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Limit JSON-RPC message size

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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
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@ -32,7 +32,8 @@ using namespace icinga;
* @exception invalid_argument The input stream is invalid. * @exception invalid_argument The input stream is invalid.
* @see https://github.com/PeterScott/netstring-c/blob/master/netstring.c * @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) if (context.Eof)
return StatusEof; return StatusEof;
@ -84,6 +85,13 @@ StreamReadStatus NetString::ReadStringFromStream(const Stream::Ptr& stream, Stri
/* read the whole message */ /* read the whole message */
size_t data_length = len + 1; 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; char *data = context.Buffer + header_length + 1;
if (context.Size < header_length + 1 + data_length) { if (context.Size < header_length + 1 + data_length) {

3
lib/base/netstring.hpp
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@ -38,7 +38,8 @@ class String;
class NetString class NetString
{ {
public: 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 size_t WriteStringToStream(const Stream::Ptr& stream, const String& message);
static void WriteStringToStream(std::ostream& 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); 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; String jsonString;
StreamReadStatus srs = NetString::ReadStringFromStream(stream, &jsonString, src, may_wait); StreamReadStatus srs = NetString::ReadStringFromStream(stream, &jsonString, src, may_wait, maxMessageLength);
if (srs != StatusNewItem) if (srs != StatusNewItem)
return srs; return srs;

2
lib/remote/jsonrpc.hpp
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@ -36,7 +36,7 @@ class JsonRpc
{ {
public: public:
static size_t SendMessage(const Stream::Ptr& stream, const Dictionary::Ptr& message); 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); static Dictionary::Ptr DecodeMessage(const String& message);
private: private:

7
lib/remote/jsonrpcconnection.cpp
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@ -250,9 +250,14 @@ void JsonRpcConnection::MessageHandler(const String& jsonString)
bool JsonRpcConnection::ProcessMessage() bool JsonRpcConnection::ProcessMessage()
{ {
ssize_t maxMessageLength = 64 * 1024;
if (m_Endpoint)
maxMessageLength = -1; /* no limit */
String message; 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) if (srs != StatusNewItem)
return false; return false;