GRANT

Syntax

GRANT
    priv_type [(column_list)]
      [, priv_type [(column_list)]] ...
    ON [object_type] priv_level
    TO user_specification [ user_options ...]

user_specification:
  username [authentication_option]
  | PUBLIC
authentication_option:
  IDENTIFIED BY 'password' 
  | IDENTIFIED BY PASSWORD 'password_hash'
  | IDENTIFIED {VIA|WITH} authentication_rule [OR authentication_rule  ...]

authentication_rule:
    authentication_plugin
  | authentication_plugin {USING|AS} 'authentication_string'
  | authentication_plugin {USING|AS} PASSWORD('password')

GRANT PROXY ON username
    TO user_specification [, user_specification ...]
    [WITH GRANT OPTION]

GRANT rolename TO grantee [, grantee ...]
    [WITH ADMIN OPTION]

grantee:
    rolename
    username [authentication_option]

user_options:
    [REQUIRE {NONE | tls_option [[AND] tls_option] ...}]
    [WITH with_option [with_option] ...]

object_type:
    TABLE
  | FUNCTION
  | PROCEDURE
  | PACKAGE
  | PACKAGE BODY

priv_level:
    *
  | *.*
  | db_name.*
  | db_name.tbl_name
  | tbl_name
  | db_name.routine_name

with_option:
    GRANT OPTION
  | resource_option

resource_option:
  MAX_QUERIES_PER_HOUR count
  | MAX_UPDATES_PER_HOUR count
  | MAX_CONNECTIONS_PER_HOUR count
  | MAX_USER_CONNECTIONS count
  | MAX_STATEMENT_TIME time

tls_option:
  SSL 
  | X509
  | CIPHER 'cipher'
  | ISSUER 'issuer'
  | SUBJECT 'subject'

Description

The GRANT statement allows you to grant privileges or roles to accounts. To use GRANT, you must have the GRANT OPTION privilege, and you must have the privileges that you are granting.

Use the REVOKE statement to revoke privileges granted with the GRANT statement.

Use the SHOW GRANTS statement to determine what privileges an account has.

Account Names

For GRANT statements, account names are specified as the username argument in the same way as they are for CREATE USER statements. See account names from the CREATE USER page for details on how account names are specified.

Implicit Account Creation

The GRANT statement also allows you to implicitly create accounts in some cases.

If the account does not yet exist, then GRANT can implicitly create it. To implicitly create an account with GRANT, a user is required to have the same privileges that would be required to explicitly create the account with the CREATE USER statement.

If the NO_AUTO_CREATE_USER SQL_MODE is set, then accounts can only be created if authentication information is specified, or with a CREATE USER statement. If no authentication information is provided, GRANT will produce an error when the specified account does not exist, for example:

show variables like '%sql_mode%' ;
+---------------+--------------------------------------------+
| Variable_name | Value                                      |
+---------------+--------------------------------------------+
| sql_mode      | NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
+---------------+--------------------------------------------+

GRANT USAGE ON *.* TO 'user123'@'%' IDENTIFIED BY '';
ERROR 1133 (28000): Can't find any matching row in the user table

GRANT USAGE ON *.* TO 'user123'@'%' 
  IDENTIFIED VIA PAM using 'mariadb' require ssl ;
Query OK, 0 rows affected (0.00 sec)
 
select host, user from mysql.user where user='user123' ;

+------+----------+
| host | user     |
+------+----------+
| %    | user123 |
+------+----------+

Privilege Levels

Privileges can be set globally, for an entire database, for a table or routine, or for individual columns in a table. Certain privileges can only be set at certain levels.

Global privileges do not take effect immediately and are only applied to connections created after the GRANT statement was executed.

