+#ifndef STATUS_PRIVILEGE_NOT_HELD
+#define STATUS_PRIVILEGE_NOT_HELD (NTSTATUS)0xC0000061
+#endif
+#ifndef PROCESSINFOCLASS
+#define PROCESSINFOCLASS DWORD
+#endif
+#ifndef ProcessUserModeIOPL
+#define ProcessUserModeIOPL 16
+#endif
+typedef NTSTATUS (NTAPI *NtSetInformationProcessProt)(HANDLE ProcessHandle, PROCESSINFOCLASS ProcessInformationClass, PVOID ProcessInformation, ULONG ProcessInformationLength);
+
+/*
+ * Check if the current thread has particular privilege in current active access
+ * token. Case when it not possible to determinate it (e.g. current thread does
+ * not have permission to open its own current active access token) is evaluated
+ * as thread does not have that privilege.
+ */
+static BOOL
+have_privilege(LUID luid_privilege)
+{
+ PRIVILEGE_SET priv;
+ HANDLE token;
+ BOOL ret;
+
+ /*
+ * If the current thread does not have active access token then thread
+ * uses primary process access token for all permission checks.
+ */
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) &&
+ (GetLastError() != ERROR_NO_TOKEN ||
+ !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)))
+ return FALSE;
+
+ priv.PrivilegeCount = 1;
+ priv.Control = PRIVILEGE_SET_ALL_NECESSARY;
+ priv.Privilege[0].Luid = luid_privilege;
+ priv.Privilege[0].Attributes = SE_PRIVILEGE_ENABLED;
+
+ if (!PrivilegeCheck(token, &priv, &ret))
+ return FALSE;
+
+ return ret;
+}
+
+/*
+ * Enable or disable particular privilege in specified access token.
+ *
+ * Note that it is not possible to disable privilege in access token with
+ * SE_PRIVILEGE_ENABLED_BY_DEFAULT attribute. This function does not check
+ * this case and incorrectly returns no error even when disabling failed.
+ * Rationale for this decision: Simplification of this function as WinAPI
+ * call AdjustTokenPrivileges() does not signal error in this case too.
+ */
+static BOOL
+set_privilege(HANDLE token, LUID luid_privilege, BOOL enable)
+{
+ TOKEN_PRIVILEGES token_privileges;
+
+ token_privileges.PrivilegeCount = 1;
+ token_privileges.Privileges[0].Luid = luid_privilege;
+ token_privileges.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
+
+ /*
+ * WinAPI function AdjustTokenPrivileges() success also when not all
+ * privileges were enabled. It is always required to check for failure
+ * via GetLastError() call. AdjustTokenPrivileges() always sets error
+ * also when it success, as opposite to other WinAPI functions.
+ */
+ if (!AdjustTokenPrivileges(token, FALSE, &token_privileges, sizeof(token_privileges), NULL, NULL) ||
+ GetLastError() != ERROR_SUCCESS)
+ return FALSE;
+
+ return TRUE;
+}
+
+/*
+ * Change access token for the current thread to new specified access token.
+ * Previously active access token is stored in old_token variable and can be
+ * used for reverting to this access token. It is set to NULL if the current
+ * thread previously used primary process access token.
+ */
+static BOOL
+change_token(HANDLE new_token, HANDLE *old_token)
+{
+ HANDLE token;
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token))
+ {
+ if (GetLastError() != ERROR_NO_TOKEN)
+ return FALSE;
+ token = NULL;
+ }
+
+ if (!ImpersonateLoggedOnUser(new_token))
+ {
+ if (token)
+ CloseHandle(token);
+ return FALSE;
+ }
+
+ *old_token = token;
+ return TRUE;
+}
+
+/*
+ * Change access token for the current thread to the primary process access
+ * token. This function fails also when the current thread already uses primary
+ * process access token.
+ */
+static BOOL
+change_token_to_primary(HANDLE *old_token)
+{
+ HANDLE token;
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token))
+ return FALSE;
+
+ RevertToSelf();
+
+ *old_token = token;
+ return TRUE;
+}
+
+/*
+ * Revert to the specified access token for the current thread. When access
+ * token is specified as NULL then revert to the primary process access token.
+ * Use to revert after change_token() or change_token_to_primary() call.
+ */
+static VOID
+revert_to_token(HANDLE token)
+{
+ /*
+ * If SetThreadToken() call fails then there is no option to revert to
+ * the specified previous thread access token. So in this case revert to
+ * the primary process access token.
+ */
+ if (!token || !SetThreadToken(NULL, token))
+ RevertToSelf();
+ if (token)
+ CloseHandle(token);
+}
+
+/*
+ * Enable particular privilege for the current thread. And set method how to
+ * revert this privilege (if to revert whole token or only privilege).
