Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

ソースの整理中ですが、利用はできます。

Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/netif/ppp/chap.c@0:7766f6712673, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:19:54 2014 +0000
Revision:
0:7766f6712673
???????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
yueee_yt 0:7766f6712673 2 /*****************************************************************************
yueee_yt 0:7766f6712673 3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
yueee_yt 0:7766f6712673 6 * portions Copyright (c) 1997 by Global Election Systems Inc.
yueee_yt 0:7766f6712673 7 *
yueee_yt 0:7766f6712673 8 * The authors hereby grant permission to use, copy, modify, distribute,
yueee_yt 0:7766f6712673 9 * and license this software and its documentation for any purpose, provided
yueee_yt 0:7766f6712673 10 * that existing copyright notices are retained in all copies and that this
yueee_yt 0:7766f6712673 11 * notice and the following disclaimer are included verbatim in any
yueee_yt 0:7766f6712673 12 * distributions. No written agreement, license, or royalty fee is required
yueee_yt 0:7766f6712673 13 * for any of the authorized uses.
yueee_yt 0:7766f6712673 14 *
yueee_yt 0:7766f6712673 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
yueee_yt 0:7766f6712673 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
yueee_yt 0:7766f6712673 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
yueee_yt 0:7766f6712673 18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
yueee_yt 0:7766f6712673 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
yueee_yt 0:7766f6712673 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
yueee_yt 0:7766f6712673 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
yueee_yt 0:7766f6712673 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
yueee_yt 0:7766f6712673 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
yueee_yt 0:7766f6712673 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
yueee_yt 0:7766f6712673 25 *
yueee_yt 0:7766f6712673 26 ******************************************************************************
yueee_yt 0:7766f6712673 27 * REVISION HISTORY
yueee_yt 0:7766f6712673 28 *
yueee_yt 0:7766f6712673 29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
yueee_yt 0:7766f6712673 30 * Ported to lwIP.
yueee_yt 0:7766f6712673 31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
yueee_yt 0:7766f6712673 32 * Original based on BSD chap.c.
yueee_yt 0:7766f6712673 33 *****************************************************************************/
yueee_yt 0:7766f6712673 34 /*
yueee_yt 0:7766f6712673 35 * chap.c - Challenge Handshake Authentication Protocol.
yueee_yt 0:7766f6712673 36 *
yueee_yt 0:7766f6712673 37 * Copyright (c) 1993 The Australian National University.
yueee_yt 0:7766f6712673 38 * All rights reserved.
yueee_yt 0:7766f6712673 39 *
yueee_yt 0:7766f6712673 40 * Redistribution and use in source and binary forms are permitted
yueee_yt 0:7766f6712673 41 * provided that the above copyright notice and this paragraph are
yueee_yt 0:7766f6712673 42 * duplicated in all such forms and that any documentation,
yueee_yt 0:7766f6712673 43 * advertising materials, and other materials related to such
yueee_yt 0:7766f6712673 44 * distribution and use acknowledge that the software was developed
yueee_yt 0:7766f6712673 45 * by the Australian National University. The name of the University
yueee_yt 0:7766f6712673 46 * may not be used to endorse or promote products derived from this
yueee_yt 0:7766f6712673 47 * software without specific prior written permission.
yueee_yt 0:7766f6712673 48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
yueee_yt 0:7766f6712673 49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
yueee_yt 0:7766f6712673 50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
yueee_yt 0:7766f6712673 51 *
yueee_yt 0:7766f6712673 52 * Copyright (c) 1991 Gregory M. Christy.
yueee_yt 0:7766f6712673 53 * All rights reserved.
yueee_yt 0:7766f6712673 54 *
yueee_yt 0:7766f6712673 55 * Redistribution and use in source and binary forms are permitted
yueee_yt 0:7766f6712673 56 * provided that the above copyright notice and this paragraph are
yueee_yt 0:7766f6712673 57 * duplicated in all such forms and that any documentation,
yueee_yt 0:7766f6712673 58 * advertising materials, and other materials related to such
yueee_yt 0:7766f6712673 59 * distribution and use acknowledge that the software was developed
yueee_yt 0:7766f6712673 60 * by Gregory M. Christy. The name of the author may not be used to
yueee_yt 0:7766f6712673 61 * endorse or promote products derived from this software without
yueee_yt 0:7766f6712673 62 * specific prior written permission.
yueee_yt 0:7766f6712673 63 *
yueee_yt 0:7766f6712673 64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
yueee_yt 0:7766f6712673 65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
yueee_yt 0:7766f6712673 66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
yueee_yt 0:7766f6712673 67 */
yueee_yt 0:7766f6712673 68
yueee_yt 0:7766f6712673 69 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 70
yueee_yt 0:7766f6712673 71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 72
yueee_yt 0:7766f6712673 73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 74
yueee_yt 0:7766f6712673 75 #include "ppp.h"
yueee_yt 0:7766f6712673 76 #include "pppdebug.h"
yueee_yt 0:7766f6712673 77
yueee_yt 0:7766f6712673 78 #include "magic.h"
yueee_yt 0:7766f6712673 79 #include "randm.h"
yueee_yt 0:7766f6712673 80 #include "auth.h"
yueee_yt 0:7766f6712673 81 #include "md5.h"
yueee_yt 0:7766f6712673 82 #include "chap.h"
yueee_yt 0:7766f6712673 83 #include "chpms.h"
yueee_yt 0:7766f6712673 84
yueee_yt 0:7766f6712673 85 #include <string.h>
yueee_yt 0:7766f6712673 86
yueee_yt 0:7766f6712673 87 #if 0 /* UNUSED */
yueee_yt 0:7766f6712673 88 /*
yueee_yt 0:7766f6712673 89 * Command-line options.
yueee_yt 0:7766f6712673 90 */
yueee_yt 0:7766f6712673 91 static option_t chap_option_list[] = {
yueee_yt 0:7766f6712673 92 { "chap-restart", o_int, &chap[0].timeouttime,
yueee_yt 0:7766f6712673 93 "Set timeout for CHAP" },
yueee_yt 0:7766f6712673 94 { "chap-max-challenge", o_int, &chap[0].max_transmits,
yueee_yt 0:7766f6712673 95 "Set max #xmits for challenge" },
yueee_yt 0:7766f6712673 96 { "chap-interval", o_int, &chap[0].chal_interval,
yueee_yt 0:7766f6712673 97 "Set interval for rechallenge" },
yueee_yt 0:7766f6712673 98 #ifdef MSLANMAN
yueee_yt 0:7766f6712673 99 { "ms-lanman", o_bool, &ms_lanman,
yueee_yt 0:7766f6712673 100 "Use LanMan passwd when using MS-CHAP", 1 },
yueee_yt 0:7766f6712673 101 #endif
yueee_yt 0:7766f6712673 102 { NULL }
yueee_yt 0:7766f6712673 103 };
yueee_yt 0:7766f6712673 104 #endif /* UNUSED */
yueee_yt 0:7766f6712673 105
yueee_yt 0:7766f6712673 106 /*
yueee_yt 0:7766f6712673 107 * Protocol entry points.
