Setting up cygwin sshd

I couldn’t manage to get public key authentication to work for the cygwin ssh server. It just kept rejecting my key for no apparant reason, the permissions on all the files were correct and the server itself was configured fine. The problem turned out to be windows permissions.

Failure output:

Connection from $IP port 36230
debug1: Client protocol version 2.0; client software version OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: match: OpenSSH_3.8.1p1 Debian-8.sarge.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.9p1
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: client->server aes128-cbc hmac-md5 none
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
debug1: expecting SSH2_MSG_KEX_DH_GEX_INI
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user user service ssh-connection method none
debug1: attempt 0 failures 0
Failed none for user from $IP port 36230 ssh2
debug1: userauth-request for user user service ssh-connection method publickey
debug1: attempt 1 failures 1
debug1: test whether pkalg/pkblob are acceptable
debug1: temporarily_use_uid: n/n (e=n/n)
debug1: trying public key file /home/user/.ssh/authorized_keys
debug1: restore_uid: (unprivileged)
debug1: temporarily_use_uid: n/n (e=n/n)
debug1: trying public key file /home/user/.ssh/authorized_keys
debug1: restore_uid: (unprivileged)
Failed publickey for user from $IP port 36230 ssh2

Fix:

setfacl -m u:system:r– ~ ~/.ssh ~/.ssh/authorized_keys

found here.

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