src/tls/tlsv1_client.c

   1 /*
   2  * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
   3  * Copyright (c) 2006-2014, 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_DHE_RSA_WITH_AES_256_CBC_SHA256;
 463         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
 464         suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
 465         suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
 466         suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
 467         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
 468         suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
 469         suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
 470         suites[count++] = TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
 471         suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
 472         suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
 473         suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
 474         conn->num_cipher_suites = count;
 475
 476         conn->rl.tls_version = TLS_VERSION;
 477
 478         return conn;
 479 }
 480
 481
 482 /**
 483  * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 484  * @conn: TLSv1 client connection data from tlsv1_client_init()
 485  */
 486 void tlsv1_client_deinit(struct tlsv1_client *conn)
 487 {
 488         crypto_public_key_free(conn->server_rsa_key);
 489         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 490         tlsv1_record_change_write_cipher(&conn->rl);
 491         tlsv1_record_change_read_cipher(&conn->rl);
 492         tls_verify_hash_free(&conn->verify);
 493         os_free(conn->client_hello_ext);
 494         tlsv1_client_free_dh(conn);
 495         tlsv1_cred_free(conn->cred);
 496         wpabuf_free(conn->partial_input);
 497         os_free(conn);
 498 }
 499
 500
 501 /**
 502  * tlsv1_client_established - Check whether connection has been established
 503  * @conn: TLSv1 client connection data from tlsv1_client_init()
 504  * Returns: 1 if connection is established, 0 if not
 505  */
 506 int tlsv1_client_established(struct tlsv1_client *conn)
 507 {
 508         return conn->state == ESTABLISHED;
 509 }
 510
 511
 512 /**
 513  * tlsv1_client_prf - Use TLS-PRF to derive keying material
 514  * @conn: TLSv1 client connection data from tlsv1_client_init()
 515  * @label: Label (e.g., description of the key) for PRF
 516  * @server_random_first: seed is 0 = client_random|server_random,
 517  * 1 = server_random|client_random
 518  * @out: Buffer for output data from TLS-PRF
 519  * @out_len: Length of the output buffer
 520  * Returns: 0 on success, -1 on failure
 521  */
 522 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
 523                      int server_random_first, u8 *out, size_t out_len)
 524 {
 525         u8 seed[2 * TLS_RANDOM_LEN];
 526
 527         if (conn->state != ESTABLISHED)
 528                 return -1;
 529
 530         if (server_random_first) {
 531                 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
 532                 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
 533                           TLS_RANDOM_LEN);
 534         } else {
 535                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
 536                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
 537                           TLS_RANDOM_LEN);
 538         }
 539
 540         return tls_prf(conn->rl.tls_version,
 541                        conn->master_secret, TLS_MASTER_SECRET_LEN,
 542                        label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
 543 }
 544
 545
 546 /**
 547  * tlsv1_client_get_cipher - Get current cipher name
 548  * @conn: TLSv1 client connection data from tlsv1_client_init()
 549  * @buf: Buffer for the cipher name
 550  * @buflen: buf size
 551  * Returns: 0 on success, -1 on failure
 552  *
 553  * Get the name of the currently used cipher.
