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2013-09-26build: add --disable-cthelper and --disable-cttimeoutPablo Neira Ayuso
This patch allows you to disable userspace helper support and conntrack timeout tuning at build stage. By default, both features are enabled, to avoid breaking backward compatibility. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2013-08-06conntrack-tools 1.4.2 releasePablo Neira Ayuso
bump dependency with libnetfilter_conntrack to 1.0.4, otherwise we don't get the connlabel support. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2013-03-04build: requires libnetfilter_conntrack >= 1.0.3Pablo Neira Ayuso
Reported-by: Gustavo Zacarias <gustavo@zacarias.com.ar> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2013-03-03build: bump version to 1.4.1Pablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-10-08bump version to 1.4.0 and update dependenciesPablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-08-01nfct: helper: use CONNTRACKD_LIB_DIR variable set during configurationPablo Neira Ayuso
Instead of hardcoded path to /usr/lib/conntrack-tools/ which might not be true if options like --prefix with different location is passed to conntrack. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-08-01conntrackd: add cthelper infrastructure (+ example FTP helper)Pablo Neira Ayuso
This patch adds the user-space helper infrastructure. It also contains the implementation of the FTP helper in user-space. There's one example file that you can use to configure conntrackd as user-space connection tracking helper under: doc/helper/conntrackd.conf Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-07-31bump version to 1.2.2Pablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-05-26bump version to 1.2.1Pablo Neira Ayuso
this release fixes a compilation issue in 1.2.0, sorry. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-05-26build: update dependencies with libnetfilter_conntrack (>= 1.0.1)Pablo Neira Ayuso
libnetfilter_conntrack 1.0.1 includes important updates for the expectation side, which is used in this major milestone release. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-05-26build: bump version to 1.2.0Pablo Neira Ayuso
Major milestone including the new `nfct' utility and the expectation support for conntrackd. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-05-26src: integrate nfct into the conntrack-tools treePablo Neira Ayuso
I'll need for the upcoming cthelper infrastructure. Moreover, we avoid more fragmentation in the netfilter user-space utilities. And the plan is that `nfct' will replace `conntrack' at some point. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-01-10conntrackd: support for expectation synchronizationPablo Neira Ayuso
This patch adds support to synchronize expectations between firewalls. This addition aims to re-use as much as possible of the existing infrastructure for stability reasons. The expectation support has been tested with the FTP helper. This extension requires libnetfilter_conntrack 1.0.0. If this is the first time you're playing with conntrackd, I *strongly* recommend you to get working setup of conntrackd without expectation support before as described in the documentation. Then, enabling expectation support is rather easy. To know more about expectations, if you're not familiar with them, I suggest you to read: "Netfilter's Connection Tracking System" http://people.netfilter.org/pablo/docs/login.pdf Reprinted from ;login: The Magazine of USENIX, vol. 31, no. 3 (Berkeley, CA: USENIX Association, 2006, pp40-45.) In short, expectations allow one Linux firewall to filter multi-flow traffic like FTP, SIP and H.323. In my testbed, there are two firewalls in a primary-backup configuration running keepalived. The use a couple of floating cluster IP address (192.168.0.100 and 192.168.1.100) that are used by the client. These firewalls protect one FTP server (192.168.1.2) that will be accessed by one client. In ASCII art, it looks like this: 192.168.0.100 192.168.1.100 eth1 eth2 fw-1 / \ FTP -- client ------ ------ server -- 192.168.0.2 \ / 192.168.1.2 fw-2 This is the rule-set for the firewalls: -A POSTROUTING -t nat -s 192.168.0.2/32 -d 192.168.1.2/32 -j SNAT --to-source 192.168.1.100 -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -m state --state INVALID -j DROP -A FORWARD -m state --state RELATED -j ACCEPT -A FORWARD -i eth2 -m state --state ESTABLISHED -j ACCEPT -A FORWARD -i eth1 -p tcp -m tcp --dport 21 --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT -A FORWARD -i eth1 -p tcp -m state --state ESTABLISHED -j ACCEPT -A FORWARD -m state --state INVALID -j LOG --log-prefix "invalid: " The following steps detail how to check that the expectation support works fine for conntrackd: 1) You have to enable the expectation support in the configuration file with the following option: Sync { ... Options { ExpectationSync { ftp sip h323 } } } This enables expectation synchronization for the FTP, SIP and H.323 helpers. You can alternatively use: Sync { ... Options { ExpectationSync On } } To enable expectation synchronization for all helpers. 2) Make sure you have loaded the FTP helper in both firewalls. root@fw1# modprobe nf_conntrack_ftp root@fw2# modprobe nf_conntrack_ftp 3) Switch to the client. Start one FTP control connection to one server that is protected by the firewalls, enter passive mode: (term-1) user@client$ nc 192.168.1.2 21 220 dummy FTP server USER anonymous 331 Please specify the password. PASS nothing 230 Login successful. PASV 227 Entering Passive Mode (192,168,1,2,163,11). This means that port 163*256+11=41739 will be used for the data traffic. Read this if you are not familiar with the FTP protocol: http://www.freefire.org/articles/ftpexample.php 3) Switch to fw-1 (primary) to check that the expectation is in the internal cache. root@fw1# conntrackd -i exp proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 5s] 4) Switch to fw-2 (backup) to check that the expectation has been successfully replicated. root@fw2# conntrackd -e exp proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 8s] 5) Make the primary firewall fw-1 fail. Now fw-2 becomes primary. 6) Switch to fw-2 (primary) to commit the external cache into the kernel. root@fw2# conntrackd -c exp The logs should display that the commit was successful: root@fw2# tail -100f /var/log/conntrackd.log [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] committing external cache: expectations [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] Committed 1 new entries [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] commit has taken 0.000366 seconds 7) Switch to the client. Open a new terminal and connect to the port that has been announced by the server: (term-2) user@client$ nc -vvv 192.168.1.2 41739 (UNKNOWN) [192.168.1.2] 41739 (?) open 8) Switch to term-1 and ask for the file listing: [...] 227 Entering Passive Mode (192,168,1,2,163,11). LIST 9) Switch to term-2, it should display the listing. That means everything has worked fine. You may want to try disabling the expectation support and repeating the steps to check that *it does not work* without the state-synchronization. You can also display expectation statistics by means of: root@fwX# conntrackd -s exp This update requires no changes in the primary-backup.sh script that is used by the HA manager to interact with conntrackd. Thus, we provide a backward compatible command line interface. Regarding the Filter clause and expectations, we use the master conntrack to filter expectation events. The filtering is performed in user-space. No kernel-space filtering support for expectations yet (this support should go in libnetfilter_conntrack at some point). This patch also includes support to disable caching and to allow direct injection of expectations. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-01-04build: bump version to 1.0.1conntrack-tools-1.0.1Pablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-12-17build: disable implicit .tar.gz archive generation and use POSIX modeJan Engelhardt
2011-12-17build: use AC_CONFIG_AUX_DIR and stash away toolsJan Engelhardt
2011-03-15build: Linux kernel-style for compilation messagesPablo Neira Ayuso
[...] CC external_inject.o CC internal_cache.o CC internal_bypass.o CC read_config_yy.o CC read_config_lex.o CCLD conntrackd Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-02-27build: bump version to 1.0.0conntrack-tools-1.0.0Pablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-02-24build: conntrack-tools now requires libnetfilter_conntrack >= 0.9.1Pablo Neira Ayuso
The existing code requires new features that went into the current library version. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2010-11-05build: remove redundant bison/lex testsJan Engelhardt
AC_PROG_{LEX,YACC} already searches for the programs, so no need to do it again with AC_CHECK_PROGS. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-11-05build: run autoupdate to replace obsolete constructsJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-11-05build: default to not building static librariesJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-10-31build: no need for error message in PKG_CHECK_MODULESJan Engelhardt
PKG_CHECK_MODULES already produces its own (and more verbose) messsage when a module cannot be found. Mucking around with CFLAGS and LIBS is also not needed since pkgconfig takes care of providing variables, so let's use them in Makefile.am. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-10-31build: remove statements without effectJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-10-31build: use modern call syntax for AM_INIT_AUTOMAKEJan Engelhardt
automake options also need to definitely go into configure.ac, otherwise they only apply to a single directory. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-10-31build: use autoconf-suggested naming of filesJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
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