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151deac0df
* sign.c (add_certificate_list): New. (gpgsm_sign): Add the certificates to the CMS object. * certpath.c (gpgsm_walk_cert_chain): New. * gpgsm.h (server_control_s): Add included_certs. * gpgsm.c: Add option --include-certs. (gpgsm_init_default_ctrl): New. (main): Call it. * server.c (gpgsm_server): Ditto. (option_handler): Support --include-certs.
451 lines
12 KiB
C
451 lines
12 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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static int
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unknown_criticals (KsbaCert cert)
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{
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static const char *known[] = {
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"2.5.29.15", /* keyUsage */
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"2.5.29.19", /* basic Constraints */
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"2.5.29.32", /* certificatePolicies */
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NULL
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};
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int rc = 0, i, idx, crit;
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const char *oid;
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KsbaError err;
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for (idx=0; !(err=ksba_cert_get_extension (cert, idx,
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&oid, &crit, NULL, NULL));idx++)
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{
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if (!crit)
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continue;
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for (i=0; known[i] && strcmp (known[i],oid); i++)
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;
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if (!known[i])
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{
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log_error (_("critical certificate extension %s is not supported\n"),
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oid);
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rc = GNUPG_Unsupported_Certificate;
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}
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}
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if (err && err != -1)
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rc = map_ksba_err (err);
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return rc;
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}
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static int
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allowed_ca (KsbaCert cert, int *pathlen)
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{
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KsbaError err;
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int flag;
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err = ksba_cert_is_ca (cert, &flag, pathlen);
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if (err)
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return map_ksba_err (err);
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if (!flag)
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{
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log_error (_("issuer certificate is not marked as a CA\n"));
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return GNUPG_Bad_CA_Certificate;
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}
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return 0;
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}
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/* Return the next certificate up in the chain starting at START.
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Returns -1 when there are no more certificates. */
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int
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gpgsm_walk_cert_chain (KsbaCert start, KsbaCert *r_next)
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{
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int rc = 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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*r_next = 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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issuer = ksba_cert_get_issuer (start, 0);
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subject = ksba_cert_get_subject (start, 0);
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if (!issuer)
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{
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log_error ("no issuer found in certificate\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)
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{
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log_error ("no subject found in certificate\n");
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rc = GNUPG_Bad_Certificate;
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goto leave;
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}
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if (!strcmp (issuer, subject))
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{
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rc = -1; /* we are at the root */
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goto leave;
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}
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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_error ("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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rc = keydb_get_cert (kh, r_next);
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if (rc)
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{
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log_error ("failed to get cert: rc=%d\n", rc);
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rc = GNUPG_General_Error;
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}
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leave:
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xfree (issuer);
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xfree (subject);
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keydb_release (kh);
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return rc;
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}
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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, maxdepth;
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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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time_t current_time = time (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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if (DBG_X509)
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gpgsm_dump_cert ("subject", cert);
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subject_cert = cert;
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maxdepth = 50;
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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, 0);
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subject = ksba_cert_get_subject (subject_cert, 0);
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if (!issuer)
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{
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log_error ("no issuer found in certificate\n");
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rc = GNUPG_Bad_Certificate;
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goto leave;
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}
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{
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time_t not_before, not_after;
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not_before = ksba_cert_get_validity (subject_cert, 0);
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not_after = ksba_cert_get_validity (subject_cert, 1);
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if (not_before == (time_t)(-1) || not_after == (time_t)(-1))
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{
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log_error ("certificate with invalid validity\n");
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rc = GNUPG_Bad_Certificate;
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goto leave;
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}
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if (current_time < not_before)
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{
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log_error ("certificate to young; valid from ");
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gpgsm_dump_time (not_before);
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log_printf ("\n");
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rc = GNUPG_Certificate_Too_Young;
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goto leave;
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}
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if (current_time > not_after)
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{
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log_error ("certificate has expired at ");
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gpgsm_dump_time (not_after);
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log_printf ("\n");
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rc = GNUPG_Certificate_Expired;
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goto leave;
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}
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}
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rc = unknown_criticals (subject_cert);
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if (rc)
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goto leave;
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if (!opt.no_crl_check)
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{
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rc = gpgsm_dirmngr_isvalid (subject_cert);
