samhocevar · October 17, 2024 17:02 · samhocevar · Nov 4, 2019 · elieux · Apr 16, 2020
diff --git a/gistfile1.sh b/gistfile1.sh
 #!/bin/sh
 #
 #  msys2-sshd-setup.sh — configure sshd on MSYS2 and run it as a Windows service
 #
 #  Please report issues and/or improvements to Sam Hocevar <[email protected]>
 #
 #  Prerequisites:
 #    — MSYS2 itself: http://sourceforge.net/projects/msys2/
 #    — admin tools: pacman -S openssh cygrunsrv mingw-w64-x86_64-editrights
 #
 #  This script is a cleaned up and improved version of the procedure initially
 #  found at https://ghc.haskell.org/trac/ghc/wiki/Building/Windows/SSHD
 #
 #  Gotchas:
 #    — the log file will be /var/log/msys2_sshd.log
 #    — if you get error “sshd: fatal: seteuid XXX : No such device or address”
 #      in the logs, try “passwd -R” (with admin privileges)
 #
 #  Changelog:
 #   27 Jun 2019 — rename service to msys2_sshd to avoid conflicts with Windows OpenSSH
 #               — use mkgroup.exe as suggested in the comments
 #               — fix a problem with CRLF and grep
 #   24 Aug 2015 — run server with -e to redirect logs to /var/log/sshd.log
 #

 set -e

 #
 # Configuration
 #

 PRIV_USER=sshd_server
 PRIV_NAME="Privileged user for sshd"
 UNPRIV_USER=sshd # DO NOT CHANGE; this username is hardcoded in the openssh code
 UNPRIV_NAME="Privilege separation user for sshd"

 EMPTY_DIR=/var/empty


 #
 # Check installation sanity
 #

 if ! /mingw64/bin/editrights -h >/dev/null; then
    echo "ERROR: Missing 'editrights'. Try: pacman -S mingw-w64-x86_64-editrights."
    exit 1
 fi

 if ! cygrunsrv -v >/dev/null; then
    echo "ERROR: Missing 'cygrunsrv'. Try: pacman -S cygrunsrv."
    exit 1
 fi

 if ! ssh-keygen -A; then
    echo "ERROR: Missing 'ssh-keygen'. Try: pacman -S openssh."
    exit 1
 fi


 #
 # The privileged cyg_server user
 #

 # Some random password; this is only needed internally by cygrunsrv and
 # is limited to 14 characters by Windows (lol)
 tmp_pass="$(tr -dc 'a-zA-Z0-9' < /dev/urandom | dd count=14 bs=1 2>/dev/null)"

 # Create user
 add="$(if ! net user "${PRIV_USER}" >/dev/null; then echo "//add"; fi)"
 if ! net user "${PRIV_USER}" "${tmp_pass}" ${add} //fullname:"${PRIV_NAME}" \
              //homedir:"$(cygpath -w ${EMPTY_DIR})" //yes; then
    echo "ERROR: Unable to create Windows user ${PRIV_USER}"
    exit 1
 fi

 # Add user to the Administrators group if necessary
 admingroup="$(mkgroup -l | awk -F: '{if ($2 == "S-1-5-32-544") print $1;}')"
 if ! (net localgroup "${admingroup}" | grep -q '^'"${PRIV_USER}"'\>'); then
    if ! net localgroup "${admingroup}" "${PRIV_USER}" //add; then
        echo "ERROR: Unable to add user ${PRIV_USER} to group ${admingroup}"
        exit 1
    fi
 fi

 # Infinite passwd expiry
 passwd -e "${PRIV_USER}"

 # set required privileges
 for flag in SeAssignPrimaryTokenPrivilege SeCreateTokenPrivilege \
  SeTcbPrivilege SeDenyRemoteInteractiveLogonRight SeServiceLogonRight; do
    if ! /mingw64/bin/editrights -a "${flag}" -u "${PRIV_USER}"; then
        echo "ERROR: Unable to give ${flag} rights to user ${PRIV_USER}"
        exit 1
    fi
 done


 #
 # The unprivileged sshd user (for privilege separation)
 #

 add="$(if ! net user "${UNPRIV_USER}" >/dev/null; then echo "//add"; fi)"
 if ! net user "${UNPRIV_USER}" ${add} //fullname:"${UNPRIV_NAME}" \
              //homedir:"$(cygpath -w ${EMPTY_DIR})" //active:no; then
    echo "ERROR: Unable to create Windows user ${PRIV_USER}"
    exit 1
 fi


 #
 # Add or update /etc/passwd entries
 #

 touch /etc/passwd
 for u in "${PRIV_USER}" "${UNPRIV_USER}"; do
    sed -i -e '/^'"${u}"':/d' /etc/passwd
    SED='/^'"${u}"':/s?^\(\([^:]*:\)\{5\}\).*?\1'"${EMPTY_DIR}"':/bin/false?p'
    mkpasswd -l -u "${u}" | sed -e 's/^[^:]*+//' | sed -ne "${SED}" \
             >> /etc/passwd
 done
 mkgroup.exe -l > /etc/group


 #
 # Finally, register service with cygrunsrv and start it
 #

 cygrunsrv -R msys2_sshd || true
 cygrunsrv -I msys2_sshd -d "MSYS2 sshd" -p \
          /usr/bin/sshd.exe -a "-D -e" -y tcpip -u "${PRIV_USER}" -w "${tmp_pass}"

