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cleanup: RAII helper for swapping of thd->security_ctx

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This commit is contained in:
Sergei Golubchik 2019-09-10 17:24:34 +02:00
parent d752a97ebb
commit 42ada91542
2 changed files with 22 additions and 25 deletions
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16
sql/sql_class.h
View File

@ -5967,6 +5967,22 @@ class Sql_mode_save
sql_mode_t old_mode; // SQL mode saved at construction time.
};
class Switch_to_definer_security_ctx
{
public:
Switch_to_definer_security_ctx(THD *thd, TABLE_LIST *table) :
m_thd(thd), m_sctx(thd->security_ctx)
{
if (table->security_ctx)
thd->security_ctx= table->security_ctx;
}
~Switch_to_definer_security_ctx() { m_thd->security_ctx = m_sctx; }
private:
THD *m_thd;
Security_context *m_sctx;
};
#endif /* MYSQL_SERVER */
#endif /* SQL_CLASS_INCLUDED */

31
sql/sql_parse.cc
View File

@ -6617,11 +6617,7 @@ check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
bool check_single_table_access(THD *thd, ulong privilege,
TABLE_LIST *all_tables, bool no_errors)
{
Security_context * backup_ctx= thd->security_ctx;
/* we need to switch to the saved context (if any) */
if (all_tables->security_ctx)
thd->security_ctx= all_tables->security_ctx;
Switch_to_definer_security_ctx backup_sctx(thd, all_tables);
const char *db_name;
if ((all_tables->view || all_tables->field_translation) &&
@ -6634,20 +6630,15 @@ bool check_single_table_access(THD *thd, ulong privilege,
&all_tables->grant.privilege,
&all_tables->grant.m_internal,
0, no_errors))
goto deny;
return 1;
/* 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;
return 1;
thd->security_ctx= backup_ctx;
return 0;
deny:
thd->security_ctx= backup_ctx;
return 1;
}
/**
@ -6822,7 +6813,6 @@ check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
{
TABLE_LIST *org_tables= tables;
TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
uint i= 0;
/*
The check that first_not_own_table is not reached is for the case when
@ -6834,12 +6824,9 @@ check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
{
TABLE_LIST *const table_ref= tables->correspondent_table ?
tables->correspondent_table : tables;
Switch_to_definer_security_ctx backup_ctx(thd, table_ref);
ulong want_access= requirements;
if (table_ref->security_ctx)
sctx= table_ref->security_ctx;
else
sctx= backup_ctx;
/*
Register access for view underlying table.
@ -6850,7 +6837,7 @@ check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
if (table_ref->schema_table_reformed)
{
if (check_show_access(thd, table_ref))
goto deny;
return 1;
continue;
}
@ -6860,21 +6847,15 @@ check_table_access(THD *thd, ulong requirements,TABLE_LIST *tables,
if (table_ref->is_anonymous_derived_table())
continue;
thd->security_ctx= sctx;
if (check_access(thd, want_access, table_ref->get_db_name(),
&table_ref->grant.privilege,
&table_ref->grant.m_internal,
0, no_errors))
goto deny;
return 1;
}
thd->security_ctx= backup_ctx;
return check_grant(thd,requirements,org_tables,
any_combination_of_privileges_will_do,
number, no_errors);
deny:
thd->security_ctx= backup_ctx;
return TRUE;
}