From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DATE_IN_PAST_12_24, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37ECBC56202 for ; Wed, 28 Oct 2020 21:46:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2BAB24724 for ; Wed, 28 Oct 2020 21:46:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=paul-moore-com.20150623.gappssmtp.com header.i=@paul-moore-com.20150623.gappssmtp.com header.b="Lj2eTMWd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726175AbgJ1Vq3 (ORCPT ); Wed, 28 Oct 2020 17:46:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725446AbgJ1Vq2 (ORCPT ); Wed, 28 Oct 2020 17:46:28 -0400 Received: from mail-lf1-x143.google.com (mail-lf1-x143.google.com [IPv6:2a00:1450:4864:20::143]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 345FFC0613CF for ; Wed, 28 Oct 2020 14:46:28 -0700 (PDT) Received: by mail-lf1-x143.google.com with SMTP id j30so712248lfp.4 for ; Wed, 28 Oct 2020 14:46:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=paul-moore-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=EhaQv7Xqn9C10/6kPilmFG/LY90YB69CHHSm/P4LmUk=; b=Lj2eTMWdQNRX51rp+69kJ+7MIJveC7lv8t0w/6GAwNCZDU97tO7fXzTZewOx55Ac1l qfo9NYf3w/1oZOOMsUpmk5QFBOLD6rEq4Y+xGwdcqgYSlAvt/V1eCOoLhOGtMpxn22lY BpPv8So2RSzkwV4VqW9Z81xo/sm6G/2qErp4megpsjRLRnCsLMimzT//EYKnBmWXYPYY Sljt2SxpJGW+CX70ABsj4p+oWaehsd7e48Xa9uvPlScUQdjQsFInIzQICwjOLHYNYT2Z rVKc0MWZtpSmx99XULBfKIiPaFC7zAwivfy+JYaPy+FhDaqHk6y3p83LlgRiUo5yGc2I JWSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=EhaQv7Xqn9C10/6kPilmFG/LY90YB69CHHSm/P4LmUk=; b=EYjYDYY1ctc46EOutr7JZd9aRJTKlhVZqkqltG/UQy60RXhgjXL/jqTSR5sUQwCUt9 oByKC0SJr0njWvSBX9pgTKuxwzSQ5JNZ2i6j+9YJZw0xEuttyQ0ggEKyv5SKsuHZ0wao UoHy3wENdyN06SD0ixHDOsOUtLAgCsCf1KSH7rfmrhQ0wSrMrZfe1O3bi/28XTukwJwh 8iQW8TxFYghEWvDashBIZAfQyC0vpU+uyGyEpQhuO8U9Z95qMXW8crr3jdIOHVlBp2pl aLzAREtIKgOjlin7utUELQbB3kaG6mM5xioOfO0sH/h0PCs1Yjj54gan1r9j1NhViH67 1rnw== X-Gm-Message-State: AOAM531SNbbDBAe2E9+mEg+b6uno2MBLOuDjY5u+4qJLR62Gfjs4Mo8d ARPcalyN7MODG9OhUN5Dq1L/XtviscT+UTkqHLfx9Ihdvw== X-Google-Smtp-Source: ABdhPJydImqf6rjIcFvdKoVKRijlUJM6c3tT5+zpyIh0DgksT/WwCUJmb9M0MAWnaqlVZBE1LbPiRD1v+2NmrHAlBa8= X-Received: by 2002:a17:906:4811:: with SMTP id w17mr4982322ejq.431.1603848928683; Tue, 27 Oct 2020 18:35:28 -0700 (PDT) MIME-Version: 1.0 References: <6e2e10432e1400f747918eeb93bf45029de2aa6c.1593198710.git.rgb@redhat.com> <20200729194058.kcbsqjhzunjpipgm@madcap2.tricolour.ca> <20201002195231.GH2882171@madcap2.tricolour.ca> <20201021163926.GA3929765@madcap2.tricolour.ca> <20201023204033.GI2882171@madcap2.tricolour.ca> In-Reply-To: <20201023204033.GI2882171@madcap2.tricolour.ca> From: Paul Moore Date: Tue, 27 Oct 2020 21:35:17 -0400 Message-ID: Subject: Re: [PATCH ghak90 V9 05/13] audit: log container info of syscalls To: Richard Guy Briggs Cc: nhorman@tuxdriver.com, linux-api@vger.kernel.org, containers@lists.linux-foundation.org, LKML , dhowells@redhat.com, Linux-Audit Mailing List , netfilter-devel@vger.kernel.org, ebiederm@xmission.com, simo@redhat.com, netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, Eric Paris , mpatel@redhat.com, Serge Hallyn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Fri, Oct 23, 2020 at 4:40 PM Richard Guy Briggs wrote: > On 2020-10-22 21:21, Paul Moore wrote: > > On Wed, Oct 21, 2020 at 12:39 PM Richard Guy Briggs wr= ote: > > > Here is an exmple I was able to generate after updating the testsuite > > > script to include a signalling example of a nested audit container > > > identifier: > > > > > > ---- > > > type=3DPROCTITLE msg=3Daudit(2020-10-21 10:31:16.655:6731) : proctitl= e=3D/usr/bin/perl -w containerid/test > > > type=3DCONTAINER_ID msg=3Daudit(2020-10-21 10:31:16.655:6731) : conti= d=3D7129731255799087104^3333941723245477888 > > > type=3DOBJ_PID msg=3Daudit(2020-10-21 10:31:16.655:6731) : opid=3D115= 583 oauid=3Droot ouid=3Droot oses=3D1 obj=3Dunconfined_u:unconfined_r:uncon= fined_t:s0-s0:c0.c1023 ocomm=3Dperl > > > type=3DCONTAINER_ID msg=3Daudit(2020-10-21 10:31:16.655:6731) : conti= d=3D3333941723245477888 > > > type=3DOBJ_PID msg=3Daudit(2020-10-21 