CCW is not illegal on campus.
They can ask you to leave, and then if you don't...trespassing.
However, if you are a student or an employee you could be subject to disciplinary action (read as fired or expelled) by the University.
So yes, effectively it is banned. Who wants to put in a few years of work, and then get expelled without getting your degree. Then again, who wants to be lined up against a wall and executed?
If I loose my job I can get another.
If I am thrown out of school after investing three years in an enginering degree I am now out a large sum of money that I cannot earn back since I HAVE NO DEGREE!!! The student who is paying his own way is at a severe disadvantage here.