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* sig-check.c (do_check): Code to try both the incorrect and correct
SHA-224 DER prefixes when verifying a signature. See the change itself for more discussion. * main.h, seskey.c (do_encode_md): Rename to pkcs1_encode_md and make non-static.
This commit is contained in:
David Shaw
parent
154407fd38
commit
a92fa61c48
@ -1,5 +1,12 @@
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2007-11-28 David Shaw <dshaw@jabberwocky.com>
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* sig-check.c (do_check): Code to try both the incorrect and
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correct SHA-224 DER prefixes when verifying a signature. See the
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change itself for more discussion.
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* main.h, seskey.c (do_encode_md): Rename to pkcs1_encode_md and
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make non-static.
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* gpg.c (print_algo_names): New.
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(list_config): Use it here for the "ciphername" and "digestname"
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config items so we can get a script-parseable list of the names.
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@ -13210,8 +13217,8 @@ Thu Feb 12 22:24:42 1998 Werner Koch (wk@frodo)
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* pubkey-enc.c (get_session_key): rewritten
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Copyright 1998, 1999, 2000, 2001, 2002, 2003,
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2004, 2005, 2006 Free Software Foundation, Inc.
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Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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2007 Free Software Foundation, Inc.
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This file is free software; as a special exception the author gives
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unlimited permission to copy and/or distribute it, with or without
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@ -1,6 +1,6 @@
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/* main.h
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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* 2006 Free Software Foundation, Inc.
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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* 2007 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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@ -200,6 +200,8 @@ void try_make_homedir( const char *fname );
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/*-- seskey.c --*/
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void make_session_key( DEK *dek );
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MPI encode_session_key( DEK *dek, unsigned nbits );
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MPI pkcs1_encode_md( MD_HANDLE md, int algo, size_t len, unsigned nbits,
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const byte *asn, size_t asnlen );
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MPI encode_md_value( PKT_public_key *pk, PKT_secret_key *sk,
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MD_HANDLE md, int hash_algo );
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18
g10/seskey.c
18
g10/seskey.c
@ -1,6 +1,6 @@
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/* seskey.c - make sesssion keys etc.
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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* 2006 Free Software Foundation, Inc.
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006,
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* 2007 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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@ -29,7 +29,6 @@
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#include "main.h"
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#include "i18n.h"
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/****************
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* Make a session key and put it into DEK
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*/
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@ -142,10 +141,9 @@ encode_session_key( DEK *dek, unsigned nbits )
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return a;
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}
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static MPI
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do_encode_md( MD_HANDLE md, int algo, size_t len, unsigned nbits,
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const byte *asn, size_t asnlen )
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MPI
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pkcs1_encode_md( MD_HANDLE md, int algo, size_t len, unsigned nbits,
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const byte *asn, size_t asnlen )
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{
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int nframe = (nbits+7) / 8;
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byte *frame;
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@ -260,9 +258,9 @@ encode_md_value( PKT_public_key *pk, PKT_secret_key *sk,
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size_t asnlen,mdlen;
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asn = md_asn_oid( hash_algo, &asnlen, &mdlen );
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frame = do_encode_md( md, hash_algo, mdlen,
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mpi_get_nbits(pk?pk->pkey[0]:sk->skey[0]),
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asn, asnlen );
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frame = pkcs1_encode_md( md, hash_algo, mdlen,
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mpi_get_nbits(pk?pk->pkey[0]:sk->skey[0]),
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asn, asnlen );
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}
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return frame;
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@ -1,6 +1,6 @@
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/* sig-check.c - Check a signature
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
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* 2004 Free Software Foundation, Inc.
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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* 2007 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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@ -280,6 +280,32 @@ do_check( PKT_public_key *pk, PKT_signature *sig, MD_HANDLE digest,
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rc = pubkey_verify( pk->pubkey_algo, result, sig->data, pk->pkey );
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mpi_free( result );
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if(rc==G10ERR_BAD_SIGN && is_RSA(pk->pubkey_algo)
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&& sig->digest_algo==DIGEST_ALGO_SHA224)
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{
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/* This code is to work around a SHA-224 problem. RFC-4880
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and the drafts leading up to it were published with the
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wrong DER prefix for SHA-224. Unfortunately, GPG pre-1.4.8
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used this wrong prefix. What this code does is take all
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bad RSA signatures that use SHA-224, and re-checks them
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using the old, incorrect, DER prefix. Someday we should
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remove this code, and when we do remove it, pkcs1_encode_md
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can be made into a static function again. Note that GPG2
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does not have this issue as it uses libgcrypt, which is
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being fixed while it is still a development version. */
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/* The incorrect SHA-224 DER prefix used in pre-1.4.8 */
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static byte asn[]={0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
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0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05,
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0x00, 0x04, 0x20};
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result=pkcs1_encode_md(digest,DIGEST_ALGO_SHA224,28,
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mpi_get_nbits(pk->pkey[0]),asn,DIM(asn));
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rc=pubkey_verify(pk->pubkey_algo,result,sig->data,pk->pkey);
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mpi_free(result);
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}
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if( !rc && sig->flags.unknown_critical )
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{
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log_info(_("assuming bad signature from key %s"
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