| 1 | package utils |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto" |
| 6 | "crypto/ecdsa" |
| 7 | "crypto/rsa" |
| 8 | "crypto/tls" |
| 9 | "crypto/x509" |
| 10 | "encoding/pem" |
| 11 | "errors" |
| 12 | "fmt" |
| 13 | "net" |
| 14 | "net/http" |
| 15 | "net/url" |
| 16 | "strings" |
| 17 | "time" |
| 18 | ) |
| 19 | |
| 20 | func NewHTTPTLSClient(ctx context.Context, relayURL *url.URL, timeout time.Duration) (*tls.Config, *http.Client, *http.Transport, error) { |
| 21 | if relayURL == nil { |
| 22 | return nil, nil, nil, errors.New("relay url is required") |
| 23 | } |
| 24 | |
| 25 | serverName := relayURL.Hostname() |
| 26 | if serverName == "" { |
| 27 | return nil, nil, nil, errors.New("relay hostname is required") |
| 28 | } |
| 29 | |
| 30 | var rootCAs *x509.CertPool |
| 31 | if IsLocalRelayHost(serverName) { |
| 32 | rootCAPEM, err := FetchEndpointCertificateChain(ctx, relayURL.String(), serverName) |
| 33 | if err != nil { |
| 34 | return nil, nil, nil, fmt.Errorf("bootstrap localhost relay trust: %w", err) |
| 35 | } |
| 36 | rootCAs = x509.NewCertPool() |
| 37 | if !rootCAs.AppendCertsFromPEM(rootCAPEM) { |
| 38 | return nil, nil, nil, errors.New("failed to parse relay root ca") |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | rawTLSConfig := &tls.Config{ |
| 43 | MinVersion: tls.VersionTLS12, |
| 44 | ServerName: serverName, |
| 45 | RootCAs: rootCAs, |
| 46 | NextProtos: []string{"http/1.1"}, |
| 47 | } |
| 48 | httpClient := NewHTTPClient( |
| 49 | WithHTTPTLSConfig(rawTLSConfig), // will be cloned internally |
| 50 | WithoutHTTP2(), |
| 51 | WithHTTPTimeout(timeout), |
| 52 | ) |
| 53 | return rawTLSConfig, httpClient, mustTransportOf(httpClient), nil |
| 54 | } |
| 55 | |
| 56 | func FetchEndpointCertificateChain(ctx context.Context, endpoint, serverName string) ([]byte, error) { |
| 57 | raw := strings.TrimSpace(endpoint) |
| 58 | if raw == "" { |
| 59 | return nil, errors.New("endpoint is required") |
| 60 | } |
| 61 | if !strings.Contains(raw, "://") { |
| 62 | raw = "https://" + raw |
| 63 | } |
| 64 | |
| 65 | u, err := url.Parse(raw) |
| 66 | if err != nil { |
| 67 | return nil, fmt.Errorf("parse endpoint url: %w", err) |
| 68 | } |
| 69 | if !strings.EqualFold(u.Scheme, "https") { |
| 70 | return nil, errors.New("relay endpoint must use https") |
| 71 | } |
| 72 | |
| 73 | host := u.Hostname() |
| 74 | if host == "" { |
| 75 | return nil, errors.New("endpoint hostname is empty") |
| 76 | } |
| 77 | port := u.Port() |
| 78 | if port == "" { |
| 79 | port = "443" |
| 80 | } |
| 81 | if serverName == "" { |
| 82 | serverName = host |
| 83 | } |
| 84 | |
| 85 | dialer := &net.Dialer{Timeout: 5 * time.Second} |
| 86 | rawConn, err := dialer.DialContext(ctx, "tcp", net.JoinHostPort(host, port)) |
| 87 | if err != nil { |
| 88 | return nil, fmt.Errorf("dial relay endpoint: %w", err) |
| 89 | } |
| 90 | |
| 91 | tlsConn := tls.Client(rawConn, &tls.Config{ |
| 92 | MinVersion: tls.VersionTLS12, |
| 93 | ServerName: serverName, |
| 94 | InsecureSkipVerify: IsLocalRelayHost(host), |
| 95 | NextProtos: []string{"http/1.1"}, |
| 96 | }) |
| 97 | defer tlsConn.Close() |
| 98 | if err := tlsConn.HandshakeContext(ctx); err != nil { |
| 99 | return nil, fmt.Errorf("tls handshake with relay endpoint: %w", err) |
| 100 | } |
| 101 | |
| 102 | peerCerts := tlsConn.ConnectionState().PeerCertificates |
| 103 | if len(peerCerts) == 0 { |
| 104 | return nil, errors.New("no peer certificates from relay endpoint") |
| 105 | } |
| 106 | |
| 107 | var chainPEM []byte |
| 108 | for _, cert := range peerCerts { |
| 109 | chainPEM = append(chainPEM, pem.EncodeToMemory(&pem.Block{ |
| 110 | Type: "CERTIFICATE", |
| 111 | Bytes: cert.Raw, |
| 112 | })...) |
| 113 | } |
| 114 | return chainPEM, nil |
| 115 | } |
| 116 | |
| 117 | func ParseCertificatePEM(pemData []byte) (*x509.Certificate, error) { |
| 118 | block, _ := pem.Decode(pemData) |
| 119 | if block == nil { |
| 120 | return nil, errors.New("no pem block found") |
| 121 | } |
| 122 | return x509.ParseCertificate(block.Bytes) |
| 123 | } |
| 124 | |
| 125 | func ParsePrivateKeyPEM(keyPEM []byte) (crypto.PrivateKey, error) { |
| 126 | block, _ := pem.Decode(keyPEM) |
| 127 | if block == nil { |
| 128 | return nil, errors.New("invalid private key pem") |
| 129 | } |
| 130 | if key, err := x509.ParsePKCS8PrivateKey(block.Bytes); err == nil { |
| 131 | switch typed := key.(type) { |
| 132 | case *ecdsa.PrivateKey: |
| 133 | return typed, nil |
| 134 | case *rsa.PrivateKey: |
| 135 | return typed, nil |
| 136 | } |
| 137 | } |
| 138 | if key, err := x509.ParseECPrivateKey(block.Bytes); err == nil { |
| 139 | return key, nil |
| 140 | } |
| 141 | if key, err := x509.ParsePKCS1PrivateKey(block.Bytes); err == nil { |
| 142 | return key, nil |
| 143 | } |
| 144 | return nil, errors.New("unsupported private key type") |
| 145 | } |