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package sshd
import (
"crypto/rand"
"crypto/rsa"
"io"
"golang.org/x/crypto/ssh"
)
// NewRandomSigner generates a random key of a desired bit length.
func NewRandomSigner(bits int) (ssh.Signer, error) {
key, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return nil, err
}
return ssh.NewSignerFromKey(key)
}
// NewClientConfig creates a barebones ssh.ClientConfig to be used with ssh.Dial.
func NewClientConfig(name string) *ssh.ClientConfig {
return &ssh.ClientConfig{
User: name,
Auth: []ssh.AuthMethod{
ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
return
}),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
}
// ConnectShell makes a barebones SSH client session, used for testing.
func ConnectShell(host string, name string, handler func(r io.Reader, w io.WriteCloser) error) error {
config := NewClientConfig(name)
conn, err := ssh.Dial("tcp", host, config)
if err != nil {
return err
}
defer conn.Close()
session, err := conn.NewSession()
if err != nil {
return err
}
defer session.Close()
in, err := session.StdinPipe()
if err != nil {
return err
}
out, err := session.StdoutPipe()
if err != nil {
return err
}
/*
err = session.RequestPty("xterm", 80, 40, ssh.TerminalModes{})
if err != nil {
return err
}
*/
err = session.Shell()
if err != nil {
return err
}
_, err = session.SendRequest("ping", true, nil)
if err != nil {
return err
}
return handler(out, in)
}
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