1 /* 2 * PPP CHAP Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * $Id: chap.c,v 1.53 1999/07/15 02:02:51 brian Exp $ 21 * 22 * TODO: 23 */ 24 #include <sys/param.h> 25 #include <netinet/in.h> 26 #include <netinet/in_systm.h> 27 #include <netinet/ip.h> 28 #include <sys/un.h> 29 30 #include <errno.h> 31 #include <fcntl.h> 32 #ifdef HAVE_DES 33 #include <md4.h> 34 #endif 35 #include <md5.h> 36 #include <paths.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <sys/wait.h> 42 #include <termios.h> 43 #include <unistd.h> 44 45 #include "layer.h" 46 #include "mbuf.h" 47 #include "log.h" 48 #include "defs.h" 49 #include "timer.h" 50 #include "fsm.h" 51 #include "proto.h" 52 #include "lcp.h" 53 #include "lqr.h" 54 #include "hdlc.h" 55 #include "auth.h" 56 #include "async.h" 57 #include "throughput.h" 58 #include "descriptor.h" 59 #include "chap.h" 60 #include "iplist.h" 61 #include "slcompress.h" 62 #include "ipcp.h" 63 #include "filter.h" 64 #include "ccp.h" 65 #include "link.h" 66 #include "physical.h" 67 #include "mp.h" 68 #ifndef NORADIUS 69 #include "radius.h" 70 #endif 71 #include "bundle.h" 72 #include "chat.h" 73 #include "cbcp.h" 74 #include "command.h" 75 #include "datalink.h" 76 #ifdef HAVE_DES 77 #include "chap_ms.h" 78 #endif 79 80 static const char *chapcodes[] = { 81 "???", "CHALLENGE", "RESPONSE", "SUCCESS", "FAILURE" 82 }; 83 #define MAXCHAPCODE (sizeof chapcodes / sizeof chapcodes[0] - 1) 84 85 static void 86 ChapOutput(struct physical *physical, u_int code, u_int id, 87 const u_char *ptr, int count, const char *text) 88 { 89 int plen; 90 struct fsmheader lh; 91 struct mbuf *bp; 92 93 plen = sizeof(struct fsmheader) + count; 94 lh.code = code; 95 lh.id = id; 96 lh.length = htons(plen); 97 bp = mbuf_Alloc(plen, MB_CHAPOUT); 98 memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader)); 99 if (count) 100 memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count); 101 log_DumpBp(LogDEBUG, "ChapOutput", bp); 102 if (text == NULL) 103 log_Printf(LogPHASE, "Chap Output: %s\n", chapcodes[code]); 104 else 105 log_Printf(LogPHASE, "Chap Output: %s (%s)\n", chapcodes[code], text); 106 link_PushPacket(&physical->link, bp, physical->dl->bundle, 107 PRI_LINK, PROTO_CHAP); 108 } 109 110 static char * 111 chap_BuildAnswer(char *name, char *key, u_char id, char *challenge, u_char type 112 #ifdef HAVE_DES 113 , int lanman 114 #endif 115 ) 116 { 117 char *result, *digest; 118 size_t nlen, klen; 119 120 nlen = strlen(name); 121 klen = strlen(key); 122 123 #ifdef HAVE_DES 124 if (type == 0x80) { 125 char expkey[AUTHLEN << 2]; 126 MD4_CTX MD4context; 127 int f; 128 129 if ((result = malloc(1 + nlen + MS_CHAP_RESPONSE_LEN)) == NULL) 130 return result; 131 132 digest = result; /* the response */ 133 *digest++ = MS_CHAP_RESPONSE_LEN; /* 49 */ 134 memcpy(digest + MS_CHAP_RESPONSE_LEN, name, nlen); 135 if (lanman) { 136 memset(digest + 24, '\0', 25); 137 mschap_LANMan(digest, challenge + 1, key); /* LANMan response */ 138 } else { 139 memset(digest, '\0', 25); 140 digest += 24; 141 142 for (f = 0; f < klen; f++) { 143 expkey[2*f] = key[f]; 144 expkey[2*f+1] = '\0'; 145 } 146 /* 147 * ----------- 148 * expkey = | k\0e\0y\0 | 149 * ----------- 150 */ 151 MD4Init(&MD4context); 152 MD4Update(&MD4context, expkey, klen << 1); 153 