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#ifndef SQL_ACL_INCLUDED
#define SQL_ACL_INCLUDED
/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2017, 2020, MariaDB Corporation.
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 */
#include "violite.h" /* SSL_type */
#include "sql_class.h" /* LEX_COLUMN */
#include "grant.h"
#include "sql_cmd.h" /* Sql_cmd */
enum mysql_db_table_field
{
MYSQL_DB_FIELD_HOST = 0,
MYSQL_DB_FIELD_DB,
MYSQL_DB_FIELD_USER,
MYSQL_DB_FIELD_SELECT_PRIV,
MYSQL_DB_FIELD_INSERT_PRIV,
MYSQL_DB_FIELD_UPDATE_PRIV,
MYSQL_DB_FIELD_DELETE_PRIV,
MYSQL_DB_FIELD_CREATE_PRIV,
MYSQL_DB_FIELD_DROP_PRIV,
MYSQL_DB_FIELD_GRANT_PRIV,
MYSQL_DB_FIELD_REFERENCES_PRIV,
MYSQL_DB_FIELD_INDEX_PRIV,
MYSQL_DB_FIELD_ALTER_PRIV,
MYSQL_DB_FIELD_CREATE_TMP_TABLE_PRIV,
MYSQL_DB_FIELD_LOCK_TABLES_PRIV,
MYSQL_DB_FIELD_CREATE_VIEW_PRIV,
MYSQL_DB_FIELD_SHOW_VIEW_PRIV,
MYSQL_DB_FIELD_CREATE_ROUTINE_PRIV,
MYSQL_DB_FIELD_ALTER_ROUTINE_PRIV,
MYSQL_DB_FIELD_EXECUTE_PRIV,
MYSQL_DB_FIELD_EVENT_PRIV,
MYSQL_DB_FIELD_TRIGGER_PRIV,
MYSQL_DB_FIELD_DELETE_VERSIONING_ROWS_PRIV,
MYSQL_DB_FIELD_COUNT
};
extern const TABLE_FIELD_DEF mysql_db_table_def;
extern bool mysql_user_table_is_in_short_password_format;
extern LEX_CSTRING host_not_specified;
extern LEX_CSTRING current_user;
extern LEX_CSTRING current_role;
extern LEX_CSTRING current_user_and_current_role;
static inline int access_denied_error_code(int passwd_used)
{
#ifdef mysqld_error_find_printf_error_used
return 0;
#else
return passwd_used == 2 ? ER_ACCESS_DENIED_NO_PASSWORD_ERROR
: ER_ACCESS_DENIED_ERROR;
#endif
}
/* prototypes */
bool hostname_requires_resolving(const char *hostname);
bool acl_init(bool dont_read_acl_tables);
bool acl_reload(THD *thd);
void acl_free(bool end=0);
privilege_t acl_get(const char *host, const char *ip,
const char *user, const char *db, my_bool db_is_pattern);
bool acl_authenticate(THD *thd, uint com_change_user_pkt_len);
bool acl_getroot(Security_context *sctx, const char *user, const char *host,
const char *ip, const char *db);
bool acl_check_host(const char *host, const char *ip);
bool check_change_password(THD *thd, LEX_USER *user);
bool change_password(THD *thd, LEX_USER *user);
bool mysql_grant_role(THD *thd, List<LEX_USER> &user_list, bool revoke);
bool mysql_grant(THD *thd, const char *db, List <LEX_USER> &user_list,
privilege_t rights, bool revoke, bool is_proxy);
int mysql_table_grant(THD *thd, TABLE_LIST *table, List <LEX_USER> &user_list,
List <LEX_COLUMN> &column_list, privilege_t rights,
bool revoke);
bool mysql_routine_grant(THD *thd, TABLE_LIST *table, const Sp_handler *sph,
List <LEX_USER> &user_list, privilege_t rights,
bool revoke, bool write_to_binlog);
bool grant_init();
void grant_free(void);
bool grant_reload(THD *thd);
bool check_grant(THD *thd, privilege_t want_access, TABLE_LIST *tables,
bool any_combination_will_do, uint number, bool no_errors);
bool check_grant_column (THD *thd, GRANT_INFO *grant,
const char *db_name, const char *table_name,
const char *name, size_t length, Security_context *sctx);
bool check_column_grant_in_table_ref(THD *thd, TABLE_LIST * table_ref,
const char *name, size_t length, Field *fld);
bool check_grant_all_columns(THD *thd, privilege_t want_access,
Field_iterator_table_ref *fields);
bool check_grant_routine(THD *thd, privilege_t want_access,
TABLE_LIST *procs, const Sp_handler *sph,
bool no_error);
bool check_grant_db(THD *thd,const char *db);
bool check_global_access(THD *thd, const privilege_t want_access, bool no_errors= false);
bool check_access(THD *thd, privilege_t want_access,
const char *db, privilege_t *save_priv,
GRANT_INTERNAL_INFO *grant_internal_info,
bool dont_check_global_grants, bool no_errors);
privilege_t get_table_grant(THD *thd, TABLE_LIST *table);
privilege_t get_column_grant(THD *thd, GRANT_INFO *grant,
const char *db_name, const char *table_name,
const char *field_name);
bool get_show_user(THD *thd, LEX_USER *lex_user, const char **username,
const char **hostname, const char **rolename);
void mysql_show_grants_get_fields(THD *thd, List<Item> *fields,
const char *name, size_t length);
bool mysql_show_grants(THD *thd, LEX_USER *user);
bool mysql_show_create_user(THD *thd, LEX_USER *user);
int fill_schema_enabled_roles(THD *thd, TABLE_LIST *tables, COND *cond);
int fill_schema_applicable_roles(THD *thd, TABLE_LIST *tables, COND *cond);
void get_privilege_desc(char *to, uint max_length, privilege_t access);
void get_mqh(const char *user, const char *host, USER_CONN *uc);
bool mysql_create_user(THD *thd, List <LEX_USER> &list, bool handle_as_role);
bool mysql_drop_user(THD *thd, List <LEX_USER> &list, bool handle_as_role);
bool mysql_rename_user(THD *thd, List <LEX_USER> &list);
int mysql_alter_user(THD *thd, List <LEX_USER> &list);
bool mysql_revoke_all(THD *thd, List <LEX_USER> &list);
void fill_effective_table_privileges(THD *thd, GRANT_INFO *grant,
const char *db, const char *table);
bool sp_revoke_privileges(THD *thd, const char *sp_db, const char *sp_name,
const Sp_handler *sph);
bool sp_grant_privileges(THD *thd, const char *sp_db, const char *sp_name,
const Sp_handler *sph);
bool check_routine_level_acl(THD *thd, const char *db, const char *name,
const Sp_handler *sph);
bool is_acl_user(const char *host, const char *user);
int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr);
/**
Result of an access check for an internal schema or table.
Internal ACL checks are always performed *before* using
the grant tables.
This mechanism enforces that the server implementation has full
control on its internal tables.
Depending on the internal check result, the server implementation
can choose to:
- always allow access,
- always deny access,
- delegate the decision to the database administrator,
by using the grant tables.
*/
enum ACL_internal_access_result
{
/**
Access granted for all the requested privileges,
do not use the grant tables.
*/
ACL_INTERNAL_ACCESS_GRANTED,
/** Access denied, do not use the grant tables. */
ACL_INTERNAL_ACCESS_DENIED,
/** No decision yet, use the grant tables. */
ACL_INTERNAL_ACCESS_CHECK_GRANT
};
/**
Per internal table ACL access rules.
This class is an interface.
Per table(s) specific access rule should be implemented in a subclass.
@sa ACL_internal_schema_access
*/
class ACL_internal_table_access
{
public:
ACL_internal_table_access() = default;
virtual ~ACL_internal_table_access() = default;
/**
Check access to an internal table.
When a privilege is granted, this method add the requested privilege
to save_priv.
@param want_access the privileges requested
@param [in, out] save_priv the privileges granted
@return
@retval ACL_INTERNAL_ACCESS_GRANTED All the requested privileges
are granted, and saved in save_priv.
@retval ACL_INTERNAL_ACCESS_DENIED At least one of the requested
privileges was denied.
@retval ACL_INTERNAL_ACCESS_CHECK_GRANT No requested privilege
was denied, and grant should be checked for at least one
privilege. Requested privileges that are granted, if any, are saved
in save_priv.
*/
virtual ACL_internal_access_result check(privilege_t want_access,
privilege_t *save_priv) const= 0;
};
/**
Per internal schema ACL access rules.
This class is an interface.
Each per schema specific access rule should be implemented
in a different subclass, and registered.
Per schema access rules can control:
- every schema privileges on schema.*
- every table privileges on schema.table
@sa ACL_internal_schema_registry
*/
class ACL_internal_schema_access
{
public:
ACL_internal_schema_access() = default;
virtual ~ACL_internal_schema_access() = default;
/**
Check access to an internal schema.
@param want_access the privileges requested
@param [in, out] save_priv the privileges granted
@return
@retval ACL_INTERNAL_ACCESS_GRANTED All the requested privileges
are granted, and saved in save_priv.
@retval ACL_INTERNAL_ACCESS_DENIED At least one of the requested
privileges was denied.
@retval ACL_INTERNAL_ACCESS_CHECK_GRANT No requested privilege
was denied, and grant should be checked for at least one
privilege. Requested privileges that are granted, if any, are saved
in save_priv.
*/
virtual ACL_internal_access_result check(privilege_t want_access,
privilege_t *save_priv) const= 0;
/**
Search for per table ACL access rules by table name.
@param name the table name
@return per table access rules, or NULL
*/
virtual const ACL_internal_table_access *lookup(const char *name) const= 0;
};
/**
A registry for per internal schema ACL.
An 'internal schema' is a database schema maintained by the
server implementation, such as 'performance_schema' and 'INFORMATION_SCHEMA'.
*/
class ACL_internal_schema_registry
{
public:
static void register_schema(const LEX_CSTRING *name,
const ACL_internal_schema_access *access);
static const ACL_internal_schema_access *lookup(const char *name);
};
const ACL_internal_schema_access *
get_cached_schema_access(GRANT_INTERNAL_INFO *grant_internal_info,
const char *schema_name);
const ACL_internal_table_access *
get_cached_table_access(GRANT_INTERNAL_INFO *grant_internal_info,
const char *schema_name,
const char *table_name);
bool acl_check_proxy_grant_access (THD *thd, const char *host, const char *user,
bool with_grant);
int acl_setrole(THD *thd, const char *rolename, privilege_t access);
int acl_check_setrole(THD *thd, const char *rolename, privilege_t *access);
int acl_check_set_default_role(THD *thd, const char *host, const char *user,
const char *role);
int acl_set_default_role(THD *thd, const char *host, const char *user,
const char *rolename);
extern SHOW_VAR acl_statistics[];
/* Check if a role is granted to a user/role.
If hostname == NULL, search for a role as the starting grantee.
*/
bool check_role_is_granted(const char *username,
const char *hostname,
const char *rolename);
#ifndef DBUG_OFF
extern ulong role_global_merges, role_db_merges, role_table_merges,
role_column_merges, role_routine_merges;
#endif
class Sql_cmd_grant: public Sql_cmd
{
protected:
enum_sql_command m_command;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
void warn_hostname_requires_resolving(THD *thd, List<LEX_USER> &list);
bool user_list_reset_mqh(THD *thd, List<LEX_USER> &list);
void grant_stage0(THD *thd);
#endif
public:
Sql_cmd_grant(enum_sql_command command)
:m_command(command)
{ }
bool is_revoke() const { return m_command == SQLCOM_REVOKE; }
enum_sql_command sql_command_code() const override { return m_command; }
};
class Sql_cmd_grant_proxy: public Sql_cmd_grant
{
privilege_t m_grant_option;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bool check_access_proxy(THD *thd, List<LEX_USER> &list);
#endif
public:
Sql_cmd_grant_proxy(enum_sql_command command, privilege_t grant_option)
:Sql_cmd_grant(command), m_grant_option(grant_option)
{ }
bool execute(THD *thd) override;
};
class Sql_cmd_grant_object: public Sql_cmd_grant, public Grant_privilege
{
protected:
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bool grant_stage0_exact_object(THD *thd, TABLE_LIST *table);
#endif
public:
Sql_cmd_grant_object(enum_sql_command command, const Grant_privilege &grant)
:Sql_cmd_grant(command), Grant_privilege(grant)
{ }
};
class Sql_cmd_grant_table: public Sql_cmd_grant_object
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bool execute_table_mask(THD *thd);
bool execute_exact_table(THD *thd, TABLE_LIST *table);
#endif
public:
Sql_cmd_grant_table(enum_sql_command command, const Grant_privilege &grant)
:Sql_cmd_grant_object(command, grant)
{ }
bool execute(THD *thd) override;
};
class Sql_cmd_grant_sp: public Sql_cmd_grant_object
{
const Sp_handler &m_sph;
public:
Sql_cmd_grant_sp(enum_sql_command command, const Grant_privilege &grant,
const Sp_handler &sph)
:Sql_cmd_grant_object(command, grant),
m_sph(sph)
{ }
bool execute(THD *thd) override;
};
#endif /* SQL_ACL_INCLUDED */