contrib/hostapd/src/tls/tlsv1_client.c

   1 /*
   2  * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
   3  * Copyright (c) 2006-2011, 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
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/sha1.h"
  13 #include "crypto/tls.h"
  14 #include "tlsv1_common.h"
  15 #include "tlsv1_record.h"
  16 #include "tlsv1_client.h"
  17 #include "tlsv1_client_i.h"
  18
  19 /* TODO:
  20  * Support for a message fragmented across several records (RFC 2246, 6.2.1)
  21  */
  22
  23
  24 void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
  25 {
  26         conn->alert_level = level;
  27         conn->alert_description = description;
  28 }
  29
  30
  31 void tlsv1_client_free_dh(struct tlsv1_client *conn)
  32 {
  33         os_free(conn->dh_p);
  34         os_free(conn->dh_g);
  35         os_free(conn->dh_ys);
  36         conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
  37 }
  38
  39
  40 int tls_derive_pre_master_secret(u8 *pre_master_secret)
  41 {
  42         WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
  43         if (os_get_random(pre_master_secret + 2,
  44                           TLS_PRE_MASTER_SECRET_LEN - 2))
  45                 return -1;
  46         return 0;
  47 }
  48
  49
  50 int tls_derive_keys(struct tlsv1_client *conn,
  51                     const u8 *pre_master_secret, size_t pre_master_secret_len)
  52 {
  53         u8 seed[2 * TLS_RANDOM_LEN];
  54         u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
  55         u8 *pos;
  56         size_t key_block_len;
  57
  58         if (pre_master_secret) {
  59                 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
  60                                 pre_master_secret, pre_master_secret_len);
  61                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
  62                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
  63                           TLS_RANDOM_LEN);
  64                 if (tls_prf(conn->rl.tls_version,
  65                             pre_master_secret, pre_master_secret_len,
  66                             "master secret", seed, 2 * TLS_RANDOM_LEN,
  67                             conn->master_secret, TLS_MASTER_SECRET_LEN)) {
  68                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
  69                                    "master_secret");
  70                         return -1;
  71                 }
  72                 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
  73                                 conn->master_secret, TLS_MASTER_SECRET_LEN);
  74         }
  75
  76         os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
  77         os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
  78         key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
  79         if (conn->rl.tls_version == TLS_VERSION_1)
  80                 key_block_len += 2 * conn->rl.iv_size;
  81         if (tls_prf(conn->rl.tls_version,
  82                     conn->master_secret, TLS_MASTER_SECRET_LEN,
  83                     "key expansion", seed, 2 * TLS_RANDOM_LEN,
  84                     key_block, key_block_len)) {
  85                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
  86                 return -1;
  87         }
  88         wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
  89                         key_block, key_block_len);
  90
  91         pos = key_block;
  92
  93         /* client_write_MAC_secret */
  94         os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
  95         pos += conn->rl.hash_size;
  96         /* server_write_MAC_secret */
  97         os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
  98         pos += conn->rl.hash_size;
  99
 100         /* client_write_key */
 101         os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
 102         pos += conn->rl.key_material_len;
 103         /* server_write_key */
 104         os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
 105         pos += conn->rl.key_material_len;
 106
 107         if (conn->rl.tls_version == TLS_VERSION_1) {
 108                 /* client_write_IV */
 109                 os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
 110                 pos += conn->rl.iv_size;
 111                 /* server_write_IV */
 112                 os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
 113                 pos += conn->rl.iv_size;
 114         } else {
 115                 /*
 116                  * Use IV field to set the mask value for TLS v1.1. A fixed
 117                  * mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
 118                  * Cipher option 2a.
 119                  */
 120                 os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
 121         }
 122
 123         return 0;
 124 }
 125
 126
 127 /**
 128  * tlsv1_client_handshake - Process TLS handshake
 129  * @conn: TLSv1 client connection data from tlsv1_client_init()
 130  * @in_data: Input data from TLS peer
 131  * @in_len: Input data length
 132  * @out_len: Length of the output buffer.
