Binary authorization module and example

.gitignore

@@ -28,4 +28,6 @@ fast/stages/**/terraform-*.auto.tfvars.json
 fast/stages/**/0*.auto.tfvars*
 **/node_modules
 fast/stages/**/globals.auto.tfvars.json
-cloud_sql_proxy
+cloud_sql_proxy
+examples/cloud-operations/binauthz/tenant-setup.yaml
+examples/cloud-operations/binauthz/app/app.yaml

examples/cloud-operations/binauthz/README.md

@@ -0,0 +1,127 @@
+# Binary Authorization
+
+The following example shows to how to create a CI and a CD pipeline in Cloud Build for the deployment of an application to a private GKE cluster with unrestricted access to a public endpoint. The example enables a Binary Authorization policy in the project so only images that have been attested can be deployed to the cluster. The attestations are created using a cryptographic key pair that has been provisioned in KMS.
+
+The diagram below depicts the architecture used in the example.
+
+![Architecture](diagram.png)
+
+The CI and CD pipelines are implemented as Cloud Build triggers that run with a user-specified service account. 
+
+The CI pipeline does the following:
+
+* Builds and pushes the image to Artifact registry
+* Creates an attestation for the image.
+
+The CD pipeline deploys the application to the cluster.
+
+## 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=examples%2Fcloud-operations%2Fbinauthz), then go through the following steps to create resources:
+
+* `terraform init`
+* `terraform apply -var project_id=my-project-id`
+
+WARNING: The example requires the activation of the Binary Authorization API. That API does not support authentication with user credentials. A service account will need to be used to run the example
+
+## Testing the example
+
+Once the resources have been created, do the following to verify that everything works as expected.
+
+1. Fetch the cluster credentials
+
+        gcloud container clusters get-credentials cluster --project <PROJECT_ID>
+
+2. Apply the manifest tenant-setup.yaml available in your work directory.
+
+        kubectl apply -f tenant-setup.yaml
+
+   By applying that manifest thw following is created:
+
+    * A namespace called "apis". This is the namespace where the application will be deployed. 
+    * A Role and a RoleBinding in previously created namespace so the service account that has been configured for the CD pipeline trigger in Cloud Build is able to deploy the kubernetes application to that namespace.
+
+3. Change to the image subdirectory in your work directory
+
+        cd <WORK_DIR>/image 
+
+4. Run the following commands:
+
+        git init
+        git remote add origin ssh://<USER>:2022/p/<PROJECT_ID>/r/image
+        git push -u origin main
+
+4. In the Cloud Build > History section in the Google Cloud console you should see a job running. That job is build the image, pushing to Artifact Registry and creating an attestation.
+
+    Once the job finishes copy the digest of the image that is displayed in the Cloud Build job output.
+
+5. Change to the app subdirectory in your working directory.
+
+        cd <WORK_DIR>/app
+
+6. Edit the app.yaml file and replace the string DIGEST with the value you copied before.
+
+7. Run the following commands:
+
+        git init
+        git remote add origin ssh://<USER>:2022/p/<PROJECT_ID>/r/app
+        git push -u origin main
+
+8. In the Cloud Build > History section in the Google Cloud console you should see a job running. The job will deploy the application to the cluster.
+
+9. Go to the Kubernetes Engine > Workloads section to check that the deployment was successful and that the Binary Authorization admissions controller webhook did not block the deployment.
+
+10. Change to the working directory and try to deploy an image that has not been attested.
+
+        cat <<EOF | kubectl apply -f -
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+        name: nginx-deployment
+        spec:
+        selector:
+            matchLabels:
+            app: nginx
+        replicas: 2 
+        template:
+            metadata:
+            labels:
+                app: nginx
+            spec:
+            containers:
+            - name: nginx
+                image: gcr.io/google-containers/nginx:latest
+                ports:
+                - containerPort: 80
+        EOF
+
+
+9. Go to the Kubernetes Engine > Workloads section to check that that the Binary Authorization admissions controller webhook did not block the deployment.
+
+The application deployed to the cluster is an RESTful API that enables managing Google Cloud storage buckets in the project. Workload identity is used so the app can interact with the Google Cloud Storage API.
+
+Once done testing, you can clean up resources by running `terraform destroy`.
+<!-- BEGIN TFDOC -->
+
+## Variables
+
+| name | description | type | required | default |
+|---|---|:---:|:---:|:---:|
+| [project_id](variables.tf#L26) | Project ID. | <code>string</code> | ✓ |  |
+| [master_cidr_block](variables.tf#L49) | Master CIDR block. | <code>string</code> |  | <code>&#34;10.0.0.0&#47;28&#34;</code> |
+| [pods_cidr_block](variables.tf#L37) | Pods CIDR block. | <code>string</code> |  | <code>&#34;172.16.0.0&#47;20&#34;</code> |
+| [prefix](variables.tf#L31) | Prefix for resources created. | <code>string</code> |  | <code>null</code> |
+| [project_create](variables.tf#L17) | Parameters for the creation of the new project. | <code title="object&#40;&#123;&#10;  billing_account_id &#61; string&#10;  parent             &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [region](variables.tf#L61) | Region. | <code>string</code> |  | <code>&#34;europe-west1&#34;</code> |
+| [services_cidr_block](variables.tf#L43) | Services CIDR block. | <code>string</code> |  | <code>&#34;192.168.0.0&#47;24&#34;</code> |
+| [subnet_cidr_block](variables.tf#L55) | Subnet CIDR block. | <code>string</code> |  | <code>&#34;10.0.1.0&#47;24&#34;</code> |
+| [zone](variables.tf#L67) | Zone. | <code>string</code> |  | <code>&#34;europe-west1-c&#34;</code> |
+
+## Outputs
+
+| name | description | sensitive |
+|---|---|:---:|
+| [app_repo_url](outputs.tf#L22) | App source repository url. |  |
+| [image_repo_url](outputs.tf#L17) | Image source repository url. |  |
+
+<!-- END TFDOC -->

