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Original file line number | Diff line number | Diff line change |
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@@ -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 | ||
) | ||
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||
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" | ||
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"github.com/quic-go/quic-go/http3" | ||
"github.com/yosida95/uritemplate/v3" | ||
) | ||
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// 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") | ||
} | ||
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u, err := url.Parse(template.Raw()) | ||
if err != nil { | ||
return nil, nil, fmt.Errorf("connect-ip: failed to parse URI: %w", err) | ||
} | ||
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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") | ||
} | ||
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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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