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connector.go
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connector.go
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package clients
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"github.com/shipyard-run/connector/crypto"
"github.com/shipyard-run/connector/protos/shipyard"
"github.com/shipyard-run/gohup"
"github.com/shipyard-run/shipyard/pkg/utils"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
// Connector defines a client which can be used for interfacing with the
// Shipyard connector
type Connector interface {
// Start the Connector, returns an error on failure
Start(*CertBundle) error
// Stop the Connector, returns an error on failure
Stop() error
// IsRunning returns true when the Connector is running
IsRunning() bool
// GenerateLocalCertBundle generates a root CA and leaf certificate for
// securing connector communications for the local instance
// this function is a convenience function which wraps other
// methods
GenerateLocalCertBundle(out string) (*CertBundle, error)
// Fetches the local certificate bundle from the given directory
// if any of the required files do not exist an error and a nil
// CertBundle will be returned
GetLocalCertBundle(dir string) (*CertBundle, error)
// Generates a Leaf certificate for securing a connector
GenerateLeafCert(
privateKey, rootCA string,
hosts, ips []string,
dir string) (*CertBundle, error)
// ExposeService allows you to expose a local or remote
// service with another connector
ExposeService(
name string,
port int,
remoteAddr string,
destAddr string,
direction string,
) (string, error)
// RemoveService removes a previously exposed service
RemoveService(id string) error
// ListServices returns a slice of active services
ListServices() ([]*shipyard.Service, error)
}
var defaultArgs = []string{
"connector",
"--help",
}
// ConnectorImpl is a concrete implementation of the Connector interface
type ConnectorImpl struct {
options ConnectorOptions
}
type ConnectorOptions struct {
LogDirectory string
BinaryPath string
GrpcBind string
HTTPBind string
APIBind string
LogLevel string
PidFile string
}
type CertBundle struct {
RootCertPath string
RootKeyPath string
LeafCertPath string
LeafKeyPath string
}
func DefaultConnectorOptions() ConnectorOptions {
co := ConnectorOptions{}
co.LogDirectory = utils.LogsDir()
co.BinaryPath = utils.GetShipyardBinaryPath()
co.GrpcBind = ":30001"
co.HTTPBind = ":30002"
co.APIBind = ":30003"
co.LogLevel = "info"
co.PidFile = utils.GetConnectorPIDFile()
return co
}
// NewConnector creates a new connector with the given options
func NewConnector(opts ConnectorOptions) Connector {
return &ConnectorImpl{options: opts}
}
// Start the Connector, returns an error on failure
func (c *ConnectorImpl) Start(cb *CertBundle) error {
// get the log level from the environment variable
ll := os.Getenv("LOG_LEVEL")
if ll == "" {
ll = "info"
}
lp := &gohup.LocalProcess{}
o := gohup.Options{
Path: c.options.BinaryPath,
Args: []string{
"connector",
"run",
"--grpc-bind", c.options.GrpcBind,
"--http-bind", c.options.HTTPBind,
"--api-bind", c.options.APIBind,
"--root-cert-path", cb.RootCertPath,
"--server-cert-path", cb.LeafCertPath,
"--server-key-path", cb.LeafKeyPath,
"--log-level", ll,
},
Logfile: filepath.Join(c.options.LogDirectory, "connector.log"),
Pidfile: c.options.PidFile,
}
var err error
_, c.options.PidFile, err = lp.Start(o)
return err
}
// Stop the Connector, returns an error on failure
func (c *ConnectorImpl) Stop() error {
lp := &gohup.LocalProcess{}
return lp.Stop(c.options.PidFile)
}
// IsRunning returns true when the Connector is running
func (c *ConnectorImpl) IsRunning() bool {
lp := &gohup.LocalProcess{}
status, err := lp.QueryStatus(c.options.PidFile)
if err != nil {
return false
}
if status == gohup.StatusRunning {
return true
}
return false
}
// creates a CA and local leaf cert
func (c *ConnectorImpl) GenerateLocalCertBundle(out string) (*CertBundle, error) {
cb := &CertBundle{
RootCertPath: filepath.Join(out, "root.cert"),
RootKeyPath: filepath.Join(out, "root.key"),
LeafCertPath: filepath.Join(out, "leaf.cert"),
LeafKeyPath: filepath.Join(out, "leaf.key"),
}
// create the CA
rk, err := crypto.GenerateKeyPair()
if err != nil {
return nil, err
}
ca, err := crypto.GenerateCA(rk.Private)
if err != nil {
return nil, err
}
os.Remove(cb.RootKeyPath)
err = rk.Private.WriteFile(cb.RootKeyPath)
if err != nil {
return nil, err
}
os.Remove(cb.RootCertPath)
err = ca.WriteFile(cb.RootCertPath)
if err != nil {
return nil, err
}
grcpParts := strings.Split(c.options.GrpcBind, ":")
httpParts := strings.Split(c.options.GrpcBind, ":")
ips := utils.GetLocalIPAddresses()
host := []string{
