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sql_user_table.cc
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/* Copyright (c) 2000, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 02110-1301 USA */
#include "sql/auth/sql_user_table.h"
#include "my_config.h"
#include <stddef.h>
#include <string.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <memory>
#include <set>
#include <unordered_map>
#include <utility>
#include "lex_string.h"
#include "map_helpers.h"
#include "my_alloc.h"
#include "my_base.h"
#include "my_dbug.h"
#include "my_sqlcommand.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/psi/mysql_statement.h"
#include "mysql/strings/m_ctype.h"
#include "mysql_com.h"
#include "mysql_time.h"
#include "mysqld_error.h"
#include "nulls.h"
#include "sql/auth/acl_change_notification.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/auth/auth_internal.h"
#include "sql/auth/sql_auth_cache.h"
#include "sql/auth/sql_authentication.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/binlog.h" /* mysql_bin_log.is_open() */
#include "sql/debug_sync.h"
#include "sql/error_handler.h" /* Internal_error_handler */
#include "sql/field.h"
#include "sql/handler.h"
#include "sql/item_func.h" /* mqh_used */
#include "sql/key.h" /* key_copy, key_cmp_if_same */
/* key_restore */
#include "sql/log.h" /* log_*() */
#include "sql/mdl.h"
#include "sql/mysqld.h"
#include "sql/rpl_filter.h" /* rpl_filter */
#include "sql/rpl_rli.h" /* class Relay_log_info */
#include "sql/sql_base.h" /* close_thread_tables */
#include "sql/sql_class.h"
#include "sql/sql_connect.h"
#include "sql/sql_const.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
/* trans_commit_implicit */
#include "sql/sql_parse.h" /* stmt_causes_implicit_commit */
#include "sql/sql_rewrite.h"
#include "sql/sql_table.h" /* write_bin_log */
#include "sql/sql_update.h" /* compare_records */
#include "sql/system_variables.h"
#include "sql/table.h" /* TABLE_FIELD_TYPE */
#include "sql/transaction.h" /* trans_commit_stmt */
#include "sql/tztime.h"
#include "sql_string.h"
#include "string_with_len.h"
#include "strxmov.h"
#include "thr_lock.h"
#include "typelib.h"
#include "violite.h"
/* Acl table names. Keep in sync with ACL_TABLES */
static const int MAX_ACL_TABLE_NAMES = 10;
static_assert(MAX_ACL_TABLE_NAMES == ACL_TABLES::LAST_ENTRY,
"Keep number of table names in sync with ACL table enum");
static const char *ACL_TABLE_NAMES[MAX_ACL_TABLE_NAMES] = {
"user", "db",
"tables_priv", "columns_priv",
"procs_priv", "proxies_priv",
"role_edges", "default_roles",
"global_grants", "password_history"};
static const TABLE_FIELD_TYPE mysql_db_table_fields[MYSQL_DB_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")}, {STRING_WITH_LEN("char(255)")}, {nullptr, 0}},
{{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Select_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Insert_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Update_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Delete_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Drop_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Grant_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("References_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Index_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Alter_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_tmp_table_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Lock_tables_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_view_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Show_view_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_routine_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Alter_routine_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Execute_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Event_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Trigger_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}}};
static const TABLE_FIELD_TYPE mysql_user_table_fields[MYSQL_USER_FIELD_COUNT] =
