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/* certpath.c - path validation
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <gcrypt.h>
#include <ksba.h>
#include "gpgsm.h"
#include "keydb.h"
#include "i18n.h"
int
gpgsm_validate_path (KsbaCert cert)
{
int rc = 0, depth = 0;
char *issuer = NULL;
char *subject = NULL;
KEYDB_HANDLE kh = keydb_new (0);
KsbaCert subject_cert = NULL, issuer_cert = NULL;
if (!kh)
{
log_error (_("failed to allocated keyDB handle\n"));
rc = GNUPG_General_Error;
goto leave;
}
gpgsm_dump_cert ("subject", cert);
subject_cert = cert;
for (;;)
{
xfree (issuer);
xfree (subject);
issuer = ksba_cert_get_issuer (subject_cert);
subject = ksba_cert_get_subject (subject_cert);
if (!issuer)
{
if (DBG_X509)
log_debug ("ERROR: issuer missing\n");
rc = GNUPG_Bad_Certificate;
goto leave;
}
if (subject && !strcmp (issuer, subject))
{
if (gpgsm_check_cert_sig (subject_cert, subject_cert) )
{
log_debug ("selfsigned certificate has a BAD signatures\n");
rc = depth? GNUPG_Bad_Certificate_Path : GNUPG_Bad_Certificate;
goto leave;
}
log_debug ("selfsigned certificate is good\n");
break; /* okay, a self-signed certicate is an end-point */
}
depth++;
/* fixme: check against a maximum path length */
/* find the next cert up the tree */
keydb_search_reset (kh);
rc = keydb_search_subject (kh, issuer);
if (rc)
{
log_debug ("failed to find issuer's certificate: rc=%d\n", rc);
rc = GNUPG_Missing_Certificate;
goto leave;
}
ksba_cert_release (issuer_cert); issuer_cert = NULL;
rc = keydb_get_cert (kh, &issuer_cert);
if (rc)
{
log_debug ("failed to get cert: rc=%d\n", rc);
rc = GNUPG_General_Error;
goto leave;
}
log_debug ("got issuer's certificate:\n");
gpgsm_dump_cert ("issuer", issuer_cert);
if (gpgsm_check_cert_sig (issuer_cert, subject_cert) )
{
log_debug ("certificate has a BAD signatures\n");
rc = GNUPG_Bad_Certificate_Path;
goto leave;
}
log_debug ("certificate is good\n");
keydb_search_reset (kh);
subject_cert = issuer_cert;
issuer_cert = NULL;
}
leave:
xfree (issuer);
keydb_release (kh);
ksba_cert_release (issuer_cert);
if (subject_cert != cert)
ksba_cert_release (subject_cert);
return rc;
}
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