[Bug 2764] New: Some Windows username get case-sensitive in sshd

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2764

            Bug ID: 2764
           Summary: Some Windows username get case-sensitive in sshd
           Product: Portable OpenSSH
           Version: 7.2p2
          Hardware: ARM64
                OS: Cygwin on NT/2k
            Status: NEW
          Severity: security
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: arvindo.kinny at cerner.com

Some windows 2012 users usernames get case-sensitive on Cygwin sshd

Version
Cygwin 2.5.1 and OpenSSH_7.2p2, OpenSSL 1.0.2h 3 May 2016
Some users work with any case username


Example:
Windows Active Directory Username: MyUser
SSH username not working: myUser

Here are the debug log statements

sshd debug log

debug1: KEX done
debug3: receive packet: type 5
debug3: send packet: type 6
debug3: receive packet: type 50
debug1: userauth-request for user myUser service ssh-connection method
none
debug1: attempt 0 failures 0
debug2: parse_server_config: config reprocess config len 367
Login name myUser does not match stored username MyUser
Invalid user myUser from 10.175.2.139
input_userauth_request: invalid user myUser
debug2: input_userauth_request: try method none
Failed none for invalid user myUser from 10.175.2.139 port 64504 ssh2
debug3: userauth_finish: failure partial=0 next
methods="publickey,password,keyboard-interactive"
debug3: send packet: type 51
debug3: receive packet: type 50
debug1: userauth-request for user myUser service ssh-connection method
keyboard-interactive
debug1: attempt 1 failures 0
debug2: input_userauth_request: try method keyboard-interactive
debug1: keyboard-interactive devs 
debug1: auth2_challenge: user=myUser devs=
debug1: kbdint_alloc: devices ''
debug2: auth2_challenge_start: devices 
Failed keyboard-interactive for invalid user myUser from 10.175.2.139
port 64504 ssh2
debug3: userauth_finish: failure partial=0 next
methods="publickey,password,keyboard-interactive"
debug3: send packet: type 51
debug3: receive packet: type 50
debug1: userauth-request for user myUser service ssh-connection method
password
debug1: attempt 2 failures 1
debug2: input_userauth_request: try method password

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