src/tls/tlsv1_client_write.c

   1 /*
   2  * TLSv1 client - write handshake message
   3  * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/md5.h"
  19 #include "crypto/sha1.h"
  20 #include "crypto/tls.h"
  21 #include "x509v3.h"
  22 #include "tlsv1_common.h"
  23 #include "tlsv1_record.h"
  24 #include "tlsv1_client.h"
  25 #include "tlsv1_client_i.h"
  26
  27
  28 static size_t tls_client_cert_chain_der_len(struct tlsv1_client *conn)
  29 {
  30         size_t len = 0;
  31         struct x509_certificate *cert;
  32
  33         if (conn->cred == NULL)
  34                 return 0;
  35
  36         cert = conn->cred->cert;
  37         while (cert) {
  38                 len += 3 + cert->cert_len;
  39                 if (x509_certificate_self_signed(cert))
  40                         break;
  41                 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
  42                                                     &cert->issuer);
  43         }
  44
  45         return len;
  46 }
  47
  48
  49 u8 * tls_send_client_hello(struct tlsv1_client *conn, size_t *out_len)
  50 {
  51         u8 *hello, *end, *pos, *hs_length, *hs_start, *rhdr;
  52         struct os_time now;
  53         size_t len, i;
  54
  55         wpa_printf(MSG_DEBUG, "TLSv1: Send ClientHello");
  56         *out_len = 0;
  57
  58         os_get_time(&now);
  59         WPA_PUT_BE32(conn->client_random, now.sec);
  60         if (os_get_random(conn->client_random + 4, TLS_RANDOM_LEN - 4)) {
  61                 wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
  62                            "client_random");
  63                 return NULL;
  64         }
  65         wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
  66                     conn->client_random, TLS_RANDOM_LEN);
  67
  68         len = 100 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len;
  69         hello = os_malloc(len);
  70         if (hello == NULL)
  71                 return NULL;
  72         end = hello + len;
  73
  74         rhdr = hello;
  75         pos = rhdr + TLS_RECORD_HEADER_LEN;
  76
  77         /* opaque fragment[TLSPlaintext.length] */
  78
  79         /* Handshake */
  80         hs_start = pos;
  81         /* HandshakeType msg_type */
  82         *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_HELLO;
  83         /* uint24 length (to be filled) */
  84         hs_length = pos;
  85         pos += 3;
  86         /* body - ClientHello */
  87         /* ProtocolVersion client_version */
  88         WPA_PUT_BE16(pos, TLS_VERSION);
  89         pos += 2;
  90         /* Random random: uint32 gmt_unix_time, opaque random_bytes */
  91         os_memcpy(pos, conn->client_random, TLS_RANDOM_LEN);
  92         pos += TLS_RANDOM_LEN;
  93         /* SessionID session_id */
  94         *pos++ = conn->session_id_len;
  95         os_memcpy(pos, conn->session_id, conn->session_id_len);
  96         pos += conn->session_id_len;
  97         /* CipherSuite cipher_suites<2..2^16-1> */
  98         WPA_PUT_BE16(pos, 2 * conn->num_cipher_suites);
  99         pos += 2;
 100         for (i = 0; i < conn->num_cipher_suites; i++) {
 101                 WPA_PUT_BE16(pos, conn->cipher_suites[i]);
 102                 pos += 2;
 103         }
 104         /* CompressionMethod compression_methods<1..2^8-1> */
 105         *pos++ = 1;
 106         *pos++ = TLS_COMPRESSION_NULL;
 107
 108         if (conn->client_hello_ext) {
 109                 os_memcpy(pos, conn->client_hello_ext,
 110                           conn->client_hello_ext_len);
 111                 pos += conn->client_hello_ext_len;
 112         }
 113
 114         WPA_PUT_BE24(hs_length, pos - hs_length - 3);
 115         tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
 116
 117         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
 118                               rhdr, end - rhdr, pos - hs_start, out_len) < 0) {
 119                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
 120                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 121                           TLS_ALERT_INTERNAL_ERROR);
 122                 os_free(hello);
 123                 return NULL;
 124         }
 125
 126         conn->state = SERVER_HELLO;
 127
 128         return hello;
 129 }
 130
 131
 132 static int tls_write_client_certificate(struct tlsv1_client *conn,
 133                                         u8 **msgpos, u8 *end)
 134 {
 135         u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
 136         size_t rlen;
