From owner-freebsd-questions@freebsd.org Wed May 9 11:31:06 2018 Return-Path: Delivered-To: freebsd-questions@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 8F7F6FB4686 for ; Wed, 9 May 2018 11:31:06 +0000 (UTC) (envelope-from guru@unixarea.de) Received: from ms-10.1blu.de (mail.dpedia.de [178.254.4.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 2A87A68527 for ; Wed, 9 May 2018 11:31:05 +0000 (UTC) (envelope-from guru@unixarea.de) Received: from [89.204.130.103] (helo=localhost.unixarea.de) by ms-10.1blu.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.86_2) (envelope-from ) id 1fGMcj-0003Xp-G3 for freebsd-questions@freebsd.org; Wed, 09 May 2018 12:47:05 +0200 Received: from localhost.my.domain (localhost [127.0.0.1]) by localhost.unixarea.de (8.15.2/8.14.9) with ESMTPS id w49Al1xB003280 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Wed, 9 May 2018 12:47:01 +0200 (CEST) (envelope-from guru@unixarea.de) Received: (from guru@localhost) by localhost.my.domain (8.15.2/8.14.9/Submit) id w49Al0s8003279 for freebsd-questions@freebsd.org; Wed, 9 May 2018 12:47:00 +0200 (CEST) (envelope-from guru@unixarea.de) X-Authentication-Warning: localhost.my.domain: guru set sender to guru@unixarea.de using -f Date: Wed, 9 May 2018 12:47:00 +0200 From: Matthias Apitz To: freebsd-questions@freebsd.org Subject: ssh -X remote does not work due to problem with xauth Message-ID: <20180509104700.GA3259@c720-r314251> Reply-To: Matthias Apitz Mail-Followup-To: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit X-Operating-System: FreeBSD 12.0-CURRENT r314251 (amd64) X-message-flag: Mails containing HTML will not be read! Please send only plain text. User-Agent: Mutt/1.8.0 (2017-02-23) X-Con-Id: 51246 X-Con-U: 0-guru X-Originating-IP: 89.204.130.103 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 May 2018 11:31:06 -0000 When I launch 'ssh -X remote host' to get X11 forwarded to my workstation this does not work, i.e. does not produce a DISPLAY env on the remote host and says: $ ssh -X apitzm@srap16dxr1 Warning: untrusted X11 forwarding setup failed: xauth key data not generated Last login: Wed May 9 12:37:17 2018 from 10.49.8.33 apitzm@srap16dxr1:~> I digged into it with -vv options for ssh and trussing the client. It seems it's our end causing the problem: $ uname -a FreeBSD r314251-amd64 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r314251: Sat Feb 25 17:14:40 CET 2017 root@r303343-amd64:/usr/obj/usr/src/sys/GENERIC amd64 $ truss -s128 -f -o ssh.tr ssh -X -vv apitzm@srap16dxr1 $ grep -i xauth ssh.tr > xauth.txt 20544: stat("/usr/local/bin/xauth",{ mode=-rwxr-xr-x ,inode=2820147,size=41056,blksize=32768 }) = 0 (0x0) 20544: write(2,"debug2: client_x11_get_proto: /usr/local/bin/xauth -f /tmp/ssh-zfFpkwHgD1qj/xauthfile generate :0 MIT-MAGIC-COOKIE-1 untrusted t"...,153) = 153 (0x99) 20545: execve("/usr/local/bin/xauth",0x801459260,0x801459408) = 0 (0x0) 20545: stat("/tmp/ssh-zfFpkwHgD1qj/xauthfile-c",0x7fffffffdc40) ERR#2 'No such file or directory' 20545: openat(AT_FDCWD,"/tmp/ssh-zfFpkwHgD1qj/xauthfile-c",O_WRONLY|O_CREAT|O_EXCL,0600) = 3 (0x3) 20545: pathconf("/tmp/ssh-zfFpkwHgD1qj/xauthfile-c",_PC_LINK_MAX) = 32767 (0x7fff) 20545: link("/tmp/ssh-zfFpkwHgD1qj/xauthfile-c","/tmp/ssh-zfFpkwHgD1qj/xauthfile-l") = 0 (0x0) 20545: access("/tmp/ssh-zfFpkwHgD1qj/xauthfile",F_OK) ERR#2 'No such file or directory' 20545: open("/tmp/ssh-zfFpkwHgD1qj/xauthfile",O_RDONLY,0666) ERR#2 'No such file or directory' 20545: access("/tmp/ssh-zfFpkwHgD1qj/xauthfile",F_OK) ERR#2 'No such file or directory' 20545: write(2,"/usr/local/bin/xauth: file /tmp/ssh-zfFpkwHgD1qj/xauthfile does not exist\n",75) = 75 (0x4b) 20545: access("/tmp/kde-guru/xauth-1001-_0",R_OK) = 0 (0x0) 20545: open("/tmp/kde-guru/xauth-1001-_0",O_RDONLY,0666) = 4 (0x4) 20545: write(2,"/usr/local/bin/xauth: (argv):1: ",33) = 33 (0x21) 20545: lstat("/tmp/ssh-zfFpkwHgD1qj/xauthfile-c",{ mode=-rw------- ,inode=8331,size=0,blksize=32768 }) = 0 (0x0) 20545: unlink("/tmp/ssh-zfFpkwHgD1qj/xauthfile-c") = 0 (0x0) 20545: lstat("/tmp/ssh-zfFpkwHgD1qj/xauthfile-l",{ mode=-rw------- ,inode=8331,size=0,blksize=32768 }) = 0 (0x0) 20545: unlink("/tmp/ssh-zfFpkwHgD1qj/xauthfile-l") = 0 (0x0) 20544: unlink("/tmp/ssh-zfFpkwHgD1qj/xauthfile") ERR#2 'No such file or directory' 20544: write(2,"Warning: untrusted X11 forwarding setup failed: xauth key data not generated\r\n",78) = 78 (0x4e) Any ideas? Thanks matthias -- Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub May, 9: Спаси́бо освободители! Thank you very much, Russian liberators!