980 lines
34 KiB
C
980 lines
34 KiB
C
/* ssl/d1_srvr.c */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/buffer.h>
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#include <openssl/rand.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/md5.h>
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#include <openssl/bn.h>
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#ifndef OPENSSL_NO_DH
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# include <openssl/dh.h>
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#endif
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static const SSL_METHOD *dtls1_get_server_method(int ver);
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static int dtls1_send_hello_verify_request(SSL *s);
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static const SSL_METHOD *dtls1_get_server_method(int ver)
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{
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if (ver == DTLS_ANY_VERSION)
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return DTLS_server_method();
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else if (ver == DTLS1_VERSION)
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return DTLSv1_server_method();
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else if (ver == DTLS1_2_VERSION)
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return DTLSv1_2_server_method();
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else
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return NULL;
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}
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IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
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DTLSv1_server_method,
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dtls1_accept,
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ssl_undefined_function,
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dtls1_get_server_method, DTLSv1_enc_data)
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IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
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DTLSv1_2_server_method,
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dtls1_accept,
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ssl_undefined_function,
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dtls1_get_server_method, DTLSv1_2_enc_data)
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IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
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DTLS_server_method,
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dtls1_accept,
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ssl_undefined_function,
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dtls1_get_server_method, DTLSv1_2_enc_data)
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int dtls1_accept(SSL *s)
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{
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BUF_MEM *buf;
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unsigned long Time = (unsigned long)time(NULL);
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void (*cb) (const SSL *ssl, int type, int val) = NULL;
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unsigned long alg_k;
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int ret = -1;
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int new_state, state, skip = 0;
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int listen;
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#ifndef OPENSSL_NO_SCTP
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unsigned char sctpauthkey[64];
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char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
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#endif
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RAND_add(&Time, sizeof(Time), 0);
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ERR_clear_error();
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clear_sys_error();
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if (s->info_callback != NULL)
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cb = s->info_callback;
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else if (s->ctx->info_callback != NULL)
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cb = s->ctx->info_callback;
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listen = s->d1->listen;
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/* init things to blank */
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s->in_handshake++;
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if (!SSL_in_init(s) || SSL_in_before(s))
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SSL_clear(s);
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s->d1->listen = listen;
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#ifndef OPENSSL_NO_SCTP
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/*
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* Notify SCTP BIO socket to enter handshake mode and prevent stream
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* identifier other than 0. Will be ignored if no SCTP is used.
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*/
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BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
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s->in_handshake, NULL);
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#endif
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if (s->cert == NULL) {
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SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET);
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return (-1);
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}
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#ifndef OPENSSL_NO_HEARTBEATS
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/*
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* If we're awaiting a HeartbeatResponse, pretend we already got and
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* don't await it anymore, because Heartbeats don't make sense during
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* handshakes anyway.
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*/
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if (s->tlsext_hb_pending) {
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dtls1_stop_timer(s);
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s->tlsext_hb_pending = 0;
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s->tlsext_hb_seq++;
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}
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#endif
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for (;;) {
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state = s->state;
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switch (s->state) {
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case SSL_ST_RENEGOTIATE:
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s->renegotiate = 1;
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/* s->state=SSL_ST_ACCEPT; */
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case SSL_ST_BEFORE:
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case SSL_ST_ACCEPT:
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case SSL_ST_BEFORE | SSL_ST_ACCEPT:
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case SSL_ST_OK | SSL_ST_ACCEPT:
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s->server = 1;
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if (cb != NULL)
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cb(s, SSL_CB_HANDSHAKE_START, 1);
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if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
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SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
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return -1;
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}
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s->type = SSL_ST_ACCEPT;
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if (s->init_buf == NULL) {
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if ((buf = BUF_MEM_new()) == NULL) {
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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}
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if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
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BUF_MEM_free(buf);
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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}
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s->init_buf = buf;
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}
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if (!ssl3_setup_buffers(s)) {
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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}
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s->init_num = 0;
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s->d1->change_cipher_spec_ok = 0;
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/*
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* Should have been reset by ssl3_get_finished, too.
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*/
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s->s3->change_cipher_spec = 0;
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if (s->state != SSL_ST_RENEGOTIATE) {
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/*
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* Ok, we now need to push on a buffering BIO so that the
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* output is sent in a way that TCP likes :-) ...but not with
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* SCTP :-)
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*/
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#ifndef OPENSSL_NO_SCTP
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if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
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#endif
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if (!ssl_init_wbio_buffer(s, 1)) {
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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}
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ssl3_init_finished_mac(s);
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s->state = SSL3_ST_SR_CLNT_HELLO_A;
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s->ctx->stats.sess_accept++;
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} else if (!s->s3->send_connection_binding &&
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!(s->options &
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SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
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/*
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* Server attempting to renegotiate with client that doesn't
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* support secure renegotiation.
