#!/bin/bash
#
# ssh-host-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
# ======================================================================
CSIH_SCRIPT=/usr/share/csih/cygwin-service-installation-helper.sh
# List of apps used. This is checkad for existance in csih_sanity_check
# Don't use *any* transient commands before sourcing the csih helper script,
# otherwise the sanity checks are short-circuited.
declare -a csih_required_commands=(
/usr/bin/basename coreutils
/usr/bin/cat coreutils
/usr/bin/chmod coreutils
/usr/bin/dirname coreutils
/usr/bin/id coreutils
/usr/bin/mv coreutils
/usr/bin/rm coreutils
/usr/bin/cygpath cygwin
/usr/bin/mkpasswd cygwin
/usr/bin/mount cygwin
/usr/bin/ps cygwin
/usr/bin/umount cygwin
/usr/bin/cmp diffutils
/usr/bin/grep grep
/usr/bin/awk gawk
/usr/bin/ssh-keygen openssh
/usr/sbin/sshd openssh
/usr/bin/sed sed
)
csih_sanity_check_server=yes
source ${CSIH_SCRIPT}
PROGNAME=$(/usr/bin/basename $0)
_tdir=$(/usr/bin/dirname $0)
PROGDIR=$(cd $_tdir && pwd)
# Subdirectory where the new package is being installed
PREFIX=/usr
# Directory where the config files are stored
SYSCONFDIR=/etc
LOCALSTATEDIR=/var
sshd_config_configured=no
port_number=22
service_name=sshd
strictmodes=yes
cygwin_value=""
user_account=
password_value=
opt_force=no
# ======================================================================
# Routine: update_services_file
# ======================================================================
update_services_file() {
local _my_etcdir="/ssh-host-config.$$"
local _win_etcdir
local _services
local _spaces
local _serv_tmp
local _wservices
local ret=0
_win_etcdir="${SYSTEMROOT}\\system32\\drivers\\etc"
_services="${_my_etcdir}/services"
_spaces=" #"
_serv_tmp="${_my_etcdir}/srv.out.$$"
/usr/bin/mount -o text,posix=0,noacl -f "${_win_etcdir}" "${_my_etcdir}"
# Depends on the above mount
_wservices=`cygpath -w "${_services}"`
# Add ssh 22/tcp and ssh 22/udp to services
if [ `/usr/bin/grep -q 'ssh[[:space:]][[:space:]]*22' "${_services}"; echo $?` -ne 0 ]
then
if /usr/bin/awk '{ if ( $2 ~ /^23\/tcp/ ) print "ssh 22/tcp'"${_spaces}"'SSH Remote Login Protocol\nssh 22/udp'"${_spaces}"'SSH Remote Login Protocol"; print $0; }' < "${_services}" > "${_serv_tmp}"
then
if /usr/bin/mv "${_serv_tmp}" "${_services}"
then
csih_inform "Added ssh to ${_wservices}"
else
csih_warning "Adding ssh to ${_wservices} failed!"
let ++ret
fi
/usr/bin/rm -f "${_serv_tmp}"
else
csih_warning "Adding ssh to ${_wservices} failed!"
let ++ret
fi
fi
/usr/bin/umount "${_my_etcdir}"
return $ret
} # --- End of update_services_file --- #
# ======================================================================
# Routine: sshd_strictmodes
# MODIFIES: strictmodes
# ======================================================================
sshd_strictmodes() {
if [ "${sshd_config_configured}" != "yes" ]
then
echo
csih_inform "StrictModes is set to 'yes' by default."
csih_inform "This is the recommended setting, but it requires that the POSIX"
csih_inform "permissions of the user's home directory, the user's .ssh"
csih_inform "directory, and the user's ssh key files are tight so that"
csih_inform "only the user has write permissions."
csih_inform "On the other hand, StrictModes don't work well with default"
csih_inform "Windows permissions of a home directory mounted with the"
csih_inform "'noacl' option, and they don't work at all if the home"
csih_inform "directory is on a FAT or FAT32 partition."
