hostapd/hlr_auc_gw.c

   1 /*
   2  * HLR/AuC testing gateway for hostapd EAP-SIM/AKA database/authenticator
   3  * Copyright (c) 2005-2007, 2012-2017, 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 triplet 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 = NULL;
 316                 pos = str_token(buf, ":", &pos2);
 317                 if (!pos || os_strlen(pos) >= sizeof(g->imsi)) {
 318                         printf("%s:%d - Invalid IMSI\n", fname, line);
 319                         ret = -1;
 320                         break;
 321                 }
 322                 os_strlcpy(g->imsi, pos, sizeof(g->imsi));
 323
 324                 /* Kc */
 325                 pos = str_token(buf, ":", &pos2);
 326                 if (!pos || os_strlen(pos) != 16 || hexstr2bin(pos, g->kc, 8)) {
 327                         printf("%s:%d - Invalid Kc\n", fname, line);
 328                         ret = -1;
 329                         break;
 330                 }
 331
 332                 /* SRES */
 333                 pos = str_token(buf, ":", &pos2);
 334                 if (!pos || os_strlen(pos) != 8 ||
 335                     hexstr2bin(pos, g->sres, 4)) {
 336                         printf("%s:%d - Invalid SRES\n", fname, line);
 337                         ret = -1;
 338                         break;
 339                 }
 340
 341                 /* RAND */
 342                 pos = str_token(buf, ":", &pos2);
 343                 if (!pos || os_strlen(pos) != 32 ||
 344                     hexstr2bin(pos, g->_rand, 16)) {
 345                         printf("%s:%d - Invalid RAND\n", fname, line);
 346                         ret = -1;
 347                         break;
 348                 }
 349
 350                 g->next = gsm_db;
 351                 gsm_db = g;
 352                 g = NULL;
 353         }
 354         os_free(g);
 355
 356         fclose(f);
 357
 358         return ret;
 359 }
 360
 361
 362 static struct gsm_triplet * get_gsm_triplet(const char *imsi)
 363 {
 364         struct gsm_triplet *g = gsm_db_pos;
 365
 366         while (g) {
 367                 if (strcmp(g->imsi, imsi) == 0) {
 368                         gsm_db_pos = g->next;
 369                         return g;
 370                 }
 371                 g = g->next;
 372         }
 373
 374         g = gsm_db;
 375         while (g && g != gsm_db_pos) {
 376                 if (strcmp(g->imsi, imsi) == 0) {
 377                         gsm_db_pos = g->next;
 378                         return g;
 379                 }
 380                 g = g->next;
 381         }
 382
 383         return NULL;
 384 }
 385
 386
 387 static int read_milenage(const char *fname)
 388 {
 389         FILE *f;
 390         char buf[200], *pos, *pos2;
 391         struct milenage_parameters *m = NULL;
 392         int line, ret = 0;
 393
 394         if (fname == NULL)
 395                 return -1;
 396
 397         f = fopen(fname, "r");
 398         if (f == NULL) {
 399                 printf("Could not open Milenage data file '%s'\n", fname);
 400                 return -1;
 401         }
 402
 403         line = 0;
 404         while (fgets(buf, sizeof(buf), f)) {
 405                 line++;
 406
 407                 /* Parse IMSI Ki OPc AMF SQN [RES_len] */
 408                 buf[sizeof(buf) - 1] = '\0';
 409                 if (buf[0] == '#')
 410                         continue;
 411                 pos = buf;
 412                 while (*pos != '\0' && *pos != '\n')
 413                         pos++;
 414                 if (*pos == '\n')
 415                         *pos = '\0';
 416                 pos = buf;
 417                 if (*pos == '\0')
 418                         continue;
 419
 420                 m = os_zalloc(sizeof(*m));
 421                 if (m == NULL) {
 422                         ret = -1;
 423                         break;
 424                 }
 425
 426                 /* IMSI */
 427                 pos2 = NULL;
 428                 pos = str_token(buf, " ", &pos2);
