1 /*
2  * Copyright (C) 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 //! Provides functions to build fake DICE artifacts for non-protected rialto used in
18 //! end-to-end tests.
19 
20 use alloc::vec;
21 use alloc::vec::Vec;
22 use ciborium::value::Value;
23 use coset::{
24     iana::{self, EnumI64},
25     Algorithm, AsCborValue, CborSerializable, CoseKey, KeyOperation, KeyType, Label,
26 };
27 use cstr::cstr;
28 use diced_open_dice::{
29     derive_cdi_private_key_seed, keypair_from_seed, retry_bcc_format_config_descriptor,
30     retry_bcc_main_flow, retry_dice_main_flow, CdiValues, Config, DiceConfigValues, DiceError,
31     DiceMode, InputValues, OwnedDiceArtifacts, Result, CDI_SIZE, HASH_SIZE, HIDDEN_SIZE,
32 };
33 use log::error;
34 
35 /// All the following data are generated with urandom.
36 const UDS: [u8; CDI_SIZE] = [
37     0x1d, 0xa5, 0xea, 0x90, 0x47, 0xfc, 0xb5, 0xf6, 0x47, 0x12, 0xd3, 0x65, 0x9c, 0xf2, 0x00, 0xe0,
38     0x06, 0xf7, 0xe8, 0x9e, 0x2f, 0xd0, 0x94, 0x7f, 0xc9, 0x9a, 0x9d, 0x40, 0xf7, 0xce, 0x13, 0x21,
39 ];
40 const CODE_HASH_PVMFW: [u8; HASH_SIZE] = [
41     0x16, 0x48, 0xf2, 0x55, 0x53, 0x23, 0xdd, 0x15, 0x2e, 0x83, 0x38, 0xc3, 0x64, 0x38, 0x63, 0x26,
42     0x0f, 0xcf, 0x5b, 0xd1, 0x3a, 0xd3, 0x40, 0x3e, 0x23, 0xf8, 0x34, 0x4c, 0x6d, 0xa2, 0xbe, 0x25,
43     0x1c, 0xb0, 0x29, 0xe8, 0xc3, 0xfb, 0xb8, 0x80, 0xdc, 0xb1, 0xd2, 0xb3, 0x91, 0x4d, 0xd3, 0xfb,
44     0x01, 0x0f, 0xe4, 0xe9, 0x46, 0xa2, 0xc0, 0x26, 0x57, 0x5a, 0xba, 0x30, 0xf7, 0x15, 0x98, 0x14,
45 ];
46 const AUTHORITY_HASH_PVMFW: [u8; HASH_SIZE] = [
47     0xf9, 0x00, 0x9d, 0xc2, 0x59, 0x09, 0xe0, 0xb6, 0x98, 0xbd, 0xe3, 0x97, 0x4a, 0xcb, 0x3c, 0xe7,
48     0x6b, 0x24, 0xc3, 0xe4, 0x98, 0xdd, 0xa9, 0x6a, 0x41, 0x59, 0x15, 0xb1, 0x23, 0xe6, 0xc8, 0xdf,
49     0xfb, 0x52, 0xb4, 0x52, 0xc1, 0xb9, 0x61, 0xdd, 0xbc, 0x5b, 0x37, 0x0e, 0x12, 0x12, 0xb2, 0xfd,
50     0xc1, 0x09, 0xb0, 0xcf, 0x33, 0x81, 0x4c, 0xc6, 0x29, 0x1b, 0x99, 0xea, 0xae, 0xfd, 0xaa, 0x0d,
51 ];
52 const HIDDEN_PVMFW: [u8; HIDDEN_SIZE] = [
53     0xa2, 0x01, 0xd0, 0xc0, 0xaa, 0x75, 0x3c, 0x06, 0x43, 0x98, 0x6c, 0xc3, 0x5a, 0xb5, 0x5f, 0x1f,
54     0x0f, 0x92, 0x44, 0x3b, 0x0e, 0xd4, 0x29, 0x75, 0xe3, 0xdb, 0x36, 0xda, 0xc8, 0x07, 0x97, 0x4d,
55     0xff, 0xbc, 0x6a, 0xa4, 0x8a, 0xef, 0xc4, 0x7f, 0xf8, 0x61, 0x7d, 0x51, 0x4d, 0x2f, 0xdf, 0x7e,
56     0x8c, 0x3d, 0xa3, 0xfc, 0x63, 0xd4, 0xd4, 0x74, 0x8a, 0xc4, 0x14, 0x45, 0x83, 0x6b, 0x12, 0x7e,
