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![Werner Koch](/assets/img/avatar_default.png)
* sm/gpgsm.h (MAX_FINGERPRINT_LEN): New. * sm/keydb.c (struct keydb_local_s): Change definition of search_result. (keydb_get_cert): Implement keyboxd mode. (keydb_get_flags): Temporary hack for keyboxd mode. Needs to be fixed. (struct store_parm_s, store_inq_cb): New. (keydb_insert_cert): Implement keyboxd mode. (keydb_locate_writable): Make static. (keydb_search_reset): Implement keyboxd mode. (search_status_cb): New. (keydb_search): Implement keyboxd mode. Replace return code -1 by GPG_ERR_NOT_FOUND. (keydb_set_cert_flags): Replace return code -1 by GPG_ERR_NOT_FOUND. * sm/keylist.c (list_cert_colon): Adjust for replacement of -1 by GPG_ERR_NOT_FOUND. (list_internal_keys): Ditto. * sm/sign.c (add_certificate_list): Ditto. * sm/certchain.c (find_up_search_by_keyid): Ditto. (find_up_external, find_up, find_up_dirmngr): Ditto. (gpgsm_walk_cert_chain): Ditto. (get_regtp_ca_info): Ditto. * sm/certlist.c (gpgsm_add_to_certlist): Ditto. (gpgsm_find_cert): Ditto. * sm/delete.c (delete_one): Ditto. * sm/export.c (gpgsm_export): Ditto. (gpgsm_p12_export): Ditto. * sm/import.c (gpgsm_import_files): Ditto. -- Note that keyboxd is not yet able to handle the ephemeral flag. This needs fixing here and in keyboxd. Delete et al. is also not yet implemented. A basic key listing works, though. Signed-off-by: Werner Koch <wk@gnupg.org>
610 lines
19 KiB
C
610 lines
19 KiB
C
/* certlist.c - build list of certificates
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* Copyright (C) 2001, 2003, 2004, 2005, 2007,
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* 2008, 2011 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 3 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, see <https://www.gnu.org/licenses/>.
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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 "gpgsm.h"
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#include <gcrypt.h>
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#include <ksba.h>
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#include "keydb.h"
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#include "../common/i18n.h"
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static const char oid_kp_serverAuth[] = "1.3.6.1.5.5.7.3.1";
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static const char oid_kp_clientAuth[] = "1.3.6.1.5.5.7.3.2";
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static const char oid_kp_codeSigning[] = "1.3.6.1.5.5.7.3.3";
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static const char oid_kp_emailProtection[]= "1.3.6.1.5.5.7.3.4";
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static const char oid_kp_timeStamping[] = "1.3.6.1.5.5.7.3.8";
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static const char oid_kp_ocspSigning[] = "1.3.6.1.5.5.7.3.9";
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/* Return 0 if the cert is usable for encryption. A MODE of 0 checks
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for signing a MODE of 1 checks for encryption, a MODE of 2 checks
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for verification and a MODE of 3 for decryption (just for
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debugging). MODE 4 is for certificate signing, MODE for COSP
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response signing. */
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static int
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cert_usage_p (ksba_cert_t cert, int mode, int silent)
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{
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gpg_error_t err;
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unsigned int use;
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char *extkeyusages;
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int have_ocsp_signing = 0;
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err = ksba_cert_get_ext_key_usages (cert, &extkeyusages);
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if (gpg_err_code (err) == GPG_ERR_NO_DATA)
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err = 0; /* no policy given */
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if (!err)
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{
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unsigned int extusemask = ~0; /* Allow all. */
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if (extkeyusages)
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{
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char *p, *pend;
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int any_critical = 0;
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extusemask = 0;
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p = extkeyusages;
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while (p && (pend=strchr (p, ':')))
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{
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*pend++ = 0;
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/* Only care about critical flagged usages. */
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if ( *pend == 'C' )
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{
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any_critical = 1;
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if ( !strcmp (p, oid_kp_serverAuth))
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extusemask |= (KSBA_KEYUSAGE_DIGITAL_SIGNATURE
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| KSBA_KEYUSAGE_KEY_ENCIPHERMENT
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| KSBA_KEYUSAGE_KEY_AGREEMENT);
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else if ( !strcmp (p, oid_kp_clientAuth))
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extusemask |= (KSBA_KEYUSAGE_DIGITAL_SIGNATURE
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| KSBA_KEYUSAGE_KEY_AGREEMENT);
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else if ( !strcmp (p, oid_kp_codeSigning))
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extusemask |= (KSBA_KEYUSAGE_DIGITAL_SIGNATURE);
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else if ( !strcmp (p, oid_kp_emailProtection))
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extusemask |= (KSBA_KEYUSAGE_DIGITAL_SIGNATURE
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| KSBA_KEYUSAGE_NON_REPUDIATION
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| KSBA_KEYUSAGE_KEY_ENCIPHERMENT
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| KSBA_KEYUSAGE_KEY_AGREEMENT);
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else if ( !strcmp (p, oid_kp_timeStamping))
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extusemask |= (KSBA_KEYUSAGE_DIGITAL_SIGNATURE
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| KSBA_KEYUSAGE_NON_REPUDIATION);
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}
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/* This is a hack to cope with OCSP. Note that we do
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not yet fully comply with the requirements and that
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the entire CRL/OCSP checking thing should undergo a
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thorough review and probably redesign. */
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if ( !strcmp (p, oid_kp_ocspSigning))
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have_ocsp_signing = 1;
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if ((p = strchr (pend, '\n')))
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p++;
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}
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xfree (extkeyusages);
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extkeyusages = NULL;
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if (!any_critical)
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extusemask = ~0; /* Reset to the don't care mask. */
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}
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err = ksba_cert_get_key_usage (cert, &use);
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if (gpg_err_code (err) == GPG_ERR_NO_DATA)
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{
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err = 0;
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if (opt.verbose && mode < 2 && !silent)
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log_info (_("no key usage specified - assuming all usages\n"));
