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launcher.c
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launcher.c
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/**
* @file launcher/launcher.c
*
* @copyright 2018-2020 Bill Zissimopoulos
*/
/*
* This file is part of WinSpd.
*
* You can redistribute it and/or modify it under the terms of the GNU
* General Public License version 3 as published by the Free Software
* Foundation.
*
* Licensees holding a valid commercial license may use this software
* in accordance with the commercial license agreement provided in
* conjunction with the software. The terms and conditions of any such
* commercial license agreement shall govern, supersede, and render
* ineffective any application of the GPLv3 license to this software,
* notwithstanding of any reference thereto in the software or
* associated repository.
*/
#include <shared/shared.h>
#include <aclapi.h>
#include <sddl.h>
#define PROGNAME "WinSpd.Launcher"
#define LAUNCHER_PIPE_DEFAULT_TIMEOUT 15000
#define LAUNCHER_START_TIMEOUT 30000
#define LAUNCHER_STOP_TIMEOUT 30000
#define LAUNCHER_KILL_TIMEOUT 5000
typedef struct
{
LONG RefCount;
PWSTR ClassName;
PWSTR InstanceName;
PWSTR CommandLine;
PSECURITY_DESCRIPTOR SecurityDescriptor;
BOOLEAN Persistent;
DWORD ProcessId;
HANDLE Process;
HANDLE ProcessWait;
HANDLE VolumeHandles;
ULONG VolumeHandleCount;
LIST_ENTRY ListEntry;
WCHAR Buffer[];
} SVC_INSTANCE;
typedef struct
{
HANDLE Process;
HANDLE ProcessWait;
} KILL_PROCESS_DATA;
static CRITICAL_SECTION SvcInstanceLock;
static HANDLE SvcInstanceEvent;
static LIST_ENTRY SvcInstanceList = { &SvcInstanceList, &SvcInstanceList };
/*
* The OS will cleanup for us. So there is no need to explicitly release these resources.
*
* This also protects us from various races that we do not have to solve.
*/
static SERVICE_STATUS_HANDLE SvcHandle;
static HANDLE SvcJob, SvcThread, SvcEvent;
static DWORD SvcThreadId;
static HANDLE SvcPipe = INVALID_HANDLE_VALUE;
static OVERLAPPED SvcOverlapped;
static VOID CALLBACK KillProcessWait(PVOID Context, BOOLEAN Timeout);
static VOID CALLBACK SvcInstanceTerminated(PVOID Context, BOOLEAN Timeout);
static VOID KillProcess(ULONG ProcessId, HANDLE Process, ULONG Timeout)
{
if (GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, ProcessId))
{
/*
* If GenerateConsoleCtrlEvent succeeds, but the child process does not exit
* timely we will terminate it with extreme prejudice. This is done by calling
* RegisterWaitForSingleObject with timeout on a duplicated process handle.
*
* If GenerateConsoleCtrlEvent succeeds, but we are not able to successfully call
* RegisterWaitForSingleObject, we do NOT terminate the child process forcibly.
* This is by design as it is not the child process's fault and the child process
* should (we hope in this case) respond to the console control event timely.
