Subversion Repositories configs

# Fail2Ban filter for openssh

#

# If you want to protect OpenSSH from being bruteforced by password

# authentication then get public key authentication working before disabling

# PasswordAuthentication in sshd_config.

#

#

# "Connection from <HOST> port \d+" requires LogLevel VERBOSE in sshd_config

#

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from

# common.local

before = common.conf

[DEFAULT]

_daemon = sshd

# optional prefix (logged from several ssh versions) like "error: ", "error: PAM: " or "fatal: "

__pref = (?:(?:error|fatal): (?:PAM: )?)?

# optional suffix (logged from several ssh versions) like " [preauth]"

#__suff = (?: port \d+)?(?: \[preauth\])?\s*

__suff = (?: (?:port \d+|on \S+|\[preauth\])){0,3}\s*

__on_port_opt = (?: (?:port \d+|on \S+)){0,2}

# close by authenticating user:

__authng_user = (?: (?:invalid|authenticating) user <F-USER>\S+|.*?</F-USER>)?

# for all possible (also future) forms of "no matching (cipher|mac|MAC|compression method|key exchange method|host key type) found",

# see ssherr.c for all possible SSH_ERR_..._ALG_MATCH errors.

__alg_match = (?:(?:\w+ (?!found\b)){0,2}\w+)

# PAM authentication mechanism, can be overridden, e. g. `filter = sshd[__pam_auth='pam_ldap']`:

__pam_auth = pam_[a-z]+

[Definition]

prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID>%(__pref)s<F-CONTENT>.+</F-CONTENT>$

cmnfailre = ^[aA]uthentication (?:failure|error|failed) for <F-USER>.*</F-USER> from <HOST>( via \S+)?%(__suff)s$

            ^User not known to the underlying authentication module for <F-USER>.*</F-USER> from <HOST>%(__suff)s$

            <cmnfailre-failed-pub-<publickey>>

            ^Failed <cmnfailed> for (?P<cond_inv>invalid user )?<F-USER>(?P<cond_user>\S+)|(?(cond_inv)(?:(?! from ).)*?|[^:]+)</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)

            ^<F-USER>ROOT</F-USER> LOGIN REFUSED FROM <HOST>

            ^[iI](?:llegal|nvalid) user <F-USER>.*?</F-USER> from <HOST>%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> from <HOST> not allowed because not listed in AllowUsers%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> from <HOST> not allowed because listed in DenyUsers%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> from <HOST> not allowed because not in any group%(__suff)s$

            ^refused connect from \S+ \(<HOST>\)

            ^Received <F-MLFFORGET>disconnect</F-MLFFORGET> from <HOST>%(__on_port_opt)s:\s*3: .*: Auth fail%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> from <HOST> not allowed because a group is listed in DenyGroups%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> from <HOST> not allowed because none of user's groups are listed in AllowGroups%(__suff)s$

            ^<F-NOFAIL>%(__pam_auth)s\(sshd:auth\):\s+authentication failure;</F-NOFAIL>(?:\s+(?:(?:logname|e?uid|tty)=\S*)){0,4}\s+ruser=<F-ALT_USER>\S*</F-ALT_USER>\s+rhost=<HOST>(?:\s+user=<F-USER>\S*</F-USER>)?%(__suff)s$

            ^maximum authentication attempts exceeded for <F-USER>.*</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?%(__suff)s$

            ^User <F-USER>\S+|.*?</F-USER> not allowed because account is locked%(__suff)s

            ^<F-MLFFORGET>Disconnecting</F-MLFFORGET>(?: from)?(?: (?:invalid|authenticating)) user <F-USER>\S+</F-USER> <HOST>%(__on_port_opt)s:\s*Change of username or service not allowed:\s*.*\[preauth\]\s*$

            ^Disconnecting: Too many authentication failures(?: for <F-USER>\S+|.*?</F-USER>)?%(__suff)s$

            ^<F-NOFAIL>Received <F-MLFFORGET>disconnect</F-MLFFORGET></F-NOFAIL> from <HOST>%(__on_port_opt)s:\s*11:

