Re: git https and github

From: Beat Bolli <dev+git@drbeat.li>
Date: Apr 25, 2018, 17:44 UTC
Message-ID: <f1f59f0d-711c-f8e5-8bc1-13db49f7101b@drbeat.li>
In-Reply-To: <20180425023208.5e76e93d@jive>

On 25.04.18 02:32, Lev wrote:

Show 16 quoted lines

> Hi list,
> 
> 
> I'm struggling with git connecting to Github.
> 
> The problem might be SSL/TLS related.
> 
> https://githubengineering.com/crypto-removal-notice/
> 
> I suspect that my setup still uses tlsv1 or tlsv1.1.
> 
> I've tried to explicitly set git to use tlsv1.2 in my .gitconfig file
> like this:
> 
> [http]
> 	sslVersion = tlsv1.2

This is the default, so this setting should not be needed, unless it's overridden in some higher prioritized git config file. Have you tried

    git -c http.sslVersion=tlsv1.2 clone <URL>

? This should override any settings files.

Show 49 quoted lines

> I've tried to re-compile git with OpenSSL and GnuTLS. All give the
> same error.
> 
> git clone https://github.com/OnionIoT/source.git
> Cloning into 'source'...
> * Couldn't find host github.com in the .netrc file; using defaults
> *   Trying 192.30.253.112...
> * TCP_NODELAY set
> * Connected to github.com (192.30.253.112) port 443 (#0)
> * ALPN, offering http/1.1
> * Cipher selection:
> ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
> * successfully set certificate verify locations:
> *   CAfile: /etc/ssl/certs/ca-certificates.crt
>   CApath: /etc/ssl/certs
> * error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol
> version
> * Curl_http_done: called premature == 1
> * stopped the pause stream!
> * Closing connection 0
> fatal: unable to access 'https://github.com/OnionIoT/source.git/':
> error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol
> version lev@jive:~/git$ unset GIT_SSL_VERSION lev@jive:~/git$ git clone
> https://github.com/OnionIoT/source.git Cloning into 'source'...
> * Couldn't find host github.com in the .netrc file; using defaults
> *   Trying 192.30.253.112...
> * TCP_NODELAY set
> * Connected to github.com (192.30.253.112) port 443 (#0)
> * ALPN, offering http/1.1
> * Cipher selection:
> ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
> * successfully set certificate verify locations:
> *   CAfile: /etc/ssl/certs/ca-certificates.crt
>   CApath: /etc/ssl/certs
> * error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol
> version
> * Curl_http_done: called premature == 1
> * stopped the pause stream!
> * Closing connection 0
> fatal: unable to access 'https://github.com/OnionIoT/source.git/':
> error:1409442E:SSL routines:ssl3_read_bytes:tlsv1 alert protocol version
> 
> 
> I can connect to other git servers without any error. This is a debian
> stable system with the following components:
> 
> 	git version 2.11.0
> 	libcurl 7.52.1
> 	OpenSSL 1.0.2l

This OpenSSL version is certainly recent enough to support TLSv1.2. Are you sure you ran the newly compiled git binary?

(Sorry for asking stupid questions; it's sometimes difficult to get to the root of a problem)

Show 8 quoted lines

> 
> 
> Is there any way to know what is the exact protocol used? Are there any
> workaround, fix for this issue?
> 
> Any help welcome. Thank you,
> Levente
>

Cheers, Beat