Initial import

1 files changed, 1142 insertions, 0 deletions

diff --git a/openssl/ssl/s2_srvr.c b/openssl/ssl/s2_srvr.c
new file mode 100644
index 00000000..bc885e8e
--- /dev/null
+++ b/openssl/ssl/s2_srvr.c
@@ -0,0 +1,1142 @@
+/* ssl/s2_srvr.c */
+/* 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) 1998-2001 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include "ssl_locl.h"
+#ifndef OPENSSL_NO_SSL2
+#include <stdio.h>
+#include <openssl/bio.h>
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+
+static const SSL_METHOD *ssl2_get_server_method(int ver);
+static int get_client_master_key(SSL *s);
+static int get_client_hello(SSL *s);
+static int server_hello(SSL *s); 
+static int get_client_finished(SSL *s);
+static int server_verify(SSL *s);
+static int server_finish(SSL *s);
+static int request_certificate(SSL *s);
+static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
+	unsigned char *to,int padding);
+#define BREAK	break
+
+static const SSL_METHOD *ssl2_get_server_method(int ver)
+	{
+	if (ver == SSL2_VERSION)
+		return(SSLv2_server_method());
+	else
+		return(NULL);
+	}
+
+IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
+			ssl2_accept,
+			ssl_undefined_function,
+			ssl2_get_server_method)
+
+int ssl2_accept(SSL *s)
+	{
+	unsigned long l=(unsigned long)time(NULL);
+	BUF_MEM *buf=NULL;
+	int ret= -1;
+	long num1;
+	void (*cb)(const SSL *ssl,int type,int val)=NULL;
+	int new_state,state;
+
+	RAND_add(&l,sizeof(l),0);
+	ERR_clear_error();
+	clear_sys_error();
+
+	if (s->info_callback != NULL)
+		cb=s->info_callback;
+	else if (s->ctx->info_callback != NULL)
+		cb=s->ctx->info_callback;
+
+	/* init things to blank */
+	s->in_handshake++;
+	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
+
+	if (s->cert == NULL)
+		{
+		SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
+		return(-1);
+		}
+
+	clear_sys_error();
+	for (;;)
+		{
+		state=s->state;
+
+		switch (s->state)
+			{
+		case SSL_ST_BEFORE:
+		case SSL_ST_ACCEPT:
+		case SSL_ST_BEFORE|SSL_ST_ACCEPT:
+		case SSL_ST_OK|SSL_ST_ACCEPT:
+
+			s->server=1;
+			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
+
+			s->version=SSL2_VERSION;
+			s->type=SSL_ST_ACCEPT;
+
+			buf=s->init_buf;
+			if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
+				{ ret= -1; goto end; }
+			if (!BUF_MEM_grow(buf,(int)
+				SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
+				{ ret= -1; goto end; }
+			s->init_buf=buf;
+			s->init_num=0;
+			s->ctx->stats.sess_accept++;
+			s->handshake_func=ssl2_accept;
+			s->state=SSL2_ST_GET_CLIENT_HELLO_A;
+			BREAK;
+
+		case SSL2_ST_GET_CLIENT_HELLO_A:
+		case SSL2_ST_GET_CLIENT_HELLO_B:
+		case SSL2_ST_GET_CLIENT_HELLO_C:
+			s->shutdown=0;
+			ret=get_client_hello(s);
+			if (ret <= 0) goto end;
+			s->init_num=0;
+			s->state=SSL2_ST_SEND_SERVER_HELLO_A;
+			BREAK;
+
+		case SSL2_ST_SEND_SERVER_HELLO_A:
+		case SSL2_ST_SEND_SERVER_HELLO_B:
+			ret=server_hello(s);
+			if (ret <= 0) goto end;
+			s->init_num=0;
+			if (!s->hit)
+				{
+				s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
+				BREAK;
+				}
+			else
+				{
+				s->state=SSL2_ST_SERVER_START_ENCRYPTION;
+				BREAK;
+				}
+		case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
+		case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
+			ret=get_client_master_key(s);
+			if (ret <= 0) goto end;
+			s->init_num=0;
+			s->state=SSL2_ST_SERVER_START_ENCRYPTION;
+			BREAK;
+
+		case SSL2_ST_SERVER_START_ENCRYPTION:
+			/* Ok we how have sent all the stuff needed to
+			 * start encrypting, the next packet back will
+			 * be encrypted. */
+			if (!ssl2_enc_init(s,0))
+				{ ret= -1; goto end; }
+			s->s2->clear_text=0;
+			s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
+			BREAK;
+
+		case SSL2_ST_SEND_SERVER_VERIFY_A:
+		case SSL2_ST_SEND_SERVER_VERIFY_B:
+			ret=server_verify(s);
+			if (ret <= 0) goto end;
+			s->init_num=0;
+			if (s->hit)
+				{
+				/* If we are in here, we have been
