| /* |
| * Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.ssl; |
| |
| import java.io.IOException; |
| import java.security.cert.X509Certificate; |
| |
| import sun.security.ssl.ClientHello.ClientHelloMessage; |
| |
| class ClientHandshakeContext extends HandshakeContext { |
| /* |
| * Allow unsafe server certificate change? |
| * |
| * Server certificate change during SSL/TLS renegotiation may be considered |
| * unsafe, as described in the Triple Handshake attacks: |
| * |
| * https://secure-resumption.com/tlsauth.pdf |
| * |
| * Endpoint identification (See |
| * SSLParameters.getEndpointIdentificationAlgorithm()) is a pretty nice |
| * guarantee that the server certificate change in renegotiation is legal. |
| * However, endpoint identification is only enabled for HTTPS and LDAP |
| * over SSL/TLS by default. It is not enough to protect SSL/TLS |
| * connections other than HTTPS and LDAP. |
| * |
| * The renegotiation indication extension (See RFC 5746) is a pretty |
| * strong guarantee that the endpoints on both client and server sides |
| * are identical on the same connection. However, the Triple Handshake |
| * attacks can bypass this guarantee if there is a session-resumption |
| * handshake between the initial full handshake and the renegotiation |
| * full handshake. |
| * |
| * Server certificate change may be unsafe and should be restricted if |
| * endpoint identification is not enabled and the previous handshake is |
| * a session-resumption abbreviated initial handshake, unless the |
| * identities represented by both certificates can be regraded as the |
| * same (See isIdentityEquivalent()). |
| * |
| * Considering the compatibility impact and the actual requirements to |
| * support server certificate change in practice, the system property, |
| * jdk.tls.allowUnsafeServerCertChange, is used to define whether unsafe |
| * server certificate change in renegotiation is allowed or not. The |
| * default value of the system property is "false". To mitigate the |
| * compatibility impact, applications may want to set the system |
| * property to "true" at their own risk. |
| * |
| * If the value of the system property is "false", server certificate |
| * change in renegotiation after a session-resumption abbreviated initial |
| * handshake is restricted (See isIdentityEquivalent()). |
| * |
| * If the system property is set to "true" explicitly, the restriction on |
| * server certificate change in renegotiation is disabled. |
| */ |
| static final boolean allowUnsafeServerCertChange = |
| Utilities.getBooleanProperty( |
| "jdk.tls.allowUnsafeServerCertChange", false); |
| |
| /* |
| * the reserved server certificate chain in previous handshaking |
| * |
| * The server certificate chain is only reserved if the previous |
| * handshake is a session-resumption abbreviated initial handshake. |
| */ |
| X509Certificate[] reservedServerCerts = null; |
| |
| X509Certificate[] deferredCerts; |
| |
| ClientHelloMessage initialClientHelloMsg = null; |
| |
| // Flag to indicate receipt of a CertificateRequest message from |
| // the server. Because this is optional, we cannot guarantee |
| // the handshakeConsumers Map will always have it present there. |
| boolean receivedCertReq = false; |
| |
| // PSK identity is selected in first Hello and used again after HRR |
| byte[] pskIdentity; |
| |
| ClientHandshakeContext(SSLContextImpl sslContext, |
| TransportContext conContext) throws IOException { |
| super(sslContext, conContext); |
| } |
| |
| @Override |
| void kickstart() throws IOException { |
| if (kickstartMessageDelivered) { |
| return; |
| } |
| |
| SSLHandshake.kickstart(this); |
| kickstartMessageDelivered = true; |
| } |
| } |