61 lines
2.0 KiB
Go
61 lines
2.0 KiB
Go
package main
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import (
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"encoding/hex"
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"os"
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"strings"
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"github.com/rfjakob/gocryptfs/internal/cryptocore"
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"github.com/rfjakob/gocryptfs/internal/exitcodes"
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"github.com/rfjakob/gocryptfs/internal/readpassword"
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"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// unhexMasterKey - Convert a hex-encoded master key to binary.
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// Calls os.Exit on failure.
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func unhexMasterKey(masterkey string, fromStdin bool) []byte {
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masterkey = strings.Replace(masterkey, "-", "", -1)
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key, err := hex.DecodeString(masterkey)
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if err != nil {
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tlog.Fatal.Printf("Could not parse master key: %v", err)
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os.Exit(exitcodes.MasterKey)
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}
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if len(key) != cryptocore.KeyLen {
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tlog.Fatal.Printf("Master key has length %d but we require length %d", len(key), cryptocore.KeyLen)
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os.Exit(exitcodes.MasterKey)
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}
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tlog.Info.Printf("Using explicit master key.")
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if !fromStdin {
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tlog.Info.Printf(tlog.ColorYellow +
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"THE MASTER KEY IS VISIBLE VIA \"ps ax\" AND MAY BE STORED IN YOUR SHELL HISTORY!\n" +
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"ONLY USE THIS MODE FOR EMERGENCIES" + tlog.ColorReset)
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}
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return key
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}
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// handleArgsMasterkey looks at `args.masterkey` and `args.zerokey`, gets the
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// masterkey from the source the user wanted (string on the command line, stdin, all-zero),
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// and returns it in binary. Returns nil if no masterkey source was specified.
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func handleArgsMasterkey(args *argContainer) (masterkey []byte) {
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// "-masterkey=stdin"
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if args.masterkey == "stdin" {
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in := string(readpassword.Once(nil, "", "Masterkey"))
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return unhexMasterKey(in, true)
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}
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// "-masterkey=941a6029-3adc6a1c-..."
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if args.masterkey != "" {
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return unhexMasterKey(args.masterkey, false)
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}
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// "-zerokey"
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if args.zerokey {
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tlog.Info.Printf("Using all-zero dummy master key.")
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tlog.Info.Printf(tlog.ColorYellow +
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"ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING." +
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tlog.ColorReset)
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return make([]byte, cryptocore.KeyLen)
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}
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// No master key source specified on the command line. Caller must parse
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// the config file.
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return nil
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}
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