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/* HTTP authentication routines Copyright © 1999-2007, Joe Orton joe@manyfish.co.uk

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details.

You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA


ifndef NE_AUTH_H

define NE_AUTH_H

include “ne_session.h” / for ne_session /


/ Size of username/password buffers passed to ne_auth_creds * callback. /

define NE_ABUFSIZ (256)

/ The callback used to request the username and password in the given * realm. The username and password must be copied into the buffers * which are both of size NE_ABUFSIZ. The ‘attempt’ parameter is zero * on the first call to the callback, and increases by one each time * an attempt to authenticate fails. * * The callback must return zero to indicate that authentication * should be attempted with the username/password, or non-zero to * cancel the request. (if non-zero, username and password are * ignored.) * * IMPORTANT NOTE: The callback will be invoked repeatedly until * either it returns non-zero, or authentication is successful. * * Hint: if you just wish to attempt authentication just once (even if * the user gets the username/password wrong), have the callback * function use ‘attempt’ value as the function return value. / typedef int (ne_auth_creds)(void userdata, const char realm, int attempt, char username, char *password);

/ Set callbacks to provide credentials for server and proxy * authentication, using the default set of authentication protocols. * userdata is passed as the first argument to the callback. / void ne_set_server_auth(ne_session sess, ne_auth_creds creds, void userdata); void ne_set_proxy_auth(ne_session sess, ne_auth_creds creds, void userdata);

/ As an alternative to using ne_set_server_auth and * ne_set_proxy_auth, the following interfaces may be used; these * allow control over which authentication protocol is used. /

/ NE_AUTH_BASIC: Basic authentication transmits the username and * password unprotected over the channel; this allows a passive attack * to steal the credentials if using an unsecured channel * (i.e. non-SSL). /

define NE_AUTH_BASIC (0x0001)

/ NE_AUTH_DIGEST: Digest authentication uses a hash of the username, * password, and certain aspects of the request, so prevents passive * attackers from obtaining the credentials; active attackers can * still modify most of the request/response if using an unsecured * channel. /

define NE_AUTH_DIGEST (0x0002)

/ NE_AUTH_NEGOTIATE: Negotiate uses GSSAPI/SSPI to authenticate the * user; an active attacker can modify any of the request/response at * will, so this must not be used over an unsecured channel. /

define NE_AUTH_NEGOTIATE (0x0004)

/ The default set of supported protocols, as deemed appropriate for * the given session scheme. /

define NE_AUTH_DEFAULT (0x1000)

/ All protocols supported by the library. /

define NE_AUTH_ALL (0x2000)

/ Add a callback to provide credentials for server and proxy * authentication using a particular auth protocol or set of * protocols. The protocol is supplied as a bitmask of NE_AUTH_ * values. For NE_AUTH_NEGOTIATE, the creds and userdata arguments * are ignored and may be NULL. * * These functions may be called multiple times per session to * register callbacks for different protocols. If the server presents * more than one protocol in an auth challenge, the following * algorithm will be used to determine which callback is used: * * - iterate over the registered callbacks in the order registered * - for each each callback, iterate over the known set of protocols * in order of algorithm strength (strongest first). * - if the protocol mask for that callback matches the protocol, * attempt authentication using this protocol. * * Therefore, if multiple calls to ne_add_server_auth or * ne_add_proxy_auth are used for a given session, the caller must * ensure that the order in which those calls are made reflects the * precedence of protocols to be used. / void ne_add_server_auth(ne_session sess, unsigned protocol, ne_auth_creds creds, void userdata); void ne_add_proxy_auth(ne_session sess, unsigned protocol, ne_auth_creds creds, void *userdata);

/ Clear any cached authentication credentials for the given * session. / void ne_forget_auth(ne_session *sess);


endif / NE_AUTH_H /