diff --git a/README.md b/README.md index 4f502a6..72ba15e 100644 --- a/README.md +++ b/README.md @@ -37,6 +37,7 @@ Current matchers: - **layer4.matchers.openvpn** - matches connections that look like [OpenVPN](https://openvpn.net/community-resources/openvpn-protocol/) connections. - **layer4.matchers.postgres** - matches connections that look like Postgres connections. - **layer4.matchers.proxy_protocol** - matches connections that start with [HAPROXY proxy protocol](https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt). +- **layer4.matchers.quic** - matches connections that look like [QUIC](https://quic.xargs.org/). - **layer4.matchers.rdp** - matches connections that look like [RDP](https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-RDPBCGR/%5BMS-RDPBCGR%5D.pdf). - **layer4.matchers.regexp** - matches connections that have the first packet bytes matching a regular expression. - **layer4.matchers.remote_ip** - matches connections based on remote IP (or CIDR range). diff --git a/imports.go b/imports.go index b252764..2c38c1f 100644 --- a/imports.go +++ b/imports.go @@ -25,6 +25,7 @@ import ( _ "github.com/mholt/caddy-l4/modules/l4postgres" _ "github.com/mholt/caddy-l4/modules/l4proxy" _ "github.com/mholt/caddy-l4/modules/l4proxyprotocol" + _ "github.com/mholt/caddy-l4/modules/l4quic" _ "github.com/mholt/caddy-l4/modules/l4rdp" _ "github.com/mholt/caddy-l4/modules/l4regexp" _ "github.com/mholt/caddy-l4/modules/l4socks" diff --git a/integration/caddyfile_adapt/gd_matcher_quic.caddytest b/integration/caddyfile_adapt/gd_matcher_quic.caddytest new file mode 100644 index 0000000..2a1490e --- /dev/null +++ b/integration/caddyfile_adapt/gd_matcher_quic.caddytest @@ -0,0 +1,83 @@ +{ + layer4 { + udp/:8843 { + @q1 quic sni one.com two.com + route @q1 { + proxy udp/{l4.quic.tls.server_name}:443 + } + @q2 quic { + alpn custom + sni example.com + } + route @q2 { + proxy udp/localhost:6543 + } + } + } +} +---------- +{ + "apps": { + "layer4": { + "servers": { + "srv0": { + "listen": [ + "udp/:8843" + ], + "routes": [ + { + "match": [ + { + "quic": { + "sni": [ + "one.com", + "two.com" + ] + } + } + ], + "handle": [ + { + "handler": "proxy", + "upstreams": [ + { + "dial": [ + "udp/{l4.quic.tls.server_name}:443" + ] + } + ] + } + ] + }, + { + "match": [ + { + "quic": { + "alpn": [ + "custom" + ], + "sni": [ + "example.com" + ] + } + } + ], + "handle": [ + { + "handler": "proxy", + "upstreams": [ + { + "dial": [ + "udp/localhost:6543" + ] + } + ] + } + ] + } + ] + } + } + } + } +} \ No newline at end of file diff --git a/modules/l4quic/matcher.go b/modules/l4quic/matcher.go new file mode 100644 index 0000000..66076a5 --- /dev/null +++ b/modules/l4quic/matcher.go @@ -0,0 +1,346 @@ +// Copyright 2024 VNXME +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package l4quic + +import ( + "context" + "crypto" + "crypto/ed25519" + "crypto/rand" + "crypto/tls" + "crypto/x509" + "encoding/json" + "fmt" + "io" + "math/big" + "net" + "time" + + "github.com/caddyserver/caddy/v2" + "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" + "github.com/caddyserver/caddy/v2/modules/caddytls" + "github.com/quic-go/quic-go" + + "github.com/mholt/caddy-l4/layer4" + "github.com/mholt/caddy-l4/modules/l4tls" +) + +func init() { + caddy.RegisterModule(&MatchQUIC{}) +} + +// MatchQUIC is able to match QUIC connections. Its structure +// is different from the auto-generated documentation. This +// value should be a map of matcher names to their values. +type MatchQUIC struct { + MatchersRaw caddy.ModuleMap `json:"-" caddy:"namespace=tls.handshake_match"` + + matchers []caddytls.ConnectionMatcher + quicConf *quic.Config + tlsConf *tls.Config +} + +// CaddyModule returns the Caddy module information. +func (m *MatchQUIC) CaddyModule() caddy.ModuleInfo { + return caddy.ModuleInfo{ + ID: "layer4.matchers.quic", + New: func() caddy.Module { return new(MatchQUIC) }, + } +} + +// Match returns true if the connection looks like QUIC. +func (m *MatchQUIC) Match(cx *layer4.Connection) (bool, error) { + // Check if the protocol is UDP + if _, isUDP := cx.LocalAddr().