[FSUG PD] forward di ssh in x con xauth

[alex]

questo pomeriggio mi si chiese una configurazione di ssh che gestisca il 
forward di X in oggetto. Eccola:

per ssh_config:

Host *
    ForwardAgent yes
    ForwardX11 no
    ForwardX11Trusted yes
#   RhostsRSAAuthentication no
#   RSAAuthentication yes
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
    IdentityFile ~/.ssh/id_dsa
    Port 22
    Protocol 2
#   Cipher 3des
#   Ciphers 
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
    SendEnv LANG LC_*
    HashKnownHosts yes
#HashKnownHosts no
#GSSAPIAuthentication yes
#GSSAPIDelegateCredentials no

************************************
per sshd_conf:

# What ports, IPs and protocols we listen for
Port 22

Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 600
PermitRootLogin yes
#StrictModes yes

#RSAAuthentication yes
PubkeyAuthentication yes

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



# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

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

# Change to yes to enable tunnelled clear text passwords
PasswordAuthentication no

# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no

# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes


X11Forwarding yes
AllowTcpForwarding yes

X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
KeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

Subsystem sftp /usr/lib/openssh/sftp-server

UsePAM yes

***********************

un altro file dev'esser modificato:

in /etc/X11/xinit/xserverrc

dev'esser tolto:

 -nolisten tcp




A.

p.s.: il tutto da per scontato diverse cose, in primis che vi aggrada la 
configurazione di ssh che ho scelto, a parer mio abbastanza sicura, a 
parer di altri forse paranoica, altri potrebbero giudicarla follemente 
aperta :)

p.p.s.: do anche per scontata una configurazione di base di ssh. Se 
qualcuno volesse una mano faccia un fischio.

p.p.p..s.: in realta' questa non e' la mia configurazione di default, pero' 
mi sono preso la briga di testarla e funziona bene.