pppd/plugins/winbind.c

   1 /***********************************************************************
   2 *
   3 * winbind.c
   4 *
   5 * WINBIND plugin for pppd.  Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
   6 * authentication using WINBIND to contact a NT-style PDC.
   7 *
   8 * Based on the structure of the radius module.
   9 *
  10 * Copyright (C) 2003 Andrew Bartlet <abartlet@samba.org>
  11 *
  12 * Copyright 1999 Paul Mackerras, Alan Curry.
  13 * (pipe read code from passpromt.c)
  14 *
  15 * Copyright (C) 2002 Roaring Penguin Software Inc.
  16 *
  17 * Based on a patch for ipppd, which is:
  18 *    Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
  19 *    Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
  20 *    Copyright (C) 1997, Miguel A.L. Paraz <map@iphil.net>
  21 *
  22 * Uses radiusclient library, which is:
  23 *    Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
  24 *    Copyright (C) 2002 Roaring Penguin Software Inc.
  25 *
  26 * MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
  27 * modification from Frank Cusack, <frank@google.com>.
  28 *
  29 * Updated on 2003-12-12 to support updated PPP plugin API from latest CVS
  30 *    Copyright (C) 2003, Sean E. Millichamp <sean at bruenor dot org>
  31 *
  32 * This plugin may be distributed according to the terms of the GNU
  33 * General Public License, version 2 or (at your option) any later version.
  34 *
  35 ***********************************************************************/
  36
  37 #ifdef HAVE_CONFIG_H
  38 #include "config.h"
  39 #endif
  40
  41 #include "pppd.h"
  42 #include "chap-new.h"
  43 #include "chap_ms.h"
  44 #include "fsm.h"
  45 #include "ipcp.h"
  46 #include "mppe.h"
  47 #include <syslog.h>
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50 #include <fcntl.h>
  51 #include <sys/time.h>
  52 #include <sys/wait.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <stdlib.h>
  56 #include <errno.h>
  57 #include <ctype.h>
  58
  59 #define BUF_LEN 1024
  60
  61 #define NOT_AUTHENTICATED 0
  62 #define AUTHENTICATED 1
  63
  64 static char *ntlm_auth = NULL;
  65
  66 static int set_ntlm_auth(char **argv)
  67 {
  68         char *p;
  69
  70         p = argv[0];
  71         if (p[0] != '/') {
  72                 option_error("ntlm_auth-helper argument must be full path");
  73                 return 0;
  74         }
  75         p = strdup(p);
  76         if (p == NULL) {
  77                 novm("ntlm_auth-helper argument");
  78                 return 0;
  79         }
  80         if (ntlm_auth != NULL)
  81                 free(ntlm_auth);
  82         ntlm_auth = p;
  83         return 1;
  84 }
  85
  86 static option_t Options[] = {
  87         { "ntlm_auth-helper", o_special, (void *) &set_ntlm_auth,
  88           "Path to ntlm_auth executable", OPT_PRIV },
  89         { NULL }
  90 };
  91
  92 static int
  93 winbind_secret_check(void);
  94
  95 static int winbind_pap_auth(char *user,
  96                            char *passwd,
  97                            char **msgp,
  98                            struct wordlist **paddrs,
  99                            struct wordlist **popts);
 100 static int winbind_chap_verify(char *user, char *ourname, int id,
 101                                struct chap_digest_type *digest,
 102                                unsigned char *challenge,
 103                                unsigned char *response,
 104                                char *message, int message_space);
 105 static int winbind_allowed_address(u_int32_t addr);
 106
 107 char pppd_version[] = VERSION;
 108
 109 /**********************************************************************
 110 * %FUNCTION: plugin_init
 111 * %ARGUMENTS:
 112 *  None
 113 * %RETURNS:
 114 *  Nothing
 115 * %DESCRIPTION:
 116 *  Initializes WINBIND plugin.
