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netif/ppp/chap.c@30:cb9095482c25, 2015-04-07 (annotated)

Committer:
klauss
Date:
Tue Apr 07 14:27:01 2015 +0000
Revision:
30:cb9095482c25
Parent:
0:51ac1d130fd4 
wip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
mbed_official 0:51ac1d130fd4 2 /*****************************************************************************
mbed_official 0:51ac1d130fd4 3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
mbed_official 0:51ac1d130fd4 6 * portions Copyright (c) 1997 by Global Election Systems Inc.
mbed_official 0:51ac1d130fd4 7 *
mbed_official 0:51ac1d130fd4 8 * The authors hereby grant permission to use, copy, modify, distribute,
mbed_official 0:51ac1d130fd4 9 * and license this software and its documentation for any purpose, provided
mbed_official 0:51ac1d130fd4 10 * that existing copyright notices are retained in all copies and that this
mbed_official 0:51ac1d130fd4 11 * notice and the following disclaimer are included verbatim in any
mbed_official 0:51ac1d130fd4 12 * distributions. No written agreement, license, or royalty fee is required
mbed_official 0:51ac1d130fd4 13 * for any of the authorized uses.
mbed_official 0:51ac1d130fd4 14 *
mbed_official 0:51ac1d130fd4 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
mbed_official 0:51ac1d130fd4 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
mbed_official 0:51ac1d130fd4 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
mbed_official 0:51ac1d130fd4 18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mbed_official 0:51ac1d130fd4 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
mbed_official 0:51ac1d130fd4 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
mbed_official 0:51ac1d130fd4 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
mbed_official 0:51ac1d130fd4 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
mbed_official 0:51ac1d130fd4 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
mbed_official 0:51ac1d130fd4 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 25 *
mbed_official 0:51ac1d130fd4 26 ******************************************************************************
mbed_official 0:51ac1d130fd4 27 * REVISION HISTORY
mbed_official 0:51ac1d130fd4 28 *
mbed_official 0:51ac1d130fd4 29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
mbed_official 0:51ac1d130fd4 30 * Ported to lwIP.
mbed_official 0:51ac1d130fd4 31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
mbed_official 0:51ac1d130fd4 32 * Original based on BSD chap.c.
mbed_official 0:51ac1d130fd4 33 *****************************************************************************/
mbed_official 0:51ac1d130fd4 34 /*
mbed_official 0:51ac1d130fd4 35 * chap.c - Challenge Handshake Authentication Protocol.
mbed_official 0:51ac1d130fd4 36 *
mbed_official 0:51ac1d130fd4 37 * Copyright (c) 1993 The Australian National University.
mbed_official 0:51ac1d130fd4 38 * All rights reserved.
mbed_official 0:51ac1d130fd4 39 *
mbed_official 0:51ac1d130fd4 40 * Redistribution and use in source and binary forms are permitted
mbed_official 0:51ac1d130fd4 41 * provided that the above copyright notice and this paragraph are
mbed_official 0:51ac1d130fd4 42 * duplicated in all such forms and that any documentation,
mbed_official 0:51ac1d130fd4 43 * advertising materials, and other materials related to such
mbed_official 0:51ac1d130fd4 44 * distribution and use acknowledge that the software was developed
mbed_official 0:51ac1d130fd4 45 * by the Australian National University. The name of the University
mbed_official 0:51ac1d130fd4 46 * may not be used to endorse or promote products derived from this
mbed_official 0:51ac1d130fd4 47 * software without specific prior written permission.
mbed_official 0:51ac1d130fd4 48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
mbed_official 0:51ac1d130fd4 49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
mbed_official 0:51ac1d130fd4 50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
mbed_official 0:51ac1d130fd4 51 *
mbed_official 0:51ac1d130fd4 52 * Copyright (c) 1991 Gregory M. Christy.
mbed_official 0:51ac1d130fd4 53 * All rights reserved.
mbed_official 0:51ac1d130fd4 54 *
mbed_official 0:51ac1d130fd4 55 * Redistribution and use in source and binary forms are permitted
mbed_official 0:51ac1d130fd4 56 * provided that the above copyright notice and this paragraph are
mbed_official 0:51ac1d130fd4 57 * duplicated in all such forms and that any documentation,
mbed_official 0:51ac1d130fd4 58 * advertising materials, and other materials related to such
mbed_official 0:51ac1d130fd4 59 * distribution and use acknowledge that the software was developed
mbed_official 0:51ac1d130fd4 60 * by Gregory M. Christy. The name of the author may not be used to
mbed_official 0:51ac1d130fd4 61 * endorse or promote products derived from this software without
mbed_official 0:51ac1d130fd4 62 * specific prior written permission.
mbed_official 0:51ac1d130fd4 63 *
mbed_official 0:51ac1d130fd4 64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
mbed_official 0:51ac1d130fd4 65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
mbed_official 0:51ac1d130fd4 66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
mbed_official 0:51ac1d130fd4 67 */
mbed_official 0:51ac1d130fd4 68
mbed_official 0:51ac1d130fd4 69 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 70
mbed_official 0:51ac1d130fd4 71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 72
mbed_official 0:51ac1d130fd4 73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 74
mbed_official 0:51ac1d130fd4 75 #include "ppp.h"
mbed_official 0:51ac1d130fd4 76 #include "pppdebug.h"
mbed_official 0:51ac1d130fd4 77
mbed_official 0:51ac1d130fd4 78 #include "magic.h"
mbed_official 0:51ac1d130fd4 79 #include "randm.h"
mbed_official 0:51ac1d130fd4 80 #include "auth.h"
mbed_official 0:51ac1d130fd4 81 #include "md5.h"
mbed_official 0:51ac1d130fd4 82 #include "chap.h"
mbed_official 0:51ac1d130fd4 83 #include "chpms.h"
mbed_official 0:51ac1d130fd4 84
mbed_official 0:51ac1d130fd4 85 #include <string.h>
mbed_official 0:51ac1d130fd4 86
mbed_official 0:51ac1d130fd4 87 #if 0 /* UNUSED */
mbed_official 0:51ac1d130fd4 88 /*
mbed_official 0:51ac1d130fd4 89 * Command-line options.
mbed_official 0:51ac1d130fd4 90 */
mbed_official 0:51ac1d130fd4 91 static option_t chap_option_list[] = {
mbed_official 0:51ac1d130fd4 92 { "chap-restart", o_int, &chap[0].timeouttime,
mbed_official 0:51ac1d130fd4 93 "Set timeout for CHAP" },
mbed_official 0:51ac1d130fd4 94 { "chap-max-challenge", o_int, &chap[0].max_transmits,
mbed_official 0:51ac1d130fd4 95 "Set max #xmits for challenge" },
mbed_official 0:51ac1d130fd4 96 { "chap-interval", o_int, &chap[0].chal_interval,
mbed_official 0:51ac1d130fd4 97 "Set interval for rechallenge" },
mbed_official 0:51ac1d130fd4 98 #ifdef MSLANMAN
mbed_official 0:51ac1d130fd4 99 { "ms-lanman", o_bool, &ms_lanman,
mbed_official 0:51ac1d130fd4 100 "Use LanMan passwd when using MS-CHAP", 1 },
mbed_official 0:51ac1d130fd4 101 #endif
mbed_official 0:51ac1d130fd4 102 { NULL }
mbed_official 0:51ac1d130fd4 103 };
mbed_official 0:51ac1d130fd4 104 #endif /* UNUSED */
mbed_official 0:51ac1d130fd4 105
mbed_official 0:51ac1d130fd4 106 /*
mbed_official 0:51ac1d130fd4 107 * Protocol entry points.
