mirror of
https://github.com/winfsp/winfsp.git
synced 2025-04-22 08:23:05 -05:00
launcher: can now perform DefineDosDevice in LocalSystem context
dll: uses launcher to DefineDosDevice for LocalService, etc.
This commit is contained in:
Bill Zissimopoulos
parent
5d3b37122c
commit
ff155694ce
@ -1675,6 +1675,19 @@ FSP_API VOID FspServiceStop(FSP_SERVICE *Service);
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* TRUE if the process is running in running user interactive mode.
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*/
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FSP_API BOOLEAN FspServiceIsInteractive(VOID);
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/**
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* Check if the supplied token is from the service context.
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*
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* @param Token
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* Token to check. Pass NULL to check the current process token.
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* @param PIsLocalSystem
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* Pointer to a boolean that will receive a TRUE value if the token belongs to LocalSystem
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* and FALSE otherwise. May be NULL.
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* @return
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* STATUS_SUCCESS if the token is from the service context. STATUS_ACCESS_DENIED if it is not.
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* Other error codes are possible.
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*/
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FSP_API NTSTATUS FspServiceContextCheck(HANDLE Token, PBOOLEAN PIsLocalSystem);
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/**
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* Log a service message.
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*
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112
src/dll/fs.c
112
src/dll/fs.c
@ -16,6 +16,7 @@
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*/
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#include <dll/library.h>
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#include <launcher/launcher.h>
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enum
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{
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@ -187,17 +188,101 @@ FSP_API VOID FspFileSystemDelete(FSP_FILE_SYSTEM *FileSystem)
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MemFree(FileSystem);
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}
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static NTSTATUS FspFileSystemLauncherDefineDosDevice(
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WCHAR Sign, PWSTR MountPoint, PWSTR VolumeName)
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{
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NTSTATUS Result;
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ULONG MountPointLen, VolumeNameLen;
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PWSTR PipeBuf = 0, P;
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DWORD BytesTransferred;
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MountPointLen = lstrlenW(MountPoint);
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VolumeNameLen = lstrlenW(VolumeName);
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if (2 != MountPointLen ||
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FSP_FSCTL_VOLUME_NAME_SIZEMAX / sizeof(WCHAR) <= VolumeNameLen)
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return STATUS_INVALID_PARAMETER;
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PipeBuf = MemAlloc(LAUNCHER_PIPE_BUFFER_SIZE);
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if (0 == PipeBuf)
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{
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Result = STATUS_INSUFFICIENT_RESOURCES;
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goto exit;
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}
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P = PipeBuf;
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*P++ = LauncherDefineDosDevice;
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*P++ = Sign;
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memcpy(P, MountPoint, MountPointLen * sizeof(WCHAR)); P += MountPointLen; *P++ = L'\0';
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memcpy(P, VolumeName, VolumeNameLen * sizeof(WCHAR)); P += VolumeNameLen; *P++ = L'\0';
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Result = FspCallNamedPipeSecurely(L"" LAUNCHER_PIPE_NAME,
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PipeBuf, (ULONG)(P - PipeBuf) * sizeof(WCHAR), PipeBuf, LAUNCHER_PIPE_BUFFER_SIZE,
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&BytesTransferred, NMPWAIT_USE_DEFAULT_WAIT, LAUNCHER_PIPE_OWNER);
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if (!NT_SUCCESS(Result))
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goto exit;
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if (sizeof(WCHAR) > BytesTransferred)
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Result = RPC_NT_PROTOCOL_ERROR;
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else if (LauncherSuccess == PipeBuf[0])
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Result = STATUS_SUCCESS;
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else if (LauncherFailure == PipeBuf[0])
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{
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DWORD ErrorCode = 0;
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for (PWSTR P = PipeBuf + 1, EndP = PipeBuf + BytesTransferred / sizeof(WCHAR); EndP > P; P++)
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{
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if (L'0' > *P || *P > L'9')
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break;
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ErrorCode = 10 * ErrorCode + (*P - L'0');
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}
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Result = FspNtStatusFromWin32(ErrorCode);
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if (0 == Result)
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Result = RPC_NT_PROTOCOL_ERROR;
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}
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else
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Result = RPC_NT_PROTOCOL_ERROR;
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exit:
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MemFree(PipeBuf);
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return Result;
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}
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static NTSTATUS FspFileSystemSetMountPoint_Drive(PWSTR MountPoint, PWSTR VolumeName,
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PHANDLE PMountHandle)
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{
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NTSTATUS Result;
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BOOLEAN IsLocalSystem, IsServiceContext;
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*PMountHandle = 0;
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if (!DefineDosDeviceW(DDD_RAW_TARGET_PATH, MountPoint, VolumeName))
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return FspNtStatusFromWin32(GetLastError());
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Result = FspServiceContextCheck(0, &IsLocalSystem);
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IsServiceContext = NT_SUCCESS(Result) && !IsLocalSystem;
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if (IsServiceContext)
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{
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/*
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* If the current process is in the service context but not LocalSystem,
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* ask the launcher to DefineDosDevice for us. This is because the launcher
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* runs in the LocalSystem context and can create global drives.
