Class SSLParameters


public class SSLParameters
extends Object

Encapsulates parameters for an SSL/TLS connection. The parameters are the list of ciphersuites to be accepted in an SSL/TLS handshake, the list of protocols to be allowed, the endpoint identification algorithm during SSL/TLS handshaking, the Server Name Indication (SNI), the algorithm constraints and whether SSL/TLS servers should request or require client authentication, etc.

SSLParameters can be created via the constructors in this class. Objects can also be obtained using the getSSLParameters() methods in SSLSocket and SSLServerSocket and SSLEngine or the getDefaultSSLParameters() and getSupportedSSLParameters() methods in SSLContext.

SSLParameters can be applied to a connection via the methods SSLSocket.setSSLParameters() and SSLServerSocket.setSSLParameters() and SSLEngine.setSSLParameters().

For example: 

SSLParameters p = sslSocket.getSSLParameters();
p.setProtocols(new String[] { "TLSv1.2" });
p.setCipherSuites(
    new String[] { "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", ... });
p.setApplicationProtocols(new String[] {"h2", "http/1.1"});
sslSocket.setSSLParameters(p);
*
Since:
1.6
See Also:
SSLSocket, SSLEngine, SSLContext

Constructors

Constructor and Description
SSLParameters()

Constructs SSLParameters.
SSLParameters(String[] cipherSuites)

Constructs SSLParameters from the specified array of ciphersuites.
SSLParameters(String[] cipherSuites, String[] protocols)

Constructs SSLParameters from the specified array of ciphersuites and protocols.

Methods

Modifier and Type Method and Description
AlgorithmConstraints getAlgorithmConstraints()

Returns the cryptographic algorithm constraints.
String[] getApplicationProtocols()

Returns a prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.
String[] getCipherSuites()

Returns a copy of the array of ciphersuites or null if none have been set.
String getEndpointIdentificationAlgorithm()

Gets the endpoint identification algorithm.
boolean getNeedClientAuth()

Returns whether client authentication should be required.
String[] getProtocols()

Returns a copy of the array of protocols or null if none have been set.
List<SNIServerName> getServerNames()

Returns a List containing all SNIServerNames of the Server Name Indication (SNI) parameter, or null if none has been set.
Collection<SNIMatcher> getSNIMatchers()

Returns a Collection containing all SNIMatchers of the Server Name Indication (SNI) parameter, or null if none has been set.
boolean getUseCipherSuitesOrder()

Returns whether the local cipher suites preference should be honored.
boolean getWantClientAuth()

Returns whether client authentication should be requested.
void setAlgorithmConstraints(AlgorithmConstraints constraints)

Sets the cryptographic algorithm constraints, which will be used in addition to any configured by the runtime environment.
void setApplicationProtocols(String[] protocols)

Sets the prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.
void setCipherSuites(String[] cipherSuites)

Sets the array of ciphersuites.
void setEndpointIdentificationAlgorithm(String algorithm)

Sets the endpoint identification algorithm.
void setNeedClientAuth(boolean needClientAuth)

Sets whether client authentication should be required.
void setProtocols(String[] protocols)

Sets the array of protocols.
void setServerNames(List<SNIServerName> serverNames)

Sets the desired SNIServerNames of the Server Name Indication (SNI) parameter.
void setSNIMatchers(Collection<SNIMatcher> matchers)

Sets the SNIMatchers of the Server Name Indication (SNI) parameter.
void setUseCipherSuitesOrder(boolean honorOrder)

Sets whether the local cipher suites preference should be honored.
void setWantClientAuth(boolean wantClientAuth)

Sets whether client authentication should be requested.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

SSLParameters

public SSLParameters()

Constructs SSLParameters.

The values of cipherSuites, protocols, cryptographic algorithm constraints, endpoint identification algorithm, server names and server name matchers are set to null, useCipherSuitesOrder, wantClientAuth and needClientAuth are set to false.

SSLParameters

public SSLParameters(String[] cipherSuites)

Constructs SSLParameters from the specified array of ciphersuites.

Calling this constructor is equivalent to calling the no-args constructor followed by setCipherSuites(cipherSuites);.

