All of the mid-session and step-up auth work

This commit is contained in:
Bob Dickinson 2026-07-02 16:35:31 -07:00
commit 562bdd00f1
23 changed files with 11437 additions and 1212 deletions

331
core/auth/challenge.ts Normal file
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@ -0,0 +1,331 @@
import { isUnauthorizedError } from "./utils.js";
/** Why authorization failed for this MCP interaction. */
export type AuthChallengeReason =
| "unauthorized"
| "token_expired"
| "insufficient_scope"
| "invalid_token";
/** Normalized challenge for handleAuthChallenge(). */
export interface AuthChallenge {
reason: AuthChallengeReason;
/** Scopes from the current challenge (step-up). */
requiredScopes?: string[];
/**
* For step-up (SEP-2350): union of previously requested scopes and requiredScopes.
* Set by handleAuthChallenge before re-authorization; not sent on the wire.
*/
authorizationScopes?: string[];
/** Resource indicator / MCP resource URL when known (EMA RFC 8707). */
resource?: string;
/** Resource authorization server audience when known. */
audience?: string;
/** Optional human-readable detail from server or SDK (for UI, not parsing). */
message?: string;
/** Optional UX hints when known (not used for ambient RPC replay). */
context?: {
method?: string;
toolName?: string;
};
/** Opaque raw hints for logging and forward-compatible parsers. */
raw?: {
httpStatus?: number;
wwwAuthenticate?: string;
};
}
export type AuthChallengeOutcome =
| { kind: "satisfied" }
| { kind: "interactive"; authorizationUrl: URL; challenge: AuthChallenge }
| { kind: "step_up_confirm"; challenge: AuthChallenge }
| { kind: "failed"; error: Error };
/** Placeholder URL when EMA step-up awaits in-app confirmation (no redirect yet). */
export const EMA_STEP_UP_PENDING_URL = new URL("mcp-inspector:ema-step-up");
export interface HandleAuthChallengeOptions {
/** User confirmed step-up in Inspector UI — run silent EMA re-mint / IdP redirect. */
confirmedStepUp?: boolean;
}
export interface ParseAuthChallengeContext {
method?: string;
toolName?: string;
}
export class AuthChallengeError extends Error {
readonly authChallenge: AuthChallenge;
readonly status: number;
constructor(
authChallenge: AuthChallenge,
status: number,
message?: string,
) {
super(message ?? `Auth challenge: ${authChallenge.reason}`);
this.name = "AuthChallengeError";
this.authChallenge = authChallenge;
this.status = status;
}
}
/** Thrown when interactive auth recovery was started and the caller should wait for callback. */
export class AuthRecoveryRequiredError extends Error {
readonly authorizationUrl: URL;
readonly authChallenge: AuthChallenge;
/** EMA insufficient_scope awaiting user confirmation in Inspector (no redirect yet). */
readonly emaStepUpConfirm?: boolean;
constructor(
authorizationUrl: URL,
authChallenge: AuthChallenge,
options?: { emaStepUpConfirm?: boolean },
) {
super("Interactive auth recovery required");
this.name = "AuthRecoveryRequiredError";
this.authorizationUrl = authorizationUrl;
this.authChallenge = authChallenge;
this.emaStepUpConfirm = options?.emaStepUpConfirm;
}
}
/**
* Connect-time failures the app can recover via OAuth redirect. These are not
* terminal connection errors — the UI should stay on "connecting" until the
* redirect or an explicit recovery failure.
*/
export function isConnectAuthRecoveryError(err: unknown): boolean {
if (err instanceof AuthRecoveryRequiredError) return true;
return isUnauthorizedError(err);
}
export interface WwwAuthenticateBearerParams {
error?: string;
scope?: string;
resourceMetadata?: string;
errorDescription?: string;
}
/** Parse the first `WWW-Authenticate: Bearer …` challenge (RFC 6750). */
export function parseWwwAuthenticateBearer(
header: string,
): WwwAuthenticateBearerParams {
const match = header.match(/Bearer\s+(.+)/i);
if (!match) {
return {};
}
const params: Record<string, string> = {};
const paramRegex = /([\w-]+)(?:="([^"]*)"|=([^\s,]+))?/g;
let m: RegExpExecArray | null;
while ((m = paramRegex.exec(match[1])) !== null) {
const value = m[2] ?? m[3];
if (value !== undefined) {
params[m[1].toLowerCase()] = value;
}
}
return {
error: params.error,
scope: params.scope,
resourceMetadata: params.resource_metadata,
errorDescription: params.error_description,
};
}
/** Split an OAuth scope string into individual scopes (space-separated). */
export function parseScopeString(scope: string | undefined): string[] {
if (!scope?.trim()) {
return [];
}
return scope.trim().split(/\s+/).filter(Boolean);
}
/**
* SEP-2350: union of previously requested scopes and scopes from the current challenge.
* Preserves order: previous scopes first, then any new required scopes.
*/
export function unionAuthorizationScopes(
previousScope: string | undefined,
requiredScopes: string[],
): string[] {
const seen = new Set<string>();
const result: string[] = [];
for (const scope of [
...parseScopeString(previousScope),
...requiredScopes.filter(Boolean),
]) {
if (!seen.has(scope)) {
seen.add(scope);
result.push(scope);
}
}
return result;
}
function reasonFromHttpResponse(
status: number,
bearer: WwwAuthenticateBearerParams,
): AuthChallengeReason {
if (status === 403) {
if (bearer.error === "insufficient_scope") {
return "insufficient_scope";
}
return "unauthorized";
}
if (bearer.error === "insufficient_scope") {
return "insufficient_scope";
}
if (bearer.error === "invalid_token") {
return "invalid_token";
}
// Bare 401 without a Bearer error code — treat as expired token for silent
// refresh / reauth UX (connect-time 401 uses isUnauthorizedError separately).
if (status === 401) {
return "token_expired";
}
return "unauthorized";
}
/**
* Build an AuthChallenge from an MCP HTTP response (401 / 403).
* Returns undefined when the response is not an auth challenge.
*/
export function parseAuthChallengeFromResponse(
response: Response,
context?: ParseAuthChallengeContext,
): AuthChallenge | undefined {
const status = response.status;
if (status !== 401 && status !== 403) {
return undefined;
}
const wwwAuthenticate = response.headers.get("WWW-Authenticate") ?? undefined;
const bearer = wwwAuthenticate
? parseWwwAuthenticateBearer(wwwAuthenticate)
: {};
const requiredScopes = parseScopeString(bearer.scope);
return {
reason: reasonFromHttpResponse(status, bearer),
...(requiredScopes.length > 0 ? { requiredScopes } : {}),
...(bearer.errorDescription ? { message: bearer.errorDescription } : {}),
...(context ? { context } : {}),
raw: {
httpStatus: status,
...(wwwAuthenticate ? { wwwAuthenticate } : {}),
},
};
}
/** Best-effort challenge extraction from SDK / transport errors. */
export function parseAuthChallengeFromError(
err: unknown,
context?: ParseAuthChallengeContext,
): AuthChallenge | undefined {
if (err instanceof AuthChallengeError) {
return err.authChallenge;
}
if (typeof err !== "object" || err === null) {
return undefined;
}
const authChallenge = (err as { authChallenge?: AuthChallenge })
.authChallenge;
if (authChallenge?.reason) {
return {
...authChallenge,
...(context
? {
context: {
...authChallenge.context,
...context,
},
}
: {}),
};
}
const status =
(err as { status?: number }).status ??
(err as { code?: number }).code;
if (status !== 401 && status !== 403) {
return undefined;
}
const wwwAuthenticate =
authChallenge?.raw?.wwwAuthenticate ??
(err as { wwwAuthenticate?: string }).wwwAuthenticate ??
(err as { headers?: { get?: (name: string) => string | null } }).headers
?.get?.("WWW-Authenticate") ??
undefined;
if (!wwwAuthenticate?.length) {
return undefined;
}
const bearer = parseWwwAuthenticateBearer(wwwAuthenticate);
const requiredScopes = parseScopeString(bearer.scope);
return {
reason: reasonFromHttpResponse(status, bearer),
...(requiredScopes.length > 0 ? { requiredScopes } : {}),
...(context ? { context } : {}),
raw: {
httpStatus: status,
wwwAuthenticate,
},
};
}
/**
* True for mid-session auth failures (HTTP 401 or 403 on MCP traffic).
* Connect-time 401 detection remains {@link isUnauthorizedError} in utils.ts.
*
* Bare HTTP status codes alone are not treated as auth challenges — require
* {@link AuthChallengeError}, an embedded `authChallenge`, or `WWW-Authenticate`.
*/
export function isAuthChallengeError(err: unknown): boolean {
if (err instanceof AuthChallengeError) {
return true;
}
if (typeof err !== "object" || err === null) {
return false;
}
const authChallenge = (err as { authChallenge?: AuthChallenge }).authChallenge;
if (authChallenge?.reason) {
return true;
}
const status =
(err as { status?: number }).status ?? (err as { code?: number }).code;
if (status !== 401 && status !== 403) {
return false;
}
const wwwAuthenticate =
authChallenge?.raw?.wwwAuthenticate ??
(err as { wwwAuthenticate?: string }).wwwAuthenticate ??
(err as { headers?: { get?: (name: string) => string | null } }).headers
?.get?.("WWW-Authenticate") ??
undefined;
return wwwAuthenticate !== undefined && wwwAuthenticate.length > 0;
}

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@ -19,7 +19,10 @@ export interface BuildOAuthConnectionStateParams {
flowState?: OAuthFlowState;
}
function isAccessTokenUsable(tokens: OAuthTokens | undefined): boolean {
/** True when persisted tokens include a non-expired access token (JWT exp when parseable). */
export function isAccessTokenUsable(
tokens: OAuthTokens | undefined,
): boolean {
if (!tokens?.access_token) return false;
return !isJwtExpired(tokens.access_token);
}

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@ -24,6 +24,12 @@ export type { BuildOAuthConnectionStateParams } from "./connection-state.js";
export { ensureCimdClientRegistration } from "./cimd.js";
export { mcpAuth, type McpAuthOptions, type McpAuthResult } from "./mcpAuth.js";
export {
computeScopeUnion,
isStrictScopeSuperset,
} from "./scopes.js";
// Storage
export type { OAuthStorage, IdpSessionState, SaveClientInformationOptions } from "./storage.js";
export { getServerSpecificKey, OAUTH_STORAGE_KEYS } from "./storage.js";
@ -49,9 +55,50 @@ export {
generateOAuthState,
parseOAuthState,
generateOAuthErrorDescription,
formatOAuthFailureDetail,
isUnauthorizedError,
} from "./utils.js";
export type {
AuthChallenge,
AuthChallengeReason,
AuthChallengeOutcome,
HandleAuthChallengeOptions,
ParseAuthChallengeContext,
WwwAuthenticateBearerParams,
} from "./challenge.js";
export {
AuthChallengeError,
AuthRecoveryRequiredError,
parseAuthChallengeFromError,
parseAuthChallengeFromResponse,
parseScopeString,
parseWwwAuthenticateBearer,
unionAuthorizationScopes,
isAuthChallengeError,
isConnectAuthRecoveryError,
EMA_STEP_UP_PENDING_URL,
} from "./challenge.js";
export {
isStandardOAuthStepUp,
isEmaStepUp,
isStepUpConfirmation,
stepUpConfirmMessage,
stepUpFollowUpMessage,
stepUpModalTitle,
stepUpAuthorizeActionLabel,
emaStepUpInProgressMessage,
emaStepUpSuccessMessage,
emaStepUpFailureMessage,
stepUpAdditionalScopes,
stepUpInsufficientScopeMessage,
oauthPreRedirectToastCopy,
isReAuthBannerReason,
reAuthBannerMessage,
type OAuthInteractiveAuthKind,
} from "./oauthUx.js";
// Discovery
export { discoverScopes } from "./discovery.js";

