RE: Multiple GIT Accounts & HTTPS Client Certificates - Config

["Randall S. Becker" <rsbecker@nexbridge.com>]

On September 10, 2018 4:09 AM, Sergei Haller wrote:
> my problem is basically the following: my git server (https) requires
> authentication using a clent x509 certificate.
> 
> And I have multiple x509 certificates that match the server.
> 
> when I access the https server using a browser, the browser asks which
> certificate to use and everything is fine.
> 
> When I try to access the git server from the command line (git pull or similar),
> the git will pick one of the available certificates (randomly or alphabetically)
> and try to access the server with that client certificate. Ending in the
> situation that git picks the wrong certificate.
> 
> I can workaround by deleting all client certificates from the windows
> certificate store except the "correct" one => then git command line will pick
> the correct certificate (the only one available) and everything works as
> expected.
> 
> Workaround is a workaround, I need to use all of the certificates repeatedly
> for different repos and different other aplications (non-git), so I've been
> deliting and reinstalling the certificates all the time in the last weeks...
> 
> How can I tell git cmd (per config option??) to use a particular client
> certificate for authenticating to the https server (I could provide fingerprint
> or serial number or sth like that)
> 
> current environment: windows 10 and git version 2.18.0.windows.1
> 
> Would be absolutely acceptable if git would ask interactively which client
> certificate to use (in case its not configurable)
> 
> (I asked this question here before:
> https://stackoverflow.com/questions/51952568/multiple-git-accounts-
> https-client-certificates-config
> )

Would you consider using SSH to authenticate? You can control which private key you use based on your ~/.ssh/config entries, which are case sensitive. You can choose the SSH key to use by playing with the case of the host name, like:

github.com
Github.com
gitHub.com

even if your user is "git" in all cases above. It is a bit hacky but it is part of the SSH spec and is supported by git and EGit (as of 5.x).

Cheers,
Randall

--
Randall S. Becker
Managing Director, Nexbridge Inc.
LinkedIn.com/in/randallbecker
+1.416.984.9826