pppd/plugins/radius/radius.c

   1 /***********************************************************************
   2 *
   3 * radius.c
   4 *
   5 * RADIUS plugin for pppd.  Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
   6 * authentication using RADIUS.
   7 *
   8 * Copyright (C) 2002 Roaring Penguin Software Inc.
   9 *
  10 * Based on a patch for ipppd, which is:
  11 *    Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
  12 *    Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
  13 *    Copyright (C) 1997, Miguel A.L. Paraz <map@iphil.net>
  14 *
  15 * Uses radiusclient library, which is:
  16 *    Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
  17 *    Copyright (C) 2002 Roaring Penguin Software Inc.
  18 *
  19 * MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
  20 * modification from Frank Cusack, <frank@google.com>.
  21 *
  22 * This plugin may be distributed according to the terms of the GNU
  23 * General Public License, version 2 or (at your option) any later version.
  24 *
  25 ***********************************************************************/
  26 static char const RCSID[] =
  27 "$Id: radius.c,v 1.32 2008/05/26 09:18:08 paulus Exp $";
  28
  29 #include "pppd.h"
  30 #include "chap-new.h"
  31 #ifdef CHAPMS
  32 #include "chap_ms.h"
  33 #ifdef MPPE
  34 #include "md5.h"
  35 #endif
  36 #endif
  37 #include "radiusclient.h"
  38 #include "fsm.h"
  39 #include "ipcp.h"
  40 #include <syslog.h>
  41 #include <sys/types.h>
  42 #include <sys/time.h>
  43 #include <string.h>
  44 #include <netinet/in.h>
  45 #include <stdlib.h>
  46
  47 #define BUF_LEN 1024
  48
  49 #define MD5_HASH_SIZE   16
  50
  51 static char *config_file = NULL;
  52 static int add_avp(char **);
  53 static struct avpopt {
  54     char *vpstr;
  55     struct avpopt *next;
  56 } *avpopt = NULL;
  57 static bool portnummap = 0;
  58
  59 static option_t Options[] = {
  60     { "radius-config-file", o_string, &config_file },
  61     { "avpair", o_special, add_avp },
  62     { "map-to-ttyname", o_bool, &portnummap,
  63         "Set Radius NAS-Port attribute value via libradiusclient library", OPT_PRIO | 1 },
  64     { "map-to-ifname", o_bool, &portnummap,
  65         "Set Radius NAS-Port attribute to number as in interface name (Default)", OPT_PRIOSUB | 0 },
  66     { NULL }
  67 };
  68
  69 static int radius_secret_check(void);
  70 static int radius_pap_auth(char *user,
  71                            char *passwd,
  72                            char **msgp,
  73                            struct wordlist **paddrs,
  74                            struct wordlist **popts);
  75 static int radius_chap_verify(char *user, char *ourname, int id,
  76                               struct chap_digest_type *digest,
  77                               unsigned char *challenge,
  78                               unsigned char *response,
  79                               char *message, int message_space);
  80
  81 static void radius_ip_up(void *opaque, int arg);
  82 static void radius_ip_down(void *opaque, int arg);
  83 static void make_username_realm(char *user);
  84 static int radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
  85                             struct chap_digest_type *digest,
  86                             unsigned char *challenge,
  87                             char *message, int message_space);
  88 static void radius_choose_ip(u_int32_t *addrp);
  89 static int radius_init(char *msg);
  90 static int get_client_port(char *ifname);
  91 static int radius_allowed_address(u_int32_t addr);
  92 static void radius_acct_interim(void *);
  93 #ifdef MPPE
  94 static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
  95                               unsigned char *);
  96 static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info);
  97 #endif
  98
  99 #ifndef MAXSESSIONID
 100 #define MAXSESSIONID 32
 101 #endif
 102
 103 #ifndef MAXCLASSLEN
 104 #define MAXCLASSLEN 500
 105 #endif
 106
 107 struct radius_state {
 108     int accounting_started;
 109     int initialized;
 110     int client_port;
 111     int choose_ip;
 112     int any_ip_addr_ok;
 113     int done_chap_once;
 114     u_int32_t ip_addr;
 115     char user[MAXNAMELEN];
 116     char config_file[MAXPATHLEN];
 117     char session_id[MAXSESSIONID + 1];
 118     time_t start_time;
 119     int acct_interim_interval;
 120     SERVER *authserver;         /* Authentication server to use */
 121     SERVER *acctserver;         /* Accounting server to use */
 122     int class_len;
 123     char class[MAXCLASSLEN];
 124     VALUE_PAIR *avp;    /* Additional (user supplied) vp's to send to server */
 125 };
 126
 127 void (*radius_attributes_hook)(VALUE_PAIR *) = NULL;
 128
 129 /* The pre_auth_hook MAY set authserver and acctserver if it wants.
 130    In that case, they override the values in the radiusclient.conf file */
 131 void (*radius_pre_auth_hook)(char const *user,
 132                              SERVER **authserver,
 133                              SERVER **acctserver) = NULL;
 134
 135 static struct radius_state rstate;
 136
 137 char pppd_version[] = VERSION;
 138
 139 /**********************************************************************
 140 * %FUNCTION: plugin_init
 141 * %ARGUMENTS:
 142 *  None
 143 * %RETURNS:
 144 *  Nothing
 145 * %DESCRIPTION:
 146 *  Initializes RADIUS plugin.
