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client.go
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client.go
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package client
import (
"bytes"
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/binary"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io"
"log"
"net"
"net/http"
"net/url"
"os"
"os/exec"
"os/signal"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/borderzero/border0-cli/internal/api"
"github.com/borderzero/border0-cli/internal/client/password"
"github.com/borderzero/border0-cli/internal/util"
jwt "github.com/golang-jwt/jwt"
"github.com/moby/term"
"github.com/pavlo-v-chernykh/keystore-go/v4"
"go.uber.org/zap"
"golang.org/x/crypto/ssh"
"nhooyr.io/websocket"
)
var (
ErrProxyHandshakeFailed = errors.New("failed to authenticate against Border0 proxy")
ErrConnectorHandshakeFailed = errors.New("failed to authenticate against connector")
)
const (
successURL = "https://www.border0.com/logged-in"
failURL = "https://www.border0.com/fail-message"
wsProxyToOriginHeader = "https://client.border0.com"
defaultWSProxy = "wss://ws.border0.com/ws"
defaultDialTimeout = 3000 * time.Millisecond //timeout for dialing the target host and fall back to websocket
)
func CheckIfTokenIsExpired(rawToken string) bool {
tempJWT, _ := jwt.Parse(rawToken, nil)
if tempJWT != nil {
claims := tempJWT.Claims.(jwt.MapClaims)
if expfloat, ok := claims["exp"]; ok {
exp := int64(expfloat.(float64))
if exp-10 > time.Now().Unix() {
return false
}
} else {
// no expiry, allow through if service account token
if _, ok := claims["service_account_id"]; ok {
return false
}
}
}
return true
}
func MTLSLogin(logger *zap.Logger, hostname string) (string, jwt.MapClaims, error) {
if hostname == "" {
return "", nil, errors.New("empty hostname not allowed")
}
tokenFile := MTLSTokenFile()
var token string
if os.Getenv("BORDER0_CLIENT_TOKEN") != "" {
token = os.Getenv("BORDER0_CLIENT_TOKEN")
if CheckIfTokenIsExpired(token) {
// verify if our os.variable supplied token is not expired, error out if it is
return "", nil, errors.New("token from environment variable BORDER0_CLIENT_TOKEN is expired")
}
} else {
if _, err := os.Stat(tokenFile); err == nil {
content, _ := os.ReadFile(tokenFile)
tokenString := strings.TrimRight(string(content), "\n")
if CheckIfTokenIsExpired(tokenString) {
// token is expired, we rely on refresh logic
token = ""
} else {
// assing the token variable from token file
token = tokenString
}
}
}
_, err := FetchResource(token, hostname)
if err != nil {
if errors.Is(err, ErrResourceNotFound) {
return "", nil, err
}
token = ""
}
if token == "" {
listener, err := net.Listen("tcp", "localhost:")
if err != nil {
return "", nil, fmt.Errorf("unable to start local http listener: %w", err)
}
localPort := listener.Addr().(*net.TCPAddr).Port
url := fmt.Sprintf("%s/mtls-ca/socket/%s/auth?port=%d", api.APIURL(), hostname, localPort)
token = Launch(logger, url, listener)
// create dir if not exists
configPath := filepath.Dir(tokenFile)
if _, err := os.Stat(configPath); os.IsNotExist(err) {
if err := os.Mkdir(configPath, 0700); err != nil {
return "", nil, fmt.Errorf("failed to create directory %s : %w", configPath, err)
}
}
f, err := os.Create(tokenFile)
if err != nil {
return "", nil, fmt.Errorf("failed to create token: %w", err)
}
if err = os.Chmod(tokenFile, 0600); err != nil {
return "", nil, fmt.Errorf("failed to write token: %w", err)
}
defer f.Close()
