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rufus/src/stdfn.c

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/*
* Rufus: The Reliable USB Formatting Utility
* Standard Windows function calls
* Copyright (c) 2013 Pete Batard <pete@akeo.ie>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif
#include <windows.h>
#include <sddl.h>
#include "msapi_utf8.h"
#include "rufus.h"
enum WindowsVersion nWindowsVersion = WINDOWS_UNDEFINED;
/*
* Detect Windows version
*/
enum WindowsVersion DetectWindowsVersion(void)
{
OSVERSIONINFO OSVersion;
memset(&OSVersion, 0, sizeof(OSVERSIONINFO));
OSVersion.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
if (GetVersionEx(&OSVersion) == 0)
return WINDOWS_UNDEFINED;
if (OSVersion.dwPlatformId != VER_PLATFORM_WIN32_NT)
return WINDOWS_UNSUPPORTED;
// See the Remarks section from http://msdn.microsoft.com/en-us/library/windows/desktop/ms724833.aspx
if ((OSVersion.dwMajorVersion < 5) || ((OSVersion.dwMajorVersion == 5) && (OSVersion.dwMinorVersion == 0)))
return WINDOWS_UNSUPPORTED; // Win2k or earlier
if ((OSVersion.dwMajorVersion == 5) && (OSVersion.dwMinorVersion == 1))
return WINDOWS_XP;
if ((OSVersion.dwMajorVersion == 5) && (OSVersion.dwMinorVersion == 2))
return WINDOWS_2003;
if ((OSVersion.dwMajorVersion == 6) && (OSVersion.dwMinorVersion == 0))
return WINDOWS_VISTA;
if ((OSVersion.dwMajorVersion == 6) && (OSVersion.dwMinorVersion == 1))
return WINDOWS_7;
if ((OSVersion.dwMajorVersion == 6) && (OSVersion.dwMinorVersion == 2))
return WINDOWS_8;
if ((OSVersion.dwMajorVersion > 6) || ((OSVersion.dwMajorVersion == 6) && (OSVersion.dwMinorVersion >= 3)))
return WINDOWS_9;
return WINDOWS_UNSUPPORTED;
}
/*
* String array manipulation
*/
void StrArrayCreate(StrArray* arr, size_t initial_size)
{
if (arr == NULL) return;
arr->Max = initial_size; arr->Index = 0;
arr->Table = (char**)calloc(arr->Max, sizeof(char*));
if (arr->Table == NULL)
uprintf("Could not allocate string array\n");
}
void StrArrayAdd(StrArray* arr, const char* str)
{
char** old_table;
if ((arr == NULL) || (arr->Table == NULL))
return;
if (arr->Index == arr->Max) {
arr->Max *= 2;
old_table = arr->Table;
arr->Table = (char**)realloc(arr->Table, arr->Max*sizeof(char*));
if (arr->Table == NULL) {
free(old_table);
uprintf("Could not reallocate string array\n");
return;
}
}
arr->Table[arr->Index] = safe_strdup(str);
if (arr->Table[arr->Index++] == NULL) {
uprintf("Could not store string in array\n");
}
}
void StrArrayClear(StrArray* arr)
{
size_t i;
if ((arr == NULL) || (arr->Table == NULL))
return;
for (i=0; i<arr->Index; i++) {
safe_free(arr->Table[i]);
}
arr->Index = 0;
}
void StrArrayDestroy(StrArray* arr)
{
StrArrayClear(arr);
if (arr != NULL)
safe_free(arr->Table);
}
/*
* Retrieve the SID of the current user. The returned PSID must be freed by the caller using LocalFree()
*/
static PSID GetSID(void) {
TOKEN_USER* tu = NULL;
DWORD len;
HANDLE token;
PSID ret = NULL;
char* psid_string = NULL;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)) {
uprintf("OpenProcessToken failed: %s\n", WindowsErrorString());
return NULL;
}
if (!GetTokenInformation(token, TokenUser, tu, 0, &len)) {
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
uprintf("GetTokenInformation (pre) failed: %s\n", WindowsErrorString());
return NULL;
}
tu = (TOKEN_USER*)calloc(1, len);
}
if (tu == NULL) {
return NULL;
}
if (GetTokenInformation(token, TokenUser, tu, len, &len)) {
/*
* now of course, the interesting thing is that if you return tu->User.Sid
* but free tu, the PSID pointer becomes invalid after a while.