156
core/auth/mcpAuth.ts Normal file
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@ -0,0 +1,156 @@
/**
* v2-shaped OAuth orchestrator for standard MCP resource authorization.
*
* **Upgrade path:** On `@modelcontextprotocol/client` v2, replace this module
* with `export { auth as mcpAuth, type AuthOptions as McpAuthOptions } from
* "@modelcontextprotocol/client"` and delete `authorizeWithoutRefresh`.
*
* Until then, `mcpAuth` delegates to SDK v1 `auth()` except when
* `forceReauthorization: true` — then it runs discovery + `startAuthorization`
* (the same path v2 `auth()` takes when refresh cannot widen scope).
*/
import {
auth as sdkAuth,
discoverOAuthServerInfo,
isHttpsUrl,
registerClient,
selectResourceURL,
startAuthorization,
} from "@modelcontextprotocol/sdk/client/auth.js";
import type { OAuthClientProvider } from "@modelcontextprotocol/sdk/client/auth.js";
import type { FetchLike } from "@modelcontextprotocol/sdk/shared/transport.js";
import { InvalidClientMetadataError } from "@modelcontextprotocol/sdk/server/auth/errors.js";
export type McpAuthResult = "AUTHORIZED" | "REDIRECT";
/**
* Options aligned with v2 SDK `AuthOptions`. v2-only fields are accepted now
* and forwarded on upgrade; v1 passthrough ignores unsupported fields.
*/
export interface McpAuthOptions {
serverUrl: string | URL;
authorizationCode?: string;
/** RFC 9207 callback `iss` — forwarded on v2 upgrade; ignored by v1 SDK `auth()`. */
iss?: string;
scope?: string;
resourceMetadataUrl?: URL;
fetchFn?: FetchLike;
/** v2 SEP-2468 — ignored until SDK v2 upgrade. */
skipIssuerMetadataValidation?: boolean;
/**
* Skip refresh and start an authorization-code flow. Required for step-up
* when the union scope exceeds the current token grant (RFC 6749 §6).
*/
forceReauthorization?: boolean;
}
export async function mcpAuth(
provider: OAuthClientProvider,
options: McpAuthOptions,
): Promise<McpAuthResult> {
if (options.forceReauthorization) {
if (options.authorizationCode !== undefined) {
throw new Error(
"forceReauthorization cannot be combined with authorizationCode",
);
}
return authorizeWithoutRefresh(provider, options);
}
return sdkAuth(provider, {
serverUrl: options.serverUrl,
authorizationCode: options.authorizationCode,
scope: options.scope,
resourceMetadataUrl: options.resourceMetadataUrl,
fetchFn: options.fetchFn,
});
}
async function authorizeWithoutRefresh(
provider: OAuthClientProvider,
options: McpAuthOptions,
): Promise<"REDIRECT"> {
const { serverUrl, scope, resourceMetadataUrl, fetchFn } = options;
const serverInfo = await discoverOAuthServerInfo(serverUrl, {
resourceMetadataUrl,
fetchFn,
});
const {
authorizationServerUrl,
authorizationServerMetadata: metadata,
resourceMetadata,
} = serverInfo;
await provider.saveDiscoveryState?.({
authorizationServerUrl: String(authorizationServerUrl),
resourceMetadataUrl: resourceMetadataUrl?.toString(),
resourceMetadata,
authorizationServerMetadata: metadata,
});
const resource = await selectResourceURL(
serverUrl,
provider,
resourceMetadata,
);
const resolvedScope =
scope ||
resourceMetadata?.scopes_supported?.join(" ") ||
provider.clientMetadata.scope;
let clientInformation = await Promise.resolve(provider.clientInformation());
if (!clientInformation) {
const supportsUrlBasedClientId =
metadata?.client_id_metadata_document_supported === true;
const clientMetadataUrl = provider.clientMetadataUrl;
if (clientMetadataUrl && !isHttpsUrl(clientMetadataUrl)) {
throw new InvalidClientMetadataError(
`clientMetadataUrl must be a valid HTTPS URL with a non-root pathname, got: ${clientMetadataUrl}`,
);
}
const shouldUseUrlBasedClientId =
supportsUrlBasedClientId && clientMetadataUrl;
if (shouldUseUrlBasedClientId) {
clientInformation = { client_id: clientMetadataUrl };
await provider.saveClientInformation?.(clientInformation);
} else {
if (!provider.saveClientInformation) {
throw new Error(
"OAuth client information must be saveable for dynamic registration",
);
}
const fullInformation = await registerClient(authorizationServerUrl, {
metadata,
clientMetadata: provider.clientMetadata,
scope: resolvedScope,
fetchFn,
});
await provider.saveClientInformation(fullInformation);
clientInformation = fullInformation;
}
}
const state = provider.state ? await provider.state() : undefined;
const redirectUrl = provider.redirectUrl;
if (!redirectUrl) {
throw new Error("redirectUrl is required for authorization_code flow");
}
const { authorizationUrl, codeVerifier } = await startAuthorization(
authorizationServerUrl,
{
metadata,
clientInformation,
state,
redirectUrl,
scope: resolvedScope,
resource,
},
);
await provider.saveCodeVerifier(codeVerifier);
await provider.redirectToAuthorization(authorizationUrl);
return "REDIRECT";
}

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@ -23,3 +23,12 @@ export {
parseRunnerOAuthCallbackUrl,
} from "./runner-oauth-callback.js";
export type { RunnerOAuthCallbackConfig } from "./runner-oauth-callback.js";
export {
runRunnerInteractiveOAuth,
} from "./runner-interactive-oauth.js";
export type {
RunRunnerInteractiveOAuthOptions,
RunnerInteractiveOAuthClient,
RunnerInteractiveOAuthRedirectProvider,
RunnerInteractiveOAuthResult,
} from "./runner-interactive-oauth.js";

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@ -0,0 +1,136 @@
import type { AuthChallenge } from "../challenge.js";
import {
createOAuthCallbackServer,
type OAuthCallbackServer,
} from "./oauth-callback-server.js";
import type { RunnerOAuthCallbackConfig } from "./runner-oauth-callback.js";
/** Minimal InspectorClient surface for runner interactive OAuth. */
export interface RunnerInteractiveOAuthClient {
authenticate(): Promise<URL | undefined>;
beginInteractiveAuthorization(authorizationUrl: URL): Promise<void>;
completeOAuthFlow(authorizationCode: string): Promise<void>;
checkAuthChallengeSatisfied(challenge: AuthChallenge): Promise<boolean>;
}
export interface RunnerInteractiveOAuthRedirectProvider {
redirectUrl: string;
}
export type RunnerInteractiveOAuthResult =
| { kind: "success" }
| { kind: "already_authorized" }
| { kind: "insufficient_scope"; challenge: AuthChallenge };
/** Default wait for loopback OAuth callback (15 minutes). */
export const DEFAULT_RUNNER_INTERACTIVE_OAUTH_TIMEOUT_MS = 15 * 60 * 1000;
export interface RunRunnerInteractiveOAuthOptions {
client: RunnerInteractiveOAuthClient;
redirectUrlProvider: RunnerInteractiveOAuthRedirectProvider;
callbackListen: RunnerOAuthCallbackConfig;
/** When set, use deferred interactive authorization (mid-session step-up / re-login). */
authorizationUrl?: URL;
/** When set, verify scopes after a successful token exchange (SEP-2350 step-up). */
authChallenge?: AuthChallenge;
createCallbackServer?: () => OAuthCallbackServer;
/** Invoked after the listener binds; hosts may keep a ref for unmount cleanup. */
onCallbackServer?: (server: OAuthCallbackServer) => void;
/** Max wait for browser callback; defaults to {@link DEFAULT_RUNNER_INTERACTIVE_OAUTH_TIMEOUT_MS}. */
callbackTimeoutMs?: number;
}
/**
* Run interactive OAuth for Node runners (TUI / CLI): loopback callback server,
* browser redirect, authorization-code exchange via {@link completeOAuthFlow}.
*/
export async function runRunnerInteractiveOAuth(
options: RunRunnerInteractiveOAuthOptions,
): Promise<RunnerInteractiveOAuthResult> {
const createServer =
options.createCallbackServer ?? createOAuthCallbackServer;
const server = createServer();
let flowResolve!: () => void;
let flowReject!: (err: Error) => void;
const flowDone = new Promise<void>((resolve, reject) => {
flowResolve = resolve;
flowReject = reject;
});
try {
const { redirectUrl } = await server.start({
hostname: options.callbackListen.hostname,
port: options.callbackListen.port,
path: options.callbackListen.pathname,
onCallback: async (params) => {
try {
await options.client.completeOAuthFlow(params.code);
flowResolve();
} catch (err) {
flowReject(err instanceof Error ? err : new Error(String(err)));
}
},
onError: (params) => {
flowReject(
new Error(
params.error_description ?? params.error ?? "OAuth error",
),
);
},
});
options.onCallbackServer?.(server);
options.redirectUrlProvider.redirectUrl = redirectUrl;
const timeoutMs =
options.callbackTimeoutMs ?? DEFAULT_RUNNER_INTERACTIVE_OAUTH_TIMEOUT_MS;
let timeoutId: ReturnType<typeof setTimeout> | undefined;
const waitForCallback = Promise.race([
flowDone.finally(() => {
if (timeoutId !== undefined) {
clearTimeout(timeoutId);
}
}),
new Promise<void>((_, reject) => {
timeoutId = setTimeout(() => {
reject(
new Error(
`OAuth callback timed out after ${Math.round(timeoutMs / 1000)}s`,
),
);
}, timeoutMs);
}),
]);
if (options.authorizationUrl) {
await options.client.beginInteractiveAuthorization(
options.authorizationUrl,
);
await waitForCallback;
} else {
const authUrl = await options.client.authenticate();
if (authUrl !== undefined) {
await waitForCallback;
} else {
return { kind: "already_authorized" };
}
}
if (options.authChallenge) {
const satisfied = await options.client.checkAuthChallengeSatisfied(
options.authChallenge,
);
if (!satisfied) {
return {
kind: "insufficient_scope",
challenge: options.authChallenge,
};
}
}
return { kind: "success" };
} finally {
await server.stop().catch(() => {});
}
}

