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SSL_CTX_set_quiet_shutdown, SSL_CTX_get_quiet_shutdown, SSL_set_quiet_shutdown, SSL_get_quiet_shutdownmanipulate shutdown behaviour

#include <openssl/ssl.h>

SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode);

SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx);

SSL_set_quiet_shutdown(SSL *ssl, int mode);

SSL_get_quiet_shutdown(const SSL *ssl);

() sets the “quiet shutdown” flag for ctx to be mode. SSL objects created from ctx inherit the mode valid at the time SSL_new(3) is called. mode may be 0 or 1.

() returns the “quiet shutdown” setting of ctx.

() sets the “quiet shutdown” flag for ssl to be mode. The setting stays valid until ssl is removed with SSL_free(3) or SSL_set_quiet_shutdown() is called again. It is not changed when SSL_clear(3) is called. mode may be 0 or 1.

() returns the “quiet shutdown” setting of ssl.

Normally when a SSL connection is finished, the parties must send out “close notify” alert messages using SSL_shutdown(3) for a clean shutdown.

When setting the “quiet shutdown” flag to 1, SSL_shutdown(3) will set the internal flags to SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN (SSL_shutdown(3) then behaves like SSL_set_shutdown(3) called with SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN). The session is thus considered to be shut down, but no “close notify” alert is sent to the peer. This behaviour violates the TLS standard.

The default is normal shutdown behaviour as described by the TLS standard.

SSL_CTX_get_quiet_shutdown() and SSL_get_quiet_shutdown() return the current setting.

ssl(3), SSL_clear(3), SSL_free(3), SSL_new(3), SSL_set_shutdown(3), SSL_shutdown(3)

These functions first appeared in SSLeay 0.8.1 and have been available since OpenBSD 2.4.

March 30, 2020 OpenBSD-7.3