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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "ssl_local.h"
int ssl3_do_change_cipher_spec(SSL_CONNECTION *s)
{
int i;
SSL *ssl = SSL_CONNECTION_GET_SSL(s);
if (s->server)
i = SSL3_CHANGE_CIPHER_SERVER_READ;
else
i = SSL3_CHANGE_CIPHER_CLIENT_READ;
if (s->s3.tmp.key_block == NULL) {
if (s->session == NULL || s->session->master_key_length == 0) {
/* might happen if dtls1_read_bytes() calls this */
ERR_raise(ERR_LIB_SSL, SSL_R_CCS_RECEIVED_EARLY);
return 0;
}
s->session->cipher = s->s3.tmp.new_cipher;
if (!ssl->method->ssl3_enc->setup_key_block(s)) {
/* SSLfatal() already called */
return 0;
}
}
if (!ssl->method->ssl3_enc->change_cipher_state(s, i)) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
int ssl3_send_alert(SSL_CONNECTION *s, int level, int desc)
{
SSL *ssl = SSL_CONNECTION_GET_SSL(s);
/* Map tls/ssl alert value to correct one */
if (SSL_CONNECTION_TREAT_AS_TLS13(s))
desc = tls13_alert_code(desc);
else
desc = ssl->method->ssl3_enc->alert_value(desc);
if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
* protocol_version alerts */
if (desc < 0)
return -1;
if (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY)
return -1;
/* If a fatal one, remove from cache */
if ((level == SSL3_AL_FATAL) && (s->session != NULL))
SSL_CTX_remove_session(s->session_ctx, s->session);
s->s3.alert_dispatch = SSL_ALERT_DISPATCH_PENDING;
s->s3.send_alert[0] = level;
s->s3.send_alert[1] = desc;
if (!RECORD_LAYER_write_pending(&s->rlayer)) {
/* data still being written out? */
return ssl->method->ssl_dispatch_alert(ssl);
}
/*
* else data is still being written out, we will get written some time in
* the future
*/
return -1;
}
int ssl3_dispatch_alert(SSL *s)
{
int i, j;
void (*cb) (const SSL *ssl, int type, int val) = NULL;
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
OSSL_RECORD_TEMPLATE templ;
if (sc == NULL)
return -1;
if (sc->rlayer.wrlmethod == NULL) {
/* No write record layer so we can't sent and alert. We just ignore it */
sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
return 1;
}
templ.type = SSL3_RT_ALERT;
templ.version = (sc->version == TLS1_3_VERSION) ? TLS1_2_VERSION
: sc->version;
if (SSL_get_state(s) == TLS_ST_CW_CLNT_HELLO
&& !sc->renegotiate
&& TLS1_get_version(s) > TLS1_VERSION
&& sc->hello_retry_request == SSL_HRR_NONE) {
templ.version = TLS1_VERSION;
}
templ.buf = &sc->s3.send_alert[0];
templ.buflen = 2;
if (RECORD_LAYER_write_pending(&sc->rlayer)) {
if (sc->s3.alert_dispatch != SSL_ALERT_DISPATCH_RETRY) {
/*
* We have a write pending but it wasn't from a previous call to
* this function! Can we ever get here? Maybe via API misuse??
* Give up.
*/
sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
return -1;
}
/* Retry what we've already got pending */
i = HANDLE_RLAYER_WRITE_RETURN(sc,
sc->rlayer.wrlmethod->retry_write_records(sc->rlayer.wrl));
if (i <= 0) {
/* Could be NBIO. Keep alert_dispatch as SSL_ALERT_DISPATCH_RETRY */
return -1;
}
sc->rlayer.wpend_tot = 0;
sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
return 1;
}
i = HANDLE_RLAYER_WRITE_RETURN(sc,
sc->rlayer.wrlmethod->write_records(sc->rlayer.wrl, &templ, 1));
if (i <= 0) {
sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_RETRY;
sc->rlayer.wpend_tot = templ.buflen;
sc->rlayer.wpend_type = templ.type;
sc->rlayer.wpend_buf = templ.buf;
} else {
/*
* Alert sent to BIO - now flush. If the message does not get sent due
* to non-blocking IO, we will not worry too much.
*/
(void)BIO_flush(sc->wbio);
sc->s3.alert_dispatch = SSL_ALERT_DISPATCH_NONE;
if (sc->msg_callback)
sc->msg_callback(1, sc->version, SSL3_RT_ALERT, sc->s3.send_alert,
2, s, sc->msg_callback_arg);
if (sc->info_callback != NULL)
cb = sc->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
if (cb != NULL) {
j = (sc->s3.send_alert[0] << 8) | sc->s3.send_alert[1];
cb(s, SSL_CB_WRITE_ALERT, j);
}
}
return i;
}
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