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Version: 9 August 2008 (debian - 07/07/09)

Section: 1 (Commandes utilisateur)


reglookup - Windows NT+ registry reader/lookup tool


reglookup [options] registry-file .SH DESCRIPTION reglookup is designed to read windows registry elements and print them out to stdout in a CSV-like format. It has filtering options to narrow the focus of the output. This tool is designed to work with on Windows NT/2K/XP/2K3/Vista registries, though your mileage may vary.


reglookup accepts the following parameters:
-p prefix-filter
Specify a path prefix filter. Only keys/values under this registry path will be output.
-t type-filter
Specify a type filter. Only elements which match this registry data type will be printed. Acceptable values are: NONE, SZ, EXPAND_SZ, BINARY, DWORD, DWORD_BE, LINK, MULTI_SZ, RSRC_LIST, RSRC_DESC, RSRC_REQ_LIST, QWORD and KEY .TP -h Enables the printing of a column header row. (default)
Disables the printing of a column header row.
Adds four additional columns to output containing information from key security descriptors. The columns are: owner, group, sacl, dacl. (This feature's output has not been extensively tested.)
Disables the printing of security descriptor information. (default)
Verbose output. (Currently does little to nothing.)
Required argument. Specifies the location of the registry file to read. The system registry files should be found under: %SystemRoot%/system32/config.


reglookup generates comma-separated values (CSV) and writes them to stdout. The format is designed to simplify parsing algorithms of other tools by quoting CSV special characters using a common hexadecimal format. Specifically, special characters or non-ascii bytes are converted to "\xQQ" where QQ is the hexadecimal value for the byte.

The number of columns or fields in each line is fixed for a given run of the program, but may vary based on the command line options provided. See the header line for information on which fields are available and what they contain.

Some fields in some lines may contain sub-fields which require additional delimiters. If these sub-delimiters occur in these sub-fields, they are also encoded in the same way as commas or other special characters are. Currently, the second, third, and fourth level delimiters are "|", ":", and " ", respectively. These are particularly important to take note of when security attributes are printed. Please note that these delimiters may occur in fields that are not sub-delimited, and should not be interpreted as special.

Security attributes of registry keys have a complex structure which is outlined here. Each key will generally have an associated ACL (Access Control List), which is made up of ACEs (Access Control Entries). Each ACE is delimited by the secondary delimiter mentioned above, "|". The fields within an ACE are delimited by the third-level delimiter, ":", and consist of a SID, the ACE type (ALLOW, DENY, etc), a list of access rights, and a list of flags. The last two fields are delimited by the fourth-level delimiter " ". These final lists are simply human-readable interpretations of bits. The access rights abbreviations are listed below along with their Microsoft-assigned names:

       QRY_VAL           KEY_QUERY_VALUE
       SET_VAL           KEY_SET_VALUE
       NOTIFY            KEY_NOTIFY
       WOW64_64          KEY_WOW64_64KEY
       WOW64_32          KEY_WOW64_32KEY
       DELETE            DELETE
       R_CONT            READ_CONTROL
       W_DAC             WRITE_DAC
       W_OWNER           WRITE_OWNER
       SYNC              SYNCHRONIZE
       GEN_A             GENERIC_ALL
       GEN_X             GENERIC_EXECUTE
       GEN_W             GENERIC_WRITE
       GEN_R             GENERIC_READ

And the meaning of each flag is:

       OI        Object Inherit
       CI        Container Inherit
       NP        Non-Propagate
       IO        Inherit Only
       IA        Inherited ACE

Please see the following references for more information:


Note that some of the bits listed above have either not been allocated by Microsoft, or simply aren't documented. If any bits are set in the above two fields that aren't recognized, a hexidecimal representation of all of these mystery bits will be included in the output. For instance, if the lowest bit and third lowest bit were not recognized while being set, the number "0x5" would be included as an element in the list.

While the ACL/ACE output format is mostly stable at this point, minor changes may be introduced in future versions.


To read and print the contents of an entire system registry file:
         reglookup /mnt/win/c/WINNT/system32/config/system

To limit the output to just those entries under the Services key:

         reglookup -p /ControlSet002/Services /mnt/win/c/WINNT/system32/config/system

To limit the output to all registry values of type BINARY:

         reglookup -t BINARY /mnt/win/c/WINNT/system32/config/system

And to limit the output to BINARY values under the Services key:

         reglookup -t BINARY -p /ControlSet002/Services /mnt/win/c/WINNT/system32/config/system


This program has been smoke-tested against most current Windows target platforms, but a comprehensive test suite has not yet been developed. (Please report results to the development mailing list if you encounter any bugs. Sample registry files and/or patches are greatly appreciated.)

Verbose output is not working.

The SID conversions haven't been carefully checked for accuracy.

The MTIME conversions appear correctly produce the stored UTC timestamp. However, due to the periodicity of registry writes, and the complexity of the conversion, a small amount of error (on the order of seconds) may be possible. The documentation available online from Microsoft on this field is very poor.

Backslashes are currently considered special characters, to make parsing easier for automated tools. However, this causes paths to be difficult to read by mere mortals.

For more information on registry format details, see:


This program was initially based on editreg.c by Richard Sharpe. It has since been rewritten to use a modified version the regfio library written by Gerald Carter. Heavy modifications to the library and the original command line interface have been done by Timothy D. Morgan.

Please see source code for a full list of copyrights.


Please see the file "LICENSE" included with this software distribution.

This program 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 3 for more details.


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