[Bug 2243] New: scp ignoring ~/.ssh/config when both source and destination are remote hosts

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2243

            Bug ID: 2243
           Summary: scp ignoring ~/.ssh/config when both source and
                    destination are remote hosts
           Product: Portable OpenSSH
           Version: 6.6p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: adam.wolk at koparo.com

Hi,

I think I stumbled on a bug while trying to copy some database backups
between two servers. Since both of the machines in question have only
key auth available and I don't want to put my key on neither one of
them I decided to copy over the data using scp since it supports having
both the source and destination as remote hosts.

One of the machines (build.koparo.com) is running ssh on a non standard
port and the second one is running on the default port. I decided to
add an entry to ~/.ssh/config for the build.koparo.com machine in order
to avoid any additional flags for the command while copying over the
files.

I tested my config file by doing a regular ssh to the build.koparo.com
machine without using the -p parameter and it worked correctly so I
issued the copy command and it failed with a lost connection.

>From there I did several more tests including only the machine running
on a non standard port and it seems that the config file is ignored if
both ends are remote.

[mulander at koparo ~]$ ssh -V
OpenSSH_6.6.1p1, OpenSSL 1.0.1g 7 Apr 2014

My ~/.ssh/config file stating that build.koparo.com runs ssh on port
5222

[mulander at koparo ~]$ cat ~/.ssh/config
Host build.koparo.com
        Port 5222

[mulander at koparo ~]$


Copy a remote file from ssh running on port 5222 - properly uses the
~/.ssh/config

[mulander at koparo ~]$ scp build.koparo.com:~/case962.patch ./
Enter passphrase for key '/home/mulander/.ssh/id_rsa':
case962.patch                                                          
                                           100% 1177     1.2KB/s  
00:00
[mulander at koparo ~]$

Copy a local file to remote ssh running on port 5222 - properly uses
the ~/.ssh/config

[mulander at koparo ~]$ scp case962.patch build.koparo.com:~/adam.txt
Enter passphrase for key '/home/mulander/.ssh/id_rsa':
case962.patch                                                          
                                           100% 1177     1.2KB/s  
00:00

Copy the same file (adam.txt) on the remote host renaming it to
adam2.txt - ~/.ssh/config seems to be ignored

[mulander at koparo ~]$ scp build.koparo.com:~/adam.txt
build.koparo.com:~/adam2.txt
Enter passphrase for key '/home/mulander/.ssh/id_rsa':
ssh: connect to host build.koparo.com port 22: Connection refused
lost connection
[mulander at koparo ~]$

Trying the -F flag to point at the config file directly:

[mulander at koparo ~]$ scp -F /home/mulander/.ssh/config
build.koparo.com:~/adam.txt build.koparo.com:~/adam2.txt
Enter passphrase for key '/home/mulander/.ssh/id_rsa':
ssh: connect to host build.koparo.com port 22: Connection refused
lost connection
[mulander at koparo ~]$


I can properly ssh to the machine - config file is read correctly
without me having to specify the port with -p.

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