592 lines
18 KiB
C++
592 lines
18 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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/*
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* A very simple, single threaded helper to efficiently pre-init and
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* spawn lots of kits as children.
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*/
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#include <config.h>
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#include <sys/capability.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sysexits.h>
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#include <atomic>
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#include <cstdlib>
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#include <cstring>
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#include <iostream>
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#include <map>
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#include <Poco/Path.h>
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#include <Poco/Process.h>
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#include <Poco/Thread.h>
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#include <Common.hpp>
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#include <IoUtil.hpp>
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#include "Kit.hpp"
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#include <Log.hpp>
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#include <Unit.hpp>
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#include <Util.hpp>
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#include <common/FileUtil.hpp>
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#include <common/Seccomp.hpp>
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#include <common/SigUtil.hpp>
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#include <security.h>
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using Poco::Process;
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using Poco::Thread;
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#ifndef KIT_IN_PROCESS
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static bool NoCapsForKit = false;
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static bool NoSeccomp = false;
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#endif
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static bool DisplayVersion = false;
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static std::string UnitTestLibrary;
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static std::string LogLevel;
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static std::atomic<unsigned> ForkCounter(0);
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static std::map<Process::PID, std::string> childJails;
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#ifndef KIT_IN_PROCESS
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int ClientPortNumber = DEFAULT_CLIENT_PORT_NUMBER;
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std::string MasterLocation;
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#endif
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/// Dispatcher class to demultiplex requests from
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/// WSD and handles them.
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class CommandDispatcher : public IoUtil::PipeReader
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{
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public:
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CommandDispatcher(const int pipe) :
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PipeReader("wsd_pipe_rd", pipe)
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{
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}
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/// Polls WSD commands and handles them.
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bool pollAndDispatch()
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{
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std::string message;
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const int ready = readLine(message, [](){ return SigUtil::getTerminationFlag(); });
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if (ready <= 0)
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{
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// Termination is done via SIGTERM, which breaks the wait.
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if (ready < 0)
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{
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if (SigUtil::getTerminationFlag())
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{
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LOG_INF("Poll interrupted in " << getName() << " and TerminationFlag is set.");
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}
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// Break.
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return false;
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}
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// Timeout.
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return true;
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}
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LOG_INF("ForKit command: [" << message << "].");
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try
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{
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std::vector<std::string> tokens = LOOLProtocol::tokenize(message);
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if (tokens.size() == 2 && tokens[0] == "spawn")
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{
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const int count = std::stoi(tokens[1]);
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if (count > 0)
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{
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LOG_INF("Setting to spawn " << tokens[1] << " child" << (count == 1 ? "" : "ren") << " per request.");
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ForkCounter = count;
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}
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else
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{
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LOG_WRN("Cannot spawn " << tokens[1] << " children as requested.");
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}
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}
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else if (tokens.size() == 3 && tokens[0] == "setconfig")
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{
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// Currently only rlimit entries are supported.
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if (!Rlimit::handleSetrlimitCommand(tokens))
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{
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LOG_ERR("Unknown setconfig command: " << message);
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}
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}
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else
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{
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LOG_ERR("Unknown command: " << message);
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}
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}
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catch (const std::exception& exc)
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{
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LOG_ERR("Error while processing forkit request [" << message << "]: " << exc.what());
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}
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return true;
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}
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};
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#ifndef KIT_IN_PROCESS
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static bool haveCapability(cap_value_t capability)
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{
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cap_t caps = cap_get_proc();
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if (caps == nullptr)
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{
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LOG_SFL("cap_get_proc() failed.");
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return false;
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}
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char *cap_name = cap_to_name(capability);
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cap_flag_value_t value;
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if (cap_get_flag(caps, capability, CAP_EFFECTIVE, &value) == -1)
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{
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if (cap_name)
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{
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LOG_SFL("cap_get_flag failed for " << cap_name << ".");
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cap_free(cap_name);
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}
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else
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{
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LOG_SFL("cap_get_flag failed for capability " << capability << ".");
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}
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return false;
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}
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if (value != CAP_SET)
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{
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if (cap_name)
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{
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LOG_FTL("Capability " << cap_name << " is not set for the loolforkit program.");
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cap_free(cap_name);
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}
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else
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{
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LOG_ERR("Capability " << capability << " is not set for the loolforkit program.");
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}
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return false;
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}
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if (cap_name)
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{
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LOG_INF("Have capability " << cap_name);
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cap_free(cap_name);
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}
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else
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{
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LOG_INF("Have capability " << capability);
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}
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return true;
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}
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static bool haveCorrectCapabilities()
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{
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bool result = true;
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// Do check them all, don't shortcut with &&
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if (!haveCapability(CAP_SYS_CHROOT))
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result = false;
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if (!haveCapability(CAP_MKNOD))
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result = false;
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if (!haveCapability(CAP_FOWNER))
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result = false;
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return result;
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}
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#endif
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/// Check if some previously forked kids have died.
