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mariadb/sql/sql_connect.cc
Marko Mäkelä 2719cc4925 Merge 10.11 into 11.4
2024-12-02 11:35:34 +02:00

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/*
Copyright (c) 2007, 2013, Oracle and/or its affiliates.
Copyright (c) 2008, 2020, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
*/
/*
Functions to autenticate and handle reqests for a connection
*/
#include "mariadb.h"
#include "mysqld.h"
#include "sql_priv.h"
#ifndef _WIN32
#include <netdb.h> // getservbyname, servent
#endif
#include "sql_audit.h"
#include "sql_connect.h"
#include "thread_cache.h"
#include "probes_mysql.h"
#include "sql_parse.h" // sql_command_flags,
// execute_init_command,
// do_command
#include "sql_db.h" // mysql_change_db
#include "hostname.h" // inc_host_errors, ip_to_hostname,
// reset_host_errors
#include "sql_callback.h"
#ifdef WITH_WSREP
#include "wsrep_trans_observer.h" /* wsrep open/close */
#include "wsrep_mysqld.h"
#endif /* WITH_WSREP */
#include "proxy_protocol.h"
#include <ssl_compat.h>
HASH global_user_stats, global_client_stats, global_table_stats;
HASH global_index_stats;
/* Protects the above global stats */
extern mysql_mutex_t LOCK_global_user_client_stats;
extern mysql_mutex_t LOCK_global_table_stats;
extern mysql_mutex_t LOCK_global_index_stats;
extern vio_keepalive_opts opt_vio_keepalive;
/*
Get structure for logging connection data for the current user
*/
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static HASH hash_user_connections;
int get_or_create_user_conn(THD *thd, const char *user,
const char *host,
const USER_RESOURCES *mqh)
{
int return_val= 0;
size_t temp_len, user_len;
char temp_user[USER_HOST_BUFF_SIZE];
struct user_conn *uc;
DBUG_ASSERT(user != 0);
DBUG_ASSERT(host != 0);
DBUG_ASSERT(thd->user_connect == 0);
user_len= strlen(user);
temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
mysql_mutex_lock(&LOCK_user_conn);
if (!(uc = (struct user_conn *) my_hash_search(&hash_user_connections,
(uchar*) temp_user, temp_len)))
{
/* First connection for user; Create a user connection object */
if (!(uc= ((struct user_conn*)
my_malloc(key_memory_user_conn,
sizeof(struct user_conn) + temp_len+1, MYF(MY_WME)))))
{
/* MY_WME ensures an error is set in THD. */
return_val= 1;
goto end;
}
uc->user=(char*) (uc+1);
memcpy(uc->user,temp_user,temp_len+1);
uc->host= uc->user + user_len + 1;
uc->len= (uint)temp_len;
uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
uc->reset_utime= thd->thr_create_utime;
if (my_hash_insert(&hash_user_connections, (uchar*) uc))
{
/* The only possible error is out of memory, MY_WME sets an error. */
my_free(uc);
return_val= 1;
goto end;
}
}
uc->user_resources= *mqh;
thd->user_connect=uc;
uc->connections++;
end:
mysql_mutex_unlock(&LOCK_user_conn);
return return_val;
}
/*
check if user has already too many connections
SYNOPSIS
check_for_max_user_connections()
thd Thread handle
uc User connect object
NOTES
If check fails, we decrease user connection count, which means one
shouldn't call decrease_user_connections() after this function.
RETURN
0 ok
1 error
*/
int check_for_max_user_connections(THD *thd, USER_CONN *uc)
{
int error= 1;
Host_errors errors;
DBUG_ENTER("check_for_max_user_connections");
mysql_mutex_lock(&LOCK_user_conn);
/* Root is not affected by the value of max_user_connections */
if (global_system_variables.max_user_connections &&
!uc->user_resources.user_conn &&
global_system_variables.max_user_connections < uc->connections &&
!(thd->security_ctx->master_access & PRIV_IGNORE_MAX_USER_CONNECTIONS))
{
my_error(ER_TOO_MANY_USER_CONNECTIONS, MYF(0), uc->user);
error=1;
errors.m_max_user_connection= 1;
goto end;
}
time_out_user_resource_limits(thd, uc);
if (uc->user_resources.user_conn &&
uc->user_resources.user_conn < uc->connections)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user,
"max_user_connections",
(long) uc->user_resources.user_conn);
error= 1;
errors.m_max_user_connection= 1;
goto end;
}
if (uc->user_resources.conn_per_hour &&
uc->user_resources.conn_per_hour <= uc->conn_per_hour)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user,
"max_connections_per_hour",
(long) uc->user_resources.conn_per_hour);
error=1;
errors.m_max_user_connection_per_hour= 1;
goto end;
}
uc->conn_per_hour++;
error= 0;
end:
if (unlikely(error))
{
uc->connections--; // no need for decrease_user_connections() here
/*
The thread may returned back to the pool and assigned to a user
that doesn't have a limit. Ensure the user is not using resources
of someone else.
*/
thd->user_connect= NULL;
}
mysql_mutex_unlock(&LOCK_user_conn);
if (unlikely(error))
{
inc_host_errors(thd->main_security_ctx.ip, &errors);
}
DBUG_RETURN(error);
}
/*
Decrease user connection count
SYNOPSIS
decrease_user_connections()
uc User connection object
NOTES
If there is a n user connection object for a connection
(which only happens if 'max_user_connections' is defined or
if someone has created a resource grant for a user), then
the connection count is always incremented on connect.
The user connect object is not freed if some users has
'max connections per hour' defined as we need to be able to hold
count over the lifetime of the connection.
