Implemented X.509 CRL reading using OpenSSL
This commit is contained in:
Martin Willi
parent
5728c6aa7e
commit
6d7eed9a37
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@ -21,7 +21,8 @@ libstrongswan_openssl_la_SOURCES = \
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openssl_ec_diffie_hellman.c openssl_ec_diffie_hellman.h \
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openssl_ec_private_key.c openssl_ec_private_key.h \
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openssl_ec_public_key.c openssl_ec_public_key.h \
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openssl_x509.c openssl_x509.h
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openssl_x509.c openssl_x509.h \
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openssl_crl.c openssl_crl.h
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libstrongswan_openssl_la_LDFLAGS = -module -avoid-version
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libstrongswan_openssl_la_LIBADD = -lcrypto
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@ -0,0 +1,551 @@
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/*
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* Copyright (C) 2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/*
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* Copyright (C) 2010 secunet Security Networks AG
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* Copyright (C) 2010 Thomas Egerer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "openssl_crl.h"
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#include "openssl_util.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <debug.h>
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#include <utils/enumerator.h>
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#include <credentials/certificates/x509.h>
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typedef struct private_openssl_crl_t private_openssl_crl_t;
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/**
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* Private data of an openssl_crl_t object.
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*/
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struct private_openssl_crl_t {
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/**
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* Public openssl_crl_t interface.
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*/
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openssl_crl_t public;
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/**
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* OpenSSL representation of a CRL
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*/
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X509_CRL *crl;
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/**
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* DER encoding of the CRL
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*/
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chunk_t encoding;
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/**
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* Serial Number (crlNumber) of the CRL)
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*/
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chunk_t serial;
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/**
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* AuthorityKeyIdentifier of the issuing CA
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*/
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chunk_t authKeyIdentifier;
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/**
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* Date of this CRL
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*/
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time_t thisUpdate;
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/**
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* Date of next CRL expected
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*/
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time_t nextUpdate;
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/**
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* Issuer of this CRL
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*/
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identification_t *issuer;
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/**
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* Signature scheme used in this CRL
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*/
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signature_scheme_t scheme;
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/**
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* References to this CRL
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*/
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refcount_t ref;
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};
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/**
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* Enumerator over revoked certificates
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*/
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typedef struct {
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/**
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* Implements enumerator_t
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*/
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enumerator_t public;
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/**
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* stack of revoked certificates
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*/
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STACK_OF(X509_REVOKED) *stack;
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/**
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* Total number of revoked certificates
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*/
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int num;
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/**
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* Current position of enumerator
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*/
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int i;
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} crl_enumerator_t;
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METHOD(enumerator_t, crl_enumerate, bool,
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crl_enumerator_t *this, chunk_t *serial, time_t *date, crl_reason_t *reason)
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{
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if (this->i < this->num)
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{
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X509_REVOKED *revoked;
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ASN1_ENUMERATED *crlrsn;
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revoked = sk_X509_REVOKED_value(this->stack, this->i);
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if (serial)
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{
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*serial = openssl_asn1_str2chunk(revoked->serialNumber);
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}
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if (date)
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{
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*date = openssl_asn1_to_time(revoked->revocationDate);
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}
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if (reason)
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{
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*reason = CRL_REASON_UNSPECIFIED;
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crlrsn = X509_REVOKED_get_ext_d2i(revoked, NID_crl_reason,
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NULL, NULL);
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if (crlrsn)
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{
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if (ASN1_STRING_type(crlrsn) == V_ASN1_ENUMERATED &&
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ASN1_STRING_length(crlrsn) == 1)
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{
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*reason = *ASN1_STRING_data(crlrsn);
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}
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ASN1_STRING_free(crlrsn);
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}
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}
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this->i++;
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return TRUE;
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}
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return FALSE;
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}
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METHOD(crl_t, create_enumerator, enumerator_t*,
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private_openssl_crl_t *this)
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{
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crl_enumerator_t *enumerator;
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INIT(enumerator,
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.public = {
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.enumerate = (void*)_crl_enumerate,
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.destroy = (void*)free,
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},
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.stack = X509_CRL_get_REVOKED(this->crl),
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);
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if (!enumerator->stack)
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{
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free(enumerator);
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return enumerator_create_empty();
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}
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enumerator->num = sk_X509_EXTENSION_num(enumerator->stack);
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return &enumerator->public;
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}
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METHOD(crl_t, get_serial, chunk_t,
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private_openssl_crl_t *this)
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{
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return this->serial;
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}
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METHOD(crl_t, get_authKeyIdentifier, chunk_t,
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private_openssl_crl_t *this)
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{
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return this->authKeyIdentifier;
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}
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METHOD(certificate_t, get_type, certificate_type_t,
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private_openssl_crl_t *this)
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{
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return CERT_X509_CRL;
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}
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METHOD(certificate_t, get_subject_or_issuer, identification_t*,
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private_openssl_crl_t *this)