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*
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* In this case the launcher will also add DELETE access to the drive symlink
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* for us, so that we can make it temporary below.
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*/
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Result = FspFileSystemLauncherDefineDosDevice(L'+', MountPoint, VolumeName);
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if (!NT_SUCCESS(Result))
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return Result;
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}
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else
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{
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if (!DefineDosDeviceW(DDD_RAW_TARGET_PATH, MountPoint, VolumeName))
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return FspNtStatusFromWin32(GetLastError());
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}
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if (0 != FspNtOpenSymbolicLinkObject)
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{
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NTSTATUS Result;
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WCHAR SymlinkBuf[6];
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UNICODE_STRING Symlink;
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OBJECT_ATTRIBUTES Obja;
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@ -224,6 +309,13 @@ static NTSTATUS FspFileSystemSetMountPoint_Drive(PWSTR MountPoint, PWSTR VolumeN
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}
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}
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/* HACK:
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*
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* Handles do not use the low 2 bits (unless they are console handles).
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* Abuse this fact to remember that we are running in the service context.
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*/
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*PMountHandle = (HANDLE)(UINT_PTR)((DWORD)(UINT_PTR)*PMountHandle | IsServiceContext);
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return STATUS_SUCCESS;
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}
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@ -411,8 +503,18 @@ exit:
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static VOID FspFileSystemRemoveMountPoint_Drive(PWSTR MountPoint, PWSTR VolumeName, HANDLE MountHandle)
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{
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DefineDosDeviceW(DDD_RAW_TARGET_PATH | DDD_REMOVE_DEFINITION | DDD_EXACT_MATCH_ON_REMOVE,
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MountPoint, VolumeName);
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BOOLEAN IsServiceContext = 0 != ((DWORD)(UINT_PTR)MountHandle & 1);
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MountHandle = (HANDLE)(UINT_PTR)((DWORD)(UINT_PTR)MountHandle & ~1);
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if (IsServiceContext)
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/*
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* If the current process is in the service context but not LocalSystem,
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* ask the launcher to DefineDosDevice for us. This is because the launcher
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* runs in the LocalSystem context and can remove global drives.
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*/
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FspFileSystemLauncherDefineDosDevice(L'-', MountPoint, VolumeName);
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else
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DefineDosDeviceW(DDD_RAW_TARGET_PATH | DDD_REMOVE_DEFINITION | DDD_EXACT_MATCH_ON_REMOVE,
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MountPoint, VolumeName);
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if (0 != MountHandle)
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FspNtClose(MountHandle);
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@ -566,6 +566,106 @@ FSP_API BOOLEAN FspServiceIsInteractive(VOID)
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return IsInteractive;
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}
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FSP_API NTSTATUS FspServiceContextCheck(HANDLE Token, PBOOLEAN PIsLocalSystem)
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{
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NTSTATUS Result;
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PSID LocalSystemSid, ServiceSid;
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BOOLEAN IsLocalSystem = FALSE;
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BOOL HasServiceSid = FALSE;
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HANDLE ProcessToken = 0, ImpersonationToken = 0;
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DWORD SessionId, Size;
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union
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{
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TOKEN_USER V;
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UINT8 B[128];
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} UserInfoBuf;
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PTOKEN_USER UserInfo = &UserInfoBuf.V;
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LocalSystemSid = FspWksidGet(WinLocalSystemSid);
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ServiceSid = FspWksidGet(WinServiceSid);
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if (0 == LocalSystemSid || 0 == ServiceSid)
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{
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Result = STATUS_INSUFFICIENT_RESOURCES;
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goto exit;
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}
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if (0 == Token)
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{
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if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_DUPLICATE, &ProcessToken) ||
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!DuplicateToken(ProcessToken, SecurityImpersonation, &ImpersonationToken))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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Token = ImpersonationToken;
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}
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if (!GetTokenInformation(Token, TokenSessionId, &SessionId, sizeof SessionId, &Size))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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if (0 != SessionId)
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{
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Result = STATUS_ACCESS_DENIED;
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goto exit;
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}
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if (!GetTokenInformation(Token, TokenUser, UserInfo, sizeof UserInfoBuf, &Size))
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{
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if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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UserInfo = MemAlloc(Size);
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if (0 == UserInfo)
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{
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Result = STATUS_INSUFFICIENT_RESOURCES;
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goto exit;
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}
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if (!GetTokenInformation(Token, TokenUser, UserInfo, Size, &Size))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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}
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IsLocalSystem = EqualSid(LocalSystemSid, UserInfo->User.Sid);
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if (IsLocalSystem)
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{
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Result = STATUS_SUCCESS;
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goto exit;
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}
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if (!CheckTokenMembership(Token, ServiceSid, &HasServiceSid))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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Result = HasServiceSid ? STATUS_SUCCESS : STATUS_ACCESS_DENIED;
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exit:
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if (0 != PIsLocalSystem)
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*PIsLocalSystem = NT_SUCCESS(Result) ? IsLocalSystem : FALSE;
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if (UserInfo != &UserInfoBuf.V)
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MemFree(UserInfo);
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if (0 != ImpersonationToken)
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CloseHandle(ImpersonationToken);
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if (0 != ProcessToken)
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CloseHandle(ProcessToken);
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return Result;
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}
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FSP_API VOID FspServiceLog(ULONG Type, PWSTR Format, ...)
