Annotation of loncom/lcuseradd, revision 1.37

1.1       harris41    1: #!/usr/bin/perl
1.16      harris41    2: 
                      3: # The Learning Online Network with CAPA
1.1       harris41    4: #
1.16      harris41    5: # lcuseradd - LON-CAPA setuid script to coordinate all actions
                      6: #             with adding a user with filesystem privileges (e.g. author)
1.1       harris41    7: #
1.16      harris41    8: #
1.37    ! foxr        9: # $Id: lcuseradd,v 1.36 2005/04/07 22:27:52 albertel Exp $
1.16      harris41   10: ###
1.15      harris41   11: 
                     12: ###############################################################################
                     13: ##                                                                           ##
                     14: ## ORGANIZATION OF THIS PERL SCRIPT                                          ##
                     15: ##                                                                           ##
                     16: ## 1. Description of script                                                  ##
                     17: ## 2. Invoking script (standard input)                                       ##
                     18: ## 3. Example usage inside another piece of code                             ##
                     19: ## 4. Description of functions                                               ##
                     20: ## 5. Exit codes                                                             ##
                     21: ## 6. Initializations                                                        ##
                     22: ## 7. Make sure this process is running from user=www                        ##
                     23: ## 8. Start running script with www permissions                              ##
                     24: ## 9. Handle case of another lcpasswd process (locking)                      ##
                     25: ## 10. Error-check input, need 3 values (user name, password 1, password 2)  ##
                     26: ## 11. Start running script with root permissions                            ##
                     27: ## 12. Add user and make www a member of the user-specific group             ##
                     28: ## 13. Set password                                                          ##
                     29: ## 14. Make final modifications to the user directory                        ##
                     30: ## 15. Exit script (unlock)                                                  ##
                     31: ##                                                                           ##
                     32: ###############################################################################
1.1       harris41   33: 
                     34: use strict;
1.35      foxr       35: use File::Find;
                     36: 
1.1       harris41   37: 
1.15      harris41   38: # ------------------------------------------------------- Description of script
                     39: #
1.1       harris41   40: # This script is a setuid script that should
1.20      foxr       41: # be run by user 'www'.  It creates a /home/USERNAME directory.
1.15      harris41   42: # It adds a user to the unix system.
1.2       harris41   43: # Passwords are set with lcpasswd.
                     44: # www becomes a member of this user group.
1.1       harris41   45: 
1.15      harris41   46: # -------------- Invoking script (standard input versus command-line arguments)
1.26      foxr       47: #                Otherwise sensitive information will be available to ps-ers for
                     48: #                a small but exploitable time window.
1.15      harris41   49: #
                     50: # Standard input (STDIN) usage
1.1       harris41   51: # First line is USERNAME
                     52: # Second line is PASSWORD
1.3       harris41   53: # Third line is PASSWORD
1.26      foxr       54: # Fouth line is the name of a file to which an error code will be written.
                     55: #            If the fourth line is omitted, no error file will be written.
                     56: #            In either case, the program Exits with the code as its Exit status.
                     57: #            The error file will just be a single line containing an
                     58: #            error code.
                     59: #            
                     60: #  
1.15      harris41   61: #
                     62: # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]
                     63: # Yes, but be very careful here (don't pass shell commands)
                     64: # and this is only supported to allow perl-system calls.
                     65: #
1.7       harris41   66: # Valid passwords must consist of the
                     67: # ascii characters within the inclusive
                     68: # range of 0x20 (32) to 0x7E (126).
                     69: # These characters are:
                     70: # SPACE and
                     71: # !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO
                     72: # PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
1.15      harris41   73: #
1.7       harris41   74: # Valid user names must consist of ascii
                     75: # characters that are alphabetical characters
                     76: # (A-Z,a-z), numeric (0-9), or the underscore
                     77: # mark (_). (Essentially, the perl regex \w).
1.15      harris41   78: # User names must begin with an alphabetical character
                     79: # (A-Z,a-z).
