2039 lines
64 KiB
C++
2039 lines
64 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: 2022-01-01
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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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#define MXS_MODULE_NAME "mariadbbackend"
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#include <maxscale/alloc.h>
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#include <maxscale/limits.h>
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#include <maxscale/log.h>
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#include <maxscale/modinfo.h>
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#include <maxscale/modutil.h>
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#include <maxscale/poll.h>
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#include <maxscale/protocol.h>
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#include <maxscale/protocol/mysql.h>
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#include <maxscale/router.h>
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#include <maxscale/server.hh>
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#include <maxscale/utils.h>
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/*
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* MySQL Protocol module for handling the protocol between the gateway
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* and the backend MySQL database.
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*/
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static int gw_create_backend_connection(DCB* backend, SERVER* server, MXS_SESSION* in_session);
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static int gw_read_backend_event(DCB* dcb);
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static int gw_write_backend_event(DCB* dcb);
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static int gw_MySQLWrite_backend(DCB* dcb, GWBUF* queue);
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static int gw_error_backend_event(DCB* dcb);
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static int gw_backend_close(DCB* dcb);
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static int gw_backend_hangup(DCB* dcb);
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static int backend_write_delayqueue(DCB* dcb, GWBUF* buffer);
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static void backend_set_delayqueue(DCB* dcb, GWBUF* queue);
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static int gw_change_user(DCB* backend_dcb, SERVER* server, MXS_SESSION* in_session, GWBUF* queue);
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static char* gw_backend_default_auth();
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static GWBUF* process_response_data(DCB* dcb, GWBUF** readbuf, int nbytes_to_process);
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extern char* create_auth_failed_msg(GWBUF* readbuf, char* hostaddr, uint8_t* sha1);
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static bool sescmd_response_complete(DCB* dcb);
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static void gw_reply_on_error(DCB* dcb, mxs_auth_state_t state);
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static int gw_read_and_write(DCB* dcb);
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static int gw_do_connect_to_backend(char* host, int port, int* fd);
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static void inline close_socket(int socket);
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static GWBUF* gw_create_change_user_packet(MYSQL_session* mses,
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MySQLProtocol* protocol);
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static int gw_send_change_user_to_backend(char* dbname,
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char* user,
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uint8_t* passwd,
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MySQLProtocol* conn);
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static void gw_send_proxy_protocol_header(DCB* backend_dcb);
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static bool get_ip_string_and_port(struct sockaddr_storage* sa,
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char* ip,
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int iplen,
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in_port_t* port_out);
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static bool gw_connection_established(DCB* dcb);
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json_t* gw_json_diagnostics(DCB* dcb);
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extern "C"
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{
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/*
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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MXS_MODULE* MXS_CREATE_MODULE()
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{
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static MXS_PROTOCOL MyObject =
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{
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gw_read_backend_event, /* Read - EPOLLIN handler */
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gw_MySQLWrite_backend, /* Write - data from gateway */
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gw_write_backend_event, /* WriteReady - EPOLLOUT handler */
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gw_error_backend_event, /* Error - EPOLLERR handler */
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gw_backend_hangup, /* HangUp - EPOLLHUP handler */
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NULL, /* Accept */
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gw_create_backend_connection, /* Connect */
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gw_backend_close, /* Close */
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NULL, /* Listen */
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gw_change_user, /* Authentication */
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gw_backend_default_auth, /* Default authenticator */
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NULL, /* Connection limit reached */
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gw_connection_established,
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gw_json_diagnostics,
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};
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static MXS_MODULE info =
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{
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MXS_MODULE_API_PROTOCOL,
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MXS_MODULE_GA,
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MXS_PROTOCOL_VERSION,
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"The MySQL to backend server protocol",
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"V2.0.0",
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MXS_NO_MODULE_CAPABILITIES,
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&MyObject,
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NULL, /* Process init. */
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NULL, /* Process finish. */
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NULL, /* Thread init. */
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NULL, /* Thread finish. */
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{
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{MXS_END_MODULE_PARAMS}
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}
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};
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return &info;
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}
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}
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/**
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* The default authenticator name for this protocol
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*
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* This is not used for a backend protocol, it is for client authentication.
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*
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* @return name of authenticator
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*/
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static char* gw_backend_default_auth()
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{
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return const_cast<char*>("MySQLBackendAuth");
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}
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/*lint +e14 */
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/*******************************************************************************
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*******************************************************************************
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*
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* API Entry Point - Connect
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*
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* This is the first entry point that will be called in the life of a backend
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* (database) connection. It creates a protocol data structure and attempts
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* to open a non-blocking socket to the database. If it succeeds, the
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* protocol_auth_state will become MYSQL_CONNECTED.
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*
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*******************************************************************************
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******************************************************************************/
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/*
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* Create a new backend connection.
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*
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* This routine will connect to a backend server and it is called by dbc_connect
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* in router->newSession
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*
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* @param backend_dcb, in, out, use - backend DCB allocated from dcb_connect
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* @param server, in, use - server to connect to
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* @param session, in use - current session from client DCB
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* @return 0/1 on Success and -1 on Failure.
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* If succesful, returns positive fd to socket which is connected to
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* backend server. Positive fd is copied to protocol and to dcb.
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* If fails, fd == -1 and socket is closed.
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*/
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static int gw_create_backend_connection(DCB* backend_dcb,
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SERVER* server,
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MXS_SESSION* session)
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{
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MySQLProtocol* protocol = NULL;
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int rv = -1;
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int fd = -1;
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protocol = mysql_protocol_init(backend_dcb, -1);
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mxb_assert(protocol != NULL);
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if (protocol == NULL)
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{
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MXS_ERROR("Failed to create protocol object for backend connection.");
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goto return_fd;
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}
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/** Copy client flags to backend protocol */
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if (backend_dcb->session->client_dcb->protocol)
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{
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MySQLProtocol* client = (MySQLProtocol*)backend_dcb->session->client_dcb->protocol;
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protocol->client_capabilities = client->client_capabilities;
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protocol->charset = client->charset;
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protocol->extra_capabilities = client->extra_capabilities;
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}
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else
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{
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protocol->client_capabilities = (int)GW_MYSQL_CAPABILITIES_CLIENT;
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protocol->charset = 0x08;
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}
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/*
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*< if succeed, fd > 0, -1 otherwise
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* TODO: Better if function returned a protocol auth state
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*/
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rv = gw_do_connect_to_backend(server->address, server->port, &fd);
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/*< Assign protocol with backend_dcb */
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backend_dcb->protocol = protocol;
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/*< Set protocol state */
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switch (rv)
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{
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case 0:
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mxb_assert(fd > 0);
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protocol->fd = fd;
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protocol->protocol_auth_state = MXS_AUTH_STATE_CONNECTED;
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MXS_DEBUG("Established "
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"connection to %s:%i, protocol fd %d client "
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"fd %d.",
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server->address,
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server->port,
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protocol->fd,
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session->client_dcb->fd);
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if (server->proxy_protocol)
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{
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gw_send_proxy_protocol_header(backend_dcb);
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}
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break;
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case 1:
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/*
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* The state MYSQL_PENDING_CONNECT is likely to be transitory,
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* as it means the calls have been successful but the connection
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* has not yet completed and the calls are non-blocking.
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*/
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mxb_assert(fd > 0);
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protocol->protocol_auth_state = MXS_AUTH_STATE_PENDING_CONNECT;
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protocol->fd = fd;
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MXS_DEBUG("Connection "
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"pending to %s:%i, protocol fd %d client fd %d.",
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server->address,
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server->port,
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protocol->fd,
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session->client_dcb->fd);
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break;
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default:
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/* Failure - the state reverts to its initial value */
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mxb_assert(fd == -1);
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mxb_assert(protocol->protocol_auth_state == MXS_AUTH_STATE_INIT);
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break;
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} /*< switch */
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return_fd:
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return fd;
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}
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/**
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* gw_do_connect_to_backend
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*
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* This routine creates socket and connects to a backend server.
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* Connect it non-blocking operation. If connect fails, socket is closed.
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*
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* @param host The host to connect to
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* @param port The host TCP/IP port
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* @param *fd where connected fd is copied
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* @return 0/1 on success and -1 on failure
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* If successful, fd has file descriptor to socket which is connected to
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* backend server. In failure, fd == -1 and socket is closed.
