孙 毅明 / Mbed 2 deprecated 123

创建mbed

Dependencies:   EthernetInterface SDFileSystem mbed-rtos mbed

EthernetInterface/lwip/netif/ppp/chap.c@1:6465a3f5c58a, 2018-03-06 (annotated)

Committer:
sunyiming
Date:
Tue Mar 06 08:53:46 2018 +0000
Revision:
1:6465a3f5c58a
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
sunyiming 1:6465a3f5c58a 1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
sunyiming 1:6465a3f5c58a 2 /*****************************************************************************
sunyiming 1:6465a3f5c58a 3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
sunyiming 1:6465a3f5c58a 4 *
sunyiming 1:6465a3f5c58a 5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
sunyiming 1:6465a3f5c58a 6 * portions Copyright (c) 1997 by Global Election Systems Inc.
sunyiming 1:6465a3f5c58a 7 *
sunyiming 1:6465a3f5c58a 8 * The authors hereby grant permission to use, copy, modify, distribute,
sunyiming 1:6465a3f5c58a 9 * and license this software and its documentation for any purpose, provided
sunyiming 1:6465a3f5c58a 10 * that existing copyright notices are retained in all copies and that this
sunyiming 1:6465a3f5c58a 11 * notice and the following disclaimer are included verbatim in any
sunyiming 1:6465a3f5c58a 12 * distributions. No written agreement, license, or royalty fee is required
sunyiming 1:6465a3f5c58a 13 * for any of the authorized uses.
sunyiming 1:6465a3f5c58a 14 *
sunyiming 1:6465a3f5c58a 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
sunyiming 1:6465a3f5c58a 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
sunyiming 1:6465a3f5c58a 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
sunyiming 1:6465a3f5c58a 18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
sunyiming 1:6465a3f5c58a 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sunyiming 1:6465a3f5c58a 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
sunyiming 1:6465a3f5c58a 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
sunyiming 1:6465a3f5c58a 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
sunyiming 1:6465a3f5c58a 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
sunyiming 1:6465a3f5c58a 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
sunyiming 1:6465a3f5c58a 25 *
sunyiming 1:6465a3f5c58a 26 ******************************************************************************
sunyiming 1:6465a3f5c58a 27 * REVISION HISTORY
sunyiming 1:6465a3f5c58a 28 *
sunyiming 1:6465a3f5c58a 29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
sunyiming 1:6465a3f5c58a 30 * Ported to lwIP.
sunyiming 1:6465a3f5c58a 31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
sunyiming 1:6465a3f5c58a 32 * Original based on BSD chap.c.
sunyiming 1:6465a3f5c58a 33 *****************************************************************************/
sunyiming 1:6465a3f5c58a 34 /*
sunyiming 1:6465a3f5c58a 35 * chap.c - Challenge Handshake Authentication Protocol.
sunyiming 1:6465a3f5c58a 36 *
sunyiming 1:6465a3f5c58a 37 * Copyright (c) 1993 The Australian National University.
sunyiming 1:6465a3f5c58a 38 * All rights reserved.
sunyiming 1:6465a3f5c58a 39 *
sunyiming 1:6465a3f5c58a 40 * Redistribution and use in source and binary forms are permitted
sunyiming 1:6465a3f5c58a 41 * provided that the above copyright notice and this paragraph are
sunyiming 1:6465a3f5c58a 42 * duplicated in all such forms and that any documentation,
sunyiming 1:6465a3f5c58a 43 * advertising materials, and other materials related to such
sunyiming 1:6465a3f5c58a 44 * distribution and use acknowledge that the software was developed
sunyiming 1:6465a3f5c58a 45 * by the Australian National University. The name of the University
sunyiming 1:6465a3f5c58a 46 * may not be used to endorse or promote products derived from this
sunyiming 1:6465a3f5c58a 47 * software without specific prior written permission.
sunyiming 1:6465a3f5c58a 48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
sunyiming 1:6465a3f5c58a 49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
sunyiming 1:6465a3f5c58a 50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
sunyiming 1:6465a3f5c58a 51 *
sunyiming 1:6465a3f5c58a 52 * Copyright (c) 1991 Gregory M. Christy.
sunyiming 1:6465a3f5c58a 53 * All rights reserved.
sunyiming 1:6465a3f5c58a 54 *
sunyiming 1:6465a3f5c58a 55 * Redistribution and use in source and binary forms are permitted
sunyiming 1:6465a3f5c58a 56 * provided that the above copyright notice and this paragraph are
sunyiming 1:6465a3f5c58a 57 * duplicated in all such forms and that any documentation,
sunyiming 1:6465a3f5c58a 58 * advertising materials, and other materials related to such
sunyiming 1:6465a3f5c58a 59 * distribution and use acknowledge that the software was developed
sunyiming 1:6465a3f5c58a 60 * by Gregory M. Christy. The name of the author may not be used to
sunyiming 1:6465a3f5c58a 61 * endorse or promote products derived from this software without
sunyiming 1:6465a3f5c58a 62 * specific prior written permission.
sunyiming 1:6465a3f5c58a 63 *
sunyiming 1:6465a3f5c58a 64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
sunyiming 1:6465a3f5c58a 65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
sunyiming 1:6465a3f5c58a 66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
sunyiming 1:6465a3f5c58a 67 */
sunyiming 1:6465a3f5c58a 68
sunyiming 1:6465a3f5c58a 69 #include "lwip/opt.h"
sunyiming 1:6465a3f5c58a 70
sunyiming 1:6465a3f5c58a 71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
sunyiming 1:6465a3f5c58a 72
sunyiming 1:6465a3f5c58a 73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
sunyiming 1:6465a3f5c58a 74
sunyiming 1:6465a3f5c58a 75 #include "ppp.h"
sunyiming 1:6465a3f5c58a 76 #include "pppdebug.h"
sunyiming 1:6465a3f5c58a 77
sunyiming 1:6465a3f5c58a 78 #include "magic.h"
sunyiming 1:6465a3f5c58a 79 #include "randm.h"
sunyiming 1:6465a3f5c58a 80 #include "auth.h"
sunyiming 1:6465a3f5c58a 81 #include "md5.h"
sunyiming 1:6465a3f5c58a 82 #include "chap.h"
sunyiming 1:6465a3f5c58a 83 #include "chpms.h"
sunyiming 1:6465a3f5c58a 84
sunyiming 1:6465a3f5c58a 85 #include <string.h>
sunyiming 1:6465a3f5c58a 86
sunyiming 1:6465a3f5c58a 87 #if 0 /* UNUSED */
sunyiming 1:6465a3f5c58a 88 /*
sunyiming 1:6465a3f5c58a 89 * Command-line options.
sunyiming 1:6465a3f5c58a 90 */
sunyiming 1:6465a3f5c58a 91 static option_t chap_option_list[] = {
sunyiming 1:6465a3f5c58a 92 { "chap-restart", o_int, &chap[0].timeouttime,
sunyiming 1:6465a3f5c58a 93 "Set timeout for CHAP" },
sunyiming 1:6465a3f5c58a 94 { "chap-max-challenge", o_int, &chap[0].max_transmits,
sunyiming 1:6465a3f5c58a 95 "Set max #xmits for challenge" },
sunyiming 1:6465a3f5c58a 96 { "chap-interval", o_int, &chap[0].chal_interval,
sunyiming 1:6465a3f5c58a 97 "Set interval for rechallenge" },
sunyiming 1:6465a3f5c58a 98 #ifdef MSLANMAN
sunyiming 1:6465a3f5c58a 99 { "ms-lanman", o_bool, &ms_lanman,
sunyiming 1:6465a3f5c58a 100 "Use LanMan passwd when using MS-CHAP", 1 },
sunyiming 1:6465a3f5c58a 101 #endif
sunyiming 1:6465a3f5c58a 102 { NULL }
sunyiming 1:6465a3f5c58a 103 };
sunyiming 1:6465a3f5c58a 104 #endif /* UNUSED */
sunyiming 1:6465a3f5c58a 105
sunyiming 1:6465a3f5c58a 106 /*
sunyiming 1:6465a3f5c58a 107 * Protocol entry points.
