove the selected signatures? ");
tty_kill_prompt();
yes = answer_is_yes(answer);
m_free(answer);
if( !yes )
return 0;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 1)) ; ) {
if( node->flag & 128)
delete_kbnode(node );
}
return 1;
}
/****************
* This function signs the key of USERNAME with all users listed in
* LOCUSR. If LOCUSR is NULL the default secret certificate will
* be used. This works on all keyrings, so there is no armor or
* compress stuff here.
*/
int
sign_key( const char *username, STRLIST locusr )
{
md_filter_context_t mfx;
int rc = 0;
SKC_LIST skc_list = NULL;
SKC_LIST skc_rover = NULL;
KBNODE keyblock = NULL;
KBNODE kbctx, node;
KBPOS kbpos;
PKT_public_cert *pkc;
u32 pkc_keyid[2];
char *answer;
memset( &mfx, 0, sizeof mfx);
/* search the userid */
rc = find_keyblock_byname( &kbpos, username );
if( rc ) {
log_error("user '%s' not found\n", username );
goto leave;
}
/* build a list of all signators */
rc=build_skc_list( locusr, &skc_list, 0, 1 );
if( rc )
goto leave;
/* read the keyblock */
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("error reading the certificate: %s\n", g10_errstr(rc) );
goto leave;
}
/* get the keyid from the keyblock */
node = find_kbnode( keyblock, PKT_PUBLIC_CERT );
if( !node ) {
log_error("Oops; public key not found anymore!\n");
rc = G10ERR_GENERAL;
goto leave;
}
pkc = node->pkt->pkt.public_cert;
keyid_from_pkc( pkc, pkc_keyid );
log_info("Checking signatures of this public key certificate:\n");
tty_printf("pub %4u%c/%08lX %s ",
nbits_from_pkc( pkc ),
pubkey_letter( pkc->pubkey_algo ),
pkc_keyid[1], datestr_from_pkc(pkc) );
{
size_t n;
char *p = get_user_id( pkc_keyid, &n );
tty_print_string( p, n > 40? 40 : n );
m_free(p);
tty_printf("\n");
}
clear_kbnode_flags( keyblock );
if( check_all_keysigs( keyblock ) ) {
if( !opt.batch ) {
/* ask whether we really should do anything */
answer = tty_get("To you want to remove some of the invalid sigs? ");
tty_kill_prompt();
if( answer_is_yes(answer) )
remove_keysigs( keyblock, pkc_keyid, 0 );
m_free(answer);
}
}
/* check whether we it is possible to sign this key */
for( skc_rover = skc_list; skc_rover; skc_rover = skc_rover->next ) {
u32 akeyid[2];
keyid_from_skc( skc_rover->skc, akeyid );
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 0)) ; ) {
if( node->pkt->pkttype == PKT_USER_ID )
skc_rover->mark = 1;
else if( node->pkt->pkttype == PKT_SIGNATURE
&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
if( akeyid[0] == node->pkt->pkt.signature->keyid[0]
&& akeyid[1] == node->pkt->pkt.signature->keyid[1] ) {
log_info("Already signed by keyid %08lX\n",
(ulong)akeyid[1] );
skc_rover->mark = 0;
}
}
}
}
for( skc_rover = skc_list; skc_rover; skc_rover = skc_rover->next ) {
if( skc_rover->mark )
break;
}
if( !skc_rover ) {
log_info("Nothing to sign\n");
goto leave;
}
/* Loop over all signers and all user ids and sign */
/* FIXME: we have to change it: Present all user-ids and
* then ask whether all those ids shall be signed if the user
* answers yes, go and make a 0x14 sign class packet and remove
* old one-user-id-only-sigs (user should be noted of this
* condition while presenting the user-ids); if he had answered
* no, present each user-id in turn and ask which one should be signed
* (only one) - if there is already a single-user-sig, do nothing.