 117 ***********************************************************************/
 118 void
 119 plugin_init(void)
 120 {
 121     pap_check_hook = winbind_secret_check;
 122     pap_auth_hook = winbind_pap_auth;
 123
 124     chap_check_hook = winbind_secret_check;
 125     chap_verify_hook = winbind_chap_verify;
 126
 127     allowed_address_hook = winbind_allowed_address;
 128
 129     /* Don't ask the peer for anything other than MS-CHAP or MS-CHAP V2 */
 130     chap_mdtype_all &= (MDTYPE_MICROSOFT_V2 | MDTYPE_MICROSOFT);
 131
 132     add_options(Options);
 133
 134     info("WINBIND plugin initialized.");
 135 }
 136
 137 /**
 138  Routine to get hex characters and turn them into a 16 byte array.
 139  the array can be variable length, and any non-hex-numeric
 140  characters are skipped.  "0xnn" or "0Xnn" is specially catered
 141  for.
 142
 143  valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
 144
 145 **/
 146
 147 /*
 148    Unix SMB/CIFS implementation.
 149    Samba utility functions
 150
 151    Copyright (C) Andrew Tridgell 1992-2001
 152    Copyright (C) Simo Sorce      2001-2002
 153    Copyright (C) Martin Pool     2003
 154
 155    This program is free software; you can redistribute it and/or modify
 156    it under the terms of the GNU General Public License as published by
 157    the Free Software Foundation; either version 2 of the License, or
 158    (at your option) any later version.
 159
 160    This program is distributed in the hope that it will be useful,
 161    but WITHOUT ANY WARRANTY; without even the implied warranty of
 162    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 163    GNU General Public License for more details.
 164
 165    You should have received a copy of the GNU General Public License
 166    along with this program; if not, write to the Free Software
 167    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 168 */
 169
 170 size_t strhex_to_str(unsigned char *p, size_t len, const char *strhex)
 171 {
 172         size_t i;
 173         size_t num_chars = 0;
 174         unsigned char   lonybble, hinybble;
 175         const char     *hexchars = "0123456789ABCDEF";
 176         char           *p1 = NULL, *p2 = NULL;
 177
 178         for (i = 0; i < len && strhex[i] != 0; i++) {
 179                 if (strncmp(hexchars, "0x", 2) == 0) {
 180                         i++; /* skip two chars */
 181                         continue;
 182                 }
 183
 184                 if (!(p1 = strchr(hexchars, toupper(strhex[i]))))
 185                         break;
 186
 187                 i++; /* next hex digit */
 188
 189                 if (!(p2 = strchr(hexchars, toupper(strhex[i]))))
 190                         break;
 191
 192                 /* get the two nybbles */
 193                 hinybble = (p1 - hexchars);
 194                 lonybble = (p2 - hexchars);
 195
 196                 p[num_chars] = (hinybble << 4) | lonybble;
 197                 num_chars++;
 198
 199                 p1 = NULL;
 200                 p2 = NULL;
 201         }
 202         return num_chars;
 203 }
 204
 205 static const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 206
 207 /**
 208  * Encode a base64 string into a malloc()ed string caller to free.
 209  *
 210  *From SQUID: adopted from http://ftp.sunet.se/pub2/gnu/vm/base64-encode.c with adjustments
 211  **/
 212 char * base64_encode(const char *data)
 213 {
 214         size_t out_cnt = 0;
 215         size_t len = strlen(data);
 216         size_t output_len = 4 * ((len + 2) / 3) + 2;
 217         const unsigned char *ptr = (const unsigned char *) data;
 218         char *result = malloc(output_len); /* get us plenty of space */
 219         unsigned int bits;
 220
 221         for (; len >= 3; len -= 3) {
 222                 bits = (ptr[0] << 16) + (ptr[1] << 8) + ptr[2];
 223                 ptr += 3;
 224                 result[out_cnt++] = b64[bits >> 18];
 225                 result[out_cnt++] = b64[(bits >> 12) & 0x3f];
 226                 result[out_cnt++] = b64[(bits >> 6) & 0x3f];
 227                 result[out_cnt++] = b64[bits & 0x3f];
 228         }
 229         if (len != 0) {
 230                 bits = ptr[0] << 16;
 231                 if (len > 1)
 232                         bits |= ptr[1] << 8;
 233                 result[out_cnt++] = b64[bits >> 18];
 234                 result[out_cnt++] = b64[(bits >> 12) & 0x3f];
 235                 result[out_cnt++] = (len > 1)? b64[(bits >> 6) & 0x3f]: '=';
 236                 result[out_cnt++] = '=';
 237         }
 238