sunyiming 1:6465a3f5c58a 108 */
sunyiming 1:6465a3f5c58a 109 static void ChapInit (int);
sunyiming 1:6465a3f5c58a 110 static void ChapLowerUp (int);
sunyiming 1:6465a3f5c58a 111 static void ChapLowerDown (int);
sunyiming 1:6465a3f5c58a 112 static void ChapInput (int, u_char *, int);
sunyiming 1:6465a3f5c58a 113 static void ChapProtocolReject (int);
sunyiming 1:6465a3f5c58a 114 #if PPP_ADDITIONAL_CALLBACKS
sunyiming 1:6465a3f5c58a 115 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
sunyiming 1:6465a3f5c58a 116 #endif
sunyiming 1:6465a3f5c58a 117
sunyiming 1:6465a3f5c58a 118 struct protent chap_protent = {
sunyiming 1:6465a3f5c58a 119 PPP_CHAP,
sunyiming 1:6465a3f5c58a 120 ChapInit,
sunyiming 1:6465a3f5c58a 121 ChapInput,
sunyiming 1:6465a3f5c58a 122 ChapProtocolReject,
sunyiming 1:6465a3f5c58a 123 ChapLowerUp,
sunyiming 1:6465a3f5c58a 124 ChapLowerDown,
sunyiming 1:6465a3f5c58a 125 NULL,
sunyiming 1:6465a3f5c58a 126 NULL,
sunyiming 1:6465a3f5c58a 127 #if PPP_ADDITIONAL_CALLBACKS
sunyiming 1:6465a3f5c58a 128 ChapPrintPkt,
sunyiming 1:6465a3f5c58a 129 NULL,
sunyiming 1:6465a3f5c58a 130 #endif /* PPP_ADDITIONAL_CALLBACKS */
sunyiming 1:6465a3f5c58a 131 1,
sunyiming 1:6465a3f5c58a 132 "CHAP",
sunyiming 1:6465a3f5c58a 133 #if PPP_ADDITIONAL_CALLBACKS
sunyiming 1:6465a3f5c58a 134 NULL,
sunyiming 1:6465a3f5c58a 135 NULL,
sunyiming 1:6465a3f5c58a 136 NULL
sunyiming 1:6465a3f5c58a 137 #endif /* PPP_ADDITIONAL_CALLBACKS */
sunyiming 1:6465a3f5c58a 138 };
sunyiming 1:6465a3f5c58a 139
sunyiming 1:6465a3f5c58a 140 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
sunyiming 1:6465a3f5c58a 141
sunyiming 1:6465a3f5c58a 142 static void ChapChallengeTimeout (void *);
sunyiming 1:6465a3f5c58a 143 static void ChapResponseTimeout (void *);
sunyiming 1:6465a3f5c58a 144 static void ChapReceiveChallenge (chap_state *, u_char *, u_char, int);
sunyiming 1:6465a3f5c58a 145 static void ChapRechallenge (void *);
sunyiming 1:6465a3f5c58a 146 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
sunyiming 1:6465a3f5c58a 147 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
sunyiming 1:6465a3f5c58a 148 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
sunyiming 1:6465a3f5c58a 149 static void ChapSendStatus (chap_state *, int);
sunyiming 1:6465a3f5c58a 150 static void ChapSendChallenge (chap_state *);
sunyiming 1:6465a3f5c58a 151 static void ChapSendResponse (chap_state *);
sunyiming 1:6465a3f5c58a 152 static void ChapGenChallenge (chap_state *);
sunyiming 1:6465a3f5c58a 153
sunyiming 1:6465a3f5c58a 154 /*
sunyiming 1:6465a3f5c58a 155 * ChapInit - Initialize a CHAP unit.
sunyiming 1:6465a3f5c58a 156 */
sunyiming 1:6465a3f5c58a 157 static void
sunyiming 1:6465a3f5c58a 158 ChapInit(int unit)
sunyiming 1:6465a3f5c58a 159 {
sunyiming 1:6465a3f5c58a 160 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 161
sunyiming 1:6465a3f5c58a 162 BZERO(cstate, sizeof(*cstate));
sunyiming 1:6465a3f5c58a 163 cstate->unit = unit;
sunyiming 1:6465a3f5c58a 164 cstate->clientstate = CHAPCS_INITIAL;
sunyiming 1:6465a3f5c58a 165 cstate->serverstate = CHAPSS_INITIAL;
sunyiming 1:6465a3f5c58a 166 cstate->timeouttime = CHAP_DEFTIMEOUT;
sunyiming 1:6465a3f5c58a 167 cstate->max_transmits = CHAP_DEFTRANSMITS;
sunyiming 1:6465a3f5c58a 168 /* random number generator is initialized in magic_init */
sunyiming 1:6465a3f5c58a 169 }
sunyiming 1:6465a3f5c58a 170
sunyiming 1:6465a3f5c58a 171
sunyiming 1:6465a3f5c58a 172 /*
sunyiming 1:6465a3f5c58a 173 * ChapAuthWithPeer - Authenticate us with our peer (start client).
sunyiming 1:6465a3f5c58a 174 *
sunyiming 1:6465a3f5c58a 175 */
sunyiming 1:6465a3f5c58a 176 void
sunyiming 1:6465a3f5c58a 177 ChapAuthWithPeer(int unit, char *our_name, u_char digest)
sunyiming 1:6465a3f5c58a 178 {
sunyiming 1:6465a3f5c58a 179 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 180
sunyiming 1:6465a3f5c58a 181 cstate->resp_name = our_name;
sunyiming 1:6465a3f5c58a 182 cstate->resp_type = digest;
sunyiming 1:6465a3f5c58a 183
sunyiming 1:6465a3f5c58a 184 if (cstate->clientstate == CHAPCS_INITIAL ||
sunyiming 1:6465a3f5c58a 185 cstate->clientstate == CHAPCS_PENDING) {
sunyiming 1:6465a3f5c58a 186 /* lower layer isn't up - wait until later */
sunyiming 1:6465a3f5c58a 187 cstate->clientstate = CHAPCS_PENDING;
sunyiming 1:6465a3f5c58a 188 return;
sunyiming 1:6465a3f5c58a 189 }
sunyiming 1:6465a3f5c58a 190
sunyiming 1:6465a3f5c58a 191 /*
sunyiming 1:6465a3f5c58a 192 * We get here as a result of LCP coming up.
sunyiming 1:6465a3f5c58a 193 * So even if CHAP was open before, we will
sunyiming 1:6465a3f5c58a 194 * have to re-authenticate ourselves.
sunyiming 1:6465a3f5c58a 195 */
sunyiming 1:6465a3f5c58a 196 cstate->clientstate = CHAPCS_LISTEN;
sunyiming 1:6465a3f5c58a 197 }
sunyiming 1:6465a3f5c58a 198
sunyiming 1:6465a3f5c58a 199
sunyiming 1:6465a3f5c58a 200 /*
sunyiming 1:6465a3f5c58a 201 * ChapAuthPeer - Authenticate our peer (start server).
sunyiming 1:6465a3f5c58a 202 */
sunyiming 1:6465a3f5c58a 203 void
sunyiming 1:6465a3f5c58a 204 ChapAuthPeer(int unit, char *our_name, u_char digest)
sunyiming 1:6465a3f5c58a 205 {
sunyiming 1:6465a3f5c58a 206 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 207
sunyiming 1:6465a3f5c58a 208 cstate->chal_name = our_name;
sunyiming 1:6465a3f5c58a 209 cstate->chal_type = digest;
sunyiming 1:6465a3f5c58a 210
sunyiming 1:6465a3f5c58a 211 if (cstate->serverstate == CHAPSS_INITIAL ||
sunyiming 1:6465a3f5c58a 212 cstate->serverstate == CHAPSS_PENDING) {
sunyiming 1:6465a3f5c58a 213 /* lower layer isn't up - wait until later */
sunyiming 1:6465a3f5c58a 214 cstate->serverstate = CHAPSS_PENDING;
sunyiming 1:6465a3f5c58a 215 return;
sunyiming 1:6465a3f5c58a 216 }
sunyiming 1:6465a3f5c58a 217
sunyiming 1:6465a3f5c58a 218 ChapGenChallenge(cstate);
sunyiming 1:6465a3f5c58a 219 ChapSendChallenge(cstate); /* crank it up dude! */
sunyiming 1:6465a3f5c58a 220 cstate->serverstate = CHAPSS_INITIAL_CHAL;
sunyiming 1:6465a3f5c58a 221 }
sunyiming 1:6465a3f5c58a 222
sunyiming 1:6465a3f5c58a 223
sunyiming 1:6465a3f5c58a 224 /*
sunyiming 1:6465a3f5c58a 225 * ChapChallengeTimeout - Timeout expired on sending challenge.
sunyiming 1:6465a3f5c58a 226 */
sunyiming 1:6465a3f5c58a 227 static void
sunyiming 1:6465a3f5c58a 228 ChapChallengeTimeout(void *arg)
sunyiming 1:6465a3f5c58a 229 {
sunyiming 1:6465a3f5c58a 230 chap_state *cstate = (chap_state *) arg;
sunyiming 1:6465a3f5c58a 231
sunyiming 1:6465a3f5c58a 232 /* if we aren't sending challenges, don't worry. then again we */
sunyiming 1:6465a3f5c58a 233 /* probably shouldn't be here either */
sunyiming 1:6465a3f5c58a 234 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
sunyiming 1:6465a3f5c58a 235 cstate->serverstate != CHAPSS_RECHALLENGE) {
sunyiming 1:6465a3f5c58a 236 return;
sunyiming 1:6465a3f5c58a 237 }
sunyiming 1:6465a3f5c58a 238
sunyiming 1:6465a3f5c58a 239 if (cstate->chal_transmits >= cstate->max_transmits) {
sunyiming 1:6465a3f5c58a 240 /* give up on peer */
sunyiming 1:6465a3f5c58a 241 CHAPDEBUG(LOG_ERR, ("Peer failed to respond to CHAP challenge\n"));
sunyiming 1:6465a3f5c58a 242 cstate->serverstate = CHAPSS_BADAUTH;
sunyiming 1:6465a3f5c58a 243 auth_peer_fail(cstate->unit, PPP_CHAP);
sunyiming 1:6465a3f5c58a 244 return;
sunyiming 1:6465a3f5c58a 245 }
sunyiming 1:6465a3f5c58a 246
sunyiming 1:6465a3f5c58a 247 ChapSendChallenge(cstate); /* Re-send challenge */
sunyiming 1:6465a3f5c58a 248 }
sunyiming 1:6465a3f5c58a 249
sunyiming 1:6465a3f5c58a 250
sunyiming 1:6465a3f5c58a 251 /*
sunyiming 1:6465a3f5c58a 252 * ChapResponseTimeout - Timeout expired on sending response.
sunyiming 1:6465a3f5c58a 253 */
sunyiming 1:6465a3f5c58a 254 static void
sunyiming 1:6465a3f5c58a 255 ChapResponseTimeout(void *arg)
sunyiming 1:6465a3f5c58a 256 {
sunyiming 1:6465a3f5c58a 257 chap_state *cstate = (chap_state *) arg;
sunyiming 1:6465a3f5c58a 258
sunyiming 1:6465a3f5c58a 259 /* if we aren't sending a response, don't worry. */
sunyiming 1:6465a3f5c58a 260 if (cstate->clientstate != CHAPCS_RESPONSE) {
sunyiming 1:6465a3f5c58a 261 return;
sunyiming 1:6465a3f5c58a 262 }
sunyiming 1:6465a3f5c58a 263
sunyiming 1:6465a3f5c58a 264 ChapSendResponse(cstate); /* re-send response */
sunyiming 1:6465a3f5c58a 265 }
sunyiming 1:6465a3f5c58a 266
sunyiming 1:6465a3f5c58a 267
sunyiming 1:6465a3f5c58a 268 /*
sunyiming 1:6465a3f5c58a 269 * ChapRechallenge - Time to challenge the peer again.
sunyiming 1:6465a3f5c58a 270 */
sunyiming 1:6465a3f5c58a 271 static void
sunyiming 1:6465a3f5c58a 272 ChapRechallenge(void *arg)
sunyiming 1:6465a3f5c58a 273 {
sunyiming 1:6465a3f5c58a 274 chap_state *cstate = (chap_state *) arg;
sunyiming 1:6465a3f5c58a 275
sunyiming 1:6465a3f5c58a 276 /* if we aren't sending a response, don't worry. */
sunyiming 1:6465a3f5c58a 277 if (cstate->serverstate != CHAPSS_OPEN) {
sunyiming 1:6465a3f5c58a 278 return;
sunyiming 1:6465a3f5c58a 279 }
sunyiming 1:6465a3f5c58a 280
sunyiming 1:6465a3f5c58a 281 ChapGenChallenge(cstate);
sunyiming 1:6465a3f5c58a 282 ChapSendChallenge(cstate);
sunyiming 1:6465a3f5c58a 283 cstate->serverstate = CHAPSS_RECHALLENGE;
sunyiming 1:6465a3f5c58a 284 }
sunyiming 1:6465a3f5c58a 285
sunyiming 1:6465a3f5c58a 286
sunyiming 1:6465a3f5c58a 287 /*
sunyiming 1:6465a3f5c58a 288 * ChapLowerUp - The lower layer is up.
sunyiming 1:6465a3f5c58a 289 *
sunyiming 1:6465a3f5c58a 290 * Start up if we have pending requests.
sunyiming 1:6465a3f5c58a 291 */
sunyiming 1:6465a3f5c58a 292 static void
sunyiming 1:6465a3f5c58a 293 ChapLowerUp(int unit)
sunyiming 1:6465a3f5c58a 294 {
sunyiming 1:6465a3f5c58a 295 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 296
sunyiming 1:6465a3f5c58a 297 if (cstate->clientstate == CHAPCS_INITIAL) {
sunyiming 1:6465a3f5c58a 298 cstate->clientstate = CHAPCS_CLOSED;
sunyiming 1:6465a3f5c58a 299 } else if (cstate->clientstate == CHAPCS_PENDING) {
sunyiming 1:6465a3f5c58a 300 cstate->clientstate = CHAPCS_LISTEN;
sunyiming 1:6465a3f5c58a 301 }
sunyiming 1:6465a3f5c58a 302
sunyiming 1:6465a3f5c58a 303 if (cstate->serverstate == CHAPSS_INITIAL) {
sunyiming 1:6465a3f5c58a 304 cstate->serverstate = CHAPSS_CLOSED;
sunyiming 1:6465a3f5c58a 305 } else if (cstate->serverstate == CHAPSS_PENDING) {
sunyiming 1:6465a3f5c58a 306 ChapGenChallenge(cstate);
sunyiming 1:6465a3f5c58a 307 ChapSendChallenge(cstate);
sunyiming 1:6465a3f5c58a 308 cstate->serverstate = CHAPSS_INITIAL_CHAL;
sunyiming 1:6465a3f5c58a 309 }
sunyiming 1:6465a3f5c58a 310 }
sunyiming 1:6465a3f5c58a 311
sunyiming 1:6465a3f5c58a 312
sunyiming 1:6465a3f5c58a 313 /*
sunyiming 1:6465a3f5c58a 314 * ChapLowerDown - The lower layer is down.
sunyiming 1:6465a3f5c58a 315 *
sunyiming 1:6465a3f5c58a 316 * Cancel all timeouts.
sunyiming 1:6465a3f5c58a 317 */
sunyiming 1:6465a3f5c58a 318 static void
sunyiming 1:6465a3f5c58a 319 ChapLowerDown(int unit)
sunyiming 1:6465a3f5c58a 320 {
sunyiming 1:6465a3f5c58a 321 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 322
sunyiming 1:6465a3f5c58a 323 /* Timeout(s) pending? Cancel if so. */
sunyiming 1:6465a3f5c58a 324 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
sunyiming 1:6465a3f5c58a 325 cstate->serverstate == CHAPSS_RECHALLENGE) {
sunyiming 1:6465a3f5c58a 326 UNTIMEOUT(ChapChallengeTimeout, cstate);
sunyiming 1:6465a3f5c58a 327 } else if (cstate->serverstate == CHAPSS_OPEN
sunyiming 1:6465a3f5c58a 328 && cstate->chal_interval != 0) {
sunyiming 1:6465a3f5c58a 329 UNTIMEOUT(ChapRechallenge, cstate);
sunyiming 1:6465a3f5c58a 330 }
sunyiming 1:6465a3f5c58a 331 if (cstate->clientstate == CHAPCS_RESPONSE) {
sunyiming 1:6465a3f5c58a 332 UNTIMEOUT(ChapResponseTimeout, cstate);
sunyiming 1:6465a3f5c58a 333 }
sunyiming 1:6465a3f5c58a 334 cstate->clientstate = CHAPCS_INITIAL;
sunyiming 1:6465a3f5c58a 335 cstate->serverstate = CHAPSS_INITIAL;
sunyiming 1:6465a3f5c58a 336 }
sunyiming 1:6465a3f5c58a 337
sunyiming 1:6465a3f5c58a 338
sunyiming 1:6465a3f5c58a 339 /*
sunyiming 1:6465a3f5c58a 340 * ChapProtocolReject - Peer doesn't grok CHAP.
