Michael Kersh / Mbed 2 deprecated ECE4180EthernetTest

Ethernet test for ECE 4180 and others to find your IP address and do a simple HTTP GET request over port 80.

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/netif/ppp/chap.c@0:e7ca326e76ee, 2013-04-04 (annotated)

Committer:
mkersh3
Date:
Thu Apr 04 05:26:09 2013 +0000
Revision:
0:e7ca326e76ee
Ethernet Test for ECE4180 and others to find their IP Address and do a simple HTTP GET request over port 80.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mkersh3 0:e7ca326e76ee 1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
mkersh3 0:e7ca326e76ee 2 /*****************************************************************************
mkersh3 0:e7ca326e76ee 3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
mkersh3 0:e7ca326e76ee 4 *
mkersh3 0:e7ca326e76ee 5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
mkersh3 0:e7ca326e76ee 6 * portions Copyright (c) 1997 by Global Election Systems Inc.
mkersh3 0:e7ca326e76ee 7 *
mkersh3 0:e7ca326e76ee 8 * The authors hereby grant permission to use, copy, modify, distribute,
mkersh3 0:e7ca326e76ee 9 * and license this software and its documentation for any purpose, provided
mkersh3 0:e7ca326e76ee 10 * that existing copyright notices are retained in all copies and that this
mkersh3 0:e7ca326e76ee 11 * notice and the following disclaimer are included verbatim in any
mkersh3 0:e7ca326e76ee 12 * distributions. No written agreement, license, or royalty fee is required
mkersh3 0:e7ca326e76ee 13 * for any of the authorized uses.
mkersh3 0:e7ca326e76ee 14 *
mkersh3 0:e7ca326e76ee 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
mkersh3 0:e7ca326e76ee 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
mkersh3 0:e7ca326e76ee 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
mkersh3 0:e7ca326e76ee 18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mkersh3 0:e7ca326e76ee 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
mkersh3 0:e7ca326e76ee 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
mkersh3 0:e7ca326e76ee 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
mkersh3 0:e7ca326e76ee 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
mkersh3 0:e7ca326e76ee 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
mkersh3 0:e7ca326e76ee 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mkersh3 0:e7ca326e76ee 25 *
mkersh3 0:e7ca326e76ee 26 ******************************************************************************
mkersh3 0:e7ca326e76ee 27 * REVISION HISTORY
mkersh3 0:e7ca326e76ee 28 *
mkersh3 0:e7ca326e76ee 29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
mkersh3 0:e7ca326e76ee 30 * Ported to lwIP.
mkersh3 0:e7ca326e76ee 31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
mkersh3 0:e7ca326e76ee 32 * Original based on BSD chap.c.
mkersh3 0:e7ca326e76ee 33 *****************************************************************************/
mkersh3 0:e7ca326e76ee 34 /*
mkersh3 0:e7ca326e76ee 35 * chap.c - Challenge Handshake Authentication Protocol.
mkersh3 0:e7ca326e76ee 36 *
mkersh3 0:e7ca326e76ee 37 * Copyright (c) 1993 The Australian National University.
mkersh3 0:e7ca326e76ee 38 * All rights reserved.
mkersh3 0:e7ca326e76ee 39 *
mkersh3 0:e7ca326e76ee 40 * Redistribution and use in source and binary forms are permitted
mkersh3 0:e7ca326e76ee 41 * provided that the above copyright notice and this paragraph are
mkersh3 0:e7ca326e76ee 42 * duplicated in all such forms and that any documentation,
mkersh3 0:e7ca326e76ee 43 * advertising materials, and other materials related to such
mkersh3 0:e7ca326e76ee 44 * distribution and use acknowledge that the software was developed
mkersh3 0:e7ca326e76ee 45 * by the Australian National University. The name of the University
mkersh3 0:e7ca326e76ee 46 * may not be used to endorse or promote products derived from this
mkersh3 0:e7ca326e76ee 47 * software without specific prior written permission.
mkersh3 0:e7ca326e76ee 48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
mkersh3 0:e7ca326e76ee 49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
mkersh3 0:e7ca326e76ee 50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
mkersh3 0:e7ca326e76ee 51 *
mkersh3 0:e7ca326e76ee 52 * Copyright (c) 1991 Gregory M. Christy.
mkersh3 0:e7ca326e76ee 53 * All rights reserved.
mkersh3 0:e7ca326e76ee 54 *
mkersh3 0:e7ca326e76ee 55 * Redistribution and use in source and binary forms are permitted
mkersh3 0:e7ca326e76ee 56 * provided that the above copyright notice and this paragraph are
mkersh3 0:e7ca326e76ee 57 * duplicated in all such forms and that any documentation,
mkersh3 0:e7ca326e76ee 58 * advertising materials, and other materials related to such
mkersh3 0:e7ca326e76ee 59 * distribution and use acknowledge that the software was developed
mkersh3 0:e7ca326e76ee 60 * by Gregory M. Christy. The name of the author may not be used to
mkersh3 0:e7ca326e76ee 61 * endorse or promote products derived from this software without
mkersh3 0:e7ca326e76ee 62 * specific prior written permission.
mkersh3 0:e7ca326e76ee 63 *
mkersh3 0:e7ca326e76ee 64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
mkersh3 0:e7ca326e76ee 65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
mkersh3 0:e7ca326e76ee 66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
mkersh3 0:e7ca326e76ee 67 */
mkersh3 0:e7ca326e76ee 68
mkersh3 0:e7ca326e76ee 69 #include "lwip/opt.h"
mkersh3 0:e7ca326e76ee 70
mkersh3 0:e7ca326e76ee 71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
mkersh3 0:e7ca326e76ee 72
mkersh3 0:e7ca326e76ee 73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
mkersh3 0:e7ca326e76ee 74
mkersh3 0:e7ca326e76ee 75 #include "ppp.h"
mkersh3 0:e7ca326e76ee 76 #include "pppdebug.h"
mkersh3 0:e7ca326e76ee 77
mkersh3 0:e7ca326e76ee 78 #include "magic.h"
mkersh3 0:e7ca326e76ee 79 #include "randm.h"
mkersh3 0:e7ca326e76ee 80 #include "auth.h"
mkersh3 0:e7ca326e76ee 81 #include "md5.h"
mkersh3 0:e7ca326e76ee 82 #include "chap.h"
mkersh3 0:e7ca326e76ee 83 #include "chpms.h"
mkersh3 0:e7ca326e76ee 84
mkersh3 0:e7ca326e76ee 85 #include <string.h>
mkersh3 0:e7ca326e76ee 86
mkersh3 0:e7ca326e76ee 87 #if 0 /* UNUSED */
mkersh3 0:e7ca326e76ee 88 /*
mkersh3 0:e7ca326e76ee 89 * Command-line options.
mkersh3 0:e7ca326e76ee 90 */
mkersh3 0:e7ca326e76ee 91 static option_t chap_option_list[] = {
mkersh3 0:e7ca326e76ee 92 { "chap-restart", o_int, &chap[0].timeouttime,
mkersh3 0:e7ca326e76ee 93 "Set timeout for CHAP" },
mkersh3 0:e7ca326e76ee 94 { "chap-max-challenge", o_int, &chap[0].max_transmits,
mkersh3 0:e7ca326e76ee 95 "Set max #xmits for challenge" },
mkersh3 0:e7ca326e76ee 96 { "chap-interval", o_int, &chap[0].chal_interval,
mkersh3 0:e7ca326e76ee 97 "Set interval for rechallenge" },
mkersh3 0:e7ca326e76ee 98 #ifdef MSLANMAN
mkersh3 0:e7ca326e76ee 99 { "ms-lanman", o_bool, &ms_lanman,
mkersh3 0:e7ca326e76ee 100 "Use LanMan passwd when using MS-CHAP", 1 },
mkersh3 0:e7ca326e76ee 101 #endif
mkersh3 0:e7ca326e76ee 102 { NULL }
mkersh3 0:e7ca326e76ee 103 };
mkersh3 0:e7ca326e76ee 104 #endif /* UNUSED */
mkersh3 0:e7ca326e76ee 105
mkersh3 0:e7ca326e76ee 106 /*
mkersh3 0:e7ca326e76ee 107 * Protocol entry points.