 133  * @appl_data: Pointer to application data pointer, or %NULL if dropped
 134  * @appl_data_len: Pointer to variable that is set to appl_data length
 135  * @need_more_data: Set to 1 if more data would be needed to complete
 136  *      processing
 137  * Returns: Pointer to output data, %NULL on failure
 138  */
 139 u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
 140                             const u8 *in_data, size_t in_len,
 141                             size_t *out_len, u8 **appl_data,
 142                             size_t *appl_data_len, int *need_more_data)
 143 {
 144         const u8 *pos, *end;
 145         u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
 146         size_t in_msg_len;
 147         int no_appl_data;
 148         int used;
 149
 150         if (need_more_data)
 151                 *need_more_data = 0;
 152
 153         if (conn->state == CLIENT_HELLO) {
 154                 if (in_len)
 155                         return NULL;
 156                 return tls_send_client_hello(conn, out_len);
 157         }
 158
 159         if (conn->partial_input) {
 160                 if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
 161                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 162                                    "memory for pending record");
 163                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 164                                   TLS_ALERT_INTERNAL_ERROR);
 165                         goto failed;
 166                 }
 167                 wpabuf_put_data(conn->partial_input, in_data, in_len);
 168                 in_data = wpabuf_head(conn->partial_input);
 169                 in_len = wpabuf_len(conn->partial_input);
 170         }
 171
 172         if (in_data == NULL || in_len == 0)
 173                 return NULL;
 174
 175         pos = in_data;
 176         end = in_data + in_len;
 177         in_msg = os_malloc(in_len);
 178         if (in_msg == NULL)
 179                 return NULL;
 180
 181         /* Each received packet may include multiple records */
 182         while (pos < end) {
 183                 in_msg_len = in_len;
 184                 used = tlsv1_record_receive(&conn->rl, pos, end - pos,
 185                                             in_msg, &in_msg_len, &alert);
 186                 if (used < 0) {
 187                         wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
 188                                    "record failed");
 189                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
 190                         goto failed;
 191                 }
 192                 if (used == 0) {
 193                         struct wpabuf *partial;
 194                         wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
 195                         partial = wpabuf_alloc_copy(pos, end - pos);
 196                         wpabuf_free(conn->partial_input);
 197                         conn->partial_input = partial;
 198                         if (conn->partial_input == NULL) {
 199                                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
 200                                            "allocate memory for pending "
 201                                            "record");
 202                                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 203                                           TLS_ALERT_INTERNAL_ERROR);
 204                                 goto failed;
 205                         }
 206                         os_free(in_msg);
 207                         if (need_more_data)
 208                                 *need_more_data = 1;
 209                         return NULL;
 210                 }
 211                 ct = pos[0];
 212
 213                 in_pos = in_msg;
 214                 in_end = in_msg + in_msg_len;
 215
 216                 /* Each received record may include multiple messages of the
 217                  * same ContentType. */
 218                 while (in_pos < in_end) {
 219                         in_msg_len = in_end - in_pos;
 220                         if (tlsv1_client_process_handshake(conn, ct, in_pos,
 221                                                            &in_msg_len,
 222                                                            appl_data,
 223                                                            appl_data_len) < 0)
 224                                 goto failed;
 225                         in_pos += in_msg_len;
 226                 }
 227
 228                 pos += used;
 229         }
 230
 231         os_free(in_msg);
 232         in_msg = NULL;
 233
 234         no_appl_data = appl_data == NULL || *appl_data == NULL;
 235         msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
 236
 237 failed:
 238         os_free(in_msg);
 239         if (conn->alert_level) {
 240                 wpabuf_free(conn->partial_input);
 241                 conn->partial_input = NULL;
 242                 conn->state = FAILED;
 243                 os_free(msg);
 244                 msg = tlsv1_client_send_alert(conn, conn->alert_level,
 245                                               conn->alert_description,
 246                                               out_len);
 247         } else if (msg == NULL) {
 248                 msg = os_zalloc(1);
 249                 *out_len = 0;
 250         }
 251
 252         if (need_more_data == NULL || !(*need_more_data)) {
 253                 wpabuf_free(conn->partial_input);
 254                 conn->partial_input = NULL;
 255         }
 256
 257         return msg;
 258 }
 259
 260
 261 /**
 262  * tlsv1_client_encrypt - Encrypt data into TLS tunnel
 263  * @conn: TLSv1 client connection data from tlsv1_client_init()
 264  * @in_data: Pointer to plaintext data to be encrypted
 265  * @in_len: Input buffer length
 266  * @out_data: Pointer to output buffer (encrypted TLS data)
 267  * @out_len: Maximum out_data length
 268  * Returns: Number of bytes written to out_data, -1 on failure
 269  *
 270  * This function is used after TLS handshake has been completed successfully to
 271  * send data in the encrypted tunnel.
