ssl/d1_msg.c

   1 /*
   2  * DTLS implementation written by Nagendra Modadugu
   3  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1998-2015 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  59  * All rights reserved.
  60  *
  61  * This package is an SSL implementation written
  62  * by Eric Young (eay@cryptsoft.com).
  63  * The implementation was written so as to conform with Netscapes SSL.
  64  *
  65  * This library is free for commercial and non-commercial use as long as
  66  * the following conditions are aheared to.  The following conditions
  67  * apply to all code found in this distribution, be it the RC4, RSA,
  68  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  69  * included with this distribution is covered by the same copyright terms
  70  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  71  *
  72  * Copyright remains Eric Young's, and as such any Copyright notices in
  73  * the code are not to be removed.
  74  * If this package is used in a product, Eric Young should be given attribution
  75  * as the author of the parts of the library used.
  76  * This can be in the form of a textual message at program startup or
  77  * in documentation (online or textual) provided with the package.
  78  *
  79  * Redistribution and use in source and binary forms, with or without
  80  * modification, are permitted provided that the following conditions
  81  * are met:
  82  * 1. Redistributions of source code must retain the copyright
  83  *    notice, this list of conditions and the following disclaimer.
  84  * 2. Redistributions in binary form must reproduce the above copyright
  85  *    notice, this list of conditions and the following disclaimer in the
  86  *    documentation and/or other materials provided with the distribution.
  87  * 3. All advertising materials mentioning features or use of this software
  88  *    must display the following acknowledgement:
  89  *    "This product includes cryptographic software written by
  90  *     Eric Young (eay@cryptsoft.com)"
  91  *    The word 'cryptographic' can be left out if the rouines from the library
  92  *    being used are not cryptographic related :-).
  93  * 4. If you include any Windows specific code (or a derivative thereof) from
  94  *    the apps directory (application code) you must include an acknowledgement:
  95  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  96  *
  97  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  98  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  99  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 100  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 101  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 102  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 103  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 104  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 105  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 106  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 107  * SUCH DAMAGE.
 108  *
 109  * The licence and distribution terms for any publically available version or
 110  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 111  * copied and put under another distribution licence
 112  * [including the GNU Public Licence.]
 113  */
 114
 115 #define USE_SOCKETS
 116 #include "ssl_locl.h"
 117
 118 int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
 119 {
 120     int i;
 121
 122 #ifndef OPENSSL_NO_SCTP
 123     /*
 124      * Check if we have to continue an interrupted handshake for reading
 125      * belated app data with SCTP.
 126      */
 127     if ((SSL_in_init(s) && !ossl_statem_get_in_handshake(s)) ||
 128         (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 129          ossl_statem_in_sctp_read_sock(s)))
 130 #else
 131     if (SSL_in_init(s) && !ossl_statem_get_in_handshake(s))
 132 #endif
 133     {
 134         i = s->handshake_func(s);
 135         if (i < 0)
 136             return (i);
 137         if (i == 0) {
 138             SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,
 139                    SSL_R_SSL_HANDSHAKE_FAILURE);
 140             return -1;
 141         }
 142     }
 143
 144     if (len > SSL3_RT_MAX_PLAIN_LENGTH) {
 145         SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES, SSL_R_DTLS_MESSAGE_TOO_BIG);
 146         return -1;
 147     }
 148
 149     i = dtls1_write_bytes(s, type, buf_, len);
 150     return i;
 151 }
 152
 153 int dtls1_dispatch_alert(SSL *s)
 154 {
 155     int i, j;
 156     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 157     unsigned char buf[DTLS1_AL_HEADER_LENGTH];
 158     unsigned char *ptr = &buf[0];
 159
 160     s->s3->alert_dispatch = 0;
 161
 162     memset(buf, 0, sizeof(buf));
 163     *ptr++ = s->s3->send_alert[0];
 164     *ptr++ = s->s3->send_alert[1];
 165
 166 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 167     if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) {
 168         s2n(s->d1->handshake_read_seq, ptr);
 169         l2n3(s->d1->r_msg_hdr.frag_off, ptr);
 170     }
 171 #endif
 172
 173     i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
 174     if (i <= 0) {
 175         s->s3->alert_dispatch = 1;
 176         /* fprintf( stderr, "not done with alert\n" ); */
 177     } else {
 178         if (s->s3->send_alert[0] == SSL3_AL_FATAL
 179 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 180             || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 181 #endif
 182             )
 183             (void)BIO_flush(s->wbio);
 184
 185         if (s->msg_callback)
 186             s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
 187                             2, s, s->msg_callback_arg);
 188
 189         if (s->info_callback != NULL)
 190             cb = s->info_callback;
 191         else if (s->ctx->info_callback != NULL)
 192             cb = s->ctx->info_callback;
 193
 194         if (cb != NULL) {
 195             j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1];
 196             cb(s, SSL_CB_WRITE_ALERT, j);
 197         }
 198     }
 199     return (i);
 200 }