Add agl-selinux feature to enable SELinux support.
Notes:
- SELinux is in permissive mode by default for now, and using the
targeted policy by default.
- The linux-yocto specific bbappend in meta-selinux is masked out in
favor of adding a more universal kernel configuration fragment with
AGL's own scheme.
- SELinux specific recipes and bbappends are added via a meta-selinux
dynamic-layers addition in meta-agl-core to keep using meta-selinux
optional. This will avoid issues with the Yocto autobuilder testing
of meta-agl-core.
- To avoid the effectively hard-coded autorelabel on first boot, a
bbappend is added to the selinux-autorelabel recipe to remove the
flag creation. In the off chance that a build happens on a filesystem
without xattr support, the logic in the selinux-image bbclass will
still touch the /.autorelabel flag and trigger relabeling.
- A systemd unit and script are added with a new systemd-selinux-relabel
recipe to handle relabeling of some systemd generated files that do
not get handled during root filesystem construction. Some of these
can be addressed by some upstream tweaks, but /etc/machine-id will
always need special handling unless there is a shift to using
read-only or stateless root by default. With this workaround we still
avoid doing a full relabel and reboot on first boot, which helps
simplify CI.
Bug-AGL: SPEC-4332
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ibf469e11eb3a67709074cc6794b3d12cd5071a90
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27790
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
--- /dev/null
+DISTRO_FEATURES:append = " acl xattr selinux"
+
+# Reiterate the upstream default of targeted policy since that
+# is the mostly widely used model, and it will likely be easier
+# to pull policy from other distributions for it.
+# Having an explicit setting here seems useful for documentation
+# purposes, and it is still possible that using one of the other
+# refpolicy package options as the AGL default desirable, and it
+# would be set here.
+PREFERRED_PROVIDER_virtual/refpolicy ?= "refpolicy-targeted"
+
+# Default to permissive mode
+DEFAULT_ENFORCING ?= "permissive"
+
+# Override the base image class to get the SELinux labeling hook
+AGL_BASE_IMAGE ?= "selinux-image"
+
+# Mask out meta-selinux's linux-yocto kernel config bbappend to
+# avoid collision with AGL's own more universal scheme.
+BBMASK += "meta-selinux/recipes-kernel/linux/"
\ No newline at end of file
openembedded-layer:${LAYERDIR}/dynamic-layers/meta-oe/*/*/*.bb \
openembedded-layer:${LAYERDIR}/dynamic-layers/meta-oe/*/*/*.bbappend \
\
+ selinux:${LAYERDIR}/dynamic-layers/meta-selinux/*/*/*.bb \
+ selinux:${LAYERDIR}/dynamic-layers/meta-selinux/*/*/*.bbappend \
+ \
qt5-layer:${LAYERDIR}/dynamic-layers/meta-qt5/*/*/*.bb \
qt5-layer:${LAYERDIR}/dynamic-layers/meta-qt5/*/*/*.bbappend \
"
--- /dev/null
+[Unit]
+Description=Generated file SELinux relabeling
+DefaultDependencies=no
+After=local-fs.target systemd-machine-id-commit.service
+Before=sysinit.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/sbin/systemd-selinux-relabel.sh
+
+[Install]
+WantedBy=sysinit.target
--- /dev/null
+#!/bin/sh
+
+# Update labels on files generated on first boot.
+/usr/sbin/restorecon -FRi /etc/systemd /etc/machine-id
+if [ $? -eq 0 ]; then
+ # Disable parent service
+ # NOTE: The service does not use the first boot functionality
+ # in systemd as /etc/machine-id is not writeable until
+ # after it is complete.
+ systemctl disable systemd-selinux-relabel.service
+fi
+exit 0
--- /dev/null
+SUMMARY = "System unit to relabel systemd generated files"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+SRC_URI = "file://systemd-selinux-relabel.service \
+ file://systemd-selinux-relabel.sh \
+"
+
+inherit systemd allarch features_check
+
+SYSTEMD_SERVICE:${PN} = "${BPN}.service"
+
+REQUIRED_DISTRO_FEATURES = "systemd"
+
+do_configure[noexec] = "1"
+do_compile[noexec] = "1"
+
+do_install() {
+ install -d ${D}${systemd_system_unitdir}
+ install -m 0644 ${WORKDIR}/systemd-selinux-relabel.service ${D}${systemd_system_unitdir}/
+ install -d ${D}${sbindir}
+ install -m 0755 ${WORKDIR}/systemd-selinux-relabel.sh ${D}${sbindir}/
+}
+
+FILES:${PN} += "${systemd_system_unitdir}"
--- /dev/null
+SUMMARY = "SELinux packages"
+DESCRIPTION = "SELinux packages required for AGL"
+LICENSE = "MIT"
+
+inherit packagegroup features_check
+
+REQUIRED_DISTRO_FEATURES = "selinux"
+
+PACKAGES = " \
+ packagegroup-agl-core-selinux \
+ packagegroup-agl-core-selinux-devel \
+"
+
+#
+# meta-selinux's packagegroup-core-selinux includes a lot of
+# policy development tools with its inclusion of the layer's
+# packagegroup-selinux-policycoreutils, which is not really
+# desirable for a production image. Create our own base
+# packagegroup and an accompanying devel packagegroup that
+# agl-devel can trigger pulling in.