 137         struct x509_certificate *cert;
 138
 139         pos = *msgpos;
 140
 141         wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate");
 142         rhdr = pos;
 143         pos += TLS_RECORD_HEADER_LEN;
 144
 145         /* opaque fragment[TLSPlaintext.length] */
 146
 147         /* Handshake */
 148         hs_start = pos;
 149         /* HandshakeType msg_type */
 150         *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE;
 151         /* uint24 length (to be filled) */
 152         hs_length = pos;
 153         pos += 3;
 154         /* body - Certificate */
 155         /* uint24 length (to be filled) */
 156         cert_start = pos;
 157         pos += 3;
 158         cert = conn->cred ? conn->cred->cert : NULL;
 159         while (cert) {
 160                 if (pos + 3 + cert->cert_len > end) {
 161                         wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space "
 162                                    "for Certificate (cert_len=%lu left=%lu)",
 163                                    (unsigned long) cert->cert_len,
 164                                    (unsigned long) (end - pos));
 165                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 166                                   TLS_ALERT_INTERNAL_ERROR);
 167                         return -1;
 168                 }
 169                 WPA_PUT_BE24(pos, cert->cert_len);
 170                 pos += 3;
 171                 os_memcpy(pos, cert->cert_start, cert->cert_len);
 172                 pos += cert->cert_len;
 173
 174                 if (x509_certificate_self_signed(cert))
 175                         break;
 176                 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
 177                                                     &cert->issuer);
 178         }
 179         if (conn->cred == NULL || cert == conn->cred->cert || cert == NULL) {
 180                 /*
 181                  * Client was not configured with all the needed certificates
 182                  * to form a full certificate chain. The server may fail to
 183                  * validate the chain unless it is configured with all the
 184                  * missing CA certificates.
 185                  */
 186                 wpa_printf(MSG_DEBUG, "TLSv1: Full client certificate chain "
 187                            "not configured - validation may fail");
 188         }
 189         WPA_PUT_BE24(cert_start, pos - cert_start - 3);
 190
 191         WPA_PUT_BE24(hs_length, pos - hs_length - 3);
 192
 193         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
 194                               rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
 195                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
 196                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 197                           TLS_ALERT_INTERNAL_ERROR);
 198                 return -1;
 199         }
 200         pos = rhdr + rlen;
 201
 202         tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
 203
 204         *msgpos = pos;
 205
 206         return 0;
 207 }
 208
 209
 210 static int tlsv1_key_x_anon_dh(struct tlsv1_client *conn, u8 **pos, u8 *end)
 211 {
 212         /* ClientDiffieHellmanPublic */
 213         u8 *csecret, *csecret_start, *dh_yc, *shared;
 214         size_t csecret_len, dh_yc_len, shared_len;
 215
 216         csecret_len = conn->dh_p_len;
 217         csecret = os_malloc(csecret_len);
 218         if (csecret == NULL) {
 219                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 220                            "memory for Yc (Diffie-Hellman)");
 221                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 222                           TLS_ALERT_INTERNAL_ERROR);
 223                 return -1;
 224         }
 225         if (os_get_random(csecret, csecret_len)) {
 226                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
 227                            "data for Diffie-Hellman");
 228                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 229                           TLS_ALERT_INTERNAL_ERROR);
 230                 os_free(csecret);
 231                 return -1;
 232         }
 233
 234         if (os_memcmp(csecret, conn->dh_p, csecret_len) > 0)
 235                 csecret[0] = 0; /* make sure Yc < p */
 236
 237         csecret_start = csecret;
 238         while (csecret_len > 1 && *csecret_start == 0) {
 239                 csecret_start++;
 240                 csecret_len--;
 241         }
