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• How to get Passive FTP Working Through an Iptables Firewall?

  - by user1133248

  I have an iptables firewall running on a Fedora Linux server that is basically being used as a firewall router and OpenVPN server. That's it. We have been using the same iptables firewall code for YEARS. I did make some changes on 21 December to re-route a mySQL port, but given what has happened I've completely backed those changes out. Sometime after those changes were made and backed out passive FTP, served from a vsftpd process, stopped working. We use a passive ftp client to FLING (that's the name of the ftp client running under Windows! :-) ) images from our remote telescopes to our server. I believe it is something in the firewall code because I can drop the firewall and the FTP file transfer (and connecting to the ftp site with Internet Explorer to see the file list) works. When I raise the iptables firewall, it stops working. Again, this is code that we'd been using for years. However, I felt that maybe there was something I missed, so we had a .bak file from 2009 that I used. Same behavior, passive ftp does not work. So, I went and rebuilt the firewall code line by line to see what line was causing the problem. Everything worked until I put the line -A FORWARD -j DROP in very near the end. Of course, if I am correct, this is the line that basically "turns on" the firewall, saying drop everything except for the exceptions I've made above. However, this line has been in the iptables code probably since 2003. So, I'm at the end of my rope, and I still can't figure out why this has stopped working. I guess I need an expert on iptables configuration. Here is the iptables code (from iptables-save) with comments. # Generated by iptables-save v1.3.8 on Thu Jan 5 18:36:25 2012 *nat # One of the things that I remain ignorant about is what these following three lines # do in both the nat tables (which we're not using on this machine) and the following # filter table. I don't know what the numbers are, but I'm ASSUMING they're port # ranges. # :PREROUTING ACCEPT [7435:551429] :POSTROUTING ACCEPT [6097:354458] :OUTPUT ACCEPT [5:451] COMMIT # Completed on Thu Jan 5 18:36:25 2012 # Generated by iptables-save v1.3.8 on Thu Jan 5 18:36:25 2012 *filter :INPUT ACCEPT [10423:1046501] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [15184:16948770] # The following line is for my OpenVPN configuration. -A INPUT -i tun+ -j ACCEPT # In researching this on the Internet I found some iptables code that was supposed to # open the needed ports up. I never needed this before this week, but since passive FTP # was no longer working, I decided to put the code in. The next three lines are part of # that code. -A INPUT -p tcp -m tcp --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --sport 1024:65535 --dport 20 -m state --state ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --sport 1024:65535 --dport 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT # Another line for the OpenVPN configuration. I don't know why the iptables-save mixed # the lines up. -A FORWARD -i tun+ -j ACCEPT # Various forwards for all our services -A FORWARD -s 65.118.148.197 -p tcp -m tcp --dport 3307 -j ACCEPT -A FORWARD -d 65.118.148.197 -p tcp -m tcp --dport 3307 -j ACCEPT -A FORWARD -s 65.118.148.197 -p tcp -m tcp --dport 3306 -j ACCEPT -A FORWARD -d 65.118.148.197 -p tcp -m tcp --dport 3306 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 21 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 21 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 20 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 20 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 7191 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 7191 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 46000:46999 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 46000:46999 -j ACCEPT -A FORWARD -s 65.118.148.0/255.255.255.0 -j ACCEPT -A FORWARD -d 65.118.148.196 -p udp -m udp --dport 53 -j ACCEPT -A FORWARD -s 65.118.148.196 -p udp -m udp --dport 53 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 53 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 53 -j ACCEPT -A FORWARD -d 65.118.148.196 -p udp -m udp --dport 25 -j ACCEPT -A FORWARD -s 65.118.148.196 -p udp -m udp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 42 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 42 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -d 65.118.148.204 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -s 65.118.148.204 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 6667 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 6667 -j ACCEPT -A FORWARD -s 65.96.214.242 -p tcp -m tcp --dport 22 -j ACCEPT -A FORWARD -s 192.68.148.66 -p tcp -m tcp --dport 22 -j ACCEPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT # "The line" that causes passive ftp to stop working. Insofar as I can tell, everything # else seems to work - ssh, telnet, mysql, httpd. -A FORWARD -j DROP -A FORWARD -p icmp -j ACCEPT # The following code is again part of my attempt to put in code that would cause passive # ftp to work. I don't know why iptables-save scattered it about like this. -A OUTPUT -p tcp -m tcp --sport 21 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 20 --dport 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 1024:65535 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Jan 5 18:36:25 2012 So, with all that prelude, my basic question is: How can I get passive ftp to work behind an iptables firewall? As you can see, I've tried to get it working (again) and tried to do some research on the issue, but have come up...short. Any answers would be appreciated by both me and various variable star astronomers around the world! THANKS! -Richard "Doc" Kinne, American Assoc. of Variable Star Observers, [email protected]

