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MDEV-5876: MySQL bug #11766767 - "59957: VIEW USING MERGE PERMISSIONS IN MULTI-TABLE UPDATE"

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Backported multi_update_check_table_access() from 5.6

The code is slightly different in MariaDB, becasue we instansiate fields in merged tables earlier.

mysql-test/mysql-test-run.pl:
  Fixed comment
mysql-test/r/view_grant.result:
  Merged test case from 5.6
mysql-test/t/view_grant.test:
  Merged test case from 5.6
sql/sql_parse.cc:
  Reset orig_want_privilege as this will be rechecked later.
  If not, we will have a problem in mysql_multi_update_prepare() for the call to mysql_handle_derived()
sql/sql_update.cc:
  Backport multi_update_check_table_access() from 5.6
This commit is contained in:
Michael Widenius 2014-03-24 08:18:01 +02:00 committed by Michael Widenius
parent 7c81a51516
commit 4cc3fd48f6
5 changed files with 401 additions and 12 deletions
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2
mysql-test/mysql-test-run.pl
View File

@ -5229,7 +5229,7 @@ sub report_failure_and_restart ($) {
# In these cases we may want valgrind report from normal termination
$tinfo->{'dont_kill_server'}= 1;
}
# Shotdown properly if not to be killed (for valgrind)
# Shutdown properly if not to be killed (for valgrind)
stop_all_servers($tinfo->{'dont_kill_server'} ? $opt_shutdown_timeout : 0);
$tinfo->{'result'}= 'MTR_RES_FAILED';

