tests: add pytest tests for ukify

Some gymnastics were needed to import ukify as a module. Before the file
was templated, this was trivial: insert the directory in sys.path, call import.
But it's a real pain to import the unsuffixed file after processing. Instead,
the untemplated file is imported, which works well enough for tests and is
very simple.

The tests can be called via pytest:
  PATH=build/:$PATH pytest -v src/ukify/test/test_ukify.py
or directly:
  PATH=build/:$PATH src/ukify/test/test_ukify.py
or via the meson test machinery output:
  meson test -C build test-ukify -v
or without verbose output:
  meson test -C build test-ukify

Zekret files are obfuscated using base64.

meson.build

@@ -2198,6 +2198,7 @@ subdir('src/test')
 subdir('src/fuzz')
 subdir('rules.d')
 subdir('test')
+subdir('src/ukify/test')  # needs to be last for test_env variable
 
 ############################################################
 

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src/ukify/test/example.signing.key.base64

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src/ukify/test/example.tpm2-pcr-private.pem.base64

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src/ukify/test/example.tpm2-pcr-private2.pem.base64

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src/ukify/test/example.tpm2-pcr-public.pem.base64

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src/ukify/test/example.tpm2-pcr-public2.pem.base64

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src/ukify/test/meson.build

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+if want_ukify and want_tests != 'false'
+   test('test-ukify',
+        files('test_ukify.py'),
+        env : test_env)
+endif

