diff -up shadow-4.12.3/src/useradd.c.redhat shadow-4.12.3/src/useradd.c
--- shadow-4.12.3/src/useradd.c.redhat	2022-08-06 18:22:45.000000000 +0200
+++ shadow-4.12.3/src/useradd.c	2022-08-22 15:57:19.034664441 +0200
@@ -82,7 +82,7 @@ const char *Prog;
 static gid_t def_group = 1000;
 static const char *def_gname = "other";
 static const char *def_home = "/home";
-static const char *def_shell = "/bin/bash";
+static const char *def_shell = "/sbin/nologin";
 static const char *def_template = SKEL_DIR;
 static const char *def_create_mail_spool = "yes";
 static const char *def_log_init = "yes";
@@ -93,7 +93,7 @@ static const char *def_expire = "";
 #define	VALID(s)	(strcspn (s, ":\n") == strlen (s))
 
 static const char *user_name = "";
-static const char *user_pass = "!";
+static const char *user_pass = "!!";
 static uid_t user_id;
 static gid_t user_gid;
 static const char *user_comment = "";
@@ -1227,7 +1227,7 @@ static void process_flags (int argc, cha
 			{NULL, 0, NULL, '\0'}
 		};
 		while ((c = getopt_long (argc, argv,
-					 "b:c:d:De:f:g:G:hk:K:lmMNop:rR:P:s:u:U"
+					 "b:c:d:De:f:g:G:hk:K:lmMnNop:rR:P:s:u:U"
 #ifdef WITH_SELINUX
 		                         "Z:"
 #endif				/* WITH_SELINUX */
@@ -1395,6 +1395,7 @@ static void process_flags (int argc, cha
 			case 'M':
 				Mflg = true;
 				break;
+			case 'n':
 			case 'N':
 				Nflg = true;
 				break;