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gnupg/g10/mainproc.c
Werner Koch e6175055fb gpg: Limit the nesting level of I/O filters. 
* common/iobuf.c (MAX_NESTING_FILTER): New.
(iobuf_push_filter2): Limit the nesting level.

* g10/mainproc.c (mainproc_context): New field ANY.  Change HAVE_DATA
and ANY_SIG_SIGN to bit fields of ANY.  Add bit field
UNCOMPRESS_FAILED.
(proc_compressed): Avoid printing multiple Bad Data messages.
(check_nesting): Return GPG_ERR_BAD_DATA instead of UNEXPECTED_DATA.
--

This is a more general fix for the nested compression packet bug.  In
particular this helps g10/import.c:read_block to stop pushing
compression filters onto an iobuf stream.  This patch also reduces the
number of error messages for the non-import case.

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 35e40e2d514223c950c2f6d1214e02e92d87e997)

Resolved conflicts:
	common/iobuf.c
	g10/mainproc.c
2013-10-04 14:05:59 +02:00

2254 lines
64 KiB
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/* mainproc.c - handle packets
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
* 2008, 2009 Free Software Foundation, Inc.
* Copyright (C) 2013 Werner Koch
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include "gpg.h"
#include "util.h"
#include "packet.h"
#include "iobuf.h"
#include "options.h"
#include "cipher.h"
#include "keydb.h"
#include "filter.h"
#include "main.h"
#include "status.h"
#include "i18n.h"
#include "trustdb.h"
#include "keyserver-internal.h"
#include "photoid.h"
#include "pka.h"
/* Put an upper limit on nested packets. The 32 is an arbitrary
value, a much lower should actually be sufficient. */
#define MAX_NESTING_DEPTH 32
struct kidlist_item {
struct kidlist_item *next;
u32 kid[2];
int pubkey_algo;
int reason;
};
/****************
* Structure to hold the context
*/
typedef struct mainproc_context *CTX;
struct mainproc_context
{
ctrl_t ctrl;
struct mainproc_context *anchor; /* May be useful in the future. */
PKT_public_key *last_pubkey;
PKT_user_id *last_user_id;
md_filter_context_t mfx;
int sigs_only; /* Process only signatures and reject all other stuff. */
int encrypt_only; /* Process only encryption messages. */
/* Name of the file with the complete signature or the file with the
detached signature. This is currently only used to deduce the
file name of the data file if that has not been given. */
const char *sigfilename;
/* A structure to describe the signed data in case of a detached
signature. */
struct
{
/* A file descriptor of the the signed data. Only used if not -1. */
int data_fd;
/* A list of filenames with the data files or NULL. This is only
used if DATA_FD is -1. */
strlist_t data_names;
/* Flag to indicated that either one of the next previous fields
is used. This is only needed for better readability. */
int used;
} signed_data;
DEK *dek;
int last_was_session_key;
KBNODE list; /* The current list of packets. */
IOBUF iobuf; /* Used to get the filename etc. */
int trustletter; /* Temporary usage in list_node. */
ulong symkeys;
struct kidlist_item *pkenc_list; /* List of encryption packets. */
struct {
unsigned int sig_seen:1; /* Set to true if a signature packet
has been seen. */
unsigned int data:1; /* Any data packet seen */
unsigned int uncompress_failed:1;
} any;
};
static int do_proc_packets( CTX c, IOBUF a );
static void list_node( CTX c, KBNODE node );
static void proc_tree( CTX c, KBNODE node );
static int literals_seen;
void
reset_literals_seen(void)
{
literals_seen=0;
}
static void
release_list( CTX c )
{
if( !c->list )
return;
proc_tree(c, c->list );
release_kbnode( c->list );
while( c->pkenc_list ) {
struct kidlist_item *tmp = c->pkenc_list->next;
xfree( c->pkenc_list );
c->pkenc_list = tmp;
}
c->pkenc_list = NULL;
c->list = NULL;
c->any.data = 0;
c->any.uncompress_failed = 0;
c->last_was_session_key = 0;
xfree(c->dek); c->dek = NULL;
}
static int
add_onepass_sig( CTX c, PACKET *pkt )
{
KBNODE node;
if ( c->list ) /* add another packet */
add_kbnode( c->list, new_kbnode( pkt ));
else /* insert the first one */
c->list = node = new_kbnode( pkt );
return 1;
}
static int
add_gpg_control( CTX c, PACKET *pkt )
{
if ( pkt->pkt.gpg_control->control == CTRLPKT_CLEARSIGN_START ) {
/* New clear text signature.
* Process the last one and reset everything */
release_list(c);
}
if( c->list ) /* add another packet */
add_kbnode( c->list, new_kbnode( pkt ));
else /* insert the first one */
c->list = new_kbnode( pkt );
return 1;
}
static int
add_user_id( CTX c, PACKET *pkt )
{
if( !c->list ) {
log_error("orphaned user ID\n" );
return 0;
}
add_kbnode( c->list, new_kbnode( pkt ) );
return 1;
}
static int
add_subkey( CTX c, PACKET *pkt )
{
if( !c->list ) {
log_error("subkey w/o mainkey\n" );
return 0;
}
add_kbnode( c->list, new_kbnode( pkt ) );
return 1;
}
static int
add_ring_trust( CTX c, PACKET *pkt )
{
if( !c->list ) {
log_error("ring trust w/o key\n" );
return 0;
}
add_kbnode( c->list, new_kbnode( pkt ) );
return 1;
}
static int
add_signature( CTX c, PACKET *pkt )
{
KBNODE node;
c->any.sig_seen = 1;
if( pkt->pkttype == PKT_SIGNATURE && !c->list ) {
/* This is the first signature for the following datafile.
* GPG does not write such packets; instead it always uses
* onepass-sig packets. The drawback of PGP's method
* of prepending the signature to the data is
* that it is not possible to make a signature from data read
* from stdin. (GPG is able to read PGP stuff anyway.) */
node = new_kbnode( pkt );
c->list = node;
return 1;
}
else if( !c->list )
return 0; /* oops (invalid packet sequence)*/
else if( !c->list->pkt )
BUG(); /* so nicht */
/* add a new signature node id at the end */
node = new_kbnode( pkt );
add_kbnode( c->list, node );
return 1;
}
static int
symkey_decrypt_seskey( DEK *dek, byte *seskey, size_t slen )
{
gcry_cipher_hd_t hd;
if(slen < 17 || slen > 33)
{
log_error ( _("weird size for an encrypted session key (%d)\n"),
(int)slen);
return G10ERR_BAD_KEY;
}
if (openpgp_cipher_open (&hd, dek->algo, GCRY_CIPHER_MODE_CFB, 1))
BUG ();
if (gcry_cipher_setkey ( hd, dek->key, dek->keylen ))
BUG ();
gcry_cipher_setiv ( hd, NULL, 0 );
gcry_cipher_decrypt ( hd, seskey, slen, NULL, 0 );
gcry_cipher_close ( hd );
/* Now we replace the dek components with the real session key to
decrypt the contents of the sequencing packet. */
dek->keylen=slen-1;
dek->algo=seskey[0];
if(dek->keylen > DIM(dek->key))
BUG ();
memcpy(dek->key, seskey + 1, dek->keylen);
/*log_hexdump( "thekey", dek->key, dek->keylen );*/
return 0;
}
static void
proc_symkey_enc( CTX c, PACKET *pkt )
{
PKT_symkey_enc *enc;
enc = pkt->pkt.symkey_enc;
if (!enc)
log_error ("invalid symkey encrypted packet\n");
else if(!c->dek)
{
int algo = enc->cipher_algo;
const char *s = openpgp_cipher_algo_name (algo);
if (!openpgp_cipher_test_algo (algo))
{
if(!opt.quiet)
{
if(enc->seskeylen)
log_info(_("%s encrypted session key\n"), s );
else
log_info(_("%s encrypted data\n"), s );
}
}
else
log_error(_("encrypted with unknown algorithm %d\n"), algo );
if(openpgp_md_test_algo (enc->s2k.hash_algo))
{
log_error(_("passphrase generated with unknown digest"
" algorithm %d\n"),enc->s2k.hash_algo);
s=NULL;
}
c->last_was_session_key = 2;
if(!s || opt.list_only)
goto leave;
if(opt.override_session_key)
{
c->dek = xmalloc_clear( sizeof *c->dek );
if(get_override_session_key(c->dek, opt.override_session_key))
{
xfree(c->dek);
c->dek = NULL;
}
}
else
{
c->dek = passphrase_to_dek (NULL, 0, algo, &enc->s2k, 3,
NULL, NULL);
if(c->dek)
{
c->dek->symmetric=1;
/* FIXME: This doesn't work perfectly if a symmetric
key comes before a public key in the message - if
the user doesn't know the passphrase, then there is
a chance that the "decrypted" algorithm will happen
to be a valid one, which will make the returned dek
appear valid, so we won't try any public keys that
come later. */
if(enc->seskeylen)
{
if(symkey_decrypt_seskey(c->dek, enc->seskey,
enc->seskeylen))
{
xfree(c->dek);
c->dek=NULL;
}
}
else
c->dek->algo_info_printed = 1;
}
}
}
leave:
c->symkeys++;
free_packet(pkt);
}
static void
proc_pubkey_enc( CTX c, PACKET *pkt )
{
PKT_pubkey_enc *enc;
int result = 0;
/* check whether the secret key is available and store in this case */
c->last_was_session_key = 1;
enc = pkt->pkt.pubkey_enc;
/*printf("enc: encrypted by a pubkey with keyid %08lX\n", enc->keyid[1] );*/
/* Hmmm: why do I have this algo check here - anyway there is
* function to check it. */
if( opt.verbose )
log_info(_("public key is %s\n"), keystr(enc->keyid) );
if( is_status_enabled() ) {
char buf[50];
/* FIXME: For ECC support we need to map the OpenPGP algo
number to the Libgcrypt definef one. This is due a
chicken-egg problem: We need to have code in libgcrypt for
a new algorithm so to implement a proposed new algorithm
before the IANA will finally assign an OpenPGP
indentifier. */
snprintf (buf, sizeof buf, "%08lX%08lX %d 0",
(ulong)enc->keyid[0], (ulong)enc->keyid[1], enc->pubkey_algo );
write_status_text( STATUS_ENC_TO, buf );
}
if( !opt.list_only && opt.override_session_key ) {
/* It does not make much sense to store the session key in
* secure memory because it has already been passed on the
* command line and the GCHQ knows about it. */
c->dek = xmalloc_clear( sizeof *c->dek );
result = get_override_session_key ( c->dek, opt.override_session_key );
if ( result ) {
xfree(c->dek); c->dek = NULL;
}
}
else if( is_ELGAMAL(enc->pubkey_algo)
|| enc->pubkey_algo == PUBKEY_ALGO_DSA
|| enc->pubkey_algo == PUBKEY_ALGO_ECDSA
|| enc->pubkey_algo == PUBKEY_ALGO_ECDH
|| is_RSA(enc->pubkey_algo)
|| enc->pubkey_algo == PUBKEY_ALGO_ELGAMAL) {
/* Note that we also allow type 20 Elgamal keys for decryption.
