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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2016-2018 Phusion Holding B.V.
*
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* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/
#ifndef _PASSENGER_SPAWNING_KIT_HANDSHAKE_PREPARE_H_
#define _PASSENGER_SPAWNING_KIT_HANDSHAKE_PREPARE_H_
#include <oxt/backtrace.hpp>
#include <boost/thread.hpp>
#include <boost/scoped_array.hpp>
#include <string>
#include <vector>
#include <stdexcept>
#include <algorithm>
#include <utility>
#include <cerrno>
#include <cstddef>
#include <cassert>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <limits.h>
#include <jsoncpp/json.h>
#include <Constants.h>
#include <LoggingKit/LoggingKit.h>
#include <StaticString.h>
#include <Exceptions.h>
#include <FileTools/FileManip.h>
#include <FileTools/PathManip.h>
#include <SystemTools/UserDatabase.h>
#include <SystemTools/SystemTime.h>
#include <Utils/Timer.h>
#include <IOTools/IOUtils.h>
#include <StrIntTools/StrIntUtils.h>
#include <Core/SpawningKit/Context.h>
#include <Core/SpawningKit/Config.h>
#include <Core/SpawningKit/Journey.h>
#include <Core/SpawningKit/Exceptions.h>
#include <Core/SpawningKit/Handshake/Session.h>
#include <Core/SpawningKit/Handshake/WorkDir.h>
namespace Passenger {
namespace SpawningKit {
using namespace std;
using namespace oxt;
/**
* For an introduction see README.md, section
* "The preparation and the HandshakePrepare class".
*/
class HandshakePrepare {
private:
HandshakeSession &session;
Context * const context;
Config * const config;
Json::Value args;
Timer<SystemTime::GRAN_10MSEC> timer;
void resolveUserAndGroup() {
TRACE_POINT();
string username = config->user.toString(); // null terminate string
string groupname = config->group.toString(); // null terminate string
OsUser osUser;
OsGroup osGroup;
if (lookupSystemUserByName(username, osUser)) {
session.uid = osUser.pwd.pw_uid;
session.shell = osUser.pwd.pw_shell;
session.homedir = osUser.pwd.pw_dir;
} else {
if (looksLikePositiveNumber(username)) {
P_WARN("OS user account '" << username << "' does not exist."
" Will assume that this is a UID.");
session.uid = (uid_t) atoi(username);
} else {
throw RuntimeException("OS user account '" + username + "' does not exist");
}
}
if (lookupSystemGroupByName(groupname, osGroup)) {
session.gid = osGroup.grp.gr_gid;
} else {
if (looksLikePositiveNumber(groupname)) {
P_WARN("OS group account '" << groupname << "' does not exist."
" Will assume that this is a GID.");
session.gid = (gid_t) atoi(groupname);
} else {
throw RuntimeException("OS group account '" + groupname + "' does not exist");
}
}
}
void createWorkDir() {
TRACE_POINT();
session.workDir.reset(new HandshakeWorkDir(context->spawnDir));
session.envDumpDir = session.workDir->getPath() + "/envdump";
makeDirTree(session.envDumpDir,
"u=rwx,g=,o=",
session.uid,
session.gid);
makeDirTree(session.envDumpDir + "/annotations",
"u=rwx,g=,o=",
session.uid,
session.gid);
session.responseDir = session.workDir->getPath() + "/response";
makeDirTree(session.responseDir,
"u=rwx,g=,o=",
session.uid,
session.gid);
createFifo(session.responseDir + "/finish");
makeDirTree(session.responseDir + "/error",
"u=rwx,g=,o=",
session.uid,
session.gid);
makeDirTree(session.responseDir + "/steps",
"u=rwx,g=,o=",
session.uid,
session.gid);
createJourneyStepDirs(getFirstSubprocessJourneyStep(),
getLastSubprocessJourneyStep());
createJourneyStepDirs(getFirstPreloaderJourneyStep(),
// Also create directory for PRELOADER_FINISH;
// the preloader will want to write there.
