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[LON-CAPA] /
loncom /
auth /
lonauth.pm
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1.109:
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Wed Aug 25 16:34:32 2010 UTC (13 years, 11 months ago) by
raeburn
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- Offloading from a busy server delayed until after authentication so
user's domain is available when determining which less loaded server
will host (check that hosting is allowed).
1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.109 2010/08/25 16:34:32 raeburn 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:
29: package Apache::lonauth;
30:
31: use strict;
32: use LONCAPA;
33: use Apache::Constants qw(:common);
34: use CGI qw(:standard);
35: use DynaLoader; # for Crypt::DES version
36: use Crypt::DES;
37: use Apache::loncommon();
38: use Apache::lonnet;
39: use Apache::lonmenu();
40: use Apache::createaccount;
41: use Fcntl qw(:flock);
42: use Apache::lonlocal;
43: use Apache::File ();
44: use HTML::Entities;
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form) = @_;
50:
51: # ------------------------------------------------------------ Get cookie ready
52: my $cookie =
53: &Apache::loncommon::init_user_environment($r, $username, $domain,
54: $authhost, $form,
55: {'extra_env' => $extra_env,});
56:
57: my $public=($username eq 'public' && $domain eq 'public');
58:
59: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
60:
61: # -------------------------------------------------------------------- Log this
62:
63: &Apache::lonnet::log($domain,$username,$authhost,
64: "Login $ENV{'REMOTE_ADDR'}");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: my @what=&Apache::lonnet::dump('critical',$domain,$username);
69: if ($what[0]) {
70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
71: $lowerurl='/adm/email?critical=display';
72: }
73: }
74:
75: # ------------------------------------------------------------ Get cookie ready
76: $cookie="lonID=$cookie; path=/";
77: # -------------------------------------------------------- Menu script and info
78: my $destination = $lowerurl;
79:
80: if (defined($form->{role})) {
81: my $envkey = 'user.role.'.$form->{role};
82: my $now=time;
83: my $then=$env{'user.login.time'};
84: my $refresh=$env{'user.refresh.time'};
85: if (exists($env{$envkey})) {
86: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
87: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
88: \$trolecode,\$tstatus,\$tstart,\$tend);
89: if ($tstatus eq 'is') {
90: $destination .= ($destination =~ /\?/) ? '&' : '?';
91: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
92: $destination .= 'selectrole=1&'.$newrole.'=1';
93: }
94: }
95: }
96: if (defined($form->{symb})) {
97: my $destsymb = $form->{symb};
98: $destination .= ($destination =~ /\?/) ? '&' : '?';
99: if ($destsymb =~ /___/) {
100: # FIXME Need to deal with encrypted symbs and urls as needed.
101: my ($map,$resid,$desturl)=split(/___/,$destsymb);
102: unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
103: $desturl = &Apache::lonnet::clutter($desturl);
104: }
105: $desturl = &HTML::Entities::encode($desturl,'"<>&');
106: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
107: $destination .= '&destinationurl='.$desturl.
108: '&destsymb='.$destsymb;
109: } else {
110: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
111: $destination .= '&destinationurl='.$destsymb;
112: }
113: }
114:
115: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
116: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
117: my $brcrum = [{'href' => '',
118: 'text' => 'Successful Login'},];
119: my $start_page=&Apache::loncommon::start_page('Successful Login',
120: $header,
121: {'bread_crumbs' => $brcrum,});
122: my $end_page =&Apache::loncommon::end_page();
123:
124: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
125: # ------------------------------------------------- Output for successful login
126:
127: &Apache::loncommon::content_type($r,'text/html');
128: $r->header_out('Set-cookie' => $cookie);
129: $r->send_http_header;
130:
131: my %lt=&Apache::lonlocal::texthash(
132: 'wel' => 'Welcome',
133: 'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',
134: 'pro' => 'Login problems?',
135: 'log' => 'loginproblems.html',
136: );
137: $r->print(<<ENDSUCCESS);
138: $start_page
139: $windowinfo
140: <h1>$lt{'wel'}</h1>
141: $lt{'mes'}<p>
142: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
143: $continuelink
144: $end_page
145: ENDSUCCESS
146: }
147:
148: # --------------------------------------------------------------- Failed login!
149:
150: sub failed {
151: my ($r,$message,$form) = @_;
152: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
153: my $retry = '/adm/login?username='.$form->{'uname'}.
154: '&domain='.$form->{'udom'};
155: if (exists($form->{role})) {
156: $retry .= '&role='.$form->{role};
157: }
158: if (exists($form->{symb})) {
159: $retry .= '&symb='.$form->{symb};
160: }
161: my $end_page = &Apache::loncommon::end_page();
162: &Apache::loncommon::content_type($r,'text/html');
163: $r->send_http_header;
164: $r->print(
165: $start_page
166: .'<h1>'.&mt('Sorry ...').'</h1>'
167: .'<p class="LC_warning">'.&mt($message).'</p>'
168: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
169: .'</p>'
170: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
171: .$end_page
172: );
173: }
174:
175: # ------------------------------------------------------------------ Rerouting!
