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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/cert/ct_log_response_parser.h"
#include <memory>
#include <string>
#include <string_view>
#include "base/base64.h"
#include "base/containers/span.h"
#include "base/json/json_reader.h"
#include "base/time/time.h"
#include "base/values.h"
#include "net/cert/ct_serialization.h"
#include "net/cert/signed_tree_head.h"
#include "net/test/ct_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net::ct {
TEST(CTLogResponseParserTest, ParsesValidJsonSTH) {
std::optional<base::Value> sample_sth_json =
base::JSONReader::Read(GetSampleSTHAsJson());
SignedTreeHead tree_head;
EXPECT_TRUE(FillSignedTreeHead(*sample_sth_json, &tree_head));
SignedTreeHead sample_sth;
ASSERT_TRUE(GetSampleSignedTreeHead(&sample_sth));
ASSERT_EQ(SignedTreeHead::V1, tree_head.version);
ASSERT_EQ(sample_sth.timestamp, tree_head.timestamp);
ASSERT_EQ(sample_sth.tree_size, tree_head.tree_size);
// Copy the field from the SignedTreeHead because it's not null terminated
// there and ASSERT_STREQ expects null-terminated strings.
char actual_hash[kSthRootHashLength + 1];
base::as_writable_byte_span(actual_hash)
.first(kSthRootHashLength)
.copy_from(base::as_byte_span(tree_head.sha256_root_hash));
actual_hash[kSthRootHashLength] = '\0';
std::string expected_sha256_root_hash = GetSampleSTHSHA256RootHash();
ASSERT_STREQ(expected_sha256_root_hash.c_str(), actual_hash);
const DigitallySigned& expected_signature(sample_sth.signature);
ASSERT_EQ(tree_head.signature.hash_algorithm,
expected_signature.hash_algorithm);
ASSERT_EQ(tree_head.signature.signature_algorithm,
expected_signature.signature_algorithm);
ASSERT_EQ(tree_head.signature.signature_data,
expected_signature.signature_data);
}
TEST(CTLogResponseParserTest, FailsToParseMissingFields) {
std::optional<base::Value> missing_signature_sth = base::JSONReader::Read(
CreateSignedTreeHeadJsonString(1 /* tree_size */, 123456u /* timestamp */,
GetSampleSTHSHA256RootHash(), ""));
SignedTreeHead tree_head;
ASSERT_FALSE(FillSignedTreeHead(*missing_signature_sth, &tree_head));
std::optional<base::Value> missing_root_hash_sth = base::JSONReader::Read(
CreateSignedTreeHeadJsonString(1 /* tree_size */, 123456u /* timestamp */,
"", GetSampleSTHTreeHeadSignature()));
ASSERT_FALSE(FillSignedTreeHead(*missing_root_hash_sth, &tree_head));
}
TEST(CTLogResponseParserTest, FailsToParseIncorrectLengthRootHash) {
SignedTreeHead tree_head;
std::string too_long_hash;
base::Base64Decode(
std::string_view("/WHFMgXtI/umKKuACJIN0Bb73TcILm9WkeU6qszvoArK\n"),
&too_long_hash);
std::optional<base::Value> too_long_hash_json =
base::JSONReader::Read(CreateSignedTreeHeadJsonString(
1 /* tree_size */, 123456u /* timestamp */,
GetSampleSTHSHA256RootHash(), too_long_hash));
ASSERT_FALSE(FillSignedTreeHead(*too_long_hash_json, &tree_head));
std::string too_short_hash;
base::Base64Decode(
std::string_view("/WHFMgXtI/umKKuACJIN0Bb73TcILm9WkeU6qszvoA==\n"),
&too_short_hash);
std::optional<base::Value> too_short_hash_json =
base::JSONReader::Read(CreateSignedTreeHeadJsonString(
1 /* tree_size */, 123456u /* timestamp */,
GetSampleSTHSHA256RootHash(), too_short_hash));
ASSERT_FALSE(FillSignedTreeHead(*too_short_hash_json, &tree_head));
}
TEST(CTLogResponseParserTest, ParsesJsonSTHWithLargeTimestamp) {
SignedTreeHead tree_head;
std::optional<base::Value> large_timestamp_json =
base::JSONReader::Read(CreateSignedTreeHeadJsonString(
100, INT64_C(1) << 34, GetSampleSTHSHA256RootHash(),
GetSampleSTHTreeHeadSignature()));
ASSERT_TRUE(FillSignedTreeHead(*large_timestamp_json, &tree_head));
base::Time expected_time =
base::Time::UnixEpoch() + base::Milliseconds(INT64_C(1) << 34);
EXPECT_EQ(tree_head.timestamp, expected_time);
}
TEST(CTLogResponseParserTest, ParsesConsistencyProofSuccessfully) {
std::string first(32, 'a');
std::string second(32, 'b');
std::string third(32, 'c');
std::vector<std::string> raw_nodes;
raw_nodes.push_back(first);
raw_nodes.push_back(second);
raw_nodes.push_back(third);
std::optional<base::Value> sample_consistency_proof =
base::JSONReader::Read(CreateConsistencyProofJsonString(raw_nodes));
std::vector<std::string> output;
ASSERT_TRUE(FillConsistencyProof(*sample_consistency_proof, &output));
EXPECT_EQ(output[0], first);
EXPECT_EQ(output[1], second);
EXPECT_EQ(output[2], third);
}
TEST(CTLogResponseParserTest, FailsOnInvalidProofJson) {
std::vector<std::string> output;
std::optional<base::Value> badly_encoded =
base::JSONReader::Read(std::string("{\"consistency\": [\"notbase64\"]}"));
EXPECT_FALSE(FillConsistencyProof(*badly_encoded, &output));
std::optional<base::Value> not_a_string =
base::JSONReader::Read(std::string("{\"consistency\": [42, 16]}"));
EXPECT_FALSE(FillConsistencyProof(*badly_encoded, &output));
std::optional<base::Value> missing_consistency =
base::JSONReader::Read(std::string("{}"));
EXPECT_FALSE(FillConsistencyProof(*missing_consistency, &output));
std::optional<base::Value> not_a_dict =
base::JSONReader::Read(std::string("[]"));
EXPECT_FALSE(FillConsistencyProof(*not_a_dict, &output));
}
TEST(CTLogResponseParserTest, ParsesProofJsonWithExtraFields) {
std::vector<std::string> output;
std::optional<base::Value> badly_encoded = base::JSONReader::Read(
std::string("{\"consistency\": [], \"somethingelse\": 3}"));
EXPECT_TRUE(FillConsistencyProof(*badly_encoded, &output));
}
} // namespace net::ct
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