[Bug 731] sshd terminates a session after a successful login

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Tue Oct 7 18:25:28 EST 2003 

http://bugzilla.mindrot.org/show_bug.cgi?id=731

           Summary: sshd terminates a session after a successful login
           Product: Portable OpenSSH
           Version: -current
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sshd
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: Uwe.Veiel at siemens.com


I've recently upgraded our environment to OpenSSH-3.7.1p2 on Solaris, Linux, HP-
UX and Reliant-Unix(5.44). I have had no luck when it comes to getting the 
Reliant-Unix environment to work. With sshd running on an Reliant-Unix server. 
I connect with the same version/OS ssh, watch the connection establish, get 
right up to the point where the shell should spawn and sshd terminates. A login 
is only still over SSH under "root" possible. I have been unable to find any 
information online regarding this behavior and am looking for any assistance 
possible. Interestingly, OpenSSH-3.6.1p2 works properly in this environment. 

-----------------------

# /opt/openssh/sbin/sshd -ddd -p 2022
debug3: Seeding PRNG from /opt/openssh/libexec/ssh-rand-helper
debug2: read_server_config: filename /etc/openssh/sshd_config
debug1: sshd version OpenSSH_3.7.1p2
debug1: private host key: #0 type 0 RSA1
debug3: Not a RSA1 key file /etc/openssh/ssh_host_rsa_key.
debug1: read PEM private key done: type RSA
debug1: private host key: #1 type 1 RSA
debug3: Not a RSA1 key file /etc/openssh/ssh_host_dsa_key.
debug1: read PEM private key done: type DSA
debug1: private host key: #2 type 2 DSA
debug1: Bind to port 2022 on 0.0.0.0.
Server listening on 0.0.0.0 port 2022.
Generating 768 bit RSA key.
RSA key generation complete.
debug1: Server will not fork when running in debugging mode.
Connection from 127.0.0.1 port 4416
debug1: Client protocol version 2.0; client software version OpenSSH_3.7.1p2
debug1: match: OpenSSH_3.7.1p2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-1.99-OpenSSH_3.7.1p2
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-
group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-
ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-
ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-
group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-
ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se,aes128-ctr,aes192-
ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug2: dh_gen_key: priv key bits set: 121/256
debug2: bits set: 1602/3191
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug2: bits set: 1556/3191
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user Vssh_U service ssh-connection method none
debug1: attempt 0 failures 0
debug3: allowed_user: today 12327 sp_expire 13878 sp_lstchg 12327 sp_max 168
debug2: input_userauth_request: setting up authctxt for Vssh_U
debug2: input_userauth_request: try method none
Failed none for Vssh_U from 127.0.0.1 port 4416 ssh2
debug1: userauth-request for user Vssh_U service ssh-connection method password
debug1: attempt 1 failures 1
debug2: input_userauth_request: try method password
Accepted password for Vssh_U from 127.0.0.1 port 4416 ssh2
debug1: Entering interactive session for SSH2.
debug2: fd 3 setting O_NONBLOCK
debug2: fd 7 setting O_NONBLOCK
debug1: server_init_dispatch_20
debug1: server_input_channel_open: ctype session rchan 0 win 65536 max 16384
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/pts/6
debug3: tty_parse_modes: SSH2 n_bytes 266
debug3: tty_parse_modes: ospeed 9600
debug3: tty_parse_modes: ispeed 9600
debug3: tty_parse_modes: 1 127
debug3: tty_parse_modes: 2 28
debug3: tty_parse_modes: 3 8
debug3: tty_parse_modes: 4 24
debug3: tty_parse_modes: 5 4
debug3: tty_parse_modes: 6 0
debug3: tty_parse_modes: 7 0
debug3: tty_parse_modes: 8 17
debug3: tty_parse_modes: 9 19
debug3: tty_parse_modes: 10 26
debug3: tty_parse_modes: 11 0
debug3: tty_parse_modes: 12 18
debug3: tty_parse_modes: 13 23
debug3: tty_parse_modes: 14 4
debug3: tty_parse_modes: 16 0
debug3: tty_parse_modes: 18 15
debug3: tty_parse_modes: 30 0
debug3: tty_parse_modes: 31 0
debug3: tty_parse_modes: 32 0
debug3: tty_parse_modes: 33 1
debug3: tty_parse_modes: 34 0
debug3: tty_parse_modes: 35 0
debug3: tty_parse_modes: 36 1
debug3: tty_parse_modes: 37 0
debug3: tty_parse_modes: 38 1
debug3: tty_parse_modes: 39 0
debug3: tty_parse_modes: 40 0
debug3: tty_parse_modes: 41 0
debug3: tty_parse_modes: 50 1
debug3: tty_parse_modes: 51 1
debug3: tty_parse_modes: 52 0
debug3: tty_parse_modes: 53 1
debug3: tty_parse_modes: 54 1
debug3: tty_parse_modes: 55 1
debug3: tty_parse_modes: 56 0
debug3: tty_parse_modes: 57 0
debug3: tty_parse_modes: 58 0
debug3: tty_parse_modes: 59 0
debug3: tty_parse_modes: 60 0
debug3: tty_parse_modes: 61 0
debug3: tty_parse_modes: 62 0
debug3: tty_parse_modes: 70 1
debug3: tty_parse_modes: 71 0
debug3: tty_parse_modes: 72 1
debug3: tty_parse_modes: 73 0
debug3: tty_parse_modes: 74 0
debug3: tty_parse_modes: 75 0
debug3: tty_parse_modes: 90 1
debug3: tty_parse_modes: 91 1
debug3: tty_parse_modes: 92 0
debug3: tty_parse_modes: 93 0
debug1: server_input_channel_req: channel 0 request shell reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
setsid: Not owner
debug2: fd 4 setting TCP_NODELAY
debug2: channel 0: rfd 9 isatty
debug2: fd 9 setting O_NONBLOCK
debug2: fd 8 is O_NONBLOCK
debug1: Received SIGCHLD.
debug1: session_by_pid: pid 27912
debug1: session_exit_message: session 0 channel 0 pid 27912
debug2: channel 0: request exit-status
debug1: session_exit_message: release channel 0
debug2: channel 0: write failed
debug2: channel 0: close_write
debug2: channel 0: output open -> closed
debug1: session_close: session 0 pid 27912
debug1: session_pty_cleanup: session 0 release /dev/pts/6
debug2: notify_done: reading
debug2: channel 0: read<=0 rfd 9 len 0
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug2: channel 0: input drain -> closed
debug2: channel 0: send close
debug3: channel 0: will not send data after close
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: server-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 server-session (t4 r0 i3/0 o3/0 fd -1/-1)

debug3: channel 0: close_fds r -1 w -1 e -1
Connection closed by 127.0.0.1
Closing connection to 127.0.0.1
#


ssh -p 2022 -l Vssh_U localhost
Vssh_U at localhost's password: 
debug3: Trying to reverse map address 127.0.0.1.

Last login: Thu Oct  2 13:02:19 2003 from .....

debug1: permanently_set_uid: 106/1

: was able to restore old [e]uid



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