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context.py
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context.py
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from botocore.exceptions import (
ClientError,
EndpointConnectionError,
NoCredentialsError,
ParamValidationError,
)
import lib.context.resources
from lib.AwsHelpers import assume_role, get_account_id, get_boto3_client
from lib.config.resources import MetaHubResourcesConfig
class Context:
def __init__(
self,
logger,
finding,
mh_filters_config,
mh_filters_tags,
mh_role,
cached_associated_resources,
):
self.logger = logger
self.parse_finding(finding)
self.get_session(mh_role)
self.mh_filters_config = mh_filters_config
self.mh_filters_tags = mh_filters_tags
self.cached_associated_resources = cached_associated_resources
# Move to Config:
self.drilled_down = True
def parse_finding(self, finding):
self.finding = finding
self.resource_account_id = finding["AwsAccountId"]
self.resource_type = finding["Resources"][0]["Type"]
self.resource_arn = finding["Resources"][0]["Id"]
try:
self.resource_region = finding["Region"]
except KeyError:
self.resource_region = finding["Resources"][0]["Region"]
self.current_account_id = get_account_id(self.logger)
def get_session(self, mh_role):
if mh_role:
self.sess = assume_role(self.logger, self.resource_account_id, mh_role)
else:
self.sess = None
def get_handler(self):
try:
hndl = getattr(lib.context.resources, self.resource_type).Metacheck(
self.logger, self.finding, self.mh_filters_config, self.sess
)
except (AttributeError, Exception) as err:
if "has no attribute '" + self.resource_type in str(err):
self.logger.info(
"get_handler undefined resource type - %s (%s)",
self.resource_arn,
self.resource_type,
)
elif "should return None" in str(err):
self.logger.info(
"get_handler resource not found - %s (%s)",
self.resource_arn,
self.resource_type,
)
else:
self.logger.error(
"get_handler error: %s - %s (%s)",
err,
self.resource_arn,
self.resource_type,
)
hndl = None
return hndl
def get_context_config(self):
self.logger.info(
"Running Get Context Config for Resource: %s (%s)",
self.resource_arn,
self.resource_type,
)
# Default Returns
# If there are no filters, we forced to return True as we expected a Match always
resource_matched = False if self.mh_filters_config else True
resource_config = False
# If the resources lives in another account, we need the --mh-assume-role
if self.resource_account_id != self.current_account_id and not self.sess:
self.logger.warning(
"get_context_config resource %s lives in AWS Account %s, but you are logged in to AWS Account %s and not --mh-assume-role was provided. Ignoring...",
self.resource_arn,
self.resource_account_id,
self.current_account_id,
)
return resource_config, resource_matched
# Get Handler
hnld = self.get_handler()
if not hnld:
return resource_config, resource_matched
# Execute Drilled
if self.drilled_down:
try:
hnld.execute_drilled_metachecks(self.cached_associated_resources)
except (AttributeError, Exception) as err:
if "should return None" in str(err):
self.logger.info(
"Drilled get_handler resource not found - %s (%s)",
self.resource_arn,
self.resource_type,
)
else:
self.logger.error(
"execute_drilled_metachecks error: %s - %s (%s)",
err,
self.resource_arn,
self.resource_type,
)
# Execute Config Context
try:
resource_config, resource_matched = hnld.output_checks()
self.logger.debug(
"Config Result for Resource: %s (%s): \nConfig: %s \nMatched: %s",
self.resource_arn,
self.resource_type,
resource_config,
resource_matched,
)
except (AttributeError, Exception) as err:
self.logger.error(
"output_checks error: %s - %s (%s)",
self.resource_type,
self.resource_arn,
err,
)
return resource_config, resource_matched
def get_context_tags(self):
self.logger.info(
"Running Get Context Tags for Resource: %s (%s)",
self.resource_arn,
self.resource_type,
)
# Default Returns
# If there are no filters, we forced to return True as we expected a Match always
resource_matched = False if self.mh_filters_tags else True
resource_tags = {}
# Non-Taggable Resources
if self.resource_type in (
"AwsAccount",
"Other",
"AwsIamAccessKey",
"AwsLogsLogGroup",
):
return resource_tags, resource_matched
# Execute Tags
tags = False
client = get_boto3_client(
self.logger, "resourcegroupstaggingapi", self.resource_region, self.sess
)
try:
response = client.get_resources(
ResourceARNList=[
self.resource_arn,
]
)
try:
tags = response["ResourceTagMappingList"][0]["Tags"]
except IndexError:
self.logger.info(
"No Tags found for resource: %s (%s)",
self.resource_arn,
self.resource_type,
)
except (ClientError, ParamValidationError, Exception) as err:
self.logger.warning(
"Error Fetching Tags for resource %s (%s) - %s",
self.resource_arn,
self.resource_type,
err,
)
if tags:
for tag in tags:
resource_tags.update({(tag["Key"]): tag["Value"]})
if self.mh_filters_tags:
# Lower Case for better matching:
mh_tags_values_lower = dict(
(k.lower(), v.lower()) for k, v in resource_tags.items()
)
mh_filters_tags_lower = dict(
(k.lower(), v.lower()) for k, v in self.mh_filters_tags.items()
