Hendrik Vincent / Mbed 2 deprecated Weerstation

Leest de waarde van een sensor binnen een maakt deze beschikbaar via internet

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NetServices/lwip/netif/ppp/chap.c@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
hendrikvincent 0:05ccbd4f84f1 2 /*****************************************************************************
hendrikvincent 0:05ccbd4f84f1 3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
hendrikvincent 0:05ccbd4f84f1 4 *
hendrikvincent 0:05ccbd4f84f1 5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
hendrikvincent 0:05ccbd4f84f1 6 * portions Copyright (c) 1997 by Global Election Systems Inc.
hendrikvincent 0:05ccbd4f84f1 7 *
hendrikvincent 0:05ccbd4f84f1 8 * The authors hereby grant permission to use, copy, modify, distribute,
hendrikvincent 0:05ccbd4f84f1 9 * and license this software and its documentation for any purpose, provided
hendrikvincent 0:05ccbd4f84f1 10 * that existing copyright notices are retained in all copies and that this
hendrikvincent 0:05ccbd4f84f1 11 * notice and the following disclaimer are included verbatim in any
hendrikvincent 0:05ccbd4f84f1 12 * distributions. No written agreement, license, or royalty fee is required
hendrikvincent 0:05ccbd4f84f1 13 * for any of the authorized uses.
hendrikvincent 0:05ccbd4f84f1 14 *
hendrikvincent 0:05ccbd4f84f1 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
hendrikvincent 0:05ccbd4f84f1 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
hendrikvincent 0:05ccbd4f84f1 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
hendrikvincent 0:05ccbd4f84f1 18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
hendrikvincent 0:05ccbd4f84f1 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
hendrikvincent 0:05ccbd4f84f1 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
hendrikvincent 0:05ccbd4f84f1 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
hendrikvincent 0:05ccbd4f84f1 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
hendrikvincent 0:05ccbd4f84f1 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
hendrikvincent 0:05ccbd4f84f1 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
hendrikvincent 0:05ccbd4f84f1 25 *
hendrikvincent 0:05ccbd4f84f1 26 ******************************************************************************
hendrikvincent 0:05ccbd4f84f1 27 * REVISION HISTORY
hendrikvincent 0:05ccbd4f84f1 28 *
hendrikvincent 0:05ccbd4f84f1 29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
hendrikvincent 0:05ccbd4f84f1 30 * Ported to lwIP.
hendrikvincent 0:05ccbd4f84f1 31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
hendrikvincent 0:05ccbd4f84f1 32 * Original based on BSD chap.c.
hendrikvincent 0:05ccbd4f84f1 33 *****************************************************************************/
hendrikvincent 0:05ccbd4f84f1 34 /*
hendrikvincent 0:05ccbd4f84f1 35 * chap.c - Challenge Handshake Authentication Protocol.
hendrikvincent 0:05ccbd4f84f1 36 *
hendrikvincent 0:05ccbd4f84f1 37 * Copyright (c) 1993 The Australian National University.
hendrikvincent 0:05ccbd4f84f1 38 * All rights reserved.
hendrikvincent 0:05ccbd4f84f1 39 *
hendrikvincent 0:05ccbd4f84f1 40 * Redistribution and use in source and binary forms are permitted
hendrikvincent 0:05ccbd4f84f1 41 * provided that the above copyright notice and this paragraph are
hendrikvincent 0:05ccbd4f84f1 42 * duplicated in all such forms and that any documentation,
hendrikvincent 0:05ccbd4f84f1 43 * advertising materials, and other materials related to such
hendrikvincent 0:05ccbd4f84f1 44 * distribution and use acknowledge that the software was developed
hendrikvincent 0:05ccbd4f84f1 45 * by the Australian National University. The name of the University
hendrikvincent 0:05ccbd4f84f1 46 * may not be used to endorse or promote products derived from this
hendrikvincent 0:05ccbd4f84f1 47 * software without specific prior written permission.
hendrikvincent 0:05ccbd4f84f1 48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
hendrikvincent 0:05ccbd4f84f1 49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
hendrikvincent 0:05ccbd4f84f1 50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
hendrikvincent 0:05ccbd4f84f1 51 *
hendrikvincent 0:05ccbd4f84f1 52 * Copyright (c) 1991 Gregory M. Christy.
hendrikvincent 0:05ccbd4f84f1 53 * All rights reserved.
hendrikvincent 0:05ccbd4f84f1 54 *
hendrikvincent 0:05ccbd4f84f1 55 * Redistribution and use in source and binary forms are permitted
hendrikvincent 0:05ccbd4f84f1 56 * provided that the above copyright notice and this paragraph are
hendrikvincent 0:05ccbd4f84f1 57 * duplicated in all such forms and that any documentation,
hendrikvincent 0:05ccbd4f84f1 58 * advertising materials, and other materials related to such
hendrikvincent 0:05ccbd4f84f1 59 * distribution and use acknowledge that the software was developed
hendrikvincent 0:05ccbd4f84f1 60 * by Gregory M. Christy. The name of the author may not be used to
hendrikvincent 0:05ccbd4f84f1 61 * endorse or promote products derived from this software without
hendrikvincent 0:05ccbd4f84f1 62 * specific prior written permission.
hendrikvincent 0:05ccbd4f84f1 63 *
hendrikvincent 0:05ccbd4f84f1 64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
hendrikvincent 0:05ccbd4f84f1 65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
hendrikvincent 0:05ccbd4f84f1 66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
hendrikvincent 0:05ccbd4f84f1 67 */
hendrikvincent 0:05ccbd4f84f1 68
hendrikvincent 0:05ccbd4f84f1 69 #include "lwip/opt.h"
hendrikvincent 0:05ccbd4f84f1 70
hendrikvincent 0:05ccbd4f84f1 71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
hendrikvincent 0:05ccbd4f84f1 72
hendrikvincent 0:05ccbd4f84f1 73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
hendrikvincent 0:05ccbd4f84f1 74
hendrikvincent 0:05ccbd4f84f1 75 #include "ppp.h"
hendrikvincent 0:05ccbd4f84f1 76 #include "pppdebug.h"
hendrikvincent 0:05ccbd4f84f1 77
hendrikvincent 0:05ccbd4f84f1 78 #include "magic.h"
hendrikvincent 0:05ccbd4f84f1 79 #include "randm.h"
hendrikvincent 0:05ccbd4f84f1 80 #include "auth.h"
hendrikvincent 0:05ccbd4f84f1 81 #include "md5.h"
hendrikvincent 0:05ccbd4f84f1 82 #include "chap.h"
hendrikvincent 0:05ccbd4f84f1 83 #include "chpms.h"
hendrikvincent 0:05ccbd4f84f1 84
hendrikvincent 0:05ccbd4f84f1 85 #include <string.h>
hendrikvincent 0:05ccbd4f84f1 86
hendrikvincent 0:05ccbd4f84f1 87 #if 0 /* UNUSED */
hendrikvincent 0:05ccbd4f84f1 88 /*
hendrikvincent 0:05ccbd4f84f1 89 * Command-line options.
hendrikvincent 0:05ccbd4f84f1 90 */
hendrikvincent 0:05ccbd4f84f1 91 static option_t chap_option_list[] = {
hendrikvincent 0:05ccbd4f84f1 92 { "chap-restart", o_int, &chap[0].timeouttime,
hendrikvincent 0:05ccbd4f84f1 93 "Set timeout for CHAP" },
hendrikvincent 0:05ccbd4f84f1 94 { "chap-max-challenge", o_int, &chap[0].max_transmits,
hendrikvincent 0:05ccbd4f84f1 95 "Set max #xmits for challenge" },
hendrikvincent 0:05ccbd4f84f1 96 { "chap-interval", o_int, &chap[0].chal_interval,
hendrikvincent 0:05ccbd4f84f1 97 "Set interval for rechallenge" },
hendrikvincent 0:05ccbd4f84f1 98 #ifdef MSLANMAN
hendrikvincent 0:05ccbd4f84f1 99 { "ms-lanman", o_bool, &ms_lanman,
hendrikvincent 0:05ccbd4f84f1 100 "Use LanMan passwd when using MS-CHAP", 1 },
hendrikvincent 0:05ccbd4f84f1 101 #endif
hendrikvincent 0:05ccbd4f84f1 102 { NULL }
hendrikvincent 0:05ccbd4f84f1 103 };
hendrikvincent 0:05ccbd4f84f1 104 #endif /* UNUSED */
hendrikvincent 0:05ccbd4f84f1 105
hendrikvincent 0:05ccbd4f84f1 106 /*
hendrikvincent 0:05ccbd4f84f1 107 * Protocol entry points.
