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- let user know what we are doing when we are loading the remote, also provide a link to disable the remote control, should addres BUG#3572 and related

    1: # The LearningOnline Network
    2: # User Authentication Module
    3: #
    4: # $Id: lonauth.pm,v 1.63 2004/10/28 16:25:19 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: # 5/21/99,5/22,5/25,5/26,5/27,5/29,6/2,6/11,6/14,6/15
   29: # 16/11,12/16,
   30: # 1/14,2/24,2/28,2/29,3/7,5/29,5/30,5/31,6/1,6/5,6/29,
   31: # 7/1,7/10,10/2,10/5,10/9,10/26,10/30,11/10,
   32: # 05/28,05/29 Gerd Kortemeyer
   33: # 07/28,08/03 Gerd Kortemeyer
   34: # 8/20 Gerd Kortemeyer
   35: 
   36: package Apache::lonauth;
   37: 
   38: use strict;
   39: use Apache::Constants qw(:common);
   40: use Apache::File;
   41: use CGI qw(:standard);
   42: use CGI::Cookie();
   43: use DynaLoader; # for Crypt::DES version
   44: use Crypt::DES;
   45: use Apache::loncommon();
   46: use Apache::lonnet();
   47: use Apache::lonmenu();
   48: use Fcntl qw(:flock);
   49: use Apache::lonlocal;
   50: 
   51: my %FORM;
   52: 
   53: # ------------------------------------------------------------ Successful login
   54: 
   55: sub success {
   56:     my ($r, $username, $domain, $authhost,$lowerurl) = @_;
   57:     my $lonids=$r->dir_config('lonIDsDir');
   58: 
   59: # See if old ID present, if so, remove
   60: 
   61:     my $filename;
   62:     opendir(DIR,$lonids);
   63:     while ($filename=readdir(DIR)) {
   64:        if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {
   65: 	  unlink($lonids.'/'.$filename);
   66:        }
   67:     }
   68:     closedir(DIR);
   69: 
   70: # Give them a new cookie
   71: 
   72:     my $cookie;
   73:     my $now=time;
   74:     $cookie="$username\_$now\_$domain\_$authhost";
   75: 
   76: # Initialize roles
   77: 
   78:     my $userroles=Apache::lonnet::rolesinit($domain,$username,$authhost);
   79: 
   80: # ------------------------------------ Check browser type and MathML capability
   81: 
   82:     my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,
   83:         $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);
   84: 
   85: # -------------------------------------- Any accessibility options to remember?
   86:     if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {
   87: 	foreach ('imagesuppress','appletsuppress',
   88: 		 'embedsuppress','fontenhance','blackwhite') {
   89: 	    if ($FORM{$_} eq 'true') {
   90: 		&Apache::lonnet::put('environment',{$_ => 'on'},
   91: 				     $domain,$username);
   92: 	    } else {
   93: 		&Apache::lonnet::del('environment',[$_],$domain,$username);
   94: 	    }
   95: 	}
   96:     }
   97: # ------------------------------------------------------------- Get environment
   98: 
   99:     my $userenv;
  100:     my %userenv=Apache::lonnet::dump('environment',$domain,$username);
  101:     my ($tmp) = keys(%userenv);
  102:     if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
  103: 	foreach my $key (keys(%userenv)) {
  104: 	    $userenv.="environment.$key=$userenv{$key}\n";
  105: 	}
  106:     }
  107:     if (($userenv{'interface'}) && (!$FORM{'interface'})) {
  108: 	$FORM{'interface'}=$userenv{'interface'};
  109:     }
  110:     $ENV{'environment.remote'}=$userenv{'remote'};
  111: # --------------- Do not trust query string to be put directly into environment
  112:     foreach ('imagesuppress','appletsuppress',
  113: 	     'embedsuppress','fontenhance','blackwhite',
  114: 	     'interface','localpath','localres') {
  115: 	$FORM{$_}=~s/[\n\r\=]//gs;
  116:     }
  117: # --------------------------------------------------------- Write first profile
  118: 
  119:     {
  120: 	my $idf=Apache::File->new(">$lonids/$cookie.id");
  121: 	unless (flock($idf,LOCK_EX)) {
  122: 	    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
  123: 			   'Could not obtain exclusive lock in lonauth: '.$!);
