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| 1 | +/* |
| 2 | +Copyright 2025 The llm-d-inference-sim Authors. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package llmdinferencesim |
| 18 | + |
| 19 | +import ( |
| 20 | + "crypto/rand" |
| 21 | + "crypto/rsa" |
| 22 | + "crypto/tls" |
| 23 | + "crypto/x509" |
| 24 | + "crypto/x509/pkix" |
| 25 | + "encoding/pem" |
| 26 | + "fmt" |
| 27 | + "math/big" |
| 28 | + "net" |
| 29 | + "time" |
| 30 | + |
| 31 | + "github.com/valyala/fasthttp" |
| 32 | +) |
| 33 | + |
| 34 | +// Based on: https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/8d01161ec48d6b49cd371f179551b35da46e6fd6/internal/tls/tls.go |
| 35 | +func (s *VllmSimulator) configureSSL(server *fasthttp.Server) error { |
| 36 | + if !s.config.SSLEnabled() { |
| 37 | + return nil |
| 38 | + } |
| 39 | + |
| 40 | + var cert tls.Certificate |
| 41 | + var err error |
| 42 | + |
| 43 | + if s.config.SSLCertFile != "" && s.config.SSLKeyFile != "" { |
| 44 | + s.logger.Info("HTTPS server starting with certificate files", "cert", s.config.SSLCertFile, "key", s.config.SSLKeyFile) |
| 45 | + cert, err = tls.LoadX509KeyPair(s.config.SSLCertFile, s.config.SSLKeyFile) |
| 46 | + if err == nil { |
| 47 | + s.logger.Info("Certificate loaded successfully from files") |
| 48 | + } |
| 49 | + } else if s.config.SelfSignedCerts { |
| 50 | + s.logger.Info("HTTPS server starting with self-signed certificate") |
| 51 | + cert, err = CreateSelfSignedTLSCertificate() |
| 52 | + if err == nil { |
| 53 | + s.logger.Info("Self-signed certificate generated successfully") |
| 54 | + } |
| 55 | + } |
| 56 | + |
| 57 | + if err != nil { |
| 58 | + s.logger.Error(err, "failed to create TLS certificate") |
| 59 | + return err |
| 60 | + } |
| 61 | + |
| 62 | + server.TLSConfig = &tls.Config{ |
| 63 | + Certificates: []tls.Certificate{cert}, |
| 64 | + MinVersion: tls.VersionTLS12, |
| 65 | + CipherSuites: []uint16{ |
| 66 | + tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, |
| 67 | + tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, |
| 68 | + tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, |
| 69 | + tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, |
| 70 | + tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, |
| 71 | + tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, |
| 72 | + }, |
| 73 | + } |
| 74 | + |
| 75 | + return nil |
| 76 | +} |
| 77 | + |
| 78 | +// CreateSelfSignedTLSCertificatePEM creates a self-signed cert and returns the PEM-encoded certificate and key bytes |
| 79 | +func CreateSelfSignedTLSCertificatePEM() (certPEM, keyPEM []byte, err error) { |
| 80 | + serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128) |
| 81 | + serialNumber, err := rand.Int(rand.Reader, serialNumberLimit) |
| 82 | + if err != nil { |
| 83 | + return nil, nil, fmt.Errorf("error creating serial number: %v", err) |
| 84 | + } |
| 85 | + now := time.Now() |
| 86 | + notBefore := now.UTC() |
| 87 | + template := x509.Certificate{ |
| 88 | + SerialNumber: serialNumber, |
| 89 | + Subject: pkix.Name{ |
| 90 | + Organization: []string{"llm-d Inference Simulator"}, |
| 91 | + }, |
| 92 | + NotBefore: notBefore, |
| 93 | + NotAfter: now.Add(time.Hour * 24 * 365 * 10).UTC(), // 10 years |
| 94 | + KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, |
| 95 | + ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, |
| 96 | + BasicConstraintsValid: true, |
| 97 | + IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback}, |
| 98 | + DNSNames: []string{"localhost"}, |
| 99 | + } |
| 100 | + |
| 101 | + priv, err := rsa.GenerateKey(rand.Reader, 4096) |
| 102 | + if err != nil { |
| 103 | + return nil, nil, fmt.Errorf("error generating key: %v", err) |
| 104 | + } |
| 105 | + |
| 106 | + derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv) |
| 107 | + if err != nil { |
| 108 | + return nil, nil, fmt.Errorf("error creating certificate: %v", err) |
| 109 | + } |
| 110 | + |
| 111 | + certBytes := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}) |
| 112 | + |
| 113 | + privBytes, err := x509.MarshalPKCS8PrivateKey(priv) |
| 114 | + if err != nil { |
| 115 | + return nil, nil, fmt.Errorf("error marshalling private key: %v", err) |
| 116 | + } |
| 117 | + keyBytes := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}) |
| 118 | + |
| 119 | + return certBytes, keyBytes, nil |
| 120 | +} |
| 121 | + |
| 122 | +// CreateSelfSignedTLSCertificate creates a self-signed cert the server can use to serve TLS. |
| 123 | +// Original code: https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/8d01161ec48d6b49cd371f179551b35da46e6fd6/internal/tls/tls.go |
| 124 | +func CreateSelfSignedTLSCertificate() (tls.Certificate, error) { |
| 125 | + certPEM, keyPEM, err := CreateSelfSignedTLSCertificatePEM() |
| 126 | + if err != nil { |
| 127 | + return tls.Certificate{}, err |
| 128 | + } |
| 129 | + return tls.X509KeyPair(certPEM, keyPEM) |
| 130 | +} |
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