*/
KILL_PROCESS_DATA *KillProcessData;
KillProcessData = MemAlloc(sizeof *KillProcessData);
if (0 != KillProcessData)
{
if (DuplicateHandle(GetCurrentProcess(), Process, GetCurrentProcess(), &KillProcessData->Process,
0, FALSE, DUPLICATE_SAME_ACCESS))
{
if (RegisterWaitForSingleObject(&KillProcessData->ProcessWait, KillProcessData->Process,
KillProcessWait, KillProcessData, Timeout, WT_EXECUTEONLYONCE))
KillProcessData = 0;
else
CloseHandle(KillProcessData->Process);
}
MemFree(KillProcessData);
}
}
else
TerminateProcess(Process, 0);
}
static VOID CALLBACK KillProcessWait(PVOID Context, BOOLEAN Timeout)
{
KILL_PROCESS_DATA *KillProcessData = Context;
if (Timeout)
TerminateProcess(KillProcessData->Process, 0);
UnregisterWaitEx(KillProcessData->ProcessWait, 0);
CloseHandle(KillProcessData->Process);
MemFree(KillProcessData);
}
static DWORD GetVolumeOwnerProcessId(PWSTR Volume, PDWORD PProcessId)
{
HANDLE Handle = INVALID_HANDLE_VALUE;
STORAGE_PROPERTY_QUERY Query;
DWORD BytesTransferred;
union
{
STORAGE_DEVICE_DESCRIPTOR Device;
STORAGE_DEVICE_ID_DESCRIPTOR DeviceId;
UINT8 B[1024];
} DescBuf;
PSTORAGE_IDENTIFIER Identifier;
DWORD ProcessId;
DWORD Error;
*PProcessId = 0;
Handle = CreateFileW(Volume, 0, 0, 0, OPEN_EXISTING, 0, 0);
if (INVALID_HANDLE_VALUE == Handle)
{
Error = GetLastError();
goto exit;
}
Query.PropertyId = StorageDeviceProperty;
Query.QueryType = PropertyStandardQuery;
Query.AdditionalParameters[0] = 0;
memset(&DescBuf, 0, sizeof DescBuf);
if (!DeviceIoControl(Handle, IOCTL_STORAGE_QUERY_PROPERTY,
&Query, sizeof Query, &DescBuf, sizeof DescBuf,
&BytesTransferred, 0))
{
Error = GetLastError();
goto exit;
}
Error = ERROR_NO_ASSOCIATION;
if (sizeof DescBuf >= DescBuf.Device.Size && 0 != DescBuf.Device.VendorIdOffset)
if (0 == invariant_strcmp((const char *)((PUINT8)&DescBuf + DescBuf.Device.VendorIdOffset),
SPD_IOCTL_VENDOR_ID))
Error = ERROR_SUCCESS;
if (ERROR_SUCCESS != Error)
goto exit;
Query.PropertyId = StorageDeviceIdProperty;
Query.QueryType = PropertyStandardQuery;
Query.AdditionalParameters[0] = 0;
memset(&DescBuf, 0, sizeof DescBuf);
if (!DeviceIoControl(Handle, IOCTL_STORAGE_QUERY_PROPERTY,
&Query, sizeof Query, &DescBuf, sizeof DescBuf,
&BytesTransferred, 0))
{
Error = GetLastError();
goto exit;
}
Error = ERROR_NO_ASSOCIATION;
if (sizeof DescBuf >= DescBuf.DeviceId.Size)
{
Identifier = (PSTORAGE_IDENTIFIER)DescBuf.DeviceId.Identifiers;
for (ULONG I = 0; DescBuf.DeviceId.NumberOfIdentifiers > I; I++)
{
if (StorageIdCodeSetBinary == Identifier->CodeSet &&
StorageIdTypeVendorSpecific == Identifier->Type &&
StorageIdAssocDevice == Identifier->Association &&
8 == Identifier->IdentifierSize &&
'P' == Identifier->Identifier[0] &&
'I' == Identifier->Identifier[1] &&
'D' == Identifier->Identifier[2] &&
/* allow volumes that have EjectDisabled in the launcher */
(' ' == Identifier->Identifier[3] || 'X' == Identifier->Identifier[3]))
{
ProcessId =
(Identifier->Identifier[4] << 24) |
(Identifier->Identifier[5] << 16) |
(Identifier->Identifier[6] << 8) |
(Identifier->Identifier[7]);
Error = ERROR_SUCCESS;
