1: #
2: # $Id: lonssl.pm,v 1.5 2004/05/27 10:26:19 foxr Exp $
3: #
4: # Copyright Michigan State University Board of Trustees
5: #
6: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
7: #
8: # LON-CAPA is free software; you can redistribute it and/or modify
9: # it under the terms of the GNU General Public License as published by
10: # the Free Software Foundation; either version 2 of the License, or
11: # (at your option) any later version.
12: #
13: # LON-CAPA is distributed in the hope that it will be useful,
14: # but WITHOUT ANY WARRANTY; without even the implied warranty of
15: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: # GNU General Public License for more details.
17: #
18: # You should have received a copy of the GNU General Public License
19: # along with LON-CAPA; if not, write to the Free Software
20: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21: #
22: # /home/httpd/html/adm/gpl.txt
23: #
24: # http://www.lon-capa.org/
25: #
26:
27: # lonssl.pm
28: # This file contains common functions used by lond and lonc when
29: # negotiating the exchange of the session encryption key via an
30: # SSL tunnel.
31: # See the POD sections and function documentation for more information.
32: #
33:
34: use strict;
35:
36: # CPAN modules:
37:
38: use IO::Socket::INET;
39: use IO::Socket::SSL;
40:
41: # Loncapa modules:
42:
43: use LONCAPA::Configuration;
44:
45: # Global storage:
46:
47: my $perlvar; # this refers to the apache perlsetvar
48: # variable hash.
49:
50: my $pathsep = "/"; # We're on unix after all.
51:
52:
53: # Initialization code:
54:
55: $perlvar = LONCAPA::Configuration::read_conf('loncapa.conf');
56:
57:
58:
59: #--------------------------------------------------------------------------
60: #
61: # Name PromoteClientSocket
62: # Description Given an ordinary IO::Socket::INET Creates an SSL socket
63: # for a client that is connected to the same server.
64: # Parameters Name Type Description
65: # Socket IO::Socket::INET Original ordinary socket.
66: # CACert string Full path name to the certificate
67: # authority certificate file.
68: # MyCert string Full path name to the certificate
69: # issued to this host.
70: # KeyFile string Full pathname to the host's private
71: # key file for the certificate.
72: # Returns
73: # - Reference to an SSL socket on success
74: # - undef on failure. Reason for failure can be interrogated from
75: # IO::Socket::SSL
76:
77: sub PromoteClientSocket {
78: my $PlaintextSocket = shift;
79: my $CACert = shift;
80: my $MyCert = shift;
81: my $KeyFile = shift;
82:
83: # To create the ssl socket we need to duplicate the existing
84: # socket. Otherwise closing the ssl socket will close the plaintext socket
85: # too:
86:
87: open (DUPLICATE, "+>$PlaintextSocket");
88:
89: my $client = IO::Socket::SSL->new_from_fd(fileno(DUPLICATE),
90: SSL_user_cert => 1,
91: SSL_key_file => $KeyFile,
92: SSL_cert_file => $MyCert,
93: SSL_ca_fie => $$CACert);
94:
95: return $client; # Undef if the client negotiation fails.
96: }
97:
98: #----------------------------------------------------------------------
99: # Name PromoteServerSocket
100: # Description Given an ordinary IO::Socket::INET Creates an SSL socket
101: # for a server that is connected to the same client.l
102: # Parameters Name Type Description
103: # Socket IO::Socket::INET Original ordinary socket.
104: # CACert string Full path name to the certificate
105: # authority certificate file.
106: # MyCert string Full path name to the certificate
107: # issued to this host.
108: # KeyFile string Full pathname to the host's private
109: # key file for the certificate.
110: # Returns
111: # - Reference to an SSL socket on success
112: # - undef on failure. Reason for failure can be interrogated from
113: # IO::Socket::SSL
114: sub PromoteServerSocket {
115: my $PlaintextSocket = shift;
116: my $CACert = shift;
117: my $MyCert = shift;
118: my $KeyFile = shift;
119:
120:
121: # To create the ssl socket we need to duplicate the existing
122: # socket. Otherwise closing the ssl socket will close the plaintext socket
123: # too:
124:
125: open (DUPLICATE, "+>$PlaintextSocket");
126:
127: my $client = IO::Socket::SSL->new_from_fd(fileno(DUPLICATE),
128: SSL_server => 1, # Server role.
