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/*
* eap.h - Extensible Authentication Protocol for PPP (RFC 2284)
*
* Copyright (c) 2001 by Sun Microsystems, Inc.
* All rights reserved.
*
* Non-exclusive rights to redistribute, modify, translate, and use
* this software in source and binary forms, in whole or in part, is
* hereby granted, provided that the above copyright notice is
* duplicated in any source form, and that neither the name of the
* copyright holder nor the author is used to endorse or promote
* products derived from this software.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Original version by James Carlson
*
* $Id: eap.h,v 1.2 2003/06/11 23:56:26 paulus Exp $
*/
#include "netif/ppp/ppp_opts.h"
#if PPP_SUPPORT && EAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
#ifndef PPP_EAP_H
#define PPP_EAP_H
#include "ppp.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* Packet header = Code, id, length.
*/
#define EAP_HEADERLEN 4
/* EAP message codes. */
#define EAP_REQUEST 1
#define EAP_RESPONSE 2
#define EAP_SUCCESS 3
#define EAP_FAILURE 4
/* EAP types */
#define EAPT_IDENTITY 1
#define EAPT_NOTIFICATION 2
#define EAPT_NAK 3 /* (response only) */
#define EAPT_MD5CHAP 4
#define EAPT_OTP 5 /* One-Time Password; RFC 1938 */
#define EAPT_TOKEN 6 /* Generic Token Card */
/* 7 and 8 are unassigned. */
#define EAPT_RSA 9 /* RSA Public Key Authentication */
#define EAPT_DSS 10 /* DSS Unilateral */
#define EAPT_KEA 11 /* KEA */
#define EAPT_KEA_VALIDATE 12 /* KEA-VALIDATE */
#define EAPT_TLS 13 /* EAP-TLS */
#define EAPT_DEFENDER 14 /* Defender Token (AXENT) */
#define EAPT_W2K 15 /* Windows 2000 EAP */
#define EAPT_ARCOT 16 /* Arcot Systems */
#define EAPT_CISCOWIRELESS 17 /* Cisco Wireless */
#define EAPT_NOKIACARD 18 /* Nokia IP smart card */
#define EAPT_SRP 19 /* Secure Remote Password */
/* 20 is deprecated */
/* EAP SRP-SHA1 Subtypes */
#define EAPSRP_CHALLENGE 1 /* Request 1 - Challenge */
#define EAPSRP_CKEY 1 /* Response 1 - Client Key */
#define EAPSRP_SKEY 2 /* Request 2 - Server Key */
#define EAPSRP_CVALIDATOR 2 /* Response 2 - Client Validator */
#define EAPSRP_SVALIDATOR 3 /* Request 3 - Server Validator */
#define EAPSRP_ACK 3 /* Response 3 - final ack */
#define EAPSRP_LWRECHALLENGE 4 /* Req/resp 4 - Lightweight rechal */
#define SRPVAL_EBIT 0x00000001 /* Use shared key for ECP */
#define SRP_PSEUDO_ID "pseudo_"
#define SRP_PSEUDO_LEN 7
#define MD5_SIGNATURE_SIZE 16
#define EAP_MIN_CHALLENGE_LENGTH 17
#define EAP_MAX_CHALLENGE_LENGTH 24
#define EAP_MIN_MAX_POWER_OF_TWO_CHALLENGE_LENGTH 3 /* 2^3-1 = 7, 17+7 = 24 */
#define EAP_STATES \
"Initial", "Pending", "Closed", "Listen", "Identify", \
"SRP1", "SRP2", "SRP3", "MD5Chall", "Open", "SRP4", "BadAuth"
#define eap_client_active(pcb) ((pcb)->eap.es_client.ea_state == eapListen)
#if PPP_SERVER
#define eap_server_active(pcb) \
((pcb)->eap.es_server.ea_state >= eapIdentify && \
(pcb)->eap.es_server.ea_state <= eapMD5Chall)
#endif /* PPP_SERVER */
/*
* Complete EAP state for one PPP session.
*/
enum eap_state_code {
eapInitial = 0, /* No EAP authentication yet requested */
eapPending, /* Waiting for LCP (no timer) */
eapClosed, /* Authentication not in use */
eapListen, /* Client ready (and timer running) */
eapIdentify, /* EAP Identify sent */
eapSRP1, /* Sent EAP SRP-SHA1 Subtype 1 */
eapSRP2, /* Sent EAP SRP-SHA1 Subtype 2 */
eapSRP3, /* Sent EAP SRP-SHA1 Subtype 3 */
eapMD5Chall, /* Sent MD5-Challenge */
eapOpen, /* Completed authentication */
eapSRP4, /* Sent EAP SRP-SHA1 Subtype 4 */
eapBadAuth /* Failed authentication */
};
struct eap_auth {
const char *ea_name; /* Our name */
char ea_peer[MAXNAMELEN +1]; /* Peer's name */
void *ea_session; /* Authentication library linkage */
u_char *ea_skey; /* Shared encryption key */
u_short ea_namelen; /* Length of our name */
u_short ea_peerlen; /* Length of peer's name */
enum eap_state_code ea_state;
u_char ea_id; /* Current id */
u_char ea_requests; /* Number of Requests sent/received */
u_char ea_responses; /* Number of Responses */
u_char ea_type; /* One of EAPT_* */
u32_t ea_keyflags; /* SRP shared key usage flags */
};
#ifndef EAP_MAX_CHALLENGE_LENGTH
#define EAP_MAX_CHALLENGE_LENGTH 24
#endif
typedef struct eap_state {
struct eap_auth es_client; /* Client (authenticatee) data */
#if PPP_SERVER
struct eap_auth es_server; /* Server (authenticator) data */
#endif /* PPP_SERVER */
int es_savedtime; /* Saved timeout */
int es_rechallenge; /* EAP rechallenge interval */
int es_lwrechallenge; /* SRP lightweight rechallenge inter */
u8_t es_usepseudo; /* Use SRP Pseudonym if offered one */
int es_usedpseudo; /* Set if we already sent PN */
int es_challen; /* Length of challenge string */
u_char es_challenge[EAP_MAX_CHALLENGE_LENGTH];
} eap_state;
/*
* Timeouts.
*/
#if 0 /* moved to ppp_opts.h */
#define EAP_DEFTIMEOUT 3 /* Timeout (seconds) for rexmit */
#define EAP_DEFTRANSMITS 10 /* max # times to transmit */
#define EAP_DEFREQTIME 20 /* Time to wait for peer request */
#define EAP_DEFALLOWREQ 20 /* max # times to accept requests */
#endif /* moved to ppp_opts.h */
void eap_authwithpeer(ppp_pcb *pcb, const char *localname);
void eap_authpeer(ppp_pcb *pcb, const char *localname);
extern const struct protent eap_protent;
#ifdef __cplusplus
}
#endif
#endif /* PPP_EAP_H */
#endif /* PPP_SUPPORT && EAP_SUPPORT */
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