Annotation of loncom/lchtmldir, revision 1.3
1.1 foxr 1: #!/usr/bin/perl
2:
3: # The Learning Online Network with CAPA
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: # lchtmldir - LONC-CAPA setuid script to:
28: # o If necessary, add a public_html directory
29: # to the specified user home directory.
30: # o Set the permissions according to the authentication type.
31: #
32: # Motivations:
33: # Originally, account creation would create a public_html
34: # directory for unix authorized people only. It is possible to have
35: # Kerberos, internal and locally authorized 'users' which may be authors
36: # and hence need a properly owned an protected public_html directory
37: # to serve as their construction space.
38: #
39: # Author:
40: # Ron Fox
41: # NSCL
42: # Michigan State University8
43: # East Lansing, MI 48824-1321
44:
45: # General flow of control:
46: # 1. Validate process state (must be run as www).
47: # 2. Validate parameters: Need two parameters:
48: # o Homedir - Home diretory of user
49: # o Username - Name of the user.
50: # o AuthMode - Authentication mode, can be:
51: # - unix
52: # - internal
53: # - krb4
54: # - localauth
55: # 3. Untaint the usename and home directory
56: #
57: # 4. As root if necessary, create $Homedir/public_html
58: # 5. Set ownership/permissions according to authentication mode (AuthMode)
59: # - unix - ~owner:www/2775
60: # - krb4 - ~owner:www/2775
61: # - internal - www:www/2775
62: # - local - www:www/2775
63: #
64:
65: #
66: # Take a few precautions to be sure that we're not vulnerable to trojan
67: # horses and other fine issues:
68: #
69: use strict;
70:
71: $ENV{'PATH'} = '/bin:/usr/bin:/usr/local/sbin:/home/httpd/perl';
72: delete @ENV{qw{IFS CDPATH ENV BASH_ENV}};
73:
74: my $DEBUG = 0; # .nonzero -> Debug printing enabled.
75:
76:
77: # If the UID of the running process is not www exit with error.
78:
79: if ($DEBUG) {
80: print("Checking uid...\n");
81: }
82: my $wwwid = getpwnam('www');
83: &DisableRoot;
84: if($wwwid != $>) {
85: if ($DEBUG) {
86: print("User ID incorrect. This program must be run as user 'www'\n");
87: }
88: exit 1; # Exit with error status.
89: }
90:
91: # There must be three 'command line' parameters. The first
92: # is the home directory of the user.
93: # The second is the name of the user. This is only referenced
94: # in code branches dealing with unix mode authentication.
95: # The last is the authentication mode which must be one of unix, internal
96: # krb4 or localauth.
97: # If there is an error in the argument count or countents, we exit with an
98: # error.
99:
100: if ($DEBUG) {
101: print("Checking parameters: \n");
102: }
103: if(@ARGV != 3) {
104: if($DEBUG) {
105: print("Error: lchtmldir need 3 parameters \n");
106: }
107: exit 2;
108: }
109: my ($dir,$username,$authentication) = @ARGV;
110:
111: if($DEBUG) {
112: print ("Directory = $dir \n");
113: print ("User = $username \n");
114: print ("Authmode = $authentication \n");
115:
116: }
117:
1.2 foxr 118: if( $authentication ne "unix:" &&
119: $authentication ne "internal:" &&
120: $authentication ne "krb4:" &&
121: $authentication ne "localauth:") {
1.1 foxr 122: if($DEBUG) {
123: print("Invalid authentication parameter: ".$authentication."\n");
124: print("Should be one of: unix, internal, krb4, localauth\n");
125: }
126: exit 3;
127: }
128:
129: # Untaint the username.
130:
131: my $match = $username =~ /^(\w+)$/;
132: my $patt = $1;
133:
134: if($DEBUG) {
135: print("Username word match flag = ".$match."\n");
136: print("Match value = ".$patt."\n");
137: }
138:
139: my $safeuser = $patt;
140: if($DEBUG) {
141: print("Save username = $safeuser \n");
142: }
143: if(($username ne $safeuser) or ($safeuser!~/^[A-za-z]/)) {
144: if($DEBUG) {
145: print("User name $username had illegal characters\n");
146: }
147: exit 4;
148: }
149:
150: #untaint the base directory require that the dir contain only
151: # alphas, / numbers or underscores, and end in /$safeuser
152:
153: $dir =~ /(^([\w\/]+))/;
154:
155: my $dirtry1 = $1;
156:
157: $dir =~ /$\/$safeuser/;
158: my $dirtry2 = $1;
159:
160: if(($dirtry1 ne $dir) or ($dirtry2 ne $dir)) {
161: if ($DEBUG) {
162: print("Directory $dir is not a valid home for $safeuser\n");
163: }
164: exit 5;
165: }
166:
167:
168: # As root, create the directory.
