When managing GCP Service Accounts with terraform, it's often a question on how to avoid Service Account Key in the terraform state?
This blueprint shows how to manage IAM Service Account Keys by manually generating a key pair and uploading the public part of the key to GCP. It has the following benefits:
- no passing keys between users or systems
- no private keys stored in the terraform state (only public part of the key is in the state)
- let keys expire automatically
Clone this repository or open it in cloud shell, then go through the following steps to create resources:
Cleaning up blueprint keys
rm -f /public-keys/data-uploader/
rm -f /public-keys/prisma-security/
Generate keys for service accounts
mkdir keys && cd keys
openssl req -x509 -nodes -newkey rsa:2048 -days 30 \
-keyout data_uploader_private_key.pem \
-out ../public-keys/data-uploader/public_key.pem \
-subj "/CN=unused"
openssl req -x509 -nodes -newkey rsa:2048 -days 30 \
-keyout prisma_security_private_key.pem \
-out ../public-keys/prisma-security/public_key.pem \
-subj "/CN=unused"
Deploy service accounts and keys
cd ..
terraform init
terraform apply -var project_id=$GOOGLE_CLOUD_PROJECT
Extract JSON credentials templates from terraform output and put the private part of the keys into templates
terraform show -json | jq '.values.outputs."sa-credentials".value."data-uploader"."public_key.pem" | fromjson' > data-uploader.json
terraform show -json | jq '.values.outputs."sa-credentials".value."prisma-security"."public_key.pem" | fromjson' > prisma-security.json
contents=$(jq --arg key "$(cat keys/data_uploader_private_key.pem)" '.private_key=$key' data-uploader.json) && echo "$contents" > data-uploader.json
contents=$(jq --arg key "$(cat keys/prisma_security_private_key.pem)" '.private_key=$key' prisma-security.json) && echo "$contents" > prisma-security.json
Validate that service accounts json credentials are valid
gcloud auth activate-service-account --key-file prisma-security.json
gcloud auth activate-service-account --key-file data-uploader.json
terraform destroy -var project_id=$GOOGLE_CLOUD_PROJECT
name | description | type | required | default |
---|---|---|---|---|
project_id | Project id. | string |
✓ | |
project_create | Create project instead of using an existing one. | bool |
false |
|
service_accounts | List of service accounts. | list(object({…})) |
[…] |
|
services | Service APIs to enable. | list(string) |
[] |
name | description | sensitive |
---|---|---|
sa-credentials | SA json key templates. |