// updateSSHAgent takes the list of certificates and path to the private key (corresponding to the signed public key). Adds the cert if it's not present in the agent.
func updateSSHAgent(certsWithKeyList []*api.CertificateAndPrivateKey, privateKeyPath string) error {
conn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
if err != nil {
return err
}
defer conn.Close()
sshAgent := agent.NewClient(conn)
certsInSSHAgent, err := sshAgent.List()
if err != nil {
return err
}
privateKeyBytes, err := ioutil.ReadFile(privateKeyPath)
if err != nil {
return err
}
privateKeyInterface, err := ssh.ParseRawPrivateKey(privateKeyBytes)
if err != nil {
return err
}
// TODO optimize this. currently O(N^2)
for _, certAndKey := range certsWithKeyList {
cert, err := util.ParseSSHCert([]byte(certAndKey.Cert))
for _, key := range certsInSSHAgent {
certBlob := key.Blob
if err != nil {
return err
}
if bytes.Equal(certBlob, cert.Marshal()) {
break
}
}
err = sshAgent.Add(privateKeyInterface, cert, "certificate added by shortbread")
if err != nil {
return err
}
}
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))
}
}