 429                 if (!pos || os_strlen(pos) >= sizeof(m->imsi)) {
 430                         printf("%s:%d - Invalid IMSI\n", fname, line);
 431                         ret = -1;
 432                         break;
 433                 }
 434                 os_strlcpy(m->imsi, pos, sizeof(m->imsi));
 435
 436                 /* Ki */
 437                 pos = str_token(buf, " ", &pos2);
 438                 if (!pos || os_strlen(pos) != 32 ||
 439                     hexstr2bin(pos, m->ki, 16)) {
 440                         printf("%s:%d - Invalid Ki\n", fname, line);
 441                         ret = -1;
 442                         break;
 443                 }
 444
 445                 /* OPc */
 446                 pos = str_token(buf, " ", &pos2);
 447                 if (!pos || os_strlen(pos) != 32 ||
 448                     hexstr2bin(pos, m->opc, 16)) {
 449                         printf("%s:%d - Invalid OPc\n", fname, line);
 450                         ret = -1;
 451                         break;
 452                 }
 453
 454                 /* AMF */
 455                 pos = str_token(buf, " ", &pos2);
 456                 if (!pos || os_strlen(pos) != 4 || hexstr2bin(pos, m->amf, 2)) {
 457                         printf("%s:%d - Invalid AMF\n", fname, line);
 458                         ret = -1;
 459                         break;
 460                 }
 461
 462                 /* SQN */
 463                 pos = str_token(buf, " ", &pos2);
 464                 if (!pos || os_strlen(pos) != 12 ||
 465                     hexstr2bin(pos, m->sqn, 6)) {
 466                         printf("%s:%d - Invalid SEQ\n", fname, line);
 467                         ret = -1;
 468                         break;
 469                 }
 470
 471                 pos = str_token(buf, " ", &pos2);
 472                 if (pos) {
 473                         m->res_len = atoi(pos);
 474                         if (m->res_len &&
 475                             (m->res_len < EAP_AKA_RES_MIN_LEN ||
 476                              m->res_len > EAP_AKA_RES_MAX_LEN)) {
 477                                 printf("%s:%d - Invalid RES_len\n",
 478                                        fname, line);
 479                                 ret = -1;
 480                                 break;
 481                         }
 482                 }
 483
 484                 m->next = milenage_db;
 485                 milenage_db = m;
 486                 m = NULL;
 487         }
 488         os_free(m);
 489
 490         fclose(f);
 491
 492         return ret;
 493 }
 494
 495
 496 static void update_milenage_file(const char *fname)
 497 {
 498         FILE *f, *f2;
 499         char name[500], buf[500], *pos;
 500         char *end = buf + sizeof(buf);
 501         struct milenage_parameters *m;
 502         size_t imsi_len;
 503
 504         f = fopen(fname, "r");
 505         if (f == NULL) {
 506                 printf("Could not open Milenage data file '%s'\n", fname);
 507                 return;
 508         }
 509
 510         snprintf(name, sizeof(name), "%s.new", fname);
 511         f2 = fopen(name, "w");
 512         if (f2 == NULL) {
 513                 printf("Could not write Milenage data file '%s'\n", name);
 514                 fclose(f);
 515                 return;
 516         }
 517
 518         while (fgets(buf, sizeof(buf), f)) {
 519                 /* IMSI Ki OPc AMF SQN */
 520                 buf[sizeof(buf) - 1] = '\0';
 521
 522                 pos = strchr(buf, ' ');
 523                 if (buf[0] == '#' || pos == NULL || pos - buf >= 20)
 524                         goto no_update;
 525
 526                 imsi_len = pos - buf;
 527
 528                 for (m = milenage_db; m; m = m->next) {
 529                         if (strncmp(buf, m->imsi, imsi_len) == 0 &&
 530                             m->imsi[imsi_len] == '\0')
 531                                 break;
 532                 }
 533
 534                 if (!m)
 535                         goto no_update;
