I've verified on two machines running XP Pro with up-to-date Cygwin
installations that upgrading from openssh 3.8.1p1-1 to openssh 3.9p1-1
breaks sshd when running with privilege separation (the default).
Clients (including "ssh localhost") can not log into the Cygwin sshd.
Either turning off privilege separation in /etc/sshd_config or
downgrading and rebooting resolves the problem.
I have no further insight into this problem; I mainly want just to report it.
When a client tries to log in to 3.9p1-1 sshd, the -v -v -v output
leading up to the problem is:
debug2: channel 0: request shell
debug2: fd 3 setting TCP_NODELAY
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 eof
debug2: channel 0: output open -> drain
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
debug1: getpeername: Socket operation on non-socket
debug1: do_cleanup
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
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 6
Connection to 192.168.0.234 closed.
debug1: Transferred: stdin 0, stdout 0, stderr 37 bytes in 0.1 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 398.5
debug1: Exit status 255
[beth] swift>
The corresponding Cygwin sshd "-d -d -d" output (from start to end)
is the following (I've deleted actual ssh keys from the output). The
home directory of user "swift" is /cygdrive/c/swift rather than the
default "/home/swift".
debug2: load_server_config: filename /etc/sshd_config
debug2: load_server_config: done config len = 266
debug2: parse_server_config: config /etc/sshd_config len 266
debug1: sshd version OpenSSH_3.9p1
debug3: Not a RSA1 key file /etc/ssh_host_rsa_key.
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug3: Not a RSA1 key file /etc/ssh_host_dsa_key.
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-D'
debug1: rexec_argv[2]='-e'
debug1: rexec_argv[3]='-d'
debug1: rexec_argv[4]='-d'
debug1: rexec_argv[5]='-d'
debug2: fd 3 setting O_NONBLOCK
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug3: fd 4 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 7 config len 266
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 4 out 4 newsock 4 pipe -1 sock 7
debug3: recv_rexec_state: entering fd = 5
debug3: ssh_msg_recv entering
debug3: recv_rexec_state: done
debug2: parse_server_config: config rexec len 266
debug1: sshd version OpenSSH_3.9p1
debug3: Not a RSA1 key file /etc/ssh_host_rsa_key.
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug3: Not a RSA1 key file /etc/ssh_host_dsa_key.
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
debug1: inetd sockets after dupping: 3, 3
Connection from 192.168.0.2 port 39493
debug1: Client protocol version 2.0; client software version OpenSSH_3.8.1p1
Debian 1:3.8.1p1-4
debug1: match: OpenSSH_3.8.1p1 Debian 1:3.8.1p1-4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.9p1
debug2: fd 3 setting O_NONBLOCK
debug2: Network child is on pid 2716
debug3: preauth child monitor started
debug3: mm_request_receive entering
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-group14-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,[EMAIL
PROTECTED],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,[EMAIL
PROTECTED],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[EMAIL
PROTECTED],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[EMAIL
PROTECTED],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,[EMAIL
PROTECTED],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit:
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,[EMAIL
PROTECTED],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[EMAIL
PROTECTED],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[EMAIL
PROTECTED],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
debug3: mm_request_send entering: type 0
debug3: monitor_read: checking request 0
debug3: mm_answer_moduli: got parameters: 1024 1024 8192
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI
debug3: mm_request_receive_expect entering: type 1
debug3: mm_request_receive entering
debug3: mm_request_send entering: type 1
debug3: mm_choose_dh: remaining 0
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug2: dh_gen_key: priv key bits set: 133/256
debug2: bits set: 500/1024