+				 * buffering the output, so we need to
+				 * flush it and remove buffering from
+				 * future traffic */
+				s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
+				BREAK;
+				}
+			else
+				{
+				s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
+				break;
+				}
+
+ 		case SSL2_ST_SEND_SERVER_VERIFY_C:
+ 			/* get the number of bytes to write */
+ 			num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
+ 			if (num1 > 0)
+ 				{
+				s->rwstate=SSL_WRITING;
+ 				num1=BIO_flush(s->wbio);
+ 				if (num1 <= 0) { ret= -1; goto end; }
+				s->rwstate=SSL_NOTHING;
+				}
+
+ 			/* flushed and now remove buffering */
+ 			s->wbio=BIO_pop(s->wbio);
+
+ 			s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
+  			BREAK;
+
+		case SSL2_ST_GET_CLIENT_FINISHED_A:
+		case SSL2_ST_GET_CLIENT_FINISHED_B:
+			ret=get_client_finished(s);
+			if (ret <= 0)
+				goto end;
+			s->init_num=0;
+			s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
+			BREAK;
+
+		case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
+		case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
+		case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
+		case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
+			/* don't do a 'request certificate' if we
+			 * don't want to, or we already have one, and
+			 * we only want to do it once. */
+			if (!(s->verify_mode & SSL_VERIFY_PEER) ||
+				((s->session->peer != NULL) &&
+				(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
+				{
+				s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
+				break;
+				}
+			else
+				{
+				ret=request_certificate(s);
+				if (ret <= 0) goto end;
+				s->init_num=0;
+				s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
+				}
+			BREAK;
+
+		case SSL2_ST_SEND_SERVER_FINISHED_A:
+		case SSL2_ST_SEND_SERVER_FINISHED_B:
+			ret=server_finish(s);
+			if (ret <= 0) goto end;
+			s->init_num=0;
+			s->state=SSL_ST_OK;
+			break;
+
+		case SSL_ST_OK:
+			BUF_MEM_free(s->init_buf);
+			ssl_free_wbio_buffer(s);
+			s->init_buf=NULL;
+			s->init_num=0;
+		/*	ERR_clear_error();*/
+
+			ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
+
+			s->ctx->stats.sess_accept_good++;
+			/* s->server=1; */
+			ret=1;
+
+			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
+
+			goto end;
+			/* BREAK; */
+
+		default:
+			SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
+			ret= -1;
+			goto end;
+			/* BREAK; */
+			}
+		
+		if ((cb != NULL) && (s->state != state))
+			{
+			new_state=s->state;
+			s->state=state;
+			cb(s,SSL_CB_ACCEPT_LOOP,1);
+			s->state=new_state;
+			}
+		}
+end:
+	s->in_handshake--;
+	if (cb != NULL)
+		cb(s,SSL_CB_ACCEPT_EXIT,ret);
+	return(ret);
+	}
+
+static int get_client_master_key(SSL *s)
+	{
+	int is_export,i,n,keya,ek;
+	unsigned long len;
+	unsigned char *p;
+	const SSL_CIPHER *cp;
+	const EVP_CIPHER *c;
+	const EVP_MD *md;
+
+	p=(unsigned char *)s->init_buf->data;
+	if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
+		{
+		i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
+
+		if (i < (10-s->init_num))
+			return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
+		s->init_num = 10;
+
+		if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
+			{
+			if (p[-1] != SSL2_MT_ERROR)
+				{
+				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+				SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
+				}
+			else
+				SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
+			return(-1);
+			}
+
+		cp=ssl2_get_cipher_by_char(p);
+		if (cp == NULL)
+			{
+			ssl2_return_error(s,SSL2_PE_NO_CIPHER);
+			SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
+			return(-1);
+			}
+		s->session->cipher= cp;
+
+		p+=3;
+		n2s(p,i); s->s2->tmp.clear=i;
+		n2s(p,i); s->s2->tmp.enc=i;
+		n2s(p,i);
+		if(i > SSL_MAX_KEY_ARG_LENGTH)
+			{
+			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+			SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
+			return -1;
