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/* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#include "sql_base.h" /* open_normal_and_derived_tables */
#include "sql_table.h" /* build_table_filename */
#include "sql_show.h" /* append_identifier */
#include "sql_view.h" /* VIEW_ANY_ACL */
#include "rpl_filter.h" /* rpl_filter */
#include "sql_parse.h" /* get_current_user */
/* any_db */
#include "binlog.h" /* mysql_bin_log */
#include "sp.h" /* sp_exist_routines */
#include "sql_insert.h" /* Sql_cmd_insert_base */
#include "log.h" /* sql_print_warning */
#include "sql_update.h"
#include "auth_internal.h"
#include "sql_auth_cache.h"
#include "sql_authentication.h"
#include "sql_authorization.h"
#include "debug_sync.h"
#include "sql_user_table.h"
const char *command_array[]=
{
"SELECT", "INSERT", "UPDATE", "DELETE", "CREATE", "DROP", "RELOAD",
"SHUTDOWN", "PROCESS","FILE", "GRANT", "REFERENCES", "INDEX",
"ALTER", "SHOW DATABASES", "SUPER", "CREATE TEMPORARY TABLES",
"LOCK TABLES", "EXECUTE", "REPLICATION SLAVE", "REPLICATION CLIENT",
"CREATE VIEW", "SHOW VIEW", "CREATE ROUTINE", "ALTER ROUTINE",
"CREATE USER", "EVENT", "TRIGGER", "CREATE TABLESPACE"
};
uint command_lengths[]=
{
6, 6, 6, 6, 6, 4, 6, 8, 7, 4, 5, 10, 5, 5, 14, 5, 23, 11, 7, 17, 18, 11, 9,
14, 13, 11, 5, 7, 17
};
const char *any_db="*any*"; // Special symbol for check_access
static bool check_show_access(THD *thd, TABLE_LIST *table);
/**
Get a cached internal schema access.
@param grant_internal_info the cache
@param schema_name the name of the internal schema
*/
const ACL_internal_schema_access *
get_cached_schema_access(GRANT_INTERNAL_INFO *grant_internal_info,
const char *schema_name)
{
if (grant_internal_info)
{
if (! grant_internal_info->m_schema_lookup_done)
{
grant_internal_info->m_schema_access=
ACL_internal_schema_registry::lookup(schema_name);
grant_internal_info->m_schema_lookup_done= TRUE;
}
return grant_internal_info->m_schema_access;
}
return ACL_internal_schema_registry::lookup(schema_name);
}
/**
Get a cached internal table access.
@param grant_internal_info the cache
@param schema_name the name of the internal schema
@param table_name the name of the internal table
*/
const ACL_internal_table_access *
get_cached_table_access(GRANT_INTERNAL_INFO *grant_internal_info,
const char *schema_name,
const char *table_name)
{
DBUG_ASSERT(grant_internal_info);
if (! grant_internal_info->m_table_lookup_done)
{
const ACL_internal_schema_access *schema_access;
schema_access= get_cached_schema_access(grant_internal_info, schema_name);
if (schema_access)
grant_internal_info->m_table_access= schema_access->lookup(table_name);
grant_internal_info->m_table_lookup_done= TRUE;
}
return grant_internal_info->m_table_access;
}
ACL_internal_access_result
IS_internal_schema_access::check(ulong want_access,
ulong *save_priv) const
{
want_access &= ~SELECT_ACL;
/*
We don't allow any simple privileges but SELECT_ACL on
the information_schema database.
*/
if (unlikely(want_access & DB_ACLS))
return ACL_INTERNAL_ACCESS_DENIED;
/* Always grant SELECT for the information schema. */
*save_priv|= SELECT_ACL;
return want_access ? ACL_INTERNAL_ACCESS_CHECK_GRANT :
ACL_INTERNAL_ACCESS_GRANTED;
}
const ACL_internal_table_access *
IS_internal_schema_access::lookup(const char *name) const
{
/* There are no per table rules for the information schema. */
return NULL;
}
/**
Perform first stage of privilege checking for SELECT statement.
@param thd Thread context.
@param lex LEX for SELECT statement.
@param tables List of tables used by statement.
@param first_table First table in the main SELECT of the SELECT
statement.
@retval FALSE - Success (column-level privilege checks might be required).
@retval TRUE - Failure, privileges are insufficient.