Parameters:
cipherSuites - the array of ciphersuites (or null)

SSLParameters

public SSLParameters(String[] cipherSuites,
                     String[] protocols)

Constructs SSLParameters from the specified array of ciphersuites and protocols.

Calling this constructor is equivalent to calling the no-args constructor followed by setCipherSuites(cipherSuites); setProtocols(protocols);.

Parameters:
cipherSuites - the array of ciphersuites (or null)
protocols - the array of protocols (or null)

Methods

getCipherSuites

public String[] getCipherSuites()

Returns a copy of the array of ciphersuites or null if none have been set.

Returns:
a copy of the array of ciphersuites or null if none have been set.

setCipherSuites

public void setCipherSuites(String[] cipherSuites)

Sets the array of ciphersuites.

Parameters:
cipherSuites - the array of ciphersuites (or null)

getProtocols

public String[] getProtocols()

Returns a copy of the array of protocols or null if none have been set.

Returns:
a copy of the array of protocols or null if none have been set.

setProtocols

public void setProtocols(String[] protocols)

Sets the array of protocols.

Parameters:
protocols - the array of protocols (or null)

getWantClientAuth

public boolean getWantClientAuth()

Returns whether client authentication should be requested.

Returns:
whether client authentication should be requested.

setWantClientAuth

public void setWantClientAuth(boolean wantClientAuth)

Sets whether client authentication should be requested. Calling this method clears the needClientAuth flag.

Parameters:
wantClientAuth - whether client authentication should be requested

getNeedClientAuth

public boolean getNeedClientAuth()

Returns whether client authentication should be required.

Returns:
whether client authentication should be required.

setNeedClientAuth

public void setNeedClientAuth(boolean needClientAuth)

Sets whether client authentication should be required. Calling this method clears the wantClientAuth flag.

Parameters:
needClientAuth - whether client authentication should be required

getAlgorithmConstraints

public AlgorithmConstraints getAlgorithmConstraints()

Returns the cryptographic algorithm constraints.

Returns:
the cryptographic algorithm constraints, or null if the constraints have not been set
Since:
1.7
See Also:
setAlgorithmConstraints(AlgorithmConstraints)

setAlgorithmConstraints

public void setAlgorithmConstraints(AlgorithmConstraints constraints)

Sets the cryptographic algorithm constraints, which will be used in addition to any configured by the runtime environment.

If the constraints parameter is non-null, every cryptographic algorithm, key and algorithm parameters used in the SSL/TLS handshake must be permitted by the constraints.

Parameters:
constraints - the algorithm constraints (or null)
Since:
1.7

getEndpointIdentificationAlgorithm

public String getEndpointIdentificationAlgorithm()

Gets the endpoint identification algorithm.

Returns:
the endpoint identification algorithm, or null if none has been set.
Since:
1.7
See Also:
X509ExtendedTrustManager, setEndpointIdentificationAlgorithm(String)

setEndpointIdentificationAlgorithm

public void setEndpointIdentificationAlgorithm(String algorithm)

Sets the endpoint identification algorithm.

If the algorithm parameter is non-null or non-empty, the endpoint identification/verification procedures must be handled during SSL/TLS handshaking. This is to prevent man-in-the-middle attacks.

Parameters:
algorithm - The standard string name of the endpoint identification algorithm (or null). See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard algorithm names.
Since:
1.7
See Also:
X509ExtendedTrustManager

setServerNames

public final void setServerNames(List<SNIServerName> serverNames)

Sets the desired SNIServerNames of the Server Name Indication (SNI) parameter.

This method is only useful to SSLSockets or SSLEngines operating in client mode.

Note that the serverNames list is cloned to protect against subsequent modification.

Parameters:
serverNames - the list of desired SNIServerNames (or null)
Throws:
NullPointerException - if the serverNames contains null element
IllegalArgumentException - if the serverNames contains more than one name of the same name type
Since:
1.8
See Also:
SNIServerName, getServerNames()

getServerNames

public final List<SNIServerName> getServerNames()

Returns a List containing all SNIServerNames of the Server Name Indication (SNI) parameter, or null if none has been set.

