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https://github.com/brain-hackers/u-boot-brain
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e1174c566a
In this test case, an image may have a signature with additional intermediate certificates. A chain of trust will be followed and all the certificates in the middle of chain must be verified before loading. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
243 lines
13 KiB
Python
243 lines
13 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2019, Linaro Limited
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# Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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import os
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import os.path
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from subprocess import call, check_call, check_output, CalledProcessError
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import pytest
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from defs import *
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#
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# Fixture for UEFI secure boot test
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#
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@pytest.fixture(scope='session')
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def efi_boot_env(request, u_boot_config):
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"""Set up a file system to be used in UEFI secure boot test.
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Args:
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request: Pytest request object.
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u_boot_config: U-boot configuration.
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Return:
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A path to disk image to be used for testing
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"""
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image_path = u_boot_config.persistent_data_dir
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image_path = image_path + '/test_efi_secboot.img'
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try:
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mnt_point = u_boot_config.build_dir + '/mnt_efisecure'
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check_call('rm -rf {}'.format(mnt_point), shell=True)
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check_call('mkdir -p {}'.format(mnt_point), shell=True)
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# suffix
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# *.key: RSA private key in PEM
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# *.crt: X509 certificate (self-signed) in PEM
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# *.esl: signature list
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# *.hash: message digest of image as signature list
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# *.auth: signed signature list in signature database format
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# *.efi: UEFI image
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# *.efi.signed: signed UEFI image
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# Create signature database
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# PK
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_PK/ -keyout PK.key -out PK.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s PK.crt PK.esl; %ssign-efi-sig-list -t "2020-04-01" -c PK.crt -k PK.key PK PK.esl PK.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# PK_null for deletion
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check_call('cd %s; touch PK_null.esl; %ssign-efi-sig-list -t "2020-04-02" -c PK.crt -k PK.key PK PK_null.esl PK_null.auth'
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% (mnt_point, EFITOOLS_PATH), shell=True)
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# KEK
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_KEK/ -keyout KEK.key -out KEK.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s KEK.crt KEK.esl; %ssign-efi-sig-list -t "2020-04-03" -c PK.crt -k PK.key KEK KEK.esl KEK.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# db
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_db/ -keyout db.key -out db.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s db.crt db.esl; %ssign-efi-sig-list -t "2020-04-04" -c KEK.crt -k KEK.key db db.esl db.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# db1
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_db1/ -keyout db1.key -out db1.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s db1.crt db1.esl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key db db1.esl db1.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# db1-update
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check_call('cd %s; %ssign-efi-sig-list -t "2020-04-06" -a -c KEK.crt -k KEK.key db db1.esl db1-update.auth'
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% (mnt_point, EFITOOLS_PATH), shell=True)
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# dbx (TEST_dbx certificate)
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_dbx/ -keyout dbx.key -out dbx.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s dbx.crt dbx.esl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx dbx.esl dbx.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# dbx_hash (digest of TEST_db certificate)
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check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db.crt dbx_hash.crl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx dbx_hash.crl dbx_hash.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# dbx_hash1 (digest of TEST_db1 certificate)
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check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db1.crt dbx_hash1.crl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx dbx_hash1.crl dbx_hash1.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# dbx_db (with TEST_db certificate)
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check_call('cd %s; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx db.esl dbx_db.auth'
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% (mnt_point, EFITOOLS_PATH),
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shell=True)
