Claude
d73620e305
- JWT bearer authentication via spring-boot-starter-oauth2-resource-server, validated against
an RSA keypair DemoJwtIssuer generates and signs with locally, so the whole module runs and
tests deterministically with no external Authorization Server.
- @PreAuthorize on @McpTool methods maps SCOPE_orders:read / SCOPE_orders:write to lookup_order
and refund_order -- confirmed empirically that method security actually applies to a bean the
MCP server autoconfiguration invokes via reflection, since it invokes the Spring-proxied bean.
- SecurityFilterChain requires authentication on every request, so tool discovery (initialize/
tools-list) is rejected before it ever reaches the MCP dispatcher -- no anonymous tool listing.
- ToolAuditAspect logs every tool call through MDC (subject, scopes, tool, outcome), pinned to
@Order(150) -- between AuthorizationInterceptorsOrder.PRE_FILTER (100) and PRE_AUTHORIZE (200)
-- so it wraps @PreAuthorize's interceptor and still logs denied calls, not only successful
ones. Verified with a real Logback ListAppender reading back real MDC contents.
Two real findings worth a note: Spring Boot 4.0 renamed spring-boot-starter-aop to
spring-boot-starter-aspectj (the old artifact stops existing after 4.0.0-M2); and Spring AI's
AbstractSyncMcpToolMethodCallback.createSyncErrorResult concatenates an exception's message with
its root cause's message, which duplicates the text when they're the same exception -- visible
directly in the captured output when @PreAuthorize denies a call ("Access Denied\nAccess Denied").
5/5 tests pass against a real running server over real Streamable HTTP, with real signed JWTs.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FtpJvZfg4nvLvtzgJTDWpB
11 lines
578 B
Plaintext
11 lines
578 B
Plaintext
# Calling initialize() with no Authorization header at all
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client.initialize() with no bearer token threw:
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java.lang.RuntimeException: Client failed to initialize by explicit API call
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caused by [0]: io.modelcontextprotocol.client.transport.McpHttpClientTransportAuthorizationException: Authorization error when sending message
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Spring Security's filter chain rejects the request with HTTP 401 before the
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DispatcherServlet ever hands it to the MCP server -- there is no 'anonymous tools/list'
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response to intercept, because the initialize handshake itself never completes.
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