Add back PCI_MAP_FIXUP, it was mistakenly removed.

[dfdiff.git] / crypto / openssl-0.9 / ssl / d1_srvr.c

/* ssl/d1_srvr.c */
/* 
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
 */
/* ====================================================================
 * Copyright (c) 1999-2005 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).
 *
 */
/* 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.]
 */

#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/md5.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif

static SSL_METHOD *dtls1_get_server_method(int ver);
static int dtls1_send_hello_verify_request(SSL *s);

static SSL_METHOD *dtls1_get_server_method(int ver)
        {
        if (ver == DTLS1_VERSION)
                return(DTLSv1_server_method());
        else
                return(NULL);
        }

IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
                        dtls1_accept,
                        ssl_undefined_function,
                        dtls1_get_server_method)

int dtls1_accept(SSL *s)
        {
        BUF_MEM *buf;
        unsigned long l,Time=(unsigned long)time(NULL);
        void (*cb)(const SSL *ssl,int type,int val)=NULL;
        long num1;
        int ret= -1;
        int new_state,state,skip=0;

        RAND_add(&Time,sizeof(Time),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_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
                return(-1);
                }

        for (;;)
                {
                state=s->state;

                switch (s->state)
                        {
                case SSL_ST_RENEGOTIATE:
                        s->new_session=1;
                        /* s->state=SSL_ST_ACCEPT; */

                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);

                        if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
                                {
                                SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
                                return -1;
                                }
                        s->type=SSL_ST_ACCEPT;

                        if (s->init_buf == NULL)
                                {
                                if ((buf=BUF_MEM_new()) == NULL)
                                        {
                                        ret= -1;
                                        goto end;
                                        }
                                if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
                                        {
                                        ret= -1;
                                        goto end;
                                        }
                                s->init_buf=buf;
                                }

                        if (!ssl3_setup_buffers(s))
                                {
                                ret= -1;
                                goto end;
                                }

                        s->init_num=0;

                        if (s->state != SSL_ST_RENEGOTIATE)
                                {
                                /* Ok, we now need to push on a buffering BIO so that
                                 * the output is sent in a way that TCP likes :-)
                                 */
                                if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }

                                ssl3_init_finished_mac(s);
                                s->state=SSL3_ST_SR_CLNT_HELLO_A;
                                s->ctx->stats.sess_accept++;
                                }
                        else
                                {
                                /* s->state == SSL_ST_RENEGOTIATE,
                                 * we will just send a HelloRequest */
                                s->ctx->stats.sess_accept_renegotiate++;
                                s->state=SSL3_ST_SW_HELLO_REQ_A;
                                }

            if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
                s->d1->send_cookie = 1;
            else
                s->d1->send_cookie = 0;

                        break;

                case SSL3_ST_SW_HELLO_REQ_A:
                case SSL3_ST_SW_HELLO_REQ_B:

                        s->shutdown=0;
                        ret=dtls1_send_hello_request(s);
                        if (ret <= 0) goto end;
                        s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
                        s->state=SSL3_ST_SW_FLUSH;
                        s->init_num=0;

                        ssl3_init_finished_mac(s);
                        break;

                case SSL3_ST_SW_HELLO_REQ_C:
                        s->state=SSL_ST_OK;
                        break;

                case SSL3_ST_SR_CLNT_HELLO_A:
                case SSL3_ST_SR_CLNT_HELLO_B:
                case SSL3_ST_SR_CLNT_HELLO_C:

                        s->shutdown=0;
                        ret=ssl3_get_client_hello(s);
                        if (ret <= 0) goto end;
                        s->new_session = 2;

                        if ( s->d1->send_cookie)
                                s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
                        else
                                s->state = SSL3_ST_SW_SRVR_HELLO_A;

                        s->init_num=0;
                        break;
                        
                case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
                case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:

                        ret = dtls1_send_hello_verify_request(s);
                        if ( ret <= 0) goto end;
                        s->d1->send_cookie = 0;
                        s->state=SSL3_ST_SW_FLUSH;
                        s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
                        break;
                        
                case SSL3_ST_SW_SRVR_HELLO_A:
                case SSL3_ST_SW_SRVR_HELLO_B:
                        ret=dtls1_send_server_hello(s);
                        if (ret <= 0) goto end;