176:
177: sub reroute {
178: my ($r) = @_;
179: &Apache::loncommon::content_type($r,'text/html');
180: $r->send_http_header;
181: my $msg='<h1>'.&mt('Sorry ...').'</h1>'
182: .&mt('Please [_1]log in again[_2].');
183: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
184: }
185:
186: # ---------------------------------------------------------------- Main handler
187:
188: sub handler {
189: my $r = shift;
190: my $form;
191: # Are we re-routing?
192: if (-e '/home/httpd/html/lon-status/reroute.txt') {
193: &reroute($r);
194: return OK;
195: }
196:
197: &Apache::lonlocal::get_language_handle($r);
198:
199: # -------------------------------- Prevent users from attempting to login twice
200: my $handle = &Apache::lonnet::check_for_valid_session($r);
201: if ($handle ne '') {
202: my $lonidsdir=$r->dir_config('lonIDsDir');
203: if ($handle=~/^publicuser\_/) {
204: # For "public user" - remove it, we apparently really want to login
205: unlink($r->dir_config('lonIDsDir')."/$handle.id");
206: } else {
207: # Indeed, a valid token is found
208: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
209: &Apache::loncommon::content_type($r,'text/html');
210: $r->send_http_header;
211: my $start_page =
212: &Apache::loncommon::start_page('Already logged in');
213: my $end_page =
214: &Apache::loncommon::end_page();
215: my $dest = '/adm/roles';
216: if ($env{'form.firsturl'} ne '') {
217: $dest = $env{'form.firsturl'};
218: }
219: $r->print(
220: $start_page
221: .'<h1>'.&mt('You are already logged in!').'</h1>'
222: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
223: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
224: .'</p>'
225: .$end_page
226: );
227: return OK;
228: }
229: }
230:
231: # ---------------------------------------------------- No valid token, continue
232:
233:
234: my $buffer;
235: if ($r->header_in('Content-length') > 0) {
236: $r->read($buffer,$r->header_in('Content-length'),0);
237: }
238: my %form;
239: foreach my $pair (split(/&/,$buffer)) {
240: my ($name,$value) = split(/=/,$pair);
241: $value =~ tr/+/ /;
242: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
243: $form{$name}=$value;
244: }
245:
246: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
247: &failed($r,'Username, password and domain need to be specified.',
248: \%form);
249: return OK;
250: }
251:
252: # split user logging in and "su"-user
253:
254: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
255: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
256: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
257: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
258:
259: my $role = $r->dir_config('lonRole');
260: my $domain = $r->dir_config('lonDefDomain');
261: my $prodir = $r->dir_config('lonUsersDir');
262: my $contact_name = &mt('LON-CAPA helpdesk');
263:
264: # ---------------------------------------- Get the information from login token
265:
266: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
267: $form{'serverid'});
268:
269: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
270: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
271: return OK;
272: } else {
273: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
274: $form{'serverid'});
275: if ( $reply ne 'ok' ) {
276: &failed($r,'Session could not be opened.',\%form);
277: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
278: return OK;
279: }
280: }
281:
282: if (!&Apache::lonnet::domain($form{'udom'})) {
283: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
284: return OK;
285: }
286:
287: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
288: if ($rolestr) {
289: $rolestr = &unescape($rolestr);
290: }
291: if ($symbstr) {
292: $symbstr= &unescape($symbstr);
293: }
294: if ($rolestr =~ /^role=/) {
295: (undef,$form{'role'}) = split('=',$rolestr);
296: }
297: if ($symbstr =~ /^symb=/) {
298: (undef,$form{'symb'}) = split('=',$symbstr);
299: }
300:
301: my $keybin=pack("H16",$key);
302:
303: my $cipher;
304: if ($Crypt::DES::VERSION>=2.03) {
305: $cipher=new Crypt::DES $keybin;
306: }
307: else {
308: $cipher=new DES $keybin;
309: }
310: my $upass='';
311: for (my $i=0;$i<=2;$i++) {
312: my $chunk=
313: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
314:
315: $chunk.=
316: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
317:
318: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
319: $upass.=$chunk;
320: }
321:
322: # ---------------------------------------------------------------- Authenticate
323: my @cancreate;
324: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
325: if (ref($domconfig{'usercreation'}) eq 'HASH') {
326: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
327: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
328: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
329: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
330: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
331: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
332: }
333: }
334: }
335: my $defaultauth;
336: if (grep(/^login$/,@cancreate)) {
337: $defaultauth = 1;
338: }
339: my $clientcancheckhost = 1;
340: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
341: $form{'udom'},$defaultauth,
342: $clientcancheckhost);
343:
344: # --------------------------------------------------------------------- Failed?