 242         wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH client's secret value",
 243                         csecret_start, csecret_len);
 244
 245         /* Yc = g^csecret mod p */
 246         dh_yc_len = conn->dh_p_len;
 247         dh_yc = os_malloc(dh_yc_len);
 248         if (dh_yc == NULL) {
 249                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
 250                            "memory for Diffie-Hellman");
 251                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 252                           TLS_ALERT_INTERNAL_ERROR);
 253                 os_free(csecret);
 254                 return -1;
 255         }
 256         if (crypto_mod_exp(conn->dh_g, conn->dh_g_len,
 257                            csecret_start, csecret_len,
 258                            conn->dh_p, conn->dh_p_len,
 259                            dh_yc, &dh_yc_len)) {
 260                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 261                           TLS_ALERT_INTERNAL_ERROR);
 262                 os_free(csecret);
 263                 os_free(dh_yc);
 264                 return -1;
 265         }
 266
 267         wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)",
 268                     dh_yc, dh_yc_len);
 269
 270         WPA_PUT_BE16(*pos, dh_yc_len);
 271         *pos += 2;
 272         if (*pos + dh_yc_len > end) {
 273                 wpa_printf(MSG_DEBUG, "TLSv1: Not enough room in the "
 274                            "message buffer for Yc");
 275                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 276                           TLS_ALERT_INTERNAL_ERROR);
 277                 os_free(csecret);
 278                 os_free(dh_yc);
 279                 return -1;
 280         }
 281         os_memcpy(*pos, dh_yc, dh_yc_len);
 282         *pos += dh_yc_len;
 283         os_free(dh_yc);
 284
 285         shared_len = conn->dh_p_len;
 286         shared = os_malloc(shared_len);
 287         if (shared == NULL) {
 288                 wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for "
 289                            "DH");
 290                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 291                           TLS_ALERT_INTERNAL_ERROR);
 292                 os_free(csecret);
 293                 return -1;
 294         }
 295
 296         /* shared = Ys^csecret mod p */
 297         if (crypto_mod_exp(conn->dh_ys, conn->dh_ys_len,
 298                            csecret_start, csecret_len,
 299                            conn->dh_p, conn->dh_p_len,
 300                            shared, &shared_len)) {
 301                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 302                           TLS_ALERT_INTERNAL_ERROR);
 303                 os_free(csecret);
 304                 os_free(shared);
 305                 return -1;
 306         }
 307         wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange",
 308                         shared, shared_len);
 309
 310         os_memset(csecret_start, 0, csecret_len);
 311         os_free(csecret);
 312         if (tls_derive_keys(conn, shared, shared_len)) {
 313                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
 314                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 315                           TLS_ALERT_INTERNAL_ERROR);
 316                 os_free(shared);
 317                 return -1;
 318         }
 319         os_memset(shared, 0, shared_len);
 320         os_free(shared);
 321         tlsv1_client_free_dh(conn);
 322         return 0;
 323 }
 324
 325
 326 static int tlsv1_key_x_rsa(struct tlsv1_client *conn, u8 **pos, u8 *end)
 327 {
 328         u8 pre_master_secret[TLS_PRE_MASTER_SECRET_LEN];
 329         size_t clen;
 330         int res;
 331
 332         if (tls_derive_pre_master_secret(pre_master_secret) < 0 ||
 333             tls_derive_keys(conn, pre_master_secret,
 334                             TLS_PRE_MASTER_SECRET_LEN)) {
 335                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
 336                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 337                           TLS_ALERT_INTERNAL_ERROR);
 338                 return -1;
 339         }
 340
 341         /* EncryptedPreMasterSecret */
 342         if (conn->server_rsa_key == NULL) {
 343                 wpa_printf(MSG_DEBUG, "TLSv1: No server RSA key to "
 344                            "use for encrypting pre-master secret");
 345                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 346                           TLS_ALERT_INTERNAL_ERROR);
