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powershell.py
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# Copyright: (c) 2018, Jordan Borean (@jborean93) <jborean93@gmail.com>
# MIT License (see LICENSE or https://opensource.org/licenses/MIT)
import base64
import logging
import struct
import sys
import time
import types
import uuid
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from pypsrp.complex_objects import ApartmentState, Command, CommandMetadata, \
CommandParameter, CommandType, HostInfo, ObjectMeta, Pipeline, \
PipelineResultTypes, PSInvocationState, PSThreadOptions, \
RemoteStreamOptions, RunspacePoolState
from pypsrp.exceptions import FragmentError, InvalidPipelineStateError, \
InvalidPSRPOperation, InvalidRunspacePoolStateError, WSManFaultError
from pypsrp.messages import ConnectRunspacePool, CreatePipeline, Destination, \
EndOfPipelineInput, GetAvailableRunspaces, GetCommandMetadata, \
InitRunspacePool, Message, MessageType, PipelineHostResponse, \
PipelineInput, PublicKey, ResetRunspaceState, RunspacePoolHostResponse, \
SessionCapability, SetMaxRunspaces, SetMinRunspaces
from pypsrp.serializer import Serializer
from pypsrp.shell import SignalCode, WinRS
from pypsrp.wsman import NAMESPACES, OptionSet, SelectorSet
from pypsrp._utils import version_equal_or_newer
if sys.version_info[0] == 2 and sys.version_info[1] < 7: # pragma: no cover
# ElementTree in Python 2.6 does not support namespaces so we need to use
# lxml instead for this version
from lxml import etree as ET
else: # pragma: no cover
import xml.etree.ElementTree as ET
log = logging.getLogger(__name__)
PROTOCOL_VERSION = "2.3"
PS_VERSION = "2.0"
SERIALIZATION_VERSION = "1.1.0.1"
DEFAULT_CONFIGURATION_NAME = "Microsoft.PowerShell"
class RunspacePool(object):
def __init__(self, connection, apartment_state=ApartmentState.UNKNOWN,
thread_options=PSThreadOptions.DEFAULT, host=None,
configuration_name=DEFAULT_CONFIGURATION_NAME, min_runspaces=1,
max_runspaces=1, session_key_timeout_ms=60000):
"""
Represents a Runspace pool on a remote host. This pool can contain
one or more running PowerShell instances.
This is meant to be a near representation of the
System.Management.Automation.Runspaces.RunspacePool .NET class
:param connection: The connection object used to send the command over
to the remote host. Right now only pypsrp.wsman.WSMan is supported
:param apartment_state: The ApartmentState enum int values that specify
the apartment state of the remote thread
:param thread_options: The ThreadOptions enum int values that specify
what type of thread of create
:param host: An implementation of pypsrp.host.PSHost that defines
the current host and what it supports
:param configuration_name: The PSRP configuration name to connect to,
by default this is Microsoft.PowerShell which opens a full
PowerShell endpoint, use this to specify the JEA configuration to
connect to
:param min_runspaces: The minimum number of runspaces that a pool can
hold
:param max_runspaces: The maximum number of runspaces that a pool can
hold
:param session_key_timeout_ms: The maximum time to wait for a session
key transfer from the server
"""
log.info("Initialising RunspacePool object for configuration %s"
% configuration_name)
# The below are defined in some way at
# https://msdn.microsoft.com/en-us/library/ee176015.aspx
self.id = str(uuid.uuid4()).upper()
self.state = RunspacePoolState.BEFORE_OPEN
self.connection = connection
resource_uri = "http://schemas.microsoft.com/powershell/%s" \
% configuration_name
self.shell = WinRS(connection, resource_uri=resource_uri, id=self.id,
input_streams='stdin pr', output_streams='stdout')
self.ci_table = {}
self.pipelines = {}
self.session_key_timeout_ms = session_key_timeout_ms
# Extra properties that are important and can control the RunspacePool
# behaviour
self.apartment_state = apartment_state
self.thread_options = thread_options
self.host = host
self.protocol_version = None
self.ps_version = None
self.serialization_version = None
self.user_events = []
self._application_private_data = None
self._min_runspaces = min_runspaces
self._max_runspaces = max_runspaces
self._serializer = Serializer()
self._fragmenter = Fragmenter(self.connection.max_payload_size,
self._serializer)
self._exchange_key = None
self._key_exchanged = False
self._new_client = False
self._ci_counter = 0
@property
def application_private_data(self):
"""
Private data to be used by applications built on top of PowerShell.
