[Samba] Valid characters in NT user/pass, wbinfo -a

[daniel.jarboe at custserv.com]

Samba 2.2.6.  I've been looking for (without success) a doc that 
specifies what characters are valid in an NT login/password.  A script 
will popen  '/usr/bin/wbinfo -a MY_DOMAIN+"'+user+'"%"'+passw+'"' where 
user and passw are untrusted submitted values, so you can understand my 
concern.  I want to keep things tight but not reject valid user/pass 
combinations.

Thanks for any help,
~ Daniel

p.s.  i've google'd and searched the archives at marc.theaimsgroup, but 
turning up a LOT of false positives.