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//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef ProtocolParser_h__
#define ProtocolParser_h__
#include "HashStore.h"
#include "nsICryptoHMAC.h"
#include "safebrowsing.pb.h"
namespace mozilla {
namespace safebrowsing {
/**
* Abstract base class for parsing update data in multiple formats.
*/
class ProtocolParser {
public:
struct ForwardedUpdate {
nsCString table;
nsCString url;
};
ProtocolParser();
virtual ~ProtocolParser();
nsresult Status() const { return mUpdateStatus; }
nsresult Init(nsICryptoHash* aHasher);
#ifdef MOZ_SAFEBROWSING_DUMP_FAILED_UPDATES
nsCString GetRawTableUpdates() const { return mPending; }
#endif
virtual void SetCurrentTable(const nsACString& aTable) = 0;
void SetRequestedTables(const nsTArray<nsCString>& aRequestTables)
{
mRequestedTables = aRequestTables;
}
nsresult Begin();
virtual nsresult AppendStream(const nsACString& aData) = 0;
uint32_t UpdateWaitSec() { return mUpdateWaitSec; }
// Notify that the inbound data is ready for parsing if progressive
// parsing is not supported, for example in V4.
virtual void End() = 0;
// Forget the table updates that were created by this pass. It
// becomes the caller's responsibility to free them. This is shitty.
TableUpdate *GetTableUpdate(const nsACString& aTable);
void ForgetTableUpdates() { mTableUpdates.Clear(); }
nsTArray<TableUpdate*> &GetTableUpdates() { return mTableUpdates; }
// These are only meaningful to V2. Since they were originally public,
// moving them to ProtocolParserV2 requires a dymamic cast in the call
// sites. As a result, we will leave them until we remove support
// for V2 entirely..
virtual const nsTArray<ForwardedUpdate> &Forwards() const { return mForwards; }
virtual bool ResetRequested() { return false; }
protected:
virtual TableUpdate* CreateTableUpdate(const nsACString& aTableName) const = 0;
nsCString mPending;
nsresult mUpdateStatus;
// Keep track of updates to apply before passing them to the DBServiceWorkers.
nsTArray<TableUpdate*> mTableUpdates;
nsTArray<ForwardedUpdate> mForwards;
nsCOMPtr<nsICryptoHash> mCryptoHash;
// The table names that were requested from the client.
nsTArray<nsCString> mRequestedTables;
// How long we should wait until the next update.
uint32_t mUpdateWaitSec;
private:
void CleanupUpdates();
};
/**
* Helpers to parse the "shavar", "digest256" and "simple" list formats.
*/
class ProtocolParserV2 final : public ProtocolParser {
public:
ProtocolParserV2();
virtual ~ProtocolParserV2();
virtual void SetCurrentTable(const nsACString& aTable) override;
virtual nsresult AppendStream(const nsACString& aData) override;
virtual void End() override;
// Update information.
virtual const nsTArray<ForwardedUpdate> &Forwards() const override { return mForwards; }
virtual bool ResetRequested() override { return mResetRequested; }
private:
virtual TableUpdate* CreateTableUpdate(const nsACString& aTableName) const override;
nsresult ProcessControl(bool* aDone);
nsresult ProcessExpirations(const nsCString& aLine);
nsresult ProcessChunkControl(const nsCString& aLine);
nsresult ProcessForward(const nsCString& aLine);
nsresult AddForward(const nsACString& aUrl);
nsresult ProcessChunk(bool* done);
// Remove this, it's only used for testing
nsresult ProcessPlaintextChunk(const nsACString& aChunk);
nsresult ProcessShaChunk(const nsACString& aChunk);
nsresult ProcessHostAdd(const Prefix& aDomain, uint8_t aNumEntries,
const nsACString& aChunk, uint32_t* aStart);
nsresult ProcessHostSub(const Prefix& aDomain, uint8_t aNumEntries,
const nsACString& aChunk, uint32_t* aStart);
nsresult ProcessHostAddComplete(uint8_t aNumEntries, const nsACString& aChunk,
uint32_t *aStart);
nsresult ProcessHostSubComplete(uint8_t numEntries, const nsACString& aChunk,
uint32_t* start);
// Digest chunks are very similar to shavar chunks, except digest chunks
// always contain the full hash, so there is no need for chunk data to
// contain prefix sizes.
nsresult ProcessDigestChunk(const nsACString& aChunk);
nsresult ProcessDigestAdd(const nsACString& aChunk);
nsresult ProcessDigestSub(const nsACString& aChunk);
bool NextLine(nsACString& aLine);
enum ParserState {
PROTOCOL_STATE_CONTROL,
PROTOCOL_STATE_CHUNK
};
ParserState mState;
enum ChunkType {
// Types for shavar tables.
CHUNK_ADD,
CHUNK_SUB,
// Types for digest256 tables. digest256 tables differ in format from
// shavar tables since they only contain complete hashes.
CHUNK_ADD_DIGEST,
CHUNK_SUB_DIGEST
};
struct ChunkState {
ChunkType type;
uint32_t num;
uint32_t hashSize;
uint32_t length;
void Clear() { num = 0; hashSize = 0; length = 0; }
};
ChunkState mChunkState;
bool mResetRequested;
// Updates to apply to the current table being parsed.
TableUpdateV2 *mTableUpdate;
};
// Helpers to parse the "proto" list format.
class ProtocolParserProtobuf final : public ProtocolParser {
public:
typedef FetchThreatListUpdatesResponse_ListUpdateResponse ListUpdateResponse;
typedef google::protobuf::RepeatedPtrField<ThreatEntrySet> ThreatEntrySetList;
public:
ProtocolParserProtobuf();
virtual void SetCurrentTable(const nsACString& aTable) override;
virtual nsresult AppendStream(const nsACString& aData) override;
virtual void End() override;
private:
virtual ~ProtocolParserProtobuf();
virtual TableUpdate* CreateTableUpdate(const nsACString& aTableName) const override;
// For parsing update info.
nsresult ProcessOneResponse(const ListUpdateResponse& aResponse);
nsresult ProcessAdditionOrRemoval(TableUpdateV4& aTableUpdate,
const ThreatEntrySetList& aUpdate,
bool aIsAddition);
nsresult ProcessRawAddition(TableUpdateV4& aTableUpdate,
const ThreatEntrySet& aAddition);
nsresult ProcessRawRemoval(TableUpdateV4& aTableUpdate,
const ThreatEntrySet& aRemoval);
nsresult ProcessEncodedAddition(TableUpdateV4& aTableUpdate,
const ThreatEntrySet& aAddition);
nsresult ProcessEncodedRemoval(TableUpdateV4& aTableUpdate,
const ThreatEntrySet& aRemoval);
};
} // namespace safebrowsing
} // namespace mozilla
#endif
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