JourneyStep((int) getLastPreloaderJourneyStep() + 1));
}
void createJourneyStepDirs(JourneyStep firstStep, JourneyStep lastStep) {
JourneyStep step;
for (step = firstStep; step < lastStep; step = JourneyStep((int) step + 1)) {
if (!session.journey.hasStep(step)) {
continue;
}
string stepString = journeyStepToStringLowerCase(step);
string stepDir = session.responseDir + "/steps/" + stepString;
makeDirTree(stepDir, "u=rwx,g=,o=", session.uid, session.gid);
}
}
void createFifo(const string &path) {
int ret;
do {
ret = mkfifo(path.c_str(), 0600);
} while (ret == -1 && errno == EINTR);
if (ret == -1) {
int e = errno;
throw FileSystemException("Cannot create FIFO file " + path,
e, path);
}
ret = syscalls::chown(path.c_str(),
session.uid,
session.gid);
if (ret == -1) {
int e = errno;
throw FileSystemException(
"Cannot change ownership for FIFO file " + path,
e, path);
}
}
// Open various workdir subdirectories because we'll use these file descriptors later in
// safeReadFile() calls.
void openWorkDirSubdirFds() {
session.workDirFd = openDirFd(session.workDir->getPath());
session.responseDirFd = openDirFd(session.responseDir);
session.responseErrorDirFd = openDirFd(session.responseDir + "/error");
session.envDumpDirFd = openDirFd(session.envDumpDir);
session.envDumpAnnotationsDirFd = openDirFd(session.envDumpDir + "/annotations");
openJourneyStepDirFds(getFirstSubprocessJourneyStep(),
getLastSubprocessJourneyStep());
openJourneyStepDirFds(getFirstPreloaderJourneyStep(),
JourneyStep((int) getLastPreloaderJourneyStep() + 1));
}
void openJourneyStepDirFds(JourneyStep firstStep, JourneyStep lastStep) {
JourneyStep step;
for (step = firstStep; step < lastStep; step = JourneyStep((int) step + 1)) {
if (!session.journey.hasStep(step)) {
continue;
}
string stepString = journeyStepToStringLowerCase(step);
string stepDir = session.responseDir + "/steps/" + stepString;
session.stepDirFds.insert(make_pair(step, openDirFd(stepDir)));
}
}
int openDirFd(const string &path) {
int fd = open(path.c_str(), O_RDONLY);
if (fd == -1) {
int e = errno;
throw FileSystemException("Cannot open " + path, e, path);
}
return fd;
}
void initializeResult() {
session.result.initialize(*context, config);
}
void preparePredefinedArgs() {
TRACE_POINT();
struct sockaddr_un addr;
args["passenger_root"] = context->resourceLocator->getInstallSpec();
args["passenger_version"] = PASSENGER_VERSION;
args["passenger_agent_path"] = context->resourceLocator->findSupportBinary(AGENT_EXE);
args["ruby_libdir"] = context->resourceLocator->getRubyLibDir();
args["node_libdir"] = context->resourceLocator->getNodeLibDir();
args["integration_mode"] = context->integrationMode;
args["gupid"] = session.result.gupid;
args["UNIX_PATH_MAX"] = (Json::UInt64) sizeof(addr.sun_path) - 1;
if (config->preloadBundler) {
args["preload_bundler"] = config->preloadBundler;
}
if (config->genericApp || config->findFreePort) {
args["expected_start_port"] = session.expectedStartPort;
}
if (!config->apiKey.empty()) {
args["connect_password"] = config->apiKey.toString();
}
if (!context->instanceDir.empty()) {
args["instance_dir"] = context->instanceDir;
args["socket_dir"] = context->instanceDir + "/apps.s";
}
}
void prepareArgsFromAppConfig() {
TRACE_POINT();
const Json::Value appConfigJson = config->getConfidentialFieldsToPassToApp();
Json::Value::const_iterator it, end = appConfigJson.end();
for (it = appConfigJson.begin(); it != end; it++) {
args[it.name()] = *it;
}
}
void absolutizeKeyArgPaths() {
TRACE_POINT();
args["app_root"] = absolutizePath(args["app_root"].asString());
if (args.isMember("startup_file")) {
args["startup_file"] = absolutizePath(args["startup_file"].asString(),
args["app_root"].asString());
}
}
void dumpArgsIntoWorkDir() {
TRACE_POINT();
P_DEBUG("[App spawn arg] " << args.toStyledString());
// The workDir is a new random dir. the files that we create here
// should not exist, so if any exist then have createFile()
// throw an error because it could be a bug or an attack.