236
core/auth/oauthUx.ts Normal file
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@ -0,0 +1,236 @@
import type { AuthChallenge } from "./challenge.js";
export type OAuthInteractiveAuthKind = "step_up" | "reauth";
/** Origin of an interactive OAuth recovery flow (command, ambient, connect, etc.). */
export type OAuthRecoverySource =
| "tool"
| "prompt"
| "resource"
| "ambient"
| "app";
export function isActionTriggeredOAuthRecovery(
source: OAuthRecoverySource | undefined,
): boolean {
return (
source === "tool" ||
source === "prompt" ||
source === "resource" ||
source === "app"
);
}
export function oauthResumeSuccessMessage(
authKind: OAuthInteractiveAuthKind,
options?: { recoverySource?: OAuthRecoverySource },
): string {
const retry = isActionTriggeredOAuthRecovery(options?.recoverySource);
if (authKind === "step_up") {
return retry
? "Step-up authorization succeeded. Retry your action."
: "Step-up authorization succeeded.";
}
return retry
? "Authentication succeeded. Retry your action."
: "Authentication succeeded.";
}
export function authRecoveryRestoredMessage(options?: {
recoverySource?: OAuthRecoverySource;
}): string {
const retry = isActionTriggeredOAuthRecovery(options?.recoverySource);
return retry
? "Session credentials were updated. Retry your action."
: "Session credentials were updated.";
}
export function oauthResumeAbandonedMessage(
authKind: OAuthInteractiveAuthKind,
options?: { recoverySource?: OAuthRecoverySource },
): string {
if (authKind === "reauth") {
return "Sign-in was not completed. Re-authenticate to restore access.";
}
return isActionTriggeredOAuthRecovery(options?.recoverySource)
? "Step-up authorization was not completed. Retry your action."
: "Step-up authorization was not completed.";
}
/** Standard-OAuth step-up (not EMA silent re-mint). */
export function isStandardOAuthStepUp(
challenge: AuthChallenge,
options?: { enterpriseManaged?: boolean },
): boolean {
return (
challenge.reason === "insufficient_scope" && !options?.enterpriseManaged
);
}
/** EMA step-up (`insufficient_scope` on an enterprise-managed server). */
export function isEmaStepUp(
challenge: AuthChallenge,
options?: { enterpriseManaged?: boolean },
): boolean {
return (
challenge.reason === "insufficient_scope" &&
options?.enterpriseManaged === true
);
}
/** Any step-up that should show the Inspector confirmation modal before proceeding. */
export function isStepUpConfirmation(
challenge: AuthChallenge,
options?: { enterpriseManaged?: boolean },
): boolean {
return (
isStandardOAuthStepUp(challenge, options) ||
isEmaStepUp(challenge, options)
);
}
export function stepUpConfirmMessage(
challenge: AuthChallenge,
options?: { enterpriseManaged?: boolean },
): string {
const toolName = challenge.context?.toolName?.trim();
if (toolName) {
return options?.enterpriseManaged
? `Tool "${toolName}" needs additional permissions from your organization before it can continue.`
: `Tool "${toolName}" needs additional OAuth scopes before it can continue.`;
}
const additional = challenge.requiredScopes?.filter(Boolean);
if (additional?.length) {
const label = additional.length === 1 ? "scope" : "scopes";
return options?.enterpriseManaged
? `This operation needs additional organization ${label}: ${additional.join(", ")}.`
: `This operation needs additional ${label}: ${additional.join(", ")}.`;
}
return options?.enterpriseManaged
? "This operation needs additional permissions from your organization before it can continue."
: "This operation needs additional OAuth scopes before it can continue.";
}
/** Body copy below the step-up summary (what happens on Authorize). */
export function stepUpFollowUpMessage(options?: {
enterpriseManaged?: boolean;
}): string {
return options?.enterpriseManaged
? "Inspector will request the additional permissions from your enterprise identity provider. You may be asked to sign in if your organization session expired."
: "You will be redirected to authorize, then returned to the inspector.";
}
/** Step-up confirm action label (e.g. TUI menu item). EMA re-mints in-process when possible. */
export function stepUpAuthorizeActionLabel(options?: {
enterpriseManaged?: boolean;
}): string {
return options?.enterpriseManaged
? "Authorize"
: "Authorize (opens browser)";
}
export function stepUpModalTitle(options?: {
enterpriseManaged?: boolean;
}): string {
return options?.enterpriseManaged
? "Additional organization permissions required"
: "Additional permissions required";
}
/** Toast while EMA step-up is in progress after user confirms. */
export function emaStepUpInProgressMessage(): string {
return "Requesting additional permissions from your organization…";
}
/** Toast when EMA step-up completes successfully. */
export function emaStepUpSuccessMessage(options?: {
recoverySource?: OAuthRecoverySource;
}): string {
const retry = isActionTriggeredOAuthRecovery(options?.recoverySource);
return retry
? "Organization permissions were updated. Retry your action."
: "Organization permissions were updated.";
}
/** Toast when EMA step-up fails after user confirmation. */
export function emaStepUpFailureMessage(detail?: string): string {
return detail?.trim()
? detail
: "Could not obtain the additional permissions from your organization.";
}
/** Scopes the current operation still lacks (from the resource-server challenge). */
export function stepUpAdditionalScopes(challenge: AuthChallenge): string[] {
return challenge.requiredScopes?.filter(Boolean) ?? [];
}
export function stepUpInsufficientScopeMessage(
challenge: AuthChallenge,
): string {
const toolName = challenge.context?.toolName?.trim();
if (toolName) {
return `Authorization completed, but required permissions for tool "${toolName}" were not granted. Grant the requested scopes on the authorization server, then retry.`;
}
const missing =
challenge.authorizationScopes?.filter(Boolean) ??
challenge.requiredScopes?.filter(Boolean);
if (missing?.length) {
return `Authorization completed, but required scopes were not granted (${missing.join(", ")}). Grant the requested permissions on the authorization server, then retry your action.`;
}
return "Authorization completed, but the required permissions were not granted. Grant the requested scopes on the authorization server, then retry your action.";
}
export type OAuthPreRedirectContext = "connect" | "session_recovery";
/** Pre-redirect toast copy for interactive OAuth. */
export function oauthPreRedirectToastCopy(
authKind: OAuthInteractiveAuthKind,
options: {
serverName?: string;
enterpriseManaged?: boolean;
/** Fresh connect handshake — no existing session to recover. */
context?: OAuthPreRedirectContext;
},
): { title: string; message: string } | undefined {
if (options.context === "connect") {
return undefined;
}
const name = options.serverName;
if (authKind === "step_up") {
return {
title: name ? `Step-up authorization for "${name}"` : "Step-up authorization",
message: "Redirecting to authorize additional permissions…",
};
}
if (options.enterpriseManaged) {
return {
title: name ? `Re-authenticating "${name}"` : "Re-authenticating",
message: "Re-authenticating…",
};
}
return {
title: name ? `Session expired for "${name}"` : "Session expired",
message: "Session expired, re-authenticating…",
};
}
/** Challenge reasons that warrant a persistent re-auth banner (degraded session). */
export function isReAuthBannerReason(
reason: AuthChallenge["reason"] | undefined,
): boolean {
return (
reason === "token_expired" ||
reason === "unauthorized" ||
reason === "invalid_token"
);
}
export function reAuthBannerMessage(options: {
serverName?: string;
detail?: string;
}): string {
const prefix = options.serverName
? `Authentication for "${options.serverName}" needs attention.`
: "Authentication needs attention.";
return options.detail ? `${prefix} ${options.detail}` : prefix;
}

View file

@ -102,6 +102,7 @@ export type OAuthProviderConfig = {
export class BaseOAuthClientProvider implements OAuthClientProvider {
private capturedAuthUrl: URL | null = null;
private eventTarget: EventTarget | null = null;
private suppressAuthorizationNavigation = false;
protected serverUrl: string;
protected storage: OAuthStorage;
@ -138,6 +139,11 @@ export class BaseOAuthClientProvider implements OAuthClientProvider {
this.capturedAuthUrl = null;
}
/** Capture authorize URL without navigating (step-up confirmation modal). */
setSuppressAuthorizationNavigation(suppress: boolean): void {
this.suppressAuthorizationNavigation = suppress;
}
get scope(): string | undefined {
return this.storage.getScope(this.serverUrl);
}
@ -217,17 +223,16 @@ export class BaseOAuthClientProvider implements OAuthClientProvider {
// Capture URL for return value
this.capturedAuthUrl = authorizationUrl;
// Dispatch event if event target is set
if (this.eventTarget) {
this.eventTarget.dispatchEvent(
new CustomEvent("oauthAuthorizationRequired", {
detail: { url: authorizationUrl },
}),
);
if (!this.suppressAuthorizationNavigation) {
if (this.eventTarget) {
this.eventTarget.dispatchEvent(
new CustomEvent("oauthAuthorizationRequired", {
detail: { url: authorizationUrl },
}),
);
}
this.navigation.navigateToAuthorization(authorizationUrl);
}
// Original navigation behavior
this.navigation.navigateToAuthorization(authorizationUrl);
}
async saveCodeVerifier(codeVerifier: string): Promise<void> {

43
core/auth/scopes.ts Normal file
View file

@ -0,0 +1,43 @@
/**
* SEP-2350 scope helpers aligned with v2 `@modelcontextprotocol/client` exports.
* On SDK v2 upgrade, delete this module and import `computeScopeUnion` /
* `isStrictScopeSuperset` from the client package instead.
*/
import {
parseScopeString,
unionAuthorizationScopes,
} from "./challenge.js";
/** Union space-delimited scope strings (order-preserving, deduped). */
export function computeScopeUnion(
...scopes: ReadonlyArray<string | undefined>
): string | undefined {
let merged: string | undefined;
for (const scope of scopes) {
merged = unionAuthorizationScopes(merged, parseScopeString(scope)).join(
" ",
);
if (!merged) {
merged = undefined;
}
}
return merged;
}
/**
* Whether `union` contains a scope token not present in `current`.
* When the AS omits `scope` on the token response, `current` is empty and any
* non-empty union is a strict superset — step-up must re-authorize, not refresh.
*/
export function isStrictScopeSuperset(
union: string | undefined,
current: string | undefined,
): boolean {
if (!union) return false;
const currentSet = new Set((current ?? "").split(/\s+/).filter(Boolean));
for (const token of union.split(/\s+/)) {
if (token && !currentSet.has(token)) return true;
}
return false;
}

View file

@ -1,4 +1,69 @@
import type { CallbackParams } from "./types.js";
import { ZodError } from "zod";
type ZodIssueLike = {
path?: unknown[];
message?: string;
code?: string;
};
function isZodIssueArray(value: unknown): value is ZodIssueLike[] {
return (
Array.isArray(value) &&
value.length > 0 &&
typeof value[0] === "object" &&
value[0] !== null &&
"code" in value[0]
);
}
function formatZodIssues(issues: ZodIssueLike[]): string {
const tokenResponseIssue = issues.some(
(issue) =>
Array.isArray(issue.path) &&
(issue.path.includes("access_token") ||
issue.path.includes("token_type")),
);
if (tokenResponseIssue) {
return "The authorization server did not return valid tokens. Check your OAuth client ID and secret, then try again.";
}
return issues
.map((issue) => {
const path =
Array.isArray(issue.path) && issue.path.length
? issue.path.join(".")
: "input";
return `${path}: ${issue.message ?? "invalid"}`;
})
.join(" ");
}
/**
* Human-readable detail for OAuth failure toasts/banners (never raw Zod JSON).
*/
export function formatOAuthFailureDetail(detail: unknown): string {
if (detail instanceof ZodError) {
return formatZodIssues(detail.issues);
}
const raw =
detail instanceof Error
? detail.message
: typeof detail === "string"
? detail
: String(detail);
const trimmed = raw.trim();
if (trimmed.startsWith("[")) {
try {
const parsed: unknown = JSON.parse(trimmed);
if (isZodIssueArray(parsed)) {
return formatZodIssues(parsed);
}
} catch {
// fall through
}
}
return raw;
}
/**
* Parse a string as an absolute URL. On failure, throws with `label` and the