*/
void decrease_user_connections(USER_CONN *uc)
{
DBUG_ENTER("decrease_user_connections");
mysql_mutex_lock(&LOCK_user_conn);
DBUG_ASSERT(uc->connections);
if (!--uc->connections && !mqh_used)
{
/* Last connection for user; Delete it */
(void) my_hash_delete(&hash_user_connections,(uchar*) uc);
}
mysql_mutex_unlock(&LOCK_user_conn);
DBUG_VOID_RETURN;
}
/*
Reset per-hour user resource limits when it has been more than
an hour since they were last checked
SYNOPSIS:
time_out_user_resource_limits()
thd Thread handler
uc User connection details
NOTE:
This assumes that the LOCK_user_conn mutex has been acquired, so it is
safe to test and modify members of the USER_CONN structure.
*/
void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
{
ulonglong check_time= thd->start_utime;
DBUG_ENTER("time_out_user_resource_limits");
/* If more than a hour since last check, reset resource checking */
if (check_time - uc->reset_utime >= 3600000000ULL)
{
uc->questions=0;
uc->updates=0;
uc->conn_per_hour=0;
uc->reset_utime= check_time;
}
DBUG_VOID_RETURN;
}
/*
Check if maximum queries per hour limit has been reached
returns 0 if OK.
*/
bool check_mqh(THD *thd, uint check_command)
{
bool error= 0;
USER_CONN *uc=thd->user_connect;
DBUG_ENTER("check_mqh");
DBUG_ASSERT(uc != 0);
mysql_mutex_lock(&LOCK_user_conn);
time_out_user_resource_limits(thd, uc);
/* Check that we have not done too many questions / hour */
if (uc->user_resources.questions &&
uc->questions++ >= uc->user_resources.questions)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user, "max_queries_per_hour",
(long) uc->user_resources.questions);
error=1;
goto end;
}
if (check_command < (uint) SQLCOM_END)
{
/* Check that we have not done too many updates / hour */
if (uc->user_resources.updates &&
(sql_command_flags[check_command] & CF_CHANGES_DATA) &&
uc->updates++ >= uc->user_resources.updates)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user, "max_updates_per_hour",
(long) uc->user_resources.updates);
error=1;
goto end;
}
}
end:
mysql_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/*
Check for maximum allowable user connections, if the mysqld server is
started with corresponding variable that is greater then 0.
*/
extern "C" const uchar *get_key_conn(const void *buff_, size_t *length,
my_bool)
{
auto buff= static_cast<const user_conn *>(buff_);
*length= buff->len;
return reinterpret_cast<const uchar *>(buff->user);
}
void init_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
my_hash_init(key_memory_user_conn, &hash_user_connections,
system_charset_info, max_connections, 0, 0, get_key_conn,
my_free, 0);
#endif
}
void free_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
my_hash_free(&hash_user_connections);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
void reset_mqh(LEX_USER *lu, bool get_them= 0)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
mysql_mutex_lock(&LOCK_user_conn);
if (lu) // for GRANT
{
USER_CONN *uc;
size_t temp_len=lu->user.length+lu->host.length+2;
char temp_user[USER_HOST_BUFF_SIZE];
memcpy(temp_user,lu->user.str,lu->user.length);
memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
if ((uc = (struct user_conn *) my_hash_search(&hash_user_connections,
(uchar*) temp_user,
temp_len)))
{
uc->questions=0;
get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
uc->updates=0;
uc->conn_per_hour=0;
}
}
else
{
/* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
for (uint idx=0;idx < hash_user_connections.records; idx++)
{
USER_CONN *uc=(struct user_conn *)
my_hash_element(&hash_user_connections, idx);
if (get_them)
get_mqh(uc->user,uc->host,uc);
uc->questions=0;
uc->updates=0;
uc->conn_per_hour=0;
}
}
mysql_mutex_unlock(&LOCK_user_conn);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*****************************************************************************
Handle users statistics
*****************************************************************************/
/* 'mysql_system_user' is used for when the user is not defined for a THD. */
static const char mysql_system_user[]= "#mysql_system#";
// Returns 'user' if it's not NULL. Returns 'mysql_system_user' otherwise.
static const char * get_valid_user_string(const char* user)
{
return user ? user : mysql_system_user;
}
/*
Returns string as 'IP' for the client-side of the connection represented by
'client'. Does not allocate memory. May return "".
*/
static const char *get_client_host(THD *client)
{
return client->security_ctx->host_or_ip[0] ?
