Secretkeeper: VTS to use dice_chain as identity
VTS (being the client of Sk) will use dice_chain as the identity.
Consequently we can use the sealing policy constructed out of this
identity & no more need to use HYPOTHETICAL_DICE_POLICY hack.
For sample identity, we create dice_sample module which constructs an
example dice chain (in Explicit key chain format), along with secrets.
Test: Secretkeeper VTS
Bug: 291224769
Change-Id: Ia1d1a92391d3ee455bf9fe254770b4a9bd08cb12
diff --git a/security/secretkeeper/aidl/vts/dice_sample.rs b/security/secretkeeper/aidl/vts/dice_sample.rs
new file mode 100644
index 0000000..db532b1
--- /dev/null
+++ b/security/secretkeeper/aidl/vts/dice_sample.rs
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+//! This module provides a set of sample DICE chains for testing purpose only. Note that this
+//! module duplicates a large chunk of code in libdiced_sample_inputs. We avoid modifying the
+//! latter for testing purposes because it is installed on device.
+
+use ciborium::{de, ser, value::Value};
+use core::ffi::CStr;
+use coset::{iana, Algorithm, AsCborValue, CoseKey, KeyOperation, KeyType, Label};
+use diced_open_dice::{
+ derive_cdi_private_key_seed, keypair_from_seed, retry_bcc_format_config_descriptor,
+ retry_bcc_main_flow, retry_dice_main_flow, Config, DiceArtifacts, DiceConfigValues, DiceError,
+ DiceMode, InputValues, OwnedDiceArtifacts, CDI_SIZE, HASH_SIZE, HIDDEN_SIZE,
+};
+use log::error;
+use secretkeeper_client::dice::OwnedDiceArtifactsWithExplicitKey;
+
+/// Sample UDS used to perform the root DICE flow by `make_sample_bcc_and_cdis`.
+const UDS: &[u8; CDI_SIZE] = &[
+ 0x65, 0x4f, 0xab, 0xa9, 0xa5, 0xad, 0x0f, 0x5e, 0x15, 0xc3, 0x12, 0xf7, 0x77, 0x45, 0xfa, 0x55,
+ 0x18, 0x6a, 0xa6, 0x34, 0xb6, 0x7c, 0x82, 0x7b, 0x89, 0x4c, 0xc5, 0x52, 0xd3, 0x27, 0x35, 0x8e,
+];
+
+const CODE_HASH_ABL: [u8; HASH_SIZE] = [
+ 0x16, 0x48, 0xf2, 0x55, 0x53, 0x23, 0xdd, 0x15, 0x2e, 0x83, 0x38, 0xc3, 0x64, 0x38, 0x63, 0x26,
+ 0x0f, 0xcf, 0x5b, 0xd1, 0x3a, 0xd3, 0x40, 0x3e, 0x23, 0xf8, 0x34, 0x4c, 0x6d, 0xa2, 0xbe, 0x25,
+ 0x1c, 0xb0, 0x29, 0xe8, 0xc3, 0xfb, 0xb8, 0x80, 0xdc, 0xb1, 0xd2, 0xb3, 0x91, 0x4d, 0xd3, 0xfb,
+ 0x01, 0x0f, 0xe4, 0xe9, 0x46, 0xa2, 0xc0, 0x26, 0x57, 0x5a, 0xba, 0x30, 0xf7, 0x15, 0x98, 0x14,
+];
+const AUTHORITY_HASH_ABL: [u8; HASH_SIZE] = [
+ 0xf9, 0x00, 0x9d, 0xc2, 0x59, 0x09, 0xe0, 0xb6, 0x98, 0xbd, 0xe3, 0x97, 0x4a, 0xcb, 0x3c, 0xe7,
+ 0x6b, 0x24, 0xc3, 0xe4, 0x98, 0xdd, 0xa9, 0x6a, 0x41, 0x59, 0x15, 0xb1, 0x23, 0xe6, 0xc8, 0xdf,
