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258 lines
8.0 KiB
Bash
258 lines
8.0 KiB
Bash
#!/bin/bash
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#
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# ssh-user-config, Copyright 2000-2014 Red Hat Inc.
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#
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# This file is part of the Cygwin port of OpenSSH.
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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# THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# ======================================================================
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# Initialization
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# ======================================================================
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PROGNAME=$(basename -- $0)
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_tdir=$(dirname -- $0)
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PROGDIR=$(cd $_tdir && pwd)
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CSIH_SCRIPT=/usr/share/csih/cygwin-service-installation-helper.sh
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# Subdirectory where the new package is being installed
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PREFIX=/usr
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# Directory where the config files are stored
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SYSCONFDIR=/etc
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source ${CSIH_SCRIPT}
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auto_passphrase="no"
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passphrase=""
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pwdhome=
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with_passphrase=
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# ======================================================================
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# Routine: create_identity
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# optionally create identity of type argument in ~/.ssh
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# optionally add result to ~/.ssh/authorized_keys
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# ======================================================================
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create_identity() {
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local file="$1"
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local type="$2"
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local name="$3"
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if [ ! -f "${pwdhome}/.ssh/${file}" ]
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then
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if csih_request "Shall I create a ${name} identity file for you?"
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then
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csih_inform "Generating ${pwdhome}/.ssh/${file}"
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if [ "${with_passphrase}" = "yes" ]
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then
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ssh-keygen -t "${type}" -N "${passphrase}" -f "${pwdhome}/.ssh/${file}" > /dev/null
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else
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ssh-keygen -t "${type}" -f "${pwdhome}/.ssh/${file}" > /dev/null
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fi
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if csih_request "Do you want to use this identity to login to this machine?"
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then
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csih_inform "Adding to ${pwdhome}/.ssh/authorized_keys"
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cat "${pwdhome}/.ssh/${file}.pub" >> "${pwdhome}/.ssh/authorized_keys"
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fi
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fi
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fi
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} # === End of create_ssh1_identity() === #
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readonly -f create_identity
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# ======================================================================
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# Routine: check_user_homedir
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# Perform various checks on the user's home directory
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# SETS GLOBAL VARIABLE:
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# pwdhome
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# ======================================================================
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check_user_homedir() {
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pwdhome=$(getent passwd $UID | awk -F: '{ print $6; }')
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if [ "X${pwdhome}" = "X" ]
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then
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csih_error_multi \
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"There is no home directory set for you in the account database." \
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'Setting $HOME is not sufficient!'
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fi
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if [ ! -d "${pwdhome}" ]
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then
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csih_error_multi \
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"${pwdhome} is set in the account database as your home directory" \
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'but it is not a valid directory. Cannot create user identity files.'
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fi
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# If home is the root dir, set home to empty string to avoid error messages
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# in subsequent parts of that script.
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if [ "X${pwdhome}" = "X/" ]
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then
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# But first raise a warning!
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csih_warning "Your home directory in the account database is set to root (/). This is not recommended!"
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if csih_request "Would you like to proceed anyway?"
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then
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pwdhome=''
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else
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csih_warning "Exiting. Configuration is not complete"
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exit 1
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fi
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fi
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if [ -d "${pwdhome}" -a -n "`chmod -c g-w,o-w "${pwdhome}"`" ]
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then
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echo
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csih_warning 'group and other have been revoked write permission to your home'
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csih_warning "directory ${pwdhome}."
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csih_warning 'This is required by OpenSSH to allow public key authentication using'
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csih_warning 'the key files stored in your .ssh subdirectory.'
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csih_warning 'Revert this change ONLY if you know what you are doing!'
