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For current policies and regulations concerning camping, please check with the National Park Service at https://www.nps.gov/index.htm. Some policies and regulations vary from park to park so we suggest that you also check that park's web site.
I don't know if this is what you are looking for but you can search the Code of Federal Regulations. The NPS is Title 36. Here is a link to a "camping" search for your reference; eCFR — Code of Federal Regulations.
It is not a simple list of the ordinances. Because what you are looking for may be covered under general rules, or park specific rules. It may also not have a specific parks specific policy. The NPS does have a specific points of contacts for Laws, Policies & Regulations (U.S. National Park Service) .