            <mdre-<mode>-other>

            ^<F-MLFFORGET><F-MLFGAINED>Accepted \w+</F-MLFGAINED></F-MLFFORGET> for <F-USER>\S+</F-USER> from <HOST>(?:\s|$)

cmnfailed-any = \S+

cmnfailed-ignore = \b(?!publickey)\S+

cmnfailed-invalid = <cmnfailed-ignore>

cmnfailed-nofail = (?:<F-NOFAIL>publickey</F-NOFAIL>|\S+)

cmnfailed = <cmnfailed-<publickey>>

mdre-normal =

# used to differentiate "connection closed" with and without `[preauth]` (fail/nofail cases in ddos mode)

mdre-normal-other = ^<F-NOFAIL><F-MLFFORGET>(Connection closed|Disconnected)</F-MLFFORGET></F-NOFAIL> (?:by|from)%(__authng_user)s <HOST>(?:%(__suff)s|\s*)$

mdre-ddos = ^Did not receive identification string from <HOST>

            ^kex_exchange_identification: (?:[Cc]lient sent invalid protocol identifier|[Cc]onnection closed by remote host)

            ^Bad protocol version identification '.*' from <HOST>

            ^<F-NOFAIL>SSH: Server;Ltype:</F-NOFAIL> (?:Authname|Version|Kex);Remote: <HOST>-\d+;[A-Z]\w+:

            ^Read from socket failed: Connection <F-MLFFORGET>reset</F-MLFFORGET> by peer

# same as mdre-normal-other, but as failure (without <F-NOFAIL>) and [preauth] only:

mdre-ddos-other = ^<F-MLFFORGET>(Connection (?:closed|reset)|Disconnected)</F-MLFFORGET> (?:by|from)%(__authng_user)s <HOST>%(__on_port_opt)s\s+\[preauth\]\s*$

mdre-extra = ^Received <F-MLFFORGET>disconnect</F-MLFFORGET> from <HOST>%(__on_port_opt)s:\s*14: No(?: supported)? authentication methods available

            ^Unable to negotiate with <HOST>%(__on_port_opt)s: no matching <__alg_match> found.

            ^Unable to negotiate a <__alg_match>

            ^no matching <__alg_match> found:

# part of mdre-ddos-other, but user name is supplied (invalid/authenticating) on [preauth] phase only:

mdre-extra-other = ^<F-MLFFORGET>Disconnected</F-MLFFORGET>(?: from)?(?: (?:invalid|authenticating)) user <F-USER>\S+|.*?</F-USER> <HOST>%(__on_port_opt)s \[preauth\]\s*$

mdre-aggressive = %(mdre-ddos)s

                  %(mdre-extra)s

# mdre-extra-other is fully included within mdre-ddos-other:

mdre-aggressive-other = %(mdre-ddos-other)s

# Parameter "publickey": nofail (default), invalid, any, ignore

publickey = nofail

# consider failed publickey for invalid users only:

cmnfailre-failed-pub-invalid = ^Failed publickey for invalid user <F-USER>(?P<cond_user>\S+)|(?:(?! from ).)*?</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)

# consider failed publickey for valid users too (don't need RE, see cmnfailed):

cmnfailre-failed-pub-any =

# same as invalid, but consider failed publickey for valid users too, just as no failure (helper to get IP and user-name only, see cmnfailed):

cmnfailre-failed-pub-nofail = <cmnfailre-failed-pub-invalid>

# don't consider failed publickey as failures (don't need RE, see cmnfailed):

cmnfailre-failed-pub-ignore =

cfooterre = ^<F-NOFAIL>Connection from</F-NOFAIL> <HOST>

failregex = %(cmnfailre)s

            <mdre-<mode>>

            %(cfooterre)s

# Parameter "mode": normal (default), ddos, extra or aggressive (combines all)

# Usage example (for jail.local):

#   [sshd]

#   mode = extra

#   # or another jail (rewrite filter parameters of jail):

#   [sshd-aggressive]

#   filter = sshd[mode=aggressive]

#

mode = normal

#filter = sshd[mode=aggressive]

ignoreregex =

maxlines = 1

journalmatch = _SYSTEMD_UNIT=sshd.service + _COMM=sshd

# DEV Notes:

#

#   "Failed \S+ for .*? from <HOST>..." failregex uses non-greedy catch-all because

#   it is coming before use of <HOST> which is not hard-anchored at the end as well,

#   and later catch-all's could contain user-provided input, which need to be greedily

#   matched away first.

#

# Author: Cyril Jaquier, Yaroslav Halchenko, Petr Voralek, Daniel Black and Sergey Brester aka sebres

# Rewritten using prefregex (and introduced "mode" parameter) by Serg G. Brester.