[scponly] scponly 4.6 (AIX 5.3) scp not working

[Higgins, Bobby G]

I have compiled using the AIX C compiler.  When a user has the scponly shell and attempts 'scp' access the connection fails when trying to write the the channel 0 (socket).  The 'sftp' access works fine.  When a scponly user (tusr4) attempts to login with ssh, the session is closed, as it should.
 
I configured with:
./configure --prefix=/opt/scponly --disable-winscp-compat --enable-rsync-compat --enable-scp-compat --sysconfdir=/etc/opt
 
Created an account:
tusr4:!:12356:1::/home/tusr4:/opt/scponly/bin/scponly

On the server boks_sshd -dddd:
. . .
debug3: mm_auth_password: user authenticated
Accepted password for tusr4 from 140.100.93.16 port 43324 ssh2
debug3: mm_send_keystate: Sending new keys: 20359238 20359198
debug3: mm_newkeys_to_blob: converting 20359238
debug3: mm_newkeys_to_blob: converting 20359198
debug3: mm_send_keystate: New keys have been sent
debug3: mm_send_keystate: Sending compression state
debug3: mm_request_send entering: type 24
debug3: mm_send_keystate: Finished sending state
debug3: mm_request_receive leaving
debug3: mm_request_receive_expect leaving
debug3: mm_newkeys_from_blob: 203886d8(139)
debug2: mac_init: found hmac-sha1
debug3: mm_get_keystate: Waiting for second key
debug3: mm_newkeys_from_blob: 203886d8(139)
debug2: mac_init: found hmac-sha1
debug3: mm_get_keystate: Getting compression state
debug3: mm_get_keystate: Getting Network I/O buffers
debug3: mm_share_sync: Share sync
debug3: mm_share_sync: Share sync end
debug2: User child is on pid 286948
debug3: mm_request_receive entering
debug3: AIX/UsrInfo: set len 25
debug1: permanently_set_uid: 12356/1
debug2: set_newkeys: mode 0
debug2: set_newkeys: mode 1
debug1: Entering interactive session for SSH2.
debug2: fd 7 setting O_NONBLOCK
debug2: fd 8 setting O_NONBLOCK
debug1: server_init_dispatch_20
debug1: server_input_channel_open: ctype session rchan 0 win 131072 max 32768
debug1: input_session_request
debug1: server_input_channel_open: confirm session
debug1: server_input_channel_req: channel 0 request exec reply 0
debug3: boks_ssh_inactive: BoKS not active
debug1: Received SIGCHLD.
debug2: fd 10 setting O_NONBLOCK
debug2: fd 10 is O_NONBLOCK
debug2: fd 12 setting O_NONBLOCK
debug2: notify_done: reading
debug2: channel 0: request exit-status
debug2: channel 0: write failed
debug2: channel 0: close_write
debug2: channel 0: chan_shutdown_write: shutdown() failed for fd10: Socket is not connected
debug2: channel 0: output open -> closed
. . .
 
>From the client scp -vvvv tusr4 at remotehost:dos.txt DOS.TXT:
. . .
debug1: Authentication succeeded (password).
debug2: fd 5 setting O_NONBLOCK
debug2: fd 6 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Entering interactive session.
debug2: callback start
debug2: ssh_session2_setup: id 0
debug1: Sending command: scp -v -f dos.txt
debug2: channel 0: request exec
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 131072
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug2: channel 0: rcvd ext data 968
debug3: channel 0: close_fds r -1 w -1 e -1
debug2: channel 0: written 968 to efd 7
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug2: channel 0: rcvd close
debug2: channel 0: close_read
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i3/0 o3/0 fd -1/-1)
debug3: channel 0: close_fds r -1 w -1 e 7
debug1: fd 0 clearing O_NONBLOCK
debug1: fd 1 clearing O_NONBLOCK
debug1: Transferred: stdin 0, stdout 0, stderr 0 bytes in 0.1 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.0
debug1: Exit status 1
 
Bobby Higgins
 
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