Her line from the RNC convention:

Al Qaida terrorists still plot to inflict catastrophic harm on America, and [Obama is] worried that someone won’t read them their rights.

Factcheck.org:

Obama isn’t worried, as Palin said, "that someone won’t read them their rights" when it comes to suspected terrorists who are detained by the U.S. He does, however, support the right of detainees to challenge their imprisonment in federal court. That’s the same position the Supreme Court took in June in a case called Boumediene v. Bush.