1.7       harris41   80: 
1.15      harris41   81: # ---------------------------------- Example usage inside another piece of code
1.4       harris41   82: # Usage within code
                     83: #
1.26      foxr       84: # $Exitcode=
1.15      harris41   85: #      system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;
1.26      foxr       86: # print "uh-oh" if $Exitcode;
1.4       harris41   87: 
1.15      harris41   88: # ---------------------------------------------------- Description of functions
                     89: # enable_root_capability() : have setuid script run as root
                     90: # disable_root_capability() : have setuid script run as www
                     91: # try_to_lock() : make sure that another lcpasswd process isn't running
                     92: 
                     93: # ------------------------------------------------------------------ Exit codes
1.26      foxr       94: # These are the Exit codes.
1.13      harris41   95: # ( (0,"ok"),
                     96: # (1,"User ID mismatch.  This program must be run as user 'www'"),
1.15      harris41   97: # (2,"Error. This program needs 3 command-line arguments (username, ".
                     98: #    "password 1, password 2)."),
1.13      harris41   99: # (3,"Error. Three lines should be entered into standard input."),
1.15      harris41  100: # (4,"Error. Too many other simultaneous password change requests being ".
                    101: #    "made."),
1.13      harris41  102: # (5,"Error. User $username does not exist."),
                    103: # (6,"Error. Could not make www a member of the group \"$safeusername\"."),
                    104: # (7,"Error. Root was not successfully enabled.),
1.15      harris41  105: # (8,"Error. Cannot set password."),
1.13      harris41  106: # (9,"Error. The user name specified has invalid characters."),
                    107: # (10,"Error. A password entry had an invalid character."),
                    108: # (11,"Error. User already exists.),
1.15      harris41  109: # (12,"Error. Something went wrong with the addition of user ".
                    110: #     "\"$safeusername\"."),
1.13      harris41  111: # (13,"Error. Password mismatch."),
1.26      foxr      112: # (14, "Error filename is invalid")
1.4       harris41  113: 
1.15      harris41  114: # ------------------------------------------------------------- Initializations
1.1       harris41  115: # Security
1.15      harris41  116: $ENV{'PATH'}='/bin/:/usr/bin:/usr/local/sbin:/home/httpd/perl'; # Nullify path
                    117:                                                                 # information
1.16      harris41  118: delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}; # nullify potential taints
1.2       harris41  119: 
1.15      harris41  120: # Do not print error messages.
                    121: my $noprint=1;
                    122: 
1.26      foxr      123: #  Error file:
                    124: 
                    125: my $error_file;			# This is either the error file name or undef.
                    126: 
1.23      foxr      127: print "In lcuseradd\n" unless $noprint;
                    128: 
1.15      harris41  129: # ----------------------------- Make sure this process is running from user=www
                    130: my $wwwid=getpwnam('www');
                    131: &disable_root_capability;
                    132: if ($wwwid!=$>) {
                    133:     print("User ID mismatch.  This program must be run as user 'www'\n")
                    134: 	unless $noprint;
1.26      foxr      135:     &Exit(1);
1.4       harris41  136: }
1.15      harris41  137: 
                    138: # ----------------------------------- Start running script with www permissions
1.4       harris41  139: &disable_root_capability;
                    140: 
1.15      harris41  141: # --------------------------- Handle case of another lcpasswd process (locking)
1.4       harris41  142: unless (&try_to_lock("/tmp/lock_lcpasswd")) {
1.15      harris41  143:     print "Error. Too many other simultaneous password change requests being ".
                    144: 	"made.\n" unless $noprint;
1.26      foxr      145:     &Exit(4);
1.4       harris41  146: }
                    147: 
1.15      harris41  148: # ------- Error-check input, need 3 values (user name, password 1, password 2).
1.4       harris41  149: my @input;
1.26      foxr      150: if (@ARGV>=3) {
1.4       harris41  151:     @input=@ARGV;
1.28      foxr      152: } elsif (@ARGV) {
1.26      foxr      153:     print("Error. This program needs at least 3 command-line arguments (username, ".
