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When it comes to automating the creation of infrastructure in cloud providers, Terraform version at time of writing 0. Various bits of sensitive data is often provided as input to terraform. Also if you make use of modular terraform design patternsyou will also need to pass these variables through to your modules.
This blog provides details on how you can use Vault as part of an approach to help address this issue. This blog also introduces terrahelpa golang command line binary option 4 aes 8200 I wrote to help make this whole process a little bit easier.
So if you are having sleepless nights worrying about your unencrypted. Broadly speaking there are two high level approaches to addressing the challenge of securing terraform state, namely a local or remote approach.
With the remote approach your would delegate to Terraform to store and retrieve your state from Vault directly. Unfortunately native Terraform support for a Vault remote backed is not available yet and this blog is not specifically going to cover how to do this.
It will however cover how you can use Vault as part of a broader process to encrypt your local. To demonstrate this functionality I will be using a sample project which is also available as part of the terrahelp source code project in GitHub. If you want the specific versions as defined in this blog, i. The example terraform project only uses local resources i.
Although simple, the concepts translate equally well to being used in situations where you need to use sensitive values for more realistic scenarios like configuring database passwords etc. Running a terraform apply will produce the following output: As you can see, the sensitive binary option 4 aes 8200 are clearly stored in plaintext in the file — not great!
Terrahelp is a golang utility I wrote to automate and simplify additional tasks required when working with terraform. Doing local encryption as outlined above is the first concrete functionality it provides. You could achieve a similar outcome using your own bash scripts or any other language you choose, however I am really loving golangand this problem provided me binary option 4 aes 8200 an opportunity to solve it using my new favourite language. Terrahelp has the ability to use a simple inbuilt AES based encryption provider, however for the purposes of this blog, we are going to use the Vault provider.
Below is a diagram depicting a high level overview of how it is used in the context of encrypting and decrypting terraform tfstate files. We will go into more detail a bit later. You can get a version of the latest binary CLI from here You may want to add this into your path to make it easier to useor following the instructions on Github to build from source. In order to check that it is working, just execute the binary without any arguments and it should display the default help for you.
Vault based terrahelp encryption relies on having a Vault server running somewhere. You can quite easily download the latest version from herethen open up a new terminal, and for experimentation purposes, simply run the server in dev mode i.
Now you will need to configure Vault so that we can use its transit backend. More about this and how it works later. To binary option 4 aes 8200 up and running quickly, Terrahelp provides a command vault-autoconfig to help make this setup easier for you. Open up another terminal Vault will be running in the foreground of your last one and set the following environment variables to point at your Vault dev server:.
To make things less verbose, we will use environment variables here. First up we will use terrahelp itself to help auto configure its ability to binary option 4 aes 8200 the Vault provider for encryption. Assuming you grabbed a copy of the example terraform project code as described previously, change into the example sub folder. This might also be a good time to download the latest version of Terraform from here and put it on your path if you have not already done so.
Below we explicitly configure terrahelp to use full mode as well as the Vault provider, before proceeding to perform the actual encryption and decryption.
For more detailed info, please see the inbuilt help in the CLI. The above can now binary option 4 aes 8200 checked into version control without worrying about exposing credentials. You may be curious to find out exactly what encryption algorithm was used here, and what that terrahelp-encrypted vault: All will be explained later, lets first finish off the decryption side. Although encrypting the whole file is very secure, sometimes it would be nice to only encrypt the portions of the tfstate binary option 4 aes 8200 that are actually sensitive.
By switching to inline mode, terrahelp allows you to do just this. The steps involved in doing inline encryption and decryption are as follows: Notice how only the sensitive values in the above tfstate file have been replaced with an encrypted value.
Terrahelp uses this to ship off tfstate, and fragments of tfstate content to Vault to perform the encryption on its behalf, storing the results back in the tfstate files themselves. This is all done by having a named encryption key created and registered with binary option 4 aes 8200 typically by a security team. This named key can be configured to specify what kind of encryption algorithm to use and much more. Teams wanting to have content encrypted, need only know what the named encryption key is Note I said name not the actual key itself and then when interacting with Vault, this is used to perform the appropriate encryption and decryption.
The primary use case for the transit binary option 4 aes 8200 is to encrypt data from applications while allowing the app to store the encrypted data in some primary data store, in our case probably Git. Why is this cool? The downside however is that you need to always ensure Vault is running and available otherwise you may not be able to decrypt your content!
For more info on the transit backend in Vault please see the documentation here. One of the questions we previously sidestepped was what encryption algorithm was being used.
If you still have your vault server running the following command will provide info as to how this is configured. You will have noticed that all the encrypted values are eu trading and consulting group the following format: Starting from the inside, the vault: Having had whatever encryption algorithm applied to it, it is then subsequently base64 encoded and returned.
Vault has a concept of key rotation, allowing a new version of a named key to be generated. The example above indicates that version 1 of that named key was used for this encryption. Terrahelp itself then wraps this value with terrahelp-encrypted. This is simply to provide an easy way to identify and recognise a Terrahelp encrypted values in files. This proves especially useful for inline decryption as reproducing the plaintext state file is as simple as finding all the terrahelp encrypted values and replacing them with whatever Vault returns.
For inline encryption, terrahelp needs some mechanism to identify the sensitive data within an existing tfstate file. For this, it relies on the user supplying a terraform. This file, or its content was always intended to only be provided just in time for the terraform process to use.
Terrahelp is merely the orchestrator pulling all these various bits together, but essentially, the fundamental approach is quite simple. It also provides a demonstration of how the terrahelp utility can assist with this.
No doubt there is more to be done, and some edge cases probably not be covered, however I hope this post, and maybe the terrahelp utility itself can help you binary option 4 aes 8200 you are thinking about using Vault as part of securing your current terraform process. Thanks for reading and please do let me know your thoughts! Nicki is responsible for the overall direction and leadership of technical engagements within OpenCredo.
Your email address will not be published. Automating binary option 4 aes 8200 improving your software delivery process using Continuous Delivery design methods and best practices around DevOps. General approach A tale of two approaches Broadly speaking there are two high level approaches to addressing the challenge of securing terraform state, namely a local or remote approach.
The local approach For encryption Perform standard terraform functionality i. Creation complete Apply complete! The state of your infrastructure has been saved to the path below. This state is required to modify and destroy your infrastructure, so keep it safe.
Getting terrahelp You can get a version of binary option 4 aes 8200 latest binary CLI from here You may want to add this into your path to make it easier to useor following the instructions on Github to build from source. Open up another terminal Vault will be running in the foreground of your last one and set the following environment variables to point at your Vault dev server: Grab example terraform project Assuming you binary option 4 aes 8200 a copy of the example terraform project code as described previously, change into the example sub folder.
The named encryption key One of the questions we previously sidestepped was what encryption algorithm was being used. Comments Hi thanks for the information!! Trackbacks Terraform Resources Reference https: Leave a Reply Cancel reply Your email address will not be published. Want to talk about your project? We offer you a free consultation with one of our specialist team members.