 272  */
 273 int tlsv1_client_encrypt(struct tlsv1_client *conn,
 274                          const u8 *in_data, size_t in_len,
 275                          u8 *out_data, size_t out_len)
 276 {
 277         size_t rlen;
 278
 279         wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
 280                         in_data, in_len);
 281
 282         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
 283                               out_data, out_len, in_data, in_len, &rlen) < 0) {
 284                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
 285                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 286                           TLS_ALERT_INTERNAL_ERROR);
 287                 return -1;
 288         }
 289
 290         return rlen;
 291 }
 292
 293
 294 /**
 295  * tlsv1_client_decrypt - Decrypt data from TLS tunnel
 296  * @conn: TLSv1 client connection data from tlsv1_client_init()
 297  * @in_data: Pointer to input buffer (encrypted TLS data)
 298  * @in_len: Input buffer length
 299  * @need_more_data: Set to 1 if more data would be needed to complete
 300  *      processing
 301  * Returns: Decrypted data or %NULL on failure
 302  *
 303  * This function is used after TLS handshake has been completed successfully to
 304  * receive data from the encrypted tunnel.
 305  */
 306 struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
 307                                      const u8 *in_data, size_t in_len,
 308                                      int *need_more_data)
 309 {
 310         const u8 *in_end, *pos;
 311         int used;
 312         u8 alert, *out_pos, ct;
 313         size_t olen;
 314         struct wpabuf *buf = NULL;
 315
 316         if (need_more_data)
 317                 *need_more_data = 0;
 318
 319         if (conn->partial_input) {
 320                 if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
 321                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 322                                    "memory for pending record");
 323                         alert = TLS_ALERT_INTERNAL_ERROR;
 324                         goto fail;
 325                 }
 326                 wpabuf_put_data(conn->partial_input, in_data, in_len);
 327                 in_data = wpabuf_head(conn->partial_input);
 328                 in_len = wpabuf_len(conn->partial_input);
 329         }
 330
 331         pos = in_data;
 332         in_end = in_data + in_len;
 333
 334         while (pos < in_end) {
 335                 ct = pos[0];
 336                 if (wpabuf_resize(&buf, in_end - pos) < 0) {
 337                         alert = TLS_ALERT_INTERNAL_ERROR;
 338                         goto fail;
 339                 }
 340                 out_pos = wpabuf_put(buf, 0);
 341                 olen = wpabuf_tailroom(buf);
 342                 used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
 343                                             out_pos, &olen, &alert);
 344                 if (used < 0) {
 345                         wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
 346                                    "failed");
 347                         goto fail;
 348                 }
 349                 if (used == 0) {
 350                         struct wpabuf *partial;
 351                         wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
 352                         partial = wpabuf_alloc_copy(pos, in_end - pos);
 353                         wpabuf_free(conn->partial_input);
 354                         conn->partial_input = partial;
 355                         if (conn->partial_input == NULL) {
 356                                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
 357                                            "allocate memory for pending "
 358                                            "record");
 359                                 alert = TLS_ALERT_INTERNAL_ERROR;
 360                                 goto fail;
 361                         }
 362                         if (need_more_data)
 363                                 *need_more_data = 1;
 364                         return buf;
 365                 }
 366
 367                 if (ct == TLS_CONTENT_TYPE_ALERT) {
 368                         if (olen < 2) {
 369                                 wpa_printf(MSG_DEBUG, "TLSv1: Alert "
 370                                            "underflow");
 371                                 alert = TLS_ALERT_DECODE_ERROR;
 372                                 goto fail;
 373                         }
 374                         wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
 375                                    out_pos[0], out_pos[1]);
 376                         if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
 377                                 /* Continue processing */
 378                                 pos += used;
 379                                 continue;
 380                         }
 381
 382                         alert = out_pos[1];
 383                         goto fail;
 384                 }
 385
 386                 if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
 387                         wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
 388                                    "0x%x when decrypting application data",
 389                                    pos[0]);
 390                         alert = TLS_ALERT_UNEXPECTED_MESSAGE;
 391                         goto fail;
 392                 }
 393
 394                 wpabuf_put(buf, olen);
 395
 396                 pos += used;
 397         }
 398
 399         wpabuf_free(conn->partial_input);
 400         conn->partial_input = NULL;
 401         return buf;
 402
 403 fail:
 404         wpabuf_free(buf);
 405         wpabuf_free(conn->partial_input);
 406         conn->partial_input = NULL;
 407         tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
 408         return NULL;
 409 }
 410
 411
 412 /**
 413  * tlsv1_client_global_init - Initialize TLSv1 client
 414  * Returns: 0 on success, -1 on failure
 415  *
 416  * This function must be called before using any other TLSv1 client functions.