                    154: 	  "password 1, password 2 [errorfile]).\n") unless $noprint;
1.4       harris41  155:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      156:     &Exit(2);
1.28      foxr      157: } else {
1.4       harris41  158:     @input=<>;
1.26      foxr      159:     if (@input < 3) {
                    160: 	print("Error. At least three lines should be entered into standard input.\n")
1.15      harris41  161: 	    unless $noprint;
1.4       harris41  162: 	unlink('/tmp/lock_lcpasswd');
1.26      foxr      163: 	&Exit(3);
1.4       harris41  164:     }
1.19      harris41  165:     foreach (@input) {chomp;}
1.4       harris41  166: }
                    167: 
1.26      foxr      168: my ($username,$password1,$password2, $error_file)=@input;
1.23      foxr      169: print "Username = ".$username."\n" unless $noprint;
1.4       harris41  170: $username=~/^(\w+)$/;
1.22      foxr      171: print "Username after substitution - ".$username unless $noprint;
1.4       harris41  172: my $safeusername=$1;
1.23      foxr      173: print "Safe username = $safeusername \n" unless $noprint;
1.22      foxr      174: 
1.15      harris41  175: if (($username ne $safeusername) or ($safeusername!~/^[A-Za-z]/)) {
1.22      foxr      176:     print "Error. The user name specified $username $safeusername  has invalid characters.\n"
1.15      harris41  177: 	unless $noprint;
1.8       harris41  178:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      179:     &Exit(9);
1.8       harris41  180: }
                    181: my $pbad=0;
1.19      harris41  182: foreach (split(//,$password1)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
                    183: foreach (split(//,$password2)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
1.8       harris41  184: if ($pbad) {
1.26      foxr      185:     print "Error. A password entry had an invalid character.\n" unless $noprint;
1.8       harris41  186:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      187:     &Exit(10);
1.8       harris41  188: }
1.5       harris41  189: 
1.26      foxr      190: #
                    191: #   Safe the filename.  For our case, it must only have alpha, numeric, period
                    192: #   and path sparators..
                    193: #
                    194: 
                    195: print "Error file is $error_file \n" unless $noprint;
                    196: 
                    197: if($error_file) {
                    198:     if($error_file =~ /^([(\w)(\d)\.\/]+)$/) {
                    199: 	print "Error file matched pattern $error_file : $1\n" unless $noprint;
                    200: 	my $safe_error_file = $1;	# Untainted I think.
                    201: 	print "Error file after transform $safe_error_file\n"
                    202: 	    unless $noprint;
                    203: 	if($error_file == $safe_error_file) {
                    204: 	    $error_file = $safe_error_file; # untainted error_file.
                    205: 	} else {
                    206: 	    $error_file ="";
                    207: 	    print "Invalid error filename\n" unless $noprint;
                    208: 	    Exit(14);
                    209: 	}
                    210: 
1.28      foxr      211:     } else {
1.26      foxr      212: 	$error_file="";
                    213: 	print "Invalid error filename\n" unless $noprint;
                    214: 	Exit(14);
                    215:     }
                    216: }
                    217: 
                    218: 
1.31      foxr      219: # -- Only add the user if they are >not< in /etc/passwd.
                    220: #    Used to look for the ability to create a new directory for the
                    221: #    user, however that disallows authentication changes from i
                    222: #    internal->fs.. so just check the passwd file instead.
                    223: #
1.34      foxr      224: my $not_found = system("cut -d: -f1 /etc/passwd | grep -q \"^$safeusername\$\" ");
1.31      foxr      225: if (!$not_found) {
                    226:     print "Error user already exists\n" unless $noprint;
1.7       harris41  227:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      228:     &Exit(11);
1.7       harris41  229: }
                    230: 
1.31      foxr      231: 
                    232: 
1.15      harris41  233: # -- Only add user if the two password arguments match.
1.23      foxr      234: 
1.5       harris41  235: if ($password1 ne $password2) {
1.6       harris41  236:     print "Error. Password mismatch.\n" unless $noprint;
1.5       harris41  237:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      238:     &Exit(13);
1.5       harris41  239: }
1.23      foxr      240: print "enabling root\n" unless $noprint;
1.15      harris41  241: # ---------------------------------- Start running script with root permissions
1.4       harris41  242: &enable_root_capability;
                    243: 
1.15      harris41  244: # ------------------- Add user and make www a member of the user-specific group
                    245: # -- Add user
1.23      foxr      246: 
                    247: print "adding user: $safeusername \n" unless $noprint;
                    248: my $status = system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername);
                    249: if ($status) {
1.15      harris41  250:     print "Error.  Something went wrong with the addition of user ".
