mirror of
https://github.com/Yubico/yubikey-ksm.git
synced 2024-12-11 09:24:14 +01:00
107 lines
3.4 KiB
PHP
107 lines
3.4 KiB
PHP
<?php
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# Written by Simon Josefsson <simon@josefsson.org>.
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# Copyright (c) 2009-2013 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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require_once 'ykksm-config.php';
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require_once '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 = $matches[2];
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try {
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$dbh = new PDO($db_dsn, $db_username, $db_password, $db_options);
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} catch (PDOException $e) {
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syslog(LOG_ERR, "Database error: " . $e->getMessage());
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die("ERR Database error\n");
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}
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$sql = "SELECT aeskey, internalname FROM yubikeys " .
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"WHERE publicname = '$id' AND active";
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$result = $dbh->query($sql);
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if (!$result) {
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syslog(LOG_ERR, "Database query error. Query: " . $sql . " Error: " .
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print_r ($dbh->errorInfo (), true));
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die("ERR Database error\n");
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}
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$row = $result->fetch(PDO::FETCH_ASSOC);
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$aeskey = $row['aeskey'];
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$internalname = $row['internalname'];
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if (!$aeskey) {
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syslog(LOG_INFO, "Unknown yubikey: " . $otp);
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die("ERR Unknown yubikey\n");
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}
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$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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# Close database connection.
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$dbh = null;
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?>
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