[edk2-devel] Question about EDK2 and commit signing

[Marvin Häuser]

Hey Pedro,

Same point as before really, why would an attacker have access to your 
SSH key but not your GPG key? This scenario leaves out the possibly of 
an HTTPS over SSH attack, in which case as a security-aware person you 
use 2FA of course ( :) ), which means this is not possible without 
creating a personal access token. There is very little reason to do this 
at all - I never did this before, and I don't know anyone who does this 
with their private or work GitHub account (I think a few use it for 
CI?), at least that I know of. And even if you need one, and you give it 
push rights to actually push with, and you require GPG signatures 
globally, you again are keeping those two factors at least close 
together, if not in the same spot.

Best regards,
Marvin

On 13/09/2021 18:50, Pedro Falcato wrote:
> Hi James, Marvin,
>
> Interesting points of view.
> I still have a question though: If any part of the process got
> compromised (maintainer, or in the worst case scenario, the repo
> itself), is there anything that could be done
> in order to assess the damage? I'd say signing could help establish
> trust in a lot of those cases
>
> Thanks,
> Pedro
>
> On Sun, Sep 12, 2021 at 10:53 AM Marvin Häuser <mhaeuser at posteo.de> wrote:
>> Hey,
>>
>> Just my 2 cents...
>>
>> Contributors: Git's stance is the author doesn't really matter as long
>> as the code is acceptable. For most people, you will not know them
>> anyway and it does not buy you much to know they own GitHub account XY.
>> If someone is impersonating a maintainer (who would push the changes
>> directly after review), that would be obvious anyway.
>>
>> Maintainers: Why would someone have access to your SSH key but not your
>> GPG key? Especially if your commits are auto-signed, both keys are
>> likely equally readable. More factors do not meaningfully increase
>> security if they are not clearly separate.
>>
>> I'm sure nobody minds your signatures though. :)
>>
>> Best regards,
>> Marvin
>>
>> On 11/09/2021 20:25, Pedro Falcato wrote:
>>> Hi everyone,
>>>
>>> Yesterday, when pushing my first commits to edk2-platforms (as the
>>> Ext4Pkg maintainer), I noticed that my commits (see 7872c98 and
>>> 71f3343) stick out like a sore thumb, as I have GPG signing on my
>>> commits on by default (see git config commit.gpgsign), globally across
>>> all my projects.
>>>
>>> Is there an official stance on signed commits? I was thinking that
>>> commit signing, at least for the maintainers that apply and push
>>> patches, could be useful as a way to establish authenticity for every
>>> commit that gets to the edk2 repos.
>>>
>>> Best regards,
>>>
>>> Pedro Falcato
>>>
>>>
>>> 
>>>
>>>
>



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