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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_SUBRESOURCE_INTEGRITY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_SUBRESOURCE_INTEGRITY_H_
#include "base/gtest_prod_util.h"
#include "third_party/blink/renderer/platform/loader/fetch/integrity_metadata.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class KURL;
class Resource;
class PLATFORM_EXPORT SubresourceIntegrity final {
STATIC_ONLY(SubresourceIntegrity);
public:
class PLATFORM_EXPORT ReportInfo final {
public:
enum class UseCounterFeature {
kSRIElementWithMatchingIntegrityAttribute,
kSRIElementWithNonMatchingIntegrityAttribute,
kSRIElementIntegrityAttributeButIneligible,
kSRIElementWithUnparsableIntegrityAttribute,
kSRISignatureCheck,
kSRISignatureSuccess,
};
void AddUseCount(UseCounterFeature);
void AddConsoleErrorMessage(const String&);
void Clear();
const Vector<UseCounterFeature>& UseCounts() const { return use_counts_; }
const Vector<String>& ConsoleErrorMessages() const {
return console_error_messages_;
}
private:
Vector<UseCounterFeature> use_counts_;
Vector<String> console_error_messages_;
};
enum IntegrityParseResult {
kIntegrityParseValidResult,
kIntegrityParseNoValidResult
};
// Determine which SRI features to support when parsing integrity attributes.
enum class IntegrityFeatures {
kDefault, // Default: All sha* hash codes.
kSignatures // Also support the ed25519 signature scheme.
};
// The version with the IntegrityMetadataSet passed as the first argument
// assumes that the integrity attribute has already been parsed, and the
// IntegrityMetadataSet represents the result of that parsing.
static bool CheckSubresourceIntegrity(const IntegrityMetadataSet&,
const char* content,
size_t content_size,
const KURL& resource_url,
const Resource&,
ReportInfo&);
static bool CheckSubresourceIntegrity(const String&,
IntegrityFeatures,
const char* content,
size_t content_size,
const KURL& resource_url,
ReportInfo&);
// The IntegrityMetadataSet arguments are out parameters which contain the
// set of all valid, parsed metadata from |attribute|.
static IntegrityParseResult ParseIntegrityAttribute(
const WTF::String& attribute,
IntegrityFeatures,
IntegrityMetadataSet&);
static IntegrityParseResult ParseIntegrityAttribute(
const WTF::String& attribute,
IntegrityFeatures,
IntegrityMetadataSet&,
ReportInfo*);
private:
friend class SubresourceIntegrityTest;
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest, Parsing);
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest, ParseAlgorithm);
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest, ParseHeader);
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest, Prioritization);
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest, FindBestAlgorithm);
FRIEND_TEST_ALL_PREFIXES(SubresourceIntegrityTest,
GetCheckFunctionForAlgorithm);
// The core implementation for all CheckSubresoureIntegrity functions.
static bool CheckSubresourceIntegrityImpl(const IntegrityMetadataSet&,
const char*,
size_t,
const KURL& resource_url,
const String integrity_header,
ReportInfo&);
enum AlgorithmParseResult {
kAlgorithmValid,
kAlgorithmUnparsable,
kAlgorithmUnknown
};
static IntegrityAlgorithm FindBestAlgorithm(const IntegrityMetadataSet&);
typedef bool (*CheckFunction)(const IntegrityMetadata&,
const char*,
size_t,
const String&);
static CheckFunction GetCheckFunctionForAlgorithm(IntegrityAlgorithm);
static bool CheckSubresourceIntegrityDigest(const IntegrityMetadata&,
const char*,
size_t,
const String& integrity_header);
static bool CheckSubresourceIntegritySignature(
const IntegrityMetadata&,
const char*,
size_t,
const String& integrity_header);
static AlgorithmParseResult ParseAttributeAlgorithm(const UChar*& begin,
const UChar* end,
IntegrityFeatures,
IntegrityAlgorithm&);
static AlgorithmParseResult ParseIntegrityHeaderAlgorithm(
const UChar*& begin,
const UChar* end,
IntegrityAlgorithm&);
typedef std::pair<const char*, IntegrityAlgorithm> AlgorithmPrefixPair;
static AlgorithmParseResult ParseAlgorithmPrefix(
const UChar*& string_position,
const UChar* string_end,
const AlgorithmPrefixPair* prefix_table,
size_t prefix_table_size,
IntegrityAlgorithm&);
static bool ParseDigest(const UChar*& begin,
const UChar* end,
String& digest);
};
} // namespace blink
#endif
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