Question

Command / method to scp ( ssh secure copy ) across two hosts ( Linux Solaris )

Asked by: sunhux

Hi

I have host A on subnet 1 which can reach host B.
Host B has another NIC port which connects to subnet 2
 & Host B can reach Host C.

Host A has no route to Host C & I'm not allowed to add a
route in Host B.

All hosts A, B, C are hardened & I'm not allowed to run remsh or rsh
or ftp,    only scp or sftp

Host A is Redhat Enterprise Linux 4.5 while Host B is a Redhat
Enterprise Linux 5.3  &  Host C is a Solaris 8

Q1:
How can I scp or sftp a file from Host A to Host B ?
scp ... | ... | ...
I'll need a script or command that can be run daily on A
without the need to do it manually (just a cron job in A).
 Need to copy files about once per day from host A to C

Q2:
Can someone describe or point me to a link on simple ways to set up
scp ( ie ssh )  without the need of password, ie using private/public  keys

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Asked On
2009-09-15 at 04:58:38ID24732526
Tags

Command / method to scp ( ssh secure copy ) across two hosts ( Linux Solaris )

Topics

Linux Network Security

,

Unix Network Security

,

Linux Setup

Participating Experts
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Points
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Answers

 

by: medveddPosted on 2009-09-15 at 05:53:08ID: 25334289

 

by: TintinPosted on 2009-09-15 at 14:06:17ID: 25339517

1.  Are you allowed to run any software on host B?
2.  Do you have ssh access to host B or is it restricted to scp/sftp?

 

by: sunhuxPosted on 2009-09-15 at 18:16:28ID: 25341043

Thanks.

Hi TinTin

Yes, I have ssh access to host B & both  A & C could ssh to B as well
Let me know if you have a way around this

 

by: TintinPosted on 2009-09-15 at 20:56:37ID: 25341730

OK, what you do is on host A, issue

ssh user@HostB -L 2222:hostC:22
scp -P 2222 user@localhost:/some/dir

To explain more fully.  This sets up a SSH tunnel between HostA and HostC using HostB as the intermediary.  The -L 2222 specifies what port to listen to locally on HostA to enter the tunnel and the host and port number following tell it where to tunnel to.

So long as you have ssh keys set up, you can automate the whole process with no user interaction.

20120131-EE-VQP-002

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