Annotation of loncom/cgi/lonauthcgi.pm, revision 1.2
1.1 raeburn 1: #
2: # LON-CAPA authorization for cgi-bin scripts
3: #
1.2 ! raeburn 4: # $Id: lonauthcgi.pm,v 1.1 2008/12/25 01:51:03 raeburn Exp $
1.1 raeburn 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: #############################################
30:
31: =pod
32:
33: =head1 NAME
34:
35: loncgi
36:
37: =head1 SYNOPSIS
38:
39: Provides subroutines for checking if access to cgi pages is allowed
40: based on IP address, or for logged-in users based on role and/or
41: identity. Also provides subroutines to give a user an explanation
42: when access is denied, and descriptions of various server status pages
43: generated by CGI scripts which use these subroutines for authorization.
44:
45: =head1 Subroutines
46:
47: =over 4
48:
49: =cut
50:
51: #############################################
52: #############################################
53:
54: package LONCAPA::lonauthcgi;
55:
56: use strict;
57: use lib '/home/httpd/lib/perl';
58: use Apache::lonnet;
59: use Apache::lonlocal;
60: use LONCAPA;
61:
62: #############################################
63: #############################################
64:
65: =pod
66:
67: =item check_ipbased_access()
68:
69: Inputs: $page, the identifier of the page to be viewed,
70: can be one of the keys in the hash from &serverstatus_titles()
71:
72: $ip, the IP address of the client requesting the page.
73:
74: Returns: 1 if access is permitted for the requestor's IP.
75: Access is allowed if on of the following is true:
76: (a) the requestor IP is the loopback address
77: (b) Domain configurations for domains hosted on this server include
78: the requestor's IP as one of the specified IPs with access
79: to this page. (does not apply to 'ping' page type)
80:
81: =cut
82:
83: #############################################
84: #############################################
85: sub check_ipbased_access {
86: my ($page,$ip) = @_;
87: my $allowed;
88: if (!defined($ip)) {
89: $ip = $ENV{'REMOTE_ADDR'};
90: }
91: if (($page ne 'lonstatus') && ($page ne 'serverstatus')) {
92: if ($ip eq '127.0.0.1') {
93: $allowed = 1;
94: return $allowed;
95: }
96: }
97: if ($page ne 'ping') {
98: my @poss_domains = &Apache::lonnet::current_machine_domains();
99: foreach my $dom (@poss_domains) {
100: my %domconfig = &Apache::lonnet::get_dom('configuration',['serverstatuses'],$dom);
101: if (ref($domconfig{'serverstatuses'}) eq 'HASH') {
102: if (ref($domconfig{'serverstatuses'}{$page}) eq 'HASH') {
103: if ($domconfig{'serverstatuses'}{$page}{'machines'} ne '') {
104: my @okmachines = split(/,/,$domconfig{'serverstatuses'}{$page}{'machines'});
105: if (grep(/^\Q$ip\E$/,@okmachines)) {
106: $allowed = 1;
107: last;
108: }
109: }
110: }
111: }
112: }
113: }
114: return $allowed;
115: }
116:
117: #############################################
118: #############################################
119:
120: =pod
121:
122: =item can_view()
123:
124: Inputs: $page, the identifier of the page to be viewed,
125: can be one of the keys in the hash from &serverstatus_titles()
126:
127: Returns: 1 if access to the page is permitted.
128: Access allowed if one of the following is true:
129: (a) Requestor has LON-CAPA superuser role
130: (b) Requestor's role is Domain Coordinator in one of the domains
131: hosted on this server
132: (c) Domain configurations for domains hosted on this server include
133: the requestor as one of the named users (username:domain) with access
134: to the page.
135:
136: In the case of requests for the 'ping' page, and access is also allowed if
137: at least one domain hosted on requestor's server is also hosted on this server.