sunyiming 1:6465a3f5c58a 341 */
sunyiming 1:6465a3f5c58a 342 static void
sunyiming 1:6465a3f5c58a 343 ChapProtocolReject(int unit)
sunyiming 1:6465a3f5c58a 344 {
sunyiming 1:6465a3f5c58a 345 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 346
sunyiming 1:6465a3f5c58a 347 if (cstate->serverstate != CHAPSS_INITIAL &&
sunyiming 1:6465a3f5c58a 348 cstate->serverstate != CHAPSS_CLOSED) {
sunyiming 1:6465a3f5c58a 349 auth_peer_fail(unit, PPP_CHAP);
sunyiming 1:6465a3f5c58a 350 }
sunyiming 1:6465a3f5c58a 351 if (cstate->clientstate != CHAPCS_INITIAL &&
sunyiming 1:6465a3f5c58a 352 cstate->clientstate != CHAPCS_CLOSED) {
sunyiming 1:6465a3f5c58a 353 auth_withpeer_fail(unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
sunyiming 1:6465a3f5c58a 354 }
sunyiming 1:6465a3f5c58a 355 ChapLowerDown(unit); /* shutdown chap */
sunyiming 1:6465a3f5c58a 356 }
sunyiming 1:6465a3f5c58a 357
sunyiming 1:6465a3f5c58a 358
sunyiming 1:6465a3f5c58a 359 /*
sunyiming 1:6465a3f5c58a 360 * ChapInput - Input CHAP packet.
sunyiming 1:6465a3f5c58a 361 */
sunyiming 1:6465a3f5c58a 362 static void
sunyiming 1:6465a3f5c58a 363 ChapInput(int unit, u_char *inpacket, int packet_len)
sunyiming 1:6465a3f5c58a 364 {
sunyiming 1:6465a3f5c58a 365 chap_state *cstate = &chap[unit];
sunyiming 1:6465a3f5c58a 366 u_char *inp;
sunyiming 1:6465a3f5c58a 367 u_char code, id;
sunyiming 1:6465a3f5c58a 368 int len;
sunyiming 1:6465a3f5c58a 369
sunyiming 1:6465a3f5c58a 370 /*
sunyiming 1:6465a3f5c58a 371 * Parse header (code, id and length).
sunyiming 1:6465a3f5c58a 372 * If packet too short, drop it.
sunyiming 1:6465a3f5c58a 373 */
sunyiming 1:6465a3f5c58a 374 inp = inpacket;
sunyiming 1:6465a3f5c58a 375 if (packet_len < CHAP_HEADERLEN) {
sunyiming 1:6465a3f5c58a 376 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short header.\n"));
sunyiming 1:6465a3f5c58a 377 return;
sunyiming 1:6465a3f5c58a 378 }
sunyiming 1:6465a3f5c58a 379 GETCHAR(code, inp);
sunyiming 1:6465a3f5c58a 380 GETCHAR(id, inp);
sunyiming 1:6465a3f5c58a 381 GETSHORT(len, inp);
sunyiming 1:6465a3f5c58a 382 if (len < CHAP_HEADERLEN) {
sunyiming 1:6465a3f5c58a 383 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd illegal length.\n"));
sunyiming 1:6465a3f5c58a 384 return;
sunyiming 1:6465a3f5c58a 385 }
sunyiming 1:6465a3f5c58a 386 if (len > packet_len) {
sunyiming 1:6465a3f5c58a 387 CHAPDEBUG(LOG_INFO, ("ChapInput: rcvd short packet.\n"));
sunyiming 1:6465a3f5c58a 388 return;
sunyiming 1:6465a3f5c58a 389 }
sunyiming 1:6465a3f5c58a 390 len -= CHAP_HEADERLEN;
sunyiming 1:6465a3f5c58a 391
sunyiming 1:6465a3f5c58a 392 /*
sunyiming 1:6465a3f5c58a 393 * Action depends on code (as in fact it usually does :-).
sunyiming 1:6465a3f5c58a 394 */
sunyiming 1:6465a3f5c58a 395 switch (code) {
sunyiming 1:6465a3f5c58a 396 case CHAP_CHALLENGE:
sunyiming 1:6465a3f5c58a 397 ChapReceiveChallenge(cstate, inp, id, len);
sunyiming 1:6465a3f5c58a 398 break;
sunyiming 1:6465a3f5c58a 399
sunyiming 1:6465a3f5c58a 400 case CHAP_RESPONSE:
sunyiming 1:6465a3f5c58a 401 ChapReceiveResponse(cstate, inp, id, len);
sunyiming 1:6465a3f5c58a 402 break;
sunyiming 1:6465a3f5c58a 403
sunyiming 1:6465a3f5c58a 404 case CHAP_FAILURE:
sunyiming 1:6465a3f5c58a 405 ChapReceiveFailure(cstate, inp, id, len);
sunyiming 1:6465a3f5c58a 406 break;
sunyiming 1:6465a3f5c58a 407
sunyiming 1:6465a3f5c58a 408 case CHAP_SUCCESS:
sunyiming 1:6465a3f5c58a 409 ChapReceiveSuccess(cstate, inp, id, len);
sunyiming 1:6465a3f5c58a 410 break;
sunyiming 1:6465a3f5c58a 411
sunyiming 1:6465a3f5c58a 412 default: /* Need code reject? */
sunyiming 1:6465a3f5c58a 413 CHAPDEBUG(LOG_WARNING, ("Unknown CHAP code (%d) received.\n", code));
sunyiming 1:6465a3f5c58a 414 break;
sunyiming 1:6465a3f5c58a 415 }
sunyiming 1:6465a3f5c58a 416 }
sunyiming 1:6465a3f5c58a 417
sunyiming 1:6465a3f5c58a 418
sunyiming 1:6465a3f5c58a 419 /*
sunyiming 1:6465a3f5c58a 420 * ChapReceiveChallenge - Receive Challenge and send Response.