*/
bool select_precheck(THD *thd, LEX *lex, TABLE_LIST *tables,
TABLE_LIST *first_table)
{
bool res;
/*
lex->exchange != NULL implies SELECT .. INTO OUTFILE and this
requires FILE_ACL access.
*/
ulong privileges_requested= lex->exchange ? SELECT_ACL | FILE_ACL :
SELECT_ACL;
if (tables)
{
res= check_table_access(thd,
privileges_requested,
tables, FALSE, UINT_MAX, FALSE) ||
(first_table && first_table->schema_table_reformed &&
check_show_access(thd, first_table));
}
else
res= check_access(thd, privileges_requested, any_db, NULL, NULL, 0, 0);
return res;
}
/**
Multi update query pre-check.
@param thd Thread handler
@param tables Global/local table list (have to be the same)
@retval
FALSE OK
@retval
TRUE Error
*/
bool Sql_cmd_update::multi_update_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("multi_update_precheck");
/*
Ensure that we have UPDATE or SELECT privilege for each table
The exact privilege is checked in mysql_multi_update()
*/
for (TABLE_LIST *table= tables; table; table= table->next_global)
{
/*
"uses_materialization()" covers the case where a prepared statement is
executed and a view is decided to be materialized during preparation.
*/
if (table->is_derived() || table->uses_materialization())
table->grant.privilege= SELECT_ACL;
else if ((check_access(thd, UPDATE_ACL, table->db,
&table->grant.privilege,
&table->grant.m_internal,
0, 1) ||
check_grant(thd, UPDATE_ACL, table, FALSE, 1, TRUE)) &&
(check_access(thd, SELECT_ACL, table->db,
&table->grant.privilege,
&table->grant.m_internal,
0, 0) ||
check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE)))
DBUG_RETURN(TRUE);
table->table_in_first_from_clause= 1;
}
DBUG_RETURN(FALSE);
}
/**
Multi delete query pre-check.
@param thd Thread handler
@param tables Global/local table list
@retval
FALSE OK
@retval
TRUE error
*/
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
{
SELECT_LEX *select_lex= thd->lex->select_lex;
TABLE_LIST *aux_tables= thd->lex->auxiliary_table_list.first;
TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
DBUG_ENTER("multi_delete_precheck");
/* sql_yacc guarantees that tables and aux_tables are not zero */
DBUG_ASSERT(aux_tables != 0);
if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
DBUG_RETURN(TRUE);
/*
Since aux_tables list is not part of LEX::query_tables list we
have to juggle with LEX::query_tables_own_last value to be able
call check_table_access() safely.
*/
thd->lex->query_tables_own_last= 0;
if (check_table_access(thd, DELETE_ACL, aux_tables, FALSE, UINT_MAX, FALSE))
{
thd->lex->query_tables_own_last= save_query_tables_own_last;
DBUG_RETURN(TRUE);
}
thd->lex->query_tables_own_last= save_query_tables_own_last;
if ((thd->variables.option_bits & OPTION_SAFE_UPDATES) &&
!select_lex->where_cond())
{
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/**
simple UPDATE query pre-check.
@param thd Thread handler
@param tables Global table list
@retval
FALSE OK
@retval
TRUE Error
*/
bool Sql_cmd_update::update_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("update_precheck");
const bool res= check_one_table_access(thd, UPDATE_ACL, tables);
DBUG_RETURN(res);
}
/**
simple DELETE query pre-check.
@param thd Thread handler
@param tables Global table list
@retval
FALSE OK
@retval
TRUE error
*/
bool delete_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("delete_precheck");
if (check_one_table_access(thd, DELETE_ACL, tables))
DBUG_RETURN(TRUE);
/* Set privilege for the WHERE clause */
tables->set_want_privilege(SELECT_ACL);
DBUG_RETURN(FALSE);
}
/**
simple INSERT query pre-check.
@param thd Thread handler
@param tables Global table list
@retval
FALSE OK
@retval
TRUE error
*/
bool Sql_cmd_insert_base::insert_precheck(THD *thd, TABLE_LIST *tables)
{
LEX *lex= thd->lex;
DBUG_ENTER("insert_precheck");
/*
Check that we have modify privileges for the first table and
select privileges for the rest
*/
ulong privilege= (INSERT_ACL |
(lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
(insert_value_list.elements ? UPDATE_ACL : 0));
if (check_one_table_access(thd, privilege, tables))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/**
Check privileges for LOCK TABLES statement.