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{
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va_list ap;
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@ -21,8 +21,7 @@ static INIT_ONCE FspWksidInitOnce = INIT_ONCE_STATIC_INIT;
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static PSID FspWksidWorld;
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static PSID FspWksidAuthenticatedUser;
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static PSID FspWksidLocalSystem;
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static PSID FspWksidLocalService;
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static PSID FspWksidNetworkService;
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static PSID FspWksidService;
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static BOOL WINAPI FspWksidInitialize(
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PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
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@ -30,14 +29,12 @@ static BOOL WINAPI FspWksidInitialize(
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FspWksidWorld = FspWksidNew(WinWorldSid, 0);
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FspWksidAuthenticatedUser = FspWksidNew(WinAuthenticatedUserSid, 0);
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FspWksidLocalSystem = FspWksidNew(WinLocalSystemSid, 0);
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FspWksidLocalService = FspWksidNew(WinLocalServiceSid, 0);
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FspWksidNetworkService = FspWksidNew(WinNetworkServiceSid, 0);
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FspWksidService = FspWksidNew(WinServiceSid, 0);
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//DEBUGLOGSID("FspWksidWorld=%s", FspWksidWorld);
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//DEBUGLOGSID("FspWksidAuthenticatedUser=%s", FspWksidAuthenticatedUser);
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//DEBUGLOGSID("FspWksidLocalSystem=%s", FspWksidLocalSystem);
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//DEBUGLOGSID("FspWksidLocalService=%s", FspWksidLocalService);
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//DEBUGLOGSID("FspWksidNetworkService=%s", FspWksidNetworkService);
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//DEBUGLOGSID("FspWksidService=%s", FspWksidService);
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return TRUE;
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}
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@ -57,8 +54,7 @@ VOID FspWksidFinalize(BOOLEAN Dynamic)
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MemFree(FspWksidWorld); FspWksidWorld = 0;
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MemFree(FspWksidAuthenticatedUser); FspWksidAuthenticatedUser = 0;
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MemFree(FspWksidLocalSystem); FspWksidLocalSystem = 0;
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MemFree(FspWksidLocalService); FspWksidLocalService = 0;
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MemFree(FspWksidNetworkService); FspWksidNetworkService = 0;
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MemFree(FspWksidService); FspWksidService = 0;
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}
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}
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@ -104,10 +100,8 @@ PSID FspWksidGet(WELL_KNOWN_SID_TYPE WellKnownSidType)
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return FspWksidAuthenticatedUser;
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case WinLocalSystemSid:
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return FspWksidLocalSystem;
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case WinLocalServiceSid:
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return FspWksidLocalService;
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case WinNetworkServiceSid:
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return FspWksidNetworkService;
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case WinServiceSid:
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return FspWksidService;
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default:
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return 0;
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}
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@ -22,6 +22,13 @@
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#define PROGNAME "WinFsp.Launcher"
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static NTSTATUS (NTAPI *SvcNtOpenSymbolicLinkObject)(
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PHANDLE LinkHandle,
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ACCESS_MASK DesiredAccess,
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POBJECT_ATTRIBUTES ObjectAttributes);
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static NTSTATUS (NTAPI *SvcNtClose)(
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HANDLE Handle);
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BOOL CreateOverlappedPipe(
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PHANDLE PReadPipe, PHANDLE PWritePipe,
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DWORD Size,
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@ -143,6 +150,96 @@ exit:
