Monitor Windows Certificate Store With Datadog

The Windows Certificate Storeis a critical component of any modern Windows environment. Certificates enable TLS encryption for Internet Information Services (IIS)-hosted applications, support certificate-based authentication in Active Directory, and help validate the identity of trusted Windows services. But if a certificate in your store expires, is revoked, or is part of a broken certificate chain, you risk instability and security gaps in your Windows environment. To ensure the continued security of your Windows infrastructure and applications, it's crucial to monitor your Windows Certificate Store to detect and even prevent certificate errors.

Datadog's Windows Certificate Store integration gives you visibility into expirations and broken certificate chains that threaten the availability and security of your Windows services. In this post, we'll show you how this integration helps you:

Every certificate in your Windows environment will eventually expire, and an expired certificate can prevent clients from accessing your services. Datadog's Windows Certificate Store integration highlights expired certificates so you can quickly renew them to restore the performance of your services and the trust of your users. By surfacing expired certificates, Datadog makes it easy for you to correlate them with TLS errors in your Windows Event Logsto confirm the certificate expirations as the cause of those errors.

In addition to identifying expired certificates, Datadog can notify you proactively when certificates are nearing expiration. Knowing in advance that a certificate will soon expire enables you to replace it before your service's security or availability are at risk. You can use the Windows Certificate Store monitor templateto easily set up this type of advance notification.

To create high-value, low-noise monitors in Datadog, you can create multiple versions of a monitor to use different thresholds for different certificate stores. For example, if a certficate expires in your development environment, you can notify a different team than you do for expirations in production. This enables you to address the issue with the appropriate process and urgency based on the environment affected. You can customize the notification message and recipients for each monitor, and optionally assign them to trigger custom workflows that automate your team's response to each alert.

If a certificate becomes compromised-for example, if its private key is leaked-the certificate authority (CA) that issued it can revoke it before it expires. Each CA, including your organization's enterprise CA, maintains a certificate revocation list (CRL)that identifies all of the certificates that the CA has revoked.

CRLs give clients a way to confirm that the certificates they rely on during a connection to your Windows environment haven't been revoked. For example, when a client initiates a handshake to connect to your Active Directory domain, it checks the CRL published by your enterprise CA. If any of the certificates involved in the handshake have been revoked, the client may be unable to connect to the domain.

An expired CRL puts the handshake process at risk. By monitoring the expiration status of the CRLs in your store, you can mitigate the risk and ensure that clients will have a current version of the list to reference.

To help you prevent service disruptions caused by expired CRLs, the Datadog Windows Certificate Store integration identifies expired CRLs so you can manually publish a fresh CRL to quickly mitigate any impact. You can also create a monitor to alert on soon-to-expire CRLs. Once alerted, you can check your enterprise CA's publication schedule to confirm whether the expiring certificate will be recreated before it expires. If not, you can manually publish a fresh CRL in time to prevent expiration and avoid any service disruption.

In addition to tracking the expirations of the certificates and CRLs in your Windows environment, you also need to monitor your certificate chains. Each certificate in your Windows Certificate Store is validated via a chain of trust, which links it with a trusted root CA, often through intermediate certificates. The chain ensures the validity of your end-entity certificates -for example, the ones IIS relies on to execute its HTTPS handshake with the browsers that visit your website. If the chain of trust is not intact-for example, if any of the certificates in the chain are expired, have been revoked, or fail policy checks-clients may be unable to access your Windows services.

By providing insight into certificate expirations, CRL freshness, and chain validity, Datadog's Windows Certificate Store integration helps Windows administrators, SREs, and security teams stay ahead of certificate-related issues. See the documentationto learn more about proactively monitoring the health and status of the certificates, CRLs, and chains of trust in your Windows environments. If you're not yet using Datadog, get started with a 14-day free trial.