mkersh3 0:e7ca326e76ee 108 */
mkersh3 0:e7ca326e76ee 109 static void ChapInit (int);
mkersh3 0:e7ca326e76ee 110 static void ChapLowerUp (int);
mkersh3 0:e7ca326e76ee 111 static void ChapLowerDown (int);
mkersh3 0:e7ca326e76ee 112 static void ChapInput (int, u_char *, int);
mkersh3 0:e7ca326e76ee 113 static void ChapProtocolReject (int);
mkersh3 0:e7ca326e76ee 114 #if PPP_ADDITIONAL_CALLBACKS
mkersh3 0:e7ca326e76ee 115 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
mkersh3 0:e7ca326e76ee 116 #endif
mkersh3 0:e7ca326e76ee 117
mkersh3 0:e7ca326e76ee 118 struct protent chap_protent = {
mkersh3 0:e7ca326e76ee 119 PPP_CHAP,
mkersh3 0:e7ca326e76ee 120 ChapInit,
mkersh3 0:e7ca326e76ee 121 ChapInput,
mkersh3 0:e7ca326e76ee 122 ChapProtocolReject,
mkersh3 0:e7ca326e76ee 123 ChapLowerUp,
mkersh3 0:e7ca326e76ee 124 ChapLowerDown,
mkersh3 0:e7ca326e76ee 125 NULL,
mkersh3 0:e7ca326e76ee 126 NULL,
mkersh3 0:e7ca326e76ee 127 #if PPP_ADDITIONAL_CALLBACKS
mkersh3 0:e7ca326e76ee 128 ChapPrintPkt,
mkersh3 0:e7ca326e76ee 129 NULL,
mkersh3 0:e7ca326e76ee 130 #endif /* PPP_ADDITIONAL_CALLBACKS */
mkersh3 0:e7ca326e76ee 131 1,
mkersh3 0:e7ca326e76ee 132 "CHAP",
mkersh3 0:e7ca326e76ee 133 #if PPP_ADDITIONAL_CALLBACKS
mkersh3 0:e7ca326e76ee 134 NULL,
mkersh3 0:e7ca326e76ee 135 NULL,
mkersh3 0:e7ca326e76ee 136 NULL
mkersh3 0:e7ca326e76ee 137 #endif /* PPP_ADDITIONAL_CALLBACKS */
mkersh3 0:e7ca326e76ee 138 };
mkersh3 0:e7ca326e76ee 139
mkersh3 0:e7ca326e76ee 140 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
mkersh3 0:e7ca326e76ee 141
mkersh3 0:e7ca326e76ee 142 static void ChapChallengeTimeout (void *);
mkersh3 0:e7ca326e76ee 143 static void ChapResponseTimeout (void *);
mkersh3 0:e7ca326e76ee 144 static void ChapReceiveChallenge (chap_state *, u_char *, u_char, int);
mkersh3 0:e7ca326e76ee 145 static void ChapRechallenge (void *);
mkersh3 0:e7ca326e76ee 146 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
mkersh3 0:e7ca326e76ee 147 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
mkersh3 0:e7ca326e76ee 148 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
mkersh3 0:e7ca326e76ee 149 static void ChapSendStatus (chap_state *, int);
mkersh3 0:e7ca326e76ee 150 static void ChapSendChallenge (chap_state *);
mkersh3 0:e7ca326e76ee 151 static void ChapSendResponse (chap_state *);
mkersh3 0:e7ca326e76ee 152 static void ChapGenChallenge (chap_state *);
mkersh3 0:e7ca326e76ee 153
mkersh3 0:e7ca326e76ee 154 /*
mkersh3 0:e7ca326e76ee 155 * ChapInit - Initialize a CHAP unit.
mkersh3 0:e7ca326e76ee 156 */
mkersh3 0:e7ca326e76ee 157 static void
mkersh3 0:e7ca326e76ee 158 ChapInit(int unit)
mkersh3 0:e7ca326e76ee 159 {
mkersh3 0:e7ca326e76ee 160 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 161
mkersh3 0:e7ca326e76ee 162 BZERO(cstate, sizeof(*cstate));
mkersh3 0:e7ca326e76ee 163 cstate->unit = unit;
mkersh3 0:e7ca326e76ee 164 cstate->clientstate = CHAPCS_INITIAL;
mkersh3 0:e7ca326e76ee 165 cstate->serverstate = CHAPSS_INITIAL;
mkersh3 0:e7ca326e76ee 166 cstate->timeouttime = CHAP_DEFTIMEOUT;
mkersh3 0:e7ca326e76ee 167 cstate->max_transmits = CHAP_DEFTRANSMITS;
mkersh3 0:e7ca326e76ee 168 /* random number generator is initialized in magic_init */
mkersh3 0:e7ca326e76ee 169 }
mkersh3 0:e7ca326e76ee 170
mkersh3 0:e7ca326e76ee 171
mkersh3 0:e7ca326e76ee 172 /*
mkersh3 0:e7ca326e76ee 173 * ChapAuthWithPeer - Authenticate us with our peer (start client).
mkersh3 0:e7ca326e76ee 174 *
mkersh3 0:e7ca326e76ee 175 */
mkersh3 0:e7ca326e76ee 176 void
mkersh3 0:e7ca326e76ee 177 ChapAuthWithPeer(int unit, char *our_name, u_char digest)
mkersh3 0:e7ca326e76ee 178 {
mkersh3 0:e7ca326e76ee 179 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 180
mkersh3 0:e7ca326e76ee 181 cstate->resp_name = our_name;
mkersh3 0:e7ca326e76ee 182 cstate->resp_type = digest;
mkersh3 0:e7ca326e76ee 183
mkersh3 0:e7ca326e76ee 184 if (cstate->clientstate == CHAPCS_INITIAL ||
mkersh3 0:e7ca326e76ee 185 cstate->clientstate == CHAPCS_PENDING) {
mkersh3 0:e7ca326e76ee 186 /* lower layer isn't up - wait until later */
mkersh3 0:e7ca326e76ee 187 cstate->clientstate = CHAPCS_PENDING;
mkersh3 0:e7ca326e76ee 188 return;
mkersh3 0:e7ca326e76ee 189 }
mkersh3 0:e7ca326e76ee 190
mkersh3 0:e7ca326e76ee 191 /*
mkersh3 0:e7ca326e76ee 192 * We get here as a result of LCP coming up.
mkersh3 0:e7ca326e76ee 193 * So even if CHAP was open before, we will
mkersh3 0:e7ca326e76ee 194 * have to re-authenticate ourselves.
mkersh3 0:e7ca326e76ee 195 */
mkersh3 0:e7ca326e76ee 196 cstate->clientstate = CHAPCS_LISTEN;
mkersh3 0:e7ca326e76ee 197 }
mkersh3 0:e7ca326e76ee 198
mkersh3 0:e7ca326e76ee 199
mkersh3 0:e7ca326e76ee 200 /*
mkersh3 0:e7ca326e76ee 201 * ChapAuthPeer - Authenticate our peer (start server).
mkersh3 0:e7ca326e76ee 202 */
mkersh3 0:e7ca326e76ee 203 void
mkersh3 0:e7ca326e76ee 204 ChapAuthPeer(int unit, char *our_name, u_char digest)
mkersh3 0:e7ca326e76ee 205 {
mkersh3 0:e7ca326e76ee 206 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 207
mkersh3 0:e7ca326e76ee 208 cstate->chal_name = our_name;
mkersh3 0:e7ca326e76ee 209 cstate->chal_type = digest;
mkersh3 0:e7ca326e76ee 210
mkersh3 0:e7ca326e76ee 211 if (cstate->serverstate == CHAPSS_INITIAL ||
mkersh3 0:e7ca326e76ee 212 cstate->serverstate == CHAPSS_PENDING) {
mkersh3 0:e7ca326e76ee 213 /* lower layer isn't up - wait until later */
mkersh3 0:e7ca326e76ee 214 cstate->serverstate = CHAPSS_PENDING;
mkersh3 0:e7ca326e76ee 215 return;
mkersh3 0:e7ca326e76ee 216 }
mkersh3 0:e7ca326e76ee 217
mkersh3 0:e7ca326e76ee 218 ChapGenChallenge(cstate);
mkersh3 0:e7ca326e76ee 219 ChapSendChallenge(cstate); /* crank it up dude! */
mkersh3 0:e7ca326e76ee 220 cstate->serverstate = CHAPSS_INITIAL_CHAL;
mkersh3 0:e7ca326e76ee 221 }
mkersh3 0:e7ca326e76ee 222
mkersh3 0:e7ca326e76ee 223
mkersh3 0:e7ca326e76ee 224 /*
mkersh3 0:e7ca326e76ee 225 * ChapChallengeTimeout - Timeout expired on sending challenge.
