libeap/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         } 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         x509_certificate_chain_free(conn->server_cert);
 498         os_free(conn);
 499 }
 500
 501
 502 /**
 503  * tlsv1_client_established - Check whether connection has been established
 504  * @conn: TLSv1 client connection data from tlsv1_client_init()
 505  * Returns: 1 if connection is established, 0 if not
 506  */
 507 int tlsv1_client_established(struct tlsv1_client *conn)
 508 {
 509         return conn->state == ESTABLISHED;
 510 }
 511
 512
 513 /**
 514  * tlsv1_client_prf - Use TLS-PRF to derive keying material
 515  * @conn: TLSv1 client connection data from tlsv1_client_init()
 516  * @label: Label (e.g., description of the key) for PRF
 517  * @server_random_first: seed is 0 = client_random|server_random,
 518  * 1 = server_random|client_random
 519  * @out: Buffer for output data from TLS-PRF
 520  * @out_len: Length of the output buffer
 521  * Returns: 0 on success, -1 on failure
 522  */
 523 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
 524                      int server_random_first, u8 *out, size_t out_len)
 525 {
 526         u8 seed[2 * TLS_RANDOM_LEN];
 527
 528         if (conn->state != ESTABLISHED)
 529                 return -1;
 530
 531         if (server_random_first) {
 532                 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
 533                 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
 534                           TLS_RANDOM_LEN);
 535         } else {
 536                 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
 537                 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
 538                           TLS_RANDOM_LEN);
 539         }
 540
 541         return tls_prf(conn->rl.tls_version,
 542                        conn->master_secret, TLS_MASTER_SECRET_LEN,
 543                        label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
 544 }
 545
 546
 547 /**
 548  * tlsv1_client_get_cipher - Get current cipher name
 549  * @conn: TLSv1 client connection data from tlsv1_client_init()
 550  * @buf: Buffer for the cipher name
 551  * @buflen: buf size
 552  * Returns: 0 on success, -1 on failure
 553  *
 554  * Get the name of the currently used cipher.
 555  */
 556 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
 557                             size_t buflen)
 558 {
 559         char *cipher;
 560
 561         switch (conn->rl.cipher_suite) {
 562         case TLS_RSA_WITH_RC4_128_MD5:
 563                 cipher = "RC4-MD5";
 564                 break;
 565         case TLS_RSA_WITH_RC4_128_SHA:
 566                 cipher = "RC4-SHA";
 567                 break;
 568         case TLS_RSA_WITH_DES_CBC_SHA:
 569                 cipher = "DES-CBC-SHA";
 570                 break;
 571         case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
 572                 cipher = "DES-CBC3-SHA";
 573                 break;
 574         case TLS_DHE_RSA_WITH_DES_CBC_SHA:
 575                 cipher = "DHE-RSA-DES-CBC-SHA";
 576                 break;
 577         case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
 578                 cipher = "DHE-RSA-DES-CBC3-SHA";
 579                 break;
 580         case TLS_DH_anon_WITH_RC4_128_MD5:
 581                 cipher = "ADH-RC4-MD5";
 582                 break;
 583         case TLS_DH_anon_WITH_DES_CBC_SHA:
 584                 cipher = "ADH-DES-SHA";
 585                 break;
 586         case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
 587                 cipher = "ADH-DES-CBC3-SHA";
 588                 break;
 589         case TLS_RSA_WITH_AES_128_CBC_SHA:
 590                 cipher = "AES-128-SHA";
 591                 break;
 592         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
 593                 cipher = "DHE-RSA-AES-128-SHA";
 594                 break;
 595         case TLS_DH_anon_WITH_AES_128_CBC_SHA:
 596                 cipher = "ADH-AES-128-SHA";
 597                 break;
 598         case TLS_RSA_WITH_AES_256_CBC_SHA:
 599                 cipher = "AES-256-SHA";
 600                 break;
 601         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
 602                 cipher = "DHE-RSA-AES-256-SHA";
 603                 break;
 604         case TLS_DH_anon_WITH_AES_256_CBC_SHA:
 605                 cipher = "ADH-AES-256-SHA";
 606                 break;
 607         case TLS_RSA_WITH_AES_128_CBC_SHA256:
 608                 cipher = "AES-128-SHA256";
 609                 break;
 610         case TLS_RSA_WITH_AES_256_CBC_SHA256:
 611                 cipher = "AES-256-SHA256";
 612                 break;
 613         case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
 614                 cipher = "DHE-RSA-AES-128-SHA256";
 615                 break;
