feat(keys): add cross-host master key export (#599)

cmd/hack-browser-data/keys.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"github.com/moond4rk/hackbrowserdata/browser"
+	"github.com/moond4rk/hackbrowserdata/log"
+)
+
+func keysCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "keys",
+		Short: "Manage cross-host master keys",
+	}
+	cmd.AddCommand(keysExportCmd())
+	return cmd
+}
+
+func keysExportCmd() *cobra.Command {
+	var (
+		browserName string
+		outputPath  string
+		keychainPw  string
+	)
+
+	cmd := &cobra.Command{
+		Use:   "export",
+		Short: "Export Chromium master keys as JSON for cross-host decryption",
+		Example: `  hack-browser-data keys export -o dump.json
+  hack-browser-data keys export -b chrome`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			browsers, err := browser.PickBrowsers(browser.PickOptions{
+				Name:             browserName,
+				KeychainPassword: keychainPw,
+			})
+			if err != nil {
+				return err
+			}
+
+			dump := browser.BuildDump(browsers)
+			log.Infof("Exported keys for %d vault(s)", len(dump.Vaults))
+
+			if outputPath == "" {
+				return dump.WriteJSON(os.Stdout)
+			}
+			f, err := os.OpenFile(outputPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+			if err != nil {
+				return fmt.Errorf("create %s: %w", outputPath, err)
+			}
+			defer f.Close()
+			return dump.WriteJSON(f)
+		},
+	}
+
+	cmd.Flags().StringVarP(&browserName, "browser", "b", "all", "target browser: all|"+browser.Names())
+	cmd.Flags().StringVarP(&outputPath, "output", "o", "", "output file (default: stdout)")
+	cmd.Flags().StringVar(&keychainPw, "keychain-pw", "", "macOS keychain password")
+
+	return cmd
+}

cmd/hack-browser-data/main.go

@@ -31,7 +31,7 @@ GitHub: https://github.com/moonD4rk/HackBrowserData`,
 	root.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "enable debug logging")
 
 	dump := dumpCmd()
-	root.AddCommand(dump, listCmd(), versionCmd())
+	root.AddCommand(dump, listCmd(), keysCmd(), versionCmd())
 
 	// Default to dump when no subcommand is given.
 	// Copy dump flags to root so that `hack-browser-data -b chrome`