hostapd/hlr_auc_gw.c

   1 /*
   2  * HLR/AuC testing gateway for hostapd EAP-SIM/AKA database/authenticator
   3  * Copyright (c) 2005-2007, 2012-2013, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  *
   8  * This is an example implementation of the EAP-SIM/AKA database/authentication
   9  * gateway interface to HLR/AuC. It is expected to be replaced with an
  10  * implementation of SS7 gateway to GSM/UMTS authentication center (HLR/AuC) or
  11  * a local implementation of SIM triplet and AKA authentication data generator.
  12  *
  13  * hostapd will send SIM/AKA authentication queries over a UNIX domain socket
  14  * to and external program, e.g., this hlr_auc_gw. This interface uses simple
  15  * text-based format:
  16  *
  17  * EAP-SIM / GSM triplet query/response:
  18  * SIM-REQ-AUTH <IMSI> <max_chal>
  19  * SIM-RESP-AUTH <IMSI> Kc1:SRES1:RAND1 Kc2:SRES2:RAND2 [Kc3:SRES3:RAND3]
  20  * SIM-RESP-AUTH <IMSI> FAILURE
  21  * GSM-AUTH-REQ <IMSI> RAND1:RAND2[:RAND3]
  22  * GSM-AUTH-RESP <IMSI> Kc1:SRES1:Kc2:SRES2[:Kc3:SRES3]
  23  * GSM-AUTH-RESP <IMSI> FAILURE
  24  *
  25  * EAP-AKA / UMTS query/response:
  26  * AKA-REQ-AUTH <IMSI>
  27  * AKA-RESP-AUTH <IMSI> <RAND> <AUTN> <IK> <CK> <RES>
  28  * AKA-RESP-AUTH <IMSI> FAILURE
  29  *
  30  * EAP-AKA / UMTS AUTS (re-synchronization):
  31  * AKA-AUTS <IMSI> <AUTS> <RAND>
  32  *
  33  * IMSI and max_chal are sent as an ASCII string,
  34  * Kc/SRES/RAND/AUTN/IK/CK/RES/AUTS as hex strings.
  35  *
  36  * An example implementation here reads GSM authentication triplets from a
  37  * text file in IMSI:Kc:SRES:RAND format, IMSI in ASCII, other fields as hex
  38  * strings. This is used to simulate an HLR/AuC. As such, it is not very useful
  39  * for real life authentication, but it is useful both as an example
  40  * implementation and for EAP-SIM/AKA/AKA' testing.
  41  *
  42  * For a stronger example design, Milenage and GSM-Milenage algorithms can be
  43  * used to dynamically generate authenticatipn information for EAP-AKA/AKA' and
  44  * EAP-SIM, respectively, if Ki is known.
  45  *
  46  * SQN generation follows the not time-based Profile 2 described in
  47  * 3GPP TS 33.102 Annex C.3.2. The length of IND is 5 bits by default, but this
  48  * can be changed with a command line options if needed.
  49  */
  50
  51 #include "includes.h"
  52 #include <sys/un.h>
  53 #ifdef CONFIG_SQLITE
  54 #include <sqlite3.h>
  55 #endif /* CONFIG_SQLITE */
  56
  57 #include "common.h"
  58 #include "crypto/milenage.h"
  59 #include "crypto/random.h"
  60
  61 static const char *default_socket_path = "/tmp/hlr_auc_gw.sock";
  62 static const char *socket_path;
  63 static int serv_sock = -1;
  64 static char *milenage_file = NULL;
  65 static int update_milenage = 0;
  66 static int sqn_changes = 0;
  67 static int ind_len = 5;
  68 static int stdout_debug = 1;
  69
  70 /* GSM triplets */
  71 struct gsm_triplet {
  72         struct gsm_triplet *next;
  73         char imsi[20];
  74         u8 kc[8];
  75         u8 sres[4];
  76         u8 _rand[16];
  77 };
  78
  79 static struct gsm_triplet *gsm_db = NULL, *gsm_db_pos = NULL;
  80
  81 /* OPc and AMF parameters for Milenage (Example algorithms for AKA). */
  82 struct milenage_parameters {
  83         struct milenage_parameters *next;
  84         char imsi[20];
  85         u8 ki[16];
  86         u8 opc[16];
  87         u8 amf[2];
  88         u8 sqn[6];
  89         int set;
  90         size_t res_len;
  91 };
  92
  93 static struct milenage_parameters *milenage_db = NULL;
  94
  95 #define EAP_SIM_MAX_CHAL 3
  96
  97 #define EAP_AKA_RAND_LEN 16
  98 #define EAP_AKA_AUTN_LEN 16
  99 #define EAP_AKA_AUTS_LEN 14
 100 #define EAP_AKA_RES_MIN_LEN 4
 101 #define EAP_AKA_RES_MAX_LEN 16
 102 #define EAP_AKA_IK_LEN 16
 103 #define EAP_AKA_CK_LEN 16
 104
 105
 106 #ifdef CONFIG_SQLITE
 107
 108 static sqlite3 *sqlite_db = NULL;
 109 static struct milenage_parameters db_tmp_milenage;
 110
 111
 112 static int db_table_exists(sqlite3 *db, const char *name)
 113 {
 114         char cmd[128];
 115         os_snprintf(cmd, sizeof(cmd), "SELECT 1 FROM %s;", name);
 116         return sqlite3_exec(db, cmd, NULL, NULL, NULL) == SQLITE_OK;
 117 }
 118
 119
 120 static int db_table_create_milenage(sqlite3 *db)
 121 {
 122         char *err = NULL;
 123         const char *sql =
 124                 "CREATE TABLE milenage("
 125                 "  imsi INTEGER PRIMARY KEY NOT NULL,"
 126                 "  ki CHAR(32) NOT NULL,"
 127                 "  opc CHAR(32) NOT NULL,"
 128                 "  amf CHAR(4) NOT NULL,"
 129                 "  sqn CHAR(12) NOT NULL,"
 130                 "  res_len INTEGER"
 131                 ");";
 132
 133         printf("Adding database table for milenage information\n");
 134         if (sqlite3_exec(db, sql, NULL, NULL, &err) != SQLITE_OK) {
 135                 printf("SQLite error: %s\n", err);
 136                 sqlite3_free(err);
 137                 return -1;
 138         }
 139
 140         return 0;
 141 }
 142
 143
 144 static sqlite3 * db_open(const char *db_file)
 145 {
 146         sqlite3 *db;
 147
 148         if (sqlite3_open(db_file, &db)) {
 149                 printf("Failed to open database %s: %s\n",
 150                        db_file, sqlite3_errmsg(db));
 151                 sqlite3_close(db);
 152                 return NULL;
 153         }
 154
 155         if (!db_table_exists(db, "milenage") &&
