From a120ea8c25fc84dd41582431762e1c5770988f6c Mon Sep 17 00:00:00 2001
From: Dave Sugar <dsugar@tresys.com>
Date: Fri, 14 Jul 2023 13:41:07 -0400
Subject: [PATCH] Allow local login to read /run/motd
node=localhost type=AVC msg=audit(1689384764.155:53945): avc: denied { getattr } for pid=5125 comm="login" path="/run/motd" dev="tmpfs" ino=1574 scontext=system_u:system_r:local_login_t:s0 tcontext=system_u:object_r:pam_motd_runtime_t:s0 tclass=file permissive=1
node=localhost type=AVC msg=audit(1689384764.155:53946): avc: denied { read } for pid=5125 comm="login" name="motd" dev="tmpfs" ino=1574 scontext=system_u:system_r:local_login_t:s0 tcontext=system_u:object_r:pam_motd_runtime_t:s0 tclass=file permissive=1
node=localhost type=AVC msg=audit(1689384764.155:53946): avc: denied { open } for pid=5125 comm="login" path="/run/motd" dev="tmpfs" ino=1574 scontext=system_u:system_r:local_login_t:s0 tcontext=system_u:object_r:pam_motd_runtime_t:s0 tclass=file permissive=1
Signed-off-by: Dave Sugar <dsugar100@gmail.com>
---
policy/modules/system/authlogin.if | 19 +++++++++++++++++++
policy/modules/system/locallogin.te | 1 +
2 files changed, 20 insertions(+)
diff --git a/policy/modules/system/authlogin.if b/policy/modules/system/authlogin.if
index 4a2bfbccb..442a37b16 100644
--- a/policy/modules/system/authlogin.if
+++ b/policy/modules/system/authlogin.if
@@ -118,6 +118,25 @@ interface(`auth_use_pam_motd_dynamic',`
files_runtime_filetrans($1, pam_motd_runtime_t, file, "motd.dynamic.new")
')
+########################################
+## <summary>
+## Read the pam module motd with dynamic support during authentication.
+## </summary>
+## <param name="domain">
+## <summary>
+## Domain allowed access.
+## </summary>
+## </param>
+#
+interface(`auth_read_pam_motd_dynamic',`
+ gen_require(`
+ type pam_motd_runtime_t;
+ ')
+
+ files_search_runtime($1)
+ allow $1 pam_motd_runtime_t:file read_file_perms;
+')
+
########################################
## <summary>
## Make the specified domain used for a login program.
diff --git a/policy/modules/system/locallogin.te b/policy/modules/system/locallogin.te
index 7728de804..89311a323 100644
--- a/policy/modules/system/locallogin.te
+++ b/policy/modules/system/locallogin.te
@@ -128,6 +128,7 @@ auth_manage_pam_runtime_dirs(local_login_t)
auth_manage_pam_runtime_files(local_login_t)
auth_manage_pam_console_data(local_login_t)
auth_domtrans_pam_console(local_login_t)
+auth_read_pam_motd_dynamic(local_login_t)
init_dontaudit_use_fds(local_login_t)