Multiple (client-)peers with same keys possible ?

[Ivan Labáth]

Hi,

as said, I don't concieve a reasonable way of using the same key.
Wireguard routes and needs to identify and know its clients.

That said, I don't see a reason why the clients couldn't have similar
private keys.

e.g.

Server:

Private = PrivateKey

[Peer1]
Pubkey = secret_to_public(notreallysecret..001)
AllowedIPs = 172.16.0.1/16

[Peer2]
Pubkey = secret_to_public(notreallysecret..002)
AllowedIPs = 172.16.0.2/16


I would carefully consider security consequences and possible
alternatives before deploying such a scheme.

Cheers,
ivan


On Wed, May 16, 2018 at 08:50:35AM +1200, Eric Light wrote:
> Hi Reiner!
> 
> I can't figure out how that would work, considering WG is based around crypto-key routing.  How would it know where to route a given packet?
> 
> Additionally, two sets of AllowedIPs=0.0.0.0/0 would imply two different default routes.
> 
> I just don't see how that could function, tbh.  :)
> 
> E
> 
> --------------------------------------------
> Q: Why is this email five sentences or less?
> A: http://five.sentenc.es
> 
> On Wed, 16 May 2018, at 06:36, reiner otto wrote:
> > Is it possible somehow, to define multiple (client-)peers to share the 
> > same keys ?
> > (Trading some loss of security for simpler distribution)
> > 
> > I.e. on server:
> > [Interface]
> > ListenPort = 5000
> > PrivateKey = ABCD ...XYZ
> > Address=172.16.0.1
> > 
> > [Peer]
> > PublicKey = 1234...7890
> > AllowedIPs = 172.16.0.0/16
> > 
> > 
> > client1:
> > [Interface]
> > PrivateKey = top...secret
> > ListenPort = 5000
> > Address = 172.16.0.2
> > [Peer]
> > PublicKey = everybodyknows
> > AllowedIPs = 0.0.0.0/0
> > Endpoint = 1.2.3.4
> > 
> > client2:
> > [Interface]
> > PrivateKey = top...secret
> > ListenPort = 5000
> > Address = 172.16.0.3
> > [Peer]
> > PublicKey = everybodyknows
> > AllowedIPs = 0.0.0.0/0
> > Endpoint = 1.2.3.4
> > ....
> > ....
> > ....
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