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From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>, Julian Orth <ju.orth@gmail.com>
Cc: WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: network namespace wireguard routing [Was: Re: Userspace Networking Stack + WireGuard + Go]
Date: Wed, 13 Jan 2021 17:46:03 +0100	[thread overview]
Message-ID: <87v9c09450.fsf@toke.dk> (raw)
In-Reply-To: <CAHmME9rbUbEZah0MDtdRXhUxMtOSrcdo4BCN1LY-iDtXUWHy5Q@mail.gmail.com>

"Jason A. Donenfeld" <Jason@zx2c4.com> writes:

> In order to prevent this Go thread from being hijacked with Linux
> concerns, I've changed the Subject line of the email. Please keep
> follow ups in this thread rather than the other.
>
> Response is in line below:
>
> On Wed, Jan 13, 2021 at 5:26 PM Julian Orth <ju.orth@gmail.com> wrote:
>>
>> On 13/01/2021 17.04, Jason A. Donenfeld wrote:
>>
>>  > Even if you're unprivileged and want a WireGuard interface for just a
>>  > single application that's bound to the lifetime of that application,
>>  > you can still use WireGuard's normal kernel interface inside of a user
>>  > namespace + a network namespace, and get a private process-specific
>>  > WireGuard interface.
>>
>> That's what my patches from back in 2018 were trying to accomplish.
>> Unless I've missed something since, I do not see how what you're
>> describing would work.  Unless you also
>>
>> - create a TUN device in the network namespace
>> - add a default route through that TUN device
>> - manually route all traffic between the init network namespace and your
>>    network namespace.
>>
>> Is that what you meant or is there a simpler way?
>
> What I meant was:
>
> 1. User opens his shell and runs ./blah. That executes in the init
> namespace where all the physical interfaces are.
> 2. blah creates a wireguard interface.
> 3. blah creates a network namespace.
> 4. blah moves that wireguard interface into that network namespace.
> 5. blah calls `setns()` on one of its threads to use that network namespace.
>
> Thinking about this in more detail, I'm guessing you take issue with
> step #2? Since that actually might require privileges in the init
> namespace?

5. also requires CAP_SYS_ADMIN (and I think by extension, so does 3.,
and 4.). From 'man setns':

       Network, IPC, time, and UTS namespaces
              In order to reassociate itself with a new network, IPC,
              time, or UTS namespace, the caller must have the
              CAP_SYS_ADMIN capability both in its own user namespace
              and in the user namespace that owns the target namespace.

-Toke

  parent reply	other threads:[~2021-01-13 16:47 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 16:04 Userspace Networking Stack + WireGuard + Go Jason A. Donenfeld
2021-01-13 16:26 ` Julian Orth
2021-01-13 16:33   ` network namespace wireguard routing [Was: Re: Userspace Networking Stack + WireGuard + Go] Jason A. Donenfeld
2021-01-13 16:40     ` Julian Orth
2021-01-13 16:46     ` Toke Høiland-Jørgensen [this message]
2021-01-13 16:49       ` Jason A. Donenfeld
2021-01-14 10:44         ` Toke Høiland-Jørgensen
2021-01-15  8:12   ` Userspace Networking Stack + WireGuard + Go Marc-André Lureau
2021-01-14 23:25 ` Jason A. Donenfeld

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