149
mysql-test/r/view_grant.result
View File

@ -1575,3 +1575,152 @@ USE test;
DROP DATABASE mysqltest1;
DROP USER 'mysqluser1'@'%';
DROP USER 'mysqluser2'@'%';
#
# Test for bug #11766767 - "59957: VIEW USING MERGE PERMISSIONS
# IN MULTI-TABLE UPDATE".
#
drop database if exists mysqltest1;
drop database if exists mysqltest2;
#
# Prepare playground.
create database mysqltest1;
create database mysqltest2;
create user user_11766767;
grant select on mysqltest1.* to user_11766767;
grant all on mysqltest2.* to user_11766767;
use mysqltest1;
create table t1 (id int primary key, val varchar(20));
insert into t1 values (1, 'test1');
create table t11 (id int primary key);
insert into t11 values (1);
create algorithm=temptable view v1_temp as select * from t1;
create algorithm=merge view v1_merge as select * from t1;
create algorithm=temptable view v11_temp as
select t1.id as id, t1.val as val from t1, t11 where t1.id= t11.id;
create algorithm=merge view v11_merge as
select t1.id as id, t1.val as val from t1, t11 where t1.id= t11.id;
use mysqltest2;
create table t2 (id int primary key, val varchar(20));
insert into t2 values (1, 'test2');
create table t21 (id int primary key);
insert into t21 values (1);
create algorithm=temptable view v2_temp as select * from t2;
create algorithm=merge view v2_merge as select * from t2;
create algorithm=temptable view v21_temp as
select t2.id as id, t2.val as val from t2, t21 where t2.id= t21.id;
create algorithm=merge view v21_merge as
select t2.id as id, t2.val as val from t2, t21 where t2.id= t21.id;
create algorithm=temptable sql security invoker view v3_temp as
select t1.id as id, t1.val as val from mysqltest1.t1 as t1, mysqltest1.t11 as t11
where t1.id = t11.id;
create algorithm=merge sql security invoker view v3_merge as
select t1.id as id, t1.val as val from mysqltest1.t1 as t1, mysqltest1.t11 as t11
where t1.id = t11.id;
create sql security invoker view v31 as
select t2.id as id, t2.val as val from mysqltest2.t2 as t2, mysqltest1.t11 as t11
where t2.id = t11.id;
create sql security invoker view v4 as
select t2.id as id, t2.val as val from mysqltest2.t2 as t2, mysqltest1.v1_merge as v1
where t2.id = v1.id;
create sql security invoker view v41 as
select v1.id as id, v1.val as val from mysqltest2.t2 as t2, mysqltest1.v1_merge as v1
where t2.id = v1.id;
create sql security invoker view v42 as
select v2.id as id, v2.val as val from mysqltest2.t2 as t2, mysqltest2.v2_merge as v2
where t2.id = v2.id;
#
# Connect as user_11766767
#
# A) Check how we handle privilege checking in multi-update for
# directly used views.
#
# A.1) Originally reported problem, view is used in read-only mode.
# This should work with only SELECT privilege for both mergeable
# and temptable algorithms.
update mysqltest2.t2 as t2, mysqltest1.v1_merge as v1 set t2.val= 'test3'
where t2.id= v1.id;
update mysqltest2.t2 as t2, mysqltest1.v1_temp as v1 set t2.val= 'test4'
where t2.id= v1.id;
#
# A.2) If view is updated an UPDATE privilege on it is required.
# Temptable views can't be updated.
update mysqltest2.t2 as t2, mysqltest1.v1_merge as v1 set v1.val= 'test5'
where t2.id= v1.id;
ERROR 42000: UPDATE command denied to user 'user_11766767'@'localhost' for table 'v1_merge'
update mysqltest1.t1 as t1, mysqltest2.v2_merge as v2 set v2.val= 'test6'
where t1.id= v2.id;
#
# Note that the below error is OK even though user lacks UPDATE
# privilege on v1_temp since he/she still has SELECT privilege on
# this view.
update mysqltest2.t2 as t2, mysqltest1.v1_temp as v1 set v1.val= 'test7'
where t2.id= v1.id;
ERROR HY000: The target table v1 of the UPDATE is not updatable
update mysqltest1.t1 as t1, mysqltest2.v2_temp as v2 set v2.val= 'test8'
where t1.id= v2.id;
ERROR HY000: The target table v2 of the UPDATE is not updatable
#
# A.3) This also works for correctly for multi-table views.
# When usage is read-only SELECT is enough.
update mysqltest2.t2 as t2, mysqltest1.v11_merge as v11 set t2.val= 'test9'
where t2.id= v11.id;
update mysqltest2.t2 as t2, mysqltest1.v11_temp as v11 set t2.val= 'test10'
where t2.id= v11.id;
# When one of view's tables is updated, UPDATE is required
# on a view.
update mysqltest2.t2 as t2, mysqltest1.v11_merge as v11 set v11.val= 'test11'
where t2.id= v11.id;
ERROR 42000: UPDATE command denied to user 'user_11766767'@'localhost' for table 'v11_merge'
update mysqltest1.t1 as t1, mysqltest2.v21_merge as v21 set v21.val= 'test12'
where t1.id= v21.id;
# As before, temptable views are not updateable.
update mysqltest2.t2 as t2, mysqltest1.v11_temp as v11 set v11.val= 'test13'
where t2.id= v11.id;
ERROR HY000: The target table v11 of the UPDATE is not updatable
update mysqltest1.t1 as t1, mysqltest2.v21_temp as v21 set v21.val= 'test14'
where t1.id= v21.id;
ERROR HY000: The target table v21 of the UPDATE is not updatable
#
# B) Now check that correct privileges are required on underlying
# tables. To simplify this part of test we will use SECURITY
# INVOKER views in it.
#
# B.1) In case when view is used for read only it is enough to have
# SELECT on its underlying tables.
update mysqltest2.t2 as t2, mysqltest2.v3_merge as v3 set t2.val= 'test15'
where t2.id= v3.id;
update mysqltest2.t2 as t2, mysqltest2.v3_temp as v3 set t2.val= 'test16'
where t2.id= v3.id;
#
# B.2) If view is updated, UPDATE privilege on the table being updated
# is required (since we already checked that temptable views are
# not updateable we don't test them here).
update mysqltest2.t2 as t2, mysqltest2.v3_merge as v3 set v3.val= 'test17'
where t2.id= v3.id;
ERROR HY000: View 'mysqltest2.v3_merge' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
update mysqltest1.t11 as t11, mysqltest2.v31 as v31 set v31.val= 'test18'
where t11.id= v31.id;
#
# C) Finally, check how we handle privilege checking in case when
# view is used through another view. Again we will use SECURITY
# INVOKER views for simplicity.
#
# C.1) As usual, when a view used by another view is going to be used
# in read-only fashion, only SELECT privilege is necessary.
update mysqltest1.t11 as t11, mysqltest2.v4 as v4 set v4.val= 'test19'
where t11.id= v4.id;
#
# C.2) If one of underlying tables of the view is updated then
# UPDATE on a view is necessary.
update mysqltest1.t11 as t11, mysqltest2.v41 as v4 set v4.val= 'test20'
where t11.id= v4.id;
ERROR HY000: View 'mysqltest2.v41' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
update mysqltest1.t11 as t11, mysqltest2.v42 as v4 set v4.val= 'test20'
where t11.id= v4.id;
#
# Clean-up.
#
# Switching to connection 'default'.
drop user user_11766767;
drop database mysqltest1;
drop database mysqltest2;

