1: # The LearningOnline Network
2: # Switch Servers Handler
3: #
4: # $Id: switchserver.pm,v 1.35.2.6.2.3 2022/08/30 16:20:17 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 :remotehost);
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,$write_to_opener) = @_;
58: $r->send_http_header;
59: my $delay = 0.5;
60: if ($only_body && !$extra_text) {
61: $delay = 0;
62: }
63: my $start_page =
64: &Apache::loncommon::start_page('Switching Server ...',undef,
65: {'redirect' => [$delay,$url,'',$write_to_opener],
66: 'only_body' => $only_body,});
67: my $end_page = &Apache::loncommon::end_page();
68: $r->print($start_page.$extra_text.$end_page);
69: unless ($env{'user.name'} eq 'public' && ($env{'user.domain'} eq 'public')) {
70: $r->register_cleanup(\&flush_course_logs);
71: }
72: return OK;
73: }
74:
75: sub balancer_cookieid {
76: my ($r,$desthost,$uname,$udom) = @_;
77: my @hosts = &Apache::lonnet::current_machine_ids();
78: my $newcookieid;
79: unless (grep(/^\Q$desthost\E$/,@hosts)) {
80: my $balancedir=$r->dir_config('lonBalanceDir');
81: $newcookieid = &md5_hex(&md5_hex(time.{}.rand().$$));
82: my $cookie = $udom.'_'.$uname.'_'.$newcookieid;
83: my $balcookie = "balanceID=$cookie; path=/; HttpOnly;";
84: if (open(my $fh,'>',"$balancedir/$cookie.id")) {
85: print $fh $desthost;
86: close($fh);
87: $r->headers_out->add('Set-cookie' => $balcookie);
88: }
89: }
90: return $newcookieid;
91: }
92:
93: sub flush_course_logs {
94: &Apache::lonnet::flushcourselogs();
95: return OK;
96: }
97:
98: sub handler {
99: my ($r) = @_;
100:
101: my $handle=&init_env($r);
102: if (!defined($handle)) { return FORBIDDEN; }
103:
104: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
105: ['otherserver','role','origurl','symb','lcssowin']);
106:
107: my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
108: if (! $env{'form.otherserver'}) {
109: $env{'form.otherserver'} =
110: &Apache::lonnet::find_existing_session($env{'user.domain'},
111: $env{'user.name'});
112: if (! $env{'form.otherserver'}) {
113: $env{'form.otherserver'} =
114: &Apache::lonnet::spareserver($r,30000,undef,1);
115: }
116: $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
117: }
118:
119: if (!defined($switch_to)) { return FORBIDDEN; }
120:
121: my $protocol = 'http';
122: if ($env{'form.otherserver'}) {
123: if ($Apache::lonnet::protocol{$env{'form.otherserver'}} eq 'https') {
124: $protocol = $Apache::lonnet::protocol{$env{'form.otherserver'}};
125: }
126: unless ($env{'form.otherserver'} eq $r->dir_config('lonHostID')) {
127: my $alias = &Apache::lonnet::use_proxy_alias($r,$env{'form.otherserver'});
128: $switch_to = $alias if ($alias ne '');
129: }
130: }
131:
132: if ($env{'user.name'} eq 'public'
133: && $env{'user.domain'} eq 'public') {
134: my $url = $protocol.'://'.$switch_to.$r->uri;
135: unlink($handle);
136: #expire the cookie
137: my $c = new CGI::Cookie(-name => 'lonPubID',
138: -value => '',
139: -expires => '-10y',);
140: $r->header_out('Set-cookie' => $c);
141: return &do_redirect($r,$url,1)
142: }
143:
144: my $skip_canhost_check = '';
145: my $now = time;
146: if ($env{'form.role'}) {
147: if (!exists($env{'user.role.'.$env{'form.role'}})) {
148: delete($env{'form.role'});
149: } else {
150: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
151: if (($start && $start > $now) || ($end && $end < $now)) {
152: delete($env{'form.role'});
153: } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
154: if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
155: $skip_canhost_check = 1;
156: }
157: } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)$}) {
158: if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
159: $skip_canhost_check = 1;
160: }
161: }
162: }
163: }
164:
165: unless ($skip_canhost_check) {
166: my $canhost = 1;
167: my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
168: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
169: my @intdoms;
170: my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
171: if (ref($internet_names) eq 'ARRAY') {
172: @intdoms = @{$internet_names};
173: }
174: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
175: my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
176: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
177: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
178: my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
179: my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
180: $canhost =
181: &Apache::lonnet::can_host_session($env{'user.domain'},
182: $env{'form.otherserver'},
183: $remoterev,
184: $udomdefaults{'remotesessions'},
185: $defdomdefaults{'hostedsessions'});
186: }
187: unless ($canhost) { return FORBIDDEN; }
188: }
189:
190: #remove session env, and log event
191: if (unlink($handle)) {