hendrikvincent 0:05ccbd4f84f1 108 */
hendrikvincent 0:05ccbd4f84f1 109 static void ChapInit (int);
hendrikvincent 0:05ccbd4f84f1 110 static void ChapLowerUp (int);
hendrikvincent 0:05ccbd4f84f1 111 static void ChapLowerDown (int);
hendrikvincent 0:05ccbd4f84f1 112 static void ChapInput (int, u_char *, int);
hendrikvincent 0:05ccbd4f84f1 113 static void ChapProtocolReject (int);
hendrikvincent 0:05ccbd4f84f1 114 #if PPP_ADDITIONAL_CALLBACKS
hendrikvincent 0:05ccbd4f84f1 115 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
hendrikvincent 0:05ccbd4f84f1 116 #endif
hendrikvincent 0:05ccbd4f84f1 117
hendrikvincent 0:05ccbd4f84f1 118 struct protent chap_protent = {
hendrikvincent 0:05ccbd4f84f1 119 PPP_CHAP,
hendrikvincent 0:05ccbd4f84f1 120 ChapInit,
hendrikvincent 0:05ccbd4f84f1 121 ChapInput,
hendrikvincent 0:05ccbd4f84f1 122 ChapProtocolReject,
hendrikvincent 0:05ccbd4f84f1 123 ChapLowerUp,
hendrikvincent 0:05ccbd4f84f1 124 ChapLowerDown,
hendrikvincent 0:05ccbd4f84f1 125 NULL,
hendrikvincent 0:05ccbd4f84f1 126 NULL,
hendrikvincent 0:05ccbd4f84f1 127 #if PPP_ADDITIONAL_CALLBACKS
hendrikvincent 0:05ccbd4f84f1 128 ChapPrintPkt,
hendrikvincent 0:05ccbd4f84f1 129 NULL,
hendrikvincent 0:05ccbd4f84f1 130 #endif /* PPP_ADDITIONAL_CALLBACKS */
hendrikvincent 0:05ccbd4f84f1 131 1,
hendrikvincent 0:05ccbd4f84f1 132 "CHAP",
hendrikvincent 0:05ccbd4f84f1 133 #if PPP_ADDITIONAL_CALLBACKS
hendrikvincent 0:05ccbd4f84f1 134 NULL,
hendrikvincent 0:05ccbd4f84f1 135 NULL,
hendrikvincent 0:05ccbd4f84f1 136 NULL
hendrikvincent 0:05ccbd4f84f1 137 #endif /* PPP_ADDITIONAL_CALLBACKS */
hendrikvincent 0:05ccbd4f84f1 138 };
hendrikvincent 0:05ccbd4f84f1 139
hendrikvincent 0:05ccbd4f84f1 140 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
hendrikvincent 0:05ccbd4f84f1 141
hendrikvincent 0:05ccbd4f84f1 142 static void ChapChallengeTimeout (void *);
hendrikvincent 0:05ccbd4f84f1 143 static void ChapResponseTimeout (void *);
hendrikvincent 0:05ccbd4f84f1 144 static void ChapReceiveChallenge (chap_state *, u_char *, u_char, int);
hendrikvincent 0:05ccbd4f84f1 145 static void ChapRechallenge (void *);
hendrikvincent 0:05ccbd4f84f1 146 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
hendrikvincent 0:05ccbd4f84f1 147 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
hendrikvincent 0:05ccbd4f84f1 148 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
hendrikvincent 0:05ccbd4f84f1 149 static void ChapSendStatus (chap_state *, int);
hendrikvincent 0:05ccbd4f84f1 150 static void ChapSendChallenge (chap_state *);
hendrikvincent 0:05ccbd4f84f1 151 static void ChapSendResponse (chap_state *);
hendrikvincent 0:05ccbd4f84f1 152 static void ChapGenChallenge (chap_state *);
hendrikvincent 0:05ccbd4f84f1 153
hendrikvincent 0:05ccbd4f84f1 154 /*
hendrikvincent 0:05ccbd4f84f1 155 * ChapInit - Initialize a CHAP unit.
hendrikvincent 0:05ccbd4f84f1 156 */
hendrikvincent 0:05ccbd4f84f1 157 static void
hendrikvincent 0:05ccbd4f84f1 158 ChapInit(int unit)
hendrikvincent 0:05ccbd4f84f1 159 {
hendrikvincent 0:05ccbd4f84f1 160 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 161
hendrikvincent 0:05ccbd4f84f1 162 BZERO(cstate, sizeof(*cstate));
hendrikvincent 0:05ccbd4f84f1 163 cstate->unit = unit;
hendrikvincent 0:05ccbd4f84f1 164 cstate->clientstate = CHAPCS_INITIAL;
hendrikvincent 0:05ccbd4f84f1 165 cstate->serverstate = CHAPSS_INITIAL;
hendrikvincent 0:05ccbd4f84f1 166 cstate->timeouttime = CHAP_DEFTIMEOUT;
hendrikvincent 0:05ccbd4f84f1 167 cstate->max_transmits = CHAP_DEFTRANSMITS;
hendrikvincent 0:05ccbd4f84f1 168 /* random number generator is initialized in magic_init */
hendrikvincent 0:05ccbd4f84f1 169 }
hendrikvincent 0:05ccbd4f84f1 170
hendrikvincent 0:05ccbd4f84f1 171
hendrikvincent 0:05ccbd4f84f1 172 /*
hendrikvincent 0:05ccbd4f84f1 173 * ChapAuthWithPeer - Authenticate us with our peer (start client).
hendrikvincent 0:05ccbd4f84f1 174 *
hendrikvincent 0:05ccbd4f84f1 175 */
hendrikvincent 0:05ccbd4f84f1 176 void
hendrikvincent 0:05ccbd4f84f1 177 ChapAuthWithPeer(int unit, char *our_name, u_char digest)
hendrikvincent 0:05ccbd4f84f1 178 {
hendrikvincent 0:05ccbd4f84f1 179 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 180
hendrikvincent 0:05ccbd4f84f1 181 cstate->resp_name = our_name;
hendrikvincent 0:05ccbd4f84f1 182 cstate->resp_type = digest;
hendrikvincent 0:05ccbd4f84f1 183
hendrikvincent 0:05ccbd4f84f1 184 if (cstate->clientstate == CHAPCS_INITIAL ||
hendrikvincent 0:05ccbd4f84f1 185 cstate->clientstate == CHAPCS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 186 /* lower layer isn't up - wait until later */
hendrikvincent 0:05ccbd4f84f1 187 cstate->clientstate = CHAPCS_PENDING;
hendrikvincent 0:05ccbd4f84f1 188 return;
hendrikvincent 0:05ccbd4f84f1 189 }
hendrikvincent 0:05ccbd4f84f1 190
hendrikvincent 0:05ccbd4f84f1 191 /*
hendrikvincent 0:05ccbd4f84f1 192 * We get here as a result of LCP coming up.
hendrikvincent 0:05ccbd4f84f1 193 * So even if CHAP was open before, we will
hendrikvincent 0:05ccbd4f84f1 194 * have to re-authenticate ourselves.
hendrikvincent 0:05ccbd4f84f1 195 */
hendrikvincent 0:05ccbd4f84f1 196 cstate->clientstate = CHAPCS_LISTEN;
hendrikvincent 0:05ccbd4f84f1 197 }
hendrikvincent 0:05ccbd4f84f1 198
hendrikvincent 0:05ccbd4f84f1 199
hendrikvincent 0:05ccbd4f84f1 200 /*
hendrikvincent 0:05ccbd4f84f1 201 * ChapAuthPeer - Authenticate our peer (start server).
hendrikvincent 0:05ccbd4f84f1 202 */
hendrikvincent 0:05ccbd4f84f1 203 void
hendrikvincent 0:05ccbd4f84f1 204 ChapAuthPeer(int unit, char *our_name, u_char digest)
hendrikvincent 0:05ccbd4f84f1 205 {
hendrikvincent 0:05ccbd4f84f1 206 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 207
hendrikvincent 0:05ccbd4f84f1 208 cstate->chal_name = our_name;
hendrikvincent 0:05ccbd4f84f1 209 cstate->chal_type = digest;
hendrikvincent 0:05ccbd4f84f1 210
hendrikvincent 0:05ccbd4f84f1 211 if (cstate->serverstate == CHAPSS_INITIAL ||
hendrikvincent 0:05ccbd4f84f1 212 cstate->serverstate == CHAPSS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 213 /* lower layer isn't up - wait until later */
hendrikvincent 0:05ccbd4f84f1 214 cstate->serverstate = CHAPSS_PENDING;
hendrikvincent 0:05ccbd4f84f1 215 return;
hendrikvincent 0:05ccbd4f84f1 216 }
hendrikvincent 0:05ccbd4f84f1 217
hendrikvincent 0:05ccbd4f84f1 218 ChapGenChallenge(cstate);
hendrikvincent 0:05ccbd4f84f1 219 ChapSendChallenge(cstate); /* crank it up dude! */
hendrikvincent 0:05ccbd4f84f1 220 cstate->serverstate = CHAPSS_INITIAL_CHAL;
hendrikvincent 0:05ccbd4f84f1 221 }
hendrikvincent 0:05ccbd4f84f1 222
hendrikvincent 0:05ccbd4f84f1 223
hendrikvincent 0:05ccbd4f84f1 224 /*
hendrikvincent 0:05ccbd4f84f1 225 * ChapChallengeTimeout - Timeout expired on sending challenge.