if ! csih_request "Should StrictModes be used?"
then
strictmodes=no
fi
fi
return 0
}
# ======================================================================
# Routine: sshd_privsep
# Try to create ssshd user account
# ======================================================================
sshd_privsep() {
local ret=0
if [ "${sshd_config_configured}" != "yes" ]
then
if ! csih_create_unprivileged_user sshd
then
csih_error_recoverable "Could not create user 'sshd'!"
csih_error_recoverable "You will not be able to run an sshd service"
csih_error_recoverable "under a privileged account successfully."
csih_error_recoverable "Make sure to create a non-privileged user 'sshd'"
csih_error_recoverable "manually before trying to run the service!"
let ++ret
fi
fi
return $ret
} # --- End of sshd_privsep --- #
# ======================================================================
# Routine: sshd_config_tweak
# ======================================================================
sshd_config_tweak() {
local ret=0
# Modify sshd_config
csih_inform "Updating ${SYSCONFDIR}/sshd_config file"
if [ "${port_number}" -ne 22 ]
then
/usr/bin/sed -i -e "s/^#\?[[:space:]]*Port[[:space:]].*/Port ${port_number}/" \
${SYSCONFDIR}/sshd_config
if [ $? -ne 0 ]
then
csih_warning "Setting listening port to ${port_number} failed!"
csih_warning "Check your ${SYSCONFDIR}/sshd_config file!"
let ++ret
fi
fi
if [ "${strictmodes}" = "no" ]
then
/usr/bin/sed -i -e "s/^#\?[[:space:]]*StrictModes[[:space:]].*/StrictModes no/" \
${SYSCONFDIR}/sshd_config
if [ $? -ne 0 ]
then
csih_warning "Setting StrictModes to 'no' failed!"
csih_warning "Check your ${SYSCONFDIR}/sshd_config file!"
let ++ret
fi
fi
return $ret
} # --- End of sshd_config_tweak --- #
# ======================================================================
# Routine: update_inetd_conf
# ======================================================================
update_inetd_conf() {
local _inetcnf="${SYSCONFDIR}/inetd.conf"
local _inetcnf_tmp="${SYSCONFDIR}/inetd.conf.$$"
local _inetcnf_dir="${SYSCONFDIR}/inetd.d"
local _sshd_inetd_conf="${_inetcnf_dir}/sshd-inetd"
local _sshd_inetd_conf_tmp="${_inetcnf_dir}/sshd-inetd.$$"
local _with_comment=1
local ret=0
if [ -d "${_inetcnf_dir}" ]
then
# we have inetutils-1.5 inetd.d support
if [ -f "${_inetcnf}" ]
then
/usr/bin/grep -q '^[[:space:]]*ssh' "${_inetcnf}" && _with_comment=0
# check for sshd OR ssh in top-level inetd.conf file, and remove
# will be replaced by a file in inetd.d/
if [ $(/usr/bin/grep -q '^[# \t]*ssh' "${_inetcnf}"; echo $?) -eq 0 ]
then
/usr/bin/grep -v '^[# \t]*ssh' "${_inetcnf}" >> "${_inetcnf_tmp}"
if [ -f "${_inetcnf_tmp}" ]
then
if /usr/bin/mv "${_inetcnf_tmp}" "${_inetcnf}"
then
csih_inform "Removed ssh[d] from ${_inetcnf}"
else
csih_warning "Removing ssh[d] from ${_inetcnf} failed!"
let ++ret
fi
/usr/bin/rm -f "${_inetcnf_tmp}"
else
csih_warning "Removing ssh[d] from ${_inetcnf} failed!"
