1: # The LearningOnline Network
2: # Switch Servers Handler
3: #
4: # $Id: switchserver.pm,v 1.46 2018/12/08 15:16:03 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::switchserver;
30:
31: use strict;
32: use Apache::Constants qw(:common);
33: use Apache::lonnet;
34: use Digest::MD5 qw(md5_hex);
35: use CGI::Cookie();
36: use Apache::lonlocal;
37: use LONCAPA qw(:DEFAULT :match);
38:
39: sub init_env {
40: my ($r) = @_;
41:
42: if (-e $env{'user.environment'}) {
43: return $env{'user.environment'};
44: }
45: my $requrl=$r->uri;
46: my $handle= &Apache::lonnet::check_for_valid_session($r);
47: if ($handle ne '') {
48: return undef;
49: }
50: my $lonidsdir=$r->dir_config('lonIDsDir');
51: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
52:
53: return $r->dir_config('lonIDsDir')."/$handle.id";
54: }
55:
56: sub do_redirect {
57: my ($r,$url,$only_body,$extra_text) = @_;
58: $r->send_http_header;
59: my $start_page =
60: &Apache::loncommon::start_page('Switching Server ...',undef,
61: {'redirect' => [0.5,$url],
62: 'only_body' => $only_body,});
63: my $end_page = &Apache::loncommon::end_page();
64: $r->print($start_page.$extra_text.$end_page);
65: unless ($env{'user.name'} eq 'public' && ($env{'user.domain'} eq 'public')) {
66: $r->register_cleanup(\&flush_course_logs);
67: }
68: return OK;
69: }
70:
71: sub balancer_cookieid {
72: my ($r,$desthost,$uname,$udom) = @_;
73: my @hosts = &Apache::lonnet::current_machine_ids();
74: my $newcookieid;
75: unless (grep(/^\Q$desthost\E$/,@hosts)) {
76: my $balancedir=$r->dir_config('lonBalanceDir');
77: $newcookieid = &md5_hex(&md5_hex(time.{}.rand().$$));
78: my $cookie = $udom.'_'.$uname.'_'.$newcookieid;
79: my $balcookie = "balanceID=$cookie; path=/; HttpOnly;";
80: if (open(my $fh,'>',"$balancedir/$cookie.id")) {
81: print $fh $desthost;
82: close($fh);
83: $r->headers_out->add('Set-cookie' => $balcookie);
84: }
85: }
86: return $newcookieid;
87: }
88:
89: sub flush_course_logs {
90: &Apache::lonnet::flushcourselogs();
91: return OK;
92: }
93:
94: sub handler {
95: my ($r) = @_;
96:
97: my $handle=&init_env($r);
98: if (!defined($handle)) { return FORBIDDEN; }
99:
100: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
101: ['otherserver','role','origurl','symb']);
102:
103: my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
104: if (! $env{'form.otherserver'}) {
105: $env{'form.otherserver'} =
106: &Apache::lonnet::find_existing_session($env{'user.domain'},
107: $env{'user.name'});
108: if (! $env{'form.otherserver'}) {
109: $env{'form.otherserver'} =
110: &Apache::lonnet::spareserver(30000,undef,1);
111: }
112: $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
113: }
114:
115: if (!defined($switch_to)) { return FORBIDDEN; }
116:
117: my $protocol = 'http';
118: if ($env{'form.otherserver'}) {
119: if ($Apache::lonnet::protocol{$env{'form.otherserver'}} eq 'https') {
120: $protocol = $Apache::lonnet::protocol{$env{'form.otherserver'}};
121: }
122: }
123:
124: if ($env{'user.name'} eq 'public'
125: && $env{'user.domain'} eq 'public') {
126: my $url = $protocol.'://'.$switch_to.$r->uri;
127: unlink($handle);
128: #expire the cookie
129: my $c = new CGI::Cookie(-name => 'lonPubID',
130: -value => '',
131: -expires => '-10y',);
132: $r->header_out('Set-cookie' => $c);
133: return &do_redirect($r,$url,1)
134: }
135:
136: my $skip_canhost_check = '';
137: my $now = time;
138: if ($env{'form.role'}) {
139: if (!exists($env{'user.role.'.$env{'form.role'}})) {
