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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package connectip | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "crypto/x509/pkix" | ||
| "log" | ||
| "math/big" | ||
| "time" | ||
|
|
||
| "github.com/quic-go/quic-go/http3" | ||
| ) | ||
|
|
||
| var ( | ||
| tlsConf *tls.Config | ||
| certPool *x509.CertPool | ||
| ) | ||
|
|
||
| func generateCA() (*x509.Certificate, *rsa.PrivateKey, error) { | ||
| certTempl := &x509.Certificate{ | ||
| SerialNumber: big.NewInt(2019), | ||
| Subject: pkix.Name{}, | ||
| NotBefore: time.Now(), | ||
| NotAfter: time.Now().Add(24 * time.Hour), | ||
| IsCA: true, | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, | ||
| KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign, | ||
| BasicConstraintsValid: true, | ||
| } | ||
| caPrivateKey, err := rsa.GenerateKey(rand.Reader, 2048) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| caBytes, err := x509.CreateCertificate(rand.Reader, certTempl, certTempl, &caPrivateKey.PublicKey, caPrivateKey) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| ca, err := x509.ParseCertificate(caBytes) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| return ca, caPrivateKey, nil | ||
| } | ||
|
|
||
| func generateLeafCert(ca *x509.Certificate, caPrivateKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey, error) { | ||
| certTempl := &x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| DNSNames: []string{"localhost", "127.0.0.1"}, | ||
| NotBefore: time.Now(), | ||
| NotAfter: time.Now().Add(24 * time.Hour), | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, | ||
| KeyUsage: x509.KeyUsageDigitalSignature, | ||
| } | ||
| privKey, err := rsa.GenerateKey(rand.Reader, 2048) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| certBytes, err := x509.CreateCertificate(rand.Reader, certTempl, ca, &privKey.PublicKey, caPrivateKey) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| cert, err := x509.ParseCertificate(certBytes) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| return cert, privKey, nil | ||
| } | ||
|
|
||
| func init() { | ||
| ca, caPrivateKey, err := generateCA() | ||
| if err != nil { | ||
| log.Fatal("failed to generate CA certificate:", err) | ||
| } | ||
| leafCert, leafPrivateKey, err := generateLeafCert(ca, caPrivateKey) | ||
| if err != nil { | ||
| log.Fatal("failed to generate leaf certificate:", err) | ||
| } | ||
| certPool = x509.NewCertPool() | ||
| certPool.AddCert(ca) | ||
| tlsConf = &tls.Config{ | ||
| Certificates: []tls.Certificate{{ | ||
| Certificate: [][]byte{leafCert.Raw}, | ||
| PrivateKey: leafPrivateKey, | ||
| }}, | ||
| NextProtos: []string{http3.NextProtoH3}, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package connectip | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
| "net/url" | ||
|
|
||
| "github.com/quic-go/quic-go/http3" | ||
| "github.com/yosida95/uritemplate/v3" | ||
| ) | ||
|
|
||
| // Dial dials a proxied connection to a target server. | ||
| func Dial(ctx context.Context, conn *http3.ClientConn, template *uritemplate.Template) (*Conn, *http.Response, error) { | ||
| if len(template.Varnames()) > 0 { | ||
| return nil, nil, errors.New("connect-ip-go currently does not support IP flow forwarding") | ||
| } | ||
|
|
||
| u, err := url.Parse(template.Raw()) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("connect-ip: failed to parse URI: %w", err) | ||
| } | ||
|
|
||
| select { | ||
| case <-ctx.Done(): | ||
| return nil, nil, context.Cause(ctx) | ||
| case <-conn.Context().Done(): | ||
| return nil, nil, context.Cause(conn.Context()) | ||
| case <-conn.ReceivedSettings(): | ||
| } | ||
| settings := conn.Settings() | ||
| if !settings.EnableExtendedConnect { | ||
| return nil, nil, errors.New("connect-ip: server didn't enable Extended CONNECT") | ||
| } | ||
| if !settings.EnableDatagrams { | ||
| return nil, nil, errors.New("connect-ip: server didn't enable Datagrams") | ||
| } | ||
|
|
||
| rstr, err := conn.OpenRequestStream(ctx) | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("connect-ip: failed to open request stream: %w", err) | ||
| } | ||
| if err := rstr.SendRequestHeader(&http.Request{ | ||
| Method: http.MethodConnect, | ||
| Proto: requestProtocol, | ||
| Host: u.Host, | ||
| Header: http.Header{capsuleHeader: []string{capsuleProtocolHeaderValue}}, | ||
| URL: u, | ||
| }); err != nil { | ||
| return nil, nil, fmt.Errorf("connect-ip: failed to send request: %w", err) | ||
| } | ||
| // TODO: optimistically return the connection | ||
| rsp, err := rstr.ReadResponse() | ||
| if err != nil { | ||
| return nil, nil, fmt.Errorf("connect-ip: failed to read response: %w", err) | ||
| } | ||
| if rsp.StatusCode < 200 || rsp.StatusCode > 299 { | ||
| return nil, rsp, fmt.Errorf("connect-ip: server responded with %d", rsp.StatusCode) | ||
| } | ||
| return newProxiedConn(rstr), rsp, nil | ||
| } | ||
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