IpSecManager

See also:

• RFC 4301, Security Architecture for the Internet Protocol

DIRECTION_IN

public static final int DIRECTION_IN

Used when applying a transform to direct traffic through an IpSecTransform towards the host.

See applyTransportModeTransform(java.net.Socket, int, android.net.IpSecTransform).

Constant Value: 0 (0x00000000)

DIRECTION_OUT

public static final int DIRECTION_OUT

Used when applying a transform to direct traffic through an IpSecTransform away from the host.

See applyTransportModeTransform(java.net.Socket, int, android.net.IpSecTransform).

Constant Value: 1 (0x00000001)

allocateSecurityParameterIndex

public IpSecManager.SecurityParameterIndex allocateSecurityParameterIndex (InetAddress destinationAddress)

Reserve a random SPI for traffic bound to or from the specified destination address.

If successful, this SPI is guaranteed available until released by a call to IpSecManager.SecurityParameterIndex.close().

allocateSecurityParameterIndex

public IpSecManager.SecurityParameterIndex allocateSecurityParameterIndex (InetAddress destinationAddress, 
                int requestedSpi)

Reserve the requested SPI for traffic bound to or from the specified destination address.

If successful, this SPI is guaranteed available until released by a call to IpSecManager.SecurityParameterIndex.close().

applyTransportModeTransform

public void applyTransportModeTransform (FileDescriptor socket, 
                int direction, 
                IpSecTransform transform)

Apply an IPsec transform to a socket.

This applies transport mode encapsulation to the given socket. Once applied, I/O on the socket will be encapsulated according to the parameters of the IpSecTransform. When the transform is removed from the socket by calling removeTransportModeTransforms(FileDescriptor), unprotected traffic can resume on that socket.

For security reasons, the destination address of any traffic on the socket must match the remote InetAddress of the IpSecTransform. Attempts to send traffic to any other IP address will result in an IOException. In addition, reads and writes on the socket will throw IOException if the user deactivates the transform (by calling IpSecTransform.close()) without calling removeTransportModeTransforms(FileDescriptor).

Note that when applied to TCP sockets, calling IpSecTransform.close() on an applied transform before completion of graceful shutdown may result in the shutdown sequence failing to complete. As such, applications requiring graceful shutdown MUST close the socket prior to deactivating the applied transform. Socket closure may be performed asynchronously (in batches), so the returning of a close function does not guarantee shutdown of a socket. Setting an SO_LINGER timeout results in socket closure being performed synchronously, and is sufficient to ensure shutdown. Specifically, if the transform is deactivated (by calling IpSecTransform.close()), prior to the socket being closed, the standard [FIN - FIN/ACK - ACK], or the reset [RST] packets are dropped due to the lack of a valid Transform. Similarly, if a socket without the SO_LINGER option set is closed, the delayed/batched FIN packets may be dropped.

Rekey Procedure

When applying a new tranform to a socket in the outbound direction, the previous transform will be removed and the new transform will take effect immediately, sending all traffic on the new transform; however, when applying a transform in the inbound direction, traffic on the old transform will continue to be decrypted and delivered until that transform is deallocated by calling IpSecTransform.close(). This overlap allows lossless rekey procedures where both transforms are valid until both endpoints are using the new transform and all in-flight packets have been received.

applyTransportModeTransform

public void applyTransportModeTransform (DatagramSocket socket, 
                int direction, 
                IpSecTransform transform)

Apply an IPsec transform to a datagram socket.

This applies transport mode encapsulation to the given socket. Once applied, I/O on the socket will be encapsulated according to the parameters of the IpSecTransform. When the transform is removed from the socket by calling removeTransportModeTransforms(FileDescriptor), unprotected traffic can resume on that socket.

For security reasons, the destination address of any traffic on the socket must match the remote InetAddress of the IpSecTransform. Attempts to send traffic to any other IP address will result in an IOException. In addition, reads and writes on the socket will throw IOException if the user deactivates the transform (by calling IpSecTransform.close()) without calling removeTransportModeTransforms(FileDescriptor).

Rekey Procedure

When applying a new tranform to a socket in the outbound direction, the previous transform will be removed and the new transform will take effect immediately, sending all traffic on the new transform; however, when applying a transform in the inbound direction, traffic on the old transform will continue to be decrypted and delivered until that transform is deallocated by calling IpSecTransform.close(). This overlap allows lossless rekey procedures where both transforms are valid until both endpoints are using the new transform and all in-flight packets have been received.

applyTransportModeTransform

public void applyTransportModeTransform (Socket socket, 
                int direction, 
                IpSecTransform transform)

Apply an IPsec transform to a stream socket.

This applies transport mode encapsulation to the given socket. Once applied, I/O on the socket will be encapsulated according to the parameters of the IpSecTransform. When the transform is removed from the socket by calling removeTransportModeTransforms(FileDescriptor), unprotected traffic can resume on that socket.

For security reasons, the destination address of any traffic on the socket must match the remote InetAddress of the IpSecTransform. Attempts to send traffic to any other IP address will result in an IOException. In addition, reads and writes on the socket will throw IOException if the user deactivates the transform (by calling IpSecTransform.close()) without calling removeTransportModeTransforms(FileDescriptor).

Note that when applied to TCP sockets, calling IpSecTransform.close() on an applied transform before completion of graceful shutdown may result in the shutdown sequence failing to complete. As such, applications requiring graceful shutdown MUST close the socket prior to deactivating the applied transform. Socket closure may be performed asynchronously (in batches), so the returning of a close function does not guarantee shutdown of a socket. Setting an SO_LINGER timeout results in socket closure being performed synchronously, and is sufficient to ensure shutdown. Specifically, if the transform is deactivated (by calling IpSecTransform.close()), prior to the socket being closed, the standard [FIN - FIN/ACK - ACK], or the reset [RST] packets are dropped due to the lack of a valid Transform. Similarly, if a socket without the SO_LINGER option set is closed, the delayed/batched FIN packets may be dropped.

Rekey Procedure

When applying a new tranform to a socket in the outbound direction, the previous transform will be removed and the new transform will take effect immediately, sending all traffic on the new transform; however, when applying a transform in the inbound direction, traffic on the old transform will continue to be decrypted and delivered until that transform is deallocated by calling IpSecTransform.close(). This overlap allows lossless rekey procedures where both transforms are valid until both endpoints are using the new transform and all in-flight packets have been received.

openUdpEncapsulationSocket

public IpSecManager.UdpEncapsulationSocket openUdpEncapsulationSocket (int port)

Open a socket for UDP encapsulation and bind to the given port.

See UdpEncapsulationSocket for the proper way to close the returned socket.

openUdpEncapsulationSocket

public IpSecManager.UdpEncapsulationSocket openUdpEncapsulationSocket ()

Open a socket for UDP encapsulation.

See UdpEncapsulationSocket for the proper way to close the returned socket.

The local port of the returned socket can be obtained by calling IpSecManager.UdpEncapsulationSocket.getPort().

removeTransportModeTransforms

public void removeTransportModeTransforms (FileDescriptor socket)

Remove an IPsec transform from a socket.

Once removed, traffic on the socket will not be encrypted. Removing transforms from a socket allows the socket to be reused for communication in the clear.

If an IpSecTransform object applied to this socket was deallocated by calling IpSecTransform.close(), then communication on the socket will fail until this method is called.

removeTransportModeTransforms

public void removeTransportModeTransforms (DatagramSocket socket)

Remove an IPsec transform from a datagram socket.

Once removed, traffic on the socket will not be encrypted. Removing transforms from a socket allows the socket to be reused for communication in the clear.

If an IpSecTransform object applied to this socket was deallocated by calling IpSecTransform.close(), then communication on the socket will fail until this method is called.

removeTransportModeTransforms

public void removeTransportModeTransforms (Socket socket)

Remove an IPsec transform from a stream socket.

Once removed, traffic on the socket will not be encrypted. Removing transforms from a socket allows the socket to be reused for communication in the clear.

If an IpSecTransform object applied to this socket was deallocated by calling IpSecTransform.close(), then communication on the socket will fail until this method is called.