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*/
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SSLerr(SSL_F_DTLS1_ACCEPT,
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SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
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ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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} else {
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/*
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* s->state == SSL_ST_RENEGOTIATE, we will just send a
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* HelloRequest
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*/
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s->ctx->stats.sess_accept_renegotiate++;
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s->state = SSL3_ST_SW_HELLO_REQ_A;
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}
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break;
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case SSL3_ST_SW_HELLO_REQ_A:
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case SSL3_ST_SW_HELLO_REQ_B:
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s->shutdown = 0;
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dtls1_clear_record_buffer(s);
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dtls1_start_timer(s);
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ret = ssl3_send_hello_request(s);
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if (ret <= 0)
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goto end;
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s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
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s->state = SSL3_ST_SW_FLUSH;
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s->init_num = 0;
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ssl3_init_finished_mac(s);
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break;
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case SSL3_ST_SW_HELLO_REQ_C:
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s->state = SSL_ST_OK;
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break;
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case SSL3_ST_SR_CLNT_HELLO_A:
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case SSL3_ST_SR_CLNT_HELLO_B:
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case SSL3_ST_SR_CLNT_HELLO_C:
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s->shutdown = 0;
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ret = ssl3_get_client_hello(s);
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if (ret <= 0)
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goto end;
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dtls1_stop_timer(s);
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if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
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s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
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else
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s->state = SSL3_ST_SW_SRVR_HELLO_A;
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s->init_num = 0;
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/*
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* Reflect ClientHello sequence to remain stateless while
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* listening
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*/
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if (listen) {
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memcpy(s->s3->write_sequence, s->s3->read_sequence,
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sizeof(s->s3->write_sequence));
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}
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/* If we're just listening, stop here */
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if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) {
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ret = 2;
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s->d1->listen = 0;
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/*
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* Set expected sequence numbers to continue the handshake.
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*/
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s->d1->handshake_read_seq = 2;
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s->d1->handshake_write_seq = 1;
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s->d1->next_handshake_write_seq = 1;
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goto end;
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}
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break;
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case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
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case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
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ret = dtls1_send_hello_verify_request(s);
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if (ret <= 0)
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goto end;
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s->state = SSL3_ST_SW_FLUSH;
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s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
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/* HelloVerifyRequest resets Finished MAC */
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if (s->version != DTLS1_BAD_VER)
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ssl3_init_finished_mac(s);
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break;
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#ifndef OPENSSL_NO_SCTP
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case DTLS1_SCTP_ST_SR_READ_SOCK:
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if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
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s->s3->in_read_app_data = 2;
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s->rwstate = SSL_READING;
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BIO_clear_retry_flags(SSL_get_rbio(s));
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BIO_set_retry_read(SSL_get_rbio(s));
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ret = -1;
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goto end;
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}
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s->state = SSL3_ST_SR_FINISHED_A;
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break;
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case DTLS1_SCTP_ST_SW_WRITE_SOCK:
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ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
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if (ret < 0)
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goto end;
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if (ret == 0) {
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if (s->d1->next_state != SSL_ST_OK) {
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s->s3->in_read_app_data = 2;
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s->rwstate = SSL_READING;
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BIO_clear_retry_flags(SSL_get_rbio(s));
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BIO_set_retry_read(SSL_get_rbio(s));
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ret = -1;
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goto end;
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}
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}
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s->state = s->d1->next_state;
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break;
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#endif
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case SSL3_ST_SW_SRVR_HELLO_A:
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case SSL3_ST_SW_SRVR_HELLO_B:
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s->renegotiate = 2;
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dtls1_start_timer(s);
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ret = ssl3_send_server_hello(s);
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if (ret <= 0)
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goto end;
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if (s->hit) {
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#ifndef OPENSSL_NO_SCTP
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/*
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* Add new shared key for SCTP-Auth, will be ignored if no
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* SCTP used.
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*/
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snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
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DTLS1_SCTP_AUTH_LABEL);
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if (SSL_export_keying_material(s, sctpauthkey,
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sizeof(sctpauthkey), labelbuffer,
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sizeof(labelbuffer), NULL, 0, 0) <= 0) {
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ret = -1;
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s->state = SSL_ST_ERR;
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goto end;
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}
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BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
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sizeof(sctpauthkey), sctpauthkey);
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#endif
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#ifndef OPENSSL_NO_TLSEXT
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if (s->tlsext_ticket_expected)
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s->state = SSL3_ST_SW_SESSION_TICKET_A;
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else
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s->state = SSL3_ST_SW_CHANGE_A;
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#else
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s->state = SSL3_ST_SW_CHANGE_A;
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#endif
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} else
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s->state = SSL3_ST_SW_CERT_A;
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s->init_num = 0;
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break;
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case SSL3_ST_SW_CERT_A:
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case SSL3_ST_SW_CERT_B:
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/* Check if it is anon DH or normal PSK */
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if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
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&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
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dtls1_start_timer(s);
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ret = ssl3_send_server_certificate(s);
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if (ret <= 0)
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goto end;
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#ifndef OPENSSL_NO_TLSEXT
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if (s->tlsext_status_expected)
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s->state = SSL3_ST_SW_CERT_STATUS_A;
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else
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s->state = SSL3_ST_SW_KEY_EXCH_A;
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} else {
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skip = 1;
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s->state = SSL3_ST_SW_KEY_EXCH_A;
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}
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#else
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} 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;
|
|
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));
|
|
}
|