 156             db_table_create_milenage(db) < 0) {
 157                 sqlite3_close(db);
 158                 return NULL;
 159         }
 160
 161         return db;
 162 }
 163
 164
 165 static int get_milenage_cb(void *ctx, int argc, char *argv[], char *col[])
 166 {
 167         struct milenage_parameters *m = ctx;
 168         int i;
 169
 170         m->set = 1;
 171
 172         for (i = 0; i < argc; i++) {
 173                 if (os_strcmp(col[i], "ki") == 0 && argv[i] &&
 174                     hexstr2bin(argv[i], m->ki, sizeof(m->ki))) {
 175                         printf("Invalid ki value in database\n");
 176                         return -1;
 177                 }
 178
 179                 if (os_strcmp(col[i], "opc") == 0 && argv[i] &&
 180                     hexstr2bin(argv[i], m->opc, sizeof(m->opc))) {
 181                         printf("Invalid opcvalue in database\n");
 182                         return -1;
 183                 }
 184
 185                 if (os_strcmp(col[i], "amf") == 0 && argv[i] &&
 186                     hexstr2bin(argv[i], m->amf, sizeof(m->amf))) {
 187                         printf("Invalid amf value in database\n");
 188                         return -1;
 189                 }
 190
 191                 if (os_strcmp(col[i], "sqn") == 0 && argv[i] &&
 192                     hexstr2bin(argv[i], m->sqn, sizeof(m->sqn))) {
 193                         printf("Invalid sqn value in database\n");
 194                         return -1;
 195                 }
 196
 197                 if (os_strcmp(col[i], "res_len") == 0 && argv[i]) {
 198                         m->res_len = atoi(argv[i]);
 199                 }
 200         }
 201
 202         return 0;
 203 }
 204
 205
 206 static struct milenage_parameters * db_get_milenage(const char *imsi_txt)
 207 {
 208         char cmd[128];
 209         unsigned long long imsi;
 210
 211         os_memset(&db_tmp_milenage, 0, sizeof(db_tmp_milenage));
 212         imsi = atoll(imsi_txt);
 213         os_snprintf(db_tmp_milenage.imsi, sizeof(db_tmp_milenage.imsi),
 214                     "%llu", imsi);
 215         os_snprintf(cmd, sizeof(cmd),
 216                     "SELECT * FROM milenage WHERE imsi=%llu;", imsi);
 217         if (sqlite3_exec(sqlite_db, cmd, get_milenage_cb, &db_tmp_milenage,
 218                          NULL) != SQLITE_OK)
 219                 return NULL;
 220
 221         if (!db_tmp_milenage.set)
 222                 return NULL;
 223         return &db_tmp_milenage;
 224 }
 225
 226
 227 static int db_update_milenage_sqn(struct milenage_parameters *m)
 228 {
 229         char cmd[128], val[13], *pos;
 230
 231         if (sqlite_db == NULL)
 232                 return 0;
 233
 234         pos = val;
 235         pos += wpa_snprintf_hex(pos, sizeof(val), m->sqn, 6);
 236         *pos = '\0';
 237         os_snprintf(cmd, sizeof(cmd),
 238                     "UPDATE milenage SET sqn='%s' WHERE imsi=%s;",
 239                     val, m->imsi);
 240         if (sqlite3_exec(sqlite_db, cmd, NULL, NULL, NULL) != SQLITE_OK) {
 241                 printf("Failed to update SQN in database for IMSI %s\n",
 242                        m->imsi);
 243                 return -1;
 244         }
 245         return 0;
 246 }
 247
 248 #endif /* CONFIG_SQLITE */
 249
 250
 251 static int open_socket(const char *path)
 252 {
 253         struct sockaddr_un addr;
 254         int s;
 255
 256         s = socket(PF_UNIX, SOCK_DGRAM, 0);
 257         if (s < 0) {
 258                 perror("socket(PF_UNIX)");
 259                 return -1;
 260         }
 261
 262         memset(&addr, 0, sizeof(addr));
 263         addr.sun_family = AF_UNIX;
 264         os_strlcpy(addr.sun_path, path, sizeof(addr.sun_path));
 265         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 266                 perror("hlr-auc-gw: bind(PF_UNIX)");
 267                 close(s);
 268                 return -1;
 269         }
 270
 271         return s;
 272 }
 273
 274
 275 static int read_gsm_triplets(const char *fname)
 276 {
 277         FILE *f;
 278         char buf[200], *pos, *pos2;
 279         struct gsm_triplet *g = NULL;
 280         int line, ret = 0;
 281
 282         if (fname == NULL)
 283                 return -1;
 284
 285         f = fopen(fname, "r");
 286         if (f == NULL) {
 287                 printf("Could not open GSM tripler data file '%s'\n", fname);
 288                 return -1;
 289         }
 290
 291         line = 0;
 292         while (fgets(buf, sizeof(buf), f)) {
 293                 line++;
 294
 295                 /* Parse IMSI:Kc:SRES:RAND */
 296                 buf[sizeof(buf) - 1] = '\0';
 297                 if (buf[0] == '#')
 298                         continue;
 299                 pos = buf;
 300                 while (*pos != '\0' && *pos != '\n')
 301                         pos++;
 302                 if (*pos == '\n')
 303                         *pos = '\0';
 304                 pos = buf;
 305                 if (*pos == '\0')
 306                         continue;
 307
 308                 g = os_zalloc(sizeof(*g));
 309                 if (g == NULL) {
 310                         ret = -1;
 311                         break;
 312                 }
 313
 314                 /* IMSI */
 315                 pos2 = strchr(pos, ':');
 316                 if (pos2 == NULL) {
 317                         printf("%s:%d - Invalid IMSI (%s)\n",
 318                                fname, line, pos);
