/*

 * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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 "internal/cryptlib.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 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()) == NULL)

        goto err;

    if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status)))

        goto err;

    if (!bs)

        return rsp;

    if ((rsp->responseBytes = OCSP_RESPBYTES_new()) == NULL)

        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:

    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 == NULL

        && (rsp->tbsResponseData.responses

                = sk_OCSP_SINGLERESP_new_null()) == NULL)

        goto err;

    if ((single = OCSP_SINGLERESP_new()) == NULL)

        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)) == NULL)

        goto err;

    cs = single->certStatus;

    switch (cs->type = status) {

    case V_OCSP_CERTSTATUS_REVOKED:

        if (!revtime) {

            ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_REVOKED_TIME);

            goto err;

        }

        if ((cs->value.revoked = ri = OCSP_REVOKEDINFO_new()) == NULL)

            goto err;

        if (!ASN1_TIME_to_generalizedtime(revtime, &ri->revocationTime))

            goto err;

        if (reason != OCSP_REVOKED_STATUS_NOSTATUS) {

            if ((ri->revocationReason = ASN1_ENUMERATED_new()) == NULL)

                goto err;

            if (!(ASN1_ENUMERATED_set(ri->revocationReason, reason)))

                goto err;

        }

        break;

    case V_OCSP_CERTSTATUS_GOOD:

        if ((cs->value.good = ASN1_NULL_new()) == NULL)

            goto err;

        break;

    case V_OCSP_CERTSTATUS_UNKNOWN:

        if ((cs->value.unknown = ASN1_NULL_new()) == NULL)

            goto err;

        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)

{

    return ossl_x509_add_cert_new(&resp->certs, cert, X509_ADD_FLAG_UP_REF);

}

/*

 * Sign an OCSP response using the parameters contained in the digest context,

 * set the responderID to the subject name in the signer's certificate, and

 * include one or more optional certificates in the response.

 */

int OCSP_basic_sign_ctx(OCSP_BASICRESP *brsp,

                    X509 *signer, EVP_MD_CTX *ctx,

                    STACK_OF(X509) *certs, unsigned long flags)

{

    OCSP_RESPID *rid;

    EVP_PKEY *pkey;

    if (ctx == NULL || EVP_MD_CTX_get_pkey_ctx(ctx) == NULL) {

        ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_SIGNER_KEY);

        goto err;

    }

    pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));

    if (pkey == NULL || !X509_check_private_key(signer, pkey)) {

        ERR_raise(ERR_LIB_OCSP, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);

        goto err;

    }

    if (!(flags & OCSP_NOCERTS)) {

        if (!OCSP_basic_add1_cert(brsp, signer)

            || !X509_add_certs(brsp->certs, certs, X509_ADD_FLAG_UP_REF))

            goto err;

    }

    rid = &brsp->tbsResponseData.responderId;

    if (flags & OCSP_RESPID_KEY) {

        if (!OCSP_RESPID_set_by_key(rid, signer))

            goto err;

    } else if (!OCSP_RESPID_set_by_name(rid, signer)) {

        goto err;

    }

    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_ctx(brsp, ctx, 0))

        goto err;

    return 1;

 err:

    return 0;

}

int OCSP_basic_sign(OCSP_BASICRESP *brsp,

                    X509 *signer, EVP_PKEY *key, const EVP_MD *dgst,

                    STACK_OF(X509) *certs, unsigned long flags)

{

    EVP_MD_CTX *ctx = EVP_MD_CTX_new();

    EVP_PKEY_CTX *pkctx = NULL;

    int i;

    if (ctx == NULL)

        return 0;

    if (!EVP_DigestSignInit_ex(ctx, &pkctx, EVP_MD_get0_name(dgst),

                               signer->libctx, signer->propq, key, NULL)) {

        EVP_MD_CTX_free(ctx);

        return 0;

    }

    i = OCSP_basic_sign_ctx(brsp, signer, ctx, certs, flags);

    EVP_MD_CTX_free(ctx);

    return i;

}

int OCSP_RESPID_set_by_name(OCSP_RESPID *respid, X509 *cert)

{

    if (!X509_NAME_set(&respid->value.byName, X509_get_subject_name(cert)))

        return 0;

    respid->type = V_OCSP_RESPID_NAME;

    return 1;

}

int OCSP_RESPID_set_by_key_ex(OCSP_RESPID *respid, X509 *cert,

                              OSSL_LIB_CTX *libctx, const char *propq)

{

    ASN1_OCTET_STRING *byKey = NULL;

    unsigned char md[SHA_DIGEST_LENGTH];

    EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);

    int ret = 0;

    if (sha1 == NULL)

        return 0;

    /* RFC2560 requires SHA1 */

    if (!X509_pubkey_digest(cert, sha1, md, NULL))

        goto err;

    byKey = ASN1_OCTET_STRING_new();

    if (byKey == NULL)

        goto err;

    if (!(ASN1_OCTET_STRING_set(byKey, md, SHA_DIGEST_LENGTH))) {

        ASN1_OCTET_STRING_free(byKey);

        goto err;

    }

    respid->type = V_OCSP_RESPID_KEY;

    respid->value.byKey = byKey;

    ret = 1;

 err:

    EVP_MD_free(sha1);

    return ret;

}

int OCSP_RESPID_set_by_key(OCSP_RESPID *respid, X509 *cert)

{

    if (cert == NULL)

        return 0;

    return OCSP_RESPID_set_by_key_ex(respid, cert, cert->libctx, cert->propq);

}

int OCSP_RESPID_match_ex(OCSP_RESPID *respid, X509 *cert, OSSL_LIB_CTX *libctx,

                         const char *propq)

{

    EVP_MD *sha1 = NULL;

    int ret = 0;

    if (respid->type == V_OCSP_RESPID_KEY) {

        unsigned char md[SHA_DIGEST_LENGTH];

        sha1 = EVP_MD_fetch(libctx, "SHA1", propq);

        if (sha1 == NULL)

            goto err;

        if (respid->value.byKey == NULL)

            goto err;

        /* RFC2560 requires SHA1 */

        if (!X509_pubkey_digest(cert, sha1, md, NULL))

            goto err;

        ret = (ASN1_STRING_length(respid->value.byKey) == SHA_DIGEST_LENGTH)

              && (memcmp(ASN1_STRING_get0_data(respid->value.byKey), md,

                         SHA_DIGEST_LENGTH) == 0);

    } else if (respid->type == V_OCSP_RESPID_NAME) {

        if (respid->value.byName == NULL)

            return 0;

        return X509_NAME_cmp(respid->value.byName,

                             X509_get_subject_name(cert)) == 0;

    }

 err:

    EVP_MD_free(sha1);

    return ret;

}

int OCSP_RESPID_match(OCSP_RESPID *respid, X509 *cert)

{

    if (cert == NULL)

        return 0;

    return OCSP_RESPID_match_ex(respid, cert, cert->libctx, cert->propq);

}