if _, err = f.WriteString(fmt.Sprintf("%s\n", token)); err != nil {
return "", nil, fmt.Errorf("failed to write token: %w", err)
}
}
parsedJWT, err := jwt.Parse(token, nil)
if parsedJWT == nil {
return "", nil, fmt.Errorf("couldn't parse token: %w", err)
}
claims := parsedJWT.Claims.(jwt.MapClaims)
_, userEmailOK := claims["user_email"]
_, serviceAccountIdOK := claims["service_account_id"]
if !userEmailOK && !serviceAccountIdOK {
return "", nil, errors.New("can't find claim for user_email nor service_account_id")
}
if _, ok := claims["org_id"]; !ok {
return "", nil, errors.New("can't find claim for org_id")
}
if token == "" {
return "", nil, errors.New("login failed")
}
return token, claims, nil
}
func ReadOrgCert(orgID string) (cert *x509.Certificate, key *rsa.PrivateKey, caCert *x509.Certificate, crtPath string, keyPath, caPath string, err error) {
home, err := util.GetUserHomeDir()
if err != nil {
err = fmt.Errorf("error: failed to get homedir : %w", err)
return
}
caPath = filepath.Join(home, ".border0", orgID+"-ca.crt")
if _, err = os.Stat(caPath); os.IsNotExist(err) {
err = fmt.Errorf("error: ca certificate file %s not found", caPath)
return
}
crtPath = filepath.Join(home, ".border0", orgID+".crt")
if _, err = os.Stat(crtPath); os.IsNotExist(err) {
err = fmt.Errorf("error: certificate file %s not found", crtPath)
return
}
keyPath = filepath.Join(home, ".border0", orgID+".key")
if _, err = os.Stat(crtPath); os.IsNotExist(err) {
err = fmt.Errorf("error: key file %s not found", keyPath)
return
}
keyPEM, err := os.ReadFile(keyPath)
if err != nil {
err = fmt.Errorf("error: failed to read key file : %w", err)
return
}
keyBlock, _ := pem.Decode(keyPEM)
if keyBlock == nil {
err = fmt.Errorf("error: failed to decode certificate file : %w", err)
return
}
parsedKey, err := x509.ParsePKCS8PrivateKey(keyBlock.Bytes)
if err != nil {
err = fmt.Errorf("error: failed to parse key file : %w", err)
return
}
key, ok := parsedKey.(*rsa.PrivateKey)
if !ok {
err = fmt.Errorf("error: failed to parse key file")
return
}
certPEM, err := os.ReadFile(crtPath)
if err != nil {
err = fmt.Errorf("error: failed to read certificate file : %w", err)
return
}
certBlock, _ := pem.Decode(certPEM)
if certBlock == nil {
err = fmt.Errorf("error: failed to decode certificate file : %w", err)
return
}
cert, err = x509.ParseCertificate(certBlock.Bytes)
if err != nil {
err = fmt.Errorf("error: failed to parse certificate file : %w", err)
return
}
caCertPEM, err := os.ReadFile(caPath)
if err != nil {
err = fmt.Errorf("error: failed to read ca certificate file : %w", err)
return
}
caCertBlock, _ := pem.Decode(caCertPEM)
if caCertBlock == nil {
err = fmt.Errorf("error: failed to decode ca certificate file : %w", err)
return
}
caCert, err = x509.ParseCertificate(caCertBlock.Bytes)
if err != nil {
err = fmt.Errorf("error: failed to parse ca certificate file : %w", err)
return
}
return
}
func WriteCertToFile(cert *CertificateResponse, socketDNS string) (crtPath, keyPath, caPath string, err error) {
home, err := util.GetUserHomeDir()
if err != nil {
err = fmt.Errorf("error: failed to get homedir : %w", err)
return
}
// create dir if not exists
dotDir := filepath.Join(home, ".border0")
if _, err = os.Stat(dotDir); os.IsNotExist(err) {
if err = os.Mkdir(dotDir, 0700); err != nil {
err = fmt.Errorf("error: failed to create directory %s : %w", dotDir, err)
return
}
}
caPath = filepath.Join(dotDir, socketDNS+"-ca.crt")
crtPath = filepath.Join(dotDir, socketDNS+".crt")
