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00015 #include "includes.h"
00016
00017 #include "common.h"
00018 #include "crypto/md5.h"
00019 #include "crypto/sha1.h"
00020 #include "crypto/tls.h"
00021 #include "x509v3.h"
00022 #include "tlsv1_common.h"
00023 #include "tlsv1_record.h"
00024 #include "tlsv1_server.h"
00025 #include "tlsv1_server_i.h"
00026
00027
00028 static size_t tls_server_cert_chain_der_len(struct tlsv1_server *conn)
00029 {
00030 size_t len = 0;
00031 struct x509_certificate *cert;
00032
00033 cert = conn->cred->cert;
00034 while (cert) {
00035 len += 3 + cert->cert_len;
00036 if (x509_certificate_self_signed(cert))
00037 break;
00038 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
00039 &cert->issuer);
00040 }
00041
00042 return len;
00043 }
00044
00045
00046 static int tls_write_server_hello(struct tlsv1_server *conn,
00047 u8 **msgpos, u8 *end)
00048 {
00049 u8 *pos, *rhdr, *hs_start, *hs_length;
00050 struct os_time now;
00051 size_t rlen;
00052
00053 pos = *msgpos;
00054
00055 wpa_printf(MSG_DEBUG, "TLSv1: Send ServerHello");
00056 rhdr = pos;
00057 pos += TLS_RECORD_HEADER_LEN;
00058
00059 os_get_time(&now);
00060 WPA_PUT_BE32(conn->server_random, now.sec);
00061 if (os_get_random(conn->server_random + 4, TLS_RANDOM_LEN - 4)) {
00062 wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
00063 "server_random");
00064 return -1;
00065 }
00066 wpa_hexdump(MSG_MSGDUMP, "TLSv1: server_random",
00067 conn->server_random, TLS_RANDOM_LEN);
00068
00069 conn->session_id_len = TLS_SESSION_ID_MAX_LEN;
00070 if (os_get_random(conn->session_id, conn->session_id_len)) {
00071 wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
00072 "session_id");
00073 return -1;
00074 }
00075 wpa_hexdump(MSG_MSGDUMP, "TLSv1: session_id",
00076 conn->session_id, conn->session_id_len);
00077
00078
00079
00080
00081 hs_start = pos;
00082
00083 *pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO;
00084
00085 hs_length = pos;
00086 pos += 3;
00087
00088
00089 WPA_PUT_BE16(pos, TLS_VERSION);
00090 pos += 2;
00091
00092 os_memcpy(pos, conn->server_random, TLS_RANDOM_LEN);
00093 pos += TLS_RANDOM_LEN;
00094
00095 *pos++ = conn->session_id_len;
00096 os_memcpy(pos, conn->session_id, conn->session_id_len);
00097 pos += conn->session_id_len;
00098
00099 WPA_PUT_BE16(pos, conn->cipher_suite);
00100 pos += 2;
00101
00102 *pos++ = TLS_COMPRESSION_NULL;
00103
00104 if (conn->session_ticket && conn->session_ticket_cb) {
00105 int res = conn->session_ticket_cb(
00106 conn->session_ticket_cb_ctx,
00107 conn->session_ticket, conn->session_ticket_len,
00108 conn->client_random, conn->server_random,
00109 conn->master_secret);
00110 if (res < 0) {
00111 wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback "
00112 "indicated failure");
00113 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00114 TLS_ALERT_HANDSHAKE_FAILURE);
00115 return -1;
00116 }
00117 conn->use_session_ticket = res;
00118
00119 if (conn->use_session_ticket) {
00120 if (tlsv1_server_derive_keys(conn, NULL, 0) < 0) {
00121 wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
00122 "derive keys");
00123 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00124 TLS_ALERT_INTERNAL_ERROR);
00125 return -1;
00126 }
00127 }
00128
00129
00130
00131
00132
00133
00134
00135
00136
00137
00138
00139 }
00140
00141 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00142 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00143
00144 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00145 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00146 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
00147 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00148 TLS_ALERT_INTERNAL_ERROR);
00149 return -1;
00150 }
00151 pos = rhdr + rlen;
00152
00153 *msgpos = pos;
00154
00155 return 0;
00156 }
00157
00158
00159 static int tls_write_server_certificate(struct tlsv1_server *conn,
00160 u8 **msgpos, u8 *end)
00161 {
00162 u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
00163 size_t rlen;
00164 struct x509_certificate *cert;
00165 const struct tls_cipher_suite *suite;
