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