let ++ret
fi
fi
fi
csih_install_config "${_sshd_inetd_conf}" "${SYSCONFDIR}/defaults"
if /usr/bin/cmp "${SYSCONFDIR}/defaults${_sshd_inetd_conf}" "${_sshd_inetd_conf}" >/dev/null 2>&1
then
if [ "${_with_comment}" -eq 0 ]
then
/usr/bin/sed -e 's/@COMMENT@[[:space:]]*//' < "${_sshd_inetd_conf}" > "${_sshd_inetd_conf_tmp}"
else
/usr/bin/sed -e 's/@COMMENT@[[:space:]]*/# /' < "${_sshd_inetd_conf}" > "${_sshd_inetd_conf_tmp}"
fi
if /usr/bin/mv "${_sshd_inetd_conf_tmp}" "${_sshd_inetd_conf}"
then
csih_inform "Updated ${_sshd_inetd_conf}"
else
csih_warning "Updating ${_sshd_inetd_conf} failed!"
let ++ret
fi
fi
elif [ -f "${_inetcnf}" ]
then
/usr/bin/grep -q '^[[:space:]]*sshd' "${_inetcnf}" && _with_comment=0
# check for sshd in top-level inetd.conf file, and remove
# will be replaced by a file in inetd.d/
if [ `/usr/bin/grep -q '^#\?[[:space:]]*sshd' "${_inetcnf}"; echo $?` -eq 0 ]
then
/usr/bin/grep -v '^#\?[[:space:]]*sshd' "${_inetcnf}" >> "${_inetcnf_tmp}"
if [ -f "${_inetcnf_tmp}" ]
then
if /usr/bin/mv "${_inetcnf_tmp}" "${_inetcnf}"
then
csih_inform "Removed sshd from ${_inetcnf}"
else
csih_warning "Removing sshd from ${_inetcnf} failed!"
let ++ret
fi
/usr/bin/rm -f "${_inetcnf_tmp}"
else
csih_warning "Removing sshd from ${_inetcnf} failed!"
let ++ret
fi
fi
# Add ssh line to inetd.conf
if [ `/usr/bin/grep -q '^[# \t]*ssh' "${_inetcnf}"; echo $?` -ne 0 ]
then
if [ "${_with_comment}" -eq 0 ]
then
echo 'ssh stream tcp nowait root /usr/sbin/sshd sshd -i' >> "${_inetcnf}"
else
echo '# ssh stream tcp nowait root /usr/sbin/sshd sshd -i' >> "${_inetcnf}"
fi
if [ $? -eq 0 ]
then
csih_inform "Added ssh to ${_inetcnf}"
else
csih_warning "Adding ssh to ${_inetcnf} failed!"
let ++ret
fi
fi
fi
return $ret
} # --- End of update_inetd_conf --- #
# ======================================================================
# Routine: check_service_files_ownership
# Checks that the files in /etc and /var belong to the right owner
# ======================================================================
check_service_files_ownership() {
local run_service_as=$1
local ret=0
if [ -z "${run_service_as}" ]
then
accnt_name=$(/usr/bin/cygrunsrv -VQ sshd |
/usr/bin/sed -ne 's/^Account *: *//gp')
if [ "${accnt_name}" = "LocalSystem" ]
then
# Convert "LocalSystem" to "SYSTEM" as is the correct account name
run_service_as="SYSTEM"
else
dom="${accnt_name%%\\*}"
accnt_name="${accnt_name#*\\}"
if [ "${dom}" = '.' ]
then
# Check local account
run_service_as=$(/usr/bin/mkpasswd -l -u "${accnt_name}" |
/usr/bin/awk -F: '{print $1;}')
else
# Check domain
run_service_as=$(/usr/bin/mkpasswd -d "${dom}" -u "${accnt_name}" |
/usr/bin/awk -F: '{print $1;}')
fi
fi
if [ -z "${run_service_as}" ]
then
csih_warning "Couldn't determine name of user running sshd service from account database!"
csih_warning "As a result, this script cannot make sure that the files used"
csih_warning "by the sshd service belong to the user running the service."
