GSSAPI wrapper for gokrb5

The github.com/bodgit/gssapi package implements a GSSAPI-like wrapper around the github.com/jcmturner/gokrb5 package.

Sample Initiator (Client):

package main

import (
	. "github.com/bodgit/gssapi"
	"github.com/jcmturner/gokrb5/v8/gssapi"
)

func main() {
	initiator, err := NewInitiator(WithRealm("EXAMPLE.COM"), WithUsername("test"), WithKeytab[Initiator]("test.keytab"))
	if err != nil {
		panic(err)
	}

	defer initiator.Close()

	output, cont, err := initiator.Initiate("host/ssh.example.com", gssapi.ContextFlagInteg|gssapi.ContextFlagMutual, nil)
	if err != nil {
		panic(err)
	}

	// transmit output to Acceptor

	signature, err := initiator.MakeSignature(message)
	if err != nil {
		panic(err)
	}

	// transmit message and signature to Acceptor
}

Sample Acceptor (Server):

package main

import (
	. "github.com/bodgit/gssapi"
	"github.com/jcmturner/gokrb5/v8/gssapi"
	"github.com/jcmturner/gokrb5/v8/iana/nametype"
	"github.com/jcmturner/gokrb5/v8/types"
)

func main() {
	principal := types.NewPrincipalName(nametype.KRB_NT_SRV_HST, "host/ssh.example.com")

	acceptor, err := NewAcceptor(WithServicePrincipal(&principal))
	if err != nil {
		panic(err)
	}

	defer acceptor.Close()

	// receive input from Initiator

	output, cont, err := acceptor.Accept(input)
	if err != nil {
		panic(err)
	}

	// transmit output back to Initiator

	// receive message and signature from Initiator

	if err := acceptor.VerifySignature(message, signature); err != nil {
		panic(err)
	}
}