:Summon Monster 1, third paragraph:
When you use a summoning spell to summon an air, chaotic, earth, evil, fire, good, lawful, or water creature, it is a spell of that type. For example, Summon Monster I is a lawful and evil spell when cast summon a dire rat.
But that's not really the issue at hand. Read PfE and it says:
Good elementals and outsiders are immune to this effect
Protection from Good says:
As Protection from Evil...and good summoned or conjured creatures cannot touch the subject.
I would say this implies that evil ones can, but only evil creatures.
The problem is that if it protects from neutral creatures, than all of the Protection from - spells will too (a big problem for poor druids who can only summon neutral creatures). Conversely, if it doesnt, then none of them will.
Either way, it's not based on the caster, it's based on the summoned creature.
It should also be noted that if the summoned creature has SR, the caster of the Protection from - has to beat it to gain the special protection noted above.
It should also be noted that these spells only protect against natural weapon attacks (specifically, bodily contact). So if the summoned creature picks up a weapon, or has a ranged attack, it can still attack with those.
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