sunyiming 1:6465a3f5c58a 421 */
sunyiming 1:6465a3f5c58a 422 static void
sunyiming 1:6465a3f5c58a 423 ChapReceiveChallenge(chap_state *cstate, u_char *inp, u_char id, int len)
sunyiming 1:6465a3f5c58a 424 {
sunyiming 1:6465a3f5c58a 425 int rchallenge_len;
sunyiming 1:6465a3f5c58a 426 u_char *rchallenge;
sunyiming 1:6465a3f5c58a 427 int secret_len;
sunyiming 1:6465a3f5c58a 428 char secret[MAXSECRETLEN];
sunyiming 1:6465a3f5c58a 429 char rhostname[256];
sunyiming 1:6465a3f5c58a 430 MD5_CTX mdContext;
sunyiming 1:6465a3f5c58a 431 u_char hash[MD5_SIGNATURE_SIZE];
sunyiming 1:6465a3f5c58a 432
sunyiming 1:6465a3f5c58a 433 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: Rcvd id %d.\n", id));
sunyiming 1:6465a3f5c58a 434 if (cstate->clientstate == CHAPCS_CLOSED ||
sunyiming 1:6465a3f5c58a 435 cstate->clientstate == CHAPCS_PENDING) {
sunyiming 1:6465a3f5c58a 436 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: in state %d\n",
sunyiming 1:6465a3f5c58a 437 cstate->clientstate));
sunyiming 1:6465a3f5c58a 438 return;
sunyiming 1:6465a3f5c58a 439 }
sunyiming 1:6465a3f5c58a 440
sunyiming 1:6465a3f5c58a 441 if (len < 2) {
sunyiming 1:6465a3f5c58a 442 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
sunyiming 1:6465a3f5c58a 443 return;
sunyiming 1:6465a3f5c58a 444 }
sunyiming 1:6465a3f5c58a 445
sunyiming 1:6465a3f5c58a 446 GETCHAR(rchallenge_len, inp);
sunyiming 1:6465a3f5c58a 447 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
sunyiming 1:6465a3f5c58a 448 if (len < 0) {
sunyiming 1:6465a3f5c58a 449 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: rcvd short packet.\n"));
sunyiming 1:6465a3f5c58a 450 return;
sunyiming 1:6465a3f5c58a 451 }
sunyiming 1:6465a3f5c58a 452 rchallenge = inp;
sunyiming 1:6465a3f5c58a 453 INCPTR(rchallenge_len, inp);
sunyiming 1:6465a3f5c58a 454
sunyiming 1:6465a3f5c58a 455 if (len >= (int)sizeof(rhostname)) {
sunyiming 1:6465a3f5c58a 456 len = sizeof(rhostname) - 1;
sunyiming 1:6465a3f5c58a 457 }
sunyiming 1:6465a3f5c58a 458 BCOPY(inp, rhostname, len);
sunyiming 1:6465a3f5c58a 459 rhostname[len] = '\000';
sunyiming 1:6465a3f5c58a 460
sunyiming 1:6465a3f5c58a 461 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: received name field '%s'\n",
sunyiming 1:6465a3f5c58a 462 rhostname));
sunyiming 1:6465a3f5c58a 463
sunyiming 1:6465a3f5c58a 464 /* Microsoft doesn't send their name back in the PPP packet */
sunyiming 1:6465a3f5c58a 465 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
sunyiming 1:6465a3f5c58a 466 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
sunyiming 1:6465a3f5c58a 467 rhostname[sizeof(rhostname) - 1] = 0;
sunyiming 1:6465a3f5c58a 468 CHAPDEBUG(LOG_INFO, ("ChapReceiveChallenge: using '%s' as remote name\n",
sunyiming 1:6465a3f5c58a 469 rhostname));
sunyiming 1:6465a3f5c58a 470 }
sunyiming 1:6465a3f5c58a 471
sunyiming 1:6465a3f5c58a 472 /* get secret for authenticating ourselves with the specified host */
sunyiming 1:6465a3f5c58a 473 if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
sunyiming 1:6465a3f5c58a 474 secret, &secret_len, 0)) {
sunyiming 1:6465a3f5c58a 475 secret_len = 0; /* assume null secret if can't find one */
sunyiming 1:6465a3f5c58a 476 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating us to %s\n",
sunyiming 1:6465a3f5c58a 477 rhostname));
sunyiming 1:6465a3f5c58a 478 }
sunyiming 1:6465a3f5c58a 479
sunyiming 1:6465a3f5c58a 480 /* cancel response send timeout if necessary */
sunyiming 1:6465a3f5c58a 481 if (cstate->clientstate == CHAPCS_RESPONSE) {
sunyiming 1:6465a3f5c58a 482 UNTIMEOUT(ChapResponseTimeout, cstate);
sunyiming 1:6465a3f5c58a 483 }
sunyiming 1:6465a3f5c58a 484
sunyiming 1:6465a3f5c58a 485 cstate->resp_id = id;
sunyiming 1:6465a3f5c58a 486 cstate->resp_transmits = 0;
sunyiming 1:6465a3f5c58a 487
sunyiming 1:6465a3f5c58a 488 /* generate MD based on negotiated type */
sunyiming 1:6465a3f5c58a 489 switch (cstate->resp_type) {
sunyiming 1:6465a3f5c58a 490
sunyiming 1:6465a3f5c58a 491 case CHAP_DIGEST_MD5:
sunyiming 1:6465a3f5c58a 492 MD5Init(&mdContext);
sunyiming 1:6465a3f5c58a 493 MD5Update(&mdContext, &cstate->resp_id, 1);
sunyiming 1:6465a3f5c58a 494 MD5Update(&mdContext, (u_char*)secret, secret_len);
sunyiming 1:6465a3f5c58a 495 MD5Update(&mdContext, rchallenge, rchallenge_len);
sunyiming 1:6465a3f5c58a 496 MD5Final(hash, &mdContext);
sunyiming 1:6465a3f5c58a 497 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
sunyiming 1:6465a3f5c58a 498 cstate->resp_length = MD5_SIGNATURE_SIZE;
sunyiming 1:6465a3f5c58a 499 break;
sunyiming 1:6465a3f5c58a 500
sunyiming 1:6465a3f5c58a 501 #if MSCHAP_SUPPORT
sunyiming 1:6465a3f5c58a 502 case CHAP_MICROSOFT:
sunyiming 1:6465a3f5c58a 503 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
sunyiming 1:6465a3f5c58a 504 break;
sunyiming 1:6465a3f5c58a 505 #endif
sunyiming 1:6465a3f5c58a 506
sunyiming 1:6465a3f5c58a 507 default:
sunyiming 1:6465a3f5c58a 508 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->resp_type));
sunyiming 1:6465a3f5c58a 509 return;
sunyiming 1:6465a3f5c58a 510 }
sunyiming 1:6465a3f5c58a 511
sunyiming 1:6465a3f5c58a 512 BZERO(secret, sizeof(secret));
sunyiming 1:6465a3f5c58a 513 ChapSendResponse(cstate);
sunyiming 1:6465a3f5c58a 514 }
sunyiming 1:6465a3f5c58a 515
sunyiming 1:6465a3f5c58a 516
sunyiming 1:6465a3f5c58a 517 /*
sunyiming 1:6465a3f5c58a 518 * ChapReceiveResponse - Receive and process response.
sunyiming 1:6465a3f5c58a 519 */
sunyiming 1:6465a3f5c58a 520 static void
sunyiming 1:6465a3f5c58a 521 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
sunyiming 1:6465a3f5c58a 522 {
sunyiming 1:6465a3f5c58a 523 u_char *remmd, remmd_len;
sunyiming 1:6465a3f5c58a 524 int secret_len, old_state;
sunyiming 1:6465a3f5c58a 525 int code;
sunyiming 1:6465a3f5c58a 526 char rhostname[256];
sunyiming 1:6465a3f5c58a 527 MD5_CTX mdContext;
sunyiming 1:6465a3f5c58a 528 char secret[MAXSECRETLEN];
sunyiming 1:6465a3f5c58a 529 u_char hash[MD5_SIGNATURE_SIZE];
sunyiming 1:6465a3f5c58a 530
sunyiming 1:6465a3f5c58a 531 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: Rcvd id %d.\n", id));
sunyiming 1:6465a3f5c58a 532
sunyiming 1:6465a3f5c58a 533 if (cstate->serverstate == CHAPSS_CLOSED ||
sunyiming 1:6465a3f5c58a 534 cstate->serverstate == CHAPSS_PENDING) {
sunyiming 1:6465a3f5c58a 535 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: in state %d\n",
sunyiming 1:6465a3f5c58a 536 cstate->serverstate));
sunyiming 1:6465a3f5c58a 537 return;
sunyiming 1:6465a3f5c58a 538 }
sunyiming 1:6465a3f5c58a 539
sunyiming 1:6465a3f5c58a 540 if (id != cstate->chal_id) {
sunyiming 1:6465a3f5c58a 541 return; /* doesn't match ID of last challenge */
sunyiming 1:6465a3f5c58a 542 }
sunyiming 1:6465a3f5c58a 543
sunyiming 1:6465a3f5c58a 544 /*
sunyiming 1:6465a3f5c58a 545 * If we have received a duplicate or bogus Response,
sunyiming 1:6465a3f5c58a 546 * we have to send the same answer (Success/Failure)
sunyiming 1:6465a3f5c58a 547 * as we did for the first Response we saw.
