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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 $
*/
#ifndef PPP_EAP_H
#define PPP_EAP_H
#include "pppdconf.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef PPP_EAP
#define PPP_EAP 0xc227
#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 */
#define EAPT_TTLS 21 /* EAP Tunneled TLS Authentication Protocol RFC5281 */
#define EAPT_RAS 22 /* Remote Access Service */
#define EAPT_AKA 23 /* EAP method for 3rd Generation Authentication and Key Agreement RFC4187 */
#define EAPT_3COM 24 /* EAP-3Com Wireless */
#define EAPT_PEAP 25 /* Protected EAP */
#define EAPT_MSCHAPV2 26 /* EAP-MSCHAPv2 RFC-draft-kamath-pppext-eap-mschapv2-02 */
/* OpCodes for MSCHAPv2 */
#define CHAP_CHALLENGE 1
#define CHAP_RESPONSE 2
#define CHAP_SUCCESS 3
#define CHAP_FAILURE 4
/* 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 MIN_CHALLENGE_LENGTH 16
#define MAX_CHALLENGE_LENGTH 24
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 */
eapTlsStart, /* Send EAP-TLS start packet */
eapTlsRecv, /* Receive EAP-TLS tls data */
eapTlsSendAck, /* Send EAP-TLS ack */
eapTlsSend, /* Send EAP-TLS tls data */
eapTlsRecvAck, /* Receive EAP-TLS ack */
eapTlsRecvClient, /* Receive EAP-TLS auth response from client*/
eapTlsSendAlert, /* Send EAP-TLS tls alert (server)*/
eapTlsRecvAlertAck, /* Receive EAP-TLS ack after sending alert */
eapTlsRecvSuccess, /* Receive EAP success */
eapTlsRecvFailure, /* Receive EAP failure */
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 */
eapMSCHAPv2Chall, /* Sent MSCHAPv2-Challenge */
eapOpen, /* Completed authentication */
eapSRP4, /* Sent EAP SRP-SHA1 Subtype 4 */
eapBadAuth /* Failed authentication */
};
#define EAP_STATES \
"Initial", "Pending", "Closed", "Listen", "Identify", \
"TlsStart", "TlsRecv", "TlsSendAck", "TlsSend", "TlsRecvAck", "TlsRecvClient",\
"TlsSendAlert", "TlsRecvAlertAck" , "TlsRecvSuccess", "TlsRecvFailure", \
"SRP1", "SRP2", "SRP3", "MD5Chall", "MSCHAPv2Chall", "Open", "SRP4", "BadAuth"
#ifdef PPP_WITH_EAPTLS
#define eap_client_active(esp) ((esp)->es_client.ea_state != eapInitial &&\
(esp)->es_client.ea_state != eapPending &&\
(esp)->es_client.ea_state != eapClosed)
#else
#define eap_client_active(esp) ((esp)->es_client.ea_state == eapListen)
#endif /* PPP_WITH_EAPTLS */
#define eap_server_active(esp) \
((esp)->es_server.ea_state >= eapIdentify && \
(esp)->es_server.ea_state <= eapMD5Chall)
struct eap_auth {
char *ea_name; /* Our name */
char *ea_peer; /* Peer's name */
void *ea_session; /* Authentication library linkage */
unsigned char *ea_skey; /* Shared encryption key */
int ea_timeout; /* Time to wait (for retransmit/fail) */
int ea_maxrequests; /* Max Requests allowed */
unsigned short ea_namelen; /* Length of our name */
unsigned short ea_peerlen; /* Length of peer's name */
enum eap_state_code ea_state;
#ifdef PPP_WITH_EAPTLS
enum eap_state_code ea_prev_state;
#endif
#ifdef PPP_WITH_CHAPMS
struct chap_digest_type *digest;
#endif
unsigned char ea_id; /* Current id */
unsigned char ea_requests; /* Number of Requests sent/received */
unsigned char ea_responses; /* Number of Responses */
unsigned char ea_type; /* One of EAPT_* */
uint32_t ea_keyflags; /* SRP shared key usage flags */
#ifdef PPP_WITH_EAPTLS
bool ea_using_eaptls;
#endif
};
/*
* Complete EAP state for one PPP session.
*/
typedef struct eap_state {
int es_unit; /* Interface unit number */
struct eap_auth es_client; /* Client (authenticatee) data */
struct eap_auth es_server; /* Server (authenticator) data */
#ifdef PPP_WITH_PEAP
struct peap_state *ea_peap; /* Client PEAP (authenticator) data */
#endif
int es_savedtime; /* Saved timeout */
int es_rechallenge; /* EAP rechallenge interval */
int es_lwrechallenge; /* SRP lightweight rechallenge inter */
bool es_usepseudo; /* Use SRP Pseudonym if offered one */
int es_usedpseudo; /* Set if we already sent PN */
int es_challen; /* Length of challenge string */
unsigned char es_challenge[MAX_CHALLENGE_LENGTH];
} eap_state;
/*
* Timeouts.
*/
#define EAP_DEFTIMEOUT 3 /* Timeout (seconds) for rexmit */
#ifdef PPP_WITH_EAPTLS
#define EAP_DEFTRANSMITS 30 /* max # times to transmit */
/* certificates can be long ... */
#else
#define EAP_DEFTRANSMITS 10 /* max # times to transmit */
#endif /* PPP_WITH_EAPTLS */
#define EAP_DEFREQTIME 20 /* Time to wait for peer request */
#define EAP_DEFALLOWREQ 20 /* max # times to accept requests */
extern eap_state eap_states[];
void eap_authwithpeer (int unit, char *localname);
void eap_authpeer (int unit, char *localname);
extern struct protent eap_protent;
#ifdef PPP_WITH_EAPTLS
typedef int (eaptls_passwd_hook_fn)(char *user, char *passwd);
extern eaptls_passwd_hook_fn *eaptls_passwd_hook;
#endif
#ifdef __cplusplus
}
#endif
#endif /* PPP_EAP_H */
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