Date: Tue, 15 Oct 2013 16:16:40 -0400 (EDT) From: Garrett Wollman <wollman@xyz.csail.mit.edu> To: FreeBSD-gnats-submit@freebsd.org Subject: ports/183006: GSSAPI key exchange broken in openssh-portable 6.3 Message-ID: <201310152016.r9FKGe7l051191@xyz.csail.mit.edu> Resent-Message-ID: <201310152020.r9FKK0rp040134@freefall.freebsd.org>
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>Number: 183006 >Category: ports >Synopsis: GSSAPI key exchange broken in openssh-portable 6.3 >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-ports-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Oct 15 20:20:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Garrett Wollman >Release: FreeBSD 9.1-RELEASE-p7 amd64 >Organization: >Environment: System: FreeBSD xyz.csail.mit.edu 9.1-RELEASE-p7 FreeBSD 9.1-RELEASE-p7 #34 r255669M: Fri Oct 11 13:04:40 EDT 2013 wollman@xyz.csail.mit.edu:/usr/obj/usr/src/sys/CSAIL amd64 >Description: After upgrading to openssh-portable-6.3.p1,1, GSSAPI key exchange fails. The client receives a disconnect like so: OpenSSH_6.2p2-hpn13v14 FreeBSD-openssh-portable-6.2.p2_3,1, OpenSSL 0.9.8y 5 Feb 2013 debug1: Reading configuration data /home/wollman/.ssh/config debug1: /home/wollman/.ssh/config line 38: Applying options for * debug1: Reading configuration data /usr/local/etc/ssh/ssh_config debug1: /usr/local/etc/ssh/ssh_config line 56: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to xyz.csail.mit.edu [128.31.0.28] port 22. debug1: Connection established. debug3: Incorrect RSA1 identifier debug3: Could not load "/home/wollman/.ssh/id_rsa" as a RSA1 public key debug1: identity file /home/wollman/.ssh/id_rsa type 1 debug1: identity file /home/wollman/.ssh/id_rsa-cert type -1 debug3: Incorrect RSA1 identifier debug3: Could not load "/home/wollman/.ssh/id_dsa" as a RSA1 public key debug1: identity file /home/wollman/.ssh/id_dsa type 2 debug1: identity file /home/wollman/.ssh/id_dsa-cert type -1 debug3: Incorrect RSA1 identifier debug3: Could not load "/home/wollman/.ssh/id_ecdsa" as a RSA1 public key debug1: identity file /home/wollman/.ssh/id_ecdsa type 3 debug1: identity file /home/wollman/.ssh/id_ecdsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2p2-hpn13v14 FreeBSD-openssh-portable-6.2.p2_3,1 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.3p1-hpn14v2 FreeBSD-openssh-portable-6.3.p1,1 debug1: match: OpenSSH_6.3p1-hpn14v2 FreeBSD-openssh-portable-6.3.p1,1 pat OpenSSH* debug2: fd 3 setting O_NONBLOCK debug1: Offering GSSAPI proposal: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-gex-sha1-A/vxljAEU54gt9a48EiANQ==,gss-group1-sha1-A/vxljAEU54gt9a48EiANQ==,gss-group14-sha1-A/vxljAEU54gt9a48EiANQ==,gss-gex-sha1-bontcUwnM6aGfWCP21alxQ==,gss-group1-sha1-bontcUwnM6aGfWCP21alxQ==,gss-group14-sha1-bontcUwnM6aGfWCP21alxQ==,gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q== debug3: load_hostkeys: loading entries for host "xyz.csail.mit.edu" from file "/home/wollman/.ssh/known_hosts" debug3: load_hostkeys: loaded 0 keys debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: AUTH STATE IS 0 debug2: kex_parse_kexinit: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-gex-sha1-A/vxljAEU54gt9a48EiANQ==,gss-group1-sha1-A/vxljAEU54gt9a48EiANQ==,gss-group14-sha1-A/vxljAEU54gt9a48EiANQ==,gss-gex-sha1-bontcUwnM6aGfWCP21alxQ==,gss-group1-sha1-bontcUwnM6aGfWCP21alxQ==,gss-group14-sha1-bontcUwnM6aGfWCP21alxQ==,gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q==,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss,null debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,aes192-cbc,aes256-cbc debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,aes192-cbc,aes256-cbc debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib@openssh.com debug2: kex_parse_kexinit: none,zlib@openssh.com debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5-etm@openssh.com debug1: REQUESTED ENC.NAME is 'aes128-ctr' debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none debug2: mac_setup: found hmac-md5-etm@openssh.com debug1: REQUESTED ENC.NAME is 'aes128-ctr' debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none debug1: Doing group exchange Connection closed by 128.31.0.28 The server log shows: Oct 15 15:46:31 xyz sshd[89626]: SSH: Server;Ltype: Version;Remote: 128.30.28.20-55528;Protocol: 2.0;Client: OpenSSH_6.2p2-hpn13v14 FreeBSD-openssh-portable-6.2.p2_3,1 Oct 15 15:46:31 xyz sshd[89626]: SSH: Server;Ltype: Kex;Remote: 128.30.28.20-55528;Enc: aes128-ctr;MAC: hmac-md5-etm@openssh.com;Comp: none [preauth] Oct 15 15:46:31 xyz sshd[89626]: fatal: unsupported kex alg gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g== [preauth] An algorithm proposed by the server should not be failing. >How-To-Repeat: Upgrade to 6.3 and try to log in to a host that uses GSSAPI Key Exchange. >Fix: Don't know. Looking at the source, this seems to be a "can't happen" condition. I've downgraded to the last 6.2 for now. >Release-Note: >Audit-Trail: >Unformatted:
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