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amend with better match of optional suffix-groups;

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remove end-anchors for expressions are precise enough (with clear flow, simple branches, without catch-all's, etc.);
pull/2090/head
sebres 7 years ago
parent 66d2436f21
commit 8028d3940d
2 changed files with 26 additions and 25 deletions
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35
config/filter.d/sshd.conf
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@ -21,8 +21,9 @@ _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*
__on_port_opt = (?: port \d+)?(?: on \S+(?: port \d+)?)?
#__suff = (?: port \d+)?(?: \[preauth\])?\s*
__suff = (?: (?:port \d+|on \S+|\[preauth\])){0,3}\s*
__on_port_opt = (?: (?:port \d+|on \S+)){0,2}
# 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.
@ -32,19 +33,19 @@ __alg_match = (?:(?:\w+ (?!found\b)){0,2}\w+)
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+)?\s*%(__suff)s$
^User not known to the underlying authentication module for <F-USER>.*</F-USER> from <HOST>\s*%(__suff)s$
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$
^Failed \S+ for invalid user <F-USER>(?P<cond_user>\S+)|(?:(?! from ).)*?</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)
^Failed \b(?!publickey)\S+ for (?P<cond_inv>invalid user )?<F-USER>(?P<cond_user>\S+)|(?(cond_inv)(?:(?! from ).)*?|[^:]+)</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)
^<F-USER>ROOT</F-USER> LOGIN REFUSED FROM <HOST>\s*%(__suff)s$
^[iI](?:llegal|nvalid) user <F-USER>.*?</F-USER> from <HOST>%(__on_port_opt)s\s*$
^User <F-USER>.+</F-USER> from <HOST> not allowed because not listed in AllowUsers\s*%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because listed in DenyUsers\s*%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because not in any group\s*%(__suff)s$
^refused connect from \S+ \(<HOST>\)\s*%(__suff)s$
^<F-USER>ROOT</F-USER> LOGIN REFUSED FROM <HOST>%(__suff)s$
^[iI](?:llegal|nvalid) user <F-USER>.*?</F-USER> from <HOST>%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because not listed in AllowUsers%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because listed in DenyUsers%(__suff)s$
^User <F-USER>.+</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>.+</F-USER> from <HOST> not allowed because a group is listed in DenyGroups\s*%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because a group is listed in DenyGroups%(__suff)s$
^User <F-USER>.+</F-USER> from <HOST> not allowed because none of user's groups are listed in AllowGroups%(__suff)s$
^pam_unix\(sshd:auth\):\s+authentication failure;\s*logname=\S*\s*uid=\d*\s*euid=\d*\s*tty=\S*\s*ruser=<F-USER>\S*</F-USER>\s*rhost=<HOST>\s.*%(__suff)s$
^(error: )?maximum authentication attempts exceeded for <F-USER>.*</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?%(__suff)s$
^User <F-USER>.+</F-USER> not allowed because account is locked%(__suff)s
@ -55,14 +56,14 @@ cmnfailre = ^[aA]uthentication (?:failure|error|failed) for <F-USER>.*</F-USER>
mdre-normal =
mdre-ddos = ^Did not receive identification string from <HOST>%(__on_port_opt)s%(__suff)s
^Connection <F-MLFFORGET>reset</F-MLFFORGET> by <HOST>%(__on_port_opt)s%(__suff)s
mdre-ddos = ^Did not receive identification string from <HOST>
^Connection <F-MLFFORGET>reset</F-MLFFORGET> by <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%(__suff)s
^Read from socket failed: Connection <F-MLFFORGET>reset</F-MLFFORGET> by peer
mdre-extra = ^Received <F-MLFFORGET>disconnect</F-MLFFORGET> from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)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>%(__suff)s$
^Unable to negotiate a <__alg_match>
^no matching <__alg_match> found:
mdre-aggressive = %(mdre-ddos)s

