Policy v2

This release introduces a new policy implementation. The new policy is a complete rewrite, and it introduces some significant quality and consistency improvements. In principle, there are not really any new features, but some long standing bugs should have been resolved, or be easier to fix in the future. The new policy code passes all of our tests.

Changes

• The policy is validated and "resolved" when loading, providing errors for invalid rules and conditions.
  • Previously this was done as a mix between load and runtime (when it was applied to a node).
  • This means that when you convert the first time, what was previously a policy that loaded, but failed at runtime, will now fail at load time.
• Error messages should be more descriptive and informative.
  • There is still work to be here, but it is already improved with "typing" (e.g. only Users can be put in Groups)
• All users must contain an @ character.
  • If your user naturally contains and @, like an email, this will just work.
  • If its based on usernames, or other identifiers not containing an @, an @ should be appended at the end. For example, if your user is john, it must be written as john@ in the policy.

SSH

The SSH policy has been reworked to be more consistent with the rest of the policy. In addition, several inconsistencies between our implementation and Tailscale's upstream has been closed and this might be a breaking change for some users. Please refer to the upstream documentation for more information on which types are allowed in src, dst and users.

There is one large inconsistency left, we allow * as a destination as we currently do not support autogroup:self, autogroup:member and autogroup:tagged. The support for * will be removed when we have support for the autogroups.

Current state

The new policy is passing all tests, both integration and unit tests. This does not mean it is perfect, but it is a good start. Corner cases that is currently working in v1 and not tested might be broken in v2 (and vice versa).

We do need help testing this code

Other breaking changes

• Disallow server_url and base_domain to be equal #2544
• Return full user in API for pre auth keys instead of string #2542
• Pre auth key API/CLI now uses ID over username #2542

Changes

• Use Go 1.24 #2427
• Add headscale policy check command to check policy #2553
• oidc.map_legacy_users and oidc.strip_email_domain has been removed #2411
• Add more information to /debug endpoint #2420
  • It is now possible to inspect running goroutines and take profiles
  • View of config, policy, filter, ssh policy per node, connected nodes and DERPmap
• OIDC: Fetch UserInfo to get EmailVerified if necessary #2493
  • If a OIDC provider doesn't include the email_verified claim in its ID tokens, Headscale will attempt to get it from the UserInfo endpoint.
• OIDC: Try to populate name, email and username from UserInfo #2545
• Improve performance by only querying relevant nodes from the database for node updates #2509
• node FQDNs in the netmap will now contain a dot (".") at the end. This aligns with behaviour of tailscale.com #2503
• Restore support for "Override local DNS" #2438
• Add documentation for routes #2496

Changelog

• 8c7e65061649c62a5323ad13d6067daa4e34734b Remove map_legacy_users from example configuration (#2590)
• d7a503a34effa188e9bb27cb6b0fad2002112fb0 changelog: entry for 0.26 (#2594)
• 62b489dc686c090a025329673c67e28f441d14e1 fix: change FormatUint base from 64 to 10 in preauthkeys list command (#2588)
• 2dc2f3b3f0e0efcb5257379dec7ad1b4b09f8945 users: harden, test, and add cleaner of identifier (#2593)