View file

@ -53,7 +53,7 @@ export function buildRunnerClientAuthOptions(
cliOverrides?: RunnerClientConfigOverrides,
): Pick<
InspectorClientOptions,
"oauth" | "enterpriseManagedAuth" | "installEnterpriseManagedAuth"
"oauth" | "enterpriseManagedAuth" | "installEnterpriseManagedAuth" | "directAuthRecovery"
> {
const activeIdp = getActiveEnterpriseManagedAuthIdp(clientConfig);
const activeCimdUrl = getActiveCimdClientMetadataUrl(clientConfig);
@ -112,5 +112,6 @@ export function buildRunnerClientAuthOptions(
...(clientConfig.enterpriseManagedAuth && {
installEnterpriseManagedAuth: clientConfig.enterpriseManagedAuth,
}),
...(oauth && { directAuthRecovery: true }),
};
}

View file

@ -118,11 +118,26 @@ import {
UrlElicitationLoopError,
} from "./urlElicitation.js";
import { ToolCallCancelledError } from "./toolCallCancelledError.js";
import type { OAuthConnectionState, OAuthFlowState, OAuthStep } from "../auth/types.js";
import type {
OAuthConnectionState,
OAuthFlowState,
OAuthStep,
} from "../auth/types.js";
import {
AuthRecoveryRequiredError,
EMA_STEP_UP_PENDING_URL,
isAuthChallengeError,
isConnectAuthRecoveryError,
parseAuthChallengeFromError,
type AuthChallenge,
type AuthChallengeOutcome,
type HandleAuthChallengeOptions,
} from "../auth/challenge.js";
import type { OAuthTokens } from "@modelcontextprotocol/sdk/shared/auth.js";
import { silentLogger, type InspectorLogger } from "../logging/logger.js";
import { createFetchTracker } from "./fetchTracking.js";
import { OAuthManager, type OAuthManagerConfig } from "./oauthManager.js";
import { RemoteClientTransport } from "./remote/remoteClientTransport.js";
/** Internal record for a receiver task (server polls us for status/result). */
interface ReceiverTaskRecord {
@ -181,6 +196,8 @@ export class InspectorClient extends InspectorClientEventTarget {
private baseTransport: Transport | null = null;
/** True when the cached transport was built with an OAuth authProvider attached. */
private transportHasAuthProvider = false;
/** Dedupes concurrent ambient auth challenges (reason + scopes). */
private ambientAuthChallengeInFlight = new Map<string, Promise<void>>();
private pipeStderr: boolean;
private initialLoggingLevel?: LoggingLevel;
private sample: boolean;
@ -249,6 +266,14 @@ export class InspectorClient extends InspectorClientEventTarget {
// Session ID (for OAuth state and saveSession event; persistence is in FetchRequestLogState)
private sessionId?: string;
private transportConfig: MCPServerConfig;
/** null until first transport is built; then true for in-process OAuth runners. */
private directAuthRecoveryActive: boolean | null = null;
/**
* Opt-in from {@link InspectorClientOptions.directAuthRecovery}: when true and
* the live transport is direct (not {@link RemoteClientTransport}), RPCs use
* fetch intercept + {@link withDirectAuthRecovery}.
*/
private readonly directAuthRecovery: boolean;
constructor(
transportConfig: MCPServerConfig,
@ -276,6 +301,7 @@ export class InspectorClient extends InspectorClientEventTarget {
? options.defaultMetadata
: undefined;
this.serverSettings = options.serverSettings;
this.directAuthRecovery = options.directAuthRecovery ?? false;
// Only set roots if explicitly provided (even if empty array) - this enables roots capability
this.roots = options.roots;
// Initialize listChangedNotifications config (default: all enabled)
@ -426,7 +452,10 @@ export class InspectorClient extends InspectorClientEventTarget {
};
this.dispatchTypedEvent("message", entry);
},
trackNotification: (message: JSONRPCNotification, origin: MessageOrigin) => {
trackNotification: (
message: JSONRPCNotification,
origin: MessageOrigin,
) => {
const entry: MessageEntry = {
id: crypto.randomUUID(),
timestamp: new Date(),
@ -761,12 +790,40 @@ export class InspectorClient extends InspectorClientEventTarget {
await oauthManager.createOAuthProviderForTransport();
}
}
if (
this.directAuthRecovery &&
this.directAuthRecoveryActive !== false &&
this.isHttpOAuthConfig() &&
oauthManager &&
transportOptions.authProvider
) {
transportOptions.interceptAuthChallenges = true;
}
this.transportHasAuthProvider = !!transportOptions.authProvider;
const { transport: baseTransport } = this.transportClientFactory(
this.transportConfig,
transportOptions,
);
this.baseTransport = baseTransport;
if (this.directAuthRecovery) {
this.directAuthRecoveryActive = !(
baseTransport instanceof RemoteClientTransport
);
}
if (
baseTransport instanceof RemoteClientTransport &&
oauthManager &&
this.isHttpOAuthConfig()
) {
baseTransport.setAuthRecovery({
handleAuthChallenge: (challenge, options) =>
oauthManager.handleAuthChallenge(challenge, options),
pushAuthState: () => this.pushRemoteAuthState(),
});
baseTransport.setOnAuthChallenge((challenge) => {
void this.handleAmbientAuthChallenge(challenge);
});
}
const messageTracking = this.createMessageTrackingCallbacks();
this.transport = new MessageTrackingTransport(
baseTransport,
@ -789,38 +846,38 @@ export class InspectorClient extends InspectorClientEventTarget {
// connect() starts clean and the upstream socket isn't left hanging.
const connectTimeoutMs = this.serverSettings?.connectionTimeout ?? 0;
const connectPromise = this.client.connect(this.transport);
if (connectTimeoutMs > 0) {
// Absorb any late rejection from `connectPromise` — when the timeout
// wins the race and `disconnect()` tears the transport down, real
// transports (SSE / streamable-http) reject the in-flight handshake
// *after* Promise.race has already settled. Without a handler here
// Node emits an unhandledRejection warning (and in test runs vitest
// can surface it as a suite failure). Only needed on the race path;
// the await-only branch below propagates rejection cleanly through
// the outer try/catch.
connectPromise.catch(() => {});
let timer: ReturnType<typeof setTimeout> | undefined;
const timeoutPromise = new Promise<never>((_, reject) => {
timer = setTimeout(
() =>
reject(
new Error(
`Connection timed out after ${connectTimeoutMs} ms`,
const runConnect = async (): Promise<void> => {
if (connectTimeoutMs > 0) {
connectPromise.catch(() => {});
let timer: ReturnType<typeof setTimeout> | undefined;
const timeoutPromise = new Promise<never>((_, reject) => {
timer = setTimeout(
() =>
reject(
new Error(
`Connection timed out after ${connectTimeoutMs} ms`,
),
),
),
connectTimeoutMs,
);
});
try {
await Promise.race([connectPromise, timeoutPromise]);
} catch (err) {
await this.disconnect().catch(() => {});
throw err;
} finally {
if (timer) clearTimeout(timer);
connectTimeoutMs,
);
});
try {
await Promise.race([connectPromise, timeoutPromise]);
} finally {
if (timer) clearTimeout(timer);
}
} else {
await connectPromise;
}
} else {
await connectPromise;
};
try {
await this.invokeMcpClient(runConnect);
} catch (err) {
if (connectTimeoutMs > 0) {
await this.disconnect().catch(() => {});
}
throw err;
}
this.status = "connected";
this.dispatchTypedEvent("statusChange", this.status);
@ -1116,8 +1173,10 @@ export class InspectorClient extends InspectorClientEventTarget {
// and routing work, and we inject the caller's progressToken into dispatched events.
}
} catch (error) {
this.status = "error";
this.dispatchTypedEvent("statusChange", this.status);
if (!isConnectAuthRecoveryError(error)) {
this.status = "error";
this.dispatchTypedEvent("statusChange", this.status);
}
if (this.baseTransport && !this.transportHasAuthProvider) {
await this.dropCachedTransport();
}
@ -1221,7 +1280,10 @@ export class InspectorClient extends InspectorClientEventTarget {
this.instructions = undefined;
this.protocolVersion = undefined;
this.dispatchTypedEvent("pendingSamplesChange", this.pendingSamples);
this.dispatchTypedEvent("pendingElicitationsChange", this.pendingElicitations);
this.dispatchTypedEvent(
"pendingElicitationsChange",
this.pendingElicitations,
);
this.dispatchTypedEvent("capabilitiesChange", this.capabilities);
this.dispatchTypedEvent("serverInfoChange", this.serverInfo);
this.dispatchTypedEvent("instructionsChange", this.instructions);
@ -1558,9 +1620,11 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
...(cursor ? { cursor } : {}),
};
const response = await this.client.listTools(
params,
this.getRequestOptions(metadata?.progressToken),
const response = await this.invokeMcpClient(() =>
this.client!.listTools(
params,
this.getRequestOptions(metadata?.progressToken),
),
);
const tools = [...(response.tools || [])];
return { tools, nextCursor: response.nextCursor };
@ -1803,13 +1867,17 @@ export class InspectorClient extends InspectorClientEventTarget {
// Both branches yield a CallToolResult: request() parsed it with
// CallToolResultSchema above, callTool() returns the same shape — so the
// `as CallToolResult` casts below are safe.
const result = options?.skipOutputValidation
? await client.request(
{ method: "tools/call", params: callParams },
CallToolResultSchema,
requestOptions,
)
: await client.callTool(callParams, undefined, requestOptions);
const result = await this.invokeMcpClient(
() =>
options?.skipOutputValidation
? client.request(
{ method: "tools/call", params: callParams },
CallToolResultSchema,
requestOptions,
)
: client.callTool(callParams, undefined, requestOptions),
{ method: "tools/call", toolName: tool.name },
);
// On the bypass path the result was delivered without the SDK's strict
// output validation. Run that check ourselves, non-fatally, so callers can
@ -2197,9 +2265,11 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
...(cursor ? { cursor } : {}),
};
const response = await this.client.listResources(
params,
this.getRequestOptions(metadata?.progressToken),
const response = await this.invokeMcpClient(() =>
this.client!.listResources(
params,
this.getRequestOptions(metadata?.progressToken),
),
);
return {
resources: response.resources || [],
@ -2225,9 +2295,13 @@ export class InspectorClient extends InspectorClientEventTarget {
uri,
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
};
const result = await this.client.readResource(
params,
this.getRequestOptions(metadata?.progressToken),
const result = await this.invokeMcpClient(
() =>
this.client!.readResource(
params,
this.getRequestOptions(metadata?.progressToken),
),
{ method: "resources/read" },
);
const invocation: ResourceReadInvocation = {
result,
@ -2317,9 +2391,13 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
...(cursor ? { cursor } : {}),
};
const response = await this.client.listResourceTemplates(
params,
this.getRequestOptions(metadata?.progressToken),
const response = await this.invokeMcpClient(
() =>
this.client!.listResourceTemplates(
params,
this.getRequestOptions(metadata?.progressToken),
),
{ method: "resources/templates/list" },
);
return {
resourceTemplates: response.resourceTemplates || [],
@ -2345,9 +2423,11 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
...(cursor ? { cursor } : {}),
};
const response = await this.client.listPrompts(
params,
this.getRequestOptions(metadata?.progressToken),
const response = await this.invokeMcpClient(() =>
this.client!.listPrompts(
params,
this.getRequestOptions(metadata?.progressToken),
),
);
return {
prompts: response.prompts || [],
@ -2380,9 +2460,13 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
};
const result = await this.client.getPrompt(
params,
this.getRequestOptions(metadata?.progressToken),
const result = await this.invokeMcpClient(
() =>
this.client!.getPrompt(
params,
this.getRequestOptions(metadata?.progressToken),
),
{ method: "prompts/get", toolName: name },
);
const invocation: PromptGetInvocation = {
@ -2437,9 +2521,17 @@ export class InspectorClient extends InspectorClientEventTarget {
...(effectiveMeta ? { _meta: effectiveMeta } : {}),
};
const response = await this.client.complete(
params,
this.getRequestOptions(metadata?.progressToken),
const response = await this.invokeMcpClient(
() =>
this.client!.complete(
params,
this.getRequestOptions(metadata?.progressToken),
),
{
method: "completion/complete",
toolName:
ref.type === "ref/prompt" ? ref.name : ref.uri,
},
);
return {
@ -2721,10 +2813,239 @@ export class InspectorClient extends InspectorClientEventTarget {
}
/**
* Completes OAuth flow with authorization code from the redirect callback.
* Satisfy a mid-session auth challenge (token refresh, step-up, or interactive re-auth).
*/
async completeOAuthFlow(authorizationCode: string): Promise<void> {
return this.ensureOAuthManager().completeOAuthFlow(authorizationCode);
async handleAuthChallenge(
challenge: AuthChallenge,
options?: HandleAuthChallengeOptions,
): Promise<AuthChallengeOutcome> {
return this.ensureOAuthManager().handleAuthChallenge(challenge, options);
}
/**
* Re-read OAuth storage and test whether a challenge is already satisfied.
* See {@link OAuthManager.checkAuthChallengeSatisfied}.
*/
async checkAuthChallengeSatisfied(
challenge: AuthChallenge,
): Promise<boolean> {
return this.ensureOAuthManager().checkAuthChallengeSatisfied(challenge);
}
/**
* Push recovered OAuth auth state to the remote backend (same MCP session).
*/
async pushRemoteAuthState(): Promise<void> {
if (!(this.baseTransport instanceof RemoteClientTransport)) {
return;
}
await this.baseTransport.pushAuthState();
}
/**
* Handle an ambient (SSE) auth challenge when no command-scoped send is active.
* Recovers session tokens on the remote backend; does not retry RPCs.
*/
async handleAmbientAuthChallenge(challenge: AuthChallenge): Promise<void> {
const key = this.ambientAuthChallengeKey(challenge);
const existing = this.ambientAuthChallengeInFlight.get(key);
if (existing) {
return existing;
}
const promise = this.runAmbientAuthChallenge(challenge);
this.ambientAuthChallengeInFlight.set(key, promise);
try {
await promise;
} finally {
if (this.ambientAuthChallengeInFlight.get(key) === promise) {
this.ambientAuthChallengeInFlight.delete(key);
}
}
}
private async runAmbientAuthChallenge(
challenge: AuthChallenge,
): Promise<void> {
try {
this.dispatchTypedEvent("authChallengeAmbient", { challenge });
const oauthManager = this.oauthManager;
if (!oauthManager) {
return;
}
const outcome = await oauthManager.handleAuthChallenge(challenge);
if (outcome.kind === "satisfied") {
if (this.baseTransport instanceof RemoteClientTransport) {
await this.pushRemoteAuthState();
} else {
await this.reconnectAfterAuthRecovery();
}
this.dispatchTypedEvent("authChallengeRecovered", { challenge });
} else if (outcome.kind === "step_up_confirm") {
this.dispatchTypedEvent("authChallengeInteractive", {
challenge: outcome.challenge,
authorizationUrl: EMA_STEP_UP_PENDING_URL,
});
} else if (outcome.kind === "interactive") {
this.dispatchTypedEvent("authChallengeInteractive", {
challenge: outcome.challenge,
authorizationUrl: outcome.authorizationUrl,
});
} else {
this.dispatchTypedEvent("oauthError", { error: outcome.error });
}
} catch (error) {
this.dispatchTypedEvent("oauthError", {
error: error instanceof Error ? error : new Error(String(error)),
});
}
}
private ambientAuthChallengeKey(challenge: AuthChallenge): string {
const requiredScopes = [...(challenge.requiredScopes ?? [])]
.sort()
.join(" ");
const authorizationScopes = [...(challenge.authorizationScopes ?? [])]
.sort()
.join(" ");
return `${challenge.reason}:${requiredScopes}:${authorizationScopes}`;
}
/**
* Full disconnect + reconnect after ambient auth recovery on direct transports.
*/
private async reconnectAfterAuthRecovery(): Promise<void> {
await this.disconnect().catch(() => {});
await this.dropCachedTransport();
await this.connect();
}
/** Direct (non-remote) OAuth transports recover via fetch intercept + handleAuthChallenge. */
private usesDirectAuthRecovery(): boolean {
return this.directAuthRecovery && this.directAuthRecoveryActive === true;
}
private async withDirectAuthRecovery<T>(
operation: () => Promise<T>,
context?: { method?: string; toolName?: string },
attempt = 0,
): Promise<T> {
try {
return await operation();
} catch (err) {
if (attempt >= 1 || !this.usesDirectAuthRecovery()) {
throw err;
}
if (!isAuthChallengeError(err)) {
throw err;
}
const challenge = parseAuthChallengeFromError(err, context);
if (!challenge) {
throw err;
}
if (context?.method || context?.toolName) {
this.dispatchTypedEvent("authChallengeCommand", { challenge });
} else {
this.dispatchTypedEvent("authChallengeAmbient", { challenge });
}
const outcome = await this.handleAuthChallenge(challenge);
if (outcome.kind === "satisfied") {
// Reconnect aborts activeToolCallAbortController; clear it so callTool
// retries are not immediately rejected with "Disconnected".
if (this.activeToolCallAbortController) {
this.activeToolCallAbortController = undefined;
}
await this.reconnectAfterAuthRecovery();
this.dispatchTypedEvent("authChallengeRecovered", { challenge });
return this.withDirectAuthRecovery(operation, context, attempt + 1);
}
if (outcome.kind === "step_up_confirm") {
throw new AuthRecoveryRequiredError(
EMA_STEP_UP_PENDING_URL,
outcome.challenge,
{ emaStepUpConfirm: true },
);
}
if (outcome.kind === "interactive") {
throw new AuthRecoveryRequiredError(
outcome.authorizationUrl,
outcome.challenge,
);
}
this.dispatchTypedEvent("oauthError", { error: outcome.error });
throw outcome.error;
}
}
private async invokeMcpClient<T>(
operation: () => Promise<T>,
context?: { method?: string; toolName?: string },
): Promise<T> {
if (!this.usesDirectAuthRecovery()) {
return operation();
}
return this.withDirectAuthRecovery(operation, context);
}
/**
* Completes OAuth flow with authorization code from the redirect callback.
* Direct transports reconnect after token exchange so the live MCP session
* picks up the new Bearer token (mirrors silent recovery reconnect).
*/
async completeOAuthFlow(authorizationCode: string, iss?: string): Promise<void> {
await this.ensureOAuthManager().completeOAuthFlow(authorizationCode, iss);
if (this.usesDirectAuthRecovery()) {
await this.reconnectAfterAuthRecovery();
}
}
/**
* Navigate to the authorization server for interactive recovery.
*/
async beginInteractiveAuthorization(authorizationUrl: URL): Promise<void> {
return this.ensureOAuthManager().beginInteractiveAuthorization(
authorizationUrl,
);
}
/** Remote Hono session id when using {@link RemoteClientTransport}. */
getRemoteBackendSessionId(): string | undefined {
if (this.baseTransport instanceof RemoteClientTransport) {
return this.baseTransport.getRemoteBackendSessionId();
}
return undefined;
}
/**
* Finish OAuth after a full-page redirect and reconnect (or reattach) the MCP session.
*/
async resumeAfterOAuth(
authorizationCode: string,
options?: { remoteSessionId?: string },
): Promise<void> {
await this.completeOAuthFlow(authorizationCode);
const remoteSessionId = options?.remoteSessionId;
const transport = this.baseTransport;
if (remoteSessionId && transport instanceof RemoteClientTransport) {
try {
await transport.attachToSession(remoteSessionId);
await transport.pushAuthState();
if (this.status !== "connected") {
await this.connect();
}
return;
} catch {
// Session expired during OAuth round trip — fall back to fresh connect.
}
}
if (this.status !== "connected") {
await this.connect();
}
}
/**

