src/tls/tlsv1_client.c

   1 /*
   2  * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
   3  * Copyright (c) 2006-2015, 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 "x509v3.h"
  15 #include "tlsv1_common.h"
  16 #include "tlsv1_record.h"
  17 #include "tlsv1_client.h"
  18 #include "tlsv1_client_i.h"
  19
  20 /* TODO:
  21  * Support for a message fragmented across several records (RFC 2246, 6.2.1)
  22  */
  23
  24
  25 void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
  26 {
  27         conn->alert_level = level;
  28         conn->alert_description = description;
  29 }
  30
  31
  32 void tlsv1_client_free_dh(struct tlsv1_client *conn)
  33 {
  34         os_free(conn->dh_p);
  35         os_free(conn->dh_g);
  36         os_free(conn->dh_ys);
  37         conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
  38 }
  39
  40
  41 int tls_derive_pre_master_secret(u8 *pre_master_secret)
  42 {
  43         WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
  44         if (os_get_random(pre_master_secret + 2,
  45                           TLS_PRE_MASTER_SECRET_LEN - 2))
  46                 return -1;
  47         return 0;
  48 }
  49
  50
  51 int tls_derive_keys(struct tlsv1_client *conn,
  52                     const u8 *pre_master_secret, size_t pre_master_secret_len)
  53 {
  54         u8 seed[2 * TLS_RANDOM_LEN];
  55         u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
  56         u8 *pos;
  57         size_t key_block_len;
  58
  59         if (pre_master_secret) {
  60                 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
  61                                 pre_master_secret, pre_master_secret_len);
  62                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
  63                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
  64                           TLS_RANDOM_LEN);
  65                 if (tls_prf(conn->rl.tls_version,
  66                             pre_master_secret, pre_master_secret_len,
  67                             "master secret", seed, 2 * TLS_RANDOM_LEN,
  68                             conn->master_secret, TLS_MASTER_SECRET_LEN)) {
  69                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
  70                                    "master_secret");
  71                         return -1;
  72                 }
  73                 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
  74                                 conn->master_secret, TLS_MASTER_SECRET_LEN);
  75         }
  76
  77         os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
  78         os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
  79         key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
  80         if (conn->rl.tls_version == TLS_VERSION_1)
  81                 key_block_len += 2 * conn->rl.iv_size;
  82         if (tls_prf(conn->rl.tls_version,
  83                     conn->master_secret, TLS_MASTER_SECRET_LEN,
  84                     "key expansion", seed, 2 * TLS_RANDOM_LEN,
  85                     key_block, key_block_len)) {
  86                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
  87                 return -1;
  88         }
  89         wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
  90                         key_block, key_block_len);
  91
  92         pos = key_block;
  93
  94         /* client_write_MAC_secret */
  95         os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
  96         pos += conn->rl.hash_size;
  97         /* server_write_MAC_secret */
  98         os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
  99         pos += conn->rl.hash_size;
 100
 101         /* client_write_key */
 102         os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
 103         pos += conn->rl.key_material_len;
 104         /* server_write_key */
 105         os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
 106         pos += conn->rl.key_material_len;
 107
 108         if (conn->rl.tls_version == TLS_VERSION_1) {
 109                 /* client_write_IV */
 110                 os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
 111                 pos += conn->rl.iv_size;
 112                 /* server_write_IV */
 113                 os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
 114                 pos += conn->rl.iv_size;
 115         } else {
 116                 /*
 117                  * Use IV field to set the mask value for TLS v1.1. A fixed
 118                  * mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
 119                  * Cipher option 2a.
 120                  */
 121                 os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
 122         }
 123
 124         return 0;
 125 }
 126
 127
 128 /**
 129  * tlsv1_client_handshake - Process TLS handshake
 130  * @conn: TLSv1 client connection data from tlsv1_client_init()
 131  * @in_data: Input data from TLS peer
 132  * @in_len: Input data length
 133  * @out_len: Length of the output buffer.
