From owner-freebsd-security@freebsd.org Tue Jun 18 13:09:33 2019 Return-Path: Delivered-To: freebsd-security@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A229F15BB58D for ; Tue, 18 Jun 2019 13:09:33 +0000 (UTC) (envelope-from rsimmons0@gmail.com) Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 6A373742E8 for ; Tue, 18 Jun 2019 13:09:32 +0000 (UTC) (envelope-from rsimmons0@gmail.com) Received: by mail-lj1-x234.google.com with SMTP id i21so13080591ljj.3 for ; Tue, 18 Jun 2019 06:09:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=lEq3rfr8TuCELKeVgsgpOsyxlH4kp+Wbfszdj+plQNU=; b=cmOmB699WdvwtcWCxQCKShclqkqBNk0WEcdS5vtUMSF6yNXItrWkgOIJ88uUmap432 0GzLaokGph+WR1yHQniCvtLJiI+m2K2ZNxu11PZPqszz63GQ+c7Zn7F2JdmcHgPsRCmL 6k20hrCQDppRids3a2u2tTevuVPWZVllcn0oEMxU3z8fSaxrmvX9guGTgdGC022ow8O2 BWglnpW07k5GMtF46I1L0ZRKqIi7hlhEMsNNnlF9ufqJHMNkVMTdx7Mr7lTrWvFIUCPv i8OyyrRwB8cexfptN6fY7LXSq8TKURzUfQH7KrI2oz7T9DSi+Vd+C9EOiENWXdetDHNY mANg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=lEq3rfr8TuCELKeVgsgpOsyxlH4kp+Wbfszdj+plQNU=; b=LL+EalN5MJYIFmZ8ejQu1LsLfgkBxSFfaEtp+AgMfUYyptkx4DbqZf7bmhO/auG13R xdo7SSl/K50n0FiBjwD2IdZ7XD70nu4tywfuUkRAW3IhbBSHRK/lWmwXj71iFsZqk8da oX099fuX/vNKG/Y+m3+f6QeLGXocWZ5yhT2txHcwuldZtsxFYtaUq9OvxG9KcRL3Y8KX xhcf+r6lsAm8yEEgwmESXo/aP/1+UsFyvGuTFbVESR+2Xln0FJB+bPbohBKMzAo4ukZU bzVkwQd8An//qlzs6QJGHx9eTk6/iboF8Hfcwveo5pV8ZnMmCXRM3Cz0e47jrNad2ENe r3ug== X-Gm-Message-State: APjAAAUGT20dtKBo2wSWXHKSreVc2XxPVbc3p80lEab40WxrymlpksJg o85eh1WBcMLpmVGHC+Mq+5K3HGNCMJL6xfELF0I= X-Google-Smtp-Source: APXvYqxMY6tHkMrkWMdqb9svz6DIhufywjUy/lXnCvdQnWHbdPkcj9ygEQSodM34XcWypgcR3Jdk5klQ3UqDaTbx5S8= X-Received: by 2002:a2e:9a9a:: with SMTP id p26mr28622980lji.64.1560863370799; Tue, 18 Jun 2019 06:09:30 -0700 (PDT) MIME-Version: 1.0 References: <20190618075954.GA30296@admin.sibptus.ru> In-Reply-To: From: Robert Simmons Date: Tue, 18 Jun 2019 09:09:19 -0400 Message-ID: Subject: Re: Untrusted terminals: OPIE vs security/pam_google_authenticator To: Dan Langille Cc: Victor Sudakov , freebsd-security@freebsd.org X-Rspamd-Queue-Id: 6A373742E8 X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=cmOmB699; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of rsimmons0@gmail.com designates 2a00:1450:4864:20::234 as permitted sender) smtp.mailfrom=rsimmons0@gmail.com X-Spamd-Result: default: False [-5.85 / 15.00]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; URI_COUNT_ODD(1.00)[5]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; NEURAL_HAM_SHORT(-0.98)[-0.981,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[4.3.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-2.86)[ip: (-9.41), ipnet: 2a00:1450::/32(-2.49), asn: 15169(-2.32), country: US(-0.06)]; RCVD_COUNT_TWO(0.00)[2] Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jun 2019 13:09:33 -0000 You are correct for SSH. On Tue, Jun 18, 2019, 09:07 Dan Langille wrote: > On Jun 18, 2019, at 9:02 AM, Robert Simmons wrote: > > On Tue, Jun 18, 2019, 04:01 Victor Sudakov wrote: > > Dear Colleagues, > > I've used OPIE for many years (and S/Key before that) to login to my > system from untrusted terminals (cafes, libraries etc). > > Now I've read an opinion that OPIE is outdated (and indeed its upstream > distribution is gone) and that pam_google_authenticator would be more > secure: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237270 > > Is that truly so? With 20 words in OPIE and only 6 digits in > pam_google_authenticator, how strong is pam_google_authenticator against > brute force and other attacks? > > > Victor, > > To throw a new wrinkle in the equation: Google Authenticator codes can be > intercepted by a phishing page. U2F protocol is even better, and can't be > intercepted via phishing. > > There are U2F libraries in ports. > > https://en.wikipedia.org/wiki/Universal_2nd_Factor > > Cheers, > Rob > > > > If my Google Authenticator codes are on my phone, and I'm entering them > into my ssh session, how is a phishing page involved? > > =E2=80=94 > Dan Langille > http://langille.org/ > > > > > >