00166
00167 suite = tls_get_cipher_suite(conn->rl.cipher_suite);
00168 if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) {
00169 wpa_printf(MSG_DEBUG, "TLSv1: Do not send Certificate when "
00170 "using anonymous DH");
00171 return 0;
00172 }
00173
00174 pos = *msgpos;
00175
00176 wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate");
00177 rhdr = pos;
00178 pos += TLS_RECORD_HEADER_LEN;
00179
00180
00181
00182
00183 hs_start = pos;
00184
00185 *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE;
00186
00187 hs_length = pos;
00188 pos += 3;
00189
00190
00191 cert_start = pos;
00192 pos += 3;
00193 cert = conn->cred->cert;
00194 while (cert) {
00195 if (pos + 3 + cert->cert_len > end) {
00196 wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space "
00197 "for Certificate (cert_len=%lu left=%lu)",
00198 (unsigned long) cert->cert_len,
00199 (unsigned long) (end - pos));
00200 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00201 TLS_ALERT_INTERNAL_ERROR);
00202 return -1;
00203 }
00204 WPA_PUT_BE24(pos, cert->cert_len);
00205 pos += 3;
00206 os_memcpy(pos, cert->cert_start, cert->cert_len);
00207 pos += cert->cert_len;
00208
00209 if (x509_certificate_self_signed(cert))
00210 break;
00211 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
00212 &cert->issuer);
00213 }
00214 if (cert == conn->cred->cert || cert == NULL) {
00215
00216
00217
00218
00219
00220
00221 wpa_printf(MSG_DEBUG, "TLSv1: Full server certificate chain "
00222 "not configured - validation may fail");
00223 }
00224 WPA_PUT_BE24(cert_start, pos - cert_start - 3);
00225
00226 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00227
00228 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00229 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00230 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
00231 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00232 TLS_ALERT_INTERNAL_ERROR);
00233 return -1;
00234 }
00235 pos = rhdr + rlen;
00236
00237 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00238
00239 *msgpos = pos;
00240
00241 return 0;
00242 }
00243
00244
00245 static int tls_write_server_key_exchange(struct tlsv1_server *conn,
00246 u8 **msgpos, u8 *end)
00247 {
00248 tls_key_exchange keyx;
00249 const struct tls_cipher_suite *suite;
00250 u8 *pos, *rhdr, *hs_start, *hs_length;
00251 size_t rlen;
00252 u8 *dh_ys;
00253 size_t dh_ys_len;
00254
00255 suite = tls_get_cipher_suite(conn->rl.cipher_suite);
00256 if (suite == NULL)
00257 keyx = TLS_KEY_X_NULL;
00258 else
00259 keyx = suite->key_exchange;
00260
00261 if (!tls_server_key_exchange_allowed(conn->rl.cipher_suite)) {
00262 wpa_printf(MSG_DEBUG, "TLSv1: No ServerKeyExchange needed");
00263 return 0;
00264 }
00265
00266 if (keyx != TLS_KEY_X_DH_anon) {
00267
00268 wpa_printf(MSG_DEBUG, "TLSv1: ServerKeyExchange not yet "
00269 "supported with key exchange type %d", keyx);
00270 return -1;
00271 }
00272
00273 if (conn->cred == NULL || conn->cred->dh_p == NULL ||
00274 conn->cred->dh_g == NULL) {
00275 wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available for "
00276 "ServerKeyExhcange");
00277 return -1;
00278 }
00279
00280 os_free(conn->dh_secret);
00281 conn->dh_secret_len = conn->cred->dh_p_len;
00282 conn->dh_secret = os_malloc(conn->dh_secret_len);
00283 if (conn->dh_secret == NULL) {
00284 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
00285 "memory for secret (Diffie-Hellman)");
00286 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00287 TLS_ALERT_INTERNAL_ERROR);
00288 return -1;
00289 }
00290 if (os_get_random(conn->dh_secret, conn->dh_secret_len)) {
00291 wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
00292 "data for Diffie-Hellman");
00293 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00294 TLS_ALERT_INTERNAL_ERROR);
00295 os_free(conn->dh_secret);
00296 conn->dh_secret = NULL;
00297 return -1;
00298 }
00299
00300 if (os_memcmp(conn->dh_secret, conn->cred->dh_p, conn->dh_secret_len) >
00301 0)
00302 conn->dh_secret[0] = 0;
00303
00304 pos = conn->dh_secret;