129: SSL_user_cert => 1,
130: SSL_key_file => $KeyFile,
131: SSL_cert_file => $MyCert,
132: SSL_ca_fie => $$CACert);
133: return $client;
134: }
135:
136: #-------------------------------------------------------------------------
137: #
138: # Name: Close
139: # Description: Properly closes an ssl client or ssl server socket in
140: # a way that keeps the parent socket open.
141: # Parameters: Name Type Description
142: # Socket IO::Socket::SSL SSL Socket gotten from either
143: # PromoteClientSocket or
144: # PromoteServerSocket
145: # Returns:
146: # NONE
147: #
148: sub Close {
149: my $Socket = shift;
150:
151: $Socket->close(SSL_no_shutdown =>1); # Otherwise the parent socket
152: # gets torn down.
153: }
154: #---------------------------------------------------------------------------
155: #
156: # Name GetPeerCertificate
157: # Description Inquires about the certificate of the peer of a connection.
158: # Parameters Name Type Description
159: # SSLSocket IO::Socket::SSL SSL tunnel socket open on
160: # the peer.
161: # Returns
162: # A two element list. The first element of the list is the name of
163: # the certificate authority. The second element of the list is the name
164: # of the owner of the certificate.
165: sub GetPeerCertificate {
166: my $SSLSocket = shift;
167:
168: my $CertOwner = $SSLSocket->peer_certificate("owner");
169: my $CertCA = $SSLSocket->peer_certificate("authority");
170:
171: return \($CertCA, $CertOwner);
172: }
173: #----------------------------------------------------------------------------
174: #
175: # Name CertificateFile
176: # Description Locate the certificate files for this host.
177: # Returns
178: # Returns a two element array. The first element contains the name of
179: # the certificate file for this host. The second element contains the name
180: # of the certificate file for the CA that granted the certificate. If
181: # either file cannot be located, returns undef.
182: #
183: sub CertificateFile {
184:
185: # I need some perl variables from the configuration file for this:
186:
187: my $CertificateDir = $perlvar->{lonCertificateDirectory};
188: my $CaFilename = $perlvar->{lonnetCertificateAuthority};
189: my $CertFilename = $perlvar->{lonnetCertificate};
190:
191: # Ensure the existence of these variables:
192:
193: if((!$CertificateDir) || (!$CaFilename) || (!$CertFilename)) {
194: return undef;
195: }
196:
197: # Build the actual filenames and check for their existence and
198: # readability.
199:
200: my $CaFilename = $CertificateDir.$pathsep.$CaFilename;
201: my $CertFilename = $CertificateDir.$pathsep.$CertFilename;
202:
203: if((! -r $CaFilename) || (! -r $CertFilename)) {
204: return undef;
205: }
206:
207: # Everything works fine!!
208:
209: return \($CaFilename, $CertFilename);
210:
211: }
212: #------------------------------------------------------------------------
213: #
214: # Name KeyFile
215: # Description
216: # Returns the name of the private key file of the current host.
217: # Returns
218: # Returns the name of the key file or undef if the file cannot
219: # be found.
220: #
221: sub KeyFile {
222:
223: # I need some perl variables from the configuration file for this:
224:
225: my $CertificateDir = $perlvar->{lonCertificateDirectory};
226: my $KeyFilename = $perlvar->{lonnetPrivateKey};
227:
228: # Ensure the variables exist:
229:
230: if((!$CertificateDir) || (!$KeyFilename)) {
231: return undef;
232: }
233:
234: # Build the actual filename and ensure that it not only exists but
235: # is also readable:
236:
237: my $KeyFilename = $CertificateDir.$pathsep.$KeyFilename;
238: if(! (-r $KeyFilename)) {
239: return undef;
240: }
241:
242: return $KeyFilename;
243: }
244:
245: 1;
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