+			}
+		s->session->key_arg_length=i;
+		s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
+		}
+
+	/* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
+	p=(unsigned char *)s->init_buf->data;
+	if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
+		return -1;
+		}
+	keya=s->session->key_arg_length;
+	len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
+	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
+		return -1;
+		}
+	n = (int)len - s->init_num;
+	i = ssl2_read(s,(char *)&(p[s->init_num]),n);
+	if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
+	if (s->msg_callback)
+		s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
+	p += 10;
+
+	memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
+		(unsigned int)keya);
+
+	if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
+		return(-1);
+		}
+	i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
+		&(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
+		(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
+
+	is_export=SSL_C_IS_EXPORT(s->session->cipher);
+	
+	if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
+		{
+		ssl2_return_error(s,SSL2_PE_NO_CIPHER);
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
+		return(0);
+		}
+
+	if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
+		{
+		is_export=1;
+		ek=8;
+		}
+	else
+		ek=5;
+
+	/* bad decrypt */
+#if 1
+	/* If a bad decrypt, continue with protocol but with a
+	 * random master secret (Bleichenbacher attack) */
+	if ((i < 0) ||
+		((!is_export && (i != EVP_CIPHER_key_length(c)))
+		|| (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
+			(unsigned int)EVP_CIPHER_key_length(c))))))
+		{
+		ERR_clear_error();
+		if (is_export)
+			i=ek;
+		else
+			i=EVP_CIPHER_key_length(c);
+		if (RAND_pseudo_bytes(p,i) <= 0)
+			return 0;
+		}
+#else
+	if (i < 0)
+		{
+		error=1;
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
+		}
+	/* incorrect number of key bytes for non export cipher */
+	else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
+		|| (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
+			EVP_CIPHER_key_length(c)))))
+		{
+		error=1;
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
+		}
+	if (error)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		return(-1);
+		}
+#endif
+
+	if (is_export) i+=s->s2->tmp.clear;
+
+	if (i > SSL_MAX_MASTER_KEY_LENGTH)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
+		return -1;
+		}
+	s->session->master_key_length=i;
+	memcpy(s->session->master_key,p,(unsigned int)i);
+	return(1);
+	}
+
+static int get_client_hello(SSL *s)
+	{
+	int i,n;
+	unsigned long len;
+	unsigned char *p;
+	STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
+	STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
+	STACK_OF(SSL_CIPHER) *prio, *allow;
+	int z;
+
+	/* This is a bit of a hack to check for the correct packet
+	 * type the first time round. */
+	if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
+		{
+		s->first_packet=1;
+		s->state=SSL2_ST_GET_CLIENT_HELLO_B;
+		}
+
+	p=(unsigned char *)s->init_buf->data;
+	if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
+		{
+		i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
+		if (i < (9-s->init_num)) 
+			return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
+		s->init_num = 9;
+	
+		if (*(p++) != SSL2_MT_CLIENT_HELLO)
+			{
+			if (p[-1] != SSL2_MT_ERROR)
+				{
+				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
+				}
+			else
+				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
+			return(-1);
+			}
+		n2s(p,i);
+		if (i < s->version) s->version=i;
+		n2s(p,i); s->s2->tmp.cipher_spec_length=i;
+		n2s(p,i); s->s2->tmp.session_id_length=i;
+		n2s(p,i); s->s2->challenge_length=i;
+		if (	(i < SSL2_MIN_CHALLENGE_LENGTH) ||
+			(i > SSL2_MAX_CHALLENGE_LENGTH))
+			{
+			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+			SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
+			return(-1);
+			}
