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Date:	Wed, 19 Mar 2014 11:37:52 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin <cygwin AT cygwin DOT com>
Subject:	Public key authorization problem with latest snapshot
X-IsSubscribed:	yes

Here's some more weirdness involving the recent changes to exception 
handling on 64-bit Cygwin.

I have an ordinary user kbrown and an administrator user kbrown-admin. 
I use the following command to simulate "su":

   ssh kbrown-admin@$(hostname) .

With the current (2014-03-18) x86_64 snapshot, this doesn't work if I 
try to use public key authorization.  I simply get a message

   Connection closed by fe80::81db:bf3a:6434:6015%11

and I'm not even prompted for my passphrase [*].  But if I move my 
id_rsa and id_rsa.pub out of the way, I'm prompted for a password, and I 
can login successfully.

Reverting to the 2014-03-17 snapshot fixes the problem.

Ken

[*] Here's the result of using ssh -vv, in case it provides a clue:

OpenSSH_6.6, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/kbrown/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to desktop-new [fe80::81db:bf3a:6434:6015%11] port 22.
debug1: Connection established.
debug1: identity file /home/kbrown/.ssh/id_rsa type 1
debug1: identity file /home/kbrown/.ssh/id_rsa-cert type -1
debug1: identity file /home/kbrown/.ssh/id_dsa type -1
debug1: identity file /home/kbrown/.ssh/id_dsa-cert type -1
debug1: identity file /home/kbrown/.ssh/id_ecdsa type -1
debug1: identity file /home/kbrown/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/kbrown/.ssh/id_ed25519 type -1
debug1: identity file /home/kbrown/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6
debug1: match: OpenSSH_6.6 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
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-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
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
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se
debug2: kex_parse_kexinit: 
hmac-md5-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,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-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-sha1,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,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-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-sha1,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com,zlib
debug2: kex_parse_kexinit: none,zlib AT openssh DOT 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: 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-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com,chacha20-poly1305 AT openssh DOT com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc AT lysator DOT liu DOT se
debug2: kex_parse_kexinit: 
hmac-md5-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,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-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-sha1,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,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-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-sha1,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160 AT openssh DOT com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com
debug2: kex_parse_kexinit: none,zlib AT openssh DOT com
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 hmac-md5-etm AT openssh DOT com
debug1: kex: server->client aes128-ctr hmac-md5-etm AT openssh DOT com none
debug2: mac_setup: setup hmac-md5-etm AT openssh DOT com
debug1: kex: client->server aes128-ctr hmac-md5-etm AT openssh DOT com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA 
0f:ff:3f:f3:82:5e:ca:cd:90:a7:cd:bf:ae:51:60:4b
debug1: Host 'desktop-new' is known and matches the ECDSA host key.
debug1: Found key in /home/kbrown/.ssh/known_hosts:1
debug1: ssh_ecdsa_verify: signature correct
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: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/kbrown/.ssh/id_rsa (0x60006d9e0),
debug2: key: /home/kbrown/.ssh/id_dsa (0x0),
debug2: key: /home/kbrown/.ssh/id_ecdsa (0x0),
debug2: key: /home/kbrown/.ssh/id_ed25519 (0x0),
debug1: Authentications that can continue: 
publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/kbrown/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
Connection closed by fe80::81db:bf3a:6434:6015%11


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