Return to s_cb.c CVS log

Up to [local] / src / usr.bin / openssl

Drop policy printing from openssl

Nothing really uses the policy tree. It's desgined with built-in DoS
capabilities directly from the RFC. It will be removed from the attack
surface and replaced with something equivalent that doesn't grow
exponentially with the depth.

This removes the only reason the policy tree itself ever leaked out of
the library.

ok jsing

/* $OpenBSD: s_cb.c,v 1.21 2023/04/14 15:27:13 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2006 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 <sys/socket.h>

#include <netinet/in.h>

#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "apps.h"

#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>

#include "s_apps.h"

#define	COOKIE_SECRET_LENGTH	16

int verify_depth = 0;
int verify_return_error = 0;
unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
int cookie_initialized = 0;

int
verify_callback(int ok, X509_STORE_CTX * ctx)
{
	X509 *err_cert;
	int err, depth;

	err_cert = X509_STORE_CTX_get_current_cert(ctx);
	err = X509_STORE_CTX_get_error(ctx);
	depth = X509_STORE_CTX_get_error_depth(ctx);

	BIO_printf(bio_err, "depth=%d ", depth);
	if (err_cert) {
		X509_NAME_print_ex(bio_err, X509_get_subject_name(err_cert),
		    0, XN_FLAG_ONELINE);
		BIO_puts(bio_err, "\n");
	} else
		BIO_puts(bio_err, "<no cert>\n");
	if (!ok) {
		BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
		    X509_verify_cert_error_string(err));
		if (verify_depth >= depth) {
			if (!verify_return_error)
				ok = 1;
		} else {
			ok = 0;
		}
	}
	switch (err) {
	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
		BIO_puts(bio_err, "issuer= ");
		if (err_cert == NULL)
			BIO_puts(bio_err, "<error getting cert>");
		else
			X509_NAME_print_ex(bio_err,
			    X509_get_issuer_name(err_cert), 0, XN_FLAG_ONELINE);
		BIO_puts(bio_err, "\n");
		break;
	case X509_V_ERR_CERT_NOT_YET_VALID:
	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
		BIO_printf(bio_err, "notBefore=");
		if (err_cert == NULL)
			BIO_printf(bio_err, " <error getting cert>");
		else
			ASN1_TIME_print(bio_err, X509_get_notBefore(err_cert));
		BIO_printf(bio_err, "\n");
		break;
	case X509_V_ERR_CERT_HAS_EXPIRED:
	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
		BIO_printf(bio_err, "notAfter=");
		if (err_cert == NULL)
			BIO_printf(bio_err, " <error getting cert>");
		else
			ASN1_TIME_print(bio_err, X509_get_notAfter(err_cert));
		BIO_printf(bio_err, "\n");
		break;
	case X509_V_ERR_NO_EXPLICIT_POLICY:
		break;
	}

	BIO_printf(bio_err, "verify return:%d\n", ok);
	return (ok);
}

int
set_cert_stuff(SSL_CTX * ctx, char *cert_file, char *key_file)
{
	if (cert_file == NULL)
		return 1;

	if (key_file == NULL)
		key_file = cert_file;

	if (SSL_CTX_use_certificate_file(ctx, cert_file, SSL_FILETYPE_PEM) <= 0) {
		BIO_printf(bio_err,
		    "unable to get certificate from '%s'\n", cert_file);
		ERR_print_errors(bio_err);
		return 0;
	}
	if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0) {
		BIO_printf(bio_err, "unable to get private key from '%s'\n",
		    key_file);
		ERR_print_errors(bio_err);
		return 0;
	}

	/* Now we know that a key and cert have been set against the context. */
	if (!SSL_CTX_check_private_key(ctx)) {
		BIO_printf(bio_err,
		    "Private key does not match the certificate public key\n");
		return 0;
	}

	return 1;
}

int
set_cert_key_stuff(SSL_CTX * ctx, X509 * cert, EVP_PKEY * key)
{
	if (cert == NULL)
		return 1;
	if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
		BIO_printf(bio_err, "error setting certificate\n");
		ERR_print_errors(bio_err);
		return 0;
	}
	if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
		BIO_printf(bio_err, "error setting private key\n");
		ERR_print_errors(bio_err);
		return 0;
	}
	/*
	 * Now we know that a key and cert have been set against the SSL
	 * context
	 */
	if (!SSL_CTX_check_private_key(ctx)) {
		BIO_printf(bio_err,
		    "Private key does not match the certificate public key\n");
		return 0;
	}
	return 1;
}

int
ssl_print_tmp_key(BIO *out, SSL *s)
{
	const char *cname;
	EVP_PKEY *pkey;
	EC_KEY *ec;
	const EC_GROUP *group;
	int nid;

	if (!SSL_get_server_tmp_key(s, &pkey))
		return 0;

