Goal: Recent versions of Linux-PAM support localization of user prompts,
so Samba must use the C locale when invoking PAM (directly or via
/usr/bin/passwd) to ensure that password chat values match the prompts in a
locale-invariant fashion.

Authors: Mathias Gug <mathiaz@ubuntu.com>,
         Steve Langasek <vorlon@debian.org>

Upstream status: submitted in bugzilla bug #5082

Index: samba-3.0.26a/source/smbd/chgpasswd.c
===================================================================
--- samba-3.0.26a.orig/source/smbd/chgpasswd.c
+++ samba-3.0.26a/source/smbd/chgpasswd.c
@@ -126,6 +126,7 @@
 	struct termios stermios;
 	gid_t gid;
 	uid_t uid;
+	char *eptrs[1] = { NULL };
 
 	if (pass == NULL)
 	{
@@ -222,7 +223,7 @@
 	       passwordprogram));
 
 	/* execl() password-change application */
-	if (execl("/bin/sh", "sh", "-c", passwordprogram, NULL) < 0)
+	if (execle("/bin/sh", "sh", "-c", passwordprogram, NULL, eptrs) < 0)
 	{
 		DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
 		return (False);
@@ -498,6 +499,9 @@
 #ifdef WITH_PAM
 	if (lp_pam_password_change()) {
 		BOOL ret;
+#ifdef HAVE_SETLOCALE
+		char *prevlocale = setlocale(LC_MESSAGES, "C");
+#endif
 
 		if (as_root)
 			become_root();
@@ -511,6 +515,9 @@
 		if (as_root)
 			unbecome_root();
 
+#ifdef HAVE_SETLOCALE
+		setlocale(LC_MESSAGES, prevlocale);
+#endif
 		return ret;
 	}
 #endif