From owner-freebsd-net@freebsd.org Fri Aug 16 12:45:47 2019 Return-Path: Delivered-To: freebsd-net@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 846E9CB457 for ; Fri, 16 Aug 2019 12:45:47 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 46932f33b5z4D5F for ; Fri, 16 Aug 2019 12:45:45 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id x7GCjTKZ025356 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 16 Aug 2019 12:45:32 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: Received: from [10.58.0.4] (dadv@[10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id x7GCjJ18006402 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT) for ; Fri, 16 Aug 2019 19:45:19 +0700 (+07) (envelope-from eugen@grosbein.net) To: "freebsd-net@freebsd.org" From: Eugene Grosbein Subject: Software IPSEC AES-CTR/SHA-256 broken Message-ID: <9650ba58-ed9b-ec6b-8b9f-ed5cb4853f9b@grosbein.net> Date: Fri, 16 Aug 2019 19:45:19 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=3.2 required=5.0 tests=BAYES_00, DATE_IN_FUTURE_96_Q, LOCAL_FROM, SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.9 DATE_IN_FUTURE_96_Q Date: is 4 days to 4 months after Received: * date * 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record * -0.0 SPF_PASS SPF: sender matches SPF record * 2.6 LOCAL_FROM From my domains X-Spam-Level: *** X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 46932f33b5z4D5F X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-3.91 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; DMARC_NA(0.00)[grosbein.net]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[3]; IP_SCORE(-0.85)[ip: (-0.45), ipnet: 2a01:4f8::/29(-1.95), asn: 24940(-1.84), country: DE(-0.01)]; R_SPF_PERMFAIL(0.00)[]; NEURAL_HAM_SHORT(-0.96)[-0.960,0]; TO_DN_EQ_ADDR_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2019 12:45:47 -0000 Hi! I used IPSEC/gif (ipencap) with static Blowfish/SHA1 keys for years for VPN tunnels between FreeBSD routers. After recent Blowfish deprecation notice, I tried switching to AES-CTR/SHA-256 instead only to find that transit RDP TCP streams start to break often (every 20 minutes or so). I switched back to Blowfish/SHA1 and problem disappeared. While using AES-CTR/SHA-256, "netstat -p esp -ss" shows increasing counters for: packets dropped; bad encryption detected packets dropped; bad authentication detected These counters stay zero when only Blowfish is used. Both sides have no AES-NI hardware support and aesni.ko kernel module is not even loaded. FreeBSD 11.2-STABLE/amd64 r343942 at one side is used and 11.2-STABLE/amd64 r343953 at another side. I managed to reproduce the problem using simple ssh connection over tunnel built with commands: ifconfig gif1 create tunnel 1.1.1.1 2.2.2.2 ifconfig gif1 inet 192.168.80.242 192.168.80.241 netmask 255.255.255.252 mtu 1440 And /etc/ipsec.conf: flush; spdflush; add 1.1.1.1 2.2.2.2 esp 1013 -m transport -E aes-ctr "M28_)KDFV,iFVHNIKO-p" -A hmac-sha2-256 "rdijokg&YRDYi(I%R0oMJN%()H532d92"; add 2.2.2.2 1.1.1.1 esp 2013 -m transport -E aes-ctr "G5of)Gbn556reg_+;mVz" -A hmac-sha2-256 "?op;_rf{89CE$DC09*3$RFgi7y9)i-e]"; spdadd 2.2.2.2/32 1.1.1.1/32 icmp -P out none; spdadd 2.2.2.2/32 1.1.1.1/32 esp -P out none; spdadd 2.2.2.2/32 1.1.1.1/32 any -P out ipsec esp/transport//require; spdadd 1.1.1.1/32 2.2.2.2/32 any -P out ipsec esp/transport//use; #EOF No IKE daemon used. Another side has symmetric settings. The problem reproduces while making ssh connection from 192.168.80.242 to 192.168.80.241: $ ssh -vp 10022 192.168.80.241 dd if=random.bin > /dev/null The file random.bin contains some data obtained from /dev/urandom. N.B.: SSH connection does not break as it tolerates delays produced by TCP retransmits much better comparing to RDP.