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2fa [2024/05/03 18:09] – -formatting, condense hogwild2fa [2025/08/13 04:51] (current) – -Change to: "The default file location is /opt/etc/environment" hogwild
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 ====== Setting up 2FA for SSH using Google Authenticator ====== ====== Setting up 2FA for SSH using Google Authenticator ======
  
-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]]+This content was taken from a Tomato forum thread: [[https://www.linksysinfo.org/index.php?threads/howto-set-up-2fa-openssh-with-google-authenticator.78183/#post-345032|HOWTO - Set up 2FA openssh with google authenticator]] . 
 + 
 +These are simple configuration notes, and not intended to be a complete HOWTO. This setup uses openssh with google-authenticator as 2-Factor Authentication. Only the "root" user is supported.\\   \\   \\ **Prerequisites:** Install/setup entware if it isn't already installed. This is not covered here.\\  \\ 
 + 
 +Install openssh-server and google-authenticator:
  
  \\  \\
  
-These are simple configuration notes and thus not intended to be a complete HOWTO. +    opkg install openssh-server-pam google-authenticator-libpam
- +
-This setup uses openssh with google-authenticator as 2-Factor Authentication. Only the root user is supported.+
  
  \\  \\
  
-Prerequisite: Install/setup entware. This is not covered here. <Link?> \\+If this completes without all dependencies, make sure to install any necessary ones.\\
  
- \\ First, install openssh-server and google-authenticator:+ \\  \\
  
-    opkg install openssh-server-pam google-authenticator-libpam+Next, enable openssh-server . This is not covered here.
  
-Hopefully, this will include all dependencies. \\+ \\ \\ Configure the correct settings in configuration file /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. Make the following changes to the file: "/opt/etc/ssh/sshd_config:
  
-/opt/etc/ssh/sshd_config (most likely only what's changed from the default)+ \\
  
     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
 +
 + \\
  
     auth required pam_env.so     auth required pam_env.so
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  \\  \\
  
-Now, run the google-auth setup and go through the steps:+ \\ 
 + 
 +Now, run google-auth setup and follow the steps: 
 + 
 + \\
  
     google-authenticator     google-authenticator
 +
 + \\
  
 Remember to register the TOTP code, or load into an app such as AndOTP. Remember to register the TOTP code, or load into an app such as AndOTP.
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  \\  \\
  
-Now, move its config file to the /opt/etc directory:+ \\ 
 + 
 +Next, move its config file (.google_authenticator) to the /opt/etc directory: 
 + 
 + \\
  
     mv .google_authenticator /opt/etc/     mv .google_authenticator /opt/etc/
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  \\  \\
  
-Verify the permissions on the file are 0600 . This is 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
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  \\  \\
  
-Now you should be able to 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
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  \\  \\
  
-Now, test it from the LAN side:+ \\ Next, test the configuration from the LAN side by typing the following at the command prompt:
  
-    ssh -p 2222 root@<lan-ip-of-tomato-router>+ \\
  
-The following text should be output:+    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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  \\  \\
  
-Now, you should see the following:+After typing Yes, you should see the following: 
 + 
 + \\
  
     Keyboard-interactive authentication prompts from server:     Keyboard-interactive authentication prompts from server:
     | Verification code:     | Verification code:
  
-If you see this, it means that only 2FA authentication is working.+ \\ If you see this, it means that 2FA is the only authentication operating. You can now expose port 2222 (or your configured port) to the Internet. .
  
  \\  \\
  
-You can now expose port 2222 (or the port you configured) to the Iinternet (not covered here).+The default file location is: "/opt/etc/environment"
  
  \\  \\
  
  \\  \\
- 
-PS - /opt/etc/environment is the default - only comments - so nothing to change - maybe a "touch /etc/environment" should have been enough 
  
  
2fa.1714756179.txt.gz · Last modified: by hogwild

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