00305 while (pos + 1 < conn->dh_secret + conn->dh_secret_len && *pos == 0)
00306 pos++;
00307 if (pos != conn->dh_secret) {
00308 os_memmove(conn->dh_secret, pos,
00309 conn->dh_secret_len - (pos - conn->dh_secret));
00310 conn->dh_secret_len -= pos - conn->dh_secret;
00311 }
00312 wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH server's secret value",
00313 conn->dh_secret, conn->dh_secret_len);
00314
00315
00316 dh_ys_len = conn->cred->dh_p_len;
00317 dh_ys = os_malloc(dh_ys_len);
00318 if (dh_ys == NULL) {
00319 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate memory for "
00320 "Diffie-Hellman");
00321 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00322 TLS_ALERT_INTERNAL_ERROR);
00323 return -1;
00324 }
00325 if (crypto_mod_exp(conn->cred->dh_g, conn->cred->dh_g_len,
00326 conn->dh_secret, conn->dh_secret_len,
00327 conn->cred->dh_p, conn->cred->dh_p_len,
00328 dh_ys, &dh_ys_len)) {
00329 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00330 TLS_ALERT_INTERNAL_ERROR);
00331 os_free(dh_ys);
00332 return -1;
00333 }
00334
00335 wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)",
00336 dh_ys, dh_ys_len);
00337
00338
00339
00340
00341
00342
00343
00344
00345
00346
00347
00348
00349
00350
00351
00352
00353
00354
00355
00356
00357 pos = *msgpos;
00358
00359 wpa_printf(MSG_DEBUG, "TLSv1: Send ServerKeyExchange");
00360 rhdr = pos;
00361 pos += TLS_RECORD_HEADER_LEN;
00362
00363
00364
00365
00366 hs_start = pos;
00367
00368 *pos++ = TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE;
00369
00370 hs_length = pos;
00371 pos += 3;
00372
00373
00374
00375 if (pos + 2 + conn->cred->dh_p_len > end) {
00376 wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
00377 "dh_p");
00378 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00379 TLS_ALERT_INTERNAL_ERROR);
00380 os_free(dh_ys);
00381 return -1;
00382 }
00383 WPA_PUT_BE16(pos, conn->cred->dh_p_len);
00384 pos += 2;
00385 os_memcpy(pos, conn->cred->dh_p, conn->cred->dh_p_len);
00386 pos += conn->cred->dh_p_len;
00387
00388
00389 if (pos + 2 + conn->cred->dh_g_len > end) {
00390 wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
00391 "dh_g");
00392 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00393 TLS_ALERT_INTERNAL_ERROR);
00394 os_free(dh_ys);
00395 return -1;
00396 }
00397 WPA_PUT_BE16(pos, conn->cred->dh_g_len);
00398 pos += 2;
00399 os_memcpy(pos, conn->cred->dh_g, conn->cred->dh_g_len);
00400 pos += conn->cred->dh_g_len;
00401
00402
00403 if (pos + 2 + dh_ys_len > end) {
00404 wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
00405 "dh_Ys");
00406 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00407 TLS_ALERT_INTERNAL_ERROR);
00408 os_free(dh_ys);
00409 return -1;
00410 }
00411 WPA_PUT_BE16(pos, dh_ys_len);
00412 pos += 2;
00413 os_memcpy(pos, dh_ys, dh_ys_len);
00414 pos += dh_ys_len;
00415 os_free(dh_ys);
00416
00417 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00418
00419 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00420 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00421 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
00422 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00423 TLS_ALERT_INTERNAL_ERROR);
00424 return -1;
00425 }
00426 pos = rhdr + rlen;
00427
00428 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00429
00430 *msgpos = pos;
00431
00432 return 0;
00433 }
00434
00435
00436 static int tls_write_server_certificate_request(struct tlsv1_server *conn,
00437 u8 **msgpos, u8 *end)
00438 {
00439 u8 *pos, *rhdr, *hs_start, *hs_length;
00440 size_t rlen;
00441
00442 if (!conn->verify_peer) {
00443 wpa_printf(MSG_DEBUG, "TLSv1: No CertificateRequest needed");
00444 return 0;
00445 }
00446
00447 pos = *msgpos;
00448
00449 wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateRequest");
00450 rhdr = pos;
00451 pos += TLS_RECORD_HEADER_LEN;
00452
00453
00454
00455
00456 hs_start = pos;
00457
00458 *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST;
00459
00460 hs_length = pos;
00461 pos += 3;
00462
00463
00464
00465
00466
00467
00468
00469
00470
00471 *pos++ = 1;
00472 *pos++ = 1;
00473
00474
00475
