# Step 1: Ensure OpenSSH Server is Installed
sudo apt update
sudo apt install openssh-server
# Step 2: Edit the SSH Configuration File
sudo nano /etc/ssh/sshd_config
# Ensure the following lines are present and uncommented:
# PasswordAuthentication yes
# UsePAM yes
# Ensure these lines are either commented out or set correctly:
# ChallengeResponseAuthentication no
# KbdInteractiveAuthentication no
# Save the file and exit (Ctrl + X, then Y, and Enter)
Also
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I realized that a file /etc/ssh/sshd_config.d/50-cloud-init.conf was being referenced in my /etc/ssh/sshd_config, via the following line:
Include /etc/ssh/sshd_config.d/*.conf
this 50-cloud-init.conf file contained the line:
PasswordAuthentication yes
I changed the line to:
#PasswordAuthentication yes
and i restarted the ssh.
Now it is working, I can access only with the ssh key.
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# Step 3: Restart the SSH Service
sudo systemctl restart ssh
# Step 4: Verify SSH Service Status
sudo systemctl status ssh
# Step 5: Check PAM Configuration
sudo nano /etc/pam.d/sshd
# Ensure it includes the following lines:
# auth required pam_unix.so
# account required pam_unix.so
# password required pam_unix.so
# session required pam_unix.so
# Save the file and exit (Ctrl + X, then Y, and Enter)
# Step 6: Check User Account and Permissions
sudo passwd -u username # Replace 'username' with the actual username
# Step 7: Test SSH Connection Locally
ssh username@localhost # Replace 'username' with the actual username
# Step 8: Examine SSH Logs
sudo tail -f /var/log/auth.log
# Step 9: Check SELinux/AppArmor
# For SELinux:
sudo setenforce 0
# For AppArmor:
sudo aa-status
sudo systemctl stop apparmor
sudo systemctl disable apparmor
# Step 10: Ensure No Conflicting Settings in sshd_config
sudo nano /etc/ssh/sshd_config
# Check for match blocks:
# Match User anoncvs
# PasswordAuthentication no
# Ensure such blocks do not affect the user you are trying to log in with.
# Save the file and exit (Ctrl + X, then Y, and Enter)
# Step 11: Check SSHD Configuration Syntax
sudo sshd -t
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