79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
|
/* Osmocom Authentication Protocol API */
|
||
|
|
||
|
/* (C) 2015 by Sysmocom s.f.m.c. GmbH
|
||
|
* All Rights Reserved
|
||
|
*
|
||
|
* Author: Neels Hofmeyr
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or modify
|
||
|
* it under the terms of the GNU Affero General Public License as published by
|
||
|
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU Affero General Public License
|
||
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#pragma once
|
||
|
|
||
|
#include <stdint.h>
|
||
|
|
||
|
struct msgb;
|
||
|
struct oap_message;
|
||
|
|
||
|
/* This is the config part for vty. It is essentially copied in oap_state,
|
||
|
* where values are copied over once the config is considered valid. */
|
||
|
struct oap_config {
|
||
|
uint16_t client_id;
|
||
|
int secret_k_present;
|
||
|
uint8_t secret_k[16];
|
||
|
int secret_opc_present;
|
||
|
uint8_t secret_opc[16];
|
||
|
};
|
||
|
|
||
|
/* The runtime state of the OAP client. client_id and the secrets are in fact
|
||
|
* duplicated from oap_config, so that a separate validation of the config data
|
||
|
* is possible, and so that only a struct oap_state* is passed around. */
|
||
|
struct oap_state {
|
||
|
enum {
|
||
|
OAP_UNINITIALIZED = 0, /* just allocated. */
|
||
|
OAP_DISABLED, /* disabled by config. */
|
||
|
OAP_INITIALIZED, /* enabled, config is valid. */
|
||
|
OAP_REQUESTED_CHALLENGE,
|
||
|
OAP_SENT_CHALLENGE_RESULT,
|
||
|
OAP_REGISTERED
|
||
|
} state;
|
||
|
uint16_t client_id;
|
||
|
uint8_t secret_k[16];
|
||
|
uint8_t secret_opc[16];
|
||
|
int registration_failures;
|
||
|
};
|
||
|
|
||
|
/* From config, initialize state. Return 0 on success. */
|
||
|
int oap_init(struct oap_config *config, struct oap_state *state);
|
||
|
|
||
|
/* Construct an OAP registration message and return in *msg_tx. Use
|
||
|
* state->client_id and update state->state.
|
||
|
* Return 0 on success, or a negative value on error.
|
||
|
* If an error is returned, *msg_tx is guaranteed to be NULL. */
|
||
|
int oap_register(struct oap_state *state, struct msgb **msg_tx);
|
||
|
|
||
|
/* Decode and act on a received OAP message msg_rx. Update state->state. If a
|
||
|
* non-NULL pointer is returned in *msg_tx, that msgb should be sent to the OAP
|
||
|
* server (and freed) by the caller. The received msg_rx is not freed.
|
||
|
* Return 0 on success, or a negative value on error.
|
||
|
* If an error is returned, *msg_tx is guaranteed to be NULL. */
|
||
|
int oap_handle(struct oap_state *state, const struct msgb *msg_rx, struct msgb **msg_tx);
|
||
|
|
||
|
/* Allocate a msgb and in it, return the encoded oap_msg. Return NULL on
|
||
|
* error. (Like oap_encode(), but also allocates a msgb.)
|
||
|
* About the name: the idea is do_something(oap_encoded(my_struct)) */
|
||
|
struct msgb *oap_encoded(const struct oap_message *oap_msg);
|
||
|
|