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gnupg/g10/sig-check.c

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/* sig-check.c - Check a signature
* 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 <assert.h>
#include <gcrypt.h>
#include "util.h"
#include "packet.h"
#include "memory.h"
#include "keydb.h"
#include "main.h"
#include "status.h"
#include "i18n.h"
struct cmp_help_context_s {
PKT_signature *sig;
GCRY_MD_HD md;
};
static int do_signature_check( PKT_signature *sig, GCRY_MD_HD digest,
u32 *r_expire );
static int do_check( PKT_public_key *pk, PKT_signature *sig,
GCRY_MD_HD digest );
/****************
* Emulate our old PK interface here - sometime in the future we might
* change the internal design to directly fit to libgcrypt.
*/
static int
pk_verify( int algo, MPI hash, MPI *data, MPI *pkey,
int (*cmp)(void *, MPI), void *opaque )
{
GCRY_SEXP s_sig, s_hash, s_pkey;
int rc;
/* forget about cmp and opaque - we never used it */
/* make a sexp from pkey */
if( algo == GCRY_PK_DSA ) {
s_pkey = SEXP_CONS( SEXP_NEW( "public-key", 10 ),
gcry_sexp_vlist( SEXP_NEW( "dsa", 3 ),
gcry_sexp_new_name_mpi( "p", pkey[0] ),
gcry_sexp_new_name_mpi( "q", pkey[1] ),
gcry_sexp_new_name_mpi( "g", pkey[2] ),
gcry_sexp_new_name_mpi( "y", pkey[3] ),
NULL ));
}
else if( algo == GCRY_PK_ELG || algo == GCRY_PK_ELG_E ) {
s_pkey = SEXP_CONS( SEXP_NEW( "public-key", 10 ),
gcry_sexp_vlist( SEXP_NEW( "elg", 3 ),
gcry_sexp_new_name_mpi( "p", pkey[0] ),
gcry_sexp_new_name_mpi( "g", pkey[1] ),
gcry_sexp_new_name_mpi( "y", pkey[2] ),
NULL ));
}
else if( algo == GCRY_PK_RSA ) {
s_pkey = SEXP_CONS( SEXP_NEW( "public-key", 10 ),
gcry_sexp_vlist( SEXP_NEW( "rsa", 3 ),
gcry_sexp_new_name_mpi( "n", pkey[0] ),
gcry_sexp_new_name_mpi( "e", pkey[1] ),
NULL ));
}
else
return G10ERR_PUBKEY_ALGO;
/* put hash into a S-Exp s_hash */
s_hash = gcry_sexp_new_mpi( hash );
/* put data into a S-Exp s_sig */
if( algo == GCRY_PK_DSA ) {
s_sig = SEXP_CONS( SEXP_NEW( "sig-val", 0 ),
gcry_sexp_vlist( SEXP_NEW( "dsa", 0 ),
gcry_sexp_new_name_mpi( "r", data[0] ),
gcry_sexp_new_name_mpi( "s", data[1] ),
NULL ));
}
else if( algo == GCRY_PK_ELG || algo == GCRY_PK_ELG_E ) {
s_sig = SEXP_CONS( SEXP_NEW( "sig-val", 0 ),
gcry_sexp_vlist( SEXP_NEW( "elg", 0 ),
gcry_sexp_new_name_mpi( "r", data[0] ),
gcry_sexp_new_name_mpi( "s", data[1] ),
NULL ));
}
else if( algo == GCRY_PK_RSA ) {
s_sig = SEXP_CONS( SEXP_NEW( "sig-val", 0 ),
gcry_sexp_vlist( SEXP_NEW( "rsa", 3 ),
gcry_sexp_new_name_mpi( "s", data[0] ),
NULL ));
}
else
BUG();
rc = gcry_pk_verify( s_sig, s_hash, s_pkey );
gcry_sexp_release( s_sig );
gcry_sexp_release( s_hash );
gcry_sexp_release( s_pkey );
return rc;
}
/****************
* Check the signature which is contained in SIG.
* The GCRY_MD_HD should be currently open, so that this function
* is able to append some data, before finalizing the digest.
