Teler - Real-time HTTP Intrusion Detection

Teler – Real-time HTTP Intrusion Detection

teler is an real-time intrusion detection and threat alert based on web log that runs in a terminal with resources that we collect and provide by the community.

Features

  • Real-time: Analyze logs and identify suspicious activity in real-time.

  • Alerting: teler provides alerting when a threat is detected, push notifications include Slack, Telegram and Discord.

  • Monitoring: We’ve our own metrics if you want to monitor threats easily, and we use Prometheus for that.

  • Latest resources: Collections is continuously up-to-date.

  • Minimal configuration: You can just run it against your log file, write the log format and let teler analyze the log and show you alerts!

  • Flexible log formats: teler allows any custom log format string! It all depends on how you write the log format in configuration file.

  • Incremental log processing: Need data persistence rather than buffer stream? teler has the ability to process logs incrementally through the on-disk persistence options.

Why teler?

teler was designed to be a fast, terminal-based threat analyzer. Its core idea is to quickly analyze and hunt threats in real time!

Installation

from Binary

The installation is easy. You can download a prebuilt binary from releases page, unpack and run! or run with:

▶ curl -sSfL 'https://ktbs.dev/get-teler.sh' | sh -s -- -b /usr/local/bin

using Docker

Pull the Docker image by running:

▶ docker pull kitabisa/teler

from Source

If you have go1.14+ compiler installed and configured:

▶ GO111MODULE=on go get -v -u ktbs.dev/teler/cmd/teler

In order to update the tool, you can use -u flag with go get command.

from GitHub

▶ git clone https://github.com/kitabisa/teler
▶ cd teler
▶ make build
▶ mv ./bin/teler /usr/local/bin

Usage

Simply, teler can be run with:

▶ [buffers] | teler -c /path/to/config/teler.yaml
# or
▶ teler -i /path/to/access.log -c /path/to/config/teler.yaml

If you’ve built teler with a Docker image:

▶ [buffers] | docker run -i --rm -e TELER_CONFIG=/path/to/config/teler.yaml teler
# or
▶ docker run -i --rm -e TELER_CONFIG=/path/to/config/teler.yaml teler --input /path/to/access.log

Flags

▶ teler -h

This will display help for the tool.

 

Here are all the switches it supports.

FlagDescriptionExamples
-c,
–config
teler configuration filekubectl logs nginx | teler -c /path/to/config/teler.yaml
-i,
–input
Analyze logs from data persistence rather than buffer streamteler -i /var/log/nginx/access.log
-x,
–concurrent
Set the concurrency level to analyze logs
(default: 20)
tail -f /var/log/nginx/access.log | teler -x 50
-o,
–output
Save detected threats to fileteler -i /var/log/nginx/access.log -o /tmp/threats.log
–jsonDisplay threats in the terminal as JSON formatteler -i /var/log/nginx/access.log –json
–rm-cacheRemove all cached resourcesteler –rm-cache
-v,
–version
Show current teler versionteler -v

Config

The -c flag is to specify teler configuration file.

▶ tail -f /var/log/nginx/access.log | teler -c /path/to/config/teler.yaml

This is required, but if you have defined TELER_CONFIG environment you don’t need to use this flag, e.g.:

▶ export TELER_CONFIG="/path/to/config/teler.yaml"
▶ tail -f /var/log/nginx/access.log | teler
# or
▶ tail -f /var/log/nginx/access.log | TELER_CONFIG="/path/to/config/teler.yaml" teler

Input

Need log analysis incrementally? This -i flag is useful for that.

▶ teler -i /var/log/nginx/access.log

Concurrency

Concurrency is the number of logs analyzed at the same time. Default value teler provide is 20, you can change it by using -x flag.

▶ teler -i /var/log/nginx/access.log -x 50

Output

You can also save the detected threats into a file with -o flag.

▶ teler -i /var/log/nginx/access.log -o threats.log

JSON Format

If you want to display the detected threats as JSON format, switch it with --json flag.

▶ teler -i /var/log/nginx/access.log --json

Please note this will also apply if you save it to a file with -o flag.

Remove Caches

It will removes all stored resources in the user-level cache directory, see cache.

