[PATCH v2 8/8] test/py: efi_secboot: add test for intermediate certificates
AKASHI Takahiro
takahiro.akashi at linaro.org
Wed Jul 8 08:39:31 CEST 2020
On Tue, Jul 07, 2020 at 12:42:35PM +0200, Heinrich Schuchardt wrote:
> On 16.06.20 07:26, AKASHI Takahiro wrote:
> > 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 at linaro.org>
> > ---
> > test/py/tests/test_efi_secboot/conftest.py | 138 +++++++++++++++++-
> > test/py/tests/test_efi_secboot/defs.py | 11 +-
> > test/py/tests/test_efi_secboot/openssl.cnf | 48 ++++++
> > .../test_efi_secboot/test_signed_intca.py | 134 +++++++++++++++++
> > 4 files changed, 328 insertions(+), 3 deletions(-)
> > create mode 100644 test/py/tests/test_efi_secboot/openssl.cnf
> > create mode 100644 test/py/tests/test_efi_secboot/test_signed_intca.py
> >
> > diff --git a/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
> > index 34abcd79ae00..e5ac2a2a21b7 100644
> > --- a/test/py/tests/test_efi_secboot/conftest.py
> > +++ b/test/py/tests/test_efi_secboot/conftest.py
> > @@ -37,7 +37,7 @@ def efi_boot_env(request, u_boot_config):
> > global HELLO_PATH
> >
> > image_path = u_boot_config.persistent_data_dir
> > - image_path = image_path + '/' + EFI_SECBOOT_IMAGE_NAME
> > + image_path = image_path + '/' + EFI_SECBOOT_IMAGE_NAME + '.img'
> > image_size = EFI_SECBOOT_IMAGE_SIZE
> > part_size = EFI_SECBOOT_PART_SIZE
> > fs_type = EFI_SECBOOT_FS_TYPE
> > @@ -46,7 +46,7 @@ def efi_boot_env(request, u_boot_config):
> > HELLO_PATH = u_boot_config.build_dir + '/lib/efi_loader/helloworld.efi'
> >
> > try:
> > - mnt_point = u_boot_config.persistent_data_dir + '/mnt_efisecure'
> > + mnt_point = u_boot_config.persistent_data_dir + MNTPNT
> > check_call('mkdir -p {}'.format(mnt_point), shell=True)
> >
> > # create a disk/partition
> > @@ -170,3 +170,137 @@ def efi_boot_env(request, u_boot_config):
> > yield image_path
> > finally:
> > call('rm -f %s' % image_path, shell=True)
> > +
> > +#
> > +# Fixture for UEFI secure boot test of intermediate certificates
>
> Thanks for adding a test.
>
>
> > +#
> > + at pytest.fixture(scope='session')
> > +def efi_boot_env_intca(request, u_boot_config):
> > + """Set up a file system to be used in UEFI secure boot test
> > + of intermediate certificates.
> > +
> > + Args:
> > + request: Pytest request object.
> > + u_boot_config: U-boot configuration.
