inital commit

1 files changed, 981 insertions, 0 deletions

diff --git a/openssl/ssl/d1_srvr.c b/openssl/ssl/d1_srvr.c
new file mode 100644
index 0000000..bc875b5
--- /dev/null
+++ b/openssl/ssl/d1_srvr.c
@@ -0,0 +1,981 @@
+/* ssl/d1_srvr.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"
+#include <openssl/buffer.h>
+#include <openssl/rand.h>
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#include <openssl/x509.h>
+#include <openssl/md5.h>
+#include <openssl/bn.h>
+#ifndef OPENSSL_NO_DH
+# include <openssl/dh.h>
+#endif
+
+static const SSL_METHOD *dtls1_get_server_method(int ver);
+static int dtls1_send_hello_verify_request(SSL *s);
+
+static const SSL_METHOD *dtls1_get_server_method(int ver)
+{
+    if (ver == DTLS_ANY_VERSION)
+        return DTLS_server_method();
+    else if (ver == DTLS1_VERSION)
+        return DTLSv1_server_method();
+    else if (ver == DTLS1_2_VERSION)
+        return DTLSv1_2_server_method();
+    else
+        return NULL;
+}
+
+IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
+                          DTLSv1_server_method,
+                          dtls1_accept,
+                          ssl_undefined_function,
+                          dtls1_get_server_method, DTLSv1_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
+                          DTLSv1_2_server_method,
+                          dtls1_accept,
+                          ssl_undefined_function,
+                          dtls1_get_server_method, DTLSv1_2_enc_data)
+
+IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
+                          DTLS_server_method,
+                          dtls1_accept,
+                          ssl_undefined_function,
+                          dtls1_get_server_method, DTLSv1_2_enc_data)
+
+int dtls1_accept(SSL *s)
+{
+    BUF_MEM *buf;
+    unsigned long Time = (unsigned long)time(NULL);
+    void (*cb) (const SSL *ssl, int type, int val) = NULL;
+    unsigned long alg_k;
+    int ret = -1;
+    int new_state, state, skip = 0;
+    int listen;
+#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;
+
+    listen = s->d1->listen;
+
+    /* init things to blank */
+    s->in_handshake++;
+    if (!SSL_in_init(s) || SSL_in_before(s))
+        SSL_clear(s);
+
+    s->d1->listen = listen;
+#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
+
+    if (s->cert == NULL) {
+        SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
+        return (-1);
+    }
+#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_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;
+                    s->state = SSL_ST_ERR;
+                    goto end;
+                }
+                if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
+                    BUF_MEM_free(buf);
+                    ret = -1;
+                    s->state = SSL_ST_ERR;
+                    goto end;
+                }
+                s->init_buf = buf;
+            }
+
+            if (!ssl3_setup_buffers(s)) {
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            s->init_num = 0;
+            s->d1->change_cipher_spec_ok = 0;
+            /*
+             * Should have been reset by ssl3_get_finished, too.
+             */
+            s->s3->change_cipher_spec = 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 :-) ...but not with
+                 * SCTP :-)
+                 */
+#ifndef OPENSSL_NO_SCTP
+                if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
+#endif
+                    if (!ssl_init_wbio_buffer(s, 1)) {
+                        ret = -1;
+                        s->state = SSL_ST_ERR;
+                        goto end;
+                    }
+
+                ssl3_init_finished_mac(s);
+                s->state = SSL3_ST_SR_CLNT_HELLO_A;
+                s->ctx->stats.sess_accept++;
+            } else if (!s->s3->send_connection_binding &&
+                       !(s->options &
+                         SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
+                /*
+                 * Server attempting to renegotiate with client that doesn't
+                 * support secure renegotiation.
+                 */
+                SSLerr(SSL_F_DTLS1_ACCEPT,
+                       SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
+                ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
+                ret = -1;
+                s->state = SSL_ST_ERR;
+                goto end;
+            } 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;
+            }
+
+            break;
+
+        case SSL3_ST_SW_HELLO_REQ_A:
+        case SSL3_ST_SW_HELLO_REQ_B:
+
+            s->shutdown = 0;
+            dtls1_clear_sent_buffer(s);
+            dtls1_start_timer(s);
+            ret = ssl3_send_hello_request(s);
+            if (ret <= 0)
+                goto end;
+            s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
+            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;
+            dtls1_stop_timer(s);
+
+            if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
+                s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
+            else
+                s->state = SSL3_ST_SW_SRVR_HELLO_A;
+
+            s->init_num = 0;
+
+            /*
+             * Reflect ClientHello sequence to remain stateless while
+             * listening
+             */
+            if (listen) {
+                memcpy(s->s3->write_sequence, s->s3->read_sequence,
+                       sizeof(s->s3->write_sequence));
+            }
+
+            /* If we're just listening, stop here */
+            if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
+                ret = 2;
+                s->d1->listen = 0;
+                /*
+                 * Set expected sequence numbers to continue the handshake.
