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login.php
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login.php
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<?php
# Copyright (c) 2005, Ron Bowes
# 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.
# * Neither the name of the organization nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# 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.
#
# login.php
# This is the file used for logging in. There are two parameters, the username
# and the password. These are sanitized, and it checks if the account is in the
# database
#
header('Pragma: no-cache');
require('shared.php');
if(isset($_GET['action']))
$action = $_GET['action'];
if(isset($action) && $action == "logout")
{
logout();
show_message_redirect_back("Logged out");
}
else
{
$username = mysql_escape_string(htmlentities(trim($_POST['username'])));
$password = $_POST['password'];
$info = check_login($username, $password);
if(!$info)
{
show_error_redirect_back("Login failed");
}
else
{
show_message_redirect_back("Logged in");
}
}
# Functions
# NOTE: USERNAME HAS TO BE SANITIZED BEFORE ENTERING!
function check_login($username, $password, $remember = true)
{
$db = get_db_read();
# Get the salt and check if the user exists at the same time
$result = try_mysql_query("SELECT salt FROM users WHERE username = '$username'", $db);
if(mysql_num_rows($result) != 1)
return null;
$row = mysql_fetch_assoc($result);
$salt = $row['salt'];
mysql_free_result($result);
$hashed_password = hash_password($password, $salt);
$ret = get_user_info($db, $username, $hashed_password);
if($ret == null)
return null;
if($remember == true)
{
setcookie("username", $username, time()+60*60*24*3000);
setcookie("password", $hashed_password, time()+60*60*24*3000);
}
$_SESSION["username"] = $username;
return $ret;
}
function logout()
{
$_SESSION["username"] = null;
$_SESSION["password"] = null;
setcookie("username", null, time());
setcookie("password", null, time());
}
?>