yueee_yt 0:7766f6712673 108 */
yueee_yt 0:7766f6712673 109 static void ChapInit (int);
yueee_yt 0:7766f6712673 110 static void ChapLowerUp (int);
yueee_yt 0:7766f6712673 111 static void ChapLowerDown (int);
yueee_yt 0:7766f6712673 112 static void ChapInput (int, u_char *, int);
yueee_yt 0:7766f6712673 113 static void ChapProtocolReject (int);
yueee_yt 0:7766f6712673 114 #if PPP_ADDITIONAL_CALLBACKS
yueee_yt 0:7766f6712673 115 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
yueee_yt 0:7766f6712673 116 #endif
yueee_yt 0:7766f6712673 117
yueee_yt 0:7766f6712673 118 struct protent chap_protent = {
yueee_yt 0:7766f6712673 119 PPP_CHAP,
yueee_yt 0:7766f6712673 120 ChapInit,
yueee_yt 0:7766f6712673 121 ChapInput,
yueee_yt 0:7766f6712673 122 ChapProtocolReject,
yueee_yt 0:7766f6712673 123 ChapLowerUp,
yueee_yt 0:7766f6712673 124 ChapLowerDown,
yueee_yt 0:7766f6712673 125 NULL,
yueee_yt 0:7766f6712673 126 NULL,
yueee_yt 0:7766f6712673 127 #if PPP_ADDITIONAL_CALLBACKS
yueee_yt 0:7766f6712673 128 ChapPrintPkt,
yueee_yt 0:7766f6712673 129 NULL,
yueee_yt 0:7766f6712673 130 #endif /* PPP_ADDITIONAL_CALLBACKS */
yueee_yt 0:7766f6712673 131 1,
yueee_yt 0:7766f6712673 132 "CHAP",
yueee_yt 0:7766f6712673 133 #if PPP_ADDITIONAL_CALLBACKS
yueee_yt 0:7766f6712673 134 NULL,
yueee_yt 0:7766f6712673 135 NULL,
yueee_yt 0:7766f6712673 136 NULL
yueee_yt 0:7766f6712673 137 #endif /* PPP_ADDITIONAL_CALLBACKS */
yueee_yt 0:7766f6712673 138 };
yueee_yt 0:7766f6712673 139
yueee_yt 0:7766f6712673 140 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
yueee_yt 0:7766f6712673 141
yueee_yt 0:7766f6712673 142 static void ChapChallengeTimeout (void *);
yueee_yt 0:7766f6712673 143 static void ChapResponseTimeout (void *);
yueee_yt 0:7766f6712673 144 static void ChapReceiveChallenge (chap_state *, u_char *, u_char, int);
yueee_yt 0:7766f6712673 145 static void ChapRechallenge (void *);
yueee_yt 0:7766f6712673 146 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
yueee_yt 0:7766f6712673 147 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
yueee_yt 0:7766f6712673 148 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
yueee_yt 0:7766f6712673 149 static void ChapSendStatus (chap_state *, int);
yueee_yt 0:7766f6712673 150 static void ChapSendChallenge (chap_state *);
yueee_yt 0:7766f6712673 151 static void ChapSendResponse (chap_state *);
yueee_yt 0:7766f6712673 152 static void ChapGenChallenge (chap_state *);
yueee_yt 0:7766f6712673 153
yueee_yt 0:7766f6712673 154 /*
yueee_yt 0:7766f6712673 155 * ChapInit - Initialize a CHAP unit.
yueee_yt 0:7766f6712673 156 */
yueee_yt 0:7766f6712673 157 static void
yueee_yt 0:7766f6712673 158 ChapInit(int unit)
yueee_yt 0:7766f6712673 159 {
yueee_yt 0:7766f6712673 160 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 161
yueee_yt 0:7766f6712673 162 BZERO(cstate, sizeof(*cstate));
yueee_yt 0:7766f6712673 163 cstate->unit = unit;
yueee_yt 0:7766f6712673 164 cstate->clientstate = CHAPCS_INITIAL;
yueee_yt 0:7766f6712673 165 cstate->serverstate = CHAPSS_INITIAL;
yueee_yt 0:7766f6712673 166 cstate->timeouttime = CHAP_DEFTIMEOUT;
yueee_yt 0:7766f6712673 167 cstate->max_transmits = CHAP_DEFTRANSMITS;
yueee_yt 0:7766f6712673 168 /* random number generator is initialized in magic_init */
yueee_yt 0:7766f6712673 169 }
yueee_yt 0:7766f6712673 170
yueee_yt 0:7766f6712673 171
yueee_yt 0:7766f6712673 172 /*
yueee_yt 0:7766f6712673 173 * ChapAuthWithPeer - Authenticate us with our peer (start client).
yueee_yt 0:7766f6712673 174 *
yueee_yt 0:7766f6712673 175 */
yueee_yt 0:7766f6712673 176 void
yueee_yt 0:7766f6712673 177 ChapAuthWithPeer(int unit, char *our_name, u_char digest)
yueee_yt 0:7766f6712673 178 {
yueee_yt 0:7766f6712673 179 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 180
yueee_yt 0:7766f6712673 181 cstate->resp_name = our_name;
yueee_yt 0:7766f6712673 182 cstate->resp_type = digest;
yueee_yt 0:7766f6712673 183
yueee_yt 0:7766f6712673 184 if (cstate->clientstate == CHAPCS_INITIAL ||
yueee_yt 0:7766f6712673 185 cstate->clientstate == CHAPCS_PENDING) {
yueee_yt 0:7766f6712673 186 /* lower layer isn't up - wait until later */
yueee_yt 0:7766f6712673 187 cstate->clientstate = CHAPCS_PENDING;
yueee_yt 0:7766f6712673 188 return;
yueee_yt 0:7766f6712673 189 }
yueee_yt 0:7766f6712673 190
yueee_yt 0:7766f6712673 191 /*
yueee_yt 0:7766f6712673 192 * We get here as a result of LCP coming up.
yueee_yt 0:7766f6712673 193 * So even if CHAP was open before, we will
yueee_yt 0:7766f6712673 194 * have to re-authenticate ourselves.
yueee_yt 0:7766f6712673 195 */
yueee_yt 0:7766f6712673 196 cstate->clientstate = CHAPCS_LISTEN;
yueee_yt 0:7766f6712673 197 }
yueee_yt 0:7766f6712673 198
yueee_yt 0:7766f6712673 199
yueee_yt 0:7766f6712673 200 /*
yueee_yt 0:7766f6712673 201 * ChapAuthPeer - Authenticate our peer (start server).
yueee_yt 0:7766f6712673 202 */
yueee_yt 0:7766f6712673 203 void
yueee_yt 0:7766f6712673 204 ChapAuthPeer(int unit, char *our_name, u_char digest)
yueee_yt 0:7766f6712673 205 {
yueee_yt 0:7766f6712673 206 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 207
yueee_yt 0:7766f6712673 208 cstate->chal_name = our_name;
yueee_yt 0:7766f6712673 209 cstate->chal_type = digest;
yueee_yt 0:7766f6712673 210
yueee_yt 0:7766f6712673 211 if (cstate->serverstate == CHAPSS_INITIAL ||
yueee_yt 0:7766f6712673 212 cstate->serverstate == CHAPSS_PENDING) {
yueee_yt 0:7766f6712673 213 /* lower layer isn't up - wait until later */
yueee_yt 0:7766f6712673 214 cstate->serverstate = CHAPSS_PENDING;
yueee_yt 0:7766f6712673 215 return;
yueee_yt 0:7766f6712673 216 }
yueee_yt 0:7766f6712673 217
yueee_yt 0:7766f6712673 218 ChapGenChallenge(cstate);
yueee_yt 0:7766f6712673 219 ChapSendChallenge(cstate); /* crank it up dude! */
yueee_yt 0:7766f6712673 220 cstate->serverstate = CHAPSS_INITIAL_CHAL;
yueee_yt 0:7766f6712673 221 }
yueee_yt 0:7766f6712673 222
yueee_yt 0:7766f6712673 223
yueee_yt 0:7766f6712673 224 /*
yueee_yt 0:7766f6712673 225 * ChapChallengeTimeout - Timeout expired on sending challenge.
