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_CONNECTION * s)12 int ssl3_do_change_cipher_spec(SSL_CONNECTION *s)
13 {
14 int i;
15 SSL *ssl = SSL_CONNECTION_GET_SSL(s);
16
17 if (s->server)
18 i = SSL3_CHANGE_CIPHER_SERVER_READ;
19 else
20 i = SSL3_CHANGE_CIPHER_CLIENT_READ;
21
22 if (s->s3.tmp.key_block == NULL) {
23 if (s->session == NULL || s->session->master_key_length == 0) {
24 /* might happen if dtls1_read_bytes() calls this */
25 ERR_raise(ERR_LIB_SSL, SSL_R_CCS_RECEIVED_EARLY);
26 return 0;
27 }
28
29 s->session->cipher = s->s3.tmp.new_cipher;
30 if (!ssl->method->ssl3_enc->setup_key_block(s)) {
31 /* SSLfatal() already called */
32 return 0;
33 }
34 }
35
36 if (!ssl->method->ssl3_enc->change_cipher_state(s, i)) {
37 /* SSLfatal() already called */
38 return 0;
39 }
40
41 return 1;
42 }
43
ssl3_send_alert(SSL_CONNECTION * s,int level,int desc)44 int ssl3_send_alert(SSL_CONNECTION *s, int level, int desc)
45 {
46 SSL *ssl = SSL_CONNECTION_GET_SSL(s);
47
48 /* Map tls/ssl alert value to correct one */
49 if (SSL_CONNECTION_TREAT_AS_TLS13(s))
50 desc = tls13_alert_code(desc);
51 else
52 desc = ssl->method->ssl3_enc->alert_value(desc);
53 if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
54 desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
55 * protocol_version alerts */
56 if (desc < 0)
57 return -1;
58 if (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY)
59 return -1;
60 /* If a fatal one, remove from cache */
61 if ((level == SSL3_AL_FATAL) && (s->session != NULL))
62 SSL_CTX_remove_session(s->session_ctx, s->session);
63
64 s->s3.alert_dispatch = SSL_ALERT_DISPATCH_PENDING;
65 s->s3.send_alert[0] = level;
66 s->s3.send_alert[1] = desc;
67 if (!RECORD_LAYER_write_pending(&s->rlayer)) {
68 /* data still being written out? */
69 return ssl->method->ssl_dispatch_alert(ssl);
70 }
71 /*
72 * else data is still being written out, we will get written some time in
73 * the future
74 */
75 return -1;
76 }
77
ssl3_dispatch_alert(SSL * s)78 int ssl3_dispatch_alert(SSL *s)
79 {
80 int i, j;
81 void (*cb) (const SSL *ssl, int type, int val) = NULL;
82 SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
83 OSSL_RECORD_TEMPLATE templ;
84
85 if (sc == NULL)
86 return -1;
87
88 if (sc->rlayer.wrlmethod == NULL) {
89 /* No write record layer so we can't sent and alert. We just ignore it */
90 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
91 return 1;
92 }
93
94 templ.type = SSL3_RT_ALERT;
95 templ.version = (sc->version == TLS1_3_VERSION) ? TLS1_2_VERSION
96 : sc->version;
97 if (SSL_get_state(s) == TLS_ST_CW_CLNT_HELLO
98 && !sc->renegotiate
99 && TLS1_get_version(s) > TLS1_VERSION
100 && sc->hello_retry_request == SSL_HRR_NONE) {
101 templ.version = TLS1_VERSION;
102 }
103 templ.buf = &sc->s3.send_alert[0];
104 templ.buflen = 2;
105
106 if (RECORD_LAYER_write_pending(&sc->rlayer)) {
107 if (sc->s3.alert_dispatch != SSL_ALERT_DISPATCH_RETRY) {
108 /*
109 * We have a write pending but it wasn't from a previous call to
110 * this function! Can we ever get here? Maybe via API misuse??
111 * Give up.
112 */
113 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
114 return -1;
115 }
116 /* Retry what we've already got pending */
117 i = HANDLE_RLAYER_WRITE_RETURN(sc,
118 sc->rlayer.wrlmethod->retry_write_records(sc->rlayer.wrl));
119 if (i <= 0) {
120 /* Could be NBIO. Keep alert_dispatch as SSL_ALERT_DISPATCH_RETRY */
121 return -1;
122 }
123 sc->rlayer.wpend_tot = 0;
124 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
125 return 1;
126 }
127
128 i = HANDLE_RLAYER_WRITE_RETURN(sc,
129 sc->rlayer.wrlmethod->write_records(sc->rlayer.wrl, &templ, 1));
130
131 if (i <= 0) {
132 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_RETRY;
133 sc->rlayer.wpend_tot = templ.buflen;
134 sc->rlayer.wpend_type = templ.type;
135 sc->rlayer.wpend_buf = templ.buf;
136 } else {
137 /*
138 * Alert sent to BIO - now flush. If the message does not get sent due
139 * to non-blocking IO, we will not worry too much.
140 */
141 (void)BIO_flush(sc->wbio);
142 sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
143
144 if (sc->msg_callback)
145 sc->msg_callback(1, sc->version, SSL3_RT_ALERT, sc->s3.send_alert,
146 2, s, sc->msg_callback_arg);
147
148 if (sc->info_callback != NULL)
149 cb = sc->info_callback;
150 else if (s->ctx->info_callback != NULL)
151 cb = s->ctx->info_callback;
152
153 if (cb != NULL) {
154 j = (sc->s3.send_alert[0] << 8) | sc->s3.send_alert[1];
155 cb(s, SSL_CB_WRITE_ALERT, j);
156 }
157 }
158 return i;
159 }
160
