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Diff for /loncom/lond between versions 1.212 and 1.232

version 1.212, 2004/07/27 10:25:07 version 1.232, 2004/08/18 11:31:50
Line 50  use File::Copy; Line 50  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use LONCAPA::ConfigFileEdit;
 use LONCAPA::lonlocal;  use LONCAPA::lonlocal;
 use LONCAPA::lonssl;  use LONCAPA::lonssl;
   use Fcntl qw(:flock);
   
 my $DEBUG = 0;       # Non zero to enable debug log entries.  my $DEBUG = 1;       # Non zero to enable debug log entries.
   
 my $status='';  my $status='';
 my $lastlog='';  my $lastlog='';
   
 my $VERSION='$Revision$'; #' stupid emacs  my $VERSION='$Revision$'; #' stupid emacs
 my $remoteVERSION;  my $remoteVERSION;
 my $currenthostid;  my $currenthostid="default";
 my $currentdomainid;  my $currentdomainid;
   
 my $client;  my $client;
Line 121  my @passwderrors = ("ok", Line 122  my @passwderrors = ("ok",
    "lcpasswd Cannot set new passwd.",     "lcpasswd Cannot set new passwd.",
    "lcpasswd Username has invalid characters",     "lcpasswd Username has invalid characters",
    "lcpasswd Invalid characters in password",     "lcpasswd Invalid characters in password",
     "11", "12",     "lcpasswd User already exists", 
     "lcpasswd Password mismatch");                     "lcpasswd Something went wrong with user addition.",
       "lcpasswd Password mismatch",
       "lcpasswd Error filename is invalid");
   
   
 #  The array below are lcuseradd error strings.:  #  The array below are lcuseradd error strings.:
Line 159  sub ResetStatistics { Line 162  sub ResetStatistics {
     $Failures     = 0;      $Failures     = 0;
 }  }
   
   
   
 #------------------------------------------------------------------------  #------------------------------------------------------------------------
 #  #
 #   LocalConnection  #   LocalConnection
Line 191  sub LocalConnection { Line 192  sub LocalConnection {
  ."$clientdns ne $thisserver </font>");   ."$clientdns ne $thisserver </font>");
  close $Socket;   close $Socket;
  return undef;   return undef;
     }       }  else {
     else {  
  chomp($initcmd); # Get rid of \n in filename.   chomp($initcmd); # Get rid of \n in filename.
  my ($init, $type, $name) = split(/:/, $initcmd);   my ($init, $type, $name) = split(/:/, $initcmd);
  Debug(" Init command: $init $type $name ");   Debug(" Init command: $init $type $name ");
Line 323  sub InsecureConnection { Line 323  sub InsecureConnection {
     $answer    =~s/\W//g;      $answer    =~s/\W//g;
     if($challenge eq $answer) {      if($challenge eq $answer) {
  return 1;   return 1;
     }       } else {
     else {  
  logthis("<font color='blue'>WARNING client did not respond to challenge</font>");   logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
  &status("No challenge reqply");   &status("No challenge reqply");
  return 0;   return 0;
Line 371  sub isClient { Line 370  sub isClient {
 #                     - This allows dynamic changes to the manager table  #                     - This allows dynamic changes to the manager table
 #                       without the need to signal to the lond.  #                       without the need to signal to the lond.
 #  #
   
 sub ReadManagerTable {  sub ReadManagerTable {
   
     #   Clean out the old table first..      #   Clean out the old table first..
Line 653  sub PushFile { Line 651  sub PushFile {
  &logthis('<font color="red"> Pushfile: unable to install '   &logthis('<font color="red"> Pushfile: unable to install '
  .$tablefile." $! </font>");   .$tablefile." $! </font>");
  return "error:$!";   return "error:$!";
     }      } else {
     else {  
  &logthis('<font color="green"> Installed new '.$tablefile   &logthis('<font color="green"> Installed new '.$tablefile
  ."</font>");   ."</font>");
   
Line 1032  sub tie_user_hash { Line 1029  sub tie_user_hash {
     }      }
           
 }  }
 #---------------------------------------------------------------  
   #--------------------- Request Handlers --------------------------------------------
 #  #
 #   Getting, decoding and dispatching requests:  #   By convention each request handler registers itself prior to the sub 
   #   declaration:
 #  #
   
   #++
 #  #
 #   Get a Request:  #  Handles ping requests.
 #   Gets a Request message from the client.  The transaction  #  Parameters:
 #   is defined as a 'line' of text.  We remove the new line  #      $cmd    - the actual keyword that invoked us.
 #   from the text line.    #      $tail   - the tail of the request that invoked us.
 #     #      $replyfd- File descriptor connected to the client
 sub get_request {  #  Implicit Inputs:
     my $input = <$client>;  #      $currenthostid - Global variable that carries the name of the host we are
     chomp($input);  #                       known as.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   
   sub ping_handler {
       my ($cmd, $tail, $client) = @_;
       Debug("$cmd $tail $client .. $currenthostid:");
      
       Reply( $client,"$currenthostid\n","$cmd:$tail");
      
       return 1;
   }
   &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
   
     Debug("get_request: Request = $input\n");  #++
   #
   # Handles pong requests.  Pong replies with our current host id, and
   #                         the results of a ping sent to us via our lonc.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host we are
   #                       connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   
     &status('Processing '.$clientname.':'.$input);  sub pong_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
     return $input;      my $reply=&reply("ping",$clientname);
       &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
       return 1;
 }  }
 #---------------------------------------------------------------  &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
   
   #++
   #      Called to establish an encrypted session key with the remote client.
   #      Note that with secure lond, in most cases this function is never
   #      invoked.  Instead, the secure session key is established either
   #      via a local file that's locked down tight and only lives for a short
   #      time, or via an ssl tunnel...and is generated from a bunch-o-random
   #      bits from /dev/urandom, rather than the predictable pattern used by
   #      by this sub.  This sub is only used in the old-style insecure
   #      key negotiation.
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Implicit Outputs:
   #      Reply information is sent to the client.
   #      $cipher is set with a reference to a new IDEA encryption object.
   #
   sub establish_key_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
       my $buildkey=time.$$.int(rand 100000);
       $buildkey=~tr/1-6/A-F/;
       $buildkey=int(rand 100000).$buildkey.int(rand 100000);
       my $key=$currenthostid.$clientname;
       $key=~tr/a-z/A-Z/;
       $key=~tr/G-P/0-9/;
       $key=~tr/Q-Z/0-9/;
       $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
       $key=substr($key,0,32);
       my $cipherkey=pack("H32",$key);
       $cipher=new IDEA $cipherkey;
       &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
      
       return 1;
   
   }
   &register_handler("ekey", \&establish_key_handler, 0, 1,1);
   
   
   #     Handler for the load command.  Returns the current system load average
   #     to the requestor.
 #  #
 #  Process a request.  This sub should shrink as each action  # Parameters:
 #  gets farmed out into a separat sub that is registered   #      $cmd    - the actual keyword that invoked us.
 #  with the dispatch hash.    #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit.
   #  Side effects:
   #      Reply information is sent to the client.
   sub load_handler {
       my ($cmd, $tail, $replyfd) = @_;
   
      # Get the load average from /proc/loadavg and calculate it as a percentage of
      # the allowed load limit as set by the perl global variable lonLoadLim
   
       my $loadavg;
       my $loadfile=IO::File->new('/proc/loadavg');
      
       $loadavg=<$loadfile>;
       $loadavg =~ s/\s.*//g;                      # Extract the first field only.
      
       my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
   
       &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
      
       return 1;
   }
   register_handler("load", \&load_handler, 0, 1, 0);
   
   #
   #   Process the userload request.  This sub returns to the client the current
   #  user load average.  It can be invoked either by clients or managers.
 #  #
 # Parameters:  # Parameters:
 #    user_input   - The request received from the client (lonc).  #      $cmd    - the actual keyword that invoked us.
 # Returns:  #      $tail   - the tail of the request that invoked us.
 #    true to keep processing, false if caller should exit.  #      $replyfd- File descriptor connected to the client
   #  Implicit Inputs:
   #      $currenthostid - Global variable that carries the name of the host
   #                       known as.
   #      $clientname    - Global variable that carries the name of the hsot we're connected to.
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit inputs:
   #     whatever the userload() function requires.
   #  Implicit outputs:
   #     the reply is written to the client.
 #  #
 sub process_request {  sub user_load_handler {
     my ($userinput) = @_;      # Easier for now to break style than to      my ($cmd, $tail, $replyfd) = @_;
                                 # fix all the userinput -> user_input.  
     my $wasenc    = 0; # True if request was encrypted.      my $userloadpercent=&userload();
 # ------------------------------------------------------------ See if encrypted      &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
     if ($userinput =~ /^enc/) {  
  $userinput = decipher($userinput);  
  $wasenc=1;  
  if(!$userinput) { # Cipher not defined.  
     &Failure($client, "error: Encrypted data without negotated key");  
     return 0;  
  }  
     }  
     Debug("process_request: $userinput\n");  
           
 # ------------------------------------------------------------- Normal commands      return 1;
 # ------------------------------------------------------------------------ ping  }
     if ($userinput =~ /^ping/) { # client only  register_handler("userload", \&user_load_handler, 0, 1, 0);
  if(isClient) {  
     print $client "$currenthostid\n";  #   Process a request for the authorization type of a user:
  } else {  #   (userauth).
     Reply($client, "refused\n", $userinput);  
  }  
 # ------------------------------------------------------------------------ pong  
     }elsif ($userinput =~ /^pong/) { # client only  
  if(isClient) {  
     my $reply=&reply("ping",$clientname);  
     print $client "$currenthostid:$reply\n";   
  } else {  
     Reply($client, "refused\n", $userinput);  
  }  
 # ------------------------------------------------------------------------ ekey  
     } elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs  
  my $buildkey=time.$$.int(rand 100000);  
  $buildkey=~tr/1-6/A-F/;  
  $buildkey=int(rand 100000).$buildkey.int(rand 100000);  
  my $key=$currenthostid.$clientname;  
  $key=~tr/a-z/A-Z/;  
  $key=~tr/G-P/0-9/;  
  $key=~tr/Q-Z/0-9/;  
  $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
  $key=substr($key,0,32);  
  my $cipherkey=pack("H32",$key);  
  $cipher=new IDEA $cipherkey;  
  print $client "$buildkey\n";   
 # ------------------------------------------------------------------------ load  
     } elsif ($userinput =~ /^load/) { # client only  
  if (isClient) {  
     my $loadavg;  
     {  
  my $loadfile=IO::File->new('/proc/loadavg');  
  $loadavg=<$loadfile>;  
     }  
     $loadavg =~ s/\s.*//g;  
     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};  
     print $client "$loadpercent\n";  
  } else {  
     Reply($client, "refused\n", $userinput);  
       
  }  
 # -------------------------------------------------------------------- userload  
     } elsif ($userinput =~ /^userload/) { # client only  
  if(isClient) {  
     my $userloadpercent=&userload();  
     print $client "$userloadpercent\n";  
  } else {  
     Reply($client, "refused\n", $userinput);  
       
  }  
 #  #
 #        Transactions requiring encryption:  # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $replyfd- File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   # Implicit outputs:
   #    The user authorization type is written to the client.
 #  #
 # ----------------------------------------------------------------- currentauth  sub user_authorization_type {
     } elsif ($userinput =~ /^currentauth/) {      my ($cmd, $tail, $replyfd) = @_;
  if (($wasenc==1)  && isClient) { # Encoded & client only.     
     my ($cmd,$udom,$uname)=split(/:/,$userinput);      my $userinput = "$cmd:$tail";
     my $result = GetAuthType($udom, $uname);     
     if($result eq "nouser") {      #  Pull the domain and username out of the command tail.
  print $client "unknown_user\n";      # and call get_auth_type to determine the authentication type.
     }     
     else {      my ($udom,$uname)=split(/:/,$tail);
  print $client "$result\n";      my $result = &get_auth_type($udom, $uname);
     }      if($result eq "nouser") {
  } else {   &Failure( $replyfd, "unknown_user\n", $userinput);
     Reply($client, "refused\n", $userinput);      } else {
        #
  }   # We only want to pass the second field from get_auth_type
 #--------------------------------------------------------------------- pushfile   # for ^krb.. otherwise we'll be handing out the encrypted
     } elsif($userinput =~ /^pushfile/) { # encoded & manager.   # password for internals e.g.
  if(($wasenc == 1) && isManager) {   #
     my $cert = GetCertificate($userinput);   my ($type,$otherinfo) = split(/:/,$result);
     if(ValidManager($cert)) {   if($type =~ /^krb/) {
  my $reply = PushFile($userinput);      $type = $result;
  print $client "$reply\n";  
     } else {  
  print $client "refused\n";  
     }   
  } else {  
     Reply($client, "refused\n", $userinput);  
       
  }  
 #--------------------------------------------------------------------- reinit  
     } elsif($userinput =~ /^reinit/) { # Encoded and manager  
  if (($wasenc == 1) && isManager) {  
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {  
  chomp($userinput);  
  my $reply = ReinitProcess($userinput);  
  print $client  "$reply\n";  
     } else {  
  print $client "refused\n";  
     }  
  } else {  
     Reply($client, "refused\n", $userinput);  
  }  
 #------------------------------------------------------------------------- edit  
     } elsif ($userinput =~ /^edit/) {    # encoded and manager:  
  if(($wasenc ==1) && (isManager)) {  
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {  
  my($command, $filetype, $script) = split(/:/, $userinput);  
  if (($filetype eq "hosts") || ($filetype eq "domain")) {  
     if($script ne "") {  
  Reply($client, EditFile($userinput));  
     } else {  
  Reply($client,"refused\n",$userinput);  
     }  
  } else {  
     Reply($client,"refused\n",$userinput);  
  }  
             } else {  
  Reply($client,"refused\n",$userinput);  
             }  
  } else {  
     Reply($client,"refused\n",$userinput);  
  }   }
 # ------------------------------------------------------------------------ auth   &Reply( $replyfd, "$type:\n", $userinput);
     } elsif ($userinput =~ /^auth/) { # Encoded and client only.      }
  if (($wasenc==1) && isClient) {    
     my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);      return 1;
     chomp($upass);  }
     $upass=unescape($upass);  &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
     my $proname=propath($udom,$uname);  
     my $passfilename="$proname/passwd";  #   Process a request by a manager to push a hosts or domain table 
     if (-e $passfilename) {  #   to us.  We pick apart the command and pass it on to the subs
  my $pf = IO::File->new($passfilename);  #   that already exist to do this.
  my $realpasswd=<$pf>;  #
  chomp($realpasswd);  # Parameters:
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  #      $cmd    - the actual keyword that invoked us.
  my $pwdcorrect=0;  #      $tail   - the tail of the request that invoked us.
  if ($howpwd eq 'internal') {  #      $client - File descriptor connected to the client
     &Debug("Internal auth");  #  Returns:
     $pwdcorrect=  #      1       - Ok to continue processing.
  (crypt($upass,$contentpwd) eq $contentpwd);  #      0       - Program should exit
  } elsif ($howpwd eq 'unix') {  # Implicit Output:
     &Debug("Unix auth");  #    a reply is written to the client.
     if((getpwnam($uname))[1] eq "") { #no such user!  
  $pwdcorrect = 0;  sub push_file_handler {
     } else {      my ($cmd, $tail, $client) = @_;
  $contentpwd=(getpwnam($uname))[1];  
  my $pwauth_path="/usr/local/sbin/pwauth";      my $userinput = "$cmd:$tail";
  unless ($contentpwd eq 'x') {  
     $pwdcorrect=      # At this time we only know that the IP of our partner is a valid manager
  (crypt($upass,$contentpwd) eq       # the code below is a hook to do further authentication (e.g. to resolve
  $contentpwd);      # spoofing).
  }  
       my $cert = &GetCertificate($userinput);
  elsif (-e $pwauth_path) {      if(&ValidManager($cert)) { 
     open PWAUTH, "|$pwauth_path" or  
  die "Cannot invoke authentication";   # Now presumably we have the bona fides of both the peer host and the
     print PWAUTH "$uname\n$upass\n";   # process making the request.
     close PWAUTH;        
     $pwdcorrect=!$?;   my $reply = &PushFile($userinput);
  }   &Reply($client, "$reply\n", $userinput);
     }  
  } elsif ($howpwd eq 'krb4') {      } else {
     my $null=pack("C",0);   &Failure( $client, "refused\n", $userinput);
     unless ($upass=~/$null/) {      } 
  my $krb4_error = &Authen::Krb4::get_pw_in_tkt      return 1;
     ($uname,"",$contentpwd,'krbtgt',  }
      $contentpwd,1,$upass);  &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
  if (!$krb4_error) {  
     $pwdcorrect = 1;  
  } else {   
     $pwdcorrect=0;   #   Process a reinit request.  Reinit requests that either
     # log error if it is not a bad password  #   lonc or lond be reinitialized so that an updated 
     if ($krb4_error != 62) {  #   host.tab or domain.tab can be processed.
  &logthis('krb4:'.$uname.','.  #
  &Authen::Krb4::get_err_txt($Authen::Krb4::error));  # Parameters:
     }  #      $cmd    - the actual keyword that invoked us.
  }  #      $tail   - the tail of the request that invoked us.
     }  #      $client - File descriptor connected to the client
  } elsif ($howpwd eq 'krb5') {  #  Returns:
     my $null=pack("C",0);  #      1       - Ok to continue processing.
     unless ($upass=~/$null/) {  #      0       - Program should exit
  my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);  #  Implicit output:
  my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;  #     a reply is sent to the client.
  my $krbserver=&Authen::Krb5::parse_name($krbservice);  #
  my $credentials=&Authen::Krb5::cc_default();  sub reinit_process_handler {
  $credentials->initialize($krbclient);      my ($cmd, $tail, $client) = @_;
  my $krbreturn =      
     &Authen::Krb5::get_in_tkt_with_password(      my $userinput = "$cmd:$tail";
     $krbclient,$krbserver,$upass,$credentials);     
 #  unless ($krbreturn) {      my $cert = &GetCertificate($userinput);
 #      &logthis("Krb5 Error: ".      if(&ValidManager($cert)) {
 #       &Authen::Krb5::error());   chomp($userinput);
 #  }   my $reply = &ReinitProcess($userinput);
  $pwdcorrect = ($krbreturn == 1);   &Reply( $client,  "$reply\n", $userinput);
     } else { $pwdcorrect=0; }      } else {
  } elsif ($howpwd eq 'localauth') {   &Failure( $client, "refused\n", $userinput);
     $pwdcorrect=&localauth::localauth($uname,$upass,      }
       $contentpwd);      return 1;
  }  }
  if ($pwdcorrect) {  
     print $client "authorized\n";  &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
  } else {  
     print $client "non_authorized\n";  #  Process the editing script for a table edit operation.
  }    #  the editing operation must be encrypted and requested by
   #  a manager host.
   #
   # Parameters:
   #      $cmd    - the actual keyword that invoked us.
   #      $tail   - the tail of the request that invoked us.
   #      $client - File descriptor connected to the client
   #  Returns:
   #      1       - Ok to continue processing.
   #      0       - Program should exit
   #  Implicit output:
   #     a reply is sent to the client.
   #
   sub edit_table_handler {
       my ($command, $tail, $client) = @_;
      
       my $userinput = "$command:$tail";
   
       my $cert = &GetCertificate($userinput);
       if(&ValidManager($cert)) {
    my($filetype, $script) = split(/:/, $tail);
    if (($filetype eq "hosts") || 
       ($filetype eq "domain")) {
       if($script ne "") {
    &Reply($client,              # BUGBUG - EditFile
         &EditFile($userinput), #   could fail.
         $userinput);
     } else {      } else {
  print $client "unknown_user\n";   &Failure($client,"refused\n",$userinput);
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client,"refused\n",$userinput);
       
  }   }
 # ---------------------------------------------------------------------- passwd      } else {
     } elsif ($userinput =~ /^passwd/) { # encoded and client   &Failure($client,"refused\n",$userinput);
  if (($wasenc==1) && isClient) {      }
     my       return 1;
  ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);  }
     chomp($npass);  register_handler("edit", \&edit_table_handler, 1, 0, 1);
     $upass=&unescape($upass);  
     $npass=&unescape($npass);  
     &Debug("Trying to change password for $uname");  #
     my $proname=propath($udom,$uname);  #   Authenticate a user against the LonCAPA authentication
     my $passfilename="$proname/passwd";  #   database.  Note that there are several authentication
     if (-e $passfilename) {  #   possibilities:
  my $realpasswd;  #   - unix     - The user can be authenticated against the unix
  { my $pf = IO::File->new($passfilename);  #                password file.
   $realpasswd=<$pf>; }  #   - internal - The user can be authenticated against a purely 
  chomp($realpasswd);  #                internal per user password file.
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
  if ($howpwd eq 'internal') {  #                ticket granting authority.
     &Debug("internal auth");  #   - user     - The person tailoring LonCAPA can supply a user authentication
     if (crypt($upass,$contentpwd) eq $contentpwd) {  #                mechanism that is per system.
  my $salt=time;  #
  $salt=substr($salt,6,2);  # Parameters:
  my $ncpass=crypt($npass,$salt);  #    $cmd      - The command that got us here.
  {  #    $tail     - Tail of the command (remaining parameters).
     my $pf;  #    $client   - File descriptor connected to client.
     if ($pf = IO::File->new(">$passfilename")) {  # Returns
  print $pf "internal:$ncpass\n";  #     0        - Requested to exit, caller should shut down.
  &logthis("Result of password change for $uname: pwchange_success");  #     1        - Continue processing.
  print $client "ok\n";  # Implicit inputs:
     } else {  #    The authentication systems describe above have their own forms of implicit
  &logthis("Unable to open $uname passwd to change password");  #    input into the authentication process that are described above.
  print $client "non_authorized\n";  #
     }  sub authenticate_handler {
  }                   my ($cmd, $tail, $client) = @_;
   
     } else {      
  print $client "non_authorized\n";      #  Regenerate the full input line 
     }      
  } elsif ($howpwd eq 'unix') {      my $userinput  = $cmd.":".$tail;
     # Unix means we have to access /etc/password      
     # one way or another.      #  udom    - User's domain.
     # First: Make sure the current password is      #  uname   - Username.
     #        correct      #  upass   - User's password.
     &Debug("auth is unix");      
     $contentpwd=(getpwnam($uname))[1];      my ($udom,$uname,$upass)=split(/:/,$tail);
     my $pwdcorrect = "0";      &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
     my $pwauth_path="/usr/local/sbin/pwauth";      chomp($upass);
     unless ($contentpwd eq 'x') {      $upass=&unescape($upass);
  $pwdcorrect=  
     (crypt($upass,$contentpwd) eq $contentpwd);      my $pwdcorrect = &validate_user($udom, $uname, $upass);
     } elsif (-e $pwauth_path) {      if($pwdcorrect) {
  open PWAUTH, "|$pwauth_path" or   &Reply( $client, "authorized\n", $userinput);
     die "Cannot invoke authentication";   #
  print PWAUTH "$uname\n$upass\n";   #  Bad credentials: Failed to authorize
  close PWAUTH;   #
  &Debug("exited pwauth with $? ($uname,$upass) ");      } else {
  $pwdcorrect=($? == 0);   &Failure( $client, "non_authorized\n", $userinput);
     }      }
     if ($pwdcorrect) {  
  my $execdir=$perlvar{'lonDaemons'};      return 1;
  &Debug("Opening lcpasswd pipeline");  }
  my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");  
  print $pf "$uname\n$npass\n$npass\n";  register_handler("auth", \&authenticate_handler, 1, 1, 0);
  close $pf;  
  my $err = $?;  #
  my $result = ($err>0 ? 'pwchange_failure'   #   Change a user's password.  Note that this function is complicated by
       : 'ok');  #   the fact that a user may be authenticated in more than one way:
  &logthis("Result of password change for $uname: ".  #   At present, we are not able to change the password for all types of
  &lcpasswdstrerror($?));  #   authentication methods.  Only for:
  print $client "$result\n";  #      unix    - unix password or shadow passoword style authentication.
     } else {  #      local   - Locally written authentication mechanism.
  print $client "non_authorized\n";  #   For now, kerb4 and kerb5 password changes are not supported and result
     }  #   in an error.
  } else {  # FUTURE WORK:
     print $client "auth_mode_error\n";  #    Support kerberos passwd changes?
  }    # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub change_password_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
   
       #
       #  udom  - user's domain.
       #  uname - Username.
       #  upass - Current password.
       #  npass - New password.
      
       my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
   
       $upass=&unescape($upass);
       $npass=&unescape($npass);
       &Debug("Trying to change password for $uname");
   
