loolconfig: tool to generate admin password hash with PBKDF2

A normal usage to set the admin password would be like :

loolconfig set-admin-password --config-file ./loolwsd.xml

Other command line options can also be given, like --pwd-salt-length,
--pwd-hash-length, --pwd-iterations.

Change-Id: I2a6f8d25e068b53a3f945426f0779c8410b2c8ba

1 files changed, 228 insertions, 0 deletions

diff --git a/tools/Config.cpp b/tools/Config.cpp
new file mode 100644
index 000000000..60be997c7
--- /dev/null
+++ b/tools/Config.cpp
@@ -0,0 +1,228 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "config.h"
+
+#include <iostream>
+#include <iomanip>
+#include <termios.h>
+
+#include <openssl/rand.h>
+#include <openssl/evp.h>
+
+#include <Poco/Exception.h>
+#include <Poco/Util/Application.h>
+#include <Poco/Util/Option.h>
+#include <Poco/Util/OptionSet.h>
+#include <Poco/Util/XMLConfiguration.h>
+
+#include "Util.hpp"
+
+using Poco::Util::Application;
+using Poco::Util::Option;
+using Poco::Util::OptionSet;
+using Poco::Util::XMLConfiguration;
+
+#define MIN_PWD_SALT_LENGTH 20
+#define MIN_PWD_ITERATIONS 1000
+#define MIN_PWD_HASH_LENGTH 20
+
+class LoolConfig final: public XMLConfiguration
+{
+public:
+    LoolConfig() :
+        XMLConfiguration()
+        {}
+};
+
+struct AdminConfig
+{
+    unsigned pwdSaltLength = 128;
+    unsigned pwdIterations = 10000;
+    unsigned pwdHashLength = 128;
+};
+
+// Config tool to change loolwsd configuration (loolwsd.xml)
+class Config: public Application
+{
+    // Display help information on the console
+    void displayHelp();
+
+    LoolConfig _loolConfig;
+
+    AdminConfig _adminConfig;
+
+public:
+    static std::string ConfigFile;
+
+protected:
+    void defineOptions(OptionSet&) override;
+    void handleOption(const std::string&, const std::string&) override;
+    int main(const std::vector<std::string>&) override;
+};
+
+std::string Config::ConfigFile = LOOLWSD_CONFIGDIR "/loolwsd.xml";
+
+void Config::displayHelp()
+{
+    std::cout << "loolconfig - Configuration tool for LibreOffice Online." << std::endl
+              << "Commands:" << std::endl
+              << "  set-admin-password" << std::endl;
+}
+
+void Config::defineOptions(OptionSet& optionSet)
+{
+    Application::defineOptions(optionSet);
+
+    optionSet.addOption(Option("help", "", "Config helper tool to set loolwsd configuration")
+                        .required(false)
+                        .repeatable(false));
+    optionSet.addOption(Option("pwd-salt-length", "", "Length of the salt to use to hash password")
+                        .required(false)
+                        .repeatable(false).
+                        argument("number"));
+    optionSet.addOption(Option("pwd-iterations", "", "Number of iterations to do in PKDBF2 password hashing")
+                        .required(false)
+                        .repeatable(false)
+                        .argument("number"));
+    optionSet.addOption(Option("pwd-hash-length", "", "Length of password hash to generate")
+                        .required(false)
+                        .repeatable(false)
+                        .argument("number"));
+    optionSet.addOption(Option("config-file", "", "Specify configuration file path manually.")
+                        .required(false)
+                        .repeatable(false)
+                        .argument("path"));
+}
+
+void Config::handleOption(const std::string& optionName, const std::string& optionValue)
+{
+    Application::handleOption(optionName, optionValue);
+    if (optionName == "help")
+    {
+        displayHelp();
+        std::exit(Application::EXIT_OK);
+    }
+    else if (optionName == "config-file")
+    {
+        ConfigFile = optionValue;
+    }
+    else if (optionName == "pwd-salt-length")
+    {
+        unsigned len = std::stoi(optionValue);
+        if (len < MIN_PWD_SALT_LENGTH)
+        {
+            len = MIN_PWD_SALT_LENGTH;
+            std::cout << "Password salt length adjusted to minimum " << len << std::endl;
+        }
+        _adminConfig.pwdSaltLength = len;
