RetroZilla/toolkit/xre/nsWindowsRestart.cpp

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2015-10-21 05:03:22 +02:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla XULRunner bootstrap.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg <benjamin@smedbergs.us>.
*
* Portions created by the Initial Developer are Copyright (C) 2005
* the Mozilla Foundation. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// This file is not build directly. Instead, it is included in multiple
// shared objects.
#ifdef nsWindowsRestart_cpp
#error "nsWindowsRestart.cpp is not a header file, and must only be included once."
#else
#define nsWindowsRestart_cpp
#endif
#include <shellapi.h>
#ifndef ERROR_ELEVATION_REQUIRED
#define ERROR_ELEVATION_REQUIRED 740L
#endif
BOOL (WINAPI *pCreateProcessWithTokenW)(HANDLE,
DWORD,
LPCWSTR,
LPWSTR,
DWORD,
LPVOID,
LPCWSTR,
LPSTARTUPINFOW,
LPPROCESS_INFORMATION);
BOOL (WINAPI *pIsUserAnAdmin)(VOID);
BOOL (WINAPI *pDuplicateTokenEx)(HANDLE,
DWORD,
LPSECURITY_ATTRIBUTES,
SECURITY_IMPERSONATION_LEVEL,
TOKEN_TYPE,
PHANDLE);
/**
* Get the length that the string will take when it is quoted.
*/
static int QuotedStrLen(const char *s)
{
int i = 2; // initial and final quote
while (*s) {
if (*s == '"') {
++i;
}
++i; ++s;
}
return i;
}
/**
* Copy string "s" to string "d", quoting and escaping all double quotes.
* The CRT parses this to retrieve the original argc/argv that we meant,
* see STDARGV.C in the MSVC6 CRT sources.
*
* @return the end of the string
*/
static char* QuoteString(char *d, const char *s)
{
*d = '"';
++d;
while (*s) {
*d = *s;
if (*s == '"') {
++d;
*d = '"';
}
++d; ++s;
}
*d = '"';
++d;
return d;
}
/**
* Create a quoted command from a list of arguments. The returned string
* is allocated with "malloc" and should be "free"d.
*/
static char*
MakeCommandLine(int argc, char **argv)
{
int i;
int len = 1; // null-termination
for (i = 0; i < argc; ++i)
len += QuotedStrLen(argv[i]) + 1;
char *s = (char*) malloc(len);
if (!s)
return NULL;
char *c = s;
for (i = 0; i < argc; ++i) {
c = QuoteString(c, argv[i]);
*c = ' ';
++c;
}
*c = '\0';
return s;
}
/**
* alloc and convert multibyte char to unicode char
*/
static PRUnichar *
AllocConvertAToW(const char *buf)
{
PRUint32 inputLen = strlen(buf) + 1;
int n = MultiByteToWideChar(CP_ACP, 0, buf, inputLen, NULL, 0);
if (n <= 0)
return NULL;
PRUnichar *result = (PRUnichar *)malloc(n * sizeof(PRUnichar));
if (!result)
return NULL;
MultiByteToWideChar(CP_ACP, 0, buf, inputLen, result, n);
return result;
}
/**
* Launch a child process without elevated privilege.
*/
static BOOL
LaunchAsNormalUser(const char *exePath, char *cl)
{
if (!pCreateProcessWithTokenW) {
// IsUserAnAdmin is not present on Win9x and not exported by name on Win2k
*(FARPROC *)&pIsUserAnAdmin =
GetProcAddress(GetModuleHandle("shell32.dll"), "IsUserAnAdmin");
// CreateProcessWithTokenW is not present on WinXP or earlier
*(FARPROC *)&pCreateProcessWithTokenW =
GetProcAddress(GetModuleHandle("advapi32.dll"),
"CreateProcessWithTokenW");
if (!pCreateProcessWithTokenW)
return FALSE;
// DuplicateTokenEx is not present on WinME and Win9x.
*(FARPROC *)&pDuplicateTokenEx =
GetProcAddress(GetModuleHandle("advapi32.dll"), "DuplicateTokenEx");
if (!pDuplicateTokenEx)
return FALSE;
}
// do nothing here if we are not elevated or IsUserAnAdmin is not present.
if (!pIsUserAnAdmin || pIsUserAnAdmin && !pIsUserAnAdmin())
return FALSE;
// borrow the shell token to drop the privilege
HWND hwndShell = FindWindow("Progman", NULL);
DWORD dwProcessId;
GetWindowThreadProcessId(hwndShell, &dwProcessId);
HANDLE hProcessShell = OpenProcess(MAXIMUM_ALLOWED, FALSE, dwProcessId);
if (!hProcessShell)
return FALSE;
HANDLE hTokenShell;
BOOL ok = OpenProcessToken(hProcessShell, MAXIMUM_ALLOWED, &hTokenShell);
CloseHandle(hProcessShell);
if (!ok)
return FALSE;
HANDLE hNewToken;
ok = pDuplicateTokenEx(hTokenShell,
MAXIMUM_ALLOWED,
NULL,
SecurityDelegation,
TokenPrimary,
&hNewToken);
CloseHandle(hTokenShell);
if (!ok)
return FALSE;
STARTUPINFOW si = {sizeof(si), 0};
PROCESS_INFORMATION pi = {0};
PRUnichar *exePathW = AllocConvertAToW(exePath);
PRUnichar *clW = AllocConvertAToW(cl);
ok = exePathW && clW;
if (ok) {
ok = pCreateProcessWithTokenW(hNewToken,
0, // profile is already loaded
exePathW,
clW,
0, // No special process creation flags
NULL, // inherit my environment
NULL, // use my current directory
&si,
&pi);
}
free(exePathW);
free(clW);
CloseHandle(hNewToken);
if (!ok)
return FALSE;
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return TRUE;
}
/**
* Launch a child process with the specified arguments.
* @param needElevation 1:need elevation, -1:want to drop priv, 0:don't care
* @note argv[0] is ignored
*/
BOOL
WinLaunchChild(const char *exePath, int argc, char **argv, int needElevation)
{
char *cl;
BOOL ok;
if (needElevation > 0) {
cl = MakeCommandLine(argc - 1, argv + 1);
if (!cl)
return FALSE;
ok = ShellExecute(NULL, // no special UI window
NULL, // use default verb
exePath,
cl,
NULL, // use my current directory
SW_SHOWDEFAULT) > (HINSTANCE)32;
free(cl);
return ok;
}
cl = MakeCommandLine(argc, argv);
if (!cl)
return FALSE;
if (needElevation < 0) {
// try to launch as a normal user first
ok = LaunchAsNormalUser(exePath, cl);
// if it fails, fallback to normal launching
if (!ok)
needElevation = 0;
}
if (needElevation == 0) {
STARTUPINFO si = {sizeof(si), 0};
PROCESS_INFORMATION pi = {0};
ok = CreateProcess(exePath,
cl,
NULL, // no special security attributes
NULL, // no special thread attributes
FALSE, // don't inherit filehandles
0, // No special process creation flags
NULL, // inherit my environment
NULL, // use my current directory
&si,
&pi);
if (ok) {
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
}
}
free(cl);
return ok;
}