{{{STRING_WITH_LEN("Host")}, {STRING_WITH_LEN("char(255)")}, {nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Select_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Insert_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Update_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Delete_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Drop_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Reload_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Shutdown_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Process_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("File_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Grant_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("References_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Index_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Alter_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Show_db_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Super_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_tmp_table_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Lock_tables_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Execute_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Repl_slave_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Repl_client_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_view_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Show_view_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_routine_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Alter_routine_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_user_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Event_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Trigger_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_tablespace_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("ssl_type")},
{STRING_WITH_LEN("enum('','ANY','X509','SPECIFIED')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("ssl_cipher")}, {STRING_WITH_LEN("blob")}, {nullptr, 0}},
{{STRING_WITH_LEN("x509_issuer")},
{STRING_WITH_LEN("blob")},
{nullptr, 0}},
{{STRING_WITH_LEN("x509_subject")},
{STRING_WITH_LEN("blob")},
{nullptr, 0}},
{{STRING_WITH_LEN("max_questions")},
{STRING_WITH_LEN("int")},
{nullptr, 0}},
{{STRING_WITH_LEN("max_updates")}, {STRING_WITH_LEN("int")}, {nullptr, 0}},
{{STRING_WITH_LEN("max_connections")},
{STRING_WITH_LEN("int")},
{nullptr, 0}},
{{STRING_WITH_LEN("max_user_connections")},
{STRING_WITH_LEN("int")},
{nullptr, 0}},
{{STRING_WITH_LEN("plugin")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
{{STRING_WITH_LEN("authentication_string")},
{STRING_WITH_LEN("text")},
{nullptr, 0}},
{{STRING_WITH_LEN("password_expired")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("password_last_changed")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}},
{{STRING_WITH_LEN("password_lifetime")},
{STRING_WITH_LEN("smallint")},
{nullptr, 0}},
{{STRING_WITH_LEN("account_locked")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Create_role_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Drop_role_priv")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Password_reuse_history")},
{STRING_WITH_LEN("smallint")},
{nullptr, 0}},
{{STRING_WITH_LEN("Password_reuse_time")},
{STRING_WITH_LEN("smallint")},
{nullptr, 0}},
{{STRING_WITH_LEN("Password_require_current")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("User_attributes")},
{STRING_WITH_LEN("json")},
{nullptr, 0}}};
static const TABLE_FIELD_TYPE
mysql_proxies_priv_table_fields[MYSQL_PROXIES_PRIV_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Proxied_host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Proxied_user")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("With_grant")},
{STRING_WITH_LEN("tinyint")},
{nullptr, 0}},
{{STRING_WITH_LEN("Grantor")},
{STRING_WITH_LEN("varchar(288)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Timestamp")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}}};
static const TABLE_FIELD_TYPE
mysql_procs_priv_table_fields[MYSQL_PROCS_PRIV_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Routine_name")},
{STRING_WITH_LEN("char(64)")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Routine_type")},
{STRING_WITH_LEN("enum('FUNCTION','PROCEDURE','LIBRARY')")},
{nullptr, 0}},
{{STRING_WITH_LEN("Grantor")},
{STRING_WITH_LEN("varchar(288)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Proc_priv")},
{STRING_WITH_LEN("set('Execute','Alter Routine','Grant')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Timestamp")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}}};
static const TABLE_FIELD_TYPE
mysql_columns_priv_table_fields[MYSQL_COLUMNS_PRIV_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Table_name")},
{STRING_WITH_LEN("char(64)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Column_name")},