Runspace data is gathered when creating the remote runspace pool and
will be None if the runspace is not connected.
"""
return self._application_private_data
@property
def min_runspaces(self):
return self._min_runspaces
@min_runspaces.setter
def min_runspaces(self, min_runspaces):
"""
Sets the minimum number of Runspaces that the pool maintains in
anticipation of new requests.
:param min_runspaces: The minimum number of runspaces in the pool
"""
log.info("Setting minimum runspaces for pool to %d" % min_runspaces)
if self.state != RunspacePoolState.OPENED:
self._min_runspaces = min_runspaces
return
elif min_runspaces == self._min_runspaces:
return
def response_handler(response):
if not response:
raise InvalidPSRPOperation("Failed to set minimum runspaces")
return response
ci = self._ci_counter
self._ci_counter += 1
self.ci_table[ci] = response_handler
set_min_runspace = SetMinRunspaces(min_runspaces=min_runspaces, ci=ci)
data = self._fragmenter.fragment(set_min_runspace, self.id)[0]
self.shell.send('stdin', data)
while not isinstance(self.ci_table[ci], bool):
self._receive()
self._min_runspaces = min_runspaces
del self.ci_table[ci]
@property
def max_runspaces(self):
return self._max_runspaces
@max_runspaces.setter
def max_runspaces(self, max_runspaces):
"""
Sets the maximum number of Runspaces that can be active concurrently
in the pool. All requests above that number remain queued until
runspaces become available.
:param max_runspaces: The maximum number of runspaces in the pool
"""
log.info("Setting maximum runspaces for pool to %d" % max_runspaces)
if self.state != RunspacePoolState.OPENED:
self._max_runspaces = max_runspaces
return
elif max_runspaces == self._max_runspaces:
return
def response_handler(response):
if not response:
raise InvalidPSRPOperation("Failed to set maximum runspaces")
return response
ci = self._ci_counter
self._ci_counter += 1
self.ci_table[ci] = response_handler
set_max_runspace = SetMaxRunspaces(max_runspaces=max_runspaces, ci=ci)
data = self._fragmenter.fragment(set_max_runspace, self.id)[0]
self.shell.send('stdin', data)
while not isinstance(self.ci_table[ci], bool):
self._receive()
self._max_runspaces = max_runspaces
del self.ci_table[ci]
def __enter__(self):
self.open()
return self
def __exit__(self, type, value, traceback):
self.close()
def close(self):
"""
Closes the RunspacePool and cleans all the internal resources. This
will close all the runspaces in the runspacepool and release all the
operations waiting for a runspace. If the pool is already closed or
broken or closing, this will just return
"""
log.info("Closing Runspace Pool")
if self.state in [RunspacePoolState.CLOSED, RunspacePoolState.CLOSING,
RunspacePoolState.BROKEN]:
return
self.shell.close()
self.state = RunspacePoolState.CLOSED
def connect(self):
"""
Connects the runspace pool, Runspace pool must be in a disconnected
state. This only supports reconnecting to a runspace pool created by
the same client with the same SessionId value in the WSMan headers.