+ */
+static BOOL
+enable_privilege(LUID luid_privilege, HANDLE *revert_token, BOOL *revert_only_privilege)
+{
+ HANDLE thread_token;
+ HANDLE new_token;
+
+ if (OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &thread_token))
+ {
+ if (set_privilege(thread_token, luid_privilege, TRUE))
+ {
+ /*
+ * Indicate that correct revert method is just to
+ * disable privilege in access token.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ *revert_token = thread_token;
+ *revert_only_privilege = TRUE;
+ }
+ else
+ {
+ CloseHandle(thread_token);
+ }
+ return TRUE;
+ }
+ CloseHandle(thread_token);
+ /*
+ * If enabling privilege failed then try to enable it via
+ * primary process access token.
+ */
+ }
+
+ /*
+ * If the current thread has already active thread access token then
+ * open it with just impersonate right as it would be used only for
+ * future revert.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &thread_token))
+ {
+ if (GetLastError() != ERROR_NO_TOKEN)
+ return FALSE;
+ thread_token = NULL;
+ }
+
+ /*
+ * If current thread has no access token (and uses primary
+ * process access token) or it does not have permission to
+ * adjust privileges or it does not have specified privilege
+ * then create a copy of the primary process access token,
+ * assign it for the current thread (= impersonate self)
+ * and then try adjusting privilege again.
+ */
+ if (!ImpersonateSelf(SecurityImpersonation))
+ {
+ if (thread_token)
+ CloseHandle(thread_token);
+ return FALSE;
+ }
+ }
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &new_token))
+ {
+ /* thread_token is set only when we were asked for revert method. */
+ if (revert_token && revert_only_privilege)
+ revert_to_token(thread_token);
+ return FALSE;
+ }
+
+ if (!set_privilege(new_token, luid_privilege, TRUE))
+ {
+ CloseHandle(new_token);
+ /* thread_token is set only when we were asked for revert method. */
+ if (revert_token && revert_only_privilege)
+ revert_to_token(thread_token);
+ return FALSE;
+ }
+
+ /*
+ * Indicate that correct revert method is to change to the previous
+ * access token. Either to the primary process access token or to the
+ * previous thread access token.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ *revert_token = thread_token;
+ *revert_only_privilege = FALSE;
+ }
+ return TRUE;
+}
+
+/*
+ * Revert particular privilege for the current thread was previously enabled by
+ * enable_privilege() call. Either disable privilege in specified access token
+ * or revert to previous access token.
+ */
+static VOID
+revert_privilege(LUID luid_privilege, HANDLE revert_token, BOOL revert_only_privilege)
+{
+ if (revert_only_privilege)
+ {
+ set_privilege(revert_token, luid_privilege, FALSE);
+ CloseHandle(revert_token);
+ }
+ else
+ {
+ revert_to_token(revert_token);
+ }
+}
+
+/*
+ * Return owner of the access token used by the current thread. Buffer for
+ * returned owner needs to be released by LocalFree() call.
+ */
+static TOKEN_OWNER *
+get_current_token_owner(VOID)
+{
+ HANDLE token;
+ DWORD length;
+ TOKEN_OWNER *owner;
+
+ /*
+ * If the current thread does not have active access token then thread
+ * uses primary process access token for all permission checks.
+ */
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) &&
+ (GetLastError() != ERROR_NO_TOKEN ||
+ !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)))
+ return NULL;
+
+ if (!GetTokenInformation(token, TokenOwner, NULL, 0, &length) &&
+ GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+ {
+ CloseHandle(token);
+ return NULL;
+ }
+
+retry:
+ owner = (TOKEN_OWNER *)LocalAlloc(LPTR, length);
+ if (!owner)
+ {
+ CloseHandle(token);
+ return NULL;
+ }
+
+ if (!GetTokenInformation(token, TokenOwner, owner, length, &length))
+ {
+ /*
+ * Length of token owner (SID) buffer between two get calls may
+ * changes (e.g. by another thread of process), so retry.
+ */
+ if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
+ {
+ LocalFree(owner);
+ goto retry;
+ }
+ LocalFree(owner);
+ CloseHandle(token);
+ return NULL;
+ }
+
+ CloseHandle(token);
+ return owner;
+}
+
+/*
+ * Grant particular permissions in the primary access token of the specified
+ * process for the owner of current thread token and set old DACL of the
+ * process access token for reverting permissions. Security descriptor is
+ * just memory buffer for old DACL.