 147 ***********************************************************************/
 148 void
 149 plugin_init(void)
 150 {
 151     pap_check_hook = radius_secret_check;
 152     pap_auth_hook = radius_pap_auth;
 153
 154     chap_check_hook = radius_secret_check;
 155     chap_verify_hook = radius_chap_verify;
 156
 157     ip_choose_hook = radius_choose_ip;
 158     allowed_address_hook = radius_allowed_address;
 159
 160     add_notifier(&ip_up_notifier, radius_ip_up, NULL);
 161     add_notifier(&ip_down_notifier, radius_ip_down, NULL);
 162
 163     memset(&rstate, 0, sizeof(rstate));
 164
 165     strlcpy(rstate.config_file, "/etc/radiusclient/radiusclient.conf",
 166             sizeof(rstate.config_file));
 167
 168     add_options(Options);
 169
 170     info("RADIUS plugin initialized.");
 171 }
 172
 173 /**********************************************************************
 174 * %FUNCTION: add_avp
 175 * %ARGUMENTS:
 176 *  argv -- the <attribute=value> pair to add
 177 * %RETURNS:
 178 *  1
 179 * %DESCRIPTION:
 180 *  Adds an av pair to be passed on to the RADIUS server on each request.
 181 ***********************************************************************/
 182 static int
 183 add_avp(char **argv)
 184 {
 185     struct avpopt *p = malloc(sizeof(struct avpopt));
 186
 187     /* Append to a list of vp's for later parsing */
 188     p->vpstr = strdup(*argv);
 189     p->next = avpopt;
 190     avpopt = p;
 191
 192     return 1;
 193 }
 194
 195 /**********************************************************************
 196 * %FUNCTION: radius_secret_check
 197 * %ARGUMENTS:
 198 *  None
 199 * %RETURNS:
 200 *  1 -- we are ALWAYS willing to supply a secret. :-)
 201 * %DESCRIPTION:
 202 * Tells pppd that we will try to authenticate the peer, and not to
 203 * worry about looking in /etc/ppp/*-secrets
 204 ***********************************************************************/
 205 static int
 206 radius_secret_check(void)
 207 {
 208     return 1;
 209 }
 210
 211 /**********************************************************************
 212 * %FUNCTION: radius_choose_ip
 213 * %ARGUMENTS:
 214 *  addrp -- where to store the IP address
 215 * %RETURNS:
 216 *  Nothing
 217 * %DESCRIPTION:
 218 *  If RADIUS server has specified an IP address, it is stored in *addrp.
 219 ***********************************************************************/
 220 static void
 221 radius_choose_ip(u_int32_t *addrp)
 222 {
 223     if (rstate.choose_ip) {
 224         *addrp = rstate.ip_addr;
 225     }
 226 }
 227
 228 /**********************************************************************
 229 * %FUNCTION: radius_pap_auth
 230 * %ARGUMENTS:
 231 *  user -- user-name of peer
 232 *  passwd -- password supplied by peer
 233 *  msgp -- Message which will be sent in PAP response
 234 *  paddrs -- set to a list of possible peer IP addresses
 235 *  popts -- set to a list of additional pppd options
 236 * %RETURNS:
 237 *  1 if we can authenticate, -1 if we cannot.
 238 * %DESCRIPTION:
 239 * Performs PAP authentication using RADIUS
 240 ***********************************************************************/
 241 static int
 242 radius_pap_auth(char *user,
 243                 char *passwd,
 244                 char **msgp,
 245                 struct wordlist **paddrs,
 246                 struct wordlist **popts)
 247 {
 248     VALUE_PAIR *send, *received;
 249     UINT4 av_type;
 250     int result;
 251     static char radius_msg[BUF_LEN];
 252
 253     radius_msg[0] = 0;
 254     *msgp = radius_msg;
 255
 256     if (radius_init(radius_msg) < 0) {
 257         return 0;
 258     }
 259
 260     /* Put user with potentially realm added in rstate.user */
 261     make_username_realm(user);
 262
 263     if (radius_pre_auth_hook) {
 264         radius_pre_auth_hook(rstate.user,
 265                              &rstate.authserver,
 266                              &rstate.acctserver);
 267     }
 268
 269     send = NULL;
 270     received = NULL;
 271
 272     /* Hack... the "port" is the ppp interface number.  Should really be
 273        the tty */
 274     rstate.client_port = get_client_port(portnummap ? devnam : ifname);
 275
 276     av_type = PW_FRAMED;
 277     rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
 278
 279     av_type = PW_PPP;
 280     rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
 281
 282     rc_avpair_add(&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
 283     rc_avpair_add(&send, PW_USER_PASSWORD, passwd, 0, VENDOR_NONE);
 284     if (*remote_number) {
 285         rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
 286                        VENDOR_NONE);
 287     } else if (ipparam)
 288         rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
 289
 290     /* Add user specified vp's */
 291     if (rstate.avp)
 292         rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
 293
 294     if (rstate.authserver) {
 295         result = rc_auth_using_server(rstate.authserver,
 296                                       rstate.client_port, send,
 297                                       &received, radius_msg, NULL);
 298     } else {
 299         result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL);
 300     }
 301
 302     if (result == OK_RC) {
 303         if (radius_setparams(received, radius_msg, NULL, NULL, NULL, NULL, 0) < 0) {
 304             result = ERROR_RC;
 305         }
 306     }
 307
 308     /* free value pairs */
 309     rc_avpair_free(received);
 310     rc_avpair_free(send);
 311
 312     return (result == OK_RC) ? 1 : 0;
 313 }
 314
 315 /**********************************************************************
 316 * %FUNCTION: radius_chap_verify
 317 * %ARGUMENTS:
 318 *  user -- name of the peer
 319 *  ourname -- name for this machine
 320 *  id -- the ID byte in the challenge
 321 *  digest -- points to the structure representing the digest type
 322 *  challenge -- the challenge string we sent (length in first byte)
 323 *  response -- the response (hash) the peer sent back (length in 1st byte)
 324 *  message -- space for a message to be returned to the peer
 325 *  message_space -- number of bytes available at *message.