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static void cleanupChildren()
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{
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std::vector<std::string> jails;
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Process::PID exitedChildPid;
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int status;
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// Reap quickly without doing slow cleanup so WSD can spawn more rapidly.
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while ((exitedChildPid = waitpid(-1, &status, WUNTRACED | WNOHANG)) > 0)
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{
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const auto it = childJails.find(exitedChildPid);
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if (it != childJails.end())
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{
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LOG_INF("Child " << exitedChildPid << " has exited, will remove its jail [" << it->second << "].");
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jails.emplace_back(it->second);
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childJails.erase(it);
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if (childJails.empty() && !SigUtil::getTerminationFlag())
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{
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// We ran out of kits and we aren't terminating.
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LOG_WRN("No live Kits exist, and we are not terminating yet.");
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}
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}
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else
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{
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LOG_ERR("Unknown child " << exitedChildPid << " has exited");
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}
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}
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// Now delete the jails.
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for (const auto& path : jails)
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{
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LOG_INF("Removing jail [" << path << "].");
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FileUtil::removeFile(path, true);
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}
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}
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static int createLibreOfficeKit(const std::string& childRoot,
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const std::string& sysTemplate,
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const std::string& loTemplate,
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const std::string& loSubPath,
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bool queryVersion = false)
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{
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// Generate a jail ID to be used for in the jail path.
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const std::string jailId = Util::rng::getFilename(16);
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// Used to label the spare kit instances
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static size_t spareKitId = 0;
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++spareKitId;
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LOG_DBG("Forking a loolkit process with jailId: " << jailId << " as spare loolkit #" << spareKitId << ".");
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const Process::PID pid = fork();
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if (!pid)
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{
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// Child
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// Close the pipe from loolwsd
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close(0);
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#ifndef KIT_IN_PROCESS
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UnitKit::get().postFork();
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#endif
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if (std::getenv("SLEEPKITFORDEBUGGER"))
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{
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const size_t delaySecs = std::stoul(std::getenv("SLEEPKITFORDEBUGGER"));
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if (delaySecs > 0)
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{
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std::cerr << "Kit: Sleeping " << delaySecs
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<< " seconds to give you time to attach debugger to process "
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<< Process::id() << std::endl;
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Thread::sleep(delaySecs * 1000);
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}
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}
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#ifndef KIT_IN_PROCESS
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lokit_main(childRoot, jailId, sysTemplate, loTemplate, loSubPath, NoCapsForKit, NoSeccomp, queryVersion, DisplayVersion, spareKitId);
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#else
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lokit_main(childRoot, jailId, sysTemplate, loTemplate, loSubPath, true, true, queryVersion, DisplayVersion, spareKitId);
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#endif
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}
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else
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{
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// Parent
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if (pid < 0)
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{
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LOG_SYS("Fork failed.");
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}
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else
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{
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LOG_INF("Forked kit [" << pid << "].");
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childJails[pid] = childRoot + jailId;
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}
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#ifndef KIT_IN_PROCESS
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UnitKit::get().launchedKit(pid);
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#endif
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}
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return pid;
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}
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void forkLibreOfficeKit(const std::string& childRoot,
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const std::string& sysTemplate,
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const std::string& loTemplate,
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const std::string& loSubPath,
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int limit)
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{
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// Cleanup first, to reduce disk load.
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cleanupChildren();
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#ifndef KIT_IN_PROCESS
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(void) limit;
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#else
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if (limit > 0)
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ForkCounter = limit;
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#endif
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if (ForkCounter > 0)
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{
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// Create as many as requested.
