From e0b8f048b2af6812bc7e381d20ce2db01356e7f1 Mon Sep 17 00:00:00 2001 From: Martin Kepplinger Date: Tue, 17 Apr 2018 20:00:31 +0200 Subject: [PATCH] add util/me_cleaner from me_cleaner-1.2 release archive --- util/me_cleaner/COPYING | 674 ++++++++++++++++++++++ util/me_cleaner/README.md | 86 +++ util/me_cleaner/man/me_cleaner.1 | 159 ++++++ util/me_cleaner/man/me_cleaner.md | 166 ++++++ util/me_cleaner/me_cleaner.py | 897 ++++++++++++++++++++++++++++++ util/me_cleaner/setup.py | 23 + 6 files changed, 2005 insertions(+) create mode 100644 util/me_cleaner/COPYING create mode 100644 util/me_cleaner/README.md create mode 100644 util/me_cleaner/man/me_cleaner.1 create mode 100644 util/me_cleaner/man/me_cleaner.md create mode 100755 util/me_cleaner/me_cleaner.py create mode 100755 util/me_cleaner/setup.py diff --git a/util/me_cleaner/COPYING b/util/me_cleaner/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/util/me_cleaner/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +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 +. + + 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 +. diff --git a/util/me_cleaner/README.md b/util/me_cleaner/README.md new file mode 100644 index 0000000..fb17f9e --- /dev/null +++ b/util/me_cleaner/README.md @@ -0,0 +1,86 @@ +# 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). + diff --git a/util/me_cleaner/man/me_cleaner.1 b/util/me_cleaner/man/me_cleaner.1 new file mode 100644 index 0000000..a7a90d8 --- /dev/null +++ b/util/me_cleaner/man/me_cleaner.1 @@ -0,0 +1,159 @@ +.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] diff --git a/util/me_cleaner/man/me_cleaner.md b/util/me_cleaner/man/me_cleaner.md new file mode 100644 index 0000000..cccabd5 --- /dev/null +++ b/util/me_cleaner/man/me_cleaner.md @@ -0,0 +1,166 @@ +[//]: # (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 + +SEE ALSO +-------- + +flashrom(8), [me\_cleaner's Wiki](https://github.com/corna/me_cleaner/wiki) diff --git a/util/me_cleaner/me_cleaner.py b/util/me_cleaner/me_cleaner.py new file mode 100755 index 0000000..69f5c0e --- /dev/null +++ b/util/me_cleaner/me_cleaner.py @@ -0,0 +1,897 @@ +#!/usr/bin/python + +# me_cleaner - Tool for partial deblobbing of Intel ME/TXE firmware images +# Copyright (C) 2016-2018 Nicola Corna +# +# 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("> 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(" 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("> 4) & 7 == 0x01: + llut_start = unpack("> 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("> 12 & 0xff0 + fmba = (flmap1 & 0xff) << 4 + fpsba = flmap1 >> 12 & 0xff0 + + f.seek(frba) + flreg = unpack("= 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("= 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("= 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(" 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("= 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(" {: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("