 536
 537                 pos = buf;
 538                 pos += snprintf(pos, end - pos, "%s ", m->imsi);
 539                 pos += wpa_snprintf_hex(pos, end - pos, m->ki, 16);
 540                 *pos++ = ' ';
 541                 pos += wpa_snprintf_hex(pos, end - pos, m->opc, 16);
 542                 *pos++ = ' ';
 543                 pos += wpa_snprintf_hex(pos, end - pos, m->amf, 2);
 544                 *pos++ = ' ';
 545                 pos += wpa_snprintf_hex(pos, end - pos, m->sqn, 6);
 546                 *pos++ = '\n';
 547
 548         no_update:
 549                 fprintf(f2, "%s", buf);
 550         }
 551
 552         fclose(f2);
 553         fclose(f);
 554
 555         snprintf(name, sizeof(name), "%s.bak", fname);
 556         if (rename(fname, name) < 0) {
 557                 perror("rename");
 558                 return;
 559         }
 560
 561         snprintf(name, sizeof(name), "%s.new", fname);
 562         if (rename(name, fname) < 0) {
 563                 perror("rename");
 564                 return;
 565         }
 566
 567 }
 568
 569
 570 static struct milenage_parameters * get_milenage(const char *imsi)
 571 {
 572         struct milenage_parameters *m = milenage_db;
 573
 574         while (m) {
 575                 if (strcmp(m->imsi, imsi) == 0)
 576                         break;
 577                 m = m->next;
 578         }
 579
 580 #ifdef CONFIG_SQLITE
 581         if (!m)
 582                 m = db_get_milenage(imsi);
 583 #endif /* CONFIG_SQLITE */
 584
 585         return m;
 586 }
 587
 588
 589 static int sim_req_auth(char *imsi, char *resp, size_t resp_len)
 590 {
 591         int count, max_chal, ret;
 592         char *pos;
 593         char *rpos, *rend;
 594         struct milenage_parameters *m;
 595         struct gsm_triplet *g;
 596
 597         resp[0] = '\0';
 598
 599         pos = strchr(imsi, ' ');
 600         if (pos) {
 601                 *pos++ = '\0';
 602                 max_chal = atoi(pos);
 603                 if (max_chal < 1 || max_chal > EAP_SIM_MAX_CHAL)
 604                         max_chal = EAP_SIM_MAX_CHAL;
 605         } else
 606                 max_chal = EAP_SIM_MAX_CHAL;
 607
 608         rend = resp + resp_len;
 609         rpos = resp;
 610         ret = snprintf(rpos, rend - rpos, "SIM-RESP-AUTH %s", imsi);
 611         if (ret < 0 || ret >= rend - rpos)
 612                 return -1;
 613         rpos += ret;
 614
 615         m = get_milenage(imsi);
 616         if (m) {
 617                 u8 _rand[16], sres[4], kc[8];
 618                 for (count = 0; count < max_chal; count++) {
 619                         if (random_get_bytes(_rand, 16) < 0)
 620                                 return -1;
 621                         gsm_milenage(m->opc, m->ki, _rand, sres, kc);
 622                         *rpos++ = ' ';
 623                         rpos += wpa_snprintf_hex(rpos, rend - rpos, kc, 8);
 624                         *rpos++ = ':';
 625                         rpos += wpa_snprintf_hex(rpos, rend - rpos, sres, 4);
 626                         *rpos++ = ':';
 627                         rpos += wpa_snprintf_hex(rpos, rend - rpos, _rand, 16);
 628                 }
 629                 *rpos = '\0';
 630                 return 0;
 631         }
 632
 633         count = 0;
 634         while (count < max_chal && (g = get_gsm_triplet(imsi))) {
 635                 if (strcmp(g->imsi, imsi) != 0)
 636                         continue;
 637
 638                 if (rpos < rend)
 639                         *rpos++ = ' ';
 640                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->kc, 8);
 641                 if (rpos < rend)
 642                         *rpos++ = ':';
 643                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->sres, 4);
 644                 if (rpos < rend)
 645                         *rpos++ = ':';
 646                 rpos += wpa_snprintf_hex(rpos, rend - rpos, g->_rand, 16);
 647                 count++;
 648         }
 649
 650         if (count == 0) {