       # First require that the user can be authenticated with their
       # old password:
   
       my $validated = &validate_user($udom, $uname, $upass);
       if($validated) {
    my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
   
    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
    if ($howpwd eq 'internal') {
       &Debug("internal auth");
       my $salt=time;
       $salt=substr($salt,6,2);
       my $ncpass=crypt($npass,$salt);
       if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
    &logthis("Result of password change for "
    ."$uname: pwchange_success");
    &Reply($client, "ok\n", $userinput);
     } else {      } else {
  print $client "unknown_user\n";   &logthis("Unable to open $uname passwd "               
     }   ."to change password");
  } else {   &Failure( $client, "non_authorized\n",$userinput);
     Reply($client, "refused\n", $userinput);      }
        } elsif ($howpwd eq 'unix') {
  }      # Unix means we have to access /etc/password
 # -------------------------------------------------------------------- makeuser      &Debug("auth is unix");
     } elsif ($userinput =~ /^makeuser/) { # encoded and client.      my $execdir=$perlvar{'lonDaemons'};
  &Debug("Make user received");      &Debug("Opening lcpasswd pipeline");
       my $pf = IO::File->new("|$execdir/lcpasswd > "
      ."$perlvar{'lonDaemons'}"
      ."/logs/lcpasswd.log");
       print $pf "$uname\n$npass\n$npass\n";
       close $pf;
       my $err = $?;
       my $result = ($err>0 ? 'pwchange_failure' : 'ok');
       &logthis("Result of password change for $uname: ".
        &lcpasswdstrerror($?));
       &Reply($client, "$result\n", $userinput);
    } else {
       # this just means that the current password mode is not
       # one we know how to change (e.g the kerberos auth modes or
       # locally written auth handler).
       #
       &Failure( $client, "auth_mode_error\n", $userinput);
    }  
   
       } else {
    &Failure( $client, "non_authorized\n", $userinput);
       }
   
       return 1;
   }
   register_handler("passwd", \&change_password_handler, 1, 1, 0);
   
   
   #
   #   Create a new user.  User in this case means a lon-capa user.
   #   The user must either already exist in some authentication realm
   #   like kerberos or the /etc/passwd.  If not, a user completely local to
   #   this loncapa system is created.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   sub add_user_handler {
   
       my ($cmd, $tail, $client) = @_;
   
   
       my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
       my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
   
       &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
   
   
       if($udom eq $currentdomainid) { # Reject new users for other domains...
   
  my $oldumask=umask(0077);   my $oldumask=umask(0077);
  if (($wasenc==1) && isClient) {   chomp($npass);
     my    $npass=&unescape($npass);
  ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);   my $passfilename  = &password_path($udom, $uname);
     &Debug("cmd =".$cmd." $udom =".$udom.   &Debug("Password file created will be:".$passfilename);
    " uname=".$uname);   if (-e $passfilename) {
     chomp($npass);      &Failure( $client, "already_exists\n", $userinput);
     $npass=&unescape($npass);   } else {
     my $proname=propath($udom,$uname);      my @fpparts=split(/\//,$passfilename);
     my $passfilename="$proname/passwd";      my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
     &Debug("Password file created will be:".      my $fperror='';
    $passfilename);      for (my $i=3;$i<= ($#fpparts-1);$i++) {
     if (-e $passfilename) {   $fpnow.='/'.$fpparts[$i]; 
  print $client "already_exists\n";   unless (-e $fpnow) {
     } elsif ($udom ne $currentdomainid) {      &logthis("mkdir $fpnow");
  print $client "not_right_domain\n";      unless (mkdir($fpnow,0777)) {
     } else {   $fperror="error: ".($!+0)." mkdir failed while attempting "
  my @fpparts=split(/\//,$proname);      ."makeuser";
  my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
  my $fperror='';  
  for (my $i=3;$i<=$#fpparts;$i++) {  
     $fpnow.='/'.$fpparts[$i];   
     unless (-e $fpnow) {  
  unless (mkdir($fpnow,0777)) {  
     $fperror="error: ".($!+0)  
  ." mkdir failed while attempting "  
  ."makeuser";  
  }  
     }      }
  }   }
  unless ($fperror) {  
     my $result=&make_passwd_file($uname, $umode,$npass,  
  $passfilename);  
     print $client $result;  
  } else {  
     print $client "$fperror\n";  
  }  
     }      }
  } else {      unless ($fperror) {
     Reply($client, "refused\n", $userinput);   my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
        &Reply($client, $result, $userinput);     #BUGBUG - could be fail
  }  
  umask($oldumask);  
 # -------------------------------------------------------------- changeuserauth  
     } elsif ($userinput =~ /^changeuserauth/) { # encoded & client  
  &Debug("Changing authorization");  
  if (($wasenc==1) && isClient) {  
     my   
  ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);  
     chomp($npass);  
     &Debug("cmd = ".$cmd." domain= ".$udom.  
    "uname =".$uname." umode= ".$umode);  
     $npass=&unescape($npass);  
     my $proname=&propath($udom,$uname);  
     my $passfilename="$proname/passwd";  
     if ($udom ne $currentdomainid) {  
  print $client "not_right_domain\n";  
     } else {      } else {
  my $result=&make_passwd_file($uname, $umode,$npass,   &Failure($client, "$fperror\n", $userinput);
      $passfilename);  
  print $client $result;  
     }      }
  } else {  
     Reply($client, "refused\n", $userinput);  
       
  }   }
 # ------------------------------------------------------------------------ home   umask($oldumask);
     } elsif ($userinput =~ /^home/) { # client clear or encoded      }  else {
  if(isClient) {   &Failure($client, "not_right_domain\n",
     my ($cmd,$udom,$uname)=split(/:/,$userinput);   $userinput); # Even if we are multihomed.
     chomp($uname);      
     my $proname=propath($udom,$uname);      }
     if (-e $proname) {      return 1;
  print $client "found\n";  
     } else {  }
  print $client "not_found\n";  &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
     }  
  } else {  #
     Reply($client, "refused\n", $userinput);  #   Change the authentication method of a user.  Note that this may
       #   also implicitly change the user's password if, for example, the user is
   #   joining an existing authentication realm.  Known authentication realms at
   #   this time are:
   #    internal   - Purely internal password file (only loncapa knows this user)
   #    local      - Institutionally written authentication module.
   #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
   #    kerb4      - kerberos version 4
   #    kerb5      - kerberos version 5
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub change_authentication_handler {
   
       my ($cmd, $tail, $client) = @_;
      
       my $userinput  = "$cmd:$tail";              # Reconstruct user input.
   
       my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
       &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
       if ($udom ne $currentdomainid) {
    &Failure( $client, "not_right_domain\n", $client);
       } else {
   
    chomp($npass);
   
    $npass=&unescape($npass);
    my $passfilename = &password_path($udom, $uname);
    if ($passfilename) { # Not allowed to create a new user!!
       my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
       &Reply($client, $result, $userinput);
    } else {       
       &Failure($client, "non_authorized", $userinput); # Fail the user now.
  }   }
 # ---------------------------------------------------------------------- update      }
     } elsif ($userinput =~ /^update/) { # client clear or encoded.      return 1;
  if(isClient) {  }
     my ($cmd,$fname)=split(/:/,$userinput);  &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
     my $ownership=ishome($fname);  
     if ($ownership eq 'not_owner') {  #
  if (-e $fname) {  #   Determines if this is the home server for a user.  The home server
     my ($dev,$ino,$mode,$nlink,  #   for a user will have his/her lon-capa passwd file.  Therefore all we need
  $uid,$gid,$rdev,$size,  #   to do is determine if this file exists.
  $atime,$mtime,$ctime,  #
  $blksize,$blocks)=stat($fname);  # Parameters:
     my $now=time;  #    $cmd      - The command that got us here.
     my $since=$now-$atime;  #    $tail     - Tail of the command (remaining parameters).
     if ($since>$perlvar{'lonExpire'}) {  #    $client   - File descriptor connected to client.
  my $reply=  # Returns
     &reply("unsub:$fname","$clientname");  #     0        - Requested to exit, caller should shut down.
     unlink("$fname");  #     1        - Continue processing.
     } else {  # Implicit inputs:
  my $transname="$fname.in.transfer";  #    The authentication systems describe above have their own forms of implicit
  my $remoteurl=  #    input into the authentication process that are described above.
     &reply("sub:$fname","$clientname");  #
  my $response;  sub is_home_handler {
  {      my ($cmd, $tail, $client) = @_;
     my $ua=new LWP::UserAgent;     
     my $request=new HTTP::Request('GET',"$remoteurl");      my $userinput  = "$cmd:$tail";
     $response=$ua->request($request,$transname);     
  }      my ($udom,$uname)=split(/:/,$tail);
  if ($response->is_error()) {      chomp($uname);
     unlink($transname);      my $passfile = &password_filename($udom, $uname);
     my $message=$response->status_line;      if($passfile) {
     &logthis(   &Reply( $client, "found\n", $userinput);
      "LWP GET: $message for $fname ($remoteurl)");      } else {
  } else {   &Failure($client, "not_found\n", $userinput);
     if ($remoteurl!~/\.meta$/) {      }
  my $ua=new LWP::UserAgent;      return 1;
  my $mrequest=  }
     new HTTP::Request('GET',$remoteurl.'.meta');  &register_handler("home", \&is_home_handler, 0,1,0);
  my $mresponse=  
     $ua->request($mrequest,$fname.'.meta');  #
  if ($mresponse->is_error()) {  #   Process an update request for a resource?? I think what's going on here is
     unlink($fname.'.meta');  #   that a resource has been modified that we hold a subscription to.
  }  #   If the resource is not local, then we must update, or at least invalidate our
     }  #   cached copy of the resource. 
     rename($transname,$fname);  #   FUTURE WORK:
  }  #      I need to look at this logic carefully.  My druthers would be to follow
     }  #      typical caching logic, and simple invalidate the cache, drop any subscription
     print $client "ok\n";  #      an let the next fetch start the ball rolling again... however that may
  } else {  #      actually be more difficult than it looks given the complex web of
     print $client "not_found\n";  #      proxy servers.
  }  # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   # Implicit inputs:
   #    The authentication systems describe above have their own forms of implicit
   #    input into the authentication process that are described above.
   #
   sub update_resource_handler {
   
       my ($cmd, $tail, $client) = @_;
      
       my $userinput = "$cmd:$tail";
      
       my $fname= $tail; # This allows interactive testing
   
   
       my $ownership=ishome($fname);
       if ($ownership eq 'not_owner') {
    if (-e $fname) {
       my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
    $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
       my $now=time;
       my $since=$now-$atime;
       if ($since>$perlvar{'lonExpire'}) {
    my $reply=&reply("unsub:$fname","$clientname");
    unlink("$fname");
     } else {      } else {
  print $client "rejected\n";   my $transname="$fname.in.transfer";
     }   my $remoteurl=&reply("sub:$fname","$clientname");
  } else {  
     Reply($client, "refused\n", $userinput);  
       
