From owner-freebsd-questions@FreeBSD.ORG Sat Jun 20 12:31:51 2015 Return-Path: Delivered-To: freebsd-questions@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E41968EA for ; Sat, 20 Jun 2015 12:31:50 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mx1.eichornenterprises.com (mx1.eichornenterprises.com [104.236.13.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx1.eichornenterprises.com", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id A0268CC1 for ; Sat, 20 Jun 2015 12:31:50 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mail.eichornenterprises.com (cpe-24-166-126-146.neo.res.rr.com [24.166.126.146]); by mx1.eichornenterprises.com (OpenSMTPD) with ESMTP id 96f6b64e; Sat, 20 Jun 2015 08:31:47 -0400 (EDT) Received: by mail.eichornenterprises.com (OpenSMTPD) with ESMTPSA id 8a2b724b; TLS version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO; Sat, 20 Jun 2015 08:31:47 -0400 (EDT) Message-ID: <1434803538.13005.19.camel@michaeleichorn.com> Subject: Re: denyhosts/pfctl to block repeated logins? From: "Michael B. Eichorn" To: andrew clarke , John Holland Cc: freebsd-questions@freebsd.org Date: Sat, 20 Jun 2015 08:32:18 -0400 In-Reply-To: <20150620115544.GA77489@ozzmosis.com> References: <99DC5CD3-1D40-4A6B-B553-DA2619E942EF@vin-dit.org> <20150620115544.GA77489@ozzmosis.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-9uyPz7gtWY0s9OrsZQTq" X-Mailer: Evolution 3.16.3 Mime-Version: 1.0 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Jun 2015 12:31:51 -0000 --=-9uyPz7gtWY0s9OrsZQTq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2015-06-20 at 21:55 +1000, andrew clarke wrote: > On Sat 2015-06-20 07:34:50 UTC-0400, John Holland (jholland@vin-dit.org > ) wrote: >=20 > > What is the best tool to use to block repeated login attempts from > > unauthorized hosts? And for deny hosts, how you unblock someone who > > is legitimate? >=20 > "Best tool" is difficult to answer since it depends on your exact > requirements. >=20 > Also once an admin finds an IP blocker that works for them, they may > tend to stick with it rather than try all the alternatives. >=20 > For blocking unsuccessful ssh logins, sshguard-ipfw works for me. >=20 > http://www.sshguard.net/docs/faqs/ >=20 I will second sshguard as an excellent automated blocker. But since the OP mentions pfctl in the subject line, they probably want sshguard-pf. There is also a no-firewall version for running in jails. I prefer sshguard as it is a daemon like C program whereas denyhosts is a python script. So I get a few less dependencies and a bit more speed. SSHguard can handle more than just ssh logins, but sendmail, dovecot, and other servers as well. Unblocking no matter what you are using best consists of 2 steps: 1) Remove the blocked address from the firewall table, hosts.deny, etc. 2) If possible whitelist the hostname(s)/address(es)/subnet(s) --=-9uyPz7gtWY0s9OrsZQTq Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCCEqAw ggYwMIIFGKADAgECAgMOXcYwDQYJKoZIhvcNAQELBQAwgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVu dCBDQTAeFw0xNTA2MTMyMDI0NDZaFw0xNjA2MTQwMDM1NTBaMEgxHzAdBgNVBAMMFmlrZUBtaWNo YWVsZWljaG9ybi5jb20xJTAjBgkqhkiG9w0BCQEWFmlrZUBtaWNoYWVsZWljaG9ybi5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDJVdWALPz5h2s5zUQGIJYl6Vp8FPtZNko8q/3s crCsxXJLprMaDdpnqTsmkbmEfKvsqPQE6HVOpGxVRTl/tCm+VvouW9eY9ITMigb1OnHdU13CKO0j 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