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How to setup ‘ssh’ trusts between Linux and VMS

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Please note:

• The prompts will tell you where to execute the commands, "VMS$" (system user) or "Linux#"  (root user)
• Remember Linux/Unix is case sensitive, VMS is not
• Linux: if VMS host is not known, add it to /etc/hosts for example
• VMS: if Linux is not known, add it using: $ UCX SET HOST LINUX /ADDR=xx.xx.xx.xx

• Enable SSH on the VMS server:

  VMS$ SET DEF SYS$LOGIN VMS$ @TCPIP$CONFIG

  
  

• Select then:
  • Option 3 - Server components then enable and start service SSH, option 19

  • then Option 2 - Enable & Start service on this node

    ... * Create a new default server host key? YES: YES      Creating private key file: TCPIP$SSH_DEVICE:TCPIP$SSH.SSH2]HOSTKEY      Creating public key file: TCPIP$SSH_DEVICE:TCPIP$SSH.SSH2]HOSTKEY.PUB ...

    
    

• Generate the key on the Linux server and convert it to be readable by VMS

  Linux# ssh-keygen -t rsa → Do not specify a passphrase Linux# ssh-keygen -e -f /root/.ssh/id_rsa.pub > /root/.ssh/linuxserver.pub

  
  

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• On the VMS system add the Linux server key to the authorized keys:

  VMS$ SET DEF SYS$SYSLOGIN VMS$ SET DEF SYS$SYSROOT:[.SSH2] VMS$ OPEN/WRITE TMP AUTHORIZATION. If the file already exists, use /APPEND instead of /WRITE VMS$ WRITE TMP "KEY LINUXSERVER.PUB" VMS$ CLOSE TMP

  Do not forget the dot at the end of the authorization file name

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• Perform some tests (examples)
  Charon server name "charon", vms system name "pluto":

  charon# ssh system@pluto "show system /noproc" OpenVMS V7.3-2 on node PLUTO 27-SEP-2013 11:50:14.37 Uptime 0 19:20:07

  
  

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