310 lines
9.0 KiB
C++
310 lines
9.0 KiB
C++
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file ssl.c - SSL generic functions
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*
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* SSL is intended to be available in conjunction with a variety of protocols
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* on either the client or server side.
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 02/02/16 Martin Brampton Initial implementation
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*
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* @endverbatim
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <sys/ioctl.h>
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#include <maxscale/dcb.h>
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#include <maxscale/log_manager.h>
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#include <maxscale/poll.h>
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#include <maxscale/service.h>
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/**
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* @brief Check client's SSL capability and start SSL if appropriate.
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*
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* The protocol should determine whether the client is SSL capable and pass
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* the result as the second parameter. If the listener requires SSL but the
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* client is not SSL capable, an error message is recorded and failure return
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* given. If both sides want SSL, and SSL is not already established, the
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* process is triggered by calling dcb_accept_SSL.
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*
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* @param dcb Request handler DCB connected to the client
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* @param is_capable Indicates if the client can handle SSL
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* @return 0 if ok, >0 if a problem - see return codes defined in ssl.h
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*/
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int ssl_authenticate_client(DCB *dcb, bool is_capable)
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{
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const char *user = dcb->user ? dcb->user : "";
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const char *remote = dcb->remote ? dcb->remote : "";
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const char *service = (dcb->service && dcb->service->name) ? dcb->service->name : "";
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if (NULL == dcb->listener || NULL == dcb->listener->ssl)
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{
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/* Not an SSL connection on account of listener configuration */
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return SSL_AUTH_CHECKS_OK;
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}
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/* Now we require an SSL connection */
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if (!is_capable)
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{
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/* Should be SSL, but client is not SSL capable */
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MXS_INFO("User %s@%s connected to service '%s' without SSL when SSL was required.",
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user, remote, service);
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return SSL_ERROR_CLIENT_NOT_SSL;
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}
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/* Now we know SSL is required and client is capable */
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if (dcb->ssl_state != SSL_HANDSHAKE_DONE && dcb->ssl_state != SSL_ESTABLISHED)
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{
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int return_code;
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/** Do the SSL Handshake */
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if (SSL_HANDSHAKE_UNKNOWN == dcb->ssl_state)
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{
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dcb->ssl_state = SSL_HANDSHAKE_REQUIRED;
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}
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/**
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* Note that this will often fail to achieve its result, because further
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* reading (or possibly writing) of SSL related information is needed.
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* When that happens, there is a call in poll.c so that an EPOLLIN
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* event that arrives while the SSL state is SSL_HANDSHAKE_REQUIRED
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* will trigger dcb_accept_SSL. This situation does not result in a
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* negative return code - that indicates a real failure.
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*/
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return_code = dcb_accept_SSL(dcb);
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if (return_code < 0)
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{
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MXS_INFO("User %s@%s failed to connect to service '%s' with SSL.",
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user, remote, service);
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return SSL_ERROR_ACCEPT_FAILED;
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}
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else if (MXS_LOG_PRIORITY_IS_ENABLED(LOG_INFO))
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{
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if (1 == return_code)
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{
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MXS_INFO("User %s@%s connected to service '%s' with SSL.",
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user, remote, service);
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}
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else
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{
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MXS_INFO("User %s@%s connect to service '%s' with SSL in progress.",
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user, remote, service);
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}
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}
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}
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return SSL_AUTH_CHECKS_OK;
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}
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/**
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* @brief If an SSL connection is required, check that it has been established.
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*
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* This is called at the end of the authentication of a new connection.
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* If the result is not true, the data packet is abandoned with further
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* data expected from the client.
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*
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* @param dcb Request handler DCB connected to the client
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* @return Boolean to indicate whether connection is healthy
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*/
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bool
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ssl_is_connection_healthy(DCB *dcb)
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{
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/**
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* If SSL was never expected, or if the connection has state SSL_ESTABLISHED
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* then everything is as we wish. Otherwise, either there is a problem or
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* more to be done.
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*/
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return (NULL == dcb->listener ||
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NULL == dcb->listener->ssl ||
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dcb->ssl_state == SSL_ESTABLISHED);
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}
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/* Looks to be redundant - can remove include for ioctl too */
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bool
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ssl_check_data_to_process(DCB *dcb)
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{
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/** SSL authentication is still going on, we need to call dcb_accept_SSL
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* until it return 1 for success or -1 for error */
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if (dcb->ssl_state == SSL_HANDSHAKE_REQUIRED && 1 == dcb_accept_SSL(dcb))
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{
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int b = 0;
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ioctl(dcb->fd, FIONREAD, &b);
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if (b != 0)
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{
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return true;
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}
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else
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{
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MXS_DEBUG("[gw_read_client_event] No data in socket after SSL auth");
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}
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}
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return false;
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}
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/**
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* @brief Check whether a DCB requires SSL.