@param thd Thread context.
@param tables List of tables to be locked.
@retval FALSE - Success.
@retval TRUE - Failure.
*/
bool lock_tables_precheck(THD *thd, TABLE_LIST *tables)
{
TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
for (TABLE_LIST *table= tables; table != first_not_own_table && table;
table= table->next_global)
{
if (is_temporary_table(table))
continue;
if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, table,
FALSE, 1, FALSE))
return TRUE;
}
return FALSE;
}
/**
CREATE TABLE query pre-check.
@param thd Thread handler
@param tables Global table list
@param create_table Table which will be created
@retval
FALSE OK
@retval
TRUE Error
*/
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
TABLE_LIST *create_table)
{
LEX *lex= thd->lex;
SELECT_LEX *select_lex= lex->select_lex;
ulong want_priv;
bool error= TRUE; // Error message is given
DBUG_ENTER("create_table_precheck");
/*
Require CREATE [TEMPORARY] privilege on new table; for
CREATE TABLE ... SELECT, also require INSERT.
*/
want_priv= (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
CREATE_TMP_ACL :
(CREATE_ACL | (select_lex->item_list.elements ? INSERT_ACL : 0));
if (check_access(thd, want_priv, create_table->db,
&create_table->grant.privilege,
&create_table->grant.m_internal,
0, 0))
goto err;
/* If it is a merge table, check privileges for merge children. */
if (lex->create_info.merge_list.first)
{
/*
The user must have (SELECT_ACL | UPDATE_ACL | DELETE_ACL) on the
underlying base tables, even if there are temporary tables with the same
names.
From user's point of view, it might look as if the user must have these
privileges on temporary tables to create a merge table over them. This is
one of two cases when a set of privileges is required for operations on
temporary tables (see also CREATE TABLE).
The reason for this behavior stems from the following facts:
- For merge tables, the underlying table privileges are checked only
at CREATE TABLE / ALTER TABLE time.
In other words, once a merge table is created, the privileges of
the underlying tables can be revoked, but the user will still have
access to the merge table (provided that the user has privileges on
the merge table itself).
- Temporary tables shadow base tables.
I.e. there might be temporary and base tables with the same name, and
the temporary table takes the precedence in all operations.
- For temporary MERGE tables we do not track if their child tables are
base or temporary. As result we can't guarantee that privilege check
which was done in presence of temporary child will stay relevant later
as this temporary table might be removed.
If SELECT_ACL | UPDATE_ACL | DELETE_ACL privileges were not checked for
the underlying *base* tables, it would create a security breach as in
Bug#12771903.
*/
if (check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
lex->create_info.merge_list.first,
FALSE, UINT_MAX, FALSE))
goto err;
}
if (want_priv != CREATE_TMP_ACL &&
check_grant(thd, want_priv, create_table, FALSE, 1, FALSE))
goto err;
if (select_lex->item_list.elements)
{
/* Check permissions for used tables in CREATE TABLE ... SELECT */
if (tables && check_table_access(thd, SELECT_ACL, tables, FALSE,
UINT_MAX, FALSE))
goto err;
}
else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
{
if (check_table_access(thd, SELECT_ACL, tables, FALSE, UINT_MAX, FALSE))
goto err;
}
if (check_fk_parent_table_access(thd, create_table->db,
&lex->create_info, &lex->alter_info))
goto err;
error= FALSE;
err:
DBUG_RETURN(error);
}
/**
@brief Performs standardized check whether to prohibit (TRUE)
or allow (FALSE) operations based on read_only and super_read_only
state.
@param thd Thread handler
@param err_if_readonly Boolean indicating whether or not
to add the error to the thread context if read-only is
violated.
@returns Status code
@retval TRUE The operation should be prohibited.
@ retval FALSE The operation should be allowed.
*/
bool check_readonly(THD *thd, bool err_if_readonly)
{
DBUG_ENTER("check_readonly");
/* read_only=OFF, do not prohibit operation: */
if (!opt_readonly)
DBUG_RETURN(FALSE);
/*
Thread is replication slave or skip_read_only check is enabled for the
command, do not prohibit operation.
