1 /*
2 * Copyright (c) 2021, 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 #define LOG_TAG "credstore"
18
19 #include <android-base/logging.h>
20 #include <android/binder_manager.h>
21 #include <android/hardware/identity/support/IdentityCredentialSupport.h>
22
23 #include <android/security/identity/ICredentialStore.h>
24 #include <android/security/identity/ISession.h>
25
26 #include "Session.h"
27 #include "Util.h"
28
29 namespace android {
30 namespace security {
31 namespace identity {
32
33 using std::optional;
34
35 using ::android::hardware::identity::IPresentationSession;
36 using ::android::hardware::identity::IWritableIdentityCredential;
37
38 using ::android::hardware::identity::support::ecKeyPairGetPkcs12;
39 using ::android::hardware::identity::support::ecKeyPairGetPrivateKey;
40 using ::android::hardware::identity::support::ecKeyPairGetPublicKey;
41 using ::android::hardware::identity::support::hexdump;
42 using ::android::hardware::identity::support::sha256;
43
getEphemeralKeyPair(vector<uint8_t> * _aidl_return)44 Status Session::getEphemeralKeyPair(vector<uint8_t>* _aidl_return) {
45 vector<uint8_t> keyPair;
46 Status status = halBinder_->getEphemeralKeyPair(&keyPair);
47 if (!status.isOk()) {
48 return halStatusToGenericError(status);
49 }
50 time_t nowSeconds = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
51 time_t validityNotBefore = nowSeconds;
52 time_t validityNotAfter = nowSeconds + 24 * 60 * 60;
53 optional<vector<uint8_t>> pkcs12Bytes = ecKeyPairGetPkcs12(keyPair,
54 "ephemeralKey", // Alias for key
55 "0", // Serial, as a decimal number
56 "Credstore", // Issuer
57 "Ephemeral Key", // Subject
58 validityNotBefore, validityNotAfter);
59 if (!pkcs12Bytes) {
60 return Status::fromServiceSpecificError(ICredentialStore::ERROR_GENERIC,
61 "Error creating PKCS#12 structure for key pair");
62 }
63 *_aidl_return = pkcs12Bytes.value();
64 return Status::ok();
65 }
66
setReaderEphemeralPublicKey(const vector<uint8_t> & publicKey)67 Status Session::setReaderEphemeralPublicKey(const vector<uint8_t>& publicKey) {
68 Status status = halBinder_->setReaderEphemeralPublicKey(publicKey);
69 if (!status.isOk()) {
70 return halStatusToGenericError(status);
71 }
72 return Status::ok();
73 }
74
setSessionTranscript(const vector<uint8_t> & sessionTranscript)75 Status Session::setSessionTranscript(const vector<uint8_t>& sessionTranscript) {
76 Status status = halBinder_->setSessionTranscript(sessionTranscript);
77 if (!status.isOk()) {
78 return halStatusToGenericError(status);
79 }
80 return Status::ok();
81 }
82
getCredentialForPresentation(const string & credentialName,sp<ICredential> * _aidl_return)83 Status Session::getCredentialForPresentation(const string& credentialName,
84 sp<ICredential>* _aidl_return) {
85 return store_->getCredentialCommon(credentialName, cipherSuite_, halBinder_, _aidl_return);
86 }
87
getAuthChallenge(int64_t * _aidl_return)88 Status Session::getAuthChallenge(int64_t* _aidl_return) {
89 *_aidl_return = 0;
90 int64_t authChallenge;
91 Status status = halBinder_->getAuthChallenge(&authChallenge);
92 if (!status.isOk()) {
93 return halStatusToGenericError(status);
94 }
95 *_aidl_return = authChallenge;
96 return Status::ok();
97 }
98
99 } // namespace identity
100 } // namespace security
101 } // namespace android
102