[SELinux] Allow vnc session create ~/.vnc

Allow vnc session labeled with SELinux vnc_session_t domain to create
directory in user homedir ~/.vnc labeled with SELinux label xdm_home_t.

Because also process vncpasswd creates ~/.vnc directory, file transition that
userdomain attribute SELinux domain (label for the process) can create the
directory with the same label needs to be added.

userdomain attribute contains following SELinux types:
    auditadm_t
    dbadm_t
    guest_t
    logadm_t
    secadm_t
    staff_t
    staff_wine_t
    sysadm_t
    unconfined_t
    user_t
    user_wine_t
    webadm_t
    xguest_t

Signed-off-by: Lukas Vrabec <lvrabec@redhat.com>

unix/vncserver/selinux/vncsession.fc

@@ -17,6 +17,9 @@
 #  USA.
 #
 
+HOME_DIR/\.vnc(/.*)?      gen_context(system_u:object_r:xdm_home_t,s0)
+HOME_ROOT/\.vnc(/.*)?      gen_context(system_u:object_r:xdm_home_t,s0)
+
 /usr/sbin/vncsession			--	gen_context(system_u:object_r:vnc_session_exec_t,s0)
 /usr/libexec/vncsession-start		--	gen_context(system_u:object_r:vnc_session_exec_t,s0)
 

unix/vncserver/selinux/vncsession.te

@@ -19,6 +19,11 @@
 
 policy_module(vncsession, 1.0.0);
 
+gen_require(`
+    attribute userdomain;
+    type xdm_home_t;
+')
+
 type vnc_session_exec_t;
 corecmd_executable_file(vnc_session_exec_t)
 type vnc_session_t;
@@ -41,6 +46,16 @@ allow vnc_session_t self:capability { kill chown dac_override dac_read_search fo
 allow vnc_session_t self:process { getcap setsched setexec setrlimit };
 allow vnc_session_t self:fifo_file rw_fifo_file_perms;
 
+manage_files_pattern(vnc_session_t, xdm_home_t, xdm_home_t)
+manage_fifo_files_pattern(vnc_session_t, xdm_home_t, xdm_home_t)
+manage_sock_files_pattern(vnc_session_t, xdm_home_t, xdm_home_t)
+manage_lnk_files_pattern(vnc_session_t, xdm_home_t, xdm_home_t)
+userdom_user_home_dir_filetrans(vnc_session_t, xdm_home_t, dir, ".vnc")
+userdom_admin_home_dir_filetrans(vnc_session_t, xdm_home_t, dir, ".vnc")
+
+userdom_admin_home_dir_filetrans(userdomain, xdm_home_t, dir, ".vnc")
+userdom_user_home_dir_filetrans(userdomain, xdm_home_t, dir, ".vnc")
+
 miscfiles_read_localization(vnc_session_t)
 
 kernel_read_kernel_sysctls(vnc_session_t)
@@ -50,8 +65,3 @@ logging_append_all_logs(vnc_session_t)
 mcs_process_set_categories(vnc_session_t)
 mcs_killall(vnc_session_t)
 
-# To create the log file in the user home directory
-allow vnc_session_t file_type:dir search_dir_perms;
-userdom_user_home_dir_filetrans_user_home_content(vnc_session_t, dir, ".vnc");
-userdom_manage_user_home_content_dirs(vnc_session_t);
-userdom_manage_user_home_content_files(vnc_session_t);