 347                 return -1;
 348         }
 349
 350         /* RSA encrypted value is encoded with PKCS #1 v1.5 block type 2. */
 351         *pos += 2;
 352         clen = end - *pos;
 353         res = crypto_public_key_encrypt_pkcs1_v15(
 354                 conn->server_rsa_key,
 355                 pre_master_secret, TLS_PRE_MASTER_SECRET_LEN,
 356                 *pos, &clen);
 357         os_memset(pre_master_secret, 0, TLS_PRE_MASTER_SECRET_LEN);
 358         if (res < 0) {
 359                 wpa_printf(MSG_DEBUG, "TLSv1: RSA encryption failed");
 360                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 361                           TLS_ALERT_INTERNAL_ERROR);
 362                 return -1;
 363         }
 364         WPA_PUT_BE16(*pos - 2, clen);
 365         wpa_hexdump(MSG_MSGDUMP, "TLSv1: Encrypted pre_master_secret",
 366                     *pos, clen);
 367         *pos += clen;
 368
 369         return 0;
 370 }
 371
 372
 373 static int tls_write_client_key_exchange(struct tlsv1_client *conn,
 374                                          u8 **msgpos, u8 *end)
 375 {
 376         u8 *pos, *rhdr, *hs_start, *hs_length;
 377         size_t rlen;
 378         tls_key_exchange keyx;
 379         const struct tls_cipher_suite *suite;
 380
 381         suite = tls_get_cipher_suite(conn->rl.cipher_suite);
 382         if (suite == NULL)
 383                 keyx = TLS_KEY_X_NULL;
 384         else
 385                 keyx = suite->key_exchange;
 386
 387         pos = *msgpos;
 388
 389         wpa_printf(MSG_DEBUG, "TLSv1: Send ClientKeyExchange");
 390
 391         rhdr = pos;
 392         pos += TLS_RECORD_HEADER_LEN;
 393
 394         /* opaque fragment[TLSPlaintext.length] */
 395
 396         /* Handshake */
 397         hs_start = pos;
 398         /* HandshakeType msg_type */
 399         *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE;
 400         /* uint24 length (to be filled) */
 401         hs_length = pos;
 402         pos += 3;
 403         /* body - ClientKeyExchange */
 404         if (keyx == TLS_KEY_X_DH_anon) {
 405                 if (tlsv1_key_x_anon_dh(conn, &pos, end) < 0)
 406                         return -1;
 407         } else {
 408                 if (tlsv1_key_x_rsa(conn, &pos, end) < 0)
 409                         return -1;
 410         }
 411
 412         WPA_PUT_BE24(hs_length, pos - hs_length - 3);
 413
 414         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
 415                               rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
 416                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
 417                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 418                           TLS_ALERT_INTERNAL_ERROR);
 419                 return -1;
 420         }
 421         pos = rhdr + rlen;
 422         tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
 423
 424         *msgpos = pos;
 425
 426         return 0;
 427 }
 428
 429
 430 static int tls_write_client_certificate_verify(struct tlsv1_client *conn,
 431                                                u8 **msgpos, u8 *end)
 432 {
 433         u8 *pos, *rhdr, *hs_start, *hs_length, *signed_start;
 434         size_t rlen, hlen, clen;
 435         u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos;
 436         enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA;
 437
 438         pos = *msgpos;
 439
 440         wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateVerify");
 441         rhdr = pos;
 442         pos += TLS_RECORD_HEADER_LEN;
 443
 444         /* Handshake */
 445         hs_start = pos;
 446         /* HandshakeType msg_type */
 447         *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY;
 448         /* uint24 length (to be filled) */
 449         hs_length = pos;
 450         pos += 3;
 451
 452         /*
 453          * RFC 2246: 7.4.3 and 7.4.8:
 454          * Signature signature
 455          *
 456          * RSA:
 457          * digitally-signed struct {
 458          *     opaque md5_hash[16];
 459          *     opaque sha_hash[20];
 460          * };
 461          *
 462          * DSA:
 463          * digitally-signed struct {
 464          *     opaque sha_hash[20];
 465          * };
 466          *
 467          * The hash values are calculated over all handshake messages sent or
 468          * received starting at ClientHello up to, but not including, this
 469          * CertificateVerify message, including the type and length fields of
 470          * the handshake messages.