	BIO_puts(out, "Server Temp Key: ");
	switch (EVP_PKEY_id(pkey)) {
	case EVP_PKEY_DH:
		BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(pkey));
		break;

	case EVP_PKEY_EC:
		if ((ec = EVP_PKEY_get0_EC_KEY(pkey)) == NULL)
			goto err;
		if ((group = EC_KEY_get0_group(ec)) == NULL)
			goto err;

		nid = EC_GROUP_get_curve_name(group);

		if ((cname = EC_curve_nid2nist(nid)) == NULL)
			cname = OBJ_nid2sn(nid);

		BIO_printf(out, "ECDH, %s, %d bits\n", cname, EVP_PKEY_bits(pkey));
		break;

	default:
		BIO_printf(out, "%s, %d bits\n", OBJ_nid2sn(EVP_PKEY_id(pkey)),
		    EVP_PKEY_bits(pkey));
	}

 err:
	EVP_PKEY_free(pkey);
	return 1;
}

long
bio_dump_callback(BIO * bio, int cmd, const char *argp,
    int argi, long argl, long ret)
{
	BIO *out;

	out = (BIO *) BIO_get_callback_arg(bio);
	if (out == NULL)
		return (ret);

	if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
		BIO_printf(out,
		    "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
		    (void *) bio, argp, (unsigned long) argi, ret, ret);
		BIO_dump(out, argp, (int) ret);
		return (ret);
	} else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
		BIO_printf(out,
		    "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
		    (void *) bio, argp, (unsigned long) argi, ret, ret);
		BIO_dump(out, argp, (int) ret);
	}
	return (ret);
}

void
apps_ssl_info_callback(const SSL * s, int where, int ret)
{
	const char *str;
	int w;

	w = where & ~SSL_ST_MASK;

	if (w & SSL_ST_CONNECT)
		str = "SSL_connect";
	else if (w & SSL_ST_ACCEPT)
		str = "SSL_accept";
	else
		str = "undefined";

	if (where & SSL_CB_LOOP) {
		BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
	} else if (where & SSL_CB_ALERT) {
		str = (where & SSL_CB_READ) ? "read" : "write";
		BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n", str,
		    SSL_alert_type_string_long(ret),
		    SSL_alert_desc_string_long(ret));
	} else if (where & SSL_CB_EXIT) {
		if (ret == 0)
			BIO_printf(bio_err, "%s:failed in %s\n",
			    str, SSL_state_string_long(s));
		else if (ret < 0) {
			BIO_printf(bio_err, "%s:error in %s\n",
			    str, SSL_state_string_long(s));
		}
	}
}


void
msg_cb(int write_p, int version, int content_type, const void *buf, size_t len, SSL * ssl, void *arg)
{
	BIO *bio = arg;
	const char *str_write_p, *str_version, *str_content_type = "",
	    *str_details1 = "", *str_details2 = "";

	str_write_p = write_p ? ">>>" : "<<<";

	/* XXX convert to using ssl_get_version */
	switch (version) {
	case SSL2_VERSION:
		str_version = "SSL 2.0";
		break;
	case SSL3_VERSION:
		str_version = "SSL 3.0 ";
		break;
	case TLS1_VERSION:
		str_version = "TLS 1.0 ";
		break;
	case TLS1_1_VERSION:
		str_version = "TLS 1.1 ";
		break;
	case TLS1_2_VERSION:
		str_version = "TLS 1.2 ";
		break;
	case TLS1_3_VERSION:
		str_version = "TLS 1.3 ";
		break;
	case DTLS1_VERSION:
		str_version = "DTLS 1.0 ";
		break;
	case DTLS1_2_VERSION:
		str_version = "DTLS 1.2 ";
		break;
	default:
		str_version = "???";
	}

	if (version == SSL2_VERSION) {
		str_details1 = "???";