140: delete($env{'form.role'});
141: } else {
142: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
143: if (($start && $start > $now) || ($end && $end < $now)) {
144: delete($env{'form.role'});
145: } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
146: if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
147: $skip_canhost_check = 1;
148: }
149: } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)$}) {
150: my ($audom,$auname) = ($1,$2);
151: if (&Apache::lonnet::homeserver($auname,$audom) eq $env{'form.otherserver'}) {
152: if ((&Apache::lonnet::will_trust('othcoau',$env{'user.domain'},$audom)) &&
153: (&Apache::lonnet::will_trust('coaurem',$audom,$env{'user.domain'}))) {
154: $skip_canhost_check = 1;
155: }
156: }
157: }
158: }
159: }
160:
161: unless ($skip_canhost_check) {
162: my $canhost = 1;
163: my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
164: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
165: my @intdoms;
166: my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
167: if (ref($internet_names) eq 'ARRAY') {
168: @intdoms = @{$internet_names};
169: }
170: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
171: my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
172: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
173: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
174: my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
175: my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
176: $canhost =
177: &Apache::lonnet::can_host_session($env{'user.domain'},
178: $env{'form.otherserver'},
179: $remoterev,
180: $udomdefaults{'remotesessions'},
181: $defdomdefaults{'hostedsessions'});
182: }
183: unless ($canhost) { return FORBIDDEN; }
184: }
185:
186: #remove session env, and log event
187: if (unlink($handle)) {
188: if ($env{'user.linkedenv'} ne '') {
189: my $lonidsdir=$r->dir_config('lonIDsDir');
190: if (($env{'user.linkedenv'} =~ /^[a-f0-9]+_linked$/) &&
191: (-l "$lonidsdir/$env{'user.linkedenv'}.id") &&
192: (readlink("$lonidsdir/$env{'user.linkedenv'}.id") eq $handle)) {
193: unlink("$lonidsdir/$env{'user.linkedenv'}.id");
194: }
195: }
196: }
197: my %temp=('switchserver' => $now.':'.$env{'form.otherserver'},
198: $env{'form.role'});
199: &Apache::lonnet::put('email_status',\%temp);
200: my $logmsg = "Switch Server to $env{'form.otherserver'}";
201: if ($env{'form.role'}) {
202: $logmsg .= " with role: $env{'form.role'}";
203: } elsif (($env{'form.lti.reqcrs'}) && ($env{'form.lti.reqrole'} eq 'cc')) {
204: $logmsg .= " to create new LTI course";
205: } elsif ($env{'form.lti.selfenrollrole'}) {
206: $logmsg .= " to selfenroll with role: $env{'form.lti.selfenrollrole'}";
207: } else {
208: $logmsg .= " (no role)";
209: }
210: $logmsg .= ' '.$ENV{'REMOTE_ADDR'};
211: &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
212: $env{'user.home'},$logmsg);
213:
214: &Apache::loncommon::content_type($r,'text/html');
215:
216: #expire the cookies
217: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
218: foreach my $name (keys(%cookies)) {
219: next unless ($name =~ /^lon(|S|Link|Pub)ID$/);
220: my $c = new CGI::Cookie(-name => $name,
221: -value => '',
222: -expires => '-10y',);
223: $r->headers_out->add('Set-cookie' => $c);
224: }
225: if ($r->header_only) {
226: $r->send_http_header;
227: return OK;
228: }
229: # -------------------------------------------------------- Menu script and info
230:
231: # ---------------------------------------------------------------- Get handover
