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Description: distinguish between password manipulation failure and missing user.
Author: Martin Schwenke <martin@meltin.net>

Index: pam/modules/pam_unix/passverify.c
===================================================================
--- pam.orig/modules/pam_unix/passverify.c
+++ pam/modules/pam_unix/passverify.c
@@ -749,7 +749,7 @@
     struct passwd *tmpent = NULL;
     struct stat st;
     FILE *pwfile, *opwfile;
-    int err = 1;
+    int err = 1, found = 0;
     int oldmask;
 #ifdef WITH_SELINUX
     security_context_t prev_context=NULL;
@@ -820,6 +820,7 @@
 
 	    tmpent->pw_passwd = assigned_passwd.charp;
 	    err = 0;
+	    found = 1;
 	}
 	if (putpwent(tmpent, pwfile)) {
 	    D(("error writing entry to password file: %m"));
@@ -862,7 +863,7 @@
 	return PAM_SUCCESS;
     } else {
 	unlink(PW_TMPFILE);
-	return PAM_AUTHTOK_ERR;
+	return found ? PAM_AUTHTOK_ERR : PAM_USER_UNKNOWN;
     }
 }