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118 lines
4.2 KiB
118 lines
4.2 KiB
fail2ban for Debian
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-------------------
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This package is ~95% identical to the upstream version. Few features
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could have been added but not yet propagated into upstream version and
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some modifications might be Debian-specific (logsys logging
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format). And although due to tight collaboration with upstream author
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most of the Debian modifications penetrate into the next upstream, few
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features present in Debian release were rejected by the upstream
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author (-e option for instance).
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Currently, the major difference with upstream: python libraries are
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placed under /usr/share/fail2ban instead of /usr/lib/fail2ban to
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comply with policy regarding architecture independent resources.
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Also the main config file /etc/fail2ban.conf is a copy of
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/usr/share/doc/examples/fail2ban.conf.iptables. There are config files
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for banning via shorewall or hosts.deny are provided BUT they might
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miss additional sections present in fail2ban.conf. Please copy them
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taking care about added sections. Those files will be obsolete in the
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next release which would handle split configuration files.
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Default behavior:
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-----------------
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Only handling of ssh files is enabled by default. If you want to use
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fail2ban with apache, please enable apache section manually in
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/etc/fail2ban.conf or enable section using command line parameter -e
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in /etc/default/fail2ban to avoid conflicts during upgrade of the
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config file.
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N.B. '-e' command line parameter is present solely in Debian release
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of fail2ban, thus it will not work if you decided to proceed with
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vanilla upstream.
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Troubleshooting:
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---------------
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* Updated failregex:
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To resolve the security bug #330827 [1] failregex expressions must
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provide a named group (?P<host>...) as a placeholder of the abuser's
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host. The naming of the group was introduced to capture possible
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future generalizations of failregex to provide even more
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information. At a current point, all named groups are considered as
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possible locations of the host addresses, but usually you should need
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just a single group (?P<host>...)
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[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=330827
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* "Interpolations" in the config file:
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Since version 0.6.0-3 to reduce duplication, thus to improve
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readability of the config file, interpolations provided by the module
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ConfigParser are used. If you had custom sections defined before, you
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might benefit from updating config file and adding appropriate
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information for the new sections.
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N.B. If you have some nice additional sections defined, I would really
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appreciate if you share them with me, so they could be eventually
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included in the fail2ban package for general use by the rest of the
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community.
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* Mailing:
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As it was reported (bug #329722) you might need to provide a full
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e-mail address in fail2ban.conf option MAIL:from to make your mail
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server accept that email. I've added @localhost to both MAIL:from and
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MAIL:to in the default configuration shipped with Debian. It seems to
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work nicely now
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See TODO.Debian for more details, as well as the Debian Bug Tracking
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system.
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* Dirty exit:
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If firewall rules gets cleaned out before fail2ban exits (like was
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happening with firestarter), errors get reported during the exit of
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fail2ban, but they are "safe" and can be ignored.
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** SSHD Configuration Specific Problems
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* Ban "Not allowed" attempts:
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Make sure that you have
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ChallengeResponseAuthentication no
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PasswordAuthentication yes
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Details from the bug report #350980 [2]
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[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=350980
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* Not caught attempts to login as root
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On the boxes running older versions of openssh (e.g. sarge
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distribution) in the case when PermitRootLogin is set to something
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else than "yes" and iff AllowUsers is active, failed root logins do
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not confirm to the standard logging message -- they omit the source
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IP, thus allowing attack to persist since such messages are not caught
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by fail2ban.
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* Bantime:
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An IP is banned for "bantime" not since the last failed login attempt
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from the IP, but rather since the moment when failed login was
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detected by fail2ban. Thus, if fail2ban gets [re]started, any IP which
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had enough of failed logins within "findtime" will be banned for
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"bantime" since [re]start moment, not since the last failed login
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time.
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-- Yaroslav O. Halchenko <debian@onerussian.com>, Sun, 19 Mar 2006 00:27:22 -0500
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