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.

Environment Variable	Description	Default
`TFMASK_CHAR`	Character used to mask all output	`*`
`TFMASK_VALUES_REGEX`	Regular expression used to match values	[see code]
`TFMASK_RESOURCES_REGEX`	Regular expression used to match resources	[see code]

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).*$"

Example of Masked Output

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.

Example of a Leaked Secret from a Terraform Plan

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.

NOTE: This OAuthToken is just an example and not a valid token.

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

terraform plan -no-color | tfmask

Example of Masked Terraform Plan Output

 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.

Example of a Leaked Secret from a Terraform Apply

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.

NOTE: This OAuthToken is just an example and not a valid token.

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

terraform apply -no-color | tfmask

Example of Masked Terraform Apply Output

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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Contributing

Bug Reports & Feature Requests

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Copyright

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

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software distributed under the License is distributed on an
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Contributors

Erik Osterman

cloudposse/tfmask

cloudposse

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