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use = ~0;
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}
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/* Apply extKeyUsage. */
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use &= extusemask;
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}
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if (err)
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{
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log_error (_("error getting key usage information: %s\n"),
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gpg_strerror (err));
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xfree (extkeyusages);
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return err;
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}
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if (mode == 4)
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{
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if ((use & (KSBA_KEYUSAGE_KEY_CERT_SIGN)))
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return 0;
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if (!silent)
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log_info (_("certificate should not have "
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"been used for certification\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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if (mode == 5)
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{
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if (use != ~0
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&& (have_ocsp_signing
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|| (use & (KSBA_KEYUSAGE_KEY_CERT_SIGN
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|KSBA_KEYUSAGE_CRL_SIGN))))
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return 0;
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if (!silent)
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log_info (_("certificate should not have "
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"been used for OCSP response signing\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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if ((use & ((mode&1)?
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(KSBA_KEYUSAGE_KEY_ENCIPHERMENT|KSBA_KEYUSAGE_DATA_ENCIPHERMENT):
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(KSBA_KEYUSAGE_DIGITAL_SIGNATURE|KSBA_KEYUSAGE_NON_REPUDIATION)))
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)
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return 0;
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if (!silent)
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log_info
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(mode==3? _("certificate should not have been used for encryption\n"):
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mode==2? _("certificate should not have been used for signing\n"):
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mode==1? _("certificate is not usable for encryption\n"):
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/**/ _("certificate is not usable for signing\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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/* Return 0 if the cert is usable for signing */
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int
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gpgsm_cert_use_sign_p (ksba_cert_t cert, int silent)
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{
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return cert_usage_p (cert, 0, silent);
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}
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/* Return 0 if the cert is usable for encryption */
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int
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gpgsm_cert_use_encrypt_p (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 1, 0);
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}
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int
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gpgsm_cert_use_verify_p (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 2, 0);
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}
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int
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gpgsm_cert_use_decrypt_p (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 3, 0);
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}
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int
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gpgsm_cert_use_cert_p (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 4, 0);
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}
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int
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gpgsm_cert_use_ocsp_p (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 5, 0);
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}
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/* Return true if CERT has the well known private key extension. */
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int
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gpgsm_cert_has_well_known_private_key (ksba_cert_t cert)
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{
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int idx;
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const char *oid;
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for (idx=0; !ksba_cert_get_extension (cert, idx,
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&oid, NULL, NULL, NULL);idx++)
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if (!strcmp (oid, "1.3.6.1.4.1.11591.2.2.2") )
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return 1; /* Yes. */
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return 0; /* No. */
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}
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static int
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same_subject_issuer (const char *subject, const char *issuer, ksba_cert_t cert)
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{
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char *subject2 = ksba_cert_get_subject (cert, 0);
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char *issuer2 = ksba_cert_get_issuer (cert, 0);
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int tmp;
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tmp = (subject && subject2
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&& !strcmp (subject, subject2)
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&& issuer && issuer2
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&& !strcmp (issuer, issuer2));
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xfree (subject2);
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xfree (issuer2);
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return tmp;
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}
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/* Return true if CERT_A is the same as CERT_B. */
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int
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gpgsm_certs_identical_p (ksba_cert_t cert_a, ksba_cert_t cert_b)
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{
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const unsigned char *img_a, *img_b;
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size_t len_a, len_b;
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img_a = ksba_cert_get_image (cert_a, &len_a);
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if (img_a)
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{
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img_b = ksba_cert_get_image (cert_b, &len_b);
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if (img_b && len_a == len_b && !memcmp (img_a, img_b, len_a))
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return 1; /* Identical. */
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}
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return 0;
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}
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/* Return true if CERT is already contained in CERTLIST. */
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static int
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is_cert_in_certlist (ksba_cert_t cert, certlist_t certlist)
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{
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const unsigned char *img_a, *img_b;
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size_t len_a, len_b;
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img_a = ksba_cert_get_image (cert, &len_a);
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if (img_a)
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{
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for ( ; certlist; certlist = certlist->next)
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{
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img_b = ksba_cert_get_image (certlist->cert, &len_b);
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if (img_b && len_a == len_b && !memcmp (img_a, img_b, len_a))
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return 1; /* Already contained. */
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}
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}
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return 0;
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}
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/* Add CERT to the list of certificates at CERTADDR but avoid
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duplicates. */
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int
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gpgsm_add_cert_to_certlist (ctrl_t ctrl, ksba_cert_t cert,
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certlist_t *listaddr, int is_encrypt_to)
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{
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(void)ctrl;
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if (!is_cert_in_certlist (cert, *listaddr))
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{
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certlist_t cl = xtrycalloc (1, sizeof *cl);
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if (!cl)
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return out_of_core ();
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cl->cert = cert;
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ksba_cert_ref (cert);
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cl->next = *listaddr;
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cl->is_encrypt_to = is_encrypt_to;
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*listaddr = cl;
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}
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return 0;
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}
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/* Add a certificate to a list of certificate and make sure that it is
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a valid certificate. With SECRET set to true a secret key must be
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available for the certificate. IS_ENCRYPT_TO sets the corresponding
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flag in the new create LISTADDR item. */
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int
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gpgsm_add_to_certlist (ctrl_t ctrl, const char *name, int secret,
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certlist_t *listaddr, int is_encrypt_to)
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{
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int rc;
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KEYDB_SEARCH_DESC desc;
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KEYDB_HANDLE kh = NULL;
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ksba_cert_t cert = NULL;
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rc = classify_user_id (name, &desc, 0);
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if (!rc)
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{
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kh = keydb_new (ctrl);
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if (!kh)
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rc = gpg_error (GPG_ERR_ENOMEM);
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else
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{
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int wrong_usage = 0;
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char *first_subject = NULL;
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char *first_issuer = NULL;
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get_next:
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rc = keydb_search (ctrl, kh, &desc, 1);
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if (!rc)
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rc = keydb_get_cert (kh, &cert);
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if (!rc)
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{
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if (!first_subject)
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{
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/* Save the subject and the issuer for key usage
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and ambiguous name tests. */
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first_subject = ksba_cert_get_subject (cert, 0);
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first_issuer = ksba_cert_get_issuer (cert, 0);
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}
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rc = secret? gpgsm_cert_use_sign_p (cert, 0)
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: gpgsm_cert_use_encrypt_p (cert);
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if (gpg_err_code (rc) == GPG_ERR_WRONG_KEY_USAGE)
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{
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/* There might be another certificate with the
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correct usage, so we try again */
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if (!wrong_usage
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|| same_subject_issuer (first_subject, first_issuer,cert))
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{
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if (!wrong_usage)
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wrong_usage = rc; /* save error of the first match */
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ksba_cert_release (cert);
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cert = NULL;
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log_info (_("looking for another certificate\n"));
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goto get_next;
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}
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else
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wrong_usage = rc;
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}
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}
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/* We want the error code from the first match in this case. */
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if (rc && wrong_usage)
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rc = wrong_usage;
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if (!rc)
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{
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certlist_t dup_certs = NULL;
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next_ambigious:
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rc = keydb_search (ctrl, kh, &desc, 1);
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if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
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rc = 0;
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else if (!rc)
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{
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ksba_cert_t cert2 = NULL;
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/* If this is the first possible duplicate, add the original
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certificate to our list of duplicates. */
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if (!dup_certs)
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gpgsm_add_cert_to_certlist (ctrl, cert, &dup_certs, 0);
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/* We have to ignore ambiguous names as long as
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there only fault is a bad key usage. This is
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required to support encryption and signing
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certificates of the same subject.
