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Andrew Martinez 8297a817b7 fixes #3734 enforce client certificate proof-of-possession for OIDC sessions (#3805)
* fixes #3734 enforce client certificate proof-of-possession for OIDC sessions

- adds verifyCertProofOfPossession() in resolveOidcSession() to require
  TLS client cert matching a z_cfs fingerprint or SPIFFE ID when the
  OIDC token was issued with cert bindings
- adds z_cae (CertAllowExpired) claim from auth policy, propagated
  through token issuance and refresh
- adds TrustCache.VerifyClientCert() with tiered pool matching
  (first-party roots, trust anchors, third-party) and TTL cache
- adds WrapIdentityWithCertValidation() on the router to verify client
  certs at the TLS level against RDM PublicKeys
- adds IsFirstPartyCert() on the router to gate SPIFFE ID matching by
  checking whether the cert chains to the controller root CA
- adds VerifySpiffeId() in common/spiffehlp with SpiffeMatchApiSession,
  SpiffeMatchIdentity, and SpiffeMatchNone return types
- adds SPIFFE IDs to OTT and token enrollment certs (/identity/<id>)
- enforces cert expiry by match type: API session certs must be valid,
  fingerprint-matched certs respect z_cae, legacy sessions skip checks
- shallow-copies leaf certs before overriding time fields in all cert
  verification paths to avoid races on shared x509.Certificate pointers
- fixes controllerRootCache setting inited=true before the ctrl channel
  is available, which permanently cached the failure
2026-04-23 12:00:46 -04:00
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