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Concepts

Kerberos SVN Integration for Secure, Password-Free Authentication

Andrios Robert

• 1 min read

Not because it was wrong, but because it wasn’t the right kind of proof. This is where Kerberos and SVN meet—where authentication moves past plain text and into a secure ticket dance that keeps source code safe.

Kerberos SVN integration solves a core problem: ensuring that every commit and checkout in Subversion is tied to a verified identity without passing secrets over the wire. Kerberos is a network authentication protocol using time-based tickets instead of reusable passwords. When combined with SVN, it eliminates the weak link of stored credentials while streamlining developer workflows. The result: no password prompts for trusted users, yet all activity is cryptographically verified.

In practice, Kerberos SVN works through GSSAPI (Generic Security Services Application Program Interface). Apache’s mod_auth_kerb or similar modules hook directly into the SVN repository served over HTTP(S). Users gain Kerberos tickets via kinit, SVN’s HTTP client passes those tickets silently, and the server confirms them against a Key Distribution Center (KDC). This handshake protects operations like svn commit or svn update without leaking passwords or session tokens.

Key benefits of Kerberos SVN:

  • Centralized authentication controlled by Active Directory or MIT Kerberos.
  • No password storage in SVN configuration files.
  • Resistance to man-in-the-middle and replay attacks.
  • Seamless single sign-on (SSO) for developers across systems.

To configure:

  1. Install Kerberos libraries on both client and server machines.
  2. Configure Apache with mod_auth_kerb or mod_auth_gssapi.
  3. Set SVN repository access rules in Location blocks with AuthType Kerberos.
  4. Join both server and client machines to the same Kerberos realm.
  5. Test with svn checkout after acquiring a ticket with kinit.

Common pitfalls include mismatched realm names, clock skew greater than five minutes, and improper SPN (Service Principal Name) registration. Addressing these early ensures smooth Kerberos SVN integration.

Secure source control isn’t optional. With Kerberos, SVN gains a layer of trust based on strong, proven cryptography, protecting commits without slowing development.

See how fast this can be set up—try it live in minutes at hoop.dev.