 616         case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
 617                 cipher = "DHE-RSA-AES-256-SHA256";
 618                 break;
 619         case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
 620                 cipher = "ADH-AES-128-SHA256";
 621                 break;
 622         case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
 623                 cipher = "ADH-AES-256-SHA256";
 624                 break;
 625         default:
 626                 return -1;
 627         }
 628
 629         if (os_strlcpy(buf, cipher, buflen) >= buflen)
 630                 return -1;
 631         return 0;
 632 }
 633
 634
 635 /**
 636  * tlsv1_client_shutdown - Shutdown TLS connection
 637  * @conn: TLSv1 client connection data from tlsv1_client_init()
 638  * Returns: 0 on success, -1 on failure
 639  */
 640 int tlsv1_client_shutdown(struct tlsv1_client *conn)
 641 {
 642         conn->state = CLIENT_HELLO;
 643
 644         if (tls_verify_hash_init(&conn->verify) < 0) {
 645                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
 646                            "hash");
 647                 return -1;
 648         }
 649
 650         tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
 651         tlsv1_record_change_write_cipher(&conn->rl);
 652         tlsv1_record_change_read_cipher(&conn->rl);
 653
 654         conn->certificate_requested = 0;
 655         crypto_public_key_free(conn->server_rsa_key);
 656         conn->server_rsa_key = NULL;
 657         conn->session_resumed = 0;
 658
 659         return 0;
 660 }
 661
 662
 663 /**
 664  * tlsv1_client_resumed - Was session resumption used
 665  * @conn: TLSv1 client connection data from tlsv1_client_init()
 666  * Returns: 1 if current session used session resumption, 0 if not
 667  */
 668 int tlsv1_client_resumed(struct tlsv1_client *conn)
 669 {
 670         return !!conn->session_resumed;
 671 }
 672
 673
 674 /**
 675  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 676  * @conn: TLSv1 client connection data from tlsv1_client_init()
 677  * @ext_type: Extension type
 678  * @data: Extension payload (%NULL to remove extension)
 679  * @data_len: Extension payload length
 680  * Returns: 0 on success, -1 on failure
 681  */
 682 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
 683                            const u8 *data, size_t data_len)
 684 {
 685         u8 *pos;
 686
 687         conn->session_ticket_included = 0;
 688         os_free(conn->client_hello_ext);
 689         conn->client_hello_ext = NULL;
 690         conn->client_hello_ext_len = 0;
 691
 692         if (data == NULL || data_len == 0)
 693                 return 0;
 694
 695         pos = conn->client_hello_ext = os_malloc(4 + data_len);
 696         if (pos == NULL)
 697                 return -1;
 698
 699         WPA_PUT_BE16(pos, ext_type);
 700         pos += 2;
 701         WPA_PUT_BE16(pos, data_len);
 702         pos += 2;
 703         os_memcpy(pos, data, data_len);
 704         conn->client_hello_ext_len = 4 + data_len;
 705
 706         if (ext_type == TLS_EXT_PAC_OPAQUE) {
 707                 conn->session_ticket_included = 1;
 708                 wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
 709         }
 710
 711         return 0;
 712 }
 713
 714
 715 /**
 716  * tlsv1_client_get_random - Get random data from TLS connection
 717  * @conn: TLSv1 client connection data from tlsv1_client_init()
 718  * @keys: Structure of random data (filled on success)
 719  * Returns: 0 on success, -1 on failure
 720  */
 721 int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
 722 {
 723         os_memset(keys, 0, sizeof(*keys));
 724         if (conn->state == CLIENT_HELLO)
 725                 return -1;
 726
 727         keys->client_random = conn->client_random;
 728         keys->client_random_len = TLS_RANDOM_LEN;
 729
 730         if (conn->state != SERVER_HELLO) {
 731                 keys->server_random = conn->server_random;
 732                 keys->server_random_len = TLS_RANDOM_LEN;
 733         }
 734
 735         return 0;
 736 }
 737
 738
 739 /**
 740  * tlsv1_client_get_keyblock_size - Get TLS key_block size
 741  * @conn: TLSv1 client connection data from tlsv1_client_init()
 742  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 743  * failure
 744  */
 745 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
 746 {
 747         if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
 748                 return -1;
 749
 750         return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
 751                     conn->rl.iv_size);
 752 }
 753
 754
 755 /**
 756  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 757  * @conn: TLSv1 client connection data from tlsv1_client_init()
 758  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 759  * (TLS_CIPHER_*).
