| // Copyright 2021, 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 input values for a DICE chain, a sample UDS, |
| //! as well as tuple of CDIs and BCC derived thereof. |
| |
| use android_hardware_security_dice::aidl::android::hardware::security::dice::{ |
| Config::Config as BinderConfig, InputValues::InputValues as BinderInputValues, Mode::Mode, |
| }; |
| use anyhow::{Context, Result}; |
| use dice::ContextImpl; |
| use diced_open_dice_cbor as dice; |
| use diced_utils::cbor; |
| use diced_utils::InputValues; |
| use keystore2_crypto::ZVec; |
| use std::convert::{TryFrom, TryInto}; |
| use std::io::Write; |
| |
| /// Sample UDS used to perform the root dice flow by `make_sample_bcc_and_cdis`. |
| pub static UDS: &[u8; dice::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, |
| ]; |
| |
| fn encode_pub_key_ed25519(pub_key: &[u8], stream: &mut dyn Write) -> Result<()> { |
| cbor::encode_header(5 /* CBOR MAP */, 5, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode map header.")?; |
| cbor::encode_number(1, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode Key type tag.")?; |
| cbor::encode_number(1, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode Key type.")?; |
| cbor::encode_number(3, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode algorithm tag.")?; |
| // Encoding a -8 for AlgorithmEdDSA. The encoded number is -1 - <header argument>, |
| // the an argument of 7 below. |
| cbor::encode_header(1 /* CBOR NEGATIVE INT */, 7 /* -1 -7 = -8*/, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode algorithm.")?; |
| cbor::encode_number(4, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode ops tag.")?; |
| // Ops 2 for verify. |
| cbor::encode_number(2, stream).context("In encode_pub_key_ed25519: Trying to encode ops.")?; |
| cbor::encode_header(1 /* CBOR NEGATIVE INT */, 0 /* -1 -0 = -1*/, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode curve tag.")?; |
| // Curve 6 for Ed25519 |
| cbor::encode_number(6, stream).context("In encode_pub_key_ed25519: Trying to encode curve.")?; |
| cbor::encode_header(1 /* CBOR NEGATIVE INT */, 1 /* -1 -1 = -2*/, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode X coordinate tag.")?; |
| cbor::encode_bstr(pub_key, stream) |
| .context("In encode_pub_key_ed25519: Trying to encode X coordinate.")?; |
| Ok(()) |
| } |
| |
| /// Derives a tuple of (CDI_ATTEST, CDI_SEAL, BCC) derived of the vector of input values returned |
| /// by `get_input_values_vector`. |
| pub fn make_sample_bcc_and_cdis() -> Result<(ZVec, ZVec, Vec<u8>)> { |
| let mut dice_ctx = dice::OpenDiceCborContext::new(); |
| let private_key_seed = dice_ctx |
| .derive_cdi_private_key_seed(UDS) |
| .context("In make_sample_bcc_and_cdis: Trying to derive private key seed.")?; |
| |
| let (public_key, _) = |
| dice_ctx |
| .keypair_from_seed(&private_key_seed[..].try_into().context( |
| "In make_sample_bcc_and_cids: Failed to convert seed to array reference.", |
| )?) |
| .context("In make_sample_bcc_and_cids: Failed to generate key pair.")?; |
| |
| let input_values_vector = get_input_values_vector(); |
| |
| let (cdi_attest, cdi_seal, mut cert) = dice_ctx |
| .main_flow( |
| UDS, |
| UDS, |
| &InputValues::try_from(&input_values_vector[0]) |
| .context("In make_sample_bcc_and_cdis: Trying to convert input values. (0)")?, |
| ) |
| .context("In make_sample_bcc_and_cdis: Trying to run first main flow.")?; |
| |
| let mut bcc: Vec<u8> = vec![]; |
| |
| cbor::encode_header(4 /* CBOR ARRAY */, 2, &mut bcc) |
| .context("In make_sample_bcc_and_cdis: Trying to encode array header.")?; |
| encode_pub_key_ed25519(&public_key, &mut bcc) |