16
fail2ban/tests/config/filter.d/zzz-sshd-obsolete-multiline.conf
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@ -14,8 +14,8 @@ _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*
__on_port_opt = (?: port \d+)?(?: on \S+(?: port \d+)?)?
__suff = (?: (?:port \d+|on \S+|\[preauth\])){0,3}\s*
__on_port_opt = (?: (?:port \d+|on \S+)){0,2}
# single line prefix:
__prefix_line_sl = %(__prefix_line)s%(__pref)s
@ -33,12 +33,12 @@ cmnfailre = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for
^%(__prefix_line_sl)sUser not known to the underlying authentication module for .* from <HOST>\s*%(__suff)s$
^%(__prefix_line_sl)sFailed \S+ for invalid user <F-USER>(?P<cond_user>\S+)|(?:(?! from ).)*?</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)
^%(__prefix_line_sl)sFailed \b(?!publickey)\S+ for (?P<cond_inv>invalid user )?<F-USER>(?P<cond_user>\S+)|(?(cond_inv)(?:(?! from ).)*?|[^:]+)</F-USER> from <HOST>%(__on_port_opt)s(?: ssh\d*)?(?(cond_user): |(?:(?:(?! from ).)*)$)
^%(__prefix_line_sl)sROOT LOGIN REFUSED.* FROM <HOST>%(__suff)s$
^%(__prefix_line_sl)sROOT LOGIN REFUSED FROM <HOST>
^%(__prefix_line_sl)s[iI](?:llegal|nvalid) user .*? from <HOST>%(__suff)s$
^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because not listed in AllowUsers\s*%(__suff)s$
^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because listed in DenyUsers\s*%(__suff)s$
^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because not in any group\s*%(__suff)s$
^%(__prefix_line_sl)srefused connect from \S+ \(<HOST>\)\s*%(__suff)s$
^%(__prefix_line_sl)srefused connect from \S+ \(<HOST>\)
^%(__prefix_line_sl)sReceived disconnect from <HOST>%(__on_port_opt)s:\s*3: .*: Auth fail%(__suff)s$
^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because a group is listed in DenyGroups\s*%(__suff)s$
^%(__prefix_line_sl)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*%(__suff)s$
@ -50,13 +50,13 @@ cmnfailre = ^%(__prefix_line_sl)s[aA]uthentication (?:failure|error|failed) for
mdre-normal =
mdre-ddos = ^%(__prefix_line_sl)sDid not receive identification string from <HOST>%(__suff)s
^%(__prefix_line_sl)sConnection reset by <HOST>%(__suff)s
mdre-ddos = ^%(__prefix_line_sl)sDid not receive identification string from <HOST>
^%(__prefix_line_sl)sConnection reset by <HOST>
^%(__prefix_line_ml1)sSSH: Server;Ltype: (?:Authname|Version|Kex);Remote: <HOST>-\d+;[A-Z]\w+:.*%(__prefix_line_ml2)sRead from socket failed: Connection reset by peer%(__suff)s$
mdre-extra = ^%(__prefix_line_sl)sReceived disconnect from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available%(__suff)s$
mdre-extra = ^%(__prefix_line_sl)sReceived disconnect from <HOST>%(__on_port_opt)s:\s*14: No supported authentication methods available
^%(__prefix_line_sl)sUnable to negotiate with <HOST>%(__on_port_opt)s: no matching <__alg_match> found.
^%(__prefix_line_ml1)sConnection from <HOST>%(__on_port_opt)s%(__prefix_line_ml2)sUnable to negotiate a <__alg_match>%(__suff)s$
^%(__prefix_line_ml1)sConnection from <HOST>%(__on_port_opt)s%(__prefix_line_ml2)sUnable to negotiate a <__alg_match>
^%(__prefix_line_ml1)sConnection from <HOST>%(__on_port_opt)s%(__prefix_line_ml2)sno matching <__alg_match> found:
mdre-aggressive = %(mdre-ddos)s

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