  }  
 # -------------------------------------- fetch a user file from a remote server  
     } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.  
  if(isClient) {  
     my ($cmd,$fname)=split(/:/,$userinput);  
     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);  
     my $udir=propath($udom,$uname).'/userfiles';  
     unless (-e $udir) { mkdir($udir,0770); }  
     if (-e $udir) {  
  $ufile=~s/^[\.\~]+//;  
  my $path = $udir;  
  if ($ufile =~m|(.+)/([^/]+)$|) {  
     my @parts=split('/',$1);  
     foreach my $part (@parts) {  
  $path .= '/'.$part;  
  if ((-e $path)!=1) {  
     mkdir($path,0770);  
  }  
     }  
  }  
  my $destname=$udir.'/'.$ufile;  
  my $transname=$udir.'/'.$ufile.'.in.transit';  
  my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;  
  my $response;   my $response;
    alarm(120);
  {   {
     my $ua=new LWP::UserAgent;      my $ua=new LWP::UserAgent;
     my $request=new HTTP::Request('GET',"$remoteurl");      my $request=new HTTP::Request('GET',"$remoteurl");
     $response=$ua->request($request,$transname);      $response=$ua->request($request,$transname);
  }   }
    alarm(0);
  if ($response->is_error()) {   if ($response->is_error()) {
     unlink($transname);      unlink($transname);
     my $message=$response->status_line;      my $message=$response->status_line;
     &logthis("LWP GET: $message for $fname ($remoteurl)");      &logthis("LWP GET: $message for $fname ($remoteurl)");
     print $client "failed\n";  
  } else {   } else {
     if (!rename($transname,$destname)) {      if ($remoteurl!~/\.meta$/) {
  &logthis("Unable to move $transname to $destname");   alarm(120);
  unlink($transname);   {
  print $client "failed\n";      my $ua=new LWP::UserAgent;
     } else {      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
  print $client "ok\n";      my $mresponse=$ua->request($mrequest,$fname.'.meta');
       if ($mresponse->is_error()) {
    unlink($fname.'.meta');
       }
    }
    alarm(0);
     }      }
       rename($transname,$fname);
  }   }
     } else {  
  print $client "not_home\n";  
     }      }
       &Reply( $client, "ok\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "not_found\n", $userinput);
  }   }
 # --------------------------------------------------------- remove a user file       } else {
     } elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.   &Failure($client, "rejected\n", $userinput);
  if(isClient) {      }
     my ($cmd,$fname)=split(/:/,$userinput);      return 1;
     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);  }
     &logthis("$udom - $uname - $ufile");  &register_handler("update", \&update_resource_handler, 0 ,1, 0);
     if ($ufile =~m|/\.\./|) {  
  # any files paths with /../ in them refuse   #
  # to deal with  #   Fetch a user file from a remote server to the user's home directory
  print $client "refused\n";  #   userfiles subdir.
     } else {  # Parameters:
  my $udir=propath($udom,$uname);  #    $cmd      - The command that got us here.
  if (-e $udir) {  #    $tail     - Tail of the command (remaining parameters).
     my $file=$udir.'/userfiles/'.$ufile;  #    $client   - File descriptor connected to client.
     if (-e $file) {  # Returns
  unlink($file);  #     0        - Requested to exit, caller should shut down.
  if (-e $file) {  #     1        - Continue processing.
     print $client "failed\n";  #
  } else {  sub fetch_user_file_handler {
     print $client "ok\n";  
  }      my ($cmd, $tail, $client) = @_;
     } else {  
  print $client "not_found\n";      my $userinput = "$cmd:$tail";
     }      my $fname           = $tail;
  } else {      my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
     print $client "not_home\n";      my $udir=&propath($udom,$uname).'/userfiles';
       unless (-e $udir) {
    mkdir($udir,0770); 
       }
       Debug("fetch user file for $fname");
       if (-e $udir) {
    $ufile=~s/^[\.\~]+//;
   
    # IF necessary, create the path right down to the file.
    # Note that any regular files in the way of this path are
    # wiped out to deal with some earlier folly of mine.
   
    my $path = $udir;
    if ($ufile =~m|(.+)/([^/]+)$|) {
       my @parts=split('/',$1);
       foreach my $part (@parts) {
    $path .= '/'.$part;
    if( -f $path) {
       unlink($path);
    }
    if ((-e $path)!=1) {
       mkdir($path,0770);
  }   }
     }      }
  } else {  
     Reply($client, "refused\n", $userinput);  
  }   }
 # ------------------------------------------ authenticate access to a user file  
     } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only  
  if(isClient) {   my $destname=$udir.'/'.$ufile;
     my ($cmd,$fname,$session)=split(/:/,$userinput);   my $transname=$udir.'/'.$ufile.'.in.transit';
     chomp($session);   my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
     my $reply='non_auth';   my $response;
     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.   Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
      $session.'.id')) {   alarm(120);
  while (my $line=<ENVIN>) {   {
     if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }      my $ua=new LWP::UserAgent;
     }      my $request=new HTTP::Request('GET',"$remoteurl");
  close(ENVIN);      $response=$ua->request($request,$transname);
  print $client $reply."\n";   }
    alarm(0);
    if ($response->is_error()) {
       unlink($transname);
       my $message=$response->status_line;
       &logthis("LWP GET: $message for $fname ($remoteurl)");
       &Failure($client, "failed\n", $userinput);
    } else {
       Debug("Renaming $transname to $destname");
       if (!rename($transname,$destname)) {
    &logthis("Unable to move $transname to $destname");
    unlink($transname);
    &Failure($client, "failed\n", $userinput);
     } else {      } else {
  print $client "invalid_token\n";   &Reply($client, "ok\n", $userinput);
     }      }
  } else {   }   
     Reply($client, "refused\n", $userinput);      } else {
        &Failure($client, "not_home\n", $userinput);
  }      }
 # ----------------------------------------------------------------- unsubscribe      return 1;
     } elsif ($userinput =~ /^unsub/) {  }
  if(isClient) {  &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
     my ($cmd,$fname)=split(/:/,$userinput);  
     if (-e $fname) {  #
  print $client &unsub($fname,$clientip);  #   Remove a file from a user's home directory userfiles subdirectory.
   # Parameters:
   #    cmd   - the Lond request keyword that got us here.
   #    tail  - the part of the command past the keyword.
   #    client- File descriptor connected with the client.
   #
   # Returns:
   #    1    - Continue processing.
   
   sub remove_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
   
       my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
       if ($ufile =~m|/\.\./|) {
    # any files paths with /../ in them refuse 
    # to deal with
    &Failure($client, "refused\n", "$cmd:$tail");
       } else {
    my $udir = &propath($udom,$uname);
    if (-e $udir) {
       my $file=$udir.'/userfiles/'.$ufile;
       if (-e $file) {
    unlink($file);
    if (-e $file) {
       &Failure($client, "failed\n", "$cmd:$tail");
    } else {
       &Reply($client, "ok\n", "$cmd:$tail");
    }
     } else {      } else {
  print $client "not_found\n";   &Failure($client, "not_found\n", "$cmd:$tail");
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "not_home\n", "$cmd:$tail");
       
  }   }
 # ------------------------------------------------------------------- subscribe      }
     } elsif ($userinput =~ /^sub/) {      return 1;
  if(isClient) {  }
     print $client &subscribe($userinput,$clientip);  &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
  } else {  
     Reply($client, "refused\n", $userinput);  
       #
  }  #  Authenticate access to a user file by checking the user's 
 # ------------------------------------------------------------- current version  #  session token(?)
     } elsif ($userinput =~ /^currentversion/) {  #
  if(isClient) {  # Parameters:
     my ($cmd,$fname)=split(/:/,$userinput);  #   cmd      - The request keyword that dispatched to tus.
     print $client &currentversion($fname)."\n";  #   tail     - The tail of the request (colon separated parameters).
  } else {  #   client   - Filehandle open on the client.
     Reply($client, "refused\n", $userinput);  # Return:
       #    1.
   
   sub token_auth_user_file_handler {
       my ($cmd, $tail, $client) = @_;
   
       my ($fname, $session) = split(/:/, $tail);
       
       chomp($session);
       my $reply='non_auth';
       if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
        $session.'.id')) {
    while (my $line=<ENVIN>) {
       if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
  }   }
 # ------------------------------------------------------------------------- log   close(ENVIN);
     } elsif ($userinput =~ /^log/) {   &Reply($client, $reply);
  if(isClient) {      } else {
     my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);   &Failure($client, "invalid_token\n", "$cmd:$tail");
     chomp($what);      }
     my $proname=propath($udom,$uname);      return 1;
     my $now=time;  
     {  }
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname/activity.log")) {   &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
     print $hfh "$now:$clientname:$what\n";  
     print $client "ok\n";   
  } else {  #
     print $client "error: ".($!+0)  #   Unsubscribe from a resource.
  ." IO::File->new Failed "  #
  ."while attempting log\n";  # Parameters:
  }  #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub unsubscribe_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput= "$cmd:$tail";
       
       my ($fname) = split(/:/,$tail); # Split in case there's extrs.
   
       &Debug("Unsubscribing $fname");
       if (-e $fname) {
    &Debug("Exists");
    &Reply($client, &unsub($fname,$clientip), $userinput);
       } else {
    &Failure($client, "not_found\n", $userinput);
       }
       return 1;
   }
   &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
   #   Subscribe to a resource
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub subscribe_handler {
       my ($cmd, $tail, $client)= @_;
   
       my $userinput  = "$cmd:$tail";
   
       &Reply( $client, &subscribe($userinput,$clientip), $userinput);
   
       return 1;
   }
   &register_handler("sub", \&subscribe_handler, 0, 1, 0);
   
   #
   #   Determine the version of a resource (?) Or is it return
   #   the top version of the resource?  Not yet clear from the
   #   code in currentversion.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub current_version_handler {
       my ($cmd, $tail, $client) = @_;
   
       my $userinput= "$cmd:$tail";
      
       my $fname   = $tail;
       &Reply( $client, &currentversion($fname)."\n", $userinput);
       return 1;
   
   }
   &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
   
   #  Make an entry in a user's activity log.
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub activity_log_handler {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput= "$cmd:$tail";
   
       my ($udom,$uname,$what)=split(/:/,$tail);
       chomp($what);
       my $proname=&propath($udom,$uname);
       my $now=time;
       my $hfh;
       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
    print $hfh "$now:$clientname:$what\n";
    &Reply( $client, "ok\n", $userinput); 
       } else {
    &Failure($client, "error: ".($!+0)." IO::File->new Failed "
    ."while attempting log\n", 
    $userinput);
       }
   
       return 1;
   }
   register_handler("log", \&activity_log_handler, 0, 1, 0);
   
   #
   #   Put a namespace entry in a user profile hash.
   #   My druthers would be for this to be an encrypted interaction too.
   #   anything that might be an inadvertent covert channel about either
   #   user authentication or user personal information....
   #
   # Parameters:
   #    $cmd      - The command that got us here.
   #    $tail     - Tail of the command (remaining parameters).
   #    $client   - File descriptor connected to client.
   # Returns
   #     0        - Requested to exit, caller should shut down.
   #     1        - Continue processing.
   #
   sub put_user_profile_entry {
       my ($cmd, $tail, $client)  = @_;
   
       my $userinput = "$cmd:$tail";
       
       my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
       if ($namespace ne 'roles') {
    chomp($what);
    my $hashref = &tie_user_hash($udom, $uname, $namespace,
     &GDBM_WRCREAT(),"P",$what);
    if($hashref) {
       my @pairs=split(/\&/,$what);
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $hashref->{$key}=$value;
     }      }
  } else {      if (untie(%$hashref)) {
     Reply($client, "refused\n", $userinput);   &Reply( $client, "ok\n", $userinput);
       
  }  
 # ------------------------------------------------------------------------- put  
     } elsif ($userinput =~ /^put/) {  
  if(isClient) {  
     my ($cmd,$udom,$uname,$namespace,$what)  
  =split(/:/,$userinput,5);  
     $namespace=~s/\//\_/g;  
     $namespace=~s/\W//g;  
     if ($namespace ne 'roles') {  
  chomp($what);  
  my $proname=propath($udom,$uname);  
  my $now=time;  
  my @pairs=split(/\&/,$what);  
  my %hash;  
  if (tie(%hash,'GDBM_File',  
  "$proname/$namespace.db",  
  &GDBM_WRCREAT(),0640)) {  
     unless ($namespace=~/^nohist\_/) {  
  my $hfh;  
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }  
     }  
       
