1/*
2 * Copyright 1995-2018 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
12int 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
39int 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 a fatal one, remove from cache */
52    if ((level == SSL3_AL_FATAL) && (s->session != NULL))
53        SSL_CTX_remove_session(s->session_ctx, s->session);
54
55    s->s3->alert_dispatch = 1;
56    s->s3->send_alert[0] = level;
57    s->s3->send_alert[1] = desc;
58    if (!RECORD_LAYER_write_pending(&s->rlayer)) {
59        /* data still being written out? */
60        return s->method->ssl_dispatch_alert(s);
61    }
62    /*
63     * else data is still being written out, we will get written some time in
64     * the future
65     */
66    return -1;
67}
68
69int ssl3_dispatch_alert(SSL *s)
70{
71    int i, j;
72    size_t alertlen;
73    void (*cb) (const SSL *ssl, int type, int val) = NULL;
74    size_t written;
75
76    s->s3->alert_dispatch = 0;
77    alertlen = 2;
78    i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], &alertlen, 1, 0,
79                      &written);
80    if (i <= 0) {
81        s->s3->alert_dispatch = 1;
82    } else {
83        /*
84         * Alert sent to BIO - now flush. If the message does not get sent due
85         * to non-blocking IO, we will not worry too much.
86         */
87        (void)BIO_flush(s->wbio);
88
89        if (s->msg_callback)
90            s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
91                            2, s, s->msg_callback_arg);
92
93        if (s->info_callback != NULL)
94            cb = s->info_callback;
95        else if (s->ctx->info_callback != NULL)
96            cb = s->ctx->info_callback;
97
98        if (cb != NULL) {
99            j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1];
100            cb(s, SSL_CB_WRITE_ALERT, j);
101        }
102    }
103    return i;
104}
105