mirror of
https://github.com/XTLS/Xray-examples.git
synced 2024-11-25 10:01:29 +00:00
77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
|
## 关于 SOCKS5 over TLS 方案的安全提示
|
||
|
|
|
||
|
|
该配置组合应仅供技术研究/参考使用，因为 **SOCKS5 over TLS 几乎不提供隐密性保证，可被简单地主动探测**。
|
||
|
|
|
||
|
|
### 探测方式
|
||
|
|
对任意未知 TLS 业务，若怀疑其为 SOCKS5/TLS 业务，审查者可向该端口建立一个 TLS 连接并在其上传送 SOCKS5 载荷。
|
||
|
|
|
||
|
|
若该服务对 SOCKS5 请求做出响应，无论是否设置 SOCKS5 的鉴权机制，审查者均可通过回包内容一次准确判断该业务是否为 SOCKS5 / TLS。
|
||
|
|
|
||
|
|
来自 [@studentmain](https://github.com/studentmain) 的两个典型样例对话：
|
||
|
|
|
||
|
|
```
|
||
|
|
-> 05 01 01
|
||
|
|
<- 05 ff
|
||
|
|
```
|
||
|
|
|
||
|
|
```
|
||
|
|
-> 05 02 00 02
|
||
|
|
<- 05 00 / 05 02
|
||
|
|
```
|
||
|
|
|
||
|
|
### 参考资料
|
||
|
|
[RFC1928](https://tools.ietf.org/html/rfc1928) 节录如下：
|
||
|
|
```
|
||
|
|
The client connects to the server, and sends a version
|
||
|
|
identifier/method selection message:
|
||
|
|
|
||
|
|
+----+----------+----------+
|
||
|
|
|VER | NMETHODS | METHODS |
|
||
|
|
+----+----------+----------+
|
||
|
|
| 1 | 1 | 1 to 255 |
|
||
|
|
+----+----------+----------+
|
||
|
|
|
||
|
|
The VER field is set to X'05' for this version of the protocol. The
|
||
|
|
NMETHODS field contains the number of method identifier octets that
|
||
|
|
appear in the METHODS field.
|
||
|
|
|
||
|
|
The server selects from one of the methods given in METHODS, and
|
||
|
|
sends a METHOD selection message:
|
||
|
|
|
||
|
|
+----+--------+
|
||
|
|
|VER | METHOD |
|
||
|
|
+----+--------+
|
||
|
|
| 1 | 1 |
|
||
|
|
+----+--------+
|
||
|
|
|
||
|
|
If the selected METHOD is X'FF', none of the methods listed by the
|
||
|
|
client are acceptable, and the client MUST close the connection.
|
||
|
|
|
||
|
|
The values currently defined for METHOD are:
|
||
|
|
|
||
|
|
o X'00' NO AUTHENTICATION REQUIRED
|
||
|
|
o X'01' GSSAPI
|
||
|
|
o X'02' USERNAME/PASSWORD
|
||
|
|
o X'03' to X'7F' IANA ASSIGNED
|
||
|
|
o X'80' to X'FE' RESERVED FOR PRIVATE METHODS
|
||
|
|
o X'FF' NO ACCEPTABLE METHODS
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
[RFC1929](https://tools.ietf.org/html/rfc1929) 节录如下：
|
||
|
|
|
||
|
|
```
|
||
|
|
The server verifies the supplied UNAME and PASSWD, and sends the
|
||
|
|
following response:
|
||
|
|
|
||
|
|
+----+--------+
|
||
|
|
|VER | STATUS |
|
||
|
|
+----+--------+
|
||
|
|
| 1 | 1 |
|
||
|
|
+----+--------+
|
||
|
|
|
||
|
|
A STATUS field of X'00' indicates success. If the server returns a
|
||
|
|
`failure' (STATUS value other than X'00') status, it MUST close the
|
||
|
|
connection.
|
||
|
|
```
|