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ubuntu:ssh

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ubuntu:ssh [2019/12/05 01:14] – peterubuntu:ssh [2025/05/21 09:50] (current) – peter
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 ====== SSH ====== ====== SSH ======
  
-===== OpenSSH =====+SSH, or Secure Shell, enables users to connect to a remote server securely.
  
-OpenSSH is the implementation of the SSH protocol on Ubuntu.+  * the main advantage is server authentication, through the use of public key cryptography.
  
-OpenSSH is recommended for remote login, making backups, remote file transfer via scp or sftp, and much more. SSH is perfect to keep confidentiality and integrity for data exchanged between two networks and systems.+Here are a few things you need to tweak in order to improve SSH server security.
  
-However, the main advantage is server authentication, through the use of public key cryptography. +<WRAP important> 
- +**IMPORTANT:**  Before making any modifications to the **/etc/sshd_config** file, make a backup by:
-Here are a few things you need to tweak in order to improve OpenSSH server security: +
- +
-Before making any modifications to the **/etc/sshd_config** file, make a backup by:+
  
 <code bash> <code bash>
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 sudo chmod a-w /etc/ssh/sshd_config.factory-defaults sudo chmod a-w /etc/ssh/sshd_config.factory-defaults
 </code> </code>
 +</WRAP>
  
-**NOTE**: Not all of the possible changes mentioned below have to be made. Some changes are not recommended to be made but may offer tighter security depending on your requirements. +<WRAP info> 
 +**NOTE**: Not all of the possible changes mentioned below have to be made. 
 + 
 +Some changes are not recommended to be made but may offer tighter security depending on your requirements.  
 +</WRAP>
  
 ---- ----
 +
 +[[Ubuntu:SSH:Agent forwarding|Agent forwarding]]
  
 [[Ubuntu:SSH:Blacklist a public key|Blacklist a public key]] [[Ubuntu:SSH:Blacklist a public key|Blacklist a public key]]
 +
 +[[Ubuntu:SSH:Change the Port|Change the Port]]
  
 [[Ubuntu:SSH:Check the Current SSH Ports|Check the Current SSH Ports]] [[Ubuntu:SSH:Check the Current SSH Ports|Check the Current SSH Ports]]
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 [[Ubuntu:SSH:Configuring sshd|Configuring sshd]] [[Ubuntu:SSH:Configuring sshd|Configuring sshd]]
 +
 +[[Ubuntu:SSH:Creating public/private key authentication for SSH|Creating public/private key authentication for SSH]]
 +
 +[[Ubuntu:SSH:Disable SSH root login|Disable SSH root login]]
  
 [[Ubuntu:SSH:Disabling sshd|Disabling sshd]] [[Ubuntu:SSH:Disabling sshd|Disabling sshd]]
  
 [[Ubuntu:SSH:Distribute public keys|Distribute public keys]] [[Ubuntu:SSH:Distribute public keys|Distribute public keys]]
 +
 +[[Ubuntu:SSH:ERROR - SSH Connection Refused|ERROR - SSH Connection Refused]]
  
 [[Ubuntu:SSH:Get the host's fingerprint|Get the host's fingerprint]] [[Ubuntu:SSH:Get the host's fingerprint|Get the host's fingerprint]]
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 [[Ubuntu:SSH:Override socket-activated SSH|Override socket-activated SSH]] [[Ubuntu:SSH:Override socket-activated SSH|Override socket-activated SSH]]
 +
 +[[Ubuntu:SSH:Port Forwarding|Port Forwarding]]
  
 [[Ubuntu:SSH:Restart SSH|Restart SSH]] [[Ubuntu:SSH:Restart SSH|Restart SSH]]
  
 [[Ubuntu:SSH:Setup SSH Keys|Setup SSH Keys]] [[Ubuntu:SSH:Setup SSH Keys|Setup SSH Keys]]
 +
 +[[Ubuntu:SSH:SSH Login Message|SSH Login Message]]
  
 [[Ubuntu:SSH:Test mode|Test mode]] [[Ubuntu:SSH:Test mode|Test mode]]
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 [[Ubuntu:SSH:Troubleshooting SSH|Troubleshooting SSH]] [[Ubuntu:SSH:Troubleshooting SSH|Troubleshooting SSH]]
  
 +[[Ubuntu:SSH:Two-Factor Authentication (using Google Authenticator)|Two-Factor Authentication (using Google Authenticator)]]
 +
 +[[Ubuntu:SSH:Use SSH without a password|Use SSH without a password]]
  
ubuntu/ssh.1575508468.txt.gz · Last modified: 2020/07/15 09:30 (external edit)
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