mkersh3 0:e7ca326e76ee 226 */
mkersh3 0:e7ca326e76ee 227 static void
mkersh3 0:e7ca326e76ee 228 ChapChallengeTimeout(void *arg)
mkersh3 0:e7ca326e76ee 229 {
mkersh3 0:e7ca326e76ee 230 chap_state *cstate = (chap_state *) arg;
mkersh3 0:e7ca326e76ee 231
mkersh3 0:e7ca326e76ee 232 /* if we aren't sending challenges, don't worry. then again we */
mkersh3 0:e7ca326e76ee 233 /* probably shouldn't be here either */
mkersh3 0:e7ca326e76ee 234 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
mkersh3 0:e7ca326e76ee 235 cstate->serverstate != CHAPSS_RECHALLENGE) {
mkersh3 0:e7ca326e76ee 236 return;
mkersh3 0:e7ca326e76ee 237 }
mkersh3 0:e7ca326e76ee 238
mkersh3 0:e7ca326e76ee 239 if (cstate->chal_transmits >= cstate->max_transmits) {
mkersh3 0:e7ca326e76ee 240 /* give up on peer */
mkersh3 0:e7ca326e76ee 241 CHAPDEBUG(LOG_ERR, ("Peer failed to respond to CHAP challenge\n"));
mkersh3 0:e7ca326e76ee 242 cstate->serverstate = CHAPSS_BADAUTH;
mkersh3 0:e7ca326e76ee 243 auth_peer_fail(cstate->unit, PPP_CHAP);
mkersh3 0:e7ca326e76ee 244 return;
mkersh3 0:e7ca326e76ee 245 }
mkersh3 0:e7ca326e76ee 246
mkersh3 0:e7ca326e76ee 247 ChapSendChallenge(cstate); /* Re-send challenge */
mkersh3 0:e7ca326e76ee 248 }
mkersh3 0:e7ca326e76ee 249
mkersh3 0:e7ca326e76ee 250
mkersh3 0:e7ca326e76ee 251 /*
mkersh3 0:e7ca326e76ee 252 * ChapResponseTimeout - Timeout expired on sending response.
mkersh3 0:e7ca326e76ee 253 */
mkersh3 0:e7ca326e76ee 254 static void
mkersh3 0:e7ca326e76ee 255 ChapResponseTimeout(void *arg)
mkersh3 0:e7ca326e76ee 256 {
mkersh3 0:e7ca326e76ee 257 chap_state *cstate = (chap_state *) arg;
mkersh3 0:e7ca326e76ee 258
mkersh3 0:e7ca326e76ee 259 /* if we aren't sending a response, don't worry. */
mkersh3 0:e7ca326e76ee 260 if (cstate->clientstate != CHAPCS_RESPONSE) {
mkersh3 0:e7ca326e76ee 261 return;
mkersh3 0:e7ca326e76ee 262 }
mkersh3 0:e7ca326e76ee 263
mkersh3 0:e7ca326e76ee 264 ChapSendResponse(cstate); /* re-send response */
mkersh3 0:e7ca326e76ee 265 }
mkersh3 0:e7ca326e76ee 266
mkersh3 0:e7ca326e76ee 267
mkersh3 0:e7ca326e76ee 268 /*
mkersh3 0:e7ca326e76ee 269 * ChapRechallenge - Time to challenge the peer again.
mkersh3 0:e7ca326e76ee 270 */
mkersh3 0:e7ca326e76ee 271 static void
mkersh3 0:e7ca326e76ee 272 ChapRechallenge(void *arg)
mkersh3 0:e7ca326e76ee 273 {
mkersh3 0:e7ca326e76ee 274 chap_state *cstate = (chap_state *) arg;
mkersh3 0:e7ca326e76ee 275
mkersh3 0:e7ca326e76ee 276 /* if we aren't sending a response, don't worry. */
mkersh3 0:e7ca326e76ee 277 if (cstate->serverstate != CHAPSS_OPEN) {
mkersh3 0:e7ca326e76ee 278 return;
mkersh3 0:e7ca326e76ee 279 }
mkersh3 0:e7ca326e76ee 280
mkersh3 0:e7ca326e76ee 281 ChapGenChallenge(cstate);
mkersh3 0:e7ca326e76ee 282 ChapSendChallenge(cstate);
mkersh3 0:e7ca326e76ee 283 cstate->serverstate = CHAPSS_RECHALLENGE;
mkersh3 0:e7ca326e76ee 284 }
mkersh3 0:e7ca326e76ee 285
mkersh3 0:e7ca326e76ee 286
mkersh3 0:e7ca326e76ee 287 /*
mkersh3 0:e7ca326e76ee 288 * ChapLowerUp - The lower layer is up.
mkersh3 0:e7ca326e76ee 289 *
mkersh3 0:e7ca326e76ee 290 * Start up if we have pending requests.
mkersh3 0:e7ca326e76ee 291 */
mkersh3 0:e7ca326e76ee 292 static void
mkersh3 0:e7ca326e76ee 293 ChapLowerUp(int unit)
mkersh3 0:e7ca326e76ee 294 {
mkersh3 0:e7ca326e76ee 295 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 296
mkersh3 0:e7ca326e76ee 297 if (cstate->clientstate == CHAPCS_INITIAL) {
mkersh3 0:e7ca326e76ee 298 cstate->clientstate = CHAPCS_CLOSED;
mkersh3 0:e7ca326e76ee 299 } else if (cstate->clientstate == CHAPCS_PENDING) {
mkersh3 0:e7ca326e76ee 300 cstate->clientstate = CHAPCS_LISTEN;
mkersh3 0:e7ca326e76ee 301 }
mkersh3 0:e7ca326e76ee 302
mkersh3 0:e7ca326e76ee 303 if (cstate->serverstate == CHAPSS_INITIAL) {
mkersh3 0:e7ca326e76ee 304 cstate->serverstate = CHAPSS_CLOSED;
mkersh3 0:e7ca326e76ee 305 } else if (cstate->serverstate == CHAPSS_PENDING) {
mkersh3 0:e7ca326e76ee 306 ChapGenChallenge(cstate);
mkersh3 0:e7ca326e76ee 307 ChapSendChallenge(cstate);
mkersh3 0:e7ca326e76ee 308 cstate->serverstate = CHAPSS_INITIAL_CHAL;
mkersh3 0:e7ca326e76ee 309 }
mkersh3 0:e7ca326e76ee 310 }
mkersh3 0:e7ca326e76ee 311
mkersh3 0:e7ca326e76ee 312
mkersh3 0:e7ca326e76ee 313 /*
mkersh3 0:e7ca326e76ee 314 * ChapLowerDown - The lower layer is down.
mkersh3 0:e7ca326e76ee 315 *
mkersh3 0:e7ca326e76ee 316 * Cancel all timeouts.
mkersh3 0:e7ca326e76ee 317 */
mkersh3 0:e7ca326e76ee 318 static void
mkersh3 0:e7ca326e76ee 319 ChapLowerDown(int unit)
mkersh3 0:e7ca326e76ee 320 {
mkersh3 0:e7ca326e76ee 321 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 322
mkersh3 0:e7ca326e76ee 323 /* Timeout(s) pending? Cancel if so. */
mkersh3 0:e7ca326e76ee 324 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
mkersh3 0:e7ca326e76ee 325 cstate->serverstate == CHAPSS_RECHALLENGE) {
mkersh3 0:e7ca326e76ee 326 UNTIMEOUT(ChapChallengeTimeout, cstate);
mkersh3 0:e7ca326e76ee 327 } else if (cstate->serverstate == CHAPSS_OPEN
mkersh3 0:e7ca326e76ee 328 && cstate->chal_interval != 0) {
mkersh3 0:e7ca326e76ee 329 UNTIMEOUT(ChapRechallenge, cstate);
mkersh3 0:e7ca326e76ee 330 }
mkersh3 0:e7ca326e76ee 331 if (cstate->clientstate == CHAPCS_RESPONSE) {
mkersh3 0:e7ca326e76ee 332 UNTIMEOUT(ChapResponseTimeout, cstate);
mkersh3 0:e7ca326e76ee 333 }
mkersh3 0:e7ca326e76ee 334 cstate->clientstate = CHAPCS_INITIAL;
mkersh3 0:e7ca326e76ee 335 cstate->serverstate = CHAPSS_INITIAL;
mkersh3 0:e7ca326e76ee 336 }
mkersh3 0:e7ca326e76ee 337
mkersh3 0:e7ca326e76ee 338
mkersh3 0:e7ca326e76ee 339 /*
mkersh3 0:e7ca326e76ee 340 * ChapProtocolReject - Peer doesn't grok CHAP.