(*net.UDPAddr); !isUDP { + return false, nil + } + + // Read one byte + buf := make([]byte, 1) + n, err := io.ReadAtLeast(cx, buf, 1) + if err != nil { + return false, err + } + + // Ensure the second bit of the first byte is set, i.e. continue if + // github.com/quic-go/quic-go/internal/wire.IsPotentialQUICPacket(buf[0]). + qFirstByte := buf[0] + if qFirstByte&QUICMagicBitValue == 0 { + return false, nil + } + + // Ensure the first bit of the first byte is set, i.e. continue if + // github.com/quic-go/quic-go/internal/wire.IsLongHeaderPacket(buf[0]). + // Note: this behaviour may be changed in the future if there are packets + // that should be considered valid despite having the first bit unset. + if qFirstByte&QUICLongHeaderBitValue == 0 { + return false, nil + } + + // Read the remaining bytes + buf = make([]byte, QUICPacketBytesMax+1) + buf[0] = qFirstByte + n, err = io.ReadAtLeast(cx, buf[1:], 1) + if err != nil || n < QUICPacketBytesMin-1 || n == QUICPacketBytesMax { + return false, err + } + + // Use a workaround to match ALPNs. This way quic.EarlyListener.Accept() exits on deadline + // if it receives a packet having an ALPN other than those present in tls.Config.NextProtos. + repl := cx.Context.Value(layer4.ReplacerCtxKey).(*caddy.Replacer) + tlsConf := &tls.Config{Certificates: m.tlsConf.Certificates} + for _, matcher := range m.matchers { + if alpnMatcher, ok := matcher.(*l4tls.MatchALPN); ok { + for _, alpnValue := range *alpnMatcher { + alpnValue = repl.ReplaceAll(alpnValue, "") + if len(alpnValue) > 0 { + tlsConf.NextProtos = append(tlsConf.NextProtos, alpnValue) + } + } + } + } + + // Create a new fakePacketConn pipe + serverFPC, clientFPC := newFakePacketConnPipe(&fakePipeAddr{ID: newRandQuintillion(), TS: time.Now()}, nil) + defer func() { _ = serverFPC.Close() }() + defer func() { _ = clientFPC.Close() }() + + // Launch a new quic.EarlyListener + var qListener *quic.EarlyListener + qListener, err = quic.ListenEarly(serverFPC, tlsConf, m.quicConf) + if err != nil { + return false, err + } + defer func() { _ = qListener.Close() }() + + // Write the buffered bytes into the pipe + n, err = clientFPC.WriteTo(buf[:n+1], nil) + if err != nil { + return false, nil + } + + // Prepare a context with a deadline + qContext, qCancel := context.WithDeadline(context.Background(), time.Now().Add(QUICAcceptTimeout)) + defer qCancel() + + // Accept a new quic.EarlyConnection + var qConn quic.EarlyConnection + qConn, err = qListener.Accept(qContext) + if err != nil { + return false, nil + } + + // Obtain a quic.ConnectionState + qState := qConn.ConnectionState() + + // Add values to the replacer + repl.Set("l4.quic.tls.server_name", qState.TLS.ServerName) + repl.Set("l4.quic.tls.version", qState.TLS.Version) + repl.Set("l4.quic.version", qState.Version.String()) + + // Fill a tls.ClientHelloInfo structure + chi := &tls.ClientHelloInfo{ + CipherSuites: []uint16{qState.TLS.CipherSuite}, + ServerName: qState.TLS.ServerName, + SupportedCurves: nil, + SupportedPoints: nil, + SignatureSchemes: nil, + SupportedProtos: []string{qState.TLS.NegotiatedProtocol}, // Empty if no ALPNs are provided + SupportedVersions: []uint16{tls.VersionTLS13}, // Presumed to always be TLS 1.3 + Conn: cx, + } + + // Check TLS matchers if any + for _, matcher := range m.matchers { + // ALPN matching is implicitly done above when the QUIC listener is initialised, + // as quic.EarlyConnection.ConnectionState().TLS.NegotiatedProtocol is only filled + // when the client's ALPN matches one of the values set in tls.Config.NextProtos. + if _, isMatchALPN := matcher.