WL#1437 :don't create new users with GRANT

mysql-test/r/grant2.result

@@ -12,6 +12,14 @@ mysqltest_1@localhost
 grant all privileges on `my\_1`.* to mysqltest_2@localhost with grant option;
 grant all privileges on `my_%`.* to mysqltest_3@localhost with grant option;
 ERROR 42000: Access denied for user 'mysqltest_1'@'localhost' to database 'my_%'
+set @@sql_mode='NO_AUTO_CREATE_USER';
+select @@sql_mode;
+@@sql_mode
+NO_AUTO_CREATE_USER
+grant select on `my\_1`.* to mysqltest_4@localhost with grant option;
+ERROR 42000: 'mysqltest_1'@'localhost' is not allowed to create new users
+grant select on `my\_1`.* to mysqltest_4@localhost identified by 'mypass'
+with grant option;
 show grants for mysqltest_1@localhost;
 Grants for mysqltest_1@localhost
 GRANT USAGE ON *.* TO 'mysqltest_1'@'localhost'

mysql-test/r/sql_mode.result

@@ -74,7 +74,7 @@ t1	CREATE TABLE `t1` (
 set sql_mode="postgresql,oracle,mssql,db2,maxdb";
 select @@sql_mode;
 @@sql_mode
-PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,POSTGRESQL,ORACLE,MSSQL,DB2,MAXDB,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS
+PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,POSTGRESQL,ORACLE,MSSQL,DB2,MAXDB,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS,NO_AUTO_CREATE_USER
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE "t1" (

mysql-test/r/strict.result

 set @@sql_mode='ansi,traditional';
 select @@sql_mode;
 @@sql_mode
-REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ONLY_FULL_GROUP_BY,ANSI,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL
+REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ONLY_FULL_GROUP_BY,ANSI,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER
 DROP TABLE IF EXISTS t1;
 CREATE TABLE t1 (col1 date);
 INSERT INTO t1 VALUES('2004-01-01'),('0000-10-31'),('2004-02-29');

mysql-test/t/grant2.test

@@ -21,6 +21,15 @@ select current_user;
 grant all privileges on `my\_1`.* to mysqltest_2@localhost with grant option;
 --error 1044
 grant all privileges on `my_%`.* to mysqltest_3@localhost with grant option;
+#
+# NO_AUTO_CREATE_USER mode
+#
+set @@sql_mode='NO_AUTO_CREATE_USER';
+select @@sql_mode;
+--error 1211
+grant select on `my\_1`.* to mysqltest_4@localhost with grant option;
+grant select on `my\_1`.* to mysqltest_4@localhost identified by 'mypass'
+with grant option;
 disconnect user1;
 connection default;
 show grants for mysqltest_1@localhost;

sql/mysql_priv.h

@@ -280,6 +280,7 @@ extern CHARSET_INFO *national_charset_info, *table_alias_charset;
 #define MODE_INVALID_DATES		(MODE_NO_ZERO_DATE*2)
 #define MODE_ERROR_FOR_DIVISION_BY_ZERO (MODE_INVALID_DATES*2)
 #define MODE_TRADITIONAL		(MODE_ERROR_FOR_DIVISION_BY_ZERO*2)
+#define MODE_NO_AUTO_CREATE_USER	(MODE_TRADITIONAL*2)
 
 #define RAID_BLOCK_SIZE 1024
 

sql/mysqld.cc

@@ -221,7 +221,7 @@ const char *sql_mode_names[] =
   "NO_TABLE_OPTIONS", "NO_FIELD_OPTIONS", "MYSQL323", "MYSQL40", "ANSI",
   "NO_AUTO_VALUE_ON_ZERO", "NO_BACKSLASH_ESCAPES", "STRICT_TRANS_TABLES", "STRICT_ALL_TABLES",
   "NO_ZERO_IN_DATE", "NO_ZERO_DATE", "ALLOW_INVALID_DATES", "ERROR_FOR_DIVISION_BY_ZERO",
-  "TRADITIONAL",
+  "TRADITIONAL", "NO_AUTO_CREATE_USER",
   NullS
 };
 TYPELIB sql_mode_typelib= { array_elements(sql_mode_names)-1,"",