return 1
fi
fi
for i in "${SYSCONFDIR}"/ssh_config "${SYSCONFDIR}"/sshd_config "${SYSCONFDIR}"/ssh_host_*key "${SYSCONFDIR}"/ssh_host_*key.pub
do
if [ -f "$i" ]
then
if ! chown "${run_service_as}".544 "$i" >/dev/null 2>&1
then
csih_warning "Couldn't change owner of $i!"
let ++ret
fi
fi
done
if ! chown "${run_service_as}".544 ${LOCALSTATEDIR}/empty >/dev/null 2>&1
then
csih_warning "Couldn't change owner of ${LOCALSTATEDIR}/empty!"
let ++ret
fi
if ! chown "${run_service_as}".544 ${LOCALSTATEDIR}/log/lastlog >/dev/null 2>&1
then
csih_warning "Couldn't change owner of ${LOCALSTATEDIR}/log/lastlog!"
let ++ret
fi
if [ -f ${LOCALSTATEDIR}/log/sshd.log ]
then
if ! chown "${run_service_as}".544 ${LOCALSTATEDIR}/log/sshd.log >/dev/null 2>&1
then
csih_warning "Couldn't change owner of ${LOCALSTATEDIR}/log/sshd.log!"
let ++ret
fi
fi
if [ $ret -ne 0 ]
then
csih_warning "Couldn't change owner of important files to ${run_service_as}!"
csih_warning "This may cause the sshd service to fail! Please make sure that"
csih_warning "you have suufficient permissions to change the ownership of files"
csih_warning "and try to run the ssh-host-config script again."
fi
return $ret
} # --- End of check_service_files_ownership --- #
# ======================================================================
# Routine: install_service
# Install sshd as a service
# ======================================================================
install_service() {
local run_service_as
local password
local ret=0
echo
if /usr/bin/cygrunsrv -Q ${service_name} >/dev/null 2>&1
then
csih_inform "Sshd service is already installed."
check_service_files_ownership "" || let ret+=$?
else
echo -e "${_csih_QUERY_STR} Do you want to install sshd as a service?"
if csih_request "(Say \"no\" if it is already installed as a service)"
then
csih_get_cygenv "${cygwin_value}"
if ( csih_is_nt2003 || [ "$csih_FORCE_PRIVILEGED_USER" = "yes" ] )
then
csih_inform "On Windows Server 2003, Windows Vista, and above, the"
csih_inform "SYSTEM account cannot setuid to other users -- a capability"
csih_inform "sshd requires. You need to have or to create a privileged"
csih_inform "account. This script will help you do so."
echo
[ "${opt_force}" = "yes" ] && opt_f=-f
[ -n "${user_account}" ] && opt_u="-u ""${user_account}"""
csih_select_privileged_username ${opt_f} ${opt_u} sshd
if ! csih_create_privileged_user "${password_value}"
then
csih_error_recoverable "There was a serious problem creating a privileged user."
csih_request "Do you want to proceed anyway?" || exit 1
let ++ret
fi
fi
# Never returns empty if NT or above
run_service_as=$(csih_service_should_run_as)
if [ "${run_service_as}" = "${csih_PRIVILEGED_USERNAME}" ]
then
password="${csih_PRIVILEGED_PASSWORD}"
if [ -z "${password}" ]
then
csih_get_value "Please enter the password for user '${run_service_as}':" "-s"
password="${csih_value}"
fi
fi
# At this point, we either have $run_service_as = "system" and
# $password is empty, or $run_service_as is some privileged user and
# (hopefully) $password contains the correct password. So, from here
# out, we use '-z "${password}"' to discriminate the two cases.
csih_check_user "${run_service_as}"
if [ -n "${csih_cygenv}" ]
then
cygwin_env=( -e "CYGWIN=${csih_cygenv}" )
fi
if [ -z "${password}" ]
then
if /usr/bin/cygrunsrv -I ${service_name} -d "CYGWIN ${service_name}" -p /usr/sbin/sshd \
-a "-D" -y tcpip "${cygwin_env[@]}"
then
echo
csih_inform "The sshd service has been installed under the LocalSystem"
csih_inform "account (also known as SYSTEM). To start the service now, call"
csih_inform "\`net start sshd' or \`cygrunsrv -S sshd'. Otherwise, it"
csih_inform "will start automatically after the next reboot."
