ssl/s3_msg.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57 /* ====================================================================
  58  * Copyright (c) 1998-2015 The OpenSSL Project.  All rights reserved.
  59  *
  60  * Redistribution and use in source and binary forms, with or without
  61  * modification, are permitted provided that the following conditions
  62  * are met:
  63  *
  64  * 1. Redistributions of source code must retain the above copyright
  65  *    notice, this list of conditions and the following disclaimer.
  66  *
  67  * 2. Redistributions in binary form must reproduce the above copyright
  68  *    notice, this list of conditions and the following disclaimer in
  69  *    the documentation and/or other materials provided with the
  70  *    distribution.
  71  *
  72  * 3. All advertising materials mentioning features or use of this
  73  *    software must display the following acknowledgment:
  74  *    "This product includes software developed by the OpenSSL Project
  75  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  76  *
  77  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  78  *    endorse or promote products derived from this software without
  79  *    prior written permission. For written permission, please contact
  80  *    openssl-core@openssl.org.
  81  *
  82  * 5. Products derived from this software may not be called "OpenSSL"
  83  *    nor may "OpenSSL" appear in their names without prior written
  84  *    permission of the OpenSSL Project.
  85  *
  86  * 6. Redistributions of any form whatsoever must retain the following
  87  *    acknowledgment:
  88  *    "This product includes software developed by the OpenSSL Project
  89  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  90  *
  91  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  92  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  93  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  94  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  95  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  96  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  97  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  98  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 100  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 101  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 102  * OF THE POSSIBILITY OF SUCH DAMAGE.
 103  * ====================================================================
 104  *
 105  * This product includes cryptographic software written by Eric Young
 106  * (eay@cryptsoft.com).  This product includes software written by Tim
 107  * Hudson (tjh@cryptsoft.com).
 108  *
 109  */
 110
 111 #define USE_SOCKETS
 112 #include "ssl_locl.h"
 113
 114 int ssl3_do_change_cipher_spec(SSL *s)
 115 {
 116     int i;
 117     const char *sender;
 118     int slen;
 119
 120     if (s->server)
 121         i = SSL3_CHANGE_CIPHER_SERVER_READ;
 122     else
 123         i = SSL3_CHANGE_CIPHER_CLIENT_READ;
 124
 125     if (s->s3->tmp.key_block == NULL) {
 126         if (s->session == NULL || s->session->master_key_length == 0) {
 127             /* might happen if dtls1_read_bytes() calls this */
 128             SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,
 129                    SSL_R_CCS_RECEIVED_EARLY);
 130             return (0);
 131         }
 132
 133         s->session->cipher = s->s3->tmp.new_cipher;
 134         if (!s->method->ssl3_enc->setup_key_block(s))
 135             return (0);
 136     }
 137
 138     if (!s->method->ssl3_enc->change_cipher_state(s, i))
 139         return (0);
 140
 141     /*
 142      * we have to record the message digest at this point so we can get it
 143      * before we read the finished message
 144      */
 145     if (!s->server) {
 146         sender = s->method->ssl3_enc->server_finished_label;
 147         slen = s->method->ssl3_enc->server_finished_label_len;
 148     } else {
 149         sender = s->method->ssl3_enc->client_finished_label;
 150         slen = s->method->ssl3_enc->client_finished_label_len;
 151     }
 152
 153     i = s->method->ssl3_enc->final_finish_mac(s,
 154                                               sender, slen,
 155                                               s->s3->tmp.peer_finish_md);
 156     if (i == 0) {
 157         SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
 158         return 0;
 159     }
 160     s->s3->tmp.peer_finish_md_len = i;
 161
 162     return (1);
 163 }
 164
 165 int ssl3_send_alert(SSL *s, int level, int desc)
 166 {
 167     /* Map tls/ssl alert value to correct one */
 168     desc = s->method->ssl3_enc->alert_value(desc);
 169     if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
 170         desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
 171                                           * protocol_version alerts */
 172     if (desc < 0)
 173         return -1;
 174     /* If a fatal one, remove from cache */
 175     if ((level == SSL3_AL_FATAL) && (s->session != NULL))
 176         SSL_CTX_remove_session(s->ctx, s->session);
 177
 178     s->s3->alert_dispatch = 1;
 179     s->s3->send_alert[0] = level;
 180     s->s3->send_alert[1] = desc;
 181     if (!RECORD_LAYER_write_pending(&s->rlayer)) {
 182         /* data still being written out? */
 183         return s->method->ssl_dispatch_alert(s);
 184     }
 185     /*
 186      * else data is still being written out, we will get written some time in
 187      * the future
 188      */
 189     return -1;
 190 }
 191
 192 int ssl3_dispatch_alert(SSL *s)
 193 {
 194     int i, j;
 195     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 196
 197     s->s3->alert_dispatch = 0;
 198     i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
 199     if (i <= 0) {
 200         s->s3->alert_dispatch = 1;
 201     } else {
 202         /*
 203          * Alert sent to BIO.  If it is important, flush it now. If the
 204          * message does not get sent due to non-blocking IO, we will not
 205          * worry too much.
 206          */
 207         if (s->s3->send_alert[0] == SSL3_AL_FATAL)
 208             (void)BIO_flush(s->wbio);
 209
 210         if (s->msg_callback)
 211             s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
 212                             2, s, s->msg_callback_arg);
 213
 214         if (s->info_callback != NULL)
 215             cb = s->info_callback;
 216         else if (s->ctx->info_callback != NULL)
 217             cb = s->ctx->info_callback;
 218
 219         if (cb != NULL) {
 220             j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1];
 221             cb(s, SSL_CB_WRITE_ALERT, j);
 222         }
 223     }
 224     return (i);
 225 }