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/*
Derived from source code of TrueCrypt 7.1a, which is
Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
by the TrueCrypt License 3.0.
Modifications and additions to the original source code (contained in this file)
and all other portions of this file are Copyright (c) 2013-2017 IDRIX
and are governed by the Apache License 2.0 the full text of which is
contained in the file License.txt included in VeraCrypt binary and source
code distribution packages.
*/
#include "CoreService.h"
#include <fcntl.h>
#include <sys/wait.h>
#include "Platform/FileStream.h"
#include "Platform/MemoryStream.h"
#include "Platform/Serializable.h"
#include "Platform/SystemLog.h"
#include "Platform/Thread.h"
#include "Platform/Unix/Poller.h"
#include "Core/Core.h"
#include "CoreUnix.h"
#include "CoreServiceRequest.h"
#include "CoreServiceResponse.h"
namespace VeraCrypt
{
template <class T>
auto_ptr <T> CoreService::GetResponse ()
{
auto_ptr <Serializable> deserializedObject (Serializable::DeserializeNew (ServiceOutputStream));
Exception *deserializedException = dynamic_cast <Exception*> (deserializedObject.get());
if (deserializedException)
deserializedException->Throw();
if (dynamic_cast <T *> (deserializedObject.get()) == nullptr)
throw ParameterIncorrect (SRC_POS);
return auto_ptr <T> (dynamic_cast <T *> (deserializedObject.release()));
}
void CoreService::ProcessElevatedRequests ()
{
int pid = fork();
throw_sys_if (pid == -1);
if (pid == 0)
{
try
{
int f = open ("/dev/null", 0);
throw_sys_sub_if (f == -1, "/dev/null");
throw_sys_if (dup2 (f, STDERR_FILENO) == -1);
// Wait for sync code
while (true)
{
byte b;
throw_sys_if (read (STDIN_FILENO, &b, 1) != 1);
if (b != 0x00)
continue;
throw_sys_if (read (STDIN_FILENO, &b, 1) != 1);
if (b != 0x11)
continue;
throw_sys_if (read (STDIN_FILENO, &b, 1) != 1);
if (b == 0x22)
break;
}
ElevatedPrivileges = true;
ProcessRequests (STDIN_FILENO, STDOUT_FILENO);
_exit (0);
}
catch (exception &e)
{
#ifdef DEBUG
SystemLog::WriteException (e);
#endif
}
catch (...) { }
_exit (1);
}
}
void CoreService::ProcessRequests (int inputFD, int outputFD)
{
try
{
Core = CoreDirect;
shared_ptr <Stream> inputStream (new FileStream (inputFD != -1 ? inputFD : InputPipe->GetReadFD()));
shared_ptr <Stream> outputStream (new FileStream (outputFD != -1 ? outputFD : OutputPipe->GetWriteFD()));
while (true)
{
shared_ptr <CoreServiceRequest> request = Serializable::DeserializeNew <CoreServiceRequest> (inputStream);
try
{
// ExitRequest
if (dynamic_cast <ExitRequest*> (request.get()) != nullptr)
{
if (ElevatedServiceAvailable)
request->Serialize (ServiceInputStream);
return;
}
if (!ElevatedPrivileges && request->ElevateUserPrivileges)
{
if (!ElevatedServiceAvailable)
{
finally_do_arg (string *, &request->AdminPassword, { StringConverter::Erase (*finally_arg); });
CoreService::StartElevated (*request);
ElevatedServiceAvailable = true;
}
request->Serialize (ServiceInputStream);
GetResponse <Serializable>()->Serialize (outputStream);
continue;
}
// CheckFilesystemRequest
CheckFilesystemRequest *checkRequest = dynamic_cast <CheckFilesystemRequest*> (request.get());
if (checkRequest)
{
Core->CheckFilesystem (checkRequest->MountedVolumeInfo, checkRequest->Repair);
