Federal Law 18 U.S.C δ 922(g) in brief, prohibits possession of any firearm or ammunition by anyone who:

• Has been convicted of a crime punishable by imprisonment for a term exceeding one year
• Has been discharged from the Armed Forces under dishonorable conditions
• Is subject to a court order restraining the person from harassing, stalking or threatening an intimate partner or child of an intimate partner
• Has been convicted in any court of a misdemeanor crime of domestic violence

Oregon law provides a few limits on where a person with an Oregon Concealed Handgun License (CHL) can carry a firearm, and federal law contains a few more prohibitions. Be aware that even if you have an Oregon Concealed Handgun License, you cannot carry a firearm on any of the following properties in Oregon:

• Federal Facilities: The term “Federal Facility” means a building or part thereof owned or leased by the Federal Government, where Federal employees are regularly present for the purpose of performing their official duties. Examples include: federal courthouses, social security offices, federal post offices, recruiting offices, in secured areas of airports and on airplanes. 18 U.S. Code § 930
• Airports: Past security checkpoint in airports. For questions regarding firearms in luggage, contact the Transportation Security Administration (TSA) or the airline you are traveling with.
• State Capitol Building
• Public Schools: signs posted prohibiting all firearms
• National Forests marked or posted by signs prohibiting all firearms
• Tribal Reservations or Tribal Property: The Tribal Council overseas the regulations on reservations. Firearm restrictions may vary greatly from reservation to reservation. Often you may not carry a firearm concealed without written permission by the Tribal Council. This also applies to casinos operated by tribes. For Confederated Tribes of the Umatilla Indian Reservation, contact the Tribal Police for more information at 541-278-0550.
• Court Facilities: You may not carry in a court facility, which is defined as any building occupied by a circuit court, the Court of Appeals, the Supreme Court or the Oregon Tax Court. This applies to the entire facility, not just areas adjacent to the courtrooms, including any area that may temporarily be set up as a court. You may be barred from entering a “local court facility” if the judge entered an order prohibiting firearms. A local court facility means the portion of a building in which a justice court, a municipal court, a probate court or a juvenile court conducts business. Intentional violation of this law is a Class C Felony. ORS 166.360 and ORS 166.370(s)(a) (the link applies to both ORS provided)
• Designated Wilderness Areas by specific declaration or order has enacted a restriction or prohibition of firearms.  Persons with a valid Oregon concealed handgun license may carry their weapon onto National Forest Service or Bureau of Land Management land UNLESS there is marked or posted signs prohibiting all firearms in accordance with a specific order.  It is the CHL holder’s responsibility to check on restrictions where you plan to visit. Restrictions are generally put into effect during festivals or large gatherings, or at popular recreation areas where there are safety concerns. Be aware that any Ranger Station or Visitors Center in any National Forest could be considered a Federal Building, making it illegal to carry there.
• Private property, business or facility where the owner prohibits firearm possession: Just as a person can prohibit you from possession of a firearm in their home, they can also prohibit firearms from their privately owned business. Some examples include: bars, nightclubs, stores, restaurants and movie theaters. If you are told to leave, you must do so, even if you have a CHL. If you remove your firearm and they still want you to leave, you must do so. If you don’t leave, you may be subject to arrest for Trespass.
• Umatilla County Jail: No person may bring a firearm, weapon or other contraband into the secure perimeter of the jail. Knowingly introducing contraband into a correctional facility is a Class C Felony.