| 1 | package update |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "crypto/sha256" |
| 6 | "encoding/hex" |
| 7 | "encoding/json" |
| 8 | "fmt" |
| 9 | "io" |
| 10 | "strings" |
| 11 | ) |
| 12 | |
| 13 | const ( |
| 14 | WindowsPayloadManifestSchemaVersion = 1 |
| 15 | WindowsPayloadManifestName = "reasonix-payload.json" |
| 16 | WindowsPayloadSignatureName = WindowsPayloadManifestName + ".minisig" |
| 17 | ) |
| 18 | |
| 19 | var windowsPayloadFileNames = [...]string{ |
| 20 | "reasonix-desktop.exe", |
| 21 | "reasonix-guard.exe", |
| 22 | "reasonix-launcher.exe", |
| 23 | "reasonix-update-helper.exe", |
| 24 | "reasonix-cli.exe", |
| 25 | } |
| 26 | |
| 27 | type WindowsPayloadManifest struct { |
| 28 | SchemaVersion int `json:"schemaVersion"` |
| 29 | Version string `json:"version"` |
| 30 | Files []WindowsPayloadManifestFile `json:"files"` |
| 31 | } |
| 32 | |
| 33 | type WindowsPayloadManifestFile struct { |
| 34 | Name string `json:"name"` |
| 35 | SHA256 string `json:"sha256"` |
| 36 | } |
| 37 | |
| 38 | func WindowsPayloadFileNames() []string { |
| 39 | return append([]string(nil), windowsPayloadFileNames[:]...) |
| 40 | } |
| 41 | |
| 42 | func EncodeWindowsPayloadManifest(version string, hashes map[string]string) ([]byte, error) { |
| 43 | version = strings.TrimSpace(version) |
| 44 | if version == "" { |
| 45 | return nil, fmt.Errorf("Windows payload manifest version is empty") |
| 46 | } |
| 47 | manifest := WindowsPayloadManifest{ |
| 48 | SchemaVersion: WindowsPayloadManifestSchemaVersion, |
| 49 | Version: version, |
| 50 | Files: make([]WindowsPayloadManifestFile, 0, len(windowsPayloadFileNames)), |
| 51 | } |
| 52 | for _, name := range windowsPayloadFileNames { |
| 53 | hash := strings.ToLower(strings.TrimSpace(hashes[name])) |
| 54 | if !validWindowsPayloadSHA256(hash) { |
| 55 | return nil, fmt.Errorf("Windows payload manifest hash for %s is invalid", name) |
| 56 | } |
| 57 | manifest.Files = append(manifest.Files, WindowsPayloadManifestFile{ |
| 58 | Name: name, |
| 59 | SHA256: hash, |
| 60 | }) |
| 61 | } |
| 62 | if len(hashes) != len(manifest.Files) { |
| 63 | return nil, fmt.Errorf("Windows payload manifest contains unexpected files") |
| 64 | } |
| 65 | b, err := json.MarshalIndent(manifest, "", " ") |
| 66 | if err != nil { |
| 67 | return nil, err |
| 68 | } |
| 69 | return append(b, '\n'), nil |
| 70 | } |
| 71 | |
| 72 | func DecodeWindowsPayloadManifest(data []byte, expectedVersion string) (map[string]string, error) { |
| 73 | var manifest WindowsPayloadManifest |
| 74 | dec := json.NewDecoder(bytes.NewReader(data)) |
| 75 | dec.DisallowUnknownFields() |
| 76 | if err := dec.Decode(&manifest); err != nil { |
| 77 | return nil, fmt.Errorf("decode Windows payload manifest: %w", err) |
| 78 | } |
| 79 | var trailing any |
| 80 | if err := dec.Decode(&trailing); err != io.EOF { |
| 81 | if err == nil { |
| 82 | return nil, fmt.Errorf("decode Windows payload manifest: trailing JSON value") |
| 83 | } |
| 84 | return nil, fmt.Errorf("decode Windows payload manifest: %w", err) |
| 85 | } |
| 86 | expectedVersion = strings.TrimSpace(expectedVersion) |
| 87 | if manifest.SchemaVersion != WindowsPayloadManifestSchemaVersion || |
| 88 | expectedVersion == "" || |
| 89 | manifest.Version != expectedVersion { |
| 90 | return nil, fmt.Errorf("Windows payload manifest identity does not match the pending update") |
| 91 | } |
| 92 | expected := make(map[string]struct{}, len(windowsPayloadFileNames)) |
| 93 | for _, name := range windowsPayloadFileNames { |
| 94 | expected[name] = struct{}{} |
| 95 | } |
| 96 | hashes := make(map[string]string, len(manifest.Files)) |
| 97 | for _, file := range manifest.Files { |
| 98 | name := file.Name |
| 99 | hash := file.SHA256 |
| 100 | if _, ok := expected[name]; !ok || !validWindowsPayloadSHA256(hash) { |
| 101 | return nil, fmt.Errorf("Windows payload manifest member is invalid") |
| 102 | } |
| 103 | if _, duplicate := hashes[name]; duplicate { |
| 104 | return nil, fmt.Errorf("Windows payload manifest contains duplicate members") |
| 105 | } |
| 106 | hashes[name] = hash |
| 107 | } |
| 108 | if len(hashes) != len(expected) { |
| 109 | return nil, fmt.Errorf("Windows payload manifest is incomplete") |
| 110 | } |
| 111 | return hashes, nil |
| 112 | } |
| 113 | |
| 114 | func WindowsPayloadSHA256(data []byte) string { |
| 115 | sum := sha256.Sum256(data) |
| 116 | return hex.EncodeToString(sum[:]) |
| 117 | } |
| 118 | |
| 119 | func validWindowsPayloadSHA256(value string) bool { |
| 120 | if len(value) != sha256.Size*2 { |
| 121 | return false |
| 122 | } |
| 123 | if value != strings.ToLower(value) { |
| 124 | return false |
| 125 | } |
| 126 | _, err := hex.DecodeString(value) |
| 127 | return err == nil |
| 128 | } |
| 129 |