lib/libradius/radlib.c

   1 /*-
   2  * Copyright 1998 Juniper Networks, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $FreeBSD: src/lib/libradius/radlib.c,v 1.4.2.3 2002/06/17 02:24:57 brian Exp $
  27  *      $DragonFly: src/lib/libradius/radlib.c,v 1.4 2005/04/20 20:45:57 joerg Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/socket.h>
  32 #include <sys/time.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35
  36 #include <errno.h>
  37 #include <md5.h>
  38 #include <netdb.h>
  39 #include <stdarg.h>
  40 #include <stddef.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "radlib_private.h"
  47
  48 static void      clear_password(struct rad_handle *);
  49 static void      generr(struct rad_handle *, const char *, ...)
  50                     __printflike(2, 3);
  51 static void      insert_scrambled_password(struct rad_handle *, int);
  52 static void      insert_request_authenticator(struct rad_handle *, int);
  53 static int       is_valid_response(struct rad_handle *, int,
  54                     const struct sockaddr_in *);
  55 static int       put_password_attr(struct rad_handle *, int,
  56                     const void *, size_t);
  57 static int       put_raw_attr(struct rad_handle *, int,
  58                     const void *, size_t);
  59 static int       split(char *, const char *[], int, char *, size_t);
  60
  61 static void
  62 clear_password(struct rad_handle *h)
  63 {
  64         if (h->pass_len != 0) {
  65                 memset(h->pass, 0, h->pass_len);
  66                 h->pass_len = 0;
  67         }
  68         h->pass_pos = 0;
  69 }
  70
  71 static void
  72 generr(struct rad_handle *h, const char *format, ...)
  73 {
  74         va_list          ap;
  75
  76         va_start(ap, format);
  77         vsnprintf(h->errmsg, ERRSIZE, format, ap);
  78         va_end(ap);
  79 }
  80
  81 static void
  82 insert_scrambled_password(struct rad_handle *h, int srv)
  83 {
  84         MD5_CTX ctx;
  85         unsigned char md5[16];
  86         const struct rad_server *srvp;
  87         int padded_len;
  88         int pos;
  89
  90         srvp = &h->servers[srv];
  91         padded_len = h->pass_len == 0 ? 16 : (h->pass_len+15) & ~0xf;
  92
  93         memcpy(md5, &h->request[POS_AUTH], LEN_AUTH);
  94         for (pos = 0;  pos < padded_len;  pos += 16) {
  95                 int i;
  96
  97                 /* Calculate the new scrambler */
  98                 MD5Init(&ctx);
  99                 MD5Update(&ctx, srvp->secret, strlen(srvp->secret));
 100                 MD5Update(&ctx, md5, 16);
 101                 MD5Final(md5, &ctx);
 102
 103                 /*
 104                  * Mix in the current chunk of the password, and copy
 105                  * the result into the right place in the request.  Also
 106                  * modify the scrambler in place, since we will use this
 107                  * in calculating the scrambler for next time.
 108                  */
 109                 for (i = 0;  i < 16;  i++)
 110                         h->request[h->pass_pos + pos + i] =
 111                             md5[i] ^= h->pass[pos + i];
 112         }
 113 }
 114
 115 static void
 116 insert_request_authenticator(struct rad_handle *h, int srv)
 117 {
 118         MD5_CTX ctx;
 119         const struct rad_server *srvp;
 120
 121         srvp = &h->servers[srv];
 122
 123         /* Create the request authenticator */
 124         MD5Init(&ctx);
 125         MD5Update(&ctx, &h->request[POS_CODE], POS_AUTH - POS_CODE);
 126         MD5Update(&ctx, memset(&h->request[POS_AUTH], 0, LEN_AUTH), LEN_AUTH);
 127         MD5Update(&ctx, &h->request[POS_ATTRS], h->req_len - POS_ATTRS);
 128         MD5Update(&ctx, srvp->secret, strlen(srvp->secret));
 129         MD5Final(&h->request[POS_AUTH], &ctx);
 130 }
 131
 132 /*
 133  * Return true if the current response is valid for a request to the
 134  * specified server.
