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Windows: fix SetupAPI issue on some machines where it fails to handle properly AddReg/DelReg operations during System encryption/decryption wizard.

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This commit is contained in:
Mounir IDRASSI 2016-08-16 00:19:19 +02:00
parent a7056a6ac3
commit 1bf219b0dc
No known key found for this signature in database
GPG Key ID: DD0C382D5FCFB8FC
1 changed files with 178 additions and 11 deletions
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169
src/Common/BootEncryption.cpp
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@ -3424,6 +3424,87 @@ namespace VeraCrypt
#endif // SETUP
static bool CompareMultiString (const char* str1, const char* str2)
{
size_t l1, l2;
if (!str1 || !str2)
return false;
while (true)
{
l1 = strlen (str1);
l2 = strlen (str2);
if (l1 == l2)
{
if (l1 == 0)
break; // we reached the end
if (_stricmp (str1, str2) == 0)
{
str1 += l1 + 1;
str2 += l2 + 1;
}
else
return false;
}
else
return false;
}
return true;
}
static void AppendToMultiString (char* mszDest, DWORD dwMaxDesSize, DWORD& dwDestSize, const char* input)
{
// find the index of the end of the last string
DWORD dwInputSize = (DWORD) strlen (input) + 1;
DWORD index = dwDestSize;
while (index > 0 && mszDest[index - 1] == 0)
index--;
if (dwMaxDesSize > (index + 1 + dwInputSize + 1))
{
if (index == 0)
{
StringCchCopyA ((char *) mszDest, dwMaxDesSize, input);
mszDest [dwInputSize] = 0;
dwDestSize = dwInputSize + 1;
}
else
{
mszDest[index] = 0;
StringCchCopyA ((char *) &mszDest[index + 1], dwMaxDesSize - index - 1, input);
mszDest [index + 1 + dwInputSize] = 0;
dwDestSize = index + 1 + dwInputSize + 1;
}
}
}
// mszDest is guaranteed to be double zero terminated
static bool RemoveFromMultiString (char* mszDest, DWORD& dwDestSize, const char* input)
{
bool bRet = false;
if (mszDest && input)
{
DWORD offset, remainingSize = dwDestSize;
while (*mszDest)
{
if (_stricmp (mszDest, input) == 0)
{
offset = (DWORD) strlen (input) + 1;
memmove (mszDest, mszDest + offset, remainingSize - offset);
dwDestSize -= offset;
bRet = true;
break;
}
offset = (DWORD) strlen (mszDest) + 1;
mszDest += offset;
remainingSize -= offset;
}
}
return bRet;
}
void BootEncryption::RegisterFilter (bool registerFilter, FilterType filterType, const GUID *deviceClassGuid)
{
string filter;
@ -3458,7 +3539,9 @@ namespace VeraCrypt
finally_do_arg (HKEY, regKey, { RegCloseKey (finally_arg); });
if (registerFilter && filterType != DumpFilter)
if (registerFilter)
{
if (filterType != DumpFilter)
{
// Register class filter below all other filters in the stack
@ -3477,7 +3560,91 @@ namespace VeraCrypt
}
else
{
// workaround rare SetupInstallFromInfSection which overwrite value instead of appending new value
// read initial value
DWORD strSize = (DWORD) filter.size() + 1, expectedSize;
Buffer expectedRegKeyBuf(65536), outputRegKeyBuf(65536);
byte* pbExpectedRegKeyBuf = expectedRegKeyBuf.Ptr ();
byte* pbOutputRegKeyBuf = outputRegKeyBuf.Ptr ();
DWORD initialSize = (DWORD) (expectedRegKeyBuf.Size() - strSize - 2);
if (RegQueryValueExA (regKey, filterReg.c_str(), NULL, NULL, pbExpectedRegKeyBuf, &initialSize) != ERROR_SUCCESS)
{
StringCchCopyA ((char *) pbExpectedRegKeyBuf, expectedRegKeyBuf.Size(), filter.c_str());
pbExpectedRegKeyBuf [strSize] = 0;
expectedSize = strSize + 1;
}
else
{
expectedSize = initialSize;
AppendToMultiString ((char *) pbExpectedRegKeyBuf, (DWORD) expectedRegKeyBuf.Size(), expectedSize, filter.c_str());
}
RegisterDriverInf (registerFilter, filter, filterReg, ParentWindow, regKey);
// check if operation successful
initialSize = (DWORD) outputRegKeyBuf.Size() - 2;
if (RegQueryValueExA (regKey, filterReg.c_str(), NULL, NULL, pbOutputRegKeyBuf, &initialSize) != ERROR_SUCCESS)
{
pbOutputRegKeyBuf [0] = 0;
pbOutputRegKeyBuf [1] = 0;
}
else
{
// append two \0 at the end if they are missing
if (pbOutputRegKeyBuf [initialSize - 1] != 0)
{
pbOutputRegKeyBuf [initialSize] = 0;
pbOutputRegKeyBuf [initialSize + 1] = 0;
}
else if (pbOutputRegKeyBuf [initialSize - 2] != 0)
{
pbOutputRegKeyBuf [initialSize] = 0;
}
}
if (!CompareMultiString ((char *) pbExpectedRegKeyBuf, (char *) pbOutputRegKeyBuf))
{
// Set value manually
SetLastError (RegSetValueExA (regKey, filterReg.c_str(), 0, REG_MULTI_SZ, pbExpectedRegKeyBuf, expectedSize));
throw_sys_if (GetLastError() != ERROR_SUCCESS);
}
}
}
else
{
RegisterDriverInf (registerFilter, filter, filterReg, ParentWindow, regKey);
// remove value in case it was not done properly
Buffer regKeyBuf(65536);
byte* pbRegKeyBuf = regKeyBuf.Ptr ();
DWORD initialSize = (DWORD) regKeyBuf.Size() - 2;
if ( (RegQueryValueExA (regKey, filterReg.c_str(), NULL, NULL, pbRegKeyBuf, &initialSize) == ERROR_SUCCESS)
&& (initialSize >= ((DWORD) filter.size()))
)
{
// append two \0 at the end if they are missing
if (pbRegKeyBuf [initialSize - 1] != 0)
{
pbRegKeyBuf [initialSize] = 0;
pbRegKeyBuf [initialSize + 1] = 0;
initialSize += 2;
}
else if (pbRegKeyBuf [initialSize - 2] != 0)
{
pbRegKeyBuf [initialSize] = 0;
initialSize ++;
}
if (RemoveFromMultiString ((char*) pbRegKeyBuf, initialSize, filter.c_str()))
{
// Set value manually
SetLastError (RegSetValueExA (regKey, filterReg.c_str(), 0, REG_MULTI_SZ, pbRegKeyBuf, initialSize));
throw_sys_if (GetLastError() != ERROR_SUCCESS);
}
}
}
}