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396 lines
11 KiB
C
396 lines
11 KiB
C
/*
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* Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <time.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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#include <openssl/x509v3.h>
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#include <openssl/ocsp.h>
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#include "ocsp_local.h"
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/*
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* Utility functions related to sending OCSP requests and extracting relevant
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* information from the response.
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*/
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/*
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* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
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* useful if we want to add extensions.
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*/
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OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
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{
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OCSP_ONEREQ *one = NULL;
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if ((one = OCSP_ONEREQ_new()) == NULL)
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return NULL;
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OCSP_CERTID_free(one->reqCert);
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one->reqCert = cid;
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if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one)) {
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one->reqCert = NULL; /* do not free on error */
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goto err;
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}
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return one;
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err:
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OCSP_ONEREQ_free(one);
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return NULL;
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}
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/* Set requestorName from an X509_NAME structure */
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int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
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{
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GENERAL_NAME *gen;
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gen = GENERAL_NAME_new();
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if (gen == NULL)
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return 0;
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if (!X509_NAME_set(&gen->d.directoryName, nm)) {
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GENERAL_NAME_free(gen);
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return 0;
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}
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gen->type = GEN_DIRNAME;
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GENERAL_NAME_free(req->tbsRequest.requestorName);
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req->tbsRequest.requestorName = gen;
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return 1;
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}
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/* Add a certificate to an OCSP request */
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int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
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{
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OCSP_SIGNATURE *sig;
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if (req->optionalSignature == NULL)
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req->optionalSignature = OCSP_SIGNATURE_new();
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sig = req->optionalSignature;
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if (sig == NULL)
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return 0;
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if (cert == NULL)
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return 1;
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if (sig->certs == NULL
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&& (sig->certs = sk_X509_new_null()) == NULL)
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return 0;
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if (!sk_X509_push(sig->certs, cert))
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return 0;
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X509_up_ref(cert);
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return 1;
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}
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/*
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* Sign an OCSP request set the requestorName to the subject name of an
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* optional signers certificate and include one or more optional certificates
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* in the request. Behaves like PKCS7_sign().
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*/
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int OCSP_request_sign(OCSP_REQUEST *req,
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X509 *signer,
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EVP_PKEY *key,
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const EVP_MD *dgst,
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STACK_OF(X509) *certs, unsigned long flags)
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{
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int i;
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X509 *x;
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if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
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goto err;
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if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
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goto err;
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if (key) {
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if (!X509_check_private_key(signer, key)) {
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OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
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OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
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goto err;
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}
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if (!OCSP_REQUEST_sign(req, key, dgst))
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goto err;
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}
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if (!(flags & OCSP_NOCERTS)) {
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if (!OCSP_request_add1_cert(req, signer))
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goto err;
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for (i = 0; i < sk_X509_num(certs); i++) {
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x = sk_X509_value(certs, i);
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if (!OCSP_request_add1_cert(req, x))
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goto err;
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}
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}
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return 1;
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err:
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OCSP_SIGNATURE_free(req->optionalSignature);
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req->optionalSignature = NULL;
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return 0;
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}
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/* Get response status */
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int OCSP_response_status(OCSP_RESPONSE *resp)
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{
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return ASN1_ENUMERATED_get(resp->responseStatus);
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}
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/*
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* Extract basic response from OCSP_RESPONSE or NULL if no basic response
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* present.
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*/
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OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
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{
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OCSP_RESPBYTES *rb;
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rb = resp->responseBytes;
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if (!rb) {
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OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
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return NULL;
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}
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if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
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OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
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return NULL;
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}
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return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
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}
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const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs)
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{
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return bs->signature;
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}
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const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs)
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{
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return &bs->signatureAlgorithm;
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}
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const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs)
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{
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return &bs->tbsResponseData;
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}
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/*
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* Return number of OCSP_SINGLERESP responses present in a basic response.
