sshd conflicts with mintty allocating /dev/tty[0-9]

[Larry Hall (Cygwin)]

On 8/1/2011 12:41 PM, Alexey Luchko wrote:
> On 01.08.2011 18:51, Alexey Luchko wrote:
>> I've run mkpasswd and mkgroups, installed sshd, run sshd-host-config,
>> turned on privilege separation, installed it as a service.
>>
>> 'CYGWIN sshd' service starts normally but it closes connection right after
>> successful login:
>> """
>> $ ssh localhost
>> user@localhost's password:
>> Connection to localhost closed by remote host.
>> Connection to localhost closed.
>> """
>>
>> Logged in sshd's account and started '/usr/sbin/sshd -d' and tries to login
>> via ssh localhost. Tail of sshd output follows:
>> """
>> debug1: userauth-request for user user service ssh-connection method password
>> debug1: attempt 2 failures 1
>> Accepted password for user from ::1 port 63719 ssh2
>> debug1: monitor_child_preauth: user has been authenticated by privileged
>> process
>> debug1: Entering interactive session for SSH2.
>> debug1: server_init_dispatch_20
>> debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max
>> 16384
>> debug1: input_session_request
>> debug1: channel 0: new [server-session]
>> debug1: session_new: session 0
>> debug1: session_open: channel 0
>> debug1: session_open: session 0: link with channel 0
>> debug1: server_input_channel_open: confirm session
>> debug1: server_input_global_request: rtype no-more-sessions@openssh.com
>> want_reply 0
>> debug1: server_input_channel_req: channel 0 request pty-req reply 1
>> debug1: session_by_channel: session 0 channel 0
>> debug1: session_input_channel_req: session 0 req pty-req
>> debug1: Allocating pty.
>> debug1: session_pty_req: session 0 alloc /dev/tty2
>> chown(/dev/tty2, 11135, 10513) failed: Bad file descriptor
>> debug1: do_cleanup
>> debug1: session_pty_cleanup: session 0 release /dev/tty2
>> """
>>
>> It conflicts with mintty because every mintty allocates terminal for
>> himself like this running in mintty:
>> """
>> $ ls -l `tty`
>> crw--w---- 1 user Domain Users 136, 0 Aug 1 18:46 /dev/tty0
>> """
>>
>> Version: CYGWIN_NT-6.1-WOW64 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin
>
>
> Cygwin Configuration Diagnostics atteched.

Maybe crank up the debugging flags to maximum?  I assume sshd is still
stopped from your last run of sshd -d.  If that doesn't sound right to
you, you may want to investigate why it's not running now.

-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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