+    }
+    else if (optionName == "pwd-iterations")
+    {
+        unsigned len = std::stoi(optionValue);
+        if (len < MIN_PWD_ITERATIONS)
+        {
+            len = MIN_PWD_ITERATIONS;
+            std::cout << "Password iteration adjusted to minimum " << len << std::endl;
+        }
+        _adminConfig.pwdIterations = len;
+    }
+    else if (optionName == "pwd-hash-length")
+    {
+        unsigned len = std::stoi(optionValue);
+        if (len < MIN_PWD_HASH_LENGTH)
+        {
+            len = MIN_PWD_HASH_LENGTH;
+            std::cout << "Password hash length adjusted to minimum " << len << std::endl;
+        }
+        _adminConfig.pwdHashLength = len;
+    }
+}
+
+int Config::main(const std::vector<std::string>& args)
+{
+    if (args.empty())
+    {
+        std::cerr << "Nothing to do." << std::endl;
+        displayHelp();
+        return Application::EXIT_NOINPUT;
+    }
+
+    _loolConfig.load(ConfigFile);
+
+    for (unsigned i = 0; i < args.size(); i++) {
+        if (args[i] == "set-admin-password")
+        {
+            unsigned char pwdhash[_adminConfig.pwdHashLength];
+            unsigned char salt[_adminConfig.pwdSaltLength];
+            RAND_bytes(salt, _adminConfig.pwdSaltLength);
+            std::stringstream stream;
+
+            // Ask for user password
+            termios oldTermios;
+            tcgetattr(STDIN_FILENO, &oldTermios);
+            termios newTermios = oldTermios;
+            // Disable user input mirroring on console for password input
+            newTermios.c_lflag &= ~ECHO;
+            tcsetattr(STDIN_FILENO, TCSANOW, &newTermios);
+            std::string adminPwd;
+            std::cout << "Enter admin password: ";
+            std::cin >> adminPwd;
+            std::string reAdminPwd;
+            std::cout << std::endl << "Confirm admin password: ";
+            std::cin >> reAdminPwd;
+            std::cout << std::endl;
+            // Set the termios to old state
+            tcsetattr(STDIN_FILENO, TCSANOW, &oldTermios);
+            if (adminPwd != reAdminPwd)
+            {
+                std::cout << "Password mismatch." << std::endl;
+                return Application::EXIT_DATAERR;
+            }
+
+            // Do the magic !
+            PKCS5_PBKDF2_HMAC(adminPwd.c_str(), -1,
+                              salt, _adminConfig.pwdSaltLength,
+                              _adminConfig.pwdIterations,
+                              EVP_sha512(),
+                              _adminConfig.pwdHashLength, pwdhash);
+
+            // Make salt randomness readable
+            for (unsigned j = 0; j < _adminConfig.pwdSaltLength; ++j)
+                stream << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(salt[j]);
+            const std::string saltHash = stream.str();
+
+            // Clear our used hex stream to make space for password hash
+            stream.str("");
+            stream.clear();
+
+            // Make the hashed password readable
+            for (unsigned j = 0; j < _adminConfig.pwdHashLength; ++j)
+                stream << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(pwdhash[j]);
+            const std::string passwordHash = stream.str();
+
+            const std::string pwdConfigValue = "pbkdf2.sha512." +
+                                                std::to_string(_adminConfig.pwdIterations) + "." +
+                                                saltHash + "." + passwordHash;
+            _loolConfig.setString("admin_console.secure_password[@desc]",
+                                  "Salt and password hash combination generated using PBKDF2 with SHA512 digest.");
+            _loolConfig.setString("admin_console.secure_password", pwdConfigValue);
+
+            std::cout << "Saving configuration to : " << ConfigFile << " ..." << std::endl;
+            _loolConfig.save(ConfigFile);
+        }
+    }
+
+    // This tool only handles options, nothing to do here
+    return Application::EXIT_OK;
+}
+
+POCO_APP_MAIN(Config);
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */