Add README and LICENSE + examples

LICENSE.MIT

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+Copyright 2019 Youness El Alaoui
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# MFSUtil 
+
+MFS and CFG file manipulation utility
+
+## Description
+
+This tool can be used to manipulate an MFS (ME File System) partition as well as the CFG files stored within.
+
+
+## Usage
+
+The tool does one operation per run, so for most things, multiple calls will be necessary. See the examples folder for potential uses.
+
+The manipulation of either MFS or CFG files are mutually exclusive.
+
+```
+usage: MFSUtil.py [-h] [-o FILE] [-i ID] [-f PATH] [--mode MODE] [--opt OPT]
+                  [--uid UID] [--gid GID] [--recursive]
+                  [--alignment ALIGNMENT] [--deoptimize] (-m FILE | -c FILE)
+                  (-d | -z | -x | -a FILENAME | -r)
+
+MFS and CFG file manipulation utility.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -o FILE, --output FILE
+                        Output file to write
+  -i ID, --file-id ID   ID of the file to manipulate in the MFS file
+  -f PATH, --file-path PATH
+                        Path of the file to manipulate in the CFG file
+  --mode MODE           Mode for file being added to CFG
+  --opt OPT             Deplyoment option for file being added to CFG
+  --uid UID             User ID for file being added to CFG
+  --gid GID             Group ID for file being added to CFG
+  --recursive           Recursive deletion for a file path in CFG
+  --alignment ALIGNMENT
+                        Alignment type for CFG files. (default: 0). 0 :
+                        packed. 1 : align all files on chunk start. 2 : align
+                        end of files on end of chunk.
+  --deoptimize          De-optimize chain sequences when adding a file to MFS.
+  -m FILE, --mfs FILE   MFS file to read from
+  -c FILE, --cfg FILE   CFG file to read from
+  -d, --dump            Dump information about the MFS file, or the CFG file
+  -z, --zip             Store the MFS contents to a ZIP file
+  -x, --extract         Extract a file from the MFS file, or a file from the
+                        CFG file
+  -a FILENAME, --add FILENAME
+                        Add a file to the MFS file or a file to the CFG file
+  -r, --remove          Remove a file from the MFS file, or a file from the
+                        CFG file
+
+The default output is to stdout.
+Either one of --mfs or --cfg must be specified to indicate on which type of file to work (MFS or CFG).
+You can specify one of the mutually exclusive actions : --dump --zip, --extract, --add, --remove.
+For the --extract, --add, --remove actions, if --mfs is specified, then --file-id is required, if --cfg is specified, then --file-path is required.
+When adding a file to a CFG file, the --mode, --opt, --uid and --gid options can be added.
+The --mode option needs to be a string in the form 'dAEIrwxrwxrwx' where unused bits can be either a space or a dash, like --mode '    rwx---rwx' for example.
+The --opt option needs to be a string in the form '?!MF' where unused bits can be either a space or a dash.
+When adding a directory, both the file path needs to end with a '/' character and the --mode needs to start with 'd'.
+```
+
+## Attribution
+
+This tool was written by Youness Alaoui (KaKaRoTo) but inspired by the [parseMFS](https://github.com/ptresearch/parseMFS) tool by Dmitry Sklyarov from Positive Technologies,
+with small parts (CRC algorithm) copied as is.
+
+## License
+
+This software is released under the MIT license.

examples/exploit_home_bup_ct.sh

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+#!/bin/sh
+
+FILENAME=$1
+OUTPUT=$2
+MFS_START=0xa8000
+MFS_SIZE=0x64000
+
+if [[ "$FILENAME" == "" || "$OUTPUT" == "" ]] ; then
+	echo "Usage: $0 input.rom output.rom"
+	echo "ct filename must be 'ct'"
+	exit
+fi
+
+# Extract the MFS partition from the ME image
+ifdtool  -x $FILENAME
+dd if=flashregion_2_intel_me.bin of=MFS.part bs=1 skip=$(($MFS_START)) count=$(($MFS_SIZE))
+
+# Extract file number 7 (fitc.cfg)
+../MFSUtil.py -m MFS.part -x -i 7 -o 7.cfg
+
+# Remove the /home/bup/ct file from it
+../MFSUtil.py -c 7.cfg -r -f /home/bup/ct -o 7.cfg.noct
+rm 7.cfg
+
+# Add the new ct file as /home/bup/ct
+../MFSUtil.py -c 7.cfg.noct --add ct --alignment 2 --mode ' ---rwxr-----' --opt '?--F' --uid 3 --gid 351 -f /home/bup/ct -o fitc.cfg
+rm 7.cfg.noct
+
+# Delete file id 8 (home) from the MFS partition
+../MFSUtil.py -m MFS.part -r -i 8 -o MFS.no8
+rm MFS.part
+
+# Delete file id 7 (fitc.cfg) from the MFS partition
+../MFSUtil.py -m MFS.no8 -r -i 7 -o MFS.no7
+rm MFS.no8
+
+# Add the modified fitc.cfg into the MFS partition
+../MFSUtil.py -m MFS.no7 -a fitc.cfg --deoptimize -i 7 -o MFS.new
+rm fitc.cfg MFS.no7
+
+# Recreate the the ME image
+dd if=flashregion_2_intel_me.bin of=me_before_mfs.bin bs=1 count=$(($MFS_START))
+dd if=flashregion_2_intel_me.bin of=me_after_mfs.bin bs=1 skip=$(($MFS_START + $MFS_SIZE))
+rm flashregion_*.bin
+cat me_before_mfs.bin MFS.new me_after_mfs.bin > me_with_bup_ct.bin
+rm me_before_mfs.bin MFS.new me_after_mfs.bin
+
+# Recreate the BIOS firmware
+ifdtool -i ME:me_with_bup_ct.bin $FILENAME
+rm me_with_bup_ct.bin
+mv $FILENAME.new $OUTPUT
+
+# Enable DCI and HAP bits
+python -c "print('Enabling DCI and HAP in PCH Strap 0')
+with open('$OUTPUT', 'r+b') as f:
+    f.seek(0x102, 0)
+    f.write(chr(0x03))
+"

examples/extract_mfs.sh

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+#!/bin/sh
+
+FILENAME=$1
+MFS_START=0xa8000
+MFS_SIZE=0x64000
+
+ifdtool  -x $FILENAME
+
+dd if=flashregion_2_intel_me.bin of=MFS.part bs=1 skip=$(($MFS_START)) count=$(($MFS_SIZE))
+../MFSUtil.py -m MFS.part -x -i 7 -o 7.cfg
+../MFSUtil.py -m MFS.part -x -i 6 -o 6.cfg
+../MFSUtil.py -m MFS.part -d > MFS.dump
+