 135  */
 136 static int
 137 is_valid_response(struct rad_handle *h, int srv,
 138     const struct sockaddr_in *from)
 139 {
 140         MD5_CTX ctx;
 141         unsigned char md5[16];
 142         const struct rad_server *srvp;
 143         int len;
 144
 145         srvp = &h->servers[srv];
 146
 147         /* Check the source address */
 148         if (from->sin_family != srvp->addr.sin_family ||
 149             from->sin_addr.s_addr != srvp->addr.sin_addr.s_addr ||
 150             from->sin_port != srvp->addr.sin_port)
 151                 return 0;
 152
 153         /* Check the message length */
 154         if (h->resp_len < POS_ATTRS)
 155                 return 0;
 156         len = h->response[POS_LENGTH] << 8 | h->response[POS_LENGTH+1];
 157         if (len > h->resp_len)
 158                 return 0;
 159
 160         /* Check the response authenticator */
 161         MD5Init(&ctx);
 162         MD5Update(&ctx, &h->response[POS_CODE], POS_AUTH - POS_CODE);
 163         MD5Update(&ctx, &h->request[POS_AUTH], LEN_AUTH);
 164         MD5Update(&ctx, &h->response[POS_ATTRS], len - POS_ATTRS);
 165         MD5Update(&ctx, srvp->secret, strlen(srvp->secret));
 166         MD5Final(md5, &ctx);
 167         if (memcmp(&h->response[POS_AUTH], md5, sizeof md5) != 0)
 168                 return 0;
 169
 170         return 1;
 171 }
 172
 173 static int
 174 put_password_attr(struct rad_handle *h, int type, const void *value, size_t len)
 175 {
 176         int padded_len;
 177         int pad_len;
 178
 179         if (h->pass_pos != 0) {
 180                 generr(h, "Multiple User-Password attributes specified");
 181                 return -1;
 182         }
 183         if (len > PASSSIZE)
 184                 len = PASSSIZE;
 185         padded_len = len == 0 ? 16 : (len+15) & ~0xf;
 186         pad_len = padded_len - len;
 187
 188         /*
 189          * Put in a place-holder attribute containing all zeros, and
 190          * remember where it is so we can fill it in later.
 191          */
 192         clear_password(h);
 193         put_raw_attr(h, type, h->pass, padded_len);
 194         h->pass_pos = h->req_len - padded_len;
 195
 196         /* Save the cleartext password, padded as necessary */
 197         memcpy(h->pass, value, len);
 198         h->pass_len = len;
 199         memset(h->pass + len, 0, pad_len);
 200         return 0;
 201 }
 202
 203 static int
 204 put_raw_attr(struct rad_handle *h, int type, const void *value, size_t len)
 205 {
 206         if (len > 253) {
 207                 generr(h, "Attribute too long");
 208                 return -1;
 209         }
 210         if (h->req_len + 2 + len > MSGSIZE) {
 211                 generr(h, "Maximum message length exceeded");
 212                 return -1;
 213         }
 214         h->request[h->req_len++] = type;
 215         h->request[h->req_len++] = len + 2;
 216         memcpy(&h->request[h->req_len], value, len);
 217         h->req_len += len;
 218         return 0;
 219 }
 220
 221 int
 222 rad_add_server(struct rad_handle *h, const char *host, int port,
 223     const char *secret, int timeout, int tries)
 224 {
 225         struct rad_server *srvp;
 226
 227         if (h->num_servers >= MAXSERVERS) {
 228                 generr(h, "Too many RADIUS servers specified");
 229                 return -1;
 230         }
 231         srvp = &h->servers[h->num_servers];
 232
 233         memset(&srvp->addr, 0, sizeof srvp->addr);
 234         srvp->addr.sin_len = sizeof srvp->addr;
 235         srvp->addr.sin_family = AF_INET;
 236         if (!inet_aton(host, &srvp->addr.sin_addr)) {
 237                 struct hostent *hent;
 238
 239                 if ((hent = gethostbyname(host)) == NULL) {
 240                         generr(h, "%s: host not found", host);
 241                         return -1;
 242                 }
 243                 memcpy(&srvp->addr.sin_addr, hent->h_addr,
 244                     sizeof srvp->addr.sin_addr);
 245         }
 246         if (port != 0)
 247                 srvp->addr.sin_port = htons(port);
 248         else {
 249                 struct servent *sent;
 250
 251                 if (h->type == RADIUS_AUTH)
 252                         srvp->addr.sin_port =
 253                             (sent = getservbyname("radius", "udp")) != NULL ?