mbed_official 0:51ac1d130fd4 108 */
mbed_official 0:51ac1d130fd4 109 static void ChapInit (int);
mbed_official 0:51ac1d130fd4 110 static void ChapLowerUp (int);
mbed_official 0:51ac1d130fd4 111 static void ChapLowerDown (int);
mbed_official 0:51ac1d130fd4 112 static void ChapInput (int, u_char *, int);
mbed_official 0:51ac1d130fd4 113 static void ChapProtocolReject (int);
mbed_official 0:51ac1d130fd4 114 #if PPP_ADDITIONAL_CALLBACKS
mbed_official 0:51ac1d130fd4 115 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
mbed_official 0:51ac1d130fd4 116 #endif
mbed_official 0:51ac1d130fd4 117
mbed_official 0:51ac1d130fd4 118 struct protent chap_protent = {
mbed_official 0:51ac1d130fd4 119 PPP_CHAP,
mbed_official 0:51ac1d130fd4 120 ChapInit,
mbed_official 0:51ac1d130fd4 121 ChapInput,
mbed_official 0:51ac1d130fd4 122 ChapProtocolReject,
mbed_official 0:51ac1d130fd4 123 ChapLowerUp,
mbed_official 0:51ac1d130fd4 124 ChapLowerDown,
mbed_official 0:51ac1d130fd4 125 NULL,
mbed_official 0:51ac1d130fd4 126 NULL,
mbed_official 0:51ac1d130fd4 127 #if PPP_ADDITIONAL_CALLBACKS
mbed_official 0:51ac1d130fd4 128 ChapPrintPkt,
mbed_official 0:51ac1d130fd4 129 NULL,
mbed_official 0:51ac1d130fd4 130 #endif /* PPP_ADDITIONAL_CALLBACKS */
mbed_official 0:51ac1d130fd4 131 1,
mbed_official 0:51ac1d130fd4 132 "CHAP",
mbed_official 0:51ac1d130fd4 133 #if PPP_ADDITIONAL_CALLBACKS
mbed_official 0:51ac1d130fd4 134 NULL,
mbed_official 0:51ac1d130fd4 135 NULL,
mbed_official 0:51ac1d130fd4 136 NULL
mbed_official 0:51ac1d130fd4 137 #endif /* PPP_ADDITIONAL_CALLBACKS */
mbed_official 0:51ac1d130fd4 138 };
mbed_official 0:51ac1d130fd4 139
mbed_official 0:51ac1d130fd4 140 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
mbed_official 0:51ac1d130fd4 141
mbed_official 0:51ac1d130fd4 142 static void ChapChallengeTimeout (void *);
mbed_official 0:51ac1d130fd4 143 static void ChapResponseTimeout (void *);
mbed_official 0:51ac1d130fd4 144 static void ChapReceiveChallenge (chap_state *, u_char *, u_char, int);
mbed_official 0:51ac1d130fd4 145 static void ChapRechallenge (void *);
mbed_official 0:51ac1d130fd4 146 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
mbed_official 0:51ac1d130fd4 147 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
mbed_official 0:51ac1d130fd4 148 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
mbed_official 0:51ac1d130fd4 149 static void ChapSendStatus (chap_state *, int);
mbed_official 0:51ac1d130fd4 150 static void ChapSendChallenge (chap_state *);
mbed_official 0:51ac1d130fd4 151 static void ChapSendResponse (chap_state *);
mbed_official 0:51ac1d130fd4 152 static void ChapGenChallenge (chap_state *);
mbed_official 0:51ac1d130fd4 153
mbed_official 0:51ac1d130fd4 154 /*
mbed_official 0:51ac1d130fd4 155 * ChapInit - Initialize a CHAP unit.
mbed_official 0:51ac1d130fd4 156 */
mbed_official 0:51ac1d130fd4 157 static void
mbed_official 0:51ac1d130fd4 158 ChapInit(int unit)
mbed_official 0:51ac1d130fd4 159 {
mbed_official 0:51ac1d130fd4 160 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 161
mbed_official 0:51ac1d130fd4 162 BZERO(cstate, sizeof(*cstate));
mbed_official 0:51ac1d130fd4 163 cstate->unit = unit;
mbed_official 0:51ac1d130fd4 164 cstate->clientstate = CHAPCS_INITIAL;
mbed_official 0:51ac1d130fd4 165 cstate->serverstate = CHAPSS_INITIAL;
mbed_official 0:51ac1d130fd4 166 cstate->timeouttime = CHAP_DEFTIMEOUT;
mbed_official 0:51ac1d130fd4 167 cstate->max_transmits = CHAP_DEFTRANSMITS;
mbed_official 0:51ac1d130fd4 168 /* random number generator is initialized in magic_init */
mbed_official 0:51ac1d130fd4 169 }
mbed_official 0:51ac1d130fd4 170
mbed_official 0:51ac1d130fd4 171
mbed_official 0:51ac1d130fd4 172 /*
mbed_official 0:51ac1d130fd4 173 * ChapAuthWithPeer - Authenticate us with our peer (start client).
mbed_official 0:51ac1d130fd4 174 *
mbed_official 0:51ac1d130fd4 175 */
mbed_official 0:51ac1d130fd4 176 void
mbed_official 0:51ac1d130fd4 177 ChapAuthWithPeer(int unit, char *our_name, u_char digest)
mbed_official 0:51ac1d130fd4 178 {
mbed_official 0:51ac1d130fd4 179 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 180
mbed_official 0:51ac1d130fd4 181 cstate->resp_name = our_name;
mbed_official 0:51ac1d130fd4 182 cstate->resp_type = digest;
mbed_official 0:51ac1d130fd4 183
mbed_official 0:51ac1d130fd4 184 if (cstate->clientstate == CHAPCS_INITIAL ||
mbed_official 0:51ac1d130fd4 185 cstate->clientstate == CHAPCS_PENDING) {
mbed_official 0:51ac1d130fd4 186 /* lower layer isn't up - wait until later */
mbed_official 0:51ac1d130fd4 187 cstate->clientstate = CHAPCS_PENDING;
mbed_official 0:51ac1d130fd4 188 return;
mbed_official 0:51ac1d130fd4 189 }
mbed_official 0:51ac1d130fd4 190
mbed_official 0:51ac1d130fd4 191 /*
mbed_official 0:51ac1d130fd4 192 * We get here as a result of LCP coming up.
mbed_official 0:51ac1d130fd4 193 * So even if CHAP was open before, we will
mbed_official 0:51ac1d130fd4 194 * have to re-authenticate ourselves.
mbed_official 0:51ac1d130fd4 195 */
mbed_official 0:51ac1d130fd4 196 cstate->clientstate = CHAPCS_LISTEN;
mbed_official 0:51ac1d130fd4 197 }
mbed_official 0:51ac1d130fd4 198
mbed_official 0:51ac1d130fd4 199
mbed_official 0:51ac1d130fd4 200 /*
mbed_official 0:51ac1d130fd4 201 * ChapAuthPeer - Authenticate our peer (start server).
mbed_official 0:51ac1d130fd4 202 */
mbed_official 0:51ac1d130fd4 203 void
mbed_official 0:51ac1d130fd4 204 ChapAuthPeer(int unit, char *our_name, u_char digest)
mbed_official 0:51ac1d130fd4 205 {
mbed_official 0:51ac1d130fd4 206 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 207
mbed_official 0:51ac1d130fd4 208 cstate->chal_name = our_name;
mbed_official 0:51ac1d130fd4 209 cstate->chal_type = digest;
mbed_official 0:51ac1d130fd4 210
mbed_official 0:51ac1d130fd4 211 if (cstate->serverstate == CHAPSS_INITIAL ||
mbed_official 0:51ac1d130fd4 212 cstate->serverstate == CHAPSS_PENDING) {
mbed_official 0:51ac1d130fd4 213 /* lower layer isn't up - wait until later */
mbed_official 0:51ac1d130fd4 214 cstate->serverstate = CHAPSS_PENDING;
mbed_official 0:51ac1d130fd4 215 return;
mbed_official 0:51ac1d130fd4 216 }
mbed_official 0:51ac1d130fd4 217
mbed_official 0:51ac1d130fd4 218 ChapGenChallenge(cstate);
mbed_official 0:51ac1d130fd4 219 ChapSendChallenge(cstate); /* crank it up dude! */
mbed_official 0:51ac1d130fd4 220 cstate->serverstate = CHAPSS_INITIAL_CHAL;
mbed_official 0:51ac1d130fd4 221 }
mbed_official 0:51ac1d130fd4 222
mbed_official 0:51ac1d130fd4 223
mbed_official 0:51ac1d130fd4 224 /*
mbed_official 0:51ac1d130fd4 225 * ChapChallengeTimeout - Timeout expired on sending challenge.
mbed_official 0:51ac1d130fd4 226 */
mbed_official 0:51ac1d130fd4 227 static void
mbed_official 0:51ac1d130fd4 228 ChapChallengeTimeout(void *arg)
mbed_official 0:51ac1d130fd4 229 {
mbed_official 0:51ac1d130fd4 230 chap_state *cstate = (chap_state *) arg;
mbed_official 0:51ac1d130fd4 231
mbed_official 0:51ac1d130fd4 232 /* if we aren't sending challenges, don't worry. then again we */
mbed_official 0:51ac1d130fd4 233 /* probably shouldn't be here either */
mbed_official 0:51ac1d130fd4 234 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
mbed_official 0:51ac1d130fd4 235 cstate->serverstate != CHAPSS_RECHALLENGE) {
mbed_official 0:51ac1d130fd4 236 return;
mbed_official 0:51ac1d130fd4 237 }
mbed_official 0:51ac1d130fd4 238
mbed_official 0:51ac1d130fd4 239 if (cstate->chal_transmits >= cstate->max_transmits) {
mbed_official 0:51ac1d130fd4 240 /* give up on peer */
mbed_official 0:51ac1d130fd4 241 CHAPDEBUG(LOG_ERR, ("Peer failed to respond to CHAP challenge\n"));
mbed_official 0:51ac1d130fd4 242 cstate->serverstate = CHAPSS_BADAUTH;
mbed_official 0:51ac1d130fd4 243 auth_peer_fail(cstate->unit, PPP_CHAP);
mbed_official 0:51ac1d130fd4 244 return;
mbed_official 0:51ac1d130fd4 245 }
mbed_official 0:51ac1d130fd4 246
mbed_official 0:51ac1d130fd4 247 ChapSendChallenge(cstate); /* Re-send challenge */
mbed_official 0:51ac1d130fd4 248 }
mbed_official 0:51ac1d130fd4 249
mbed_official 0:51ac1d130fd4 250
mbed_official 0:51ac1d130fd4 251 /*
mbed_official 0:51ac1d130fd4 252 * ChapResponseTimeout - Timeout expired on sending response.
mbed_official 0:51ac1d130fd4 253 */
mbed_official 0:51ac1d130fd4 254 static void
mbed_official 0:51ac1d130fd4 255 ChapResponseTimeout(void *arg)
mbed_official 0:51ac1d130fd4 256 {
mbed_official 0:51ac1d130fd4 257 chap_state *cstate = (chap_state *) arg;
mbed_official 0:51ac1d130fd4 258
mbed_official 0:51ac1d130fd4 259 /* if we aren't sending a response, don't worry. */
mbed_official 0:51ac1d130fd4 260 if (cstate->clientstate != CHAPCS_RESPONSE) {
mbed_official 0:51ac1d130fd4 261 return;
mbed_official 0:51ac1d130fd4 262 }
mbed_official 0:51ac1d130fd4 263
mbed_official 0:51ac1d130fd4 264 ChapSendResponse(cstate); /* re-send response */
mbed_official 0:51ac1d130fd4 265 }
mbed_official 0:51ac1d130fd4 266
mbed_official 0:51ac1d130fd4 267
mbed_official 0:51ac1d130fd4 268 /*
mbed_official 0:51ac1d130fd4 269 * ChapRechallenge - Time to challenge the peer again.
mbed_official 0:51ac1d130fd4 270 */
mbed_official 0:51ac1d130fd4 271 static void
mbed_official 0:51ac1d130fd4 272 ChapRechallenge(void *arg)
mbed_official 0:51ac1d130fd4 273 {
mbed_official 0:51ac1d130fd4 274 chap_state *cstate = (chap_state *) arg;
mbed_official 0:51ac1d130fd4 275
mbed_official 0:51ac1d130fd4 276 /* if we aren't sending a response, don't worry. */
mbed_official 0:51ac1d130fd4 277 if (cstate->serverstate != CHAPSS_OPEN) {
mbed_official 0:51ac1d130fd4 278 return;
mbed_official 0:51ac1d130fd4 279 }
mbed_official 0:51ac1d130fd4 280
mbed_official 0:51ac1d130fd4 281 ChapGenChallenge(cstate);
mbed_official 0:51ac1d130fd4 282 ChapSendChallenge(cstate);
mbed_official 0:51ac1d130fd4 283 cstate->serverstate = CHAPSS_RECHALLENGE;
mbed_official 0:51ac1d130fd4 284 }
mbed_official 0:51ac1d130fd4 285
mbed_official 0:51ac1d130fd4 286
mbed_official 0:51ac1d130fd4 287 /*
mbed_official 0:51ac1d130fd4 288 * ChapLowerUp - The lower layer is up.
mbed_official 0:51ac1d130fd4 289 *
mbed_official 0:51ac1d130fd4 290 * Start up if we have pending requests.
mbed_official 0:51ac1d130fd4 291 */
mbed_official 0:51ac1d130fd4 292 static void
mbed_official 0:51ac1d130fd4 293 ChapLowerUp(int unit)
mbed_official 0:51ac1d130fd4 294 {
mbed_official 0:51ac1d130fd4 295 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 296
mbed_official 0:51ac1d130fd4 297 if (cstate->clientstate == CHAPCS_INITIAL) {
mbed_official 0:51ac1d130fd4 298 cstate->clientstate = CHAPCS_CLOSED;
mbed_official 0:51ac1d130fd4 299 } else if (cstate->clientstate == CHAPCS_PENDING) {
mbed_official 0:51ac1d130fd4 300 cstate->clientstate = CHAPCS_LISTEN;
mbed_official 0:51ac1d130fd4 301 }
mbed_official 0:51ac1d130fd4 302
mbed_official 0:51ac1d130fd4 303 if (cstate->serverstate == CHAPSS_INITIAL) {
mbed_official 0:51ac1d130fd4 304 cstate->serverstate = CHAPSS_CLOSED;
mbed_official 0:51ac1d130fd4 305 } else if (cstate->serverstate == CHAPSS_PENDING) {
mbed_official 0:51ac1d130fd4 306 ChapGenChallenge(cstate);
mbed_official 0:51ac1d130fd4 307 ChapSendChallenge(cstate);
mbed_official 0:51ac1d130fd4 308 cstate->serverstate = CHAPSS_INITIAL_CHAL;
mbed_official 0:51ac1d130fd4 309 }
mbed_official 0:51ac1d130fd4 310 }
mbed_official 0:51ac1d130fd4 311
mbed_official 0:51ac1d130fd4 312
mbed_official 0:51ac1d130fd4 313 /*
mbed_official 0:51ac1d130fd4 314 * ChapLowerDown - The lower layer is down.
mbed_official 0:51ac1d130fd4 315 *
mbed_official 0:51ac1d130fd4 316 * Cancel all timeouts.
mbed_official 0:51ac1d130fd4 317 */
mbed_official 0:51ac1d130fd4 318 static void
mbed_official 0:51ac1d130fd4 319 ChapLowerDown(int unit)
mbed_official 0:51ac1d130fd4 320 {
mbed_official 0:51ac1d130fd4 321 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 322
mbed_official 0:51ac1d130fd4 323 /* Timeout(s) pending? Cancel if so. */
mbed_official 0:51ac1d130fd4 324 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
mbed_official 0:51ac1d130fd4 325 cstate->serverstate == CHAPSS_RECHALLENGE) {
mbed_official 0:51ac1d130fd4 326 UNTIMEOUT(ChapChallengeTimeout, cstate);
mbed_official 0:51ac1d130fd4 327 } else if (cstate->serverstate == CHAPSS_OPEN
mbed_official 0:51ac1d130fd4 328 && cstate->chal_interval != 0) {
mbed_official 0:51ac1d130fd4 329 UNTIMEOUT(ChapRechallenge, cstate);
mbed_official 0:51ac1d130fd4 330 }
mbed_official 0:51ac1d130fd4 331 if (cstate->clientstate == CHAPCS_RESPONSE) {
mbed_official 0:51ac1d130fd4 332 UNTIMEOUT(ChapResponseTimeout, cstate);
mbed_official 0:51ac1d130fd4 333 }
mbed_official 0:51ac1d130fd4 334 cstate->clientstate = CHAPCS_INITIAL;
mbed_official 0:51ac1d130fd4 335 cstate->serverstate = CHAPSS_INITIAL;
mbed_official 0:51ac1d130fd4 336 }
mbed_official 0:51ac1d130fd4 337
mbed_official 0:51ac1d130fd4 338
mbed_official 0:51ac1d130fd4 339 /*
mbed_official 0:51ac1d130fd4 340 * ChapProtocolReject - Peer doesn't grok CHAP.
mbed_official 0:51ac1d130fd4 341 */
mbed_official 0:51ac1d130fd4 342 static void
mbed_official 0:51ac1d130fd4 343 ChapProtocolReject(int unit)
mbed_official 0:51ac1d130fd4 344 {
mbed_official 0:51ac1d130fd4 345 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 346
mbed_official 0:51ac1d130fd4 347 if (cstate->serverstate != CHAPSS_INITIAL &&
mbed_official 0:51ac1d130fd4 348 cstate->serverstate != CHAPSS_CLOSED) {
mbed_official 0:51ac1d130fd4 349 auth_peer_fail(unit, PPP_CHAP);
mbed_official 0:51ac1d130fd4 350 }
mbed_official 0:51ac1d130fd4 351 if (cstate->clientstate != CHAPCS_INITIAL &&
mbed_official 0:51ac1d130fd4 352 cstate->clientstate != CHAPCS_CLOSED) {
mbed_official 0:51ac1d130fd4 353 auth_withpeer_fail(unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
mbed_official 0:51ac1d130fd4 354 }
mbed_official 0:51ac1d130fd4 355 ChapLowerDown(unit); /* shutdown chap */
mbed_official 0:51ac1d130fd4 356 }
mbed_official 0:51ac1d130fd4 357
mbed_official 0:51ac1d130fd4 358
mbed_official 0:51ac1d130fd4 359 /*
mbed_official 0:51ac1d130fd4 360 * ChapInput - Input CHAP packet.
mbed_official 0:51ac1d130fd4 361 */
mbed_official 0:51ac1d130fd4 362 static void
mbed_official 0:51ac1d130fd4 363 ChapInput(int unit, u_char *inpacket, int packet_len)
mbed_official 0:51ac1d130fd4 364 {
mbed_official 0:51ac1d130fd4 365 chap_state *cstate = &chap[unit];
mbed_official 0:51ac1d130fd4 366 u_char *inp;
mbed_official 0:51ac1d130fd4 367 u_char code, id;
mbed_official 0:51ac1d130fd4 368 int len;
mbed_official 0:51ac1d130fd4 369
mbed_official 0:51ac1d130fd4 370 /*
mbed_official 0:51ac1d130fd4 371 * Parse header (code, id and length).
mbed_official 0:51ac1d130fd4 372 * If packet too short, drop it.
mbed_official 0:51ac1d130fd4 373 */
mbed_official 0:51ac1d130fd4 374 inp = inpacket;
mbed_official 0:51ac1d130fd4 375 if (packet_len < CHAP_HEADERLEN) {
mbed_official 0:51ac1d130fd4 376 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short header.\n"));
mbed_official 0:51ac1d130fd4 377 return;
mbed_official 0:51ac1d130fd4 378 }
mbed_official 0:51ac1d130fd4 379 GETCHAR(code, inp);
mbed_official 0:51ac1d130fd4 380 GETCHAR(id, inp);
mbed_official 0:51ac1d130fd4 381 GETSHORT(len, inp);
mbed_official 0:51ac1d130fd4 382 if (len < CHAP_HEADERLEN) {
mbed_official 0:51ac1d130fd4 383 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd illegal length.\n"));
mbed_official 0:51ac1d130fd4 384 return;
mbed_official 0:51ac1d130fd4 385 }
mbed_official 0:51ac1d130fd4 386 if (len > packet_len) {
mbed_official 0:51ac1d130fd4 387 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short packet.\n"));
mbed_official 0:51ac1d130fd4 388 return;
mbed_official 0:51ac1d130fd4 389 }
mbed_official 0:51ac1d130fd4 390 len -= CHAP_HEADERLEN;
mbed_official 0:51ac1d130fd4 391
mbed_official 0:51ac1d130fd4 392 /*
mbed_official 0:51ac1d130fd4 393 * Action depends on code (as in fact it usually does :-).
mbed_official 0:51ac1d130fd4 394 */
mbed_official 0:51ac1d130fd4 395 switch (code) {
mbed_official 0:51ac1d130fd4 396 case CHAP_CHALLENGE:
mbed_official 0:51ac1d130fd4 397 ChapReceiveChallenge(cstate, inp, id, len);
mbed_official 0:51ac1d130fd4 398 break;
mbed_official 0:51ac1d130fd4 399
mbed_official 0:51ac1d130fd4 400 case CHAP_RESPONSE:
mbed_official 0:51ac1d130fd4 401 ChapReceiveResponse(cstate, inp, id, len);
mbed_official 0:51ac1d130fd4 402 break;
mbed_official 0:51ac1d130fd4 403
mbed_official 0:51ac1d130fd4 404 case CHAP_FAILURE:
mbed_official 0:51ac1d130fd4 405 ChapReceiveFailure(cstate, inp, id, len);
mbed_official 0:51ac1d130fd4 406 break;
mbed_official 0:51ac1d130fd4 407
mbed_official 0:51ac1d130fd4 408 case CHAP_SUCCESS:
mbed_official 0:51ac1d130fd4 409 ChapReceiveSuccess(cstate, inp, id, len);
mbed_official 0:51ac1d130fd4 410 break;
mbed_official 0:51ac1d130fd4 411
mbed_official 0:51ac1d130fd4 412 default: /* Need code reject? */
mbed_official 0:51ac1d130fd4 413 CHAPDEBUG(LOG_WARNING, ("Unknown CHAP code (%d) received.\n", code));
mbed_official 0:51ac1d130fd4 414 break;
mbed_official 0:51ac1d130fd4 415 }
mbed_official 0:51ac1d130fd4 416 }
mbed_official 0:51ac1d130fd4 417
mbed_official 0:51ac1d130fd4 418
mbed_official 0:51ac1d130fd4 419 /*
mbed_official 0:51ac1d130fd4 420 * ChapReceiveChallenge - Receive Challenge and send Response.
