--- /dev/null
+/*
+ suPHP - (c)2002-2005 Sebastian Marsching <sebastian@marsching.com>
+
+ This file is part of suPHP.
+
+ suPHP is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ suPHP is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with suPHP; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <iostream>
+
+#include "config.h"
+
+#include "CommandLine.hpp"
+#include "Environment.hpp"
+#include "Exception.hpp"
+#include "File.hpp"
+#include "Configuration.hpp"
+#include "API.hpp"
+#include "API_Helper.hpp"
+#include "Logger.hpp"
+#include "UserInfo.hpp"
+#include "GroupInfo.hpp"
+#include "Util.hpp"
+
+#include "Application.hpp"
+
+using namespace suPHP;
+
+
+suPHP::Application::Application() {
+ /* do nothing */
+}
+
+
+int suPHP::Application::run(CommandLine& cmdline, Environment& env) {
+ Configuration config;
+ API& api = API_Helper::getSystemAPI();
+ Logger& logger = api.getSystemLogger();
+
+#ifdef OPT_CONFIGFILE
+ File cfgFile = File(OPT_CONFIGFILE);
+#else
+ File cfgFile = File("/etc/suphp.conf");
+#endif
+
+ std::string interpreter;
+ TargetMode targetMode;
+ Environment newEnv;
+
+ // Begin try block - soft exception cannot really be handled before
+ // initialization
+ try {
+ std::string scriptFilename;
+
+ // If caller is super-user, print info message and exit
+ if (api.getRealProcessUser().isSuperUser()) {
+ this->printAboutMessage();
+ return 0;
+ }
+ config.readFromFile(cfgFile);
+
+ // Check permissions (real uid, effective uid)
+ this->checkProcessPermissions(config);
+
+ // Initialize logger
+ // not done before, because we need super-user privileges for
+ // logging anyway
+ logger.init(config);
+
+ try {
+ scriptFilename = env.getVar("SCRIPT_FILENAME");
+ } catch (KeyNotFoundException& e) {
+ logger.logError("Environment variable SCRIPT_FILENAME not set");
+ this->printAboutMessage();
+ return 1;
+ }
+
+ this->checkScriptFile(scriptFilename, config, env);
+
+ this->changeProcessPermissions(scriptFilename, config, env);
+
+ interpreter = this->getInterpreter(env, config);
+ targetMode = this->getTargetMode(interpreter);
+
+ // Prepare environment for new process
+ newEnv = this->prepareEnvironment(env, config, targetMode);
+
+ // Log attempt to execute script
+ logger.logInfo("Executing \"" + scriptFilename + "\" as UID "
+ + Util::intToStr(api.getEffectiveProcessUser().getUid())
+ + ", GID "
+ + Util::intToStr(
+ api.getEffectiveProcessGroup().getGid()));
+
+ this->executeScript(scriptFilename, interpreter, targetMode, newEnv,
+ config);
+
+ // Function should never return
+ // So, if we get here, return with error code
+ return 1;
+ } catch (SoftException& e) {
+ if (!config.getErrorsToBrowser()) {
+ std::cerr << e;
+ return 2;
+ }
+ std::cout << "Content-Type: text/html\n"
+ << "Status: 500\n"
+ << "\n"
+ << "<html>\n"
+ << " <head>\n"
+ << " <title>500 Internal Server Error</title>\n"
+ << " </head>\n"
+ << " <body>\n"
+ << " <h1>Internal Server Error</h1>\n"
+ << " <p>" << e.getMessage() << "</p>\n"
+ << " <hr/>"
+ << " <address>suPHP " << PACKAGE_VERSION << "</address>\n"
+ << " </body>\n"
+ << "</html>\n";
+ }
+}
+
+
+void suPHP::Application::printAboutMessage() {
+ std::cerr << "suPHP version " << PACKAGE_VERSION << "\n";
+ std::cerr << "(c) 2002-2005 Sebastian Marsching\n";
+ std::cerr << std::endl;
+ std::cerr << "suPHP has to be called by mod_suphp to work." << std::endl;
+}
+
+
+void suPHP::Application::checkProcessPermissions(Configuration& config)
+ throw (SecurityException, LookupException) {