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{
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return this->issuer;
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}
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METHOD(certificate_t, has_subject_or_issuer, id_match_t,
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private_openssl_crl_t *this, identification_t *id)
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{
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if (id->get_type(id) == ID_KEY_ID &&
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chunk_equals(this->authKeyIdentifier, id->get_encoding(id)))
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{
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return ID_MATCH_PERFECT;
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}
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return this->issuer->matches(this->issuer, id);
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}
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METHOD(certificate_t, issued_by, bool,
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private_openssl_crl_t *this, certificate_t *issuer)
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{
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chunk_t fingerprint, tbs;
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public_key_t *key;
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x509_t *x509;
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bool valid;
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if (issuer->get_type(issuer) != CERT_X509)
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{
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return FALSE;
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}
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x509 = (x509_t*)issuer;
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if (!(x509->get_flags(x509) & X509_CA))
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{
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return FALSE;
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}
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key = issuer->get_public_key(issuer);
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if (!key)
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{
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return FALSE;
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}
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if (this->authKeyIdentifier.ptr && key)
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{
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if (!key->get_fingerprint(key, KEY_ID_PUBKEY_SHA1, &fingerprint) ||
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!chunk_equals(fingerprint, this->authKeyIdentifier))
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{
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return FALSE;
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}
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}
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else
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{
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if (!this->issuer->equals(this->issuer, issuer->get_subject(issuer)))
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{
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return FALSE;
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}
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}
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if (this->scheme == SIGN_UNKNOWN)
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{
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return FALSE;
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}
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tbs = openssl_i2chunk(X509_CRL_INFO, this->crl->crl);
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valid = key->verify(key, this->scheme, tbs,
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openssl_asn1_str2chunk(this->crl->signature));
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free(tbs.ptr);
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key->destroy(key);
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return valid;
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}
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METHOD(certificate_t, get_public_key, public_key_t*,
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private_openssl_crl_t *this)
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{
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return NULL;
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}
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METHOD(certificate_t, get_validity, bool,
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private_openssl_crl_t *this,
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time_t *when, time_t *not_before, time_t *not_after)
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{
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time_t t = when ? *when : time(NULL);
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if (not_before)
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{
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*not_before = this->thisUpdate;
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}
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if (not_after)
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{
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*not_after = this->nextUpdate;
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}
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return t <= this->nextUpdate;
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}
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METHOD(certificate_t, is_newer, bool,
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private_openssl_crl_t *this, certificate_t *other)
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{
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time_t this_update, that_update;
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chunk_t other_serial;
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x509_t *x509;
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bool new;
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x509 = (x509_t*)other;
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other_serial = x509->get_serial(x509);
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if (this->serial.ptr != NULL && other_serial.ptr != NULL)
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{ /* compare crlNumbers if available */
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new = chunk_compare(this->serial, other_serial) > 0;
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DBG1(DBG_LIB, " crl #%#B is %s - existing crl #%#B %s",
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&this->serial, new ? "newer":"not newer",
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&other_serial, new ? "replaced":"retained");
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}
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else
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{ /* otherwise use thisUpdate */
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get_validity(this, NULL, &this_update, NULL);
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other->get_validity(other, NULL, &that_update, NULL);
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new = this_update > that_update;
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DBG1(DBG_LIB, " crl from %T is %s - existing crl from %T %s",
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&this_update, FALSE, new ? "newer":"not newer",
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&that_update, FALSE, new ? "replaced":"retained");
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}
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return new;
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}
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METHOD(certificate_t, get_encoding, chunk_t,
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private_openssl_crl_t *this)
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{
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return chunk_clone(this->encoding);
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}
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METHOD(certificate_t, equals, bool,
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private_openssl_crl_t *this, certificate_t *other)
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{
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chunk_t encoding;
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bool equal;
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if (&this->public.crl.certificate == other)
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{
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return TRUE;
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}
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if (other->equals == (void*)equals)
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{ /* skip allocation if we have the same implementation */
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return chunk_equals(this->encoding,
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((private_openssl_crl_t*)other)->encoding);
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}
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encoding = other->get_encoding(other);
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equal = chunk_equals(this->encoding, encoding);
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free(encoding.ptr);
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return equal;
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}
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METHOD(certificate_t, get_ref, certificate_t*,
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private_openssl_crl_t *this)
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{
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ref_get(&this->ref);
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return &this->public.crl.certificate;
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}
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METHOD(certificate_t, destroy, void,
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private_openssl_crl_t *this)
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{
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if (ref_put(&this->ref))
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{
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if (this->crl)
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{
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X509_CRL_free(this->crl);
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}
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DESTROY_IF(this->issuer);
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free(this->authKeyIdentifier.ptr);
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free(this->serial.ptr);
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free(this->encoding.ptr);
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free(this);
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}
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}
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/**
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* Create an empty CRL.
