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openssh/contrib/cygwin/ssh-host-config

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#!/bin/bash
#
# ssh-host-config, Copyright 2000-2009 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
LOCALSTATEDIR=/var
source ${CSIH_SCRIPT}
port_number=22
privsep_configured=no
privsep_used=yes
cygwin_value=""
user_account=
password_value=
opt_force=no
# ======================================================================
# Routine: create_host_keys
# ======================================================================
create_host_keys() {
if [ ! -f "${SYSCONFDIR}/ssh_host_key" ]
then
csih_inform "Generating ${SYSCONFDIR}/ssh_host_key"
ssh-keygen -t rsa1 -f ${SYSCONFDIR}/ssh_host_key -N '' > /dev/null
fi
if [ ! -f "${SYSCONFDIR}/ssh_host_rsa_key" ]
then
csih_inform "Generating ${SYSCONFDIR}/ssh_host_rsa_key"
ssh-keygen -t rsa -f ${SYSCONFDIR}/ssh_host_rsa_key -N '' > /dev/null
fi
if [ ! -f "${SYSCONFDIR}/ssh_host_dsa_key" ]
then
csih_inform "Generating ${SYSCONFDIR}/ssh_host_dsa_key"
ssh-keygen -t dsa -f ${SYSCONFDIR}/ssh_host_dsa_key -N '' > /dev/null
fi
} # --- End of create_host_keys --- #
# ======================================================================
# Routine: update_services_file
# ======================================================================
update_services_file() {
local _my_etcdir="/ssh-host-config.$$"
local _win_etcdir
local _services
local _spaces
local _serv_tmp
local _wservices
if csih_is_nt
then
_win_etcdir="${SYSTEMROOT}\\system32\\drivers\\etc"
_services="${_my_etcdir}/services"
# On NT, 27 spaces, no space after the hash
_spaces=" #"
else
_win_etcdir="${WINDIR}"
_services="${_my_etcdir}/SERVICES"
# On 9x, 18 spaces (95 is very touchy), a space after the hash
_spaces=" # "
fi
_serv_tmp="${_my_etcdir}/srv.out.$$"
mount -o text,posix=0,noacl -f "${_win_etcdir}" "${_my_etcdir}"
# Depends on the above mount
_wservices=`cygpath -w "${_services}"`
# Remove sshd 22/port from services
if [ `grep -q 'sshd[ \t][ \t]*22' "${_services}"; echo $?` -eq 0 ]
then
grep -v 'sshd[ \t][ \t]*22' "${_services}" > "${_serv_tmp}"
if [ -f "${_serv_tmp}" ]
then
if mv "${_serv_tmp}" "${_services}"
then
csih_inform "Removing sshd from ${_wservices}"
else
csih_warning "Removing sshd from ${_wservices} failed!"
fi
rm -f "${_serv_tmp}"
else
csih_warning "Removing sshd from ${_wservices} failed!"
fi
fi
# Add ssh 22/tcp and ssh 22/udp to services
if [ `grep -q 'ssh[ \t][ \t]*22' "${_services}"; echo $?` -ne 0 ]
then
if 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}" > "${_serv_tmp}"
then
if mv "${_serv_tmp}" "${_services}"
then
csih_inform "Added ssh to ${_wservices}"
else
csih_warning "Adding ssh to ${_wservices} failed!"
fi
rm -f "${_serv_tmp}"
else
csih_warning "Adding ssh to ${_wservices} failed!"
fi
fi
umount "${_my_etcdir}"
} # --- End of update_services_file --- #
# ======================================================================
# Routine: sshd_privsep
# MODIFIES: privsep_configured privsep_used
# ======================================================================
sshd_privsep() {
local sshdconfig_tmp
if [ "${privsep_configured}" != "yes" ]
then
if csih_is_nt
then
csih_inform "Privilege separation is set to yes by default since OpenSSH 3.3."
csih_inform "However, this requires a non-privileged account called 'sshd'."
csih_inform "For more info on privilege separation read /usr/share/doc/openssh/README.privsep."
if csih_request "Should privilege separation be used?"
then
privsep_used=yes
if ! csih_create_unprivileged_user sshd
then
csih_warning "Couldn't create user 'sshd'!"
csih_warning "Privilege separation set to 'no' again!"
csih_warning "Check your ${SYSCONFDIR}/sshd_config file!"