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const size_t count = ForkCounter;
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LOG_INF("Spawning " << count << " new child" << (count == 1 ? "." : "ren."));
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const size_t retry = count * 2;
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for (size_t i = 0; ForkCounter > 0 && i < retry; ++i)
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{
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if (ForkCounter-- <= 0 || createLibreOfficeKit(childRoot, sysTemplate, loTemplate, loSubPath) < 0)
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{
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LOG_ERR("Failed to create a kit process.");
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++ForkCounter;
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}
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}
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}
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}
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#ifndef KIT_IN_PROCESS
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static void printArgumentHelp()
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{
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std::cout << "Usage: loolforkit [OPTION]..." << std::endl;
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std::cout << " Single-threaded process that spawns lok instances" << std::endl;
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std::cout << " Note: Running this standalone is not possible. It is spawned by loolwsd" << std::endl;
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std::cout << " and is controlled via a pipe." << std::endl;
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std::cout << "" << std::endl;
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}
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int main(int argc, char** argv)
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{
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if (!hasCorrectUID("loolforkit"))
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{
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return EX_SOFTWARE;
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}
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if (std::getenv("SLEEPFORDEBUGGER"))
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{
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const size_t delaySecs = std::stoul(std::getenv("SLEEPFORDEBUGGER"));
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if (delaySecs > 0)
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{
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std::cerr << "Forkit: Sleeping " << delaySecs
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<< " seconds to give you time to attach debugger to process "
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<< Process::id() << std::endl;
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Thread::sleep(delaySecs * 1000);
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}
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}
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#ifndef FUZZER
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SigUtil::setFatalSignals();
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SigUtil::setTerminationSignals();
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#endif
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Util::setThreadName("forkit");
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// Initialization
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const bool logToFile = std::getenv("LOOL_LOGFILE");
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const char* logFilename = std::getenv("LOOL_LOGFILENAME");
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const char* logLevel = std::getenv("LOOL_LOGLEVEL");
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const char* logColor = std::getenv("LOOL_LOGCOLOR");
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std::map<std::string, std::string> logProperties;
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if (logToFile && logFilename)
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{
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logProperties["path"] = std::string(logFilename);
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}
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Log::initialize("frk", "trace", logColor != nullptr, logToFile, logProperties);
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LogLevel = logLevel ? logLevel : "trace";
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if (LogLevel != "trace")
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{
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LOG_INF("Setting log-level to [trace] and delaying setting to configured [" << LogLevel << "] until after Forkit initialization.");
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}
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std::string childRoot;
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std::string loSubPath;
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std::string sysTemplate;
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std::string loTemplate;
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for (int i = 0; i < argc; ++i)
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{
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char *cmd = argv[i];
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char *eq;
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if (std::strstr(cmd, "--losubpath=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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loSubPath = std::string(eq+1);
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}
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else if (std::strstr(cmd, "--systemplate=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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sysTemplate = std::string(eq+1);
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}
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else if (std::strstr(cmd, "--lotemplate=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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loTemplate = std::string(eq+1);
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}
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else if (std::strstr(cmd, "--childroot=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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childRoot = std::string(eq+1);
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}
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else if (std::strstr(cmd, "--clientport=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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ClientPortNumber = std::stoll(std::string(eq+1));
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}
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else if (std::strstr(cmd, "--masterport=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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MasterLocation = std::string(eq+1);
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}
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else if (std::strstr(cmd, "--version") == cmd)
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{
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std::string version, hash;
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Util::getVersionInfo(version, hash);
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std::cout << "loolforkit version details: " << version << " - " << hash << std::endl;
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DisplayVersion = true;
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}
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else if (std::strstr(cmd, "--rlimits") == cmd)
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{
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eq = std::strchr(cmd, '=');
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const std::string rlimits = std::string(eq+1);
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std::vector<std::string> tokens = LOOLProtocol::tokenize(rlimits, ';');
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for (const std::string& cmdLimit : tokens)
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{
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const std::pair<std::string, std::string> pair = Util::split(cmdLimit, ':');
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std::vector<std::string> tokensLimit = { "setconfig", pair.first, pair.second };
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if (!Rlimit::handleSetrlimitCommand(tokensLimit))
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{
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LOG_ERR("Unknown rlimits command: " << cmdLimit);
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}
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}
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}
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#if ENABLE_DEBUG
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// this process has various privileges - don't run arbitrary code.
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else if (std::strstr(cmd, "--unitlib=") == cmd)
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{
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eq = std::strchr(cmd, '=');
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UnitTestLibrary = std::string(eq+1);
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}
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#endif
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// we are running in a lower-privilege mode - with no chroot
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else if (std::strstr(cmd, "--nocaps") == cmd)
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{
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LOG_ERR("Security: Running without the capability to enter a chroot jail is ill advised.");
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NoCapsForKit = true;
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}
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// we are running without seccomp protection
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else if (std::strstr(cmd, "--noseccomp") == cmd)
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{
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LOG_ERR("Security :Running without the ability to filter system calls is ill advised.");
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NoSeccomp = true;
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}
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}
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if (loSubPath.empty() || sysTemplate.empty() ||
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loTemplate.empty() || childRoot.empty())
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{
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printArgumentHelp();
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return EX_USAGE;
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}
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if (!UnitBase::init(UnitBase::UnitType::Kit,
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UnitTestLibrary))
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{
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LOG_ERR("Failed to load kit unit test library");
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return EX_USAGE;
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}
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// Setup & check environment
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const std::string layers(
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"xcsxcu:${BRAND_BASE_DIR}/share/registry "
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"res:${BRAND_BASE_DIR}/share/registry "
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"bundledext:${${BRAND_BASE_DIR}/program/lounorc:BUNDLED_EXTENSIONS_USER}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
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"sharedext:${${BRAND_BASE_DIR}/program/lounorc:SHARED_EXTENSIONS_USER}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
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"userext:${${BRAND_BASE_DIR}/program/lounorc:UNO_USER_PACKAGES_CACHE}/registry/com.sun.star.comp.deployment.configuration.PackageRegistryBackend/configmgr.ini "
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#if ENABLE_DEBUG // '*' denotes non-writable.
