gnutls_reauth(3) — Linux manual page


gnutls_reauth(3)                 gnutls                 gnutls_reauth(3)

NAME         top

       gnutls_reauth - API function

SYNOPSIS         top

       #include <gnutls/gnutls.h>

       int gnutls_reauth(gnutls_session_t session, unsigned int flags);

ARGUMENTS         top

       gnutls_session_t session
                   is a gnutls_session_t type.

       unsigned int flags
                   must be zero

DESCRIPTION         top

       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_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 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_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 gnutls_session_get_flags().

       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

       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         top

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

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       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         top

       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

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at
       ⟨⟩.  If you have a bug report for this
       manual page, send it to  This page was obtained
       from the tarball gnutls-3.8.2.tar.xz fetched from
       ⟨⟩ on 2023-12-22.  If you
       discover any rendering problems in this HTML version of the page,
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gnutls                            3.8.2                 gnutls_reauth(3)