+ API& api = API_Helper::getSystemAPI();
+ if (api.getRealProcessUser() !=
+ api.getUserInfo(config.getWebserverUser())) {
+ throw SecurityException("Calling user is not webserver user!",
+ __FILE__, __LINE__);
+ }
+
+ if (!api.getEffectiveProcessUser().isSuperUser()) {
+ throw SecurityException(
+ "Do not have root privileges. Executable not set-uid root?",
+ __FILE__, __LINE__);
+ }
+}
+
+
+void suPHP::Application::checkScriptFile(
+ const std::string& scriptFilename,
+ const Configuration& config,
+ const Environment& environment) const
+ throw (SystemException, SoftException) {
+ Logger& logger = API_Helper::getSystemAPI().getSystemLogger();
+ File scriptFile = File(scriptFilename);
+
+ // Check wheter file exists
+ if (!scriptFile.exists()) {
+ std::string error = "File " + scriptFile.getPath() + " does not exist";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ // Get full path to script file
+
+ File realScriptFile = File(scriptFile.getRealPath());
+ File directory = realScriptFile.getParentDirectory();
+
+ // Check wheter script is in docroot
+ if (realScriptFile.getPath().find(config.getDocroot()) != 0) {
+ std::string error = "Script \"" + scriptFile.getPath()
+ + "\" resolving to \"" + realScriptFile.getPath()
+ + "\" not within configured docroot";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ // If enabled, check whether script is in the vhost's docroot
+ if (!environment.hasVar("DOCUMENT_ROOT"))
+ throw SoftException("Environment variable DOCUMENT_ROOT not set",
+ __FILE__, __LINE__);
+ if (config.getCheckVHostDocroot()
+ && realScriptFile.getPath().find(environment.getVar("DOCUMENT_ROOT"))
+ != 0) {
+
+ std::string error = "File \"" + realScriptFile.getPath()
+ + "\" is not in document root of Vhost \""
+ + environment.getVar("DOCUMENT_ROOT") + "\"";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ // Check script and directory permissions
+ if (!realScriptFile.hasUserReadBit()) {
+ std::string error = "File \"" + realScriptFile.getPath()
+ + "\" not readable";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+
+ }
+
+ if (!config.getAllowFileGroupWriteable()
+ && realScriptFile.hasGroupWriteBit()) {
+ std::string error = "File \"" + realScriptFile.getPath()
+ + "\" is writeable by group";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ if (!config.getAllowDirectoryGroupWriteable()
+ && directory.hasGroupWriteBit()) {
+ std::string error = "Directory \"" + directory.getPath()
+ + "\" is writeable by group";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ if (!config.getAllowFileOthersWriteable()
+ && realScriptFile.hasOthersWriteBit()) {
+ std::string error = "File \"" + realScriptFile.getPath()
+ + "\" is writeable by others";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ if (!config.getAllowDirectoryOthersWriteable()
+ && directory.hasOthersWriteBit()) {
+ std::string error = "Directory \"" + directory.getPath()
+ + "\" is writeable by others";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ // Check UID/GID of symlink is matching target
+ if (scriptFile.getUser() != realScriptFile.getUser()
+ || scriptFile.getGroup() != realScriptFile.getGroup()) {
+ std::string error = "UID or GID of symlink \"" + scriptFile.getPath()
+ + "\" is not matching its target";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+}
+
+
+void suPHP::Application::changeProcessPermissions(
+ const std::string& scriptFilename,
+ const Configuration& config,
+ const Environment& environment) const
+ throw (SystemException, SoftException, SecurityException) {
