The short answer to this question is... Yes. There are, at this time, no specific laws against playing poker on the internet. This doesn't necessary make it legal, it simply makes it not illegal. The standard rules apply, as they do to every form of gambling.
- You need to be of legal age for your province to participate
- You need to be of legal age for the poker room you are playing at
- The majority of poker rooms on the internet protect themselves with a legality clause. Here is an example taken from Party Poker:
You may only participate in the Games if you are over 18 years of age and it is legal for you to do so according to the laws that apply in the jurisdiction from where you are connecting. You understand and accept that Company is unable to provide you any legal advice or assurances and that it is your sole responsibility to ensure that at all times you comply with the laws that govern you and that you have complete legal right to play the Games. Participation in the Games is void for whomever and/or wherever prohibited by law.
This basically states that it is your responsibility as a player to determine if it is legal in your area to play.