yueee_yt 0:7766f6712673 226 */
yueee_yt 0:7766f6712673 227 static void
yueee_yt 0:7766f6712673 228 ChapChallengeTimeout(void *arg)
yueee_yt 0:7766f6712673 229 {
yueee_yt 0:7766f6712673 230 chap_state *cstate = (chap_state *) arg;
yueee_yt 0:7766f6712673 231
yueee_yt 0:7766f6712673 232 /* if we aren't sending challenges, don't worry. then again we */
yueee_yt 0:7766f6712673 233 /* probably shouldn't be here either */
yueee_yt 0:7766f6712673 234 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
yueee_yt 0:7766f6712673 235 cstate->serverstate != CHAPSS_RECHALLENGE) {
yueee_yt 0:7766f6712673 236 return;
yueee_yt 0:7766f6712673 237 }
yueee_yt 0:7766f6712673 238
yueee_yt 0:7766f6712673 239 if (cstate->chal_transmits >= cstate->max_transmits) {
yueee_yt 0:7766f6712673 240 /* give up on peer */
yueee_yt 0:7766f6712673 241 CHAPDEBUG(LOG_ERR, ("Peer failed to respond to CHAP challenge\n"));
yueee_yt 0:7766f6712673 242 cstate->serverstate = CHAPSS_BADAUTH;
yueee_yt 0:7766f6712673 243 auth_peer_fail(cstate->unit, PPP_CHAP);
yueee_yt 0:7766f6712673 244 return;
yueee_yt 0:7766f6712673 245 }
yueee_yt 0:7766f6712673 246
yueee_yt 0:7766f6712673 247 ChapSendChallenge(cstate); /* Re-send challenge */
yueee_yt 0:7766f6712673 248 }
yueee_yt 0:7766f6712673 249
yueee_yt 0:7766f6712673 250
yueee_yt 0:7766f6712673 251 /*
yueee_yt 0:7766f6712673 252 * ChapResponseTimeout - Timeout expired on sending response.
yueee_yt 0:7766f6712673 253 */
yueee_yt 0:7766f6712673 254 static void
yueee_yt 0:7766f6712673 255 ChapResponseTimeout(void *arg)
yueee_yt 0:7766f6712673 256 {
yueee_yt 0:7766f6712673 257 chap_state *cstate = (chap_state *) arg;
yueee_yt 0:7766f6712673 258
yueee_yt 0:7766f6712673 259 /* if we aren't sending a response, don't worry. */
yueee_yt 0:7766f6712673 260 if (cstate->clientstate != CHAPCS_RESPONSE) {
yueee_yt 0:7766f6712673 261 return;
yueee_yt 0:7766f6712673 262 }
yueee_yt 0:7766f6712673 263
yueee_yt 0:7766f6712673 264 ChapSendResponse(cstate); /* re-send response */
yueee_yt 0:7766f6712673 265 }
yueee_yt 0:7766f6712673 266
yueee_yt 0:7766f6712673 267
yueee_yt 0:7766f6712673 268 /*
yueee_yt 0:7766f6712673 269 * ChapRechallenge - Time to challenge the peer again.
yueee_yt 0:7766f6712673 270 */
yueee_yt 0:7766f6712673 271 static void
yueee_yt 0:7766f6712673 272 ChapRechallenge(void *arg)
yueee_yt 0:7766f6712673 273 {
yueee_yt 0:7766f6712673 274 chap_state *cstate = (chap_state *) arg;
yueee_yt 0:7766f6712673 275
yueee_yt 0:7766f6712673 276 /* if we aren't sending a response, don't worry. */
yueee_yt 0:7766f6712673 277 if (cstate->serverstate != CHAPSS_OPEN) {
yueee_yt 0:7766f6712673 278 return;
yueee_yt 0:7766f6712673 279 }
yueee_yt 0:7766f6712673 280
yueee_yt 0:7766f6712673 281 ChapGenChallenge(cstate);
yueee_yt 0:7766f6712673 282 ChapSendChallenge(cstate);
yueee_yt 0:7766f6712673 283 cstate->serverstate = CHAPSS_RECHALLENGE;
yueee_yt 0:7766f6712673 284 }
yueee_yt 0:7766f6712673 285
yueee_yt 0:7766f6712673 286
yueee_yt 0:7766f6712673 287 /*
yueee_yt 0:7766f6712673 288 * ChapLowerUp - The lower layer is up.
yueee_yt 0:7766f6712673 289 *
yueee_yt 0:7766f6712673 290 * Start up if we have pending requests.
yueee_yt 0:7766f6712673 291 */
yueee_yt 0:7766f6712673 292 static void
yueee_yt 0:7766f6712673 293 ChapLowerUp(int unit)
yueee_yt 0:7766f6712673 294 {
yueee_yt 0:7766f6712673 295 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 296
yueee_yt 0:7766f6712673 297 if (cstate->clientstate == CHAPCS_INITIAL) {
yueee_yt 0:7766f6712673 298 cstate->clientstate = CHAPCS_CLOSED;
yueee_yt 0:7766f6712673 299 } else if (cstate->clientstate == CHAPCS_PENDING) {
yueee_yt 0:7766f6712673 300 cstate->clientstate = CHAPCS_LISTEN;
yueee_yt 0:7766f6712673 301 }
yueee_yt 0:7766f6712673 302
yueee_yt 0:7766f6712673 303 if (cstate->serverstate == CHAPSS_INITIAL) {
yueee_yt 0:7766f6712673 304 cstate->serverstate = CHAPSS_CLOSED;
yueee_yt 0:7766f6712673 305 } else if (cstate->serverstate == CHAPSS_PENDING) {
yueee_yt 0:7766f6712673 306 ChapGenChallenge(cstate);
yueee_yt 0:7766f6712673 307 ChapSendChallenge(cstate);
yueee_yt 0:7766f6712673 308 cstate->serverstate = CHAPSS_INITIAL_CHAL;
yueee_yt 0:7766f6712673 309 }
yueee_yt 0:7766f6712673 310 }
yueee_yt 0:7766f6712673 311
yueee_yt 0:7766f6712673 312
yueee_yt 0:7766f6712673 313 /*
yueee_yt 0:7766f6712673 314 * ChapLowerDown - The lower layer is down.
yueee_yt 0:7766f6712673 315 *
yueee_yt 0:7766f6712673 316 * Cancel all timeouts.
yueee_yt 0:7766f6712673 317 */
yueee_yt 0:7766f6712673 318 static void
yueee_yt 0:7766f6712673 319 ChapLowerDown(int unit)
yueee_yt 0:7766f6712673 320 {
yueee_yt 0:7766f6712673 321 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 322
yueee_yt 0:7766f6712673 323 /* Timeout(s) pending? Cancel if so. */
yueee_yt 0:7766f6712673 324 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
yueee_yt 0:7766f6712673 325 cstate->serverstate == CHAPSS_RECHALLENGE) {
yueee_yt 0:7766f6712673 326 UNTIMEOUT(ChapChallengeTimeout, cstate);
yueee_yt 0:7766f6712673 327 } else if (cstate->serverstate == CHAPSS_OPEN
yueee_yt 0:7766f6712673 328 && cstate->chal_interval != 0) {
yueee_yt 0:7766f6712673 329 UNTIMEOUT(ChapRechallenge, cstate);
yueee_yt 0:7766f6712673 330 }
yueee_yt 0:7766f6712673 331 if (cstate->clientstate == CHAPCS_RESPONSE) {
yueee_yt 0:7766f6712673 332 UNTIMEOUT(ChapResponseTimeout, cstate);
yueee_yt 0:7766f6712673 333 }
yueee_yt 0:7766f6712673 334 cstate->clientstate = CHAPCS_INITIAL;
yueee_yt 0:7766f6712673 335 cstate->serverstate = CHAPSS_INITIAL;
yueee_yt 0:7766f6712673 336 }
yueee_yt 0:7766f6712673 337
yueee_yt 0:7766f6712673 338
yueee_yt 0:7766f6712673 339 /*
yueee_yt 0:7766f6712673 340 * ChapProtocolReject - Peer doesn't grok CHAP.
yueee_yt 0:7766f6712673 341 */
yueee_yt 0:7766f6712673 342 static void
yueee_yt 0:7766f6712673 343 ChapProtocolReject(int unit)
yueee_yt 0:7766f6712673 344 {
yueee_yt 0:7766f6712673 345 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 346
yueee_yt 0:7766f6712673 347 if (cstate->serverstate != CHAPSS_INITIAL &&
yueee_yt 0:7766f6712673 348 cstate->serverstate != CHAPSS_CLOSED) {
yueee_yt 0:7766f6712673 349 auth_peer_fail(unit, PPP_CHAP);
yueee_yt 0:7766f6712673 350 }
yueee_yt 0:7766f6712673 351 if (cstate->clientstate != CHAPCS_INITIAL &&
yueee_yt 0:7766f6712673 352 cstate->clientstate != CHAPCS_CLOSED) {
yueee_yt 0:7766f6712673 353 auth_withpeer_fail(unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
yueee_yt 0:7766f6712673 354 }
yueee_yt 0:7766f6712673 355 ChapLowerDown(unit); /* shutdown chap */
yueee_yt 0:7766f6712673 356 }
yueee_yt 0:7766f6712673 357
yueee_yt 0:7766f6712673 358
yueee_yt 0:7766f6712673 359 /*
yueee_yt 0:7766f6712673 360 * ChapInput - Input CHAP packet.
yueee_yt 0:7766f6712673 361 */
yueee_yt 0:7766f6712673 362 static void
yueee_yt 0:7766f6712673 363 ChapInput(int unit, u_char *inpacket, int packet_len)
yueee_yt 0:7766f6712673 364 {
yueee_yt 0:7766f6712673 365 chap_state *cstate = &chap[unit];
yueee_yt 0:7766f6712673 366 u_char *inp;
yueee_yt 0:7766f6712673 367 u_char code, id;
yueee_yt 0:7766f6712673 368 int len;
yueee_yt 0:7766f6712673 369
yueee_yt 0:7766f6712673 370 /*
yueee_yt 0:7766f6712673 371 * Parse header (code, id and length).
yueee_yt 0:7766f6712673 372 * If packet too short, drop it.
yueee_yt 0:7766f6712673 373 */
yueee_yt 0:7766f6712673 374 inp = inpacket;
yueee_yt 0:7766f6712673 375 if (packet_len < CHAP_HEADERLEN) {
yueee_yt 0:7766f6712673 376 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short header.\n"));
yueee_yt 0:7766f6712673 377 return;
yueee_yt 0:7766f6712673 378 }
yueee_yt 0:7766f6712673 379 GETCHAR(code, inp);
yueee_yt 0:7766f6712673 380 GETCHAR(id, inp);
yueee_yt 0:7766f6712673 381 GETSHORT(len, inp);
yueee_yt 0:7766f6712673 382 if (len < CHAP_HEADERLEN) {
yueee_yt 0:7766f6712673 383 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd illegal length.\n"));
yueee_yt 0:7766f6712673 384 return;
yueee_yt 0:7766f6712673 385 }
yueee_yt 0:7766f6712673 386 if (len > packet_len) {
yueee_yt 0:7766f6712673 387 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short packet.\n"));
yueee_yt 0:7766f6712673 388 return;
yueee_yt 0:7766f6712673 389 }
yueee_yt 0:7766f6712673 390 len -= CHAP_HEADERLEN;
yueee_yt 0:7766f6712673 391
yueee_yt 0:7766f6712673 392 /*
yueee_yt 0:7766f6712673 393 * Action depends on code (as in fact it usually does :-).
yueee_yt 0:7766f6712673 394 */
yueee_yt 0:7766f6712673 395 switch (code) {
yueee_yt 0:7766f6712673 396 case CHAP_CHALLENGE:
yueee_yt 0:7766f6712673 397 ChapReceiveChallenge(cstate, inp, id, len);
yueee_yt 0:7766f6712673 398 break;
yueee_yt 0:7766f6712673 399
yueee_yt 0:7766f6712673 400 case CHAP_RESPONSE:
yueee_yt 0:7766f6712673 401 ChapReceiveResponse(cstate, inp, id, len);
yueee_yt 0:7766f6712673 402 break;
yueee_yt 0:7766f6712673 403
yueee_yt 0:7766f6712673 404 case CHAP_FAILURE:
yueee_yt 0:7766f6712673 405 ChapReceiveFailure(cstate, inp, id, len);
yueee_yt 0:7766f6712673 406 break;
yueee_yt 0:7766f6712673 407
yueee_yt 0:7766f6712673 408 case CHAP_SUCCESS:
yueee_yt 0:7766f6712673 409 ChapReceiveSuccess(cstate, inp, id, len);
yueee_yt 0:7766f6712673 410 break;
yueee_yt 0:7766f6712673 411
yueee_yt 0:7766f6712673 412 default: /* Need code reject? */
yueee_yt 0:7766f6712673 413 CHAPDEBUG(LOG_WARNING, ("Unknown CHAP code (%d) received.\n", code));
yueee_yt 0:7766f6712673 414 break;
yueee_yt 0:7766f6712673 415 }
yueee_yt 0:7766f6712673 416 }
yueee_yt 0:7766f6712673 417
yueee_yt 0:7766f6712673 418
yueee_yt 0:7766f6712673 419 /*
yueee_yt 0:7766f6712673 420 * ChapReceiveChallenge - Receive Challenge and send Response.
