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	/* verify.c - Verify a messages signature
	* Copyright (C) 2001, 2002, 2003, 2007,
	* 2010 Free Software Foundation, Inc.
	* Copyright (C) 2001-2019 Werner Koch
	* Copyright (C) 2015-2020 g10 Code GmbH
	*
	* 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 <https://www.gnu.org/licenses/>.
	* SPDX-License-Identifier: GPL-3.0-or-later
	*/

	#include <config.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <unistd.h>
	#include <time.h>

	#include "gpgsm.h"
	#include <gcrypt.h>
	#include <ksba.h>

	#include "keydb.h"
	#include "../common/i18n.h"
	#include "../common/compliance.h"

	static char *
	strtimestamp_r (ksba_isotime_t atime)
	{
	char *buffer = xmalloc (15);

	if (!atime \|\| !*atime)
	strcpy (buffer, "none");
	else
	sprintf (buffer, "%.4s-%.2s-%.2s", atime, atime+4, atime+6);
	return buffer;
	}



	/* Hash the data for a detached signature. Returns 0 on success. */
	static gpg_error_t
	hash_data (int fd, gcry_md_hd_t md)
	{
	gpg_error_t err = 0;
	estream_t fp;
	char buffer[4096];
	int nread;

	fp = es_fdopen_nc (fd, "rb");
	if (!fp)
	{
	err = gpg_error_from_syserror ();
	log_error ("fdopen(%d) failed: %s\n", fd, gpg_strerror (err));
	return err;
	}

	do
	{
	nread = es_fread (buffer, 1, DIM(buffer), fp);
	gcry_md_write (md, buffer, nread);
	}
	while (nread);
	if (es_ferror (fp))
	{
	err = gpg_error_from_syserror ();
	log_error ("read error on fd %d: %s\n", fd, gpg_strerror (err));
	}
	es_fclose (fp);
	return err;
	}




	/* Perform a verify operation. To verify detached signatures, DATA_FD
	must be different than -1. With OUT_FP given and a non-detached
	signature, the signed material is written to that stream. */
	int
	gpgsm_verify (ctrl_t ctrl, int in_fd, int data_fd, estream_t out_fp)
	{
	int i, rc;
	gnupg_ksba_io_t b64reader = NULL;
	gnupg_ksba_io_t b64writer = NULL;
	ksba_reader_t reader;
	ksba_writer_t writer = NULL;
	ksba_cms_t cms = NULL;
	ksba_stop_reason_t stopreason;
	ksba_cert_t cert;
	KEYDB_HANDLE kh;
	gcry_md_hd_t data_md = NULL;
	int signer;
	const char *algoid;
	int algo;
	int is_detached, maybe_detached;
	estream_t in_fp = NULL;
	char *p;

	audit_set_type (ctrl->audit, AUDIT_TYPE_VERIFY);

	/* Although we detect detached signatures during the parsing phase,
	* we need to know it earlier and thus accept the caller idea of
	* what to verify. */
	maybe_detached = (data_fd != -1);

	kh = keydb_new (ctrl);
	if (!kh)
	{
	log_error (_("failed to allocate keyDB handle\n"));
	rc = gpg_error (GPG_ERR_GENERAL);
	goto leave;
	}


	in_fp = es_fdopen_nc (in_fd, "rb");
	if (!in_fp)
	{
	rc = gpg_error_from_syserror ();
	log_error ("fdopen() failed: %s\n", strerror (errno));
	goto leave;
	}

	rc = gnupg_ksba_create_reader
	(&b64reader, ((ctrl->is_pem? GNUPG_KSBA_IO_PEM : 0)
	\| (ctrl->is_base64? GNUPG_KSBA_IO_BASE64 : 0)
	\| (ctrl->autodetect_encoding? GNUPG_KSBA_IO_AUTODETECT : 0)
	\| (maybe_detached? GNUPG_KSBA_IO_STRIP : 0)),
	in_fp, &reader);
	if (rc)
	{
	log_error ("can't create reader: %s\n", gpg_strerror (rc));
	goto leave;
	}