+                 */
+                s->d1->handshake_read_seq = 2;
+                s->d1->handshake_write_seq = 1;
+                s->d1->next_handshake_write_seq = 1;
+                goto end;
+            }
+
+            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->state = SSL3_ST_SW_FLUSH;
+            s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
+
+            /* HelloVerifyRequest resets Finished MAC */
+            if (s->version != DTLS1_BAD_VER)
+                ssl3_init_finished_mac(s);
+            break;
+
+#ifndef OPENSSL_NO_SCTP
+        case DTLS1_SCTP_ST_SR_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 = SSL3_ST_SR_FINISHED_A;
+            break;
+
+        case DTLS1_SCTP_ST_SW_WRITE_SOCK:
+            ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
+            if (ret < 0)
+                goto end;
+
+            if (ret == 0) {
+                if (s->d1->next_state != SSL_ST_OK) {
+                    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_SW_SRVR_HELLO_A:
+        case SSL3_ST_SW_SRVR_HELLO_B:
+            s->renegotiate = 2;
+            dtls1_start_timer(s);
+            ret = ssl3_send_server_hello(s);
+            if (ret <= 0)
+                goto end;
+
+            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
+#ifndef OPENSSL_NO_TLSEXT
+                if (s->tlsext_ticket_expected)
+                    s->state = SSL3_ST_SW_SESSION_TICKET_A;
+                else
+                    s->state = SSL3_ST_SW_CHANGE_A;
+#else
+                s->state = SSL3_ST_SW_CHANGE_A;
+#endif
+            } 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 or normal PSK */
+            if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
+                && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
+                dtls1_start_timer(s);
+                ret = ssl3_send_server_certificate(s);
+                if (ret <= 0)
+                    goto end;
+#ifndef OPENSSL_NO_TLSEXT
+                if (s->tlsext_status_expected)
+                    s->state = SSL3_ST_SW_CERT_STATUS_A;
+                else
+                    s->state = SSL3_ST_SW_KEY_EXCH_A;
+            } else {
+                skip = 1;
+                s->state = SSL3_ST_SW_KEY_EXCH_A;
+            }
+#else
+            } else
+                skip = 1;
+
+            s->state = SSL3_ST_SW_KEY_EXCH_A;
+#endif
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_SW_KEY_EXCH_A:
+        case SSL3_ST_SW_KEY_EXCH_B:
+            alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+
+            /*
+             * clear this, it may get reset by
+             * send_server_key_exchange
+             */
+            s->s3->tmp.use_rsa_tmp = 0;
+
+            /*
+             * only send if a DH key exchange or RSA but we have a sign only
+             * certificate
+             */
+            if (0
+                /*
+                 * PSK: send ServerKeyExchange if PSK identity hint if
+                 * provided
+                 */
+#ifndef OPENSSL_NO_PSK
+                || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
+#endif
+                || (alg_k & SSL_kDHE)
+                || (alg_k & SSL_kEECDH)
+                || ((alg_k & 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)
+                        )
+                    )
+                )
+                ) {
+                dtls1_start_timer(s);
+                ret = ssl3_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->algorithm_auth & 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->algorithm_auth & SSL_aKRB5)
+                   /*
+                    * With normal PSK Certificates and Certificate Requests
+                    * are omitted
+                    */
+                   || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
+                /* no cert request */
+                skip = 1;
+                s->s3->tmp.cert_request = 0;
+                s->state = SSL3_ST_SW_SRVR_DONE_A;
+#ifndef OPENSSL_NO_SCTP
+                if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                    s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
+                    s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
+                }
+#endif
+            } else {
+                s->s3->tmp.cert_request = 1;
+                dtls1_start_timer(s);
+                ret = ssl3_send_certificate_request(s);
+                if (ret <= 0)
+                    goto end;
+#ifndef NETSCAPE_HANG_BUG
+                s->state = SSL3_ST_SW_SRVR_DONE_A;
+# ifndef OPENSSL_NO_SCTP
+                if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
+                    s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
+                    s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
+                }
+# endif
+#else
+                s->state = SSL3_ST_SW_FLUSH;
+                s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
+# 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_SW_WRITE_SOCK;
+                }
+# endif
+#endif
+                s->init_num = 0;
+            }
+            break;
+
+        case SSL3_ST_SW_SRVR_DONE_A:
+        case SSL3_ST_SW_SRVR_DONE_B:
+            dtls1_start_timer(s);
+            ret = ssl3_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:
+            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 SSL3_ST_SR_CERT_A:
+        case SSL3_ST_SR_CERT_B:
+            if (s->s3->tmp.cert_request) {
+                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;
+#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_SR_CERT_VRFY_A;
+            s->init_num = 0;
+
+            if (ret == 2) {
+                /*
+                 * For the ECDH ciphersuites when the client sends its ECDH
+                 * pub key in a certificate, the CertificateVerify message is
+                 * not sent.
