Checks to see if the supplied hostname matches any of the supplied CNs
or "DNS" Subject-Alts. Most implementations only look at the first CN,
and ignore any additional CNs. Most implementations do look at all of
the "DNS" Subject-Alts. The CNs or Subject-Alts may contain wildcards
according to RFC 2818.
host - The hostname to verify.
cns - CN fields, in order, as extracted from the X.509
subjectAlts - Subject-Alt fields of type 2 ("DNS"), as extracted
from the X.509 certificate.