initial commit

1 files changed, 870 insertions, 0 deletions

diff --git a/openssl/ssl/d1_clnt.c b/openssl/ssl/d1_clnt.c
new file mode 100644
index 0000000..7e2f5c2
--- /dev/null
+++ b/openssl/ssl/d1_clnt.c
@@ -0,0 +1,870 @@
+/* ssl/d1_clnt.c */
+/*
+ * DTLS implementation written by Nagendra Modadugu
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2007 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"
+#ifndef OPENSSL_NO_KRB5
+# include "kssl_lcl.h"
+#endif
+#include <openssl/buffer.h>
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#include <openssl/md5.h>
+#include <openssl/bn.h>
+#ifndef OPENSSL_NO_DH
+# include <openssl/dh.h>
+#endif
+
+static const SSL_METHOD *dtls1_get_client_method(int ver);
+static int dtls1_get_hello_verify(SSL *s);
+
+static const SSL_METHOD *dtls1_get_client_method(int ver)
+{
+    if (ver == DTLS_ANY_VERSION)
+        return DTLS_client_method();
+    else if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
+        return DTLSv1_client_method();
+    else if (ver == DTLS1_2_VERSION)
+        return DTLSv1_2_client_method();
+    else
+        return NULL;
+}
+
+IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
+                          DTLSv1_client_method,
+                          ssl_undefined_function,
+                          dtls1_connect,
+                          dtls1_get_client_method, DTLSv1_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
+                          DTLSv1_2_client_method,
+                          ssl_undefined_function,
+                          dtls1_connect,
+                          dtls1_get_client_method, DTLSv1_2_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
+                          DTLS_client_method,
+                          ssl_undefined_function,
+                          dtls1_connect,
+                          dtls1_get_client_method, DTLSv1_2_enc_data)
+
+int dtls1_connect(SSL *s)
+{
+    BUF_MEM *buf = NULL;
+    unsigned long Time = (unsigned long)time(NULL);
+    void (*cb) (const SSL *ssl, int type, int val) = NULL;
+    int ret = -1;
+    int new_state, state, skip = 0;
+#ifndef OPENSSL_NO_SCTP
+    unsigned char sctpauthkey[64];
+    char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
+#endif
+
+    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;
+
+    s->in_handshake++;
+    if (!SSL_in_init(s) || SSL_in_before(s))
+        SSL_clear(s);
+
+#ifndef OPENSSL_NO_SCTP
+    /*
+     * Notify SCTP BIO socket to enter handshake mode and prevent stream
+     * identifier other than 0. Will be ignored if no SCTP is used.
+     */
+    BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
+             s->in_handshake, NULL);
+#endif
+
+#ifndef OPENSSL_NO_HEARTBEATS
+    /*
+     * If we're awaiting a HeartbeatResponse, pretend we already got and
+     * don't await it anymore, because Heartbeats don't make sense during
+     * handshakes anyway.
+     */
+    if (s->tlsext_hb_pending) {
+        dtls1_stop_timer(s);
+        s->tlsext_hb_pending = 0;
+        s->tlsext_hb_seq++;
+    }
+#endif
+
+    for (;;) {
+        state = s->state;
+
+        switch (s->state) {
+        case SSL_ST_RENEGOTIATE:
+            s->renegotiate = 1;
+            s->state = SSL_ST_CONNECT;
+            s->ctx->stats.sess_connect_renegotiate++;
+            /* break */
+        case SSL_ST_BEFORE:
+        case SSL_ST_CONNECT:
+        case SSL_ST_BEFORE | SSL_ST_CONNECT:
+        case SSL_ST_OK | SSL_ST_CONNECT:
+
+            s->server = 0;
+            if (cb != NULL)
+                cb(s, SSL_CB_HANDSHAKE_START, 1);
+
+            if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
+                (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
+                SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            /* s->version=SSL3_VERSION; */
+            s->type = SSL_ST_CONNECT;
+
+            if (s->init_buf == NULL) {
+                if ((buf = BUF_MEM_new()) == NULL) {
+                    ret = -1;
+                    s->state = SSL_ST_ERR;
+                    goto end;
+                }
+                if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
+                    ret = -1;
+                    s->state = SSL_ST_ERR;
+                    goto end;
+                }
+                s->init_buf = buf;
+                buf = NULL;
+            }
+
+            if (!ssl3_setup_buffers(s)) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            /* setup buffing BIO */
+            if (!ssl_init_wbio_buffer(s, 0)) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            /* don't push the buffering BIO quite yet */
+
+            s->state = SSL3_ST_CW_CLNT_HELLO_A;
+            s->ctx->stats.sess_connect++;
+            s->init_num = 0;
+            /* mark client_random uninitialized */
+            memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
+            s->d1->send_cookie = 0;
+            s->hit = 0;
+            s->d1->change_cipher_spec_ok = 0;
+            /*
+             * Should have been reset by ssl3_get_finished, too.