)
compare = {
k: mh_tags_values_lower[k]
for k in mh_tags_values_lower
if k in mh_filters_tags_lower
and mh_tags_values_lower[k] == mh_filters_tags_lower[k]
}
self.logger.info(
"Evaluating Tags filter. Expected: "
+ str(self.mh_filters_tags)
+ " Found: "
+ str(bool(compare))
)
if bool(compare):
resource_matched = True
return resource_tags, resource_matched
def get_context_account(self):
self.logger.info(
"Running Get Context Account for Resource: %s (%s)",
self.resource_arn,
self.resource_type,
)
account_config = {
"Alias": self.get_account_alias(),
"AlternateContact": self.get_account_alternate_contact(),
"Organizations": self.get_account_organizations(),
}
return account_config
def get_account_organizations(self):
self.logger.info(
"get_account_organizations for account: %s (%s)",
self.resource_account_id,
self.resource_arn,
)
# Organizations
organizations = False
organizations_client = get_boto3_client(
self.logger, "organizations", self.resource_region, self.sess
)
try:
response = organizations_client.describe_account(
AccountId=self.resource_account_id
)
organizations_name = response["Account"]["Name"]
response = organizations_client.list_parents(
ChildId=self.resource_account_id
)
ou_id = response["Parents"][0]["Id"]
if ou_id and response["Parents"][0]["Type"] == "ORGANIZATIONAL_UNIT":
response = organizations_client.describe_organizational_unit(
OrganizationalUnitId=ou_id
)
organizations_ou = response["OrganizationalUnit"]["Name"]
elif ou_id:
organizations_ou = "ROOT"
organizations = {
"Name": organizations_name,
"OU": organizations_ou,
}
except ClientError as err:
self.logger.error(
"Failed to describe_account: %s, for resource: %s - %s",
self.resource_account_id,
self.resource_arn,
err,
)
return organizations
def get_account_alternate_contact(self, alternate_contact_type="SECURITY"):
# https://docs.aws.amazon.com/accounts/latest/reference/using-orgs-trusted-access.html
# https://aws.amazon.com/blogs/mt/programmatically-managing-alternate-contacts-on-member-accounts-with-aws-organizations/
self.logger.info(
"get_account_alternate_contact for account: %s (%s)",
self.resource_account_id,
self.resource_arn,
)
alternate_contact = ""
account_client = get_boto3_client(
self.logger, "account", "us-east-1", self.sess
)
try:
alternate_contact = account_client.get_alternate_contact(
AccountId=self.resource_account_id,
AlternateContactType=alternate_contact_type,
).get("AlternateContact")
except (NoCredentialsError, ClientError, EndpointConnectionError):
try:
alternate_contact = account_client.get_alternate_contact(
AlternateContactType=alternate_contact_type
).get("AlternateContact")
except (NoCredentialsError, ClientError, EndpointConnectionError) as err:
if err.response["Error"]["Code"] == "ResourceNotFoundException":
self.logger.info(
"No alternate contact found for account %s (%s) - %s",
self.resource_account_id,
self.resource_arn,
err,
)
else:
self.logger.warning(
"Failed to get_alternate_contact for account %s (%s) - %s",
self.resource_account_id,
self.resource_arn,
err,
)
return alternate_contact
def get_account_alias(self):
self.logger.info(
"get_account_alias for account: %s (%s)",
self.resource_account_id,
self.resource_arn,
)
aliases = ""
iam_client = get_boto3_client(self.logger, "iam", "us-east-1", self.sess)
try:
aliases = iam_client.list_account_aliases()["AccountAliases"][0]
except (NoCredentialsError, ClientError, EndpointConnectionError) as err:
self.logger.error(
"Failed to list_account_aliases: %s, for resource: %s - %s",
self.resource_account_id,
self.resource_arn,
err,
)
except IndexError as err:
self.logger.info(
"No account alias found for account %s (%s) - %s",
self.resource_account_id,
self.resource_arn,
err,
)
return aliases
def get_context_cloudtrail(self):
self.logger.info(
"Running Get Context CloudTrail for Resource: %s (%s)",
self.resource_arn,
self.resource_type,
)
client = get_boto3_client(
self.logger, "cloudtrail", self.resource_region, self.sess
)
trails = {}
try:
paginator = client.get_paginator("lookup_events")
try:
parsing_char = MetaHubResourcesConfig[self.resource_type][
"ResourceName"
]["parsing_char"]
parsing_pos = MetaHubResourcesConfig[self.resource_type][
"ResourceName"
]["parsing_pos"]
if parsing_char is not None:
ResourceName = self.resource_arn.split(parsing_char)[parsing_pos]
else:
ResourceName = self.resource_arn
event_names = MetaHubResourcesConfig[self.resource_type][
"metatrails_events"
]
except KeyError:
# No Config Defined
return False
page_iterator = paginator.paginate(
LookupAttributes=[
{"AttributeKey": "ResourceName", "AttributeValue": ResourceName}
]
)
if event_names:
for page in page_iterator:
for event in page["Events"]:
for event_name in event_names:
if event["EventName"] == event_name:
trails[event["EventName"]] = {
"Username": event["Username"],
"EventTime": str(event["EventTime"]),
"EventId": event["EventId"],
}
except (ClientError, ParamValidationError, Exception) as err:
self.logger.warning(
"Error Fetching CloudTrail for resource %s (%s) - %s",
self.resource_arn,
self.resource_type,
err,
)
return trails