 651                 printf("No GSM triplets found for %s\n", imsi);
 652                 ret = snprintf(rpos, rend - rpos, " FAILURE");
 653                 if (ret < 0 || ret >= rend - rpos)
 654                         return -1;
 655                 rpos += ret;
 656         }
 657
 658         return 0;
 659 }
 660
 661
 662 static int gsm_auth_req(char *imsi, char *resp, size_t resp_len)
 663 {
 664         int count, ret;
 665         char *pos, *rpos, *rend;
 666         struct milenage_parameters *m;
 667
 668         resp[0] = '\0';
 669
 670         pos = os_strchr(imsi, ' ');
 671         if (!pos)
 672                 return -1;
 673         *pos++ = '\0';
 674
 675         rend = resp + resp_len;
 676         rpos = resp;
 677         ret = os_snprintf(rpos, rend - rpos, "GSM-AUTH-RESP %s", imsi);
 678         if (os_snprintf_error(rend - rpos, ret))
 679                 return -1;
 680         rpos += ret;
 681
 682         m = get_milenage(imsi);
 683         if (m) {
 684                 u8 _rand[16], sres[4], kc[8];
 685                 for (count = 0; count < EAP_SIM_MAX_CHAL; count++) {
 686                         if (hexstr2bin(pos, _rand, 16) != 0)
 687                                 return -1;
 688                         gsm_milenage(m->opc, m->ki, _rand, sres, kc);
 689                         *rpos++ = count == 0 ? ' ' : ':';
 690                         rpos += wpa_snprintf_hex(rpos, rend - rpos, kc, 8);
 691                         *rpos++ = ':';
 692                         rpos += wpa_snprintf_hex(rpos, rend - rpos, sres, 4);
 693                         pos += 16 * 2;
 694                         if (*pos != ':')
 695                                 break;
 696                         pos++;
 697                 }
 698                 *rpos = '\0';
 699                 return 0;
 700         }
 701
 702         printf("No GSM triplets found for %s\n", imsi);
 703         ret = os_snprintf(rpos, rend - rpos, " FAILURE");
 704         if (os_snprintf_error(rend - rpos, ret))
 705                 return -1;
 706         rpos += ret;
 707
 708         return 0;
 709 }
 710
 711
 712 static void inc_sqn(u8 *sqn)
 713 {
 714         u64 val, seq, ind;
 715
 716         /*
 717          * SQN = SEQ | IND = SEQ1 | SEQ2 | IND
 718          *
 719          * The mechanism used here is not time-based, so SEQ2 is void and
 720          * SQN = SEQ1 | IND. The length of IND is ind_len bits and the length
 721          * of SEQ1 is 48 - ind_len bits.
 722          */
 723
 724         /* Increment both SEQ and IND by one */
 725         val = ((u64) WPA_GET_BE32(sqn) << 16) | ((u64) WPA_GET_BE16(sqn + 4));
 726         seq = (val >> ind_len) + 1;
 727         ind = (val + 1) & ((1 << ind_len) - 1);
 728         val = (seq << ind_len) | ind;
 729         WPA_PUT_BE32(sqn, val >> 16);
 730         WPA_PUT_BE16(sqn + 4, val & 0xffff);
 731 }
 732
 733
 734 static int aka_req_auth(char *imsi, char *resp, size_t resp_len)
 735 {
 736         /* AKA-RESP-AUTH <IMSI> <RAND> <AUTN> <IK> <CK> <RES> */
 737         char *pos, *end;
 738         u8 _rand[EAP_AKA_RAND_LEN];
 739         u8 autn[EAP_AKA_AUTN_LEN];
 740         u8 ik[EAP_AKA_IK_LEN];
 741         u8 ck[EAP_AKA_CK_LEN];
 742         u8 res[EAP_AKA_RES_MAX_LEN];
 743         size_t res_len;
 744         int ret;
 745         struct milenage_parameters *m;
 746         int failed = 0;
 747
 748         m = get_milenage(imsi);
 749         if (m) {
 750                 if (random_get_bytes(_rand, EAP_AKA_RAND_LEN) < 0)
 751                         return -1;
 752                 res_len = EAP_AKA_RES_MAX_LEN;
 753                 inc_sqn(m->sqn);
 754 #ifdef CONFIG_SQLITE
 755                 db_update_milenage_sqn(m);
 756 #endif /* CONFIG_SQLITE */
 757                 sqn_changes = 1;
 758                 if (stdout_debug) {
 759                         printf("AKA: Milenage with SQN=%02x%02x%02x%02x%02x%02x\n",
 760                                m->sqn[0], m->sqn[1], m->sqn[2],
 761                                m->sqn[3], m->sqn[4], m->sqn[5]);