"""
log.info("Connecting to Runspace Pool")
if self.state == RunspacePoolState.OPENED:
return
elif self.state != RunspacePoolState.DISCONNECTED:
raise InvalidRunspacePoolStateError(
self.state, RunspacePoolState.DISCONNECTED,
"connect to a disconnected Runspace Pool"
)
if self._new_client:
log.debug("Remote Runspace Pool was created with a different "
"client, connecting as new client")
self._connect_new_client()
self._new_client = False
else:
log.debug("Remote Runspace Pool was created with the same client, "
"connecting as an existing client")
self._connect_existing_client()
def _connect_existing_client(self):
selector_set = SelectorSet()
selector_set.add_option("ShellId", self.shell.id)
self.connection.reconnect(self.shell.resource_uri,
selector_set=selector_set)
self.state = RunspacePoolState.OPENED
def _connect_new_client(self):
rsp = NAMESPACES['rsp']
session_capability = SessionCapability(PROTOCOL_VERSION, PS_VERSION,
SERIALIZATION_VERSION)
connect_runspace = ConnectRunspacePool()
data = self._fragmenter.fragment(session_capability, self.id)[0]
data += self._fragmenter.fragment(connect_runspace, self.id)[0]
connect = ET.Element("{%s}Connect" % rsp)
selectors = SelectorSet()
selectors.add_option("ShellId", self.id)
options = OptionSet()
options.add_option("protocolversion", PROTOCOL_VERSION,
{"MustComply": "true"})
open_content = ET.SubElement(connect, "connectXml",
xmlns="http://schemas.microsoft.com/"
"powershell")
open_content.text = base64.b64encode(data).decode('utf-8')
response = self.connection.connect(self.shell.resource_uri, connect,
options, selectors)
response_xml = response.find("rsp:ConnectResponse/"
"pwsh:connectResponseXml",
NAMESPACES).text
fragments = base64.b64decode(response_xml)
self._parse_responses(fragments)
self.shell.id = self.id # need to sync up the ShellID with the rs ID
self.shell._selector_set = selectors
self._receive()
def create_disconnected_power_shells(self):
"""
Creates a list of PowerShell objects that are in the Disconnected state
for all currently disconnected running commands associated with this
runspace pool.
:return: List<PowerShell>: List of disconnected PowerShell objects
"""
log.info("Getting list of disconnected PowerShells for the current "
"Runspace Pool")
return [s for s in self.pipelines.values() if
s.state == PSInvocationState.DISCONNECTED]
def disconnect(self):
"""
Disconnects the runspace pool, must be in the Opened state
"""
log.info("Disconnecting from Runspace Pool")
if self.state == RunspacePoolState.DISCONNECTED:
return
elif self.state != RunspacePoolState.OPENED:
raise InvalidRunspacePoolStateError(
self.state, RunspacePoolState.OPENED,
"disconnect a Runspace Pool"
)
disconnect = ET.Element("{%s}Disconnect" % NAMESPACES['rsp'])
selector_set = SelectorSet()
selector_set.add_option("ShellId", self.shell.id)
self.connection.disconnect(self.shell.resource_uri, disconnect,
selector_set=selector_set)
self.state = RunspacePoolState.DISCONNECTED
for pipeline in self.pipelines.values():
pipeline.state = PSInvocationState.DISCONNECTED
def get_available_runspaces(self):
"""
Retrieves the number of runspaces available at the time of calling this
method.
:return: The number of available runspaces in the pool
"""
def response_handler(response):
self._max_runspaces = response
return response
ci = self._ci_counter
self._ci_counter += 1
self.ci_table[ci] = response_handler
get_runspaces = GetAvailableRunspaces(ci=ci)
data = self._fragmenter.fragment(get_runspaces, self.id)[0]
self.shell.send('stdin', data)
avail_runspaces = None
while avail_runspaces is None:
self._receive()
if isinstance(self.ci_table[ci], int):
avail_runspaces = self.ci_table[ci]
del self.ci_table[ci]
return avail_runspaces
def get_command_metadata(self, names, command_types=CommandType.ALL,
namespace=None, arguments=None):
"""
Get's metadata of the higher layer command's. This is very similar to
running the Get-Help cmdlet's but just done on the protocol layer
instead of through a manual PowerShell pipeline.
Any wildcard of escaping of strings must conform to the MS-PSRP
standard which is defined here
https://msdn.microsoft.com/en-us/library/ee175957.aspx
:param names: A string or list of strings that specify the commands to
get the metadata for. Each string can be a wildcard instead of the
full name.
