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add util/me_cleaner from me_cleaner-1.2 release archive

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Martin Kepplinger 6 years ago
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# me\_cleaner [![Donation](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=B5HCXCLZVCVZ8)
_me\_cleaner_ is a Python script able to modify an Intel ME firmware image with
the final purpose of reducing its ability to interact with the system.
## Intel ME
Intel ME is a co-processor integrated in all post-2006 Intel boards, which is
the base hardware for many Intel features like Intel AMT, Intel Boot Guard,
Intel PAVP and many others. To provide such features, it requires full access to
the system, including memory (through DMA) and network access (transparent to
the user).
Unlike many other firmware components, the Intel ME firmware can't be neither
disabled nor reimplemented, as it is tightly integrated in the boot process and
it is signed.
This poses an issue both to the free firmware implementations like [coreboot](
https://www.coreboot.org/), which are forced to rely on a proprietary, obscure
and always-on blob, and to the privacy-aware users, who are reasonably worried
about such firmware, running on the lowest privilege ring on x86.
## What can be done
Before Nehalem (ME version 6, 2008/2009) the ME firmware could be removed
completely from the flash chip by setting a couple of bits inside the flash
descriptor, effectively disabling it.
Starting from Nehalem the Intel ME firmware can't be removed anymore: without a
valid firmware the PC shuts off forcefully after 30 minutes, probably as an
attempt to enforce the Intel Anti-Theft policies.
However, while Intel ME can't be turned off completely, it is still possible to
modify its firmware up to a point where Intel ME is active only during the boot
process, effectively disabling it during the normal operation, which is what
_me\_cleaner_ tries to accomplish.
## Platform support
_me\_cleaner_ currently works on [most of the Intel platforms](
https://github.com/corna/me_cleaner/wiki/me_cleaner-status); while this doesn't
mean it works on all the boards (due to the different firmware implementations),
it has been proven quite reliable on a great number of them.
## Usage
_me\_cleaner_ should handle all the steps necessary to the modification of an
Intel ME firmware with the command:
$ python me_cleaner.py -S -O modified_image.bin original_dump.bin
However, obtaining the original firmware and flashing back the modified one is
usually not trivial, as the Intel ME firmware region is often non-writable from
the OS (and it's not a safe option anyways), requiring the use of an external
SPI programmer.
## Results
For pre-Skylake firmware (ME version < 11) this tool removes almost everything,
leaving only the two fundamental modules needed for the correct boot, `ROMP` and
`BUP`. The code size is reduced from 1.5 MB (non-AMT firmware) or 5 MB (AMT
firmware) to ~90 kB of compressed code.
Starting from Skylake (ME version >= 11) the ME subsystem and the firmware
structure have changed, requiring substantial changes in _me\_cleaner_.
The fundamental modules required for the correct boot are now four (`rbe`,
`kernel`, `syslib` and `bup`) and the minimum code size is ~300 kB of compressed
code (from the 2 MB of the non-AMT firmware and the 7 MB of the AMT one).
On some boards the OEM firmware fails to boot without a valid Intel ME firmware;
in the other cases the system should work with minor inconveniences (like longer
boot times or warning messages) or without issues at all.
Obviously, the features provided by Intel ME won't be functional anymore after
the modifications.
## Documentation
The detailed documentation about the working of _me\_cleaner_ can be found on
the page ["How does it work?" page](
https://github.com/corna/me_cleaner/wiki/How-does-it-work%3F).
Various guides and tutorials are available on the Internet, however a good
starting point is the ["How to apply me_cleaner" guide](
https://github.com/corna/me_cleaner/wiki/How-to-apply-me_cleaner).

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.TH me_cleaner 1 "MARCH 2018"
.SH me_cleaner
.PP
me_cleaner \- Tool for partial deblobbing of Intel ME/TXE firmware images
.SH SYNOPSIS
.PP
\fB\fCme_cleaner.py\fR [\-h] [\-v] [\-O output_file] [\-S | \-s] [\-r] [\-k]
[\-w whitelist | \-b blacklist] [\-d] [\-t] [\-c] [\-D output_descriptor]
[\-M output_me_image] \fIfile\fP
.SH DESCRIPTION
.PP
\fB\fCme_cleaner\fR is a tool able to disable parts of Intel ME/TXE by:
.RS
.IP \(bu 2
removing most of the code from its firmware
.IP \(bu 2
setting a special bit to force it to disable itself after the hardware
initialization
.RE
.PP
Using both the modes seems to be the most reliable way on many platforms.
.PP
The resulting modified firmware needs to be flashed (in most of the cases) with
an external programmer, often a dedicated SPI programmer or a Linux board with
a SPI master interface.
.PP
\fB\fCme_cleaner\fR works at least from Nehalem to Coffee Lake (for Intel ME) and on
Braswell/Cherry Trail (for Intel TXE), but may work as well on newer or
different architectures.
.PP
While \fB\fCme_cleaner\fR have been tested on a great number of platforms, fiddling
with the Intel ME/TXE firmware is \fIvery dangerous\fP and can easily lead to a
dead PC.
.PP
\fIYOU HAVE BEEN WARNED.\fP
.SH POSITIONAL ARGUMENTS
.TP
\fB\fCfile\fR
ME/TXE image or full dump.
.SH OPTIONAL ARGUMENTS
.TP
\fB\fC\-h\fR, \fB\fC\-\-help\fR
Show the help message and exit.
.TP
\fB\fC\-v\fR, \fB\fC\-\-version\fR
Show program's version number and exit.
.TP
\fB\fC\-O\fR, \fB\fC\-\-output\fR
Save the modified image in a separate file, instead of modifying the
original file.
.TP
\fB\fC\-S\fR, \fB\fC\-\-soft\-disable\fR
In addition to the usual operations on the ME/TXE firmware, set the
MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
the hardware initialization (requires a full dump).
.TP
\fB\fC\-s\fR, \fB\fC\-\-soft\-disable\-only\fR
Instead of the usual operations on the ME/TXE firmware, just set the
MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
the hardware initialization (requires a full dump).
.TP
\fB\fC\-r\fR, \fB\fC\-\-relocate\fR
Relocate the FTPR partition to the top of the ME region to save even more
space.
.TP
\fB\fC\-t\fR, \fB\fC\-\-truncate\fR
Truncate the empty part of the firmware (requires a separated ME/TXE image or
\fB\fC\-\-extract\-me\fR).
.TP
\fB\fC\-k\fR, \fB\fC\-\-keep\-modules\fR
Don't remove the FTPR modules, even when possible.
.TP
\fB\fC\-w\fR, \fB\fC\-\-whitelist\fR
Comma separated list of additional partitions to keep in the final image.
This can be used to specify the MFS partition for example, which stores PCIe
and clock settings.
.TP
\fB\fC\-b\fR, \fB\fC\-\-blacklist\fR
Comma separated list of partitions to remove from the image. This option
overrides the default removal list.
.TP
\fB\fC\-d\fR, \fB\fC\-\-descriptor\fR
Remove the ME/TXE Read/Write permissions to the other regions on the flash
from the Intel Flash Descriptor (requires a full dump).
.TP
\fB\fC\-D\fR, \fB\fC\-\-extract\-descriptor\fR
Extract the flash descriptor from a full dump; when used with \fB\fC\-\-truncate\fR
save a descriptor with adjusted regions start and end.
.TP
\fB\fC\-M\fR, \fB\fC\-\-extract\-me\fR
Extract the ME firmware from a full dump; when used with \fB\fC\-\-truncate\fR save a
truncated ME/TXE image.
.TP
\fB\fC\-c\fR, \fB\fC\-\-check\fR
Verify the integrity of the fundamental parts of the firmware and exit.
.SH SUPPORTED PLATFORMS
.PP
Currently \fB\fCme_cleaner\fR has been tested on the following platforms:
.TS
allbox;
cb cb cb cb
c c c c
c c c c
c c c c
c c c c
c c c c
c c c c
c c c c
c c c c
.
PCH CPU ME SKU
Ibex Peak * Nehalem/Westmere 6.0 Ignition
Ibex Peak * Nehalem/Westmere 6.x 1.5/5 MB
Cougar Point Sandy Bridge 7.x 1.5/5 MB
Panther Point Ivy Bridge 8.x 1.5/5 MB
Lynx/Wildcat Point Haswell/Broadwell 9.x 1.5/5 MB
Wildcat Point LP Broadwell Mobile 10.0 1.5/5 MB
Sunrise Point Skylake/Kabylake 11.x CON/COR
Union Point Kabylake 11.x CON/COR
.TE
.TS
allbox;
cb cb cb
c c c
.
SoC TXE SKU
Braswell/Cherry Trail 2.x 1.375 MB
.TE
.PP
* Not working on coreboot
.PP
All the reports are available on the project's GitHub page \[la]https://github.com/corna/me_cleaner/issues/3\[ra]\&.
.SH EXAMPLES
.PP
Check whether the provided image has a valid structure and signature:
.IP
\fB\fCme_cleaner.py \-c dumped_firmware.bin\fR
.PP
Remove most of the Intel ME firmware modules but don't set the HAP/AltMeDisable
bit:
.IP
\fB\fCme_cleaner.py \-S \-O modified_me_firmware.bin dumped_firmware.bin\fR
.PP
Remove most of the Intel ME firmware modules and set the HAP/AltMeDisable bit,
disable the Read/Write access of Intel ME to the other flash region, then
relocate the code to the top of the image and truncate it, extracting a modified
descriptor and ME image:
.IP
\fB\fCme_cleaner.py \-S \-r \-t \-d \-D ifd_shrinked.bin \-M me_shrinked.bin \-O modified_firmware.bin full_dumped_firmware.bin\fR
.SH BUGS
.PP
Bugs should be reported on the project's GitHub page \[la]https://github.com/corna/me_cleaner\[ra]\&.
.SH AUTHOR
.PP
Nicola Corna \[la]nicola@corna.info\[ra]
.SH SEE ALSO
.PP
.BR flashrom (8),
me_cleaner's Wiki \[la]https://github.com/corna/me_cleaner/wiki\[ra]

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[//]: # (Use md2man to generate the man page from this Markdown)
[//]: # (https://github.com/sunaku/md2man)
me_cleaner 1 "MARCH 2018"
=======================================
me\_cleaner
----
me\_cleaner - Tool for partial deblobbing of Intel ME/TXE firmware images
SYNOPSIS
--------
`me_cleaner.py` [-h] [-v] [-O output\_file] [-S | -s] [-r] [-k]
[-w whitelist | -b blacklist] [-d] [-t] [-c] [-D output\_descriptor]
[-M output\_me\_image] *file*
DESCRIPTION
-----------
`me_cleaner` is a tool able to disable parts of Intel ME/TXE by:
* removing most of the code from its firmware
* setting a special bit to force it to disable itself after the hardware
initialization
Using both the modes seems to be the most reliable way on many platforms.
The resulting modified firmware needs to be flashed (in most of the cases) with
an external programmer, often a dedicated SPI programmer or a Linux board with
a SPI master interface.
`me_cleaner` works at least from Nehalem to Coffee Lake (for Intel ME) and on
Braswell/Cherry Trail (for Intel TXE), but may work as well on newer or
different architectures.
While `me_cleaner` have been tested on a great number of platforms, fiddling
with the Intel ME/TXE firmware is *very dangerous* and can easily lead to a
dead PC.
*YOU HAVE BEEN WARNED.*
POSITIONAL ARGUMENTS
--------------------
`file`
ME/TXE image or full dump.
OPTIONAL ARGUMENTS
------------------
`-h`, `--help`
Show the help message and exit.
`-v`, `--version`
Show program's version number and exit.