There are still a couple of those keys in active use as a
subkey. */
/* FIXME: Store this all in a list and process it later so that
we can prioritize what key to use. This gives a better user
experience if wildcard keyids are used. */
if ( !c->dek && ((!enc->keyid[0] && !enc->keyid[1])
|| opt.try_all_secrets
|| have_secret_key_with_kid (enc->keyid)) ) {
if( opt.list_only )
result = -1;
else {
c->dek = xmalloc_secure_clear( sizeof *c->dek );
if( (result = get_session_key( enc, c->dek )) ) {
/* error: delete the DEK */
xfree(c->dek); c->dek = NULL;
}
}
}
else
result = G10ERR_NO_SECKEY;
}
else
result = G10ERR_PUBKEY_ALGO;
if( result == -1 )
;
else
{
/* store it for later display */
struct kidlist_item *x = xmalloc( sizeof *x );
x->kid[0] = enc->keyid[0];
x->kid[1] = enc->keyid[1];
x->pubkey_algo = enc->pubkey_algo;
x->reason = result;
x->next = c->pkenc_list;
c->pkenc_list = x;
if( !result && opt.verbose > 1 )
log_info( _("public key encrypted data: good DEK\n") );
}
free_packet(pkt);
}
/****************
* Print the list of public key encrypted packets which we could
* not decrypt.
*/
static void
print_pkenc_list( struct kidlist_item *list, int failed )
{
for( ; list; list = list->next ) {
PKT_public_key *pk;
const char *algstr;
if ( failed && !list->reason )
continue;
if ( !failed && list->reason )
continue;
algstr = openpgp_pk_algo_name ( list->pubkey_algo );
pk = xmalloc_clear( sizeof *pk );
if( !algstr )
algstr = "[?]";
pk->pubkey_algo = list->pubkey_algo;
if( !get_pubkey( pk, list->kid ) )
{
char *p;
log_info( _("encrypted with %u-bit %s key, ID %s, created %s\n"),
nbits_from_pk( pk ), algstr, keystr_from_pk(pk),
strtimestamp(pk->timestamp) );
p=get_user_id_native(list->kid);
log_printf (_(" \"%s\"\n"),p);
xfree(p);
}
else
log_info(_("encrypted with %s key, ID %s\n"),
algstr,keystr(list->kid));
free_public_key( pk );
if( list->reason == G10ERR_NO_SECKEY ) {
if( is_status_enabled() ) {
char buf[20];
snprintf (buf, sizeof buf, "%08lX%08lX",
(ulong)list->kid[0], (ulong)list->kid[1]);
write_status_text( STATUS_NO_SECKEY, buf );
}
}
else if (list->reason)
{
log_info(_("public key decryption failed: %s\n"),
g10_errstr(list->reason));
write_status_error ("pkdecrypt_failed", list->reason);
}
}
}
static void
proc_encrypted( CTX c, PACKET *pkt )
{
int result = 0;
if (!opt.quiet)
{
if(c->symkeys>1)
log_info(_("encrypted with %lu passphrases\n"),c->symkeys);
else if(c->symkeys==1)
log_info(_("encrypted with 1 passphrase\n"));
print_pkenc_list ( c->pkenc_list, 1 );
print_pkenc_list ( c->pkenc_list, 0 );
}
/* FIXME: Figure out the session key by looking at all pkenc packets. */
write_status( STATUS_BEGIN_DECRYPTION );
/*log_debug("dat: %sencrypted data\n", c->dek?"":"conventional ");*/
if( opt.list_only )
result = -1;
else if( !c->dek && !c->last_was_session_key ) {
int algo;
STRING2KEY s2kbuf, *s2k = NULL;
if(opt.override_session_key)
{
c->dek = xmalloc_clear( sizeof *c->dek );
result=get_override_session_key(c->dek, opt.override_session_key);
if(result)
{
xfree(c->dek);
c->dek = NULL;
}
}
else
{
/* Assume this is old style conventional encrypted data. */
algo = opt.def_cipher_algo;
if ( algo )
log_info (_("assuming %s encrypted data\n"),
openpgp_cipher_algo_name (algo));
else if ( openpgp_cipher_test_algo (CIPHER_ALGO_IDEA) )
{
algo = opt.def_cipher_algo;
if (!algo)
algo = opt.s2k_cipher_algo;
log_info (_("IDEA cipher unavailable, "
"optimistically attempting to use %s instead\n"),
openpgp_cipher_algo_name (algo));
}
else
{
algo = CIPHER_ALGO_IDEA;
if (!opt.s2k_digest_algo)
{
/* If no digest is given we assume MD5 */
s2kbuf.mode = 0;
s2kbuf.hash_algo = DIGEST_ALGO_MD5;
s2k = &s2kbuf;
}
log_info (_("assuming %s encrypted data\n"), "IDEA");
}
c->dek = passphrase_to_dek ( NULL, 0, algo, s2k, 3, NULL, NULL );
if (c->dek)
c->dek->algo_info_printed = 1;
}
}
else if( !c->dek )
result = G10ERR_NO_SECKEY;
if (!result)
result = decrypt_data (c->ctrl, c, pkt->pkt.encrypted, c->dek );
if( result == -1 )
;
else if( !result || (gpg_err_code (result) == GPG_ERR_BAD_SIGNATURE
&& opt.ignore_mdc_error)) {
write_status( STATUS_DECRYPTION_OKAY );
if( opt.verbose > 1 )
log_info(_("decryption okay\n"));
if( pkt->pkt.encrypted->mdc_method && !result )
write_status( STATUS_GOODMDC );
else if(!opt.no_mdc_warn)
log_info (_("WARNING: message was not integrity protected\n"));
if(opt.show_session_key)
{
int i;
char *buf = xmalloc ( c->dek->keylen*2 + 20 );
sprintf ( buf, "%d:", c->dek->algo );
for(i=0; i < c->dek->keylen; i++ )
sprintf(buf+strlen(buf), "%02X", c->dek->key[i] );
log_info( "session key: '%s'\n", buf );
write_status_text ( STATUS_SESSION_KEY, buf );
}
}
else if( result == G10ERR_BAD_SIGN ) {
glo_ctrl.lasterr = result;
log_error(_("WARNING: encrypted message has been manipulated!\n"));
write_status( STATUS_BADMDC );
write_status( STATUS_DECRYPTION_FAILED );
}
else {
if (gpg_err_code (result) == GPG_ERR_BAD_KEY
&& *c->dek->s2k_cacheid != '\0')
{
log_debug(_("cleared passphrase cached with ID: %s\n"),
c->dek->s2k_cacheid);
passphrase_clear_cache (NULL, c->dek->s2k_cacheid, 0);
}
glo_ctrl.lasterr = result;
write_status( STATUS_DECRYPTION_FAILED );
log_error(_("decryption failed: %s\n"), g10_errstr(result));
/* Hmmm: does this work when we have encrypted using multiple
* ways to specify the session key (symmmetric and PK)*/
}
xfree(c->dek); c->dek = NULL;
free_packet(pkt);
c->last_was_session_key = 0;
write_status( STATUS_END_DECRYPTION );
}
static void
proc_plaintext( CTX c, PACKET *pkt )
{
PKT_plaintext *pt = pkt->pkt.plaintext;
int any, clearsig, only_md5, rc;
KBNODE n;
literals_seen++;
if( pt->namelen == 8 && !memcmp( pt->name, "_CONSOLE", 8 ) )
log_info(_("NOTE: sender requested \"for-your-eyes-only\"\n"));
else if( opt.verbose )
log_info(_("original file name='%.*s'\n"), pt->namelen, pt->name);
free_md_filter_context( &c->mfx );
if (gcry_md_open (&c->mfx.md, 0, 0))
BUG ();
/* fixme: we may need to push the textfilter if we have sigclass 1
* and no armoring - Not yet tested
* Hmmm, why don't we need it at all if we have sigclass 1
* Should we assume that plaintext in mode 't' has always sigclass 1??
