Custom TCTI

[stefanodevenuto]

Hi everyone!
I was wondering if in the library there's a way to indicate a custom TCTI to be used, like with the -T option using tpm2_tools, and, if not, if it would require major changes (the tools leverage dlopen() to load the .so provided)

Thanks a lot!

[Superhepper]

No, the TCTI options that currently exist are explicitly defined so there is no option that would allow for that currently I think.

[Superhepper]

I am not sure how the tpm2-tools do that but it would probably not be a major issue to implement the functionality but rather a bit of a hassle to add some kind of CI pipeline to test it.

[wiktor-k]

Hm... can't TctiNameConf::from_str be used for that?

I see it's used as part of TctiNameConf::from_environment_variable... or maybe I'm mixing it up with something else? 🤔

Edit: Just re-read the source code and of course the from_str fails for unknown TCTIs 🤦‍♂️ If there's some concrete use-case I think it would be a good idea to add a "catch-all" variant for free-form strings 🤔

[KarstenB]

Yes, please add a catch-all variant. I am currently unable to connect to a swtpm on a unix socket, which is really unfortunate.

[Superhepper]

What version are you using? Because If I am not mistaken on main and therefor in the upcoming 8.0.0 release. It is possible to use unix sockets.

[KarstenB]

I am on 7.7.0 which definitely doesn't support that just yet, but 8.0.0.alpha.2 does. I am switching to that for now, thanks for the tip.