pppd/eap.h

   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
  27 extern "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
  81 enum 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
 105 struct 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  */
 125 typedef 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
 146 extern eap_state eap_states[];
 147
 148 void eap_authwithpeer __P((int unit, char *localname));
 149 void eap_authpeer __P((int unit, char *localname));
 150
 151 extern struct protent eap_protent;
 152
 153 #ifdef  __cplusplus
 154 }
 155 #endif
 156
 157 #endif /* PPP_EAP_H */
 158