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return Result;
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}
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static NTSTATUS AddAccessForTokenUser(HANDLE Handle, DWORD Access, HANDLE Token)
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{
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TOKEN_USER *User = 0;
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PSECURITY_DESCRIPTOR SecurityDescriptor = 0;
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PSECURITY_DESCRIPTOR NewSecurityDescriptor = 0;
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EXPLICIT_ACCESSW AccessEntry;
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DWORD Size, LastError;
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NTSTATUS Result;
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if (GetTokenInformation(Token, TokenUser, 0, 0, &Size))
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{
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Result = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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User = MemAlloc(Size);
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if (0 == User)
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{
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Result = STATUS_INSUFFICIENT_RESOURCES;
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goto exit;
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}
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if (!GetTokenInformation(Token, TokenUser, User, Size, &Size))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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if (GetKernelObjectSecurity(Handle, DACL_SECURITY_INFORMATION, 0, 0, &Size))
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{
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Result = STATUS_INVALID_PARAMETER;
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goto exit;
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}
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if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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SecurityDescriptor = MemAlloc(Size);
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if (0 == SecurityDescriptor)
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{
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Result = STATUS_INSUFFICIENT_RESOURCES;
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goto exit;
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}
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if (!GetKernelObjectSecurity(Handle, DACL_SECURITY_INFORMATION, SecurityDescriptor, Size, &Size))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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AccessEntry.grfAccessPermissions = Access;
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AccessEntry.grfAccessMode = GRANT_ACCESS;
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AccessEntry.grfInheritance = NO_INHERITANCE;
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AccessEntry.Trustee.pMultipleTrustee = 0;
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AccessEntry.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
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AccessEntry.Trustee.TrusteeForm = TRUSTEE_IS_SID;
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AccessEntry.Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
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AccessEntry.Trustee.ptstrName = User->User.Sid;
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LastError = BuildSecurityDescriptorW(0, 0, 1, &AccessEntry, 0, 0, SecurityDescriptor,
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&Size, &NewSecurityDescriptor);
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if (0 != LastError)
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{
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Result = FspNtStatusFromWin32(LastError);
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goto exit;
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}
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if (!SetKernelObjectSecurity(Handle, DACL_SECURITY_INFORMATION, NewSecurityDescriptor))
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{
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Result = FspNtStatusFromWin32(GetLastError());
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goto exit;
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}
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Result = STATUS_SUCCESS;
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exit:
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LocalFree(NewSecurityDescriptor);
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MemFree(SecurityDescriptor);
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MemFree(User);
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return Result;
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}
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static BOOL LogonCreateProcess(
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PWSTR UserName,
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LPCWSTR ApplicationName,
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@ -1206,6 +1303,53 @@ NTSTATUS SvcInstanceStopAndWaitAll(VOID)