* The workaround? Convert to string then back to PSID
*/
if (!ConvertSidToStringSidA(tu->User.Sid, &psid_string)) {
uprintf("Unable to convert SID to string: %s\n", WindowsErrorString());
ret = NULL;
} else {
if (!ConvertStringSidToSidA(psid_string, &ret)) {
uprintf("Unable to convert string back to SID: %s\n", WindowsErrorString());
ret = NULL;
}
// MUST use LocalFree()
LocalFree(psid_string);
}
} else {
ret = NULL;
uprintf("GetTokenInformation (real) failed: %s\n", WindowsErrorString());
}
free(tu);
return ret;
}
/*
* read or write I/O to a file
* buffer is allocated by the procedure. path is UTF-8
*/
BOOL FileIO(BOOL save, char* path, char** buffer, DWORD* size)
{
SECURITY_ATTRIBUTES s_attr, *ps = NULL;
SECURITY_DESCRIPTOR s_desc;
PSID sid = NULL;
HANDLE handle;
BOOL r;
BOOL ret = FALSE;
// Change the owner from admin to regular user
sid = GetSID();
if ( (sid != NULL)
&& InitializeSecurityDescriptor(&s_desc, SECURITY_DESCRIPTOR_REVISION)
&& SetSecurityDescriptorOwner(&s_desc, sid, FALSE) ) {
s_attr.nLength = sizeof(SECURITY_ATTRIBUTES);
s_attr.bInheritHandle = FALSE;
s_attr.lpSecurityDescriptor = &s_desc;
ps = &s_attr;
} else {
uprintf("Could not set security descriptor: %s\n", WindowsErrorString());
}
if (!save) {
*buffer = NULL;
}
handle = CreateFileU(path, save?GENERIC_WRITE:GENERIC_READ, FILE_SHARE_READ,
ps, save?CREATE_ALWAYS:OPEN_EXISTING, 0, NULL);
if (handle == INVALID_HANDLE_VALUE) {
uprintf("Could not %s file '%s'\n", save?"create":"open", path);
goto out;
}
if (save) {
r = WriteFile(handle, *buffer, *size, size, NULL);
} else {
*size = GetFileSize(handle, NULL);
*buffer = (char*)malloc(*size);
if (*buffer == NULL) {
uprintf("Could not allocate buffer for reading file\n");
goto out;
}
r = ReadFile(handle, *buffer, *size, size, NULL);
}
if (!r) {
uprintf("I/O Error: %s\n", WindowsErrorString());
goto out;
}
PrintStatus(0, TRUE, "%s '%s'", save?"Saved":"Opened", path);
ret = TRUE;
out:
CloseHandle(handle);
if (!ret) {
// Only leave a buffer allocated if successful
*size = 0;
if (!save) {
safe_free(*buffer);
}
}
return ret;
}
unsigned char* GetResource(HMODULE module, char* name, char* type, const char* desc, DWORD* len, BOOL duplicate)
{
HGLOBAL res_handle;
HRSRC res;
unsigned char* p = NULL;
res = FindResourceA(module, name, type);
if (res == NULL) {
uprintf("Unable to locate resource '%s': %s\n", desc, WindowsErrorString());
goto out;
}
res_handle = LoadResource(module, res);
if (res_handle == NULL) {
uprintf("Unable to load resource '%s': %s\n", desc, WindowsErrorString());
goto out;
}
*len = SizeofResource(module, res);
if (duplicate) {
p = (unsigned char*)malloc(*len);
if (p == NULL) {
uprintf("Unable to allocate ldlinux.sys resource\n");
goto out;
}