:param command_types: The complex_objects.CommandType to filter by, by
default this will be CommandType.ALL
:param namespace: A list of wildcard patterns describing the command
namespaces containing the commands that the server should return
:param arguments: A list of extra arguments passed to the higher-layer
above the PowerShell Remoting Protocol
:return: List of CommandMetadata objects returned by the server
"""
if self.state != RunspacePoolState.OPENED:
raise InvalidRunspacePoolStateError(
self.state, RunspacePoolState.OPENED,
"get command metadata"
)
if not isinstance(names, list):
names = [names]
get_msg = GetCommandMetadata(names, command_types, namespace,
arguments)
ps = PowerShell(self)
ps._invoke(get_msg)
output = ps.end_invoke()
# first output obj is the MetadataCount obj that tells us how many
# CommandMetadata objects there are
_ = output.pop(0)
# because the main type is generic the serializer will output a
# GenericComplexObject, we will just manually serialize them to the
# CommandMetadata object
meta = ObjectMeta("Obj", object=CommandMetadata)
return [self._serializer.deserialize(o._xml, meta) for o in output]
@staticmethod
def get_runspace_pools(connection):
"""
Queries the server for disconnected runspace pools and creates a list
of runspace pool objects associated with each disconnected runspace
pool on the server. Each runspace pool object in the returned array is
in the Disconnected state and can be connected to the server by calling
the connect() method on the runspace pool.
:param connection: The connection object used to query the remote
server for a list of Runspace Pools. Currently only
pypsrp.wsman.WSMan is supported.
:return: List<RunspacePool> objects each in the Disconnected state
"""
log.info("Getting list of Runspace Pools on remote host")
wsen = NAMESPACES['wsen']
wsmn = NAMESPACES['wsman']
enum_msg = ET.Element("{%s}Enumerate" % wsen)
ET.SubElement(enum_msg, "{%s}OptimizeEnumeration" % wsmn)
ET.SubElement(enum_msg, "{%s}MaxElements" % wsmn).text = "32000"
# TODO: support wsman:EndOfSequence
response = connection.enumerate("http://schemas.microsoft.com/wbem/"
"wsman/1/windows/shell", enum_msg)
shells = response.findall("wsen:EnumerateResponse/"
"wsman:Items/"
"rsp:Shell", NAMESPACES)
runspace_pools = []
for shell in shells:
shell_id = shell.find("rsp:ShellId", NAMESPACES).text
pool = RunspacePool(connection)
pool.id = shell_id
pool.shell.shell_id = shell_id
pool.shell.opened = True
pool._new_client = True
# Seems like the server sends all pools not just disconnected but
# the .NET API always sets the state to Disconnected when callling
# GetRunspacePools so we replicate that here
pool.state = RunspacePoolState.DISCONNECTED
enum_msg = ET.Element("{%s}Enumerate" % wsen)
ET.SubElement(enum_msg, "{%s}OptimizeEnumeration" % wsmn)
ET.SubElement(enum_msg, "{%s}MaxElements" % wsmn).text = "32000"
filter = ET.SubElement(enum_msg, "{%s}Filter" % wsmn,
Dialect="http://schemas.dmtf.org/wbem/wsman"
"/1/wsman/SelectorFilter")
selector_set = SelectorSet()
selector_set.add_option("ShellId", shell_id)
filter.append(selector_set.pack())
resp = connection.enumerate("http://schemas.microsoft.com/wbem/"
"wsman/1/windows/shell/Command",
enum_msg)
commands = resp.findall("wsen:EnumerateResponse/wsman:Items/"
"rsp:Command", NAMESPACES)
pipelines = {}
for command in commands:
command_id = command.find("rsp:CommandId", NAMESPACES).text
powershell = PowerShell(pool)
powershell.id = command_id
powershell._command_id = command_id
powershell.state = PSInvocationState.DISCONNECTED
pipelines[powershell.id] = powershell
pool.pipelines = pipelines
runspace_pools.append(pool)
return runspace_pools
def open(self, application_arguments=None):
"""
Opens the runspace pool, this step must be called before it can be
used.
