fix(mcp): escape OAuth callback errors (#32242)
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@@ -26,6 +26,15 @@ const HTML_SUCCESS = `<!DOCTYPE html>
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</body>
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</html>`
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function escapeHtml(value: string) {
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return value
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.replaceAll("&", "&")
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.replaceAll("<", "<")
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.replaceAll(">", ">")
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.replaceAll('"', """)
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.replaceAll("'", "'")
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}
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const HTML_ERROR = (error: string) => `<!DOCTYPE html>
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<html>
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<head>
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@@ -42,7 +51,7 @@ const HTML_ERROR = (error: string) => `<!DOCTYPE html>
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<div class="container">
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<h1>Authorization Failed</h1>
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<p>An error occurred during authorization.</p>
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<div class="error">${error}</div>
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<div class="error">${escapeHtml(error)}</div>
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</div>
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</body>
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</html>`
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@@ -87,7 +96,7 @@ function handleRequest(req: import("http").IncomingMessage, res: import("http").
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// Enforce state parameter presence
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if (!state) {
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const errorMsg = "Missing required state parameter - potential CSRF attack"
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res.writeHead(400, { "Content-Type": "text/html" })
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res.writeHead(400, { "Content-Type": "text/html; charset=utf-8" })
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res.end(HTML_ERROR(errorMsg))
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return
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}
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@@ -101,13 +110,13 @@ function handleRequest(req: import("http").IncomingMessage, res: import("http").
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cleanupStateIndex(state)
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pending.reject(new Error(errorMsg))
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}
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res.writeHead(200, { "Content-Type": "text/html" })
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res.writeHead(200, { "Content-Type": "text/html; charset=utf-8" })
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res.end(HTML_ERROR(errorMsg))
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return
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}
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if (!code) {
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res.writeHead(400, { "Content-Type": "text/html" })
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res.writeHead(400, { "Content-Type": "text/html; charset=utf-8" })
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res.end(HTML_ERROR("No authorization code provided"))
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return
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}
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@@ -115,7 +124,7 @@ function handleRequest(req: import("http").IncomingMessage, res: import("http").
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// Validate state parameter
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if (!pendingAuths.has(state)) {
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const errorMsg = "Invalid or expired state parameter - potential CSRF attack"
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res.writeHead(400, { "Content-Type": "text/html" })
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res.writeHead(400, { "Content-Type": "text/html; charset=utf-8" })
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res.end(HTML_ERROR(errorMsg))
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return
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}
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@@ -127,7 +136,7 @@ function handleRequest(req: import("http").IncomingMessage, res: import("http").
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cleanupStateIndex(state)
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pending.resolve(code)
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res.writeHead(200, { "Content-Type": "text/html" })
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res.writeHead(200, { "Content-Type": "text/html; charset=utf-8" })
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res.end(HTML_SUCCESS)
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}
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