summaryrefslogtreecommitdiffstats
path: root/src/ukify/ukify.py
diff options
context:
space:
mode:
Diffstat (limited to 'src/ukify/ukify.py')
-rwxr-xr-xsrc/ukify/ukify.py1668
1 files changed, 1668 insertions, 0 deletions
diff --git a/src/ukify/ukify.py b/src/ukify/ukify.py
new file mode 100755
index 0000000..6abf1b6
--- /dev/null
+++ b/src/ukify/ukify.py
@@ -0,0 +1,1668 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# This file is part of systemd.
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd 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.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <https://www.gnu.org/licenses/>.
+
+# pylint: disable=import-outside-toplevel,consider-using-with,unused-argument
+# pylint: disable=unnecessary-lambda-assignment
+
+import argparse
+import configparser
+import contextlib
+import collections
+import dataclasses
+import datetime
+import fnmatch
+import itertools
+import json
+import os
+import pathlib
+import pprint
+import pydoc
+import re
+import shlex
+import shutil
+import socket
+import subprocess
+import sys
+import tempfile
+import textwrap
+from hashlib import sha256
+from typing import (Any,
+ Callable,
+ IO,
+ Optional,
+ Sequence,
+ Union)
+
+import pefile # type: ignore
+
+__version__ = '{{PROJECT_VERSION}} ({{GIT_VERSION}})'
+
+EFI_ARCH_MAP = {
+ # host_arch glob : [efi_arch, 32_bit_efi_arch if mixed mode is supported]
+ 'x86_64' : ['x64', 'ia32'],
+ 'i[3456]86' : ['ia32'],
+ 'aarch64' : ['aa64'],
+ 'armv[45678]*l': ['arm'],
+ 'loongarch32' : ['loongarch32'],
+ 'loongarch64' : ['loongarch64'],
+ 'riscv32' : ['riscv32'],
+ 'riscv64' : ['riscv64'],
+}
+EFI_ARCHES: list[str] = sum(EFI_ARCH_MAP.values(), [])
+
+# Default configuration directories and file name.
+# When the user does not specify one, the directories are searched in this order and the first file found is used.
+DEFAULT_CONFIG_DIRS = ['/run/systemd', '/etc/systemd', '/usr/local/lib/systemd', '/usr/lib/systemd']
+DEFAULT_CONFIG_FILE = 'ukify.conf'
+
+class Style:
+ bold = "\033[0;1;39m" if sys.stderr.isatty() else ""
+ gray = "\033[0;38;5;245m" if sys.stderr.isatty() else ""
+ red = "\033[31;1m" if sys.stderr.isatty() else ""
+ yellow = "\033[33;1m" if sys.stderr.isatty() else ""
+ reset = "\033[0m" if sys.stderr.isatty() else ""
+
+
+def guess_efi_arch():
+ arch = os.uname().machine
+
+ for glob, mapping in EFI_ARCH_MAP.items():
+ if fnmatch.fnmatch(arch, glob):
+ efi_arch, *fallback = mapping
+ break
+ else:
+ raise ValueError(f'Unsupported architecture {arch}')
+
+ # This makes sense only on some architectures, but it also probably doesn't
+ # hurt on others, so let's just apply the check everywhere.
+ if fallback:
+ fw_platform_size = pathlib.Path('/sys/firmware/efi/fw_platform_size')
+ try:
+ size = fw_platform_size.read_text().strip()
+ except FileNotFoundError:
+ pass
+ else:
+ if int(size) == 32:
+ efi_arch = fallback[0]
+
+ # print(f'Host arch {arch!r}, EFI arch {efi_arch!r}')
+ return efi_arch
+
+
+def page(text: str, enabled: Optional[bool]) -> None:
+ if enabled:
+ # Initialize less options from $SYSTEMD_LESS or provide a suitable fallback.
+ os.environ['LESS'] = os.getenv('SYSTEMD_LESS', 'FRSXMK')
+ pydoc.pager(text)
+ else:
+ print(text)
+
+
+def shell_join(cmd):
+ # TODO: drop in favour of shlex.join once shlex.join supports pathlib.Path.
+ return ' '.join(shlex.quote(str(x)) for x in cmd)
+
+
+def round_up(x, blocksize=4096):
+ return (x + blocksize - 1) // blocksize * blocksize
+
+
+def try_import(modname, name=None):
+ try:
+ return __import__(modname)
+ except ImportError as e:
+ raise ValueError(f'Kernel is compressed with {name or modname}, but module unavailable') from e
+
+
+def maybe_decompress(filename):
+ """Decompress file if compressed. Return contents."""
+ f = open(filename, 'rb')
+ start = f.read(4)
+ f.seek(0)
+
+ if start.startswith(b'\x7fELF'):
+ # not compressed
+ return f.read()
+
+ if start.startswith(b'MZ'):
+ # not compressed aarch64 and riscv64
+ return f.read()
+
+ if start.startswith(b'\x1f\x8b'):
+ gzip = try_import('gzip')
+ return gzip.open(f).read()
+
+ if start.startswith(b'\x28\xb5\x2f\xfd'):
+ zstd = try_import('zstd')
+ return zstd.uncompress(f.read())
+
+ if start.startswith(b'\x02\x21\x4c\x18'):
+ lz4 = try_import('lz4.frame', 'lz4')
+ return lz4.frame.decompress(f.read())
+
+ if start.startswith(b'\x04\x22\x4d\x18'):
+ print('Newer lz4 stream format detected! This may not boot!')
+ lz4 = try_import('lz4.frame', 'lz4')
+ return lz4.frame.decompress(f.read())
+
+ if start.startswith(b'\x89LZO'):
+ # python3-lzo is not packaged for Fedora
+ raise NotImplementedError('lzo decompression not implemented')
+
+ if start.startswith(b'BZh'):
+ bz2 = try_import('bz2', 'bzip2')
+ return bz2.open(f).read()
+
+ if start.startswith(b'\x5d\x00\x00'):
+ lzma = try_import('lzma')
+ return lzma.open(f).read()
+
+ raise NotImplementedError(f'unknown file format (starts with {start})')
+
+
+class Uname:
+ # This class is here purely as a namespace for the functions
+
+ VERSION_PATTERN = r'(?P<version>[a-z0-9._-]+) \([^ )]+\) (?:#.*)'
+
+ NOTES_PATTERN = r'^\s+Linux\s+0x[0-9a-f]+\s+OPEN\n\s+description data: (?P<version>[0-9a-f ]+)\s*$'
+
+ # Linux version 6.0.8-300.fc37.ppc64le (mockbuild@buildvm-ppc64le-03.iad2.fedoraproject.org)
+ # (gcc (GCC) 12.2.1 20220819 (Red Hat 12.2.1-2), GNU ld version 2.38-24.fc37)
+ # #1 SMP Fri Nov 11 14:39:11 UTC 2022
+ TEXT_PATTERN = rb'Linux version (?P<version>\d\.\S+) \('
+
+ @classmethod
+ def scrape_x86(cls, filename, opts=None):
+ # Based on https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/functions#L136
+ # and https://www.kernel.org/doc/html/latest/x86/boot.html#the-real-mode-kernel-header
+ with open(filename, 'rb') as f:
+ f.seek(0x202)
+ magic = f.read(4)
+ if magic != b'HdrS':
+ raise ValueError('Real-Mode Kernel Header magic not found')
+ f.seek(0x20E)
+ offset = f.read(1)[0] + f.read(1)[0]*256 # Pointer to kernel version string
+ f.seek(0x200 + offset)
+ text = f.read(128)
+ text = text.split(b'\0', maxsplit=1)[0]
+ text = text.decode()
+
+ if not (m := re.match(cls.VERSION_PATTERN, text)):
+ raise ValueError(f'Cannot parse version-host-release uname string: {text!r}')
+ return m.group('version')
+
+ @classmethod
+ def scrape_elf(cls, filename, opts=None):
+ readelf = find_tool('readelf', opts=opts)
+
+ cmd = [
+ readelf,
+ '--notes',
+ filename,
+ ]
+
+ print('+', shell_join(cmd))
+ try:
+ notes = subprocess.check_output(cmd, stderr=subprocess.PIPE, text=True)
+ except subprocess.CalledProcessError as e:
+ raise ValueError(e.stderr.strip()) from e
+
+ if not (m := re.search(cls.NOTES_PATTERN, notes, re.MULTILINE)):
+ raise ValueError('Cannot find Linux version note')
+
+ text = ''.join(chr(int(c, 16)) for c in m.group('version').split())
+ return text.rstrip('\0')
+
+ @classmethod
+ def scrape_generic(cls, filename, opts=None):
+ # import libarchive
+ # libarchive-c fails with
+ # ArchiveError: Unrecognized archive format (errno=84, retcode=-30, archive_p=94705420454656)
+
+ # Based on https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/functions#L209
+
+ text = maybe_decompress(filename)
+ if not (m := re.search(cls.TEXT_PATTERN, text)):
+ raise ValueError(f'Cannot find {cls.TEXT_PATTERN!r} in {filename}')
+
+ return m.group('version').decode()
+
+ @classmethod
+ def scrape(cls, filename, opts=None):
+ for func in (cls.scrape_x86, cls.scrape_elf, cls.scrape_generic):
+ try:
+ version = func(filename, opts=opts)
+ print(f'Found uname version: {version}')
+ return version
+ except ValueError as e:
+ print(str(e))
+ return None
+
+DEFAULT_SECTIONS_TO_SHOW = {
+ '.linux' : 'binary',
+ '.initrd' : 'binary',
+ '.splash' : 'binary',
+ '.dtb' : 'binary',
+ '.cmdline' : 'text',
+ '.osrel' : 'text',
+ '.uname' : 'text',
+ '.pcrpkey' : 'text',
+ '.pcrsig' : 'text',
+ '.sbat' : 'text',
+ '.sbom' : 'binary',
+}
+
+@dataclasses.dataclass
+class Section:
+ name: str
+ content: Optional[pathlib.Path]
+ tmpfile: Optional[IO] = None
+ measure: bool = False
+ output_mode: Optional[str] = None
+
+ @classmethod
+ def create(cls, name, contents, **kwargs):
+ if isinstance(contents, (str, bytes)):
+ mode = 'wt' if isinstance(contents, str) else 'wb'
+ tmp = tempfile.NamedTemporaryFile(mode=mode, prefix=f'tmp{name}')
+ tmp.write(contents)
+ tmp.flush()
+ contents = pathlib.Path(tmp.name)
+ else:
+ tmp = None
+
+ return cls(name, contents, tmpfile=tmp, **kwargs)
+
+ @classmethod
+ def parse_input(cls, s):
+ try:
+ name, contents, *rest = s.split(':')
+ except ValueError as e:
+ raise ValueError(f'Cannot parse section spec (name or contents missing): {s!r}') from e
+ if rest:
+ raise ValueError(f'Cannot parse section spec (extraneous parameters): {s!r}')
+
+ if contents.startswith('@'):
+ contents = pathlib.Path(contents[1:])
+
+ sec = cls.create(name, contents)
+ sec.check_name()
+ return sec
+
+ @classmethod
+ def parse_output(cls, s):
+ if not (m := re.match(r'([a-zA-Z0-9_.]+):(text|binary)(?:@(.+))?', s)):
+ raise ValueError(f'Cannot parse section spec: {s!r}')
+
+ name, ttype, out = m.groups()
+ out = pathlib.Path(out) if out else None
+
+ return cls.create(name, out, output_mode=ttype)
+
+ def size(self):
+ return self.content.stat().st_size
+
+ def check_name(self):
+ # PE section names with more than 8 characters are legal, but our stub does
+ # not support them.
+ if not self.name.isascii() or not self.name.isprintable():
+ raise ValueError(f'Bad section name: {self.name!r}')
+ if len(self.name) > 8:
+ raise ValueError(f'Section name too long: {self.name!r}')
+
+
+@dataclasses.dataclass
+class UKI:
+ executable: list[Union[pathlib.Path, str]]
+ sections: list[Section] = dataclasses.field(default_factory=list, init=False)
+
+ def add_section(self, section):
+ if section.name in [s.name for s in self.sections]:
+ raise ValueError(f'Duplicate section {section.name}')
+
+ self.sections += [section]
+
+
+def parse_banks(s):
+ banks = re.split(r',|\s+', s)
+ # TODO: do some sanity checking here
+ return banks
+
+
+KNOWN_PHASES = (
+ 'enter-initrd',
+ 'leave-initrd',
+ 'sysinit',
+ 'ready',
+ 'shutdown',
+ 'final',
+)
+
+def parse_phase_paths(s):
+ # Split on commas or whitespace here. Commas might be hard to parse visually.
+ paths = re.split(r',|\s+', s)
+
+ for path in paths:
+ for phase in path.split(':'):
+ if phase not in KNOWN_PHASES:
+ raise argparse.ArgumentTypeError(f'Unknown boot phase {phase!r} ({path=})')
+
+ return paths
+
+
+def check_splash(filename):
+ if filename is None:
+ return
+
+ # import is delayed, to avoid import when the splash image is not used
+ try:
+ from PIL import Image
+ except ImportError:
+ return
+
+ img = Image.open(filename, formats=['BMP'])
+ print(f'Splash image {filename} is {img.width}×{img.height} pixels')
+
+
+def check_inputs(opts):
+ for name, value in vars(opts).items():
+ if name in {'output', 'tools'}:
+ continue
+
+ if isinstance(value, pathlib.Path):
+ # Open file to check that we can read it, or generate an exception
+ value.open().close()
+ elif isinstance(value, list):
+ for item in value:
+ if isinstance(item, pathlib.Path):
+ item.open().close()
+
+ check_splash(opts.splash)
+
+
+def check_cert_and_keys_nonexistent(opts):
+ # Raise if any of the keys and certs are found on disk
+ paths = itertools.chain(
+ (opts.sb_key, opts.sb_cert),
+ *((priv_key, pub_key)
+ for priv_key, pub_key, _ in key_path_groups(opts)))
+ for path in paths:
+ if path and path.exists():
+ raise ValueError(f'{path} is present')
+
+
+def find_tool(name, fallback=None, opts=None):
+ if opts and opts.tools:
+ for d in opts.tools:
+ tool = d / name
+ if tool.exists():
+ return tool
+
+ if shutil.which(name) is not None:
+ return name
+
+ if fallback is None:
+ print(f"Tool {name} not installed!")