 319                         ret = -1;
 320                         break;
 321                 }
 322                 *pos2 = '\0';
 323                 if (strlen(pos) >= sizeof(g->imsi)) {
 324                         printf("%s:%d - Too long IMSI (%s)\n",
 325                                fname, line, pos);
 326                         ret = -1;
 327                         break;
 328                 }
 329                 os_strlcpy(g->imsi, pos, sizeof(g->imsi));
 330                 pos = pos2 + 1;
 331
 332                 /* Kc */
 333                 pos2 = strchr(pos, ':');
 334                 if (pos2 == NULL) {
 335                         printf("%s:%d - Invalid Kc (%s)\n", fname, line, pos);
 336                         ret = -1;
 337                         break;
 338                 }
 339                 *pos2 = '\0';
 340                 if (strlen(pos) != 16 || hexstr2bin(pos, g->kc, 8)) {
 341                         printf("%s:%d - Invalid Kc (%s)\n", fname, line, pos);
 342                         ret = -1;
 343                         break;
 344                 }
 345                 pos = pos2 + 1;
 346
 347                 /* SRES */
 348                 pos2 = strchr(pos, ':');
 349                 if (pos2 == NULL) {
 350                         printf("%s:%d - Invalid SRES (%s)\n", fname, line,
 351                                pos);
 352                         ret = -1;
 353                         break;
 354                 }
 355                 *pos2 = '\0';
 356                 if (strlen(pos) != 8 || hexstr2bin(pos, g->sres, 4)) {
 357                         printf("%s:%d - Invalid SRES (%s)\n", fname, line,
 358                                pos);
 359                         ret = -1;
 360                         break;
 361                 }
 362                 pos = pos2 + 1;
 363
 364                 /* RAND */
 365                 pos2 = strchr(pos, ':');
 366                 if (pos2)
 367                         *pos2 = '\0';
 368                 if (strlen(pos) != 32 || hexstr2bin(pos, g->_rand, 16)) {
 369                         printf("%s:%d - Invalid RAND (%s)\n", fname, line,
 370                                pos);
 371                         ret = -1;
 372                         break;
 373                 }
 374
 375                 g->next = gsm_db;
 376                 gsm_db = g;
 377                 g = NULL;
 378         }
 379         os_free(g);
 380
 381         fclose(f);
 382
 383         return ret;
 384 }
 385
 386
 387 static struct gsm_triplet * get_gsm_triplet(const char *imsi)
 388 {
 389         struct gsm_triplet *g = gsm_db_pos;
 390
 391         while (g) {
 392                 if (strcmp(g->imsi, imsi) == 0) {
 393                         gsm_db_pos = g->next;
 394                         return g;
 395                 }
 396                 g = g->next;
 397         }
 398
 399         g = gsm_db;
 400         while (g && g != gsm_db_pos) {
 401                 if (strcmp(g->imsi, imsi) == 0) {
 402                         gsm_db_pos = g->next;
 403                         return g;
 404                 }
 405                 g = g->next;
 406         }
 407
 408         return NULL;
 409 }
 410
 411
 412 static int read_milenage(const char *fname)
 413 {
 414         FILE *f;
 415         char buf[200], *pos, *pos2;
 416         struct milenage_parameters *m = NULL;
 417         int line, ret = 0;
 418
 419         if (fname == NULL)
 420                 return -1;
 421
 422         f = fopen(fname, "r");
 423         if (f == NULL) {
 424                 printf("Could not open Milenage data file '%s'\n", fname);
 425                 return -1;
 426         }
 427
 428         line = 0;
 429         while (fgets(buf, sizeof(buf), f)) {
 430                 line++;
 431
 432                 /* Parse IMSI Ki OPc AMF SQN [RES_len] */
 433                 buf[sizeof(buf) - 1] = '\0';
 434                 if (buf[0] == '#')
 435                         continue;
 436                 pos = buf;
 437                 while (*pos != '\0' && *pos != '\n')
 438                         pos++;
 439                 if (*pos == '\n')
 440                         *pos = '\0';
 441                 pos = buf;
 442                 if (*pos == '\0')
 443                         continue;
 444
 445                 m = os_zalloc(sizeof(*m));
 446                 if (m == NULL) {
 447                         ret = -1;
 448                         break;
 449                 }
 450
 451                 /* IMSI */
 452                 pos2 = strchr(pos, ' ');
 453                 if (pos2 == NULL) {
 454                         printf("%s:%d - Invalid IMSI (%s)\n",
 455                                fname, line, pos);
 456                         ret = -1;
 457                         break;
 458                 }
 459                 *pos2 = '\0';
 460                 if (strlen(pos) >= sizeof(m->imsi)) {
 461                         printf("%s:%d - Too long IMSI (%s)\n",
 462                                fname, line, pos);
 463                         ret = -1;
 464                         break;
 465                 }
 466                 os_strlcpy(m->imsi, pos, sizeof(m->imsi));
 467                 pos = pos2 + 1;
 468
 469                 /* Ki */
 470                 pos2 = strchr(pos, ' ');
 471                 if (pos2 == NULL) {
 472                         printf("%s:%d - Invalid Ki (%s)\n", fname, line, pos);