138:
139: =cut
140:
141: #############################################
142: #############################################
143: sub can_view {
144: my ($page) = @_;
145: my $allowed;
146: if ($Apache::lonnet::env{'request.role'} =~ m{^su\./}) {
147: $allowed = 1;
148: } elsif ($page eq 'ping') {
149: my @poss_domains = &Apache::lonnet::current_machine_domains();
150: my @hostids= &Apache::lonnet::get_hosts_from_ip($ENV{'REMOTE_ADDR'});
151: foreach my $hostid (@hostids) {
152: my $hostdom = &Apache::lonnet::host_domain($hostid);
153: if (grep(/^\Q$hostdom\E$/,@poss_domains)) {
154: $allowed = 1;
155: last;
156: }
157: }
158: } else {
159: my @poss_domains = &Apache::lonnet::current_machine_domains();
160: foreach my $dom (@poss_domains) {
161: my %domconfig = &Apache::lonnet::get_dom('configuration',['serverstatuses'],$dom);
162: if ($Apache::lonnet::env{'request.role'} eq "dc./$dom/") {
163: $allowed = 1;
164: } elsif (ref($domconfig{'serverstatuses'}) eq 'HASH') {
165: if (ref($domconfig{'serverstatuses'}{$page}) eq 'HASH') {
166: if ($domconfig{'serverstatuses'}{$page}{'namedusers'} ne '') {
167: my @okusers = split(/,/,$domconfig{'serverstatuses'}{$page}{'namedusers'});
168: if (grep(/^\Q$Apache::lonnet::env{'user.name'}:$Apache::lonnet::env{'user.domain'}\E$/,@okusers)) {
169: $allowed = 1;
170: }
171: }
172: }
173: }
174: last if $allowed;
175: }
176: }
177: return $allowed;
178: }
179:
180: #############################################
181: #############################################
182:
183: =pod
184:
185: =unauthorized_msg()
186:
187: Inputs: $page, the identifier of the page to be viewed,
188: can be one of the keys in the hash from &serverstatus_titles()
189:
190: Returns: A string explaining why access was denied for the particular page.
191:
192: =cut
193:
194: #############################################
195: #############################################
196: sub unauthorized_msg {
197: my ($page) = @_;
198: my $titles = &serverstatus_titles();
199: if ($page eq 'clusterstatus') {
200: return &mt('Your current role does not permit you to view the requested server status page: [_1]',$titles->{$page});
201: }
202: my @poss_domains = &Apache::lonnet::current_machine_domains();
203: if (@poss_domains == 1) {
204: my $domdesc = &Apache::lonnet::domain($poss_domains[0]);
205: return &mt('The configuration for domain: [_1] does not permit you to view the requested server status page: [_2].',"$domdesc ($poss_domains[0])",$titles->{$page});
206: } elsif (@poss_domains > 1) {
207: my $output = &mt('Configurations for the domains housed on this server: ').'<ul>';
208: foreach my $dom (@poss_domains) {
209: my $domdesc = &Apache::lonnet::domain($dom);
210: $output .= '<li>'.&Apache::lonnet::domain($dom).'('.$dom.')</li>';
211: }
212: $output .= '</ul>'.&mt('do not permit you to view the requested server status page: [_1]',$titles->{$page});
213: return $output;
214: } else {
215: return &mt('No domain information exists for this server');
216: }
217: }
218:
219: #############################################
220: #############################################
221:
222: =pod
223:
224: =item serverstatus_titles()
225:
226: Inputs: none
227:
228: Returns: a reference to a hash of pages, where in the hash
229: keys are names of pages which employ loncgi.pm
230: or lonstatusacc.pm for access control,
231: and corresponding values are descriptions of each page
232:
233: =cut
234:
235: #############################################
236: #############################################
237: sub serverstatus_titles {
238: my %titles = &Apache::lonlocal::texthash (
239: 'userstatus' => 'User Status Summary',
240: 'lonstatus' => 'Display Detailed Report',
241: 'loncron' => 'Generate Detailed Report',
242: 'server-status' => 'Apache Status Page',
243: 'codeversions' => 'LON-CAPA Module Versions',
244: 'clusterstatus' => 'Domain status',
245: 'metadata_keywords' => 'Display Metadata Keywords',
246: 'metadata_harvest' => 'Harvest Metadata Searches',
247: 'takeoffline' => 'Offline - replace Log-in page',
248: 'takeonline' => 'Online - restore Log-in page',
249: 'showenv' => "Show user environment",
250: );
251: return \%titles;
252: }
253:
254:
255: 1;
256:
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