关于Ucenter的密码分析

因为排查一个问题,顺带着熟悉了一下Discuz!与Ucenter注册和登录的机制,特整理分析。

下面以Discuz! X2.5为例分析代码实现。

1.注册


找到source\class\class_member.php文件,有如下代码:

$uid = uc_user_register(addslashes($username), $password, $email, $questionid, $answer, $_G['clientip']);

uc_user_register定义在uc_client\client.php文件,代码如下:

function uc_user_register($username, $password, $email, $questionid = '', $answer = '', $regip = '') {
    return call_user_func(UC_API_FUNC, 'user', 'register', array('username'=>$username, 'password'=>$password, 'email'=>$email, 'questionid'=>$questionid, 'answer'=>$answer, 'regip' => $regip));
}

此函数会回调uc_server下的方法,执行文件为uc_server\control\user.php,执行代码如下:


<pre escaped="true">function onregister() {
    $this->init_input();
    $username = $this->input('username');
    $password =  $this->input('password');
    $email = $this->input('email');
    $questionid = $this->input('questionid');
    $answer = $this->input('answer');
    $regip = $this->input('regip');

    if(($status = $this->_check_username($username)) < 0) {
        return $status;
    }
    if(($status = $this->_check_email($email)) < 0) {
        return $status;
    }

    $uid = $_ENV['user']->add_user($username, $password, $email, 0, $questionid, $answer, $regip);
    return $uid;
}

add_user定义在uc_server\model\user.php文件,代码如下:


<pre escaped="true">function add_user($username, $password, $email, $uid = 0, $questionid = '', $answer = '', $regip = '') {
    $regip = empty($regip) ? $this->base->onlineip : $regip;
    $salt = substr(uniqid(rand()), -6);
    $password = md5(md5($password).$salt);
    $sqladd = $uid ? "uid='".intval($uid)."'," : '';
    $sqladd .= $questionid > 0 ? " secques='".$this->quescrypt($questionid, $answer)."'," : " secques='',";
    $this->db->query("INSERT INTO ".UC_DBTABLEPRE."members SET $sqladd username='$username', password='$password', email='$email', regip='$regip', regdate='".$this->base->time."', salt='$salt'");
    $uid = $this->db->insert_id();
    $this->db->query("INSERT INTO ".UC_DBTABLEPRE."memberfields SET uid='$uid'");
    return $uid;
}

这里会将用户信息写入Ucenter的用户表中。 在这里可以看到用户密码不是用明文存储的,加密的格式为:
md5(md5(用户密码) . 6位随机串)
2.登录


找到source\class\class_member.php文件,有如下代码:

<pre escaped="true">$result = userlogin($_GET['username'], $_GET['password'], $_GET['questionid'], $_GET['answer'], $this->setting['autoidselect'] ? 'auto' : $_GET['loginfield'], $_G['clientip']);

userlogin定义在source\function\function_member.php文件,函数内部有如下代码:


<pre escaped="true">if($isuid == 3) {
    if(!strcmp(dintval($username), $username)) {
        $return['ucresult'] = uc_user_login($username, $password, 1, 1, $questionid, $answer, $ip);
    } elseif(isemail($username)) {
        $return['ucresult'] = uc_user_login($username, $password, 2, 1, $questionid, $answer, $ip);
    }
    if($return['ucresult'][0] <= 0 && $return['ucresult'][0] != -3) {
        $return['ucresult'] = uc_user_login(addslashes($username), $password, 0, 1, $questionid, $answer, $ip);
    }
} else {
    $return['ucresult'] = uc_user_login(addslashes($username), $password, $isuid, 1, $questionid, $answer, $ip);
}

uc_user_login定义在uc_client\client.php文件,代码如下:

function uc_user_login($username, $password, $isuid = 0, $checkques = 0, $questionid = ”, $answer = ”) {
$isuid = intval($isuid);
$return = call_user_func(UC_API_FUNC, ‘user’, ‘login’, array(‘username’=>$username, ‘password’=>$password, ‘isuid’=>$isuid, ‘checkques’=>$checkques, ‘questionid’=>$questionid, ‘answer’=>$answer));
return UC_CONNECT == ‘mysql’ ? $return : uc_unserialize($return);
}
此函数会回调uc_server下的方法,执行文件为uc_server\control\user.php,执行代码如下:

function onlogin() {
    $this->init_input();
    $isuid = $this->input('isuid');
    $username = $this->input('username');
    $password = $this->input('password');
    $checkques = $this->input('checkques');
    $questionid = $this->input('questionid');
    $answer = $this->input('answer');
    if($isuid == 1) {
        $user = $_ENV['user']->get_user_by_uid($username);
    } elseif($isuid == 2) {
        $user = $_ENV['user']->get_user_by_email($username);
    } else {
        $user = $_ENV['user']->get_user_by_username($username);
    }

    $passwordmd5 = preg_match('/^\w{32}$/', $password) ? $password : md5($password);
    if(empty($user)) {
        $status = -1;
    } elseif($user['password'] != md5($passwordmd5.$user['salt'])) {
        $status = -2;
    } elseif($checkques && $user['secques'] != '' && $user['secques'] != $_ENV['user']->quescrypt($questionid, $answer)) {
        $status = -3;
    } else {
        $status = $user['uid'];
    }
    $merge = $status != -1 && !$isuid && $_ENV['user']->check_mergeuser($username) ? 1 : 0;
    return array($status, $user['username'], $password, $user['email'], $merge);
}

这里会验证用户输入的密码是否和Ucenter里存储的密码一致。

验证的格式为:

首先会验证用户密码是否为32位,如果不是则对用户输出的密码进行md5处理。(32位验证是后台设置的加密传输密码,开启后会先进行md5然后才传递给Ucenter)
Ucenter里存储的对应用户的加密后的密码 == md5(格式化后的用户输入的密码 . Ucenter里存储的对应用户的6位随机串)

本文转自//www.doopen.cn/support-63-show-96-page-1.shtml

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