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socks5/tls: added security concerns
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Socks5-TLS/README.md
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Socks5-TLS/README.md
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## SOCKS5 / TLS
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### 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 / TLS 的组合**极易受到主动探测**。
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根据 [RFC1929](https://tools.ietf.org/html/rfc1929) 所叙,服务器对 SOCKS5 鉴权的返回格式如下:
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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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如此,向可疑服务器建立 TLS 链接之后,随意发送一个鉴权请求,即可通过回包的格式断定该服务是否是 SOCKS5 / TLS。
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