mkersh3 0:e7ca326e76ee 341 */
mkersh3 0:e7ca326e76ee 342 static void
mkersh3 0:e7ca326e76ee 343 ChapProtocolReject(int unit)
mkersh3 0:e7ca326e76ee 344 {
mkersh3 0:e7ca326e76ee 345 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 346
mkersh3 0:e7ca326e76ee 347 if (cstate->serverstate != CHAPSS_INITIAL &&
mkersh3 0:e7ca326e76ee 348 cstate->serverstate != CHAPSS_CLOSED) {
mkersh3 0:e7ca326e76ee 349 auth_peer_fail(unit, PPP_CHAP);
mkersh3 0:e7ca326e76ee 350 }
mkersh3 0:e7ca326e76ee 351 if (cstate->clientstate != CHAPCS_INITIAL &&
mkersh3 0:e7ca326e76ee 352 cstate->clientstate != CHAPCS_CLOSED) {
mkersh3 0:e7ca326e76ee 353 auth_withpeer_fail(unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
mkersh3 0:e7ca326e76ee 354 }
mkersh3 0:e7ca326e76ee 355 ChapLowerDown(unit); /* shutdown chap */
mkersh3 0:e7ca326e76ee 356 }
mkersh3 0:e7ca326e76ee 357
mkersh3 0:e7ca326e76ee 358
mkersh3 0:e7ca326e76ee 359 /*
mkersh3 0:e7ca326e76ee 360 * ChapInput - Input CHAP packet.
mkersh3 0:e7ca326e76ee 361 */
mkersh3 0:e7ca326e76ee 362 static void
mkersh3 0:e7ca326e76ee 363 ChapInput(int unit, u_char *inpacket, int packet_len)
mkersh3 0:e7ca326e76ee 364 {
mkersh3 0:e7ca326e76ee 365 chap_state *cstate = &chap[unit];
mkersh3 0:e7ca326e76ee 366 u_char *inp;
mkersh3 0:e7ca326e76ee 367 u_char code, id;
mkersh3 0:e7ca326e76ee 368 int len;
mkersh3 0:e7ca326e76ee 369
mkersh3 0:e7ca326e76ee 370 /*
mkersh3 0:e7ca326e76ee 371 * Parse header (code, id and length).
mkersh3 0:e7ca326e76ee 372 * If packet too short, drop it.
mkersh3 0:e7ca326e76ee 373 */
mkersh3 0:e7ca326e76ee 374 inp = inpacket;
mkersh3 0:e7ca326e76ee 375 if (packet_len < CHAP_HEADERLEN) {
mkersh3 0:e7ca326e76ee 376 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short header.\n"));
mkersh3 0:e7ca326e76ee 377 return;
mkersh3 0:e7ca326e76ee 378 }
mkersh3 0:e7ca326e76ee 379 GETCHAR(code, inp);
mkersh3 0:e7ca326e76ee 380 GETCHAR(id, inp);
mkersh3 0:e7ca326e76ee 381 GETSHORT(len, inp);
mkersh3 0:e7ca326e76ee 382 if (len < CHAP_HEADERLEN) {
mkersh3 0:e7ca326e76ee 383 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd illegal length.\n"));
mkersh3 0:e7ca326e76ee 384 return;
mkersh3 0:e7ca326e76ee 385 }
mkersh3 0:e7ca326e76ee 386 if (len > packet_len) {
mkersh3 0:e7ca326e76ee 387 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short packet.\n"));
mkersh3 0:e7ca326e76ee 388 return;
mkersh3 0:e7ca326e76ee 389 }
mkersh3 0:e7ca326e76ee 390 len -= CHAP_HEADERLEN;
mkersh3 0:e7ca326e76ee 391
mkersh3 0:e7ca326e76ee 392 /*
mkersh3 0:e7ca326e76ee 393 * Action depends on code (as in fact it usually does :-).
mkersh3 0:e7ca326e76ee 394 */
mkersh3 0:e7ca326e76ee 395 switch (code) {
mkersh3 0:e7ca326e76ee 396 case CHAP_CHALLENGE:
mkersh3 0:e7ca326e76ee 397 ChapReceiveChallenge(cstate, inp, id, len);
mkersh3 0:e7ca326e76ee 398 break;
mkersh3 0:e7ca326e76ee 399
mkersh3 0:e7ca326e76ee 400 case CHAP_RESPONSE:
mkersh3 0:e7ca326e76ee 401 ChapReceiveResponse(cstate, inp, id, len);
mkersh3 0:e7ca326e76ee 402 break;
mkersh3 0:e7ca326e76ee 403
mkersh3 0:e7ca326e76ee 404 case CHAP_FAILURE:
mkersh3 0:e7ca326e76ee 405 ChapReceiveFailure(cstate, inp, id, len);
mkersh3 0:e7ca326e76ee 406 break;
mkersh3 0:e7ca326e76ee 407
mkersh3 0:e7ca326e76ee 408 case CHAP_SUCCESS:
mkersh3 0:e7ca326e76ee 409 ChapReceiveSuccess(cstate, inp, id, len);
mkersh3 0:e7ca326e76ee 410 break;
mkersh3 0:e7ca326e76ee 411
mkersh3 0:e7ca326e76ee 412 default: /* Need code reject? */
mkersh3 0:e7ca326e76ee 413 CHAPDEBUG(LOG_WARNING, ("Unknown CHAP code (%d) received.\n", code));
mkersh3 0:e7ca326e76ee 414 break;
mkersh3 0:e7ca326e76ee 415 }
mkersh3 0:e7ca326e76ee 416 }
mkersh3 0:e7ca326e76ee 417
mkersh3 0:e7ca326e76ee 418
mkersh3 0:e7ca326e76ee 419 /*
mkersh3 0:e7ca326e76ee 420 * ChapReceiveChallenge - Receive Challenge and send Response.
