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