{STRING_WITH_LEN("char(64)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Timestamp")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}},
{{STRING_WITH_LEN("Column_priv")},
{STRING_WITH_LEN("set('Select','Insert','Update','References')")},
{STRING_WITH_LEN("utf8mb3")}}};
static const TABLE_FIELD_TYPE
mysql_tables_priv_table_fields[MYSQL_TABLES_PRIV_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Table_name")},
{STRING_WITH_LEN("char(64)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Grantor")},
{STRING_WITH_LEN("varchar(288)")},
{nullptr, 0}},
{{STRING_WITH_LEN("Timestamp")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}},
{{STRING_WITH_LEN("Table_priv")},
{STRING_WITH_LEN("set('Select','Insert','Update','Delete','Create',"
"'Drop','Grant','References','Index','Alter',"
"'Create View','Show view','Trigger')")},
{STRING_WITH_LEN("utf8mb3")}},
{{STRING_WITH_LEN("Column_priv")},
{STRING_WITH_LEN("set('Select','Insert','Update','References')")},
{STRING_WITH_LEN("utf8mb3")}}};
static const TABLE_FIELD_TYPE
mysql_role_edges_table_fields[MYSQL_ROLE_EDGES_FIELD_COUNT] = {
{{STRING_WITH_LEN("FROM_HOST")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("FROM_USER")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("TO_HOST")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("TO_USER")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("WITH_ADMIN_OPTION")},
{STRING_WITH_LEN("enum('N','Y')")},
{STRING_WITH_LEN("utf8mb3")}}};
static const TABLE_FIELD_TYPE
mysql_default_roles_table_fields[MYSQL_DEFAULT_ROLES_FIELD_COUNT] = {
{{STRING_WITH_LEN("HOST")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("USER")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("DEFAULT_ROLE_HOST")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("DEFAULT_ROLE_USER")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}}};
static const TABLE_FIELD_TYPE
mysql_password_history_table_fields[MYSQL_PASSWORD_HISTORY_FIELD_COUNT] = {
{{STRING_WITH_LEN("Host")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("User")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("Password_timestamp")},
{STRING_WITH_LEN("timestamp")},
{nullptr, 0}},
{{STRING_WITH_LEN("Password")},
{STRING_WITH_LEN("text")},
{nullptr, 0}}};
static const TABLE_FIELD_TYPE
mysql_dynamic_priv_table_fields[MYSQL_DYNAMIC_PRIV_FIELD_COUNT] = {
{{STRING_WITH_LEN("USER")},
{STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
{nullptr, 0}},
{{STRING_WITH_LEN("HOST")},
{STRING_WITH_LEN("char(255)")},
{nullptr, 0}},
{{STRING_WITH_LEN("PRIV")},
{STRING_WITH_LEN("char(32)")},
{nullptr, 0}},
{{STRING_WITH_LEN("WITH_GRANT_OPTION")},
{STRING_WITH_LEN("enum('N','Y')")},
{nullptr, 0}}};
/** keep in sync with @ref ACL_TABLES */
const TABLE_FIELD_DEF Acl_table_intact::mysql_acl_table_defs[] = {
{MYSQL_USER_FIELD_COUNT, mysql_user_table_fields},
{MYSQL_DB_FIELD_COUNT, mysql_db_table_fields},
{MYSQL_TABLES_PRIV_FIELD_COUNT, mysql_tables_priv_table_fields},
{MYSQL_COLUMNS_PRIV_FIELD_COUNT, mysql_columns_priv_table_fields},
{MYSQL_PROCS_PRIV_FIELD_COUNT, mysql_procs_priv_table_fields},
{MYSQL_PROXIES_PRIV_FIELD_COUNT, mysql_proxies_priv_table_fields},
{MYSQL_ROLE_EDGES_FIELD_COUNT, mysql_role_edges_table_fields},
{MYSQL_DEFAULT_ROLES_FIELD_COUNT, mysql_default_roles_table_fields},
{MYSQL_DYNAMIC_PRIV_FIELD_COUNT, mysql_dynamic_priv_table_fields},
{MYSQL_PASSWORD_HISTORY_FIELD_COUNT, mysql_password_history_table_fields}};
static bool acl_tables_setup_for_write_and_acquire_mdl(THD *thd,
Table_ref *tables);
/**
A helper function to commit statement transaction and close
ACL tables after reading some data from them as part of FLUSH
PRIVILEGES statement or during server initialization.
@note We assume that we have only read from the tables so commit
can't fail. @sa close_mysql_tables().
@note This function also rollbacks the transaction if rollback was
requested (e.g. as result of deadlock).
*/
void commit_and_close_mysql_tables(THD *thd) {
/* Transaction rollback request by SE is unlikely. Still we handle it. */
if (thd->transaction_rollback_request) {
trans_rollback_stmt(thd);
trans_rollback_implicit(thd);
} else {
#ifndef NDEBUG
const bool res =
#endif
/*
In @@autocommit=0 mode we have both statement and multi-statement
transactions started here. Since we don't want storage engine locks
to stay around after metadata locks are released by
close_mysql_tables() we need to do implicit commit here.
