initial code for dumping imessages in a reasonable format
This commit is contained in:
Jeffrey Paul
315
dump-imessages/iphone-dataprotection/python_scripts/hfs/hfs.py
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315
dump-imessages/iphone-dataprotection/python_scripts/hfs/hfs.py
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from btree import AttributesTree, CatalogTree, ExtentsOverflowTree
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from structs import *
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from util import write_file
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from util.bdev import FileBlockDevice
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import datetime
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import hashlib
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import os
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import struct
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import sys
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import zlib
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def hfs_date(t):
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return datetime.datetime(1904,1,1) + datetime.timedelta(seconds=t)
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class HFSFile(object):
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def __init__(self, volume, hfsplusfork, fileID, deleted=False):
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self.volume = volume
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self.blockSize = volume.blockSize
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self.fileID = fileID
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self.totalBlocks = hfsplusfork.totalBlocks
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self.logicalSize = hfsplusfork.logicalSize
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self.extents = volume.getAllExtents(hfsplusfork, fileID)
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self.deleted = deleted
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def readAll(self, outputfile, truncate=True):
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f = open(outputfile, "wb")
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for i in xrange(self.totalBlocks):
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f.write(self.readBlock(i))
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if truncate:
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f.truncate(self.logicalSize)
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f.close()
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def readAllBuffer(self, truncate=True):
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r = ""
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for i in xrange(self.totalBlocks):
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r += self.readBlock(i)
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if truncate:
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r = r[:self.logicalSize]
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return r
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def processBlock(self, block, lba):
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return block
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def readBlock(self, n):
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bs = self.volume.blockSize
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if n*bs > self.logicalSize:
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return "BLOCK OUT OF BOUNDS" + "\xFF" * (bs - len("BLOCK OUT OF BOUNDS"))
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bc = 0
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for extent in self.extents:
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bc += extent.blockCount
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if n < bc:
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lba = extent.startBlock+(n-(bc-extent.blockCount))
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if not self.deleted and self.fileID != kHFSAllocationFileID and not self.volume.isBlockInUse(lba):
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print "FAIL, block %x not marked as used" % n
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return self.processBlock(self.volume.readBlock(lba), lba)
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return ""
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def getLBAforBlock(self, n):
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bc = 0
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for extent in self.extents:
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bc += extent.blockCount
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if n < bc:
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return extent.startBlock+(n-(bc-extent.blockCount))
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def writeBlock(self, n, data):
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bs = self.volume.blockSize
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if n*bs > self.logicalSize:
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raise Exception("writeBlock, out of bounds %d" % n)
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bc = 0
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for extent in self.extents:
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bc += extent.blockCount
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if n < bc:
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lba = extent.startBlock+(n-(bc-extent.blockCount))
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self.volume.writeBlock(lba, data)
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return
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class HFSCompressedResourceFork(HFSFile):
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def __init__(self, volume, hfsplusfork, fileID):
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super(HFSCompressedResourceFork,self).__init__(volume, hfsplusfork, fileID)
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block0 = self.readBlock(0)
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self.header = HFSPlusCmpfRsrcHead.parse(block0)
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print self.header
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self.blocks = HFSPlusCmpfRsrcBlockHead.parse(block0[self.header.headerSize:])
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print "HFSCompressedResourceFork numBlocks:", self.blocks.numBlocks
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#HAX, readblock not implemented
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def readAllBuffer(self):
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buff = super(HFSCompressedResourceFork, self).readAllBuffer()
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r = ""
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base = self.header.headerSize + 4
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for b in self.blocks.HFSPlusCmpfRsrcBlock:
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r += zlib.decompress(buff[base+b.offset:base+b.offset+b.size])
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return r
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class HFSVolume(object):
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def __init__(self, bdev):
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self.bdev = bdev
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try:
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data = self.bdev.readBlock(0)
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self.header = HFSPlusVolumeHeader.parse(data[0x400:0x800])
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assert self.header.signature == 0x4858 or self.header.signature == 0x482B