 # The SSH service should start automatically when Windows is rebooted. You can
 # manually restart the service by running `net stop msys2_sshd` + `net start msys2_sshd`
 if ! net start msys2_sshd; then
    echo "ERROR: Unable to start msys2_sshd service"
    exit 1
 fi
	#!/bin/sh
	#
	# msys2-sshd-setup.sh — configure sshd on MSYS2 and run it as a Windows service
	#
	# Please report issues and/or improvements to Sam Hocevar <[email protected]>
	#
	# Prerequisites:
	# — MSYS2 itself: http://sourceforge.net/projects/msys2/
	# — admin tools: pacman -S openssh cygrunsrv mingw-w64-x86_64-editrights
	#
	# This script is a cleaned up and improved version of the procedure initially
	# found at https://ghc.haskell.org/trac/ghc/wiki/Building/Windows/SSHD
	#
	# Gotchas:
	# — the log file will be /var/log/msys2_sshd.log
	# — if you get error “sshd: fatal: seteuid XXX : No such device or address”
	# in the logs, try “passwd -R” (with admin privileges)
	#
	# Changelog:
	# 27 Jun 2019 — rename service to msys2_sshd to avoid conflicts with Windows OpenSSH
	# — use mkgroup.exe as suggested in the comments
	# — fix a problem with CRLF and grep
	# 24 Aug 2015 — run server with -e to redirect logs to /var/log/sshd.log
	#

	set -e

	#
	# Configuration
	#

	PRIV_USER=sshd_server
	PRIV_NAME="Privileged user for sshd"
	UNPRIV_USER=sshd # DO NOT CHANGE; this username is hardcoded in the openssh code
	UNPRIV_NAME="Privilege separation user for sshd"

	EMPTY_DIR=/var/empty


	#
	# Check installation sanity
	#

	if ! /mingw64/bin/editrights -h >/dev/null; then
	echo "ERROR: Missing 'editrights'. Try: pacman -S mingw-w64-x86_64-editrights."
	exit 1
	fi

	if ! cygrunsrv -v >/dev/null; then
	echo "ERROR: Missing 'cygrunsrv'. Try: pacman -S cygrunsrv."
	exit 1
	fi

	if ! ssh-keygen -A; then
	echo "ERROR: Missing 'ssh-keygen'. Try: pacman -S openssh."
	exit 1
	fi


	#
	# The privileged cyg_server user
	#

	# Some random password; this is only needed internally by cygrunsrv and
	# is limited to 14 characters by Windows (lol)
	tmp_pass="$(tr -dc 'a-zA-Z0-9' < /dev/urandom \| dd count=14 bs=1 2>/dev/null)"

	# Create user
	add="$(if ! net user "${PRIV_USER}" >/dev/null; then echo "//add"; fi)"
	if ! net user "${PRIV_USER}" "${tmp_pass}" ${add} //fullname:"${PRIV_NAME}" \
	//homedir:"$(cygpath -w ${EMPTY_DIR})" //yes; then
	echo "ERROR: Unable to create Windows user ${PRIV_USER}"
	exit 1
	fi

	# Add user to the Administrators group if necessary
	admingroup="$(mkgroup -l \| awk -F: '{if ($2 == "S-1-5-32-544") print $1;}')"
	if ! (net localgroup "${admingroup}" \| grep -q '^'"${PRIV_USER}"'\>'); then
	if ! net localgroup "${admingroup}" "${PRIV_USER}" //add; then
	echo "ERROR: Unable to add user ${PRIV_USER} to group ${admingroup}"
	exit 1
	fi
	fi

	# Infinite passwd expiry
	passwd -e "${PRIV_USER}"

	# set required privileges
	for flag in SeAssignPrimaryTokenPrivilege SeCreateTokenPrivilege \
	SeTcbPrivilege SeDenyRemoteInteractiveLogonRight SeServiceLogonRight; do
	if ! /mingw64/bin/editrights -a "${flag}" -u "${PRIV_USER}"; then
	echo "ERROR: Unable to give ${flag} rights to user ${PRIV_USER}"
	exit 1
	fi
	done


	#
	# The unprivileged sshd user (for privilege separation)
	#

	add="$(if ! net user "${UNPRIV_USER}" >/dev/null; then echo "//add"; fi)"
	if ! net user "${UNPRIV_USER}" ${add} //fullname:"${UNPRIV_NAME}" \
	//homedir:"$(cygpath -w ${EMPTY_DIR})" //active:no; then
	echo "ERROR: Unable to create Windows user ${PRIV_USER}"
	exit 1
	fi


	#
	# Add or update /etc/passwd entries
	#

	touch /etc/passwd
	for u in "${PRIV_USER}" "${UNPRIV_USER}"; do
	sed -i -e '/^'"${u}"':/d' /etc/passwd
	SED='/^'"${u}"':/s?^\(\([^:]:\)\{5\}\).?\1'"${EMPTY_DIR}"':/bin/false?p'
	mkpasswd -l -u "${u}" \| sed -e 's/^[^:]*+//' \| sed -ne "${SED}" \
	>> /etc/passwd
	done
	mkgroup.exe -l > /etc/group


	#
	# Finally, register service with cygrunsrv and start it
	#

	cygrunsrv -R msys2_sshd \|\| true
	cygrunsrv -I msys2_sshd -d "MSYS2 sshd" -p \
	/usr/bin/sshd.exe -a "-D -e" -y tcpip -u "${PRIV_USER}" -w "${tmp_pass}"

	# The SSH service should start automatically when Windows is rebooted. You can
	# manually restart the service by running `net stop msys2_sshd` + `net start msys2_sshd`
	if ! net start msys2_sshd; then
	echo "ERROR: Unable to start msys2_sshd service"
	exit 1
	fi
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