mbed_official 0:51ac1d130fd4 421 */
mbed_official 0:51ac1d130fd4 422 static void
mbed_official 0:51ac1d130fd4 423 ChapReceiveChallenge(chap_state *cstate, u_char *inp, u_char id, int len)
mbed_official 0:51ac1d130fd4 424 {
mbed_official 0:51ac1d130fd4 425 int rchallenge_len;
mbed_official 0:51ac1d130fd4 426 u_char *rchallenge;
mbed_official 0:51ac1d130fd4 427 int secret_len;
mbed_official 0:51ac1d130fd4 428 char secret[MAXSECRETLEN];
mbed_official 0:51ac1d130fd4 429 char rhostname[256];
mbed_official 0:51ac1d130fd4 430 MD5_CTX mdContext;
mbed_official 0:51ac1d130fd4 431 u_char hash[MD5_SIGNATURE_SIZE];
mbed_official 0:51ac1d130fd4 432
mbed_official 0:51ac1d130fd4 433 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: Rcvd id %d.\n", id));
mbed_official 0:51ac1d130fd4 434 if (cstate->clientstate == CHAPCS_CLOSED ||
mbed_official 0:51ac1d130fd4 435 cstate->clientstate == CHAPCS_PENDING) {
mbed_official 0:51ac1d130fd4 436 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: in state %d\n",
mbed_official 0:51ac1d130fd4 437 cstate->clientstate));
mbed_official 0:51ac1d130fd4 438 return;
mbed_official 0:51ac1d130fd4 439 }
mbed_official 0:51ac1d130fd4 440
mbed_official 0:51ac1d130fd4 441 if (len < 2) {
mbed_official 0:51ac1d130fd4 442 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
mbed_official 0:51ac1d130fd4 443 return;
mbed_official 0:51ac1d130fd4 444 }
mbed_official 0:51ac1d130fd4 445
mbed_official 0:51ac1d130fd4 446 GETCHAR(rchallenge_len, inp);
mbed_official 0:51ac1d130fd4 447 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
mbed_official 0:51ac1d130fd4 448 if (len < 0) {
mbed_official 0:51ac1d130fd4 449 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
mbed_official 0:51ac1d130fd4 450 return;
mbed_official 0:51ac1d130fd4 451 }
mbed_official 0:51ac1d130fd4 452 rchallenge = inp;
mbed_official 0:51ac1d130fd4 453 INCPTR(rchallenge_len, inp);
mbed_official 0:51ac1d130fd4 454
mbed_official 0:51ac1d130fd4 455 if (len >= (int)sizeof(rhostname)) {
mbed_official 0:51ac1d130fd4 456 len = sizeof(rhostname) - 1;
mbed_official 0:51ac1d130fd4 457 }
mbed_official 0:51ac1d130fd4 458 BCOPY(inp, rhostname, len);
mbed_official 0:51ac1d130fd4 459 rhostname[len] = '\000';
mbed_official 0:51ac1d130fd4 460
mbed_official 0:51ac1d130fd4 461 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: received name field '%s'\n",
mbed_official 0:51ac1d130fd4 462 rhostname));
mbed_official 0:51ac1d130fd4 463
mbed_official 0:51ac1d130fd4 464 /* Microsoft doesn't send their name back in the PPP packet */
mbed_official 0:51ac1d130fd4 465 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
mbed_official 0:51ac1d130fd4 466 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
mbed_official 0:51ac1d130fd4 467 rhostname[sizeof(rhostname) - 1] = 0;
mbed_official 0:51ac1d130fd4 468 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: using '%s' as remote name\n",
mbed_official 0:51ac1d130fd4 469 rhostname));
mbed_official 0:51ac1d130fd4 470 }
mbed_official 0:51ac1d130fd4 471
mbed_official 0:51ac1d130fd4 472 /* get secret for authenticating ourselves with the specified host */
mbed_official 0:51ac1d130fd4 473 if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
mbed_official 0:51ac1d130fd4 474 secret, &secret_len, 0)) {
mbed_official 0:51ac1d130fd4 475 secret_len = 0; /* assume null secret if can't find one */
mbed_official 0:51ac1d130fd4 476 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating us to %s\n",
mbed_official 0:51ac1d130fd4 477 rhostname));
mbed_official 0:51ac1d130fd4 478 }
mbed_official 0:51ac1d130fd4 479
mbed_official 0:51ac1d130fd4 480 /* cancel response send timeout if necessary */
mbed_official 0:51ac1d130fd4 481 if (cstate->clientstate == CHAPCS_RESPONSE) {
mbed_official 0:51ac1d130fd4 482 UNTIMEOUT(ChapResponseTimeout, cstate);
mbed_official 0:51ac1d130fd4 483 }
mbed_official 0:51ac1d130fd4 484
mbed_official 0:51ac1d130fd4 485 cstate->resp_id = id;
mbed_official 0:51ac1d130fd4 486 cstate->resp_transmits = 0;
mbed_official 0:51ac1d130fd4 487
mbed_official 0:51ac1d130fd4 488 /* generate MD based on negotiated type */
mbed_official 0:51ac1d130fd4 489 switch (cstate->resp_type) {
mbed_official 0:51ac1d130fd4 490
mbed_official 0:51ac1d130fd4 491 case CHAP_DIGEST_MD5:
mbed_official 0:51ac1d130fd4 492 MD5Init(&mdContext);
mbed_official 0:51ac1d130fd4 493 MD5Update(&mdContext, &cstate->resp_id, 1);
mbed_official 0:51ac1d130fd4 494 MD5Update(&mdContext, (u_char*)secret, secret_len);
mbed_official 0:51ac1d130fd4 495 MD5Update(&mdContext, rchallenge, rchallenge_len);
mbed_official 0:51ac1d130fd4 496 MD5Final(hash, &mdContext);
mbed_official 0:51ac1d130fd4 497 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
mbed_official 0:51ac1d130fd4 498 cstate->resp_length = MD5_SIGNATURE_SIZE;
mbed_official 0:51ac1d130fd4 499 break;
mbed_official 0:51ac1d130fd4 500
mbed_official 0:51ac1d130fd4 501 #if MSCHAP_SUPPORT
mbed_official 0:51ac1d130fd4 502 case CHAP_MICROSOFT:
mbed_official 0:51ac1d130fd4 503 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
mbed_official 0:51ac1d130fd4 504 break;
mbed_official 0:51ac1d130fd4 505 #endif
mbed_official 0:51ac1d130fd4 506
mbed_official 0:51ac1d130fd4 507 default:
mbed_official 0:51ac1d130fd4 508 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->resp_type));
mbed_official 0:51ac1d130fd4 509 return;
mbed_official 0:51ac1d130fd4 510 }
mbed_official 0:51ac1d130fd4 511
mbed_official 0:51ac1d130fd4 512 BZERO(secret, sizeof(secret));
mbed_official 0:51ac1d130fd4 513 ChapSendResponse(cstate);
mbed_official 0:51ac1d130fd4 514 }
mbed_official 0:51ac1d130fd4 515
mbed_official 0:51ac1d130fd4 516
mbed_official 0:51ac1d130fd4 517 /*
mbed_official 0:51ac1d130fd4 518 * ChapReceiveResponse - Receive and process response.
mbed_official 0:51ac1d130fd4 519 */
mbed_official 0:51ac1d130fd4 520 static void
mbed_official 0:51ac1d130fd4 521 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
mbed_official 0:51ac1d130fd4 522 {
mbed_official 0:51ac1d130fd4 523 u_char *remmd, remmd_len;
mbed_official 0:51ac1d130fd4 524 int secret_len, old_state;
mbed_official 0:51ac1d130fd4 525 int code;
mbed_official 0:51ac1d130fd4 526 char rhostname[256];
mbed_official 0:51ac1d130fd4 527 MD5_CTX mdContext;
mbed_official 0:51ac1d130fd4 528 char secret[MAXSECRETLEN];
mbed_official 0:51ac1d130fd4 529 u_char hash[MD5_SIGNATURE_SIZE];
mbed_official 0:51ac1d130fd4 530
mbed_official 0:51ac1d130fd4 531 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: Rcvd id %d.\n", id));
mbed_official 0:51ac1d130fd4 532
mbed_official 0:51ac1d130fd4 533 if (cstate->serverstate == CHAPSS_CLOSED ||
mbed_official 0:51ac1d130fd4 534 cstate->serverstate == CHAPSS_PENDING) {
mbed_official 0:51ac1d130fd4 535 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: in state %d\n",
mbed_official 0:51ac1d130fd4 536 cstate->serverstate));
mbed_official 0:51ac1d130fd4 537 return;
mbed_official 0:51ac1d130fd4 538 }
mbed_official 0:51ac1d130fd4 539
mbed_official 0:51ac1d130fd4 540 if (id != cstate->chal_id) {
mbed_official 0:51ac1d130fd4 541 return; /* doesn't match ID of last challenge */
mbed_official 0:51ac1d130fd4 542 }
mbed_official 0:51ac1d130fd4 543
mbed_official 0:51ac1d130fd4 544 /*
mbed_official 0:51ac1d130fd4 545 * If we have received a duplicate or bogus Response,
mbed_official 0:51ac1d130fd4 546 * we have to send the same answer (Success/Failure)
mbed_official 0:51ac1d130fd4 547 * as we did for the first Response we saw.