break;
}
Identifier = (PSTORAGE_IDENTIFIER)((PUINT8)Identifier + Identifier->NextOffset);
}
}
if (ERROR_SUCCESS != Error)
goto exit;
*PProcessId = ProcessId;
exit:
if (INVALID_HANDLE_VALUE != Handle)
CloseHandle(Handle);
return Error;
}
static DWORD OpenAndDismountVolume(PWSTR Volume, PHANDLE PHandle)
{
HANDLE Handle = INVALID_HANDLE_VALUE;
DWORD BytesTransferred;
DWORD Error;
*PHandle = INVALID_HANDLE_VALUE;
Handle = CreateFileW(
Volume,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
0,
OPEN_EXISTING,
0,
0);
if (INVALID_HANDLE_VALUE == Handle)
{
Error = GetLastError();
goto exit;
}
/* lock and dismount; unlock happens at CloseHandle */
if (!DeviceIoControl(Handle, FSCTL_LOCK_VOLUME, 0, 0, 0, 0, &BytesTransferred, 0) ||
!DeviceIoControl(Handle, FSCTL_DISMOUNT_VOLUME, 0, 0, 0, 0, &BytesTransferred, 0))
{
Error = GetLastError();
if (ERROR_ACCESS_DENIED == Error)
Error = ERROR_DEVICE_IN_USE;
CloseHandle(Handle);
goto exit;
}
*PHandle = Handle;
Error = ERROR_SUCCESS;
exit:
return Error;
}
static VOID CloseHandles(PHANDLE Handles, ULONG Count)
{
for (ULONG Index = 0; Count > Index; Index++)
CloseHandle(Handles[Index]);
}
static DWORD OpenAndDismountVolumesForProcessId(DWORD ProcessId, PHANDLE Handles, PULONG PCount)
{
HANDLE FindHandle = INVALID_HANDLE_VALUE;
WCHAR Volume[MAX_PATH];
DWORD OwnerProcessId;
ULONG Index = 0, Count = *PCount;
DWORD Error, DevicesInUse = 0;
*PCount = 0;
FindHandle = FindFirstVolumeW(Volume, MAX_PATH);
if (INVALID_HANDLE_VALUE == FindHandle)
{
Error = GetLastError();
goto exit;
}
do
{
if (Count <= Index)
break;
PWSTR EndP = Volume + lstrlenW(Volume);
if (Volume < EndP && L'\\' == EndP[-1])
EndP[-1] = L'\0';
Error = GetVolumeOwnerProcessId(Volume, &OwnerProcessId);
if (ERROR_SUCCESS != Error || ProcessId != OwnerProcessId)
continue;
Error = OpenAndDismountVolume(Volume, &Handles[Index]);
if (ERROR_SUCCESS == Error)
Index++;
else
if (ERROR_DEVICE_IN_USE == Error)
DevicesInUse++;
} while (FindNextVolumeW(FindHandle, Volume, MAX_PATH));
/* treat only non-zero DevicesInUse as error */
Error = 0 == DevicesInUse ? ERROR_SUCCESS : ERROR_DEVICE_IN_USE;
*PCount = Index;
exit:
if (ERROR_SUCCESS != Error)
CloseHandles(Handles, Index);
if (INVALID_HANDLE_VALUE != FindHandle)
FindVolumeClose(FindHandle);
return Error;
}
static SVC_INSTANCE *SvcInstanceLookupByPid(DWORD ProcessId)
{
SVC_INSTANCE *SvcInstance;
PLIST_ENTRY ListEntry;
for (ListEntry = SvcInstanceList.Flink;
&SvcInstanceList != ListEntry;
ListEntry = ListEntry->Flink)
{
SvcInstance = CONTAINING_RECORD(ListEntry, SVC_INSTANCE, ListEntry);
if (ProcessId == SvcInstance->ProcessId)
return SvcInstance;
}
return 0;
}
static SVC_INSTANCE *SvcInstanceLookup(PWSTR ClassName, PWSTR InstanceName,
BOOLEAN AllowPidLookup)
{
if (AllowPidLookup && 0 == invariant_wcsicmp(ClassName, L".pid."))
{
PWSTR Endp;
DWORD ProcessId;
ProcessId = (DWORD)wcstoint(InstanceName, 0, 0, &Endp);
return SvcInstanceLookupByPid(ProcessId);
}
SVC_INSTANCE *SvcInstance;
PLIST_ENTRY ListEntry;
for (ListEntry = SvcInstanceList.Flink;
&SvcInstanceList != ListEntry;
