From 1fb7ffe759f5d4ff73a6d271c5b98c8c18a0ad1c Mon Sep 17 00:00:00 2001
From: Michele Bologna <michele.bologna@gmail.com>
Date: Fri, 14 Sep 2018 22:12:52 +0200
Subject: [PATCH 1/8] Feat: ban nginx forbidden accesses If you have configured
 nginx to forbid some paths in your webserver, e.g.:

    location ~ /\. {
      deny all;
    }

if a client tries to access https://yoursite/.user.ini then you will see
in nginx error log:

    2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 10.20.30.40, server: www.example.net, request: "GET /.user.ini HTTP/1.1", host: "www.example.net", referrer: "https://www.example.net"

By carefully setting this filter we ban every IP that tries too many times to
access forbidden resources.

Author: Michele Bologna https://www.michelebologna.net/
---
 config/filter.d/nginx-forbidden.conf      | 21 +++++++++++++++++++++
 fail2ban/tests/files/logs/nginx-forbidden |  5 +++++
 2 files changed, 26 insertions(+)
 create mode 100644 config/filter.d/nginx-forbidden.conf
 create mode 100644 fail2ban/tests/files/logs/nginx-forbidden

diff --git a/config/filter.d/nginx-forbidden.conf b/config/filter.d/nginx-forbidden.conf
new file mode 100644
index 00000000..3c54e61e
--- /dev/null
+++ b/config/filter.d/nginx-forbidden.conf
@@ -0,0 +1,21 @@
+# fail2ban filter configuration for nginx forbidden accesses
+#
+# If you have configured nginx to forbid some paths in your webserver, e.g.:
+#
+#       location ~ /\. {
+#         deny all;
+#       }
+#
+# if a client tries to access https://yoursite/.user.ini then you will see
+# in nginx error log:
+#
+# 2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 10.20.30.40, server: www.example.net, request: "GET /.user.ini HTTP/1.1", host: "www.example.net", referrer: "https://www.example.net"
+#
+# By carefully setting this filter we ban every IP that tries too many times to
+# access forbidden resources.
+#
+# Author: Michele Bologna https://www.michelebologna.net/
+
+[Definition]
+failregex = \[error\] \d+#\d+: \*\d+ access forbidden by rule, client: <HOST>
+ignoreregex =
diff --git a/fail2ban/tests/files/logs/nginx-forbidden b/fail2ban/tests/files/logs/nginx-forbidden
new file mode 100644
index 00000000..6da3ed01
--- /dev/null
+++ b/fail2ban/tests/files/logs/nginx-forbidden
@@ -0,0 +1,5 @@
+# failJSON: { "time": "2018-09-14T19:03:05", "match": true , "host": "12.34.56.78" }
+2018/09/14 19:03:05 [error] 2035#2035: *9134 access forbidden by rule, client: 12.34.56.78, server: www.example.net, request: "GET /wp-content/themes/evolve/js/back-end/libraries/fileuploader/upload_handler.php HTTP/1.1", host: "www.example.net", referrer: "http://example.net/foo.php"
+
+# failJSON: { "time": "2018-09-13T15:42:05", "match": true , "host": "12.34.56.78" }
+2018/09/13 15:42:05 [error] 2035#2035: *287 access forbidden by rule, client: 12.34.56.78, server: www.example.com, request: "GET /wp-config.php~ HTTP/1.1", host: "www.example.com"

From 7e88ae0ee66628893a283d6fed06a347f9f6673e Mon Sep 17 00:00:00 2001
From: Michele Bologna <michele.bologna@gmail.com>
Date: Fri, 14 Sep 2018 23:08:12 +0200
Subject: [PATCH 2/8] Feat: add forbidden to jail.conf

---
 config/jail.conf | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/config/jail.conf b/config/jail.conf
index 697c81dd..a6f2ac5a 100644
--- a/config/jail.conf
+++ b/config/jail.conf
@@ -390,6 +390,11 @@ port     = http,https
 logpath  = %(nginx_error_log)s
 maxretry = 2
 
+[nginx-forbidden]
+
+port     = http,https
+logpath  = %(nginx_error_log)s
+maxretry = 10
 
 # Ban attackers that try to use PHP's URL-fopen() functionality
 # through GET/POST variables. - Experimental, with more than a year

From c7f8b75e7e013ac893daf78eacfdba98f2c9b689 Mon Sep 17 00:00:00 2001
From: "Sergey G. Brester" <serg.brester@sebres.de>
Date: Wed, 15 Mar 2023 15:03:48 +0100
Subject: [PATCH 3/8] action.d/cloudflare-token.conf: fixes #3479, url-encode
 args by unban

