SSH

Permissions

Authorize root login

1. Open sshd_config

   sudo nano /etc/ssh/sshd_config

2. Modify these lines

   # Authentication:
   #LoginGraceTime 2m
   PermitRootLogin yes
   #StrictModes yes
   #MaxAuthTries 6
   #MaxSessions 10

3. Restart the server

   sudo systemctl restart sshd

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Clés SSH

1. Générer clé

   ssh-keygen

2. Copier clé sur serveur distant

   ssh-copy-id [user]@[ip]

3. Tester connexion sans mot de passe

   ssh [user]@[ip]

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Specify a ssh key

	ssh -i <key> <user>@<ip>

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Log SSH

See all logs

sudo grep 'sshd' /var/log/auth.log

Show login attempts

sudo lastb -F

Show failed password attempts

sudo grep 'Failed password' /var/log/auth.log

Show success password attempts

sudo grep 'Accepted password' /var/log/auth.log