MD4Final(digest, &MD4context); 154 155 /* 156 * ---- -------- ---------------- ------- ------ 157 * result = | 49 | LANMan | 16 byte digest | 9 * ? | name | 158 * ---- -------- ---------------- ------- ------ 159 */ 160 mschap_NT(digest, challenge + 1); 161 } 162 /* 163 * ---- -------- ------------- ----- ------ 164 * | | struct MS_ChapResponse24 | | 165 * result = | 49 | LANMan | NT digest | 0/1 | name | 166 * ---- -------- ------------- ----- ------ 167 * where only one of LANMan & NT digest are set. 168 */ 169 } else 170 #endif 171 if ((result = malloc(nlen + 17)) != NULL) { 172 /* Normal MD5 stuff */ 173 MD5_CTX MD5context; 174 175 digest = result; 176 *digest++ = 16; /* value size */ 177 178 MD5Init(&MD5context); 179 MD5Update(&MD5context, &id, 1); 180 MD5Update(&MD5context, key, klen); 181 MD5Update(&MD5context, challenge + 1, *challenge); 182 MD5Final(digest, &MD5context); 183 184 memcpy(digest + 16, name, nlen); 185 /* 186 * ---- -------- ------ 187 * result = | 16 | digest | name | 188 * ---- -------- ------ 189 */ 190 } 191 192 return result; 193 } 194 195 static void 196 chap_StartChild(struct chap *chap, char *prog, const char *name) 197 { 198 char *argv[MAXARGS], *nargv[MAXARGS]; 199 int argc, fd; 200 int in[2], out[2]; 201 pid_t pid; 202 203 if (chap->child.fd != -1) { 204 log_Printf(LogWARN, "Chap: %s: Program already running\n", prog); 205 return; 206 } 207 208 if (pipe(in) == -1) { 209 log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 210 return; 211 } 212 213 if (pipe(out) == -1) { 214 log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno)); 215 close(in[0]); 216 close(in[1]); 217 return; 218 } 219 220 pid = getpid(); 221 switch ((chap->child.pid = fork())) { 222 case -1: 223 log_Printf(LogERROR, "Chap: fork: %s\n", strerror(errno)); 224 close(in[0]); 225 close(in[1]); 226 close(out[0]); 227 close(out[1]); 228 chap->child.pid = 0; 229 return; 230 231 case 0: 232 timer_TermService(); 233 close(in[1]); 234 close(out[0]); 235 if (out[1] == STDIN_FILENO) 236 out[1] = dup(out[1]); 237 dup2(in[0], STDIN_FILENO); 238 dup2(out[1], STDOUT_FILENO); 239 close(STDERR_FILENO); 240 if (open(_PATH_DEVNULL, O_RDWR) != STDERR_FILENO) { 241 log_Printf(LogALERT, "Chap: Failed to open %s: %s\n", 242 _PATH_DEVNULL, strerror(errno)); 243 exit(1); 244 } 245 for (fd = getdtablesize(); fd > STDERR_FILENO; fd--) 246 fcntl(fd, F_SETFD, 1); 247 setuid(geteuid()); 248 argc = command_Interpret(prog, strlen(prog), argv); 249 command_Expand(nargv, argc, (char const *const *)argv, 250 chap->auth.physical->dl->bundle, 0, pid); 251 execvp(nargv[0], nargv); 252 printf("exec() of %s failed: %s\n", nargv[0], strerror(errno)); 253 _exit(255); 254 255 default: 256 close(in[0]); 257 close(out[1]); 258 chap->child.fd = out[0]; 259 chap->child.buf.len = 0; 260 write(in[1], chap->auth.in.name, strlen(chap->auth.in.name)); 261 write(in[1], "\n", 1); 262 write(in[1], chap->challenge.peer + 1, *chap->challenge.peer); 263 write(in[1], "\n", 1); 264 write(in[1], name, strlen(name)); 265 write(in[1], "\n", 1); 266 close(in[1]); 267 break; 268 } 269 } 270 271 static void 272 chap_Cleanup(struct chap *chap, int sig) 273 { 274 if (chap->child.pid) { 275 int status; 276 277 close(chap->child.fd); 278 chap->child.fd = -1; 279 if (sig) 280 