---
 config/action.d/cloudflare-token.conf | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/config/action.d/cloudflare-token.conf b/config/action.d/cloudflare-token.conf
index 8c5c37de..287621eb 100644
--- a/config/action.d/cloudflare-token.conf
+++ b/config/action.d/cloudflare-token.conf
@@ -50,11 +50,12 @@ actionban = curl -s -X POST "<_cf_api_url>" \
 #          <time>  unix timestamp of the ban time
 # Values:  CMD
 #
-actionunban = id=$(curl -s -X GET "<_cf_api_url>?mode=<cfmode>&notes=<notes>&configuration.target=<cftarget>&configuration.value=<ip>" \
-                       <_cf_api_prms> \
-                       | awk -F"[,:}]" '{for(i=1;i<=NF;i++){if($i~/'id'\042/){print $(i+1)}}}' \
-                       | tr -d ' "' \
-                       | head -n 1)
+actionunban = id=$(curl -s -X GET "<_cf_api_url>" \
+              --data-urlencode "mode=<cfmode>" --data-urlencode "notes=<notes>" --data-urlencode "configuration.target=<cftarget>" --data-urlencode "configuration.value=<ip>" \
+              <_cf_api_prms> \
+                  | awk -F"[,:}]" '{for(i=1;i<=NF;i++){if($i~/'id'\042/){print $(i+1)}}}' \
+                  | tr -d ' "' \
+                  | head -n 1)
               if [ -z "$id" ]; then echo "<name>: id for <ip> cannot be found using target <cftarget>"; exit 0; fi; \
               curl -s -X DELETE "<_cf_api_url>/$id" \
                   <_cf_api_prms> \

From 3d4bed50c2db1500365e80758c7a392b1f0ffd48 Mon Sep 17 00:00:00 2001
From: "Sergey G. Brester" <serg.brester@sebres.de>
Date: Wed, 15 Mar 2023 15:08:45 +0100
Subject: [PATCH 4/8] changelog entry (gh-3479)

---
 ChangeLog | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ChangeLog b/ChangeLog
index a2259e36..0cc088eb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@ ver. 1.0.3-dev-1 (20??/??/??) - development nightly edition
 
 ### Fixes
 * circumvent SEGFAULT in a python's socket module by getaddrinfo with disabled IPv6 (gh-3438)
+* `action.d/cloudflare-token.conf` - fixes gh-3479, url-encode args by unban
 
 ### New Features and Enhancements
 * better auto-detection for IPv6 support (`allowipv6 = auto` by default), trying to check sysctl net.ipv6.conf.all.disable_ipv6

From 212a4c236aaeeac79a8f24cf8758d4e7aa4375e5 Mon Sep 17 00:00:00 2001
From: "Sergey G. Brester" <serg.brester@sebres.de>
Date: Thu, 23 Mar 2023 12:12:55 +0100
Subject: [PATCH 5/8] update changeLog, nginx-forbidden, gh-2226

---
 ChangeLog | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ChangeLog b/ChangeLog
index 0cc088eb..d13057c9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -19,6 +19,7 @@ ver. 1.0.3-dev-1 (20??/??/??) - development nightly edition
   (value read from `/proc/sys/net/ipv6/conf/all/disable_ipv6`) if available, otherwise seeks over local IPv6 from network interfaces
   if available for platform and uses DNS to find local IPv6 as a fallback only
 * improve `ignoreself` by considering all local addresses from network interfaces additionally to IPs from hostnames (gh-3132)
+* `filter.d/nginx-forbidden.conf` - new filter to ban forbidden locations, e. g. using `deny` directive (gh-2226)
 
 
 ver. 1.0.2 (2022/11/09) - finally-war-game-test-tape-not-a-nuclear-alarm

From 9cbf59c82718a82887f7326d8f58bc0a185dc292 Mon Sep 17 00:00:00 2001
From: "Sergey G. Brester" <serg.brester@sebres.de>
Date: Thu, 23 Mar 2023 12:16:13 +0100
Subject: [PATCH 6/8] anchored datepattern and added journalmatch (if
 monitoring systemd journal)