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*
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* This is a very simple test, but is placed in an SSL function so that
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* the knowledge of the SSL process is removed from the more general
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* handling of a connection in the protocols.
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*
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* @param dcb Request handler DCB connected to the client
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* @return Boolean indicating whether SSL is required.
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*/
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bool
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ssl_required_by_dcb(DCB *dcb)
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{
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return NULL != dcb->listener && NULL != dcb->listener->ssl;
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}
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/**
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* @brief Check whether a DCB requires SSL, but SSL is not yet negotiated.
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*
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* This is a very simple test, but is placed in an SSL function so that
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* the knowledge of the SSL process is removed from the more general
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* handling of a connection in the protocols.
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*
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* @param dcb Request handler DCB connected to the client
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* @return Boolean indicating whether SSL is required and not negotiated.
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*/
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bool
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ssl_required_but_not_negotiated(DCB *dcb)
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{
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return (NULL != dcb->listener &&
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NULL != dcb->listener->ssl &&
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SSL_HANDSHAKE_UNKNOWN == dcb->ssl_state);
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}
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/**
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* Returns an enum ssl_method_type value as string.
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*
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* @param method A method type.
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* @return The method type expressed as a string.
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*/
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const char* ssl_method_type_to_string(ssl_method_type_t method_type)
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{
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switch (method_type)
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{
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#ifndef OPENSSL_1_1
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case SERVICE_TLS10:
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return "TLSV10";
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#endif
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#ifdef OPENSSL_1_0
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case SERVICE_TLS11:
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return "TLSV11";
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case SERVICE_TLS12:
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return "TLSV12";
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#endif
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case SERVICE_SSL_MAX:
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case SERVICE_TLS_MAX:
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case SERVICE_SSL_TLS_MAX:
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return "MAX";
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default:
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return "Unknown";
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}
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}
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ssl_method_type_t string_to_ssl_method_type(const char* str)
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{
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if (strcasecmp("MAX", str) == 0)
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{
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return SERVICE_SSL_TLS_MAX;
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}
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#ifndef OPENSSL_1_1
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else if (strcasecmp("TLSV10", str) == 0)
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{
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return SERVICE_TLS10;
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}
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#endif
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#ifdef OPENSSL_1_0
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else if (strcasecmp("TLSV11", str) == 0)
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{
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return SERVICE_TLS11;
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}
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else if (strcasecmp("TLSV12", str) == 0)
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{
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return SERVICE_TLS12;
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}
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#endif
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return SERVICE_SSL_UNKNOWN;
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}
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void write_ssl_config(int fd, SSL_LISTENER* ssl)
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{
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if (ssl)
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{
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dprintf(fd, "ssl=required\n");
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if (ssl->ssl_cert)
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{
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dprintf(fd, "ssl_cert=%s\n", ssl->ssl_cert);
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}
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if (ssl->ssl_key)
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{
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dprintf(fd, "ssl_key=%s\n", ssl->ssl_key);
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}
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if (ssl->ssl_ca_cert)
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{
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dprintf(fd, "ssl_ca_cert=%s\n", ssl->ssl_ca_cert);
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}
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if (ssl->ssl_cert_verify_depth)
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{
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dprintf(fd, "ssl_cert_verify_depth=%d\n", ssl->ssl_cert_verify_depth);
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}
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dprintf(fd, "ssl_verify_peer_certificate=%s\n",
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ssl->ssl_verify_peer_certificate ? "true" : "false");
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const char *version = ssl_method_type_to_string(ssl->ssl_method_type);
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dprintf(fd, "ssl_version=%s\n", version);
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}
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}
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int ssl_authenticate_check_status(DCB* dcb)
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{
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int rval = MXS_AUTH_FAILED;
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/**
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* We record the SSL status before and after ssl authentication. This allows
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* us to detect if the SSL handshake is immediately completed, which means more
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* data needs to be read from the socket.
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*/
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bool health_before = ssl_is_connection_healthy(dcb);
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int ssl_ret = ssl_authenticate_client(dcb, dcb->authfunc.connectssl(dcb));
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bool health_after = ssl_is_connection_healthy(dcb);
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if (ssl_ret != 0)
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{
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rval = (ssl_ret == SSL_ERROR_CLIENT_NOT_SSL) ? MXS_AUTH_FAILED_SSL : MXS_AUTH_FAILED;
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}
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else if (!health_after)
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{
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rval = MXS_AUTH_SSL_INCOMPLETE;
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}
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else if (!health_before && health_after)
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{
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rval = MXS_AUTH_SSL_INCOMPLETE;
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poll_add_epollin_event_to_dcb(dcb, NULL);
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}
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else if (health_before && health_after)
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{
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rval = MXS_AUTH_SSL_COMPLETE;
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}
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return rval;
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}
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