mbed_official 0:51ac1d130fd4 548 */
mbed_official 0:51ac1d130fd4 549 if (cstate->serverstate == CHAPSS_OPEN) {
mbed_official 0:51ac1d130fd4 550 ChapSendStatus(cstate, CHAP_SUCCESS);
mbed_official 0:51ac1d130fd4 551 return;
mbed_official 0:51ac1d130fd4 552 }
mbed_official 0:51ac1d130fd4 553 if (cstate->serverstate == CHAPSS_BADAUTH) {
mbed_official 0:51ac1d130fd4 554 ChapSendStatus(cstate, CHAP_FAILURE);
mbed_official 0:51ac1d130fd4 555 return;
mbed_official 0:51ac1d130fd4 556 }
mbed_official 0:51ac1d130fd4 557
mbed_official 0:51ac1d130fd4 558 if (len < 2) {
mbed_official 0:51ac1d130fd4 559 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
mbed_official 0:51ac1d130fd4 560 return;
mbed_official 0:51ac1d130fd4 561 }
mbed_official 0:51ac1d130fd4 562 GETCHAR(remmd_len, inp); /* get length of MD */
mbed_official 0:51ac1d130fd4 563 remmd = inp; /* get pointer to MD */
mbed_official 0:51ac1d130fd4 564 INCPTR(remmd_len, inp);
mbed_official 0:51ac1d130fd4 565
mbed_official 0:51ac1d130fd4 566 len -= sizeof (u_char) + remmd_len;
mbed_official 0:51ac1d130fd4 567 if (len < 0) {
mbed_official 0:51ac1d130fd4 568 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
mbed_official 0:51ac1d130fd4 569 return;
mbed_official 0:51ac1d130fd4 570 }
mbed_official 0:51ac1d130fd4 571
mbed_official 0:51ac1d130fd4 572 UNTIMEOUT(ChapChallengeTimeout, cstate);
mbed_official 0:51ac1d130fd4 573
mbed_official 0:51ac1d130fd4 574 if (len >= (int)sizeof(rhostname)) {
mbed_official 0:51ac1d130fd4 575 len = sizeof(rhostname) - 1;
mbed_official 0:51ac1d130fd4 576 }
mbed_official 0:51ac1d130fd4 577 BCOPY(inp, rhostname, len);
mbed_official 0:51ac1d130fd4 578 rhostname[len] = '\000';
mbed_official 0:51ac1d130fd4 579
mbed_official 0:51ac1d130fd4 580 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: received name field: %s\n",
mbed_official 0:51ac1d130fd4 581 rhostname));
mbed_official 0:51ac1d130fd4 582
mbed_official 0:51ac1d130fd4 583 /*
mbed_official 0:51ac1d130fd4 584 * Get secret for authenticating them with us,
mbed_official 0:51ac1d130fd4 585 * do the hash ourselves, and compare the result.
mbed_official 0:51ac1d130fd4 586 */
mbed_official 0:51ac1d130fd4 587 code = CHAP_FAILURE;
mbed_official 0:51ac1d130fd4 588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
mbed_official 0:51ac1d130fd4 589 secret, &secret_len, 1)) {
mbed_official 0:51ac1d130fd4 590 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating %s\n",
mbed_official 0:51ac1d130fd4 591 rhostname));
mbed_official 0:51ac1d130fd4 592 } else {
mbed_official 0:51ac1d130fd4 593 /* generate MD based on negotiated type */
mbed_official 0:51ac1d130fd4 594 switch (cstate->chal_type) {
mbed_official 0:51ac1d130fd4 595
mbed_official 0:51ac1d130fd4 596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
mbed_official 0:51ac1d130fd4 597 if (remmd_len != MD5_SIGNATURE_SIZE) {
mbed_official 0:51ac1d130fd4 598 break; /* it's not even the right length */
mbed_official 0:51ac1d130fd4 599 }
mbed_official 0:51ac1d130fd4 600 MD5Init(&mdContext);
mbed_official 0:51ac1d130fd4 601 MD5Update(&mdContext, &cstate->chal_id, 1);
mbed_official 0:51ac1d130fd4 602 MD5Update(&mdContext, (u_char*)secret, secret_len);
mbed_official 0:51ac1d130fd4 603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
mbed_official 0:51ac1d130fd4 604 MD5Final(hash, &mdContext);
mbed_official 0:51ac1d130fd4 605
mbed_official 0:51ac1d130fd4 606 /* compare local and remote MDs and send the appropriate status */
mbed_official 0:51ac1d130fd4 607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
mbed_official 0:51ac1d130fd4 608 code = CHAP_SUCCESS; /* they are the same! */
mbed_official 0:51ac1d130fd4 609 }
mbed_official 0:51ac1d130fd4 610 break;
mbed_official 0:51ac1d130fd4 611
mbed_official 0:51ac1d130fd4 612 default:
mbed_official 0:51ac1d130fd4 613 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->chal_type));
mbed_official 0:51ac1d130fd4 614 }
mbed_official 0:51ac1d130fd4 615 }
mbed_official 0:51ac1d130fd4 616
mbed_official 0:51ac1d130fd4 617 BZERO(secret, sizeof(secret));
mbed_official 0:51ac1d130fd4 618 ChapSendStatus(cstate, code);
mbed_official 0:51ac1d130fd4 619
mbed_official 0:51ac1d130fd4 620 if (code == CHAP_SUCCESS) {
mbed_official 0:51ac1d130fd4 621 old_state = cstate->serverstate;
mbed_official 0:51ac1d130fd4 622 cstate->serverstate = CHAPSS_OPEN;
mbed_official 0:51ac1d130fd4 623 if (old_state == CHAPSS_INITIAL_CHAL) {
mbed_official 0:51ac1d130fd4 624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
mbed_official 0:51ac1d130fd4 625 }
mbed_official 0:51ac1d130fd4 626 if (cstate->chal_interval != 0) {
mbed_official 0:51ac1d130fd4 627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
mbed_official 0:51ac1d130fd4 628 }
mbed_official 0:51ac1d130fd4 629 } else {
mbed_official 0:51ac1d130fd4 630 CHAPDEBUG(LOG_ERR, ("CHAP peer authentication failed\n"));
mbed_official 0:51ac1d130fd4 631 cstate->serverstate = CHAPSS_BADAUTH;
mbed_official 0:51ac1d130fd4 632 auth_peer_fail(cstate->unit, PPP_CHAP);
mbed_official 0:51ac1d130fd4 633 }
mbed_official 0:51ac1d130fd4 634 }
mbed_official 0:51ac1d130fd4 635
mbed_official 0:51ac1d130fd4 636 /*
mbed_official 0:51ac1d130fd4 637 * ChapReceiveSuccess - Receive Success
mbed_official 0:51ac1d130fd4 638 */
mbed_official 0:51ac1d130fd4 639 static void
mbed_official 0:51ac1d130fd4 640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
mbed_official 0:51ac1d130fd4 641 {
mbed_official 0:51ac1d130fd4 642 LWIP_UNUSED_ARG(id);
mbed_official 0:51ac1d130fd4 643 LWIP_UNUSED_ARG(inp);
mbed_official 0:51ac1d130fd4 644
mbed_official 0:51ac1d130fd4 645 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: Rcvd id %d.\n", id));
mbed_official 0:51ac1d130fd4 646
mbed_official 0:51ac1d130fd4 647 if (cstate->clientstate == CHAPCS_OPEN) {
mbed_official 0:51ac1d130fd4 648 /* presumably an answer to a duplicate response */
mbed_official 0:51ac1d130fd4 649 return;
mbed_official 0:51ac1d130fd4 650 }
mbed_official 0:51ac1d130fd4 651
mbed_official 0:51ac1d130fd4 652 if (cstate->clientstate != CHAPCS_RESPONSE) {
mbed_official 0:51ac1d130fd4 653 /* don't know what this is */
mbed_official 0:51ac1d130fd4 654 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: in state %d\n",
mbed_official 0:51ac1d130fd4 655 cstate->clientstate));
mbed_official 0:51ac1d130fd4 656 return;
mbed_official 0:51ac1d130fd4 657 }
mbed_official 0:51ac1d130fd4 658
mbed_official 0:51ac1d130fd4 659 UNTIMEOUT(ChapResponseTimeout, cstate);
mbed_official 0:51ac1d130fd4 660
mbed_official 0:51ac1d130fd4 661 /*
mbed_official 0:51ac1d130fd4 662 * Print message.
mbed_official 0:51ac1d130fd4 663 */
mbed_official 0:51ac1d130fd4 664 if (len > 0) {
mbed_official 0:51ac1d130fd4 665 PRINTMSG(inp, len);
mbed_official 0:51ac1d130fd4 666 }
mbed_official 0:51ac1d130fd4 667
mbed_official 0:51ac1d130fd4 668 cstate->clientstate = CHAPCS_OPEN;
mbed_official 0:51ac1d130fd4 669
mbed_official 0:51ac1d130fd4 670 auth_withpeer_success(cstate->unit, PPP_CHAP);
mbed_official 0:51ac1d130fd4 671 }
mbed_official 0:51ac1d130fd4 672
mbed_official 0:51ac1d130fd4 673
mbed_official 0:51ac1d130fd4 674 /*
mbed_official 0:51ac1d130fd4 675 * ChapReceiveFailure - Receive failure.
