[PATCH v3 13/13] test/py: efi_secboot: add a test for verifying with digest of signed image

[Heinrich Schuchardt]

On 7/8/20 7:02 AM, AKASHI Takahiro wrote:
> Signature database (db or dbx) may have not only certificates that contain
> a public key for RSA decryption, but also digests of signed images.
>
> In this test case, if database has an image's digest (EFI_CERT_SHA256_GUID)
> and if the value matches to a hash value calculated from image's binary,
> authentication should pass in case of db, and fail in case of dbx.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
>  test/py/tests/test_efi_secboot/conftest.py    | 10 ++++
>  test/py/tests/test_efi_secboot/test_signed.py | 49 +++++++++++++++++++
>  2 files changed, 59 insertions(+)
>
> diff --git a/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
> index c7da1a6e29a3..553550ee02b1 100644
> --- a/test/py/tests/test_efi_secboot/conftest.py
> +++ b/test/py/tests/test_efi_secboot/conftest.py
> @@ -120,6 +120,10 @@ def efi_boot_env(request, u_boot_config):
>          check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db1.crt dbx_hash1.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx dbx_hash1.crl dbx_hash1.auth'
>                     % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
>                     shell=True)
> +        ## dbx_db (with TEST_db certificate)
> +        check_call('cd %s; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx db.esl dbx_db.auth'
> +                   % (mnt_point, EFITOOLS_PATH),
> +                   shell=True)
>
>          # Copy image
>          check_call('cp %s %s' % (HELLO_PATH, mnt_point), shell=True)
> @@ -134,6 +138,12 @@ def efi_boot_env(request, u_boot_config):
>          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'
>                     % (mnt_point, EFITOOLS_PATH, EFITOOLS_PATH),
>                     shell=True)
> +        check_call('cd %s; %shash-to-efi-sig-list helloworld.efi.signed db_hello_signed.hash; %ssign-efi-sig-list -c KEK.crt -k KEK.key db db_hello_signed.hash db_hello_signed.auth'
> +                   % (mnt_point, EFITOOLS_PATH, EFITOOLS_PATH),
> +                   shell=True)
> +        check_call('cd %s; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx db_hello_signed.hash dbx_hello_signed.auth'
> +                   % (mnt_point, EFITOOLS_PATH),
> +                   shell=True)
>
>          check_call('sudo umount %s' % loop_dev, shell=True)
>          check_call('sudo losetup -d %s' % loop_dev, shell=True)
> diff --git a/test/py/tests/test_efi_secboot/test_signed.py b/test/py/tests/test_efi_secboot/test_signed.py
> index 1a31a57e12c2..7531bbac6a5f 100644
> --- a/test/py/tests/test_efi_secboot/test_signed.py
> +++ b/test/py/tests/test_efi_secboot/test_signed.py
> @@ -198,3 +198,52 @@ class TestEfiSignedImage(object):
>                  'efidebug test bootmgr'])
>              assert '\'HELLO\' failed' in ''.join(output)
>              assert 'efi_start_image() returned: 26' in ''.join(output)
> +
> +    def test_efi_signed_image_auth6(self, u_boot_console, efi_boot_env):
> +        """
> +        Test Case 6 - using digest of signed image in database
> +        """
> +        u_boot_console.restart_uboot()
> +        disk_img = efi_boot_env
> +        with u_boot_console.log.section('Test Case 6a'):
> +            # Test Case 6a, verified by image's digest in db
> +            output = u_boot_console.run_command_list([
> +                'host bind 0 %s' % disk_img,
> +                'fatload host 0:1 4000000 db_hello_signed.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,$filesize PK'])
> +            assert 'Failed to set EFI variable' not in ''.join(output)
> +            output = u_boot_console.run_command_list([
> +                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
> +                'efidebug boot next 1',
> +                'bootefi bootmgr'])
> +            assert 'Hello, world!' in ''.join(output)
> +
> +        with u_boot_console.log.section('Test Case 6b'):
> +            # Test Case 6b, rejected by TEST_db certificate in dbx
> +            output = u_boot_console.run_command_list([
> +                'fatload host 0:1 4000000 dbx_db.auth',
> +                'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
> +            assert 'Failed to set EFI variable' not in ''.join(output)
> +            output = u_boot_console.run_command_list([
> +                'efidebug boot next 1',
> +                'efidebug test bootmgr'])
> +            assert '\'HELLO\' failed' in ''.join(output)
> +            assert 'efi_start_image() returned: 26' in ''.join(output)
> +
> +        with u_boot_console.log.section('Test Case 6c'):
> +            # Test Case 6c, rejected by image's digest in dbx
> +            output = u_boot_console.run_command_list([
> +                'fatload host 0:1 4000000 db.auth',
> +                'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
> +                'fatload host 0:1 4000000 dbx_hello_signed.auth',
> +                'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
> +            assert 'Failed to set EFI variable' not in ''.join(output)
> +            output = u_boot_console.run_command_list([
> +                'efidebug boot next 1',
> +                'efidebug test bootmgr'])
> +            assert '\'HELLO\' failed' in ''.join(output)
> +            assert 'efi_start_image() returned: 26' in ''.join(output)
>

This test fails due to not set time stamps for the *.auth files.

The timestamp in dbx_hello_signed.auth must be newer then dbx_db.auth.

db_hello_signed.auth must be older then db.auth.

I will add the missing time stamps.

Best regards

Heinrich