192: if ($env{'user.linkedenv'} ne '') {
193: my $lonidsdir=$r->dir_config('lonIDsDir');
194: if (($env{'user.linkedenv'} =~ /^[a-f0-9]+_linked$/) &&
195: (-l "$lonidsdir/$env{'user.linkedenv'}.id") &&
196: (readlink("$lonidsdir/$env{'user.linkedenv'}.id") eq $handle)) {
197: unlink("$lonidsdir/$env{'user.linkedenv'}.id");
198: }
199: }
200: }
201: my %temp=('switchserver' => $now.':'.$env{'form.otherserver'},
202: $env{'form.role'});
203: &Apache::lonnet::put('email_status',\%temp);
204: my $logmsg = "Switch Server to $env{'form.otherserver'}";
205: if ($env{'form.role'}) {
206: $logmsg .= " with role: $env{'form.role'}";
207: } else {
208: $logmsg .= " (no role)";
209: }
210: my $ip = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP);
211: $logmsg .= ' '.$ip;
212: &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
213: $env{'user.home'},$logmsg);
214:
215: &Apache::loncommon::content_type($r,'text/html');
216:
217: #expire the cookies
218: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
219: foreach my $name (keys(%cookies)) {
220: next unless ($name =~ /^lon(|S|Link|Pub)ID$/);
221: my $c = new CGI::Cookie(-name => $name,
222: -value => '',
223: -expires => '-10y',);
224: $r->headers_out->add('Set-cookie' => $c);
225: }
226: if ($r->header_only) {
227: $r->send_http_header;
228: return OK;
229: }
230: # -------------------------------------------------------- Menu script and info
231:
232: # ---------------------------------------------------------------- Get handover
233:
234: my ($is_balancer,$setcookie,$newcookieid,$otherbalcookie);
235: my $only_body = 0;
236: ($is_balancer,undef,$setcookie) =
237: &Apache::lonnet::check_loadbalancing($env{'user.name'},$env{'user.domain'},'switchserver');
238: if ($is_balancer && $setcookie && $env{'form.otherserver'}) {
239:
240: # Set a balancer cookie unless browser already sent LON-CAPA load balancer
241: # cookie which points at the target server
242: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r,1);
243:
244: if (($found_server eq $env{'form.otherserver'}) &&
245: ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
246: $only_body = 1;
247: } else {
248: $newcookieid = &balancer_cookieid($r,$env{'form.otherserver'},
249: $env{'user.name'},$env{'user.domain'});
250: }
251: }
252: if ((!$is_balancer) && ($env{'request.balancercookie'})) {
253: $otherbalcookie = $env{'request.balancercookie'};
254: }
255:
256: my %info=('ip' => $ip,
257: 'domain' => $env{'user.domain'},
258: 'username' => $env{'user.name'},
259: 'role' => $env{'form.role'},
260: 'server' => $r->dir_config('lonHostID'),
261: 'balancer' => $is_balancer);
262: if ($newcookieid) {
263: $info{'balcookie'} = $newcookieid;
264: } elsif ($otherbalcookie) {
265: $info{'otherbalcookie'} = $otherbalcookie;
266: }
267: if ($env{'form.origurl'}) {
268: $info{'origurl'} = $env{'form.origurl'};
269: }
270: if ($env{'form.symb'}) {
271: $info{'symb'} = $env{'form.symb'};
272: }
273: my $ssologoutscript = '';
274: my $write_to_opener;
275: if ($env{'request.sso.login'}) {
276: $info{'sso.login'} = $env{'request.sso.login'};
277: if (defined($r->dir_config("lonSSOUserLogoutScriptFile_$info{domain}"))) {
278: if (open(my $fh,'<',$r->dir_config("lonSSOUserLogoutScriptFile_$info{domain}"))) {
279: $ssologoutscript .= join('',<$fh>);
280: close($fh);
281: }
282: }
283: if (defined($r->dir_config('lonSSOUserLogoutScriptFile'))) {
284: if (open(my $fh,'<',$r->dir_config('lonSSOUserLogoutScriptFile'))) {
285: $ssologoutscript .= join('',<$fh>);
286: close($fh);
287: }
288: }
289: }
290: if ($env{'request.sso.reloginserver'}) {
291: $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
292: }
293: if ($env{'request.linkprot'}) {
294: $info{'linkprot'} = $env{'request.linkprot'};
295: foreach my $item ('linkprotuser','linkprotexit') {
296: if ($env{'request.'.$item}) {
297: $info{$item} = $env{'request.'.$item};
298: }
299: }
300: } elsif ($env{'request.linkkey'} ne '') {
301: $info{'linkkey'} = $env{'request.linkkey'};
302: }
303: if ($env{'request.deeplink.login'}) {
304: $info{'deeplink.login'} = $env{'request.deeplink.login'};
305: }
306: my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
307: my @args = ("domain=$env{'user.domain'}",
308: "username=$env{'user.name'}",
309: "token=$token");
310: my $url = $protocol.'://'.$switch_to.'/adm/login?';
311: if ($env{'form.lcssowin'}) {
312: $url .= join('&',@args);
313: $only_body = 1;
314: } else {
315: $url .= join('&',@args);
316: }
317: # --------------------------------------------------------------- Screen Output
318: return &do_redirect($r, $url, $only_body, $ssologoutscript, $env{'form.lcssowin'});
319: }
320:
321: 1;
322: __END__
323:
324:
325:
326:
327:
328:
329:
330:
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