utils.GetHostname(),
fmt.Sprintf("localhost:%s", grcpParts[1]),
fmt.Sprintf("localhost:%s", httpParts[1]),
}
return c.GenerateLeafCert(cb.RootKeyPath, cb.RootCertPath, host, ips, out)
}
func (c *ConnectorImpl) GetLocalCertBundle(dir string) (*CertBundle, error) {
cb := &CertBundle{
RootCertPath: filepath.Join(dir, "root.cert"),
RootKeyPath: filepath.Join(dir, "root.key"),
LeafCertPath: filepath.Join(dir, "leaf.cert"),
LeafKeyPath: filepath.Join(dir, "leaf.key"),
}
// test to see if files exist
f1, err := os.Open(cb.RootCertPath)
if os.IsNotExist(err) {
return nil, fmt.Errorf("Unable to find root certificate")
}
defer f1.Close()
f2, err := os.Open(cb.RootKeyPath)
if os.IsNotExist(err) {
return nil, fmt.Errorf("Unable to find root key")
}
defer f2.Close()
f3, err := os.Open(cb.LeafCertPath)
if os.IsNotExist(err) {
return nil, fmt.Errorf("Unable to find leaf certificate")
}
defer f3.Close()
f4, err := os.Open(cb.LeafKeyPath)
if os.IsNotExist(err) {
return nil, fmt.Errorf("Unable to find leaf key")
}
defer f4.Close()
return cb, nil
}
// GenerateLeafCert generates a x509 leaf certificate with the given details
func (c *ConnectorImpl) GenerateLeafCert(
rootKey, rootCA string, host, ips []string, dir string) (*CertBundle, error) {
cb := &CertBundle{
RootCertPath: rootCA,
RootKeyPath: rootKey,
LeafCertPath: path.Join(dir, "leaf.cert"),
LeafKeyPath: path.Join(dir, "leaf.key"),
}
// load the root key
rk := &crypto.PrivateKey{}
err := rk.ReadFile(cb.RootKeyPath)
if err != nil {
return nil, err
}
// load the ca
ca := &crypto.X509{}
err = ca.ReadFile(cb.RootCertPath)
if err != nil {
return nil, err
}
// generate a local cert
k, err := crypto.GenerateKeyPair()
if err != nil {
return nil, err
}
os.Remove(cb.LeafKeyPath)
err = k.Private.WriteFile(cb.LeafKeyPath)
if err != nil {
return nil, err
}
hosts := []string{"localhost", "*.shipyard.run", c.options.GrpcBind}
hosts = append(hosts, host...)
lc, err := crypto.GenerateLeaf(
ips,
hosts,
ca,
rk,
k.Private)
if err != nil {
return nil, err
}
os.Remove(cb.LeafCertPath)
err = lc.WriteFile(cb.LeafCertPath)
if err != nil {
return nil, err
}
return cb, nil
}
// ExposeService allows you to expose a local or remote
// service with another connector
func (c *ConnectorImpl) ExposeService(
name string,
port int,
remoteAddr string,
destAddr string,
direction string,
) (string, error) {
dir := utils.CertsDir("")
cb, err := c.GetLocalCertBundle(dir)
if err != nil {
return "", fmt.Errorf("Unable to find certificate at location: %s, error: %s", dir, err)
}
cl, err := getClient(cb, c.options.GrpcBind)
if err != nil {
return "", fmt.Errorf("Unable to create grpc client: %s", err)
}
t := shipyard.ServiceType_LOCAL
if direction == "remote" {
t = shipyard.ServiceType_REMOTE
}
r := &shipyard.ExposeRequest{}
r.Service = &shipyard.Service{
Name: name,
RemoteConnectorAddr: remoteAddr,
DestinationAddr: destAddr,
SourcePort: int32(port),
Type: t,
}
er, err := cl.ExposeService(context.Background(), r)
if err != nil {
return "", err
}
return er.Id, nil
}
// RemoveService removes a previously exposed service
func (c *ConnectorImpl) RemoveService(id string) error {
cb, err := c.GetLocalCertBundle(utils.CertsDir(""))
if err != nil {
return err
}
cl, err := getClient(cb, c.options.GrpcBind)
if err != nil {
return err
}
r := &shipyard.DestroyRequest{}
r.Id = id
_, err = cl.DestroyService(context.Background(), r)
if err != nil {
return err
}
return nil
}
// ListServices lists all active services
func (c *ConnectorImpl) ListServices() ([]*shipyard.Service, error) {
cb, err := c.GetLocalCertBundle(utils.CertsDir(""))
if err != nil {
return nil, err
}
cl, err := getClient(cb, c.options.GrpcBind)
if err != nil {
return nil, err
}
lr, err := cl.ListServices(context.Background(), &shipyard.NullMessage{})
if err != nil {
return nil, err
}
return lr.Services, nil
}
func getClient(cert *CertBundle, uri string) (shipyard.RemoteConnectionClient, error) {
// if we are using TLS create a TLS client
certificate, err := tls.LoadX509KeyPair(cert.LeafCertPath, cert.LeafKeyPath)
if err != nil {
return nil, err
}
// Create a certificate pool from the certificate authority
certPool := x509.NewCertPool()
ca, err := ioutil.ReadFile(cert.RootCertPath)
if err != nil {
return nil, err
}
ok := certPool.AppendCertsFromPEM(ca)
if !ok {
return nil, fmt.Errorf("unable to append certs from ca pem")
}
creds := credentials.NewTLS(&tls.Config{
ServerName: uri,
Certificates: []tls.Certificate{certificate},
RootCAs: certPool,
})
_ = creds
// Create a connection with the TLS credentials
conn, err := grpc.Dial(uri, grpc.WithTransportCredentials(creds))
if err != nil {
return nil, err
}
rc := shipyard.NewRemoteConnectionClient(conn)
return rc, nil
}