Rif: Wargaming Rules for Morocco
Any small scale Colonial, WWI or WWII set of rules will do the trick. Check out Colonial Wargames: Rules or Major General Tremorden Rederring's Colonial-era Wargames Page: Rules for longer lists of Colonial period rules, but choices include:
Crossfire
My Spanish Civil War Crossfire variant for the WW2 game Crossfire.Disposable Heroes and Coffin for Seven Brothers
Iron Ivan Games has a Rif War supplement for their WW2 rules Disposable Heroes and Coffin for Seven Brothers called Harkas y Arma Blancas: Revised rules for The Rif War 1921-1927. There is also a scenario - "Death by Harka" which is available in the files section on their yahoo discussion group.
Charles Grants "Battle" rules
Richard Baber's group - see Society of Twentieth Century Wargamers (SOTCW) - uses a version of Charles Grants "Battle" rules which he first discovered in about 1976. They have added bits and pieces over the years (stolen from Command Decision & Rapid Fire! among others) for cavalry, aircraft, melee etc. But essentially they are the same rules as published in "Battle - Practical Wargaming". The rules scale a platoon to 9 figures (we modified this to 9-12 figures); 3 of these platoons for a company (we added a company CP of 4-6 figures too). This gives a company strength on the table top of around 30 - 40 figures, which allows us to play a nice 1:3 scaled game. They have played with actions on the table up to battalion strength with games (mini campaigns) running to Regiment and Brigade size using maps etc. We like the look and feel of these rules; because at this scale you can personalize the game and identify individual figures and during campaigns we have sometimes been able to "awarded medals or promotion" to certain characters which can improve their leadership rating which acts as a modifier Vs morale and in combat to their troops. The rules are not complicated and Richard's group use them for most periods 1900-1950s after which technology and airpower become too dominant.
Afriboria
The Antwerp Fusiliers:
"Afriboria" Fastplay Card Driven Colonial Wargame Rules and
associated Rudi Geudens: The Afriborian Campaign