 254                                 sent->s_port : htons(RADIUS_PORT);
 255                 else
 256                         srvp->addr.sin_port =
 257                             (sent = getservbyname("radacct", "udp")) != NULL ?
 258                                 sent->s_port : htons(RADACCT_PORT);
 259         }
 260         if ((srvp->secret = strdup(secret)) == NULL) {
 261                 generr(h, "Out of memory");
 262                 return -1;
 263         }
 264         srvp->timeout = timeout;
 265         srvp->max_tries = tries;
 266         srvp->num_tries = 0;
 267         h->num_servers++;
 268         return 0;
 269 }
 270
 271 void
 272 rad_close(struct rad_handle *h)
 273 {
 274         int srv;
 275
 276         if (h->fd != -1)
 277                 close(h->fd);
 278         for (srv = 0;  srv < h->num_servers;  srv++) {
 279                 memset(h->servers[srv].secret, 0,
 280                     strlen(h->servers[srv].secret));
 281                 free(h->servers[srv].secret);
 282         }
 283         clear_password(h);
 284         free(h);
 285 }
 286
 287 int
 288 rad_config(struct rad_handle *h, const char *path)
 289 {
 290         FILE *fp;
 291         char buf[MAXCONFLINE];
 292         int linenum;
 293         int retval;
 294
 295         if (path == NULL)
 296                 path = PATH_RADIUS_CONF;
 297         if ((fp = fopen(path, "r")) == NULL) {
 298                 generr(h, "Cannot open \"%s\": %s", path, strerror(errno));
 299                 return -1;
 300         }
 301         retval = 0;
 302         linenum = 0;
 303         while (fgets(buf, sizeof buf, fp) != NULL) {
 304                 int len;
 305                 const char *fields[5];
 306                 int nfields;
 307                 char msg[ERRSIZE];
 308                 const char *ohost, *secret, *timeout_str, *maxtries_str;
 309                 const char *type, *wanttype;
 310                 char *host;
 311                 char *res;
 312                 char *port_str;
 313                 char *end;
 314                 unsigned long timeout;
 315                 unsigned long maxtries;
 316                 int port;
 317                 int i;
 318
 319                 linenum++;
 320                 len = strlen(buf);
 321                 /* We know len > 0, else fgets would have returned NULL. */
 322                 if (buf[len - 1] != '\n') {
 323                         if (len == sizeof buf - 1)
 324                                 generr(h, "%s:%d: line too long", path,
 325                                     linenum);
 326                         else
 327                                 generr(h, "%s:%d: missing newline", path,
 328                                     linenum);
 329                         retval = -1;
 330                         break;
 331                 }
 332                 buf[len - 1] = '\0';
 333
 334                 /* Extract the fields from the line. */
 335                 nfields = split(buf, fields, 5, msg, sizeof msg);
 336                 if (nfields == -1) {
 337                         generr(h, "%s:%d: %s", path, linenum, msg);
 338                         retval = -1;
 339                         break;
 340                 }
 341                 if (nfields == 0)
 342                         continue;
 343                 /*
 344                  * The first field should contain "auth" or "acct" for
 345                  * authentication or accounting, respectively.  But older
 346                  * versions of the file didn't have that field.  Default
 347                  * it to "auth" for backward compatibility.
