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Rotating Secrets I

Introduction

This guide assumes that you’re following the Offboarding Checklist found here and removed direct access to cloud.gov AWS accounts. The following guide walks a cloud.gov operator through rotating all sensitive information (secrets).

Please familiarize yourself with secret key management. You will be touching various parts of the platform from soup to nuts. Remember you have support from the entire team and it is helpful to coordinate with cloud.gov operators in case they are working on a particular piece of software that will requires a secrets rotation.

Rotate Access

It’s important that you rotate access to the platform first. This can be categorized with three different types of secrets.

  1. Remove access to Ops UAA
  2. Rotate cg-common passphrases
  3. Rotate CF deployment users
  4. Rotate all IAM Users
  5. Rotating Bosh
  6. Rotating Concourse
  7. Rotating Cloud Foundry / Diego

Rotate secrets passphrases

Create a new temporary directory as a workspace for all the secrets file(s) for any deployments which contain resources of type common and with names starting with common-*.

mkdir rotate-all-passphrases

Downloading all cg-common resources

After creating the directory, make sure you have authenticated with Concourse using fly login. Change into the temporary directory and run the following snippet to loop through all the pipelines and create a state-passphrases JSON file with the current state of all cg-common resources matching a name that starts with common-*.

Once that’s complete, run the grab-all-cg-common-resources.sh script from cg-scripts. The output file contains all of the cg-common resources found in Concourse.

Downloading all Concourse credentials

Leverage the Concourse Credentials bucket to update secrets passphrases. You can verify generate a list of all passphrases that need to be updated by querying Concourse. Though, every pipeline’s credentials.yml must also be updated and uploaded from that bucket in order to sync work across team members. In other words, do not rotate passphrases without also updating the matching concourse-credentials file in the S3 bucket.

Gather a list of all the pipelines currently deployed from Concourse.

fly --target fr pipelines | grep -Eo '^[a-z0-9\-]+'

Match this audit of active pipelines with those from Concourse credentials.

aws s3 ls s3://concourse-credentials/

Names found in the S3 bucket reference the name of the GitHub repository so it is necessary to add a prefix of cg- to the pipelines returned from fly pipelines, e.g. match the name based on GitHub URL.

Get the name of the repository by the origin remote URL

file_name=$(git config --local --get-regexp remote.origin.url | awk '{ print $2 }' | cut -d '/' -f 2 | sed 's/\.git//')
aws s3 cp s3://concourse-credentials/${file_name}.yml .

Get the name of the repository by the directory name

aws s3 cp s3://concourse-credentials/${PWD##*/}.yml .

Rotating Passphrases

Please reference secret key management for more information on what $CG_PIPELINE/decrypt.sh and $CG_PIPELINE/encrypt.sh are doing in the example below.

# Download secrets file.
aws s3 cp \
s3://${bucket_name}/${secrets_file}.yml \
${secrets_file}.yml.enc;

# Decrypt secrets file.
INPUT_FILE=${secrets_file}.yml.enc \
OUTPUT_FILE=${secrets_file}.yml \
PASSPHRASE="${old_passphrase}" \
$CG_PIPELINE/decrypt.sh;

# Encrypt secrets file with newly generated passphrase.
INPUT_FILE=${secrets_file}.yml \
OUTPUT_FILE=${secrets_file}.yml.enc \
PASSPHRASE="${new_passphrase}" \
$CG_PIPELINE/encrypt.sh;

# Edit the downloaded pipeline and replace the old_passphrase with the new_passphrase.
sed -i -- 's/old_passphrase/new_passphrase/' credentials.yml;

# Set the pipeline with the newly updated properties ( the diff only shows the secrets_passphrases being updated ).
fly --target fr \
set-pipeline \
--pipeline ${deploy_pipeline_name} \
--config=pipeline.yml \
--load-vars-from=credentials.yml;

# Upload the secrets file.
aws s3 cp \
--sse AES256 \
${secrets_file}.yml.enc \
s3://${bucket_name}/${secrets_file}.yml;

Rotating certificates

Generate new certificates for deployments using mutual TLS from the same Root CA certificate. These certificates should be rotated in three steps, as described in https://docs.cloudfoundry.org/deploying/common/consul-security.html#rotating-certs:

  1. Append new CA certificate
  2. Replace old certificates and keys
  3. Drop old CA certificate

Please see the cg-secret-rotation repository for more information about generating these certificates.

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