Financial aid is generally not available for undocumented students and illegal aliens. The majority of all student aid, including Federal student aid, requires the recipient to be a US citizen or permanent resident (green card holder) or an eligible non-citizen. There are, however, a few states that allow undocumented students to qualify for in-state tuition rates. There are also several private scholarships available to undocumented students.
Find more on Fastweb: Resources for Undocumented Students.