keyPath = filepath.Join(dotDir, socketDNS+".key")
if err = os.WriteFile(keyPath, []byte(cert.PrivateKey), 0600); err != nil {
err = fmt.Errorf("error: failed to write key file : %w", err)
return
}
if err = os.WriteFile(crtPath, []byte(cert.Certificate), 0600); err != nil {
err = fmt.Errorf("error: failed to write certificate file : %w", err)
return
}
if err = os.WriteFile(caPath, []byte(cert.CaCertificate), 0600); err != nil {
err = fmt.Errorf("error: failed to write ca certificate file : %w", err)
return
}
return crtPath, keyPath, caPath, nil
}
func GetSocketPort(name string, token string) (socketPort int, err error) {
resource, err := FetchResource(token, name)
if err != nil {
return socketPort, err
}
return resource.SocketPorts[0], nil
}
func OrgIDFromToken() (orgID string) {
tokenfile := MTLSTokenFile()
var token string
if os.Getenv("BORDER0_CLIENT_TOKEN") != "" {
token = os.Getenv("BORDER0_CLIENT_TOKEN")
} else {
if _, err := os.Stat(tokenfile); os.IsNotExist(err) {
return
} else {
content, _ := os.ReadFile(tokenfile)
if err != nil {
return
}
token = strings.TrimRight(string(content), "\n")
}
}
jwtToken, _ := jwt.Parse(token, nil)
if jwtToken != nil {
claims := jwtToken.Claims.(jwt.MapClaims)
if _, ok := claims["org_id"]; ok {
orgID = claims["org_id"].(string)
}
}
return
}
func IsClientCertValid() (crtPath, keyPath string, valid bool) {
orgID := OrgIDFromToken()
if orgID == "" {
return
}
cert, _, _, crtPath, keyPath, _, err := ReadOrgCert(orgID)
if err != nil {
return
}
if time.Now().Before(cert.NotAfter) && time.Now().After(cert.NotBefore) {
valid = true
}
return
}
func FetchCertAndReturnPaths(logger *zap.Logger, hostname string) (crtPath, keyPath, caPath string, err error) {
token, claims, err := MTLSLogin(logger, hostname)
if err != nil {
return
}
userEmail := fmt.Sprint(claims["user_email"])
orgID := fmt.Sprint(claims["org_id"])
cert := GetCert(token, userEmail)
crtPath, keyPath, caPath, err = WriteCertToFile(cert, orgID)
if err != nil {
return
}
return
}
type ResourceInfo struct {
Certficate *x509.Certificate
PrivateKey *rsa.PrivateKey
CaCertificate *x509.Certificate
CertificatePath string
PrivateKeyPath string
CaCertificatePath string
Port int
ConnectorAuthenticationEnabled bool
EndToEndEncryptionEnabled bool
}
func (info *ResourceInfo) SetupTLSCertificate() tls.Certificate {
return tls.Certificate{
Certificate: [][]byte{info.Certficate.Raw},
PrivateKey: info.PrivateKey,
}
}
func GetResourceInfo(logger *zap.Logger, hostname string) (info ResourceInfo, err error) {
var claims jwt.MapClaims
token, claims, err := MTLSLogin(logger, hostname)
if err != nil {
return
}
var ok bool
if info.CertificatePath, info.PrivateKeyPath, ok = IsClientCertValid(); !ok {
info.CertificatePath, info.PrivateKeyPath, info.CaCertificatePath, err = FetchCertAndReturnPaths(logger, hostname)
if err != nil {
return
}
}
resource, err := FetchResource(token, hostname)
if err != nil {
return
}
info.Port = resource.SocketPorts[0]
info.ConnectorAuthenticationEnabled = resource.ConnectorAuthenticationEnabled
info.EndToEndEncryptionEnabled = resource.EndToEndEncryptionEnabled
info.Certficate, info.PrivateKey, info.CaCertificate, _, _, _, err = ReadOrgCert(claims["org_id"].(string))
if err != nil {
return
}
return
}
func MTLSTokenFile() string {
home, err := util.GetUserHomeDir()
if err != nil {
log.Fatalln("Unable to determine the user's home directory", err)
}
if runtime.GOOS == "windows" {