 134  * @appl_data: Pointer to application data pointer, or %NULL if dropped
 135  * @appl_data_len: Pointer to variable that is set to appl_data length
 136  * @need_more_data: Set to 1 if more data would be needed to complete
 137  *      processing
 138  * Returns: Pointer to output data, %NULL on failure
 139  */
 140 u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
 141                             const u8 *in_data, size_t in_len,
 142                             size_t *out_len, u8 **appl_data,
 143                             size_t *appl_data_len, int *need_more_data)
 144 {
 145         const u8 *pos, *end;
 146         u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
 147         size_t in_msg_len;
 148         int no_appl_data;
 149         int used;
 150
 151         if (need_more_data)
 152                 *need_more_data = 0;
 153
 154         if (conn->state == CLIENT_HELLO) {
 155                 if (in_len)
 156                         return NULL;
 157                 return tls_send_client_hello(conn, out_len);
 158         }
 159
 160         if (conn->partial_input) {
 161                 if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
 162                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 163                                    "memory for pending record");
 164                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 165                                   TLS_ALERT_INTERNAL_ERROR);
 166                         goto failed;
 167                 }
 168                 wpabuf_put_data(conn->partial_input, in_data, in_len);
 169                 in_data = wpabuf_head(conn->partial_input);
 170                 in_len = wpabuf_len(conn->partial_input);
 171         }
 172
 173         if (in_data == NULL || in_len == 0)
 174                 return NULL;
 175
 176         pos = in_data;
 177         end = in_data + in_len;
 178         in_msg = os_malloc(in_len);
 179         if (in_msg == NULL)
 180                 return NULL;
 181
 182         /* Each received packet may include multiple records */
 183         while (pos < end) {
 184                 in_msg_len = in_len;
 185                 used = tlsv1_record_receive(&conn->rl, pos, end - pos,
 186                                             in_msg, &in_msg_len, &alert);
 187                 if (used < 0) {
 188                         wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
 189                                    "record failed");
 190                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
 191                         goto failed;
 192                 }
 193                 if (used == 0) {
 194                         struct wpabuf *partial;
 195                         wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
 196                         partial = wpabuf_alloc_copy(pos, end - pos);
 197                         wpabuf_free(conn->partial_input);
 198                         conn->partial_input = partial;
 199                         if (conn->partial_input == NULL) {
 200                                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
 201                                            "allocate memory for pending "
 202                                            "record");
 203                                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 204                                           TLS_ALERT_INTERNAL_ERROR);
 205                                 goto failed;
 206                         }
 207                         os_free(in_msg);
 208                         if (need_more_data)
 209                                 *need_more_data = 1;
 210                         return NULL;
 211                 }
 212                 ct = pos[0];
 213
 214                 in_pos = in_msg;
 215                 in_end = in_msg + in_msg_len;
 216
 217                 /* Each received record may include multiple messages of the
 218                  * same ContentType. */
 219                 while (in_pos < in_end) {
 220                         in_msg_len = in_end - in_pos;
 221                         if (tlsv1_client_process_handshake(conn, ct, in_pos,
 222                                                            &in_msg_len,
 223                                                            appl_data,
 224                                                            appl_data_len) < 0)
 225                                 goto failed;
 226                         in_pos += in_msg_len;
 227                 }
 228
 229                 pos += used;
 230         }
 231
 232         os_free(in_msg);
 233         in_msg = NULL;
 234
 235         no_appl_data = appl_data == NULL || *appl_data == NULL;
 236         msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
 237
 238 failed:
 239         os_free(in_msg);
 240         if (conn->alert_level) {
 241                 wpabuf_free(conn->partial_input);
 242                 conn->partial_input = NULL;
 243                 conn->state = FAILED;
 244                 os_free(msg);
 245                 msg = tlsv1_client_send_alert(conn, conn->alert_level,
 246                                               conn->alert_description,
 247                                               out_len);
 248         } else if (msg == NULL) {
 249                 msg = os_zalloc(1);
 250                 *out_len = 0;
 251         }
 252
 253         if (need_more_data == NULL || !(*need_more_data)) {
 254                 wpabuf_free(conn->partial_input);
 255                 conn->partial_input = NULL;
 256         }
 257
 258         return msg;
 259 }
 260
 261
 262 /**
 263  * tlsv1_client_encrypt - Encrypt data into TLS tunnel
 264  * @conn: TLSv1 client connection data from tlsv1_client_init()
 265  * @in_data: Pointer to plaintext data to be encrypted
 266  * @in_len: Input buffer length
 267  * @out_data: Pointer to output buffer (encrypted TLS data)
 268  * @out_len: Maximum out_data length
 269  * Returns: Number of bytes written to out_data, -1 on failure
 270  *
 271  * This function is used after TLS handshake has been completed successfully to
 272  * send data in the encrypted tunnel.
