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<?php
# Copyright (c) 2010-2016 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.
require_once 'ykval-common.php';
class LogVerify
{
public $format = NULL;
private $fields = array(
'time_start' => NULL,
'time_end' => NULL,
'time_taken' => NULL,
'ip' => NULL,
'client' => NULL,
'public_id' => NULL,
'otp' => NULL,
'status' => NULL,
'nonce' => NULL,
'signed' => NULL,
'counter' => NULL,
'low' => NULL,
'high' => NULL,
'use' => NULL,
'tls' => NULL,
'protocol' => NULL,
'sl' => NULL,
'timeout' => NULL,
);
/**
* Set field value.
*
* @param $name string
* @param $value mixed
* @return bool
*/
public function set($name, $value)
{
// not settable from outside
if ($name === 'time_end' || $name === 'time_taken')
return false;
if (array_key_exists($name, $this->fields) === FALSE)
return false;
$this->fields[$name] = $value;
return true;
}
/**
* Write verify request log line to syslog.
*
* @return bool
*/
public function write()
{
if ($this->format === NULL)
return false;
$values = array();
foreach ($this->sanitized() as $key => $val)
{
$values['%'.$key.'%'] = $val;
}
$message = strtr($this->format, $values);
if (!is_string($message))
return false;
return syslog(LOG_INFO, $message);
}
/**
* Sanitize untrusted values from clients before writing them to syslog.
*
* P.S. signed, status, time_start, tls are assumed safe,
* since they are set internally.
*
* @return array sanitized $this->fields
*/
private function sanitized()
{
$a = $this->fields;
if (preg_match('/^[cbdefghijklnrtuv]+$/', $a['public_id']) !== 1
|| strlen($a['public_id']) < 1
|| strlen($a['public_id']) > (OTP_MAX_LEN - TOKEN_LEN))
{
$a['public_id'] = '-';
}
if (preg_match('/^[cbdefghijklnrtuv]+$/', $a['otp']) !== 1
|| strlen($a['otp']) < TOKEN_LEN
|| strlen($a['otp']) > OTP_MAX_LEN)
{
$a['otp'] = '-';
}
if (preg_match('/^[0-9]+$/', $a['client']) !== 1)
$a['client'] = '-';
if (filter_var($a['ip'], FILTER_VALIDATE_IP) === FALSE)
$a['ip'] = '-';
if (is_int($a['counter']) === FALSE)
$a['counter'] = '-';
if (is_int($a['low']) === FALSE)
$a['low'] = '-';
if (is_int($a['high']) === FALSE)
$a['high'] = '-';
if (is_int($a['use']) === FALSE)
$a['use'] = '-';
if (preg_match('/^[a-zA-Z0-9]{16,40}$/', $a['nonce']) !== 1)
$a['nonce'] = '-';
if (is_float($a['protocol']) === TRUE)
$a['protocol'] = sprintf('%.1f', $a['protocol']);
else
$a['protocol'] = '-';
if ( $a['sl'] !== 'fast'
&& $a['sl'] !== 'secure'
&& (preg_match('/^[0-9]{1,3}$/', $a['sl']) !== 1 || (((int) $a['sl']) > 100)))
{
$a['sl'] = '-';
}
if (preg_match('/^[0-9]+$/', $a['timeout']) !== 1)
$a['timeout'] = '-';
$start = explode(' ', $a['time_start']);
$start_msec = $start[0];
$start_sec = $start[1];
$start = bcadd($start_sec, $start_msec, 8);
unset($start_sec, $start_msec);
$end = explode(' ', microtime());
$end_msec = $end[0];
$end_sec = $end[1];
$end = bcadd($end_sec, $end_msec, 8);
unset($end_sec, $end_msec);
$taken = bcsub($end, $start, 8);
$a['time_start'] = $start;
$a['time_end'] = $end;
$a['time_taken'] = $taken;
return $a;
}
}
|