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*
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*/
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static int gw_do_connect_to_backend(char* host, int port, int* fd)
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{
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struct sockaddr_storage serv_addr = {};
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int rv = -1;
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/* prepare for connect */
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int so = open_network_socket(MXS_SOCKET_NETWORK, &serv_addr, host, port);
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if (so == -1)
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{
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MXS_ERROR("Establishing connection to backend server [%s]:%d failed.", host, port);
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return rv;
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}
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rv = connect(so, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
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if (rv != 0)
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{
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if (errno == EINPROGRESS)
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{
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rv = 1;
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}
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else
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{
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MXS_ERROR("Failed to connect backend server [%s]:%d due to: %d, %s.",
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host,
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port,
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errno,
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mxs_strerror(errno));
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close(so);
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return rv;
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}
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}
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*fd = so;
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MXS_DEBUG("Connected to backend server [%s]:%d, fd %d.", host, port, so);
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return rv;
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}
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/**
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* @brief Check if the response contain an error
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*
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* @param buffer Buffer with a complete response
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* @return True if the reponse contains an MySQL error packet
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*/
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bool is_error_response(GWBUF* buffer)
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{
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uint8_t cmd;
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return gwbuf_copy_data(buffer, MYSQL_HEADER_LEN, 1, &cmd) && cmd == MYSQL_REPLY_ERR;
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}
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/**
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* @brief Log handshake failure
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*
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* @param dcb Backend DCB where authentication failed
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* @param buffer Buffer containing the response from the backend
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*/
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static void handle_error_response(DCB* dcb, GWBUF* buffer)
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{
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uint8_t* data = (uint8_t*)GWBUF_DATA(buffer);
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size_t len = MYSQL_GET_PAYLOAD_LEN(data);
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uint16_t errcode = MYSQL_GET_ERRCODE(data);
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char bufstr[len];
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memcpy(bufstr, data + 7, len - 3);
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bufstr[len - 3] = '\0';
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MXS_ERROR("Invalid authentication message from backend '%s'. Error code: %d, "
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"Msg : %s",
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dcb->server->name,
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errcode,
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bufstr);
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/** If the error is ER_HOST_IS_BLOCKED put the server into maintenace mode.
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* This will prevent repeated authentication failures. */
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if (errcode == ER_HOST_IS_BLOCKED)
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{
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MXS_ERROR("Server %s has been put into maintenance mode due "
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"to the server blocking connections from MaxScale. "
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"Run 'mysqladmin -h %s -P %d flush-hosts' on this "
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"server before taking this server out of maintenance "
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"mode.",
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dcb->server->name,
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dcb->server->address,
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dcb->server->port);
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mxs::server_set_status(dcb->server, SERVER_MAINT, NULL);
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}
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else if (errcode == ER_ACCESS_DENIED_ERROR
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|| errcode == ER_DBACCESS_DENIED_ERROR
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|| errcode == ER_ACCESS_DENIED_NO_PASSWORD_ERROR)
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{
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if (dcb->session->state != SESSION_STATE_DUMMY)
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{
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// Authentication failed, reload users
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service_refresh_users(dcb->service);
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}
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}
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}
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/**
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* @brief Handle the server's response packet
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*
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* This function reads the server's response packet and does the final step of
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* the authentication.
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*
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* @param dcb Backend DCB
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* @param buffer Buffer containing the server's complete handshake
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* @return MXS_AUTH_STATE_HANDSHAKE_FAILED on failure.
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*/
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mxs_auth_state_t handle_server_response(DCB* dcb, GWBUF* buffer)
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{
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MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
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mxs_auth_state_t rval = proto->protocol_auth_state == MXS_AUTH_STATE_CONNECTED
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? MXS_AUTH_STATE_HANDSHAKE_FAILED : MXS_AUTH_STATE_FAILED;
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if (dcb->authfunc.extract(dcb, buffer))
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{
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switch (dcb->authfunc.authenticate(dcb))
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{
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case MXS_AUTH_INCOMPLETE:
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case MXS_AUTH_SSL_INCOMPLETE:
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rval = MXS_AUTH_STATE_RESPONSE_SENT;
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break;
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case MXS_AUTH_SUCCEEDED:
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rval = MXS_AUTH_STATE_COMPLETE;
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default:
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break;
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}
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}
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return rval;
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}
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/**
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* @brief Prepare protocol for a write
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*
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* This prepares both the buffer and the protocol itself for writing a query
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* to the backend.
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*
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* @param dcb The backend DCB to write to
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* @param buffer Buffer that will be written
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*/
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static inline void prepare_for_write(DCB* dcb, GWBUF* buffer)
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{
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MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
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/**
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* The DCB's session is set to the dummy session when it is put into the
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* persistent connection pool. If this is not the dummy session, track
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* the current command being executed.
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*/
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if (!session_is_dummy(dcb->session))
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{
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uint64_t capabilities = service_get_capabilities(dcb->session->service);
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/**
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* Copy the current command being executed to this backend. For statement
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* based routers, this is tracked by using the current command being executed.
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* For routers that stream data, the client protocol command tracking data
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* is used which does not guarantee that the correct command is tracked if
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* something queues commands internally.
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*/
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if (rcap_type_required(capabilities, RCAP_TYPE_STMT_INPUT))
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{
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uint8_t* data = GWBUF_DATA(buffer);
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if (!proto->large_query)
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{
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proto->current_command = (mxs_mysql_cmd_t)MYSQL_GET_COMMAND(data);
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}
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/**
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* If the buffer contains a large query, we have to skip the command
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* byte extraction for the next packet. This way current_command always
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* contains the latest command executed on this backend.
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*/
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proto->large_query = MYSQL_GET_PAYLOAD_LEN(data) == MYSQL_PACKET_LENGTH_MAX;
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}
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else if (dcb->session->client_dcb && dcb->session->client_dcb->protocol)
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{
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MySQLProtocol* client_proto = (MySQLProtocol*)dcb->session->client_dcb->protocol;
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proto->current_command = client_proto->current_command;
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}
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}
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|
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if (GWBUF_SHOULD_COLLECT_RESULT(buffer))
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{
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proto->collect_result = true;
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}
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}
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|
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/*******************************************************************************
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*******************************************************************************
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*
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* API Entry Point - Read
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*
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* When the polling mechanism finds that new incoming data is available for
|
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* a backend connection, it will call this entry point, passing the relevant
|
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* DCB.
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*
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* The first time through, it is expected that protocol_auth_state will be
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* MYSQL_CONNECTED and an attempt will be made to send authentication data
|
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* to the backend server. The state may progress to MYSQL_AUTH_REC although
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* for an SSL connection this will not happen straight away, and the state
|
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* will remain MYSQL_CONNECTED.
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*
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* When the connection is fully established, it is expected that the state
|
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* will be MYSQL_IDLE and the information read from the backend will be
|
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* transferred to the client (front end).
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*
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*******************************************************************************
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******************************************************************************/
|
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|
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/**
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* Backend Read Event for EPOLLIN on the MySQL backend protocol module
|
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* @param dcb The backend Descriptor Control Block
|
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* @return 1 on operation, 0 for no action
|
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*/
|
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static int gw_read_backend_event(DCB* dcb)
|
|
{
|
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if (dcb->persistentstart)
|
|
{
|
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/** If a DCB gets a read event when it's in the persistent pool, it is
|
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* treated as if it were an error. */
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dcb->dcb_errhandle_called = true;
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return 0;
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}
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|
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if (dcb->session == NULL
|
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|| dcb->session->state == SESSION_STATE_DUMMY)
|
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{
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return 0;
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}
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|
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MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
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|
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MXS_DEBUG("Read dcb %p fd %d protocol state %d, %s.",
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dcb,
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dcb->fd,
|
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proto->protocol_auth_state,
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STRPROTOCOLSTATE(proto->protocol_auth_state));
|
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|
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int rc = 0;
|
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if (proto->protocol_auth_state == MXS_AUTH_STATE_COMPLETE)
|
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{
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rc = gw_read_and_write(dcb);
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}
|
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else
|
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{
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GWBUF* readbuf = NULL;
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|
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if (!read_complete_packet(dcb, &readbuf))
|
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{
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|
proto->protocol_auth_state = MXS_AUTH_STATE_FAILED;
|
|
gw_reply_on_error(dcb, proto->protocol_auth_state);
|
|
}
|
|
else if (readbuf)
|
|
{
|
|
/*
|
|
** We have a complete response from the server
|
|
** TODO: add support for non-contiguous responses
|
|
*/
|
|
readbuf = gwbuf_make_contiguous(readbuf);
|
|
MXS_ABORT_IF_NULL(readbuf);
|
|
|
|
if (is_error_response(readbuf))
|
|
{
|
|
/** The server responded with an error */
|
|
proto->protocol_auth_state = MXS_AUTH_STATE_FAILED;
|
|
handle_error_response(dcb, readbuf);
|
|
}
|
|
|
|
if (proto->protocol_auth_state == MXS_AUTH_STATE_CONNECTED)
|
|
{
|
|
mxs_auth_state_t state = MXS_AUTH_STATE_FAILED;
|
|
|
|
/** Read the server handshake and send the standard response */
|
|
if (gw_read_backend_handshake(dcb, readbuf))
|
|
{
|
|
state = gw_send_backend_auth(dcb);
|
|
}
|
|
|
|
proto->protocol_auth_state = state;
|
|
}
|
|
else if (proto->protocol_auth_state == MXS_AUTH_STATE_RESPONSE_SENT)
|
|
{
|
|
/** Read the message from the server. This will be the first
|
|
* packet that can contain authenticator specific data from the
|
|
* backend server. For 'mysql_native_password' it'll be an OK
|
|
* packet */
|
|
proto->protocol_auth_state = handle_server_response(dcb, readbuf);
|
|
}
|
|
|
|
if (proto->protocol_auth_state == MXS_AUTH_STATE_COMPLETE)
|
|
{
|
|
/** Authentication completed successfully */
|
|
GWBUF* localq = dcb->delayq;
|
|
dcb->delayq = NULL;
|
|
|
|
if (localq)
|
|
{
|
|
/** Send the queued commands to the backend */
|
|
prepare_for_write(dcb, localq);
|
|
rc = backend_write_delayqueue(dcb, localq);
|
|
}
|
|
}
|
|
else if (proto->protocol_auth_state == MXS_AUTH_STATE_FAILED
|
|
|| proto->protocol_auth_state == MXS_AUTH_STATE_HANDSHAKE_FAILED)
|
|
{
|
|
/** Authentication failed */
|
|
gw_reply_on_error(dcb, proto->protocol_auth_state);
|
|
}
|
|
|
|
gwbuf_free(readbuf);
|
|
}
|
|
else if (proto->protocol_auth_state == MXS_AUTH_STATE_CONNECTED
|
|
&& dcb->ssl_state == SSL_ESTABLISHED)
|
|
{
|
|
proto->protocol_auth_state = gw_send_backend_auth(dcb);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void do_handle_error(DCB* dcb, mxs_error_action_t action, const char* errmsg)
|
|
{
|
|
bool succp = true;
|
|
MXS_SESSION* session = dcb->session;
|
|
|
|
if (!dcb->dcb_errhandle_called)
|
|
{
|
|
GWBUF* errbuf = mysql_create_custom_error(1, 0, errmsg);
|
|
MXS_ROUTER_SESSION* rsession = static_cast<MXS_ROUTER_SESSION*>(session->router_session);
|
|
MXS_ROUTER_OBJECT* router = session->service->router;
|
|
MXS_ROUTER* router_instance = session->service->router_instance;
|
|
|
|
router->handleError(router_instance,
|
|
rsession,
|
|
errbuf,
|
|
dcb,
|
|
action,
|
|
&succp);
|
|
|
|
gwbuf_free(errbuf);
|
|
dcb->dcb_errhandle_called = true;
|
|
}
|
|
/**
|
|
* If error handler fails it means that routing session can't continue
|
|
* and it must be closed. In success, only this DCB is closed.