+
+ return fallback
+
+def combine_signatures(pcrsigs):
+ combined = collections.defaultdict(list)
+ for pcrsig in pcrsigs:
+ for bank, sigs in pcrsig.items():
+ for sig in sigs:
+ if sig not in combined[bank]:
+ combined[bank] += [sig]
+ return json.dumps(combined)
+
+
+def key_path_groups(opts):
+ if not opts.pcr_private_keys:
+ return
+
+ n_priv = len(opts.pcr_private_keys)
+ pub_keys = opts.pcr_public_keys or [None] * n_priv
+ pp_groups = opts.phase_path_groups or [None] * n_priv
+
+ yield from zip(opts.pcr_private_keys,
+ pub_keys,
+ pp_groups)
+
+
+def call_systemd_measure(uki, linux, opts):
+ measure_tool = find_tool('systemd-measure',
+ '/usr/lib/systemd/systemd-measure',
+ opts=opts)
+
+ banks = opts.pcr_banks or ()
+
+ # PCR measurement
+
+ if opts.measure:
+ pp_groups = opts.phase_path_groups or []
+
+ cmd = [
+ measure_tool,
+ 'calculate',
+ f'--linux={linux}',
+ *(f"--{s.name.removeprefix('.')}={s.content}"
+ for s in uki.sections
+ if s.measure),
+ *(f'--bank={bank}'
+ for bank in banks),
+ # For measurement, the keys are not relevant, so we can lump all the phase paths
+ # into one call to systemd-measure calculate.
+ *(f'--phase={phase_path}'
+ for phase_path in itertools.chain.from_iterable(pp_groups)),
+ ]
+
+ print('+', shell_join(cmd))
+ subprocess.check_call(cmd)
+
+ # PCR signing
+
+ if opts.pcr_private_keys:
+ pcrsigs = []
+
+ cmd = [
+ measure_tool,
+ 'sign',
+ f'--linux={linux}',
+ *(f"--{s.name.removeprefix('.')}={s.content}"
+ for s in uki.sections
+ if s.measure),
+ *(f'--bank={bank}'
+ for bank in banks),
+ ]
+
+ for priv_key, pub_key, group in key_path_groups(opts):
+ extra = [f'--private-key={priv_key}']
+ if pub_key:
+ extra += [f'--public-key={pub_key}']
+ extra += [f'--phase={phase_path}' for phase_path in group or ()]
+
+ print('+', shell_join(cmd + extra))
+ pcrsig = subprocess.check_output(cmd + extra, text=True)
+ pcrsig = json.loads(pcrsig)
+ pcrsigs += [pcrsig]
+
+ combined = combine_signatures(pcrsigs)
+ uki.add_section(Section.create('.pcrsig', combined))
+
+
+def join_initrds(initrds):
+ if not initrds:
+ return None
+ if len(initrds) == 1:
+ return initrds[0]
+
+ seq = []
+ for file in initrds:
+ initrd = file.read_bytes()
+ n = len(initrd)
+ padding = b'\0' * (round_up(n, 4) - n) # pad to 32 bit alignment
+ seq += [initrd, padding]
+
+ return b''.join(seq)
+
+
+def pairwise(iterable):
+ a, b = itertools.tee(iterable)
+ next(b, None)
+ return zip(a, b)
+
+
+class PEError(Exception):
+ pass
+
+
+def pe_add_sections(uki: UKI, output: str):
+ pe = pefile.PE(uki.executable, fast_load=True)
+
+ # Old stubs do not have the symbol/string table stripped, even though image files should not have one.
+ if symbol_table := pe.FILE_HEADER.PointerToSymbolTable:
+ symbol_table_size = 18 * pe.FILE_HEADER.NumberOfSymbols
+ if string_table_size := pe.get_dword_from_offset(symbol_table + symbol_table_size):
+ symbol_table_size += string_table_size
+
+ # Let's be safe and only strip it if it's at the end of the file.
+ if symbol_table + symbol_table_size == len(pe.__data__):
+ pe.__data__ = pe.__data__[:symbol_table]
+ pe.FILE_HEADER.PointerToSymbolTable = 0
+ pe.FILE_HEADER.NumberOfSymbols = 0
+ pe.FILE_HEADER.IMAGE_FILE_LOCAL_SYMS_STRIPPED = True
+
+ # Old stubs might have been stripped, leading to unaligned raw data values, so let's fix them up here.
+ # pylint thinks that Structure doesn't have various members that it has…
+ # pylint: disable=no-member
+
+ for i, section in enumerate(pe.sections):
+ oldp = section.PointerToRawData
+ oldsz = section.SizeOfRawData
+ section.PointerToRawData = round_up(oldp, pe.OPTIONAL_HEADER.FileAlignment)
+ section.SizeOfRawData = round_up(oldsz, pe.OPTIONAL_HEADER.FileAlignment)
+ padp = section.PointerToRawData - oldp
+ padsz = section.SizeOfRawData - oldsz
+
+ for later_section in pe.sections[i+1:]:
+ later_section.PointerToRawData += padp + padsz
+
+ pe.__data__ = pe.__data__[:oldp] + bytes(padp) + pe.__data__[oldp:oldp+oldsz] + bytes(padsz) + pe.__data__[oldp+oldsz:]
+
+ # We might not have any space to add new sections. Let's try our best to make some space by padding the
+ # SizeOfHeaders to a multiple of the file alignment. This is safe because the first section's data starts
+ # at a multiple of the file alignment, so all space before that is unused.
+ pe.OPTIONAL_HEADER.SizeOfHeaders = round_up(pe.OPTIONAL_HEADER.SizeOfHeaders, pe.OPTIONAL_HEADER.FileAlignment)
+ pe = pefile.PE(data=pe.write(), fast_load=True)
+
+ warnings = pe.get_warnings()
+ if warnings:
+ raise PEError(f'pefile warnings treated as errors: {warnings}')
+
+ security = pe.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_SECURITY']]
+ if security.VirtualAddress != 0:
+ # We could strip the signatures, but why would anyone sign the stub?
+ raise PEError('Stub image is signed, refusing.')
+
+ for section in uki.sections:
+ new_section = pefile.SectionStructure(pe.__IMAGE_SECTION_HEADER_format__, pe=pe)
+ new_section.__unpack__(b'\0' * new_section.sizeof())
+
+ offset = pe.sections[-1].get_file_offset() + new_section.sizeof()
+ if offset + new_section.sizeof() > pe.OPTIONAL_HEADER.SizeOfHeaders:
+ raise PEError(f'Not enough header space to add section {section.name}.')
+
+ assert section.content
+ data = section.content.read_bytes()
+
+ new_section.set_file_offset(offset)
+ new_section.Name = section.name.encode()
+ new_section.Misc_VirtualSize = len(data)
+ # Non-stripped stubs might still have an unaligned symbol table at the end, making their size
+ # unaligned, so we make sure to explicitly pad the pointer to new sections to an aligned offset.
+ new_section.PointerToRawData = round_up(len(pe.__data__), pe.OPTIONAL_HEADER.FileAlignment)
+ new_section.SizeOfRawData = round_up(len(data), pe.OPTIONAL_HEADER.FileAlignment)
+ new_section.VirtualAddress = round_up(
+ pe.sections[-1].VirtualAddress + pe.sections[-1].Misc_VirtualSize,
+ pe.OPTIONAL_HEADER.SectionAlignment,
+ )
+
+ new_section.IMAGE_SCN_MEM_READ = True
+ if section.name == '.linux':
+ # Old kernels that use EFI handover protocol will be executed inline.
+ new_section.IMAGE_SCN_CNT_CODE = True
+ else:
+ new_section.IMAGE_SCN_CNT_INITIALIZED_DATA = True
+
+ # Special case, mostly for .sbat: the stub will already have a .sbat section, but we want to append
+ # the one from the kernel to it. It should be small enough to fit in the existing section, so just
+ # swap the data.
+ for i, s in enumerate(pe.sections):
+ if s.Name.rstrip(b"\x00").decode() == section.name:
+ if new_section.Misc_VirtualSize > s.SizeOfRawData:
+ raise PEError(f'Not enough space in existing section {section.name} to append new data.')