ListEntry = ListEntry->Flink)
{
SvcInstance = CONTAINING_RECORD(ListEntry, SVC_INSTANCE, ListEntry);
if (0 == invariant_wcsicmp(ClassName, SvcInstance->ClassName) &&
0 == invariant_wcsicmp(InstanceName, SvcInstance->InstanceName))
return SvcInstance;
}
return 0;
}
static BOOLEAN SvcInstanceSetPersistent(
PWSTR ClassName, PWSTR InstanceName, ULONG Argc, PWSTR *Argv,
PSECURITY_DESCRIPTOR SecurityDescriptor)
{
HKEY RegKey = 0, ClassRegKey = 0;
DWORD RegSize, Persistent, ArgSize;
PWSTR Security = 0;
PWSTR ArgBuf = 0, ArgP;
DWORD Error;
BOOLEAN Result = FALSE;
Error = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"" SPD_LAUNCH_REGKEY,
0, SPD_LAUNCH_REGKEY_WOW64 | KEY_READ, &RegKey);
if (ERROR_SUCCESS != Error)
goto exit;
RegSize = sizeof Persistent;
Error = RegGetValueW(RegKey, ClassName, L"Persistent", RRF_RT_REG_DWORD, 0,
&Persistent, &RegSize);
if (ERROR_SUCCESS != Error)
goto exit;
if (!Persistent)
goto exit;
if (!ConvertSecurityDescriptorToStringSecurityDescriptorW(SecurityDescriptor,
SDDL_REVISION_1,
OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
&Security, 0))
{
Error = GetLastError();
goto exit;
}
ArgSize = 1;
for (ULONG I = 0; Argc > I; I++)
ArgSize += lstrlenW(Argv[I]) + 1;
ArgSize += lstrlenW(Security) + 1;
ArgSize *= sizeof(WCHAR);
ArgBuf = MemAlloc(ArgSize);
if (0 == ArgBuf)
{
Error = ERROR_NO_SYSTEM_RESOURCES;
goto exit;
}
ArgP = ArgBuf;
for (ULONG I = 0; Argc > I; I++)
{
ArgSize = lstrlen(Argv[I]) + 1;
memcpy(ArgP, Argv[I], ArgSize * sizeof(WCHAR));
ArgP += ArgSize;
}
ArgSize = lstrlen(Security) + 1;
memcpy(ArgP, Security, ArgSize * sizeof(WCHAR));
ArgP += ArgSize;
*ArgP++ = L'\0';
Error = RegOpenKeyExW(RegKey, ClassName,
0, SPD_LAUNCH_REGKEY_WOW64 | KEY_ALL_ACCESS, &ClassRegKey);
if (ERROR_SUCCESS != Error)
goto exit;
Error = RegSetKeyValueW(ClassRegKey, L"Instances", InstanceName,
REG_MULTI_SZ, ArgBuf, (DWORD)((PUINT8)ArgP - (PUINT8)ArgBuf));
if (ERROR_SUCCESS != Error)
goto exit;
Result = TRUE;
exit:
MemFree(ArgBuf);
LocalFree(Security);
if (0 != ClassRegKey)
RegCloseKey(ClassRegKey);
if (0 != RegKey)
RegCloseKey(RegKey);
return Result;
}
static VOID SvcInstanceDeletePersistent(
PWSTR ClassName, PWSTR InstanceName)
{
HKEY RegKey = 0, ClassRegKey = 0;
DWORD Error;
Error = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"" SPD_LAUNCH_REGKEY,
0, SPD_LAUNCH_REGKEY_WOW64 | KEY_READ, &RegKey);
if (ERROR_SUCCESS != Error)
goto exit;
Error = RegOpenKeyExW(RegKey, ClassName,
0, SPD_LAUNCH_REGKEY_WOW64 | KEY_ALL_ACCESS, &ClassRegKey);
if (ERROR_SUCCESS != Error)
goto exit;
Error = RegDeleteKeyValueW(ClassRegKey, L"Instances", InstanceName);
if (ERROR_SUCCESS != Error)
goto exit;
Error = ERROR_SUCCESS;
exit:
if (0 != ClassRegKey)
RegCloseKey(ClassRegKey);
if (0 != RegKey)
RegCloseKey(RegKey);
}
__declspec(noinline) /* noinline resolves "unresolved external symbol __chkstk" on Release builds */
static DWORD SvcInstanceAddUserRights(HANDLE Token,
PSECURITY_DESCRIPTOR SecurityDescriptor, PSECURITY_DESCRIPTOR *PNewSecurityDescriptor)
{
PSECURITY_DESCRIPTOR NewSecurityDescriptor;
TOKEN_USER *User = 0;