 326 * %RETURNS:
 327 *  1 if the response is good, 0 if it is bad
 328 * %DESCRIPTION:
 329 * Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS.
 330 ***********************************************************************/
 331 static int
 332 radius_chap_verify(char *user, char *ourname, int id,
 333                    struct chap_digest_type *digest,
 334                    unsigned char *challenge, unsigned char *response,
 335                    char *message, int message_space)
 336 {
 337     VALUE_PAIR *send, *received;
 338     UINT4 av_type;
 339     static char radius_msg[BUF_LEN];
 340     int result;
 341     int challenge_len, response_len;
 342     u_char cpassword[MAX_RESPONSE_LEN + 1];
 343 #ifdef MPPE
 344     /* Need the RADIUS secret and Request Authenticator to decode MPPE */
 345     REQUEST_INFO request_info, *req_info = &request_info;
 346 #else
 347     REQUEST_INFO *req_info = NULL;
 348 #endif
 349
 350     challenge_len = *challenge++;
 351     response_len = *response++;
 352
 353     radius_msg[0] = 0;
 354
 355     if (radius_init(radius_msg) < 0) {
 356         error("%s", radius_msg);
 357         return 0;
 358     }
 359
 360     /* return error for types we can't handle */
 361     if ((digest->code != CHAP_MD5)
 362 #ifdef CHAPMS
 363         && (digest->code != CHAP_MICROSOFT)
 364         && (digest->code != CHAP_MICROSOFT_V2)
 365 #endif
 366         ) {
 367         error("RADIUS: Challenge type %u unsupported", digest->code);
 368         return 0;
 369     }
 370
 371     /* Put user with potentially realm added in rstate.user */
 372     if (!rstate.done_chap_once) {
 373         make_username_realm(user);
 374         rstate.client_port = get_client_port (portnummap ? devnam : ifname);
 375         if (radius_pre_auth_hook) {
 376             radius_pre_auth_hook(rstate.user,
 377                                  &rstate.authserver,
 378                                  &rstate.acctserver);
 379         }
 380     }
 381
 382     send = received = NULL;
 383
 384     av_type = PW_FRAMED;
 385     rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
 386
 387     av_type = PW_PPP;
 388     rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
 389
 390     rc_avpair_add (&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
 391
 392     /*
 393      * add the challenge and response fields
 394      */
 395     switch (digest->code) {
 396     case CHAP_MD5:
 397         /* CHAP-Challenge and CHAP-Password */
 398         if (response_len != MD5_HASH_SIZE)
 399             return 0;
 400         cpassword[0] = id;
 401         memcpy(&cpassword[1], response, MD5_HASH_SIZE);
 402
 403         rc_avpair_add(&send, PW_CHAP_CHALLENGE,
 404                       challenge, challenge_len, VENDOR_NONE);
 405         rc_avpair_add(&send, PW_CHAP_PASSWORD,
 406                       cpassword, MD5_HASH_SIZE + 1, VENDOR_NONE);
 407         break;
 408
 409 #ifdef CHAPMS
 410     case CHAP_MICROSOFT:
 411     {
 412         /* MS-CHAP-Challenge and MS-CHAP-Response */
 413         u_char *p = cpassword;
 414
 415         if (response_len != MS_CHAP_RESPONSE_LEN)
 416             return 0;
 417         *p++ = id;
 418         /* The idiots use a different field order in RADIUS than PPP */
 419         *p++ = response[MS_CHAP_USENT];
 420         memcpy(p, response, MS_CHAP_LANMANRESP_LEN + MS_CHAP_NTRESP_LEN);
 421
 422         rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
 423                       challenge, challenge_len, VENDOR_MICROSOFT);
 424         rc_avpair_add(&send, PW_MS_CHAP_RESPONSE,
 425                       cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
 426         break;
 427     }
 428
 429     case CHAP_MICROSOFT_V2:
 430     {
 431         /* MS-CHAP-Challenge and MS-CHAP2-Response */
 432         u_char *p = cpassword;
 433
 434         if (response_len != MS_CHAP2_RESPONSE_LEN)
 435             return 0;
 436         *p++ = id;
 437         /* The idiots use a different field order in RADIUS than PPP */
 438         *p++ = response[MS_CHAP2_FLAGS];
 439         memcpy(p, response, (MS_CHAP2_PEER_CHAL_LEN + MS_CHAP2_RESERVED_LEN
 440                              + MS_CHAP2_NTRESP_LEN));
 441
 442         rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
 443                       challenge, challenge_len, VENDOR_MICROSOFT);
 444         rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE,
 445                       cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
 446         break;
 447     }
 448 #endif
 449     }
 450
 451     if (*remote_number) {
 452         rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
 453                        VENDOR_NONE);
 454     } else if (ipparam)
 455         rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
 456
 457     /* Add user specified vp's */
 458     if (rstate.avp)
 459         rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
 460
 461     /*
 462      * make authentication with RADIUS server
 463      */
 464
 465     if (rstate.authserver) {
 466         result = rc_auth_using_server(rstate.authserver,
 467                                       rstate.client_port, send,
 468                                       &received, radius_msg, req_info);
 469     } else {
 470         result = rc_auth(rstate.client_port, send, &received, radius_msg,
 471                          req_info);
 472     }
 473
 474     strlcpy(message, radius_msg, message_space);
 475
 476     if (result == OK_RC) {
 477         if (!rstate.done_chap_once) {
 478             if (radius_setparams(received, radius_msg, req_info, digest,
 479                                  challenge, message, message_space) < 0) {
 480                 error("%s", radius_msg);
 481                 result = ERROR_RC;
 482             } else {
 483                 rstate.done_chap_once = 1;
 484             }
 485         }
 486     }
 487
 488     rc_avpair_free(received);
 489     rc_avpair_free (send);
 490     return (result == OK_RC);
 491 }
 492
 493 /**********************************************************************
 494 * %FUNCTION: make_username_realm
 495 * %ARGUMENTS:
 496 *  user -- the user given to pppd
 497 * %RETURNS:
 498 *  Nothing
 499 * %DESCRIPTION:
 500 *  Copies user into rstate.user.  If it lacks a realm (no "@domain" part),
 501 * then the default realm from the radiusclient config file is added.
