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 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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package sun.security.ssl;

import java.io.IOException;
import java.nio.BufferOverflowException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.security.AlgorithmConstraints;
import java.security.CryptoPrimitive;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.ArrayList;
import java.util.Collections;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import javax.crypto.SecretKey;
import javax.net.ssl.SNIServerName;
import javax.net.ssl.SSLHandshakeException;
import javax.security.auth.x500.X500Principal;
import sun.security.ssl.NamedGroup.NamedGroupSpec;
import static sun.security.ssl.NamedGroup.NamedGroupSpec.*;
import sun.security.ssl.SupportedGroupsExtension.SupportedGroups;

abstract class HandshakeContext implements ConnectionContext {
    // System properties

    // By default, disable the unsafe legacy session renegotiation.
    static final boolean allowUnsafeRenegotiation =
            Utilities.getBooleanProperty(
                    "sun.security.ssl.allowUnsafeRenegotiation", false);

    // For maximum interoperability and backward compatibility, RFC 5746
    // allows server (or client) to accept ClientHello (or ServerHello)
    // message without the secure renegotiation_info extension or SCSV.
    //
    // For maximum security, RFC 5746 also allows server (or client) to
    // reject such message with a fatal "handshake_failure" alert.
    //
    // By default, allow such legacy hello messages.
    static final boolean allowLegacyHelloMessages =
            Utilities.getBooleanProperty(
                    "sun.security.ssl.allowLegacyHelloMessages", true);

    // registered handshake message actors
    LinkedHashMap<Byte, SSLConsumer>  handshakeConsumers;
    final HashMap<Byte, HandshakeProducer>  handshakeProducers;

    // context
    final SSLContextImpl                    sslContext;
    final TransportContext                  conContext;
    final SSLConfiguration                  sslConfig;

    // consolidated parameters
    final List<ProtocolVersion>             activeProtocols;
    final List<CipherSuite>                 activeCipherSuites;
    final AlgorithmConstraints              algorithmConstraints;
    final ProtocolVersion                   maximumActiveProtocol;

    // output stream
    final HandshakeOutStream                handshakeOutput;

    // handshake transcript hash
    final HandshakeHash                     handshakeHash;

    // negotiated security parameters
    SSLSessionImpl                          handshakeSession;
    boolean                                 handshakeFinished;
    // boolean                                 isInvalidated;

    boolean                                 kickstartMessageDelivered;

    // Resumption
    boolean                                 isResumption;
    SSLSessionImpl                          resumingSession;
    // Session is using stateless resumption
    boolean                                 statelessResumption = false;

    final Queue<Map.Entry<Byte, ByteBuffer>> delegatedActions;
    volatile boolean                        taskDelegated = false;
    volatile Exception                      delegatedThrown = null;

    ProtocolVersion                         negotiatedProtocol;
    CipherSuite                             negotiatedCipherSuite;
    final List<SSLPossession>               handshakePossessions;
    final List<SSLCredentials>              handshakeCredentials;
    SSLKeyDerivation                        handshakeKeyDerivation;
    SSLKeyExchange                          handshakeKeyExchange;
    SecretKey                               baseReadSecret;
    SecretKey                               baseWriteSecret;

    // protocol version being established
    int                                     clientHelloVersion;
    String                                  applicationProtocol;

    RandomCookie                            clientHelloRandom;
    RandomCookie                            serverHelloRandom;
    byte[]                                  certRequestContext;

    ////////////////////
    // Extensions

    // the extensions used in the handshake
    final Map<SSLExtension, SSLExtension.SSLExtensionSpec>
                                            handshakeExtensions;

    // MaxFragmentLength
    int                                     maxFragmentLength;

    // SignatureScheme
    List<SignatureScheme>                   localSupportedSignAlgs;
    List<SignatureScheme>                   peerRequestedSignatureSchemes;
    List<SignatureScheme>                   peerRequestedCertSignSchemes;

    // Known authorities
    X500Principal[]                         peerSupportedAuthorities = null;

    // SupportedGroups
    List<NamedGroup>                        clientRequestedNamedGroups;

    // HelloRetryRequest
    NamedGroup                              serverSelectedNamedGroup;

    // if server name indicator is negotiated
    //
    // May need a public API for the indication in the future.
    List<SNIServerName>                     requestedServerNames;
    SNIServerName                           negotiatedServerName;

