What is an API Credential?

What is an API Credential in cloud hosting?

An API credential is authentication information that identifies and authorizes a user or application to access cloud services programmatically. Instead of logging in through a web interface, API credentials allow scripts, applications, and automation tools to communicate directly with cloud platform APIs.

API credentials typically consist of two components: an identifier (such as a username, access key ID, or application ID) and a secret (such as a password, secret key, or token). The cloud platform uses these credentials to verify who is making the request and what actions they are permitted to perform.

Related Terms

Keystone: The OpenStack identity service that issues and validates API credentials, such as tokens generated after successful authentication.
User: An identity within a cloud project that owns API credentials, such as a developer account or service account used for automation.
Identity Management: The system that controls authentication and authorization policies, such as password requirements and credential expiration rules.
Project: A container that defines the scope of API credential permissions, such as limiting which resources the credentials can access.

Why API Credentials Exist

Cloud platforms expose their functionality through APIs, allowing users to create instances, manage networks, and configure storage without using a graphical interface. However, these APIs need a way to verify that requests come from authorized users. API credentials solve this problem by providing machine-readable authentication information.

Without API credentials, every automated task would require manual login through a web browser. This would make automation impossible. Scheduled backups, deployment scripts, and monitoring systems all depend on API credentials to authenticate without human intervention.

API credentials also enable fine-grained access control. A cloud administrator can create credentials with limited permissions for specific tasks. For example, a backup script might receive credentials that can only read data and create snapshots, not delete resources or modify configurations.

What Do API Credentials Actually Do?

Authenticate API requests by proving the identity of the caller to the cloud platform
Authorize actions based on the permissions associated with the user or role
Enable programmatic access to cloud services from scripts, applications, and command-line tools
Allow non-interactive authentication for automated processes that run without human input
Provide an audit trail by logging which credentials performed which actions
Support different permission levels by allowing administrators to create credentials with restricted access

When Would I Use an API Credential?

You would use an API credential when automating cloud operations. If you are writing a script to deploy instances, a CI/CD pipeline to push application updates, or a monitoring tool that checks resource status, you need API credentials to authenticate those requests.

API credentials are also necessary when using command-line tools like the OpenStack CLI. These tools require credentials to communicate with the cloud API on your behalf.

Third-party applications and services that integrate with your cloud environment also require API credentials. For example, a backup service that copies your volumes to external storage needs credentials to access your cloud resources.

When Would I NOT Use an API Credential?

You would not use an API credential for interactive tasks that you can complete through the web dashboard. If you are manually creating a single instance or checking your resource usage once, logging into the Horizon Dashboard is simpler and safer than setting up API credentials.

You should not use your personal API credentials in shared environments or scripts that multiple people run. Instead, create dedicated service credentials with only the permissions necessary for the specific task.

Avoid embedding API credentials directly in application source code. If the code repository is compromised or accidentally made public, attackers gain access to your cloud resources. Use environment variables, secret management systems, or credential files with restricted permissions instead.

Real-World Example

Company A runs a web application hosted on cloud instances. Their deployment team uses a CI/CD pipeline that automatically deploys new application versions whenever developers push code changes.

The CI/CD system needs to communicate with the cloud API to pull the latest container image, stop the old instance, launch a new instance with the updated application, and attach a floating IP. Company A creates a dedicated API credential for the deployment pipeline. This credential has permission to manage instances in the production project but cannot access billing information or modify network configurations.

When the pipeline runs, it uses these credentials to authenticate each API request. The cloud platform logs every action, providing an audit trail. If the pipeline credentials are ever compromised, Company A can revoke them immediately without affecting other users or systems.

Frequently Asked Questions

What types of API credentials exist in cloud platforms?

Cloud platforms commonly support several credential types. Username and password combinations work for basic authentication. Application credentials allow long-lived access tokens for automation. API keys provide simple identifier-secret pairs. EC2-style credentials offer compatibility with AWS tools. The best choice depends on your use case and security requirements.

How often should I rotate API credentials?

Rotate API credentials regularly to limit the impact of potential exposure. Many organizations rotate credentials every 90 days or less. Some security frameworks require more frequent rotation. You should also rotate credentials immediately if you suspect they have been compromised or if an employee with access leaves the organization.

Can I restrict what an API credential can access?

Yes. Most cloud platforms allow you to create credentials with specific role assignments and project scope. You can limit credentials to read-only access, restrict them to specific services, or confine them to particular projects. Following the principle of least privilege, grant only the permissions necessary for the intended purpose.

What happens if my API credential is stolen?

An attacker with your API credential can perform any action that credential is authorized to perform. This could include creating instances, deleting data, or accessing sensitive information. Revoke compromised credentials immediately through the cloud dashboard or API. Then create new credentials and update any systems that used the old ones.

Should I use my personal credentials for automation scripts?

No. Create dedicated application credentials or service accounts for automation. Personal credentials typically have broad permissions across the entire account. If a script using personal credentials is compromised, the attacker gains access to everything you can access. Dedicated credentials with limited scope reduce this risk.

Summary

An API credential is authentication information that allows programmatic access to cloud services through an API
API credentials consist of an identifier and a secret that the cloud platform uses to verify identity
Automation scripts, CI/CD pipelines, and command-line tools require API credentials to authenticate with cloud APIs
Best practices include rotating credentials regularly, using dedicated credentials for each purpose, and granting only necessary permissions
Never embed API credentials directly in source code; use environment variables or secret management systems instead