src/ukify/test/setup.cfg

@@ -0,0 +1,2 @@
+[tool:pytest]
+addopts = --flakes

src/ukify/test/test_ukify.py

@@ -0,0 +1,372 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1+
+
+# pylint: disable=missing-docstring,redefined-outer-name,invalid-name
+# pylint: disable=unused-import,import-outside-toplevel,useless-else-on-loop
+# pylint: disable=consider-using-with,wrong-import-position,unspecified-encoding
+
+import base64
+import json
+import os
+import pathlib
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+
+try:
+    import pytest
+except ImportError:
+    sys.exit(77)
+
+# We import ukify.py, which is a template file. But only __version__ is
+# substituted, which we don't care about here. Having the .py suffix makes it
+# easier to import the file.
+sys.path.append(os.path.dirname(__file__) + '/..')
+import ukify
+
+
+def test_guess_efi_arch():
+    arch = ukify.guess_efi_arch()
+    assert arch in ukify.EFI_ARCHES
+
+def test_shell_join():
+    assert ukify.shell_join(['a', 'b', ' ']) == "a b ' '"
+
+def test_round_up():
+    assert ukify.round_up(0) == 0
+    assert ukify.round_up(4095) == 4096
+    assert ukify.round_up(4096) == 4096
+    assert ukify.round_up(4097) == 8192
+
+def test_parse_args_minimal():
+    opts = ukify.parse_args('arg1 arg2'.split())
+    assert opts.linux == pathlib.Path('arg1')
+    assert opts.initrd == pathlib.Path('arg2')
+    assert opts.os_release in (pathlib.Path('/etc/os-release'),
+                               pathlib.Path('/usr/lib/os-release'))
+
+def test_parse_args_many():
+    opts = ukify.parse_args(
+        ['/ARG1', '///ARG2',
+         '--cmdline=a b c',
+         '--os-release=K1=V1\nK2=V2',
+         '--devicetree=DDDDTTTT',
+         '--splash=splash',
+         '--pcrpkey=PATH',
+         '--uname=1.2.3',
+         '--stub=STUBPATH',
+         '--pcr-private-key=PKEY1',
+         '--pcr-public-key=PKEY2',
+         '--pcr-banks=SHA1,SHA256',
+         '--signing-engine=ENGINE',
+         '--secureboot-private-key=SBKEY',
+         '--secureboot-certificate=SBCERT',
+         '--sign-kernel',
+         '--no-sign-kernel',
+         '--tools=TOOLZ///',
+         '--output=OUTPUT',
+         '--measure',
+         '--no-measure',
+         ])
+    assert opts.linux == pathlib.Path('/ARG1')
+    assert opts.initrd == pathlib.Path('/ARG2')
+    assert opts.os_release == 'K1=V1\nK2=V2'
+    assert opts.devicetree == pathlib.Path('DDDDTTTT')
+    assert opts.splash == pathlib.Path('splash')
+    assert opts.pcrpkey == pathlib.Path('PATH')
+    assert opts.uname == '1.2.3'
+    assert opts.stub == pathlib.Path('STUBPATH')
+    assert opts.pcr_private_keys == [pathlib.Path('PKEY1')]
+    assert opts.pcr_public_keys == [pathlib.Path('PKEY2')]
+    assert opts.pcr_banks == ['SHA1', 'SHA256']
+    assert opts.signing_engine == 'ENGINE'
+    assert opts.sb_key == 'SBKEY'
+    assert opts.sb_cert == 'SBCERT'
+    assert opts.sign_kernel is False
+    assert opts.tools == pathlib.Path('TOOLZ/')
+    assert opts.output == pathlib.Path('OUTPUT')
+    assert opts.measure is False
+
+def test_parse_sections():
+    opts = ukify.parse_args(
+        ['/ARG1', '/ARG2',
+         '--section=test:TESTTESTTEST',
+         '--section=test2:@FILE',
+         ])
+
+    assert opts.linux == pathlib.Path('/ARG1')
+    assert opts.initrd == pathlib.Path('/ARG2')
+    assert len(opts.sections) == 2
+
+    assert opts.sections[0].name == 'test'
+    assert isinstance(opts.sections[0].content, pathlib.Path)
+    assert opts.sections[0].tmpfile
+    assert opts.sections[0].offset is None
+    assert opts.sections[0].measure is False
+
+    assert opts.sections[1].name == 'test2'
+    assert opts.sections[1].content == pathlib.Path('FILE')
+    assert opts.sections[1].tmpfile is None
+    assert opts.sections[1].offset is None
+    assert opts.sections[1].measure is False
+
+def test_help(capsys):
+    with pytest.raises(SystemExit):
+        ukify.parse_args(['--help'])
+    out = capsys.readouterr()
+    assert '--section' in out.out
+    assert not out.err
+
+def test_help_error(capsys):
+    with pytest.raises(SystemExit):