+ UserInfo targetUser;
+ GroupInfo targetGroup;
+
+ File scriptFile = File(File(scriptFilename).getRealPath());
+ API& api = API_Helper::getSystemAPI();
+ Logger& logger = api.getSystemLogger();
+
+ // Make sure that exactly one mode is set
+
+#if !defined(OPT_USERGROUP_OWNER) && !defined(OPT_USERGROUP_FORCE) && !defined(OPT_USERGROUP_PARANOID)
+#error "No uid/gid change model specified"
+#endif
+#if (defined(OPT_USERGROUP_OWNER) && defined(OPT_USERGROUP_FORCE)) || (defined(OPT_USERGROUP_FORCE) && defined(OPT_USERGROUP_PARANOID)) || (defined(OPT_USERGROUP_OWNER) && defined(OPT_USERGROUP_PARANOID))
+#error "More than one uid/gid change model specified"
+#endif
+
+ // Common code (for all security modes)
+
+ // Check UID/GID of script
+ if (scriptFile.getUser().getUid() < config.getMinUid()) {
+ std::string error = "UID of script \"" + scriptFilename
+ + "\" is smaller than min_uid";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+ if (scriptFile.getGroup().getGid() < config.getMinGid()) {
+ std::string error = "GID of script \"" + scriptFilename
+ + "\" is smaller than min_gid";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ // Paranoid and force mode
+
+#if (defined(OPT_USERGROUP_PARANOID) || defined(OPT_USERGROUP_FORCE))
+ std::string targetUsername, targetGroupname;
+ try {
+ targetUsername = environment.getVar("SUPHP_USER");
+ targetGroupname = environment.getVar("SUPHP_GROUP");
+ } catch (KeyNotFoundException& e) {
+ throw SecurityException(
+ "Environment variable SUPHP_USER or SUPHP_GROUP not set",
+ __FILE__, __LINE__);
+ }
+
+ if (targetUsername[0] == '#' && targetUsername.find_first_not_of(
+ "0123456789", 1) == std::string::npos) {
+ targetUser = api.getUserInfo(Util::strToInt(targetUsername.substr(1)));
+ } else {
+ targetUser = api.getUserInfo(targetUsername);
+ }
+
+ if (targetGroupname[0] == '#' && targetGroupname.find_first_not_of(
+ "0123456789", 1) == std::string::npos) {
+ targetGroup = api.getGroupInfo(
+ Util::strToInt(targetGroupname.substr(1)));
+ } else {
+ targetGroup = api.getGroupInfo(targetGroupname);
+ }
+#endif // OPT_USERGROUP_PARANOID || OPT_USERGROUP_FORCE
+
+ // Owner mode only
+
+#ifdef OPT_USERGROUP_OWNER
+ targetUser = scriptFile.getUser();
+ targetGroup = scriptFile.getGroup();
+#endif // OPT_USERGROUP_OWNER
+
+ // Paranoid mode only
+
+#ifdef OPT_USERGROUP_PARANOID
+ if (targetUser != scriptFile.getUser()) {
+ std::string error ="Mismatch between target UID ("
+ + Util::intToStr(targetUser.getUid()) + ") and UID ("
+ + Util::intToStr(scriptFile.getUser().getUid()) + ") of file \""
+ + scriptFile.getPath() + "\"";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+
+ if (targetGroup != scriptFile.getGroup()) {
+ std::string error ="Mismatch between target GID ("
+ + Util::intToStr(targetGroup.getGid()) + ") and GID ("
+ + Util::intToStr(scriptFile.getGroup().getGid()) + ") of file \""
+ + scriptFile.getPath() + "\"";
+ logger.logWarning(error);
+ throw SoftException(error, __FILE__, __LINE__);
+ }
+#endif // OPT_USERGROUP_PARANOID
+
+ // Common code used for all modes
+
+ // Set new group first, because we still need super-user privileges
+ // for this
+ api.setProcessGroup(targetGroup);
+
+ // Then set new user
+ api.setProcessUser(targetUser);
+
+ api.setUmask(config.getUmask());
+}
+
+
+Environment suPHP::Application::prepareEnvironment(
+ const Environment& sourceEnv, const Configuration& config, TargetMode mode)
+ throw (KeyNotFoundException) {