	if (out_fp)
	{
	rc = gnupg_ksba_create_writer
	(&b64writer, ((ctrl->create_pem? GNUPG_KSBA_IO_PEM : 0)
	\| (ctrl->create_base64? GNUPG_KSBA_IO_BASE64 : 0)),
	ctrl->pem_name, out_fp, &writer);
	if (rc)
	{
	log_error ("can't create writer: %s\n", gpg_strerror (rc));
	goto leave;
	}
	}

	rc = ksba_cms_new (&cms);
	if (rc)
	goto leave;

	rc = ksba_cms_set_reader_writer (cms, reader, writer);
	if (rc)
	{
	log_error ("ksba_cms_set_reader_writer failed: %s\n",
	gpg_strerror (rc));
	goto leave;
	}

	rc = gcry_md_open (&data_md, 0, 0);
	if (rc)
	{
	log_error ("md_open failed: %s\n", gpg_strerror (rc));
	goto leave;
	}
	if (DBG_HASHING)
	gcry_md_debug (data_md, "vrfy.data");

	audit_log (ctrl->audit, AUDIT_SETUP_READY);

	is_detached = 0;
	do
	{
	rc = ksba_cms_parse (cms, &stopreason);
	if (rc)
	{
	log_error ("ksba_cms_parse failed: %s\n", gpg_strerror (rc));
	goto leave;
	}

	if (stopreason == KSBA_SR_NEED_HASH)
	{
	is_detached = 1;
	audit_log (ctrl->audit, AUDIT_DETACHED_SIGNATURE);
	if (opt.verbose)
	log_info ("detached signature\n");
	}

	if (stopreason == KSBA_SR_NEED_HASH
	\|\| stopreason == KSBA_SR_BEGIN_DATA)
	{
	audit_log (ctrl->audit, AUDIT_GOT_DATA);

	/* We are now able to enable the hash algorithms */
	for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
	{
	algo = gcry_md_map_name (algoid);
	if (!algo)
	{
	log_error ("unknown hash algorithm '%s'\n",
	algoid? algoid:"?");
	if (algoid
	&& ( !strcmp (algoid, "1.2.840.113549.1.1.2")
	\|\|!strcmp (algoid, "1.2.840.113549.2.2")))
	log_info (_("(this is the MD2 algorithm)\n"));
	audit_log_s (ctrl->audit, AUDIT_BAD_DATA_HASH_ALGO, algoid);
	}
	else
	{
	if (DBG_X509)
	log_debug ("enabling hash algorithm %d (%s)\n",
	algo, algoid? algoid:"");
	gcry_md_enable (data_md, algo);
	audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
	}
	}
	if (opt.extra_digest_algo)
	{
	if (DBG_X509)
	log_debug ("enabling extra hash algorithm %d\n",
	opt.extra_digest_algo);
	gcry_md_enable (data_md, opt.extra_digest_algo);
	audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO,
	opt.extra_digest_algo);
	}
	if (is_detached)
	{
	if (data_fd == -1)
	{
	log_info ("detached signature w/o data "
	"- assuming certs-only\n");
	audit_log (ctrl->audit, AUDIT_CERT_ONLY_SIG);
	}
	else
	audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING,
	hash_data (data_fd, data_md));
	}
	else
	{
	ksba_cms_set_hash_function (cms, HASH_FNC, data_md);
	}
	}
	else if (stopreason == KSBA_SR_END_DATA)
	{ /* The data bas been hashed */
	audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING, 0);
	}
	}
	while (stopreason != KSBA_SR_READY);

	if (b64writer)
	{
	rc = gnupg_ksba_finish_writer (b64writer);
	if (rc)
	{
	log_error ("write failed: %s\n", gpg_strerror (rc));
	audit_log_ok (ctrl->audit, AUDIT_WRITE_ERROR, rc);
	goto leave;
	}
	}

	if (data_fd != -1 && !is_detached)
	{
	log_error ("data given for a non-detached signature\n");
	rc = gpg_error (GPG_ERR_CONFLICT);
	audit_log (ctrl->audit, AUDIT_USAGE_ERROR);
	goto leave;
	}

	for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
	{
	/* Fixme: it might be better to check the validity of the
	certificate first before entering it into the DB. This way
	we would avoid cluttering the DB with invalid
	certificates. */
	audit_log_cert (ctrl->audit, AUDIT_SAVE_CERT, cert,
	keydb_store_cert (ctrl, cert, 0, NULL));
	ksba_cert_release (cert);
	}

	cert = NULL;
	for (signer=0; ; signer++)
	{
	char *issuer = NULL;
	gcry_sexp_t sigval = NULL;
	ksba_isotime_t sigtime, keyexptime;
	ksba_sexp_t serial;
	char *msgdigest = NULL;
	size_t msgdigestlen;
	char *ctattr;
	int sigval_hash_algo;
	int info_pkalgo;
	unsigned int nbits;
	int pkalgo;
	char *pkalgostr = NULL;
	char *pkcurve = NULL;
	char *pkfpr = NULL;
	unsigned int pkalgoflags, verifyflags;

	rc = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
	if (!signer && gpg_err_code (rc) == GPG_ERR_NO_DATA
	&& data_fd == -1 && is_detached)
	{
	log_info ("certs-only message accepted\n");
	rc = 0;
	break;
	}
	if (rc)
	{
	if (signer && rc == -1)
	rc = 0;
	break;
	}

	gpgsm_status (ctrl, STATUS_NEWSIG, NULL);
	audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);

	if (DBG_X509)
	{
	log_debug ("signer %d - issuer: '%s'\n",
	signer, issuer? issuer:"[NONE]");
	log_debug ("signer %d - serial: ", signer);
	gpgsm_dump_serial (serial);
	log_printf ("\n");
	}
	if (ctrl->audit)
	{
	char *tmpstr = gpgsm_format_sn_issuer (serial, issuer);
	audit_log_s (ctrl->audit, AUDIT_SIG_NAME, tmpstr);
	xfree (tmpstr);
	}

	rc = ksba_cms_get_signing_time (cms, signer, sigtime);
	if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
	*sigtime = 0;
	else if (rc)
	{
	log_error ("error getting signing time: %s\n", gpg_strerror (rc));
	sigtime = 0; / (we can't encode an error in the time string.) */
	}

	rc = ksba_cms_get_message_digest (cms, signer,
	&msgdigest, &msgdigestlen);
	if (!rc)
	{
	algoid = ksba_cms_get_digest_algo (cms, signer);
	algo = gcry_md_map_name (algoid);
	if (DBG_X509)
	log_debug ("signer %d - digest algo: %d\n", signer, algo);
	if (! gcry_md_is_enabled (data_md, algo))
	{
	log_error ("digest algo %d (%s) has not been enabled\n",
	algo, algoid?algoid:"");
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "unsupported");
	goto next_signer;
	}
	}
	else if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
	{
	log_assert (!msgdigest);
	rc = 0;
	algoid = NULL;
	algo = 0;
	}
	else /* real error */
	{
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
	break;
	}

	rc = ksba_cms_get_sigattr_oids (cms, signer,
	"1.2.840.113549.1.9.3", &ctattr);
	if (!rc)
	{
	const char *s;

	if (DBG_X509)
	log_debug ("signer %d - content-type attribute: %s",
	signer, ctattr);

	s = ksba_cms_get_content_oid (cms, 1);
	if (!s \|\| strcmp (ctattr, s))
	{
	log_error ("content-type attribute does not match "
	"actual content-type\n");
	ksba_free (ctattr);
	ctattr = NULL;
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}
	ksba_free (ctattr);
	ctattr = NULL;
	}
	else if (rc != -1)
	{
	log_error ("error getting content-type attribute: %s\n",
	gpg_strerror (rc));
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}
	rc = 0;


