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+                    GNU GENERAL PUBLIC LICENSE

+                       Version 3, 29 June 2007

+

+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>

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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF

+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

+

+  16. Limitation of Liability.

+

+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS

+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY

+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE

+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF

+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD

+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),

+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF

+SUCH DAMAGES.

+

+  17. Interpretation of Sections 15 and 16.

+

+  If the disclaimer of warranty and limitation of liability provided

+above cannot be given local legal effect according to their terms,

+reviewing courts shall apply local law that most closely approximates

+an absolute waiver of all civil liability in connection with the

+Program, unless a warranty or assumption of liability accompanies a

+copy of the Program in return for a fee.

+

+                     END OF TERMS AND CONDITIONS

+

+            How to Apply These Terms to Your New Programs

+

+  If you develop a new program, and you want it to be of the greatest

+possible use to the public, the best way to achieve this is to make it

+free software which everyone can redistribute and change under these terms.

+

+  To do so, attach the following notices to the program.  It is safest

+to attach them to the start of each source file to most effectively

+state the exclusion of warranty; and each file should have at least

+the "copyright" line and a pointer to where the full notice is found.

+

+    <one line to give the program's name and a brief idea of what it does.>

+    Copyright (C) <year>  <name of author>

+

+    This program is free software: you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation, either version 3 of the License, or

+    (at your option) any later version.

+

+    This program is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+

+Also add information on how to contact you by electronic and paper mail.

+

+  If the program does terminal interaction, make it output a short

+notice like this when it starts in an interactive mode:

+

+    <program>  Copyright (C) <year>  <name of author>

+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

+    This is free software, and you are welcome to redistribute it

+    under certain conditions; type `show c' for details.

+

+The hypothetical commands `show w' and `show c' should show the appropriate

+parts of the General Public License.  Of course, your program's commands

+might be different; for a GUI interface, you would use an "about box".

+

+  You should also get your employer (if you work as a programmer) or school,

+if any, to sign a "copyright disclaimer" for the program, if necessary.

+For more information on this, and how to apply and follow the GNU GPL, see

+<http://www.gnu.org/licenses/>.

