Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
Mirrored from https://github.com/Slazee/caddy.git
Synced Nov 11, 01:00 UTC
| 1 | // Copyright 2015 Matthew Holt and The Caddy Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package integration |
| 16 | |
| 17 | import ( |
| 18 | "crypto/ecdh" |
| 19 | "crypto/rand" |
| 20 | "crypto/tls" |
| 21 | "encoding/binary" |
| 22 | "errors" |
| 23 | "testing" |
| 24 | "time" |
| 25 | |
| 26 | "github.com/caddyserver/caddy/v2/caddytest" |
| 27 | ) |
| 28 | |
| 29 | // When ECH is rejected, the server must send its current ECH configs back so |
| 30 | // the client can retry with ECH instead of falling back to plaintext SNI. |
| 31 | func TestECHRejectionSendsRetryConfigs(t *testing.T) { |
| 32 | tester := caddytest.NewTester(t) |
| 33 | tester.InitServer(` |
| 34 | { |
| 35 | skip_install_trust |
| 36 | local_certs |
| 37 | admin localhost:2999 |
| 38 | http_port 9080 |
| 39 | https_port 9443 |
| 40 | ech ech.localhost |
| 41 | } |
| 42 | a.localhost { |
| 43 | respond "ok" |
| 44 | } |
| 45 | `, "caddyfile") |
| 46 | |
| 47 | // certificates are obtained in the background; the rejected handshake |
| 48 | // is completed with the public name's certificate |
| 49 | waitForCertificate(t, "a.localhost") |
| 50 | waitForCertificate(t, "ech.localhost") |
| 51 | |
| 52 | // a well-formed ECH config with a key the server doesn't have, like a |
| 53 | // client would hold after the server's keys were rotated |
| 54 | stale := echConfigList(t, "ech.localhost") |
| 55 | |
| 56 | _, err := dialECH(stale) |
| 57 | var rejection *tls.ECHRejectionError |
| 58 | if !errors.As(err, &rejection) { |
| 59 | t.Fatalf("expected ECH to be rejected, got: %v", err) |
| 60 | } |
| 61 | if len(rejection.RetryConfigList) == 0 { |
| 62 | t.Fatal("ECH was rejected without retry configs") |
| 63 | } |
| 64 | |
| 65 | conn, err := dialECH(rejection.RetryConfigList) |
| 66 | if err != nil { |
| 67 | t.Fatalf("retrying with the server's retry configs: %v", err) |
| 68 | } |
| 69 | defer conn.Close() |
| 70 | if !conn.ConnectionState().ECHAccepted { |
| 71 | t.Fatal("ECH was not accepted when retrying with the server's retry configs") |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | func waitForCertificate(t *testing.T, serverName string) { |
| 76 | t.Helper() |
| 77 | var err error |
| 78 | for range 50 { |
| 79 | var conn *tls.Conn |
| 80 | conn, err = tls.Dial("tcp", "127.0.0.1:9443", &tls.Config{ |
| 81 | ServerName: serverName, |
| 82 | InsecureSkipVerify: true, //nolint:gosec |
| 83 | }) |
| 84 | if err == nil { |
| 85 | conn.Close() |
| 86 | return |
| 87 | } |
| 88 | time.Sleep(100 * time.Millisecond) |
| 89 | } |
| 90 | t.Fatalf("no certificate for %s: %v", serverName, err) |
| 91 | } |
| 92 | |
| 93 | func dialECH(configList []byte) (*tls.Conn, error) { |
| 94 | return tls.Dial("tcp", "127.0.0.1:9443", &tls.Config{ |
| 95 | ServerName: "a.localhost", |
| 96 | InsecureSkipVerify: true, //nolint:gosec |
| 97 | EncryptedClientHelloConfigList: configList, |
| 98 | // the outer handshake uses the public name's certificate from the |
| 99 | // test's internal CA, which this client doesn't trust |
| 100 | EncryptedClientHelloRejectionVerify: func(tls.ConnectionState) error { return nil }, |
| 101 | }) |
| 102 | } |
| 103 | |
| 104 | // echConfigList returns an ECHConfigList holding one version 0xfe0d config |
| 105 | // with a fresh X25519 key, HKDF-SHA256 and AES-128-GCM. |
| 106 | func echConfigList(t *testing.T, publicName string) []byte { |
| 107 | key, err := ecdh.X25519().GenerateKey(rand.Reader) |
| 108 | if err != nil { |
| 109 | t.Fatal(err) |
| 110 | } |
| 111 | pub := key.PublicKey().Bytes() |
| 112 | |
| 113 | var contents []byte |
| 114 | contents = append(contents, 1) // config_id |
| 115 | contents = binary.BigEndian.AppendUint16(contents, 0x0020) // KEM: DHKEM(X25519, HKDF-SHA256) |
| 116 | contents = binary.BigEndian.AppendUint16(contents, uint16(len(pub))) |
| 117 | contents = append(contents, pub...) |
| 118 | contents = binary.BigEndian.AppendUint16(contents, 4) // cipher suites length |
| 119 | contents = binary.BigEndian.AppendUint16(contents, 0x0001) // KDF: HKDF-SHA256 |
| 120 | contents = binary.BigEndian.AppendUint16(contents, 0x0001) // AEAD: AES-128-GCM |
| 121 | contents = append(contents, 0) // maximum_name_length |
| 122 | contents = append(contents, byte(len(publicName))) |
| 123 | contents = append(contents, publicName...) |
| 124 | contents = binary.BigEndian.AppendUint16(contents, 0) // extensions |
| 125 | |
| 126 | config := binary.BigEndian.AppendUint16(nil, 0xfe0d) // version |
| 127 | config = binary.BigEndian.AppendUint16(config, uint16(len(contents))) |
| 128 | config = append(config, contents...) |
| 129 | |
| 130 | return append(binary.BigEndian.AppendUint16(nil, uint16(len(config))), config...) |
| 131 | } |