lib/libssl/d1_clnt.c

   1 /* $OpenBSD: d1_clnt.c,v 1.79 2017/10/10 15:13:26 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.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  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.
  20  *
  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/)"
  25  *
  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.
  30  *
  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.
  34  *
  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/)"
  39  *
  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  * ====================================================================
  53  *
  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).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  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.
  65  *
  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).
  72  *
  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.
  79  *
  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)"
  97  *
  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.
 109  *
 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.]
 114  */
 115
 116 #include <limits.h>
 117 #include <stdio.h>
 118
 119 #include "ssl_locl.h"
 120
 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>
 127
 128 #include "bytestring.h"
 129
 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         .ssl_read = ssl3_read,
 140         .ssl_peek = ssl3_peek,
 141         .ssl_write = ssl3_write,
 142         .ssl_shutdown = dtls1_shutdown,
 143         .ssl_pending = ssl3_pending,
 144         .get_ssl_method = dtls1_get_client_method,
 145         .get_timeout = dtls1_default_timeout,
 146         .ssl_version = ssl_undefined_void_function,
 147         .ssl_renegotiate = ssl3_renegotiate,
 148         .ssl_renegotiate_check = ssl3_renegotiate_check,
 149         .ssl_get_message = dtls1_get_message,
 150         .ssl_read_bytes = dtls1_read_bytes,
 151         .ssl_write_bytes = dtls1_write_app_data_bytes,
 152         .ssl3_enc = &DTLSv1_enc_data,
 153 };
 154
 155 static const SSL_METHOD DTLSv1_client_method_data = {
 156         .ssl_dispatch_alert = dtls1_dispatch_alert,
 157         .num_ciphers = ssl3_num_ciphers,
 158         .get_cipher = dtls1_get_cipher,
 159         .get_cipher_by_char = ssl3_get_cipher_by_char,
 160         .put_cipher_by_char = ssl3_put_cipher_by_char,
 161         .internal = &DTLSv1_client_method_internal_data,
 162 };
 163
 164 const SSL_METHOD *
 165 DTLSv1_client_method(void)
 166 {
 167         return &DTLSv1_client_method_data;
 168 }
 169
 170 const SSL_METHOD *
 171 dtls1_get_client_method(int ver)
 172 {
 173         if (ver == DTLS1_VERSION)
 174                 return (DTLSv1_client_method());
 175         return (NULL);
 176 }
 177
 178 int
 179 dtls1_get_hello_verify(SSL *s)
 180 {
 181         long n;
 182         int al, ok = 0;
 183         size_t cookie_len;
 184         uint16_t ssl_version;
 185         CBS hello_verify_request, cookie;
 186
 187         n = s->method->internal->ssl_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 188             DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok);
 189
 190         if (!ok)
 191                 return ((int)n);
 192
 193         if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 194                 D1I(s)->send_cookie = 0;
 195                 S3I(s)->tmp.reuse_message = 1;
 196                 return (1);
 197         }
 198
 199         if (n < 0)
 200                 goto truncated;
 201
 202         CBS_init(&hello_verify_request, s->internal->init_msg, n);
 203
 204         if (!CBS_get_u16(&hello_verify_request, &ssl_version))
 205                 goto truncated;
 206
 207         if (ssl_version != s->version) {
 208                 SSLerror(s, SSL_R_WRONG_SSL_VERSION);
 209                 s->version = (s->version & 0xff00) | (ssl_version & 0xff);
 210                 al = SSL_AD_PROTOCOL_VERSION;
 211                 goto f_err;
 212         }
 213
 214         if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie))
 215                 goto truncated;
 216
 217         if (!CBS_write_bytes(&cookie, D1I(s)->cookie,
 218             sizeof(D1I(s)->cookie), &cookie_len)) {
 219                 D1I(s)->cookie_len = 0;
 220                 al = SSL_AD_ILLEGAL_PARAMETER;
 221                 goto f_err;
 222         }
 223         D1I(s)->cookie_len = cookie_len;
 224         D1I(s)->send_cookie = 1;
 225
 226         return 1;
 227
 228 truncated:
 229         al = SSL_AD_DECODE_ERROR;
 230 f_err:
 231         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 232         return -1;
 233 }