	sigval = gpgsm_ksba_cms_get_sig_val (cms, signer);
	if (!sigval)
	{
	log_error ("no signature value available\n");
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}

	sigval_hash_algo = gpgsm_get_hash_algo_from_sigval (sigval, &pkalgoflags);
	if (DBG_X509)
	{
	log_debug ("signer %d - signature available (sigval hash=%d pkaf=%u)",
	signer, sigval_hash_algo, pkalgoflags);
	}
	if (!sigval_hash_algo)
	sigval_hash_algo = algo; /* Fallback used e.g. with old libksba. */

	/* Find the certificate of the signer */
	keydb_search_reset (kh);
	rc = keydb_search_issuer_sn (ctrl, kh, issuer, serial);
	if (rc)
	{
	if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
	{
	log_error ("certificate not found\n");
	rc = gpg_error (GPG_ERR_NO_PUBKEY);
	}
	else
	log_error ("failed to find the certificate: %s\n",
	gpg_strerror(rc));
	{
	char numbuf[50];
	sprintf (numbuf, "%d", rc);

	gpgsm_status2 (ctrl, STATUS_ERROR, "verify.findkey",
	numbuf, NULL);
	}
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "no-cert");
	goto next_signer;
	}

	rc = keydb_get_cert (kh, &cert);
	if (rc)
	{
	log_error ("failed to get cert: %s\n", gpg_strerror (rc));
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
	goto next_signer;
	}

	pkfpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
	pkalgostr = gpgsm_pubkey_algo_string (cert, NULL);
	pkalgo = gpgsm_get_key_algo_info2 (cert, &nbits, &pkcurve);
	/* Remap the ECC algo to the algo we use. Note that EdDSA has
	* already been mapped. */
	if (pkalgo == GCRY_PK_ECC)
	pkalgo = GCRY_PK_ECDSA;

	/* Print infos about the signature. */
	log_info (_("Signature made "));
	if (*sigtime)
	{
	/* We take the freedom as noted in RFC3339 to use a space
	* instead of the "T" delimiter between date and time. We
	* also append a separate UTC instead of a "Z" or "+00:00"
	* suffix because that makes it clear to everyone what kind
	* of time this is. */
	dump_isotime (sigtime);
	log_printf (" UTC");
	}
	else
	log_printf (_("[date not given]"));
	log_info (_(" using %s key %s\n"), pkalgostr, pkfpr);
	if (opt.verbose)
	{
	log_info (_("algorithm:"));
	log_printf (" %s + %s",
	pubkey_algo_to_string (pkalgo),
	gcry_md_algo_name (sigval_hash_algo));
	if (algo != sigval_hash_algo)
	log_printf (" (%s)", gcry_md_algo_name (algo));
	log_printf ("\n");
	}

	audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);

	/* Check compliance. */
	if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_VERIFICATION,
	pkalgo, pkalgoflags, NULL, nbits, NULL))
	{
	char kidstr[10+1];

	snprintf (kidstr, sizeof kidstr, "0x%08lX",
	gpgsm_get_short_fingerprint (cert, NULL));
	log_error (_("key %s may not be used for signing in %s mode\n"),
	kidstr,
	gnupg_compliance_option_string (opt.compliance));
	goto next_signer;
	}

	if (! gnupg_digest_is_allowed (opt.compliance, 0, sigval_hash_algo))
	{
	log_error (_("digest algorithm '%s' may not be used in %s mode\n"),
	gcry_md_algo_name (sigval_hash_algo),
	gnupg_compliance_option_string (opt.compliance));
	goto next_signer;
	}

	/* Print compliance warning for the key. */
	if (!opt.quiet
	&& !gnupg_pk_is_compliant (opt.compliance, pkalgo, pkalgoflags,
	NULL, nbits, pkcurve))
	{
	log_info (_("WARNING: This key is not suitable for signing"
	" in %s mode\n"),
	gnupg_compliance_option_string (opt.compliance));
	}