*/
if (thd->slave_thread || thd->is_cmd_skip_readonly())
DBUG_RETURN(FALSE);
bool is_super = thd->security_context()->check_access(SUPER_ACL);
/* super_read_only=OFF and user has SUPER privilege,
do not prohibit operation:
*/
if (is_super && !opt_super_readonly)
DBUG_RETURN(FALSE);
/* throw error in standardized way if requested: */
if (err_if_readonly)
err_readonly(thd);
/* in all other cases, prohibit operation: */
DBUG_RETURN(TRUE);
}
/**
@brief Generates appropriate error messages for read-only state
depending on whether user has SUPER privilege or not.
@param thd Thread handler
*/
void err_readonly(THD *thd)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0),
thd->security_context()->check_access(SUPER_ACL) ?
"--super-read-only" : "--read-only");
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
Wrapper class which simplifies read guard usage for LOCK_grant.
*/
class LOCK_grant_read_guard : public Partitioned_rwlock_read_guard
{
public:
explicit LOCK_grant_read_guard(THD *thd)
: Partitioned_rwlock_read_guard(&LOCK_grant, thd->thread_id())
{ }
};
/**
Check grants for commands which work only with one table and all other
tables belonging to subselects or implicitly opened tables.
@param thd Thread handler
@param privilege requested privilege
@param all_tables global table list of query
@returns false on success, true on access denied error
*/
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
if (check_single_table_access(thd, privilege, all_tables, false))
return true;
// Check privileges on tables from subqueries and implicitly opened tables
TABLE_LIST *subquery_table;
TABLE_LIST *const view= all_tables->is_view() ? all_tables : NULL;
if ((subquery_table= all_tables->next_global))
{
/*
Access rights asked for the first table of a view should be the same
as for the view
*/
if (view && subquery_table->belong_to_view == view)
{
if (check_single_table_access(thd, privilege, subquery_table, false))
return true; /* purecov: inspected */
subquery_table= subquery_table->next_global;
}
if (subquery_table &&
check_table_access(thd, SELECT_ACL, subquery_table, false,
UINT_MAX, false))
return true;
}
return false;
}
/**
Check grants for commands which work only with one table.
@param thd Thread handler
@param privilege requested privilege
@param all_tables global table list of query
@param no_errors FALSE/TRUE - report/don't report error to
the client (using my_error() call).
@retval
0 OK
@retval
1 access denied, error is sent to client
*/
bool check_single_table_access(THD *thd, ulong privilege,
TABLE_LIST *all_tables, bool no_errors)
{
Security_context *backup_ctx= thd->security_context();
/* we need to switch to the saved context (if any) */
if (all_tables->security_ctx)
thd->set_security_context(all_tables->security_ctx);
const char *db_name;
if ((all_tables->is_view() || all_tables->field_translation) &&
!all_tables->schema_table)
db_name= all_tables->view_db.str;
else
db_name= all_tables->db;
if (check_access(thd, privilege, db_name,
&all_tables->grant.privilege,
&all_tables->grant.m_internal,
0, no_errors))
goto deny;
/* Show only 1 table for check_grant */
if (!(all_tables->belong_to_view &&
(thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
check_grant(thd, privilege, all_tables, FALSE, 1, no_errors))
goto deny;
thd->set_security_context(backup_ctx);
return 0;
deny:
thd->set_security_context(backup_ctx);
return 1;
}
bool
check_routine_access(THD *thd, ulong want_access, const char *db, char *name,
bool is_proc, bool no_errors)
{
TABLE_LIST tables[1];
memset(tables, 0, sizeof(TABLE_LIST));
tables->db= db;
tables->table_name= tables->alias= name;
/*
The following test is just a shortcut for check_access() (to avoid
calculating db_access) under the assumption that it's common to
give persons global right to execute all stored SP (but not
necessary to create them).
Note that this effectively bypasses the ACL_internal_schema_access checks
that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
which are located in check_access().
Since the I_S and P_S do not contain routines, this bypass is ok,
as long as this code path is not abused to create routines.
The assert enforce that.
