unicreds

Unicreds is a command line tool to manage secrets within an AWS account, the aim is to keep securely stored with your systems and data so you don't have to manage them externally. It uses DynamoDB and KMS to store and encrypt these secrets. Access to these keys is controlled using IAM.

Unicreds is written in Go and is based on credstash.

setup

1. Create a KMS key in IAM, using an aws profile you have configured in the aws CLI. You can ommit --profile if you use the Default profile.

aws --region ap-southeast-2 --profile [yourawsprofile] kms create-key --query 'KeyMetadata.KeyId'

Note: You will also need to assign permission to users other than the root account to access and use the key see How to Help Protect Sensitive Data with AWS KMS. 2. Assign the credstash alias to the key using the key id printed when you created the KMS key.

aws --region ap-southeast-2 --profile [yourawsprofile] kms create-alias --alias-name 'alias/credstash' --target-key-id "xxxx-xxxx-xxxx-xxxx-xxxx"

3. Run unicreds setup to create the dynamodb table in your region, ensure you have your credentials configured using the awscli.

unicreds setup --region ap-southeast-2 --profile [yourawsprofile]

Note: It is really important to tune DynamoDB to your read and write requirements if you're using unicreds with automation!

demo

To illustrate how unicreds works I made a screen recording of list, put, get and delete.

usage

usage: unicreds [<flags>] <command> [<args> ...]

A credential/secret storage command line tool.

Flags:
      --help                     Show context-sensitive help (also try --help-long and
                                 --help-man).
  -c, --csv                      Enable csv output for table data.
  -d, --debug                    Enable debug mode.
  -j, --json                     Output results in JSON
  -r, --region=REGION            Configure the AWS region
  -p, --profile=PROFILE          Configure the AWS profile
  -R, --role=ROLE                Specify an AWS role ARN to assume
  -e, --endpoint=ENDPOINT        Override default endpoint (e.g. Localstack)
  -t, --table="credential-store"
                                 DynamoDB table.
  -k, --alias="alias/credstash"  KMS key alias.
  -E, --enc-context=ENC-CONTEXT ...
                                 Add a key value pair to the encryption context.
      --version                  Show application version.

Commands:
  help [<command>...]
    Show help.

  setup
    Setup the dynamodb table used to store credentials.

  get <credential> [<version>]
    Get a credential from the store.

  getall [<flags>]
    Get latest credentials from the store.

  list [<flags>]
    List latest credentials with names and version.

  put <credential> <value> [<version>]
    Put a credential into the store.

  put-file <credential> <value> [<version>]
    Put a credential from a file into the store.

  delete <credential>
    Delete a credential from the store.

  exec <command>...
    Execute a command with all secrets loaded as environment variables.

Unicreds supports the AWS_* environment variables, and configuration in ~/.aws/credentials and ~/.aws/config

examples

• List secrets using default profile:

$ unicreds list

• List secrets using the default profile, in a different region:

$ unicreds -r us-east-2 list
$ AWS_REGION=us-east-2 unicreds list

• List secrets using profile MYPROFILE in ~/.aws/credentials or ~/.aws/config

$ unicreds -r us-west-2 -p MYPROFILE list
$ AWS_PROFILE=MYPROFILE unicreds list

• List secrets using a profile, but also assuming a role:

$ unicreds -r us-west-2 -p MYPROFILE -R arn:aws:iam::123456789012:role/MYROLE list

• Store a login for test123 from unicreds using the encryption context feature.

$ unicreds -r us-west-2 put test123 -E 'stack:123' testingsup
   • stored                    name=test123 version=0000000000000000001

• Retrieve a login for test123 from unicreds using the encryption context feature.

$ unicreds -r us-west-2 get test123 -E 'stack:123'
testingsup

• Example of a failed encryption context check.

$ unicreds -r us-west-2 get test123 -E 'stack:12'
   ⨯ failed                    error=InvalidCiphertextException:
	status code: 400, request id: 0fed8a0b-5ea1-11e6-b359-fd8168c3c784

• Execute env command, all secrets are loaded as environment variables.

$ unicreds -r us-west-2 exec -- env

references

• How to Protect the Integrity of Your Encrypted Data by Using AWS Key Management Service and EncryptionContext

install

If you're on OSX you can install unicreds using homebrew now!

brew tap versent/homebrew-taps
brew install unicreds

Otherwise grab an archive from the github releases page.

development

I use scantest to watch my code and run tests on save.

go get github.com/smartystreets/scantest

testing

You can run unit tests which mock out the KMS and DynamoDB backend using make test.

There is an integration test you can run using make integration. You must set the AWS_REGION (default us-west-2), UNICREDS_KEY_ALIAS (default alias/unicreds), and UNICREDS_TABLE_NAME (default credential-store) environment variables to point to valid AWS resources.

auto-versioning

If you've been using unicreds auto-versioning before September 2015, Unicreds had the same bug as credstash when auto-versioning that results in a sorting error after ten versions. You should be able to run the credstash-migrate-autoversion.py script included in the root of the credstash repository to update your versions prior to using the latest version of unicreds.

Docker ENTRYPOINT

It is possible to use unicreds exec as an entrypoint for loading safely your secrets as environment variables inside your container in AWS ECS.

Example

RUN curl -sL \
    https://github.com/Versent/unicreds/releases/download/v1.5.0/unicreds_1.5.0_linux_x86_64.tgz \
 | tar zx -C /usr/local/bin \
 && chmod +x /usr/local/bin/unicreds
ENTRYPOINT ["/usr/local/bin/unicreds", "exec", "--"]

With IAM roles for Amazon ECS tasks you can give the necessary privileges to your container so that it can exploit unicreds.

todo

• Add the ability to filter list / getall results using DynamoDB filters, at the moment I just use | grep blah.
• Work on the output layout.
• Make it easier to import files

license

This code is Copyright (c) 2015 Versent and released under the MIT license. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE.md file for more details.