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $hash{$key}=$value;  
     }  
     if (untie(%hash)) {  
  print $client "ok\n";  
     } else {  
  print $client "error: ".($!+0)  
     ." untie(GDBM) failed ".  
     "while attempting put\n";  
     }  
  } else {  
     print $client "error: ".($!)  
  ." tie(GDBM) Failed ".  
  "while attempting put\n";  
  }  
     } else {      } else {
  print $client "refused\n";   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
    "while attempting put\n", 
    $userinput);
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
            "while attempting put\n", $userinput);
  }   }
 # ------------------------------------------------------------------- inc      } else {
     } elsif ($userinput =~ /^inc:/) {          &Failure( $client, "refused\n", $userinput);
  if(isClient) {      }
     my ($cmd,$udom,$uname,$namespace,$what)      
  =split(/:/,$userinput);      return 1;
     $namespace=~s/\//\_/g;  }
     $namespace=~s/\W//g;  &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
     if ($namespace ne 'roles') {  
  chomp($what);  # 
  my $proname=propath($udom,$uname);  #   Increment a profile entry in the user history file.
  my $now=time;  #   The history contains keyword value pairs.  In this case,
  my @pairs=split(/\&/,$what);  #   The value itself is a pair of numbers.  The first, the current value
  my %hash;  #   the second an increment that this function applies to the current
  if (tie(%hash,'GDBM_File',  #   value.
  "$proname/$namespace.db",  #
  &GDBM_WRCREAT(),0640)) {  # Parameters:
     unless ($namespace=~/^nohist\_/) {  #    $cmd      - The command that got us here.
  my $hfh;  #    $tail     - Tail of the command (remaining parameters).
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "P:$now:$what\n"; }  #    $client   - File descriptor connected to client.
     }  # Returns
     foreach my $pair (@pairs) {  #     0        - Requested to exit, caller should shut down.
  my ($key,$value)=split(/=/,$pair);  #     1        - Continue processing.
  # We could check that we have a number...  #
  if (! defined($value) || $value eq '') {  sub increment_user_value_handler {
     $value = 1;      my ($cmd, $tail, $client) = @_;
  }      
  $hash{$key}+=$value;      my $userinput   = "$cmd:$tail";
     }      
     if (untie(%hash)) {      my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
  print $client "ok\n";      if ($namespace ne 'roles') {
     } else {          chomp($what);
  print $client "error: ".($!+0)   my $hashref = &tie_user_hash($udom, $uname,
     ." untie(GDBM) failed ".       $namespace, &GDBM_WRCREAT(),
     "while attempting inc\n";       "P",$what);
     }   if ($hashref) {
  } else {      my @pairs=split(/\&/,$what);
     print $client "error: ".($!)      foreach my $pair (@pairs) {
  ." tie(GDBM) Failed ".   my ($key,$value)=split(/=/,$pair);
  "while attempting inc\n";   # We could check that we have a number...
    if (! defined($value) || $value eq '') {
       $value = 1;
  }   }
    $hashref->{$key}+=$value;
       }
       if (untie(%$hashref)) {
    &Reply( $client, "ok\n", $userinput);
     } else {      } else {
  print $client "refused\n";   &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
    "while attempting inc\n", $userinput);
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
            "while attempting inc\n", $userinput);
  }   }
 # -------------------------------------------------------------------- rolesput      } else {
     } elsif ($userinput =~ /^rolesput/) {   &Failure($client, "refused\n", $userinput);
  if(isClient) {      }
     &Debug("rolesput");      
     if ($wasenc==1) {      return 1;
  my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  }
     =split(/:/,$userinput);  &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
  &Debug("cmd = ".$cmd." exedom= ".$exedom.  
        "user = ".$exeuser." udom=".$udom.  
        "what = ".$what);  #
  my $namespace='roles';  #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
  chomp($what);  #   Each 'role' a user has implies a set of permissions.  Adding a new role
  my $proname=propath($udom,$uname);  #   for a person grants the permissions packaged with that role
  my $now=time;  #   to that user when the role is selected.
  my @pairs=split(/\&/,$what);  #
  my %hash;  # Parameters:
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  #    $cmd       - The command string (rolesput).
     {  #    $tail      - The remainder of the request line.  For rolesput this
  my $hfh;  #                 consists of a colon separated list that contains:
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {   #                 The domain and user that is granting the role (logged).
     print $hfh "P:$now:$exedom:$exeuser:$what\n";  #                 The domain and user that is getting the role.
  }  #                 The roles being granted as a set of & separated pairs.
     }  #                 each pair a key value pair.
       #    $client    - File descriptor connected to the client.
     foreach my $pair (@pairs) {  # Returns:
  my ($key,$value)=split(/=/,$pair);  #     0         - If the daemon should exit
  &ManagePermissions($key, $udom, $uname,  #     1         - To continue processing.
    &GetAuthType( $udom,   #
  $uname));  #
  $hash{$key}=$value;  sub roles_put_handler {
     }      my ($cmd, $tail, $client) = @_;
     if (untie(%hash)) {  
  print $client "ok\n";      my $userinput  = "$cmd:$tail";
     } else {  
  print $client "error: ".($!+0)      my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
     ." untie(GDBM) Failed ".      
     "while attempting rolesput\n";  
     }      my $namespace='roles';
  } else {      chomp($what);
     print $client "error: ".($!+0)      my $hashref = &tie_user_hash($udom, $uname, $namespace,
  ." tie(GDBM) Failed ".   &GDBM_WRCREAT(), "P",
  "while attempting rolesput\n";   "$exedom:$exeuser:$what");
     }      #
     } else {      #  Log the attempt to set a role.  The {}'s here ensure that the file 
  print $client "refused\n";      #  handle is open for the minimal amount of time.  Since the flush
     }      #  is done on close this improves the chances the log will be an un-
       #  corrupted ordered thing.
       if ($hashref) {
    my @pairs=split(/\&/,$what);
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       &manage_permissions($key, $udom, $uname,
          &get_auth_type( $udom, $uname));
       $hashref->{$key}=$value;
    }
    if (untie($hashref)) {
       &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
            "while attempting rolesput\n", $userinput);
  }   }
 # -------------------------------------------------------------------- rolesdel      } else {
     } elsif ($userinput =~ /^rolesdel/) {   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting rolesput\n", $userinput);
     &Debug("rolesdel");      }
     if ($wasenc==1) {      return 1;
  my ($cmd,$exedom,$exeuser,$udom,$uname,$what)  }
     =split(/:/,$userinput);  &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
  &Debug("cmd = ".$cmd." exedom= ".$exedom.  
        "user = ".$exeuser." udom=".$udom.  #
        "what = ".$what);  #   Deletes (removes) a role for a user.   This is equivalent to removing
  my $namespace='roles';  #  a permissions package associated with the role from the user's profile.
  chomp($what);  #
  my $proname=propath($udom,$uname);  # Parameters:
  my $now=time;  #     $cmd                 - The command (rolesdel)
  my @rolekeys=split(/\&/,$what);  #     $tail                - The remainder of the request line. This consists
  my %hash;  #                             of:
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  #                             The domain and user requesting the change (logged)
     {  #                             The domain and user being changed.
  my $hfh;  #                             The roles being revoked.  These are shipped to us
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {   #                             as a bunch of & separated role name keywords.
     print $hfh "D:$now:$exedom:$exeuser:$what\n";  #     $client              - The file handle open on the client.
  }  # Returns:
     }  #     1                    - Continue processing
     foreach my $key (@rolekeys) {  #     0                    - Exit.
  delete $hash{$key};  #
     }  sub roles_delete_handler {
     if (untie(%hash)) {      my ($cmd, $tail, $client)  = @_;
  print $client "ok\n";  
     } else {      my $userinput    = "$cmd:$tail";
  print $client "error: ".($!+0)     
     ." untie(GDBM) Failed ".      my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
     "while attempting rolesdel\n";      &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
     }     "what = ".$what);
  } else {      my $namespace='roles';
     print $client "error: ".($!+0)      chomp($what);
  ." tie(GDBM) Failed ".      my $hashref = &tie_user_hash($udom, $uname, $namespace,
  "while attempting rolesdel\n";   &GDBM_WRCREAT(), "D",
  }   "$exedom:$exeuser:$what");
     } else {      
  print $client "refused\n";      if ($hashref) {
     }   my @rolekeys=split(/\&/,$what);
   
    foreach my $key (@rolekeys) {
       delete $hashref->{$key};
    }
    if (untie(%$hashref)) {
       &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
            "while attempting rolesdel\n", $userinput);
  }   }
 # ------------------------------------------------------------------------- get      } else {
     } elsif ($userinput =~ /^get/) {          &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting rolesdel\n", $userinput);
     my ($cmd,$udom,$uname,$namespace,$what)      }
  =split(/:/,$userinput);      
     $namespace=~s/\//\_/g;      return 1;
     $namespace=~s/\W//g;  }
     chomp($what);  &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
     my @queries=split(/\&/,$what);  
     my $proname=propath($udom,$uname);  # Unencrypted get from a user's profile database.  See 
     my $qresult='';  # GetProfileEntryEncrypted for a version that does end-to-end encryption.
     my %hash;  # This function retrieves a keyed item from a specific named database in the
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  # user's directory.
  for (my $i=0;$i<=$#queries;$i++) {  #
     $qresult.="$hash{$queries[$i]}&";  # Parameters:
  }  #   $cmd             - Command request keyword (get).
  if (untie(%hash)) {  #   $tail            - Tail of the command.  This is a colon separated list
     $qresult=~s/\&$//;  #                      consisting of the domain and username that uniquely
     print $client "$qresult\n";  #                      identifies the profile,
  } else {  #                      The 'namespace' which selects the gdbm file to 
     print $client "error: ".($!+0)  #                      do the lookup in, 
  ." untie(GDBM) Failed ".  #                      & separated list of keys to lookup.  Note that
  "while attempting get\n";  #                      the values are returned as an & separated list too.
  }  #   $client          - File descriptor open on the client.
     } else {  # Returns:
  if ($!+0 == 2) {  #   1       - Continue processing.
     print $client "error:No such file or ".  #   0       - Exit.
  "GDBM reported bad block error\n";  #
  } else {  sub get_profile_entry {
     print $client "error: ".($!+0)      my ($cmd, $tail, $client) = @_;
  ." tie(GDBM) Failed ".  
  "while attempting get\n";      my $userinput= "$cmd:$tail";
  }     
     }      my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my @queries=split(/\&/,$what);
           my $qresult='';
   
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
    }
    $qresult=~s/\&$//;              # Remove trailing & from last lookup.
    if (untie(%$hashref)) {
       &Reply($client, "$qresult\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
           "while attempting get\n", $userinput);
  }   }
 # ------------------------------------------------------------------------ eget      } else {
     } elsif ($userinput =~ /^eget/) {   if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT
  if (isClient) {      &Failure($client, "error:No such file or ".
     my ($cmd,$udom,$uname,$namespace,$what)      "GDBM reported bad block error\n", $userinput);
  =split(/:/,$userinput);   } else {                        # Some other undifferentiated err.
     $namespace=~s/\//\_/g;      &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
     $namespace=~s/\W//g;      "while attempting get\n", $userinput);
     chomp($what);   }
     my @queries=split(/\&/,$what);      }
     my $proname=propath($udom,$uname);      return 1;
     my $qresult='';  }
     my %hash;  &register_handler("get", \&get_profile_entry, 0,1,0);
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
  for (my $i=0;$i<=$#queries;$i++) {  #
     $qresult.="$hash{$queries[$i]}&";  #  Process the encrypted get request.  Note that the request is sent
  }  #  in clear, but the reply is encrypted.  This is a small covert channel:
  if (untie(%hash)) {  #  information about the sensitive keys is given to the snooper.  Just not
     $qresult=~s/\&$//;  #  information about the values of the sensitive key.  Hmm if I wanted to
     if ($cipher) {  #  know these I'd snoop for the egets. Get the profile item names from them
  my $cmdlength=length($qresult);  #  and then issue a get for them since there's no enforcement of the
  $qresult.="         ";  #  requirement of an encrypted get for particular profile items.  If I
  my $encqresult='';  #  were re-doing this, I'd force the request to be encrypted as well as the
  for   #  reply.  I'd also just enforce encrypted transactions for all gets since
     (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  #  that would prevent any covert channel snooping.
  $encqresult.=  #
     unpack("H16",  #  Parameters:
    $cipher->encrypt(substr($qresult,$encidx,8)));  #     $cmd               - Command keyword of request (eget).
     }  #     $tail              - Tail of the command.  See GetProfileEntry #                          for more information about this.
  print $client "enc:$cmdlength:$encqresult\n";  #     $client            - File open on the client.
     } else {  #  Returns:
  print $client "error:no_key\n";  #     1      - Continue processing
     }  #     0      - server should exit.
  } else {  sub get_profile_entry_encrypted {
     print $client "error: ".($!+0)      my ($cmd, $tail, $client) = @_;
  ." untie(GDBM) Failed ".  
  "while attempting eget\n";      my $userinput = "$cmd:$tail";
      