 473                         ret = -1;
 474                         break;
 475                 }
 476                 *pos2 = '\0';
 477                 if (strlen(pos) != 32 || hexstr2bin(pos, m->ki, 16)) {
 478                         printf("%s:%d - Invalid Ki (%s)\n", fname, line, pos);
 479                         ret = -1;
 480                         break;
 481                 }
 482                 pos = pos2 + 1;
 483
 484                 /* OPc */
 485                 pos2 = strchr(pos, ' ');
 486                 if (pos2 == NULL) {
 487                         printf("%s:%d - Invalid OPc (%s)\n", fname, line, pos);
 488                         ret = -1;
 489                         break;
 490                 }
 491                 *pos2 = '\0';
 492                 if (strlen(pos) != 32 || hexstr2bin(pos, m->opc, 16)) {
 493                         printf("%s:%d - Invalid OPc (%s)\n", fname, line, pos);
 494                         ret = -1;
 495                         break;
 496                 }
 497                 pos = pos2 + 1;
 498
 499                 /* AMF */
 500                 pos2 = strchr(pos, ' ');
 501                 if (pos2 == NULL) {
 502                         printf("%s:%d - Invalid AMF (%s)\n", fname, line, pos);
 503                         ret = -1;
 504                         break;
 505                 }
 506                 *pos2 = '\0';
 507                 if (strlen(pos) != 4 || hexstr2bin(pos, m->amf, 2)) {
 508                         printf("%s:%d - Invalid AMF (%s)\n", fname, line, pos);
 509                         ret = -1;
 510                         break;
 511                 }
 512                 pos = pos2 + 1;
 513
 514                 /* SQN */
 515                 pos2 = strchr(pos, ' ');
 516                 if (pos2)
 517                         *pos2 = '\0';
 518                 if (strlen(pos) != 12 || hexstr2bin(pos, m->sqn, 6)) {
 519                         printf("%s:%d - Invalid SEQ (%s)\n", fname, line, pos);
 520                         ret = -1;
 521                         break;
 522                 }
 523
 524                 if (pos2) {
 525                         pos = pos2 + 1;
 526                         m->res_len = atoi(pos);
 527                         if (m->res_len &&
 528                             (m->res_len < EAP_AKA_RES_MIN_LEN ||
 529                              m->res_len > EAP_AKA_RES_MAX_LEN)) {
 530                                 printf("%s:%d - Invalid RES_len (%s)\n",
 531                                        fname, line, pos);
 532                                 ret = -1;
 533                                 break;
 534                         }
 535                 }
 536
 537                 m->next = milenage_db;
 538                 milenage_db = m;
 539                 m = NULL;
 540         }
 541         os_free(m);
 542
 543         fclose(f);
 544
 545         return ret;
 546 }
 547
 548
 549 static void update_milenage_file(const char *fname)
 550 {
 551         FILE *f, *f2;
 552         char name[500], buf[500], *pos;
 553         char *end = buf + sizeof(buf);
 554         struct milenage_parameters *m;
 555         size_t imsi_len;
 556
 557         f = fopen(fname, "r");
 558         if (f == NULL) {
 559                 printf("Could not open Milenage data file '%s'\n", fname);
 560                 return;
 561         }
 562
 563         snprintf(name, sizeof(name), "%s.new", fname);
 564         f2 = fopen(name, "w");
 565         if (f2 == NULL) {
 566                 printf("Could not write Milenage data file '%s'\n", name);
 567                 fclose(f);
 568                 return;
 569         }
 570
 571         while (fgets(buf, sizeof(buf), f)) {
 572                 /* IMSI Ki OPc AMF SQN */
 573                 buf[sizeof(buf) - 1] = '\0';
 574
 575                 pos = strchr(buf, ' ');
 576                 if (buf[0] == '#' || pos == NULL || pos - buf >= 20)
 577                         goto no_update;
 578
 579                 imsi_len = pos - buf;
 580
 581                 for (m = milenage_db; m; m = m->next) {
 582                         if (strncmp(buf, m->imsi, imsi_len) == 0 &&
 583                             m->imsi[imsi_len] == '\0')
 584                                 break;
 585                 }
 586
 587                 if (!m)
 588                         goto no_update;
 589
 590                 pos = buf;
 591                 pos += snprintf(pos, end - pos, "%s ", m->imsi);
 592                 pos += wpa_snprintf_hex(pos, end - pos, m->ki, 16);
 593                 *pos++ = ' ';
 594                 pos += wpa_snprintf_hex(pos, end - pos, m->opc, 16);
 595                 *pos++ = ' ';
 596                 pos += wpa_snprintf_hex(pos, end - pos, m->amf, 2);
 597                 *pos++ = ' ';
 598                 pos += wpa_snprintf_hex(pos, end - pos, m->sqn, 6);
 599                 *pos++ = '\n';
 600
 601         no_update:
 602                 fprintf(f2, "%s", buf);
 603         }
 604
 605         fclose(f2);
 606         fclose(f);
 607
 608         snprintf(name, sizeof(name), "%s.bak", fname);
 609         if (rename(fname, name) < 0) {
 610                 perror("rename");
 611                 return;
 612         }
 613
 614         snprintf(name, sizeof(name), "%s.new", fname);
 615         if (rename(name, fname) < 0) {
 616                 perror("rename");
 617                 return;
 618         }
 619
 620 }
 621
 622
