[PATCH v4] Add knot module

[Alexander Miroshnichenko <alex@millerson.name>]

Add a SELinux Reference Policy module for the
Knot authoritative-only DNS server.

Signed-off-by: Alexander Miroshnichenko <alex@millerson.name>
---
 policy/modules/roles/sysadm.te  |   5 ++
 policy/modules/services/knot.fc |  11 +++
 policy/modules/services/knot.if | 108 ++++++++++++++++++++++++++++
 policy/modules/services/knot.te | 121 ++++++++++++++++++++++++++++++++
 policy/modules/system/init.te   |   4 ++
 5 files changed, 249 insertions(+)
 create mode 100644 policy/modules/services/knot.fc
 create mode 100644 policy/modules/services/knot.if
 create mode 100644 policy/modules/services/knot.te

diff --git a/policy/modules/roles/sysadm.te b/policy/modules/roles/sysadm.te
index 8f891c83865f..1f986432e2af 100644
--- a/policy/modules/roles/sysadm.te
+++ b/policy/modules/roles/sysadm.te
@@ -550,6 +550,11 @@ optional_policy(`
 	keystone_admin(sysadm_t, sysadm_r)
 ')
 
+optional_policy(`
+	knot_admin(sysadm_t, sysadm_r)
+	knot_run_client(sysadm_t, sysadm_r)
+')
+
 optional_policy(`
 	kismet_admin(sysadm_t, sysadm_r)
 ')
diff --git a/policy/modules/services/knot.fc b/policy/modules/services/knot.fc
new file mode 100644
index 000000000000..bbf8a3526aeb
--- /dev/null
+++ b/policy/modules/services/knot.fc
@@ -0,0 +1,11 @@
+/etc/rc\.d/init\.d/knot	--	gen_context(system_u:object_r:knot_initrc_exec_t,s0)
+
+/etc/knot(/.*)?		gen_context(system_u:object_r:knot_conf_t,s0)
+
+/usr/sbin/knotd		--	gen_context(system_u:object_r:knotd_exec_t,s0)
+
+/usr/sbin/knotc		--      gen_context(system_u:object_r:knotc_exec_t,s0)
+
+/var/lib/knot(/.*)?	gen_context(system_u:object_r:knot_var_lib_t,s0)
+
+/run/knot(/.*)?		gen_context(system_u:object_r:knot_runtime_t,s0)
diff --git a/policy/modules/services/knot.if b/policy/modules/services/knot.if
new file mode 100644
index 000000000000..a3792c3d15d0
--- /dev/null
+++ b/policy/modules/services/knot.if
@@ -0,0 +1,108 @@
+## <summary>high-performance authoritative-only DNS server.</summary>
+
+########################################
+## <summary>
+##      Execute knotc in the knotc domain.
+## </summary>
+## <param name="domain">
+## <summary>
+##      Domain allowed to transition.
+## </summary>
+## </param>
+#
+interface(`knot_domtrans_client',`
+	gen_require(`
+		type knotc_t, knotc_exec_t;
+	')
+
+	corecmd_search_bin($1)
+	domtrans_pattern($1, knotc_exec_t, knotc_t)
+')
+
+########################################
+## <summary>
+##      Execute knotc in the knotc domain, and
+##      allow the specified role the knotc domain.
+## </summary>
+## <param name="domain">
+##      <summary>
+##      Domain allowed to transition.
+##      </summary>
+## </param>
+## <param name="role">
+##      <summary>
+##      Role allowed access.
+##      </summary>
+## </param>
+## <rolecap/>
+#
+interface(`knot_run_client',`
+	gen_require(`
+		attribute_role knot_roles;
+	')
+
+	knot_domtrans_client($1)
+	roleattribute $2 knot_roles;
+')
+
+########################################
+## <summary>
+##      Read knot config files.
+## </summary>
+## <param name="domain">
+##      <summary>
+##      Domain allowed access.
+##      </summary>
+## </param>
+#
+interface(`knot_read_config_files',`
+	gen_require(`
+		type knot_conf_t;
+	')
+
+	read_files_pattern($1, knot_conf_t, knot_conf_t)
+	files_search_etc($1)
+')
+
+########################################
+## <summary>
+##      All of the rules required to
+##      administrate an knot environment.
+## </summary>
+## <param name="domain">
+##      <summary>
+##      Domain allowed access.
+##      </summary>
+## </param>
+## <param name="role">
+##      <summary>
+##      Role allowed access.
+##      </summary>
+## </param>
+## <rolecap/>
+#
+interface(`knot_admin',`
+	gen_require(`
+		type knotc_t, knotd_t, knot_conf_t, knot_initrc_exec_t;
+		type knot_runtime_t, knot_tmp_t, knot_var_lib_t;
+	')
+
+	allow $1 knotc_t:process signal_perms;
+	allow $1 knotd_t:process { ptrace signal_perms };
+	ps_process_pattern($1, knotc_t)
+	ps_process_pattern($1, knotd_t)
+
+	init_startstop_service($1, $2, knotd_t, knot_initrc_exec_t)
+
+	files_search_etc($1)
+	admin_pattern($1, knot_conf_t)
+