 471          */
 472
 473         hpos = hash;
 474
 475         if (alg == SIGN_ALG_RSA) {
 476                 hlen = MD5_MAC_LEN;
 477                 if (conn->verify.md5_cert == NULL ||
 478                     crypto_hash_finish(conn->verify.md5_cert, hpos, &hlen) < 0)
 479                 {
 480                         tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 481                                   TLS_ALERT_INTERNAL_ERROR);
 482                         conn->verify.md5_cert = NULL;
 483                         crypto_hash_finish(conn->verify.sha1_cert, NULL, NULL);
 484                         conn->verify.sha1_cert = NULL;
 485                         return -1;
 486                 }
 487                 hpos += MD5_MAC_LEN;
 488         } else
 489                 crypto_hash_finish(conn->verify.md5_cert, NULL, NULL);
 490
 491         conn->verify.md5_cert = NULL;
 492         hlen = SHA1_MAC_LEN;
 493         if (conn->verify.sha1_cert == NULL ||
 494             crypto_hash_finish(conn->verify.sha1_cert, hpos, &hlen) < 0) {
 495                 conn->verify.sha1_cert = NULL;
 496                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 497                           TLS_ALERT_INTERNAL_ERROR);
 498                 return -1;
 499         }
 500         conn->verify.sha1_cert = NULL;
 501
 502         if (alg == SIGN_ALG_RSA)
 503                 hlen += MD5_MAC_LEN;
 504
 505         wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen);
 506
 507         /*
 508          * RFC 2246, 4.7:
 509          * In digital signing, one-way hash functions are used as input for a
 510          * signing algorithm. A digitally-signed element is encoded as an
 511          * opaque vector <0..2^16-1>, where the length is specified by the
 512          * signing algorithm and key.
 513          *
 514          * In RSA signing, a 36-byte structure of two hashes (one SHA and one
 515          * MD5) is signed (encrypted with the private key). It is encoded with
 516          * PKCS #1 block type 0 or type 1 as described in [PKCS1].
 517          */
 518         signed_start = pos; /* length to be filled */
 519         pos += 2;
 520         clen = end - pos;
 521         if (conn->cred == NULL ||
 522             crypto_private_key_sign_pkcs1(conn->cred->key, hash, hlen,
 523                                           pos, &clen) < 0) {
 524                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to sign hash (PKCS #1)");
 525                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 526                           TLS_ALERT_INTERNAL_ERROR);
 527                 return -1;
 528         }
 529         WPA_PUT_BE16(signed_start, clen);
 530
 531         pos += clen;
 532
 533         WPA_PUT_BE24(hs_length, pos - hs_length - 3);
 534
 535         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
 536                               rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
 537                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
 538                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 539                           TLS_ALERT_INTERNAL_ERROR);
 540                 return -1;
 541         }
 542         pos = rhdr + rlen;
 543
 544         tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
 545
 546         *msgpos = pos;
 547
 548         return 0;
 549 }
 550
 551
 552 static int tls_write_client_change_cipher_spec(struct tlsv1_client *conn,
 553                                                u8 **msgpos, u8 *end)
 554 {
 555         u8 *pos, *rhdr;
 556         size_t rlen;
 557
 558         pos = *msgpos;
 559
 560         wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec");
 561         rhdr = pos;
 562         pos += TLS_RECORD_HEADER_LEN;
 563         *pos = TLS_CHANGE_CIPHER_SPEC;
 564         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
 565                               rhdr, end - rhdr, 1, &rlen) < 0) {
 566                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
 567                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 568                           TLS_ALERT_INTERNAL_ERROR);