:param application_arguments: A dictionary of variables to set for the
runspace host. These can then be accessed in a PowerShell instance
of the runspace with $PSSenderInfo.ApplicationArguments
"""
log.info("Openning a new Runspace Pool on remote host")
if self.state == RunspacePoolState.OPENED:
return
if self.state != RunspacePoolState.BEFORE_OPEN:
raise InvalidRunspacePoolStateError(
self.state, RunspacePoolState.BEFORE_OPEN,
"open a new Runspace Pool"
)
session_capability = SessionCapability(PROTOCOL_VERSION, PS_VERSION,
SERIALIZATION_VERSION)
init_runspace_pool = InitRunspacePool(
self.min_runspaces, self.max_runspaces,
PSThreadOptions(value=self.thread_options),
ApartmentState(value=self.apartment_state),
HostInfo(host=self.host),
application_arguments
)
msgs = [session_capability, init_runspace_pool]
fragments = self._fragmenter.fragment_multiple(msgs, self.id)
open_content = ET.Element(
"creationXml", xmlns="http://schemas.microsoft.com/powershell"
)
open_content.text = base64.b64encode(fragments.pop(0)).decode('utf-8')
options = OptionSet()
options.add_option("protocolversion", PROTOCOL_VERSION,
{"MustComply": "true"})
self.shell.open(options, open_content)
self.state = RunspacePoolState.NEGOTIATION_SENT
responses = []
while self.state == RunspacePoolState.NEGOTIATION_SENT:
responses.extend(self._receive())
def exchange_keys(self):
"""
Initiate a key exchange with the server that is required when dealing
with secure strings. This can only be run once the RunspacePool is
open and if the key has already been exchanged then nothing will
happen.
"""
log.info("Starting key exchange with remote host")
if self._key_exchanged or self._exchange_key is not None:
# key is already exchanged or we are still in the processes of
# exchanging it, no need to run again
return
# Generate a unique RSA key pair for use in this Pool only
self._exchange_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend(),
)
public_numbers = self._exchange_key.public_key().public_numbers()
exponent = struct.pack("<I", public_numbers.e)
modulus = b""
for i in range(0, 256):
byte_value = struct.pack("B", public_numbers.n >> (i * 8) & 0xff)
modulus += byte_value
# the public key bytes follow a set structure defined in MS-PSRP
public_key_bytes = b"\x06\x02\x00\x00\x00\xa4\x00\x00" \
b"\x52\x53\x41\x31\x00\x08\x00\x00" + \
exponent + modulus
public_key = base64.b64encode(public_key_bytes)
msg = PublicKey(public_key=public_key.decode('utf-8'))
fragments = self._fragmenter.fragment(msg, self.id)
for fragment in fragments:
self.shell.send('stdin', fragment)
start = time.time()
while not self._key_exchanged:
elapsed = int((time.time() - start) * 1000)
if elapsed > self.session_key_timeout_ms:
raise InvalidPSRPOperation("Timeout while waiting for key "
"exchange")
self._receive()
def reset_runspace_state(self):
"""
Resets the variable table for the runspace to the default state.
This is only supported for the protocol version 2.3 and above (Server
2016/Windows 10+)
"""
log.info("Resetting remote Runspace Pool state")
if self.state == RunspacePoolState.BEFORE_OPEN:
# no need to reset if the runspace has not been opened
return
elif self.state != RunspacePoolState.OPENED:
raise InvalidRunspacePoolStateError(
self.state,
[RunspacePoolState.BEFORE_OPEN, RunspacePoolState.OPENED],
"reset RunspacePool state"
)
elif not version_equal_or_newer(self.protocol_version, "2.3"):
raise InvalidPSRPOperation("Cannot reset runspace state on "
"protocol versions older than 2.3, "
"actual: %s" % self.protocol_version)
def response_handler(response):
if not response:
raise InvalidPSRPOperation("Failed to reset runspace state")
return response
ci = self._ci_counter
self._ci_counter += 1
self.ci_table[ci] = response_handler
reset_state = ResetRunspaceState(ci=ci)
data = self._fragmenter.fragment(reset_state, self.id)[0]
self.shell.send('stdin', data)
while not isinstance(self.ci_table[ci], bool):
self._receive()
del self.ci_table[ci]
def serialize(self, obj, metadata=None):
"""
Serialize a Python object to PSRP object. This can try to automatically
serialize based on the Python type to the closest PSRP object but
manual coercion can be done with the metadata parameter.
