Hi,
Apologies for the late reply again… I am trying to catch up on my rather large inbox.
On 26 Apr 2019, at 05:55, ummeegge ummeegge@ipfire.org wrote:
Hi Michael and thanks for looking into this.
On Mi, 2019-04-24 at 12:04 +0100, Michael Tremer wrote:
Hi,
Thanks for working on this. I have a couple of questions and remarks.
On 23 Apr 2019, at 08:06, Erik Kapfer ummeegge@ipfire.org wrote:
- Added USELIBCAP=1 to enable the possibility for transparent
option.
- Wrote configuration directives in initscript into variable for
better overview.
- Introduce chroot directive in start parameter.
- Added new user and group sslh (will be deleted if uninstall).
- Changed EXTERNAL_IP_FUNCT to serve data also for configuration
block but use it also as check as before.
- Added symlinks in sslh paks since the initscripts LFS do not
serves it in old installation (a reboot does not started sslh again).
- Deleted sslh symlinks in initscripts LFS since they are served
via sslh paks and are not needed anymore.
Signed-off-by: Erik Kapfer ummeegge@ipfire.org
lfs/initscripts | 3 -- lfs/sslh | 12 ++++---- src/initscripts/packages/sslh | 65 +++++++++++++++++++++++++++++++++---------- src/paks/sslh/install.sh | 13 +++++++++ src/paks/sslh/uninstall.sh | 9 ++++++ 5 files changed, 79 insertions(+), 23 deletions(-)
diff --git a/lfs/initscripts b/lfs/initscripts index 055e106d0..3173a04e4 100644 --- a/lfs/initscripts +++ b/lfs/initscripts @@ -136,9 +136,6 @@ $(TARGET) : ln -sf ../init.d/client175 /etc/rc.d/rc0.d/K34client175 ln -sf ../init.d/client175 /etc/rc.d/rc3.d/S66client175 ln -sf ../init.d/client175 /etc/rc.d/rc6.d/K34client175
- ln -sf ../init.d/sslh /etc/rc.d/rc3.d/S98sslh
- ln -sf ../init.d/sslh /etc/rc.d/rc0.d/K02sslh
- ln -sf ../init.d/sslh /etc/rc.d/rc6.d/K02sslh ln -sf ../init.d/vdradmin /etc/rc.d/rc3.d/S99vdradmin ln -sf ../init.d/vdradmin /etc/rc.d/rc0.d/K01vdradmin ln -sf ../init.d/vdradmin /etc/rc.d/rc6.d/K01vdradmin
diff --git a/lfs/sslh b/lfs/sslh index 100cec065..dedd10272 100644 --- a/lfs/sslh +++ b/lfs/sslh @@ -1,7 +1,7 @@ ################################################################### ############ # # # IPFire.org - A linux based firewall # -# Copyright (C) 2007-2018 IPFire Team info@ipfire.org # +# Copyright (C) 2007-2019 IPFire Team info@ipfire.org # # # # This program is free software: you can redistribute it and/or modify # # it under the terms of the GNU General Public License as published by # @@ -24,7 +24,7 @@
include Config
-VER = 1.7a +VER = 1.20
THISAPP = sslh-$(VER) DL_FILE = $(THISAPP).tar.gz @@ -32,7 +32,7 @@ DL_FROM = $(URL_IPFIRE) DIR_APP = $(DIR_SRC)/$(THISAPP) TARGET = $(DIR_INFO)/$(THISAPP) PROG = sslh -PAK_VER = 5 +PAK_VER = 6
DEPS = ""
@@ -44,7 +44,7 @@ objects = $(DL_FILE)
$(DL_FILE) = $(DL_FROM)/$(DL_FILE)
-$(DL_FILE)_MD5 = ee124654412198a5e11fe28acf10634d +$(DL_FILE)_MD5 = 0db26ed2825b1ef6c83959a988279912
install : $(TARGET)
@@ -77,8 +77,8 @@ $(subst %,%_MD5,$(objects)) : $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects)) @$(PREBUILD) @rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
- cd $(DIR_APP) && make CFLAGS="$(CFLAGS)" $(MAKETUNING)
USELIBWRAP=
- cd $(DIR_APP) && install -v -m 755 sslh /usr/sbin
- cd $(DIR_APP) && make CFLAGS="$(CFLAGS)" $(MAKETUNING)
USELIBCAP=1 USELIBWRAP=
cd $(DIR_APP) && install -v -m 755 sslh-fork /usr/sbin/sslh
#install initscripts $(call INSTALL_INITSCRIPT,sslh)
It looks all fine up to this point.
diff --git a/src/initscripts/packages/sslh b/src/initscripts/packages/sslh index 43e58f392..0935b1114 100644 --- a/src/initscripts/packages/sslh +++ b/src/initscripts/packages/sslh @@ -3,31 +3,68 @@
# Based on sysklogd script from LFS-3.1 and earlier. # Rewritten by Gerard Beekmans - gerard@linuxfromscratch.org +# +# $LastChangedBy: ummeegge - ummeegge@ipfire.org $ +# $Date: 2019-04-04 04:35:09 -0500 (Thu, 04 Apr 2019) $ +# +############################################################# +#
You do not need to include authorship headers because Git will take care of this.
Done.
. /etc/sysconfig/rc . $rc_functions
+DAEMON="/usr/sbin/sslh"
+# Check for external IP address and provide it to listening option +EXTERNAL_IP_ADDRESS="$(</var/ipfire/red/local-ipaddress)" +EXTERNAL_IP_FUNCT() {
if [ -z "${EXTERNAL_IP_ADDRESS}" ]; thenecho_failureboot_mesg -n "FAILURE:\n\nCould not determine"${FAILURE}
boot_mesg -n " your external IP address."boot_mesg "" ${NORMAL}exit 1fi+}
Although you are starting the service rather late in the boot process, it might indeed happen that this goes wrong. How do we recover from this? The service should be started eventually when RED comes up.
I tried to leave the most options pretty much the same as they where before whereby the numbers of the symlinks are a part of this the testings did not delivered problems with this but better to stay save there. The network initscript starts at 'S20' where i think RED will be started too what you think is a good starting point for sslh ?
If there is a cable plugged into RED and it actually comes up this is a good time to start the service. But what if the DSL modem takes longer to sync or so? It should still be started in red.up then.
What if the IP address on RED changes? How is sslh notified?
I think it won´t currently. Have seen some configurations which uses 0.0.0.0 for the --listen option but this can cause bigger troubles if '443' is the --listen port here i think. As far as i can see only a restart of sslh would fix this currently. May you have an idea here ?
Have a script in red.up which restarts the whole service - but only if the IP address has actually changed so that standing connections won’t be interrupted. I think that is what we need here, isn’t it?
+# Loopback interface +LO="127.0.0.1" +# Used TCP ports +LISTENPORT="443" +SSHPORT="222" +TLSPORT="444" +OPENVPNPORT=“1194"
Can we use hard-coded port numbers here?
Here arises also some more questions for me. We can grep for them in the configuration files but also may a check for the correct usage can be made since e.g. OpenVPN needs to run with TCP for example.
I would say that 443 probably masks traffic best and is most likely to be open even in more restricted environments.
OpenVPN has to be running in TCP mode, but that is something the user has to configure. It isn’t even certain if they are using OpenVPN here. So that should be optional.
Should we really provide TCP 444 in here for external access ? I think also SSH might be more secure via VPN but may a little more acceptable if no VPN is in usage?!
The Web UI? No, that should not be open by default. People should use OpenVPN to access the firewall.
The main topic in the tests we made in the forum where mainly for LAN instances on seperated machines (mostly webservers) where those questions may be not that critical?!
We do not know how critical the application of the user is. So assuming it is most critical is best.
+# Configuration options +DAEMON_OPTS=" +--user sslh +--listen ${EXTERNAL_IP_ADDRESS}:${LISTENPORT} +--ssh ${LO}:${SSHPORT} +--tls ${LO}:${TLSPORT} +--openvpn ${LO}:${OPENVPNPORT} +--pidfile /var/run/sslh.pid +-C /var/empty +"
+# Check for binary +if ! [ -x "$(command -v ${DAEMON})" ]; then
- echo "Error: could not find ${DAEMON}" >&2
- exit 1
+fi
No need for this check really. We don’t have it anywhere else.
Done.
+# Check for external IP +EXTERNAL_IP_FUNCT
This does not really need to be a function because the if statement above isn’t either.
And it should not be evaluated in the stop case. If the system is not online, this service can never be stopped.
I think it is best for this code to have it in the start section where is was before - unless I missed something here.
Have externalised the investigation of the RED address to provide it also for the --listen option in the configuration block. To keep the start) case also a little cleaner have decided to set the external IP check completely outside of the start) case and set the check before but this is fast changed.
You won’t be able to stop the service then if the script is ended in that block.
I think it should only be evaluated in the start block. The check isn’t needed for stopping the service.
case "$1" in start) boot_mesg "Starting SSLH Deamon..."
LOCAL_IP_ADDRESS="$(</var/ipfire/red/local-ipaddress)"if [ -z "${LOCAL_IP_ADDRESS}" ]; thenecho_failureboot_mesg -n "FAILURE:\n\nCould not determine"${FAILURE}
boot_mesg -n " your external IP address."boot_mesg "" ${NORMAL}exit 1filoadproc /usr/sbin/sslh -u nobody \-p "${LOCAL_IP_ADDRESS}:443" -s localhost:222-l localhost:444
loadproc ${DAEMON} ${DAEMON_OPTS}evaluate_retval ;;
stop) boot_mesg "Stopping SSLH Deamon..."
killproc /usr/sbin/sslh
killproc ${DAEMON}@@ -38,7 +75,7 @@ case "$1" in ;;
status)
statusproc /usr/sbin/sslh
statusproc ${DAEMON};;
*)
diff --git a/src/paks/sslh/install.sh b/src/paks/sslh/install.sh index 626884bdd..df7cafc78 100644 --- a/src/paks/sslh/install.sh +++ b/src/paks/sslh/install.sh @@ -23,5 +23,18 @@ # . /opt/pakfire/lib/functions.sh extract_files
+# Add user and group for sslh if not already done +if ! grep -q sslh /etc/passwd; then
- groupadd sslh;
- useradd -g sslh -M -s /sbin/nologin sslh
+fi
Can you change this to use getent? There are a couple of examples in some other scripts (e.g. tor).
Done.
You should also check if the group existed already.
I think the getent solution --> if ! getent group sslh &>/dev/null; then ... will do this.
OK!
ln -s /etc/init.d/sslh /etc/rc.d/init.d/networking/red.up/50-sslh
Why is this link not in the package?
You mean in the LFS ? This is also a part of the old implementation, might it be an idea to have it in the initscript (incl. deletion of the symlink) ?
I think it is easiest to have it in the package so it will be deleted when the package is being removed.
This might become a script now - see above.
Should we not check if the service is running and only then restart?
Via pgrep check in start) ?
Not in start, but in the red.up script.
That way we would only touch the service when it is active. If it isn’t started, we need to figure out if it should be started - or check if the boot process brought it up - even though RED wasn’t up.
What happens when the service is disabled at boot time?
You mean disabled via WUI ?
Yes.
+# Set symlink for runlevels +ln -svf ../init.d/sslh /etc/rc.d/rc0.d/K02sslh +ln -svf ../init.d/sslh /etc/rc.d/rc3.d/S98sslh +ln -svf ../init.d/sslh /etc/rc.d/rc6.d/K02sslh
start_service --background ${NAME} diff --git a/src/paks/sslh/uninstall.sh b/src/paks/sslh/uninstall.sh index dca34ccbd..05bb27945 100644 --- a/src/paks/sslh/uninstall.sh +++ b/src/paks/sslh/uninstall.sh @@ -23,5 +23,14 @@ # . /opt/pakfire/lib/functions.sh stop_service ${NAME}
+# Delete user and group sslh +if grep -q sslh /etc/passwd; then
- userdel sslh
- groupdel sslh
+fi
We don’t delete users. This will cause that log files or so will have no owner any more.
This won’t be an issue because we check if the user exists in the install script and if it does we are not trying to create it any more.
Done.
Thanks!
remove_files rm -f /etc/rc.d/init.d/networking/red.up/50-sslh +# Delete initscript symlinks
+rm -f /etc/rc.d/rc?.d/???sslh
2.12.2
Overall this looks good and makes this a better add-on. It looks like many things to change, but they are all small and should not take too long.
This Addon is really a old one and i was not sure if it should be updated again or if it would be dropped since stunnel do a similar job i think. But am happy if it can be a better one and the time to bring it back to life was not wasted.
If you are using it, it should of course be updated.
There is a little bit of work to be done and some add-ons are really just the package itself with little integration, but I think it is a good idea to make high-quality add-on out of this.
Maybe we should have awesome documentation on the Wiki so that more people are aware of it and therefore use it.
-Michael
Best, -Michael
Best,
Erik