/*
* EAP peer state machines internal structures (RFC 4137)
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#ifndef EAP_I_H
#define EAP_I_H
#include "eap.h"
/* RFC 4137 - EAP Peer state machine */
typedef enum {
DECISION_FAIL, DECISION_COND_SUCC, DECISION_UNCOND_SUCC
} EapDecision;
typedef enum {
METHOD_NONE, METHOD_INIT, METHOD_CONT, METHOD_MAY_CONT, METHOD_DONE
} EapMethodState;
/**
* struct eap_method_ret - EAP return values from struct eap_method::process()
*
* These structure contains OUT variables for the interface between peer state
* machine and methods (RFC 4137, Sect. 4.2). eapRespData will be returned as
* the return value of struct eap_method::process() so it is not included in
* this structure.
*/
struct eap_method_ret {
/**
* ignore - Whether method decided to drop the current packed (OUT)
*/
Boolean ignore;
/**
* methodState - Method-specific state (IN/OUT)
*/
EapMethodState methodState;
/**
* decision - Authentication decision (OUT)
*/
EapDecision decision;
/**
* allowNotifications - Whether method allows notifications (OUT)
*/
Boolean allowNotifications;
};
/**
* struct eap_method - EAP method interface
* This structure defines the EAP method interface. Each method will need to
* register its own EAP type, EAP name, and set of function pointers for method
* specific operations. This interface is based on section 4.4 of RFC 4137.
*/
struct eap_method {
/**
* vendor - EAP Vendor-ID (EAP_VENDOR_*) (0 = IETF)
*/
int vendor;
/**
* method - EAP type number (EAP_TYPE_*)
*/
EapType method;
/**
* name - Name of the method (e.g., "TLS")
*/
const char *name;
/**
* init - Initialize an EAP method
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* Returns: Pointer to allocated private data, or %NULL on failure
*
* This function is used to initialize the EAP method explicitly
* instead of using METHOD_INIT state as specific in RFC 4137. The
* method is expected to initialize it method-specific state and return
* a pointer that will be used as the priv argument to other calls.
*/
void * (*init)(struct eap_sm *sm);
/**
* deinit - Deinitialize an EAP method
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
*
* Deinitialize the EAP method and free any allocated private data.
*/
void (*deinit)(struct eap_sm *sm, void *priv);
/**
* process - Process an EAP request
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* @ret: Return values from EAP request validation and processing
* @reqData: EAP request to be processed (eapReqData)
* @reqDataLen: Length of the EAP request
* @respDataLen: Length of the returned EAP response
* Returns: Pointer to allocated EAP response packet (eapRespData)
*
* This function is a combination of m.check(), m.process(), and
* m.buildResp() procedures defined in section 4.4 of RFC 4137 In other
* words, this function validates the incoming request, processes it,
* and build a response packet. m.check() and m.process() return values
* are returned through struct eap_method_ret *ret variable. Caller is
* responsible for freeing the returned EAP response packet.
*/
u8 * (*process)(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen);
/**
* isKeyAvailable - Find out whether EAP method has keying material
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* Returns: %TRUE if key material (eapKeyData) is available
*/
Boolean (*isKeyAvailable)(struct eap_sm *sm, void *priv);
/**
* getKey - Get EAP method specific keying material (eapKeyData)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* @len: Pointer to variable to store key length (eapKeyDataLen)
* Returns: Keying material (eapKeyData) or %NULL if not available
*
* This function can be used to get the keying material from the EAP
* method. The key may already be stored in the method-specific private
* data or this function may derive the key.
*/
u8 * (*getKey)(struct eap_sm *sm, void *priv, size_t *len);
/**
* get_status - Get EAP method status
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* @buf: Buffer for status information
* @buflen: Maximum buffer length
* @verbose: Whether to include verbose status information
* Returns: Number of bytes written to buf
*
* Query EAP method for status information. This function fills in a
* text area with current status information from the EAP method. If
* the buffer (buf) is not large enough, status information will be
* truncated to fit the buffer.
*/
int (*get_status)(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose);
/**
* has_reauth_data - Whether method is ready for fast reauthentication
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* Returns: %TRUE or %FALSE based on whether fast reauthentication is
* possible
*
* This function is an optional handler that only EAP methods
* supporting fast re-authentication need to implement.
*/
Boolean (*has_reauth_data)(struct eap_sm *sm, void *priv);
/**
* deinit_for_reauth - Release data that is not needed for fast re-auth
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
*
* This function is an optional handler that only EAP methods
* supporting fast re-authentication need to implement. This is called
* when authentication has been completed and EAP state machine is
* requesting that enough state information is maintained for fast
* re-authentication
*/
void (*deinit_for_reauth)(struct eap_sm *sm, void *priv);
/**
* init_for_reauth - Prepare for start of fast re-authentication
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
*
* This function is an optional handler that only EAP methods
* supporting fast re-authentication need to implement. This is called
* when EAP authentication is started and EAP state machine is
* requesting fast re-authentication to be used.
*/
void * (*init_for_reauth)(struct eap_sm *sm, void *priv);
/**
* get_identity - Get method specific identity for re-authentication
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* @len: Length of the returned identity
* Returns: Pointer to the method specific identity or %NULL if default
* identity is to be used
*
* This function is an optional handler that only EAP methods
* that use method specific identity need to implement.