 273  */
 274 int tlsv1_client_encrypt(struct tlsv1_client *conn,
 275                          const u8 *in_data, size_t in_len,
 276                          u8 *out_data, size_t out_len)
 277 {
 278         size_t rlen;
 279
 280         wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
 281                         in_data, in_len);
 282
 283         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
 284                               out_data, out_len, in_data, in_len, &rlen) < 0) {
 285                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
 286                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 287                           TLS_ALERT_INTERNAL_ERROR);
 288                 return -1;
 289         }
 290
 291         return rlen;
 292 }
 293
 294
 295 /**
 296  * tlsv1_client_decrypt - Decrypt data from TLS tunnel
 297  * @conn: TLSv1 client connection data from tlsv1_client_init()
 298  * @in_data: Pointer to input buffer (encrypted TLS data)
 299  * @in_len: Input buffer length
 300  * @need_more_data: Set to 1 if more data would be needed to complete
 301  *      processing
 302  * Returns: Decrypted data or %NULL on failure
 303  *
 304  * This function is used after TLS handshake has been completed successfully to
 305  * receive data from the encrypted tunnel.
 306  */
 307 struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
 308                                      const u8 *in_data, size_t in_len,
 309                                      int *need_more_data)
 310 {
 311         const u8 *in_end, *pos;
 312         int used;
 313         u8 alert, *out_pos, ct;
 314         size_t olen;
 315         struct wpabuf *buf = NULL;
 316
 317         if (need_more_data)
 318                 *need_more_data = 0;
 319
 320         if (conn->partial_input) {
 321                 if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
 322                         wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 323                                    "memory for pending record");
 324                         alert = TLS_ALERT_INTERNAL_ERROR;
 325                         goto fail;
 326                 }
 327                 wpabuf_put_data(conn->partial_input, in_data, in_len);
 328                 in_data = wpabuf_head(conn->partial_input);
 329                 in_len = wpabuf_len(conn->partial_input);
 330         }
 331
 332         pos = in_data;
 333         in_end = in_data + in_len;
 334
 335         while (pos < in_end) {
 336                 ct = pos[0];
 337                 if (wpabuf_resize(&buf, in_end - pos) < 0) {
 338                         alert = TLS_ALERT_INTERNAL_ERROR;
 339                         goto fail;
 340                 }
 341                 out_pos = wpabuf_put(buf, 0);
 342                 olen = wpabuf_tailroom(buf);
 343                 used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
 344                                             out_pos, &olen, &alert);
 345                 if (used < 0) {
 346                         wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
 347                                    "failed");
 348                         goto fail;
 349                 }
 350                 if (used == 0) {
 351                         struct wpabuf *partial;
 352                         wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
 353                         partial = wpabuf_alloc_copy(pos, in_end - pos);
 354                         wpabuf_free(conn->partial_input);
 355                         conn->partial_input = partial;
 356                         if (conn->partial_input == NULL) {
 357                                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
 358                                            "allocate memory for pending "
 359                                            "record");
 360                                 alert = TLS_ALERT_INTERNAL_ERROR;
 361                                 goto fail;
 362                         }
 363                         if (need_more_data)
 364                                 *need_more_data = 1;
 365                         return buf;
 366                 }
 367
 368                 if (ct == TLS_CONTENT_TYPE_ALERT) {
 369                         if (olen < 2) {
 370                                 wpa_printf(MSG_DEBUG, "TLSv1: Alert "
 371                                            "underflow");
 372                                 alert = TLS_ALERT_DECODE_ERROR;
 373                                 goto fail;
 374                         }
 375                         wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