sql/set_var.cc

@@ -3077,7 +3077,7 @@ ulong fix_sql_mode(ulong sql_mode)
     sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
 		MODE_IGNORE_SPACE |
 		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
-		MODE_NO_FIELD_OPTIONS);
+		MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
   if (sql_mode & MODE_MSSQL)
     sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
 		MODE_IGNORE_SPACE |
@@ -3097,7 +3097,7 @@ ulong fix_sql_mode(ulong sql_mode)
     sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
 		MODE_IGNORE_SPACE |
 		MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
-		MODE_NO_FIELD_OPTIONS);
+		MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
   if (sql_mode & MODE_MYSQL40)
     sql_mode|= MODE_NO_FIELD_OPTIONS;
   if (sql_mode & MODE_MYSQL323)
@@ -3105,7 +3105,7 @@ ulong fix_sql_mode(ulong sql_mode)
   if (sql_mode & MODE_TRADITIONAL)
     sql_mode|= (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES |
                 MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
-                MODE_ERROR_FOR_DIVISION_BY_ZERO);
+                MODE_ERROR_FOR_DIVISION_BY_ZERO | MODE_NO_AUTO_CREATE_USER);
   return sql_mode;
 }
 

sql/sql_acl.cc

@@ -1550,13 +1550,28 @@ static int replace_user_table(THD *thd, TABLE *table, const LEX_USER &combo,
 			      (byte*) table->field[0]->ptr,0,
 			      HA_READ_KEY_EXACT))
   {
-    if (!create_user)
+    /* what == 'N' means revoke */
+    if (what == 'N')
     {
-      if (what == 'N')
-	my_error(ER_NONEXISTING_GRANT, MYF(0), combo.user.str, combo.host.str);
-      else
-	my_error(ER_NO_PERMISSION_TO_CREATE_USER, MYF(0),
-                 thd->user, thd->host_or_ip);
+      my_error(ER_NONEXISTING_GRANT, MYF(0), combo.user.str, combo.host.str);
+      goto end;
+    }
+    /*
+      There are four options which affect the process of creation of 
+      a new user(mysqld option --safe-create-user, 'insert' privilege
+      on 'mysql.user' table, using 'GRANT' with 'IDENTIFIED BY' and
+      SQL_MODE flag NO_AUTO_CREATE_USER). Below is the simplified rule
+      how it should work.
+      if (safe-user-create && ! INSERT_priv) => reject
+      else if (identified_by) => create
+      else if (no_auto_create_user) => reject
+      else create
+    */
+    else if (((thd->variables.sql_mode & MODE_NO_AUTO_CREATE_USER) &&
+              !password_len) || !create_user)
+    {
+      my_error(ER_NO_PERMISSION_TO_CREATE_USER, MYF(0),
+               thd->user, thd->host_or_ip);
       goto end;
     }
     old_row_exists = 0;
@@ -1570,6 +1585,17 @@ static int replace_user_table(THD *thd, TABLE *table, const LEX_USER &combo,
   }
   else
   {
+    /*
+      Check that the user isn't trying to change a password for another
+      user if he doesn't have UPDATE privilege to the MySQL database
+    */
+    DBUG_ASSERT(combo.host.str);
+    if (thd->user && combo.password.str &&
+        (strcmp(thd->user,combo.user.str) ||
+         my_strcasecmp(&my_charset_latin1,
+                       combo.host.str, thd->host_or_ip)) &&
+        check_access(thd, UPDATE_ACL, "mysql",0,1,0))
+      goto end;
     old_row_exists = 1;
     store_record(table,record[1]);			// Save copy for update
     if (combo.password.str)			// If password given

sql/sql_parse.cc

@@ -3377,29 +3377,6 @@ purposes internal to the MySQL server", MYF(0));
 		     first_table ? 0 : 1, 0))
       goto error;
 
-    /*
-      Check that the user isn't trying to change a password for another
-      user if he doesn't have UPDATE privilege to the MySQL database
-    */
-
-    if (thd->user)				// If not replication
-    {
-      LEX_USER *user;
-      List_iterator <LEX_USER> user_list(lex->users_list);
-      while ((user=user_list++))
-      {
-	if (user->password.str &&
-	    (strcmp(thd->user,user->user.str) ||
-	     user->host.str &&
-	     my_strcasecmp(&my_charset_latin1,
-                           user->host.str, thd->host_or_ip)))
-	{
-	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
-	    goto error;
-	  break;                                // We are allowed to do changes
-	}
-      }
-    }
     if (specialflag & SPECIAL_NO_RESOLVE)
     {
       LEX_USER *user;