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Home Backend Development PHP Tutorial 新手请教合法用户验证问题

新手请教合法用户验证问题

Jun 23, 2016 pm 02:00 PM

大家好!我最近开始学php   登陆界面是这个意思 如果账号和密码与数据库一样 那么给一个session=用户名 

然后在每个界面检测是否合法用户  用include check.php

代码大意就是 如果session为空 那么提示非法 但是发现这样安全性很差 请问还有什么好的思路和代码吗 多谢

新手没多少分 不好意思


回复讨论(解决方案)

session为全局变量,你可以在任意页面检查是否存在session有没有值

session为全局变量,你可以在任意页面检查是否存在session有没有值
我原先的checkA..PHP中是这样写的
session_start();
if($_SESSION[admin_name]==""){
echo "<script>alert('对不起,请通过正确的途径登录博考图书馆管理系统!');window.location.href='login.php';</script>";
}
?>

但是感觉不安全啊 如果外部非法提交一个表单 在用seession==“任意内容” 就能被执行了 请问如何改

$_SESSION[''admin_name]=="" 和session=="" 不一样吧

请告知你的 php 版本

if($_SESSION[admin_name]==""){
应写作
if(! isset($_SESSION['admin_name'])){

5.4.3的版本

打错5.3.4

如果外部非法提交一个表单 在用seession==“任意内容” 就能被执行了
是你想象的还是真实的?

如果外部非法提交一个表单 在用seession==“任意内容” 就能被执行了
是你想象的还是真实的?

我的checkA中代码如下
//权限验证
//2014-3-20
//by liu
session_start();
if ($_SESSION['username']==""){
echo "<script>alert('操作非法!');location='http://127.0.0.1/admin/index.php';</script>";
}
?>

login代码如下
  //验证登陆信息
  //2014-3-24
  //by liu  1s
session_start();
include_once 'connss.php';
//if($_POST['submit']){
$username=$_POST['username'];
$userpasswd=$_POST['userpass'];
$answers=$_POST['answers'];
$userpasswd=md5($userpasswd);
$sql="select * from user where username='$username'";
$query=mysql_query($sql);
$row=mysql_fetch_array($query);
if ($row['answers']==$answers){
  if($row['username']==$username){
   if($row['userpasswd']==$userpasswd){
   $_SESSION['username']=$username;
echo "<script>location='main.php';</script>";
}
else {
echo "<script>alert('用户名,密码,预留问题错误!');location='index.php';</script>";
}}
else {
echo "<script>alert('用户名,密码,预留问题错误!');location='index.php';</script>";
}}
else {
echo "<script>alert('用户名,密码,预留问题错误!');location='index.php';</script>";
}
?>


我在每个页面前include checkA.php

然后我新建一个php  模仿外部提交 内容为一个表单  用于添加新闻  然后开头 用 session_start();
$_SESSION['username']=="123";
发现可以提交成功!  求解 

session_start();
$_SESSION['username']="123";
是php程序,不是表单能提交的!
当然,如果有人跑到你的服务器上修改你的程序,那就另当别论了

session_start();
$_SESSION['username']="123";
是php程序,不是表单能提交的!
当然,如果有人跑到你的服务器上修改你的程序,那就另当别论了

就是想请教下 我这样写的checkA.php是不是安全的  如果不是如何修改呢 谢谢

应该是安全的

应该是安全的

哪还有别的思路的吗 

学习了!!!

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