• Global privileges priv_type are granted using *.* for priv_level. Global privileges include privileges to administer the database and manage user accounts, as well as privileges for all tables, functions, and procedures. Global privileges are stored in the mysql.user table prior to MariaDB 10.4, and in mysql.global_priv table afterwards.
• Database privileges priv_type are granted using db_name.* for priv_level, or using just * to use default database. Database privileges include privileges to create tables and functions, as well as privileges for all tables, functions, and procedures in the database. Database privileges are stored in the mysql.db table.
• Table privileges priv_type are granted using db_name.tbl_name for priv_level, or using just tbl_name to specify a table in the default database. The TABLE keyword is optional. Table privileges include the ability to select and change data in the table. Certain table privileges can be granted for individual columns.
• Column privileges priv_type are granted by specifying a table for priv_level and providing a column list after the privilege type. They allow you to control exactly which columns in a table users can select and change.
• Function privileges priv_type are granted using FUNCTION db_name.routine_name for priv_level, or using just FUNCTION routine_name to specify a function in the default database.
• Procedure privileges priv_type are granted using PROCEDURE db_name.routine_name for priv_level, or using just PROCEDURE routine_name to specify a procedure in the default database.

The USAGE Privilege

The USAGE privilege grants no real privileges. The SHOW GRANTS statement will show a global USAGE privilege for a newly-created user. You can use USAGE with the GRANT statement to change options like GRANT OPTION and MAX_USER_CONNECTIONS without changing any account privileges.

The ALL PRIVILEGES Privilege

The ALL PRIVILEGES privilege grants all available privileges. Granting all privileges only affects the given privilege level. For example, granting all privileges on a table does not grant any privileges on the database or globally.

Using ALL PRIVILEGES does not grant the special GRANT OPTION privilege.

You can use ALL instead of ALL PRIVILEGES.

The GRANT OPTION Privilege

Use the WITH GRANT OPTION clause to give users the ability to grant privileges to other users at the given privilege level. Users with the GRANT OPTION privilege can only grant privileges they have. They cannot grant privileges at a higher privilege level than they have the GRANT OPTION privilege.

The GRANT OPTION privilege cannot be set for individual columns. If you use WITH GRANT OPTION when specifying column privileges, the GRANT OPTION privilege will be granted for the entire table.

Using the WITH GRANT OPTION clause is equivalent to listing GRANT OPTION as a privilege.

Global Privileges

The following table lists the privileges that can be granted globally. You can also grant all database, table, and function privileges globally. When granted globally, these privileges apply to all databases, tables, or functions, including those created later.

To set a global privilege, use *.* for priv_level.

BINLOG ADMIN

Enables administration of the binary log, including the PURGE BINARY LOGS statement and setting the system variables:

• binlog_annotate_row_events
• binlog_cache_size
• binlog_commit_wait_count
• binlog_commit_wait_usec
• binlog_direct_non_transactional_updates
• binlog_expire_logs_seconds
• binlog_file_cache_size
• binlog_format
• binlog_row_image
• binlog_row_metadata
• binlog_stmt_cache_size
• expire_logs_days
• log_bin_compress
• log_bin_compress_min_len
• log_bin_trust_function_creators
• max_binlog_cache_size
• max_binlog_size
• max_binlog_stmt_cache_size
• sql_log_bin and
• sync_binlog.

Added in MariaDB 10.5.2.

BINLOG MONITOR

New name for REPLICATION CLIENT from MariaDB 10.5.2, (REPLICATION CLIENT still supported as an alias for compatibility purposes). Permits running SHOW commands related to the binary log, in particular the SHOW BINLOG STATUS and SHOW BINARY LOGS statements. Unlike REPLICATION CLIENT prior to MariaDB 10.5, SHOW REPLICA STATUS isn't included in this privilege, and REPLICA MONITOR is required.

BINLOG REPLAY

Enables replaying the binary log with the BINLOG statement (generated by mariadb-binlog), executing SET timestamp when secure_timestamp is set to replication, and setting the session values of system variables usually included in BINLOG output, in particular:

• gtid_domain_id
• gtid_seq_no
• pseudo_thread_id
• server_id.

Added in MariaDB 10.5.2

CONNECTION ADMIN

Enables administering connection resource limit options. This includes ignoring the limits specified by: max_user_connections and max_password_errors. And allowing one extra connection over max_connections

The statements specified in init_connect are not executed, killing connections and queries owned by other users is permitted. The following connection-related system variables can be changed:

• connect_timeout
• disconnect_on_expired_password
• extra_max_connections
• init_connect
• max_connections
• max_connect_errors
• max_password_errors
• proxy_protocol_networks
• secure_auth
• slow_launch_time
• thread_pool_exact_stats
• thread_pool_dedicated_listener
• thread_pool_idle_timeout
• thread_pool_max_threads
• thread_pool_min_threads
• thread_pool_oversubscribe
• thread_pool_prio_kickup_timer
• thread_pool_priority
• thread_pool_size, and
• thread_pool_stall_limit.

