From: Sergey Matveev Date: Sat, 4 Sep 2021 20:13:23 +0000 (+0300) Subject: Initial commit X-Git-Tag: v0.1.0~94 X-Git-Url: http://www.git.stargrave.org/?p=tofuproxy.git;a=commitdiff_plain;h=b103a48ba4f6dd5ecad2ece2529c0aadf9680658 Initial commit --- b103a48ba4f6dd5ecad2ece2529c0aadf9680658 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..9a2708d --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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 +. diff --git a/cert.pem.do b/cert.pem.do new file mode 100644 index 0000000..09c82a3 --- /dev/null +++ b/cert.pem.do @@ -0,0 +1,2 @@ +redo-ifchange prv.pem cert.tmpl +certtool --generate-self-signed --load-privkey prv.pem --template cert.tmpl diff --git a/cert.tmpl b/cert.tmpl new file mode 100644 index 0000000..3b4a452 --- /dev/null +++ b/cert.tmpl @@ -0,0 +1,4 @@ +dn = "cn=tofu.localhost" +expiration_days = 365 +ca +cert_signing_key diff --git a/conn.go b/conn.go new file mode 100644 index 0000000..1542abd --- /dev/null +++ b/conn.go @@ -0,0 +1,70 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +package main + +import ( + "net" + "sync" + "time" +) + +type SingleConn struct { + conn net.Conn + ln *SingleListener +} + +func (conn *SingleConn) Read(b []byte) (int, error) { return conn.conn.Read(b) } + +func (conn *SingleConn) Write(b []byte) (int, error) { return conn.conn.Write(b) } + +func (conn *SingleConn) Close() error { + conn.ln.Unlock() + return conn.conn.Close() +} + +func (conn *SingleConn) LocalAddr() net.Addr { return conn.conn.LocalAddr() } + +func (conn *SingleConn) RemoteAddr() net.Addr { return conn.conn.RemoteAddr() } + +func (conn *SingleConn) SetDeadline(t time.Time) error { return conn.conn.SetDeadline(t) } + +func (conn *SingleConn) SetReadDeadline(t time.Time) error { return conn.conn.SetReadDeadline(t) } + +func (conn *SingleConn) SetWriteDeadline(t time.Time) error { return conn.conn.SetWriteDeadline(t) } + +type AlreadyAccepted struct{} + +func (err AlreadyAccepted) Error() string { return "already accepted" } + +type SingleListener struct { + conn net.Conn + accepted bool + sync.Mutex +} + +func (ln *SingleListener) Accept() (net.Conn, error) { + ln.Lock() + if ln.accepted { + return nil, AlreadyAccepted{} + } + ln.accepted = true + return &SingleConn{ln.conn, ln}, nil +} + +func (ln *SingleListener) Close() error { return nil } + +func (ln *SingleListener) Addr() net.Addr { return ln.conn.LocalAddr() } diff --git a/dane.go b/dane.go new file mode 100644 index 0000000..2b850d8 --- /dev/null +++ b/dane.go @@ -0,0 +1,84 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +package main + +import ( + "crypto/sha256" + "crypto/sha512" + "crypto/x509" + "encoding/hex" + "fmt" + "log" + "strings" + + "github.com/miekg/dns" +) + +func dane(addr string, cert *x509.Certificate) (bool, bool) { + if *dnsSrv == "" { + return false, false + } + host := addr + port := "443" + cols := strings.Split(addr, ":") + if len(cols) > 1 { + host = cols[0] + port = cols[1] + } + m := new(dns.Msg) + m.SetQuestion(dns.Fqdn(fmt.Sprintf("_%s._tcp.%s", port, host)), dns.TypeTLSA) + msg, err := dns.Exchange(m, *dnsSrv) + if err != nil { + log.Printf("DNS: %+v\n", err) + return false, false + } + if msg.MsgHdr.Rcode != dns.RcodeSuccess { + return false, false + } + exists := false + for _, answer := range msg.Answer { + tlsa, ok := answer.