A script which can be used to start a second SSHD daemon on OS X. This is an workaround for running tests using xcodebuild through ssh with Jenkins .

customsshd

#!/bin/bash

INSTALL_PATH="$HOME/scripts"
SCRIPT_PATH="$INSTALL_PATH/customsshd"
LAUNCHCTL_PATH="$HOME/Library/LaunchAgents/com.my.customsshd.plist"
SSH_KEYS_INSTALL_PATH=$HOME/customkeys
SSH_HOST_KEY=$SSH_KEYS_INSTALL_PATH/ssh_host_key
SSH_HOST_RSA_KEY=$SSH_KEYS_INSTALL_PATH/ssh_host_rsa_key
SSH_HOST_DSA_KEY=$SSH_KEYS_INSTALL_PATH/ssh_host_dsa_key
SSHD_PORT=50111
SSH_AUTHORIZED_KEYS_PATH="$HOME/.ssh/authorized_keys"

[ ! -f $SSH_HOST_KEY ]     && ssh-keygen -q -t rsa1 -f $SSH_HOST_KEY      -N "" -C "" < /dev/null > /dev/null 2> /dev/null
[ ! -f $SSH_HOST_RSA_KEY ] && ssh-keygen -q -t rsa  -f $SSH_HOST_RSA_KEY  -N "" -C "" < /dev/null > /dev/null 2> /dev/null
[ ! -f $SSH_HOST_DSA_KEY ] && ssh-keygen -q -t dsa  -f $SSH_HOST_DSA_KEY  -N "" -C "" < /dev/null > /dev/null 2> /dev/null

#add you public rsa key here, the authentication is ssh key based
CUSTOM_ID_RSA_PUBKEY="ssh-rsa AAAAB3NzaC1yc2dfgdfgDAQABAAABAQDRGnX9NX4K/D3Ex5NF514AyUxQCu/+nJnjyZudY5+dsfsdfewrwedgdfg/+MCTCQ6pO0RQ42dH5P41bBD5nju9yDyfK6pfUz89vwqwC5HtAOC27VWU/dfgdfg/3B1jlR5i7zzUUmMojSNZTRIFy/dffgdg/ICLObc6kwF4hSdGCpdbzDpLyCXSDQDjAJbBb//cgB4gqBcv3Nc7sh3woT7J9JH6aHFAgmn5R5dwL3P user@host.com"

#insert the key if it is not in authorized_keys
function verifyPubKey()
{
 if [ -f "$SSH_AUTHORIZED_KEYS_PATH" ];
 then
     PUBKEYEXISTS=`grep -q "$CUSTOM_ID_RSA_PUBKEY" "$SSH_AUTHORIZED_KEYS_PATH"`
     if [[ $? -eq 1 ]]
     then
       injectPubKey
     fi
 else
      injectPubKey
     
 fi
}

function injectPubKey()
{
  echo "$CUSTOM_ID_RSA_PUBKEY" >> "$SSH_AUTHORIZED_KEYS_PATH"
  chmod 600 "$SSH_AUTHORIZED_KEYS_PATH"
}

function runSSHD() {

  /usr/sbin/sshd -D -p $SSHD_PORT -h $SSH_HOST_KEY -h $SSH_HOST_RSA_KEY -h $SSH_HOST_DSA_KEY -o UsePam=yes -o Protocol=1,2 -o PubkeyAuthentication=yes -o RSAAuthentication=yes
 
}

function installLaunchAgent()
{


cat > "$LAUNCHCTL_PATH" << EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
   <key>Label</key>
   <string>com.my.customsshd</string>
   <key>Program</key>
   <string>$SCRIPT_PATH</string>
   <key>RunAtLoad</key>
   <true/>
   <key>KeepAlive</key>
   <true/>
   <key>StandardOutPath</key>
   <string>/tmp/customsshd.log</string>
   <key>StandardErrorPath</key>
   <string>/tmp/customsshd_err.log</string>
</dict>
</plist>
EOF

launchctl load -w "$LAUNCHCTL_PATH"

echo "customsshd has been installed"

}

#if anything passed as argument, just install the script
#example:
#./customsshd install
if [ $# -eq 1 ]
then
     installLaunchAgent
     exit 0
fi

verifyPubKey


while :
do

   runSSHD

done

Run ./customsshd install to install it. Once installed the ssh port is 50111. The authentication is ssh key based. You need to generate a public and a private rsa key. The public one you need to add it to this script.

Hello,

thank you very much for this tool ... I have a problem with it and I think I do not have it configured correctly.
Maybe you can help me out?

I have the following setup:

1. Jenkins Master ist a Unix Server
2. For iOS Builds I have a Mac Mini with Mavericks configured as a SSH-slave (Xcode 6)

I performed the following steps:

1. created the folders mentioned in your script INSTALL_PATH="$HOME/scripts"
   SCRIPT_PATH="$INSTALL_PATH/customsshd" and moved the script to the later
2. adjusted the SSH port from 50111 to 2223
3. entered the public key of the user I use to connect master and slave
4. called ./customsshd install
5. changed the configuration of my slave node in jenkins to listen to 2223
6. restarted the Mac Mini Build Slave
7. the slave node connects successfully upon restart
8. I can still run my build scripts
9. when attempting to test I still get the same error message as before:

Test target MyApp Tests encountered an error (Timed out waiting 120 seconds for simulator to boot, current state is 1
(the simulator opens, but the app is not installed)

Is there something I forgot or configured wrongly?

Thank you very much,

mgehlen