It's certainly safe...you're going boil it an hour anyhow! Yeah, I'd toss the hops and yeast. I'm sure the candi sugar is perfectly fine. The LME is a bigger question mark, but if it's well sealed it is probably okay.
Brew it up, it's worth gambling a few ounces of hops and some yeast. Maybe harvest some yeast from another batch, if you don't want to gamble the price of a new smack pack.