Current File : //lib/python3/dist-packages/twisted/conch/test/test_session.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for the 'session' channel implementation in twisted.conch.ssh.session.
See also RFC 4254.
"""
import os
import signal
import struct
import sys
from unittest import skipIf
from zope.interface import implementer
from twisted.internet import defer, error, protocol
from twisted.internet.address import IPv4Address
from twisted.internet.error import ProcessDone, ProcessTerminated
from twisted.python import components, failure
from twisted.python.failure import Failure
from twisted.python.reflect import requireModule
from twisted.python.test.test_components import RegistryUsingMixin
from twisted.trial.unittest import TestCase
cryptography = requireModule("cryptography")
if cryptography:
from twisted.conch.ssh import common, connection, session
else:
class session: # type: ignore[no-redef]
from twisted.conch.interfaces import (
EnvironmentVariableNotPermitted,
ISession,
ISessionSetEnv,
)
class SubsystemOnlyAvatar:
"""
A stub class representing an avatar that is only useful for
getting a subsystem.
"""
def lookupSubsystem(self, name, data):
"""
If the other side requests the 'subsystem' subsystem, allow it by
returning a MockProtocol to implement it. Otherwise raise an assertion.
"""
assert name == b"subsystem"
return MockProtocol()
class StubAvatar:
"""
A stub class representing the avatar representing the authenticated user.
It implements the I{ISession} interface.
"""
def lookupSubsystem(self, name, data):
"""
If the user requests the TestSubsystem subsystem, connect them to a
MockProtocol. If they request neither, then None is returned which is
interpreted by SSHSession as a failure.
"""
if name == b"TestSubsystem":
self.subsystem = MockProtocol()
self.subsystem.packetData = data
return self.subsystem
@implementer(session.ISession)
class StubSessionForStubAvatar:
"""
A stub ISession implementation for our StubAvatar. The instance
variables generally keep track of method invocations so that we can test
that the methods were called.
@ivar avatar: the L{StubAvatar} we are adapting.
@ivar ptyRequest: if present, the terminal, window size, and modes passed
to the getPty method.
@ivar windowChange: if present, the window size passed to the
windowChangned method.
@ivar shellProtocol: if present, the L{SSHSessionProcessProtocol} passed
to the openShell method.
@ivar shellTransport: if present, the L{EchoTransport} connected to
shellProtocol.
@ivar execProtocol: if present, the L{SSHSessionProcessProtocol} passed
to the execCommand method.
@ivar execTransport: if present, the L{EchoTransport} connected to
execProtocol.
@ivar execCommandLine: if present, the command line passed to the
execCommand method.
@ivar gotEOF: if present, an EOF message was received.
@ivar gotClosed: if present, a closed message was received.
"""
def __init__(self, avatar):
"""
Store the avatar we're adapting.
"""
self.avatar = avatar
self.shellProtocol = None
def getPty(self, terminal, window, modes):
"""
If the terminal is 'bad', fail. Otherwise, store the information in
the ptyRequest variable.
"""
if terminal != b"bad":
self.ptyRequest = (terminal, window, modes)
else:
raise RuntimeError("not getting a pty")
def windowChanged(self, window):
"""
If all the window sizes are 0, fail. Otherwise, store the size in the
windowChange variable.
"""
if window == (0, 0, 0, 0):
raise RuntimeError("not changing the window size")
else:
self.windowChange = window
def openShell(self, pp):
"""
If we have gotten a shell request before, fail. Otherwise, store the
process protocol in the shellProtocol variable, connect it to the
EchoTransport and store that as shellTransport.
"""
if self.shellProtocol is not None:
raise RuntimeError("not getting a shell this time")
else:
self.shellProtocol = pp
self.shellTransport = EchoTransport(pp)
def execCommand(self, pp, command):
"""
If the command is 'true', store the command, the process protocol, and
the transport we connect to the process protocol. Otherwise, just
store the command and raise an error.
"""
self.execCommandLine = command
if command == b"success":
self.execProtocol = pp
elif command[:6] == b"repeat":
self.execProtocol = pp
self.execTransport = EchoTransport(pp)
pp.outReceived(command[7:])
else:
raise RuntimeError("not getting a command")
def eofReceived(self):
"""
Note that EOF has been received.
"""
self.gotEOF = True
def closed(self):
"""
Note that close has been received.
"""
self.gotClosed = True
@implementer(session.ISessionSetEnv)
class StubSessionForStubAvatarWithEnv(StubSessionForStubAvatar):
"""
Same as StubSessionForStubAvatar, but supporting environment variables
setting.
End users would want to have the same class annotated with
C{@implementer(session.ISession, session.ISessionSetEnv)}. The interfaces
are split for backwards compatibility, so we split it here to test
this compatibility too.
@ivar environ: a L{dict} of environment variables passed to the setEnv
method.
