dist/wpa/hostapd/eapol_sm.h

   1 /*
   2  * hostapd / IEEE 802.1X-2004 Authenticator - EAPOL state machine
   3  * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #ifndef EAPOL_SM_H
  16 #define EAPOL_SM_H
  17
  18 #include "defs.h"
  19
  20 /* IEEE Std 802.1X-2004, Ch. 8.2 */
  21
  22 typedef enum { ForceUnauthorized = 1, ForceAuthorized = 3, Auto = 2 }
  23         PortTypes;
  24 typedef enum { Unauthorized = 2, Authorized = 1 } PortState;
  25 typedef enum { Both = 0, In = 1 } ControlledDirection;
  26 typedef unsigned int Counter;
  27
  28 struct eap_sm;
  29
  30 struct radius_attr_data {
  31         u8 *data;
  32         size_t len;
  33 };
  34
  35 struct radius_class_data {
  36         struct radius_attr_data *attr;
  37         size_t count;
  38 };
  39
  40
  41 struct eapol_auth_config {
  42         int eap_reauth_period;
  43         int wpa;
  44         int individual_wep_key_len;
  45         int eap_server;
  46         void *ssl_ctx;
  47         void *eap_sim_db_priv;
  48         char *eap_req_id_text; /* a copy of this will be allocated */
  49         size_t eap_req_id_text_len;
  50         u8 *pac_opaque_encr_key;
  51         char *eap_fast_a_id;
  52         int eap_sim_aka_result_ind;
  53         int tnc;
  54
  55         /*
  56          * Pointer to hostapd data. This is a temporary workaround for
  57          * transition phase and will be removed once IEEE 802.1X/EAPOL code is
  58          * separated more cleanly from rest of hostapd.
  59          */
  60         struct hostapd_data *hapd;
  61 };
  62
  63 struct eap_user;
  64
  65 typedef enum {
  66         EAPOL_LOGGER_DEBUG, EAPOL_LOGGER_INFO, EAPOL_LOGGER_WARNING
  67 } eapol_logger_level;
  68
  69 struct eapol_auth_cb {
  70         void (*eapol_send)(void *ctx, void *sta_ctx, u8 type, const u8 *data,
  71                            size_t datalen);
  72         void (*aaa_send)(void *ctx, void *sta_ctx, const u8 *data,
  73                          size_t datalen);
  74         void (*finished)(void *ctx, void *sta_ctx, int success, int preauth);
  75         int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
  76                             int phase2, struct eap_user *user);
  77         int (*sta_entry_alive)(void *ctx, const u8 *addr);
  78         void (*logger)(void *ctx, const u8 *addr, eapol_logger_level level,
  79                        const char *txt);
  80         void (*set_port_authorized)(void *ctx, void *sta_ctx, int authorized);
  81         void (*abort_auth)(void *ctx, void *sta_ctx);
  82         void (*tx_key)(void *ctx, void *sta_ctx);
  83 };
  84
  85 /**
  86  * struct eapol_authenticator - Global EAPOL authenticator data
  87  */
  88 struct eapol_authenticator {
  89         struct eapol_auth_config conf;
  90         struct eapol_auth_cb cb;
  91 };
  92
  93
  94 /**
  95  * struct eapol_state_machine - Per-Supplicant Authenticator state machines
  96  */
  97 struct eapol_state_machine {
  98         /* timers */
  99         int aWhile;
 100         int quietWhile;
 101         int reAuthWhen;
 102
 103         /* global variables */
 104         Boolean authAbort;
 105         Boolean authFail;
 106         PortState authPortStatus;
 107         Boolean authStart;
 108         Boolean authTimeout;
 109         Boolean authSuccess;
 110         Boolean eapolEap;
 111         Boolean initialize;
 112         Boolean keyDone;
 113         Boolean keyRun;
 114         Boolean keyTxEnabled;
 115         PortTypes portControl;
 116         Boolean portValid;
 117         Boolean reAuthenticate;
 118
 119         /* Port Timers state machine */
 120         /* 'Boolean tick' implicitly handled as registered timeout */
 121
 122         /* Authenticator PAE state machine */
 123         enum { AUTH_PAE_INITIALIZE, AUTH_PAE_DISCONNECTED, AUTH_PAE_CONNECTING,
 124                AUTH_PAE_AUTHENTICATING, AUTH_PAE_AUTHENTICATED,
 125                AUTH_PAE_ABORTING, AUTH_PAE_HELD, AUTH_PAE_FORCE_AUTH,
 126                AUTH_PAE_FORCE_UNAUTH, AUTH_PAE_RESTART } auth_pae_state;
 127         /* variables */
 128         Boolean eapolLogoff;
 129         Boolean eapolStart;
 130         PortTypes portMode;
 131         unsigned int reAuthCount;
 132         /* constants */
 133         unsigned int quietPeriod; /* default 60; 0..65535 */
 134 #define AUTH_PAE_DEFAULT_quietPeriod 60
 135         unsigned int reAuthMax; /* default 2 */
 136 #define AUTH_PAE_DEFAULT_reAuthMax 2
 137         /* counters */
 138         Counter authEntersConnecting;
 139         Counter authEapLogoffsWhileConnecting;
 140         Counter authEntersAuthenticating;
 141         Counter authAuthSuccessesWhileAuthenticating;
 142         Counter authAuthTimeoutsWhileAuthenticating;
 143         Counter authAuthFailWhileAuthenticating;
 144         Counter authAuthEapStartsWhileAuthenticating;