+ 0xfb, 0x52, 0xb4, 0x52, 0xc1, 0xb9, 0x61, 0xdd, 0xbc, 0x5b, 0x37, 0x0e, 0x12, 0x12, 0xb2, 0xfd,
+ 0xc1, 0x09, 0xb0, 0xcf, 0x33, 0x81, 0x4c, 0xc6, 0x29, 0x1b, 0x99, 0xea, 0xae, 0xfd, 0xaa, 0x0d,
+];
+const HIDDEN_ABL: [u8; HIDDEN_SIZE] = [
+ 0xa2, 0x01, 0xd0, 0xc0, 0xaa, 0x75, 0x3c, 0x06, 0x43, 0x98, 0x6c, 0xc3, 0x5a, 0xb5, 0x5f, 0x1f,
+ 0x0f, 0x92, 0x44, 0x3b, 0x0e, 0xd4, 0x29, 0x75, 0xe3, 0xdb, 0x36, 0xda, 0xc8, 0x07, 0x97, 0x4d,
+ 0xff, 0xbc, 0x6a, 0xa4, 0x8a, 0xef, 0xc4, 0x7f, 0xf8, 0x61, 0x7d, 0x51, 0x4d, 0x2f, 0xdf, 0x7e,
+ 0x8c, 0x3d, 0xa3, 0xfc, 0x63, 0xd4, 0xd4, 0x74, 0x8a, 0xc4, 0x14, 0x45, 0x83, 0x6b, 0x12, 0x7e,
+];
+const CODE_HASH_AVB: [u8; HASH_SIZE] = [
+ 0xa4, 0x0c, 0xcb, 0xc1, 0xbf, 0xfa, 0xcc, 0xfd, 0xeb, 0xf4, 0xfc, 0x43, 0x83, 0x7f, 0x46, 0x8d,
+ 0xd8, 0xd8, 0x14, 0xc1, 0x96, 0x14, 0x1f, 0x6e, 0xb3, 0xa0, 0xd9, 0x56, 0xb3, 0xbf, 0x2f, 0xfa,
+ 0x88, 0x70, 0x11, 0x07, 0x39, 0xa4, 0xd2, 0xa9, 0x6b, 0x18, 0x28, 0xe8, 0x29, 0x20, 0x49, 0x0f,
+ 0xbb, 0x8d, 0x08, 0x8c, 0xc6, 0x54, 0xe9, 0x71, 0xd2, 0x7e, 0xa4, 0xfe, 0x58, 0x7f, 0xd3, 0xc7,
+];
+const AUTHORITY_HASH_AVB: [u8; HASH_SIZE] = [
+ 0xb2, 0x69, 0x05, 0x48, 0x56, 0xb5, 0xfa, 0x55, 0x6f, 0xac, 0x56, 0xd9, 0x02, 0x35, 0x2b, 0xaa,
+ 0x4c, 0xba, 0x28, 0xdd, 0x82, 0x3a, 0x86, 0xf5, 0xd4, 0xc2, 0xf1, 0xf9, 0x35, 0x7d, 0xe4, 0x43,
+ 0x13, 0xbf, 0xfe, 0xd3, 0x36, 0xd8, 0x1c, 0x12, 0x78, 0x5c, 0x9c, 0x3e, 0xf6, 0x66, 0xef, 0xab,
+ 0x3d, 0x0f, 0x89, 0xa4, 0x6f, 0xc9, 0x72, 0xee, 0x73, 0x43, 0x02, 0x8a, 0xef, 0xbc, 0x05, 0x98,
+];
+const HIDDEN_AVB: [u8; HIDDEN_SIZE] = [
+ 0x5b, 0x3f, 0xc9, 0x6b, 0xe3, 0x95, 0x59, 0x40, 0x5e, 0x64, 0xe5, 0x64, 0x3f, 0xfd, 0x21, 0x09,
+ 0x9d, 0xf3, 0xcd, 0xc7, 0xa4, 0x2a, 0xe2, 0x97, 0xdd, 0xe2, 0x4f, 0xb0, 0x7d, 0x7e, 0xf5, 0x8e,
+ 0xd6, 0x4d, 0x84, 0x25, 0x54, 0x41, 0x3f, 0x8f, 0x78, 0x64, 0x1a, 0x51, 0x27, 0x9d, 0x55, 0x8a,
+ 0xe9, 0x90, 0x35, 0xab, 0x39, 0x80, 0x4b, 0x94, 0x40, 0x84, 0xa2, 0xfd, 0x73, 0xeb, 0x35, 0x7a,
+];
+const AUTHORITY_HASH_ANDROID: [u8; HASH_SIZE] = [
+ 0x04, 0x25, 0x5d, 0x60, 0x5f, 0x5c, 0x45, 0x0d, 0xf2, 0x9a, 0x6e, 0x99, 0x30, 0x03, 0xb8, 0xd6,
+ 0xe1, 0x99, 0x71, 0x1b, 0xf8, 0x44, 0xfa, 0xb5, 0x31, 0x79, 0x1c, 0x37, 0x68, 0x4e, 0x1d, 0xc0,
+ 0x24, 0x74, 0x68, 0xf8, 0x80, 0x20, 0x3e, 0x44, 0xb1, 0x43, 0xd2, 0x9c, 0xfc, 0x12, 0x9e, 0x77,
+ 0x0a, 0xde, 0x29, 0x24, 0xff, 0x2e, 0xfa, 0xc7, 0x10, 0xd5, 0x73, 0xd4, 0xc6, 0xdf, 0x62, 0x9f,
+];
+
+/// Encode the public key to CBOR Value. The input (raw 32 bytes) is wrapped into CoseKey.
