1/* 2 * eap.h - Extensible Authentication Protocol for PPP (RFC 2284) 3 * 4 * Copyright (c) 2001 by Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Non-exclusive rights to redistribute, modify, translate, and use 8 * this software in source and binary forms, in whole or in part, is 9 * hereby granted, provided that the above copyright notice is 10 * duplicated in any source form, and that neither the name of the 11 * copyright holder nor the author is used to endorse or promote 12 * products derived from this software. 13 * 14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 17 * 18 * Original version by James Carlson 19 * 20 * $Id: eap.h,v 1.2 2003/06/11 23:56:26 paulus Exp $ 21 */ 22 23#ifndef PPP_EAP_H 24#define PPP_EAP_H 25 26#ifdef __cplusplus 27extern "C" { 28#endif 29 30/* 31 * Packet header = Code, id, length. 32 */ 33#define EAP_HEADERLEN 4 34 35 36/* EAP message codes. */ 37#define EAP_REQUEST 1 38#define EAP_RESPONSE 2 39#define EAP_SUCCESS 3 40#define EAP_FAILURE 4 41 42/* EAP types */ 43#define EAPT_IDENTITY 1 44#define EAPT_NOTIFICATION 2 45#define EAPT_NAK 3 /* (response only) */ 46#define EAPT_MD5CHAP 4 47#define EAPT_OTP 5 /* One-Time Password; RFC 1938 */ 48#define EAPT_TOKEN 6 /* Generic Token Card */ 49/* 7 and 8 are unassigned. */ 50#define EAPT_RSA 9 /* RSA Public Key Authentication */ 51#define EAPT_DSS 10 /* DSS Unilateral */ 52#define EAPT_KEA 11 /* KEA */ 53#define EAPT_KEA_VALIDATE 12 /* KEA-VALIDATE */ 54#define EAPT_TLS 13 /* EAP-TLS */ 55#define EAPT_DEFENDER 14 /* Defender Token (AXENT) */ 56#define EAPT_W2K 15 /* Windows 2000 EAP */ 57#define EAPT_ARCOT 16 /* Arcot Systems */ 58#define EAPT_CISCOWIRELESS 17 /* Cisco Wireless */ 59#define EAPT_NOKIACARD 18 /* Nokia IP smart card */ 60#define EAPT_SRP 19 /* Secure Remote Password */ 61/* 20 is deprecated */ 62 63/* EAP SRP-SHA1 Subtypes */ 64#define EAPSRP_CHALLENGE 1 /* Request 1 - Challenge */ 65#define EAPSRP_CKEY 1 /* Response 1 - Client Key */ 66#define EAPSRP_SKEY 2 /* Request 2 - Server Key */ 67#define EAPSRP_CVALIDATOR 2 /* Response 2 - Client Validator */ 68#define EAPSRP_SVALIDATOR 3 /* Request 3 - Server Validator */ 69#define EAPSRP_ACK 3 /* Response 3 - final ack */ 70#define EAPSRP_LWRECHALLENGE 4 /* Req/resp 4 - Lightweight rechal */ 71 72#define SRPVAL_EBIT 0x00000001 /* Use shared key for ECP */ 73 74#define SRP_PSEUDO_ID "pseudo_" 75#define SRP_PSEUDO_LEN 7 76 77#define MD5_SIGNATURE_SIZE 16 78#define MIN_CHALLENGE_LENGTH 16 79#define MAX_CHALLENGE_LENGTH 24 80 81enum eap_state_code { 82 eapInitial = 0, /* No EAP authentication yet requested */ 83 eapPending, /* Waiting for LCP (no timer) */ 84 eapClosed, /* Authentication not in use */ 85 eapListen, /* Client ready (and timer running) */ 86 eapIdentify, /* EAP Identify sent */ 87 eapSRP1, /* Sent EAP SRP-SHA1 Subtype 1 */ 88 eapSRP2, /* Sent EAP SRP-SHA1 Subtype 2 */ 89 eapSRP3, /* Sent EAP SRP-SHA1 Subtype 3 */ 90 eapMD5Chall, /* Sent MD5-Challenge */ 91 eapOpen, /* Completed authentication */ 92 eapSRP4, /* Sent EAP SRP-SHA1 Subtype 4 */ 93 eapBadAuth /* Failed authentication */ 94}; 95 96#define EAP_STATES \ 97 "Initial", "Pending", "Closed", "Listen", "Identify", \ 98 "SRP1", "SRP2", "SRP3", "MD5Chall", "Open", "SRP4", "BadAuth" 99 100#define eap_client_active(esp) ((esp)->es_client.ea_state == eapListen) 101#define eap_server_active(esp) \ 102 ((esp)->es_server.ea_state >= eapIdentify && \ 103 (esp)->es_server.ea_state <= eapMD5Chall) 104 105struct eap_auth { 106 char *ea_name; /* Our name */ 107 char *ea_peer; /* Peer's name */ 108 void *ea_session; /* Authentication library linkage */ 109 u_char *ea_skey; /* Shared encryption key */ 110 int ea_timeout; /* Time to wait (for retransmit/fail) */ 111 int ea_maxrequests; /* Max Requests allowed */ 112 u_short ea_namelen; /* Length of our name */ 113 u_short ea_peerlen; /* Length of peer's name */ 114 enum eap_state_code ea_state; 115 u_char ea_id; /* Current id */ 116 u_char ea_requests; /* Number of Requests sent/received */ 117 u_char ea_responses; /* Number of Responses */ 118 u_char ea_type; /* One of EAPT_* */ 119 u_int32_t ea_keyflags; /* SRP shared key usage flags */ 120}; 121 122/* 123 * Complete EAP state for one PPP session. 124 */ 125typedef struct eap_state { 126 int es_unit; /* Interface unit number */ 127 struct eap_auth es_client; /* Client (authenticatee) data */ 128 struct eap_auth es_server; /* Server (authenticator) data */ 129 int es_savedtime; /* Saved timeout */ 130 int es_rechallenge; /* EAP rechallenge interval */ 131 int es_lwrechallenge; /* SRP lightweight rechallenge inter */ 132 bool es_usepseudo; /* Use SRP Pseudonym if offered one */ 133 int es_usedpseudo; /* Set if we already sent PN */ 134 int es_challen; /* Length of challenge string */ 135 u_char es_challenge[MAX_CHALLENGE_LENGTH]; 136} eap_state; 137 138/* 139 * Timeouts. 140 */ 141#define EAP_DEFTIMEOUT 3 /* Timeout (seconds) for rexmit */ 142#define EAP_DEFTRANSMITS 10 /* max # times to transmit */ 143#define EAP_DEFREQTIME 20 /* Time to wait for peer request */ 144#define EAP_DEFALLOWREQ 20 /* max # times to accept requests */ 145 146extern eap_state eap_states[]; 147 148void eap_authwithpeer __P((int unit, char *localname)); 149void eap_authpeer __P((int unit, char *localname)); 150 151extern struct protent eap_protent; 152 153#ifdef __cplusplus 154} 155#endif 156 157#endif /* PPP_EAP_H */ 158 159