 376                                    out_pos[0], out_pos[1]);
 377                         if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
 378                                 /* Continue processing */
 379                                 pos += used;
 380                                 continue;
 381                         }
 382
 383                         alert = out_pos[1];
 384                         goto fail;
 385                 }
 386
 387                 if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
 388                         wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
 389                                    "0x%x when decrypting application data",
 390                                    pos[0]);
 391                         alert = TLS_ALERT_UNEXPECTED_MESSAGE;
 392                         goto fail;
 393                 }
 394
 395                 wpabuf_put(buf, olen);
 396
 397                 pos += used;
 398         }
 399
 400         wpabuf_free(conn->partial_input);
 401         conn->partial_input = NULL;
 402         return buf;
 403
 404 fail:
 405         wpabuf_free(buf);
 406         wpabuf_free(conn->partial_input);
 407         conn->partial_input = NULL;
 408         tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
 409         return NULL;
 410 }
 411
 412
 413 /**
 414  * tlsv1_client_global_init - Initialize TLSv1 client
 415  * Returns: 0 on success, -1 on failure
 416  *
 417  * This function must be called before using any other TLSv1 client functions.
 418  */
 419 int tlsv1_client_global_init(void)
 420 {
 421         return crypto_global_init();
 422 }
 423
 424
 425 /**
 426  * tlsv1_client_global_deinit - Deinitialize TLSv1 client
 427  *
 428  * This function can be used to deinitialize the TLSv1 client that was
 429  * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
 430  * can be called after this before calling tlsv1_client_global_init() again.
 431  */
 432 void tlsv1_client_global_deinit(void)
 433 {
 434         crypto_global_deinit();
 435 }
 436
 437
 438 /**
 439  * tlsv1_client_init - Initialize TLSv1 client connection
 440  * Returns: Pointer to TLSv1 client connection data or %NULL on failure
 441  */
 442 struct tlsv1_client * tlsv1_client_init(void)
 443 {
 444         struct tlsv1_client *conn;
 445         size_t count;
 446         u16 *suites;
 447
 448         conn = os_zalloc(sizeof(*conn));
 449         if (conn == NULL)
 450                 return NULL;
 451
 452         conn->state = CLIENT_HELLO;
 453
 454         if (tls_verify_hash_init(&conn->verify) < 0) {
 455                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
 456                            "hash");
 457                 os_free(conn);
 458                 return NULL;
 459         }
 460
 461         count = 0;
 462         suites = conn->cipher_suites;
 463         suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA256;
 464         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
 465         suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
 466         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
 467         suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
 468         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
 469         suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
 470         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
 471         suites[count++] = TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
 472         suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
 473         suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
 474         suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
 475         conn->num_cipher_suites = count;
 476
 477         conn->rl.tls_version = TLS_VERSION;
 478
 479         return conn;
 480 }
 481
 482
 483 /**
 484  * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 485  * @conn: TLSv1 client connection data from tlsv1_client_init()
 486  */
 487 void tlsv1_client_deinit(struct tlsv1_client *conn)
 488 {
 489         crypto_public_key_free(conn->server_rsa_key);
 490         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 491         tlsv1_record_change_write_cipher(&conn->rl);
 492         tlsv1_record_change_read_cipher(&conn->rl);
 493         tls_verify_hash_free(&conn->verify);
 494         os_free(conn->client_hello_ext);
 495         tlsv1_client_free_dh(conn);
 496         tlsv1_cred_free(conn->cred);
 497         wpabuf_free(conn->partial_input);
 498         x509_certificate_chain_free(conn->server_cert);
 499         os_free(conn);
 500 }
 501
 502
 503 /**
 504  * tlsv1_client_established - Check whether connection has been established