client->security_ctx->host_or_ip :
client->security_ctx->host ? client->security_ctx->host : "";
}
extern "C" const uchar *get_key_user_stats(const void *user_stats_,
size_t *length, my_bool)
{
auto user_stats= static_cast<const USER_STATS *>(user_stats_);
*length= user_stats->user_name_length;
return reinterpret_cast<const uchar *>(user_stats->user);
}
void init_user_stats(USER_STATS *user_stats,
const char *user,
size_t user_length,
const char *priv_user,
uint total_connections,
uint total_ssl_connections,
uint concurrent_connections,
time_t connected_time,
double busy_time,
double cpu_time,
ulonglong bytes_received,
ulonglong bytes_sent,
ulonglong binlog_bytes_written,
ha_rows rows_sent,
ha_rows rows_read,
ha_rows rows_inserted,
ha_rows rows_deleted,
ha_rows rows_updated,
ulonglong select_commands,
ulonglong update_commands,
ulonglong other_commands,
ulonglong commit_trans,
ulonglong rollback_trans,
ulonglong denied_connections,
ulonglong lost_connections,
ulonglong max_statement_time_exceeded,
ulonglong access_denied_errors,
ulonglong empty_queries)
{
DBUG_ENTER("init_user_stats");
DBUG_PRINT("enter", ("user: %s priv_user: %s", user, priv_user));
user_length= MY_MIN(user_length, sizeof(user_stats->user)-1);
memcpy(user_stats->user, user, user_length);
user_stats->user[user_length]= 0;
user_stats->user_name_length= (uint)user_length;
strmake_buf(user_stats->priv_user, priv_user);
user_stats->total_connections= total_connections;
user_stats->total_ssl_connections= total_ssl_connections;
user_stats->concurrent_connections= concurrent_connections;
user_stats->connected_time= connected_time;
user_stats->busy_time= busy_time;
user_stats->cpu_time= cpu_time;
user_stats->bytes_received= bytes_received;
user_stats->bytes_sent= bytes_sent;
user_stats->binlog_bytes_written= binlog_bytes_written;
user_stats->rows_sent= rows_sent;
user_stats->rows_read= rows_read;
user_stats->rows_inserted= rows_inserted;
user_stats->rows_deleted= rows_deleted;
user_stats->rows_updated= rows_updated;
user_stats->select_commands= select_commands;
user_stats->update_commands= update_commands;
user_stats->other_commands= other_commands;
user_stats->commit_trans= commit_trans;
user_stats->rollback_trans= rollback_trans;
user_stats->denied_connections= denied_connections;
user_stats->lost_connections= lost_connections;
user_stats->max_statement_time_exceeded= max_statement_time_exceeded;
user_stats->access_denied_errors= access_denied_errors;
user_stats->empty_queries= empty_queries;
DBUG_VOID_RETURN;
}
void init_global_user_stats(void)
{
my_hash_init(PSI_INSTRUMENT_ME, &global_user_stats, system_charset_info,
max_connections, 0, 0, get_key_user_stats, my_free, 0);
}
void init_global_client_stats(void)
{
my_hash_init(PSI_INSTRUMENT_ME, &global_client_stats, system_charset_info,
max_connections, 0, 0, get_key_user_stats, my_free, 0);
}
extern "C" const uchar *get_key_table_stats(const void *table_stats_,
size_t *length, my_bool)
{
auto table_stats= static_cast<const TABLE_STATS *>(table_stats_);
*length= table_stats->table_name_length;
return reinterpret_cast<const uchar *>(table_stats->table);
}
void init_global_table_stats(void)
{
my_hash_init(PSI_INSTRUMENT_ME, &global_table_stats,
Lex_ident_fs::charset_info(), max_connections, 0, 0,
get_key_table_stats, my_free, 0);
}
extern "C" const uchar *get_key_index_stats(const void *index_stats_,
size_t *length, my_bool)
{
auto index_stats= static_cast<const INDEX_STATS *>(index_stats_);
*length= index_stats->index_name_length;
return reinterpret_cast<const uchar *>(index_stats->index);
}
void init_global_index_stats(void)
{
my_hash_init(PSI_INSTRUMENT_ME, &global_index_stats,
Lex_ident_fs::charset_info(), max_connections, 0, 0,
get_key_index_stats, my_free, 0);
}
void free_global_user_stats(void)
{
my_hash_free(&global_user_stats);
}
void free_global_table_stats(void)
{
my_hash_free(&global_table_stats);
}
void free_global_index_stats(void)
{
my_hash_free(&global_index_stats);
}
void free_global_client_stats(void)
{
my_hash_free(&global_client_stats);
}
/*
Increments the global stats connection count for an entry from
global_client_stats or global_user_stats. Returns 0 on success
and 1 on error.
*/
static bool increment_count_by_name(const char *name, size_t name_length,
const char *role_name,
HASH *users_or_clients, THD *thd)
{
USER_STATS *user_stats;
if (!(user_stats= (USER_STATS*) my_hash_search(users_or_clients, (uchar*) name,
name_length)))
{
/* First connection for this user or client */
if (!(user_stats= ((USER_STATS*)
my_malloc(PSI_INSTRUMENT_ME, sizeof(USER_STATS),
MYF(MY_WME | MY_ZEROFILL)))))
return TRUE; // Out of memory
init_user_stats(user_stats, name, name_length, role_name,
0, 0, 0, // connections
0, 0, 0, // time
0, 0, 0, // bytes sent, received and written
0, 0, // rows sent and read
0, 0, 0, // rows inserted, deleted and updated
0, 0, 0, // select, update and other commands
0, 0, // commit and rollback trans
thd->status_var.access_denied_errors,
0, // lost connections
0, // max query timeouts
0, // access denied errors
0); // empty queries
if (my_hash_insert(users_or_clients, (uchar*)user_stats))
{
my_free(user_stats);
return TRUE; // Out of memory
}
}
user_stats->total_connections++;
if (thd->net.vio && thd->net.vio->type == VIO_TYPE_SSL)
user_stats->total_ssl_connections++;
return FALSE;
}
/*
Increments the global user and client stats connection count.
@param use_lock if true, LOCK_global_user_client_stats will be locked
@retval 0 ok
@retval 1 error.
