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| From: | "Andy Keane" <Andy DOT Keane AT soton DOT ac DOT uk> |
| To: | "'Andy Keane'" <Andy DOT Keane AT soton DOT ac DOT uk>, <cygwin AT cygwin DOT com> |
| Subject: | RE: uid having logged in with ssh |
| Date: | Wed, 9 Aug 2006 20:59:03 +0100 |
| Message-ID: | <001c01c6bbee$47443220$35c94e98@CASSANDRA5> |
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Hi I am running sshd having set up the sshd service using ssh-host-config with privilege separation and with sshd running as a server owned by the local sshd_server user. All is working fine and I can log in using my keys without the need for passwords or without keys and using passwords. My problem is that if I then try and run some processes after logging in (specifically MPI ones) the system thinks I am the local sshd_server user and not the person I wish to be. If I try and run the sshd process as the user instead and without putting it up as a service and without privilege separation then sshd fails to accept the login as it tries to do a setuid which fails: SSH Secure Shell 3.2.9 (Build 283) Copyright (c) 2000-2003 SSH Communications Security Corp - http://www.ssh.com/ This copy of SSH Secure Shell is a non-commercial version. This version does not include PKI and PKCS #11 functionality. Last login: Wed Aug 9 16:31:36 2006 from 192.168.98.20 debug1: permanently_set_uid: 11155/10512 setreuid 11155: Permission denied debug1: do_cleanup Please note that the sshd looks like this on the cygwin side: PID PPID PGID WINPID TTY UID STIME COMMAND I 4756 1 4756 5764 3 11155 Aug 8 /usr/bin/bash 4392 1 4392 4392 con 11155 16:29:21 /usr/bin/bash 7904 4392 7904 7148 con 11155 16:32:53 /usr/sbin/sshd 3828 1 3828 3828 con 11155 16:32:56 /usr/bin/bash 4632 3828 4632 4168 con 11155 16:33:24 /usr/bin/ps and debug1: sshd version OpenSSH_4.3p2 debug1: private host key: #0 type 0 RSA1 debug1: read PEM private key done: type RSA debug1: private host key: #1 type 1 RSA debug1: read PEM private key done: type DSA debug1: private host key: #2 type 2 DSA debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-d' debug1: Bind to port 22 on 0.0.0.0. Server listening on 0.0.0.0 port 22. Generating 768 bit RSA key. RSA key generation complete. debug1: fd 4 clearing O_NONBLOCK debug1: Server will not fork when running in debugging mode. debug1: rexec start in 4 out 4 newsock 4 pipe -1 sock 7 debug1: inetd sockets after dupping: 3, 3 Connection from 192.168.98.20 port 1590 debug1: Client protocol version 1.99; client software version 3.2.9 SSH Secure Shell for Windows debug1: no match: 3.2.9 SSH Secure Shell for Windows debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-1.99-OpenSSH_4.3 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: client->server aes128-cbc hmac-md5 none debug1: kex: server->client aes128-cbc hmac-md5 none debug1: expecting SSH2_MSG_KEXDH_INIT debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: KEX done debug1: userauth-request for user ajk service ssh-connection method none debug1: attempt 0 failures 0 Failed none for ajk from 192.168.98.20 port 1590 ssh2 debug1: userauth-request for user ajk service ssh-connection method none debug1: attempt 1 failures 1 Failed none for ajk from 192.168.98.20 port 1590 ssh2 debug1: userauth-request for user ajk service ssh-connection method keyboard-interactive debug1: attempt 2 failures 2 debug1: keyboard-interactive devs debug1: auth2_challenge: user=ajk devs= debug1: kbdint_alloc: devices '' Failed keyboard-interactive for ajk from 192.168.98.20 port 1590 ssh2 debug1: userauth-request for user ajk service ssh-connection method password debug1: attempt 3 failures 3 Accepted password for ajk from 192.168.98.20 port 1590 ssh2 debug1: Entering interactive session for SSH2. debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 10000 max 512 debug1: input_session_request debug1: channel 0: new [server-session] debug1: session_new: init 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_channel_req: channel 0 request pty-req reply 0 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/tty4 debug1: server_input_channel_req: channel 0 request shell reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req shell debug1: server_input_channel_req: channel 0 request window-change reply 0 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req window-change debug1: Received SIGCHLD. debug1: session_by_pid: pid 4532 debug1: session_exit_message: session 0 channel 0 pid 4532 debug1: session_exit_message: release channel 0 debug1: session_pty_cleanup: session 0 release /dev/tty4 debug1: session_by_channel: session 0 channel 0 debug1: session_close_by_channel: channel 0 child 0 debug1: session_close: session 0 pid 0 debug1: channel 0: free: server-session, nchannels 1 Connection closed by 192.168.98.20 debug1: do_cleanup Closing connection to 192.168.98.20 which suggests that the setreuid is in fact not needed at all! Any ideas how I can get sshd working such that after log in I am really the user I wish to be would be much appreciated. Andy Keane Prof. Andy Keane, School of Engineering Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK. Tel +44(0)2380 592944, Fax +44(0)2380 594813, Mob +44(0)7802 422728 http://www.soton.ac.uk/~ajk See our new book at http://www.aerospacedesign.org -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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