home = os.Getenv("APPDATA")
}
return filepath.Join(home, ".border0/client_token")
}
func Launch(logger *zap.Logger, url string, listener net.Listener) string {
c := make(chan string)
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
url := r.URL
q := url.Query()
w.Header().Set("Content-Type", "text/html")
if q.Get("token") != "" {
w.Header().Set("Location", successURL)
w.WriteHeader(302)
c <- q.Get("token")
} else {
if q.Get("error") == "org_not_found" {
w.Header().Set("Location", failURL)
} else {
w.Header().Set("Location", failURL)
}
w.WriteHeader(302)
c <- ""
}
})
srv := &http.Server{
Handler: mux,
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
defer srv.Shutdown(ctx)
go func() {
if err := srv.Serve(listener); err != nil && err != http.ErrServerClosed {
log.Fatalf("Error: unable to start login process - %s", err)
}
}()
var token string
if openBrowser(url) {
select {
case token = <-c:
if token == "" {
log.Fatalln("Error: login failed")
}
return token
case <-time.After(60 * time.Second):
log.Fatalln("timeout during login")
}
}
if token == "" {
log.Fatalln("Error: login failed")
}
return token
}
func openBrowser(url string) bool {
var args []string
switch runtime.GOOS {
case "darwin":
args = []string{"open"}
case "windows":
args = []string{"cmd", "/c", "start"}
default:
args = []string{"xdg-open"}
}
cmd := exec.Command(args[0], append(args[1:], url)...)
return cmd.Start() == nil
}
type CertificateSigningRequest struct {
Csr string `json:"csr"`
}
type CertificateResponse struct {
PrivateKey string `json:"client_private_key,omitempty"`
Certificate string `json:"client_certificate,omitempty"`
CaCertificate string `json:"ca_certificate,omitempty"`
}
func GetCert(token string, email string) *CertificateResponse {
// generate key
keyBytes, _ := rsa.GenerateKey(rand.Reader, 2048)
// generate csr
template := x509.CertificateRequest{
Subject: pkix.Name{
CommonName: email,
},
EmailAddresses: []string{email},
}
csrBytes, _ := x509.CreateCertificateRequest(rand.Reader, &template, keyBytes)
csrPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE REQUEST", Bytes: csrBytes})
privateKeyBytes, _ := x509.MarshalPKCS8PrivateKey(keyBytes)
privateKey := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: privateKeyBytes})
// sign cert request
jv, _ := json.Marshal(CertificateSigningRequest{Csr: string(csrPem)})
body := bytes.NewBuffer(jv)
req, _ := http.NewRequest("POST", fmt.Sprintf("%s/organizations/csr", api.APIURL()), body)
req.Header.Add("x-access-token", token)
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
log.Fatalf("Error in request: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode == 401 {
log.Fatalln("Error: No valid token, Please login")
}
if resp.StatusCode != 200 {
log.Fatalln("Error: Failed to get cert")
}
cert := &CertificateResponse{}
err = json.NewDecoder(resp.Body).Decode(cert)
if err != nil {
log.Fatalln("Error: Failed to decode certificate")
}
cert.PrivateKey = string(privateKey)
return cert
}
type SSHSignRequest struct {
SSHPublicKey string `json:"ssh_public_key"`
}
type SSHSignResponse struct {
SSHCertSigned string `json:"signed_ssh_cert"`
}
func validSshCert(certFile string, keyFile string) *SSHSignResponse {
if _, err := os.Stat(certFile); os.IsNotExist(err) {
return nil
}
sshCert, err := os.ReadFile(certFile)
if err != nil {
return nil
}
if _, err = os.Stat(keyFile); os.IsNotExist(err) {
return nil
}
sshKeyData, err := os.ReadFile(keyFile)
if err != nil {
return nil
