354 lines
13 KiB
C++
354 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include "config.h"
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#include <string>
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#include <vector>
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#include <Poco/DateTime.h>
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#include <Poco/DateTimeFormat.h>
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#include <Poco/DateTimeFormatter.h>
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#include <Poco/Exception.h>
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#include <Poco/FileStream.h>
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#include <Poco/Net/HTTPCookie.h>
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#include <Poco/Net/HTTPBasicCredentials.h>
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#include <Poco/Net/HTMLForm.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Net/NameValueCollection.h>
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#include <Poco/Net/NetException.h>
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#include <Poco/RegularExpression.h>
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#include <Poco/Runnable.h>
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#include <Poco/StreamCopier.h>
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#include <Poco/StringTokenizer.h>
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#include <Poco/URI.h>
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#include "Auth.hpp"
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#include "Common.hpp"
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#include "FileServer.hpp"
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#include "LOOLWSD.hpp"
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#include "Log.hpp"
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using Poco::FileInputStream;
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using Poco::Net::HTMLForm;
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using Poco::Net::HTTPRequest;
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using Poco::Net::HTTPResponse;
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using Poco::Net::NameValueCollection;
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using Poco::Net::HTTPBasicCredentials;
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using Poco::StreamCopier;
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using Poco::Util::Application;
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bool FileServerRequestHandler::tryAdminLogin(const HTTPRequest& request,
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HTTPResponse &response)
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{
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const auto& config = Application::instance().config();
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const auto sslKeyPath = config.getString("ssl.key_file_path", "");
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NameValueCollection cookies;
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request.getCookies(cookies);
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try
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{
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const std::string jwtToken = cookies.get("jwt");
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LOG_INF("Verifying JWT token: " << jwtToken);
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JWTAuth authAgent(sslKeyPath, "admin", "admin", "admin");
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if (authAgent.verify(jwtToken))
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{
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LOG_TRC("JWT token is valid");
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return true;
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}
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LOG_INF("Invalid JWT token, let the administrator re-login");
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}
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catch (const Poco::Exception& exc)
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{
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LOG_INF("No existing JWT cookie found");
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}
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// If no cookie found, or is invalid, let admin re-login
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const auto user = config.getString("admin_console.username", "");
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const auto pass = config.getString("admin_console.password", "");
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if (user.empty() || pass.empty())
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{
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LOG_ERR("Admin Console credentials missing. Denying access until set.");
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return false;
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}
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HTTPBasicCredentials credentials(request);
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if (credentials.getUsername() == user &&
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credentials.getPassword() == pass)
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{
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const std::string htmlMimeType = "text/html";
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// generate and set the cookie
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JWTAuth authAgent(sslKeyPath, "admin", "admin", "admin");
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const std::string jwtToken = authAgent.getAccessToken();
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Poco::Net::HTTPCookie cookie("jwt", jwtToken);
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// bundlify appears to add an extra /dist -> dist/dist/admin
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cookie.setPath("/loleaflet/dist/");
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cookie.setSecure(LOOLWSD::isSSLEnabled() ||
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LOOLWSD::isSSLTermination());
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response.addCookie(cookie);
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return true;
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}
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LOG_INF("Wrong admin credentials.");
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return false;
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}
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void FileServerRequestHandler::handleRequest(const HTTPRequest& request, Poco::MemoryInputStream& message,
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const std::shared_ptr<StreamSocket>& socket)
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{
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try
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{
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bool noCache = false;
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Poco::Net::HTTPResponse response;
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const auto requestPathname = Poco::Path(getRequestPathname(request));
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const auto filePath = Poco::Path(LOOLWSD::FileServerRoot, requestPathname);
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const auto file = Poco::File(filePath);
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LOG_TRC("Fileserver request: " << requestPathname.toString() << ", " <<
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"Resolved file path: " << filePath.toString());
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if (!file.exists() ||
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requestPathname[0] != "loleaflet" ||
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requestPathname[1] != "dist")
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{
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throw Poco::FileNotFoundException("Invalid URI request: [" + filePath.toString() + "].");