+

+  The GNU General Public License does not permit incorporating your program

+into proprietary programs.  If your program is a subroutine library, you

+may consider it more useful to permit linking proprietary applications with

+the library.  If this is what you want to do, use the GNU Lesser General

+Public License instead of this License.  But first, please read

+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

diff --git a/README b/README
new file mode 100644
index 0000000..860f23e
--- /dev/null
+++ b/README
@@ -0,0 +1,39 @@
+YubiServe has been written by Alessio Periloso <nospam *at* periloso.it>
+Version 1.0: 21/05/2010
+
+This simple service allows to authenticate yubikeys using only a small
+sqlite database.
+The code has been released under GNU license (license into LICENSE file)
+
+To authenticate, call the script yubiserve.php with the parameter otp.
+Ex.: yubiserve.php?otp=vviblrbuicuvevcnnedbuuhjfhrebjlchhidkfrdkike
+
+To add a new key, run ./keyconf.py -a <publicname> <internalname> <aeskey>
+To delete a key, run ./keyconf.py -k <publicname>
+To disable a key (disabling a key won't delete it from the db), run
+  ./keyconf.py -d <publicname>
+To enable a key, run ./keyconf.py -e <publicname>
+
+
+The YubiServe service needs the php-sqlite, php-mcrypt and python-sqlite support.
+On debian/ubuntu, you can run:
+sudo apt-get install php5-mcrypt php5-sqlite python-sqlite
+
+About Apache configuration, it is **REALLY IMPORTANT** users are not
+allowed to download the yubikeys.sqlite database. For this purpose,
+I wrote the .htaccess file into yubiserve directory. Sometimes 
+however, into main Apache configuration the AllowOverride parameter
+is set to "None", and the .htaccess won't be loaded at all.
+If this is your case, be sure to add to your apache configuration the
+following lines (change <path to yubiserve>!!!):
+
+        <Directory <path to yubiserve>/>
+#ex.	<Directory /var/www/yubiserve/>
+                Order deny,allow
+                Deny from all
+
+                <Files yubiserve.php>
+                        Order deny,allow
+                        Allow from all
+                </Files>
+        </Directory>
diff --git a/keyconf.py b/keyconf.py
new file mode 100755
index 0000000..78d3af1
--- /dev/null
+++ b/keyconf.py
@@ -0,0 +1,58 @@
+#!/usr/bin/python
+import sqlite, time
+from sys import argv
+
+con = sqlite.connect('yubikeys.sqlite')
+cur = con.cursor()
+
+if (len(argv)<3):
+	print "YubiServe Key Management Tool 1.0\n"
+	print " -a <publicname> <internalname> <aeskey>\tAdd a new key"
+	print " -k <publicname>\t\t\t\tDelete a key from database"
+	print " -d <publicname>\t\t\t\tDisable a key from database (it will be kept)"
+	print " -e <publicname>\t\t\t\tEnable a key within the database\n"
+else:
+	if ((argv[1] == '-d') and (len(argv)>2)):
+		cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "'")
+		if (cur.rowcount == 0):
+			print "Key not found."
+		else:
+			cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "' AND active = 'true'")
+			if (cur.rowcount == 1):
+				cur.execute("UPDATE yubikeys SET active = 'false' WHERE publicname = '" + argv[2] + "'")
+				print "Key " + argv[2] + " disabled."
+				con.commit()
+			else:
+				print "Key is already disabled."
+
+	elif ((argv[1] == '-e') and (len(argv)>2)):
+		cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "'")
+		if (cur.rowcount == 0):
+			print "Key not found."
+		else:
+			cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "' AND active = 'false'")
+			if (cur.rowcount == 1):
+				cur.execute("UPDATE yubikeys SET active = 'true' WHERE publicname = '" + argv[2] + "'")
+				print "Key " + argv[2] + " enabled."
+				con.commit()
+			else:
+				print "Key is already enabled."
+	elif ((argv[1] == '-k') and (len(argv)>2)):
+		cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "'")
+		if (cur.rowcount == 0):
+			print "Key not found."
+		else:
+			cur.execute("DELETE FROM yubikeys WHERE publicname = '" + argv[2] + "'")
+			print "Key " + argv[2] + " deleted."
+			con.commit()
+	elif ((argv[1] == '-a') and (len(argv)>3)):
+		if ((len(argv[2])<=16) and (len(argv[3]) <= 12) and (len(argv[4])<=32)):
+			cur.execute("SELECT * FROM yubikeys WHERE publicname = '" + argv[2] + "'")
+			if (cur.rowcount == 0):
+				cur.execute("INSERT INTO yubikeys VALUES ('" + argv[2] + "', '" + time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()) + "', '" + argv[3] + "', '" + argv[4] + "', 'true', 1, 1)")
+				con.commit()
+				print "Key " + argv[2] + " added to database."
+			else:
+				print "Key is already into database. Delete it before adding the same key!"
+	else:
+		print "Not enough parameters. Try looking at " + argv[0] + " --help"
diff --git a/src/dump.sql b/src/dump.sql
new file mode 100644
index 0000000..859b68b
--- /dev/null
+++ b/src/dump.sql
@@ -0,0 +1,9 @@
+create table yubikeys(
+	publicname varchar(16) unique not null,
+	created varchar(24) not null,
+	internalname varchar(12) not null,
+	aeskey varchar(32) not null,
+	active boolean default true,
+	counter integer not null default 1,
+	time integer not null  default 1
+);