 348                  */
 349                 if (strcmp(fields[0], "auth") != 0 &&
 350                     strcmp(fields[0], "acct") != 0) {
 351                         if (nfields >= 5) {
 352                                 generr(h, "%s:%d: invalid service type", path,
 353                                     linenum);
 354                                 retval = -1;
 355                                 break;
 356                         }
 357                         nfields++;
 358                         for (i = nfields;  --i > 0;  )
 359                                 fields[i] = fields[i - 1];
 360                         fields[0] = "auth";
 361                 }
 362                 if (nfields < 3) {
 363                         generr(h, "%s:%d: missing shared secret", path,
 364                             linenum);
 365                         retval = -1;
 366                         break;
 367                 }
 368                 type = fields[0];
 369                 ohost = fields[1];
 370                 secret = fields[2];
 371                 timeout_str = fields[3];
 372                 maxtries_str = fields[4];
 373
 374                 /* Ignore the line if it is for the wrong service type. */
 375                 wanttype = h->type == RADIUS_AUTH ? "auth" : "acct";
 376                 if (strcmp(type, wanttype) != 0)
 377                         continue;
 378
 379                 /* Parse and validate the fields. */
 380                 if ((res = strdup(ohost)) == NULL) {
 381                         generr(h, "%s:%d: malloc failed", path, linenum);
 382                         retval = -1;
 383                         break;
 384                 }
 385                 host = strsep(&res, ":");
 386                 port_str = strsep(&res, ":");
 387                 if (port_str != NULL) {
 388                         port = strtoul(port_str, &end, 10);
 389                         if (*end != '\0') {
 390                                 free(host);
 391                                 generr(h, "%s:%d: invalid port", path,
 392                                     linenum);
 393                                 retval = -1;
 394                                 break;
 395                         }
 396                 } else
 397                         port = 0;
 398                 if (timeout_str != NULL) {
 399                         timeout = strtoul(timeout_str, &end, 10);
 400                         if (*end != '\0') {
 401                                 free(host);
 402                                 generr(h, "%s:%d: invalid timeout", path,
 403                                     linenum);
 404                                 retval = -1;
 405                                 break;
 406                         }
 407                 } else
 408                         timeout = TIMEOUT;
 409                 if (maxtries_str != NULL) {
 410                         maxtries = strtoul(maxtries_str, &end, 10);
 411                         if (*end != '\0') {
 412                                 free(host);
 413                                 generr(h, "%s:%d: invalid maxtries", path,
 414                                     linenum);
 415                                 retval = -1;
 416                                 break;
 417                         }
 418                 } else
 419                         maxtries = MAXTRIES;
 420
 421                 if (rad_add_server(h, host, port, secret, timeout, maxtries) ==
 422                     -1) {
 423                         free(host);
 424                         strcpy(msg, h->errmsg);
 425                         generr(h, "%s:%d: %s", path, linenum, msg);
 426                         retval = -1;
 427                         break;
 428                 }
 429                 free(host);
 430         }
 431         /* Clear out the buffer to wipe a possible copy of a shared secret */
 432         memset(buf, 0, sizeof buf);
 433         fclose(fp);
 434         return retval;
 435 }
 436
 437 /*
 438  * rad_init_send_request() must have previously been called.
 439  * Returns:
 440  *   0     The application should select on *fd with a timeout of tv before
 441  *         calling rad_continue_send_request again.
 442  *   < 0   Failure
 443  *   > 0   Success
 444  */
 445 int
 446 rad_continue_send_request(struct rad_handle *h, int selected, int *fd,
 447                           struct timeval *tv)
 448 {
 449         int n;
 450
 451         if (selected) {
 452                 struct sockaddr_in from;
 453                 int fromlen;
 454
 455                 fromlen = sizeof from;
 456                 h->resp_len = recvfrom(h->fd, h->response,
 457                     MSGSIZE, MSG_WAITALL, (struct sockaddr *)&from, &fromlen);
 458                 if (h->resp_len == -1) {
 459                         generr(h, "recvfrom: %s", strerror(errno));
 460                         return -1;
 461                 }
 462                 if (is_valid_response(h, h->srv, &from)) {
 463                         h->resp_len = h->response[POS_LENGTH] << 8 |
 464                             h->response[POS_LENGTH+1];
 465                         h->resp_pos = POS_ATTRS;
 466                         return h->response[POS_CODE];
 467                 }
 468         }
 469
 470         if (h->try == h->total_tries) {
 471                 generr(h, "No valid RADIUS responses received");
 472                 return -1;
 473         }
 474
 475         /*
 476          * Scan round-robin to the next server that has some
 477          * tries left.  There is guaranteed to be one, or we
 478          * would have exited this loop by now.