---
 config/filter.d/nginx-forbidden.conf | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/config/filter.d/nginx-forbidden.conf b/config/filter.d/nginx-forbidden.conf
index 3c54e61e..62d15a41 100644
--- a/config/filter.d/nginx-forbidden.conf
+++ b/config/filter.d/nginx-forbidden.conf
@@ -19,3 +19,7 @@
 [Definition]
 failregex = \[error\] \d+#\d+: \*\d+ access forbidden by rule, client: <HOST>
 ignoreregex =
+
+datepattern = {^LN-BEG}
+
+journalmatch = _SYSTEMD_UNIT=nginx.service + _COMM=nginx

From 56485c8548785de5083f53beb33b42228d756fc9 Mon Sep 17 00:00:00 2001
From: sebres <serg.brester@sebres.de>
Date: Tue, 4 Apr 2023 12:46:35 +0200
Subject: [PATCH 7/8] filtertestcase.py: byte related copy of lines in tests
 (locale independent); closes gh-2936

---
 fail2ban/helpers.py              |  3 ++
 fail2ban/tests/filtertestcase.py | 61 ++++++++++++++++++--------------
 2 files changed, 37 insertions(+), 27 deletions(-)

diff --git a/fail2ban/helpers.py b/fail2ban/helpers.py
index 5c1750a6..de8a2794 100644
--- a/fail2ban/helpers.py
+++ b/fail2ban/helpers.py
@@ -98,6 +98,8 @@ if sys.version_info >= (3,): # pragma: 2.x no cover
 		if not isinstance(x, bytes):
 			return str(x)
 		return x.decode(PREFER_ENC, 'replace')
+	def uni_bytes(x):
+		return bytes(x, 'UTF-8')
 else: # pragma: 3.x no cover
 	def uni_decode(x, enc=PREFER_ENC, errors='strict'):
 		try:
@@ -115,6 +117,7 @@ else: # pragma: 3.x no cover
 			return x.encode(PREFER_ENC, 'replace')
 	else:
 		uni_string = str
+	uni_bytes = bytes
 
 
 def _as_bool(val):
diff --git a/fail2ban/tests/filtertestcase.py b/fail2ban/tests/filtertestcase.py
index 4e308e38..9fea84af 100644
--- a/fail2ban/tests/filtertestcase.py
+++ b/fail2ban/tests/filtertestcase.py
@@ -36,6 +36,7 @@ try:
 except ImportError:
 	journal = None
 
+from ..helpers import uni_bytes
 from ..server.jail import Jail
 from ..server.filterpoll import FilterPoll
 from ..server.filter import FailTicket, Filter, FileFilter, FileContainer
@@ -109,6 +110,7 @@ class _tmSerial():
 		return "%s%02u" % (c._str_s, sec)
 
 _tm = _tmSerial._tm
+_tmb = lambda t: uni_bytes(_tm(t))
 
 
 def _assert_equal_entries(utest, found, output, count=None):
@@ -204,6 +206,8 @@ def _copy_lines_between_files(in_, fout, n=None, skip=0, mode='a', terminal_line
 	# on old Python st_mtime is int, so we should give at least 1 sec so
 	# polling filter could detect the change
 	mtimesleep()
+	if terminal_line is not None:
+		terminal_line = uni_bytes(terminal_line)
 	if isinstance(in_, str): # pragma: no branch - only used with str in test cases
 		fin = open(in_, 'rb')
 	else:
@@ -213,18 +217,21 @@ def _copy_lines_between_files(in_, fout, n=None, skip=0, mode='a', terminal_line
 		fin.readline()
 	# Read
 	i = 0
-	if not lines: lines = []
+	if lines:
+		lines = map(uni_bytes, lines)
+	else:
+		lines = []
 	while n is None or i < n:
-		l = fin.readline().decode('UTF-8', 'replace').rstrip('\r\n')
+		l = fin.readline().rstrip(b'\r\n')
 		if terminal_line is not None and l == terminal_line:
 			break
 		lines.append(l)
 		i += 1
 	# Write: all at once and flush
 	if isinstance(fout, str):
-		fout = open(fout, mode)
+		fout = open(fout, mode+'b')
 	DefLogSys.debug('  ++ write %d test lines', len(lines))
-	fout.write('\n'.join(lines)+'\n')
+	fout.write(b'\n'.join(lines)+b'\n')
 	fout.flush()
 	if isinstance(in_, str): # pragma: no branch - only used with str in test cases
 		# Opened earlier, therefore must close it
@@ -711,7 +718,7 @@ class LogFileFilterPoll(unittest.TestCase):
 		self.filter.setDatePattern(r'^%ExY-%Exm-%Exd %ExH:%ExM:%ExS')
 		fname = tempfile.mktemp(prefix='tmp_fail2ban', suffix='.log')
 		time = 1417512352
-		f = open(fname, 'w')
+		f = open(fname, 'wb')
 		fc = None
 		try:
 			fc = FileContainer(fname, self.filter.getLogEncoding())
@@ -722,7 +729,7 @@ class LogFileFilterPoll(unittest.TestCase):
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 0)
 			# one entry with exact time:
-			f.write("%s [sshd] error: PAM: failure len 1\n" % _tm(time))
+			f.write(b"%s [sshd] error: PAM: failure len 1\n" % _tmb(time))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 
@@ -734,7 +741,7 @@ class LogFileFilterPoll(unittest.TestCase):
 			fc.open()
 			# no time - nothing should be found :
 			for i in xrange(10):
-				f.write("[sshd] error: PAM: failure len 1\n")
+				f.write(b"[sshd] error: PAM: failure len 1\n")
 				f.flush()
 				fc.setPos(0); self.filter.seekToTime(fc, time)
 
