Securing MCP Servers with Keycloak and RFC8693
mhrittik · reddit · 2026-07-14
A technical guide on building secure MCP Servers, focusing on implementing token tiering and permission isolation using Keycloak + Go + RFC 8693 token exchange.
The core of the author's approach includes:
- Generating short-lived tokens tailored to specific resources/roles via token exchange
- Separating read and write permissions and restricting access scope using audience-bound tokens
- Aiming to make the MCP server more secure within agentic call chains
- Teasing a follow-up post on enforcement at the agent gateway level
Overall, it's a practical security implementation for MCP/agent infrastructure, rather than a conceptual overview.
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