 505  * @conn: TLSv1 client connection data from tlsv1_client_init()
 506  * Returns: 1 if connection is established, 0 if not
 507  */
 508 int tlsv1_client_established(struct tlsv1_client *conn)
 509 {
 510         return conn->state == ESTABLISHED;
 511 }
 512
 513
 514 /**
 515  * tlsv1_client_prf - Use TLS-PRF to derive keying material
 516  * @conn: TLSv1 client connection data from tlsv1_client_init()
 517  * @label: Label (e.g., description of the key) for PRF
 518  * @server_random_first: seed is 0 = client_random|server_random,
 519  * 1 = server_random|client_random
 520  * @out: Buffer for output data from TLS-PRF
 521  * @out_len: Length of the output buffer
 522  * Returns: 0 on success, -1 on failure
 523  */
 524 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
 525                      int server_random_first, u8 *out, size_t out_len)
 526 {
 527         u8 seed[2 * TLS_RANDOM_LEN];
 528
 529         if (conn->state != ESTABLISHED)
 530                 return -1;
 531
 532         if (server_random_first) {
 533                 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
 534                 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
 535                           TLS_RANDOM_LEN);
 536         } else {
 537                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
 538                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
 539                           TLS_RANDOM_LEN);
 540         }
 541
 542         return tls_prf(conn->rl.tls_version,
 543                        conn->master_secret, TLS_MASTER_SECRET_LEN,
 544                        label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
 545 }
 546
 547
 548 /**
 549  * tlsv1_client_get_cipher - Get current cipher name
 550  * @conn: TLSv1 client connection data from tlsv1_client_init()
 551  * @buf: Buffer for the cipher name
 552  * @buflen: buf size
 553  * Returns: 0 on success, -1 on failure
 554  *
 555  * Get the name of the currently used cipher.
 556  */
 557 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
 558                             size_t buflen)
 559 {
 560         char *cipher;
 561
 562         switch (conn->rl.cipher_suite) {
 563         case TLS_RSA_WITH_RC4_128_MD5:
 564                 cipher = "RC4-MD5";
 565                 break;
 566         case TLS_RSA_WITH_RC4_128_SHA:
 567                 cipher = "RC4-SHA";
 568                 break;
 569         case TLS_RSA_WITH_DES_CBC_SHA:
 570                 cipher = "DES-CBC-SHA";
 571                 break;
 572         case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
 573                 cipher = "DES-CBC3-SHA";
 574                 break;
 575         case TLS_DHE_RSA_WITH_DES_CBC_SHA:
 576                 cipher = "DHE-RSA-DES-CBC-SHA";
 577                 break;
 578         case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
 579                 cipher = "DHE-RSA-DES-CBC3-SHA";
 580                 break;
 581         case TLS_DH_anon_WITH_RC4_128_MD5:
 582                 cipher = "ADH-RC4-MD5";
 583                 break;
 584         case TLS_DH_anon_WITH_DES_CBC_SHA:
 585                 cipher = "ADH-DES-SHA";
 586                 break;
 587         case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
 588                 cipher = "ADH-DES-CBC3-SHA";
 589                 break;
 590         case TLS_RSA_WITH_AES_128_CBC_SHA:
 591                 cipher = "AES-128-SHA";
 592                 break;
 593         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
 594                 cipher = "DHE-RSA-AES-128-SHA";
 595                 break;
 596         case TLS_DH_anon_WITH_AES_128_CBC_SHA:
 597                 cipher = "ADH-AES-128-SHA";
 598                 break;
 599         case TLS_RSA_WITH_AES_256_CBC_SHA:
 600                 cipher = "AES-256-SHA";
 601                 break;
 602         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
 603                 cipher = "DHE-RSA-AES-256-SHA";
 604                 break;
 605         case TLS_DH_anon_WITH_AES_256_CBC_SHA:
 606                 cipher = "ADH-AES-256-SHA";
 607                 break;
 608         case TLS_RSA_WITH_AES_128_CBC_SHA256:
 609                 cipher = "AES-128-SHA256";
 610                 break;
 611         case TLS_RSA_WITH_AES_256_CBC_SHA256:
 612                 cipher = "AES-256-SHA256";
 613                 break;
 614         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
 615                 cipher = "DHE-RSA-AES-128-SHA256";
 616                 break;
 617         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
 618                 cipher = "DHE-RSA-AES-256-SHA256";
 619                 break;