mkersh3 0:e7ca326e76ee 421 */
mkersh3 0:e7ca326e76ee 422 static void
mkersh3 0:e7ca326e76ee 423 ChapReceiveChallenge(chap_state *cstate, u_char *inp, u_char id, int len)
mkersh3 0:e7ca326e76ee 424 {
mkersh3 0:e7ca326e76ee 425 int rchallenge_len;
mkersh3 0:e7ca326e76ee 426 u_char *rchallenge;
mkersh3 0:e7ca326e76ee 427 int secret_len;
mkersh3 0:e7ca326e76ee 428 char secret[MAXSECRETLEN];
mkersh3 0:e7ca326e76ee 429 char rhostname[256];
mkersh3 0:e7ca326e76ee 430 MD5_CTX mdContext;
mkersh3 0:e7ca326e76ee 431 u_char hash[MD5_SIGNATURE_SIZE];
mkersh3 0:e7ca326e76ee 432
mkersh3 0:e7ca326e76ee 433 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: Rcvd id %d.\n", id));
mkersh3 0:e7ca326e76ee 434 if (cstate->clientstate == CHAPCS_CLOSED ||
mkersh3 0:e7ca326e76ee 435 cstate->clientstate == CHAPCS_PENDING) {
mkersh3 0:e7ca326e76ee 436 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: in state %d\n",
mkersh3 0:e7ca326e76ee 437 cstate->clientstate));
mkersh3 0:e7ca326e76ee 438 return;
mkersh3 0:e7ca326e76ee 439 }
mkersh3 0:e7ca326e76ee 440
mkersh3 0:e7ca326e76ee 441 if (len < 2) {
mkersh3 0:e7ca326e76ee 442 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
mkersh3 0:e7ca326e76ee 443 return;
mkersh3 0:e7ca326e76ee 444 }
mkersh3 0:e7ca326e76ee 445
mkersh3 0:e7ca326e76ee 446 GETCHAR(rchallenge_len, inp);
mkersh3 0:e7ca326e76ee 447 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
mkersh3 0:e7ca326e76ee 448 if (len < 0) {
mkersh3 0:e7ca326e76ee 449 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
mkersh3 0:e7ca326e76ee 450 return;
mkersh3 0:e7ca326e76ee 451 }
mkersh3 0:e7ca326e76ee 452 rchallenge = inp;
mkersh3 0:e7ca326e76ee 453 INCPTR(rchallenge_len, inp);
mkersh3 0:e7ca326e76ee 454
mkersh3 0:e7ca326e76ee 455 if (len >= (int)sizeof(rhostname)) {
mkersh3 0:e7ca326e76ee 456 len = sizeof(rhostname) - 1;
mkersh3 0:e7ca326e76ee 457 }
mkersh3 0:e7ca326e76ee 458 BCOPY(inp, rhostname, len);
mkersh3 0:e7ca326e76ee 459 rhostname[len] = '\000';
mkersh3 0:e7ca326e76ee 460
mkersh3 0:e7ca326e76ee 461 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: received name field '%s'\n",
mkersh3 0:e7ca326e76ee 462 rhostname));
mkersh3 0:e7ca326e76ee 463
mkersh3 0:e7ca326e76ee 464 /* Microsoft doesn't send their name back in the PPP packet */
mkersh3 0:e7ca326e76ee 465 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
mkersh3 0:e7ca326e76ee 466 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
mkersh3 0:e7ca326e76ee 467 rhostname[sizeof(rhostname) - 1] = 0;
mkersh3 0:e7ca326e76ee 468 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: using '%s' as remote name\n",
mkersh3 0:e7ca326e76ee 469 rhostname));
mkersh3 0:e7ca326e76ee 470 }
mkersh3 0:e7ca326e76ee 471
mkersh3 0:e7ca326e76ee 472 /* get secret for authenticating ourselves with the specified host */
mkersh3 0:e7ca326e76ee 473 if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
mkersh3 0:e7ca326e76ee 474 secret, &secret_len, 0)) {
mkersh3 0:e7ca326e76ee 475 secret_len = 0; /* assume null secret if can't find one */
mkersh3 0:e7ca326e76ee 476 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating us to %s\n",
mkersh3 0:e7ca326e76ee 477 rhostname));
mkersh3 0:e7ca326e76ee 478 }
mkersh3 0:e7ca326e76ee 479
mkersh3 0:e7ca326e76ee 480 /* cancel response send timeout if necessary */
mkersh3 0:e7ca326e76ee 481 if (cstate->clientstate == CHAPCS_RESPONSE) {
mkersh3 0:e7ca326e76ee 482 UNTIMEOUT(ChapResponseTimeout, cstate);
mkersh3 0:e7ca326e76ee 483 }
mkersh3 0:e7ca326e76ee 484
mkersh3 0:e7ca326e76ee 485 cstate->resp_id = id;
mkersh3 0:e7ca326e76ee 486 cstate->resp_transmits = 0;
mkersh3 0:e7ca326e76ee 487
mkersh3 0:e7ca326e76ee 488 /* generate MD based on negotiated type */
mkersh3 0:e7ca326e76ee 489 switch (cstate->resp_type) {
mkersh3 0:e7ca326e76ee 490
mkersh3 0:e7ca326e76ee 491 case CHAP_DIGEST_MD5:
mkersh3 0:e7ca326e76ee 492 MD5Init(&mdContext);
mkersh3 0:e7ca326e76ee 493 MD5Update(&mdContext, &cstate->resp_id, 1);
mkersh3 0:e7ca326e76ee 494 MD5Update(&mdContext, (u_char*)secret, secret_len);
mkersh3 0:e7ca326e76ee 495 MD5Update(&mdContext, rchallenge, rchallenge_len);
mkersh3 0:e7ca326e76ee 496 MD5Final(hash, &mdContext);
mkersh3 0:e7ca326e76ee 497 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
mkersh3 0:e7ca326e76ee 498 cstate->resp_length = MD5_SIGNATURE_SIZE;
mkersh3 0:e7ca326e76ee 499 break;
mkersh3 0:e7ca326e76ee 500
mkersh3 0:e7ca326e76ee 501 #if MSCHAP_SUPPORT
mkersh3 0:e7ca326e76ee 502 case CHAP_MICROSOFT:
mkersh3 0:e7ca326e76ee 503 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
mkersh3 0:e7ca326e76ee 504 break;
mkersh3 0:e7ca326e76ee 505 #endif
mkersh3 0:e7ca326e76ee 506
mkersh3 0:e7ca326e76ee 507 default:
mkersh3 0:e7ca326e76ee 508 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->resp_type));
mkersh3 0:e7ca326e76ee 509 return;
mkersh3 0:e7ca326e76ee 510 }
mkersh3 0:e7ca326e76ee 511
mkersh3 0:e7ca326e76ee 512 BZERO(secret, sizeof(secret));
mkersh3 0:e7ca326e76ee 513 ChapSendResponse(cstate);
mkersh3 0:e7ca326e76ee 514 }
mkersh3 0:e7ca326e76ee 515
mkersh3 0:e7ca326e76ee 516
mkersh3 0:e7ca326e76ee 517 /*
mkersh3 0:e7ca326e76ee 518 * ChapReceiveResponse - Receive and process response.
mkersh3 0:e7ca326e76ee 519 */
mkersh3 0:e7ca326e76ee 520 static void
mkersh3 0:e7ca326e76ee 521 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
mkersh3 0:e7ca326e76ee 522 {
mkersh3 0:e7ca326e76ee 523 u_char *remmd, remmd_len;
mkersh3 0:e7ca326e76ee 524 int secret_len, old_state;
mkersh3 0:e7ca326e76ee 525 int code;
mkersh3 0:e7ca326e76ee 526 char rhostname[256];
mkersh3 0:e7ca326e76ee 527 MD5_CTX mdContext;
mkersh3 0:e7ca326e76ee 528 char secret[MAXSECRETLEN];
mkersh3 0:e7ca326e76ee 529 u_char hash[MD5_SIGNATURE_SIZE];
mkersh3 0:e7ca326e76ee 530
mkersh3 0:e7ca326e76ee 531 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: Rcvd id %d.\n", id));
mkersh3 0:e7ca326e76ee 532
mkersh3 0:e7ca326e76ee 533 if (cstate->serverstate == CHAPSS_CLOSED ||
mkersh3 0:e7ca326e76ee 534 cstate->serverstate == CHAPSS_PENDING) {
mkersh3 0:e7ca326e76ee 535 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: in state %d\n",
mkersh3 0:e7ca326e76ee 536 cstate->serverstate));
mkersh3 0:e7ca326e76ee 537 return;
mkersh3 0:e7ca326e76ee 538 }
mkersh3 0:e7ca326e76ee 539
mkersh3 0:e7ca326e76ee 540 if (id != cstate->chal_id) {
mkersh3 0:e7ca326e76ee 541 return; /* doesn't match ID of last challenge */
mkersh3 0:e7ca326e76ee 542 }
mkersh3 0:e7ca326e76ee 543
mkersh3 0:e7ca326e76ee 544 /*
mkersh3 0:e7ca326e76ee 545 * If we have received a duplicate or bogus Response,
mkersh3 0:e7ca326e76ee 546 * we have to send the same answer (Success/Failure)
mkersh3 0:e7ca326e76ee 547 * as we did for the first Response we saw.