 417  */
 418 int tlsv1_client_global_init(void)
 419 {
 420         return crypto_global_init();
 421 }
 422
 423
 424 /**
 425  * tlsv1_client_global_deinit - Deinitialize TLSv1 client
 426  *
 427  * This function can be used to deinitialize the TLSv1 client that was
 428  * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
 429  * can be called after this before calling tlsv1_client_global_init() again.
 430  */
 431 void tlsv1_client_global_deinit(void)
 432 {
 433         crypto_global_deinit();
 434 }
 435
 436
 437 /**
 438  * tlsv1_client_init - Initialize TLSv1 client connection
 439  * Returns: Pointer to TLSv1 client connection data or %NULL on failure
 440  */
 441 struct tlsv1_client * tlsv1_client_init(void)
 442 {
 443         struct tlsv1_client *conn;
 444         size_t count;
 445         u16 *suites;
 446
 447         conn = os_zalloc(sizeof(*conn));
 448         if (conn == NULL)
 449                 return NULL;
 450
 451         conn->state = CLIENT_HELLO;
 452
 453         if (tls_verify_hash_init(&conn->verify) < 0) {
 454                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
 455                            "hash");
 456                 os_free(conn);
 457                 return NULL;
 458         }
 459
 460         count = 0;
 461         suites = conn->cipher_suites;
 462         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
 463         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
 464         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
 465         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
 466         suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
 467         suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
 468         suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
 469         conn->num_cipher_suites = count;
 470
 471         conn->rl.tls_version = TLS_VERSION;
 472
 473         return conn;
 474 }
 475
 476
 477 /**
 478  * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 479  * @conn: TLSv1 client connection data from tlsv1_client_init()
 480  */
 481 void tlsv1_client_deinit(struct tlsv1_client *conn)
 482 {
 483         crypto_public_key_free(conn->server_rsa_key);
 484         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 485         tlsv1_record_change_write_cipher(&conn->rl);
 486         tlsv1_record_change_read_cipher(&conn->rl);
 487         tls_verify_hash_free(&conn->verify);
 488         os_free(conn->client_hello_ext);
 489         tlsv1_client_free_dh(conn);
 490         tlsv1_cred_free(conn->cred);
 491         wpabuf_free(conn->partial_input);
 492         os_free(conn);
 493 }
 494
 495
 496 /**
 497  * tlsv1_client_established - Check whether connection has been established
 498  * @conn: TLSv1 client connection data from tlsv1_client_init()
 499  * Returns: 1 if connection is established, 0 if not
 500  */
 501 int tlsv1_client_established(struct tlsv1_client *conn)
 502 {
 503         return conn->state == ESTABLISHED;
 504 }
 505
 506
 507 /**
 508  * tlsv1_client_prf - Use TLS-PRF to derive keying material
 509  * @conn: TLSv1 client connection data from tlsv1_client_init()
 510  * @label: Label (e.g., description of the key) for PRF
 511  * @server_random_first: seed is 0 = client_random|server_random,
 512  * 1 = server_random|client_random
 513  * @out: Buffer for output data from TLS-PRF
 514  * @out_len: Length of the output buffer
 515  * Returns: 0 on success, -1 on failure
 516  */
 517 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
 518                      int server_random_first, u8 *out, size_t out_len)
 519 {
 520         u8 seed[2 * TLS_RANDOM_LEN];
 521
 522         if (conn->state != ESTABLISHED)
 523                 return -1;
 524
 525         if (server_random_first) {
 526                 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
 527                 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
 528                           TLS_RANDOM_LEN);
 529         } else {
 530                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
 531                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
 532                           TLS_RANDOM_LEN);
 533         }
 534
 535         return tls_prf(conn->rl.tls_version,
 536                        conn->master_secret, TLS_MASTER_SECRET_LEN,
 537                        label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
 538 }
 539
 540
 541 /**
 542  * tlsv1_client_get_cipher - Get current cipher name
 543  * @conn: TLSv1 client connection data from tlsv1_client_init()
 544  * @buf: Buffer for the cipher name
 545  * @buflen: buf size
 546  * Returns: 0 on success, -1 on failure
 547  *
 548  * Get the name of the currently used cipher.
