Configure ssh for passwordless login

1. Make sure you have a public/private key pair on your host machine (or generate
it: sh-keygen -t rsa -b 4096 -C “”)

2. Copy your public key to your nas:
ssh-copy-id you@yournassip (if ssh-copy-id is available)

Or append home/.ssh/ from your host to the .ssh/authorized_keys on
the nas.

3. Make sure permissions are correct (or your key will be refused)
– authorized_keys: 644
– .ssh: 700
– home directory (important !): 755

4. Autorize public key login in sshd config: /etc/ssh/sshd_config
RSAAuthentication yes
PubKeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

5. Restart sshd with synoservice –restart ssh-shell

5. Connect without a password: ssh you@yournas

To debug, connect with ssh -v you@yournas, and change the following in
SysLogFacility AUTH
LogLevel VERBOSE (should be enough most of the time, or DEBUG)
Read logs in (FIXME???)

If you break ssh and can’t connect anymore, activate the telnet service in
dsm and fix sshd_config.

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