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chore(aws): improve IAM Resource Policy public logic (#5067)
Co-authored-by: Rubén De la Torre Vico <rubendltv22@gmail.com>
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Sergio GarciaandRubén De la Torre Vico authored and GitHub committed
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@@ -79,7 +79,6 @@ class Test_awslambda_function_not_publicly_accessible:
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StatementId="public-access",
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Action="lambda:InvokeFunction",
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Principal="*",
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SourceArn=function_arn,
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)
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aws_provider = set_mocked_aws_provider([AWS_REGION_EU_WEST_1])
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@@ -112,6 +111,83 @@ class Test_awslambda_function_not_publicly_accessible:
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)
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assert result[0].resource_tags == [{"tag1": "value1", "tag2": "value2"}]
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@mock_aws
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def test_function_public_with_source_account(self):
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# Create the mock IAM role
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iam_client = client("iam", region_name=AWS_REGION_EU_WEST_1)
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role_name = "test-role"
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assume_role_policy_document = {
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"Version": "2012-10-17",
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"Statement": [
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{
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"Effect": "Allow",
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"Principal": {"Service": "lambda.amazonaws.com"},
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"Action": "sts:AssumeRole",
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}
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],
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}
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role_arn = iam_client.create_role(
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RoleName=role_name,
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AssumeRolePolicyDocument=dumps(assume_role_policy_document),
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)["Role"]["Arn"]
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function_name = "test-lambda"
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# Create the lambda function using boto3 client
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lambda_client = client("lambda", region_name=AWS_REGION_EU_WEST_1)
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function_arn = lambda_client.create_function(
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FunctionName=function_name,
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Runtime="nodejs4.3",
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Role=role_arn,
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Handler="index.handler",
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Code={"ZipFile": b"fileb://file-path/to/your-deployment-package.zip"},
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Description="Test Lambda function",
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Timeout=3,
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MemorySize=128,
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Publish=True,
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Tags={"tag1": "value1", "tag2": "value2"},
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)["FunctionArn"]
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# Attach the policy to the lambda function with a wildcard principal
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lambda_client.add_permission(
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FunctionName=function_name,
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StatementId="non-public-access",
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Action="lambda:InvokeFunction",
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Principal="*",
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SourceArn=function_arn,
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SourceAccount=AWS_ACCOUNT_NUMBER,
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)
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aws_provider = set_mocked_aws_provider([AWS_REGION_EU_WEST_1])
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from prowler.providers.aws.services.awslambda.awslambda_service import Lambda
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with mock.patch(
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"prowler.providers.common.provider.Provider.get_global_provider",
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return_value=aws_provider,
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), mock.patch(
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"prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible.awslambda_client",
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new=Lambda(aws_provider),
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):
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# Test Check
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from prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible import (
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awslambda_function_not_publicly_accessible,
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)
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check = awslambda_function_not_publicly_accessible()
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result = check.execute()
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assert len(result) == 1
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assert result[0].region == AWS_REGION_EU_WEST_1
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assert result[0].resource_id == function_name
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assert result[0].resource_arn == function_arn
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assert result[0].status == "PASS"
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assert (
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result[0].status_extended
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== f"Lambda function {function_name} has a policy resource-based policy not public."
