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Supervisor program to constrain Windows executables running under Nomad's raw_exec driver

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NOTICE: SUPPORT FOR THIS PROJECT ENDED ON 18 November 2020

This projected was owned and maintained by Jet.com (Walmart). This project has reached its end of life and Walmart no longer supports this project.

We will no longer be monitoring the issues for this project or reviewing pull requests. You are free to continue using this project under the license terms or forks of this project at your own risk. This project is no longer subject to Jet.com/Walmart's bug bounty program or other security monitoring.

## Actions you can take

We recommend you take the following action:

* Review any configuration files used for build automation and make appropriate updates to remove or replace this project
  * Notify other members of your team and/or organization of this change
  * Notify your security team to help you evaluate alternative options

## Forking and transition of ownership

For [security reasons](https://www.theregister.co.uk/2018/11/26/npm_repo_bitcoin_stealer/), Walmart does not transfer the ownership of our primary repos on Github or other platforms to other individuals/organizations. Further, we do not transfer ownership of packages for public package management systems.

If you would like to fork this package and continue development, you should choose a new name for the project and create your own packages, build automation, etc.

Please review the licensing terms of this project, which continue to be in effect even after decommission.

ORIGINAL README BELOW

----------------------

[![Build status](https://ci.appveyor.com/api/projects/status/412auj8v5yxj1nx0/branch/master?svg=true)](https://ci.appveyor.com/project/Jet/damon/branch/master)

# Damon

Damon is a supervisor program to constrain windows executables that are run under the `raw_exec` driver in Nomad.

## Usage

To use Damon, run it before your command.

```
damon.exe yourapp.exe [args]
```

## Configuration

Damon uses environment variables to configure process monitoring and resource constraints.

### Logging Options

- `DAMON_LOG_MAX_FILES`: the number of old logs to keep after rotating.
- `DAMON_LOG_MAX_SIZE`: the maximum size (in MB) of the active log file before it gets rotated.
- `DAMON_LOG_DIR`: directory in which to place damon log files. When `DAMON_LOG_DIR` is unset, it will attempt to use the standard nomad log directory `${NOMAD_ALLOC_DIR}/logs`. If `NOMAD_ALLOC_DIR` is unset, then it will default to the current working directory.
- `DAMON_NOMAD_LOG_SUFFIX`: Is appended to the log name of the active log file. Rotated log files contain a datestamp. The default value is `.damon.log`
- `DAMON_LOG_NAME`: Is the full name of the log file (without the directory) - Setting this overrides `DAMON_NOMAD_LOG_SUFFIX`. When this is unset, it will default to `${NOMAD_TASK_NAME}${DAMON_NOMAD_LOG_SUFFIX}`

### Constraint Options

- `DAMON_ENFORCE_CPU_LIMIT`: When set to `Y` - it enforces CPU constraints on the wrapped process. Set to 'N' to disable CPU-rate limits. (Default: 'Y')
- `DAMON_ENFORCE_MEMORY_LIMIT`: When set to `Y` - it enforces memory limits on the wrapped process. Set to 'N' to disable memory limits. (Default: 'Y')
- `DAMON_CPU_LIMIT`: The CPU Limit in MHz. Defaults to `NOMAD_CPU_LIMIT`.
- `DAMON_MEMORY_LIMIT`: The Memory Limit in MB. Defaults to `NOMAD_MEMORY_LIMIT`.
- `DAMON_RESTRICTED_TOKEN`: When set to `Y` - it runs the wrapped process with a [Restricted Token](https://docs.microsoft.com/en-us/windows/desktop/SecAuthZ/restricted-tokens):
    - Drops all [Privileges](https://docs.microsoft.com/en-us/windows/desktop/secauthz/privileges)
    - Disables the `BUILTIN\Administrator` SID

### Metrics Options

- `DAMON_ADDR`: Listens on this address to serve prometheus metrics. Default: `${NOMAD_ADDR_damon}`
    This option is designed to work with the `NOMAD_ADDR_damon` environment variable.
    This means you should change your job spec to:
    - request a port labeled `"damon"`
    - add a service to the task that advertises the "damon" port to Consul service discovery - so that your prometheus infrastructure can find it and scrape it.
- `DAMON_METRICS_ENDPOINT`: The path to the prometheus metrics endpoint. Default: `/metrics`

## Building & Testing Damon

Included with this repository is `make.ps1` which can be used to build `damon.exe` and also run tests.

### Build Binary

```posh
.\make.ps1 -Build
```

### Lint Code

Runs [golangci-lint](https://github.com/golangci/golangci-lint) against the codebase. It will [Install golangci-lint](https://github.com/golangci/golangci-lint#local-installation) if it doesn't exist in `${GOPATH}/bin`.

```posh
.\make.ps1 -Lint
```

### Test Code

Runs tests and generates code coverage files.

```posh
.\make.ps1 -Test
```

## Give it a Try

Check out the [examples directory](examples/) for scripts and job definitions.

- Locally: [damon-test-locally.ps1](examples/damon-test-locally.ps1)
- On Nomad: [damon-job.nomad](examples/damon-job.nomad)

Be sure to alter to environment variables, artifact locations, etc... to match your environment.

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