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banip: bump to release 0.9.3-1

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* provides an option to transfer log events on remote servers via cgi interface (disabled by default), see readme for details
* refine the allowlist check to support IP intervals as well before adding an IP to the blocklist

Signed-off-by: Dirk Brenken <dev@brenken.org>
This commit is contained in:
Dirk Brenken 2023-12-11 17:35:13 +01:00
parent b8254cdac4
commit df81585cea
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GPG key ID: 9D71CD547BFAE684
5 changed files with 62 additions and 4 deletions
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7
net/banip/Makefile
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@ -5,8 +5,8 @@
include $(TOPDIR)/rules.mk
PKG_NAME:=banip
PKG_VERSION:=0.9.2
PKG_RELEASE:=4
PKG_VERSION:=0.9.3
PKG_RELEASE:=1
PKG_LICENSE:=GPL-3.0-or-later
PKG_MAINTAINER:=Dirk Brenken <dev@brenken.org>
@ -63,6 +63,9 @@ define Package/banip/install
$(INSTALL_CONF) ./files/banip.countries $(1)/etc/banip
$(INSTALL_CONF) ./files/banip.feeds $(1)/etc/banip
$(INSTALL_CONF) ./files/banip.custom.feeds $(1)/etc/banip
$(INSTALL_DIR) $(1)/www/cgi-bin
$(INSTALL_BIN) ./files/banip.cgi $(1)/www/cgi-bin/banip
endef
$(eval $(call BuildPackage,banip))

18
net/banip/files/README.md
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@ -89,6 +89,7 @@ IP address blocking is commonly used to protect against brute force attacks, pre
* Add new or edit existing banIP feeds on your own with the LuCI integrated custom feed editor
* Supports external allowlist URLs to reference additional IPv4/IPv6 feeds
* Supports allowing / blocking of certain VLAN forwards
* Provides an option to transfer logging events on remote servers via cgi interface
## Prerequisites
* **[OpenWrt](https://openwrt.org)**, latest stable release or a snapshot with nft/firewall 4 support
@ -141,7 +142,7 @@ Available commands:
| ban_filelimit | option | 1024 | ulimit max open/number of files (range 1024-4096) |
| ban_loglimit | option | 100 | scan only the last n log entries permanently. A value of '0' disables the monitor |
| ban_logcount | option | 1 | how many times the IP must appear in the log to be considered as suspicious |
| ban_logterm | list | regex | various regex for logfile parsing (default: dropbear, sshd, luci, nginx, asterisk) |
| ban_logterm | list | regex | various regex for logfile parsing (default: dropbear, sshd, luci, nginx, asterisk and cgi-remote events) |
| ban_logreadfile | option | /var/log/messages | alternative location for parsing the log file, e.g. via syslog-ng, to deactivate the standard parsing via logread |
| ban_autodetect | option | 1 | auto-detect wan interfaces, devices and subnets |
| ban_debug | option | 0 | enable banIP related debug logging |
@ -191,6 +192,8 @@ Available commands:
| ban_mailnotification | option | 0 | receive E-Mail notifications with every banIP run |
| ban_reportelements | option | 1 | count Set elements in the report, disable this option to speed up the report significantly |
| ban_resolver | option | - | external resolver used for DNS lookups |
| ban_remotelog | option | 0 | enable the cgi interface to receive remote logging events |
| ban_remotetoken | option | - | unique token to communicate with the cgi interface |
## Examples
**banIP report information**
@ -292,6 +295,7 @@ list ban_logterm 'luci: failed login'
list ban_logterm 'error: maximum authentication attempts exceeded'
list ban_logterm 'sshd.*Connection closed by.*\[preauth\]'
list ban_logterm 'SecurityEvent=\"InvalidAccountID\".*RemoteAddress='
list ban_logterm 'received a suspicious remote IP '\''.*'\'''
```
**allow-/blocklist handling**
@ -324,6 +328,18 @@ MAC-address with IPv4 and IPv6 wildcard concatenation:
C8:C2:9B:F7:80:12 192.168.1.10 => this will be populated to v4MAC-Set with the certain IP
C8:C2:9B:F7:80:12 => this will be populated to v6MAC-Set with the IP-wildcard ::/0
```
**enable the cgi interface to receive remote logging events**
banIP ships a basic cgi interface in '/www/cgi-bin/banip' to receive remote logging events (disabled by default). The cgi interface evaluates logging events via GET or POST request (see examples below). To enable the cgi interface set the following options:
* set 'ban_remotelog' to '1' to enbale the cgi interface
* set 'ban_remotetoken' to a secret transfer token, allowed token characters consist of '[A-Za-z]', '[0-9]', '.' and ':'
Examples to transfer remote logging events from an internal server to banIP via cgi interface:
* POST request: curl --insecure --data "<ban_remotetoken>=<suspicious IP>" https://192.168.1.1/cgi-bin/banip
* GET request: wget --no-check-certificate https://192.168.1.1/cgi-bin/banip?<ban_remotetoken>=<suspicious IP>
Please note: for security reasons use this cgi interface only internally and only encrypted via https transfer protocol.
**redirect Asterisk security logs to lodg/logread**
banIP only supports logfile scanning via logread, so to monitor attacks on Asterisk, its security log must be available via logread. To do this, edit '/etc/asterisk/logger.conf' and add the line 'syslog.local0 = security', then run 'asterisk -rx reload logger' to update the running Asterisk configuration.