+             */
+            s->s3->change_cipher_spec = 0;
+            break;
+
+#ifndef OPENSSL_NO_SCTP
+        case DTLS1_SCTP_ST_CR_READ_SOCK:
+
+            if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
+                s->s3->in_read_app_data = 2;
+                s->rwstate = SSL_READING;
+                BIO_clear_retry_flags(SSL_get_rbio(s));
+                BIO_set_retry_read(SSL_get_rbio(s));
+                ret = -1;
+                goto end;
+            }
+
+            s->state = s->s3->tmp.next_state;
+            break;
+
+        case DTLS1_SCTP_ST_CW_WRITE_SOCK:
+            /* read app data until dry event */
+
+            ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
+            if (ret < 0)
+                goto end;
+
+            if (ret == 0) {
+                s->s3->in_read_app_data = 2;
+                s->rwstate = SSL_READING;
+                BIO_clear_retry_flags(SSL_get_rbio(s));
+                BIO_set_retry_read(SSL_get_rbio(s));
+                ret = -1;
+                goto end;
+            }
+
+            s->state = s->d1->next_state;
+            break;
+#endif
+
+        case SSL3_ST_CW_CLNT_HELLO_A:
+            s->shutdown = 0;
+
+            /* every DTLS ClientHello resets Finished MAC */
+            ssl3_init_finished_mac(s);
+
+        case SSL3_ST_CW_CLNT_HELLO_B:
+            dtls1_start_timer(s);
+            ret = ssl3_client_hello(s);
+            if (ret <= 0)
+                goto end;
+
+            if (s->d1->send_cookie) {
+                s->state = SSL3_ST_CW_FLUSH;
+                s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
+            } else
+                s->state = SSL3_ST_CR_SRVR_HELLO_A;
+
+            s->init_num = 0;
+
+#ifndef OPENSSL_NO_SCTP
+            /* Disable buffering for SCTP */
+            if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+#endif
+                /*
+                 * turn on buffering for the next lot of output
+                 */
+                if (s->bbio != s->wbio)
+                    s->wbio = BIO_push(s->bbio, s->wbio);
+#ifndef OPENSSL_NO_SCTP
+            }
+#endif
+
+            break;
+
+        case SSL3_ST_CR_SRVR_HELLO_A:
+        case SSL3_ST_CR_SRVR_HELLO_B:
+            ret = ssl3_get_server_hello(s);
+            if (ret <= 0)
+                goto end;
+            else {
+                if (s->hit) {
+#ifndef OPENSSL_NO_SCTP
+                    /*
+                     * Add new shared key for SCTP-Auth, will be ignored if
+                     * no SCTP used.
