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283 lines (225 loc) · 5.78 KB
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/* run.c */
#define _WIN32_WINNT 0x0600
#define MINGW_HAS_SECURE_API
#include <windows.h>
#include <winsafer.h>
#include <rpc.h>
#include <stdio.h>
#include <stdlib.h>
#include <tchar.h>
#include "include/child.h"
#include "child_private.h"
#ifdef UNICODE
typedef RPC_WSTR RPC_TSTR;
#else
typedef RPC_CSTR RPC_TSTR;
#endif /* UNICODE */
extern errno_t getenv_s(size_t *, char *, size_t, const char *);
static int CheckEnvironment(const _TCHAR *cszName)
{
_TCHAR *szValue;
int iResult = 0;
size_t nSize;
_tgetenv_s(&nSize, NULL, 0, cszName);
if (nSize == 0)
return 0;
szValue = (_TCHAR *) malloc(nSize * sizeof(_TCHAR));
if (szValue == NULL)
return 0;
_tgetenv_s(&nSize, szValue, nSize, cszName);
if (!_tcsicmp(szValue, _TEXT("yes")))
iResult = 1;
free(szValue);
return iResult;
}
static inline BOOL RestrictToken(PHANDLE phToken)
{
BOOL bResult = TRUE;
BOOL bSuccess;
DWORD dwLevelId;
SAFER_LEVEL_HANDLE LevelHandle;
dwLevelId = CheckEnvironment(LIBCHILD_UNTRUSTED)
? SAFER_LEVELID_UNTRUSTED : SAFER_LEVELID_CONSTRAINED;
bSuccess = SaferCreateLevel(SAFER_SCOPEID_USER, dwLevelId,
SAFER_LEVEL_OPEN, &LevelHandle, NULL);
if (!bSuccess)
return FALSE;
bSuccess = SaferComputeTokenFromLevel(LevelHandle, NULL, phToken,
0, NULL);
if (!bSuccess)
bResult = FALSE;
SaferCloseLevel(LevelHandle);
return bResult;
}
static inline void ChangeErrorMode(PUINT puOldMode)
{
UINT uMode;
uMode = GetErrorMode();
*puOldMode = uMode;
if (CheckEnvironment(LIBCHILD_SILENT))
uMode |= ERROR_MODE_FLAGS;
else
uMode &= ~ERROR_MODE_FLAGS;
SetErrorMode(uMode);
}
static _TCHAR *GeneratePipeName(void)
{
UUID Uuid;
RPC_TSTR StringUuid;
_TCHAR *szName;
int nNeeded;
if (UuidCreate(&Uuid) != RPC_S_OK)
return NULL;
if (UuidToString(&Uuid, &StringUuid) != RPC_S_OK)
return NULL;
nNeeded = _sntprintf(NULL, 0, PIPE_PREFIX _TEXT("%s"), StringUuid);
szName = (_TCHAR *) malloc(nNeeded * sizeof(_TCHAR));
if (szName != NULL)
_stprintf(szName, PIPE_PREFIX _TEXT("%s"), StringUuid);
RpcStringFree(&StringUuid);
return szName;
}
static BOOL CreateRedirectionPipe(PHANDLE phPipeLocal,
PHANDLE phPipeInheritable)
{
BOOL bResult = TRUE;
DWORD dwOpenMode;
DWORD dwPipeMode;
_TCHAR *szName;
SECURITY_ATTRIBUTES SecurityAttributes = {
.nLength = sizeof(SECURITY_ATTRIBUTES),
.lpSecurityDescriptor = NULL,
.bInheritHandle = TRUE
};
szName = GeneratePipeName();
if (szName == NULL)
return FALSE;
dwOpenMode = PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE |
FILE_FLAG_OVERLAPPED;
dwPipeMode = PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT;
*phPipeLocal = CreateNamedPipe(szName, dwOpenMode, dwPipeMode, 1,
PIPE_BUFSIZ, PIPE_BUFSIZ, 0, NULL);
if (*phPipeLocal == INVALID_HANDLE_VALUE) {
bResult = FALSE;
goto envOut;
}
*phPipeInheritable = CreateFile(szName, GENERIC_READ | GENERIC_WRITE,
0, &SecurityAttributes, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
free(szName);
if (*phPipeInheritable == INVALID_HANDLE_VALUE)
bResult = FALSE;
envOut:
free(szName);
return bResult;
}
static HANDLE CreateAndAdjustJobObject(void)
{
BOOL bSuccess;
HANDLE hJob;
JOBOBJECT_EXTENDED_LIMIT_INFORMATION JobObjectInfo = {
.BasicLimitInformation.LimitFlags =
JOB_OBJECT_LIMIT_ACTIVE_PROCESS |
JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE,
.BasicLimitInformation.ActiveProcessLimit = 1
};
hJob = CreateJobObject(NULL, NULL);
if (hJob == NULL)
return NULL;
bSuccess = SetInformationJobObject(hJob,
JobObjectExtendedLimitInformation,
&JobObjectInfo,
sizeof(JobObjectInfo));
if (!bSuccess) {
CloseHandle(hJob);
return NULL;
}
return hJob;
}
static BOOL StartChildProcess(const _TCHAR *cszCommand, HANDLE hJob,
LPSTARTUPINFO lpStartupInfo)
{
BOOL bResult = TRUE;
BOOL bSuccess;
HANDLE hToken;
PROCESS_INFORMATION ProcessInformation;
UINT uOldMode;
_TCHAR *szCommand;
szCommand = _tcsdup(cszCommand);
if (szCommand == NULL)
return FALSE;
bSuccess = RestrictToken(&hToken);
if (!bSuccess) {
bResult = FALSE;
goto envOut;
}
ChangeErrorMode(&uOldMode);
bSuccess = CreateProcessAsUser(hToken, NULL, szCommand, NULL, NULL,
TRUE, CREATE_SUSPENDED, NULL, NULL,
lpStartupInfo, &ProcessInformation);
SetErrorMode(uOldMode);
if (bSuccess) {
AssignProcessToJobObject(hJob, ProcessInformation.hProcess);
ResumeThread(ProcessInformation.hThread);
CloseHandle(ProcessInformation.hProcess);
CloseHandle(ProcessInformation.hThread);
} else {
bResult = FALSE;
}
CloseHandle(hToken);
envOut:
free(szCommand);
return bResult;
}
_CHILDIMP HCHILD __cdecl child_create(const _TCHAR *cszCommand)
{
BOOL bSuccess;
HANDLE hPipeInheritable;
HANDLE hPipeLocal;
HANDLE hJob;
HCHILD hcl;
STARTUPINFO StartupInfo = { 0 };
hcl = (HCHILD) malloc(sizeof(CHILD));
if (hcl == NULL)
return NULL;
hJob = CreateAndAdjustJobObject();
if (hJob == NULL) {
free(hcl);
return NULL;
}
bSuccess = CreateRedirectionPipe(&hPipeLocal, &hPipeInheritable);
if (!bSuccess) {
free(hcl);
CloseHandle(hJob);
return NULL;
}
StartupInfo.cb = sizeof(STARTUPINFO);
StartupInfo.dwFlags = STARTF_USESTDHANDLES;
StartupInfo.hStdInput = hPipeInheritable;
StartupInfo.hStdOutput = hPipeInheritable;
StartupInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);
bSuccess = StartChildProcess(cszCommand, hJob, &StartupInfo);
CloseHandle(hPipeInheritable);
if (!bSuccess) {
free(hcl);
CloseHandle(hJob);
CloseHandle(hPipeLocal);
return NULL;
}
hcl->hJob = hJob;
hcl->hPipe = hPipeLocal;
hcl->pchReadBuf = NULL;
hcl->nReadCount = 0;
hcl->pchWriteBuf = NULL;
hcl->nWriteCount = 0;
hcl->iFlags = 0;
return hcl;
}
_CHILDIMP void __cdecl child_terminate(HCHILD hcl)
{
CloseHandle(hcl->hJob);
CloseHandle(hcl->hPipe);
free(hcl->pchReadBuf);
free(hcl->pchWriteBuf);
free(hcl);
}