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ocsp.c

/* ocsp.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 1999 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
 *    licensing@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).
 *
 */
#ifndef OPENSSL_NO_OCSP

#include <stdio.h>
#include <string.h>
#include "apps.h"
#include <openssl/pem.h>
#include <openssl/ocsp.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/bn.h>

/* Maximum leeway in validity period: default 5 minutes */
#define MAX_VALIDITY_PERIOD   (5 * 60)

static int add_ocsp_cert(OCSP_REQUEST **req, X509 *cert, X509 *issuer,
                        STACK_OF(OCSP_CERTID) *ids);
static int add_ocsp_serial(OCSP_REQUEST **req, char *serial, X509 *issuer,
                        STACK_OF(OCSP_CERTID) *ids);
static int print_ocsp_summary(BIO *out, OCSP_BASICRESP *bs, OCSP_REQUEST *req,
                        STACK *names, STACK_OF(OCSP_CERTID) *ids,
                        long nsec, long maxage);

static int make_ocsp_response(OCSP_RESPONSE **resp, OCSP_REQUEST *req, CA_DB *db,
                  X509 *ca, X509 *rcert, EVP_PKEY *rkey,
                  STACK_OF(X509) *rother, unsigned long flags,
                  int nmin, int ndays);

static char **lookup_serial(CA_DB *db, ASN1_INTEGER *ser);
static BIO *init_responder(char *port);
static int do_responder(OCSP_REQUEST **preq, BIO **pcbio, BIO *acbio, char *port);
static int send_ocsp_response(BIO *cbio, OCSP_RESPONSE *resp);

#undef PROG
#define PROG ocsp_main

int MAIN(int, char **);

int MAIN(int argc, char **argv)
      {
      ENGINE *e = NULL;
      char **args;
      char *host = NULL, *port = NULL, *path = "/";
      char *reqin = NULL, *respin = NULL;
      char *reqout = NULL, *respout = NULL;
      char *signfile = NULL, *keyfile = NULL;
      char *rsignfile = NULL, *rkeyfile = NULL;
      char *outfile = NULL;
      int add_nonce = 1, noverify = 0, use_ssl = -1;
      OCSP_REQUEST *req = NULL;
      OCSP_RESPONSE *resp = NULL;
      OCSP_BASICRESP *bs = NULL;
      X509 *issuer = NULL, *cert = NULL;
      X509 *signer = NULL, *rsigner = NULL;
      EVP_PKEY *key = NULL, *rkey = NULL;
      BIO *acbio = NULL, *cbio = NULL;
      BIO *derbio = NULL;
      BIO *out = NULL;
      int req_text = 0, resp_text = 0;
      long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
      char *CAfile = NULL, *CApath = NULL;
      X509_STORE *store = NULL;
      SSL_CTX *ctx = NULL;
      STACK_OF(X509) *sign_other = NULL, *verify_other = NULL, *rother = NULL;
      char *sign_certfile = NULL, *verify_certfile = NULL, *rcertfile = NULL;
      unsigned long sign_flags = 0, verify_flags = 0, rflags = 0;
      int ret = 1;
      int accept_count = -1;
      int badarg = 0;
      int i;
      int ignore_err = 0;
      STACK *reqnames = NULL;
      STACK_OF(OCSP_CERTID) *ids = NULL;

      X509 *rca_cert = NULL;
      char *ridx_filename = NULL;
      char *rca_filename = NULL;
      CA_DB *rdb = NULL;
      int nmin = 0, ndays = -1;

      if (bio_err == NULL) bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);