 620         case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
 621                 cipher = "ADH-AES-128-SHA256";
 622                 break;
 623         case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
 624                 cipher = "ADH-AES-256-SHA256";
 625                 break;
 626         default:
 627                 return -1;
 628         }
 629
 630         if (os_strlcpy(buf, cipher, buflen) >= buflen)
 631                 return -1;
 632         return 0;
 633 }
 634
 635
 636 /**
 637  * tlsv1_client_shutdown - Shutdown TLS connection
 638  * @conn: TLSv1 client connection data from tlsv1_client_init()
 639  * Returns: 0 on success, -1 on failure
 640  */
 641 int tlsv1_client_shutdown(struct tlsv1_client *conn)
 642 {
 643         conn->state = CLIENT_HELLO;
 644
 645         if (tls_verify_hash_init(&conn->verify) < 0) {
 646                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
 647                            "hash");
 648                 return -1;
 649         }
 650
 651         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 652         tlsv1_record_change_write_cipher(&conn->rl);
 653         tlsv1_record_change_read_cipher(&conn->rl);
 654
 655         conn->certificate_requested = 0;
 656         crypto_public_key_free(conn->server_rsa_key);
 657         conn->server_rsa_key = NULL;
 658         conn->session_resumed = 0;
 659
 660         return 0;
 661 }
 662
 663
 664 /**
 665  * tlsv1_client_resumed - Was session resumption used
 666  * @conn: TLSv1 client connection data from tlsv1_client_init()
 667  * Returns: 1 if current session used session resumption, 0 if not
 668  */
 669 int tlsv1_client_resumed(struct tlsv1_client *conn)
 670 {
 671         return !!conn->session_resumed;
 672 }
 673
 674
 675 /**
 676  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 677  * @conn: TLSv1 client connection data from tlsv1_client_init()
 678  * @ext_type: Extension type
 679  * @data: Extension payload (%NULL to remove extension)
 680  * @data_len: Extension payload length
 681  * Returns: 0 on success, -1 on failure
 682  */
 683 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
 684                            const u8 *data, size_t data_len)
 685 {
 686         u8 *pos;
 687
 688         conn->session_ticket_included = 0;
 689         os_free(conn->client_hello_ext);
 690         conn->client_hello_ext = NULL;
 691         conn->client_hello_ext_len = 0;
 692
 693         if (data == NULL || data_len == 0)
 694                 return 0;
 695
 696         pos = conn->client_hello_ext = os_malloc(4 + data_len);
 697         if (pos == NULL)
 698                 return -1;
 699
 700         WPA_PUT_BE16(pos, ext_type);
 701         pos += 2;
 702         WPA_PUT_BE16(pos, data_len);
 703         pos += 2;
 704         os_memcpy(pos, data, data_len);
 705         conn->client_hello_ext_len = 4 + data_len;
 706
 707         if (ext_type == TLS_EXT_PAC_OPAQUE) {
 708                 conn->session_ticket_included = 1;
 709                 wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
 710         }
 711
 712         return 0;
 713 }
 714
 715
 716 /**
 717  * tlsv1_client_get_random - Get random data from TLS connection
 718  * @conn: TLSv1 client connection data from tlsv1_client_init()
 719  * @keys: Structure of random data (filled on success)
 720  * Returns: 0 on success, -1 on failure
 721  */
 722 int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
 723 {
 724         os_memset(keys, 0, sizeof(*keys));
 725         if (conn->state == CLIENT_HELLO)
 726                 return -1;
 727
 728         keys->client_random = conn->client_random;
 729         keys->client_random_len = TLS_RANDOM_LEN;
 730
 731         if (conn->state != SERVER_HELLO) {
 732                 keys->server_random = conn->server_random;
 733                 keys->server_random_len = TLS_RANDOM_LEN;
 734         }
 735
 736         return 0;
 737 }
 738
 739
 740 /**
 741  * tlsv1_client_get_keyblock_size - Get TLS key_block size
 742  * @conn: TLSv1 client connection data from tlsv1_client_init()
 743  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 744  * failure
 745  */
 746 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
 747 {
 748         if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
 749                 return -1;
 750
 751         return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
 752                     conn->rl.iv_size);
 753 }
 754
 755
 756 /**
 757  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 758  * @conn: TLSv1 client connection data from tlsv1_client_init()
 759  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 760  * (TLS_CIPHER_*).