 479          */
 480         while (h->servers[h->srv].num_tries >= h->servers[h->srv].max_tries)
 481                 if (++h->srv >= h->num_servers)
 482                         h->srv = 0;
 483
 484         if (h->request[POS_CODE] == RAD_ACCOUNTING_REQUEST)
 485                 /* Insert the request authenticator into the request */
 486                 insert_request_authenticator(h, h->srv);
 487         else
 488                 /* Insert the scrambled password into the request */
 489                 if (h->pass_pos != 0)
 490                         insert_scrambled_password(h, h->srv);
 491
 492         /* Send the request */
 493         n = sendto(h->fd, h->request, h->req_len, 0,
 494             (const struct sockaddr *)&h->servers[h->srv].addr,
 495             sizeof h->servers[h->srv].addr);
 496         if (n != h->req_len) {
 497                 if (n == -1)
 498                         generr(h, "sendto: %s", strerror(errno));
 499                 else
 500                         generr(h, "sendto: short write");
 501                 return -1;
 502         }
 503
 504         h->try++;
 505         h->servers[h->srv].num_tries++;
 506         tv->tv_sec = h->servers[h->srv].timeout;
 507         tv->tv_usec = 0;
 508         *fd = h->fd;
 509
 510         return 0;
 511 }
 512
 513 int
 514 rad_create_request(struct rad_handle *h, int code)
 515 {
 516         int i;
 517
 518         h->request[POS_CODE] = code;
 519         h->request[POS_IDENT] = ++h->ident;
 520         /* Create a random authenticator */
 521         for (i = 0;  i < LEN_AUTH;  i += 2) {
 522                 long r;
 523                 r = random();
 524                 h->request[POS_AUTH+i] = r;
 525                 h->request[POS_AUTH+i+1] = r >> 8;
 526         }
 527         h->req_len = POS_ATTRS;
 528         clear_password(h);
 529         return 0;
 530 }
 531
 532 struct in_addr
 533 rad_cvt_addr(const void *data)
 534 {
 535         struct in_addr value;
 536
 537         memcpy(&value.s_addr, data, sizeof value.s_addr);
 538         return value;
 539 }
 540
 541 u_int32_t
 542 rad_cvt_int(const void *data)
 543 {
 544         u_int32_t value;
 545
 546         memcpy(&value, data, sizeof value);
 547         return ntohl(value);
 548 }
 549
 550 char *
 551 rad_cvt_string(const void *data, size_t len)
 552 {
 553         char *s;
 554
 555         s = malloc(len + 1);
 556         if (s != NULL) {
 557                 memcpy(s, data, len);
 558                 s[len] = '\0';
 559         }
 560         return s;
 561 }
 562
 563 /*
 564  * Returns the attribute type.  If none are left, returns 0.  On failure,
 565  * returns -1.