*/
trans_commit_stmt(thd) || trans_commit_implicit(thd);
assert(res == false);
}
close_mysql_tables(thd);
}
extern bool initialized;
/*
Get all access bits from table after fieldnr
IMPLEMENTATION
We know that the access privileges ends when there is no more fields
or the field is not an enum with two elements.
SYNOPSIS
get_access()
form an open table to read privileges from.
The record should be already read in table->record[0]
fieldnr number of the first privilege (that is ENUM('N','Y') field
next_field on return - number of the field next to the last ENUM
(unless next_field == 0)
RETURN VALUE
privilege mask
*/
Access_bitmask get_access(TABLE *form, uint fieldnr, uint *next_field) {
Access_bitmask access_bits = 0, bit;
char buff[2];
String res(buff, sizeof(buff), &my_charset_latin1);
Field **pos;
for (pos = form->field + fieldnr, bit = 1;
*pos && (*pos)->real_type() == MYSQL_TYPE_ENUM &&
((Field_enum *)(*pos))->typelib->count == 2;
pos++, fieldnr++, bit <<= 1) {
(*pos)->val_str(&res);
if (my_toupper(&my_charset_latin1, res[0]) == 'Y') access_bits |= bit;
}
if (next_field) *next_field = fieldnr;
return access_bits;
}
/**
Notify handlerton(s) that privileges have changed
Interested handlertons may use this notification to update
its own privilege structures as well as propagating
the changing query to other destinations.
*/
Acl_change_notification::Acl_change_notification(
THD *thd, enum_sql_command op, const List<LEX_USER> *stmt_users,
std::set<LEX_USER *> *rewrite_users, const List<LEX_CSTRING> *dynamic_privs)
: db{thd->db().str, thd->db().length},
operation(op),
users(stmt_users ? *stmt_users : empty_users),
rewrite_user_params(rewrite_users),
dynamic_privs(dynamic_privs ? *dynamic_privs : empty_dynamic_privs) {}
void acl_notify_htons(THD *thd, enum_sql_command operation,
const List<LEX_USER> *users,
std::set<LEX_USER *> *rewrite_users,
const List<LEX_CSTRING> *dynamic_privs) {
DBUG_TRACE;
DBUG_PRINT("enter", ("db: %s query: '%s'", thd->db().str, thd->query().str));
Acl_change_notification notice(thd, operation, users, rewrite_users,
dynamic_privs);
ha_acl_notify(thd, ¬ice);
}
/**
Commit or rollback ACL statement (and transaction),
close tables which it has opened and release metadata locks.
@note In case of failure to commit transaction we try to restore correct
state of in-memory structures by reloading privileges.
@retval False - Success.
@retval True - Error.
*/
static bool acl_end_trans_and_close_tables(
THD *thd, bool rollback_transaction,
Lock_state_list *modified_user_lock_state_list) {
bool result;
/*
Try to commit a transaction even if we had some failures.
Without this step changes to privilege tables will be rolled back at the
end of mysql_execute_command() in the presence of error, leaving on-disk
and in-memory descriptions of privileges out of sync and making behavior
of ACL statements for transactional tables incompatible with legacy
behavior.
We need to commit both statement and normal transaction to make behavior
consistent with both autocommit on and off.
It is safe to do so since ACL statement always do implicit commit at the
end of statement.
*/
assert(stmt_causes_implicit_commit(thd, CF_IMPLICIT_COMMIT_END));
/*
ACL DDL operations must acquire IX Backup Lock in order to be mutually
exclusive with LOCK INSTANCE FOR BACKUP.
*/
assert(thd->mdl_context.owns_equal_or_stronger_lock(
MDL_key::BACKUP_LOCK, "", "", MDL_INTENTION_EXCLUSIVE));
if (rollback_transaction) {
/*
Transaction rollback request by SE is unlikely. Still let us
handle it and also do ACL reload if it happens.
*/
result = trans_rollback_stmt(thd);
result |= trans_rollback_implicit(thd);
} else {
result = trans_commit_stmt(thd);
result |= trans_commit_implicit(thd);
}
close_thread_tables(thd);
if (result || rollback_transaction) {
/*
Try to bring in-memory structures back in sync with on-disk data if we
have failed to commit our changes.
*/
DBUG_EXECUTE_IF("wl14084_acl_ddl_error_before_cache_reload_trigger_timeout",
sleep(2););
reload_acl_caches(thd, true, true, modified_user_lock_state_list);
close_thread_tables(thd);
}
thd->mdl_context.release_transactional_locks();
return result;
}
/*
Function to handle rewriting and bin logging of ACL ddl.
Assumption : Error if any has already been raised.
Effect : In case of rollback, acl caches will be reloaded.
@param thd Handle to THD object.
Required for query rewriting
@param transactional_table Nature of ACL tables
@param extra_users Users which were not processed
@param rewrite_params Information required for query rewrite
@param extra error Used in cases where error handler
is suppressed.
@param write_to_binlog Skip writing to binlog.
Used for routine grants while
creating routine.
@param modified_user_lock_state_list
List of users whose temporary account
locking attributes are likely modified.
@returns status of log and commit
@retval 0 Successfully committed. Optionally : written to binlog.
@retval 1 If an error is raised at any stage
*/
bool log_and_commit_acl_ddl(
THD *thd, bool transactional_tables,
std::set<LEX_USER *> *extra_users, /* = NULL */
Rewrite_params *rewrite_params, /* = NULL */
bool extra_error, /* = false */
bool write_to_binlog, /* = true */
Lock_state_list *modified_user_lock_state_list) { /* = nullptr */
bool result = false;
DBUG_TRACE;
assert(thd);
result = thd->is_error() || extra_error || thd->transaction_rollback_request;
/* Write to binlog and textlogs only if there is no error */
if (!result) {
String rlb;
/*
We're requesting a rewrite with instrumentation. This will change
the value on the THD and those seen in instrumentation.
*/
mysql_rewrite_acl_query(thd, rlb, Consumer_type::BINLOG, rewrite_params);
if (write_to_binlog) {
LEX_CSTRING query;
enum_sql_command command;
size_t num_extra_users = extra_users ? extra_users->size() : 0;
command = thd->lex->sql_command;
if (mysql_bin_log.is_open()) {
query.str = thd->rewritten_query().length()
? thd->rewritten_query().ptr()
: thd->query().str;
query.length = thd->rewritten_query().length()
? thd->rewritten_query().length()
: thd->query().length;
/* Write to binary log */
result = (write_bin_log(thd, false, query.str, query.length,
transactional_tables) != 0)
? true
: false;
/*
Log warning about extra users in case of
CREATE USER IF NOT EXISTS/ALTER USER IF EXISTS
*/
if ((command == SQLCOM_CREATE_USER || command == SQLCOM_ALTER_USER) &&
!result && num_extra_users) {
String warn_user;
bool comma = false;
bool log_warning = false;
for (LEX_USER *extra_user : *extra_users) {
/*
Consider for warning if one of the following is true:
1. If SQLCOM_CREATE_USER, IDENTIFIED WITH clause is not used
2. If SQLCOM_ALTER_USER, IDENTIFIED WITH clause is not used
but IDENTIFIED BY is used.
*/
if (!extra_user->first_factor_auth_info
.uses_identified_with_clause &&
(command == SQLCOM_CREATE_USER ||
extra_user->first_factor_auth_info
.uses_identified_by_clause)) {
log_user(thd, &warn_user, extra_user, comma);
comma = true;
log_warning = true;
}
}
if (log_warning) {
std::string default_authentication_plugin;
authentication_policy::get_first_factor_default_plugin(
default_authentication_plugin);
LogErr(WARNING_LEVEL,
(command == SQLCOM_CREATE_USER)
? ER_SQL_USER_TABLE_CREATE_WARNING
: ER_SQL_USER_TABLE_ALTER_WARNING,
default_authentication_plugin.c_str(),
warn_user.c_ptr_safe());
}
warn_user.mem_free();
}
}
}
/*
Rewrite query in the thd again for the consistent logging for all consumer
type TEXTLOG later on. For instance: Audit logs.
