Date: Sun, 03 Jun 2001 00:04:55 +0900 (JST) From: Hajimu UMEMOTO <ume@mahoroba.org> To: mdavis@cts.com Cc: freebsd-stable@freebsd.org, security@freebsd.org, wollman@FreeBSD.org, gad@FreeBSD.org Subject: Re: lpd: Malformed from address Message-ID: <20010603.000455.78786804.ume@mahoroba.org> In-Reply-To: <000001c0eb56$6d6ae250$241978d8@cts.com> References: <000001c0eb56$6d6ae250$241978d8@cts.com>
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>>>>> On Sat, 2 Jun 2001 04:23:18 -0700 >>>>> "Morgan Davis" <mdavis@cts.com> said: mdavis> After upgrading two different FreeBSD 4.2 systems to 4.3, they both mdavis> began to exhibit trouble when trying to print to their lpd processes. mdavis> Watching the raw traffic via tcpdump, both are failing immediately when mdavis> lpd tries to resolve the connecting client's address in chkhost(): mdavis> error = getnameinfo(f, f->sa_len, NULL, 0, serv, sizeof(serv), mdavis> NI_NUMERICSERV); mdavis> if (error || atoi(serv) >= IPPORT_RESERVED) mdavis> fatal(0, "Malformed from address"); mdavis> It can be exercised via telnet: mdavis> # telnet golf printer mdavis> Trying 205.163.23.102... mdavis> Connected to golf.cts.com. mdavis> Escape character is '^]'. mdavis> lpd: Malformed from address mdavis> Connection closed by foreign host. mdavis> This happens on both systems, different kernels, one running named and mdavis> one not. What in the world could be causing this? When I ported IPv6 support into FreeBSD from NetBSD, I wrongly brought reserved port checking code into FreeBSD. Originally, FreeBSD's lpd didn't check validity of connection by checking if it comes from reserved port. However, since lpd relies on r-authentication, it should be expected. Though it is easy to get rid of reserved port checking, we should have some considerlation. Any suggestion? -- Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org http://www.imasy.org/~ume/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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