(*dns.TLSA) + if !ok { + continue + } + if tlsa.Usage != 3 { + // Non EE + continue + } + exists = true + var toMatch []byte + switch tlsa.Selector { + case 0: + toMatch = cert.Raw + case 1: + toMatch = cert.RawSubjectPublicKeyInfo + } + var hsh []byte + switch tlsa.MatchingType { + case 1: + our := sha256.Sum256(toMatch) + hsh = our[:] + case 2: + our := sha512.Sum512(toMatch) + hsh = our[:] + } + if tlsa.Certificate == hex.EncodeToString(hsh) { + return true, true + } + } + return exists, false +} diff --git a/fifo.go b/fifo.go new file mode 100644 index 0000000..948db85 --- /dev/null +++ b/fifo.go @@ -0,0 +1,70 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +package main + +import ( + "log" + "os" + "path/filepath" + "time" + + "go.cypherpunks.ru/tai64n/v2" +) + +var ( + notai *bool + sinkCert = make(chan string) + sinkErr = make(chan string) + sinkOK = make(chan string) + sinkOther = make(chan string) + sinkRedir = make(chan string) + sinkReq = make(chan string) + sinkTLS = make(chan string) + + fifos *string +) + +func sinker(c chan string, p string) { + tai := new(tai64n.TAI64N) + fd, err := os.OpenFile(p, os.O_WRONLY|os.O_APPEND, os.FileMode(0666)) + if err != nil { + log.Fatalln(err) + } + for s := range c { + if *notai { + fd.WriteString(s + "\n") + } else { + tai.FromTime(time.Now()) + fd.WriteString(tai64n.Encode(tai[:]) + " " + s + "\n") + } + fd.Close() + fd, err = os.OpenFile(p, os.O_WRONLY|os.O_APPEND, os.FileMode(0666)) + if err != nil { + log.Printf("Sink error: %+v\n", err) + } + } +} + +func fifoInit() { + go sinker(sinkCert, filepath.Join(*fifos, "cert")) + go sinker(sinkErr, filepath.Join(*fifos, "err")) + go sinker(sinkOK, filepath.Join(*fifos, "ok")) + go sinker(sinkOther, filepath.Join(*fifos, "other")) + go sinker(sinkRedir, filepath.Join(*fifos, "redir")) + go sinker(sinkReq, filepath.Join(*fifos, "req")) + go sinker(sinkTLS, filepath.Join(*fifos, "tls")) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..b836561 --- /dev/null +++ b/go.mod @@ -0,0 +1,16 @@ +module go.stargrave.org/tofuproxy + +go 1.17 + +require ( + github.com/dustin/go-humanize v1.0.0 + github.com/miekg/dns v1.1.29 + go.cypherpunks.ru/tai64n/v2 v2.0.0 + go.cypherpunks.ru/ucspi v0.0.0-20210904200151-57c1e9924fef +) + +require ( + golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect + golang.org/x/net v0.0.0-20190923162816-aa69164e4478 // indirect + golang.org/x/sys v0.0.0-20210423082822-04245dca01da // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..3c12a21 --- /dev/null +++ b/go.sum @@ -0,0 +1,26 @@ +github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo= +github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= +github.com/miekg/dns v1.1.29 h1:xHBEhR+t5RzcFJjBLJlax2daXOrTYtr9z4WdKEfWFzg= +github.com/miekg/dns v1.1.29/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM= +go.cypherpunks.ru/tai64n/v2 v2.0.0 h1:AlohA1/zRqInhIGK7CVnn7tC5/vt1TaOAEyBgeu5Ruo= +go.cypherpunks.ru/tai64n/v2 v2.0.0/go.mod h1:9eeXyzoNO/8grf+bw+T1HXRCRjHVXjUsvnIyaUkjS5I= +go.cypherpunks.ru/ucspi v0.0.0-20210904200151-57c1e9924fef h1:tGNNuzuVYOYkvWQuu4bYMapbFfCVPv0kPeBHrDxtQ2I= +go.cypherpunks.ru/ucspi v0.0.0-20210904200151-57c1e9924fef/go.mod