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From 4337e366163278815ea9fc6c952bffb579e885a0 Mon Sep 17 00:00:00 2001
From: sebres <info@sebres.de>
Date: Tue, 21 Jun 2022 16:56:57 +0200
Subject: [PATCH] wrap global flags like ((?i)xxx) or (?:(?i)xxx) to local
flags (?i:xxx) if supported by RE-engine in the python version
---
fail2ban/server/failregex.py | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/fail2ban/server/failregex.py
+++ b/fail2ban/server/failregex.py
@@ -91,6 +91,13 @@ R_MAP = {
"port": "fport",
}
+# map global flags like ((?i)xxx) or (?:(?i)xxx) to local flags (?i:xxx) if supported by RE-engine in this python version:
+try:
+ re.search("^re(?i:val)$", "reVAL")
+ R_GLOB2LOCFLAGS = ( re.compile(r"(?<!\\)\((?:\?:)?(\(\?[a-z]+)\)"), r"\1:" )
+except:
+ R_GLOB2LOCFLAGS = ()
+
def mapTag2Opt(tag):
tag = tag.lower()
return R_MAP.get(tag, tag)
@@ -128,6 +135,9 @@ class Regex:
#
if regex.lstrip() == '':
raise RegexException("Cannot add empty regex")
+ # special handling wrapping global flags to local flags:
+ if R_GLOB2LOCFLAGS:
+ regex = R_GLOB2LOCFLAGS[0].sub(R_GLOB2LOCFLAGS[1], regex)
try:
self._regexObj = re.compile(regex, re.MULTILINE if multiline else 0)
self._regex = regex
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