createFile(session.workDir->getPath() + "/args.json",
args.toStyledString(), 0600,
session.uid, session.gid,
false, __FILE__, __LINE__);
const string dir = session.workDir->getPath() + "/args";
makeDirTree(dir, "u=rwx,g=,o=",
session.uid,
session.gid);
const Json::Value &constArgs = const_cast<const Json::Value &>(args);
Json::Value::const_iterator it, end = constArgs.end();
for (it = constArgs.begin(); it != end; it++) {
const Json::Value &value = *it;
switch (value.type()) {
case Json::nullValue:
case Json::intValue:
case Json::uintValue:
case Json::realValue:
case Json::stringValue:
case Json::booleanValue:
createFile(dir + "/" + it.name(),
jsonValueToString(*it),
0600, session.uid, session.gid,
false, __FILE__, __LINE__);
break;
default:
createFile(dir + "/" + it.name() + ".json",
jsonValueToString(*it),
0600, session.uid, session.gid,
false, __FILE__, __LINE__);
break;
}
}
}
string jsonValueToString(const Json::Value &value) const {
switch (value.type()) {
case Json::nullValue:
return string();
case Json::intValue:
return toString(value.asInt64());
case Json::uintValue:
return toString(value.asUInt64());
case Json::realValue:
return toString(value.asDouble());
case Json::stringValue:
return value.asString();
case Json::booleanValue:
if (value.asBool()) {
return "true";
} else {
return "false";
}
default:
return value.toStyledString();
}
}
#if 0
void inferApplicationInfo() const {
TRACE_POINT();
session.result.codeRevision = readFromRevisionFile();
if (session.result.codeRevision.empty()) {
session.result.codeRevision = inferCodeRevisionFromCapistranoSymlink();
}
}
string readFromRevisionFile() const {
TRACE_POINT();
string filename = config->appRoot + "/REVISION";
try {
if (fileExists(filename)) {
return strip(readAll(filename));
}
} catch (const SystemException &e) {
P_WARN("Cannot access " << filename << ": " << e.what());
}
return string();
}
string inferCodeRevisionFromCapistranoSymlink() const {
TRACE_POINT();
if (extractBaseName(config->appRoot) == "current") {
string appRoot = config->appRoot.toString(); // null terminate string
char buf[PATH_MAX + 1];
ssize_t ret;
do {
ret = readlink(appRoot.c_str(), buf, PATH_MAX);
} while (ret == -1 && errno == EINTR);
if (ret == -1) {
if (errno == EINVAL) {
return string();
} else {
int e = errno;
P_WARN("Cannot read symlink " << appRoot << ": " << strerror(e));
}
}
buf[ret] = '\0';
return extractBaseName(buf);
} else {
return string();
}
}
#endif
void findFreePortOrSocketFile() {
TRACE_POINT();
session.expectedStartPort = findFreePort();
if (session.expectedStartPort == 0) {
throwSpawnExceptionBecauseOfFailureToFindFreePort();
}
// TODO: support Unix domain sockets in the future
// session.expectedStartSocketFile = findFreeSocketFile();
}
unsigned int findFreePort() {
TRACE_POINT();
unsigned int tryCount = 1;
unsigned int maxTries;
while (true) {
unsigned int port;
boost::this_thread::interruption_point();
{
boost::lock_guard<boost::mutex> l(context->syncher);
port = context->nextPort;
context->nextPort++;
if (context->nextPort > context->maxPortRange) {
context->nextPort = context->minPortRange;
}
maxTries = context->maxPortRange -
context->minPortRange + 1;
}
unsigned long long timeout1 = 100000;
unsigned long long timeout2 = 100000;
if (!pingTcpServer("127.0.0.1", port, &timeout1)
&& !pingTcpServer("0.0.0.0", port, &timeout2))
{
return port;
} else if (tryCount >= maxTries) {
return 0;
} else if (timer.usecElapsed() >= session.timeoutUsec) {
throwSpawnExceptionBecauseOfPortFindingTimeout();
} // else: try again
}
}
void adjustTimeout() {
unsigned long long elapsed = timer.usecElapsed();
if (elapsed >= session.timeoutUsec) {
session.timeoutUsec = 0;
} else {
session.timeoutUsec -= elapsed;
}
}
void throwSpawnExceptionBecauseOfPortFindingTimeout() {
assert(config->genericApp || config->findFreePort);
SpawnException e(TIMEOUT_ERROR, session.journey, config);
e.setProblemDescriptionHTML(
"<p>The " PROGRAM_NAME " application server tried"
" to look for a free TCP port for the web application"
" to start on. But this took too much time, so "
SHORT_PROGRAM_NAME " put a stop to that.</p>");
unsigned int minPortRange, maxPortRange;
{
boost::lock_guard<boost::mutex> l(context->syncher);
minPortRange = context->minPortRange;
maxPortRange = context->maxPortRange;
}
e.setSolutionDescriptionHTML(
"<div class=\"multiple-solutions\">"
"<h3>Check whether the server is low on resources</h3>"
"<p>Maybe the server is currently so low on resources that"
" all the work that needed to be done, could not finish within"
" the given time limit."
