first commit

demo.crt

@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----
+MIID3TCCAsWgAwIBAgIUNs/bkWG+0hoVIpnfHEAFvyiPQAIwDQYJKoZIhvcNAQEL
+BQAwfjELMAkGA1UEBhMCREUxEDAOBgNVBAgMB0dlcm1hbnkxFzAVBgNVBAcMDkhh
+bHRlcm4gQW0gU2VlMRAwDgYDVQQKDAdKYWtvYnVzMRIwEAYDVQQDDAlyaXNjaC5k
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+XxhL7WbR4XCeESk5WVRou00+p/o62HpIhspYzWhFWTJS
+-----END CERTIFICATE-----

demo.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCz4AUvRbxSWud+
+NKLWZOG3W8BZrg1n5kEWjKnQ1fqFD/4aloHUMS3eCkg3gbOfVXQMMcPxkGeE8ewi
+3/Y169mXI2EXu2JOBLmA4egcB5RJv8ROO5jSd4B/DmZVT95w3QEvUagKEJ8riHLO
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+lj9ATqpUlJPiuR4noNHd0/4Vqm+k9e1mA2QT2qbSKJW/twGtOzhSjNr9c+KqD8If
+mTdDdjZ/AgMBAAECggEAGsHJaPxJz223/4VAmdLSOW57wPthVszLbtlyzglz5YT5
+ACcrszmzldLYEPBex2YJ8rcZFjSBvvwma75UB4uzckZFhFG6sFoHPDLz+O4Zsr9v
+f1G3NyD8ANUkB4RvgEDSkyGQSnBUNRYW5KJc2vZLHpBOdcZDhQ0718oIwe+OJfqQ
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+qpaEO4mZ6E9UnZw79TKepL/0viBnqZB0AavPdp88Feg8euwu/z7mGji45etq7c7L
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+uhJXC6y8aQKBgQCkMiKkvP+sdT/BeqV90HoLCDFVHOPZB1Nezl4SoCDPm9Bejktg
+y1Mzz1UxJURA0eoIcJ+yAi7Nd8MnLnOQ0oe45tZwYSnryWu1i2ZRol8pwmUj1oec
+HKqclfkMM9txhAZMSNG20C8Vo7ujn21HqAQpyS2LIKRsGPWCnl49+OTD6QKBgG2f
+4cF7HIa7fHPTKgvMWT6YLwwm6psOSGaDmvqzOzp/4V8DGYDQhueAb8Xcu3Q2t1Mx
+dEmbfP3Rbd7L2RmhzCv8wOAecCFFjk2rWcT1VWm7GBmOvNfoyabqMam5/R9Dl+DO
+NHNxaN3L/H9Pmnc5uYgzSpAdD9Qi38D0pI4NxRfxAoGAIv7GlbBktH/EvlxeZ8dX
+RCl5iyHJ8ke6mXaG4cNceoWy8pGw1GquJmnW1jZK3mCtTQ0kE0z89VyKreMcB8Gh
+AS2DqwJ2MY3z7m9RXqreLQuzeTHQPOU6GcP9V+m88OT6IoeoraHMuzawp/C5hack
+tOyj0B3anEXqdaXYgenMoPw=
+-----END PRIVATE KEY-----

go.mod

@@ -0,0 +1,10 @@
+module de.webproxy
+
+go 1.25.4
+
+require (
+	github.com/AdguardTeam/golibs v0.4.0 // indirect
+	github.com/AdguardTeam/gomitmproxy v0.2.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	golang.org/x/text v0.3.2 // indirect
+)

