module.h

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 8a1ca32e86ebfd96b6b3f198530e9241f10a26aa $
 * @file lib/eap_aka_sim/module.h
 * @brief Declarations for the common module functions used by EAP-SIM/AKA submodules
 *
 * @author Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 *
 * @copyright 2016-2019 The FreeRADIUS server project
 * @copyright 2016-2019 Network RADIUS SAS <legal.com>
 */
RCSIDH(lib_eap_aka_sim_module_h, "$Id: 8a1ca32e86ebfd96b6b3f198530e9241f10a26aa $")
 
#include <freeradius-devel/server/cf_util.h>
#include <freeradius-devel/server/virtual_servers.h>
#include <freeradius-devel/eap/types.h>
 
#include <freeradius-devel/tls/openssl_user_macros.h>
#include <openssl/evp.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct {
        virtual_server_t                *virtual_server;                //!< Virtual server.
 
        /** Whether we should include a bid-down prevention attribute by default
         *
         * Only used for EAP-AKA, as a signal that EAP-AKA' was available/enabled
         * on the server, and if the client supports EAP-AKA', it should continue
         * with that EAP-Method instead.
         */
        struct {
                bool                            send_at_bidding_prefer_prime;   //!< Include the AT bidding attribute in
                                                                                ///< challenge requests.
                bool                            send_at_bidding_prefer_prime_is_set;    //!< Whether the user specified
                                                                                        ///< a value.
        } aka;
 
        eap_type_t                      type;
} eap_aka_sim_module_conf_t;
 
/** Structure used to track session state at the module level
 *
 * The process module has a similar structure (eap_aka_sim_module_t) which tracks
 * all of the cryptographic parameters for the session.
 *
 * The structure here stores copies of the cryptographic parameters used for
 * validating incoming packets, and signing outgoing packets, from control attributes
 * provided by the state machine.
 *
 * This separation is to allow the process module to be executed without the
 * submodule, so that the state machine can be tested independently of the
 * encode/decode/crypto code.
 */
typedef struct {
        uint8_t                 id;                     //!< Last ID used, monotonically increments.
 
        uint8_t                 *response_hmac_extra;   //!< Data to concatenate to response packet
                                                        ///< before validating.
        size_t                  response_hmac_extra_len;
 
        unlang_result_t         virtual_server_result;
 
        fr_aka_sim_checkcode_t  *checkcode_state;       //!< Digest of all identity packets we've seen.
        fr_aka_sim_ctx_t        ctx;
} eap_aka_sim_mod_session_t;
 
unlang_action_t         eap_aka_sim_process(unlang_result_t *p_result, module_ctx_t const *mctx, request_t *request);
 
#ifdef __cplusplus
}
#endif