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}
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const auto& config = Application::instance().config();
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const std::string loleafletHtml = config.getString("loleaflet_html", "loleaflet.html");
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if (filePath.getFileName() == loleafletHtml)
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{
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preprocessAndSendLoleafletHtml(request, message, socket);
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return;
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}
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if (request.getMethod() == HTTPRequest::HTTP_GET)
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{
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if (filePath.getFileName() == "admin.html" ||
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filePath.getFileName() == "adminSettings.html" ||
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filePath.getFileName() == "adminAnalytics.html")
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{
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noCache = true;
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if (!FileServerRequestHandler::tryAdminLogin(request, response))
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throw Poco::Net::NotAuthenticatedException("Invalid admin login");
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// Ask UAs to block if they detect any XSS attempt
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response.add("X-XSS-Protection", "1; mode=block");
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}
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const std::string fileType = filePath.getExtension();
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std::string mimeType;
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if (fileType == "js")
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mimeType = "application/javascript";
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else if (fileType == "css")
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mimeType = "text/css";
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else if (fileType == "html")
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mimeType = "text/html";
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else if (fileType == "svg")
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mimeType = "image/svg+xml";
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else
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mimeType = "text/plain";
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auto it = request.find("If-None-Match");
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if (it != request.end())
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{
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// if ETags match avoid re-sending the file.
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if (!noCache && !it->second.compare("\"" LOOLWSD_VERSION_HASH "\""))
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{
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// TESTME: harder ... - do we even want ETag support ?
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std::ostringstream oss;
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Poco::Timestamp nowTs;
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Poco::DateTime now(nowTs);
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Poco::DateTime later(now.utcTime(), int64_t(1000)*1000 * 60 * 60 * 24 * 128);
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oss << "HTTP/1.1 304 Not Modified\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(
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now, Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "Expires: " << Poco::DateTimeFormatter::format(
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later, Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Cache-Control: max-age=11059200\r\n"
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<< "\r\n";
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socket->send(oss.str());
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socket->shutdown();
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return;
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}
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}
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bool deflate = request.hasToken("Accept-Encoding", "deflate");
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HttpHelper::sendFile(socket, filePath.toString(), mimeType, response, noCache, deflate);
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}
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}
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catch (const Poco::Net::NotAuthenticatedException& exc)
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{
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LOG_ERR("FileServerRequestHandler::NotAuthenticated: " << exc.displayText());
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// Unauthorized.
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std::ostringstream oss;
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oss << "HTTP/1.1 401\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Content-Length: 0\r\n"
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<< "WWW-Authenticate: Basic realm=\"online\"\r\n"
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<< "\r\n";
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socket->send(oss.str());
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}
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catch (const Poco::FileAccessDeniedException& exc)
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{
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LOG_ERR("FileServerRequestHandler: " << exc.displayText());
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// TODO return some 403 page?
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std::ostringstream oss;
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oss << "HTTP/1.1 403\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Content-Length: 0\r\n"
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<< "\r\n";
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socket->send(oss.str());
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}
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catch (const Poco::FileNotFoundException& exc)
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{
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LOG_ERR("FileServerRequestHandler: " << exc.displayText());
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// 404 not found
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std::ostringstream oss;
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oss << "HTTP/1.1 404\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Content-Length: 0\r\n"
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<< "\r\n";
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socket->send(oss.str());
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}
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}
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std::string FileServerRequestHandler::getRequestPathname(const HTTPRequest& request)
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{
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Poco::URI requestUri(request.getURI());
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// avoid .'s and ..'s
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requestUri.normalize();
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std::string path(requestUri.getPath());
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// Remove first foreslash as the root ends in one.
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if (path[0] == '/')
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path = path.substr(1);
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// Convert version back to a real file name.