We're requesting a rewrite with instrumentation. This will change
(back) the value on the THD and those seen in instrumentation.
*/
mysql_rewrite_acl_query(thd, rlb, Consumer_type::TEXTLOG, rewrite_params);
}
if (acl_end_trans_and_close_tables(thd, result,
modified_user_lock_state_list)) {
result = true;
}
return result;
}
static void get_grantor(THD *thd, char *grantor) {
const char *user = thd->security_context()->user().str;
const char *host = thd->security_context()->host_or_ip().str;
if (thd->slave_thread && thd->has_invoker()) {
user = thd->get_invoker_user().str;
host = thd->get_invoker_host().str;
}
strxmov(grantor, user, "@", host, NullS);
}
/**
Take a handler error and generate the mysql error ER_ACL_OPERATION_FAILED
containing original text of HA error.
@param handler_error an error number resulted from storage engine
*/
void acl_print_ha_error(int handler_error) {
char buffer[MYSYS_ERRMSG_SIZE];
my_strerror(buffer, sizeof(buffer), handler_error);
my_error(ER_ACL_OPERATION_FAILED, MYF(0), handler_error, buffer);
}
/**
change grants in the mysql.db table.
Legacy version of the function to be removed in future.
@param thd Current thread execution context.
@param table Pointer to a TABLE object for opened mysql.db table.
@param db Database name of table for which column privileges are
modified.
@param combo Pointer to a LEX_USER object containing info about a user
being processed.
@param rights Database level grant.
@param revoke_grant Set to true if this is a REVOKE command.
@return Operation result
@retval 0 OK.
@retval 1 Error in handling current user entry but still can continue
processing subsequent user specified in the ACL statement.
@retval < 0 Error.
*/
static int compatibility_replace_db_table(THD *thd, TABLE *table,
const char *db, const LEX_USER &combo,
Access_bitmask rights,
bool revoke_grant) {
uint i;
Access_bitmask priv, store_rights;
bool old_row_exists = false;
int error;
const char what = (revoke_grant) ? 'N' : 'Y';
uchar user_key[MAX_KEY_LENGTH];
Acl_table_intact table_intact(thd);
DBUG_TRACE;
assert(initialized);
assert(thd->variables.original_server_version < 80300);
if (table_intact.check(table, ACL_TABLES::TABLE_DB)) return -1;
/* Check if there is such a user in user table in memory? */
if (!find_acl_user(combo.host.str, combo.user.str, false)) {
my_error(ER_PASSWORD_NO_MATCH, MYF(0));
return 1;
}
table->use_all_columns();
table->field[0]->store(combo.host.str, combo.host.length,
system_charset_info);
table->field[1]->store(db, strlen(db), system_charset_info);
table->field[2]->store(combo.user.str, combo.user.length,
system_charset_info);
key_copy(user_key, table->record[0], table->key_info,
table->key_info->key_length);
error = table->file->ha_index_read_idx_map(table->record[0], 0, user_key,
HA_WHOLE_KEY, HA_READ_KEY_EXACT);
assert(error != HA_ERR_LOCK_DEADLOCK);
assert(error != HA_ERR_LOCK_WAIT_TIMEOUT);
DBUG_EXECUTE_IF("wl7158_replace_db_table_1", error = HA_ERR_LOCK_DEADLOCK;);
if (error) {
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
goto table_error;
if (what == 'N') { // no row, no revoke
/*
Return 1 as an indication that expected error occurred during
handling of REVOKE statement for an unknown user.
