[Bug 1638338] Re: Can not ssh with tr_TR.UTF-8 locales (Bad configuration options)

[Onur Güzel]

I have encountered this bug today. You can reproduce it by launching ssh
in Turkish locale environment:

LC_ALL=tr_TR.UTF8 ssh user at example.com

Ubuntu version is 16.10, and openssh-client version is 1:7.3p1-1. I
guess the client converts parameters in config files to lowercase when
parsing and gives error because both GSSAPIAuthentication and
GSSAPIDelegateCredentials parameters has "I" character.

Turkish have two separate "i" character dotted and dotless. Per the
Unicode standard, our lowercase "i" becomes "İ" (U+0130 "Latin Capital
Letter I With Dot Above") when it moves to uppercase. Similarly, our
uppercase "I" becomes "ı" (U+0131 "Latin Small Letter Dotless I") when
it moves to lowercase.

For additional info, you can check out the links below:
http://www.moserware.com/2008/02/does-your-code-pass-turkey-test.html
https://blog.codinghorror.com/whats-wrong-with-turkey/
http://mattryall.net/blog/2009/02/the-infamous-turkish-locale-bug

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https://bugs.launchpad.net/bugs/1638338

Title:
  Can not ssh with tr_TR.UTF-8 locales (Bad configuration options)

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  I can not ssh to any host with Turkish locales.

  What I expected to happen:

      I expected that 'ssh some_host' command would successfully run.

  What actually happened

      'ssh some_host' command failed with an error.

  Steps to produce:

  1. Open a terminal
  2. Run LANG=tr_TR.UTF-8 ssh some_host

  If I run ssh with tr_TR.UTF-8 locale, the first error I get is:

      $HOME/.ssh/config: line 7: Bad configuration option: Identityfile
      $HOME/.ssh/config: terminating, 1 bad configuration options

  If I commend IdentityFile option from $HOME/.ssh/config file and re-
  run the command, I get this:

      debug1: Reading configuration data ~/.ssh/config
      debug1: Reading configuration data /etc/ssh/ssh_config
      debug1: /etc/ssh/ssh_config line 19: Applying options for *
      /etc/ssh/ssh_config: line 55: Bad configuration option: gssapIauthentication
      /etc/ssh/ssh_config: line 56: Bad configuration option: gssapIdelegatecredentials
      /etc/ssh/ssh_config: terminating, 2 bad configuration options

  If I commend GSSAPIAuthentication and GSSAPIDelegateCredentials
  option, I can ssh to a host.

  So to ssh to a host with tr_TR.UTF-8 locale, one must commend out
  IdentityFile, if it is used, GSSAPIAuthentication and
  GSSAPIDelegateCredentials optons.

  Workaround:

      LC_ALL=C ssh some_host

  
  LC_ALL=C apt-cache policy openssh-client
  openssh-client:
    Installed: 1:7.3p1-1
    Candidate: 1:7.3p1-1
    Version table:
   *** 1:7.3p1-1 500
          500 http://archive.ubuntu.com/ubuntu yakkety/main amd64 Packages
          100 /var/lib/dpkg/status

  LC_ALL=C lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 16.10
  Release:	16.10
  Codename:	yakkety

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: openssh-client 1:7.3p1-1
  ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
  Uname: Linux 4.8.0-26-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Nov  1 19:37:35 2016
  InstallationDate: Installed on 2016-10-23 (9 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  RelatedPackageVersions:
   ssh-askpass       N/A
   libpam-ssh        N/A
   keychain          N/A
   ssh-askpass-gnome N/A
  SSHClientVersion: OpenSSH_7.3p1 Ubuntu-1, OpenSSL 1.0.2g  1 Mar 2016
  SourcePackage: openssh
  UpgradeStatus: No upgrade log present (probably fresh install)

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