gnutls_srp_set_server_credentials_function man page on DragonFly
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gnutls_srp_set_server_credentialsgnutls_srp_set_server_credentials_function(3)
NAME
gnutls_srp_set_server_credentials_function - API function
SYNOPSIS
#include <gnutls/gnutls.h>
void gnutls_srp_set_server_credentials_function(gnutls_srp_server_cre‐
dentials_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 *generator,
gnutls_datum_t *prime);
username contains the actual username. The salt , verifier , gen‐
erator and prime must be filled in using the gnutls_malloc(). For con‐
venience 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.
REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org
COPYRIGHT
Copyright © 2001-2014 Free Software Foundation, Inc..
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
http://www.gnutls.org/manual/
gnutls gnutls_srp_set_server_credentials_function(3)
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