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Diff for /loncom/Attic/lcuseradd between versions 1.11 and 1.22

version 1.11, 2000/10/30 02:57:47 version 1.22, 2002/09/16 13:27:40
Line 1 Line 1
 #!/usr/bin/perl  #!/usr/bin/perl
   
   # The Learning Online Network with CAPA
   #
   # lcuseradd - LON-CAPA setuid script to coordinate all actions
   #             with adding a user with filesystem privileges (e.g. author)
 #  #
 # lcuseradd  # YEAR=2000
   # 10/27,10/29,10/30 Scott Harrison
   # YEAR=2001
   # 10/21,11/13,11/15 Scott Harrison
   # YEAR=2002
   #   May 19, 2002 Ron Fox
   #      - Removed creation of the pulic_html directory.  This directory
   #        can now be added in two ways:
   #        o The user can add it themselves if they want some local web
   #          space which may or may not contain construction items.
   #        o LonCapa will add it if/when the user is granted an Author
   #          role.
 #  #
 # Scott Harrison  # $Id$
 # October 27, 2000  ###
   
   ###############################################################################
   ##                                                                           ##
   ## ORGANIZATION OF THIS PERL SCRIPT                                          ##
   ##                                                                           ##
   ## 1. Description of script                                                  ##
   ## 2. Invoking script (standard input)                                       ##
   ## 3. Example usage inside another piece of code                             ##
   ## 4. Description of functions                                               ##
   ## 5. Exit codes                                                             ##
   ## 6. Initializations                                                        ##
   ## 7. Make sure this process is running from user=www                        ##
   ## 8. Start running script with www permissions                              ##
   ## 9. Handle case of another lcpasswd process (locking)                      ##
   ## 10. Error-check input, need 3 values (user name, password 1, password 2)  ##
   ## 11. Start running script with root permissions                            ##
   ## 12. Add user and make www a member of the user-specific group             ##
   ## 13. Set password                                                          ##
   ## 14. Make final modifications to the user directory                        ##
   ## 15. Exit script (unlock)                                                  ##
   ##                                                                           ##
   ###############################################################################
   
 use strict;  use strict;
   
   # ------------------------------------------------------- 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 user entries to  
 # /etc/passwd and /etc/groups.  
 # 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.
   
 # Standard input usage  # -------------- Invoking script (standard input versus command-line arguments)
   #
   # 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
   #
   # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]
   # Yes, but be very careful here (don't pass shell commands)
   # and this is only supported to allow perl-system calls.
   #
 # Valid passwords must consist of the  # Valid passwords must consist of the
 # ascii characters within the inclusive  # ascii characters within the inclusive
 # range of 0x20 (32) to 0x7E (126).  # range of 0x20 (32) to 0x7E (126).
Line 27  use strict; Line 71  use strict;
 # SPACE and  # SPACE and
 # !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO  # !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO
 # PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~  # PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
   #
 # Valid user names must consist of ascii  # Valid user names must consist of ascii
 # characters that are alphabetical characters  # characters that are alphabetical characters
 # (A-Z,a-z), numeric (0-9), or the underscore  # (A-Z,a-z), numeric (0-9), or the underscore
 # mark (_). (Essentially, the perl regex \w).  # mark (_). (Essentially, the perl regex \w).
   # User names must begin with an alphabetical character
   # (A-Z,a-z).
   
 # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]  # ---------------------------------- Example usage inside another piece of code
 # Yes, but be very careful here (don't pass shell commands)  
 # and this is only supported to allow perl-system calls.  
   