                        if (s->hit)
                                s->state=SSL3_ST_SW_CHANGE_A;
                        else
                                s->state=SSL3_ST_SW_CERT_A;
                        s->init_num=0;
                        break;

                case SSL3_ST_SW_CERT_A:
                case SSL3_ST_SW_CERT_B:
                        /* Check if it is anon DH */
                        if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
                                {
                                ret=dtls1_send_server_certificate(s);
                                if (ret <= 0) goto end;
                                }
                        else
                                skip=1;
                        s->state=SSL3_ST_SW_KEY_EXCH_A;
                        s->init_num=0;
                        break;

                case SSL3_ST_SW_KEY_EXCH_A:
                case SSL3_ST_SW_KEY_EXCH_B:
                        l=s->s3->tmp.new_cipher->algorithms;

                        /* clear this, it may get reset by
                         * send_server_key_exchange */
                        if ((s->options & SSL_OP_EPHEMERAL_RSA)
#ifndef OPENSSL_NO_KRB5
                                && !(l & SSL_KRB5)
#endif /* OPENSSL_NO_KRB5 */
                                )
                                /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
                                 * even when forbidden by protocol specs
                                 * (handshake may fail as clients are not required to
                                 * be able to handle this) */
                                s->s3->tmp.use_rsa_tmp=1;
                        else
                                s->s3->tmp.use_rsa_tmp=0;

                        /* only send if a DH key exchange, fortezza or
                         * RSA but we have a sign only certificate */
                        if (s->s3->tmp.use_rsa_tmp
                            || (l & (SSL_DH|SSL_kFZA))
                            || ((l & SSL_kRSA)
                                && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
                                    || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
                                        && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
                                        )
                                    )
                                )
                            )
                                {
                                ret=dtls1_send_server_key_exchange(s);
                                if (ret <= 0) goto end;
                                }
                        else
                                skip=1;

                        s->state=SSL3_ST_SW_CERT_REQ_A;
                        s->init_num=0;
                        break;

                case SSL3_ST_SW_CERT_REQ_A:
                case SSL3_ST_SW_CERT_REQ_B:
                        if (/* don't request cert unless asked for it: */
                                !(s->verify_mode & SSL_VERIFY_PEER) ||
                                /* if SSL_VERIFY_CLIENT_ONCE is set,
                                 * don't request cert during re-negotiation: */
                                ((s->session->peer != NULL) &&
                                 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
                                /* never request cert in anonymous ciphersuites
                                 * (see section "Certificate request" in SSL 3 drafts
                                 * and in RFC 2246): */
                                ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
                                 /* ... except when the application insists on verification
                                  * (against the specs, but s3_clnt.c accepts this for SSL 3) */
                                 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
                                 /* never request cert in Kerberos ciphersuites */
                                (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
                                {
                                /* no cert request */
                                skip=1;
                                s->s3->tmp.cert_request=0;
                                s->state=SSL3_ST_SW_SRVR_DONE_A;
                                }
                        else
                                {
                                s->s3->tmp.cert_request=1;
                                ret=dtls1_send_certificate_request(s);
                                if (ret <= 0) goto end;
#ifndef NETSCAPE_HANG_BUG
                                s->state=SSL3_ST_SW_SRVR_DONE_A;
#else
                                s->state=SSL3_ST_SW_FLUSH;
                                s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
#endif
                                s->init_num=0;
                                }
                        break;

                case SSL3_ST_SW_SRVR_DONE_A:
                case SSL3_ST_SW_SRVR_DONE_B:
                        ret=dtls1_send_server_done(s);
                        if (ret <= 0) goto end;
                        s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
                        s->state=SSL3_ST_SW_FLUSH;
                        s->init_num=0;
                        break;
                
                case SSL3_ST_SW_FLUSH:
                        /* number of bytes to be flushed */
                        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;
                                }

                        s->state=s->s3->tmp.next_state;
                        break;

                case SSL3_ST_SR_CERT_A:
                case SSL3_ST_SR_CERT_B:
                        /* Check for second client hello (MS SGC) */
                        ret = ssl3_check_client_hello(s);
                        if (ret <= 0)
                                goto end;
                        if (ret == 2)
                                s->state = SSL3_ST_SR_CLNT_HELLO_C;
                        else {
                                /* could be sent for a DH cert, even if we
                                 * have not asked for it :-) */
                                ret=ssl3_get_client_certificate(s);
                                if (ret <= 0) goto end;
                                s->init_num=0;
                                s->state=SSL3_ST_SR_KEY_EXCH_A;
                        }
                        break;

                case SSL3_ST_SR_KEY_EXCH_A:
                case SSL3_ST_SR_KEY_EXCH_B:
                        ret=ssl3_get_client_key_exchange(s);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_SR_CERT_VRFY_A;
                        s->init_num=0;

