(ITS#5368) s/strncasecmp/ber_bvstrncasecmp/ broke substring check for {CLEARTEXT}

Full_Name: Steve Langasek Version: 2.4.7 OS: Debian URL: http://people.ubuntu.com/~vorlon/sasl-cleartext-strncasecmp.patch Submission from: (NULL) (2001:4830:1244:0:219:d2ff:fe76:2acb)

A regression was introduced in revision 1.239 of servers/slapd/sasl.c. Previously, sasl_ap_lookup() would check for a leading string of {CLEARTEXT} and trim it from the userPassword value returned to SASL; but in revision 1.239, the strncasecmp() was replaced with ber_bvstrcasecmp() which instead looks for an exact match of the whole string, causing passwords to be handed back to SASL with the leading "{CLEARTEXT}" attached.

The referenced patch is verified to correct this regression.