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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
gnutls_srp_set_server_credentials_function(3)_server_credentials_function(3)
gnutls_srp_set_server_credentials_function - API function
#include <gnutls/gnutls.h>
void
gnutls_srp_set_server_credentials_function(gnutls_srp_server_credentials_t
cred, gnutls_srp_server_credentials_function * func);
gnutls_srp_server_credentials_t cred
is a gnutls_srp_server_credentials_t type.
gnutls_srp_server_credentials_function * func
is the callback function
This function can be used to set a callback to retrieve the user's
SRP credentials. The callback's function form is:
int (*callback)(gnutls_session_t, const char* username,
gnutls_datum_t *salt, gnutls_datum_t *verifier, gnutls_datum_t
*generator, gnutls_datum_t *prime);
username contains the actual username. The salt , verifier ,
generator and prime must be filled in using the gnutls_malloc(). For
convenience prime and generator may also be one of the static
parameters defined in gnutls.h.
Initially, the data field is NULL in every gnutls_datum_t structure
that the callback has to fill in. When the callback is done GnuTLS
deallocates all of those buffers which are non-NULL, regardless of
the return value.
In order to prevent attackers from guessing valid usernames, if a
user does not exist, g and n values should be filled in using a
random user's parameters. In that case the callback must return the
special value (1). See gnutls_srp_set_server_fake_salt_seed too. If
this is not required for your application, return a negative number
from the callback to abort the handshake.
The callback function will only be called once per handshake. The
callback function should return 0 on success, while -1 indicates an
error.
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org
Copyright © 2001-2017 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.
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
http://www.gnutls.org/manual/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this manual
page, send it to bugs@gnutls.org.. This page was obtained from the
tarball gnutls-3.5.9.tar.xz fetched from
⟨http://www.gnutls.org/download.html⟩ on 2017-07-05. If you discover
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COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
gnutls gnutl3s._5s.r9p_set_server_credentials_function(3)