EXPLICIT_ACCESSW AccessEntry;
DWORD Size, Error;
*PNewSecurityDescriptor = 0;
if (GetTokenInformation(Token, TokenUser, 0, 0, &Size))
{
Error = ERROR_INVALID_PARAMETER;
goto exit;
}
if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
{
Error = GetLastError();
goto exit;
}
User = MemAlloc(Size);
if (0 == User)
{
Error = ERROR_NO_SYSTEM_RESOURCES;
goto exit;
}
if (!GetTokenInformation(Token, TokenUser, User, Size, &Size))
{
Error = GetLastError();
goto exit;
}
AccessEntry.grfAccessPermissions = SERVICE_QUERY_STATUS | SERVICE_STOP;
AccessEntry.grfAccessMode = GRANT_ACCESS;
AccessEntry.grfInheritance = NO_INHERITANCE;
AccessEntry.Trustee.pMultipleTrustee = 0;
AccessEntry.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
AccessEntry.Trustee.TrusteeForm = TRUSTEE_IS_SID;
AccessEntry.Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
AccessEntry.Trustee.ptstrName = User->User.Sid;
Error = BuildSecurityDescriptorW(0, 0, 1, &AccessEntry, 0, 0, SecurityDescriptor,
&Size, &NewSecurityDescriptor);
if (ERROR_SUCCESS != Error)
goto exit;
*PNewSecurityDescriptor = NewSecurityDescriptor;
Error = ERROR_SUCCESS;
exit:
MemFree(User);
return Error;
}
static DWORD SvcInstanceAccessCheck(HANDLE ClientToken, ULONG DesiredAccess,
PSECURITY_DESCRIPTOR SecurityDescriptor)
{
static GENERIC_MAPPING GenericMapping =
{
.GenericRead = STANDARD_RIGHTS_READ | SERVICE_QUERY_CONFIG | SERVICE_QUERY_STATUS |
SERVICE_INTERROGATE | SERVICE_ENUMERATE_DEPENDENTS,
.GenericWrite = STANDARD_RIGHTS_WRITE | SERVICE_CHANGE_CONFIG,
.GenericExecute = STANDARD_RIGHTS_EXECUTE | SERVICE_START | SERVICE_STOP |
SERVICE_PAUSE_CONTINUE | SERVICE_USER_DEFINED_CONTROL,
.GenericAll = SERVICE_ALL_ACCESS,
};
UINT8 PrivilegeSetBuf[sizeof(PRIVILEGE_SET) + 15 * sizeof(LUID_AND_ATTRIBUTES)];
PPRIVILEGE_SET PrivilegeSet = (PVOID)PrivilegeSetBuf;
DWORD PrivilegeSetLength = sizeof PrivilegeSetBuf;
ULONG GrantedAccess;
BOOL AccessStatus;
DWORD Error;
if (AccessCheck(SecurityDescriptor, ClientToken, DesiredAccess,
&GenericMapping, PrivilegeSet, &PrivilegeSetLength, &GrantedAccess, &AccessStatus))
Error = AccessStatus ? ERROR_SUCCESS : ERROR_ACCESS_DENIED;
else
Error = GetLastError();
return Error;
}
static ULONG SvcInstanceArgumentLength(PWSTR Arg)
{
ULONG Length;
Length = 2; /* for beginning and ending quotes */
for (PWSTR P = Arg; *P; P++)
if (L'"' != *P)
Length++;
return Length;
}
static PWSTR SvcInstanceArgumentCopy(PWSTR Dest, PWSTR Arg)
{
*Dest++ = L'"';
for (PWSTR P = Arg; *P; P++)
if (L'"' != *P)
*Dest++ = *P;
*Dest++ = L'"';
return Dest;
}
static DWORD SvcInstanceReplaceArguments(PWSTR String, ULONG Argc, PWSTR *Argv,
PWSTR *PNewString)
{
PWSTR NewString = 0, P, Q;
PWSTR EmptyArg = L"";
ULONG Length;
*PNewString = 0;
Length = 0;
for (P = String; *P; P++)
{
switch (*P)
{
case L'%':
P++;
if (L'0' <= *P && *P <= '9')
{
if (Argc > (ULONG)(*P - L'0'))
Length += SvcInstanceArgumentLength(Argv[*P - L'0']);
else
Length += SvcInstanceArgumentLength(EmptyArg);
}
else
Length++;
break;
default:
Length++;
break;
}
}
NewString = MemAlloc((Length + 1) * sizeof(WCHAR));
if (0 == NewString)