"""
def __init__(self, avatar):
super().__init__(avatar)
# The representation of the environment as updated by remote requests.
self.environ = {}
# A snapshot of the environment when PTY request is received.
self.environAtPty = {}
def setEnv(self, name, value):
"""
If the requested environment variable is 'FAIL', fail. If it is
'IGNORED', raise EnvironmentVariableNotPermitted, which should cause
it to be silently ignored. Otherwise, store the requested
environment variable.
(Real applications should normally implement an allowed list rather
than a blocked list.)
"""
if name == b"FAIL":
raise RuntimeError("disallowed environment variable name")
elif name == b"IGNORED":
raise session.EnvironmentVariableNotPermitted(
"ignored environment variable name"
)
else:
self.environ[name] = value
def getPty(self, term, windowSize, modes):
"""
Just a simple implementation which records the current environment
when PTY is requested.
"""
self.environAtPty = self.environ.copy()
class EchoTransport:
"""
A transport for a ProcessProtocol which echos data that is sent to it with
a Window newline (CR LF) appended to it. If a null byte is in the data,
disconnect. When we are asked to disconnect, disconnect the
C{ProcessProtocol} with a 0 exit code.
@ivar proto: the C{ProcessProtocol} connected to us.
@ivar data: a L{bytes} of data written to us.
"""
def __init__(self, processProtocol):
"""
Initialize our instance variables.
@param processProtocol: a C{ProcessProtocol} to connect to ourself.
"""
self.proto = processProtocol
self.closed = False
self.data = b""
processProtocol.makeConnection(self)
def write(self, data):
"""
We got some data. Give it back to our C{ProcessProtocol} with
a newline attached. Disconnect if there's a null byte.
"""
self.data += data
self.proto.outReceived(data)
self.proto.outReceived(b"\r\n")
if b"\x00" in data: # mimic 'exit' for the shell test
self.loseConnection()
def loseConnection(self):
"""
If we're asked to disconnect (and we haven't already) shut down
the C{ProcessProtocol} with a 0 exit code.
"""
if self.closed:
return
self.closed = 1
self.proto.inConnectionLost()
self.proto.outConnectionLost()
self.proto.errConnectionLost()
self.proto.processEnded(failure.Failure(error.ProcessTerminated(0, None, None)))
class MockProtocol(protocol.Protocol):
"""
A sample Protocol which stores the data passed to it.
@ivar packetData: a L{bytes} of data to be sent when the connection is
made.
@ivar data: a L{bytes} of the data passed to us.
@ivar open: True if the channel is open.
@ivar reason: if not None, the reason the protocol was closed.
"""
packetData = b""
def connectionMade(self):
"""
Set up the instance variables. If we have any packetData, send it
along.
"""
self.data = b""
self.open = True
self.reason = None
if self.packetData:
self.dataReceived(self.packetData)
def dataReceived(self, data):
"""
Store the received data and write it back with a tilde appended.
The tilde is appended so that the tests can verify that we processed
the data.
"""
self.data += data
self.transport.write(data + b"~")
def connectionLost(self, reason):
"""
Close the protocol and store the reason.
"""
self.open = False
self.reason = reason
class StubConnection:
"""
A stub for twisted.conch.ssh.connection.SSHConnection. Record the data
that channels send, and when they try to close the connection.
@ivar data: a L{dict} mapping C{SSHChannel}s to a C{list} of L{bytes} of
data they sent.
@ivar extData: a L{dict} mapping L{SSHChannel}s to a C{list} of L{tuple} of
(L{int}, L{bytes}) of extended data they sent.
@ivar requests: a L{dict} mapping L{SSHChannel}s to a C{list} of L{tuple}
of (L{str}, L{bytes}) of channel requests they made.
@ivar eofs: a L{dict} mapping L{SSHChannel}s to C{true} if they have sent
an EOF.
@ivar closes: a L{dict} mapping L{SSHChannel}s to C{true} if they have sent
a close.
"""
def __init__(self, transport=None):
"""
Initialize our instance variables.
"""
self.data = {}
self.extData = {}
self.requests = {}
self.eofs = {}
self.closes = {}
self.transport = transport
def logPrefix(self):
"""
Return our logging prefix.
"""
return "MockConnection"
def sendData(self, channel, data):
"""
Record the sent data.
"""
if self.closes.get(channel):
return
self.data.setdefault(channel, []).append(data)
def sendExtendedData(self, channel, type, data):
"""
Record the sent extended data.
"""
if self.closes.get(channel):
return
self.extData.setdefault(channel, []).append((type, data))
def sendRequest(self, channel, request, data, wantReply=False):
"""
Record the sent channel request.
"""
if self.closes.get(channel):
return
self.requests.setdefault(channel, []).append((request, data, wantReply))
if wantReply:
return defer.succeed(None)
def sendEOF(self, channel):
"""
Record the sent EOF.
