tls_openssl.c

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	/*
	 * Give TLS handshake data from the client (if available) to OpenSSL
	 * for processing.
	 */
	if (in_data &&
	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Handshake failed - BIO_write");
		return NULL;
	}

	/* Initiate TLS handshake or continue the existing handshake */
	res = SSL_accept(conn->ssl);
	if (res != 1) {
		int err = SSL_get_error(conn->ssl, res);
		if (err == SSL_ERROR_WANT_READ)
			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want "
				   "more data");
		else if (err == SSL_ERROR_WANT_WRITE)
			wpa_printf(MSG_DEBUG, "SSL: SSL_accept - want to "
				   "write");
		else {
			tls_show_errors(MSG_INFO, __func__, "SSL_accept");
			return NULL;
		}
	}

	/* Get the TLS handshake data to be sent to the client */
	res = BIO_ctrl_pending(conn->ssl_out);
	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
	out_data = os_malloc(res == 0 ? 1 : res);
	if (out_data == NULL) {
		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
			   "handshake output (%d bytes)", res);
		if (BIO_reset(conn->ssl_out) < 0) {
			tls_show_errors(MSG_INFO, __func__,
					"BIO_reset failed");
		}
		*out_len = 0;
		return NULL;
	}
	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
	if (res < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Handshake failed - BIO_read");
		if (BIO_reset(conn->ssl_out) < 0) {
			tls_show_errors(MSG_INFO, __func__,
					"BIO_reset failed");
		}
		*out_len = 0;
		return NULL;
	}
	*out_len = res;
	return out_data;
}


int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
			   const u8 *in_data, size_t in_len,
			   u8 *out_data, size_t out_len)
{
	int res;

	if (conn == NULL)
		return -1;

	/* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
	if ((res = BIO_reset(conn->ssl_in)) < 0 ||
	    (res = BIO_reset(conn->ssl_out)) < 0) {
		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
		return res;
	}
	res = SSL_write(conn->ssl, in_data, in_len);
	if (res < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Encryption failed - SSL_write");
		return res;
	}

	/* Read encrypted data to be sent to the server */
	res = BIO_read(conn->ssl_out, out_data, out_len);
	if (res < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Encryption failed - BIO_read");
		return res;
	}

	return res;
}


int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
			   const u8 *in_data, size_t in_len,
			   u8 *out_data, size_t out_len)
{
	int res;

	/* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
	res = BIO_write(conn->ssl_in, in_data, in_len);
	if (res < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Decryption failed - BIO_write");
		return res;
	}
	if (BIO_reset(conn->ssl_out) < 0) {
		tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
		return res;
	}

	/* Read decrypted data for further processing */
	res = SSL_read(conn->ssl, out_data, out_len);
	if (res < 0) {
		tls_show_errors(MSG_INFO, __func__,
				"Decryption failed - SSL_read");
		return res;
	}

	return res;
}


int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
{
	return conn ? conn->ssl->hit : 0;
}


int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
				   u8 *ciphers)
{
	char buf[100], *pos, *end;
	u8 *c;
	int ret;

	if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
		return -1;

	buf[0] = '\0';
	pos = buf;
	end = pos + sizeof(buf);

	c = ciphers;
	while (*c != TLS_CIPHER_NONE) {
		const char *suite;

		switch (*c) {
		case TLS_CIPHER_RC4_SHA:
			suite = "RC4-SHA";
			break;
		case TLS_CIPHER_AES128_SHA:
			suite = "AES128-SHA";
			break;
		case TLS_CIPHER_RSA_DHE_AES128_SHA:
			suite = "DHE-RSA-AES128-SHA";
			break;
		case TLS_CIPHER_ANON_DH_AES128_SHA:
			suite = "ADH-AES128-SHA";
			break;
		default:
			wpa_printf(MSG_DEBUG, "TLS: Unsupported "
				   "cipher selection: %d", *c);
			return -1;
		}
		ret = os_snprintf(pos, end - pos, ":%s", suite);
		if (ret < 0 || ret >= end - pos)
			break;
		pos += ret;

