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
ssl3_do_change_cipher_spec(SSL * s)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
ssl3_send_alert(SSL * s,int level,int desc)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
ssl3_dispatch_alert(SSL * s)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