The CHOWN application was designed to be a small command line tool that demonstrates that it is possible to assign a new owner to a file, even if Microsoft asserts that this is impossible. Not the first implementation of such a program, but source is included, so you may understand how this works.
To set a new owner of a file, only ordinary Win32 API calls are needed. All you have to do is:
– enable the Backup, Restore and Take Ownership privileges (with AdjustTokenPrivileges()). These are usually granted to Administrators. I also enable the Bypass Traverse Checking privilege, but I have not yet fully investigated if this is really necessary.
– find the SID for the new owner with GetAccountSid()
– create an empty Security Descriptor with InitializeSecurityDescriptor()
– fill the owner of the Security Descriptor with SetSecurityDescriptorOwner(), ignore group, DACL and SACL
– apply this SD to the file you want to modify with SetFileSecurity(szCurrentFile,(SECURITY_INFORMATION)(OWNER_SECURITY_INFORMATION),…)
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The CHOWN application will parse the command line arguments and print the owner and group assigned to the specified file.
CHOWN Usage:
The application’s main function is a usage statement:
CHOWN [-S] [-G] [Full path to input file]
-S: Specify the SID for the new owner
-G: Specify the SID for the new group
The individual arguments are as follows:
-s: Specify the SID for the new owner. Default is the current process user’s SID.
-g: Specify the SID for the new group. Default is the current process user’s SID.
C:Documents and SettingsDefault UserDesktopCHOWN-v1.0>
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Note that the SID of a process is usually determined by that process calling GetCurrentProcessId() and returning this process ID, but there are other ways.
Also, this program is very limited. Other programs implement file permissions in user and group names and would not use the owner and group names of the current process. The application only finds a file, sets its attributes and prints the owner and group. There is also no attempt to check what the previous owner and group were; this is intentionally done.
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I have added a GetFileInfo function that finds and prints file information. This is necessary because the GetFileAttributes function used to find file information (like the owner and group) is incomplete. The GetFileAttributes function can only find attributes in a directory, not in a file. For files, the GetFileAttributes function returns 0x80000001 (INVALID_FILE_ATTRIBUTES) when passed a random file, even when a normal directory listing should return sensible information.
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By default, SetOwnerSecurity() sets the owner of an object to a user and a group. The user and group may be specified by a SID; the user may also be specified by an NT Object Manager (NTOM) user account name.
To change the owner of a file to a non-NTOM user, set the USER and GROUP fields of the SECURITY_ATTRIBUTES structure to a string of the form ntom\[user name] (or just [user name] for a superuser). For more information about the USER and GROUP fields, see Security Descriptor Options in the Microsoft Knowledge Base (KB).
If the USER and GROUP fields of the SECURITY_ATTRIBUTES structure are not specified, the process has no special privilege that would allow it to change the owner of a file, and the change is blocked by the standard mechanism.
CHOWN Full Crack Possibilities:
Before you can transfer ownership of an object (usually a file), there are security checks to be passed. In order to pass these, the CHOWN application either needs access to the object or the ability to create a process or a thread that can have the necessary privileges.
Here are the different ways the CHOWN application can access files, and the kind of privilege it needs for each of them:
– Using the API with rights that allow Backup and Restore, Take Ownership and Permission to bypass Traverse checking (SETFILEFLAG_DELETEONREBUILD, SECURITY_IMPERSONATION_LEVEL::MS_PRIVILEGE_NONE,
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– Using the API with rights that allow Backup and Restore, Take Ownership and Modify DACL (SETFILEFLAG_DELETEONREBUILD)
– Using the API with rights that allow Backup and Restore, Modify DACL and full control permissions (SETFILEFLAG_DELETEONREBUILD)
– Using the API with only a token for the new user
– Using a process as an administrator and creating the process with privileges that allow Backup, Restore, Take Ownership and Permission to bypass Traverse checking (SECURITY_IMPERSONATION_LEVEL::MS_BATCH_PROCESS)
The example program uses some of these possibilities and demonstrates how this works. Normally, a program would have to use the API with all
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There are several files that belong to the Administrators group by default, such as the Internet Explorer start menu file. Microsoft has closed all file share access to these files, so changing their owner is impossible. CHOWN Application (a demonstration that you can change the owner of files) uses a clever trick to “construct” a new owner from several values. This is possible because the Administrators group and the local Administrators group are different. CHOWN checks if the specified file exists and is owned by that Administrators group. If it doesn’t, it uses the specified owner and group as the new owner and group. If it does, it immediately terminates with an error.
Application Author:
Hans Becker / Dr. Heiko Heitzmann / Jennifer McFarlane
CHOWN is available for download at
CHOWN Download:
Source Code:
www.freeware.org/GK/CHOWN.zip
CHOWN Licensing:
This program is given free of charge. You may distribute it to anyone you wish, but if you do so, please give a reference to the source site and the original author.
CHOWN Usage:
CHOWN App
% cd / && cd CHOWN_Demo
% makensis main.asm /tlb:CHOWN.tlb /dll:CHOWN.dll /f Makefile.txt
% java -jar CHOWN_Demo.jar
CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN CHOWN
What’s New In?
Changes the owner of a file. The owner SID can be changed to the SID of the user running the process or to the SID of a different user. If the specified SID is a user SID, the process must have the SE_BACKUP_NAME privilege. If the specified SID is a group SID, then the process must have the SE_RESTORE_NAME privilege. A special case is used for SetSecurityInformation in which the specified SID will be the SID of the owner for the object. This is the same as a delete-owner operation. Returns TRUE if the request was successful, FALSE if the operation was not supported or the owner of the file could not be found. If the owner of the file changes, the directory in which the file resides is modified, as if a chown(2) command was issued, and should be restored. This also causes all files owned by the original owner to be changed to the new owner. With the default options, the files are not modified.
CHOWN Installation:
chown | version | owner | file
DLLs:
CHOWN | C | V | Owner | File
CHOWN | C | V | Owner | File
Example:
rem SET THE PERMISSIONS ON THE FILE FILE TO THE SID OF DOMAINUSER
rem SET THE SID OF THE FILE TO DOMAINBUILTIN
rem SET THE FILE TO EITHER BUILTIN OR DOMAINUSER
rem SET FILE SECURITY INFORMATION
rem CHOWN FILE USING SECURITY DESCRIPTOR
rem CHOWN FILE USING NO SECURITY DESCRIPTOR
Code:
/*
Copyright (c) 2010, Oran Sanderson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY ORAN SANDERSON ”AS IS” AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT
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System Requirements:
Xbox One X / Xbox One S
AMD Radeon™ Pro Duo
Minimum spec:
OS: Windows® 10
Processor: Intel® Core i5-6600K or AMD equivalent
Memory: 8GB RAM
Graphics: AMD Radeon™ RX 470, AMD Radeon™ R9 380 or NVIDIA GTX 950
Hard Disk: 50GB free space
Windows® 10 CPU: Intel® Core i5-6600K or AMD equivalent
Process
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