Erik Aronesty <[email protected]> added the comment:
Series of operations needed to answer the questions os.access is not answering
on windows:
bool CanAccessFolder( LPCTSTR folderName, DWORD genericAccessRights )
{
bool bRet = false;
DWORD length = 0;
if (!::GetFileSecurity( folderName, OWNER_SECURITY_INFORMATION |
GROUP_SECURITY_INFORMATION
| DACL_SECURITY_INFORMATION, NULL, NULL, &length ) &&
ERROR_INSUFFICIENT_BUFFER == ::GetLastError()) {
PSECURITY_DESCRIPTOR security = static_cast< PSECURITY_DESCRIPTOR >(
::malloc( length ) );
if (security && ::GetFileSecurity( folderName,
OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION
| DACL_SECURITY_INFORMATION, security, length,
&length )) {
HANDLE hToken = NULL;
if (::OpenProcessToken( ::GetCurrentProcess(), TOKEN_IMPERSONATE |
TOKEN_QUERY |
TOKEN_DUPLICATE | STANDARD_RIGHTS_READ, &hToken )) {
HANDLE hImpersonatedToken = NULL;
if (::DuplicateToken( hToken, SecurityImpersonation,
&hImpersonatedToken )) {
GENERIC_MAPPING mapping = { 0xFFFFFFFF };
PRIVILEGE_SET privileges = { 0 };
DWORD grantedAccess = 0, privilegesLength = sizeof(
privileges );
BOOL result = FALSE;
mapping.GenericRead = FILE_GENERIC_READ;
mapping.GenericWrite = FILE_GENERIC_WRITE;
mapping.GenericExecute = FILE_GENERIC_EXECUTE;
mapping.GenericAll = FILE_ALL_ACCESS;
::MapGenericMask( &genericAccessRights, &mapping );
if (::AccessCheck( security, hImpersonatedToken,
genericAccessRights,
&mapping, &privileges, &privilegesLength,
&grantedAccess, &result )) {
bRet = (result == TRUE);
}
::CloseHandle( hImpersonatedToken );
}
::CloseHandle( hToken );
}
::free( security );
}
}
return bRet;
}
----------
nosy: +earonesty
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Python tracker <[email protected]>
<https://bugs.python.org/issue22107>
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