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* [PATCH 1/2 v3] Allow greeter to start dbus
@ 2019-01-06 18:31 Sugar, David
  2019-01-06 18:31 ` [PATCH 2/2 v3] pam_faillock creates files in /run/faillock Sugar, David
  2019-01-06 18:57 ` [PATCH 1/2 v3] Allow greeter to start dbus Chris PeBenito
  0 siblings, 2 replies; 4+ messages in thread
From: Sugar, David @ 2019-01-06 18:31 UTC (permalink / raw)
  To: selinux-refpolicy

The display manager lightdm (and I think gdm) start a dbus binary.

v3 - Updated based on feedback

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

type=AVC msg=audit(1546551459.116:209): avc:  denied  { read } for pid=6275 comm="dbus-daemon" name="995" dev="tmpfs" ino=35210 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:systemd_logind_var_run_t:s0 tclass=file permissive=1
type=AVC msg=audit(1546551459.116:209): avc:  denied  { open } for pid=6275 comm="dbus-daemon" path="/run/systemd/users/995" dev="tmpfs" ino=35210 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:systemd_logind_var_run_t:s0 tclass=file permissive=1
type=AVC msg=audit(1546551459.116:210): avc:  denied  { getattr } for pid=6275 comm="dbus-daemon" path="/run/systemd/users/995" dev="tmpfs" ino=35210 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:systemd_logind_var_run_t:s0 tclass=file permissive=1

Signed-off-by: Dave Sugar <dsugar@tresys.com>
---
 policy/modules/services/dbus.if    | 19 +++++++++++++++++++
 policy/modules/services/xserver.te |  7 +++++++
 2 files changed, 26 insertions(+)

diff --git a/policy/modules/services/dbus.if b/policy/modules/services/dbus.if
index ef829e30..c815791e 100644
--- a/policy/modules/services/dbus.if
+++ b/policy/modules/services/dbus.if
@@ -17,6 +17,25 @@ 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)
+')
+
 ########################################
 ## <summary>
 ##	Role access for dbus.
diff --git a/policy/modules/services/xserver.te b/policy/modules/services/xserver.te
index fa7ce88e..c7714d3e 100644
--- a/policy/modules/services/xserver.te
+++ b/policy/modules/services/xserver.te
@@ -566,12 +566,19 @@ optional_policy(`
 ')
 
 optional_policy(`
+	allow xdm_t self:process getcap;
+
+	dbus_exec(xdm_t)
 	dbus_system_bus_client(xdm_t)
 	dbus_connect_system_bus(xdm_t)
 
 	optional_policy(`
 		accountsd_dbus_chat(xdm_t)
 	')
+
+	optional_policy(`
+		systemd_read_logind_pids(xdm_t)
+	')
 ')
 
 optional_policy(`
-- 
2.20.1


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2019-01-06 18:31 [PATCH 1/2 v3] Allow greeter to start dbus Sugar, David
2019-01-06 18:31 ` [PATCH 2/2 v3] pam_faillock creates files in /run/faillock Sugar, David
2019-01-06 18:57   ` Chris PeBenito
2019-01-06 18:57 ` [PATCH 1/2 v3] Allow greeter to start dbus Chris PeBenito

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