func (c *BaseCluster) sshConfig() (*ssh.ClientConfig, error) {
signer, err := ssh.NewSignerFromKey(c.SSHKey.PrivateKey)
if err != nil {
return nil, err
}
sshConfig := &ssh.ClientConfig{
User: c.SSHUsername,
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
}
return sshConfig, nil
}
func testLockAgent(agent Agent, t *testing.T) {
if err := agent.Add(testPrivateKeys["rsa"], nil, "comment 1"); err != nil {
t.Errorf("Add: %v", err)
}
if err := agent.Add(testPrivateKeys["dsa"], nil, "comment dsa"); err != nil {
t.Errorf("Add: %v", err)
}
if keys, err := agent.List(); err != nil {
t.Errorf("List: %v", err)
} else if len(keys) != 2 {
t.Errorf("Want 2 keys, got %v", keys)
}
passphrase := []byte("secret")
if err := agent.Lock(passphrase); err != nil {
t.Errorf("Lock: %v", err)
}
if keys, err := agent.List(); err != nil {
t.Errorf("List: %v", err)
} else if len(keys) != 0 {
t.Errorf("Want 0 keys, got %v", keys)
}
signer, _ := ssh.NewSignerFromKey(testPrivateKeys["rsa"])
if _, err := agent.Sign(signer.PublicKey(), []byte("hello")); err == nil {
t.Fatalf("Sign did not fail")
}
if err := agent.Remove(signer.PublicKey()); err == nil {
t.Fatalf("Remove did not fail")
}
if err := agent.RemoveAll(); err == nil {
t.Fatalf("RemoveAll did not fail")
}
if err := agent.Unlock(nil); err == nil {
t.Errorf("Unlock with wrong passphrase succeeded")
}
if err := agent.Unlock(passphrase); err != nil {
t.Errorf("Unlock: %v", err)
}
if err := agent.Remove(signer.PublicKey()); err != nil {
t.Fatalf("Remove: %v", err)
}
if keys, err := agent.List(); err != nil {
t.Errorf("List: %v", err)
} else if len(keys) != 1 {
t.Errorf("Want 1 keys, got %v", keys)
}
}
func (c *client) insertCert(s interface{}, cert *ssh.Certificate, comment string) error {
var req []byte
switch k := s.(type) {
case *rsa.PrivateKey:
if len(k.Primes) != 2 {
return fmt.Errorf("agent: unsupported RSA key with %d primes", len(k.Primes))
}
k.Precompute()
req = ssh.Marshal(rsaCertMsg{
Type: cert.Type(),
CertBytes: cert.Marshal(),
D: k.D,
Iqmp: k.Precomputed.Qinv,
P: k.Primes[0],
Q: k.Primes[1],
Comments: comment,
})
case *dsa.PrivateKey:
req = ssh.Marshal(dsaCertMsg{
Type: cert.Type(),
CertBytes: cert.Marshal(),
X: k.X,
Comments: comment,
})
case *ecdsa.PrivateKey:
req = ssh.Marshal(ecdsaCertMsg{
Type: cert.Type(),
CertBytes: cert.Marshal(),
D: k.D,
Comments: comment,
})
default:
return fmt.Errorf("agent: unsupported key type %T", s)
}
signer, err := ssh.NewSignerFromKey(s)
if err != nil {
return err
}
if bytes.Compare(cert.Key.Marshal(), signer.PublicKey().Marshal()) != 0 {
return errors.New("agent: signer and cert have different public key")
}
resp, err := c.call(req)
if err != nil {
return err
}
if _, ok := resp.(*successAgentMsg); ok {
return nil
}
return errors.New("agent: failure")
}
func (p privateKeySigner) Decrypt() (ssh.Signer, error) {
if p.key == nil {
pem, err := x509.DecryptPEMBlock(p.pem, []byte(p.Passphrase()))
if err != nil {
return nil, err
}
p.key, err = x509.ParsePKCS1PrivateKey(pem)
if err != nil {
return nil, err
}
p.Encrypted = false
}
return ssh.NewSignerFromKey(p.key)
}
func testAgentInterface(t *testing.T, agent Agent, key interface{}, cert *ssh.Certificate) {
signer, err := ssh.NewSignerFromKey(key)
if err != nil {
t.Fatalf("NewSignerFromKey(%T): %v", key, err)
}
// The agent should start up empty.