 549  */
 550 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
 551                             size_t buflen)
 552 {
 553         char *cipher;
 554
 555         switch (conn->rl.cipher_suite) {
 556         case TLS_RSA_WITH_RC4_128_MD5:
 557                 cipher = "RC4-MD5";
 558                 break;
 559         case TLS_RSA_WITH_RC4_128_SHA:
 560                 cipher = "RC4-SHA";
 561                 break;
 562         case TLS_RSA_WITH_DES_CBC_SHA:
 563                 cipher = "DES-CBC-SHA";
 564                 break;
 565         case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
 566                 cipher = "DES-CBC3-SHA";
 567                 break;
 568         case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
 569                 cipher = "ADH-AES-128-SHA256";
 570                 break;
 571         case TLS_DH_anon_WITH_AES_128_CBC_SHA:
 572                 cipher = "ADH-AES-128-SHA";
 573                 break;
 574         case TLS_RSA_WITH_AES_256_CBC_SHA:
 575                 cipher = "AES-256-SHA";
 576                 break;
 577         case TLS_RSA_WITH_AES_256_CBC_SHA256:
 578                 cipher = "AES-256-SHA256";
 579                 break;
 580         case TLS_RSA_WITH_AES_128_CBC_SHA:
 581                 cipher = "AES-128-SHA";
 582                 break;
 583         case TLS_RSA_WITH_AES_128_CBC_SHA256:
 584                 cipher = "AES-128-SHA256";
 585                 break;
 586         default:
 587                 return -1;
 588         }
 589
 590         if (os_strlcpy(buf, cipher, buflen) >= buflen)
 591                 return -1;
 592         return 0;
 593 }
 594
 595
 596 /**
 597  * tlsv1_client_shutdown - Shutdown TLS connection
 598  * @conn: TLSv1 client connection data from tlsv1_client_init()
 599  * Returns: 0 on success, -1 on failure
 600  */
 601 int tlsv1_client_shutdown(struct tlsv1_client *conn)
 602 {
 603         conn->state = CLIENT_HELLO;
 604
 605         if (tls_verify_hash_init(&conn->verify) < 0) {
 606                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
 607                            "hash");
 608                 return -1;
 609         }
 610
 611         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 612         tlsv1_record_change_write_cipher(&conn->rl);
 613         tlsv1_record_change_read_cipher(&conn->rl);
 614
 615         conn->certificate_requested = 0;
 616         crypto_public_key_free(conn->server_rsa_key);
 617         conn->server_rsa_key = NULL;
 618         conn->session_resumed = 0;
 619
 620         return 0;
 621 }
 622
 623
 624 /**
 625  * tlsv1_client_resumed - Was session resumption used
 626  * @conn: TLSv1 client connection data from tlsv1_client_init()
 627  * Returns: 1 if current session used session resumption, 0 if not
 628  */
 629 int tlsv1_client_resumed(struct tlsv1_client *conn)
 630 {
 631         return !!conn->session_resumed;
 632 }
 633
 634
 635 /**
 636  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 637  * @conn: TLSv1 client connection data from tlsv1_client_init()
 638  * @ext_type: Extension type
 639  * @data: Extension payload (%NULL to remove extension)
 640  * @data_len: Extension payload length
 641  * Returns: 0 on success, -1 on failure
 642  */
 643 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
 644                            const u8 *data, size_t data_len)
 645 {
 646         u8 *pos;
 647
 648         conn->session_ticket_included = 0;
 649         os_free(conn->client_hello_ext);
 650         conn->client_hello_ext = NULL;
 651         conn->client_hello_ext_len = 0;
 652
 653         if (data == NULL || data_len == 0)
 654                 return 0;
 655
 656         pos = conn->client_hello_ext = os_malloc(6 + data_len);
 657         if (pos == NULL)
 658                 return -1;
 659
 660         WPA_PUT_BE16(pos, 4 + data_len);
 661         pos += 2;
 662         WPA_PUT_BE16(pos, ext_type);
 663         pos += 2;
 664         WPA_PUT_BE16(pos, data_len);
 665         pos += 2;
 666         os_memcpy(pos, data, data_len);
 667         conn->client_hello_ext_len = 6 + data_len;
 668
 669         if (ext_type == TLS_EXT_PAC_OPAQUE) {
 670                 conn->session_ticket_included = 1;
 671                 wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
 672         }
 673
 674         return 0;
 675 }
 676
 677
 678 /**
 679  * tlsv1_client_get_keys - Get master key and random data from TLS connection