                        /* We need to get hashes here so if there is
                         * a client cert, it can be verified */ 
                        s->method->ssl3_enc->cert_verify_mac(s,
                                &(s->s3->finish_dgst1),
                                &(s->s3->tmp.cert_verify_md[0]));
                        s->method->ssl3_enc->cert_verify_mac(s,
                                &(s->s3->finish_dgst2),
                                &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));

                        break;

                case SSL3_ST_SR_CERT_VRFY_A:
                case SSL3_ST_SR_CERT_VRFY_B:

                        /* we should decide if we expected this one */
                        ret=ssl3_get_cert_verify(s);
                        if (ret <= 0) goto end;

                        s->state=SSL3_ST_SR_FINISHED_A;
                        s->init_num=0;
                        break;

                case SSL3_ST_SR_FINISHED_A:
                case SSL3_ST_SR_FINISHED_B:
                        ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
                                SSL3_ST_SR_FINISHED_B);
                        if (ret <= 0) goto end;
                        if (s->hit)
                                s->state=SSL_ST_OK;
                        else
                                s->state=SSL3_ST_SW_CHANGE_A;
                        s->init_num=0;
                        break;

                case SSL3_ST_SW_CHANGE_A:
                case SSL3_ST_SW_CHANGE_B:

                        s->session->cipher=s->s3->tmp.new_cipher;
                        if (!s->method->ssl3_enc->setup_key_block(s))
                                { ret= -1; goto end; }

                        ret=dtls1_send_change_cipher_spec(s,
                                SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);

                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_SW_FINISHED_A;
                        s->init_num=0;

                        if (!s->method->ssl3_enc->change_cipher_state(s,
                                SSL3_CHANGE_CIPHER_SERVER_WRITE))
                                {
                                ret= -1;
                                goto end;
                                }

                        dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
                        break;

                case SSL3_ST_SW_FINISHED_A:
                case SSL3_ST_SW_FINISHED_B:
                        ret=dtls1_send_finished(s,
                                SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
                                s->method->ssl3_enc->server_finished_label,
                                s->method->ssl3_enc->server_finished_label_len);
                        if (ret <= 0) goto end;
                        s->state=SSL3_ST_SW_FLUSH;
                        if (s->hit)
                                s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
                        else
                                s->s3->tmp.next_state=SSL_ST_OK;
                        s->init_num=0;
                        break;

                case SSL_ST_OK:
                        /* clean a few things up */
                        ssl3_cleanup_key_block(s);

#if 0
                        BUF_MEM_free(s->init_buf);
                        s->init_buf=NULL;
#endif

                        /* remove buffering on output */
                        ssl_free_wbio_buffer(s);

                        s->init_num=0;

                        if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
                                {
                                /* actually not necessarily a 'new' session unless
                                 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
                                
                                s->new_session=0;
                                
                                ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
                                
                                s->ctx->stats.sess_accept_good++;
                                /* s->server=1; */
                                s->handshake_func=dtls1_accept;

                                if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
                                }
                        
                        ret = 1;

                        /* done handshaking, next message is client hello */
                        s->d1->handshake_read_seq = 0;
                        /* next message is server hello */
                        s->d1->handshake_write_seq = 0;
                        goto end;
                        /* break; */

                default:
                        SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
                        ret= -1;
                        goto end;
                        /* break; */
                        }
                
                if (!s->s3->tmp.reuse_message && !skip)
                        {
                        if (s->debug)
                                {
                                if ((ret=BIO_flush(s->wbio)) <= 0)
                                        goto end;
                                }


                        if ((cb != NULL) && (s->state != state))
                                {
                                new_state=s->state;
                                s->state=state;
                                cb(s,SSL_CB_ACCEPT_LOOP,1);
                                s->state=new_state;
                                }
                        }
                skip=0;
                }
end:
        /* BIO_flush(s->wbio); */

        s->in_handshake--;
        if (cb != NULL)
                cb(s,SSL_CB_ACCEPT_EXIT,ret);
        return(ret);
        }

int dtls1_send_hello_request(SSL *s)
        {
        unsigned char *p;

        if (s->state == SSL3_ST_SW_HELLO_REQ_A)
                {
                p=(unsigned char *)s->init_buf->data;
                p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);

                s->state=SSL3_ST_SW_HELLO_REQ_B;
                /* number of bytes to write */
                s->init_num=DTLS1_HM_HEADER_LENGTH;
                s->init_off=0;