kill(chap->child.pid, SIGTERM); 281 chap->child.pid = 0; 282 chap->child.buf.len = 0; 283 284 if (wait(&status) == -1) 285 log_Printf(LogERROR, "Chap: wait: %s\n", strerror(errno)); 286 else if (WIFSIGNALED(status)) 287 log_Printf(LogWARN, "Chap: Child received signal %d\n", WTERMSIG(status)); 288 else if (WIFEXITED(status) && WEXITSTATUS(status)) 289 log_Printf(LogERROR, "Chap: Child exited %d\n", WEXITSTATUS(status)); 290 } 291 *chap->challenge.local = *chap->challenge.peer = '\0'; 292 #ifdef HAVE_DES 293 chap->peertries = 0; 294 #endif 295 } 296 297 static void 298 chap_Respond(struct chap *chap, char *name, char *key, u_char type 299 #ifdef HAVE_DES 300 , int lm 301 #endif 302 ) 303 { 304 u_char *ans; 305 306 ans = chap_BuildAnswer(name, key, chap->auth.id, chap->challenge.peer, type 307 #ifdef HAVE_DES 308 , lm 309 #endif 310 ); 311 312 if (ans) { 313 ChapOutput(chap->auth.physical, CHAP_RESPONSE, chap->auth.id, 314 ans, *ans + 1 + strlen(name), name); 315 #ifdef HAVE_DES 316 chap->NTRespSent = !lm; 317 #endif 318 free(ans); 319 } else 320 ChapOutput(chap->auth.physical, CHAP_FAILURE, chap->auth.id, 321 "Out of memory!", 14, NULL); 322 } 323 324 static int 325 chap_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 326 { 327 struct chap *chap = descriptor2chap(d); 328 329 if (r && chap && chap->child.fd != -1) { 330 FD_SET(chap->child.fd, r); 331 if (*n < chap->child.fd + 1) 332 *n = chap->child.fd + 1; 333 log_Printf(LogTIMER, "Chap: fdset(r) %d\n", chap->child.fd); 334 return 1; 335 } 336 337 return 0; 338 } 339 340 static int 341 chap_IsSet(struct descriptor *d, const fd_set *fdset) 342 { 343 struct chap *chap = descriptor2chap(d); 344 345 return chap && chap->child.fd != -1 && FD_ISSET(chap->child.fd, fdset); 346 } 347 348 static void 349 chap_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 350 { 351 struct chap *chap = descriptor2chap(d); 352 int got; 353 354 got = read(chap->child.fd, chap->child.buf.ptr + chap->child.buf.len, 355 sizeof chap->child.buf.ptr - chap->child.buf.len - 1); 356 if (got == -1) { 357 log_Printf(LogERROR, "Chap: Read: %s\n", strerror(errno)); 358 chap_Cleanup(chap, SIGTERM); 359 } else if (got == 0) { 360 log_Printf(LogWARN, "Chap: Read: Child terminated connection\n"); 361 chap_Cleanup(chap, SIGTERM); 362 } else { 363 char *name, *key, *end; 364 365 chap->child.buf.len += got; 366 chap->child.buf.ptr[chap->child.buf.len] = '\0'; 367 name = chap->child.buf.ptr; 368 name += strspn(name, " \t"); 369 if ((key = strchr(name, '\n')) == NULL) 370 end = NULL; 371 else 372 end = strchr(++key, '\n'); 373 374 if (end == NULL) { 375 if (chap->child.buf.len == sizeof chap->child.buf.ptr - 1) { 376 log_Printf(LogWARN, "Chap: Read: Input buffer overflow\n"); 377 chap_Cleanup(chap, SIGTERM); 378 } 379 } else { 380 #ifdef HAVE_DES 381 int lanman = chap->auth.physical->link.lcp.his_authtype == 0x80 && 382 ((chap->NTRespSent && 383 IsAccepted(chap->auth.physical->link.lcp.cfg.chap80lm)) || 384 !IsAccepted(chap->auth.physical->link.lcp.cfg.chap80nt)); 385 #endif 386 387 while (end >= name && strchr(" \t\r\n", *end)) 388 *end-- = '\0'; 389 end = key - 1; 390 while (end >= name && strchr(" \t\r\n", *end)) 391 *end-- = '\0'; 392 key += strspn(key, " \t"); 393 394 chap_Respond(chap, name, key, chap->auth.physical->link.lcp.his_authtype 395 #ifdef HAVE_DES 396 , lanman 397 #endif 398 ); 399 chap_Cleanup(chap, 0); 400 } 401 } 402 } 403 404 static int 405 chap_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset) 406 { 407 /* We never want to write here ! */ 408 log_Printf(LogALERT, "chap_Write: Internal error: Bad call !