Comments (23)
Currently, Google Chrome 120 version has added ECH
from utls.
a browser that has implemented it yet
the latest Firefox is said to be shipped with ECH enable iff DNS-over-HTTPS is correctly configured.
from utls.
Cloudflare make a blog post about it
https://blog.cloudflare.com/announcing-encrypted-client-hello/ with browser support upcoming
- Chrome https://chromestatus.com/feature/6196703843581952
- FF https://groups.google.com/a/mozilla.org/g/dev-platform/c/uv7PNrHUagA/m/BNA4G8fOAAAJ
from utls.
Most sites do cause issues, if you do not provide the extension.
Would you like to elaborate? Which sites cause issues and what kinds of issue.
My impression is that none of the TLS extensions should be mandatory. Especially a draft extension in no case should be required in anyways.
So far the work on this extension is not prioritized, given that it is not yet generically available, plus it is not yet solidified into an IETF standard.
But again, we are open to pull requests adding new extensions.
from utls.
And I am open to merging changes from the hard fork on cloudflare/go by cloudflare , maybe with necessary modification/changes. The LICENSE looks compatible to me (BSD-3-Clause) and their implementation has a fairly assured quality.
I haven't looked into how much additional work will be required on uTLS to support ECH, but it shouldn't be too bad comparing to supporting PSK and post-quantum key share (kyber768-ed25519) in uTLS, which has been handled with a satisfactory standard thanks to the community.
In order to replicate the Ja3 of google chrome, you need the ECH extension else most cloudflare sites block you based on that.
from utls.
So as the first step, today we merged #266 to add the GREASE ECH extension. For pure parroting purposes, this should suffice.
We will keep holding onto the full ECH implementation until fully ECH is fairly common...
Now available in v1.6.0, cheers🥂
from utls.
So as the first step, today we merged #266 to add the GREASE ECH extension. For pure parroting purposes, this should suffice.
We will keep holding onto the full ECH implementation until fully ECH is fairly common...
Now available in v1.6.0, cheers🥂
Wow, you are so great!
from utls.
You can take a look at cloudflare/go@9ea1834 and then
from utls.
There doesn't seem to be a corresponding implementation
from utls.
"extensionEncryptedClientHello (boringssl) (65037)," extended
cloudflare/go@9ea1834#diff-f93ae351e135c874558cc63997db12a4c2c4d220f3bb2be84ecf6c808b2b9599R126
0xfe0d
is 65037
in decimal, and ECH is the abbreviation of EncryptedClientHello, why are you saying it does not correspond?
from utls.
Thank you, I see! Does adding this extension allow for faster validation of akamai waf?
from utls.
Probably not; I don't know a browser that has implemented it yet (if it does, it's behind a feature flag), and the RFC is still in draft, so I doubt they use it as a signal or give a faster validation since 99% of traffic do not have it
from utls.
But yeah it is probably a great idea to implement ECH for uTLS. PR is welcome.
from utls.
Can be like "FakeDelegatedCredentialsExtension", implement a placeholder. It is not clear how ECH is implemented
from utls.
how ECH is implemented
I believe that the cloudflare/go actually have it implemented in full. If interested someone may just port it. The License should be compatible.
from utls.
Can you transplant him? I am not familiar with golang at the moment
from utls.
In case you are asking if I (or anyone from the refraction team) will port this feature from cloudflare, the answer is no, currently we are all at capacity and adding an optional feature is not prioritized.
But if anyone from the community would like to open a pull request on that, I will be happy to review it.
from utls.
It might be a good time to start discussing how significant is it for uTLS to support ECH and what does a sense-making configurable interface look like in uTLS for ECH.
from utls.
hi, is there any update to this extension? Most sites do cause issues, if you do not provide the extension
from utls.
And here's my 2 cents on implementing extensionEncryptedClientHello:
I still believe there are good reason to hold onto this feature even though cloudflare might already have a readily available implementation, until ECH is fairly popular among TLS servers (instead of just the top 2 web browsers, which are considered TLS clients).
Once uTLS, or any popular circumvention tool started exploiting ECH to circumvent DPI-based blocking, censors may respond by blocking/disabling it completely with little to no collateral damage.
Btw we already saw reports showing some strong censors blocking the DNS-over-HTTPS, which is usually considered a prerequisite of successful ECH bootstrapping.
from utls.
And I am open to merging changes from the hard fork on cloudflare/go by cloudflare , maybe with necessary modification/changes. The LICENSE looks compatible to me (BSD-3-Clause) and their implementation has a fairly assured quality.
I haven't looked into how much additional work will be required on uTLS to support ECH, but it shouldn't be too bad comparing to supporting PSK and post-quantum key share (kyber768-ed25519) in uTLS, which has been handled with a satisfactory standard thanks to the community.
from utls.
you need the ECH extension else most cloudflare sites block you based on that
If I understand correctly: when you advertise your support of ECH using the GenericExtension
, cloudflare will not be able to complete the handshake correctly. It is pretty much expected. But are there any compelling reason to not just simply give up advertising it? i.e., why do you want to parrot this version of Google Chrome.
The "needs for parrot" again leads to my concern: how popular is the ECH extension on TLS clients and how popular is ECH support on TLS servers? Without an assuring answer, I am afraid implementing ECH too soon in circumvention community will lead to the minimal collateral damage when trivially blocking ECH. The best bet is for us to we wait until ECH become a default behavior for the vast majority of benign TLS clients/servers, so it doesn't become a strong fingerprintable feature.
from utls.
Currently, Google Chrome 120 version has added ECH
Could you please double check if Chrome 120 sends a greased ECH extension if prerequisite for ECH is not met? i.e., if no DoH configured, if target domain is not configured to support ECH, etc.
from utls.
Related Issues (20)
- [BUG] (Fake|Utls)PreSharedKeyExtension HOT 30
- Please, bump the major version number when you break the API HOT 5
- PSK resumption and ClientHelloRetry HOT 1
- Unable to set `OmitEmptyPsk` in `PreSharedKeyExtension` HOT 3
- Conn.readRecord(...) with multiple goroutine error HOT 1
- Cannot handshake with speed.hetzner.de HOT 4
- Cannot install in Docker base image alpine (package crypto/ecdh is not in GOROOT) HOT 5
- panic: tls: setSessionTicketExt failed: invalid state HOT 3
- Support for padding extension HOT 6
- feat: GREASE ECH Extension HOT 4
- bump Auto parrot for Firefox and Chrome
- bug: configuration for GREASE ECH parrot for Chrome 120 doesn't match BoringSSL HOT 7
- HelloFirefox* gets an ECDSA verification failure HOT 4
- FingerprintClientHello support for GREASE ECH extension
- Weird observation regarding ClientId and Spec HOT 9
- B uTLS does not support 0xFB1A as max version,add ja3 tls error,roundTripper error HOT 7
- crypto/ecdh is not in GOROOT (Go 1.18) HOT 1
- Secured Renegotiation is not supported HOT 10
- What is the hash function of the fingerprint in utls? HOT 6
- HTTP2 (akamai) fingerprint always same? HOT 1
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from utls.