[Bug 196112] New: Cannot connect to sshd after updating from 10.0 to 10.1

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Thu Dec 18 23:06:34 UTC 2014 

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196112

            Bug ID: 196112
           Summary: Cannot connect to sshd after updating from 10.0 to
                    10.1
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rec at rcousins.com

Cannot connect to server via ssh from any other machine (have tried various
versions of ssh, putty, etc.). Server always complains 'Unsupported hostkey
type 67207904 [preauth]' while client just sees 'connection closed by UNKNOWN'
or similar.

Server claims to be 'sshd version OpenSSH_6.4p1_hpn13v11 FreeBSD-20131111,
OpenSSL 1.0.1e-freebsd 11 Feb 2013'

This configuration worked great until I ran freebsd-update to move from 10.0 to
10.1. All other system services appear to be fine.

Here is a sample test run of sshd (connected to port 44) via local lan:
[root at babbage /etc/ssh]# /usr/sbin/sshd -p 44 -d
debug1: HPN Buffer Size: 65536
debug1: sshd version OpenSSH_6.4p1_hpn13v11 FreeBSD-20131111, OpenSSL
1.0.1e-freebsd 11 Feb 2013
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type ECDSA
debug1: private host key: #2 type 3 ECDSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-p'
debug1: rexec_argv[2]='44'
debug1: rexec_argv[3]='-d'
debug1: Bind to port 44 on ::.
debug1: Server TCP RWIN socket size: 65536
debug1: HPN Buffer Size: 65536
Server listening on :: port 44.
debug1: Bind to port 44 on 0.0.0.0.
debug1: Server TCP RWIN socket size: 65536
debug1: HPN Buffer Size: 65536
Server listening on 0.0.0.0 port 44.
debug1: fd 5 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
debug1: res_init()
Connection from 10.0.0.142 port 60280
debug1: HPN Disabled: 0, HPN Buffer Size: 65536
debug1: Client protocol version 2.0; client software version PuTTY_Release_0.62
debug1: no match: PuTTY_Release_0.62
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.4_hpn13v11 FreeBSD-20131111
debug1: permanently_set_uid: 22/22 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: server->client aes128-ctr hmac-md5 none [preauth]
debug1: kex: client->server aes128-ctr hmac-md5 none [preauth]
Unsupported hostkey type 67207904 [preauth]
debug1: do_cleanup [preauth]
debug1: monitor_read_log: child log fd closed
debug1: do_cleanup
debug1: Killing privsep child 43734

Here is an example of the client side:
[rec at porter ~/map/tiger]$ ssh -p 44 -vvv rec at babbage
OpenSSH_6.6.1p1, OpenSSL 1.0.1j-freebsd 15 Oct 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug3: ciphers ok:
[aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: macs ok: [hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160]
debug3: key names ok: [ssh-rsa,ssh-dss]
debug2: ssh_connect: needpriv 0
debug1: Connecting to babbage [10.0.5.14] port 44.
debug1: Connection established.
debug1: identity file /home/rec/.ssh/id_rsa type -1
debug1: identity file /home/rec/.ssh/id_rsa-cert type -1
debug1: identity file /home/rec/.ssh/id_dsa type -1
debug1: identity file /home/rec/.ssh/id_dsa-cert type -1
debug1: identity file /home/rec/.ssh/id_ecdsa type -1
debug1: identity file /home/rec/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/rec/.ssh/id_ed25519 type -1
debug1: identity file /home/rec/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1_hpn13v11 FreeBSD-20140420
debug1: Remote protocol version 2.0, remote software version
OpenSSH_6.4_hpn13v11 FreeBSD-20131111
debug1: match: OpenSSH_6.4_hpn13v11 FreeBSD-20131111 pat OpenSSH* compat
0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit:
curve25519-sha256 at libssh.org,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
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160
debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib at 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:
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,arcfour256,arcfour128,aes128-gcm at openssh.com,aes256-gcm at openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm at openssh.com,aes256-gcm at openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-ripemd160-etm at openssh.com,hmac-sha1-96-etm at openssh.com,hmac-md5-96-etm at openssh.com,hmac-md5,hmac-sha1,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib at openssh.com
debug2: kex_parse_kexinit: none,zlib at 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: setup hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: setup hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by 10.0.5.14

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