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug2: monitor_read: 0 used once, disabling now
debug3: mm_request_receive entering
debug2: bits set: 484/1024
debug3: mm_key_sign entering
debug3: mm_request_send entering: type 4
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN
debug3: mm_request_receive_expect entering: type 5
debug3: mm_request_receive entering
debug3: monitor_read: checking request 4
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x100ea4a8(143)
debug3: mm_request_send entering: type 5
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: monitor_read: 4 used once, disabling now
debug3: mm_request_receive entering
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user swift service ssh-connection method none
debug1: attempt 0 failures 0
debug3: mm_getpwnamallow entering
debug3: mm_request_send entering: type 6
debug3: monitor_read: checking request 6
debug3: mm_answer_pwnamallow
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug3: mm_request_receive entering
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM
debug3: mm_request_receive_expect entering: type 7
debug3: mm_request_receive entering
debug2: input_userauth_request: setting up authctxt for swift
debug3: mm_inform_authserv entering
debug3: mm_request_send entering: type 3
debug3: monitor_read: checking request 3
debug3: mm_answer_authserv: service=ssh-connection, style=
debug2: monitor_read: 3 used once, disabling now
debug3: mm_request_receive entering
debug2: input_userauth_request: try method none
debug3: mm_auth_password entering
debug3: mm_request_send entering: type 10
debug3: monitor_read: checking request 10
debug3: mm_answer_authpassword: sending result 0
debug3: mm_request_send entering: type 11
Failed none for swift from 192.168.0.2 port 39493 ssh2
debug3: mm_request_receive entering
debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD
debug3: mm_request_receive_expect entering: type 11
debug3: mm_request_receive entering
debug3: mm_auth_password: user not authenticated
Failed none for swift from 192.168.0.2 port 39493 ssh2
debug1: userauth-request for user swift service ssh-connection method publickey
debug1: attempt 1 failures 1
debug2: input_userauth_request: try method publickey
debug1: test whether pkalg/pkblob are acceptable
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 20
debug3: monitor_read: checking request 20
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x100e2d60
debug1: temporarily_use_uid: 1003/544 (e=18/544)
debug1: trying public key file /cygdrive/c/swift/.ssh/authorized_keys
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug3: key_read: type mismatch
debug2: user_key_allowed: check options: 'ssh-dss AAAAB---etc
'
debug2: key_type_from_name: unknown key type 'AAAAB---etc
debug3: key_read: missing keytype
debug2: user_key_allowed: advance: 'AAAAB---etc
'
debug1: restore_uid: (unprivileged)
debug2: key not found
debug1: temporarily_use_uid: 1003/544 (e=18/544)
debug1: trying public key file /cygdrive/c/swift/.ssh/authorized_keys2
debug1: restore_uid: (unprivileged)
debug3: mm_answer_keyallowed: key 0x100e2d60 is disallowed
debug3: mm_request_send entering: type 21
debug3: mm_request_receive entering
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 21
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 0 pkalg ssh-rsa
Failed publickey for swift from 192.168.0.2 port 39493 ssh2
debug1: userauth-request for user swift service ssh-connection method publickey
debug1: attempt 2 failures 2
debug2: input_userauth_request: try method publickey
debug1: test whether pkalg/pkblob are acceptable
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 20
debug3: monitor_read: checking request 20
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x100e2d80
debug1: temporarily_use_uid: 1003/544 (e=18/544)
debug1: trying public key file /cygdrive/c/swift/.ssh/authorized_keys
debug1: matching key found: file /cygdrive/c/swift/.ssh/authorized_keys, line 1
Found matching DSA key: eb:c5:5d:0e:49:19:9d:93:a1:53:7f:bc:25:64:11:0a
debug1: restore_uid: (unprivileged)
debug3: mm_answer_keyallowed: key 0x100e2d80 is allowed
debug3: mm_request_send entering: type 21