diff --git a/yubikeys.sqlite b/yubikeys.sqlite
new file mode 100644
index 0000000..c42005b
--- /dev/null
+++ b/yubikeys.sqlite
diff --git a/yubiserve-config.php b/yubiserve-config.php
new file mode 100644
index 0000000..b5654c2
--- /dev/null
+++ b/yubiserve-config.php
@@ -0,0 +1,28 @@
+<?php
+/*
+
+Written by Alessio Periloso <nospam *at* periloso.it>
+Version 1.0: 21/05/2010
+
+Licensed under GPL License (see LICENSE file)
+
+*/
+
+$filename = 'yubikeys.sqlite';
+
+
+
+if (!extension_loaded('mcrypt')) {
+    die("mcrypt not loaded!");
+}
+
+$logfacility = LOG_LOCAL0;
+openlog("yubiserve", LOG_PID, $logfacility)
+  or die("ERR Syslog open error\n");
+
+if (!($db = new SQLiteDatabase($filename))) {
+  syslog(LOG_INFO, "Cannot access database");
+  die("Cannot access database");
+}
+
+?>
diff --git a/yubiserve-utils.php b/yubiserve-utils.php
new file mode 100644
index 0000000..56669a6
--- /dev/null
+++ b/yubiserve-utils.php
@@ -0,0 +1,80 @@
+<?php
+/*
+YubiServe has been written by Alessio Periloso <nospam *at* periloso.it>
+
+
+This file is based on the work made by Simon Josefsson <simon@josefsson.org>.
+Follows his license:
+
+# Copyright (c) 2010 Yubico AB
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#   * Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#
+#   * Redistributions in binary form must reproduce the above
+#     copyright notice, this list of conditions and the following
+#     disclaimer in the documentation and/or other materials provided
+#     with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+function hex2bin($h)
+{
+  return pack("H*" , $h);
+}
+
+function modhex2hex($m)
+{
+  return strtr($m, "cbdefghijklnrtuv", "0123456789abcdef");
+}
+
+function aes128ecb_decrypt($key,$in)
+{
+  return bin2hex(mcrypt_ecb(MCRYPT_RIJNDAEL_128,
+			    hex2bin($key),
+			    hex2bin($in),
+			    MCRYPT_DECRYPT,
+			    hex2bin('00000000000000000000000000000000')));
+}
+	
+function calculate_crc($token)
+{
+  $crc = 0xffff;
+
+  for ($i = 0; $i < 16; $i++ ) {
+    $b = hexdec($token[$i*2].$token[($i*2)+1]);
+    $crc = $crc ^ ($b & 0xff);
+    for ($j = 0; $j < 8; $j++) {
+      $n = $crc & 1;
+      $crc = $crc >> 1;
+      if ($n != 0) {
+        $crc = $crc ^ 0x8408;
+      }
+    }
+  }
+  return $crc;
+}
+
+function crc_is_good($token) {
+  $crc = calculate_crc($token);
+  return $crc == 0xf0b8;
+}
+
+?>
diff --git a/yubiserve.php b/yubiserve.php
new file mode 100644
index 0000000..946a8fa
--- /dev/null
+++ b/yubiserve.php
@@ -0,0 +1,88 @@
+<?
+/*
+
+Written by Alessio Periloso <nospam *at* periloso.it>
+Version 1.0: 21/05/2010
+
+Licensed under GPL License (see LICENSE file)
+
+*/
+
+require_once 'yubiserve-config.php';
+require_once 'yubiserve-utils.php';
+
+if (!isset($_REQUEST["otp"]))
+  die ("ERR Missing OTP\n");
+$otp = trim($_REQUEST["otp"]);
+
+if ((strlen($otp)<32) || (strlen($otp)>48)) {
+  syslog(LOG_INFO, "Malformed OTP: $otp");
+  die ("ERR Malformed OTP\n");
+}
+
+if (!preg_match("/^([cbdefghijklnrtuv]{0,16})([cbdefghijklnrtuv]{32})$/", $otp, $matches)) {
+  syslog(LOG_INFO, "Invalid OTP format: $otp");
+  die("ERR Invalid OTP format\n");
+ }
+
+$id = $matches[1];
+$modhex_ciphertext = $matches[2];
+
+$results = @$db->query("SELECT aeskey, internalname FROM yubikeys WHERE publicname = '$id' AND active = 'true'");
+if ($results === false) {
+  syslog(LOG_INFO, "Unknown yubikey (internalname: $id)");
+  die("ERR Unknown yubikey\n");
+}
+
+$row = $results->fetchAll(SQLITE_ASSOC);
+if (count($row)>1) {
+  syslog(LOG_INFO, "Multiple keys returned! OTP: $otp");
+  die("ERR Malformed OTP");
+} elseif (count($row)<1) {
+  syslog(LOG_INFO, "Unknown yubikey (internalname: $id)");
+  die("ERR Unknown yubikey\n");
+}
+
+$aeskey = $row[0]['aeskey'];
+$internalname = $row[0]['internalname'];
+
+$ciphertext = modhex2hex($modhex_ciphertext);
+$plaintext = aes128ecb_decrypt($aeskey, $ciphertext);
+
+$uid = substr($plaintext, 0, 12);
+if (strcmp($uid, $internalname) != 0) {
+  syslog(LOG_ERR, "UID error: $otp $plaintext: $uid vs $internalname");
+  die("ERR Corrupt OTP\n");
+}
+
+if (!crc_is_good($plaintext)) {
+  syslog(LOG_ERR, "CRC error: $otp: $plaintext");
+  die("ERR Corrupt OTP\n");
+}
+
+$counter = substr($plaintext, 14, 2) . substr($plaintext, 12, 2);
+$low = substr($plaintext, 18, 2) . substr($plaintext, 16, 2);
+$high = substr($plaintext, 20, 2);
+$use = substr($plaintext, 22, 2);
+
+$timestamp = hexdec($high . $low);
+$internalcounter = hexdec($counter . $use);
+
+#print("$counter $use $high $low\n");
+
+$results = @$db->query("SELECT counter, time FROM yubikeys WHERE publicname = '$id' AND active = 'true' AND counter < $internalcounter");
+$row = @$results->fetchAll(SQLITE_ASSOC);
+
+if (count($row)!=1) {
+  syslog(LOG_ERR, "REPLAYED OTP for yubikey $id (same counter)");
+  die("ERR Replayed OTP");
+} elseif ((($row[0] >> 8) == ($internalcounter >> 8)) && ($row[1] <= $timestamp)) {
+  syslog(LOG_ERR, "REPLAYED OTP for yubikey $id (same timestamp)");
+  die("ERR Replayed OTP");
+}
+
+print "OK Authentication success";
+$results = $db->query("UPDATE yubikeys SET counter = $internalcounter, time = $timestamp WHERE publicname = '$id'");
+
+unset($db);
+?>