|
|
*/
|
|
if (!succp)
|
|
{
|
|
session->close_reason = SESSION_CLOSE_HANDLEERROR_FAILED;
|
|
poll_fake_hangup_event(session->client_dcb);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Authentication of backend - read the reply, or handle an error
|
|
*
|
|
* @param dcb Descriptor control block for backend server
|
|
* @param local_session The current MySQL session data structure
|
|
* @return
|
|
*/
|
|
static void gw_reply_on_error(DCB* dcb, mxs_auth_state_t state)
|
|
{
|
|
MXS_SESSION* session = dcb->session;
|
|
|
|
do_handle_error(dcb,
|
|
ERRACT_REPLY_CLIENT,
|
|
"Authentication with backend failed. Session will be closed.");
|
|
}
|
|
|
|
/**
|
|
* @brief Check if a reply can be routed to the client
|
|
*
|
|
* @param Backend DCB
|
|
* @return True if session is ready for reply routing
|
|
*/
|
|
static inline bool session_ok_to_route(DCB* dcb)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (dcb->session->state == SESSION_STATE_ROUTER_READY
|
|
&& dcb->session->client_dcb != NULL
|
|
&& dcb->session->client_dcb->state == DCB_STATE_POLLING
|
|
&& (dcb->session->router_session
|
|
|| service_get_capabilities(dcb->session->service) & RCAP_TYPE_NO_RSESSION))
|
|
{
|
|
MySQLProtocol* client_protocol = (MySQLProtocol*)dcb->session->client_dcb->protocol;
|
|
|
|
if (client_protocol)
|
|
{
|
|
if (client_protocol->protocol_auth_state == MXS_AUTH_STATE_COMPLETE)
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
else if (dcb->session->client_dcb->dcb_role == DCB_ROLE_INTERNAL)
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static inline bool expecting_resultset(MySQLProtocol* proto)
|
|
{
|
|
return proto->current_command == MXS_COM_QUERY
|
|
|| proto->current_command == MXS_COM_STMT_EXECUTE
|
|
|| /**
|
|
* The addition of COM_STMT_FETCH to the list of commands that produce
|
|
* result sets is slightly wrong. The command can generate complete
|
|
* result sets but it can also generate incomplete ones if cursors
|
|
* are used. The use of cursors most likely needs to be detected on
|
|
* an upper level and the use of this function avoided in those cases.
|
|
*/
|
|
proto->current_command == MXS_COM_STMT_FETCH;
|
|
}
|
|
|
|
static inline bool expecting_ps_response(MySQLProtocol* proto)
|
|
{
|
|
return proto->current_command == MXS_COM_STMT_PREPARE;
|
|
}
|
|
|
|
static inline bool complete_ps_response(GWBUF* buffer)
|
|
{
|
|
mxb_assert(GWBUF_IS_CONTIGUOUS(buffer));
|
|
MXS_PS_RESPONSE resp;
|
|
bool rval = false;
|
|
|
|
if (mxs_mysql_extract_ps_response(buffer, &resp))
|
|
{
|
|
int expected_eof = 0;
|
|
|
|
if (resp.columns > 0)
|
|
{
|
|
expected_eof++;
|
|
}
|
|
|
|
if (resp.parameters > 0)
|
|
{
|
|
expected_eof++;
|
|
}
|
|
|
|
bool more;
|
|
int n_eof = modutil_count_signal_packets(buffer, 0, &more, NULL);
|
|
|
|
MXS_DEBUG("Expecting %u EOF, have %u", n_eof, expected_eof);
|
|
|
|
rval = n_eof == expected_eof;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static inline bool collecting_resultset(MySQLProtocol* proto, uint64_t capabilities)
|
|
{
|
|
return rcap_type_required(capabilities, RCAP_TYPE_RESULTSET_OUTPUT)
|
|
|| proto->collect_result;
|
|
}
|
|
|
|
/**
|
|
* Helpers for checking OK and ERR packets specific to COM_CHANGE_USER
|
|
*/
|
|
static inline bool not_ok_packet(const GWBUF* buffer)
|
|
{
|
|
uint8_t* data = GWBUF_DATA(buffer);
|
|
|
|
return data[4] != MYSQL_REPLY_OK
|
|
|| // Should be more than 7 bytes of payload
|
|
gw_mysql_get_byte3(data) < MYSQL_OK_PACKET_MIN_LEN - MYSQL_HEADER_LEN
|
|
|| // Should have no affected rows
|
|
data[5] != 0
|
|
|| // Should not generate an insert ID
|
|
data[6] != 0;
|
|
}
|
|
|
|
static inline bool not_err_packet(const GWBUF* buffer)
|
|
{
|
|
return GWBUF_DATA(buffer)[4] != MYSQL_REPLY_ERR;
|
|
}
|
|
|
|
static inline bool auth_change_requested(GWBUF* buf)
|
|
{
|
|
return mxs_mysql_get_command(buf) == MYSQL_REPLY_AUTHSWITCHREQUEST
|
|
&& gwbuf_length(buf) > MYSQL_EOF_PACKET_LEN;
|
|
}
|
|
|
|
static bool handle_auth_change_response(GWBUF* reply, MySQLProtocol* proto, DCB* dcb)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (strcmp((char*)GWBUF_DATA(reply) + 5, DEFAULT_MYSQL_AUTH_PLUGIN) == 0)
|
|
{
|
|
/**
|
|
* The server requested a change of authentication methods.
|
|
* If we're changing the authentication method to the same one we
|
|
* are using now, it means that the server is simply generating
|
|
* a new scramble for the re-authentication process.
|
|
*/
|
|
|
|
// Load the new scramble into the protocol...