return ERROR_NO_SYSTEM_RESOURCES;
for (P = String, Q = NewString; *P; P++)
{
switch (*P)
{
case L'%':
P++;
if (L'0' <= *P && *P <= '9')
{
if (Argc > (ULONG)(*P - L'0'))
Q = SvcInstanceArgumentCopy(Q, Argv[*P - L'0']);
else
Q = SvcInstanceArgumentCopy(Q, EmptyArg);
}
else
*Q++ = *P;
break;
default:
*Q++ = *P;
break;
}
}
*Q = L'\0';
*PNewString = NewString;
return ERROR_SUCCESS;
}
static DWORD SvcInstanceCreateProcess(
PWSTR Executable, PWSTR CommandLine, PWSTR WorkDirectory,
PPROCESS_INFORMATION ProcessInfo)
{
WCHAR WorkDirectoryBuf[MAX_PATH];
STARTUPINFOW StartupInfo;
if (0 != WorkDirectory && L'.' == WorkDirectory[0] && L'\0' == WorkDirectory[1])
{
PWSTR Backslash = 0, P;
if (0 == GetModuleFileNameW(0, WorkDirectoryBuf, MAX_PATH))
return GetLastError();
for (P = WorkDirectoryBuf; *P; P++)
if (L'\\' == *P)
Backslash = P;
if (0 != Backslash && WorkDirectoryBuf < Backslash && L':' != Backslash[-1])
*Backslash = L'\0';
WorkDirectory = WorkDirectoryBuf;
}
memset(&StartupInfo, 0, sizeof StartupInfo);
StartupInfo.cb = sizeof StartupInfo;
if (!CreateProcessW(
Executable, CommandLine, 0, 0, FALSE,
CREATE_SUSPENDED | CREATE_NEW_PROCESS_GROUP,
0, WorkDirectory,
&StartupInfo, ProcessInfo))
return GetLastError();
return ERROR_SUCCESS;
}
static DWORD SvcInstanceCreate(HANDLE ClientToken, PWSTR ExternalSecurity,
PWSTR ClassName, PWSTR InstanceName, ULONG Argc, PWSTR *Argv0, HANDLE Job,
SVC_INSTANCE **PSvcInstance)
{
SVC_INSTANCE *SvcInstance = 0;
HKEY RegKey = 0;
DWORD RegSize;
DWORD ClassNameSize, InstanceNameSize;
WCHAR Executable[MAX_PATH], CommandLineBuf[512], WorkDirectory[MAX_PATH],
SecurityBuf[512];
PWSTR CommandLine, Security;
DWORD JobControl;
PSECURITY_DESCRIPTOR SecurityDescriptor = 0, NewSecurityDescriptor;
PWSTR Argv[10];
PROCESS_INFORMATION ProcessInfo;
DWORD Error;
*PSvcInstance = 0;
lstrcpyW(CommandLineBuf, L"%0 ");
lstrcpyW(SecurityBuf, L"O:SYG:SY");
if (Argc > sizeof Argv / sizeof Argv[0] - 1)
Argc = sizeof Argv / sizeof Argv[0] - 1;
memcpy(Argv + 1, Argv0, Argc * sizeof(PWSTR));
Argv[0] = 0;
Argc++;
memset(&ProcessInfo, 0, sizeof ProcessInfo);
EnterCriticalSection(&SvcInstanceLock);
if (0 == invariant_wcsicmp(ClassName, L".pid."))
{
Error = ERROR_INVALID_PARAMETER;
goto exit;
}
if (0 != SvcInstanceLookup(ClassName, InstanceName, FALSE))
{
Error = ERROR_ALREADY_EXISTS;
goto exit;
}
Error = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"" SPD_LAUNCH_REGKEY,
0, SPD_LAUNCH_REGKEY_WOW64 | KEY_READ, &RegKey);
if (ERROR_SUCCESS != Error)
goto exit;
RegSize = sizeof Executable;
Executable[0] = L'\0';
Error = RegGetValueW(RegKey, ClassName, L"Executable", RRF_RT_REG_SZ, 0,
Executable, &RegSize);
if (ERROR_SUCCESS != Error)
goto exit;
Argv[0] = Executable;
CommandLine = CommandLineBuf + lstrlenW(CommandLineBuf);
RegSize = (DWORD)(sizeof CommandLineBuf - (CommandLine - CommandLineBuf) * sizeof(WCHAR));
Error = RegGetValueW(RegKey, ClassName, L"CommandLine", RRF_RT_REG_SZ, 0,
CommandLine, &RegSize);
if (ERROR_SUCCESS != Error && ERROR_FILE_NOT_FOUND != Error)
goto exit;
if (ERROR_FILE_NOT_FOUND == Error)
