[PATCH v2 3/4] apparmor: fix UUID specification

There is a common misconception when writing AppArmor policy that [0-9]* applies * to the [0-9] class, but that's not the case. For this example, [0-9]* matches a single digit followed by any number of characters except for / Create a UUID variable that uses the following format 8-4-4-4-12. Signed-off-by: Georgia Garcia <georgia.garcia(a)canonical.com&gt; --- src/security/apparmor/usr.lib.libvirt.virt-aa-helper.in | 5 ++++- src/security/apparmor/usr.sbin.libvirtd.in | 7 +++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/src/security/apparmor/usr.lib.libvirt.virt-aa-helper.in b/src/security/apparmor/usr.lib.libvirt.virt-aa-helper.in index 44645c6989..90a8b7072c 100644 --- a/src/security/apparmor/usr.lib.libvirt.virt-aa-helper.in +++ b/src/security/apparmor/usr.lib.libvirt.virt-aa-helper.in @@ -1,5 +1,8 @@ #include <tunables/global> +@{hextet}=[0-9a-f][0-9a-f][0-9a-f][0-9a-f] +@{UUID}=@{hextet}@{hextet}-@{hextet}-@{hextet}-@{hextet}-@{hextet}@{hextet}@{hextet} + profile virt-aa-helper @libexecdir@/virt-aa-helper { #include <abstractions/base> #include <abstractions/openssl> @@ -44,7 +47,7 @@ profile virt-aa-helper @libexecdir@/virt-aa-helper { /{usr/,}{s,}bin/apparmor_parser Ux, @sysconfdir(a)/apparmor.d/libvirt/* r, - @sysconfdir@/apparmor.d/libvirt/libvirt-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]* rw, + @sysconfdir@/apparmor.d/libvirt/libvirt-(a){UUID}* rw, # for backingstore -- allow access to non-hidden files in @{HOME} as well # as storage pools diff --git a/src/security/apparmor/usr.sbin.libvirtd.in b/src/security/apparmor/usr.sbin.libvirtd.in index 70e586895f..3659ddc219 100644 --- a/src/security/apparmor/usr.sbin.libvirtd.in +++ b/src/security/apparmor/usr.sbin.libvirtd.in @@ -1,4 +1,7 @@ #include <tunables/global> + +@{hextet}=[0-9a-f][0-9a-f][0-9a-f][0-9a-f] +@{UUID}=@{hextet}@{hextet}-@{hextet}-@{hextet}-@{hextet}-@{hextet}@{hextet}@{hextet} @{LIBVIRT}="libvirt" profile libvirtd @sbindir@/libvirtd flags=(attach_disconnected) { @@ -72,7 +75,7 @@ profile libvirtd @sbindir@/libvirtd flags=(attach_disconnected) { signal (send) set=("term") peer=libvirtd//qemu_bridge_helper, # allow connect with openGraphicsFD, direction reversed in newer versions - unix (send, receive) type=stream addr=none peer=(label=libvirt-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*), + unix (send, receive) type=stream addr=none peer=(label=libvirt-@{UUID}), # unconfined also required if guests run without security module unix (send, receive) type=stream addr=none peer=(label=unconfined), @@ -115,7 +118,7 @@ profile libvirtd @sbindir@/libvirtd flags=(attach_disconnected) { /etc/xen/scripts/** rmix, # allow changing to our UUID-based named profiles - change_profile -> @{LIBVIRT}-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*, + change_profile -> @{LIBVIRT}-@{UUID}, /usr/{lib,lib64,lib/qemu,libexec,libexec/qemu}/qemu-bridge-helper Cx -> qemu_bridge_helper, # child profile for bridge helper process -- 2.34.1