View file

@ -39,6 +39,7 @@ import type { SamplingCreateMessage } from "./samplingCreateMessage.js";
import type { ElicitationCreateMessage } from "./elicitationCreateMessage.js";
import type { JsonValue } from "../json/jsonUtils.js";
import type { OAuthTokens } from "@modelcontextprotocol/sdk/shared/auth.js";
import type { AuthChallenge } from "../auth/challenge.js";
/** Task with createdAt optional so we can emit synthetic tasks (e.g. on result/error) that omit it. */
export type TaskWithOptionalCreatedAt = Omit<Task, "createdAt"> & {
@ -148,6 +149,17 @@ export interface InspectorClientEventMap {
oauthComplete: { tokens: OAuthTokens };
oauthAuthorizationRequired: { url: URL };
oauthError: { error: Error };
/** Ambient (SSE) auth challenge while no command-scoped send is active. */
authChallengeAmbient: { challenge: AuthChallenge };
/** Command-scoped direct-transport auth challenge (no ambient toast). */
authChallengeCommand: { challenge: AuthChallenge };
/** Ambient auth recovery completed (remote auth state pushed). */
authChallengeRecovered: { challenge: AuthChallenge };
/** Interactive auth required; App orchestrates redirect (step-up modal or reauth). */
authChallengeInteractive: {
challenge: AuthChallenge;
authorizationUrl: URL;
};
}
/**

View file

@ -0,0 +1,34 @@
import {
AuthChallengeError,
parseAuthChallengeFromResponse,
} from "../../auth/challenge.js";
/**
* Wrap fetch so MCP HTTP 401/403 responses become {@link AuthChallengeError}
* before the SDK invokes `auth()` on a frozen remote token provider.
*/
export function createAuthChallengeInterceptFetch(
baseFetch: typeof fetch,
): typeof fetch {
return async (input, init) => {
const response = await baseFetch(input, init);
if (response.status !== 401 && response.status !== 403) {
return response;
}
const challenge = parseAuthChallengeFromResponse(response);
if (!challenge) {
return response;
}
// Release the connection before throwing so the SDK transport is not left
// with a half-read 401/403 body on streamable HTTP.
await response.body?.cancel().catch(() => {});
throw new AuthChallengeError(
challenge,
response.status,
`MCP auth challenge (${response.status})`,
);
};
}

View file

@ -12,6 +12,7 @@ import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js"
import { SSEClientTransport } from "@modelcontextprotocol/sdk/client/sse.js";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
import { createFetchTracker } from "../fetchTracking.js";
import { createAuthChallengeInterceptFetch } from "./authChallengeFetch.js";
/**
* Build the wire `headers` record from `settings.headers`, dropping rows with
@ -46,9 +47,13 @@ export function createTransportNode(
onFetchResponseBody,
authProvider,
settings,
interceptAuthChallenges = false,
} = options;
const baseFetch = optionsFetchFn ?? globalThis.fetch;
const fetchWithOptionalAuthIntercept = interceptAuthChallenges
? createAuthChallengeInterceptFetch(baseFetch)
: baseFetch;
if (serverType === "stdio") {
const stdioConfig = config as StdioServerConfig;
@ -79,7 +84,8 @@ export function createTransportNode(
const url = new URL(sseConfig.url);
const sseFetch =
(sseConfig.eventSourceInit?.fetch as typeof fetch) || baseFetch;
(sseConfig.eventSourceInit?.fetch as typeof fetch) ||
fetchWithOptionalAuthIntercept;
const trackedFetch = onFetchRequest
? createFetchTracker(sseFetch, {
trackRequest: onFetchRequest,
@ -101,11 +107,11 @@ export function createTransportNode(
};
const postFetch = onFetchRequest
? createFetchTracker(baseFetch, {
? createFetchTracker(fetchWithOptionalAuthIntercept, {
trackRequest: onFetchRequest,
updateResponseBody: onFetchResponseBody,
})
: baseFetch;
: fetchWithOptionalAuthIntercept;
const transport = new SSEClientTransport(url, {
authProvider,
@ -128,11 +134,11 @@ export function createTransportNode(
};
const transportFetch = onFetchRequest
? createFetchTracker(baseFetch, {
? createFetchTracker(fetchWithOptionalAuthIntercept, {
trackRequest: onFetchRequest,
updateResponseBody: onFetchResponseBody,
})
: baseFetch;
: fetchWithOptionalAuthIntercept;
const transport = new StreamableHTTPClientTransport(url, {
authProvider,

