On Mon, Mar 31, 2025 at 07:30:02PM +0200, Alessandro wrote:
> We attempted multiple ways to clean up dynamic files; however, we must
> preserve user overrides, which requires keeping the file
> /etc/apparmor.d/libvirt/libvirt-uuid
>
> This commit proposes to move user overrides into
> /etc/apparmor.d/libvirt/libvirt-uuid.local and include it, if present,
> unconditionally. When we stop the domain, we remove libvirt.uuid and
> libvirt-uuid.files, whereas we preserve libvirt-uuid.local if present.
>
> Applying the patch, it produces the following:
>
> root@virt-hv-lab002:/etc/apparmor.d/libvirt# ls -1
> libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033*
> libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033
> libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033.files
> root@virt-hv-lab002:/etc/apparmor.d/libvirt# cat
> libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033
>
> profile libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033
> flags=(attach_disconnected) {
> #include <abstractions/libvirt-qemu>
> #include if exists
> <libvirt/libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033.files>
> #include if exists
> <libvirt/libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033.local>
>
> }
> root@virt-hv-lab002:/etc/apparmor.d/libvirt# cat
> libvirt-e7424556-ffc1-4f6e-bafa-84e66c4dc033.files
> "/var/log/libvirt/**/testing-9a4be628.log" w,
> "/var/lib/libvirt/qemu/domain-testing-9a4be628/monitor.sock" rw,
> "/var/lib/libvirt/qemu/domain-4-testing-9a4be628/*" rw,
> "/var/run/libvirt/**/testing-9a4be628.pid" rwk,
> "/var/run/libvirt/**/*.tunnelmigrate.dest.testing-9a4be628" rw,
> "/var/lib/libvirt/images/testing-9a4be628.qcow2" rwk,
> "/var/lib/libvirt/images/noble-server-cloudimg-amd64.img" rk,
> # don't audit writes to readonly files
> deny "/var/lib/libvirt/images/noble-server-cloudimg-amd64.img" w,
> "/var/lib/libvirt/images/testing-9a4be628-ds.qcow2" rwk,
> "/usr/share/OVMF/OVMF_CODE_4M.fd" rk,
> # don't audit writes to readonly files
> deny "/usr/share/OVMF/OVMF_CODE_4M.fd" w,
> "/var/lib/libvirt/qemu/nvram/testing-9a4be628_VARS.fd" rwk,
> "/dev/vhost-net" rw,
> "/var/lib/libvirt/qemu/domain-4-testing-9a4be628/{,**}" rwk,
> "/run/libvirt/qemu/channel/4-testing-9a4be628/{,**}" rwk,
> "/var/lib/libvirt/qemu/domain-4-testing-9a4be628/master-key.aes" rwk,
> "/dev/net/tun" rwk,
> "/dev/userfaultfd" rwk,
>
> Fixes: https://gitlab.com/libvirt/libvirt/-/issues/451
>
> Signed-off-by: Alessandro <[email protected]>
> ---
> src/security/virt-aa-helper.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c
> index 034c042..6a1fb85 100644
> --- a/src/security/virt-aa-helper.c
> +++ b/src/security/virt-aa-helper.c
> @@ -1495,8 +1495,10 @@ main(int argc, char **argv)
> rc = parserLoad(ctl->uuid);
> } else if (ctl->cmd == 'R' || ctl->cmd == 'D') {
> rc = parserRemove(ctl->uuid);
> - if (ctl->cmd == 'D')
> + if (ctl->cmd == 'D') {
> unlink(include_file);
> + unlink(profile);
> + }
> } else if (ctl->cmd == 'c' || ctl->cmd == 'r') {
> g_autofree char *included_files = NULL;
> g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
> @@ -1561,12 +1563,18 @@ main(int argc, char **argv)
> /* create the profile from TEMPLATE */
> if (ctl->cmd == 'c' || purged) {
> g_autofree char *tmp = NULL;
> + g_autofree char *tmp_local = NULL;
> + char *new_tmp = NULL;
> #if defined(WITH_APPARMOR_3)
> const char *ifexists = "if exists ";
> #else
> const char *ifexists = "";
> #endif
> tmp = g_strdup_printf(" #include %s<libvirt/%s.files>\n",
> ifexists, ctl->uuid);
> + tmp_local = g_strdup_printf(" #include %s<libvirt/%s.local>\n",
> ifexists, ctl->uuid);
> + new_tmp = g_strconcat(tmp, tmp_local, NULL);
> + g_free(tmp);
> + tmp = g_steal_pointer(&new_tmp);
While this works it is kinda convoluted. Instead of introducing a new
g_strdup_printf call just extend the current one
tmp = g_strdup_printf(" #include %s<libvirt/%s.files>\n" \
" #include %s<libvirt/%s.local>\n",
ifexists, ctl->uuid, ifexists, ctl->uuid);
With regards,
Daniel
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