CheckFilesystemResponse().Serialize (outputStream);
continue;
}
// DismountFilesystemRequest
DismountFilesystemRequest *dismountFsRequest = dynamic_cast <DismountFilesystemRequest*> (request.get());
if (dismountFsRequest)
{
Core->DismountFilesystem (dismountFsRequest->MountPoint, dismountFsRequest->Force);
DismountFilesystemResponse().Serialize (outputStream);
continue;
}
// DismountVolumeRequest
DismountVolumeRequest *dismountRequest = dynamic_cast <DismountVolumeRequest*> (request.get());
if (dismountRequest)
{
DismountVolumeResponse response;
response.DismountedVolumeInfo = Core->DismountVolume (dismountRequest->MountedVolumeInfo, dismountRequest->IgnoreOpenFiles, dismountRequest->SyncVolumeInfo);
response.Serialize (outputStream);
continue;
}
// GetDeviceSectorSizeRequest
GetDeviceSectorSizeRequest *getDeviceSectorSizeRequest = dynamic_cast <GetDeviceSectorSizeRequest*> (request.get());
if (getDeviceSectorSizeRequest)
{
GetDeviceSectorSizeResponse response;
response.Size = Core->GetDeviceSectorSize (getDeviceSectorSizeRequest->Path);
response.Serialize (outputStream);
continue;
}
// GetDeviceSizeRequest
GetDeviceSizeRequest *getDeviceSizeRequest = dynamic_cast <GetDeviceSizeRequest*> (request.get());
if (getDeviceSizeRequest)
{
GetDeviceSizeResponse response;
response.Size = Core->GetDeviceSize (getDeviceSizeRequest->Path);
response.Serialize (outputStream);
continue;
}
// GetHostDevicesRequest
GetHostDevicesRequest *getHostDevicesRequest = dynamic_cast <GetHostDevicesRequest*> (request.get());
if (getHostDevicesRequest)
{
GetHostDevicesResponse response;
response.HostDevices = Core->GetHostDevices (getHostDevicesRequest->PathListOnly);
response.Serialize (outputStream);
continue;
}
// MountVolumeRequest
MountVolumeRequest *mountRequest = dynamic_cast <MountVolumeRequest*> (request.get());
if (mountRequest)
{
MountVolumeResponse (
Core->MountVolume (*mountRequest->Options)
).Serialize (outputStream);
continue;
}
// SetFileOwnerRequest
SetFileOwnerRequest *setFileOwnerRequest = dynamic_cast <SetFileOwnerRequest*> (request.get());
if (setFileOwnerRequest)
{
CoreUnix *coreUnix = dynamic_cast <CoreUnix *> (Core.get());
if (!coreUnix)
throw ParameterIncorrect (SRC_POS);
coreUnix->SetFileOwner (setFileOwnerRequest->Path, setFileOwnerRequest->Owner);
SetFileOwnerResponse().Serialize (outputStream);
continue;
}
throw ParameterIncorrect (SRC_POS);
}
catch (Exception &e)
{
e.Serialize (outputStream);
}
catch (exception &e)
{
ExternalException (SRC_POS, StringConverter::ToExceptionString (e)).Serialize (outputStream);
}
}
}
catch (exception &e)
{
#ifdef DEBUG
SystemLog::WriteException (e);
#endif
throw;
}
}
void CoreService::RequestCheckFilesystem (shared_ptr <VolumeInfo> mountedVolume, bool repair)
{
CheckFilesystemRequest request (mountedVolume, repair);
SendRequest <CheckFilesystemResponse> (request);
}
void CoreService::RequestDismountFilesystem (const DirectoryPath &mountPoint, bool force)
{
DismountFilesystemRequest request (mountPoint, force);
SendRequest <DismountFilesystemResponse> (request);
}
shared_ptr <VolumeInfo> CoreService::RequestDismountVolume (shared_ptr <VolumeInfo> mountedVolume, bool ignoreOpenFiles, bool syncVolumeInfo)
{