*/
DBUG_ASSERT((want_access & CREATE_PROC_ACL) == 0);
if (thd->security_context()->check_access(want_access))
tables->grant.privilege= want_access;
else if (check_access(thd, want_access, db,
&tables->grant.privilege,
&tables->grant.m_internal,
0, no_errors))
return TRUE;
return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
}
/**
Check if the given table has any of the asked privileges
@param thd Thread handler
@param want_access Bitmap of possible privileges to check for
@retval
0 ok
@retval
1 error
*/
bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
ulong access;
DBUG_ENTER("check_some_access");
/* This loop will work as long as we have less than 32 privileges */
for (access= 1; access < want_access ; access<<= 1)
{
if (access & want_access)
{
if (!check_access(thd, access, table->db,
&table->grant.privilege,
&table->grant.m_internal,
0, 1) &&
!check_grant(thd, access, table, FALSE, 1, TRUE))
DBUG_RETURN(0);
}
}
DBUG_PRINT("exit",("no matching access rights"));
DBUG_RETURN(1);
}
/**
Check if the routine has any of the routine privileges.
@param thd Thread handler
@param db Database name
@param name Routine name
@retval
0 ok
@retval
1 error
*/
bool check_some_routine_access(THD *thd, const char *db, const char *name,
bool is_proc)
{
ulong save_priv;
/*
The following test is just a shortcut for check_access() (to avoid
calculating db_access)
Note that this effectively bypasses the ACL_internal_schema_access checks
that are implemented for the INFORMATION_SCHEMA and PERFORMANCE_SCHEMA,
which are located in check_access().
Since the I_S and P_S do not contain routines, this bypass is ok,
as it only opens SHOW_PROC_ACLS.
*/
if (thd->security_context()->check_access(SHOW_PROC_ACLS, true))
return FALSE;
if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, NULL, 0, 1) ||
(save_priv & SHOW_PROC_ACLS))
return FALSE;
return check_routine_level_acl(thd, db, name, is_proc);
}
/**
@brief Compare requested privileges with the privileges acquired from the
User- and Db-tables.
@param thd Thread handler
@param want_access The requested access privileges.
@param db A pointer to the Db name.
@param[out] save_priv A pointer to the granted privileges will be stored.
@param grant_internal_info A pointer to the internal grant cache.
@param dont_check_global_grants True if no global grants are checked.
@param no_error True if no errors should be sent to the client.
'save_priv' is used to save the User-table (global) and Db-table grants for
the supplied db name. Note that we don't store db level grants if the global
grants is enough to satisfy the request AND the global grants contains a
SELECT grant.
For internal databases (INFORMATION_SCHEMA, PERFORMANCE_SCHEMA),
additional rules apply, see ACL_internal_schema_access.
@see check_grant
@return Status of denial of access by exclusive ACLs.
@retval FALSE Access can't exclusively be denied by Db- and User-table
access unless Column- and Table-grants are checked too.
@retval TRUE Access denied.
*/
bool
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
GRANT_INTERNAL_INFO *grant_internal_info,
bool dont_check_global_grants, bool no_errors)
{
Security_context *sctx= thd->security_context();
ulong db_access;
/*
GRANT command:
In case of database level grant the database name may be a pattern,
in case of table|column level grant the database name can not be a pattern.
We use 'dont_check_global_grants' as a flag to determine
if it's database level grant command
(see SQLCOM_GRANT case, mysql_execute_command() function) and
set db_is_pattern according to 'dont_check_global_grants' value.
*/
bool db_is_pattern= ((want_access & GRANT_ACL) && dont_check_global_grants);
ulong dummy;
DBUG_ENTER("check_access");
DBUG_PRINT("enter",("db: %s want_access: %lu master_access: %lu",
db ? db : "", want_access, sctx->master_access()));
if (save_priv)
*save_priv=0;
else
{
save_priv= &dummy;
dummy= 0;
}
THD_STAGE_INFO(thd, stage_checking_permissions);
if ((!db || !db[0]) && !thd->db().str && !dont_check_global_grants)
{
DBUG_PRINT("error",("No database"));
if (!no_errors)
my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
MYF(0)); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
}
if ((db != NULL) && (db != any_db))
{
const ACL_internal_schema_access *access;
access= get_cached_schema_access(grant_internal_info, db);
if (access)
{
switch (access->check(want_access, save_priv))
{
case ACL_INTERNAL_ACCESS_GRANTED:
/*
All the privileges requested have been granted internally.
[out] *save_privileges= Internal privileges.
*/
DBUG_RETURN(FALSE);
case ACL_INTERNAL_ACCESS_DENIED:
if (! no_errors)
{
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user().str, sctx->priv_host().str, db);
}
DBUG_RETURN(TRUE);
case ACL_INTERNAL_ACCESS_CHECK_GRANT:
/*
Only some of the privilege requested have been granted internally,
proceed with the remaining bits of the request (want_access).
