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* apparmor: Add pasta's own profileStefano Brivio2023-09-073-10/+31
| | | | | | | | | | | | | | | | | | | If pasta and pasta.avx2 are hard links to passt and passt.avx2, AppArmor will attach their own profiles on execution, and we can restrict passt's profile to what it actually needs. Note that pasta needs to access all the resources that passt needs, so the pasta abstraction still includes passt's one. I plan to push the adaptation required for the Debian package in commit 5bb812e79143 ("debian/rules: Override pasta symbolic links with hard links"), on Salsa. If other distributions need to support AppArmor profiles they can follow a similar approach. The profile itself will be installed, there, via dh_apparmor, in a separate commit, b52557fedcb1 ("debian/rules: Install new pasta profile using dh_apparmor"). Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* apparmor: Allow pasta to remount /proc, access entries under its own copyStefano Brivio2023-09-071-0/+7
| | | | | | | | | | Since commit b0e450aa8500 ("pasta: Detach mount namespace, (re)mount procfs before spawning command"), we need to explicitly permit mount of /proc, and access to entries under /proc/PID/net (after remount, that's what AppArmor sees as path). Fixes: b0e450aa8500 ("pasta: Detach mount namespace, (re)mount procfs before spawning command") Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* apparmor: Allow read-only access to uid_mapStefano Brivio2023-09-071-0/+2
| | | | | | | | | | | | | | Starting with commit 770d1a4502dd ("isolation: Initially Keep CAP_SETFCAP if running as UID 0 in non-init"), the lack of this rule became more apparent as pasta needs to access uid_map in procfs even as non-root. However, both passt and pasta needs this, in case they are started as root, so add this directly to passt's abstraction (which is sourced by pasta's profile too). Fixes: 770d1a4502dd ("isolation: Initially Keep CAP_SETFCAP if running as UID 0 in non-init") Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* apparmor: Explicitly pass options we use while remounting root filesystemStefano Brivio2023-09-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | As a result of AppArmor commit d4b0fef10a4a ("parser: fix rule flag generation change_mount type rules"), we can't expect anymore to get permission to mount() / read-write, with MS_REC | MS_UNBINDABLE ("runbindable", in AppArmor terms), if we don't explicitly pass those flags as options. It used to work by mistake. Now, the reasonable expectation would be that we could just change the existing rule into: mount options=(rw, runbindable) "" -> /, ...but this now fails to load too, I think as a result of AppArmor commit 9d3f8c6cc05d ("parser: fix parsing of source as mount point for propagation type flags"). It works with 'rw' alone, but 'runbindable' is indeed a propagation type flag. Skip the source specification, it doesn't add anything meaningful to the rule anyway. Reported-by: Paul Holzinger <pholzing@redhat.com> Link: https://github.com/containers/podman/pull/19751 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* apparmor: Use abstractions/nameservice to deal with symlinked resolv.confStefano Brivio2023-09-061-2/+1
| | | | | | | | | | | | | While abstractions/nameservice appeared too broad and overkill for our simple need (read-only resolv.conf access), it properly deals with symlinked resolv.conf files generated by systemd-resolved, NetworkManager or suchlike. If we just grant read-only access to /etc/resolv.conf, we'll fail to read nameserver information in rather common configurations, because AppArmor won't follow the symlink. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt: Relicense to GPL 2.0, or any later versionStefano Brivio2023-04-063-3/+3
| | | | | | | | | | | | | | | | | | | In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* contrib/apparmor: Split profile into abstractions, use themStefano Brivio2023-02-273-60/+89
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One day, libvirt might actually support running passt to provide guest connectivity. Should libvirtd (or virtqemud) start passt, it will need to access socket and PID files in specific locations, and passt needs to accept SIGTERM in case QEMU fails to start after passt is already started. To make this more convenient, split the current profile into two abstractions, for passt and for pasta, so that external programmes can include the bits they need (and especially not include the pasta abstraction if they only need to start passt), plus whatever specific adaptation is needed. For stand-alone usage of passt and pasta, the 'passt' profile simply includes both abstractions, plus rules to create and access PID and capture files in default or reasonable ($HOME) locations. Tested on Debian with libvirt 9.0.0 together with a local fix to start passt as intended, namely libvirt commit c0efdbdb9f66 ("qemu_passt: Avoid double daemonizing passt"). This is an example of how the libvirtd profile (or virtqemud abstraction, or virtqemud profile) can use this: # support for passt network back-end /usr/bin/passt Cx -> passt, profile passt { /usr/bin/passt r, owner @{run}/user/[0-9]*/libvirt/qemu/run/passt/* rw, signal (receive) set=("term") peer=/usr/sbin/libvirtd, signal (receive) set=("term") peer=libvirtd, include if exists <abstractions/passt> } translated: - when executing /usr/bin/passt, switch to the subprofile "passt" (not the "discrete", i.e. stand-alone profile), described below. Scrub the environment (e.g. LD_PRELOAD is dropped) - in the "passt" subprofile: - allow reading the binary - allow read and write access to PID and socket files - make passt accept SIGTERM from /usr/sbin/libvirtd, and libvirtd peer names - include anything else that's needed by passt itself Suggested-by: Andrea Bolognani <abologna@redhat.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* contrib/apparmor: Merge pasta and passt profiles, update rulesStefano Brivio2022-11-162-88/+51
| | | | | | | | | | | | | AppArmor resolves executable links before profile attachment rules are evaluated, so, as long as pasta is installed as a link to passt, there's no way to differentiate the two cases. Merge the two profiles and leave a TODO note behind, explaining two possible ways forward. Update the rules so that passt and pasta are actually usable, once the profile is installed. Most required changes are related to isolation and sandboxing features. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt, pasta: Add examples of AppArmor policiesStefano Brivio2022-03-292-0/+125
These should cover any reasonably common use case in distributions. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>