@@ -745,38 +752,38 @@ class LogFileFilterPoll(unittest.TestCase):
 			fc = FileContainer(fname, self.filter.getLogEncoding())
 			fc.open()
 			# one entry with smaller time:
-			f.write("%s [sshd] error: PAM: failure len 2\n" % _tm(time - 10))
+			f.write(b"%s [sshd] error: PAM: failure len 2\n" % _tmb(time - 10))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 53)
 			# two entries with smaller time:
-			f.write("%s [sshd] error: PAM: failure len 3 2 1\n" % _tm(time - 9))
+			f.write(b"%s [sshd] error: PAM: failure len 3 2 1\n" % _tmb(time - 9))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 110)
 			# check move after end (all of time smaller):
-			f.write("%s [sshd] error: PAM: failure\n" % _tm(time - 1))
+			f.write(b"%s [sshd] error: PAM: failure\n" % _tmb(time - 1))
 			f.flush()
 			self.assertEqual(fc.getFileSize(), 157)
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 157)
 
 			# stil one exact line:
-			f.write("%s [sshd] error: PAM: Authentication failure\n" % _tm(time))
-			f.write("%s [sshd] error: PAM: failure len 1\n" % _tm(time))
+			f.write(b"%s [sshd] error: PAM: Authentication failure\n" % _tmb(time))
+			f.write(b"%s [sshd] error: PAM: failure len 1\n" % _tmb(time))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 157)
 