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echo
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fi
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} # === End of check_user_homedir() === #
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readonly -f check_user_homedir
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# ======================================================================
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# Routine: check_user_dot_ssh_dir
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# Perform various checks on the ~/.ssh directory
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# PREREQUISITE:
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# pwdhome -- check_user_homedir()
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# ======================================================================
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check_user_dot_ssh_dir() {
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if [ -e "${pwdhome}/.ssh" -a ! -d "${pwdhome}/.ssh" ]
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then
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csih_error "${pwdhome}/.ssh is existent but not a directory. Cannot create user identity files."
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fi
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if [ ! -e "${pwdhome}/.ssh" ]
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then
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mkdir "${pwdhome}/.ssh"
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if [ ! -e "${pwdhome}/.ssh" ]
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then
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csih_error "Creating users ${pwdhome}/.ssh directory failed"
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fi
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fi
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} # === End of check_user_dot_ssh_dir() === #
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readonly -f check_user_dot_ssh_dir
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# ======================================================================
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# Routine: fix_authorized_keys_perms
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# Corrects the permissions of ~/.ssh/authorized_keys
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# PREREQUISITE:
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# pwdhome -- check_user_homedir()
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# ======================================================================
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fix_authorized_keys_perms() {
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if [ -e "${pwdhome}/.ssh/authorized_keys" ]
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then
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setfacl -b "${pwdhome}/.ssh/authorized_keys" 2>/dev/null || echo -n
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if ! chmod u-x,g-wx,o-wx "${pwdhome}/.ssh/authorized_keys"
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then
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csih_warning "Setting correct permissions to ${pwdhome}/.ssh/authorized_keys"
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csih_warning "failed. Please care for the correct permissions. The minimum requirement"
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csih_warning "is, the owner needs read permissions."
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echo
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fi
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fi
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} # === End of fix_authorized_keys_perms() === #
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readonly -f fix_authorized_keys_perms
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# ======================================================================
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# Main Entry Point
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# ======================================================================
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# Check how the script has been started. If
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# (1) it has been started by giving the full path and
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# that path is /etc/postinstall, OR
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# (2) Otherwise, if the environment variable
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# SSH_USER_CONFIG_AUTO_ANSWER_NO is set
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# then set auto_answer to "no". This allows automatic
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# creation of the config files in /etc w/o overwriting
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# them if they already exist. In both cases, color
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# escape sequences are suppressed, so as to prevent
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# cluttering setup's logfiles.
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if [ "$PROGDIR" = "/etc/postinstall" ]
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then
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csih_auto_answer="no"
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csih_disable_color
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fi
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if [ -n "${SSH_USER_CONFIG_AUTO_ANSWER_NO}" ]
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then
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csih_auto_answer="no"
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csih_disable_color
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fi
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# ======================================================================
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# Parse options
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# ======================================================================
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while :
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do
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case $# in
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0)
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break
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;;
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esac
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option=$1
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shift
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case "$option" in
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-d | --debug )
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set -x
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csih_trace_on
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;;
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-y | --yes )
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csih_auto_answer=yes
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;;
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-n | --no )
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csih_auto_answer=no
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;;
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-p | --passphrase )
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with_passphrase="yes"
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passphrase=$1
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shift
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;;
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*)
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echo "usage: ${PROGNAME} [OPTION]..."
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echo
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echo "This script creates an OpenSSH user configuration."
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echo
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echo "Options:"
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echo " --debug -d Enable shell's debug output."
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echo " --yes -y Answer all questions with \"yes\" automatically."
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echo " --no -n Answer all questions with \"no\" automatically."
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echo " --passphrase -p word Use \"word\" as passphrase automatically."
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echo
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exit 1
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;;
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esac
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done
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# ======================================================================
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# Action!
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# ======================================================================
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check_user_homedir
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check_user_dot_ssh_dir
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create_identity id_rsa rsa "SSH2 RSA"
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create_identity id_dsa dsa "SSH2 DSA"
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create_identity id_ecdsa ecdsa "SSH2 ECDSA"
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create_identity identity rsa1 "(deprecated) SSH1 RSA"
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fix_authorized_keys_perms
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echo
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csih_inform "Configuration finished. Have fun!"
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