Date: Tue, 28 Oct 2003 05:50:11 -0800 (PST) From: Luigi Rizzo <rizzo@icir.org> To: FreeBSD-gnats-submit@FreeBSD.org Cc: dinoex@FreeBSD.org Subject: ports/58630: silently drop messages in noattach (change request) Message-ID: <200310281350.h9SDoArY023581@xorpc.icir.org> Resent-Message-ID: <200310281400.h9SE0R0b080874@freefall.freebsd.org>
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>Number: 58630
>Category: ports
>Synopsis: silently drop messages in noattach (change request)
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 28 06:00:27 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Luigi Rizzo
>Release: FreeBSD 4.8-RELEASE i386
>Organization:
Dip.Ing.Informazione - univ.pisa
>Environment:
System: FreeBSD xorpc.icir.org 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Mon Apr 7 20:59:56 PDT 2003 root@xorpc.icir.org:/usr/src/sys/compile/ICIR-4.8-USB i386
>Description:
noattach will send a REJECT for messages it does not want to
deal with. But the vast majority of these virus-generated
messages contain a fake sender address, so the reject will
cause an additional bounced email, or even worse a backfire
towards the unlucky owner of the fake address.
I have been in both categories with the recent Sobig.F
virus, receiving between 60 and 80000 (yes no typo, eighty
thousand) messages per day, and it is no fun.
I believe it is a lot safer to silently drop unwanted
messages rather than bouncing them.
The attached patch does it.
>How-To-Repeat:
>Fix:
--- noattach.c.orig Thu Aug 21 13:52:48 2003
+++ noattach.c Tue Oct 28 13:37:49 2003
@@ -651,7 +651,11 @@
safe_free(lines[i]);
safe_free(lines);
(void)mlfi_cleanup(ctx, true);
+#if 0
return SMFIS_REJECT;
+#else
+ return SMFIS_DISCARD;
+#endif
}
else if (cl_err == -1) {
/* can't accept this message right now */
>Release-Note:
>Audit-Trail:
>Unformatted:
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