*/
int
signature_check( PKT_signature *sig, GCRY_MD_HD digest )
{
u32 dummy;
return do_signature_check( sig, digest, &dummy );
}
static int
do_signature_check( PKT_signature *sig, GCRY_MD_HD digest, u32 *r_expire )
{
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
int rc=0;
if( is_RSA(sig->pubkey_algo) )
write_status(STATUS_RSA_OR_IDEA);
*r_expire = 0;
if( get_pubkey( pk, sig->keyid ) )
rc = G10ERR_NO_PUBKEY;
else {
*r_expire = pk->expiredate;
rc = do_check( pk, sig, digest );
}
free_public_key( pk );
if( !rc && sig->sig_class < 2 && is_status_enabled() ) {
/* This signature id works best with DLP algorithms because
* they use a random parameter for every signature. Instead of
* this sig-id we could have also used the hash of the document
* and the timestamp, but the drawback of this is, that it is
* not possible to sign more than one identical document within
* one second. Some remote bacth processing applications might
* like this feature here */
GCRY_MD_HD md;
u32 a = sig->timestamp;
int i, nsig = pubkey_get_nsig( sig->pubkey_algo );
byte *p, *buffer;
if( !(md = gcry_md_open( GCRY_MD_RMD160, 0)) )
BUG();
gcry_md_putc( digest, sig->pubkey_algo );
gcry_md_putc( digest, sig->digest_algo );
gcry_md_putc( digest, (a >> 24) & 0xff );
gcry_md_putc( digest, (a >> 16) & 0xff );
gcry_md_putc( digest, (a >> 8) & 0xff );
gcry_md_putc( digest, a & 0xff );
for(i=0; i < nsig; i++ ) {
unsigned n = mpi_get_nbits( sig->data[i]);
gcry_md_putc( md, n>>8);
gcry_md_putc( md, n );
p = mpi_get_buffer( sig->data[i], &n, NULL );
gcry_md_write( md, p, n );
m_free(p);
}
gcry_md_final( md );
p = make_radix64_string( gcry_md_read( md, 0 ), 20 );
buffer = m_alloc( strlen(p) + 60 );
sprintf( buffer, "%s %s %lu",
p, strtimestamp( sig->timestamp ), (ulong)sig->timestamp );
write_status_text( STATUS_SIG_ID, buffer );
m_free(buffer);
m_free(p);
gcry_md_close(md);
}
return rc;
}
#if 0 /* not anymore used */
/****************
* Check the MDC which is contained in SIG.
* The GCRY_MD_HD should be currently open, so that this function
* is able to append some data, before finalizing the digest.
*/
int
mdc_kludge_check( PKT_signature *sig, GCRY_MD_HD digest )
{
int rc=0;
if( (rc=check_digest_algo(sig->digest_algo)) )
return rc;
/* make sure the digest algo is enabled (in case of a detached mdc??) */
md_enable( digest, sig->digest_algo );
/* complete the digest */
if( sig->version >= 4 )
gcry_md_putc( digest, sig->version );
gcry_md_putc( digest, sig->sig_class );
if( sig->version < 4 ) {
u32 a = sig->timestamp;
gcry_md_putc( digest, (a >> 24) & 0xff );
gcry_md_putc( digest, (a >> 16) & 0xff );
gcry_md_putc( digest, (a >> 8) & 0xff );
gcry_md_putc( digest, a & 0xff );
}
else {
byte buf[6];
size_t n;
gcry_md_putc( digest, sig->pubkey_algo );
gcry_md_putc( digest, sig->digest_algo );
if( sig->hashed_data ) {
n = (sig->hashed_data[0] << 8) | sig->hashed_data[1];
gcry_md_write( digest, sig->hashed_data, n+2 );
n += 6;
}
else
n = 6;
/* add some magic */
buf[0] = sig->version;
buf[1] = 0xff;
buf[2] = n >> 24;
buf[3] = n >> 16;
buf[4] = n >> 8;
buf[5] = n;
gcry_md_write( digest, buf, 6 );
}
md_final( digest );
rc = G10ERR_BAD_SIGN;
{ const byte *s1 = md_read( digest, sig->digest_algo );
int s1len = md_digest_length( sig->digest_algo );
log_hexdump( "MDC calculated", s1, s1len );
if( !sig->data[0] )
log_debug("sig_data[0] is NULL\n");
else {
unsigned s2len;
byte *s2;
s2 = mpi_get_buffer( sig->data[0], &s2len, NULL );
log_hexdump( "MDC stored ", s2, s2len );
if( s2len != s1len )
log_debug("MDC check: len differ: %d/%d\n", s1len, s2len);
else if( memcmp( s1, s2, s1len ) )
log_debug("MDC check: hashs differ\n");
else
rc = 0;
m_free(s2);
}
}
if( !rc && sig->flags.unknown_critical ) {
log_info(_("assuming bad MDC due to an unknown critical bit\n"));
rc = G10ERR_BAD_SIGN;
}
sig->flags.checked = 1;
sig->flags.valid = !rc;
/* FIXME: check that we are actually in an encrypted packet */
return rc;
}
#endif
/****************
* This function gets called by pubkey_verify() if the algorithm needs it.