 502 ***********************************************************************/
 503 static void
 504 make_username_realm(char *user)
 505 {
 506     char *default_realm;
 507
 508     if ( user != NULL ) {
 509         strlcpy(rstate.user, user, sizeof(rstate.user));
 510     }  else {
 511         rstate.user[0] = 0;
 512     }
 513
 514     default_realm = rc_conf_str("default_realm");
 515
 516     if (!strchr(rstate.user, '@') &&
 517         default_realm &&
 518         (*default_realm != '\0')) {
 519         strlcat(rstate.user, "@", sizeof(rstate.user));
 520         strlcat(rstate.user, default_realm, sizeof(rstate.user));
 521     }
 522 }
 523
 524 /**********************************************************************
 525 * %FUNCTION: radius_setparams
 526 * %ARGUMENTS:
 527 *  vp -- received value-pairs
 528 *  msg -- buffer in which to place error message.  Holds up to BUF_LEN chars
 529 * %RETURNS:
 530 *  >= 0 on success; -1 on failure
 531 * %DESCRIPTION:
 532 *  Parses attributes sent by RADIUS server and sets them in pppd.
 533 ***********************************************************************/
 534 static int
 535 radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
 536                  struct chap_digest_type *digest, unsigned char *challenge,
 537                  char *message, int message_space)
 538 {
 539     u_int32_t remote;
 540     int ms_chap2_success = 0;
 541 #ifdef MPPE
 542     int mppe_enc_keys = 0;      /* whether or not these were received */
 543     int mppe_enc_policy = 0;
 544     int mppe_enc_types = 0;
 545 #endif
 546
 547     /* Send RADIUS attributes to anyone else who might be interested */
 548     if (radius_attributes_hook) {
 549         (*radius_attributes_hook)(vp);
 550     }
 551
 552     /*
 553      * service type (if not framed then quit),
 554      * new IP address (RADIUS can define static IP for some users),
 555      */
 556
 557     while (vp) {
 558         if (vp->vendorcode == VENDOR_NONE) {
 559             switch (vp->attribute) {
 560             case PW_SERVICE_TYPE:
 561                 /* check for service type       */
 562                 /* if not FRAMED then exit      */
 563                 if (vp->lvalue != PW_FRAMED) {
 564                     slprintf(msg, BUF_LEN, "RADIUS: wrong service type %ld for %s",
 565                              vp->lvalue, rstate.user);
 566                     return -1;
 567                 }
 568                 break;
 569
 570             case PW_FRAMED_PROTOCOL:
 571                 /* check for framed protocol type       */
 572                 /* if not PPP then also exit            */
 573                 if (vp->lvalue != PW_PPP) {
 574                     slprintf(msg, BUF_LEN, "RADIUS: wrong framed protocol %ld for %s",
 575                              vp->lvalue, rstate.user);
 576                     return -1;
 577                 }
 578                 break;
 579
 580             case PW_SESSION_TIMEOUT:
 581                 /* Session timeout */
 582                 maxconnect = vp->lvalue;
 583                 break;
 584 #ifdef MAXOCTETS
 585             case PW_SESSION_OCTETS_LIMIT:
 586                 /* Session traffic limit */
 587                 maxoctets = vp->lvalue;
 588                 break;
 589             case PW_OCTETS_DIRECTION:
 590                 /* Session traffic limit direction check */
 591                 maxoctets_dir = ( vp->lvalue > 4 ) ? 0 : vp->lvalue ;
 592                 break;
 593 #endif
 594             case PW_ACCT_INTERIM_INTERVAL:
 595                 /* Send accounting updates every few seconds */
 596                 rstate.acct_interim_interval = vp->lvalue;
 597                 /* RFC says it MUST NOT be less than 60 seconds */
 598                 /* We use "0" to signify not sending updates */
 599                 if (rstate.acct_interim_interval &&
 600                     rstate.acct_interim_interval < 60) {
 601                     rstate.acct_interim_interval = 60;
 602                 }
 603                 break;
 604             case PW_FRAMED_IP_ADDRESS:
 605                 /* seting up remote IP addresses */
 606                 remote = vp->lvalue;
 607                 if (remote == 0xffffffff) {
 608                     /* 0xffffffff means user should be allowed to select one */
 609                     rstate.any_ip_addr_ok = 1;
 610                 } else if (remote != 0xfffffffe) {
 611                     /* 0xfffffffe means NAS should select an ip address */
 612                     remote = htonl(vp->lvalue);
 613                     if (bad_ip_adrs (remote)) {
 614                         slprintf(msg, BUF_LEN, "RADIUS: bad remote IP address %I for %s",
 615                                  remote, rstate.user);
 616                         return -1;
 617                     }
 618                     rstate.choose_ip = 1;
 619                     rstate.ip_addr = remote;
 620                 }
 621                 break;
 622             case PW_CLASS:
 623                 /* Save Class attribute to pass it in accounting request */
 624                 if (vp->lvalue <= MAXCLASSLEN) {
 625                     rstate.class_len=vp->lvalue;
 626                     memcpy(rstate.class, vp->strvalue, rstate.class_len);
 627                 } /* else too big for our buffer - ignore it */
 628                 break;
 629             }
 630
 631
 632 #ifdef CHAPMS
 633         } else if (vp->vendorcode == VENDOR_MICROSOFT) {
 634             switch (vp->attribute) {
 635             case PW_MS_CHAP2_SUCCESS:
 636                 if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) {
 637                     slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet");
 638                     return -1;
 639                 }
 640                 if (message != NULL)
 641                     strlcpy(message, vp->strvalue + 1, message_space);
 642                 ms_chap2_success = 1;
 643                 break;
 644
 645 #ifdef MPPE
 646             case PW_MS_CHAP_MPPE_KEYS:
 647                 if (radius_setmppekeys(vp, req_info, challenge) < 0) {
 648                     slprintf(msg, BUF_LEN,
 649                              "RADIUS: bad MS-CHAP-MPPE-Keys attribute");
 650                     return -1;
 651                 }
 652                 mppe_enc_keys = 1;
 653                 break;
 654
 655             case PW_MS_MPPE_SEND_KEY:
 656             case PW_MS_MPPE_RECV_KEY:
 657                 if (radius_setmppekeys2(vp, req_info) < 0) {
 658                     slprintf(msg, BUF_LEN,
 659                              "RADIUS: bad MS-MPPE-%s-Key attribute",
 660                              (vp->attribute == PW_MS_MPPE_SEND_KEY)?
 661                              "Send": "Recv");
 662                     return -1;
 663                 }
 664                 mppe_enc_keys = 1;
 665                 break;
 666
 667             case PW_MS_MPPE_ENCRYPTION_POLICY:
 668                 mppe_enc_policy = vp->lvalue;   /* save for later */
 669                 break;
 670
 671             case PW_MS_MPPE_ENCRYPTION_TYPES:
 672                 mppe_enc_types = vp->lvalue;    /* save for later */
 673                 break;
 674
 675 #endif /* MPPE */
 676 #if 0
 677             case PW_MS_PRIMARY_DNS_SERVER:
 678             case PW_MS_SECONDARY_DNS_SERVER:
 679             case PW_MS_PRIMARY_NBNS_SERVER:
 680             case PW_MS_SECONDARY_NBNS_SERVER:
 681                 break;
 682 #endif
 683             }
 684 #endif /* CHAPMS */
 685         }
 686         vp = vp->next;
 687     }
 688
 689     /* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */
 690     if (digest && (digest->code == CHAP_MICROSOFT_V2) && !ms_chap2_success)
 691         return -1;
 692
 693 #ifdef MPPE
 694     /*
 695      * Require both policy and key attributes to indicate a valid key.
 696      * Note that if the policy value was '0' we don't set the key!
 697      */
 698     if (mppe_enc_policy && mppe_enc_keys) {
 699         mppe_keys_set = 1;
 700         /* Set/modify allowed encryption types. */
 701         if (mppe_enc_types)
 702             set_mppe_enc_types(mppe_enc_policy, mppe_enc_types);
 703     }
 704 #endif
 705
 706     return 0;
 707 }
 708
 709 #ifdef MPPE
 710 /**********************************************************************
 711 * %FUNCTION: radius_setmppekeys
 712 * %ARGUMENTS:
 713 *  vp -- value pair holding MS-CHAP-MPPE-KEYS attribute
 714 *  req_info -- radius request information used for encryption
 715 * %RETURNS:
 716 *  >= 0 on success; -1 on failure
 717 * %DESCRIPTION:
 718 *  Decrypt the "key" provided by the RADIUS server for MPPE encryption.
 719 *  See RFC 2548.
 720 ***********************************************************************/
 721 static int
 722 radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
 723                    unsigned char *challenge)
 724 {
 725     int i;
 726     MD5_CTX Context;
 727     u_char  plain[32];
 728     u_char  buf[16];
 729
 730     if (vp->lvalue != 32) {
 731         error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys",
 732               vp->lvalue);
 733         return -1;
 734     }
 735
 736     memcpy(plain, vp->strvalue, sizeof(plain));
 737
 738     MD5_Init(&Context);
 739     MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
 740     MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
 741     MD5_Final(buf, &Context);
 742
 743     for (i = 0; i < 16; i++)
 744         plain[i] ^= buf[i];
 745
 746     MD5_Init(&Context);
 747     MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
 748     MD5_Update(&Context, vp->strvalue, 16);
 749     MD5_Final(buf, &Context);
 750
 751     for(i = 0; i < 16; i++)
 752         plain[i + 16] ^= buf[i];
 753
 754     /*
 755      * Annoying.  The "key" returned is just the NTPasswordHashHash, which
 756      * the NAS (us) doesn't need; we only need the start key.  So we have
 757      * to generate the start key, sigh.  NB: We do not support the LM-Key.
