gnutls_srp_set_server_credentials_function man page on aLinux
[printable version]
gnutls_srp_set_server_credentialsgnutls_srp_set_server_credentials_function(3)
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_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 (*call‐
back)(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>.
COPYRIGHT
Copyright © 2004 Free Software Foundation.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
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 gnutls_srp_set_server_credentials_function(3)
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