if keys, err := agent.List(); err != nil {
t.Fatalf("RequestIdentities: %v", err)
} else if len(keys) > 0 {
t.Fatalf("got %d keys, want 0: %v", len(keys), keys)
}
// Attempt to insert the key, with certificate if specified.
var pubKey ssh.PublicKey
if cert != nil {
err = agent.Add(key, cert, "comment")
pubKey = cert
} else {
err = agent.Add(key, nil, "comment")
pubKey = signer.PublicKey()
}
if err != nil {
t.Fatalf("insert(%T): %v", key, err)
}
// Did the key get inserted successfully?
if keys, err := agent.List(); err != nil {
t.Fatalf("List: %v", err)
} else if len(keys) != 1 {
t.Fatalf("got %v, want 1 key", keys)
} else if keys[0].Comment != "comment" {
t.Fatalf("key comment: got %v, want %v", keys[0].Comment, "comment")
} else if !bytes.Equal(keys[0].Blob, pubKey.Marshal()) {
t.Fatalf("key mismatch")
}
// Can the agent make a valid signature?
data := []byte("hello")
sig, err := agent.Sign(pubKey, data)
if err != nil {
t.Fatalf("Sign(%s): %v", pubKey.Type(), err)
}
if err := pubKey.Verify(data, sig); err != nil {
t.Fatalf("Verify(%s): %v", pubKey.Type(), err)
}
}
func (c *SSHCluster) importSSHKeyPair(t *TargetServer) error {
var buf bytes.Buffer
_, file, readFileErrChan := c.base.PromptFileInput(fmt.Sprintf("Please provide your private key for %s@%s", t.User, t.IP))
if _, err := io.Copy(&buf, file); err != nil {
readFileErrChan <- err
return err
}
readFileErrChan <- nil // no error reading file
b, _ := pem.Decode(buf.Bytes())
if b == nil {
return fmt.Errorf("Invalid private key")
}
var pemBytes []byte
if x509.IsEncryptedPEMBlock(b) {
passphrase := c.base.PromptProtectedInput("Please enter the passphrase for the key")
var err error
pemBytes, err = x509.DecryptPEMBlock(b, []byte(passphrase))
if err != nil {
return err
}
} else {
pemBytes = b.Bytes
}
privateKey, err := x509.ParsePKCS1PrivateKey(pemBytes)
if err != nil {
return err
}
signer, err := ssh.NewSignerFromKey(privateKey)
if err != nil {
return err
}
auth := []ssh.AuthMethod{ssh.PublicKeys(signer)}
sshConfig := c.sshConfigForAuth(t, auth)
c.base.SendLog(fmt.Sprintf("Testing provided key for %s@%s", t.User, t.IP))
if !c.testAndAddAuthentication(t, sshConfig) {
return fmt.Errorf("Provided key for %s@%s failed to authenticate", t.User, t.IP)
}
c.base.SendLog(fmt.Sprintf("Key verified for %s@%s", t.User, t.IP))
return nil
}
func init() {
var err error
n := len(testdata.PEMBytes)
testPrivateKeys = make(map[string]interface{}, n)
testSigners = make(map[string]ssh.Signer, n)
testPublicKeys = make(map[string]ssh.PublicKey, n)
for t, k := range testdata.PEMBytes {
testPrivateKeys[t], err = ssh.ParseRawPrivateKey(k)
if err != nil {
panic(fmt.Sprintf("Unable to parse test key %s: %v", t, err))
}
testSigners[t], err = ssh.NewSignerFromKey(testPrivateKeys[t])
if err != nil {
panic(fmt.Sprintf("Unable to create signer for test key %s: %v", t, err))
}
testPublicKeys[t] = testSigners[t].PublicKey()
}
// Create a cert and sign it for use in tests.
testCert := &ssh.Certificate{
Nonce: []byte{}, // To pass reflect.DeepEqual after marshal & parse, this must be non-nil
ValidPrincipals: []string{"gopher1", "gopher2"}, // increases test coverage
ValidAfter: 0, // unix epoch
ValidBefore: ssh.CertTimeInfinity, // The end of currently representable time.