* See: Russ Allbery's mail 1999-02-09
*/
any = clearsig = only_md5 = 0;
for(n=c->list; n; n = n->next )
{
if( n->pkt->pkttype == PKT_ONEPASS_SIG )
{
/* For the onepass signature case */
if( n->pkt->pkt.onepass_sig->digest_algo )
{
gcry_md_enable (c->mfx.md,
n->pkt->pkt.onepass_sig->digest_algo);
if( !any && n->pkt->pkt.onepass_sig->digest_algo
== DIGEST_ALGO_MD5 )
only_md5 = 1;
else
only_md5 = 0;
any = 1;
}
if( n->pkt->pkt.onepass_sig->sig_class != 0x01 )
only_md5 = 0;
}
else if( n->pkt->pkttype == PKT_GPG_CONTROL
&& n->pkt->pkt.gpg_control->control
== CTRLPKT_CLEARSIGN_START )
{
/* For the clearsigned message case */
size_t datalen = n->pkt->pkt.gpg_control->datalen;
const byte *data = n->pkt->pkt.gpg_control->data;
/* check that we have at least the sigclass and one hash */
if ( datalen < 2 )
log_fatal("invalid control packet CTRLPKT_CLEARSIGN_START\n");
/* Note that we don't set the clearsig flag for not-dash-escaped
* documents */
clearsig = (*data == 0x01);
for( data++, datalen--; datalen; datalen--, data++ )
gcry_md_enable (c->mfx.md, *data);
any = 1;
break; /* Stop here as one-pass signature packets are not
expected. */
}
else if(n->pkt->pkttype==PKT_SIGNATURE)
{
/* For the SIG+LITERAL case that PGP used to use. */
gcry_md_enable ( c->mfx.md, n->pkt->pkt.signature->digest_algo );
any=1;
}
}
if( !any && !opt.skip_verify )
{
/* This is for the old GPG LITERAL+SIG case. It's not legal
according to 2440, so hopefully it won't come up that
often. There is no good way to specify what algorithms to
use in that case, so these three are the historical
answer. */
gcry_md_enable( c->mfx.md, DIGEST_ALGO_RMD160 );
gcry_md_enable( c->mfx.md, DIGEST_ALGO_SHA1 );
gcry_md_enable( c->mfx.md, DIGEST_ALGO_MD5 );
}
if( opt.pgp2_workarounds && only_md5 && !opt.skip_verify ) {
/* This is a kludge to work around a bug in pgp2. It does only
* catch those mails which are armored. To catch the non-armored
* pgp mails we could see whether there is the signature packet
* in front of the plaintext. If someone needs this, send me a patch.
*/
if ( gcry_md_open (&c->mfx.md2, DIGEST_ALGO_MD5, 0) )
BUG ();
}
if ( DBG_HASHING ) {
gcry_md_debug ( c->mfx.md, "verify" );
if ( c->mfx.md2 )
gcry_md_debug ( c->mfx.md2, "verify2" );
}
rc=0;
if (literals_seen>1)
{
log_info (_("WARNING: multiple plaintexts seen\n"));
if (!opt.flags.allow_multiple_messages)
{
write_status_text (STATUS_ERROR, "proc_pkt.plaintext 89_BAD_DATA");
log_inc_errorcount ();
rc = gpg_error (GPG_ERR_UNEXPECTED);
}
}
if(!rc)
{
rc = handle_plaintext( pt, &c->mfx, c->sigs_only, clearsig );
if ( gpg_err_code (rc) == GPG_ERR_EACCES && !c->sigs_only )
{
/* Can't write output but we hash it anyway to check the
signature. */
rc = handle_plaintext( pt, &c->mfx, 1, clearsig );
}
}
if( rc )
log_error( "handle plaintext failed: %s\n", g10_errstr(rc));
free_packet(pkt);
c->last_was_session_key = 0;
/* We add a marker control packet instead of the plaintext packet.
* This is so that we can later detect invalid packet sequences.
*/
n = new_kbnode (create_gpg_control (CTRLPKT_PLAINTEXT_MARK, NULL, 0));
if (c->list)
add_kbnode (c->list, n);
else
c->list = n;
}
static int
proc_compressed_cb( IOBUF a, void *info )
{
if ( ((CTX)info)->signed_data.used
&& ((CTX)info)->signed_data.data_fd != -1)
return proc_signature_packets_by_fd (((CTX)info)->ctrl, info, a,
((CTX)info)->signed_data.data_fd);
else
return proc_signature_packets (((CTX)info)->ctrl, info, a,
((CTX)info)->signed_data.data_names,
((CTX)info)->sigfilename );
}
static int
proc_encrypt_cb (IOBUF a, void *info )
{
CTX c = info;
return proc_encryption_packets (c->ctrl, info, a );
}
static int
proc_compressed( CTX c, PACKET *pkt )
{
PKT_compressed *zd = pkt->pkt.compressed;
int rc;
/*printf("zip: compressed data packet\n");*/
if (c->sigs_only)
rc = handle_compressed (c->ctrl, c, zd, proc_compressed_cb, c);
else if( c->encrypt_only )
rc = handle_compressed (c->ctrl, c, zd, proc_encrypt_cb, c);
else
rc = handle_compressed (c->ctrl, c, zd, NULL, NULL);
if (gpg_err_code (rc) == GPG_ERR_BAD_DATA)
{
if (!c->any.uncompress_failed)
{
CTX cc;
for (cc=c; cc; cc = cc->anchor)
cc->any.uncompress_failed = 1;
log_error ("uncompressing failed: %s\n", gpg_strerror (rc));
}
}
else if (rc)
log_error ("uncompressing failed: %s\n", gpg_strerror (rc));
free_packet(pkt);
c->last_was_session_key = 0;
return rc;
}
/****************
* check the signature
* Returns: 0 = valid signature or an error code
*/
static int
do_check_sig( CTX c, KBNODE node, int *is_selfsig,
int *is_expkey, int *is_revkey )
{
PKT_signature *sig;
gcry_md_hd_t md = NULL, md2 = NULL;
int algo, rc;
assert( node->pkt->pkttype == PKT_SIGNATURE );
if( is_selfsig )
*is_selfsig = 0;
sig = node->pkt->pkt.signature;
algo = sig->digest_algo;
rc = openpgp_md_test_algo(algo);
if (rc)
return rc;
if( sig->sig_class == 0x00 ) {
if( c->mfx.md )
{
if (gcry_md_copy (&md, c->mfx.md ))
BUG ();
}
else /* detached signature */
{
/* signature_check() will enable the md*/
if (gcry_md_open (&md, 0, 0 ))
BUG ();
}
}
else if( sig->sig_class == 0x01 ) {
/* how do we know that we have to hash the (already hashed) text
* in canonical mode ??? (calculating both modes???) */
if( c->mfx.md ) {
if (gcry_md_copy (&md, c->mfx.md ))
BUG ();
if( c->mfx.md2 && gcry_md_copy (&md2, c->mfx.md2 ))
BUG ();
}
else { /* detached signature */
log_debug("Do we really need this here?");
/* signature_check() will enable the md*/
if (gcry_md_open (&md, 0, 0 ))
BUG ();
if (gcry_md_open (&md2, 0, 0 ))
BUG ();
}
}
else if( (sig->sig_class&~3) == 0x10
|| sig->sig_class == 0x18
|| sig->sig_class == 0x1f
|| sig->sig_class == 0x20
|| sig->sig_class == 0x28
|| sig->sig_class == 0x30 ) {
if( c->list->pkt->pkttype == PKT_PUBLIC_KEY
|| c->list->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
return check_key_signature( c->list, node, is_selfsig );
}
else if( sig->sig_class == 0x20 ) {
log_error (_("standalone revocation - "
"use \"gpg --import\" to apply\n"));
return G10ERR_NOT_PROCESSED;
}
else {
log_error("invalid root packet for sigclass %02x\n",
sig->sig_class);
return G10ERR_SIG_CLASS;
}
}
else
return G10ERR_SIG_CLASS;
rc = signature_check2( sig, md, NULL, is_expkey, is_revkey, NULL );
if( gpg_err_code (rc) == GPG_ERR_BAD_SIGNATURE && md2 )
rc = signature_check2( sig, md2, NULL, is_expkey, is_revkey, NULL );
gcry_md_close(md);
gcry_md_close(md2);
return rc;
}
static void
print_userid( PACKET *pkt )
{
if( !pkt )
BUG();
if( pkt->pkttype != PKT_USER_ID ) {
printf("ERROR: unexpected packet type %d", pkt->pkttype );
return;
}
if( opt.with_colons )
{
if(pkt->pkt.user_id->attrib_data)
printf("%u %lu",
pkt->pkt.user_id->numattribs,
pkt->pkt.user_id->attrib_len);
else
es_write_sanitized (es_stdout, pkt->pkt.user_id->name,
pkt->pkt.user_id->len, ":", NULL);
}
else
print_utf8_buffer (es_stdout, pkt->pkt.user_id->name,
pkt->pkt.user_id->len );
}
/****************
* List the certificate in a user friendly way
*/
static void
list_node( CTX c, KBNODE node )
{
int any=0;
int mainkey;
if( !node )
;
else if( (mainkey = (node->pkt->pkttype == PKT_PUBLIC_KEY) )
|| node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
PKT_public_key *pk = node->pkt->pkt.public_key;
if( opt.with_colons )
{
u32 keyid[2];
keyid_from_pk( pk, keyid );
if( mainkey )
c->trustletter = opt.fast_list_mode?
