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test_kms.py
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# Copyright The Cloud Custodian Authors.
# SPDX-License-Identifier: Apache-2.0
import json
import time
from unittest.mock import patch
from c7n.resources.aws import shape_validate
from .common import BaseTest, functional
from c7n.config import Config
from c7n.executor import MainThreadExecutor
from c7n.filters.iamaccess import CrossAccountAccessFilter
class KMSTest(BaseTest):
def test_kms_grant(self):
session_factory = self.replay_flight_data("test_kms_grants")
p = self.load_policy(
{
"name": "kms-grant-count",
"resource": "kms",
"filters": [{"type": "grant-count"}],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual(len(resources), 0)
def test_kms_key_alias_augment(self):
session_factory = self.replay_flight_data("test_kms_key_alias")
p = self.load_policy(
{
"name": "kms-key-alias-filter",
"resource": "kms-key",
"filters": [
{
"type": "value",
"key": "AliasNames",
"op": "in",
"value": "alias/aws/dms",
"value_type": "swap"
}
],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual(len(resources), 1)
def test_key_rotation(self):
session_factory = self.replay_flight_data("test_key_rotation")
p = self.load_policy(
{
"name": "kms-key-rotation",
"resource": "kms-key",
"filters": [
{
"type": "key-rotation-status",
"key": "KeyRotationEnabled",
"value": True,
}
],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual(len(resources), 1)
def test_set_key_rotation(self):
session_factory = self.replay_flight_data("test_key_rotation_set")
p = self.load_policy(
{
"name": "enable-key-rotation",
"resource": "kms-key",
"filters": [
{"tag:Name": "CMK-Rotation-Test"},
{
"type": "key-rotation-status",
"key": "KeyRotationEnabled",
"value": False,
},
],
"actions": [{"type": "set-rotation", "state": True}],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual(len(resources), 1)
client = session_factory(region="us-east-1").client("kms")
key = client.get_key_rotation_status(KeyId=resources[0]["KeyId"])
self.assertEqual(key["KeyRotationEnabled"], True)
def test_kms_config_source(self):
session_factory = self.replay_flight_data("test_kms_config_source")
p = self.load_policy(
{
"name": "kms-config-source",
"resource": "kms-key",
"source": "config",
"query": [
{"clause": "configuration.description = 'For testing the KMS config source'"}
],
"filters": [
{"AliasNames[0]": "alias/config-source-testing"},
{"tag:ConfigTesting": "present"}
],
},
session_factory=session_factory,
config={"region": "us-east-2"}
)
resources = p.run()
self.assertEqual(len(resources), 1)
def test_kms_access_denied(self):
session_factory = self.replay_flight_data("test_kms_access_denied")
p = self.load_policy(
{
"name": "survive-access-denied",
"resource": "kms-key",
"filters": [
{"type": "value",
"key": "AliasNames[0]",
"op": "glob",
"value": "alias/test-kms*"}
],
},
session_factory=session_factory,
config={"region": "us-west-1"}
)
resources = p.run()
self.assertEqual(len(resources), 2)
# Restrictive key policies may prevent us from loading detailed
# key information, but we should always have an Arn
self.assertFalse(all('KeyState' in r for r in resources))
self.assertTrue(all('Arn' in r for r in resources))
@functional
def test_kms_remove_matched(self):
session_factory = self.replay_flight_data("test_kms_remove_matched")
sts = session_factory().client("sts")
current_user_arn = sts.get_caller_identity()["Arn"]
client = session_factory().client("kms")
key_id = client.create_key()["KeyMetadata"]["KeyId"]
self.addCleanup(
client.schedule_key_deletion, KeyId=key_id, PendingWindowInDays=7
)
client.put_key_policy(
KeyId=key_id,
PolicyName="default",
Policy=json.dumps(
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "DefaultRoot",
"Effect": "Allow",
"Principal": {"AWS": current_user_arn},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "SpecificAllow",
"Effect": "Allow",
"Principal": {"AWS": current_user_arn},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "Public",
"Effect": "Allow",
"Principal": "*",
"Action": "kms:*",
"Resource": "*",
},
],
}
),
)
self.assertStatementIds(
client, key_id, "DefaultRoot", "SpecificAllow", "Public"
)
p = self.load_policy(
{
"name": "kms-rm-matched",
"resource": "kms-key",
"filters": [