+	files_search_pids($1)
+	admin_pattern($1, knot_runtime_t)
+
+	files_search_tmp($1)
+	admin_pattern($1, knot_tmp_t)
+
+	files_search_var_lib($1)
+	admin_pattern($1, knot_var_lib_t)
+')
diff --git a/policy/modules/services/knot.te b/policy/modules/services/knot.te
new file mode 100644
index 000000000000..04a9aff00be6
--- /dev/null
+++ b/policy/modules/services/knot.te
@@ -0,0 +1,121 @@
+policy_module(knot, 1.0.0)
+
+########################################
+#
+# Declarations
+#
+
+attribute_role knot_roles;
+
+type knotd_t;
+type knotd_exec_t;
+init_daemon_domain(knotd_t, knotd_exec_t)
+
+type knotc_t;
+type knotc_exec_t;
+application_domain(knotc_t, knotc_exec_t)
+init_system_domain(knotc_t, knotc_exec_t)
+role knot_roles types knotc_t;
+
+type knot_conf_t;
+files_config_file(knot_conf_t)
+
+type knot_initrc_exec_t;
+init_script_file(knot_initrc_exec_t)
+
+type knot_runtime_t;
+files_pid_file(knot_runtime_t)
+
+type knot_var_lib_t;
+files_type(knot_var_lib_t)
+
+type knot_tmp_t;
+files_tmp_file(knot_tmp_t)
+
+########################################
+#
+# knotd local policy
+#
+allow knotd_t self:capability { dac_override dac_read_search setgid setpcap setuid };
+allow knotd_t self:process { signal_perms getcap getsched setsched };
+allow knotd_t self:tcp_socket create_stream_socket_perms;
+allow knotd_t self:udp_socket create_socket_perms;
+allow knotd_t self:unix_stream_socket create_stream_socket_perms;
+
+corenet_tcp_bind_generic_node(knotd_t)
+corenet_udp_bind_generic_node(knotd_t)
+
+corenet_sendrecv_dns_server_packets(knotd_t)
+corenet_tcp_bind_dns_port(knotd_t)
+corenet_udp_bind_dns_port(knotd_t)
+# Slave replication
+corenet_tcp_connect_dns_port(knotd_t)
+
+kernel_read_kernel_sysctls(knotd_t)
+
+allow knotd_t knot_conf_t:file map;
+knot_read_config_files(knotd_t)
+
+manage_dirs_pattern(knotd_t, knot_runtime_t, knot_runtime_t)
+manage_files_pattern(knotd_t, knot_runtime_t, knot_runtime_t)
+manage_lnk_files_pattern(knotd_t, knot_runtime_t, knot_runtime_t)
+manage_sock_files_pattern(knotd_t, knot_runtime_t, knot_runtime_t)
+files_pid_filetrans(knotd_t, knot_runtime_t, dir)
+
+allow knotd_t knot_tmp_t:file map;
+allow knotd_t knot_tmp_t:file manage_file_perms;
+allow knotd_t knot_tmp_t:dir manage_dir_perms;
+files_tmp_filetrans(knotd_t, knot_tmp_t, { file dir })
+
+allow knotd_t knot_var_lib_t:file map;
+manage_dirs_pattern(knotd_t, knot_var_lib_t, knot_var_lib_t)
+manage_files_pattern(knotd_t, knot_var_lib_t, knot_var_lib_t)
+manage_lnk_files_pattern(knotd_t, knot_var_lib_t, knot_var_lib_t)
+files_var_lib_filetrans(knotd_t, knot_var_lib_t, dir)
+
+files_map_etc_files(knotd_t)
+files_search_var_lib(knotd_t)
+
+fs_getattr_xattr_fs(knotd_t)
+
+fs_getattr_tmpfs(knotd_t)
+
+auth_use_nsswitch(knotd_t)
+
+logging_send_syslog_msg(knotd_t)
+
+miscfiles_read_localization(knotd_t)
+
+########################################
+#
+# knotc local policy
+#
+allow knotc_t self:capability { dac_override dac_read_search };
+allow knotc_t self:process signal;
+
+stream_connect_pattern(knotc_t, knot_runtime_t, knot_runtime_t, knotd_t)
+
+allow knotc_t knot_conf_t:file map;
+knot_read_config_files(knotc_t)
+
+allow knotc_t knot_tmp_t:file map;
+allow knotc_t knot_tmp_t:file manage_file_perms;
+allow knotc_t knot_tmp_t:dir manage_dir_perms;
+files_tmp_filetrans(knotc_t, knot_tmp_t, { file dir })
+
+allow knotc_t knot_var_lib_t:file map;
+manage_dirs_pattern(knotc_t, knot_var_lib_t, knot_var_lib_t)
+manage_files_pattern(knotc_t, knot_var_lib_t, knot_var_lib_t)
+manage_lnk_files_pattern(knotc_t, knot_var_lib_t, knot_var_lib_t)
+
+files_read_etc_files(knotc_t)
+files_search_pids(knotc_t)
+files_search_var_lib(knotc_t)
+
+fs_getattr_tmpfs(knotc_t)
+
+domain_use_interactive_fds(knotc_t)
+
+miscfiles_read_localization(knotc_t)
+
+userdom_use_user_ptys(knotc_t)
diff --git a/policy/modules/system/init.te b/policy/modules/system/init.te
index f4d27bff3ea2..d118290e6c19 100644
--- a/policy/modules/system/init.te
+++ b/policy/modules/system/init.te
@@ -1158,6 +1158,10 @@ optional_policy(`
 	kerberos_use(initrc_t)
 ')
 
+optional_policy(`
+	knot_read_config_files(initrc_t)
+')
+
 optional_policy(`
 	ldap_read_config(initrc_t)
 	ldap_list_db(initrc_t)
-- 
2.21.0