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https://github.com/AsahiLinux/u-boot
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test/py: efi_secboot: add test for intermediate certificates
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>
This commit is contained in:
AKASHI Takahiro
Heinrich Schuchardt
parent
57be8cdce3
commit
e1174c566a
4 changed files with 305 additions and 0 deletions
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@ -124,3 +124,119 @@ def efi_boot_env(request, u_boot_config):
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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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@ -5,4 +5,10 @@ GUID = '11111111-2222-3333-4444-123456789abc'
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# v1.5.1 or earlier of efitools has a bug in sha256 calculation, and
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# you need build a newer version on your own.
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# The path must terminate with '/'.
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EFITOOLS_PATH = ''
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# "--addcert" option of sbsign must be available, otherwise
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# you need build a newer version on your own.
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# The path must terminate with '/'.
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SBSIGN_PATH = ''
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48
test/py/tests/test_efi_secboot/openssl.cnf
Normal file
48
test/py/tests/test_efi_secboot/openssl.cnf
Normal file
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@ -0,0 +1,48 @@
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[ ca ]
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default_ca = CA_default
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[ CA_default ]
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new_certs_dir = .
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database = ./index.txt
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serial = ./serial
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default_md = sha256
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policy = policy_min
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[ req ]
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distinguished_name = def_distinguished_name
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[def_distinguished_name]
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# Extensions
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# -addext " ... = ..."
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#
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[ v3_ca ]
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# Extensions for a typical Root CA.
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basicConstraints = critical,CA:TRUE
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keyUsage = critical, digitalSignature, cRLSign, keyCertSign
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid:always,issuer
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[ v3_int_ca ]
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# Extensions for a typical intermediate CA.
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basicConstraints = critical, CA:TRUE
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keyUsage = critical, digitalSignature, cRLSign, keyCertSign
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid:always,issuer
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[ usr_cert ]
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# Extensions for user end certificates.
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basicConstraints = CA:FALSE
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keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment
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extendedKeyUsage = clientAuth, emailProtection
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subjectKeyIdentifier = hash
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authorityKeyIdentifier = keyid,issuer
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[ policy_min ]
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countryName = optional
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stateOrProvinceName = optional
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localityName = optional
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organizationName = optional
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organizationalUnitName = optional
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commonName = supplied
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emailAddress = optional
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135
test/py/tests/test_efi_secboot/test_signed_intca.py
Normal file
135
test/py/tests/test_efi_secboot/test_signed_intca.py
Normal file
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@ -0,0 +1,135 @@
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# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2020, Linaro Limited
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# Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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#
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# U-Boot UEFI: Image Authentication Test (signature with certificates chain)
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"""
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This test verifies image authentication for a signed image which is signed
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by user certificate and contains additional intermediate certificates in its
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signature.
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"""
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import pytest
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@pytest.mark.boardspec('sandbox')
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@pytest.mark.buildconfigspec('efi_secure_boot')
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@pytest.mark.buildconfigspec('cmd_efidebug')
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@pytest.mark.buildconfigspec('cmd_fat')
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@pytest.mark.buildconfigspec('cmd_nvedit_efi')
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@pytest.mark.slow
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class TestEfiSignedImageIntca(object):
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def test_efi_signed_image_intca1(self, u_boot_console, efi_boot_env_intca):
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"""
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Test Case 1 - authenticated by root CA in db
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"""
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u_boot_console.restart_uboot()
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disk_img = efi_boot_env_intca
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with u_boot_console.log.section('Test Case 1a'):
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# Test Case 1a, with no Int CA and not authenticated by root CA
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output = u_boot_console.run_command_list([
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'host bind 0 %s' % disk_img,
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'fatload host 0:1 4000000 db_c.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
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'fatload host 0:1 4000000 KEK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
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'fatload host 0:1 4000000 PK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
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assert 'Failed to set EFI variable' not in ''.join(output)
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output = u_boot_console.run_command_list([
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'efidebug boot add 1 HELLO_a host 0:1 /helloworld.efi.signed_a ""',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert '\'HELLO_a\' failed' in ''.join(output)
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assert 'efi_start_image() returned: 26' in ''.join(output)
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with u_boot_console.log.section('Test Case 1b'):
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# Test Case 1b, signed and authenticated by root CA
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output = u_boot_console.run_command_list([
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'efidebug boot add 2 HELLO_ab host 0:1 /helloworld.efi.signed_ab ""',
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'efidebug boot next 2',
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'bootefi bootmgr'])
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assert 'Hello, world!' in ''.join(output)
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def test_efi_signed_image_intca2(self, u_boot_console, efi_boot_env_intca):
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"""
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Test Case 2 - authenticated by root CA in db
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"""
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u_boot_console.restart_uboot()
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disk_img = efi_boot_env_intca
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with u_boot_console.log.section('Test Case 2a'):
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# Test Case 2a, unsigned and not authenticated by root CA
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output = u_boot_console.run_command_list([
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'host bind 0 %s' % disk_img,
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'fatload host 0:1 4000000 KEK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
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'fatload host 0:1 4000000 PK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
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assert 'Failed to set EFI variable' not in ''.join(output)
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output = u_boot_console.run_command_list([
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'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert '\'HELLO_abc\' failed' in ''.join(output)
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assert 'efi_start_image() returned: 26' in ''.join(output)
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with u_boot_console.log.section('Test Case 2b'):
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# Test Case 2b, signed and authenticated by root CA
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output = u_boot_console.run_command_list([
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'fatload host 0:1 4000000 db_b.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert '\'HELLO_abc\' failed' in ''.join(output)
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assert 'efi_start_image() returned: 26' in ''.join(output)
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with u_boot_console.log.section('Test Case 2c'):
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# Test Case 2c, signed and authenticated by root CA
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output = u_boot_console.run_command_list([
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'fatload host 0:1 4000000 db_c.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert 'Hello, world!' in ''.join(output)
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def test_efi_signed_image_intca3(self, u_boot_console, efi_boot_env_intca):
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"""
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Test Case 3 - revoked by dbx
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"""
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u_boot_console.restart_uboot()
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disk_img = efi_boot_env_intca
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with u_boot_console.log.section('Test Case 3a'):
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# Test Case 3a, revoked by int CA in dbx
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output = u_boot_console.run_command_list([
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'host bind 0 %s' % disk_img,
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'fatload host 0:1 4000000 dbx_b.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
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'fatload host 0:1 4000000 db_c.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
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'fatload host 0:1 4000000 KEK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
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'fatload host 0:1 4000000 PK.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
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assert 'Failed to set EFI variable' not in ''.join(output)
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output = u_boot_console.run_command_list([
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'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert 'Hello, world!' in ''.join(output)
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# Or,
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# assert '\'HELLO_abc\' failed' in ''.join(output)
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# assert 'efi_start_image() returned: 26' in ''.join(output)
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with u_boot_console.log.section('Test Case 3b'):
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# Test Case 3b, revoked by root CA in dbx
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output = u_boot_console.run_command_list([
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'fatload host 0:1 4000000 dbx_c.auth',
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'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx',
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'efidebug boot next 1',
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'efidebug test bootmgr'])
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assert '\'HELLO_abc\' failed' in ''.join(output)
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assert 'efi_start_image() returned: 26' in ''.join(output)
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