Combine Informations

[thomas-v2]

Hi,

I'm working also on a driver, which is only supporting TLS (using OpenSSL). But I've done most of the high level stuff (low level is in rough shape). Maybe we can combine it? I would be willing to change the license from LPGL to a more freely one.

[bonk-dev]

I'm going to upload this lib to Nuget soon so you will be able to use it (no need to change the license, since HarpoS7 is using MIT). I can help you with integrating it into your driver later on.

[mycroes]

May I chime in as well? I'm the maintainer of S7NetPlus and creator of Sally7, I'm very interested in at least getting Sally7 to a more modern protocol version. Both libraries are MIT licensed.

[thomas-v2]

I've got a running version, but it does only support TLS supporting CPUs:

https://github.com/thomas-v2/S7CommPlusDriver

Even if you want to connect to a password protected CPU with TLS, you'd need parts of the authentication used in this HarpoS7 library. CPU password authentication uses a different string to build another derivative key, as far as I know.

[bonk-dev]

@thomas-v2 I didn't look into the password auth yet, but during my reverse-engineering sessions I did see a different derive function - I will take a look at it when I have some free time later.

@mycroes Sure! I do know S7NetPlus - I've contributed some code myself. I'm working on releasing an actual public key store so that anyone can download the lib from nuget and use it as is, without dumping anything.

[mycroes]

@bonk-dev Yeah I recognized your name and profile pic. I think I've also been in (short) contact with Thomas in 2019, but back then he didn't feel much for supporting work on a C# implementation 😉. Anyway, I still have a lot of catching up to do on all this, I currently have no clue how different S7ComPlus is from the legacy S7 protocol, but it's something I'd very much like to support.

[bonk-dev]

@thomas-v2 I finally found some time to look into password auth. I was planning on making a doc on how it works but I'm drained for now. I pushed my changes to main and uploaded the new version to nuget.