\n"); 409 return 0; 410 } 411 412 static void 413 chap_Challenge(struct authinfo *authp) 414 { 415 struct chap *chap = auth2chap(authp); 416 int len, i; 417 char *cp; 418 419 len = strlen(authp->physical->dl->bundle->cfg.auth.name); 420 421 if (!*chap->challenge.local) { 422 randinit(); 423 cp = chap->challenge.local; 424 425 #ifndef NORADIUS 426 if (*authp->physical->dl->bundle->radius.cfg.file) { 427 /* For radius, our challenge is 16 readable NUL terminated bytes :*/ 428 *cp++ = 16; 429 for (i = 0; i < 16; i++) 430 *cp++ = (random() % 10) + '0'; 431 } else 432 #endif 433 { 434 #ifdef HAVE_DES 435 if (authp->physical->link.lcp.want_authtype == 0x80) 436 *cp++ = 8; /* MS does 8 byte callenges :-/ */ 437 else 438 #endif 439 *cp++ = random() % (CHAPCHALLENGELEN-16) + 16; 440 for (i = 0; i < *chap->challenge.local; i++) 441 *cp++ = random() & 0xff; 442 } 443 memcpy(cp, authp->physical->dl->bundle->cfg.auth.name, len); 444 } 445 ChapOutput(authp->physical, CHAP_CHALLENGE, authp->id, chap->challenge.local, 446 1 + *chap->challenge.local + len, NULL); 447 } 448 449 static void 450 chap_Success(struct authinfo *authp) 451 { 452 datalink_GotAuthname(authp->physical->dl, authp->in.name); 453 ChapOutput(authp->physical, CHAP_SUCCESS, authp->id, "Welcome!!", 10, NULL); 454 authp->physical->link.lcp.auth_ineed = 0; 455 if (Enabled(authp->physical->dl->bundle, OPT_UTMP)) 456 physical_Login(authp->physical, authp->in.name); 457 458 if (authp->physical->link.lcp.auth_iwait == 0) 459 /* 460 * Either I didn't need to authenticate, or I've already been 461 * told that I got the answer right. 462 */ 463 datalink_AuthOk(authp->physical->dl); 464 } 465 466 static void 467 chap_Failure(struct authinfo *authp) 468 { 469 ChapOutput(authp->physical, CHAP_FAILURE, authp->id, "Invalid!!", 9, NULL); 470 datalink_AuthNotOk(authp->physical->dl); 471 } 472 473 static int 474 chap_Cmp(u_char type, char *myans, int mylen, char *hisans, int hislen 475 #ifdef HAVE_DES 476 , int lm 477 #endif 478 ) 479 { 480 if (mylen != hislen) 481 return 0; 482 #ifdef HAVE_DES 483 else if (type == 0x80) { 484 int off = lm ? 0 : 24; 485 486 if (memcmp(myans + off, hisans + off, 24)) 487 return 0; 488 } 489 #endif 490 else if (memcmp(myans, hisans, mylen)) 491 return 0; 492 493 return 1; 494 } 495 496 #ifdef HAVE_DES 497 static int 498 chap_HaveAnotherGo(struct chap *chap) 499 { 500 if (++chap->peertries < 3) { 501 /* Give the peer another shot */ 502 *chap->challenge.local = '\0'; 503 chap_Challenge(&chap->auth); 504 return 1; 505 } 506 507 return 0; 508 } 509 #endif 510 511 void 512 chap_Init(struct chap *chap, struct physical *p) 513 { 514 chap->desc.type = CHAP_DESCRIPTOR; 515 chap->desc.UpdateSet = chap_UpdateSet; 516 chap->desc.IsSet = chap_IsSet; 517 chap->desc.Read = chap_Read; 518 chap->desc.Write = chap_Write; 519 chap->child.pid = 0; 520 chap->child.fd = -1; 521 auth_Init(&chap->auth, p, chap_Challenge, chap_Success, chap_Failure); 522 *chap->challenge.local = *chap->challenge.peer = '\0'; 523 #ifdef HAVE_DES 524 chap->NTRespSent = 0; 525 chap->peertries = 0; 526 #endif 527 } 528 529 void 530 chap_ReInit(struct chap *chap) 531 { 532 chap_Cleanup(chap, SIGTERM); 533 } 534 535 struct mbuf * 536 chap_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) 537 { 538 struct physical *p = link2physical(l); 539 struct chap *chap = &p->dl->chap; 540 char *name, *key, *ans; 541 int len, nlen; 542 u_char alen; 543 #ifdef HAVE_DES 544 int lanman; 545 #endif 546 547 if (p == NULL) { 548 log_Printf(LogERROR, "chap_Input: Not a physical link - dropped\n"); 549 mbuf_Free(bp); 550 return NULL; 551 } 552 553 if (bundle_Phase(bundle) != PHASE_NETWORK && 554 bundle_Phase(bundle) != PHASE_AUTHENTICATE) { 555 log_Printf(LogPHASE, "Unexpected chap input - dropped !\n"); 556 mbuf_Free(bp); 557 return NULL; 558 } 559 560 mbuf_SetType(bp, MB_CHAPIN); 561 if ((bp = auth_ReadHeader(&chap->auth, bp)) == NULL && 562 ntohs(chap->auth.in.hdr.length) == 0) 563 log_Printf(LogWARN, "Chap Input: Truncated header !\n"); 564 else if (chap->auth.in.hdr.code == 0 || chap->auth.in.hdr.code > MAXCHAPCODE) 565 log_Printf(LogPHASE, "Chap Input: %d: Bad CHAP code !\n", 566 chap->auth.in.hdr.code); 567 else { 568 len = mbuf_Length(bp); 569 ans = NULL; 570 571 if (chap->auth.in.hdr.code != CHAP_CHALLENGE && 572 chap->auth.id != chap->auth.in.hdr.id && 573 Enabled(bundle, OPT_IDCHECK)) { 574 /* Wrong conversation dude ! */ 575 log_Printf(LogPHASE, "Chap Input: %s dropped (got id %d, not %d)\n", 576 chapcodes[chap->auth.in.hdr.code], chap->auth.in.hdr.id, 577 chap->auth.id); 578 mbuf_Free(bp); 579 return NULL; 580 } 581 chap->auth.id = chap->auth.in.hdr.id; /* We respond with this id */ 582 583 #ifdef HAVE_DES 584 lanman = 0; 585 #endif 586 switch (chap->auth.in.hdr.code) { 587 case CHAP_CHALLENGE: 588 bp = mbuf_Read(bp, &alen, 1); 589 len -= alen + 1; 590 if (len < 0) { 591 log_Printf(LogERROR, "Chap Input: Truncated challenge !\n"); 592 mbuf_Free(bp); 593 return NULL; 594 } 595 *chap->challenge.peer = alen; 596 bp = mbuf_Read(bp, chap->challenge.peer + 1, alen); 597 bp = auth_ReadName(&chap->auth, bp, len); 598 #ifdef HAVE_DES 599 lanman = p->link.lcp.his_authtype == 0x80 && 600 ((chap->NTRespSent && IsAccepted(p->link.lcp.cfg.chap80lm)) || 601 !IsAccepted(p->link.lcp.cfg.chap80nt)); 602 #endif 603 break; 604 605 case CHAP_RESPONSE: 606 auth_StopTimer(&chap->auth); 607 bp = mbuf_Read(bp, &alen, 1); 608 len -= alen + 1; 609 if (len < 0) { 610 log_Printf(LogERROR, "Chap Input: Truncated response !\n"); 611 mbuf_Free(bp); 612 return NULL; 613 } 614 if ((ans = malloc(alen + 2)) == NULL) { 615 log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 616 mbuf_Free(bp); 617 return NULL; 618 } 619 *ans = chap->auth.id; 620 bp = mbuf_Read(bp, ans + 1, alen); 621 ans[alen+1] = '\0'; 622 bp = auth_ReadName(&chap->auth, bp, len); 623 #ifdef HAVE_DES 624 lanman = alen == 49 && ans[alen] == 0; 625 #endif 626 break; 627 628 case CHAP_SUCCESS: 629 case CHAP_FAILURE: 630 /* chap->auth.in.name is already set up at CHALLENGE time */ 631 if ((ans = malloc(len + 1)) == NULL) { 632 log_Printf(LogERROR, "Chap Input: Out of memory !