hendrikvincent 0:05ccbd4f84f1 226 */
hendrikvincent 0:05ccbd4f84f1 227 static void
hendrikvincent 0:05ccbd4f84f1 228 ChapChallengeTimeout(void *arg)
hendrikvincent 0:05ccbd4f84f1 229 {
hendrikvincent 0:05ccbd4f84f1 230 chap_state *cstate = (chap_state *) arg;
hendrikvincent 0:05ccbd4f84f1 231
hendrikvincent 0:05ccbd4f84f1 232 /* if we aren't sending challenges, don't worry. then again we */
hendrikvincent 0:05ccbd4f84f1 233 /* probably shouldn't be here either */
hendrikvincent 0:05ccbd4f84f1 234 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
hendrikvincent 0:05ccbd4f84f1 235 cstate->serverstate != CHAPSS_RECHALLENGE) {
hendrikvincent 0:05ccbd4f84f1 236 return;
hendrikvincent 0:05ccbd4f84f1 237 }
hendrikvincent 0:05ccbd4f84f1 238
hendrikvincent 0:05ccbd4f84f1 239 if (cstate->chal_transmits >= cstate->max_transmits) {
hendrikvincent 0:05ccbd4f84f1 240 /* give up on peer */
hendrikvincent 0:05ccbd4f84f1 241 CHAPDEBUG(LOG_ERR, ("Peer failed to respond to CHAP challenge\n"));
hendrikvincent 0:05ccbd4f84f1 242 cstate->serverstate = CHAPSS_BADAUTH;
hendrikvincent 0:05ccbd4f84f1 243 auth_peer_fail(cstate->unit, PPP_CHAP);
hendrikvincent 0:05ccbd4f84f1 244 return;
hendrikvincent 0:05ccbd4f84f1 245 }
hendrikvincent 0:05ccbd4f84f1 246
hendrikvincent 0:05ccbd4f84f1 247 ChapSendChallenge(cstate); /* Re-send challenge */
hendrikvincent 0:05ccbd4f84f1 248 }
hendrikvincent 0:05ccbd4f84f1 249
hendrikvincent 0:05ccbd4f84f1 250
hendrikvincent 0:05ccbd4f84f1 251 /*
hendrikvincent 0:05ccbd4f84f1 252 * ChapResponseTimeout - Timeout expired on sending response.
hendrikvincent 0:05ccbd4f84f1 253 */
hendrikvincent 0:05ccbd4f84f1 254 static void
hendrikvincent 0:05ccbd4f84f1 255 ChapResponseTimeout(void *arg)
hendrikvincent 0:05ccbd4f84f1 256 {
hendrikvincent 0:05ccbd4f84f1 257 chap_state *cstate = (chap_state *) arg;
hendrikvincent 0:05ccbd4f84f1 258
hendrikvincent 0:05ccbd4f84f1 259 /* if we aren't sending a response, don't worry. */
hendrikvincent 0:05ccbd4f84f1 260 if (cstate->clientstate != CHAPCS_RESPONSE) {
hendrikvincent 0:05ccbd4f84f1 261 return;
hendrikvincent 0:05ccbd4f84f1 262 }
hendrikvincent 0:05ccbd4f84f1 263
hendrikvincent 0:05ccbd4f84f1 264 ChapSendResponse(cstate); /* re-send response */
hendrikvincent 0:05ccbd4f84f1 265 }
hendrikvincent 0:05ccbd4f84f1 266
hendrikvincent 0:05ccbd4f84f1 267
hendrikvincent 0:05ccbd4f84f1 268 /*
hendrikvincent 0:05ccbd4f84f1 269 * ChapRechallenge - Time to challenge the peer again.
hendrikvincent 0:05ccbd4f84f1 270 */
hendrikvincent 0:05ccbd4f84f1 271 static void
hendrikvincent 0:05ccbd4f84f1 272 ChapRechallenge(void *arg)
hendrikvincent 0:05ccbd4f84f1 273 {
hendrikvincent 0:05ccbd4f84f1 274 chap_state *cstate = (chap_state *) arg;
hendrikvincent 0:05ccbd4f84f1 275
hendrikvincent 0:05ccbd4f84f1 276 /* if we aren't sending a response, don't worry. */
hendrikvincent 0:05ccbd4f84f1 277 if (cstate->serverstate != CHAPSS_OPEN) {
hendrikvincent 0:05ccbd4f84f1 278 return;
hendrikvincent 0:05ccbd4f84f1 279 }
hendrikvincent 0:05ccbd4f84f1 280
hendrikvincent 0:05ccbd4f84f1 281 ChapGenChallenge(cstate);
hendrikvincent 0:05ccbd4f84f1 282 ChapSendChallenge(cstate);
hendrikvincent 0:05ccbd4f84f1 283 cstate->serverstate = CHAPSS_RECHALLENGE;
hendrikvincent 0:05ccbd4f84f1 284 }
hendrikvincent 0:05ccbd4f84f1 285
hendrikvincent 0:05ccbd4f84f1 286
hendrikvincent 0:05ccbd4f84f1 287 /*
hendrikvincent 0:05ccbd4f84f1 288 * ChapLowerUp - The lower layer is up.
hendrikvincent 0:05ccbd4f84f1 289 *
hendrikvincent 0:05ccbd4f84f1 290 * Start up if we have pending requests.
hendrikvincent 0:05ccbd4f84f1 291 */
hendrikvincent 0:05ccbd4f84f1 292 static void
hendrikvincent 0:05ccbd4f84f1 293 ChapLowerUp(int unit)
hendrikvincent 0:05ccbd4f84f1 294 {
hendrikvincent 0:05ccbd4f84f1 295 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 296
hendrikvincent 0:05ccbd4f84f1 297 if (cstate->clientstate == CHAPCS_INITIAL) {
hendrikvincent 0:05ccbd4f84f1 298 cstate->clientstate = CHAPCS_CLOSED;
hendrikvincent 0:05ccbd4f84f1 299 } else if (cstate->clientstate == CHAPCS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 300 cstate->clientstate = CHAPCS_LISTEN;
hendrikvincent 0:05ccbd4f84f1 301 }
hendrikvincent 0:05ccbd4f84f1 302
hendrikvincent 0:05ccbd4f84f1 303 if (cstate->serverstate == CHAPSS_INITIAL) {
hendrikvincent 0:05ccbd4f84f1 304 cstate->serverstate = CHAPSS_CLOSED;
hendrikvincent 0:05ccbd4f84f1 305 } else if (cstate->serverstate == CHAPSS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 306 ChapGenChallenge(cstate);
hendrikvincent 0:05ccbd4f84f1 307 ChapSendChallenge(cstate);
hendrikvincent 0:05ccbd4f84f1 308 cstate->serverstate = CHAPSS_INITIAL_CHAL;
hendrikvincent 0:05ccbd4f84f1 309 }
hendrikvincent 0:05ccbd4f84f1 310 }
hendrikvincent 0:05ccbd4f84f1 311
hendrikvincent 0:05ccbd4f84f1 312
hendrikvincent 0:05ccbd4f84f1 313 /*
hendrikvincent 0:05ccbd4f84f1 314 * ChapLowerDown - The lower layer is down.
hendrikvincent 0:05ccbd4f84f1 315 *
hendrikvincent 0:05ccbd4f84f1 316 * Cancel all timeouts.
hendrikvincent 0:05ccbd4f84f1 317 */
hendrikvincent 0:05ccbd4f84f1 318 static void
hendrikvincent 0:05ccbd4f84f1 319 ChapLowerDown(int unit)
hendrikvincent 0:05ccbd4f84f1 320 {
hendrikvincent 0:05ccbd4f84f1 321 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 322
hendrikvincent 0:05ccbd4f84f1 323 /* Timeout(s) pending? Cancel if so. */
hendrikvincent 0:05ccbd4f84f1 324 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
hendrikvincent 0:05ccbd4f84f1 325 cstate->serverstate == CHAPSS_RECHALLENGE) {
hendrikvincent 0:05ccbd4f84f1 326 UNTIMEOUT(ChapChallengeTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 327 } else if (cstate->serverstate == CHAPSS_OPEN
hendrikvincent 0:05ccbd4f84f1 328 && cstate->chal_interval != 0) {
hendrikvincent 0:05ccbd4f84f1 329 UNTIMEOUT(ChapRechallenge, cstate);
hendrikvincent 0:05ccbd4f84f1 330 }
hendrikvincent 0:05ccbd4f84f1 331 if (cstate->clientstate == CHAPCS_RESPONSE) {
hendrikvincent 0:05ccbd4f84f1 332 UNTIMEOUT(ChapResponseTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 333 }
hendrikvincent 0:05ccbd4f84f1 334 cstate->clientstate = CHAPCS_INITIAL;
hendrikvincent 0:05ccbd4f84f1 335 cstate->serverstate = CHAPSS_INITIAL;
hendrikvincent 0:05ccbd4f84f1 336 }
hendrikvincent 0:05ccbd4f84f1 337
hendrikvincent 0:05ccbd4f84f1 338
hendrikvincent 0:05ccbd4f84f1 339 /*
hendrikvincent 0:05ccbd4f84f1 340 * ChapProtocolReject - Peer doesn't grok CHAP.