examples/cloud-operations/binauthz/image/.dockerignore

@@ -0,0 +1 @@
+node_modules

examples/cloud-operations/binauthz/image/.gitignore

@@ -0,0 +1 @@
+node_modules/**

examples/cloud-operations/binauthz/image/Dockerfile

@@ -0,0 +1,25 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY ["package.json", "package-lock.json*", "./"]
+
+RUN npm install
+
+COPY . .
+
+CMD [ "node", "index.js" ]

examples/cloud-operations/binauthz/image/README.md

@@ -0,0 +1,27 @@
+# Storage API
+
+This application it is a RESTful API that let's you manage the Google Cloud Storage buckets available is a project. In order to do so the application needs to authenticate with a service account that has been granted the Storage Admin (`roles/storage.admin`) role. 
+
+Find below the operations that can be performed using it:
+
+* Get buckets in project
+
+        curl -v http://localhost:3000/buckets
+
+* Get files in bucket
+
+        curl -v http://localhost:3000/buckets/BUCKET_NAME
+
+* Create a bucket
+
+        curl -v http://localhost:3000/buckets \
+        -H'Content-Type: application/json' \
+        -d  @- <<EOF
+        {
+            "name": "BUCKET_NAME"
+        }
+        EOF
+
+* Delete bucket
+
+        curl -v -X DELETE http://localhost:3000/buckets/BUCKET_NAME

examples/cloud-operations/binauthz/image/cloudbuild.yaml

@@ -0,0 +1,40 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+steps:
+  - id: 'Build image and push it to artifact registry'
+    name: 'gcr.io/kaniko-project/executor:latest'
+    args:
+      - '--destination=${_IMAGE}:${COMMIT_SHA}'
+      - '--cache=true'
+      - '--cache-ttl=6h'
+  - id: 'Create and sign attestation'
+    name: 'gcr.io/google.com/cloudsdktool/cloud-sdk:latest'
+    entrypoint: 'bash'
+    args:
+      - '-eEuo'
+      - 'pipefail'
+      - '-c'
+      - |
+          set -x
+          DIGEST=$(gcloud container images describe ${_IMAGE}:${COMMIT_SHA} \
+          --format 'value(image_summary.digest)' \
+          --project ${PROJECT_ID})
+          gcloud beta container binauthz attestations sign-and-create \
+          --project="${PROJECT_ID}" \
+          --artifact-url="${_IMAGE}@$${DIGEST}" \
+          --attestor="${_ATTESTOR}" \
+          --keyversion="${_KEY_VERSION}"     
+options:
+ logging: CLOUD_LOGGING_ONLY

examples/cloud-operations/binauthz/image/index.js

@@ -0,0 +1,81 @@
+/**
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const express = require('express');
+const app = express();
+const { Storage } = require('@google-cloud/storage');
+
+const PORT = 3000;
+const PROJECT_ID = process.env.PROJECT_ID;
+
+const storage = new Storage();
+
+
+app.use(express.json());
+app.set('json spaces', 2)
+
+app.get('/buckets', async (req, res) => {
+    try {
+        const [buckets] = await storage.getBuckets();
+        res.json(buckets.map(bucket => bucket.name));
+    } catch (error) {
+        res.status(500).json({
+            message: `An error occurred trying to fetch the buckets in project: ${error}`
+        });
+    }
+});
+
+app.get('/buckets/:name', async (req, res) => {
+    const name = req.params.name;
+    try {
+        const [files] = await storage.bucket(name).getFiles();
+        res.json(files.map(file => file.name));
+    } catch (error) {
+        res.status(500).json({
+            message: `An error occurred fetch the files in ${name} bucket: ${error}`
+        });
+    }
+});
+
+app.post('/buckets', async (req, res) => {
+    const name = req.body.name;
+    try {
+        const [bucket] = await storage.createBucket(name);
+        res.status(201).json({
+            "name": bucket.name
+        });
+    } catch (error) {
+        res.status(500).json({
+            message: `An error occurred trying to create ${name} bucket: ${error}`
+        });
+    }
+});
+
+app.delete('/buckets/:name', async (req, res) => {
+    const name = req.params.name;
+    try {
+        await storage.bucket(name).delete();
+        res.send()
+    } catch (error) {
+        res.status(500).json({
+            message: `An error occurred trying to delete ${name} bucket: ${error}`
+        });
+    }
+});
+
+app.listen(PORT, () => {
+    console.log(`App listening on port ${PORT}`)
+})