 566  */
 567 int
 568 rad_get_attr(struct rad_handle *h, const void **value, size_t *len)
 569 {
 570         int type;
 571
 572         if (h->resp_pos >= h->resp_len)
 573                 return 0;
 574         if (h->resp_pos + 2 > h->resp_len) {
 575                 generr(h, "Malformed attribute in response");
 576                 return -1;
 577         }
 578         type = h->response[h->resp_pos++];
 579         *len = h->response[h->resp_pos++] - 2;
 580         if (h->resp_pos + (int)*len > h->resp_len) {
 581                 generr(h, "Malformed attribute in response");
 582                 return -1;
 583         }
 584         *value = &h->response[h->resp_pos];
 585         h->resp_pos += *len;
 586         return type;
 587 }
 588
 589 /*
 590  * Returns -1 on error, 0 to indicate no event and >0 for success
 591  */
 592 int
 593 rad_init_send_request(struct rad_handle *h, int *fd, struct timeval *tv)
 594 {
 595         int srv;
 596
 597         /* Make sure we have a socket to use */
 598         if (h->fd == -1) {
 599                 struct sockaddr_in sin;
 600
 601                 if ((h->fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
 602                         generr(h, "Cannot create socket: %s", strerror(errno));
 603                         return -1;
 604                 }
 605                 memset(&sin, 0, sizeof sin);
 606                 sin.sin_len = sizeof sin;
 607                 sin.sin_family = AF_INET;
 608                 sin.sin_addr.s_addr = INADDR_ANY;
 609                 sin.sin_port = htons(0);
 610                 if (bind(h->fd, (const struct sockaddr *)&sin,
 611                     sizeof sin) == -1) {
 612                         generr(h, "bind: %s", strerror(errno));
 613                         close(h->fd);
 614                         h->fd = -1;
 615                         return -1;
 616                 }
 617         }
 618
 619         if (h->request[POS_CODE] == RAD_ACCOUNTING_REQUEST) {
 620                 /* Make sure no password given */
 621                 if (h->pass_pos || h->chap_pass) {
 622                         generr(h, "User or Chap Password in accounting request");
 623                         return -1;
 624                 }
 625         } else {
 626                 /* Make sure the user gave us a password */
 627                 if (h->pass_pos == 0 && !h->chap_pass) {
 628                         generr(h, "No User or Chap Password attributes given");
 629                         return -1;
 630                 }
 631                 if (h->pass_pos != 0 && h->chap_pass) {
 632                         generr(h, "Both User and Chap Password attributes given");
 633                         return -1;
 634                 }
 635         }
 636
 637         /* Fill in the length field in the message */
 638         h->request[POS_LENGTH] = h->req_len >> 8;
 639         h->request[POS_LENGTH+1] = h->req_len;
 640
 641         /*
 642          * Count the total number of tries we will make, and zero the
 643          * counter for each server.
 644          */
 645         h->total_tries = 0;
 646         for (srv = 0;  srv < h->num_servers;  srv++) {
 647                 h->total_tries += h->servers[srv].max_tries;
 648                 h->servers[srv].num_tries = 0;
 649         }
 650         if (h->total_tries == 0) {
 651                 generr(h, "No RADIUS servers specified");
 652                 return -1;
 653         }
 654
 655         h->try = h->srv = 0;
 656
 657         return rad_continue_send_request(h, 0, fd, tv);
 658 }
 659
 660 /*
 661  * Create and initialize a rad_handle structure, and return it to the
 662  * caller.  Can fail only if the necessary memory cannot be allocated.
 663  * In that case, it returns NULL.
 664  */
 665 struct rad_handle *
 666 rad_auth_open(void)
 667 {
 668         struct rad_handle *h;
 669
 670         h = (struct rad_handle *)malloc(sizeof(struct rad_handle));
 671         if (h != NULL) {
 672                 srandomdev();
 673                 h->fd = -1;
 674                 h->num_servers = 0;
 675                 h->ident = random();
 676                 h->errmsg[0] = '\0';
 677                 memset(h->pass, 0, sizeof h->pass);
 678                 h->pass_len = 0;
 679                 h->pass_pos = 0;
 680                 h->chap_pass = 0;
 681                 h->type = RADIUS_AUTH;
 682         }
 683         return h;
 684 }
 685
 686 struct rad_handle *
 687 rad_acct_open(void)
 688 {
 689         struct rad_handle *h;
 690
 691         h = rad_open();
 692         if (h != NULL)
 693                 h->type = RADIUS_ACCT;
 694         return h;
 695 }
 696
 697 struct rad_handle *
 698 rad_open(void)
 699 {
 700     return rad_auth_open();
 701 }
 702
 703 int
 704 rad_put_addr(struct rad_handle *h, int type, struct in_addr addr)
 705 {
 706         return rad_put_attr(h, type, &addr.s_addr, sizeof addr.s_addr);
 707 }
 708
 709 int
 710 rad_put_attr(struct rad_handle *h, int type, const void *value, size_t len)
 711 {
 712         int result;
 713
 714         if (type == RAD_USER_PASSWORD)
 715                 result = put_password_attr(h, type, value, len);
 716         else {
 717                 result = put_raw_attr(h, type, value, len);
 718                 if (result == 0 && type == RAD_CHAP_PASSWORD)
 719                         h->chap_pass = 1;
 720         }
 721
 722         return result;
 723 }
 724
 725 int
 726 rad_put_int(struct rad_handle *h, int type, u_int32_t value)
 727 {
 728         u_int32_t nvalue;
 729
 730         nvalue = htonl(value);
 731         return rad_put_attr(h, type, &nvalue, sizeof nvalue);
 732 }
 733
 734 int
 735 rad_put_string(struct rad_handle *h, int type, const char *str)
 736 {
 737         return rad_put_attr(h, type, str, strlen(str));
 738 }
 739
 740 /*
 741  * Returns the response type code on success, or -1 on failure.