"""
if self.closes.get(channel):
return
self.eofs[channel] = True
def sendClose(self, channel):
"""
Record the sent close.
"""
self.closes[channel] = True
class StubTransport:
"""
A stub transport which records the data written.
@ivar buf: the data sent to the transport.
@type buf: L{bytes}
@ivar close: flags indicating if the transport has been closed.
@type close: L{bool}
"""
buf = b""
close = False
def getPeer(self):
"""
Return an arbitrary L{IAddress}.
"""
return IPv4Address("TCP", "remotehost", 8888)
def getHost(self):
"""
Return an arbitrary L{IAddress}.
"""
return IPv4Address("TCP", "localhost", 9999)
def write(self, data):
"""
Record data in the buffer.
"""
self.buf += data
def loseConnection(self):
"""
Note that the connection was closed.
"""
self.close = True
def setTcpNoDelay(self, enabled):
"""
Pretend to set C{TCP_NODELAY}.
"""
# Required for testing SSHSessionForUnixConchUser.
class StubTransportWithWriteErr(StubTransport):
"""
A version of StubTransport which records the error data sent to it.
@ivar err: the extended data sent to the transport.
@type err: L{bytes}
"""
err = b""
def writeErr(self, data):
"""
Record the extended data in the buffer. This was an old interface
that allowed the Transports from ISession.openShell() or
ISession.execCommand() to receive extended data from the client.
"""
self.err += data
class StubClient:
"""
A stub class representing the client to a SSHSession.
@ivar transport: A L{StubTransport} object which keeps track of the data
passed to it.
"""
def __init__(self):
self.transport = StubTransportWithWriteErr()
class SessionInterfaceTests(RegistryUsingMixin, TestCase):
"""
Tests for the SSHSession class interface. This interface is not ideal, but
it is tested in order to maintain backwards compatibility.
"""
if not cryptography:
skip = "cannot run without cryptography"
def setUp(self, register_adapters=True):
"""
Make an SSHSession object to test. Give the channel some window
so that it's allowed to send packets. 500 and 100 are arbitrary
values.
"""
RegistryUsingMixin.setUp(self)
self.session = self.getSSHSession()
if register_adapters:
components.registerAdapter(
StubSessionForStubAvatarWithEnv, StubAvatar, session.ISession
)
self.session = self.getSSHSession()
def getSSHSession(self, register_adapters=True):
"""
Return a new SSH session.
"""
return session.SSHSession(
remoteWindow=500,
remoteMaxPacket=100,
conn=StubConnection(),
avatar=StubAvatar(),
)
def assertSessionIsStubSession(self):
"""
Asserts that self.session.session is an instance of
StubSessionForStubOldAvatar.
"""
self.assertIsInstance(self.session.session, StubSessionForStubAvatar)
def test_init(self):
"""
SSHSession initializes its buffer (buf), client, and ISession adapter.
The avatar should not need to be adaptable to an ISession immediately.
"""
s = session.SSHSession(avatar=object) # use object because it doesn't
# have an adapter
self.assertEqual(s.buf, b"")
self.assertIsNone(s.client)
self.assertIsNone(s.session)
def test_client_dataReceived(self):
"""
SSHSession.dataReceived() passes data along to a client. If the data
comes before there is a client, the data should be discarded.
"""
self.session.dataReceived(b"1")
self.session.client = StubClient()
self.session.dataReceived(b"2")
self.assertEqual(self.session.client.transport.buf, b"2")
def test_client_extReceived(self):
"""
SSHSession.extReceived() passed data of type EXTENDED_DATA_STDERR along
to the client. If the data comes before there is a client, or if the
data is not of type EXTENDED_DATA_STDERR, it is discared.
"""
self.session.extReceived(connection.EXTENDED_DATA_STDERR, b"1")
self.session.extReceived(255, b"2") # 255 is arbitrary
self.session.client = StubClient()
self.session.extReceived(connection.EXTENDED_DATA_STDERR, b"3")
self.assertEqual(self.session.client.transport.err, b"3")
def test_client_extReceivedWithoutWriteErr(self):
"""
SSHSession.extReceived() should handle the case where the transport
on the client doesn't have a writeErr method.
"""
client = self.session.client = StubClient()
client.transport = StubTransport() # doesn't have writeErr
# should not raise an error
self.session.extReceived(connection.EXTENDED_DATA_STDERR, b"ignored")
def test_client_closed(self):
"""
SSHSession.closed() should tell the transport connected to the client
that the connection was lost.
"""
self.session.client = StubClient()
self.session.closed()
self.assertTrue(self.session.client.transport.close)
self.session.client.transport.close = False
def test_client_closed_with_env_subsystem(self):
"""
If the peer requests an environment variable in its setup process
followed by requesting a subsystem, SSHSession.closed() should tell
the transport connected to the client that the connection was lost.
