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Mail Archives: cygwin/2015/01/08/08:19:48

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X-HELO: calimero.vinschen.de
Date: Thu, 8 Jan 2015 14:19:22 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Fix for ssh-user-config /etc/passwd parsing
Message-ID: <20150108131922.GM4190@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
References: <1063405400 DOT 20150105091246 AT yandex DOT ru>
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On Jan  5 09:12, Andrey Repin wrote:
> Greetings, All!
>=20
> Replace line 79 with
>=20
>   pwdhome=3D$(getent passwd ${uid} | cut -sd : -f 6 )
>=20
> The error messages in the next few lines should probably be updated as we=
ll.
> Something along the lines of
>=20
> 83:      "Unable to determine user's home directory from system settings.=
" \
>=20
> 90:      "${pwdhome} is found to be set as your home directory" \
>=20
> 99:    csih_warning "Your home directory is found to be set to root (/). =
This is not recommended!"

Just as I outlined in my other mail a few minutes ago, ssh-user-config
in the OpenSSH release package is not the latest upstream version.  If
you want to test the latest ssh-user-config script with 1.7.34-awareness,
see the attached.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

--e8/wErwm0bqugfcz
Content-Type: text/plain; charset=utf-8
Content-Disposition: attachment; filename=ssh-user-config
Content-Transfer-Encoding: quoted-printable

#!/bin/bash
#
# ssh-user-config, Copyright 2000-2014 Red Hat Inc.
#
# This file is part of the Cygwin port of OpenSSH.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS=
=20=20
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.=20=
=20=20
# IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,=20=
=20=20
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR=20=
=20=20=20
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR=20=
=20=20=20
# THE USE OR OTHER DEALINGS IN THE SOFTWARE.=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Initialization
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
PROGNAME=3D$(basename -- $0)
_tdir=3D$(dirname -- $0)
PROGDIR=3D$(cd $_tdir && pwd)

CSIH_SCRIPT=3D/usr/share/csih/cygwin-service-installation-helper.sh

# Subdirectory where the new package is being installed
PREFIX=3D/usr

# Directory where the config files are stored
SYSCONFDIR=3D/etc

source ${CSIH_SCRIPT}

auto_passphrase=3D"no"
passphrase=3D""
pwdhome=3D
with_passphrase=3D

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Routine: create_identity
#   optionally create identity of type argument in ~/.ssh
#   optionally add result to ~/.ssh/authorized_keys
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
create_identity() {
  local file=3D"$1"
  local type=3D"$2"
  local name=3D"$3"
  if [ ! -f "${pwdhome}/.ssh/${file}" ]
  then
    if csih_request "Shall I create a ${name} identity file for you?"
    then
      csih_inform "Generating ${pwdhome}/.ssh/${file}"
      if [ "${with_passphrase}" =3D "yes" ]
      then
        ssh-keygen -t "${type}" -N "${passphrase}" -f "${pwdhome}/.ssh/${fi=
le}" > /dev/null
      else
        ssh-keygen -t "${type}" -f "${pwdhome}/.ssh/${file}" > /dev/null
      fi
      if csih_request "Do you want to use this identity to login to this ma=
chine?"
      then
        csih_inform "Adding to ${pwdhome}/.ssh/authorized_keys"
        cat "${pwdhome}/.ssh/${file}.pub" >> "${pwdhome}/.ssh/authorized_ke=
ys"
      fi
    fi
  fi
} # =3D=3D=3D End of create_ssh1_identity() =3D=3D=3D #
readonly -f create_identity

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Routine: check_user_homedir
#   Perform various checks on the user's home directory
# SETS GLOBAL VARIABLE:
#   pwdhome
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
check_user_homedir() {
  pwdhome=3D$(getent passwd $UID | awk -F: '{ print $6; }')
  if [ "X${pwdhome}" =3D "X" ]
  then
    csih_error_multi \
      "There is no home directory set for you in the account database." \
      'Setting $HOME is not sufficient!'
  fi
=20=20
  if [ ! -d "${pwdhome}" ]
  then
    csih_error_multi \
      "${pwdhome} is set in the account database as your home directory" \
      'but it is not a valid directory. Cannot create user identity files.'
  fi
=20=20
  # If home is the root dir, set home to empty string to avoid error messag=
es
  # in subsequent parts of that script.
  if [ "X${pwdhome}" =3D "X/" ]
  then
    # But first raise a warning!
    csih_warning "Your home directory in the account database is set to roo=
t (/). This is not recommended!"
    if csih_request "Would you like to proceed anyway?"
    then
      pwdhome=3D''
    else
      csih_warning "Exiting. Configuration is not complete"
      exit 1
    fi
  fi
=20=20
  if [ -d "${pwdhome}" -a -n "`chmod -c g-w,o-w "${pwdhome}"`" ]
  then
    echo
    csih_warning 'group and other have been revoked write permission to you=
r home'
    csih_warning "directory ${pwdhome}."
    csih_warning 'This is required by OpenSSH to allow public key authentic=
ation using'
    csih_warning 'the key files stored in your .ssh subdirectory.'
    csih_warning 'Revert this change ONLY if you know what you are doing!'
    echo
  fi
} # =3D=3D=3D End of check_user_homedir() =3D=3D=3D #
readonly -f check_user_homedir

