| /* |
| * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.fs; |
| |
| import static sun.nio.fs.WindowsNativeDispatcher.*; |
| import static sun.nio.fs.WindowsConstants.*; |
| |
| /** |
| * Security related utility methods. |
| */ |
| |
| class WindowsSecurity { |
| private WindowsSecurity() { } |
| |
| // opens process token for given access |
| private static long openProcessToken(int access) { |
| try { |
| return OpenProcessToken(GetCurrentProcess(), access); |
| } catch (WindowsException x) { |
| return 0L; |
| } |
| } |
| |
| /** |
| * Returns the access token for this process with TOKEN_DUPLICATE access |
| */ |
| static final long processTokenWithDuplicateAccess = |
| openProcessToken(TOKEN_DUPLICATE); |
| |
| /** |
| * Returns the access token for this process with TOKEN_QUERY access |
| */ |
| static final long processTokenWithQueryAccess = |
| openProcessToken(TOKEN_QUERY); |
| |
| /** |
| * Returned by enablePrivilege when code may require a given privilege. |
| * The drop method should be invoked after the operation completes so as |
| * to revert the privilege. |
| */ |
| static interface Privilege { |
| void drop(); |
| } |
| |
| /** |
| * Attempts to enable the given privilege for this method. |
| */ |
| static Privilege enablePrivilege(String priv) { |
| final long pLuid; |
| try { |
| pLuid = LookupPrivilegeValue(priv); |
| } catch (WindowsException x) { |
| // indicates bug in caller |
| throw new AssertionError(x); |
| } |
| |
| long hToken = 0L; |
| boolean impersontating = false; |
| boolean elevated = false; |
| try { |
| hToken = OpenThreadToken(GetCurrentThread(), |
| TOKEN_ADJUST_PRIVILEGES, false); |
| if (hToken == 0L && processTokenWithDuplicateAccess != 0L) { |
| hToken = DuplicateTokenEx(processTokenWithDuplicateAccess, |
| (TOKEN_ADJUST_PRIVILEGES|TOKEN_IMPERSONATE)); |
| SetThreadToken(0L, hToken); |
| impersontating = true; |
| } |
| |
| if (hToken != 0L) { |
| AdjustTokenPrivileges(hToken, pLuid, SE_PRIVILEGE_ENABLED); |
| elevated = true; |
| } |
| } catch (WindowsException x) { |
| // nothing to do, privilege not enabled |
| } |
| |
| final long token = hToken; |
| final boolean stopImpersontating = impersontating; |
| final boolean needToRevert = elevated; |
| |
| return new Privilege() { |
| @Override |
| public void drop() { |
| if (token != 0L) { |
| try { |
| if (stopImpersontating) |
| SetThreadToken(0L, 0L); |
| else if (needToRevert) |
| AdjustTokenPrivileges(token, pLuid, 0); |
| } catch (WindowsException x) { |
| // should not happen |
| throw new AssertionError(x); |
| } finally { |
| CloseHandle(token); |
| } |
| } |
| } |
| }; |
| } |
| |
| /** |
| * Check the access right against the securityInfo in the current thread. |
| */ |
| static boolean checkAccessMask(long securityInfo, int accessMask, |
| int genericRead, int genericWrite, int genericExecute, int genericAll) |
| throws WindowsException |
| { |
| int privileges = TOKEN_QUERY; |
| long hToken = OpenThreadToken(GetCurrentThread(), privileges, false); |
| if (hToken == 0L && processTokenWithDuplicateAccess != 0L) |
| hToken = DuplicateTokenEx(processTokenWithDuplicateAccess, |
| privileges); |
| |
| boolean hasRight = false; |
| if (hToken != 0L) { |
| try { |
| hasRight = AccessCheck(hToken, securityInfo, accessMask, |
| genericRead, genericWrite, genericExecute, genericAll); |
| } finally { |
| CloseHandle(hToken); |
| } |
| } |
| return hasRight; |
| } |
| |
| } |