"""
self.assertTrue(
self.session.requestReceived(b"env", common.NS(b"FOO") + common.NS(b"bar"))
)
self.assertTrue(
self.session.requestReceived(
b"subsystem", common.NS(b"TestSubsystem") + b"data"
)
)
self.session.client = StubClient()
self.session.closed()
self.assertTrue(self.session.client.transport.close)
self.session.client.transport.close = False
def test_badSubsystemDoesNotCreateClient(self):
"""
When a subsystem request fails, SSHSession.client should not be set.
"""
ret = self.session.requestReceived(b"subsystem", common.NS(b"BadSubsystem"))
self.assertFalse(ret)
self.assertIsNone(self.session.client)
def test_lookupSubsystem(self):
"""
When a client requests a subsystem, the SSHSession object should get
the subsystem by calling avatar.lookupSubsystem, and attach it as
the client.
"""
ret = self.session.requestReceived(
b"subsystem", common.NS(b"TestSubsystem") + b"data"
)
self.assertTrue(ret)
self.assertIsInstance(self.session.client, protocol.ProcessProtocol)
self.assertIs(
self.session.client.transport.proto, self.session.avatar.subsystem
)
def test_lookupSubsystemDoesNotNeedISession(self):
"""
Previously, if one only wanted to implement a subsystem, an ISession
adapter wasn't needed because subsystems were looked up using the
lookupSubsystem method on the avatar.
"""
s = session.SSHSession(avatar=SubsystemOnlyAvatar(), conn=StubConnection())
ret = s.request_subsystem(common.NS(b"subsystem") + b"data")
self.assertTrue(ret)
self.assertIsNotNone(s.client)
self.assertIsNone(s.conn.closes.get(s))
s.eofReceived()
self.assertTrue(s.conn.closes.get(s))
# these should not raise errors
s.loseConnection()
s.closed()
def test_lookupSubsystem_data(self):
"""
After having looked up a subsystem, data should be passed along to the
client. Additionally, subsystems were passed the entire request packet
as data, instead of just the additional data.
We check for the additional tidle to verify that the data passed
through the client.
"""
# self.session.dataReceived('1')
# subsystems didn't get extended data
# self.session.extReceived(connection.EXTENDED_DATA_STDERR, '2')
self.session.requestReceived(
b"subsystem", common.NS(b"TestSubsystem") + b"data"
)
self.assertEqual(
self.session.conn.data[self.session],
[b"\x00\x00\x00\x0dTestSubsystemdata~"],
)
self.session.dataReceived(b"more data")
self.assertEqual(self.session.conn.data[self.session][-1], b"more data~")
def test_lookupSubsystem_closeReceived(self):
"""
SSHSession.closeReceived() should sent a close message to the remote
side.
"""
self.session.requestReceived(
b"subsystem", common.NS(b"TestSubsystem") + b"data"
)
self.session.closeReceived()
self.assertTrue(self.session.conn.closes[self.session])
def assertRequestRaisedRuntimeError(self):
"""
Assert that the request we just made raised a RuntimeError (and only a
RuntimeError).
"""
errors = self.flushLoggedErrors(RuntimeError)
self.assertEqual(
len(errors),
1,
"Multiple RuntimeErrors raised: %s"
% "\n".join([repr(error) for error in errors]),
)
errors[0].trap(RuntimeError)
def test_requestShell(self):
"""
When a client requests a shell, the SSHSession object should get
the shell by getting an ISession adapter for the avatar, then
calling openShell() with a ProcessProtocol to attach.
"""
# gets a shell the first time
ret = self.session.requestReceived(b"shell", b"")
self.assertTrue(ret)
self.assertSessionIsStubSession()
self.assertIsInstance(self.session.client, session.SSHSessionProcessProtocol)
self.assertIs(self.session.session.shellProtocol, self.session.client)
# doesn't get a shell the second time
self.assertFalse(self.session.requestReceived(b"shell", b""))
self.assertRequestRaisedRuntimeError()
def test_requestShellWithData(self):
"""
When a client executes a shell, it should be able to give pass data
back and forth between the local and the remote side.
"""
ret = self.session.requestReceived(b"shell", b"")
self.assertTrue(ret)
self.assertSessionIsStubSession()
self.session.dataReceived(b"some data\x00")
self.assertEqual(self.session.session.shellTransport.data, b"some data\x00")
self.assertEqual(
self.session.conn.data[self.session], [b"some data\x00", b"\r\n"]
)
self.assertTrue(self.session.session.shellTransport.closed)
self.assertEqual(
self.session.conn.requests[self.session],
[(b"exit-status", b"\x00\x00\x00\x00", False)],
)
def test_requestExec(self):
"""
When a client requests a command, the SSHSession object should get
the command by getting an ISession adapter for the avatar, then
calling execCommand with a ProcessProtocol to attach and the
command line.