> > +
> > + Return:
> > + A path to disk image to be used for testing
> > + """
> > + global HELLO_PATH
> > +
> > + image_path = u_boot_config.persistent_data_dir
> > + image_path = image_path + '/' + EFI_SECBOOT_IMAGE_NAME + '_intca.img'
> > + image_size = EFI_SECBOOT_IMAGE_SIZE
> > + part_size = EFI_SECBOOT_PART_SIZE
> > + fs_type = EFI_SECBOOT_FS_TYPE
> > +
> > + if HELLO_PATH == '':
> > + HELLO_PATH = u_boot_config.build_dir + '/lib/efi_loader/helloworld.efi'
> > +
> > + try:
> > + mnt_point = u_boot_config.persistent_data_dir + MNTPNT
> > + check_call('mkdir -p {}'.format(mnt_point), shell=True)
> > +
> > + # create a disk/partition
> > + check_call('dd if=/dev/zero of=%s bs=1MiB count=%d'
> > + % (image_path, image_size), shell=True)
> > + check_call('sgdisk %s -n 1:0:+%dMiB'
> > + % (image_path, part_size), shell=True)
> > + # create a file system
> > + check_call('dd if=/dev/zero of=%s.tmp bs=1MiB count=%d'
> > + % (image_path, part_size), shell=True)
> > + check_call('mkfs -t %s %s.tmp' % (fs_type, image_path), shell=True)
> > + check_call('dd if=%s.tmp of=%s bs=1MiB seek=1 count=%d conv=notrunc'
> > + % (image_path, image_path, 1), shell=True)
> > + check_call('rm %s.tmp' % image_path, shell=True)
> > + loop_dev = check_output('sudo losetup -o 1MiB --sizelimit %dMiB --show -f %s | tr -d "\n"'
> > + % (part_size, image_path), shell=True).decode()
> > + check_output('sudo mount -t %s -o umask=000 %s %s'
> > + % (fs_type, loop_dev, mnt_point), shell=True)
>
> Can we use virt-make-fs to avoid sudo, please. Package libguestfs-tools
> has been added to the Docker image for Gitlab recently.
I will check.
> > +
> > + # Create signature database
> > + ## PK
> > + check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_PK/ -keyout PK.key -out PK.crt -nodes -days 365'
> > + % mnt_point, shell=True)
> > + 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'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + ## KEK
> > + check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_KEK/ -keyout KEK.key -out KEK.crt -nodes -days 365'
> > + % mnt_point, shell=True)
> > + 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'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > +
> > + # We will have three-tier hierarchy of certificates:
> > + # TestRoot: Root CA (self-signed)
> > + # TestSub: Intermediate CA (signed by Root CA)
> > + # TestCert: User certificate (signed by Intermediate CA, and used
> > + # for signing an image)
> > + #
> > + # NOTE:
> > + # I consulted the following EDK2 document for certificate options:
> > + # BaseTools/Source/Python/Pkcs7Sign/Readme.md
> > + # Please not use them as they are in product system. They are
> > + # for test purpose only.
> > +
> > + # TestRoot
> > + check_call('cp %s/test/py/tests/test_efi_secboot/openssl.cnf %s' % (u_boot_config.source_dir, mnt_point), shell=True)
> > + check_call('cd %s; openssl genrsa -out TestRoot.key 2048; openssl req --config openssl.cnf -extensions v3_ca -new -x509 -days 365 -key TestRoot.key -out TestRoot.crt -subj "/CN=TEST_root/"; touch index.txt' % mnt_point, shell=True)
>
> Please, use the .format() function of the string class.
See my previous comment.
-Takahiro Akashi
>
> Best regards
>
> Heinrich
>
> > + # TestSub
> > + check_call('cd %s; openssl genrsa -out TestSub.key 2048; openssl req -new -key TestSub.key -out TestSub.csr -subj "/CN=TEST_sub/"; openssl ca --config openssl.cnf -in TestSub.csr -out TestSub.crt -extensions v3_int_ca -days 365 -batch -rand_serial -cert TestRoot.crt -keyfile TestRoot.key' % mnt_point, shell=True)
> > + # TestCert
> > + check_call('cd %s; openssl genrsa -out TestCert.key 2048; openssl req -new -key TestCert.key -out TestCert.csr -subj "/CN=TEST_cert/"; openssl ca --config openssl.cnf -in TestCert.csr -out TestCert.crt -extensions usr_cert -days 365 -batch -rand_serial -cert TestSub.crt -keyfile TestSub.key' % mnt_point, shell=True)
> > + ## db
> > + # for TestCert