 554  */
 555 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
 556                             size_t buflen)
 557 {
 558         char *cipher;
 559
 560         switch (conn->rl.cipher_suite) {
 561         case TLS_RSA_WITH_RC4_128_MD5:
 562                 cipher = "RC4-MD5";
 563                 break;
 564         case TLS_RSA_WITH_RC4_128_SHA:
 565                 cipher = "RC4-SHA";
 566                 break;
 567         case TLS_RSA_WITH_DES_CBC_SHA:
 568                 cipher = "DES-CBC-SHA";
 569                 break;
 570         case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
 571                 cipher = "DES-CBC3-SHA";
 572                 break;
 573         case TLS_DHE_RSA_WITH_DES_CBC_SHA:
 574                 cipher = "DHE-RSA-DES-CBC-SHA";
 575                 break;
 576         case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
 577                 cipher = "DHE-RSA-DES-CBC3-SHA";
 578                 break;
 579         case TLS_DH_anon_WITH_RC4_128_MD5:
 580                 cipher = "ADH-RC4-MD5";
 581                 break;
 582         case TLS_DH_anon_WITH_DES_CBC_SHA:
 583                 cipher = "ADH-DES-SHA";
 584                 break;
 585         case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
 586                 cipher = "ADH-DES-CBC3-SHA";
 587                 break;
 588         case TLS_RSA_WITH_AES_128_CBC_SHA:
 589                 cipher = "AES-128-SHA";
 590                 break;
 591         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
 592                 cipher = "DHE-RSA-AES-128-SHA";
 593                 break;
 594         case TLS_DH_anon_WITH_AES_128_CBC_SHA:
 595                 cipher = "ADH-AES-128-SHA";
 596                 break;
 597         case TLS_RSA_WITH_AES_256_CBC_SHA:
 598                 cipher = "AES-256-SHA";
 599                 break;
 600         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
 601                 cipher = "DHE-RSA-AES-256-SHA";
 602                 break;
 603         case TLS_DH_anon_WITH_AES_256_CBC_SHA:
 604                 cipher = "ADH-AES-256-SHA";
 605                 break;
 606         case TLS_RSA_WITH_AES_128_CBC_SHA256:
 607                 cipher = "AES-128-SHA256";
 608                 break;
 609         case TLS_RSA_WITH_AES_256_CBC_SHA256:
 610                 cipher = "AES-256-SHA256";
 611                 break;
 612         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
 613                 cipher = "DHE-RSA-AES-128-SHA256";
 614                 break;
 615         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
 616                 cipher = "DHE-RSA-AES-256-SHA256";
 617                 break;
 618         case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
 619                 cipher = "ADH-AES-128-SHA256";
 620                 break;
 621         case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
 622                 cipher = "ADH-AES-256-SHA256";
 623                 break;
 624         default:
 625                 return -1;
 626         }
 627
 628         if (os_strlcpy(buf, cipher, buflen) >= buflen)
 629                 return -1;
 630         return 0;
 631 }
 632
 633
 634 /**
 635  * tlsv1_client_shutdown - Shutdown TLS connection
 636  * @conn: TLSv1 client connection data from tlsv1_client_init()
 637  * Returns: 0 on success, -1 on failure
 638  */
 639 int tlsv1_client_shutdown(struct tlsv1_client *conn)
 640 {
 641         conn->state = CLIENT_HELLO;
 642
 643         if (tls_verify_hash_init(&conn->verify) < 0) {
 644                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
 645                            "hash");
 646                 return -1;
 647         }
 648
 649         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 650         tlsv1_record_change_write_cipher(&conn->rl);
 651         tlsv1_record_change_read_cipher(&conn->rl);
 652
 653         conn->certificate_requested = 0;
 654         crypto_public_key_free(conn->server_rsa_key);
 655         conn->server_rsa_key = NULL;
 656         conn->session_resumed = 0;
 657
 658         return 0;
 659 }
 660
 661
 662 /**
 663  * tlsv1_client_resumed - Was session resumption used
 664  * @conn: TLSv1 client connection data from tlsv1_client_init()
 665  * Returns: 1 if current session used session resumption, 0 if not
 666  */
 667 int tlsv1_client_resumed(struct tlsv1_client *conn)
 668 {
 669         return !!conn->session_resumed;
 670 }
 671
 672
 673 /**
 674  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 675  * @conn: TLSv1 client connection data from tlsv1_client_init()
 676  * @ext_type: Extension type
 677  * @data: Extension payload (%NULL to remove extension)
 678  * @data_len: Extension payload length
 679  * Returns: 0 on success, -1 on failure
 680  */
 681 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
 682                            const u8 *data, size_t data_len)
 683 {
 684         u8 *pos;
 685
 686         conn->session_ticket_included = 0;
 687         os_free(conn->client_hello_ext);
 688         conn->client_hello_ext = NULL;
 689         conn->client_hello_ext_len = 0;
 690
 691         if (data == NULL || data_len == 0)
 692                 return 0;
 693
 694         pos = conn->client_hello_ext = os_malloc(4 + data_len);
 695         if (pos == NULL)
 696                 return -1;
 697
 698         WPA_PUT_BE16(pos, ext_type);
 699         pos += 2;
 700         WPA_PUT_BE16(pos, data_len);
 701         pos += 2;
 702         os_memcpy(pos, data, data_len);
 703         conn->client_hello_ext_len = 4 + data_len;
 704
 705         if (ext_type == TLS_EXT_PAC_OPAQUE) {
 706                 conn->session_ticket_included = 1;
 707                 wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
 708         }
 709
 710         return 0;
 711 }
 712
 713
 714 /**
 715  * tlsv1_client_get_random - Get random data from TLS connection
 716  * @conn: TLSv1 client connection data from tlsv1_client_init()
 717  * @keys: Structure of random data (filled on success)
 718  * Returns: 0 on success, -1 on failure
 719  */
 720 int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
 721 {
 722         os_memset(keys, 0, sizeof(*keys));
 723         if (conn->state == CLIENT_HELLO)
 724                 return -1;
 725
 726         keys->client_random = conn->client_random;
 727         keys->client_random_len = TLS_RANDOM_LEN;
 728
 729         if (conn->state != SERVER_HELLO) {
 730                 keys->server_random = conn->server_random;
 731                 keys->server_random_len = TLS_RANDOM_LEN;
 732         }
 733
 734         return 0;
 735 }
 736
 737
 738 /**
 739  * tlsv1_client_get_keyblock_size - Get TLS key_block size
 740  * @conn: TLSv1 client connection data from tlsv1_client_init()
 741  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 742  * failure
 743  */
 744 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
 745 {
 746         if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
 747                 return -1;
 748
 749         return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
 750                     conn->rl.iv_size);
 751 }
 752
 753
 754 /**
 755  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 756  * @conn: TLSv1 client connection data from tlsv1_client_init()
 757  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 758  * (TLS_CIPHER_*).