      if (!load_config(bio_err, NULL))
            goto end;
      SSL_load_error_strings();
      OpenSSL_add_ssl_algorithms();
      args = argv + 1;
      reqnames = sk_new_null();
      ids = sk_OCSP_CERTID_new_null();
      while (!badarg && *args && *args[0] == '-')
            {
            if (!strcmp(*args, "-out"))
                  {
                  if (args[1])
                        {
                        args++;
                        outfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-url"))
                  {
                  if (args[1])
                        {
                        args++;
                        if (!OCSP_parse_url(*args, &host, &port, &path, &use_ssl))
                              {
                              BIO_printf(bio_err, "Error parsing URL\n");
                              badarg = 1;
                              }
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-host"))
                  {
                  if (args[1])
                        {
                        args++;
                        host = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-port"))
                  {
                  if (args[1])
                        {
                        args++;
                        port = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-ignore_err"))
                  ignore_err = 1;
            else if (!strcmp(*args, "-noverify"))
                  noverify = 1;
            else if (!strcmp(*args, "-nonce"))
                  add_nonce = 2;
            else if (!strcmp(*args, "-no_nonce"))
                  add_nonce = 0;
            else if (!strcmp(*args, "-resp_no_certs"))
                  rflags |= OCSP_NOCERTS;
            else if (!strcmp(*args, "-resp_key_id"))
                  rflags |= OCSP_RESPID_KEY;
            else if (!strcmp(*args, "-no_certs"))
                  sign_flags |= OCSP_NOCERTS;
            else if (!strcmp(*args, "-no_signature_verify"))
                  verify_flags |= OCSP_NOSIGS;
            else if (!strcmp(*args, "-no_cert_verify"))
                  verify_flags |= OCSP_NOVERIFY;
            else if (!strcmp(*args, "-no_chain"))
                  verify_flags |= OCSP_NOCHAIN;
            else if (!strcmp(*args, "-no_cert_checks"))
                  verify_flags |= OCSP_NOCHECKS;
            else if (!strcmp(*args, "-no_explicit"))
                  verify_flags |= OCSP_NOEXPLICIT;
            else if (!strcmp(*args, "-trust_other"))
                  verify_flags |= OCSP_TRUSTOTHER;
            else if (!strcmp(*args, "-no_intern"))
                  verify_flags |= OCSP_NOINTERN;
            else if (!strcmp(*args, "-text"))
                  {
                  req_text = 1;
                  resp_text = 1;
                  }
            else if (!strcmp(*args, "-req_text"))
                  req_text = 1;
            else if (!strcmp(*args, "-resp_text"))
                  resp_text = 1;
            else if (!strcmp(*args, "-reqin"))
                  {
                  if (args[1])
                        {
                        args++;
                        reqin = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-respin"))
                  {
                  if (args[1])
                        {
                        args++;
                        respin = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-signer"))
                  {
                  if (args[1])
                        {
                        args++;
                        signfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-VAfile"))
                  {
                  if (args[1])
                        {
                        args++;
                        verify_certfile = *args;
                        verify_flags |= OCSP_TRUSTOTHER;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-sign_other"))
                  {
                  if (args[1])
                        {
                        args++;
                        sign_certfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-verify_other"))
                  {
                  if (args[1])
                        {
                        args++;
                        verify_certfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-CAfile"))
                  {
                  if (args[1])
                        {
                        args++;
                        CAfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-CApath"))
                  {
                  if (args[1])
                        {
                        args++;
                        CApath = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-validity_period"))
                  {
                  if (args[1])
                        {
                        args++;
                        nsec = atol(*args);
                        if (nsec < 0)
                              {
                              BIO_printf(bio_err,
                                    "Illegal validity period %s\n",
                                    *args);
                              badarg = 1;
                              }
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-status_age"))
                  {
                  if (args[1])
                        {
                        args++;
                        maxage = atol(*args);
                        if (maxage < 0)
                              {
                              BIO_printf(bio_err,
                                    "Illegal validity age %s\n",
                                    *args);
                              badarg = 1;
                              }
                        }
                  else badarg = 1;
                  }
             else if (!strcmp(*args, "-signkey"))
                  {
                  if (args[1])
                        {
                        args++;
                        keyfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-reqout"))
                  {
                  if (args[1])
                        {
                        args++;
                        reqout = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-respout"))
                  {
                  if (args[1])
                        {
                        args++;
                        respout = *args;
                        }
                  else badarg = 1;
                  }
             else if (!strcmp(*args, "-path"))
                  {
                  if (args[1])
                        {
                        args++;
                        path = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-issuer"))
                  {
                  if (args[1])
                        {
                        args++;
                        X509_free(issuer);
                        issuer = load_cert(bio_err, *args, FORMAT_PEM,
                              NULL, e, "issuer certificate");
                        if(!issuer) goto end;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-cert"))
                  {
                  if (args[1])
                        {
                        args++;
                        X509_free(cert);
                        cert = load_cert(bio_err, *args, FORMAT_PEM,
                              NULL, e, "certificate");
                        if(!cert) goto end;
                        if(!add_ocsp_cert(&req, cert, issuer, ids))
                              goto end;
                        if(!sk_push(reqnames, *args))
                              goto end;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-serial"))
                  {
                  if (args[1])
                        {
                        args++;
                        if(!add_ocsp_serial(&req, *args, issuer, ids))
                              goto end;
                        if(!sk_push(reqnames, *args))
                              goto end;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-index"))
                  {
                  if (args[1])
                        {
                        args++;
                        ridx_filename = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-CA"))
                  {
                  if (args[1])
                        {
                        args++;
                        rca_filename = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-nmin"))
                  {
                  if (args[1])
                        {
                        args++;
                        nmin = atol(*args);
                        if (nmin < 0)
                              {
                              BIO_printf(bio_err,
                                    "Illegal update period %s\n",
                                    *args);
                              badarg = 1;
                              }
                        }
                        if (ndays == -1)
                              ndays = 0;
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-nrequest"))
                  {
                  if (args[1])
                        {
                        args++;
                        accept_count = atol(*args);
                        if (accept_count < 0)
                              {
                              BIO_printf(bio_err,
                                    "Illegal accept count %s\n",
                                    *args);
                              badarg = 1;
                              }
                        }
                  else badarg = 1;
                  }
            else if (!strcmp (*args, "-ndays"))
                  {
                  if (args[1])
                        {
                        args++;
                        ndays = atol(*args);
                        if (ndays < 0)
                              {
                              BIO_printf(bio_err,
                                    "Illegal update period %s\n",
                                    *args);
                              badarg = 1;
                              }
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-rsigner"))
                  {
                  if (args[1])
                        {
                        args++;
                        rsignfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-rkey"))
                  {
                  if (args[1])
                        {
                        args++;
                        rkeyfile = *args;
                        }
                  else badarg = 1;
                  }
            else if (!strcmp(*args, "-rother"))
                  {
                  if (args[1])
                        {
                        args++;
                        rcertfile = *args;
                        }
                  else badarg = 1;
                  }
            else badarg = 1;
            args++;
            }

      /* Have we anything to do? */
      if (!req && !reqin && !respin && !(port && ridx_filename)) badarg = 1;

      if (badarg)
            {
            BIO_printf (bio_err, "OCSP utility\n");
            BIO_printf (bio_err, "Usage ocsp [options]\n");
            BIO_printf (bio_err, "where options are\n");
            BIO_printf (bio_err, "-out file          output filename\n");
            BIO_printf (bio_err, "-issuer file       issuer certificate\n");
            BIO_printf (bio_err, "-cert file         certificate to check\n");
            BIO_printf (bio_err, "-serial n          serial number to check\n");
            BIO_printf (bio_err, "-signer file       certificate to sign OCSP request with\n");
            BIO_printf (bio_err, "-signkey file      private key to sign OCSP request with\n");
            BIO_printf (bio_err, "-sign_other file   additional certificates to include in signed request\n");
            BIO_printf (bio_err, "-no_certs          don't include any certificates in signed request\n");
            BIO_printf (bio_err, "-req_text          print text form of request\n");
            BIO_printf (bio_err, "-resp_text         print text form of response\n");
            BIO_printf (bio_err, "-text              print text form of request and response\n");
            BIO_printf (bio_err, "-reqout file       write DER encoded OCSP request to \"file\"\n");
            BIO_printf (bio_err, "-respout file      write DER encoded OCSP reponse to \"file\"\n");
            BIO_printf (bio_err, "-reqin file        read DER encoded OCSP request from \"file\"\n");
            BIO_printf (bio_err, "-respin file       read DER encoded OCSP reponse from \"file\"\n");
            BIO_printf (bio_err, "-nonce             add OCSP nonce to request\n");
            BIO_printf (bio_err, "-no_nonce          don't add OCSP nonce to request\n");
            BIO_printf (bio_err, "-url URL           OCSP responder URL\n");
            BIO_printf (bio_err, "-host host:n       send OCSP request to host on port n\n");
            BIO_printf (bio_err, "-path              path to use in OCSP request\n");
            BIO_printf (bio_err, "-CApath dir        trusted certificates directory\n");
            BIO_printf (bio_err, "-CAfile file       trusted certificates file\n");
            BIO_printf (bio_err, "-VAfile file       validator certificates file\n");
            BIO_printf (bio_err, "-validity_period n maximum validity discrepancy in seconds\n");
            BIO_printf (bio_err, "-status_age n      maximum status age in seconds\n");
            BIO_printf (bio_err, "-noverify          don't verify response at all\n");
            BIO_printf (bio_err, "-verify_other file additional certificates to search for signer\n");
            BIO_printf (bio_err, "-trust_other       don't verify additional certificates\n");
            BIO_printf (bio_err, "-no_intern         don't search certificates contained in response for signer\n");
            BIO_printf (bio_err, "-no_signature_verify don't check signature on response\n");
            BIO_printf (bio_err, "-no_cert_verify    don't check signing certificate\n");
            BIO_printf (bio_err, "-no_chain          don't chain verify response\n");
            BIO_printf (bio_err, "-no_cert_checks    don't do additional checks on signing certificate\n");
            BIO_printf (bio_err, "-port num            port to run responder on\n");
            BIO_printf (bio_err, "-index file    certificate status index file\n");
            BIO_printf (bio_err, "-CA file             CA certificate\n");
            BIO_printf (bio_err, "-rsigner file  responder certificate to sign responses with\n");
            BIO_printf (bio_err, "-rkey file     responder key to sign responses with\n");
            BIO_printf (bio_err, "-rother file   other certificates to include in response\n");
            BIO_printf (bio_err, "-resp_no_certs     don't include any certificates in response\n");
            BIO_printf (bio_err, "-nmin n        number of minutes before next update\n");
            BIO_printf (bio_err, "-ndays n             number of days before next update\n");
            BIO_printf (bio_err, "-resp_key_id       identify reponse by signing certificate key ID\n");
            BIO_printf (bio_err, "-nrequest n        number of requests to accept (default unlimited)\n");
            goto end;
            }

