100 lines
4.6 KiB
Python
100 lines
4.6 KiB
Python
import logging
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import json
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import boto3
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import botocore
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from abc import ABC
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from botocore.exceptions import ClientError
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from endgame.shared import constants
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from endgame.exposure_via_resource_policies.common import ResourceType, ResourceTypes
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from endgame.shared.policy_document import PolicyDocument
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from endgame.shared.list_resources_response import ListResourcesResponse
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from endgame.shared.response_message import ResponseMessage
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from endgame.shared.response_message import ResponseGetRbp
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logger = logging.getLogger(__name__)
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class ElasticFileSystem(ResourceType, ABC):
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def __init__(self, name: str, region: str, client: boto3.Session.client, current_account_id: str):
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self.service = "elasticfilesystem"
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self.resource_type = "file-system"
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self.region = region
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self.current_account_id = current_account_id
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self.name = name
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# Override parent defaults because EFS is weird with the resource block requirements
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self.override_resource_block = self.arn
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super().__init__(name, self.resource_type, self.service, region, client, current_account_id,
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override_resource_block=self.override_resource_block)
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@property
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def arn(self) -> str:
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# NOTE: self.name represents the File System ID
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return f"arn:aws:{self.service}:{self.region}:{self.current_account_id}:{self.resource_type}/{self.name}"
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def _get_rbp(self) -> ResponseGetRbp:
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"""Get the resource based policy for this resource and store it"""
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logger.debug("Getting resource policy for %s" % self.arn)
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try:
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response = self.client.describe_file_system_policy(FileSystemId=self.name)
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policy = json.loads(response.get("Policy"))
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success = True
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except self.client.exceptions.PolicyNotFound as error:
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policy = constants.get_empty_policy()
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success = True
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except botocore.exceptions.ClientError:
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# When there is no policy, let's return an empty policy to avoid breaking things
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policy = constants.get_empty_policy()
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success = False
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policy_document = PolicyDocument(
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policy=policy,
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service=self.service,
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override_action=self.override_action,
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include_resource_block=self.include_resource_block,
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override_resource_block=self.override_resource_block,
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override_account_id_instead_of_principal=self.override_account_id_instead_of_principal,
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)
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response = ResponseGetRbp(policy_document=policy_document, success=success)
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return response
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def set_rbp(self, evil_policy: dict) -> ResponseMessage:
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logger.debug("Setting resource policy for %s" % self.arn)
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new_policy = json.dumps(evil_policy)
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try:
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# https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/efs.html#EFS.Client.put_file_system_policy
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self.client.put_file_system_policy(FileSystemId=self.name, Policy=new_policy)
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message = "success"
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success = True
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except botocore.exceptions.ClientError as error:
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message = str(error)
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success = False
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response_message = ResponseMessage(message=message, operation="set_rbp", success=success, evil_principal="",
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victim_resource_arn=self.arn, original_policy=self.original_policy,
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updated_policy=evil_policy, resource_type=self.resource_type,
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resource_name=self.name, service=self.service)
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return response_message
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class ElasticFileSystems(ResourceTypes):
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def __init__(self, client: boto3.Session.client, current_account_id: str, region: str):
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super().__init__(client, current_account_id, region)
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self.service = "elasticfilesystem"
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self.resource_type = "file-system"
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@property
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def resources(self) -> [ListResourcesResponse]:
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"""Get a list of these resources"""
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resources = []
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paginator = self.client.get_paginator("describe_file_systems")
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page_iterator = paginator.paginate()
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for page in page_iterator:
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these_resources = page["FileSystems"]
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for resource in these_resources:
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fs_id = resource.get("FileSystemId")
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arn = resource.get("FileSystemArn")
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list_resources_response = ListResourcesResponse(
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service=self.service, account_id=self.current_account_id, arn=arn, region=self.region,
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resource_type=self.resource_type, name=fs_id)
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resources.append(list_resources_response)
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return resources
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