I've looked into the combat log to find out about the actual rolls, but while I could find the damage rolls, I couldn't find the to-hit rolls. Aren't they shown somewhere?
Both the attack and dmg rolls are listed in the combat log. Generally, there are two sentence - the first one says whether you hit or miss. If you mouse over, it tells you the Armour Class of the character being attacked, and it also states your modifiers of your Attack Rolls and what your total Attack Roll is. The second one says how much dmg you have dealt. If you mouse over, it tells you your Dmg Roll.