4
net/banip/files/banip-functions.sh
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@ -43,6 +43,8 @@ ban_mailtopic="banIP notification"
ban_mailprofile="ban_notify"
ban_mailnotification="0"
ban_reportelements="1"
ban_remotelog="0"
ban_remotetoken=""
ban_nftloglevel="warn"
ban_nftpriority="-200"
ban_nftpolicy="memory"
@ -1526,7 +1528,7 @@ f_monitor() {
ip="${ip##* }"
[ -n "${ip}" ] && proto="v6"
fi
if [ -n "${proto}" ] && ! "${ban_nftcmd}" get element inet banIP blocklist"${proto}" "{ ${ip} }" >/dev/null 2>&1 && ! "${ban_grepcmd}" -q "^${ip}" "${ban_allowlist}"; then
if [ -n "${proto}" ] && ! "${ban_nftcmd}" get element inet banIP allowlist"${proto}" "{ ${ip} }" >/dev/null 2>&1 && ! "${ban_nftcmd}" get element inet banIP blocklist"${proto}" "{ ${ip} }" >/dev/null 2>&1; then
f_log "info" "suspicious IP '${ip}'"
log_raw="$(eval ${loglimit_cmd})"
log_count="$(printf "%s\n" "${log_raw}" | "${ban_grepcmd}" -c "suspicious IP '${ip}'")"

36
net/banip/files/banip.cgi Normal file
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@ -0,0 +1,36 @@
#!/bin/sh
# banIP cgi remote logging script - ban incoming and outgoing IPs via named nftables Sets
# Copyright (c) 2018-2023 Dirk Brenken (dev@brenken.org)
# This is free software, licensed under the GNU General Public License v3.
# (s)hellcheck exceptions
# shellcheck disable=all
# handle post/get requests
#
post_string="$(cat)"
request="${post_string//[^[:alnum:]=\.\:]/}"
[ -z "${request}" ] && request="${QUERY_STRING//[^[:alnum:]=\.\:]/}"
request_decode() {
local key value token
key="${request%=*}"
value="${request#*=}"
token="$(uci -q get banip.global.ban_remotetoken)"
if [ -n "${key}" ] && [ -n "${value}" ] && [ "${key}" = "${token}" ] && /etc/init.d/banip running; then
[ -r "/usr/lib/banip-functions.sh" ] && { . "/usr/lib/banip-functions.sh"; f_conf; }
if [ "${ban_remotelog}" = "1" ] && [ -x "${ban_logreadcmd}" ] && [ -n "${ban_logterm%%??}" ] && [ "${ban_loglimit}" != "0" ]; then
f_log "info" "received a suspicious remote IP '${value}'"
fi
fi
}
cat <<EOF
Status: 202 Accepted
Content-Type: text/plain; charset=UTF-8
EOF
request_decode

1
net/banip/files/banip.conf
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@ -7,3 +7,4 @@ config banip 'global'
list ban_logterm 'error: maximum authentication attempts exceeded'
list ban_logterm 'sshd.*Connection closed by.*\[preauth\]'
list ban_logterm 'SecurityEvent=\"InvalidAccountID\".*RemoteAddress='
list ban_logterm 'received a suspicious remote IP '\''.*'\'''