`-O`, `--output`
Save the modified image in a separate file, instead of modifying the
original file.
`-S`, `--soft-disable`
In addition to the usual operations on the ME/TXE firmware, set the
MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
the hardware initialization (requires a full dump).
`-s`, `--soft-disable-only`
Instead of the usual operations on the ME/TXE firmware, just set the
MeAltDisable bit or the HAP bit to ask Intel ME/TXE to disable itself after
the hardware initialization (requires a full dump).
`-r`, `--relocate`
Relocate the FTPR partition to the top of the ME region to save even more
space.
`-t`, `--truncate`
Truncate the empty part of the firmware (requires a separated ME/TXE image or
`--extract-me`).
`-k`, `--keep-modules`
Don't remove the FTPR modules, even when possible.
`-w`, `--whitelist`
Comma separated list of additional partitions to keep in the final image.
This can be used to specify the MFS partition for example, which stores PCIe
and clock settings.
`-b`, `--blacklist`
Comma separated list of partitions to remove from the image. This option
overrides the default removal list.
`-d`, `--descriptor`
Remove the ME/TXE Read/Write permissions to the other regions on the flash
from the Intel Flash Descriptor (requires a full dump).
`-D`, `--extract-descriptor`
Extract the flash descriptor from a full dump; when used with `--truncate`
save a descriptor with adjusted regions start and end.
`-M`, `--extract-me`
Extract the ME firmware from a full dump; when used with `--truncate` save a
truncated ME/TXE image.
`-c`, `--check`
Verify the integrity of the fundamental parts of the firmware and exit.
SUPPORTED PLATFORMS
-------------------
Currently `me_cleaner` has been tested on the following platforms:
| PCH | CPU | ME | SKU |
|:-----------------:|:-----------------:|:----:|:--------:|
| Ibex Peak * | Nehalem/Westmere | 6.0 | Ignition |
| Ibex Peak * | Nehalem/Westmere | 6.x | 1.5/5 MB |
| Cougar Point | Sandy Bridge | 7.x | 1.5/5 MB |
| Panther Point | Ivy Bridge | 8.x | 1.5/5 MB |
| Lynx/Wildcat Point| Haswell/Broadwell | 9.x | 1.5/5 MB |
| Wildcat Point LP | Broadwell Mobile | 10.0 | 1.5/5 MB |
| Sunrise Point | Skylake/Kabylake | 11.x | CON/COR |
| Union Point | Kabylake | 11.x | CON/COR |
| SoC | TXE | SKU |
|:---------------------:|:---:|:--------:|
| Braswell/Cherry Trail | 2.x | 1.375 MB |
\* Not working on coreboot
All the reports are available on the [project's GitHub page](
https://github.com/corna/me_cleaner/issues/3).
EXAMPLES
--------
Check whether the provided image has a valid structure and signature:
`me_cleaner.py -c dumped_firmware.bin`
Remove most of the Intel ME firmware modules but don't set the HAP/AltMeDisable
bit:
`me_cleaner.py -S -O modified_me_firmware.bin dumped_firmware.bin`
Remove most of the Intel ME firmware modules and set the HAP/AltMeDisable bit,
disable the Read/Write access of Intel ME to the other flash region, then
relocate the code to the top of the image and truncate it, extracting a modified
descriptor and ME image:
`me_cleaner.py -S -r -t -d -D ifd_shrinked.bin -M me_shrinked.bin -O modified_firmware.bin full_dumped_firmware.bin`
BUGS
----
Bugs should be reported on the [project's GitHub page](
https://github.com/corna/me_cleaner).
AUTHOR
------
Nicola Corna <nicola@corna.info>
SEE ALSO
--------
flashrom(8), [me\_cleaner's Wiki](https://github.com/corna/me_cleaner/wiki)

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#!/usr/bin/python
# me_cleaner - Tool for partial deblobbing of Intel ME/TXE firmware images
# Copyright (C) 2016-2018 Nicola Corna <nicola@corna.info>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
from __future__ import division, print_function
import argparse
import binascii
import hashlib
import itertools
import shutil
import sys
from struct import pack, unpack
min_ftpr_offset = 0x400
spared_blocks = 4
unremovable_modules = ("ROMP", "BUP")
unremovable_modules_me11 = ("rbe", "kernel", "syslib", "bup")
unremovable_partitions = ("FTPR",)
pubkeys_md5 = {
"763e59ebe235e45a197a5b1a378dfa04": ("ME", ("6.x.x.x",)),
"3a98c847d609c253e145bd36512629cb": ("ME", ("6.0.50.x",)),
"0903fc25b0f6bed8c4ed724aca02124c": ("ME", ("7.x.x.x", "8.x.x.x")),
"2011ae6df87c40fba09e3f20459b1ce0": ("ME", ("9.0.x.x", "9.1.x.x")),
"e8427c5691cf8b56bc5cdd82746957ed": ("ME", ("9.5.x.x", "10.x.x.x")),
"986a78e481f185f7d54e4af06eb413f6": ("ME", ("11.x.x.x",)),
"bda0b6bb8ca0bf0cac55ac4c4d55e0f2": ("TXE", ("1.x.x.x",)),
"b726a2ab9cd59d4e62fe2bead7cf6997": ("TXE", ("1.x.x.x",)),
"0633d7f951a3e7968ae7460861be9cfb": ("TXE", ("2.x.x.x",)),
"1d0a36e9f5881540d8e4b382c6612ed8": ("TXE", ("3.x.x.x",)),
"be900fef868f770d266b1fc67e887e69": ("SPS", ("2.x.x.x",)),
"4622e3f2cb212a89c90a4de3336d88d2": ("SPS", ("3.x.x.x",)),
"31ef3d950eac99d18e187375c0764ca4": ("SPS", ("4.x.x.x",))
}
class OutOfRegionException(Exception):
pass
class RegionFile:
def __init__(self, f, region_start, region_end):
self.f = f
self.region_start = region_start
self.region_end = region_end
def read(self, n):
if f.tell() + n <= self.region_end:
return self.f.read(n)
else:
raise OutOfRegionException()
def readinto(self, b):
if f.tell() + len(b) <= self.region_end:
return self.f.readinto(b)
else:
raise OutOfRegionException()
def seek(self, offset):
