author | alanb |
Fri, 10 May 2013 14:53:33 +0100 | |
changeset 17451 | 7ee55c117088 |
parent 16473 | 81d282e3cdaf |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.fs; |
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import static sun.nio.fs.WindowsNativeDispatcher.*; |
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import static sun.nio.fs.WindowsConstants.*; |
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/** |
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* Security related utility methods. |
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*/ |
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class WindowsSecurity { |
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private WindowsSecurity() { } |
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// opens process token for given access |
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private static long openProcessToken(int access) { |
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try { |
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return OpenProcessToken(GetCurrentProcess(), access); |
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} catch (WindowsException x) { |
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return 0L; |
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} |
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} |
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/** |
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* Returns the access token for this process with TOKEN_DUPLICATE access |
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*/ |
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static final long processTokenWithDuplicateAccess = |
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openProcessToken(TOKEN_DUPLICATE); |
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/** |
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* Returns the access token for this process with TOKEN_QUERY access |
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*/ |
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static final long processTokenWithQueryAccess = |
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openProcessToken(TOKEN_QUERY); |
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/** |
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* Returned by enablePrivilege when code may require a given privilege. |
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* The drop method should be invoked after the operation completes so as |
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* to revert the privilege. |
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*/ |
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static interface Privilege { |
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void drop(); |
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} |
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/** |
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* Attempts to enable the given privilege for this method. |
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*/ |
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static Privilege enablePrivilege(String priv) { |
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final long pLuid; |
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try { |
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pLuid = LookupPrivilegeValue(priv); |
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} catch (WindowsException x) { |
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// indicates bug in caller |
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throw new AssertionError(x); |
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} |
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long hToken = 0L; |
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boolean impersontating = false; |
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boolean elevated = false; |
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try { |
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hToken = OpenThreadToken(GetCurrentThread(), |
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TOKEN_ADJUST_PRIVILEGES, false); |
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if (hToken == 0L && processTokenWithDuplicateAccess != 0L) { |
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hToken = DuplicateTokenEx(processTokenWithDuplicateAccess, |
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(TOKEN_ADJUST_PRIVILEGES|TOKEN_IMPERSONATE)); |
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SetThreadToken(0L, hToken); |
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impersontating = true; |
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} |
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if (hToken != 0L) { |
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AdjustTokenPrivileges(hToken, pLuid, SE_PRIVILEGE_ENABLED); |
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elevated = true; |
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} |
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} catch (WindowsException x) { |
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// nothing to do, privilege not enabled |
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} |
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final long token = hToken; |
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final boolean stopImpersontating = impersontating; |
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final boolean needToRevert = elevated; |
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return new Privilege() { |
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@Override |
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public void drop() { |
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if (token != 0L) { |
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try { |
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if (stopImpersontating) |
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SetThreadToken(0L, 0L); |
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else if (needToRevert) |
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AdjustTokenPrivileges(token, pLuid, 0); |
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} catch (WindowsException x) { |
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// should not happen |
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throw new AssertionError(x); |
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} finally { |
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CloseHandle(token); |
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} |
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} |
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} |
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}; |
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} |
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|
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/** |
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* Check the access right against the securityInfo in the current thread. |
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*/ |
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static boolean checkAccessMask(long securityInfo, int accessMask, |
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int genericRead, int genericWrite, int genericExecute, int genericAll) |
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throws WindowsException |
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{ |
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int privilegies = TOKEN_QUERY; |
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long hToken = OpenThreadToken(GetCurrentThread(), privilegies, false); |
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if (hToken == 0L && processTokenWithDuplicateAccess != 0L) |
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hToken = DuplicateTokenEx(processTokenWithDuplicateAccess, |
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privilegies); |
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|
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boolean hasRight = false; |
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if (hToken != 0L) { |
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try { |
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hasRight = AccessCheck(hToken, securityInfo, accessMask, |
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genericRead, genericWrite, genericExecute, genericAll); |
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} finally { |
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CloseHandle(hToken); |
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} |
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} |
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return hasRight; |
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} |
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|
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} |