|
|
gwbuf_copy_data(reply,
|
|
5 + strlen(DEFAULT_MYSQL_AUTH_PLUGIN) + 1,
|
|
GW_MYSQL_SCRAMBLE_SIZE,
|
|
proto->scramble);
|
|
|
|
/// ... and use it to send the encrypted password to the server
|
|
rval = send_mysql_native_password_response(dcb);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief With authentication completed, read new data and write to backend
|
|
*
|
|
* @param dcb Descriptor control block for backend server
|
|
* @param local_session Current MySQL session data structure
|
|
* @return 0 is fail, 1 is success
|
|
*/
|
|
static int gw_read_and_write(DCB* dcb)
|
|
{
|
|
GWBUF* read_buffer = NULL;
|
|
MXS_SESSION* session = dcb->session;
|
|
int nbytes_read;
|
|
int return_code = 0;
|
|
|
|
/* read available backend data */
|
|
return_code = dcb_read(dcb, &read_buffer, 0);
|
|
|
|
if (return_code < 0)
|
|
{
|
|
do_handle_error(dcb, ERRACT_NEW_CONNECTION, "Read from backend failed");
|
|
return 0;
|
|
}
|
|
|
|
nbytes_read = gwbuf_length(read_buffer);
|
|
if (nbytes_read == 0)
|
|
{
|
|
mxb_assert(read_buffer == NULL);
|
|
return return_code;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(read_buffer != NULL);
|
|
}
|
|
|
|
/** Ask what type of output the router/filter chain expects */
|
|
uint64_t capabilities = service_get_capabilities(session->service);
|
|
bool result_collected = false;
|
|
MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
|
|
|
|
if (rcap_type_required(capabilities, RCAP_TYPE_PACKET_OUTPUT)
|
|
|| rcap_type_required(capabilities, RCAP_TYPE_CONTIGUOUS_OUTPUT)
|
|
|| proto->collect_result
|
|
|| proto->ignore_replies != 0)
|
|
{
|
|
GWBUF* tmp = modutil_get_complete_packets(&read_buffer);
|
|
/* Put any residue into the read queue */
|
|
|
|
dcb_readq_set(dcb, read_buffer);
|
|
|
|
if (tmp == NULL)
|
|
{
|
|
/** No complete packets */
|
|
return 0;
|
|
}
|
|
|
|
/** Get sesion track info from ok packet and save it to gwbuf properties.
|
|
*
|
|
* The OK packets sent in response to COM_STMT_PREPARE are of a different
|
|
* format so we need to detect and skip them. */
|
|
if (rcap_type_required(capabilities, RCAP_TYPE_SESSION_STATE_TRACKING)
|
|
&& !expecting_ps_response(proto))
|
|
{
|
|
mxs_mysql_get_session_track_info(tmp, proto);
|
|
}
|
|
|
|
read_buffer = tmp;
|
|
|
|
if (rcap_type_required(capabilities, RCAP_TYPE_CONTIGUOUS_OUTPUT)
|
|
|| proto->collect_result
|
|
|| proto->ignore_replies != 0)
|
|
{
|
|
if ((tmp = gwbuf_make_contiguous(read_buffer)))
|
|
{
|
|
read_buffer = tmp;
|
|
}
|
|
else
|
|
{
|
|
/** Failed to make the buffer contiguous */
|
|
gwbuf_free(read_buffer);
|
|
poll_fake_hangup_event(dcb);
|
|
return 0;
|
|
}
|
|
|
|
if (collecting_resultset(proto, capabilities))
|
|
{
|
|
if (expecting_resultset(proto))
|
|
{
|
|
if (mxs_mysql_is_result_set(read_buffer))
|
|
{
|
|
bool more = false;
|
|
if (modutil_count_signal_packets(read_buffer, 0, &more, NULL) != 2)
|
|
{
|
|
dcb_readq_prepend(dcb, read_buffer);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Collected the complete result
|
|
proto->collect_result = false;
|
|
result_collected = true;
|
|
}
|
|
else if (expecting_ps_response(proto))
|
|
{
|
|
if (mxs_mysql_is_prep_stmt_ok(read_buffer)
|
|
&& !complete_ps_response(read_buffer))
|
|
{
|
|
dcb_readq_prepend(dcb, read_buffer);
|
|
return 0;
|
|
}
|
|
|
|
// Collected the complete result
|
|
proto->collect_result = false;
|
|
result_collected = true;
|
|
}
|
|
else
|
|
{
|
|
// Assume that everything else responds with an single packet
|
|
proto->collect_result = false;
|
|
result_collected = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (proto->changing_user)
|
|
{
|
|
if (auth_change_requested(read_buffer)
|
|
&& handle_auth_change_response(read_buffer, proto, dcb))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* The client protocol always requests an authentication method
|
|
* switch to the same plugin to be compatible with most connectors.
|
|
*
|
|
* To prevent packet sequence number mismatch, always return a sequence
|
|
* of 3 for the final response to a COM_CHANGE_USER.
|
|
*/
|
|
GWBUF_DATA(read_buffer)[3] = 0x3;
|
|
proto->changing_user = false;
|
|
}
|
|
}
|
|
|
|
if (proto->ignore_replies > 0)
|
|
{
|
|
/** The reply to a COM_CHANGE_USER is in packet */
|
|
GWBUF* query = proto->stored_query;
|
|
proto->stored_query = NULL;
|
|
proto->ignore_replies--;
|
|
mxb_assert(proto->ignore_replies >= 0);
|
|
GWBUF* reply = modutil_get_next_MySQL_packet(&read_buffer);
|
|
|
|
while (read_buffer)
|
|
{
|
|
/** Skip to the last packet if we get more than one */
|
|
gwbuf_free(reply);
|
|
reply = modutil_get_next_MySQL_packet(&read_buffer);
|
|
}
|
|
|
|
mxb_assert(reply);
|
|
mxb_assert(!read_buffer);
|
|
uint8_t result = MYSQL_GET_COMMAND(GWBUF_DATA(reply));
|
|
int rval = 0;
|
|
|
|
if (result == MYSQL_REPLY_OK)
|
|
{
|
|
MXS_INFO("Response to COM_CHANGE_USER is OK, writing stored query");
|
|
rval = query ? dcb->func.write(dcb, query) : 1;
|
|
}
|
|
else if (auth_change_requested(reply))
|
|
{
|
|
if (handle_auth_change_response(reply, proto, dcb))
|
|
{
|
|
/** Store the query until we know the result of the authentication
|
|
* method switch. */
|
|
proto->stored_query = query;
|
|
proto->ignore_replies++;
|
|
|
|
gwbuf_free(reply);
|
|
return rval;
|
|
}
|
|
else
|
|
{
|
|
/** The server requested a change to something other than
|
|
* the default auth plugin */
|
|
gwbuf_free(query);
|
|
poll_fake_hangup_event(dcb);
|
|
|
|
// TODO: Use the authenticators to handle COM_CHANGE_USER responses
|
|
MXS_ERROR("Received AuthSwitchRequest to '%s' when '%s' was expected",
|
|
(char*)GWBUF_DATA(reply) + 5,
|
|
DEFAULT_MYSQL_AUTH_PLUGIN);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* The ignorable command failed when we had a queued query from the
|
|
* client. Generate a fake hangup event to close the DCB and send
|
|
* an error to the client.
|
|
*/
|
|
if (result == MYSQL_REPLY_ERR)
|
|
{
|
|
/** The COM_CHANGE USER failed, generate a fake hangup event to
|
|
* close the DCB and send an error to the client. */
|
|
handle_error_response(dcb, reply);
|
|
}
|
|
else
|
|
{
|
|
/** This should never happen */
|
|
MXS_ERROR("Unknown response to COM_CHANGE_USER (0x%02hhx), "
|
|
"closing connection",
|
|
result);
|
|
}
|
|
|
|
gwbuf_free(query);
|
|
poll_fake_hangup_event(dcb);
|
|
}
|
|
|
|
gwbuf_free(reply);
|
|
return rval;
|
|
}
|
|
|
|
do
|
|
{
|
|
GWBUF* stmt = NULL;
|
|
|
|
if (result_collected)
|
|
{
|
|
/** The result set or PS response was collected, we know it's complete */
|
|
stmt = read_buffer;
|
|
read_buffer = NULL;
|
|
gwbuf_set_type(stmt, GWBUF_TYPE_RESULT);
|
|
}
|
|
else if (rcap_type_required(capabilities, RCAP_TYPE_STMT_OUTPUT)
|
|
&& !rcap_type_required(capabilities, RCAP_TYPE_RESULTSET_OUTPUT))
|
|
{
|
|
stmt = modutil_get_next_MySQL_packet(&read_buffer);
|
|
|
|
if (!GWBUF_IS_CONTIGUOUS(stmt))
|
|
{
|
|
// Make sure the buffer is contiguous
|
|
stmt = gwbuf_make_contiguous(stmt);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stmt = read_buffer;
|
|
read_buffer = NULL;
|
|
}
|
|
|
|
if (session_ok_to_route(dcb))
|
|
{
|
|
if (result_collected)
|
|
{
|
|
// Mark that this is a buffer containing a collected result
|
|
gwbuf_set_type(stmt, GWBUF_TYPE_RESULT);
|
|
}
|
|
|
|
session->service->router->clientReply(session->service->router_instance,
|
|
session->router_session,
|
|
stmt,
|
|
dcb);
|
|
return_code = 1;
|
|
}
|
|
else /*< session is closing; replying to client isn't possible */
|
|
{
|
|
gwbuf_free(stmt);
|
|
}
|
|
}
|
|
while (read_buffer);
|
|
|
|
return return_code;
|
|
}
|
|
|
|
/*
|
|
* EPOLLOUT handler for the MySQL Backend protocol module.
