v-add-sys-ssh-jail

#!/bin/bash
# info: add system ssh jail
# options: [RESTART]
#
# example: v-add-sys-ssh-jail yes
#
# This function enables ssh jailed environment.

#----------------------------------------------------------#
#                Variables & Functions                     #
#----------------------------------------------------------#

# Includes
# shellcheck source=/etc/hestiacp/hestia.conf
source /etc/hestiacp/hestia.conf
# shellcheck source=/usr/local/hestia/func/main.sh
source $HESTIA/func/main.sh
# load config file
source_conf "$HESTIA/conf/hestia.conf"

restart=$1

#----------------------------------------------------------#
#                    Verifications                         #
#----------------------------------------------------------#

# Checking if jailkit is installed
if [ ! -x /sbin/jk_init ]; then
	exit
fi

# Checking if bubblewrap is installed
if [ ! -x /bin/bwrap ]; then
	exit
fi

# Perform verification if read-only mode is enabled
check_hestia_demo_mode

#----------------------------------------------------------#
#                       Action                             #
#----------------------------------------------------------#

# Move jailbash to /usr/sbin
if [ ! -x /usr/sbin/jailbash ]; then
	cp -f $HESTIA_COMMON_DIR/bubblewrap/jailbash /usr/sbin/jailbash
	cp -f $HESTIA_COMMON_DIR/bubblewrap/bwrap-userns-restrict /etc/apparmor.d/bwrap-userns-restrict
	chmod +x /usr/sbin/jailbash

	service apparmor reload > /dev/null 2>&1
fi

# Register /usr/sbin/jailbash
if [ -z "$(grep ^/usr/sbin/jailbash /etc/shells)" ]; then
	echo "/usr/sbin/jailbash" >> /etc/shells
fi

# Checking sshd directives
config='/etc/ssh/sshd_config'
ssh_i=$(grep -n "^# Hestia SSH Chroot" $config)

# Enabling jailed ssh
if [ -z "$ssh_i" ]; then
	echo " " >> $config
	echo "# Hestia SSH Chroot" >> $config
	echo "Match Group ssh-jailed" >> $config
	echo "    ChrootDirectory /srv/jail/%u" >> $config
	echo "    X11Forwarding no" >> $config
	echo "    AllowTCPForwarding no" >> $config
	restart='yes'
fi

# Validating opensshd config
if [ "$restart" = 'yes' ]; then
	subj="OpenSSH restart failed"
	email=$(grep CONTACT "$HESTIA/data/users/$ROOT_USER/user.conf" | cut -f 2 -d \')
	/usr/sbin/sshd -t > /dev/null 2>&1
	if [ "$?" -ne 0 ]; then
		mail_text="OpenSSH can not be restarted. Please check config:
            \n\n$(/usr/sbin/sshd -t)"
		echo -e "$mail_text" | $SENDMAIL -s "$subj" $email
	else
		service sshd restart > /dev/null 2>&1
	fi
fi

# Adding group
groupadd ssh-jailed 2> /dev/null

# Checking jailkit init
jk_init='/etc/jailkit/jk_init.ini'
jk_php_i=$(grep -n "^# Hestia Jail Settings" $jk_init)

# Add PHP to jailkit init to allow usage of it within jail
if [ -z "$jk_php_i" ]; then
	cp -f $HESTIA_COMMON_DIR/jailkit/jk_init.ini /etc/jailkit
fi

# Restart ssh service
if [ "$restart" = 'no' ]; then
	# Skip restart of SSH daemon
	echo "" > /dev/null 2>&1
else
	service ssh restart > /dev/null 2>&1
fi

# Jails need maintenance to update the binaries within the jail. To do so we just reset the chroot
# and reapply the jail
for user in $("$BIN/v-list-users" list); do
	check_jail_enabled=$(grep "SHELL_JAIL_ENABLED='yes'" $HESTIA/data/users/$user/user.conf)

	# If jail enabled try to jail the user
	if [ -n "$check_jail_enabled" ]; then
		$BIN/v-add-user-ssh-jail "$user" "no"
	fi
done

# Add v-add-sys-ssh-jail to startup
if [ ! -e "/etc/cron.d/hestia-ssh-jail" ]; then
	echo "@reboot root sleep 60 && /usr/local/hestia/bin/v-add-sys-ssh-jail > /dev/null" > /etc/cron.d/hestia-ssh-jail
fi

#----------------------------------------------------------#
#                       Hestia                             #
#----------------------------------------------------------#

# Logging
log_event "$OK" "$ARGUMENTS"

exit