[Spacewalk-list] GPG keys for CentOS channels in Spacewalk
Wenkai Chen
wenkai_chen at ensigninfosecurity.com
Wed Mar 4 09:25:13 UTC 2020
HI Stefan,
If the GPG check is done on the client side for the Spacewalk channel, does this mean that for each package downloaded from Spacewalk onto the Client, it is being signed by CentOS and that the client will use the GPG public key on its local file location to verify its integrity?
It doesn't do it. And I don't think it needs to (or you don't want to when mixing packages from different sources). You will latest notice the compromise when installing the package as it would then fail.
* What if GPG check is not enforced? What if the repo URL gets compromised?
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Chen Wenkai
Infrastructure Security Engineer
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E: wenkai_chen at ensigninfosecurity.com
A: 30A Kallang Place, Level 9 Right Wing, Singapore 339213
From: spacewalk-list-bounces at redhat.com <spacewalk-list-bounces at redhat.com> On Behalf Of Stefan Bluhm
Sent: Wednesday, 4 March 2020 4:59 PM
To: spacewalk-list <spacewalk-list at redhat.com>
Subject: Re: [Spacewalk-list] GPG keys for CentOS channels in Spacewalk
EXTERNAL: Caution this email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Hello Chen,
> So this means that in order to do GPG check for the clients, I would need to place the same GPG key on all registered clients on this channel at the same location? (file:///etc/pki/rpm-gpg/)
correct. Practically, this would only be necessary if the keys are not already imported into the rpm database (I import the keys on provisioning and never fill out the GPG key field).
> How does Spacewalk verify its integrity when it syncs its repositories for each channel? How does it ensure that the repo it syncs with have not been compromised?
It doesn't do it. And I don't think it needs to (or you don't want to when mixing packages from different sources). You will latest notice the compromise when installing the package as it would then fail.
Best wishes,
Stefan
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Von: "Wenkai Chen" <wenkai_chen at ensigninfosecurity.com<mailto:wenkai_chen at ensigninfosecurity.com>>
An: "spacewalk-list" <spacewalk-list at redhat.com<mailto:spacewalk-list at redhat.com>>
Gesendet: Mittwoch, 4. März 2020 09:50:03
Betreff: Re: [Spacewalk-list] GPG keys for CentOS channels in Spacewalk
HI Stefan,
Thanks.
So this means that in order to do GPG check for the clients, I would need to place the same GPG key on all registered clients on this channel at the same location? (file:///etc/pki/rpm-gpg/)
How does Spacewalk verify its integrity when it syncs its repositories for each channel? How does it ensure that the repo it syncs with have not been compromised?
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Chen Wenkai
Infrastructure Security Engineer
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From: spacewalk-list-bounces at redhat.com<mailto:spacewalk-list-bounces at redhat.com> <spacewalk-list-bounces at redhat.com<mailto:spacewalk-list-bounces at redhat.com>> On Behalf Of Stefan Bluhm
Sent: Wednesday, 4 March 2020 2:43 PM
To: spacewalk-list <spacewalk-list at redhat.com<mailto:spacewalk-list at redhat.com>>
Subject: Re: [Spacewalk-list] GPG keys for CentOS channels in Spacewalk
EXTERNAL: Caution this email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
Hello Chen,
the field GPG key on the channel setup is information for the package installer on the CLIENT.
It tells the package installer on the client where to find the GPG key for these packages. You have to enter it from the client point of view (in the same format the client would use it). So no URL. It must be a client local file location.
Best wishes,
Stefan
________________________________
Von: "Wenkai Chen" <wenkai_chen at ensigninfosecurity.com<mailto:wenkai_chen at ensigninfosecurity.com>>
An: "spacewalk-list" <spacewalk-list at redhat.com<mailto:spacewalk-list at redhat.com>>
Gesendet: Mittwoch, 4. März 2020 04:19:56
Betreff: [Spacewalk-list] GPG keys for CentOS channels in Spacewalk
HI Spacewalk users,
Sorry just would like to confirm.
When we enter GPG key into a channel on Spacewalk, does it mean that whenever we do a repo-sync, it does a gpg-check on all the packages downloaded and synced?
If there is no GPG key entered for a channel in Spacewalk, will there be a gpg-check?
If clients are registered to this channel on Spacewalk, will there be a gpg-check?
Thank you.
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Chen Wenkai
Infrastructure Security Engineer
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