 759  * Returns: 0 on success, -1 on failure
 760  */
 761 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
 762 {
 763         size_t count;
 764         u16 *suites;
 765
 766         /* TODO: implement proper configuration of cipher suites */
 767         if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
 768                 count = 0;
 769                 suites = conn->cipher_suites;
 770                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
 771                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
 772                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
 773                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 774                 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
 775                 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
 776                 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
 777
 778                 /*
 779                  * Cisco AP (at least 350 and 1200 series) local authentication
 780                  * server does not know how to search cipher suites from the
 781                  * list and seem to require that the last entry in the list is
 782                  * the one that it wants to use. However, TLS specification
 783                  * requires the list to be in the client preference order. As a
 784                  * workaround, add anon-DH AES-128-SHA1 again at the end of the
 785                  * list to allow the Cisco code to find it.
 786                  */
 787                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 788                 conn->num_cipher_suites = count;
 789         }
 790
 791         return 0;
 792 }
 793
 794
 795 /**
 796  * tlsv1_client_set_cred - Set client credentials
 797  * @conn: TLSv1 client connection data from tlsv1_client_init()
 798  * @cred: Credentials from tlsv1_cred_alloc()
 799  * Returns: 0 on success, -1 on failure
 800  *
 801  * On success, the client takes ownership of the credentials block and caller
 802  * must not free it. On failure, caller is responsible for freeing the
 803  * credential block.
 804  */
 805 int tlsv1_client_set_cred(struct tlsv1_client *conn,
 806                           struct tlsv1_credentials *cred)
 807 {
 808         tlsv1_cred_free(conn->cred);
 809         conn->cred = cred;
 810         return 0;
 811 }
 812
 813
 814 void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
 815 {
 816         conn->disable_time_checks = !enabled;
 817 }
 818
 819
 820 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
 821                                         tlsv1_client_session_ticket_cb cb,
 822                                         void *ctx)
 823 {
 824         wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
 825                    cb, ctx);
 826         conn->session_ticket_cb = cb;
 827         conn->session_ticket_cb_ctx = ctx;
 828 }
 829
 830
 831 void tlsv1_client_set_cb(struct tlsv1_client *conn,
 832                          void (*event_cb)(void *ctx, enum tls_event ev,
 833                                           union tls_event_data *data),
 834                          void *cb_ctx,
 835                          int cert_in_cb)
 836 {
 837         conn->event_cb = event_cb;
 838         conn->cb_ctx = cb_ctx;
 839         conn->cert_in_cb = !!cert_in_cb;
 840 }
 841
 842
 843 int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
 844                              size_t buflen)
 845 {
 846         if (!conn)
 847                 return -1;
 848         switch (conn->rl.tls_version) {
 849         case TLS_VERSION_1:
 850                 os_strlcpy(buf, "TLSv1", buflen);
 851                 break;
 852         case TLS_VERSION_1_1:
 853                 os_strlcpy(buf, "TLSv1.1", buflen);
 854                 break;
 855         case TLS_VERSION_1_2:
 856                 os_strlcpy(buf, "TLSv1.2", buflen);
 857                 break;
 858         default:
 859                 return -1;
 860         }
 861
 862         return 0;
 863 }