80 lines
4.2 KiB
Markdown
80 lines
4.2 KiB
Markdown
# Managing on-prem service account keys by uploading public keys
|
|
|
|
When managing GCP Service Accounts with terraform, it's often a question on **how to avoid Service Account Key in the terraform state?**
|
|
|
|
This example shows how to manage IAM Service Account Keys by generating a key pair and uploading the public part of the key to GCP, it has the following benefits:
|
|
|
|
- no [passing keys between users](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys#pass-between-users) or systems
|
|
- no SA key stored in the terraform state (only public part of the key in the state)
|
|
- let keys [expire automatically](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys#key-expiryhaving)
|
|
|
|
|
|
## Running the example
|
|
|
|
Clone this repository or [open it in cloud shell](https://ssh.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fterraform-google-modules%2Fcloud-foundation-fabric&cloudshell_print=cloud-shell-readme.txt&cloudshell_working_dir=cloud-operations%2Fonprem-sa-key-management&cloudshell_open_in_editor=cloudshell_open%2Fcloud-foundation-fabric%2Fcloud-operations%2Fonprem-sa-key-management%2Fvariables.tf), then go through the following steps to create resources:
|
|
|
|
Cleaning up example keys
|
|
```bash
|
|
rm -f /public-keys/data-uploader/
|
|
rm -f /public-keys/prisma-security/
|
|
```
|
|
|
|
Generate keys for service accounts
|
|
```bash
|
|
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
|
|
```bash
|
|
cd ..
|
|
terraform init
|
|
terraform apply -var project_id=$GOOGLE_CLOUD_PROJECT
|
|
|
|
```
|
|
|
|
Extract JSON credentials templates from terraform output and put the private part of the keys into templates
|
|
```bash
|
|
terraform show -json | jq '.values.outputs."sa-credentials".value."data-uploader"."public_key.pem" | fromjson' > data-uploader.json
|
|
terraform show -json | jq '.values.outputs."sa-credentials".value."prisma-security"."public_key.pem" | fromjson' > prisma-security.json
|
|
|
|
contents=$(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 "$contents" > prisma-security.json
|
|
```
|
|
|
|
## Testing the example
|
|
Validate that service accounts json credentials are valid
|
|
```bash
|
|
gcloud auth activate-service-account --key-file prisma-security.json
|
|
gcloud auth activate-service-account --key-file data-uploader.json
|
|
```
|
|
|
|
## Cleaning up
|
|
```bash
|
|
terraform destroy -var project_id=$GOOGLE_CLOUD_PROJECT
|
|
```
|
|
|
|
<!-- BEGIN TFDOC -->
|
|
## Variables
|
|
|
|
| name | description | type | required | default |
|
|
|---|---|:---: |:---:|:---:|
|
|
| project_id | Project id. | <code title="">string</code> | ✓ | |
|
|
| *project_create* | Create project instead of using an existing one. | <code title="">bool</code> | | <code title="">false</code> |
|
|
| *service_accounts* | List of service accounts. | <code title="list(object({ name = string iam_project_roles = list(string) public_keys_path = string }))">list(object({...}))</code> | | <code title="[ { name = "data-uploader" iam_project_roles = [ "roles/bigquery.dataOwner", "roles/bigquery.jobUser", "roles/storage.objectAdmin" ] public_keys_path = "public-keys/data-uploader/" }, { name = "prisma-security" iam_project_roles = [ "roles/iam.securityReviewer" ] public_keys_path = "public-keys/prisma-security/" }, ]">...</code> |
|
|
| *services* | Service APIs to enable. | <code title="list(string)">list(string)</code> | | <code title="">[]</code> |
|
|
|
|
## Outputs
|
|
|
|
| name | description | sensitive |
|
|
|---|---|:---:|
|
|
| sa-credentials | SA json key templates. | |
|
|
<!-- END TFDOC -->
|