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      1 /*
      2  * Copyright 1995-2021 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             ERR_raise(ERR_LIB_SSL, 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 (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY)
     56         return -1;
     57     /* If a fatal one, remove from cache */
     58     if ((level == SSL3_AL_FATAL) && (s->session != NULL))
     59         SSL_CTX_remove_session(s->session_ctx, s->session);
     60 
     61     s->s3.alert_dispatch = 1;
     62     s->s3.send_alert[0] = level;
     63     s->s3.send_alert[1] = desc;
     64     if (!RECORD_LAYER_write_pending(&s->rlayer)) {
     65         /* data still being written out? */
     66         return s->method->ssl_dispatch_alert(s);
     67     }
     68     /*
     69      * else data is still being written out, we will get written some time in
     70      * the future
     71      */
     72     return -1;
     73 }
     74 
     75 int ssl3_dispatch_alert(SSL *s)
     76 {
     77     int i, j;
     78     size_t alertlen;
     79     void (*cb) (const SSL *ssl, int type, int val) = NULL;
     80     size_t written;
     81 
     82     s->s3.alert_dispatch = 0;
     83     alertlen = 2;
     84     i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3.send_alert[0], &alertlen, 1, 0,
     85                       &written);
     86     if (i <= 0) {
     87         s->s3.alert_dispatch = 1;
     88     } else {
     89         /*
     90          * Alert sent to BIO - now flush. If the message does not get sent due
     91          * to non-blocking IO, we will not worry too much.
     92          */
     93         (void)BIO_flush(s->wbio);
     94 
     95         if (s->msg_callback)
     96             s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3.send_alert,
     97                             2, s, s->msg_callback_arg);
     98 
     99         if (s->info_callback != NULL)
    100             cb = s->info_callback;
    101         else if (s->ctx->info_callback != NULL)
    102             cb = s->ctx->info_callback;
    103 
    104         if (cb != NULL) {
    105             j = (s->s3.send_alert[0] << 8) | s->s3.send_alert[1];
    106             cb(s, SSL_CB_WRITE_ALERT, j);
    107         }
    108     }
    109     return i;
    110 }
    111