mkersh3 0:e7ca326e76ee 548 */
mkersh3 0:e7ca326e76ee 549 if (cstate->serverstate == CHAPSS_OPEN) {
mkersh3 0:e7ca326e76ee 550 ChapSendStatus(cstate, CHAP_SUCCESS);
mkersh3 0:e7ca326e76ee 551 return;
mkersh3 0:e7ca326e76ee 552 }
mkersh3 0:e7ca326e76ee 553 if (cstate->serverstate == CHAPSS_BADAUTH) {
mkersh3 0:e7ca326e76ee 554 ChapSendStatus(cstate, CHAP_FAILURE);
mkersh3 0:e7ca326e76ee 555 return;
mkersh3 0:e7ca326e76ee 556 }
mkersh3 0:e7ca326e76ee 557
mkersh3 0:e7ca326e76ee 558 if (len < 2) {
mkersh3 0:e7ca326e76ee 559 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
mkersh3 0:e7ca326e76ee 560 return;
mkersh3 0:e7ca326e76ee 561 }
mkersh3 0:e7ca326e76ee 562 GETCHAR(remmd_len, inp); /* get length of MD */
mkersh3 0:e7ca326e76ee 563 remmd = inp; /* get pointer to MD */
mkersh3 0:e7ca326e76ee 564 INCPTR(remmd_len, inp);
mkersh3 0:e7ca326e76ee 565
mkersh3 0:e7ca326e76ee 566 len -= sizeof (u_char) + remmd_len;
mkersh3 0:e7ca326e76ee 567 if (len < 0) {
mkersh3 0:e7ca326e76ee 568 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
mkersh3 0:e7ca326e76ee 569 return;
mkersh3 0:e7ca326e76ee 570 }
mkersh3 0:e7ca326e76ee 571
mkersh3 0:e7ca326e76ee 572 UNTIMEOUT(ChapChallengeTimeout, cstate);
mkersh3 0:e7ca326e76ee 573
mkersh3 0:e7ca326e76ee 574 if (len >= (int)sizeof(rhostname)) {
mkersh3 0:e7ca326e76ee 575 len = sizeof(rhostname) - 1;
mkersh3 0:e7ca326e76ee 576 }
mkersh3 0:e7ca326e76ee 577 BCOPY(inp, rhostname, len);
mkersh3 0:e7ca326e76ee 578 rhostname[len] = '\000';
mkersh3 0:e7ca326e76ee 579
mkersh3 0:e7ca326e76ee 580 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: received name field: %s\n",
mkersh3 0:e7ca326e76ee 581 rhostname));
mkersh3 0:e7ca326e76ee 582
mkersh3 0:e7ca326e76ee 583 /*
mkersh3 0:e7ca326e76ee 584 * Get secret for authenticating them with us,
mkersh3 0:e7ca326e76ee 585 * do the hash ourselves, and compare the result.
mkersh3 0:e7ca326e76ee 586 */
mkersh3 0:e7ca326e76ee 587 code = CHAP_FAILURE;
mkersh3 0:e7ca326e76ee 588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
mkersh3 0:e7ca326e76ee 589 secret, &secret_len, 1)) {
mkersh3 0:e7ca326e76ee 590 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating %s\n",
mkersh3 0:e7ca326e76ee 591 rhostname));
mkersh3 0:e7ca326e76ee 592 } else {
mkersh3 0:e7ca326e76ee 593 /* generate MD based on negotiated type */
mkersh3 0:e7ca326e76ee 594 switch (cstate->chal_type) {
mkersh3 0:e7ca326e76ee 595
mkersh3 0:e7ca326e76ee 596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
mkersh3 0:e7ca326e76ee 597 if (remmd_len != MD5_SIGNATURE_SIZE) {
mkersh3 0:e7ca326e76ee 598 break; /* it's not even the right length */
mkersh3 0:e7ca326e76ee 599 }
mkersh3 0:e7ca326e76ee 600 MD5Init(&mdContext);
mkersh3 0:e7ca326e76ee 601 MD5Update(&mdContext, &cstate->chal_id, 1);
mkersh3 0:e7ca326e76ee 602 MD5Update(&mdContext, (u_char*)secret, secret_len);
mkersh3 0:e7ca326e76ee 603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
mkersh3 0:e7ca326e76ee 604 MD5Final(hash, &mdContext);
mkersh3 0:e7ca326e76ee 605
mkersh3 0:e7ca326e76ee 606 /* compare local and remote MDs and send the appropriate status */
mkersh3 0:e7ca326e76ee 607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
mkersh3 0:e7ca326e76ee 608 code = CHAP_SUCCESS; /* they are the same! */
mkersh3 0:e7ca326e76ee 609 }
mkersh3 0:e7ca326e76ee 610 break;
mkersh3 0:e7ca326e76ee 611
mkersh3 0:e7ca326e76ee 612 default:
mkersh3 0:e7ca326e76ee 613 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->chal_type));
mkersh3 0:e7ca326e76ee 614 }
mkersh3 0:e7ca326e76ee 615 }
mkersh3 0:e7ca326e76ee 616
mkersh3 0:e7ca326e76ee 617 BZERO(secret, sizeof(secret));
mkersh3 0:e7ca326e76ee 618 ChapSendStatus(cstate, code);
mkersh3 0:e7ca326e76ee 619
mkersh3 0:e7ca326e76ee 620 if (code == CHAP_SUCCESS) {
mkersh3 0:e7ca326e76ee 621 old_state = cstate->serverstate;
mkersh3 0:e7ca326e76ee 622 cstate->serverstate = CHAPSS_OPEN;
mkersh3 0:e7ca326e76ee 623 if (old_state == CHAPSS_INITIAL_CHAL) {
mkersh3 0:e7ca326e76ee 624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
mkersh3 0:e7ca326e76ee 625 }
mkersh3 0:e7ca326e76ee 626 if (cstate->chal_interval != 0) {
mkersh3 0:e7ca326e76ee 627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
mkersh3 0:e7ca326e76ee 628 }
mkersh3 0:e7ca326e76ee 629 } else {
mkersh3 0:e7ca326e76ee 630 CHAPDEBUG(LOG_ERR, ("CHAP peer authentication failed\n"));
mkersh3 0:e7ca326e76ee 631 cstate->serverstate = CHAPSS_BADAUTH;
mkersh3 0:e7ca326e76ee 632 auth_peer_fail(cstate->unit, PPP_CHAP);
mkersh3 0:e7ca326e76ee 633 }
mkersh3 0:e7ca326e76ee 634 }
mkersh3 0:e7ca326e76ee 635
mkersh3 0:e7ca326e76ee 636 /*
mkersh3 0:e7ca326e76ee 637 * ChapReceiveSuccess - Receive Success
mkersh3 0:e7ca326e76ee 638 */
mkersh3 0:e7ca326e76ee 639 static void
mkersh3 0:e7ca326e76ee 640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
mkersh3 0:e7ca326e76ee 641 {
mkersh3 0:e7ca326e76ee 642 LWIP_UNUSED_ARG(id);
mkersh3 0:e7ca326e76ee 643 LWIP_UNUSED_ARG(inp);
mkersh3 0:e7ca326e76ee 644
mkersh3 0:e7ca326e76ee 645 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: Rcvd id %d.\n", id));
mkersh3 0:e7ca326e76ee 646
mkersh3 0:e7ca326e76ee 647 if (cstate->clientstate == CHAPCS_OPEN) {
mkersh3 0:e7ca326e76ee 648 /* presumably an answer to a duplicate response */
mkersh3 0:e7ca326e76ee 649 return;
mkersh3 0:e7ca326e76ee 650 }
mkersh3 0:e7ca326e76ee 651
mkersh3 0:e7ca326e76ee 652 if (cstate->clientstate != CHAPCS_RESPONSE) {
mkersh3 0:e7ca326e76ee 653 /* don't know what this is */
mkersh3 0:e7ca326e76ee 654 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: in state %d\n",
mkersh3 0:e7ca326e76ee 655 cstate->clientstate));
mkersh3 0:e7ca326e76ee 656 return;
mkersh3 0:e7ca326e76ee 657 }
mkersh3 0:e7ca326e76ee 658
mkersh3 0:e7ca326e76ee 659 UNTIMEOUT(ChapResponseTimeout, cstate);
mkersh3 0:e7ca326e76ee 660
mkersh3 0:e7ca326e76ee 661 /*
mkersh3 0:e7ca326e76ee 662 * Print message.
mkersh3 0:e7ca326e76ee 663 */
mkersh3 0:e7ca326e76ee 664 if (len > 0) {
mkersh3 0:e7ca326e76ee 665 PRINTMSG(inp, len);
mkersh3 0:e7ca326e76ee 666 }
mkersh3 0:e7ca326e76ee 667
mkersh3 0:e7ca326e76ee 668 cstate->clientstate = CHAPCS_OPEN;
mkersh3 0:e7ca326e76ee 669
mkersh3 0:e7ca326e76ee 670 auth_withpeer_success(cstate->unit, PPP_CHAP);
mkersh3 0:e7ca326e76ee 671 }
mkersh3 0:e7ca326e76ee 672
mkersh3 0:e7ca326e76ee 673
mkersh3 0:e7ca326e76ee 674 /*
mkersh3 0:e7ca326e76ee 675 * ChapReceiveFailure - Receive failure.