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# Copy image
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check_call('cp %s/lib/efi_loader/helloworld.efi %s' %
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(u_boot_config.build_dir, mnt_point), shell=True)
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# Sign image
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check_call('cd %s; sbsign --key db.key --cert db.crt helloworld.efi'
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% mnt_point, shell=True)
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# Sign already-signed image with another key
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check_call('cd %s; sbsign --key db1.key --cert db1.crt --output helloworld.efi.signed_2sigs helloworld.efi.signed'
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% mnt_point, shell=True)
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# Digest image
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check_call('cd %s; %shash-to-efi-sig-list helloworld.efi db_hello.hash; %ssign-efi-sig-list -t "2020-04-07" -c KEK.crt -k KEK.key db db_hello.hash db_hello.auth'
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% (mnt_point, EFITOOLS_PATH, EFITOOLS_PATH),
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shell=True)
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check_call('cd %s; %shash-to-efi-sig-list helloworld.efi.signed db_hello_signed.hash; %ssign-efi-sig-list -t "2020-04-03" -c KEK.crt -k KEK.key db db_hello_signed.hash db_hello_signed.auth'
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% (mnt_point, EFITOOLS_PATH, EFITOOLS_PATH),
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shell=True)
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check_call('cd %s; %ssign-efi-sig-list -t "2020-04-07" -c KEK.crt -k KEK.key dbx db_hello_signed.hash dbx_hello_signed.auth'
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% (mnt_point, EFITOOLS_PATH),
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shell=True)
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check_call('virt-make-fs --partition=gpt --size=+1M --type=vfat {} {}'.format(
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mnt_point, image_path), shell=True)
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check_call('rm -rf {}'.format(mnt_point), shell=True)
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except CalledProcessError as exception:
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pytest.skip('Setup failed: %s' % exception.cmd)
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return
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else:
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yield image_path
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finally:
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call('rm -f %s' % image_path, shell=True)
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#
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# Fixture for UEFI secure boot test of intermediate certificates
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#
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@pytest.fixture(scope='session')
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def efi_boot_env_intca(request, u_boot_config):
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"""Set up a file system to be used in UEFI secure boot test
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of intermediate certificates.
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Args:
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request: Pytest request object.
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u_boot_config: U-boot configuration.
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Return:
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A path to disk image to be used for testing
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"""
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image_path = u_boot_config.persistent_data_dir
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image_path = image_path + '/test_efi_secboot_intca.img'
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try:
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mnt_point = u_boot_config.persistent_data_dir + '/mnt_efi_secboot_intca'
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check_call('rm -rf {}'.format(mnt_point), shell=True)
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check_call('mkdir -p {}'.format(mnt_point), shell=True)
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# Create signature database
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# PK
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_PK/ -keyout PK.key -out PK.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s PK.crt PK.esl; %ssign-efi-sig-list -c PK.crt -k PK.key PK PK.esl PK.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# KEK
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check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_KEK/ -keyout KEK.key -out KEK.crt -nodes -days 365'
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% mnt_point, shell=True)
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check_call('cd %s; %scert-to-efi-sig-list -g %s KEK.crt KEK.esl; %ssign-efi-sig-list -c PK.crt -k PK.key KEK KEK.esl KEK.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# We will have three-tier hierarchy of certificates:
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# TestRoot: Root CA (self-signed)
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# TestSub: Intermediate CA (signed by Root CA)
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# TestCert: User certificate (signed by Intermediate CA, and used
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# for signing an image)
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#
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# NOTE:
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# I consulted the following EDK2 document for certificate options:
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# BaseTools/Source/Python/Pkcs7Sign/Readme.md
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# Please not use them as they are in product system. They are
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# for test purpose only.
