It is natural, independent of government. There are no positive rights. Our mutual agreement to surrender part of our liberty to the government is the social contract. You cannot surrender them. Slavery would be wrong even if you submitted to it voluntarily.
All substantive rights are general rights, rights against interference.
There are positive rights, but they are procedural, stemming from government's obligation to be impartial. Government derives its power from the rights of individuals. The rights of individuals derive from the power of government. The social contract gives us the benefits of cooperation and leads us to equality. There are positive as well as general substantive rights.