View file

@ -8,8 +8,8 @@ import { BaseOAuthClientProvider } from "../auth/providers.js";
import type { OAuthFlowState, OAuthStep } from "../auth/types.js";
import { EMPTY_OAUTH_FLOW_STATE } from "../auth/types.js";
import type { OAuthTokens } from "@modelcontextprotocol/sdk/shared/auth.js";
import { auth } from "@modelcontextprotocol/sdk/client/auth.js";
import type { OAuthClientInformation } from "@modelcontextprotocol/sdk/shared/auth.js";
import { mcpAuth } from "../auth/mcpAuth.js";
import { parseOAuthState } from "../auth/utils.js";
import type { EnterpriseManagedAuthIdpConfig } from "../client/types.js";
import type { ClientConfig } from "../client/types.js";
@ -24,12 +24,27 @@ import {
import {
buildOAuthConnectionState,
hasPersistedOAuthServerState,
isAccessTokenUsable,
isServerOAuthConfigured,
protocolFromOAuthConfig,
} from "../auth/connection-state.js";
import { ensureCimdClientRegistration } from "../auth/cimd.js";
import type { OAuthConnectionState } from "../auth/types.js";
import { EmaTransportOAuthProvider } from "../auth/ema/transportProvider.js";
import type {
AuthChallenge,
AuthChallengeOutcome,
HandleAuthChallengeOptions,
} from "../auth/challenge.js";
import {
parseScopeString,
unionAuthorizationScopes,
} from "../auth/challenge.js";
import {
computeScopeUnion,
isStrictScopeSuperset,
} from "../auth/scopes.js";
import { stepUpInsufficientScopeMessage } from "../auth/oauthUx.js";
import type {
InspectorClientEnvironment,
InspectorClientOptions,
@ -60,10 +75,14 @@ export class OAuthManager {
private params: OAuthManagerParams;
private oauthConfig: OAuthManagerConfig;
private oauthFlowState: OAuthFlowState | null = null;
/** SEP-2350 union scope pending until interactive step-up completes. */
private pendingAuthorizationScope: string | undefined;
private authChallengeMutex: Promise<void> = Promise.resolve();
constructor(params: OAuthManagerParams) {
this.params = params;
this.oauthConfig = { ...params.initialConfig };
this.pendingAuthorizationScope = undefined;
}
setOAuthConfig(config: {
@ -104,7 +123,8 @@ export class OAuthManager {
provider.setEventTarget(this.params.getEventTarget());
if (this.oauthConfig.scope) {
const storedScope = this.oauthConfig.storage.getScope(serverUrl);
if (storedScope === undefined && this.oauthConfig.scope) {
await provider.saveScope(this.oauthConfig.scope);
}
@ -146,7 +166,11 @@ export class OAuthManager {
idp,
resourceClientId: this.oauthConfig.clientId,
resourceClientSecret: this.oauthConfig.clientSecret,
scope: this.oauthConfig.scope,
scope:
computeScopeUnion(
this.oauthConfig.scope,
this.oauthConfig.storage.getScope(this.getServerUrl()),
) || this.oauthConfig.scope,
redirectUrl: this.oauthConfig.redirectUrlProvider.getRedirectUrl(),
storage: this.oauthConfig.storage,
fetchFn: this.params.effectiveAuthFetch,
@ -181,12 +205,8 @@ export class OAuthManager {
}
}
this.oauthConfig.navigation!.navigateToAuthorization(authorizationUrl);
this.oauthFlowState = {
...EMPTY_OAUTH_FLOW_STATE,
oauthStep: "authorization_code",
authorizationUrl,
};
this.requireNavigation().navigateToAuthorization(authorizationUrl);
await this.recordAuthorizationCodeFlowState(authorizationUrl);
return authorizationUrl;
}
@ -206,7 +226,7 @@ export class OAuthManager {
fetchFn: this.params.effectiveAuthFetch,
});
const result = await auth(provider, {
const result = await mcpAuth(provider, {
serverUrl,
scope: provider.scope,
fetchFn: this.params.effectiveAuthFetch,
@ -241,14 +261,28 @@ export class OAuthManager {
return capturedUrl;
}
async completeOAuthFlow(authorizationCode: string): Promise<void> {
async completeOAuthFlow(
authorizationCode: string,
iss?: string,
): Promise<void> {
try {
if (this.isEnterpriseManaged()) {
const config = this.getEmaFlowConfig();
const scopeForMint =
this.pendingAuthorizationScope ?? this.getEmaFlowConfig().scope;
const config = scopeForMint
? { ...this.getEmaFlowConfig(), scope: scopeForMint }
: this.getEmaFlowConfig();
const tokens = await completeEmaIdpAuthorizationAndMint(
config,
authorizationCode,
);
if (this.pendingAuthorizationScope) {
await this.oauthConfig.storage!.saveScope(
this.getServerUrl(),
this.pendingAuthorizationScope,
);
}
this.pendingAuthorizationScope = undefined;
const completedAt = Date.now();
this.oauthFlowState = {
...EMPTY_OAUTH_FLOW_STATE,
@ -263,9 +297,10 @@ export class OAuthManager {
const provider = await this.createOAuthProvider();
const serverUrl = this.getServerUrl();
const result = await auth(provider, {
const result = await mcpAuth(provider, {
serverUrl,
authorizationCode,
iss,
fetchFn: this.params.effectiveAuthFetch,
});
@ -280,6 +315,13 @@ export class OAuthManager {
throw new Error("Failed to retrieve tokens after authorization");
}
const scopeToPersist =
this.pendingAuthorizationScope ?? tokens.scope;
if (scopeToPersist) {
await provider.saveScope(scopeToPersist);
}
this.pendingAuthorizationScope = undefined;
const clientInfo = await provider.clientInformation();
const completedAt = Date.now();
this.oauthFlowState = this.oauthFlowState
@ -300,6 +342,7 @@ export class OAuthManager {
this.params.dispatchOAuthComplete({ tokens });
} catch (error) {
this.pendingAuthorizationScope = undefined;
this.params.dispatchOAuthError({
error: error instanceof Error ? error : new Error(String(error)),
});
@ -329,6 +372,7 @@ export class OAuthManager {
this.oauthConfig.storage.clear(serverUrl);
this.oauthFlowState = null;
this.pendingAuthorizationScope = undefined;
}
async isOAuthAuthorized(): Promise<boolean> {
@ -382,6 +426,387 @@ export class OAuthManager {
return tokens !== undefined;
}
/**
* Re-read persisted OAuth state and determine whether `challenge` is already
* satisfied without an authorization-server round-trip.
*
* Returns `true` for `insufficient_scope` when stored + token scope cover the
* SEP-2350 union. For `token_expired` / `unauthorized` / `invalid_token`,
* returns `true` when a usable access token is already in storage.
*/
async checkAuthChallengeSatisfied(
challenge: AuthChallenge,
): Promise<boolean> {
const storage = this.oauthConfig.storage;
if (!storage) {
return false;
}
const serverUrl = this.getServerUrl();
const tokens = await storage.getTokens(serverUrl);
if (!tokens?.access_token) {
return false;
}
if (challenge.reason !== "insufficient_scope") {
return (
challenge.reason === "token_expired" ||
challenge.reason === "unauthorized" ||
challenge.reason === "invalid_token"
) && isAccessTokenUsable(tokens);
}
const enriched = await this.enrichChallengeWithAuthorizationScopes(
challenge,
tokens.scope,
);
const scopeForAuth =
enriched.authorizationScopes?.join(" ") ??
enriched.requiredScopes?.join(" ");
if (!scopeForAuth?.trim()) {
return false;
}
const effectiveScope = computeScopeUnion(
storage.getScope(serverUrl),
tokens.scope,
);
return !isStrictScopeSuperset(scopeForAuth, effectiveScope);
}
/**
* Satisfy a mid-session auth challenge when possible (silent refresh/re-mint or
* interactive redirect).
*
* Only `insufficient_scope` short-circuits on {@link checkAuthChallengeSatisfied}
* here — `token_expired` / `unauthorized` still attempt silent refresh even when
* storage holds a locally-valid token (the resource server may have invalidated it).
* Callers use {@link checkAuthChallengeSatisfied} directly before visible OAuth.
*
* Recovery is serialized per server so parallel challenges cannot race on
* `pendingAuthorizationScope` or OAuth provider state.
*/
async handleAuthChallenge(
challenge: AuthChallenge,
options?: HandleAuthChallengeOptions,
): Promise<AuthChallengeOutcome> {
if (
challenge.reason === "insufficient_scope" &&
(await this.checkAuthChallengeSatisfied(challenge))
) {
return { kind: "satisfied" };
}
const prior = this.authChallengeMutex;
let release!: () => void;
const gate = new Promise<void>((resolve) => {
release = resolve;
});
this.authChallengeMutex = gate;
await prior;
try {
if (
challenge.reason === "insufficient_scope" &&
(await this.checkAuthChallengeSatisfied(challenge))
) {
return { kind: "satisfied" };
}
return await this.runHandleAuthChallenge(challenge, options);
} finally {
release();
}
}
private async runHandleAuthChallenge(
challenge: AuthChallenge,
options?: HandleAuthChallengeOptions,
): Promise<AuthChallengeOutcome> {
if (this.isEnterpriseManaged()) {
return this.handleEnterpriseManagedAuthChallenge(challenge, options);
}
return this.handleStandardAuthChallenge(challenge);
}
private async enrichChallengeWithAuthorizationScopes(
challenge: AuthChallenge,
grantedTokenScope?: string,
): Promise<AuthChallenge> {
if (challenge.reason !== "insufficient_scope") {
return challenge;
}
const storage = this.oauthConfig.storage;
const serverUrl = this.getServerUrl();
if (grantedTokenScope === undefined && storage) {
const tokens = await storage.getTokens(serverUrl);
grantedTokenScope = tokens?.scope;
}
const previousScope = computeScopeUnion(
storage?.getScope(serverUrl),
grantedTokenScope,
);
const requiredFromChallenge = challenge.requiredScopes?.filter(Boolean) ?? [];
const grantedSet = new Set(parseScopeString(previousScope));
const missingRequired = requiredFromChallenge.filter(
(scope) => !grantedSet.has(scope),
);
const requiredScopes =
missingRequired.length > 0 ? missingRequired : requiredFromChallenge;
const authorizationScopes = unionAuthorizationScopes(
previousScope,
requiredFromChallenge,
);
return {
...challenge,
requiredScopes,
authorizationScopes,
};
}
private resolveEmaScopeForChallenge(challenge: AuthChallenge): string | undefined {
if (challenge.reason === "insufficient_scope") {
const fromChallenge = challenge.requiredScopes?.join(" ").trim();
if (fromChallenge) {
return fromChallenge;
}
}
return this.oauthConfig.scope?.trim() || undefined;
}
private emaFlowConfigForChallenge(challenge: AuthChallenge): EmaFlowConfig {
const base = this.getEmaFlowConfig();
const enriched = challenge.authorizationScopes;
if (enriched && enriched.length > 0) {
return { ...base, scope: enriched.join(" ") };
}
const scope = this.resolveEmaScopeForChallenge(challenge);
return scope ? { ...base, scope } : base;
}
private async handleEnterpriseManagedAuthChallenge(
challenge: AuthChallenge,
options?: HandleAuthChallengeOptions,
): Promise<AuthChallengeOutcome> {
const enriched = await this.enrichChallengeWithAuthorizationScopes(challenge);
if (enriched.reason === "insufficient_scope" && !options?.confirmedStepUp) {
return { kind: "step_up_confirm", challenge: enriched };
}
const config = this.emaFlowConfigForChallenge(enriched);
if (enriched.reason === "insufficient_scope") {
const silent = await trySilentEmaAuth(config);
if (silent.status === "success") {
if (enriched.authorizationScopes?.length) {
await this.oauthConfig.storage!.saveScope(
this.getServerUrl(),
enriched.authorizationScopes.join(" "),
);
}
if (await this.checkAuthChallengeSatisfied(enriched)) {
return { kind: "satisfied" };
}
}
if (silent.status === "mint_failed") {
return { kind: "failed", error: silent.error };
}
} else {
const tokens = await refreshEmaResourceTokens(config);
if (tokens) {
return { kind: "satisfied" };
}
}
try {
const authorizationUrl = await startEmaIdpAuthorization(config);
if (
enriched.reason === "insufficient_scope" &&
enriched.authorizationScopes?.length
) {
this.pendingAuthorizationScope =
enriched.authorizationScopes.join(" ");
}
return { kind: "interactive", authorizationUrl, challenge: enriched };
} catch (error) {
return {
kind: "failed",
error: error instanceof Error ? error : new Error(String(error)),
};
}
}
private async handleStandardAuthChallenge(
challenge: AuthChallenge,
): Promise<AuthChallengeOutcome> {
const provider = await this.createOAuthProvider();
const serverUrl = this.getServerUrl();
const tokens = await provider.tokens();
const enriched = await this.enrichChallengeWithAuthorizationScopes(
challenge,
tokens?.scope,
);
provider.clearCapturedAuthUrl();
await ensureCimdClientRegistration({
serverUrl,
provider,
fetchFn: this.params.effectiveAuthFetch,
});
const scopeForAuth =
enriched.reason === "insufficient_scope"
? enriched.authorizationScopes?.join(" ")
: this.oauthConfig.scope?.trim() ||
(enriched.requiredScopes?.length
? enriched.requiredScopes.join(" ")
: undefined);
provider.setSuppressAuthorizationNavigation(true);
let result: Awaited<ReturnType<typeof mcpAuth>>;
try {
result = await mcpAuth(provider, {
serverUrl,
scope: scopeForAuth,
fetchFn: this.params.effectiveAuthFetch,
...(enriched.reason === "insufficient_scope" && {
forceReauthorization: isStrictScopeSuperset(
scopeForAuth,
tokens?.scope,
),
}),
});
} finally {
provider.setSuppressAuthorizationNavigation(false);
}
if (result === "AUTHORIZED") {
if (enriched.reason === "insufficient_scope") {
if (await this.checkAuthChallengeSatisfied(enriched)) {
if (scopeForAuth) {
await provider.saveScope(scopeForAuth);
}
return { kind: "satisfied" };
}
const forced = await this.tryForceReauthorizationForStepUp(
provider,
serverUrl,
scopeForAuth,
enriched,
);
if (forced) {
return forced;
}
return {
kind: "failed",
error: new Error(stepUpInsufficientScopeMessage(enriched)),
};
} else {
return { kind: "satisfied" };
}
}
const capturedUrl = provider.getCapturedAuthUrl();
if (!capturedUrl) {
return {
kind: "failed",
error: new Error("Failed to capture authorization URL"),
};
}
if (enriched.reason === "insufficient_scope" && scopeForAuth) {
this.pendingAuthorizationScope = scopeForAuth;
}
const clientInfo = await provider.clientInformation();
await this.recordAuthorizationCodeFlowState(capturedUrl, clientInfo);
return {
kind: "interactive",
authorizationUrl: capturedUrl,
challenge: enriched,
};
}
/** Start interactive OAuth after handleAuthChallenge returns `interactive`. */
async beginInteractiveAuthorization(authorizationUrl: URL): Promise<void> {
const stateParam = authorizationUrl.searchParams.get("state");
if (stateParam && this.params.onBeforeOAuthRedirect) {
const parsedState = parseOAuthState(stateParam);
if (parsedState?.authId) {
await this.params.onBeforeOAuthRedirect(parsedState.authId);
}
}
this.requireNavigation().navigateToAuthorization(authorizationUrl);
const provider = await this.createOAuthProvider();
const clientInfo = await provider.clientInformation();
await this.recordAuthorizationCodeFlowState(authorizationUrl, clientInfo);
this.params.dispatchOAuthAuthorizationRequired({ url: authorizationUrl });
}
private requireNavigation(): NonNullable<OAuthManagerConfig["navigation"]> {
const navigation = this.oauthConfig.navigation;
if (!navigation) {
throw new Error("OAuth navigation is required.");
}
return navigation;
}
private async recordAuthorizationCodeFlowState(
authorizationUrl: URL,
oauthClientInfo?: OAuthClientInformation | null,
): Promise<void> {
this.oauthFlowState = {
...EMPTY_OAUTH_FLOW_STATE,
oauthStep: "authorization_code",
authorizationUrl,
oauthClientInfo: oauthClientInfo ?? null,
};
}
/**
* Silent refresh returned AUTHORIZED but token scope still lacks the step-up
* union — force a fresh authorization redirect.
*/
private async tryForceReauthorizationForStepUp(
provider: BaseOAuthClientProvider,
serverUrl: string,
scopeForAuth: string | undefined,
enriched: AuthChallenge,
): Promise<AuthChallengeOutcome | null> {
provider.clearCapturedAuthUrl();
provider.setSuppressAuthorizationNavigation(true);
let result: Awaited<ReturnType<typeof mcpAuth>>;
try {
result = await mcpAuth(provider, {
serverUrl,
scope: scopeForAuth,
fetchFn: this.params.effectiveAuthFetch,
forceReauthorization: true,
});
} finally {
provider.setSuppressAuthorizationNavigation(false);
}
if (result !== "AUTHORIZED") {
return null;
}
if (await this.checkAuthChallengeSatisfied(enriched)) {
if (scopeForAuth) {
await provider.saveScope(scopeForAuth);
}
return { kind: "satisfied" };
}
return null;
}
/**
* Create an OAuth provider for transport auth (connect()).
* Used only when isHttpOAuthConfig() is true.

