[OMEMO] Protected MUC Room problem, if alone -> OMEMO is forcing: *** [OMEMO] Unable to build any sessions, the message was not sent

[Neustradamus]

When we are on a protected MUC Room, after an OMEMO discussion with several people, if we are the last people (alone):

• OMEMO icon: Grey "OMEMO is not available for this contact"

When we send a message:

• *** [OMEMO] Unable to build any sessions, the message was not sent

-> Impossible to disable OMEMO (icon is in grey)

Linked to:

• *** [OMEMO] Unable to build any sessions, the message was not sent (Myself message does not work) | Identical chat tab | Identical device #49
• OMEMO is forcing: *** [OMEMO] Unable to build any sessions, the message was not sent #54
• [OMEMO] Protected MUC Room problem, if alone -> OMEMO is forcing: *** [OMEMO] Unable to build any sessions, the message was not sent #57
• [OMEMO] Problem if a new roster contact has not OMEMO and the contact enables OMEMO in the talk #67
• [OMEMO] Unable to build any sessions, the message was not sent psi#630

[tehnick]

Try Psi+ 1.4.1299 or newer please.

[Neustradamus]

@kssytsrk: Can you look this ticket?

[kssytsrk]

Can reproduce on Psi+ 1.5.1551 (2021-08-16) / FreeBSD 13.0, but isn't this expected behavior? I don't think it'd be troublesome to implement OMEMO-encrypting the message using sender's own key, just not sure if it's needed/conforming to the XEP (here, for example, it is specified that the messages should be encrypted using the recipients' keys and the keys of sender's other devices). Have you tested this with any other clients (Gajim, Dino, Conversations?), do they implement this?

[Neustradamus]

I have done a new ticket, now we are not "OMEMO forced" with last commits from @nullobsi and @stigger (thanks) but the problem is always here when the last try to send an OMEMO message in MUC Room (and the error is now showed for myself OMEMO messages that were not showed before, invisible).

Linked to:

• *** [OMEMO] Unable to build any sessions, the message was not sent (Myself message does not work) | Identical chat tab | Identical device #49
• *** [OMEMO] Unable to build any sessions, the message was not sent (Last in Protected MUC Room) #114