:param obj: The Python object to serialize
:param metadata: complex_objects.ObjectMeta that defines the type of
object to serialize to, if omitted the obj will be serialized based
on the Python type
:return: An XML element that can be used as part of the PSRP input
elements like cmdlet parameters
"""
return self._serializer.serialize(obj, metadata=metadata)
def _receive(self, id=None, timeout=None):
"""
Sends a Receive WSMV request to the host and processes the messages
that are received from the host (if there are any).
:param id: If the receive is targeted to a Pipeline then this should be
the ID of that pipeline, if None then the receive is targeted to
the RunspacePool
:param timeout: An override that specifies the operation timeout for
the receive command
:return: List of tuples where each tuple is a tuple of
MessageType: The Message ID of the response
Response: The return object of the response handler function for
the message type
"""
command_id = None
pipeline = self.pipelines.get(id)
if pipeline is not None:
command_id = pipeline._command_id
response = self.shell.receive("stdout", command_id=command_id,
timeout=timeout)[2]['stdout']
return self._parse_responses(response, pipeline)
def _parse_responses(self, responses, pipeline=None):
messages = self._fragmenter.defragment(responses)
response_functions = {
# While the docs say we should verify, they are out of date with
# the possible responses and so we will just ignore for now
MessageType.SESSION_CAPABILITY: self._process_session_capability,
MessageType.ENCRYPTED_SESSION_KEY:
self._process_encrypted_session_key,
MessageType.PUBLIC_KEY_REQUEST: self.exchange_keys,
MessageType.RUNSPACEPOOL_INIT_DATA:
self._process_runspacepool_init_data,
MessageType.RUNSPACE_AVAILABILITY:
self._process_runspacepool_availability,
MessageType.RUNSPACEPOOL_STATE: self._process_runspacepool_state,
MessageType.USER_EVENT: self._process_user_event,
MessageType.APPLICATION_PRIVATE_DATA:
self._process_application_private_data,
MessageType.RUNSPACEPOOL_HOST_CALL:
self._process_runspacepool_host_call,
}
if pipeline is not None:
pipeline_response_functions = {
# The Pipeline Output isn't processes and just returned back to
# the receive caller
MessageType.PIPELINE_OUTPUT: None,
MessageType.ERROR_RECORD: pipeline._process_error_record,
MessageType.PIPELINE_STATE: pipeline._process_pipeline_state,
MessageType.DEBUG_RECORD: pipeline._process_debug_record,
MessageType.VERBOSE_RECORD: pipeline._process_verbose_record,
MessageType.WARNING_RECORD: pipeline._process_warning_record,
MessageType.PROGRESS_RECORD: pipeline._process_progress_record,
MessageType.INFORMATION_RECORD:
pipeline._process_information_record,
MessageType.PIPELINE_HOST_CALL:
pipeline._process_pipeline_host_call,
}
response_functions.update(pipeline_response_functions)
return_values = []
for message in messages:
response_function = response_functions[message.message_type]
if response_function is not None:
return_value = response_function(message)
return_values.append((message.message_type, return_value))
else:
return_values.append((message.message_type, message))
return return_values
def _process_host_call(self, message, response_obj, pipeline=None):
if self.host is None:
log.warning("Cannot run host call as no host was defined for the "
"runspace, method: %s, args: %s"
% (str(message.data.mi), str(message.data.mp)))
return message.data
response = self.host.run_method(message.data.mi, message.data.mp, self,
pipeline)
if response is not None:
msg = response_obj()
msg.ci = message.data.ci
msg.mi = message.data.mi
msg.mr = response
pid = pipeline.id if pipeline is not None else None
fragments = self._fragmenter.fragment(msg, self.id, pid)
for fragment in fragments:
self.shell.send('pr', fragment)
return message.data
def _process_session_capability(self, message):
log.debug("Received SessionCapability with protocol version: "
"%s, ps version: %s, serialization version: %s"
% (message.data.protocol_version, message.data.ps_version,
message.data.serialization_version))
self.protocol_version = message.data.protocol_version
self.ps_version = message.data.ps_version
self.serialization_version = message.data.serialization_version
# if protocol_version >= 2.2 and the max_envelope_size is still the
# default, update the envelope size to 500KiB
if version_equal_or_newer(self.protocol_version, "2.2") and \
self.connection.max_envelope_size == 153600:
self.connection.update_max_payload_size(512000)
self._fragmenter.max_size = self.connection.max_payload_size
