iPhone手机数据提取分析（一）

原始backup数据的提取

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1. 一直觉得微信聊天记录备份是一个麻烦事情，最近发现微信占用的空间越来越大，又舍不得删除，想着能够实现自动化备份微信聊天记录等信息。在互联网上看到有可以备份微信聊天记录的工具，但是是收费的。我觉得既然别人能备份，我们自己也应该可以试着做到。
2. google了下，发现可以通过iTunes来备份手机数据。备份后，数据会保存在~/Library/Application Support/MobileSync/Backup目录下面。可以通过shift+command+g 然后输入地址直接跳转到该目录下。该目录下有备份的文件夹，随便选一个，进入之后，里面有：Info.plist、Manifest.mbdb、Manifest.plist、Status.plist等文件。
3. 通过对这些数据进行分析，觉得Manifest.mbdb应该是一个数据库一样的文件，存储着各种信息，所以查了下怎么解析这个文件。
4. 通过对Manifest.mbdb解析，看到了很多的文件以及对应的目录。这些应该就是备份的文件列表。然后试着对这些列表进行还原。通过Manifest.mbdb可以得到当前目录里面的这些文件对应关系。然后根据这些文件的信息，进行还原。

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提取数据的Python脚本

#!/usr/bin/env python

#~/Library/Application Support/MobileSync/Backup

import sys
import os
import hashlib
import shutil

mbdx = {}
dict = {}

def getint(data, offset, intsize):
    """Retrieve an integer (big-endian) and new offset from the current offset"""
    value = 0
    while intsize > 0:
        value = (value<<8) + ord(data[offset])
        offset = offset + 1
        intsize = intsize - 1
    return value, offset

def getstring(data, offset):
    """Retrieve a string and new offset from the current offset into the data"""
    if data[offset] == chr(0xFF) and data[offset+1] == chr(0xFF):
        return '', offset+2 # Blank string
    length, offset = getint(data, offset, 2) # 2-byte length
    value = data[offset:offset+length]
    return value, (offset + length)

def process_mbdb_file(filename):
    mbdb = {} # Map offset of info in this file => file info
    data = open(filename).read()
    if data[0:4] != "mbdb": raise Exception("This does not look like an MBDB file")
    offset = 4
    offset = offset + 2 # value x05 x00, not sure what this is
    while offset < len(data):
        fileinfo = {}
        fileinfo['start_offset'] = offset
        fileinfo['domain'], offset = getstring(data, offset)
        fileinfo['filename'], offset = getstring(data, offset)
        fileinfo['linktarget'], offset = getstring(data, offset)
        fileinfo['datahash'], offset = getstring(data, offset)
        fileinfo['unknown1'], offset = getstring(data, offset)
        fileinfo['mode'], offset = getint(data, offset, 2)
        fileinfo['unknown2'], offset = getint(data, offset, 4)
        fileinfo['unknown3'], offset = getint(data, offset, 4)
        fileinfo['userid'], offset = getint(data, offset, 4)
        fileinfo['groupid'], offset = getint(data, offset, 4)
        fileinfo['mtime'], offset = getint(data, offset, 4)
        fileinfo['atime'], offset = getint(data, offset, 4)
        fileinfo['ctime'], offset = getint(data, offset, 4)
        fileinfo['filelen'], offset = getint(data, offset, 8)
        fileinfo['flag'], offset = getint(data, offset, 1)
        fileinfo['numprops'], offset = getint(data, offset, 1)
        fileinfo['properties'] = {}
        for ii in range(fileinfo['numprops']):
            propname, offset = getstring(data, offset)
            propval, offset = getstring(data, offset)
            fileinfo['properties'][propname] = propval
        mbdb[fileinfo['start_offset']] = fileinfo
        fullpath = fileinfo['domain'] + '-' + fileinfo['filename']
        id = hashlib.sha1(fullpath)
        mbdx[fileinfo['start_offset']] = id.hexdigest()
    return mbdb

def modestr(val):
    def mode(val):
        if (val & 0x4): r = 'r'
        else: r = '-'
        if (val & 0x2): w = 'w'
        else: w = '-'
        if (val & 0x1): x = 'x'
        else: x = '-'
        return r+w+x
    return mode(val>>6) + mode((val>>3)) + mode(val)