 742  */
 743 int
 744 rad_send_request(struct rad_handle *h)
 745 {
 746         struct timeval timelimit;
 747         struct timeval tv;
 748         int fd;
 749         int n;
 750
 751         n = rad_init_send_request(h, &fd, &tv);
 752
 753         if (n != 0)
 754                 return n;
 755
 756         gettimeofday(&timelimit, NULL);
 757         timeradd(&tv, &timelimit, &timelimit);
 758
 759         for ( ; ; ) {
 760                 fd_set readfds;
 761
 762                 FD_ZERO(&readfds);
 763                 FD_SET(fd, &readfds);
 764
 765                 n = select(fd + 1, &readfds, NULL, NULL, &tv);
 766
 767                 if (n == -1) {
 768                         generr(h, "select: %s", strerror(errno));
 769                         return -1;
 770                 }
 771
 772                 if (!FD_ISSET(fd, &readfds)) {
 773                         /* Compute a new timeout */
 774                         gettimeofday(&tv, NULL);
 775                         timersub(&timelimit, &tv, &tv);
 776                         if (tv.tv_sec > 0 || (tv.tv_sec == 0 && tv.tv_usec > 0))
 777                                 /* Continue the select */
 778                                 continue;
 779                 }
 780
 781                 n = rad_continue_send_request(h, n, &fd, &tv);
 782
 783                 if (n != 0)
 784                         return n;
 785
 786                 gettimeofday(&timelimit, NULL);
 787                 timeradd(&tv, &timelimit, &timelimit);
 788         }
 789 }
 790
 791 const char *
 792 rad_strerror(struct rad_handle *h)
 793 {
 794         return h->errmsg;
 795 }
 796
 797 /*
 798  * Destructively split a string into fields separated by white space.
 799  * `#' at the beginning of a field begins a comment that extends to the
 800  * end of the string.  Fields may be quoted with `"'.  Inside quoted
 801  * strings, the backslash escapes `\"' and `\\' are honored.
 802  *
 803  * Pointers to up to the first maxfields fields are stored in the fields
 804  * array.  Missing fields get NULL pointers.
 805  *
 806  * The return value is the actual number of fields parsed, and is always
 807  * <= maxfields.
 808  *
 809  * On a syntax error, places a message in the msg string, and returns -1.