		c++;
	}

	wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);

	if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
		tls_show_errors(MSG_INFO, __func__,
				"Cipher suite configuration failed");
		return -1;
	}

	return 0;
}


int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
		   char *buf, size_t buflen)
{
	const char *name;
	if (conn == NULL || conn->ssl == NULL)
		return -1;

	name = SSL_get_cipher(conn->ssl);
	if (name == NULL)
		return -1;

	os_strlcpy(buf, name, buflen);
	return 0;
}


int tls_connection_enable_workaround(void *ssl_ctx,
				     struct tls_connection *conn)
{
	SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);

	return 0;
}


#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
/* ClientHello TLS extensions require a patch to openssl, so this function is
 * commented out unless explicitly needed for EAP-FAST in order to be able to
 * build this file with unmodified openssl. */
int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
				    int ext_type, const u8 *data,
				    size_t data_len)
{
	if (conn == NULL || conn->ssl == NULL || ext_type != 35)
		return -1;

#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
	if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
				       data_len) != 1)
		return -1;
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
	if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
				    data_len) != 1)
		return -1;
#endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */

	return 0;
}
#endif /* EAP_FAST || EAP_FAST_DYNAMIC */


int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->failed;
}


int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->read_alerts;
}


int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->write_alerts;
}


int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
			      const struct tls_connection_params *params)
{
	int ret;
	unsigned long err;

	if (conn == NULL)
		return -1;

	while ((err = ERR_get_error())) {
		wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
			   __func__, ERR_error_string(err, NULL));
	}

	if (params->engine) {
		wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
		ret = tls_engine_init(conn, params->engine_id, params->pin,
				      params->key_id, params->cert_id,
				      params->ca_cert_id);
		if (ret)
			return ret;
	}
	if (tls_connection_set_subject_match(conn,
					     params->subject_match,
					     params->altsubject_match))
		return -1;

	if (params->engine && params->ca_cert_id) {
		if (tls_connection_engine_ca_cert(tls_ctx, conn,
						  params->ca_cert_id))
			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
	} else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
					  params->ca_cert_blob,
					  params->ca_cert_blob_len,
					  params->ca_path))
		return -1;

	if (params->engine && params->cert_id) {
		if (tls_connection_engine_client_cert(conn, params->cert_id))
			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
	} else if (tls_connection_client_cert(conn, params->client_cert,
					      params->client_cert_blob,
					      params->client_cert_blob_len))
		return -1;

	if (params->engine && params->key_id) {
		wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
		if (tls_connection_engine_private_key(conn))
			return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
	} else if (tls_connection_private_key(tls_ctx, conn,
					      params->private_key,
					      params->private_key_passwd,
					      params->private_key_blob,
					      params->private_key_blob_len)) {
		wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
			   params->private_key);
		return -1;
	}

	if (tls_connection_dh(conn, params->dh_file)) {
		wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
			   params->dh_file);
		return -1;
	}

	tls_get_errors(tls_ctx);

	return 0;
}


int tls_global_set_params(void *tls_ctx,
			  const struct tls_connection_params *params)
{
	SSL_CTX *ssl_ctx = tls_ctx;
	unsigned long err;

	while ((err = ERR_get_error())) {
		wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
			   __func__, ERR_error_string(err, NULL));
	}

	if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
		return -1;

	if (tls_global_client_cert(ssl_ctx, params->client_cert))
		return -1;

	if (tls_global_private_key(ssl_ctx, params->private_key,
				   params->private_key_passwd))
		return -1;

	if (tls_global_dh(ssl_ctx, params->dh_file)) {
		wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
			   params->dh_file);
		return -1;
	}

	return 0;
}


int tls_connection_get_keyblock_size(void *tls_ctx,
				     struct tls_connection *conn)
{
	const EVP_CIPHER *c;
	const EVP_MD *h;