if self.region_start + offset <= self.region_end:
return self.f.seek(self.region_start + offset)
else:
raise OutOfRegionException()
def write_to(self, offset, data):
if self.region_start + offset + len(data) <= self.region_end:
self.f.seek(self.region_start + offset)
return self.f.write(data)
else:
raise OutOfRegionException()
def fill_range(self, start, end, fill):
if self.region_start + end <= self.region_end:
if start < end:
block = fill * 4096
self.f.seek(self.region_start + start)
self.f.writelines(itertools.repeat(block,
(end - start) // 4096))
self.f.write(block[:(end - start) % 4096])
else:
raise OutOfRegionException()
def fill_all(self, fill):
self.fill_range(0, self.region_end - self.region_start, fill)
def move_range(self, offset_from, size, offset_to, fill):
if self.region_start + offset_from + size <= self.region_end and \
self.region_start + offset_to + size <= self.region_end:
for i in range(0, size, 4096):
self.f.seek(self.region_start + offset_from + i, 0)
block = self.f.read(min(size - i, 4096))
self.f.seek(self.region_start + offset_from + i, 0)
self.f.write(fill * len(block))
self.f.seek(self.region_start + offset_to + i, 0)
self.f.write(block)
else:
raise OutOfRegionException()
def save(self, filename, size):
if self.region_start + size <= self.region_end:
self.f.seek(self.region_start)
copyf = open(filename, "w+b")
for i in range(0, size, 4096):
copyf.write(self.f.read(min(size - i, 4096)))
return copyf
else:
raise OutOfRegionException()
def get_chunks_offsets(llut):
chunk_count = unpack("<I", llut[0x04:0x08])[0]
huffman_stream_end = sum(unpack("<II", llut[0x10:0x18]))
nonzero_offsets = [huffman_stream_end]
offsets = []
for i in range(0, chunk_count):
chunk = llut[0x40 + i * 4:0x44 + i * 4]
offset = 0
if chunk[3] != 0x80:
offset = unpack("<I", chunk[0:3] + b"\x00")[0]
offsets.append([offset, 0])
if offset != 0:
nonzero_offsets.append(offset)
nonzero_offsets.sort()
for i in offsets:
if i[0] != 0:
i[1] = nonzero_offsets[nonzero_offsets.index(i[0]) + 1]
return offsets
def remove_modules(f, mod_headers, ftpr_offset, me_end):
comp_str = ("uncomp.", "Huffman", "LZMA")
unremovable_huff_chunks = []
chunks_offsets = []
base = 0
chunk_size = 0
end_addr = 0
for mod_header in mod_headers:
name = mod_header[0x04:0x14].rstrip(b"\x00").decode("ascii")
offset = unpack("<I", mod_header[0x38:0x3C])[0] + ftpr_offset
size = unpack("<I", mod_header[0x40:0x44])[0]
flags = unpack("<I", mod_header[0x50:0x54])[0]
comp_type = (flags >> 4) & 7
print(" {:<16} ({:<7}, ".format(name, comp_str[comp_type]), end="")
if comp_type == 0x00 or comp_type == 0x02:
print("0x{:06x} - 0x{:06x} ): "
.format(offset, offset + size), end="")
if name in unremovable_modules:
end_addr = max(end_addr, offset + size)
print("NOT removed, essential")
else:
end = min(offset + size, me_end)
f.fill_range(offset, end, b"\xff")
print("removed")
elif comp_type == 0x01:
if not chunks_offsets:
f.seek(offset)
llut = f.read(4)
if llut == b"LLUT":
llut += f.read(0x3c)
chunk_count = unpack("<I", llut[0x4:0x8])[0]
base = unpack("<I", llut[0x8:0xc])[0] + 0x10000000
chunk_size = unpack("<I", llut[0x30:0x34])[0]
llut += f.read(chunk_count * 4)
chunks_offsets = get_chunks_offsets(llut)
else:
sys.exit("Huffman modules found, but LLUT is not present")
module_base = unpack("<I", mod_header[0x34:0x38])[0]
module_size = unpack("<I", mod_header[0x3c:0x40])[0]
first_chunk_num = (module_base - base) // chunk_size
last_chunk_num = first_chunk_num + module_size // chunk_size
huff_size = 0
for chunk in chunks_offsets[first_chunk_num:last_chunk_num + 1]:
huff_size += chunk[1] - chunk[0]
print("fragmented data, {:<9}): "
.format("~" + str(int(round(huff_size / 1024))) + " KiB"),
end="")
if name in unremovable_modules:
print("NOT removed, essential")
unremovable_huff_chunks += \
[x for x in chunks_offsets[first_chunk_num:
last_chunk_num + 1] if x[0] != 0]
else:
print("removed")
else:
print("0x{:06x} - 0x{:06x}): unknown compression, skipping"
.format(offset, offset + size), end="")
if chunks_offsets:
removable_huff_chunks = []
for chunk in chunks_offsets:
if all(not(unremovable_chk[0] <= chunk[0] < unremovable_chk[1] or
unremovable_chk[0] < chunk[1] <= unremovable_chk[1])
for unremovable_chk in unremovable_huff_chunks):
removable_huff_chunks.append(chunk)
for removable_chunk in removable_huff_chunks:
if removable_chunk[1] > removable_chunk[0]:
end = min(removable_chunk[1], me_end)
f.fill_range(removable_chunk[0], end, b"\xff")
end_addr = max(end_addr,
max(unremovable_huff_chunks, key=lambda x: x[1])[1])
return end_addr
def check_partition_signature(f, offset):
f.seek(offset)
header = f.read(0x80)
modulus = int(binascii.hexlify(f.read(0x100)[::-1]), 16)
public_exponent = unpack("<I", f.read(4))[0]
signature = int(binascii.hexlify(f.read(0x100)[::-1]), 16)
header_len = unpack("<I", header[0x4:0x8])[0] * 4
manifest_len = unpack("<I", header[0x18:0x1c])[0] * 4
f.seek(offset + header_len)
sha256 = hashlib.sha256()
sha256.update(header)
sha256.update(f.read(manifest_len - header_len))
decrypted_sig = pow(signature, public_exponent, modulus)
return "{:#x}".format(decrypted_sig).endswith(sha256.hexdigest()) # FIXME
def print_check_partition_signature(f, offset):
if check_partition_signature(f, offset):
print("VALID")
else:
print("INVALID!!")