 623 static struct milenage_parameters * get_milenage(const char *imsi)
 624 {
 625         struct milenage_parameters *m = milenage_db;
 626
 627         while (m) {
 628                 if (strcmp(m->imsi, imsi) == 0)
 629                         break;
 630                 m = m->next;
 631         }
 632
 633 #ifdef CONFIG_SQLITE
 634         if (!m)
 635                 m = db_get_milenage(imsi);
 636 #endif /* CONFIG_SQLITE */
 637
 638         return m;
 639 }
 640
 641
 642 static int sim_req_auth(char *imsi, char *resp, size_t resp_len)
 643 {
 644         int count, max_chal, ret;
 645         char *pos;
 646         char *rpos, *rend;
 647         struct milenage_parameters *m;
 648         struct gsm_triplet *g;
 649
 650         resp[0] = '\0';
 651
 652         pos = strchr(imsi, ' ');
 653         if (pos) {
 654                 *pos++ = '\0';
 655                 max_chal = atoi(pos);
 656                 if (max_chal < 1 || max_chal > EAP_SIM_MAX_CHAL)
 657                         max_chal = EAP_SIM_MAX_CHAL;
 658         } else
 659                 max_chal = EAP_SIM_MAX_CHAL;
 660
 661         rend = resp + resp_len;
 662         rpos = resp;
 663         ret = snprintf(rpos, rend - rpos, "SIM-RESP-AUTH %s", imsi);
 664         if (ret < 0 || ret >= rend - rpos)
 665                 return -1;
 666         rpos += ret;
 667
 668         m = get_milenage(imsi);
 669         if (m) {
 670                 u8 _rand[16], sres[4], kc[8];
 671                 for (count = 0; count < max_chal; count++) {
 672                         if (random_get_bytes(_rand, 16) < 0)
 673                                 return -1;
 674                         gsm_milenage(m->opc, m->ki, _rand, sres, kc);
 675                         *rpos++ = ' ';
 676                         rpos += wpa_snprintf_hex(rpos, rend - rpos, kc, 8);
 677                         *rpos++ = ':';
 678                         rpos += wpa_snprintf_hex(rpos, rend - rpos, sres, 4);
 679                         *rpos++ = ':';
 680                         rpos += wpa_snprintf_hex(rpos, rend - rpos, _rand, 16);
 681                 }
 682                 *rpos = '\0';
 683                 return 0;
 684         }
 685
 686         count = 0;
 687         while (count < max_chal && (g = get_gsm_triplet(imsi))) {
 688                 if (strcmp(g->imsi, imsi) != 0)
 689                         continue;
 690
 691                 if (rpos < rend)
 692                         *rpos++ = ' ';
 693                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->kc, 8);
 694                 if (rpos < rend)
 695                         *rpos++ = ':';
 696                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->sres, 4);
 697                 if (rpos < rend)
 698                         *rpos++ = ':';
 699                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->_rand, 16);
 700                 count++;
 701         }
 702
 703         if (count == 0) {
 704                 printf("No GSM triplets found for %s\n", imsi);
 705                 ret = snprintf(rpos, rend - rpos, " FAILURE");
 706                 if (ret < 0 || ret >= rend - rpos)
 707                         return -1;
 708                 rpos += ret;
 709         }
 710
 711         return 0;
 712 }
 713
 714
 715 static int gsm_auth_req(char *imsi, char *resp, size_t resp_len)
 716 {
 717         int count, ret;
 718         char *pos, *rpos, *rend;
 719         struct milenage_parameters *m;
 720
 721         resp[0] = '\0';
 722
 723         pos = os_strchr(imsi, ' ');
 724         if (!pos)
 725                 return -1;
 726         *pos++ = '\0';
 727
 728         rend = resp + resp_len;
 729         rpos = resp;
 730         ret = os_snprintf(rpos, rend - rpos, "GSM-AUTH-RESP %s", imsi);
 731         if (os_snprintf_error(rend - rpos, ret))
 732                 return -1;
 733         rpos += ret;
 734
 735         m = get_milenage(imsi);
 736         if (m) {
 737                 u8 _rand[16], sres[4], kc[8];
 738                 for (count = 0; count < EAP_SIM_MAX_CHAL; count++) {
 739                         if (hexstr2bin(pos, _rand, 16) != 0)
 740                                 return -1;
 741                         gsm_milenage(m->opc, m->ki, _rand, sres, kc);
 742                         *rpos++ = count == 0 ? ' ' : ':';
 743                         rpos += wpa_snprintf_hex(rpos, rend - rpos, kc, 8);
 744                         *rpos++ = ':';
 745                         rpos += wpa_snprintf_hex(rpos, rend - rpos, sres, 4);
 746                         pos += 16 * 2;
 747                         if (*pos != ':')
 748                                 break;
 749                         pos++;
 750                 }
 751                 *rpos = '\0';
 752                 return 0;
 753         }
 754
 755         printf("No GSM triplets found for %s\n", imsi);
 756         ret = os_snprintf(rpos, rend - rpos, " FAILURE");
 757         if (os_snprintf_error(rend - rpos, ret))
 758                 return -1;
 759         rpos += ret;
 760
 761         return 0;
 762 }
 763
 764
 765 static void inc_sqn(u8 *sqn)
 766 {
 767         u64 val, seq, ind;
 768
 769         /*
 770          * SQN = SEQ | IND = SEQ1 | SEQ2 | IND
 771          *
 772          * The mechanism used here is not time-based, so SEQ2 is void and
 773          * SQN = SEQ1 | IND. The length of IND is ind_len bits and the length
 774          * of SEQ1 is 48 - ind_len bits.