"""
ret = self.session.requestReceived(b"exec", common.NS(b"failure"))
self.assertFalse(ret)
self.assertRequestRaisedRuntimeError()
self.assertIsNone(self.session.client)
self.assertTrue(self.session.requestReceived(b"exec", common.NS(b"success")))
self.assertSessionIsStubSession()
self.assertIsInstance(self.session.client, session.SSHSessionProcessProtocol)
self.assertIs(self.session.session.execProtocol, self.session.client)
self.assertEqual(self.session.session.execCommandLine, b"success")
def test_requestExecWithData(self):
"""
When a client executes a command, it should be able to give pass data
back and forth.
"""
ret = self.session.requestReceived(b"exec", common.NS(b"repeat hello"))
self.assertTrue(ret)
self.assertSessionIsStubSession()
self.session.dataReceived(b"some data")
self.assertEqual(self.session.session.execTransport.data, b"some data")
self.assertEqual(
self.session.conn.data[self.session], [b"hello", b"some data", b"\r\n"]
)
self.session.eofReceived()
self.session.closeReceived()
self.session.closed()
self.assertTrue(self.session.session.execTransport.closed)
self.assertEqual(
self.session.conn.requests[self.session],
[(b"exit-status", b"\x00\x00\x00\x00", False)],
)
def test_requestPty(self):
"""
When a client requests a PTY, the SSHSession object should make
the request by getting an ISession adapter for the avatar, then
calling getPty with the terminal type, the window size, and any modes
the client gave us.
"""
# Cleanup the registered adapters from setUp.
self.doCleanups()
self.setUp(register_adapters=False)
components.registerAdapter(
StubSessionForStubAvatar, StubAvatar, session.ISession
)
test_session = self.getSSHSession()
# 'bad' terminal type fails
ret = test_session.requestReceived(
b"pty_req", session.packRequest_pty_req(b"bad", (1, 2, 3, 4), b"")
)
self.assertFalse(ret)
self.assertIsInstance(test_session.session, StubSessionForStubAvatar)
self.assertRequestRaisedRuntimeError()
# 'good' terminal type succeeds
self.assertTrue(
test_session.requestReceived(
b"pty_req", session.packRequest_pty_req(b"good", (1, 2, 3, 4), b"")
)
)
self.assertEqual(test_session.session.ptyRequest, (b"good", (1, 2, 3, 4), []))
def test_setEnv(self):
"""
When a client requests passing an environment variable, the
SSHSession object should make the request by getting an
ISessionSetEnv adapter for the avatar, then calling setEnv with the
environment variable name and value.
"""
# Blocked environment variable name fails.
self.assertFalse(
self.session.requestReceived(b"env", common.NS(b"FAIL") + common.NS(b"bad"))
)
self.assertIsInstance(self.session.session, StubSessionForStubAvatarWithEnv)
self.assertRequestRaisedRuntimeError()
# An environment variable name for which setEnv raises
# EnvironmentVariableNotPermitted is silently ignored.
self.assertFalse(
self.session.requestReceived(
b"env", common.NS(b"IGNORED") + common.NS(b"ignored")
)
)
self.assertEqual(self.flushLoggedErrors(), [])
# Allowed environment variable name succeeds.
self.assertTrue(
self.session.requestReceived(
b"env", common.NS(b"NAME") + common.NS(b"value")
)
)
self.assertEqual(self.session.session.environ, {b"NAME": b"value"})
def test_setEnvSessionShare(self):
"""
Multiple setenv requests will share the same session.
"""
test_session = self.getSSHSession()
self.assertTrue(
test_session.requestReceived(
b"env", common.NS(b"Key1") + common.NS(b"Value 1")
)
)
self.assertTrue(
test_session.requestReceived(
b"env", common.NS(b"Key2") + common.NS(b"Value2")
)
)
self.assertIsInstance(test_session.session, StubSessionForStubAvatarWithEnv)
self.assertEqual(
{b"Key1": b"Value 1", b"Key2": b"Value2"}, test_session.session.environ
)
def test_setEnvMultiplexShare(self):
"""
Calling another session service after setenv will provide the
previous session with the environment variables.
"""
test_session = self.getSSHSession()
test_session.requestReceived(b"env", common.NS(b"Key1") + common.NS(b"Value 1"))
test_session.requestReceived(b"env", common.NS(b"Key2") + common.NS(b"Value2"))
test_session.requestReceived(
b"pty_req", session.packRequest_pty_req(b"term", (0, 0, 0, 0), b"")
)
self.assertIsInstance(test_session.session, StubSessionForStubAvatarWithEnv)
self.assertEqual(
{b"Key1": b"Value 1", b"Key2": b"Value2"}, test_session.session.environAtPty
)
def test_setEnvNotProvidingISessionSetEnv(self):
"""
If the avatar does not have an ISessionSetEnv adapter, then a
request to pass an environment variable fails gracefully.