+        ukify.parse_args(['a', 'b', '--no-such-option'])
+    out = capsys.readouterr()
+    assert not out.out
+    assert '--no-such-option' in out.err
+    assert len(out.err.splitlines()) == 1
+
+@pytest.fixture(scope='session')
+def kernel_initrd():
+    try:
+        text = subprocess.check_output(['bootctl', 'list', '--json=short'],
+                                       text=True)
+    except subprocess.CalledProcessError:
+        return None
+
+    items = json.loads(text)
+
+    for item in items:
+        try:
+            linux = f"{item['root']}{item['linux']}"
+            initrd = f"{item['root']}{item['initrd'][0]}"
+        except (KeyError, IndexError):
+            pass
+        return [linux, initrd]
+    else:
+        return None
+
+def test_check_splash():
+    try:
+        # pyflakes: noqa
+        import PIL  # noqa
+    except ImportError:
+        pytest.skip('PIL not available')
+
+    with pytest.raises(OSError):
+        ukify.check_splash(os.devnull)
+
+def test_basic_operation(kernel_initrd, tmpdir):
+    if kernel_initrd is None:
+        pytest.skip('linux+initrd not found')
+
+    output = f'{tmpdir}/basic.efi'
+    opts = ukify.parse_args(kernel_initrd + [f'--output={output}'])
+    try:
+        ukify.check_inputs(opts)
+    except OSError as e:
+        pytest.skip(str(e))
+
+    ukify.make_uki(opts)
+
+    # let's check that objdump likes the resulting file
+    subprocess.check_output(['objdump', '-h', output])
+
+def test_sections(kernel_initrd, tmpdir):
+    if kernel_initrd is None:
+        pytest.skip('linux+initrd not found')
+
+    output = f'{tmpdir}/basic.efi'
+    opts = ukify.parse_args([
+        *kernel_initrd,
+        f'--output={output}',
+        '--uname=1.2.3',
+        '--cmdline=ARG1 ARG2 ARG3',
+        '--os-release=K1=V1\nK2=V2\n',
+        '--section=.test:CONTENTZ',
+    ])
+
+    try:
+        ukify.check_inputs(opts)
+    except OSError as e:
+        pytest.skip(str(e))
+
+    ukify.make_uki(opts)
+
+    # let's check that objdump likes the resulting file
+    dump = subprocess.check_output(['objdump', '-h', output], text=True)
+
+    for sect in 'text osrel cmdline linux initrd uname test'.split():
+        assert re.search(fr'^\s*\d+\s+.{sect}\s+0', dump, re.MULTILINE)
+
+
+def unbase64(filename):
+    tmp = tempfile.NamedTemporaryFile()
+    base64.decode(filename.open('rb'), tmp)
+    tmp.flush()
+    return tmp
+
+
+def test_efi_signing(kernel_initrd, tmpdir):
+    if kernel_initrd is None:
+        pytest.skip('linux+initrd not found')
+    if not shutil.which('sbsign'):
+        pytest.skip('sbsign not found')
+
+    ourdir = pathlib.Path(__file__).parent
+    cert = unbase64(ourdir / 'example.signing.crt.base64')
+    key = unbase64(ourdir / 'example.signing.key.base64')
+
+    output = f'{tmpdir}/signed.efi'
+    opts = ukify.parse_args([
+        *kernel_initrd,
+        f'--output={output}',
+        '--uname=1.2.3',
+        '--cmdline=ARG1 ARG2 ARG3',
+        f'--secureboot-certificate={cert.name}',
+        f'--secureboot-private-key={key.name}',
+    ])
+
+    try:
+        ukify.check_inputs(opts)
+    except OSError as e:
+        pytest.skip(str(e))
+
+    ukify.make_uki(opts)
+
+    if shutil.which('sbverify'):
+        # let's check that sbverify likes the resulting file
+        dump = subprocess.check_output([
+            'sbverify',
+            '--cert', cert.name,
+            output,
+        ], text=True)
+
+        assert 'Signature verification OK' in dump
+
+def test_pcr_signing(kernel_initrd, tmpdir):
+    if kernel_initrd is None:
+        pytest.skip('linux+initrd not found')
+    if os.getuid() != 0:
+        pytest.skip('must be root to access tpm2')
+    if subprocess.call(['systemd-creds', 'has-tpm2', '-q']) != 0:
+        pytest.skip('tpm2 is not available')
+
+    ourdir = pathlib.Path(__file__).parent
+    pub = unbase64(ourdir / 'example.tpm2-pcr-public.pem.base64')
+    priv = unbase64(ourdir / 'example.tpm2-pcr-private.pem.base64')
+
+    output = f'{tmpdir}/signed.efi'
+    opts = ukify.parse_args([
+        *kernel_initrd,
+        f'--output={output}',
+        '--uname=1.2.3',
