rootlesskit: new policy module

Rootlesskit is required by rootless docker

Signed-off-by: Kenton Groombridge <me@concord.sh>

policy/modules/services/rootlesskit.fc

@@ -0,0 +1,3 @@
+/usr/bin/rootlesskit	--	gen_context(system_u:object_r:rootlesskit_exec_t,s0)
+/usr/bin/rootlessctl	--	gen_context(system_u:object_r:rootlesskit_exec_t,s0)
+/usr/bin/rootlesskit-docker-proxy	--	gen_context(system_u:object_r:rootlesskit_exec_t,s0)

policy/modules/services/rootlesskit.if

@@ -0,0 +1,106 @@
+## <summary>Policy for RootlessKit</summary>
+
+########################################
+## <summary>
+##	Execute rootlesskit in the caller domain.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed access.
+##	</summary>
+## </param>
+#
+interface(`rootlesskit_exec',`
+	gen_require(`
+		type rootlesskit_exec_t;
+	')
+
+	can_exec($1, rootlesskit_exec_t)
+')
+
+########################################
+## <summary>
+##	Execute rootlesskit in the rootlesskit domain.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed to transition.
+##	</summary>
+## </param>
+#
+interface(`rootlesskit_domtrans',`
+	gen_require(`
+		type rootlesskit_t, rootlesskit_exec_t;
+	')
+
+	corecmd_search_bin($1)
+	domtrans_pattern($1, rootlesskit_exec_t, rootlesskit_t)
+')
+
+########################################
+## <summary>
+##	Execute rootlesskit in the rootlesskit
+##	domain, and allow the specified role
+##	the rootlesskit domain.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed to transition.
+##	</summary>
+## </param>
+## <param name="role">
+##	<summary>
+##	The role to be allowed the rootlesskit domain.
+##	</summary>
+## </param>
+#
+interface(`rootlesskit_run',`
+	gen_require(`
+		type rootlesskit_t;
+	')
+
+	role $2 types rootlesskit_t;
+
+	rootlesskit_domtrans($1)
+')
+
+########################################
+## <summary>
+##	Role access for rootlesskit.
+## </summary>
+## <param name="role_prefix">
+##	<summary>
+##	The prefix of the user role (e.g., user
+##	is the prefix for user_r).
+##	</summary>
+## </param>
+## <param name="user_domain">
+##	<summary>
+##	User domain for the role.
+##	</summary>
+## </param>
+## <param name="user_exec_domain">
+##	<summary>
+##	User exec domain for execute and transition access.
+##	</summary>
+## </param>
+## <param name="role">
+##	<summary>
+##	Role allowed access.
+##	</summary>
+## </param>
+## <rolecap/>
+#
+template(`rootlesskit_role',`
+	gen_require(`
+		type rootlesskit_t;
+		type rootlesskit_exec_t;
+	')
+
+	rootlesskit_run($3, $4)
+
+	optional_policy(`
+		systemd_user_daemon_domain($1, rootlesskit_exec_t, rootlesskit_t)
+	')
+')
+

policy/modules/services/rootlesskit.te

@@ -0,0 +1,43 @@
+policy_module(rootlesskit)
+
+########################################
+#
+# Declarations
+#
+
+container_engine_domain_template(rootlesskit)
+type rootlesskit_exec_t;
+container_user_engine(rootlesskit_t)
+application_domain(rootlesskit_t, rootlesskit_exec_t)
+mls_trusted_object(rootlesskit_t)
+
+########################################
+#
+# Rootlesskit local policy
+#
+
+# rootlesskit fails without this access
+allow rootlesskit_t self:tun_socket { relabelfrom relabelto };
+
+can_exec(rootlesskit_t, rootlesskit_exec_t)
+
+domain_use_interactive_fds(rootlesskit_t)
+
+# any dir not readable or file not stat-able causes rootlesskit to hang
+# when --copy-up would access it; the below rules cover at least the
+# access needed for rootless docker (copying /etc and /run)
+files_list_all(rootlesskit_t)
+files_getattr_all_files(rootlesskit_t)
+files_getattr_all_pipes(rootlesskit_t)
+files_getattr_all_sockets(rootlesskit_t)
+
+kernel_read_sysctl(rootlesskit_t)
+
+auth_use_nsswitch(rootlesskit_t)
+
+userdom_exec_user_bin_files(rootlesskit_t)
+
+optional_policy(`
+	dbus_list_system_bus_runtime(rootlesskit_t)
+	dbus_system_bus_client(rootlesskit_t)
+')