|
|
*
|
|
* @param dcb The descriptor control block
|
|
* @return 1 in success, 0 in case of failure,
|
|
*/
|
|
static int gw_write_backend_event(DCB* dcb)
|
|
{
|
|
int rc = 1;
|
|
|
|
if (dcb->state != DCB_STATE_POLLING)
|
|
{
|
|
/** Don't write to backend if backend_dcb is not in poll set anymore */
|
|
uint8_t* data = NULL;
|
|
bool com_quit = false;
|
|
|
|
if (dcb->writeq)
|
|
{
|
|
data = (uint8_t*) GWBUF_DATA(dcb->writeq);
|
|
com_quit = MYSQL_IS_COM_QUIT(data);
|
|
}
|
|
|
|
if (data)
|
|
{
|
|
rc = 0;
|
|
|
|
if (!com_quit)
|
|
{
|
|
mysql_send_custom_error(dcb->session->client_dcb,
|
|
1,
|
|
0,
|
|
"Writing to backend failed due invalid Maxscale state.");
|
|
MXS_ERROR("Attempt to write buffered data to backend "
|
|
"failed due internal inconsistent state: %s",
|
|
STRDCBSTATE(dcb->state));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_DEBUG("Dcb %p in state %s but there's nothing to write either.",
|
|
dcb,
|
|
STRDCBSTATE(dcb->state));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MySQLProtocol* backend_protocol = (MySQLProtocol*)dcb->protocol;
|
|
|
|
if (backend_protocol->protocol_auth_state == MXS_AUTH_STATE_PENDING_CONNECT)
|
|
{
|
|
backend_protocol->protocol_auth_state = MXS_AUTH_STATE_CONNECTED;
|
|
if (dcb->server->proxy_protocol)
|
|
{
|
|
gw_send_proxy_protocol_header(dcb);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
dcb_drain_writeq(dcb);
|
|
}
|
|
|
|
MXS_DEBUG("wrote to dcb %p fd %d, return %d", dcb, dcb->fd, rc);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Write function for backend DCB. Store command to protocol.
|
|
*
|
|
* @param dcb The DCB of the backend
|
|
* @param queue Queue of buffers to write
|
|
* @return 0 on failure, 1 on success
|
|
*/
|
|
static int gw_MySQLWrite_backend(DCB* dcb, GWBUF* queue)
|
|
{
|
|
MySQLProtocol* backend_protocol = static_cast<MySQLProtocol*>(dcb->protocol);
|
|
int rc = 0;
|
|
|
|
if (dcb->was_persistent)
|
|
{
|
|
mxb_assert(!dcb->fakeq);
|
|
mxb_assert(!dcb->readq);
|
|
mxb_assert(!dcb->delayq);
|
|
mxb_assert(!dcb->writeq);
|
|
mxb_assert(dcb->persistentstart == 0);
|
|
dcb->was_persistent = false;
|
|
mxb_assert(backend_protocol->ignore_replies >= 0);
|
|
backend_protocol->ignore_replies = 0;
|
|
|
|
if (dcb->state != DCB_STATE_POLLING
|
|
|| backend_protocol->protocol_auth_state != MXS_AUTH_STATE_COMPLETE)
|
|
{
|
|
MXS_INFO("DCB and protocol state do not qualify for pooling: %s, %s",
|
|
STRDCBSTATE(dcb->state),
|
|
STRPROTOCOLSTATE(backend_protocol->protocol_auth_state));
|
|
gwbuf_free(queue);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* This is a DCB that was just taken out of the persistent connection pool.
|
|
* We need to sent a COM_CHANGE_USER query to the backend to reset the
|
|
* session state.
|
|
*/
|
|
if (backend_protocol->stored_query)
|
|
{
|
|
/** It is possible that the client DCB is closed before the COM_CHANGE_USER
|
|
* response is received. */
|
|
gwbuf_free(backend_protocol->stored_query);
|
|
}
|
|
|
|
if (MYSQL_IS_COM_QUIT(GWBUF_DATA(queue)))
|
|
{
|
|
/** The connection is being closed before the first write to this
|
|
* backend was done. The COM_QUIT is ignored and the DCB will be put
|
|
* back into the pool once it's closed. */
|
|
MXS_INFO("COM_QUIT received as the first write, ignoring and "
|
|
"sending the DCB back to the pool.");
|
|
gwbuf_free(queue);
|
|
return 1;
|
|
}
|
|
|
|
GWBUF* buf = gw_create_change_user_packet(static_cast<MYSQL_session*>(dcb->session->client_dcb->data),
|
|
static_cast<MySQLProtocol*>(dcb->protocol));
|
|
int rc = 0;
|
|
|
|
if (dcb_write(dcb, buf))
|
|
{
|
|
MXS_INFO("Sent COM_CHANGE_USER");
|
|
backend_protocol->ignore_replies++;
|
|
backend_protocol->stored_query = queue;
|
|
rc = 1;
|
|
}
|
|
else
|
|
{
|
|
gwbuf_free(queue);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
else if (backend_protocol->ignore_replies > 0)
|
|
{
|
|
if (MYSQL_IS_COM_QUIT((uint8_t*)GWBUF_DATA(queue)))
|
|
{
|
|
/** The COM_CHANGE_USER was already sent but the session is already
|
|
* closing. */
|
|
MXS_INFO("COM_QUIT received while COM_CHANGE_USER is in progress, closing pooled connection");
|
|
gwbuf_free(queue);
|
|
poll_fake_hangup_event(dcb);
|
|
rc = 0;
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* We're still waiting on the reply to the COM_CHANGE_USER, append the
|
|
* buffer to the stored query. This is possible if the client sends
|
|
* BLOB data on the first command or is sending multiple COM_QUERY
|
|
* packets at one time.
|
|
*/
|
|
MXS_INFO("COM_CHANGE_USER in progress, appending query to queue");
|
|
backend_protocol->stored_query = gwbuf_append(backend_protocol->stored_query, queue);
|
|
rc = 1;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Pick action according to state of protocol.
|
|
* If auth failed, return value is 0, write and buffered write
|
|
* return 1.
|
|
*/
|
|
switch (backend_protocol->protocol_auth_state)
|
|
{
|
|
case MXS_AUTH_STATE_HANDSHAKE_FAILED:
|
|
case MXS_AUTH_STATE_FAILED:
|
|
if (dcb->session->state != SESSION_STATE_STOPPING)
|
|
{
|
|
MXS_ERROR("Unable to write to backend '%s' due to "
|
|
"%s failure. Server in state %s.",
|
|
dcb->server->name,
|
|
backend_protocol->protocol_auth_state == MXS_AUTH_STATE_HANDSHAKE_FAILED
|
|
? "handshake" : "authentication",
|
|
STRSRVSTATUS(dcb->server));
|
|
}
|
|
|
|
gwbuf_free(queue);
|
|
rc = 0;
|
|
|
|
break;
|
|
|
|
case MXS_AUTH_STATE_COMPLETE:
|
|
{
|
|
uint8_t* ptr = GWBUF_DATA(queue);
|
|
mxs_mysql_cmd_t cmd = static_cast<mxs_mysql_cmd_t>(mxs_mysql_get_command(queue));
|
|
|
|
MXS_DEBUG("write to dcb %p fd %d protocol state %s.",
|
|
dcb,
|
|
dcb->fd,
|
|
STRPROTOCOLSTATE(backend_protocol->protocol_auth_state));
|
|
|
|
prepare_for_write(dcb, queue);
|
|
|
|
if (cmd == MXS_COM_QUIT && dcb->server->persistpoolmax)
|
|
{
|
|
/** We need to keep the pooled connections alive so we just ignore the COM_QUIT packet */
|
|
gwbuf_free(queue);
|
|
rc = 1;
|
|
}
|
|
else
|
|
{
|
|
if (GWBUF_IS_IGNORABLE(queue))
|
|
{
|
|
/** The response to this command should be ignored */
|
|
backend_protocol->ignore_replies++;
|
|
mxb_assert(backend_protocol->ignore_replies > 0);
|
|
}
|
|
|
|
/** Write to backend */
|
|
rc = dcb_write(dcb, queue);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
{
|
|
MXS_DEBUG("delayed write to dcb %p fd %d protocol state %s.",
|
|
dcb,
|
|
dcb->fd,
|
|
STRPROTOCOLSTATE(backend_protocol->protocol_auth_state));
|
|
|
|
/** Store data until authentication is complete */
|
|
prepare_for_write(dcb, queue);
|
|
backend_set_delayqueue(dcb, queue);
|
|
rc = 1;
|
|
}
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Error event handler.
|
|
* Create error message, pass it to router's error handler and if error
|
|
* handler fails in providing enough backend servers, mark session being
|
|
* closed and call DCB close function which triggers closing router session
|
|
* and related backends (if any exists.