+
+ padding = bytes(new_section.SizeOfRawData - new_section.Misc_VirtualSize)
+ pe.__data__ = pe.__data__[:s.PointerToRawData] + data + padding + pe.__data__[pe.sections[i+1].PointerToRawData:]
+ s.SizeOfRawData = new_section.SizeOfRawData
+ s.Misc_VirtualSize = new_section.Misc_VirtualSize
+ break
+ else:
+ pe.__data__ = pe.__data__[:] + bytes(new_section.PointerToRawData - len(pe.__data__)) + data + bytes(new_section.SizeOfRawData - len(data))
+
+ pe.FILE_HEADER.NumberOfSections += 1
+ pe.OPTIONAL_HEADER.SizeOfInitializedData += new_section.Misc_VirtualSize
+ pe.__structures__.append(new_section)
+ pe.sections.append(new_section)
+
+ pe.OPTIONAL_HEADER.CheckSum = 0
+ pe.OPTIONAL_HEADER.SizeOfImage = round_up(
+ pe.sections[-1].VirtualAddress + pe.sections[-1].Misc_VirtualSize,
+ pe.OPTIONAL_HEADER.SectionAlignment,
+ )
+
+ pe.write(output)
+
+def merge_sbat(input_pe: [pathlib.Path], input_text: [str]) -> str:
+ sbat = []
+
+ for f in input_pe:
+ try:
+ pe = pefile.PE(f, fast_load=True)
+ except pefile.PEFormatError:
+ print(f"{f} is not a valid PE file, not extracting SBAT section.")
+ continue
+
+ for section in pe.sections:
+ if section.Name.rstrip(b"\x00").decode() == ".sbat":
+ split = section.get_data().rstrip(b"\x00").decode().splitlines()
+ if not split[0].startswith('sbat,'):
+ print(f"{f} does not contain a valid SBAT section, skipping.")
+ continue
+ # Filter out the sbat line, we'll add it back later, there needs to be only one and it
+ # needs to be first.
+ sbat += split[1:]
+
+ for t in input_text:
+ if t.startswith('@'):
+ t = pathlib.Path(t[1:]).read_text()
+ split = t.splitlines()
+ if not split[0].startswith('sbat,'):
+ print(f"{t} does not contain a valid SBAT section, skipping.")
+ continue
+ sbat += split[1:]
+
+ return 'sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md\n' + '\n'.join(sbat) + "\n\x00"
+
+def signer_sign(cmd):
+ print('+', shell_join(cmd))
+ subprocess.check_call(cmd)
+
+def find_sbsign(opts=None):
+ return find_tool('sbsign', opts=opts)
+
+def sbsign_sign(sbsign_tool, input_f, output_f, opts=None):
+ sign_invocation = [
+ sbsign_tool,
+ '--key', opts.sb_key,
+ '--cert', opts.sb_cert,
+ input_f,
+ '--output', output_f,
+ ]
+ if opts.signing_engine is not None:
+ sign_invocation += ['--engine', opts.signing_engine]
+ signer_sign(sign_invocation)
+
+def find_pesign(opts=None):
+ return find_tool('pesign', opts=opts)
+
+def pesign_sign(pesign_tool, input_f, output_f, opts=None):
+ sign_invocation = [
+ pesign_tool, '-s', '--force',
+ '-n', opts.sb_certdir,
+ '-c', opts.sb_cert_name,
+ '-i', input_f,
+ '-o', output_f,
+ ]
+ signer_sign(sign_invocation)
+
+SBVERIFY = {
+ 'name': 'sbverify',
+ 'option': '--list',
+ 'output': 'No signature table present',
+}
+
+PESIGCHECK = {
+ 'name': 'pesign',
+ 'option': '-i',
+ 'output': 'No signatures found.',
+ 'flags': '-S'
+}
+
+def verify(tool, opts):
+ verify_tool = find_tool(tool['name'], opts=opts)
+ cmd = [
+ verify_tool,
+ tool['option'],
+ opts.linux,
+ ]
+ if 'flags' in tool:
+ cmd.append(tool['flags'])
+
+ print('+', shell_join(cmd))
+ info = subprocess.check_output(cmd, text=True)
+
+ return tool['output'] in info
+
+def make_uki(opts):
+ # kernel payload signing
+
+ sign_tool = None
+ sign_args_present = opts.sb_key or opts.sb_cert_name
+ sign_kernel = opts.sign_kernel
+ sign = None
+ linux = opts.linux
+
+ if sign_args_present:
+ if opts.signtool == 'sbsign':
+ sign_tool = find_sbsign(opts=opts)
+ sign = sbsign_sign
+ verify_tool = SBVERIFY
+ else:
+ sign_tool = find_pesign(opts=opts)
+ sign = pesign_sign
+ verify_tool = PESIGCHECK
+
+ if sign_tool is None:
+ raise ValueError(f'{opts.signtool}, required for signing, is not installed')
+
+ if sign_kernel is None and opts.linux is not None:
+ # figure out if we should sign the kernel
+ sign_kernel = verify(verify_tool, opts)
+
+ if sign_kernel:
+ linux_signed = tempfile.NamedTemporaryFile(prefix='linux-signed')
+ linux = pathlib.Path(linux_signed.name)
+ sign(sign_tool, opts.linux, linux, opts=opts)
+
+ if opts.uname is None and opts.linux is not None:
+ print('Kernel version not specified, starting autodetection 😖.')
+ opts.uname = Uname.scrape(opts.linux, opts=opts)
+
+ uki = UKI(opts.stub)
+ initrd = join_initrds(opts.initrd)
+
+ pcrpkey = opts.pcrpkey
+ if pcrpkey is None:
+ if opts.pcr_public_keys and len(opts.pcr_public_keys) == 1:
+ pcrpkey = opts.pcr_public_keys[0]
+ elif opts.pcr_private_keys and len(opts.pcr_private_keys) == 1:
+ import cryptography.hazmat.primitives.serialization as serialization
+ privkey = serialization.load_pem_private_key(opts.pcr_private_keys[0].read_bytes(), password=None)
+ pcrpkey = privkey.public_key().public_bytes(
+ encoding=serialization.Encoding.PEM,
+ format=serialization.PublicFormat.SubjectPublicKeyInfo,
+ )
+
+ sections = [
+ # name, content, measure?
+ ('.osrel', opts.os_release, True ),
+ ('.cmdline', opts.cmdline, True ),
+ ('.dtb', opts.devicetree, True ),
+ ('.uname', opts.uname, True ),
+ ('.splash', opts.splash, True ),
+ ('.pcrpkey', pcrpkey, True ),
+ ('.initrd', initrd, True ),
+
+ # linux shall be last to leave breathing room for decompression.
+ # We'll add it later.
+ ]
+
+ for name, content, measure in sections:
+ if content:
+ uki.add_section(Section.create(name, content, measure=measure))
+
+ # systemd-measure doesn't know about those extra sections
+ for section in opts.sections:
+ uki.add_section(section)
+
+ if linux is not None:
+ # Merge the .sbat sections from stub, kernel and parameter, so that revocation can be done on either.
+ uki.add_section(Section.create('.sbat', merge_sbat([opts.stub, linux], opts.sbat), measure=True))
+ else:
+ # Addons don't use the stub so we add SBAT manually
+ if not opts.sbat:
+ opts.sbat = ["""sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
+uki,1,UKI,uki,1,https://www.freedesktop.org/software/systemd/man/systemd-stub.html
+"""]
+ uki.add_section(Section.create('.sbat', merge_sbat([], opts.sbat), measure=False))
+
+ # PCR measurement and signing
+
+ # We pass in the contents for .linux separately because we need them to do the measurement but can't add
+ # the section yet because we want .linux to be the last section. Make sure any other sections are added
+ # before this function is called.
