NAME
gnutls_srp_set_server_credentials_function - Used to set a callback to
retrieve the user’s SRP credentials
SYNOPSIS
#include <gnutls/gnutls.h>
void
gnutls_srp_set_server_credentials_function(gnutls_srp_server_credentials_t
cred, gnutls_srp_server_credentials_function * func);
ARGUMENTS
gnutls_srp_server_credentials_t cred
is a gnutls_srp_server_credentials_t structure.
gnutls_srp_server_credentials_function * func
is the callback function
DESCRIPTION
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* g, gnutls_datum_t* n);
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
extra.h.
In case the callback returned a negative number then gnutls will assume
that the username does not exist.
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).
The callback function will only be called once per handshake. The
callback function should return 0 on success, while -1 indicates an
error.
REPORTING BUGS
Report bugs to <bug-gnutls@gnu.org>. GnuTLS home page:
http://www.gnu.org/software/gnutls/ General help using GNU software:
http://www.gnu.org/gethelp/
COPYRIGHT
Copyright © 2008 Free Software Foundation.
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 info and gnutls programs are properly installed at your site,
the command
info gnutls
should give you access to the complete manual.
gnutls gnutls8srp_set_server_credentials_function(3)