  124: 	    $idf->close();
  125: 	    return 'error: '.$!;
  126: 	}
  127: 	if ($userenv ne '') { print $idf "$userenv\n"; }
  128: 	print $idf "user.name=$username\n";
  129: 	print $idf "user.domain=$domain\n";
  130: 	print $idf "user.home=$authhost\n";
  131: 	print $idf "browser.type=$clientbrowser\n";
  132: 	print $idf "browser.version=$clientversion\n";
  133: 	print $idf "browser.mathml=$clientmathml\n";
  134: 	print $idf "browser.unicode=$clientunicode\n";
  135: 	print $idf "browser.os=$clientos\n";
  136:         if ($FORM{'localpath'}) {
  137:            print $idf "browser.localpath=$FORM{'localpath'}\n";
  138:            print $idf "browser.localres=$FORM{'localres'}\n";
  139:         }
  140: 	print $idf "request.course.fn=\n";
  141: 	print $idf "request.course.uri=\n";
  142: 	print $idf "request.course.sec=\n";
  143: 	print $idf "request.role=cm\n";
  144:         print $idf "request.role.adv=$ENV{'user.adv'}\n";
  145: 	print $idf "request.host=$ENV{'REMOTE_ADDR'}\n";
  146: 	if ($FORM{'interface'}) {
  147: 	    $FORM{'interface'}=~s/\W//gs;
  148: 	    print $idf "browser.interface=$FORM{'interface'}\n";
  149: 	    $ENV{'browser.interface'}=$FORM{'interface'};
  150: 	    foreach ('imagesuppress','appletsuppress',
  151: 		     'embedsuppress','fontenhance','blackwhite') {
  152: 		if (($FORM{$_} eq 'true') ||
  153: 		    ($userenv{$_} eq 'on')) {
  154: 		    print $idf "browser.$_=on\n";
  155: 		}
  156: 	    }
  157: 	}
  158: 	if ($userroles ne '') { print $idf "$userroles"; }
  159: 	$idf->close();
  160:     }
  161:     $ENV{'request.role'}='cm';
  162:     $ENV{'request.role.adv'}=$ENV{'user.adv'};
  163:     $ENV{'browser.type'}=$clientbrowser;
  164: # -------------------------------------------------------------------- Log this
  165: 
  166:     &Apache::lonnet::log($domain,$username,$authhost,
  167:                          "Login $ENV{'REMOTE_ADDR'}");
  168: 
  169: # ------------------------------------------------- Check for critical messages
  170: 
  171:     my @what=&Apache::lonnet::dump('critical',$domain,$username);
  172:     if ($what[0]) {
  173: 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
  174: 	    $lowerurl='/adm/email?critical=display';
  175:         }
  176:     }
  177: 
  178: # ------------------------------------------------------------ Get cookie ready
  179: 
  180:     $cookie="lonID=$cookie; path=/";
  181: # -------------------------------------------------------- Menu script and info
  182:     my $windowinfo=&Apache::lonmenu::open($clientos);
  183:     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
  184:     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
  185:     my $setflags=&Apache::lonmenu::setflags();
  186:     my $maincall=&Apache::lonmenu::maincall();
  187:     my $bodytag=&Apache::loncommon::bodytag('Successful Login');
  188:     my $add=&addcontent();
  189: # ------------------------------------------------- Output for successful login
  190: 
  191:     $r->send_cgi_header(<<ENDHEADER);
  192: Content-type: text/html$add
  193: Set-cookie: $cookie
  194: 
  195: ENDHEADER
  196:     my %lt=&Apache::lonlocal::texthash(
  197: 				       'wel' => 'Welcome',
  198: 				       'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
  199: 				       'pro' => 'Problems',
  200: 				       'log' => 'loginproblems.html',
  201: 				       );
  202:     $r->print(<<ENDSUCCESS);
  203: <html>
  204: <head>
  205: <title>Successful Login to the LearningOnline Network with CAPA</title>
  206: $startupremote
  207: </head>
  208: $bodytag
  209: $setflags
  210: $windowinfo
  211: <h1>$lt{'wel'}</h1>
  212: $lt{'mes'}.<p>
  213: <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
  214: $remoteinfo
  215: $maincall
  216: </body>
  217: </html>
  218: ENDSUCCESS
  219: }
  220: 
  221: # --------------------------------------------------------------- Failed login!
