mirror of
https://github.com/Yubico/yubikey-ksm.git
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110 lines
3.5 KiB
PHP
110 lines
3.5 KiB
PHP
<?php
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# Written by Simon Josefsson <simon@josefsson.org>.
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# Copyright (c) 2009 Yubico AB
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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include 'ykksm-config.php';
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include 'ykksm-utils.php';
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openlog("ykksm", LOG_PID, $logfacility)
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or die("ERR Syslog open error\n");
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$otp = $_REQUEST["otp"];
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if (!$otp) {
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syslog(LOG_INFO, "No OTP provided");
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die("ERR No OTP provided\n");
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}
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if (!preg_match("/^([cbdefghijklnrtuv]{0,16})([cbdefghijklnrtuv]{32})$/",
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$otp, $matches)) {
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syslog(LOG_INFO, "Invalid OTP format: $otp");
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die("ERR Invalid OTP format\n");
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}
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$id = $matches[1];
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$modhex_ciphertext = $matches[2];
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$dbconn = mysql_connect($dbhost, $dbuser, $dbpasswd);
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if (!$dbconn) {
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syslog(LOG_ERR, "Database connect error: " . mysql_error());
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die("ERR Database error\n");
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}
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$db_selected = mysql_select_db($dbname);
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if (!$db_selected) {
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syslog(LOG_ERR, "Database select error: " . mysql_error());
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die("ERR Database error\n");
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}
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$sql = "SELECT aesKey, internalName FROM yubikeys " .
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"WHERE publicName = '$id' AND active";
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$result = mysql_query($sql);
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if (!$result) {
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syslog(LOG_ERR, "Database query error: " . mysql_error());
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die("ERR Database error\n");
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}
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if (mysql_num_rows($result) != 1) {
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syslog(LOG_INFO, "Unknown yubikey: " . $otp);
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die("ERR Unknown yubikey\n");
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}
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$row = mysql_fetch_assoc($result);
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$aesKey = $row['aesKey'];
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$internalName = $row['internalName'];
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$ciphertext = modhex2hex($modhex_ciphertext);
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$plaintext = aes128ecb_decrypt($aesKey, $ciphertext);
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$uid = substr($plaintext, 0, 12);
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if (strcmp($uid, $internalName) != 0) {
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syslog(LOG_ERR, "UID error: $otp $plaintext: $uid vs $internalName");
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die("ERR Corrupt OTP\n");;
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}
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if (!crc_is_good($plaintext)) {
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syslog(LOG_ERR, "CRC error: $otp: $plaintext");
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die("ERR Corrupt OTP\n");
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}
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# Mask out interesting fields
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$counter = substr($plaintext, 14, 2) . substr($plaintext, 12, 2);
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$low = substr($plaintext, 18, 2) . substr($plaintext, 16, 2);
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$high = substr($plaintext, 20, 2);
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$use = substr($plaintext, 22, 2);
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$out = "OK counter=$counter low=$low high=$high use=$use";
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syslog(LOG_INFO, "SUCCESS OTP $otp PT $plaintext $out")
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or die("ERR Log error\n");
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print "$out\n";
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mysql_close()
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or syslog(LOG_ERR, "Database close error (otp $otp): " . mysql_error());
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?>
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