+                     */
+                    snprintf((char *)labelbuffer,
+                             sizeof(DTLS1_SCTP_AUTH_LABEL),
+                             DTLS1_SCTP_AUTH_LABEL);
+
+                    if (SSL_export_keying_material(s, sctpauthkey,
+                                               sizeof(sctpauthkey),
+                                               labelbuffer,
+                                               sizeof(labelbuffer), NULL, 0,
+                                               0) <= 0) {
+                        ret = -1;
+                        s->state = SSL_ST_ERR;
+                        goto end;
+                    }
+
+                    BIO_ctrl(SSL_get_wbio(s),
+                             BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
+                             sizeof(sctpauthkey), sctpauthkey);
+#endif
+
+                    s->state = SSL3_ST_CR_FINISHED_A;
+                    if (s->tlsext_ticket_expected) {
+                        /* receive renewed session ticket */
+                        s->state = SSL3_ST_CR_SESSION_TICKET_A;
+                    }
+                } else
+                    s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
+            }
+            s->init_num = 0;
+            break;
+
+        case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
+        case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
+
+            ret = dtls1_get_hello_verify(s);
+            if (ret <= 0)
+                goto end;
+            dtls1_stop_timer(s);
+            if (s->d1->send_cookie) /* start again, with a cookie */
+                s->state = SSL3_ST_CW_CLNT_HELLO_A;
+            else
+                s->state = SSL3_ST_CR_CERT_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CR_CERT_A:
+        case SSL3_ST_CR_CERT_B:
+            /* Check if it is anon DH or PSK */
+            if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
+                !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
+                ret = ssl3_get_server_certificate(s);
+                if (ret <= 0)
+                    goto end;
+#ifndef OPENSSL_NO_TLSEXT
+                if (s->tlsext_status_expected)
+                    s->state = SSL3_ST_CR_CERT_STATUS_A;
+                else
+                    s->state = SSL3_ST_CR_KEY_EXCH_A;
+            } else {
+                skip = 1;
+                s->state = SSL3_ST_CR_KEY_EXCH_A;
+            }
+#else
+            } else
+                skip = 1;
+
+            s->state = SSL3_ST_CR_KEY_EXCH_A;
+#endif
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CR_KEY_EXCH_A:
+        case SSL3_ST_CR_KEY_EXCH_B:
+            ret = ssl3_get_key_exchange(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CR_CERT_REQ_A;
+            s->init_num = 0;
+
+            /*
+             * at this point we check that we have the required stuff from
+             * the server
+             */
+            if (!ssl3_check_cert_and_algorithm(s)) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+            break;
+
+        case SSL3_ST_CR_CERT_REQ_A:
+        case SSL3_ST_CR_CERT_REQ_B:
+            ret = ssl3_get_certificate_request(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CR_SRVR_DONE_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CR_SRVR_DONE_A:
+        case SSL3_ST_CR_SRVR_DONE_B:
+            ret = ssl3_get_server_done(s);
+            if (ret <= 0)
+                goto end;
+            dtls1_stop_timer(s);
+            if (s->s3->tmp.cert_req)
+                s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
+            else
+                s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
+            s->init_num = 0;
+
+#ifndef OPENSSL_NO_SCTP
+            if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
+                state == SSL_ST_RENEGOTIATE)
+                s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
+            else
+#endif
+                s->state = s->s3->tmp.next_state;
+            break;
+
+        case SSL3_ST_CW_CERT_A:
+        case SSL3_ST_CW_CERT_B:
+        case SSL3_ST_CW_CERT_C:
+        case SSL3_ST_CW_CERT_D:
+            dtls1_start_timer(s);
+            ret = ssl3_send_client_certificate(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CW_KEY_EXCH_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CW_KEY_EXCH_A:
+        case SSL3_ST_CW_KEY_EXCH_B:
+            dtls1_start_timer(s);
+            ret = ssl3_send_client_key_exchange(s);
+            if (ret <= 0)
+                goto end;
+
+#ifndef OPENSSL_NO_SCTP
+            /*
+             * Add new shared key for SCTP-Auth, will be ignored if no SCTP
+             * used.