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Further we ignore them if they are due to an
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identical certificate (which may happen if a
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certificate is accidentally duplicated in the
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keybox). */
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if (!keydb_get_cert (kh, &cert2))
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{
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int tmp = (same_subject_issuer (first_subject,
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first_issuer,
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cert2)
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&& ((gpg_err_code (
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secret? gpgsm_cert_use_sign_p (cert2,0)
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: gpgsm_cert_use_encrypt_p (cert2)
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)
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) == GPG_ERR_WRONG_KEY_USAGE));
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if (tmp)
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gpgsm_add_cert_to_certlist (ctrl, cert2,
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&dup_certs, 0);
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else
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{
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if (is_cert_in_certlist (cert2, dup_certs))
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tmp = 1;
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}
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ksba_cert_release (cert2);
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if (tmp)
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goto next_ambigious;
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}
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rc = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
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}
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gpgsm_release_certlist (dup_certs);
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}
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xfree (first_subject);
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xfree (first_issuer);
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first_subject = NULL;
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first_issuer = NULL;
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if (!rc && !is_cert_in_certlist (cert, *listaddr))
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{
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if (!rc && secret)
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{
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char *p;
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rc = gpg_error (GPG_ERR_NO_SECKEY);
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p = gpgsm_get_keygrip_hexstring (cert);
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if (p)
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{
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if (!gpgsm_agent_havekey (ctrl, p))
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rc = 0;
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xfree (p);
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}
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}
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if (!rc)
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rc = gpgsm_validate_chain (ctrl, cert, "", NULL,
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0, NULL, 0, NULL);
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if (!rc)
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{
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certlist_t cl = xtrycalloc (1, sizeof *cl);
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if (!cl)
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rc = gpg_error_from_syserror ();
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else
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{
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cl->cert = cert; cert = NULL;
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cl->next = *listaddr;
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cl->is_encrypt_to = is_encrypt_to;
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*listaddr = cl;