> > + 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'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + # for TestSub
> > + check_call('cd %s; %scert-to-efi-sig-list -g %s TestSub.crt TestSub.esl; %ssign-efi-sig-list -c KEK.crt -k KEK.key db TestSub.esl db_b.auth'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + # for TestRoot
> > + check_call('cd %s; %scert-to-efi-sig-list -g %s TestRoot.crt TestRoot.esl; %ssign-efi-sig-list -c KEK.crt -k KEK.key db TestRoot.esl db_c.auth'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + ## dbx (hash of certificate with revocation time)
> > + # for TestCert
> > + check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 TestCert.crt TestCert.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx TestCert.crl dbx_a.auth'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + # for TestSub
> > + check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 TestSub.crt TestSub.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx TestSub.crl dbx_b.auth'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > + # for TestRoot
> > + check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 TestRoot.crt TestRoot.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx TestRoot.crl dbx_c.auth'
> > + % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
> > + shell=True)
> > +
> > + # Sign image
> > + # additional intermediate certificates may be included
> > + # in SignedData
> > +
> > + check_call('cp %s %s' % (HELLO_PATH, mnt_point), shell=True)
> > + ## signed by TestCert
> > + check_call('cd %s; %ssbsign --key TestCert.key --cert TestCert.crt --out helloworld.efi.signed_a helloworld.efi'
> > + % (mnt_point, SBSIGN_PATH), shell=True)
> > + ## signed by TestCert with TestSub in signature
> > + check_call('cd %s; %ssbsign --key TestCert.key --cert TestCert.crt --addcert TestSub.crt --out helloworld.efi.signed_ab helloworld.efi'
> > + % (mnt_point, SBSIGN_PATH), shell=True)
> > + ## signed by TestCert with TestSub and TestRoot in signature
> > + 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'
> > + % (mnt_point, SBSIGN_PATH), shell=True)
> > +
> > + # Clean-up
> > + check_call('sudo umount %s' % loop_dev, shell=True)
> > + check_call('sudo losetup -d %s' % loop_dev, shell=True)
> > +
> > + except CalledProcessError as e:
> > + pytest.skip('Setup failed: %s' % e.cmd)
> > + return
> > + else:
> > + yield image_path
> > + finally:
> > + call('rm -f %s' % image_path, shell=True)
> > diff --git a/test/py/tests/test_efi_secboot/defs.py b/test/py/tests/test_efi_secboot/defs.py
> > index 099f453979ff..c61f69a316f8 100644
> > --- a/test/py/tests/test_efi_secboot/defs.py
> > +++ b/test/py/tests/test_efi_secboot/defs.py
> > @@ -1,7 +1,7 @@
> > # SPDX-License-Identifier: GPL-2.0+
> >
> > # Disk image name
> > -EFI_SECBOOT_IMAGE_NAME = 'test_efi_secboot.img'
> > +EFI_SECBOOT_IMAGE_NAME = 'test_efi_secboot'
> >
> > # Size in MiB
> > EFI_SECBOOT_IMAGE_SIZE = 16
> > @@ -10,12 +10,21 @@ EFI_SECBOOT_PART_SIZE = 8
> > # Partition file system type
> > EFI_SECBOOT_FS_TYPE = 'vfat'
> >
> > +# Mount point
> > +MNTPNT= 'mnt'
> > +
> > # Owner guid
> > GUID = '11111111-2222-3333-4444-123456789abc'
> >
> > # v1.5.1 or earlier of efitools has a bug in sha256 calculation, and
> > # you need build a newer version on your own.
> > +# The path must terminate with '/'.
> > EFITOOLS_PATH = ''
> >
> > +# "--addcert" option of sbsign must be available, otherwise
> > +# you need build a newer version on your own.
> > +# The path must terminate with '/'.
> > +SBSIGN_PATH= '/home/akashi/arm/misc/sbsigntools/src/'
> > +
> > # Hello World application for sandbox
> > HELLO_PATH = ''
> > diff --git a/test/py/tests/test_efi_secboot/openssl.cnf b/test/py/tests/test_efi_secboot/openssl.cnf
> > new file mode 100644
> > index 000000000000..f684f1df7e69
> > --- /dev/null
> > +++ b/test/py/tests/test_efi_secboot/openssl.cnf
> > @@ -0,0 +1,48 @@
> > +[ ca ]
> > +default_ca = CA_default
> > +
> > +[ CA_default ]
> > +new_certs_dir = .