mkersh3 0:e7ca326e76ee 676 */
mkersh3 0:e7ca326e76ee 677 static void
mkersh3 0:e7ca326e76ee 678 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
mkersh3 0:e7ca326e76ee 679 {
mkersh3 0:e7ca326e76ee 680 LWIP_UNUSED_ARG(id);
mkersh3 0:e7ca326e76ee 681 LWIP_UNUSED_ARG(inp);
mkersh3 0:e7ca326e76ee 682
mkersh3 0:e7ca326e76ee 683 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: Rcvd id %d.\n", id));
mkersh3 0:e7ca326e76ee 684
mkersh3 0:e7ca326e76ee 685 if (cstate->clientstate != CHAPCS_RESPONSE) {
mkersh3 0:e7ca326e76ee 686 /* don't know what this is */
mkersh3 0:e7ca326e76ee 687 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: in state %d\n",
mkersh3 0:e7ca326e76ee 688 cstate->clientstate));
mkersh3 0:e7ca326e76ee 689 return;
mkersh3 0:e7ca326e76ee 690 }
mkersh3 0:e7ca326e76ee 691
mkersh3 0:e7ca326e76ee 692 UNTIMEOUT(ChapResponseTimeout, cstate);
mkersh3 0:e7ca326e76ee 693
mkersh3 0:e7ca326e76ee 694 /*
mkersh3 0:e7ca326e76ee 695 * Print message.
mkersh3 0:e7ca326e76ee 696 */
mkersh3 0:e7ca326e76ee 697 if (len > 0) {
mkersh3 0:e7ca326e76ee 698 PRINTMSG(inp, len);
mkersh3 0:e7ca326e76ee 699 }
mkersh3 0:e7ca326e76ee 700
mkersh3 0:e7ca326e76ee 701 CHAPDEBUG(LOG_ERR, ("CHAP authentication failed\n"));
mkersh3 0:e7ca326e76ee 702 auth_withpeer_fail(cstate->unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
mkersh3 0:e7ca326e76ee 703 }
mkersh3 0:e7ca326e76ee 704
mkersh3 0:e7ca326e76ee 705
mkersh3 0:e7ca326e76ee 706 /*
mkersh3 0:e7ca326e76ee 707 * ChapSendChallenge - Send an Authenticate challenge.
mkersh3 0:e7ca326e76ee 708 */
mkersh3 0:e7ca326e76ee 709 static void
mkersh3 0:e7ca326e76ee 710 ChapSendChallenge(chap_state *cstate)
mkersh3 0:e7ca326e76ee 711 {
mkersh3 0:e7ca326e76ee 712 u_char *outp;
mkersh3 0:e7ca326e76ee 713 int chal_len, name_len;
mkersh3 0:e7ca326e76ee 714 int outlen;
mkersh3 0:e7ca326e76ee 715
mkersh3 0:e7ca326e76ee 716 chal_len = cstate->chal_len;
mkersh3 0:e7ca326e76ee 717 name_len = (int)strlen(cstate->chal_name);
mkersh3 0:e7ca326e76ee 718 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
mkersh3 0:e7ca326e76ee 719 outp = outpacket_buf[cstate->unit];
mkersh3 0:e7ca326e76ee 720
mkersh3 0:e7ca326e76ee 721 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
mkersh3 0:e7ca326e76ee 722
mkersh3 0:e7ca326e76ee 723 PUTCHAR(CHAP_CHALLENGE, outp);
mkersh3 0:e7ca326e76ee 724 PUTCHAR(cstate->chal_id, outp);
mkersh3 0:e7ca326e76ee 725 PUTSHORT(outlen, outp);
mkersh3 0:e7ca326e76ee 726
mkersh3 0:e7ca326e76ee 727 PUTCHAR(chal_len, outp); /* put length of challenge */
mkersh3 0:e7ca326e76ee 728 BCOPY(cstate->challenge, outp, chal_len);
mkersh3 0:e7ca326e76ee 729 INCPTR(chal_len, outp);
mkersh3 0:e7ca326e76ee 730
mkersh3 0:e7ca326e76ee 731 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
mkersh3 0:e7ca326e76ee 732
mkersh3 0:e7ca326e76ee 733 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mkersh3 0:e7ca326e76ee 734
mkersh3 0:e7ca326e76ee 735 CHAPDEBUG(LOG_INFO, ("ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
mkersh3 0:e7ca326e76ee 736
mkersh3 0:e7ca326e76ee 737 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
mkersh3 0:e7ca326e76ee 738 ++cstate->chal_transmits;
mkersh3 0:e7ca326e76ee 739 }
mkersh3 0:e7ca326e76ee 740
mkersh3 0:e7ca326e76ee 741
mkersh3 0:e7ca326e76ee 742 /*
mkersh3 0:e7ca326e76ee 743 * ChapSendStatus - Send a status response (ack or nak).
mkersh3 0:e7ca326e76ee 744 */
mkersh3 0:e7ca326e76ee 745 static void
mkersh3 0:e7ca326e76ee 746 ChapSendStatus(chap_state *cstate, int code)
mkersh3 0:e7ca326e76ee 747 {
mkersh3 0:e7ca326e76ee 748 u_char *outp;
mkersh3 0:e7ca326e76ee 749 int outlen, msglen;
mkersh3 0:e7ca326e76ee 750 char msg[256]; /* @todo: this can be a char*, no strcpy needed */
mkersh3 0:e7ca326e76ee 751
mkersh3 0:e7ca326e76ee 752 if (code == CHAP_SUCCESS) {
mkersh3 0:e7ca326e76ee 753 strcpy(msg, "Welcome!");
mkersh3 0:e7ca326e76ee 754 } else {
mkersh3 0:e7ca326e76ee 755 strcpy(msg, "I don't like you. Go 'way.");
mkersh3 0:e7ca326e76ee 756 }
mkersh3 0:e7ca326e76ee 757 msglen = (int)strlen(msg);
mkersh3 0:e7ca326e76ee 758
mkersh3 0:e7ca326e76ee 759 outlen = CHAP_HEADERLEN + msglen;
mkersh3 0:e7ca326e76ee 760 outp = outpacket_buf[cstate->unit];
mkersh3 0:e7ca326e76ee 761
mkersh3 0:e7ca326e76ee 762 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
mkersh3 0:e7ca326e76ee 763
mkersh3 0:e7ca326e76ee 764 PUTCHAR(code, outp);
mkersh3 0:e7ca326e76ee 765 PUTCHAR(cstate->chal_id, outp);
mkersh3 0:e7ca326e76ee 766 PUTSHORT(outlen, outp);
mkersh3 0:e7ca326e76ee 767 BCOPY(msg, outp, msglen);
mkersh3 0:e7ca326e76ee 768 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mkersh3 0:e7ca326e76ee 769
mkersh3 0:e7ca326e76ee 770 CHAPDEBUG(LOG_INFO, ("ChapSendStatus: Sent code %d, id %d.\n", code,
mkersh3 0:e7ca326e76ee 771 cstate->chal_id));
mkersh3 0:e7ca326e76ee 772 }
mkersh3 0:e7ca326e76ee 773
mkersh3 0:e7ca326e76ee 774 /*
mkersh3 0:e7ca326e76ee 775 * ChapGenChallenge is used to generate a pseudo-random challenge string of
mkersh3 0:e7ca326e76ee 776 * a pseudo-random length between min_len and max_len. The challenge
mkersh3 0:e7ca326e76ee 777 * string and its length are stored in *cstate, and various other fields of
mkersh3 0:e7ca326e76ee 778 * *cstate are initialized.