|
|
*/
|
|
static int gw_error_backend_event(DCB* dcb)
|
|
{
|
|
MXS_SESSION* session = dcb->session;
|
|
|
|
if (session->state == SESSION_STATE_DUMMY)
|
|
{
|
|
if (dcb->persistentstart == 0)
|
|
{
|
|
/** Not a persistent connection, something is wrong. */
|
|
MXS_ERROR("EPOLLERR event on a non-persistent DCB with no session. "
|
|
"Closing connection.");
|
|
}
|
|
dcb_close(dcb);
|
|
}
|
|
else if (dcb->state != DCB_STATE_POLLING || session->state != SESSION_STATE_ROUTER_READY)
|
|
{
|
|
int error;
|
|
int len = sizeof(error);
|
|
|
|
if (getsockopt(dcb->fd, SOL_SOCKET, SO_ERROR, &error, (socklen_t*) &len) == 0 && error != 0)
|
|
{
|
|
if (dcb->state != DCB_STATE_POLLING)
|
|
{
|
|
MXS_ERROR("DCB in state %s got error '%s'.",
|
|
STRDCBSTATE(dcb->state),
|
|
mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Error '%s' in session that is not ready for routing.",
|
|
mxs_strerror(errno));
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
do_handle_error(dcb, ERRACT_NEW_CONNECTION, "Lost connection to backend server.");
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Error event handler.
|
|
* Create error message, pass it to router's error handler and if error
|
|
* handler fails in providing enough backend servers, mark session being
|
|
* closed and call DCB close function which triggers closing router session
|
|
* and related backends (if any exists.
|
|
*
|
|
* @param dcb The current Backend DCB
|
|
* @return 1 always
|
|
*/
|
|
static int gw_backend_hangup(DCB* dcb)
|
|
{
|
|
MXS_SESSION* session = dcb->session;
|
|
|
|
if (dcb->persistentstart)
|
|
{
|
|
dcb->dcb_errhandle_called = true;
|
|
}
|
|
else if (session->state != SESSION_STATE_ROUTER_READY)
|
|
{
|
|
int error;
|
|
int len = sizeof(error);
|
|
if (getsockopt(dcb->fd, SOL_SOCKET, SO_ERROR, &error, (socklen_t*) &len) == 0)
|
|
{
|
|
if (error != 0 && session->state != SESSION_STATE_STOPPING)
|
|
{
|
|
MXS_ERROR("Hangup in session that is not ready for routing, "
|
|
"Error reported is '%s'.",
|
|
mxs_strerror(errno));
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
do_handle_error(dcb, ERRACT_NEW_CONNECTION, "Lost connection to backend server.");
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Send COM_QUIT to backend so that it can be closed.
|
|
* @param dcb The current Backend DCB
|
|
* @return 1 always
|
|
*/
|
|
static int gw_backend_close(DCB* dcb)
|
|
{
|
|
mxb_assert(dcb->session);
|
|
|
|
/** Send COM_QUIT to the backend being closed */
|
|
GWBUF* quitbuf = mysql_create_com_quit(NULL, 0);
|
|
mysql_send_com_quit(dcb, 0, quitbuf);
|
|
|
|
/** Free protocol data */
|
|
mysql_protocol_done(dcb);
|
|
|
|
MXS_SESSION* session = dcb->session;
|
|
|
|
/**
|
|
* If session state is SESSION_STATE_STOPPING, start closing client session.
|
|
* Otherwise only this backend connection is closed.
|
|
*/
|
|
if (session->client_dcb
|
|
&& session->state == SESSION_STATE_STOPPING
|
|
&& session->client_dcb->state == DCB_STATE_POLLING)
|
|
{
|
|
poll_fake_hangup_event(session->client_dcb);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* This routine put into the delay queue the input queue
|
|
* The input is what backend DCB is receiving
|
|
* The routine is called from func.write() when mysql backend connection
|
|
* is not yet complete buu there are inout data from client
|
|
*
|
|
* @param dcb The current backend DCB
|
|
* @param queue Input data in the GWBUF struct
|
|
*/
|
|
static void backend_set_delayqueue(DCB* dcb, GWBUF* queue)
|
|
{
|
|
/* Append data */
|
|
dcb->delayq = gwbuf_append(dcb->delayq, queue);
|
|
}
|
|
|
|
/**
|
|
* This routine writes the delayq via dcb_write
|
|
* The dcb->delayq contains data received from the client before
|
|
* mysql backend authentication succeded
|
|
*
|
|
* @param dcb The current backend DCB
|
|
* @return The dcb_write status
|
|
*/
|
|
static int backend_write_delayqueue(DCB* dcb, GWBUF* buffer)
|
|
{
|
|
mxb_assert(buffer);
|
|
mxb_assert(dcb->persistentstart == 0);
|
|
mxb_assert(!dcb->was_persistent);
|
|
|
|
if (MYSQL_IS_CHANGE_USER(((uint8_t*)GWBUF_DATA(buffer))))
|
|
{
|
|
/** Recreate the COM_CHANGE_USER packet with the scramble the backend sent to us */
|
|
MYSQL_session mses;
|
|
gw_get_shared_session_auth_info(dcb, &mses);
|
|
gwbuf_free(buffer);
|
|
buffer = gw_create_change_user_packet(&mses, static_cast<MySQLProtocol*>(dcb->protocol));
|
|
}
|
|
|
|
int rc = 1;
|
|
|
|
if (MYSQL_IS_COM_QUIT(((uint8_t*)GWBUF_DATA(buffer))) && dcb->server->persistpoolmax)
|
|
{
|
|
/** We need to keep the pooled connections alive so we just ignore the COM_QUIT packet */
|
|
gwbuf_free(buffer);
|
|
rc = 1;
|
|
}
|
|
else
|
|
{
|
|
rc = dcb_write(dcb, buffer);
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
do_handle_error(dcb, ERRACT_NEW_CONNECTION, "Lost connection to backend server.");
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* This routine handles the COM_CHANGE_USER command
|
|
*
|
|
* TODO: Move this into the authenticators
|
|
*
|
|
* @param dcb The current backend DCB
|
|
* @param server The backend server pointer
|
|
* @param in_session The current session data (MYSQL_session)
|
|
* @param queue The GWBUF containing the COM_CHANGE_USER receveid
|
|
* @return 1 on success and 0 on failure
|
|
*/
|
|
static int gw_change_user(DCB* backend,
|
|
SERVER* server,
|
|
MXS_SESSION* in_session,
|
|
GWBUF* queue)
|
|
{
|
|
MYSQL_session* current_session = NULL;
|
|
MySQLProtocol* backend_protocol = NULL;
|
|
MySQLProtocol* client_protocol = NULL;
|
|
char username[MYSQL_USER_MAXLEN + 1] = "";
|
|
char database[MYSQL_DATABASE_MAXLEN + 1] = "";
|
|
char current_database[MYSQL_DATABASE_MAXLEN + 1] = "";
|
|
uint8_t client_sha1[MYSQL_SCRAMBLE_LEN] = "";
|
|
uint8_t* client_auth_packet = GWBUF_DATA(queue);
|
|
unsigned int auth_token_len = 0;
|
|
uint8_t* auth_token = NULL;
|
|
int rv = -1;
|
|
int auth_ret = 1;
|
|
|
|
current_session = (MYSQL_session*)in_session->client_dcb->data;
|
|
backend_protocol = static_cast<MySQLProtocol*>(backend->protocol);
|
|
client_protocol = static_cast<MySQLProtocol*>(in_session->client_dcb->protocol);
|
|
|
|
/* now get the user, after 4 bytes header and 1 byte command */
|
|
client_auth_packet += 5;
|
|
size_t len = strlen((char*)client_auth_packet);
|
|
if (len > MYSQL_USER_MAXLEN)
|
|
{
|
|
MXS_ERROR("Client sent user name \"%s\",which is %lu characters long, "
|
|
"while a maximum length of %d is allowed. Cutting trailing "
|
|
"characters.",
|
|
(char*)client_auth_packet,
|
|
len,
|
|
MYSQL_USER_MAXLEN);
|
|
}
|
|
strncpy(username, (char*)client_auth_packet, MYSQL_USER_MAXLEN);
|
|
username[MYSQL_USER_MAXLEN] = 0;
|
|
|
|
client_auth_packet += (len + 1);
|
|
|
|
/* get the auth token len */
|
|
memcpy(&auth_token_len, client_auth_packet, 1);
|
|
|
|
client_auth_packet++;
|
|
|
|
/* allocate memory for token only if auth_token_len > 0 */
|
|
if (auth_token_len > 0)
|
|
{
|
|
auth_token = (uint8_t*)MXS_MALLOC(auth_token_len);
|
|
mxb_assert(auth_token != NULL);
|
|
|
|
if (auth_token == NULL)
|
|
{
|
|
return rv;
|
|
}
|
|
memcpy(auth_token, client_auth_packet, auth_token_len);
|
|
client_auth_packet += auth_token_len;
|
|
}
|
|
|
|
/* get new database name */
|
|
len = strlen((char*)client_auth_packet);
|
|
if (len > MYSQL_DATABASE_MAXLEN)
|
|
{
|
|
MXS_ERROR("Client sent database name \"%s\", which is %lu characters long, "
|
|
"while a maximum length of %d is allowed. Cutting trailing "
|
|
"characters.",
|
|
(char*)client_auth_packet,
|
|
len,
|
|
MYSQL_DATABASE_MAXLEN);
|
|
}
|
|
strncpy(database, (char*)client_auth_packet, MYSQL_DATABASE_MAXLEN);
|
|
database[MYSQL_DATABASE_MAXLEN] = 0;
|
|
|
|
client_auth_packet += (len + 1);
|
|
|
|
if (*client_auth_packet)
|
|
{
|
|
memcpy(&backend_protocol->charset, client_auth_packet, sizeof(int));
|
|
}
|
|
|
|
/* save current_database name */
|
|
strcpy(current_database, current_session->db);
|
|
|
|
/*
|
|
* Now clear database name in dcb as we don't do local authentication on db name for change user.