{"KeyId": key_id},
{"type": "cross-account", "whitelist": [self.account_id]},
],
"actions": [{"type": "remove-statements", "statement_ids": "matched"}],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual([r["KeyId"] for r in resources], [key_id])
if self.recording:
time.sleep(60) # takes time before new policy reflected
self.assertStatementIds(client, key_id, "DefaultRoot", "SpecificAllow")
def assertStatementIds(self, client, key_id, *expected):
p = client.get_key_policy(KeyId=key_id, PolicyName="default")["Policy"]
actual = [s["Sid"] for s in json.loads(p)["Statement"]]
self.assertEqual(actual, list(expected))
@functional
def test_kms_remove_named(self):
session_factory = self.replay_flight_data("test_kms_remove_named")
client = session_factory().client("kms")
key_id = client.create_key()["KeyMetadata"]["KeyId"]
self.addCleanup(
client.schedule_key_deletion, KeyId=key_id, PendingWindowInDays=7
)
client.put_key_policy(
KeyId=key_id,
PolicyName="default",
Policy=json.dumps(
{
"Version": "2008-10-17",
"Statement": [
{
"Sid": "DefaultRoot",
"Effect": "Allow",
"Principal": "*",
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "RemoveMe",
"Effect": "Allow",
"Principal": "*",
"Action": "kms:*",
"Resource": "*",
},
],
}
),
)
self.assertStatementIds(client, key_id, "DefaultRoot", "RemoveMe")
p = self.load_policy(
{
"name": "kms-rm-named",
"resource": "kms-key",
"filters": [{"KeyId": key_id}],
"actions": [
{"type": "remove-statements", "statement_ids": ["RemoveMe"]}
],
},
session_factory=session_factory,
)
resources = p.run()
self.assertEqual(len(resources), 1)
if self.recording:
time.sleep(60) # takes time before new policy reflected
self.assertStatementIds(client, key_id, "DefaultRoot")
class KMSTagging(BaseTest):
@functional
def test_kms_key_tag(self):
session_factory = self.replay_flight_data("test_kms_key_tag")
client = session_factory().client("kms")
key_id = client.create_key()["KeyMetadata"]["KeyId"]
self.addCleanup(
client.schedule_key_deletion, KeyId=key_id, PendingWindowInDays=7
)
policy = self.load_policy(
{
"name": "kms-key-tag",
"resource": "kms-key",
"filters": [{"KeyId": key_id}],
"actions": [
{"type": "tag", "key": "RequisiteKey", "value": "Required"}
],
},
session_factory=session_factory,
)
resources = policy.run()
self.assertEqual(len(resources), 1)
tags = client.list_resource_tags(KeyId=key_id)["Tags"]
self.assertEqual(tags[0]["TagKey"], "RequisiteKey")
@functional
def test_kms_key_remove_tag(self):
session_factory = self.replay_flight_data("test_kms_key_remove_tag")
client = session_factory().client("kms")
key_id = client.create_key(
Tags=[{"TagKey": "ExpiredTag", "TagValue": "Invalid"}]
)[
"KeyMetadata"
][
"KeyId"
]
self.addCleanup(
client.schedule_key_deletion, KeyId=key_id, PendingWindowInDays=7
)
policy = self.load_policy(
{
"name": "kms-key-remove-tag",
"resource": "kms-key",
"filters": [{"KeyState": "Enabled"}, {"tag:ExpiredTag": "Invalid"}],
"actions": [{"type": "remove-tag", "tags": ["ExpiredTag"]}],
},
session_factory=session_factory,
)
resources = policy.run()
self.assertEqual(len(resources), 1)
self.assertEqual(resources[0]["KeyId"], key_id)
tags = client.list_resource_tags(KeyId=key_id)["Tags"]
self.assertEqual(len(tags), 0)
def test_kms_key_related(self):
session_factory = self.replay_flight_data("test_kms_key_related")
key_alias = "alias/aws/sqs"
p = self.load_policy(
{
"name": "sqs-kms-key-related",
"resource": "sqs",
"source": "config",
"query": [
{"clause": "resourceName like 'test-kms%'"}
],
"filters": [
{
"type": "kms-key",
"key": "c7n:AliasName",
"value": key_alias,
"op": "eq"
}
]
},
session_factory=session_factory,
)
resources = p.run()
client = session_factory().client("kms")
self.assertEqual(len(resources), 2)
target_key = client.describe_key(KeyId=key_alias)
self.assertTrue(all(
res['KmsMasterKeyId'] in (key_alias, target_key['KeyMetadata']['Arn'])
for res in resources
))
# Whether a resource specifies a key by ID or alias, it should resolve
# to the same ID for related resource lookups.
related_ids = p.resource_manager.filters[0].get_related_ids(resources)
self.assertEqual(set(related_ids), {target_key['KeyMetadata']['KeyId']})
def test_kms_key_related_cache_lookup(self):
"""Validate that the kms-key filter can perform alias lookups
against cached keys.