 775          */
 776
 777         /* Increment both SEQ and IND by one */
 778         val = ((u64) WPA_GET_BE32(sqn) << 16) | ((u64) WPA_GET_BE16(sqn + 4));
 779         seq = (val >> ind_len) + 1;
 780         ind = (val + 1) & ((1 << ind_len) - 1);
 781         val = (seq << ind_len) | ind;
 782         WPA_PUT_BE32(sqn, val >> 16);
 783         WPA_PUT_BE16(sqn + 4, val & 0xffff);
 784 }
 785
 786
 787 static int aka_req_auth(char *imsi, char *resp, size_t resp_len)
 788 {
 789         /* AKA-RESP-AUTH <IMSI> <RAND> <AUTN> <IK> <CK> <RES> */
 790         char *pos, *end;
 791         u8 _rand[EAP_AKA_RAND_LEN];
 792         u8 autn[EAP_AKA_AUTN_LEN];
 793         u8 ik[EAP_AKA_IK_LEN];
 794         u8 ck[EAP_AKA_CK_LEN];
 795         u8 res[EAP_AKA_RES_MAX_LEN];
 796         size_t res_len;
 797         int ret;
 798         struct milenage_parameters *m;
 799         int failed = 0;
 800
 801         m = get_milenage(imsi);
 802         if (m) {
 803                 if (random_get_bytes(_rand, EAP_AKA_RAND_LEN) < 0)
 804                         return -1;
 805                 res_len = EAP_AKA_RES_MAX_LEN;
 806                 inc_sqn(m->sqn);
 807 #ifdef CONFIG_SQLITE
 808                 db_update_milenage_sqn(m);
 809 #endif /* CONFIG_SQLITE */
 810                 sqn_changes = 1;
 811                 if (stdout_debug) {
 812                         printf("AKA: Milenage with SQN=%02x%02x%02x%02x%02x%02x\n",
 813                                m->sqn[0], m->sqn[1], m->sqn[2],
 814                                m->sqn[3], m->sqn[4], m->sqn[5]);
 815                 }
 816                 milenage_generate(m->opc, m->amf, m->ki, m->sqn, _rand,
 817                                   autn, ik, ck, res, &res_len);
 818                 if (m->res_len >= EAP_AKA_RES_MIN_LEN &&
 819                     m->res_len <= EAP_AKA_RES_MAX_LEN &&
 820                     m->res_len < res_len)
 821                         res_len = m->res_len;
 822         } else {
 823                 printf("Unknown IMSI: %s\n", imsi);
 824 #ifdef AKA_USE_FIXED_TEST_VALUES
 825                 printf("Using fixed test values for AKA\n");
 826                 memset(_rand, '0', EAP_AKA_RAND_LEN);
 827                 memset(autn, '1', EAP_AKA_AUTN_LEN);
 828                 memset(ik, '3', EAP_AKA_IK_LEN);
 829                 memset(ck, '4', EAP_AKA_CK_LEN);
 830                 memset(res, '2', EAP_AKA_RES_MAX_LEN);
 831                 res_len = EAP_AKA_RES_MAX_LEN;
 832 #else /* AKA_USE_FIXED_TEST_VALUES */
 833                 failed = 1;
 834 #endif /* AKA_USE_FIXED_TEST_VALUES */
 835         }
 836
 837         pos = resp;
 838         end = resp + resp_len;
 839         ret = snprintf(pos, end - pos, "AKA-RESP-AUTH %s ", imsi);
 840         if (ret < 0 || ret >= end - pos)
 841                 return -1;
 842         pos += ret;
 843         if (failed) {
 844                 ret = snprintf(pos, end - pos, "FAILURE");
 845                 if (ret < 0 || ret >= end - pos)
 846                         return -1;
 847                 pos += ret;
 848                 return 0;
 849         }
 850         pos += wpa_snprintf_hex(pos, end - pos, _rand, EAP_AKA_RAND_LEN);
 851         *pos++ = ' ';
 852         pos += wpa_snprintf_hex(pos, end - pos, autn, EAP_AKA_AUTN_LEN);
 853         *pos++ = ' ';
 854         pos += wpa_snprintf_hex(pos, end - pos, ik, EAP_AKA_IK_LEN);
 855         *pos++ = ' ';
 856         pos += wpa_snprintf_hex(pos, end - pos, ck, EAP_AKA_CK_LEN);
 857         *pos++ = ' ';
 858         pos += wpa_snprintf_hex(pos, end - pos, res, res_len);
 859
 860         return 0;
 861 }
 862
 863
 864 static int aka_auts(char *imsi, char *resp, size_t resp_len)
 865 {
 866         char *auts, *__rand;
 867         u8 _auts[EAP_AKA_AUTS_LEN], _rand[EAP_AKA_RAND_LEN], sqn[6];
 868         struct milenage_parameters *m;
 869
 870         resp[0] = '\0';
 871
 872         /* AKA-AUTS <IMSI> <AUTS> <RAND> */
 873
 874         auts = strchr(imsi, ' ');
 875         if (auts == NULL)
 876                 return -1;
 877         *auts++ = '\0';
 878
 879         __rand = strchr(auts, ' ');
 880         if (__rand == NULL)
 881                 return -1;
 882         *__rand++ = '\0';
 883
 884         if (stdout_debug) {
 885                 printf("AKA-AUTS: IMSI=%s AUTS=%s RAND=%s\n",
 886                        imsi, auts, __rand);
 887         }
 888         if (hexstr2bin(auts, _auts, EAP_AKA_AUTS_LEN) ||
 889             hexstr2bin(__rand, _rand, EAP_AKA_RAND_LEN)) {
 890                 printf("Could not parse AUTS/RAND\n");