def _process_runspacepool_init_data(self, message):
log.debug("Received RunspacePoolInitData with min runspaces: %d and "
"max runspaces: %d" % (message.data.min_runspaces,
message.data.max_runspaces))
self._min_runspaces = message.data.min_runspaces
self._max_runspaces = message.data.max_runspaces
def _process_runspacepool_availability(self, message):
ci = message.data.ci
response = message.data.response
ci_handler = self.ci_table[ci]
response = ci_handler(response)
self.ci_table[ci] = response
return response
def _process_runspacepool_host_call(self, message):
return self._process_host_call(message, RunspacePoolHostResponse)
def _process_runspacepool_state(self, message):
log.debug("Received RunspacePoolState with state: %d"
% message.data.state)
self.state = message.data.state
if self.state == RunspacePoolState.BROKEN:
raise InvalidPSRPOperation(
"Received a broken RunspacePoolState message: %s"
% str(message.data.error_record)
)
return message.data
def _process_application_private_data(self, message):
self._application_private_data = message.data
def _process_encrypted_session_key(self, message):
log.debug("Received EncryptedSessionKey response")
enc_sess_key = base64.b64decode(message.data.session_key)
# strip off Win32 Crypto Blob Header and reverse the bytes
encrypted_key = enc_sess_key[12:][::-1]
pad_method = padding.PKCS1v15()
decrypted_key = self._exchange_key.decrypt(encrypted_key, pad_method)
iv = b"\x00" * 16 # PSRP doesn't use an IV
algorithm = algorithms.AES(decrypted_key)
mode = modes.CBC(iv)
cipher = Cipher(algorithm, mode, default_backend())
self._serializer.cipher = cipher
self._key_exchanged = True
self._exchange_key = None
def _process_user_event(self, message):
self.user_events.append(message.data)
class PowerShell(object):
def __init__(self, runspace_pool):
"""
Represents a PowerShell command or script to execute against a
RunspacePool.
This is meant to be a near representation of the
System.Management.Automation.PowerShell .NET class
:param runspace_pool: The RunspacePool that the PowerShell instance
will run over
"""
log.info("Initialising PowerShell in remote Runspace Pool")
self.runspace_pool = runspace_pool
self.state = PSInvocationState.NOT_STARTED
self.commands = []
self._current_command = None
self.had_errors = False
self.history_string = None
self.id = str(uuid.uuid4()).upper()
self.is_nested = False
self.streams = PSDataStreams()
self.output = []
self._from_disconnect = False
# this is not necessarily the same ID as id, this relates to the WSMan
# CommandID that is created and we need to reference in the WSMan msgs
self._command_id = None
runspace_pool.pipelines[self.id] = self
def add_argument(self, value):
"""
Adds an argument to the last added command.
:param value: The argument to add. If the value is a native Python
type then it will be automatically serialized, otherwise if it is
an already serialized object then that value will be used instead
:return: The current PowerShell object with the argument added to the
last added Command
"""
command_parameter = CommandParameter(value=value)
self._current_command.args.append(command_parameter)
return self
def add_command(self, command):
"""
Add a Command object to the current command pipeline.
:param command: Command to add
:return: The current PowerShell object with the Command added
"""
self.commands.append(command)
self._current_command = command
return self
def add_cmdlet(self, cmdlet, use_local_scope=None):
"""
Add a cmdlet/command to the current command pipeline. This is similar
to add_command but it takes in a string and constructs the Command
object for you. For example to construct "Get-Process | Sort-Object"
.add_cmdlet("Get-Process").add_cmdlet("Sort-Object")
:param cmdlet: A string representing the cmdlet to add
:param use_local_scope: Run the cmdlet under the local scope
:return: The current PowerShell object with the cmdlet added
"""
command = Command(protocol_version=self.runspace_pool.protocol_version,
cmd=cmdlet, is_script=False,
use_local_scope=use_local_scope)
self.commands.append(command)
self._current_command = command
return self
def add_parameter(self, parameter_name, value=None):
"""
Add a parameter to the last added command. For example to construct a
command string "get-service -name service-name"
.add_command("get-service").add_parameter("name", "service-name")
:param parameter_name: The name of the parameter
:param value: The value for the parameter, None means no value is set.
