OpenSSH utility scripts to fix file permissions

Powershell utility scripts are included starting release V0.0.15.0 to automatically fix the permissions on various keys and configuration files for host and user. Secure protection of various files explains why secure enforcement is needed.

• FixHostFilePermissions.ps1: checks and fixes the below permissions on default host files:
  • user's authorized_keys located at $env:systemdrive\Users\...\.ssh\authorized_keys
  • host keys generated by ssh-keygen.exe -A in the same folder of the script
  • sshd_config in the same folder of the script

# script prompt to confirm you want to update each permission if Quiet is not specified
.\FixHostFilePermissions.ps1

• FixUserFilePermissions.ps1: checks and fixes the below file permissions for user's default files:
  • user's ssh_config located at ~\.ssh\config
  • user's keys located at ~\.ssh\id_rsa, ~\.ssh\id_rsa.pub
  • user's keys located at ~\.ssh\id_dsa, ~\.ssh\id_dsa.pub

# -Quiet suppresses prompting to confirm you want to update each permission
.\FixUserFilePermissions.ps1 -Quiet 

• Powershell module OpenSSHUtils.psm1 checks and fixes customer specified files.
  • Function Fix-HostSSHDConfigPermissions fixes the sshd_config file specified by user
  • Function Fix-HostKeyPermissions fixes the permission for host keys specified by user; Note that to keep the host private keys secure, it is recommended to register them with ssh-agent following steps in link, but this function makes sure 'NT Service\sshd' has Read permission to the host keys for now in case they are not registered yet.
  • Function Fix-UserKeyPermissions fixes the the permissions for user's key files specified by user
  • Function Fix-AuthorizedKeyPermissions fixes the permissions for the authorized_keys file specified by user
  • Function Fix-UserSSHConfigPermissions fixes the permissions for user's ssh config specified by user

Import-Module .\OpenSSHUtils.psm1 -Force
# prompt to confirm you want to confirm you want to update each permission on the file
Fix-HostSSHDConfigPermissions c:\test\sshd_config
# -Quiet suppresses prompting to confirm you want to update each permission on the file
Fix-AuthorizedKeyPermissions -FilePath C:\Users\sshtest_ssouser\.ssh\authorized_keys -Quiet
Fix-HostKeyPermissions -FilePath c:\test\sshtest_hostkey_ecdsa -Quiet
Fix-HostUserPermissions -FilePath c:\test\sshtest_userssokey_ed25519 -Quiet
Fix-UserSSHConfigPermissions -FilePath '~\.ssh\config' -Quiet