sunyiming 1:6465a3f5c58a 548 */
sunyiming 1:6465a3f5c58a 549 if (cstate->serverstate == CHAPSS_OPEN) {
sunyiming 1:6465a3f5c58a 550 ChapSendStatus(cstate, CHAP_SUCCESS);
sunyiming 1:6465a3f5c58a 551 return;
sunyiming 1:6465a3f5c58a 552 }
sunyiming 1:6465a3f5c58a 553 if (cstate->serverstate == CHAPSS_BADAUTH) {
sunyiming 1:6465a3f5c58a 554 ChapSendStatus(cstate, CHAP_FAILURE);
sunyiming 1:6465a3f5c58a 555 return;
sunyiming 1:6465a3f5c58a 556 }
sunyiming 1:6465a3f5c58a 557
sunyiming 1:6465a3f5c58a 558 if (len < 2) {
sunyiming 1:6465a3f5c58a 559 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
sunyiming 1:6465a3f5c58a 560 return;
sunyiming 1:6465a3f5c58a 561 }
sunyiming 1:6465a3f5c58a 562 GETCHAR(remmd_len, inp); /* get length of MD */
sunyiming 1:6465a3f5c58a 563 remmd = inp; /* get pointer to MD */
sunyiming 1:6465a3f5c58a 564 INCPTR(remmd_len, inp);
sunyiming 1:6465a3f5c58a 565
sunyiming 1:6465a3f5c58a 566 len -= sizeof (u_char) + remmd_len;
sunyiming 1:6465a3f5c58a 567 if (len < 0) {
sunyiming 1:6465a3f5c58a 568 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: rcvd short packet.\n"));
sunyiming 1:6465a3f5c58a 569 return;
sunyiming 1:6465a3f5c58a 570 }
sunyiming 1:6465a3f5c58a 571
sunyiming 1:6465a3f5c58a 572 UNTIMEOUT(ChapChallengeTimeout, cstate);
sunyiming 1:6465a3f5c58a 573
sunyiming 1:6465a3f5c58a 574 if (len >= (int)sizeof(rhostname)) {
sunyiming 1:6465a3f5c58a 575 len = sizeof(rhostname) - 1;
sunyiming 1:6465a3f5c58a 576 }
sunyiming 1:6465a3f5c58a 577 BCOPY(inp, rhostname, len);
sunyiming 1:6465a3f5c58a 578 rhostname[len] = '\000';
sunyiming 1:6465a3f5c58a 579
sunyiming 1:6465a3f5c58a 580 CHAPDEBUG(LOG_INFO, ("ChapReceiveResponse: received name field: %s\n",
sunyiming 1:6465a3f5c58a 581 rhostname));
sunyiming 1:6465a3f5c58a 582
sunyiming 1:6465a3f5c58a 583 /*
sunyiming 1:6465a3f5c58a 584 * Get secret for authenticating them with us,
sunyiming 1:6465a3f5c58a 585 * do the hash ourselves, and compare the result.
sunyiming 1:6465a3f5c58a 586 */
sunyiming 1:6465a3f5c58a 587 code = CHAP_FAILURE;
sunyiming 1:6465a3f5c58a 588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
sunyiming 1:6465a3f5c58a 589 secret, &secret_len, 1)) {
sunyiming 1:6465a3f5c58a 590 CHAPDEBUG(LOG_WARNING, ("No CHAP secret found for authenticating %s\n",
sunyiming 1:6465a3f5c58a 591 rhostname));
sunyiming 1:6465a3f5c58a 592 } else {
sunyiming 1:6465a3f5c58a 593 /* generate MD based on negotiated type */
sunyiming 1:6465a3f5c58a 594 switch (cstate->chal_type) {
sunyiming 1:6465a3f5c58a 595
sunyiming 1:6465a3f5c58a 596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
sunyiming 1:6465a3f5c58a 597 if (remmd_len != MD5_SIGNATURE_SIZE) {
sunyiming 1:6465a3f5c58a 598 break; /* it's not even the right length */
sunyiming 1:6465a3f5c58a 599 }
sunyiming 1:6465a3f5c58a 600 MD5Init(&mdContext);
sunyiming 1:6465a3f5c58a 601 MD5Update(&mdContext, &cstate->chal_id, 1);
sunyiming 1:6465a3f5c58a 602 MD5Update(&mdContext, (u_char*)secret, secret_len);
sunyiming 1:6465a3f5c58a 603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
sunyiming 1:6465a3f5c58a 604 MD5Final(hash, &mdContext);
sunyiming 1:6465a3f5c58a 605
sunyiming 1:6465a3f5c58a 606 /* compare local and remote MDs and send the appropriate status */
sunyiming 1:6465a3f5c58a 607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
sunyiming 1:6465a3f5c58a 608 code = CHAP_SUCCESS; /* they are the same! */
sunyiming 1:6465a3f5c58a 609 }
sunyiming 1:6465a3f5c58a 610 break;
sunyiming 1:6465a3f5c58a 611
sunyiming 1:6465a3f5c58a 612 default:
sunyiming 1:6465a3f5c58a 613 CHAPDEBUG(LOG_INFO, ("unknown digest type %d\n", cstate->chal_type));
sunyiming 1:6465a3f5c58a 614 }
sunyiming 1:6465a3f5c58a 615 }
sunyiming 1:6465a3f5c58a 616
sunyiming 1:6465a3f5c58a 617 BZERO(secret, sizeof(secret));
sunyiming 1:6465a3f5c58a 618 ChapSendStatus(cstate, code);
sunyiming 1:6465a3f5c58a 619
sunyiming 1:6465a3f5c58a 620 if (code == CHAP_SUCCESS) {
sunyiming 1:6465a3f5c58a 621 old_state = cstate->serverstate;
sunyiming 1:6465a3f5c58a 622 cstate->serverstate = CHAPSS_OPEN;
sunyiming 1:6465a3f5c58a 623 if (old_state == CHAPSS_INITIAL_CHAL) {
sunyiming 1:6465a3f5c58a 624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
sunyiming 1:6465a3f5c58a 625 }
sunyiming 1:6465a3f5c58a 626 if (cstate->chal_interval != 0) {
sunyiming 1:6465a3f5c58a 627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
sunyiming 1:6465a3f5c58a 628 }
sunyiming 1:6465a3f5c58a 629 } else {
sunyiming 1:6465a3f5c58a 630 CHAPDEBUG(LOG_ERR, ("CHAP peer authentication failed\n"));
sunyiming 1:6465a3f5c58a 631 cstate->serverstate = CHAPSS_BADAUTH;
sunyiming 1:6465a3f5c58a 632 auth_peer_fail(cstate->unit, PPP_CHAP);
sunyiming 1:6465a3f5c58a 633 }
sunyiming 1:6465a3f5c58a 634 }
sunyiming 1:6465a3f5c58a 635
sunyiming 1:6465a3f5c58a 636 /*
sunyiming 1:6465a3f5c58a 637 * ChapReceiveSuccess - Receive Success
sunyiming 1:6465a3f5c58a 638 */
sunyiming 1:6465a3f5c58a 639 static void
sunyiming 1:6465a3f5c58a 640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
sunyiming 1:6465a3f5c58a 641 {
sunyiming 1:6465a3f5c58a 642 LWIP_UNUSED_ARG(id);
sunyiming 1:6465a3f5c58a 643 LWIP_UNUSED_ARG(inp);
sunyiming 1:6465a3f5c58a 644
sunyiming 1:6465a3f5c58a 645 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: Rcvd id %d.\n", id));
sunyiming 1:6465a3f5c58a 646
sunyiming 1:6465a3f5c58a 647 if (cstate->clientstate == CHAPCS_OPEN) {
sunyiming 1:6465a3f5c58a 648 /* presumably an answer to a duplicate response */
sunyiming 1:6465a3f5c58a 649 return;
sunyiming 1:6465a3f5c58a 650 }
sunyiming 1:6465a3f5c58a 651
sunyiming 1:6465a3f5c58a 652 if (cstate->clientstate != CHAPCS_RESPONSE) {
sunyiming 1:6465a3f5c58a 653 /* don't know what this is */
sunyiming 1:6465a3f5c58a 654 CHAPDEBUG(LOG_INFO, ("ChapReceiveSuccess: in state %d\n",
sunyiming 1:6465a3f5c58a 655 cstate->clientstate));
sunyiming 1:6465a3f5c58a 656 return;
sunyiming 1:6465a3f5c58a 657 }
sunyiming 1:6465a3f5c58a 658
sunyiming 1:6465a3f5c58a 659 UNTIMEOUT(ChapResponseTimeout, cstate);
sunyiming 1:6465a3f5c58a 660
sunyiming 1:6465a3f5c58a 661 /*
sunyiming 1:6465a3f5c58a 662 * Print message.
sunyiming 1:6465a3f5c58a 663 */
sunyiming 1:6465a3f5c58a 664 if (len > 0) {
sunyiming 1:6465a3f5c58a 665 PRINTMSG(inp, len);
sunyiming 1:6465a3f5c58a 666 }
sunyiming 1:6465a3f5c58a 667
sunyiming 1:6465a3f5c58a 668 cstate->clientstate = CHAPCS_OPEN;
sunyiming 1:6465a3f5c58a 669
sunyiming 1:6465a3f5c58a 670 auth_withpeer_success(cstate->unit, PPP_CHAP);
sunyiming 1:6465a3f5c58a 671 }
sunyiming 1:6465a3f5c58a 672
sunyiming 1:6465a3f5c58a 673
sunyiming 1:6465a3f5c58a 674 /*
sunyiming 1:6465a3f5c58a 675 * ChapReceiveFailure - Receive failure.
