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Diff for /loncom/Attic/lcuseradd between versions 1.17 and 1.29

version 1.17, 2001/11/15 22:38:12 version 1.29, 2004/09/02 18:59:24
Line 5 Line 5
 # lcuseradd - LON-CAPA setuid script to coordinate all actions  # lcuseradd - LON-CAPA setuid script to coordinate all actions
 #             with adding a user with filesystem privileges (e.g. author)  #             with adding a user with filesystem privileges (e.g. author)
 #  #
 # YEAR=2000  
 # 10/27,10/29,10/30 Scott Harrison  
 # YEAR=2001  
 # 10/21,11/13,11/15 Scott Harrison  
 #  #
 # $Id$  # $Id$
 ###  ###
Line 40  use strict; Line 36  use strict;
 # ------------------------------------------------------- Description of script  # ------------------------------------------------------- Description of script
 #  #
 # This script is a setuid script that should  # This script is a setuid script that should
 # be run by user 'www'.  It creates a /home/USERNAME directory  # be run by user 'www'.  It creates a /home/USERNAME directory.
 # as well as a /home/USERNAME/public_html directory.  
 # It adds a user to the unix system.  # It adds a user to the unix system.
 # Passwords are set with lcpasswd.  # Passwords are set with lcpasswd.
 # www becomes a member of this user group.  # www becomes a member of this user group.
   
 # -------------- Invoking script (standard input versus command-line arguments)  # -------------- Invoking script (standard input versus command-line arguments)
   #                Otherwise sensitive information will be available to ps-ers for
   #                a small but exploitable time window.
 #  #
 # Standard input (STDIN) usage  # Standard input (STDIN) usage
 # First line is USERNAME  # First line is USERNAME
 # Second line is PASSWORD  # Second line is PASSWORD
 # Third line is PASSWORD  # Third line is PASSWORD
   # Fouth line is the name of a file to which an error code will be written.
   #            If the fourth line is omitted, no error file will be written.
   #            In either case, the program Exits with the code as its Exit status.
   #            The error file will just be a single line containing an
   #            error code.
   #            
   #  
 #  #
 # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]  # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]
 # Yes, but be very careful here (don't pass shell commands)  # Yes, but be very careful here (don't pass shell commands)
Line 75  use strict; Line 79  use strict;
 # ---------------------------------- Example usage inside another piece of code  # ---------------------------------- Example usage inside another piece of code
 # Usage within code  # Usage within code
 #  #
 # $exitcode=  # $Exitcode=
 #      system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;  #      system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;
 # print "uh-oh" if $exitcode;  # print "uh-oh" if $Exitcode;
   
 # ---------------------------------------------------- Description of functions  # ---------------------------------------------------- Description of functions
 # enable_root_capability() : have setuid script run as root  # enable_root_capability() : have setuid script run as root
Line 85  use strict; Line 89  use strict;
 # try_to_lock() : make sure that another lcpasswd process isn't running  # try_to_lock() : make sure that another lcpasswd process isn't running
   
 # ------------------------------------------------------------------ Exit codes  # ------------------------------------------------------------------ Exit codes
 # These are the exit codes.  # These are the Exit codes.
 # ( (0,"ok"),  # ( (0,"ok"),
 # (1,"User ID mismatch.  This program must be run as user 'www'"),  # (1,"User ID mismatch.  This program must be run as user 'www'"),
 # (2,"Error. This program needs 3 command-line arguments (username, ".  # (2,"Error. This program needs 3 command-line arguments (username, ".
Line 103  use strict; Line 107  use strict;
 # (12,"Error. Something went wrong with the addition of user ".  # (12,"Error. Something went wrong with the addition of user ".
 #     "\"$safeusername\"."),  #     "\"$safeusername\"."),
 # (13,"Error. Password mismatch."),  # (13,"Error. Password mismatch."),
   # (14, "Error filename is invalid")
   
 # ------------------------------------------------------------- Initializations  # ------------------------------------------------------------- Initializations
 # Security  # Security
Line 113  delete @ENV{qw(IFS CDPATH ENV BASH_ENV)} Line 118  delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}
 # Do not print error messages.  # Do not print error messages.
 my $noprint=1;  my $noprint=1;
   