+		s->state=SSL2_ST_GET_CLIENT_HELLO_C;
+		}
+
+	/* SSL2_ST_GET_CLIENT_HELLO_C */
+	p=(unsigned char *)s->init_buf->data;
+	len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
+	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
+		return -1;
+		}
+	n = (int)len - s->init_num;
+	i = ssl2_read(s,(char *)&(p[s->init_num]),n);
+	if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
+	if (s->msg_callback)
+		s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
+	p += 9;
+
+	/* get session-id before cipher stuff so we can get out session
+	 * structure if it is cached */
+	/* session-id */
+	if ((s->s2->tmp.session_id_length != 0) && 
+		(s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
+		return(-1);
+		}
+
+	if (s->s2->tmp.session_id_length == 0)
+		{
+		if (!ssl_get_new_session(s,1))
+			{
+			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+			return(-1);
+			}
+		}
+	else
+		{
+		i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
+			s->s2->tmp.session_id_length, NULL);
+		if (i == 1)
+			{ /* previous session */
+			s->hit=1;
+			}
+		else if (i == -1)
+			{
+			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+			return(-1);
+			}
+		else
+			{
+			if (s->cert == NULL)
+				{
+				ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
+				SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
+				return(-1);
+				}
+
+			if (!ssl_get_new_session(s,1))
+				{
+				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+				return(-1);
+				}
+			}
+		}
+
+	if (!s->hit)
+		{
+		cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
+			&s->session->ciphers);
+		if (cs == NULL) goto mem_err;
+
+		cl=SSL_get_ciphers(s);
+
+		if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
+		    {
+		    prio=sk_SSL_CIPHER_dup(cl);
+		    if (prio == NULL) goto mem_err;
+		    allow = cs;
+		    }
+		else
+		    {
+		    prio = cs;
+		    allow = cl;
+		    }
+		for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
+			{
+			if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
+				{
+				(void)sk_SSL_CIPHER_delete(prio,z);
+				z--;
+				}
+			}
+		if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
+		    {
+		    sk_SSL_CIPHER_free(s->session->ciphers);
+		    s->session->ciphers = prio;
+		    }
+		/* s->session->ciphers should now have a list of
+		 * ciphers that are on both the client and server.
+		 * This list is ordered by the order the client sent
+		 * the ciphers or in the order of the server's preference
+		 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
+		 */
+		}
+	p+=s->s2->tmp.cipher_spec_length;
+	/* done cipher selection */
+
+	/* session id extracted already */
+	p+=s->s2->tmp.session_id_length;
+
+	/* challenge */
+	if (s->s2->challenge_length > sizeof s->s2->challenge)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
+		return -1;
+		}
+	memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
+	return(1);
+mem_err:
+	SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
+	return(0);
+	}
+
+static int server_hello(SSL *s)
+	{
+	unsigned char *p,*d;
+	int n,hit;
+
+	p=(unsigned char *)s->init_buf->data;
+	if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
+		{
+		d=p+11;
+		*(p++)=SSL2_MT_SERVER_HELLO;		/* type */
+		hit=s->hit;
+		*(p++)=(unsigned char)hit;
+#if 1
+		if (!hit)
+			{
+			if (s->session->sess_cert != NULL)
+				/* This can't really happen because get_client_hello
+				 * has called ssl_get_new_session, which does not set
+				 * sess_cert. */
+				ssl_sess_cert_free(s->session->sess_cert);
+			s->session->sess_cert = ssl_sess_cert_new();
+			if (s->session->sess_cert == NULL)
+				{
+				SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
+				return(-1);
+				}
+			}
+		/* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
+		 * depending on whether it survived in the internal cache
+		 * or was retrieved from an external cache.
+		 * If it is NULL, we cannot put any useful data in it anyway,
+		 * so we don't touch it.