privsep_used=no
fi
else
privsep_used=no
fi
else
# On 9x don't use privilege separation. Since security isn't
# available it just adds useless additional processes.
privsep_used=no
fi
fi
# Create default sshd_config from skeleton files in /etc/defaults/etc or
# modify to add the missing privsep configuration option
if cmp "${SYSCONFDIR}/sshd_config" "${SYSCONFDIR}/defaults/${SYSCONFDIR}/sshd_config" >/dev/null 2>&1
then
csih_inform "Updating ${SYSCONFDIR}/sshd_config file"
sshdconfig_tmp=${SYSCONFDIR}/sshd_config.$$
sed -e "s/^#UsePrivilegeSeparation yes/UsePrivilegeSeparation ${privsep_used}/
s/^#Port 22/Port ${port_number}/
s/^#StrictModes yes/StrictModes no/" \
< ${SYSCONFDIR}/sshd_config \
> "${sshdconfig_tmp}"
mv "${sshdconfig_tmp}" ${SYSCONFDIR}/sshd_config
elif [ "${privsep_configured}" != "yes" ]
then
echo >> ${SYSCONFDIR}/sshd_config
echo "UsePrivilegeSeparation ${privsep_used}" >> ${SYSCONFDIR}/sshd_config
fi
} # --- End of sshd_privsep --- #
# ======================================================================
# Routine: update_inetd_conf
# ======================================================================
update_inetd_conf() {
local _inetcnf="${SYSCONFDIR}/inetd.conf"
local _inetcnf_tmp="${SYSCONFDIR}/inetd.conf.$$"
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
if [ -d "${_inetcnf_dir}" ]
then
# we have inetutils-1.5 inetd.d support
if [ -f "${_inetcnf}" ]
then
grep -q '^[ \t]*ssh' "${_inetcnf}" && _with_comment=0
# check for sshd OR ssh in top-level inetd.conf file, and remove
# will be replaced by a file in inetd.d/
if [ `grep -q '^[# \t]*ssh' "${_inetcnf}"; echo $?` -eq 0 ]
then
grep -v '^[# \t]*ssh' "${_inetcnf}" >> "${_inetcnf_tmp}"
if [ -f "${_inetcnf_tmp}" ]
then
if mv "${_inetcnf_tmp}" "${_inetcnf}"
then
csih_inform "Removed ssh[d] from ${_inetcnf}"
else
csih_warning "Removing ssh[d] from ${_inetcnf} failed!"
fi
rm -f "${_inetcnf_tmp}"
else
csih_warning "Removing ssh[d] from ${_inetcnf} failed!"
fi
fi
fi
csih_install_config "${_sshd_inetd_conf}" "${SYSCONFDIR}/defaults"
if cmp "${SYSCONFDIR}/defaults${_sshd_inetd_conf}" "${_sshd_inetd_conf}" >/dev/null 2>&1
then
if [ "${_with_comment}" -eq 0 ]
then
sed -e 's/@COMMENT@[ \t]*//' < "${_sshd_inetd_conf}" > "${_sshd_inetd_conf_tmp}"
else
sed -e 's/@COMMENT@[ \t]*/# /' < "${_sshd_inetd_conf}" > "${_sshd_inetd_conf_tmp}"
fi
mv "${_sshd_inetd_conf_tmp}" "${_sshd_inetd_conf}"
csih_inform "Updated ${_sshd_inetd_conf}"
fi
elif [ -f "${_inetcnf}" ]
then
grep -q '^[ \t]*sshd' "${_inetcnf}" && _with_comment=0
# check for sshd in top-level inetd.conf file, and remove
# will be replaced by a file in inetd.d/
if [ `grep -q '^[# \t]*sshd' "${_inetcnf}"; echo $?` -eq 0 ]
then
grep -v '^[# \t]*sshd' "${_inetcnf}" >> "${_inetcnf_tmp}"
if [ -f "${_inetcnf_tmp}" ]
then
if mv "${_inetcnf_tmp}" "${_inetcnf}"
then
csih_inform "Removed sshd from ${_inetcnf}"
else
csih_warning "Removing sshd from ${_inetcnf} failed!"
fi
rm -f "${_inetcnf_tmp}"
else
csih_warning "Removing sshd from ${_inetcnf} failed!"
fi
fi
# Add ssh line to inetd.conf
if [ `grep -q '^[# \t]*ssh' "${_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
csih_inform "Added ssh to ${_inetcnf}"
fi
fi
} # --- End of update_inetd_conf --- #
# ======================================================================
# Routine: install_service
# Install sshd as a service
# ======================================================================
install_service() {
local run_service_as
local password
if csih_is_nt
then
if ! cygrunsrv -Q sshd >/dev/null 2>&1
then
echo
echo
csih_warning "The following functions require administrator privileges!"
echo
echo -e "${_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
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 cygrunsrv -I sshd -d "CYGWIN sshd" -p /usr/sbin/sshd \
-a "-D" -y tcpip "${cygwin_env[@]}"
then
echo
csih_inform "The sshd service has been installed under the LocalSystem"
csih_inform "account (also known as SYSTEM). To start the service now, call"
csih_inform "\`net start sshd' or \`cygrunsrv -S sshd'. Otherwise, it"
csih_inform "will start automatically after the next reboot."