yueee_yt 0:7766f6712673 421 */
yueee_yt 0:7766f6712673 422 static void
yueee_yt 0:7766f6712673 423 ChapReceiveChallenge(chap_state *cstate, u_char *inp, u_char id, int len)
yueee_yt 0:7766f6712673 424 {
yueee_yt 0:7766f6712673 425 int rchallenge_len;
yueee_yt 0:7766f6712673 426 u_char *rchallenge;
yueee_yt 0:7766f6712673 427 int secret_len;
yueee_yt 0:7766f6712673 428 char secret[MAXSECRETLEN];
yueee_yt 0:7766f6712673 429 char rhostname[256];
yueee_yt 0:7766f6712673 430 MD5_CTX mdContext;
yueee_yt 0:7766f6712673 431 u_char hash[MD5_SIGNATURE_SIZE];
yueee_yt 0:7766f6712673 432
yueee_yt 0:7766f6712673 433 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: Rcvd id %d.\n", id));
yueee_yt 0:7766f6712673 434 if (cstate->clientstate == CHAPCS_CLOSED ||
yueee_yt 0:7766f6712673 435 cstate->clientstate == CHAPCS_PENDING) {
yueee_yt 0:7766f6712673 436 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: in state %d\n",
yueee_yt 0:7766f6712673 437 cstate->clientstate));
yueee_yt 0:7766f6712673 438 return;
yueee_yt 0:7766f6712673 439 }
yueee_yt 0:7766f6712673 440
yueee_yt 0:7766f6712673 441 if (len < 2) {
yueee_yt 0:7766f6712673 442 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
yueee_yt 0:7766f6712673 443 return;
yueee_yt 0:7766f6712673 444 }
yueee_yt 0:7766f6712673 445
yueee_yt 0:7766f6712673 446 GETCHAR(rchallenge_len, inp);
yueee_yt 0:7766f6712673 447 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
yueee_yt 0:7766f6712673 448 if (len < 0) {
yueee_yt 0:7766f6712673 449 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
yueee_yt 0:7766f6712673 450 return;
yueee_yt 0:7766f6712673 451 }
yueee_yt 0:7766f6712673 452 rchallenge = inp;
yueee_yt 0:7766f6712673 453 INCPTR(rchallenge_len, inp);
yueee_yt 0:7766f6712673 454
yueee_yt 0:7766f6712673 455 if (len >= (int)sizeof(rhostname)) {
yueee_yt 0:7766f6712673 456 len = sizeof(rhostname) - 1;
yueee_yt 0:7766f6712673 457 }
yueee_yt 0:7766f6712673 458 BCOPY(inp, rhostname, len);
yueee_yt 0:7766f6712673 459 rhostname[len] = '\000';
yueee_yt 0:7766f6712673 460
yueee_yt 0:7766f6712673 461 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: received name field '%s'\n",
yueee_yt 0:7766f6712673 462 rhostname));
yueee_yt 0:7766f6712673 463
yueee_yt 0:7766f6712673 464 /* Microsoft doesn't send their name back in the PPP packet */
yueee_yt 0:7766f6712673 465 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
yueee_yt 0:7766f6712673 466 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
yueee_yt 0:7766f6712673 467 rhostname[sizeof(rhostname) - 1] = 0;
yueee_yt 0:7766f6712673 468 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: using '%s' as remote name\n",
yueee_yt 0:7766f6712673 469 rhostname));
yueee_yt 0:7766f6712673 470 }
yueee_yt 0:7766f6712673 471
yueee_yt 0:7766f6712673 472 /* get secret for authenticating ourselves with the specified host */
yueee_yt 0:7766f6712673 473 if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
yueee_yt 0:7766f6712673 474 secret, &secret_len, 0)) {
yueee_yt 0:7766f6712673 475 secret_len = 0; /* assume null secret if can't find one */
yueee_yt 0:7766f6712673 476 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating us to %s\n",
yueee_yt 0:7766f6712673 477 rhostname));
yueee_yt 0:7766f6712673 478 }
yueee_yt 0:7766f6712673 479
yueee_yt 0:7766f6712673 480 /* cancel response send timeout if necessary */
yueee_yt 0:7766f6712673 481 if (cstate->clientstate == CHAPCS_RESPONSE) {
yueee_yt 0:7766f6712673 482 UNTIMEOUT(ChapResponseTimeout, cstate);
yueee_yt 0:7766f6712673 483 }
yueee_yt 0:7766f6712673 484
yueee_yt 0:7766f6712673 485 cstate->resp_id = id;
yueee_yt 0:7766f6712673 486 cstate->resp_transmits = 0;
yueee_yt 0:7766f6712673 487
yueee_yt 0:7766f6712673 488 /* generate MD based on negotiated type */
yueee_yt 0:7766f6712673 489 switch (cstate->resp_type) {
yueee_yt 0:7766f6712673 490
yueee_yt 0:7766f6712673 491 case CHAP_DIGEST_MD5:
yueee_yt 0:7766f6712673 492 MD5Init(&mdContext);
yueee_yt 0:7766f6712673 493 MD5Update(&mdContext, &cstate->resp_id, 1);
yueee_yt 0:7766f6712673 494 MD5Update(&mdContext, (u_char*)secret, secret_len);
yueee_yt 0:7766f6712673 495 MD5Update(&mdContext, rchallenge, rchallenge_len);
yueee_yt 0:7766f6712673 496 MD5Final(hash, &mdContext);
yueee_yt 0:7766f6712673 497 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
yueee_yt 0:7766f6712673 498 cstate->resp_length = MD5_SIGNATURE_SIZE;
yueee_yt 0:7766f6712673 499 break;
yueee_yt 0:7766f6712673 500
yueee_yt 0:7766f6712673 501 #if MSCHAP_SUPPORT
yueee_yt 0:7766f6712673 502 case CHAP_MICROSOFT:
yueee_yt 0:7766f6712673 503 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
yueee_yt 0:7766f6712673 504 break;
yueee_yt 0:7766f6712673 505 #endif
yueee_yt 0:7766f6712673 506
yueee_yt 0:7766f6712673 507 default:
yueee_yt 0:7766f6712673 508 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->resp_type));
yueee_yt 0:7766f6712673 509 return;
yueee_yt 0:7766f6712673 510 }
yueee_yt 0:7766f6712673 511
yueee_yt 0:7766f6712673 512 BZERO(secret, sizeof(secret));
yueee_yt 0:7766f6712673 513 ChapSendResponse(cstate);
yueee_yt 0:7766f6712673 514 }
yueee_yt 0:7766f6712673 515
yueee_yt 0:7766f6712673 516
yueee_yt 0:7766f6712673 517 /*
yueee_yt 0:7766f6712673 518 * ChapReceiveResponse - Receive and process response.
yueee_yt 0:7766f6712673 519 */
yueee_yt 0:7766f6712673 520 static void
yueee_yt 0:7766f6712673 521 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
yueee_yt 0:7766f6712673 522 {
yueee_yt 0:7766f6712673 523 u_char *remmd, remmd_len;
yueee_yt 0:7766f6712673 524 int secret_len, old_state;
yueee_yt 0:7766f6712673 525 int code;
yueee_yt 0:7766f6712673 526 char rhostname[256];
yueee_yt 0:7766f6712673 527 MD5_CTX mdContext;
yueee_yt 0:7766f6712673 528 char secret[MAXSECRETLEN];
yueee_yt 0:7766f6712673 529 u_char hash[MD5_SIGNATURE_SIZE];
yueee_yt 0:7766f6712673 530
yueee_yt 0:7766f6712673 531 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: Rcvd id %d.\n", id));
yueee_yt 0:7766f6712673 532
yueee_yt 0:7766f6712673 533 if (cstate->serverstate == CHAPSS_CLOSED ||
yueee_yt 0:7766f6712673 534 cstate->serverstate == CHAPSS_PENDING) {
yueee_yt 0:7766f6712673 535 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: in state %d\n",
yueee_yt 0:7766f6712673 536 cstate->serverstate));
yueee_yt 0:7766f6712673 537 return;
yueee_yt 0:7766f6712673 538 }
yueee_yt 0:7766f6712673 539
yueee_yt 0:7766f6712673 540 if (id != cstate->chal_id) {
yueee_yt 0:7766f6712673 541 return; /* doesn't match ID of last challenge */
yueee_yt 0:7766f6712673 542 }
yueee_yt 0:7766f6712673 543
yueee_yt 0:7766f6712673 544 /*
yueee_yt 0:7766f6712673 545 * If we have received a duplicate or bogus Response,
yueee_yt 0:7766f6712673 546 * we have to send the same answer (Success/Failure)
yueee_yt 0:7766f6712673 547 * as we did for the first Response we saw.