 891                 return -1;
 892         }
 893
 894         m = get_milenage(imsi);
 895         if (m == NULL) {
 896                 printf("Unknown IMSI: %s\n", imsi);
 897                 return -1;
 898         }
 899
 900         if (milenage_auts(m->opc, m->ki, _rand, _auts, sqn)) {
 901                 printf("AKA-AUTS: Incorrect MAC-S\n");
 902         } else {
 903                 memcpy(m->sqn, sqn, 6);
 904                 if (stdout_debug) {
 905                         printf("AKA-AUTS: Re-synchronized: "
 906                                "SQN=%02x%02x%02x%02x%02x%02x\n",
 907                                sqn[0], sqn[1], sqn[2], sqn[3], sqn[4], sqn[5]);
 908                 }
 909 #ifdef CONFIG_SQLITE
 910                 db_update_milenage_sqn(m);
 911 #endif /* CONFIG_SQLITE */
 912                 sqn_changes = 1;
 913         }
 914
 915         return 0;
 916 }
 917
 918
 919 static int process_cmd(char *cmd, char *resp, size_t resp_len)
 920 {
 921         if (os_strncmp(cmd, "SIM-REQ-AUTH ", 13) == 0)
 922                 return sim_req_auth(cmd + 13, resp, resp_len);
 923
 924         if (os_strncmp(cmd, "GSM-AUTH-REQ ", 13) == 0)
 925                 return gsm_auth_req(cmd + 13, resp, resp_len);
 926
 927         if (os_strncmp(cmd, "AKA-REQ-AUTH ", 13) == 0)
 928                 return aka_req_auth(cmd + 13, resp, resp_len);
 929
 930         if (os_strncmp(cmd, "AKA-AUTS ", 9) == 0)
 931                 return aka_auts(cmd + 9, resp, resp_len);
 932
 933         printf("Unknown request: %s\n", cmd);
 934         return -1;
 935 }
 936
 937
 938 static int process(int s)
 939 {
 940         char buf[1000], resp[1000];
 941         struct sockaddr_un from;
 942         socklen_t fromlen;
 943         ssize_t res;
 944
 945         fromlen = sizeof(from);
 946         res = recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *) &from,
 947                        &fromlen);
 948         if (res < 0) {
 949                 perror("recvfrom");
 950                 return -1;
 951         }
 952
 953         if (res == 0)
 954                 return 0;
 955
 956         if ((size_t) res >= sizeof(buf))
 957                 res = sizeof(buf) - 1;
 958         buf[res] = '\0';
 959
 960         printf("Received: %s\n", buf);
 961
 962         if (process_cmd(buf, resp, sizeof(resp)) < 0) {
 963                 printf("Failed to process request\n");
 964                 return -1;
 965         }
 966
 967         if (resp[0] == '\0') {
 968                 printf("No response\n");
 969                 return 0;
 970         }
 971
 972         printf("Send: %s\n", resp);
 973
 974         if (sendto(s, resp, os_strlen(resp), 0, (struct sockaddr *) &from,
 975                    fromlen) < 0)
 976                 perror("send");
 977
 978         return 0;
 979 }
 980
 981
 982 static void cleanup(void)
 983 {
 984         struct gsm_triplet *g, *gprev;
 985         struct milenage_parameters *m, *prev;
 986
 987         if (update_milenage && milenage_file && sqn_changes)
 988                 update_milenage_file(milenage_file);
 989
 990         g = gsm_db;
 991         while (g) {
 992                 gprev = g;
 993                 g = g->next;
 994                 os_free(gprev);
 995         }
 996
 997         m = milenage_db;
 998         while (m) {
 999                 prev = m;
1000                 m = m->next;
1001                 os_free(prev);
1002         }
1003
1004         if (serv_sock >= 0)
1005                 close(serv_sock);
1006         if (socket_path)
1007                 unlink(socket_path);
1008
1009 #ifdef CONFIG_SQLITE
1010         if (sqlite_db) {
1011                 sqlite3_close(sqlite_db);
1012                 sqlite_db = NULL;
1013         }
1014 #endif /* CONFIG_SQLITE */
1015 }
1016
1017
1018 static void handle_term(int sig)
1019 {
1020         printf("Signal %d - terminate\n", sig);
1021         exit(0);
1022 }
1023
1024
1025 static void usage(void)
1026 {
1027         printf("HLR/AuC testing gateway for hostapd EAP-SIM/AKA "
1028                "database/authenticator\n"
1029                "Copyright (c) 2005-2007, 2012-2013, Jouni Malinen <j@w1.fi>\n"
1030                "\n"
1031                "usage:\n"
1032                "hlr_auc_gw [-hu] [-s<socket path>] [-g<triplet file>] "
1033                "[-m<milenage file>] \\\n"
1034                "        [-D<DB file>] [-i<IND len in bits>] [command]\n"
1035                "\n"
1036                "options:\n"
1037                "  -h = show this usage help\n"
1038                "  -u = update SQN in Milenage file on exit\n"