 239         result[out_cnt] = '\0'; /* terminate */
 240         return result;
 241 }
 242
 243 unsigned int run_ntlm_auth(const char *username,
 244                            const char *domain,
 245                            const char *full_username,
 246                            const char *plaintext_password,
 247                            const u_char *challenge,
 248                            size_t challenge_length,
 249                            const u_char *lm_response,
 250                            size_t lm_response_length,
 251                            const u_char *nt_response,
 252                            size_t nt_response_length,
 253                            u_char nt_key[16],
 254                            char **error_string)
 255 {
 256
 257         pid_t forkret;
 258         int child_in[2];
 259         int child_out[2];
 260         int status;
 261
 262         int authenticated = NOT_AUTHENTICATED; /* not auth */
 263         int got_user_session_key = 0; /* not got key */
 264
 265         char buffer[1024];
 266
 267         FILE *pipe_in;
 268         FILE *pipe_out;
 269
 270         int i;
 271         char *challenge_hex;
 272         char *lm_hex_hash;
 273         char *nt_hex_hash;
 274
 275         /* First see if we have a program to run... */
 276         if (ntlm_auth == NULL)
 277                 return NOT_AUTHENTICATED;
 278
 279         /* Make first child */
 280         if (pipe(child_out) == -1) {
 281                 error("pipe creation failed for child OUT!");
 282                 return NOT_AUTHENTICATED;
 283         }
 284
 285         if (pipe(child_in) == -1) {
 286                 error("pipe creation failed for child IN!");
 287                 return NOT_AUTHENTICATED;
 288         }
 289
 290         forkret = safe_fork(child_in[0], child_out[1], 2);
 291         if (forkret == -1) {
 292                 if (error_string) {
 293                         *error_string = strdup("fork failed!");
 294                 }
 295
 296                 return NOT_AUTHENTICATED;
 297         }
 298
 299         if (forkret == 0) {
 300                 /* child process */
 301                 uid_t uid;
 302                 gid_t gid;
 303
 304                 close(child_out[0]);
 305                 close(child_in[1]);
 306
 307                 /* run winbind as the user that invoked pppd */
 308                 gid = getgid();
 309                 if (setgid(gid) == -1 || getgid() != gid) {
 310                         fatal("pppd/winbind: could not setgid to %d: %m", gid);
 311                 }
 312                 uid = getuid();
 313                 if (setuid(uid) == -1 || getuid() != uid) {
 314                         fatal("pppd/winbind: could not setuid to %d: %m", uid);
 315                 }
 316                 execl("/bin/sh", "sh", "-c", ntlm_auth, NULL);
 317                 fatal("pppd/winbind: could not exec /bin/sh: %m");
 318         }
 319
 320         /* parent */
 321         close(child_out[1]);
 322         close(child_in[0]);
 323
 324         /* Need to write the User's info onto the pipe */
 325
 326         pipe_in = fdopen(child_in[1], "w");
 327
 328         pipe_out = fdopen(child_out[0], "r");
 329
 330         /* look for session key coming back */
 331
 332         if (username) {
 333                 char *b64_username = base64_encode(username);
 334                 fprintf(pipe_in, "Username:: %s\n", b64_username);
 335                 free(b64_username);
 336         }
 337
 338         if (domain) {
 339                 char *b64_domain = base64_encode(domain);
 340                 fprintf(pipe_in, "NT-Domain:: %s\n", b64_domain);
 341                 free(b64_domain);
 342         }
 343
 344         if (full_username) {
 345                 char *b64_full_username = base64_encode(full_username);
 346                 fprintf(pipe_in, "Full-Username:: %s\n", b64_full_username);
 347                 free(b64_full_username);
 348         }
 349
 350         if (plaintext_password) {
 351                 char *b64_plaintext_password = base64_encode(plaintext_password);
 352                 fprintf(pipe_in, "Password:: %s\n", b64_plaintext_password);
 353                 free(b64_plaintext_password);
 354         }
 355
 356         if (challenge_length) {
 357                 fprintf(pipe_in, "Request-User-Session-Key: yes\n");
 358
 359                 challenge_hex = malloc(challenge_length*2+1);
 360
 361                 for (i = 0; i < challenge_length; i++)
 362                         sprintf(challenge_hex + i * 2, "%02X", challenge[i]);
