javax.net.ssl

Class SSLServerSocket

java.lang.Object

java.net.ServerSocket

javax.net.ssl.SSLServerSocket

All Implemented Interfaces:

Closeable, AutoCloseable

public abstract class SSLServerSocket
extends ServerSocket

This class extends ServerSockets and provides secure server sockets using protocols such as the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocols.

Instances of this class are generally created using a SSLServerSocketFactory. The primary function of SSLServerSockets is to create SSLSockets by accepting connections.

SSLServerSockets contain several pieces of state data which are inherited by the SSLSocket at socket creation. These include the enabled cipher suites and protocols, whether client authentication is necessary, and whether created sockets should begin handshaking in client or server mode. The state inherited by the created SSLSocket can be overriden by calling the appropriate methods.

Since:

1.4

Author:

David Brownell

See Also:

ServerSocket, SSLSocket

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SSLServerSocket() Used only by subclasses.
protected	SSLServerSocket(int port) Used only by subclasses.
protected	SSLServerSocket(int port, int backlog) Used only by subclasses.
protected	SSLServerSocket(int port, int backlog, InetAddress address) Used only by subclasses.

Method Summary

Modifier and Type	Method and Description
abstract boolean	getNeedClientAuth() Returns true if client authentication will be required on newly accepted server-mode SSLSockets.
abstract boolean	getUseClientMode() Returns true if accepted connections will be in SSL client mode.
abstract void	setNeedClientAuth(boolean need) Controls whether accepted server-mode SSLSockets will be initially configured to require client authentication.
abstract void	setUseClientMode(boolean mode) Controls whether accepted connections are in the (default) SSL server mode, or the SSL client mode.

Methods inherited from class java.net.ServerSocket

accept, bind, bind, close, getInetAddress, getLocalPort, getLocalSocketAddress, getReceiveBufferSize, getReuseAddress, getSoTimeout, isBound, isClosed, setReceiveBufferSize, setReuseAddress, setSoTimeout, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SSLServerSocket

protected SSLServerSocket()
                   throws IOException

Used only by subclasses.

Create an unbound TCP server socket using the default authentication context.

Throws:

IOException - if an I/O error occurs when creating the socket

SSLServerSocket

protected SSLServerSocket(int port)
                   throws IOException

Used only by subclasses.

Create a TCP server socket on a port, using the default authentication context. The connection backlog defaults to fifty connections queued up before the system starts to reject new connection requests.

A port number of 0 creates a socket on any free port.

If there is a security manager, its checkListen method is called with the port argument as its argument to ensure the operation is allowed. This could result in a SecurityException.

Parameters:

port - the port on which to listen

Throws:

IOException - if an I/O error occurs when creating the socket

SecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

IllegalArgumentException - if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.

SSLServerSocket

protected SSLServerSocket(int port,
                          int backlog)
                   throws IOException

Used only by subclasses.

Create a TCP server socket on a port, using the default authentication context and a specified backlog of connections.

A port number of 0 creates a socket on any free port.

The backlog argument is the requested maximum number of pending connections on the socket. Its exact semantics are implementation specific. In particular, an implementation may impose a maximum length or may choose to ignore the parameter altogther. The value provided should be greater than 0. If it is less than or equal to 0, then an implementation specific default will be used.

If there is a security manager, its checkListen method is called with the port argument as its argument to ensure the operation is allowed. This could result in a SecurityException.

Parameters:

port - the port on which to listen

backlog - requested maximum length of the queue of incoming connections.

Throws:

IOException - if an I/O error occurs when creating the socket

SecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

IllegalArgumentException - if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.

SSLServerSocket

protected SSLServerSocket(int port,
                          int backlog,
                          InetAddress address)
                   throws IOException

Used only by subclasses.

Create a TCP server socket on a port, using the default authentication context and a specified backlog of connections as well as a particular specified network interface. This constructor is used on multihomed hosts, such as those used for firewalls or as routers, to control through which interface a network service is provided.

If there is a security manager, its checkListen method is called with the port argument as its argument to ensure the operation is allowed. This could result in a SecurityException.

A port number of 0 creates a socket on any free port.

The backlog argument is the requested maximum number of pending connections on the socket. Its exact semantics are implementation specific. In particular, an implementation may impose a maximum length or may choose to ignore the parameter altogther. The value provided should be greater than 0. If it is less than or equal to 0, then an implementation specific default will be used.

If address is null, it will default accepting connections on any/all local addresses.

Parameters:

port - the port on which to listen

backlog - requested maximum length of the queue of incoming connections.

address - the address of the network interface through which connections will be accepted

Throws:

IOException - if an I/O error occurs when creating the socket

SecurityException - if a security manager exists and its checkListen method doesn't allow the operation.

IllegalArgumentException - if the port parameter is outside the specified range of valid port values, which is between 0 and 65535, inclusive.

Method Detail

getNeedClientAuth

public abstract boolean getNeedClientAuth()

Returns true if client authentication will be required on newly accepted server-mode SSLSockets.

The initial inherited setting may be overridden by calling SSLSocket.setNeedClientAuth(boolean)

Returns:

true if client authentication is required, or false if no client authentication is desired.

See Also:

setNeedClientAuth(boolean), setUseClientMode(boolean)

getUseClientMode

public abstract boolean getUseClientMode()

Returns true if accepted connections will be in SSL client mode.

Returns:

true if the connection should use SSL client mode.

See Also:

setUseClientMode(boolean)

setNeedClientAuth

public abstract void setNeedClientAuth(boolean need)

Controls whether accepted server-mode SSLSockets will be initially configured to require client authentication.

A socket's client authentication setting is one of the following:

• client authentication required
• client authentication requested
• no client authentication desired

If the accepted socket's option is set and the client chooses not to provide authentication information about itself, the negotiations will stop and the connection will be dropped.

The initial inherited setting may be overridden by calling SSLSocket.setNeedClientAuth(boolean)

Parameters:

need - set to true if client authentication is required, or false if no client authentication is desired.

See Also:

getNeedClientAuth(), setUseClientMode(boolean)

setUseClientMode

public abstract void setUseClientMode(boolean mode)

Controls whether accepted connections are in the (default) SSL server mode, or the SSL client mode.

Servers normally authenticate themselves, and clients are not required to do so.

In rare cases, TCP servers need to act in the SSL client mode on newly accepted connections. For example, FTP clients acquire server sockets and listen there for reverse connections from the server. An FTP client would use an SSLServerSocket in "client" mode to accept the reverse connection while the FTP server uses an SSLSocket with "client" mode disabled to initiate the connection. During the resulting handshake, existing SSL sessions may be reused.

SSLSockets returned from accept() inherit this setting.

Parameters:

mode - true if newly accepted connections should use SSL client mode.

See Also:

getUseClientMode()