+#
+# NOTES:
+# - It seems likely we will always want auditd, so include
+# it in the base packagegroup.
+# - selinux-autorelabel seems required to handle both the
+# edge case of builds done on non-xattr capable filesystems,
+# and to allow driving relabeling after potential package
+# installation during runtime.
+# - packagegroup-selinux-policycoreutils includes a lot of
+# things that seem not useful in a lot of systems (e.g.
+# the gtk dependent selinux-gui), so for now the devel
+# packagegroup aims to include a more minimal set of tools
+# aimed at enabling checkpolicy and audit2allow use.
+# - Some thought needs to go into whether the relabeling
+# fixup packages should be handled separately, as they
+# ideally should not go into images using read-only or
+# stateless rootfs, but those are image features so we
+# cannot check for them here.
+#
+
+RDEPENDS:${PN} = " \
+ packagegroup-selinux-minimal \
+ auditd \
+ selinux-autorelabel \
+ systemd-selinux-relabel \
+"
+
+RDEPENDS:${PN}-devel = " \
+ ${BPN} \
+ libsepol-bin \
+ checkpolicy \
+ policycoreutils-loadpolicy \
+ policycoreutils-setsebool \
+ policycoreutils-hll \
+ semodule-utils-semodule-package \
+ selinux-python-audit2allow \
+"
--- /dev/null
+require ${@bb.utils.contains('AGL_FEATURES', 'aglcore', 'selinux-autorelabel_aglcore.inc', '', d)}
--- /dev/null
+do_install:append() {
+ # Do not force auto relabeling just from the package getting installed
+ rm -f ${D}/.autorelabel
+}
can-bus.cfg \
fanotify.cfg \
overlayfs.cfg \
+ ${@bb.utils.contains('DISTRO_FEATURES', 'selinux', 'selinux.cfg', '', d)} \
"
AGL_KCONFIG_FRAGMENTS += " ${@bb.utils.contains('AGL_XEN_GUEST_WANTED','1','xen_domu.cfg','',d)}"
--- /dev/null
+CONFIG_AUDIT=y
+CONFIG_AUDIT_GENERIC=y
+CONFIG_NETWORK_SECMARK=y
+CONFIG_EXT2_FS_SECURITY=y
+CONFIG_EXT3_FS_SECURITY=y
+CONFIG_EXT4_FS_SECURITY=y
+CONFIG_JFS_SECURITY=y
+CONFIG_REISERFS_FS_SECURITY=y
+CONFIG_JFFS2_FS_SECURITY=y
+CONFIG_SECURITY=y
+CONFIG_SECURITYFS=y
+CONFIG_SECURITY_NETWORK=y
+CONFIG_SECURITY_SELINUX=y
+CONFIG_SECURITY_SELINUX_BOOTPARAM=y
+CONFIG_SECURITY_SELINUX_DISABLE=y
+CONFIG_SECURITY_SELINUX_DEVELOP=y
+CONFIG_SECURITY_SELINUX_AVC_STATS=y
+CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE=1
IMAGE_LINGUAS = " "
-inherit core-image
+AGL_BASE_IMAGE ?= "core-image"
+
+inherit ${AGL_BASE_IMAGE}
+
+FEATURE_PACKAGES_selinux = " \
+ packagegroup-agl-core-selinux \
+ ${@bb.utils.contains('DISTRO_FEATURES', 'agl-devel', 'packagegroup-agl-core-selinux-devel', '', d)} \
+"
+
+IMAGE_FEATURES:append = " ${@bb.utils.filter('DISTRO_FEATURES', 'selinux', d)}"
IMAGE_INSTALL = "packagegroup-agl-core-boot ${CORE_IMAGE_EXTRA_INSTALL}"
--- /dev/null
+AGL_META_PYTHON = "${METADIR}/external/meta-openembedded/meta-python"
+
+BBLAYERS =+ " \
+ ${METADIR}/external/meta-selinux \
+ "
--- /dev/null
+#see meta-agl/meta-agl/conf/include/agl-selinux.inc
+require conf/include/agl-selinux.inc
--- /dev/null
+---
+description: Feature agl-selinux
+authors: Scott Murray <scott.murray@konsulko.com>
+---
+
+### Feature agl-selinux
+
+Enables building with SELinux enabled, with the default mode
+being permissive.
Code Review / AGL / meta-agl.git / commitdiff