h1:x/y6IZN50ZDjQHhsF10B9p3s+YdJi9/kUUGmuuDAXYw= +golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= +golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq69pTHfNouLtWZG7j9rPN8= +golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= +golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg= +golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= +golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= +golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g= +golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= +golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU= +golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= +golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= +golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c= +golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= +golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28= +golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= diff --git a/main.go b/main.go new file mode 100644 index 0000000..6521cb6 --- /dev/null +++ b/main.go @@ -0,0 +1,332 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +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( + ` +%d %s: %s redirection +Redirection to %s +`, + 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) + } +} diff --git a/multitail.sh b/multitail.sh new file mode 100755 index 0000000..f52773c --- /dev/null +++ b/multitail.sh @@ -0,0 +1,11 @@ +#!/bin/sh + +multitail \ + -wh 10 \ + -t "Certificates" -ci magenta -l "while :; do tai64nlocal < fifos/cert ; done" \ + -t "Errors" -ci red -L "while :; do tai64nlocal < fifos/err ; done" \ + -t "Responses" -ci green --label "< " -l "while :; do tai64nlocal < fifos/ok ; done" \ + -t "Others" -ci white -L "while :; do tai64nlocal < fifos/other ; done" \ + -t "Redirections" -ci cyan --label "R " -L "while :; do tai64nlocal < fifos/redir ; done" \ + -t "Requests" -ci blue --label "> " -L "while :; do tai64nlocal < fifos/req ; done" \ + -t "TLS connections" -ci yellow --label "S " -L "while :; do tai64nlocal < fifos/tls ; done" diff --git a/prv.pem.do b/prv.pem.do new file mode 100644 index 0000000..c2ee376 --- /dev/null +++ b/prv.pem.do @@ -0,0 +1 @@ +certtool --generate-privkey --bits 256 --ecc diff --git a/spy.go b/spy.go new file mode 100644 index 0000000..b4e1349 --- /dev/null +++ b/spy.go @@ -0,0 +1,23 @@ +package main + +var SpyDomains = []string{ + "google-analytics.com", + "goo.gl", + "ads.google.com", + "facebook.com", + "facebook.net", + "fbcdn.com", + "fbcdn.net", + "advertising.yandex.ru", + "an.yandex.ru", + "awaps.yandex.ru", + "bs.yandex.ru", + "informer.yandex.ru", + "mc.yandex.ru", + "metrika.yandex.ru", + "reklama-direct-yandex.ru", + "yandexadexchange.net", + "yandexreklama.com", + "doubleclick.net", + "tns-counter.ru", +} diff --git a/verify.go b/verify.go new file mode 100644 index 0000000..922fc63 --- /dev/null +++ b/verify.go @@ -0,0 +1,147 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +package main + +import ( + "bytes" + "crypto/x509" + "encoding/pem" + "fmt" + "log" + "os" + "os/exec" + "path/filepath" + "strings" + + "go.cypherpunks.ru/ucspi" +) + +func verifyCert( + host string, + dialErr error, + rawCerts [][]byte, + verifiedChains [][]*x509.Certificate, +) error { + var certTheir *x509.Certificate + var err error + if len(verifiedChains) > 0 { + certTheir = verifiedChains[0][0] + } else { + certTheir, err = x509.ParseCertificate(rawCerts[0]) + if err != nil { + return err + } + } + certTheirHash := spkiHash(certTheir) + acceptedM.RLock() + certOurHash := accepted[host] + acceptedM.RUnlock() + if certTheirHash == certOurHash { + return nil + } + rejectedM.RLock() + certOurHash = rejected[host] + rejectedM.RUnlock() + if certTheirHash == certOurHash { + return ErrRejected{host} + } + daneExists, daneMatched := dane(host, certTheir) + if daneExists { + if daneMatched { + sinkCert <- fmt.Sprintf("DANE\t%s\tmatched", host) + } else { + sinkErr <- fmt.Sprintf("DANE\t%s\tnot