 680  * @conn: TLSv1 client connection data from tlsv1_client_init()
 681  * @keys: Structure of key/random data (filled on success)
 682  * Returns: 0 on success, -1 on failure
 683  */
 684 int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
 685 {
 686         os_memset(keys, 0, sizeof(*keys));
 687         if (conn->state == CLIENT_HELLO)
 688                 return -1;
 689
 690         keys->client_random = conn->client_random;
 691         keys->client_random_len = TLS_RANDOM_LEN;
 692
 693         if (conn->state != SERVER_HELLO) {
 694                 keys->server_random = conn->server_random;
 695                 keys->server_random_len = TLS_RANDOM_LEN;
 696                 keys->master_key = conn->master_secret;
 697                 keys->master_key_len = TLS_MASTER_SECRET_LEN;
 698         }
 699
 700         return 0;
 701 }
 702
 703
 704 /**
 705  * tlsv1_client_get_keyblock_size - Get TLS key_block size
 706  * @conn: TLSv1 client connection data from tlsv1_client_init()
 707  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 708  * failure
 709  */
 710 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
 711 {
 712         if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
 713                 return -1;
 714
 715         return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
 716                     conn->rl.iv_size);
 717 }
 718
 719
 720 /**
 721  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 722  * @conn: TLSv1 client connection data from tlsv1_client_init()
 723  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 724  * (TLS_CIPHER_*).
 725  * Returns: 0 on success, -1 on failure
 726  */
 727 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
 728 {
 729         size_t count;
 730         u16 *suites;
 731
 732         /* TODO: implement proper configuration of cipher suites */
 733         if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
 734                 count = 0;
 735                 suites = conn->cipher_suites;
 736                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
 737                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
 738                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
 739                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 740                 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
 741                 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
 742                 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
 743
 744                 /*
 745                  * Cisco AP (at least 350 and 1200 series) local authentication
 746                  * server does not know how to search cipher suites from the
 747                  * list and seem to require that the last entry in the list is
 748                  * the one that it wants to use. However, TLS specification
 749                  * requires the list to be in the client preference order. As a
 750                  * workaround, add anon-DH AES-128-SHA1 again at the end of the
 751                  * list to allow the Cisco code to find it.
 752                  */
 753                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 754                 conn->num_cipher_suites = count;
 755         }
 756
 757         return 0;
 758 }
 759
 760
 761 /**
 762  * tlsv1_client_set_cred - Set client credentials
 763  * @conn: TLSv1 client connection data from tlsv1_client_init()
 764  * @cred: Credentials from tlsv1_cred_alloc()
 765  * Returns: 0 on success, -1 on failure
 766  *
 767  * On success, the client takes ownership of the credentials block and caller
 768  * must not free it. On failure, caller is responsible for freeing the
 769  * credential block.
 770  */
 771 int tlsv1_client_set_cred(struct tlsv1_client *conn,
 772                           struct tlsv1_credentials *cred)
 773 {
 774         tlsv1_cred_free(conn->cred);
 775         conn->cred = cred;
 776         return 0;
 777 }
 778
 779
 780 void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
 781 {
 782         conn->disable_time_checks = !enabled;
 783 }
 784
 785
 786 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
 787                                         tlsv1_client_session_ticket_cb cb,
 788                                         void *ctx)
 789 {
 790         wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
 791                    cb, ctx);
 792         conn->session_ticket_cb = cb;
 793         conn->session_ticket_cb_ctx = ctx;
 794 }