go.sum

@@ -0,0 +1,23 @@
+github.com/AdguardTeam/golibs v0.4.0 h1:4VX6LoOqFe9p9Gf55BeD8BvJD6M6RDYmgEiHrENE9KU=
+github.com/AdguardTeam/golibs v0.4.0/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4=
+github.com/AdguardTeam/gomitmproxy v0.2.1 h1:p9gr8Er1TYvf+7ic81Ax1sZ62UNCsMTZNbm7tC59S9o=
+github.com/AdguardTeam/gomitmproxy v0.2.1/go.mod h1:Qdv0Mktnzer5zpdpi5rAwixNJzW2FN91LjKJCkVbYGU=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -0,0 +1,183 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/AdguardTeam/golibs/log"
+	"github.com/AdguardTeam/gomitmproxy"
+	"github.com/AdguardTeam/gomitmproxy/mitm"
+	"github.com/AdguardTeam/gomitmproxy/proxyutil"
+
+	_ "net/http/pprof"
+)
+
+func main() {
+	log.SetLevel(log.DEBUG)
+
+	go func() {
+		log.Println(http.ListenAndServe("localhost:6060", nil))
+	}()
+
+	// Read the MITM cert and key.
+	tlsCert, err := tls.LoadX509KeyPair("demo.crt", "demo.key")
+	if err != nil {
+		log.Fatal(err)
+	}
+	privateKey := tlsCert.PrivateKey.(*rsa.PrivateKey)
+
+	x509c, err := x509.ParseCertificate(tlsCert.Certificate[0])
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	mitmConfig, err := mitm.NewConfig(x509c, privateKey, &CustomCertsStorage{
+		certsCache: map[string]*tls.Certificate{}},
+	)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Generate certs valid for 7 days.
+	mitmConfig.SetValidity(time.Hour * 24 * 7)
+	// Set certs organization.
+	mitmConfig.SetOrganization("Jakobus")
+
+	// Generate a cert-key pair for the HTTP-over-TLS proxy.
+	/*proxyCert, err := mitmConfig.GetOrCreateCert("127.0.0.1")
+	if err != nil {
+		panic(err)
+	}
+	/*tlsConfig := &tls.Config{
+	Certificates: []tls.Certificate{*proxyCert},
+	}*/
+
+	// Prepare the proxy.
+	addr := &net.TCPAddr{
+		IP:   net.IPv4(0, 0, 0, 0),
+		Port: 3333,
+	}
+
+	proxy := gomitmproxy.NewProxy(gomitmproxy.Config{
+		ListenAddr: addr,
+
+		MITMConfig:     mitmConfig,
+		MITMExceptions: []string{"example.com"},
+
+		OnRequest:  onRequest,
+		OnResponse: onResponse,
+		OnConnect:  onConnect,
+	})
+
+	err = proxy.Start()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	signalChannel := make(chan os.Signal, 1)
+	signal.Notify(signalChannel, syscall.SIGINT, syscall.SIGTERM)
+	<-signalChannel
+
+	// Stop the proxy.
+	proxy.Close()
+}
+
+func onRequest(session *gomitmproxy.Session) (*http.Request, *http.Response) {
+	req := session.Request()
+
+	log.Printf("onRequest: %s %s", req.Method, req.URL.String())
+
+	if req.URL.Host == "testgomitmproxy" {
+		body := strings.NewReader("<html><body><h1>Served by gomitmproxy</h1></body></html>")
+		res := proxyutil.NewResponse(http.StatusOK, body, req)
+		res.Header.Set("Content-Type", "text/html")
+		return nil, res
+	}
+
+	return nil, req.Response
+}
+
+func onResponse(session *gomitmproxy.Session) *http.Response {
+	log.Printf("onResponse: %s", session.Request().URL.String())
+
+	if _, ok := session.GetProp("blocked"); ok {
+		log.Printf("onResponse: was blocked")
+		return nil
+	}
+
+	res := session.Response()
+	req := session.Request()
+
+	if strings.Index(res.Header.Get("Content-Type"), "text/html") != 0 {
+		// Do nothing with non-HTML responses
+		return nil
+	}
+
+	b, err := proxyutil.ReadDecompressedBody(res)
+	// Close the original body.
+	_ = res.Body.Close()
+	if err != nil {
+		return proxyutil.NewErrorResponse(req, err)
+	}
+
+	// Use latin1 before modifying the body. Using this 1-byte encoding will
+	// let us preserve all original characters regardless of what exactly is
+	// the encoding.
+	body, err := proxyutil.DecodeLatin1(bytes.NewReader(b))
+	if err != nil {
+		return proxyutil.NewErrorResponse(session.Request(), err)
+	}
+
+	// Modifying the original body.
+	modifiedBody, err := proxyutil.EncodeLatin1(body + "")
+	if err != nil {
+		return proxyutil.NewErrorResponse(session.Request(), err)
+	}
+	println("Modified body123:" + string(modifiedBody))
+
+	res.Body = io.NopCloser(bytes.NewReader(modifiedBody))
+	res.Header.Del("Content-Encoding")
+	res.ContentLength = int64(len(modifiedBody))
+
+	return res
+}
+
+func onConnect(_ *gomitmproxy.Session, _ string, addr string) (conn net.Conn) {
+	host, _, err := net.SplitHostPort(addr)
+
+	if err == nil && host == "testgomitmproxy" {
+		// Don't let it connecting there, we'll serve it by ourselves.
+		return &proxyutil.NoopConn{}
+	}
+
+	return nil
+}
+
+// CustomCertsStorage is an example of a custom cert storage.
+type CustomCertsStorage struct {
+	// certsCache is a cache with the generated certificates.
+	certsCache map[string]*tls.Certificate
+}
+
+// Get gets the certificate from the storage.
+func (c *CustomCertsStorage) Get(key string) (cert *tls.Certificate, ok bool) {
+	cert, ok = c.certsCache[key]
+
+	return cert, ok
+}
+
+// Set saves the certificate to the storage.
+func (c *CustomCertsStorage) Set(key string, cert *tls.Certificate) {
+	c.certsCache[key] = cert
+}

server.pem

@@ -0,0 +1,51 @@
+-----BEGIN CERTIFICATE-----
+MIID3TCCAsWgAwIBAgIUNs/bkWG+0hoVIpnfHEAFvyiPQAIwDQYJKoZIhvcNAQEL
+BQAwfjELMAkGA1UEBhMCREUxEDAOBgNVBAgMB0dlcm1hbnkxFzAVBgNVBAcMDkhh
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+XxhL7WbR4XCeESk5WVRou00+p/o62HpIhspYzWhFWTJS
+-----END CERTIFICATE-----
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCz4AUvRbxSWud+
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+RCl5iyHJ8ke6mXaG4cNceoWy8pGw1GquJmnW1jZK3mCtTQ0kE0z89VyKreMcB8Gh
+AS2DqwJ2MY3z7m9RXqreLQuzeTHQPOU6GcP9V+m88OT6IoeoraHMuzawp/C5hack
+tOyj0B3anEXqdaXYgenMoPw=
+-----END PRIVATE KEY-----