sys.exit("The FTPR partition signature is not valid. Is the input "
"ME/TXE image valid?")
def relocate_partition(f, me_end, partition_header_offset,
new_offset, mod_headers):
f.seek(partition_header_offset)
name = f.read(4).rstrip(b"\x00").decode("ascii")
f.seek(partition_header_offset + 0x8)
old_offset, partition_size = unpack("<II", f.read(0x8))
llut_start = 0
for mod_header in mod_headers:
if (unpack("<I", mod_header[0x50:0x54])[0] >> 4) & 7 == 0x01:
llut_start = unpack("<I", mod_header[0x38:0x3C])[0] + old_offset
break
if mod_headers and llut_start != 0:
# Bytes 0x9:0xb of the LLUT (bytes 0x1:0x3 of the AddrBase) are added
# to the SpiBase (bytes 0xc:0x10 of the LLUT) to compute the final
# start of the LLUT. Since AddrBase is not modifiable, we can act only
# on SpiBase and here we compute the minimum allowed new_offset.
f.seek(llut_start + 0x9)
lut_start_corr = unpack("<H", f.read(2))[0]
new_offset = max(new_offset,
lut_start_corr - llut_start - 0x40 + old_offset)
new_offset = ((new_offset + 0x1f) // 0x20) * 0x20
offset_diff = new_offset - old_offset
print("Relocating {} from {:#x} - {:#x} to {:#x} - {:#x}..."
.format(name, old_offset, old_offset + partition_size,
new_offset, new_offset + partition_size))
print(" Adjusting FPT entry...")
f.write_to(partition_header_offset + 0x8,
pack("<I", new_offset))
if mod_headers:
if llut_start != 0:
f.seek(llut_start)
if f.read(4) == b"LLUT":
print(" Adjusting LUT start offset...")
lut_offset = llut_start + offset_diff + 0x40 - lut_start_corr
f.write_to(llut_start + 0x0c, pack("<I", lut_offset))
print(" Adjusting Huffman start offset...")
f.seek(llut_start + 0x14)
old_huff_offset = unpack("<I", f.read(4))[0]
f.write_to(llut_start + 0x14,
pack("<I", old_huff_offset + offset_diff))
print(" Adjusting chunks offsets...")
f.seek(llut_start + 0x4)
chunk_count = unpack("<I", f.read(4))[0]
f.seek(llut_start + 0x40)
chunks = bytearray(chunk_count * 4)
f.readinto(chunks)
for i in range(0, chunk_count * 4, 4):
if chunks[i + 3] != 0x80:
chunks[i:i + 3] = \
pack("<I", unpack("<I", chunks[i:i + 3] +
b"\x00")[0] + offset_diff)[0:3]
f.write_to(llut_start + 0x40, chunks)
else:
sys.exit("Huffman modules present but no LLUT found!")
else:
print(" No Huffman modules found")
print(" Moving data...")
partition_size = min(partition_size, me_end - old_offset)
f.move_range(old_offset, partition_size, new_offset, b"\xff")
return new_offset
def check_and_remove_modules(f, me_end, offset, min_offset,
relocate, keep_modules):
f.seek(offset + 0x20)
num_modules = unpack("<I", f.read(4))[0]
f.seek(offset + 0x290)
data = f.read(0x84)
mod_header_size = 0
if data[0x0:0x4] == b"$MME":
if data[0x60:0x64] == b"$MME" or num_modules == 1:
mod_header_size = 0x60
elif data[0x80:0x84] == b"$MME":
mod_header_size = 0x80
if mod_header_size != 0:
f.seek(offset + 0x290)
data = f.read(mod_header_size * num_modules)
mod_headers = [data[i * mod_header_size:(i + 1) * mod_header_size]
for i in range(0, num_modules)]
if all(hdr.startswith(b"$MME") for hdr in mod_headers):
if args.keep_modules:
end_addr = offset + ftpr_length
else:
end_addr = remove_modules(f, mod_headers, offset, me_end)
if args.relocate:
new_offset = relocate_partition(f, me_end, 0x30, min_offset,
mod_headers)
end_addr += new_offset - offset
offset = new_offset
return end_addr, offset
else:
print("Found less modules than expected in the FTPR "
"partition; skipping modules removal")
else:
print("Can't find the module header size; skipping "
"modules removal")
return -1, offset
def check_and_remove_modules_me11(f, me_end, partition_offset,
partition_length, min_offset, relocate,
keep_modules):
comp_str = ("LZMA/uncomp.", "Huffman")
if keep_modules:
end_data = partition_offset + partition_length
else:
end_data = 0
f.seek(partition_offset + 0x4)
module_count = unpack("<I", f.read(4))[0]
modules = []
modules.append(("end", partition_length, 0))
f.seek(partition_offset + 0x10)
for i in range(0, module_count):
data = f.read(0x18)
name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
offset_block = unpack("<I", data[0xc:0x10])[0]
offset = offset_block & 0x01ffffff
comp_type = (offset_block & 0x02000000) >> 25
modules.append((name, offset, comp_type))
modules.sort(key=lambda x: x[1])
for i in range(0, module_count):
name = modules[i][0]
offset = partition_offset + modules[i][1]
end = partition_offset + modules[i + 1][1]
removed = False
if name.endswith(".man") or name.endswith(".met"):
compression = "uncompressed"
else:
compression = comp_str[modules[i][2]]
print(" {:<12} ({:<12}, 0x{:06x} - 0x{:06x}): "
.format(name, compression, offset, end), end="")
if name.endswith(".man"):
print("NOT removed, partition manif.")