		if (len > 0) {
			/* XXX magic numbers */
			switch (((const unsigned char *) buf)[0]) {
			case 0:
				str_details1 = ", ERROR:";
				str_details2 = " ???";
				if (len >= 3) {
					unsigned err = (((const unsigned char *) buf)[1] << 8) + ((const unsigned char *) buf)[2];

					switch (err) {
					case 0x0001:
						str_details2 = " NO-CIPHER-ERROR";
						break;
					case 0x0002:
						str_details2 = " NO-CERTIFICATE-ERROR";
						break;
					case 0x0004:
						str_details2 = " BAD-CERTIFICATE-ERROR";
						break;
					case 0x0006:
						str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
						break;
					}
				}
				break;
			case 1:
				str_details1 = ", CLIENT-HELLO";
				break;
			case 2:
				str_details1 = ", CLIENT-MASTER-KEY";
				break;
			case 3:
				str_details1 = ", CLIENT-FINISHED";
				break;
			case 4:
				str_details1 = ", SERVER-HELLO";
				break;
			case 5:
				str_details1 = ", SERVER-VERIFY";
				break;
			case 6:
				str_details1 = ", SERVER-FINISHED";
				break;
			case 7:
				str_details1 = ", REQUEST-CERTIFICATE";
				break;
			case 8:
				str_details1 = ", CLIENT-CERTIFICATE";
				break;
			}
		}
	}
	if (version == SSL3_VERSION || version == TLS1_VERSION ||
	    version == TLS1_1_VERSION || version == TLS1_2_VERSION ||
	    version == TLS1_3_VERSION || version == DTLS1_VERSION ||
	    version == DTLS1_2_VERSION) {
		/* XXX magic numbers are in ssl3.h */
		switch (content_type) {
		case 20:
			str_content_type = "ChangeCipherSpec";
			break;
		case 21:
			str_content_type = "Alert";
			break;
		case 22:
			str_content_type = "Handshake";
			break;
		}

		if (content_type == 21) {	/* Alert */
			str_details1 = ", ???";

			if (len == 2) {
				switch (((const unsigned char *) buf)[0]) {
				case 1:
					str_details1 = ", warning";
					break;
				case 2:
					str_details1 = ", fatal";
					break;
				}

				str_details2 = " ???";
				switch (((const unsigned char *) buf)[1]) {
				case 0:
					str_details2 = " close_notify";
					break;
				case 10:
					str_details2 = " unexpected_message";
					break;
				case 20:
					str_details2 = " bad_record_mac";
					break;
				case 21:
					str_details2 = " decryption_failed";
					break;
				case 22:
					str_details2 = " record_overflow";
					break;
				case 30:
					str_details2 = " decompression_failure";
					break;
				case 40:
					str_details2 = " handshake_failure";
					break;
				case 42:
					str_details2 = " bad_certificate";
					break;
				case 43:
					str_details2 = " unsupported_certificate";
					break;
				case 44:
					str_details2 = " certificate_revoked";
					break;
				case 45:
					str_details2 = " certificate_expired";
					break;
				case 46:
					str_details2 = " certificate_unknown";
					break;
				case 47:
					str_details2 = " illegal_parameter";
					break;
				case 48:
					str_details2 = " unknown_ca";
					break;
				case 49:
					str_details2 = " access_denied";
					break;
				case 50:
					str_details2 = " decode_error";
					break;
				case 51:
					str_details2 = " decrypt_error";
					break;
				case 60:
					str_details2 = " export_restriction";
					break;
				case 70:
					str_details2 = " protocol_version";
					break;
				case 71:
					str_details2 = " insufficient_security";
					break;
				case 80:
					str_details2 = " internal_error";
					break;
				case 90:
					str_details2 = " user_canceled";
					break;
				case 100:
					str_details2 = " no_renegotiation";
					break;
				case 110:
					str_details2 = " unsupported_extension";
					break;
				case 111:
					str_details2 = " certificate_unobtainable";
					break;
				case 112:
					str_details2 = " unrecognized_name";
					break;
				case 113:
					str_details2 = " bad_certificate_status_response";
					break;
				case 114:
					str_details2 = " bad_certificate_hash_value";
					break;
				case 115:
					str_details2 = " unknown_psk_identity";
					break;
				}
			}
		}
		if (content_type == 22) {	/* Handshake */
			str_details1 = "???";

