twisted.conch.ssh.transport.SSHClientTransport : API documentation

t.c.s.t.SSHClientTransport(SSHTransportBase) : class documentation

SSHClientTransport implements the client side of the SSH protocol.

Instance Variables	isClient	since we are always the client, this is always True.
	_gotNewKeys	if we receive a MSG_NEWKEYS message before we are ready to transition to the new keys, this is set to True so we can transition when the keys are ready locally.
	x	our Diffie-Hellman private key.
	e	our Diffie-Hellman public key.
	g	the Diffie-Hellman group generator.
	p	the Diffie-Hellman group prime
	instance	the SSHService object we are requesting.

Method	connectionMade	Called when the connection is started with the server. Just sets up a private instance variable.
Method	ssh_KEXINIT	No summary
Method	ssh_KEX_DH_GEX_GROUP	This handles two different message which share an integer value.
Method	ssh_KEX_DH_GEX_REPLY	Called when we receieve a MSG_KEX_DH_GEX_REPLY message. Payload:: string server host key integer f (server DH public key)
Method	ssh_NEWKEYS	Called when we receieve a MSG_NEWKEYS message. No payload. If we've finished setting up our own keys, start using them. Otherwise, remeber that we've receieved this message.
Method	ssh_SERVICE_ACCEPT	Called when we receieve a MSG_SERVICE_ACCEPT message. Payload:: string service name
Method	requestService	Request that a service be run over this transport.
Method	verifyHostKey	Returns a Deferred that gets a callback if it is a valid key, or an errback if not.
Method	connectionSecure	Called when the encryption has been set up. Generally, requestService() is called to run another service over the transport.
Method	_ssh_KEXDH_REPLY	Called to handle a reply to a diffie-hellman-group1-sha1 key exchange message (KEXDH_INIT).
Method	_continueKEXDH_REPLY	The host key has been verified, so we generate the keys.
Method	_continueGEX_REPLY	The host key has been verified, so we generate the keys.
Method	_keySetup	See SSHTransportBase._keySetup().

Inherited from SSHTransportBase:

Method	connectionLost	Called when the connection is shut down.
Method	sendKexInit	Send a KEXINIT message to initiate key exchange or to respond to a key exchange initiated by the peer.
Method	sendPacket	Sends a packet. If it's been set up, compress the data, encrypt it, and authenticate it before sending. If key exchange is in progress and the message is not part of key exchange, queue it to be sent later.
Method	getPacket	Try to return a decrypted, authenticated, and decompressed packet out of the buffer. If there is not enough data, return None.
Method	dataReceived	First, check for the version string (SSH-2.0-*). After that has been received, this method adds data to the buffer, and pulls out any packets.
Method	dispatchMessage	Send a received message to the appropriate method.
Method	ssh_DISCONNECT	Called when we receive a MSG_DISCONNECT message. Payload:: long code string description
Method	ssh_IGNORE	Called when we receieve a MSG_IGNORE message. No payload. This means nothing; we simply return.
Method	ssh_UNIMPLEMENTED	Called when we receieve a MSG_UNIMPLEMENTED message. Payload:: long packet
Method	ssh_DEBUG	No summary
Method	setService	Set our service to service and start it running. If we were running a service previously, stop it first.
Method	sendDebug	Send a debug message to the other side.
Method	sendIgnore	Send a message that will be ignored by the other side. This is useful to fool attacks based on guessing packet sizes in the encrypted stream.
Method	sendUnimplemented	Send a message to the other side that the last packet was not understood.
Method	sendDisconnect	Send a disconnect message to the other side and then disconnect.
Method	isEncrypted	Return True if the connection is encrypted in the given direction. Direction must be one of ["out", "in", "both"].
Method	isVerified	Return True if the connecction is verified/authenticated in the given direction. Direction must be one of ["out", "in", "both"].
Method	loseConnection	Lose the connection to the other side, sending a DISCONNECT_CONNECTION_LOST message.
Method	receiveError	Called when we receive a disconnect error message from the other side.
Method	receiveUnimplemented	Called when we receive an unimplemented packet message from the other side.
Method	receiveDebug	Called when we receive a debug message from the other side.
Method	_allowedKeyExchangeMessageType	Determine if the given message type may be sent while key exchange is in progress.
Method	_unsupportedVersionReceived	Called when an unsupported version of the ssh protocol is received from the remote endpoint.
Method	_getKey	Get one of the keys for authentication/encryption.
Method	_newKeys	No summary