This method is only useful to SSLSockets or SSLEngines operating in client mode.

For SSL/TLS connections, the underlying SSL/TLS provider may specify a default value for a certain server name type. In client mode, it is recommended that, by default, providers should include the server name indication whenever the server can be located by a supported server name type.

It is recommended that providers initialize default Server Name Indications when creating SSLSocket/SSLEngines. In the following examples, the server name could be represented by an instance of SNIHostName which has been initialized with the hostname "www.example.com" and type StandardConstants.SNI_HOST_NAME. 

Socket socket =
         sslSocketFactory.createSocket("www.example.com", 443);
or 
SSLEngine engine =
         sslContext.createSSLEngine("www.example.com", 443);
Returns:
null or an immutable list of non-null SNIServerNames
Since:
1.8
See Also:
List, setServerNames(List)

setSNIMatchers

public final void setSNIMatchers(Collection<SNIMatcher> matchers)

Sets the SNIMatchers of the Server Name Indication (SNI) parameter.

This method is only useful to SSLSockets or SSLEngines operating in server mode.

Note that the matchers collection is cloned to protect against subsequent modification.

Parameters:
matchers - the collection of SNIMatchers (or null)
Throws:
NullPointerException - if the matchers contains null element
IllegalArgumentException - if the matchers contains more than one name of the same name type
Since:
1.8
See Also:
Collection, SNIMatcher, getSNIMatchers()

getSNIMatchers

public final Collection<SNIMatcher> getSNIMatchers()

Returns a Collection containing all SNIMatchers of the Server Name Indication (SNI) parameter, or null if none has been set.

This method is only useful to SSLSockets or SSLEngines operating in server mode.

For better interoperability, providers generally will not define default matchers so that by default servers will ignore the SNI extension and continue the handshake.

Returns:
null or an immutable collection of non-null SNIMatchers
Since:
1.8
See Also:
SNIMatcher, setSNIMatchers(Collection)

setUseCipherSuitesOrder

public final void setUseCipherSuitesOrder(boolean honorOrder)

Sets whether the local cipher suites preference should be honored.

Parameters:
honorOrder - whether local cipher suites order in #getCipherSuites should be honored during SSL/TLS handshaking.
Since:
1.8
See Also:
getUseCipherSuitesOrder()

getUseCipherSuitesOrder

public final boolean getUseCipherSuitesOrder()

Returns whether the local cipher suites preference should be honored.

Returns:
whether local cipher suites order in #getCipherSuites should be honored during SSL/TLS handshaking.
Since:
1.8
See Also:
setUseCipherSuitesOrder(boolean)

getApplicationProtocols

public String[] getApplicationProtocols()

Returns a prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.

The array could be empty (zero-length), in which case protocol indications will not be used.

This method will return a new array each time it is invoked.

Returns:
a non-null, possibly zero-length array of application protocol Strings. The array is ordered based on protocol preference, with protocols[0] being the most preferred.
Since:
8
See Also:
setApplicationProtocols(java.lang.String[])

setApplicationProtocols

public void setApplicationProtocols(String[] protocols)

Sets the prioritized array of application-layer protocol names that can be negotiated over the SSL/TLS/DTLS protocols.

If application-layer protocols are supported by the underlying SSL/TLS implementation, this method configures which values can be negotiated by protocols such as RFC 7301 , the Application Layer Protocol Negotiation (ALPN).

If this end of the connection is expected to offer application protocol values, all protocols configured by this method will be sent to the peer.

If this end of the connection is expected to select the application protocol value, the protocols configured by this method are compared with those sent by the peer. The first matched value becomes the negotiated value. If none of the protocols were actually requested by the peer, the underlying protocol will determine what action to take. (For example, ALPN will send a "no_application_protocol" alert and terminate the connection.)

Implementation Requirements:
This method will make a copy of the protocols array.
Parameters:
protocols - an ordered array of application protocols, with protocols[0] being the most preferred. If the array is empty (zero-length), protocol indications will not be used.
Throws:
IllegalArgumentException - if protocols is null, or if any element in a non-empty array is null or an empty (zero-length) string
Since:
8
See Also:
getApplicationProtocols()

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