			if (len > 0) {
				switch (((const unsigned char *) buf)[0]) {
				case 0:
					str_details1 = ", HelloRequest";
					break;
				case 1:
					str_details1 = ", ClientHello";
					break;
				case 2:
					str_details1 = ", ServerHello";
					break;
				case 3:
					str_details1 = ", HelloVerifyRequest";
					break;
				case 4:
					str_details1 = ", NewSessionTicket";
					break;
				case 5:
					str_details1 = ", EndOfEarlyData";
					break;
				case 8:
					str_details1 = ", EncryptedExtensions";
					break;
				case 11:
					str_details1 = ", Certificate";
					break;
				case 12:
					str_details1 = ", ServerKeyExchange";
					break;
				case 13:
					str_details1 = ", CertificateRequest";
					break;
				case 14:
					str_details1 = ", ServerHelloDone";
					break;
				case 15:
					str_details1 = ", CertificateVerify";
					break;
				case 16:
					str_details1 = ", ClientKeyExchange";
					break;
				case 20:
					str_details1 = ", Finished";
					break;
				case 24:
					str_details1 = ", KeyUpdate";
					break;
				}
			}
		}
	}
	BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p,
	    str_version, str_content_type, (unsigned long) len,
	    str_details1, str_details2);

	if (len > 0) {
		size_t num, i;

		BIO_printf(bio, "   ");
		num = len;

		for (i = 0; i < num; i++) {
			if (i % 16 == 0 && i > 0)
				BIO_printf(bio, "\n   ");
			BIO_printf(bio, " %02x",
			    ((const unsigned char *) buf)[i]);
		}
		if (i < len)
			BIO_printf(bio, " ...");
		BIO_printf(bio, "\n");
	}
	(void) BIO_flush(bio);
}

void
tlsext_cb(SSL * s, int client_server, int type, unsigned char *data, int len,
    void *arg)
{
	BIO *bio = arg;
	char *extname;

	switch (type) {
	case TLSEXT_TYPE_server_name:
		extname = "server name";
		break;

	case TLSEXT_TYPE_max_fragment_length:
		extname = "max fragment length";
		break;

	case TLSEXT_TYPE_client_certificate_url:
		extname = "client certificate URL";
		break;

	case TLSEXT_TYPE_trusted_ca_keys:
		extname = "trusted CA keys";
		break;

	case TLSEXT_TYPE_truncated_hmac:
		extname = "truncated HMAC";
		break;

	case TLSEXT_TYPE_status_request:
		extname = "status request";
		break;

	case TLSEXT_TYPE_user_mapping:
		extname = "user mapping";
		break;

	case TLSEXT_TYPE_client_authz:
		extname = "client authz";
		break;

	case TLSEXT_TYPE_server_authz:
		extname = "server authz";
		break;

	case TLSEXT_TYPE_cert_type:
		extname = "cert type";
		break;

	case TLSEXT_TYPE_supported_groups:
		extname = "supported groups";
		break;

	case TLSEXT_TYPE_ec_point_formats:
		extname = "EC point formats";
		break;

	case TLSEXT_TYPE_srp:
		extname = "SRP";
		break;

	case TLSEXT_TYPE_signature_algorithms:
		extname = "signature algorithms";
		break;

	case TLSEXT_TYPE_use_srtp:
		extname = "use SRTP";
		break;

	case TLSEXT_TYPE_heartbeat:
		extname = "heartbeat";
		break;

	case TLSEXT_TYPE_application_layer_protocol_negotiation:
		extname = "application layer protocol negotiation";
		break;

	case TLSEXT_TYPE_padding:
		extname = "TLS padding";
		break;

	case TLSEXT_TYPE_session_ticket:
		extname = "session ticket";
		break;

#if defined(LIBRESSL_HAS_TLS1_3) || defined(LIBRESSL_INTERNAL)
	case TLSEXT_TYPE_pre_shared_key:
		extname = "pre shared key";
		break;

	case TLSEXT_TYPE_early_data:
		extname = "early data";
		break;

	case TLSEXT_TYPE_supported_versions:
		extname = "supported versions";
		break;

	case TLSEXT_TYPE_cookie:
		extname = "cookie";
		break;

	case TLSEXT_TYPE_psk_key_exchange_modes:
		extname = "PSK key exchange modes";
		break;

	case TLSEXT_TYPE_certificate_authorities:
		extname = "certificate authorities";
		break;

	case TLSEXT_TYPE_oid_filters:
		extname = "OID filters";
		break;

	case TLSEXT_TYPE_post_handshake_auth:
		extname = "post handshake auth";
		break;

	case TLSEXT_TYPE_signature_algorithms_cert:
		extname = "signature algorithms cert";
		break;

	case TLSEXT_TYPE_key_share:
		extname = "key share";
		break;
#endif

	case TLSEXT_TYPE_renegotiate:
		extname = "renegotiation info";
		break;

	default:
		extname = "unknown";
		break;