See https://github.com/cloud-custodian/cloud-custodian/issues/8504
"""
session_factory = self.replay_flight_data("test_kms_key_related_cache_lookup")
key_alias = "alias/kms-cache-check"
p = self.load_policy(
{
"name": "load-keys-into-cache",
"resource": "aws.kms-key",
},
cache=True,
config=Config.empty(
cache='memory',
cache_period=10,
output_dir=self.get_temp_dir(),
),
session_factory=session_factory,
)
resources = p.run()
self.assertGreater(len(resources), 0)
p = self.load_policy(
{
"name": "sqs-kms-key-related-from-cache",
"resource": "aws.sqs",
"filters": [
{
"type": "kms-key",
"key": "c7n:AliasName",
"value": key_alias,
"op": "eq"
}
]
},
cache=True,
config=Config.empty(
cache='memory',
cache_period=10,
output_dir=self.get_temp_dir(),
),
session_factory=session_factory,
)
with patch('c7n.resources.sqs.SQS.executor_factory', MainThreadExecutor):
resources = p.run()
self.assertEqual(len(resources), 1)
def test_kms_post_finding(self):
factory = self.replay_flight_data('test_kms_post_finding')
p = self.load_policy({
'name': 'kms',
'resource': 'aws.kms',
'actions': [
{'type': 'post-finding',
'types': [
'Software and Configuration Checks/OrgStandard/abc-123']}]},
session_factory=factory, config={'region': 'us-west-2'})
resources = p.resource_manager.get_resources([
'arn:aws:kms:us-west-2:644160558196:alias/c7n-test'])
rfinding = p.resource_manager.actions[0].format_resource(
resources[0])
self.maxDiff = None
self.assertEqual(
rfinding,
{'Details': {'AwsKmsKey': {
'KeyId': '44d25a5c-7efa-44ed-8436-b9511ea921b3',
'KeyManager': 'CUSTOMER',
'KeyState': 'Enabled',
'CreationDate': 1493967398.394,
'Origin': 'AWS_KMS'}},
'Id': 'arn:aws:kms:us-west-2:644160558196:alias/44d25a5c-7efa-44ed-8436-b9511ea921b3',
'Partition': 'aws',
'Region': 'us-west-2',
'Type': 'AwsKmsKey'})
shape_validate(
rfinding['Details']['AwsKmsKey'], 'AwsKmsKeyDetails', 'securityhub')
class KMSCrossAccount(BaseTest):
def test_kms_cross_account(self):
self.patch(CrossAccountAccessFilter, "executor_factory", MainThreadExecutor)
session_factory = self.replay_flight_data("test_cross_account_kms")
client = session_factory().client("kms")
policy = {
"Id": "Lulu",
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Enable IAM User Permissions",
"Effect": "Allow",
"Principal": {"AWS": "arn:aws:iam::644160558196:root"},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "Enable Cross Account",
"Effect": "Allow",
"Principal": "*",
"Action": "kms:Encrypt",
"Resource": "*",
},
],
}
key_info = client.create_key(
Policy=json.dumps(policy), Description="test-cross-account-1"
)[
"KeyMetadata"
]
# disable and schedule deletion
self.addCleanup(
client.schedule_key_deletion, KeyId=key_info["KeyId"], PendingWindowInDays=7
)
self.addCleanup(client.disable_key, KeyId=key_info["KeyId"])
p = self.load_policy(
{
"name": "kms-cross",
"resource": "kms-key",
"filters": [{"KeyState": "Enabled"}, "cross-account"],
},
session_factory=session_factory,
config={"region": "us-east-1"}
)
resources = p.run()
self.assertEqual(len(resources), 1)
self.assertEqual(resources[0]["KeyId"], key_info["KeyId"])
def test_kms_cross_account_condition_keys_1(self):
self.patch(CrossAccountAccessFilter, "executor_factory", MainThreadExecutor)
session_factory = self.replay_flight_data(
"test_cross_account_kms_condition_keys_1", region="af-south-1")
client = session_factory().client("kms")
policy = {
"Id": "Lulu",
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Enable IAM User Permissions",
"Effect": "Allow",
"Principal": {"AWS": "arn:aws:iam::644160558196:root"},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "Good condition key",
