From owner-freebsd-hackers@freebsd.org Wed Jan 29 10:25:03 2020 Return-Path: Delivered-To: freebsd-hackers@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 D3F821D2979 for ; Wed, 29 Jan 2020 10:25:03 +0000 (UTC) (envelope-from gljennjohn@gmail.com) Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) (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 48703g0dnyz4Q5M for ; Wed, 29 Jan 2020 10:25:02 +0000 (UTC) (envelope-from gljennjohn@gmail.com) Received: by mail-wm1-x344.google.com with SMTP id q9so5558509wmj.5 for ; Wed, 29 Jan 2020 02:25:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:in-reply-to:references:reply-to :mime-version:content-transfer-encoding; bh=lkFJTbnuBWw1TmFoblgrURi2X0F+/GETLSFM5vk5RGk=; b=ST4n8e7Wm7QGz2Q+uAs569j++/zeEmhqoTtc9D6AgBSB3eAnIkvAdA/qf+KM6e3Mxa u8+XT5ASbYWmp78niTN4UWke+H2NKupBNMFBckMmogITaM8BrwywvMu5lty8c15XqnsH P7xp131N5x1khVgc8L/r9yFGNSd7UX8/6xlmfjYBN2F/Y0+u3IL7CiqR2+nPN/XaWRuo hhRbqVxe6FciOl74OnS/tEIqmvsK1uu57ckFMNvqzUpZJKaqHwq1wBcKbKkzvJwGvX1A 8Xe2UMhwFNyPUut+D0fqG6WqqZbe4JRZ6CnUS/VlhPPwoiUlukALg2JzOOoa0O+T0FcB aNkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:reply-to:mime-version:content-transfer-encoding; bh=lkFJTbnuBWw1TmFoblgrURi2X0F+/GETLSFM5vk5RGk=; b=KrDRd3siU6ow24uAnNLdeh/8Be8EaC7NaJXvmpNyEWDFbJN3OmR9Qh8DrDi7qZp3mx Xm9LV/gfJekt5gd62uPPjx8nJ5GL3iz0alQC5vh3NcidTLhpIF/CbQgnp+NBz1cZ+rK6 oXJe8tJdUj4oxP1L4iv3Sa8m91SwKQ+40wIH6UK9UTHoM3yLQvTyIj6dF5Paf7N9C0jt H4Se5yh8UZ6IoeEd2/KOLuvuXLdQdzsCex3fX9/3LRiCn8Vnl0rh4OVefKQeGXCkt2Sc sj84UVpErRNxWn62pCT+nN3woZKTuxI5gnnO4SNQ2ptf47G2ZKoE7Wm5krHmiE/LcPua 5xOw== X-Gm-Message-State: APjAAAXIaz0AQjz/m7gIDlVbjnaRufpNHaw1iC9AbPEBdjMrtJreEgS/ XfvTiqHzAk9Nh2P1XoaEcUm5A3q5 X-Google-Smtp-Source: APXvYqweXinpVyO64nTbSgZCUXfotuZaXy4i7w7Nr7qL5C8PRCN7t6pfvfEtPwH1/0IL/SJE6welIw== X-Received: by 2002:a1c:960c:: with SMTP id y12mr10642203wmd.9.1580293501302; Wed, 29 Jan 2020 02:25:01 -0800 (PST) Received: from ernst.home (p5B02394F.dip0.t-ipconnect.de. [91.2.57.79]) by smtp.gmail.com with ESMTPSA id q6sm2239631wrx.72.2020.01.29.02.25.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2020 02:25:00 -0800 (PST) Date: Wed, 29 Jan 2020 11:25:00 +0100 From: Gary Jennejohn To: Gordon Bergling via freebsd-hackers Cc: Gordon Bergling Subject: Re: More secure permissions for /root and /etc/sysctl.conf Message-ID: <20200129112500.368610e8@ernst.home> In-Reply-To: <20200129105325.600cddc1@ernst.home> References: <20200129092631.GA22505@lion.0xfce3.net> <20200129105325.600cddc1@ernst.home> Reply-To: gljennjohn@gmail.com X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; amd64-portbld-freebsd13.0) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48703g0dnyz4Q5M X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=ST4n8e7W; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of gljennjohn@gmail.com designates 2a00:1450:4864:20::344 as permitted sender) smtp.mailfrom=gljennjohn@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; HAS_REPLYTO(0.00)[gljennjohn@gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; REPLYTO_ADDR_EQ_FROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; IP_SCORE(0.00)[ip: (2.56), ipnet: 2a00:1450::/32(-2.52), asn: 15169(-1.78), country: US(-0.05)]; 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]; RECEIVED_SPAMHAUS_PBL(0.00)[79.57.2.91.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_REPLYTO(0.00)[gmail.com]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[4.4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; FREEMAIL_CC(0.00)[googlemail.com]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jan 2020 10:25:03 -0000 On Wed, 29 Jan 2020 10:53:25 +0100 Gary Jennejohn wrote: > On Wed, 29 Jan 2020 10:26:31 +0100 > Gordon Bergling via freebsd-hackers wrote: > > > Hi, > > > > I recently stumbled upon the default world readable permissons of /root and > > /etc/sysctl.conf. I think that it would be more secure to reduce the default > > permission for /root to 0700 and to 0600 for /etc/sysctl.conf. > > > > I prepared a differtial for the proposed change: > > https://reviews.freebsd.org/D23392 > > > > What do you think? > > > > I think that changing the permissions on / would defeat the purpose of > /etc/devd.conf and then adding users to certain groups in /etc/group > to make devices usable without having to escalate to root rights. > I decided to actually test this case, since I thought I should back up my opinion with some facts. So, I did chmod 700 / and rebooted. I wasn't able to login as a normal user because an error was raised about not being able to find the root for audit (or similar wording). After changing root back to 755 and remounting /home I could log in. Your idea may work if all filesystems are in one big partition, I can't really say, but on my system /, /var, /usr and /home are separate partitions/disks. -- Gary Jennejohn