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// Copyright 2024, The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! libavb_rs certificate tests.
use crate::{
build_test_ops_one_image_one_vbmeta,
test_data::*,
test_ops::{FakeVbmetaKey, TestOps},
verify_one_image_one_vbmeta,
};
use avb::{
CertPermanentAttributes, SlotVerifyError, CERT_PIK_VERSION_LOCATION, CERT_PSK_VERSION_LOCATION,
};
use hex::decode;
use std::{collections::HashMap, fs};
use zerocopy::FromBytes;
/// Initializes a `TestOps` object such that cert verification will succeed on `TEST_PARTITION_NAME`.
fn build_test_cert_ops_one_image_one_vbmeta<'a>() -> TestOps<'a> {
let mut ops = build_test_ops_one_image_one_vbmeta();
// Replace vbmeta with the cert-signed version.
ops.add_partition("vbmeta", fs::read(TEST_CERT_VBMETA_PATH).unwrap());
// Tell `ops` to use cert APIs and to route the default key through cert validation.
ops.use_cert = true;
ops.default_vbmeta_key = Some(FakeVbmetaKey::Cert);
// Add the libavb_cert permanent attributes.
let perm_attr_bytes = fs::read(TEST_CERT_PERMANENT_ATTRIBUTES_PATH).unwrap();
ops.cert_permanent_attributes =
Some(CertPermanentAttributes::read_from(&perm_attr_bytes[..]).unwrap());
ops.cert_permanent_attributes_hash = Some(
decode(TEST_CERT_PERMANENT_ATTRIBUTES_HASH_HEX)
.unwrap()
.try_into()
.unwrap(),
);
// Add the rollbacks for the cert keys.
ops.rollbacks
.insert(CERT_PIK_VERSION_LOCATION, TEST_CERT_PIK_VERSION);
ops.rollbacks
.insert(CERT_PSK_VERSION_LOCATION, TEST_CERT_PSK_VERSION);
ops
}
#[test]
fn cert_verify_succeeds() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
let result = verify_one_image_one_vbmeta(&mut ops);
assert!(result.is_ok());
}
#[test]
fn cert_verify_sets_key_rollbacks() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
// `cert_key_versions` should start empty and be filled by the `set_key_version()` callback
// during cert key validation.
assert!(ops.cert_key_versions.is_empty());
let result = verify_one_image_one_vbmeta(&mut ops);
assert!(result.is_ok());
assert_eq!(
ops.cert_key_versions,
HashMap::from([
(CERT_PIK_VERSION_LOCATION, TEST_CERT_PIK_VERSION),
(CERT_PSK_VERSION_LOCATION, TEST_CERT_PSK_VERSION)
])
);
}
#[test]
fn cert_verify_fails_with_pik_rollback_violation() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
// If the image is signed with a lower key version than our rollback, it should fail to verify.
*ops.rollbacks.get_mut(&CERT_PIK_VERSION_LOCATION).unwrap() += 1;
let result = verify_one_image_one_vbmeta(&mut ops);
assert_eq!(result.unwrap_err(), SlotVerifyError::PublicKeyRejected);
}
#[test]
fn cert_verify_fails_with_psk_rollback_violation() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
// If the image is signed with a lower key version than our rollback, it should fail to verify.
*ops.rollbacks.get_mut(&CERT_PSK_VERSION_LOCATION).unwrap() += 1;
let result = verify_one_image_one_vbmeta(&mut ops);
assert_eq!(result.unwrap_err(), SlotVerifyError::PublicKeyRejected);
}
#[test]
fn cert_verify_fails_with_wrong_vbmeta_key() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
// The default non-cert vbmeta image should fail to verify.
ops.add_partition("vbmeta", fs::read(TEST_VBMETA_PATH).unwrap());
let result = verify_one_image_one_vbmeta(&mut ops);
assert_eq!(result.unwrap_err(), SlotVerifyError::PublicKeyRejected);
}
#[test]
fn cert_verify_fails_with_bad_permanent_attributes_hash() {
let mut ops = build_test_cert_ops_one_image_one_vbmeta();
// The permanent attributes must match their hash.
ops.cert_permanent_attributes_hash.as_mut().unwrap()[0] ^= 0x01;
let result = verify_one_image_one_vbmeta(&mut ops);
assert_eq!(result.unwrap_err(), SlotVerifyError::PublicKeyRejected);
}
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