Gentoo Archives: gentoo-security

From: Kurt Lieber <klieber@g.o>
To: Chris Frey <cdfrey@×××××××××.ca>
Cc: gentoo-security@l.g.o
Subject: Re: [gentoo-security] Re: Re: Is anybody else worried about this? (was: Trojan for Gentoo, part 2)
Date: Mon, 08 Nov 2004 01:19:40
Message-Id: 20041108011915.GQ10927@mail.lieber.org
In Reply to: [gentoo-security] Re: Re: Is anybody else worried about this? (was: Trojan for Gentoo, part 2) by Chris Frey
1 On Sun, Nov 07, 2004 at 08:03:36PM -0500 or thereabouts, Chris Frey wrote:
2 > I just downloaded a fresh portage tree to take a look, and I notice
3 > that signatures are making their way into the Manifest files. Is this
4 > an automated process? If so, can we expect all the Manifest files to
5 > soon be signed?
6
7 It's largely automated, yes. It still requires the developer committing
8 the ebuild to take the time to set up their system appropriately. A doc
9 explaining the necessary steps is available here:
10
11 http://dev.gentoo.org/~genone/docs/manifest-signing.txt
12
13 > Wouldn't it be sufficient to put a Manifest file in the eclass/ directory
14 > and sign it as well?
15
16 Entirely possible. I'm not a python programmer, so I don't know how
17 hard/easy this would be to implement.
18
19 > I note you mention this often, and I do appreciate the need for people
20 > to join in and help out. The main roadblock to implementing new signing
21 > procedures, for the outsider, is that it requires access to the server
22 > to implement the signing, or it requires participation from all devs,
23 > depending on the method chosen.
24 >
25 > Given this roadblock, I don't think it is completely fair to lay this job
26 > at users' feet.
27
28 I'm not laying anything at anyone's feet. What I'm trying to say is that
29 the only way this problem will ever get fixed is if someone who cares about
30 it devotes the time to fixing it.
31
32 > What I'm trying to say is that signing doesn't have to be implemented for
33 > the end user in portage before it is implemented on the server. Once the
34 > signatures are available on the server, all this talk would go away, and
35 > those that are concerned would do the checks, and those that aren't
36 > wouldn't. The concerned would likely share their checking scripts as well.
37
38 Back when signing was first being discussed, a conscious decision was made
39 to avoid server-based signing, specifically because it was felt that
40 offered a false sense of security. It didn't ensure integrity between the
41 developer's machine and the master cvs repository. Per-dev signing, on the
42 other hand, did.
43
44 Thus, the current signing model in portage requires each dev to sign their
45 own stuff and I don't think veering away from that strategy simply to
46 implement something in a hurry is a very wise choice.
47
48 Also, signing things on the server isn't as easy as folks have made it out
49 to be. A simple cron'd find command isn't going to cut it. Every time a
50 dev commits something to CVS, a new signature for that file has to be
51 generated immediately. Otherwise, 30 minutes later, you're going to have
52 problems when those changes make their way out to the rsync tree. Thus,
53 it's going to have to be integrated into repoman which means changes to
54 portage.
55
56 > So, I'm quite happy that there are experimental features in portage that
57 > deal with this, but I'd be even happier if every Manifest file in the
58 > portage tree was signed, even if portage code didn't do the checks yet.
59
60 Signing of ebuilds is coming. The foundation is being laid and, once that
61 is stabilized, the push to get all devs to sign their ebuilds will
62 commence.
63
64 --kurt