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From e3f34eb2e0edc9cefe92e58e2ad4c98bcccf2090 Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Thu, 27 Aug 2015 10:33:15 +0200
Subject: [PATCH] selinux: fix check for transient units
SELinux does not have a path to check for a snapshot service creation.
This ends up giving us a bogus check.
On snapshot creation we should check if the remote process type, has the
ability to start a service with the type that systemd is running with.
Based on patch from Vaclav Pavlin and Dan Walsh
http://lists.freedesktop.org/archives/systemd-devel/2013-November/014021.html
RHEL only
Resolves: #1255129
---
src/core/dbus-manager.c | 4 ++--
src/core/selinux-access.c | 11 ++++++-----
src/core/selinux-access.h | 9 ++++++---
3 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index 2bc37ba60..1ec350e03 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -734,7 +734,7 @@ static int method_start_transient_unit(sd_bus *bus, sd_bus_message *message, voi
if (mode < 0)
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s is invalid.", smode);
- r = mac_selinux_access_check(message, "start", error);
+ r = mac_selinux_runtime_unit_access_check(message, "start", error);
if (r < 0)
return r;
@@ -1092,7 +1092,7 @@ static int method_create_snapshot(sd_bus *bus, sd_bus_message *message, void *us
assert(message);
assert(m);
- r = mac_selinux_access_check(message, "start", error);
+ r = mac_selinux_runtime_unit_access_check(message, "start", error);
if (r < 0)
return r;
diff --git a/src/core/selinux-access.c b/src/core/selinux-access.c
index ce4f39459..91460b8af 100644
--- a/src/core/selinux-access.c
+++ b/src/core/selinux-access.c
@@ -175,6 +175,7 @@ void mac_selinux_access_free(void) {
*/
int mac_selinux_generic_access_check(
sd_bus_message *message,
+ bool system,
const char *path,
const char *permission,
sd_bus_error *error) {
@@ -213,7 +214,9 @@ int mac_selinux_generic_access_check(
if (r < 0)
goto finish;
- if (path) {
+ tclass = "service";
+
+ if (path && !system) {
/* Get the file context of the unit file */
r = getfilecon(path, &fcon);
@@ -221,16 +224,14 @@ int mac_selinux_generic_access_check(
r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get file context on %s.", path);
goto finish;
}
-
- tclass = "service";
} else {
r = getcon(&fcon);
if (r < 0) {
r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get current context.");
goto finish;
}
-
- tclass = "system";
+ if (system)
+ tclass = "system";
}
sd_bus_creds_get_cmdline(creds, &cmdline);
diff --git a/src/core/selinux-access.h b/src/core/selinux-access.h
index dd1e8bb9d..7dc271b35 100644
--- a/src/core/selinux-access.h
+++ b/src/core/selinux-access.h
@@ -28,21 +28,24 @@
void mac_selinux_access_free(void);
-int mac_selinux_generic_access_check(sd_bus_message *message, const char *path, const char *permission, sd_bus_error *error);
+int mac_selinux_generic_access_check(sd_bus_message *message, bool system, const char *path, const char *permission, sd_bus_error *error);
int mac_selinux_unit_access_check_strv(char **units, sd_bus_message *message, Manager *m, const char *permission, sd_bus_error *error);
#ifdef HAVE_SELINUX
#define mac_selinux_access_check(message, permission, error) \
- mac_selinux_generic_access_check((message), NULL, (permission), (error))
+ mac_selinux_generic_access_check((message), true, NULL, (permission), (error))
#define mac_selinux_unit_access_check(unit, message, permission, error) \
({ \
Unit *_unit = (unit); \
- mac_selinux_generic_access_check((message), _unit->source_path ?: _unit->fragment_path, (permission), (error)); \
+ mac_selinux_generic_access_check((message), false, _unit->source_path ?: _unit->fragment_path, (permission), (error)); \
})
+#define mac_selinux_runtime_unit_access_check(message, permission, error) \
+ mac_selinux_generic_access_check((message), false, NULL, (permission), (error))
+
#else
#define mac_selinux_access_check(message, permission, error) 0