* (this is propably already out in the world) */
for( skc_rover = skc_list; skc_rover; skc_rover = skc_rover->next ) {
if( !skc_rover->mark )
continue;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 0)) ; ) {
if( node->pkt->pkttype == PKT_USER_ID ) {
if( sign_it_p( pkc, node->pkt->pkt.user_id ) ) {
PACKET *pkt;
PKT_signature *sig;
rc = make_keysig_packet( &sig, pkc,
node->pkt->pkt.user_id,
skc_rover->skc,
0x10,
DIGEST_ALGO_RMD160 );
if( rc ) {
log_error("make_keysig_packet failed: %s\n", g10_errstr(rc));
goto leave;
}
pkt = m_alloc_clear( sizeof *pkt );
pkt->pkttype = PKT_SIGNATURE;
pkt->pkt.signature = sig;
insert_kbnode( node, new_kbnode(pkt), PKT_USER_ID );
}
}
}
}
rc = update_keyblock( &kbpos, keyblock );
if( rc ) {
log_error("update_keyblock failed: %s\n", g10_errstr(rc) );
goto leave;
}
leave:
release_kbnode( keyblock );
release_skc_list( skc_list );
md_close( mfx.md );
return rc;
}
int
edit_keysigs( const char *username )
{
int rc = 0;
KBNODE keyblock = NULL;
KBNODE node;
KBPOS kbpos;
PKT_public_cert *pkc;
u32 pkc_keyid[2];
/* search the userid */
rc = find_keyblock_byname( &kbpos, username );
if( rc ) {
log_error("%s: user not found\n", username );
goto leave;
}
/* read the keyblock */
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("%s: certificate read problem: %s\n", username, g10_errstr(rc) );
goto leave;
}
/* get the keyid from the keyblock */
node = find_kbnode( keyblock, PKT_PUBLIC_CERT );
if( !node ) {
log_error("Oops; public key not found anymore!\n");
rc = G10ERR_GENERAL;
goto leave;
}
pkc = node->pkt->pkt.public_cert;
keyid_from_pkc( pkc, pkc_keyid );
log_info("Checking signatures of this public key certificate:\n");
tty_printf("pub %4u%c/%08lX %s ",
nbits_from_pkc( pkc ),
pubkey_letter( pkc->pubkey_algo ),
pkc_keyid[1], datestr_from_pkc(pkc) );
{
size_t n;
char *p = get_user_id( pkc_keyid, &n );
tty_print_string( p, n > 40? 40 : n );
m_free(p);
tty_printf("\n");
}
clear_kbnode_flags( keyblock );
check_all_keysigs( keyblock );
if( remove_keysigs( keyblock, pkc_keyid, 1 ) ) {
rc = update_keyblock( &kbpos, keyblock );
if( rc ) {
log_error("update_keyblock failed: %s\n", g10_errstr(rc) );
goto leave;
}
}
leave:
release_kbnode( keyblock );
return rc;
}
/****************
* Delete a public or secret key from a keyring.
*/
int
delete_key( const char *username, int secret )
{
int rc = 0;
KBNODE keyblock = NULL;
KBNODE node;
KBPOS kbpos;
PKT_public_cert *pkc = NULL;
PKT_secret_cert *skc = NULL;
u32 keyid[2];
int okay=0;
/* search the userid */
rc = secret? find_secret_keyblock_byname( &kbpos, username )
: find_keyblock_byname( &kbpos, username );
if( rc ) {
log_error("%s: user not found\n", username );
goto leave;
}
/* read the keyblock */
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("%s: read problem: %s\n", username, g10_errstr(rc) );
goto leave;
}
/* get the keyid from the keyblock */
node = find_kbnode( keyblock, secret? PKT_SECRET_CERT:PKT_PUBLIC_CERT );
if( !node ) {
log_error("Oops; key not found anymore!\n");
rc = G10ERR_GENERAL;
goto leave;
}
if( secret ) {
skc = node->pkt->pkt.secret_cert;
keyid_from_skc( skc, keyid );
}
else {
pkc = node->pkt->pkt.public_cert;
keyid_from_pkc( pkc, keyid );
rc = seckey_available( keyid );
if( !rc ) {
log_error(_(
"there is a secret key for this public key!\n"));
log_info(_(
"use option \"--delete-secret-key\" to delete it first.\n"));
rc = -1;
}
else if( rc != G10ERR_NO_SECKEY )
log_error("%s: get secret key: %s\n", username, g10_errstr(rc) );
else
rc = 0;
}
if( rc )
rc = 0;
else if( opt.batch && secret )
log_error(_("can't do that in batch-mode\n"));
else if( opt.batch && opt.answer_yes )
okay++;
else if( opt.batch )
log_error(_("can't do that in batch-mode without \"--yes\"\n"));
else {
char *p;
size_t n;
if( secret )
tty_printf("sec %4u%c/%08lX %s ",
nbits_from_skc( skc ),
pubkey_letter( skc->pubkey_algo ),
keyid[1], datestr_from_skc(skc) );
else
tty_printf("pub %4u%c/%08lX %s ",
nbits_from_pkc( pkc ),
pubkey_letter( pkc->pubkey_algo ),
keyid[1], datestr_from_pkc(pkc) );
p = get_user_id( keyid, &n );
tty_print_string( p, n );
m_free(p);
tty_printf("\n\n");
p = tty_get(_("Delete this key from the keyring? "));
tty_kill_prompt();
if( secret && answer_is_yes(p)) {
/* I think it is not required to check a passphrase; if
* the user is so stupid as to let others access his secret keyring
* (and has no backup) - it is up him to read some very
* basic texts about security.