0 : get_validity_info( pk, NULL );
printf("%s:", mainkey? "pub":"sub" );
if( c->trustletter )
putchar( c->trustletter );
printf(":%u:%d:%08lX%08lX:%s:%s::",
nbits_from_pk( pk ),
pk->pubkey_algo,
(ulong)keyid[0],(ulong)keyid[1],
colon_datestr_from_pk( pk ),
colon_strtime (pk->expiredate) );
if( mainkey && !opt.fast_list_mode )
putchar( get_ownertrust_info (pk) );
putchar(':');
if( node->next && node->next->pkt->pkttype == PKT_RING_TRUST) {
putchar('\n'); any=1;
if( opt.fingerprint )
print_fingerprint (pk, 0);
printf("rtv:1:%u:\n",
node->next->pkt->pkt.ring_trust->trustval );
}
}
else
printf("%s %4u%c/%s %s%s",
mainkey? "pub":"sub", nbits_from_pk( pk ),
pubkey_letter( pk->pubkey_algo ), keystr_from_pk( pk ),
datestr_from_pk( pk ), mainkey?" ":"");
if( mainkey ) {
/* and now list all userids with their signatures */
for( node = node->next; node; node = node->next ) {
if( node->pkt->pkttype == PKT_SIGNATURE ) {
if( !any ) {
if( node->pkt->pkt.signature->sig_class == 0x20 )
puts("[revoked]");
else
putchar('\n');
any = 1;
}
list_node(c, node );
}
else if( node->pkt->pkttype == PKT_USER_ID ) {
if( any ) {
if( opt.with_colons )
printf("%s:::::::::",
node->pkt->pkt.user_id->attrib_data?"uat":"uid");
else
printf( "uid%*s", 28, "" );
}
print_userid( node->pkt );
if( opt.with_colons )
putchar(':');
putchar('\n');
if( opt.fingerprint && !any )
print_fingerprint ( pk, 0 );
if( opt.with_colons
&& node->next
&& node->next->pkt->pkttype == PKT_RING_TRUST ) {
printf("rtv:2:%u:\n",
node->next->pkt->pkt.ring_trust?
node->next->pkt->pkt.ring_trust->trustval : 0);
}
any=1;
}
else if( node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
if( !any ) {
putchar('\n');
any = 1;
}
list_node(c, node );
}
}
}
else
{
/* of subkey */
if( pk->flags.revoked )
{
printf(" [");
printf(_("revoked: %s"),revokestr_from_pk(pk));
printf("]");
}
else if( pk->expiredate )
{
printf(" [");
printf(_("expires: %s"),expirestr_from_pk(pk));
printf("]");
}
}
if( !any )
putchar('\n');
if( !mainkey && opt.fingerprint > 1 )
print_fingerprint( pk, 0 );
}
else if( (mainkey = (node->pkt->pkttype == PKT_SECRET_KEY) )
|| node->pkt->pkttype == PKT_SECRET_SUBKEY ) {
log_debug ("FIXME: No way to print secret key packets here\n");
/* fixme: We may use a fucntion to trun a secret key packet into
a public key one and use that here. */
/* PKT_secret_key *sk = node->pkt->pkt.secret_key; */
/* if( opt.with_colons ) */
/* { */
/* u32 keyid[2]; */
/* keyid_from_sk( sk, keyid ); */
/* printf("%s::%u:%d:%08lX%08lX:%s:%s:::", */
/* mainkey? "sec":"ssb", */
/* nbits_from_sk( sk ), */
/* sk->pubkey_algo, */
/* (ulong)keyid[0],(ulong)keyid[1], */
/* colon_datestr_from_sk( sk ), */
/* colon_strtime (sk->expiredate) */
/* /\* fixme: add LID *\/ ); */
/* } */
/* else */
/* printf("%s %4u%c/%s %s ", mainkey? "sec":"ssb", */
/* nbits_from_sk( sk ), pubkey_letter( sk->pubkey_algo ), */
/* keystr_from_sk( sk ), datestr_from_sk( sk )); */
/* if( mainkey ) { */
/* /\* and now list all userids with their signatures *\/ */
/* for( node = node->next; node; node = node->next ) { */
/* if( node->pkt->pkttype == PKT_SIGNATURE ) { */
/* if( !any ) { */
/* if( node->pkt->pkt.signature->sig_class == 0x20 ) */
/* puts("[revoked]"); */
/* else */
/* putchar('\n'); */
/* any = 1; */
/* } */
/* list_node(c, node ); */
/* } */
/* else if( node->pkt->pkttype == PKT_USER_ID ) { */
/* if( any ) { */
/* if( opt.with_colons ) */
/* printf("%s:::::::::", */
/* node->pkt->pkt.user_id->attrib_data?"uat":"uid"); */
/* else */
/* printf( "uid%*s", 28, "" ); */
/* } */
/* print_userid( node->pkt ); */
/* if( opt.with_colons ) */
/* putchar(':'); */
/* putchar('\n'); */
/* if( opt.fingerprint && !any ) */
/* print_fingerprint( NULL, sk, 0 ); */
/* any=1; */
/* } */
/* else if( node->pkt->pkttype == PKT_SECRET_SUBKEY ) { */
/* if( !any ) { */
/* putchar('\n'); */
/* any = 1; */
/* } */
/* list_node(c, node ); */
/* } */
/* } */
/* } */
/* if( !any ) */
/* putchar('\n'); */
/* if( !mainkey && opt.fingerprint > 1 ) */
/* print_fingerprint( NULL, sk, 0 ); */
}
else if( node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *sig = node->pkt->pkt.signature;
int is_selfsig = 0;
int rc2=0;
size_t n;
char *p;
int sigrc = ' ';
if( !opt.verbose )
return;
if( sig->sig_class == 0x20 || sig->sig_class == 0x30 )
fputs("rev", stdout);
else
fputs("sig", stdout);
if( opt.check_sigs ) {
fflush(stdout);
rc2=do_check_sig( c, node, &is_selfsig, NULL, NULL );
switch (gpg_err_code (rc2)) {
case 0: sigrc = '!'; break;
case GPG_ERR_BAD_SIGNATURE: sigrc = '-'; break;
case GPG_ERR_NO_PUBKEY:
case GPG_ERR_UNUSABLE_PUBKEY: sigrc = '?'; break;
default: sigrc = '%'; break;
}
}
else { /* check whether this is a self signature */
u32 keyid[2];
if( c->list->pkt->pkttype == PKT_PUBLIC_KEY
|| c->list->pkt->pkttype == PKT_SECRET_KEY )
{
keyid_from_pk (c->list->pkt->pkt.public_key, keyid);
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] )
is_selfsig = 1;
}
}
if( opt.with_colons ) {
putchar(':');
if( sigrc != ' ' )
putchar(sigrc);
printf("::%d:%08lX%08lX:%s:%s:", sig->pubkey_algo,
(ulong)sig->keyid[0], (ulong)sig->keyid[1],
colon_datestr_from_sig(sig),
colon_expirestr_from_sig(sig));
if(sig->trust_depth || sig->trust_value)
printf("%d %d",sig->trust_depth,sig->trust_value);
printf(":");
if(sig->trust_regexp)
es_write_sanitized (es_stdout,sig->trust_regexp,
strlen(sig->trust_regexp), ":", NULL);
printf(":");
}
else
printf("%c %s %s ",
sigrc, keystr(sig->keyid), datestr_from_sig(sig));
if( sigrc == '%' )
printf("[%s] ", g10_errstr(rc2) );
else if( sigrc == '?' )
;
else if( is_selfsig ) {
if( opt.with_colons )
putchar(':');
fputs( sig->sig_class == 0x18? "[keybind]":"[selfsig]", stdout);
if( opt.with_colons )
putchar(':');
}
else if( !opt.fast_list_mode ) {
p = get_user_id( sig->keyid, &n );
es_write_sanitized (es_stdout, p, n,
opt.with_colons?":":NULL, NULL );
xfree(p);
}
if( opt.with_colons )
printf(":%02x%c:", sig->sig_class, sig->flags.exportable?'x':'l');