345:
346: if ($authhost eq 'no_host') {
347: &failed($r,'Username and/or password could not be authenticated.',
348: \%form);
349: return OK;
350: } elsif ($authhost eq 'no_account_on_host') {
351: my %domconfig =
352: &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
353: if (grep(/^login$/,@cancreate)) {
354: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
355: &check_can_host($r,\%form,'no_account_on_host',$domdesc);
356: my $start_page =
357: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
358: my $lonhost = $r->dir_config('lonHostID');
359: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
360: my $contacts =
361: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
362: $form{'udom'},$origmail);
363: my ($contact_email) = split(',',$contacts);
364: my $output = &Apache::createaccount::username_check($form{'uname'},
365: $form{'udom'},$domdesc,'',
366: $lonhost,$contact_email,$contact_name);
367: &Apache::loncommon::content_type($r,'text/html');
368: $r->send_http_header;
369: &Apache::createaccount::print_header($r,$start_page);
370: $r->print('<h3>'.&mt('Account creation').'</h3>'.
371: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
372: $output.&Apache::loncommon::end_page());
373: return OK;
374: } else {
375: &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
376: return OK;
377: }
378: }
379:
380: if (($firsturl eq '') ||
381: ($firsturl=~/^\/adm\/(logout|remote)/)) {
382: $firsturl='/adm/roles';
383: }
384: # --------------------------------- Are we attempting to login as somebody else?
385: if ($form{'suname'}) {
386: # ------------ see if the original user has enough privileges to pull this stunt
387: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
388: # ---------------------------------------------------- see if the su-user exists
389: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
390: eq 'no_host') {
391: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
392: # ------------------------------ see if the su-user is not too highly privileged
393: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
394: # -------------------------------------------------------- actually switch users
395: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
396: ' logging in as '.$form{'suname'});
397: $form{'uname'}=$form{'suname'};
398: } else {
399: &Apache::lonnet::logthis('Attempted switch user to privileged user');
400: }
401: }
402: } else {
403: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
404: }
405: }
406:
407: &check_can_host($r,\%form,$authhost);
408:
409: if ($r->dir_config("lonBalancer") eq 'yes') {
410: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
411: \%form);
412: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
413: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
414: } else {
415: # ------------------------------------------------------- Do the load balancing
416:
417: # ---------------------------------------------------------- Determine own load
418: my $loadlim = $r->dir_config('lonLoadLim');
419: my $loadavg;
420: {
421: my $loadfile=Apache::File->new('/proc/loadavg');
422: $loadavg=<$loadfile>;
423: }
424: $loadavg =~ s/\s.*//g;
425: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
426: my $userloadpercent=&Apache::lonnet::userload();
427:
428: # ---------------------------------------------------------- Are we overloaded?
429: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
430: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
431: if ($unloaded) {
432: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
433: undef,\%form);
434: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
435: }
436: }
437: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
438: \%form);
439: }
440: return OK;
441: }
442:
443: sub check_can_host {
444: my ($r,$form,$authhost,$domdesc) = @_;
445: return unless (ref($form) eq 'HASH');
446: my $canhost = 1;
447: my $lonhost = $r->dir_config('lonHostID');
448: my $udom = $form->{'udom'};
449: my @intdoms;
450: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
451: if (ref($internet_names) eq 'ARRAY') {
452: @intdoms = @{$internet_names};
453: }
454: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
455: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
456: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
457: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
458: my $hostname = &Apache::lonnet::hostname($lonhost);
459: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
460: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
461: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
462: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
463: my $loncaparev;
464: if ($authhost eq 'no_account_on_host') {
465: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
466: } else {
467: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
468: }
469: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
470: $udomdefaults{'remotesessions'},
471: $defdomdefaults{'hostedsessions'});
472: }
473: unless ($canhost) {
474: if ($authhost eq 'no_account_on_host') {
475: my ($login_host,$hostname) = &Apache::lonnet::choose_server($udom);
476: &Apache::loncommon::content_type($r,'text/html');
477: $r->send_http_header;
478: if ($login_host ne '') {
479: my $protocol = $Apache::lonnet::protocol{$login_host};
480: $protocol = 'http' if ($protocol ne 'https');
481: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
482: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
483: '<h3>'.&mt('Account creation').'</h3>'.
484: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
485: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
486: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
487: &Apache::loncommon::end_page());
488: } else {
489: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
490: '<h3>'.&mt('Account creation unavailable').'</h3>'.
491: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
492: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
493: &Apache::loncommon::end_page());
494: }
495: return OK;
496: } else {
497: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
498: $form);
499: my ($otherserver) = &Apache::lonnet::choose_server($udom);
500: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
501: }
502: }
503: }
504:
505: 1;
506: __END__
507:
508:
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