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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 | import { randomBytes } from 'node:crypto'; import { createServer, type Server } from 'node:http'; import type { OAuthClientProvider, OAuthDiscoveryState, } from '@modelcontextprotocol/sdk/client/auth.js'; import type { OAuthClientInformationMixed, OAuthClientMetadata, OAuthTokens, } from '@modelcontextprotocol/sdk/shared/auth.js'; import type { RemoteAuthorization } from './connection-store'; import { SavedOAuthTokens } from './connection-store'; import { OAuthTokensSchema } from '@modelcontextprotocol/sdk/shared/auth.js'; import { fetchWithinOrigin, type FetchLike } from '@modelcontextprotocol/sdk/shared/transport.js'; import { RefreshGuard } from './refresh-guard'; interface SharedAuthorization { current(): RemoteAuthorization | undefined; lockPath: string; } /** SDK OAuth state belongs to one proposed or committed connection, never to a host name. */ export class ConnectionAuthorization implements OAuthClientProvider { private verifier?: string; private readonly nonce = randomBytes(32).toString('base64url'); private callback?: Server; private timer?: NodeJS.Timeout; authorizationUrl?: string; onCode?: (code: string) => Promise<void>; onFailure?: () => void; interactive = false; private readonly abort = new AbortController(); private readonly refreshLock: RefreshGuard; constructor( public data: RemoteAuthorization, private readonly save: (patch: Partial<RemoteAuthorization>) => RemoteAuthorization | void, private readonly shared: SharedAuthorization, ) { this.refreshLock = new RefreshGuard(shared.lockPath); } readonly fetch: FetchLike = async (url, init) => { const body = init?.body; const signal = init?.signal ? AbortSignal.any([init.signal, this.abort.signal]) : this.abort.signal; const request = { ...init, signal }; if ( body instanceof URLSearchParams && body.get('grant_type') === 'refresh_token' && this.shared.current() ) { const previous = this.data.tokens; return this.refreshLock.run(() => this.refresh(url, request, body, previous)); } return fetch(url, request); }; private async refresh( url: string | URL, init: RequestInit, body: URLSearchParams, previous: OAuthTokens | undefined, ): Promise<Response> { const current = this.shared.current(); if (!current) throw new Error('The OAuth connection is no longer selected.'); this.data = current; const tokens = current.tokens; if (!tokens) throw new Error('Reconnect from connection settings.'); if ( tokens.refresh_token !== body.get('refresh_token') || tokens.access_token !== previous?.access_token ) return Response.json(tokens); const issuer = tokens.issuer; const response = await fetchWithinOrigin(fetch)(url, init); const value: unknown = await response.json(); this.abort.signal.throwIfAborted(); if (!response.ok) return this.refreshError(response.status, value); // RFC 6749 section 6 retains the old refresh token when the response omits a replacement. const refreshed = { refresh_token: tokens.refresh_token, ...OAuthTokensSchema.omit({ issuer: true }).parse(value), issuer, }; this.persist({ tokens: refreshed }); return Response.json(refreshed); } private refreshError(status: number, value: unknown): Response { const code = typeof value === 'object' && value !== null && 'error' in value ? value.error : undefined; if (code === 'invalid_grant') this.persist({ tokens: undefined }); else if (code === 'invalid_client' || code === 'unauthorized_client') this.persist({ client: undefined, tokens: undefined, discovery: undefined }); const recognized = [ 'invalid_grant', 'invalid_client', 'unauthorized_client', 'invalid_request', 'invalid_scope', 'unsupported_grant_type', 'server_error', 'temporarily_unavailable', ]; if (typeof code !== 'string' || !recognized.includes(code)) throw new Error(`OAuth refresh failed (HTTP ${status}).