*/
#ifndef EMBEDDED_LIBRARY
static bool increment_connection_count(THD* thd, bool use_lock)
{
const char *user_string= get_valid_user_string(thd->main_security_ctx.user);
const char *client_string= get_client_host(thd);
bool return_value= FALSE;
if (!thd->userstat_running)
return FALSE;
if (use_lock)
mysql_mutex_lock(&LOCK_global_user_client_stats);
if (increment_count_by_name(user_string, strlen(user_string), user_string,
&global_user_stats, thd))
{
return_value= TRUE;
goto end;
}
if (increment_count_by_name(client_string, strlen(client_string),
user_string, &global_client_stats, thd))
{
return_value= TRUE;
goto end;
}
end:
if (use_lock)
mysql_mutex_unlock(&LOCK_global_user_client_stats);
return return_value;
}
#endif
/*
Used to update the global user and client stats
*/
static void update_global_user_stats_with_user(THD *thd,
USER_STATS *user_stats,
time_t now)
{
DBUG_ASSERT(thd->userstat_running);
user_stats->connected_time+= now - thd->last_global_update_time;
user_stats->busy_time+= (thd->status_var.busy_time -
thd->org_status_var.busy_time);
user_stats->cpu_time+= (thd->status_var.cpu_time -
thd->org_status_var.cpu_time);
/*
This is handle specially as bytes_received is incremented BEFORE
org_status_var is copied.
*/
user_stats->bytes_received+= (thd->org_status_var.bytes_received-
thd->start_bytes_received);
user_stats->bytes_sent+= (thd->status_var.bytes_sent -
thd->org_status_var.bytes_sent);
user_stats->binlog_bytes_written+=
(thd->status_var.binlog_bytes_written -
thd->org_status_var.binlog_bytes_written);
/* We are not counting rows in internal temporary tables here ! */
user_stats->rows_read+= (thd->status_var.rows_read -
thd->org_status_var.rows_read);
user_stats->rows_sent+= (thd->status_var.rows_sent -
thd->org_status_var.rows_sent);
user_stats->rows_inserted+= (thd->status_var.ha_write_count -
thd->org_status_var.ha_write_count);
user_stats->rows_deleted+= (thd->status_var.ha_delete_count -
thd->org_status_var.ha_delete_count);
user_stats->rows_updated+= (thd->status_var.ha_update_count -
thd->org_status_var.ha_update_count);
user_stats->select_commands+= thd->select_commands;
user_stats->update_commands+= thd->update_commands;
user_stats->other_commands+= thd->other_commands;
user_stats->commit_trans+= (thd->status_var.ha_commit_count -
thd->org_status_var.ha_commit_count);
user_stats->rollback_trans+= (thd->status_var.ha_rollback_count +
thd->status_var.ha_savepoint_rollback_count -
thd->org_status_var.ha_rollback_count -
thd->org_status_var.
ha_savepoint_rollback_count);
user_stats->access_denied_errors+=
(thd->status_var.access_denied_errors -
thd->org_status_var.access_denied_errors);
user_stats->empty_queries+= (thd->status_var.empty_queries -
thd->org_status_var.empty_queries);
/* The following can only contain 0 or 1 and then connection ends */
user_stats->denied_connections+= thd->status_var.access_denied_errors;
user_stats->lost_connections+= thd->status_var.lost_connections;
user_stats->max_statement_time_exceeded+= thd->status_var.max_statement_time_exceeded;
}
/* Updates the global stats of a user or client */
void update_global_user_stats(THD *thd, bool create_user, time_t now)
{
const char *user_string, *client_string;
USER_STATS *user_stats;
size_t user_string_length, client_string_length;
DBUG_ASSERT(thd->userstat_running);
user_string= get_valid_user_string(thd->main_security_ctx.user);
user_string_length= strlen(user_string);
client_string= get_client_host(thd);
client_string_length= strlen(client_string);
mysql_mutex_lock(&LOCK_global_user_client_stats);
// Update by user name
if ((user_stats= (USER_STATS*) my_hash_search(&global_user_stats,
(uchar*) user_string,
user_string_length)))
{
/* Found user. */
update_global_user_stats_with_user(thd, user_stats, now);
}
else
{
/* Create the entry */
if (create_user)
{
increment_count_by_name(user_string, user_string_length, user_string,
&global_user_stats, thd);
}
}
/* Update by client IP */
if ((user_stats= (USER_STATS*)my_hash_search(&global_client_stats,
(uchar*) client_string,
client_string_length)))
{
// Found by client IP
update_global_user_stats_with_user(thd, user_stats, now);
}
else
{
// Create the entry
if (create_user)
{
increment_count_by_name(client_string, client_string_length,
user_string, &global_client_stats, thd);
}
}
/* Reset variables only used for counting */
thd->select_commands= thd->update_commands= thd->other_commands= 0;
thd->last_global_update_time= now;
mysql_mutex_unlock(&LOCK_global_user_client_stats);
}
/**
Set thread character set variables from the given ID
@param thd thread handle
@param cs_number character set and collation ID
@retval 0 OK; character_set_client, collation_connection and
character_set_results are set to the new value,
or to the default global values.
@retval 1 error, e.g. the given ID is not supported by parser.
Corresponding SQL error is sent.
*/
bool thd_init_client_charset(THD *thd, uint cs_number)
{
CHARSET_INFO *cs;
// Test a non-default collation ID. See also comments in this function below.
