summaryrefslogtreecommitdiff
Diffstat
-rw-r--r--Android.mk20
-rw-r--r--GKPModule.cpp (renamed from module.cpp)26
-rw-r--r--soft/SoftGateKeeper.h182
-rw-r--r--soft/SoftGateKeeperDevice.cpp (copied from trusty_gatekeeper.cpp)147
-rw-r--r--soft/SoftGateKeeperDevice.h93
-rw-r--r--trusty/gatekeeper_ipc.h (renamed from gatekeeper_ipc.h)0
-rw-r--r--trusty/trusty_gatekeeper.cpp (renamed from trusty_gatekeeper.cpp)0
-rw-r--r--trusty/trusty_gatekeeper.h (renamed from trusty_gatekeeper.h)0
-rw-r--r--trusty/trusty_gatekeeper_ipc.c (renamed from trusty_gatekeeper_ipc.c)0
-rw-r--r--trusty/trusty_gatekeeper_ipc.h (renamed from trusty_gatekeeper_ipc.h)0
10 files changed, 354 insertions, 114 deletions
diff --git a/soft/SoftGateKeeper.h b/soft/SoftGateKeeper.h
new file mode 100644
index 0000000..cb02a6f
--- a/dev/null
+++ b/soft/SoftGateKeeper.h
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2015 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.
+ *
+ */
+
+#ifndef SOFT_GATEKEEPER_H_
+#define SOFT_GATEKEEPER_H_
+
+extern "C" {
+#include <openssl/rand.h>
+#include <openssl/sha.h>
+
+#include <crypto_scrypt.h>
+}
+
+#include <android-base/memory.h>
+#include <UniquePtr.h>
+#include <gatekeeper/gatekeeper.h>
+
+#include <iostream>
+#include <unordered_map>
+
+namespace gatekeeper {
+
+struct fast_hash_t {
+ uint64_t salt;
+ uint8_t digest[SHA256_DIGEST_LENGTH];
+};
+
+class SoftGateKeeper : public GateKeeper {
+public:
+ static const uint32_t SIGNATURE_LENGTH_BYTES = 32;
+
+ // scrypt params
+ static const uint64_t N = 16384;
+ static const uint32_t r = 8;
+ static const uint32_t p = 1;
+
+ static const int MAX_UINT_32_CHARS = 11;
+
+ SoftGateKeeper() {
+ key_.reset(new uint8_t[SIGNATURE_LENGTH_BYTES]);
+ memset(key_.get(), 0, SIGNATURE_LENGTH_BYTES);
+ }
+
+ virtual ~SoftGateKeeper() {
+ }
+
+ virtual bool GetAuthTokenKey(const uint8_t **auth_token_key,
+ uint32_t *length) const {
+ if (auth_token_key == NULL || length == NULL) return false;
+ uint8_t *auth_token_key_copy = new uint8_t[SIGNATURE_LENGTH_BYTES];
+ memcpy(auth_token_key_copy, key_.get(), SIGNATURE_LENGTH_BYTES);
+
+ *auth_token_key = auth_token_key_copy;
+ *length = SIGNATURE_LENGTH_BYTES;
+ return true;
+ }
+
+ virtual void GetPasswordKey(const uint8_t **password_key, uint32_t *length) {
+ if (password_key == NULL || length == NULL) return;
+ uint8_t *password_key_copy = new uint8_t[SIGNATURE_LENGTH_BYTES];
+ memcpy(password_key_copy, key_.get(), SIGNATURE_LENGTH_BYTES);
+
+ *password_key = password_key_copy;
+ *length = SIGNATURE_LENGTH_BYTES;
+ }
+
+ virtual void ComputePasswordSignature(uint8_t *signature, uint32_t signature_length,
+ const uint8_t *, uint32_t, const uint8_t *password,
+ uint32_t password_length, salt_t salt) const {
+ if (signature == NULL) return;
+ crypto_scrypt(password, password_length, reinterpret_cast<uint8_t *>(&salt),
+ sizeof(salt), N, r, p, signature, signature_length);
+ }
+
+ virtual void GetRandom(void *random, uint32_t requested_length) const {
+ if (random == NULL) return;
+ RAND_pseudo_bytes((uint8_t *) random, requested_length);
+ }
+
+ virtual void ComputeSignature(uint8_t *signature, uint32_t signature_length,
+ const uint8_t *, uint32_t, const uint8_t *, const uint32_t) const {
+ if (signature == NULL) return;
+ memset(signature, 0, signature_length);
+ }
+
+ virtual uint64_t GetMillisecondsSinceBoot() const {
+ struct timespec time;
+ int res = clock_gettime(CLOCK_BOOTTIME, &time);
+ if (res < 0) return 0;
+ return (time.tv_sec * 1000) + (time.tv_nsec / 1000 / 1000);
+ }
+
+ virtual bool IsHardwareBacked() const {
+ return false;
+ }
+
+ virtual bool GetFailureRecord(uint32_t uid, secure_id_t user_id, failure_record_t *record,
+ bool /* secure */) {
+ failure_record_t *stored = &failure_map_[uid];
+ if (user_id != stored->secure_user_id) {
+ stored->secure_user_id = user_id;
+ stored->last_checked_timestamp = 0;
+ stored->failure_counter = 0;
+ }
+ memcpy(record, stored, sizeof(*record));
+ return true;
+ }
+
+ virtual bool ClearFailureRecord(uint32_t uid, secure_id_t user_id, bool /* secure */) {
+ failure_record_t *stored = &failure_map_[uid];
+ stored->secure_user_id = user_id;
+ stored->last_checked_timestamp = 0;
+ stored->failure_counter = 0;
+ return true;
+ }
+
+ virtual bool WriteFailureRecord(uint32_t uid, failure_record_t *record, bool /* secure */) {
+ failure_map_[uid] = *record;
+ return true;
+ }
+
+ fast_hash_t ComputeFastHash(const SizedBuffer &password, uint64_t salt) {
+ fast_hash_t fast_hash;
+ size_t digest_size = password.length + sizeof(salt);
+ std::unique_ptr<uint8_t[]> digest(new uint8_t[digest_size]);
+ memcpy(digest.get(), &salt, sizeof(salt));
+ memcpy(digest.get() + sizeof(salt), password.buffer.get(), password.length);
+
+ SHA256(digest.get(), digest_size, (uint8_t *) &fast_hash.digest);
+
+ fast_hash.salt = salt;
+ return fast_hash;
+ }
+
+ bool VerifyFast(const fast_hash_t &fast_hash, const SizedBuffer &password) {
+ fast_hash_t computed = ComputeFastHash(password, fast_hash.salt);
+ return memcmp(computed.digest, fast_hash.digest, SHA256_DIGEST_LENGTH) == 0;
+ }
+
+ bool DoVerify(const password_handle_t *expected_handle, const SizedBuffer &password) {
+ uint64_t user_id = android::base::get_unaligned<secure_id_t>(&expected_handle->user_id);
+ FastHashMap::const_iterator it = fast_hash_map_.find(user_id);
+ if (it != fast_hash_map_.end() && VerifyFast(it->second, password)) {
+ return true;
+ } else {
+ if (GateKeeper::DoVerify(expected_handle, password)) {
+ uint64_t salt;
+ GetRandom(&salt, sizeof(salt));
+ fast_hash_map_[user_id] = ComputeFastHash(password, salt);
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+private:
+
+ typedef std::unordered_map<uint32_t, failure_record_t> FailureRecordMap;
+ typedef std::unordered_map<uint64_t, fast_hash_t> FastHashMap;
+
+ UniquePtr<uint8_t[]> key_;
+ FailureRecordMap failure_map_;
+ FastHashMap fast_hash_map_;
+};
+}
+
+#endif // SOFT_GATEKEEPER_H_
generated by cgit at 2024-05-09 23:18:55 (GMT)