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Routine: check_user_dot_ssh_dir
#   Perform various checks on the ~/.ssh directory
# PREREQUISITE:
#   pwdhome -- check_user_homedir()
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
check_user_dot_ssh_dir() {
  if [ -e "${pwdhome}/.ssh" -a ! -d "${pwdhome}/.ssh" ]
  then
    csih_error "${pwdhome}/.ssh is existant but not a directory. Cannot cre=
ate user identity files."
  fi
=20=20
  if [ ! -e "${pwdhome}/.ssh" ]
  then
    mkdir "${pwdhome}/.ssh"
    if [ ! -e "${pwdhome}/.ssh" ]
    then
      csih_error "Creating users ${pwdhome}/.ssh directory failed"
    fi
  fi
} # =3D=3D=3D End of check_user_dot_ssh_dir() =3D=3D=3D #
readonly -f check_user_dot_ssh_dir

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Routine: fix_authorized_keys_perms
#   Corrects the permissions of ~/.ssh/authorized_keys
# PREREQUISITE:
#   pwdhome   -- check_user_homedir()
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
fix_authorized_keys_perms() {
  if [ -e "${pwdhome}/.ssh/authorized_keys" ]
  then
    setfacl -b "${pwdhome}/.ssh/authorized_keys" 2>/dev/null || echo -n
    if ! chmod u-x,g-wx,o-wx "${pwdhome}/.ssh/authorized_keys"
    then
      csih_warning "Setting correct permissions to ${pwdhome}/.ssh/authoriz=
ed_keys"
      csih_warning "failed.  Please care for the correct permissions.  The =
minimum requirement"
      csih_warning "is, the owner needs read permissions."
      echo
    fi
  fi
} # =3D=3D=3D End of fix_authorized_keys_perms() =3D=3D=3D #
readonly -f fix_authorized_keys_perms


# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Main Entry Point
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

# Check how the script has been started.  If
#   (1) it has been started by giving the full path and
#       that path is /etc/postinstall, OR
#   (2) Otherwise, if the environment variable
#       SSH_USER_CONFIG_AUTO_ANSWER_NO is set
# then set auto_answer to "no".  This allows automatic
# creation of the config files in /etc w/o overwriting
# them if they already exist.  In both cases, color
# escape sequences are suppressed, so as to prevent
# cluttering setup's logfiles.
if [ "$PROGDIR" =3D "/etc/postinstall" ]
then
  csih_auto_answer=3D"no"
  csih_disable_color
fi
if [ -n "${SSH_USER_CONFIG_AUTO_ANSWER_NO}" ]
then
  csih_auto_answer=3D"no"
  csih_disable_color
fi

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Parse options
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
while :
do
  case $# in
  0)
    break
    ;;
  esac

  option=3D$1
  shift

  case "$option" in
  -d | --debug )
    set -x
    csih_trace_on
    ;;

  -y | --yes )
    csih_auto_answer=3Dyes
    ;;

  -n | --no )
    csih_auto_answer=3Dno
    ;;

  -p | --passphrase )
    with_passphrase=3D"yes"
    passphrase=3D$1
    shift
    ;;

  *)
    echo "usage: ${PROGNAME} [OPTION]..."
    echo
    echo "This script creates an OpenSSH user configuration."
    echo
    echo "Options:"
    echo "    --debug      -d        Enable shell's debug output."
    echo "    --yes        -y        Answer all questions with \"yes\" auto=
matically."
    echo "    --no         -n        Answer all questions with \"no\" autom=
atically."
    echo "    --passphrase -p word   Use \"word\" as passphrase automatical=
ly."
    echo
    exit 1
    ;;

  esac
done

# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# Action!
# =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

check_user_homedir
check_user_dot_ssh_dir
create_identity id_rsa rsa "SSH2 RSA"
create_identity id_dsa dsa "SSH2 DSA"
create_identity id_ecdsa ecdsa "SSH2 ECDSA"
create_identity identity rsa1 "(deprecated) SSH1 RSA"
fix_authorized_keys_perms

echo
csih_inform "Configuration finished. Have fun!"



--e8/wErwm0bqugfcz--

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