   #  Error file:
   
   my $error_file; # This is either the error file name or undef.
   
   print "In lcuseradd\n" unless $noprint;
   
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 &disable_root_capability;  &disable_root_capability;
 if ($wwwid!=$>) {  if ($wwwid!=$>) {
     print("User ID mismatch.  This program must be run as user 'www'\n")      print("User ID mismatch.  This program must be run as user 'www'\n")
  unless $noprint;   unless $noprint;
     exit 1;      &Exit(1);
 }  }
   
 # ----------------------------------- Start running script with www permissions  # ----------------------------------- Start running script with www permissions
Line 129  if ($wwwid!=$>) { Line 140  if ($wwwid!=$>) {
 unless (&try_to_lock("/tmp/lock_lcpasswd")) {  unless (&try_to_lock("/tmp/lock_lcpasswd")) {
     print "Error. Too many other simultaneous password change requests being ".      print "Error. Too many other simultaneous password change requests being ".
  "made.\n" unless $noprint;   "made.\n" unless $noprint;
     exit 4;      &Exit(4);
 }  }
   
 # ------- Error-check input, need 3 values (user name, password 1, password 2).  # ------- Error-check input, need 3 values (user name, password 1, password 2).
 my @input;  my @input;
 if (@ARGV==3) {  if (@ARGV>=3) {
     @input=@ARGV;      @input=@ARGV;
 }  } elsif (@ARGV) {
 elsif (@ARGV) {      print("Error. This program needs at least 3 command-line arguments (username, ".
     print("Error. This program needs 3 command-line arguments (username, ".    "password 1, password 2 [errorfile]).\n") unless $noprint;
   "password 1, password 2).\n") unless $noprint;  
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 2;      &Exit(2);
 }  } else {
 else {  
     @input=<>;      @input=<>;
     if (@input!=3) {      if (@input < 3) {
  print("Error. Three lines should be entered into standard input.\n")   print("Error. At least three lines should be entered into standard input.\n")
     unless $noprint;      unless $noprint;
  unlink('/tmp/lock_lcpasswd');   unlink('/tmp/lock_lcpasswd');
  exit 3;   &Exit(3);
     }      }
     map {chomp} @input;      foreach (@input) {chomp;}
 }  }
   
 my ($username,$password1,$password2)=@input;  my ($username,$password1,$password2, $error_file)=@input;
   print "Username = ".$username."\n" unless $noprint;
 $username=~/^(\w+)$/;  $username=~/^(\w+)$/;
   print "Username after substitution - ".$username unless $noprint;
 my $safeusername=$1;  my $safeusername=$1;
   print "Safe username = $safeusername \n" unless $noprint;
   
 if (($username ne $safeusername) or ($safeusername!~/^[A-Za-z]/)) {  if (($username ne $safeusername) or ($safeusername!~/^[A-Za-z]/)) {
     print "Error. The user name specified has invalid characters.\n"      print "Error. The user name specified $username $safeusername  has invalid characters.\n"
  unless $noprint;   unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 9;      &Exit(9);
 }  }
 my $pbad=0;  my $pbad=0;
 map {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}} (split(//,$password1));  foreach (split(//,$password1)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
 map {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}} (split(//,$password2));  foreach (split(//,$password2)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
 if ($pbad) {  if ($pbad) {
     print "Error. A password entry had an invalid character.\n";      print "Error. A password entry had an invalid character.\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 10;      &Exit(10);
 }  }
   
   #
   #   Safe the filename.  For our case, it must only have alpha, numeric, period
   #   and path sparators..
   #
   
   print "Error file is $error_file \n" unless $noprint;
   
   if($error_file) {
       if($error_file =~ /^([(\w)(\d)\.\/]+)$/) {
    print "Error file matched pattern $error_file : $1\n" unless $noprint;
    my $safe_error_file = $1; # Untainted I think.
    print "Error file after transform $safe_error_file\n"
       unless $noprint;
    if($error_file == $safe_error_file) {
       $error_file = $safe_error_file; # untainted error_file.
    } else {
       $error_file ="";
       print "Invalid error filename\n" unless $noprint;
       Exit(14);
    }
   
