gem-hunter
Language: Python
a lightweight, security focused, BDD test framework against terraform.
terraform-compliance is a lightweight, security and compliance focused test framework against terraform to enable negative testing capability for your infrastructure-as-code.
pip or run it via docker. See InstallationIf terraform-compliance is not running quickly enough make sure to check the optional faster_parsing pip install flag in the Installation Guide
terraform-compliance mainly focuses on negative testing instead
of having fully-fledged functional tests that are mostly used for
proving a component of code is performing properly.
Fortunately, terraform is a marvellous abstraction layer for any API
that creates/updates/destroys entities. terraform also provides the
capability
to ensure everything is up-to-date between the local configuration and the remote API(s) responses.
Given the fact, terraform is used mostly against Cloud APIs, what was missing is to ensure
your code against your infrastructure must follow specific policies. Currently HashiCorp provides
Sentinel for Enterprise Products. terraform-compliance is providing a
similar functionality only for terraform while it is free-to-use and it is Open Source.
E.g. a sample policy could be, if you are working with AWS, you should not create an S3 bucket,
without having any encryption. Of course, this is just an example which may or not be applicable
for your case.
terraform-compliance provides a test framework to create these policies that will be executed against
your terraform plan in a context where both
developers and security teams can understand easily while reading it, by applying Behaviour Driven
Development Principles.
As returning back to the example, our example defined above will be translated into a BDD Feature and Scenario, as also seen in below ;
if you are working with AWS, you should not create an S3 bucket, without having any encryption
translates into ;
Given I have AWS S3 Bucket defined Then it must contain server_side_encryption_configuration
server_side_encryption_configuration is coming from the terraform code, as shown below ;
resource "aws_s3_bucket" "b" {
bucket = "my-bucket"
acl = "private"
server_side_encryption_configuration {
rule {
apply_server_side_encryption_by_default {
kms_master_key_id = "${aws_kms_key.mykey.arn}"
sse_algorithm = "aws:kms"
}
}
}
}
This policy ( Scenario ) will allow all S3 buckets newly created or updated must have encryption configuration set within the code. In an ideal way, this Scenario (among with all other Scenarios) will run on a CI/CD pipeline that will ensure that nothing is deployed by violating your policies.
See Examples for more sample use cases.
Regarding the feature file format - radish is used to parse files with extension .feature - https://radish.readthedocs.io/en/stable/tutorial.html