 762                 }
 763                 milenage_generate(m->opc, m->amf, m->ki, m->sqn, _rand,
 764                                   autn, ik, ck, res, &res_len);
 765                 if (m->res_len >= EAP_AKA_RES_MIN_LEN &&
 766                     m->res_len <= EAP_AKA_RES_MAX_LEN &&
 767                     m->res_len < res_len)
 768                         res_len = m->res_len;
 769         } else {
 770                 printf("Unknown IMSI: %s\n", imsi);
 771 #ifdef AKA_USE_FIXED_TEST_VALUES
 772                 printf("Using fixed test values for AKA\n");
 773                 memset(_rand, '0', EAP_AKA_RAND_LEN);
 774                 memset(autn, '1', EAP_AKA_AUTN_LEN);
 775                 memset(ik, '3', EAP_AKA_IK_LEN);
 776                 memset(ck, '4', EAP_AKA_CK_LEN);
 777                 memset(res, '2', EAP_AKA_RES_MAX_LEN);
 778                 res_len = EAP_AKA_RES_MAX_LEN;
 779 #else /* AKA_USE_FIXED_TEST_VALUES */
 780                 failed = 1;
 781 #endif /* AKA_USE_FIXED_TEST_VALUES */
 782         }
 783
 784         pos = resp;
 785         end = resp + resp_len;
 786         ret = snprintf(pos, end - pos, "AKA-RESP-AUTH %s ", imsi);
 787         if (ret < 0 || ret >= end - pos)
 788                 return -1;
 789         pos += ret;
 790         if (failed) {
 791                 ret = snprintf(pos, end - pos, "FAILURE");
 792                 if (ret < 0 || ret >= end - pos)
 793                         return -1;
 794                 pos += ret;
 795                 return 0;
 796         }
 797         pos += wpa_snprintf_hex(pos, end - pos, _rand, EAP_AKA_RAND_LEN);
 798         *pos++ = ' ';
 799         pos += wpa_snprintf_hex(pos, end - pos, autn, EAP_AKA_AUTN_LEN);
 800         *pos++ = ' ';
 801         pos += wpa_snprintf_hex(pos, end - pos, ik, EAP_AKA_IK_LEN);
 802         *pos++ = ' ';
 803         pos += wpa_snprintf_hex(pos, end - pos, ck, EAP_AKA_CK_LEN);
 804         *pos++ = ' ';
 805         pos += wpa_snprintf_hex(pos, end - pos, res, res_len);
 806
 807         return 0;
 808 }
 809
 810
 811 static int aka_auts(char *imsi, char *resp, size_t resp_len)
 812 {
 813         char *auts, *__rand;
 814         u8 _auts[EAP_AKA_AUTS_LEN], _rand[EAP_AKA_RAND_LEN], sqn[6];
 815         struct milenage_parameters *m;
 816
 817         resp[0] = '\0';
 818
 819         /* AKA-AUTS <IMSI> <AUTS> <RAND> */
 820
 821         auts = strchr(imsi, ' ');
 822         if (auts == NULL)
 823                 return -1;
 824         *auts++ = '\0';
 825
 826         __rand = strchr(auts, ' ');
 827         if (__rand == NULL)
 828                 return -1;
 829         *__rand++ = '\0';
 830
 831         if (stdout_debug) {
 832                 printf("AKA-AUTS: IMSI=%s AUTS=%s RAND=%s\n",
 833                        imsi, auts, __rand);
 834         }
 835         if (hexstr2bin(auts, _auts, EAP_AKA_AUTS_LEN) ||
 836             hexstr2bin(__rand, _rand, EAP_AKA_RAND_LEN)) {
 837                 printf("Could not parse AUTS/RAND\n");
 838                 return -1;
 839         }
 840
 841         m = get_milenage(imsi);
 842         if (m == NULL) {
 843                 printf("Unknown IMSI: %s\n", imsi);
 844                 return -1;
 845         }
 846
 847         if (milenage_auts(m->opc, m->ki, _rand, _auts, sqn)) {
 848                 printf("AKA-AUTS: Incorrect MAC-S\n");
 849         } else {
 850                 memcpy(m->sqn, sqn, 6);
 851                 if (stdout_debug) {
 852                         printf("AKA-AUTS: Re-synchronized: "
 853                                "SQN=%02x%02x%02x%02x%02x%02x\n",
 854                                sqn[0], sqn[1], sqn[2], sqn[3], sqn[4], sqn[5]);
 855                 }
 856 #ifdef CONFIG_SQLITE
 857                 db_update_milenage_sqn(m);
 858 #endif /* CONFIG_SQLITE */
 859                 sqn_changes = 1;
 860         }
 861
 862         return 0;
 863 }
 864
 865
 866 static int process_cmd(char *cmd, char *resp, size_t resp_len)
 867 {
 868         if (os_strncmp(cmd, "SIM-REQ-AUTH ", 13) == 0)
