OpenVPN: Update to version 2.4.4 .

  ovpnmain.cgi includes new directive '--ncp-disable' to disable for the first the cipher negotiation.
    script-security flag 'system' has been dropped cause of security concerns.
    Directive changes/explanations can be found in here https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage .

Update script for OpenVPN CRL has been integrated since OpenVPN refactors the CRL handling since v.2.4.0 .
    Script checks the next update field from the CRL and preforms an update two days before it expires.
    Script is placed under fcron.daily for daily checks.
    Changes can be found in here https://github.com/OpenVPN/openvpn/commit/160504a2955c4478cd2c0323452929e07016a336 .

update.sh for Core 118 includes needed server.conf changes but also an update of the CRL to prevent connection problems
    if systems have already an expired CRL.
    Server stop and start if active will be also executed.

Signed-off-by: Erik Kapfer <erik.kapfer@ipfire.org>
---
 config/rootfiles/common/openvpn     |  5 ++++-
 config/rootfiles/core/118/update.sh | 13 +++++++++++++
 html/cgi-bin/ovpnmain.cgi           |  3 ++-
 lfs/openvpn                         | 11 ++++++++---
 4 files changed, 27 insertions(+), 5 deletions(-)
  

Hi,
forgot the CRL updater please ignore v1, PATCH v2 should include all.

Best,

Erik

Am 26.01.2018 um 12:16 schrieb Erik Kapfer:

> ovpnmain.cgi includes new directive '--ncp-disable' to disable for the first the cipher negotiation.
>    script-security flag 'system' has been dropped cause of security concerns.
>    Directive changes/explanations can be found in here https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage .
> 
> Update script for OpenVPN CRL has been integrated since OpenVPN refactors the CRL handling since v.2.4.0 .
>    Script checks the next update field from the CRL and preforms an update two days before it expires.
>    Script is placed under fcron.daily for daily checks.
>    Changes can be found in here https://github.com/OpenVPN/openvpn/commit/160504a2955c4478cd2c0323452929e07016a336 .
> 
> update.sh for Core 118 includes needed server.conf changes but also an update of the CRL to prevent connection problems
>    if systems have already an expired CRL.
>    Server stop and start if active will be also executed.
> 
> Signed-off-by: Erik Kapfer <erik.kapfer@ipfire.org>
> ---
> config/ovpn/ovpn_crl_updater.sh     | 53 +++++++++++++++++++++++++++++++++++++
> config/rootfiles/common/openvpn     |  5 +++-
> config/rootfiles/core/118/update.sh | 13 +++++++++
> html/cgi-bin/ovpnmain.cgi           |  3 ++-
> lfs/openvpn                         | 11 +++++---
> src/misc-progs/openvpnctrl.c        |  2 +-
> 6 files changed, 81 insertions(+), 6 deletions(-)
> create mode 100644 config/ovpn/ovpn_crl_updater.sh
> 
> diff --git a/config/ovpn/ovpn_crl_updater.sh b/config/ovpn/ovpn_crl_updater.sh
> new file mode 100644
> index 0000000..309edc2
> --- /dev/null
> +++ b/config/ovpn/ovpn_crl_updater.sh
> @@ -0,0 +1,53 @@
> +#!/bin/bash
> +
> +#
> +# Script Name: ovpn_crl_updater.sh
> +# Description: This script checks the "Next Update:" field of the CRL and renews it if needed,
> +#     which prevents the expiration of OpenVPNs CRL.
> +#     With OpenVPN 2.4.x the CRL handling has been refactored,
> +#     whereby the verification logic has been removed from ssl_verify_<backend>.c .
> +#     See for more infos:
> +#     https://github.com/OpenVPN/openvpn/commit/160504a2955c4478cd2c0323452929e07016a336
> +#
> +# Run Information: If OpenVPNs CRL is presant, 
> +#     this script provides a cronjob which checks daily if an update of the CRL is needed.
> +#     If the expiring date reaches the value (defined in the 'UPDATE' variable in days)
> +#     before the CRL expiration, an openssl command will be executed to renew the CRL.
> +#     The renewing of the CRL will be logged into /var/log/messages.
> +# 
> +# Author: Erik Kapfer
> +#
> +# Date: 17.01.2018
> +#
> +###############################################################################################
> +
> +# Check if OpenVPN is active or if the CRL is presant
> +if [ ! -e "/var/ipfire/ovpn/crls/cacrl.pem" ]; then
> +	exit 0;
> +fi
> +
> +## Paths
> +OVPN="/var/ipfire/ovpn";
> +CRL="${OVPN}/crls/cacrl.pem";
> +CAKEY="${OVPN}/ca/cakey.pem";
> +CACERT="${OVPN}/ca/cacert.pem";
> +OPENSSLCONF="${OVPN}/openssl/ovpn.cnf";
> +## Values
> +# CRL check for the the 'Next Update:' in seconds
> +EXPIRINGDATEINSEC="$(( $(date -d "$(openssl crl -in "${CRL}" -text | grep -oP 'Next Update: *\K.*')" +%s) - $(date +%s) ))";
> +# Day in seconds to calculate
> +DAYINSEC="86400";
> +# Convert seconds to days
> +NEXTUPDATE="$((EXPIRINGDATEINSEC / DAYINSEC))";
> +# Update of the CRL in days before CRL expiring date
> +UPDATE="2";
> +
> +# Check if OpenVPNs CRL needs to be renewed
> +if [ "${NEXTUPDATE}" -le "${UPDATE}" ]; then
> +	openssl ca -gencrl -keyfile "${CAKEY}" -cert "${CACERT}" -out "${CRL}" -config "${OPENSSLCONF}";
> +	logger -t openssl "OpenVPN CRL has been renewed";
> +fi
> +
> +exit 0
> +
> +# EOF
> diff --git a/config/rootfiles/common/openvpn b/config/rootfiles/common/openvpn
> index b58e30c..cbfd03e 100644
> --- a/config/rootfiles/common/openvpn
> +++ b/config/rootfiles/common/openvpn
> @@ -1,3 +1,5 @@
> +etc/fcron.daily/ovpn_crl_updater.sh
> +#usr/include/openvpn-msg.h
> #usr/include/openvpn-plugin.h
> #usr/lib/openvpn
> #usr/lib/openvpn/plugins
> @@ -10,11 +12,12 @@ usr/sbin/openvpn
> #usr/share/doc/openvpn
> #usr/share/doc/openvpn/COPYING
> #usr/share/doc/openvpn/COPYRIGHT.GPL
> +#usr/share/doc/openvpn/Changes.rst
> #usr/share/doc/openvpn/README
> #usr/share/doc/openvpn/README.IPv6
> #usr/share/doc/openvpn/README.auth-pam
> #usr/share/doc/openvpn/README.down-root
> -#usr/share/doc/openvpn/README.polarssl
> +#usr/share/doc/openvpn/README.mbedtls
> #usr/share/doc/openvpn/management-notes.txt
> #usr/share/man/man8/openvpn.8
> var/ipfire/ovpn/ca
> diff --git a/config/rootfiles/core/118/update.sh b/config/rootfiles/core/118/update.sh
> index 545c8ef..ea56832 100644
> --- a/config/rootfiles/core/118/update.sh
> +++ b/config/rootfiles/core/118/update.sh
> @@ -58,6 +58,19 @@ ldconfig
> /etc/init.d/apache restart
> /etc/init.d/snort start
> 
> +# Add changed and new OpenVPN-2.4 directives to server.conf and renew CRL
> +if [ -e /var/ipfire/ovpn/server.conf ]; then
> +    if pgrep openvpn >/dev/null; then
> +        openvpnctrl -k
> +        sed -i -e 's/script-security 3 system/script-security 3/' -e '/status .*/ a ncp-disable' /var/ipfire/ovpn/server.conf
> +        openssl ca -gencrl -keyfile /var/ipfire/ovpn/ca/cakey.pem -cert /var/ipfire/ovpn/ca/cacert.pem -out /var/ipfire/ovpn/crls/cacrl.pem -config /var/ipfire/ovpn/openssl/ovpn.cnf
> +        openvpnctrl -s
> +    else
> +        sed -i -e 's/script-security 3 system/script-security 3/' -e '/status .*/ a ncp-disable' /var/ipfire/ovpn/server.conf
> +        openssl ca -gencrl -keyfile /var/ipfire/ovpn/ca/cakey.pem -cert /var/ipfire/ovpn/ca/cacert.pem -out /var/ipfire/ovpn/crls/cacrl.pem -config /var/ipfire/ovpn/openssl/ovpn.cnf
> +    fi
> +fi
> +
> # This update need a reboot...
> touch /var/run/need_reboot
> 
> diff --git a/html/cgi-bin/ovpnmain.cgi b/html/cgi-bin/ovpnmain.cgi
> index 9f5e682..424a5c9 100644
> --- a/html/cgi-bin/ovpnmain.cgi
> +++ b/html/cgi-bin/ovpnmain.cgi
> @@ -216,7 +216,7 @@ sub writeserverconf {
>     print CONF "dev tun\n";
>     print CONF "proto $sovpnsettings{'DPROTOCOL'}\n";
>     print CONF "port $sovpnsettings{'DDEST_PORT'}\n";
> -    print CONF "script-security 3 system\n";
> +    print CONF "script-security 3\n";
>     print CONF "ifconfig-pool-persist /var/ipfire/ovpn/ovpn-leases.db 3600\n";
>     print CONF "client-config-dir /var/ipfire/ovpn/ccd\n";
>     print CONF "tls-server\n";
> @@ -289,6 +289,7 @@ sub writeserverconf {
>     }	
>     print CONF "status-version 1\n";
>     print CONF "status /var/run/ovpnserver.log 30\n";
> +    print CONF "ncp-disable\n";
>     print CONF "cipher $sovpnsettings{DCIPHER}\n";
>     if ($sovpnsettings{'DAUTH'} eq '') {
>         print CONF "";
> diff --git a/lfs/openvpn b/lfs/openvpn
> index 8307d01..e7f9bc2 100644
> --- a/lfs/openvpn
> +++ b/lfs/openvpn
> @@ -1,7 +1,7 @@
> ###############################################################################
> #                                                                             #
> # IPFire.org - A linux based firewall                                         #
> -# Copyright (C) 2017  IPFire Team  <info@ipfire.org>                          #
> +# Copyright (C) 2018  IPFire Team  <info@ipfire.org>                          #
> #                                                                             #
> # This program is free software: you can redistribute it and/or modify        #
> # it under the terms of the GNU General Public License as published by        #
> @@ -24,7 +24,7 @@
> 
> include Config
> 
> -VER        = 2.3.18
> +VER        = 2.4.4
> 
> THISAPP    = openvpn-$(VER)
> DL_FILE    = $(THISAPP).tar.xz
> @@ -40,7 +40,7 @@ objects = $(DL_FILE)
> 
> $(DL_FILE) = $(DL_FROM)/$(DL_FILE)
> 
> -$(DL_FILE)_MD5 = 844ec9c64aae62051478784b8562f881
> +$(DL_FILE)_MD5 = 7a2002aad1671b24457bc9432a0c5c52
> 
> install : $(TARGET)
> 
> @@ -96,5 +96,10 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
> 	mv -v /var/ipfire/ovpn/verify /usr/lib/openvpn/verify
> 	chown root:root /usr/lib/openvpn/verify
> 	chmod 755 /usr/lib/openvpn/verify
> +	mv -v /var/ipfire/ovpn/ovpn_crl_updater.sh /etc/fcron.daily
> +	chown root:root /etc/fcron.daily/ovpn_crl_updater.sh
> +	chmod 750 /etc/fcron.daily/ovpn_crl_updater.sh
> +
> 	@rm -rf $(DIR_APP)
> 	@$(POSTBUILD)
> +
> diff --git a/src/misc-progs/openvpnctrl.c b/src/misc-progs/openvpnctrl.c
> index 20967e4..39e8f58 100644
> --- a/src/misc-progs/openvpnctrl.c
> +++ b/src/misc-progs/openvpnctrl.c
> @@ -485,7 +485,7 @@ void startDaemon(void) {
> 		executeCommand(command);
> 		snprintf(command, STRING_SIZE-1, "/bin/chown root.nobody /var/run/ovpnserver.log");
> 		executeCommand(command);
> -		snprintf(command, STRING_SIZE-1, "/bin/chmod 644 /var/run/ovpnserver.log");
> +		snprintf(command, STRING_SIZE-1, "/bin/chmod 664 /var/run/ovpnserver.log");
> 		executeCommand(command);
> 	}
> }
> -- 
> 2.7.4
>