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      1 /*
      2  * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
      3  * Copyright (c) 2006-2011, Jouni Malinen <j (at) 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_RSA_WITH_AES_256_CBC_SHA256;
    463 	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
    464 	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
    465 	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
    466 	suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
    467 	suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
    468 	suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
    469 	conn->num_cipher_suites = count;
    470 
    471 	conn->rl.tls_version = TLS_VERSION;
    472 
    473 	return conn;
    474 }
    475 
    476 
    477 /**
    478  * tlsv1_client_deinit - Deinitialize TLSv1 client connection
    479  * @conn: TLSv1 client connection data from tlsv1_client_init()
    480  */
    481 void tlsv1_client_deinit(struct tlsv1_client *conn)
    482 {
    483 	crypto_public_key_free(conn->server_rsa_key);
    484 	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
    485 	tlsv1_record_change_write_cipher(&conn->rl);
    486 	tlsv1_record_change_read_cipher(&conn->rl);
    487 	tls_verify_hash_free(&conn->verify);
    488 	os_free(conn->client_hello_ext);
    489 	tlsv1_client_free_dh(conn);
    490 	tlsv1_cred_free(conn->cred);
    491 	wpabuf_free(conn->partial_input);
    492 	os_free(conn);
    493 }
    494 
    495 
    496 /**
    497  * tlsv1_client_established - Check whether connection has been established
    498  * @conn: TLSv1 client connection data from tlsv1_client_init()
    499  * Returns: 1 if connection is established, 0 if not
    500  */
    501 int tlsv1_client_established(struct tlsv1_client *conn)
    502 {
    503 	return conn->state == ESTABLISHED;
    504 }
    505 
    506 
    507 /**
    508  * tlsv1_client_prf - Use TLS-PRF to derive keying material
    509  * @conn: TLSv1 client connection data from tlsv1_client_init()
    510  * @label: Label (e.g., description of the key) for PRF
    511  * @server_random_first: seed is 0 = client_random|server_random,
    512  * 1 = server_random|client_random
    513  * @out: Buffer for output data from TLS-PRF
    514  * @out_len: Length of the output buffer
    515  * Returns: 0 on success, -1 on failure
    516  */
    517 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
    518 		     int server_random_first, u8 *out, size_t out_len)
    519 {
    520 	u8 seed[2 * TLS_RANDOM_LEN];
    521 
    522 	if (conn->state != ESTABLISHED)
    523 		return -1;
    524 
    525 	if (server_random_first) {
    526 		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
    527 		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
    528 			  TLS_RANDOM_LEN);
    529 	} else {
    530 		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
    531 		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
    532 			  TLS_RANDOM_LEN);
    533 	}
    534 
    535 	return tls_prf(conn->rl.tls_version,
    536 		       conn->master_secret, TLS_MASTER_SECRET_LEN,
    537 		       label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
    538 }
    539 
    540 
    541 /**
    542  * tlsv1_client_get_cipher - Get current cipher name
    543  * @conn: TLSv1 client connection data from tlsv1_client_init()
    544  * @buf: Buffer for the cipher name
    545  * @buflen: buf size
    546  * Returns: 0 on success, -1 on failure
    547  *
    548  * Get the name of the currently used cipher.
    549  */
    550 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
    551 			    size_t buflen)
    552 {
    553 	char *cipher;
    554 
    555 	switch (conn->rl.cipher_suite) {
    556 	case TLS_RSA_WITH_RC4_128_MD5:
    557 		cipher = "RC4-MD5";
    558 		break;
    559 	case TLS_RSA_WITH_RC4_128_SHA:
    560 		cipher = "RC4-SHA";
    561 		break;
    562 	case TLS_RSA_WITH_DES_CBC_SHA:
    563 		cipher = "DES-CBC-SHA";
    564 		break;
    565 	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
    566 		cipher = "DES-CBC3-SHA";
    567 		break;
    568 	case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
    569 		cipher = "ADH-AES-128-SHA256";
    570 		break;
    571 	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
    572 		cipher = "ADH-AES-128-SHA";
    573 		break;
    574 	case TLS_RSA_WITH_AES_256_CBC_SHA:
    575 		cipher = "AES-256-SHA";
    576 		break;
    577 	case TLS_RSA_WITH_AES_256_CBC_SHA256:
    578 		cipher = "AES-256-SHA256";
    579 		break;
    580 	case TLS_RSA_WITH_AES_128_CBC_SHA:
    581 		cipher = "AES-128-SHA";
    582 		break;
    583 	case TLS_RSA_WITH_AES_128_CBC_SHA256:
    584 		cipher = "AES-128-SHA256";
    585 		break;
    586 	default:
    587 		return -1;
    588 	}
    589 
    590 	if (os_strlcpy(buf, cipher, buflen) >= buflen)
    591 		return -1;
    592 	return 0;
    593 }
    594 
    595 
    596 /**
    597  * tlsv1_client_shutdown - Shutdown TLS connection
    598  * @conn: TLSv1 client connection data from tlsv1_client_init()
    599  * Returns: 0 on success, -1 on failure
    600  */
    601 int tlsv1_client_shutdown(struct tlsv1_client *conn)
    602 {
    603 	conn->state = CLIENT_HELLO;
    604 
    605 	if (tls_verify_hash_init(&conn->verify) < 0) {
    606 		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
    607 			   "hash");
    608 		return -1;
    609 	}
    610 
    611 	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
    612 	tlsv1_record_change_write_cipher(&conn->rl);
    613 	tlsv1_record_change_read_cipher(&conn->rl);
    614 
    615 	conn->certificate_requested = 0;
    616 	crypto_public_key_free(conn->server_rsa_key);
    617 	conn->server_rsa_key = NULL;
    618 	conn->session_resumed = 0;
    619 
    620 	return 0;
    621 }
    622 
    623 
    624 /**
    625  * tlsv1_client_resumed - Was session resumption used
    626  * @conn: TLSv1 client connection data from tlsv1_client_init()
