Returns the security level for the context.
See also OpenSSL::SSL::SSLContext#security_level=.
Sets the security level for the context. OpenSSL limits parameters according to the level. The “parameters” include: ciphersuites, curves, key sizes, certificate signature algorithms, protocol version and so on. For example, level 1 rejects parameters offering below 80 bits of security, such as ciphersuites using MD5 for the MAC or RSA keys shorter than 1024 bits.
Note that attempts to set such parameters with insufficient security are also blocked. You need to lower the level first.
This feature is not supported in OpenSSL < 1.1.0, and setting the level to other than 0 will raise NotImplementedError. Level 0 means everything is permitted, the same behavior as previous versions of OpenSSL.
See the manpage of SSL_CTX_set_security_level(3) for details.
Closes the stream for writing. The behavior of this method depends on the version of OpenSSL and the TLS protocol in use.
Sends a ‘close_notify’ alert to the peer.
Does not wait for the peer’s ‘close_notify’ alert in response.
In TLS 1.2 and earlier:
On receipt of a ‘close_notify’ alert, responds with a ‘close_notify’ alert of its own and close down the connection immediately, discarding any pending writes.
Therefore, on TLS 1.2, this method will cause the connection to be completely shut down. On TLS 1.3, the connection will remain open for reading only.