openssh bugs - Apr 2005 - [Bug 1012] Trouble creating remote port forwarding to ssh.com 2.4.0 server.

http://bugzilla.mindrot.org/show_bug.cgi?id=1012

           Summary: Trouble creating remote port forwarding to ssh.com 2.4.0
                    server.
           Product: Portable OpenSSH
           Version: 4.0p1
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: patch
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: daveroth at acm.org


I'm having a problem with OpenSSH_4.0p1 when trying to do remote port
forwards to a server running SSH Secure Shell 2.4.0. The problem appears
to be that 2.4.0 chokes on bind addresses that aren't numeric addresses,
such as "localhost" and "".

The following commands are failing for me from the 4.0p1 client to the
2.4.0 server:

  ssh -R 50000:localhost:50000 server
  ssh -R localhost:50000:localhost:50000 server
  ssh -R :50000:localhost:50000 server
  ssh -R \*:50000:localhost:50000 server

although these commands work just fine:

  ssh -R 127.0.0.1:50000:localhost:50000 server
  ssh -R 0.0.0.0:50000:localhost:50000 server
  ssh -R 192.168.1.1:50000:localhost:50000 server



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------- Additional Comments From daveroth at acm.org  2005-04-08 02:50 -------
Created an attachment (id=870)
 --> (http://bugzilla.mindrot.org/attachment.cgi?id=870&action=view)
Default  to 0.0.0.0 as bind address for ssh.com 2.4.0 servers.

The attached patch solves the problem for me. It sends "0.0.0.0" as
the
address_to_bind for these cases

  ssh -R 50000:localhost:50000 server
  ssh -R :50000:localhost:50000 server
  ssh -R \*:50000:localhost:50000 server

but still passes through the specified address for cases like

  ssh -R 192.168.1.1:50000:localhost:50000 server



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daveroth at acm.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
    Attachment #870|Default  to 0.0.0.0 as bind |Default to 0.0.0.0 as bind
        description|address for ssh.com 2.4.0   |address for ssh.com 2.4.0
                   |servers.                    |servers.






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------- Additional Comments From djm at mindrot.org  2005-04-18 15:49 -------
(From update of attachment 870)
>diff -Naur openssh-4.0p1-1/channels.c openssh-4.0p1-2/channels.c
>--- openssh-4.0p1-1/channels.c	2005-03-01 02:24:33.000000000 -0800
>+++ openssh-4.0p1-2/channels.c	2005-04-04 17:27:44.230250000 -0700
>@@ -2370,9 +2370,15 @@
> 	if (compat20) {
> 		const char *address_to_bind;
> 		if (listen_host == NULL)
>-			address_to_bind = "localhost";
>+			if (datafellows & SSH_BUG_NUMERICRFWDADDR)
>+				address_to_bind = "0.0.0.0";
I think that should be "127.0.0.1", not "0.0.0.0". Or did
you have a
specific reason for changing this?




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------- Additional Comments From daveroth at acm.org  2005-04-19 02:29 -------
(In reply to comment #2)
> (From update of attachment 870 [edit])
> >diff -Naur openssh-4.0p1-1/channels.c openssh-4.0p1-2/channels.c
> >--- openssh-4.0p1-1/channels.c	2005-03-01 02:24:33.000000000 -0800
> >+++ openssh-4.0p1-2/channels.c	2005-04-04 17:27:44.230250000 -0700
> >@@ -2370,9 +2370,15 @@
> > 	if (compat20) {
> > 		const char *address_to_bind;
> > 		if (listen_host == NULL)
> >-			address_to_bind = "localhost";
> >+			if (datafellows & SSH_BUG_NUMERICRFWDADDR)
> >+				address_to_bind = "0.0.0.0";
> 
> I think that should be "127.0.0.1", not "0.0.0.0". Or
did you have a
> specific reason for changing this?
I did have 127.0.0.1 at first, but I changed it for two reasons. One was that I
think 0.0.0.0 was the old pre-4.0 behavior. The second was that I think
127.0.0.1 will only work for IPv4. I'm no expert here, and I'm not even
sure
ssh.com 2.4 works with IPv6.

I have no problem with changing this to 127.0.0.1 if the above reasons make no
sense. 



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