elif name.endswith(".met"):
print("NOT removed, module metadata")
elif any(name.startswith(m) for m in unremovable_modules_me11):
print("NOT removed, essential")
else:
removed = True
f.fill_range(offset, min(end, me_end), b"\xff")
print("removed")
if not removed:
end_data = max(end_data, end)
if relocate:
new_offset = relocate_partition(f, me_end, 0x30, min_offset, [])
end_data += new_offset - partition_offset
partition_offset = new_offset
return end_data, partition_offset
def check_mn2_tag(f, offset):
f.seek(offset + 0x1c)
tag = f.read(4)
if tag != b"$MN2":
sys.exit("Wrong FTPR manifest tag ({}), this image may be corrupted"
.format(tag))
def flreg_to_start_end(flreg):
return (flreg & 0x7fff) << 12, (flreg >> 4 & 0x7fff000 | 0xfff) + 1
def start_end_to_flreg(start, end):
return (start & 0x7fff000) >> 12 | ((end - 1) & 0x7fff000) << 4
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Tool to remove as much code "
"as possible from Intel ME/TXE firmware "
"images")
softdis = parser.add_mutually_exclusive_group()
bw_list = parser.add_mutually_exclusive_group()
parser.add_argument("-v", "--version", action="version",
version="%(prog)s 1.2")
parser.add_argument("file", help="ME/TXE image or full dump")
parser.add_argument("-O", "--output", metavar='output_file', help="save "
"the modified image in a separate file, instead of "
"modifying the original file")
softdis.add_argument("-S", "--soft-disable", help="in addition to the "
"usual operations on the ME/TXE firmware, set the "
"MeAltDisable bit or the HAP bit to ask Intel ME/TXE "
"to disable itself after the hardware initialization "
"(requires a full dump)", action="store_true")
softdis.add_argument("-s", "--soft-disable-only", help="instead of the "
"usual operations on the ME/TXE firmware, just set "
"the MeAltDisable bit or the HAP bit to ask Intel "
"ME/TXE to disable itself after the hardware "
"initialization (requires a full dump)",
action="store_true")
parser.add_argument("-r", "--relocate", help="relocate the FTPR partition "
"to the top of the ME region to save even more space",
action="store_true")
parser.add_argument("-t", "--truncate", help="truncate the empty part of "
"the firmware (requires a separated ME/TXE image or "
"--extract-me)", action="store_true")
parser.add_argument("-k", "--keep-modules", help="don't remove the FTPR "
"modules, even when possible", action="store_true")
bw_list.add_argument("-w", "--whitelist", metavar="whitelist",
help="Comma separated list of additional partitions "
"to keep in the final image. This can be used to "
"specify the MFS partition for example, which stores "
"PCIe and clock settings.")
bw_list.add_argument("-b", "--blacklist", metavar="blacklist",
help="Comma separated list of partitions to remove "
"from the image. This option overrides the default "
"removal list.")
parser.add_argument("-d", "--descriptor", help="remove the ME/TXE "
"Read/Write permissions to the other regions on the "
"flash from the Intel Flash Descriptor (requires a "
"full dump)", action="store_true")
parser.add_argument("-D", "--extract-descriptor",
metavar='output_descriptor', help="extract the flash "
"descriptor from a full dump; when used with "
"--truncate save a descriptor with adjusted regions "
"start and end")
parser.add_argument("-M", "--extract-me", metavar='output_me_image',
help="extract the ME firmware from a full dump; when "
"used with --truncate save a truncated ME/TXE image")
parser.add_argument("-c", "--check", help="verify the integrity of the "
"fundamental parts of the firmware and exit",
action="store_true")
args = parser.parse_args()
if args.check and (args.soft_disable_only or args.soft_disable or
args.relocate or args.descriptor or args.truncate or args.output):
sys.exit("-c can't be used with -S, -s, -r, -d, -t or -O")
if args.soft_disable_only and (args.relocate or args.truncate):
sys.exit("-s can't be used with -r or -t")
if (args.whitelist or args.blacklist) and args.relocate:
sys.exit("Relocation is not yet supported with custom whitelist or "
"blacklist")
f = open(args.file, "rb" if args.check or args.output else "r+b")
f.seek(0x10)
magic = f.read(4)
if magic == b"$FPT":
print("ME/TXE image detected")
if args.descriptor or args.extract_descriptor or args.extract_me or \
args.soft_disable or args.soft_disable_only:
sys.exit("-d, -D, -M, -S and -s require a full dump")
f.seek(0, 2)
me_start = 0
me_end = f.tell()
mef = RegionFile(f, me_start, me_end)
elif magic == b"\x5a\xa5\xf0\x0f":
print("Full image detected")
if args.truncate and not args.extract_me:
sys.exit("-t requires a separated ME/TXE image (or --extract-me)")
f.seek(0x14)
flmap0, flmap1 = unpack("<II", f.read(8))
frba = flmap0 >> 12 & 0xff0
fmba = (flmap1 & 0xff) << 4
fpsba = flmap1 >> 12 & 0xff0
f.seek(frba)
flreg = unpack("<III", f.read(12))
fd_start, fd_end = flreg_to_start_end(flreg[0])
bios_start, bios_end = flreg_to_start_end(flreg[1])
me_start, me_end = flreg_to_start_end(flreg[2])
if me_start >= me_end:
sys.exit("The ME/TXE region in this image has been disabled")
mef = RegionFile(f, me_start, me_end)
mef.seek(0x10)
if mef.read(4) != b"$FPT":
sys.exit("The ME/TXE region is corrupted or missing")
print("The ME/TXE region goes from {:#x} to {:#x}"
.format(me_start, me_end))
else:
sys.exit("Unknown image")
end_addr = me_end
print("Found FPT header at {:#x}".format(mef.region_start + 0x10))
mef.seek(0x14)
entries = unpack("<I", mef.read(4))[0]
print("Found {} partition(s)".format(entries))
mef.seek(0x30)
partitions = mef.read(entries * 0x20)
ftpr_header = b""
for i in range(entries):
if partitions[i * 0x20:(i * 0x20) + 4] == b"FTPR":
ftpr_header = partitions[i * 0x20:(i + 1) * 0x20]
break
if ftpr_header == b"":
sys.exit("FTPR header not found, this image doesn't seem to be valid")
ftpr_offset, ftpr_length = unpack("<II", ftpr_header[0x08:0x10])
print("Found FTPR header: FTPR partition spans from {:#x} to {:#x}"
.format(ftpr_offset, ftpr_offset + ftpr_length))
mef.seek(ftpr_offset)
if mef.read(4) == b"$CPD":
me11 = True
num_entries = unpack("<I", mef.read(4))[0]
mef.seek(ftpr_offset + 0x10)
ftpr_mn2_offset = -1
for i in range(0, num_entries):
data = mef.read(0x18)
name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
offset = unpack("<I", data[0xc:0xf] + b"\x00")[0]
if name == "FTPR.man":
ftpr_mn2_offset = offset
break
if ftpr_mn2_offset >= 0:
check_mn2_tag(mef, ftpr_offset + ftpr_mn2_offset)
print("Found FTPR manifest at {:#x}"
.format(ftpr_offset + ftpr_mn2_offset))
else:
sys.exit("Can't find the manifest of the FTPR partition")
else:
check_mn2_tag(mef, ftpr_offset)
me11 = False
ftpr_mn2_offset = 0
mef.seek(ftpr_offset + ftpr_mn2_offset + 0x24)
version = unpack("<HHHH", mef.read(0x08))
print("ME/TXE firmware version {}"
.format('.'.join(str(i) for i in version)))
mef.seek(ftpr_offset + ftpr_mn2_offset + 0x80)
pubkey_md5 = hashlib.md5(mef.read(0x104)).hexdigest()
if pubkey_md5 in pubkeys_md5:
variant, pubkey_versions = pubkeys_md5[pubkey_md5]
print("Public key match: Intel {}, firmware versions {}"
.format(variant, ", ".join(pubkey_versions)))
else:
if version[0] >= 6:
variant = "ME"
else:
variant = "TXE"
print("WARNING Unknown public key {}\n"
" Assuming Intel {}\n"
" Please report this warning to the project's maintainer!"
.format(pubkey_md5, variant))
if not args.check and args.output:
f.close()
shutil.copy(args.file, args.output)
f = open(args.output, "r+b")
mef = RegionFile(f, me_start, me_end)
if me_start > 0:
fdf = RegionFile(f, fd_start, fd_end)
if me11:
fdf.seek(fpsba)
pchstrp0 = unpack("<I", fdf.read(4))[0]
print("The HAP bit is " +
("SET" if pchstrp0 & 1 << 16 else "NOT SET"))
else:
fdf.seek(fpsba + 0x28)
pchstrp10 = unpack("<I", fdf.read(4))[0]
print("The AltMeDisable bit is " +
("SET" if pchstrp10 & 1 << 7 else "NOT SET"))
# ME 6 Ignition: wipe everything
me6_ignition = False
if not args.check and not args.soft_disable_only and \
variant == "ME" and version[0] == 6:
mef.seek(ftpr_offset + 0x20)
num_modules = unpack("<I", mef.read(4))[0]
mef.seek(ftpr_offset + 0x290 + (num_modules + 1) * 0x60)
data = mef.read(0xc)
if data[0x0:0x4] == b"$SKU" and data[0x8:0xc] == b"\x00\x00\x00\x00":
print("ME 6 Ignition firmware detected, removing everything...")
mef.fill_all(b"\xff")
me6_ignition = True
if not args.check:
if not args.soft_disable_only and not me6_ignition:
print("Reading partitions list...")
unremovable_part_fpt = b""
extra_part_end = 0
whitelist = []
blacklist = []
whitelist += unremovable_partitions
if args.blacklist:
blacklist = args.blacklist.split(",")
elif args.whitelist:
whitelist += args.whitelist.split(",")
for i in range(entries):
partition = partitions[i * 0x20:(i + 1) * 0x20]
flags = unpack("<I", partition[0x1c:0x20])[0]
try:
part_name = \
partition[0x0:0x4].rstrip(b"\x00").decode("ascii")
except UnicodeDecodeError:
part_name = "????"
part_start, part_length = unpack("<II", partition[0x08:0x10])
# ME 6: the last partition has 0xffffffff as size
if variant == "ME" and version[0] == 6 and \
i == entries - 1 and part_length == 0xffffffff:
part_length = me_end - me_start - part_start
part_end = part_start + part_length
if flags & 0x7f == 2:
print(" {:<4} ({:^24}, 0x{:08x} total bytes): nothing to "
"remove"
.format(part_name, "NVRAM partition, no data",
part_length))
elif part_start == 0 or part_length == 0 or part_end > me_end:
print(" {:<4} ({:^24}, 0x{:08x} total bytes): nothing to "
"remove"
.format(part_name, "no data here", part_length))
else:
print(" {:<4} (0x{:08x} - 0x{:09x}, 0x{:08x} total bytes): "
.format(part_name, part_start, part_end, part_length),
end="")
if part_name in whitelist or (blacklist and
part_name not in blacklist):
unremovable_part_fpt += partition
if part_name != "FTPR":
extra_part_end = max(extra_part_end, part_end)
print("NOT removed")
else:
mef.fill_range(part_start, part_end, b"\xff")
print("removed")
print("Removing partition entries in FPT...")
