ssl/s3_msg.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "ssl_local.h"
  11
  12 int ssl3_do_change_cipher_spec(SSL *s)
  13 {
  14     int i;
  15
  16     if (s->server)
  17         i = SSL3_CHANGE_CIPHER_SERVER_READ;
  18     else
  19         i = SSL3_CHANGE_CIPHER_CLIENT_READ;
  20
  21     if (s->s3.tmp.key_block == NULL) {
  22         if (s->session == NULL || s->session->master_key_length == 0) {
  23             /* might happen if dtls1_read_bytes() calls this */
  24             SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY);
  25             return 0;
  26         }
  27
  28         s->session->cipher = s->s3.tmp.new_cipher;
  29         if (!s->method->ssl3_enc->setup_key_block(s)) {
  30             /* SSLfatal() already called */
  31             return 0;
  32         }
  33     }
  34
  35     if (!s->method->ssl3_enc->change_cipher_state(s, i)) {
  36         /* SSLfatal() already called */
  37         return 0;
  38     }
  39
  40     return 1;
  41 }
  42
  43 int ssl3_send_alert(SSL *s, int level, int desc)
  44 {
  45     /* Map tls/ssl alert value to correct one */
  46     if (SSL_TREAT_AS_TLS13(s))
  47         desc = tls13_alert_code(desc);
  48     else
  49         desc = s->method->ssl3_enc->alert_value(desc);
  50     if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
  51         desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
  52                                           * protocol_version alerts */
  53     if (desc < 0)
  54         return -1;
  55     /* If a fatal one, remove from cache */
  56     if ((level == SSL3_AL_FATAL) && (s->session != NULL))
  57         SSL_CTX_remove_session(s->session_ctx, s->session);
  58
  59     s->s3.alert_dispatch = 1;
  60     s->s3.send_alert[0] = level;
  61     s->s3.send_alert[1] = desc;
  62     if (!RECORD_LAYER_write_pending(&s->rlayer)) {
  63         /* data still being written out? */
  64         return s->method->ssl_dispatch_alert(s);
  65     }
  66     /*
  67      * else data is still being written out, we will get written some time in
  68      * the future
  69      */
  70     return -1;
  71 }
  72
  73 int ssl3_dispatch_alert(SSL *s)
  74 {
  75     int i, j;
  76     size_t alertlen;
  77     void (*cb) (const SSL *ssl, int type, int val) = NULL;
  78     size_t written;
  79
  80     s->s3.alert_dispatch = 0;
  81     alertlen = 2;
  82     i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3.send_alert[0], &alertlen, 1, 0,
  83                       &written);
  84     if (i <= 0) {
  85         s->s3.alert_dispatch = 1;
  86     } else {
  87         /*
  88          * Alert sent to BIO - now flush. If the message does not get sent due
  89          * to non-blocking IO, we will not worry too much.
  90          */
  91         (void)BIO_flush(s->wbio);
  92
  93         if (s->msg_callback)
  94             s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3.send_alert,
  95                             2, s, s->msg_callback_arg);
  96
  97         if (s->info_callback != NULL)
  98             cb = s->info_callback;
  99         else if (s->ctx->info_callback != NULL)
 100             cb = s->ctx->info_callback;
 101
 102         if (cb != NULL) {
 103             j = (s->s3.send_alert[0] << 8) | s->s3.send_alert[1];
 104             cb(s, SSL_CB_WRITE_ALERT, j);
 105         }
 106     }
 107     return i;
 108 }