mkersh3 0:e7ca326e76ee 779 */
mkersh3 0:e7ca326e76ee 780
mkersh3 0:e7ca326e76ee 781 static void
mkersh3 0:e7ca326e76ee 782 ChapGenChallenge(chap_state *cstate)
mkersh3 0:e7ca326e76ee 783 {
mkersh3 0:e7ca326e76ee 784 int chal_len;
mkersh3 0:e7ca326e76ee 785 u_char *ptr = cstate->challenge;
mkersh3 0:e7ca326e76ee 786 int i;
mkersh3 0:e7ca326e76ee 787
mkersh3 0:e7ca326e76ee 788 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
mkersh3 0:e7ca326e76ee 789 MAX_CHALLENGE_LENGTH */
mkersh3 0:e7ca326e76ee 790 chal_len = (unsigned)
mkersh3 0:e7ca326e76ee 791 ((((magic() >> 16) *
mkersh3 0:e7ca326e76ee 792 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
mkersh3 0:e7ca326e76ee 793 + MIN_CHALLENGE_LENGTH);
mkersh3 0:e7ca326e76ee 794 LWIP_ASSERT("chal_len <= 0xff", chal_len <= 0xffff);
mkersh3 0:e7ca326e76ee 795 cstate->chal_len = (u_char)chal_len;
mkersh3 0:e7ca326e76ee 796 cstate->chal_id = ++cstate->id;
mkersh3 0:e7ca326e76ee 797 cstate->chal_transmits = 0;
mkersh3 0:e7ca326e76ee 798
mkersh3 0:e7ca326e76ee 799 /* generate a random string */
mkersh3 0:e7ca326e76ee 800 for (i = 0; i < chal_len; i++ ) {
mkersh3 0:e7ca326e76ee 801 *ptr++ = (char) (magic() & 0xff);
mkersh3 0:e7ca326e76ee 802 }
mkersh3 0:e7ca326e76ee 803 }
mkersh3 0:e7ca326e76ee 804
mkersh3 0:e7ca326e76ee 805 /*
mkersh3 0:e7ca326e76ee 806 * ChapSendResponse - send a response packet with values as specified
mkersh3 0:e7ca326e76ee 807 * in *cstate.
mkersh3 0:e7ca326e76ee 808 */
mkersh3 0:e7ca326e76ee 809 /* ARGSUSED */
mkersh3 0:e7ca326e76ee 810 static void
mkersh3 0:e7ca326e76ee 811 ChapSendResponse(chap_state *cstate)
mkersh3 0:e7ca326e76ee 812 {
mkersh3 0:e7ca326e76ee 813 u_char *outp;
mkersh3 0:e7ca326e76ee 814 int outlen, md_len, name_len;
mkersh3 0:e7ca326e76ee 815
mkersh3 0:e7ca326e76ee 816 md_len = cstate->resp_length;
mkersh3 0:e7ca326e76ee 817 name_len = (int)strlen(cstate->resp_name);
mkersh3 0:e7ca326e76ee 818 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
mkersh3 0:e7ca326e76ee 819 outp = outpacket_buf[cstate->unit];
mkersh3 0:e7ca326e76ee 820
mkersh3 0:e7ca326e76ee 821 MAKEHEADER(outp, PPP_CHAP);
mkersh3 0:e7ca326e76ee 822
mkersh3 0:e7ca326e76ee 823 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
mkersh3 0:e7ca326e76ee 824 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
mkersh3 0:e7ca326e76ee 825 PUTSHORT(outlen, outp); /* packet length */
mkersh3 0:e7ca326e76ee 826
mkersh3 0:e7ca326e76ee 827 PUTCHAR(md_len, outp); /* length of MD */
mkersh3 0:e7ca326e76ee 828 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
mkersh3 0:e7ca326e76ee 829 INCPTR(md_len, outp);
mkersh3 0:e7ca326e76ee 830
mkersh3 0:e7ca326e76ee 831 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
mkersh3 0:e7ca326e76ee 832
mkersh3 0:e7ca326e76ee 833 /* send the packet */
mkersh3 0:e7ca326e76ee 834 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mkersh3 0:e7ca326e76ee 835
mkersh3 0:e7ca326e76ee 836 cstate->clientstate = CHAPCS_RESPONSE;
mkersh3 0:e7ca326e76ee 837 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
mkersh3 0:e7ca326e76ee 838 ++cstate->resp_transmits;
mkersh3 0:e7ca326e76ee 839 }
mkersh3 0:e7ca326e76ee 840
mkersh3 0:e7ca326e76ee 841 #if PPP_ADDITIONAL_CALLBACKS
mkersh3 0:e7ca326e76ee 842 static char *ChapCodenames[] = {
mkersh3 0:e7ca326e76ee 843 "Challenge", "Response", "Success", "Failure"
mkersh3 0:e7ca326e76ee 844 };
mkersh3 0:e7ca326e76ee 845 /*
mkersh3 0:e7ca326e76ee 846 * ChapPrintPkt - print the contents of a CHAP packet.
mkersh3 0:e7ca326e76ee 847 */
mkersh3 0:e7ca326e76ee 848 static int
mkersh3 0:e7ca326e76ee 849 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
mkersh3 0:e7ca326e76ee 850 {
mkersh3 0:e7ca326e76ee 851 int code, id, len;
mkersh3 0:e7ca326e76ee 852 int clen, nlen;
mkersh3 0:e7ca326e76ee 853 u_char x;
mkersh3 0:e7ca326e76ee 854
mkersh3 0:e7ca326e76ee 855 if (plen < CHAP_HEADERLEN) {
mkersh3 0:e7ca326e76ee 856 return 0;
mkersh3 0:e7ca326e76ee 857 }
mkersh3 0:e7ca326e76ee 858 GETCHAR(code, p);
mkersh3 0:e7ca326e76ee 859 GETCHAR(id, p);
mkersh3 0:e7ca326e76ee 860 GETSHORT(len, p);
mkersh3 0:e7ca326e76ee 861 if (len < CHAP_HEADERLEN || len > plen) {
mkersh3 0:e7ca326e76ee 862 return 0;
mkersh3 0:e7ca326e76ee 863 }
mkersh3 0:e7ca326e76ee 864
mkersh3 0:e7ca326e76ee 865 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
mkersh3 0:e7ca326e76ee 866 printer(arg, " %s", ChapCodenames[code-1]);
mkersh3 0:e7ca326e76ee 867 } else {
mkersh3 0:e7ca326e76ee 868 printer(arg, " code=0x%x", code);
mkersh3 0:e7ca326e76ee 869 }
mkersh3 0:e7ca326e76ee 870 printer(arg, " id=0x%x", id);
mkersh3 0:e7ca326e76ee 871 len -= CHAP_HEADERLEN;
mkersh3 0:e7ca326e76ee 872 switch (code) {
mkersh3 0:e7ca326e76ee 873 case CHAP_CHALLENGE:
mkersh3 0:e7ca326e76ee 874 case CHAP_RESPONSE:
mkersh3 0:e7ca326e76ee 875 if (len < 1) {
mkersh3 0:e7ca326e76ee 876 break;
mkersh3 0:e7ca326e76ee 877 }
mkersh3 0:e7ca326e76ee 878 clen = p[0];
mkersh3 0:e7ca326e76ee 879 if (len < clen + 1) {
mkersh3 0:e7ca326e76ee 880 break;
mkersh3 0:e7ca326e76ee 881 }
mkersh3 0:e7ca326e76ee 882 ++p;
mkersh3 0:e7ca326e76ee 883 nlen = len - clen - 1;
mkersh3 0:e7ca326e76ee 884 printer(arg, " <");
mkersh3 0:e7ca326e76ee 885 for (; clen > 0; --clen) {
mkersh3 0:e7ca326e76ee 886 GETCHAR(x, p);
mkersh3 0:e7ca326e76ee 887 printer(arg, "%.2x", x);
mkersh3 0:e7ca326e76ee 888 }
mkersh3 0:e7ca326e76ee 889 printer(arg, ">, name = %.*Z", nlen, p);
mkersh3 0:e7ca326e76ee 890 break;
mkersh3 0:e7ca326e76ee 891 case CHAP_FAILURE:
mkersh3 0:e7ca326e76ee 892 case CHAP_SUCCESS:
mkersh3 0:e7ca326e76ee 893 printer(arg, " %.*Z", len, p);
mkersh3 0:e7ca326e76ee 894 break;
mkersh3 0:e7ca326e76ee 895 default:
mkersh3 0:e7ca326e76ee 896 for (clen = len; clen > 0; --clen) {
mkersh3 0:e7ca326e76ee 897 GETCHAR(x, p);
mkersh3 0:e7ca326e76ee 898 printer(arg, " %.2x", x);
mkersh3 0:e7ca326e76ee 899 }
mkersh3 0:e7ca326e76ee 900 }
mkersh3 0:e7ca326e76ee 901
mkersh3 0:e7ca326e76ee 902 return len + CHAP_HEADERLEN;
mkersh3 0:e7ca326e76ee 903 }
mkersh3 0:e7ca326e76ee 904 #endif /* PPP_ADDITIONAL_CALLBACKS */
mkersh3 0:e7ca326e76ee 905
mkersh3 0:e7ca326e76ee 906 #endif /* CHAP_SUPPORT */
mkersh3 0:e7ca326e76ee 907
mkersh3 0:e7ca326e76ee 908 #endif /* PPP_SUPPORT */