 363
 364                 fprintf(pipe_in, "LANMAN-Challenge: %s\n", challenge_hex);
 365                 free(challenge_hex);
 366         }
 367
 368         if (lm_response_length) {
 369                 lm_hex_hash = malloc(lm_response_length*2+1);
 370
 371                 for (i = 0; i < lm_response_length; i++)
 372                         sprintf(lm_hex_hash + i * 2, "%02X", lm_response[i]);
 373
 374                 fprintf(pipe_in, "LANMAN-response: %s\n", lm_hex_hash);
 375                 free(lm_hex_hash);
 376         }
 377
 378         if (nt_response_length) {
 379                 nt_hex_hash = malloc(nt_response_length*2+1);
 380
 381                 for (i = 0; i < nt_response_length; i++)
 382                         sprintf(nt_hex_hash + i * 2, "%02X", nt_response[i]);
 383
 384                 fprintf(pipe_in, "NT-response: %s\n", nt_hex_hash);
 385                 free(nt_hex_hash);
 386         }
 387
 388         fprintf(pipe_in, ".\n");
 389         fflush(pipe_in);
 390
 391         while (fgets(buffer, sizeof(buffer)-1, pipe_out) != NULL) {
 392                 char *message, *parameter;
 393                 if (buffer[strlen(buffer)-1] != '\n') {
 394                         break;
 395                 }
 396                 buffer[strlen(buffer)-1] = '\0';
 397                 message = buffer;
 398
 399                 if (!(parameter = strstr(buffer, ": "))) {
 400                         break;
 401                 }
 402
 403                 parameter[0] = '\0';
 404                 parameter++;
 405                 parameter[0] = '\0';
 406                 parameter++;
 407
 408                 if (strcmp(message, ".") == 0) {
 409                         /* end of sequence */
 410                         break;
 411                 } else if (strcasecmp(message, "Authenticated") == 0) {
 412                         if (strcasecmp(parameter, "Yes") == 0) {
 413                                 authenticated = AUTHENTICATED;
 414                         } else {
 415                                 notice("Winbind has declined authentication for user!");
 416                                 authenticated = NOT_AUTHENTICATED;
 417                         }
 418                 } else if (strcasecmp(message, "User-session-key") == 0) {
 419                         /* length is the number of characters to parse */
 420                         if (nt_key) {
 421                                 if (strhex_to_str(nt_key, 32, parameter) == 16) {
 422                                         got_user_session_key = 1;
 423                                 } else {
 424                                         notice("NT session key for user was not 16 bytes!");
 425                                 }
 426                         }
 427                 } else if (strcasecmp(message, "Error") == 0) {
 428                         authenticated = NOT_AUTHENTICATED;
 429                         if (error_string)
 430                                 *error_string = strdup(parameter);
 431                 } else if (strcasecmp(message, "Authentication-Error") == 0) {
 432                         authenticated = NOT_AUTHENTICATED;
 433                         if (error_string)
 434                                 *error_string = strdup(parameter);
 435                 } else {
 436                         notice("unrecognised input from ntlm_auth helper - %s: %s", message, parameter);
 437                 }
 438         }
 439
 440         /* parent */
 441         if (close(child_out[0]) == -1) {
 442                 close(child_in[1]);
 443                 notice("error closing pipe?!? for child OUT[0]");
 444                 return NOT_AUTHENTICATED;
 445         }
 446
 447        /* parent */
 448         if (close(child_in[1]) == -1) {
 449                 notice("error closing pipe?!? for child IN[1]");
 450                 return NOT_AUTHENTICATED;
 451         }
 452
 453         while ((wait(&status) == -1) && errno == EINTR && !got_sigterm)
 454                 ;
 455
 456         if ((authenticated == AUTHENTICATED) && nt_key && !got_user_session_key) {
 457                 notice("Did not get user session key, despite being authenticated!");
 458                 return NOT_AUTHENTICATED;
 459         }
 460         return authenticated;
 461 }
 462
 463 /**********************************************************************
 464 * %FUNCTION: winbind_secret_check
 465 * %ARGUMENTS:
 466 *  None
 467 * %RETURNS:
 468 *  0 if we don't have an ntlm_auth program to run, otherwise 1.