                    251: 	  "\"$safeusername\".\n" unless $noprint;
1.37    ! foxr      252:     print "Final status of useradd = $status\n";
1.4       harris41  253:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      254:     &Exit(12);
1.4       harris41  255: }
1.36      albertel  256: my ($dmy1, $dmy2, $uid, $gid) = getpwnam($safeusername);
                    257: my ($group) = getgrgid($gid);
                    258: if (! $group) {
                    259:     print "Error. The primary group of user \"$safeusername\" could not be".
                    260:           "determined.\n" unless $noprint;
                    261:     system("/usr/sbin/userdel -r $safeusername");
                    262:     unlink('/tmp/lock_lcpasswd');
                    263:     &Exit(12);
                    264: }
                    265: if ($group != $safeusername) {
                    266:    $status = system("/usr/sbin/groupadd -g $uid $safeusername");
                    267:    if (! $status) {
                    268:       $status = system("/usr/sbin/usermod -g $uid $safeusername");
                    269:       if ($status) {
                    270:          system("/usr/sbin/groupdel $safeusername");
                    271:       }
                    272:    }
                    273:    if ($status) {
                    274:       print "Error.  Something went wrong with the addition of user ".
                    275:             "\"$safeusername\".\n" unless $noprint;
                    276:       system("/usr/sbin/userdel -r $safeusername");
                    277:       unlink('/tmp/lock_lcpasswd');
                    278:       &Exit(12);
                    279:    }
                    280: }
                    281: 
1.23      foxr      282: print "Done adding user\n" unless $noprint;
1.7       harris41  283: # Make www a member of that user group.
1.26      foxr      284: my $groups=`/usr/bin/groups www` or &Exit(6);
1.27      albertel  285: # untaint
1.29      albertel  286: my ($safegroups)=($groups=~/:\s*([\s\w]+)/);
1.27      albertel  287: $groups=$safegroups;
1.17      harris41  288: chomp $groups; $groups=~s/^\S+\s+\:\s+//;
                    289: my @grouplist=split(/\s+/,$groups);
                    290: my @ugrouplist=grep {!/www|$safeusername/} @grouplist;
                    291: my $gl=join(',',(@ugrouplist,$safeusername));
1.23      foxr      292: print "Putting user in its own group\n" unless $noprint;
1.17      harris41  293: if (system('/usr/sbin/usermod','-G',$gl,'www')) {
1.15      harris41  294:     print "Error. Could not make www a member of the group ".
                    295: 	  "\"$safeusername\".\n" unless $noprint;
1.5       harris41  296:     unlink('/tmp/lock_lcpasswd');
1.26      foxr      297:     &Exit(6);
1.5       harris41  298: }
                    299: 
1.15      harris41  300: # ---------------------------------------------------------------- Set password
                    301: # Set password with lcpasswd (which creates smbpasswd entry).
1.2       harris41  302: 
1.15      harris41  303: unlink('/tmp/lock_lcpasswd');
                    304: &disable_root_capability;
1.16      harris41  305: ($>,$<)=($wwwid,$wwwid);
1.23      foxr      306: print "Opening lcpasswd pipeline\n" unless $noprint;
1.16      harris41  307: open OUT,"|/home/httpd/perl/lcpasswd";
1.15      harris41  308: print OUT $safeusername;
                    309: print OUT "\n";
                    310: print OUT $password1;
                    311: print OUT "\n";
                    312: print OUT $password1;
                    313: print OUT "\n";
                    314: close OUT;
                    315: if ($?) {
1.26      foxr      316:     print "abnormal Exit from close lcpasswd\n" unless $noprint;
                    317:     &Exit(8);
1.8       harris41  318: }
1.18      harris41  319: ($>,$<)=($wwwid,0);
1.15      harris41  320: &enable_root_capability;
1.8       harris41  321: 
1.20      foxr      322: # -- Don't add public_html... that can be added either by the user
                    323: #    or by lchtmldir when the user is granted an authorship role.