putchar('\n');
}
else
log_error("invalid node with packet of type %d\n", node->pkt->pkttype);
}
int
proc_packets (ctrl_t ctrl, void *anchor, IOBUF a )
{
int rc;
CTX c = xmalloc_clear( sizeof *c );
c->ctrl = ctrl;
c->anchor = anchor;
rc = do_proc_packets( c, a );
xfree( c );
return rc;
}
int
proc_signature_packets (ctrl_t ctrl, void *anchor, IOBUF a,
strlist_t signedfiles, const char *sigfilename )
{
CTX c = xmalloc_clear( sizeof *c );
int rc;
c->ctrl = ctrl;
c->anchor = anchor;
c->sigs_only = 1;
c->signed_data.data_fd = -1;
c->signed_data.data_names = signedfiles;
c->signed_data.used = !!signedfiles;
c->sigfilename = sigfilename;
rc = do_proc_packets( c, a );
/* If we have not encountered any signature we print an error
messages, send a NODATA status back and return an error code.
Using log_error is required because verify_files does not check
error codes for each file but we want to terminate the process
with an error. */
if (!rc && !c->any.sig_seen)
{
write_status_text (STATUS_NODATA, "4");
log_error (_("no signature found\n"));
rc = G10ERR_NO_DATA;
}
/* Propagate the signature seen flag upward. Do this only on
success so that we won't issue the nodata status several
times. */
if (!rc && c->anchor && c->any.sig_seen)
c->anchor->any.sig_seen = 1;
xfree( c );
return rc;
}
int
proc_signature_packets_by_fd (ctrl_t ctrl,
void *anchor, IOBUF a, int signed_data_fd )
{
int rc;
CTX c;
c = xtrycalloc (1, sizeof *c);
if (!c)
return gpg_error_from_syserror ();
c->ctrl = ctrl;
c->anchor = anchor;
c->sigs_only = 1;
c->signed_data.data_fd = signed_data_fd;
c->signed_data.data_names = NULL;
c->signed_data.used = (signed_data_fd != -1);
rc = do_proc_packets ( c, a );
/* If we have not encountered any signature we print an error
messages, send a NODATA status back and return an error code.
Using log_error is required because verify_files does not check
error codes for each file but we want to terminate the process
with an error. */
if (!rc && !c->any.sig_seen)
{
write_status_text (STATUS_NODATA, "4");
log_error (_("no signature found\n"));
rc = gpg_error (GPG_ERR_NO_DATA);
}
/* Propagate the signature seen flag upward. Do this only on success
so that we won't issue the nodata status several times. */
if (!rc && c->anchor && c->any.sig_seen)
c->anchor->any.sig_seen = 1;
xfree ( c );
return rc;
}
int
proc_encryption_packets (ctrl_t ctrl, void *anchor, IOBUF a )
{
CTX c = xmalloc_clear( sizeof *c );
int rc;
c->ctrl = ctrl;
c->anchor = anchor;
c->encrypt_only = 1;
rc = do_proc_packets( c, a );
xfree( c );
return rc;
}
static int
check_nesting (CTX c)
{
int level;
for (level=0; c; c = c->anchor)
level++;
if (level > MAX_NESTING_DEPTH)
{
log_error ("input data with too deeply nested packets\n");
write_status_text (STATUS_UNEXPECTED, "1");
return GPG_ERR_BAD_DATA;
}
return 0;
}
static int
do_proc_packets( CTX c, IOBUF a )
{
PACKET *pkt;
int rc = 0;
int any_data = 0;
int newpkt;
rc = check_nesting (c);
if (rc)
return rc;
pkt = xmalloc( sizeof *pkt );
c->iobuf = a;
init_packet(pkt);
while( (rc=parse_packet(a, pkt)) != -1 ) {
any_data = 1;
if( rc ) {
free_packet(pkt);
/* stop processing when an invalid packet has been encountered
* but don't do so when we are doing a --list-packets. */
if (gpg_err_code (rc) == GPG_ERR_INV_PACKET
&& opt.list_packets != 2 )
break;
continue;
}
newpkt = -1;
if( opt.list_packets ) {
switch( pkt->pkttype ) {
case PKT_PUBKEY_ENC: proc_pubkey_enc( c, pkt ); break;
case PKT_SYMKEY_ENC: proc_symkey_enc( c, pkt ); break;
case PKT_ENCRYPTED:
case PKT_ENCRYPTED_MDC: proc_encrypted( c, pkt ); break;
case PKT_COMPRESSED: rc = proc_compressed( c, pkt ); break;
default: newpkt = 0; break;
}
}
else if( c->sigs_only ) {
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
case PKT_USER_ID:
case PKT_SYMKEY_ENC:
case PKT_PUBKEY_ENC:
case PKT_ENCRYPTED:
case PKT_ENCRYPTED_MDC:
write_status_text( STATUS_UNEXPECTED, "0" );
rc = G10ERR_UNEXPECTED;
goto leave;
case PKT_SIGNATURE: newpkt = add_signature( c, pkt ); break;
case PKT_PLAINTEXT: proc_plaintext( c, pkt ); break;
case PKT_COMPRESSED: rc = proc_compressed( c, pkt ); break;
case PKT_ONEPASS_SIG: newpkt = add_onepass_sig( c, pkt ); break;
case PKT_GPG_CONTROL: newpkt = add_gpg_control(c, pkt); break;
default: newpkt = 0; break;
}
}
else if( c->encrypt_only ) {
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
case PKT_USER_ID:
write_status_text( STATUS_UNEXPECTED, "0" );
rc = G10ERR_UNEXPECTED;
goto leave;
case PKT_SIGNATURE: newpkt = add_signature( c, pkt ); break;
case PKT_SYMKEY_ENC: proc_symkey_enc( c, pkt ); break;
case PKT_PUBKEY_ENC: proc_pubkey_enc( c, pkt ); break;
case PKT_ENCRYPTED:
case PKT_ENCRYPTED_MDC: proc_encrypted( c, pkt ); break;
case PKT_PLAINTEXT: proc_plaintext( c, pkt ); break;
case PKT_COMPRESSED: rc = proc_compressed( c, pkt ); break;
case PKT_ONEPASS_SIG: newpkt = add_onepass_sig( c, pkt ); break;
case PKT_GPG_CONTROL: newpkt = add_gpg_control(c, pkt); break;
default: newpkt = 0; break;
}
}
else {
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
release_list( c );
c->list = new_kbnode( pkt );
newpkt = 1;
break;
case PKT_PUBLIC_SUBKEY:
case PKT_SECRET_SUBKEY:
newpkt = add_subkey( c, pkt );
break;
case PKT_USER_ID: newpkt = add_user_id( c, pkt ); break;
case PKT_SIGNATURE: newpkt = add_signature( c, pkt ); break;
case PKT_PUBKEY_ENC: proc_pubkey_enc( c, pkt ); break;
case PKT_SYMKEY_ENC: proc_symkey_enc( c, pkt ); break;
case PKT_ENCRYPTED:
case PKT_ENCRYPTED_MDC: proc_encrypted( c, pkt ); break;
case PKT_PLAINTEXT: proc_plaintext( c, pkt ); break;
case PKT_COMPRESSED: rc = proc_compressed( c, pkt ); break;
case PKT_ONEPASS_SIG: newpkt = add_onepass_sig( c, pkt ); break;
case PKT_GPG_CONTROL: newpkt = add_gpg_control(c, pkt); break;
case PKT_RING_TRUST: newpkt = add_ring_trust( c, pkt ); break;
default: newpkt = 0; break;
}
}
if (rc)
goto leave;
/* This is a very ugly construct and frankly, I don't remember why
* I used it. Adding the MDC check here is a hack.
