org.openeuler.sun.security.ssl.ClientHandshakeContext Maven / Gradle / Ivy
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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* 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).
*
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package org.openeuler.sun.security.ssl;
import java.io.IOException;
import java.security.cert.X509Certificate;
import org.openeuler.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;
// 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;
}
}
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