fi
else
if /usr/bin/cygrunsrv -I ${service_name} -d "CYGWIN ${service_name}" -p /usr/sbin/sshd \
-a "-D" -y tcpip "${cygwin_env[@]}" \
-u "${run_service_as}" -w "${password}"
then
/usr/bin/editrights -u "${run_service_as}" -a SeServiceLogonRight
echo
csih_inform "The sshd service has been installed under the '${run_service_as}'"
csih_inform "account. To start the service now, call \`net start ${service_name}' or"
csih_inform "\`cygrunsrv -S ${service_name}'. Otherwise, it will start automatically"
csih_inform "after the next reboot."
fi
fi
if /usr/bin/cygrunsrv -Q ${service_name} >/dev/null 2>&1
then
check_service_files_ownership "${run_service_as}" || let ret+=$?
else
csih_error_recoverable "Installing sshd as a service failed!"
let ++ret
fi
fi # user allowed us to install as service
fi # service not yet installed
return $ret
} # --- End of install_service --- #
# ======================================================================
# Main Entry Point
# ======================================================================
# Check how the script has been started. If
# (1) it has been started by giving the full path and
# that path is /etc/postinstall, OR
# (2) Otherwise, if the environment variable
# SSH_HOST_CONFIG_AUTO_ANSWER_NO is set
# then set auto_answer to "no". This allows automatic
# creation of the config files in /etc w/o overwriting
# them if they already exist. In both cases, color
# escape sequences are suppressed, so as to prevent
# cluttering setup's logfiles.
if [ "$PROGDIR" = "/etc/postinstall" ]
then
csih_auto_answer="no"
csih_disable_color
opt_force=yes
fi
if [ -n "${SSH_HOST_CONFIG_AUTO_ANSWER_NO}" ]
then
csih_auto_answer="no"
csih_disable_color
opt_force=yes
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
opt_force=yes
;;
-n | --no )
csih_auto_answer=no
opt_force=yes
;;
-c | --cygwin )
cygwin_value="$1"
shift
;;
-N | --name )
service_name=$1
shift
;;
-p | --port )
port_number=$1
shift
;;
-u | --user )
user_account="$1"
shift
;;
-w | --pwd )
password_value="$1"
shift
;;
--privileged )
csih_FORCE_PRIVILEGED_USER=yes
;;
*)
echo "usage: ${progname} [OPTION]..."
echo
echo "This script creates an OpenSSH host configuration."
echo
echo "Options:"
echo " --debug -d Enable shell's debug output."
echo " --yes -y Answer all questions with \"yes\" automatically."
echo " --no -n Answer all questions with \"no\" automatically."
echo " --cygwin -c <options> Use \"options\" as value for CYGWIN environment var."
echo " --name -N <name> sshd windows service name."
echo " --port -p <n> sshd listens on port n."
echo " --user -u <account> privileged user for service, default 'cyg_server'."
echo " --pwd -w <passwd> Use \"pwd\" as password for privileged user."
echo " --privileged On Windows XP, require privileged user"
echo " instead of LocalSystem for sshd service."
echo
exit 1
;;
esac
done
# ======================================================================
# Action!
# ======================================================================
# Check for running ssh/sshd processes first. Refuse to do anything while
# some ssh processes are still running
if /usr/bin/ps -ef | /usr/bin/grep -q '/sshd\?$'
then
echo
csih_error "There are still ssh processes running. Please shut them down first."
fi
# Make sure the user is running in an administrative context
admin=$(/usr/bin/id -G | /usr/bin/grep -Eq '\<544\>' && echo yes || echo no)
if [ "${admin}" != "yes" ]
then
echo
csih_warning "Running this script typically requires administrator privileges!"
