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exec-with-secrets

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Handle secrets in Docker using AWS KMS, SSM parameter store, Secrets Manager, or Azure Key Vault

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# Inject secrets from AWS KMS/SSM/Secrets Manager and Azure Key Vault into your app environment

`exec-with-secrets` supports the following services as secrets providers:
 - [AWS Key Management (KMS)](https://aws.amazon.com/kms/)
 - [AWS Systems Manager Parameter Store (SSM)](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-paramstore.html)
 - [AWS Secrets Manager](https://aws.amazon.com/secrets-manager/)
 - [Azure Key Vault](https://azure.microsoft.com/en-in/services/key-vault/)

This utility looks for prefixed variables in environment and replaces them with secret values:
 - `{aws-kms}AQICAHjA3mwbmf...` - decrypts the value using AWS KMS
 - `{aws-ssm}/app/param` - loads parameter `/app/param` from AWS Systems Manager Parameter Store
 - `{aws-sm}/app/param` - loads secret `/app/param` from AWS Secrets Manager
 - `{aws-sm}/app/param[prop1]` - loads secret `/app/param` from AWS Secrets Manager and takes `prop1` property
 - `{az-kv}vault/name` - loads secret `name` from Azure Key Vault `vault`
 
After decrypting secrets it runs [`exec`](https://en.wikipedia.org/wiki/Exec_(system_call)) system call, replacing itself with your app.
The app can simply access decrypted secrets in the environment.

Basic example:
```
SECRET="{aws-ssm}/my/secret" exec-with-secrets myapp # SECRET value is in myapp environment
```

## Docker example

Build the example Docker image:

```
make docker
```

Run:
```
docker run -e PARAM="text" -e KMS_PARAM="{aws-kms}c2VjcmV0" exec-with-secrets-example echo $KMS_PARAM
```

You need to put a real KMS-encrypted value and pass AWS credentials to the container.

- `KMS_PARAM` will be decrypted and passed to `echo` as an environment variable
 - `PARAM` will be passed without modifications

You can adapt [Dockerfile](Dockerfile) for your use-case. Use `exec-with-secrets` just like the regular `exec`. For example, run a Java application with:
```
CMD exec-with-secrets java -jar myapp.jar
```
**Note that the decrypted secrets are only visible to your application. `docker inspect` will show encrypted values**

## Secret provider access

Your container should have appropriate permissions to the secrets provider.

- The default AWS credentials chain is used
 - Azure authorizer from environment variables/MSI
 - Azure authorizer from configuration file, if the file is set using `AZURE_AUTH_LOCATION` variable

## Build

`make` builds Linux and Mac binaries with all providers.

### Choose providers

To chose providers (for example only AWS SSM), run:
```
make TAGS=awsssm
```

## Adding a new provider

See example PR: https://github.com/s12v/exec-with-secrets/pull/1

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