+             */
+            snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
+                     DTLS1_SCTP_AUTH_LABEL);
+
+            if (SSL_export_keying_material(s, sctpauthkey,
+                                       sizeof(sctpauthkey), labelbuffer,
+                                       sizeof(labelbuffer), NULL, 0, 0) <= 0) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
+                     sizeof(sctpauthkey), sctpauthkey);
+#endif
+
+            /*
+             * EAY EAY EAY need to check for DH fix cert sent back
+             */
+            /*
+             * For TLS, cert_req is set to 2, so a cert chain of nothing is
+             * sent, but no verify packet is sent
+             */
+            if (s->s3->tmp.cert_req == 1) {
+                s->state = SSL3_ST_CW_CERT_VRFY_A;
+            } else {
+#ifndef OPENSSL_NO_SCTP
+                if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                    s->d1->next_state = SSL3_ST_CW_CHANGE_A;
+                    s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
+                } else
+#endif
+                    s->state = SSL3_ST_CW_CHANGE_A;
+            }
+
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CW_CERT_VRFY_A:
+        case SSL3_ST_CW_CERT_VRFY_B:
+            dtls1_start_timer(s);
+            ret = ssl3_send_client_verify(s);
+            if (ret <= 0)
+                goto end;
+#ifndef OPENSSL_NO_SCTP
+            if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                s->d1->next_state = SSL3_ST_CW_CHANGE_A;
+                s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
+            } else
+#endif
+                s->state = SSL3_ST_CW_CHANGE_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CW_CHANGE_A:
+        case SSL3_ST_CW_CHANGE_B:
+            if (!s->hit)
+                dtls1_start_timer(s);
+            ret = dtls1_send_change_cipher_spec(s,
+                                                SSL3_ST_CW_CHANGE_A,
+                                                SSL3_ST_CW_CHANGE_B);
+            if (ret <= 0)
+                goto end;
+
+            s->state = SSL3_ST_CW_FINISHED_A;
+            s->init_num = 0;
+
+            s->session->cipher = s->s3->tmp.new_cipher;
+#ifdef OPENSSL_NO_COMP
+            s->session->compress_meth = 0;
+#else
+            if (s->s3->tmp.new_compression == NULL)
+                s->session->compress_meth = 0;
+            else
+                s->session->compress_meth = s->s3->tmp.new_compression->id;
+#endif
+            if (!s->method->ssl3_enc->setup_key_block(s)) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            if (!s->method->ssl3_enc->change_cipher_state(s,
+                                                          SSL3_CHANGE_CIPHER_CLIENT_WRITE))
+            {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+#ifndef OPENSSL_NO_SCTP
+            if (s->hit) {
+                /*
+                 * Change to new shared key of SCTP-Auth, will be ignored if
+                 * no SCTP used.
+                 */
+                BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
+                         0, NULL);
+            }
+#endif
+
+            dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
+            break;
+
+        case SSL3_ST_CW_FINISHED_A:
+        case SSL3_ST_CW_FINISHED_B:
+            if (!s->hit)
+                dtls1_start_timer(s);
+            ret = ssl3_send_finished(s,
+                                     SSL3_ST_CW_FINISHED_A,
+                                     SSL3_ST_CW_FINISHED_B,
+                                     s->method->
+                                     ssl3_enc->client_finished_label,
+                                     s->method->
+                                     ssl3_enc->client_finished_label_len);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CW_FLUSH;
+
+            /* clear flags */
+            s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
+            if (s->hit) {
+                s->s3->tmp.next_state = SSL_ST_OK;
+#ifndef OPENSSL_NO_SCTP
+                if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                    s->d1->next_state = s->s3->tmp.next_state;
+                    s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
+                }
+#endif
+                if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
+                    s->state = SSL_ST_OK;
+#ifndef OPENSSL_NO_SCTP
+                    if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                        s->d1->next_state = SSL_ST_OK;
+                        s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
+                    }
+#endif
+                    s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
+                    s->s3->delay_buf_pop_ret = 0;
+                }
+            } else {
+#ifndef OPENSSL_NO_SCTP
+                /*
+                 * Change to new shared key of SCTP-Auth, will be ignored if
+                 * no SCTP used.
+                 */
+                BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
+                         0, NULL);
+#endif
+
+#ifndef OPENSSL_NO_TLSEXT
+                /*
+                 * Allow NewSessionTicket if ticket expected
+                 */
+                if (s->tlsext_ticket_expected)
+                    s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
+                else
+#endif
+
