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2fa [2024/05/03 17:28] – -formatting hogwild2fa [2024/05/03 18:40] (current) – hogwild
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-====== Setting up 2FA for SSH using GoogleAuthenticator ======+====== Setting up 2FA for SSH using Google Authenticator ======
  
-This is content taken from the following forum thread: \\ [[https://www.linksysinfo.org/index.php?threads/howto-set-up-2fa-openssh-with-google-authenticator.78183/#post-345032]]+This content was taken from the following forum thread: \\ [[https://www.linksysinfo.org/index.php?threads/howto-set-up-2fa-openssh-with-google-authenticator.78183/#post-345032]]
  
-These are simple configuration notes. These notes are not intended to be a complete HOWTO.+ \\ 
 + 
 +These are simple configuration notes and thus not intended to be a complete HOWTO.
  
 This setup uses openssh with google-authenticator as 2-Factor Authentication. Only the root user is supported. This setup uses openssh with google-authenticator as 2-Factor Authentication. Only the root user is supported.
- 
-Prerequisites : Install/setup entware. This is not covered here. <Link?> \\ 
  
  \\  \\
 +
 +Prerequisite: Install/setup entware if it's not already installed. This is not covered here. <Link?> \\
 +
 + \\ Next, install openssh-server and google-authenticator:
  
     opkg install openssh-server-pam google-authenticator-libpam     opkg install openssh-server-pam google-authenticator-libpam
  
-(hopefully this will cover all dependencies) - enable openssh server (not covered here) \\+Hopefully, this will include all dependencies. \\
  
  \\  \\
  
-Now configure the correct settings in /opt/etc/init.d/S39pre_ssh : \\+Next, enable openssh-server . This is not covered here. <Link?> \\  \\
  
- \\+Next, configure the correct settings in configuration file /opt/etc/init.d/S39pre_ssh : \\  \\
  
     #!/bin/sh     #!/bin/sh
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 The new service must be enabled at boot time as well: The new service must be enabled at boot time as well:
  
-/opt/etc/ssh/sshd_config (only what's changed from the default - I believe)+ \\ 
 + 
 +Next, run /opt/etc/ssh/sshd_config and change the following from the defaults:
  
     Port 2222 # to be changed if desired     Port 2222 # to be changed if desired
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     HostKey /opt/etc/ssh/ssh_host_rsa_key     HostKey /opt/etc/ssh/ssh_host_rsa_key
     HostKey /opt/etc/ssh/ssh_host_ed25519_key     HostKey /opt/etc/ssh/ssh_host_ed25519_key
 +
 + \\
  
 grep -v "#" /opt/etc/pam.d/sshd grep -v "#" /opt/etc/pam.d/sshd
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     password include common-password     password include common-password
  
-now run the google-auth setup and it will guide you on the steps:+ \\ 
 + 
 +Now, run google-auth setup and follow the steps:
  
     google-authenticator     google-authenticator
  
-make sure you register the TOTP code or load into an app like AndOTP now it's time to move its config file to /opt/etc+Remember to register the TOTP code, or load into an app such as AndOTP. 
 + 
 + \\ 
 + 
 +Next, move its config file (.google_authenticator) to the /opt/etc directory:
  
     mv .google_authenticator /opt/etc/     mv .google_authenticator /opt/etc/
  
-make sure the permission of the file are 0600 (very important)+ \\ 
 + 
 +Next, Verify the permissions on the file are 0600 . This is very important.
  
     chmod 0600 /opt/etc/.google_authenticator     chmod 0600 /opt/etc/.google_authenticator
  
-now if memory serves me well you can start the sshd service:+ \\ 
 + 
 +Now, you should be able to start the sshd service:
  
     /opt/etc/init.d/S40sshd start     /opt/etc/init.d/S40sshd start
  
-and test it from the LAN side:+ \\
  
-    ssh -p 2222 root@<lan-ip-of-tomato-router>+Next, test the configuration from the LAN side by typing the following at the command prompt:
  
-and you should be greeted by:+    ssh -p 2222 root@<lan-ip-of-freshtomato-router> 
 + 
 +You should see the following:
  
     The authenticity of host '[192.168.1.1]:2222 ([192.168.1.1]:2222)' can't be established.     The authenticity of host '[192.168.1.1]:2222 ([192.168.1.1]:2222)' can't be established.
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     Are you sure you want to continue connecting (yes/no/[fingerprint])? yes     Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
  
-and now the most important part+ \\ 
 + 
 +After typing Yes, you should see the following:
  
     Keyboard-interactive authentication prompts from server:     Keyboard-interactive authentication prompts from server:
     | Verification code:     | Verification code:
  
-that means that only 2FA authentication is working+If you see this, it means that 2FA is the only authentication operating.
  
-you can how expose port 2222 (or the one you configured) to the internet (not covered here)+ \\
  
-@Moderators - please edit/move this post as needed+You can now expose port 2222 (or the port you configured) to the Internet (not covered here). 
 + 
 + \\ 
 + 
 + \\
  
 PS - /opt/etc/environment is the default - only comments - so nothing to change - maybe a "touch /etc/environment" should have been enough PS - /opt/etc/environment is the default - only comments - so nothing to change - maybe a "touch /etc/environment" should have been enough
  
  
2fa.1714753722.txt.gz · Last modified: 2024/05/03 17:28 by hogwild

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