 869                 return sim_req_auth(cmd + 13, resp, resp_len);
 870
 871         if (os_strncmp(cmd, "GSM-AUTH-REQ ", 13) == 0)
 872                 return gsm_auth_req(cmd + 13, resp, resp_len);
 873
 874         if (os_strncmp(cmd, "AKA-REQ-AUTH ", 13) == 0)
 875                 return aka_req_auth(cmd + 13, resp, resp_len);
 876
 877         if (os_strncmp(cmd, "AKA-AUTS ", 9) == 0)
 878                 return aka_auts(cmd + 9, resp, resp_len);
 879
 880         printf("Unknown request: %s\n", cmd);
 881         return -1;
 882 }
 883
 884
 885 static int process(int s)
 886 {
 887         char buf[1000], resp[1000];
 888         struct sockaddr_un from;
 889         socklen_t fromlen;
 890         ssize_t res;
 891
 892         fromlen = sizeof(from);
 893         res = recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr *) &from,
 894                        &fromlen);
 895         if (res < 0) {
 896                 perror("recvfrom");
 897                 return -1;
 898         }
 899
 900         if (res == 0)
 901                 return 0;
 902
 903         if ((size_t) res >= sizeof(buf))
 904                 res = sizeof(buf) - 1;
 905         buf[res] = '\0';
 906
 907         printf("Received: %s\n", buf);
 908
 909         if (process_cmd(buf, resp, sizeof(resp)) < 0) {
 910                 printf("Failed to process request\n");
 911                 return -1;
 912         }
 913
 914         if (resp[0] == '\0') {
 915                 printf("No response\n");
 916                 return 0;
 917         }
 918
 919         printf("Send: %s\n", resp);
 920
 921         if (sendto(s, resp, os_strlen(resp), 0, (struct sockaddr *) &from,
 922                    fromlen) < 0)
 923                 perror("send");
 924
 925         return 0;
 926 }
 927
 928
 929 static void cleanup(void)
 930 {
 931         struct gsm_triplet *g, *gprev;
 932         struct milenage_parameters *m, *prev;
 933
 934         if (update_milenage && milenage_file && sqn_changes)
 935                 update_milenage_file(milenage_file);
 936
 937         g = gsm_db;
 938         while (g) {
 939                 gprev = g;
 940                 g = g->next;
 941                 os_free(gprev);
 942         }
 943
 944         m = milenage_db;
 945         while (m) {
 946                 prev = m;
 947                 m = m->next;
 948                 os_free(prev);
 949         }
 950
 951         if (serv_sock >= 0)
 952                 close(serv_sock);
 953         if (socket_path)
 954                 unlink(socket_path);
 955
 956 #ifdef CONFIG_SQLITE
 957         if (sqlite_db) {
 958                 sqlite3_close(sqlite_db);
 959                 sqlite_db = NULL;
 960         }
 961 #endif /* CONFIG_SQLITE */
 962 }
 963
 964
 965 static void handle_term(int sig)
 966 {
 967         printf("Signal %d - terminate\n", sig);
 968         exit(0);
 969 }
 970
 971
 972 static void usage(void)
 973 {
 974         printf("HLR/AuC testing gateway for hostapd EAP-SIM/AKA "
 975                "database/authenticator\n"
 976                "Copyright (c) 2005-2017, Jouni Malinen <j@w1.fi>\n"
 977                "\n"
 978                "usage:\n"
 979                "hlr_auc_gw [-hu] [-s<socket path>] [-g<triplet file>] "
 980                "[-m<milenage file>] \\\n"
 981                "        [-D<DB file>] [-i<IND len in bits>] [command]\n"
 982                "\n"
 983                "options:\n"
 984                "  -h = show this usage help\n"
 985                "  -u = update SQN in Milenage file on exit\n"
 986                "  -s<socket path> = path for UNIX domain socket\n"
 987                "                    (default: %s)\n"
 988                "  -g<triplet file> = path for GSM authentication triplets\n"
 989                "  -m<milenage file> = path for Milenage keys\n"
 990                "  -D<DB file> = path to SQLite database\n"
 991                "  -i<IND len in bits> = IND length for SQN (default: 5)\n"
 992                "\n"
 993                "If the optional command argument, like "