+		 */
+
+#else /* That's what used to be done when cert_st and sess_cert_st were
+	   * the same. */
+		if (!hit)
+			{			/* else add cert to session */
+			CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
+			if (s->session->sess_cert != NULL)
+				ssl_cert_free(s->session->sess_cert);
+			s->session->sess_cert=s->cert;		
+			}
+		else	/* We have a session id-cache hit, if the
+			 * session-id has no certificate listed against
+			 * the 'cert' structure, grab the 'old' one
+			 * listed against the SSL connection */
+			{
+			if (s->session->sess_cert == NULL)
+				{
+				CRYPTO_add(&s->cert->references,1,
+					CRYPTO_LOCK_SSL_CERT);
+				s->session->sess_cert=s->cert;
+				}
+			}
+#endif
+
+		if (s->cert == NULL)
+			{
+			ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
+			SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
+			return(-1);
+			}
+
+		if (hit)
+			{
+			*(p++)=0;		/* no certificate type */
+			s2n(s->version,p);	/* version */
+			s2n(0,p);		/* cert len */
+			s2n(0,p);		/* ciphers len */
+			}
+		else
+			{
+			/* EAY EAY */
+			/* put certificate type */
+			*(p++)=SSL2_CT_X509_CERTIFICATE;
+			s2n(s->version,p);	/* version */
+			n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
+			s2n(n,p);		/* certificate length */
+			i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
+			n=0;
+			
+			/* lets send out the ciphers we like in the
+			 * prefered order */
+			n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
+			d+=n;
+			s2n(n,p);		/* add cipher length */
+			}
+
+		/* make and send conn_id */
+		s2n(SSL2_CONNECTION_ID_LENGTH,p);	/* add conn_id length */
+		s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
+		if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
+			return -1;
+		memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
+		d+=SSL2_CONNECTION_ID_LENGTH;
+
+		s->state=SSL2_ST_SEND_SERVER_HELLO_B;
+		s->init_num=d-(unsigned char *)s->init_buf->data;
+		s->init_off=0;
+		}
+	/* SSL2_ST_SEND_SERVER_HELLO_B */
+ 	/* If we are using TCP/IP, the performance is bad if we do 2
+ 	 * writes without a read between them.  This occurs when
+ 	 * Session-id reuse is used, so I will put in a buffering module
+ 	 */
+ 	if (s->hit)
+ 		{
+		if (!ssl_init_wbio_buffer(s,1)) return(-1);
+ 		}
+ 
+	return(ssl2_do_write(s));
+	}
+
+static int get_client_finished(SSL *s)
+	{
+	unsigned char *p;
+	int i, n;
+	unsigned long len;
+
+	p=(unsigned char *)s->init_buf->data;
+	if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
+		{
+		i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
+		if (i < 1-s->init_num)
+			return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
+		s->init_num += i;
+
+		if (*p != SSL2_MT_CLIENT_FINISHED)
+			{
+			if (*p != SSL2_MT_ERROR)
+				{
+				ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+				SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
+				}
+			else
+				{
+				SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
+				/* try to read the error message */
+				i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
+				return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
+				}
+			return(-1);
+			}
+		s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
+		}
+
+	/* SSL2_ST_GET_CLIENT_FINISHED_B */
+	if (s->s2->conn_id_length > sizeof s->s2->conn_id)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
+		return -1;
+		}
+	len = 1 + (unsigned long)s->s2->conn_id_length;
+	n = (int)len - s->init_num;
+	i = ssl2_read(s,(char *)&(p[s->init_num]),n);
+	if (i < n)
+		{
+		return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
+		}
+	if (s->msg_callback)
+		s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
+	p += 1;
+	if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
+		{
+		ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+		SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
+		return(-1);
+		}
+	return(1);
+	}
+
+static int server_verify(SSL *s)
+	{
+	unsigned char *p;
+
+	if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
+		{
+		p=(unsigned char *)s->init_buf->data;
+		*(p++)=SSL2_MT_SERVER_VERIFY;
+		if (s->s2->challenge_length > sizeof s->s2->challenge)
+			{
+			SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
+			return -1;
+			}
+		memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
+		/* p+=s->s2->challenge_length; */
+
+		s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
+		s->init_num=s->s2->challenge_length+1;
+		s->init_off=0;
+		}
+	return(ssl2_do_write(s));
+	}
+
+static int server_finish(SSL *s)
+	{
+	unsigned char *p;
+
+	if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
+		{
+		p=(unsigned char *)s->init_buf->data;
+		*(p++)=SSL2_MT_SERVER_FINISHED;
+
+		if (s->session->session_id_length > sizeof s->session->session_id)
+			{
+			SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
+			return -1;
+			}
+		memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
+		/* p+=s->session->session_id_length; */
+
+		s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
+		s->init_num=s->session->session_id_length+1;
+		s->init_off=0;
+		}
+
+	/* SSL2_ST_SEND_SERVER_FINISHED_B */
+	return(ssl2_do_write(s));
+	}
+
+/* send the request and check the response */
+static int request_certificate(SSL *s)
+	{
+	const unsigned char *cp;
+	unsigned char *p,*p2,*buf2;
+	unsigned char *ccd;
+	int i,j,ctype,ret= -1;
+	unsigned long len;
+	X509 *x509=NULL;
+	STACK_OF(X509) *sk=NULL;
+
+	ccd=s->s2->tmp.ccl;