yueee_yt 0:7766f6712673 548 */
yueee_yt 0:7766f6712673 549 if (cstate->serverstate == CHAPSS_OPEN) {
yueee_yt 0:7766f6712673 550 ChapSendStatus(cstate, CHAP_SUCCESS);
yueee_yt 0:7766f6712673 551 return;
yueee_yt 0:7766f6712673 552 }
yueee_yt 0:7766f6712673 553 if (cstate->serverstate == CHAPSS_BADAUTH) {
yueee_yt 0:7766f6712673 554 ChapSendStatus(cstate, CHAP_FAILURE);
yueee_yt 0:7766f6712673 555 return;
yueee_yt 0:7766f6712673 556 }
yueee_yt 0:7766f6712673 557
yueee_yt 0:7766f6712673 558 if (len < 2) {
yueee_yt 0:7766f6712673 559 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
yueee_yt 0:7766f6712673 560 return;
yueee_yt 0:7766f6712673 561 }
yueee_yt 0:7766f6712673 562 GETCHAR(remmd_len, inp); /* get length of MD */
yueee_yt 0:7766f6712673 563 remmd = inp; /* get pointer to MD */
yueee_yt 0:7766f6712673 564 INCPTR(remmd_len, inp);
yueee_yt 0:7766f6712673 565
yueee_yt 0:7766f6712673 566 len -= sizeof (u_char) + remmd_len;
yueee_yt 0:7766f6712673 567 if (len < 0) {
yueee_yt 0:7766f6712673 568 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
yueee_yt 0:7766f6712673 569 return;
yueee_yt 0:7766f6712673 570 }
yueee_yt 0:7766f6712673 571
yueee_yt 0:7766f6712673 572 UNTIMEOUT(ChapChallengeTimeout, cstate);
yueee_yt 0:7766f6712673 573
yueee_yt 0:7766f6712673 574 if (len >= (int)sizeof(rhostname)) {
yueee_yt 0:7766f6712673 575 len = sizeof(rhostname) - 1;
yueee_yt 0:7766f6712673 576 }
yueee_yt 0:7766f6712673 577 BCOPY(inp, rhostname, len);
yueee_yt 0:7766f6712673 578 rhostname[len] = '\000';
yueee_yt 0:7766f6712673 579
yueee_yt 0:7766f6712673 580 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: received name field: %s\n",
yueee_yt 0:7766f6712673 581 rhostname));
yueee_yt 0:7766f6712673 582
yueee_yt 0:7766f6712673 583 /*
yueee_yt 0:7766f6712673 584 * Get secret for authenticating them with us,
yueee_yt 0:7766f6712673 585 * do the hash ourselves, and compare the result.
yueee_yt 0:7766f6712673 586 */
yueee_yt 0:7766f6712673 587 code = CHAP_FAILURE;
yueee_yt 0:7766f6712673 588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
yueee_yt 0:7766f6712673 589 secret, &secret_len, 1)) {
yueee_yt 0:7766f6712673 590 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating %s\n",
yueee_yt 0:7766f6712673 591 rhostname));
yueee_yt 0:7766f6712673 592 } else {
yueee_yt 0:7766f6712673 593 /* generate MD based on negotiated type */
yueee_yt 0:7766f6712673 594 switch (cstate->chal_type) {
yueee_yt 0:7766f6712673 595
yueee_yt 0:7766f6712673 596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
yueee_yt 0:7766f6712673 597 if (remmd_len != MD5_SIGNATURE_SIZE) {
yueee_yt 0:7766f6712673 598 break; /* it's not even the right length */
yueee_yt 0:7766f6712673 599 }
yueee_yt 0:7766f6712673 600 MD5Init(&mdContext);
yueee_yt 0:7766f6712673 601 MD5Update(&mdContext, &cstate->chal_id, 1);
yueee_yt 0:7766f6712673 602 MD5Update(&mdContext, (u_char*)secret, secret_len);
yueee_yt 0:7766f6712673 603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
yueee_yt 0:7766f6712673 604 MD5Final(hash, &mdContext);
yueee_yt 0:7766f6712673 605
yueee_yt 0:7766f6712673 606 /* compare local and remote MDs and send the appropriate status */
yueee_yt 0:7766f6712673 607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
yueee_yt 0:7766f6712673 608 code = CHAP_SUCCESS; /* they are the same! */
yueee_yt 0:7766f6712673 609 }
yueee_yt 0:7766f6712673 610 break;
yueee_yt 0:7766f6712673 611
yueee_yt 0:7766f6712673 612 default:
yueee_yt 0:7766f6712673 613 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->chal_type));
yueee_yt 0:7766f6712673 614 }
yueee_yt 0:7766f6712673 615 }
yueee_yt 0:7766f6712673 616
yueee_yt 0:7766f6712673 617 BZERO(secret, sizeof(secret));
yueee_yt 0:7766f6712673 618 ChapSendStatus(cstate, code);
yueee_yt 0:7766f6712673 619
yueee_yt 0:7766f6712673 620 if (code == CHAP_SUCCESS) {
yueee_yt 0:7766f6712673 621 old_state = cstate->serverstate;
yueee_yt 0:7766f6712673 622 cstate->serverstate = CHAPSS_OPEN;
yueee_yt 0:7766f6712673 623 if (old_state == CHAPSS_INITIAL_CHAL) {
yueee_yt 0:7766f6712673 624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
yueee_yt 0:7766f6712673 625 }
yueee_yt 0:7766f6712673 626 if (cstate->chal_interval != 0) {
yueee_yt 0:7766f6712673 627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
yueee_yt 0:7766f6712673 628 }
yueee_yt 0:7766f6712673 629 } else {
yueee_yt 0:7766f6712673 630 CHAPDEBUG(LOG_ERR, ("CHAP peer authentication failed\n"));
yueee_yt 0:7766f6712673 631 cstate->serverstate = CHAPSS_BADAUTH;
yueee_yt 0:7766f6712673 632 auth_peer_fail(cstate->unit, PPP_CHAP);
yueee_yt 0:7766f6712673 633 }
yueee_yt 0:7766f6712673 634 }
yueee_yt 0:7766f6712673 635
yueee_yt 0:7766f6712673 636 /*
yueee_yt 0:7766f6712673 637 * ChapReceiveSuccess - Receive Success
yueee_yt 0:7766f6712673 638 */
yueee_yt 0:7766f6712673 639 static void
yueee_yt 0:7766f6712673 640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
yueee_yt 0:7766f6712673 641 {
yueee_yt 0:7766f6712673 642 LWIP_UNUSED_ARG(id);
yueee_yt 0:7766f6712673 643 LWIP_UNUSED_ARG(inp);
yueee_yt 0:7766f6712673 644
yueee_yt 0:7766f6712673 645 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: Rcvd id %d.\n", id));
yueee_yt 0:7766f6712673 646
yueee_yt 0:7766f6712673 647 if (cstate->clientstate == CHAPCS_OPEN) {
yueee_yt 0:7766f6712673 648 /* presumably an answer to a duplicate response */
yueee_yt 0:7766f6712673 649 return;
yueee_yt 0:7766f6712673 650 }
yueee_yt 0:7766f6712673 651
yueee_yt 0:7766f6712673 652 if (cstate->clientstate != CHAPCS_RESPONSE) {
yueee_yt 0:7766f6712673 653 /* don't know what this is */
yueee_yt 0:7766f6712673 654 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: in state %d\n",
yueee_yt 0:7766f6712673 655 cstate->clientstate));
yueee_yt 0:7766f6712673 656 return;
yueee_yt 0:7766f6712673 657 }
yueee_yt 0:7766f6712673 658
yueee_yt 0:7766f6712673 659 UNTIMEOUT(ChapResponseTimeout, cstate);
yueee_yt 0:7766f6712673 660
yueee_yt 0:7766f6712673 661 /*
yueee_yt 0:7766f6712673 662 * Print message.
yueee_yt 0:7766f6712673 663 */
yueee_yt 0:7766f6712673 664 if (len > 0) {
yueee_yt 0:7766f6712673 665 PRINTMSG(inp, len);
yueee_yt 0:7766f6712673 666 }
yueee_yt 0:7766f6712673 667
yueee_yt 0:7766f6712673 668 cstate->clientstate = CHAPCS_OPEN;
yueee_yt 0:7766f6712673 669
yueee_yt 0:7766f6712673 670 auth_withpeer_success(cstate->unit, PPP_CHAP);
yueee_yt 0:7766f6712673 671 }
yueee_yt 0:7766f6712673 672
yueee_yt 0:7766f6712673 673
yueee_yt 0:7766f6712673 674 /*
yueee_yt 0:7766f6712673 675 * ChapReceiveFailure - Receive failure.
