111 lines
4.0 KiB
PowerShell
111 lines
4.0 KiB
PowerShell
# The MIT License
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#
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# Copyright (c) 2019-2020, Alex Earl
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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# Usage:
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# docker run jenkins/ssh-agent <public key>
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# or
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# docker run -e "JENKINS_AGENT_SSH_PUBKEY=<public key>" jenkins/ssh-agent
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# or
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# docker run -e "JENKINS_AGENT_SSH_PUBKEY=<public key>" -e "JENKINS_AGENT_SSH_KNOWNHOST_0=<known host entry>" -e "JENKINS_AGENT_SSH_KNOWNHOST_n=<known host entry>" jenkins/ssh-agent
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[CmdletBinding()]
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Param(
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[Parameter(Position = 0, ValueFromRemainingArguments = $true)]
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[string] $Cmd
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)
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function Get-SSHDir {
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return Join-Path "C:/Users/$env:JENKINS_AGENT_USER" '.ssh'
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}
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function Check-SSHDir {
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$sshDir = Get-SSHDir
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if(-not (Test-Path $sshDir)) {
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New-Item -Type Directory -Path $sshDir | Out-Null
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icacls.exe $sshDir /setowner $env:JENKINS_AGENT_USER | Out-Null
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icacls.exe $sshDir /grant $('{0}:(CI)(OI)(F)' -f $env:JENKINS_AGENT_USER) /grant "administrators:(CI)(OI)(F)" | Out-Null
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icacls.exe $sshDir /inheritance:r | Out-Null
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}
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}
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function Write-Key($Key) {
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# this writes the key and sets the permissions correctly for pubkey auth
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$authorizedKeys = Join-Path (Get-SSHDir) 'authorized_keys'
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Set-Content -Path $authorizedKeys -Value "$Key" -Encoding UTF8
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icacls.exe $authorizedKeys /setowner $env:JENKINS_AGENT_USER | Out-Null
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}
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function Write-HostKey($Key) {
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# this writes the key and sets the permissions
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$knownHosts = Join-Path (Get-SSHDir) 'known_hosts'
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Set-Content -Path $knownHosts -Value "$Key" -Encoding UTF8
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icacls.exe $knownHosts /setowner $env:JENKINS_AGENT_USER | Out-Null
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}
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# Give the user Full Access to the home directory
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icacls.exe "C:/Users/$env:JENKINS_AGENT_USER" /grant "${env:JENKINS_AGENT_USER}:(CI)(OI)(F)" | Out-Null
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# check the .ssh dir permissions
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Check-SSHDir
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if($env:JENKINS_AGENT_SSH_PUBKEY -match "^ssh-.*") {
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Write-Key $env:JENKINS_AGENT_SSH_PUBKEY
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}
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$index = 0
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$knownHostKeyVar = Get-ChildItem -Path "env:JENKINS_AGENT_SSH_KNOWNHOST_$index" -ErrorAction 'SilentlyContinue'
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while($null -ne $knownHostKeyVar) {
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Write-HostKey $knownHostKeyVar.Value
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$index++
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$knownHostKeyVar = Get-ChildItem env: -Name "JENKINS_AGENT_SSH_KNOWNHOST_$index"
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}
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# ensure variables passed to docker container are also exposed to ssh sessions
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Get-ChildItem env: | ForEach-Object { setx /m $_.Name $_.Value | Out-Null }
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if(![System.String]::IsNullOrWhiteSpace($Cmd)) {
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Write-Host "$($MyInvocation.MyCommand.Name) param: '$Cmd'"
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if($Cmd -match "^ssh-.*") {
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Write-Host "Authorizing ssh pubkey found in params."
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Write-Key $Cmd
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} elseif($Cmd -match "^/usr/sbin/sshd") {
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# neutralize default jenkins docker-plugin command
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# we will run sshd at the end anyway
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Write-Host "Ignoring provided (linux) sshd command."
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} else {
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Write-Host "Executing param: $Cmd"
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& $Cmd
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exit
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}
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}
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Start-Service sshd
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# dump network information
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ipconfig
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netstat -a
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# aside from forwarding ssh logs, this keeps the container open
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Get-Content -Path "C:\ProgramData\ssh\logs\sshd.log" -Wait
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