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Commit2410fd8

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feat(oauth2): implement RFC 6750 Bearer Token Support for MCP compliance
- Add RFC 6750 bearer token extraction to APITokenFromRequest as fallback methods- Support Authorization: Bearer <token> header and access_token query parameter- Maintain backward compatibility by prioritizing existing custom methods first- Add WWW-Authenticate headers to 401/403 responses per RFC 6750- Update Protected Resource Metadata to advertise bearer_methods_supported- Add comprehensive test suite for RFC 6750 compliance in rfc6750_test.go- Update MCP test scripts with bearer token authentication tests- Enhance CLAUDE.md with improved Go LSP tool usage guidelinesImplements RFC 6750 Section 2.1 (Authorization Request Header Field) and 2.3 (URI Query Parameter).Maintains full backward compatibility with existing Coder authentication methods.Completes major MCP OAuth2 compliance milestone.Change-Id: Ic9c9057153b40728ad91b377d753a7ffd566add7Signed-off-by: Thomas Kosiewski <tk@coder.com>
1 parentdb5e215 commit2410fd8

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7 files changed

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-7
lines changed

7 files changed

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‎coderd/httpmw/apikey.go‎

Lines changed: 42 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -214,6 +214,31 @@ func ExtractAPIKey(rw http.ResponseWriter, r *http.Request, cfg ExtractAPIKeyCon
214214
returnnil,nil,false
215215
}
216216

217+
// Add WWW-Authenticate header for 401/403 responses (RFC 6750)
218+
ifcode==http.StatusUnauthorized||code==http.StatusForbidden {
219+
varwwwAuthstring
220+
221+
switchcode {
222+
casehttp.StatusUnauthorized:
223+
// Map 401 to invalid_token with specific error descriptions
224+
switch {
225+
casestrings.Contains(response.Message,"expired")||strings.Contains(response.Detail,"expired"):
226+
wwwAuth=`Bearer realm="coder", error="invalid_token", error_description="The access token has expired"`
227+
casestrings.Contains(response.Message,"audience")||strings.Contains(response.Message,"mismatch"):
228+
wwwAuth=`Bearer realm="coder", error="invalid_token", error_description="The access token audience does not match this resource"`
229+
default:
230+
wwwAuth=`Bearer realm="coder", error="invalid_token", error_description="The access token is invalid"`
231+
}
232+
casehttp.StatusForbidden:
233+
// Map 403 to insufficient_scope per RFC 6750
234+
wwwAuth=`Bearer realm="coder", error="insufficient_scope", error_description="The request requires higher privileges than provided by the access token"`
235+
default:
236+
wwwAuth=`Bearer realm="coder"`
237+
}
238+
239+
rw.Header().Set("WWW-Authenticate",wwwAuth)
240+
}
241+
217242
httpapi.Write(ctx,rw,code,response)
218243
returnnil,nil,false
219244
}
@@ -700,9 +725,14 @@ func UserRBACSubject(ctx context.Context, db database.Store, userID uuid.UUID, s
700725
// 1: The cookie
701726
// 2. The coder_session_token query parameter
702727
// 3. The custom auth header
728+
// 4. RFC 6750 Authorization: Bearer header
729+
// 5. RFC 6750 access_token query parameter
703730
//
704731
// API tokens for apps are read from workspaceapps/cookies.go.
705732
funcAPITokenFromRequest(r*http.Request)string {
733+
// Prioritize existing Coder custom authentication methods first
734+
// to maintain backward compatibility and existing behavior
735+
706736
cookie,err:=r.Cookie(codersdk.SessionTokenCookie)
707737
iferr==nil&&cookie.Value!="" {
708738
returncookie.Value
@@ -718,7 +748,18 @@ func APITokenFromRequest(r *http.Request) string {
718748
returnheaderValue
719749
}
720750

721-
// TODO(ThomasK33): Implement RFC 6750
751+
// RFC 6750 Bearer Token support (added as fallback methods)
752+
// Check Authorization: Bearer <token> header (case-insensitive per RFC 6750)
753+
authHeader:=r.Header.Get("Authorization")
754+
ifstrings.HasPrefix(strings.ToLower(authHeader),"bearer ") {
755+
returnauthHeader[7:]// Skip "Bearer " (7 characters)
756+
}
757+
758+
// Check access_token query parameter
759+
accessToken:=r.URL.Query().Get("access_token")
760+
ifaccessToken!="" {
761+
returnaccessToken
762+
}
722763

723764
return""
724765
}

‎coderd/httpmw/csrf.go‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -102,6 +102,12 @@ func CSRF(cookieCfg codersdk.HTTPCookieConfig) func(next http.Handler) http.Hand
102102
returntrue
103103
}
104104

105+
// RFC 6750 Bearer Token authentication is exempt from CSRF
106+
// as it uses custom headers that cannot be set by malicious sites
107+
ifauthHeader:=r.Header.Get("Authorization");strings.HasPrefix(strings.ToLower(authHeader),"bearer ") {
108+
returntrue
109+
}
110+
105111
// If the X-CSRF-TOKEN header is set, we can exempt the func if it's valid.
106112
// This is the CSRF check.
107113
sent:=r.Header.Get("X-CSRF-TOKEN")

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