Thursday, December 6, 2018

Bypassing website blocking/censorship with Secure DNS and Encrypted SNI (cloudflare only)

I haven't posted in a while, but today I have something interesting to share. Recently, multiple service providers that I use have started blocking some websites using deep packet inspection firewalls. Earlier, these firewalls would only block traffic by examining hostname in GET requests (which is easy to bypass by just using the https version of the target website), but now they employ some more techniques. Specifically, they block based on the SNI field of the TLS client hello, and sometimes also block on the basis of DNS queries. I was looking for ways to bypass these using custom extensions on my browser, but found out that it'll be a very non-trivial problem. Then I looked around and found that-


  1. Latest firefox Nightly builds (and maybe even mainline firefox) have support for DNS over HTTPS (so no DNS based blocking)
  2. Firefox has implemented the ESNI feature discussed in the drafts of TLS 1.3 (again, only available in Nightly build so far)
  3. Cloudflare has enabled ESNI.
I won't retell the whole tale, here are quick links-

The first link also has detailed steps on how to enable these features (plus explanation of what's actually happening). I'll surmise them quickly-

0. Get firefox nightly
1. Type about:config on the url bar.
2. Search for network.trr, change network.trr.mode to 2
3. Search for network.security.esni.enabled and set it to true

In all likelihood, your ISP/institution/etc will now not be able to block any website on cloudflare (a LOT of websites use cloudflare), as long as you use firefox nightly. With increased adoption of ESNI, more websites will be able to evade blocking.

(These steps won't work if you are in a workplace and the employer has installed his own certificate on the machines and uses a ssl proxy in conjunction with the firewall)

27 comments:

  1. Replies
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  8. definitely if you're getting a trusted ethical hacker to help you with hack or clone of your spouse phones or even their social media accounts, like messenger, whatsapp instagram, and mails, etc. especially for spouses in distant relationship I will recommend you to this hacker with the email address, superior.hack WITH . he has helped me on several hack jobs since my friend introduced him to me, he's been so spectacular. for obvious reasons, I would not want to go into details on how he's helped me hack my spouses social media accounts and even my friends when they gossip.
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    ReplyDelete
  15. this is me keeping to my word ,testifying to the good works of the hacker QUADHACKED @ G M A I L . C O M . he helped me fix my credit . i had history of late payment,  repossessions, Hard inquiries and few collections i acquired in my downtime while i was struggling. this affected my finances so bad i had blemishing lurking on my report for years . i started tackling each one buy one, and on one occasion i paid $5000 once in clearing a debt and even pay advances for some. this didn't move my score to any reasonable significance, as i proposed and needed . i was seeking a mortgage loan and needed over a +100 units in credit score increase .then i met this hacker QUADHACKED at GMAIL . COM . He helped me expunge blemishes  successfully and increase my credit score to 780.I was left amazed, i promised i will share on few blogs if he could help me with this . of course he did and helped several others i recommended to him. hence i'm sharing his contact email address which you can send a message ,describing  the credit repair services you're seeking .
    contact email
    Q U A D H A C K E D _at_ G MA I L . COM    

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