      if(outfile) out = BIO_new_file(outfile, "w");
      else out = BIO_new_fp(stdout, BIO_NOCLOSE);

      if(!out)
            {
            BIO_printf(bio_err, "Error opening output file\n");
            goto end;
            }

      if (!req && (add_nonce != 2)) add_nonce = 0;

      if (!req && reqin)
            {
            derbio = BIO_new_file(reqin, "rb");
            if (!derbio)
                  {
                  BIO_printf(bio_err, "Error Opening OCSP request file\n");
                  goto end;
                  }
            req = d2i_OCSP_REQUEST_bio(derbio, NULL);
            BIO_free(derbio);
            if(!req)
                  {
                  BIO_printf(bio_err, "Error reading OCSP request\n");
                  goto end;
                  }
            }

      if (!req && port)
            {
            acbio = init_responder(port);
            if (!acbio)
                  goto end;
            }

      if (rsignfile && !rdb)
            {
            if (!rkeyfile) rkeyfile = rsignfile;
            rsigner = load_cert(bio_err, rsignfile, FORMAT_PEM,
                  NULL, e, "responder certificate");
            if (!rsigner)
                  {
                  BIO_printf(bio_err, "Error loading responder certificate\n");
                  goto end;
                  }
            rca_cert = load_cert(bio_err, rca_filename, FORMAT_PEM,
                  NULL, e, "CA certificate");
            if (rcertfile)
                  {
                  rother = load_certs(bio_err, rcertfile, FORMAT_PEM,
                        NULL, e, "responder other certificates");
                  if (!rother) goto end;
                  }
            rkey = load_key(bio_err, rkeyfile, FORMAT_PEM, 0, NULL, NULL,
                  "responder private key");
            if (!rkey)
                  goto end;
            }
      if(acbio)
            BIO_printf(bio_err, "Waiting for OCSP client connections...\n");

      redo_accept:

      if (acbio)
            {
            if (!do_responder(&req, &cbio, acbio, port))
                  goto end;
            if (!req)
                  {
                  resp = OCSP_response_create(OCSP_RESPONSE_STATUS_MALFORMEDREQUEST, NULL);
                  send_ocsp_response(cbio, resp);
                  goto done_resp;
                  }
            }

      if (!req && (signfile || reqout || host || add_nonce || ridx_filename))
            {
            BIO_printf(bio_err, "Need an OCSP request for this operation!\n");
            goto end;
            }

      if (req && add_nonce) OCSP_request_add1_nonce(req, NULL, -1);

      if (signfile)
            {
            if (!keyfile) keyfile = signfile;
            signer = load_cert(bio_err, signfile, FORMAT_PEM,
                  NULL, e, "signer certificate");
            if (!signer)
                  {
                  BIO_printf(bio_err, "Error loading signer certificate\n");
                  goto end;
                  }
            if (sign_certfile)
                  {
                  sign_other = load_certs(bio_err, sign_certfile, FORMAT_PEM,
                        NULL, e, "signer certificates");
                  if (!sign_other) goto end;
                  }
            key = load_key(bio_err, keyfile, FORMAT_PEM, 0, NULL, NULL,
                  "signer private key");
            if (!key)
                  goto end;
            if (!OCSP_request_sign(req, signer, key, EVP_sha1(), sign_other, sign_flags))
                  {
                  BIO_printf(bio_err, "Error signing OCSP request\n");
                  goto end;
                  }
            }

