pay-aws-compliance

The GOV.UK Pay AWS compliance report

What is it?

pay-aws-compliance is a Python script which runs against an AWS account and checks for things that fail compliance in some way.

The script can be run independently with

./aws_compliance.py -h # Help message
./aws_compliance.py -e # Dry-run: echo variables
./aws_compliance.py    # Run the reports

or as part of a scheduled Lambda function, or by AWS Config.

Controls

control_id	description
s3_versioning_enabled	Checks all buckets in an S3 account for bucket versioning being enabled
3_logging_enabled	Checks all buckets in an S3 account for bucket logging being enabled
vuls_reports	Scans nightly generated Vuls reports and alerts if CVE found
reboots_required	pay-reboots-required runs and updates the instance `reboot_required` tag nightly. This control checks for instance tags of `reboots_required: true`

Environment Variables

Varible	Default	Purpose
AWS_DEFAULT_REGION	eu-west-1	AWS Region API client connects to
SEND_REPORT_TO_SNS	false	If should send report to SNS
SNS_TOPIC_ARN	None	SNS topic ARN to send report to
ONLY_SHOW_FAILED	false	Only show failed compliance checks
S3_BUCKETS_TO_SKIP	None	CSV of S3 buckets to skip compliance checks
VULS_REPORT_BUCKET	pay-govuk-dev-vuls	S3 bucket to find Vuls reports
UNIX_ACCOUNT_REPORT_BUCKET	pay-govuk-unix-accounts-dev	S3 bucket where unix account reports are stored

Interpreting the compliance report

Interpreting the compliance report should be pretty straight forward:

python aws_compliance.py
[
    {
        "Description": "Ensure S3 versioning is enabled on all buckets",
        "ScoredControl": false,
        "failReason": "",
        "Result": true,
        "Offenders": [],
        "ControlId": "s3_versioning_enabled"
    },
    {
        "Description": "Ensure S3 logging is enabled on all buckets",
        "ScoredControl": false,
        "failReason": "",
        "Result": true,
        "Offenders": [],
        "ControlId": "s3_logging_enabled"
    }
]

The above shows output for an AWS account which is not in violation of any of the compliance controls.

python aws_compliance.py
[
    {
        "Description": "Ensure S3 versioning is enabled on all buckets",
        "ScoredControl": false,
        "failReason": "Buckets found without versioning enabled",
        "Result": false,
        "Offenders": [
            "pay-test-foo-bar-bucket"
        ],
        "ControlId": "s3_versioning_enabled"
    },
    {
        "Description": "Ensure S3 logging is enabled on all buckets",
        "ScoredControl": false,
        "failReason": "Buckets found without logging enabled",
        "Result": false,
        "Offenders": [
            "pay-test-foo-bar-bucket"
            "pay-test-foo-bar-badger-bucket"
        ],
        "ControlId": "s3_logging_enabled"
    },
    {
        "Description": "Vuls reports",
        "ScoredControl": false,
        "failReason": {
            "CVE-2017-7484": {
                "instances": [
                    "badger-12-egress-proxy-i-111111111111",
                    "foo-12-egress-proxy-i-999999999999"
                ],
                "score": 5,
                "severity": "high"
            },
            "CVE-2017-7485": {
                "instances": [
                    "badger-12-egress-proxy-i-111111111111",
                    "foo-12-egress-proxy-i-999999999999"
                ],
                "score": 4.3,
                "severity": "high"
            },
            "CVE-2017-7486": {
                "instances": [
                    "badger-12-egress-proxy-i-111111111111",
                    "foo-12-egress-proxy-i-999999999999"
                ],
                "score": 5,
                "severity": "high"
            }
        },
        "Result": false,
        "Offenders": [
            "dev-josh-23"
        ],
        "ControlId": "vuls_reports"
    }
]

The above shows output for an AWS account which is in violation of several of the compliance controls.

If something is in violation of the compliance controls, there should be a human understandable failReason in the report, followed by the ControlId and a list of Offenders

In the above example, the S3 bucket pay-test-foo-bar-bucket does not have versioning enabled and the S3 buckets pay-test-foo-bar-bucket + pay-test-foo-bar-badger-bucket do not have logging enabled. There are also a number of CVEs in the test-12 environment

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