\n"); 633 mbuf_Free(bp); 634 return NULL; 635 } 636 bp = mbuf_Read(bp, ans, len); 637 ans[len] = '\0'; 638 break; 639 } 640 641 switch (chap->auth.in.hdr.code) { 642 case CHAP_CHALLENGE: 643 case CHAP_RESPONSE: 644 if (*chap->auth.in.name) 645 log_Printf(LogPHASE, "Chap Input: %s (%d bytes from %s%s)\n", 646 chapcodes[chap->auth.in.hdr.code], alen, 647 chap->auth.in.name, 648 #ifdef HAVE_DES 649 lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 650 " - lanman" : 651 #endif 652 ""); 653 else 654 log_Printf(LogPHASE, "Chap Input: %s (%d bytes%s)\n", 655 chapcodes[chap->auth.in.hdr.code], alen, 656 #ifdef HAVE_DES 657 lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ? 658 " - lanman" : 659 #endif 660 ""); 661 break; 662 663 case CHAP_SUCCESS: 664 case CHAP_FAILURE: 665 if (*ans) 666 log_Printf(LogPHASE, "Chap Input: %s (%s)\n", 667 chapcodes[chap->auth.in.hdr.code], ans); 668 else 669 log_Printf(LogPHASE, "Chap Input: %s\n", 670 chapcodes[chap->auth.in.hdr.code]); 671 break; 672 } 673 674 switch (chap->auth.in.hdr.code) { 675 case CHAP_CHALLENGE: 676 if (*bundle->cfg.auth.key == '!') 677 chap_StartChild(chap, bundle->cfg.auth.key + 1, 678 bundle->cfg.auth.name); 679 else 680 chap_Respond(chap, bundle->cfg.auth.name, 681 bundle->cfg.auth.key, p->link.lcp.his_authtype 682 #ifdef HAVE_DES 683 , lanman 684 #endif 685 ); 686 break; 687 688 case CHAP_RESPONSE: 689 name = chap->auth.in.name; 690 nlen = strlen(name); 691 #ifndef NORADIUS 692 if (*bundle->radius.cfg.file) { 693 u_char end; 694 695 end = chap->challenge.local[*chap->challenge.local+1]; 696 chap->challenge.local[*chap->challenge.local+1] = '\0'; 697 radius_Authenticate(&bundle->radius, &chap->auth, 698 chap->auth.in.name, ans, 699 chap->challenge.local + 1); 700 chap->challenge.local[*chap->challenge.local+1] = end; 701 } else 702 #endif 703 { 704 key = auth_GetSecret(bundle, name, nlen, p); 705 if (key) { 706 char *myans; 707 #ifdef HAVE_DES 708 if (lanman && !IsEnabled(p->link.lcp.cfg.chap80lm)) { 709 log_Printf(LogPHASE, "Auth failure: LANMan not enabled\n"); 710 if (chap_HaveAnotherGo(chap)) 711 break; 712 key = NULL; 713 } else if (!lanman && !IsEnabled(p->link.lcp.cfg.chap80nt) && 714 p->link.lcp.want_authtype == 0x80) { 715 log_Printf(LogPHASE, "Auth failure: mschap not enabled\n"); 716 if (chap_HaveAnotherGo(chap)) 717 break; 718 key = NULL; 719 } else 720 #endif 721 { 722 myans = chap_BuildAnswer(name, key, chap->auth.id, 723 chap->challenge.local, 724 p->link.lcp.want_authtype 725 #ifdef HAVE_DES 726 , lanman 727 #endif 728 ); 729 if (myans == NULL) 730 key = NULL; 731 else { 732 if (!chap_Cmp(p->link.lcp.want_authtype, myans + 1, *myans, 733 ans + 1, alen 734 #ifdef HAVE_DES 735 , lanman 736 #endif 737 )) 738 key = NULL; 739 free(myans); 740 } 741 } 742 } 743 744 if (key) 745 chap_Success(&chap->auth); 746 else 747 chap_Failure(&chap->auth); 748 } 749 750 break; 751 752 case CHAP_SUCCESS: 753 if (p->link.lcp.auth_iwait == PROTO_CHAP) { 754 p->link.lcp.auth_iwait = 0; 755 if (p->link.lcp.auth_ineed == 0) 756 /* 757 * We've succeeded in our ``login'' 758 * If we're not expecting the peer to authenticate (or he already 759 * has), proceed to network phase. 760 */ 761 datalink_AuthOk(p->dl); 762 } 763 break; 764 765 case CHAP_FAILURE: 766 datalink_AuthNotOk(p->dl); 767 break; 768 } 769 free(ans); 770 } 771 772 mbuf_Free(bp); 773 return NULL; 774 } 775