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The examiner today will typically see either a XML or binary format. Originally Apple used the NeXSTEP format or a binary format for these files, but this was deprecated and a new XLM format was introduced. The Property List (plist) is data file used to store various types of data on iOS and OSX. Many of the native iOS applications such as Calendar, Text Messages, Notes, Photos, and Address Book utilize this database structure to store and organize their data. The format for this database is compact and contains some nice functionality for its size:because of these features the iOS development community has embraced SQLite. The SQLite data format is a popular format for mobile devices and open source applications: is a relational database that can be completely contained in a small C programming library.
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Into the “data partition” iOS stores, along with user’s file (photo, video, music), a lot of system and configuration files, useful during the analysis process.Ĭonfiguration files are store in two format: The second partition will contain user data and applications and will be the focus of most forensic investigations.
#AUTOPSY EMAIL PARSER UPGRADE#
This partition contains only system files, upgrade files and basic applications.
#AUTOPSY EMAIL PARSER FULL#
A boot loader can find the startup file without full knowledge of the volume format.įirst partition is read only and contains the firmware: it can be written only during a firmware update. The startup file is a special file that holds information needed when booting a system that does not have built-in support for HFS+. If the first extent of the attributes file (stored in the volume header) has zero allocation blocks, the attributes file does not exist. It is possible for a volume to have no attributes file. An attributes files has a variable length key and three data record types, which makes it roughly as complex as the catalog file. It is a special file, described by an HFSPlusForkData record in the volume header, with no entry in the catalog file. The attributes file is reserved for implementing named forks in the future. Each file created is assigned a catalog ID number. The nodes are grouped together in a linear fashion to add speed to the process. This catalog (a balanced tree) utilizes nodes to reference folders and files, and maintains the hierarchy of header, index, leaf and map nodes. The catalog file contains metadata about all the files and folders, including information on modified, access, and created times. The catalog file describes the folder and file hierarchy on a volume. This information is stored in a balanced tree format. The information recorded lists all extents used by a file and its’ allocated blocks in the proper order. This file tracks all allocation blocks that belongs to a file. The allocation file does not have to be stored contiguously within a volume.
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The file specifies whether an allocation block is free by storing this data in a bitmap, specifying a free allocation block with a " clear bit" (zero). The purpose of the allocation file is to track which allocation blocks are used by the system or are free. The Volume Header stores a wide variety of data about the volume itself, for example the size of allocation blocks, a timestamp that indicates when the volume was created or the location of other volume structures such as the Catalog File or Extent Overflow File. A backup of the volume header can be found in the last 1024 bytes of the volume, primarily used for disk repair if the original header is damaged.
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The volume header is utilized to contain information about the structure of the HFS volume and is composed by the 1024 bytes after the reserved set of boot blocks on the partition.
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Sectors 0 and 1 of the volume are the boot blocks. The structures of this file system include a volume header, allocation file, extents overflow file, catalog file, attributes file and a startup file