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• Looking for a workaround for IE 6/7 "Unspecified Error" bug when accessing offsetParent; using ASP.N

  - by CodeChef

  I'm using jQuery UI's draggable and droppable libraries in a simple ASP.NET proof of concept application. This page uses the ASP.NET AJAX UpdatePanel to do partial page updates. The page allows a user to drop an item into a trashcan div, which will invoke a postback that deletes a record from the database, then rebinds the list (and other controls) that the item was drug from. All of these elements (the draggable items and the trashcan div) are inside an ASP.NET UpdatePanel. Here is the dragging and dropping initialization script: function initDragging() { $(".person").draggable({helper:'clone'}); $("#trashcan").droppable({ accept: '.person', tolerance: 'pointer', hoverClass: 'trashcan-hover', activeClass: 'trashcan-active', drop: onTrashCanned }); } $(document).ready(function(){ initDragging(); var prm = Sys.WebForms.PageRequestManager.getInstance(); prm.add_endRequest(function() { initDragging(); }); }); function onTrashCanned(e,ui) { var id = $('input[id$=hidID]', ui.draggable).val(); if (id != undefined) { $('#hidTrashcanID').val(id); __doPostBack('btnTrashcan',''); } } When the page posts back, partially updating the UpdatePanel's content, I rebind the draggables and droppables. When I then grab a draggable with my cursor, I get an "htmlfile: Unspecified error." exception. I can resolve this problem in the jQuery library by replacing elem.offsetParent with calls to this function that I wrote: function IESafeOffsetParent(elem) { try { return elem.offsetParent; } catch(e) { return document.body; } } I also have to avoid calls to elem.getBoundingClientRect() as it throws the same error. For those interested, I only had to make these changes in the jQuery.fn.offset function in the Dimensions Plugin. My questions are: Although this works, are there better ways (cleaner; better performance; without having to modify the jQuery library) to solve this problem? If not, what's the best way to manage keeping my changes in sync when I update the jQuery libraries in the future? For, example can I extend the library somewhere other than just inline in the files that I download from the jQuery website. Update: @some It's not publicly accessible, but I will see if SO will let me post the relevant code into this answer. Just create an ASP.NET Web Application (name it DragAndDrop) and create these files. Don't forget to set Complex.aspx as your start page. You'll also need to download the jQuery UI drag and drop plug in as well as jQuery core Complex.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Complex.aspx.cs" Inherits="DragAndDrop.Complex" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> <script src="jquery-1.2.6.min.js" type="text/javascript"></script> <script src="jquery-ui-personalized-1.5.3.min.js" type="text/javascript"></script> <script type="text/javascript"> function initDragging() { $(".person").draggable({helper:'clone'}); $("#trashcan").droppable({ accept: '.person', tolerance: 'pointer', hoverClass: 'trashcan-hover', activeClass: 'trashcan-active', drop: onTrashCanned }); } $(document).ready(function(){ initDragging(); var prm = Sys.WebForms.PageRequestManager.getInstance(); prm.add_endRequest(function() { initDragging(); }); }); function onTrashCanned(e,ui) { var id = $('input[id$=hidID]', ui.draggable).val(); if (id != undefined) { $('#hidTrashcanID').val(id); __doPostBack('btnTrashcan',''); } } </script> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div> <asp:UpdatePanel ID="updContent" runat="server" UpdateMode="Always"> <ContentTemplate> <asp:LinkButton