1 /* $OpenBSD: d1_srvr.c,v 1.91 2017/10/12 15:52:50 jsing Exp $ */
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
118 #include "ssl_locl.h"
120 #include <openssl/bn.h>
121 #include <openssl/buffer.h>
122 #include <openssl/dh.h>
123 #include <openssl/evp.h>
124 #include <openssl/md5.h>
125 #include <openssl/objects.h>
126 #include <openssl/x509.h>
128 static const SSL_METHOD_INTERNAL DTLSv1_server_method_internal_data
= {
129 .version
= DTLS1_VERSION
,
130 .min_version
= DTLS1_VERSION
,
131 .max_version
= DTLS1_VERSION
,
132 .ssl_new
= dtls1_new
,
133 .ssl_clear
= dtls1_clear
,
134 .ssl_free
= dtls1_free
,
135 .ssl_accept
= ssl3_accept
,
136 .ssl_connect
= ssl_undefined_function
,
137 .ssl_read
= ssl3_read
,
138 .ssl_peek
= ssl3_peek
,
139 .ssl_write
= ssl3_write
,
140 .ssl_shutdown
= dtls1_shutdown
,
141 .ssl_pending
= ssl3_pending
,
142 .get_ssl_method
= dtls1_get_server_method
,
143 .get_timeout
= dtls1_default_timeout
,
144 .ssl_version
= ssl_undefined_void_function
,
145 .ssl_renegotiate
= ssl3_renegotiate
,
146 .ssl_renegotiate_check
= ssl3_renegotiate_check
,
147 .ssl_get_message
= dtls1_get_message
,
148 .ssl_read_bytes
= dtls1_read_bytes
,
149 .ssl_write_bytes
= dtls1_write_app_data_bytes
,
150 .ssl3_enc
= &DTLSv1_enc_data
,
153 static const SSL_METHOD DTLSv1_server_method_data
= {
154 .ssl_dispatch_alert
= dtls1_dispatch_alert
,
155 .num_ciphers
= ssl3_num_ciphers
,
156 .get_cipher
= dtls1_get_cipher
,
157 .get_cipher_by_char
= ssl3_get_cipher_by_char
,
158 .put_cipher_by_char
= ssl3_put_cipher_by_char
,
159 .internal
= &DTLSv1_server_method_internal_data
,
163 DTLSv1_server_method(void)
165 return &DTLSv1_server_method_data
;
169 dtls1_get_server_method(int ver
)
171 if (ver
== DTLS1_VERSION
)
172 return (DTLSv1_server_method());
177 dtls1_send_hello_verify_request(SSL
*s
)
179 CBB cbb
, verify
, cookie
;
181 memset(&cbb
, 0, sizeof(cbb
));
183 if (S3I(s
)->hs
.state
== DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
) {
184 if (s
->ctx
->internal
->app_gen_cookie_cb
== NULL
||
185 s
->ctx
->internal
->app_gen_cookie_cb(s
, D1I(s
)->cookie
,
186 &(D1I(s
)->cookie_len
)) == 0) {
187 SSLerror(s
, ERR_R_INTERNAL_ERROR
);
191 if (!ssl3_handshake_msg_start_cbb(s
, &cbb
, &verify
,
192 DTLS1_MT_HELLO_VERIFY_REQUEST
))
194 if (!CBB_add_u16(&verify
, s
->version
))
196 if (!CBB_add_u8_length_prefixed(&verify
, &cookie
))
198 if (!CBB_add_bytes(&cookie
, D1I(s
)->cookie
, D1I(s
)->cookie_len
))
200 if (!ssl3_handshake_msg_finish_cbb(s
, &cbb
))
203 S3I(s
)->hs
.state
= DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
;
206 /* S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
207 return (ssl3_handshake_write(s
));