extras/hook-scripts: SELinux brick file context management scripts

The SELinux policy for gluster defines the glusterd_brick_t type to
support server side SELinux (e.g., server side labels). Add
convenience hook scripts that users/packagers can install to ensure
that new bricks are labeled correctly.

The volume create hook script adds a new SELinux file context for
each brick path and runs a restorecon to label the brick. The
volume delete hook removes the per-brick SELinux file context.

Cherry picked from commit 859669759f7fa0f2114add13660ce3bf16c77f30:
> Change-Id: I5f102db5382d813c4d822ff74e873a7a669b41db
> BUG: 1047975
> Signed-off-by: Brian Foster <bfoster@redhat.com>
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Signed-off-by: Jiffin Tony Thottan <jthottan@redhat.com>
> Reviewed-on: https://review.gluster.org/6630
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

Change-Id: I5f102db5382d813c4d822ff74e873a7a669b41db
BUG: 1447597
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: https://review.gluster.org/17157
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>

3 files changed, 69 insertions, 0 deletions

diff --git a/extras/hook-scripts/delete/Makefile.am b/extras/hook-scripts/delete/Makefile.am
new file mode 100644
index 00000000000..c98a05d9205
--- /dev/null
+++ b/extras/hook-scripts/delete/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = pre
diff --git a/extras/hook-scripts/delete/pre/Makefile.am b/extras/hook-scripts/delete/pre/Makefile.am
new file mode 100644
index 00000000000..bf0eabe255c
--- /dev/null
+++ b/extras/hook-scripts/delete/pre/Makefile.am
@@ -0,0 +1,6 @@
+EXTRA_DIST = S10selinux-del-fcontext.sh
+
+scriptsdir = $(GLUSTERD_WORKDIR)/hooks/1/delete/pre/
+if USE_SELINUX
+scripts_SCRIPTS = S10selinux-del-fcontext.sh
+endif
diff --git a/extras/hook-scripts/delete/pre/S10selinux-del-fcontext.sh b/extras/hook-scripts/delete/pre/S10selinux-del-fcontext.sh
new file mode 100755
index 00000000000..2c83331d5cd
--- /dev/null
+++ b/extras/hook-scripts/delete/pre/S10selinux-del-fcontext.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+#
+# Install to hooks/<HOOKS_VER>/delete/pre
+#
+# Delete the file context associated with the brick path on volume deletion. The
+# associated file context was added during volume creation.
+#
+# We do not explicitly relabel the brick, as this could be time consuming and
+# unnecessary.
+#
+###
+
+PROGNAME="Sselinux"
+OPTSPEC="volname:"
+VOL=
+CONFIGFILE=
+LOGFILEBASE=
+PIDDIR=
+
+function parse_args () {
+        ARGS=$(getopt -l $OPTSPEC  -name $PROGNAME $@)
+        eval set -- "$ARGS"
+
+        while true; do
+        case $1 in
+        --volname)
+         shift
+         VOL=$1
+         ;;
+        *)
+         shift
+         break
+         ;;
+        esac
+        shift
+        done
+}
+
+function delete_brick_fcontext()
+{
+        volname=$1
+
+        # grab the path for each local brick
+        brickdirs=$(grep '^path=' /var/lib/glusterd/vols/${volname}/bricks/* | cut -d= -f 2)
+
+        for b in $brickdirs
+        do
+                # remove the file context associated with the brick path
+                semanage fcontext --delete $b\(/.*\)?
+        done
+}
+
+SELINUX_STATE=$(which getenforce && getenforce)
+[ "${SELINUX_STATE}" = 'Disabled' ] && exit 0
+
+parse_args $@
+[ -z "$VOL" ] && exit 1
+
+delete_brick_fcontext $VOL
+
+# failure to delete the fcontext is not fatal
+exit 0