 761  * Returns: 0 on success, -1 on failure
 762  */
 763 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
 764 {
 765         size_t count;
 766         u16 *suites;
 767
 768         /* TODO: implement proper configuration of cipher suites */
 769         if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
 770                 count = 0;
 771                 suites = conn->cipher_suites;
 772                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
 773                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
 774                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
 775                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 776                 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
 777                 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
 778                 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
 779
 780                 /*
 781                  * Cisco AP (at least 350 and 1200 series) local authentication
 782                  * server does not know how to search cipher suites from the
 783                  * list and seem to require that the last entry in the list is
 784                  * the one that it wants to use. However, TLS specification
 785                  * requires the list to be in the client preference order. As a
 786                  * workaround, add anon-DH AES-128-SHA1 again at the end of the
 787                  * list to allow the Cisco code to find it.
 788                  */
 789                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 790                 conn->num_cipher_suites = count;
 791         }
 792
 793         return 0;
 794 }
 795
 796
 797 /**
 798  * tlsv1_client_set_cred - Set client credentials
 799  * @conn: TLSv1 client connection data from tlsv1_client_init()
 800  * @cred: Credentials from tlsv1_cred_alloc()
 801  * Returns: 0 on success, -1 on failure
 802  *
 803  * On success, the client takes ownership of the credentials block and caller
 804  * must not free it. On failure, caller is responsible for freeing the
 805  * credential block.
 806  */
 807 int tlsv1_client_set_cred(struct tlsv1_client *conn,
 808                           struct tlsv1_credentials *cred)
 809 {
 810         tlsv1_cred_free(conn->cred);
 811         conn->cred = cred;
 812         return 0;
 813 }
 814
 815
 816 /**
 817  * tlsv1_client_set_flags - Set connection flags
 818  * @conn: TLSv1 client connection data from tlsv1_client_init()
 819  * @flags: TLS_CONN_* bitfield
 820  */
 821 void tlsv1_client_set_flags(struct tlsv1_client *conn, unsigned int flags)
 822 {
 823         conn->flags = flags;
 824 }
 825
 826
 827 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
 828                                         tlsv1_client_session_ticket_cb cb,
 829                                         void *ctx)
 830 {
 831         wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
 832                    cb, ctx);
 833         conn->session_ticket_cb = cb;
 834         conn->session_ticket_cb_ctx = ctx;
 835 }
 836
 837
 838 void tlsv1_client_set_cb(struct tlsv1_client *conn,
 839                          void (*event_cb)(void *ctx, enum tls_event ev,
 840                                           union tls_event_data *data),
 841                          void *cb_ctx,
 842                          int cert_in_cb)
 843 {
 844         conn->event_cb = event_cb;
 845         conn->cb_ctx = cb_ctx;
 846         conn->cert_in_cb = !!cert_in_cb;
 847 }
 848
 849
 850 int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
 851                              size_t buflen)
 852 {
 853         if (!conn)
 854                 return -1;
 855         switch (conn->rl.tls_version) {
 856         case TLS_VERSION_1:
 857                 os_strlcpy(buf, "TLSv1", buflen);
 858                 break;
 859         case TLS_VERSION_1_1:
 860                 os_strlcpy(buf, "TLSv1.1", buflen);
 861                 break;
 862         case TLS_VERSION_1_2:
 863                 os_strlcpy(buf, "TLSv1.2", buflen);
 864                 break;
 865         default:
 866                 return -1;
 867         }
 868
 869         return 0;
 870 }