/* $OpenBSD: ocsp.c,v 1.12 2017/01/21 09:29:09 deraadt Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) 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 <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <poll.h>
#include <time.h>

/* Needs to be included before the openssl headers! */
#include "apps.h"

#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.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, const EVP_MD * cert_id_md, X509 * issuer,
    STACK_OF(OCSP_CERTID) * ids);
static int add_ocsp_serial(OCSP_REQUEST ** req, char *serial, const EVP_MD * cert_id_md, X509 * issuer,
    STACK_OF(OCSP_CERTID) * ids);
static int print_ocsp_summary(BIO * out, OCSP_BASICRESP * bs, OCSP_REQUEST * req,
    STACK_OF(OPENSSL_STRING) * 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);
static OCSP_RESPONSE *query_responder(BIO * err, BIO * cbio, char *path,
    STACK_OF(CONF_VALUE) * headers,
    OCSP_REQUEST * req, int req_timeout);

int
ocsp_main(int argc, char **argv)
{
	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;
	STACK_OF(CONF_VALUE) * headers = NULL;
	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_timeout = -1;
	int req_text = 0, resp_text = 0;
	long nsec = MAX_VALIDITY_PERIOD, maxage = -1;
	char *CAfile = NULL, *CApath = NULL;
	X509_STORE *store = 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_OF(OPENSSL_STRING) * 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;
	const EVP_MD *cert_id_md = NULL;
	const char *errstr = NULL;

	if (single_execution) {
		if (pledge("stdio cpath wpath rpath inet dns tty", NULL) == -1) {
			perror("pledge");
			exit(1);
		}
	}

	args = argv + 1;
	reqnames = sk_OPENSSL_STRING_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, "-timeout")) {
			if (args[1]) {
				args++;
				req_timeout = strtonum(*args, 0,
				    INT_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal timeout value %s: %s\n",
					    *args, errstr);
					badarg = 1;
				}
			} 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, "-header")) {
			if (args[1] && args[2]) {
				if (!X509V3_add_value(args[1], args[2], &headers))
					goto end;
				args += 2;
			} 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 = strtonum(*args, 0, LONG_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal validity period %s: %s\n",
					    *args, errstr);
					badarg = 1;
				}
			} else
				badarg = 1;
		} else if (!strcmp(*args, "-status_age")) {
			if (args[1]) {
				args++;
				maxage = strtonum(*args, 0, LONG_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal validity age %s: %s\n",
					    *args, errstr);
					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, "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, "certificate");
				if (!cert)
					goto end;
				if (!cert_id_md)
					cert_id_md = EVP_sha1();
				if (!add_ocsp_cert(&req, cert, cert_id_md, issuer, ids))
					goto end;
				if (!sk_OPENSSL_STRING_push(reqnames, *args))
					goto end;
			} else
				badarg = 1;
		} else if (!strcmp(*args, "-serial")) {
			if (args[1]) {
				args++;
				if (!cert_id_md)
					cert_id_md = EVP_sha1();
				if (!add_ocsp_serial(&req, *args, cert_id_md, issuer, ids))
					goto end;
				if (!sk_OPENSSL_STRING_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 = strtonum(*args, 0, INT_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal update period %s: %s\n",
					    *args, errstr);
					badarg = 1;
				}
			}
			if (ndays == -1)
				ndays = 0;
			else
				badarg = 1;
		} else if (!strcmp(*args, "-nrequest")) {
			if (args[1]) {
				args++;
				accept_count = strtonum(*args, 0, INT_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal accept count %s: %s\n",
					    *args, errstr);
					badarg = 1;
				}
			} else
				badarg = 1;
		} else if (!strcmp(*args, "-ndays")) {
			if (args[1]) {
				args++;
				ndays = strtonum(*args, 0, INT_MAX, &errstr);
				if (errstr) {
					BIO_printf(bio_err,
					    "Illegal update period %s: %s\n",
					    *args, errstr);
					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 if ((cert_id_md = EVP_get_digestbyname((*args) + 1)) == NULL) {
			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");
		BIO_printf(bio_err, "-<dgst alg>     use specified digest in the request\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, "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, "CA certificate");
		if (rcertfile) {
			rother = load_certs(bio_err, rcertfile, FORMAT_PEM,
			    NULL, "responder other certificates");
			if (!rother)
				goto end;
		}
		rkey = load_key(bio_err, rkeyfile, FORMAT_PEM, 0, 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, "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, "signer certificates");
			if (!sign_other)
				goto end;
		}
		key = load_key(bio_err, keyfile, FORMAT_PEM, 0, NULL,
		    "signer private key");
		if (!key)
			goto end;

		if (!OCSP_request_sign(req, signer, key, NULL, 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) {
		resp = process_responder(bio_err, req, host, path,
		    port, use_ssl, headers, req_timeout);
		if (!resp)
			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(bio_err, "Responder Error: %s (%d)\n",
		    OCSP_response_status_str(i), i);
		if (ignore_err)
			goto redo_accept;
		ret = 1;
		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, "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_OPENSSL_STRING_free(reqnames);
	sk_OCSP_CERTID_free(ids);
	sk_X509_pop_free(sign_other, X509_free);
	sk_X509_pop_free(verify_other, X509_free);
	sk_CONF_VALUE_pop_free(headers, X509V3_conf_free);

	if (use_ssl != -1) {
		free(host);
		free(port);
		free(path);
	}
	return (ret);
}

static int
add_ocsp_cert(OCSP_REQUEST ** req, X509 * cert, const EVP_MD * cert_id_md, 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(cert_id_md, 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, const EVP_MD * cert_id_md, 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(cert_id_md, 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_OF(OPENSSL_STRING) * 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_OPENSSL_STRING_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_OPENSSL_STRING_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;
	}
	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;
		ASN1_OBJECT *cert_id_md_oid;
		const EVP_MD *cert_id_md;
		one = OCSP_request_onereq_get0(req, i);
		cid = OCSP_onereq_get0_id(one);