 569                 return -1;
 570         }
 571
 572         if (tlsv1_record_change_write_cipher(&conn->rl) < 0) {
 573                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for "
 574                            "record layer");
 575                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 576                           TLS_ALERT_INTERNAL_ERROR);
 577                 return -1;
 578         }
 579
 580         *msgpos = rhdr + rlen;
 581
 582         return 0;
 583 }
 584
 585
 586 static int tls_write_client_finished(struct tlsv1_client *conn,
 587                                      u8 **msgpos, u8 *end)
 588 {
 589         u8 *pos, *rhdr, *hs_start, *hs_length;
 590         size_t rlen, hlen;
 591         u8 verify_data[TLS_VERIFY_DATA_LEN];
 592         u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
 593
 594         pos = *msgpos;
 595
 596         wpa_printf(MSG_DEBUG, "TLSv1: Send Finished");
 597
 598         /* Encrypted Handshake Message: Finished */
 599
 600         hlen = MD5_MAC_LEN;
 601         if (conn->verify.md5_client == NULL ||
 602             crypto_hash_finish(conn->verify.md5_client, hash, &hlen) < 0) {
 603                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 604                           TLS_ALERT_INTERNAL_ERROR);
 605                 conn->verify.md5_client = NULL;
 606                 crypto_hash_finish(conn->verify.sha1_client, NULL, NULL);
 607                 conn->verify.sha1_client = NULL;
 608                 return -1;
 609         }
 610         conn->verify.md5_client = NULL;
 611         hlen = SHA1_MAC_LEN;
 612         if (conn->verify.sha1_client == NULL ||
 613             crypto_hash_finish(conn->verify.sha1_client, hash + MD5_MAC_LEN,
 614                                &hlen) < 0) {
 615                 conn->verify.sha1_client = NULL;
 616                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 617                           TLS_ALERT_INTERNAL_ERROR);
 618                 return -1;
 619         }
 620         conn->verify.sha1_client = NULL;
 621
 622         if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
 623                     "client finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
 624                     verify_data, TLS_VERIFY_DATA_LEN)) {
 625                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
 626                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 627                           TLS_ALERT_INTERNAL_ERROR);
 628                 return -1;
 629         }
 630         wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)",
 631                         verify_data, TLS_VERIFY_DATA_LEN);
 632
 633         rhdr = pos;
 634         pos += TLS_RECORD_HEADER_LEN;
 635         /* Handshake */
 636         hs_start = pos;
 637         /* HandshakeType msg_type */
 638         *pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
 639         /* uint24 length (to be filled) */
 640         hs_length = pos;
 641         pos += 3;
 642         os_memcpy(pos, verify_data, TLS_VERIFY_DATA_LEN);
 643         pos += TLS_VERIFY_DATA_LEN;
 644         WPA_PUT_BE24(hs_length, pos - hs_length - 3);
 645         tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
 646
 647         if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
 648                               rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
 649                 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
 650                 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
 651                           TLS_ALERT_INTERNAL_ERROR);
 652                 return -1;
 653         }
 654
 655         pos = rhdr + rlen;
 656
 657         *msgpos = pos;
 658
 659         return 0;
 660 }
 661
 662
 663 static u8 * tls_send_client_key_exchange(struct tlsv1_client *conn,
 664                                          size_t *out_len)
 665 {
 666         u8 *msg, *end, *pos;
 667         size_t msglen;
 668
 669         *out_len = 0;
 670
 671         msglen = 1000;
 672         if (conn->certificate_requested)