	if (conn == NULL || conn->ssl == NULL ||
	    conn->ssl->enc_read_ctx == NULL ||
	    conn->ssl->enc_read_ctx->cipher == NULL ||
	    conn->ssl->read_hash == NULL)
		return -1;

	c = conn->ssl->enc_read_ctx->cipher;
#if OPENSSL_VERSION_NUMBER >= 0x00909000L
	h = EVP_MD_CTX_md(conn->ssl->read_hash);
#else
	h = conn->ssl->read_hash;
#endif

	return 2 * (EVP_CIPHER_key_length(c) +
		    EVP_MD_size(h) +
		    EVP_CIPHER_iv_length(c));
}


unsigned int tls_capabilities(void *tls_ctx)
{
	return 0;
}


int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
			  int tls_ia)
{
	return -1;
}


int tls_connection_ia_send_phase_finished(void *tls_ctx,
					  struct tls_connection *conn,
					  int final,
					  u8 *out_data, size_t out_len)
{
	return -1;
}


int tls_connection_ia_final_phase_finished(void *tls_ctx,
					   struct tls_connection *conn)
{
	return -1;
}


int tls_connection_ia_permute_inner_secret(void *tls_ctx,
					   struct tls_connection *conn,
					   const u8 *key, size_t key_len)
{
	return -1;
}


#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC)
/* Pre-shared secred requires a patch to openssl, so this function is
 * commented out unless explicitly needed for EAP-FAST in order to be able to
 * build this file with unmodified openssl. */

static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
			   STACK_OF(SSL_CIPHER) *peer_ciphers,
			   SSL_CIPHER **cipher, void *arg)
{
	struct tls_connection *conn = arg;
	int ret;

	if (conn == NULL || conn->session_ticket_cb == NULL)
		return 0;

	ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
				      conn->session_ticket,
				      conn->session_ticket_len,
				      s->s3->client_random,
				      s->s3->server_random, secret);
	os_free(conn->session_ticket);
	conn->session_ticket = NULL;

	if (ret <= 0)
		return 0;

	*secret_len = SSL_MAX_MASTER_KEY_LENGTH;
	return 1;
}


#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
				     int len, void *arg)
{
	struct tls_connection *conn = arg;

	if (conn == NULL || conn->session_ticket_cb == NULL)
		return 0;

	wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);

	os_free(conn->session_ticket);
	conn->session_ticket = NULL;

	wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
		    "extension", data, len);

	conn->session_ticket = os_malloc(len);
	if (conn->session_ticket == NULL)
		return 0;

	os_memcpy(conn->session_ticket, data, len);
	conn->session_ticket_len = len;

	return 1;
}
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
#ifdef SSL_OP_NO_TICKET
static void tls_hello_ext_cb(SSL *s, int client_server, int type,
			     unsigned char *data, int len, void *arg)
{
	struct tls_connection *conn = arg;

	if (conn == NULL || conn->session_ticket_cb == NULL)
		return;

	wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
		   type, len);

	if (type == TLSEXT_TYPE_session_ticket && !client_server) {
		os_free(conn->session_ticket);
		conn->session_ticket = NULL;

		wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
			    "extension", data, len);
		conn->session_ticket = os_malloc(len);
		if (conn->session_ticket == NULL)
			return;

		os_memcpy(conn->session_ticket, data, len);
		conn->session_ticket_len = len;
	}
}
#else /* SSL_OP_NO_TICKET */
static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
{
	struct tls_connection *conn = arg;

	if (conn == NULL || conn->session_ticket_cb == NULL)
		return 0;

	wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
		   ext->type, ext->length);

	os_free(conn->session_ticket);
	conn->session_ticket = NULL;

	if (ext->type == 35) {
		wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
			    "extension", ext->data, ext->length);
		conn->session_ticket = os_malloc(ext->length);
		if (conn->session_ticket == NULL)
			return SSL_AD_INTERNAL_ERROR;

		os_memcpy(conn->session_ticket, ext->data, ext->length);
		conn->session_ticket_l