def fileinfo_str(f, verbose=False):
    # if not verbose: return "(%s)%s::%s" % (f['fileID'], f['domain'], f['filename'])
    dict[f['fileID']] = f['filename']
    if not verbose: return "%s => %s (%s)" % (f['fileID'], f['filename'], f['domain'])
    if (f['mode'] & 0xE000) == 0xA000: type = 'l' # symlink
    elif (f['mode'] & 0xE000) == 0x8000: type = '-' # file
    elif (f['mode'] & 0xE000) == 0x4000: type = 'd' # dir
    else: 
        print >> sys.stderr, "Unknown file type %04x for %s" % (f['mode'], fileinfo_str(f, False))
        type = '?' # unknown
    info = ("%s%s %08x %08x %7d %10d %10d %10d (%s)%s::%s" % 
            (type, modestr(f['mode']&0x0FFF) , f['userid'], f['groupid'], f['filelen'], 
             f['mtime'], f['atime'], f['ctime'], f['fileID'], f['domain'], f['filename']))
    if type == 'l': info = info + ' -> ' + f['linktarget'] # symlink destination
    for name, value in f['properties'].items(): # extra properties
        info = info + ' ' + name + '=' + repr(value)
    return info

verbose = True
if __name__ == '__main__':

    if len(sys.argv)!=3:
         print "\nUsage: Python iOS-Corrupted-Backup-Reader.py [Full path to backup directory] [Full path to output directory]\n"
         print "Example: Python iOS-Corrupted-Backup-Reader.py c:\backup c:\output"
         sys.exit(0)

    backuppath=sys.argv[1]   
    outputpath=sys.argv[2]

    if os.path.exists(backuppath)==0:
        print "Backup directory not found."
        sys.exit(0)

    if os.path.exists(outputpath)==0:
        print "Output directory not found. Create the directory before running the script."
        sys.exit(0)

    if backuppath[:-1]!='/':
        backuppath=backuppath+'/'

    if outputpath[:-1]!='/':
        outputpath=outputpath+'/'


    mbdb = process_mbdb_file(backuppath+"Manifest.mbdb")

    for offset, fileinfo in mbdb.items():
        if offset in mbdx:
            fileinfo['fileID'] = mbdx[offset]
        else:
            fileinfo['fileID'] = ""
            print >> sys.stderr, "No fileID found for %s" % fileinfo_str(fileinfo)
        print fileinfo_str(fileinfo)




    folder=os.listdir(backuppath)
    for fname in folder:
        ffullname=backuppath+fname
        if fname in dict: 
                tmp=dict[fname]
                odir,oname=tmp[:tmp.rfind('/')],tmp[tmp.rfind('/')+1:]
                if os.path.exists(outputpath+odir)==0:
                    os.makedirs(outputpath+odir)
                    print ">>makedirs "+outputpath+odir 
                try:
                    shutil.copy(ffullname,outputpath+odir+'/'+oname)
                    print ">>copy from "+ffullname+" to "+outputpath+odir+'/'+oname 
                except:
                    pass

    folder=os.listdir(backuppath)
    for fname in folder:

        ffullname=backuppath+fname
        print "handler "+ffullname
        f=open(ffullname,'rb')
        ftype=f.read(15)
        f.close()
        try:
            if os.path.exists(outputpath+'other-data')==0:  
                os.makedirs(outputpath+'other-data')
            if ftype.find('bplist')!=-1 or ftype.find(')!=-1:
                mtype='.plist'  
            if ftype.find('SQLite')!=-1:
                mtype='.sqlitedb'
            if ftype.find('JFIF')!=-1 or ftype.find('Exif')!=-1:
                mtype='.jpeg'
            if ftype.find('PNG')!=-1:
                mtype='.png'
            if ftype.find('cook')!=-1:
                mtype='.binarycookies'
            if ftype.find('ftypqt')!=-1:
                mtype='.mov'
            if ftype.find('ID3')!=-1:
                mtype='.mp3'

            file_path=outputpath+'other-data'+'/'+fname+mtype

            if(os.path.exists(file_path)==False):
                shutil.copy(ffullname,file_path) 
                print ">>copy from "+ffullname+" to "+file_path 
            else:
                outfilename=outputpath+'other-data'+'/'+fname+str(randrange(0,1000))+mtype
                shutil.copy(ffullname,outfilename)
                print ">>copy from "+ffullname+" to "+outfilename 
        except:
            pass

    print "Files successfully moved to"+outputpath

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说明：

手机备份的文件所在路径：
~/Library/Application Support/MobileSync/Backup
执行样例：
Python ReadiPhoneBackupData.py/Library/Application Support/MobileSync/Backup/xxx /Users/xxx/Desktop/xxx