"""
# Cleanup the registered adapters.
self.doCleanups()
self.setUp(register_adapters=False)
# Register a ISession adapter that does not support ISessionSetEnv.
components.registerAdapter(
StubSessionForStubAvatar, StubAvatar, session.ISession
)
self.assertFalse(
self.session.requestReceived(
b"env", common.NS(b"NAME") + common.NS(b"value")
)
)
def test_requestWindowChange(self):
"""
When the client requests to change the window size, the SSHSession
object should make the request by getting an ISession adapter for the
avatar, then calling windowChanged with the new window size.
"""
ret = self.session.requestReceived(
b"window_change", session.packRequest_window_change((0, 0, 0, 0))
)
self.assertFalse(ret)
self.assertRequestRaisedRuntimeError()
self.assertSessionIsStubSession()
self.assertTrue(
self.session.requestReceived(
b"window_change", session.packRequest_window_change((1, 2, 3, 4))
)
)
self.assertEqual(self.session.session.windowChange, (1, 2, 3, 4))
def test_eofReceived(self):
"""
When an EOF is received and an ISession adapter is present, it should
be notified of the EOF message.
"""
self.session.session = session.ISession(self.session.avatar)
self.session.eofReceived()
self.assertTrue(self.session.session.gotEOF)
def test_closeReceived(self):
"""
When a close is received, the session should send a close message.
"""
ret = self.session.closeReceived()
self.assertIsNone(ret)
self.assertTrue(self.session.conn.closes[self.session])
def test_closed(self):
"""
When a close is received and an ISession adapter is present, it should
be notified of the close message.
"""
self.session.session = session.ISession(self.session.avatar)
self.session.closed()
self.assertTrue(self.session.session.gotClosed)
class SessionWithNoAvatarTests(RegistryUsingMixin, TestCase):
"""
Test for the SSHSession interface. Several of the methods (request_shell,
request_exec, request_pty_req, request_env, request_window_change) would
create a 'session' instance variable from the avatar if one didn't exist
when they were called.
"""
if not cryptography:
skip = "cannot run without cryptography"
def setUp(self):
RegistryUsingMixin.setUp(self)
components.registerAdapter(
StubSessionForStubAvatar, StubAvatar, session.ISession
)
self.session = session.SSHSession()
self.session.avatar = StubAvatar()
self.assertIsNone(self.session.session)
def assertSessionProvidesISession(self):
"""
self.session.session should provide I{ISession}.
"""
self.assertTrue(
session.ISession.providedBy(self.session.session),
"ISession not provided by %r" % self.session.session,
)
def test_requestShellGetsSession(self):
"""
If an ISession adapter isn't already present, request_shell should get
one.
"""
self.session.requestReceived(b"shell", b"")
self.assertSessionProvidesISession()
def test_requestExecGetsSession(self):
"""
If an ISession adapter isn't already present, request_exec should get
one.
"""
self.session.requestReceived(b"exec", common.NS(b"success"))
self.assertSessionProvidesISession()
def test_requestPtyReqGetsSession(self):
"""
If an ISession adapter isn't already present, request_pty_req should
get one.
"""
self.session.requestReceived(
b"pty_req", session.packRequest_pty_req(b"term", (0, 0, 0, 0), b"")
)
self.assertSessionProvidesISession()
def test_requestWindowChangeGetsSession(self):
"""
If an ISession adapter isn't already present, request_window_change
should get one.
"""
self.session.requestReceived(
b"window_change", session.packRequest_window_change((1, 1, 1, 1))
)
self.assertSessionProvidesISession()
class WrappersTests(TestCase):
"""
A test for the wrapProtocol and wrapProcessProtocol functions.
"""
if not cryptography:
skip = "cannot run without cryptography"
def test_wrapProtocol(self):
"""
L{wrapProtocol}, when passed a L{Protocol} should return something that
has write(), writeSequence(), loseConnection() methods which call the
Protocol's dataReceived() and connectionLost() methods, respectively.
"""
protocol = MockProtocol()
protocol.transport = StubTransport()
protocol.connectionMade()
wrapped = session.wrapProtocol(protocol)
wrapped.dataReceived(b"dataReceived")
self.assertEqual(protocol.transport.buf, b"dataReceived")
wrapped.write(b"data")
wrapped.writeSequence([b"1", b"2"])
wrapped.loseConnection()
self.assertEqual(protocol.data, b"data12")
protocol.reason.trap(error.ConnectionDone)
def test_wrapProcessProtocol_Protocol(self):
"""
L{wrapPRocessProtocol}, when passed a L{Protocol} should return
something that follows the L{IProcessProtocol} interface, with
connectionMade() mapping to connectionMade(), outReceived() mapping to
dataReceived() and processEnded() mapping to connectionLost().