       my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my @queries=split(/\&/,$what);
           my $qresult='';
    for (my $i=0;$i<=$#queries;$i++) {
       $qresult.="$hashref->{$queries[$i]}&";
    }
    if (untie(%$hashref)) {
       $qresult=~s/\&$//;
       if ($cipher) {
    my $cmdlength=length($qresult);
    $qresult.="         ";
    my $encqresult='';
    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
       $encqresult.= unpack("H16", 
    $cipher->encrypt(substr($qresult,
    $encidx,
    8)));
  }   }
    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
     } else {      } else {
  print $client "error: ".($!+0)   &Failure( $client, "error:no_key\n", $userinput);
     ." tie(GDBM) Failed ".  
     "while attempting eget\n";  
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
           "while attempting eget\n", $userinput);
  }   }
 # ------------------------------------------------------------------------- del      } else {
     } elsif ($userinput =~ /^del/) {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting eget\n", $userinput);
     my ($cmd,$udom,$uname,$namespace,$what)      }
  =split(/:/,$userinput);      
     $namespace=~s/\//\_/g;      return 1;
     $namespace=~s/\W//g;  }
     chomp($what);  &register_handler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);
     my $proname=propath($udom,$uname);  #
     my $now=time;  #   Deletes a key in a user profile database.
     my @keys=split(/\&/,$what);  #   
     my %hash;  #   Parameters:
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  #       $cmd                  - Command keyword (del).
  unless ($namespace=~/^nohist\_/) {  #       $tail                 - Command tail.  IN this case a colon
     my $hfh;  #                               separated list containing:
     if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { print $hfh "D:$now:$what\n"; }  #                               The domain and user that identifies uniquely
  }  #                               the identity of the user.
  foreach my $key (@keys) {  #                               The profile namespace (name of the profile
     delete($hash{$key});  #                               database file).
  }  #                               & separated list of keywords to delete.
  if (untie(%hash)) {  #       $client              - File open on client socket.
     print $client "ok\n";  # Returns:
  } else {  #     1   - Continue processing
     print $client "error: ".($!+0)  #     0   - Exit server.
  ." untie(GDBM) Failed ".  #
  "while attempting del\n";  #
  }  
     } else {  sub delete_profile_entry {
  print $client "error: ".($!+0)      my ($cmd, $tail, $client) = @_;
     ." tie(GDBM) Failed ".  
     "while attempting del\n";      my $userinput = "cmd:$tail";
     }  
       my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
       chomp($what);
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_WRCREAT(),
    "D",$what);
       if ($hashref) {
           my @keys=split(/\&/,$what);
    foreach my $key (@keys) {
       delete($hashref->{$key});
    }
    if (untie(%$hashref)) {
       &Reply($client, "ok\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
           "while attempting del\n", $userinput);
  }   }
 # ------------------------------------------------------------------------ keys      } else {
     } elsif ($userinput =~ /^keys/) {   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting del\n", $userinput);
     my ($cmd,$udom,$uname,$namespace)      }
  =split(/:/,$userinput);      return 1;
     $namespace=~s/\//\_/g;  }
     $namespace=~s/\W//g;  &register_handler("del", \&delete_profile_entry, 0, 1, 0);
     my $proname=propath($udom,$uname);  #
     my $qresult='';  #  List the set of keys that are defined in a profile database file.
     my %hash;  #  A successful reply from this will contain an & separated list of
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  #  the keys. 
  foreach my $key (keys %hash) {  # Parameters:
     $qresult.="$key&";  #     $cmd              - Command request (keys).
  }  #     $tail             - Remainder of the request, a colon separated
  if (untie(%hash)) {  #                         list containing domain/user that identifies the
     $qresult=~s/\&$//;  #                         user being queried, and the database namespace
     print $client "$qresult\n";  #                         (database filename essentially).
  } else {  #     $client           - File open on the client.
     print $client "error: ".($!+0)  #  Returns:
  ." untie(GDBM) Failed ".  #    1    - Continue processing.
  "while attempting keys\n";  #    0    - Exit the server.
  }  #
     } else {  sub get_profile_keys {
  print $client "error: ".($!+0)      my ($cmd, $tail, $client) = @_;
     ." tie(GDBM) Failed ".  
     "while attempting keys\n";      my $userinput = "$cmd:$tail";
     }  
       my ($udom,$uname,$namespace)=split(/:/,$tail);
       my $qresult='';
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
     &GDBM_READER());
       if ($hashref) {
    foreach my $key (keys %$hashref) {
       $qresult.="$key&";
    }
    if (untie(%$hashref)) {
       $qresult=~s/\&$//;
       &Reply($client, "$qresult\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
           "while attempting keys\n", $userinput);
  }   }
 # ----------------------------------------------------------------- dumpcurrent      } else {
     } elsif ($userinput =~ /^currentdump/) {   &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
  if (isClient) {   "while attempting keys\n", $userinput);
     my ($cmd,$udom,$uname,$namespace)      }
  =split(/:/,$userinput);     
     $namespace=~s/\//\_/g;      return 1;
     $namespace=~s/\W//g;  }
     my $qresult='';  &register_handler("keys", \&get_profile_keys, 0, 1, 0);
     my $proname=propath($udom,$uname);  
     my %hash;  #
     if (tie(%hash,'GDBM_File',  #   Dump the contents of a user profile database.
     "$proname/$namespace.db",  #   Note that this constitutes a very large covert channel too since
     &GDBM_READER(),0640)) {  #   the dump will return sensitive information that is not encrypted.
     # Structure of %data:  #   The naive security assumption is that the session negotiation ensures
  # $data{$symb}->{$parameter}=$value;  #   our client is trusted and I don't believe that's assured at present.
  # $data{$symb}->{'v.'.$parameter}=$version;  #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
  # since $parameter will be unescaped, we do not  #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
  # have to worry about silly parameter names...  # 
  my %data = ();  #  Parameters:
  while (my ($key,$value) = each(%hash)) {  #     $cmd           - The command request keyword (currentdump).
     my ($v,$symb,$param) = split(/:/,$key);  #     $tail          - Remainder of the request, consisting of a colon
     next if ($v eq 'version' || $symb eq 'keys');  #                      separated list that has the domain/username and
     next if (exists($data{$symb}) &&   #                      the namespace to dump (database file).
      exists($data{$symb}->{$param}) &&  #     $client        - file open on the remote client.
      $data{$symb}->{'v.'.$param} > $v);  # Returns:
     $data{$symb}->{$param}=$value;  #     1    - Continue processing.
     $data{$symb}->{'v.'.$param}=$v;  #     0    - Exit the server.
  }  #
  if (untie(%hash)) {  sub dump_profile_database {
     while (my ($symb,$param_hash) = each(%data)) {      my ($cmd, $tail, $client) = @_;
  while(my ($param,$value) = each (%$param_hash)){  
     next if ($param =~ /^v\./);      my $userinput = "$cmd:$tail";
     $qresult.=$symb.':'.$param.'='.$value.'&';     
  }      my ($udom,$uname,$namespace) = split(/:/,$tail);
     }      my $hashref = &tie_user_hash($udom, $uname, $namespace,
     chop($qresult);   &GDBM_READER());
     print $client "$qresult\n";      if ($hashref) {
  } else {   # Structure of %data:
     print $client "error: ".($!+0)   # $data{$symb}->{$parameter}=$value;
  ." untie(GDBM) Failed ".   # $data{$symb}->{'v.'.$parameter}=$version;
  "while attempting currentdump\n";   # since $parameter will be unescaped, we do not
     # have to worry about silly parameter names...
   
           my $qresult='';
    my %data = ();                     # A hash of anonymous hashes..
    while (my ($key,$value) = each(%$hashref)) {
       my ($v,$symb,$param) = split(/:/,$key);
       next if ($v eq 'version' || $symb eq 'keys');
       next if (exists($data{$symb}) && 
        exists($data{$symb}->{$param}) &&
        $data{$symb}->{'v.'.$param} > $v);
       $data{$symb}->{$param}=$value;
       $data{$symb}->{'v.'.$param}=$v;
    }
    if (untie(%$hashref)) {
       while (my ($symb,$param_hash) = each(%data)) {
    while(my ($param,$value) = each (%$param_hash)){
       next if ($param =~ /^v\./);       # Ignore versions...
       #
       #   Just dump the symb=value pairs separated by &
       #
       $qresult.=$symb.':'.$param.'='.$value.'&';
  }   }
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting currentdump\n";  
     }      }
       chop($qresult);
       &Reply($client , "$qresult\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        "while attempting currentdump\n", $userinput);
  }   }
 # ------------------------------------------------------------------------ dump      } else {
     } elsif ($userinput =~ /^dump/) {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting currentdump\n", $userinput);
     my ($cmd,$udom,$uname,$namespace,$regexp)      }
  =split(/:/,$userinput);  
     $namespace=~s/\//\_/g;      return 1;
     $namespace=~s/\W//g;  }
     if (defined($regexp)) {  &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
  $regexp=&unescape($regexp);  
   #
   #   Dump a profile database with an optional regular expression
   #   to match against the keys.  In this dump, no effort is made
   #   to separate symb from version information. Presumably the
   #   databases that are dumped by this command are of a different
   #   structure.  Need to look at this and improve the documentation of
   #   both this and the currentdump handler.
   # Parameters:
   #    $cmd                     - The command keyword.
   #    $tail                    - All of the characters after the $cmd:
   #                               These are expected to be a colon
   #                               separated list containing:
   #                               domain/user - identifying the user.
   #                               namespace   - identifying the database.
   #                               regexp      - optional regular expression
   #                                             that is matched against
   #                                             database keywords to do
   #                                             selective dumps.
   #   $client                   - Channel open on the client.
   # Returns:
   #    1    - Continue processing.
   # Side effects:
   #    response is written to $client.
   #
   sub dump_with_regexp {
       my ($cmd, $tail, $client) = @_;
   
   
       my $userinput = "$cmd:$tail";
   