hendrikvincent 0:05ccbd4f84f1 341 */
hendrikvincent 0:05ccbd4f84f1 342 static void
hendrikvincent 0:05ccbd4f84f1 343 ChapProtocolReject(int unit)
hendrikvincent 0:05ccbd4f84f1 344 {
hendrikvincent 0:05ccbd4f84f1 345 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 346
hendrikvincent 0:05ccbd4f84f1 347 if (cstate->serverstate != CHAPSS_INITIAL &&
hendrikvincent 0:05ccbd4f84f1 348 cstate->serverstate != CHAPSS_CLOSED) {
hendrikvincent 0:05ccbd4f84f1 349 auth_peer_fail(unit, PPP_CHAP);
hendrikvincent 0:05ccbd4f84f1 350 }
hendrikvincent 0:05ccbd4f84f1 351 if (cstate->clientstate != CHAPCS_INITIAL &&
hendrikvincent 0:05ccbd4f84f1 352 cstate->clientstate != CHAPCS_CLOSED) {
hendrikvincent 0:05ccbd4f84f1 353 auth_withpeer_fail(unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
hendrikvincent 0:05ccbd4f84f1 354 }
hendrikvincent 0:05ccbd4f84f1 355 ChapLowerDown(unit); /* shutdown chap */
hendrikvincent 0:05ccbd4f84f1 356 }
hendrikvincent 0:05ccbd4f84f1 357
hendrikvincent 0:05ccbd4f84f1 358
hendrikvincent 0:05ccbd4f84f1 359 /*
hendrikvincent 0:05ccbd4f84f1 360 * ChapInput - Input CHAP packet.
hendrikvincent 0:05ccbd4f84f1 361 */
hendrikvincent 0:05ccbd4f84f1 362 static void
hendrikvincent 0:05ccbd4f84f1 363 ChapInput(int unit, u_char *inpacket, int packet_len)
hendrikvincent 0:05ccbd4f84f1 364 {
hendrikvincent 0:05ccbd4f84f1 365 chap_state *cstate = &chap[unit];
hendrikvincent 0:05ccbd4f84f1 366 u_char *inp;
hendrikvincent 0:05ccbd4f84f1 367 u_char code, id;
hendrikvincent 0:05ccbd4f84f1 368 int len;
hendrikvincent 0:05ccbd4f84f1 369
hendrikvincent 0:05ccbd4f84f1 370 /*
hendrikvincent 0:05ccbd4f84f1 371 * Parse header (code, id and length).
hendrikvincent 0:05ccbd4f84f1 372 * If packet too short, drop it.
hendrikvincent 0:05ccbd4f84f1 373 */
hendrikvincent 0:05ccbd4f84f1 374 inp = inpacket;
hendrikvincent 0:05ccbd4f84f1 375 if (packet_len < CHAP_HEADERLEN) {
hendrikvincent 0:05ccbd4f84f1 376 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short header.\n"));
hendrikvincent 0:05ccbd4f84f1 377 return;
hendrikvincent 0:05ccbd4f84f1 378 }
hendrikvincent 0:05ccbd4f84f1 379 GETCHAR(code, inp);
hendrikvincent 0:05ccbd4f84f1 380 GETCHAR(id, inp);
hendrikvincent 0:05ccbd4f84f1 381 GETSHORT(len, inp);
hendrikvincent 0:05ccbd4f84f1 382 if (len < CHAP_HEADERLEN) {
hendrikvincent 0:05ccbd4f84f1 383 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd illegal length.\n"));
hendrikvincent 0:05ccbd4f84f1 384 return;
hendrikvincent 0:05ccbd4f84f1 385 }
hendrikvincent 0:05ccbd4f84f1 386 if (len > packet_len) {
hendrikvincent 0:05ccbd4f84f1 387 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short packet.\n"));
hendrikvincent 0:05ccbd4f84f1 388 return;
hendrikvincent 0:05ccbd4f84f1 389 }
hendrikvincent 0:05ccbd4f84f1 390 len -= CHAP_HEADERLEN;
hendrikvincent 0:05ccbd4f84f1 391
hendrikvincent 0:05ccbd4f84f1 392 /*
hendrikvincent 0:05ccbd4f84f1 393 * Action depends on code (as in fact it usually does :-).
hendrikvincent 0:05ccbd4f84f1 394 */
hendrikvincent 0:05ccbd4f84f1 395 switch (code) {
hendrikvincent 0:05ccbd4f84f1 396 case CHAP_CHALLENGE:
hendrikvincent 0:05ccbd4f84f1 397 ChapReceiveChallenge(cstate, inp, id, len);
hendrikvincent 0:05ccbd4f84f1 398 break;
hendrikvincent 0:05ccbd4f84f1 399
hendrikvincent 0:05ccbd4f84f1 400 case CHAP_RESPONSE:
hendrikvincent 0:05ccbd4f84f1 401 ChapReceiveResponse(cstate, inp, id, len);
hendrikvincent 0:05ccbd4f84f1 402 break;
hendrikvincent 0:05ccbd4f84f1 403
hendrikvincent 0:05ccbd4f84f1 404 case CHAP_FAILURE:
hendrikvincent 0:05ccbd4f84f1 405 ChapReceiveFailure(cstate, inp, id, len);
hendrikvincent 0:05ccbd4f84f1 406 break;
hendrikvincent 0:05ccbd4f84f1 407
hendrikvincent 0:05ccbd4f84f1 408 case CHAP_SUCCESS:
hendrikvincent 0:05ccbd4f84f1 409 ChapReceiveSuccess(cstate, inp, id, len);
hendrikvincent 0:05ccbd4f84f1 410 break;
hendrikvincent 0:05ccbd4f84f1 411
hendrikvincent 0:05ccbd4f84f1 412 default: /* Need code reject? */
hendrikvincent 0:05ccbd4f84f1 413 CHAPDEBUG(LOG_WARNING, ("Unknown CHAP code (%d) received.\n", code));
hendrikvincent 0:05ccbd4f84f1 414 break;
hendrikvincent 0:05ccbd4f84f1 415 }
hendrikvincent 0:05ccbd4f84f1 416 }
hendrikvincent 0:05ccbd4f84f1 417
hendrikvincent 0:05ccbd4f84f1 418
hendrikvincent 0:05ccbd4f84f1 419 /*
hendrikvincent 0:05ccbd4f84f1 420 * ChapReceiveChallenge - Receive Challenge and send Response.