       } else {
    $error_file="";
    print "Invalid error filename\n" unless $noprint;
    Exit(14);
       }
   }
   
   
 # -- Only add user if we can create a brand new home directory (/home/username)  # -- Only add user if we can create a brand new home directory (/home/username)
 if (-e "/home/$safeusername") {  if (-e "/home/$safeusername") {
     print "Error. User already exists.\n" unless $noprint;      print "Error. User already exists.\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 11;      &Exit(11);
 }  }
   
 # -- Only add user if the two password arguments match.  # -- Only add user if the two password arguments match.
   
 if ($password1 ne $password2) {  if ($password1 ne $password2) {
     print "Error. Password mismatch.\n" unless $noprint;      print "Error. Password mismatch.\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 13;      &Exit(13);
 }  }
   print "enabling root\n" unless $noprint;
 # ---------------------------------- Start running script with root permissions  # ---------------------------------- Start running script with root permissions
 &enable_root_capability;  &enable_root_capability;
   
 # ------------------- Add user and make www a member of the user-specific group  # ------------------- Add user and make www a member of the user-specific group
 # -- Add user  # -- Add user
 if (system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername)) {  
   print "adding user: $safeusername \n" unless $noprint;
   my $status = system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername);
   if ($status) {
     print "Error.  Something went wrong with the addition of user ".      print "Error.  Something went wrong with the addition of user ".
   "\"$safeusername\".\n" unless $noprint;    "\"$safeusername\".\n" unless $noprint;
       print "Final status of useradd = $status";
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 12;      &Exit(12);
 }  }
   print "Done adding user\n" unless $noprint;
 # Make www a member of that user group.  # Make www a member of that user group.
 my $groups=`/usr/bin/groups www` or exit(6);  my $groups=`/usr/bin/groups www` or &Exit(6);
   print "groups $groups\n";
   # untaint
   my ($safegroups)=($groups=~/:\s*([\s\w]+)/);
   $groups=$safegroups;
 chomp $groups; $groups=~s/^\S+\s+\:\s+//;  chomp $groups; $groups=~s/^\S+\s+\:\s+//;
 my @grouplist=split(/\s+/,$groups);  my @grouplist=split(/\s+/,$groups);
 my @ugrouplist=grep {!/www|$safeusername/} @grouplist;  my @ugrouplist=grep {!/www|$safeusername/} @grouplist;
 my $gl=join(',',(@ugrouplist,$safeusername));  my $gl=join(',',(@ugrouplist,$safeusername));
   print "Putting user in its own group\n" unless $noprint;
 if (system('/usr/sbin/usermod','-G',$gl,'www')) {  if (system('/usr/sbin/usermod','-G',$gl,'www')) {
     print "Error. Could not make www a member of the group ".      print "Error. Could not make www a member of the group ".
   "\"$safeusername\".\n" unless $noprint;    "\"$safeusername\".\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 6;      &Exit(6);
 }  }
   
 # ---------------------------------------------------------------- Set password  # ---------------------------------------------------------------- Set password
Line 217  if (system('/usr/sbin/usermod','-G',$gl, Line 269  if (system('/usr/sbin/usermod','-G',$gl,
 unlink('/tmp/lock_lcpasswd');  unlink('/tmp/lock_lcpasswd');
 &disable_root_capability;  &disable_root_capability;
 ($>,$<)=($wwwid,$wwwid);  ($>,$<)=($wwwid,$wwwid);
   print "Opening lcpasswd pipeline\n" unless $noprint;
 open OUT,"|/home/httpd/perl/lcpasswd";  open OUT,"|/home/httpd/perl/lcpasswd";
 print OUT $safeusername;  print OUT $safeusername;
 print OUT "\n";  print OUT "\n";
Line 225  print OUT "\n"; Line 278  print OUT "\n";
 print OUT $password1;  print OUT $password1;
 print OUT "\n";  print OUT "\n";
 close OUT;  close OUT;
 ($>,$<)=($wwwid,0);  
 if ($?) {  if ($?) {
     exit 8;      print "abnormal Exit from close lcpasswd\n" unless $noprint;
       &Exit(8);
 }  }
   ($>,$<)=($wwwid,0);
 &enable_root_capability;  &enable_root_capability;
   
   # -- Don't add public_html... that can be added either by the user
   #    or by lchtmldir when the user is granted an authorship role.
   