+ call_systemd_measure(uki, linux, opts=opts)
+
+ # UKI creation
+
+ if linux is not None:
+ uki.add_section(Section.create('.linux', linux, measure=True))
+
+ if sign_args_present:
+ unsigned = tempfile.NamedTemporaryFile(prefix='uki')
+ unsigned_output = unsigned.name
+ else:
+ unsigned_output = opts.output
+
+ pe_add_sections(uki, unsigned_output)
+
+ # UKI signing
+
+ if sign_args_present:
+ assert sign
+ sign(sign_tool, unsigned_output, opts.output, opts=opts)
+
+ # We end up with no executable bits, let's reapply them
+ os.umask(umask := os.umask(0))
+ os.chmod(opts.output, 0o777 & ~umask)
+
+ print(f"Wrote {'signed' if sign_args_present else 'unsigned'} {opts.output}")
+
+
+
+@contextlib.contextmanager
+def temporary_umask(mask: int):
+ # Drop <mask> bits from umask
+ old = os.umask(0)
+ os.umask(old | mask)
+ try:
+ yield
+ finally:
+ os.umask(old)
+
+
+def generate_key_cert_pair(
+ common_name: str,
+ valid_days: int,
+ keylength: int = 2048,
+) -> tuple[bytes]:
+
+ from cryptography import x509
+ from cryptography.hazmat.primitives import serialization, hashes
+ from cryptography.hazmat.primitives.asymmetric import rsa
+
+ # We use a keylength of 2048 bits. That is what Microsoft documents as
+ # supported/expected:
+ # https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/windows-secure-boot-key-creation-and-management-guidance?view=windows-11#12-public-key-cryptography
+
+ now = datetime.datetime.now(datetime.timezone.utc)
+
+ key = rsa.generate_private_key(
+ public_exponent=65537,
+ key_size=keylength,
+ )
+ cert = x509.CertificateBuilder(
+ ).subject_name(
+ x509.Name([x509.NameAttribute(x509.oid.NameOID.COMMON_NAME, common_name)])
+ ).issuer_name(
+ x509.Name([x509.NameAttribute(x509.oid.NameOID.COMMON_NAME, common_name)])
+ ).not_valid_before(
+ now,
+ ).not_valid_after(
+ now + datetime.timedelta(days=valid_days)
+ ).serial_number(
+ x509.random_serial_number()
+ ).public_key(
+ key.public_key()
+ ).add_extension(
+ x509.BasicConstraints(ca=False, path_length=None),
+ critical=True,
+ ).sign(
+ private_key=key,
+ algorithm=hashes.SHA256(),
+ )
+
+ cert_pem = cert.public_bytes(
+ encoding=serialization.Encoding.PEM,
+ )
+ key_pem = key.private_bytes(
+ encoding=serialization.Encoding.PEM,
+ format=serialization.PrivateFormat.TraditionalOpenSSL,
+ encryption_algorithm=serialization.NoEncryption(),
+ )
+
+ return key_pem, cert_pem
+
+
+def generate_priv_pub_key_pair(keylength : int = 2048) -> tuple[bytes]:
+ from cryptography.hazmat.primitives import serialization
+ from cryptography.hazmat.primitives.asymmetric import rsa
+
+ key = rsa.generate_private_key(
+ public_exponent=65537,
+ key_size=keylength,
+ )
+ priv_key_pem = key.private_bytes(
+ encoding=serialization.Encoding.PEM,
+ format=serialization.PrivateFormat.TraditionalOpenSSL,
+ encryption_algorithm=serialization.NoEncryption(),
+ )
+ pub_key_pem = key.public_key().public_bytes(
+ encoding=serialization.Encoding.PEM,
+ format=serialization.PublicFormat.SubjectPublicKeyInfo,
+ )
+
+ return priv_key_pem, pub_key_pem
+
+
+def generate_keys(opts):
+ work = False
+
+ # This will generate keys and certificates and write them to the paths that
+ # are specified as input paths.
+ if opts.sb_key or opts.sb_cert:
+ fqdn = socket.getfqdn()
+ cn = f'SecureBoot signing key on host {fqdn}'
+ key_pem, cert_pem = generate_key_cert_pair(
+ common_name=cn,
+ valid_days=opts.sb_cert_validity,
+ )
+ print(f'Writing SecureBoot private key to {opts.sb_key}')
+ with temporary_umask(0o077):
+ opts.sb_key.write_bytes(key_pem)
+ print(f'Writing SecureBoot certificate to {opts.sb_cert}')
+ opts.sb_cert.write_bytes(cert_pem)
+
+ work = True
+
+ for priv_key, pub_key, _ in key_path_groups(opts):
+ priv_key_pem, pub_key_pem = generate_priv_pub_key_pair()
+
+ print(f'Writing private key for PCR signing to {priv_key}')
+ with temporary_umask(0o077):
+ priv_key.write_bytes(priv_key_pem)
+ if pub_key:
+ print(f'Writing public key for PCR signing to {pub_key}')
+ pub_key.write_bytes(pub_key_pem)
+
+ work = True
+
+ if not work:
+ raise ValueError('genkey: --secureboot-private-key=/--secureboot-certificate= or --pcr-private-key/--pcr-public-key must be specified')
+
+
+def inspect_section(opts, section):
+ name = section.Name.rstrip(b"\x00").decode()
+
+ # find the config for this section in opts and whether to show it
+ config = opts.sections_by_name.get(name, None)
+ show = (config or
+ opts.all or
+ (name in DEFAULT_SECTIONS_TO_SHOW and not opts.sections))
+ if not show:
+ return name, None
+
+ ttype = config.output_mode if config else DEFAULT_SECTIONS_TO_SHOW.get(name, 'binary')
+
+ size = section.Misc_VirtualSize
+ # TODO: Use ignore_padding once we can depend on a newer version of pefile
+ data = section.get_data(length=size)
+ digest = sha256(data).hexdigest()
+
+ struct = {
+ 'size' : size,
+ 'sha256' : digest,
+ }
+
+ if ttype == 'text':
+ try:
+ struct['text'] = data.decode()
+ except UnicodeDecodeError as e:
+ print(f"Section {name!r} is not valid text: {e}")
+ struct['text'] = '(not valid UTF-8)'
+
+ if config and config.content:
+ assert isinstance(config.content, pathlib.Path)
+ config.content.write_bytes(data)
+
+ if opts.json == 'off':
+ print(f"{name}:\n size: {size} bytes\n sha256: {digest}")
+ if ttype == 'text':
+ text = textwrap.indent(struct['text'].rstrip(), ' ' * 4)
+ print(f" text:\n{text}")
+
+ return name, struct
+
+
+def inspect_sections(opts):
+ indent = 4 if opts.json == 'pretty' else None
+
+ for file in opts.files:
+ pe = pefile.PE(file, fast_load=True)
+ gen = (inspect_section(opts, section) for section in pe.sections)
+ descs = {key:val for (key, val) in gen if val}
+ if opts.json != 'off':
+ json.dump(descs, sys.stdout, indent=indent)
+