sunyiming 1:6465a3f5c58a 676 */
sunyiming 1:6465a3f5c58a 677 static void
sunyiming 1:6465a3f5c58a 678 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
sunyiming 1:6465a3f5c58a 679 {
sunyiming 1:6465a3f5c58a 680 LWIP_UNUSED_ARG(id);
sunyiming 1:6465a3f5c58a 681 LWIP_UNUSED_ARG(inp);
sunyiming 1:6465a3f5c58a 682
sunyiming 1:6465a3f5c58a 683 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: Rcvd id %d.\n", id));
sunyiming 1:6465a3f5c58a 684
sunyiming 1:6465a3f5c58a 685 if (cstate->clientstate != CHAPCS_RESPONSE) {
sunyiming 1:6465a3f5c58a 686 /* don't know what this is */
sunyiming 1:6465a3f5c58a 687 CHAPDEBUG(LOG_INFO, ("ChapReceiveFailure: in state %d\n",
sunyiming 1:6465a3f5c58a 688 cstate->clientstate));
sunyiming 1:6465a3f5c58a 689 return;
sunyiming 1:6465a3f5c58a 690 }
sunyiming 1:6465a3f5c58a 691
sunyiming 1:6465a3f5c58a 692 UNTIMEOUT(ChapResponseTimeout, cstate);
sunyiming 1:6465a3f5c58a 693
sunyiming 1:6465a3f5c58a 694 /*
sunyiming 1:6465a3f5c58a 695 * Print message.
sunyiming 1:6465a3f5c58a 696 */
sunyiming 1:6465a3f5c58a 697 if (len > 0) {
sunyiming 1:6465a3f5c58a 698 PRINTMSG(inp, len);
sunyiming 1:6465a3f5c58a 699 }
sunyiming 1:6465a3f5c58a 700
sunyiming 1:6465a3f5c58a 701 CHAPDEBUG(LOG_ERR, ("CHAP authentication failed\n"));
sunyiming 1:6465a3f5c58a 702 auth_withpeer_fail(cstate->unit, PPP_CHAP); /* lwip: just sets the PPP error code on this unit to PPPERR_AUTHFAIL */
sunyiming 1:6465a3f5c58a 703 }
sunyiming 1:6465a3f5c58a 704
sunyiming 1:6465a3f5c58a 705
sunyiming 1:6465a3f5c58a 706 /*
sunyiming 1:6465a3f5c58a 707 * ChapSendChallenge - Send an Authenticate challenge.
sunyiming 1:6465a3f5c58a 708 */
sunyiming 1:6465a3f5c58a 709 static void
sunyiming 1:6465a3f5c58a 710 ChapSendChallenge(chap_state *cstate)
sunyiming 1:6465a3f5c58a 711 {
sunyiming 1:6465a3f5c58a 712 u_char *outp;
sunyiming 1:6465a3f5c58a 713 int chal_len, name_len;
sunyiming 1:6465a3f5c58a 714 int outlen;
sunyiming 1:6465a3f5c58a 715
sunyiming 1:6465a3f5c58a 716 chal_len = cstate->chal_len;
sunyiming 1:6465a3f5c58a 717 name_len = (int)strlen(cstate->chal_name);
sunyiming 1:6465a3f5c58a 718 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
sunyiming 1:6465a3f5c58a 719 outp = outpacket_buf[cstate->unit];
sunyiming 1:6465a3f5c58a 720
sunyiming 1:6465a3f5c58a 721 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
sunyiming 1:6465a3f5c58a 722
sunyiming 1:6465a3f5c58a 723 PUTCHAR(CHAP_CHALLENGE, outp);
sunyiming 1:6465a3f5c58a 724 PUTCHAR(cstate->chal_id, outp);
sunyiming 1:6465a3f5c58a 725 PUTSHORT(outlen, outp);
sunyiming 1:6465a3f5c58a 726
sunyiming 1:6465a3f5c58a 727 PUTCHAR(chal_len, outp); /* put length of challenge */
sunyiming 1:6465a3f5c58a 728 BCOPY(cstate->challenge, outp, chal_len);
sunyiming 1:6465a3f5c58a 729 INCPTR(chal_len, outp);
sunyiming 1:6465a3f5c58a 730
sunyiming 1:6465a3f5c58a 731 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
sunyiming 1:6465a3f5c58a 732
sunyiming 1:6465a3f5c58a 733 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
sunyiming 1:6465a3f5c58a 734
sunyiming 1:6465a3f5c58a 735 CHAPDEBUG(LOG_INFO, ("ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
sunyiming 1:6465a3f5c58a 736
sunyiming 1:6465a3f5c58a 737 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
sunyiming 1:6465a3f5c58a 738 ++cstate->chal_transmits;
sunyiming 1:6465a3f5c58a 739 }
sunyiming 1:6465a3f5c58a 740
sunyiming 1:6465a3f5c58a 741
sunyiming 1:6465a3f5c58a 742 /*
sunyiming 1:6465a3f5c58a 743 * ChapSendStatus - Send a status response (ack or nak).
sunyiming 1:6465a3f5c58a 744 */
sunyiming 1:6465a3f5c58a 745 static void
sunyiming 1:6465a3f5c58a 746 ChapSendStatus(chap_state *cstate, int code)
sunyiming 1:6465a3f5c58a 747 {
sunyiming 1:6465a3f5c58a 748 u_char *outp;
sunyiming 1:6465a3f5c58a 749 int outlen, msglen;
sunyiming 1:6465a3f5c58a 750 char msg[256]; /* @todo: this can be a char*, no strcpy needed */
sunyiming 1:6465a3f5c58a 751
sunyiming 1:6465a3f5c58a 752 if (code == CHAP_SUCCESS) {
sunyiming 1:6465a3f5c58a 753 strcpy(msg, "Welcome!");
sunyiming 1:6465a3f5c58a 754 } else {
sunyiming 1:6465a3f5c58a 755 strcpy(msg, "I don't like you. Go 'way.");
sunyiming 1:6465a3f5c58a 756 }
sunyiming 1:6465a3f5c58a 757 msglen = (int)strlen(msg);
sunyiming 1:6465a3f5c58a 758
sunyiming 1:6465a3f5c58a 759 outlen = CHAP_HEADERLEN + msglen;
sunyiming 1:6465a3f5c58a 760 outp = outpacket_buf[cstate->unit];
sunyiming 1:6465a3f5c58a 761
sunyiming 1:6465a3f5c58a 762 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
sunyiming 1:6465a3f5c58a 763
sunyiming 1:6465a3f5c58a 764 PUTCHAR(code, outp);
sunyiming 1:6465a3f5c58a 765 PUTCHAR(cstate->chal_id, outp);
sunyiming 1:6465a3f5c58a 766 PUTSHORT(outlen, outp);
sunyiming 1:6465a3f5c58a 767 BCOPY(msg, outp, msglen);
sunyiming 1:6465a3f5c58a 768 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
sunyiming 1:6465a3f5c58a 769
sunyiming 1:6465a3f5c58a 770 CHAPDEBUG(LOG_INFO, ("ChapSendStatus: Sent code %d, id %d.\n", code,
sunyiming 1:6465a3f5c58a 771 cstate->chal_id));
sunyiming 1:6465a3f5c58a 772 }
sunyiming 1:6465a3f5c58a 773
sunyiming 1:6465a3f5c58a 774 /*
sunyiming 1:6465a3f5c58a 775 * ChapGenChallenge is used to generate a pseudo-random challenge string of
sunyiming 1:6465a3f5c58a 776 * a pseudo-random length between min_len and max_len. The challenge
sunyiming 1:6465a3f5c58a 777 * string and its length are stored in *cstate, and various other fields of
sunyiming 1:6465a3f5c58a 778 * *cstate are initialized.
