[libvirt] [PATCH] virt-aa-helper: handle more disk images

[Cédric Bosdonnat]

virt-aa-helper needs read access to the disk image to resolve symlinks
and add the proper rules to the profile. Its profile whitelists a few
common paths, but users can place their images anywhere.

This commit helps users allowing access to their images by adding their
own rules in apparmor.d/local/usr.lib.libvirt.virt-aa-helper.

This commit also adds rules to allow reading files named:
  - *.raw as this is a rather common disk image extension
  - /run/libvirt/**[vd]d[a-z] as these are used by virt-sandbox
---
 examples/Makefile.am                             | 24 ++++++++++++++++++++++--
 examples/apparmor/usr.lib.libvirt.virt-aa-helper |  4 ++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/examples/Makefile.am b/examples/Makefile.am
index ef2f79db3..8a1d6919a 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -67,6 +67,9 @@ admin_client_info_SOURCES = admin/client_info.c
 admin_client_close_SOURCES = admin/client_close.c
 admin_logging_SOURCES = admin/logging.c
 
+INSTALL_DATA_LOCAL =
+UNINSTALL_LOCAL =
+
 if WITH_APPARMOR_PROFILES
 apparmordir = $(sysconfdir)/apparmor.d/
 apparmor_DATA = \
@@ -85,20 +88,37 @@ templates_DATA = \
 	apparmor/TEMPLATE.qemu \
 	apparmor/TEMPLATE.lxc \
 	$(NULL)
+
+APPARMOR_LOCAL_DIR = "$(DESTDIR)$(apparmordir)/local"
+install-apparmor-local:
+	$(MKDIR_P) "$(APPARMOR_LOCAL_DIR)"
+	echo "# Site-specific additions and overrides for \
+  		 'usr.lib.libvirt.virt-aa-helper'" \
+		 >$(APPARMOR_LOCAL_DIR)/usr.lib.libvirt.virt-aa-helper
+
+INSTALL_DATA_LOCAL += install-apparmor-local
+UNINSTALL_LOCAL += uninstall-apparmor-local
 endif WITH_APPARMOR_PROFILES
 
 if WITH_NWFILTER
 NWFILTER_DIR = "$(DESTDIR)$(sysconfdir)/libvirt/nwfilter"
 
-install-data-local:
+install-nwfilter-local:
 	$(MKDIR_P) "$(NWFILTER_DIR)"
 	for f in $(FILTERS); do \
 		$(INSTALL_DATA) $$f "$(NWFILTER_DIR)"; \
 	done
 
-uninstall-local::
+uninstall-nwfilter-local::
 	for f in $(FILTERS); do \
 		rm -f "$(NWFILTER_DIR)/`basename $$f`"; \
 	done
 	-test -z "$(shell ls $(NWFILTER_DIR))" || rmdir $(NWFILTER_DIR)
+
+INSTALL_DATA_LOCAL += install-nwfilter-local
+UNINSTALL_LOCAL += uninstall-nwfilter-local
 endif WITH_NWFILTER
+
+install-data-local: $(INSTALL_DATA_LOCAL)
+
+uninstall-local: $(UNINSTALL_LOCAL)
diff --git a/examples/apparmor/usr.lib.libvirt.virt-aa-helper b/examples/apparmor/usr.lib.libvirt.virt-aa-helper
index bd6181d00..f3069d369 100644
--- a/examples/apparmor/usr.lib.libvirt.virt-aa-helper
+++ b/examples/apparmor/usr.lib.libvirt.virt-aa-helper
@@ -3,6 +3,7 @@
 
 profile virt-aa-helper /usr/{lib,lib64}/libvirt/virt-aa-helper {
   #include <abstractions/base>
+  #include <local/usr.lib.libvirt.virt-aa-helper>
 
   # needed for searching directories
   capability dac_override,
@@ -50,8 +51,11 @@ profile virt-aa-helper /usr/{lib,lib64}/libvirt/virt-aa-helper {
   /var/lib/libvirt/images/ r,
   /var/lib/libvirt/images/** r,
   /{media,mnt,opt,srv}/** r,
+  # For virt-sandbox
+  /run/libvirt/**/[sv]d[a-z] r
 
   /**.img r,
+  /**.raw r,
   /**.qcow{,2} r,
   /**.qed r,
   /**.vmdk r,
-- 
2.15.1