ID="btnTrashcan" Text="trashcan" runat="server" CommandName="trashcan" onclick="btnTrashcan_Click" style="display:none;"></asp:LinkButton> <input type="hidden" id="hidTrashcanID" runat="server" /> <asp:Button ID="Button1" runat="server" Text="Save" onclick="Button1_Click" /> <table> <tr> <td style="width: 300px;"> <asp:DataList ID="lstAllPeople" runat="server" DataSourceID="odsAllPeople" DataKeyField="ID"> <ItemTemplate> <div class="person"> <asp:HiddenField ID="hidID" runat="server" Value='<%# Eval("ID") %>' /> Name: <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' /> <br /> <br /> </div> </ItemTemplate> </asp:DataList> <asp:ObjectDataSource ID="odsAllPeople" runat="server" SelectMethod="SelectAllPeople" TypeName="DragAndDrop.Complex+DataAccess" onselecting="odsAllPeople_Selecting"> <SelectParameters> <asp:Parameter Name="filter" Type="Object" /> </SelectParameters> </asp:ObjectDataSource> </td> <td style="width: 300px;vertical-align:top;"> <div id="trashcan"> drop here to delete </div> <asp:DataList ID="lstPeopleToDelete" runat="server" DataSourceID="odsPeopleToDelete"> <ItemTemplate> ID: <asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' /> <br /> Name: <asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>' /> <br /> <br /> </ItemTemplate> </asp:DataList> <asp:ObjectDataSource ID="odsPeopleToDelete" runat="server" onselecting="odsPeopleToDelete_Selecting" SelectMethod="GetDeleteList" TypeName="DragAndDrop.Complex+DataAccess"> <SelectParameters> <asp:Parameter Name="list" Type="Object" /> </SelectParameters> </asp:ObjectDataSource> </td> </tr> </table> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html> Complex.aspx.cs namespace DragAndDrop { public partial class Complex : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected List<int> DeleteList { get { if (ViewState["dl"] == null) { List<int> dl = new List<int>(); ViewState["dl"] = dl; return dl; } else { return (List<int>)ViewState["dl"]; } } } public class DataAccess { public IEnumerable<Person> SelectAllPeople(IEnumerable<int> filter) { return Database.SelectAll().Where(p => !filter.Contains(p.ID)); } public IEnumerable<Person> GetDeleteList(IEnumerable<int> list) { return Database.SelectAll().Where(p => list.Contains(p.ID)); } } protected void odsAllPeople_Selecting(object sender, ObjectDataSourceSelectingEventArgs e) { e.InputParameters["filter"] = this.DeleteList; } protected void odsPeopleToDelete_Selecting(object sender, ObjectDataSourceSelectingEventArgs e) { e.InputParameters["list"] = this.DeleteList; } protected void Button1_Click(object sender, EventArgs e) { foreach (int id in DeleteList) { Database.DeletePerson(id); } DeleteList.Clear(); lstAllPeople.DataBind(); lstPeopleToDelete.DataBind(); } protected void btnTrashcan_Click(object sender, EventArgs e) { int id = int.Parse(hidTrashcanID.Value); DeleteList.Add(id); lstAllPeople.DataBind(); lstPeopleToDelete.DataBind(); } } } Database.cs namespace DragAndDrop { public static class Database { private static Dictionary<int, Person> _people = new Dictionary<int,Person>(); static Database() { Person[] people = new Person[] { new Person("Chad") , new Person("Carrie") , new Person("Richard") , new Person("Ron") }; foreach (Person p in people) { _people.Add(p.ID, p); } } public static IEnumerable<Person> SelectAll() { return _people.Values; } public static void DeletePerson(int id) { if (_people.ContainsKey(id)) { _people.Remove(id); } } public static Person CreatePerson(string name) { Person p = new Person(name); _people.Add(p.ID, p); return p; } } public class Person { private static int _curID = 1; public int ID { get; set; } public string Name { get; set; } public Person() { ID = _curID++; } public Person(string name) : this() { Name = name; } } }

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