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if (rc)
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{
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switch (rc)
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{
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case GNUPG_Certificate_Revoked:
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log_error (_("the certificate has been revoked\n"));
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break;
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case GNUPG_No_CRL_Known:
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log_error (_("no CRL found for certificate\n"));
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break;
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case GNUPG_CRL_Too_Old:
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log_error (_("the available CRL is too old\n"));
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log_info (_("please make sure that the "
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"\"dirmngr\" is properly installed\n"));
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break;
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default:
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log_error (_("checking the CRL failed: %s\n"),
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gnupg_strerror (rc));
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break;
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}
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goto leave;
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}
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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_error ("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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rc = allowed_ca (subject_cert, NULL);
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if (rc)
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goto leave;
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rc = gpgsm_agent_istrusted (subject_cert);
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if (!rc)
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;
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else if (rc == GNUPG_Not_Trusted)
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{
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char *fpr = gpgsm_get_fingerprint_string (subject_cert,
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GCRY_MD_SHA1);
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log_error (_("root certificate is not marked trusted\n"));
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log_info (_("fingerprint=%s\n"), fpr? fpr : "?");
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xfree (fpr);
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/* fixme: print a note while we have not yet the code to
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ask whether the cert should be entered into the trust
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list */
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gpgsm_dump_cert ("issuer", subject_cert);
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log_info ("after checking the fingerprint, you may want "
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"to enter it into \"~/.gnupg-test/trustlist.txt\"\n");
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}
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else
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{
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log_error (_("checking the trust list failed: %s\n"),
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gnupg_strerror (rc));
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}
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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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if (depth > maxdepth)
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{
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log_error (_("certificate path too long\n"));
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rc = GNUPG_Bad_Certificate_Path;
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goto leave;
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}
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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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if (rc == -1)
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{
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log_info ("issuer certificate (");
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gpgsm_dump_string (issuer);
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log_printf (") not found\n");
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}
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else
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log_error ("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_error ("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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if (DBG_X509)
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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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}
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if (gpgsm_check_cert_sig (issuer_cert, subject_cert) )
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{
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log_error ("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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{
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int pathlen;
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rc = allowed_ca (issuer_cert, &pathlen);
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if (rc)
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goto leave;
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if (pathlen >= 0 && (depth - 1) > pathlen)
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{
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log_error (_("certificate path longer than allowed by CA (%d)\n"),
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pathlen);
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rc = GNUPG_Bad_Certificate_Path;
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goto leave;
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}
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}
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log_info ("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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if (opt.no_crl_check)
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log_info ("CRL was not checked due to --no-crl-cechk option\n");
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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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/* Check that the given certificate is valid but DO NOT check any
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constraints. We assume that the issuers certificate is already in
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the DB and that this one is valid; which it should be because it
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has been checked using this function. */
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int
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gpgsm_basic_cert_check (KsbaCert cert)
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{
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int rc = 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 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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issuer = ksba_cert_get_issuer (cert, 0);
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subject = ksba_cert_get_subject (cert, 0);
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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 (cert, cert) )
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{
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log_error ("selfsigned certificate has a BAD signatures\n");
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rc = GNUPG_Bad_Certificate;
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goto leave;
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}
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}
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else
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{
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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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if (rc == -1)
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{
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log_info ("issuer certificate (");
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gpgsm_dump_string (issuer);
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log_printf (") not found\n");
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}
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else
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log_error ("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_error ("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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if (gpgsm_check_cert_sig (issuer_cert, cert) )
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{
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log_error ("certificate has a BAD signatures\n");
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rc = GNUPG_Bad_Certificate;
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goto leave;
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}
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if (opt.verbose)
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log_info ("certificate is good\n");
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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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return rc;
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}
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