 			# add something hereafter:
-			f.write("%s [sshd] error: PAM: failure len 3 2 1\n" % _tm(time + 2))
-			f.write("%s [sshd] error: PAM: Authentication failure\n" % _tm(time + 3))
+			f.write(b"%s [sshd] error: PAM: failure len 3 2 1\n" % _tmb(time + 2))
+			f.write(b"%s [sshd] error: PAM: Authentication failure\n" % _tmb(time + 3))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 157)
 			# add something hereafter:
-			f.write("%s [sshd] error: PAM: failure\n" % _tm(time + 9))
-			f.write("%s [sshd] error: PAM: failure len 4 3 2\n" % _tm(time + 9))
+			f.write(b"%s [sshd] error: PAM: failure\n" % _tmb(time + 9))
+			f.write(b"%s [sshd] error: PAM: failure len 4 3 2\n" % _tmb(time + 9))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 157)
@@ -797,7 +804,7 @@ class LogFileFilterPoll(unittest.TestCase):
 		self.filter.setDatePattern(r'^%ExY-%Exm-%Exd %ExH:%ExM:%ExS')
 		fname = tempfile.mktemp(prefix='tmp_fail2ban', suffix='.log')
 		time = 1417512352
-		f = open(fname, 'w')
+		f = open(fname, 'wb')
 		fc = None
 		count = 1000 if unittest.F2B.fast else 10000
 		try:
@@ -808,14 +815,14 @@ class LogFileFilterPoll(unittest.TestCase):
 			# write lines with smaller as search time:
 			t = time - count - 1
 			for i in xrange(count):
-				f.write("%s [sshd] error: PAM: failure\n" % _tm(t))
+				f.write(b"%s [sshd] error: PAM: failure\n" % _tmb(t))
 				t += 1
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 47*count)
 			# write lines with exact search time:
 			for i in xrange(10):
-				f.write("%s [sshd] error: PAM: failure\n" % _tm(time))
+				f.write(b"%s [sshd] error: PAM: failure\n" % _tmb(time))
 			f.flush()
 			fc.setPos(0); self.filter.seekToTime(fc, time)
 			self.assertEqual(fc.getPos(), 47*count)
@@ -825,7 +832,7 @@ class LogFileFilterPoll(unittest.TestCase):
 			t = time+1
 			for i in xrange(count//500):
 				for j in xrange(500):
-					f.write("%s [sshd] error: PAM: failure\n" % _tm(t))
+					f.write(b"%s [sshd] error: PAM: failure\n" % _tmb(t))
 					t += 1
 				f.flush()
 				fc.setPos(0); self.filter.seekToTime(fc, time)
@@ -847,7 +854,7 @@ class LogFileMonitor(LogCaptureTestCase):
 		LogCaptureTestCase.setUp(self)
 		self.filter = self.name = 'NA'
 		_, self.name = tempfile.mkstemp('fail2ban', 'monitorfailures')
-		self.file = open(self.name, 'a')
+		self.file = open(self.name, 'ab')
 		self.filter = FilterPoll(DummyJail())
 		self.filter.addLogPath(self.name, autoSeek=False)
 		self.filter.active = True
@@ -899,7 +906,7 @@ class LogFileMonitor(LogCaptureTestCase):
 		_org_processLine = self.filter.processLine
 		self.filter.processLine = None
 		for i in range(100):
-			self.file.write("line%d\n" % 1)
+			self.file.write(b"line%d\n" % 1)
 		self.file.flush()
 		for i in range(100):
 			self.filter.getFailures(self.name)
@@ -910,7 +917,7 @@ class LogFileMonitor(LogCaptureTestCase):
 		self.filter.idle = False
 		self.filter.getFailures(self.name)
 		self.filter.processLine = _org_processLine
-		self.file.write("line%d\n" % 1)
+		self.file.write(b"line%d\n" % 1)
 		self.file.flush()
 		self.filter.getFailures(self.name)
 		self.assertNotLogged('Failed to process line:')
@@ -934,7 +941,7 @@ class LogFileMonitor(LogCaptureTestCase):
 		mtimesleep()				# to guarantee freshier mtime
 		for i in range(4):			  # few changes
 			# unless we write into it
-			self.file.write("line%d\n" % i)
+			self.file.write(b"line%d\n" % i)
 			self.file.flush()
 			self.assertTrue(self.isModified())
 			self.assertTrue(self.notModified())
@@ -943,11 +950,11 @@ class LogFileMonitor(LogCaptureTestCase):
 		# we are not signaling as modified whenever
 		# it gets away
 		self.assertTrue(self.notModified(1))
-		f = open(self.name, 'a')
+		f = open(self.name, 'ab')
 		self.assertTrue(self.isModified())
 		self.assertTrue(self.notModified())
 		mtimesleep()
-		f.write("line%d\n" % i)
+		f.write(b"line%d\n" % i)
 		f.flush()
 		self.assertTrue(self.isModified())
 		self.assertTrue(self.notModified())
@@ -1077,7 +1084,7 @@ def get_monitor_failures_testcase(Filter_):
 			self.filter = self.name = 'NA'
 			self.name = '%s-%d' % (testclass_name, self.count)
 			MonitorFailures.count += 1 # so we have unique filenames across tests
-			self.file = open(self.name, 'a')
+			self.file = open(self.name, 'ab')
 			self.jail = DummyJail()
 			self.filter = Filter_(self.jail)
 			# mock-up common error to find catched unhandled exceptions:

From 27294c4b9ee5d5568a1d5f83af744ea39d5a1acb Mon Sep 17 00:00:00 2001
From: "Sergey G. Brester" <serg.brester@sebres.de>
Date: Tue, 4 Apr 2023 13:30:12 +0200
Subject: [PATCH 8/8] fail2banregextestcase: compatibility fix for testWrongRE

---
 fail2ban/tests/fail2banregextestcase.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fail2ban/tests/fail2banregextestcase.py b/fail2ban/tests/fail2banregextestcase.py
index 213ea89b..4b11ef9a 100644
--- a/fail2ban/tests/fail2banregextestcase.py
+++ b/fail2ban/tests/fail2banregextestcase.py
@@ -146,7 +146,7 @@ class Fail2banRegexTest(LogCaptureTestCase):
 			"test", r"^(?:(?P<type>A)|B)? (?(typo)...) from <ADDR>"
 		))
 		self.assertLogged("Unable to compile regular expression")
-		self.assertLogged("unknown group name: 'typo'", "at position 23", all=False); # details of failed compilation
+		self.assertLogged("unknown group name", "at position 23", all=False); # details of failed compilation
 
 	def testWrongIngnoreRE(self):
 		self.assertFalse(_test_exec(