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+ GNU GENERAL PUBLIC LICENSE
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- /dev/null
+/*
+Copyright (C) 2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+ "bytes"
+ "context"
+ "crypto"
+ "crypto/sha256"
+ "crypto/tls"
+ "crypto/x509"
+ "encoding/hex"
+ "flag"
+ "fmt"
+ "io"
+ "log"
+ "net"
+ "net/http"
+ "os/exec"
+ "strings"
+ "sync"
+ "time"
+
+ "github.com/dustin/go-humanize"
+ "go.cypherpunks.ru/ucspi"
+)
+
+var (
+ tlsNextProtoS = make(map[string]func(*http.Server, *tls.Conn, http.Handler))
+ tlsNextProtoC = make(map[string]func(string, *tls.Conn) http.RoundTripper)
+ caCert *x509.Certificate
+ caPrv crypto.PrivateKey
+ certs *string
+ dnsSrv *string
+ transport = http.Transport{
+ ForceAttemptHTTP2: false,
+ DisableKeepAlives: true,
+ MaxIdleConnsPerHost: 2,
+ TLSNextProto: tlsNextProtoC,
+ DialTLSContext: dialTLS,
+ }
+
+ accepted = make(map[string]string)
+ acceptedM sync.RWMutex
+ rejected = make(map[string]string)
+ rejectedM sync.RWMutex
+)
+
+func spkiHash(cert *x509.Certificate) string {
+ hsh := sha256.Sum256(cert.RawSubjectPublicKeyInfo)
+ return hex.EncodeToString(hsh[:])
+}
+
+func certInfo(certRaw []byte) string {
+ cmd := exec.Command("certtool", "--certificate-info", "--inder")
+ cmd.Stdin = bytes.NewReader(certRaw)
+ out, err := cmd.Output()
+ if err == nil {
+ return string(out)
+ }
+ return err.Error()
+}
+
+func acceptedAdd(addr, h string) {
+ acceptedM.Lock()
+ accepted[addr] = h
+ acceptedM.Unlock()
+}
+
+func rejectedAdd(addr, h string) {
+ rejectedM.Lock()
+ rejected[addr] = h
+ rejectedM.Unlock()
+}
+
+type ErrRejected struct {
+ addr string
+}
+
+func (err ErrRejected) Error() string { return err.addr + " was rejected" }
+
+func dialTLS(ctx context.Context, network, addr string) (net.Conn, error) {
+ host := strings.TrimSuffix(addr, ":443")
+ cfg := tls.Config{
+ VerifyPeerCertificate: func(
+ rawCerts [][]byte,
+ verifiedChains [][]*x509.Certificate,
+ ) error {
+ return verifyCert(host, nil, rawCerts, verifiedChains)
+ },
+ }
+ conn, dialErr := tls.Dial(network, addr, &cfg)
+ if dialErr != nil {
+ if _, ok := dialErr.(ErrRejected); ok {
+ return nil, dialErr
+ }
+ cfg.InsecureSkipVerify = true
+ cfg.VerifyPeerCertificate = func(
+ rawCerts [][]byte,
+ verifiedChains [][]*x509.Certificate,
+ ) error {
+ return verifyCert(host, dialErr, rawCerts, verifiedChains)
+ }
+ var err error
+ conn, err = tls.Dial(network, addr, &cfg)
+ if err != nil {
+ sinkErr <- fmt.Sprintf("%s\t%s", addr, dialErr.Error())
+ return nil, err
+ }
+ }
+ connState := conn.ConnectionState()
+ sinkTLS <- fmt.Sprintf(
+ "%s\t%s %s\t%s",
+ strings.TrimSuffix(addr, ":443"),
+ ucspi.TLSVersion(connState.Version),
+ tls.CipherSuiteName(connState.CipherSuite),
+ spkiHash(connState.PeerCertificates[0]),
+ )
+ return conn, nil
+}
+
+func roundTrip(w http.ResponseWriter, req *http.Request) {
+ if req.Method == http.MethodHead {
+ http.Error(w, "go away", http.StatusMethodNotAllowed)
+ return
+ }
+ sinkReq <- fmt.Sprintf("%s %s", req.Method, req.URL.String())
+ host := strings.TrimSuffix(req.URL.Host, ":443")
+ for _, spy := range SpyDomains {
+ if strings.HasSuffix(host, spy) {
+ http.NotFound(w, req)
+ sinkOther <- fmt.Sprintf(
+ "%s %s\t%d\tspy one",
+ req.Method,
+ req.URL.String(),
+ http.StatusNotFound,
+ )
+ return
+ }
+ }
+ if strings.HasPrefix(req.URL.Host, "www.reddit.com") {
+ req.URL.Host = "old.reddit.com"
+ http.Redirect(w, req, req.URL.String(), http.StatusMovedPermanently)
+ return
+ }
+ resp, err := transport.RoundTrip(req)
+ if err != nil {
+ sinkErr <- fmt.Sprintf("%s\t%s", req.URL.Host, err.Error())
+ w.WriteHeader(http.StatusBadGateway)
+ w.Write([]byte(err.Error()))
+ return
+ }
+ for k, vs := range resp.Header {
+ if k == "Location" || k == "Content-Type" || k == "Content-Length" {
+ continue
+ }
+ for _, v := range vs {
+ w.Header().Add(k, v)
+ }
+ }
+ if req.Method == http.MethodGet {
+ var redirType string