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)
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assert result[0].resource_tags == [{"tag1": "value1", "tag2": "value2"}]
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@mock_aws
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def test_function_not_public(self):
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# Create the mock IAM role
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@@ -190,6 +266,7 @@ class Test_awslambda_function_not_publicly_accessible:
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def test_function_public_with_canonical(self):
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lambda_client = mock.MagicMock
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lambda_client.audited_account = AWS_ACCOUNT_NUMBER
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function_name = "test-lambda"
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function_runtime = "nodejs4.3"
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function_arn = f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
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@@ -418,59 +495,190 @@ class Test_awslambda_function_not_publicly_accessible:
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)
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assert result[0].resource_tags == [{"tag1": "value1", "tag2": "value2"}]
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# def test_function_could_be_invoked_by_specific_aws_account(self):
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# lambda_client = mock.MagicMock
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# function_name = "test-lambda"
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# function_runtime = "nodejs4.3"
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# function_arn = f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
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# lambda_policy = { # If there is an ALB or API Gateway in specified AWS Account, the lambda function could be invoked and exposed by them
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# "Version": "2012-10-17",
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# "Statement": [
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# {
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# "Sid": "public-access",
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# "Principal": {"AWS": AWS_ACCOUNT_NUMBER},
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# "Effect": "Allow",
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# "Action": [
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# "lambda:InvokeFunction",
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# ],
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# "Resource": [function_arn],
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# }
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# ],
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# }
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def test_function_could_be_invoked_by_specific_aws_account(self):
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lambda_client = mock.MagicMock
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lambda_client.audited_account = AWS_ACCOUNT_NUMBER
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function_name = "test-lambda"
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function_runtime = "nodejs4.3"
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function_arn = f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
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lambda_policy = {
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"Version": "2012-10-17",
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"Id": "default",
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"Statement": [
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{
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"Sid": "awslambda-myLambdaScript-LambdaInvokePermission",
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"Effect": "Allow",
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"Principal": {"Service": "ses.amazonaws.com"},
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"Action": "lambda:InvokeFunction",
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"Resource": f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function:{function_name}",
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"Condition": {
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"StringEquals": {"AWS:SourceAccount": AWS_ACCOUNT_NUMBER}
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},
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}
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],
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}
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# lambda_client.functions = {
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# "function_name": Function(
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# name=function_name,
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# security_groups=[],
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# arn=function_arn,
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# region=AWS_REGION_EU_WEST_1,
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# runtime=function_runtime,
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# policy=lambda_policy,
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# )
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# }
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lambda_client.functions = {
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"function_name": Function(
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name=function_name,
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security_groups=[],
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arn=function_arn,
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region=AWS_REGION_EU_WEST_1,
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runtime=function_runtime,
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policy=lambda_policy,
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)
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}
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# with mock.patch(
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# "prowler.providers.common.provider.Provider.get_global_provider",
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# return_value=set_mocked_aws_provider(),
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# ), mock.patch(
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# "prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible.awslambda_client",
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# new=lambda_client,
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# ):
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# # Test Check
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# from prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible import (
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# awslambda_function_not_publicly_accessible,
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# )
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with mock.patch(
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"prowler.providers.common.provider.Provider.get_global_provider",
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return_value=set_mocked_aws_provider(),
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), mock.patch(
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"prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible.awslambda_client",
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new=lambda_client,
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):
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from prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible import (
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awslambda_function_not_publicly_accessible,
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)
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# check = awslambda_function_not_publicly_accessible()
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# result = check.execute()
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check = awslambda_function_not_publicly_accessible()
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result = check.execute()
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# assert len(result) == 1
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# assert result[0].region == AWS_REGION_EU_WEST_1
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# assert result[0].resource_id == function_name
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# assert result[0].resource_arn == function_arn
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# assert result[0].status == "FAIL"
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# assert (
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# result[0].status_extended
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# == f"Lambda function {function_name} has a policy resource-based policy with public access."
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# )
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# assert result[0].resource_tags == []
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assert len(result) == 1
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assert result[0].region == AWS_REGION_EU_WEST_1
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assert result[0].resource_id == function_name
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assert result[0].resource_arn == function_arn
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assert result[0].status == "PASS"
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assert (
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result[0].status_extended
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== f"Lambda function {function_name} has a policy resource-based policy not public."
