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Windows Registry FUSE filesystem
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THE WINDOWS REGISTRY FUSE FILESYSTEM ==================================== If you have any questions, comments, or patches, send me an email: email@example.com One of the most difficult things to deal with in years of writing Linux utilities to work with and repair Windows PCs is the Windows registry. While many excellent tools exist to work with NTFS filesystems and to change and remove passwords from user accounts, the ability to work with the registry has always been severely lacking. Included in the excellent chntpw package is a primitive registry editor "reged" which has largely been quite helpful and I have been grateful for its existence, but it suffers from a very limited interface and a complete lack of scriptability that presents a major hurdle for anyone wanting to do more with the registry than wipe out a password or change the "Start" flag of a system service. Because of the serious limitations of "reged," the only practical way to do anything registry-oriented with a shell script was to export an ENTIRE HIVE to a .reg file, crudely parse the file for what you want, create a .reg file from the script to import the changes, and import them. Needless to say, the process is slow, complicated, and frustrating. I even wrote a tool called "read_inf_section" to help my scripts parse INF/INI/REG files faster because of this need (but also for an unrelated need to read .inf files from driver packages.) This complexity became too excessive, so I came up with a much better way to tweak the registry from shell scripts and programs. Thus, the Windows Registry FUSE Filesystem "winregfs" was born. chntpw ( http://pogostick.net/~pnh/ntpasswd/ ) has an excellent library for working with Windows NT registry hive files, distributed under the LGPL. winregfs is essentially a glue layer between ntreg.c and FUSE, translating Windows registry keys and values into ordinary directories and files. Features include: * Full write support (value size limited to 8192 bytes) * Case-insensitivity in key/value name matching * Automatic forward-slash escaping (gets around the Linux pathname limitation) * "Wildcard" name matching on reads, i.e. "cat foo/bar" matches "foo/bar.sz" * Friendly DWORD editing in hexadecimal ASCII text rather than raw data Also included is a tool called "fsck.winregfs" which will perform a basic check of the integrity of a registry hive. It recursively follows all possible keys and values, checking for errors in offsets, reading data, and value types. To use it, type "fsck.winregfs [hivename]" and when the scan completes a detailed list of statistics and error counts will be produced. The exit status can be checked (i.e. in a script) for success or failure of the check. A few keys and value names in the Windows registry such as MIME types contain forward slash characters; winregfs substitutes "_SLASH_" where a forward slash appears in names. To use winregfs, make a directory to mount on and point it to the registry hive of interest: --- $ mkdir reg $ mount.winregfs /mnt/sdc2/Windows/System32/config/software reg/ --- Now, you can see everything in that hive under "reg": --- $ ls reg 7-Zip/ Google/ Policies/ AVAST Software/ InstalledOptions/ Program Groups/ Adobe/ Intel/ RegisteredApplications/ Analog Devices/ LibreOffice/ S3/ C07ft5Y/ Macromedia/ Schlumberger/ Classes/ Microsoft/ Secure/ Clients/ Mozilla/ Sigmatel/ Diskeeper Corporation/ MozillaPlugins/ The Document Foundation/ GNU/ NVIDIA Corporation/ Windows 3.1 Migration Status/ Gabest/ ODBC/ mozilla.org/ Gemplus/ Piriform/ --- Let's say you want to see some things that automatically run during startup. --- $ ls -l reg/Microsoft/Windows/CurrentVersion/Run total 0 -r--r--r-- 1 root root 118 Dec 31 1969 Adobe ARM.sz -r--r--r-- 1 root root 124 Dec 31 1969 DiskeeperSystray.sz -r--r--r-- 1 root root 60 Dec 31 1969 HotKeysCmds.sz -r--r--r-- 1 root root 66 Dec 31 1969 IgfxTray.sz -r--r--r-- 1 root root 70 Dec 31 1969 KernelFaultCheck.esz -r--r--r-- 1 root root 66 Dec 31 1969 Persistence.sz -r--r--r-- 1 root root 100 Dec 31 1969 SoundMAXPnP.sz -r--r--r-- 1 root root 118 Dec 31 1969 avast.sz --- You want to see what these values contain. --- $ for X in reg/Microsoft/Windows/CurrentVersion/Run/* > do echo -en "$X\n "; cat "$X"; echo; done reg/Microsoft/Windows/CurrentVersion/Run/Adobe ARM.sz "C:\Program Files\Common Files\Adobe\ARM\1.0\AdobeARM.exe" reg/Microsoft/Windows/CurrentVersion/Run/DiskeeperSystray.sz "C:\Program Files\Diskeeper Corporation\Diskeeper\DkIcon.exe" reg/Microsoft/Windows/CurrentVersion/Run/HotKeysCmds.sz C:\WINDOWS\system32\hkcmd.exe reg/Microsoft/Windows/CurrentVersion/Run/IgfxTray.sz C:\WINDOWS\system32\igfxtray.exe reg/Microsoft/Windows/CurrentVersion/Run/KernelFaultCheck.esz %systemroot%\system32\dumprep 0 -k reg/Microsoft/Windows/CurrentVersion/Run/Persistence.sz C:\WINDOWS\system32\igfxpers.exe reg/Microsoft/Windows/CurrentVersion/Run/SoundMAXPnP.sz C:\Program Files\Analog Devices\Core\smax4pnp.exe reg/Microsoft/Windows/CurrentVersion/Run/avast.sz "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui --- Has anything hijacked the Windows "shell" value that runs explorer.exe? --- $ cat reg/Microsoft/Windows\ NT/CurrentVersion/Winlogon/Shell.sz Explorer.exe --- How about the userinit.exe value? --- $ cat reg/Microsoft/Windows\ NT/CurrentVersion/Winlogon/Userinit.sz C:\WINDOWS\system32\userinit.exe, --- Perhaps check if some system policies are set (note that REG_DWORD values now work as friendly hexadecimal text files instead of raw data): --- $ cat \ > reg/Policies/Microsoft/Windows/System/Allow-LogonScript-NetbiosDisabled.dw 00000001 You can probably figure out what to do with it from here. ;-) LICENSING NOTICE ---------------- ntreg.c and ntreg.h are distributed under the terms of the LGPL as described in LGPL.txt while all other winregfs components are licensed under the terms of the GNU GPL as described in LICENSE.