The display manager lightdm (and I think gdm) start a dbus binary.
This adds (and uses) new interface dbus_exec to start dbus in the xdm domain.
type=AVC msg=audit(1544626796.378:201): avc: denied { execute } for pid=9973 comm="dbus-launch" name="dbus-daemon" dev="dm-1" ino=6695040 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dbusd_exec_t:s0 tclass=file permissive=1
type=AVC msg=audit(1544626796.378:201): avc: denied { read open } for pid=9973 comm="dbus-launch" path="/usr/bin/dbus-daemon" dev="dm-1" ino=6695040 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dbusd_exec_t:s0 tclass=file permissive=1
type=AVC msg=audit(1544626796.378:201): avc: denied { execute_no_trans } for pid=9973 comm="dbus-launch" path="/usr/bin/dbus-daemon" dev="dm-1" ino=6695040 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dbusd_exec_t:s0 tclass=file permissive=1
type=AVC msg=audit(1544626796.378:201): avc: denied { map } for pid=9973 comm="dbus-daemon" path="/usr/bin/dbus-daemon" dev="dm-1" ino=6695040 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dbusd_exec_t:s0 tclass=file permissive=1
type=AVC msg=audit(1546551459.112:208): avc: denied { getcap } for pid=6275 comm="dbus-daemon" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=process permissive=1
Signed-off-by: Dave Sugar <dsugar@xxxxxxxxxx>
---
policy/modules/services/dbus.if | 21 +++++++++++++++++++++
policy/modules/services/xserver.te | 1 +
2 files changed, 22 insertions(+)
diff --git a/policy/modules/services/dbus.if b/policy/modules/services/dbus.if
index ef829e30..d0eec745 100644
--- a/policy/modules/services/dbus.if
+++ b/policy/modules/services/dbus.if
@@ -17,6 +17,27 @@ interface(`dbus_stub',`
')
')
+########################################
+## <summary>
+## Execute dbus in the caller domain.
+## </summary>
+## <param name="domain">
+## <summary>
+## Domain allowed access.
+## </summary>
+## </param>
+#
+interface(`dbus_exec',`
+ gen_require(`
+ type dbusd_exec_t;
+ ')
+
+ corecmd_search_bin($1)
+ can_exec($1, dbusd_exec_t)
+
+ allow $1 self:process getcap;
+')
+
########################################
## <summary>
## Role access for dbus.
diff --git a/policy/modules/services/xserver.te b/policy/modules/services/xserver.te
index fa7ce88e..cc717e7f 100644
--- a/policy/modules/services/xserver.te
+++ b/policy/modules/services/xserver.te
@@ -566,6 +566,7 @@ optional_policy(`
')
optional_policy(`
+ dbus_exec(xdm_t)
dbus_system_bus_client(xdm_t)
dbus_connect_system_bus(xdm_t)
--
2.20.1