Added in MariaDB 10.5.2.

CREATE USER

Create a user using the CREATE USER statement, or implicitly create a user with the GRANT statement.

FEDERATED ADMIN

Execute CREATE SERVER, ALTER SERVER, and DROP SERVER statements. Added in MariaDB 10.5.2.

FILE

Read and write files on the server, using statements like LOAD DATA INFILE or functions like LOAD_FILE(). Also needed to create CONNECT outward tables. MariaDB server must have the permissions to access those files.

GRANT OPTION

Grant global privileges. You can only grant privileges that you have.

PROCESS

Show information about the active processes, for example via SHOW PROCESSLIST or mariadb-admin processlist. If you have the PROCESS privilege, you can see all threads. Otherwise, you can see only your own threads (that is, threads associated with the MariaDB account that you are using).

READ_ONLY ADMIN

User ignores the read_only system variable, and can perform write operations even when the read_only option is active. Added in MariaDB 10.5.2.

From MariaDB 10.11.0, the READ_ONLY ADMIN privilege has been removed from SUPER. The benefit of this is that one can remove the READ_ONLY ADMIN privilege from all users and ensure that no one can make any changes on any non-temporary tables. This is useful on replicas when one wants to ensure that the replica is kept identical to the primary.

RELOAD

Execute FLUSH statements or equivalent mariadb-admin commands.

REPLICATION CLIENT

Execute SHOW MASTER STATUS and SHOW BINARY LOGS informative statements. Renamed to BINLOG MONITOR in MariaDB 10.5.2 (but still supported as an alias for compatibility reasons). SHOW SLAVE STATUS was part of REPLICATION CLIENT prior to MariaDB 10.5.

REPLICATION MASTER ADMIN

Permits administration of primary servers, including the SHOW REPLICA HOSTS statement, and setting the gtid_binlog_state, gtid_domain_id, master_verify_checksum and server_id system variables. Added in MariaDB 10.5.2.

REPLICA MONITOR

Permit SHOW REPLICA STATUS and SHOW RELAYLOG EVENTS. From MariaDB 10.5.9.

When a user would upgrade from an older major release to a MariaDB 10.5 minor release prior to MariaDB 10.5.9, certain user accounts would lose capabilities. For example, a user account that had the REPLICATION CLIENT privilege in older major releases could run SHOW REPLICA STATUS, but after upgrading to a MariaDB 10.5 minor release prior to MariaDB 10.5.9, they could no longer run SHOW REPLICA STATUS, because that statement was changed to require the REPLICATION REPLICA ADMIN privilege.

This issue is fixed in MariaDB 10.5.9 with this new privilege, which now grants the user the ability to execute SHOW [ALL] (SLAVE | REPLICA) STATUS.

When a database is upgraded from an older major release to MariaDB Server 10.5.9 or later, any user accounts with the REPLICATION CLIENT or REPLICATION SLAVE privileges will automatically be granted the new REPLICA MONITOR privilege. The privilege fix occurs when the server is started up, not when mariadb-upgrade is performed.

However, when a database is upgraded from an early 10.5 minor release to 10.5.9 and later, the user will have to fix any user account privileges manually.

REPLICATION REPLICA

Synonym for REPLICATION SLAVE. From MariaDB 10.5.1.

REPLICATION SLAVE

Accounts used by replica servers on the primary need this privilege. This is needed to get the updates made on the master. From MariaDB 10.5.1, REPLICATION REPLICA is an alias for REPLICATION SLAVE.