CommandLine[-1] = L'\0';
CommandLine = CommandLineBuf;
RegSize = sizeof WorkDirectory;
WorkDirectory[0] = L'\0';
Error = RegGetValueW(RegKey, ClassName, L"WorkDirectory", RRF_RT_REG_SZ, 0,
WorkDirectory, &RegSize);
if (ERROR_SUCCESS != Error && ERROR_FILE_NOT_FOUND != Error)
goto exit;
Security = SecurityBuf + lstrlenW(SecurityBuf);
RegSize = (DWORD)(sizeof SecurityBuf - (Security - SecurityBuf) * sizeof(WCHAR));
Error = RegGetValueW(RegKey, ClassName, L"Security", RRF_RT_REG_SZ, 0,
Security, &RegSize);
if (ERROR_SUCCESS != Error && ERROR_FILE_NOT_FOUND != Error)
goto exit;
RegSize = sizeof JobControl;
JobControl = 1; /* default is YES! */
Error = RegGetValueW(RegKey, ClassName, L"JobControl", RRF_RT_REG_DWORD, 0,
&JobControl, &RegSize);
if (ERROR_SUCCESS != Error && ERROR_FILE_NOT_FOUND != Error)
goto exit;
RegCloseKey(RegKey);
RegKey = 0;
if (L'\0' == Security[0])
lstrcpyW(Security, L"" SPD_LAUNCH_SERVICE_DEFAULT_SDDL);
if (L'D' == Security[0] && L':' == Security[1])
Security = SecurityBuf;
if (!ConvertStringSecurityDescriptorToSecurityDescriptorW(
0 != ExternalSecurity ? ExternalSecurity : Security,
SDDL_REVISION_1, &SecurityDescriptor, 0))
{
Error = GetLastError();
goto exit;
}
if (0 != ClientToken)
{
Error = SvcInstanceAccessCheck(ClientToken, SERVICE_START, SecurityDescriptor);
if (ERROR_SUCCESS != Error)
goto exit;
Error = SvcInstanceAddUserRights(ClientToken, SecurityDescriptor, &NewSecurityDescriptor);
if (ERROR_SUCCESS != Error)
goto exit;
LocalFree(SecurityDescriptor);
SecurityDescriptor = NewSecurityDescriptor;
}
ClassNameSize = (lstrlenW(ClassName) + 1) * sizeof(WCHAR);
InstanceNameSize = (lstrlenW(InstanceName) + 1) * sizeof(WCHAR);
SvcInstance = MemAlloc(sizeof *SvcInstance + ClassNameSize + InstanceNameSize);
if (0 == SvcInstance)
{
Error = ERROR_NO_SYSTEM_RESOURCES;
goto exit;
}
memset(SvcInstance, 0, sizeof *SvcInstance);
SvcInstance->RefCount = 2;
memcpy(SvcInstance->Buffer, ClassName, ClassNameSize);
memcpy(SvcInstance->Buffer + ClassNameSize / sizeof(WCHAR), InstanceName, InstanceNameSize);
SvcInstance->ClassName = SvcInstance->Buffer;
SvcInstance->InstanceName = SvcInstance->Buffer + ClassNameSize / sizeof(WCHAR);
SvcInstance->SecurityDescriptor = SecurityDescriptor;
Error = SvcInstanceReplaceArguments(CommandLine, Argc, Argv, &SvcInstance->CommandLine);
if (ERROR_SUCCESS != Error)
goto exit;
Error = SvcInstanceCreateProcess(
Executable, SvcInstance->CommandLine, L'\0' != WorkDirectory[0] ? WorkDirectory : 0,
&ProcessInfo);
if (ERROR_SUCCESS != Error)
goto exit;
SvcInstance->ProcessId = ProcessInfo.dwProcessId;
SvcInstance->Process = ProcessInfo.hProcess;
if (!RegisterWaitForSingleObject(&SvcInstance->ProcessWait, SvcInstance->Process,
SvcInstanceTerminated, SvcInstance, INFINITE, WT_EXECUTEONLYONCE))
{
Error = GetLastError();
goto exit;
}
if (0 != Job && JobControl)
{
if (!AssignProcessToJobObject(Job, SvcInstance->Process))
SpdServiceLog(EVENTLOG_WARNING_TYPE,
L"Ignorning error: AssignProcessToJobObject = %ld", GetLastError());
}
/*
* ONCE THE PROCESS IS RESUMED NO MORE FAILURES ALLOWED!
