> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/web-vulnerabilities/api-attack/authentication-api-pentesting-web.md).
# 认证 API
## API 身份验证
登录：
```json
curl -s -X POST http://secret.htb:3000/api/user/login -H "Content-Type: application/json" -d '{
"email": "jordan@htb.com",
"password": "jordan"
}' ; echo
```
这会返回一个身份验证令牌（`auth-token`). `eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2NzIxZjE5ZmQ4YWMzZTA0NjMxZjc4NmQiLCJuYW1lIjoiam9yZGFuIiwiZW1haWwiOiJqb3JkYW5AaHRiLmNvbSIsImlhdCI6MTczMDI3ODEyM30.z6quBZ6bTMSrkl7NxIfLEL0gUw6Wjvm3HWdnlhZBUoQ`
### 默认会验证 JSON 正文
`email: "root@dasith.works"` `password: "Kekc8swFgD6zU"`
### 验证漏洞 [JSON Web 令牌](/zh/web-vulnerabilities/json-web-token-jwt-attack.md)
使用网站解码 JWT，以读取并修改其内容。
> **注意**：JWT 令牌应当是无效的。通过将字段 "name" 和 "email" 修改为管理员值：
{% embed url="" %}
`"name": "theadmin",` `"email": "root@dasith.works",` `eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2NzIxZjE5ZmQ4YWMzZTA0NjMxZjc4NmQiLCJuYW1lIjoidGhlYWRtaW4iLCJlbWFpbCI6InJvb3RAZGFzaXRoLndvcmtzIiwiaWF0IjoxNzMwMjc4MTIzfQ.yn6hXmpBxrfb5TMDY4_6zirckzlhnQP_L_YWb4wL2Ug`
### 尝试访问私有 API：
使用修改后的 JWT 尝试访问私有 API：
{% code overflow="wrap" %}
```bash
curl -s -X GET "http://secret.htb:3000/api/priv" -H "auth-token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2NzIxZjE5ZmQ4YWMzZTA0NjMxZjc4NmQiLCJuYW1lIjoidGhlYWRtaW4iLCJlbWFpbCI6InJvb3RAZGFzaXRoLndvcmtzIiwiaWF0IjoxNzMwMjc4MTIzfQ.yn6hXmpBxrfb5TMDY4_6zirckzlhnQP_L_YWb4wL2Ug" | jq
```
{% endcode %}
我们收到一条消息“invalid token”。
使用我们自己的 JWT，我们以普通用户身份获得访问权限：
{% code overflow="wrap" %}
```bash
curl -s -X GET "http://secret.htb:3000/api/priv" -H "auth-token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2NzIxZjE5ZmQ4YWMzZTA0NjMxZjc4NmQiLCJuYW1lIjoiam9yZGFuIiwiZW1haWwiOiJqb3JkYW5AaHRiLmNvbSIsImlhdCI6MTczMDI3ODEyM30.z6quBZ6bTMSrkl7NxIfLEL0gUw6Wjvm3HWdnlhZBUoQ" | jq
```
{% endcode %}
我们收到一条消息“You are normal user”。
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