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Diff for /loncom/Attic/lchtmldir between versions 1.11 and 1.20

version 1.11, 2004/10/20 09:30:57 version 1.20, 2007/08/22 19:53:22
Line 2 Line 2
   
 # The Learning Online Network with CAPA  # The Learning Online Network with CAPA
 #  #
   # $Id$
   #
 # Copyright Michigan State University Board of Trustees  # Copyright Michigan State University Board of Trustees
 #  #
 # This file is part of the LearningOnline Network with CAPA (LON-CAPA).  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
Line 41 Line 43
 #    NSCL  #    NSCL
 #    Michigan State University8  #    Michigan State University8
 #    East Lansing, MI 48824-1321  #    East Lansing, MI 48824-1321
   #
 #   General flow of control:  #   General flow of control:
 #   1. Validate process state (must be run as www).  #   1. Validate process state (must be run as www).
 #   2. Validate parameters:  Need two parameters:  #   2. Validate parameters:  Need two parameters:
Line 61 Line 63
 #       - internal - www:www/2775  #       - internal - www:www/2775
 #       - local    - www:www/2775  #       - local    - www:www/2775
 #  #
   #
 #  #
 #   Take a few precautions to be sure that we're not vulnerable to trojan  #   Take a few precautions to be sure that we're not vulnerable to trojan
 #   horses and other fine issues:  #   horses and other fine issues:
Line 69 Line 71
 use strict;   use strict; 
 use Fcntl qw(:mode);  use Fcntl qw(:mode);
 use DirHandle;  use DirHandle;
   use POSIX;
   use lib '/home/httpd/lib/perl/';
   use LONCAPA qw(:match);
   
 $ENV{'PATH'} = '/bin:/usr/bin:/usr/local/sbin:/home/httpd/perl';  $ENV{'PATH'} = '/bin:/usr/bin:/usr/local/sbin:/home/httpd/perl';
 delete @ENV{qw{IFS CDPATH ENV BASH_ENV}};  delete @ENV{qw{IFS CDPATH ENV BASH_ENV}};
   
 my $DEBUG = 0;                         # .nonzero -> Debug printing enabled.  my $DEBUG = 1;                         # .nonzero -> Debug printing enabled.
 my $path_sep = "/"; # Unix like operating systems.  my $path_sep = "/"; # Unix like operating systems.
   
   
Line 132  if( $authentication ne "unix:"     && Line 136  if( $authentication ne "unix:"     &&
   
 # Untaint the username.  # Untaint the username.
   
 my $match = $username =~ /^(\w+)$/;  my $match = $username =~ /^($match_username)$/;
 my $patt  = $1;  my $patt  = $1;
     
 if($DEBUG) {  if($DEBUG) {
Line 144  my $safeuser = $patt; Line 148  my $safeuser = $patt;
 if($DEBUG) {  if($DEBUG) {
     print("Save username = $safeuser \n");      print("Save username = $safeuser \n");
 }  }
 if(($username ne $safeuser) or ($safeuser!~/^[A-za-z]/)) {  if($username ne $safeuser) {
     if($DEBUG) {      if($DEBUG) {
  print("User name $username had illegal characters\n");   print("User name $username had illegal characters\n");
     }      }
Line 154  if(($username ne $safeuser) or ($safeuse Line 158  if(($username ne $safeuser) or ($safeuse
 #untaint the base directory require that the dir contain only   #untaint the base directory require that the dir contain only 
 # alphas, / numbers or underscores, and end in /$safeuser  # alphas, / numbers or underscores, and end in /$safeuser
   
 $dir =~ /(^([\w\/]+))/;  
   
 my $dirtry1 = $1;  
   
 $dir =~ /$\/$safeuser/;  my ($allowed_dir) = ($dir =~ m{(^([/]|$match_username)+)});
 my $dirtry2 = $1;  
   
 if(($dirtry1 ne $dir) or ($dirtry2 ne $dir)) {  my $has_correct_end = ($dir =~ m{/\Q$safeuser\E$});
   
   if(($allowed_dir ne $dir) or (!$has_correct_end)) {
     if ($DEBUG) {      if ($DEBUG) {
  print("Directory $dir is not a valid home for $safeuser\n");   print("Directory $dir is not a valid home for $safeuser\n");
     }      }
     exit 5;      exit 5;
 }  }
   
