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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "log" |
| 6 | + "os" |
| 7 | + "os/exec" |
| 8 | + "path/filepath" |
| 9 | + "strings" |
| 10 | + |
| 11 | + "github.com/bazelbuild/rules_go/go/runfiles" |
| 12 | +) |
| 13 | + |
| 14 | +// Wrapper for wasmsign2 WASM component |
| 15 | +// Resolves symlinks to real paths and calls wasmtime with limited directory access |
| 16 | +func main() { |
| 17 | + if len(os.Args) < 2 { |
| 18 | + log.Fatal("Usage: wasmsign2_wrapper <command> [args...]") |
| 19 | + } |
| 20 | + |
| 21 | + // Check for --bazel-marker-file flag (internal use only) |
| 22 | + var markerFile string |
| 23 | + filteredArgs := make([]string, 0, len(os.Args)) |
| 24 | + for i, arg := range os.Args { |
| 25 | + if strings.HasPrefix(arg, "--bazel-marker-file=") { |
| 26 | + markerFile = strings.TrimPrefix(arg, "--bazel-marker-file=") |
| 27 | + } else if i > 0 { // Skip program name |
| 28 | + filteredArgs = append(filteredArgs, arg) |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + // Initialize Bazel runfiles |
| 33 | + r, err := runfiles.New() |
| 34 | + if err != nil { |
| 35 | + log.Fatalf("Failed to initialize runfiles: %v", err) |
| 36 | + } |
| 37 | + |
| 38 | + // Locate wasmtime binary |
| 39 | + wasmtimeBinary, err := r.Rlocation("+wasmtime+wasmtime_toolchain/wasmtime") |
| 40 | + if err != nil { |
| 41 | + log.Fatalf("Failed to locate wasmtime: %v", err) |
| 42 | + } |
| 43 | + |
| 44 | + if _, err := os.Stat(wasmtimeBinary); err != nil { |
| 45 | + log.Fatalf("Wasmtime binary not found at %s: %v", wasmtimeBinary, err) |
| 46 | + } |
| 47 | + |
| 48 | + // Locate wasmsign2 WASM component |
| 49 | + wasmsign2Wasm, err := r.Rlocation("+_repo_rules+wasmsign2_cli_wasm/file/wasmsign2.wasm") |
| 50 | + if err != nil { |
| 51 | + log.Fatalf("Failed to locate wasmsign2.wasm: %v", err) |
| 52 | + } |
| 53 | + |
| 54 | + if _, err := os.Stat(wasmsign2Wasm); err != nil { |
| 55 | + log.Fatalf("wasmsign2.wasm not found at %s: %v", wasmsign2Wasm, err) |
| 56 | + } |
| 57 | + |
| 58 | + // Parse command |
| 59 | + command := filteredArgs[0] |
| 60 | + cmdArgs := filteredArgs[1:] |
| 61 | + |
| 62 | + // Resolve all file paths in arguments to real paths |
| 63 | + resolvedArgs, dirs, err := resolvePathsInArgs(command, cmdArgs) |
| 64 | + if err != nil { |
| 65 | + log.Fatalf("Failed to resolve paths: %v", err) |
| 66 | + } |
| 67 | + |
| 68 | + // Build wasmtime command with directory mappings |
| 69 | + wasmtimeArgs := []string{ |
| 70 | + "run", |
| 71 | + "-S", "cli", |
| 72 | + "-S", "http", |
| 73 | + } |
| 74 | + |
| 75 | + // Add unique directory mappings |
| 76 | + uniqueDirs := uniqueStrings(dirs) |
| 77 | + for _, dir := range uniqueDirs { |
| 78 | + wasmtimeArgs = append(wasmtimeArgs, "--dir", dir) |
| 79 | + } |
| 80 | + |
| 81 | + // Add wasmsign2.wasm and command with resolved arguments |
| 82 | + wasmtimeArgs = append(wasmtimeArgs, wasmsign2Wasm, command) |
| 83 | + wasmtimeArgs = append(wasmtimeArgs, resolvedArgs...) |
| 84 | + |
| 85 | + // Execute wasmtime |
| 86 | + cmd := exec.Command(wasmtimeBinary, wasmtimeArgs...) |
| 87 | + cmd.Stdout = os.Stdout |
| 88 | + cmd.Stderr = os.Stderr |
| 89 | + cmd.Stdin = os.Stdin |
| 90 | + |
| 91 | + if err := cmd.Run(); err != nil { |
| 92 | + if exitErr, ok := err.(*exec.ExitError); ok { |
| 93 | + os.Exit(exitErr.ExitCode()) |
| 94 | + } |
| 95 | + log.Fatalf("Failed to execute wasmtime: %v", err) |
| 96 | + } |
| 97 | + |
| 98 | + // If marker file was requested, create it on success |
| 99 | + if markerFile != "" { |