debug3: mm_request_receive entering
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 21
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss
Postponed publickey for swift from 192.168.0.2 port 39493 ssh2
debug1: userauth-request for user swift service ssh-connection method publickey
debug1: attempt 3 failures 2
debug2: input_userauth_request: try method publickey
debug3: mm_key_allowed entering
debug3: mm_request_send entering: type 20
debug3: monitor_read: checking request 20
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x100e2728
debug1: temporarily_use_uid: 1003/544 (e=18/544)
debug1: trying public key file /cygdrive/c/swift/.ssh/authorized_keys
debug1: matching key found: file /cygdrive/c/swift/.ssh/authorized_keys, line 1
Found matching DSA key: eb:c5:5d:0e:49:19:9d:93:a1:53:7f:bc:25:64:11:0a
debug1: restore_uid: (unprivileged)
debug3: mm_answer_keyallowed: key 0x100e2728 is allowed
debug3: mm_request_send entering: type 21
debug3: mm_request_receive entering
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED
debug3: mm_request_receive_expect entering: type 21
debug3: mm_request_receive entering
debug3: mm_key_verify entering
debug3: mm_request_send entering: type 22
debug3: mm_key_verify: waiting for MONITOR_ANS_KEYVERIFY
debug3: mm_request_receive_expect entering: type 23
debug3: mm_request_receive entering
debug3: monitor_read: checking request 22
debug1: ssh_dss_verify: signature correct
debug3: mm_answer_keyverify: key 0x100e2d50 signature verified
debug3: mm_request_send entering: type 23
Accepted publickey for swift from 192.168.0.2 port 39493 ssh2
debug1: monitor_child_preauth: swift has been authenticated by privileged process
debug3: mm_get_keystate: Waiting for new keys
debug3: mm_request_receive_expect entering: type 24
debug3: mm_request_receive entering
debug2: userauth_pubkey: authenticated 1 pkalg ssh-dss
Accepted publickey for swift from 192.168.0.2 port 39493 ssh2
debug3: mm_send_keystate: Sending new keys: 0x100eb820 0x100eb7d8
debug3: mm_newkeys_to_blob: converting 0x100eb820
debug3: mm_newkeys_to_blob: converting 0x100eb7d8
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_newkeys_from_blob: 0x100e9680(118)
debug2: mac_init: found hmac-md5
debug3: mm_get_keystate: Waiting for second key
debug3: mm_newkeys_from_blob: 0x100e9680(118)
debug2: mac_init: found hmac-md5
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
debug3: mm_send_keystate: Finished sending state
debug2: set_newkeys: mode 0
debug2: set_newkeys: mode 1
debug1: Entering interactive session for SSH2.
debug2: fd 4 setting O_NONBLOCK
debug2: fd 5 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/tty7
debug3: tty_parse_modes: SSH2 n_bytes 256
debug3: tty_parse_modes: ospeed 38400
debug3: tty_parse_modes: ispeed 38400
debug3: tty_parse_modes: 1 3
debug3: tty_parse_modes: 2 28
debug3: tty_parse_modes: 3 127
debug3: tty_parse_modes: 4 21
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: 12 18
debug3: tty_parse_modes: 13 23
debug3: tty_parse_modes: 14 22
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 0
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
debug1: Ignoring unsupported tty mode opcode 52 (0x34)
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 1
debug3: tty_parse_modes: 60 1
debug3: tty_parse_modes: 61 1
debug1: Ignoring unsupported tty mode opcode 62 (0x3e)
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
debug2: fd 3 setting TCP_NODELAY
debug2: channel 0: rfd 7 isatty
debug2: fd 7 setting O_NONBLOCK
debug2: fd 6 setting O_NONBLOCK
debug1: Received SIGCHLD.
debug1: session_by_pid: pid 376
debug1: session_exit_message: session 0 channel 0 pid 376
debug2: channel 0: request exit-status confirm 0
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 376
debug1: session_pty_cleanup: session 0 release /dev/tty7
syslogin_perform_logout: logout() returned an error
debug2: notify_done: reading
debug2: channel 0: read<=0 rfd 7 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 cfd -1)
debug3: channel 0: close_fds r -1 w -1 e -1 c -1
Connection closed by 192.168.0.2
debug1: do_cleanup
Closing connection to 192.168.0.2
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