Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

UserId checker

by brick (Sexton)
on Jun 10, 2000 at 04:58 UTC ( #17478=sourcecode: print w/ replies, xml ) Need Help??
Category: Utility Scripts
Author/Contact Info brick: Ben McFarland
Description: This program is meant to munge through N passwd files and check for logins with multiple UIDs, UIDs with multiple logins, and logins with a UID of zero (0) that are not root.
#!/usr/local/bin/perl -w

#Password file checker written by: Benjamin A. McFarland
#Purpose: This program is  meant to munge through N passwd files and
#         check for logins with multiple UIDs, UIDs with multiple
#         logins, and logins with a UID of zero (0) that are not root.
#         Logins with multiple UIDs are listed in the output file:
#         "multi_uids.dat" as are users with an UID of zero (0). UIDs
#         owned by more than one login are listed in "multi_logins.dat
#         All other users who pass these criteria are listed in the
#         file: "goodusr.dat"

$length = scalar(@ARGV);
$SYSLIMIT = 100;

#We set this constant to allow for system logins. The constant allows 
#SAs to alter it here if they decide to allow system logins to have UI
#higher or lower.

if($length == 0)
   print STDOUT "passchk requires a source password file! USAGE:\n\tus
+er_name>passchk /path/to/your/passwd\n";
   exit 0;

#The above conditional confirms that the script is run with at least o
#source file for data, else it exits with failure.

    open(LOGPUT, "> "."multi_uids.dat");
    open(UIDPUT, "> "."multi_logins.dat");

#Then the log files for the script are opened for writing. Old files a
#clobbered since we're looking for the most recent data, and I didn't 
#that the old data was pertinent.

#So, now we cycle through the  number of source files given in the ARG

for($i = 0; $i <= $length; $i++)
    open(CURFILE, "$ARGV[$i]");
    while($input = <CURFILE>)

#As long as we're getting data from the Current datafile, read it into
#the variable $input.

    @dataf = split(/:/,$input);
#we break the data at the colons and place it into an array.

    if(($dataf[2] == 0)&&($dataf[0] ne "root"))
       print LOGPUT "**\n*WARNING* User: $dataf[0] has a UID of $dataf

#The above loop checks right away for any multiple logins with a UID o

    if((!defined $loghash{$dataf[0]})&&($dataf[2] > $SYSLIMIT))
      $loghash{$dataf[0]} = $dataf[2];
      $badhash{$dataf[0]} = 0; 
      if(!defined $srcfile{$dataf[0]})
         $srcfile{$dataf[0]} = $ARGV[$i];

#Now we check for values that haven't been entered into our logging
#arrays and that have a UID of larger than the constant set at the
#beginning of the script. If so, we log them, and set the source array
#This is done in the conditionals above and below.

     if((!defined $uidhash{$dataf[2]})&&($dataf[2] > $SYSLIMIT))
        $uidhash{$dataf[2]} = $dataf[0];
        $badhash{$dataf[2]} = 0;
        if(!defined $srcfile{$dataf[2]})
           $srcfile{$dataf[2]} = $ARGV[$i];

#Now we check to see if the UID doesn't match the one previously set
#with this login and that the UID is above our system constant. If not
#we log it into the appropriate file and set the bad flag.

      if(($loghash{$dataf[0]} ne $dataf[2])&&($dataf[2] > $SYSLIMIT))
         print LOGPUT "$dataf[0] had multiple UIDs $loghash{$dataf[0]}
+ from file: $srcfile{$dataf[0]}\n\tand $dataf[2] from file:$ARGV[$i]\
         $badlist[$dataf[0]} = 1;

#Same conditional as above, but this time we're looking to see that th
#login is the same one set to this UID, the opposite condition of the
#previous conditional. If not, then we set the bad flag.

       if(($uidhash{$dataf[2]} ne $dataf[0])&&($dataf[2] > $SYSLIMIT))
          print  UIDPUT "UID $dataf[2] is being used by both:\n$uidhas
+h{$dataf[2]} from file: $srcfile{$dataf[2]} and\n$dataf[0] from file:
+ $ARGV[$i]\n";
          $badlist{dataf[2]} = 1;

#We're done with the current file, close it before we open a new one.

#At this point,  we've completed all of our source file munging, and
#should have compiled all the valid and invalid logins and UIDs. So,
#we open up our good data file, pull up the keys, sort them alphabetic
#check that they haven't ended up in our bad list, and print them out.

    open(GOODFILE, "> "."goodusr.dat");
    foreach $key (sort keys(%loghash))
       if(($badlist{$key} != 1) && ($badlist{$loghash{$key}} != 1))
          print GOODFILE "$key is using only valid UID $loghash{$key},
+ from:\n$srcfile{$key}\n";

#We're done with this bad boy, so we shut all our files like a good

Comment on UserId checker
Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: sourcecode [id://17478]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others browsing the Monastery: (5)
As of 2016-05-05 04:34 GMT
Find Nodes?
    Voting Booth?