 760  * Returns: 0 on success, -1 on failure
 761  */
 762 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
 763 {
 764         size_t count;
 765         u16 *suites;
 766
 767         /* TODO: implement proper configuration of cipher suites */
 768         if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
 769                 count = 0;
 770                 suites = conn->cipher_suites;
 771                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
 772                 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
 773                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
 774                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 775                 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
 776                 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
 777                 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
 778
 779                 /*
 780                  * Cisco AP (at least 350 and 1200 series) local authentication
 781                  * server does not know how to search cipher suites from the
 782                  * list and seem to require that the last entry in the list is
 783                  * the one that it wants to use. However, TLS specification
 784                  * requires the list to be in the client preference order. As a
 785                  * workaround, add anon-DH AES-128-SHA1 again at the end of the
 786                  * list to allow the Cisco code to find it.
 787                  */
 788                 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
 789                 conn->num_cipher_suites = count;
 790         }
 791
 792         return 0;
 793 }
 794
 795
 796 /**
 797  * tlsv1_client_set_cred - Set client credentials
 798  * @conn: TLSv1 client connection data from tlsv1_client_init()
 799  * @cred: Credentials from tlsv1_cred_alloc()
 800  * Returns: 0 on success, -1 on failure
 801  *
 802  * On success, the client takes ownership of the credentials block and caller
 803  * must not free it. On failure, caller is responsible for freeing the
 804  * credential block.
 805  */
 806 int tlsv1_client_set_cred(struct tlsv1_client *conn,
 807                           struct tlsv1_credentials *cred)
 808 {
 809         tlsv1_cred_free(conn->cred);
 810         conn->cred = cred;
 811         return 0;
 812 }
 813
 814
 815 /**
 816  * tlsv1_client_set_flags - Set connection flags
 817  * @conn: TLSv1 client connection data from tlsv1_client_init()
 818  * @flags: TLS_CONN_* bitfield
 819  */
 820 void tlsv1_client_set_flags(struct tlsv1_client *conn, unsigned int flags)
 821 {
 822         conn->flags = flags;
 823 }
 824
 825
 826 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
 827                                         tlsv1_client_session_ticket_cb cb,
 828                                         void *ctx)
 829 {
 830         wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
 831                    cb, ctx);
 832         conn->session_ticket_cb = cb;
 833         conn->session_ticket_cb_ctx = ctx;
 834 }
 835
 836
 837 void tlsv1_client_set_cb(struct tlsv1_client *conn,
 838                          void (*event_cb)(void *ctx, enum tls_event ev,
 839                                           union tls_event_data *data),
 840                          void *cb_ctx,
 841                          int cert_in_cb)
 842 {
 843         conn->event_cb = event_cb;
 844         conn->cb_ctx = cb_ctx;
 845         conn->cert_in_cb = !!cert_in_cb;
 846 }
 847
 848
 849 int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
 850                              size_t buflen)
 851 {
 852         if (!conn)
 853                 return -1;
 854         switch (conn->rl.tls_version) {
 855         case TLS_VERSION_1:
 856                 os_strlcpy(buf, "TLSv1", buflen);
 857                 break;
 858         case TLS_VERSION_1_1:
 859                 os_strlcpy(buf, "TLSv1.1", buflen);
 860                 break;
 861         case TLS_VERSION_1_2:
 862                 os_strlcpy(buf, "TLSv1.2", buflen);
 863                 break;
 864         default:
 865                 return -1;
 866         }
 867
 868         return 0;
 869 }