   
 # As root, create the directory.  # As root, create the directory.
   
 my $homedir = $dirtry1;  my $homedir = $allowed_dir;
 my $fulldir = $homedir."/public_html";  my $fulldir = $homedir."/public_html";
   
 if($DEBUG) {  if($DEBUG) {
     print("Full directory path is: $fulldir \n");      print("Full directory path is: $fulldir \n");
 }  }
 if(!( -e $dirtry1)) {  if(!( -e $homedir)) {
     if($DEBUG) {      if($DEBUG) {
  print("User's home directory $dirtry1 does not exist\n");   print("User's home directory $homedir does not exist\n");
     }      }
     if ($authentication eq "unix:") {      if ($authentication eq "unix:") {
         exit 6;          exit 6;
     }      }
 }  }
   if ($authentication eq "unix:") {
       # check whether group $safeuser exists.
       my $usergroups = `id -nG $safeuser`;
       if (! grep /^$safeuser$/, split(/\s+/,$usergroups)) { 
           if($DEBUG) {
               print("Group \"$safeuser\" does not exist or $safeuser is not a member of that group.\n");
           }
           exit 7;
       }
   }
   
   
   
 &EnableRoot;  &EnableRoot;
   
   #  If authentication is internal and the top level directory exists
   #  give it the right permissions (in case this is a modification.
   
   if ($authentication eq "internal:") {
       chmod(0711, $homedir); # so www can enter ~/public_html.
   }
   
 &System("/bin/mkdir -p $fulldir")   unless (-e $fulldir);  &System("/bin/mkdir -p $fulldir")   unless (-e $fulldir);
     unless(-e $fulldir."/index.html") {      unless(-e $fulldir."/index.html") {
  open OUT,">".$fulldir."/index.html";   open OUT,">".$fulldir."/index.html";
Line 214  END Line 236  END
     close OUT;      close OUT;
     }      }
   
 &System("/bin/chmod  02775  $fulldir");  &System("/bin/chmod  02770  $fulldir");
 &System("/bin/chmod  0775  $fulldir"."/index.html");  &System("/bin/chmod  0770  $fulldir"."/index.html");
   
   
 # Based on the authentiation mode, set the ownership of the directory.  # Based on the authentiation mode, set the ownership of the directory.
   
 if($authentication eq "unix:") { # Unix mode authentication...  if($authentication eq "unix:") { # Unix mode authentication...
     &System("/bin/chown -R   $safeuser".":".$safeuser." ".$fulldir);      print "Unix auth\n";
       &System("/bin/chown -R   $safeuser:$safeuser"." ".$fulldir);
     &JoinGroup($safeuser);      &JoinGroup($safeuser);
 } else {  } else {
     # Internal, Kerberos, and Local authentication are for users      # Internal, Kerberos, and Local authentication are for users
Line 237  if($authentication eq "unix:") { # Unix Line 260  if($authentication eq "unix:") { # Unix
  #  user's home directory that can reset ownerships and permissions   #  user's home directory that can reset ownerships and permissions
  #  back the way the used to be.   #  back the way the used to be.
   
  &write_restore_script($homedir);   # This can take long enough for lond to time out, so we'll do it
    # in a separate process that we'll not wait for.
  &System("/bin/chown -R root:root ".$homedir);   #
    my $fpid = fork;
    if($fpid) {
       &DisableRoot;
       exit 0;
    } else {
       print "Forked\n";
       POSIX::setsid(); # Disassociate from parent.
       print "Separate session\n";
       &write_restore_script($homedir);
       print "Restore script written\n";
       &System("/bin/chown -R root:root ".$homedir);
       &System("/bin/chown -R www:www  ".$fulldir);
       print "Exiting\n";
       exit 0;
    }
       } else {
    &System("/bin/chown -R www:www  ".$fulldir);
     }      }
     &System("/bin/chown -R www:www  ".$fulldir);  
 }  }
 &DisableRoot;  &DisableRoot;
   
Line 283  sub DisableRoot { Line 323  sub DisableRoot {
  print("Disable root: id = ".$>."\n");   print("Disable root: id = ".$>."\n");
     }      }
 }  }
   #
   #  Join the www user to the user's group.
   #  we must be running with euid as root at this time.
   #
 sub JoinGroup {  sub JoinGroup {
     my $usergroup = shift;      my $usergroup = shift;
   
Line 302  sub JoinGroup { Line 345  sub JoinGroup {
  }   }
  exit 6;   exit 6;
     }      }
           if (-e '/var/run/httpd.pid') {
    open(PID,'/var/run/httpd.pid');
    my $pid=<PID>;
    close(PID);
    my ($safepid) = $pid=~ /(\d+)/;
    $pid = $safepid;
    if ($pid) {
       my $status = system("kill -USR1 $safepid");
    }
       }
 }  }
   
   
Removed from v.1.11  
changed lines
  Added in v.1.20

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