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grouped tags (`<ADDR>`, `<HOST>`, `<SUBNET>`) recognize IP addresses enclosed in square brackets, closes gh-2494

pull/2560/head
sebres 2019-11-04 11:33:11 +01:00
parent d44607a161
commit e5d02bc2e9
3 changed files with 13 additions and 12 deletions
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2
ChangeLog
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@ -77,11 +77,13 @@ ver. 0.10.5-dev-1 (20??/??/??) - development edition
* `filter.d/named-refused.conf`:
- support BIND 9.11.0 log format (includes an additional field @0xXXX..., gh-2406);
- `prefregex` extended, more selective now (denied/NOTAUTH suffix moved from failregex, so no catch-all there anymore)
* all filters would accept square brackets around IPv4 addresses also (e. g. monit-filter, gh-2494)
### New Features
* new replacement tags for failregex to match subnets in form of IP-addresses with CIDR mask (gh-2559):
- `<CIDR>` - helper regex to match CIDR (simple integer form of net-mask);
- `<SUBNET>` - regex to match sub-net adresses (in form of IP/CIDR, also single IP is matched, so part /CIDR is optional);
* grouped tags (`<ADDR>`, `<HOST>`, `<SUBNET>`) recognize IP addresses enclosed in square brackets
* new failregex-flag tag `<F-MLFGAINED>` for failregex, signaled that the access to service was gained
(ATM used similar to tag `<F-NOFAIL>`, but it does not add the log-line to matches, gh-2279)
* filters: introduced new configuration parameter `logtype` (default `file` for file-backends, and

20
fail2ban/server/failregex.py
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@ -37,8 +37,6 @@ R_HOST = [
r"""(?:::f{4,6}:)?(?P<ip4>%s)""" % (IPAddr.IP_4_RE,),
# separated ipv6:
r"""(?P<ip6>%s)""" % (IPAddr.IP_6_RE,),
# place-holder for ipv6 enclosed in optional [] (used in addr-, host-regex)
"",
# separated dns:
r"""(?P<dns>[\w\-.^_]*\w)""",
# place-holder for ADDR tag-replacement (joined):
@ -52,17 +50,15 @@ R_HOST = [
]
RI_IPV4 = 0
RI_IPV6 = 1
RI_IPV6BR = 2
RI_DNS = 3
RI_ADDR = 4
RI_HOST = 5
RI_CIDR = 6
RI_SUBNET = 7
RI_DNS = 2
RI_ADDR = 3
RI_HOST = 4
RI_CIDR = 5
RI_SUBNET = 6
R_HOST[RI_IPV6BR] = r"""\[?%s\]?""" % (R_HOST[RI_IPV6],)
R_HOST[RI_ADDR] = "(?:%s|%s)" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6BR],)
R_HOST[RI_HOST] = "(?:%s|%s|%s)" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6BR], R_HOST[RI_DNS],)
R_HOST[RI_SUBNET] = r"""(?:%s|%s)(?:/%s)?""" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6], R_HOST[RI_CIDR],)
R_HOST[RI_ADDR] = r"\[?(?:%s|%s)\]?" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6],)
R_HOST[RI_HOST] = r"(?:%s|%s)" % (R_HOST[RI_ADDR], R_HOST[RI_DNS],)
R_HOST[RI_SUBNET] = r"\[?(?:%s|%s)(?:/%s)?\]?" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6], R_HOST[RI_CIDR],)
RH4TAG = {
# separated ipv4 (self closed, closed):

3
fail2ban/tests/files/logs/monit
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@ -19,3 +19,6 @@ Mar 9 09:18:32 hostname monit[5731]: HttpRequest: access denied -- client 1.2.3
Mar 9 09:18:33 hostname monit[5731]: HttpRequest: access denied -- client 1.2.3.4: unknown user 'test1'
# failJSON: { "time": "2005-03-09T09:18:34", "match": true, "host": "1.2.3.4", "desc": "wrong password try" }
Mar 9 09:18:34 hostname monit[5731]: HttpRequest: access denied -- client 1.2.3.4: wrong password for user 'test2'
# failJSON: { "time": "2005-08-06T10:14:52", "match": true, "host": "192.168.1.85", "desc": "IP in brackets, gh-2494" }
[CEST Aug 6 10:14:52] error : HttpRequest: access denied -- client [192.168.1.85]: wrong password for user 'root'