putty_hosts

README

Putty Hosts

For another project I need to parse hosts to use with golang.org/x/crypto/ssh

In Windows, this is stored in the registry under HKEY_CURRENT_USER\SoftWare\SimonTatham\PuTTY\SshHostKeys where the key name is the algorithum, port and host and the actual public key is stored as simply really big numbers.

[HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys]
"ssh-ed25519@22:10.10.0.1"="0x32d013e2996f93c5f5cec2ab3aac303434f31775aababf3ea342e1227ab4ac36,0x45d63b169d50b797498eb035b1055c6e83e36f21b1da140c3ed3caa60fa4d866"

In Linux (Unix, etc), this is stored in ~/.putty/sshhostkeys in basically the same format but space deliniated

ssh-ed25519@22:10.10.0.1 0x32d013e2996f93c5f5cec2ab3aac303434f31775aababf3ea342e1227ab4ac36,0x45d63b169d50b797498eb035b1055c6e83e36f21b1da140c3ed3caa60fa4d866

Due to the way golang.org/x/crypto/ssh handles it's keys, it's just simpler to convert to openssh compatible known_hosts lines and call it a day.

Documentation

Index

• func KnownHosts() (ssh.HostKeyCallback, error)
• func ParseKeyName(keyName string) (algo, host string)
• func ToPutty(knownHost string) (keyName, keyValue string, err error)
• func ToSSH(keyName, keyValue string) (result string, err error)

Functions

func KnownHosts

func KnownHosts() (ssh.HostKeyCallback, error)

KnownHosts returns a ssh/knownhosts handler by by converting the putty registry keys to a file - I was lazy

func ParseKeyName

func ParseKeyName(keyName string) (algo, host string)

func ToPutty

func ToPutty(knownHost string) (keyName, keyValue string, err error)

func ToSSH

func ToSSH(keyName, keyValue string) (result string, err error)

ToSSH will convert a putty registry key/value combination into a known_hosts entry.