feat: RFC 8705 mTLS Client Authentication #837
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Implement OAuth 2.0 Mutual-TLS Client Authentication and Certificate-Bound Access Tokens as specified in RFC 8705. Features: - tls_client_auth: PKI-based client authentication with CA chain validation - self_signed_tls_client_auth: Self-signed certificate authentication - Certificate-bound access tokens with cnf claim (x5t#S256) - Policy OID and EKU validation support - Reverse proxy certificate header support - LRU caching for DN parsing and thumbprint calculation - Discovery metadata output (tls_client_certificate_bound_access_tokens, mtls_endpoint_aliases) Token endpoints with mTLS support: - Token endpoint (code exchange, refresh, client_credentials) - Token exchange endpoint - JWT profile endpoint - Introspection endpoint - Revocation endpoint - UserInfo endpoint (certificate-bound token verification) Security: - Fail-closed model for mTLS clients - Startup validation of MTLSConfig - Certificate chain validation against Trust Store
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Closes #836
Summary
Implementation of RFC 8705 (OAuth 2.0 Mutual-TLS Client Authentication and Certificate-Bound Access Tokens).
Features
tls_client_auth- PKI-based client authentication with CA chain validationself_signed_tls_client_auth- Self-signed certificate authenticationcnfclaim withx5t#S256thumbprintChanges
pkg/op/mtls.gowith core mTLS implementation (~714 lines)pkg/op/mtls_test.go(114 tests)Test plan