contrib/hostapd/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         u8 *eap_fast_a_id;
  52         size_t eap_fast_a_id_len;
  53         char *eap_fast_a_id_info;
  54         int eap_fast_prov;
  55         int pac_key_lifetime;
  56         int pac_key_refresh_time;
  57         int eap_sim_aka_result_ind;
  58         int tnc;
  59         struct wps_context *wps;
  60
  61         /*
  62          * Pointer to hostapd data. This is a temporary workaround for
  63          * transition phase and will be removed once IEEE 802.1X/EAPOL code is
  64          * separated more cleanly from rest of hostapd.
  65          */
  66         struct hostapd_data *hapd;
  67 };
  68
  69 struct eap_user;
  70
  71 typedef enum {
  72         EAPOL_LOGGER_DEBUG, EAPOL_LOGGER_INFO, EAPOL_LOGGER_WARNING
  73 } eapol_logger_level;
  74
  75 struct eapol_auth_cb {
  76         void (*eapol_send)(void *ctx, void *sta_ctx, u8 type, const u8 *data,
  77                            size_t datalen);
  78         void (*aaa_send)(void *ctx, void *sta_ctx, const u8 *data,
  79                          size_t datalen);
  80         void (*finished)(void *ctx, void *sta_ctx, int success, int preauth);
  81         int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
  82                             int phase2, struct eap_user *user);
  83         int (*sta_entry_alive)(void *ctx, const u8 *addr);
  84         void (*logger)(void *ctx, const u8 *addr, eapol_logger_level level,
  85                        const char *txt);
  86         void (*set_port_authorized)(void *ctx, void *sta_ctx, int authorized);
  87         void (*abort_auth)(void *ctx, void *sta_ctx);
  88         void (*tx_key)(void *ctx, void *sta_ctx);
  89 };
  90
  91 /**
  92  * struct eapol_authenticator - Global EAPOL authenticator data
  93  */
  94 struct eapol_authenticator {
  95         struct eapol_auth_config conf;
  96         struct eapol_auth_cb cb;
  97 };
  98
  99
 100 /**
 101  * struct eapol_state_machine - Per-Supplicant Authenticator state machines
 102  */
 103 struct eapol_state_machine {
 104         /* timers */
 105         int aWhile;
 106         int quietWhile;
 107         int reAuthWhen;
 108
 109         /* global variables */
 110         Boolean authAbort;
 111         Boolean authFail;
 112         PortState authPortStatus;
 113         Boolean authStart;
 114         Boolean authTimeout;
 115         Boolean authSuccess;
 116         Boolean eapolEap;
 117         Boolean initialize;
 118         Boolean keyDone;
 119         Boolean keyRun;
 120         Boolean keyTxEnabled;
 121         PortTypes portControl;
 122         Boolean portValid;
 123         Boolean reAuthenticate;
 124
 125         /* Port Timers state machine */
 126         /* 'Boolean tick' implicitly handled as registered timeout */
 127
 128         /* Authenticator PAE state machine */
 129         enum { AUTH_PAE_INITIALIZE, AUTH_PAE_DISCONNECTED, AUTH_PAE_CONNECTING,
 130                AUTH_PAE_AUTHENTICATING, AUTH_PAE_AUTHENTICATED,
 131                AUTH_PAE_ABORTING, AUTH_PAE_HELD, AUTH_PAE_FORCE_AUTH,
 132                AUTH_PAE_FORCE_UNAUTH, AUTH_PAE_RESTART } auth_pae_state;
 133         /* variables */
 134         Boolean eapolLogoff;
 135         Boolean eapolStart;
 136         PortTypes portMode;
 137         unsigned int reAuthCount;
 138         /* constants */
 139         unsigned int quietPeriod; /* default 60; 0..65535 */
 140 #define AUTH_PAE_DEFAULT_quietPeriod 60
 141         unsigned int reAuthMax; /* default 2 */
 142 #define AUTH_PAE_DEFAULT_reAuthMax 2
 143         /* counters */
 144         Counter authEntersConnecting;
 145         Counter authEapLogoffsWhileConnecting;
 146         Counter authEntersAuthenticating;
 147         Counter authAuthSuccessesWhileAuthenticating;
 148         Counter authAuthTimeoutsWhileAuthenticating;
 149         Counter authAuthFailWhileAuthenticating;
 150         Counter authAuthEapStartsWhileAuthenticating;
 151         Counter authAuthEapLogoffWhileAuthenticating;
 152         Counter authAuthReauthsWhileAuthenticated;
 153         Counter authAuthEapStartsWhileAuthenticated;
 154         Counter authAuthEapLogoffWhileAuthenticated;
 155
 156         /* Backend Authentication state machine */
 157         enum { BE_AUTH_REQUEST, BE_AUTH_RESPONSE, BE_AUTH_SUCCESS,
 158                BE_AUTH_FAIL, BE_AUTH_TIMEOUT, BE_AUTH_IDLE, BE_AUTH_INITIALIZE,