mbed_official 0:51ac1d130fd4 676 */
mbed_official 0:51ac1d130fd4 677 static void
mbed_official 0:51ac1d130fd4 678 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
mbed_official 0:51ac1d130fd4 679 {
mbed_official 0:51ac1d130fd4 680 LWIP_UNUSED_ARG(id);
mbed_official 0:51ac1d130fd4 681 LWIP_UNUSED_ARG(inp);
mbed_official 0:51ac1d130fd4 682
mbed_official 0:51ac1d130fd4 683 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: Rcvd id %d.\n", id));
mbed_official 0:51ac1d130fd4 684
mbed_official 0:51ac1d130fd4 685 if (cstate->clientstate != CHAPCS_RESPONSE) {
mbed_official 0:51ac1d130fd4 686 /* don't know what this is */
mbed_official 0:51ac1d130fd4 687 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: in state %d\n",
mbed_official 0:51ac1d130fd4 688 cstate->clientstate));
mbed_official 0:51ac1d130fd4 689 return;
mbed_official 0:51ac1d130fd4 690 }
mbed_official 0:51ac1d130fd4 691
mbed_official 0:51ac1d130fd4 692 UNTIMEOUT(ChapResponseTimeout, cstate);
mbed_official 0:51ac1d130fd4 693
mbed_official 0:51ac1d130fd4 694 /*
mbed_official 0:51ac1d130fd4 695 * Print message.
mbed_official 0:51ac1d130fd4 696 */
mbed_official 0:51ac1d130fd4 697 if (len > 0) {
mbed_official 0:51ac1d130fd4 698 PRINTMSG(inp, len);
mbed_official 0:51ac1d130fd4 699 }
mbed_official 0:51ac1d130fd4 700
mbed_official 0:51ac1d130fd4 701 CHAPDEBUG(LOG_ERR, ("CHAP authentication failed\n"));
mbed_official 0:51ac1d130fd4 702 auth_withpeer_fail(cstate->unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
mbed_official 0:51ac1d130fd4 703 }
mbed_official 0:51ac1d130fd4 704
mbed_official 0:51ac1d130fd4 705
mbed_official 0:51ac1d130fd4 706 /*
mbed_official 0:51ac1d130fd4 707 * ChapSendChallenge - Send an Authenticate challenge.
mbed_official 0:51ac1d130fd4 708 */
mbed_official 0:51ac1d130fd4 709 static void
mbed_official 0:51ac1d130fd4 710 ChapSendChallenge(chap_state *cstate)
mbed_official 0:51ac1d130fd4 711 {
mbed_official 0:51ac1d130fd4 712 u_char *outp;
mbed_official 0:51ac1d130fd4 713 int chal_len, name_len;
mbed_official 0:51ac1d130fd4 714 int outlen;
mbed_official 0:51ac1d130fd4 715
mbed_official 0:51ac1d130fd4 716 chal_len = cstate->chal_len;
mbed_official 0:51ac1d130fd4 717 name_len = (int)strlen(cstate->chal_name);
mbed_official 0:51ac1d130fd4 718 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
mbed_official 0:51ac1d130fd4 719 outp = outpacket_buf[cstate->unit];
mbed_official 0:51ac1d130fd4 720
mbed_official 0:51ac1d130fd4 721 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
mbed_official 0:51ac1d130fd4 722
mbed_official 0:51ac1d130fd4 723 PUTCHAR(CHAP_CHALLENGE, outp);
mbed_official 0:51ac1d130fd4 724 PUTCHAR(cstate->chal_id, outp);
mbed_official 0:51ac1d130fd4 725 PUTSHORT(outlen, outp);
mbed_official 0:51ac1d130fd4 726
mbed_official 0:51ac1d130fd4 727 PUTCHAR(chal_len, outp); /* put length of challenge */
mbed_official 0:51ac1d130fd4 728 BCOPY(cstate->challenge, outp, chal_len);
mbed_official 0:51ac1d130fd4 729 INCPTR(chal_len, outp);
mbed_official 0:51ac1d130fd4 730
mbed_official 0:51ac1d130fd4 731 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
mbed_official 0:51ac1d130fd4 732
mbed_official 0:51ac1d130fd4 733 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mbed_official 0:51ac1d130fd4 734
mbed_official 0:51ac1d130fd4 735 CHAPDEBUG(LOG_INFO, ("ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
mbed_official 0:51ac1d130fd4 736
mbed_official 0:51ac1d130fd4 737 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
mbed_official 0:51ac1d130fd4 738 ++cstate->chal_transmits;
mbed_official 0:51ac1d130fd4 739 }
mbed_official 0:51ac1d130fd4 740
mbed_official 0:51ac1d130fd4 741
mbed_official 0:51ac1d130fd4 742 /*
mbed_official 0:51ac1d130fd4 743 * ChapSendStatus - Send a status response (ack or nak).
mbed_official 0:51ac1d130fd4 744 */
mbed_official 0:51ac1d130fd4 745 static void
mbed_official 0:51ac1d130fd4 746 ChapSendStatus(chap_state *cstate, int code)
mbed_official 0:51ac1d130fd4 747 {
mbed_official 0:51ac1d130fd4 748 u_char *outp;
mbed_official 0:51ac1d130fd4 749 int outlen, msglen;
mbed_official 0:51ac1d130fd4 750 char msg[256]; /* @todo: this can be a char*, no strcpy needed */
mbed_official 0:51ac1d130fd4 751
mbed_official 0:51ac1d130fd4 752 if (code == CHAP_SUCCESS) {
mbed_official 0:51ac1d130fd4 753 strcpy(msg, "Welcome!");
mbed_official 0:51ac1d130fd4 754 } else {
mbed_official 0:51ac1d130fd4 755 strcpy(msg, "I don't like you. Go 'way.");
mbed_official 0:51ac1d130fd4 756 }
mbed_official 0:51ac1d130fd4 757 msglen = (int)strlen(msg);
mbed_official 0:51ac1d130fd4 758
mbed_official 0:51ac1d130fd4 759 outlen = CHAP_HEADERLEN + msglen;
mbed_official 0:51ac1d130fd4 760 outp = outpacket_buf[cstate->unit];
mbed_official 0:51ac1d130fd4 761
mbed_official 0:51ac1d130fd4 762 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
mbed_official 0:51ac1d130fd4 763
mbed_official 0:51ac1d130fd4 764 PUTCHAR(code, outp);
mbed_official 0:51ac1d130fd4 765 PUTCHAR(cstate->chal_id, outp);
mbed_official 0:51ac1d130fd4 766 PUTSHORT(outlen, outp);
mbed_official 0:51ac1d130fd4 767 BCOPY(msg, outp, msglen);
mbed_official 0:51ac1d130fd4 768 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mbed_official 0:51ac1d130fd4 769
mbed_official 0:51ac1d130fd4 770 CHAPDEBUG(LOG_INFO, ("ChapSendStatus: Sent code %d, id %d.\n", code,
mbed_official 0:51ac1d130fd4 771 cstate->chal_id));
mbed_official 0:51ac1d130fd4 772 }
mbed_official 0:51ac1d130fd4 773
mbed_official 0:51ac1d130fd4 774 /*
mbed_official 0:51ac1d130fd4 775 * ChapGenChallenge is used to generate a pseudo-random challenge string of
mbed_official 0:51ac1d130fd4 776 * a pseudo-random length between min_len and max_len. The challenge
mbed_official 0:51ac1d130fd4 777 * string and its length are stored in *cstate, and various other fields of
mbed_official 0:51ac1d130fd4 778 * *cstate are initialized.
mbed_official 0:51ac1d130fd4 779 */
mbed_official 0:51ac1d130fd4 780
mbed_official 0:51ac1d130fd4 781 static void
mbed_official 0:51ac1d130fd4 782 ChapGenChallenge(chap_state *cstate)
mbed_official 0:51ac1d130fd4 783 {
mbed_official 0:51ac1d130fd4 784 int chal_len;
mbed_official 0:51ac1d130fd4 785 u_char *ptr = cstate->challenge;
mbed_official 0:51ac1d130fd4 786 int i;
mbed_official 0:51ac1d130fd4 787
mbed_official 0:51ac1d130fd4 788 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
mbed_official 0:51ac1d130fd4 789 MAX_CHALLENGE_LENGTH */
mbed_official 0:51ac1d130fd4 790 chal_len = (unsigned)
mbed_official 0:51ac1d130fd4 791 ((((magic() >> 16) *
mbed_official 0:51ac1d130fd4 792 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
mbed_official 0:51ac1d130fd4 793 + MIN_CHALLENGE_LENGTH);
mbed_official 0:51ac1d130fd4 794 LWIP_ASSERT("chal_len <= 0xff", chal_len <= 0xffff);
mbed_official 0:51ac1d130fd4 795 cstate->chal_len = (u_char)chal_len;
mbed_official 0:51ac1d130fd4 796 cstate->chal_id = ++cstate->id;
mbed_official 0:51ac1d130fd4 797 cstate->chal_transmits = 0;
mbed_official 0:51ac1d130fd4 798
mbed_official 0:51ac1d130fd4 799 /* generate a random string */
mbed_official 0:51ac1d130fd4 800 for (i = 0; i < chal_len; i++ ) {
mbed_official 0:51ac1d130fd4 801 *ptr++ = (char) (magic() & 0xff);
mbed_official 0:51ac1d130fd4 802 }
mbed_official 0:51ac1d130fd4 803 }
mbed_official 0:51ac1d130fd4 804
mbed_official 0:51ac1d130fd4 805 /*
mbed_official 0:51ac1d130fd4 806 * ChapSendResponse - send a response packet with values as specified
mbed_official 0:51ac1d130fd4 807 * in *cstate.