hendrikvincent 0:05ccbd4f84f1 421 */
hendrikvincent 0:05ccbd4f84f1 422 static void
hendrikvincent 0:05ccbd4f84f1 423 ChapReceiveChallenge(chap_state *cstate, u_char *inp, u_char id, int len)
hendrikvincent 0:05ccbd4f84f1 424 {
hendrikvincent 0:05ccbd4f84f1 425 int rchallenge_len;
hendrikvincent 0:05ccbd4f84f1 426 u_char *rchallenge;
hendrikvincent 0:05ccbd4f84f1 427 int secret_len;
hendrikvincent 0:05ccbd4f84f1 428 char secret[MAXSECRETLEN];
hendrikvincent 0:05ccbd4f84f1 429 char rhostname[256];
hendrikvincent 0:05ccbd4f84f1 430 MD5_CTX mdContext;
hendrikvincent 0:05ccbd4f84f1 431 u_char hash[MD5_SIGNATURE_SIZE];
hendrikvincent 0:05ccbd4f84f1 432
hendrikvincent 0:05ccbd4f84f1 433 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: Rcvd id %d.\n", id));
hendrikvincent 0:05ccbd4f84f1 434 if (cstate->clientstate == CHAPCS_CLOSED ||
hendrikvincent 0:05ccbd4f84f1 435 cstate->clientstate == CHAPCS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 436 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: in state %d\n",
hendrikvincent 0:05ccbd4f84f1 437 cstate->clientstate));
hendrikvincent 0:05ccbd4f84f1 438 return;
hendrikvincent 0:05ccbd4f84f1 439 }
hendrikvincent 0:05ccbd4f84f1 440
hendrikvincent 0:05ccbd4f84f1 441 if (len < 2) {
hendrikvincent 0:05ccbd4f84f1 442 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
hendrikvincent 0:05ccbd4f84f1 443 return;
hendrikvincent 0:05ccbd4f84f1 444 }
hendrikvincent 0:05ccbd4f84f1 445
hendrikvincent 0:05ccbd4f84f1 446 GETCHAR(rchallenge_len, inp);
hendrikvincent 0:05ccbd4f84f1 447 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
hendrikvincent 0:05ccbd4f84f1 448 if (len < 0) {
hendrikvincent 0:05ccbd4f84f1 449 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
hendrikvincent 0:05ccbd4f84f1 450 return;
hendrikvincent 0:05ccbd4f84f1 451 }
hendrikvincent 0:05ccbd4f84f1 452 rchallenge = inp;
hendrikvincent 0:05ccbd4f84f1 453 INCPTR(rchallenge_len, inp);
hendrikvincent 0:05ccbd4f84f1 454
hendrikvincent 0:05ccbd4f84f1 455 if (len >= (int)sizeof(rhostname)) {
hendrikvincent 0:05ccbd4f84f1 456 len = sizeof(rhostname) - 1;
hendrikvincent 0:05ccbd4f84f1 457 }
hendrikvincent 0:05ccbd4f84f1 458 BCOPY(inp, rhostname, len);
hendrikvincent 0:05ccbd4f84f1 459 rhostname[len] = '\000';
hendrikvincent 0:05ccbd4f84f1 460
hendrikvincent 0:05ccbd4f84f1 461 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: received name field '%s'\n",
hendrikvincent 0:05ccbd4f84f1 462 rhostname));
hendrikvincent 0:05ccbd4f84f1 463
hendrikvincent 0:05ccbd4f84f1 464 /* Microsoft doesn't send their name back in the PPP packet */
hendrikvincent 0:05ccbd4f84f1 465 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
hendrikvincent 0:05ccbd4f84f1 466 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
hendrikvincent 0:05ccbd4f84f1 467 rhostname[sizeof(rhostname) - 1] = 0;
hendrikvincent 0:05ccbd4f84f1 468 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: using '%s' as remote name\n",
hendrikvincent 0:05ccbd4f84f1 469 rhostname));
hendrikvincent 0:05ccbd4f84f1 470 }
hendrikvincent 0:05ccbd4f84f1 471
hendrikvincent 0:05ccbd4f84f1 472 /* get secret for authenticating ourselves with the specified host */
hendrikvincent 0:05ccbd4f84f1 473 if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
hendrikvincent 0:05ccbd4f84f1 474 secret, &secret_len, 0)) {
hendrikvincent 0:05ccbd4f84f1 475 secret_len = 0; /* assume null secret if can't find one */
hendrikvincent 0:05ccbd4f84f1 476 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating us to %s\n",
hendrikvincent 0:05ccbd4f84f1 477 rhostname));
hendrikvincent 0:05ccbd4f84f1 478 }
hendrikvincent 0:05ccbd4f84f1 479
hendrikvincent 0:05ccbd4f84f1 480 /* cancel response send timeout if necessary */
hendrikvincent 0:05ccbd4f84f1 481 if (cstate->clientstate == CHAPCS_RESPONSE) {
hendrikvincent 0:05ccbd4f84f1 482 UNTIMEOUT(ChapResponseTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 483 }
hendrikvincent 0:05ccbd4f84f1 484
hendrikvincent 0:05ccbd4f84f1 485 cstate->resp_id = id;
hendrikvincent 0:05ccbd4f84f1 486 cstate->resp_transmits = 0;
hendrikvincent 0:05ccbd4f84f1 487
hendrikvincent 0:05ccbd4f84f1 488 /* generate MD based on negotiated type */
hendrikvincent 0:05ccbd4f84f1 489 switch (cstate->resp_type) {
hendrikvincent 0:05ccbd4f84f1 490
hendrikvincent 0:05ccbd4f84f1 491 case CHAP_DIGEST_MD5:
hendrikvincent 0:05ccbd4f84f1 492 MD5Init(&mdContext);
hendrikvincent 0:05ccbd4f84f1 493 MD5Update(&mdContext, &cstate->resp_id, 1);
hendrikvincent 0:05ccbd4f84f1 494 MD5Update(&mdContext, (u_char*)secret, secret_len);
hendrikvincent 0:05ccbd4f84f1 495 MD5Update(&mdContext, rchallenge, rchallenge_len);
hendrikvincent 0:05ccbd4f84f1 496 MD5Final(hash, &mdContext);
hendrikvincent 0:05ccbd4f84f1 497 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
hendrikvincent 0:05ccbd4f84f1 498 cstate->resp_length = MD5_SIGNATURE_SIZE;
hendrikvincent 0:05ccbd4f84f1 499 break;
hendrikvincent 0:05ccbd4f84f1 500
hendrikvincent 0:05ccbd4f84f1 501 #if MSCHAP_SUPPORT
hendrikvincent 0:05ccbd4f84f1 502 case CHAP_MICROSOFT:
hendrikvincent 0:05ccbd4f84f1 503 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
hendrikvincent 0:05ccbd4f84f1 504 break;
hendrikvincent 0:05ccbd4f84f1 505 #endif
hendrikvincent 0:05ccbd4f84f1 506
hendrikvincent 0:05ccbd4f84f1 507 default:
hendrikvincent 0:05ccbd4f84f1 508 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->resp_type));
hendrikvincent 0:05ccbd4f84f1 509 return;
hendrikvincent 0:05ccbd4f84f1 510 }
hendrikvincent 0:05ccbd4f84f1 511
hendrikvincent 0:05ccbd4f84f1 512 BZERO(secret, sizeof(secret));
hendrikvincent 0:05ccbd4f84f1 513 ChapSendResponse(cstate);
hendrikvincent 0:05ccbd4f84f1 514 }
hendrikvincent 0:05ccbd4f84f1 515
hendrikvincent 0:05ccbd4f84f1 516
hendrikvincent 0:05ccbd4f84f1 517 /*
hendrikvincent 0:05ccbd4f84f1 518 * ChapReceiveResponse - Receive and process response.
hendrikvincent 0:05ccbd4f84f1 519 */
hendrikvincent 0:05ccbd4f84f1 520 static void
hendrikvincent 0:05ccbd4f84f1 521 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
hendrikvincent 0:05ccbd4f84f1 522 {
hendrikvincent 0:05ccbd4f84f1 523 u_char *remmd, remmd_len;
hendrikvincent 0:05ccbd4f84f1 524 int secret_len, old_state;
hendrikvincent 0:05ccbd4f84f1 525 int code;
hendrikvincent 0:05ccbd4f84f1 526 char rhostname[256];
hendrikvincent 0:05ccbd4f84f1 527 MD5_CTX mdContext;
hendrikvincent 0:05ccbd4f84f1 528 char secret[MAXSECRETLEN];
hendrikvincent 0:05ccbd4f84f1 529 u_char hash[MD5_SIGNATURE_SIZE];
hendrikvincent 0:05ccbd4f84f1 530
hendrikvincent 0:05ccbd4f84f1 531 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: Rcvd id %d.\n", id));
hendrikvincent 0:05ccbd4f84f1 532
hendrikvincent 0:05ccbd4f84f1 533 if (cstate->serverstate == CHAPSS_CLOSED ||
hendrikvincent 0:05ccbd4f84f1 534 cstate->serverstate == CHAPSS_PENDING) {
hendrikvincent 0:05ccbd4f84f1 535 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: in state %d\n",
hendrikvincent 0:05ccbd4f84f1 536 cstate->serverstate));
hendrikvincent 0:05ccbd4f84f1 537 return;
hendrikvincent 0:05ccbd4f84f1 538 }
hendrikvincent 0:05ccbd4f84f1 539
hendrikvincent 0:05ccbd4f84f1 540 if (id != cstate->chal_id) {
hendrikvincent 0:05ccbd4f84f1 541 return; /* doesn't match ID of last challenge */
hendrikvincent 0:05ccbd4f84f1 542 }
hendrikvincent 0:05ccbd4f84f1 543
hendrikvincent 0:05ccbd4f84f1 544 /*
hendrikvincent 0:05ccbd4f84f1 545 * If we have received a duplicate or bogus Response,
hendrikvincent 0:05ccbd4f84f1 546 * we have to send the same answer (Success/Failure)
hendrikvincent 0:05ccbd4f84f1 547 * as we did for the first Response we saw.
hendrikvincent 0:05ccbd4f84f1 548 */
hendrikvincent 0:05ccbd4f84f1 549 if (cstate->serverstate == CHAPSS_OPEN) {
hendrikvincent 0:05ccbd4f84f1 550 ChapSendStatus(cstate, CHAP_SUCCESS);
hendrikvincent 0:05ccbd4f84f1 551 return;
hendrikvincent 0:05ccbd4f84f1 552 }
hendrikvincent 0:05ccbd4f84f1 553 if (cstate->serverstate == CHAPSS_BADAUTH) {
hendrikvincent 0:05ccbd4f84f1 554 ChapSendStatus(cstate, CHAP_FAILURE);
hendrikvincent 0:05ccbd4f84f1 555 return;
hendrikvincent 0:05ccbd4f84f1 556 }
hendrikvincent 0:05ccbd4f84f1 557
hendrikvincent 0:05ccbd4f84f1 558 if (len < 2) {
hendrikvincent 0:05ccbd4f84f1 559 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
hendrikvincent 0:05ccbd4f84f1 560 return;
hendrikvincent 0:05ccbd4f84f1 561 }
hendrikvincent 0:05ccbd4f84f1 562 GETCHAR(remmd_len, inp); /* get length of MD */
hendrikvincent 0:05ccbd4f84f1 563 remmd = inp; /* get pointer to MD */
hendrikvincent 0:05ccbd4f84f1 564 INCPTR(remmd_len, inp);
hendrikvincent 0:05ccbd4f84f1 565
hendrikvincent 0:05ccbd4f84f1 566 len -= sizeof (u_char) + remmd_len;
hendrikvincent 0:05ccbd4f84f1 567 if (len < 0) {
hendrikvincent 0:05ccbd4f84f1 568 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
hendrikvincent 0:05ccbd4f84f1 569 return;
hendrikvincent 0:05ccbd4f84f1 570 }
hendrikvincent 0:05ccbd4f84f1 571
hendrikvincent 0:05ccbd4f84f1 572 UNTIMEOUT(ChapChallengeTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 573
hendrikvincent 0:05ccbd4f84f1 574 if (len >= (int)sizeof(rhostname)) {
hendrikvincent 0:05ccbd4f84f1 575 len = sizeof(rhostname) - 1;
hendrikvincent 0:05ccbd4f84f1 576 }
hendrikvincent 0:05ccbd4f84f1 577 BCOPY(inp, rhostname, len);
hendrikvincent 0:05ccbd4f84f1 578 rhostname[len] = '\000';
hendrikvincent 0:05ccbd4f84f1 579
hendrikvincent 0:05ccbd4f84f1 580 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: received name field: %s\n",
hendrikvincent 0:05ccbd4f84f1 581 rhostname));
hendrikvincent 0:05ccbd4f84f1 582
hendrikvincent 0:05ccbd4f84f1 583 /*
hendrikvincent 0:05ccbd4f84f1 584 * Get secret for authenticating them with us,
hendrikvincent 0:05ccbd4f84f1 585 * do the hash ourselves, and compare the result.
