OAuth & Security — Production & Sec
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OAuth & Security
OAuth 2.1 Authorization over Streamable HTTP
When running local stdio servers, access relies on local OS process permissions. Once you deploy an MCP Server over Streamable HTTP, the MCP specification mandates a rigorous OAuth 2.1 security architecture where the MCP server acts strictly as an OAuth 2.1 Resource Server:
- Protected Resource Metadata (RFC 9728): Unauthenticated requests receive
401 Unauthorizedwith aWWW-Authenticateheader pointing to/.well-known/oauth-protected-resource, telling clients which Authorization Server(s) and scopes protect the MCP endpoint. - Authorization Server Discovery (RFC 8414 & OIDC 1.0): Clients inspect
/.well-known/oauth-authorization-serveror/.well-known/openid-configurationto locate authorization, token, and JWKS endpoints automatically. - Client ID Metadata Documents (CIMD): Introduced in
2025-11-25(and deprecating RFC 7591 Dynamic Client Registration in2026-07-28), clients identify themselves using an HTTPS URL as theirclient_idthat hosts a signed/verified client metadata JSON document. - Mandatory PKCE & Resource Indicators (RFC 8707): Clients execute OAuth 2.1 with PKCE and pass the
resourceparameter (e.g.,resource=https://mcp.acme.com/mcp) to bind the minted Bearer token strictly to that MCP server's audience—preventing confused-deputy token passthrough to downstream APIs.
🔒 Security Invariant (No Token Passthrough): An MCP server MUST validate that incoming Bearer tokens were explicitly issued for its own canonical URI (RFC 8707 audience check) and MUST NEVER blindly forward a client's MCP access token to upstream APIs.
⌨ HANDS-ON LABAuthenticate Remote Client with OAuth Bearer
⭐ +150 XPAuthorize against an enterprise MCP OAuth 2.1 protected endpoint with a Bearer token.
1POST to the enterprise Streamable HTTP /mcp endpoint with an Authorization Bearer header.
OBJECTIVE 1 / 1 — type "hint" if stuck
🧪 Knowledge Check
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What protocol stack is standardized for securing remote Streamable HTTP MCP servers?
Basic Auth over plain text
OAuth 2.1 with PKCE, RFC 9728 Protected Resource Metadata, and RFC 8707 Resource Indicators
IP Whitelisting only
Custom cryptographic handshakes