|
|
* Local authentication only for user@host and if successful the database name change is sent to backend.
|
|
*/
|
|
*current_session->db = 0;
|
|
|
|
/*
|
|
* Decode the token and check the password.
|
|
* Note: if auth_token_len == 0 && auth_token == NULL, user is without password
|
|
*/
|
|
DCB* dcb = backend->session->client_dcb;
|
|
|
|
if (dcb->authfunc.reauthenticate == NULL)
|
|
{
|
|
/** Authenticator does not support reauthentication */
|
|
rv = 0;
|
|
goto retblock;
|
|
}
|
|
|
|
auth_ret = dcb->authfunc.reauthenticate(dcb,
|
|
username,
|
|
auth_token,
|
|
auth_token_len,
|
|
client_protocol->scramble,
|
|
sizeof(client_protocol->scramble),
|
|
client_sha1,
|
|
sizeof(client_sha1));
|
|
|
|
strcpy(current_session->db, current_database);
|
|
|
|
if (auth_ret != 0)
|
|
{
|
|
if (service_refresh_users(backend->session->client_dcb->service) == 0)
|
|
{
|
|
/*
|
|
* Try authentication again with new repository data
|
|
* Note: if no auth client authentication will fail
|
|
*/
|
|
*current_session->db = 0;
|
|
|
|
auth_ret = dcb->authfunc.reauthenticate(dcb,
|
|
username,
|
|
auth_token,
|
|
auth_token_len,
|
|
client_protocol->scramble,
|
|
sizeof(client_protocol->scramble),
|
|
client_sha1,
|
|
sizeof(client_sha1));
|
|
|
|
strcpy(current_session->db, current_database);
|
|
}
|
|
}
|
|
|
|
MXS_FREE(auth_token);
|
|
|
|
if (auth_ret != 0)
|
|
{
|
|
bool password_set = false;
|
|
char* message = NULL;
|
|
|
|
if (auth_token_len > 0)
|
|
{
|
|
// If the length of the authentication token is non-0, then
|
|
// it means that the client provided a password.
|
|
password_set = true;
|
|
}
|
|
|
|
/**
|
|
* Create an error message and make it look like legit reply
|
|
* from backend server. Then make it look like an incoming event
|
|
* so that thread gets new task of it, calls clientReply
|
|
* which filters out duplicate errors from same cause and forward
|
|
* reply to the client.
|
|
*/
|
|
message = create_auth_fail_str(username,
|
|
backend->session->client_dcb->remote,
|
|
password_set,
|
|
NULL,
|
|
auth_ret);
|
|
if (message == NULL)
|
|
{
|
|
MXS_ERROR("Creating error message failed.");
|
|
rv = 0;
|
|
goto retblock;
|
|
}
|
|
|
|
modutil_reply_auth_error(backend, message, 0);
|
|
rv = 1;
|
|
}
|
|
else
|
|
{
|
|
/** This assumes that authentication will succeed. If authentication fails,
|
|
* the internal session will represent the wrong user. This is wrong and
|
|
* a check whether the COM_CHANGE_USER succeeded should be done in the
|
|
* backend protocol reply handling.
|
|
*
|
|
* For the time being, it is simpler to assume a COM_CHANGE_USER will always
|
|
* succeed if the authentication in MaxScale is successful. In practice this
|
|
* might not be true but these cases are handled by the router modules
|
|
* and the servers that fail to execute the COM_CHANGE_USER are discarded. */
|
|
strcpy(current_session->user, username);
|
|
strcpy(current_session->db, database);
|
|
memcpy(current_session->client_sha1, client_sha1, sizeof(current_session->client_sha1));
|
|
rv = gw_send_change_user_to_backend(database, username, client_sha1, backend_protocol);
|
|
}
|
|
|
|
retblock:
|
|
gwbuf_free(queue);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* Create COM_CHANGE_USER packet and store it to GWBUF
|
|
*
|
|
* @param mses MySQL session
|
|
* @param protocol protocol structure of the backend
|
|
*
|
|
* @return GWBUF buffer consisting of COM_CHANGE_USER packet
|
|
*
|
|
* @note the function doesn't fail
|
|
*/
|
|
static GWBUF* gw_create_change_user_packet(MYSQL_session* mses,
|
|
MySQLProtocol* protocol)
|
|
{
|
|
char* db;
|
|
char* user;
|
|
uint8_t* pwd;
|
|
GWBUF* buffer;
|
|
uint8_t* payload = NULL;
|
|
uint8_t* payload_start = NULL;
|
|
long bytes;
|
|
char dbpass[MYSQL_USER_MAXLEN + 1] = "";
|
|
char* curr_db = NULL;
|
|
uint8_t* curr_passwd = NULL;
|
|
unsigned int charset;
|
|
|
|
db = mses->db;
|
|
user = mses->user;
|
|
pwd = mses->client_sha1;
|
|
|
|
if (strlen(db) > 0)
|
|
{
|
|
curr_db = db;
|
|
}
|
|
|
|
if (memcmp(pwd, null_client_sha1, MYSQL_SCRAMBLE_LEN))
|
|
{
|
|
curr_passwd = pwd;
|
|
}
|
|
|
|
/* get charset the client sent and use it for connection auth */
|
|
charset = protocol->charset;
|
|
|
|
/**
|
|
* Protocol MySQL COM_CHANGE_USER for CLIENT_PROTOCOL_41
|
|
* 1 byte COMMAND
|
|
*/
|
|
bytes = 1;
|
|
|
|
/** add the user and a terminating char */
|
|
bytes += strlen(user);
|
|
bytes++;
|
|
/**
|
|
* next will be + 1 (scramble_len) + 20 (fixed_scramble) +
|
|
* (db + NULL term) + 2 bytes charset
|
|
*/
|
|
if (curr_passwd != NULL)
|
|
{
|
|
bytes += GW_MYSQL_SCRAMBLE_SIZE;
|
|
}
|
|
/** 1 byte for scramble_len */
|
|
bytes++;
|
|
/** db name and terminating char */
|
|
if (curr_db != NULL)
|
|
{
|
|
bytes += strlen(curr_db);
|
|
}
|
|
bytes++;
|
|
|
|
/** the charset */
|
|
bytes += 2;
|
|
bytes += strlen("mysql_native_password");
|
|
bytes++;
|
|
|
|
/** the packet header */
|
|
bytes += 4;
|
|
|
|
buffer = gwbuf_alloc(bytes);
|
|
|
|
// The COM_CHANGE_USER is a session command so the result must be collected
|
|
gwbuf_set_type(buffer, GWBUF_TYPE_COLLECT_RESULT);
|
|
|
|
payload = GWBUF_DATA(buffer);
|
|
memset(payload, '\0', bytes);
|
|
payload_start = payload;
|
|
|
|
/** set packet number to 0 */
|
|
payload[3] = 0x00;
|
|
payload += 4;
|
|
|
|
/** set the command COM_CHANGE_USER 0x11 */
|
|
payload[0] = 0x11;
|
|
payload++;
|
|
memcpy(payload, user, strlen(user));
|
|
payload += strlen(user);
|
|
payload++;
|
|
|
|
if (curr_passwd != NULL)
|
|
{
|
|
uint8_t hash1[GW_MYSQL_SCRAMBLE_SIZE] = "";
|
|
uint8_t hash2[GW_MYSQL_SCRAMBLE_SIZE] = "";
|
|
uint8_t new_sha[GW_MYSQL_SCRAMBLE_SIZE] = "";
|
|
uint8_t client_scramble[GW_MYSQL_SCRAMBLE_SIZE];
|
|
|
|
/** hash1 is the function input, SHA1(real_password) */
|
|
memcpy(hash1, pwd, GW_MYSQL_SCRAMBLE_SIZE);
|
|
|
|
/**
|
|
* hash2 is the SHA1(input data), where
|
|
* input_data = SHA1(real_password)
|
|
*/
|
|
gw_sha1_str(hash1, GW_MYSQL_SCRAMBLE_SIZE, hash2);
|
|
|
|
/** dbpass is the HEX form of SHA1(SHA1(real_password)) */
|
|
gw_bin2hex(dbpass, hash2, GW_MYSQL_SCRAMBLE_SIZE);
|
|
|
|
/** new_sha is the SHA1(CONCAT(scramble, hash2) */
|
|
gw_sha1_2_str(protocol->scramble,
|
|
GW_MYSQL_SCRAMBLE_SIZE,
|
|
hash2,
|
|
GW_MYSQL_SCRAMBLE_SIZE,
|
|
new_sha);
|
|
|
|
/** compute the xor in client_scramble */
|
|
gw_str_xor(client_scramble,
|
|
new_sha,
|
|
hash1,
|
|
GW_MYSQL_SCRAMBLE_SIZE);