* The right solution is to initiate another context for encrypted
* packet and not to reuse the current one ... It works right
* when there is a compression packet inbetween which adds just
* an extra layer.
* Hmmm: Rewrite this whole module here??
*/
if( pkt->pkttype != PKT_SIGNATURE && pkt->pkttype != PKT_MDC )
c->any.data = (pkt->pkttype == PKT_PLAINTEXT);
if( newpkt == -1 )
;
else if( newpkt ) {
pkt = xmalloc( sizeof *pkt );
init_packet(pkt);
}
else
free_packet(pkt);
}
if( rc == G10ERR_INVALID_PACKET )
write_status_text( STATUS_NODATA, "3" );
if( any_data )
rc = 0;
else if( rc == -1 )
write_status_text( STATUS_NODATA, "2" );
leave:
release_list( c );
xfree(c->dek);
free_packet( pkt );
xfree( pkt );
free_md_filter_context( &c->mfx );
return rc;
}
/* Helper for pka_uri_from_sig to parse the to-be-verified address out
of the notation data. */
static pka_info_t *
get_pka_address (PKT_signature *sig)
{
pka_info_t *pka = NULL;
struct notation *nd,*notation;
notation=sig_to_notation(sig);
for(nd=notation;nd;nd=nd->next)
{
if(strcmp(nd->name,"pka-address@gnupg.org")!=0)
continue; /* Not the notation we want. */
/* For now we only use the first valid PKA notation. In future
we might want to keep additional PKA notations in a linked
list. */
if (is_valid_mailbox (nd->value))
{
pka = xmalloc (sizeof *pka + strlen(nd->value));
pka->valid = 0;
pka->checked = 0;
pka->uri = NULL;
strcpy (pka->email, nd->value);
break;
}
}
free_notation(notation);
return pka;
}
/* Return the URI from a DNS PKA record. If this record has already
be retrieved for the signature we merely return it; if not we go
out and try to get that DNS record. */
static const char *
pka_uri_from_sig (PKT_signature *sig)
{
if (!sig->flags.pka_tried)
{
assert (!sig->pka_info);
sig->flags.pka_tried = 1;
sig->pka_info = get_pka_address (sig);
if (sig->pka_info)
{
char *uri;
uri = get_pka_info (sig->pka_info->email, sig->pka_info->fpr);
if (uri)
{
sig->pka_info->valid = 1;
if (!*uri)
xfree (uri);
else
sig->pka_info->uri = uri;
}
}
}
return sig->pka_info? sig->pka_info->uri : NULL;
}
static int
check_sig_and_print( CTX c, KBNODE node )
{
PKT_signature *sig = node->pkt->pkt.signature;
const char *astr;
int rc, is_expkey=0, is_revkey=0;
if (opt.skip_verify)
{
log_info(_("signature verification suppressed\n"));
return 0;
}
/* Check that the message composition is valid.
Per RFC-2440bis (-15) allowed:
S{1,n} -- detached signature.
S{1,n} P -- old style PGP2 signature
O{1,n} P S{1,n} -- standard OpenPGP signature.
C P S{1,n} -- cleartext signature.
O = One-Pass Signature packet.
S = Signature packet.
P = OpenPGP Message packet (Encrypted | Compressed | Literal)
(Note that the current rfc2440bis draft also allows
for a signed message but that does not work as it
introduces ambiguities.)
We keep track of these packages using the marker packet
CTRLPKT_PLAINTEXT_MARK.
C = Marker packet for cleartext signatures.
We reject all other messages.
Actually we are calling this too often, i.e. for verification of
each message but better have some duplicate work than to silently
introduce a bug here.
*/
{
KBNODE n;
int n_onepass, n_sig;
/* log_debug ("checking signature packet composition\n"); */
/* dump_kbnode (c->list); */
n = c->list;
assert (n);
if ( n->pkt->pkttype == PKT_SIGNATURE )
{
/* This is either "S{1,n}" case (detached signature) or
"S{1,n} P" (old style PGP2 signature). */
for (n = n->next; n; n = n->next)
if (n->pkt->pkttype != PKT_SIGNATURE)
break;
if (!n)
; /* Okay, this is a detached signature. */
else if (n->pkt->pkttype == PKT_GPG_CONTROL
&& (n->pkt->pkt.gpg_control->control
== CTRLPKT_PLAINTEXT_MARK) )
{
if (n->next)
goto ambiguous; /* We only allow one P packet. */
}
else
goto ambiguous;
}
else if (n->pkt->pkttype == PKT_ONEPASS_SIG)
{
/* This is the "O{1,n} P S{1,n}" case (standard signature). */
for (n_onepass=1, n = n->next;
n && n->pkt->pkttype == PKT_ONEPASS_SIG; n = n->next)
n_onepass++;
if (!n || !(n->pkt->pkttype == PKT_GPG_CONTROL
&& (n->pkt->pkt.gpg_control->control
== CTRLPKT_PLAINTEXT_MARK)))
goto ambiguous;
for (n_sig=0, n = n->next;
n && n->pkt->pkttype == PKT_SIGNATURE; n = n->next)
n_sig++;
if (!n_sig)
goto ambiguous;
/* If we wanted to disallow multiple sig verification, we'd do
something like this:
if (n && !opt.allow_multisig_verification)
goto ambiguous;
However, now that we have --allow-multiple-messages, this
can stay allowable as we can't get here unless multiple
messages (i.e. multiple literals) are allowed. */
if (n_onepass != n_sig)
{
log_info ("number of one-pass packets does not match "
"number of signature packets\n");
goto ambiguous;
}
}
else if (n->pkt->pkttype == PKT_GPG_CONTROL
&& n->pkt->pkt.gpg_control->control == CTRLPKT_CLEARSIGN_START )
{
/* This is the "C P S{1,n}" case (clear text signature). */
n = n->next;
if (!n || !(n->pkt->pkttype == PKT_GPG_CONTROL
&& (n->pkt->pkt.gpg_control->control
== CTRLPKT_PLAINTEXT_MARK)))
goto ambiguous;
for (n_sig=0, n = n->next;
n && n->pkt->pkttype == PKT_SIGNATURE; n = n->next)
n_sig++;
if (n || !n_sig)
goto ambiguous;
}
else
{
ambiguous:
log_error(_("can't handle this ambiguous signature data\n"));
return 0;
}
}
/* (Indendation below not yet changed to GNU style.) */
astr = openpgp_pk_algo_name ( sig->pubkey_algo );
if(keystrlen()>8)
{
log_info(_("Signature made %s\n"),asctimestamp(sig->timestamp));
log_info(_(" using %s key %s\n"),
astr? astr: "?",keystr(sig->keyid));
}
else
log_info(_("Signature made %s using %s key ID %s\n"),
asctimestamp(sig->timestamp), astr? astr: "?",
keystr(sig->keyid));
rc = do_check_sig(c, node, NULL, &is_expkey, &is_revkey );
/* If the key isn't found, check for a preferred keyserver */
if(rc==G10ERR_NO_PUBKEY && sig->flags.pref_ks)
{
const byte *p;
int seq=0;
size_t n;
while((p=enum_sig_subpkt(sig->hashed,SIGSUBPKT_PREF_KS,&n,&seq,NULL)))
{
/* According to my favorite copy editor, in English
grammar, you say "at" if the key is located on a web
page, but "from" if it is located on a keyserver. I'm
not going to even try to make two strings here :) */
log_info(_("Key available at: ") );
print_utf8_buffer (log_get_stream(), p, n);
log_printf ("\n");
if(opt.keyserver_options.options&KEYSERVER_AUTO_KEY_RETRIEVE
&& opt.keyserver_options.options&KEYSERVER_HONOR_KEYSERVER_URL)
{
struct keyserver_spec *spec;
spec=parse_preferred_keyserver(sig);
if(spec)
{
int res;
glo_ctrl.in_auto_key_retrieve++;
res = keyserver_import_keyid (c->ctrl, sig->keyid,spec);
glo_ctrl.in_auto_key_retrieve--;
if(!res)
rc=do_check_sig(c, node, NULL, &is_expkey, &is_revkey );
free_keyserver_spec(spec);
if(!rc)
break;
}
}
}
}
/* If the preferred keyserver thing above didn't work, our second