}
sshKey, err := ssh.ParsePrivateKey(sshKeyData)
if err != nil {
return nil
}
pubcert, _, _, _, err := ssh.ParseAuthorizedKey(sshCert)
if err != nil {
return nil
}
cert, ok := pubcert.(*ssh.Certificate)
if !ok {
return nil
}
_, err = ssh.NewCertSigner(cert, sshKey)
if err != nil {
return nil
}
if time.Now().Unix() > int64(cert.ValidAfter) && time.Now().Unix() < int64(cert.ValidBefore) {
return &SSHSignResponse{SSHCertSigned: string(sshCert)}
}
return nil
}
func GenSSHKey(token, orgID, hostname string) (*SSHSignResponse, error) {
_, err := FetchResource(token, hostname)
if err != nil {
return nil, fmt.Errorf("invalid resource: %s", err)
}
home, err := util.GetUserHomeDir()
if err != nil {
return nil, fmt.Errorf("failed to write ssh key: %v", err)
}
// check existing key is still valid
sshCertPath := filepath.Join(home, ".ssh", fmt.Sprintf("%s-cert.pub", orgID))
sshKeyPath := filepath.Join(home, ".ssh", orgID)
sshCert := validSshCert(sshCertPath, sshKeyPath)
if sshCert != nil {
return sshCert, nil
}
if _, err := os.Stat(filepath.Join(home, ".ssh")); os.IsNotExist(err) {
err := os.Mkdir(filepath.Join(home, ".ssh"), 0700)
if err != nil {
return nil, fmt.Errorf("failed to create ssh directory: %s", err)
}
}
// create ssh key
key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, fmt.Errorf("failed to create ssh key: %v", err)
}
parsed, err := x509.MarshalECPrivateKey(key)
if err != nil {
return nil, fmt.Errorf("failed to create ssh key: %v", err)
}
// write key
keyPem := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: parsed})
err = os.WriteFile(sshKeyPath, keyPem, 0600)
if err != nil {
return nil, fmt.Errorf("failed to write ssh key: %v", err)
}
// create public key
pub, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return nil, fmt.Errorf("failed to create public ssh key: %v", err)
}
data := ssh.MarshalAuthorizedKey(pub)
//post signing request
jv, _ := json.Marshal(SSHSignRequest{SSHPublicKey: strings.TrimRight(string(data), "\n")})
body := bytes.NewBuffer(jv)
req, _ := http.NewRequest("POST", fmt.Sprintf("%s/organizations/sign_ssh_key", api.APIURL()), body)
req.Header.Add("x-access-token", token)
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to sign key: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode == 401 {
log.Fatalln("error: no valid token, Please login")
}
if resp.StatusCode != 200 {
log.Fatalln("error: failed to get cert")
}
cert := &SSHSignResponse{}
err = json.NewDecoder(resp.Body).Decode(cert)
if err != nil {
log.Fatalln("error: failed to decode certificate")
}
err = os.WriteFile(sshCertPath, []byte(cert.SSHCertSigned), 0600)
if err != nil {
return nil, fmt.Errorf("failed to write ssh key: %w", err)
}
return cert, nil
}
func ExecCommand(name string, arg ...string) error {
cmd := exec.Command(name, arg...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
func FindWindowsExecutable(parentDir, contains, suffix string) string {
var (
latestPath string
latestModTime time.Time
)
_ = filepath.Walk(parentDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
// Check if path matches the pattern
if strings.Contains(path, contains) && strings.HasSuffix(path, suffix) {
// Found the DataGrip executable
if info.ModTime().After(latestModTime) {
latestPath = path
latestModTime = info.ModTime()
}
}
return nil
})
return latestPath
}
func CertToKeyStore(cert *x509.Certificate, key *rsa.PrivateKey) (ks keystore.KeyStore, pass []byte, err error) {
