gnutls_reauth(3)                     gnutls                     gnutls_reauth(3)

       gnutls_reauth - API function

       #include <gnutls/gnutls.h>

       int gnutls_reauth(gnutls_session_t session, unsigned int flags);

       gnutls_session_t session
                   is a gnutls_session_t type.

       unsigned int flags
                   must be zero

       This function performs the post-handshake authentication for TLS 1.3. The
       post-handshake authentication is initiated by the server by calling this
       function. Clients respond when GNUTLS_E_REAUTH_REQUEST has been seen
       while receiving data.

       The non-fatal errors expected by this function are: GNUTLS_E_INTERRUPTED,
       GNUTLS_E_AGAIN, as well as GNUTLS_E_GOT_APPLICATION_DATA when called on
       server side.

       The former two interrupt the authentication procedure due to the
       transport layer being interrupted, and the latter because there were
       pending data prior to peer initiating the re-authentication. The server
       should read/process that data as unauthenticated and retry calling

       When this function is called under TLS1.2 or earlier or the peer didn't
       advertise post-handshake auth, it always fails with
       GNUTLS_E_INVALID_REQUEST. The verification of the received peers
       certificate is delegated to the session or credentials verification
       callbacks. A server can check whether post handshake authentication is
       supported by the client by checking the session flags with

       Prior to calling this function in server side, the function
       gnutls_certificate_server_set_request() must be called setting
       expectations for the received certificate (request or require). If none
       are set this function will return with GNUTLS_E_INVALID_REQUEST.

       Note that post handshake authentication is available irrespective of the
       initial negotiation type (PSK or certificate). In all cases however,
       certificate credentials must be set to the session prior to calling this

       GNUTLS_E_SUCCESS on a successful authentication, otherwise a negative
       error code.

       Report bugs to <>.
       Home page:

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       Copying and distribution of this file, with or without modification, are
       permitted in any medium without royalty provided the copyright notice and
       this notice are preserved.

       The full documentation for gnutls is maintained as a Texinfo manual.  If
       the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

gnutls                               3.6.13                     gnutls_reauth(3)