      if (req_text && req) OCSP_REQUEST_print(out, req, 0);

      if (reqout)
            {
            derbio = BIO_new_file(reqout, "wb");
            if(!derbio)
                  {
                  BIO_printf(bio_err, "Error opening file %s\n", reqout);
                  goto end;
                  }
            i2d_OCSP_REQUEST_bio(derbio, req);
            BIO_free(derbio);
            }

      if (ridx_filename && (!rkey || !rsigner || !rca_cert))
            {
            BIO_printf(bio_err, "Need a responder certificate, key and CA for this operation!\n");
            goto end;
            }

      if (ridx_filename && !rdb)
            {
            rdb = load_index(ridx_filename, NULL);
            if (!rdb) goto end;
            if (!index_index(rdb)) goto end;
            }

      if (rdb)
            {
            i = make_ocsp_response(&resp, req, rdb, rca_cert, rsigner, rkey, rother, rflags, nmin, ndays);
            if (cbio)
                  send_ocsp_response(cbio, resp);
            }
      else if (host)
            {
#ifndef OPENSSL_NO_SOCK
            cbio = BIO_new_connect(host);
#else
            BIO_printf(bio_err, "Error creating connect BIO - sockets not supported.\n");
            goto end;
#endif
            if (!cbio)
                  {
                  BIO_printf(bio_err, "Error creating connect BIO\n");
                  goto end;
                  }
            if (port) BIO_set_conn_port(cbio, port);
            if (use_ssl == 1)
                  {
                  BIO *sbio;
#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
                  ctx = SSL_CTX_new(SSLv23_client_method());
#elif !defined(OPENSSL_NO_SSL3)
                  ctx = SSL_CTX_new(SSLv3_client_method());
#elif !defined(OPENSSL_NO_SSL2)
                  ctx = SSL_CTX_new(SSLv2_client_method());
#else
                  BIO_printf(bio_err, "SSL is disabled\n");
                  goto end;
#endif
                  if (ctx == NULL)
                        {
                        BIO_printf(bio_err, "Error creating SSL context.\n");
                        goto end;
                        }
                  SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
                  sbio = BIO_new_ssl(ctx, 1);
                  cbio = BIO_push(sbio, cbio);
                  }
            if (BIO_do_connect(cbio) <= 0)
                  {
                  BIO_printf(bio_err, "Error connecting BIO\n");
                  goto end;
                  }
            resp = OCSP_sendreq_bio(cbio, path, req);
            BIO_free_all(cbio);
            cbio = NULL;
            if (!resp)
                  {
                  BIO_printf(bio_err, "Error querying OCSP responsder\n");
                  goto end;
                  }
            }
      else if (respin)
            {
            derbio = BIO_new_file(respin, "rb");
            if (!derbio)
                  {
                  BIO_printf(bio_err, "Error Opening OCSP response file\n");
                  goto end;
                  }
            resp = d2i_OCSP_RESPONSE_bio(derbio, NULL);
            BIO_free(derbio);
            if(!resp)
                  {
                  BIO_printf(bio_err, "Error reading OCSP response\n");
                  goto end;
                  }
      
            }
      else
            {
            ret = 0;
            goto end;
            }

      done_resp:

      if (respout)
            {
            derbio = BIO_new_file(respout, "wb");
            if(!derbio)
                  {
                  BIO_printf(bio_err, "Error opening file %s\n", respout);
                  goto end;
                  }
            i2d_OCSP_RESPONSE_bio(derbio, resp);
            BIO_free(derbio);
            }

      i = OCSP_response_status(resp);

      if (i != OCSP_RESPONSE_STATUS_SUCCESSFUL)
            {
            BIO_printf(out, "Responder Error: %s (%d)\n",
                        OCSP_response_status_str(i), i);
            if (ignore_err)
                  goto redo_accept;
            ret = 0;
            goto end;
            }

      if (resp_text) OCSP_RESPONSE_print(out, resp, 0);

