frecover Post: 314

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Top Forums UNIX for Dummies Questions & Answers frecover Post 314 by Neo on Wednesday 22nd of November 2000 01:17:47 AM

11-22-2000

Administrator

Thanks for the man page pointer. Here are my current thoughts of what I would do if this was my problem and some background discussion.

First of all, in my years of HPUX experience, I always tried to avoid using SAM. SAM does many commands when you execute a function and it is hard to debug errors, as you are discovering.

Back away from SAM, decide what you are going to do, use the HP documentation and man pages and do it, step-by-step without SAM in between you and the environment. This has always been my method-of-operating in an HPUX environment. That is not to say that SAM is 'not good' because I use it to add users, groups and other less complex tasks. However,
for non-trivial tasks or tasks that are giving errors, I immediately move from SAM to the command line.

Now, assume you are at the command line. Take a look at the files and their permissions, write them down, etc. Start your reconfiguration step-by-step. If that does not work and you get errors, for example with frecover(); I would use a system call tracing utility to find out what is the exact HPUX system call returning the error and the arguments being passed to the system call. Sometimes the return codes of the systems call are much more informative that the text messages in the console. You will have to read the detailed man pages of the system calls to get this information. Somethings you will have to go into the header files in the associated system libs and look for the #defines in the right includes to get the next level of details.

I don't recall the name of the HPUX system call trace utility, something like ptrace() or strace() or something like that. There is one however, and learning to use it will become one of your greatest sysadmin debugging tools.

However, in many cases, just executing the task from the command line, step-by-step, in a controlled manner, with lead to a discovery of the problem. It may not be necessary to go a level deeper into system call tracing; but you will surely learn a lot about your environment getting out from under SAM and into the nuts-and-bolts of the task at hand.

Neo

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LEARN ABOUT DEBIAN

chntpw

CHNTPW(8)						      System Manager's Manual							 CHNTPW(8)

NAME

       chntpw - utility to overwrite Windows NT/2000 SAM passwords

SYNOPSIS

       chntpw [options] <samfile> [systemfile] [securityfile] [otherreghive] [...]

DESCRIPTION

       This  manual page documents briefly the chntpw command.	This manual page was written for the Debian distribution because the original pro-
       gram does not have a manual page.

       chntpw is a utility to view some information and change user passwords in a Windows NT/2000 SAM userdatabase file, usually located at WIN-
       DOWSsystem32configSAM  on the Windows file system. It is not necessary to know the old passwords to reset them.  In addition it contains
       a simple registry editor (same size data writes) and hex-editor with which the information contained in a registry file can be browsed  and
       modified.

OPTIONS

       -h     Show summary of options.

       -u username
	      Username to change. Default is Administrator

       -l     List all users in the SAM database.

       -i     Interactive: list all users (as per -l) and then ask for the user to change.

       -e     Registry editor with limited capabilities.

       -d     Use buffer debugger.

       -t     Show hexdumps of structs/segments (deprecated debug function).

EXAMPLES

       ntfs-3g /dev/sda1 /media/win ; cd /media/win/WINDOWS/system32/config/
	      Mount the Windows file system and enters the directory WINDOWSsystem32config where Windows stores the SAM database.

       chntpw SAM system
	      Opens  registry  hives  SAM  and system and change administrator account. This will work even if the name has been changed or it has
	      been localized (since different language versions of NT use different administrator names).

       chntpw -l SAM
	      Lists the users defined in the SAM registry file.

       chntpw -u jabbathehutt SAM
	      Prompts for password for jabbathehutt and changes it in the SAM registry file, if found (otherwise do nothing).

SEE ALSO

       If you are looking for an automated procedure for password recovery, you might look at the bootdisks provided by  the  upstream	author	at
       http://pogostick.net/~pnh/ntpasswd/
       There is more information on how this program works available at /usr/share/doc/chntpw registry works.

AUTHOR

       This manual page was written by Javier Fernandez-Sanguino <jfs@computer.org>, for the Debian GNU/Linux system (but may be used by others).

								  13th March 2010							 CHNTPW(8)