sunyiming 1:6465a3f5c58a 779 */
sunyiming 1:6465a3f5c58a 780
sunyiming 1:6465a3f5c58a 781 static void
sunyiming 1:6465a3f5c58a 782 ChapGenChallenge(chap_state *cstate)
sunyiming 1:6465a3f5c58a 783 {
sunyiming 1:6465a3f5c58a 784 int chal_len;
sunyiming 1:6465a3f5c58a 785 u_char *ptr = cstate->challenge;
sunyiming 1:6465a3f5c58a 786 int i;
sunyiming 1:6465a3f5c58a 787
sunyiming 1:6465a3f5c58a 788 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
sunyiming 1:6465a3f5c58a 789 MAX_CHALLENGE_LENGTH */
sunyiming 1:6465a3f5c58a 790 chal_len = (unsigned)
sunyiming 1:6465a3f5c58a 791 ((((magic() >> 16) *
sunyiming 1:6465a3f5c58a 792 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
sunyiming 1:6465a3f5c58a 793 + MIN_CHALLENGE_LENGTH);
sunyiming 1:6465a3f5c58a 794 LWIP_ASSERT("chal_len <= 0xff", chal_len <= 0xffff);
sunyiming 1:6465a3f5c58a 795 cstate->chal_len = (u_char)chal_len;
sunyiming 1:6465a3f5c58a 796 cstate->chal_id = ++cstate->id;
sunyiming 1:6465a3f5c58a 797 cstate->chal_transmits = 0;
sunyiming 1:6465a3f5c58a 798
sunyiming 1:6465a3f5c58a 799 /* generate a random string */
sunyiming 1:6465a3f5c58a 800 for (i = 0; i < chal_len; i++ ) {
sunyiming 1:6465a3f5c58a 801 *ptr++ = (char) (magic() & 0xff);
sunyiming 1:6465a3f5c58a 802 }
sunyiming 1:6465a3f5c58a 803 }
sunyiming 1:6465a3f5c58a 804
sunyiming 1:6465a3f5c58a 805 /*
sunyiming 1:6465a3f5c58a 806 * ChapSendResponse - send a response packet with values as specified
sunyiming 1:6465a3f5c58a 807 * in *cstate.
sunyiming 1:6465a3f5c58a 808 */
sunyiming 1:6465a3f5c58a 809 /* ARGSUSED */
sunyiming 1:6465a3f5c58a 810 static void
sunyiming 1:6465a3f5c58a 811 ChapSendResponse(chap_state *cstate)
sunyiming 1:6465a3f5c58a 812 {
sunyiming 1:6465a3f5c58a 813 u_char *outp;
sunyiming 1:6465a3f5c58a 814 int outlen, md_len, name_len;
sunyiming 1:6465a3f5c58a 815
sunyiming 1:6465a3f5c58a 816 md_len = cstate->resp_length;
sunyiming 1:6465a3f5c58a 817 name_len = (int)strlen(cstate->resp_name);
sunyiming 1:6465a3f5c58a 818 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
sunyiming 1:6465a3f5c58a 819 outp = outpacket_buf[cstate->unit];
sunyiming 1:6465a3f5c58a 820
sunyiming 1:6465a3f5c58a 821 MAKEHEADER(outp, PPP_CHAP);
sunyiming 1:6465a3f5c58a 822
sunyiming 1:6465a3f5c58a 823 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
sunyiming 1:6465a3f5c58a 824 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
sunyiming 1:6465a3f5c58a 825 PUTSHORT(outlen, outp); /* packet length */
sunyiming 1:6465a3f5c58a 826
sunyiming 1:6465a3f5c58a 827 PUTCHAR(md_len, outp); /* length of MD */
sunyiming 1:6465a3f5c58a 828 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
sunyiming 1:6465a3f5c58a 829 INCPTR(md_len, outp);
sunyiming 1:6465a3f5c58a 830
sunyiming 1:6465a3f5c58a 831 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
sunyiming 1:6465a3f5c58a 832
sunyiming 1:6465a3f5c58a 833 /* send the packet */
sunyiming 1:6465a3f5c58a 834 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
sunyiming 1:6465a3f5c58a 835
sunyiming 1:6465a3f5c58a 836 cstate->clientstate = CHAPCS_RESPONSE;
sunyiming 1:6465a3f5c58a 837 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
sunyiming 1:6465a3f5c58a 838 ++cstate->resp_transmits;
sunyiming 1:6465a3f5c58a 839 }
sunyiming 1:6465a3f5c58a 840
sunyiming 1:6465a3f5c58a 841 #if PPP_ADDITIONAL_CALLBACKS
sunyiming 1:6465a3f5c58a 842 static char *ChapCodenames[] = {
sunyiming 1:6465a3f5c58a 843 "Challenge", "Response", "Success", "Failure"
sunyiming 1:6465a3f5c58a 844 };
sunyiming 1:6465a3f5c58a 845 /*
sunyiming 1:6465a3f5c58a 846 * ChapPrintPkt - print the contents of a CHAP packet.
sunyiming 1:6465a3f5c58a 847 */
sunyiming 1:6465a3f5c58a 848 static int
sunyiming 1:6465a3f5c58a 849 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
sunyiming 1:6465a3f5c58a 850 {
sunyiming 1:6465a3f5c58a 851 int code, id, len;
sunyiming 1:6465a3f5c58a 852 int clen, nlen;
sunyiming 1:6465a3f5c58a 853 u_char x;
sunyiming 1:6465a3f5c58a 854
sunyiming 1:6465a3f5c58a 855 if (plen < CHAP_HEADERLEN) {
sunyiming 1:6465a3f5c58a 856 return 0;
sunyiming 1:6465a3f5c58a 857 }
sunyiming 1:6465a3f5c58a 858 GETCHAR(code, p);
sunyiming 1:6465a3f5c58a 859 GETCHAR(id, p);
sunyiming 1:6465a3f5c58a 860 GETSHORT(len, p);
sunyiming 1:6465a3f5c58a 861 if (len < CHAP_HEADERLEN || len > plen) {
sunyiming 1:6465a3f5c58a 862 return 0;
sunyiming 1:6465a3f5c58a 863 }
sunyiming 1:6465a3f5c58a 864
sunyiming 1:6465a3f5c58a 865 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
sunyiming 1:6465a3f5c58a 866 printer(arg, " %s", ChapCodenames[code-1]);
sunyiming 1:6465a3f5c58a 867 } else {
sunyiming 1:6465a3f5c58a 868 printer(arg, " code=0x%x", code);
sunyiming 1:6465a3f5c58a 869 }
sunyiming 1:6465a3f5c58a 870 printer(arg, " id=0x%x", id);
sunyiming 1:6465a3f5c58a 871 len -= CHAP_HEADERLEN;
sunyiming 1:6465a3f5c58a 872 switch (code) {
sunyiming 1:6465a3f5c58a 873 case CHAP_CHALLENGE:
sunyiming 1:6465a3f5c58a 874 case CHAP_RESPONSE:
sunyiming 1:6465a3f5c58a 875 if (len < 1) {
sunyiming 1:6465a3f5c58a 876 break;
sunyiming 1:6465a3f5c58a 877 }
sunyiming 1:6465a3f5c58a 878 clen = p[0];
sunyiming 1:6465a3f5c58a 879 if (len < clen + 1) {
sunyiming 1:6465a3f5c58a 880 break;
sunyiming 1:6465a3f5c58a 881 }
sunyiming 1:6465a3f5c58a 882 ++p;
sunyiming 1:6465a3f5c58a 883 nlen = len - clen - 1;
sunyiming 1:6465a3f5c58a 884 printer(arg, " <");
sunyiming 1:6465a3f5c58a 885 for (; clen > 0; --clen) {
sunyiming 1:6465a3f5c58a 886 GETCHAR(x, p);
sunyiming 1:6465a3f5c58a 887 printer(arg, "%.2x", x);
sunyiming 1:6465a3f5c58a 888 }
sunyiming 1:6465a3f5c58a 889 printer(arg, ">, name = %.*Z", nlen, p);
sunyiming 1:6465a3f5c58a 890 break;
sunyiming 1:6465a3f5c58a 891 case CHAP_FAILURE:
sunyiming 1:6465a3f5c58a 892 case CHAP_SUCCESS:
sunyiming 1:6465a3f5c58a 893 printer(arg, " %.*Z", len, p);
sunyiming 1:6465a3f5c58a 894 break;
sunyiming 1:6465a3f5c58a 895 default:
sunyiming 1:6465a3f5c58a 896 for (clen = len; clen > 0; --clen) {
sunyiming 1:6465a3f5c58a 897 GETCHAR(x, p);
sunyiming 1:6465a3f5c58a 898 printer(arg, " %.2x", x);
sunyiming 1:6465a3f5c58a 899 }
sunyiming 1:6465a3f5c58a 900 }
sunyiming 1:6465a3f5c58a 901
sunyiming 1:6465a3f5c58a 902 return len + CHAP_HEADERLEN;
sunyiming 1:6465a3f5c58a 903 }
sunyiming 1:6465a3f5c58a 904 #endif /* PPP_ADDITIONAL_CALLBACKS */
sunyiming 1:6465a3f5c58a 905
sunyiming 1:6465a3f5c58a 906 #endif /* CHAP_SUPPORT */
sunyiming 1:6465a3f5c58a 907
sunyiming 1:6465a3f5c58a 908 #endif /* PPP_SUPPORT */