       my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
       if (defined($regexp)) {
    $regexp=&unescape($regexp);
       } else {
    $regexp='.';
       }
       my $hashref = &tie_user_hash($udom, $uname, $namespace,
    &GDBM_READER());
       if ($hashref) {
           my $qresult='';
    while (my ($key,$value) = each(%$hashref)) {
       if ($regexp eq '.') {
    $qresult.=$key.'='.$value.'&';
     } else {      } else {
  $regexp='.';   my $unescapeKey = &unescape($key);
     }   if (eval('$unescapeKey=~/$regexp/')) {
     my $qresult='';      $qresult.="$key=$value&";
     my $proname=propath($udom,$uname);  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  
  while (my ($key,$value) = each(%hash)) {  
     if ($regexp eq '.') {  
  $qresult.=$key.'='.$value.'&';  
     } else {  
  my $unescapeKey = &unescape($key);  
  if (eval('$unescapeKey=~/$regexp/')) {  
     $qresult.="$key=$value&";  
  }  
     }  
  }   }
  if (untie(%hash)) {  
     chop($qresult);  
     print $client "$qresult\n";  
  } else {  
     print $client "error: ".($!+0)  
  ." untie(GDBM) Failed ".  
  "while attempting dump\n";  
  }  
     } else {  
  print $client "error: ".($!+0)  
     ." tie(GDBM) Failed ".  
     "while attempting dump\n";  
     }      }
    }
    if (untie(%$hashref)) {
       chop($qresult);
       &Reply($client, "$qresult\n", $userinput);
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
            "while attempting dump\n", $userinput);
  }   }
 # ----------------------------------------------------------------------- store      } else {
     } elsif ($userinput =~ /^store/) {   &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
  if(isClient) {   "while attempting dump\n", $userinput);
     my ($cmd,$udom,$uname,$namespace,$rid,$what)      }
  =split(/:/,$userinput);  
     $namespace=~s/\//\_/g;      return 1;
     $namespace=~s/\W//g;  }
     if ($namespace ne 'roles') {  
  chomp($what);  &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
  my $proname=propath($udom,$uname);  
  my $now=time;  #  Store a set of key=value pairs associated with a versioned name.
  my @pairs=split(/\&/,$what);  #
  my %hash;  #  Parameters:
  if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {  #    $cmd                - Request command keyword.
     unless ($namespace=~/^nohist\_/) {  #    $tail               - Tail of the request.  This is a colon
  my $hfh;  #                          separated list containing:
  if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {  #                          domain/user - User and authentication domain.
     print $hfh "P:$now:$rid:$what\n";  #                          namespace   - Name of the database being modified
  }  #                          rid         - Resource keyword to modify.
     }  #                          what        - new value associated with rid.
     my @previouskeys=split(/&/,$hash{"keys:$rid"});  #
     my $key;  #    $client             - Socket open on the client.
     $hash{"version:$rid"}++;  #
     my $version=$hash{"version:$rid"};  #
     my $allkeys='';   #  Returns:
     foreach my $pair (@pairs) {  #      1 (keep on processing).
  my ($key,$value)=split(/=/,$pair);  #  Side-Effects:
  $allkeys.=$key.':';  #    Writes to the client
  $hash{"$version:$rid:$key"}=$value;  sub store_handler {
     }      my ($cmd, $tail, $client) = @_;
     $hash{"$version:$rid:timestamp"}=$now;   
     $allkeys.='timestamp';      my $userinput = "$cmd:$tail";
     $hash{"$version:keys:$rid"}=$allkeys;  
     if (untie(%hash)) {      my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
  print $client "ok\n";      if ($namespace ne 'roles') {
     } else {  
  print $client "error: ".($!+0)   chomp($what);
     ." untie(GDBM) Failed ".   my @pairs=split(/\&/,$what);
     "while attempting store\n";   my $hashref  = &tie_user_hash($udom, $uname, $namespace,
  }         &GDBM_WRCREAT(), "P",
  } else {         "$rid:$what");
     print $client "error: ".($!+0)   if ($hashref) {
  ." tie(GDBM) Failed ".      my $now = time;
  "while attempting store\n";      my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
  }      my $key;
       $hashref->{"version:$rid"}++;
       my $version=$hashref->{"version:$rid"};
       my $allkeys=''; 
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $allkeys.=$key.':';
    $hashref->{"$version:$rid:$key"}=$value;
       }
       $hashref->{"$version:$rid:timestamp"}=$now;
       $allkeys.='timestamp';
       $hashref->{"$version:keys:$rid"}=$allkeys;
       if (untie($hashref)) {
    &Reply($client, "ok\n", $userinput);
     } else {      } else {
  print $client "refused\n";   &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
    "while attempting store\n", $userinput);
     }      }
  } else {   } else {
     Reply($client, "refused\n", $userinput);      &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
            "while attempting store\n", $userinput);
  }   }
 # --------------------------------------------------------------------- restore      } else {
     } elsif ($userinput =~ /^restore/) {   &Failure($client, "refused\n", $userinput);
  if(isClient) {      }
     my ($cmd,$udom,$uname,$namespace,$rid)  
  =split(/:/,$userinput);      return 1;
     $namespace=~s/\//\_/g;  }
     $namespace=~s/\W//g;  &register_handler("store", \&store_handler, 0, 1, 0);
     chomp($rid);  #
     my $proname=propath($udom,$uname);  #  Dump out all versions of a resource that has key=value pairs associated
     my $qresult='';  # with it for each version.  These resources are built up via the store
     my %hash;  # command.
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {  #
  my $version=$hash{"version:$rid"};  #  Parameters:
  $qresult.="version=$version&";  #     $cmd               - Command keyword.
  my $scope;  #     $tail              - Remainder of the request which consists of:
  for ($scope=1;$scope<=$version;$scope++) {  #                          domain/user   - User and auth. domain.
     my $vkeys=$hash{"$scope:keys:$rid"};  #                          namespace     - name of resource database.
     my @keys=split(/:/,$vkeys);  #                          rid           - Resource id.
     my $key;  #    $client             - socket open on the client.
     $qresult.="$scope:keys=$vkeys&";  #
     foreach $key (@keys) {  # Returns:
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";  #      1  indicating the caller should not yet exit.
     }                                    # Side-effects:
  }  #   Writes a reply to the client.
  if (untie(%hash)) {  #   The reply is a string of the following shape:
     $qresult=~s/\&$//;  #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
     print $client "$qresult\n";  #    Where the 1 above represents version 1.
  } else {  #    this continues for all pairs of keys in all versions.
     print $client "error: ".($!+0)  #
  ." untie(GDBM) Failed ".  #
  "while attempting restore\n";  #    
  }  #
     } else {  sub restore_handler {
  print $client "error: ".($!+0)      my ($cmd, $tail, $client) = @_;
     ." tie(GDBM) Failed ".  
     "while attempting restore\n";      my $userinput = "$cmd:$tail"; # Only used for logging purposes.
     }  
  } else  {      my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
     Reply($client, "refused\n", $userinput);      $namespace=~s/\//\_/g;
           $namespace=~s/\W//g;
       chomp($rid);
       my $proname=&propath($udom,$uname);
       my $qresult='';
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
       &GDBM_READER(),0640)) {
    my $version=$hash{"version:$rid"};
    $qresult.="version=$version&";
    my $scope;
    for ($scope=1;$scope<=$version;$scope++) {
       my $vkeys=$hash{"$scope:keys:$rid"};
       my @keys=split(/:/,$vkeys);
       my $key;
       $qresult.="$scope:keys=$vkeys&";
       foreach $key (@keys) {
    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
       }                                  
    }
    if (untie(%hash)) {
       $qresult=~s/\&$//;
       &Reply( $client, "$qresult\n", $userinput);
    } else {
       &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
       "while attempting restore\n", $userinput);
  }   }
       } else {
    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
    "while attempting restore\n", $userinput);
       }
     
       return 1;
   
   
   }
   &register_handler("restore", \&restore_handler, 0,1,0);
   #
   #
   #---------------------------------------------------------------
   #
   #   Getting, decoding and dispatching requests:
   #
   
   #
   #   Get a Request:
   #   Gets a Request message from the client.  The transaction
   #   is defined as a 'line' of text.  We remove the new line
   #   from the text line.  
   #
   sub get_request {
       my $input = <$client>;
       chomp($input);
   
       Debug("get_request: Request = $input\n");
   
       &status('Processing '.$clientname.':'.$input);
   
       return $input;
   }
   #---------------------------------------------------------------
   #
   #  Process a request.  This sub should shrink as each action
   #  gets farmed out into a separat sub that is registered 
   #  with the dispatch hash.  
   #
   # Parameters:
   #    user_input   - The request received from the client (lonc).
   # Returns:
   #    true to keep processing, false if caller should exit.
   #
   sub process_request {
       my ($userinput) = @_;      # Easier for now to break style than to
                                   # fix all the userinput -> user_input.
       my $wasenc    = 0; # True if request was encrypted.
   # ------------------------------------------------------------ See if encrypted
       if ($userinput =~ /^enc/) {
    $userinput = decipher($userinput);
    $wasenc=1;
    if(!$userinput) { # Cipher not defined.
       &Failure($client, "error: Encrypted data without negotated key");
       return 0;
    }
       }
       Debug("process_request: $userinput\n");
       
       #  
       #   The 'correct way' to add a command to lond is now to
       #   write a sub to execute it and Add it to the command dispatch
       #   hash via a call to register_handler..  The comments to that
       #   sub should give you enough to go on to show how to do this
       #   along with the examples that are building up as this code
       #   is getting refactored.   Until all branches of the
       #   if/elseif monster below have been factored out into
       #   separate procesor subs, if the dispatch hash is missing
       #   the command keyword, we will fall through to the remainder
       #   of the if/else chain below in order to keep this thing in 
       #   working order throughout the transmogrification.
   
       my ($command, $tail) = split(/:/, $userinput, 2);
       chomp($command);
       chomp($tail);
       $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
       $command =~ s/(\r)//; # And this too for parameterless commands.
       if(!$tail) {
    $tail =""; # defined but blank.
       }
   
       &Debug("Command received: $command, encoded = $wasenc");
   
       if(defined $Dispatcher{$command}) {
   
    my $dispatch_info = $Dispatcher{$command};
    my $handler       = $$dispatch_info[0];
    my $need_encode   = $$dispatch_info[1];
    my $client_types  = $$dispatch_info[2];
    Debug("Matched dispatch hash: mustencode: $need_encode "
         ."ClientType $client_types");
         
    #  Validate the request:
         
    my $ok = 1;
    my $requesterprivs = 0;
    if(&isClient()) {
       $requesterprivs |= $CLIENT_OK;
    }
    if(&isManager()) {
       $requesterprivs |= $MANAGER_OK;
    }
    if($need_encode && (!$wasenc)) {
       Debug("Must encode but wasn't: $need_encode $wasenc");
       $ok = 0;
    }
    if(($client_types & $requesterprivs) == 0) {
       Debug("Client not privileged to do this operation");
       $ok = 0;
    }
   
    if($ok) {
       Debug("Dispatching to handler $command $tail");
       my $keep_going = &$handler($command, $tail, $client);
       return $keep_going;
    } else {
       Debug("Refusing to dispatch because client did not match requirements");
       Failure($client, "refused\n", $userinput);
       return 1;
    }
   
       }    
   
   #------------------- Commands not yet in spearate handlers. --------------
   
   
   
 # -------------------------------------------------------------------- chatsend  # -------------------------------------------------------------------- chatsend
     } elsif ($userinput =~ /^chatsend/) {     if ($userinput =~ /^chatsend/) {
  if(isClient) {   if(isClient) {
     my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);      my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
     &chatadd($cdom,$cnum,$newpost);      &chatadd($cdom,$cnum,$newpost);
Line 2239  sub process_request { Line 2865  sub process_request {
  print $store2 "done\n";   print $store2 "done\n";
  close $store2;   close $store2;
  print $client "ok\n";   print $client "ok\n";
     }      } else {
     else {  
  print $client "error: ".($!+0)   print $client "error: ".($!+0)
     ." IO::File->new Failed ".      ." IO::File->new Failed ".
     "while attempting queryreply\n";      "while attempting queryreply\n";
Line 2555  sub process_request { Line 3180  sub process_request {
  return 0;   return 0;
   
 # ---------------------------------- set current host/domain  # ---------------------------------- set current host/domain
     } elsif ($userinput =~ /^sethost:/) {      } elsif ($userinput =~ /^sethost/) {
  if (isClient) {   if (isClient) {
     print $client &sethost($userinput)."\n";      print $client &sethost($userinput)."\n";
  } else {   } else {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #---------------------------------- request file (?) version.  #---------------------------------- request file (?) version.
     } elsif ($userinput =~/^version:/) {      } elsif ($userinput =~/^version/) {
  if (isClient) {   if (isClient) {
     print $client &version($userinput)."\n";      print $client &version($userinput)."\n";
  } else {   } else {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #------------------------------- is auto-enrollment enabled?  #------------------------------- is auto-enrollment enabled?
     } elsif ($userinput =~/^autorun:/) {      } elsif ($userinput =~/^autorun/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$cdom) = split(/:/,$userinput);      my ($cmd,$cdom) = split(/:/,$userinput);
     my $outcome = &localenroll::run($cdom);      my $outcome = &localenroll::run($cdom);
Line 2578  sub process_request { Line 3203  sub process_request {
     print $client "0\n";      print $client "0\n";
  }   }
 #------------------------------- get official sections (for auto-enrollment).  #------------------------------- get official sections (for auto-enrollment).
     } elsif ($userinput =~/^autogetsections:/) {      } elsif ($userinput =~/^autogetsections/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);      my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
     my @secs = &localenroll::get_sections($coursecode,$cdom);      my @secs = &localenroll::get_sections($coursecode,$cdom);
Line 2588  sub process_request { Line 3213  sub process_request {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #----------------------- validate owner of new course section (for auto-enrollment).  #----------------------- validate owner of new course section (for auto-enrollment).
     } elsif ($userinput =~/^autonewcourse:/) {      } elsif ($userinput =~/^autonewcourse/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);      my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);      my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
Line 2597  sub process_request { Line 3222  sub process_request {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #-------------- validate course section in schedule of classes (for auto-enrollment).  #-------------- validate course section in schedule of classes (for auto-enrollment).
     } elsif ($userinput =~/^autovalidatecourse:/) {      } elsif ($userinput =~/^autovalidatecourse/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);      my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);      my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
Line 2606  sub process_request { Line 3231  sub process_request {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #--------------------------- create password for new user (for auto-enrollment).  #--------------------------- create password for new user (for auto-enrollment).
     } elsif ($userinput =~/^autocreatepassword:/) {      } elsif ($userinput =~/^autocreatepassword/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$authparam,$cdom)=split(/:/,$userinput);      my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
     my ($create_passwd,$authchk);      my ($create_passwd,$authchk);
Line 2616  sub process_request { Line 3241  sub process_request {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #---------------------------  read and remove temporary files (for auto-enrollment).  #---------------------------  read and remove temporary files (for auto-enrollment).
     } elsif ($userinput =~/^autoretrieve:/) {      } elsif ($userinput =~/^autoretrieve/) {
  if (isClient) {   if (isClient) {
     my ($cmd,$filename) = split(/:/,$userinput);      my ($cmd,$filename) = split(/:/,$userinput);
     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;      my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
Line 2642  sub process_request { Line 3267  sub process_request {
     print $client "refused\n";      print $client "refused\n";
  }   }
 #---------------------  read and retrieve institutional code format (for support form).  #---------------------  read and retrieve institutional code format (for support form).
     } elsif ($userinput =~/^autoinstcodeformat:/) {      } elsif ($userinput =~/^autoinstcodeformat/) {
  if (isClient) {   if (isClient) {
     my $reply;      my $reply;
     my($cmd,$cdom,$course) = split(/:/,$userinput);      my($cmd,$cdom,$course) = split(/:/,$userinput);
Line 2754  sub register_handler { Line 3379  sub register_handler {
         
