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From: "Sugar, David" <dsugar@tresys.com>
To: "selinux-refpolicy@vger.kernel.org"  <selinux-refpolicy@vger.kernel.org>
Subject: [PATCH 2/2] Setup private type for /etc/hostname.
Date: Fri, 11 Jan 2019 15:30:54 +0000	[thread overview]
Message-ID: <20190111153011.27275-5-dsugar@tresys.com> (raw)
In-Reply-To: <20190111153011.27275-1-dsugar@tresys.com>

hostnamectl updates /etc/hostname.
This change is setting up a private type for the file /etc/hostname (was etc_t)
and granting hostnamectl permission to edit this file.  Note that hostnamectl
is initially creating a new file .#hostname????? which is why the create
permissions are requied.

type=AVC msg=audit(1547039052.041:563): avc:  denied  { write } for  pid=7564 comm="systemd-hostnam" name="etc" dev="dm-1" ino=101 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=dir permissive=1
type=AVC msg=audit(1547039052.041:563): avc:  denied  { add_name } for  pid=7564 comm="systemd-hostnam" name=".#hostnamezyqZ9t" scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=dir permissive=1
type=AVC msg=audit(1547039052.041:563): avc:  denied  { create } for  pid=7564 comm="systemd-hostnam" name=".#hostnamezyqZ9t" scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1
type=AVC msg=audit(1547039052.041:563): avc:  denied  { write } for  pid=7564 comm="systemd-hostnam" path="/etc/.#hostnamezyqZ9t" dev="dm-1" ino=1094726 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1
type=SYSCALL msg=audit(1547039052.041:563): arch=c000003e syscall=2 success=yes exit=8 a0=560d0bba34b0 a1=800c2 a2=180 a3=5c35f14c items=2 ppid=1 pid=7564 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="systemd-hostnam" exe="/usr/lib/systemd/systemd-hostnamed" subj=system_u:system_r:systemd_hostnamed_t:s0 key=(null)
type=AVC msg=audit(1547039052.041:564): avc:  denied  { setattr } for  pid=7564 comm="systemd-hostnam" name=".#hostnamezyqZ9t" dev="dm-1" ino=1094726 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1
type=SYSCALL msg=audit(1547039052.041:564): arch=c000003e syscall=91 success=yes exit=0 a0=8 a1=1a4 a2=fbad2484 a3=24 items=1 ppid=1 pid=7564 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="systemd-hostnam" exe="/usr/lib/systemd/systemd-hostnamed" subj=system_u:system_r:systemd_hostnamed_t:s0 key=(null)
type=AVC msg=audit(1547039052.041:565): avc:  denied  { remove_name } for  pid=7564 comm="systemd-hostnam" name=".#hostnamezyqZ9t" dev="dm-1" ino=1094726 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=dir permissive=1
type=AVC msg=audit(1547039052.041:565): avc:  denied  { rename } for  pid=7564 comm="systemd-hostnam" name=".#hostnamezyqZ9t" dev="dm-1" ino=1094726 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1
type=AVC msg=audit(1547039052.041:565): avc:  denied  { unlink } for  pid=7564 comm="systemd-hostnam" name="hostname" dev="dm-1" ino=1094712 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1

Signed-off-by: Dave Sugar <dsugar@tresys.com>
---
 policy/modules/system/systemd.fc | 1 +
 policy/modules/system/systemd.te | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/policy/modules/system/systemd.fc b/policy/modules/system/systemd.fc
index eefcfaf1..2277fc1e 100644
--- a/policy/modules/system/systemd.fc
+++ b/policy/modules/system/systemd.fc
@@ -1,3 +1,4 @@
+/etc/hostname				--	gen_context(system_u:object_r:hostname_etc_t,s0)
 /etc/udev/hwdb\.bin			--	gen_context(system_u:object_r:systemd_hwdb_t,s0)
 
 /run/log/journal(/.*)?				gen_context(system_u:object_r:systemd_journal_t,s0)
diff --git a/policy/modules/system/systemd.te b/policy/modules/system/systemd.te
index f5f7dc1b..3704b756 100644
--- a/policy/modules/system/systemd.te
+++ b/policy/modules/system/systemd.te
@@ -77,6 +77,9 @@ type systemd_detect_virt_t;
 type systemd_detect_virt_exec_t;
 init_daemon_domain(systemd_detect_virt_t, systemd_detect_virt_exec_t)
 
+type hostname_etc_t;
+files_config_file(hostname_etc_t)
+
 type systemd_hostnamed_t;
 type systemd_hostnamed_exec_t;
 init_daemon_domain(systemd_hostnamed_t, systemd_hostnamed_exec_t)
@@ -317,10 +320,13 @@ seutil_search_default_contexts(systemd_coredump_t)
 # Hostnamed policy
 #
 
+allow systemd_hostnamed_t hostname_etc_t:file manage_file_perms;
+
 kernel_read_kernel_sysctls(systemd_hostnamed_t)
 
 dev_read_sysfs(systemd_hostnamed_t)
 
+files_etc_filetrans(systemd_hostnamed_t, hostname_etc_t, file)
 files_read_etc_files(systemd_hostnamed_t)
 
 seutil_read_file_contexts(systemd_hostnamed_t)
-- 
2.20.1


  parent reply	other threads:[~2019-01-11 15:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-11 15:30 [PATCH] Add interface to create unit files with specified type via filetrans Sugar, David
2019-01-11 15:30 ` [PATCH] Add interface to start/stop iptables service Sugar, David
2019-01-12 19:32   ` Chris PeBenito
2019-01-11 15:30 ` [PATCH] Alternate ClamAV temp directory Sugar, David
2019-01-12 19:34   ` Chris PeBenito
2019-01-15 21:31     ` Sugar, David
2019-01-11 15:30 ` [PATCH 1/2] Interface with systemd_hostnamed over dbus to set hostname Sugar, David
2019-01-11 15:30 ` Sugar, David [this message]
2019-01-12  1:11   ` [PATCH 2/2] Setup private type for /etc/hostname Russell Coker
2019-01-12  3:49     ` Sugar, David
2019-01-12 19:30 ` [PATCH] Add interface to create unit files with specified type via filetrans Chris PeBenito
2019-01-15 21:27   ` Sugar, David

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