*/
static int
cmp_help( void *opaque, MPI result )
{
#if 0 /* we do not use this anymore */
int rc=0, i, j, c, old_enc;
byte *dp;
const byte *asn;
size_t mdlen, asnlen;
struct cmp_help_context_s *ctx = opaque;
PKT_signature *sig = ctx->sig;
GCRY_MD_HD digest = ctx->md;
old_enc = 0;
for(i=j=0; (c=mpi_getbyte(result, i)) != -1; i++ ) {
if( !j ) {
if( !i && c != 1 )
break;
else if( i && c == 0xff )
; /* skip the padding */
else if( i && !c )
j++;
else
break;
}
else if( ++j == 18 && c != 1 )
break;
else if( j == 19 && c == 0 ) {
old_enc++;
break;
}
}
if( old_enc ) {
log_error("old encoding scheme is not supported\n");
return G10ERR_GENERAL;
}
if( (rc=check_digest_algo(sig->digest_algo)) )
return rc; /* unsupported algo */
asn = md_asn_oid( sig->digest_algo, &asnlen, &mdlen );
for(i=mdlen,j=asnlen-1; (c=mpi_getbyte(result, i)) != -1 && j >= 0;
i++, j-- )
if( asn[j] != c )
break;
if( j != -1 || mpi_getbyte(result, i) )
return G10ERR_BAD_PUBKEY; /* ASN is wrong */
for(i++; (c=mpi_getbyte(result, i)) != -1; i++ )
if( c != 0xff )
break;
i++;
if( c != sig->digest_algo || mpi_getbyte(result, i) ) {
/* Padding or leading bytes in signature is wrong */
return G10ERR_BAD_PUBKEY;
}
if( mpi_getbyte(result, mdlen-1) != sig->digest_start[0]
|| mpi_getbyte(result, mdlen-2) != sig->digest_start[1] ) {
/* Wrong key used to check the signature */
return G10ERR_BAD_PUBKEY;
}
dp = md_read( digest, sig->digest_algo );
for(i=mdlen-1; i >= 0; i--, dp++ ) {
if( mpi_getbyte( result, i ) != *dp )
return G10ERR_BAD_SIGN;
}
return 0;
#else
return -1;
#endif
}
static int
do_check( PKT_public_key *pk, PKT_signature *sig, GCRY_MD_HD digest )
{
MPI result = NULL;
int rc=0;
struct cmp_help_context_s ctx;
u32 cur_time;
if( pk->version == 4 && pk->pubkey_algo == GCRY_PK_ELG_E ) {
log_info(_("this is a PGP generated "
"ElGamal key which is NOT secure for signatures!\n"));
return G10ERR_PUBKEY_ALGO;
}
if( pk->timestamp > sig->timestamp ) {
ulong d = pk->timestamp - sig->timestamp;
log_info( d==1
? _("public key is %lu second newer than the signature\n")
: _("public key is %lu seconds newer than the signature\n"),
d );
return G10ERR_TIME_CONFLICT; /* pubkey newer than signature */
}
cur_time = make_timestamp();
if( pk->timestamp > cur_time ) {
ulong d = pk->timestamp - cur_time;
log_info( d==1 ? _("key has been created %lu second "
"in future (time warp or clock problem)\n")
: _("key has been created %lu seconds "
"in future (time warp or clock problem)\n"), d );
return G10ERR_TIME_CONFLICT;
}
if( pk->expiredate && pk->expiredate < cur_time ) {
log_info(_("NOTE: signature key expired %s\n"),
asctimestamp( pk->expiredate ) );
write_status(STATUS_SIGEXPIRED);
}
if( (rc=openpgp_md_test_algo(sig->digest_algo)) )
return rc;
if( (rc=openpgp_pk_test_algo(sig->pubkey_algo, 0)) )
return rc;
/* make sure the digest algo is enabled (in case of a detached signature)*/
gcry_md_enable( digest, sig->digest_algo );
/* complete the digest */
if( sig->version >= 4 )
gcry_md_putc( digest, sig->version );
gcry_md_putc( digest, sig->sig_class );
if( sig->version < 4 ) {
u32 a = sig->timestamp;
gcry_md_putc( digest, (a >> 24) & 0xff );
gcry_md_putc( digest, (a >> 16) & 0xff );
gcry_md_putc( digest, (a >> 8) & 0xff );
gcry_md_putc( digest, a & 0xff );
}
else {
byte buf[6];
size_t n;
gcry_md_putc( digest, sig->pubkey_algo );
gcry_md_putc( digest, sig->digest_algo );
if( sig->hashed_data ) {
n = (sig->hashed_data[0] << 8) | sig->hashed_data[1];
gcry_md_write( digest, sig->hashed_data, n+2 );
n += 6;
}
else
n = 6;
/* add some magic */
buf[0] = sig->version;
buf[1] = 0xff;
buf[2] = n >> 24;
buf[3] = n >> 16;
buf[4] = n >> 8;