DBUG_EXECUTE_IF("thd_init_client_charset_utf8mb3_bin", cs_number= 83;);
/*
Use server character set and collation if
- opt_character_set_client_handshake is not set
- client has not specified a character set
- client character set doesn't exists in server
*/
if (!opt_character_set_client_handshake ||
!(cs= get_charset(cs_number, MYF(0))))
{
thd->update_charset(global_system_variables.character_set_client,
global_system_variables.collation_connection,
global_system_variables.character_set_results);
}
else
{
if (!is_supported_parser_charset(cs))
{
/* Disallow non-supported parser character sets: UCS2, UTF16, UTF32 */
my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), "character_set_client",
cs->cs_name.str);
return true;
}
/*
Some connectors (e.g. JDBC, Node.js) can send non-default collation IDs
in the handshake packet, to set @@collation_connection right during
handshake. Although this is a non-documenting feature,
for better backward compatibility with such connectors let's:
a. resolve only default collations according to @@character_set_collations
b. preserve non-default collations as is
Perhaps eventually we should change (b) also to resolve non-default
collations accoding to @@character_set_collations. Clients that used to
send a non-default collation ID in the handshake packet will have to set
@@character_set_collations instead.
*/
if (cs->state & MY_CS_PRIMARY)
{
Sql_used used;
cs= global_system_variables.character_set_collations.
get_collation_for_charset(&used, cs);
}
thd->org_charset= cs;
thd->update_charset(cs,cs,cs);
}
return false;
}
/*
Initialize connection threads
*/
#ifndef EMBEDDED_LIBRARY
bool init_new_connection_handler_thread()
{
pthread_detach_this_thread();
if (my_thread_init())
{
statistic_increment(aborted_connects,&LOCK_status);
statistic_increment(connection_errors_internal, &LOCK_status);
return 1;
}
DBUG_EXECUTE_IF("simulate_failed_connection_1", return(1); );
return 0;
}
/**
Set client address during authentication.
Initializes THD::main_security_ctx and THD::peer_port.
Optionally does ip to hostname translation.
@param thd current THD handle
@param addr peer address (can be NULL, if 'ip' is set)
@param ip peer address as string (can be NULL if 'addr' is set)
@param port peer port
@param check_proxy_networks if true, and host is in
'proxy_protocol_networks' list, skip
"host not privileged" check
@param[out] host_errors - number of connect
errors for this host
@retval 0 ok, 1 error
*/
int thd_set_peer_addr(THD *thd,
sockaddr_storage *addr,
const char *ip,
uint port,
bool check_proxy_networks,
uint *host_errors)
{
*host_errors= 0;
thd->peer_port= port;
char ip_string[128];
if (!ip)
{
void *addr_data;
if (addr->ss_family == AF_UNIX)
{
/* local connection */
my_free((void *)thd->main_security_ctx.ip);
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host = my_localhost;
thd->main_security_ctx.ip= 0;
return 0;
}
else if (addr->ss_family == AF_INET)
addr_data= &((struct sockaddr_in *)addr)->sin_addr;
else
addr_data= &((struct sockaddr_in6 *)addr)->sin6_addr;
if (!inet_ntop(addr->ss_family,addr_data, ip_string, sizeof(ip_string)))
{
DBUG_ASSERT(0);
return 1;
}
ip= ip_string;
}
my_free((void *)thd->main_security_ctx.ip);
if (!(thd->main_security_ctx.ip = my_strdup(PSI_INSTRUMENT_ME, ip, MYF(MY_WME))))
{
/*
No error accounting per IP in host_cache,
this is treated as a global server OOM error.
TODO: remove the need for my_strdup.
*/
statistic_increment(aborted_connects, &LOCK_status);
statistic_increment(connection_errors_internal, &LOCK_status);
return 1; /* The error is set by my_strdup(). */
}
thd->main_security_ctx.host_or_ip = thd->main_security_ctx.ip;
if (!opt_skip_name_resolve)
{
int rc;
rc = ip_to_hostname(addr,
thd->main_security_ctx.ip,
&thd->main_security_ctx.host,
host_errors);
/* Cut very long hostnames to avoid possible overflows */
if (thd->main_security_ctx.host)
{
if (thd->main_security_ctx.host != my_localhost)
((char*)thd->main_security_ctx.host)[MY_MIN(strlen(thd->main_security_ctx.host),
HOSTNAME_LENGTH)] = 0;
thd->main_security_ctx.host_or_ip = thd->main_security_ctx.host;
}
if (rc == RC_BLOCKED_HOST)
{
/* HOST_CACHE stats updated by ip_to_hostname(). */
my_error(ER_HOST_IS_BLOCKED, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
}
DBUG_PRINT("info", ("Host: %s ip: %s",
(thd->main_security_ctx.host ?
thd->main_security_ctx.host : "unknown host"),
(thd->main_security_ctx.ip ?
thd->main_security_ctx.ip : "unknown ip")));
if ((!check_proxy_networks || !is_proxy_protocol_allowed((struct sockaddr *) addr))
&& acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
{
/* HOST_CACHE stats updated by acl_check_host(). */
my_error(ER_HOST_NOT_PRIVILEGED, MYF(0),
thd->main_security_ctx.host_or_ip);
return 1;
}
return 0;
}
/*
Perform handshake, authorize client and update thd ACL variables.
SYNOPSIS
check_connection()
thd thread handle
RETURN
0 success, thd is updated.
1 error
*/
static int check_connection(THD *thd)
{
uint connect_errors= 0;
int auth_rc;
NET *net= &thd->net;
DBUG_PRINT("info",
("New connection received on %s", vio_description(net->vio)));
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->set_active_vio(net->vio);
#endif
if (!thd->main_security_ctx.host) // If TCP/IP connection
{
my_bool peer_rc;
char ip[NI_MAXHOST];
uint16 peer_port;
peer_rc= vio_peer_addr(net->vio, ip, &peer_port, NI_MAXHOST);
/*
===========================================================================
DEBUG code only (begin)
Simulate various output from vio_peer_addr().
===========================================================================
*/
DBUG_EXECUTE_IF("vio_peer_addr_error",
{
peer_rc= 1;
}
);
DBUG_EXECUTE_IF("vio_peer_addr_fake_ipv4",
{
struct sockaddr *sa= (sockaddr *) &net->vio->remote;
sa->sa_family= AF_INET;
struct in_addr *ip4= &((struct sockaddr_in *) sa)->sin_addr;
/* See RFC 5737, 192.0.2.0/24 is reserved. */
const char* fake= "192.0.2.4";
inet_pton(AF_INET,fake, ip4);
safe_strcpy(ip, sizeof(ip), fake);
peer_rc= 0;
}
);
#ifdef HAVE_IPV6
DBUG_EXECUTE_IF("vio_peer_addr_fake_ipv6",
{
struct sockaddr_in6 *sa= (sockaddr_in6 *) &net->vio->remote;
sa->sin6_family= AF_INET6;
struct in6_addr *ip6= & sa->sin6_addr;
/* See RFC 3849, ipv6 2001:DB8::/32 is reserved. */
const char* fake= "2001:db8::6:6";
/* inet_pton(AF_INET6, fake, ip6); not available on Windows XP. */
ip6->s6_addr[ 0] = 0x20;
ip6->s6_addr[ 1] = 0x01;
ip6->s6_addr[ 2] = 0x0d;
ip6->s6_addr[ 3] = 0xb8;
ip6->s6_addr[ 4] = 0x00;
ip6->s6_addr[ 5] = 0x00;
ip6->s6_addr[ 6] = 0x00;
ip6->s6_addr[ 7] = 0x00;
ip6->s6_addr[ 8] = 0x00;
ip6->s6_addr[ 9] = 0x00;
ip6->s6_addr[10] = 0x00;
ip6->s6_addr[11] = 0x00;
ip6->s6_addr[12] = 0x00;
ip6->s6_addr[13] = 0x06;
ip6->s6_addr[14] = 0x00;
ip6->s6_addr[15] = 0x06;
safe_strcpy(ip, sizeof(ip), fake);
peer_rc= 0;
}
);
#endif /* HAVE_IPV6 */
/*
===========================================================================
DEBUG code only (end)
===========================================================================
*/
if (peer_rc)
{
/*
Since we can not even get the peer IP address,
there is nothing to show in the host_cache,
so increment the global status variable for peer address errors.
*/
statistic_increment(connection_errors_peer_addr, &LOCK_status);
my_error(ER_BAD_HOST_ERROR, MYF(0));
statistic_increment(aborted_connects_preauth, &LOCK_status);
return 1;
}
if (thd_set_peer_addr(thd, &net->vio->remote, ip, peer_port,
true, &connect_errors))
{
statistic_increment(aborted_connects_preauth, &LOCK_status);
return 1;
}
}
else /* Hostname given means that the connection was on a socket */
{
DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
thd->main_security_ctx.ip= 0;
/* Reset sin_addr */
bzero((char*) &net->vio->remote, sizeof(net->vio->remote));
}
vio_keepalive(net->vio, TRUE);
vio_set_keepalive_options(net->vio, &opt_vio_keepalive);
if (unlikely(thd->packet.alloc(thd->variables.net_buffer_length)))
{
/*
Important note:
net_buffer_length is a SESSION variable,
so it may be tempting to account OOM conditions per IP in the HOST_CACHE,
in case some clients are more demanding than others ...
However, this session variable is *not* initialized with a per client
value during the initial connection, it is initialized from the
GLOBAL net_buffer_length variable from the server.
Hence, there is no reason to account on OOM conditions per client IP,
we count failures in the global server status instead.
*/
statistic_increment(aborted_connects,&LOCK_status);
statistic_increment(connection_errors_internal, &LOCK_status);
statistic_increment(aborted_connects_preauth, &LOCK_status);
return 1; /* The error is set by alloc(). */
}
auth_rc= acl_authenticate(thd, 0);
if (auth_rc == 0 && connect_errors != 0)
{
/*
A client connection from this IP was successful,
after some previous failures.
Reset the connection error counter.
*/
reset_host_connect_errors(thd->main_security_ctx.ip);
}
return auth_rc;
}
/*
Setup thread to be used with the current thread
SYNOPSIS
bool setup_connection_thread_globals()
thd Thread/connection handler
RETURN
0 ok
1 Error (out of memory)
In this case we will close the connection and increment status
*/
void setup_connection_thread_globals(THD *thd)
{
DBUG_EXECUTE_IF("CONNECT_wait", {
extern Dynamic_array<MYSQL_SOCKET> listen_sockets;
while (listen_sockets.size())
my_sleep(1000);
});
thd->store_globals();
}
/*
Autenticate user, with error reporting
SYNOPSIS
login_connection()
thd Thread handler
NOTES
Connection is not closed in case of errors
RETURN
0 ok
1 error
*/
static bool login_connection(THD *thd)
{
NET *net= &thd->net;
int error= 0;
DBUG_ENTER("login_connection");
DBUG_PRINT("info", ("login_connection called by thread %lu",
(ulong) thd->thread_id));
/* Use "connect_timeout" value during connection phase */
my_net_set_read_timeout(net, connect_timeout);
my_net_set_write_timeout(net, connect_timeout);
error= check_connection(thd);
thd->protocol->end_statement();
if (unlikely(error))
{ // Wrong permissions
#ifdef _WIN32
if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
my_sleep(1000); /* must wait after eof() */
#endif
statistic_increment(aborted_connects,&LOCK_status);
error=1;
goto exit;
}
/* Connect completed, set read/write timeouts back to default */
my_net_set_read_timeout(net, thd->variables.net_read_timeout);
my_net_set_write_timeout(net, thd->variables.net_write_timeout);
/* Updates global user connection stats. */
if (increment_connection_count(thd, TRUE))
{
my_error(ER_OUTOFMEMORY, MYF(0), (int) (2*sizeof(USER_STATS)));
error= 1;
goto exit;
}
exit:
mysql_audit_notify_connection_connect(thd);
DBUG_RETURN(error);
}
/*
Close an established connection
NOTES
This mainly updates status variables
*/
void end_connection(THD *thd)
{
NET *net= &thd->net;
#ifdef WITH_WSREP
if (thd->wsrep_cs().state() == wsrep::client_state::s_exec)
{
/* Error happened after the thread acquired ownership to wsrep
client state, but before command was processed. Clean up the
state before wsrep_close(). */
wsrep_after_command_ignore_result(thd);
}
wsrep_close(thd);
#endif /* WITH_WSREP */
if (thd->user_connect)
{
/*
We decrease this variable early to make it easy to log again quickly.