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)
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assert result[0].resource_tags == []
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def test_function_could_be_invoked_by_specific_other_aws_account(self):
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lambda_client = mock.MagicMock
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lambda_client.audited_account = AWS_ACCOUNT_NUMBER
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function_name = "test-lambda"
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function_runtime = "nodejs4.3"
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function_arn = f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
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lambda_policy = {
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"Version": "2012-10-17",
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"Id": "default",
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"Statement": [
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{
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"Sid": "awslambda-myLambdaScript-LambdaInvokePermission",
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"Effect": "Allow",
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"Principal": {"Service": "ses.amazonaws.com"},
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"Action": "lambda:InvokeFunction",
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"Resource": f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function:{function_name}",
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"Condition": {
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"StringEquals": {"AWS:SourceAccount": "000000000000"}
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},
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}
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],
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}
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lambda_client.functions = {
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"function_name": Function(
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name=function_name,
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security_groups=[],
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arn=function_arn,
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region=AWS_REGION_EU_WEST_1,
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runtime=function_runtime,
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policy=lambda_policy,
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)
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}
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with mock.patch(
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"prowler.providers.common.provider.Provider.get_global_provider",
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return_value=set_mocked_aws_provider(),
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), mock.patch(
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"prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible.awslambda_client",
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new=lambda_client,
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):
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from prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible import (
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awslambda_function_not_publicly_accessible,
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)
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check = awslambda_function_not_publicly_accessible()
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result = check.execute()
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assert len(result) == 1
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assert result[0].region == AWS_REGION_EU_WEST_1
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assert result[0].resource_id == function_name
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assert result[0].resource_arn == function_arn
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assert result[0].status == "PASS"
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assert (
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result[0].status_extended
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== f"Lambda function {function_name} has a policy resource-based policy not public."
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)
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assert result[0].resource_tags == []
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def test_function_public_policy_with_several_statements(self):
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lambda_client = mock.MagicMock
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lambda_client.audited_account = AWS_ACCOUNT_NUMBER
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function_name = "test-lambda"
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function_runtime = "nodejs4.3"
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function_arn = f"arn:aws:lambda:{AWS_REGION_EU_WEST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
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lambda_policy = {
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"Version": "2012-10-17",
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"Id": "default",
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"Statement": [
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{
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"Sid": "AllowExecutionFromAPIGateway",
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"Effect": "Allow",
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"Principal": {"Service": "apigateway.amazonaws.com"},
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"Action": "lambda:InvokeFunction",
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"Resource": f"arn:aws:lambda:eu-central-1:{AWS_ACCOUNT_NUMBER}:function:foo",
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"Condition": {
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"ArnLike": {
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"AWS:SourceArn": f"arn:aws:execute-api:eu-central-1:{AWS_ACCOUNT_NUMBER}:bar/*/GET/proxy+"
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}
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},
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},
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{
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"Sid": "FunctionURLAllowPublicAccess",
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"Effect": "Allow",
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"Principal": "*",
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"Action": "lambda:InvokeFunctionUrl",
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"Resource": f"arn:aws:lambda:eu-central-1:{AWS_ACCOUNT_NUMBER}:function:foo",
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"Condition": {
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"StringEquals": {"lambda:FunctionUrlAuthType": "NONE"}
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},
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},
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],
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}
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lambda_client.functions = {
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"function_name": Function(
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name=function_name,
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security_groups=[],
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arn=function_arn,
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region=AWS_REGION_EU_WEST_1,
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runtime=function_runtime,
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policy=lambda_policy,
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)
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}
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with mock.patch(
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"prowler.providers.common.provider.Provider.get_global_provider",
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return_value=set_mocked_aws_provider(),
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), mock.patch(
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"prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible.awslambda_client",
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new=lambda_client,
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):
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from prowler.providers.aws.services.awslambda.awslambda_function_not_publicly_accessible.awslambda_function_not_publicly_accessible import (
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awslambda_function_not_publicly_accessible,
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)
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check = awslambda_function_not_publicly_accessible()
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result = check.execute()
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assert len(result) == 1
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assert result[0].status == "FAIL"
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assert (
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result[0].status_extended
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== f"Lambda function {function_name} has a policy resource-based policy with public access."
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)
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assert result[0].resource_id == function_name
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assert result[0].resource_arn == function_arn
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assert result[0].region == AWS_REGION_EU_WEST_1
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