 # Usage within code  # Usage within code
 #  #
 # $exitcode=system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;  # $exitcode=
   #      system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;
 # print "uh-oh" if $exitcode;  # print "uh-oh" if $exitcode;
   
   # ---------------------------------------------------- Description of functions
   # enable_root_capability() : have setuid script run as root
   # disable_root_capability() : have setuid script run as www
   # try_to_lock() : make sure that another lcpasswd process isn't running
   
   # ------------------------------------------------------------------ Exit codes
 # These are the exit codes.  # These are the exit codes.
   # ( (0,"ok"),
   # (1,"User ID mismatch.  This program must be run as user 'www'"),
   # (2,"Error. This program needs 3 command-line arguments (username, ".
   #    "password 1, password 2)."),
   # (3,"Error. Three lines should be entered into standard input."),
   # (4,"Error. Too many other simultaneous password change requests being ".
   #    "made."),
   # (5,"Error. User $username does not exist."),
   # (6,"Error. Could not make www a member of the group \"$safeusername\"."),
   # (7,"Error. Root was not successfully enabled.),
   # (8,"Error. Cannot set password."),
   # (9,"Error. The user name specified has invalid characters."),
   # (10,"Error. A password entry had an invalid character."),
   # (11,"Error. User already exists.),
   # (12,"Error. Something went wrong with the addition of user ".
   #     "\"$safeusername\"."),
   # (13,"Error. Password mismatch."),
   
   # ------------------------------------------------------------- Initializations
 # Security  # Security
 $ENV{'PATH'}=""; # Nullify path information.  $ENV{'PATH'}='/bin/:/usr/bin:/usr/local/sbin:/home/httpd/perl'; # Nullify path
 $ENV{'BASH_ENV'}=""; # Nullify shell environment information.                                                                  # information
   delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}; # nullify potential taints
   
 # Do not print error messages if there are command-line arguments  # Do not print error messages.
 my $noprint=0;  my $noprint=1;
 if (@ARGV) {  
     $noprint=1;  # ----------------------------- Make sure this process is running from user=www
 }  my $wwwid=getpwnam('www');
   &disable_root_capability;
 # Read in /etc/passwd, and make sure this process is running from user=www  if ($wwwid!=$>) {
 open (IN, "</etc/passwd");      print("User ID mismatch.  This program must be run as user 'www'\n")
 my @lines=<IN>;   unless $noprint;
 close IN;  
 my $wwwid;  
 for my $l (@lines) {  
     chop $l;  
     my @F=split(/\:/,$l);  
     if ($F[0] eq 'www') {$wwwid=$F[2];}  
 }  
 if ($wwwid!=$<) {  
     print("User ID mismatch.  This program must be run as user 'www'\n") unless $noprint;  
     exit 1;      exit 1;
 }  }
   
   # ----------------------------------- Start running script with www permissions
 &disable_root_capability;  &disable_root_capability;
   
 # Handle case of another lcpasswd process  # --------------------------- Handle case of another lcpasswd process (locking)
 unless (&try_to_lock("/tmp/lock_lcpasswd")) {  unless (&try_to_lock("/tmp/lock_lcpasswd")) {
     print "Error. Too many other simultaneous password change requests being made.\n" unless $noprint;      print "Error. Too many other simultaneous password change requests being ".
    "made.\n" unless $noprint;
     exit 4;      exit 4;
 }  }
   
 # Gather input.  Should be 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 3 command-line arguments (username, password 1, password 2).\n") unless $noprint;      print("Error. This program needs 3 command-line arguments (username, ".
     "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") unless $noprint;   print("Error. Three lines should be entered into standard input.\n")
       unless $noprint;
  unlink('/tmp/lock_lcpasswd');   unlink('/tmp/lock_lcpasswd');
  exit 3;   exit 3;
     }      }
     map {chop} @input;      foreach (@input) {chomp;}
 }  }
   
 my ($username,$password1,$password2)=@input;  my ($username,$password1,$password2)=@input;
   print "Username = ".$username unless $noprint;
 $username=~/^(\w+)$/;  $username=~/^(\w+)$/;
   print "Username after substitution - ".$username unless $noprint;
 my $safeusername=$1;  my $safeusername=$1;
 if ($username ne $safeusername) {  print "Safe username = $safeusername" unless $noprint;
     print "Error. The user name specified has invalid characters.\n";  
   if (($username ne $safeusername) or ($safeusername!~/^[A-Za-z]/)) {
       print "Error. The user name specified $username $safeusername  has invalid characters.\n"
    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";
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 10;      exit 10;
 }  }
   
 # 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 8;      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 7;      exit 13;
 }  }
   
