Bug #41354: Access control is bypassed when all columns

of a view are selected by * wildcard

Backported a part of the fix for 36086 to 5.0

mysql-test/r/view_grant.result:
  Bug #41354: test case
mysql-test/t/view_grant.test:
  Bug #41354: test case
sql/sql_acl.cc:
  Bug #41354: return table error when no access and *
sql/sql_base.cc:
  Bug #41354: backported the check in bug 36086 to 5.0

mysql-test/r/view_grant.result

@@ -919,4 +919,30 @@ c4
 DROP DATABASE mysqltest1;
 DROP DATABASE mysqltest2;
 DROP USER mysqltest_u1@localhost;
+CREATE DATABASE db1;
+USE db1;
+CREATE TABLE t1(f1 INT, f2 INT);
+CREATE VIEW v1 AS SELECT f1, f2 FROM t1;
+GRANT SELECT (f1) ON t1 TO foo;
+GRANT SELECT (f1) ON v1 TO foo;
+USE db1;
+SELECT f1 FROM t1;
+f1
+SELECT f2 FROM t1;
+ERROR 42000: SELECT command denied to user 'foo'@'localhost' for column 'f2' in table 't1'
+SELECT * FROM t1;
+ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 't1'
+SELECT f1 FROM v1;
+f1
+SELECT f2 FROM v1;
+ERROR 42000: SELECT command denied to user 'foo'@'localhost' for column 'f2' in table 'v1'
+SELECT * FROM v1;
+ERROR 42000: SELECT command denied to user 'foo'@'localhost' for table 'v1'
+USE test;
+REVOKE SELECT (f1) ON db1.t1 FROM foo;
+REVOKE SELECT (f1) ON db1.v1 FROM foo;
+DROP USER foo;
+DROP VIEW db1.v1;
+DROP TABLE db1.t1;
+DROP DATABASE db1;
 End of 5.0 tests.

mysql-test/t/view_grant.test

@@ -1185,4 +1185,44 @@ DROP DATABASE mysqltest1;
 DROP DATABASE mysqltest2;
 DROP USER mysqltest_u1@localhost;
 
+
+#
+# Bug #41354: Access control is bypassed when all columns of a view are 
+# selected by * wildcard
+
+CREATE DATABASE db1;
+USE db1;
+CREATE TABLE t1(f1 INT, f2 INT);
+CREATE VIEW v1 AS SELECT f1, f2 FROM t1;
+
+GRANT SELECT (f1) ON t1 TO foo;
+GRANT SELECT (f1) ON v1 TO foo;
+
+connect (addconfoo, localhost, foo,,);
+connection addconfoo;
+USE db1;
+
+
+SELECT f1 FROM t1;
+--error ER_COLUMNACCESS_DENIED_ERROR
+SELECT f2 FROM t1;
+--error ER_TABLEACCESS_DENIED_ERROR
+SELECT * FROM t1;
+
+SELECT f1 FROM v1;
+--error ER_COLUMNACCESS_DENIED_ERROR
+SELECT f2 FROM v1;
+--error ER_TABLEACCESS_DENIED_ERROR
+SELECT * FROM v1;
+
+connection default;
+USE test;
+disconnect addconfoo;
+REVOKE SELECT (f1) ON db1.t1 FROM foo;
+REVOKE SELECT (f1) ON db1.v1 FROM foo;
+DROP USER foo;
+DROP VIEW db1.v1;
+DROP TABLE db1.t1;
+DROP DATABASE db1;
+
 --echo End of 5.0 tests.

sql/sql_acl.cc

@@ -3866,6 +3866,11 @@ bool check_grant_all_columns(THD *thd, ulong want_access_arg,
   Security_context *sctx= thd->security_ctx;
   ulong want_access= want_access_arg;
   const char *table_name= NULL;
+  /*
+    Flag that gets set if privilege checking has to be performed on column
+    level.
+   */
+  bool using_column_privileges= FALSE;
 
   if (grant_option)
   {
@@ -3909,6 +3914,8 @@ bool check_grant_all_columns(THD *thd, ulong want_access_arg,
         GRANT_COLUMN *grant_column= 
           column_hash_search(grant_table, field_name,
                              (uint) strlen(field_name));
+        if (grant_column)
+          using_column_privileges= TRUE;
         if (!grant_column || (~grant_column->rights & want_access))
           goto err;
       }
@@ -3924,12 +3931,21 @@ err:
 
   char command[128];
   get_privilege_desc(command, sizeof(command), want_access);
-  my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
-           command,
-           sctx->priv_user,
-           sctx->host_or_ip,
-           fields->name(),
-           table_name);
+  /*
+    Do not give an error message listing a column name unless the user has
+    privilege to see all columns.
+  */
+  if (using_column_privileges)
+    my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0),
+             command, sctx->priv_user,
+             sctx->host_or_ip, table_name); 
+  else
+    my_error(ER_COLUMNACCESS_DENIED_ERROR, MYF(0),
+             command,
+             sctx->priv_user,
+             sctx->host_or_ip,
+             fields->name(),
+             table_name);
   return 1;
 }
 

sql/sql_base.cc

@@ -5479,7 +5479,7 @@ insert_fields(THD *thd, Name_resolution_context *context, const char *db_name,
 
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
     /* Ensure that we have access rights to all fields to be inserted. */
-    if (!((table && (table->grant.privilege & SELECT_ACL) ||
+    if (!((table && !tables->view && (table->grant.privilege & SELECT_ACL) ||
            tables->view && (tables->grant.privilege & SELECT_ACL))) &&
         !any_privileges)
     {