View file

@ -6,6 +6,7 @@
export {
RemoteClientTransport,
type RemoteTransportOptions,
type AuthRecoveryHandlers,
} from "./remoteClientTransport.js";
export {
createRemoteTransport,
@ -26,6 +27,7 @@ export {
export type {
RemoteConnectRequest,
RemoteConnectResponse,
RemoteSendResponse,
RemoteEvent,
} from "./types.js";
export { API_SERVER_ENV_VARS, LEGACY_AUTH_TOKEN_ENV } from "./constants.js";

View file

@ -6,12 +6,21 @@ import type { Transport } from "@modelcontextprotocol/sdk/shared/transport.js";
import type { JSONRPCMessage } from "@modelcontextprotocol/sdk/types.js";
import type { FetchRequestEntryBase } from "../../types.js";
import type { RemoteEvent } from "../types.js";
import type { AuthChallenge } from "../../../auth/challenge.js";
import { AuthChallengeError } from "../../../auth/challenge.js";
import type { RemoteAuthProviderHandle } from "./tokenAuthProvider.js";
import type { RemoteAuthState } from "../types.js";
export interface SessionEvent {
type: RemoteEvent["type"];
data: unknown;
}
type RequestWait = {
resolve: () => void;
reject: (error: Error) => void;
};
export class RemoteSession {
public readonly sessionId: string;
public transport!: Transport;
@ -19,11 +28,31 @@ export class RemoteSession {
private eventConsumer: ((event: SessionEvent) => void) | null = null;
private transportDead: boolean = false;
private transportError: string | null = null;
private activeSendCount = 0;
/**
* Suppress duplicate ambient SSE auth echoes after HTTP command-scoped delivery.
* Stale transport `onerror` may arrive after the send completes.
*/
private authHttpEchoSuppressUntilMs = 0;
static readonly AUTH_HTTP_ECHO_SUPPRESS_MS = 30_000;
private readonly requestWaits = new Map<string | number, RequestWait>();
private authProviderHandle: RemoteAuthProviderHandle | null = null;
constructor(sessionId: string) {
this.sessionId = sessionId;
}
setAuthProviderHandle(handle: RemoteAuthProviderHandle | null): void {
this.authProviderHandle = handle;
}
setAuthState(authState: RemoteAuthState): void {
if (!this.authProviderHandle) {
throw new Error("Session has no OAuth auth provider");
}
this.authProviderHandle.setAuthState(authState);
}
setTransport(transport: Transport): void {
this.transport = transport;
}
@ -72,6 +101,119 @@ export class RemoteSession {
return this.eventConsumer !== null;
}
beginSend(): void {
this.activeSendCount++;
}
endSend(): void {
if (this.activeSendCount > 0) {
this.activeSendCount--;
}
}
/** Command-scoped auth was returned on HTTP; suppress async onerror echo on SSE. */
noteAuthChallengeDeliveredViaHttp(): void {
this.extendAuthHttpEchoSuppression();
}
private extendAuthHttpEchoSuppression(): void {
this.authHttpEchoSuppressUntilMs =
Date.now() + RemoteSession.AUTH_HTTP_ECHO_SUPPRESS_MS;
}
private shouldSuppressAuthEcho(): boolean {
return Date.now() < this.authHttpEchoSuppressUntilMs;
}
hasActiveSend(): boolean {
return this.activeSendCount > 0;
}
pushAuthChallenge(challenge: AuthChallenge): void {
this.pushEvent({ type: "auth_challenge", data: challenge });
}
/**
* Streamable HTTP `transport.send()` can return before the JSON-RPC response
* arrives. The remote send handler awaits this so `/api/mcp/send` returns
* `auth_challenge` or `ok: true` only after the MCP round-trip (or auth error).
*/
waitForRequestResponse(
requestId: string | number,
timeoutMs = 60_000,
): Promise<void> {
return new Promise((resolve, reject) => {
const timer =
timeoutMs > 0
? setTimeout(() => {
this.requestWaits.delete(requestId);
reject(
new Error(
`MCP request ${String(requestId)} timed out after ${timeoutMs}ms`,
),
);
}, timeoutMs)
: undefined;
this.requestWaits.set(requestId, {
resolve: () => {
if (timer !== undefined) {
clearTimeout(timer);
}
resolve();
},
reject: (error) => {
if (timer !== undefined) {
clearTimeout(timer);
}
reject(error);
},
});
});
}
cancelRequestWait(requestId: string | number): void {
this.requestWaits.delete(requestId);
}
rejectActiveRequestWaits(error: Error): void {
for (const wait of this.requestWaits.values()) {
wait.reject(error);
}
this.requestWaits.clear();
}
/**
* Auth errors from the MCP transport.
* - During an active send: command path owns delivery (HTTP); never SSE.
* - After HTTP already returned auth_challenge: swallow async onerror echo.
* - Otherwise: ambient SSE (idle session).
*/
handleTransportAuthError(error: unknown): error is AuthChallengeError {
if (!(error instanceof AuthChallengeError)) {
return false;
}
this.rejectActiveRequestWaits(error);
if (this.hasActiveSend()) {
this.extendAuthHttpEchoSuppression();
return true;
}
if (this.shouldSuppressAuthEcho()) {
return true;
}
this.pushAuthChallenge(error.authChallenge);
return true;
}
private settleRequestWait(requestId: string | number): void {
const wait = this.requestWaits.get(requestId);
if (!wait) {
return;
}
this.requestWaits.delete(requestId);
wait.resolve();
}
pushEvent(event: SessionEvent): void {
if (this.eventConsumer) {
this.eventConsumer(event);
@ -81,6 +223,14 @@ export class RemoteSession {
}
onMessage(message: JSONRPCMessage): void {
if (
"id" in message &&
message.id !== null &&
message.id !== undefined &&
("result" in message || "error" in message)
) {
this.settleRequestWait(message.id);
}
this.pushEvent({ type: "message", data: message });
}