	/* Check compliance with CO_DE_VS. */
	if (gnupg_pk_is_compliant (CO_DE_VS, pkalgo, pkalgoflags,
	NULL, nbits, pkcurve)
	&& gnupg_gcrypt_is_compliant (CO_DE_VS)
	&& gnupg_digest_is_compliant (CO_DE_VS, sigval_hash_algo))
	gpgsm_status (ctrl, STATUS_VERIFICATION_COMPLIANCE_MODE,
	gnupg_status_compliance_flag (CO_DE_VS));
	else if (opt.require_compliance
	&& opt.compliance == CO_DE_VS)
	{
	log_error (_("operation forced to fail due to"
	" unfulfilled compliance rules\n"));
	gpgsm_errors_seen = 1;
	}

	/* Now we can check the signature. */
	if (msgdigest)
	{ /* Signed attributes are available. */
	gcry_md_hd_t md;
	unsigned char *s;

	/* Check that the message digest in the signed attributes
	matches the one we calculated on the data. */
	s = gcry_md_read (data_md, algo);
	if ( !s \|\| !msgdigestlen
	\|\| gcry_md_get_algo_dlen (algo) != msgdigestlen
	\|\| memcmp (s, msgdigest, msgdigestlen) )
	{
	char *fpr;

	log_error (_("invalid signature: message digest attribute "
	"does not match computed one\n"));
	if (DBG_X509)
	{
	if (msgdigest)
	log_printhex (msgdigest, msgdigestlen, "message: ");
	if (s)
	log_printhex (s, gcry_md_get_algo_dlen (algo),
	"computed: ");
	}
	fpr = gpgsm_fpr_and_name_for_status (cert);
	gpgsm_status (ctrl, STATUS_BADSIG, fpr);
	xfree (fpr);
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}

	audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO, sigval_hash_algo);
	rc = gcry_md_open (&md, sigval_hash_algo, 0);
	if (rc)
	{
	log_error ("md_open failed: %s\n", gpg_strerror (rc));
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
	goto next_signer;
	}
	if (DBG_HASHING)
	gcry_md_debug (md, "vrfy.attr");

	ksba_cms_set_hash_function (cms, HASH_FNC, md);
	rc = ksba_cms_hash_signed_attrs (cms, signer);
	if (rc)
	{
	log_error ("hashing signed attrs failed: %s\n",
	gpg_strerror (rc));
	gcry_md_close (md);
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
	goto next_signer;
	}
	rc = gpgsm_check_cms_signature (cert, sigval, md, sigval_hash_algo,
	pkalgoflags, &info_pkalgo);
	gcry_md_close (md);
	}
	else
	{
	rc = gpgsm_check_cms_signature (cert, sigval, data_md,
	algo, pkalgoflags, &info_pkalgo);
	}

	if (rc)
	{
	char *fpr;

	log_error ("invalid signature: %s\n", gpg_strerror (rc));
	fpr = gpgsm_fpr_and_name_for_status (cert);
	gpgsm_status (ctrl, STATUS_BADSIG, fpr);
	xfree (fpr);
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}
	rc = gpgsm_cert_use_verify_p (cert); /(this displays an info message)/
	if (rc)
	{
	gpgsm_status_with_err_code (ctrl, STATUS_ERROR, "verify.keyusage",
	gpg_err_code (rc));
	rc = 0;
	}

	if (DBG_X509)
	log_debug ("signature okay - checking certs\n");
	audit_log (ctrl->audit, AUDIT_VALIDATE_CHAIN);
	rc = gpgsm_validate_chain (ctrl, cert,
	*sigtime? sigtime : "19700101T000000",
	keyexptime, 0,
	NULL, 0, &verifyflags);
	{
	char fpr, buf, *tstr;

	fpr = gpgsm_fpr_and_name_for_status (cert);
	if (gpg_err_code (rc) == GPG_ERR_CERT_EXPIRED)
	{
	gpgsm_status (ctrl, STATUS_EXPKEYSIG, fpr);
	rc = 0;
	}
	else
	gpgsm_status (ctrl, STATUS_GOODSIG, fpr);

	xfree (fpr);