mef.write_to(0x30, unremovable_part_fpt)
mef.write_to(0x14,
pack("<I", len(unremovable_part_fpt) // 0x20))
mef.fill_range(0x30 + len(unremovable_part_fpt),
0x30 + len(partitions), b"\xff")
if (not blacklist and "EFFS" not in whitelist) or \
"EFFS" in blacklist:
print("Removing EFFS presence flag...")
mef.seek(0x24)
flags = unpack("<I", mef.read(4))[0]
flags &= ~(0x00000001)
mef.write_to(0x24, pack("<I", flags))
if me11:
mef.seek(0x10)
header = bytearray(mef.read(0x20))
header[0x0b] = 0x00
else:
mef.seek(0)
header = bytearray(mef.read(0x30))
header[0x1b] = 0x00
checksum = (0x100 - sum(header) & 0xff) & 0xff
print("Correcting checksum (0x{:02x})...".format(checksum))
# The checksum is just the two's complement of the sum of the first
# 0x30 bytes in ME < 11 or bytes 0x10:0x30 in ME >= 11 (except for
# 0x1b, the checksum itself). In other words, the sum of those
# bytes must be always 0x00.
mef.write_to(0x1b, pack("B", checksum))
print("Reading FTPR modules list...")
if me11:
end_addr, ftpr_offset = \
check_and_remove_modules_me11(mef, me_end,
ftpr_offset, ftpr_length,
min_ftpr_offset,
args.relocate,
args.keep_modules)
else:
end_addr, ftpr_offset = \
check_and_remove_modules(mef, me_end, ftpr_offset,
min_ftpr_offset, args.relocate,
args.keep_modules)
if end_addr > 0:
end_addr = max(end_addr, extra_part_end)
end_addr = (end_addr // 0x1000 + 1) * 0x1000
end_addr += spared_blocks * 0x1000
print("The ME minimum size should be {0} bytes "
"({0:#x} bytes)".format(end_addr))
if me_start > 0:
print("The ME region can be reduced up to:\n"
" {:08x}:{:08x} me"
.format(me_start, me_start + end_addr - 1))
elif args.truncate:
print("Truncating file at {:#x}...".format(end_addr))
f.truncate(end_addr)
if args.soft_disable or args.soft_disable_only:
if me11:
print("Setting the HAP bit in PCHSTRP0 to disable Intel ME...")
pchstrp0 |= (1 << 16)
fdf.write_to(fpsba, pack("<I", pchstrp0))
else:
print("Setting the AltMeDisable bit in PCHSTRP10 to disable "
"Intel ME...")
pchstrp10 |= (1 << 7)
fdf.write_to(fpsba + 0x28, pack("<I", pchstrp10))
if args.descriptor:
print("Removing ME/TXE R/W access to the other flash regions...")
if me11:
flmstr2 = 0x00400500
else:
fdf.seek(fmba + 0x4)
flmstr2 = (unpack("<I", fdf.read(4))[0] | 0x04040000) & 0x0404ffff
fdf.write_to(fmba + 0x4, pack("<I", flmstr2))
if args.extract_descriptor:
if args.truncate:
print("Extracting the descriptor to \"{}\"..."
.format(args.extract_descriptor))
fdf_copy = fdf.save(args.extract_descriptor, fd_end - fd_start)
if bios_start == me_end:
print("Modifying the regions of the extracted descriptor...")
print(" {:08x}:{:08x} me --> {:08x}:{:08x} me"
.format(me_start, me_end - 1,
me_start, me_start + end_addr - 1))
print(" {:08x}:{:08x} bios --> {:08x}:{:08x} bios"
.format(bios_start, bios_end - 1,
me_start + end_addr, bios_end - 1))
flreg1 = start_end_to_flreg(me_start + end_addr, bios_end)
flreg2 = start_end_to_flreg(me_start, me_start + end_addr)
fdf_copy.seek(frba + 0x4)
fdf_copy.write(pack("<II", flreg1, flreg2))
else:
print("\nWARNING:\n The start address of the BIOS region "
"isn't equal to the end address of the ME\n region: if "
"you want to recover the space from the ME region you "
"have to\n manually modify the descriptor.\n")
else:
print("Extracting the descriptor to \"{}\"..."
.format(args.extract_descriptor))
fdf_copy = fdf.save(args.extract_descriptor, fd_end - fd_start)
fdf_copy.close()
if args.extract_me:
if args.truncate:
print("Extracting and truncating the ME image to \"{}\"..."
.format(args.extract_me))
mef_copy = mef.save(args.extract_me, end_addr)
else:
print("Extracting the ME image to \"{}\"..."
.format(args.extract_me))
mef_copy = mef.save(args.extract_me, me_end - me_start)
if not me6_ignition:
print("Checking the FTPR RSA signature of the extracted ME "
"image... ", end="")
print_check_partition_signature(mef_copy,
ftpr_offset + ftpr_mn2_offset)
mef_copy.close()
if not me6_ignition:
print("Checking the FTPR RSA signature... ", end="")
print_check_partition_signature(mef, ftpr_offset + ftpr_mn2_offset)
f.close()
if not args.check:
print("Done! Good luck!")

+ 23
- 0
util/me_cleaner/setup.py View File

@ -0,0 +1,23 @@
#!/usr/bin/python
from setuptools import setup
setup(
name="me_cleaner",
version="1.2",
description="Tool for partial deblobbing of Intel ME/TXE firmware images",
url="https://github.com/corna/me_cleaner",
author="Nicola Corna",
author_email="nicola@corna.info",
license="GPLv3+",
scripts=['me_cleaner.py'],
classifiers=[
'Development Status :: 4 - Beta',
'Intended Audience :: Developers',
'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
'Operating System :: OS Independent',
'Programming Language :: Python :: 2',
'Programming Language :: Python :: 3',
]
)

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