                    324: 
1.15      harris41  325: # ------------------------------ Make final modifications to the user directory
                    326: # -- Add a public_html file with a stand-in index.html file
1.8       harris41  327: 
1.21      foxr      328:  system('/bin/chmod','-R','0660',"/home/$safeusername");
                    329: system('/bin/chmod','0710',"/home/$safeusername");
                    330: mkdir "/home/$safeusername/public_html",0755;
                    331: open OUT,">/home/$safeusername/public_html/index.html";
                    332: print OUT<<END;
                    333: <html>
                    334: <head>
                    335: <title>$safeusername</title>
                    336: </head>
                    337: <body>
1.24      www       338: <h1>Construction Space</h1>
                    339: <h3>$safeusername</h3>
1.21      foxr      340: </body>
                    341: </html>
                    342: END
                    343: close OUT;
1.35      foxr      344: 
1.32      foxr      345: #
                    346: #   In order to allow the loncapa daemons appropriate access
                    347: #   to public_html, Top level and public_html directories should
1.34      foxr      348: #   be owned by safeusername:safeusername as should the smaple index.html..
1.24      www       349: print "lcuseradd ownership\n" unless $noprint;
1.32      foxr      350: system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername"); # First set std ownership on everything.
1.35      foxr      351: &set_public_html_permissions("/home/$safeusername/public_html");
1.33      foxr      352: #  system('/bin/chown',"$safeusername:www","/home/$safeusername");	# Now adust top level...
                    353: #  system('/bin/chown','-R',"$safeusername:www","/home/$safeusername/public_html"); # And web dir.
1.24      www       354: # ---------------------------------------------------- Gracefull Apache Restart
                    355: if (-e '/var/run/httpd.pid') {
                    356:     print "lcuseradd Apache restart\n" unless $noprint;
                    357:     open(PID,'/var/run/httpd.pid');
                    358:     my $pid=<PID>;
                    359:     close(PID);
1.35      foxr      360:     my  $pid=~ /(\D+)/;
                    361:     my $safepid = $1;
1.24      www       362:     if ($pid) {
1.27      albertel  363: 	system('kill','-USR1',"$safepid");
1.24      www       364:     }
                    365: }
1.15      harris41  366: # -------------------------------------------------------- Exit script
1.26      foxr      367: print "lcuseradd Exiting\n" unless $noprint;
1.8       harris41  368: &disable_root_capability;
1.26      foxr      369: &Exit(0);
1.1       harris41  370: 
1.15      harris41  371: # ---------------------------------------------- Have setuid script run as root
1.5       harris41  372: sub enable_root_capability {
                    373:     if ($wwwid==$>) {
1.23      foxr      374: 	($<,$>)=($>,0);
                    375: 	($(,$))=($),0);
1.28      foxr      376:     } else {
1.5       harris41  377: 	# root capability is already enabled
                    378:     }
                    379:     return $>;
                    380: }
                    381: 
1.15      harris41  382: # ----------------------------------------------- Have setuid script run as www
1.5       harris41  383: sub disable_root_capability {
                    384:     if ($wwwid==$<) {
                    385: 	($<,$>)=($>,$<);
                    386: 	($(,$))=($),$();
1.28      foxr      387:     } else {
1.5       harris41  388: 	# root capability is already disabled
                    389:     }
                    390: }
                    391: 
1.15      harris41  392: # ----------------------- Make sure that another lcpasswd process isn't running
1.5       harris41  393: sub try_to_lock {
                    394:     my ($lockfile)=@_;
                    395:     my $currentpid;
                    396:     my $lastpid;
                    397:     # Do not manipulate lock file as root
                    398:     if ($>==0) {
                    399: 	return 0;
                    400:     }
                    401:     # Try to generate lock file.
                    402:     # Wait 3 seconds.  If same process id is in
                    403:     # lock file, then assume lock file is stale, and
                    404:     # go ahead.  If process id's fluctuate, try
                    405:     # for a maximum of 10 times.