     $Dispatcher{$request_name} = \@entry;      $Dispatcher{$request_name} = \@entry;
         
      
 }  }
   
   
Line 2801  sub catchexception { Line 3425  sub catchexception {
     $server->close();      $server->close();
     die($error);      die($error);
 }  }
   
 sub timeout {  sub timeout {
     &status("Handling Timeout");      &status("Handling Timeout");
     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");      &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
Line 2809  sub timeout { Line 3432  sub timeout {
 }  }
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
   
   
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   
Line 3009  sub checkchildren { Line 3633  sub checkchildren {
     &logthis('Going to check on the children');      &logthis('Going to check on the children');
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     foreach (sort keys %children) {      foreach (sort keys %children) {
  sleep 1;   #sleep 1;
         unless (kill 'USR1' => $_) {          unless (kill 'USR1' => $_) {
     &logthis ('Child '.$_.' is dead');      &logthis ('Child '.$_.' is dead');
             &logstatus($$.' is dead');              &logstatus($$.' is dead');
       delete($children{$_});
         }           } 
     }      }
     sleep 5;      sleep 5;
Line 3031  sub checkchildren { Line 3656  sub checkchildren {
     #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;      #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
     #$execdir=$perlvar{'lonDaemons'};      #$execdir=$perlvar{'lonDaemons'};
     #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;      #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
       delete($children{$_});
     alarm(0);      alarm(0);
   }    }
         }          }
Line 3038  sub checkchildren { Line 3664  sub checkchildren {
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
     $SIG{__DIE__} = \&catchexception;      $SIG{__DIE__} = \&catchexception;
     &status("Finished checking children");      &status("Finished checking children");
       &logthis('Finished Checking children');
 }  }
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
Line 3069  sub Debug { Line 3696  sub Debug {
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 sub Reply {  sub Reply {
     alarm(120);  
     my $fd      = shift;  
     my $reply   = shift;  
     my $request = shift;  
   
     my ($fd, $reply, $request) = @_;      my ($fd, $reply, $request) = @_;
     print $fd $reply;      print $fd $reply;
     Debug("Request was $request  Reply was $reply");      Debug("Request was $request  Reply was $reply");
   
     $Transactions++;      $Transactions++;
     alarm(0);  
   
   
 }  }
Line 3114  sub logstatus { Line 3735  sub logstatus {
     &status("Doing logging");      &status("Doing logging");
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     {      {
     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");  
     print $fh $$."\t".$clientname."\t".$currenthostid."\t"  
  .$status."\t".$lastlog."\t $keymode\n";  
     $fh->close();  
     }  
     &status("Finished londstatus.txt");  
     {  
  my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
         print $fh $status."\n".$lastlog."\n".time."\n$keymode";          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
         $fh->close();          $fh->close();
     }      }
       &status("Finished $$.txt");
       {
    open(LOG,">>$docdir/lon-status/londstatus.txt");
    flock(LOG,LOCK_EX);
    print LOG $$."\t".$clientname."\t".$currenthostid."\t"
       .$status."\t".$lastlog."\t $keymode\n";
    flock(DB,LOCK_UN);
    close(LOG);
       }
     &status("Finished logging");      &status("Finished logging");
 }  }
   
Line 3439  sub make_new_child { Line 4062  sub make_new_child {
  $inittype = ""; # This forces insecure attempt.   $inittype = ""; # This forces insecure attempt.
  &logthis("<font color=\"blue\"> Certificates not "   &logthis("<font color=\"blue\"> Certificates not "
  ."installed -- trying insecure auth</font>");   ."installed -- trying insecure auth</font>");
     }      } else { # SSL certificates are in place so
     else { # SSL certificates are in place so  
     } # Leave the inittype alone.      } # Leave the inittype alone.
  }   }
   
Line 3563  sub make_new_child { Line 4185  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions  sub manage_permissions
 {  {
   
     my ($request, $domain, $user, $authtype) = @_;      my ($request, $domain, $user, $authtype) = @_;
Line 3576  sub ManagePermissions Line 4198  sub ManagePermissions
  system("$execdir/lchtmldir $userhome $user $authtype");   system("$execdir/lchtmldir $userhome $user $authtype");
     }      }
 }  }
   
   
   #
   #  Return the full path of a user password file, whether it exists or not.
   # Parameters:
   #   domain     - Domain in which the password file lives.
   #   user       - name of the user.
   # Returns:
   #    Full passwd path:
   #
   sub password_path {
       my ($domain, $user) = @_;
   
   
       my $path   = &propath($domain, $user);
       $path  .= "/passwd";
   
       return $path;
   }
   
   #   Password Filename
   #   Returns the path to a passwd file given domain and user... only if
   #  it exists.
   # Parameters:
   #   domain    - Domain in which to search.
   #   user      - username.
   # Returns:
   #   - If the password file exists returns its path.
   #   - If the password file does not exist, returns undefined.
   #
   sub password_filename {
       my ($domain, $user) = @_;
   
       Debug ("PasswordFilename called: dom = $domain user = $user");
   
       my $path  = &password_path($domain, $user);
       Debug("PasswordFilename got path: $path");
       if(-e $path) {
    return $path;
       } else {
    return undef;
       }
   }
   
   #
   #   Rewrite the contents of the user's passwd file.
   #  Parameters:
   #    domain    - domain of the user.
   #    name      - User's name.
   #    contents  - New contents of the file.
   # Returns:
   #   0    - Failed.
   #   1    - Success.
   #
   sub rewrite_password_file {
       my ($domain, $user, $contents) = @_;
   
       my $file = &password_filename($domain, $user);
       if (defined $file) {
    my $pf = IO::File->new(">$file");
    if($pf) {
       print $pf "$contents\n";
       return 1;
    } else {
       return 0;
    }
       } else {
    return 0;
       }
   
   }
   
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   get_auth_type - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType   sub get_auth_type 
 {  {
   
     my ($domain, $user)  = @_;      my ($domain, $user)  = @_;
   
     Debug("GetAuthType( $domain, $user ) \n");      Debug("get_auth_type( $domain, $user ) \n");
     my $proname    = &propath($domain, $user);       my $proname    = &propath($domain, $user); 
     my $passwdfile = "$proname/passwd";      my $passwdfile = "$proname/passwd";
     if( -e $passwdfile ) {      if( -e $passwdfile ) {
Line 3602  sub GetAuthType Line 4296  sub GetAuthType
  }   }
   
  return "$authtype:$availinfo";   return "$authtype:$availinfo";
     }      } else {
     else {  
  Debug("Returning nouser");   Debug("Returning nouser");
  return "nouser";   return "nouser";
     }      }
 }  }
   
   #
   #  Validate a user given their domain, name and password.  This utility
   #  function is used by both  AuthenticateHandler and ChangePasswordHandler
   #  to validate the login credentials of a user.
   # Parameters:
   #    $domain    - The domain being logged into (this is required due to
   #                 the capability for multihomed systems.
   #    $user      - The name of the user being validated.
   #    $password  - The user's propoposed password.
   #
   # Returns:
   #     1        - The domain,user,pasword triplet corresponds to a valid
   #                user.
   #     0        - The domain,user,password triplet is not a valid user.
   #
   sub validate_user {
       my ($domain, $user, $password) = @_;
   
   
       # Why negative ~pi you may well ask?  Well this function is about
       # authentication, and therefore very important to get right.
       # I've initialized the flag that determines whether or not I've 
       # validated correctly to a value it's not supposed to get.
       # At the end of this function. I'll ensure that it's not still that
       # value so we don't just wind up returning some accidental value
       # as a result of executing an unforseen code path that
       # did not set $validated.
   
       my $validated = -3.14159;
   
       #  How we authenticate is determined by the type of authentication
       #  the user has been assigned.  If the authentication type is
       #  "nouser", the user does not exist so we will return 0.
   
       my $contents = &get_auth_type($domain, $user);
       my ($howpwd, $contentpwd) = split(/:/, $contents);
   
       my $null = pack("C",0); # Used by kerberos auth types.
   
       if ($howpwd ne 'nouser') {
   
    if($howpwd eq "internal") { # Encrypted is in local password file.
       $validated = (crypt($password, $contentpwd) eq $contentpwd);
    }
    elsif ($howpwd eq "unix") { # User is a normal unix user.
       $contentpwd = (getpwnam($user))[1];
       if($contentpwd) {
    if($contentpwd eq 'x') { # Shadow password file...
       my $pwauth_path = "/usr/local/sbin/pwauth";
       open PWAUTH,  "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$user\n$password\n";
       close PWAUTH;
       $validated = ! $?;
   
    } else {         # Passwords in /etc/passwd. 
       $validated = (crypt($password,
    $contentpwd) eq $contentpwd);
    }
       } else {
    $validated = 0;
       }
    }
    elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
       if(! ($password =~ /$null/) ) {
    my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
      "",
      $contentpwd,,
      'krbtgt',
      $contentpwd,
      1,
      $password);
    if(!$k4error) {
       $validated = 1;
    } else {
       $validated = 0;
       &logthis('krb4: '.$user.', '.$contentpwd.', '.
        &Authen::Krb4::get_err_txt($Authen::Krb4::error));
    }
       } else {
    $validated = 0; # Password has a match with null.
       }
    } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
       if(!($password =~ /$null/)) { # Null password not allowed.
    my $krbclient = &Authen::Krb5::parse_name($user.'@'
     .$contentpwd);
    my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
    my $krbserver  = &Authen::Krb5::parse_name($krbservice);
    my $credentials= &Authen::Krb5::cc_default();
    $credentials->initialize($krbclient);
    my $krbreturn  = &Authen::KRb5::get_in_tkt_with_password($krbclient,
    $krbserver,
    $password,
    $credentials);
    $validated = ($krbreturn == 1);
       } else {
    $validated = 0;
       }
    } elsif ($howpwd eq "localauth") { 
       #  Authenticate via installation specific authentcation method:
       $validated = &localauth::localauth($user, 
          $password, 
          $contentpwd);
    } else { # Unrecognized auth is also bad.
       $validated = 0;
    }
       } else {
    $validated = 0;
       }
       #
       #  $validated has the correct stat of the authentication:
       #
   
       unless ($validated != -3.14159) {
    die "ValidateUser - failed to set the value of validated";
       }
       return $validated;
   }
   
   
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
Line 3854  sub make_passwd_file { Line 4667  sub make_passwd_file {
  return "no_priv_account_error\n";   return "no_priv_account_error\n";
     }      }
   
     my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
   
       my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
     {      {
  &Debug("Executing external: ".$execpath);   &Debug("Executing external: ".$execpath);
  &Debug("user  = ".$uname.", Password =". $npass);   &Debug("user  = ".$uname.", Password =". $npass);
Line 3862  sub make_passwd_file { Line 4677  sub make_passwd_file {
  print $se "$uname\n";   print $se "$uname\n";
  print $se "$npass\n";   print $se "$npass\n";
  print $se "$npass\n";   print $se "$npass\n";
    print $se "$lc_error_file\n"; # Status -> unique file.
     }      }
     my $useraddok = $?;      my $error = IO::File->new("< $lc_error_file");
       my $useraddok = <$error>;
       $error->close;
       unlink($lc_error_file);
   
       chomp $useraddok;
   
     if($useraddok > 0) {      if($useraddok > 0) {
  &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));   my $error_text = &lcuseraddstrerror($useraddok);
    &logthis("Failed lcuseradd: $error_text");
    $result = "lcuseradd_failed:$error_text\n";
       }  else {
    my $pf = IO::File->new(">$passfilename");
    print $pf "unix:\n";
     }      }
     my $pf = IO::File->new(">$passfilename");  
     print $pf "unix:\n";  
  }   }
     } elsif ($umode eq 'none') {      } elsif ($umode eq 'none') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new("> $passfilename");
     print $pf "none:\n";      print $pf "none:\n";
  }   }
     } else {      } else {
Line 4201  Place in B<logs/lond.log> Line 5026  Place in B<logs/lond.log>
   
 stores hash in namespace  stores hash in namespace
   
 =item rolesput  =item rolesputy
   
 put a role into a user's environment  put a role into a user's environment
   
Removed from v.1.212  
changed lines
  Added in v.1.232

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