160
mysql-test/t/view_grant.test
View File

@ -2047,6 +2047,166 @@ DROP DATABASE mysqltest1;
DROP USER 'mysqluser1'@'%';
DROP USER 'mysqluser2'@'%';
--echo #
--echo # Test for bug #11766767 - "59957: VIEW USING MERGE PERMISSIONS
--echo # IN MULTI-TABLE UPDATE".
--echo #
--disable_warnings
drop database if exists mysqltest1;
drop database if exists mysqltest2;
--enable_warnings
--echo #
--echo # Prepare playground.
create database mysqltest1;
create database mysqltest2;
create user user_11766767;
grant select on mysqltest1.* to user_11766767;
grant all on mysqltest2.* to user_11766767;
use mysqltest1;
create table t1 (id int primary key, val varchar(20));
insert into t1 values (1, 'test1');
create table t11 (id int primary key);
insert into t11 values (1);
create algorithm=temptable view v1_temp as select * from t1;
create algorithm=merge view v1_merge as select * from t1;
create algorithm=temptable view v11_temp as
select t1.id as id, t1.val as val from t1, t11 where t1.id= t11.id;
create algorithm=merge view v11_merge as
select t1.id as id, t1.val as val from t1, t11 where t1.id= t11.id;
use mysqltest2;
create table t2 (id int primary key, val varchar(20));
insert into t2 values (1, 'test2');
create table t21 (id int primary key);
insert into t21 values (1);
create algorithm=temptable view v2_temp as select * from t2;
create algorithm=merge view v2_merge as select * from t2;
create algorithm=temptable view v21_temp as
select t2.id as id, t2.val as val from t2, t21 where t2.id= t21.id;
create algorithm=merge view v21_merge as
select t2.id as id, t2.val as val from t2, t21 where t2.id= t21.id;
create algorithm=temptable sql security invoker view v3_temp as
select t1.id as id, t1.val as val from mysqltest1.t1 as t1, mysqltest1.t11 as t11
where t1.id = t11.id;
create algorithm=merge sql security invoker view v3_merge as
select t1.id as id, t1.val as val from mysqltest1.t1 as t1, mysqltest1.t11 as t11
where t1.id = t11.id;
create sql security invoker view v31 as
select t2.id as id, t2.val as val from mysqltest2.t2 as t2, mysqltest1.t11 as t11
where t2.id = t11.id;
create sql security invoker view v4 as
select t2.id as id, t2.val as val from mysqltest2.t2 as t2, mysqltest1.v1_merge as v1
where t2.id = v1.id;
create sql security invoker view v41 as
select v1.id as id, v1.val as val from mysqltest2.t2 as t2, mysqltest1.v1_merge as v1
where t2.id = v1.id;
create sql security invoker view v42 as
select v2.id as id, v2.val as val from mysqltest2.t2 as t2, mysqltest2.v2_merge as v2
where t2.id = v2.id;
--echo #
--echo # Connect as user_11766767
connect (conn_11766767, localhost, user_11766767,,);
--echo #
--echo # A) Check how we handle privilege checking in multi-update for
--echo # directly used views.
--echo #
--echo # A.1) Originally reported problem, view is used in read-only mode.
--echo # This should work with only SELECT privilege for both mergeable
--echo # and temptable algorithms.
update mysqltest2.t2 as t2, mysqltest1.v1_merge as v1 set t2.val= 'test3'
where t2.id= v1.id;
update mysqltest2.t2 as t2, mysqltest1.v1_temp as v1 set t2.val= 'test4'
where t2.id= v1.id;
--echo #
--echo # A.2) If view is updated an UPDATE privilege on it is required.
--echo # Temptable views can't be updated.
--error ER_TABLEACCESS_DENIED_ERROR
update mysqltest2.t2 as t2, mysqltest1.v1_merge as v1 set v1.val= 'test5'
where t2.id= v1.id;
update mysqltest1.t1 as t1, mysqltest2.v2_merge as v2 set v2.val= 'test6'
