0

i have some Linux installed on by Laptop and use SSH with private key authentication to connect to a server. Recently, I installed Win10 with the bash developer extension on by desktop. Since I only have one user account on this server, and hence only on key, i simply moved by private key file into the respective directory of my windows bash.

However, whenever I open a new bash instance and try to connect to the server, the error message: 'Permission denied (publickey).' is returned. My current fix are the following steps: exec ssh-agent bash; ssh-add;

While I could obviously add this into .profile, I would be required to enter the passphrase whenever I open bash.

Does anyone has some suggestions how to fix this more properly, s.t. I only have to enter my passphrase whenever I connect to the server and that I do not have to reinitialize my ssh key in every bash session.

kind regards

  • My understanding is that the type of authentication that the beta feature supports is limited. Are you sure your key is supported? – Ramhound Jan 10 '18 at 13:02
  • how can i check whether the type is supported? However, by manually starting the ssh-agent, everything works more or less as expected... – hansal Jan 12 '18 at 19:18
  • @hansal See: ssh(1). You can use ssh -Q followed by one of the following: cipher | cipher-auth | mac | kex | key | key-cert | key-plain | protocol-version – JW0914 Jun 20 '18 at 1:08
0

Keys must only be accessible to the user they're intended for and no other account, service, or group.

  • I don't use WSL, as it's a security nightmare, creating more problems than it solves, so I'll provide both ways to set correct permissions


Windows Powershell Terminal


  • GUI:
    • [File] Properties - Security - Advanced
      1. Set Owner to the key's user
      2. Remove all users, groups, and services, except for the key's user, under Permission Entries
      3. Set key's user to Full Control


  • CLI:

    :: Set Variable ::
    set key="C:\Path\to\key"
    
    :: Remove Inheritance ::
    cmd /c icacls %key% /c /t /inheritance:d
    
    :: Set Ownership to Owner ::
    cmd /c icacls %key% /c /t /grant %username%:F
    
    :: Remove All Users, except for Owner ::
    cmd /c icacls %key%  /c /t /remove Administrator BUILTIN\Administrators BUILTIN Everyone System Users
    
    :: Verify ::
    cmd /c icacls %key%
    


WSL Bash Terminal


  • CLI

    # Set Variables
    
      # Key  
        key="/path/to/key"
    
      # User:
        user="$(echo $USER)"
    
    # Set Ownership
      # This assumes user's name is also user's group name
        chown $user:$user $key
    
    # Set Access Rights
      chmod 0600 $key
    
    # Verify
    ls -l $key
    

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.