fi
else
if cygrunsrv -I sshd -d "CYGWIN sshd" -p /usr/sbin/sshd \
-a "-D" -y tcpip "${cygwin_env[@]}" \
-u "${run_service_as}" -w "${password}"
then
echo
csih_inform "The sshd service has been installed under the '${run_service_as}'"
csih_inform "account. To start the service now, call \`net start sshd' or"
csih_inform "\`cygrunsrv -S sshd'. Otherwise, it will start automatically"
csih_inform "after the next reboot."
fi
fi
# now, if successfully installed, set ownership of the affected files
if cygrunsrv -Q sshd >/dev/null 2>&1
then
chown "${run_service_as}" ${SYSCONFDIR}/ssh*
chown "${run_service_as}".544 ${LOCALSTATEDIR}/empty
chown "${run_service_as}".544 ${LOCALSTATEDIR}/log/lastlog
if [ -f ${LOCALSTATEDIR}/log/sshd.log ]
then
chown "${run_service_as}".544 ${LOCALSTATEDIR}/log/sshd.log
fi
else
csih_warning "Something went wrong installing the sshd service."
fi
fi # user allowed us to install as service
fi # service not yet installed
fi # csih_is_nt
} # --- End of install_service --- #
# ======================================================================
# Main Entry Point
# ======================================================================
# Check how the script has been started. If
# (1) it has been started by giving the full path and
# that path is /etc/postinstall, OR
# (2) Otherwise, if the environment variable
# SSH_HOST_CONFIG_AUTO_ANSWER_NO is set
# then set auto_answer to "no". This allows automatic
# creation of the config files in /etc w/o overwriting
# them if they already exist. In both cases, color
# escape sequences are suppressed, so as to prevent
# cluttering setup's logfiles.
if [ "$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
;;
-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: ${progname} [OPTION]..."
echo
echo "This script creates an OpenSSH host configuration."
echo
echo "Options:"
echo " --debug -d Enable shell's debug output."
echo " --yes -y Answer all questions with \"yes\" automatically."
echo " --no -n Answer all questions with \"no\" automatically."
echo " --cygwin -c <options> Use \"options\" as value for CYGWIN environment var."
echo " --port -p <n> sshd listens on port n."
echo " --user -u <account> privileged user for service."
echo " --pwd -w <passwd> Use \"pwd\" as password for privileged user."
echo " --privileged On Windows NT/2k/XP, require privileged user"
echo " instead of LocalSystem for sshd service."
echo
exit 1
;;
esac
done
# ======================================================================
# Action!
# ======================================================================
# Check for running ssh/sshd processes first. Refuse to do anything while
# some ssh processes are still running
if ps -ef | grep -q '/sshd\?$'
then
echo
csih_error "There are still ssh processes running. Please shut them down first."
fi
# Check for ${SYSCONFDIR} directory
csih_make_dir "${SYSCONFDIR}" "Cannot create global configuration files."
chmod 775 "${SYSCONFDIR}"
setfacl -m u:system:rwx "${SYSCONFDIR}"
# Check for /var/log directory
csih_make_dir "${LOCALSTATEDIR}/log" "Cannot create log directory."
chmod 775 "${LOCALSTATEDIR}/log"
setfacl -m u:system:rwx "${LOCALSTATEDIR}/log"
# 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
cat /dev/null > ${LOCALSTATEDIR}/log/lastlog
chmod 644 ${LOCALSTATEDIR}/log/lastlog
fi
# Create /var/empty file used as chroot jail for privilege separation
csih_make_dir "${LOCALSTATEDIR}/empty" "Cannot create ${LOCALSTATEDIR}/empty directory."
chmod 755 "${LOCALSTATEDIR}/empty"
setfacl -m u:system:rwx "${LOCALSTATEDIR}/empty"
# host keys
create_host_keys
# use 'cmp' program to determine if a config file is identical
# to the default version of that config file
csih_check_program_or_error cmp diffutils
# handle ssh_config
csih_install_config "${SYSCONFDIR}/ssh_config" "${SYSCONFDIR}/defaults"
if cmp "${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}" >> ${SYSCONFDIR}/ssh_config
fi
fi
# handle sshd_config (and privsep)
csih_install_config "${SYSCONFDIR}/sshd_config" "${SYSCONFDIR}/defaults"
if ! cmp "${SYSCONFDIR}/sshd_config" "${SYSCONFDIR}/defaults/${SYSCONFDIR}/sshd_config" >/dev/null 2>&1
then
grep -q UsePrivilegeSeparation ${SYSCONFDIR}/sshd_config && privsep_configured=yes
fi
sshd_privsep
update_services_file
update_inetd_conf
install_service
echo
csih_inform "Host configuration finished. Have fun!"
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