|
|
|
|
/** set the auth-length */
|
|
*payload = GW_MYSQL_SCRAMBLE_SIZE;
|
|
payload++;
|
|
/**
|
|
* copy the 20 bytes scramble data after
|
|
* packet_buffer + 36 + user + NULL + 1 (byte of auth-length)
|
|
*/
|
|
memcpy(payload, client_scramble, GW_MYSQL_SCRAMBLE_SIZE);
|
|
payload += GW_MYSQL_SCRAMBLE_SIZE;
|
|
}
|
|
else
|
|
{
|
|
/** skip the auth-length and leave the byte as NULL */
|
|
payload++;
|
|
}
|
|
/** if the db is not NULL append it */
|
|
if (curr_db != NULL)
|
|
{
|
|
memcpy(payload, curr_db, strlen(curr_db));
|
|
payload += strlen(curr_db);
|
|
}
|
|
payload++;
|
|
/** set the charset, 2 bytes */
|
|
*payload = charset;
|
|
payload++;
|
|
*payload = '\x00';
|
|
payload++;
|
|
memcpy(payload, "mysql_native_password", strlen("mysql_native_password"));
|
|
/*
|
|
* Following needed if more to be added
|
|
* payload += strlen("mysql_native_password");
|
|
** put here the paylod size: bytes to write - 4 bytes packet header
|
|
*/
|
|
gw_mysql_set_byte3(payload_start, (bytes - 4));
|
|
|
|
return buffer;
|
|
}
|
|
|
|
/**
|
|
* Write a MySQL CHANGE_USER packet to backend server
|
|
*
|
|
* @param conn MySQL protocol structure
|
|
* @param dbname The selected database
|
|
* @param user The selected user
|
|
* @param passwd The SHA1(real_password)
|
|
* @return 1 on success, 0 on failure
|
|
*/
|
|
static int gw_send_change_user_to_backend(char* dbname,
|
|
char* user,
|
|
uint8_t* passwd,
|
|
MySQLProtocol* conn)
|
|
{
|
|
GWBUF* buffer;
|
|
int rc;
|
|
MYSQL_session* mses;
|
|
|
|
mses = (MYSQL_session*)conn->owner_dcb->session->client_dcb->data;
|
|
buffer = gw_create_change_user_packet(mses, conn);
|
|
rc = conn->owner_dcb->func.write(conn->owner_dcb, buffer);
|
|
|
|
if (rc != 0)
|
|
{
|
|
conn->changing_user = true;
|
|
rc = 1;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Send proxy protocol header. See
|
|
* http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
|
|
* for more information. Currently only supports the text version (v1) of
|
|
* the protocol. Binary version may be added when the feature has been confirmed
|
|
* to work.
|
|
*
|
|
* @param backend_dcb The target dcb.
|
|
*/
|
|
static void gw_send_proxy_protocol_header(DCB* backend_dcb)
|
|
{
|
|
// TODO: Add support for chained proxies. Requires reading the client header.
|
|
|
|
const DCB* client_dcb = backend_dcb->session->client_dcb;
|
|
const int client_fd = client_dcb->fd;
|
|
const sa_family_t family = client_dcb->ip.ss_family;
|
|
const char* family_str = NULL;
|
|
|
|
struct sockaddr_storage sa_peer;
|
|
struct sockaddr_storage sa_local;
|
|
socklen_t sa_peer_len = sizeof(sa_peer);
|
|
socklen_t sa_local_len = sizeof(sa_local);
|
|
|
|
/* Fill in peer's socket address. */
|
|
if (getpeername(client_fd, (struct sockaddr*)&sa_peer, &sa_peer_len) == -1)
|
|
{
|
|
MXS_ERROR("'%s' failed on file descriptor '%d'.", "getpeername()", client_fd);
|
|
return;
|
|
}
|
|
|
|
/* Fill in this socket's local address. */
|
|
if (getsockname(client_fd, (struct sockaddr*)&sa_local, &sa_local_len) == -1)
|
|
{
|
|
MXS_ERROR("'%s' failed on file descriptor '%d'.", "getsockname()", client_fd);
|
|
return;
|
|
}
|
|
mxb_assert(sa_peer.ss_family == sa_local.ss_family);
|
|
|
|
char peer_ip[INET6_ADDRSTRLEN];
|
|
char maxscale_ip[INET6_ADDRSTRLEN];
|
|
in_port_t peer_port;
|
|
in_port_t maxscale_port;
|
|
|
|
if (!get_ip_string_and_port(&sa_peer, peer_ip, sizeof(peer_ip), &peer_port)
|
|
|| !get_ip_string_and_port(&sa_local, maxscale_ip, sizeof(maxscale_ip), &maxscale_port))
|
|
{
|
|
MXS_ERROR("Could not convert network address to string form.");
|
|
return;
|
|
}
|
|
|
|
switch (family)
|
|
{
|
|
case AF_INET:
|
|
family_str = "TCP4";
|
|
break;
|
|
|
|
case AF_INET6:
|
|
family_str = "TCP6";
|
|
break;
|
|
|
|
default:
|
|
family_str = "UNKNOWN";
|
|
break;
|
|
}
|
|
|
|
int rval;
|
|
char proxy_header[108]; // 108 is the worst-case length
|
|
if (family == AF_INET || family == AF_INET6)
|
|
{
|
|
rval = snprintf(proxy_header,
|
|
sizeof(proxy_header),
|
|
"PROXY %s %s %s %d %d\r\n",
|
|
family_str,
|
|
peer_ip,
|
|
maxscale_ip,
|
|
peer_port,
|
|
maxscale_port);
|
|
}
|
|
else
|
|
{
|
|
rval = snprintf(proxy_header, sizeof(proxy_header), "PROXY %s\r\n", family_str);
|
|
}
|
|
if (rval < 0 || rval >= (int)sizeof(proxy_header))
|
|
{
|
|
MXS_ERROR("Proxy header printing error, produced '%s'.", proxy_header);
|
|
return;
|
|
}
|
|
|
|
GWBUF* headerbuf = gwbuf_alloc_and_load(strlen(proxy_header), proxy_header);
|
|
if (headerbuf)
|
|
{
|
|
MXS_INFO("Sending proxy-protocol header '%s' to backend %s.",
|
|
proxy_header,
|
|
backend_dcb->server->name);
|
|
if (!dcb_write(backend_dcb, headerbuf))
|
|
{
|
|
gwbuf_free(headerbuf);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Read IP and port from socket address structure, return IP as string and port
|
|
* as host byte order integer.
|
|
*
|
|
* @param sa A sockaddr_storage containing either an IPv4 or v6 address
|
|
* @param ip Pointer to output array
|
|
* @param iplen Output array length
|
|
* @param port_out Port number output
|
|
*/
|
|
static bool get_ip_string_and_port(struct sockaddr_storage* sa,
|
|
char* ip,
|
|
int iplen,
|
|
in_port_t* port_out)
|
|
{
|
|
bool success = false;
|
|
in_port_t port;
|
|
|
|
switch (sa->ss_family)
|
|
{
|
|
case AF_INET:
|
|
{
|
|
struct sockaddr_in* sock_info = (struct sockaddr_in*)sa;
|
|
struct in_addr* addr = &(sock_info->sin_addr);
|
|
success = (inet_ntop(AF_INET, addr, ip, iplen) != NULL);
|
|
port = ntohs(sock_info->sin_port);
|
|
}
|
|
break;
|
|
|
|
case AF_INET6:
|
|
{
|
|
struct sockaddr_in6* sock_info = (struct sockaddr_in6*)sa;
|
|
struct in6_addr* addr = &(sock_info->sin6_addr);
|
|
success = (inet_ntop(AF_INET6, addr, ip, iplen) != NULL);
|
|
port = ntohs(sock_info->sin6_port);
|
|
}
|
|
break;
|
|
}
|
|
if (success)
|
|
{
|
|
*port_out = port;
|
|
}
|
|
return success;
|
|
}
|
|
|
|
static bool gw_connection_established(DCB* dcb)
|
|
{
|
|
MySQLProtocol* proto = (MySQLProtocol*)dcb->protocol;
|
|
return proto->protocol_auth_state == MXS_AUTH_STATE_COMPLETE
|
|
&& (proto->ignore_replies == 0)
|
|
&& !proto->stored_query;
|
|
}
|
|
|
|
json_t* gw_json_diagnostics(DCB* dcb)
|
|
{
|
|
MySQLProtocol* proto = static_cast<MySQLProtocol*>(dcb->protocol);
|
|
json_t* obj = json_object();
|
|
json_object_set_new(obj, "connection_id", json_integer(proto->thread_id));
|
|
return obj;
|
|
}
|