  222: 
  223: sub failed {
  224:     my ($r,$message) = @_;
  225:     my $bodytag=&Apache::loncommon::bodytag('Unsuccessful Login');
  226:     my $add=&addcontent();
  227:     $r->send_cgi_header(<<ENDFHEADER);
  228: Content-type: text/html$add
  229: 
  230: ENDFHEADER
  231:     $r->print(<<ENDFAILED);
  232: <html>
  233: <head>
  234: <title>Unsuccessful Login to the LearningOnline Network with CAPA</title>
  235: </head>
  236: $bodytag
  237: <h1>Sorry ...</h1>
  238: <p><b>$message</b></p>
  239: <p>Please <a href="/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}">log in again</a>.</p>
  240: <p>
  241: <a href="/adm/loginproblems.html">Problems?</a></p>
  242: </body>
  243: </html>
  244: ENDFAILED
  245: }
  246: 
  247: # --------------------------------------------------------------------- Charset
  248: 
  249: sub addcontent {
  250:     my $encoding=&Apache::lonlocal::current_encoding;
  251:     if ($encoding) {
  252: 	return '; charset='.$encoding;
  253:     } else {
  254: 	return '';
  255:     }
  256: }
  257: 
  258: # ------------------------------------------------------------------ Rerouting!
  259: 
  260: sub reroute {
  261:     my $r=shift;
  262:     my $bodytag=&Apache::loncommon::bodytag('Rerouting');
  263:     $r->send_cgi_header(<<ENDRFHEADER);
  264: Content-type: text/html
  265: 
  266: ENDRFHEADER
  267:     $r->print(<<ENDRFAILED);
  268: <html>
  269: <head>
  270: <title>Rerouting Login to the LearningOnline Network with CAPA</title>
  271: </head>
  272: $bodytag
  273: <h1>Sorry ...</h1>
  274: Please <a href="/">log in again</a>.
  275: </body>
  276: </html>
  277: ENDRFAILED
  278: }
  279: 
  280: # ---------------------------------------------------------------- Main handler
  281: 
  282: sub handler {
  283:     my $r = shift;
  284: 
  285: # Are we re-routing?
  286:     if (-e '/home/httpd/html/lon-status/reroute.txt') {
  287: 	&reroute($r);
  288: 	return OK;
  289:     }
  290: 
  291:     &Apache::lonlocal::get_language_handle($r);
  292: 
  293: # -------------------------------- Prevent users from attempting to login twice
  294:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
  295:     my $lonid=$cookies{'lonID'};
  296:     my $cookie;
  297:     if ($lonid) {
  298: 	my $handle=$lonid->value;
  299:         $handle=~s/\W//g;
  300:         my $lonidsdir=$r->dir_config('lonIDsDir');
  301:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
  302: # Indeed, a valid token is found
  303: 	    $r->send_cgi_header(<<ENDFHEADER);
  304: Content-type: text/html
  305: 
  306: ENDFHEADER
  307: 	    my $bodytag=&Apache::loncommon::bodytag('Already logged in');
  308: 	    $r->print(<<ENDFAILED);
  309: <html>
  310: <head>
  311: <title>Already logged in</title>
  312: </head>
  313: $bodytag
  314: <h1>You are already logged in</h1>
  315: <p>Please either <a href="/adm/roles">continue the current session</a> or
  316: <a href="/adm/logout">logout</a>.</p>
  317: <p>
  318: <a href="/adm/loginproblems.html">Problems?</a></p>
  319: </body>
  320: </html>
  321: ENDFAILED
  322:            return OK;
  323: 	}
  324:     }
  325: 
  326: # ---------------------------------------------------- No valid token, continue
  327: 
  328: 
  329:     my $buffer;
  330:     $r->read($buffer,$r->header_in('Content-length'),0);
  331:     my @pairs=split(/&/,$buffer);
  332:     my $pair; my $name; my $value;
  333:     undef %FORM;
  334:     %FORM=();
  335:     foreach $pair (@pairs) {
  336:        ($name,$value) = split(/=/,$pair);
  337:        $value =~ tr/+/ /;
  338:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
  339:        $FORM{$name}=$value;
  340:     } 
  341: 
  342:     if ((!$FORM{'uname'}) || (!$FORM{'upass'}) || (!$FORM{'udom'})) {
