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      1 /*
      2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the OpenSSL license (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             return 0;
     31     }
     32 
     33     if (!s->method->ssl3_enc->change_cipher_state(s, i))
     34         return 0;
     35 
     36     return 1;
     37 }
     38 
     39 int ssl3_send_alert(SSL *s, int level, int desc)
     40 {
     41     /* Map tls/ssl alert value to correct one */
     42     if (SSL_TREAT_AS_TLS13(s))
     43         desc = tls13_alert_code(desc);
     44     else
     45         desc = s->method->ssl3_enc->alert_value(desc);
     46     if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
     47         desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
     48                                           * protocol_version alerts */
     49     if (desc < 0)
     50         return -1;
     51     if (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY)
     52         return -1;
     53     /* If a fatal one, remove from cache */
     54     if ((level == SSL3_AL_FATAL) && (s->session != NULL))
     55         SSL_CTX_remove_session(s->session_ctx, s->session);
     56 
     57     s->s3->alert_dispatch = 1;
     58     s->s3->send_alert[0] = level;
     59     s->s3->send_alert[1] = desc;
     60     if (!RECORD_LAYER_write_pending(&s->rlayer)) {
     61         /* data still being written out? */
     62         return s->method->ssl_dispatch_alert(s);
     63     }
     64     /*
     65      * else data is still being written out, we will get written some time in
     66      * the future
     67      */
     68     return -1;
     69 }
     70 
     71 int ssl3_dispatch_alert(SSL *s)
     72 {
     73     int i, j;
     74     size_t alertlen;
     75     void (*cb) (const SSL *ssl, int type, int val) = NULL;
     76     size_t written;
     77 
     78     s->s3->alert_dispatch = 0;
     79     alertlen = 2;
     80     i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], &alertlen, 1, 0,
     81                       &written);
     82     if (i <= 0) {
     83         s->s3->alert_dispatch = 1;
     84     } else {
     85         /*
     86          * Alert sent to BIO - now flush. If the message does not get sent due
     87          * to non-blocking IO, we will not worry too much.
     88          */
     89         (void)BIO_flush(s->wbio);
     90 
     91         if (s->msg_callback)
     92             s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
     93                             2, s, s->msg_callback_arg);
     94 
     95         if (s->info_callback != NULL)
     96             cb = s->info_callback;
     97         else if (s->ctx->info_callback != NULL)
     98             cb = s->ctx->info_callback;
     99 
    100         if (cb != NULL) {
    101             j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1];
    102             cb(s, SSL_CB_WRITE_ALERT, j);
    103         }
    104     }
    105     return i;
    106 }
    107