decrypt.go

// +build !nodecrypt

package main

import (
	"bytes"

	plist "github.com/DHowett/go-plist"
	iosbackup "github.com/gwatts/ios/backup"
	"github.com/gwatts/ios/keychain"
)

var (
	decryptEnabled = true
)

func decrypt(backupDir string, b *backup) {
	pw := getpw()
	if pw == "" {
		b.Status = msgIsEncrypted
		return
	}
	encbw, err := iosbackup.Open(backupDir)
	if err != nil {
		b.Status = "Failed to open backup: " + err.Error()
		return
	}
	if err := encbw.SetPassword(pw); err != nil {
		b.Status = msgIncorrectPassword
		return
	}
	if err := encbw.Load(); err != nil {
		b.Status = err.Error()
		return
	}
	if b.isIOS12() {
		b.UsesScreenTime = true
		kc, err := keychain.Load(encbw)
		if err != nil {
			b.Status = msgKeychainLoadFailed
			return
		}
		b.Keychain = kc
	} else {
		rec := encbw.RecordById(restrictionsPlistName)
		if rec == nil {
			b.Status = msgNoPassword
			return
		}
		data, err := encbw.ReadFile(*rec)
		if err != nil {
			b.Status = msgIncorrectPassword
			return
		}
		buf := bytes.NewReader(data)
		if err := plist.NewDecoder(buf).Decode(&b.Restrictions); err != nil {
			b.Status = msgIncorrectPassword
			return
		}
	}

}