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Limit JSON-RPC message size

This commit is contained in:
Noah Hilverling 2018-03-01 09:47:29 +01:00 committed by Gunnar Beutner
parent d23c03bfa5
commit 54ff60cd8c
5 changed files with 20 additions and 6 deletions
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10
lib/base/netstring.cpp
View File

@ -32,7 +32,8 @@ using namespace icinga;
* @exception invalid_argument The input stream is invalid.
* @see https://github.com/PeterScott/netstring-c/blob/master/netstring.c
*/
StreamReadStatus NetString::ReadStringFromStream(const Stream::Ptr& stream, String *str, StreamReadContext& context, bool may_wait)
StreamReadStatus NetString::ReadStringFromStream(const Stream::Ptr& stream, String *str, StreamReadContext& context,
bool may_wait, ssize_t maxMessageLength)
{
if (context.Eof)
return StatusEof;
@ -84,6 +85,13 @@ StreamReadStatus NetString::ReadStringFromStream(const Stream::Ptr& stream, Stri
/* read the whole message */
size_t data_length = len + 1;
if (maxMessageLength >= 0 && data_length > maxMessageLength) {
std::stringstream errorMessage;
errorMessage << "Max data length exceeded: " << (maxMessageLength / 1024 / 1024) << " MB";
BOOST_THROW_EXCEPTION(std::invalid_argument(errorMessage.str()));
}
char *data = context.Buffer + header_length + 1;
if (context.Size < header_length + 1 + data_length) {

3
lib/base/netstring.hpp
View File

@ -38,7 +38,8 @@ class String;
class NetString
{
public:
static StreamReadStatus ReadStringFromStream(const Stream::Ptr& stream, String *message, StreamReadContext& context, bool may_wait = false);
static StreamReadStatus ReadStringFromStream(const Stream::Ptr& stream, String *message, StreamReadContext& context,
bool may_wait = false, ssize_t maxMessageLength = -1);
static size_t WriteStringToStream(const Stream::Ptr& stream, const String& message);
static void WriteStringToStream(std::ostream& stream, const String& message);

4
lib/remote/jsonrpc.cpp
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@ -72,10 +72,10 @@ size_t JsonRpc::SendMessage(const Stream::Ptr& stream, const Dictionary::Ptr& me
return NetString::WriteStringToStream(stream, json);
}
StreamReadStatus JsonRpc::ReadMessage(const Stream::Ptr& stream, String *message, StreamReadContext& src, bool may_wait)
StreamReadStatus JsonRpc::ReadMessage(const Stream::Ptr& stream, String *message, StreamReadContext& src, bool may_wait, size_t maxMessageLength)
{
String jsonString;
StreamReadStatus srs = NetString::ReadStringFromStream(stream, &jsonString, src, may_wait);
StreamReadStatus srs = NetString::ReadStringFromStream(stream, &jsonString, src, may_wait, maxMessageLength);
if (srs != StatusNewItem)
return srs;

2
lib/remote/jsonrpc.hpp
View File

@ -36,7 +36,7 @@ class JsonRpc
{
public:
static size_t SendMessage(const Stream::Ptr& stream, const Dictionary::Ptr& message);
static StreamReadStatus ReadMessage(const Stream::Ptr& stream, String *message, StreamReadContext& src, bool may_wait = false);
static StreamReadStatus ReadMessage(const Stream::Ptr& stream, String *message, StreamReadContext& src, bool may_wait = false, size_t maxMessageLength = -1);
static Dictionary::Ptr DecodeMessage(const String& message);
private:

7
lib/remote/jsonrpcconnection.cpp
View File

@ -250,9 +250,14 @@ void JsonRpcConnection::MessageHandler(const String& jsonString)
bool JsonRpcConnection::ProcessMessage()
{
ssize_t maxMessageLength = 64 * 1024;
if (m_Endpoint)
maxMessageLength = -1; /* no limit */
String message;
StreamReadStatus srs = JsonRpc::ReadMessage(m_Stream, &message, m_Context, false);
StreamReadStatus srs = JsonRpc::ReadMessage(m_Stream, &message, m_Context, false, maxMessageLength);
if (srs != StatusNewItem)
return false;