From mboxrd@z Thu Jan 1 00:00:00 1970 From: Antoine Tenart Date: Fri, 31 Jul 2020 12:10:27 +0200 Subject: [Buildroot] [PATCH 02/15] fs/common.mk: set SELinux file security contexts In-Reply-To: <20200731101040.1723047-1-antoine.tenart@bootlin.com> References: <20200731101040.1723047-1-antoine.tenart@bootlin.com> Message-ID: <20200731101040.1723047-3-antoine.tenart@bootlin.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Set the SELinux file security contexts using setfiles when generating root filesystem images. Without such security contexts created at build time, they need to be setup at first boot by running the restorecon utility on the target. This has two drawbacks: - You have to special case the first boot, which cannot be done in enforcing mode, and will have to run restorecon, then reboot. - You cannot support read-only filesystems. By setting up the security contexts at build time, we can have a filesystem image that is immediately ready to boot an SELinux system in enforcing mode, including if the root filesystem is read-only. Signed-off-by: Antoine Tenart --- fs/common.mk | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/common.mk b/fs/common.mk index 842ea924a5e0..d915a8795b74 100644 --- a/fs/common.mk +++ b/fs/common.mk @@ -49,6 +49,16 @@ ROOTFS_COMMON_DEPENDENCIES = \ $(BR2_TAR_HOST_DEPENDENCY) \ $(if $(PACKAGES_USERS)$(ROOTFS_USERS_TABLES),host-mkpasswd) +ifeq ($(BR2_PACKAGE_REFPOLICY)$(BR2_PACKAGE_POLICYCOREUTILS),yy) +define ROOTFS_SELINUX + $(HOST_DIR)/sbin/setfiles -m -r $(TARGET_DIR) \ + -c $(TARGET_DIR)/etc/selinux/targeted/policy/policy.$(BR2_PACKAGE_LIBSEPOL_POLICY_VERSION) \ + $(TARGET_DIR)/etc/selinux/targeted/contexts/files/file_contexts \ + $(TARGET_DIR) +endef +ROOTFS_COMMON_DEPENDENCIES += refpolicy host-policycoreutils +endif + ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES = $(sort \ $(if $(filter undefined,$(origin ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES__X)), \ $(eval ROOTFS_COMMON_FINAL_RECURSIVE_DEPENDENCIES__X := \ @@ -172,6 +182,7 @@ $$(BINARIES_DIR)/$$(ROOTFS_$(2)_FINAL_IMAGE_NAME): $$(ROOTFS_$(2)_DEPENDENCIES) $$(foreach hook,$$(ROOTFS_$(2)_PRE_GEN_HOOKS),\ $$(call PRINTF,$$($$(hook))) >> $$(FAKEROOT_SCRIPT)$$(sep)) $$(call PRINTF,$$(ROOTFS_REPRODUCIBLE)) >> $$(FAKEROOT_SCRIPT) + $$(call PRINTF,$$(ROOTFS_SELINUX)) >> $$(FAKEROOT_SCRIPT) $$(call PRINTF,$$(ROOTFS_$(2)_CMD)) >> $$(FAKEROOT_SCRIPT) chmod a+x $$(FAKEROOT_SCRIPT) PATH=$$(BR_PATH) FAKEROOTDONTTRYCHOWN=1 $$(HOST_DIR)/bin/fakeroot -- $$(FAKEROOT_SCRIPT) -- 2.26.2