Message-ID: <4E36CB68.3000606@ank-sia.com>
Date: Mon, 01 Aug 2011 18:51:04 +0300
From: Alexey Luchko <luch AT ank-sia DOT com>
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To: cygwin AT cygwin DOT com
Subject: sshd conflicts with mintty allocating /dev/tty[0-9]
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Hi, everyone!


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 AT 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 AT openssh DOT 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


--
Regards,
Alexey.


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