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Special Forums Cybersecurity UNIX files timestamping - Need experts opinion as testimonial Post 302896132 by docflied on Friday 4th of April 2014 01:51:47 PM
Old 04-04-2014
UNIX files timestamping - Need experts opinion as testimonial

Hi
I am requesting your help to obtain opinions and testimonials in order to be be able to make my own opinion since I am definetly not a unix expert.

Say we have a UNIX server.
On this server there is a specific directory let us call it "DIR"
A security incident have been reported related to this server.
Expert in forensics analyzed it and wrote this (modified a bit for confidentiality reasons)

Files : File1 to File14
"The above files were known to have been present in the directory. File system timestamps indicate that they were last accessed arround HH:MM on D Month Year and deleted around HH:MM on D Month Year. Investigators have attempted carving these files from free space on the system to determine their contents, however the files were unrecoverable. Some of there files may have been present for legitimate purposes."

Files : File15 to File20
"Due to the files' metadata having been overwritten, the initial date of their presence and their deletion date are unknown."

Since all files (File1 to File20) are supposed to have been present in the same directory (DIR) is it possible to succeed in identifying access and deletion timestamp of only a subset? Also File1 to File14 are assumed to be created and deleted earliest than File15 to File20 (fwe month to several years for some files)

Please give me your opinion only if you master unix file system and how files timestamps are managed.
The many the best.

Any way thank you very much for your time and help.
 

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ypmake(8yp)															       ypmake(8yp)

Name
       ypmake - rebuild yellow pages (YP) database using the make command

Syntax
       cd /etc/yp
       make [ options ] [ map ]

Description
       The  command  uses  the to build the yellow pages database.  With no arguments, creates databases for any YP maps that are out-of-date, and
       then executes to notify slave databases that there has been a change.  It is important to note that the command should only be executed	at
       a  YP  master  server  machine.	If it is executed from either a slave server or a pure YP client machine, the created changes will only be
       overwritten when the next YP master server machine update, using is performed.

       The options argument can be used to change the default values of three special variables used by DIR , NOPUSH , and DOM .  The DIR variable
       instructs  to  give  the  directory  of the source files.  The NOPUSH variable, which when non-null, inhibits updating of the new data base
       files using the function.  The DOM variable, instructs to construct a domain other than the master's default domain.  The default  for  DIR
       is  and	the default for NOPUSH is the null string.  To change the default values of these special variables, an options argument format of
       special_variable = value is used.  See the Examples section for an example.

       The map argument supplied on the command line instructs to update only the specified map.  The specified maps are those	located  at  where
       {domain}  is  the  yellow  pages domain name.  Some typical entries for the map argument are passwd, hosts, and networks.  Typing causes to
       create and update the YP password database, if it is out of date.  The command updates the password data base using Therefore, typing
       make host
       or
       make networks
       causes to create and to update the host and network files, and respectively.

       See and for an overview of the yellow pages.

Examples
       This example causes to create a password yellow pages map for the domain instead of for the default domain:
       make DOM=NewDomain passwd

See Also
       make(1), makedbm(8yp), ypserv(8yp), yppush(8yp)

																       ypmake(8yp)
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