where t1.id= v2.id;
--echo #
--echo # Note that the below error is OK even though user lacks UPDATE
--echo # privilege on v1_temp since he/she still has SELECT privilege on
--echo # this view.
--error ER_NON_UPDATABLE_TABLE
update mysqltest2.t2 as t2, mysqltest1.v1_temp as v1 set v1.val= 'test7'
where t2.id= v1.id;
--error ER_NON_UPDATABLE_TABLE
update mysqltest1.t1 as t1, mysqltest2.v2_temp as v2 set v2.val= 'test8'
where t1.id= v2.id;
--echo #
--echo # A.3) This also works for correctly for multi-table views.
--echo # When usage is read-only SELECT is enough.
update mysqltest2.t2 as t2, mysqltest1.v11_merge as v11 set t2.val= 'test9'
where t2.id= v11.id;
update mysqltest2.t2 as t2, mysqltest1.v11_temp as v11 set t2.val= 'test10'
where t2.id= v11.id;
--echo # When one of view's tables is updated, UPDATE is required
--echo # on a view.
--error ER_TABLEACCESS_DENIED_ERROR
update mysqltest2.t2 as t2, mysqltest1.v11_merge as v11 set v11.val= 'test11'
where t2.id= v11.id;
update mysqltest1.t1 as t1, mysqltest2.v21_merge as v21 set v21.val= 'test12'
where t1.id= v21.id;
--echo # As before, temptable views are not updateable.
--error ER_NON_UPDATABLE_TABLE
update mysqltest2.t2 as t2, mysqltest1.v11_temp as v11 set v11.val= 'test13'
where t2.id= v11.id;
--error ER_NON_UPDATABLE_TABLE
update mysqltest1.t1 as t1, mysqltest2.v21_temp as v21 set v21.val= 'test14'
where t1.id= v21.id;
--echo #
--echo # B) Now check that correct privileges are required on underlying
--echo # tables. To simplify this part of test we will use SECURITY
--echo # INVOKER views in it.
--echo #
--echo # B.1) In case when view is used for read only it is enough to have
--echo # SELECT on its underlying tables.
update mysqltest2.t2 as t2, mysqltest2.v3_merge as v3 set t2.val= 'test15'
where t2.id= v3.id;
update mysqltest2.t2 as t2, mysqltest2.v3_temp as v3 set t2.val= 'test16'
where t2.id= v3.id;
--echo #
--echo # B.2) If view is updated, UPDATE privilege on the table being updated
--echo # is required (since we already checked that temptable views are
--echo # not updateable we don't test them here).
--error ER_VIEW_INVALID
update mysqltest2.t2 as t2, mysqltest2.v3_merge as v3 set v3.val= 'test17'
where t2.id= v3.id;
update mysqltest1.t11 as t11, mysqltest2.v31 as v31 set v31.val= 'test18'
where t11.id= v31.id;
--echo #
--echo # C) Finally, check how we handle privilege checking in case when
--echo # view is used through another view. Again we will use SECURITY
--echo # INVOKER views for simplicity.
--echo #
--echo # C.1) As usual, when a view used by another view is going to be used
--echo # in read-only fashion, only SELECT privilege is necessary.
update mysqltest1.t11 as t11, mysqltest2.v4 as v4 set v4.val= 'test19'
where t11.id= v4.id;
--echo #
--echo # C.2) If one of underlying tables of the view is updated then
--echo # UPDATE on a view is necessary.
--error ER_VIEW_INVALID
update mysqltest1.t11 as t11, mysqltest2.v41 as v4 set v4.val= 'test20'
where t11.id= v4.id;
update mysqltest1.t11 as t11, mysqltest2.v42 as v4 set v4.val= 'test20'
where t11.id= v4.id;
--echo #
--echo # Clean-up.
--echo #
--echo # Switching to connection 'default'.
disconnect conn_11766767;
connection default;
drop user user_11766767;
drop database mysqltest1;
drop database mysqltest2;
# Wait till we reached the initial number of concurrent sessions
--source include/wait_until_count_sessions.inc

