Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gRHT6-00052K-3t for pgsql-bugs@arkaria.postgresql.org; Mon, 26 Nov 2018 14:02:32 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1gRHT0-0002vv-90 for pgsql-bugs@arkaria.postgresql.org; Mon, 26 Nov 2018 14:02:26 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gRHSz-0002vo-4r for pgsql-bugs@lists.postgresql.org; Mon, 26 Nov 2018 14:02:26 +0000 Received: from out4-smtp.messagingengine.com ([66.111.4.28]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gRHSr-0007AT-NL for pgsql-bugs@lists.postgresql.org; Mon, 26 Nov 2018 14:02:23 +0000 Received: from compute7.internal (compute7.nyi.internal [10.202.2.47]) by mailout.nyi.internal (Postfix) with ESMTP id AF149217D0; Mon, 26 Nov 2018 09:02:15 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute7.internal (MEProxy); Mon, 26 Nov 2018 09:02:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; bh=dW7TJZt/NExYdOtb0gfkU5RJDkECQrJ9q0hY0m52y 0w=; b=KOd0QAQQbjI3JeDlGE45JIHVtEGuZhTsCGBgswEmk992YlJlJDxCsBZ2x aKlaFlEsAluApFu0tQpg/UdfmdPUTzlUxLi+THTfwtPsvSg/VhOwtibkJNOvmpSe ckQxB6vRDonorZ8FnNKFEXHnQtc54hQp2mkQKg0L+4E9S8Cq1G337R9/4idJq/Hi /ZPOx5TLMi2rjr3TAjC7LYDj9corSoh5AD80z96yj+LOl7Qi7fnr+XmwiaQn4tbu zdNBdFusql9zfs6C+Y/0UmdLE1DW3UZP5ti0Lh9OK1pN3HZpv7WA2OiMLuQhu49G zo5gH3qVsLI3o0RapKBH/E8EpPlZA== X-ME-Sender: X-ME-Proxy: Received: from april.pezone.net (p5df34ab1.dip0.t-ipconnect.de [93.243.74.177]) by mail.messagingengine.com (Postfix) with ESMTPA id 4E225103BA; Mon, 26 Nov 2018 09:02:13 -0500 (EST) Subject: Re: BUG #15520: PAM authentication + domain socket -> DNS query for symbolic hostname [local] To: Thomas Munro , Albert Schabhuetl References: <15520-4c266f986998e1c5@postgresql.org> <1818527878.10526478.1543176582167@mail.yahoo.com> Cc: PostgreSQL mailing lists From: Peter Eisentraut Openpgp: preference=signencrypt Autocrypt: addr=peter.eisentraut@2ndquadrant.com; 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Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 25/11/2018 23:30, Thomas Munro wrote: >>> I wonder if anyone out there has come to rely on the value "[local]" >> I vote for changing it, and documenting it in the release notes. > Yeah. Here is a draft patch to change that. Test output: > > $ psql -h localhost postgres munro > PAM_USER=munro, PAM_RHOST=localhost > $ psql postgres munro > PAM_USER=munro, PAM_RHOST= I think this is the right thing to do. About your patch, if we're not going to set PAM_RHOST, then we should also avoid the call to pg_getnameinfo_all() earlier in CheckPAMAuth(). Look at the original patch linked earlier in the thread; we just need to put if statements around both of those hunks. -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services