Ssh

FAQ

remember key passphrase

ssh-agent bash
ssh-add ~/.ssh/id_rsa

root access from single host

Match Address 192.168.1.100
       PermitRootLogin yes

multihop tunnel

ssh -A -t -l user jump-host \
-L 8080:localhost:8080 \
ssh -A -t -l user webserver.dmz \
-L 8080:localhost:8080

SSH tunnel with putty

https://www.skyverge.com/blog/how-to-set-up-an-ssh-tunnel-with-putty/

Failed publickey

• acccess rights?

14: No supported authentication methods available [preauth]

Putty not configured to look at correct private key?

chrooted sftp

Homedir as defined in /etc/passwd /home/someuser

chmod 755 /home/someuser

And then create writable dir for user:

mkdir /home/someuser/downloads
chown someuser.someuser /home/someuser/downloads

Subsystem sftp internal-sftp

Per group:

/etc/ssh/sshd_config

 Match Group sftponly
   ChrootDirectory %h
   ForceCommand internal-sftp
   AllowTcpForwarding no
   PermitTunnel no
   X11Forwarding no

 #Remember this one to close Match block!
 Match all

Per user:

 Match User username
   ChrootDirectory %h
   ForceCommand internal-sftp
   AllowTcpForwarding no
   PermitTunnel no
   X11Forwarding no
 #Remember this one to close Match block!
 Match all

The ChrootDirectory must be owned by root.root with permissons 755. If you want group based access rights, you can do that in subdirectories.

ssh tunnel

ssh -L 1234:192.168.100.2:80 remotehost

And then connect to localhost:1234

Unable to negotiate with 192.168.100.4 port 22: no matching cipher found.

passing old cipher, like -o arcfour??