      /* If running as responder don't verify our own response */
      if (cbio)
            {
            if (accept_count > 0)
                  accept_count--;
            /* Redo if more connections needed */
            if (accept_count)
                  {
                  BIO_free_all(cbio);
                  cbio = NULL;
                  OCSP_REQUEST_free(req);
                  req = NULL;
                  OCSP_RESPONSE_free(resp);
                  resp = NULL;
                  goto redo_accept;
                  }
            goto end;
            }

      if (!store)
            store = setup_verify(bio_err, CAfile, CApath);
      if (!store)
            goto end;
      if (verify_certfile)
            {
            verify_other = load_certs(bio_err, verify_certfile, FORMAT_PEM,
                  NULL, e, "validator certificate");
            if (!verify_other) goto end;
            }

      bs = OCSP_response_get1_basic(resp);

      if (!bs)
            {
            BIO_printf(bio_err, "Error parsing response\n");
            goto end;
            }

      if (!noverify)
            {
            if (req && ((i = OCSP_check_nonce(req, bs)) <= 0))
                  {
                  if (i == -1)
                        BIO_printf(bio_err, "WARNING: no nonce in response\n");
                  else
                        {
                        BIO_printf(bio_err, "Nonce Verify error\n");
                        goto end;
                        }
                  }

            i = OCSP_basic_verify(bs, verify_other, store, verify_flags);
                if (i < 0) i = OCSP_basic_verify(bs, NULL, store, 0);

            if(i <= 0)
                  {
                  BIO_printf(bio_err, "Response Verify Failure\n");
                  ERR_print_errors(bio_err);
                  }
            else
                  BIO_printf(bio_err, "Response verify OK\n");

            }

      if (!print_ocsp_summary(out, bs, req, reqnames, ids, nsec, maxage))
            goto end;

      ret = 0;

end:
      ERR_print_errors(bio_err);
      X509_free(signer);
      X509_STORE_free(store);
      EVP_PKEY_free(key);
      EVP_PKEY_free(rkey);
      X509_free(issuer);
      X509_free(cert);
      X509_free(rsigner);
      X509_free(rca_cert);
      free_index(rdb);
      BIO_free_all(cbio);
      BIO_free_all(acbio);
      BIO_free(out);
      OCSP_REQUEST_free(req);
      OCSP_RESPONSE_free(resp);
      OCSP_BASICRESP_free(bs);
      sk_free(reqnames);
      sk_OCSP_CERTID_free(ids);
      sk_X509_pop_free(sign_other, X509_free);
      sk_X509_pop_free(verify_other, X509_free);

      if (use_ssl != -1)
            {
            OPENSSL_free(host);
            OPENSSL_free(port);
            OPENSSL_free(path);
            SSL_CTX_free(ctx);
            }

      OPENSSL_EXIT(ret);
}

static int add_ocsp_cert(OCSP_REQUEST **req, X509 *cert, X509 *issuer,
                        STACK_OF(OCSP_CERTID) *ids)
      {
      OCSP_CERTID *id;
      if(!issuer)
            {
            BIO_printf(bio_err, "No issuer certificate specified\n");
            return 0;
            }
      if(!*req) *req = OCSP_REQUEST_new();
      if(!*req) goto err;
      id = OCSP_cert_to_id(NULL, cert, issuer);
      if(!id || !sk_OCSP_CERTID_push(ids, id)) goto err;
      if(!OCSP_request_add0_id(*req, id)) goto err;
      return 1;

      err:
      BIO_printf(bio_err, "Error Creating OCSP request\n");
      return 0;
      }

static int add_ocsp_serial(OCSP_REQUEST **req, char *serial, X509 *issuer,
                        STACK_OF(OCSP_CERTID) *ids)
      {
      OCSP_CERTID *id;
      X509_NAME *iname;
      ASN1_BIT_STRING *ikey;
      ASN1_INTEGER *sno;
      if(!issuer)
            {
            BIO_printf(bio_err, "No issuer certificate specified\n");
            return 0;
            }
      if(!*req) *req = OCSP_REQUEST_new();
      if(!*req) goto err;
      iname = X509_get_subject_name(issuer);
      ikey = X509_get0_pubkey_bitstr(issuer);
      sno = s2i_ASN1_INTEGER(NULL, serial);
      if(!sno)
            {
            BIO_printf(bio_err, "Error converting serial number %s\n", serial);
            return 0;
            }
      id = OCSP_cert_id_new(EVP_sha1(), iname, ikey, sno);
      ASN1_INTEGER_free(sno);
      if(!id || !sk_OCSP_CERTID_push(ids, id)) goto err;
      if(!OCSP_request_add0_id(*req, id)) goto err;
      return 1;

      err:
      BIO_printf(bio_err, "Error Creating OCSP request\n");
      return 0;
      }

static int print_ocsp_summary(BIO *out, OCSP_BASICRESP *bs, OCSP_REQUEST *req,
                              STACK *names, STACK_OF(OCSP_CERTID) *ids,
                              long nsec, long maxage)
      {
      OCSP_CERTID *id;
      char *name;
      int i;

      int status, reason;

      ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;

      if (!bs || !req || !sk_num(names) || !sk_OCSP_CERTID_num(ids))
            return 1;

      for (i = 0; i < sk_OCSP_CERTID_num(ids); i++)
            {
            id = sk_OCSP_CERTID_value(ids, i);
            name = sk_value(names, i);
            BIO_printf(out, "%s: ", name);

            if(!OCSP_resp_find_status(bs, id, &status, &reason,
                              &rev, &thisupd, &nextupd))
                  {
                  BIO_puts(out, "ERROR: No Status found.\n");
                  continue;
                  }

            /* Check validity: if invalid write to output BIO so we
             * know which response this refers to.
             */
            if (!OCSP_check_validity(thisupd, nextupd, nsec, maxage))
                  {
                  BIO_puts(out, "WARNING: Status times invalid.\n");
                  ERR_print_errors(out);
                  }
            BIO_printf(out, "%s\n", OCSP_cert_status_str(status));

            BIO_puts(out, "\tThis Update: ");
            ASN1_GENERALIZEDTIME_print(out, thisupd);
            BIO_puts(out, "\n");

            if(nextupd)
                  {
                  BIO_puts(out, "\tNext Update: ");
                  ASN1_GENERALIZEDTIME_print(out, nextupd);
                  BIO_puts(out, "\n");
                  }

            if (status != V_OCSP_CERTSTATUS_REVOKED)
                  continue;

            if (reason != -1)
                  BIO_printf(out, "\tReason: %s\n",
                        OCSP_crl_reason_str(reason));

            BIO_puts(out, "\tRevocation Time: ");
            ASN1_GENERALIZEDTIME_print(out, rev);
            BIO_puts(out, "\n");
            }

      return 1;
      }


static int make_ocsp_response(OCSP_RESPONSE **resp, OCSP_REQUEST *req, CA_DB *db,
                  X509 *ca, X509 *rcert, EVP_PKEY *rkey,
                  STACK_OF(X509) *rother, unsigned long flags,
                  int nmin, int ndays)
      {
      ASN1_TIME *thisupd = NULL, *nextupd = NULL;
      OCSP_CERTID *cid, *ca_id = NULL;
      OCSP_BASICRESP *bs = NULL;
      int i, id_count, ret = 1;


      id_count = OCSP_request_onereq_count(req);

      if (id_count <= 0)
            {
            *resp = OCSP_response_create(OCSP_RESPONSE_STATUS_MALFORMEDREQUEST, NULL);
            goto end;
            }

      ca_id = OCSP_cert_to_id(EVP_sha1(), NULL, ca);

      bs = OCSP_BASICRESP_new();
      thisupd = X509_gmtime_adj(NULL, 0);
      if (ndays != -1)
            nextupd = X509_gmtime_adj(NULL, nmin * 60 + ndays * 3600 * 24 );

      /* Examine each certificate id in the request */
      for (i = 0; i < id_count; i++)
            {
            OCSP_ONEREQ *one;
            ASN1_INTEGER *serial;
            char **inf;
            one = OCSP_request_onereq_get0(req, i);
            cid = OCSP_onereq_get0_id(one);
            /* Is this request about our CA? */
            if (OCSP_id_issuer_cmp(ca_id, cid))
                  {
                  OCSP_basic_add1_status(bs, cid,
                                    V_OCSP_CERTSTATUS_UNKNOWN,
                                    0, NULL,
                                    thisupd, nextupd);
                  continue;
                  }
            OCSP_id_get0_info(NULL, NULL, NULL, &serial, cid);
            inf = lookup_serial(db, serial);
            if (!inf)
                  OCSP_basic_add1_status(bs, cid,
                                    V_OCSP_CERTSTATUS_UNKNOWN,
                                    0, NULL,
                                    thisupd, nextupd);
            else if (inf[DB_type][0] == DB_TYPE_VAL)
                  OCSP_basic_add1_status(bs, cid,
                                    V_OCSP_CERTSTATUS_GOOD,
                                    0, NULL,
                                    thisupd, nextupd);
            else if (inf[DB_type][0] == DB_TYPE_REV)
                  {
                  ASN1_OBJECT *inst = NULL;
                  ASN1_TIME *revtm = NULL;
                  ASN1_GENERALIZEDTIME *invtm = NULL;
                  OCSP_SINGLERESP *single;
                  int reason = -1;
                  unpack_revinfo(&revtm, &reason, &inst, &invtm, inf[DB_rev_date]);
                  single = OCSP_basic_add1_status(bs, cid,
                                    V_OCSP_CERTSTATUS_REVOKED,
                                    reason, revtm,
                                    thisupd, nextupd);
                  if (invtm)
                        OCSP_SINGLERESP_add1_ext_i2d(single, NID_invalidity_date, invtm, 0, 0);
                  else if (inst)
                        OCSP_SINGLERESP_add1_ext_i2d(single, NID_hold_instruction_code, inst, 0, 0);
                  ASN1_OBJECT_free(inst);
                  ASN1_TIME_free(revtm);
                  ASN1_GENERALIZEDTIME_free(invtm);
                  }
            }

