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//
// Copyright (C) 2014 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.
//
#include <string>
#include <gtest/gtest.h>
#include "trunks/hmac_authorization_delegate.h"
namespace trunks {
TEST(HmacAuthorizationDelegateTest, UninitializedSessionTest) {
HmacAuthorizationDelegate delegate;
std::string dummy;
std::string p_hash("test");
EXPECT_FALSE(delegate.GetCommandAuthorization(p_hash, false, false, &dummy));
EXPECT_EQ(0u, dummy.size());
EXPECT_FALSE(delegate.CheckResponseAuthorization(p_hash, dummy));
EXPECT_FALSE(delegate.EncryptCommandParameter(&dummy));
EXPECT_FALSE(delegate.DecryptResponseParameter(&dummy));
}
TEST(HmacAuthorizationDelegateTest, SessionKeyTest) {
HmacAuthorizationDelegate delegate;
TPM2B_NONCE nonce;
nonce.size = kAesKeySize;
memset(nonce.buffer, 0, nonce.size);
TPM_HANDLE dummy_handle = HMAC_SESSION_FIRST;
EXPECT_TRUE(delegate.InitSession(dummy_handle, nonce, nonce, std::string(),
std::string(), false));
EXPECT_EQ(0u, delegate.session_key_.size());
std::string dummy_auth = std::string("authorization");
std::string dummy_salt = std::string("salt");
EXPECT_TRUE(delegate.InitSession(dummy_handle, nonce, nonce, dummy_salt,
dummy_auth, false));
EXPECT_EQ(kHashDigestSize, delegate.session_key_.size());
// TODO(usanghi): Use TCG TPM2.0 test vectors when available.
std::string expected_key(
"\xfb\x2f\x3c\x33\x65\x3e\xdc\x47"
"\xda\xbe\x4e\xb7\xf4\x6c\x19\x4d"
"\xea\x50\xb2\x11\x54\x45\x32\x73"
"\x47\x38\xef\xb3\x4a\x82\x29\x94",
kHashDigestSize);
EXPECT_EQ(0, expected_key.compare(delegate.session_key_));
}
TEST(HmacAuthorizationDelegateTest, EncryptDecryptTest) {
HmacAuthorizationDelegate delegate;
std::string plaintext_parameter("parameter");
std::string encrypted_parameter(plaintext_parameter);
// Test with session not initialized.
EXPECT_FALSE(delegate.EncryptCommandParameter(&encrypted_parameter));
EXPECT_FALSE(delegate.DecryptResponseParameter(&encrypted_parameter));
// Test with encryption not enabled.
TPM_HANDLE dummy_handle = HMAC_SESSION_FIRST;
TPM2B_NONCE nonce;
nonce.size = kAesKeySize;
std::string salt("salt");
ASSERT_TRUE(delegate.InitSession(dummy_handle, nonce, nonce, salt,
std::string(), false));
EXPECT_TRUE(delegate.EncryptCommandParameter(&encrypted_parameter));
EXPECT_EQ(0, plaintext_parameter.compare(encrypted_parameter));
EXPECT_TRUE(delegate.DecryptResponseParameter(&encrypted_parameter));
EXPECT_EQ(0, plaintext_parameter.compare(encrypted_parameter));
// Test with encryption enabled.
ASSERT_TRUE(delegate.InitSession(dummy_handle, nonce, nonce, salt,
std::string(), true));
EXPECT_TRUE(delegate.EncryptCommandParameter(&encrypted_parameter));
EXPECT_NE(0, plaintext_parameter.compare(encrypted_parameter));
// Calling EncryptCommandParameter regenerated the caller_nonce.
// We need to manually switch tpm_nonce and caller_nonce to ensure
// that DecryptResponseParameter has the correct nonces.
delegate.tpm_nonce_ = delegate.caller_nonce_;
delegate.caller_nonce_ = nonce;
EXPECT_TRUE(delegate.DecryptResponseParameter(&encrypted_parameter));
EXPECT_EQ(0, plaintext_parameter.compare(encrypted_parameter));
}
class HmacAuthorizationDelegateFixture : public testing::Test {
public:
HmacAuthorizationDelegateFixture() {}
~HmacAuthorizationDelegateFixture() override {}
void SetUp() override {
session_handle_ = HMAC_SESSION_FIRST;
session_nonce_.size = kAesKeySize;
memset(session_nonce_.buffer, 0, kAesKeySize);
ASSERT_TRUE(delegate_.InitSession(session_handle_,
session_nonce_, // TPM nonce.
session_nonce_, // Caller nonce.
std::string(), // Salt.
std::string(), // Bind auth value.
false)); // Enable encryption.
}
protected:
TPM_HANDLE session_handle_;
TPM2B_NONCE session_nonce_;
HmacAuthorizationDelegate delegate_;
};
TEST_F(HmacAuthorizationDelegateFixture, NonceRegenerationTest) {
ASSERT_TRUE(delegate_.InitSession(session_handle_,
session_nonce_, // TPM nonce.
session_nonce_, // Caller nonce.
std::string(), // Salt.
std::string(), // Bind auth value.
true)); // Enable encryption.