 758      */
 759     mppe_set_keys(challenge, &plain[8]);
 760
 761     return 0;
 762 }
 763
 764 /**********************************************************************
 765 * %FUNCTION: radius_setmppekeys2
 766 * %ARGUMENTS:
 767 *  vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute
 768 *  req_info -- radius request information used for encryption
 769 * %RETURNS:
 770 *  >= 0 on success; -1 on failure
 771 * %DESCRIPTION:
 772 *  Decrypt the key provided by the RADIUS server for MPPE encryption.
 773 *  See RFC 2548.
 774 ***********************************************************************/
 775 static int
 776 radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info)
 777 {
 778     int i;
 779     MD5_CTX Context;
 780     u_char  *salt = vp->strvalue;
 781     u_char  *crypt = vp->strvalue + 2;
 782     u_char  plain[32];
 783     u_char  buf[MD5_HASH_SIZE];
 784     char    *type = "Send";
 785
 786     if (vp->attribute == PW_MS_MPPE_RECV_KEY)
 787         type = "Recv";
 788
 789     if (vp->lvalue != 34) {
 790         error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key",
 791               vp->lvalue, type);
 792         return -1;
 793     }
 794
 795     if ((salt[0] & 0x80) == 0) {
 796         error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type);
 797         return -1;
 798     }
 799
 800     memcpy(plain, crypt, 32);
 801
 802     MD5_Init(&Context);
 803     MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
 804     MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
 805     MD5_Update(&Context, salt, 2);
 806     MD5_Final(buf, &Context);
 807
 808     for (i = 0; i < 16; i++)
 809         plain[i] ^= buf[i];
 810
 811     if (plain[0] != sizeof(mppe_send_key) /* 16 */) {
 812         error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute",
 813               (int) plain[0], type);
 814         return -1;
 815     }
 816
 817     MD5_Init(&Context);
 818     MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
 819     MD5_Update(&Context, crypt, 16);
 820     MD5_Final(buf, &Context);
 821
 822     plain[16] ^= buf[0]; /* only need the first byte */
 823
 824     if (vp->attribute == PW_MS_MPPE_SEND_KEY)
 825         memcpy(mppe_send_key, plain + 1, 16);
 826     else
 827         memcpy(mppe_recv_key, plain + 1, 16);
 828
 829     return 0;
 830 }
 831 #endif /* MPPE */
 832
 833 /**********************************************************************
 834 * %FUNCTION: radius_acct_start
 835 * %ARGUMENTS:
 836 *  None
 837 * %RETURNS:
 838 *  Nothing
 839 * %DESCRIPTION:
 840 *  Sends a "start" accounting message to the RADIUS server.
 841 ***********************************************************************/
 842 static void
 843 radius_acct_start(void)
 844 {
 845     UINT4 av_type;
 846     int result;
 847     VALUE_PAIR *send = NULL;
 848     ipcp_options *ho = &ipcp_hisoptions[0];
 849     u_int32_t hisaddr;
 850
 851     if (!rstate.initialized) {
 852         return;
 853     }
 854
 855     rstate.start_time = time(NULL);
 856
 857     strncpy(rstate.session_id, rc_mksid(), sizeof(rstate.session_id));
 858
 859     rc_avpair_add(&send, PW_ACCT_SESSION_ID,
 860                    rstate.session_id, 0, VENDOR_NONE);
 861     rc_avpair_add(&send, PW_USER_NAME,
 862                    rstate.user, 0, VENDOR_NONE);
 863
 864     if (rstate.class_len > 0)
 865         rc_avpair_add(&send, PW_CLASS,
 866                       rstate.class, rstate.class_len, VENDOR_NONE);
 867
 868     av_type = PW_STATUS_START;
 869     rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
 870
 871     av_type = PW_FRAMED;
 872     rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
 873
 874     av_type = PW_PPP;
 875     rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
 876
 877     if (*remote_number) {
 878         rc_avpair_add(&send, PW_CALLING_STATION_ID,
 879                        remote_number, 0, VENDOR_NONE);
 880     } else if (ipparam)
 881         rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
 882
 883     av_type = PW_RADIUS;
 884     rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
 885
 886
 887     av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
 888     rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
 889
 890     hisaddr = ho->hisaddr;
 891     av_type = htonl(hisaddr);
 892     rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
 893
 894     /* Add user specified vp's */
 895     if (rstate.avp)
 896         rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
 897
 898     if (rstate.acctserver) {
 899         result = rc_acct_using_server(rstate.acctserver,
 900                                       rstate.client_port, send);
 901     } else {
 902         result = rc_acct(rstate.client_port, send);
 903     }
 904
 905     rc_avpair_free(send);
 906
 907     if (result != OK_RC) {
 908         /* RADIUS server could be down so make this a warning */
 909         syslog(LOG_WARNING,
 910                 "Accounting START failed for %s", rstate.user);
 911     } else {
 912         rstate.accounting_started = 1;
 913         /* Kick off periodic accounting reports */
 914         if (rstate.acct_interim_interval) {
 915             TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
 916         }
 917     }
 918 }
 919
 920 /**********************************************************************
 921 * %FUNCTION: radius_acct_stop
 922 * %ARGUMENTS:
 923 *  None
 924 * %RETURNS:
 925 *  Nothing
 926 * %DESCRIPTION:
 927 *  Sends a "stop" accounting message to the RADIUS server.