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# TestRoot
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check_call('cp %s/test/py/tests/test_efi_secboot/openssl.cnf %s'
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% (u_boot_config.source_dir, mnt_point), shell=True)
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check_call('cd %s; export OPENSSL_CONF=./openssl.cnf; openssl genrsa -out TestRoot.key 2048; openssl req -extensions v3_ca -new -x509 -days 365 -key TestRoot.key -out TestRoot.crt -subj "/CN=TEST_root/"; touch index.txt; touch index.txt.attr'
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% mnt_point, shell=True)
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# TestSub
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check_call('cd %s; touch serial.new; export OPENSSL_CONF=./openssl.cnf; openssl genrsa -out TestSub.key 2048; openssl req -new -key TestSub.key -out TestSub.csr -subj "/CN=TEST_sub/"; openssl ca -in TestSub.csr -out TestSub.crt -extensions v3_int_ca -days 365 -batch -rand_serial -cert TestRoot.crt -keyfile TestRoot.key'
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% mnt_point, shell=True)
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# TestCert
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check_call('cd %s; touch serial.new; export OPENSSL_CONF=./openssl.cnf; openssl genrsa -out TestCert.key 2048; openssl req -new -key TestCert.key -out TestCert.csr -subj "/CN=TEST_cert/"; openssl ca -in TestCert.csr -out TestCert.crt -extensions usr_cert -days 365 -batch -rand_serial -cert TestSub.crt -keyfile TestSub.key'
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% mnt_point, shell=True)
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# db
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# for TestCert
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check_call('cd %s; %scert-to-efi-sig-list -g %s TestCert.crt TestCert.esl; %ssign-efi-sig-list -c KEK.crt -k KEK.key db TestCert.esl db_a.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# for TestSub
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check_call('cd %s; %scert-to-efi-sig-list -g %s TestSub.crt TestSub.esl; %ssign-efi-sig-list -t "2020-07-16" -c KEK.crt -k KEK.key db TestSub.esl db_b.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# for TestRoot
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check_call('cd %s; %scert-to-efi-sig-list -g %s TestRoot.crt TestRoot.esl; %ssign-efi-sig-list -t "2020-07-17" -c KEK.crt -k KEK.key db TestRoot.esl db_c.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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## dbx (hash of certificate with revocation time)
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# for TestCert
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check_call('cd %s; %scert-to-efi-hash-list -g %s -t "2020-07-20" -s 256 TestCert.crt TestCert.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx TestCert.crl dbx_a.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# for TestSub
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check_call('cd %s; %scert-to-efi-hash-list -g %s -t "2020-07-21" -s 256 TestSub.crt TestSub.crl; %ssign-efi-sig-list -t "2020-07-18" -c KEK.crt -k KEK.key dbx TestSub.crl dbx_b.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# for TestRoot
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check_call('cd %s; %scert-to-efi-hash-list -g %s -t "2020-07-22" -s 256 TestRoot.crt TestRoot.crl; %ssign-efi-sig-list -t "2020-07-19" -c KEK.crt -k KEK.key dbx TestRoot.crl dbx_c.auth'
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% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
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shell=True)
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# Sign image
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# additional intermediate certificates may be included
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# in SignedData
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check_call('cp %s/lib/efi_loader/helloworld.efi %s' %
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(u_boot_config.build_dir, mnt_point), shell=True)
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# signed by TestCert
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check_call('cd %s; %ssbsign --key TestCert.key --cert TestCert.crt --out helloworld.efi.signed_a helloworld.efi'
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% (mnt_point, SBSIGN_PATH), shell=True)
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# signed by TestCert with TestSub in signature
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check_call('cd %s; %ssbsign --key TestCert.key --cert TestCert.crt --addcert TestSub.crt --out helloworld.efi.signed_ab helloworld.efi'
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% (mnt_point, SBSIGN_PATH), shell=True)
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# signed by TestCert with TestSub and TestRoot in signature
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check_call('cd %s; cat TestSub.crt TestRoot.crt > TestSubRoot.crt; %ssbsign --key TestCert.key --cert TestCert.crt --addcert TestSubRoot.crt --out helloworld.efi.signed_abc helloworld.efi'
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% (mnt_point, SBSIGN_PATH), shell=True)
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check_call('virt-make-fs --partition=gpt --size=+1M --type=vfat {} {}'.format(mnt_point, image_path), shell=True)
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check_call('rm -rf {}'.format(mnt_point), shell=True)
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except CalledProcessError as e:
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pytest.skip('Setup failed: %s' % e.cmd)
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return
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else:
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yield image_path
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finally:
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call('rm -f %s' % image_path, shell=True)
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