                    406:     for (0..10) {
                    407: 	if (-e $lockfile) {
                    408: 	    open(LOCK,"<$lockfile");
                    409: 	    $currentpid=<LOCK>;
                    410: 	    close LOCK;
                    411: 	    if ($currentpid==$lastpid) {
                    412: 		last;
                    413: 	    }
                    414: 	    sleep 3;
                    415: 	    $lastpid=$currentpid;
1.28      foxr      416: 	} else {
1.5       harris41  417: 	    last;
                    418: 	}
                    419: 	if ($_==10) {
                    420: 	    return 0;
                    421: 	}
                    422:     }
                    423:     open(LOCK,">$lockfile");
                    424:     print LOCK $$;
                    425:     close LOCK;
                    426:     return 1;
                    427: }
1.35      foxr      428: #    Called by File::Find::find for each file examined.
                    429: #
                    430: #     Untaint the file and, if it is a directory,
                    431: #     chmod it to 02770
                    432: #
                    433: sub set_permission {
                    434:     $File::Find::name =~ /^(.*)$/;
                    435:     my $safe_name = $1;		# Untainted filename...
                    436:     
                    437:     print "$safe_name" unless $noprint;
                    438:     if(-d $safe_name) {
                    439: 	print " - directory" unless $noprint;
                    440: 	chmod(02770, $safe_name);
                    441:     }
                    442:     print "\n" unless $noprint;
                    443: 
                    444: }
                    445: #
                    446: #    Set up the correct permissions for all files in the 
                    447: #    user's public htmldir. We just do a chmod -R 0660 ... for
                    448: #    the ordinary files.  The we use File::Find
                    449: #    to pop through the directory tree changing directories only
                    450: #    to 02770:
                    451: #
                    452: sub set_public_html_permissions {
                    453:     my ($topdir) = @_;
                    454: 
                    455:     #   Set the top level dir permissions (I'm not sure if find 
                    456:     #   will enumerate it specifically), correctly and all
                    457:     #   files and dirs to the 'ordinary' file permissions:
                    458: 
                    459:     system("chmod -R 0660 $topdir");
                    460:     chmod(02770, $topdir);
                    461: 
                    462:     #  Now use find to locate all directories under $topdir
                    463:     #  and set their modes to 02770...
                    464:     #
                    465:     print "Find file\n " unless $noprint;
                    466:     File::Find::find({"untaint"         => 1,
                    467: 		      "untaint_pattern" => qr(/^(.*)$/),
                    468: 		      "untaint_skip"    => 1,
                    469: 		      "no_chdir"         => 1,
                    470: 		      "wanted"          => \&set_permission }, "$topdir");
                    471: 
                    472: 
                    473: }
                    474: 
1.26      foxr      475: #-------------------------- Exit...
                    476: #
                    477: #   Write the file if the error_file is defined.  Regardless
                    478: #   Exit with the status code.
                    479: #
                    480: sub Exit {
                    481:     my ($code) = @_;		# Status code.
                    482: 
1.37    ! foxr      483:     # TODO: Ensure the error file is owned/deletable by www:www:
        !           484: 
        !           485:     &disable_root_capability();	# We run unprivileged to write the error file.
        !           486: 
1.26      foxr      487:     print "Exiting with status $code error file is $error_file\n" unless $noprint;
                    488:     if($error_file) {
                    489: 	open(FH, ">$error_file");
                    490: 	print FH  "$code\n";
                    491: 	close(FH);
                    492:     }
                    493:     exit $code;
                    494: }
1.16      harris41  495: 
                    496: =head1 NAME
                    497: 
                    498: lcuseradd - LON-CAPA setuid script to coordinate all actions
                    499:             with adding a user with filesystem privileges (e.g. author)
                    500: 
                    501: =head1 DESCRIPTION
                    502: 
                    503: lcuseradd - LON-CAPA setuid script to coordinate all actions
                    504:             with adding a user with filesystem privileges (e.g. author)
                    505: 
                    506: =head1 README
                    507: 
                    508: lcuseradd - LON-CAPA setuid script to coordinate all actions
                    509:             with adding a user with filesystem privileges (e.g. author)
                    510: 
                    511: =head1 PREREQUISITES
                    512: 
                    513: =head1 COREQUISITES
                    514: 
                    515: =pod OSNAMES
                    516: 
                    517: linux
                    518: 
                    519: =pod SCRIPT CATEGORIES
                    520: 
                    521: LONCAPA/Administrative
                    522: 
                    523: =cut

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