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52 lines
1.8 KiB
Text
52 lines
1.8 KiB
Text
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The ssl.match_hostname() function from Python 3.4
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=================================================
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The Secure Sockets layer is only actually *secure*
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if you check the hostname in the certificate returned
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by the server to which you are connecting,
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and verify that it matches to hostname
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that you are trying to reach.
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But the matching logic, defined in `RFC2818`_,
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can be a bit tricky to implement on your own.
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So the ``ssl`` package in the Standard Library of Python 3.2
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and greater now includes a ``match_hostname()`` function
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for performing this check instead of requiring every application
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to implement the check separately.
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This backport brings ``match_hostname()`` to users
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of earlier versions of Python.
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Simply make this distribution a dependency of your package,
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and then use it like this::
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from backports.ssl_match_hostname import match_hostname, CertificateError
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...
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sslsock = ssl.wrap_socket(sock, ssl_version=ssl.PROTOCOL_SSLv3,
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cert_reqs=ssl.CERT_REQUIRED, ca_certs=...)
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try:
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match_hostname(sslsock.getpeercert(), hostname)
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except CertificateError, ce:
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...
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Note that the ``ssl`` module is only included in the Standard Library
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for Python 2.6 and later;
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users of Python 2.5 or earlier versions
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will also need to install the ``ssl`` distribution
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from the Python Package Index to use code like that shown above.
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Brandon Craig Rhodes is merely the packager of this distribution;
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the actual code inside comes verbatim from Python 3.4.
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History
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-------
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* This function was introduced in python-3.2
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* It was updated for python-3.4a1 for a CVE
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(backports-ssl_match_hostname-3.4.0.1)
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* It was updated from RFC2818 to RFC 6125 compliance in order to fix another
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security flaw for python-3.3.3 and python-3.4a5
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(backports-ssl_match_hostname-3.4.0.2)
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.. _RFC2818: http://tools.ietf.org/html/rfc2818.html
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