> > +database = ./index.txt
> > +serial = ./serial
> > +default_md = sha256
> > +policy = policy_min
> > +
> > +[ req ]
> > +distinguished_name = def_distinguished_name
> > +
> > +[def_distinguished_name]
> > +
> > +# Extensions
> > +# -addext " ... = ..."
> > +#
> > +[ v3_ca ]
> > + # Extensions for a typical Root CA.
> > + basicConstraints = critical,CA:TRUE
> > + keyUsage = critical, digitalSignature, cRLSign, keyCertSign
> > + subjectKeyIdentifier = hash
> > + authorityKeyIdentifier = keyid:always,issuer
> > +
> > +[ v3_int_ca ]
> > + # Extensions for a typical intermediate CA.
> > + basicConstraints = critical, CA:TRUE
> > + keyUsage = critical, digitalSignature, cRLSign, keyCertSign
> > + subjectKeyIdentifier = hash
> > + authorityKeyIdentifier = keyid:always,issuer
> > +
> > +[ usr_cert ]
> > + # Extensions for user end certificates.
> > + basicConstraints = CA:FALSE
> > + keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment
> > + extendedKeyUsage = clientAuth, emailProtection
> > + subjectKeyIdentifier = hash
> > + authorityKeyIdentifier = keyid,issuer
> > +
> > +[ policy_min ]
> > + countryName = optional
> > + stateOrProvinceName = optional
> > + localityName = optional
> > + organizationName = optional
> > + organizationalUnitName = optional
> > + commonName = supplied
> > + emailAddress = optional
> > diff --git a/test/py/tests/test_efi_secboot/test_signed_intca.py b/test/py/tests/test_efi_secboot/test_signed_intca.py
> > new file mode 100644
> > index 000000000000..80c1917a2cd3
> > --- /dev/null
> > +++ b/test/py/tests/test_efi_secboot/test_signed_intca.py
> > @@ -0,0 +1,134 @@
> > +# SPDX-License-Identifier: GPL-2.0+
> > +# Copyright (c) 2020, Linaro Limited
> > +# Author: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > +#
> > +# U-Boot UEFI: Image Authentication Test (signature with certificates chain)
> > +
> > +"""
> > +This test verifies image authentication for a signed image which is signed
> > +by user certificate and contains additional intermediate certificates in its
> > +signature.
> > +"""
> > +
> > +import pytest
> > +
> > + at pytest.mark.boardspec('sandbox')
> > + at pytest.mark.buildconfigspec('efi_secure_boot')
> > + at pytest.mark.buildconfigspec('cmd_efidebug')
> > + at pytest.mark.buildconfigspec('cmd_fat')
> > + at pytest.mark.buildconfigspec('cmd_nvedit_efi')
> > + at pytest.mark.slow
> > +class TestEfiSignedImageExt(object):
> > + def test_efi_signed_image_ext1(self, u_boot_console, efi_boot_env_intca):
> > + """
> > + Test Case 1 - authenticated by root CA in db
> > + """
> > + u_boot_console.restart_uboot()
> > + disk_img = efi_boot_env_intca
> > + with u_boot_console.log.section('Test Case 1a'):
> > + # Test Case 1a, with no Int CA and not authenticated by root CA
> > + output = u_boot_console.run_command_list([
> > + 'host bind 0 %s' % disk_img,
> > + 'fatload host 0:1 4000000 db_c.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
> > + 'fatload host 0:1 4000000 KEK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
> > + 'fatload host 0:1 4000000 PK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
> > + assert 'Failed to set EFI variable' not in ''.join(output)
> > +
> > + output = u_boot_console.run_command_list([
> > + 'efidebug boot add 1 HELLO_a host 0:1 /helloworld.efi.signed_a ""',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert '\'HELLO_a\' failed' in ''.join(output)
> > + assert 'efi_start_image() returned: 26' in ''.join(output)
> > +