DismountVolumeRequest request (mountedVolume, ignoreOpenFiles, syncVolumeInfo);
return SendRequest <DismountVolumeResponse> (request)->DismountedVolumeInfo;
}
uint32 CoreService::RequestGetDeviceSectorSize (const DevicePath &devicePath)
{
GetDeviceSectorSizeRequest request (devicePath);
return SendRequest <GetDeviceSectorSizeResponse> (request)->Size;
}
uint64 CoreService::RequestGetDeviceSize (const DevicePath &devicePath)
{
GetDeviceSizeRequest request (devicePath);
return SendRequest <GetDeviceSizeResponse> (request)->Size;
}
HostDeviceList CoreService::RequestGetHostDevices (bool pathListOnly)
{
GetHostDevicesRequest request (pathListOnly);
return SendRequest <GetHostDevicesResponse> (request)->HostDevices;
}
shared_ptr <VolumeInfo> CoreService::RequestMountVolume (MountOptions &options)
{
MountVolumeRequest request (&options);
return SendRequest <MountVolumeResponse> (request)->MountedVolumeInfo;
}
void CoreService::RequestSetFileOwner (const FilesystemPath &path, const UserId &owner)
{
SetFileOwnerRequest request (path, owner);
SendRequest <SetFileOwnerResponse> (request);
}
template <class T>
auto_ptr <T> CoreService::SendRequest (CoreServiceRequest &request)
{
static Mutex mutex;
ScopeLock lock (mutex);
if (request.RequiresElevation())
{
request.ElevateUserPrivileges = true;
request.FastElevation = !ElevatedServiceAvailable;
request.ApplicationExecutablePath = Core->GetApplicationExecutablePath();
while (!ElevatedServiceAvailable)
{
try
{
request.Serialize (ServiceInputStream);
auto_ptr <T> response (GetResponse <T>());
ElevatedServiceAvailable = true;
return response;
}
catch (ElevationFailed &e)
{
if (!request.FastElevation)
{
ExceptionEventArgs args (e);
Core->WarningEvent.Raise (args);
}
request.FastElevation = false;
(*AdminPasswordCallback) (request.AdminPassword);
}
}
}
finally_do_arg (string *, &request.AdminPassword, { StringConverter::Erase (*finally_arg); });
request.Serialize (ServiceInputStream);
return GetResponse <T>();
}
void CoreService::Start ()
{
InputPipe.reset (new Pipe());
OutputPipe.reset (new Pipe());
int pid = fork();
throw_sys_if (pid == -1);
if (pid == 0)
{
try
{
ProcessRequests();
_exit (0);
}
catch (...) { }
_exit (1);
}
ServiceInputStream = shared_ptr <Stream> (new FileStream (InputPipe->GetWriteFD()));
ServiceOutputStream = shared_ptr <Stream> (new FileStream (OutputPipe->GetReadFD()));
}
void CoreService::StartElevated (const CoreServiceRequest &request)
{
auto_ptr <Pipe> inPipe (new Pipe());
auto_ptr <Pipe> outPipe (new Pipe());
Pipe errPipe;
int forkedPid = fork();
throw_sys_if (forkedPid == -1);
if (forkedPid == 0)
{
try
{
try
{
throw_sys_if (dup2 (inPipe->GetReadFD(), STDIN_FILENO) == -1);
throw_sys_if (dup2 (outPipe->GetWriteFD(), STDOUT_FILENO) == -1);
throw_sys_if (dup2 (errPipe.GetWriteFD(), STDERR_FILENO) == -1);
string appPath = request.ApplicationExecutablePath;
if (appPath.empty())
appPath = "veracrypt";
const char *args[] = { "sudo", "-S", "-p", "", appPath.c_str(), TC_CORE_SERVICE_CMDLINE_OPTION, nullptr };
execvp (args[0], ((char* const*) args));
throw SystemException (SRC_POS, args[0]);
}
catch (Exception &)
{
throw;
}
catch (exception &e)
{
throw ExternalException (SRC_POS, StringConverter::ToExceptionString (e));
}
catch (...)