+                    s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
+            }
+            s->init_num = 0;
+            break;
+
+#ifndef OPENSSL_NO_TLSEXT
+        case SSL3_ST_CR_SESSION_TICKET_A:
+        case SSL3_ST_CR_SESSION_TICKET_B:
+            ret = ssl3_get_new_session_ticket(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CR_FINISHED_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CR_CERT_STATUS_A:
+        case SSL3_ST_CR_CERT_STATUS_B:
+            ret = ssl3_get_cert_status(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_CR_KEY_EXCH_A;
+            s->init_num = 0;
+            break;
+#endif
+
+        case SSL3_ST_CR_FINISHED_A:
+        case SSL3_ST_CR_FINISHED_B:
+            s->d1->change_cipher_spec_ok = 1;
+            ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
+                                    SSL3_ST_CR_FINISHED_B);
+            if (ret <= 0)
+                goto end;
+            dtls1_stop_timer(s);
+
+            if (s->hit)
+                s->state = SSL3_ST_CW_CHANGE_A;
+            else
+                s->state = SSL_ST_OK;
+
+#ifndef OPENSSL_NO_SCTP
+            if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
+                state == SSL_ST_RENEGOTIATE) {
+                s->d1->next_state = s->state;
+                s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
+            }
+#endif
+
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_CW_FLUSH:
+            s->rwstate = SSL_WRITING;
+            if (BIO_flush(s->wbio) <= 0) {
+                /*
+                 * If the write error was fatal, stop trying
+                 */
+                if (!BIO_should_retry(s->wbio)) {
+                    s->rwstate = SSL_NOTHING;
+                    s->state = s->s3->tmp.next_state;
+                }
+
+                ret = -1;
+                goto end;
+            }
+            s->rwstate = SSL_NOTHING;
+            s->state = s->s3->tmp.next_state;
+            break;
+
+        case SSL_ST_OK:
+            /* clean a few things up */
+            ssl3_cleanup_key_block(s);
+
+#if 0
+            if (s->init_buf != NULL) {
+                BUF_MEM_free(s->init_buf);
+                s->init_buf = NULL;
+            }
+#endif
+
+            /*
+             * If we are not 'joining' the last two packets, remove the
+             * buffering now
+             */
+            if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
+                ssl_free_wbio_buffer(s);
+            /* else do it later in ssl3_write */
+
+            s->init_num = 0;
+            s->renegotiate = 0;
+            s->new_session = 0;
+
+            ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
+            if (s->hit)
+                s->ctx->stats.sess_hit++;
+
+            ret = 1;
+            /* s->server=0; */
+            s->handshake_func = dtls1_connect;
+            s->ctx->stats.sess_connect_good++;
+
+            if (cb != NULL)
+                cb(s, SSL_CB_HANDSHAKE_DONE, 1);
+
+            /* done with handshaking */
+            s->d1->handshake_read_seq = 0;
+            s->d1->next_handshake_write_seq = 0;
+            dtls1_clear_received_buffer(s);
+            goto end;
+            /* break; */
+
+        case SSL_ST_ERR:
+        default:
+            SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
+            ret = -1;
+            goto end;
+            /* break; */
+        }
+
+        /* did we do anything */
+        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_CONNECT_LOOP, 1);
+                s->state = new_state;
+            }
+        }
+        skip = 0;
+    }
+ end:
+    s->in_handshake--;
+
+#ifndef OPENSSL_NO_SCTP
+    /*
+     * Notify SCTP BIO socket to leave handshake mode and allow stream
+     * identifier other than 0. Will be ignored if no SCTP is used.
+     */
+    BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
+             s->in_handshake, NULL);
+#endif
+
+    if (buf != NULL)
+        BUF_MEM_free(buf);
+    if (cb != NULL)
+        cb(s, SSL_CB_CONNECT_EXIT, ret);
+    return (ret);
+}
+
+static int dtls1_get_hello_verify(SSL *s)
+{
+    int n, al, ok = 0;
+    unsigned char *data;
+    unsigned int cookie_len;
+
+    s->first_packet = 1;
+    n = s->method->ssl_get_message(s,
+                                   DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
+                                   DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
+                                   -1, s->max_cert_list, &ok);
+    s->first_packet = 0;
+
+    if (!ok)
+        return ((int)n);
+
+    if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
+        s->d1->send_cookie = 0;
+        s->s3->tmp.reuse_message = 1;
+        return (1);
+    }
+
+    data = (unsigned char *)s->init_msg;
+#if 0
+    if (s->method->version != DTLS_ANY_VERSION &&
+        ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
+    {
+        SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
+        s->version = (s->version & 0xff00) | data[1];
+        al = SSL_AD_PROTOCOL_VERSION;
+        goto f_err;
+    }
+#endif
+    data += 2;
+
+    cookie_len = *(data++);
+    if (cookie_len > sizeof(s->d1->cookie)) {
+        al = SSL_AD_ILLEGAL_PARAMETER;
+        goto f_err;
+    }
+
+    memcpy(s->d1->cookie, data, cookie_len);
+    s->d1->cookie_len = cookie_len;
+
+    s->d1->send_cookie = 1;
+    return 1;
+
+ f_err:
+    ssl3_send_alert(s, SSL3_AL_FATAL, al);
+    s->state = SSL_ST_ERR;
+    return -1;
+}