00476
00477
00478
00479 WPA_PUT_BE16(pos, 0);
00480 pos += 2;
00481
00482 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00483
00484 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00485 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00486 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
00487 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00488 TLS_ALERT_INTERNAL_ERROR);
00489 return -1;
00490 }
00491 pos = rhdr + rlen;
00492
00493 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00494
00495 *msgpos = pos;
00496
00497 return 0;
00498 }
00499
00500
00501 static int tls_write_server_hello_done(struct tlsv1_server *conn,
00502 u8 **msgpos, u8 *end)
00503 {
00504 u8 *pos, *rhdr, *hs_start, *hs_length;
00505 size_t rlen;
00506
00507 pos = *msgpos;
00508
00509 wpa_printf(MSG_DEBUG, "TLSv1: Send ServerHelloDone");
00510 rhdr = pos;
00511 pos += TLS_RECORD_HEADER_LEN;
00512
00513
00514
00515
00516 hs_start = pos;
00517
00518 *pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE;
00519
00520 hs_length = pos;
00521 pos += 3;
00522
00523
00524 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00525
00526 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00527 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00528 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
00529 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00530 TLS_ALERT_INTERNAL_ERROR);
00531 return -1;
00532 }
00533 pos = rhdr + rlen;
00534
00535 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00536
00537 *msgpos = pos;
00538
00539 return 0;
00540 }
00541
00542
00543 static int tls_write_server_change_cipher_spec(struct tlsv1_server *conn,
00544 u8 **msgpos, u8 *end)
00545 {
00546 u8 *pos, *rhdr;
00547 size_t rlen;
00548
00549 pos = *msgpos;
00550
00551 wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec");
00552 rhdr = pos;
00553 pos += TLS_RECORD_HEADER_LEN;
00554 *pos = TLS_CHANGE_CIPHER_SPEC;
00555 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
00556 rhdr, end - rhdr, 1, &rlen) < 0) {
00557 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
00558 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00559 TLS_ALERT_INTERNAL_ERROR);
00560 return -1;
00561 }
00562
00563 if (tlsv1_record_change_write_cipher(&conn->rl) < 0) {
00564 wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for "
00565 "record layer");
00566 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00567 TLS_ALERT_INTERNAL_ERROR);
00568 return -1;
00569 }
00570
00571 *msgpos = rhdr + rlen;
00572
00573 return 0;
00574 }
00575
00576
00577 static int tls_write_server_finished(struct tlsv1_server *conn,
00578 u8 **msgpos, u8 *end)
00579 {
00580 u8 *pos, *rhdr, *hs_start, *hs_length;
00581 size_t rlen, hlen;
00582 u8 verify_data[TLS_VERIFY_DATA_LEN];
00583 u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
00584
00585 pos = *msgpos;
00586
00587 wpa_printf(MSG_DEBUG, "TLSv1: Send Finished");
00588
00589
00590
00591 hlen = MD5_MAC_LEN;
00592 if (conn->verify.md5_server == NULL ||
00593 crypto_hash_finish(conn->verify.md5_server, hash, &hlen) < 0) {
00594 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00595 TLS_ALERT_INTERNAL_ERROR);
00596 conn->verify.md5_server = NULL;
00597 crypto_hash_finish(conn->verify.sha1_server, NULL, NULL);
00598 conn->verify.sha1_server = NULL;
00599 return -1;
00600 }
00601 conn->verify.md5_server = NULL;
00602 hlen = SHA1_MAC_LEN;
00603 if (conn->verify.sha1_server == NULL ||
00604 crypto_hash_finish(conn->verify.sha1_server, hash + MD5_MAC_LEN,
00605 &hlen) < 0) {
00606 conn->verify.sha1_server = NULL;
00607 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00608 TLS_ALERT_INTERNAL_ERROR);
00609 return -1;
00610 }
00611 conn->verify.sha1_server = NULL;
00612
00613 if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
00614 "server finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
00615 verify_data, TLS_VERIFY_DATA_LEN)) {
00616 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
00617 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00618 TLS_ALERT_INTERNAL_ERROR);
00619 return -1;