+                 */
+                s->state = SSL3_ST_SR_FINISHED_A;
+                s->init_num = 0;
+            } else if (SSL_USE_SIGALGS(s)) {
+                s->state = SSL3_ST_SR_CERT_VRFY_A;
+                s->init_num = 0;
+                if (!s->session->peer)
+                    break;
+                /*
+                 * For sigalgs freeze the handshake buffer at this point and
+                 * digest cached records.
+                 */
+                if (!s->s3->handshake_buffer) {
+                    SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
+                    s->state = SSL_ST_ERR;
+                    return -1;
+                }
+                s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
+                if (!ssl3_digest_cached_records(s)) {
+                    s->state = SSL_ST_ERR;
+                    return -1;
+                }
+            } else {
+                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,
+                                                     NID_md5,
+                                                     &(s->s3->
+                                                       tmp.cert_verify_md
+                                                       [0]));
+                s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
+                                                     &(s->s3->
+                                                       tmp.cert_verify_md
+                                                       [MD5_DIGEST_LENGTH]));
+            }
+            break;
+
+        case SSL3_ST_SR_CERT_VRFY_A:
+        case SSL3_ST_SR_CERT_VRFY_B:
+            ret = ssl3_get_cert_verify(s);
+            if (ret <= 0)
+                goto end;
+#ifndef OPENSSL_NO_SCTP
+            if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
+                state == SSL_ST_RENEGOTIATE)
+                s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
+            else
+#endif
+                s->state = SSL3_ST_SR_FINISHED_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_SR_FINISHED_A:
+        case SSL3_ST_SR_FINISHED_B:
+            /*
+             * Enable CCS. Receiving a CCS clears the flag, so make
+             * sure not to re-enable it to ban duplicates. This *should* be the
+             * first time we have received one - but we check anyway to be
+             * cautious.
+             * s->s3->change_cipher_spec is set when a CCS is
+             * processed in d1_pkt.c, and remains set until
+             * the client's Finished message is read.
+             */
+            if (!s->s3->change_cipher_spec)
+                s->d1->change_cipher_spec_ok = 1;
+            ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
+                                    SSL3_ST_SR_FINISHED_B);
+            if (ret <= 0)
+                goto end;
+            dtls1_stop_timer(s);
+            if (s->hit)
+                s->state = SSL_ST_OK;
+#ifndef OPENSSL_NO_TLSEXT
+            else if (s->tlsext_ticket_expected)
+                s->state = SSL3_ST_SW_SESSION_TICKET_A;
+#endif
+            else
+                s->state = SSL3_ST_SW_CHANGE_A;
+            s->init_num = 0;
+            break;
+
+#ifndef OPENSSL_NO_TLSEXT
+        case SSL3_ST_SW_SESSION_TICKET_A:
+        case SSL3_ST_SW_SESSION_TICKET_B:
+            ret = ssl3_send_newsession_ticket(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_SW_CHANGE_A;
+            s->init_num = 0;
+            break;
+
+        case SSL3_ST_SW_CERT_STATUS_A:
+        case SSL3_ST_SW_CERT_STATUS_B:
+            ret = ssl3_send_cert_status(s);
+            if (ret <= 0)
+                goto end;
+            s->state = SSL3_ST_SW_KEY_EXCH_A;
+            s->init_num = 0;
+            break;
+
+#endif
+
+        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;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            ret = dtls1_send_change_cipher_spec(s,
+                                                SSL3_ST_SW_CHANGE_A,
+                                                SSL3_ST_SW_CHANGE_B);
+
+            if (ret <= 0)
+                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
+
+            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;
+                s->state = SSL_ST_ERR;
+                goto end;
+            }
+
+            dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
+            break;
+
+        case SSL3_ST_SW_FINISHED_A:
+        case SSL3_ST_SW_FINISHED_B:
+            ret = ssl3_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;
+
+#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
+            } else {
+                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_SW_WRITE_SOCK;
+                }
+#endif
+            }
+            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->renegotiate == 2) { /* skipped if we just sent a
+                                        * HelloRequest */
+                s->renegotiate = 0;
+                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;
+            s->d1->next_handshake_write_seq = 0;
+            dtls1_clear_received_buffer(s);
+            goto end;
+            /* break; */
+
+        case SSL_ST_ERR:
+        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--;
+#ifndef OPENSSL_NO_SCTP
+    /*
+     * Notify SCTP BIO socket to leave 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
+
+    if (cb != NULL)
+        cb(s, SSL_CB_ACCEPT_EXIT, ret);
+    return (ret);
+}
+
+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]);
+        /* Always use DTLS 1.0 version: see RFC 6347 */
+        *(p++) = DTLS1_VERSION >> 8;
+        *(p++) = DTLS1_VERSION & 0xFF;
+
+        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);
+            s->state = SSL_ST_ERR;
+            return 0;
+        }
+
+        *(p++) = (unsigned char)s->d1->cookie_len;
+        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;
+    }
+
+    /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
+    return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
+}