 # ------------------------------ Make final modifications to the user directory  # ------------------------------ Make final modifications to the user directory
 # -- Add a public_html file with a stand-in index.html file  # -- Add a public_html file with a stand-in index.html file
   
 # system('/bin/chmod','-R','0660',"/home/$safeusername");   system('/bin/chmod','-R','0660',"/home/$safeusername");
 system('/bin/chmod','0710',"/home/$safeusername");  system('/bin/chmod','0710',"/home/$safeusername");
 mkdir "/home/$safeusername/public_html",0755;  mkdir "/home/$safeusername/public_html",0755;
 system('/bin/chmod','2770',"/home/$safeusername/public_html");  system('/bin/chmod','02770',"/home/$safeusername/public_html");
 open OUT,">/home/$safeusername/public_html/index.html";  open OUT,">/home/$safeusername/public_html/index.html";
 print OUT<<END;  print OUT<<END;
 <html>  <html>
Line 245  print OUT<<END; Line 302  print OUT<<END;
 <title>$safeusername</title>  <title>$safeusername</title>
 </head>  </head>
 <body>  <body>
 <h1>$safeusername</h1>  <h1>Construction Space</h1>
 <p>  <h3>$safeusername</h3>
 Learning Online Network  
 </p>  
 <p>  
 This area provides for:  
 </p>  
 <ul>  
 <li>resource construction</li>  
 <li>resource publication</li>  
 <li>record-keeping</li>  
 </ul>  
 </body>  </body>
 </html>  </html>
 END  END
 close OUT;  close OUT;
 system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername");  
   
   print "lcuseradd ownership\n" unless $noprint;
   system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername");
   # ---------------------------------------------------- Gracefull Apache Restart
   if (-e '/var/run/httpd.pid') {
       print "lcuseradd Apache restart\n" unless $noprint;
       open(PID,'/var/run/httpd.pid');
       my $pid=<PID>;
       close(PID);
       my ($safepid)=($pid=~s/(\D+)//g);
       if ($pid) {
    system('kill','-USR1',"$safepid");
       }
   }
 # -------------------------------------------------------- Exit script  # -------------------------------------------------------- Exit script
   print "lcuseradd Exiting\n" unless $noprint;
 &disable_root_capability;  &disable_root_capability;
 exit 0;  &Exit(0);
   
 # ---------------------------------------------- Have setuid script run as root  # ---------------------------------------------- Have setuid script run as root
 sub enable_root_capability {  sub enable_root_capability {
     if ($wwwid==$>) {      if ($wwwid==$>) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,0);
  ($(,$))=($),$();   ($(,$))=($),0);
     }      } else {
     else {  
  # root capability is already enabled   # root capability is already enabled
     }      }
     return $>;      return $>;
Line 284  sub disable_root_capability { Line 343  sub disable_root_capability {
     if ($wwwid==$<) {      if ($wwwid==$<) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,$<);
  ($(,$))=($),$();   ($(,$))=($),$();
     }      } else {
     else {  
  # root capability is already disabled   # root capability is already disabled
     }      }
 }  }
Line 314  sub try_to_lock { Line 372  sub try_to_lock {
     }      }
     sleep 3;      sleep 3;
     $lastpid=$currentpid;      $lastpid=$currentpid;
  }   } else {
  else {  
     last;      last;
  }   }
  if ($_==10) {   if ($_==10) {
Line 327  sub try_to_lock { Line 384  sub try_to_lock {
     close LOCK;      close LOCK;
     return 1;      return 1;
 }  }
   #-------------------------- Exit...
   #
   #   Write the file if the error_file is defined.  Regardless
   #   Exit with the status code.
   #
   sub Exit {
       my ($code) = @_; # Status code.
   
       print "Exiting with status $code error file is $error_file\n" unless $noprint;
       if($error_file) {
    open(FH, ">$error_file");
    print FH  "$code\n";
    close(FH);
       }
       exit $code;
   }
   
 =head1 NAME  =head1 NAME
   
Removed from v.1.17  
changed lines
  Added in v.1.29

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