 928 ***********************************************************************/
 929 static void
 930 radius_acct_stop(void)
 931 {
 932     UINT4 av_type;
 933     VALUE_PAIR *send = NULL;
 934     ipcp_options *ho = &ipcp_hisoptions[0];
 935     u_int32_t hisaddr;
 936     int result;
 937
 938     if (!rstate.initialized) {
 939         return;
 940     }
 941
 942     if (!rstate.accounting_started) {
 943         return;
 944     }
 945
 946     if (rstate.acct_interim_interval)
 947         UNTIMEOUT(radius_acct_interim, NULL);
 948
 949     rstate.accounting_started = 0;
 950     rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
 951                    0, VENDOR_NONE);
 952
 953     rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
 954
 955     av_type = PW_STATUS_STOP;
 956     rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
 957
 958     av_type = PW_FRAMED;
 959     rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
 960
 961     av_type = PW_PPP;
 962     rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
 963
 964     av_type = PW_RADIUS;
 965     rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
 966
 967
 968     if (link_stats_valid) {
 969         av_type = link_connect_time;
 970         rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
 971
 972         av_type = link_stats.bytes_out;
 973         rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
 974
 975         av_type = link_stats.bytes_in;
 976         rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
 977
 978         av_type = link_stats.pkts_out;
 979         rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
 980
 981         av_type = link_stats.pkts_in;
 982         rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
 983     }
 984
 985     if (*remote_number) {
 986         rc_avpair_add(&send, PW_CALLING_STATION_ID,
 987                        remote_number, 0, VENDOR_NONE);
 988     } else if (ipparam)
 989         rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
 990
 991     av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
 992     rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
 993
 994     av_type = PW_NAS_ERROR;
 995     switch( status ) {
 996         case EXIT_OK:
 997         case EXIT_USER_REQUEST:
 998             av_type = PW_USER_REQUEST;
 999             break;
1000
1001         case EXIT_HANGUP:
1002         case EXIT_PEER_DEAD:
1003         case EXIT_CONNECT_FAILED:
1004             av_type = PW_LOST_CARRIER;
1005             break;
1006
1007         case EXIT_INIT_FAILED:
1008         case EXIT_OPEN_FAILED:
1009         case EXIT_LOCK_FAILED:
1010         case EXIT_PTYCMD_FAILED:
1011             av_type = PW_PORT_ERROR;
1012             break;
1013
1014         case EXIT_PEER_AUTH_FAILED:
1015         case EXIT_AUTH_TOPEER_FAILED:
1016         case EXIT_NEGOTIATION_FAILED:
1017         case EXIT_CNID_AUTH_FAILED:
1018             av_type = PW_SERVICE_UNAVAILABLE;
1019             break;
1020
1021         case EXIT_IDLE_TIMEOUT:
1022             av_type = PW_ACCT_IDLE_TIMEOUT;
1023             break;
1024
1025         case EXIT_CALLBACK:
1026             av_type = PW_CALLBACK;
1027             break;
1028
1029         case EXIT_CONNECT_TIME:
1030             av_type = PW_ACCT_SESSION_TIMEOUT;
1031             break;
1032
1033 #ifdef MAXOCTETS
1034         case EXIT_TRAFFIC_LIMIT:
1035             av_type = PW_NAS_REQUEST;
1036             break;
1037 #endif
1038
1039         default:
1040             av_type = PW_NAS_ERROR;
1041             break;
1042     }
1043     rc_avpair_add(&send, PW_ACCT_TERMINATE_CAUSE, &av_type, 0, VENDOR_NONE);
1044
1045     hisaddr = ho->hisaddr;
1046     av_type = htonl(hisaddr);
1047     rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1048
1049     /* Add user specified vp's */
1050     if (rstate.avp)
1051         rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1052
1053     if (rstate.acctserver) {
1054         result = rc_acct_using_server(rstate.acctserver,
1055                                       rstate.client_port, send);
1056     } else {
1057         result = rc_acct(rstate.client_port, send);
1058     }
1059
1060     if (result != OK_RC) {
1061         /* RADIUS server could be down so make this a warning */
1062         syslog(LOG_WARNING,
1063                 "Accounting STOP failed for %s", rstate.user);
1064     }
1065     rc_avpair_free(send);
1066 }
1067
1068 /**********************************************************************
1069 * %FUNCTION: radius_acct_interim
1070 * %ARGUMENTS:
1071 *  None
1072 * %RETURNS:
1073 *  Nothing
1074 * %DESCRIPTION:
1075 *  Sends an interim accounting message to the RADIUS server
1076 ***********************************************************************/
1077 static void
1078 radius_acct_interim(void *ignored)
1079 {
1080     UINT4 av_type;
1081     VALUE_PAIR *send = NULL;
1082     ipcp_options *ho = &ipcp_hisoptions[0];
1083     u_int32_t hisaddr;
1084     int result;
1085
1086     if (!rstate.initialized) {
1087         return;
1088     }
1089
1090     if (!rstate.accounting_started) {
1091         return;
1092     }
1093
1094     rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
1095                    0, VENDOR_NONE);
1096
1097     rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
1098
1099     av_type = PW_STATUS_ALIVE;
1100     rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
1101
1102     av_type = PW_FRAMED;
1103     rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
1104
1105     av_type = PW_PPP;
1106     rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
1107
1108     av_type = PW_RADIUS;
1109     rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
1110
1111     /* Update link stats */
1112     update_link_stats(0);
1113
1114     if (link_stats_valid) {
1115         link_stats_valid = 0; /* Force later code to update */
1116
1117         av_type = link_connect_time;
1118         rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
1119
1120         av_type = link_stats.bytes_out;
1121         rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1122
1123         av_type = link_stats.bytes_in;
1124         rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1125
1126         av_type = link_stats.pkts_out;
1127         rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1128
1129         av_type = link_stats.pkts_in;
1130         rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1131     }
1132
1133     if (*remote_number) {
1134         rc_avpair_add(&send, PW_CALLING_STATION_ID,
1135                        remote_number, 0, VENDOR_NONE);
1136     } else if (ipparam)
1137         rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
1138
1139     av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
1140     rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
1141
1142     hisaddr = ho->hisaddr;
1143     av_type = htonl(hisaddr);
1144     rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1145
1146     /* Add user specified vp's */
1147     if (rstate.avp)
1148         rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1149
1150     if (rstate.acctserver) {
1151         result = rc_acct_using_server(rstate.acctserver,
1152                                       rstate.client_port, send);
1153     } else {
1154         result = rc_acct(rstate.client_port, send);
1155     }
1156
1157     if (result != OK_RC) {
1158         /* RADIUS server could be down so make this a warning */
1159         syslog(LOG_WARNING,
1160                 "Interim accounting failed for %s", rstate.user);
1161     }
1162     rc_avpair_free(send);
1163
1164     /* Schedule another one */
1165     TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
1166 }
1167
1168 /**********************************************************************
1169 * %FUNCTION: radius_ip_up
1170 * %ARGUMENTS:
1171 *  opaque -- ignored
1172 *  arg -- ignored
1173 * %RETURNS:
1174 *  Nothing
1175 * %DESCRIPTION:
1176 *  Called when IPCP is up.  We'll do a start-accounting record.