00620 }
00621 wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (server)",
00622 verify_data, TLS_VERIFY_DATA_LEN);
00623
00624 rhdr = pos;
00625 pos += TLS_RECORD_HEADER_LEN;
00626
00627 hs_start = pos;
00628
00629 *pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
00630
00631 hs_length = pos;
00632 pos += 3;
00633 os_memcpy(pos, verify_data, TLS_VERIFY_DATA_LEN);
00634 pos += TLS_VERIFY_DATA_LEN;
00635 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
00636 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
00637
00638 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
00639 rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
00640 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
00641 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
00642 TLS_ALERT_INTERNAL_ERROR);
00643 return -1;
00644 }
00645
00646 pos = rhdr + rlen;
00647
00648 *msgpos = pos;
00649
00650 return 0;
00651 }
00652
00653
00654 static u8 * tls_send_server_hello(struct tlsv1_server *conn, size_t *out_len)
00655 {
00656 u8 *msg, *end, *pos;
00657 size_t msglen;
00658
00659 *out_len = 0;
00660
00661 msglen = 1000 + tls_server_cert_chain_der_len(conn);
00662
00663 msg = os_malloc(msglen);
00664 if (msg == NULL)
00665 return NULL;
00666
00667 pos = msg;
00668 end = msg + msglen;
00669
00670 if (tls_write_server_hello(conn, &pos, end) < 0) {
00671 os_free(msg);
00672 return NULL;
00673 }
00674
00675 if (conn->use_session_ticket) {
00676
00677 if (tls_write_server_change_cipher_spec(conn, &pos, end) < 0 ||
00678 tls_write_server_finished(conn, &pos, end) < 0) {
00679 os_free(msg);
00680 return NULL;
00681 }
00682
00683 *out_len = pos - msg;
00684
00685 conn->state = CHANGE_CIPHER_SPEC;
00686
00687 return msg;
00688 }
00689
00690
00691 if (tls_write_server_certificate(conn, &pos, end) < 0 ||
00692 tls_write_server_key_exchange(conn, &pos, end) < 0 ||
00693 tls_write_server_certificate_request(conn, &pos, end) < 0 ||
00694 tls_write_server_hello_done(conn, &pos, end) < 0) {
00695 os_free(msg);
00696 return NULL;
00697 }
00698
00699 *out_len = pos - msg;
00700
00701 conn->state = CLIENT_CERTIFICATE;
00702
00703 return msg;
00704 }
00705
00706
00707 static u8 * tls_send_change_cipher_spec(struct tlsv1_server *conn,
00708 size_t *out_len)
00709 {
00710 u8 *msg, *end, *pos;
00711
00712 *out_len = 0;
00713
00714 msg = os_malloc(1000);
00715 if (msg == NULL)
00716 return NULL;
00717
00718 pos = msg;
00719 end = msg + 1000;
00720
00721 if (tls_write_server_change_cipher_spec(conn, &pos, end) < 0 ||
00722 tls_write_server_finished(conn, &pos, end) < 0) {
00723 os_free(msg);
00724 return NULL;
00725 }
00726
00727 *out_len = pos - msg;
00728
00729 wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed successfully");
00730 conn->state = ESTABLISHED;
00731
00732 return msg;
00733 }
00734
00735
00736 u8 * tlsv1_server_handshake_write(struct tlsv1_server *conn, size_t *out_len)
00737 {
00738 switch (conn->state) {
00739 case SERVER_HELLO:
00740 return tls_send_server_hello(conn, out_len);
00741 case SERVER_CHANGE_CIPHER_SPEC:
00742 return tls_send_change_cipher_spec(conn, out_len);
00743 default:
00744 if (conn->state == ESTABLISHED && conn->use_session_ticket) {
00745
00746 return NULL;
00747 }
00748 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while "
00749 "generating reply", conn->state);
00750 return NULL;
00751 }
00752 }
00753
00754
00755 u8 * tlsv1_server_send_alert(struct tlsv1_server *conn, u8 level,
00756 u8 description, size_t *out_len)
00757 {
00758 u8 *alert, *pos, *length;
00759
00760 wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description);
00761 *out_len = 0;
00762
00763 alert = os_malloc(10);
00764 if (alert == NULL)
00765 return NULL;
00766
00767 pos = alert;
00768
00769
00770
00771 *pos++ = TLS_CONTENT_TYPE_ALERT;
00772
00773 WPA_PUT_BE16(pos, TLS_VERSION);
00774 pos += 2;
00775
00776 length = pos;
00777 pos += 2;
00778
00779
00780
00781
00782 *pos++ = level;
00783
00784 *pos++ = description;
00785
00786 WPA_PUT_BE16(length, pos - length - 2);
00787 *out_len = pos - alert;
00788
00789 return alert;
00790 }