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"user:*file://" DEBUG_ABSSRCDIR "/loolkitconfig.xcu "
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#else
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"user:*file://" LOOLWSD_CONFIGDIR "/loolkitconfig.xcu "
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#endif
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);
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// No-caps tracing can spawn eg. glxinfo & other oddness.
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unsetenv("DISPLAY");
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::setenv("CONFIGURATION_LAYERS", layers.c_str(),
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1 /* override */);
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if (!std::getenv("LD_BIND_NOW")) // must be set by parent.
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LOG_INF("Note: LD_BIND_NOW is not set.");
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if (!NoCapsForKit && !haveCorrectCapabilities())
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{
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std::cerr << "FATAL: Capabilities are not set for the loolforkit program." << std::endl;
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std::cerr << "Please make sure that the current partition was *not* mounted with the 'nosuid' option." << std::endl;
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std::cerr << "If you are on SLES11, please set 'file_caps=1' as kernel boot option." << std::endl << std::endl;
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return EX_SOFTWARE;
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}
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// Set various options we need.
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std::string options = "unipoll";
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if (Log::logger().trace())
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options += ":profile_events";
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// options += ":sc_no_grid_bg"; // leave ths disabled for now, merged-cells needs more work.
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::setenv("SAL_LOK_OPTIONS", options.c_str(), 0);
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|
// Initialize LoKit
|
|
if (!globalPreinit(loTemplate))
|
|
{
|
|
LOG_FTL("Failed to preinit lokit.");
|
|
Log::shutdown();
|
|
std::_Exit(EX_SOFTWARE);
|
|
}
|
|
|
|
if (Util::getProcessThreadCount() != 1)
|
|
LOG_ERR("Error: forkit has more than a single thread after pre-init");
|
|
|
|
LOG_INF("Preinit stage OK.");
|
|
|
|
// We must have at least one child, more are created dynamically.
|
|
// Ask this first child to send version information to master process and trace startup.
|
|
::setenv("LOOL_TRACE_STARTUP", "1", 1);
|
|
Process::PID forKitPid = createLibreOfficeKit(childRoot, sysTemplate, loTemplate, loSubPath, true);
|
|
if (forKitPid < 0)
|
|
{
|
|
LOG_FTL("Failed to create a kit process.");
|
|
Log::shutdown();
|
|
std::_Exit(EX_SOFTWARE);
|
|
}
|
|
|
|
// No need to trace subsequent children.
|
|
::unsetenv("LOOL_TRACE_STARTUP");
|
|
if (LogLevel != "trace")
|
|
{
|
|
LOG_INF("Forkit initialization complete: setting log-level to [" << LogLevel << "] as configured.");
|
|
Log::logger().setLevel(LogLevel);
|
|
}
|
|
|
|
CommandDispatcher commandDispatcher(0);
|
|
LOG_INF("ForKit process is ready.");
|
|
|
|
while (!SigUtil::getTerminationFlag())
|
|
{
|
|
UnitKit::get().invokeForKitTest();
|
|
|
|
if (!commandDispatcher.pollAndDispatch())
|
|
{
|
|
LOG_INF("Child dispatcher flagged for termination.");
|
|
break;
|
|
}
|
|
|
|
forkLibreOfficeKit(childRoot, sysTemplate, loTemplate, loSubPath);
|
|
}
|
|
|
|
int returnValue = EX_OK;
|
|
UnitKit::get().returnValue(returnValue);
|
|
|
|
#if 0
|
|
int status = 0;
|
|
waitpid(forKitPid, &status, WUNTRACED);
|
|
#endif
|
|
|
|
LOG_INF("ForKit process finished.");
|
|
Log::shutdown();
|
|
std::_Exit(returnValue);
|
|
}
|
|
#endif
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|