+        '--cmdline=ARG1 ARG2 ARG3',
+        '--os-release=ID=foobar\n',
+        '--pcr-banks=sha1',   # use sha1 as that is most likely to be supported
+        f'--pcrpkey={pub.name}',
+        f'--pcr-public-key={pub.name}',
+        f'--pcr-private-key={priv.name}',
+    ])
+
+    try:
+        ukify.check_inputs(opts)
+    except OSError as e:
+        pytest.skip(str(e))
+
+    ukify.make_uki(opts)
+
+    # let's check that objdump likes the resulting file
+    dump = subprocess.check_output(['objdump', '-h', output], text=True)
+
+    for sect in 'text osrel cmdline linux initrd uname pcrsig'.split():
+        assert re.search(fr'^\s*\d+\s+.{sect}\s+0', dump, re.MULTILINE)
+
+    # objcopy fails when called without an output argument (EPERM).
+    # It also fails when called with /dev/null (file truncated).
+    # It also fails when called with /dev/zero (because it reads the
+    # output file, infinitely in this case.)
+    # So let's just call it with a dummy output argument.
+    subprocess.check_call([
+        'objcopy',
+        *(f'--dump-section=.{n}={tmpdir}/out.{n}' for n in (
+            'pcrpkey', 'pcrsig', 'osrel', 'uname', 'cmdline')),
+        output,
+        tmpdir / 'dummy',
+    ],
+        text=True)
+
+    assert open(tmpdir / 'out.pcrpkey').read() == open(pub.name).read()
+    assert open(tmpdir / 'out.osrel').read() == 'ID=foobar\n'
+    assert open(tmpdir / 'out.uname').read() == '1.2.3'
+    assert open(tmpdir / 'out.cmdline').read() == 'ARG1 ARG2 ARG3'
+    sig = open(tmpdir / 'out.pcrsig').read()
+    sig = json.loads(sig)
+    assert list(sig.keys()) == ['sha1']
+    assert len(sig['sha1']) == 4   # four items for four phases
+
+def test_pcr_signing2(kernel_initrd, tmpdir):
+    if kernel_initrd is None:
+        pytest.skip('linux+initrd not found')
+    if os.getuid() != 0:
+        pytest.skip('must be root to access tpm2')
+    if subprocess.call(['systemd-creds', 'has-tpm2', '-q']) != 0:
+        pytest.skip('tpm2 is not available')
+
+    ourdir = pathlib.Path(__file__).parent
+    pub = unbase64(ourdir / 'example.tpm2-pcr-public.pem.base64')
+    priv = unbase64(ourdir / 'example.tpm2-pcr-private.pem.base64')
+    pub2 = unbase64(ourdir / 'example.tpm2-pcr-public2.pem.base64')
+    priv2 = unbase64(ourdir / 'example.tpm2-pcr-private2.pem.base64')
+
+    output = f'{tmpdir}/signed.efi'
+    opts = ukify.parse_args([
+        *kernel_initrd,
+        f'--output={output}',
+        '--uname=1.2.3',
+        '--cmdline=ARG1 ARG2 ARG3',
+        '--os-release=ID=foobar\n',
+        '--pcr-banks=sha1',   # use sha1 as that is most likely to be supported
+        f'--pcrpkey={pub2.name}',
+        f'--pcr-public-key={pub.name}',
+        f'--pcr-private-key={priv.name}',
+        '--phases=enter-initrd enter-initrd:leave-initrd',
+        f'--pcr-public-key={pub2.name}',
+        f'--pcr-private-key={priv2.name}',
+        '--phases=sysinit ready shutdown final',  # yes, those phase paths are not reachable
+    ])
+
+    try:
+        ukify.check_inputs(opts)
+    except OSError as e:
+        pytest.skip(str(e))
+
+    ukify.make_uki(opts)
+
+    # let's check that objdump likes the resulting file
+    dump = subprocess.check_output(['objdump', '-h', output], text=True)
+
+    for sect in 'text osrel cmdline linux initrd uname pcrsig'.split():
+        assert re.search(fr'^\s*\d+\s+.{sect}\s+0', dump, re.MULTILINE)
+
+    subprocess.check_call([
+        'objcopy',
+        *(f'--dump-section=.{n}={tmpdir}/out.{n}' for n in (
+            'pcrpkey', 'pcrsig', 'osrel', 'uname', 'cmdline')),
+        output,
+        tmpdir / 'dummy',
+    ],
+        text=True)
+
+    assert open(tmpdir / 'out.pcrpkey').read() == open(pub2.name).read()
+    assert open(tmpdir / 'out.osrel').read() == 'ID=foobar\n'
+    assert open(tmpdir / 'out.uname').read() == '1.2.3'
+    assert open(tmpdir / 'out.cmdline').read() == 'ARG1 ARG2 ARG3'
+    sig = open(tmpdir / 'out.pcrsig').read()
+    sig = json.loads(sig)
+    assert list(sig.keys()) == ['sha1']
+    assert len(sig['sha1']) == 6   # six items for six phases paths
+
+if __name__ == '__main__':
+    pytest.main([__file__, '-v'])