                /* no need to buffer this message, since there are no retransmit 
                 * requests for it */
                }

        /* SSL3_ST_SW_HELLO_REQ_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
        }

int dtls1_send_hello_verify_request(SSL *s)
        {
        unsigned int msg_len;
        unsigned char *msg, *buf, *p;

        if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
                {
                buf = (unsigned char *)s->init_buf->data;

                msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
                *(p++) = s->version >> 8;
                *(p++) = s->version & 0xFF;

                *(p++) = (unsigned char) s->d1->cookie_len;
        if ( s->ctx->app_gen_cookie_cb != NULL &&
            s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 
                &(s->d1->cookie_len)) == 0)
            {
                        SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
            return 0;
            }
        /* else the cookie is assumed to have 
         * been initialized by the application */

                memcpy(p, s->d1->cookie, s->d1->cookie_len);
                p += s->d1->cookie_len;
                msg_len = p - msg;

                dtls1_set_message_header(s, buf,
                        DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);

                s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
                /* number of bytes to write */
                s->init_num=p-buf;
                s->init_off=0;

                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);
                }

        /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
        }

int dtls1_send_server_hello(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
        int i;
        unsigned int sl;
        unsigned long l,Time;

        if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
                {
                buf=(unsigned char *)s->init_buf->data;
                p=s->s3->server_random;
                Time=(unsigned long)time(NULL);                 /* Time */
                l2n(Time,p);
                RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
                /* Do the message type and length last */
                d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);

                *(p++)=s->version>>8;
                *(p++)=s->version&0xff;

                /* Random stuff */
                memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
                p+=SSL3_RANDOM_SIZE;

                /* now in theory we have 3 options to sending back the
                 * session id.  If it is a re-use, we send back the
                 * old session-id, if it is a new session, we send
                 * back the new session-id or we send back a 0 length
                 * session-id if we want it to be single use.
                 * Currently I will not implement the '0' length session-id
                 * 12-Jan-98 - I'll now support the '0' length stuff.
                 */
                if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
                        s->session->session_id_length=0;

                sl=s->session->session_id_length;
                if (sl > sizeof s->session->session_id)
                        {
                        SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
                        return -1;
                        }
                *(p++)=sl;
                memcpy(p,s->session->session_id,sl);
                p+=sl;

                /* put the cipher */
                i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
                p+=i;

                /* put the compression method */
#ifdef OPENSSL_NO_COMP
                *(p++)=0;
#else
                if (s->s3->tmp.new_compression == NULL)
                        *(p++)=0;
                else
                        *(p++)=s->s3->tmp.new_compression->id;
#endif

                /* do the header */
                l=(p-d);
                d=buf;

                d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);

                s->state=SSL3_ST_CW_CLNT_HELLO_B;
                /* number of bytes to write */
                s->init_num=p-buf;
                s->init_off=0;

                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);
                }

        /* SSL3_ST_CW_CLNT_HELLO_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
        }

int dtls1_send_server_done(SSL *s)
        {
        unsigned char *p;

        if (s->state == SSL3_ST_SW_SRVR_DONE_A)
                {
                p=(unsigned char *)s->init_buf->data;

                /* do the header */
                p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);

                s->state=SSL3_ST_SW_SRVR_DONE_B;
                /* number of bytes to write */
                s->init_num=DTLS1_HM_HEADER_LENGTH;
                s->init_off=0;

                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);
                }

        /* SSL3_ST_CW_CLNT_HELLO_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
        }

int dtls1_send_server_key_exchange(SSL *s)
        {
#ifndef OPENSSL_NO_RSA
        unsigned char *q;
        int j,num;
        RSA *rsa;
        unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
        unsigned int u;
#endif
#ifndef OPENSSL_NO_DH
        DH *dh=NULL,*dhp;
#endif
        EVP_PKEY *pkey;
        unsigned char *p,*d;
        int al,i;
        unsigned long type;
        int n;
        CERT *cert;
        BIGNUM *r[4];
        int nr[4],kn;
        BUF_MEM *buf;
        EVP_MD_CTX md_ctx;

