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>

9 files changed, 166 insertions, 4 deletions

diff --git a/configure.ac b/configure.ac
index 9f04bad1df7..fde410326de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -223,6 +223,10 @@ AC_CONFIG_FILES([Makefile
                 extras/hook-scripts/add-brick/Makefile
                 extras/hook-scripts/add-brick/pre/Makefile
                 extras/hook-scripts/add-brick/post/Makefile
+                extras/hook-scripts/create/Makefile
+                extras/hook-scripts/create/post/Makefile
+                extras/hook-scripts/delete/Makefile
+                extras/hook-scripts/delete/pre/Makefile
                 extras/hook-scripts/start/Makefile
                 extras/hook-scripts/start/post/Makefile
                 extras/hook-scripts/set/Makefile
@@ -895,6 +899,21 @@ else
 fi
 # end of xml-output
 
+dnl SELinux feature enablement
+case $host_os in
+  linux*)
+    AC_ARG_ENABLE([selinux],
+                  AC_HELP_STRING([--disable-selinux],
+                                 [Disable SELinux features]),
+                  [USE_SELINUX="${enableval}"], [USE_SELINUX="yes"])
+    ;;
+  *)
+    USE_SELINUX=no
+    ;;
+esac
+AM_CONDITIONAL(USE_SELINUX, test "x${USE_SELINUX}" = "xyes")
+dnl end of SELinux feature enablement
+
 AC_CHECK_HEADERS([execinfo.h], [have_backtrace=yes])
 if test "x${have_backtrace}" = "xyes"; then
    AC_DEFINE(HAVE_BACKTRACE, 1, [define if found backtrace])
@@ -1557,6 +1576,7 @@ echo "Unit Tests           : $BUILD_UNITTEST"
 echo "Track priv ports     : $TRACK_PRIVPORTS"
 echo "POSIX ACLs           : $BUILD_POSIX_ACLS"
 echo "Data Classification  : $BUILD_GFDB"
+echo "SELinux features     : $USE_SELINUX"
 echo "firewalld-config     : $BUILD_FIREWALLD"
 echo "Events               : $BUILD_EVENTS"
 echo "EC dynamic support   : $EC_DYNAMIC_SUPPORT"
diff --git a/extras/hook-scripts/Makefile.am b/extras/hook-scripts/Makefile.am
index 771b37e3fdf..26059d7dbb9 100644
--- a/extras/hook-scripts/Makefile.am
+++ b/extras/hook-scripts/Makefile.am
@@ -1,5 +1,5 @@
 EXTRA_DIST = S40ufo-stop.py S56glusterd-geo-rep-create-post.sh
-SUBDIRS = add-brick set start stop reset
+SUBDIRS = add-brick create delete set start stop reset
 
 scriptsdir = $(GLUSTERD_WORKDIR)/hooks/1/gsync-create/post/
 if USE_GEOREP
diff --git a/extras/hook-scripts/create/Makefile.am b/extras/hook-scripts/create/Makefile.am
new file mode 100644
index 00000000000..b083a9145d6
--- /dev/null
+++ b/extras/hook-scripts/create/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = post
diff --git a/extras/hook-scripts/create/post/Makefile.am b/extras/hook-scripts/create/post/Makefile.am
new file mode 100644
index 00000000000..adbce78d249
--- /dev/null
+++ b/extras/hook-scripts/create/post/Makefile.am
@@ -0,0 +1,6 @@
+EXTRA_DIST = S10selinux-label-brick.sh
+
+scriptsdir = $(GLUSTERD_WORKDIR)/hooks/1/create/post/
+if USE_SELINUX
+scripts_SCRIPTS = S10selinux-label-brick.sh
+endif
diff --git a/extras/hook-scripts/create/post/S10selinux-label-brick.sh b/extras/hook-scripts/create/post/S10selinux-label-brick.sh
new file mode 100755
index 00000000000..d69a938123e
--- /dev/null
+++ b/extras/hook-scripts/create/post/S10selinux-label-brick.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# Install to hooks/<HOOKS_VER>/create/post
+#
+# Add an SELinux file context for each brick using the glusterd_brick_t type.
+# This ensures that the brick is relabeled correctly on an SELinux restart or
+# restore. Subsequently, run a restore on the brick path to set the selinux
+# labels.
+#
+###
+
+PROGNAME="Sselinux"
+OPTSPEC="volname:"
+VOL=
+
+function parse_args () {
+        ARGS=$(getopt -l $OPTSPEC  -name $PROGNAME $@)
+        eval set -- "$ARGS"
+
+        while true; do
+        case $1 in
+        --volname)
+         shift
+         VOL=$1
+         ;;
+        *)
+         shift
+         break
+         ;;
+        esac
+        shift
+        done
+}
+
+function set_brick_labels()
+{
+        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
+                # Add a file context for each brick path and associate with the
+                # glusterd_brick_t SELinux type.
+                semanage fcontext --add -t glusterd_brick_t -r s0 $b(/.*)?
+
+                # Set the labels on the new brick path.
+                restorecon -R $b
+        done
+}
+
+SELINUX_STATE=$(which getenforce && getenforce)
+[ "${SELINUX_STATE}" = 'Disabled' ] && exit 0
+
+parse_args $@
+[ -z "$VOL" ] && exit 1
+
+set_brick_labels $VOL
+
+exit 0
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
diff --git a/glusterfs.spec.in b/glusterfs.spec.in
index 6ae3979757a..742c43bf0ce 100644
--- a/glusterfs.spec.in
+++ b/glusterfs.spec.in
@@ -1227,8 +1227,9 @@ exit 0
             %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/add-brick/post/disabled-quota-root-xattr-heal.sh
             %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/add-brick/pre/S28Quota-enable-root-xattr-heal.sh
        %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/add-brick/pre
-%ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create
-%ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create/post
+       %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create
+       %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create/post
+            %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create/post/S10selinux-label-brick.sh
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/create/pre
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/copy-file
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/copy-file/post
@@ -1236,7 +1237,8 @@ exit 0
        %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/delete
        %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/delete/post
                             %{_sharedstatedir}/glusterd/hooks/1/delete/post/S57glusterfind-delete-post
-%ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/delete/pre
+       %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/delete/pre
+            %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/delete/pre/S10selinux-del-fcontext.sh
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/remove-brick
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/remove-brick/post
 %ghost %dir %attr(0755,-,-) %{_sharedstatedir}/glusterd/hooks/1/remove-brick/pre
@@ -1303,6 +1305,9 @@ exit 0
 - /var/run/gluster owner gluster:gluster(0775) for qemu(gfapi)
   statedumps (#1445569)
 
+* Mon Apr 24 2017 Jiffin Tony Thottan <jhottan@redhat.com>
+- Install SELinux hook scripts that manage contexts for bricks (#1047975)
+
 * Thu Apr 20 2017 Kaleb S. KEITHLEY <kkeithle@redhat.com>
 - firewalld-filesystem -> firewalld (#1443959)