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}
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}
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}
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}
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}
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keydb_release (kh);
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ksba_cert_release (cert);
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return (gpg_err_code (rc) == GPG_ERR_NOT_FOUND
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? gpg_error (GPG_ERR_NO_PUBKEY): rc);
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}
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void
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gpgsm_release_certlist (certlist_t list)
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{
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while (list)
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{
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certlist_t cl = list->next;
|
||
ksba_cert_release (list->cert);
|
||
xfree (list);
|
||
list = cl;
|
||
}
|
||
}
|
||
|
||
|
||
/* Like gpgsm_add_to_certlist, but look only for one certificate. No
|
||
chain validation is done. If KEYID is not NULL it is taken as an
|
||
additional filter value which must match the
|
||
subjectKeyIdentifier. */
|
||
int
|
||
gpgsm_find_cert (ctrl_t ctrl,
|
||
const char *name, ksba_sexp_t keyid, ksba_cert_t *r_cert,
|
||
int allow_ambiguous)
|
||
{
|
||
int rc;
|
||
KEYDB_SEARCH_DESC desc;
|
||
KEYDB_HANDLE kh = NULL;
|
||
|
||
*r_cert = NULL;
|
||
rc = classify_user_id (name, &desc, 0);
|
||
if (!rc)
|
||
{
|
||
kh = keydb_new (ctrl);
|
||
if (!kh)
|
||
rc = gpg_error (GPG_ERR_ENOMEM);
|
||
else
|
||
{
|
||
nextone:
|
||
rc = keydb_search (ctrl, kh, &desc, 1);
|
||
if (!rc)
|
||
{
|
||
rc = keydb_get_cert (kh, r_cert);
|
||
if (!rc && keyid)
|
||
{
|
||
ksba_sexp_t subj;
|
||
|
||
rc = ksba_cert_get_subj_key_id (*r_cert, NULL, &subj);
|
||
if (!rc)
|
||
{
|
||
if (cmp_simple_canon_sexp (keyid, subj))
|
||
{
|
||
xfree (subj);
|
||
goto nextone;
|
||
}
|
||
xfree (subj);
|
||
/* Okay: Here we know that the certificate's
|
||
subjectKeyIdentifier matches the requested
|
||
one. */
|
||
}
|
||
else if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
|
||
goto nextone;
|
||
}
|
||
}
|
||
|
||
/* If we don't have the KEYID filter we need to check for
|
||
ambiguous search results. Note, that it is somewhat
|
||
reasonable to assume that a specification of a KEYID
|
||
won't lead to ambiguous names. */
|
||
if (!rc && !keyid)
|
||
{
|
||
ksba_isotime_t notbefore = "";
|
||
const unsigned char *image = NULL;
|
||
size_t length = 0;
|
||
if (allow_ambiguous)
|
||
{
|
||
/* We want to return the newest certificate */
|
||
if (ksba_cert_get_validity (*r_cert, 0, notbefore))
|
||
*notbefore = '\0';
|
||
image = ksba_cert_get_image (*r_cert, &length);
|
||
}
|
||
next_ambiguous:
|
||
rc = keydb_search (ctrl, kh, &desc, 1);
|
||
if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
|
||
rc = 0;
|
||
else
|
||
{
|
||
if (!rc)
|
||
{
|
||
ksba_cert_t cert2 = NULL;
|
||
ksba_isotime_t notbefore2 = "";
|
||
const unsigned char *image2 = NULL;
|
||
size_t length2 = 0;
|
||
int cmp = 0;
|
||
|
||
if (!keydb_get_cert (kh, &cert2))
|
||
{
|
||
if (gpgsm_certs_identical_p (*r_cert, cert2))
|
||
{
|
||
ksba_cert_release (cert2);
|
||
goto next_ambiguous;
|
||
}
|
||
if (allow_ambiguous)
|
||
{
|
||
if (ksba_cert_get_validity (cert2, 0, notbefore2))
|
||
*notbefore2 = '\0';
|
||
image2 = ksba_cert_get_image (cert2, &length2);
|
||
cmp = strcmp (notbefore, notbefore2);
|
||
/* use certificate image bits as last resort for stable ordering */
|
||
if (!cmp)
|
||
cmp = memcmp (image, image2, length < length2 ? length : length2);
|
||
if (!cmp)
|
||
cmp = length < length2 ? -1 : length > length2 ? 1 : 0;
|
||
if (cmp < 0)
|
||
{
|
||
ksba_cert_release (*r_cert);
|
||
*r_cert = cert2;
|
||
strcpy (notbefore, notbefore2);
|
||
image = image2;
|
||
length = length2;
|
||
}
|
||
else
|
||
ksba_cert_release (cert2);
|
||
goto next_ambiguous;
|
||
}
|
||
ksba_cert_release (cert2);
|
||
}
|
||
rc = gpg_error (GPG_ERR_AMBIGUOUS_NAME);
|
||
}
|
||
ksba_cert_release (*r_cert);
|
||
*r_cert = NULL;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
keydb_release (kh);
|
||
return (gpg_err_code (rc) == GPG_ERR_NOT_FOUND?
|
||
gpg_error (GPG_ERR_NO_PUBKEY): rc);
|
||
}
|