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Poco::replaceInPlace(path, std::string("loleaflet/" LOOLWSD_VERSION_HASH "/"), std::string("loleaflet/dist/"));
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return path;
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}
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void FileServerRequestHandler::preprocessAndSendLoleafletHtml(const HTTPRequest& request, Poco::MemoryInputStream& message, const std::shared_ptr<StreamSocket>& socket)
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{
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const auto host = ((LOOLWSD::isSSLEnabled() || LOOLWSD::isSSLTermination()) ? "wss://" : "ws://") + (LOOLWSD::ServerName.empty() ? request.getHost() : LOOLWSD::ServerName);
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const auto params = Poco::URI(request.getURI()).getQueryParameters();
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std::string wopiDomain;
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for (const auto& param : params)
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{
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if (param.first == "WOPISrc")
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{
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std::string wopiHost;
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Poco::URI::decode(param.second, wopiHost);
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wopiDomain = Poco::URI(wopiHost).getScheme() + "://" + Poco::URI(wopiHost).getHost();
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}
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}
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const auto path = Poco::Path(LOOLWSD::FileServerRoot, getRequestPathname(request));
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LOG_DBG("Preprocessing file: " << path.toString());
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if (!Poco::File(path).exists())
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{
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LOG_ERR("File [" << path.toString() << "] does not exist.");
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// 404 not found
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std::ostringstream oss;
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oss << "HTTP/1.1 404\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Content-Length: 0\r\n"
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<< "\r\n";
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socket->send(oss.str());
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return;
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}
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std::string preprocess;
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FileInputStream file(path.toString());
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StreamCopier::copyToString(file, preprocess);
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file.close();
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HTMLForm form(request, message);
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const std::string& accessToken = form.get("access_token", "");
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const std::string& accessTokenTtl = form.get("access_token_ttl", "");
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LOG_TRC("access_token=" << accessToken << ", access_token_ttl=" << accessTokenTtl);
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// Escape bad characters in access token.
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// This is placed directly in javascript in loleaflet.html, we need to make sure
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// that no one can do anything nasty with their clever inputs.
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std::string escapedAccessToken;
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Poco::URI::encode(accessToken, "'", escapedAccessToken);
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unsigned long tokenTtl = 0;
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if (accessToken != "")
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{
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if (accessTokenTtl != "")
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{
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try
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{
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tokenTtl = std::stoul(accessTokenTtl);
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}
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catch(const std::exception& exc)
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{
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LOG_ERR("access_token_ttl must be represented as the number of milliseconds since January 1, 1970 UTC, when the token will expire");
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}
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}
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else
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{
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LOG_WRN("WOPI host did not pass optional access_token_ttl");
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}
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}
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Poco::replaceInPlace(preprocess, std::string("%ACCESS_TOKEN%"), escapedAccessToken);
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Poco::replaceInPlace(preprocess, std::string("%ACCESS_TOKEN_TTL%"), std::to_string(tokenTtl));
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Poco::replaceInPlace(preprocess, std::string("%HOST%"), host);
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Poco::replaceInPlace(preprocess, std::string("%VERSION%"), std::string(LOOLWSD_VERSION_HASH));
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const auto& config = Application::instance().config();
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const auto loleafletLogging = config.getString("loleaflet_logging", "false");
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Poco::replaceInPlace(preprocess, std::string("%LOLEAFLET_LOGGING%"), loleafletLogging);
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const std::string mimeType = "text/html";
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std::ostringstream oss;
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oss << "HTTP/1.1 200 OK\r\n"
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<< "Date: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "Last-Modified: " << Poco::DateTimeFormatter::format(Poco::Timestamp(), Poco::DateTimeFormat::HTTP_FORMAT) << "\r\n"
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<< "User-Agent: LOOLWSD WOPI Agent\r\n"
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<< "Cache-Control:max-age=11059200\r\n"
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<< "ETag: \"" LOOLWSD_VERSION_HASH "\"\r\n"
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<< "Content-Length: " << preprocess.size() << "\r\n"
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<< "Content-Type: " << mimeType << "\r\n"
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<< "X-Content-Type-Options: nosniff\r\n"
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<< "X-XSS-Protection: 1; mode=block\r\n";
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if (!wopiDomain.empty())
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{
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oss << "X-Frame-Options: allow-from " << wopiDomain << "\r\n"
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<< "Content-Security-Policy: frame-ancestors " << wopiDomain << "\r\n";
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}
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oss << "\r\n"
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<< preprocess;
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socket->send(oss.str());
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LOG_DBG("Sent file: " << path.toString() << ": " << preprocess);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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