[cifs-protocol] [MS-DTYP] Conditional ACE Unicode literal SDDL format

[Douglas Bagnall]

hi Dochelp,

I am interested in the details of the format for conditional ACE SDDL format, 
which is not really described in [MS-DTYP] (unlike the wire format).

 From the examples, it is clear that it involves double-quote delimiters:

    (Title=="VP")

But how are escapes handled -- how would it handle a string that itself 
contained a double quote?

In the ABNF there is a thing called "char-string":

    char-string = DQUOTE *(CHAR) DQUOTE

which we can deduce applies to Unicode strings due to the definition of 
value-array, but this doesn't answer the question. Rather, it expands it, since 
RFC5234 says CHAR is 7-bit ASCII only, precluding most Unicode values, so there 
must be an escaping mechanism for these characters too (unless the use of CHAR 
is mistaken).

My guess is that Unicode strings the same %hhhh sequence as attr-char2 (encoding 
the double quote as %0022), but there is no mention of that.

cheers,
Douglas