| /* |
| * 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. |
| */ |
| |
| //! VTS tests for sinks |
| use super::*; |
| use authgraph_core::{key, keyexchange as ke}; |
| |
| /// Run AuthGraph tests against the provided sink, using a local test source implementation. |
| pub fn test( |
| local_source: &mut ke::AuthGraphParticipant, |
| sink: binder::Strong<dyn IAuthGraphKeyExchange>, |
| ) { |
| test_mainline(local_source, sink.clone()); |
| test_corrupt_sig(local_source, sink.clone()); |
| test_corrupt_keys(local_source, sink); |
| } |
| |
| /// Perform mainline AuthGraph key exchange with the provided sink and local implementation. |
| /// Return the agreed AES keys in plaintext, together with the session ID. |
| pub fn test_mainline( |
| local_source: &mut ke::AuthGraphParticipant, |
| sink: binder::Strong<dyn IAuthGraphKeyExchange>, |
| ) -> ([key::AesKey; 2], Vec<u8>) { |
| // Step 1: create an ephemeral ECDH key at the (local) source. |
| let source_init_info = local_source |
| .create() |
| .expect("failed to create() with local impl"); |
| |
| // Step 2: pass the source's ECDH public key and other session info to the (remote) sink. |
| let init_result = sink |
| .init( |
| &build_plain_pub_key(&source_init_info.ke_key.pub_key), |
| &vec_to_identity(&source_init_info.identity), |
| &source_init_info.nonce, |
| source_init_info.version, |
| ) |
| .expect("failed to init() with remote impl"); |
| let sink_init_info = init_result.sessionInitiationInfo; |
| let sink_pub_key = extract_plain_pub_key(&sink_init_info.key.pubKey); |
| |
| let sink_info = init_result.sessionInfo; |
| assert!(!sink_info.sessionId.is_empty()); |
| |
| // The AuthGraph core library will verify the session ID signature, but do it here too. |
| let sink_verification_key = local_source |
| .peer_verification_key_from_identity(&sink_init_info.identity.identity) |
| .expect("failed to get peer verification from identity"); |
| local_source |
| .verify_signature_on_session_id( |
| &sink_verification_key, |
| &sink_info.sessionId, |
| &sink_info.signature.signature, |
| ) |
| .expect("failed verification of signed session ID"); |
| |
| // Step 3: pass the sink's ECDH public key and other session info to the (local) source, so it |
| // can calculate the same pair of symmetric keys. |
| let source_info = local_source |
| .finish( |
| &sink_pub_key.plainPubKey, |
| &sink_init_info.identity.identity, |
| &sink_info.signature.signature, |
| &sink_init_info.nonce, |
| sink_init_info.version, |
| source_init_info.ke_key, |
| ) |
| .expect("failed to finish() with local impl"); |
| assert!(!source_info.session_id.is_empty()); |
| |
| // The AuthGraph core library will verify the session ID signature, but do it here too. |
| let source_verification_key = key::Identity::from_slice(&source_init_info.identity) |
| .expect("invalid identity CBOR") |
| .cert_chain |
| .root_key; |
| local_source |
| .verify_signature_on_session_id( |
| &source_verification_key, |
| &source_info.session_id, |
| &source_info.session_id_signature, |
| ) |
| .expect("failed verification of signed session ID"); |
| |
| // Both ends should agree on the session ID. |
| assert_eq!(source_info.session_id, sink_info.sessionId); |
| |
| // Step 4: pass the (local) source's session ID signature back to the sink, so it can check it |
| // and update the symmetric keys so they're marked as authentication complete. |
| let _sink_arcs = sink |
| .authenticationComplete( |
| &vec_to_signature(&source_info.session_id_signature), |
| &sink_info.sharedKeys, |
| ) |
| .expect("failed to authenticationComplete() with remote sink"); |
| // Decrypt and return the session keys. |
| let decrypted_shared_keys = local_source |
| .decipher_shared_keys_from_arcs(&source_info.shared_keys) |
| .expect("failed to decrypt shared key arcs") |
| .try_into(); |
| let decrypted_shared_keys_array = match decrypted_shared_keys { |
| Ok(array) => array, |
| Err(_) => panic!("wrong number of decrypted shared key arcs"), |
| }; |
| (decrypted_shared_keys_array, sink_info.sessionId) |
| } |
| |
| /// Perform mainline AuthGraph key exchange with the provided sink, but provide an invalid |
| /// session ID signature. |
| pub fn test_corrupt_sig( |
| local_source: &mut ke::AuthGraphParticipant, |
| sink: binder::Strong<dyn IAuthGraphKeyExchange>, |
| ) { |
| // Step 1: create an ephemeral ECDH key at the (local) source. |
| let source_init_info = local_source |
| .create() |
| .expect("failed to create() with local impl"); |
| |
| // Step 2: pass the source's ECDH public key and other session info to the (remote) sink. |
| let init_result = sink |
| .init( |
| &build_plain_pub_key(&source_init_info.ke_key.pub_key), |
| &vec_to_identity(&source_init_info.identity), |
| &source_init_info.nonce, |
| source_init_info.version, |
| ) |
| .expect("failed to init() with remote impl"); |
| let sink_init_info = init_result.sessionInitiationInfo; |
| let sink_pub_key = extract_plain_pub_key(&sink_init_info.key.pubKey); |
| |
| let sink_info = init_result.sessionInfo; |
| assert!(!sink_info.sessionId.is_empty()); |
| |
| // Step 3: pass the sink's ECDH public key and other session info to the (local) source, so it |
| // can calculate the same pair of symmetric keys. |
| let source_info = local_source |
| .finish( |
| &sink_pub_key.plainPubKey, |
| &sink_init_info.identity.identity, |
| &sink_info.signature.signature, |
| &sink_init_info.nonce, |
| sink_init_info.version, |
| source_init_info.ke_key, |
| ) |
| .expect("failed to finish() with local impl"); |
| assert!(!source_info.session_id.is_empty()); |
| |
| // Build a corrupted version of the (local) source's session ID signature. |
| let mut corrupt_signature = source_info.session_id_signature.clone(); |
| let sig_len = corrupt_signature.len(); |
| corrupt_signature[sig_len - 1] ^= 0x01; |
| |
| // Step 4: pass the (local) source's **invalid** session ID signature back to the sink, |
| // which should reject it. |
| let result = |
| sink.authenticationComplete(&vec_to_signature(&corrupt_signature), &sink_info.sharedKeys); |
| let err = result.expect_err("expect failure with corrupt signature"); |
| assert_eq!( |
| err, |
| binder::Status::new_service_specific_error(Error::INVALID_SIGNATURE.0, None) |
| ); |
| } |
| |
| /// Perform mainline AuthGraph key exchange with the provided sink, but provide an invalid |
| /// Arc for the sink's key. |
| pub fn test_corrupt_keys( |
| local_source: &mut ke::AuthGraphParticipant, |
| sink: binder::Strong<dyn IAuthGraphKeyExchange>, |
| ) { |
| // Step 1: create an ephemeral ECDH key at the (local) source. |
| let source_init_info = local_source |
| .create() |
| .expect("failed to create() with local impl"); |
| |
| // Step 2: pass the source's ECDH public key and other session info to the (remote) sink. |
| let init_result = sink |
| .init( |
| &build_plain_pub_key(&source_init_info.ke_key.pub_key), |
| &vec_to_identity(&source_init_info.identity), |
| &source_init_info.nonce, |
| source_init_info.version, |
| ) |
| .expect("failed to init() with remote impl"); |
| let sink_init_info = init_result.sessionInitiationInfo; |
| let sink_pub_key = extract_plain_pub_key(&sink_init_info.key.pubKey); |
| |
| let sink_info = init_result.sessionInfo; |
| assert!(!sink_info.sessionId.is_empty()); |
| |
| // Step 3: pass the sink's ECDH public key and other session info to the (local) source, so it |
| // can calculate the same pair of symmetric keys. |
| let source_info = local_source |
| .finish( |
| &sink_pub_key.plainPubKey, |
| &sink_init_info.identity.identity, |
| &sink_info.signature.signature, |
| &sink_init_info.nonce, |
| sink_init_info.version, |
| source_init_info.ke_key, |
| ) |
| .expect("failed to finish() with local impl"); |
| assert!(!source_info.session_id.is_empty()); |
| |
| // Deliberately corrupt the sink's shared key Arcs before returning them |
| let mut corrupt_keys = sink_info.sharedKeys.clone(); |
| let len0 = corrupt_keys[0].arc.len(); |
| let len1 = corrupt_keys[1].arc.len(); |
| corrupt_keys[0].arc[len0 - 1] ^= 0x01; |
| corrupt_keys[1].arc[len1 - 1] ^= 0x01; |
| |
| // Step 4: pass the (local) source's session ID signature back to the sink, but with corrupted |
| // keys, which should be rejected. |
| let result = sink.authenticationComplete( |
| &vec_to_signature(&source_info.session_id_signature), |
| &corrupt_keys, |
| ); |
| let err = result.expect_err("expect failure with corrupt keys"); |
| assert_eq!( |
| err, |
| binder::Status::new_service_specific_error(Error::INVALID_SHARED_KEY_ARCS.0, None) |
| ); |
| } |