memcpy(p, LockResource(res_handle), *len);
} else {
p = (unsigned char*)LockResource(res_handle);
}
out:
return p;
}
/*
* Set or restore a Local Group Policy DWORD key indexed by szPath/SzPolicy
*/
#pragma push_macro("INTERFACE")
#undef INTERFACE
#define INTERFACE IGroupPolicyObject
#define REGISTRY_EXTENSION_GUID { 0x35378EAC, 0x683F, 0x11D2, {0xA8, 0x9A, 0x00, 0xC0, 0x4F, 0xBB, 0xCF, 0xA2} }
#define GPO_OPEN_LOAD_REGISTRY 1
#define GPO_SECTION_MACHINE 2
typedef enum _GROUP_POLICY_OBJECT_TYPE {
GPOTypeLocal = 0, GPOTypeRemote, GPOTypeDS
} GROUP_POLICY_OBJECT_TYPE, *PGROUP_POLICY_OBJECT_TYPE;
DECLARE_INTERFACE_(IGroupPolicyObject, IUnknown) {
STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID *ppvObj) PURE;
STDMETHOD_(ULONG, AddRef) (THIS) PURE;
STDMETHOD_(ULONG, Release) (THIS) PURE;
STDMETHOD(New) (THIS_ LPOLESTR pszDomainName, LPOLESTR pszDisplayName, DWORD dwFlags) PURE;
STDMETHOD(OpenDSGPO) (THIS_ LPOLESTR pszPath, DWORD dwFlags) PURE;
STDMETHOD(OpenLocalMachineGPO) (THIS_ DWORD dwFlags) PURE;
STDMETHOD(OpenRemoteMachineGPO) (THIS_ LPOLESTR pszComputerName, DWORD dwFlags) PURE;
STDMETHOD(Save) (THIS_ BOOL bMachine, BOOL bAdd,GUID *pGuidExtension, GUID *pGuid) PURE;
STDMETHOD(Delete) (THIS) PURE;
STDMETHOD(GetName) (THIS_ LPOLESTR pszName, int cchMaxLength) PURE;
STDMETHOD(GetDisplayName) (THIS_ LPOLESTR pszName, int cchMaxLength) PURE;
STDMETHOD(SetDisplayName) (THIS_ LPOLESTR pszName) PURE;
STDMETHOD(GetPath) (THIS_ LPOLESTR pszPath, int cchMaxPath) PURE;
STDMETHOD(GetDSPath) (THIS_ DWORD dwSection, LPOLESTR pszPath ,int cchMaxPath) PURE;
STDMETHOD(GetFileSysPath) (THIS_ DWORD dwSection, LPOLESTR pszPath, int cchMaxPath) PURE;
STDMETHOD(GetRegistryKey) (THIS_ DWORD dwSection, HKEY *hKey) PURE;
STDMETHOD(GetOptions) (THIS_ DWORD *dwOptions) PURE;
STDMETHOD(SetOptions) (THIS_ DWORD dwOptions, DWORD dwMask) PURE;
STDMETHOD(GetType) (THIS_ GROUP_POLICY_OBJECT_TYPE *gpoType) PURE;
STDMETHOD(GetMachineName) (THIS_ LPOLESTR pszName, int cchMaxLength) PURE;
STDMETHOD(GetPropertySheetPages) (THIS_ HPROPSHEETPAGE **hPages, UINT *uPageCount) PURE;
};
typedef IGroupPolicyObject *LPGROUPPOLICYOBJECT;
BOOL SetLGP(BOOL bRestore, BOOL* bExistingKey, const char* szPath, const char* szPolicy, DWORD dwValue)
{
LONG r;
DWORD disp, regtype, val=0, val_size=sizeof(DWORD);
HRESULT hr;
IGroupPolicyObject* pLGPO;
// Along with global 'existing_key', this static value is used to restore initial state
static DWORD original_val;
HKEY path_key = NULL, policy_key = NULL;
// MSVC is finicky about these ones => redefine them
const IID my_IID_IGroupPolicyObject =
{ 0xea502723, 0xa23d, 0x11d1, { 0xa7, 0xd3, 0x0, 0x0, 0xf8, 0x75, 0x71, 0xe3 } };
const IID my_CLSID_GroupPolicyObject =
{ 0xea502722, 0xa23d, 0x11d1, { 0xa7, 0xd3, 0x0, 0x0, 0xf8, 0x75, 0x71, 0xe3 } };
