防止poco服务器应用程序中的目录遍历攻击

我有一个poco服务器应用程序项目。此服务器应用程序用作Web服务器。现在我想加强它的抵抗目录遍历攻击,我正在寻找最好的方法来确保服务器提供的文件是从内部的 wwwRoot . 结构是

project
|-src
| |-main.cpp
|-CMakeLists.txt
|-conanfile.txt
|-build
  |-...

例如,当我使用 build 作为 www. , conanfile.txt 在外面 www. 但与 localhost:8080/../conanfile.txt 我可以打开它。我知道我可以搜索点段的路径,但我听说它不是真正安全的,因为有黑客像编码路径。由于poco是服务器应用程序的框架,我假设已经有这样一个函数来检查 filePath 在里面 www. 但我找不到。

这个 src/main.cpp 包含:

#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/ServerSocket.h>
#include <Poco/Util/ServerApplication.h>
#include <Poco/Net/HTTPRequestHandler.h>
#include <Poco/Net/HTTPRequestHandlerFactory.h>
#include <Poco/Net/HTTPServerRequest.h>
#include <Poco/Net/HTTPServerResponse.h>
#include <Poco/Path.h>
#include <string>

class FileHandler: public Poco::Net::HTTPRequestHandler {
public:
    explicit FileHandler(const Poco::Path &wwwRoot);
protected:
    void handleRequest(Poco::Net::HTTPServerRequest &request,
                       Poco::Net::HTTPServerResponse &response) override;
private:
    Poco::Path wwwRoot;
};

FileHandler::FileHandler(const Poco::Path &aWwwRoot) : wwwRoot(aWwwRoot) {}

void FileHandler::handleRequest(Poco::Net::HTTPServerRequest &request,
                   Poco::Net::HTTPServerResponse &response) {
    Poco::Util::Application &app = Poco::Util::Application::instance();
    app.logger().information("FileHandler Request from " + request.clientAddress().toString() + ": " + request.getURI());


    Poco::Path path(wwwRoot.absolute(), request.getURI());
    std::string filePath(path.toString());
    app.logger().information(filePath);
    response.sendFile(filePath, "text/html");
}

class HTTPRequestHandlerFactory: public Poco::Net::HTTPRequestHandlerFactory {
public:
    explicit HTTPRequestHandlerFactory(const Poco::Path &wwwRoot);
protected:
    Poco::Net::HTTPRequestHandler* createRequestHandler(
            const Poco::Net::HTTPServerRequest& request) override;
private:
    Poco::Path wwwRoot;
};

HTTPRequestHandlerFactory::HTTPRequestHandlerFactory(const Poco::Path &aWwwRoot) : wwwRoot(aWwwRoot) {}

Poco::Net::HTTPRequestHandler* HTTPRequestHandlerFactory::createRequestHandler(
        const Poco::Net::HTTPServerRequest &) {
    return new FileHandler(wwwRoot);
}

class ServerApplication : public Poco::Util::ServerApplication {
protected:
    void initialize(Application& self) override;
    int main(const std::vector<std::string> &args) override;
};

void ServerApplication::initialize(Application& self) {
    loadConfiguration();
    Poco::Util::ServerApplication::initialize(self);
}

int ServerApplication::main(const std::vector<std::string> &) {

    Poco::Net::ServerSocket svs(8080);
    Poco::Net::HTTPServer srv(new HTTPRequestHandlerFactory(Poco::Path(".").absolute()),
                              svs, new Poco::Net::HTTPServerParams);
    srv.start();
    waitForTerminationRequest();
    srv.stop();
    return Application::EXIT_OK;
}

int main(int argc, char **argv) {
  ServerApplication app;
  return app.run(argc, argv);
}

这个 CMakeLists.txt 包含:

cmake_minimum_required (VERSION 3.5.1)
project (Sandbox)

if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Debug)
endif()

set(CMAKE_CXX_FLAGS "-Wall -Wextra")
set(CMAKE_CXX_FLAGS_DEBUG "-g")
set(CMAKE_CXX_FLAGS_RELEASE "-O3")
set(CMAKE_CXX_STANDARD 14)

include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup(TARGETS)

add_executable(${PROJECT_NAME} src/main.cpp)
target_link_libraries(${PROJECT_NAME} PRIVATE CONAN_PKG::Poco)

这个 conanfile.txt文件 包含:

[requires]
Poco/1.9.0@pocoproject/stable

[generators]
cmake

在 建造 项目建成了