10:31:16.655:6731) : opid=3D115= 580 oauid=3Droot ouid=3Droot oses=3D1 obj=3Dunconfined_u:unconfined_r:uncon= fined_t:s0-s0:c0.c1023 ocomm=3Dperl > > > type=3DCONTAINER_ID msg=3Daudit(2020-10-21 10:31:16.655:6731) : conti= d=3D8098399240850112512^3333941723245477888 > > > type=3DOBJ_PID msg=3Daudit(2020-10-21 10:31:16.655:6731) : opid=3D115= 582 oauid=3Droot ouid=3Droot oses=3D1 obj=3Dunconfined_u:unconfined_r:uncon= fined_t:s0-s0:c0.c1023 ocomm=3Dperl > > > type=3DSYSCALL msg=3Daudit(2020-10-21 10:31:16.655:6731) : arch=3Dx86= _64 syscall=3Dkill success=3Dyes exit=3D0 a0=3D0xfffe3c84 a1=3DSIGTERM a2= =3D0x4d524554 a3=3D0x0 items=3D0 ppid=3D115564 pid=3D115567 auid=3Droot uid= =3Droot gid=3Droot euid=3Droot suid=3Droot fsuid=3Droot egid=3Droot sgid=3D= root fsgid=3Droot tty=3DttyS0 ses=3D1 comm=3Dperl exe=3D/usr/bin/perl subj= =3Dunconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=3Dtestsuite-16= 03290671-AcLtUulY > > > ---- > > > > > > There are three CONTAINER_ID records which need some way of associati= ng with OBJ_PID records. An additional CONTAINER_ID record would be presen= t if the killing process itself had an audit container identifier. I think= the most obvious way to connect them is with a pid=3D field in the CONTAIN= ER_ID record. > > > > Using a "pid=3D" field as a way to link CONTAINER_ID records to other > > records raises a few questions. What happens if/when we need to > > represent those PIDs in the context of a namespace? Are we ever going > > to need to link to records which don't have a "pid=3D" field? I haven'= t > > done the homework to know if either of these are a concern right now, > > but I worry that this might become a problem in the future. > > Good point about PID namespaces in the future but those accompanying > records will already have to be conditioned for the PID namespace > context that is requesting it, so I don't see this as a showstopper. Possibly, it just gets very messy. Doubly so when you start looking at potentially adjusting for multiple audit daemons. Thankfully it doesn't look like using the PID is a good idea for other reasons. > I've forgotten about an important one we already hit, which is a network > event that only has a NETFILTER_PKT record, but in that case, there is > no ambiguity since there are no other records associated with that > event. So the second is already an issue now. Using > task_tgid_nr(current), in the contid testsuite script network event it > attributed it to ping which caused the event, but we cannot use this > since it wasn't triggered by a syscall and doesn't accurately reflect > the kernel thread that received it. It could just be set to zero for > network events. Possibly. It just seems like too much hackery to start; that's the stuff you do once it has been in a kernel release for years and need to find a workaround that doesn't break everything. I think we should aim a bit higher right now. > > The idea of using something like "item=3D" is interesting. As you > > mention, the "item=3D" field does present some overlap problems with th= e > > PATH record, but perhaps we can do something similar. What if we > > added a "record=3D" (or similar, I'm not worried about names at this > > point) to each record, reset to 0/1 at the start of each event, and > > when we needed to link records somehow we could add a "related=3D1,..,N= " > > field. This would potentially be useful beyond just the audit > > container ID work. > > Does it make any sense to use the same keyword in each type of record > such as record/records as in PATH/SYSCALL: item/items ? That was mentioned above, if you can assure yourself and the rest of us that it can be safely reused I think that might be okay, but I'm not convinced that is safe at the moment. Although I will admit those are fears are not based on an exhaustive search through the code (or a determined "think"). > (I prefer 0-indexed like item=3D...) I have no preference on where we start the index, but it makes sense to keep the same index starting point as the PATH records. --=20 paul moore www.paul-moore.com