REPLICATION SLAVE ADMIN

Permits administering replica servers, including START REPLICA/SLAVE, STOP REPLICA/SLAVE, CHANGE MASTER, SHOW REPLICA/SLAVE STATUS, SHOW RELAYLOG EVENTS statements, replaying the binary log with the BINLOG statement (generated by mariadb-binlog), and setting the system variables:

• gtid_cleanup_batch_size
• gtid_ignore_duplicates
• gtid_pos_auto_engines
• gtid_slave_pos
• gtid_strict_mode
• init_slave
• read_binlog_speed_limit
• relay_log_purge
• relay_log_recovery
• replicate_do_db
• replicate_do_table
• replicate_events_marked_for_skip
• replicate_ignore_db
• replicate_ignore_table
• replicate_wild_do_table
• replicate_wild_ignore_table
• slave_compressed_protocol
• slave_ddl_exec_mode
• slave_domain_parallel_threads
• slave_exec_mode
• slave_max_allowed_packet
• slave_net_timeout
• slave_parallel_max_queued
• slave_parallel_mode
• slave_parallel_threads
• slave_parallel_workers
• slave_run_triggers_for_rbr
• slave_sql_verify_checksum
• slave_transaction_retry_interval
• slave_type_conversions
• sync_master_info
• sync_relay_log, and
• sync_relay_log_info.

Added in MariaDB 10.5.2.

SET USER

Enables setting the DEFINER when creating triggers, views, stored functions and stored procedures. Added in MariaDB 10.5.2.

SHOW DATABASES

List all databases using the SHOW DATABASES statement. Without the SHOW DATABASES privilege, you can still issue the SHOW DATABASES statement, but it will only list databases containing tables on which you have privileges.

SHUTDOWN

Shut down the server using SHUTDOWN or the mariadb-admin shutdown command.

SUPER

Execute superuser statements: CHANGE MASTER TO, KILL (users who do not have this privilege can only KILL their own threads), PURGE LOGS, SET global system variables, or the mariadb-admin debug command. Also, this permission allows the user to write data even if the read_only startup option is set, enable or disable logging, enable or disable replication on replica, specify a DEFINER for statements that support that clause, connect once reaching the MAX_CONNECTIONS. If a statement has been specified for the init-connect mariadbd option, that command will not be executed when a user with SUPER privileges connects to the server.

The SUPER privilege has been split into multiple smaller privileges from MariaDB 10.5.2 to allow for more fine-grained privileges (MDEV-21743). The privileges are:

• SET USER
• FEDERATED ADMIN
• CONNECTION ADMIN
• REPLICATION SLAVE ADMIN
• BINLOG ADMIN
• BINLOG REPLAY
• REPLICA MONITOR
• BINLOG MONITOR
• REPLICATION MASTER ADMIN
• READ_ONLY ADMIN

However, the smaller privileges are still a part of the SUPER grant in MariaDB 10.5.2. From MariaDB 11.0.1 onwards, these grants are no longer a part of SUPER and need to be granted separately (MDEV-29668).

From MariaDB 10.11.0, the READ_ONLY ADMIN privilege has been removed from SUPER. The benefit of this is that one can remove the READ_ONLY ADMIN privilege from all users and ensure that no one can make any changes on any non-temporary tables. This is useful on replicas when one wants to ensure that the replica is kept identical to the primary (MDEV-29596).

Database Privileges

The following table lists the privileges that can be granted at the database level. You can also grant all table and function privileges at the database level. Table and function privileges on a database apply to all tables or functions in that database, including those created later.

To set a privilege for a database, specify the database using db_name.* for priv_level, or just use * to specify the default database.

Table Privileges

Column Privileges

Some table privileges can be set for individual columns of a table. To use column privileges, specify the table explicitly and provide a list of column names after the privilege type. For example, the following statement would allow the user to read the names and positions of employees, but not other information from the same table, such as salaries.

GRANT SELECT (name, position) on Employee to 'jeffrey'@'localhost';

Function Privileges

Procedure Privileges

GRANT EXECUTE ON PROCEDURE mysql.create_db TO maintainer;

Proxy Privileges

The PROXY privilege allows one user to proxy as another user, which means their privileges change to that of the proxy user, and the CURRENT_USER() function returns the user name of the proxy user.

The PROXY privilege only works with authentication plugins that support it. The default mysql_native_password authentication plugin does not support proxy users.

The pam authentication plugin is the only plugin included with MariaDB that currently supports proxy users. The PROXY privilege is commonly used with the pam authentication plugin to enable user and group mapping with PAM.

For example, to grant the PROXY privilege to an anonymous account that authenticates with the pam authentication plugin, you could execute the following:

CREATE USER 'dba'@'%' IDENTIFIED BY 'strongpassword';
GRANT ALL PRIVILEGES ON *.* TO 'dba'@'%' ;

CREATE USER ''@'%' IDENTIFIED VIA pam USING 'mariadb';
GRANT PROXY ON 'dba'@'%' TO ''@'%';

A user account can only grant the PROXY privilege for a specific user account if the granter also has the PROXY privilege for that specific user account, and if that privilege is defined WITH GRANT OPTION. For example, the following example fails because the granter does not have the PROXY privilege for that specific user account at all:

SELECT USER(), CURRENT_USER();
+-----------------+-----------------+
| USER()          | CURRENT_USER()  |
+-----------------+-----------------+
| alice@localhost | alice@localhost |
+-----------------+-----------------+

SHOW GRANTS;
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for alice@localhost                                                                                            |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'alice'@'localhost' IDENTIFIED BY PASSWORD '*2470C0C06DEE42FD1618BB99005ADCA2EC9D1E19' |
+-----------------------------------------------------------------------------------------------------------------------+

GRANT PROXY ON 'dba'@'localhost' TO 'bob'@'localhost';
ERROR 1698 (28000): Access denied for user 'alice'@'localhost'

And the following example fails because the granter does have the PROXY privilege for that specific user account, but it is not defined WITH GRANT OPTION:

SELECT USER(), CURRENT_USER();
+-----------------+-----------------+
| USER()          | CURRENT_USER()  |
+-----------------+-----------------+
| alice@localhost | alice@localhost |
+-----------------+-----------------+

SHOW GRANTS;
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for alice@localhost                                                                                            |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'alice'@'localhost' IDENTIFIED BY PASSWORD '*2470C0C06DEE42FD1618BB99005ADCA2EC9D1E19' |
| GRANT PROXY ON 'dba'@'localhost' TO 'alice'@'localhost'                                                               |
+-----------------------------------------------------------------------------------------------------------------------+

GRANT PROXY ON 'dba'@'localhost' TO 'bob'@'localhost';
ERROR 1698 (28000): Access denied for user 'alice'@'localhost'

But the following example succeeds because the granter does have the PROXY privilege for that specific user account, and it is defined WITH GRANT OPTION:

SELECT USER(), CURRENT_USER();
+-----------------+-----------------+
| USER()          | CURRENT_USER()  |
+-----------------+-----------------+
| alice@localhost | alice@localhost |
+-----------------+-----------------+

SHOW GRANTS;
+-----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for alice@localhost                                                                                                              |
+-----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'alice'@'localhost' IDENTIFIED BY PASSWORD '*2470C0C06DEE42FD1618BB99005ADCA2EC9D1E19' WITH GRANT OPTION |
| GRANT PROXY ON 'dba'@'localhost' TO 'alice'@'localhost' WITH GRANT OPTION                                                               |
+-----------------------------------------------------------------------------------------------------------------------------------------+

GRANT PROXY ON 'dba'@'localhost' TO 'bob'@'localhost';

A user account can grant the PROXY privilege for any other user account if the granter has the PROXY privilege for the ''@'%' anonymous user account, like this:

GRANT PROXY ON ''@'%' TO 'dba'@'localhost' WITH GRANT OPTION;

For example, the following example succeeds because the user can grant the PROXY privilege for any other user account:

SELECT USER(), CURRENT_USER();
+-----------------+-----------------+
| USER()          | CURRENT_USER()  |
+-----------------+-----------------+
| alice@localhost | alice@localhost |
+-----------------+-----------------+

SHOW GRANTS;
+-----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for alice@localhost                                                                                                              |
+-----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'alice'@'localhost' IDENTIFIED BY PASSWORD '*2470C0C06DEE42FD1618BB99005ADCA2EC9D1E19' WITH GRANT OPTION |
| GRANT PROXY ON ''@'%' TO 'alice'@'localhost' WITH GRANT OPTION                                                                          |
+-----------------------------------------------------------------------------------------------------------------------------------------+

GRANT PROXY ON 'app1_dba'@'localhost' TO 'bob'@'localhost';
Query OK, 0 rows affected (0.004 sec)

GRANT PROXY ON 'app2_dba'@'localhost' TO 'carol'@'localhost';
Query OK, 0 rows affected (0.004 sec)

The default root user accounts created by mariadb-install-db have this privilege. For example:

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION;
GRANT PROXY ON ''@'%' TO 'root'@'localhost' WITH GRANT OPTION;

This allows the default root user accounts to grant the PROXY privilege for any other user account, and it also allows the default root user accounts to grant others the privilege to do the same.

Authentication Options

The authentication options for the GRANT statement are the same as those for the CREATE USER statement.

IDENTIFIED BY 'password'

The optional IDENTIFIED BY clause can be used to provide an account with a password. The password should be specified in plain text. It will be hashed by the PASSWORD function prior to being stored.

For example, if our password is mariadb, then we can create the user with:

GRANT USAGE ON *.* TO foo2@test IDENTIFIED BY 'mariadb';

If you do not specify a password with the IDENTIFIED BY clause, the user will be able to connect without a password. A blank password is not a wildcard to match any password. The user must connect without providing a password if no password is set.

If the user account already exists and if you provide the IDENTIFIED BY clause, then the user's password will be changed. You must have the privileges needed for the SET PASSWORD statement to change a user's password with GRANT.

The only authentication plugins that this clause supports are mysql_native_password and mysql_old_password.

IDENTIFIED BY PASSWORD 'password_hash'

The optional IDENTIFIED BY PASSWORD clause can be used to provide an account with a password that has already been hashed. The password should be specified as a hash that was provided by the PASSWORD function. It will be stored as-is.

For example, if our password is mariadb, then we can find the hash with:

SELECT PASSWORD('mariadb');
+-------------------------------------------+
| PASSWORD('mariadb')                       |
+-------------------------------------------+
| *54958E764CE10E50764C2EECBB71D01F08549980 |
+-------------------------------------------+
1 row in set (0.00 sec)

And then we can create a user with the hash:

GRANT USAGE ON *.* TO foo2@test IDENTIFIED BY 
  PASSWORD '*54958E764CE10E50764C2EECBB71D01F08549980';

If you do not specify a password with the IDENTIFIED BY clause, the user will be able to connect without a password. A blank password is not a wildcard to match any password. The user must connect without providing a password if no password is set.

If the user account already exists and if you provide the IDENTIFIED BY clause, then the user's password will be changed. You must have the privileges needed for the SET PASSWORD statement to change a user's password with GRANT.

The only authentication plugins that this clause supports are mysql_native_password and mysql_old_password.

IDENTIFIED {VIA|WITH} authentication_plugin

The optional IDENTIFIED VIA authentication_plugin allows you to specify that the account should be authenticated by a specific authentication plugin. The plugin name must be an active authentication plugin as per SHOW PLUGINS. If it doesn't show up in that output, then you will need to install it with INSTALL PLUGIN or INSTALL SONAME.

For example, this could be used with the PAM authentication plugin:

GRANT USAGE ON *.* TO foo2@test IDENTIFIED VIA pam;

Some authentication plugins allow additional arguments to be specified after a USING or AS keyword. For example, the PAM authentication plugin accepts a service name:

GRANT USAGE ON *.* TO foo2@test IDENTIFIED VIA pam USING 'mariadb';

The exact meaning of the additional argument would depend on the specific authentication plugin.

The USING or AS keyword can also be used to provide a plain-text password to a plugin if it's provided as an argument to the PASSWORD() function. This is only valid for authentication plugins that have implemented a hook for the PASSWORD() function. For example, the ed25519 authentication plugin supports this:

CREATE USER safe@'%' IDENTIFIED VIA ed25519 
  USING PASSWORD('secret');

One can specify many authentication plugins, they all work as alternative ways of authenticating a user:

CREATE USER safe@'%' IDENTIFIED VIA ed25519 
  USING PASSWORD('secret') OR unix_socket;

By default, when you create a user without specifying an authentication plugin, MariaDB uses the mysql_native_password plugin.

Resource Limit Options

It is possible to set per-account limits for certain server resources. The following table shows the values that can be set per account:

If any of these limits are set to 0, then there is no limit for that resource for that user.

To set resource limits for an account, if you do not want to change that account's privileges, you can issue a GRANT statement with the USAGE privilege, which has no meaning. The statement can name some or all limit types, in any order.

Here is an example showing how to set resource limits:

GRANT USAGE ON *.* TO 'someone'@'localhost' WITH
    MAX_USER_CONNECTIONS 0
    MAX_QUERIES_PER_HOUR 200;

The resources are tracked per account, which means 'user'@'server'; not per user name or per connection.