csih_warning "However, it seems your account does not have these privileges."
csih_warning "Here's the list of groups in your user token:"
echo
/usr/bin/id -Gnz | xargs -0n1 echo " "
echo
csih_warning "This usually means you're running this script from a non-admin"
csih_warning "desktop session, or in a non-elevated shell under UAC control."
echo
csih_warning "Make sure you have the appropriate privileges right now,"
csih_warning "otherwise parts of this script will probably fail!"
echo
echo -e "${_csih_QUERY_STR} Are you sure you want to continue? (Say \"no\" if you're not sure"
if ! csih_request "you have the required privileges)"
then
echo
csih_inform "Ok. Exiting. Make sure to switch to an administrative account"
csih_inform "or to start this script from an elevated shell."
exit 1
fi
fi
echo
warning_cnt=0
# Create /var/log/lastlog if not already exists
if [ -e ${LOCALSTATEDIR}/log/lastlog -a ! -f ${LOCALSTATEDIR}/log/lastlog ]
then
echo
csih_error_multi "${LOCALSTATEDIR}/log/lastlog exists, but is not a file." \
"Cannot create ssh host configuration."
fi
if [ ! -e ${LOCALSTATEDIR}/log/lastlog ]
then
/usr/bin/cat /dev/null > ${LOCALSTATEDIR}/log/lastlog
if ! /usr/bin/chmod 644 ${LOCALSTATEDIR}/log/lastlog >/dev/null 2>&1
then
csih_warning "Can't set permissions on ${LOCALSTATEDIR}/log/lastlog!"
let ++warning_cnt
fi
fi
# Create /var/empty file used as chroot jail for privilege separation
csih_make_dir "${LOCALSTATEDIR}/empty" "Cannot create ${LOCALSTATEDIR}/empty directory."
if ! /usr/bin/chmod 755 "${LOCALSTATEDIR}/empty" >/dev/null 2>&1
then
csih_warning "Can't set permissions on ${LOCALSTATEDIR}/empty!"
let ++warning_cnt
fi
# generate missing host keys
csih_inform "Generating missing SSH host keys"
/usr/bin/ssh-keygen -A || let warning_cnt+=$?
# handle ssh_config
csih_install_config "${SYSCONFDIR}/ssh_config" "${SYSCONFDIR}/defaults" || let ++warning_cnt
if /usr/bin/cmp "${SYSCONFDIR}/ssh_config" "${SYSCONFDIR}/defaults/${SYSCONFDIR}/ssh_config" >/dev/null 2>&1
then
if [ "${port_number}" != "22" ]
then
csih_inform "Updating ${SYSCONFDIR}/ssh_config file with requested port"
echo "Host localhost" >> ${SYSCONFDIR}/ssh_config
echo " Port ${port_number}" >> ${SYSCONFDIR}/ssh_config
fi
fi
# handle sshd_config
csih_install_config "${SYSCONFDIR}/sshd_config" "${SYSCONFDIR}/defaults" || let ++warning_cnt
if ! /usr/bin/cmp "${SYSCONFDIR}/sshd_config" "${SYSCONFDIR}/defaults/${SYSCONFDIR}/sshd_config" >/dev/null 2>&1
then
sshd_config_configured=yes
fi
sshd_strictmodes || let warning_cnt+=$?
sshd_privsep || let warning_cnt+=$?
sshd_config_tweak || let warning_cnt+=$?
update_services_file || let warning_cnt+=$?
update_inetd_conf || let warning_cnt+=$?
install_service || let warning_cnt+=$?
echo
if [ $warning_cnt -eq 0 ]
then
csih_inform "Host configuration finished. Have fun!"
else
csih_warning "Host configuration exited with ${warning_cnt} errors or warnings!"
csih_warning "Make sure that all problems reported are fixed,"
csih_warning "then re-run ssh-host-config."
fi
exit $warning_cnt