+ */
+static BOOL
+grant_process_token_dacl_permissions(HANDLE process, DWORD permissions, HANDLE *token, PACL *old_dacl, PSECURITY_DESCRIPTOR *security_descriptor)
+{
+ GetSecurityInfoProt MyGetSecurityInfo;
+ SetSecurityInfoProt MySetSecurityInfo;
+ SetEntriesInAclProt MySetEntriesInAcl;
+ EXPLICIT_ACCESS explicit_access;
+ TOKEN_OWNER *owner;
+ HMODULE advapi32;
+ PACL new_dacl;
+
+ /*
+ * This source file already uses advapi32.dll library, so it is
+ * linked to executable and automatically loaded when starting
+ * current running process.
+ */
+ advapi32 = GetModuleHandle(TEXT("advapi32.dll"));
+ if (!advapi32)
+ return FALSE;
+
+ /*
+ * It does not matter if SetEntriesInAclA() or SetEntriesInAclW() is
+ * called as no string is passed to SetEntriesInAcl function.
+ */
+ MyGetSecurityInfo = (GetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "GetSecurityInfo");
+ MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo");
+ MySetEntriesInAcl = (SetEntriesInAclProt)(LPVOID)GetProcAddress(advapi32, "SetEntriesInAclA");
+ if (!MyGetSecurityInfo || !MySetSecurityInfo || !MySetEntriesInAcl)
+ return FALSE;
+
+ owner = get_current_token_owner();
+ if (!owner)
+ return FALSE;
+
+ /*
+ * READ_CONTROL is required for GetSecurityInfo(DACL_SECURITY_INFORMATION)
+ * and WRITE_DAC is required for SetSecurityInfo(DACL_SECURITY_INFORMATION).
+ */
+ if (!OpenProcessToken(process, READ_CONTROL | WRITE_DAC, token))
+ {
+ LocalFree(owner);
+ return FALSE;
+ }
+
+ if (MyGetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL, security_descriptor) != ERROR_SUCCESS)
+ {
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ /*
+ * Set new explicit access for the owner of the current thread access
+ * token with non-inherited granting access to specified permissions.
+ */
+ explicit_access.grfAccessPermissions = permissions;
+ explicit_access.grfAccessMode = GRANT_ACCESS;
+ explicit_access.grfInheritance = NO_PROPAGATE_INHERIT_ACE;
+ explicit_access.Trustee.pMultipleTrustee = NULL;
+ explicit_access.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+ explicit_access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+ explicit_access.Trustee.TrusteeType = TRUSTEE_IS_USER;
+ /*
+ * Unfortunately i586-mingw32msvc toolchain does not have pSid pointer
+ * member in Trustee union. So assign owner SID to ptstrName pointer
+ * member which aliases with pSid pointer member in the same union.
+ */
+ explicit_access.Trustee.ptstrName = (PVOID)owner->Owner;
+
+ if (MySetEntriesInAcl(1, &explicit_access, *old_dacl, &new_dacl) != ERROR_SUCCESS)
+ {
+ LocalFree(*security_descriptor);
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ if (MySetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, new_dacl, NULL) != ERROR_SUCCESS)
+ {
+ LocalFree(new_dacl);
+ LocalFree(*security_descriptor);
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ LocalFree(new_dacl);
+ LocalFree(owner);
+ return TRUE;
+}
+
+/*
+ * Revert particular granted permissions in specified access token done by
+ * grant_process_token_dacl_permissions() call.
+ */
+static VOID
+revert_token_dacl_permissions(HANDLE token, PACL old_dacl, PSECURITY_DESCRIPTOR security_descriptor)
+{
+ SetSecurityInfoProt MySetSecurityInfo;
+ HMODULE advapi32;
+
+ /*
+ * This source file already uses advapi32.dll library, so it is
+ * linked to executable and automatically loaded when starting
+ * current running process.
+ */
+ advapi32 = GetModuleHandle(TEXT("advapi32.dll"));
+ if (advapi32)
+ {
+ MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo");
+ MySetSecurityInfo(token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL);
+ }
+
+ LocalFree(security_descriptor);
+ CloseHandle(token);
+}
+
+/*
+ * Change error mode of the current thread. If it is not possible then change
+ * error mode of the whole process. Always returns previous error mode.
+ */
+static UINT
+change_error_mode(UINT new_mode)
+{
+ SetThreadErrorModeProt MySetThreadErrorMode = NULL;
+ HMODULE kernel32;
+ DWORD old_mode;
+
+ /*
+ * Function SetThreadErrorMode() was introduced in Windows 7, so use
+ * GetProcAddress() for compatibility with older systems.
+ */
+ kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+ if (kernel32)
+ MySetThreadErrorMode = (SetThreadErrorModeProt)(LPVOID)GetProcAddress(kernel32, "SetThreadErrorMode");
+
+ if (MySetThreadErrorMode &&
+ MySetThreadErrorMode(new_mode, &old_mode))
+ return old_mode;
+
+ /*
+ * Fallback to function SetErrorMode() which modifies error mode of the
+ * whole process and returns old mode.
+ */
+ return SetErrorMode(new_mode);
+}
+
+/*
+ * Open process handle specified by the process id with the query right and
+ * optionally also with vm read right.
+ */
+static HANDLE
+open_process_for_query(DWORD pid, BOOL with_vm_read)
+{
+ BOOL revert_only_privilege;
+ LUID luid_debug_privilege;
+ OSVERSIONINFO version;
+ DWORD process_right;
+ HANDLE revert_token;
+ HANDLE process;
+
+ /*
+ * Some processes on Windows Vista and higher systems can be opened only
+ * with PROCESS_QUERY_LIMITED_INFORMATION right. This right is enough
+ * for accessing primary process token. But this right is not supported
+ * on older pre-Vista systems. When the current thread on these older
+ * systems does not have Debug privilege then OpenProcess() fails with
+ * ERROR_ACCESS_DENIED. If the current thread has Debug privilege then
+ * OpenProcess() success and returns handle to requested process.
+ * Problem is that this handle does not have PROCESS_QUERY_INFORMATION
+ * right and so cannot be used for accessing primary process token
+ * on those older systems. Moreover it has zero rights and therefore
+ * such handle is fully useless. So never try to use open process with
+ * PROCESS_QUERY_LIMITED_INFORMATION right on older systems than
+ * Windows Vista (NT 6.0).
+ */
+ version.dwOSVersionInfoSize = sizeof(version);
+ if (GetVersionEx(&version) &&
+ version.dwPlatformId == VER_PLATFORM_WIN32_NT &&
+ version.dwMajorVersion >= 6)
+ process_right = PROCESS_QUERY_LIMITED_INFORMATION;
+ else
+ process_right = PROCESS_QUERY_INFORMATION;
+
+ if (with_vm_read)
+ process_right |= PROCESS_VM_READ;
+
+ process = OpenProcess(process_right, FALSE, pid);
+ if (process)
+ return process;
+
+ /*
+ * It is possible to open only processes to which owner of the current
+ * thread access token has permissions. For opening other processing it
+ * is required to have Debug privilege enabled. By default local
+ * administrators have this privilege, but it is disabled. So try to
+ * enable it and then try to open process again.
+ */
+
+ if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid_debug_privilege))
+ return NULL;
+
+ if (!enable_privilege(luid_debug_privilege, &revert_token, &revert_only_privilege))
+ return NULL;
+
+ process = OpenProcess(process_right, FALSE, pid);
+
+ revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
+
+ return process;
+}
+
+/*
+ * Check if process image path name (wide string) matches exe file name
+ * (7-bit ASCII string). Do case-insensitive string comparison. Process
+ * image path name can be in any namespace format (DOS, Win32, UNC, ...).
+ */
+static BOOL
+check_process_name(LPCWSTR path, DWORD path_length, LPCSTR exe_file)
+{
+ DWORD exe_file_length;
+ WCHAR c1;
+ UCHAR c2;
+ DWORD i;
+
+ exe_file_length = 0;
+ while (exe_file[exe_file_length] != '\0')
+ exe_file_length++;
+
+ /* Path must have backslash before exe file name. */
+ if (exe_file_length >= path_length ||
+ path[path_length-exe_file_length-1] != L'\\')
+ return FALSE;
+
+ for (i = 0; i < exe_file_length; i++)
+ {
+ c1 = path[path_length-exe_file_length+i];
+ c2 = exe_file[i];
+ /*
+ * Input string for comparison is 7-bit ASCII and file name part
+ * of path must not contain backslash as it is path separator.
+ */
+ if (c1 >= 0x80 || c2 >= 0x80 || c1 == L'\\')
+ return FALSE;
+ if (c1 >= L'a' && c1 <= L'z')
+ c1 -= L'a' - L'A';
+ if (c2 >= 'a' && c2 <= 'z')
+ c2 -= 'a' - 'A';
+ if (c1 != c2)
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Open process handle with the query right specified by process exe file. */
+static HANDLE
+find_and_open_process_for_query(LPCSTR exe_file)
+{
+ GetProcessImageFileNameWProt MyGetProcessImageFileNameW;
+ GetModuleFileNameExWProt MyGetModuleFileNameExW;
+ EnumProcessesProt MyEnumProcesses;
+ HMODULE kernel32, psapi;
+ UINT prev_error_mode;
+ DWORD partial_retry;
+ BOOL found_process;
+ DWORD size, length;
+ DWORD *processes;
+ HANDLE process;
+ LPWSTR path;
+ DWORD error;
+ DWORD count;
+ DWORD i;
+
+ psapi = NULL;
+ kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+ if (!kernel32)
+ return NULL;