From owner-freebsd-questions@freebsd.org Mon Feb 17 15:49:48 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AB6E523CA67 for ; Mon, 17 Feb 2020 15:49:48 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 48LpMb0z5qz3x40 for ; Mon, 17 Feb 2020 15:49:46 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1581954587; x=1584546587; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info; bh=wwHMNCoTLNJhfP9o94wVuCmrjbLIZ6OieX41tZGWW04=; b=MX49dX0xMtWM5uq4xjdrBP4beu+TFIpyWh1hg2T2I9lsN4u+dh5PqIangqTEG9keYCgsE1vy1/0PkpFpcWQtxEorOTF/0XUWDFLxtVAOa2hWMh8TSSYhl9aie8j08hA+NY1f1O2hNDRpC81DVffIdrHQWAc14p5Vj115GBHj0/k= X-Thread-Info: NDI1MC4xMi43NDAwMDAwMDc2MWU4ZC5mcmVlYnNkLXF1ZXN0aW9ucz1mcmVlYnNkLm9yZw== Received: from r3.sg.in.socketlabs.com (r3.sg.in.socketlabs.com [142.0.179.13]) by mxsg2.email-od.com with ESMTP; Mon, 17 Feb 2020 10:49:44 -0500 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r3.sg.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Mon, 17 Feb 2020 10:49:43 -0500 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.92.3 (FreeBSD)) (envelope-from ) id 1j3ieT-0000ry-7w for freebsd-questions@freebsd.org; Mon, 17 Feb 2020 15:49:41 +0000 Date: Mon, 17 Feb 2020 15:49:41 +0000 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: disabling "weak" algorithms in sshd Message-Id: <20200217154941.59beeadf22c5100ad2e5c41c@sohara.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48LpMb0z5qz3x40 X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=MX49dX0x; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.10.freebsd-questions=freebsd.org@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.10.freebsd-questions=freebsd.org@email-od.com X-Spamd-Result: default: False [-1.89 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.980,0]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[sohara.org]; FORGED_SENDER_VERP_SRS(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_COUNT_THREE(0.00)[4]; IP_SCORE(0.09)[ip: (-0.25), ipnet: 142.0.176.0/22(0.52), asn: 7381(0.26), country: US(-0.05)]; MV_CASE(0.50)[]; DKIM_TRACE(0.00)[email-od.com:+]; RCVD_IN_DNSWL_NONE(0.00)[198.176.0.142.list.dnswl.org : 127.0.15.0]; ENVFROM_VERP(0.00)[]; FORGED_SENDER(0.00)[steve@sohara.org,4250.10.freebsd-questions=freebsd.org@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.10.freebsd-questions=freebsd.org@email-od.com]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Feb 2020 15:49:48 -0000 On Mon, 17 Feb 2020 15:09:04 +0000 Shamim Shahriar wrote: > Is there any way to "select" or "selectively disable" algorithms and > hashes from sshd? According to various web sources, certain > implementation on certain distributions might have options to amend the > list, but none of the examples I have found worked on my FreeBSD system. Try. man sshd_config It should tell you everything you can do by way of configuring the ssh server. -- Steve O'Hara-Smith