1177 ***********************************************************************/
1178 static void
1179 radius_ip_up(void *opaque, int arg)
1180 {
1181     radius_acct_start();
1182 }
1183
1184 /**********************************************************************
1185 * %FUNCTION: radius_ip_down
1186 * %ARGUMENTS:
1187 *  opaque -- ignored
1188 *  arg -- ignored
1189 * %RETURNS:
1190 *  Nothing
1191 * %DESCRIPTION:
1192 *  Called when IPCP is down.  We'll do a stop-accounting record.
1193 ***********************************************************************/
1194 static void
1195 radius_ip_down(void *opaque, int arg)
1196 {
1197     radius_acct_stop();
1198 }
1199
1200 /**********************************************************************
1201 * %FUNCTION: radius_init
1202 * %ARGUMENTS:
1203 *  msg -- buffer of size BUF_LEN for error message
1204 * %RETURNS:
1205 *  negative on failure; non-negative on success
1206 * %DESCRIPTION:
1207 *  Initializes radiusclient library
1208 ***********************************************************************/
1209 static int
1210 radius_init(char *msg)
1211 {
1212     if (rstate.initialized) {
1213         return 0;
1214     }
1215
1216     if (config_file && *config_file) {
1217         strlcpy(rstate.config_file, config_file, MAXPATHLEN-1);
1218     }
1219
1220     rstate.initialized = 1;
1221
1222     if (rc_read_config(rstate.config_file) != 0) {
1223         slprintf(msg, BUF_LEN, "RADIUS: Can't read config file %s",
1224                  rstate.config_file);
1225         return -1;
1226     }
1227
1228     if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) {
1229         slprintf(msg, BUF_LEN, "RADIUS: Can't read dictionary file %s",
1230                  rc_conf_str("dictionary"));
1231         return -1;
1232     }
1233
1234     if (rc_read_mapfile(rc_conf_str("mapfile")) != 0)   {
1235         slprintf(msg, BUF_LEN, "RADIUS: Can't read map file %s",
1236                  rc_conf_str("mapfile"));
1237         return -1;
1238     }
1239
1240     /* Add av pairs saved during option parsing */
1241     while (avpopt) {
1242         struct avpopt *n = avpopt->next;
1243
1244         rc_avpair_parse(avpopt->vpstr, &rstate.avp);
1245         free(avpopt->vpstr);
1246         free(avpopt);
1247         avpopt = n;
1248     }
1249     return 0;
1250 }
1251
1252 /**********************************************************************
1253 * %FUNCTION: get_client_port
1254 * %ARGUMENTS:
1255 *  ifname -- PPP interface name (e.g. "ppp7")
1256 * %RETURNS:
1257 *  The NAS port number (e.g. 7)
1258 * %DESCRIPTION:
1259 *  Extracts the port number from the interface name
1260 ***********************************************************************/
1261 static int
1262 get_client_port(char *ifname)
1263 {
1264     int port;
1265     if (sscanf(ifname, "ppp%d", &port) == 1) {
1266         return port;
1267     }
1268     return rc_map2id(ifname);
1269 }
1270
1271 /**********************************************************************
1272 * %FUNCTION: radius_allowed_address
1273 * %ARGUMENTS:
1274 *  addr -- IP address
1275 * %RETURNS:
1276 *  1 if we're allowed to use that IP address; 0 if not; -1 if we do
1277 *  not know.
1278 ***********************************************************************/
1279 static int
1280 radius_allowed_address(u_int32_t addr)
1281 {
1282     ipcp_options *wo = &ipcp_wantoptions[0];
1283
1284     if (!rstate.choose_ip) {
1285         /* If RADIUS server said any address is OK, then fine... */
1286         if (rstate.any_ip_addr_ok) {
1287             return 1;
1288         }
1289
1290         /* Sigh... if an address was supplied for remote host in pppd
1291            options, it has to match that.  */
1292         if (wo->hisaddr != 0 && wo->hisaddr == addr) {
1293             return 1;
1294         }
1295
1296         return 0;
1297     }
1298     if (addr == rstate.ip_addr) return 1;
1299     return 0;
1300 }
1301
1302 /* Useful for other plugins */
1303 char *radius_logged_in_user(void)
1304 {
1305     return rstate.user;
1306 }