 469 * %DESCRIPTION:
 470 * Tells pppd that we will try to authenticate the peer, and not to
 471 * worry about looking in /etc/ppp/ *-secrets
 472 ***********************************************************************/
 473 static int
 474 winbind_secret_check(void)
 475 {
 476         return ntlm_auth != NULL;
 477 }
 478
 479 /**********************************************************************
 480 * %FUNCTION: winbind_pap_auth
 481 * %ARGUMENTS:
 482 *  user -- user-name of peer
 483 *  passwd -- password supplied by peer
 484 *  msgp -- Message which will be sent in PAP response
 485 *  paddrs -- set to a list of possible peer IP addresses
 486 *  popts -- set to a list of additional pppd options
 487 * %RETURNS:
 488 *  1 if we can authenticate, -1 if we cannot.
 489 * %DESCRIPTION:
 490 * Performs PAP authentication using WINBIND
 491 ***********************************************************************/
 492 static int
 493 winbind_pap_auth(char *user,
 494                 char *password,
 495                 char **msgp,
 496                 struct wordlist **paddrs,
 497                 struct wordlist **popts)
 498 {
 499         if (run_ntlm_auth(NULL, NULL, user, password, NULL, 0, NULL, 0, NULL, 0, NULL, msgp) == AUTHENTICATED) {
 500                 return 1;
 501         }
 502         return -1;
 503 }
 504
 505 /**********************************************************************
 506 * %FUNCTION: winbind_chap_auth
 507 * %ARGUMENTS:
 508 *  user -- user-name of peer
 509 *  remmd -- hash received from peer
 510 *  remmd_len -- length of remmd
 511 *  cstate -- pppd's chap_state structure
 512 * %RETURNS:
 513 *  AUTHENTICATED (1) if we can authenticate, NOT_AUTHENTICATED (0) if we cannot.
 514 * %DESCRIPTION:
 515 * Performs MS-CHAP and MS-CHAPv2 authentication using WINBIND.
 516 ***********************************************************************/
 517
 518 static int
 519 winbind_chap_verify(char *user, char *ourname, int id,
 520                     struct chap_digest_type *digest,
 521                     unsigned char *challenge,
 522                     unsigned char *response,
 523                     char *message, int message_space)
 524 {
 525         int challenge_len, response_len;
 526         char domainname[256];
 527         char *domain;
 528         char *username;
 529         char *p;
 530         unsigned char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
 531
 532         /* The first byte of each of these strings contains their length */
 533         challenge_len = *challenge++;
 534         response_len = *response++;
 535
 536         /* remove domain from "domain\username" */
 537         if ((username = strrchr(user, '\\')) != NULL)
 538                 ++username;
 539         else
 540                 username = user;
 541
 542         strlcpy(domainname, user, sizeof(domainname));
 543
 544         /* remove domain from "domain\username" */
 545         if ((p = strrchr(domainname, '\\')) != NULL) {
 546                 *p = '\0';
 547                 domain = domainname;
 548         } else {
 549                 domain = NULL;
 550         }
 551
 552         /*  generate MD based on negotiated type */
 553         switch (digest->code) {
 554
 555         case CHAP_MICROSOFT:
 556         {
 557                 char *error_string = NULL;
 558                 u_char *nt_response = NULL;
 559                 u_char *lm_response = NULL;
 560                 int nt_response_size = 0;
 561                 int lm_response_size = 0;
 562                 u_char session_key[16];
 563
 564                 if (response_len != MS_CHAP_RESPONSE_LEN)
 565                         break;                  /* not even the right length */
 566
 567                 /* Determine which part of response to verify against */
 568                 if (response[MS_CHAP_USENT]) {
 569                         nt_response = &response[MS_CHAP_NTRESP];
 570                         nt_response_size = MS_CHAP_NTRESP_LEN;
 571                 } else {
 572 #ifdef MSLANMAN
 573                         lm_response = &response[MS_CHAP_LANMANRESP];
 574                         lm_response_size = MS_CHAP_LANMANRESP_LEN;
 575 #else
 576                         /* Should really propagate this into the error packet. */
 577                         notice("Peer request for LANMAN auth not supported");
 578                         return NOT_AUTHENTICATED;
 579 #endif /* MSLANMAN */
 580                 }