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*/
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static private_openssl_crl_t *create_empty()
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{
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private_openssl_crl_t *this;
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INIT(this,
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.public = {
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.crl = {
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.certificate = {
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.get_type = _get_type,
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.get_subject = _get_subject_or_issuer,
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.get_issuer = _get_subject_or_issuer,
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.has_subject = _has_subject_or_issuer,
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.has_issuer = _has_subject_or_issuer,
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.issued_by = _issued_by,
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.get_public_key = _get_public_key,
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.get_validity = _get_validity,
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.is_newer = _is_newer,
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.get_encoding = _get_encoding,
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.equals = _equals,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.get_serial = _get_serial,
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.get_authKeyIdentifier = _get_authKeyIdentifier,
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.create_enumerator = _create_enumerator,
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},
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},
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.ref = 1,
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);
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return this;
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}
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/**
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* Parse the authKeyIdentifier extension
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*/
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static bool parse_authKeyIdentifier_ext(private_openssl_crl_t *this,
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X509_EXTENSION *ext)
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{
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AUTHORITY_KEYID *keyid;
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keyid = (AUTHORITY_KEYID *)X509V3_EXT_d2i(ext);
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if (keyid)
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{
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free(this->authKeyIdentifier.ptr);
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this->authKeyIdentifier = chunk_clone(
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openssl_asn1_str2chunk(keyid->keyid));
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AUTHORITY_KEYID_free(keyid);
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Parse the crlNumber extension
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*/
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static bool parse_crlNumber_ext(private_openssl_crl_t *this,
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X509_EXTENSION *ext)
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{
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free(this->serial.ptr);
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this->serial = chunk_clone(
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openssl_asn1_str2chunk(X509_EXTENSION_get_data(ext)));
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return this->serial.len != 0;
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}
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/**
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* Parse X509 CRL extensions
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*/
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static bool parse_extensions(private_openssl_crl_t *this)
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{
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bool ok;
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int i, num;
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X509_EXTENSION *ext;
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STACK_OF(X509_EXTENSION) *extensions;
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extensions = this->crl->crl->extensions;
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if (extensions)
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{
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num = sk_X509_EXTENSION_num(extensions);
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for (i = 0; i < num; ++i)
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{
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ext = sk_X509_EXTENSION_value(extensions, i);
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switch (OBJ_obj2nid(X509_EXTENSION_get_object(ext)))
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{
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case NID_authority_key_identifier:
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ok = parse_authKeyIdentifier_ext(this, ext);
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break;
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case NID_crl_number:
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ok = parse_crlNumber_ext(this, ext);
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break;
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default:
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ok = TRUE;
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break;
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}
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if (!ok)
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{
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return FALSE;
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}
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}
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}
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return TRUE;
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}
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/**
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* Parse a X509 CRL
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*/
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static bool parse_crl(private_openssl_crl_t *this)
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{
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const unsigned char *ptr = this->encoding.ptr;
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this->crl = d2i_X509_CRL(NULL, &ptr, this->encoding.len);
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if (!this->crl)
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{
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return FALSE;
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}
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if (!chunk_equals(
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openssl_asn1_obj2chunk(this->crl->crl->sig_alg->algorithm),
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openssl_asn1_obj2chunk(this->crl->sig_alg->algorithm)))
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{
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return FALSE;
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}
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this->scheme = signature_scheme_from_oid(openssl_asn1_known_oid(
|
||||
this->crl->sig_alg->algorithm));
|
||||
|
||||
this->issuer = openssl_x509_name2id(X509_CRL_get_issuer(this->crl));
|
||||
if (!this->issuer)
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
this->thisUpdate = openssl_asn1_to_time(X509_CRL_get_lastUpdate(this->crl));
|
||||
this->nextUpdate = openssl_asn1_to_time(X509_CRL_get_nextUpdate(this->crl));
|
||||
|
||||
return parse_extensions(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* Load the CRL.
|
||||
*/
|
||||
openssl_crl_t *openssl_crl_load(certificate_type_t type, va_list args)
|
||||
{
|
||||
chunk_t blob = chunk_empty;
|
||||
|
||||
while (TRUE)
|
||||
{
|
||||
switch (va_arg(args, builder_part_t))
|
||||
{
|
||||
case BUILD_BLOB_ASN1_DER:
|
||||
blob = va_arg(args, chunk_t);
|
||||
continue;
|
||||
case BUILD_END:
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
break;
|
||||
}
|
||||
if (blob.ptr)
|
||||
{
|
||||
private_openssl_crl_t *this = create_empty();
|
||||
|
||||
this->encoding = chunk_clone(blob);
|
||||
if (parse_crl(this))
|
||||
{
|
||||
return &this->public;
|
||||
}
|
||||
destroy(this);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
|
@ -0,0 +1,48 @@
|
|||
/*
|
||||
* Copyright (C) 2010 Martin Willi
|
||||
* Copyright (C) 2010 revosec AG
|
||||
*
|
||||
* This program 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. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program 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.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup openssl_crl openssl_crl
|
||||
* @{ @ingroup openssl_p
|
||||
*/
|
||||
|
||||
#ifndef OPENSSL_CRL_H_
|
||||
#define OPENSSL_CRL_H_
|
||||
|
||||
typedef struct openssl_crl_t openssl_crl_t;
|
||||
|
||||
#include <credentials/certificates/crl.h>
|
||||
|
||||
/**
|
||||
* X.509 Certificate Revocation list implemented with OpenSSL.
|
||||
*/
|
||||
struct openssl_crl_t {
|
||||
|
||||
/**
|
||||
* Implements the crl_t interface.
|
||||
*/
|
||||
crl_t crl;
|
||||
};
|
||||
|
||||
/**
|
||||
* Load a X.509 CRL using OpenSSL.
|
||||
*
|
||||
* @param type certificate type, CERT_X509_CRL only
|
||||
* @param args builder_part_t argument list
|
||||
* @return X.509 CRL, NULL on failure
|
||||
*/
|
||||
openssl_crl_t *openssl_crl_load(certificate_type_t type, va_list args);
|
||||
|
||||
#endif /** OPENSSL_CRL_H_ @}*/
|
||||
|
|
@ -35,6 +35,7 @@
|
|||
#include "openssl_ec_private_key.h"
|
||||
#include "openssl_ec_public_key.h"
|
||||
#include "openssl_x509.h"
|
||||
#include "openssl_crl.h"
|
||||
|
||||
typedef struct private_openssl_plugin_t private_openssl_plugin_t;
|
||||
|
||||
|
|
@ -194,6 +195,8 @@ static void destroy(private_openssl_plugin_t *this)
|
|||
(builder_function_t)openssl_ec_public_key_load);
|
||||
lib->creds->remove_builder(lib->creds,
|
||||
(builder_function_t)openssl_x509_load);
|
||||
lib->creds->remove_builder(lib->creds,
|
||||
(builder_function_t)openssl_crl_load);
|
||||
|
||||
ENGINE_cleanup();
|
||||
EVP_cleanup();
|
||||
|
|
@ -323,6 +326,8 @@ plugin_t *openssl_plugin_create()
|
|||
/* X509 certificates */
|
||||
lib->creds->add_builder(lib->creds, CRED_CERTIFICATE, CERT_X509,
|
||||
(builder_function_t)openssl_x509_load);
|
||||
lib->creds->add_builder(lib->creds, CRED_CERTIFICATE, CERT_X509_CRL,
|
||||
(builder_function_t)openssl_crl_load);
|
||||
|
||||
return &this->public.plugin;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue