1 /* 2 * hostapd / EAP Authenticator state machine internal structures (RFC 4137) 3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef EAP_I_H 10 #define EAP_I_H 11 12 #include "wpabuf.h" 13 #include "eap_server/eap.h" 14 #include "eap_common/eap_common.h" 15 16 /* RFC 4137 - EAP Standalone Authenticator */ 17 18 /** 19 * struct eap_method - EAP method interface 20 * This structure defines the EAP method interface. Each method will need to 21 * register its own EAP type, EAP name, and set of function pointers for method 22 * specific operations. This interface is based on section 5.4 of RFC 4137. 23 */ 24 struct eap_method { 25 int vendor; 26 EapType method; 27 const char *name; 28 29 void * (*init)(struct eap_sm *sm); 30 void * (*initPickUp)(struct eap_sm *sm); 31 void (*reset)(struct eap_sm *sm, void *priv); 32 33 struct wpabuf * (*buildReq)(struct eap_sm *sm, void *priv, u8 id); 34 int (*getTimeout)(struct eap_sm *sm, void *priv); 35 Boolean (*check)(struct eap_sm *sm, void *priv, 36 struct wpabuf *respData); 37 void (*process)(struct eap_sm *sm, void *priv, 38 struct wpabuf *respData); 39 Boolean (*isDone)(struct eap_sm *sm, void *priv); 40 u8 * (*getKey)(struct eap_sm *sm, void *priv, size_t *len); 41 /* isSuccess is not specified in draft-ietf-eap-statemachine-05.txt, 42 * but it is useful in implementing Policy.getDecision() */ 43 Boolean (*isSuccess)(struct eap_sm *sm, void *priv); 44 45 /** 46 * free - Free EAP method data 47 * @method: Pointer to the method data registered with 48 * eap_server_method_register(). 49 * 50 * This function will be called when the EAP method is being 51 * unregistered. If the EAP method allocated resources during 52 * registration (e.g., allocated struct eap_method), they should be 53 * freed in this function. No other method functions will be called 54 * after this call. If this function is not defined (i.e., function 55 * pointer is %NULL), a default handler is used to release the method 56 * data with free(method). This is suitable for most cases. 57 */ 58 void (*free)(struct eap_method *method); 59 60 #define EAP_SERVER_METHOD_INTERFACE_VERSION 1 61 /** 62 * version - Version of the EAP server method interface 63 * 64 * The EAP server method implementation should set this variable to 65 * EAP_SERVER_METHOD_INTERFACE_VERSION. This is used to verify that the 66 * EAP method is using supported API version when using dynamically 67 * loadable EAP methods. 68 */ 69 int version; 70 71 /** 72 * next - Pointer to the next EAP method 73 * 74 * This variable is used internally in the EAP method registration code 75 * to create a linked list of registered EAP methods. 76 */ 77 struct eap_method *next; 78 79 /** 80 * get_emsk - Get EAP method specific keying extended material (EMSK) 81 * @sm: Pointer to EAP state machine allocated with eap_sm_init() 82 * @priv: Pointer to private EAP method data from eap_method::init() 83 * @len: Pointer to a variable to store EMSK length 84 * Returns: EMSK or %NULL if not available 85 * 86 * This function can be used to get the extended keying material from 87 * the EAP method. The key may already be stored in the method-specific 