fix SNI wildcard matching #16
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The current code is using fnmatch(3) which allows a wildcard to match multiple DNS labels. e.g. *.domain.tld matches foo.bar.domain.tld. This is incorrect. According to the RFC a wildcard can at most match one DNS label (only bar.domain.tld in the example above). For OpenSSL 1.0.2 and above we make use of X509_check_host(). For older versions we check the left most DNS label only, which is the same Apache currently supports.
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The current code is using fnmatch(3) which allows a wildcard to match
multiple DNS labels. e.g. *.domain.tld matches foo.bar.domain.tld. This
is incorrect. According to the RFC a wildcard can at most match one DNS
label (only bar.domain.tld in the example above).
For OpenSSL 1.0.2 and above we make use of X509_check_host(). For older
versions we check the left most DNS label only, which is the same Apache
currently supports.