        EVP_MD_CTX_init(&md_ctx);
        if (s->state == SSL3_ST_SW_KEY_EXCH_A)
                {
                type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
                cert=s->cert;

                buf=s->init_buf;

                r[0]=r[1]=r[2]=r[3]=NULL;
                n=0;
#ifndef OPENSSL_NO_RSA
                if (type & SSL_kRSA)
                        {
                        rsa=cert->rsa_tmp;
                        if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
                                {
                                rsa=s->cert->rsa_tmp_cb(s,
                                      SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
                                      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
                                if(rsa == NULL)
                                {
                                        al=SSL_AD_HANDSHAKE_FAILURE;
                                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
                                        goto f_err;
                                }
                                RSA_up_ref(rsa);
                                cert->rsa_tmp=rsa;
                                }
                        if (rsa == NULL)
                                {
                                al=SSL_AD_HANDSHAKE_FAILURE;
                                SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
                                goto f_err;
                                }
                        r[0]=rsa->n;
                        r[1]=rsa->e;
                        s->s3->tmp.use_rsa_tmp=1;
                        }
                else
#endif
#ifndef OPENSSL_NO_DH
                        if (type & SSL_kEDH)
                        {
                        dhp=cert->dh_tmp;
                        if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
                                dhp=s->cert->dh_tmp_cb(s,
                                      SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
                                      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
                        if (dhp == NULL)
                                {
                                al=SSL_AD_HANDSHAKE_FAILURE;
                                SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
                                goto f_err;
                                }

                        if (s->s3->tmp.dh != NULL)
                                {
                                DH_free(dh);
                                SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
                                goto err;
                                }

                        if ((dh=DHparams_dup(dhp)) == NULL)
                                {
                                SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
                                goto err;
                                }

                        s->s3->tmp.dh=dh;
                        if ((dhp->pub_key == NULL ||
                             dhp->priv_key == NULL ||
                             (s->options & SSL_OP_SINGLE_DH_USE)))
                                {
                                if(!DH_generate_key(dh))
                                    {
                                    SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
                                           ERR_R_DH_LIB);
                                    goto err;
                                    }
                                }
                        else
                                {
                                dh->pub_key=BN_dup(dhp->pub_key);
                                dh->priv_key=BN_dup(dhp->priv_key);
                                if ((dh->pub_key == NULL) ||
                                        (dh->priv_key == NULL))
                                        {
                                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
                                        goto err;
                                        }
                                }
                        r[0]=dh->p;
                        r[1]=dh->g;
                        r[2]=dh->pub_key;
                        }
                else 
#endif
                        {
                        al=SSL_AD_HANDSHAKE_FAILURE;
                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
                        goto f_err;
                        }
                for (i=0; r[i] != NULL; i++)
                        {
                        nr[i]=BN_num_bytes(r[i]);
                        n+=2+nr[i];
                        }

                if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
                        {
                        if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
                                == NULL)
                                {
                                al=SSL_AD_DECODE_ERROR;
                                goto f_err;
                                }
                        kn=EVP_PKEY_size(pkey);
                        }
                else
                        {
                        pkey=NULL;
                        kn=0;
                        }

                if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
                        {
                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
                        goto err;
                        }
                d=(unsigned char *)s->init_buf->data;
                p= &(d[DTLS1_HM_HEADER_LENGTH]);

                for (i=0; r[i] != NULL; i++)
                        {
                        s2n(nr[i],p);
                        BN_bn2bin(r[i],p);
                        p+=nr[i];
                        }

                /* not anonymous */
                if (pkey != NULL)
                        {
                        /* n is the length of the params, they start at
                         * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
                         * at the end. */
#ifndef OPENSSL_NO_RSA
                        if (pkey->type == EVP_PKEY_RSA)
                                {
                                q=md_buf;
                                j=0;
                                for (num=2; num > 0; num--)
                                        {
                                        EVP_DigestInit_ex(&md_ctx,(num == 2)
                                                ?s->ctx->md5:s->ctx->sha1, NULL);
                                        EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
                                        EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
                                        EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
                                        EVP_DigestFinal_ex(&md_ctx,q,
                                                (unsigned int *)&i);
                                        q+=i;
                                        j+=i;
                                        }
                                if (RSA_sign(NID_md5_sha1, md_buf, j,
                                        &(p[2]), &u, pkey->pkey.rsa) <= 0)
                                        {
                                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
                                        goto err;
                                        }
                                s2n(u,p);
                                n+=u+2;
                                }
                        else
#endif
#if !defined(OPENSSL_NO_DSA)
                                if (pkey->type == EVP_PKEY_DSA)
                                {
                                /* lets do DSS */
                                EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
                                EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
                                EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
                                EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
                                if (!EVP_SignFinal(&md_ctx,&(p[2]),
                                        (unsigned int *)&i,pkey))
                                        {
                                        SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
                                        goto err;
                                        }
                                s2n(i,p);
                                n+=i+2;
                                }
                        else
#endif
                                {
                                /* Is this error check actually needed? */
                                al=SSL_AD_HANDSHAKE_FAILURE;
                                SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
                                goto f_err;
                                }
                        }

