ssl: add SSLContext#min_version= and #max_version= #142
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SSL_CTX_{get,set,clear}_options() are made separate functions and they
now treat flags as unsigned long. Fix possible RangeError on platforms
with sizeof(long)==4.
Reorder, expand ossl_ssl_def_const() macro so RDoc can parse and render better, and add new flags that are in recent versions of OpenSSL.
OpenSSL 1.1.0 replaced SSLv23_method() with TLS_method(). SSLv23_method which still exists in 1.1.0, as a macro around TLS_method, will eventually be removed. Use the new name if possible.
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Add methods that set the minimum and maximum supported protocol versions
for the SSL context. If the OpenSSL library supports, use
SSL_CTX_set_{min,max}_proto_version() that do the exact thing.
Otherwise, simulate by combining SSL_OP_NO_{SSL,TLS}v* flags.
The new methods are meant to replace the deprecated #ssl_version= that
cannot support multiple protocol versions.
SSLContext::DEFAULT_PARAMS is also updated to use the new
SSLContext#min_version=.
Reimplement SSLContext#ssl_version= as a wrapper around
SSLContext#min_version= and #max_version=.
SSLContext#ssl_version= used to call SSL_CTX_set_ssl_version() which
replaces the SSL method used for the connections created from the SSL
context. This is mainly used for forcing a specific SSL/TLS protocol
version.
As of OpenSSL 1.1.0, however, use of the version-specific SSL methods
such as TLSv1_method() is deprecated. Follow the current recommendation
-- to use the generic SSL method always and to control the supported
version range by SSL_CTX_set_{min,max}_proto_version(). Actually, we
have already started doing a similar thing when the extension is
compiled with OpenSSL 1.1.0.
OpenSSL::SSL::SSLContext::METHODS, which contained the possible names of
SSL methods, is not useful anymore. It is now deprecate_constant-ed.
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This was referenced Apr 21, 2018
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Add methods that set the minimum and maximum supported protocol
versions for the SSL context. If the OpenSSL library supports, use
SSL_CTX_set_{min,max}proto_version() that do the exact thing.
Otherwise, simulate by combining SSL_OP_NO{SSL,TLS}v* flags.
The new methods are meant to replace the deprecated
SSLContext#ssl_version= that cannot support multiple protocol versions.
SSLContext::DEFAULT_PARAMS is also updated to use the new
SSLContext#min_version=.