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Patrick Buckley
9c74673fd4
The SSRF guard on OIDC endpoint URLs hard-refused any hostname resolving to a non-public address, which made it impossible to use a self-hosted IdP (Keycloak, Authentik, Dex) on an internal network — even though the login-flow issuer is operator-configured, i.e. trusted input. Add [oidc] allow_private_network in config.toml (or TURNSTONE_OIDC_ALLOW_PRIVATE_NETWORK), default off. When set, the issuer and its discovered endpoints may resolve to private-range, unique-local, CGNAT, and loopback addresses. Link-local, multicast, unspecified, and reserved ranges stay refused regardless — cloud metadata services live on link-local and no legitimate IdP does. The HTTPS requirement and same-origin endpoint checks are unchanged. The private-address refusal now raises OAuthSSRFPrivateAddressError, and the OIDC wrapper appends the remediation hint to the error message so the failure is self-service. mcp_oauth call sites — where endpoint URLs come from untrusted remote-server metadata — do not get the knob and keep the strict public-address rule.