GUID ext_guid = REGISTRY_EXTENSION_GUID;
// Can be anything really
GUID snap_guid = { 0x3D271CFC, 0x2BC6, 0x4AC2, {0xB6, 0x33, 0x3B, 0xDF, 0xF5, 0xBD, 0xAB, 0x2A} };
// We need an IGroupPolicyObject instance to set a Local Group Policy
hr = CoCreateInstance(&my_CLSID_GroupPolicyObject, NULL, CLSCTX_INPROC_SERVER, &my_IID_IGroupPolicyObject, (LPVOID*)&pLGPO);
if (FAILED(hr)) {
uprintf("SetLGP: CoCreateInstance failed; hr = %x\n", hr);
goto error;
}
hr = pLGPO->lpVtbl->OpenLocalMachineGPO(pLGPO, GPO_OPEN_LOAD_REGISTRY);
if (FAILED(hr)) {
uprintf("SetLGP: OpenLocalMachineGPO failed - error %x\n", hr);
goto error;
}
hr = pLGPO->lpVtbl->GetRegistryKey(pLGPO, GPO_SECTION_MACHINE, &path_key);
if (FAILED(hr)) {
uprintf("SetLGP: GetRegistryKey failed - error %x\n", hr);
goto error;
}
// The DisableSystemRestore is set in Software\Policies\Microsoft\Windows\DeviceInstall\Settings
r = RegCreateKeyExA(path_key, szPath, 0, NULL, 0, KEY_SET_VALUE | KEY_QUERY_VALUE,
NULL, &policy_key, &disp);
if (r != ERROR_SUCCESS) {
uprintf("SetLGP: Failed to open LGPO path %s - error %x\n", szPath, hr);
goto error;
}
if ((disp == REG_OPENED_EXISTING_KEY) && (!bRestore) && (!(*bExistingKey))) {
// backup existing value for restore
*bExistingKey = TRUE;
regtype = REG_DWORD;
r = RegQueryValueExA(policy_key, szPolicy, NULL, &regtype, (LPBYTE)&original_val, &val_size);
if (r == ERROR_FILE_NOT_FOUND) {
// The Key exists but not its value, which is OK
*bExistingKey = FALSE;
} else if (r != ERROR_SUCCESS) {
uprintf("SetLGP: Failed to read original %s policy value - error %x\n", szPolicy, r);
}
}
if ((!bRestore) || (*bExistingKey)) {
val = (bRestore)?original_val:dwValue;
r = RegSetValueExA(policy_key, szPolicy, 0, REG_DWORD, (BYTE*)&val, sizeof(val));
} else {
r = RegDeleteValueA(policy_key, szPolicy);
}
if (r != ERROR_SUCCESS) {
uprintf("SetLGP: RegSetValueEx / RegDeleteValue failed - error %x\n", r);
}
RegCloseKey(policy_key);
policy_key = NULL;
// Apply policy
hr = pLGPO->lpVtbl->Save(pLGPO, TRUE, (bRestore)?FALSE:TRUE, &ext_guid, &snap_guid);
if (r != S_OK) {
uprintf("SetLGP: Unable to apply %s policy - error %x\n", szPolicy, hr);
goto error;
} else {
if ((!bRestore) || (*bExistingKey)) {
uprintf("SetLGP: Successfully %s %s policy to 0x%08X\n", (bRestore)?"restored":"set", szPolicy, val);
} else {
uprintf("SetLGP: Successfully removed %s policy key\n", szPolicy);
}
}
RegCloseKey(path_key);
pLGPO->lpVtbl->Release(pLGPO);
return TRUE;
error:
if (path_key != NULL) RegCloseKey(path_key);
if (policy_key != NULL) RegCloseKey(policy_key);
if (pLGPO != NULL) pLGPO->lpVtbl->Release(pLGPO);
return FALSE;
}
#pragma pop_macro("INTERFACE")
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