      OCSP_copy_nonce(bs, req);
            
      OCSP_basic_sign(bs, rcert, rkey, EVP_sha1(), rother, flags);

      *resp = OCSP_response_create(OCSP_RESPONSE_STATUS_SUCCESSFUL, bs);

      end:
      ASN1_TIME_free(thisupd);
      ASN1_TIME_free(nextupd);
      OCSP_CERTID_free(ca_id);
      OCSP_BASICRESP_free(bs);
      return ret;

      }

static char **lookup_serial(CA_DB *db, ASN1_INTEGER *ser)
      {
      int i;
      BIGNUM *bn = NULL;
      char *itmp, *row[DB_NUMBER],**rrow;
      for (i = 0; i < DB_NUMBER; i++) row[i] = NULL;
      bn = ASN1_INTEGER_to_BN(ser,NULL);
      if (BN_is_zero(bn))
            itmp = BUF_strdup("00");
      else
            itmp = BN_bn2hex(bn);
      row[DB_serial] = itmp;
      BN_free(bn);
      rrow=TXT_DB_get_by_index(db->db,DB_serial,row);
      OPENSSL_free(itmp);
      return rrow;
      }

/* Quick and dirty OCSP server: read in and parse input request */

static BIO *init_responder(char *port)
      {
      BIO *acbio = NULL, *bufbio = NULL;
      bufbio = BIO_new(BIO_f_buffer());
      if (!bufbio) 
            goto err;
#ifndef OPENSSL_NO_SOCK
      acbio = BIO_new_accept(port);
#else
      BIO_printf(bio_err, "Error setting up accept BIO - sockets not supported.\n");
#endif
      if (!acbio)
            goto err;
      BIO_set_accept_bios(acbio, bufbio);
      bufbio = NULL;

      if (BIO_do_accept(acbio) <= 0)
            {
                  BIO_printf(bio_err, "Error setting up accept BIO\n");
                  ERR_print_errors(bio_err);
                  goto err;
            }

      return acbio;

      err:
      BIO_free_all(acbio);
      BIO_free(bufbio);
      return NULL;
      }

static int do_responder(OCSP_REQUEST **preq, BIO **pcbio, BIO *acbio, char *port)
      {
      int have_post = 0, len;
      OCSP_REQUEST *req = NULL;
      char inbuf[1024];
      BIO *cbio = NULL;

      if (BIO_do_accept(acbio) <= 0)
            {
                  BIO_printf(bio_err, "Error accepting connection\n");
                  ERR_print_errors(bio_err);
                  return 0;
            }

      cbio = BIO_pop(acbio);
      *pcbio = cbio;

      for(;;)
            {
            len = BIO_gets(cbio, inbuf, sizeof inbuf);
            if (len <= 0)
                  return 1;
            /* Look for "POST" signalling start of query */
            if (!have_post)
                  {
                  if(strncmp(inbuf, "POST", 4))
                        {
                        BIO_printf(bio_err, "Invalid request\n");
                        return 1;
                        }
                  have_post = 1;
                  }
            /* Look for end of headers */
            if ((inbuf[0] == '\r') || (inbuf[0] == '\n'))
                  break;
            }

      /* Try to read OCSP request */

      req = d2i_OCSP_REQUEST_bio(cbio, NULL);

      if (!req)
            {
            BIO_printf(bio_err, "Error parsing OCSP request\n");
            ERR_print_errors(bio_err);
            }

      *preq = req;

      return 1;

      }

static int send_ocsp_response(BIO *cbio, OCSP_RESPONSE *resp)
      {
      char http_resp[] = 
            "HTTP/1.0 200 OK\r\nContent-type: application/ocsp-response\r\n"
            "Content-Length: %d\r\n\r\n";
      if (!cbio)
            return 0;
      BIO_printf(cbio, http_resp, i2d_OCSP_RESPONSE(resp, NULL));
      i2d_OCSP_RESPONSE_bio(cbio, resp);
      (void)BIO_flush(cbio);
      return 1;
      }

#endif

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