232:
233: my $newcookieid;
234: my ($is_balancer,$posshost,$setcookie,$offloadto,$dom_balancers) =
235: &Apache::lonnet::check_loadbalancing($env{'user.name'},$env{'user.domain'});
236: if ($is_balancer && $setcookie && $env{'form.otherserver'}) {
237:
238: # Set a balancer cookie unless browser already sent LON-CAPA load balancer
239: # cookie which points at the target server
240: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r,1);
241:
242: unless (($found_server eq $env{'form.otherserver'}) &&
243: ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
244: $newcookieid = &balancer_cookieid($r,$env{'form.otherserver'},
245: $env{'user.name'},$env{'user.domain'});
246: }
247: }
248:
249: my %info=('ip' => $ENV{'REMOTE_ADDR'},
250: 'domain' => $env{'user.domain'},
251: 'username' => $env{'user.name'},
252: 'home' => $env{'user.home'},
253: 'role' => $env{'form.role'},
254: 'server' => $r->dir_config('lonHostID'),
255: 'balancer' => $is_balancer,
256: 'dom_balancers' => $dom_balancers,
257: 'offloadto' => '');
258: if (ref($offloadto) eq 'HASH') {
259: foreach my $key (keys(%{$offloadto})) {
260: if (ref($offloadto->{$key}) eq 'ARRAY') {
261: $info{'offloadto'} .= $key.'='.join(',',@{$offloadto->{$key}}).'&';
262: }
263: }
264: $info{'offloadto'} =~ s/\&$//;
265: } elsif (ref($offloadto) eq 'ARRAY') {
266: $info{'offloadto'} = join(',',@{$offloadto});
267: }
268: if ($newcookieid) {
269: $info{'balcookie'} = $newcookieid;
270: }
271: if ($env{'form.origurl'}) {
272: $info{'origurl'} = $env{'form.origurl'};
273: }
274: if ($env{'form.symb'}) {
275: $info{'symb'} = $env{'form.symb'};
276: }
277: if ($env{'request.sso.login'}) {
278: $info{'sso.login'} = $env{'request.sso.login'};
279: }
280: if ($env{'request.sso.reloginserver'}) {
281: $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
282: }
283: if ($env{'request.lti.login'}) {
284: $info{'lti.login'} = $env{'request.lti.login'};
285: }
286: if ($env{'request.lti.uri'}) {
287: $info{'lti.uri'} = $env{'request.lti.uri'};
288: }
289: if ($env{'request.lti.reqcrs'}) {
290: $info{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
291: }
292: if ($env{'request.lti.reqrole'}) {
293: $info{'lti.reqrole'} = $env{'request.lti.reqrole'};
294: }
295: if ($env{'request.lti.selfenrollrole'}) {
296: $info{'lti.selfenrollrole'} = $env{'request.lti.selfenrollrole'};
297: }
298: if ($env{'request.lti.sourcecrs'}) {
299: $info{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
300: }
301: if ($env{'request.lti.passbackid'}) {
302: $info{'lti.passbackid'} = $env{'request.lti.passbackid'};
303: }
304: if ($env{'request.lti.passbackurl'}) {
305: $info{'lti.passbackurl'} = $env{'request.lti.passbackurl'};
306: }
307: if ($env{'request.lti.rosterid'}) {
308: $info{'lti.rosterid'} = $env{'request.lti.rosterid'};
309: }
310: if ($env{'request.lti.rosterurl'}) {
311: $info{'lti.rosterurl'} = $env{'request.lti.rosterurl'};
312: }
313: if ($env{'request.lti.target'}) {
314: $info{'lti.target'} = $env{'request.lti.target'};
315: }
316: my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
317: my $url =$protocol.'://'.$switch_to.'/adm/login?'.
318: 'domain='.$env{'user.domain'}.
319: '&username='.$env{'user.name'}.
320: '&token='.$token;
321: # --------------------------------------------------------------- Screen Output
322: return &do_redirect($r, $url, 0);
323: }
324:
325: 1;
326: __END__
327:
328:
329:
330:
331:
332:
333:
334:
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