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Updated Protocol Specification (markdown)

MaxXor 2020-06-05 18:38:18 +02:00
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Protocol-Specification.md

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## Overview ## Overview
The communication between the Quasar server and clients uses Transport Layer Security (TLS) with client & server certificates. TLS provides confidentiality and data integrity between the communicating components. TLS application data packets contain the exchanged messages between a client and server. The application data consists of a 2 bytes unsigned message length and a serialized message. The communication between the Quasar server and clients uses Transport Layer Security (TLS) with client & server certificates. TLS provides confidentiality and data integrity between the communicating components. TLS application data packets contain the exchanged messages between a client and server. The application data consists of a 4 bytes unsigned message length and a serialized message. Although a message length of 4 bytes results in a maximum message length of 2³² bytes, a lower limit of 5 MB is enforced on the client and server side to prevent huge buffer allocation attacks from exhausting the resources of a client or server.
``` ```
--------------------------------------------------------------------- ---------------------------------------------------------------------
| | | |
| TLS application data | | TLS application data |
| ----------------------------------------------------------- | | ----------------------------------------------------------- |
| | 2 bytes | x bytes | | | | 4 bytes | x bytes | |
| | message length (= x) | serialized message | | | | message length | serialized message | |
| ----------------------------------------------------------- | | ----------------------------------------------------------- |
-------------------------------------------------------------------- --------------------------------------------------------------------
``` ```