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except:
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raise
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#raise Exception("Not an HFS+ image")
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self.blockSize = self.header.blockSize
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self.bdev.setBlockSize(self.blockSize)
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#if os.path.getsize(filename) < self.header.totalBlocks * self.blockSize:
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# print "WARNING: HFS image appears to be truncated"
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self.allocationFile = HFSFile(self, self.header.allocationFile, kHFSAllocationFileID)
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self.allocationBitmap = self.allocationFile.readAllBuffer()
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self.extentsFile = HFSFile(self, self.header.extentsFile, kHFSExtentsFileID)
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self.extentsTree = ExtentsOverflowTree(self.extentsFile)
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self.catalogFile = HFSFile(self, self.header.catalogFile, kHFSCatalogFileID)
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self.xattrFile = HFSFile(self, self.header.attributesFile, kHFSAttributesFileID)
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self.catalogTree = CatalogTree(self.catalogFile, self)
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self.xattrTree = AttributesTree(self.xattrFile)
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self.hasJournal = self.header.attributes & (1 << kHFSVolumeJournaledBit)
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def readBlock(self, b):
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return self.bdev.readBlock(b)
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def writeBlock(self, lba, data):
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return self.bdev.writeBlock(lba, data)
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def volumeID(self):
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return struct.pack(">LL", self.header.finderInfo[6], self.header.finderInfo[7])
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def isBlockInUse(self, block):
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thisByte = ord(self.allocationBitmap[block / 8])
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return (thisByte & (1 << (7 - (block % 8)))) != 0
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def unallocatedBlocks(self):
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for i in xrange(self.header.totalBlocks):
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if not self.isBlockInUse(i):
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yield i, self.read(i*self.blockSize, self.blockSize)
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def getExtentsOverflowForFile(self, fileID, startBlock, forkType=kForkTypeData):
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return self.extentsTree.searchExtents(fileID, forkType, startBlock)
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def getXattr(self, fileID, name):
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return self.xattrTree.searchXattr(fileID, name)
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def getFileByPath(self, path):
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return self.catalogTree.getRecordFromPath(path)
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def getFileIDByPath(self, path):
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key, record = self.catalogTree.getRecordFromPath(path)
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if not record:
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return
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if record.recordType == kHFSPlusFolderRecord:
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return record.data.folderID
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return record.data.fileID
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def listFolderContents(self, path):
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k,v = self.catalogTree.getRecordFromPath(path)
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if not k or v.recordType != kHFSPlusFolderRecord:
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return
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for k,v in self.catalogTree.getFolderContents(v.data.folderID):
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if v.recordType == kHFSPlusFolderRecord:
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#.HFS+ Private Directory Data\r
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print v.data.folderID, getString(k).replace("\r","") + "/"
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elif v.recordType == kHFSPlusFileRecord:
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print v.data.fileID, getString(k)
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def ls(self, path):
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k,v = self.catalogTree.getRecordFromPath(path)
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return self._ls(k, v)
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def _ls(self, k, v):
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res = {}
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if not k or v.recordType != kHFSPlusFolderRecord:
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return None
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for k,v in self.catalogTree.getFolderContents(v.data.folderID):
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if v.recordType == kHFSPlusFolderRecord:
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#.HFS+ Private Directory Data\r
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res[getString(k).replace("\r","") + "/"] = v.data
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elif v.recordType == kHFSPlusFileRecord:
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res[getString(k)] = v.data
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return res
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def listXattrs(self, path):
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k,v = self.catalogTree.getRecordFromPath(path)
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if k and v.recordType == kHFSPlusFileRecord:
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return self.xattrTree.getAllXattrs(v.data.fileID)
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elif k and v.recordType == kHFSPlusFolderThreadRecord:
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return self.xattrTree.getAllXattrs(v.data.folderID)
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def readFileByRecord(self, record):
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assert record.recordType == kHFSPlusFileRecord
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xattr = self.getXattr(record.data.fileID, "com.apple.decmpfs")
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data = None
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if xattr:
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decmpfs = HFSPlusDecmpfs.parse(xattr)
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if decmpfs.compression_type == 1:
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return xattr[16:]
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elif decmpfs.compression_type == 3:
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if decmpfs.uncompressed_size == len(xattr) - 16:
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return xattr[16:]
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return zlib.decompress(xattr[16:])
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elif decmpfs.compression_type == 4:
