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sql_acl.h
#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 */
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