tlsv1_client.c

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	u16 *suites;

	conn = os_zalloc(sizeof(*conn));
	if (conn == NULL)
		return NULL;

	conn->state = CLIENT_HELLO;

	if (tls_verify_hash_init(&conn->verify) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
			   "hash");
		os_free(conn);
		return NULL;
	}

	count = 0;
	suites = conn->cipher_suites;
#ifndef CONFIG_CRYPTO_INTERNAL
	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
#endif /* CONFIG_CRYPTO_INTERNAL */
	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
	suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
	conn->num_cipher_suites = count;

	return conn;
}


/**
 * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 */
void tlsv1_client_deinit(struct tlsv1_client *conn)
{
	crypto_public_key_free(conn->server_rsa_key);
	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
	tlsv1_record_change_write_cipher(&conn->rl);
	tlsv1_record_change_read_cipher(&conn->rl);
	tls_verify_hash_free(&conn->verify);
	os_free(conn->client_hello_ext);
	tlsv1_client_free_dh(conn);
	tlsv1_cred_free(conn->cred);
	os_free(conn);
}


/**
 * tlsv1_client_established - Check whether connection has been established
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if connection is established, 0 if not
 */
int tlsv1_client_established(struct tlsv1_client *conn)
{
	return conn->state == ESTABLISHED;
}


/**
 * tlsv1_client_prf - Use TLS-PRF to derive keying material
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @label: Label (e.g., description of the key) for PRF
 * @server_random_first: seed is 0 = client_random|server_random,
 * 1 = server_random|client_random
 * @out: Buffer for output data from TLS-PRF
 * @out_len: Length of the output buffer
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
		     int server_random_first, u8 *out, size_t out_len)
{
	u8 seed[2 * TLS_RANDOM_LEN];

	if (conn->state != ESTABLISHED)
		return -1;

	if (server_random_first) {
		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
			  TLS_RANDOM_LEN);
	} else {
		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
			  TLS_RANDOM_LEN);
	}

	return tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
		       label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
}


/**
 * tlsv1_client_get_cipher - Get current cipher name
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @buf: Buffer for the cipher name
 * @buflen: buf size
 * Returns: 0 on success, -1 on failure
 *
 * Get the name of the currently used cipher.
 */
int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
			    size_t buflen)
{
	char *cipher;

	switch (conn->rl.cipher_suite) {
	case TLS_RSA_WITH_RC4_128_MD5:
		cipher = "RC4-MD5";
		break;
	case TLS_RSA_WITH_RC4_128_SHA:
		cipher = "RC4-SHA";
		break;
	case TLS_RSA_WITH_DES_CBC_SHA:
		cipher = "DES-CBC-SHA";
		break;
	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
		cipher = "DES-CBC3-SHA";
		break;
	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
		cipher = "ADH-AES-128-SHA";
		break;
	case TLS_RSA_WITH_AES_256_CBC_SHA:
		cipher = "AES-256-SHA";
		break;
	case TLS_RSA_WITH_AES_128_CBC_SHA:
		cipher = "AES-128-SHA";
		break;
	default:
		return -1;
	}

	if (os_strlcpy(buf, cipher, buflen) >= buflen)
		return -1;
	return 0;
}


/**
 * tlsv1_client_shutdown - Shutdown TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_shutdown(struct tlsv1_client *conn)
{
	conn->state = CLIENT_HELLO;

	if (tls_verify_hash_init(&conn->verify) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
			   "hash");
		return -1;
	}

	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
	tlsv1_record_change_write_cipher(&conn->rl);
	tlsv1_record_change_read_cipher(&conn->rl);

	conn->certificate_requested = 0;
	crypto_public_key_free(conn->server_rsa_key);
	conn->server_rsa_key = NULL;
	conn->session_resumed = 0;

	return 0;
}


/**
 * tlsv1_client_resumed - Was session resumption used
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if current session used session resumption, 0 if not
 */
int tlsv1_client_resumed(struct tlsv1_client *conn)
{
	return !!conn->session_resumed;
}


/**
 * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ext_type: Extension type
 * @data: Extension payload (%NULL to remove extension)
 * @data_len: Extension payload length
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
			   const u8 *data, size_t data_len)
{
	u8 *pos;

	conn->session_ticket_included = 0;
	os_free(conn->client_hello_ext);
	conn->client_hello_ext = NULL;
	conn->client_hello_ext_len = 0;

	if (data == NULL || data_len == 0)
		return 0;

	pos = conn->client_hello_ext = os_malloc(6 + data_len);
	if (pos == NULL)
		return -1;

	WPA_PUT_BE16(pos, 4 + data_len);
	pos += 2;
	WPA_PUT_BE16(pos, ext_type);
	pos += 2;
	WPA_PUT_BE16(pos, data_len);
	pos += 2;
	os_memcpy(pos, data, data_len);
	conn->client_hello_ext_len = 6 + data_len;

	if (ext_type == TLS_EXT_PAC_OPAQUE) {
		conn->session_ticket_included = 1;
		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
	}

	return 0;
}


/**
 * tlsv1_client_get_keys - Get master key and random data from TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @keys: Structure of key/random data (filled on success)
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
{
	os_memset(keys, 0, sizeof(*keys));
	if (conn->state == CLIENT_HELLO)
		return -1;

	keys->client_random = conn->client_random;
	keys->client_random_len = TLS_RANDOM_LEN;

	if (conn->state != SERVER_HELLO) {
		keys->server_random = conn->server_random;
		keys->server_random_len = TLS_RANDOM_LEN;
		keys->master_key = conn->master_secret;
		keys->master_key_len = TLS_MASTER_SECRET_LEN;
	}

	return 0;
}


/**
 * tlsv1_client_get_keyblock_size - Get TLS key_block size
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 * failure
 */
int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
{
	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
		return -1;

	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
		    conn->rl.iv_size);
}


/**
 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 * (TLS_CIPHER_*).
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
{
#ifdef EAP_FAST
	size_t count;
	u16 *suites;

	/* TODO: implement proper configuration of cipher suites */
	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
		count = 0;
		suites = conn->cipher_suites;
#ifndef CONFIG_CRYPTO_INTERNAL
		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
#endif /* CONFIG_CRYPTO_INTERNAL */
		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;

		/*
		 * Cisco AP (at least 350 and 1200 series) local authentication
		 * server does not know how to search cipher suites from the
		 * list and seem to require that the last entry in the list is
		 * the one that it wants to use. However, TLS specification
		 * requires the list to be in the client preference order. As a
		 * workaround, ass anon-DH AES-128-SHA1 again at the end of the
		 * list to allow the Cisco code to find it.
		 */
		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
		conn->num_cipher_suites = count;
	}

	return 0;
#else /* EAP_FAST */
	return -1;
#endif /* EAP_FAST */
}


/**
 * tlsv1_client_set_cred - Set client credentials
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @cred: Credentials from tlsv1_cred_alloc()
 * Returns: 0 on success, -1 on failure
 *
 * On success, the client takes ownership of the credentials block and caller
 * must not free it. On failure, caller is responsible for freeing the
 * credential block.
 */
int tlsv1_client_set_cred(struct tlsv1_client *conn,
			  struct tlsv1_credentials *cred)
{
	tlsv1_cred_free(conn->cred);
	conn->cred = cred;
	return 0;
}


void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
					tlsv1_client_session_ticket_cb cb,
					void *ctx)
{
	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
		   cb, ctx);
	conn->session_ticket_cb = cb;
	conn->session_ticket_cb_ctx = ctx;
}