   # ---------------------------------- Start running script with root permissions
 &enable_root_capability;  &enable_root_capability;
   
 # Add user entry to /etc/passwd and /etc/groups in such  # ------------------- Add user and make www a member of the user-specific group
 # a way that www is a member of the user-specific group  # -- Add user
   
 if (system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername)) {  if (system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername)) {
     print "Error.  Something went wrong with the addition of user \"$safeusername\".\n" unless $noprint;      print "Error.  Something went wrong with the addition of user ".
     "\"$safeusername\".\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 5;      exit 12;
 }  }
   
 # Make www a member of that user group.  # Make www a member of that user group.
 if (system('/usr/sbin/usermod','-G',$safeusername,'www')) {  my $groups=`/usr/bin/groups www` or exit(6);
     print "Error. Could not make www a member of the group \"$safeusername\".\n" unless $noprint;  chomp $groups; $groups=~s/^\S+\s+\:\s+//;
   my @grouplist=split(/\s+/,$groups);
   my @ugrouplist=grep {!/www|$safeusername/} @grouplist;
   my $gl=join(',',(@ugrouplist,$safeusername));
   if (system('/usr/sbin/usermod','-G',$gl,'www')) {
       print "Error. Could not make www a member of the group ".
     "\"$safeusername\".\n" unless $noprint;
     unlink('/tmp/lock_lcpasswd');      unlink('/tmp/lock_lcpasswd');
     exit 6;      exit 6;
 }  }
   
 # Set password with lcpasswd-style algorithm (which creates smbpasswd entry).  # ---------------------------------------------------------------- Set password
 # I cannot place a direct shell call to lcpasswd since I have to allow  # Set password with lcpasswd (which creates smbpasswd entry).
 # for crazy characters in the password, and the setuid environment of perl  
 # requires me to make everything safe.  
   
 # Grab the line corresponding to username  
 open (IN, "</etc/passwd");  
 @lines=<IN>;  
 close IN;  
 my ($userid,$useroldcryptpwd);  
 my @F; my @U;  
 for my $l (@lines) {  
     chop $l;  
     @F=split(/\:/,$l);  
     if ($F[0] eq $username) {($userid,$useroldcryptpwd)=($F[2],$F[1]); @U=@F;}  
 }  
   
 # Verify existence of user  
 if (!defined($userid)) {  
     print "Error. User $username does not exist.\n" unless $noprint;  
     unlink('/tmp/lock_lcpasswd');  
     exit 5;  
 }  
   
 # Construct new password entry (random salt)  unlink('/tmp/lock_lcpasswd');
 my $newcryptpwd=crypt($password1,(join '', ('.', '/', 0..9, 'A'..'Z', 'a'..'z')[rand 64, rand 64]));  &disable_root_capability;
 $U[1]=$newcryptpwd;  ($>,$<)=($wwwid,$wwwid);
 my $userline=join(':',@U);  open OUT,"|/home/httpd/perl/lcpasswd";
 my $rootid=&enable_root_capability;  print OUT $safeusername;
 if ($rootid!=0) {  print OUT "\n";
     print "Error.  Root was not successfully enabled.\n" unless $noprint;  print OUT $password1;
     unlink('/tmp/lock_lcpasswd');  print OUT "\n";
     exit 7;  print OUT $password1;
 }  print OUT "\n";
 open PASSWORDFILE, '>/etc/passwd' or (print("Error.  Cannot open /etc/passwd.\n") && unlink('/tmp/lock_lcpasswd') && exit(8));  
 for my $l (@lines) {  
     @F=split(/\:/,$l);  
     if ($F[0] eq $username) {print PASSWORDFILE "$userline\n";}  
     else {print PASSWORDFILE "$l\n";}  
 }  
 close PASSWORDFILE;  
   