+ switch resp.StatusCode {
+ case http.StatusMovedPermanently, http.StatusPermanentRedirect:
+ redirType = "permanent"
+ goto Redir
+ case http.StatusFound, http.StatusSeeOther, http.StatusTemporaryRedirect:
+ if strings.Contains(req.Header.Get("User-Agent"), "newsboat/") {
+ goto NoRedir
+ }
+ redirType = "temporary"
+ default:
+ goto NoRedir
+ }
+ Redir:
+ resp.Body.Close()
+ w.Header().Add("Content-Type", "text/html")
+ w.WriteHeader(http.StatusOK)
+ location := resp.Header.Get("Location")
+ w.Write([]byte(
+ fmt.Sprintf(
+ `<html>
+<head><title>%d %s: %s redirection</title></head>
+<body>Redirection to <a href="%s">%s</a>
+</body></html>`,
+ resp.StatusCode, http.StatusText(resp.StatusCode),
+ redirType, location, location,
+ )))
+ sinkRedir <- fmt.Sprintf(
+ "%s %s\t%s\t%s", req.Method, resp.Status, req.URL.String(), location,
+ )
+ return
+ }
+NoRedir:
+ for _, h := range []string{"Location", "Content-Type", "Content-Length"} {
+ if v := resp.Header.Get(h); v != "" {
+ w.Header().Add(h, v)
+ }
+ }
+ w.WriteHeader(resp.StatusCode)
+ n, err := io.Copy(w, resp.Body)
+ if err != nil {
+ log.Printf("Error during %s: %+v\n", req.URL, err)
+ }
+ resp.Body.Close()
+ msg := fmt.Sprintf(
+ "%s %s\t%s\t%s\t%s",
+ req.Method,
+ req.URL.String(),
+ resp.Status,
+ resp.Header.Get("Content-Type"),
+ humanize.IBytes(uint64(n)),
+ )
+ if resp.StatusCode == http.StatusOK {
+ sinkOK <- msg
+ } else {
+ sinkOther <- msg
+ }
+}
+
+type Handler struct{}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ if req.Method != http.MethodConnect {
+ roundTrip(w, req)
+ return
+ }
+ hj, ok := w.(http.Hijacker)
+ if !ok {
+ log.Fatalln("no hijacking")
+ }
+ conn, _, err := hj.Hijack()
+ if err != nil {
+ log.Fatalln(err)
+ }
+ defer conn.Close()
+ conn.Write([]byte(fmt.Sprintf(
+ "%s %d %s\r\n\r\n",
+ req.Proto,
+ http.StatusOK, http.StatusText(http.StatusOK),
+ )))
+ host := strings.Split(req.Host, ":")[0]
+ hostCertsM.Lock()
+ keypair, ok := hostCerts[host]
+ if !ok || !keypair.cert.NotAfter.After(time.Now().Add(time.Hour)) {
+ keypair = newKeypair(host, caCert, caPrv)
+ hostCerts[host] = keypair
+ }
+ hostCertsM.Unlock()
+ tlsConn := tls.Server(conn, &tls.Config{
+ Certificates: []tls.Certificate{{
+ Certificate: [][]byte{keypair.cert.Raw},
+ PrivateKey: keypair.prv,
+ }},
+ })
+ if err = tlsConn.Handshake(); err != nil {
+ log.Printf("TLS error %s: %+v\n", host, err)
+ return
+ }
+ srv := http.Server{
+ Handler: &HTTPSHandler{host: req.Host},
+ TLSNextProto: tlsNextProtoS,
+ }
+ err = srv.Serve(&SingleListener{conn: tlsConn})
+ if err != nil {
+ if _, ok := err.(AlreadyAccepted); !ok {
+ log.Printf("TLS serve error %s: %+v\n", host, err)
+ return
+ }
+ }
+}
+
+type HTTPSHandler struct {
+ host string
+}
+
+func (h *HTTPSHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ req.URL.Scheme = "https"
+ req.URL.Host = h.host
+ roundTrip(w, req)
+}
+
+func main() {
+ crtPath := flag.String("cert", "cert.pem", "Path to server X.509 certificate")
+ prvPath := flag.String("key", "prv.pem", "Path to server PKCS#8 private key")
+ bind := flag.String("bind", "[::1]:8080", "Bind address")
+ certs = flag.String("certs", "certs", "Directory with pinned certificates")
+ dnsSrv = flag.String("dns", "[::1]:53", "DNS server")
+ fifos = flag.String("fifos", "fifos", "Directory with FIFOs")
+ notai = flag.Bool("notai", false, "Do not prepend TAI64N to logs")
+ flag.Parse()
+ log.SetFlags(log.Lshortfile)
+ fifoInit()
+
+ var err error
+ _, caCert, err = ucspi.CertificateFromFile(*crtPath)
+ if err != nil {
+ log.Fatalln(err)
+ }
+ caPrv, err = ucspi.PrivateKeyFromFile(*prvPath)
+ if err != nil {
+ log.Fatalln(err)
+ }
+
+ ln, err := net.Listen("tcp", *bind)
+ if err != nil {
+ log.Fatalln(err)
+ }
+ srv := http.Server{
+ Handler: &Handler{},
+ TLSNextProto: tlsNextProtoS,
+ }
+ srv.SetKeepAlivesEnabled(false)
+ log.Println("listening:", *bind)
+ if err := srv.Serve(ln); err != nil {
+ log.Fatalln(err)
+ }
+}