openssh bugs - Feb 2016 - [Bug 2542] New: Conflicting usernames by -l, -o user, user@ - it's not clear which one is used

https://bugzilla.mindrot.org/show_bug.cgi?id=2542

            Bug ID: 2542
           Summary: Conflicting usernames by -l, -o user, user@ - it's not
                    clear which one is used
           Product: Portable OpenSSH
           Version: 6.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: gbajson at gmail.com

Hi,
I couldn't find any description of the rule for choosing a right
username when many usernames are provided from the command line/config
file:

It seems that usernames provided with -l and ...@ override the ones
from config and "-o user", and the last one is chosen.
I am not sure if this is a documentation issue or a bug.


Examples:
---------

1. "-o" overrides .ssh/config
-----------------------------
gbajson at server1:~$ cat .ssh/config  
Host localhost                      
    user=user_config

gbajson at server1:~$ ssh -o user=user-o localhost   
user-o at localhost's password:                      


2. "-l" and "@" override "-o user"
----------------------------------
gbajson at server1:~$ ssh -l user_minus_l localhost  
user_minus_l at localhost's password:                

gbajson at server1:~$ ssh user_at at localhost 
user_at at localhost's password:            


3. The last username is chosen when, both "-l" and "@" are
provided
-------------------------------------------------------------------
gbajson at server1:~$ ssh user_at at localhost -l user_minus_l    
user_minus_l at localhost's password:                          

gbajson at server1:~$ ssh -l user_minus_l user_at at localhost
user_at at localhost's password:                           


Kind regards,
Grzegorz

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Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at zip.com.au

--- Comment #1 from Darren Tucker <dtucker at zip.com.au> ---
ssh_config(5) has this at the top:

 ssh(1) obtains configuration data from the following sources in the
fol-
 lowing order:

     1.   command-line options
     2.   user's configuration file (~/.ssh/config)
     3.   system-wide configuration file (/usr/local/etc/ssh_config)

does that help?

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Jakub Jelen <jjelen at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jjelen at redhat.com

--- Comment #2 from Jakub Jelen <jjelen at redhat.com> ---
This bug is already filled as bug #2385, but I consider both of them
resolved by the commit mentioned in the other one:

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshconnect.c.diff?r1=1.260&r2=1.261

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--- Comment #3 from Grzegorz Bajson <gbajson at gmail.com> ---
Darren, this helps but doesn't explain cases (2) and (3).

Jakub, in fact this one is a duplicate.

Thank you both.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |djm at mindrot.org
         Resolution|---                         |DUPLICATE

--- Comment #4 from Damien Miller <djm at mindrot.org> ---


*** This bug has been marked as a duplicate of bug 2835 ***

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #5 from Damien Miller <djm at mindrot.org> ---
closing resolved bugs as of 8.6p1 release

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