    // OCSP Stapling info
    boolean                                 staplingActive = false;

    protected HandshakeContext(SSLContextImpl sslContext,
            TransportContext conContext) throws IOException {
        this.sslContext = sslContext;
        this.conContext = conContext;
        this.sslConfig = (SSLConfiguration)conContext.sslConfig.clone();

        this.algorithmConstraints = new SSLAlgorithmConstraints(
                sslConfig.userSpecifiedAlgorithmConstraints);
        this.activeProtocols = getActiveProtocols(sslConfig.enabledProtocols,
                sslConfig.enabledCipherSuites, algorithmConstraints);
        if (activeProtocols.isEmpty()) {
            throw new SSLHandshakeException(
                "No appropriate protocol (protocol is disabled or " +
                "cipher suites are inappropriate)");
        }

        ProtocolVersion maximumVersion = ProtocolVersion.NONE;
        for (ProtocolVersion pv : this.activeProtocols) {
            if (maximumVersion == ProtocolVersion.NONE ||
                    pv.compare(maximumVersion) > 0) {
                maximumVersion = pv;
            }
        }
        this.maximumActiveProtocol = maximumVersion;
        this.activeCipherSuites = getActiveCipherSuites(this.activeProtocols,
                sslConfig.enabledCipherSuites, algorithmConstraints);
        if (activeCipherSuites.isEmpty()) {
            throw new SSLHandshakeException("No appropriate cipher suite");
        }

        this.handshakeConsumers = new LinkedHashMap<>();
        this.handshakeProducers = new HashMap<>();
        this.handshakeHash = conContext.inputRecord.handshakeHash;
        this.handshakeOutput = new HandshakeOutStream(conContext.outputRecord);

        this.handshakeFinished = false;
        this.kickstartMessageDelivered = false;

        this.delegatedActions = new LinkedList<>();
        this.handshakeExtensions = new HashMap<>();
        this.handshakePossessions = new LinkedList<>();
        this.handshakeCredentials = new LinkedList<>();
        this.requestedServerNames = null;
        this.negotiatedServerName = null;
        this.negotiatedCipherSuite = conContext.cipherSuite;
        initialize();
    }