(*l4tls.MatchALPN); isMatchALPN { + continue + } + + // TODO: even though we have more data than the standard lib's + // ClientHelloInfo lets us fill, the matcher modules we use do + // not accept our own type; but the advantage of this is that + // we can reuse TLS connection matchers from the tls app - but + // it would be nice if we found a way to give matchers all + // the information + if !matcher.Match(chi) { + return false, nil + } + } + + return true, nil +} + +// Provision prepares m's internal structures. +func (m *MatchQUIC) Provision(ctx caddy.Context) error { + // Load TLS matchers + mods, err := ctx.LoadModule(m, "MatchersRaw") + if err != nil { + return fmt.Errorf("loading TLS matchers: %v", err) + } + for _, modAny := range mods.(map[string]any) { + m.matchers = append(m.matchers, modAny.(caddytls.ConnectionMatcher)) + } + + // Generate a new private key + var key crypto.PrivateKey + _, key, err = ed25519.GenerateKey(rand.Reader) + if err != nil { + return fmt.Errorf("generating a private key: %v", err) + } + + // Compose a new x509 certificate + leaf := &x509.Certificate{} + + // Initialize a new TLS config + m.tlsConf = &tls.Config{ + Certificates: []tls.Certificate{{Leaf: leaf, PrivateKey: key}}, + } + + // Initialize a new QUIC config + m.quicConf = &quic.Config{} + + return nil +} + +// UnmarshalCaddyfile sets up the MatchQUIC from Caddyfile tokens. Syntax: +// +// quic { +// [] +// [] +// } +// quic [] +// quic +func (m *MatchQUIC) UnmarshalCaddyfile(d *caddyfile.Dispenser) error { + d.Next() // consume wrapper name + + matcherSet, err := l4tls.ParseCaddyfileNestedMatcherSet(d) + if err != nil { + return err + } + m.MatchersRaw = matcherSet + + return nil +} + +// UnmarshalJSON satisfies the json.Unmarshaler interface. +func (m *MatchQUIC) UnmarshalJSON(b []byte) error { + return json.Unmarshal(b, &m.MatchersRaw) +} + +// MarshalJSON satisfies the json.Marshaler interface. +func (m *MatchQUIC) MarshalJSON() ([]byte, error) { + return json.Marshal(m.MatchersRaw) +} + +// fakePipeAddr satisfies net.Addr and uses a random number and a timestamp +// to avoid panic in quic.connMultiplexer.AddConn() due to the same local address. +type fakePipeAddr struct { + ID *big.Int + TS time.Time +} + +func (fpa fakePipeAddr) Network() string { + return "pipe" +} + +func (fpa fakePipeAddr) String() string { + return fmt.Sprintf("fake_%v_%v", fpa.ID.String(), fpa.TS.UnixNano()) +} + +// fakePacketConn wraps around net.Conn and satisfies net.PacketConn. +type fakePacketConn struct { + net.Conn + + Local net.Addr + Remote net.Addr +} + +func (fpc *fakePacketConn) LocalAddr() net.Addr { + if fpc.Local != nil { + return fpc.Local + } + return fpc.Conn.LocalAddr() +} + +func (fpc *fakePacketConn) ReadFrom(p []byte) (int, net.Addr, error) { + n, err := fpc.Conn.Read(p) + return n, fpc.RemoteAddr(), err +} + +func (fpc *fakePacketConn) RemoteAddr() net.Addr { + if fpc.Remote != nil { + return fpc.Remote + } + return fpc.Conn.RemoteAddr() +} + +func (fpc *fakePacketConn) SetReadBuffer(_ int) error { + return nil +} + +func (fpc *fakePacketConn) SetWriteBuffer(_ int) error { + return nil +} + +func (fpc *fakePacketConn) WriteTo(p []byte, _ net.Addr) (int, error) { + return fpc.Conn.Write(p) +} + +// Interface guards +var ( + _ caddy.Provisioner = (*MatchQUIC)(nil) + _ caddyfile.Unmarshaler = (*MatchQUIC)(nil) + _ layer4.ConnMatcher = (*MatchQUIC)(nil) + + _ net.Addr = (*fakePipeAddr)(nil) + + _ net.PacketConn = (*fakePacketConn)(nil) + _ interface{ SetReadBuffer(int) error } = (*fakePacketConn)(nil) + _ interface{ SetWriteBuffer(int) error } = (*fakePacketConn)(nil) +) + +const ( + QUICAcceptTimeout = 100 * time.Millisecond + + QUICLongHeaderBitValue uint8 = 0x80 // github.com/quic-go/quic-go/internal/wire.IsLongHeaderPacket() + QUICMagicBitValue uint8 = 0x40 // github.com/quic-go/quic-go/internal/wire.IsPotentialQUICPacket() + + QUICPacketBytesMax = 1452 // github.com/quic-go/quic-go/internal/protocol.MaxPacketBufferSize + QUICPacketBytesMin = 1200 // github.com/quic-go/quic-go/internal/protocol.MinInitialPacketSize +) + +func newFakePacketConnPipe(local, remote net.Addr) (*fakePacketConn, *fakePacketConn) { + server, client := net.Pipe() + serverFPC, clientFPC := &fakePacketConn{Conn: server}, &fakePacketConn{Conn: client} + if local != nil || remote != nil { + if local == nil { + local = remote + } + if remote == nil { + remote = local + } + serverFPC.Local, clientFPC.Remote = local, local + serverFPC.Remote, clientFPC.Local = remote, remote + } + return serverFPC, clientFPC +} + +func newRandQuintillion() *big.Int { + rnd, _ := rand.Int(rand.Reader, big.NewInt(1000000000000000000)) + return rnd +} diff --git a/modules/l4quic/matcher_test.go b/modules/l4quic/matcher_test.go new file mode 100644 index 0000000..6cf371d --- /dev/null +++ b/modules/l4quic/matcher_test.go @@ -0,0 +1,113 @@ +// Copyright 2024 VNXME +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package l4quic + +import ( + "context" + "encoding/json" + "errors" + "io" + "net" + "testing" + + "github.com/caddyserver/caddy/v2" + "go.uber.org/zap" + + "github.com/mholt/caddy-l4/layer4" +) + +func assertNoError(t *testing.T, err error) { + t.Helper() + if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrUnexpectedEOF) { + t.Fatalf("Unexpected error: %s\n", err) + } +} + +func Test_MatchQUIC_Match(t *testing.T) { + type test struct { + matcher *MatchQUIC + data []byte + shouldMatch bool + } + + m0 := &MatchQUIC{} + m1 := &MatchQUIC{MatchersRaw: map[string]json.RawMessage{ + "sni": json.RawMessage(`["example.com"]`), + }} + m2 := &MatchQUIC{MatchersRaw: map[string]json.RawMessage{ + "alpn": json.RawMessage(`["custom"]`), + "sni": json.RawMessage(`["example.com"]`), + }} + m3 := &MatchQUIC{MatchersRaw: map[string]json.RawMessage{ + "alpn": json.RawMessage(`["h3"]`), + "sni": json.RawMessage(`["example.com"]`), + }} + + tests := []test{ + {matcher: m0, data: packet1, shouldMatch: true}, + {matcher: m0, data: packet2, shouldMatch: true}, + + {matcher: m1, data: packet1, shouldMatch: true}, + {matcher: m1, data: packet2, shouldMatch: true}, + + {matcher: m2, data: packet1, shouldMatch: false}, + {matcher: m2, data: packet2, shouldMatch: true}, + + {matcher: m3, data: packet1, shouldMatch: true}, + {matcher: m3, data: packet2, shouldMatch: false}, + + {matcher: m0, data: append(packet1, packet2...), shouldMatch: false}, + {matcher: m0, data: append([]byte{QUICMagicBitValue}, packet1[1:]...), shouldMatch: false}, + {matcher: m0, data: append([]byte{QUICLongHeaderBitValue}, packet1[1:]...), shouldMatch: false}, + {matcher: m0, data: append([]byte{QUICMagicBitValue | QUICLongHeaderBitValue}, packet1[1:]...), shouldMatch: false}, + {matcher: m0, data: packet1[:len(packet1)-1], shouldMatch: false}, + } + ctx, cancel := caddy.NewContext(caddy.Context{Context: context.Background()}) + defer cancel() + + for i, tc := range tests { + func() { + err := tc.matcher.Provision(ctx) + assertNoError(t, err) + + in, out := newFakePacketConnPipe(&net.UDPAddr{}, nil) + defer func() { + _, _ = io.Copy(io.Discard, out) + _ = out.Close() + }() + + cx := layer4.WrapConnection(out, []byte{}, zap.NewNop()) + go func() { + _, err := in.Write(tc.data) + assertNoError(t, err) + _ = in.Close() + }() + + matched, err := tc.matcher.Match(cx) + assertNoError(t, err) + + if matched != tc.shouldMatch { + if tc.shouldMatch { + t.Fatalf("Test %d: matcher did not match | %+v\n", i, tc.matcher) + } else { + t.Fatalf("Test %d: matcher should not match | %+v\n", i, tc.matcher) + } + } + }() + } +} + +var packet1 = []byte{0xc4, 0x00, 0x00, 0x00, 0x01, 0x08, 0x1b, 0xb6, 0x86, 0x97, 0xca, 0xc4, 0xa6, 0xf8, 0x00, 0x00, 0x44, 0xda, 0xf2, 0x95, 0xc1, 0xe3, 0xe5, 0x13, 0x99, 0x6d, 0x06, 0x6b, 0x15, 0x80, 0x78, 0xbc, 0x17, 0x22, 0x5c, 0xad, 0xb3, 0x34, 0xc9, 0x08, 0x2b, 0x76, 0x6f, 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