*/
want_access&= ~(*save_priv);
break;
}
}
}
if (sctx->check_access(want_access))
{
/*
1. If we don't have a global SELECT privilege, we have to get the
database specific access rights to be able to handle queries of type
UPDATE t1 SET a=1 WHERE b > 0
2. Change db access if it isn't current db which is being addressed
*/
if (!(sctx->check_access(SELECT_ACL)))
{
if (db && (!thd->db().str || db_is_pattern ||
strcmp(db, thd->db().str)))
db_access= acl_get(sctx->host().str, sctx->ip().str,
sctx->priv_user().str, db, db_is_pattern);
else
{
/* get access for current db */
db_access= sctx->db_access();
}
/*
The effective privileges are the union of the global privileges
and the intersection of db- and host-privileges,
plus the internal privileges.
*/
*save_priv|= sctx->master_access() | db_access;
}
else
*save_priv|= sctx->master_access();
DBUG_RETURN(FALSE);
}
if (((want_access & ~sctx->master_access()) & ~DB_ACLS) ||
(! db && dont_check_global_grants))
{ // We can never grant this
DBUG_PRINT("error",("No possible access"));
if (!no_errors)
{
if (thd->password == 2)
my_error(ER_ACCESS_DENIED_NO_PASSWORD_ERROR, MYF(0),
sctx->priv_user().str,
sctx->priv_host().str);
else
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user().str,
sctx->priv_host().str,
(thd->password ?
ER(ER_YES) :
ER(ER_NO))); /* purecov: tested */
}
DBUG_RETURN(TRUE); /* purecov: tested */
}
if (db == any_db)
{
/*
Access granted; Allow select on *any* db.
[out] *save_privileges= 0
*/
DBUG_RETURN(FALSE);
}
if (db && (!thd->db().str || db_is_pattern || strcmp(db,thd->db().str)))
db_access= acl_get(sctx->host().str, sctx->ip().str,
sctx->priv_user().str, db, db_is_pattern);
else
db_access= sctx->db_access();
DBUG_PRINT("info",("db_access: %lu want_access: %lu",
db_access, want_access));
/*
Save the union of User-table and the intersection between Db-table and
Host-table privileges, with the already saved internal privileges.
*/
db_access= (db_access | sctx->master_access());
*save_priv|= db_access;
/*
We need to investigate column- and table access if all requested privileges
belongs to the bit set of .
*/
bool need_table_or_column_check=
(want_access & (TABLE_ACLS | PROC_ACLS | db_access)) == want_access;
/*
Grant access if the requested access is in the intersection of
host- and db-privileges (as retrieved from the acl cache),
also grant access if all the requested privileges are in the union of
TABLES_ACLS and PROC_ACLS; see check_grant.
*/
if ( (db_access & want_access) == want_access ||
(!dont_check_global_grants &&
need_table_or_column_check))
{
/*
Ok; but need to check table- and column privileges.
[out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
*/
DBUG_RETURN(FALSE);
}
/*
Access is denied;
[out] *save_privileges is (User-priv | (Db-priv & Host-priv) | Internal-priv)
*/
DBUG_PRINT("error",("Access denied"));
if (!no_errors)
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
sctx->priv_user().str, sctx->priv_host().str,
(db ? db : (thd->db().str ?
thd->db().str :
"unknown")));
DBUG_RETURN(TRUE);
}
/**
@brief Check if the requested privileges exists in either User-, Host- or
Db-tables.
@param thd Thread context
@param want_access Privileges requested
@param tables List of tables to be compared against
@param no_errors Don't report error to the client (using my_error() call).
@param any_combination_of_privileges_will_do TRUE if any privileges on any
column combination is enough.
@param number Only the first 'number' tables in the linked list are
relevant.
The suppled table list contains cached privileges. This functions calls the
help functions check_access and check_grant to verify the first three steps
in the privileges check queue:
1. Global privileges
2. OR (db privileges AND host privileges)
3. OR table privileges
4. OR column privileges (not checked by this function!)
5. OR routine privileges (not checked by this function!)
@see check_access
@see check_grant
@note This functions assumes that table list used and
thd->lex->query_tables_own_last value correspond to each other
(the latter should be either 0 or point to next_global member
of one of elements of this table list).
@return
@retval FALSE OK
@retval TRUE Access denied; But column or routine privileges might need to
be checked also.
*/