permit root login prohibit password
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PermitRootLogin. Specifies whether root can log in using ssh (1). The argument must be yes, prohibit-password, forced-commands-only, or no. The default is prohibit-password. If this option is set to prohibit-password (or its deprecated alias, without-password), password and keyboard-interactive authentication are disabled for root.
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The argument must be yes, prohibit–password, without-password, forced-commands-only, or no. The default is prohibit–password. If this option is set to prohibit–password or without-password, password and keyboard-interactive authentication are disabled for root.
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The OpenSSH server uses the PermitRootLogin configuration setting in the /etc/ssh/sshd_config configuration file to allow or prohibit users logging in to the system as root. With the PermitRootLogin parameter to yes, as it is by default, people are permitted to log in as root.
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So you could use PermitRootLogin without-password for allowing private/public key authentication while disallowing password authentication; or maybe PermitRootLogin forced-commands-only to let you login as root but without interactive access.
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Change the “PermitRootLogin” line so that it uses the “prohibit–password” option. Save your changes and restart the SSH daemon. sudo systemctl restart ssh. Now, even if someone reinstates the root user’s password, they will not be able to log in over SSH using a password.
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PermitRootLogin. Specifies whether root can log in using ssh (1). The argument must be “yes”, “without-password”, “forced-commands-only”, or “no”.
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Use the value no to disable all logins with root privileges: PermitRootLogin no. With the value nopwd root logins are allowed only when an authentication method other than password is used: PermitRootLogin nopwd. It is also possible to create a separate subconfiguration file for root.
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#PermitRootLogin prohibit–password. TO: PermitRootLogin yes. The quick way to do this job could be just to simply use the sed command as shown below: $ sudo sed -i ‘s/#PermitRootLogin prohibit-password/PermitRootLogin yes/’ /etc/ssh/sshd_config. Restart SSH service: $ sudo systemctl restart ssh.
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Root doesn’t have a password nor a pub key. (Empty passwords are not permitted by default.) Thus, no authentication method will succeed for root and root login is effectively disabled.
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