57 ];
58 const CODE_HASH_SERVICE_VM: [u8; HASH_SIZE] = [
59     0xa4, 0x0c, 0xcb, 0xc1, 0xbf, 0xfa, 0xcc, 0xfd, 0xeb, 0xf4, 0xfc, 0x43, 0x83, 0x7f, 0x46, 0x8d,
60     0xd8, 0xd8, 0x14, 0xc1, 0x96, 0x14, 0x1f, 0x6e, 0xb3, 0xa0, 0xd9, 0x56, 0xb3, 0xbf, 0x2f, 0xfa,
61     0x88, 0x70, 0x11, 0x07, 0x39, 0xa4, 0xd2, 0xa9, 0x6b, 0x18, 0x28, 0xe8, 0x29, 0x20, 0x49, 0x0f,
62     0xbb, 0x8d, 0x08, 0x8c, 0xc6, 0x54, 0xe9, 0x71, 0xd2, 0x7e, 0xa4, 0xfe, 0x58, 0x7f, 0xd3, 0xc7,
63 ];
64 pub(crate) const AUTHORITY_HASH_SERVICE_VM: [u8; HASH_SIZE] = [
65     0xb2, 0x69, 0x05, 0x48, 0x56, 0xb5, 0xfa, 0x55, 0x6f, 0xac, 0x56, 0xd9, 0x02, 0x35, 0x2b, 0xaa,
66     0x4c, 0xba, 0x28, 0xdd, 0x82, 0x3a, 0x86, 0xf5, 0xd4, 0xc2, 0xf1, 0xf9, 0x35, 0x7d, 0xe4, 0x43,
67     0x13, 0xbf, 0xfe, 0xd3, 0x36, 0xd8, 0x1c, 0x12, 0x78, 0x5c, 0x9c, 0x3e, 0xf6, 0x66, 0xef, 0xab,
68     0x3d, 0x0f, 0x89, 0xa4, 0x6f, 0xc9, 0x72, 0xee, 0x73, 0x43, 0x02, 0x8a, 0xef, 0xbc, 0x05, 0x98,
69 ];
70 const HIDDEN_SERVICE_VM: [u8; HIDDEN_SIZE] = [
71     0x5b, 0x3f, 0xc9, 0x6b, 0xe3, 0x95, 0x59, 0x40, 0x5e, 0x64, 0xe5, 0x64, 0x3f, 0xfd, 0x21, 0x09,
72     0x9d, 0xf3, 0xcd, 0xc7, 0xa4, 0x2a, 0xe2, 0x97, 0xdd, 0xe2, 0x4f, 0xb0, 0x7d, 0x7e, 0xf5, 0x8e,
73     0xd6, 0x4d, 0x84, 0x25, 0x54, 0x41, 0x3f, 0x8f, 0x78, 0x64, 0x1a, 0x51, 0x27, 0x9d, 0x55, 0x8a,
74     0xe9, 0x90, 0x35, 0xab, 0x39, 0x80, 0x4b, 0x94, 0x40, 0x84, 0xa2, 0xfd, 0x73, 0xeb, 0x35, 0x7a,
75 ];
76 
ed25519_public_key_to_cbor_value(public_key: &[u8]) -> Result<Value>77 fn ed25519_public_key_to_cbor_value(public_key: &[u8]) -> Result<Value> {
78     let key = CoseKey {
79         kty: KeyType::Assigned(iana::KeyType::OKP),
80         alg: Some(Algorithm::Assigned(iana::Algorithm::EdDSA)),
81         key_ops: vec![KeyOperation::Assigned(iana::KeyOperation::Verify)].into_iter().collect(),
82         params: vec![
83             (
84                 Label::Int(iana::Ec2KeyParameter::Crv.to_i64()),
85                 iana::EllipticCurve::Ed25519.to_i64().into(),
86             ),
87             (Label::Int(iana::Ec2KeyParameter::X.to_i64()), Value::Bytes(public_key.to_vec())),
88         ],
89         ..Default::default()
90     };
91     key.to_cbor_value().map_err(|e| {
92         error!("Failed to serialize the key to CBOR data: {e}");
93         DiceError::InvalidInput
94     })
95 }
96 
97 /// Generates a fake DICE artifacts with a DICE chain up to the certificate describing pvmfw.
98 ///
99 /// The fake DICE chain has the following nodes:
100 /// Root public key -> pvmfw certificate
fake_dice_artifacts_up_to_pvmfw() -> Result<(CdiValues, Vec<u8>)>101 pub(crate) fn fake_dice_artifacts_up_to_pvmfw() -> Result<(CdiValues, Vec<u8>)> {
102     let private_key_seed = derive_cdi_private_key_seed(&UDS).map_err(|e| {
103         error!("Failed to derive private key seed: {e}");
104         e
105     })?;
106 
107     // Gets the root public key in DICE chain.
108     let (public_key, _) = keypair_from_seed(private_key_seed.as_array()).map_err(|e| {
109         error!("Failed to generate key pair: {e}");
110         e
111     })?;
112     let ed25519_public_key_value = ed25519_public_key_to_cbor_value(&public_key)?;
113 
114     // Gets the pvmfw certificate to as the root certificate of DICE chain.
115     let config_values = DiceConfigValues {
116         component_name: Some(cstr!("Protected VM firmware")),
117         component_version: Some(1),
118         resettable: true,
119         ..Default::default()
120     };
121     let config_descriptor = retry_bcc_format_config_descriptor(&config_values)?;
122     let input_values = InputValues::new(
123         CODE_HASH_PVMFW,
124         Config::Descriptor(config_descriptor.as_slice()),
125         AUTHORITY_HASH_PVMFW,
126         DiceMode::kDiceModeDebug,
127         HIDDEN_PVMFW,
128     );
129     let (cdi_values, cert) = retry_dice_main_flow(&UDS, &UDS, &input_values).map_err(|e| {
130         error!("Failed to run first main flow: {e}");
131         e
132     })?;
133     let dice_chain = Value::Array(vec![
134         ed25519_public_key_value,
135         Value::from_slice(&cert).map_err(|e| {
136             error!("Deserialize root DICE certificate failed: {e}");
137             DiceError::InvalidInput
138         })?,
139     ]);
140     let dice_chain = dice_chain.to_vec().map_err(|e| {
141         error!("Failed to serialize the DICE chain to CBOR data: {e}");
142         DiceError::InvalidInput
143     })?;
144     Ok((cdi_values, dice_chain))
145 }
146 
147 /// Generates fake DICE artifacts for service VM with a DICE chain up to the certificate
148 /// describing service VM.
149 ///
150 /// The fake DICE chain has the following nodes:
151 /// Root public key -> pvmfw certificate -> service VM certificate
152 ///
153 /// The fake DICE chain is solely used in non-protected rialto for testing
154 /// purposes.
fake_service_vm_dice_artifacts() -> Result<OwnedDiceArtifacts>155 pub fn fake_service_vm_dice_artifacts() -> Result<OwnedDiceArtifacts> {
156     let (cdi_values, dice_chain) = fake_dice_artifacts_up_to_pvmfw()?;
157     let config_values = DiceConfigValues {
158         component_name: Some(cstr!("vm_entry")),
159         component_version: Some(12),
160         resettable: true,
161         ..Default::default()
162     };
163     let config_descriptor = retry_bcc_format_config_descriptor(&config_values)?;
164     let input_values = InputValues::new(
165         CODE_HASH_SERVICE_VM,
166         Config::Descriptor(config_descriptor.as_slice()),
167         AUTHORITY_HASH_SERVICE_VM,
168         DiceMode::kDiceModeDebug,
169         HIDDEN_SERVICE_VM,
170     );
171     retry_bcc_main_flow(&cdi_values.cdi_attest, &cdi_values.cdi_seal, &dice_chain, &input_values)
172         .map_err(|e| {
173             error!("Failed to run the service VM BCC main flow: {e}");
174             e
175         })
176 }
177