+
+@dataclasses.dataclass(frozen=True)
+class ConfigItem:
+ @staticmethod
+ def config_list_prepend(
+ namespace: argparse.Namespace,
+ group: Optional[str],
+ dest: str,
+ value: Any,
+ ) -> None:
+ "Prepend value to namespace.<dest>"
+
+ assert not group
+
+ old = getattr(namespace, dest, [])
+ if old is None:
+ old = []
+ setattr(namespace, dest, value + old)
+
+ @staticmethod
+ def config_set_if_unset(
+ namespace: argparse.Namespace,
+ group: Optional[str],
+ dest: str,
+ value: Any,
+ ) -> None:
+ "Set namespace.<dest> to value only if it was None"
+
+ assert not group
+
+ if getattr(namespace, dest) is None:
+ setattr(namespace, dest, value)
+
+ @staticmethod
+ def config_set(
+ namespace: argparse.Namespace,
+ group: Optional[str],
+ dest: str,
+ value: Any,
+ ) -> None:
+ "Set namespace.<dest> to value only if it was None"
+
+ assert not group
+
+ setattr(namespace, dest, value)
+
+ @staticmethod
+ def config_set_group(
+ namespace: argparse.Namespace,
+ group: Optional[str],
+ dest: str,
+ value: Any,
+ ) -> None:
+ "Set namespace.<dest>[idx] to value, with idx derived from group"
+
+ # pylint: disable=protected-access
+ if group not in namespace._groups:
+ namespace._groups += [group]
+ idx = namespace._groups.index(group)
+
+ old = getattr(namespace, dest, None)
+ if old is None:
+ old = []
+ setattr(namespace, dest,
+ old + ([None] * (idx - len(old))) + [value])
+
+ @staticmethod
+ def parse_boolean(s: str) -> bool:
+ "Parse 1/true/yes/y/t/on as true and 0/false/no/n/f/off/None as false"
+ s_l = s.lower()
+ if s_l in {'1', 'true', 'yes', 'y', 't', 'on'}:
+ return True
+ if s_l in {'0', 'false', 'no', 'n', 'f', 'off'}:
+ return False
+ raise ValueError('f"Invalid boolean literal: {s!r}')
+
+ # arguments for argparse.ArgumentParser.add_argument()
+ name: Union[str, tuple[str, str]]
+ dest: Optional[str] = None
+ metavar: Optional[str] = None
+ type: Optional[Callable] = None
+ nargs: Optional[str] = None
+ action: Optional[Union[str, Callable]] = None
+ default: Any = None
+ version: Optional[str] = None
+ choices: Optional[tuple[str, ...]] = None
+ const: Optional[Any] = None
+ help: Optional[str] = None
+
+ # metadata for config file parsing
+ config_key: Optional[str] = None
+ config_push: Callable[[argparse.Namespace, Optional[str], str, Any], None] = \
+ config_set_if_unset
+
+ def _names(self) -> tuple[str, ...]:
+ return self.name if isinstance(self.name, tuple) else (self.name,)
+
+ def argparse_dest(self) -> str:
+ # It'd be nice if argparse exported this, but I don't see that in the API
+ if self.dest:
+ return self.dest
+ return self._names()[0].lstrip('-').replace('-', '_')
+
+ def add_to(self, parser: argparse.ArgumentParser):
+ kwargs = { key:val
+ for key in dataclasses.asdict(self)
+ if (key not in ('name', 'config_key', 'config_push') and
+ (val := getattr(self, key)) is not None) }
+ args = self._names()
+ parser.add_argument(*args, **kwargs)
+
+ def apply_config(self, namespace, section, group, key, value) -> None:
+ assert f'{section}/{key}' == self.config_key
+ dest = self.argparse_dest()
+
+ conv: Callable[[str], Any]
+ if self.action == argparse.BooleanOptionalAction:
+ # We need to handle this case separately: the options are called
+ # --foo and --no-foo, and no argument is parsed. But in the config
+ # file, we have Foo=yes or Foo=no.
+ conv = self.parse_boolean
+ elif self.type:
+ conv = self.type
+ else:
+ conv = lambda s:s
+
+ # This is a bit ugly, but --initrd is the only option which is specified
+ # with multiple args on the command line and a space-separated list in the
+ # config file.
+ if self.name == '--initrd':
+ value = [conv(v) for v in value.split()]
+ else:
+ value = conv(value)
+
+ self.config_push(namespace, group, dest, value)
+
+ def config_example(self) -> tuple[Optional[str], Optional[str], Optional[str]]:
+ if not self.config_key:
+ return None, None, None
+ section_name, key = self.config_key.split('/', 1)
+ if section_name.endswith(':'):
+ section_name += 'NAME'
+ if self.choices:
+ value = '|'.join(self.choices)
+ else:
+ value = self.metavar or self.argparse_dest().upper()
+ return (section_name, key, value)
+
+
+VERBS = ('build', 'genkey', 'inspect')
+
+CONFIG_ITEMS = [
+ ConfigItem(
+ 'positional',
+ metavar = 'VERB',
+ nargs = '*',
+ help = argparse.SUPPRESS,
+ ),
+
+ ConfigItem(
+ '--version',
+ action = 'version',
+ version = f'ukify {__version__}',
+ ),
+
+ ConfigItem(
+ '--summary',
+ help = 'print parsed config and exit',
+ action = 'store_true',
+ ),
+
+ ConfigItem(
+ '--linux',
+ type = pathlib.Path,
+ help = 'vmlinuz file [.linux section]',
+ config_key = 'UKI/Linux',
+ ),
+
+ ConfigItem(
+ '--initrd',
+ metavar = 'INITRD',
+ type = pathlib.Path,
+ action = 'append',
+ help = 'initrd file [part of .initrd section]',
+ config_key = 'UKI/Initrd',
+ config_push = ConfigItem.config_list_prepend,
+ ),
+
+ ConfigItem(
+ ('--config', '-c'),
+ metavar = 'PATH',
+ type = pathlib.Path,
+ help = 'configuration file',
+ ),
+
+ ConfigItem(
+ '--cmdline',
+ metavar = 'TEXT|@PATH',
+ help = 'kernel command line [.cmdline section]',
+ config_key = 'UKI/Cmdline',
+ ),
+
+ ConfigItem(
+ '--os-release',
+ metavar = 'TEXT|@PATH',
+ help = 'path to os-release file [.osrel section]',
+ config_key = 'UKI/OSRelease',
+ ),
+
+ ConfigItem(
+ '--devicetree',
+ metavar = 'PATH',
+ type = pathlib.Path,
+ help = 'Device Tree file [.dtb section]',
+ config_key = 'UKI/DeviceTree',
+ ),
+ ConfigItem(
+ '--splash',
+ metavar = 'BMP',
+ type = pathlib.Path,
+ help = 'splash image bitmap file [.splash section]',
+ config_key = 'UKI/Splash',
+ ),
+ ConfigItem(
+ '--pcrpkey',
+ metavar = 'KEY',
+ type = pathlib.Path,
+ help = 'embedded public key to seal secrets to [.pcrpkey section]',
