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Commit 3e32ff19 authored by Pierre Smeyers's avatar Pierre Smeyers
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Merge branch 'add-gcp-adc-auth' into 'master' 

feat(gcp): setup GCP credentials through ADC

See merge request to-be-continuous/kubernetes!83
parents a3edd395 ff599041
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README.md
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......@@ -549,3 +549,64 @@ variables:
K8S_DEFAULT_KUBE_CONFIG: "@url@http://vault-secrets-provider/api/secrets/b7ecb6ebabc231/my-app/kubernetes/noprod?field=kube_config"
K8S_PROD_KUBE_CONFIG: "@url@http://vault-secrets-provider/api/secrets/b7ecb6ebabc231/my-app/kubernetes/prod?field=kube_config"
```
### Google Cloud variant
This variant uses [Application Default Credentials][gcp-adc] through the `GOOGLE_APPLICATION_CREDENTIALS` variable using Workload Identity federation.
List of requirements before using this variant:
1. You must have a Workload Identity Federation Pool and Provider configured,
2. You must have a Service Account with the `roles/iam.workloadIdentityUser` IAM role
granted to the Workload Identity [principal][gcp-iam-principals] matching your Gitlab project or group,
3. Optionally, you can set the `GOOGLE_CLOUD_PROJECT` template variable
to define the default Google Cloud project.
4. You must have create a `kubeconfig.yaml` configuration which [enable application default credentials for kubectl](https://cloud.google.com/kubernetes-engine/docs/how-to/api-server-authentication#environments-without-gcloud)
The Gitlab documentation has some [details about Workload Identity Federation integration][gcp-gitlab-wif].
This [blog post about OIDC impersonation through Workload Identify Federation][gcp-wif-example] might also be of help.
[gcp-adc]: https://cloud.google.com/docs/authentication/client-libraries
[gcp-provider]: https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/provider_reference#running-terraform-outside-of-google-cloud
[gcp-iam-principals]: https://cloud.google.com/iam/docs/principal-identifiers
[gcp-gitlab-wif]: https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/
[gcp-wif-example]: https://blog.salrashid.dev/articles/2021/understanding_workload_identity_federation/#oidc-impersonated
#### Configuration
The variant requires the additional configuration parameters:
| Input / Variable | Description | Default value |
| ----------------- | -------------------------------------- | ----------------- |
| `gcp-oidc-aud` / `GCP_OIDC_AUD` | The `aud` claim for the JWT token | `$CI_SERVER_URL` |
| `gcp-oidc-provider` / `GCP_OIDC_PROVIDER` | Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) | _none_ |
| `gcp-oidc-account` / `GCP_OIDC_ACCOUNT` | Default Service Account to which impersonate with OpenID Connect authentication | _none_ |
| `gcp-review-oidc-provider` / `GCP_REVIEW_OIDC_PROVIDER` | Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `review` environment _(only define to override default)_ | _none_ |
| `gcp-review-oidc-account` / `GCP_REVIEW_OIDC_ACCOUNT` | Service Account to which impersonate with OpenID Connect authentication on `review` environment _(only define to override default)_ | _none_ |
| `gcp-integ-oidc-provider` / `GCP_INTEG_OIDC_PROVIDER` | Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `integration` environment _(only define to override default)_ | _none_ |
| `gcp-integ-oidc-account` / `GCP_INTEG_OIDC_ACCOUNT` | Service Account to which impersonate with OpenID Connect authentication on `integration` environment _(only define to override default)_ | _none_ |
| `gcp-staging-oidc-provider` / `GCP_STAGING_OIDC_PROVIDER` | Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `staging` environment _(only define to override default)_ | _none_ |
| `gcp-staging-oidc-account` / `GCP_STAGING_OIDC_ACCOUNT` | Service Account to which impersonate with OpenID Connect authentication on `staging` environment _(only define to override default)_ | _none_ |