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return STATUS_SUCCESS;
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}
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NTSTATUS SvcDefineDosDevice(HANDLE ClientToken,
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PWSTR DeviceName, PWSTR TargetPath)
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{
|
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NTSTATUS Result;
|
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|
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if (L'+' != DeviceName[0] && L'-' != DeviceName[0])
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return STATUS_INVALID_PARAMETER;
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Result = FspServiceContextCheck(ClientToken, 0);
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if (!NT_SUCCESS(Result))
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return Result;
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|
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if (!DefineDosDeviceW(
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DDD_RAW_TARGET_PATH |
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(L'+' == DeviceName[0] ? 0 : DDD_REMOVE_DEFINITION | DDD_EXACT_MATCH_ON_REMOVE),
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DeviceName + 1, TargetPath))
|
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return FspNtStatusFromWin32(GetLastError());
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|
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if (L'+' == DeviceName[0] && 0 != SvcNtOpenSymbolicLinkObject)
|
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{
|
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/* The drive symlink now exists; add DELETE access to it for the ClientToken. */
|
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WCHAR SymlinkBuf[6];
|
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UNICODE_STRING Symlink;
|
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OBJECT_ATTRIBUTES Obja;
|
||||
HANDLE MountHandle;
|
||||
|
||||
memcpy(SymlinkBuf, L"\\??\\X:", sizeof SymlinkBuf);
|
||||
SymlinkBuf[4] = DeviceName[1];
|
||||
Symlink.Length = Symlink.MaximumLength = sizeof SymlinkBuf;
|
||||
Symlink.Buffer = SymlinkBuf;
|
||||
|
||||
memset(&Obja, 0, sizeof Obja);
|
||||
Obja.Length = sizeof Obja;
|
||||
Obja.ObjectName = &Symlink;
|
||||
Obja.Attributes = OBJ_CASE_INSENSITIVE;
|
||||
|
||||
Result = SvcNtOpenSymbolicLinkObject(&MountHandle, READ_CONTROL | WRITE_DAC, &Obja);
|
||||
if (NT_SUCCESS(Result))
|
||||
{
|
||||
AddAccessForTokenUser(MountHandle, DELETE, ClientToken);
|
||||
SvcNtClose(MountHandle);
|
||||
}
|
||||
}
|
||||
|
||||
return STATUS_SUCCESS;
|
||||
}
|
||||
|
||||
static HANDLE SvcJob, SvcThread, SvcEvent;
|
||||
static DWORD SvcThreadId;
|
||||
static HANDLE SvcPipe = INVALID_HANDLE_VALUE;
|
||||
@ -1526,6 +1670,7 @@ static VOID SvcPipeTransact(HANDLE ClientToken, PWSTR PipeBuf, PULONG PSize)
|
||||
|
||||
PWSTR P = PipeBuf, PipeBufEnd = PipeBuf + *PSize / sizeof(WCHAR);
|
||||
PWSTR ClassName, InstanceName, UserName;
|
||||
PWSTR DeviceName, TargetPath;
|
||||
ULONG Argc; PWSTR Argv[9];
|
||||
BOOLEAN HasSecret = FALSE;
|
||||
NTSTATUS Result;
|
||||
@ -1587,6 +1732,17 @@ static VOID SvcPipeTransact(HANDLE ClientToken, PWSTR PipeBuf, PULONG PSize)
|
||||
SvcPipeTransactResult(Result, PipeBuf, PSize);
|
||||
break;
|
||||
|
||||
case LauncherDefineDosDevice:
|
||||
DeviceName = SvcPipeTransactGetPart(&P, PipeBufEnd);
|
||||
TargetPath = SvcPipeTransactGetPart(&P, PipeBufEnd);
|
||||
|
||||
Result = STATUS_INVALID_PARAMETER;
|
||||
if (0 != DeviceName && 0 != TargetPath)
|
||||
Result = SvcDefineDosDevice(ClientToken, DeviceName, TargetPath);
|
||||
|
||||
SvcPipeTransactResult(Result, PipeBuf, PSize);
|
||||
break;
|
||||
|
||||
#if !defined(NDEBUG)
|
||||
case LauncherQuit:
|
||||
SetEvent(SvcEvent);
|
||||
@ -1605,6 +1761,19 @@ static VOID SvcPipeTransact(HANDLE ClientToken, PWSTR PipeBuf, PULONG PSize)
|
||||
|
||||
int wmain(int argc, wchar_t **argv)
|
||||
{
|
||||
HANDLE Handle = GetModuleHandleW(L"ntdll.dll");
|
||||
if (0 != Handle)
|
||||
{
|
||||
SvcNtOpenSymbolicLinkObject = (PVOID)GetProcAddress(Handle, "NtOpenSymbolicLinkObject");
|
||||
SvcNtClose = (PVOID)GetProcAddress(Handle, "NtClose");
|
||||
|
||||
if (0 == SvcNtOpenSymbolicLinkObject || 0 == SvcNtClose)
|
||||
{
|
||||
SvcNtOpenSymbolicLinkObject = 0;
|
||||
SvcNtClose = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return FspServiceRun(L"" PROGNAME, SvcStart, SvcStop, 0);
|
||||
}
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
|
||||
#define LAUNCHER_PIPE_NAME "\\\\.\\pipe\\WinFsp.{14E7137D-22B4-437A-B0C1-D21D1BDF3767}"
|
||||
#define LAUNCHER_PIPE_BUFFER_SIZE 4096
|
||||
#define LAUNCHER_PIPE_DEFAULT_TIMEOUT 3000
|
||||
#define LAUNCHER_PIPE_DEFAULT_TIMEOUT (2 * 15000 + 1000)
|
||||
|
||||
#define LAUNCHER_START_WITH_SECRET_TIMEOUT 15000
|
||||
|
||||
@ -62,6 +62,7 @@ enum
|
||||
LauncherSvcInstanceStop = 'T', /* requires: SERVICE_STOP */
|
||||
LauncherSvcInstanceInfo = 'I', /* requires: SERVICE_QUERY_STATUS */
|
||||
LauncherSvcInstanceList = 'L', /* requires: none*/
|
||||
LauncherDefineDosDevice = 'D',
|
||||
LauncherQuit = 'Q', /* DEBUG version only */
|
||||
|
||||
LauncherSuccess = '$',
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user