+fn ed25519_public_key_to_cbor_value(public_key: &[u8]) -> Value {
+ let key = CoseKey {
+ kty: KeyType::Assigned(iana::KeyType::OKP),
+ alg: Some(Algorithm::Assigned(iana::Algorithm::EdDSA)),
+ key_ops: vec![KeyOperation::Assigned(iana::KeyOperation::Verify)].into_iter().collect(),
+ params: vec![
+ (
+ Label::Int(iana::Ec2KeyParameter::Crv as i64),
+ Value::from(iana::EllipticCurve::Ed25519 as u64),
+ ),
+ (Label::Int(iana::Ec2KeyParameter::X as i64), Value::Bytes(public_key.to_vec())),
+ ],
+ ..Default::default()
+ };
+ key.to_cbor_value().unwrap()
+}
+
+/// Makes a DICE chain (BCC) from the sample input.
+///
+/// The DICE chain is of the following format:
+/// public key derived from UDS -> ABL certificate -> AVB certificate -> Android certificate
+/// The `security_version` is included in the Android certificate.
+pub fn make_explicit_owned_dice(security_version: u64) -> OwnedDiceArtifactsWithExplicitKey {
+ let dice = make_sample_bcc_and_cdis(security_version);
+ OwnedDiceArtifactsWithExplicitKey::from_owned_artifacts(dice).unwrap()
+}
+
+fn make_sample_bcc_and_cdis(security_version: u64) -> OwnedDiceArtifacts {
+ let private_key_seed = derive_cdi_private_key_seed(UDS).unwrap();
+
+ // Gets the root public key in DICE chain (BCC).
+ let (public_key, _) = keypair_from_seed(private_key_seed.as_array()).unwrap();
+ let ed25519_public_key_value = ed25519_public_key_to_cbor_value(&public_key);
+
+ // Gets the ABL certificate to as the root certificate of DICE chain.
+ let config_values = DiceConfigValues {
+ component_name: Some(CStr::from_bytes_with_nul(b"ABL\0").unwrap()),
+ component_version: Some(1),
+ resettable: true,
+ ..Default::default()
+ };
+ let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
+ let input_values = InputValues::new(
+ CODE_HASH_ABL,
+ Config::Descriptor(config_descriptor.as_slice()),
+ AUTHORITY_HASH_ABL,
+ DiceMode::kDiceModeNormal,
+ HIDDEN_ABL,
+ );
+ let (cdi_values, cert) = retry_dice_main_flow(UDS, UDS, &input_values).unwrap();
+ let bcc_value =
+ Value::Array(vec![ed25519_public_key_value, de::from_reader(&cert[..]).unwrap()]);
+ let mut bcc: Vec<u8> = vec![];
+ ser::into_writer(&bcc_value, &mut bcc).unwrap();
+
+ // Appends AVB certificate to DICE chain.
+ let config_values = DiceConfigValues {
+ component_name: Some(CStr::from_bytes_with_nul(b"AVB\0").unwrap()),
+ component_version: Some(1),
+ resettable: true,
+ ..Default::default()
+ };
+ let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
+ let input_values = InputValues::new(
+ CODE_HASH_AVB,
+ Config::Descriptor(config_descriptor.as_slice()),
+ AUTHORITY_HASH_AVB,
+ DiceMode::kDiceModeNormal,
+ HIDDEN_AVB,
+ );
+ let dice_artifacts =
+ retry_bcc_main_flow(&cdi_values.cdi_attest, &cdi_values.cdi_seal, &bcc, &input_values)
+ .unwrap();
+
+ // Appends Android certificate to DICE chain.
+ let config_values = DiceConfigValues {
+ component_name: Some(CStr::from_bytes_with_nul(b"Android\0").unwrap()),
+ component_version: Some(12),
+ security_version: Some(security_version),
+ resettable: true,
+ ..Default::default()
+ };
+ let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
+ let input_values = InputValues::new(
+ [0u8; HASH_SIZE], // code_hash
+ Config::Descriptor(config_descriptor.as_slice()),
+ AUTHORITY_HASH_ANDROID,
+ DiceMode::kDiceModeNormal,
+ [0u8; HIDDEN_SIZE], // hidden
+ );
+ retry_bcc_main_flow(
+ dice_artifacts.cdi_attest(),
+ dice_artifacts.cdi_seal(),
+ dice_artifacts
+ .bcc()
+ .ok_or_else(|| {
+ error!("bcc is none");
+ DiceError::InvalidInput
+ })
+ .unwrap(),
+ &input_values,
+ )
+ .unwrap()
+}