    627  * Returns: 1 if current session used session resumption, 0 if not
    628  */
    629 int tlsv1_client_resumed(struct tlsv1_client *conn)
    630 {
    631 	return !!conn->session_resumed;
    632 }
    633 
    634 
    635 /**
    636  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
    637  * @conn: TLSv1 client connection data from tlsv1_client_init()
    638  * @ext_type: Extension type
    639  * @data: Extension payload (%NULL to remove extension)
    640  * @data_len: Extension payload length
    641  * Returns: 0 on success, -1 on failure
    642  */
    643 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
    644 			   const u8 *data, size_t data_len)
    645 {
    646 	u8 *pos;
    647 
    648 	conn->session_ticket_included = 0;
    649 	os_free(conn->client_hello_ext);
    650 	conn->client_hello_ext = NULL;
    651 	conn->client_hello_ext_len = 0;
    652 
    653 	if (data == NULL || data_len == 0)
    654 		return 0;
    655 
    656 	pos = conn->client_hello_ext = os_malloc(6 + data_len);
    657 	if (pos == NULL)
    658 		return -1;
    659 
    660 	WPA_PUT_BE16(pos, 4 + data_len);
    661 	pos += 2;
    662 	WPA_PUT_BE16(pos, ext_type);
    663 	pos += 2;
    664 	WPA_PUT_BE16(pos, data_len);
    665 	pos += 2;
    666 	os_memcpy(pos, data, data_len);
    667 	conn->client_hello_ext_len = 6 + data_len;
    668 
    669 	if (ext_type == TLS_EXT_PAC_OPAQUE) {
    670 		conn->session_ticket_included = 1;
    671 		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
    672 	}
    673 
    674 	return 0;
    675 }
    676 
    677 
    678 /**
    679  * tlsv1_client_get_keys - Get master key and random data from TLS connection
    680  * @conn: TLSv1 client connection data from tlsv1_client_init()
    681  * @keys: Structure of key/random data (filled on success)
    682  * Returns: 0 on success, -1 on failure
    683  */
    684 int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
    685 {
    686 	os_memset(keys, 0, sizeof(*keys));
    687 	if (conn->state == CLIENT_HELLO)
    688 		return -1;
    689 
    690 	keys->client_random = conn->client_random;
    691 	keys->client_random_len = TLS_RANDOM_LEN;
    692 
    693 	if (conn->state != SERVER_HELLO) {
    694 		keys->server_random = conn->server_random;
    695 		keys->server_random_len = TLS_RANDOM_LEN;
    696 		keys->master_key = conn->master_secret;
    697 		keys->master_key_len = TLS_MASTER_SECRET_LEN;
    698 	}
    699 
    700 	return 0;
    701 }
    702 
    703 
    704 /**
    705  * tlsv1_client_get_keyblock_size - Get TLS key_block size
    706  * @conn: TLSv1 client connection data from tlsv1_client_init()
    707  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
    708  * failure
    709  */
    710 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
    711 {
    712 	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
    713 		return -1;
    714 
    715 	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
    716 		    conn->rl.iv_size);
    717 }
    718 
    719 
    720 /**
    721  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
    722  * @conn: TLSv1 client connection data from tlsv1_client_init()
    723  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
    724  * (TLS_CIPHER_*).
    725  * Returns: 0 on success, -1 on failure
    726  */
    727 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
    728 {
    729 	size_t count;
    730 	u16 *suites;
    731 
    732 	/* TODO: implement proper configuration of cipher suites */
    733 	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
    734 		count = 0;
    735 		suites = conn->cipher_suites;
    736 		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
    737 		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
    738 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
    739 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
    740 		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
    741 		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
    742 		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
    743 
    744 		/*
    745 		 * Cisco AP (at least 350 and 1200 series) local authentication
    746 		 * server does not know how to search cipher suites from the
    747 		 * list and seem to require that the last entry in the list is
    748 		 * the one that it wants to use. However, TLS specification
    749 		 * requires the list to be in the client preference order. As a
    750 		 * workaround, add anon-DH AES-128-SHA1 again at the end of the
    751 		 * list to allow the Cisco code to find it.
    752 		 */
    753 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
    754 		conn->num_cipher_suites = count;
    755 	}
    756 
    757 	return 0;
    758 }
    759 
    760 
    761 /**
    762  * tlsv1_client_set_cred - Set client credentials
    763  * @conn: TLSv1 client connection data from tlsv1_client_init()
    764  * @cred: Credentials from tlsv1_cred_alloc()
    765  * Returns: 0 on success, -1 on failure
    766  *
    767  * On success, the client takes ownership of the credentials block and caller
    768  * must not free it. On failure, caller is responsible for freeing the
    769  * credential block.
    770  */
    771 int tlsv1_client_set_cred(struct tlsv1_client *conn,
    772 			  struct tlsv1_credentials *cred)
    773 {
    774 	tlsv1_cred_free(conn->cred);
    775 	conn->cred = cred;
    776 	return 0;
    777 }
    778 
    779 
    780 void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
    781 {
    782 	conn->disable_time_checks = !enabled;
    783 }
    784 
    785 
    786 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
    787 					tlsv1_client_session_ticket_cb cb,
    788 					void *ctx)
    789 {
    790 	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
    791 		   cb, ctx);
    792 	conn->session_ticket_cb = cb;
    793 	conn->session_ticket_cb_ctx = ctx;
    794 }
    795