"Effect": "Allow",
"Principal": {
"AWS": "*"
},
"Action": "kms:CreateGrant",
"Resource": "*",
"Condition": {
"StringEquals": {
"kms:CallerAccount": "644160558196"
}
}
},
],
}
key_info = client.create_key(
Policy=json.dumps(policy), Description="test-cross-account-2"
)[
"KeyMetadata"
]
# disable and schedule deletion
self.addCleanup(
client.schedule_key_deletion, KeyId=key_info["KeyId"], PendingWindowInDays=7
)
self.addCleanup(client.disable_key, KeyId=key_info["KeyId"])
p = self.load_policy(
{
"name": "kms-cross",
"resource": "kms-key",
"filters": [{"KeyState": "Enabled"}, "cross-account"],
},
session_factory=session_factory,
config={"region": "af-south-1"}
)
resources = p.run()
self.assertEqual(len(resources), 0)
def test_kms_cross_account_condition_keys_2(self):
self.patch(CrossAccountAccessFilter, "executor_factory", MainThreadExecutor)
session_factory = self.replay_flight_data(
"test_cross_account_kms_condition_keys_2", region="af-south-1")
client = session_factory().client("kms")
policy = {
"Id": "Lulu",
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Enable IAM User Permissions",
"Effect": "Allow",
"Principal": {"AWS": "arn:aws:iam::644160558196:root"},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "Good condition key",
"Effect": "Allow",
"Principal": {
"AWS": "644160558196"
},
"Action": "kms:Encrypt",
"Resource": "*",
"Condition": {
"StringEquals": {
"kms:ViaService": "s3.af-south-1.amazonaws.com",
},
"ForAllValues:StringEquals": {
"kms:GrantOperations": [
"Encrypt",
"ReEncryptTo"
]
}
}
},
],
}
key_info = client.create_key(
Policy=json.dumps(policy), Description="test-cross-account-3"
)[
"KeyMetadata"
]
# disable and schedule deletion
self.addCleanup(
client.schedule_key_deletion, KeyId=key_info["KeyId"], PendingWindowInDays=7
)
self.addCleanup(client.disable_key, KeyId=key_info["KeyId"])
p = self.load_policy(
{
"name": "kms-cross",
"resource": "kms-key",
"filters": [{"KeyState": "Enabled"}, "cross-account"],
},
session_factory=session_factory,
config={"region": "af-south-1"}
)
resources = p.run()
self.assertEqual(len(resources), 0)
def test_kms_cross_account_condition_keys_3(self):
self.patch(CrossAccountAccessFilter, "executor_factory", MainThreadExecutor)
session_factory = self.replay_flight_data(
"test_cross_account_kms_condition_keys_3", region="af-south-1")
client = session_factory().client("kms")
policy = {
"Id": "Lulu",
"Version": "2012-10-17",
"Statement": [
{
"Sid": "Enable IAM User Permissions",
"Effect": "Allow",
"Principal": {"AWS": "arn:aws:iam::644160558196:root"},
"Action": "kms:*",
"Resource": "*",
},
{
"Sid": "Bad condition key",
"Effect": "Allow",
"Principal": {
"AWS": "*"
},
"Action": "kms:Encrypt",
"Resource": "*",
"Condition": {
"StringEquals": {
"kms:ViaService": "s3.af-south-1.amazonaws.com",
"kms:CallerAccount": "*",
},
"ForAllValues:StringEquals": {
"kms:GrantOperations": [
"Encrypt"
]
}
}
},
],
}
key_info = client.create_key(
Policy=json.dumps(policy), Description="test-cross-account-4"
)[
"KeyMetadata"
]
# disable and schedule deletion
self.addCleanup(
client.schedule_key_deletion, KeyId=key_info["KeyId"], PendingWindowInDays=7
)
self.addCleanup(client.disable_key, KeyId=key_info["KeyId"])
p = self.load_policy(
{
"name": "kms-cross",
"resource": "kms-key",
"filters": [{"KeyState": "Enabled"}, "cross-account"],
},
session_factory=session_factory,
config={"region": "af-south-1"}
)
resources = p.run()
self.assertEqual(len(resources), 1)
self.assertEqual(resources[0]["KeyId"], key_info["KeyId"])