169:
170: my $fulldir = $dirtry1."/public_html";
171: if($DEBUG) {
172: print("Full directory path is: $fulldir \n");
173: }
174: if(!( -e $dirtry1)) {
175: if($DEBUG) {
176: print("User's home directory $dirtry1 does not exist\n");
177: }
178: exit 6;
179: }
180: &EnableRoot;
181:
1.3 ! foxr 182: &System("/bin/mkdir -p $fulldir") unless (-e $fulldir);
1.1 foxr 183: unless(-e $fulldir."/index.html") {
184: open OUT,">".$fulldir."/index.html";
185: print OUT<<END;
186: <html>
187: <head>
188: <title>$safeuser</title>
189: </head>
190: <body>
191: <h1>$safeuser</h1>
192: <p>
193: Learning Online Network
194: </p>
195: <p>
196: This area provides for:
197: </p>
198: <ul>
199: <li>resource construction</li>
200: <li>resource publication</li>
201: <li>record-keeping</li>
202: </ul>
203: </body>
204: </html>
205: END
206: close OUT;
207: }
208: &System("/bin/chmod 02775 $fulldir");
209: &System("/bin/chmod 0775 $fulldir"."/index.html");
210:
211:
212: # Based on the authentiation mode, set the ownership of the directory.
213:
1.2 foxr 214: if($authentication eq "unix:") { # Unix mode authentication...
1.1 foxr 215:
216:
217: &System("/bin/chown -R $username".":".$username." ".$fulldir);
218: &JoinGroup($username);
219:
220:
221: }
1.2 foxr 222: elsif ($authentication eq "internal:") { # Internal authentication.
1.1 foxr 223:
224: &System("/bin/chown -R www:www $fulldir");
225: }
1.2 foxr 226: elsif ($authentication eq "krb4:") { # Kerberos version 4 authentication
227: &System("/bin/chown -R $username".':'.$username." ".$fulldir);
1.1 foxr 228: &JoinGroup($username);
229: }
1.2 foxr 230: elsif ($authentication eq "localauth:") { # Local authentiation
1.1 foxr 231: &System("/bin/chown -R $username".':'.$username." $fulldir");
232: }
233: else {
234: if($DEBUG) {
235: print("Authentication not legal".$authentication);
236: }
237: &DisableRoot;
238: exit 5;
239:
240: }
241: &DisableRoot;
242:
243: exit 0;
244:
245: #----------------------------------------------------------------------
246: #
247: # Local utility procedures.
248: # These include:
249: # EnableRoot - Start running as root.
250: # DisableRoot- Stop running as root.
251: # JoinGroup - Join www to the specified group.
252:
253: # Turn on as root:
254:
255: sub EnableRoot {
256: if ($wwwid==$>) {
257: ($<,$>)=($>,$<);
258: ($(,$))=($),$();
259: }
260: else {
261: # root capability is already enabled
262: }
263: if($DEBUG) {
264: print("Enable Root - id = $> \n");
265: }
266: return $>;
267: }
268:
269: sub DisableRoot {
270: if ($wwwid==$<) {
271: ($<,$>)=($>,$<);
272: ($(,$))=($),$();
273: }
274: else {
275: # root capability is already disabled
276: }
277: if($DEBUG) {
278: print("Disable root: id = ".$>."\n");
279: }
280: }
281:
282: sub JoinGroup {
283: my $usergroup = shift;
284:
285: my $groups = `/usr/bin/groups www`;
286: chomp $groups; $groups=~s/^\S+\s+\:\s+//;
287: my @grouplist=split(/\s+/,$groups);
288: my @ugrouplist=grep {!/www|$usergroup/} @grouplist;
289: my $gl=join(',',(@ugrouplist,$usergroup));
290: if (&System('/usr/sbin/usermod','-G',$gl,'www')) {
291: if($DEBUG) {
292: print "Error. Could not make www a member of the group ".
293: "\"$usergroup\".\n";
294: }
295: exit 6;
296: }
297:
298: }
299:
300:
301:
302: sub System {
303: my $command = shift;
304: if($DEBUG) {
305: print("system: $command \n");
306: }
307: system($command);
308: }
309:
310:
311:
312:
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