git https and github

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

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

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

On 25.04.18 02:32, Lev wrote:

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.

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)

Cheers, Beat