Inherited from BaseProtocol (via SSHTransportBase, Protocol):

Method

makeConnection

Make a connection to a transport and a server.

def ssh_KEXINIT(self, packet): (source)

overrides twisted.conch.ssh.transport.SSHTransportBase.ssh_KEXINIT

Called when we receive a MSG_KEXINIT message. For a description of the packet, see SSHTransportBase.ssh_KEXINIT(). Additionally, this method sends the first key exchange packet. If the agreed-upon exchange is diffie-hellman-group1-sha1, generate a public key and send it in a MSG_KEXDH_INIT message. If the exchange is diffie-hellman-group-exchange-sha1, ask for a 2048 bit group with a MSG_KEX_DH_GEX_REQUEST_OLD message.

def _ssh_KEXDH_REPLY(self, packet): (source)

Called to handle a reply to a diffie-hellman-group1-sha1 key exchange message (KEXDH_INIT).

Like the handler for KEXDH_INIT, this message type has an overlapping value. This method is called from ssh_KEX_DH_GEX_GROUP if that method detects a diffie-hellman-group1-sha1 key exchange is in progress.

Payload:

   string serverHostKey
   integer f (server Diffie-Hellman public key)
   string signature

We verify the host key by calling verifyHostKey, then continue in _continueKEXDH_REPLY.

def ssh_KEX_DH_GEX_GROUP(self, packet): (source)

This handles two different message which share an integer value.

If the key exchange is diffie-hellman-group-exchange-sha1, this is MSG_KEX_DH_GEX_GROUP. Payload:

   string g (group generator)
   string p (group prime)

We generate a Diffie-Hellman public key and send it in a MSG_KEX_DH_GEX_INIT message.

def _continueKEXDH_REPLY(self, ignored, pubKey, f, signature): (source)

The host key has been verified, so we generate the keys.

Parameters	pubKey	the public key blob for the server's public key. (type: `str` )
	f	the server's Diffie-Hellman public key. (type: `long` )
	signature	the server's signature, verifying that it has the correct private key. (type: `str` )

def ssh_KEX_DH_GEX_REPLY(self, packet): (source)

Called when we receieve a MSG_KEX_DH_GEX_REPLY message. Payload:

   string server host key
   integer f (server DH public key)

We verify the host key by calling verifyHostKey, then continue in _continueGEX_REPLY.

def _continueGEX_REPLY(self, ignored, pubKey, f, signature): (source)

The host key has been verified, so we generate the keys.

Parameters	pubKey	the public key blob for the server's public key. (type: `str` )
	f	the server's Diffie-Hellman public key. (type: `long` )
	signature	the server's signature, verifying that it has the correct private key. (type: `str` )

def _keySetup(self, sharedSecret, exchangeHash): (source)

overrides twisted.conch.ssh.transport.SSHTransportBase._keySetup

See SSHTransportBase._keySetup().

def ssh_NEWKEYS(self, packet): (source)

Called when we receieve a MSG_NEWKEYS message. No payload. If we've finished setting up our own keys, start using them. Otherwise, remeber that we've receieved this message.

def ssh_SERVICE_ACCEPT(self, packet): (source)

Called when we receieve a MSG_SERVICE_ACCEPT message. Payload:

   string service name

Start the service we requested.

def requestService(self, instance): (source)

Request that a service be run over this transport.

Parameters instance (type: subclass of twisted.conch.ssh.service.SSHService )

def verifyHostKey(self, hostKey, fingerprint): (source)

overridden in twisted.conch.client.direct.SSHClientTransport, twisted.conch.scripts.tkconch.SSHClientTransport

Returns a Deferred that gets a callback if it is a valid key, or an errback if not.

Parameters	hostKey	(type: `str` )
	fingerprint	(type: `str` )
Returns	(type: `twisted.internet.defer.Deferred` )

def connectionSecure(self): (source)

overridden in twisted.conch.client.direct.SSHClientTransport, twisted.conch.scripts.tkconch.SSHClientTransport

Called when the encryption has been set up. Generally, requestService() is called to run another service over the transport.