// for more about keystore and jdbc to mysql connection with ssl, see:
// https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-using-ssl.html
ks = keystore.New()
// privateKeyBlock, _ := pem.Decode([]byte(cert.PrivateKey))
// if privateKeyBlock == nil {
// err = errors.New("private key should have at least one pem block")
// return
// }
// certificateBlock, _ := pem.Decode([]byte(cert.Certificate))
// if certificateBlock == nil {
// err = errors.New("certificate should have at least one pem block")
// return
// }
keyData, err := x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return
}
entry := keystore.PrivateKeyEntry{
CreationTime: time.Now(),
PrivateKey: keyData,
CertificateChain: []keystore.Certificate{
{
Type: "X509",
Content: cert.Raw,
},
},
}
pass = password.KeyStore()
if err = ks.SetPrivateKeyEntry("border0", entry, pass); err != nil {
err = fmt.Errorf("error setting encrypted private key to keystore: %w", err)
return
}
return ks, pass, nil
}
func WriteKeyStore(ks keystore.KeyStore, filename string, password []byte) {
f, err := os.Create(filename)
if err != nil {
log.Fatal(err)
}
defer func() {
if err := f.Close(); err != nil {
log.Fatal(err)
}
}()
err = ks.Store(f, password)
if err != nil {
log.Fatal(err) // nolint: gocritic
}
}
func Zeroing(buf []byte) {
for i := range buf {
buf[i] = 0
}
}
func DownloadCertificateChain(hostname string) (certChainPath string, err error) {
home, err := util.GetUserHomeDir()
if err != nil {
err = fmt.Errorf("failed to get home dir: %w", err)
return
}
certChainPath = filepath.Join(home, ".border0", fmt.Sprintf("%s.chain.crt", hostname))
// now let's download the self-signed root CA cert from letsencrypt.org
httpClient := http.Client{
CheckRedirect: func(r *http.Request, via []*http.Request) error {
r.URL.Opaque = r.URL.Path
return nil
},
Timeout: 10 * time.Second,
}
resp, err := httpClient.Get("https://letsencrypt.org/certs/isrgrootx1.pem")
if err != nil {
err = fmt.Errorf("failed to download root CA cert: %w", err)
return
}
defer resp.Body.Close()
bodyBytes, err := io.ReadAll(resp.Body)
if err != nil {
err = fmt.Errorf("failed to download root CA cert: %w", err)
return
}
if err = os.WriteFile(certChainPath, bodyBytes, 0600); err != nil {
err = fmt.Errorf("failed to write root CA cert to the certificate file: %w", err)
return
}
return
}
// TermSize gets the current window size and returns it in a window-change friendly format.
func TermSize(fd uintptr) []byte {
size := make([]byte, 16)
winsize, err := term.GetWinsize(fd)
if err != nil {
binary.BigEndian.PutUint32(size, uint32(80))
binary.BigEndian.PutUint32(size[4:], uint32(24))
return size
}
binary.BigEndian.PutUint32(size, uint32(winsize.Width))
binary.BigEndian.PutUint32(size[4:], uint32(winsize.Height))
return size
}
func OnInterruptDo(action func()) {
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
go func() {
defer signal.Stop(sigChan)
<-sigChan
action()
os.Exit(1)
}()
}
func StartConnectorAuthListener(hostname string, port int, certificate tls.Certificate, caCertificate *x509.Certificate, localPort int, connectorAuthenticationEnabled bool, endToEndEncryptionEnabled bool, useWsProxy bool) (int, error) {
systemCertPool, err := x509.SystemCertPool()
if err != nil {
return 0, fmt.Errorf("failed to load system cert pool: %w", err)
}
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{certificate},
RootCAs: systemCertPool,
ServerName: hostname,
}
l, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", localPort))