 581
 582                 /* ship off to winbind, and check */
 583
 584                 if (run_ntlm_auth(username,
 585                                   domain,
 586                                   NULL,
 587                                   NULL,
 588                                   challenge, challenge_len,
 589                                   lm_response, lm_response_size,
 590                                   nt_response, nt_response_size,
 591                                   session_key,
 592                                   &error_string) == AUTHENTICATED) {
 593 #ifdef MPPE
 594                         mppe_set_chapv1(challenge, session_key);
 595 #endif
 596                         slprintf(message, message_space, "Access granted");
 597                         return AUTHENTICATED;
 598
 599                 } else {
 600                         if (error_string) {
 601                                 notice(error_string);
 602                                 free(error_string);
 603                         }
 604                         slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0",
 605                                  challenge_len, challenge);
 606                         return NOT_AUTHENTICATED;
 607                 }
 608                 break;
 609         }
 610
 611         case CHAP_MICROSOFT_V2:
 612         {
 613                 u_char Challenge[8];
 614                 u_char session_key[MD4_SIGNATURE_SIZE];
 615                 char *error_string = NULL;
 616
 617                 if (response_len != MS_CHAP2_RESPONSE_LEN)
 618                         break;                  /* not even the right length */
 619
 620                 ChallengeHash(&response[MS_CHAP2_PEER_CHALLENGE], challenge,
 621                               user, Challenge);
 622
 623                 /* ship off to winbind, and check */
 624
 625                 if (run_ntlm_auth(username,
 626                                   domain,
 627                                   NULL,
 628                                   NULL,
 629                                   Challenge, 8,
 630                                   NULL, 0,
 631                                   &response[MS_CHAP2_NTRESP],
 632                                   MS_CHAP2_NTRESP_LEN,
 633                                   session_key,
 634                                   &error_string) == AUTHENTICATED) {
 635
 636                         GenerateAuthenticatorResponse(session_key,
 637                                 &response[MS_CHAP2_NTRESP],
 638                                 &response[MS_CHAP2_PEER_CHALLENGE],
 639                                 challenge, user, saresponse);
 640 #ifdef MPPE
 641                         mppe_set_chapv2(session_key, &response[MS_CHAP2_NTRESP],
 642                                        MS_CHAP2_AUTHENTICATOR);
 643 #endif
 644                         if (response[MS_CHAP2_FLAGS]) {
 645                                 slprintf(message, message_space, "S=%s", saresponse);
 646                         } else {
 647                                 slprintf(message, message_space, "S=%s M=%s",
 648                                          saresponse, "Access granted");
 649                         }
 650                         return AUTHENTICATED;
 651
 652                 } else {
 653                         if (error_string) {
 654                                 notice(error_string);
 655                                 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
 656                                          challenge_len, challenge, error_string);
 657                                 free(error_string);
 658                         } else {
 659                                 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
 660                                          challenge_len, challenge, "Access denied");
 661                         }
 662                         return NOT_AUTHENTICATED;
 663                 }
 664                 break;
 665         }
 666
 667         default:
 668                 error("WINBIND: Challenge type %u unsupported", digest->code);
 669         }
 670         return NOT_AUTHENTICATED;
 671 }
 672
 673 static int
 674 winbind_allowed_address(u_int32_t addr)
 675 {
 676         ipcp_options *wo = &ipcp_wantoptions[0];
 677         if (wo->hisaddr !=0 && wo->hisaddr == addr) {
 678                 return 1;
 679         }
 680         return -1;
 681 }