		OCSP_id_get0_info(NULL, &cert_id_md_oid, NULL, NULL, cid);

		cert_id_md = EVP_get_digestbyobj(cert_id_md_oid);
		if (!cert_id_md) {
			*resp = OCSP_response_create(OCSP_RESPONSE_STATUS_INTERNALERROR,
			    NULL);
			goto end;
		}
		if (ca_id)
			OCSP_CERTID_free(ca_id);
		ca_id = OCSP_cert_to_id(cert_id_md, NULL, ca);

		/* 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, NULL, 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);
	OPENSSL_assert(bn);	/* FIXME: should report an error at this
				 * point and abort */
	if (BN_is_zero(bn))
		itmp = 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);
	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;
	acbio = BIO_new_accept(port);
	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)
{
	static const 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;
}

static OCSP_RESPONSE *
query_responder(BIO * err, BIO * cbio, char *path,
    STACK_OF(CONF_VALUE) * headers,
    OCSP_REQUEST * req, int req_timeout)
{
	int fd;
	int rv;
	int i;
	OCSP_REQ_CTX *ctx = NULL;
	OCSP_RESPONSE *rsp = NULL;
	struct pollfd pfd[1];

	if (req_timeout != -1)
		BIO_set_nbio(cbio, 1);

	rv = BIO_do_connect(cbio);

	if ((rv <= 0) && ((req_timeout == -1) || !BIO_should_retry(cbio))) {
		BIO_puts(err, "Error connecting BIO\n");
		return NULL;
	}
	if (BIO_get_fd(cbio, &fd) < 0) {
		BIO_puts(err, "Can't get connection fd\n");
		goto err;
	}
	if (req_timeout != -1 && rv <= 0) {
		pfd[0].fd = fd;
		pfd[0].events = POLLOUT;
		rv = poll(pfd, 1, req_timeout * 1000);
		if (rv == 0) {
			BIO_puts(err, "Timeout on connect\n");
			return NULL;
		}
		if (rv == -1) {
			BIO_puts(err, "Poll error\n");
			return NULL;
		}
	}
	ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
	if (!ctx)
		return NULL;

	for (i = 0; i < sk_CONF_VALUE_num(headers); i++) {
		CONF_VALUE *hdr = sk_CONF_VALUE_value(headers, i);
		if (!OCSP_REQ_CTX_add1_header(ctx, hdr->name, hdr->value))
			goto err;
	}

	if (!OCSP_REQ_CTX_set1_req(ctx, req))
		goto err;

	for (;;) {
		rv = OCSP_sendreq_nbio(&rsp, ctx);
		if (rv != -1)
			break;
		if (req_timeout == -1)
			continue;
		pfd[0].fd = fd;
		if (BIO_should_read(cbio))
			pfd[0].events = POLLIN;
		else if (BIO_should_write(cbio))
			pfd[0].events = POLLOUT;
		else {
			BIO_puts(err, "Unexpected retry condition\n");
			goto err;
		}
		rv = poll(pfd, 1, req_timeout * 1000);
		if (rv == 0) {
			BIO_puts(err, "Timeout on request\n");
			break;
		}
		if (rv == -1 || (pfd[0].revents & (POLLERR|POLLNVAL))) {
			BIO_puts(err, "Poll error\n");
			break;
		}
	}
err:
	if (ctx)
		OCSP_REQ_CTX_free(ctx);

	return rsp;
}

OCSP_RESPONSE *
process_responder(BIO * err, OCSP_REQUEST * req,
    char *host, char *path, char *port, int use_ssl,
    STACK_OF(CONF_VALUE) * headers,
    int req_timeout)
{
	BIO *cbio = NULL;
	SSL_CTX *ctx = NULL;
	OCSP_RESPONSE *resp = NULL;
	cbio = BIO_new_connect(host);
	if (!cbio) {
		BIO_printf(err, "Error creating connect BIO\n");
		goto end;
	}
	if (port)
		BIO_set_conn_port(cbio, port);
	if (use_ssl == 1) {
		BIO *sbio;
		ctx = SSL_CTX_new(SSLv23_client_method());
		if (ctx == NULL) {
			BIO_printf(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);
	}
	resp = query_responder(err, cbio, path, headers, req, req_timeout);
	if (!resp)
		BIO_printf(bio_err, "Error querying OCSP responder\n");
end:
	if (cbio)
		BIO_free_all(cbio);
	if (ctx)
		SSL_CTX_free(ctx);
	return resp;
}

#endif