try is to use the URI from a DNS PKA record. */
if ( rc == G10ERR_NO_PUBKEY
&& opt.keyserver_options.options&KEYSERVER_AUTO_KEY_RETRIEVE
&& opt.keyserver_options.options&KEYSERVER_HONOR_PKA_RECORD)
{
const char *uri = pka_uri_from_sig (sig);
if (uri)
{
/* FIXME: We might want to locate the key using the
fingerprint instead of the keyid. */
int res;
struct keyserver_spec *spec;
spec = parse_keyserver_uri (uri, 1, NULL, 0);
if (spec)
{
glo_ctrl.in_auto_key_retrieve++;
res = keyserver_import_keyid (c->ctrl, sig->keyid, spec);
glo_ctrl.in_auto_key_retrieve--;
free_keyserver_spec (spec);
if (!res)
rc = do_check_sig(c, node, NULL, &is_expkey, &is_revkey );
}
}
}
/* If the preferred keyserver thing above didn't work and we got
no information from the DNS PKA, this is a third try. */
if( rc == G10ERR_NO_PUBKEY && opt.keyserver
&& opt.keyserver_options.options&KEYSERVER_AUTO_KEY_RETRIEVE)
{
int res;
glo_ctrl.in_auto_key_retrieve++;
res=keyserver_import_keyid (c->ctrl, sig->keyid, opt.keyserver );
glo_ctrl.in_auto_key_retrieve--;
if(!res)
rc = do_check_sig(c, node, NULL, &is_expkey, &is_revkey );
}
if( !rc || gpg_err_code (rc) == GPG_ERR_BAD_SIGNATURE ) {
KBNODE un, keyblock;
int count=0, statno;
char keyid_str[50];
PKT_public_key *pk=NULL;
if(rc)
statno=STATUS_BADSIG;
else if(sig->flags.expired)
statno=STATUS_EXPSIG;
else if(is_expkey)
statno=STATUS_EXPKEYSIG;
else if(is_revkey)
statno=STATUS_REVKEYSIG;
else
statno=STATUS_GOODSIG;
keyblock = get_pubkeyblock( sig->keyid );
sprintf (keyid_str, "%08lX%08lX [uncertain] ",
(ulong)sig->keyid[0], (ulong)sig->keyid[1]);
/* find and print the primary user ID */
for( un=keyblock; un; un = un->next ) {
char *p;
int valid;
if(un->pkt->pkttype==PKT_PUBLIC_KEY)
{
pk=un->pkt->pkt.public_key;
continue;
}
if( un->pkt->pkttype != PKT_USER_ID )
continue;
if ( !un->pkt->pkt.user_id->created )
continue;
if ( un->pkt->pkt.user_id->is_revoked )
continue;
if ( un->pkt->pkt.user_id->is_expired )
continue;
if ( !un->pkt->pkt.user_id->is_primary )
continue;
/* We want the textual primary user ID here */
if ( un->pkt->pkt.user_id->attrib_data )
continue;
assert(pk);
/* Get it before we print anything to avoid interrupting
the output with the "please do a --check-trustdb"
line. */
valid=get_validity(pk,un->pkt->pkt.user_id);
keyid_str[17] = 0; /* cut off the "[uncertain]" part */
write_status_text_and_buffer (statno, keyid_str,
un->pkt->pkt.user_id->name,
un->pkt->pkt.user_id->len,
-1 );
p=utf8_to_native(un->pkt->pkt.user_id->name,
un->pkt->pkt.user_id->len,0);
if(rc)
log_info(_("BAD signature from \"%s\""),p);
else if(sig->flags.expired)
log_info(_("Expired signature from \"%s\""),p);
else
log_info(_("Good signature from \"%s\""),p);
xfree(p);
if(opt.verify_options&VERIFY_SHOW_UID_VALIDITY)
log_printf (" [%s]\n",trust_value_to_string(valid));
else
log_printf ("\n");
count++;
}
if( !count ) { /* just in case that we have no valid textual
userid */
char *p;
/* Try for an invalid textual userid */
for( un=keyblock; un; un = un->next ) {
if( un->pkt->pkttype == PKT_USER_ID &&
!un->pkt->pkt.user_id->attrib_data )
break;
}
/* Try for any userid at all */
if(!un) {
for( un=keyblock; un; un = un->next ) {
if( un->pkt->pkttype == PKT_USER_ID )
break;
}
}
if (opt.trust_model==TM_ALWAYS || !un)
keyid_str[17] = 0; /* cut off the "[uncertain]" part */
write_status_text_and_buffer (statno, keyid_str,
un? un->pkt->pkt.user_id->name:"[?]",
un? un->pkt->pkt.user_id->len:3,
-1 );
if(un)
p=utf8_to_native(un->pkt->pkt.user_id->name,
un->pkt->pkt.user_id->len,0);
else
p=xstrdup("[?]");
if(rc)
log_info(_("BAD signature from \"%s\""),p);
else if(sig->flags.expired)
log_info(_("Expired signature from \"%s\""),p);
else
log_info(_("Good signature from \"%s\""),p);
if (opt.trust_model!=TM_ALWAYS && un)
log_printf (" %s",_("[uncertain]") );
log_printf ("\n");
}
/* If we have a good signature and already printed
* the primary user ID, print all the other user IDs */
if ( count && !rc
&& !(opt.verify_options&VERIFY_SHOW_PRIMARY_UID_ONLY)) {
char *p;
for( un=keyblock; un; un = un->next ) {
if( un->pkt->pkttype != PKT_USER_ID )
continue;
if((un->pkt->pkt.user_id->is_revoked
|| un->pkt->pkt.user_id->is_expired)
&& !(opt.verify_options&VERIFY_SHOW_UNUSABLE_UIDS))
continue;
/* Only skip textual primaries */
if ( un->pkt->pkt.user_id->is_primary &&
!un->pkt->pkt.user_id->attrib_data )
continue;
if(un->pkt->pkt.user_id->attrib_data)
{
dump_attribs (un->pkt->pkt.user_id, pk);
if(opt.verify_options&VERIFY_SHOW_PHOTOS)
show_photos(un->pkt->pkt.user_id->attribs,
un->pkt->pkt.user_id->numattribs,
pk ,un->pkt->pkt.user_id);
}
p=utf8_to_native(un->pkt->pkt.user_id->name,
un->pkt->pkt.user_id->len,0);
log_info(_(" aka \"%s\""),p);
xfree(p);
if(opt.verify_options&VERIFY_SHOW_UID_VALIDITY)
{
const char *valid;
if(un->pkt->pkt.user_id->is_revoked)
valid=_("revoked");
else if(un->pkt->pkt.user_id->is_expired)
valid=_("expired");
else
valid=trust_value_to_string(get_validity(pk,
un->pkt->
pkt.user_id));
log_printf (" [%s]\n",valid);
}
else
log_printf ("\n");
}
}
release_kbnode( keyblock );
if( !rc )
{
if(opt.verify_options&VERIFY_SHOW_POLICY_URLS)
show_policy_url(sig,0,1);
else
show_policy_url(sig,0,2);
if(opt.verify_options&VERIFY_SHOW_KEYSERVER_URLS)
show_keyserver_url(sig,0,1);
else
show_keyserver_url(sig,0,2);
if(opt.verify_options&VERIFY_SHOW_NOTATIONS)
show_notation(sig,0,1,
((opt.verify_options&VERIFY_SHOW_STD_NOTATIONS)?1:0)+
((opt.verify_options&VERIFY_SHOW_USER_NOTATIONS)?2:0));
else
show_notation(sig,0,2,0);
}
if( !rc && is_status_enabled() ) {
/* print a status response with the fingerprint */
PKT_public_key *vpk = xmalloc_clear( sizeof *vpk );
if( !get_pubkey( vpk, sig->keyid ) ) {
byte array[MAX_FINGERPRINT_LEN], *p;
char buf[MAX_FINGERPRINT_LEN*4+90], *bufp;
size_t i, n;
bufp = buf;
fingerprint_from_pk( vpk, array, &n );
p = array;
for(i=0; i < n ; i++, p++, bufp += 2)
sprintf(bufp, "%02X", *p );
/* TODO: Replace the reserved '0' in the field below
with bits for status flags (policy url, notation,
etc.). Remember to make the buffer larger to
match! */
sprintf(bufp, " %s %lu %lu %d 0 %d %d %02X ",
strtimestamp( sig->timestamp ),
(ulong)sig->timestamp,(ulong)sig->expiredate,
sig->version,sig->pubkey_algo,sig->digest_algo,
sig->sig_class);
bufp = bufp + strlen (bufp);
if (!vpk->flags.primary) {
u32 akid[2];
akid[0] = vpk->main_keyid[0];
akid[1] = vpk->main_keyid[1];
free_public_key (vpk);
vpk = xmalloc_clear( sizeof *vpk );
if (get_pubkey (vpk, akid)) {
/* impossible error, we simply return a zeroed out fpr */
n = MAX_FINGERPRINT_LEN < 20? MAX_FINGERPRINT_LEN : 20;
memset (array, 0, n);
}
else
fingerprint_from_pk( vpk, array, &n );
}
p = array;