+ // Create environment for new process from old environment
+ Environment env = sourceEnv;
+
+ // Delete unwanted environment variables
+ if (env.hasVar("LD_PRELOAD"))
+ env.deleteVar("LD_PRELOAD");
+ if (env.hasVar("LD_LIBRARY_PATH"))
+ env.deleteVar("LD_LIBRARY_PATH");
+ if (env.hasVar("SUPHP_USER"))
+ env.deleteVar("SUPHP_USER");
+ if (env.hasVar("SUPHP_GROUP"))
+ env.deleteVar("SUPHP_GROUP");
+ if (env.hasVar("SUPHP_HANDLER"))
+ env.deleteVar("SUPHP_HANDLER");
+ if (env.hasVar("SUPHP_AUTH_USER"))
+ env.deleteVar("SUPHP_AUTH_USER");
+ if (env.hasVar("SUPHP_AUTH_PW"))
+ env.deleteVar("SUPHP_AUTH_PW");
+ if (env.hasVar("SUPHP_PHP_CONFIG"))
+ env.deleteVar("SUPHP_PHP_CONFIG");
+
+ // Reset PATH
+ env.putVar("PATH", config.getEnvPath());
+
+ // If we are in PHP mode, set PHP specific variables
+ if (mode == TARGETMODE_PHP) {
+ if (sourceEnv.hasVar("SUPHP_PHP_CONFIG"))
+ env.putVar("PHPRC", sourceEnv.getVar("SUPHP_PHP_CONFIG"));
+ if (sourceEnv.hasVar("SUPHP_AUTH_USER")
+ && sourceEnv.hasVar("SUPHP_AUTH_PW")) {
+ env.putVar("PHP_AUTH_USER", sourceEnv.getVar("SUPHP_AUTH_USER"));
+ env.putVar("PHP_AUTH_PW", sourceEnv.getVar("SUPHP_AUTH_PW"));
+ }
+
+ // PHP may need this, when compiled with security features
+ if (!env.hasVar("REDIRECT_STATUS")) {
+ env.putVar("REDIRECT_STATUS", "200");
+ }
+ }
+
+ return env;
+}
+
+
+std::string suPHP::Application::getInterpreter(
+ const Environment& env, const Configuration& config)
+ throw (SecurityException) {
+ if (!env.hasVar("SUPHP_HANDLER"))
+ throw SecurityException("Environment variable SUPHP_HANDLER not set",
+ __FILE__, __LINE__);
+ std::string handler = env.getVar("SUPHP_HANDLER");
+
+ std::string interpreter = "";
+ try {
+ interpreter = config.getInterpreter(handler);
+ } catch (KeyNotFoundException& e) {
+ throw SecurityException ("Handler not found in configuration", e,
+ __FILE__, __LINE__);
+ }
+
+ return interpreter;
+}
+
+
+TargetMode suPHP::Application::getTargetMode(const std::string& interpreter)
+ throw (SecurityException) {
+ if (interpreter.substr(0, 4) == "php:")
+ return TARGETMODE_PHP;
+ else if (interpreter == "execute:!self")
+ return TARGETMODE_SELFEXECUTE;
+ else
+ throw SecurityException("Unknown Interpreter: " + interpreter,
+ __FILE__, __LINE__);
+}
+
+
+void suPHP::Application::executeScript(const std::string& scriptFilename,
+ const std::string& interpreter,
+ TargetMode mode,
+ const Environment& env,
+ const Configuration& config) const
+ throw (SoftException) {
+ try {
+ // Change working directory to script path
+ API_Helper::getSystemAPI().setCwd(
+ File(scriptFilename).getParentDirectory().getPath());
+ if (mode == TARGETMODE_PHP) {
+ std::string interpreterPath = interpreter.substr(4);
+ CommandLine cline;
+ cline.putArgument(interpreterPath);
+ API_Helper::getSystemAPI().execute(interpreterPath, cline, env);
+ } else if (mode == TARGETMODE_SELFEXECUTE) {
+ CommandLine cline;
+ cline.putArgument(scriptFilename);
+ API_Helper::getSystemAPI().execute(scriptFilename, cline, env);
+ }
+ } catch (SystemException& e) {
+ throw SoftException("Could not execute script \"" + scriptFilename
+ + "\"", e, __FILE__, __LINE__);
+ }
+}
+
+
+int main(int argc, char **argv) {
+ try {
+ API& api = API_Helper::getSystemAPI();
+ CommandLine cmdline;
+ Environment env;
+ Application app;
+ for (int i=0; i<argc; i++) {
+ cmdline.putArgument(argv[i]);
+ }
+ env = api.getProcessEnvironment();
+ return app.run(cmdline, env);
+ } catch (Exception& e) {
+ std::cerr << e;
+ return 1;
+ }
+}
projects / manu / suphp.git / blobdiff