" Please inspect the server resource utilization statistics"
" in the <em>diagnostics</em> section to verify"
" whether server is indeed low on resources.</p>"
"<p>If so, then either increase the spawn timeout (currently"
" configured at " + toString(config->startTimeoutMsec / 1000)
+ " sec), or find a way to lower the server's resource"
" utilization.</p>"
"<h3>Limit the port range that " SHORT_PROGRAM_NAME " searches in</h3>"
"<p>Maybe the port range in which " SHORT_PROGRAM_NAME
" tried to search for a free port for the application is"
" large, and at the same time there were very few free ports"
" available.</p>"
"<p>If this is the case, then please configure the "
SHORT_PROGRAM_NAME " application spawning port range"
" to a range that is known to have many free ports. The port"
" range is currently configured at " + toString(minPortRange)
+ "-" + toString(maxPortRange) + ".</p>"
"</div>"
);
throw e.finalize();
}
void throwSpawnExceptionBecauseOfFailureToFindFreePort() {
assert(config->genericApp || config->findFreePort);
unsigned int minPortRange, maxPortRange;
{
boost::lock_guard<boost::mutex> l(context->syncher);
minPortRange = context->minPortRange;
maxPortRange = context->maxPortRange;
}
SpawnException e(INTERNAL_ERROR, session.journey, config);
e.setSummary("Could not find a free port to spawn the application on.");
e.setProblemDescriptionHTML(
"<p>The " PROGRAM_NAME " application server tried"
" to look for a free TCP port for the web application"
" to start on, but was unable to find one.</p>");
e.setSolutionDescriptionHTML(
"<div class=\"sole-solutions\">"
"<p>Maybe the port range in which " SHORT_PROGRAM_NAME
" tried to search for a free port, had very few or no"
" free ports.</p>"
"<p>If this is the case, then please configure the "
SHORT_PROGRAM_NAME " application spawning port range"
" to a range that is known to have many free ports. The port"
" range is currently configured at " + toString(minPortRange)
+ "-" + toString(maxPortRange) + ".</p>"
"</div>");
throw e.finalize();
}
public:
struct DebugSupport {
virtual ~DebugSupport() { }
virtual void beforeAdjustTimeout() { }
};
DebugSupport *debugSupport;
HandshakePrepare(HandshakeSession &_session,
const Json::Value &extraArgs = Json::Value())
: session(_session),
context(_session.context),
config(_session.config),
args(extraArgs),
timer(false),
debugSupport(NULL)
{
assert(_session.context != NULL);
assert(_session.context->isFinalized());
assert(_session.config != NULL);
}
HandshakePrepare &execute() {
TRACE_POINT();
// We do not set SPAWNING_KIT_PREPARATION to the IN_PROGRESS or
// PERFORMED state here. That will be done by the caller because
// it may want to perform additional preparation.
try {
timer.start();
resolveUserAndGroup();
createWorkDir();
openWorkDirSubdirFds();
initializeResult();
UPDATE_TRACE_POINT();
// Disabled to fix CVE-2017-16355
//inferApplicationInfo();
if (config->genericApp || config->findFreePort) {
findFreePortOrSocketFile();
}
UPDATE_TRACE_POINT();
preparePredefinedArgs();
prepareArgsFromAppConfig();
absolutizeKeyArgPaths();
dumpArgsIntoWorkDir();
if (debugSupport != NULL) {
debugSupport->beforeAdjustTimeout();
}
adjustTimeout();
} catch (const SpawnException &) {
session.journey.setStepErrored(SPAWNING_KIT_PREPARATION);
throw;
} catch (const std::exception &e) {
session.journey.setStepErrored(SPAWNING_KIT_PREPARATION);
throw SpawnException(e, session.journey, config).finalize();
}
return *this;
}
void finalize() {
session.workDir->finalize(session.uid, session.gid);
}
};
} // namespace SpawningKit
} // namespace Passenger
#endif /* _PASSENGER_SPAWNING_KIT_HANDSHAKE_PREPARE_H_ */
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