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1 /* $OpenBSD: d1_clnt.c,v 1.81 2018/08/30 16:56:16 jsing Exp $ */
2 /*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
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
11 * are met:
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
19 * distribution.
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
36 * acknowledgment:
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
82 * are met:
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
108 * SUCH DAMAGE.
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.]
116 #include <limits.h>
117 #include <stdio.h>
119 #include "ssl_locl.h"
121 #include <openssl/bn.h>
122 #include <openssl/buffer.h>
123 #include <openssl/dh.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/objects.h>
128 #include "bytestring.h"
130 static const SSL_METHOD_INTERNAL DTLSv1_client_method_internal_data = {
131 .version = DTLS1_VERSION,
132 .min_version = DTLS1_VERSION,
133 .max_version = DTLS1_VERSION,
134 .ssl_new = dtls1_new,
135 .ssl_clear = dtls1_clear,
136 .ssl_free = dtls1_free,
137 .ssl_accept = ssl_undefined_function,
138 .ssl_connect = ssl3_connect,
139 .get_ssl_method = dtls1_get_client_method,
140 .get_timeout = dtls1_default_timeout,
141 .ssl_version = ssl_undefined_void_function,
142 .ssl_renegotiate = ssl3_renegotiate,
143 .ssl_renegotiate_check = ssl3_renegotiate_check,
144 .ssl_get_message = dtls1_get_message,
145 .ssl_read_bytes = dtls1_read_bytes,
146 .ssl_write_bytes = dtls1_write_app_data_bytes,
147 .ssl3_enc = &DTLSv1_enc_data,
150 static const SSL_METHOD DTLSv1_client_method_data = {
151 .ssl_dispatch_alert = dtls1_dispatch_alert,
152 .num_ciphers = ssl3_num_ciphers,
153 .get_cipher = dtls1_get_cipher,
154 .get_cipher_by_char = ssl3_get_cipher_by_char,
155 .put_cipher_by_char = ssl3_put_cipher_by_char,
156 .internal = &DTLSv1_client_method_internal_data,
159 const SSL_METHOD *
160 DTLSv1_client_method(void)
162 return &DTLSv1_client_method_data;
165 const SSL_METHOD *
166 dtls1_get_client_method(int ver)
168 if (ver == DTLS1_VERSION)
169 return (DTLSv1_client_method());
170 return (NULL);
174 dtls1_get_hello_verify(SSL *s)
176 long n;
177 int al, ok = 0;
178 size_t cookie_len;
179 uint16_t ssl_version;
180 CBS hello_verify_request, cookie;
182 n = s->method->internal->ssl_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
183 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok);
185 if (!ok)
186 return ((int)n);
188 if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
189 D1I(s)->send_cookie = 0;
190 S3I(s)->tmp.reuse_message = 1;
191 return (1);
194 if (n < 0)
195 goto truncated;
197 CBS_init(&hello_verify_request, s->internal->init_msg, n);
199 if (!CBS_get_u16(&hello_verify_request, &ssl_version))
200 goto truncated;
202 if (ssl_version != s->version) {
203 SSLerror(s, SSL_R_WRONG_SSL_VERSION);
204 s->version = (s->version & 0xff00) | (ssl_version & 0xff);
205 al = SSL_AD_PROTOCOL_VERSION;
206 goto f_err;
209 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie))
210 goto truncated;
212 if (!CBS_write_bytes(&cookie, D1I(s)->cookie,
213 sizeof(D1I(s)->cookie), &cookie_len)) {
214 D1I(s)->cookie_len = 0;
215 al = SSL_AD_ILLEGAL_PARAMETER;
216 goto f_err;
218 D1I(s)->cookie_len = cookie_len;
219 D1I(s)->send_cookie = 1;
221 return 1;
223 truncated:
224 al = SSL_AD_DECODE_ERROR;
225 f_err:
226 ssl3_send_alert(s, SSL3_AL_FATAL, al);
227 return -1;