If the value is a native Python type then it will be automatically
serialized, otherwise if it is an already serialized object then
that value will be used instead
:return: the current PowerShell instance with the parameter added
"""
command_parameter = CommandParameter(name=parameter_name, value=value)
self._current_command.args.append(command_parameter)
return self
def add_parameters(self, parameters):
"""
Adds a set of parameters to the last added command.
:param parameters: A dictionary of parameters where the key is the
parameter name and the value is the parameter value. A value of
None means no value is set and the parameter is a switch
:return: the current PowerShell instance with the parameters added
"""
for parameter_name, value in parameters.items():
self.add_parameter(parameter_name, value)
return self
def add_script(self, script, use_local_scope=None):
"""
Add a piece of script to construct a command pipeline.
:param script: A string representing a script
:param use_local_scope: Run the script under the local scope
:return: the current PowerShell instance with the command added
"""
command = Command(protocol_version=self.runspace_pool.protocol_version,
cmd=script, is_script=True,
use_local_scope=use_local_scope)
self.commands.append(command)
self._current_command = command
return self
def add_statement(self):
"""
Set's the last command in the pipeline to be the last in that
statement/pipeline so the next command is in a new statement.
:return: The current PowerShell instance with the last command set
as the last one in that statement
"""
self._current_command.end_of_statement = True
self._current_command = None
return self
def clear_commands(self):
"""
Clears all the commands of the current PowerShell object.
:return: The current PowerShell instance with all the commands cleared
"""
self._current_command = None
self.commands = []
return self
def connect(self):
"""
Connects to a running command on a remote server, waits until the
command is finished and returns the output objects.
:return: Command output as a PSDataCollection
"""
self.connect_async()
return self.end_invoke()
def connect_async(self):
"""
Connects to a running command on a remote server, this method will
connect to the host but will not wait until the command is finished.
Call end_invoke() to wait until the process is complete.
"""
if self.state != PSInvocationState.DISCONNECTED:
raise InvalidPipelineStateError(
self.state, PSInvocationState.DISCONNECTED,
"connect to a disconnected pipeline"
)
rsp = NAMESPACES['rsp']
connect = ET.Element("{%s}Connect" % rsp, CommandId=self.id)
self.runspace_pool.connection.connect(
self.runspace_pool.shell.resource_uri, connect,
selector_set=self.runspace_pool.shell._selector_set
)
self.state = PSInvocationState.RUNNING
self._from_disconnect = True
def create_nested_power_shell(self):
"""
Creates a nested PowerShell within the current instance. Nested
PowerShell is used to do simple operations like checking state of a
variable while another command is using the runspace.
Nested PowerShell should be invoked from the same thread as the parent
PowerShell invocation thread. So effectively the parent PowerShell
invocation thread is blocked until the nested invoke() operation is
complete.
:return: The new nested PowerShell object
"""
if self.state != PSInvocationState.RUNNING:
raise InvalidPipelineStateError(
self.state, PSInvocationState.RUNNING,
"create a nested PowerShell pipeline"
)
elif self._from_disconnect:
raise InvalidPSRPOperation("Cannot created a nested PowerShell "
"pipeline from an existing pipeline "
"that was connected to remotely")
ps = PowerShell(self.runspace_pool)
ps.is_nested = True
return ps
def begin_invoke(
self, input=None, add_to_history=False, apartment_state=None,
redirect_shell_error_to_out=False,
remote_stream_options=RemoteStreamOptions.ADD_INVOCATION_INFO):
"""
Invoke the command asynchronously, use end_invoke to get the output
collection of return objects.
:param input: List of inputs to the command, this will be manually
serialized but can also be a result of runspace_pool.serialize()
:param add_to_history: Add the commands run to the pool history
:param apartment_state: Override the RunspacePool apartment state with
one just for this invocation
:param redirect_shell_error_to_out: Whether to redirect the global
error output pipe to the commands error output pipe.