Skip to content

Instantly share code, notes, and snippets.

@clowwindy
Last active Aug 14, 2022
Embed
What would you like to do?
为什么不应该用 SSL 翻墙

SSL 设计目标:

  1. 防内容篡改
  2. 防冒充服务器身份
  3. 加密通信内容

而翻墙的目标:

  1. 不被检测出客户端在访问什么网站
  2. 不被检测出服务器在提供翻墙服务

SSL 和这个目标还是有一些出入。其中最大的问题是,2. 防冒充服务器身份 这个功能多余了。他会导致墙嗅探出证书信息,继而墙会知道服务器身份。如果墙知道一个服务器身份是用来翻墙的,它要做的仅仅是封掉使用这个证书的所有 IP。

墙看见的 SSL 握手响应头部如下:

QMQڑ????β????!AFf?a?1??[?
? G
0???R???̙G!GfX-??5?k ??Q?
u
q
0??1 *?H?? n?0?|0?d?"?7??^??eĵ??F0
0 UUS10U
VeriSign, Inc.10U
VeriSign Trust Network1;09U
140510235959Z0?10 2Terms of use at https://www.verisign.com/rpa (c)061402U+VeriSign Class 3 Extended Validation SSL CA0
+?7<US10
+?7Delaware10Private Organization10U43374461
0 UUS10
U9410710U
San Francisco1!0U 795 Folsom St, Suite 60010U
Twitter, Inc.10U
Twitter Security10U
?0? *?H?? twitter.com0?"0
???w?…?tSmZ ?T#7Tn,?l\C????
??^d?L?*q? ???\n*???*?X?[?????-?b?V?Ic[[ݙn??D??i;?j~,亵Ȯu?z۴Jz9qr??כ????G?#???u2j?7_;?3[Y?&?P???P?@?U?N?,?Tx?e?N???SVߝ???*!Po???Q???!??sIpҒ#`H??U'?"^?*?7
_?>???Z|`W?.p_??????p????v2?p????0?0'U 0?www.twitter.com?
twitter.com0 U00U?x?Fy?n?]@H?G???(?1?0
U?0BU;0907?5?3?1http://EVSecure-crl.verisign.com/EVSecure2006.crl0DU =0;09
`?H??E0*+https://www.verisign.com/rpa0U%+0U#0???P???%Z{U?O?c??XkC0+p0n0+0?!http://EVSecure-ocsp.verisign.com0+0?1http://EVSecure-aia.verisign.com/EVSecure2006.cer0+
b0`?^?\0Z0X0V image/gif0!00+Kk?(?
? ??*?H??K?!0&$http://logo.verisign.com/vslogo1.gif0
??Z
GD?𥛄8ݫ?NJnJXn?????]?? -";J?#O????
<r?Q&?.??;? F
?????K??Fq?mD?-?Sl??=3???]?.??=v?I???
???ѱ??)i?Y!K?L???GC??rI0IR??f!~
b4˼??]?b?????_5a=?-B¹ax???rif߰?j?[??j?????3???d?Ўo
kS
?m'?9????X?H???`ln?n%???ߍ5G?H?!w?+x:
?u?86K?[,!?z?ipŵh?4uf????/N? Dt?'\??d+A???]?? ??gqP???V{?0c?1??mKǫ??o;
@genufish
Copy link

genufish commented Aug 27, 2020

致敬前辈,TLS1.3正在普及中——ESNI功能将域名也加密了。有了依附的自由,今后流量伪装更方便了。

esni已经被封了

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment