Windows
Windows OpenSSH has specific requirements for managing administrator SSH keys that differ from standard Unix-like systems. Administrator accounts cannot use the conventional .ssh/authorized_keys file in the user’s home directory. Instead, Windows OpenSSH requires all administrator SSH keys to be stored in C:\ProgramData\ssh\administrators_authorized_keys. This centralized location is mandatory for administrative access and is where the OpenSSH service looks for valid keys when authenticating administrator accounts.
Key Storage and Permissions
The administrators_authorized_keys file must be carefully configured with appropriate permissions to function correctly. Unlike standard user SSH keys, this file is world-readable by default and requires specific NTFS permissions to restrict access appropriately. The file should be owned by the system and only readable by administrators and the OpenSSH service account to prevent unauthorized key injection.
Standard User SSH Keys
Standard (non-administrator) user accounts on Windows OpenSSH follow more conventional practices. These users can store their authorized keys in the .ssh/authorized_keys file with standard permissions.
GNU Coreutils Integration
Recent developments allow for native Linux command-line utilities directly within the Windows environment:
- Native Binaries: GNU Core Utilities (coreutils) have been officially ported to Windows as native binaries, eliminating reliance on WSL or Cygwin for basic utility functions in Command Prompt.
- Source Context: This development highlights a shift toward natively supporting Unix-like workflows in standard Windows terminals without subsystem dependencies Coreutils for Windows: Native Linux Commands in Command Prompt.