*/
ResumeThread(ProcessInfo.hThread);
CloseHandle(ProcessInfo.hThread);
ProcessInfo.hThread = 0;
InsertTailList(&SvcInstanceList, &SvcInstance->ListEntry);
ResetEvent(SvcInstanceEvent);
*PSvcInstance = SvcInstance;
Error = ERROR_SUCCESS;
exit:
if (ERROR_SUCCESS != Error)
{
LocalFree(SecurityDescriptor);
if (0 != ProcessInfo.hThread)
CloseHandle(ProcessInfo.hThread);
if (0 != SvcInstance)
{
if (0 != SvcInstance->ProcessWait)
UnregisterWaitEx(SvcInstance->ProcessWait, 0);
if (0 != SvcInstance->Process)
{
TerminateProcess(SvcInstance->Process, 0);
CloseHandle(SvcInstance->Process);
}
MemFree(SvcInstance->CommandLine);
MemFree(SvcInstance);
}
}
if (0 != RegKey)
RegCloseKey(RegKey);
LeaveCriticalSection(&SvcInstanceLock);
SpdServiceLog(EVENTLOG_INFORMATION_TYPE,
L"create %s %s = %ld", ClassName, InstanceName, Error);
return Error;
}
static VOID SvcInstanceRelease(SVC_INSTANCE *SvcInstance)
{
if (0 != InterlockedDecrement(&SvcInstance->RefCount))
return;
EnterCriticalSection(&SvcInstanceLock);
if (RemoveEntryList(&SvcInstance->ListEntry))
SetEvent(SvcInstanceEvent);
LeaveCriticalSection(&SvcInstanceLock);
if (0 != SvcInstance->VolumeHandles)
{
CloseHandles(SvcInstance->VolumeHandles, SvcInstance->VolumeHandleCount);
MemFree(SvcInstance->VolumeHandles);
}
if (0 != SvcInstance->ProcessWait)
UnregisterWaitEx(SvcInstance->ProcessWait, 0);
if (0 != SvcInstance->Process)
CloseHandle(SvcInstance->Process);
LocalFree(SvcInstance->SecurityDescriptor);
MemFree(SvcInstance->CommandLine);
MemFree(SvcInstance);
}
static VOID CALLBACK SvcInstanceTerminated(PVOID Context, BOOLEAN Timeout)
{
SVC_INSTANCE *SvcInstance = Context;
SpdServiceLog(EVENTLOG_INFORMATION_TYPE,
L"terminated %s %s", SvcInstance->ClassName, SvcInstance->InstanceName);
SvcInstanceRelease(SvcInstance);
}
static DWORD SvcInstanceKill(SVC_INSTANCE *SvcInstance, BOOLEAN Forced)
{
HANDLE Handles[256];
ULONG Count;
DWORD Error;
if (0 == SvcInstance->VolumeHandles)
{
Count = sizeof Handles / sizeof Handles[0];
Error = OpenAndDismountVolumesForProcessId(SvcInstance->ProcessId, Handles, &Count);
if (ERROR_SUCCESS == Error && 0 < Count)
{
SvcInstance->VolumeHandles = MemAlloc(Count * sizeof(HANDLE));
if (0 != SvcInstance->VolumeHandles)
{
memcpy(SvcInstance->VolumeHandles, Handles, Count * sizeof(HANDLE));
SvcInstance->VolumeHandleCount = Count;
Count = 0;
}
}
}
else
{
/* if we already have volume handles we are not going to try dismounting again! */
Count = 0;
Error = ERROR_SUCCESS;
}
if (ERROR_SUCCESS == Error || Forced)
KillProcess(SvcInstance->ProcessId, SvcInstance->Process, LAUNCHER_KILL_TIMEOUT);
CloseHandles(Handles, Count);
return Error;
}
static DWORD SvcInstanceStart(HANDLE ClientToken,
PWSTR ClassName, PWSTR InstanceName, ULONG Argc, PWSTR *Argv, HANDLE Job)
{
SVC_INSTANCE *SvcInstance;
DWORD Error;
Error = SvcInstanceCreate(ClientToken, 0, ClassName, InstanceName, Argc, Argv, Job,
&SvcInstance);
if (ERROR_SUCCESS != Error)
return Error;
SvcInstance->Persistent = SvcInstanceSetPersistent(
SvcInstance->ClassName, SvcInstance->InstanceName, Argc, Argv,
SvcInstance->SecurityDescriptor);
SvcInstanceRelease(SvcInstance);
return ERROR_SUCCESS;
}
static DWORD SvcInstanceStop(HANDLE ClientToken,
PWSTR ClassName, PWSTR InstanceName, BOOLEAN Forced)