 145         Counter authAuthEapLogoffWhileAuthenticating;
 146         Counter authAuthReauthsWhileAuthenticated;
 147         Counter authAuthEapStartsWhileAuthenticated;
 148         Counter authAuthEapLogoffWhileAuthenticated;
 149
 150         /* Backend Authentication state machine */
 151         enum { BE_AUTH_REQUEST, BE_AUTH_RESPONSE, BE_AUTH_SUCCESS,
 152                BE_AUTH_FAIL, BE_AUTH_TIMEOUT, BE_AUTH_IDLE, BE_AUTH_INITIALIZE,
 153                BE_AUTH_IGNORE
 154         } be_auth_state;
 155         /* constants */
 156         unsigned int serverTimeout; /* default 30; 1..X */
 157 #define BE_AUTH_DEFAULT_serverTimeout 30
 158         /* counters */
 159         Counter backendResponses;
 160         Counter backendAccessChallenges;
 161         Counter backendOtherRequestsToSupplicant;
 162         Counter backendAuthSuccesses;
 163         Counter backendAuthFails;
 164
 165         /* Reauthentication Timer state machine */
 166         enum { REAUTH_TIMER_INITIALIZE, REAUTH_TIMER_REAUTHENTICATE
 167         } reauth_timer_state;
 168         /* constants */
 169         unsigned int reAuthPeriod; /* default 3600 s */
 170         Boolean reAuthEnabled;
 171
 172         /* Authenticator Key Transmit state machine */
 173         enum { AUTH_KEY_TX_NO_KEY_TRANSMIT, AUTH_KEY_TX_KEY_TRANSMIT
 174         } auth_key_tx_state;
 175
 176         /* Key Receive state machine */
 177         enum { KEY_RX_NO_KEY_RECEIVE, KEY_RX_KEY_RECEIVE } key_rx_state;
 178         /* variables */
 179         Boolean rxKey;
 180
 181         /* Controlled Directions state machine */
 182         enum { CTRL_DIR_FORCE_BOTH, CTRL_DIR_IN_OR_BOTH } ctrl_dir_state;
 183         /* variables */
 184         ControlledDirection adminControlledDirections;
 185         ControlledDirection operControlledDirections;
 186         Boolean operEdge;
 187
 188         /* Authenticator Statistics Table */
 189         Counter dot1xAuthEapolFramesRx;
 190         Counter dot1xAuthEapolFramesTx;
 191         Counter dot1xAuthEapolStartFramesRx;
 192         Counter dot1xAuthEapolLogoffFramesRx;
 193         Counter dot1xAuthEapolRespIdFramesRx;
 194         Counter dot1xAuthEapolRespFramesRx;
 195         Counter dot1xAuthEapolReqIdFramesTx;
 196         Counter dot1xAuthEapolReqFramesTx;
 197         Counter dot1xAuthInvalidEapolFramesRx;
 198         Counter dot1xAuthEapLengthErrorFramesRx;
 199         Counter dot1xAuthLastEapolFrameVersion;
 200
 201         /* Other variables - not defined in IEEE 802.1X */
 202         u8 addr[ETH_ALEN]; /* Supplicant address */
 203 #define EAPOL_SM_PREAUTH BIT(0)
 204 #define EAPOL_SM_WAIT_START BIT(1)
 205         int flags; /* EAPOL_SM_* */
 206
 207         /* EAPOL/AAA <-> EAP full authenticator interface */
 208         struct eap_eapol_interface *eap_if;
 209
 210         int radius_identifier;
 211         /* TODO: check when the last messages can be released */
 212         struct radius_msg *last_recv_radius;
 213         u8 last_eap_id; /* last used EAP Identifier */
 214         u8 *identity;
 215         size_t identity_len;
 216         u8 eap_type_authsrv; /* EAP type of the last EAP packet from
 217                               * Authentication server */
 218         u8 eap_type_supp; /* EAP type of the last EAP packet from Supplicant */
 219         struct radius_class_data radius_class;
 220
 221         /* Keys for encrypting and signing EAPOL-Key frames */
 222         u8 *eapol_key_sign;
 223         size_t eapol_key_sign_len;
 224         u8 *eapol_key_crypt;
 225         size_t eapol_key_crypt_len;
 226
 227         struct eap_sm *eap;
 228
 229         Boolean initializing; /* in process of initializing state machines */
 230         Boolean changed;
 231
 232         struct eapol_authenticator *eapol;
 233
 234         /* Somewhat nasty pointers to global hostapd and STA data to avoid
 235          * passing these to every function */
 236         struct hostapd_data *hapd;
 237         struct sta_info *sta;
 238 };
 239
 240
 241 struct eapol_authenticator * eapol_auth_init(struct eapol_auth_config *conf,
 242                                              struct eapol_auth_cb *cb);
 243 void eapol_auth_deinit(struct eapol_authenticator *eapol);
 244 struct eapol_state_machine *
 245 eapol_auth_alloc(struct eapol_authenticator *eapol, const u8 *addr,
 246                  int preauth, struct sta_info *sta);
 247 void eapol_auth_free(struct eapol_state_machine *sm);
 248 void eapol_auth_step(struct eapol_state_machine *sm);
 249 void eapol_auth_initialize(struct eapol_state_machine *sm);
 250 void eapol_auth_dump_state(FILE *f, const char *prefix,
 251                            struct eapol_state_machine *sm);
 252 int eapol_auth_eap_pending_cb(struct eapol_state_machine *sm, void *ctx);
 253
 254 #endif /* EAPOL_SM_H */