1039                "  -s<socket path> = path for UNIX domain socket\n"
1040                "                    (default: %s)\n"
1041                "  -g<triplet file> = path for GSM authentication triplets\n"
1042                "  -m<milenage file> = path for Milenage keys\n"
1043                "  -D<DB file> = path to SQLite database\n"
1044                "  -i<IND len in bits> = IND length for SQN (default: 5)\n"
1045                "\n"
1046                "If the optional command argument, like "
1047                "\"AKA-REQ-AUTH <IMSI>\" is used, a single\n"
1048                "command is processed with response sent to stdout. Otherwise, "
1049                "hlr_auc_gw opens\n"
1050                "a control interface and processes commands sent through it "
1051                "(e.g., by EAP server\n"
1052                "in hostapd).\n",
1053                default_socket_path);
1054 }
1055
1056
1057 int main(int argc, char *argv[])
1058 {
1059         int c;
1060         char *gsm_triplet_file = NULL;
1061         char *sqlite_db_file = NULL;
1062         int ret = 0;
1063
1064         if (os_program_init())
1065                 return -1;
1066
1067         socket_path = default_socket_path;
1068
1069         for (;;) {
1070                 c = getopt(argc, argv, "D:g:hi:m:s:u");
1071                 if (c < 0)
1072                         break;
1073                 switch (c) {
1074                 case 'D':
1075 #ifdef CONFIG_SQLITE
1076                         sqlite_db_file = optarg;
1077                         break;
1078 #else /* CONFIG_SQLITE */
1079                         printf("No SQLite support included in the build\n");
1080                         return -1;
1081 #endif /* CONFIG_SQLITE */
1082                 case 'g':
1083                         gsm_triplet_file = optarg;
1084                         break;
1085                 case 'h':
1086                         usage();
1087                         return 0;
1088                 case 'i':
1089                         ind_len = atoi(optarg);
1090                         if (ind_len < 0 || ind_len > 32) {
1091                                 printf("Invalid IND length\n");
1092                                 return -1;
1093                         }
1094                         break;
1095                 case 'm':
1096                         milenage_file = optarg;
1097                         break;
1098                 case 's':
1099                         socket_path = optarg;
1100                         break;
1101                 case 'u':
1102                         update_milenage = 1;
1103                         break;
1104                 default:
1105                         usage();
1106                         return -1;
1107                 }
1108         }
1109
1110         if (!gsm_triplet_file && !milenage_file && !sqlite_db_file) {
1111                 usage();
1112                 return -1;
1113         }
1114
1115 #ifdef CONFIG_SQLITE
1116         if (sqlite_db_file && (sqlite_db = db_open(sqlite_db_file)) == NULL)
1117                 return -1;
1118 #endif /* CONFIG_SQLITE */
1119
1120         if (gsm_triplet_file && read_gsm_triplets(gsm_triplet_file) < 0)
1121                 return -1;
1122
1123         if (milenage_file && read_milenage(milenage_file) < 0)
1124                 return -1;
1125
1126         if (optind == argc) {
1127                 serv_sock = open_socket(socket_path);
1128                 if (serv_sock < 0)
1129                         return -1;
1130
1131                 printf("Listening for requests on %s\n", socket_path);
1132
1133                 atexit(cleanup);
1134                 signal(SIGTERM, handle_term);
1135                 signal(SIGINT, handle_term);
1136
1137                 for (;;)
1138                         process(serv_sock);
1139         } else {
1140                 char buf[1000];
1141                 socket_path = NULL;
1142                 stdout_debug = 0;
1143                 if (process_cmd(argv[optind], buf, sizeof(buf)) < 0) {
1144                         printf("FAIL\n");
1145                         ret = -1;
1146                 } else {
1147                         printf("%s\n", buf);
1148                 }
1149                 cleanup();
1150         }
1151
1152 #ifdef CONFIG_SQLITE
1153         if (sqlite_db) {
1154                 sqlite3_close(sqlite_db);
1155                 sqlite_db = NULL;
1156         }
1157 #endif /* CONFIG_SQLITE */
1158
1159         os_program_deinit();
1160
1161         return ret;
1162 }