Reserved: []byte{}, // To pass reflect.DeepEqual after marshal & parse, this must be non-nil
Key: testPublicKeys["ecdsa"],
SignatureKey: testPublicKeys["rsa"],
Permissions: ssh.Permissions{
CriticalOptions: map[string]string{},
Extensions: map[string]string{},
},
}
testCert.SignCert(rand.Reader, testSigners["rsa"])
testPrivateKeys["cert"] = testPrivateKeys["ecdsa"]
testSigners["cert"], err = ssh.NewCertSigner(testCert, testSigners["ecdsa"])
if err != nil {
panic(fmt.Sprintf("Unable to create certificate signer: %v", err))
}
}
func addKey(conf *ssh.ServerConfig, block *pem.Block) (err error) {
var key interface{}
switch block.Type {
case "RSA PRIVATE KEY":
key, err = x509.ParsePKCS1PrivateKey(block.Bytes)
case "EC PRIVATE KEY":
key, err = x509.ParseECPrivateKey(block.Bytes)
case "DSA PRIVATE KEY":
key, err = ssh.ParseDSAPrivateKey(block.Bytes)
default:
return fmt.Errorf("unsupported key type %q", block.Type)
}
if err != nil {
return err
}
signer, err := ssh.NewSignerFromKey(key)
if err != nil {
return err
}
conf.AddHostKey(signer)
return nil
}
// Insert adds a private key to the keyring. If a certificate
// is given, that certificate is added as public key.
func (r *keyring) Add(priv interface{}, cert *ssh.Certificate, comment string) error {
r.mu.Lock()
defer r.mu.Unlock()
if r.locked {
return errLocked
}
signer, err := ssh.NewSignerFromKey(priv)
if err != nil {
return err
}
if cert != nil {
signer, err = ssh.NewCertSigner(cert, signer)
if err != nil {
return err
}
}
r.keys = append(r.keys, privKey{signer, comment})
return nil
}
func (c *SSHCluster) findSSHAuth() error {
c.base.SendLog("Detecting authentication")
testAndAddAuthMethod := func(t *TargetServer, a ssh.AuthMethod) bool {
sshConfig := c.sshConfigForAuth(t, []ssh.AuthMethod{a})
if c.testAndAddAuthentication(t, sshConfig) {
c.base.SendLog(fmt.Sprintf("Verified authentication for %s@%s", t.User, t.IP))
return true
}
return false
}
testAndAddSigner := func(t *TargetServer, s ssh.Signer) bool {
return testAndAddAuthMethod(t, ssh.PublicKeys(s))
}
testAllAuthenticated := func(targets []*TargetServer) bool {
for _, t := range targets {
if t.SSHConfig == nil {
return false
}
}
return true
}
sshAgent := c.sshAgent()
sshAgentAuth := ssh.PublicKeysCallback(sshAgent.Signers)
for _, t := range c.Targets {
testAndAddAuthMethod(t, sshAgentAuth)
}
if testAllAuthenticated(c.Targets) {
return nil
}
var agentKeys [][]byte
if keys, err := sshAgent.List(); err == nil {
agentKeys = make([][]byte, len(keys))
for i, k := range keys {
agentKeys[i] = k.Marshal()
}
}
var signers []privateKeySigner
signerloop:
for _, s := range c.findSSHKeySigners() {
if s.publicKey != nil {
for _, k := range agentKeys {
if bytes.Equal(k, s.publicKey.Marshal()) {
continue signerloop
}
}
}
signers = append(signers, s)
}
outer:
for _, t := range c.Targets {
if t.SSHConfig != nil {
continue
}
for _, s := range signers {
if s.Encrypted {
if s.publicKey == nil {
signer, err := s.Decrypt()
if err != nil {
continue
}
if testAndAddSigner(t, signer) {
continue outer
}
} else {
if testAndAddSigner(t, s) {
continue outer
}
}
} else {
signer, err := ssh.NewSignerFromKey(s.key)
if err != nil {
continue
}
if testAndAddSigner(t, signer) {
continue outer
}
}
}
}
for _, t := range c.Targets {
if t.SSHConfig != nil {
continue
}
answer, err := c.base.ChoicePrompt(Choice{
Message: "No working authentication found.\nPlease choose one of the following options:",
Options: []ChoiceOption{
{
Type: 1,
Name: "Private key",
Value: "1",
},
{
Name: "Password",
Value: "2",
},
{
Name: "Abort",
Value: "3",
},
},
})
if err != nil {
return err
}
switch answer {
case "1":
if err := c.importSSHKeyPair(t); err != nil {
return err
} else {
continue
}
case "2":
password := c.base.PromptProtectedInput(fmt.Sprintf("Please enter your password for %s@%s", t.User, t.IP))
if testAndAddAuthMethod(t, ssh.Password(password)) {
continue
}
}
return fmt.Errorf("No working authentication found")
}
return nil
}