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Re: How to correctly escape search filters

> I've been trying to research how to correctly escape search filters, and I
> can't find any single
> reliable source that makes sense.
> I look at RFC 2253 (http://www.ietf.org/rfc/rfc2253.txt) section 2.4,
> and this IBM webpage (
> http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/rzahy/rzahyunderdn.htm
> ),
> and they both seem to suggest that you need to escape (for example) the
> '+'
> sign.
> But when I escape a search filter like this:
> (&(objectclass=person)(facsimileTelephoneNumber=+1234))
> to this:
> (&(objectclass=person)(facsimileTelephoneNumber=\+1234))
> it results in a bad filter.
> My hunch is that perhaps DNs, attribute names, and attribute values are
> all
> escaped different.
> Is there a simple explanation online on how to escape search filters?

RFC2253 was about string representation of DN, not filters.  RFC2254 was
about search filters.  They are both deprecated.  See RFC4510 for a list
of RFCs related to the current specification of LDAP.  In any case, '+'
does not need any escaping in search filters.  Escaping requires '\' +
two-digit hex representation of escaped octet; in your case, '\2B'.