	/* FIXME: INFO_PKALGO correctly shows ECDSA but PKALGO is then
	* ECC. We should use the ECDSA here and need to find a way to
	* figure this out without using the bogus assumption in
	* gpgsm_check_cms_signature that ECC is always ECDSA. */

	fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
	tstr = strtimestamp_r (sigtime);
	buf = xasprintf ("%s %s %s %s 0 0 %d %d 00", fpr, tstr,
	*sigtime? sigtime : "0",
	*keyexptime? keyexptime : "0",
	info_pkalgo, algo);
	xfree (tstr);
	xfree (fpr);
	gpgsm_status (ctrl, STATUS_VALIDSIG, buf);
	xfree (buf);
	}

	audit_log_ok (ctrl->audit, AUDIT_CHAIN_STATUS, rc);
	if (rc) /* of validate_chain */
	{
	log_error ("invalid certification chain: %s\n", gpg_strerror (rc));
	if (gpg_err_code (rc) == GPG_ERR_BAD_CERT_CHAIN
	\|\| gpg_err_code (rc) == GPG_ERR_BAD_CERT
	\|\| gpg_err_code (rc) == GPG_ERR_BAD_CA_CERT
	\|\| gpg_err_code (rc) == GPG_ERR_CERT_REVOKED)
	gpgsm_status_with_err_code (ctrl, STATUS_TRUST_NEVER, NULL,
	gpg_err_code (rc));
	else
	gpgsm_status_with_err_code (ctrl, STATUS_TRUST_UNDEFINED, NULL,
	gpg_err_code (rc));
	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
	goto next_signer;
	}

	audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "good");

	for (i=0; (p = ksba_cert_get_subject (cert, i)); i++)
	{
	log_info (!i? _("Good signature from")
	: _(" aka"));
	log_printf (" \"");
	gpgsm_es_print_name (log_get_stream (), p);
	log_printf ("\"\n");
	ksba_free (p);
	}


	/* Print a note if this is a qualified signature. */
	{
	size_t qualbuflen;
	char qualbuffer[1];

	rc = ksba_cert_get_user_data (cert, "is_qualified", &qualbuffer,
	sizeof (qualbuffer), &qualbuflen);
	if (!rc && qualbuflen)
	{
	if (*qualbuffer)
	{
	log_info (_("This is a qualified signature\n"));
	if (!opt.qualsig_approval)
	log_info
	(_("Note, that this software is not officially approved "
	"to create or verify such signatures.\n"));
	}
	}
	else if (gpg_err_code (rc) != GPG_ERR_NOT_FOUND)
	log_error ("get_user_data(is_qualified) failed: %s\n",
	gpg_strerror (rc));
	}

	gpgsm_status (ctrl, STATUS_TRUST_FULLY,
	(verifyflags & VALIDATE_FLAG_STEED)?
	"0 steed":
	(verifyflags & VALIDATE_FLAG_CHAIN_MODEL)?
	"0 chain": "0 shell");

	next_signer:
	rc = 0;
	xfree (issuer);
	xfree (serial);
	gcry_sexp_release (sigval);
	xfree (msgdigest);
	xfree (pkalgostr);
	xfree (pkcurve);
	xfree (pkfpr);
	ksba_cert_release (cert);
	cert = NULL;
	}
	rc = 0;

	leave:
	ksba_cms_release (cms);
	gnupg_ksba_destroy_reader (b64reader);
	gnupg_ksba_destroy_writer (b64writer);
	keydb_release (kh);
	gcry_md_close (data_md);
	es_fclose (in_fp);

	if (rc)
	{
	char numbuf[50];
	sprintf (numbuf, "%d", rc );
	gpgsm_status2 (ctrl, STATUS_ERROR, "verify.leave",
	numbuf, NULL);
	}

	return rc;
	}

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