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version 1.2, 2004/05/28 09:39:11
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# |
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# $Id$ |
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# |
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# Copyright Michigan State University Board of Trustees |
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# |
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# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
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# |
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# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
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# |
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package lonlocal; |
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# |
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# Module that provides support for local connections between secure |
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# lonc and secure lond. |
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# |
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# A local connection exchanges one-time session keys through a |
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# file that is written in the certificate directory by lonc and |
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# read/deleted by lond. The file is created with permissions |
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# rw------- (0600) to prevent it from being snooped unless the system |
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# itself has been broken. In addition the file will not be around |
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# for very long so it will be hard to find. |
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# |
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use strict; |
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# CPAN/standard modules |
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use English; |
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use Crypt::IDEA; |
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# LONCAPA modules |
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use LONCAPA::Configuration; |
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# Global variables: |
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my $perlvar; # Refers to the apache perlsetvar hash. |
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# Initialization |
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$perlvar = LONCAPA::Configuration::read_conf('loncapa.conf'); |
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#------------------------------------------------------------------------ |
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# |
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# Name BuildKey |
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# Description: Create an encryption key. |
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# Returns: The key. |
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# |
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sub CreateCipherKey { |
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my $keylength; |
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my $binaryKey; |
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my $cipherkey; |
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# we'll use the output of /dev/random to produce our key. |
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# On a system with decent entropy, this ought to be much more |
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# random than all the playing that used to be done to get a key. |
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# |
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$keylength = IDEA::keysize(); |
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open(RANDOM, "</dev/random"); |
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sysread(RANDOM, $binaryKey, $keylength); |
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close RANDOM; |
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# The key must be returned in a stringified form in order to be |
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# transmitted to the peer: |
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my $hexdigits = $keylength*2; # Assume 8 bits/byte. |
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my $template = "H".$hexdigits; |
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$cipherkey = unpack($template, $binaryKey); |
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return $cipherkey; |
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} |
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#------------------------------------------------------------------------ |
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# |
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# Name CreateKeyFile |
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# Description Creates a private key file and writes an IDEA key into it. |
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# |
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# Returns |
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# A two element list containing: |
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# - The private key that was created |
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# - The full path to the file that contains it. |
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# |
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sub CreateKeyFile { |
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# To create the file we need some perlvars to tell us where the |
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# certificate directory. We'll make a file named localkey.$pid |
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# there, and set the mode before writing into it. |
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# |
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} |
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