Multi-Device Setup for easier onboarding / QR + noise

[hpk42]

Introduce functionality to core that helps to setup a second device with all contacts, chats, messages and crypto keys.
For this we need to establish a trusted network transport between two DC apps. Core could integrate libp2pin order to establish e2e-encrypted communication between two cores. The address information and a pre-shared key for the e2e-encryption could be transferred through a QR Code, for example a "Request Device Setup" code containing address info and maybe an ephemeral key. The existing DC device can scan this, the user is asked to confirm "do you want to transfer your setup to ..." and if so, will use libp2p and the QR-data to establish a safe connection between the two devices. With #1729 implemented we can then reuse the streamable export/import functionality to complete the setup of the second device.

This issue supsersedes #803 which discusses another way to establish a connection through WLAN with SKT (https://0xacab.org/dkg/openpgp-skt/blob/master/skt-server.c). Given that libp2p already exists as a crate and is used from several projects, it makes more sense to use that.

Update: See #1954 for a PR that was postponed; some work was already started there.
We first planned to use libp2p but the noise protocol is probably better.

[Hocuri]

Also see #1611.

[Hocuri]

@hpk42 As far as I can see that, libp2p works by specifying the ip address. Does this mean that we require the devices to be in the same wi-fi?

[Hocuri]

Or could we maybe use the webrtc connections that are being introduced for calls?

[hpk42]

problem with webrtc is that we don't have any network code in the core and it wouldn't be easy to get it in -- it's a rather complex stack. But yes, we could let the frontends try get a webrtc data connection.

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On Tue, Jul 28, 2020 at 00:58 -0700, Hocuri wrote: Or could we maybe use the webrtc connections that are being introduced for calls? -- You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub: #1731 (comment)

[link2xt]

Prototype of sending files with Rust using hypercore-protocol is at https://github.com/Frando/sendtar

[r10s]

this issue is a bit outdated, recent tests go towards using webrtc; moving issue to resurrection therefore.

[pt1997]

I've just been in the situation of setting up delta chat on three devices.
On iOS there was the option to scan a QR code for setup but i couldn't figure out where that code is in the desktop or android version.

Hence I needed to:

0. use the web interface of the Mail provider to enable IMAP and SMTP
1. enter the E-Mail address, password and server configuration
2. open the settings scroll down click "Send Autocrypt Setup Message"
3. type that long number in the new device
4. go to the settings there - My Profile - password and E-Mail - send copy to myself.
5. repeat 1-5.

It's not ideal if I want to get people to use Delta Chat and then it takes me 15 minutes to set it up. That doesn't make a good first impression.

[link2xt]

Recommended way currently is to setup one device, then take a backup and transfer it to other devices. This issue is about automating the process of backup transfer, currently you have to do it manually.

[dignifiedquire]

reopening, as I am working on this actively