TPM2B_NONCE original_nonce = session_nonce_;
EXPECT_EQ(delegate_.caller_nonce_.size, original_nonce.size);
EXPECT_EQ(0, memcmp(delegate_.caller_nonce_.buffer, original_nonce.buffer,
original_nonce.size));
// First we check that performing GetCommandAuthorization resets the nonce.
std::string command_hash;
std::string authorization;
TPMS_AUTH_COMMAND auth_command;
EXPECT_TRUE(delegate_.GetCommandAuthorization(command_hash, false, false,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS,
Parse_TPMS_AUTH_COMMAND(&authorization, &auth_command, nullptr));
EXPECT_EQ(delegate_.caller_nonce_.size, original_nonce.size);
EXPECT_EQ(auth_command.nonce.size, original_nonce.size);
EXPECT_NE(0, memcmp(delegate_.caller_nonce_.buffer, original_nonce.buffer,
original_nonce.size));
EXPECT_EQ(0, memcmp(delegate_.caller_nonce_.buffer, auth_command.nonce.buffer,
auth_command.nonce.size));
// Now we check that GetCommandAuthorization does not reset nonce
// when EncryptCommandParameter is called first.
original_nonce = delegate_.caller_nonce_;
std::string parameter;
EXPECT_TRUE(delegate_.EncryptCommandParameter(&parameter));
EXPECT_EQ(delegate_.caller_nonce_.size, original_nonce.size);
EXPECT_NE(0, memcmp(delegate_.caller_nonce_.buffer, original_nonce.buffer,
original_nonce.size));
EXPECT_TRUE(delegate_.nonce_generated_);
original_nonce = delegate_.caller_nonce_;
EXPECT_TRUE(delegate_.GetCommandAuthorization(command_hash, false, false,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS,
Parse_TPMS_AUTH_COMMAND(&authorization, &auth_command, nullptr));
EXPECT_EQ(delegate_.caller_nonce_.size, original_nonce.size);
EXPECT_EQ(auth_command.nonce.size, original_nonce.size);
EXPECT_EQ(0, memcmp(delegate_.caller_nonce_.buffer, original_nonce.buffer,
original_nonce.size));
EXPECT_EQ(0, memcmp(delegate_.caller_nonce_.buffer, auth_command.nonce.buffer,
auth_command.nonce.size));
}
TEST_F(HmacAuthorizationDelegateFixture, CommandAuthTest) {
std::string command_hash;
std::string authorization;
EXPECT_TRUE(delegate_.GetCommandAuthorization(command_hash, false, false,
&authorization));
TPMS_AUTH_COMMAND auth_command;
std::string auth_bytes;
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(auth_command.session_handle, session_handle_);
EXPECT_EQ(auth_command.nonce.size, session_nonce_.size);
EXPECT_EQ(kContinueSession, auth_command.session_attributes);
EXPECT_EQ(kHashDigestSize, auth_command.hmac.size);
}
TEST_F(HmacAuthorizationDelegateFixture, ResponseAuthTest) {
TPMS_AUTH_RESPONSE auth_response;
auth_response.session_attributes = kContinueSession;
auth_response.nonce.size = kAesKeySize;
memset(auth_response.nonce.buffer, 0, kAesKeySize);
auth_response.hmac.size = kHashDigestSize;
// TODO(usanghi): Use TCG TPM2.0 test vectors when available.
uint8_t hmac_buffer[kHashDigestSize] = {
0x37, 0x69, 0xaf, 0x12, 0xff, 0x4d, 0xbf, 0x44, 0xe5, 0x16, 0xa2,
0x2d, 0x1d, 0x05, 0x12, 0xe8, 0xbc, 0x42, 0x51, 0x6d, 0x59, 0xe8,
0xbf, 0x40, 0x1e, 0xa3, 0x46, 0xa4, 0xd6, 0x0d, 0xcc, 0xf7};
memcpy(auth_response.hmac.buffer, hmac_buffer, kHashDigestSize);
std::string response_hash;
std::string authorization;
EXPECT_EQ(TPM_RC_SUCCESS,
Serialize_TPMS_AUTH_RESPONSE(auth_response, &authorization));
EXPECT_TRUE(
delegate_.CheckResponseAuthorization(response_hash, authorization));
}
TEST_F(HmacAuthorizationDelegateFixture, SessionAttributes) {
const uint8_t kDecryptSession = 1 << 5;
const uint8_t kEncryptSession = 1 << 6;
// Encryption disabled and not possible for command.
std::string authorization;
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), false, false,
&authorization));
TPMS_AUTH_COMMAND auth_command;
std::string auth_bytes;
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession, auth_command.session_attributes);
// Encryption disabled and possible for command.
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), true, true,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession, auth_command.session_attributes);
// Encryption enabled and not possible for command.
ASSERT_TRUE(delegate_.InitSession(session_handle_,
session_nonce_, // TPM nonce.
session_nonce_, // Caller nonce.
std::string(), // Salt.
std::string(), // Bind auth value.
true)); // Enable encryption.
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), false, false,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession, auth_command.session_attributes);
// Encryption enabled and possible only for command input.
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), true, false,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession | kDecryptSession,
auth_command.session_attributes);
// Encryption enabled and possible only for command output.
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), false, true,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession | kEncryptSession,
auth_command.session_attributes);
// Encryption enabled and possible for command input and output.
EXPECT_TRUE(delegate_.GetCommandAuthorization(std::string(), true, true,
&authorization));
EXPECT_EQ(TPM_RC_SUCCESS, Parse_TPMS_AUTH_COMMAND(
&authorization, &auth_command, &auth_bytes));
EXPECT_EQ(kContinueSession | kEncryptSession | kDecryptSession,
auth_command.session_attributes);
}
} // namespace trunks