You may not work in Canada unless a work permit or the regulations themselves say you can. Short, and the whole temporary worker regime hangs off it. The list of work that needs no permit at all is in 186.
196.1 A foreign national must not enter into an employment agreement, or extend the term of an employment agreement, with an employer (a)who, on a regular basis, offers striptease, erotic dance, escort services or erotic massages; or (b)referred to in subparagraph 200(3)(h)(ii) or (iii).
196.2 (1) For the purpose of this Part abuse consists of any of the following: (a)physical abuse, including assault and forcible confinement; (b)sexual abuse, including sexual contact without consent; (c)psychological abuse, including threats and intimidation; (d)financial abuse, including fraud and extortion; and (e)reprisals. (2) For the purpose of subsection (1) reprisal consists of any measure, including the following, that is taken by or on behalf of an employer against a foreign national referred to in subparagraph 200(1)(c)(ii.1) or (iii) – and that adversely affects the foreign national’s employment or working conditions – because the foreign national has reported that the conditions set out in section 209.2 or 209.3 have not been complied with or has in good faith cooperated with an inspection conducted under section 209.7, 209.8 or 209.9: (a)a disciplinary measure; (b)a demotion; (c)a dismissal; or (d)any threat to take any of the measures mentioned above.