This code is not critical as we will in any case do this test
again in thd->cleanup()
*/
decrease_user_connections(thd->user_connect);
/*
The thread may returned back to the pool and assigned to a user
that doesn't have a limit. Ensure the user is not using resources
of someone else.
*/
thd->user_connect= NULL;
}
if (unlikely(thd->killed) || (net->error && net->vio != 0))
{
statistic_increment(aborted_threads,&LOCK_status);
status_var_increment(thd->status_var.lost_connections);
}
if (likely(!thd->killed) && (net->error && net->vio != 0))
thd->print_aborted_warning(1, thd->get_stmt_da()->is_error()
? thd->get_stmt_da()->message() : ER_THD(thd, ER_UNKNOWN_ERROR));
}
/*
Initialize THD to handle queries
*/
void prepare_new_connection_state(THD* thd)
{
Security_context *sctx= thd->security_ctx;
if (thd->client_capabilities & CLIENT_COMPRESS)
thd->net.compress=1; // Use compression
/*
Much of this is duplicated in create_embedded_thd() for the
embedded server library.
TODO: refactor this to avoid code duplication there
*/
thd->mark_connection_idle();
thd->init_for_queries();
if (opt_init_connect.length &&
!(sctx->master_access & PRIV_IGNORE_INIT_CONNECT))
{
execute_init_command(thd, &opt_init_connect, &LOCK_sys_init_connect);
if (unlikely(thd->is_error()))
{
Host_errors errors;
thd->set_killed(KILL_CONNECTION);
thd->print_aborted_warning(0, "init_connect command failed");
sql_print_warning("%s", thd->get_stmt_da()->message());
/*
now let client to send its first command,
to be able to send the error back
*/
NET *net= &thd->net;
thd->lex->current_select= 0;
my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
thd->clear_error();
net_new_transaction(net);
ulong packet_length= my_net_read(net);
/*
If my_net_read() failed, my_error() has been already called,
and the main Diagnostics Area contains an error condition.
*/
if (packet_length != packet_error)
my_error(ER_NEW_ABORTING_CONNECTION,
(thd->db.str || sctx->user) ? MYF(0) : MYF(ME_WARNING),
thd->thread_id,
thd->db.str ? thd->db.str : "unconnected",
sctx->user ? sctx->user : "unauthenticated",
sctx->host_or_ip, "", "init_connect command failed");
thd->server_status&= ~SERVER_STATUS_CLEAR_SET;
thd->protocol->end_statement();
thd->killed = KILL_CONNECTION;
errors.m_init_connect= 1;
inc_host_errors(thd->main_security_ctx.ip, &errors);
return;
}
thd->proc_info=0;
}
}
/*
Thread handler for a connection
SYNOPSIS
handle_one_connection()
arg Connection object (THD)
IMPLEMENTATION
This function (normally) does the following:
- Initialize thread
- Initialize THD to be used with this thread
- Authenticate user
- Execute all queries sent on the connection
- Take connection down
- End thread / Handle next connection using thread from thread cache
*/
pthread_handler_t handle_one_connection(void *arg)
{
CONNECT *connect= (CONNECT*) arg;
mysql_thread_set_psi_id(connect->thread_id);
if (init_new_connection_handler_thread())
connect->close_with_error(0, 0, ER_OUT_OF_RESOURCES);
else
do_handle_one_connection(connect, true);
DBUG_PRINT("info", ("killing thread"));
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
ERR_remove_state(0);
#endif
my_thread_end();
return 0;
}
bool thd_prepare_connection(THD *thd)
{
bool rc;
lex_start(thd);
rc= login_connection(thd);
if (rc)
return rc;
MYSQL_CONNECTION_START(thd->thread_id, &thd->security_ctx->priv_user[0],
(char *) thd->security_ctx->host_or_ip);
prepare_new_connection_state(thd);
#ifdef WITH_WSREP
thd->wsrep_client_thread= true;
wsrep_open(thd);
#endif /* WITH_WSREP */
return FALSE;
}
bool thd_is_connection_alive(THD *thd)
{
NET *net= &thd->net;
if (likely(!net->error &&
net->vio != 0 &&
thd->killed < KILL_CONNECTION))
return TRUE;
return FALSE;
}
void do_handle_one_connection(CONNECT *connect, bool put_in_cache)
{
ulonglong thr_create_utime= microsecond_interval_timer();
THD *thd;
if (!(thd= connect->create_thd(NULL)))
{
connect->close_and_delete(0);
return;
}
/*
If a thread was created to handle this connection:
increment slow_launch_threads counter if it took more than
slow_launch_time seconds to create the thread.