 994                "\"AKA-REQ-AUTH <IMSI>\" is used, a single\n"
 995                "command is processed with response sent to stdout. Otherwise, "
 996                "hlr_auc_gw opens\n"
 997                "a control interface and processes commands sent through it "
 998                "(e.g., by EAP server\n"
 999                "in hostapd).\n",
1000                default_socket_path);
1001 }
1002
1003
1004 int main(int argc, char *argv[])
1005 {
1006         int c;
1007         char *gsm_triplet_file = NULL;
1008         char *sqlite_db_file = NULL;
1009         int ret = 0;
1010
1011         if (os_program_init())
1012                 return -1;
1013
1014         socket_path = default_socket_path;
1015
1016         for (;;) {
1017                 c = getopt(argc, argv, "D:g:hi:m:s:u");
1018                 if (c < 0)
1019                         break;
1020                 switch (c) {
1021                 case 'D':
1022 #ifdef CONFIG_SQLITE
1023                         sqlite_db_file = optarg;
1024                         break;
1025 #else /* CONFIG_SQLITE */
1026                         printf("No SQLite support included in the build\n");
1027                         return -1;
1028 #endif /* CONFIG_SQLITE */
1029                 case 'g':
1030                         gsm_triplet_file = optarg;
1031                         break;
1032                 case 'h':
1033                         usage();
1034                         return 0;
1035                 case 'i':
1036                         ind_len = atoi(optarg);
1037                         if (ind_len < 0 || ind_len > 32) {
1038                                 printf("Invalid IND length\n");
1039                                 return -1;
1040                         }
1041                         break;
1042                 case 'm':
1043                         milenage_file = optarg;
1044                         break;
1045                 case 's':
1046                         socket_path = optarg;
1047                         break;
1048                 case 'u':
1049                         update_milenage = 1;
1050                         break;
1051                 default:
1052                         usage();
1053                         return -1;
1054                 }
1055         }
1056
1057         if (!gsm_triplet_file && !milenage_file && !sqlite_db_file) {
1058                 usage();
1059                 return -1;
1060         }
1061
1062 #ifdef CONFIG_SQLITE
1063         if (sqlite_db_file && (sqlite_db = db_open(sqlite_db_file)) == NULL)
1064                 return -1;
1065 #endif /* CONFIG_SQLITE */
1066
1067         if (gsm_triplet_file && read_gsm_triplets(gsm_triplet_file) < 0)
1068                 return -1;
1069
1070         if (milenage_file && read_milenage(milenage_file) < 0)
1071                 return -1;
1072
1073         if (optind == argc) {
1074                 serv_sock = open_socket(socket_path);
1075                 if (serv_sock < 0)
1076                         return -1;
1077
1078                 printf("Listening for requests on %s\n", socket_path);
1079
1080                 atexit(cleanup);
1081                 signal(SIGTERM, handle_term);
1082                 signal(SIGINT, handle_term);
1083
1084                 for (;;)
1085                         process(serv_sock);
1086         } else {
1087                 char buf[1000];
1088                 socket_path = NULL;
1089                 stdout_debug = 0;
1090                 if (process_cmd(argv[optind], buf, sizeof(buf)) < 0) {
1091                         printf("FAIL\n");
1092                         ret = -1;
1093                 } else {
1094                         printf("%s\n", buf);
1095                 }
1096                 cleanup();
1097         }
1098
1099 #ifdef CONFIG_SQLITE
1100         if (sqlite_db) {
1101                 sqlite3_close(sqlite_db);
1102                 sqlite_db = NULL;
1103         }
1104 #endif /* CONFIG_SQLITE */
1105
1106         os_program_deinit();
1107
1108         return ret;
1109 }