`); return Response.json({ error: code }, { status }); } get redirectUrl(): string { return this.data.redirectUrl; } get clientMetadata(): OAuthClientMetadata { return { client_name: 'GitLab by Structured World', redirect_uris: [this.redirectUrl], grant_types: ['authorization_code', 'refresh_token'], response_types: ['code'], token_endpoint_auth_method: 'none', }; } state(): string { return this.nonce; } clientInformation(): OAuthClientInformationMixed | undefined { return this.data.client; } saveClientInformation(client: OAuthClientInformationMixed): void { this.persist({ client }); } tokens(): OAuthTokens | undefined { return this.data.tokens; } saveTokens(tokens: OAuthTokens): void { // Committed refresh results are saved under the shared lock before the SDK receives them. const current = this.shared.current(); if (current) { this.data = current; return; } this.persist({ tokens: SavedOAuthTokens.parse(tokens) }); } saveDiscoveryState(discovery: OAuthDiscoveryState): void { this.persist({ discovery }); } discoveryState(): OAuthDiscoveryState | undefined { return this.data.discovery; } saveCodeVerifier(verifier: string): void { this.verifier = verifier; } codeVerifier(): string { if (!this.verifier) throw new Error('Sign-in expired. Reconnect from connection settings.'); return this.verifier; } redirectToAuthorization(url: URL): void { if (!this.interactive) throw new Error('Reconnect from connection settings.'); this.authorizationUrl = url.href; } invalidateCredentials(scope: 'all' | 'client' | 'tokens' | 'verifier' | 'discovery'): void { const current = this.shared.current(); if (current && (scope === 'all' || scope === 'tokens')) { this.data = current; if (scope === 'all') this.verifier = undefined; return; } const patch: Partial<RemoteAuthorization> = {}; if (scope === 'all' || scope === 'client') patch.client = undefined; if (scope === 'all' || scope === 'tokens') patch.tokens = undefined; if (scope === 'all' || scope === 'discovery') patch.discovery = undefined; if (scope === 'all' || scope === 'verifier') this.verifier = undefined; this.persist(patch); } private persist(patch: Partial<RemoteAuthorization>): void { this.data = { ...this.data, ...patch }; const committed = this.save(patch); if (committed) this.data = committed; } async listen(): Promise<void> { const path = `/callback/${randomBytes(24).toString('base64url')}`; const callback = createServer((request, response) => { if (!request.url) { response.writeHead(400).end('Invalid authorization callback.'); return; } const url = new URL(request.url, this.redirectUrl); if ( request.method !== 'GET' || url.pathname !== path || url.searchParams.get('state') !== this.nonce ) { response.writeHead(400).end('Invalid authorization callback.'); return; } const issuer = this.data.discovery?.authorizationServerUrl; if (url.searchParams.has('iss') && url.searchParams.get('iss') !== String(issuer)) { response.writeHead(400).end('Invalid authorization issuer.'); return; } const code = url.searchParams.get('code'); response .writeHead(200, { 'Content-Type': 'text/plain; charset=utf-8', 'Cache-Control': 'no-store', 'Content-Security-Policy': "default-src 'none'", }) .end('Return to GitLab connection settings.'); this.stopListener(); if (!code || url.searchParams.has('error')) { this.close(); this.onFailure?.(); return; } void this.onCode?.(code).catch(() => this.onFailure?.()); }); this.callback = callback; await new Promise<void>((resolve, reject) => { callback.once('error', reject); callback.listen(0, '127.0.0.1', resolve); }); const address = callback.address(); if (!address || typeof address === 'string') throw new Error('Cannot start sign-in callback.'); this.data.redirectUrl = `http://127.0.0.1:${address.port}${path}`; this.interactive = true; this.timer = setTimeout(() => { this.close(); this.onFailure?.(); }, 5 * 60_000); this.timer.unref(); } close(): void { this.stopListener(); this.verifier = undefined; this.interactive = false; } async dispose(): Promise<void> { this.close(); this.abort.abort(); await this.refreshLock.close(); } private stopListener(): void { if (this.timer) clearTimeout(this.timer); this.callback?.close(); this.callback?.closeAllConnections(); this.callback = undefined; } } |