Matrix: Support for encrypted chatrooms

[BenWiederhake]

The bridge currently doesn't support encryption, because gomatrix doesn't support it, and doesn't plan to support it anytime soon: matrix-org/gomatrix#31 (comment)

By now, Rooms on Matrix are encrypted by default, which is why I "reopen" the old issue (#170).

Maybe it's a good idea to switch to mautrix-go, because it supports E2EE, and it's based on gomatrix (so hopefully migration will be easy).

I could try to migrate it myself, but before I put any effort into that I'd first like to hear what @42wim thinks about this.

In case anyone is interested, this is the current situation:

• Sending to an unencrypted Matrix room works fine
• Receiving from an unencrypted Matrix room works fine
• Sending to an encrypted Matrix room works, but the message is displayed as "(!) Unencrypted" to other Matrix users
• Receiving from an encrypted Matrix room doesn't work, ./matterbridge -debug shows no output whatsoever.

[qaisjp]

Have you tried setting this up? https://github.com/matrix-org/pantalaimon

Not convenient that it uses Python, though.

[TheHolyRoger]

@BenWiederhake have you done any work on this yet? would be happy to move to mautrix-go since gomatrix aren't puling their finger out

[BenWiederhake]

I haven't, because I haven't heard anything from go-matrix. I'd be very happy if you can do this.

[TheHolyRoger]

I had a look last night and it really doesn't look too difficult, and I'm a GO noob... @42wim any thoughts on this? I'd be happy to help out, I learn quick :)

[42wim]

@TheHolyRoger i'm open for PR's to fix this, I don't mind going to mautrix-go but it should also support the extra stuff I've added to matrix-go.
I don't have the time at the moment to do this myself.

[Mikaela]

If I understand this blog post correctly, Matrix-org itself isn't using go-matrix anymore having switched to mautrix-go.

• https://matrix.org/blog/2020/09/08/gsoc-report-e-2-e-encryption-for-go-neb

[BenWiederhake]

Excellent! Even more reason to switch to mautrix-go.

[unode]

Keeping an eye on this as we would be interested in having support for encrypted rooms. Thanks to everyone making it possible.

[BenWiederhake]

As a workaround, you can use pantalaimon: https://github.com/42wim/matterbridge/wiki/Section-Matrix-%28basic%29#example-with-pantalaimon