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*/
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int OCSP_resp_count(OCSP_BASICRESP *bs)
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{
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if (!bs)
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return -1;
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return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses);
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}
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/* Extract an OCSP_SINGLERESP response with a given index */
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OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
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{
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if (!bs)
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return NULL;
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return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx);
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}
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const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(const OCSP_BASICRESP* bs)
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{
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return bs->tbsResponseData.producedAt;
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}
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const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs)
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{
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return bs->certs;
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}
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int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
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const ASN1_OCTET_STRING **pid,
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const X509_NAME **pname)
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{
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const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
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if (rid->type == V_OCSP_RESPID_NAME) {
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*pname = rid->value.byName;
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*pid = NULL;
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} else if (rid->type == V_OCSP_RESPID_KEY) {
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*pid = rid->value.byKey;
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*pname = NULL;
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} else {
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return 0;
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}
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return 1;
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}
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int OCSP_resp_get1_id(const OCSP_BASICRESP *bs,
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ASN1_OCTET_STRING **pid,
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X509_NAME **pname)
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{
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const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
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if (rid->type == V_OCSP_RESPID_NAME) {
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*pname = X509_NAME_dup(rid->value.byName);
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*pid = NULL;
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} else if (rid->type == V_OCSP_RESPID_KEY) {
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*pid = ASN1_OCTET_STRING_dup(rid->value.byKey);
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*pname = NULL;
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} else {
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return 0;
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}
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if (*pname == NULL && *pid == NULL)
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return 0;
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return 1;
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}
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/* Look single response matching a given certificate ID */
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int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
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{
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int i;
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STACK_OF(OCSP_SINGLERESP) *sresp;
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OCSP_SINGLERESP *single;
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if (!bs)
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return -1;
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if (last < 0)
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last = 0;
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else
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last++;
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sresp = bs->tbsResponseData.responses;
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for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
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single = sk_OCSP_SINGLERESP_value(sresp, i);
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if (!OCSP_id_cmp(id, single->certId))
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return i;
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}
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return -1;
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}
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/*
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* Extract status information from an OCSP_SINGLERESP structure. Note: the
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* revtime and reason values are only set if the certificate status is
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* revoked. Returns numerical value of status.
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*/
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int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd)
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{
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int ret;
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OCSP_CERTSTATUS *cst;
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if (!single)
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return -1;
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cst = single->certStatus;
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ret = cst->type;
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if (ret == V_OCSP_CERTSTATUS_REVOKED) {
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OCSP_REVOKEDINFO *rev = cst->value.revoked;
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if (revtime)
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*revtime = rev->revocationTime;
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if (reason) {
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if (rev->revocationReason)
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*reason = ASN1_ENUMERATED_get(rev->revocationReason);
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else
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*reason = -1;
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}
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}
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if (thisupd)
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*thisupd = single->thisUpdate;
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if (nextupd)
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*nextupd = single->nextUpdate;
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return ret;
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}
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/*
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* This function combines the previous ones: look up a certificate ID and if
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* found extract status information. Return 0 is successful.
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*/
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int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
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int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd)
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{
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int i;
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OCSP_SINGLERESP *single;
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i = OCSP_resp_find(bs, id, -1);
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/* Maybe check for multiple responses and give an error? */
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if (i < 0)
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return 0;
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single = OCSP_resp_get0(bs, i);
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i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
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if (status)
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*status = i;
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return 1;
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}
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/*
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* Check validity of thisUpdate and nextUpdate fields. It is possible that
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* the request will take a few seconds to process and/or the time won't be
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* totally accurate. Therefore to avoid rejecting otherwise valid time we
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* allow the times to be within 'nsec' of the current time. Also to avoid
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* accepting very old responses without a nextUpdate field an optional maxage
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* parameter specifies the maximum age the thisUpdate field can be.
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*/
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int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
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ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
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{
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int ret = 1;
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time_t t_now, t_tmp;
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time(&t_now);
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/* Check thisUpdate is valid and not more than nsec in the future */
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if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
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ret = 0;
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} else {
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t_tmp = t_now + nsec;
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if (X509_cmp_time(thisupd, &t_tmp) > 0) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
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ret = 0;
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}
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/*
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* If maxsec specified check thisUpdate is not more than maxsec in
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* the past
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*/
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if (maxsec >= 0) {
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t_tmp = t_now - maxsec;
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if (X509_cmp_time(thisupd, &t_tmp) < 0) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
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ret = 0;
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}
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}
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}
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if (!nextupd)
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return ret;
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/* Check nextUpdate is valid and not more than nsec in the past */
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if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
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ret = 0;
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} else {
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t_tmp = t_now - nsec;
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if (X509_cmp_time(nextupd, &t_tmp) < 0) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
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ret = 0;
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}
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}
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/* Also don't allow nextUpdate to precede thisUpdate */
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if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
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OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
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OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
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ret = 0;
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}
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return ret;
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}
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const OCSP_CERTID *OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP *single)
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{
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return single->certId;
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}
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