 159                BE_AUTH_IGNORE
 160         } be_auth_state;
 161         /* constants */
 162         unsigned int serverTimeout; /* default 30; 1..X */
 163 #define BE_AUTH_DEFAULT_serverTimeout 30
 164         /* counters */
 165         Counter backendResponses;
 166         Counter backendAccessChallenges;
 167         Counter backendOtherRequestsToSupplicant;
 168         Counter backendAuthSuccesses;
 169         Counter backendAuthFails;
 170
 171         /* Reauthentication Timer state machine */
 172         enum { REAUTH_TIMER_INITIALIZE, REAUTH_TIMER_REAUTHENTICATE
 173         } reauth_timer_state;
 174         /* constants */
 175         unsigned int reAuthPeriod; /* default 3600 s */
 176         Boolean reAuthEnabled;
 177
 178         /* Authenticator Key Transmit state machine */
 179         enum { AUTH_KEY_TX_NO_KEY_TRANSMIT, AUTH_KEY_TX_KEY_TRANSMIT
 180         } auth_key_tx_state;
 181
 182         /* Key Receive state machine */
 183         enum { KEY_RX_NO_KEY_RECEIVE, KEY_RX_KEY_RECEIVE } key_rx_state;
 184         /* variables */
 185         Boolean rxKey;
 186
 187         /* Controlled Directions state machine */
 188         enum { CTRL_DIR_FORCE_BOTH, CTRL_DIR_IN_OR_BOTH } ctrl_dir_state;
 189         /* variables */
 190         ControlledDirection adminControlledDirections;
 191         ControlledDirection operControlledDirections;
 192         Boolean operEdge;
 193
 194         /* Authenticator Statistics Table */
 195         Counter dot1xAuthEapolFramesRx;
 196         Counter dot1xAuthEapolFramesTx;
 197         Counter dot1xAuthEapolStartFramesRx;
 198         Counter dot1xAuthEapolLogoffFramesRx;
 199         Counter dot1xAuthEapolRespIdFramesRx;
 200         Counter dot1xAuthEapolRespFramesRx;
 201         Counter dot1xAuthEapolReqIdFramesTx;
 202         Counter dot1xAuthEapolReqFramesTx;
 203         Counter dot1xAuthInvalidEapolFramesRx;
 204         Counter dot1xAuthEapLengthErrorFramesRx;
 205         Counter dot1xAuthLastEapolFrameVersion;
 206
 207         /* Other variables - not defined in IEEE 802.1X */
 208         u8 addr[ETH_ALEN]; /* Supplicant address */
 209 #define EAPOL_SM_PREAUTH BIT(0)
 210 #define EAPOL_SM_WAIT_START BIT(1)
 211         int flags; /* EAPOL_SM_* */
 212
 213         /* EAPOL/AAA <-> EAP full authenticator interface */
 214         struct eap_eapol_interface *eap_if;
 215
 216         int radius_identifier;
 217         /* TODO: check when the last messages can be released */
 218         struct radius_msg *last_recv_radius;
 219         u8 last_eap_id; /* last used EAP Identifier */
 220         u8 *identity;
 221         size_t identity_len;
 222         u8 eap_type_authsrv; /* EAP type of the last EAP packet from
 223                               * Authentication server */
 224         u8 eap_type_supp; /* EAP type of the last EAP packet from Supplicant */
 225         struct radius_class_data radius_class;
 226
 227         /* Keys for encrypting and signing EAPOL-Key frames */
 228         u8 *eapol_key_sign;
 229         size_t eapol_key_sign_len;
 230         u8 *eapol_key_crypt;
 231         size_t eapol_key_crypt_len;
 232
 233         struct eap_sm *eap;
 234
 235         Boolean initializing; /* in process of initializing state machines */
 236         Boolean changed;
 237
 238         struct eapol_authenticator *eapol;
 239
 240         /* Somewhat nasty pointers to global hostapd and STA data to avoid
 241          * passing these to every function */
 242         struct hostapd_data *hapd;
 243         struct sta_info *sta;
 244 };
 245
 246
 247 struct eapol_authenticator * eapol_auth_init(struct eapol_auth_config *conf,
 248                                              struct eapol_auth_cb *cb);
 249 void eapol_auth_deinit(struct eapol_authenticator *eapol);
 250 struct eapol_state_machine *
 251 eapol_auth_alloc(struct eapol_authenticator *eapol, const u8 *addr,
 252                  int preauth, struct sta_info *sta);
 253 void eapol_auth_free(struct eapol_state_machine *sm);
 254 void eapol_auth_step(struct eapol_state_machine *sm);
 255 void eapol_auth_initialize(struct eapol_state_machine *sm);
 256 void eapol_auth_dump_state(FILE *f, const char *prefix,
 257                            struct eapol_state_machine *sm);
 258 int eapol_auth_eap_pending_cb(struct eapol_state_machine *sm, void *ctx);
 259
 260 #endif /* EAPOL_SM_H */