[PATCH 11/13] test/py: efi_secboot: add a test against certificate revocation

AKASHI Takahiro
2020-05-29T06:41:28Z

Revocation database (dbx) may have not only certificates, but also
message digests of certificates with revocation time
(EFI_CERT_X509_SHA256_GUILD).

In this test case, if the database has such a digest and if the value
matches to a certificate that created a given image's signature,
authentication should fail.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
test/py/tests/test_efi_secboot/conftest.py | 6 ++++-
test/py/tests/test_efi_secboot/test_signed.py | 26 +++++++++++++++++++
2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
index 5d99b8b7189e..13687a2da1a6 100644
--- a/test/py/tests/test_efi_secboot/conftest.py
+++ b/test/py/tests/test_efi_secboot/conftest.py
@@ -103,12 +103,16 @@ def efi_boot_env(request, u_boot_config):
## db1-update
check_call('cd %s; %ssign-efi-sig-list -a -c KEK.crt -k KEK.key db db1.esl db1-update.auth'
% (mnt_point, EFITOOLS_PATH), shell=True)
- ## dbx
+ ## dbx (TEST_dbx certificate)
check_call('cd %s; openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_dbx/ -keyout dbx.key -out dbx.crt -nodes -days 365'
% mnt_point, shell=True)
check_call('cd %s; %scert-to-efi-sig-list -g %s dbx.crt dbx.esl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx dbx.esl dbx.auth'
% (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
shell=True)
+ ## dbx_hash (digest of TEST_db certificate)
+ check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db.crt dbx_hash.crl; %ssign-efi-sig-list -c KEK.crt -k KEK.key dbx dbx_hash.crl dbx_hash.auth'
+ % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
+ shell=True)

# Copy image
check_call('cp %s %s' % (HELLO_PATH, mnt_point), 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 5267b7ab4e86..21ae2bc5ed48 100644
--- a/test/py/tests/test_efi_secboot/test_signed.py
+++ b/test/py/tests/test_efi_secboot/test_signed.py
@@ -121,3 +121,29 @@ 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_auth4(self, u_boot_console, efi_boot_env):
+ """
+ Test Case 4 - revoked by dbx (digest of TEST_db certificate in dbx)
+ """
+ u_boot_console.restart_uboot()
+ disk_img = efi_boot_env
+ with u_boot_console.log.section('Test Case 4'):
+ # Test Case 4, rejected by dbx
+ output = u_boot_console.run_command_list([
+ 'host bind 0 %s' % disk_img,
+ 'fatload host 0:1 4000000 dbx_hash.auth',
+ 'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
+ 'fatload host 0:1 4000000 db.auth',
+ 'setenv -e -nv -bs -rt -at -i 4000000,$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(not 'Failed to set EFI variable' 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',
+ 'efidebug test bootmgr'])
+ assert('\'HELLO\' failed' in ''.join(output))
+ assert('efi_start_image() returned: 26' in ''.join(output))
--
2.25.2