buf[5] = n;
gcry_md_write( digest, buf, 6 );
}
gcry_md_final( digest );
result = encode_md_value( pk->pubkey_algo, digest, sig->digest_algo,
mpi_get_nbits(pk->pkey[0]));
ctx.sig = sig;
ctx.md = digest;
rc = pk_verify( pk->pubkey_algo, result, sig->data, pk->pkey,
cmp_help, &ctx );
mpi_release( result );
if( !rc && sig->flags.unknown_critical ) {
log_info(_("assuming bad signature due to an unknown critical bit\n"));
rc = G10ERR_BAD_SIGN;
}
sig->flags.checked = 1;
sig->flags.valid = !rc;
return rc;
}
static void
hash_uid_node( KBNODE unode, GCRY_MD_HD md, PKT_signature *sig )
{
PKT_user_id *uid = unode->pkt->pkt.user_id;
assert( unode->pkt->pkttype == PKT_USER_ID );
if( sig->version >=4 ) {
byte buf[5];
buf[0] = 0xb4; /* indicates a userid packet */
buf[1] = uid->len >> 24; /* always use 4 length bytes */
buf[2] = uid->len >> 16;
buf[3] = uid->len >> 8;
buf[4] = uid->len;
gcry_md_write( md, buf, 5 );
}
gcry_md_write( md, uid->name, uid->len );
}
/****************
* check the signature pointed to by NODE. This is a key signature.
* If the function detects a self-signature, it uses the PK from
* ROOT and does not read any public key.
*/
int
check_key_signature( KBNODE root, KBNODE node, int *is_selfsig )
{
u32 dummy;
return check_key_signature2(root, node, is_selfsig, &dummy );
}
int
check_key_signature2( KBNODE root, KBNODE node, int *is_selfsig, u32 *r_expire)
{
GCRY_MD_HD md;
PKT_public_key *pk;
PKT_signature *sig;
int algo;
int rc;
if( is_selfsig )
*is_selfsig = 0;
*r_expire = 0;
assert( node->pkt->pkttype == PKT_SIGNATURE );
assert( root->pkt->pkttype == PKT_PUBLIC_KEY );
pk = root->pkt->pkt.public_key;
sig = node->pkt->pkt.signature;
algo = sig->digest_algo;
#if 0 /* I am not sure whether this is a good thing to do */
if( sig->flags.checked )
log_debug("check_key_signature: already checked: %s\n",
sig->flags.valid? "good":"bad" );
#endif
if( (rc=openpgp_md_test_algo(algo)) )
return rc;
if( sig->sig_class == 0x20 ) {
if( !(md = gcry_md_open( algo, 0 )) )
BUG();
hash_public_key( md, pk );
rc = do_check( pk, sig, md );
gcry_md_close(md);
}
else if( sig->sig_class == 0x28 ) { /* subkey revocation */
KBNODE snode = find_prev_kbnode( root, node, PKT_PUBLIC_SUBKEY );
if( snode ) {
if( !(md = gcry_md_open( algo, 0 )) )
BUG();
hash_public_key( md, pk );
hash_public_key( md, snode->pkt->pkt.public_key );
rc = do_check( pk, sig, md );
gcry_md_close(md);
}
else {
log_error("no subkey for subkey revocation packet\n");
rc = G10ERR_SIG_CLASS;
}
}
else if( sig->sig_class == 0x18 ) {
KBNODE snode = find_prev_kbnode( root, node, PKT_PUBLIC_SUBKEY );
if( snode ) {
if( is_selfsig ) { /* does this make sense????? */
u32 keyid[2]; /* it should always be a selfsig */
keyid_from_pk( pk, keyid );
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] )
*is_selfsig = 1;
}
if( !(md = gcry_md_open( algo, 0 )) )
BUG();
hash_public_key( md, pk );
hash_public_key( md, snode->pkt->pkt.public_key );
rc = do_check( pk, sig, md );
gcry_md_close(md);
}
else {
log_error("no subkey for key signature packet\n");
rc = G10ERR_SIG_CLASS;
}
}
else {
KBNODE unode = find_prev_kbnode( root, node, PKT_USER_ID );
if( unode ) {
u32 keyid[2];
keyid_from_pk( pk, keyid );
if( !(md = gcry_md_open( algo, 0 )) )
BUG();
hash_public_key( md, pk );
hash_uid_node( unode, md, sig );
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] ) {
if( is_selfsig )
*is_selfsig = 1;
rc = do_check( pk, sig, md );
}
else
rc = do_signature_check( sig, md, r_expire );
gcry_md_close(md);
}
else {
log_error("no user ID for key signature packet\n");
rc = G10ERR_SIG_CLASS;
}
}
return rc;
}
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