Goal: Do not hardcode pam_fail_delay and let pam_unix do its
      job to set a delay...or not

Fixes: #87648

Status wrt upstream: Forwarded but not applied yet

Note: If removed, FAIL_DELAY must be re-added to /etc/login.defs

Index: shadow-4.1.0/src/login.c
===================================================================
--- shadow-4.1.0.orig/src/login.c
+++ shadow-4.1.0/src/login.c
@@ -331,7 +331,6 @@
 	char ptime[80];
 #endif
 	int reason = PW_LOGIN;
-	int delay;
 	int retries;
 	int failed;
 	int flag;
@@ -354,6 +353,7 @@
 	char *pam_user;
 	char **ptr_pam_user = &pam_user;
 #else
+	int delay;
 	struct spwd *spwd = NULL;
 #endif
 	/*
@@ -578,7 +578,6 @@
 			alarm (timeout);
 
 		environ = newenvp;	/* make new environment active */
-		delay = getdef_num ("FAIL_DELAY", 1);
 		retries = getdef_num ("LOGIN_RETRIES", RETRIES);
 
 #ifdef USE_PAM
@@ -594,17 +593,12 @@
 
 		/*
 		 * hostname & tty are either set to NULL or their correct values,
-		 * depending on how much we know. We also set PAM's fail delay to
-		 * ours.
+		 * depending on how much we know.
 		 */
 		retcode = pam_set_item (pamh, PAM_RHOST, hostname);
 		PAM_FAIL_CHECK;
 		retcode = pam_set_item (pamh, PAM_TTY, tty);
 		PAM_FAIL_CHECK;
-#ifdef HAVE_PAM_FAIL_DELAY
-		retcode = pam_fail_delay (pamh, 1000000 * delay);
-		PAM_FAIL_CHECK;
-#endif
 		/* if fflg == 1, then the user has already been authenticated */
 		if (!fflg || (getuid () != 0)) {
 			int failcount = 0;
@@ -645,8 +639,6 @@
 			  failed = 0;
 
 			  failcount++;
-			  if (delay > 0)
-			    retcode = pam_fail_delay(pamh, 1000000*delay);
 
 			  retcode = pam_authenticate (pamh, 0);
 
@@ -956,13 +948,16 @@
 		if (pwent.pw_passwd[0] == '\0')
 			pw_auth ("!", username, reason, (char *) 0);
 
+#ifndef USE_PAM
 		/*
 		 * Wait a while (a la SVR4 /usr/bin/login) before attempting
 		 * to login the user again. If the earlier alarm occurs
 		 * before the sleep() below completes, login will exit.
 		 */
+		delay = getdef_num ("FAIL_DELAY", 1);
 		if (delay > 0)
 			sleep (delay);
+#endif
 
 		puts (_("Login incorrect"));
 
Index: shadow-4.1.0/lib/getdef.c
===================================================================
--- shadow-4.1.0.orig/lib/getdef.c
+++ shadow-4.1.0/lib/getdef.c
@@ -56,7 +56,6 @@
 	{"ENV_PATH", NULL},
 	{"ENV_SUPATH", NULL},
 	{"ERASECHAR", NULL},
-	{"FAIL_DELAY", NULL},
 	{"FAILLOG_ENAB", NULL},
 	{"FAKE_SHELL", NULL},
 	{"FTMP_FILE", NULL},
@@ -94,6 +93,7 @@
 	{"ENV_HZ", NULL},
 	{"ENVIRON_FILE", NULL},
 	{"ENV_TZ", NULL},
+	{"FAIL_DELAY", NULL},
 	{"ISSUE_FILE", NULL},
 	{"LASTLOG_ENAB", NULL},
 	{"LOGIN_STRING", NULL},
