81 lines
2.7 KiB
Markdown
81 lines
2.7 KiB
Markdown
# Decentralized firewall validator
|
|
|
|
The decentralized firewall validator is a Python scripts that utilizes [Yamale](https://github.com/23andMe/Yamale) schema
|
|
validation library to validate the configured firewall rules.
|
|
|
|
## Configuring schemas
|
|
|
|
There are three configuration files:
|
|
- [firewallSchema.yaml](firewallSchema.yaml), where the basic validation schema is configured
|
|
- [firewallSchemaAutoApprove.yaml](firewallSchemaAutoApprove.yaml), where the a different schema for auto-approval
|
|
can be configured (in case more validation is required than what is available in the schema settings)
|
|
- [firewallSchemaSettings.yaml](firewallSchemaSettings.yaml), configures list of allowed and approved
|
|
source and destination ranges, ports, network tags and service accounts.
|
|
|
|
## Building the container
|
|
|
|
You can build the container like this:
|
|
|
|
```sh
|
|
docker build -t eu.gcr.io/YOUR-PROJECT/firewall-validator:latest .
|
|
docker push eu.gcr.io/YOUR-PROJECT/firewall-validator:latest
|
|
```
|
|
|
|
## Running the validator
|
|
|
|
Example:
|
|
|
|
```sh
|
|
docker run -v $(pwd)/firewall:/rules/ -t eu.gcr.io/YOUR-PROJECT/firewall-validator:latest
|
|
```
|
|
|
|
Output is JSON with keys `ok` and `errors` (if any were found).
|
|
|
|
## Using as a GitHub action
|
|
|
|
An `action.yml` is provided for this validator to be used as a GitHub action.
|
|
|
|
Example of being used in a pipeline:
|
|
|
|
```yaml
|
|
- uses: actions/checkout@v2
|
|
|
|
- name: Get changed files
|
|
if: ${{ github.event_name == 'pull_request' }}
|
|
id: changed-files
|
|
uses: tj-actions/changed-files@v1.1.2
|
|
|
|
- uses: ./.github/actions/validate-firewall
|
|
if: ${{ github.event_name == 'pull_request' }}
|
|
id: validation
|
|
with:
|
|
files: ${{ steps.changed-files.outputs.all_modified_files }}
|
|
|
|
- uses: actions/github-script@v3
|
|
if: ${{ github.event_name == 'pull_request' && steps.validation.outputs.ok != 'true' }}
|
|
with:
|
|
github-token: ${{ secrets.GITHUB_TOKEN }}
|
|
script: |
|
|
var comments = [];
|
|
var errors = JSON.parse(process.env.ERRORS);
|
|
for (const filename in errors) {
|
|
var fn = filename.replace('/github/workspace/', '');
|
|
comments.push({
|
|
path: fn,
|
|
body: "```\n" + errors[filename].join("\n") + "\n```\n",
|
|
position: 1,
|
|
});
|
|
}
|
|
github.pulls.createReview({
|
|
owner: context.repo.owner,
|
|
repo: context.repo.repo,
|
|
pull_number: context.issue.number,
|
|
event: "REQUEST_CHANGES",
|
|
body: "Firewall rule validation failed.",
|
|
comments: comments,
|
|
});
|
|
core.setFailed("Firewall validation failed");
|
|
env:
|
|
ERRORS: '${{ steps.validation.outputs.errors }}'
|
|
```
|