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f = HFSCompressedResourceFork(self, record.data.resourceFork, record.data.fileID)
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data = f.readAllBuffer()
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return data
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f = HFSFile(self, record.data.dataFork, record.data.fileID)
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return f.readAllBuffer()
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#TODO: returnString compress
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def readFile(self, path, outFolder="./", returnString=False):
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k,v = self.catalogTree.getRecordFromPath(path)
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if not v:
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print "File %s not found" % path
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return
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assert v.recordType == kHFSPlusFileRecord
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xattr = self.getXattr(v.data.fileID, "com.apple.decmpfs")
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if xattr:
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decmpfs = HFSPlusDecmpfs.parse(xattr)
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if decmpfs.compression_type == 1:
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return xattr[16:]
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elif decmpfs.compression_type == 3:
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if decmpfs.uncompressed_size == len(xattr) - 16:
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z = xattr[16:]
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else:
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z = zlib.decompress(xattr[16:])
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open(outFolder + os.path.basename(path), "wb").write(z)
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return
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elif decmpfs.compression_type == 4:
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f = HFSCompressedResourceFork(self, v.data.resourceFork, v.data.fileID)
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z = f.readAllBuffer()
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open(outFolder + os.path.basename(path), "wb").write(z)
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return z
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f = HFSFile(self, v.data.dataFork, v.data.fileID)
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if returnString:
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return f.readAllBuffer()
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else:
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f.readAll(outFolder + os.path.basename(path))
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def readJournal(self):
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#jb = self.read(self.header.journalInfoBlock * self.blockSize, self.blockSize)
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#jib = JournalInfoBlock.parse(jb)
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#return self.read(jib.offset,jib.size)
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return self.readFile("/.journal", returnString=True)
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def listAllFileIds(self):
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self.fileids={}
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self.catalogTree.traverseLeafNodes(callback=self.grabFileId)
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return self.fileids
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def grabFileId(self, k,v):
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if v.recordType == kHFSPlusFileRecord:
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self.fileids[v.data.fileID] = True
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def getFileRecordForFileID(self, fileID):
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k,v = self.catalogTree.searchByCNID(fileID)
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return v
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def getFullPath(self, fileID):
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k,v = self.catalogTree.search((fileID, ""))
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if not k:
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print "File ID %d not found" % fileID
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return ""
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p = getString(v.data)
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while k:
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k,v = self.catalogTree.search((v.data.parentID, ""))
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if k.parentID == kHFSRootFolderID:
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break
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p = getString(v.data) + "/" + p
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return "/" + p
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def getFileRecordForPath(self, path):
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k,v = self.catalogTree.getRecordFromPath(path)
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if not k:
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return
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return v.data
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def getAllExtents(self, hfsplusfork, fileID):
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b = 0
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extents = []
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for extent in hfsplusfork.HFSPlusExtentDescriptor:
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extents.append(extent)
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b += extent.blockCount
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while b != hfsplusfork.totalBlocks:
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k,v = self.getExtentsOverflowForFile(fileID, b)
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if not v:
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print "extents overflow missing, startblock=%d" % b
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break
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for extent in v:
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extents.append(extent)
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b += extent.blockCount
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return extents
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def dohashFiles(self, k,v):
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if v.recordType == kHFSPlusFileRecord:
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filename = getString(k)
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f = HFSFile(self, v.data.dataFork, v.data.fileID)
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print filename, hashlib.sha1(f.readAllBuffer()).hexdigest()
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def hashFiles(self):
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self.catalogTree.traverseLeafNodes(callback=self.dohashFiles)
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if __name__ == "__main__":
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v = HFSVolume("myramdisk.dmg",offset=0x40)
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v.listFolderContents("/")
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print v.readFile("/usr/local/share/restore/imeisv_svn.plist")
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print v.listXattrs("/usr/local/share/restore/imeisv_svn.plist")
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