Windows 2019
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OpenSSH : SSH Key-Pair Authentication
2019/02/13
 
Configure SSH Key-Pair Authentication.
[1]
By default setting of OpenSSH on Windows, only [Administrators] group is configured as that [authorized_keys] file is not the default location of OpenSSH like follows, but if you'd like to set it on default location for all users, it needs to comment out these 2 lines.
⇒ Conf file [C:\ProgramData\ssh\sshd_config]
[2]
Logon with any user you'd like to set SSH key-pair.
Run [ssh-keygen] command to generate SSH key-pair.
PS > ssh-keygen
[3]
Move to [.ssh] folder and rename puiblic-key file to [authorized_keys].
PS > cd .ssh
PS > mv id_rsa.pub authorized_keys
[4]
Change Security setting for [authorized_keys] file.
Because Everyone:(RX) is added to the file by default, but it prevents SSH key-pair authentication normally, so remove the right.
PS > icacls authorized_keys /remove Everyone
That's OK all for Server side settings. Move to Client side Host.
[5]
Logon with any user you'd like to set SSH secret key on Client Host and run PowerShell or Command prompt.
Next, create [.ssh] folder under the Home Folder of the user, and next, transfer secret key under [.ssh] folder like follows.
PS > mkdir .ssh
PS > cd .ssh
PS > sftp (username)@(SSH server's Hostname or IP address)
sftp > cd .ssh
sftp > get id_rsa
sftp > exit
[6]
That's OK. Make sure possible login with key-pair authentication.
PS > ssh (username)@(SSH server's Hostname or IP address)
[7] If transfer secret key on Linux Host, it's also possbile to connect from Linux Host to Windows Host with SSH key-pair auth.
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