    
Constructor for PostHandshakeContext
/** * Constructor for PostHandshakeContext */
protected HandshakeContext(TransportContext conContext) { this.sslContext = conContext.sslContext; this.conContext = conContext; this.sslConfig = conContext.sslConfig; this.negotiatedProtocol = conContext.protocolVersion; this.negotiatedCipherSuite = conContext.cipherSuite; this.handshakeOutput = new HandshakeOutStream(conContext.outputRecord); this.delegatedActions = new LinkedList<>(); this.handshakeConsumers = new LinkedHashMap<>(); this.handshakeProducers = null; this.handshakeHash = null; this.activeProtocols = null; this.activeCipherSuites = null; this.algorithmConstraints = null; this.maximumActiveProtocol = null; this.handshakeExtensions = Collections.emptyMap(); // Not in TLS13 this.handshakePossessions = null; this.handshakeCredentials = null; } // Initialize the non-final class variables. private void initialize() { ProtocolVersion inputHelloVersion; ProtocolVersion outputHelloVersion; if (conContext.isNegotiated) { inputHelloVersion = conContext.protocolVersion; outputHelloVersion = conContext.protocolVersion; } else { if (activeProtocols.contains(ProtocolVersion.SSL20Hello)) { inputHelloVersion = ProtocolVersion.SSL20Hello; // Per TLS 1.3 protocol, implementation MUST NOT send an SSL // version 2.0 compatible CLIENT-HELLO. if (maximumActiveProtocol.useTLS13PlusSpec()) { outputHelloVersion = maximumActiveProtocol; } else { outputHelloVersion = ProtocolVersion.SSL20Hello; } } else { inputHelloVersion = maximumActiveProtocol; outputHelloVersion = maximumActiveProtocol; } } conContext.inputRecord.setHelloVersion(inputHelloVersion); conContext.outputRecord.setHelloVersion(outputHelloVersion); if (!conContext.isNegotiated) { conContext.protocolVersion = maximumActiveProtocol; } conContext.outputRecord.setVersion(conContext.protocolVersion); } private static List<ProtocolVersion> getActiveProtocols( List<ProtocolVersion> enabledProtocols, List<CipherSuite> enabledCipherSuites, AlgorithmConstraints algorithmConstraints) { boolean enabledSSL20Hello = false; ArrayList<ProtocolVersion> protocols = new ArrayList<>(4); for (ProtocolVersion protocol : enabledProtocols) { if (!enabledSSL20Hello && protocol == ProtocolVersion.SSL20Hello) { enabledSSL20Hello = true; continue; } if (!algorithmConstraints.permits( EnumSet.of(CryptoPrimitive.KEY_AGREEMENT), protocol.name, null)) { // Ignore disabled protocol. continue; } boolean found = false; Map<NamedGroupSpec, Boolean> cachedStatus = new EnumMap<>(NamedGroupSpec.class); for (CipherSuite suite : enabledCipherSuites) { if (suite.isAvailable() && suite.supports(protocol)) { if (isActivatable(suite, algorithmConstraints, cachedStatus)) { protocols.add(protocol); found = true; break; } } else if (SSLLogger.isOn && SSLLogger.isOn("verbose")) { SSLLogger.fine( "Ignore unsupported cipher suite: " + suite + " for " + protocol); } } if (!found && (SSLLogger.isOn) && SSLLogger.isOn("handshake")) { SSLLogger.fine( "No available cipher suite for " + protocol); } } if (!protocols.isEmpty()) { if (enabledSSL20Hello) { protocols.add(ProtocolVersion.SSL20Hello); } Collections.sort(protocols); } return Collections.unmodifiableList(protocols); } private static List<CipherSuite> getActiveCipherSuites( List<ProtocolVersion> enabledProtocols, List<CipherSuite> enabledCipherSuites, AlgorithmConstraints algorithmConstraints) { List<CipherSuite> suites = new LinkedList<>(); if (enabledProtocols != null && !enabledProtocols.isEmpty()) { Map<NamedGroupSpec, Boolean> cachedStatus = new EnumMap<>(NamedGroupSpec.class); for (CipherSuite suite : enabledCipherSuites) { if (!suite.isAvailable()) { continue; } boolean isSupported = false; for (ProtocolVersion protocol : enabledProtocols) { if (!suite.supports(protocol)) { continue; } if (isActivatable(suite, algorithmConstraints, cachedStatus)) { suites.add(suite); isSupported = true; break; } } if (!isSupported && SSLLogger.isOn && SSLLogger.isOn("verbose")) { SSLLogger.finest( "Ignore unsupported cipher suite: " + suite); } } } return Collections.unmodifiableList(suites); }
Parse the handshake record and return the contentType
/** * Parse the handshake record and return the contentType */
static byte getHandshakeType(TransportContext conContext, Plaintext plaintext) throws IOException { // struct { // HandshakeType msg_type; /* handshake type */ // uint24 length; /* bytes in message */ // select (HandshakeType) { // ... // } body; // } Handshake; if (plaintext.contentType != ContentType.HANDSHAKE.id) { throw conContext.fatal(Alert.INTERNAL_ERROR, "Unexpected operation for record: " + plaintext.contentType); } if (plaintext.fragment == null || plaintext.fragment.remaining() < 4) { throw conContext.fatal(Alert.UNEXPECTED_MESSAGE, "Invalid handshake message: insufficient data"); } byte handshakeType = (byte)Record.getInt8(plaintext.fragment); int handshakeLen = Record.getInt24(plaintext.fragment); if (handshakeLen != plaintext.fragment.remaining()) { throw conContext.fatal(Alert.UNEXPECTED_MESSAGE, "Invalid handshake message: insufficient handshake body"); } return handshakeType; } void dispatch(byte handshakeType, Plaintext plaintext) throws IOException { if (conContext.transport.useDelegatedTask()) { boolean hasDelegated = !delegatedActions.isEmpty(); if (hasDelegated || (handshakeType != SSLHandshake.FINISHED.id && handshakeType != SSLHandshake.KEY_UPDATE.id && handshakeType != SSLHandshake.NEW_SESSION_TICKET.id)) { if (!hasDelegated) { taskDelegated = false; delegatedThrown = null; } // Clone the fragment for delegated actions. // // The plaintext may share the application buffers. It is // fine to use shared buffers if no delegated actions. // However, for delegated actions, the shared buffers may be // polluted in application layer before the delegated actions // executed. ByteBuffer fragment = ByteBuffer.wrap( new byte[plaintext.fragment.remaining()]); fragment.put(plaintext.fragment); fragment = fragment.rewind(); delegatedActions.add(new SimpleImmutableEntry<>( handshakeType, fragment )); } else { dispatch(handshakeType, plaintext.fragment); } } else { dispatch(handshakeType, plaintext.fragment); } } void dispatch(byte handshakeType, ByteBuffer fragment) throws IOException { SSLConsumer consumer; if (handshakeType == SSLHandshake.HELLO_REQUEST.id) { // For TLS 1.2 and prior versions, the HelloRequest message MAY // be sent by the server at any time. consumer = SSLHandshake.HELLO_REQUEST; } else { consumer = handshakeConsumers.get(handshakeType); } if (consumer == null) { throw conContext.fatal(Alert.UNEXPECTED_MESSAGE, "Unexpected handshake message: " + SSLHandshake.nameOf(handshakeType)); } try { consumer.consume(this, fragment); } catch (UnsupportedOperationException unsoe) { throw conContext.fatal(Alert.UNEXPECTED_MESSAGE, "Unsupported handshake message: " + SSLHandshake.nameOf(handshakeType), unsoe); } catch (BufferUnderflowException | BufferOverflowException be) { throw conContext.fatal(Alert.DECODE_ERROR, "Illegal handshake message: " + SSLHandshake.nameOf(handshakeType), be); } // update handshake hash after handshake message consumption. handshakeHash.consume(); } abstract void kickstart() throws IOException;
Check if the given cipher suite is enabled and available within the current active cipher suites. Does not check if the required server certificates are available.
/** * Check if the given cipher suite is enabled and available within * the current active cipher suites. * * Does not check if the required server certificates are available. */
boolean isNegotiable(CipherSuite cs) { return isNegotiable(activeCipherSuites, cs); }
Check if the given cipher suite is enabled and available within the proposed cipher suite list. Does not check if the required server certificates are available.
/** * Check if the given cipher suite is enabled and available within * the proposed cipher suite list. * * Does not check if the required server certificates are available. */
static final boolean isNegotiable( List<CipherSuite> proposed, CipherSuite cs) { return proposed.contains(cs) && cs.isNegotiable(); }
Check if the given cipher suite is enabled and available within the proposed cipher suite list and specific protocol version. Does not check if the required server certificates are available.
/** * Check if the given cipher suite is enabled and available within * the proposed cipher suite list and specific protocol version. * * Does not check if the required server certificates are available. */
static final boolean isNegotiable(List<CipherSuite> proposed, ProtocolVersion protocolVersion, CipherSuite cs) { return proposed.contains(cs) && cs.isNegotiable() && cs.supports(protocolVersion); }
Check if the given protocol version is enabled and available.
/** * Check if the given protocol version is enabled and available. */
boolean isNegotiable(ProtocolVersion protocolVersion) { return activeProtocols.contains(protocolVersion); }
Set the active protocol version and propagate it to the SSLSocket and our handshake streams. Called from ClientHandshaker and ServerHandshaker with the negotiated protocol version.
/** * Set the active protocol version and propagate it to the SSLSocket * and our handshake streams. Called from ClientHandshaker * and ServerHandshaker with the negotiated protocol version. */
void setVersion(ProtocolVersion protocolVersion) { this.conContext.protocolVersion = protocolVersion; } private static boolean isActivatable(CipherSuite suite, AlgorithmConstraints algorithmConstraints, Map<NamedGroupSpec, Boolean> cachedStatus) { if (algorithmConstraints.permits( EnumSet.of(CryptoPrimitive.KEY_AGREEMENT), suite.name, null)) { if (suite.keyExchange == null) { // TLS 1.3, no definition of key exchange in cipher suite. return true; } // Is at least one of the group types available? boolean groupAvailable, retval = false; NamedGroupSpec[] groupTypes = suite.keyExchange.groupTypes; for (NamedGroupSpec groupType : groupTypes) { if (groupType != NAMED_GROUP_NONE) { Boolean checkedStatus = cachedStatus.get(groupType); if (checkedStatus == null) { groupAvailable = SupportedGroups.isActivatable( algorithmConstraints, groupType); cachedStatus.put(groupType, groupAvailable); if (!groupAvailable && SSLLogger.isOn && SSLLogger.isOn("verbose")) { SSLLogger.fine( "No activated named group in " + groupType); } } else { groupAvailable = checkedStatus; } retval |= groupAvailable; } else { retval |= true; } } if (!retval && SSLLogger.isOn && SSLLogger.isOn("verbose")) { SSLLogger.fine("No active named group(s), ignore " + suite); } return retval; } else if (SSLLogger.isOn && SSLLogger.isOn("verbose")) { SSLLogger.fine("Ignore disabled cipher suite: " + suite); } return false; } List<SNIServerName> getRequestedServerNames() { if (requestedServerNames == null) { return Collections.emptyList(); } return requestedServerNames; } }