                d = dtls1_set_message_header(s, d,
                        SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);

                /* we should now have things packed up, so lets send
                 * it off */
                s->init_num=n+DTLS1_HM_HEADER_LENGTH;
                s->init_off=0;

                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);
                }

        s->state = SSL3_ST_SW_KEY_EXCH_B;
        EVP_MD_CTX_cleanup(&md_ctx);
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        EVP_MD_CTX_cleanup(&md_ctx);
        return(-1);
        }

int dtls1_send_certificate_request(SSL *s)
        {
        unsigned char *p,*d;
        int i,j,nl,off,n;
        STACK_OF(X509_NAME) *sk=NULL;
        X509_NAME *name;
        BUF_MEM *buf;

        if (s->state == SSL3_ST_SW_CERT_REQ_A)
                {
                buf=s->init_buf;

                d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);

                /* get the list of acceptable cert types */
                p++;
                n=ssl3_get_req_cert_type(s,p);
                d[0]=n;
                p+=n;
                n++;

                off=n;
                p+=2;
                n+=2;

                sk=SSL_get_client_CA_list(s);
                nl=0;
                if (sk != NULL)
                        {
                        for (i=0; i<sk_X509_NAME_num(sk); i++)
                                {
                                name=sk_X509_NAME_value(sk,i);
                                j=i2d_X509_NAME(name,NULL);
                                if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
                                        {
                                        SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
                                        goto err;
                                        }
                                p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
                                if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
                                        {
                                        s2n(j,p);
                                        i2d_X509_NAME(name,&p);
                                        n+=2+j;
                                        nl+=2+j;
                                        }
                                else
                                        {
                                        d=p;
                                        i2d_X509_NAME(name,&p);
                                        j-=2; s2n(j,d); j+=2;
                                        n+=j;
                                        nl+=j;
                                        }
                                }
                        }
                /* else no CA names */
                p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
                s2n(nl,p);

                d=(unsigned char *)buf->data;
                *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
                l2n3(n,d);
                s2n(s->d1->handshake_write_seq,d);
                s->d1->handshake_write_seq++;

                /* we should now have things packed up, so lets send
                 * it off */

                s->init_num=n+DTLS1_HM_HEADER_LENGTH;
                s->init_off=0;
#ifdef NETSCAPE_HANG_BUG
/* XXX: what to do about this? */
                p=(unsigned char *)s->init_buf->data + s->init_num;

                /* do the header */
                *(p++)=SSL3_MT_SERVER_DONE;
                *(p++)=0;
                *(p++)=0;
                *(p++)=0;
                s->init_num += 4;
#endif

                /* XDTLS:  set message header ? */
                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);

                s->state = SSL3_ST_SW_CERT_REQ_B;
                }

        /* SSL3_ST_SW_CERT_REQ_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
err:
        return(-1);
        }

int dtls1_send_server_certificate(SSL *s)
        {
        unsigned long l;
        X509 *x;

        if (s->state == SSL3_ST_SW_CERT_A)
                {
                x=ssl_get_server_send_cert(s);
                if (x == NULL &&
                        /* VRS: allow null cert if auth == KRB5 */
                        (s->s3->tmp.new_cipher->algorithms
                                & (SSL_MKEY_MASK|SSL_AUTH_MASK))
                        != (SSL_aKRB5|SSL_kKRB5))
                        {
                        SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
                        return(0);
                        }

                l=dtls1_output_cert_chain(s,x);
                s->state=SSL3_ST_SW_CERT_B;
                s->init_num=(int)l;
                s->init_off=0;

                /* buffer the message to handle re-xmits */
                dtls1_buffer_message(s, 0);
                }

        /* SSL3_ST_SW_CERT_B */
        return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
        }