gnutls_reauth(3) gnutls gnutls_reauth(3)
NAME
gnutls_reauth - API function
SYNOPSIS
#include <gnutls/gnutls.h>
int gnutls_reauth(gnutls_session_t session, unsigned int flags);
ARGUMENTS
gnutls_session_t session
is a gnutls_session_t type.
unsigned int flags
must be zero
DESCRIPTION
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_INTER-
RUPTED, 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 trans-
port 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
gnutls_reauth().
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_RE-
QUEST. 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 gnutls_session_get_flags().
Prior to calling this function in server side, the function gnutls_cer-
tificate_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
function.
RETURNS
GNUTLS_E_SUCCESS on a successful authentication, otherwise a negative
error code.
REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
COPYRIGHT
Copyright © 2001-2023 Free Software Foundation, Inc., and others.
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.
SEE ALSO
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
https://www.gnutls.org/manual/
gnutls 3.8.9 gnutls_reauth(3)
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