hendrikvincent 0:05ccbd4f84f1 586 */
hendrikvincent 0:05ccbd4f84f1 587 code = CHAP_FAILURE;
hendrikvincent 0:05ccbd4f84f1 588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
hendrikvincent 0:05ccbd4f84f1 589 secret, &secret_len, 1)) {
hendrikvincent 0:05ccbd4f84f1 590 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating %s\n",
hendrikvincent 0:05ccbd4f84f1 591 rhostname));
hendrikvincent 0:05ccbd4f84f1 592 } else {
hendrikvincent 0:05ccbd4f84f1 593 /* generate MD based on negotiated type */
hendrikvincent 0:05ccbd4f84f1 594 switch (cstate->chal_type) {
hendrikvincent 0:05ccbd4f84f1 595
hendrikvincent 0:05ccbd4f84f1 596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
hendrikvincent 0:05ccbd4f84f1 597 if (remmd_len != MD5_SIGNATURE_SIZE) {
hendrikvincent 0:05ccbd4f84f1 598 break; /* it's not even the right length */
hendrikvincent 0:05ccbd4f84f1 599 }
hendrikvincent 0:05ccbd4f84f1 600 MD5Init(&mdContext);
hendrikvincent 0:05ccbd4f84f1 601 MD5Update(&mdContext, &cstate->chal_id, 1);
hendrikvincent 0:05ccbd4f84f1 602 MD5Update(&mdContext, (u_char*)secret, secret_len);
hendrikvincent 0:05ccbd4f84f1 603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
hendrikvincent 0:05ccbd4f84f1 604 MD5Final(hash, &mdContext);
hendrikvincent 0:05ccbd4f84f1 605
hendrikvincent 0:05ccbd4f84f1 606 /* compare local and remote MDs and send the appropriate status */
hendrikvincent 0:05ccbd4f84f1 607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
hendrikvincent 0:05ccbd4f84f1 608 code = CHAP_SUCCESS; /* they are the same! */
hendrikvincent 0:05ccbd4f84f1 609 }
hendrikvincent 0:05ccbd4f84f1 610 break;
hendrikvincent 0:05ccbd4f84f1 611
hendrikvincent 0:05ccbd4f84f1 612 default:
hendrikvincent 0:05ccbd4f84f1 613 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->chal_type));
hendrikvincent 0:05ccbd4f84f1 614 }
hendrikvincent 0:05ccbd4f84f1 615 }
hendrikvincent 0:05ccbd4f84f1 616
hendrikvincent 0:05ccbd4f84f1 617 BZERO(secret, sizeof(secret));
hendrikvincent 0:05ccbd4f84f1 618 ChapSendStatus(cstate, code);
hendrikvincent 0:05ccbd4f84f1 619
hendrikvincent 0:05ccbd4f84f1 620 if (code == CHAP_SUCCESS) {
hendrikvincent 0:05ccbd4f84f1 621 old_state = cstate->serverstate;
hendrikvincent 0:05ccbd4f84f1 622 cstate->serverstate = CHAPSS_OPEN;
hendrikvincent 0:05ccbd4f84f1 623 if (old_state == CHAPSS_INITIAL_CHAL) {
hendrikvincent 0:05ccbd4f84f1 624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
hendrikvincent 0:05ccbd4f84f1 625 }
hendrikvincent 0:05ccbd4f84f1 626 if (cstate->chal_interval != 0) {
hendrikvincent 0:05ccbd4f84f1 627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
hendrikvincent 0:05ccbd4f84f1 628 }
hendrikvincent 0:05ccbd4f84f1 629 } else {
hendrikvincent 0:05ccbd4f84f1 630 CHAPDEBUG(LOG_ERR, ("CHAP peer authentication failed\n"));
hendrikvincent 0:05ccbd4f84f1 631 cstate->serverstate = CHAPSS_BADAUTH;
hendrikvincent 0:05ccbd4f84f1 632 auth_peer_fail(cstate->unit, PPP_CHAP);
hendrikvincent 0:05ccbd4f84f1 633 }
hendrikvincent 0:05ccbd4f84f1 634 }
hendrikvincent 0:05ccbd4f84f1 635
hendrikvincent 0:05ccbd4f84f1 636 /*
hendrikvincent 0:05ccbd4f84f1 637 * ChapReceiveSuccess - Receive Success
hendrikvincent 0:05ccbd4f84f1 638 */
hendrikvincent 0:05ccbd4f84f1 639 static void
hendrikvincent 0:05ccbd4f84f1 640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
hendrikvincent 0:05ccbd4f84f1 641 {
hendrikvincent 0:05ccbd4f84f1 642 LWIP_UNUSED_ARG(id);
hendrikvincent 0:05ccbd4f84f1 643 LWIP_UNUSED_ARG(inp);
hendrikvincent 0:05ccbd4f84f1 644
hendrikvincent 0:05ccbd4f84f1 645 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: Rcvd id %d.\n", id));
hendrikvincent 0:05ccbd4f84f1 646
hendrikvincent 0:05ccbd4f84f1 647 if (cstate->clientstate == CHAPCS_OPEN) {
hendrikvincent 0:05ccbd4f84f1 648 /* presumably an answer to a duplicate response */
hendrikvincent 0:05ccbd4f84f1 649 return;
hendrikvincent 0:05ccbd4f84f1 650 }
hendrikvincent 0:05ccbd4f84f1 651
hendrikvincent 0:05ccbd4f84f1 652 if (cstate->clientstate != CHAPCS_RESPONSE) {
hendrikvincent 0:05ccbd4f84f1 653 /* don't know what this is */
hendrikvincent 0:05ccbd4f84f1 654 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: in state %d\n",
hendrikvincent 0:05ccbd4f84f1 655 cstate->clientstate));
hendrikvincent 0:05ccbd4f84f1 656 return;
hendrikvincent 0:05ccbd4f84f1 657 }
hendrikvincent 0:05ccbd4f84f1 658
hendrikvincent 0:05ccbd4f84f1 659 UNTIMEOUT(ChapResponseTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 660
hendrikvincent 0:05ccbd4f84f1 661 /*
hendrikvincent 0:05ccbd4f84f1 662 * Print message.
hendrikvincent 0:05ccbd4f84f1 663 */
hendrikvincent 0:05ccbd4f84f1 664 if (len > 0) {
hendrikvincent 0:05ccbd4f84f1 665 PRINTMSG(inp, len);
hendrikvincent 0:05ccbd4f84f1 666 }
hendrikvincent 0:05ccbd4f84f1 667
hendrikvincent 0:05ccbd4f84f1 668 cstate->clientstate = CHAPCS_OPEN;
hendrikvincent 0:05ccbd4f84f1 669
hendrikvincent 0:05ccbd4f84f1 670 auth_withpeer_success(cstate->unit, PPP_CHAP);
hendrikvincent 0:05ccbd4f84f1 671 }
hendrikvincent 0:05ccbd4f84f1 672
hendrikvincent 0:05ccbd4f84f1 673
hendrikvincent 0:05ccbd4f84f1 674 /*
hendrikvincent 0:05ccbd4f84f1 675 * ChapReceiveFailure - Receive failure.