> > + with u_boot_console.log.section('Test Case 1b'):
> > + # Test Case 1b, signed and authenticated by root CA
> > + output = u_boot_console.run_command_list([
> > + 'efidebug boot add 2 HELLO_ab host 0:1 /helloworld.efi.signed_ab ""',
> > + 'efidebug boot next 2',
> > + 'bootefi bootmgr'])
> > + assert 'Hello, world!' in ''.join(output)
> > +
> > + def test_efi_signed_image_ext2(self, u_boot_console, efi_boot_env_intca):
> > + """
> > + Test Case 2 - authenticated by root CA in db
> > + """
> > + u_boot_console.restart_uboot()
> > + disk_img = efi_boot_env_intca
> > + with u_boot_console.log.section('Test Case 2a'):
> > + # Test Case 2a, unsigned and not authenticated by root CA
> > + output = u_boot_console.run_command_list([
> > + 'host bind 0 %s' % disk_img,
> > + 'fatload host 0:1 4000000 KEK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
> > + 'fatload host 0:1 4000000 PK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
> > + assert 'Failed to set EFI variable' not in ''.join(output)
> > +
> > + output = u_boot_console.run_command_list([
> > + 'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert '\'HELLO_abc\' failed' in ''.join(output)
> > + assert 'efi_start_image() returned: 26' in ''.join(output)
> > +
> > + with u_boot_console.log.section('Test Case 2b'):
> > + # Test Case 2b, signed and authenticated by root CA
> > + output = u_boot_console.run_command_list([
> > + 'fatload host 0:1 4000000 db_b.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert '\'HELLO_abc\' failed' in ''.join(output)
> > + assert 'efi_start_image() returned: 26' in ''.join(output)
> > +
> > + with u_boot_console.log.section('Test Case 2c'):
> > + # Test Case 2c, signed and authenticated by root CA
> > + output = u_boot_console.run_command_list([
> > + 'fatload host 0:1 4000000 db_c.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert 'Hello, world!' in ''.join(output)
> > +
> > + def test_efi_signed_image_ext3(self, u_boot_console, efi_boot_env_intca):
> > + """
> > + Test Case 3 - revoked by dbx
> > + """
> > + u_boot_console.restart_uboot()
> > + disk_img = efi_boot_env_intca
> > + with u_boot_console.log.section('Test Case 3a'):
> > + # Test Case 3a, revoked by root CA in dbx
> > + output = u_boot_console.run_command_list([
> > + 'host bind 0 %s' % disk_img,
> > + 'fatload host 0:1 4000000 dbx_c.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
> > + 'fatload host 0:1 4000000 db_c.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
> > + 'fatload host 0:1 4000000 KEK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
> > + 'fatload host 0:1 4000000 PK.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
> > + assert 'Failed to set EFI variable' not in ''.join(output)
> > +
> > + output = u_boot_console.run_command_list([
> > + 'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert '\'HELLO_abc\' failed' in ''.join(output)
> > + assert 'efi_start_image() returned: 26' in ''.join(output)
> > +
> > + with u_boot_console.log.section('Test Case 3b'):
> > + # Test Case 3b, revoked by int CA in dbx
> > + output = u_boot_console.run_command_list([
> > + 'fatload host 0:1 4000000 dbx_b.auth',
> > + 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
> > + 'efidebug boot next 1',
> > + 'efidebug test bootmgr'])
> > + assert 'Hello, world!' in ''.join(output)
> > + # Or,
> > + # assert('\'HELLO_abc\' failed' in ''.join(output))
> > + # assert('efi_start_image() returned: 26' in ''.join(output))
> >
>
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