| 100 | + if err := os.WriteFile(markerFile, []byte("Verification passed\n"), 0644); err != nil { |
| 101 | + log.Fatalf("Failed to write marker file: %v", err) |
| 102 | + } |
| 103 | + } |
| 104 | +} |
| 105 | + |
| 106 | +// resolvePathsInArgs resolves file paths in command arguments |
| 107 | +// Returns resolved arguments and list of directories to map |
| 108 | +func resolvePathsInArgs(command string, args []string) ([]string, []string, error) { |
| 109 | + resolvedArgs := make([]string, 0, len(args)) |
| 110 | + dirs := make([]string, 0) |
| 111 | + |
| 112 | + // Track which flags expect file paths |
| 113 | + pathFlags := map[string]bool{ |
| 114 | + "-i": true, "--input": true, |
| 115 | + "-o": true, "--output": true, |
| 116 | + "-k": true, "--secret-key": true, |
| 117 | + "-K": true, "--public-key": true, |
| 118 | + "-S": true, "--signature": true, |
| 119 | + "--public-key-name": true, |
| 120 | + "--secret-key-name": true, |
| 121 | + } |
| 122 | + |
| 123 | + for i := 0; i < len(args); i++ { |
| 124 | + arg := args[i] |
| 125 | + |
| 126 | + // Check if this is a flag that expects a path |
| 127 | + if pathFlags[arg] && i+1 < len(args) { |
| 128 | + // Next argument is a file path |
| 129 | + resolvedArgs = append(resolvedArgs, arg) |
| 130 | + i++ |
| 131 | + path := args[i] |
| 132 | + |
| 133 | + // Resolve to real path |
| 134 | + realPath, err := filepath.EvalSymlinks(path) |
| 135 | + if err != nil { |
| 136 | + // If symlink evaluation fails, try absolute path |
| 137 | + realPath, err = filepath.Abs(path) |
| 138 | + if err != nil { |
| 139 | + return nil, nil, fmt.Errorf("failed to resolve path %s: %w", path, err) |
| 140 | + } |
| 141 | + } |
| 142 | + |
| 143 | + resolvedArgs = append(resolvedArgs, realPath) |
| 144 | + |
| 145 | + // Add directory for mapping |
| 146 | + dir := filepath.Dir(realPath) |
| 147 | + dirs = append(dirs, dir) |
| 148 | + } else if strings.Contains(arg, "=") && (strings.HasPrefix(arg, "--public-key-name=") || |
| 149 | + strings.HasPrefix(arg, "--secret-key-name=") || |
| 150 | + strings.HasPrefix(arg, "-i=") || strings.HasPrefix(arg, "-o=") || |
| 151 | + strings.HasPrefix(arg, "-k=") || strings.HasPrefix(arg, "-K=") || |
| 152 | + strings.HasPrefix(arg, "-S=")) { |
| 153 | + // Handle --flag=value format |
| 154 | + parts := strings.SplitN(arg, "=", 2) |
| 155 | + if len(parts) == 2 { |
| 156 | + flag := parts[0] |
| 157 | + path := parts[1] |
| 158 | + |
| 159 | + realPath, err := filepath.EvalSymlinks(path) |
| 160 | + if err != nil { |
| 161 | + realPath, err = filepath.Abs(path) |
| 162 | + if err != nil { |
| 163 | + return nil, nil, fmt.Errorf("failed to resolve path %s: %w", path, err) |
| 164 | + } |
| 165 | + } |
| 166 | + |
| 167 | + resolvedArgs = append(resolvedArgs, flag+"="+realPath) |
| 168 | + |
| 169 | + dir := filepath.Dir(realPath) |
| 170 | + dirs = append(dirs, dir) |
| 171 | + } else { |
| 172 | + resolvedArgs = append(resolvedArgs, arg) |
| 173 | + } |
| 174 | + } else { |
| 175 | + // Not a path argument, pass through as-is |
| 176 | + resolvedArgs = append(resolvedArgs, arg) |
| 177 | + } |
| 178 | + } |
| 179 | + |
| 180 | + return resolvedArgs, dirs, nil |
| 181 | +} |
| 182 | + |
| 183 | +// uniqueStrings returns unique strings from a slice |
| 184 | +func uniqueStrings(strs []string) []string { |
| 185 | + seen := make(map[string]bool) |
| 186 | + result := make([]string, 0, len(strs)) |
| 187 | + |
| 188 | + for _, s := range strs { |
| 189 | + if !seen[s] { |
| 190 | + seen[s] = true |
| 191 | + result = append(result, s) |
| 192 | + } |
| 193 | + } |
| 194 | + |
| 195 | + return result |
| 196 | +} |
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