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package ssh
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"net"
"os"
"syscall"
"github.com/mimecast/dtail/internal/io/dlog"
gossh "golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"golang.org/x/crypto/ssh/terminal"
)
// GeneratePrivateRSAKey is used by the server to generate its key.
func GeneratePrivateRSAKey(size int) (*rsa.PrivateKey, error) {
privateKey, err := rsa.GenerateKey(rand.Reader, size)
if err != nil {
return nil, err
}
err = privateKey.Validate()
if err != nil {
return nil, err
}
return privateKey, nil
}
// EncodePrivateKeyToPEM is a helper function for converting a key to PEM format.
func EncodePrivateKeyToPEM(privateKey *rsa.PrivateKey) []byte {
derFormat := x509.MarshalPKCS1PrivateKey(privateKey)
block := pem.Block{
Type: "RSA PRIVATE KEY",
Headers: nil,
Bytes: derFormat,
}
return pem.EncodeToMemory(&block)
}
// Agent used for SSH auth.
func Agent() (gossh.AuthMethod, error) {
sshAgent, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
if err != nil {
return nil, err
}
agentClient := agent.NewClient(sshAgent)
keys, err := agentClient.List()
if err != nil {
return nil, err
}
for i, key := range keys {
dlog.Common.Debug("Public key", i, key)
}
return gossh.PublicKeysCallback(agentClient.Signers), nil
}
// EnterKeyPhrase is required to read phrase protected private keys.
func EnterKeyPhrase(keyFile string) []byte {
fmt.Printf("Enter phrase for key %s: ", keyFile)
phrase, err := terminal.ReadPassword(int(syscall.Stdin))
if err != nil {
panic(err)
}
fmt.Printf("%s\n", string(phrase))
return phrase
}
// KeyFile returns the key as a SSH auth method.
func KeyFile(keyFile string) (gossh.AuthMethod, error) {
buffer, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, err
}
key, err := gossh.ParsePrivateKey(buffer)
if err != nil {
return nil, err
}
// Key phrase support disabled as password will be printed to stdout!
/*
if err == nil {
return gossh.PublicKeys(key), nil
}
keyPhrase := EnterKeyPhrase(keyFile)
key, err = gossh.ParsePrivateKeyWithPassphrase(buffer, keyPhrase)
if err != nil {
return nil, err
}
*/
return gossh.PublicKeys(key), nil
}
// PrivateKey returns the private key as a SSH auth method.
func PrivateKey(keyFile string) (gossh.AuthMethod, error) {
signer, err := KeyFile(keyFile)
if err != nil {
dlog.Common.Debug(keyFile, err)
return nil, err
}
return gossh.AuthMethod(signer), nil
}
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