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