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77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
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## 关于 SOCKS5 over TLS 方案的安全提示
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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**。
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### 探测方式
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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。
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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。
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来自 [@studentmain](https://github.com/studentmain) 的两个典型样例对话：
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```
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-> 05 01 01
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<- 05 ff
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```
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```
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-> 05 02 00 02
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<- 05 00 / 05 02
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```
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### 参考资料
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[RFC1928](https://tools.ietf.org/html/rfc1928) 节录如下：
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```
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The client connects to the server, and sends a version
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identifier/method selection message:
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+----+----------+----------+
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|VER | NMETHODS | METHODS |
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+----+----------+----------+
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| 1 | 1 | 1 to 255 |
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+----+----------+----------+
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The VER field is set to X'05' for this version of the protocol. The
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NMETHODS field contains the number of method identifier octets that
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appear in the METHODS field.
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The server selects from one of the methods given in METHODS, and
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sends a METHOD selection message:
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+----+--------+
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|VER | METHOD |
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+----+--------+
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| 1 | 1 |
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+----+--------+
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If the selected METHOD is X'FF', none of the methods listed by the
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client are acceptable, and the client MUST close the connection.
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The values currently defined for METHOD are:
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o X'00' NO AUTHENTICATION REQUIRED
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o X'01' GSSAPI
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o X'02' USERNAME/PASSWORD
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o X'03' to X'7F' IANA ASSIGNED
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o X'80' to X'FE' RESERVED FOR PRIVATE METHODS
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o X'FF' NO ACCEPTABLE METHODS
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```
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[RFC1929](https://tools.ietf.org/html/rfc1929) 节录如下：
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```
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The server verifies the supplied UNAME and PASSWD, and sends the
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following response:
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+----+--------+
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|VER | STATUS |
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+----+--------+
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| 1 | 1 |
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+----+--------+
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A STATUS field of X'00' indicates success. If the server returns a
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`failure' (STATUS value other than X'00') status, it MUST close the
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connection.
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```
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