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Message-ID:	<54A672F7.2010104@nokia.com>
Date:	Fri, 02 Jan 2015 12:29:11 +0200
From:	Ilya Dogolazky <ilya DOT dogolazky AT nokia DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Never ending SSHD story: offering public key terminates connection
References:	<54A485DE DOT 1090802 AT nokia DOT com>
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A small follow up about this: I found a registry string
Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\sshd\Parameters\AppArgs
and changed the sshd command line parameters from "-D" to "-d -d -d"

This was enough to receive the server log in /var/log/sshd.log (attached 
here). The interesting line in the file is in my opinion this one:

"seteuid 1001: Operation not permitted"

The number "1001" is the UID of the user ilya.

Thus something seems to be wrong with permissions in the system.

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Content-Type: text/x-log;
 name="sshd.log"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="sshd.log"

debug2: load_server_config: filename /etc/sshd_config
debug2: load_server_config: done config len = 235
debug2: parse_server_config: config /etc/sshd_config len 235
debug3: /etc/sshd_config:54 setting AuthorizedKeysFile .ssh/authorized_keys
debug3: /etc/sshd_config:110 setting UsePrivilegeSeparation yes
debug3: /etc/sshd_config:126 setting Subsystem sftp	/usr/sbin/sftp-server
debug1: sshd version OpenSSH_6.7, OpenSSL 1.0.1j 15 Oct 2014
debug1: private host key: #0 type 1 RSA
debug1: private host key: #1 type 2 DSA
debug1: private host key: #2 type 3 ECDSA
debug1: private host key: #3 type 4 ED25519
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
debug1: rexec_argv[2]='-d'
debug1: rexec_argv[3]='-d'
debug2: fd 3 setting O_NONBLOCK
debug3: sock_set_v6only: set socket 3 IPV6_V6ONLY
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug2: fd 4 setting O_NONBLOCK
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: fd 5 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 235
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: inetd sockets after dupping: 3, 3
Connection from ::1 port 49235 on ::1 port 22
debug1: Client protocol version 2.0; client software version OpenSSH_6.7
debug1: match: OpenSSH_6.7 pat OpenSSH* compat 0x04000000
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.7
debug2: fd 3 setting O_NONBLOCK
debug2: Network child is on pid 2504
debug3: preauth child monitor started
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug2: kex_parse_kexinit: curve25519-sha256 AT libssh DOT org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1 [preauth]
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com [preauth]
debug2: kex_parse_kexinit: umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
debug2: kex_parse_kexinit: umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth]
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com [preauth]
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0  [preauth]
debug2: kex_parse_kexinit: reserved 0  [preauth]
debug2: kex_parse_kexinit: curve25519-sha256 AT libssh DOT org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp384-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp521-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01 AT openssh DOT com,ssh-rsa-cert-v01 AT openssh DOT com,ssh-dss-cert-v01 AT openssh DOT com,ssh-rsa-cert-v00 AT openssh DOT com,ssh-dss-cert-v00 AT openssh DOT com,ssh-ed25519,ssh-rsa,ssh-dss [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se [preauth]
debug2: kex_parse_kexinit: umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5-etm AT openssh DOT com,hmac-ripemd160-etm AT openssh DOT com,hmac-sha1-96-etm AT openssh DOT com,hmac-md5-96-etm AT openssh DOT com,hmac-md5,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5-etm AT openssh DOT com,hmac-ripemd160-etm AT openssh DOT com,hmac-sha1-96-etm AT openssh DOT com,hmac-md5-96-etm AT openssh DOT com,hmac-md5,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com,zlib [preauth]
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com,zlib [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0  [preauth]
debug2: kex_parse_kexinit: reserved 0  [preauth]
debug2: mac_setup: setup umac-64-etm AT openssh DOT com [preauth]
debug1: kex: client->server aes128-ctr umac-64-etm AT openssh DOT com none [preauth]
debug2: mac_setup: setup umac-64-etm AT openssh DOT com [preauth]
debug1: kex: server->client aes128-ctr umac-64-etm AT openssh DOT com none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug3: mm_key_sign entering [preauth]
debug3: mm_request_send entering: type 6 [preauth]
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN [preauth]
debug3: mm_request_receive_expect entering: type 7 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x60005bda0(99)
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug2: kex_derive_keys [preauth]
debug2: set_newkeys: mode 1 [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug2: set_newkeys: mode 0 [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user ilya service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug3: mm_getpwnamallow entering [preauth]
debug3: mm_request_send entering: type 8 [preauth]
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM [preauth]
debug3: mm_request_receive_expect entering: type 9 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 8
debug3: mm_answer_pwnamallow
debug3: Trying to reverse map address ::1.
Address ::1 maps to w9, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
debug2: parse_server_config: config reprocess config len 235
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 9
debug2: monitor_read: 8 used once, disabling now
debug2: input_userauth_request: setting up authctxt for ilya [preauth]
debug3: mm_inform_authserv entering [preauth]
debug3: mm_request_send entering: type 4 [preauth]
debug2: input_userauth_request: try method none [preauth]
debug3: userauth_finish: failure partial=0 next methods="publickey,password,keyboard-interactive" [preauth]
debug1: userauth-request for user ilya service ssh-connection method publickey [preauth]
debug1: attempt 1 failures 0 [preauth]
debug2: input_userauth_request: try method publickey [preauth]
debug1: test whether pkalg/pkblob are acceptable [preauth]
debug3: mm_key_allowed entering [preauth]
debug3: mm_request_send entering: type 22 [preauth]
debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED [preauth]
debug3: mm_request_receive_expect entering: type 23 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 4
debug3: mm_answer_authserv: service=ssh-connection, style=
debug2: monitor_read: 4 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 22
debug3: mm_answer_keyallowed entering
debug3: mm_answer_keyallowed: key_from_blob: 0x60005afe0
debug1: temporarily_use_uid: 1001/513 (e=18/544)
seteuid 1001: Operation not permitted
debug1: do_cleanup
debug1: Killing privsep child 2504


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