install: with -Z, set default SELinux context for created directories

* doc/coreutils.texi (install invocation): Update -Z documentation.
* src/install.c (make_ancestor): Set default security context before
calling mkdir() if the -Z option is given.
(process_dir): Call restorecon() on the destination directory if the
-Z option is given.
(usage): Update -Z documentation.
* tests/install/install-Z-selinux.sh: A new test for 'install -Z -D'
and 'install -Z -d' based on tests/mkdir/restorecon.sh.
* tests/local.mk: Reference the test.
* NEWS: Mention the improvement.
Reported at https://bugzilla.redhat.com/1339135
Fixes http://bugs.gnu.org/23868

2 files changed, 59 insertions, 0 deletions

diff --git a/tests/install/install-Z-selinux.sh b/tests/install/install-Z-selinux.sh
new file mode 100755
index 000000000..9c3b6420b
--- /dev/null
+++ b/tests/install/install-Z-selinux.sh
@@ -0,0 +1,58 @@
+#!/bin/sh
+# test 'install -Z -D' and 'install -Z -d'
+# based on tests/mkdir/restorecon.sh
+
+# Copyright (C) 2013-2016 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ ginstall
+require_selinux_
+
+
+get_selinux_type() { ls -Zd "$1" | sed -n 's/.*:\(.*_t\):.*/\1/p'; }
+
+mkdir subdir || framework_failure_
+chcon 'root:object_r:tmp_t:s0' subdir || framework_failure_
+cd subdir
+
+# Since in a tmp_t dir, dirs can be created as user_tmp_t ...
+touch standard || framework_failure_
+mkdir restored || framework_failure_
+if restorecon restored 2>/dev/null; then
+  # ... but when restored can be set to user_home_t
+  # So ensure the type for these mkdir -Z cases matches
+  # the directory type as set by restorecon.
+  ginstall -Z standard single || fail=1
+  ginstall -Z -d single_d || fail=1
+  # Run these as separate processes in case global context
+  # set for an arg, impacts on another arg
+  # TODO: Have the defaultcon() vary over these directories
+  for dst in single_d/existing/file multi/ple/file; do
+    ginstall -Z -D standard "$dst" || fail=1
+  done
+  restored_type=$(get_selinux_type 'restored')
+  test "$(get_selinux_type 'single')" = "$restored_type" || fail=1
+  test "$(get_selinux_type 'single_d')" = "$restored_type" || fail=1
+  test "$(get_selinux_type 'single_d/existing')" = "$restored_type" || fail=1
+  test "$(get_selinux_type 'multi')" = "$restored_type" || fail=1
+  test "$(get_selinux_type 'multi/ple')" = "$restored_type" || fail=1
+fi
+if test "$fail" = '1'; then
+  ls -UZd standard restored
+  ls -UZd single single_d single_d/existing multi multi/ple
+fi
+
+Exit $fail
diff --git a/tests/local.mk b/tests/local.mk
index 3032bdafa..27cbf6e5d 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -550,6 +550,7 @@ all_tests =					\
   tests/install/d-slashdot.sh			\
   tests/install/install-C.sh			\
   tests/install/install-C-selinux.sh		\
+  tests/install/install-Z-selinux.sh		\
   tests/install/strip-program.sh		\
   tests/install/trap.sh				\
   tests/ln/backup-1.sh				\