"""
protocol = MockProtocol()
protocol.transport = StubTransport()
process_protocol = session.wrapProcessProtocol(protocol)
process_protocol.connectionMade()
process_protocol.outReceived(b"data")
self.assertEqual(protocol.transport.buf, b"data~")
process_protocol.processEnded(
failure.Failure(error.ProcessTerminated(0, None, None))
)
protocol.reason.trap(error.ProcessTerminated)
class HelpersTests(TestCase):
"""
Tests for the 4 helper functions: parseRequest_* and packRequest_*.
"""
if not cryptography:
skip = "cannot run without cryptography"
def test_parseRequest_pty_req(self):
"""
The payload of a pty-req message is::
string terminal
uint32 columns
uint32 rows
uint32 x pixels
uint32 y pixels
string modes
Modes are::
byte mode number
uint32 mode value
"""
self.assertEqual(
session.parseRequest_pty_req(
common.NS(b"xterm")
+ struct.pack(">4L", 1, 2, 3, 4)
+ common.NS(struct.pack(">BL", 5, 6))
),
(b"xterm", (2, 1, 3, 4), [(5, 6)]),
)
def test_packRequest_pty_req_old(self):
"""
See test_parseRequest_pty_req for the payload format.
"""
packed = session.packRequest_pty_req(
b"xterm", (2, 1, 3, 4), b"\x05\x00\x00\x00\x06"
)
self.assertEqual(
packed,
common.NS(b"xterm")
+ struct.pack(">4L", 1, 2, 3, 4)
+ common.NS(struct.pack(">BL", 5, 6)),
)
def test_packRequest_pty_req(self):
"""
See test_parseRequest_pty_req for the payload format.
"""
packed = session.packRequest_pty_req(
b"xterm", (2, 1, 3, 4), b"\x05\x00\x00\x00\x06"
)
self.assertEqual(
packed,
common.NS(b"xterm")
+ struct.pack(">4L", 1, 2, 3, 4)
+ common.NS(struct.pack(">BL", 5, 6)),
)
def test_parseRequest_window_change(self):
"""
The payload of a window_change request is::
uint32 columns
uint32 rows
uint32 x pixels
uint32 y pixels
parseRequest_window_change() returns (rows, columns, x pixels,
y pixels).
"""
self.assertEqual(
session.parseRequest_window_change(struct.pack(">4L", 1, 2, 3, 4)),
(2, 1, 3, 4),
)
def test_packRequest_window_change(self):
"""
See test_parseRequest_window_change for the payload format.
"""
self.assertEqual(
session.packRequest_window_change((2, 1, 3, 4)),
struct.pack(">4L", 1, 2, 3, 4),
)
class SSHSessionProcessProtocolTests(TestCase):
"""
Tests for L{SSHSessionProcessProtocol}.
"""
if not cryptography:
skip = "cannot run without cryptography"
def setUp(self):
self.transport = StubTransport()
self.session = session.SSHSession(
conn=StubConnection(self.transport), remoteWindow=500, remoteMaxPacket=100
)
self.pp = session.SSHSessionProcessProtocol(self.session)
self.pp.makeConnection(self.transport)
def assertSessionClosed(self):
"""
Assert that C{self.session} is closed.
"""
self.assertTrue(self.session.conn.closes[self.session])
def assertRequestsEqual(self, expectedRequests):
"""
Assert that C{self.session} has sent the C{expectedRequests}.
"""
self.assertEqual(self.session.conn.requests[self.session], expectedRequests)
def test_init(self):
"""
SSHSessionProcessProtocol should set self.session to the session passed
to the __init__ method.
"""
self.assertEqual(self.pp.session, self.session)
def test_getHost(self):
"""
SSHSessionProcessProtocol.getHost() just delegates to its
session.conn.transport.getHost().
"""
self.assertEqual(self.session.conn.transport.getHost(), self.pp.getHost())
def test_getPeer(self):
"""
SSHSessionProcessProtocol.getPeer() just delegates to its
session.conn.transport.getPeer().
"""
self.assertEqual(self.session.conn.transport.getPeer(), self.pp.getPeer())
def test_connectionMade(self):
"""
SSHSessionProcessProtocol.connectionMade() should check if there's a
'buf' attribute on its session and write it to the transport if so.
"""
self.session.buf = b"buffer"
self.pp.connectionMade()
self.assertEqual(self.transport.buf, b"buffer")
@skipIf(not hasattr(signal, "SIGALRM"), "Not all signals available")
def test_getSignalName(self):
"""
_getSignalName should return the name of a signal when given the
signal number.