 ($>,$<)=(0,0); # fool smbpasswd here to think this is not a setuid environment  
 unless (-e '/etc/smbpasswd') {  
     open (OUT,'>/etc/smbpasswd'); close OUT;  
 }  
 my $smbexist=0;  
 open (IN, '</etc/smbpasswd');  
 my @lines=<IN>;  
 close IN;  
 for my $l (@lines) {  
     chop $l;  
     my @F=split(/\:/,$l);  
     if ($F[0] eq $username) {$smbexist=1;}  
 }  
 unless ($smbexist) {  
     open(OUT,'>>/etc/smbpasswd');  
     print OUT join(':',($safeusername,$userid,'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX','','/home/'.$safeusername,'/bin/bash')) . "\n";  
     close OUT;  
 }  
 open(OUT,"|/usr/bin/smbpasswd -s $safeusername>/dev/null");  
 print OUT $password1; print OUT "\n";  
 print OUT $password1; print OUT "\n";  
 close OUT;  close OUT;
 $<=$wwwid; # unfool the program  if ($?) {
       exit 8;
   }
   ($>,$<)=($wwwid,0);
   &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','0640',"/home/$safeusername");   system('/bin/chmod','-R','0660',"/home/$safeusername");
 system('/bin/chmod','0750',"/home/$safeusername");  system('/bin/chmod','0710',"/home/$safeusername");
 mkdir "/home/$safeusername/public_html",0750;  mkdir "/home/$safeusername/public_html",0755;
   system('/bin/chmod','02770',"/home/$safeusername/public_html");
 open OUT,">/home/$safeusername/public_html/index.html";  open OUT,">/home/$safeusername/public_html/index.html";
 print OUT<<END;  print OUT<<END;
 <HTML>  <html>
 <HEAD>  <head>
 <TITLE>$safeusername</TITLE>  <title>$safeusername</title>
 </HEAD>  </head>
 <BODY>  <body>
 <H1>$safeusername</H1>  <h1>$safeusername</h1>
 <P>  <p>
 Learning Online Network  Learning Online Network
 </P>  </p>
 <P>  <p>
 This area provides for:  This area provides for:
 </P>  </p>
 <UL>  <ul>
 <LI>resource construction  <li>resource construction</li>
 <LI>resource publication  <li>resource publication</li>
 <LI>record-keeping  <li>record-keeping</li>
 </UL>  </ul>
 </BODY>  </body>
 </HTML>  </html>
 END  END
 close OUT;  close OUT;
   
 system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername");  system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername");
   
   # -------------------------------------------------------- Exit script
 &disable_root_capability;  &disable_root_capability;
 unlink('/tmp/lock_lcpasswd');  
 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 ($wwwid==$>) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,$<);
Line 257  sub enable_root_capability { Line 294  sub enable_root_capability {
     return $>;      return $>;
 }  }
   
 # ----------------------------------------------------------- have setuid script run as www  # ----------------------------------------------- Have setuid script run as www
 sub disable_root_capability {  sub disable_root_capability {
     if ($wwwid==$<) {      if ($wwwid==$<) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,$<);
Line 268  sub disable_root_capability { Line 305  sub disable_root_capability {
     }      }
 }  }
   
 # ----------------------------------- make sure that another lcpasswd process isn't running  # ----------------------- Make sure that another lcpasswd process isn't running
 sub try_to_lock {  sub try_to_lock {
     my ($lockfile)=@_;      my ($lockfile)=@_;
     my $currentpid;      my $currentpid;
Line 305  sub try_to_lock { Line 342  sub try_to_lock {
     close LOCK;      close LOCK;
     return 1;      return 1;
 }  }
   
   =head1 NAME
   
   lcuseradd - LON-CAPA setuid script to coordinate all actions
               with adding a user with filesystem privileges (e.g. author)
   
   =head1 DESCRIPTION
   
   lcuseradd - LON-CAPA setuid script to coordinate all actions
               with adding a user with filesystem privileges (e.g. author)
   
   =head1 README
   
   lcuseradd - LON-CAPA setuid script to coordinate all actions
               with adding a user with filesystem privileges (e.g. author)
   
   =head1 PREREQUISITES
   
   =head1 COREQUISITES
   
   =pod OSNAMES
   
   linux
   
   =pod SCRIPT CATEGORIES
   
   LONCAPA/Administrative
   
   =cut
Removed from v.1.11  
changed lines
  Added in v.1.22

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