yueee_yt 0:7766f6712673 676 */
yueee_yt 0:7766f6712673 677 static void
yueee_yt 0:7766f6712673 678 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
yueee_yt 0:7766f6712673 679 {
yueee_yt 0:7766f6712673 680 LWIP_UNUSED_ARG(id);
yueee_yt 0:7766f6712673 681 LWIP_UNUSED_ARG(inp);
yueee_yt 0:7766f6712673 682
yueee_yt 0:7766f6712673 683 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: Rcvd id %d.\n", id));
yueee_yt 0:7766f6712673 684
yueee_yt 0:7766f6712673 685 if (cstate->clientstate != CHAPCS_RESPONSE) {
yueee_yt 0:7766f6712673 686 /* don't know what this is */
yueee_yt 0:7766f6712673 687 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: in state %d\n",
yueee_yt 0:7766f6712673 688 cstate->clientstate));
yueee_yt 0:7766f6712673 689 return;
yueee_yt 0:7766f6712673 690 }
yueee_yt 0:7766f6712673 691
yueee_yt 0:7766f6712673 692 UNTIMEOUT(ChapResponseTimeout, cstate);
yueee_yt 0:7766f6712673 693
yueee_yt 0:7766f6712673 694 /*
yueee_yt 0:7766f6712673 695 * Print message.
yueee_yt 0:7766f6712673 696 */
yueee_yt 0:7766f6712673 697 if (len > 0) {
yueee_yt 0:7766f6712673 698 PRINTMSG(inp, len);
yueee_yt 0:7766f6712673 699 }
yueee_yt 0:7766f6712673 700
yueee_yt 0:7766f6712673 701 CHAPDEBUG(LOG_ERR, ("CHAP authentication failed\n"));
yueee_yt 0:7766f6712673 702 auth_withpeer_fail(cstate->unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
yueee_yt 0:7766f6712673 703 }
yueee_yt 0:7766f6712673 704
yueee_yt 0:7766f6712673 705
yueee_yt 0:7766f6712673 706 /*
yueee_yt 0:7766f6712673 707 * ChapSendChallenge - Send an Authenticate challenge.
yueee_yt 0:7766f6712673 708 */
yueee_yt 0:7766f6712673 709 static void
yueee_yt 0:7766f6712673 710 ChapSendChallenge(chap_state *cstate)
yueee_yt 0:7766f6712673 711 {
yueee_yt 0:7766f6712673 712 u_char *outp;
yueee_yt 0:7766f6712673 713 int chal_len, name_len;
yueee_yt 0:7766f6712673 714 int outlen;
yueee_yt 0:7766f6712673 715
yueee_yt 0:7766f6712673 716 chal_len = cstate->chal_len;
yueee_yt 0:7766f6712673 717 name_len = (int)strlen(cstate->chal_name);
yueee_yt 0:7766f6712673 718 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
yueee_yt 0:7766f6712673 719 outp = outpacket_buf[cstate->unit];
yueee_yt 0:7766f6712673 720
yueee_yt 0:7766f6712673 721 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
yueee_yt 0:7766f6712673 722
yueee_yt 0:7766f6712673 723 PUTCHAR(CHAP_CHALLENGE, outp);
yueee_yt 0:7766f6712673 724 PUTCHAR(cstate->chal_id, outp);
yueee_yt 0:7766f6712673 725 PUTSHORT(outlen, outp);
yueee_yt 0:7766f6712673 726
yueee_yt 0:7766f6712673 727 PUTCHAR(chal_len, outp); /* put length of challenge */
yueee_yt 0:7766f6712673 728 BCOPY(cstate->challenge, outp, chal_len);
yueee_yt 0:7766f6712673 729 INCPTR(chal_len, outp);
yueee_yt 0:7766f6712673 730
yueee_yt 0:7766f6712673 731 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
yueee_yt 0:7766f6712673 732
yueee_yt 0:7766f6712673 733 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
yueee_yt 0:7766f6712673 734
yueee_yt 0:7766f6712673 735 CHAPDEBUG(LOG_INFO, ("ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
yueee_yt 0:7766f6712673 736
yueee_yt 0:7766f6712673 737 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
yueee_yt 0:7766f6712673 738 ++cstate->chal_transmits;
yueee_yt 0:7766f6712673 739 }
yueee_yt 0:7766f6712673 740
yueee_yt 0:7766f6712673 741
yueee_yt 0:7766f6712673 742 /*
yueee_yt 0:7766f6712673 743 * ChapSendStatus - Send a status response (ack or nak).
yueee_yt 0:7766f6712673 744 */
yueee_yt 0:7766f6712673 745 static void
yueee_yt 0:7766f6712673 746 ChapSendStatus(chap_state *cstate, int code)
yueee_yt 0:7766f6712673 747 {
yueee_yt 0:7766f6712673 748 u_char *outp;
yueee_yt 0:7766f6712673 749 int outlen, msglen;
yueee_yt 0:7766f6712673 750 char msg[256]; /* @todo: this can be a char*, no strcpy needed */
yueee_yt 0:7766f6712673 751
yueee_yt 0:7766f6712673 752 if (code == CHAP_SUCCESS) {
yueee_yt 0:7766f6712673 753 strcpy(msg, "Welcome!");
yueee_yt 0:7766f6712673 754 } else {
yueee_yt 0:7766f6712673 755 strcpy(msg, "I don't like you. Go 'way.");
yueee_yt 0:7766f6712673 756 }
yueee_yt 0:7766f6712673 757 msglen = (int)strlen(msg);
yueee_yt 0:7766f6712673 758
yueee_yt 0:7766f6712673 759 outlen = CHAP_HEADERLEN + msglen;
yueee_yt 0:7766f6712673 760 outp = outpacket_buf[cstate->unit];
yueee_yt 0:7766f6712673 761
yueee_yt 0:7766f6712673 762 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
yueee_yt 0:7766f6712673 763
yueee_yt 0:7766f6712673 764 PUTCHAR(code, outp);
yueee_yt 0:7766f6712673 765 PUTCHAR(cstate->chal_id, outp);
yueee_yt 0:7766f6712673 766 PUTSHORT(outlen, outp);
yueee_yt 0:7766f6712673 767 BCOPY(msg, outp, msglen);
yueee_yt 0:7766f6712673 768 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
yueee_yt 0:7766f6712673 769
yueee_yt 0:7766f6712673 770 CHAPDEBUG(LOG_INFO, ("ChapSendStatus: Sent code %d, id %d.\n", code,
yueee_yt 0:7766f6712673 771 cstate->chal_id));
yueee_yt 0:7766f6712673 772 }
yueee_yt 0:7766f6712673 773
yueee_yt 0:7766f6712673 774 /*
yueee_yt 0:7766f6712673 775 * ChapGenChallenge is used to generate a pseudo-random challenge string of
yueee_yt 0:7766f6712673 776 * a pseudo-random length between min_len and max_len. The challenge
yueee_yt 0:7766f6712673 777 * string and its length are stored in *cstate, and various other fields of
yueee_yt 0:7766f6712673 778 * *cstate are initialized.
yueee_yt 0:7766f6712673 779 */
yueee_yt 0:7766f6712673 780
yueee_yt 0:7766f6712673 781 static void
yueee_yt 0:7766f6712673 782 ChapGenChallenge(chap_state *cstate)
yueee_yt 0:7766f6712673 783 {
yueee_yt 0:7766f6712673 784 int chal_len;
yueee_yt 0:7766f6712673 785 u_char *ptr = cstate->challenge;
yueee_yt 0:7766f6712673 786 int i;
yueee_yt 0:7766f6712673 787
yueee_yt 0:7766f6712673 788 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
yueee_yt 0:7766f6712673 789 MAX_CHALLENGE_LENGTH */
yueee_yt 0:7766f6712673 790 chal_len = (unsigned)
yueee_yt 0:7766f6712673 791 ((((magic() >> 16) *
yueee_yt 0:7766f6712673 792 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
yueee_yt 0:7766f6712673 793 + MIN_CHALLENGE_LENGTH);
yueee_yt 0:7766f6712673 794 LWIP_ASSERT("chal_len <= 0xff", chal_len <= 0xffff);
yueee_yt 0:7766f6712673 795 cstate->chal_len = (u_char)chal_len;
yueee_yt 0:7766f6712673 796 cstate->chal_id = ++cstate->id;
yueee_yt 0:7766f6712673 797 cstate->chal_transmits = 0;
yueee_yt 0:7766f6712673 798
yueee_yt 0:7766f6712673 799 /* generate a random string */
yueee_yt 0:7766f6712673 800 for (i = 0; i < chal_len; i++ ) {
yueee_yt 0:7766f6712673 801 *ptr++ = (char) (magic() & 0xff);
yueee_yt 0:7766f6712673 802 }
yueee_yt 0:7766f6712673 803 }
yueee_yt 0:7766f6712673 804
yueee_yt 0:7766f6712673 805 /*
yueee_yt 0:7766f6712673 806 * ChapSendResponse - send a response packet with values as specified
yueee_yt 0:7766f6712673 807 * in *cstate.
