Cosign

Introduction

The Cosign plugin by Devtron enables secure signing of your container images, enhancing supply chain security. It authenticates your identity as the creator and ensures image integrity, allowing users to verify the source and detect any tampering. This provides greater assurance to developers incorporating your artifacts into their workflows.

Prerequisites

Before integrating the Cosign plugin, ensure that you have configured the Cosign and have a set of private and public keys to sign the container images.

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Steps

1. Go to Applications → Devtron Apps.

2. Click your application.

3. Go to App Configuration → Workflow Editor.

4. Click New Workflow and navigate to the Build and Deploy from Source Code.

5. Fill the required fields in the Create build pipeline window and navigate to the Post-build stage.

If you have already configured workflow, edit the build pipeline, and navigate to Post-build stage.

6. Under 'TASKS', click the + Add task button.

7. Click the Cosign plugin.

8. Enter the following user inputs with appropriate values.

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User Inputs

Task Name

Enter the name of your task

e.g., Signing of container images

Description

Add a brief explanation of the task and the reason for choosing the plugin. Include information for someone else to understand the purpose of the task.

e.g., The Cosign plugin is integrated for ensuring the authenticity of container images.

Input Variables

Variable	Format	Description	Sample Value
PrivateKeyFilePath	STRING	Path of private key file in Git repo	cosign/cosign.key
PostCommand	STRING	Command to run after image is signed by Cosign	cosign verify $DOCKER_IMAGE
ExtraArguments	STRING	Arguments for Cosign command	--certificate-identity=[e-mail]
CosignPassword	STRING	Password for Cosign private key	S3cur3P@ssw0rd123!
VariableAsPrivateKey	STRING	base64 encoded private-key	@{{COSIGN_PRIVATE_KEY}}
PreCommand	STRING	Command to get the required conditions to execute Cosign command	curl -sLJO https://raw.githubusercontent.com/devtron-labs/sampleRepo/branchName/private

Trigger/Skip Condition

Here you can set conditions to execute or skip the task. You can select Set trigger conditions for the execution of a task or Set skip conditions to skip the task.

Output Variables

Cosign will not be generating an output variable.

Click Update Pipeline.