matched", host) + } + } + fn := filepath.Join(*certs, host) + certsOur, _, err := ucspi.CertPoolFromFile(fn) + if err == nil || dialErr != nil || (daneExists && !daneMatched) { + if certsOur != nil && certTheirHash == spkiHash(certsOur[0]) { + acceptedAdd(host, certTheirHash) + if bytes.Compare(certsOur[0].Raw, rawCerts[0]) != 0 { + sinkCert <- fmt.Sprintf("Refresh\t%s\t%s", host, certTheirHash) + goto CertUpdate + } + return nil + } + cmd := exec.Command( + "xmessage", + "-buttons", + "Accept:10,Once:11,Reject:12", + "-file", "-", + ) + var b bytes.Buffer + b.WriteString("Host: " + host) + if dialErr != nil { + b.WriteString("\nError: " + dialErr.Error()) + } + if daneExists { + if daneMatched { + b.WriteString("\nDANE matched") + } else { + b.WriteString("\nDANE no match!") + } + } + for i, rawCert := range rawCerts { + b.WriteString(fmt.Sprintf("\nTheir %d:\n", i)) + b.WriteString(certInfo(rawCert)) + } + if certsOur != nil { + b.WriteString(strings.Repeat("-", 80)) + for i, cert := range certsOur { + b.WriteString(fmt.Sprintf("\nOur %d:\n", i)) + b.WriteString(certInfo(cert.Raw)) + } + } + cmd.Stdin = &b + switch cmd.Run().(*exec.ExitError).ExitCode() { + case 10: + sinkCert <- fmt.Sprintf("ADD\t%s\t%s", host, certTheirHash) + goto CertUpdate + case 11: + sinkCert <- fmt.Sprintf("ONCE\t%s\t%s", host, certTheirHash) + acceptedAdd(host, certTheirHash) + return nil + case 12: + rejectedAdd(host, certTheirHash) + fallthrough + default: + sinkCert <- fmt.Sprintf("DENY\t%s\t%s", host, certTheirHash) + return ErrRejected{host} + } + } else { + if !os.IsNotExist(err) { + return err + } + sinkCert <- fmt.Sprintf("TOFU\t%s\t%s", host, certTheirHash) + } +CertUpdate: + tmp, err := os.CreateTemp(*certs, "") + if err != nil { + log.Fatalln(err) + } + for _, rawCert := range rawCerts { + err = pem.Encode(tmp, &pem.Block{Type: "CERTIFICATE", Bytes: rawCert}) + if err != nil { + log.Fatalln(err) + } + } + tmp.Close() + os.Rename(tmp.Name(), fn) + acceptedAdd(host, certTheirHash) + return nil +} diff --git a/x509.go b/x509.go new file mode 100644 index 0000000..d0e54a1 --- /dev/null +++ b/x509.go @@ -0,0 +1,84 @@ +/* +Copyright (C) 2021 Sergey Matveev + +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 . +*/ + +package main + +import ( + "crypto" + "crypto/ecdsa" + "crypto/elliptic" + "crypto/rand" + "crypto/x509" + "crypto/x509/pkix" + "log" + "math/big" + "sync" + "time" +) + +type Keypair struct { + cert *x509.Certificate + prv crypto.PrivateKey +} + +var ( + hostCerts = make(map[string]*Keypair) + hostCertsM sync.Mutex + Serial *big.Int +) + +func init() { + max := big.NewInt(0) + max = max.SetBit(max, 128, 1) + var err error + Serial, err = rand.Int(rand.Reader, max) + if err != nil { + panic(err) + } +} + +func newKeypair( + host string, + caCert *x509.Certificate, + caPrv crypto.PrivateKey, +) *Keypair { + prv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader) + if err != nil { + log.Fatalln(err) + } + pub := prv.Public() + notBefore := time.Now() + notAfter := notBefore.Add(24 * time.Hour) + Serial = Serial.Add(Serial, big.NewInt(1)) + template := x509.Certificate{ + SerialNumber: Serial, + Subject: pkix.Name{CommonName: host}, + DNSNames: []string{host}, + NotBefore: notBefore, + NotAfter: notAfter, + } + certRaw, err := x509.CreateCertificate( + rand.Reader, &template, caCert, pub, caPrv, + ) + if err != nil { + log.Fatalln(err) + } + cert, err := x509.ParseCertificate(certRaw) + if err != nil { + log.Fatalln(err) + } + return &Keypair{cert, prv} +}