hendrikvincent 0:05ccbd4f84f1 676 */
hendrikvincent 0:05ccbd4f84f1 677 static void
hendrikvincent 0:05ccbd4f84f1 678 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
hendrikvincent 0:05ccbd4f84f1 679 {
hendrikvincent 0:05ccbd4f84f1 680 LWIP_UNUSED_ARG(id);
hendrikvincent 0:05ccbd4f84f1 681 LWIP_UNUSED_ARG(inp);
hendrikvincent 0:05ccbd4f84f1 682
hendrikvincent 0:05ccbd4f84f1 683 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: Rcvd id %d.\n", id));
hendrikvincent 0:05ccbd4f84f1 684
hendrikvincent 0:05ccbd4f84f1 685 if (cstate->clientstate != CHAPCS_RESPONSE) {
hendrikvincent 0:05ccbd4f84f1 686 /* don't know what this is */
hendrikvincent 0:05ccbd4f84f1 687 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: in state %d\n",
hendrikvincent 0:05ccbd4f84f1 688 cstate->clientstate));
hendrikvincent 0:05ccbd4f84f1 689 return;
hendrikvincent 0:05ccbd4f84f1 690 }
hendrikvincent 0:05ccbd4f84f1 691
hendrikvincent 0:05ccbd4f84f1 692 UNTIMEOUT(ChapResponseTimeout, cstate);
hendrikvincent 0:05ccbd4f84f1 693
hendrikvincent 0:05ccbd4f84f1 694 /*
hendrikvincent 0:05ccbd4f84f1 695 * Print message.
hendrikvincent 0:05ccbd4f84f1 696 */
hendrikvincent 0:05ccbd4f84f1 697 if (len > 0) {
hendrikvincent 0:05ccbd4f84f1 698 PRINTMSG(inp, len);
hendrikvincent 0:05ccbd4f84f1 699 }
hendrikvincent 0:05ccbd4f84f1 700
hendrikvincent 0:05ccbd4f84f1 701 CHAPDEBUG(LOG_ERR, ("CHAP authentication failed\n"));
hendrikvincent 0:05ccbd4f84f1 702 auth_withpeer_fail(cstate->unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
hendrikvincent 0:05ccbd4f84f1 703 }
hendrikvincent 0:05ccbd4f84f1 704
hendrikvincent 0:05ccbd4f84f1 705
hendrikvincent 0:05ccbd4f84f1 706 /*
hendrikvincent 0:05ccbd4f84f1 707 * ChapSendChallenge - Send an Authenticate challenge.
hendrikvincent 0:05ccbd4f84f1 708 */
hendrikvincent 0:05ccbd4f84f1 709 static void
hendrikvincent 0:05ccbd4f84f1 710 ChapSendChallenge(chap_state *cstate)
hendrikvincent 0:05ccbd4f84f1 711 {
hendrikvincent 0:05ccbd4f84f1 712 u_char *outp;
hendrikvincent 0:05ccbd4f84f1 713 int chal_len, name_len;
hendrikvincent 0:05ccbd4f84f1 714 int outlen;
hendrikvincent 0:05ccbd4f84f1 715
hendrikvincent 0:05ccbd4f84f1 716 chal_len = cstate->chal_len;
hendrikvincent 0:05ccbd4f84f1 717 name_len = (int)strlen(cstate->chal_name);
hendrikvincent 0:05ccbd4f84f1 718 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
hendrikvincent 0:05ccbd4f84f1 719 outp = outpacket_buf[cstate->unit];
hendrikvincent 0:05ccbd4f84f1 720
hendrikvincent 0:05ccbd4f84f1 721 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
hendrikvincent 0:05ccbd4f84f1 722
hendrikvincent 0:05ccbd4f84f1 723 PUTCHAR(CHAP_CHALLENGE, outp);
hendrikvincent 0:05ccbd4f84f1 724 PUTCHAR(cstate->chal_id, outp);
hendrikvincent 0:05ccbd4f84f1 725 PUTSHORT(outlen, outp);
hendrikvincent 0:05ccbd4f84f1 726
hendrikvincent 0:05ccbd4f84f1 727 PUTCHAR(chal_len, outp); /* put length of challenge */
hendrikvincent 0:05ccbd4f84f1 728 BCOPY(cstate->challenge, outp, chal_len);
hendrikvincent 0:05ccbd4f84f1 729 INCPTR(chal_len, outp);
hendrikvincent 0:05ccbd4f84f1 730
hendrikvincent 0:05ccbd4f84f1 731 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
hendrikvincent 0:05ccbd4f84f1 732
hendrikvincent 0:05ccbd4f84f1 733 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
hendrikvincent 0:05ccbd4f84f1 734
hendrikvincent 0:05ccbd4f84f1 735 CHAPDEBUG(LOG_INFO, ("ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
hendrikvincent 0:05ccbd4f84f1 736
hendrikvincent 0:05ccbd4f84f1 737 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
hendrikvincent 0:05ccbd4f84f1 738 ++cstate->chal_transmits;
hendrikvincent 0:05ccbd4f84f1 739 }
hendrikvincent 0:05ccbd4f84f1 740
hendrikvincent 0:05ccbd4f84f1 741
hendrikvincent 0:05ccbd4f84f1 742 /*
hendrikvincent 0:05ccbd4f84f1 743 * ChapSendStatus - Send a status response (ack or nak).
hendrikvincent 0:05ccbd4f84f1 744 */
hendrikvincent 0:05ccbd4f84f1 745 static void
hendrikvincent 0:05ccbd4f84f1 746 ChapSendStatus(chap_state *cstate, int code)
hendrikvincent 0:05ccbd4f84f1 747 {
hendrikvincent 0:05ccbd4f84f1 748 u_char *outp;
hendrikvincent 0:05ccbd4f84f1 749 int outlen, msglen;
hendrikvincent 0:05ccbd4f84f1 750 char msg[256]; /* @todo: this can be a char*, no strcpy needed */
hendrikvincent 0:05ccbd4f84f1 751
hendrikvincent 0:05ccbd4f84f1 752 if (code == CHAP_SUCCESS) {
hendrikvincent 0:05ccbd4f84f1 753 strcpy(msg, "Welcome!");
hendrikvincent 0:05ccbd4f84f1 754 } else {
hendrikvincent 0:05ccbd4f84f1 755 strcpy(msg, "I don't like you. Go 'way.");
hendrikvincent 0:05ccbd4f84f1 756 }
hendrikvincent 0:05ccbd4f84f1 757 msglen = (int)strlen(msg);
hendrikvincent 0:05ccbd4f84f1 758
hendrikvincent 0:05ccbd4f84f1 759 outlen = CHAP_HEADERLEN + msglen;
hendrikvincent 0:05ccbd4f84f1 760 outp = outpacket_buf[cstate->unit];
hendrikvincent 0:05ccbd4f84f1 761
hendrikvincent 0:05ccbd4f84f1 762 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
hendrikvincent 0:05ccbd4f84f1 763
hendrikvincent 0:05ccbd4f84f1 764 PUTCHAR(code, outp);
hendrikvincent 0:05ccbd4f84f1 765 PUTCHAR(cstate->chal_id, outp);
hendrikvincent 0:05ccbd4f84f1 766 PUTSHORT(outlen, outp);
hendrikvincent 0:05ccbd4f84f1 767 BCOPY(msg, outp, msglen);
hendrikvincent 0:05ccbd4f84f1 768 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
hendrikvincent 0:05ccbd4f84f1 769
hendrikvincent 0:05ccbd4f84f1 770 CHAPDEBUG(LOG_INFO, ("ChapSendStatus: Sent code %d, id %d.\n", code,
hendrikvincent 0:05ccbd4f84f1 771 cstate->chal_id));
hendrikvincent 0:05ccbd4f84f1 772 }
hendrikvincent 0:05ccbd4f84f1 773
hendrikvincent 0:05ccbd4f84f1 774 /*
hendrikvincent 0:05ccbd4f84f1 775 * ChapGenChallenge is used to generate a pseudo-random challenge string of
hendrikvincent 0:05ccbd4f84f1 776 * a pseudo-random length between min_len and max_len. The challenge
hendrikvincent 0:05ccbd4f84f1 777 * string and its length are stored in *cstate, and various other fields of
hendrikvincent 0:05ccbd4f84f1 778 * *cstate are initialized.
hendrikvincent 0:05ccbd4f84f1 779 */
hendrikvincent 0:05ccbd4f84f1 780
hendrikvincent 0:05ccbd4f84f1 781 static void
hendrikvincent 0:05ccbd4f84f1 782 ChapGenChallenge(chap_state *cstate)
hendrikvincent 0:05ccbd4f84f1 783 {
hendrikvincent 0:05ccbd4f84f1 784 int chal_len;
hendrikvincent 0:05ccbd4f84f1 785 u_char *ptr = cstate->challenge;
hendrikvincent 0:05ccbd4f84f1 786 int i;
hendrikvincent 0:05ccbd4f84f1 787
hendrikvincent 0:05ccbd4f84f1 788 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
hendrikvincent 0:05ccbd4f84f1 789 MAX_CHALLENGE_LENGTH */
hendrikvincent 0:05ccbd4f84f1 790 chal_len = (unsigned)
hendrikvincent 0:05ccbd4f84f1 791 ((((magic() >> 16) *
hendrikvincent 0:05ccbd4f84f1 792 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
hendrikvincent 0:05ccbd4f84f1 793 + MIN_CHALLENGE_LENGTH);
hendrikvincent 0:05ccbd4f84f1 794 LWIP_ASSERT("chal_len <= 0xff", chal_len <= 0xffff);
hendrikvincent 0:05ccbd4f84f1 795 cstate->chal_len = (u_char)chal_len;
hendrikvincent 0:05ccbd4f84f1 796 cstate->chal_id = ++cstate->id;
hendrikvincent 0:05ccbd4f84f1 797 cstate->chal_transmits = 0;
hendrikvincent 0:05ccbd4f84f1 798
hendrikvincent 0:05ccbd4f84f1 799 /* generate a random string */
hendrikvincent 0:05ccbd4f84f1 800 for (i = 0; i < chal_len; i++ ) {
hendrikvincent 0:05ccbd4f84f1 801 *ptr++ = (char) (magic() & 0xff);
hendrikvincent 0:05ccbd4f84f1 802 }
hendrikvincent 0:05ccbd4f84f1 803 }
hendrikvincent 0:05ccbd4f84f1 804
hendrikvincent 0:05ccbd4f84f1 805 /*
hendrikvincent 0:05ccbd4f84f1 806 * ChapSendResponse - send a response packet with values as specified
hendrikvincent 0:05ccbd4f84f1 807 * in *cstate.