+ config_key = 'UKI/PCRPKey',
+ ),
+ ConfigItem(
+ '--uname',
+ metavar='VERSION',
+ help='"uname -r" information [.uname section]',
+ config_key = 'UKI/Uname',
+ ),
+
+ ConfigItem(
+ '--efi-arch',
+ metavar = 'ARCH',
+ choices = ('ia32', 'x64', 'arm', 'aa64', 'riscv64'),
+ help = 'target EFI architecture',
+ config_key = 'UKI/EFIArch',
+ ),
+
+ ConfigItem(
+ '--stub',
+ type = pathlib.Path,
+ help = 'path to the sd-stub file [.text,.data,… sections]',
+ config_key = 'UKI/Stub',
+ ),
+
+ ConfigItem(
+ '--sbat',
+ metavar = 'TEXT|@PATH',
+ help = 'SBAT policy [.sbat section]',
+ default = [],
+ action = 'append',
+ config_key = 'UKI/SBAT',
+ ),
+
+ ConfigItem(
+ '--section',
+ dest = 'sections',
+ metavar = 'NAME:TEXT|@PATH',
+ action = 'append',
+ default = [],
+ help = 'section as name and contents [NAME section] or section to print',
+ ),
+
+ ConfigItem(
+ '--pcr-banks',
+ metavar = 'BANK…',
+ type = parse_banks,
+ config_key = 'UKI/PCRBanks',
+ ),
+
+ ConfigItem(
+ '--signing-engine',
+ metavar = 'ENGINE',
+ help = 'OpenSSL engine to use for signing',
+ config_key = 'UKI/SigningEngine',
+ ),
+ ConfigItem(
+ '--signtool',
+ choices = ('sbsign', 'pesign'),
+ dest = 'signtool',
+ help = 'whether to use sbsign or pesign. It will also be inferred by the other \
+ parameters given: when using --secureboot-{private-key/certificate}, sbsign \
+ will be used, otherwise pesign will be used',
+ config_key = 'UKI/SecureBootSigningTool',
+ ),
+ ConfigItem(
+ '--secureboot-private-key',
+ dest = 'sb_key',
+ help = 'required by --signtool=sbsign. Path to key file or engine-specific designation for SB signing',
+ config_key = 'UKI/SecureBootPrivateKey',
+ ),
+ ConfigItem(
+ '--secureboot-certificate',
+ dest = 'sb_cert',
+ help = 'required by --signtool=sbsign. sbsign needs a path to certificate file or engine-specific designation for SB signing',
+ config_key = 'UKI/SecureBootCertificate',
+ ),
+ ConfigItem(
+ '--secureboot-certificate-dir',
+ dest = 'sb_certdir',
+ default = '/etc/pki/pesign',
+ help = 'required by --signtool=pesign. Path to nss certificate database directory for PE signing. Default is /etc/pki/pesign',
+ config_key = 'UKI/SecureBootCertificateDir',
+ config_push = ConfigItem.config_set
+ ),
+ ConfigItem(
+ '--secureboot-certificate-name',
+ dest = 'sb_cert_name',
+ help = 'required by --signtool=pesign. pesign needs a certificate nickname of nss certificate database entry to use for PE signing',
+ config_key = 'UKI/SecureBootCertificateName',
+ ),
+ ConfigItem(
+ '--secureboot-certificate-validity',
+ metavar = 'DAYS',
+ type = int,
+ dest = 'sb_cert_validity',
+ default = 365 * 10,
+ help = "period of validity (in days) for a certificate created by 'genkey'",
+ config_key = 'UKI/SecureBootCertificateValidity',
+ config_push = ConfigItem.config_set
+ ),
+
+ ConfigItem(
+ '--sign-kernel',
+ action = argparse.BooleanOptionalAction,
+ help = 'Sign the embedded kernel',
+ config_key = 'UKI/SignKernel',
+ ),
+
+ ConfigItem(
+ '--pcr-private-key',
+ dest = 'pcr_private_keys',
+ metavar = 'PATH',
+ type = pathlib.Path,
+ action = 'append',
+ help = 'private part of the keypair for signing PCR signatures',
+ config_key = 'PCRSignature:/PCRPrivateKey',
+ config_push = ConfigItem.config_set_group,
+ ),
+ ConfigItem(
+ '--pcr-public-key',
+ dest = 'pcr_public_keys',
+ metavar = 'PATH',
+ type = pathlib.Path,
+ action = 'append',
+ help = 'public part of the keypair for signing PCR signatures',
+ config_key = 'PCRSignature:/PCRPublicKey',
+ config_push = ConfigItem.config_set_group,
+ ),
+ ConfigItem(
+ '--phases',
+ dest = 'phase_path_groups',
+ metavar = 'PHASE-PATH…',
+ type = parse_phase_paths,
+ action = 'append',
+ help = 'phase-paths to create signatures for',
+ config_key = 'PCRSignature:/Phases',
+ config_push = ConfigItem.config_set_group,
+ ),
+
+ ConfigItem(
+ '--tools',
+ type = pathlib.Path,
+ action = 'append',
+ help = 'Directories to search for tools (systemd-measure, …)',
+ ),
+
+ ConfigItem(
+ ('--output', '-o'),
+ type = pathlib.Path,
+ help = 'output file path',
+ ),
+
+ ConfigItem(
+ '--measure',
+ action = argparse.BooleanOptionalAction,
+ help = 'print systemd-measure output for the UKI',
+ ),
+
+ ConfigItem(
+ '--json',
+ choices = ('pretty', 'short', 'off'),
+ default = 'off',
+ help = 'generate JSON output',
+ ),
+ ConfigItem(
+ '-j',
+ dest='json',
+ action='store_const',
+ const='pretty',
+ help='equivalent to --json=pretty',
+ ),
+
+ ConfigItem(
+ '--all',
+ help = 'print all sections',
+ action = 'store_true',
+ ),
+]
+
+CONFIGFILE_ITEMS = { item.config_key:item
+ for item in CONFIG_ITEMS
+ if item.config_key }
+
+
+def apply_config(namespace, filename=None):
+ if filename is None:
+ if namespace.config:
+ # Config set by the user, use that.
+ filename = namespace.config
+ print(f'Using config file: {filename}')
+ else:
+ # Try to look for a config file then use the first one found.
+ for config_dir in DEFAULT_CONFIG_DIRS:
+ filename = pathlib.Path(config_dir) / DEFAULT_CONFIG_FILE
+ if filename.is_file():
+ # Found a config file, use it.
+ print(f'Using found config file: {filename}')
+ break
+ else:
+ # No config file specified or found, nothing to do.
+ return
+
+ # Fill in ._groups based on --pcr-public-key=, --pcr-private-key=, and --phases=.
+ assert '_groups' not in namespace
+ n_pcr_priv = len(namespace.pcr_private_keys or ())
+ namespace._groups = list(range(n_pcr_priv)) # pylint: disable=protected-access
+
+ cp = configparser.ConfigParser(
+ comment_prefixes='#',
+ inline_comment_prefixes='#',
+ delimiters='=',
+ empty_lines_in_values=False,
+ interpolation=None,
+ strict=False)
+ # Do not make keys lowercase
+ cp.optionxform = lambda option: option
+
+ # The API is not great.