mbed_official 0:51ac1d130fd4 808 */
mbed_official 0:51ac1d130fd4 809 /* ARGSUSED */
mbed_official 0:51ac1d130fd4 810 static void
mbed_official 0:51ac1d130fd4 811 ChapSendResponse(chap_state *cstate)
mbed_official 0:51ac1d130fd4 812 {
mbed_official 0:51ac1d130fd4 813 u_char *outp;
mbed_official 0:51ac1d130fd4 814 int outlen, md_len, name_len;
mbed_official 0:51ac1d130fd4 815
mbed_official 0:51ac1d130fd4 816 md_len = cstate->resp_length;
mbed_official 0:51ac1d130fd4 817 name_len = (int)strlen(cstate->resp_name);
mbed_official 0:51ac1d130fd4 818 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
mbed_official 0:51ac1d130fd4 819 outp = outpacket_buf[cstate->unit];
mbed_official 0:51ac1d130fd4 820
mbed_official 0:51ac1d130fd4 821 MAKEHEADER(outp, PPP_CHAP);
mbed_official 0:51ac1d130fd4 822
mbed_official 0:51ac1d130fd4 823 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
mbed_official 0:51ac1d130fd4 824 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
mbed_official 0:51ac1d130fd4 825 PUTSHORT(outlen, outp); /* packet length */
mbed_official 0:51ac1d130fd4 826
mbed_official 0:51ac1d130fd4 827 PUTCHAR(md_len, outp); /* length of MD */
mbed_official 0:51ac1d130fd4 828 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
mbed_official 0:51ac1d130fd4 829 INCPTR(md_len, outp);
mbed_official 0:51ac1d130fd4 830
mbed_official 0:51ac1d130fd4 831 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
mbed_official 0:51ac1d130fd4 832
mbed_official 0:51ac1d130fd4 833 /* send the packet */
mbed_official 0:51ac1d130fd4 834 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
mbed_official 0:51ac1d130fd4 835
mbed_official 0:51ac1d130fd4 836 cstate->clientstate = CHAPCS_RESPONSE;
mbed_official 0:51ac1d130fd4 837 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
mbed_official 0:51ac1d130fd4 838 ++cstate->resp_transmits;
mbed_official 0:51ac1d130fd4 839 }
mbed_official 0:51ac1d130fd4 840
mbed_official 0:51ac1d130fd4 841 #if PPP_ADDITIONAL_CALLBACKS
mbed_official 0:51ac1d130fd4 842 static char *ChapCodenames[] = {
mbed_official 0:51ac1d130fd4 843 "Challenge", "Response", "Success", "Failure"
mbed_official 0:51ac1d130fd4 844 };
mbed_official 0:51ac1d130fd4 845 /*
mbed_official 0:51ac1d130fd4 846 * ChapPrintPkt - print the contents of a CHAP packet.
mbed_official 0:51ac1d130fd4 847 */
mbed_official 0:51ac1d130fd4 848 static int
mbed_official 0:51ac1d130fd4 849 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
mbed_official 0:51ac1d130fd4 850 {
mbed_official 0:51ac1d130fd4 851 int code, id, len;
mbed_official 0:51ac1d130fd4 852 int clen, nlen;
mbed_official 0:51ac1d130fd4 853 u_char x;
mbed_official 0:51ac1d130fd4 854
mbed_official 0:51ac1d130fd4 855 if (plen < CHAP_HEADERLEN) {
mbed_official 0:51ac1d130fd4 856 return 0;
mbed_official 0:51ac1d130fd4 857 }
mbed_official 0:51ac1d130fd4 858 GETCHAR(code, p);
mbed_official 0:51ac1d130fd4 859 GETCHAR(id, p);
mbed_official 0:51ac1d130fd4 860 GETSHORT(len, p);
mbed_official 0:51ac1d130fd4 861 if (len < CHAP_HEADERLEN || len > plen) {
mbed_official 0:51ac1d130fd4 862 return 0;
mbed_official 0:51ac1d130fd4 863 }
mbed_official 0:51ac1d130fd4 864
mbed_official 0:51ac1d130fd4 865 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
mbed_official 0:51ac1d130fd4 866 printer(arg, " %s", ChapCodenames[code-1]);
mbed_official 0:51ac1d130fd4 867 } else {
mbed_official 0:51ac1d130fd4 868 printer(arg, " code=0x%x", code);
mbed_official 0:51ac1d130fd4 869 }
mbed_official 0:51ac1d130fd4 870 printer(arg, " id=0x%x", id);
mbed_official 0:51ac1d130fd4 871 len -= CHAP_HEADERLEN;
mbed_official 0:51ac1d130fd4 872 switch (code) {
mbed_official 0:51ac1d130fd4 873 case CHAP_CHALLENGE:
mbed_official 0:51ac1d130fd4 874 case CHAP_RESPONSE:
mbed_official 0:51ac1d130fd4 875 if (len < 1) {
mbed_official 0:51ac1d130fd4 876 break;
mbed_official 0:51ac1d130fd4 877 }
mbed_official 0:51ac1d130fd4 878 clen = p[0];
mbed_official 0:51ac1d130fd4 879 if (len < clen + 1) {
mbed_official 0:51ac1d130fd4 880 break;
mbed_official 0:51ac1d130fd4 881 }
mbed_official 0:51ac1d130fd4 882 ++p;
mbed_official 0:51ac1d130fd4 883 nlen = len - clen - 1;
mbed_official 0:51ac1d130fd4 884 printer(arg, " <");
mbed_official 0:51ac1d130fd4 885 for (; clen > 0; --clen) {
mbed_official 0:51ac1d130fd4 886 GETCHAR(x, p);
mbed_official 0:51ac1d130fd4 887 printer(arg, "%.2x", x);
mbed_official 0:51ac1d130fd4 888 }
mbed_official 0:51ac1d130fd4 889 printer(arg, ">, name = %.*Z", nlen, p);
mbed_official 0:51ac1d130fd4 890 break;
mbed_official 0:51ac1d130fd4 891 case CHAP_FAILURE:
mbed_official 0:51ac1d130fd4 892 case CHAP_SUCCESS:
mbed_official 0:51ac1d130fd4 893 printer(arg, " %.*Z", len, p);
mbed_official 0:51ac1d130fd4 894 break;
mbed_official 0:51ac1d130fd4 895 default:
mbed_official 0:51ac1d130fd4 896 for (clen = len; clen > 0; --clen) {
mbed_official 0:51ac1d130fd4 897 GETCHAR(x, p);
mbed_official 0:51ac1d130fd4 898 printer(arg, " %.2x", x);
mbed_official 0:51ac1d130fd4 899 }
mbed_official 0:51ac1d130fd4 900 }
mbed_official 0:51ac1d130fd4 901
mbed_official 0:51ac1d130fd4 902 return len + CHAP_HEADERLEN;
mbed_official 0:51ac1d130fd4 903 }
mbed_official 0:51ac1d130fd4 904 #endif /* PPP_ADDITIONAL_CALLBACKS */
mbed_official 0:51ac1d130fd4 905
mbed_official 0:51ac1d130fd4 906 #endif /* CHAP_SUPPORT */
mbed_official 0:51ac1d130fd4 907
mbed_official 0:51ac1d130fd4 908 #endif /* PPP_SUPPORT */