*/
if (report_missing_user_grant_message(thd, true, combo.user.str,
combo.host.str, nullptr,
ER_NONEXISTING_GRANT))
return 1;
else
return 0;
}
old_row_exists = false;
restore_record(table, s->default_values);
table->field[0]->store(combo.host.str, combo.host.length,
system_charset_info);
table->field[1]->store(db, strlen(db), system_charset_info);
table->field[2]->store(combo.user.str, combo.user.length,
system_charset_info);
} else {
old_row_exists = true;
store_record(table, record[1]);
}
store_rights = get_rights_for_db(rights);
for (i = 3, priv = 1; i < table->s->fields; i++, priv <<= 1) {
if (priv & store_rights) // do it if priv is chosen
table->field[i]->store(&what, 1,
&my_charset_latin1); // set requested privileges
}
rights = get_access(table, 3, nullptr);
rights = fix_rights_for_db(rights);
if (old_row_exists) {
/* update old existing row */
if (rights) {
error = table->file->ha_update_row(table->record[1], table->record[0]);
assert(error != HA_ERR_FOUND_DUPP_KEY);
assert(error != HA_ERR_LOCK_DEADLOCK);
assert(error != HA_ERR_LOCK_WAIT_TIMEOUT);
DBUG_EXECUTE_IF("wl7158_replace_db_table_2",
error = HA_ERR_LOCK_DEADLOCK;);
if (error && error != HA_ERR_RECORD_IS_THE_SAME) goto table_error;
} else /* must have been a revoke of all privileges */
{
error = table->file->ha_delete_row(table->record[1]);
assert(error != HA_ERR_LOCK_DEADLOCK);
assert(error != HA_ERR_LOCK_WAIT_TIMEOUT);
DBUG_EXECUTE_IF("wl7158_replace_db_table_3",
error = HA_ERR_LOCK_DEADLOCK;);
if (error) goto table_error; /* purecov: deadcode */
}
} else if (rights) {
error = table->file->ha_write_row(table->record[0]);
assert(error != HA_ERR_FOUND_DUPP_KEY);
assert(error != HA_ERR_LOCK_DEADLOCK);
assert(error != HA_ERR_LOCK_WAIT_TIMEOUT);
DBUG_EXECUTE_IF("wl7158_replace_db_table_4", error = HA_ERR_LOCK_DEADLOCK;);
if (error) {
if (!table->file->is_ignorable_error(error))
goto table_error; /* purecov: deadcode */
}
}
clear_and_init_db_cache(); // Clear privilege cache
if (old_row_exists)
acl_update_db(combo.user.str, combo.host.str, db, rights);
else if (rights)
acl_insert_db(combo.user.str, combo.host.str, db, rights);
return 0;
table_error:
acl_print_ha_error(error);
return -1;
}
/**
Check if value of the original_server_version variable is lower than the
version that supports the feature, so the following code should be run in a
backward compatibility mode.
@param thd Current thread execution context
@param fix_version Version in which fix/feature was implemented
@retval true a compatibility mode is required
@retval false a compatibility mode is not required
*/
inline bool compatibility_mode(const THD *thd, uint32_t fix_version) {
assert(thd);
return (thd->variables.original_server_version < fix_version);
}
/**
change grants in the mysql.db table.
@param thd Current thread execution context.
@param table Pointer to a TABLE object for opened mysql.db table.
@param db Database name of table for which column privileges are
modified.
@param combo Pointer to a LEX_USER object containing info about a user
being processed.
@param rights Database level grant.
@param revoke_grant Set to true if this is a REVOKE command.
@param all_current_privileges Set to true if this is GRANT/REVOKE ALL
@return Operation result
@retval 0 OK.
@retval 1 Error in handling current user entry but still can continue
processing subsequent user specified in the ACL statement.
@retval < 0 Error.
*/
int replace_db_table(THD *thd, TABLE *table, const char *db,
const LEX_USER &combo, Access_bitmask rights,
bool revoke_grant, bool all_current_privileges) {
uint i;
Access_bitmask priv, store_rights;
bool old_row_exists = false;
Access_bitmask old_rights, nonexisting_rights;
int error;
const char what = (revoke_grant) ? 'N' : 'Y';
uchar user_key[MAX_KEY_LENGTH];
Acl_table_intact table_intact(thd);
/* The backward compatibility support, needed as fix of Bug#33897859 (pushed
* to Mysql 8.3) modifies behavior. To be removed with the next
* major release.
*/
if (compatibility_mode(thd, 80300))