  343: 	failed($r,'Username, password and domain need to be specified.');
  344:         return OK;
  345:     }
  346: 
  347: # split user logging in and "su"-user
  348: 
  349:     ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
  350:     $FORM{'uname'} =~ s/\W//g;
  351:     $FORM{'suname'} =~ s/\W//g;
  352:     $FORM{'udom'}  =~ s/\W//g;
  353: 
  354:     my $role   = $r->dir_config('lonRole');
  355:     my $domain = $r->dir_config('lonDefDomain');
  356:     my $prodir = $r->dir_config('lonUsersDir');
  357: 
  358: # ---------------------------------------- Get the information from login token
  359: 
  360:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
  361:                                       $FORM{'serverid'});
  362: 
  363:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
  364: 	failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
  365:         return OK;
  366:     } else {
  367:         unless (&Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
  368:                                          $FORM{'serverid'}) eq 'ok') {
  369:             &failed($r,'Session could not be opened.');
  370: 	}
  371:     }
  372:     my ($key,$firsturl)=split(/&/,$tmpinfo);
  373: 
  374:     my $keybin=pack("H16",$key);
  375: 
  376:     my $cipher;
  377:     if ($Crypt::DES::VERSION>=2.03) {
  378: 	$cipher=new Crypt::DES $keybin;
  379:     }
  380:     else {
  381: 	$cipher=new DES $keybin;
  382:     }
  383: 
  384:     my $upass=$cipher->decrypt(
  385:        unpack("a8",pack("H16",substr($FORM{'upass'},0,16))));
  386: 
  387:     $upass.=$cipher->decrypt(
  388:        unpack("a8",pack("H16",substr($FORM{'upass'},16,16))));
  389: 
  390:     $upass=substr($upass,1,ord(substr($upass,0,1)));
  391: 
  392: # ---------------------------------------------------------------- Authenticate
  393:     my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
  394:                                               $upass,
  395:                                               $FORM{'udom'});
  396:     
  397: # --------------------------------------------------------------------- Failed?
  398: 
  399:     if ($authhost eq 'no_host') {
  400: 	failed($r,'Username and/or password could not be authenticated.');
  401:         return OK;
  402:     }
  403: 
  404:     if (($firsturl eq '') || 
  405: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
  406: 	$firsturl='/adm/roles';
  407:     }
  408: # --------------------------------- Are we attempting to login as somebody else?
  409:     if ($FORM{'suname'}) {
  410: # ------------ see if the original user has enough privileges to pull this stunt
  411: 	if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
  412: # ---------------------------------------------------- see if the su-user exists
  413: 	    unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
  414: 		eq 'no_host') {
  415: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
  416: # ------------------------------ see if the su-user is not too highly privileged
  417: 		unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
  418: # -------------------------------------------------------- actually switch users
  419: 		    &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
  420: 			' logging in as '.$FORM{'suname'});
  421: 		    $FORM{'uname'}=$FORM{'suname'};
  422: 		} else {
  423: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
  424: 		}
  425: 	    }
  426: 	} else {
  427: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
  428: 	}
  429:     }
  430:     &success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
  431:     return OK;
  432: }
  433: 
  434: 1;
  435: __END__
  436: 
  437: