Improved user disconnection to avoid race conditions

Previously when we were disconnecting a user there were few seconds
after which the cookie was still valid, so a reconnect would succeed
by the same user. This change ensures that a disconnected (via occtl)
user cannot re-use the same cookie to connect. That enables a safe
user removal from the authentication database, and from run-time.

Resolves: #59

Signed-off-by: Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>

tests/Makefile.am

@@ -40,7 +40,8 @@ EXTRA_DIST = certs/ca-key.pem certs/ca.pem ns.sh common.sh certs/server-cert.pem
 	connect-ios-script data/apple-ios.config certs/kerberos-cert.pem \
 	data/kdc.conf data/krb5.conf data/k5.KERBEROS.TEST data/kadm5.acl \
 	data/ipv6-iface.config data/no-route-default.config data/no-route-group.config \
-	data/group-config/group1 data/test-namespace-listen.config
+	data/group-config/group1 data/test-namespace-listen.config data/disconnect-user.config \
+	data/disconnect-user2.config
 
 SUBDIRS = docker-ocserv
 
@@ -65,7 +66,7 @@ dist_check_SCRIPTS += haproxy-connect test-iroute test-multi-cookie test-pass-sc
 	test-cookie-timeout test-cookie-timeout-2 test-explicit-ip \
 	test-cookie-invalidation test-user-config test-append-routes test-ban \
 	multiple-routes json test-udp-listen-host test-max-same-1 test-script-multi-user \
-	apple-ios ipv6-iface test-namespace-listen
+	apple-ios ipv6-iface test-namespace-listen disconnect-user disconnect-user2
 
 if RADIUS_ENABLED
 dist_check_SCRIPTS += radius-group radius-otp

tests/data/disconnect-user.config

@@ -0,0 +1,188 @@
+# User authentication method. Could be set multiple times and in that case
+# all should succeed.
+# Options: certificate, pam.
+#auth = "certificate"
+auth = "plain[@SRCDIR@/data/test1.passwd]"
+#auth = "pam"
+
+isolate-workers = @ISOLATE_WORKERS@
+
+max-ban-score = 0
+
+# A banner to be displayed on clients
+#banner = "Welcome"
+
+# Use listen-host to limit to specific IPs or to the IPs of a provided hostname.
+#listen-host = @ADDRESS@
+
+use-dbus = no
+
+# Limit the number of clients. Unset or set to zero for unlimited.
+#max-clients = 1024
+max-clients = 16
+
+listen-proxy-proto = false
+
+# Limit the number of client connections to one every X milliseconds
+# (X is the provided value). Set to zero for no limit.
+#rate-limit-ms = 100
+
+# Limit the number of identical clients (i.e., users connecting multiple times)
+# Unset or set to zero for unlimited.
+max-same-clients = 2
+
+# TCP and UDP port number
+tcp-port = @PORT@
+udp-port = @PORT@
+
+# Keepalive in seconds
+keepalive = 32400
+
+# Dead peer detection in seconds
+dpd = 440
+
+# MTU discovery (DPD must be enabled)
+try-mtu-discovery = false
+
+# The key and the certificates of the server
+# The key may be a file, or any URL supported by GnuTLS (e.g.,
+# tpmkey:uuid=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx;storage=user
+# or pkcs11:object=my-vpn-key;object-type=private)
+#
+# There may be multiple certificate and key pairs and each key
+# should correspond to the preceding certificate.
+server-cert = @SRCDIR@/certs/server-cert.pem
+server-key = @SRCDIR@/certs/server-key.pem
+
+# Diffie-Hellman parameters. Only needed if you require support
+# for the DHE ciphersuites (by default this server supports ECDHE).
+# Can be generated using:
+# certtool --generate-dh-params --outfile /path/to/dh.pem
+#dh-params = /path/to/dh.pem
+
+# If you have a certificate from a CA that provides an OCSP
+# service you may provide a fresh OCSP status response within
+# the TLS handshake. That will prevent the client from connecting
+# independently on the OCSP server.
+# You can update this response periodically using:
+# ocsptool --ask --load-cert=your_cert --load-issuer=your_ca --outfile response
+# Make sure that you replace the following file in an atomic way.
+#ocsp-response = /path/to/ocsp.der
+
+# In case PKCS #11 or TPM keys are used the PINs should be available
+# in files. The srk-pin-file is applicable to TPM keys only (It's the storage
+# root key).
+#pin-file = /path/to/pin.txt
+#srk-pin-file = /path/to/srkpin.txt
+
+# The Certificate Authority that will be used
+# to verify clients if certificate authentication
+# is set.
+#ca-cert = /path/to/ca.pem
+
+# The object identifier that will be used to read the user ID in the client certificate.
+# The object identifier should be part of the certificate's DN
+# Useful OIDs are:
+#  CN = 2.5.4.3, UID = 0.9.2342.19200300.100.1.1
+#cert-user-oid = 0.9.2342.19200300.100.1.1
+
+# The object identifier that will be used to read the user group in the client
+# certificate. The object identifier should be part of the certificate's DN
+# Useful OIDs are:
+#  OU (organizational unit) = 2.5.4.11
+#cert-group-oid = 2.5.4.11
+
+# A revocation list of ca-cert is set
+#crl = /path/to/crl.pem
+
+# GnuTLS priority string
+tls-priorities = "PERFORMANCE:%SERVER_PRECEDENCE:%COMPAT"
+
+# To enforce perfect forward secrecy (PFS) on the main channel.
+#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA"
+
+# The time (in seconds) that a client is allowed to stay connected prior
+# to authentication
+auth-timeout = 40
+
+# The time (in seconds) that a client is not allowed to reconnect after
+# a failed authentication attempt.
+#min-reauth-time = 2
+
+# Script to call when a client connects and obtains an IP
+# Parameters are passed on the environment.
+# REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client),
+# DEVICE, IP_REAL (the real IP of the client), IP_LOCAL (the local IP
+# in the P-t-P connection), IP_REMOTE (the VPN IP of the client). REASON
+# may be "connect" or "disconnect".
+#connect-script = /usr/bin/myscript
+#disconnect-script = /usr/bin/myscript
+
+# UTMP
+#use-utmp = true
+
+# PID file
+#pid-file = ./ocserv.pid
+
+# The default server directory. Does not require any devices present.
+#chroot-dir = /path/to/chroot
+
+# socket file used for IPC, will be appended with .PID
+# It must be accessible within the chroot environment (if any)
+socket-file = ./ocserv-socket
+
+occtl-socket-file = @OCCTL_SOCKET@
+use-occtl = true
+
+# The user the worker processes will be run as. It should be
+# unique (no other services run as this user).
+run-as-user = @USERNAME@
+run-as-group = @GROUP@
+
+# Network settings
+
+device = vpns
+
+# The default domain to be advertised
+default-domain = example.com
+
+ipv4-network = @VPNNET@
+# Use the keywork local to advertize the local P-t-P address as DNS server
+ipv4-dns = 192.168.1.1
+
+# The NBNS server (if any)
+#ipv4-nbns = 192.168.2.3
+
+ipv6-network = @VPNNET6@
+#address =
+#ipv6-mask =
+#ipv6-dns =
+
+# Prior to leasing any IP from the pool ping it to verify that
+# it is not in use by another (unrelated to this server) host.
+ping-leases = false
+
+# Leave empty to assign the default MTU of the device
+# mtu =
+
+#route = 192.168.1.0/255.255.255.0
+#route = 192.168.5.0/255.255.255.0
+
+#
+# The following options are for (experimental) AnyConnect client
+# compatibility. They are only available if the server is built
+# with --enable-anyconnect
+#
+
+# Client profile xml. A sample file exists in doc/profile.xml.
+# This file must be accessible from inside the worker's chroot.
+# The profile is ignored by the openconnect client.
+#user-profile = profile.xml
+
+# Unless set to false it is required for clients to present their
+# certificate even if they are authenticating via a previously granted
+# cookie. Legacy CISCO clients do not do that, and thus this option
+# should be set for them.
+#always-require-cert = false
+
+debug-no-secmod-stats = true

tests/data/disconnect-user2.config

@@ -0,0 +1,186 @@
+# User authentication method. Could be set multiple times and in that case
+# all should succeed.
+# Options: certificate, pam.
+#auth = "certificate"
+auth = "plain[@SRCDIR@/data/test1.passwd]"
+#auth = "pam"
+
+isolate-workers = @ISOLATE_WORKERS@
+
+max-ban-score = 0
+
+# A banner to be displayed on clients
+#banner = "Welcome"
+
+# Use listen-host to limit to specific IPs or to the IPs of a provided hostname.
+#listen-host = @ADDRESS@
+
+use-dbus = no
+
+# Limit the number of clients. Unset or set to zero for unlimited.
+#max-clients = 1024
+max-clients = 16
+
+listen-proxy-proto = false
+
+# Limit the number of client connections to one every X milliseconds
+# (X is the provided value). Set to zero for no limit.
+#rate-limit-ms = 100
+
+# Limit the number of identical clients (i.e., users connecting multiple times)
+# Unset or set to zero for unlimited.
+max-same-clients = 2
+
+# TCP and UDP port number
+tcp-port = @PORT@
+udp-port = @PORT@
+
+# Keepalive in seconds
+keepalive = 32400
+
+# Dead peer detection in seconds
+dpd = 440
+
+# MTU discovery (DPD must be enabled)
+try-mtu-discovery = false
+
+# The key and the certificates of the server
+# The key may be a file, or any URL supported by GnuTLS (e.g.,
+# tpmkey:uuid=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx;storage=user
+# or pkcs11:object=my-vpn-key;object-type=private)
+#
+# There may be multiple certificate and key pairs and each key
+# should correspond to the preceding certificate.
+server-cert = @SRCDIR@/certs/server-cert.pem
+server-key = @SRCDIR@/certs/server-key.pem
+
+# Diffie-Hellman parameters. Only needed if you require support
+# for the DHE ciphersuites (by default this server supports ECDHE).
+# Can be generated using:
+# certtool --generate-dh-params --outfile /path/to/dh.pem
+#dh-params = /path/to/dh.pem
+
+# If you have a certificate from a CA that provides an OCSP
+# service you may provide a fresh OCSP status response within
+# the TLS handshake. That will prevent the client from connecting
+# independently on the OCSP server.
+# You can update this response periodically using:
+# ocsptool --ask --load-cert=your_cert --load-issuer=your_ca --outfile response
+# Make sure that you replace the following file in an atomic way.
+#ocsp-response = /path/to/ocsp.der
+
+# In case PKCS #11 or TPM keys are used the PINs should be available
+# in files. The srk-pin-file is applicable to TPM keys only (It's the storage
+# root key).
+#pin-file = /path/to/pin.txt
+#srk-pin-file = /path/to/srkpin.txt
+
+# The Certificate Authority that will be used
+# to verify clients if certificate authentication
+# is set.
+#ca-cert = /path/to/ca.pem
+
+# The object identifier that will be used to read the user ID in the client certificate.
+# The object identifier should be part of the certificate's DN
+# Useful OIDs are:
+#  CN = 2.5.4.3, UID = 0.9.2342.19200300.100.1.1
+#cert-user-oid = 0.9.2342.19200300.100.1.1
+
+# The object identifier that will be used to read the user group in the client
+# certificate. The object identifier should be part of the certificate's DN
+# Useful OIDs are:
+#  OU (organizational unit) = 2.5.4.11
+#cert-group-oid = 2.5.4.11
+
+# A revocation list of ca-cert is set
+#crl = /path/to/crl.pem
+
+# GnuTLS priority string
+tls-priorities = "PERFORMANCE:%SERVER_PRECEDENCE:%COMPAT"
+
+# To enforce perfect forward secrecy (PFS) on the main channel.
+#tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-RSA"
+
+# The time (in seconds) that a client is allowed to stay connected prior
+# to authentication
+auth-timeout = 40
+
+# The time (in seconds) that a client is not allowed to reconnect after
+# a failed authentication attempt.
+#min-reauth-time = 2
+
+# Script to call when a client connects and obtains an IP
+# Parameters are passed on the environment.
+# REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client),
+# DEVICE, IP_REAL (the real IP of the client), IP_LOCAL (the local IP
+# in the P-t-P connection), IP_REMOTE (the VPN IP of the client). REASON
+# may be "connect" or "disconnect".
+#connect-script = /usr/bin/myscript
+#disconnect-script = /usr/bin/myscript
+
+# UTMP
+#use-utmp = true
+
+# PID file
+#pid-file = ./ocserv.pid
+
+# The default server directory. Does not require any devices present.
+#chroot-dir = /path/to/chroot
+
+# socket file used for IPC, will be appended with .PID
+# It must be accessible within the chroot environment (if any)
+socket-file = ./ocserv-socket
+
+occtl-socket-file = @OCCTL_SOCKET@
+use-occtl = true
+
+# The user the worker processes will be run as. It should be
+# unique (no other services run as this user).
+run-as-user = @USERNAME@
+run-as-group = @GROUP@
+
+# Network settings
+
+device = vpns
+
+# The default domain to be advertised
+default-domain = example.com
+
+ipv4-network = @VPNNET@
+# Use the keywork local to advertize the local P-t-P address as DNS server
+ipv4-dns = 192.168.1.1
+
+# The NBNS server (if any)
+#ipv4-nbns = 192.168.2.3
+
+ipv6-network = @VPNNET6@
+#address =
+#ipv6-mask =
+#ipv6-dns =
+
+# Prior to leasing any IP from the pool ping it to verify that
+# it is not in use by another (unrelated to this server) host.
+ping-leases = false
+
+# Leave empty to assign the default MTU of the device
+# mtu =
+
+#route = 192.168.1.0/255.255.255.0
+#route = 192.168.5.0/255.255.255.0
+
+#
+# The following options are for (experimental) AnyConnect client
+# compatibility. They are only available if the server is built
+# with --enable-anyconnect
+#
+
+# Client profile xml. A sample file exists in doc/profile.xml.
+# This file must be accessible from inside the worker's chroot.
+# The profile is ignored by the openconnect client.
+#user-profile = profile.xml
+
+# Unless set to false it is required for clients to present their
+# certificate even if they are authenticating via a previously granted
+# cookie. Legacy CISCO clients do not do that, and thus this option
+# should be set for them.
+#always-require-cert = false

tests/data/test-traffic.config

@@ -109,12 +109,6 @@ auth-timeout = 40
 # a failed authentication attempt.
 #min-reauth-time = 2
 
-# Cookie validity time (in seconds)
-# Once a client is authenticated he's provided a cookie with
-# which he can reconnect. This option sets the maximum lifetime
-# of that cookie.
-cookie-validity = 172800
-
 # Script to call when a client connects and obtains an IP
 # Parameters are passed on the environment.
 # REASON, USERNAME, GROUPNAME, HOSTNAME (the hostname selected by client), 

tests/disconnect-user

@@ -0,0 +1,121 @@
+#!/bin/bash
+#
+# Copyright (C) 2020 Nikos Mavrogiannopoulos
+#
+# This file is part of ocserv.
+#
+# ocserv is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at
+# your option) any later version.
+#
+# ocserv is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+
+# This test checks whether an explicitly disconnected user via occtl
+# can connect again using its cookie. It uses debug-no-secmod-stats = true
+# to ensure that it is testing the worst case scenario where the worker
+# process has died without notifying sec-mod.
+
+OCCTL="${OCCTL:-../src/occtl/occtl}"
+SERV="${SERV:-../src/ocserv}"
+srcdir=${srcdir:-.}
+PORT=4477
+TMPFILE=ocfile.$$.tmp
+PIDFILE=ocserv-pid.$$.tmp
+CLIPID=oc-pid.$$.tmp
+OCCTL_SOCKET=./occtl-$$.socket
+
+. `dirname $0`/common.sh
+
+if test "$(id -u)" != "0";then
+	echo "This test must be run as root"
+	exit 77
+fi
+
+echo "Testing ocserv disconnection via occtl... "
+
+function finish {
+  set +e
+  echo " * Cleaning up..."
+  test -n "${PID}" && kill ${PID} >/dev/null 2>&1
+  test -n "${PIDFILE}" && rm -f ${PIDFILE} >/dev/null 2>&1
+  test -n "${CLIPID}" && test -f "${CLIPID}" && kill $(cat ${CLIPID}) >/dev/null 2>&1
+  test -n "${CLIPID}" && rm -f ${CLIPID} >/dev/null 2>&1
+  test -n "${CONFIG}" && rm -f ${CONFIG} >/dev/null 2>&1
+  test -n "${TMPFILE}" && rm -f ${TMPFILE} >/dev/null 2>&1
+}
+trap finish EXIT
+
+# server address
+ADDRESS=10.236.2.1
+CLI_ADDRESS=10.236.1.1
+VPNNET=192.168.1.0/24
+VPNADDR=192.168.1.1
+VPNNET6=fcbe:735c:407a:3b62:164d:fa21:1495:0/112
+VPNADDR6=fcbe:735c:407a:3b62:164d:fa21:1495:1
+
+. `dirname $0`/ns.sh
+
+# Run servers
+update_config disconnect-user.config
+if test "$VERBOSE" = 1;then
+DEBUG="-d 3"
+fi
+
+${CMDNS2} ${SERV} -p ${PIDFILE} -f -c ${CONFIG} ${DEBUG} & PID=$!
+
+sleep 3
+
+# Run clients
+echo " * Getting cookie from ${ADDRESS}:${PORT}..."
+( echo "test" | ${CMDNS1} ${OPENCONNECT} ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --authenticate >${TMPFILE} )
+if test $? != 0;then
+	echo "Could not get cookie from server"
+	exit 1
+fi
+
+eval $(cat ${TMPFILE})
+echo " * Connecting to ${ADDRESS}:${PORT}..."
+( ${CMDNS1} ${OPENCONNECT} -q ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 -s ${srcdir}/scripts/vpnc-script -C "${COOKIE}" --pid-file=${CLIPID} -b )
+if test $? != 0;then
+	echo "Could not connect to server"
+	exit 1
+fi
+
+set -e
+echo " * ping remote address"
+
+${CMDNS1} ping -c 3 ${VPNADDR}
+
+set +e
+
+${OCCTL} -s ${OCCTL_SOCKET} disconnect user test
+if test $? != 0;then
+        echo "occtl didn't find connected user!"
+        exit 1
+fi
+
+echo " * Re-connecting to obtain cookie after disconnect... "
+( ${CMDNS1} ${OPENCONNECT} -q ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 -s ${srcdir}/scripts/vpnc-script -C "${COOKIE}" --pid-file=${CLIPID} -b )
+if test $? = 0;then
+	echo "Succeeded using the cookie to connect"
+	exit 1
+fi
+
+sleep 2
+
+${OCCTL} -s ${OCCTL_SOCKET} show user test
+if test $? = 0;then
+        echo "occtl found disconnected user!"
+        exit 1
+fi
+
+exit 0

tests/disconnect-user2

@@ -0,0 +1,119 @@
+#!/bin/bash
+#
+# Copyright (C) 2020 Nikos Mavrogiannopoulos
+#
+# This file is part of ocserv.
+#
+# ocserv is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at
+# your option) any later version.
+#
+# ocserv is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+
+# This test checks whether an explicitly disconnected user via occtl
+# can connect again using its cookie.
+
+OCCTL="${OCCTL:-../src/occtl/occtl}"
+SERV="${SERV:-../src/ocserv}"
+srcdir=${srcdir:-.}
+PORT=4459
+TMPFILE=ocfile.$$.tmp
+PIDFILE=ocserv-pid.$$.tmp
+CLIPID=oc-pid.$$.tmp
+OCCTL_SOCKET=./occtl-$$.socket
+
+. `dirname $0`/common.sh
+
+if test "$(id -u)" != "0";then
+	echo "This test must be run as root"
+	exit 77
+fi
+
+echo "Testing ocserv disconnection via occtl... "
+
+function finish {
+  set +e
+  echo " * Cleaning up..."
+  test -n "${PID}" && kill ${PID} >/dev/null 2>&1
+  test -n "${PIDFILE}" && rm -f ${PIDFILE} >/dev/null 2>&1
+  test -n "${CLIPID}" && test -f ${CLIPID} && kill $(cat ${CLIPID}) >/dev/null 2>&1
+  test -n "${CLIPID}" && rm -f ${CLIPID} >/dev/null 2>&1
+  test -n "${CONFIG}" && rm -f ${CONFIG} >/dev/null 2>&1
+  test -n "${TMPFILE}" && rm -f ${TMPFILE} >/dev/null 2>&1
+}
+trap finish EXIT
+
+# server address
+ADDRESS=10.32.81.0
+CLI_ADDRESS=10.32.80.1
+VPNNET=192.168.1.0/24
+VPNADDR=192.168.1.1
+VPNNET6=fcbe:735c:407a:3fc2:164d:fa21:1495:0/112
+VPNADDR6=fcbe:735c:407a:3fc2:164d:fa21:1495:1
+
+. `dirname $0`/ns.sh
+
+# Run servers
+update_config disconnect-user2.config
+if test "$VERBOSE" = 1;then
+DEBUG="-d 3"
+fi
+
+${CMDNS2} ${SERV} -p ${PIDFILE} -f -c ${CONFIG} ${DEBUG} & PID=$!
+
+sleep 3
+
+# Run clients
+echo " * Getting cookie from ${ADDRESS}:${PORT}..."
+( echo "test" | ${CMDNS1} ${OPENCONNECT} ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 --authenticate >${TMPFILE} )
+if test $? != 0;then
+	echo "Could not get cookie from server"
+	exit 1
+fi
+
+eval $(cat ${TMPFILE})
+echo " * Connecting to ${ADDRESS}:${PORT}..."
+( ${CMDNS1} ${OPENCONNECT} -q ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 -s ${srcdir}/scripts/vpnc-script -C "${COOKIE}" --pid-file=${CLIPID} -b )
+if test $? != 0;then
+	echo "Could not connect to server"
+	exit 1
+fi
+
+set -e
+echo " * ping remote address"
+
+${CMDNS1} ping -c 3 ${VPNADDR}
+
+set +e
+
+${OCCTL} -s ${OCCTL_SOCKET} disconnect user test
+if test $? != 0;then
+        echo "occtl didn't find connected user!"
+        exit 1
+fi
+
+echo " * Re-connecting to obtain cookie after disconnect... "
+( ${CMDNS1} ${OPENCONNECT} -q ${ADDRESS}:${PORT} -u test --servercert=d66b507ae074d03b02eafca40d35f87dd81049d3 -s ${srcdir}/scripts/vpnc-script -C "${COOKIE}" --pid-file=${CLIPID} -b )
+if test $? = 0;then
+	echo "Succeeded using the cookie to connect"
+	exit 1
+fi
+
+sleep 2
+
+${OCCTL} -s ${OCCTL_SOCKET} show user test
+if test $? = 0;then
+        echo "occtl found disconnected user!"
+        exit 1
+fi
+
+exit 0