for(i=0; i < n ; i++, p++, bufp += 2)
sprintf(bufp, "%02X", *p );
write_status_text( STATUS_VALIDSIG, buf );
}
free_public_key( vpk );
}
if (!rc)
{
if(opt.verify_options&VERIFY_PKA_LOOKUPS)
pka_uri_from_sig (sig); /* Make sure PKA info is available. */
rc = check_signatures_trust( sig );
}
if(sig->flags.expired)
{
log_info(_("Signature expired %s\n"),
asctimestamp(sig->expiredate));
rc=G10ERR_GENERAL; /* need a better error here? */
}
else if(sig->expiredate)
log_info(_("Signature expires %s\n"),asctimestamp(sig->expiredate));
if(opt.verbose)
log_info(_("%s signature, digest algorithm %s\n"),
sig->sig_class==0x00?_("binary"):
sig->sig_class==0x01?_("textmode"):_("unknown"),
gcry_md_algo_name (sig->digest_algo));
if( rc )
g10_errors_seen = 1;
if( opt.batch && rc )
g10_exit(1);
}
else {
char buf[50];
sprintf(buf, "%08lX%08lX %d %d %02x %lu %d",
(ulong)sig->keyid[0], (ulong)sig->keyid[1],
sig->pubkey_algo, sig->digest_algo,
sig->sig_class, (ulong)sig->timestamp, rc );
write_status_text( STATUS_ERRSIG, buf );
if( rc == G10ERR_NO_PUBKEY ) {
buf[16] = 0;
write_status_text( STATUS_NO_PUBKEY, buf );
}
if( rc != G10ERR_NOT_PROCESSED )
log_error(_("Can't check signature: %s\n"), g10_errstr(rc) );
}
return rc;
}
/****************
* Process the tree which starts at node
*/
static void
proc_tree( CTX c, KBNODE node )
{
KBNODE n1;
int rc;
if( opt.list_packets || opt.list_only )
return;
/* we must skip our special plaintext marker packets here becuase
they may be the root packet. These packets are only used in
addionla checks and skipping them here doesn't matter */
while ( node
&& node->pkt->pkttype == PKT_GPG_CONTROL
&& node->pkt->pkt.gpg_control->control
== CTRLPKT_PLAINTEXT_MARK ) {
node = node->next;
}
if (!node)
return;
c->trustletter = ' ';
if( node->pkt->pkttype == PKT_PUBLIC_KEY
|| node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
merge_keys_and_selfsig( node );
list_node( c, node );
}
else if( node->pkt->pkttype == PKT_SECRET_KEY ) {
merge_keys_and_selfsig( node );
list_node( c, node );
}
else if( node->pkt->pkttype == PKT_ONEPASS_SIG ) {
/* check all signatures */
if( !c->any.data ) {
int use_textmode = 0;
free_md_filter_context( &c->mfx );
/* prepare to create all requested message digests */
if (gcry_md_open (&c->mfx.md, 0, 0))
BUG ();
/* fixme: why looking for the signature packet and not the
one-pass packet? */
for ( n1 = node; (n1 = find_next_kbnode(n1, PKT_SIGNATURE )); )
{
gcry_md_enable (c->mfx.md,
n1->pkt->pkt.signature->digest_algo);
}
if (n1 && n1->pkt->pkt.onepass_sig->sig_class == 0x01)
use_textmode = 1;
/* Ask for file and hash it. */
if( c->sigs_only ) {
if (c->signed_data.used && c->signed_data.data_fd != -1)
rc = hash_datafile_by_fd (c->mfx.md, NULL,
c->signed_data.data_fd,
use_textmode);
else
rc = hash_datafiles (c->mfx.md, NULL,
c->signed_data.data_names,
c->sigfilename,
use_textmode );
}
else {
rc = ask_for_detached_datafile (c->mfx.md, c->mfx.md2,
iobuf_get_real_fname(c->iobuf),
use_textmode );
}
if( rc ) {
log_error("can't hash datafile: %s\n", g10_errstr(rc));
return;
}
}
else if ( c->signed_data.used ) {
log_error (_("not a detached signature\n") );
return;
}
for( n1 = node; (n1 = find_next_kbnode(n1, PKT_SIGNATURE )); )
check_sig_and_print( c, n1 );
}
else if( node->pkt->pkttype == PKT_GPG_CONTROL
&& node->pkt->pkt.gpg_control->control
== CTRLPKT_CLEARSIGN_START ) {
/* clear text signed message */
if( !c->any.data ) {
log_error("cleartext signature without data\n" );
return;
}
else if ( c->signed_data.used ) {
log_error (_("not a detached signature\n") );
return;
}
for( n1 = node; (n1 = find_next_kbnode(n1, PKT_SIGNATURE )); )
check_sig_and_print( c, n1 );
}
else if( node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *sig = node->pkt->pkt.signature;
int multiple_ok=1;
n1=find_next_kbnode(node, PKT_SIGNATURE);
if(n1)
{
byte class=sig->sig_class;
byte hash=sig->digest_algo;
for(; n1; (n1 = find_next_kbnode(n1, PKT_SIGNATURE)))
{
/* We can't currently handle multiple signatures of
different classes or digests (we'd pretty much have
to run a different hash context for each), but if
they are all the same, make an exception. */
if(n1->pkt->pkt.signature->sig_class!=class
|| n1->pkt->pkt.signature->digest_algo!=hash)
{
multiple_ok=0;
log_info(_("WARNING: multiple signatures detected. "
"Only the first will be checked.\n"));
break;
}
}
}
if( sig->sig_class != 0x00 && sig->sig_class != 0x01 )
log_info(_("standalone signature of class 0x%02x\n"),
sig->sig_class);
else if( !c->any.data ) {
/* detached signature */
free_md_filter_context( &c->mfx );
if (gcry_md_open (&c->mfx.md, sig->digest_algo, 0))
BUG ();
if( !opt.pgp2_workarounds )
;
else if( sig->digest_algo == DIGEST_ALGO_MD5
&& is_RSA( sig->pubkey_algo ) ) {
/* enable a workaround for a pgp2 bug */
if (gcry_md_open (&c->mfx.md2, DIGEST_ALGO_MD5, 0))
BUG ();
}
else if( sig->digest_algo == DIGEST_ALGO_SHA1
&& sig->pubkey_algo == PUBKEY_ALGO_DSA
&& sig->sig_class == 0x01 ) {
/* enable the workaround also for pgp5 when the detached
* signature has been created in textmode */
if (gcry_md_open (&c->mfx.md2, sig->digest_algo, 0 ))
BUG ();
}
#if 0 /* workaround disabled */
/* Here we have another hack to work around a pgp 2 bug
* It works by not using the textmode for detached signatures;
* this will let the first signature check (on md) fail
* but the second one (on md2) which adds an extra CR should
* then produce the "correct" hash. This is very, very ugly
* hack but it may help in some cases (and break others)
*/
/* c->mfx.md2? 0 :(sig->sig_class == 0x01) */
#endif
if ( DBG_HASHING ) {
gcry_md_debug( c->mfx.md, "verify" );
if ( c->mfx.md2 )
gcry_md_debug( c->mfx.md2, "verify2" );
}
if( c->sigs_only ) {
if (c->signed_data.used && c->signed_data.data_fd != -1)
rc = hash_datafile_by_fd (c->mfx.md, c->mfx.md2,
c->signed_data.data_fd,
(sig->sig_class == 0x01));
else
rc = hash_datafiles (c->mfx.md, c->mfx.md2,
c->signed_data.data_names,
c->sigfilename,
(sig->sig_class == 0x01));
}
else {
rc = ask_for_detached_datafile( c->mfx.md, c->mfx.md2,
iobuf_get_real_fname(c->iobuf),
(sig->sig_class == 0x01) );
}
if( rc ) {
log_error("can't hash datafile: %s\n", g10_errstr(rc));
return;
}
}
else if ( c->signed_data.used ) {
log_error (_("not a detached signature\n") );
return;
}
else if (!opt.quiet)
log_info(_("old style (PGP 2.x) signature\n"));
if(multiple_ok)
for( n1 = node; n1; (n1 = find_next_kbnode(n1, PKT_SIGNATURE )) )
check_sig_and_print( c, n1 );
else
check_sig_and_print( c, node );
}
else {
dump_kbnode (c->list);
log_error(_("invalid root packet detected in proc_tree()\n"));
dump_kbnode (node);
}
}
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