88 * private data or this function may derive the key. 89 */ 90 u8 * (*get_emsk)(struct eap_sm *sm, void *priv, size_t *len); 91 }; 92 93 /** 94 * struct eap_sm - EAP server state machine data 95 */ 96 struct eap_sm { 97 enum { 98 EAP_DISABLED, EAP_INITIALIZE, EAP_IDLE, EAP_RECEIVED, 99 EAP_INTEGRITY_CHECK, EAP_METHOD_RESPONSE, EAP_METHOD_REQUEST, 100 EAP_PROPOSE_METHOD, EAP_SELECT_ACTION, EAP_SEND_REQUEST, 101 EAP_DISCARD, EAP_NAK, EAP_RETRANSMIT, EAP_SUCCESS, EAP_FAILURE, 102 EAP_TIMEOUT_FAILURE, EAP_PICK_UP_METHOD, 103 EAP_INITIALIZE_PASSTHROUGH, EAP_IDLE2, EAP_RETRANSMIT2, 104 EAP_RECEIVED2, EAP_DISCARD2, EAP_SEND_REQUEST2, 105 EAP_AAA_REQUEST, EAP_AAA_RESPONSE, EAP_AAA_IDLE, 106 EAP_TIMEOUT_FAILURE2, EAP_FAILURE2, EAP_SUCCESS2 107 } EAP_state; 108 109 /* Constants */ 110 int MaxRetrans; 111 112 struct eap_eapol_interface eap_if; 113 114 /* Full authenticator state machine local variables */ 115 116 /* Long-term (maintained between packets) */ 117 EapType currentMethod; 118 int currentId; 119 enum { 120 METHOD_PROPOSED, METHOD_CONTINUE, METHOD_END 121 } methodState; 122 int retransCount; 123 struct wpabuf *lastReqData; 124 int methodTimeout; 125 126 /* Short-term (not maintained between packets) */ 127 Boolean rxResp; 128 int respId; 129 EapType respMethod; 130 int respVendor; 131 u32 respVendorMethod; 132 Boolean ignore; 133 enum { 134 DECISION_SUCCESS, DECISION_FAILURE, DECISION_CONTINUE, 135 DECISION_PASSTHROUGH 136 } decision; 137 138 /* Miscellaneous variables */ 139 const struct eap_method *m; /* selected EAP method */ 140 /* not defined in RFC 4137 */ 141 Boolean changed; 142 void *eapol_ctx, *msg_ctx; 143 struct eapol_callbacks *eapol_cb; 144 void *eap_method_priv; 145 u8 *identity; 146 size_t identity_len; 147 /* Whether Phase 2 method should validate identity match */ 148 int require_identity_match; 149 int lastId; /* Identifier used in the last EAP-Packet */ 150 struct eap_user *user; 151 int user_eap_method_index; 152 int init_phase2; 153 void *ssl_ctx; 154 struct eap_sim_db_data *eap_sim_db_priv; 155 Boolean backend_auth; 156 Boolean update_user; 157 int eap_server; 158 159 int num_rounds; 160 enum { 161 METHOD_PENDING_NONE, METHOD_PENDING_WAIT, METHOD_PENDING_CONT 162 } method_pending; 163 164 u8 *auth_challenge; 165 u8 *peer_challenge; 166 167 u8 *pac_opaque_encr_key; 168 u8 *eap_fast_a_id; 169 size_t eap_fast_a_id_len; 170 char *eap_fast_a_id_info; 171 enum { 172 NO_PROV, ANON_PROV, AUTH_PROV, BOTH_PROV 173 } eap_fast_prov; 174 int pac_key_lifetime; 175 int pac_key_refresh_time; 176 int eap_sim_aka_result_ind; 177 int tnc; 178 u16 pwd_group; 179 struct wps_context *wps; 180 struct wpabuf *assoc_wps_ie; 181 struct wpabuf *assoc_p2p_ie; 182 183 Boolean start_reauth; 184 185 u8 peer_addr[ETH_ALEN]; 186 187 /* Fragmentation size for EAP method init() handler */ 188 int fragment_size; 189 190 int pbc_in_m1; 191 192 const u8 *server_id; 193 size_t server_id_len; 194 }; 195 196 int eap_user_get(struct eap_sm *sm, const u8 *identity, size_t identity_len, 197 int phase2); 198 void eap_sm_process_nak(struct eap_sm *sm, const u8 *nak_list, size_t len); 199 200 #endif /* EAP_I_H */ 201