Fix hostkey being too short

Modern versions of ssh refuse to connect to a server with a rsa key that
  is less than 2048 and this may change to 3072 or 4096 in the future.
  ed25519 cannot change keysize

breakglass.go

@@ -6,8 +6,8 @@ import (
 	"bufio"
 	"bytes"
 	"context"
+	"crypto/ed25519"
 	"crypto/rand"
-	"crypto/rsa"
 	"crypto/x509"
 	"encoding/pem"
 	"flag"
@@ -91,7 +91,7 @@ func loadHostKey(path string) (ssh.Signer, error) {
 }
 
 func createHostKey(path string) (ssh.Signer, error) {
-	key, err := rsa.GenerateKey(rand.Reader, 1024)
+	_, key, err := ed25519.GenerateKey(rand.Reader)
 	if err != nil {
 		return nil, err
 	}

ssh.go

@@ -242,9 +242,6 @@ func (s *session) request(ctx context.Context, req *ssh.Request) error {
 		if err := ssh.Unmarshal(req.Payload, &r); err != nil {
 			return err
 		}
-		if r.TERM != "" {
-			s.env = append(s.env, fmt.Sprintf("TERM=%s", r.TERM))
-		}
 
 		var err error
 		s.ptyf, s.ttyf, err = pty.Open()