/* ocsp_srv.c */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 2001.
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <cryptlib.h>
#include <openssl/objects.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/ocsp.h>

/*
 * Utility functions related to sending OCSP responses and extracting
 * relevant information from the request.
 */

int OCSP_request_onereq_count(OCSP_REQUEST *req)
{
    return sk_OCSP_ONEREQ_num(req->tbsRequest->requestList);
}

OCSP_ONEREQ *OCSP_request_onereq_get0(OCSP_REQUEST *req, int i)
{
    return sk_OCSP_ONEREQ_value(req->tbsRequest->requestList, i);
}

OCSP_CERTID *OCSP_onereq_get0_id(OCSP_ONEREQ *one)
{
    return one->reqCert;
}

int OCSP_id_get0_info(ASN1_OCTET_STRING **piNameHash, ASN1_OBJECT **pmd,
                      ASN1_OCTET_STRING **pikeyHash,
                      ASN1_INTEGER **pserial, OCSP_CERTID *cid)
{
    if (!cid)
        return 0;
    if (pmd)
        *pmd = cid->hashAlgorithm->algorithm;
    if (piNameHash)
        *piNameHash = cid->issuerNameHash;
    if (pikeyHash)
        *pikeyHash = cid->issuerKeyHash;
    if (pserial)
        *pserial = cid->serialNumber;
    return 1;
}

int OCSP_request_is_signed(OCSP_REQUEST *req)
{
    if (req->optionalSignature)
        return 1;
    return 0;
}

/* Create an OCSP response and encode an optional basic response */
OCSP_RESPONSE *OCSP_response_create(int status, OCSP_BASICRESP *bs)
{
    OCSP_RESPONSE *rsp = NULL;

    if (!(rsp = OCSP_RESPONSE_new()))
        goto err;
    if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status)))
        goto err;
    if (!bs)
        return rsp;
    if (!(rsp->responseBytes = OCSP_RESPBYTES_new()))
        goto err;
    rsp->responseBytes->responseType = OBJ_nid2obj(NID_id_pkix_OCSP_basic);
    if (!ASN1_item_pack
        (bs, ASN1_ITEM_rptr(OCSP_BASICRESP), &rsp->responseBytes->response))
         goto err;
    return rsp;
 err:
    if (rsp)
        OCSP_RESPONSE_free(rsp);
    return NULL;
}

OCSP_SINGLERESP *OCSP_basic_add1_status(OCSP_BASICRESP *rsp,
                                        OCSP_CERTID *cid,
                                        int status, int reason,
                                        ASN1_TIME *revtime,
                                        ASN1_TIME *thisupd,
                                        ASN1_TIME *nextupd)
{
    OCSP_SINGLERESP *single = NULL;
    OCSP_CERTSTATUS *cs;
    OCSP_REVOKEDINFO *ri;

    if (!rsp->tbsResponseData->responses &&
        !(rsp->tbsResponseData->responses = sk_OCSP_SINGLERESP_new_null()))
        goto err;

    if (!(single = OCSP_SINGLERESP_new()))
        goto err;

    if (!ASN1_TIME_to_generalizedtime(thisupd, &single->thisUpdate))
        goto err;
    if (nextupd &&
        !ASN1_TIME_to_generalizedtime(nextupd, &single->nextUpdate))
        goto err;

    OCSP_CERTID_free(single->certId);

    if (!(single->certId = OCSP_CERTID_dup(cid)))
        goto err;

    cs = single->certStatus;
    switch (cs->type = status) {
    case V_OCSP_CERTSTATUS_REVOKED:
        if (!revtime) {
            OCSPerr(OCSP_F_OCSP_BASIC_ADD1_STATUS, OCSP_R_NO_REVOKED_TIME);
            goto err;
        }
        if (!(cs->value.revoked = ri = OCSP_REVOKEDINFO_new()))
            goto err;
        if (!ASN1_TIME_to_generalizedtime(revtime, &ri->revocationTime))
            goto err;
        if (reason != OCSP_REVOKED_STATUS_NOSTATUS) {
            if (!(ri->revocationReason = ASN1_ENUMERATED_new()))
                goto err;
            if (!(ASN1_ENUMERATED_set(ri->revocationReason, reason)))
                goto err;
        }
        break;

    case V_OCSP_CERTSTATUS_GOOD:
        cs->value.good = ASN1_NULL_new();
        break;

    case V_OCSP_CERTSTATUS_UNKNOWN:
        cs->value.unknown = ASN1_NULL_new();
        break;

    default:
        goto err;

    }
    if (!(sk_OCSP_SINGLERESP_push(rsp->tbsResponseData->responses, single)))
        goto err;
    return single;
 err:
    OCSP_SINGLERESP_free(single);
    return NULL;
}

/* Add a certificate to an OCSP request */

int OCSP_basic_add1_cert(OCSP_BASICRESP *resp, X509 *cert)
{
    if (!resp->certs && !(resp->certs = sk_X509_new_null()))
        return 0;

    if (!sk_X509_push(resp->certs, cert))
        return 0;
    CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
    return 1;
}

int OCSP_basic_sign(OCSP_BASICRESP *brsp,
                    X509 *signer, EVP_PKEY *key, const EVP_MD *dgst,
                    STACK_OF(X509) *certs, unsigned long flags)
{
    int i;
    OCSP_RESPID *rid;

    if (!X509_check_private_key(signer, key)) {
        OCSPerr(OCSP_F_OCSP_BASIC_SIGN,
                OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
        goto err;
    }

    if (!(flags & OCSP_NOCERTS)) {
        if (!OCSP_basic_add1_cert(brsp, signer))
            goto err;
        for (i = 0; i < sk_X509_num(certs); i++) {
            X509 *tmpcert = sk_X509_value(certs, i);
            if (!OCSP_basic_add1_cert(brsp, tmpcert))
                goto err;
        }
    }

    rid = brsp->tbsResponseData->responderId;
    if (flags & OCSP_RESPID_KEY) {
        unsigned char md[SHA_DIGEST_LENGTH];
        X509_pubkey_digest(signer, EVP_sha1(), md, NULL);
        if (!(rid->value.byKey = ASN1_OCTET_STRING_new()))
            goto err;
        if (!(ASN1_OCTET_STRING_set(rid->value.byKey, md, SHA_DIGEST_LENGTH)))
            goto err;
        rid->type = V_OCSP_RESPID_KEY;
    } else {
        if (!X509_NAME_set(&rid->value.byName, X509_get_subject_name(signer)))
            goto err;
        rid->type = V_OCSP_RESPID_NAME;
    }

    if (!(flags & OCSP_NOTIME) &&
        !X509_gmtime_adj(brsp->tbsResponseData->producedAt, 0))
        goto err;

    /*
     * Right now, I think that not doing double hashing is the right thing.
     * -- Richard Levitte
     */

    if (!OCSP_BASICRESP_sign(brsp, key, dgst, 0))
        goto err;

    return 1;
 err:
    return 0;
}