*/
const u8 * (*get_identity)(struct eap_sm *sm, void *priv, size_t *len);
/**
* free - Free EAP method data
* @method: Pointer to the method data registered with
* eap_peer_method_register().
*
* This function will be called when the EAP method is being
* unregistered. If the EAP method allocated resources during
* registration (e.g., allocated struct eap_method), they should be
* freed in this function. No other method functions will be called
* after this call. If this function is not defined (i.e., function
* pointer is %NULL), a default handler is used to release the method
* data with free(method). This is suitable for most cases.
*/
void (*free)(struct eap_method *method);
#define EAP_PEER_METHOD_INTERFACE_VERSION 1
/**
* version - Version of the EAP peer method interface
*
* The EAP peer method implementation should set this variable to
* EAP_PEER_METHOD_INTERFACE_VERSION. This is used to verify that the
* EAP method is using supported API version when using dynamically
* loadable EAP methods.
*/
int version;
/**
* next - Pointer to the next EAP method
*
* This variable is used internally in the EAP method registration code
* to create a linked list of registered EAP methods.
*/
struct eap_method *next;
#ifdef CONFIG_DYNAMIC_EAP_METHODS
/**
* dl_handle - Handle for the dynamic library
*
* This variable is used internally in the EAP method registration code
* to store a handle for the dynamic library. If the method is linked
* in statically, this is %NULL.
*/
void *dl_handle;
#endif /* CONFIG_DYNAMIC_EAP_METHODS */
/**
* get_emsk - Get EAP method specific keying extended material (EMSK)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @priv: Pointer to private EAP method data from eap_method::init()
* @len: Pointer to a variable to store EMSK length
* Returns: EMSK or %NULL if not available
*
* This function can be used to get the extended keying material from
* the EAP method. The key may already be stored in the method-specific
* private data or this function may derive the key.
*/
u8 * (*get_emsk)(struct eap_sm *sm, void *priv, size_t *len);
};
/**
* struct eap_sm - EAP state machine data
*/
struct eap_sm {
enum {
EAP_INITIALIZE, EAP_DISABLED, EAP_IDLE, EAP_RECEIVED,
EAP_GET_METHOD, EAP_METHOD, EAP_SEND_RESPONSE, EAP_DISCARD,
EAP_IDENTITY, EAP_NOTIFICATION, EAP_RETRANSMIT, EAP_SUCCESS,
EAP_FAILURE
} EAP_state;
/* Long-term local variables */
EapType selectedMethod;
EapMethodState methodState;
int lastId;
u8 *lastRespData;
size_t lastRespDataLen;
EapDecision decision;
/* Short-term local variables */
Boolean rxReq;
Boolean rxSuccess;
Boolean rxFailure;
int reqId;
EapType reqMethod;
int reqVendor;
u32 reqVendorMethod;
Boolean ignore;
/* Constants */
int ClientTimeout;
/* Miscellaneous variables */
Boolean allowNotifications; /* peer state machine <-> methods */
u8 *eapRespData; /* peer to lower layer */
size_t eapRespDataLen; /* peer to lower layer */
Boolean eapKeyAvailable; /* peer to lower layer */
u8 *eapKeyData; /* peer to lower layer */
size_t eapKeyDataLen; /* peer to lower layer */
const struct eap_method *m; /* selected EAP method */
/* not defined in RFC 4137 */
Boolean changed;
void *eapol_ctx;
struct eapol_callbacks *eapol_cb;
void *eap_method_priv;
int init_phase2;
int fast_reauth;
Boolean rxResp /* LEAP only */;
Boolean leap_done;
Boolean peap_done;
u8 req_md5[16]; /* MD5() of the current EAP packet */
u8 last_md5[16]; /* MD5() of the previously received EAP packet; used
* in duplicate request detection. */
void *msg_ctx;
void *scard_ctx;
void *ssl_ctx;
unsigned int workaround;
/* Optional challenges generated in Phase 1 (EAP-FAST) */
u8 *peer_challenge, *auth_challenge;
int mschapv2_full_key; /* Request full MSCHAPv2 key */
int num_rounds;
int force_disabled;
};
const u8 * eap_hdr_validate(int vendor, EapType eap_type,
const u8 *msg, size_t msglen, size_t *plen);
const u8 * eap_get_config_identity(struct eap_sm *sm, size_t *len);
const u8 * eap_get_config_password(struct eap_sm *sm, size_t *len);
const u8 * eap_get_config_new_password(struct eap_sm *sm, size_t *len);
const u8 * eap_get_config_otp(struct eap_sm *sm, size_t *len);
void eap_clear_config_otp(struct eap_sm *sm);
struct wpa_ssid * eap_get_config(struct eap_sm *sm);
void eap_set_config_blob(struct eap_sm *sm, struct wpa_config_blob *blob);
const struct wpa_config_blob *
eap_get_config_blob(struct eap_sm *sm, const char *name);
struct eap_hdr * eap_msg_alloc(int vendor, EapType type, size_t *len,
size_t payload_len, u8 code, u8 identifier,
u8 **payload);
void eap_notify_pending(struct eap_sm *sm);
#endif /* EAP_I_H */