97 lines
4.9 KiB
Markdown
97 lines
4.9 KiB
Markdown
# endlessh-go
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Golang implementation of [endlessh](https://nullprogram.com/blog/2019/03/22/) exporting Prometheus metrics.
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## Introduction
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Endlessh is a great idea that not only blocks the brute force SSH attacks, but also wastes attackers time as a kind of counter-attack. Besides trapping the attackers, I also want to virtualize the Geolocations and other statistics of the sources of attacks. Unfortunately the wonderful [C implementation of endlessh](https://github.com/skeeto/endlessh) only provides text based log, but I do not like the solution that writing extra scripts to parse the log outputs, then exporting the results to a dashboard, because it would introduce extra layers in my current setup and it would depend on the format of the text log file rather than some structured data. Thus I create this golang implementation of endlessh to export [Prometheus](https://prometheus.io/) metrics and a [Grafana](https://grafana.com/) dashboard to virtualize them.
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If you want a dashboard of sources of attacks and do not mind the endlessh server, besides trapping the attackers, does extra things including: translating IP to Geohash, exporting Prometheus metrics, and using more memory (about 10MB), this is the solution for you.
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## Getting Started
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Clone the repo then build from source:
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```
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go build .
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./endlessh-go
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```
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Alternatively, you can use the [docker image](https://hub.docker.com/r/shizunge/endlessh-go):
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```
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sudo docker run -d shizunge/endlessh-go
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```
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It listens to port `2222` by default.
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If you want log like the [C implementation](https://github.com/skeeto/endlessh), you need to set both CLI arguments `-logtostderr` and `-v=1`, then the log will go to the stderr. You can set different log destinations via CLI arguments.
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## Usage
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Usage of `./endlessh-go`
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* -alsologtostderr
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* log to standard error as well as files
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* -conn_type string
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* Connection type. Possible values are tcp, tcp4, tcp6 (default "tcp")
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* -enable_prometheus
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* Enable prometheus
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* -geoip_supplier string
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* Supplier to obtain Geohash of IPs. Possible values are "off", "ip-api", "freegeoip" (default "off")
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* -host string
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* Listening address (default "0.0.0.0")
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* -interval_ms int
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* Message millisecond delay (default 1000)
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* -line_length int
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* Maximum banner line length (default 32)
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* -log_backtrace_at value
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* when logging hits line file:N, emit a stack trace
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* -log_dir string
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* If non-empty, write log files in this directory
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* -logtostderr
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* log to standard error instead of files
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* -max_clients int
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* Maximum number of clients (default 4096)
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* -port string
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* Listening port (default "2222")
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* -prometheus_entry string
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* Entry point for prometheus (default "metrics")
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* -prometheus_port string
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* The port for prometheus (default "2112")
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* -stderrthreshold value
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* logs at or above this threshold go to stderr
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* -v value
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* log level for V logs
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* -vmodule value
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* comma-separated list of pattern=N settings for file-filtered logging
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## Metrics
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This golang implementation exports the following Prometheus metrics.
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| Metric | Type | Description |
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|--------------------------------------|-------|--------------|
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| endlessh_client_open_count_total | count | Total number of clients that tried to connect to this host. |
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| endlessh_client_closed_count_total | count | Total number of clients that stopped connecting to this host. |
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| endlessh_sent_bytes_total | count | Total bytes sent to clients that tried to connect to this host. |
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| endlessh_trapped_time_seconds_total | count | Total seconds clients spent on endlessh. |
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| endlessh_client_open_count | count | Number of connections of clients. <br> Labals: <br> <ul><li> `ip`: IP of the client </li> <li> `country`: Country of the IP </li> <li> `location`: Country, Region, and City </li> <li> `geohash`: Geohash of the location </li></ul> |
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| endlessh_client_trapped_time_seconds | count | Seconds a client spends on endlessh. <br> Labals: <br> <ul><li> `ip`: IP of the client </li></ul> |
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The metrics is off by default, you can turn it via the CLI argument `-enable_prometheus`.
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It listens to port `2112` and entry point is `/metrics` by default. The port and entry point can be changed via CLI arguments.
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The endlessh-go server stores the geohash of attackers as a label on `endlessh_client_open_count`, which is also off by default. You can turn it on via the CLI argument `-geoip_supplier`. The endlessh-go uses service from either [ip-api](https://ip-api.com/) or [freegeoip](https://freegeoip.live/), which may enforce a query rate and limit commercial use. Visit their website for their terms and policies.
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## Dashboard
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The dashboard requires Grafana 8.2.
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You can import the dashboard from Grafana.com using ID [15156](https://grafana.com/grafana/dashboards/15156)
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The IP addresses are clickable and link you to the [ARIN](https://www.arin.net/) database.
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