? about portable version of sshd crashing

[Brad Walker]

I am porting over the portable version of openssh to our uCLinux
implementation. Everything has worked with minimal effort and I appreciate
all the work.

But, I am having a problem whereby the sshd executable is crashing and I
really could use some help on where to look at this in more details.

Here is how I start up the sshd for testing.

/usr/sbin/sshd -D -ddd -f /etc/ssh/sshd_config -p 65

Then I connect to it with the folloiwng command

sshd -vvv admin@<ip addr> -p 65

It connects with no problem. But, when I hit the return key I get a big fat
error..

I've attached the debug output at the end of this email.

Any advice on where to start debugging this is most appreciated.

Thanks.

-brad w.

/bin # /usr/sbin/sshd -D -ddd -f /etc/ssh/sshd_config -p 65
debug2: load_server_config: filename /etc/ssh/sshd_config
debug2: load_server_config: done config len = 852
debug2: parse_server_config: config /etc/ssh/sshd_config len 852
debug3: /etc/ssh/sshd_config:18 setting AddressFamily inet
debug3: /etc/ssh/sshd_config:21 setting ListenAddress 192.168.0.2
debug3: /etc/ssh/sshd_config:27 setting HostKey /etc/ssh/ssh_host_key
debug3: /etc/ssh/sshd_config:29 setting HostKey /etc/ssh/ssh_host_rsa_key
debug3: /etc/ssh/sshd_config:30 setting HostKey /etc/ssh/ssh_host_dsa_key
debug3: /etc/ssh/sshd_config:34 setting KeyRegenerationInterval 1h
debug3: /etc/ssh/sshd_config:35 setting ServerKeyBits 1024
debug3: /etc/ssh/sshd_config:43 setting SyslogFacility AUTHPRIV
debug3: /etc/ssh/sshd_config:54 setting RSAAuthentication yes
debug3: /etc/ssh/sshd_config:55 setting PubkeyAuthentication yes
debug3: /etc/ssh/sshd_config:72 setting IgnoreUserKnownHosts yes
debug3: /etc/ssh/sshd_config:74 setting IgnoreRhosts yes
debug3: /etc/ssh/sshd_config:77 setting PasswordAuthentication yes
debug3: /etc/ssh/sshd_config:78 setting PermitEmptyPasswords yes
debug3: /etc/ssh/sshd_config:79 setting PasswordAuthentication yes
debug3: /etc/ssh/sshd_config:83 setting ChallengeResponseAuthentication no
debug3: /etc/ssh/sshd_config:111 setting UsePAM no
/etc/ssh/sshd_config line 111: Unsupported option UsePAM
debug3: /etc/ssh/sshd_config:116 setting X11Forwarding no
debug3: /etc/ssh/sshd_config:129 setting UseDNS no
debug3: /etc/ssh/sshd_config:140 setting AcceptEnv LANG LC_CTYPE LC_NUMERIC
LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
debug3: /etc/ssh/sshd_config:141 setting AcceptEnv LC_PAPER LC_NAME
LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
debug3: /etc/ssh/sshd_config:142 setting AcceptEnv LC_IDENTIFICATION LC_ALL
LANGUAGE
debug3: /etc/ssh/sshd_config:143 setting AcceptEnv XMODIFIERS
debug3: /etc/ssh/sshd_config:146 setting Subsystem sftp
/usr/local/libexec/sftp-server
debug1: sshd version OpenSSH_6.7, OpenSSL 1.0.1g 7 Apr 2014

debug1: private host key: #0 type 0 RSA1
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/ssh/ssh_host_rsa_key" as a RSA1 public key
debug1: private host key: #1 type 1 RSA
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/ssh/ssh_host_dsa_key" as a RSA1 public key
debug1: private host key: #2 type 2 DSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-D'
debug1: rexec_argv[2]='-ddd'
debug1: rexec_argv[3]='-f'
debug1: rexec_argv[4]='/etc/ssh/sshd_config'
debug1: rexec_argv[5]='-p'
debug1: rexec_argv[6]='65'
debug2: fd 4 setting O_NONBLOCK
debug1: Bind to port 65 on 192.168.0.2.
Server listening on 192.168.0.2 port 65.
debug3: fd 5 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 852
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: rexec_argv[0]: /usr/sbin/sshd

debug1: inetd sockets after dupping: 4, 4
Connection from 192.168.0.65 port 59719 on 192.168.0.2 port 65
debug1: Client protocol version 2.0; client software version OpenSSH_6.4
debug1: match: OpenSSH_6.4 pat OpenSSH* compat 0x04000000
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.7
debug2: fd 4 setting O_NONBLOCK
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: curve25519-sha256 at libssh.org
,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss

..
<bunch of key exchange info deleted here>
..

debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib at openssh.com,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_setup: setup umac-64-etm at openssh.com
debug1: kex: client->server aes128-ctr umac-64-etm at openssh.com none
debug2: mac_setup: setup umac-64-etm at openssh.com
debug1: kex: server->client aes128-ctr umac-64-etm at openssh.com none
debug1: expecting SSH2_MSG_KEX_ECDH_INIT
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 admin service ssh-connection method none
debug1: attempt 0 failures 0
debug2: parse_server_config: config reprocess config len 852
debug3: auth_shadow_acctexpired: today 2 sp_expire -1 days left -3
debug3: account expiration disabled
debug2: input_userauth_request: setting up authctxt for admin
debug2: input_userauth_request: try method none
debug3: auth_shadow_pwexpired: today 2 sp_lstchg -1 sp_max 99999
Failed none for admin from 192.168.0.65 port 59719 ssh2
debug3: userauth_finish: failure partial=0 next methods="publickey,password"
debug1: userauth-request for user admin service ssh-connection method
password
debug1: attempt 1 failures 0
debug2: input_userauth_request: try method password
Accepted password for admin from 192.168.0.65 port 59719 ssh2
debug1: Entering interactive session for SSH2.
debug2: fd 5 setting O_NONBLOCK
debug2: fd 6 setting O_NONBLOCK
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]
debug2: session_new: allocate (allocated 0 max 10)
debug3: session_unused: session id 0 unused
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.comwant_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/pts/1
debug1: server_input_channel_req: channel 0 request env reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req env
debug2: Setting env 0: XMODIFIERS=@im=ibus
debug1: server_input_channel_req: channel 0 request env reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req env
debug2: Setting env 1: LANG=en_US.UTF-8
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
Starting session: shell on pts/1 for admin from 192.168.0.65 port 59719
debug1: Setting controlling tty using TIOCSCTTY.
debug2: fd 4 setting TCP_NODELAY
debug3: packet_set_tos: set IP_TOS 0x10
debug2: channel 0: rfd 9 isatty
debug2: fd 9 setting O_NONBLOCK
fcntl(7, F_GETFL, 0): Bad file descriptor
select: Bad file descriptor
select: Bad file descriptor
select: Bad file descriptor

....

and it just continues..