+ read = cp.read(filename)
+ if not read:
+ raise IOError(f'Failed to read {filename}')
+
+ for section_name, section in cp.items():
+ idx = section_name.find(':')
+ if idx >= 0:
+ section_name, group = section_name[:idx+1], section_name[idx+1:]
+ if not section_name or not group:
+ raise ValueError('Section name components cannot be empty')
+ if ':' in group:
+ raise ValueError('Section name cannot contain more than one ":"')
+ else:
+ group = None
+ for key, value in section.items():
+ if item := CONFIGFILE_ITEMS.get(f'{section_name}/{key}'):
+ item.apply_config(namespace, section_name, group, key, value)
+ else:
+ print(f'Unknown config setting [{section_name}] {key}=')
+
+
+def config_example():
+ prev_section = None
+ for item in CONFIG_ITEMS:
+ section, key, value = item.config_example()
+ if section:
+ if prev_section != section:
+ if prev_section:
+ yield ''
+ yield f'[{section}]'
+ prev_section = section
+ yield f'{key} = {value}'
+
+
+class PagerHelpAction(argparse._HelpAction): # pylint: disable=protected-access
+ def __call__(
+ self,
+ parser: argparse.ArgumentParser,
+ namespace: argparse.Namespace,
+ values: Union[str, Sequence[Any], None] = None,
+ option_string: Optional[str] = None
+ ) -> None:
+ page(parser.format_help(), True)
+ parser.exit()
+
+
+def create_parser():
+ p = argparse.ArgumentParser(
+ description='Build and sign Unified Kernel Images',
+ usage='\n ' + textwrap.dedent('''\
+ ukify {b}build{e} [--linux=LINUX] [--initrd=INITRD] [options…]
+ ukify {b}genkey{e} [options…]
+ ukify {b}inspect{e} FILE… [options…]
+ ''').format(b=Style.bold, e=Style.reset),
+ allow_abbrev=False,
+ add_help=False,
+ epilog='\n '.join(('config file:', *config_example())),
+ formatter_class=argparse.RawDescriptionHelpFormatter,
+ )
+
+ for item in CONFIG_ITEMS:
+ item.add_to(p)
+
+ # Suppress printing of usage synopsis on errors
+ p.error = lambda message: p.exit(2, f'{p.prog}: error: {message}\n')
+
+ # Make --help paged
+ p.add_argument(
+ '-h', '--help',
+ action=PagerHelpAction,
+ help='show this help message and exit',
+ )
+
+ return p
+
+
+def finalize_options(opts):
+ # Figure out which syntax is being used, one of:
+ # ukify verb --arg --arg --arg
+ # ukify linux initrd…
+ if len(opts.positional) >= 1 and opts.positional[0] == 'inspect':
+ opts.verb = opts.positional[0]
+ opts.files = opts.positional[1:]
+ if not opts.files:
+ raise ValueError('file(s) to inspect must be specified')
+ if len(opts.files) > 1 and opts.json != 'off':
+ # We could allow this in the future, but we need to figure out the right structure
+ raise ValueError('JSON output is not allowed with multiple files')
+ elif len(opts.positional) == 1 and opts.positional[0] in VERBS:
+ opts.verb = opts.positional[0]
+ elif opts.linux or opts.initrd:
+ raise ValueError('--linux/--initrd options cannot be used with positional arguments')
+ else:
+ print("Assuming obsolete command line syntax with no verb. Please use 'build'.")
+ if opts.positional:
+ opts.linux = pathlib.Path(opts.positional[0])
+ # If we have initrds from parsing config files, append our positional args at the end
+ opts.initrd = (opts.initrd or []) + [pathlib.Path(arg) for arg in opts.positional[1:]]
+ opts.verb = 'build'
+
+ # Check that --pcr-public-key=, --pcr-private-key=, and --phases=
+ # have either the same number of arguments are are not specified at all.
+ n_pcr_pub = None if opts.pcr_public_keys is None else len(opts.pcr_public_keys)
+ n_pcr_priv = None if opts.pcr_private_keys is None else len(opts.pcr_private_keys)
+ n_phase_path_groups = None if opts.phase_path_groups is None else len(opts.phase_path_groups)
+ if n_pcr_pub is not None and n_pcr_pub != n_pcr_priv:
+ raise ValueError('--pcr-public-key= specifications must match --pcr-private-key=')
+ if n_phase_path_groups is not None and n_phase_path_groups != n_pcr_priv:
+ raise ValueError('--phases= specifications must match --pcr-private-key=')
+
+ if opts.cmdline and opts.cmdline.startswith('@'):
+ opts.cmdline = pathlib.Path(opts.cmdline[1:])
+ elif opts.cmdline:
+ # Drop whitespace from the command line. If we're reading from a file,
+ # we copy the contents verbatim. But configuration specified on the command line
+ # or in the config file may contain additional whitespace that has no meaning.
+ opts.cmdline = ' '.join(opts.cmdline.split())
+
+ if opts.os_release and opts.os_release.startswith('@'):
+ opts.os_release = pathlib.Path(opts.os_release[1:])
+ elif not opts.os_release and opts.linux:
+ p = pathlib.Path('/etc/os-release')
+ if not p.exists():
+ p = pathlib.Path('/usr/lib/os-release')
+ opts.os_release = p
+
+ if opts.efi_arch is None:
+ opts.efi_arch = guess_efi_arch()
+
+ if opts.stub is None:
+ if opts.linux is not None:
+ opts.stub = pathlib.Path(f'/usr/lib/systemd/boot/efi/linux{opts.efi_arch}.efi.stub')
+ else:
+ opts.stub = pathlib.Path(f'/usr/lib/systemd/boot/efi/addon{opts.efi_arch}.efi.stub')
+
+ if opts.signing_engine is None:
+ if opts.sb_key:
+ opts.sb_key = pathlib.Path(opts.sb_key)
+ if opts.sb_cert:
+ opts.sb_cert = pathlib.Path(opts.sb_cert)
+
+ if bool(opts.sb_key) ^ bool(opts.sb_cert):
+ # one param only given, sbsign needs both
+ raise ValueError('--secureboot-private-key= and --secureboot-certificate= must be specified together')
+ elif bool(opts.sb_key) and bool(opts.sb_cert):
+ # both param given, infer sbsign and in case it was given, ensure signtool=sbsign
+ if opts.signtool and opts.signtool != 'sbsign':
+ raise ValueError(f'Cannot provide --signtool={opts.signtool} with --secureboot-private-key= and --secureboot-certificate=')
+ opts.signtool = 'sbsign'
+ elif bool(opts.sb_cert_name):
+ # sb_cert_name given, infer pesign and in case it was given, ensure signtool=pesign
+ if opts.signtool and opts.signtool != 'pesign':
+ raise ValueError(f'Cannot provide --signtool={opts.signtool} with --secureboot-certificate-name=')
+ opts.signtool = 'pesign'
+
+ if opts.sign_kernel and not opts.sb_key and not opts.sb_cert_name:
+ raise ValueError('--sign-kernel requires either --secureboot-private-key= and --secureboot-certificate= (for sbsign) or --secureboot-certificate-name= (for pesign) to be specified')
+
+ if opts.verb == 'build' and opts.output is None:
+ if opts.linux is None:
+ raise ValueError('--output= must be specified when building a PE addon')
+ suffix = '.efi' if opts.sb_key or opts.sb_cert_name else '.unsigned.efi'
+ opts.output = opts.linux.name + suffix
+
+ # Now that we know if we're inputting or outputting, really parse section config
+ f = Section.parse_output if opts.verb == 'inspect' else Section.parse_input
+ opts.sections = [f(s) for s in opts.sections]
+ # A convenience dictionary to make it easy to look up sections
+ opts.sections_by_name = {s.name:s for s in opts.sections}
+
+ if opts.summary:
+ # TODO: replace pprint() with some fancy formatting.
+ pprint.pprint(vars(opts))
+ sys.exit()
+
+
+def parse_args(args=None):
+ opts = create_parser().parse_args(args)
+ apply_config(opts)
+ finalize_options(opts)
+ return opts
+
+
+def main():
+ opts = parse_args()
+ if opts.verb == 'build':
+ check_inputs(opts)
+ make_uki(opts)
+ elif opts.verb == 'genkey':
+ check_cert_and_keys_nonexistent(opts)
+ generate_keys(opts)
+ elif opts.verb == 'inspect':
+ inspect_sections(opts)
+ else:
+ assert False
+
+
+if __name__ == '__main__':
+ main()