Example Dockerfile for SSH Server on Windows Server Core

dockerfile

FROM microsoft/windowsservercore:1709

# Install Powershell
ADD https://github.com/PowerShell/PowerShell/releases/download/v6.0.0/PowerShell-6.0.0-win-x64.zip c:/powershell.zip
RUN powershell.exe -Command Expand-Archive c:/powershell.zip c:/PS6 ; Remove-Item c:/powershell.zip
RUN C:/PS6/pwsh.EXE -Command C:/PS6/Install-PowerShellRemoting.ps1

# Install SSH
ADD https://github.com/PowerShell/Win32-OpenSSH/releases/download/0.0.24.0/OpenSSH-Win64.zip c:/openssh.zip
RUN c:/PS6/pwsh.exe -Command Expand-Archive c:/openssh.zip c:/ ; Remove-Item c:/openssh.zip
RUN c:/PS6/pwsh.exe -Command c:/OpenSSH-Win64/Install-SSHd.ps1

# Configure SSH
COPY sshd_config c:/OpenSSH-Win64/sshd_config
COPY sshd_banner c:/OpenSSH-Win64/sshd_banner
WORKDIR c:/OpenSSH-Win64/
# Don't use powershell as -f paramtere causes problems.
RUN c:/OpenSSH-Win64/ssh-keygen.exe -t dsa -N "" -f ssh_host_dsa_key && \
    c:/OpenSSH-Win64/ssh-keygen.exe -t rsa -N "" -f ssh_host_rsa_key && \
    c:/OpenSSH-Win64/ssh-keygen.exe -t ecdsa -N "" -f ssh_host_ecdsa_key && \
    c:/OpenSSH-Win64/ssh-keygen.exe -t ed25519 -N "" -f ssh_host_ed25519_key

# Create a user to login, as containeradministrator password is unknown
RUN net USER ssh "Passw0rd" /ADD && net localgroup "Administrators" "ssh" /ADD

# Set PS6 as default shell
RUN C:/PS6/pwsh.EXE -Command \
    New-Item -Path HKLM:\SOFTWARE -Name OpenSSH -Force; \
    New-ItemProperty -Path HKLM:\SOFTWARE\OpenSSH -Name DefaultShell -Value c:\ps6\pwsh.exe -PropertyType string -Force ; 

RUN C:/PS6/pwsh.EXE -Command \
    ./Install-sshd.ps1; \
    ./FixHostFilePermissions.ps1 -Confirm:$false;

EXPOSE 22
# For some reason SSH stops after build. So start it again when container runs.
CMD [ "c:/ps6/pwsh.exe", "-NoExit", "-Command", "Start-Service" ,"sshd" ]

sshd_banner

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=============================================================================================

* login as ssh / Passw0rd

sshd_config

Port 22

Protocol 2

LogLevel DEBUG

# Authentication:

#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile      .ssh/authorized_keys

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords yes

Banner sshd_banner

Subsystem       sftp    sftp-server.exe

hostkeyagent \\.\pipe\openssh-ssh-agent