hendrikvincent 0:05ccbd4f84f1 808 */
hendrikvincent 0:05ccbd4f84f1 809 /* ARGSUSED */
hendrikvincent 0:05ccbd4f84f1 810 static void
hendrikvincent 0:05ccbd4f84f1 811 ChapSendResponse(chap_state *cstate)
hendrikvincent 0:05ccbd4f84f1 812 {
hendrikvincent 0:05ccbd4f84f1 813 u_char *outp;
hendrikvincent 0:05ccbd4f84f1 814 int outlen, md_len, name_len;
hendrikvincent 0:05ccbd4f84f1 815
hendrikvincent 0:05ccbd4f84f1 816 md_len = cstate->resp_length;
hendrikvincent 0:05ccbd4f84f1 817 name_len = (int)strlen(cstate->resp_name);
hendrikvincent 0:05ccbd4f84f1 818 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
hendrikvincent 0:05ccbd4f84f1 819 outp = outpacket_buf[cstate->unit];
hendrikvincent 0:05ccbd4f84f1 820
hendrikvincent 0:05ccbd4f84f1 821 MAKEHEADER(outp, PPP_CHAP);
hendrikvincent 0:05ccbd4f84f1 822
hendrikvincent 0:05ccbd4f84f1 823 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
hendrikvincent 0:05ccbd4f84f1 824 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
hendrikvincent 0:05ccbd4f84f1 825 PUTSHORT(outlen, outp); /* packet length */
hendrikvincent 0:05ccbd4f84f1 826
hendrikvincent 0:05ccbd4f84f1 827 PUTCHAR(md_len, outp); /* length of MD */
hendrikvincent 0:05ccbd4f84f1 828 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
hendrikvincent 0:05ccbd4f84f1 829 INCPTR(md_len, outp);
hendrikvincent 0:05ccbd4f84f1 830
hendrikvincent 0:05ccbd4f84f1 831 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
hendrikvincent 0:05ccbd4f84f1 832
hendrikvincent 0:05ccbd4f84f1 833 /* send the packet */
hendrikvincent 0:05ccbd4f84f1 834 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
hendrikvincent 0:05ccbd4f84f1 835
hendrikvincent 0:05ccbd4f84f1 836 cstate->clientstate = CHAPCS_RESPONSE;
hendrikvincent 0:05ccbd4f84f1 837 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
hendrikvincent 0:05ccbd4f84f1 838 ++cstate->resp_transmits;
hendrikvincent 0:05ccbd4f84f1 839 }
hendrikvincent 0:05ccbd4f84f1 840
hendrikvincent 0:05ccbd4f84f1 841 #if PPP_ADDITIONAL_CALLBACKS
hendrikvincent 0:05ccbd4f84f1 842 static char *ChapCodenames[] = {
hendrikvincent 0:05ccbd4f84f1 843 "Challenge", "Response", "Success", "Failure"
hendrikvincent 0:05ccbd4f84f1 844 };
hendrikvincent 0:05ccbd4f84f1 845 /*
hendrikvincent 0:05ccbd4f84f1 846 * ChapPrintPkt - print the contents of a CHAP packet.
hendrikvincent 0:05ccbd4f84f1 847 */
hendrikvincent 0:05ccbd4f84f1 848 static int
hendrikvincent 0:05ccbd4f84f1 849 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
hendrikvincent 0:05ccbd4f84f1 850 {
hendrikvincent 0:05ccbd4f84f1 851 int code, id, len;
hendrikvincent 0:05ccbd4f84f1 852 int clen, nlen;
hendrikvincent 0:05ccbd4f84f1 853 u_char x;
hendrikvincent 0:05ccbd4f84f1 854
hendrikvincent 0:05ccbd4f84f1 855 if (plen < CHAP_HEADERLEN) {
hendrikvincent 0:05ccbd4f84f1 856 return 0;
hendrikvincent 0:05ccbd4f84f1 857 }
hendrikvincent 0:05ccbd4f84f1 858 GETCHAR(code, p);
hendrikvincent 0:05ccbd4f84f1 859 GETCHAR(id, p);
hendrikvincent 0:05ccbd4f84f1 860 GETSHORT(len, p);
hendrikvincent 0:05ccbd4f84f1 861 if (len < CHAP_HEADERLEN || len > plen) {
hendrikvincent 0:05ccbd4f84f1 862 return 0;
hendrikvincent 0:05ccbd4f84f1 863 }
hendrikvincent 0:05ccbd4f84f1 864
hendrikvincent 0:05ccbd4f84f1 865 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
hendrikvincent 0:05ccbd4f84f1 866 printer(arg, " %s", ChapCodenames[code-1]);
hendrikvincent 0:05ccbd4f84f1 867 } else {
hendrikvincent 0:05ccbd4f84f1 868 printer(arg, " code=0x%x", code);
hendrikvincent 0:05ccbd4f84f1 869 }
hendrikvincent 0:05ccbd4f84f1 870 printer(arg, " id=0x%x", id);
hendrikvincent 0:05ccbd4f84f1 871 len -= CHAP_HEADERLEN;
hendrikvincent 0:05ccbd4f84f1 872 switch (code) {
hendrikvincent 0:05ccbd4f84f1 873 case CHAP_CHALLENGE:
hendrikvincent 0:05ccbd4f84f1 874 case CHAP_RESPONSE:
hendrikvincent 0:05ccbd4f84f1 875 if (len < 1) {
hendrikvincent 0:05ccbd4f84f1 876 break;
hendrikvincent 0:05ccbd4f84f1 877 }
hendrikvincent 0:05ccbd4f84f1 878 clen = p[0];
hendrikvincent 0:05ccbd4f84f1 879 if (len < clen + 1) {
hendrikvincent 0:05ccbd4f84f1 880 break;
hendrikvincent 0:05ccbd4f84f1 881 }
hendrikvincent 0:05ccbd4f84f1 882 ++p;
hendrikvincent 0:05ccbd4f84f1 883 nlen = len - clen - 1;
hendrikvincent 0:05ccbd4f84f1 884 printer(arg, " <");
hendrikvincent 0:05ccbd4f84f1 885 for (; clen > 0; --clen) {
hendrikvincent 0:05ccbd4f84f1 886 GETCHAR(x, p);
hendrikvincent 0:05ccbd4f84f1 887 printer(arg, "%.2x", x);
hendrikvincent 0:05ccbd4f84f1 888 }
hendrikvincent 0:05ccbd4f84f1 889 printer(arg, ">, name = %.*Z", nlen, p);
hendrikvincent 0:05ccbd4f84f1 890 break;
hendrikvincent 0:05ccbd4f84f1 891 case CHAP_FAILURE:
hendrikvincent 0:05ccbd4f84f1 892 case CHAP_SUCCESS:
hendrikvincent 0:05ccbd4f84f1 893 printer(arg, " %.*Z", len, p);
hendrikvincent 0:05ccbd4f84f1 894 break;
hendrikvincent 0:05ccbd4f84f1 895 default:
hendrikvincent 0:05ccbd4f84f1 896 for (clen = len; clen > 0; --clen) {
hendrikvincent 0:05ccbd4f84f1 897 GETCHAR(x, p);
hendrikvincent 0:05ccbd4f84f1 898 printer(arg, " %.2x", x);
hendrikvincent 0:05ccbd4f84f1 899 }
hendrikvincent 0:05ccbd4f84f1 900 }
hendrikvincent 0:05ccbd4f84f1 901
hendrikvincent 0:05ccbd4f84f1 902 return len + CHAP_HEADERLEN;
hendrikvincent 0:05ccbd4f84f1 903 }
hendrikvincent 0:05ccbd4f84f1 904 #endif /* PPP_ADDITIONAL_CALLBACKS */
hendrikvincent 0:05ccbd4f84f1 905
hendrikvincent 0:05ccbd4f84f1 906 #endif /* CHAP_SUPPORT */
hendrikvincent 0:05ccbd4f84f1 907
hendrikvincent 0:05ccbd4f84f1 908 #endif /* PPP_SUPPORT */