1
sql/sql_parse.cc
View File

@ -7685,6 +7685,7 @@ bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
check_grant(thd, SELECT_ACL, table, FALSE, 1, FALSE)))
DBUG_RETURN(TRUE);
table->grant.orig_want_privilege= 0;
table->table_in_first_from_clause= 1;
}
/*

101
sql/sql_update.cc
View File

@ -1217,6 +1217,87 @@ bool unsafe_key_update(List<TABLE_LIST> leaves, table_map tables_for_update)
return false;
}
/**
Check if there is enough privilege on specific table used by the
main select list of multi-update directly or indirectly (through
a view).
@param[in] thd Thread context.
@param[in] table Table list element for the table.
@param[in] tables_for_update Bitmap with tables being updated.
@param[in/out] updated_arg Set to true if table in question is
updated, also set to true if it is
a view and one of its underlying
tables is updated. Should be
initialized to false by the caller
before a sequence of calls to this
function.
@note To determine which tables/views are updated we have to go from
leaves to root since tables_for_update contains map of leaf
tables being updated and doesn't include non-leaf tables
(fields are already resolved to leaf tables).
@retval false - Success, all necessary privileges on all tables are
present or might be present on column-level.
@retval true - Failure, some necessary privilege on some table is
missing.
*/
static bool multi_update_check_table_access(THD *thd, TABLE_LIST *table,
table_map tables_for_update,
bool *updated_arg)
{
if (table->view)
{
bool updated= false;
/*
If it is a mergeable view then we need to check privileges on its
underlying tables being merged (including views). We also need to
check if any of them is updated in order to find if this view is
updated.
If it is a non-mergeable view then it can't be updated.
*/
DBUG_ASSERT(table->merge_underlying_list ||
(!table->updatable &&
!(table->table->map & tables_for_update)));
for (TABLE_LIST *tbl= table->merge_underlying_list; tbl;
tbl= tbl->next_local)
{
if (multi_update_check_table_access(thd, tbl, tables_for_update,
&updated))
{
tbl->hide_view_error(thd);
return true;
}
}
if (check_table_access(thd, updated ? UPDATE_ACL: SELECT_ACL, table,
FALSE, 1, FALSE))
return true;
*updated_arg|= updated;
/* We only need SELECT privilege for columns in the values list. */
table->grant.want_privilege= SELECT_ACL & ~table->grant.privilege;
}
else
{
/* Must be a base or derived table. */
const bool updated= table->table->map & tables_for_update;
if (check_table_access(thd, updated ? UPDATE_ACL : SELECT_ACL, table,
FALSE, 1, FALSE))
return true;
*updated_arg|= updated;
/* We only need SELECT privilege for columns in the values list. */
if (!table->derived)
{
table->grant.want_privilege= SELECT_ACL & ~table->grant.privilege;
table->table->grant.want_privilege= (SELECT_ACL &
~table->table->grant.privilege);
}
}
return false;
}
/*
make update specific preparation and checks after opening tables
@ -1351,19 +1432,17 @@ int mysql_multi_update_prepare(THD *thd)
tl->table->reginfo.lock_type= tl->lock_type;
}
}
/*
Check access privileges for tables being updated or read.
Note that unlike in the above loop we need to iterate here not only
through all leaf tables but also through all view hierarchy.
*/
for (tl= table_list; tl; tl= tl->next_local)
{
/* Check access privileges for table */
if (!tl->is_derived())
{
uint want_privilege= tl->updating ? UPDATE_ACL : SELECT_ACL;
if (check_access(thd, want_privilege, tl->db,
&tl->grant.privilege,
&tl->grant.m_internal,
0, 0) ||
check_grant(thd, want_privilege, tl, FALSE, 1, FALSE))
DBUG_RETURN(TRUE);
}
bool not_used= false;
if (multi_update_check_table_access(thd, tl, tables_for_update, &not_used))
DBUG_RETURN(TRUE);
}
/* check single table update for view compound from several tables */