| .context("In make_sample_bcc_and_cdis: Trying encode pub_key.")?; |
| |
| bcc.append(&mut cert); |
| |
| let (cdi_attest, cdi_seal, bcc) = dice_ctx |
| .bcc_main_flow( |
| &cdi_attest[..].try_into().context( |
| "In make_sample_bcc_and_cdis: Failed to convert cdi_attest to array reference. (1)", |
| )?, |
| &cdi_seal[..].try_into().context( |
| "In make_sample_bcc_and_cdis: Failed to convert cdi_seal to array reference. (1)", |
| )?, |
| &bcc, |
| &InputValues::try_from(&input_values_vector[1]) |
| .context("In make_sample_bcc_and_cdis: Trying to convert input values. (1)")?, |
| ) |
| .context("In make_sample_bcc_and_cdis: Trying to run first bcc main flow.")?; |
| dice_ctx |
| .bcc_main_flow( |
| &cdi_attest[..].try_into().context( |
| "In make_sample_bcc_and_cdis: Failed to convert cdi_attest to array reference. (2)", |
| )?, |
| &cdi_seal[..].try_into().context( |
| "In make_sample_bcc_and_cdis: Failed to convert cdi_seal to array reference. (2)", |
| )?, |
| &bcc, |
| &InputValues::try_from(&input_values_vector[2]) |
| .context("In make_sample_bcc_and_cdis: Trying to convert input values. (2)")?, |
| ) |
| .context("In make_sample_bcc_and_cdis: Trying to run second bcc main flow.") |
| } |
| |
| fn make_input_values( |
| code_hash: &[u8; dice::HASH_SIZE], |
| authority_hash: &[u8; dice::HASH_SIZE], |
| config_name: &str, |
| config_version: u64, |
| config_resettable: bool, |
| mode: Mode, |
| hidden: &[u8; dice::HIDDEN_SIZE], |
| ) -> Result<BinderInputValues> { |
| Ok(BinderInputValues { |
| codeHash: code_hash.to_vec(), |
| config: BinderConfig { |
| desc: dice::bcc::format_config_descriptor( |
| Some(config_name), |
| Some(config_version), |
| config_resettable, |
| ) |
| .context("In make_input_values: Failed to format config descriptor.")?, |
| }, |
| authorityHash: authority_hash.to_vec(), |
| authorityDescriptor: None, |
| hidden: hidden.to_vec(), |
| mode, |
| }) |
| } |
| |
| /// Returns a set of sample input for a dice chain comprising the android boot loader ABL, |
| /// the verified boot information AVB, and Android S. |
| pub fn get_input_values_vector() -> Vec<BinderInputValues> { |
| vec![ |
| make_input_values( |
| &[ |
| // code hash |
| 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, |
| ], |
| &[ |
| // authority hash |
| 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, |
| ], |
| "ABL", // config name |
| 1, // config version |
| true, // resettable |
| Mode::NORMAL, |
| &[ |
| // hidden |
| 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, |
| ], |
| ) |
| .unwrap(), |
| make_input_values( |
| &[ |
| // code hash |
| 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, |
| ], |
| &[ |
| // authority hash |
| 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, |
| ], |
| "AVB", // config name |
| 1, // config version |
| true, // resettable |
| Mode::NORMAL, |
| &[ |
| // hidden |
| 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, |
| ], |
| ) |
| .unwrap(), |
| make_input_values( |
| &[ |
| // code hash |
| 0; dice::HASH_SIZE |
| ], |
| &[ |
| // authority hash |
| 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, |
| ], |
| "Android", // config name |
| 12, // config version |
| true, // resettable |
| Mode::NORMAL, |
| &[ |
| // hidden |
| 0; dice::HIDDEN_SIZE |
| ], |
| ) |
| .unwrap(), |
| ] |
| } |
| |
| #[cfg(test)] |
| mod test { |
| use super::*; |
| |
| // This simple test checks if the invocation succeeds, essentially it tests |
| // if the initial bcc is accepted by `DiceContext::bcc_main_flow`. |
| #[test] |
| fn make_sample_bcc_and_cdis_test() { |
| make_sample_bcc_and_cdis().unwrap(); |
| } |
| } |