Re: [gentoo-user] openssh-7.1_p1-r2 won't allow "nxserver" to connect

[thelma@sys-concept.com]

On 11/14/2015 02:22 PM, Neil Bothwick wrote:
> On Sat, 14 Nov 2015 08:54:38 -0700, thelma@sys-concept.com wrote:
> 
>> The only software that uses ssh-dss key and I need is nxserver.
>>
>> I just added a line to my: sshd_config
>> PubkeyAcceptedKeyTypes=+ssh-dss
> 
> You should add this to a Host section, so it only enables the wek
> encryption for that host.
> 
>> restarted "sshd and nxserver" but I nxserver still doesn't work,
>> running:  nxsetup --test (I get):
>>
>> ----> Testing your nxserver connection ...  
>> Permission denied (publickey,password,keyboard-interactive).
>> Fatal error: Could not connect to NX Server.
> 
> That doesn't look like the error you get from an unsupported key, which
> is something like
> 
> Unable to negotiate with x.x.x.x: no matching host key type found. Their offer: ssh-dss
> 
> Is nxserver trying to connect as root? It looks more like the disabling
> of passworded root logins in OpenSSH.



Here is my sshd_config: (nxserver works with openssh-6.9_p1-r2)
As soon as I upgrade to openssh-7, enable:
PubkeyAcceptedKeyTypes=+ssh-dss

restart: sshd
and nxserver gives me an error message (like above).

Yes, I'm running "nxsetup --test" as root.

#	$OpenBSD: sshd_config,v 1.95 2015/04/27 21:42:48 djm Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# The default requires explicit activation of protocol 1
#Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Ciphers and keying
#RekeyLimit default none

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin no
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and
.ssh/authorized_keys2
# but this is overridden so installations will only check
.ssh/authorized_keys
#AuthorizedKeysFile	.ssh/authorized_keys

# Added Nov 14/15, needed for nxserver to work
# PubkeyAcceptedKeyTypes=+ssh-dss

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
#PermitEmptyPasswords no

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
PrintLastLog no
#TCPKeepAlive yes
#UseLogin no
UsePrivilegeSeparation sandbox		# Default for new installations.
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# here are the new patched ldap related tokens
# entries in your LDAP must have posixAccount & ldapPublicKey objectclass
#UseLPK yes
#LpkLdapConf /etc/ldap.conf
#LpkServers  ldap://10.1.7.1/ ldap://10.1.7.2/
#LpkUserDN   ou=users,dc=phear,dc=org
#LpkGroupDN  ou=groups,dc=phear,dc=org
#LpkBindDN cn=Manager,dc=phear,dc=org
#LpkBindPw secret
#LpkServerGroup mail
#LpkFilter (hostAccess=master.phear.org)
#LpkForceTLS no
#LpkSearchTimelimit 3
#LpkBindTimelimit 3
#LpkPubKeyAttr sshPublicKey

# override default of no subsystems
Subsystem	sftp	/usr/lib64/misc/sftp-server

# the following are HPN related configuration options
# tcp receive buffer polling. disable in non autotuning kernels
#TcpRcvBufPoll yes

# disable hpn performance boosts
#HPNDisabled no

# buffer size for hpn to non-hpn connections
#HPNBufferSize 2048


# allow the use of the none cipher
#NoneEnabled no

# Example of overriding settings on a per-user basis
#Match User anoncvs
#	X11Forwarding no
#	AllowTcpForwarding no
#	PermitTTY no
#	ForceCommand cvs server

# Allow client to pass locale environment variables #367017
AcceptEnv LANG LC_*

--
Thelma