tfmask

Command line utility to mask sensitive output from a transform plan or terraform apply.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

It's 100% Open Source and licensed under the APACHE2.

Screenshots

Example of masking output from a terraform plan execution Example of masking output from a terraform apply execution

Introduction

If you answer "yes" to any of these questions, then look no further!

• Have you ever wished you could easily filter sensitive output from a terraform plan or terraform apply?
• Do you use terraform providers that leak sensitive data to stdout (e.g. terraform-github-provider)?

Yes? Great! Then this utility is for you.

The tfmask utility will replace the "old value" and the "new value" with the masking character (e.g. *).

NOTE: tfmask will preserve the name of the nodes in the graph

Usage

NOTE: The utility supports a number of configuration settings which can be passed via environment variables.

IMPORTANT: Pass -no-color to terraform plan and terraform apply for proper parsing

The basic usage looks like this. We're going to run terraform plan and filter it through tfmask:

terraform plan -no-color | tfmask

Direnv

You can use tfmask with direnv to set the defaults.

Example .envrc:

# Export terraform environment
export TFMASK_CHAR="#"
export TFMASK_VALUES_REGEX="(?i)^.*[^a-zA-Z](oauth|secret|token|password|key|result|id).*$"

Terraform will perform the following actions:

  ~ module.atlantis.module.web_app.module.ecs_codepipeline.aws_codepipeline.source_build_deploy
      stage.0.action.0.configuration.%:          "4" => "5"
      stage.0.action.0.configuration.OAuthToken: "" => "*******************************************"

Plan: 0 to add, 1 to change, 0 to destroy.

Examples

Compiling the Binary

make go/build

Use with Terraform Plan

Many terraform providers unintentionally leak sensitive information when running terraform plan. This is very bad.

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  ~ module.example.aws_codepipeline.source_build_deploy
      stage.0.action.0.configuration.%:          "4" => "5"
      stage.0.action.0.configuration.OAuthToken: "" => "efba05dbe9b94ba18ae3737a6d6de16eefba05dbe9b9"
Plan: 0 to add, 1 to change, 0 to destroy.

Using tfmask, the output from terraform plan will be masked like this:

terraform plan -no-color | tfmask

 An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  ~ module.example.aws_codepipeline.source_build_deploy
      stage.0.action.0.configuration.%:          "4" => "5"
      stage.0.action.0.configuration.OAuthToken: "" => ********************************************"
Plan: 0 to add, 1 to change, 0 to destroy.

Use with Terraform Apply

Many terraform providers unintentionally leak sensitive information when running terraform apply. This is very bad.

terraform apply
module.example.aws_codepipeline.source_build_deploy: Modifying... (ID: example-codepipeline)
  stage.0.action.0.configuration.%:          "4" => "5"
  stage.0.action.0.configuration.OAuthToken: "" => "efba05dbe9b94ba18ae3737a6d6de16eefba05dbe9b9"
module.example.aws_codepipeline.source_build_deploy: Modifications complete after 1s (ID: example-codepipeline)

Apply complete! Resources: 0 added, 1 changed, 0 destroyed.

Using tfmask, the output from terraform apply will be masked like this:

terraform apply -no-color | tfmask

module.example.aws_codepipeline.source_build_deploy: Modifying... (ID: example-codepipeline)
  stage.0.action.0.configuration.%:          "4" => "5"
  stage.0.action.0.configuration.OAuthToken: "" => "********************************************"                                                 
module.example.aws_codepipeline.source_build_deploy: Modifications complete after 1s (ID: example-codepipeline)

Apply complete! Resources: 0 added, 1 changed, 0 destroyed.

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Related Projects

Check out these related projects.

• Packages - Cloud Posse installer and distribution of native apps
• build-harness - Collection of Makefiles to facilitate building Golang projects, Dockerfiles, Helm charts, and more
• geodesic - Geodesic is the fastest way to get up and running with a rock solid, production grade cloud platform built on strictly Open Source tools.
• direnv - Unclutter your .profile with an environment switcher for the shell
• tfenv - Transform environment variables for use with Terraform (e.g. HOSTNAME ⇨ TF_VAR_hostname)

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Copyright

Copyright © 2017-2020 Cloud Posse, LLC

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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  https://www.apache.org/licenses/LICENSE-2.0

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Contributors

Erik Osterman