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