The count can be reset for all users using FLUSH USER_RESOURCES, FLUSH PRIVILEGES or mariadb-admin reload.

Users with the CONNECTION ADMIN privilege (in MariaDB 10.5.2 and later) or the SUPER privilege are not restricted by max_user_connections or max_password_errors and they are allowed one additional connection when max_connections is reached.

Per account resource limits are stored in the user table, in the mysql database. Columns used for resources limits are named max_questions, max_updates, max_connections (for MAX_CONNECTIONS_PER_HOUR), and max_user_connections (for MAX_USER_CONNECTIONS).

TLS Options

By default, MariaDB transmits data between the server and clients without encrypting it. This is generally acceptable when the server and client run on the same host or in networks where security is guaranteed through other means. However, in cases where the server and client exist on separate networks or they are in a high-risk network, the lack of encryption does introduce security concerns as a malicious actor could potentially eavesdrop on the traffic as it is sent over the network between them.

To mitigate this concern, MariaDB allows you to encrypt data in transit between the server and clients using the Transport Layer Security (TLS) protocol. TLS was formerly known as Secure Socket Layer (SSL), but strictly speaking the SSL protocol is a predecessor to TLS and, that version of the protocol is now considered insecure. The documentation still uses the term SSL often and for compatibility reasons TLS-related server system and status variables still use the prefix ssl_, but internally, MariaDB only supports its secure successors.

See Secure Connections Overview for more information about how to determine whether your MariaDB server has TLS support.

You can set certain TLS-related restrictions for specific user accounts. For instance, you might use this with user accounts that require access to sensitive data while sending it across networks that you do not control. These restrictions can be enabled for a user account with the CREATE USER, ALTER USER, or GRANT statements. The following options are available:

The REQUIRE keyword must be used only once for all specified options, and the AND keyword can be used to separate individual options, but it is not required.

For example, you can create a user account that requires these TLS options with the following:

GRANT USAGE ON *.* TO 'alice'@'%'
  REQUIRE SUBJECT '/CN=alice/O=My Dom, Inc./C=US/ST=Oregon/L=Portland'
  AND ISSUER '/C=FI/ST=Somewhere/L=City/ O=Some Company/CN=Peter Parker/emailAddress=p.parker@marvel.com'
  AND CIPHER 'SHA-DES-CBC3-EDH-RSA';

If any of these options are set for a specific user account, then any client who tries to connect with that user account will have to be configured to connect with TLS.

See Securing Connections for Client and Server for information on how to enable TLS on the client and server.

Roles

Syntax

GRANT role TO grantee [, grantee ... ]
[ WITH ADMIN OPTION ]

grantee:
    rolename
    username [authentication_option]

The GRANT statement is also used to grant the use of a role to one or more users or other roles. In order to be able to grant a role, the grantor doing so must have permission to do so (see WITH ADMIN in the CREATE ROLE article).

Specifying the WITH ADMIN OPTION permits the grantee to in turn grant the role to another.

For example, the following commands show how to grant the same role to a couple different users.

GRANT journalist TO hulda;

GRANT journalist TO berengar WITH ADMIN OPTION;

If a user has been granted a role, they do not automatically obtain all permissions associated with that role. These permissions are only in use when the user activates the role with the SET ROLE statement.

TO PUBLIC

GRANT <privilege> ON <database>.<object> TO PUBLIC;
REVOKE <privilege> ON <database>.<object> FROM PUBLIC;

Grant Examples

Granting Root-like Privileges

You can create a user that has privileges similar to the default root accounts by executing the following:

CREATE USER 'alexander'@'localhost';
GRANT ALL PRIVILEGES ON  *.* to 'alexander'@'localhost' WITH GRANT OPTION;

See Also

• Troubleshooting Connection Issues
• --skip-grant-tables allows you to start MariaDB without GRANT. This is useful if you lost your root password.
• CREATE USER
• ALTER USER
• DROP USER
• SET PASSWORD
• SHOW CREATE USER
• mysql.global_priv table
• mysql.user table
• Password Validation Plugins - permits the setting of basic criteria for passwords
• Authentication Plugins - allow various authentication methods to be used, and new ones to be developed.