*/
m_free(p);
p = tty_get(_("This is a secret key! - really delete? "));
}
if( answer_is_yes(p) )
okay++;
m_free(p);
}
if( okay ) {
rc = delete_keyblock( &kbpos );
if( rc ) {
log_error("delete_keyblock failed: %s\n", g10_errstr(rc) );
goto leave;
}
}
leave:
release_kbnode( keyblock );
return rc;
}
int
change_passphrase( const char *username )
{
int rc = 0;
KBNODE keyblock = NULL;
KBNODE node;
KBPOS kbpos;
PKT_secret_cert *skc;
u32 skc_keyid[2];
char *answer;
int changed=0;
/* find the userid */
rc = find_secret_keyblock_byname( &kbpos, username );
if( rc ) {
log_error("secret key for user '%s' not found\n", username );
goto leave;
}
/* read the keyblock */
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("error reading the certificate: %s\n", g10_errstr(rc) );
goto leave;
}
/* get the keyid from the keyblock */
node = find_kbnode( keyblock, PKT_SECRET_CERT );
if( !node ) {
log_error("Oops; secret key not found anymore!\n");
rc = G10ERR_GENERAL;
goto leave;
}
skc = node->pkt->pkt.secret_cert;
keyid_from_skc( skc, skc_keyid );
tty_printf("sec %4u%c/%08lX %s ",
nbits_from_skc( skc ),
pubkey_letter( skc->pubkey_algo ),
skc_keyid[1], datestr_from_skc(skc) );
{
size_t n;
char *p = get_user_id( skc_keyid, &n );
tty_print_string( p, n );
m_free(p);
tty_printf("\n");
}
clear_kbnode_flags( keyblock );
switch( is_secret_key_protected( skc ) ) {
case -1:
rc = G10ERR_PUBKEY_ALGO;
break;
case 0:
tty_printf("This key is not protected.\n");
break;
default:
tty_printf("Key is protected.\n");
rc = check_secret_key( skc );
break;
}
if( rc )
tty_printf("Can't edit this key: %s\n", g10_errstr(rc));
else {
DEK *dek = m_alloc_secure( sizeof *dek );
STRING2KEY *s2k = m_alloc_secure( sizeof *s2k );
tty_printf( "Enter the new passphrase for this secret key.\n\n" );
for(;;) {
dek->algo = CIPHER_ALGO_BLOWFISH;
s2k->mode = 1;
s2k->hash_algo = DIGEST_ALGO_RMD160;
rc = make_dek_from_passphrase( dek , 2, s2k );
if( rc == -1 ) {
rc = 0;
tty_printf( "You don't want a passphrase -"
" this is probably a *bad* idea!\n\n");
answer = tty_get("Do you really want to do this? ");
tty_kill_prompt();
if( answer_is_yes(answer) )
changed++;
m_free(answer);
break;
}
else if( rc == G10ERR_PASSPHRASE ) {
tty_printf("passphrase not correctly repeated; try again.\n");
}
else if( rc ) {
m_free(dek); dek = NULL;
log_error("Error getting the passphrase: %s\n", g10_errstr(rc));
break;
}
else { /* okay */
skc->protect.algo = dek->algo;
skc->protect.s2k = *s2k;
rc = protect_secret_key( skc, dek );
if( rc )
log_error("protect_secret_key failed: %s\n", g10_errstr(rc) );
else
changed++;
break;
}
}
m_free(s2k);
m_free(dek);
}
if( changed ) {
rc = update_keyblock( &kbpos, keyblock );
if( rc ) {
log_error("update_keyblock failed: %s\n", g10_errstr(rc) );
goto leave;
}
}
leave:
release_kbnode( keyblock );
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)
*/
int
make_keysig_packet( PKT_signature **ret_sig, PKT_public_cert *pkc,
PKT_user_id *uid, PKT_secret_cert *skc,
int sigclass, int digest_algo )
{
PKT_signature *sig;
int rc=0;
MD_HANDLE md;
assert( (sigclass >= 0x10 && sigclass <= 0x13) || sigclass == 0x20 );
md = md_open( digest_algo, 0 );
/* hash the public key certificate and the user id */
hash_public_cert( md, pkc );
if( sigclass != 0x20 )
md_write( md, uid->name, uid->len );
/* and make the signature packet */
sig = m_alloc_clear( sizeof *sig );
sig->pubkey_algo = skc->pubkey_algo;
sig->timestamp = make_timestamp();
sig->sig_class = sigclass;
md_putc( md, sig->sig_class );
{ u32 a = sig->timestamp;
md_putc( md, (a >> 24) & 0xff );
md_putc( md, (a >> 16) & 0xff );
md_putc( md, (a >> 8) & 0xff );
md_putc( md, a & 0xff );
}
md_final(md);
rc = complete_sig( sig, skc, md );
md_close( md );
if( rc )
free_seckey_enc( sig );
else
*ret_sig = sig;
return rc;
}