| `gcp-prod-oidc-provider` / `GCP_PROD_OIDC_PROVIDER` | Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `production` environment _(only define to override default)_ | _none_ |
| `gcp-prod-oidc-account` / `GCP_PROD_OIDC_ACCOUNT` | Service Account to which impersonate with OpenID Connect authentication on `production` environment _(only define to override default)_ | _none_ |
| `kubectl-image` / `K8S_KUBECTL_IMAGE` | The Docker image used to run Kubernetes `kubectl` commands on [GKE](https://cloud.google.com/kubernetes-engine/docs) | `gcr.io/google.com/cloudsdktool/cloud-sdk:latest` |
#### Example
With a common default `GCP_OIDC_PROVIDER` and `GCP_OIDC_ACCOUNT` configuration for non-prod environments, and a specific one for production:
```yaml
include:
# main template
- component: gitlab.com/to-be-continuous/kubernetes/gitlab-ci-k8s@6.2.0
# Google Cloud variant
- component: gitlab.com/to-be-continuous/kubernetes/gitlab-ci-k8ss-gcp@6.2.0
inputs:
# common OIDC config for non-prod envs
gcp-oidc-provider: "projects/<gcp_nonprod_proj_id>/locations/global/workloadIdentityPools/<pool_id>/providers/<provider_id>"
gcp-oidc-account: "<name>@$<gcp_nonprod_proj_id>.iam.gserviceaccount.com"
# specific OIDC config for prod
gcp-prod-oidc-provider: "projects/<gcp_prod_proj_id>/locations/global/workloadIdentityPools/<pool_id>/providers/<provider_id>"
gcp-prod-oidc-account: "<name>@$<gcp_prod_proj_id>.iam.gserviceaccount.com"
```
kicker.json
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......@@ -303,6 +303,73 @@
"secret": true
}
]
},
{
"id": "gcp-auth-provider",
"name": "Google Cloud",
"description": "This variant uses [Application Default Credentials][gcp-adc] through the `GOOGLE_APPLICATION_CREDENTIALS` variable using Workload Identity federation.",
"template_path": "templates/gitlab-ci-k8s-gcp.yml",
"variables": [
{
"name": "GCP_OIDC_AUD",
"description": "The `aud` claim for the JWT token _(only required for [OIDC authentication](https://docs.gitlab.com/ee/ci/cloud_services/aws/))_",
"default": "$CI_SERVER_URL",
"advanced": true
},
{
"name": "GCP_OIDC_ACCOUNT",
"description": "Default Service Account to which impersonate with OpenID Connect authentication"
},
{
"name": "GCP_OIDC_PROVIDER",
"description": "Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/)"
},
{
"name": "GCP_REVIEW_OIDC_ACCOUNT",
"description": "Service Account to which impersonate with OpenID Connect authentication on `review` environment",
"advanced": true
},
{
"name": "GCP_REVIEW_OIDC_PROVIDER",
"description": "Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `review` environment",
"advanced": true
},
{
"name": "GCP_INTEG_OIDC_ACCOUNT",
"description": "Service Account to which impersonate with OpenID Connect authentication on `integration` environment",
"advanced": true
},
{
"name": "GCP_INTEG_OIDC_PROVIDER",
"description": "Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `integration` environment",
"advanced": true
},
{
"name": "GCP_STAGING_OIDC_ACCOUNT",
"description": "Service Account to which impersonate with OpenID Connect authentication on `staging` environment",
"advanced": true
},
{
"name": "GCP_STAGING_OIDC_PROVIDER",
"description": "Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `staging` environment",
"advanced": true
},
{
"name": "GCP_PROD_OIDC_ACCOUNT",
"description": "Service Account to which impersonate with OpenID Connect authentication on `production` environment",
"advanced": true
},
{
"name": "GCP_PROD_OIDC_PROVIDER",
"description": "Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `production` environment",
"advanced": true
},
{
"name": "K8S_KUBECTL_IMAGE",
"description": "The Docker image used to run Kubernetes `kubectl` commands on [GKE](https://cloud.google.com/kubernetes-engine/docs)",
"default": "gcr.io/google.com/cloudsdktool/cloud-sdk:latest"
}
]
}
]
}
templates/gitlab-ci-k8s-gcp.yml 0 → 100644
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# =====================================================================================================================
# === Google Cloud template variant
# =====================================================================================================================
spec:
inputs:
kubectl-image:
description: The Docker image used to run Kubernetes `kubectl` commands on [GKE](https://cloud.google.com/kubernetes-engine/docs)
default: gcr.io/google.com/cloudsdktool/cloud-sdk:latest
gcp-oidc-aud:
description: The `aud` claim for the JWT token
default: $CI_SERVER_URL
gcp-oidc-account:
description: Default Service Account to which impersonate with OpenID Connect authentication
default: ''
gcp-oidc-provider:
description: Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/)
default: ''
gcp-review-oidc-account:
description: Service Account to which impersonate with OpenID Connect authentication on `review` environment
default: ''
gcp-review-oidc-provider:
description: Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `review` environment
default: ''
gcp-integ-oidc-account:
description: Service Account to which impersonate with OpenID Connect authentication on `integration` environment
default: ''
gcp-integ-oidc-provider:
description: Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `integration` environment
default: ''
gcp-staging-oidc-account:
description: Service Account to which impersonate with OpenID Connect authentication on `staging` environment
default: ''
gcp-staging-oidc-provider:
description: Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `staging` environment
default: ''
gcp-prod-oidc-account:
description: Service Account to which impersonate with OpenID Connect authentication on `production` environment
default: ''
gcp-prod-oidc-provider:
description: Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) on `production` environment
default: ''
---
variables:
# variabilized gcp-auth-provider image
GCP_OIDC_AUD: $[[ inputs.gcp-oidc-aud ]]
GCP_OIDC_ACCOUNT: $[[ inputs.gcp-oidc-account ]]
GCP_OIDC_PROVIDER: $[[ inputs.gcp-oidc-provider ]]
GCP_REVIEW_OIDC_ACCOUNT: $[[ inputs.gcp-review-oidc-account ]]
GCP_REVIEW_OIDC_PROVIDER: $[[ inputs.gcp-review-oidc-provider ]]
GCP_INTEG_OIDC_ACCOUNT: $[[ inputs.gcp-integ-oidc-account ]]
GCP_INTEG_OIDC_PROVIDER: $[[ inputs.gcp-integ-oidc-provider ]]
GCP_STAGING_OIDC_ACCOUNT: $[[ inputs.gcp-staging-oidc-account ]]
GCP_STAGING_OIDC_PROVIDER: $[[ inputs.gcp-staging-oidc-provider ]]
GCP_PROD_OIDC_ACCOUNT: $[[ inputs.gcp-prod-oidc-account ]]
GCP_PROD_OIDC_PROVIDER: $[[ inputs.gcp-prod-oidc-provider ]]
K8S_KUBECTL_IMAGE: $[[ inputs.kubectl-image ]]
.gcp-provider-auth:
before_script:
- echo "Installing GCP authentication with env GOOGLE_APPLICATION_CREDENTIALS file"
- echo $GCP_JWT > "$CI_BUILDS_DIR/.auth_token.jwt"
- |-
if [[ "$ENV_TYPE" ]]
then
case "$ENV_TYPE" in
review*)
env_prefix=REVIEW;;
integ*)
env_prefix=INTEG;;
staging*)
env_prefix=STAGING;;
prod*)
env_prefix=PROD;;
*)
;;
esac
env_oidc_provider=$(eval echo "\$GCP_${env_prefix}_OIDC_PROVIDER")
env_oidc_account=$(eval echo "\$GCP_${env_prefix}_OIDC_ACCOUNT")
fi
oidc_provider="${env_oidc_provider:-$GCP_OIDC_PROVIDER}"
oidc_account="${env_oidc_account:-$GCP_OIDC_ACCOUNT}"
- |-
cat << EOF > "$CI_BUILDS_DIR/google_application_credentials.json"
{
"type": "external_account",
"audience": "//iam.googleapis.com/${oidc_provider}",
"subject_token_type": "urn:ietf:params:oauth:token-type:jwt",
"token_url": "https://sts.googleapis.com/v1/token",
"credential_source": {
"file": "$CI_BUILDS_DIR/.auth_token.jwt"
},
"service_account_impersonation_url": "https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/${oidc_account}:generateAccessToken"
}
EOF
- export GOOGLE_APPLICATION_CREDENTIALS="$CI_BUILDS_DIR/google_application_credentials.json"
.k8s-deploy:
id_tokens:
GCP_JWT:
aud: "$GCP_OIDC_AUD"
before_script:
- !reference [.k8s-scripts]
- !reference [.gcp-provider-auth, before_script]
- install_ca_certs "${CUSTOM_CA_CERTS:-$DEFAULT_CA_CERTS}"
- k8s_login
.k8s-cleanup:
id_tokens:
GCP_JWT:
aud: "$GCP_OIDC_AUD"
before_script:
- !reference [.k8s-scripts]
- !reference [.gcp-provider-auth, before_script]
- install_ca_certs "${CUSTOM_CA_CERTS:-$DEFAULT_CA_CERTS}"
- k8s_login
\ No newline at end of file
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