if err != nil {
return 0, fmt.Errorf("unable to start local TLS listener, %s", err)
}
addr := fmt.Sprintf("%s:%d", hostname, port)
go func() {
defer l.Close()
for {
lcon, err := l.Accept()
if err != nil {
log.Fatalf("Listener: Accept Error: %s\n", err)
}
go func() {
conn, err := Connect(addr, false, tlsConfig, certificate, caCertificate, connectorAuthenticationEnabled, endToEndEncryptionEnabled, useWsProxy)
if err != nil {
log.Fatalf("failed to connect: %s\n", err)
}
handleConnection(lcon, conn)
}()
}
}()
return l.Addr().(*net.TCPAddr).Port, nil
}
func Connect(addr string, tlsNeeded bool, tlsConfig *tls.Config, certificate tls.Certificate, caCert *x509.Certificate, connectorAuthenticationEnabled bool, endToEndEncryptionEnabled bool, useWsProxy bool) (net.Conn, error) {
var conn net.Conn
var wsProxyAddr string
if useWsProxy || os.Getenv("BORDER0_WS_PROXY") != "" {
// prefer wsProxy flag over env var
if useWsProxy {
wsProxyAddr = defaultWSProxy
} else {
wsProxyAddr = os.Getenv("BORDER0_WS_PROXY")
}
wsConn, err := ConnectWSProxy(wsProxyAddr, addr)
if err != nil {
return nil, fmt.Errorf("failed to connect to ws proxy: %w", err)
}
conn = wsConn
} else {
netConn, err := net.DialTimeout("tcp", addr, defaultDialTimeout)
if err != nil {
// retry with ws proxy, we'll retry on any error
// This is to handle the case where the proxy is not reachable
// Yay for firewalls and zscalers
// Inform the user that we are falling back to the ws proxy
// and suggest setting the env var to avoid this message
helpString := ""
if runtime.GOOS == "windows" {
helpString = fmt.Sprintf("set BORDER0_WS_PROXY=%s", defaultWSProxy)
} else {
helpString = fmt.Sprintf("export BORDER0_WS_PROXY=%s", defaultWSProxy)
}
fmt.Printf("============ Border0 Connection Notice ============\n"+
"Direct connection failed. This is possibly due to firewall restrictions in your network.\n"+
"Error: %s\n"+
"Falling back to using the Border0 WebSocket proxy.\n"+
"To default to the WebSocket proxy and avoid this message, use --wsproxy or set the BORDER0_WS_PROXY environment variable:\n"+
"%s\n"+
"==================================================\n\n", err.Error(), helpString)
wsConn, err := ConnectWSProxy(defaultWSProxy, addr)
if err != nil {
return nil, fmt.Errorf("failed to connect to ws proxy: %w", err)
}
// return wsConn as conn
conn = wsConn
} else {
conn = netConn
}
}
if tlsNeeded || connectorAuthenticationEnabled || endToEndEncryptionEnabled {
tlsConn := tls.Client(conn, tlsConfig)
if err := tlsConn.Handshake(); err != nil {
return nil, fmt.Errorf("%w: %v", ErrProxyHandshakeFailed, err)
}
conn = tlsConn
}
return connectWithConn(conn, certificate, caCert, connectorAuthenticationEnabled, endToEndEncryptionEnabled)
}
func connectWithConn(conn net.Conn, certificate tls.Certificate, caCert *x509.Certificate, connectorAuthenticationEnabled bool, endToEndEncryptionEnabled bool) (net.Conn, error) {
if !connectorAuthenticationEnabled && !endToEndEncryptionEnabled {
return conn, nil
}
var tlsConfig *tls.Config
if endToEndEncryptionEnabled {
caCertPool := x509.NewCertPool()
caCertPool.AddCert(caCert)
tlsConfig = &tls.Config{
Certificates: []tls.Certificate{certificate},
RootCAs: caCertPool,
InsecureSkipVerify: true,
VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
// Convert raw certs to x509.Certificate
certs := make([]*x509.Certificate, len(rawCerts))
for i, asn1Data := range rawCerts {
cert, err := x509.ParseCertificate(asn1Data)
if err != nil {