View file

@ -26,7 +26,13 @@ import type { Context, Env, Next } from "hono";
import { streamSSE } from "hono/streaming";
import { watch as chokidarWatch, type FSWatcher } from "chokidar";
import { createTransportNode } from "../../node/transport.js";
import type { RemoteConnectRequest, RemoteSendRequest } from "../types.js";
import type {
RemoteConnectRequest,
RemoteSendRequest,
RemoteSetAuthStateRequest,
} from "../types.js";
import type { JSONRPCMessage } from "@modelcontextprotocol/sdk/types.js";
import { AuthChallengeError } from "../../../auth/challenge.js";
import {
DEFAULT_MAX_FETCH_REQUESTS,
DEFAULT_TASK_TTL_MS,
@ -52,7 +58,7 @@ import {
} from "../../serverList.js";
import { resolveImportSource } from "../../import/resolveSource.js";
import { RemoteSession } from "./remote-session.js";
import { createTokenAuthProvider } from "./tokenAuthProvider.js";
import { createRemoteAuthProvider } from "./tokenAuthProvider.js";
import { API_SERVER_ENV_VARS } from "../constants.js";
import {
KeychainUnavailableError,
@ -321,6 +327,20 @@ function forwardLogEvent(
}
}
function requestIdForSendWait(
message: JSONRPCMessage,
): string | number | undefined {
if (
"method" in message &&
"id" in message &&
message.id !== null &&
message.id !== undefined
) {
return message.id;
}
return undefined;
}
export function createRemoteApp(
options: RemoteServerOptions,
): CreateRemoteAppResult {
@ -525,9 +545,12 @@ export function createRemoteApp(
const session = new RemoteSession(sessionId);
let transport: Awaited<ReturnType<typeof createTransportNode>>["transport"];
let authHandle: ReturnType<typeof createRemoteAuthProvider>;
try {
// Create authProvider from tokens if provided
const authProvider = createTokenAuthProvider(body.oauthTokens);
const initialAuthState =
body.authState ??
(body.oauthTokens ? { oauthTokens: body.oauthTokens } : undefined);
authHandle = createRemoteAuthProvider(initialAuthState);
const result = createTransportNode(config, {
pipeStderr: true,
@ -535,8 +558,12 @@ export function createRemoteApp(
onFetchRequest: (entry) => session.onFetchRequest(entry),
onFetchResponseBody: (id, body) =>
session.onFetchResponseBody(id, body),
authProvider,
authProvider: authHandle?.provider,
settings: body.settings,
// Always intercept 401/403 on the node MCP transport. Without this, the
// SDK's built-in auth() retry on a frozen token snapshot can hang or
// succeed locally while /api/mcp/send still awaits a JSON-RPC response.
interceptAuthChallenges: true,
});
transport = result.transport;
} catch (err) {
@ -544,6 +571,7 @@ export function createRemoteApp(
return c.json({ error: `Failed to create transport: ${msg}` }, 500);
}
session.setAuthProviderHandle(authHandle ?? null);
session.setTransport(transport);
transport.onmessage = (msg) => session.onMessage(msg);
@ -558,6 +586,10 @@ export function createRemoteApp(
// Set up error handlers BEFORE calling start() so we catch failures during start
transport.onerror = (err) => {
if (session.handleTransportAuthError(err)) {
originalOnerror?.(err);
return;
}
transportFailed = true;
transportError = err instanceof Error ? err.message : String(err);
originalOnerror?.(err);
@ -609,6 +641,19 @@ export function createRemoteApp(
}
} catch (err) {
// transport.start() threw - this is the expected failure path
if (err instanceof AuthChallengeError) {
try {
await transport.close();
} catch {
// Best-effort cleanup when connect fails with auth challenge.
}
session.noteAuthChallengeDeliveredViaHttp();
return c.json({
ok: false,
kind: "auth_challenge",
authChallenge: err.authChallenge,
});
}
const msg = err instanceof Error ? err.message : String(err);
// Preserve 401 only when the transport/SDK reports it (no message guessing)
const status =
@ -648,22 +693,41 @@ export function createRemoteApp(
// Check if transport is dead - return error immediately (matches local behavior)
if (session.isTransportDead()) {
const errorMsg = session.getTransportError() || "Transport closed";
return c.json({ error: errorMsg }, 500);
return c.json({ ok: false, kind: "transport_error", error: errorMsg });
}
session.beginSend();
const requestId = requestIdForSendWait(message);
let responseWait: Promise<void> | undefined;
if (requestId !== undefined) {
responseWait = session.waitForRequestResponse(requestId);
// Auth errors may reject the wait via onerror while send() also throws.
void responseWait.catch(() => {});
}
try {
await session.transport.send(message, {
relatedRequestId: relatedRequestId as string | number | undefined,
});
if (responseWait) {
await responseWait;
}
return c.json({ ok: true });
} catch (err) {
if (requestId !== undefined) {
session.cancelRequestWait(requestId);
}
if (err instanceof AuthChallengeError) {
session.noteAuthChallengeDeliveredViaHttp();
return c.json({
ok: false,
kind: "auth_challenge",
authChallenge: err.authChallenge,
});
}
const msg = err instanceof Error ? err.message : String(err);
// Preserve 401 only when the transport/SDK reports it (no message guessing)
const status =
(err as { code?: number; status?: number }).code ??
(err as { code?: number; status?: number }).status;
const is401 = status === 401;
return c.json({ error: msg }, is401 ? 401 : 500);
return c.json({ ok: false, kind: "transport_error", error: msg });
} finally {
session.endSend();
}
});
@ -746,6 +810,39 @@ export function createRemoteApp(
return c.json({ ok: true });
});
app.post("/api/mcp/auth-state", async (c) => {
let body: RemoteSetAuthStateRequest;
try {
body = (await c.req.json()) as RemoteSetAuthStateRequest;
} catch {
return c.json({ error: "Invalid JSON body" }, 400);
}
const { sessionId, authState } = body;
if (!sessionId || !authState) {
return c.json({ error: "Missing sessionId or authState" }, 400);
}
const session = sessions.get(sessionId);
if (!session) {
return c.json({ error: "Session not found" }, 404);
}
if (session.isTransportDead()) {
const errorMsg = session.getTransportError() || "Transport closed";
return c.json({ ok: false, kind: "transport_error", error: errorMsg });
}
try {
session.setAuthState(authState);
} catch (err) {
const msg = err instanceof Error ? err.message : String(err);
return c.json({ error: msg }, 400);
}
return c.json({ ok: true });
});
app.post("/api/fetch", async (c) => {
let body: {
url: string;

View file

@ -1,29 +1,48 @@
import type { OAuthClientProvider } from "@modelcontextprotocol/sdk/client/auth.js";
import type {
OAuthClientInformation,
OAuthClientMetadata,
OAuthTokens,
} from "@modelcontextprotocol/sdk/shared/auth.js";
import type { RemoteConnectRequest } from "../types.js";
import type { RemoteAuthState } from "../types.js";
const REMOTE_OAUTH_STUB_METADATA: OAuthClientMetadata = {
redirect_uris: [],
scope: "",
};
/**
* Simple OAuth client provider that just returns tokens.
* Used by the remote server to inject Bearer tokens into transport requests.
*
* The SDK may invoke {@link auth} on 401; stubs must satisfy the full provider
* surface so that path fails with a clear error instead of throwing on
* undefined `clientMetadata.scope`.
*/
export function createTokenAuthProvider(
tokens: RemoteConnectRequest["oauthTokens"],
): OAuthClientProvider | undefined {
if (!tokens) return undefined;
export interface RemoteAuthProviderHandle {
provider: OAuthClientProvider;
setAuthState: (authState: RemoteAuthState) => void;
getAuthState: () => RemoteAuthState;
}
function cloneAuthState(state: RemoteAuthState): RemoteAuthState {
return {
...(state.oauthTokens && {
oauthTokens: { ...state.oauthTokens },
}),
...(state.oauthClient && {
oauthClient: { ...state.oauthClient },
}),
};
}
/**
* Mutable OAuth provider for the remote backend MCP transport.
* Browser (or CLI) owns interactive OAuth; this injects Bearer tokens and can
* be hot-updated via {@link RemoteAuthProviderHandle.setAuthState}.
*/
export function createRemoteAuthProvider(
initialAuthState?: RemoteAuthState,
): RemoteAuthProviderHandle | undefined {
if (!initialAuthState?.oauthTokens && !initialAuthState?.oauthClient) {
return undefined;
}
let authState = cloneAuthState(initialAuthState);
const provider = {
get clientMetadata(): OAuthClientMetadata {
return REMOTE_OAUTH_STUB_METADATA;
},
@ -31,13 +50,31 @@ export function createTokenAuthProvider(
return "";
},
async tokens(): Promise<OAuthTokens | undefined> {
return tokens as OAuthTokens;
return authState.oauthTokens as OAuthTokens | undefined;
},
async clientInformation() {
return undefined;
async clientInformation(): Promise<OAuthClientInformation | undefined> {
if (!authState.oauthClient?.client_id) {
return undefined;
}
return {
client_id: authState.oauthClient.client_id,
...(authState.oauthClient.client_secret && {
client_secret: authState.oauthClient.client_secret,
}),
};
},
async saveTokens() {
// No-op
async saveTokens(tokens: OAuthTokens) {
authState = {
...authState,
oauthTokens: {
access_token: tokens.access_token,
token_type: tokens.token_type,
expires_in: tokens.expires_in,
refresh_token: tokens.refresh_token,
scope: tokens.scope,
id_token: tokens.id_token,
},
};
},
codeVerifier() {
return undefined;
@ -46,7 +83,7 @@ export function createTokenAuthProvider(
// No-op
},
clear() {
// No-op
authState = {};
},
async redirectToAuthorization() {
throw new Error(
@ -57,4 +94,14 @@ export function createTokenAuthProvider(
return "";
},
} as unknown as OAuthClientProvider;
return {
provider,
setAuthState(next: RemoteAuthState) {
authState = cloneAuthState(next);
},
getAuthState() {
return cloneAuthState(authState);
},
};
}

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