+	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
+		{
+		p=(unsigned char *)s->init_buf->data;
+		*(p++)=SSL2_MT_REQUEST_CERTIFICATE;
+		*(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
+		if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
+			return -1;
+		memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
+
+		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
+		s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
+		s->init_off=0;
+		}
+
+	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
+		{
+		i=ssl2_do_write(s);
+		if (i <= 0)
+			{
+			ret=i;
+			goto end;
+			}
+
+		s->init_num=0;
+		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
+		}
+
+	if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
+		{
+		p=(unsigned char *)s->init_buf->data;
+		i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
+		if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
+		                        * (probably NO-CERTIFICATE-ERROR) */
+			{
+			ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
+			goto end;
+			}
+		s->init_num += i;
+
+		if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
+			{
+			n2s(p,i);
+			if (i != SSL2_PE_NO_CERTIFICATE)
+				{
+				/* not the error message we expected -- let ssl2_part_read handle it */
+				s->init_num -= 3;
+				ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
+				goto end;
+				}
+
+			if (s->msg_callback)
+				s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
+
+			/* this is the one place where we can recover from an SSL 2.0 error */
+
+			if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
+				{
+				ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
+				SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
+				goto end;
+				}
+			ret=1;
+			goto end;
+			}
+		if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
+			{
+			ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
+			goto end;
+			}
+		if (s->init_num != 6)
+			{
+			SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+			goto end;
+			}
+		
+		/* ok we have a response */
+		/* certificate type, there is only one right now. */
+		ctype= *(p++);
+		if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
+			{
+			ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
+			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
+			goto end;
+			}
+		n2s(p,i); s->s2->tmp.clen=i;
+		n2s(p,i); s->s2->tmp.rlen=i;
+		s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
+		}
+
+	/* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
+	p=(unsigned char *)s->init_buf->data;
+	len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
+	if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
+		{
+		SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
+		goto end;
+		}
+	j = (int)len - s->init_num;
+	i = ssl2_read(s,(char *)&(p[s->init_num]),j);
+	if (i < j) 
+		{
+		ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
+		goto end;
+		}
+	if (s->msg_callback)
+		s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
+	p += 6;
+
+	cp = p;
+	x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
+	if (x509 == NULL)
+		{
+		SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
+		goto msg_end;
+		}
+
+	if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
+		{
+		SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
+		goto msg_end;
+		}
+
+	i=ssl_verify_cert_chain(s,sk);
+
+	if (i > 0)	/* we like the packet, now check the chksum */
+		{
+		EVP_MD_CTX ctx;
+		EVP_PKEY *pkey=NULL;
+
+		EVP_MD_CTX_init(&ctx);
+		EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
+		EVP_VerifyUpdate(&ctx,s->s2->key_material,
+				 s->s2->key_material_length);
+		EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
+
+		i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
+		buf2=OPENSSL_malloc((unsigned int)i);
+		if (buf2 == NULL)
+			{
+			SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
+			goto msg_end;
+			}
+		p2=buf2;
+		i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
+		EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
+		OPENSSL_free(buf2);
+
+		pkey=X509_get_pubkey(x509);
+		if (pkey == NULL) goto end;
+		i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
+		EVP_PKEY_free(pkey);
+		EVP_MD_CTX_cleanup(&ctx);
+
+		if (i > 0)
+			{
+			if (s->session->peer != NULL)
+				X509_free(s->session->peer);
+			s->session->peer=x509;
+			CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
+			s->session->verify_result = s->verify_result;
+			ret=1;
+			goto end;
+			}
+		else
+			{
+			SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
+			goto msg_end;
+			}
+		}
+	else
+		{
+msg_end:
+		ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
+		}
+end:
+	sk_X509_free(sk);
+	X509_free(x509);
+	return(ret);
+	}
+
+static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
+	     unsigned char *to, int padding)
+	{
+	RSA *rsa;
+	int i;
+
+	if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
+		{
+		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
+		return(-1);
+		}
+	if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
+		{
+		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
+		return(-1);
+		}
+	rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
+
+	/* we have the public key */
+	i=RSA_private_decrypt(len,from,to,rsa,padding);
+	if (i < 0)
+		SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
+	return(i);
+	}
+#else /* !OPENSSL_NO_SSL2 */
+
+# if PEDANTIC
+static void *dummy=&dummy;
+# endif
+
+#endif