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|
#!/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
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
# THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# ======================================================================
# Initialization
# ======================================================================
PROGNAME=$(basename -- $0)
_tdir=$(dirname -- $0)
PROGDIR=$(cd $_tdir && pwd)
CSIH_SCRIPT=/usr/share/csih/cygwin-service-installation-helper.sh
# Subdirectory where the new package is being installed
PREFIX=/usr
# Directory where the config files are stored
SYSCONFDIR=/etc
source ${CSIH_SCRIPT}
auto_passphrase="no"
passphrase=""
pwdhome=
with_passphrase=
# ======================================================================
# Routine: create_identity
# optionally create identity of type argument in ~/.ssh
# optionally add result to ~/.ssh/authorized_keys
# ======================================================================
create_identity() {
local file="$1"
local type="$2"
local name="$3"
if [ ! -f "${pwdhome}/.ssh/${file}" ]
then
if csih_request "Shall I create a ${name} identity file for you?"
then
csih_inform "Generating ${pwdhome}/.ssh/${file}"
if [ "${with_passphrase}" = "yes" ]
then
ssh-keygen -t "${type}" -N "${passphrase}" -f "${pwdhome}/.ssh/${file}" > /dev/null
else
ssh-keygen -t "${type}" -f "${pwdhome}/.ssh/${file}" > /dev/null
fi
if csih_request "Do you want to use this identity to login to this machine?"
then
csih_inform "Adding to ${pwdhome}/.ssh/authorized_keys"
cat "${pwdhome}/.ssh/${file}.pub" >> "${pwdhome}/.ssh/authorized_keys"
fi
fi
fi
} # === End of create_ssh1_identity() === #
readonly -f create_identity
# ======================================================================
# Routine: check_user_homedir
# Perform various checks on the user's home directory
# SETS GLOBAL VARIABLE:
# pwdhome
# ======================================================================
check_user_homedir() {
pwdhome=$(getent passwd $UID | awk -F: '{ print $6; }')
if [ "X${pwdhome}" = "X" ]
then
csih_error_multi \
"There is no home directory set for you in the account database." \
'Setting $HOME is not sufficient!'
fi
if [ ! -d "${pwdhome}" ]
then
csih_error_multi \
"${pwdhome} is set in the account database as your home directory" \
'but it is not a valid directory. Cannot create user identity files.'
fi
# If home is the root dir, set home to empty string to avoid error messages
# in subsequent parts of that script.
if [ "X${pwdhome}" = "X/" ]
then
# But first raise a warning!
csih_warning "Your home directory in the account database is set to root (/). This is not recommended!"
if csih_request "Would you like to proceed anyway?"
then
pwdhome=''
else
csih_warning "Exiting. Configuration is not complete"
exit 1
fi
fi
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 your home'
csih_warning "directory ${pwdhome}."
csih_warning 'This is required by OpenSSH to allow public key authentication using'
csih_warning 'the key files stored in your .ssh subdirectory.'
csih_warning 'Revert this change ONLY if you know what you are doing!'
echo
fi
} # === End of check_user_homedir() === #
readonly -f check_user_homedir
# ======================================================================
# Routine: check_user_dot_ssh_dir
# Perform various checks on the ~/.ssh directory
# PREREQUISITE:
# pwdhome -- check_user_homedir()
# ======================================================================
check_user_dot_ssh_dir() {
if [ -e "${pwdhome}/.ssh" -a ! -d "${pwdhome}/.ssh" ]
then
csih_error "${pwdhome}/.ssh is existent but not a directory. Cannot create user identity files."
fi
if [ ! -e "${pwdhome}/.ssh" ]
then
mkdir "${pwdhome}/.ssh"
if [ ! -e "${pwdhome}/.ssh" ]
then
csih_error "Creating users ${pwdhome}/.ssh directory failed"
fi
fi
} # === End of check_user_dot_ssh_dir() === #
readonly -f check_user_dot_ssh_dir
# ======================================================================
# Routine: fix_authorized_keys_perms
# Corrects the permissions of ~/.ssh/authorized_keys
# PREREQUISITE:
# pwdhome -- check_user_homedir()
# ======================================================================
fix_authorized_keys_perms() {
if [ -e "${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 ${pwdhome}/.ssh/authorized_keys"
csih_warning "failed. Please care for the correct permissions. The minimum requirement"
csih_warning "is, the owner needs read permissions."
echo
fi
fi
} # === End of fix_authorized_keys_perms() === #
readonly -f fix_authorized_keys_perms
# ======================================================================
# Main Entry Point
# ======================================================================
# Check how the script has been started. If
# (1) it has been started by giving the full path and
# that path is /etc/postinstall, OR
# (2) Otherwise, if the environment variable
# SSH_USER_CONFIG_AUTO_ANSWER_NO is set
# then set auto_answer to "no". This allows automatic
# creation of the config files in /etc w/o overwriting
# them if they already exist. In both cases, color
# escape sequences are suppressed, so as to prevent
# cluttering setup's logfiles.
if [ "$PROGDIR" = "/etc/postinstall" ]
then
csih_auto_answer="no"
csih_disable_color
fi
if [ -n "${SSH_USER_CONFIG_AUTO_ANSWER_NO}" ]
then
csih_auto_answer="no"
csih_disable_color
fi
# ======================================================================
# Parse options
# ======================================================================
while :
do
case $# in
0)
break
;;
esac
option=$1
shift
case "$option" in
-d | --debug )
set -x
csih_trace_on
;;
-y | --yes )
csih_auto_answer=yes
;;
-n | --no )
csih_auto_answer=no
;;
-p | --passphrase )
with_passphrase="yes"
passphrase=$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\" automatically."
echo " --no -n Answer all questions with \"no\" automatically."
echo " --passphrase -p word Use \"word\" as passphrase automatically."
echo
exit 1
;;
esac
done
# ======================================================================
# Action!
# ======================================================================
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!"
|