*/
if (connect->prior_thr_create_utime)
{
ulong launch_time= (ulong) (thr_create_utime -
connect->prior_thr_create_utime);
if (launch_time >= slow_launch_time*1000000L)
statistic_increment(slow_launch_threads, &LOCK_status);
}
server_threads.insert(thd); // Make THD visible in show processlist
delete connect; // must be after server_threads.insert, see close_connections()
thd->thr_create_utime= thr_create_utime;
/* We need to set this because of time_out_user_resource_limits */
thd->start_utime= thr_create_utime;
setup_connection_thread_globals(thd);
for (;;)
{
bool create_user= TRUE;
mysql_socket_set_thread_owner(thd->net.vio->mysql_socket);
if (thd_prepare_connection(thd))
{
create_user= FALSE;
goto end_thread;
}
while (thd_is_connection_alive(thd))
{
if (mysql_audit_release_required(thd))
mysql_audit_release(thd);
if (do_command(thd))
break;
}
end_connection(thd);
end_thread:
close_connection(thd);
if (thd->userstat_running)
update_global_user_stats(thd, create_user, time(NULL));
unlink_thd(thd);
if (IF_WSREP(thd->wsrep_applier, false) || !put_in_cache ||
!(connect= thread_cache.park()))
break;
/* Create new instrumentation for the new THD job */
PSI_CALL_set_thread(PSI_CALL_new_thread(key_thread_one_connection, thd,
thd->thread_id));
if (!(connect->create_thd(thd)))
{
/* Out of resources. Free thread to get more resources */
connect->close_and_delete(0);
break;
}
delete connect;
/*
We have to call store_globals to update mysys_var->id and lock_info
with the new thread_id
*/
thd->store_globals();
/* reset abort flag for the thread */
thd->mysys_var->abort= 0;
thd->thr_create_utime= microsecond_interval_timer();
thd->start_utime= thd->thr_create_utime;
server_threads.insert(thd);
}
delete thd;
}
#endif /* EMBEDDED_LIBRARY */
/* Handling of CONNECT objects */
/*
Close connection without error and delete the connect object
This and close_with_error are only called if we didn't manage to
create a new thd object.
Note: err can be 0 if unknown/not inportant
*/
void CONNECT::close_and_delete(uint err)
{
DBUG_ENTER("close_and_delete");
#if _WIN32
if (vio_type == VIO_TYPE_NAMEDPIPE)
CloseHandle(pipe);
else
#endif
if (vio_type != VIO_CLOSED)
mysql_socket_close(sock);
vio_type= VIO_CLOSED;
--*scheduler->connection_count;
if (err == ER_CON_COUNT_ERROR)
statistic_increment(connection_errors_max_connection, &LOCK_status);
else
statistic_increment(connection_errors_internal, &LOCK_status);
statistic_increment(aborted_connects,&LOCK_status);
delete this;
DBUG_VOID_RETURN;
}
/*
Close a connection with a possible error to the end user
Alse deletes the connection object, like close_and_delete()
*/
void CONNECT::close_with_error(uint sql_errno,
const char *message, uint close_error)
{
THD *thd= create_thd(NULL);
if (thd)
{
if (sql_errno)
thd->protocol->net_send_error(thd, sql_errno, message, NULL);
close_connection(thd, close_error);
delete thd;
set_current_thd(0);
}
close_and_delete(close_error);
}
/* Reuse or create a THD based on a CONNECT object */
THD *CONNECT::create_thd(THD *thd)
{
bool res, thd_reused= thd != 0;
Vio *vio;
DBUG_ENTER("create_thd");
DBUG_EXECUTE_IF("simulate_failed_connection_2", DBUG_RETURN(0); );
if (thd)
{
/* reuse old thd */
thd->reset_for_reuse();
/*
reset tread_id's, but not thread_dbug_id's as the later isn't allowed
to change as there is already structures in thd marked with the old
value.
*/
thd->thread_id= thd->variables.pseudo_thread_id= thread_id;
}
else if (!(thd= new THD(thread_id)))
DBUG_RETURN(0);
#if _WIN32
if (vio_type == VIO_TYPE_NAMEDPIPE)
vio= vio_new_win32pipe(pipe);
else
#endif
vio= mysql_socket_vio_new(sock, vio_type, vio_type == VIO_TYPE_SOCKET ?
VIO_LOCALHOST : 0);
if (!vio)
{
if (!thd_reused)
delete thd;
DBUG_RETURN(0);
}
set_current_thd(thd);
res= my_net_init(&thd->net, vio, thd, MYF(MY_THREAD_SPECIFIC));
vio_type= VIO_CLOSED; // Vio now handled by thd
if (unlikely(res || thd->is_error()))
{
if (!thd_reused)
delete thd;
set_current_thd(0);
DBUG_RETURN(0);
}
init_net_server_extension(thd);
thd->security_ctx->host= thd->net.vio->type == VIO_TYPE_NAMEDPIPE ||
thd->net.vio->type == VIO_TYPE_SOCKET ?
my_localhost : 0;
thd->scheduler= scheduler;
thd->real_id= pthread_self(); /* Duplicates THD::store_globals() setting. */
/* Attach PSI instrumentation to the new THD */
PSI_thread *psi= PSI_CALL_get_thread();
PSI_CALL_set_thread_os_id(psi);
PSI_CALL_set_thread_THD(psi, thd);
PSI_CALL_set_thread_id(psi, thd->thread_id);
thd->set_psi(psi);
DBUG_RETURN(thd);
}
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