 810  */
 811 static int
 812 split(char *str, const char *fields[], int maxfields, char *msg, size_t msglen)
 813 {
 814         char *p;
 815         int i;
 816         static const char ws[] = " \t";
 817
 818         for (i = 0;  i < maxfields;  i++)
 819                 fields[i] = NULL;
 820         p = str;
 821         i = 0;
 822         while (*p != '\0') {
 823                 p += strspn(p, ws);
 824                 if (*p == '#' || *p == '\0')
 825                         break;
 826                 if (i >= maxfields) {
 827                         snprintf(msg, msglen, "line has too many fields");
 828                         return -1;
 829                 }
 830                 if (*p == '"') {
 831                         char *dst;
 832
 833                         dst = ++p;
 834                         fields[i] = dst;
 835                         while (*p != '"') {
 836                                 if (*p == '\\') {
 837                                         p++;
 838                                         if (*p != '"' && *p != '\\' &&
 839                                             *p != '\0') {
 840                                                 snprintf(msg, msglen,
 841                                                     "invalid `\\' escape");
 842                                                 return -1;
 843                                         }
 844                                 }
 845                                 if (*p == '\0') {
 846                                         snprintf(msg, msglen,
 847                                             "unterminated quoted string");
 848                                         return -1;
 849                                 }
 850                                 *dst++ = *p++;
 851                         }
 852                         *dst = '\0';
 853                         p++;
 854                         if (*fields[i] == '\0') {
 855                                 snprintf(msg, msglen,
 856                                     "empty quoted string not permitted");
 857                                 return -1;
 858                         }
 859                         if (*p != '\0' && strspn(p, ws) == 0) {
 860                                 snprintf(msg, msglen, "quoted string not"
 861                                     " followed by white space");
 862                                 return -1;
 863                         }
 864                 } else {
 865                         fields[i] = p;
 866                         p += strcspn(p, ws);
 867                         if (*p != '\0')
 868                                 *p++ = '\0';
 869                 }
 870                 i++;
 871         }
 872         return i;
 873 }
 874
 875 int
 876 rad_get_vendor_attr(u_int32_t *vendor, const void **data, size_t *len)
 877 {
 878         const struct vendor_attribute *attr;
 879
 880         attr = (const struct vendor_attribute *)*data;
 881         *vendor = ntohl(attr->vendor_value);
 882         *data = attr->attrib_data;
 883         *len = attr->attrib_len - 2;
 884
 885         return (attr->attrib_type);
 886 }
 887
 888 int
 889 rad_put_vendor_addr(struct rad_handle *h, int vendor, int type,
 890     struct in_addr addr)
 891 {
 892         return (rad_put_vendor_attr(h, vendor, type, &addr.s_addr,
 893             sizeof addr.s_addr));
 894 }
 895
 896 int
 897 rad_put_vendor_attr(struct rad_handle *h, int vendor, int type,
 898     const void *value, size_t len)
 899 {
 900         struct vendor_attribute *attr;
 901         int res;
 902
 903         if ((attr = malloc(len + 6)) == NULL) {
 904                 generr(h, "malloc failure (%d bytes)", len + 6);
 905                 return -1;
 906         }
 907
 908         attr->vendor_value = htonl(vendor);
 909         attr->attrib_type = type;
 910         attr->attrib_len = len + 2;
 911         memcpy(attr->attrib_data, value, len);
 912
 913         res = put_raw_attr(h, RAD_VENDOR_SPECIFIC, attr, len + 6);
 914         free(attr);
 915         if (res == 0 && vendor == RAD_VENDOR_MICROSOFT
 916             && (type == RAD_MICROSOFT_MS_CHAP_RESPONSE
 917             || type == RAD_MICROSOFT_MS_CHAP2_RESPONSE)) {
 918                 h->chap_pass = 1;
 919         }
 920         return (res);
 921 }
 922
 923 int
 924 rad_put_vendor_int(struct rad_handle *h, int vendor, int type, u_int32_t i)
 925 {
 926         u_int32_t value;
 927
 928         value = htonl(i);
 929         return (rad_put_vendor_attr(h, vendor, type, &value, sizeof value));
 930 }
 931
 932 int
 933 rad_put_vendor_string(struct rad_handle *h, int vendor, int type,
 934     const char *str)
 935 {
 936         return (rad_put_vendor_attr(h, vendor, type, str, strlen(str)));
 937 }
 938
 939 ssize_t
 940 rad_request_authenticator(struct rad_handle *h, char *buf, size_t len)
 941 {
 942         if (len < LEN_AUTH)
 943                 return (-1);
 944         memcpy(buf, h->request + POS_AUTH, LEN_AUTH);
 945         if (len > LEN_AUTH)
 946                 buf[LEN_AUTH] = '\0';
 947         return (LEN_AUTH);
 948 }
 949
 950 const char *
 951 rad_server_secret(struct rad_handle *h)
 952 {
 953         return (h->servers[h->srv].secret);
 954 }