"""
for signalName in session.SUPPORTED_SIGNALS:
signalName = "SIG" + signalName
signalValue = getattr(signal, signalName)
sshName = self.pp._getSignalName(signalValue)
self.assertEqual(
sshName, signalName, "%i: %s != %s" % (signalValue, sshName, signalName)
)
@skipIf(not hasattr(signal, "SIGALRM"), "Not all signals available")
def test_getSignalNameWithLocalSignal(self):
"""
If there are signals in the signal module which aren't in the SSH RFC,
we map their name to [signal name]@[platform].
"""
signal.SIGTwistedTest = signal.NSIG + 1 # value can't exist normally
# Force reinitialization of signals
self.pp._signalValuesToNames = None
self.assertEqual(
self.pp._getSignalName(signal.SIGTwistedTest),
"SIGTwistedTest@" + sys.platform,
)
def test_outReceived(self):
"""
When data is passed to the outReceived method, it should be sent to
the session's write method.
"""
self.pp.outReceived(b"test data")
self.assertEqual(self.session.conn.data[self.session], [b"test data"])
def test_write(self):
"""
When data is passed to the write method, it should be sent to the
session channel's write method.
"""
self.pp.write(b"test data")
self.assertEqual(self.session.conn.data[self.session], [b"test data"])
def test_writeSequence(self):
"""
When a sequence is passed to the writeSequence method, it should be
joined together and sent to the session channel's write method.
"""
self.pp.writeSequence([b"test ", b"data"])
self.assertEqual(self.session.conn.data[self.session], [b"test data"])
def test_errReceived(self):
"""
When data is passed to the errReceived method, it should be sent to
the session's writeExtended method.
"""
self.pp.errReceived(b"test data")
self.assertEqual(self.session.conn.extData[self.session], [(1, b"test data")])
def test_outConnectionLost(self):
"""
When outConnectionLost and errConnectionLost are both called, we should
send an EOF message.
"""
self.pp.outConnectionLost()
self.assertFalse(self.session in self.session.conn.eofs)
self.pp.errConnectionLost()
self.assertTrue(self.session.conn.eofs[self.session])
def test_errConnectionLost(self):
"""
Make sure reverse ordering of events in test_outConnectionLost also
sends EOF.
"""
self.pp.errConnectionLost()
self.assertFalse(self.session in self.session.conn.eofs)
self.pp.outConnectionLost()
self.assertTrue(self.session.conn.eofs[self.session])
def test_loseConnection(self):
"""
When loseConnection() is called, it should call loseConnection
on the session channel.
"""
self.pp.loseConnection()
self.assertTrue(self.session.conn.closes[self.session])
def test_connectionLost(self):
"""
When connectionLost() is called, it should call loseConnection()
on the session channel.
"""
self.pp.connectionLost(failure.Failure(ProcessDone(0)))
def test_processEndedWithExitCode(self):
"""
When processEnded is called, if there is an exit code in the reason
it should be sent in an exit-status method. The connection should be
closed.
"""
self.pp.processEnded(Failure(ProcessDone(None)))
self.assertRequestsEqual([(b"exit-status", struct.pack(">I", 0), False)])
self.assertSessionClosed()
@skipIf(not hasattr(os, "WCOREDUMP"), "can't run this w/o os.WCOREDUMP")
def test_processEndedWithExitSignalCoreDump(self):
"""
When processEnded is called, if there is an exit signal in the reason
it should be sent in an exit-signal message. The connection should be
closed.
"""
self.pp.processEnded(
Failure(ProcessTerminated(1, signal.SIGTERM, 1 << 7))
) # 7th bit means core dumped
self.assertRequestsEqual(
[
(
b"exit-signal",
common.NS(b"TERM") # signal name
+ b"\x01" # core dumped is true
+ common.NS(b"") # error message
+ common.NS(b""), # language tag
False,
)
]
)
self.assertSessionClosed()
@skipIf(not hasattr(os, "WCOREDUMP"), "can't run this w/o os.WCOREDUMP")
def test_processEndedWithExitSignalNoCoreDump(self):
"""
When processEnded is called, if there is an exit signal in the
reason it should be sent in an exit-signal message. If no
core was dumped, don't set the core-dump bit.
"""
self.pp.processEnded(Failure(ProcessTerminated(1, signal.SIGTERM, 0)))
# see comments in test_processEndedWithExitSignalCoreDump for the
# meaning of the parts in the request
self.assertRequestsEqual(
[
(
b"exit-signal",
common.NS(b"TERM") + b"\x00" + common.NS(b"") + common.NS(b""),
False,
)
]
)
self.assertSessionClosed()
class SSHSessionClientTests(TestCase):
"""
SSHSessionClient is an obsolete class used to connect standard IO to
an SSHSession.
"""
if not cryptography:
skip = "cannot run without cryptography"
def test_dataReceived(self):
"""
When data is received, it should be sent to the transport.
"""
client = session.SSHSessionClient()
client.transport = StubTransport()
client.dataReceived(b"test data")
self.assertEqual(client.transport.buf, b"test data")
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