▶ teler --rm-cache

Configuration

teler requires a minimum of configuration to process and/or log analysis, and execute threats and/or alerts. See teler.example.yaml for an example.

Log Formats

Because we use gonx package to parse the log, you can write any log format. As an example:

Apache

log_format: |
$remote_addr - $remote_user [$time_local] "$request_method $request_uri $request_protocol" $status $body_bytes_sent

Nginx

log_format: |
$remote_addr $remote_user - [$time_local] "$request_method $request_uri $request_protocol"
$status $body_bytes_sent "$http_referer" "$http_user_agent"

Nginx Ingress

log_format: |
$remote_addr - [$remote_addr] $remote_user - [$time_local]
"$request_method $request_uri $request_protocol" $status $body_bytes_sent
"$http_referer" "$http_user_agent" $request_length $request_time
[$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status $req_id

Amazon S3

log_format: |
$bucket_owner $bucket [$time_local] $remote_addr $requester $req_id $operationration $key
"$request_method $request_uri $request_protocol" $status $error_code $body_bytes_sent -
$total_time - "$http_referer" "$http_user_agent" $version_id $host_id
$signature_version $cipher_suite $http_auth_type $http_host_header $tls_version

Elastic LB

log_format: |
$time_local $elb_name $remote_addr $upstream_addr $request_processing_time
$upstream_processing_time $response_processing_time $status $upstream_status $body_received_bytes $body_bytes_sent
"$request_method $request_uri $request_protocol" "$http_user_agent" $cipher_suite $tls_version

CloudFront

log_format: |
$date $time $edge_location $body_bytes_sent $remote_addr
$request_method $http_host_header $requst_uri $status
$http_referer $http_user_agent $request_query $http_cookie $edge_type $req_id
$http_host_header $ssl_protocol $body_bytes_sent $response_processing_time $http_host_forwarded
$tls_version $cipher_suite $edge_result_type $request_protocol $fle_status $fle_encrypted_fields
$http_port $time_first_byte $edge_detail_result_type
$http_content_type $request_length $request_length_start $request_length_end

Threat rules

Cache

By default, teler will fetch external resources every time you run it, but you can switch external resources to be cached or not.

rules:
cache: true

If you choose to cache resources, it’s stored under user-level cache directory of cross-platform and will be updated every day, see resources.

Excludes

We include resources for predetermined threats, including:

  • Common Web Attack
  • Bad IP Address
  • Bad Referrer
  • Bad Crawler
  • Directory Bruteforce

You can disable any type of threat in the excludes configuration (case-sensitive).

rules:
threat:
excludes:
- "Bad IP Address"

The above format detects threats that are not included as bad IP address, and will not analyze logs/ send alerts for that type.

Whitelists

You can also add whitelists to teler configuration.

rules:
threat:
whitelists:
- "(curl|Go-http-client|okhttp)/*"
- "^/wp-login\.php"

It covers the entire HTTP request and processed as regExp, please write it with caution!

Notification

We provide alert notification options:

  • Slack,
  • Telegram
  • Discord

Configure the notification alerts needed on:

notifications:
slack:
token: "xoxb-..."
color: "#ffd21a"
channel: "G30SPKI"

telegram:
token: "123456:ABC-DEF1234...-..."
chat_id: "-111000"

discord:
token: "NkWkawkawkawkawka.X0xo.n-kmZwA8aWAA"
color: "16312092"
channel: "700000000000000..."

You can also choose to disable alerts or want to be sent where the alerts are.

alert:
active: true
provider: "slack"

Metrics

teler also supports metrics using Prometheus.

Prometheus

You can configure the host, port and endpoint to use Prometheus metrics in the configuration file.

prometheus:
active: true
host: "localhost"
port: 9099
endpoint: "/metrics"

Here are all the metrics we collected & categorized.

MetricDescription
teler_threats_count_totalTotal number of detected threats
teler_cwaGet lists of Common Web Attacks
teler_badcrawlerGet lists of Bad Crawler requests
teler_dir_bruteforceGet lists of Directories Bruteforced
teler_bad_referrerGet lists of Bad Referrer requests
teler_badip_countTotal number of Bad IP Addresses

Resources

All external resources used in this teler are NOT provided by us. See all peoples who involved in this resources at teler Resource Collections.

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