 673                 msglen += tls_client_cert_chain_der_len(conn);
 674
 675         msg = os_malloc(msglen);
 676         if (msg == NULL)
 677                 return NULL;
 678
 679         pos = msg;
 680         end = msg + msglen;
 681
 682         if (conn->certificate_requested) {
 683                 if (tls_write_client_certificate(conn, &pos, end) < 0) {
 684                         os_free(msg);
 685                         return NULL;
 686                 }
 687         }
 688
 689         if (tls_write_client_key_exchange(conn, &pos, end) < 0 ||
 690             (conn->certificate_requested && conn->cred && conn->cred->key &&
 691              tls_write_client_certificate_verify(conn, &pos, end) < 0) ||
 692             tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
 693             tls_write_client_finished(conn, &pos, end) < 0) {
 694                 os_free(msg);
 695                 return NULL;
 696         }
 697
 698         *out_len = pos - msg;
 699
 700         conn->state = SERVER_CHANGE_CIPHER_SPEC;
 701
 702         return msg;
 703 }
 704
 705
 706 static u8 * tls_send_change_cipher_spec(struct tlsv1_client *conn,
 707                                         size_t *out_len)
 708 {
 709         u8 *msg, *end, *pos;
 710
 711         *out_len = 0;
 712
 713         msg = os_malloc(1000);
 714         if (msg == NULL)
 715                 return NULL;
 716
 717         pos = msg;
 718         end = msg + 1000;
 719
 720         if (tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
 721             tls_write_client_finished(conn, &pos, end) < 0) {
 722                 os_free(msg);
 723                 return NULL;
 724         }
 725
 726         *out_len = pos - msg;
 727
 728         wpa_printf(MSG_DEBUG, "TLSv1: Session resumption completed "
 729                    "successfully");
 730         conn->state = ESTABLISHED;
 731
 732         return msg;
 733 }
 734
 735
 736 u8 * tlsv1_client_handshake_write(struct tlsv1_client *conn, size_t *out_len,
 737                                   int no_appl_data)
 738 {
 739         switch (conn->state) {
 740         case CLIENT_KEY_EXCHANGE:
 741                 return tls_send_client_key_exchange(conn, out_len);
 742         case CHANGE_CIPHER_SPEC:
 743                 return tls_send_change_cipher_spec(conn, out_len);
 744         case ACK_FINISHED:
 745                 wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed "
 746                            "successfully");
 747                 conn->state = ESTABLISHED;
 748                 *out_len = 0;
 749                 if (no_appl_data) {
 750                         /* Need to return something to get final TLS ACK. */
 751                         return os_malloc(1);
 752                 }
 753                 return NULL;
 754         default:
 755                 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while "
 756                            "generating reply", conn->state);
 757                 return NULL;
 758         }
 759 }
 760
 761
 762 u8 * tlsv1_client_send_alert(struct tlsv1_client *conn, u8 level,
 763                              u8 description, size_t *out_len)
 764 {
 765         u8 *alert, *pos, *length;
 766
 767         wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description);
 768         *out_len = 0;
 769
 770         alert = os_malloc(10);
 771         if (alert == NULL)
 772                 return NULL;
 773
 774         pos = alert;
 775
 776         /* TLSPlaintext */
 777         /* ContentType type */
 778         *pos++ = TLS_CONTENT_TYPE_ALERT;
 779         /* ProtocolVersion version */
 780         WPA_PUT_BE16(pos, TLS_VERSION);
 781         pos += 2;
 782         /* uint16 length (to be filled) */
 783         length = pos;
 784         pos += 2;
 785         /* opaque fragment[TLSPlaintext.length] */
 786
 787         /* Alert */
 788         /* AlertLevel level */
 789         *pos++ = level;
 790         /* AlertDescription description */
 791         *pos++ = description;
 792
 793         WPA_PUT_BE16(length, pos - length - 2);
 794         *out_len = pos - alert;
 795
 796         return alert;
 797 }