{
throw UnknownException (SRC_POS);
}
}
catch (Exception &e)
{
try
{
shared_ptr <Stream> outputStream (new FileStream (errPipe.GetWriteFD()));
e.Serialize (outputStream);
}
catch (...) { }
}
_exit (1);
}
vector <char> adminPassword (request.AdminPassword.size() + 1);
int timeout = 6000;
if (request.FastElevation)
{
string dummyPassword = "dummy\n";
adminPassword = vector <char> (dummyPassword.size());
Memory::Copy (&adminPassword.front(), dummyPassword.c_str(), dummyPassword.size());
timeout = 1000;
}
else
{
Memory::Copy (&adminPassword.front(), request.AdminPassword.c_str(), request.AdminPassword.size());
adminPassword[request.AdminPassword.size()] = '\n';
}
if (write (inPipe->GetWriteFD(), &adminPassword.front(), adminPassword.size())) { } // Errors ignored
Memory::Erase (&adminPassword.front(), adminPassword.size());
throw_sys_if (fcntl (outPipe->GetReadFD(), F_SETFL, O_NONBLOCK) == -1);
throw_sys_if (fcntl (errPipe.GetReadFD(), F_SETFL, O_NONBLOCK) == -1);
vector <char> buffer (4096), errOutput (4096);
buffer.clear ();
errOutput.clear ();
Poller poller (outPipe->GetReadFD(), errPipe.GetReadFD());
int status, waitRes;
int exitCode = 1;
try
{
do
{
ssize_t bytesRead = 0;
foreach (int fd, poller.WaitForData (timeout))
{
bytesRead = read (fd, &buffer[0], buffer.capacity());
if (bytesRead > 0 && fd == errPipe.GetReadFD())
{
errOutput.insert (errOutput.end(), buffer.begin(), buffer.begin() + bytesRead);
if (bytesRead > 5 && bytesRead < 80) // Short message captured
timeout = 200;
}
}
if (bytesRead == 0)
{
waitRes = waitpid (forkedPid, &status, 0);
break;
}
} while ((waitRes = waitpid (forkedPid, &status, WNOHANG)) == 0);
}
catch (TimeOut&)
{
if ((waitRes = waitpid (forkedPid, &status, WNOHANG)) == 0)
{
inPipe->Close();
outPipe->Close();
errPipe.Close();
if (request.FastElevation)
{
// Prevent defunct process
struct WaitFunctor : public Functor
{
WaitFunctor (int pid) : Pid (pid) { }
virtual void operator() ()
{
int status;
for (int t = 0; t < 10 && waitpid (Pid, &status, WNOHANG) == 0; t++)
Thread::Sleep (1000);
}
int Pid;
};
Thread thread;
thread.Start (new WaitFunctor (forkedPid));
throw ElevationFailed (SRC_POS, "sudo", 1, "");
}
waitRes = waitpid (forkedPid, &status, 0);
}
}
if (!errOutput.empty())
{
auto_ptr <Serializable> deserializedObject;
Exception *deserializedException = nullptr;
try
{
shared_ptr <Stream> stream (new MemoryStream (ConstBufferPtr ((byte *) &errOutput[0], errOutput.size())));
deserializedObject.reset (Serializable::DeserializeNew (stream));
deserializedException = dynamic_cast <Exception*> (deserializedObject.get());
}
catch (...) { }
if (deserializedException)
deserializedException->Throw();
}
throw_sys_if (waitRes == -1);
exitCode = (WIFEXITED (status) ? WEXITSTATUS (status) : 1);
if (exitCode != 0)
{
string strErrOutput;
if (!errOutput.empty())
strErrOutput.insert (strErrOutput.begin(), errOutput.begin(), errOutput.end());
// sudo may require a tty even if -S is used
if (strErrOutput.find (" tty") != string::npos)
strErrOutput += "\nTo enable use of 'sudo' by applications without a terminal window, please disable 'requiretty' option in '/etc/sudoers'. Newer versions of sudo automatically determine whether a terminal is required ('requiretty' option is obsolete).";
throw ElevationFailed (SRC_POS, "sudo", exitCode, strErrOutput);
}
throw_sys_if (fcntl (outPipe->GetReadFD(), F_SETFL, 0) == -1);
ServiceInputStream = shared_ptr <Stream> (new FileStream (inPipe->GetWriteFD()));
ServiceOutputStream = shared_ptr <Stream> (new FileStream (outPipe->GetReadFD()));
// Send sync code
byte sync[] = { 0, 0x11, 0x22 };
ServiceInputStream->Write (ConstBufferPtr (sync, array_capacity (sync)));
AdminInputPipe = inPipe;
AdminOutputPipe = outPipe;
}
void CoreService::Stop ()
{
ExitRequest exitRequest;
exitRequest.Serialize (ServiceInputStream);
}
shared_ptr <GetStringFunctor> CoreService::AdminPasswordCallback;
auto_ptr <Pipe> CoreService::AdminInputPipe;
auto_ptr <Pipe> CoreService::AdminOutputPipe;
auto_ptr <Pipe> CoreService::InputPipe;
auto_ptr <Pipe> CoreService::OutputPipe;
shared_ptr <Stream> CoreService::ServiceInputStream;
shared_ptr <Stream> CoreService::ServiceOutputStream;
bool CoreService::ElevatedPrivileges = false;
bool CoreService::ElevatedServiceAvailable = false;
}
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