yueee_yt 0:7766f6712673 808 */
yueee_yt 0:7766f6712673 809 /* ARGSUSED */
yueee_yt 0:7766f6712673 810 static void
yueee_yt 0:7766f6712673 811 ChapSendResponse(chap_state *cstate)
yueee_yt 0:7766f6712673 812 {
yueee_yt 0:7766f6712673 813 u_char *outp;
yueee_yt 0:7766f6712673 814 int outlen, md_len, name_len;
yueee_yt 0:7766f6712673 815
yueee_yt 0:7766f6712673 816 md_len = cstate->resp_length;
yueee_yt 0:7766f6712673 817 name_len = (int)strlen(cstate->resp_name);
yueee_yt 0:7766f6712673 818 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
yueee_yt 0:7766f6712673 819 outp = outpacket_buf[cstate->unit];
yueee_yt 0:7766f6712673 820
yueee_yt 0:7766f6712673 821 MAKEHEADER(outp, PPP_CHAP);
yueee_yt 0:7766f6712673 822
yueee_yt 0:7766f6712673 823 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
yueee_yt 0:7766f6712673 824 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
yueee_yt 0:7766f6712673 825 PUTSHORT(outlen, outp); /* packet length */
yueee_yt 0:7766f6712673 826
yueee_yt 0:7766f6712673 827 PUTCHAR(md_len, outp); /* length of MD */
yueee_yt 0:7766f6712673 828 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
yueee_yt 0:7766f6712673 829 INCPTR(md_len, outp);
yueee_yt 0:7766f6712673 830
yueee_yt 0:7766f6712673 831 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
yueee_yt 0:7766f6712673 832
yueee_yt 0:7766f6712673 833 /* send the packet */
yueee_yt 0:7766f6712673 834 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
yueee_yt 0:7766f6712673 835
yueee_yt 0:7766f6712673 836 cstate->clientstate = CHAPCS_RESPONSE;
yueee_yt 0:7766f6712673 837 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
yueee_yt 0:7766f6712673 838 ++cstate->resp_transmits;
yueee_yt 0:7766f6712673 839 }
yueee_yt 0:7766f6712673 840
yueee_yt 0:7766f6712673 841 #if PPP_ADDITIONAL_CALLBACKS
yueee_yt 0:7766f6712673 842 static char *ChapCodenames[] = {
yueee_yt 0:7766f6712673 843 "Challenge", "Response", "Success", "Failure"
yueee_yt 0:7766f6712673 844 };
yueee_yt 0:7766f6712673 845 /*
yueee_yt 0:7766f6712673 846 * ChapPrintPkt - print the contents of a CHAP packet.
yueee_yt 0:7766f6712673 847 */
yueee_yt 0:7766f6712673 848 static int
yueee_yt 0:7766f6712673 849 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
yueee_yt 0:7766f6712673 850 {
yueee_yt 0:7766f6712673 851 int code, id, len;
yueee_yt 0:7766f6712673 852 int clen, nlen;
yueee_yt 0:7766f6712673 853 u_char x;
yueee_yt 0:7766f6712673 854
yueee_yt 0:7766f6712673 855 if (plen < CHAP_HEADERLEN) {
yueee_yt 0:7766f6712673 856 return 0;
yueee_yt 0:7766f6712673 857 }
yueee_yt 0:7766f6712673 858 GETCHAR(code, p);
yueee_yt 0:7766f6712673 859 GETCHAR(id, p);
yueee_yt 0:7766f6712673 860 GETSHORT(len, p);
yueee_yt 0:7766f6712673 861 if (len < CHAP_HEADERLEN || len > plen) {
yueee_yt 0:7766f6712673 862 return 0;
yueee_yt 0:7766f6712673 863 }
yueee_yt 0:7766f6712673 864
yueee_yt 0:7766f6712673 865 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
yueee_yt 0:7766f6712673 866 printer(arg, " %s", ChapCodenames[code-1]);
yueee_yt 0:7766f6712673 867 } else {
yueee_yt 0:7766f6712673 868 printer(arg, " code=0x%x", code);
yueee_yt 0:7766f6712673 869 }
yueee_yt 0:7766f6712673 870 printer(arg, " id=0x%x", id);
yueee_yt 0:7766f6712673 871 len -= CHAP_HEADERLEN;
yueee_yt 0:7766f6712673 872 switch (code) {
yueee_yt 0:7766f6712673 873 case CHAP_CHALLENGE:
yueee_yt 0:7766f6712673 874 case CHAP_RESPONSE:
yueee_yt 0:7766f6712673 875 if (len < 1) {
yueee_yt 0:7766f6712673 876 break;
yueee_yt 0:7766f6712673 877 }
yueee_yt 0:7766f6712673 878 clen = p[0];
yueee_yt 0:7766f6712673 879 if (len < clen + 1) {
yueee_yt 0:7766f6712673 880 break;
yueee_yt 0:7766f6712673 881 }
yueee_yt 0:7766f6712673 882 ++p;
yueee_yt 0:7766f6712673 883 nlen = len - clen - 1;
yueee_yt 0:7766f6712673 884 printer(arg, " <");
yueee_yt 0:7766f6712673 885 for (; clen > 0; --clen) {
yueee_yt 0:7766f6712673 886 GETCHAR(x, p);
yueee_yt 0:7766f6712673 887 printer(arg, "%.2x", x);
yueee_yt 0:7766f6712673 888 }
yueee_yt 0:7766f6712673 889 printer(arg, ">, name = %.*Z", nlen, p);
yueee_yt 0:7766f6712673 890 break;
yueee_yt 0:7766f6712673 891 case CHAP_FAILURE:
yueee_yt 0:7766f6712673 892 case CHAP_SUCCESS:
yueee_yt 0:7766f6712673 893 printer(arg, " %.*Z", len, p);
yueee_yt 0:7766f6712673 894 break;
yueee_yt 0:7766f6712673 895 default:
yueee_yt 0:7766f6712673 896 for (clen = len; clen > 0; --clen) {
yueee_yt 0:7766f6712673 897 GETCHAR(x, p);
yueee_yt 0:7766f6712673 898 printer(arg, " %.2x", x);
yueee_yt 0:7766f6712673 899 }
yueee_yt 0:7766f6712673 900 }
yueee_yt 0:7766f6712673 901
yueee_yt 0:7766f6712673 902 return len + CHAP_HEADERLEN;
yueee_yt 0:7766f6712673 903 }
yueee_yt 0:7766f6712673 904 #endif /* PPP_ADDITIONAL_CALLBACKS */
yueee_yt 0:7766f6712673 905
yueee_yt 0:7766f6712673 906 #endif /* CHAP_SUPPORT */
yueee_yt 0:7766f6712673 907
yueee_yt 0:7766f6712673 908 #endif /* PPP_SUPPORT */