	}

	BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
	    client_server ? "server" : "client", extname, type, len);
	BIO_dump(bio, (char *) data, len);
	(void) BIO_flush(bio);
}

int
generate_cookie_callback(SSL * ssl, unsigned char *cookie,
    unsigned int *cookie_len)
{
	unsigned char *buffer, result[EVP_MAX_MD_SIZE];
	unsigned int length, resultlength;
	union {
		struct sockaddr sa;
		struct sockaddr_in s4;
		struct sockaddr_in6 s6;
	} peer;

	/* Initialize a random secret */
	if (!cookie_initialized) {
		arc4random_buf(cookie_secret, COOKIE_SECRET_LENGTH);
		cookie_initialized = 1;
	}
	/* Read peer information */
	(void) BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);

	/* Create buffer with peer's address and port */
	length = 0;
	switch (peer.sa.sa_family) {
	case AF_INET:
		length += sizeof(struct in_addr);
		length += sizeof(peer.s4.sin_port);
		break;
	case AF_INET6:
		length += sizeof(struct in6_addr);
		length += sizeof(peer.s6.sin6_port);
		break;
	default:
		OPENSSL_assert(0);
		break;
	}
	buffer = malloc(length);

	if (buffer == NULL) {
		BIO_printf(bio_err, "out of memory\n");
		return 0;
	}
	switch (peer.sa.sa_family) {
	case AF_INET:
		memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
		memcpy(buffer + sizeof(peer.s4.sin_port),
		    &peer.s4.sin_addr, sizeof(struct in_addr));
		break;
	case AF_INET6:
		memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
		memcpy(buffer + sizeof(peer.s6.sin6_port),
		    &peer.s6.sin6_addr, sizeof(struct in6_addr));
		break;
	default:
		OPENSSL_assert(0);
		break;
	}

	/* Calculate HMAC of buffer using the secret */
	HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
	    buffer, length, result, &resultlength);
	free(buffer);

	memcpy(cookie, result, resultlength);
	*cookie_len = resultlength;

	return 1;
}

int
verify_cookie_callback(SSL * ssl, const unsigned char *cookie,
    unsigned int cookie_len)
{
	unsigned char *buffer, result[EVP_MAX_MD_SIZE];
	unsigned int length, resultlength;
	union {
		struct sockaddr sa;
		struct sockaddr_in s4;
		struct sockaddr_in6 s6;
	} peer;

	/* If secret isn't initialized yet, the cookie can't be valid */
	if (!cookie_initialized)
		return 0;

	/* Read peer information */
	(void) BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);

	/* Create buffer with peer's address and port */
	length = 0;
	switch (peer.sa.sa_family) {
	case AF_INET:
		length += sizeof(struct in_addr);
		length += sizeof(peer.s4.sin_port);
		break;
	case AF_INET6:
		length += sizeof(struct in6_addr);
		length += sizeof(peer.s6.sin6_port);
		break;
	default:
		OPENSSL_assert(0);
		break;
	}
	buffer = malloc(length);

	if (buffer == NULL) {
		BIO_printf(bio_err, "out of memory\n");
		return 0;
	}
	switch (peer.sa.sa_family) {
	case AF_INET:
		memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
		memcpy(buffer + sizeof(peer.s4.sin_port),
		    &peer.s4.sin_addr, sizeof(struct in_addr));
		break;
	case AF_INET6:
		memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
		memcpy(buffer + sizeof(peer.s6.sin6_port),
		    &peer.s6.sin6_addr, sizeof(struct in6_addr));
		break;
	default:
		OPENSSL_assert(0);
		break;
	}

	/* Calculate HMAC of buffer using the secret */
	if (HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
	    buffer, length, result, &resultlength) == NULL) {
		free(buffer);
		return 0;
	}

	free(buffer);

	if (cookie_len == resultlength &&
	    memcmp(result, cookie, resultlength) == 0)
		return 1;

	return 0;
}