feat: OIDC/OAuth2 authentication driver and SLO support#160
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Adds a complete OIDC/OAuth2 authentication integration for Horde:
- Horde_Core_Auth_Oidc: auth driver that validates sessions by checking
that OAuth2 tokens are still present in the repository. Authentication
itself is handled by OAuthAccountController via the /auth/oauth/login
flow. User listing via LDAP.
- PreLogoutHandlerInterface: contract for pre-logout hooks called by
LoginService::performLogout() before clearAuth(). Handlers may revoke
tokens, trigger SLO, or return a post-logout redirect URL.
- OidcPreLogoutHandler: implementation supporting three logout strategies:
- local: remove tokens from local storage only
- slo: remove tokens + redirect to IdP end_session_endpoint
- revoke_and_slo: revoke tokens at provider + SLO redirect
- OidcBackchannelLogoutController: endpoint for RFC 9470 back-channel
logout. Validates signed logout_token JWTs (RS256/ES256 via JWKS),
enforces jti replay protection, and removes the affected user's tokens.
- OidcHookHelper: static helpers centralising token refresh logic for
IMAP/SMTP/Sieve XOAUTH2 hooks.
- OAuthTokenRepositoryFactory: SQL-backed token repository wired through
the DI container, configurable via the admin UI.
- Unit tests for OidcPreLogoutHandler and OidcHookHelper.
- OIDC.md: installation and configuration guide.
Depends on:
- horde/Jwt: Jwk::toPublicKey() (merged)
- horde/Oauth: OAuth2Client::revokeToken() (merged)
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Adds a complete OIDC/OAuth2 authentication integration for Horde:
Horde_Core_Auth_Oidc: auth driver that validates sessions by checking that OAuth2 tokens are still present in the repository. Authentication itself is handled by OAuthAccountController via the /auth/oauth/login flow. User listing via LDAP.
PreLogoutHandlerInterface: contract for pre-logout hooks called by LoginService::performLogout() before clearAuth(). Handlers may revoke tokens, trigger SLO, or return a post-logout redirect URL.
OidcPreLogoutHandler: implementation supporting three logout strategies:
OidcBackchannelLogoutController: endpoint for RFC 9470 back-channel logout. Validates signed logout_token JWTs (RS256/ES256 via JWKS), enforces jti replay protection, and removes the affected user's tokens.
OidcHookHelper: static helpers centralising token refresh logic for IMAP/SMTP/Sieve XOAUTH2 hooks.
OAuthTokenRepositoryFactory: SQL-backed token repository wired through the DI container, configurable via the admin UI.
Unit tests for OidcPreLogoutHandler and OidcHookHelper.
OIDC.md: installation and configuration guide.
Depends on: