https://github.com/opsdisk/scantron

A distributed nmap / masscan scanning framework complete with scan scheduling, engine pooling, subsequent scan port diff-ing, and an API client for automation workflows.
https://github.com/opsdisk/scantron

Last synced: 24 days ago
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A distributed nmap / masscan scanning framework complete with scan scheduling, engine pooling, subsequent scan port diff-ing, and an API client for automation workflows.

• Host: GitHub
• URL: https://github.com/opsdisk/scantron
• Owner: opsdisk
• License: apache-2.0
• Fork: true (rackerlabs/scantron)
• Created: 2021-08-11T15:14:27.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2022-01-17T23:27:32.000Z (over 2 years ago)
• Last Synced: 2024-02-16T03:35:41.589Z (4 months ago)
• Language: Python
• Homepage:
• Size: 15.8 MB
• Stars: 146
• Watchers: 4
• Forks: 27
• Open Issues: 9
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Lists

• awesome-stars - opsdisk/scantron - A distributed nmap / masscan scanning framework complete with scan scheduling, engine pooling, subsequent scan port diff-ing, and an API client for automation workflows. (Python)
• awesome-stars - opsdisk/scantron - A distributed nmap / masscan scanning framework complete with scan scheduling, engine pooling, subsequent scan port diff-ing, and an API client for automation workflows. (Python)
• awesome-hacking-lists - opsdisk/scantron - A distributed nmap / masscan scanning framework complete with scan scheduling, engine pooling, subsequent scan port diff-ing, and an API client for automation workflows. (Python)

README

        


    This project has been forked and will be maintained here:

    


    


    https://github.com/opsdisk/scantron



# Scantron

![logo](./console/django_scantron/static/scantron/img/scantron_300x300.jpg)









## Overview

Scantron is a distributed nmap and masscan scanner comprised of two components.  The first is a console node that

consists of a web front end used for scheduling scans and storing scan targets and results.  The second component is an

engine that pulls scan jobs from the console and conducts the actual scanning.  A majority of the application's logic is

purposely placed on the console to make the engine(s) as "dumb" as possible.  All scan target files and scan results

reside on the console and are shared through a network file share (NFS) leveraging SSH tunnels.  The engines call back

to the console periodically using a REST API to check for scan tasks and provide scan status updates.  There is also an

option to generate nmap scan diffs emailed to you using the [pyndiff](https://github.com/rackerlabs/pyndiff) library.

Checkout the Python [Scantron API client](https://github.com/rackerlabs/scantron/tree/master/scantron_api_client) for

interacting with the Scantron API and driving automated workflows.

![scheduled_scans](./img/scheduled_scans.png)

Scantron is coded for Python3.6+ exclusively and leverages Django for the web front-end, Django REST Framework as the

API endpoint, PostgreSQL as the database, a Redis job queue for tasks, Postfix for email scan alerts, and comes complete

with Ubuntu-focused Ansible playbooks for smooth deployments.  Scantron has been tested on Ubuntu 18.04 and may be

compatible with other operating systems.  Scantron's inspiration comes from:

* [dnmap](https://sourceforge.net/projects/dnmap/)

* [Minions](https://github.com/sixdub/Minions)

* [rainmap svn](https://svn.nmap.org/rainmap/) / [rainmap github](https://github.com/axtl/rainmap)

* [rainmap-lite](https://github.com/cldrn/rainmap-lite)

![results](./img/results.png)

Scantron relies heavily on utilizing SSH port forwards (-R / -L) as an umbilical cord to the engines.  Either an SSH

connection from `console --> engine` or `engine --> console` is acceptable and may be required depending on different

firewall rules, but tweaking the port forwards and autossh commands will be necessary.  If you are unfamiliar with these

concepts, there are some great overviews and tutorials out there:

* 

* 

* 

## Use cases

Scantron is not engineered to be quickly deployed to a server to scan for a few minutes, then torn down and destroyed.  

It's better suited for having a set of static scanners (e.g., "internal-scanner", "external-scanner") with a relatively

static set of assets to scan.

A [Scantron API client](https://github.com/rackerlabs/scantron/tree/master/scantron_api_client) is also available for

creating, retrieving, updating, or deleting sites, scan commands, scans, etc.

## Architecture Diagram

![scantron_architecture_overview](./img/scantron_architecture_overview.png)

## Hardware Requirements

* Engine: If you plan on compiling masscan on an engine, you'll need at least 1024 MB of memory.  It fails to build with

only 512 MB.  If you do not want to build masscan, set `install_masscan_on_engine` to `False` in

`ansible-playbooks/group_vars/all.yml`

* Console: 512 MB of memory was the smallest amount successfully tested, however, if you plan on processing large scan

files (using the scripts found in `console/scan_results`: `masscan_json_to_csv.py`, `nmap_to_csv.py` or

`xml_to_json_nmap_results.py`), you'll need more memory.

## Ansible Deployment Server and Initial Setup

This is your local box, preferably Linux.  Ansible >= 2.4.0.0 is the minimum version required for utilizing ufw comments.

Clone the project and execute `initial_setup.sh`.

```bash

# Clone scantron project.

git clone https://github.com/rackerlabs/scantron.git

cd scantron

./initial_setup.sh  # Run as non-root user.

```

## Installation

Installation requires a general knowledge of Python, pip, and Ansible.  Every attempt to make the deployment as simple

as possible has been made.

### Cloud Provider Caveats

#### NAT'd instances

If the console server is actually a RFC1918 IP and not the public IP (because of NAT), the NAT'd RFC1918 IP

(e.g., 10.1.1.2) will have to be added to the `ALLOWED_HOSTS` in

`ansible-playbooks/roles/console/templates/production.py.j2`

This is common in AWS and GCP environments.

#### IBM Cloud

Per :  For the Ansible workload to work on IBM Cloud, edit the file `/boot/grub/menu.lst`

by changing

```bash

# groot=LABEL...

```

to

```bash

# groot=(hd0)

```

### Update hosts

Edit the hosts in this file:

* `ansible-playbooks/hosts.ini`

### Console Installation

The recommendation is to deploy the console first.  

#### Update Console Ansible Variables

Edit any variables in `ansible-playbooks/group_vars/all.yml` before running playbook.  Note the time zone variables:

* `timezone_server` - Set this to be the timezone you want the server to be in, usually UTC.

* `timezone_django` - Set this to be your local timezone.  It makes dealing with dates, times, and scheduling easier.

If you plan on utilizing the same API key across all engines (not recommended, but easier for automated deployments),

change `utilize_static_api_token_across_engines` to `True`.  This prevents you from having to log into each engine and

update `engine_config.json` with the corresponding API key.  The `group_vars/static_api_key` will be created by the

the console ansible playbook.  The Ansible engine playbook will autofill the `engine_config.json.j2` template with the

API key found in `group_vars/static_api_key`.

**WARNING**: The `engine_config.json.j2` will generate a random `scan_engine` (e.g., `engine-847623`), so if you deploy

more than 1 engine, you won't run into complications with engine name collisions.  You will, however, need to add create

the user on the console, since the console returns scheduled jobs to the engine based off the engine's name!

#### Update Console Secrets Variables

Rename `console/scantron_secrets.json.empty` to `console/scantron_secrets.json` (should be done for you by

`initial_setup.sh`)

Update all the values `console/scantron_secrets.json` if you do not like ones generated using `initial_setup.sh`.  Only

the `production` values are used.

* All Scantron Django passwords have a minimum password length of 12.

* For the "SECRET_KEY", per Django's

[documentation](): The secret key must be

a large random value and it must be kept secret.

#### Change scantron user password (optional)

The `scantron` operating system user password is not really leveraged and is populated by providing a salted hash of a

random password generated using Python's `passlib` library.  If you want to change the password, you will have to

generate a hash for the desired password and update the `temp_user_pass` variable in

`scantron/ansible-playbooks/roles/add_users/vars/main.yml`.

```python

pip3 install passlib

python3 -c "from passlib.hash import sha512_crypt; import getpass; print(sha512_crypt.encrypt(getpass.getpass()))"

```

#### Execute Console Ansible Playbook

Ensure you have a SSH key (or username/password) to access the console box, specified by `--private-key` in the Ansible

command.  User must also have password-less sudo privileges.

```bash

cd ansible-playbooks

# non-root user with password-less sudo capabilities.

ansible-playbook console.yml -u ubuntu --become --private-key=

# root user.

ansible-playbook console.yml -u root --private-key=

```

#### Change Django user passwords with manage.py (optional)

cd into the console directory `scantron/console` and run the following to change the `admin` (or whatever user needs

their password changed) user password.

```bash

python3 manage.py changepassword admin

```

### Engine Installation

#### Update Engine Ansible Variables

Edit any variables in these files before running playbook:

* `ansible-playbooks/group_vars/all.yml`

* `ansible-playbooks/roles/engine/vars/main.yml`

#### Ensure proper user permissions

Ensure you have a SSH key (or username/password) to access the engine box, specified by `--private-key` in the Ansible

command.  The user **must** also have password-less sudo privileges.  If you are creating the boxes on AWS, then the

user is `ubuntu` for Ubuntu distros and the user already has password-less sudo capabilities.  If you need to add

password-less sudo capability to a user, create a `/etc/sudoder.d/` file, where `` is the actual

user, and populate it with:

```bash

 ALL=(ALL) NOPASSWD: ALL

```

SSH-ing in as `root` will also work for the Ansible deployment, but is not generally recommended.

#### Execute Engine Ansible Playbook

```bash

cd ansible-playbooks

# non-root user with password-less sudo capabilities.

ansible-playbook engine.yml -u ubuntu --become --private-key=

# root user.

ansible-playbook engine.yml -u root --private-key=

```

## Adding additional engines

A Scantron engine is synonymous with a user.

```none

engines <--> users

```

Users / engines are added through the webapp, so once a user / engine is added, an API token is automatically generated

for that user / engine.  The user's / engine's password is not necessary for Scantron to function since all user /

engine authentication is done using the API token.  The username and password can be used to login to the webapp to test

API functionality.  More API testing information can be found in the **Test Engine API** section of this README.

### Update /etc/rc.local with engine IPs for autossh

This is done automatically for one engine through Ansible.  You may have to add additional lines and update SSH keys for

each engine if they are different.  These commands are for the console connecting to the engines.  

In this example:

* console - 192.168.1.99

* engine1 - 192.168.1.100

* engine2 - 192.168.1.101

```bash

# console --> engine 1

su - autossh -s /bin/bash -c 'autossh -M 0 -f -N -o "StrictHostKeyChecking no" -o "ServerAliveInterval 60" \

    -o "ServerAliveCountMax 3" -p 22 -R 4430:127.0.0.1:443 -R 2049:127.0.0.1:2049 \

    -i /home/scantron/console/autossh.key [email protected]'

# console --> engine 2

su - autossh -s /bin/bash -c 'autossh -M 0 -f -N -o "StrictHostKeyChecking no" -o "ServerAliveInterval 60" \

    -o "ServerAliveCountMax 3" -p 22 -R 4430:127.0.0.1:443 -R 2049:127.0.0.1:2049 \

    -i /home/scantron/console/autossh.key [email protected]'

```

If the console cannot SSH to an engine, then the autossh command will be run on the engine and the port forwards will be

local (`-L`) instead of remote (`-R`).

```bash

# console <-- engine 1

su - autossh -s /bin/bash -c 'autossh -M 0 -f -N -o "StrictHostKeyChecking no" -o "ServerAliveInterval 60" \

    -o "ServerAliveCountMax 3" -p 22 -L 4430:127.0.0.1:443 -L 2049:127.0.0.1:2049 \

    -i /home/scantron/console/autossh.key [email protected]'

```

## Engines

### Engine's engine_config.json

`engine_config.json` is a configuration file used by engines to provide basic settings and bootstrap communication with

the console.  Each engine can have a different configuration file.  

```none

The "api_token" will have to be modified on all the engines after deploying the console!

```

Engine settings:

**scan_engine:** Name of the engine.  This name is also used in the engine's HTTP `User-Agent` string to help identify

engines calling back in the nginx web logs.

**api_token:** Used to authenticate engines.  Recommend different API Tokens per engine, but the same one could be used.

**console_address:** Web address of the console.  Could be 127.0.0.1 if engine traffic is tunneled to the console

through an SSH port forward.

**console_port:** Web port the console is listening on.

**callback_interval_in_seconds:** Number of seconds engines wait before calling back for scan jobs.

**number_of_threads:** Number of threads used to execute/kill scan jobs.

**target_files_dir:** Name of actual engine `target_files` directory on the engine box.

**scan_results_dir:** Name of actual engine `scan_results` directory on the engine box.

**log_verbosity:** Desired log level for logs/engine.log

```bash

# Level     Numeric value

# CRITICAL  50

# ERROR     40

# WARNING   30

# INFO      20

# DEBUG     10

```

**http_useragent:** HTTP User-Agent used instead of nmap's default

`Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)`.

**supported_scan_binaries** Experimental.  Supported scan binaries advertised by the engine.

### Standalone Engine Binary

This repo also contains a stand-alone binary `engine/engine` that can be used for the engine.  This

allows for a quicker deployment if managing the Python environment is difficult or cumbersome.  The basic requirements

are:

* `nmap` and `masscan` must exist on the system

* the `engine_config.json` file exists and the `scan_engine` and `api_token` values have been updated

* An SSH tunnel to/from the console still exists to read target files and write scan results

#### Creating the standalone binary

The standalone binaries can be generated on a local box.

```bash

cd engine

virtualenv -p python3.6 .venv

source .venv/bin/activate

pip install pyinstaller

pyinstaller --onefile engine.py --name engine

mv dist/engine .

./engine -v > standalone_engine_binary.txt

echo -e "MD5     `md5sum engine`" >> standalone_engine_binary.txt

echo -e "SHA-256 `sha256sum engine`" >> standalone_engine_binary.txt

rm -rf __pycache__ build dist engine.spec .venv

```

### Engine Execution

Update all the engines' `engine_config.json` files with their respective `api_token` for the engine by logging in as

`admin` and browsing to `https:///scantron-admin/authtoken/token` to see the corresponding API token for each

user / engine.

#### Option 1: Run engine as a service

Enable scantron-engine service at startup.

```bash

systemctl daemon-reload  # Required if scantron-engine.service changed.

systemctl enable scantron-engine

```

Disable scantron-engine service at startup.

```bash

systemctl disable scantron-engine

```

Scantron service troubleshooting commands.

```bash

systemctl status scantron-engine

systemctl start scantron-engine

systemctl stop scantron-engine

systemctl restart scantron-engine

```

#### Option 2: Run engine as standalone script

Use `screen` to avoid the script dying after disconnecting through SSH.

```bash

screen -S engine1  # Create a screen session and name it engine1, if using screen.

cd engine

source .venv/bin/activate

# Option 1: Python virtual environment

python engine.py -c engine_config.json

# Option 2: Stand alone binary

./engine -c engine_config.json

CTRL + a + d  # Break out of screen session, if using screen.

screen -ls  # View screen job, if using screen.

screen -r engine1  # Resume named screen session, if using screen.

```

### Engine Troubleshooting

Verify SSH connection from the console with reverse port redirect is up on each engine.  Any traffic hitting

127.0.0.1:4430 will be tunneled back to the console.  This port is for communicating with the API.  Any traffic hitting

127.0.0.1:2049 will connect back to the NFS share on the console.

```bash

tcp    0    0 127.0.0.1:4430    0.0.0.0:*    LISTEN    1399/sshd: autossh

tcp    0    0 127.0.0.1:2049    0.0.0.0:*    LISTEN    1399/sshd: autossh

```

Check each engine's root crontab to ensure `nfs_watcher.sh` is being run every minute.

```bash

crontab -l -u root

```

### Test Engine API

If you need to test the API without running the engine, ensure there is a "pending" scan set to start earlier than the

current date and time.  The server only returns scan jobs that have a "pending" status and start datetime earlier than

the current datetime.

```bash

# Not using SSH tunnels.

curl -k -X GET -H 'Authorization: Token ' https://192.168.1.99:443/api/scheduled_scans

# Using SSH tunnels.

curl -k -X GET -H 'Authorization: Token ' https://127.0.0.1:4430/api/scheduled_scans

```

You can also log into the webapp using the engine name and password and browse to `/api/?format=json` to view any scan

jobs.  The username and engine name are the same from the webapp's point of view.

## Console

### Console `target_files` Folder

* Place files with target IPs/hosts (fed to nmap `-iL` switch) in `console/target_files/`

* `target_files` is an NFS share on the console that the engine reads from through an SSH tunnel.

### Console `scan_results` folder

* nmap scan results from engines go here.

* `console/scan_results/` is an NFS share on the console that the engine writes to through an SSH tunnel.

### Console Troubleshooting

1). Ensure SSH tunnels setup in `/etc/rc.local` are up.

```bash

netstat -nat | egrep "192.168.1.100|192.168.1.101"

ps -ef | egrep autossh

```

2). Django logs can be found here: `/var/log/webapp/django_scantron.log`

3). Check nginx logs for engine name in User-Agent field to determine which engines are calling home.

nginx logs: `tail -f /var/log/nginx/{access,error}.log`

4). uwsgi logs: `/home/scantron/console/logs`

### Known issues with the console NFS share

If you need to reboot a box, do it with the provided `clean_reboot.sh` script that will stop all relevant services.

Without stopping the `nfs-kernel-server` service gracefully, sometimes the OS will hang and get angry.

## Email Alerts

A vanilla Postfix instance is installed on the console that can be used to send email alerts when a scan starts, errors

out, or finishes.  Email settings and credentials are kept in the `scantron_secrets.json` file.  Out of the box, most

mail will likely be marked as spam/junk.  The recommendation is to use a credentialed account to send email alerts to

users.

## Miscellaneous

### Updating nmap version

Ubuntu's nmap version pulled using `apt` is fairly out-of-date and the recommendation for Scantron's engines is to pull

the latest version.

For RPM-based Distributions, the latest `.rpm` packages can be found here .  However,

for Debian-based distributions, you must utilize `alien` to convert the `.rpm` to a `.deb` file

 or compile from source.  Recommend going down the `alien` route before compiling

from source.

#### alien

```bash

VERSION=7.70-1  # CHANGE THIS TO LATEST VERSION

apt install alien -y

wget https://nmap.org/dist/nmap-$VERSION.x86_64.rpm

alien nmap-$VERSION.x86_64.rpm

apt remove nmap -y

apt remove ndiff -y

dpkg --install nmap_*.deb

```

#### Compile nmap from source

Another option is to compile nmap from source.  This is dynamically compiled and must be done on the box where nmap is

going to be run from.  Note that past experience had a compiled nmap version returning a different banner than the

provided apt version...so your mileage may vary.

```bash

VERSION=7.70-1  # CHANGE THIS TO LATEST VERSION

wget https://nmap.org/dist/nmap-$VERSION.tar.bz2

bzip2 -cd nmap-$VERSION.tar.bz2 | tar xvf -

cd nmap-$VERSION

./configure --without-ncat --without-ndiff --without-nmap-update --without-nping --without-subversion \

--without-zenmap --with-libdnet=included --with-libpcap=included --with-libpcre=included

make

./nmap -V

```

### Get nmap --top-ports

This provides a list of the actual ports being scanned when the `--top-ports` option is used:

```bash

# TCP

nmap -sT --top-ports 1000 -v -oG -

# UDP

nmap -sU --top-ports 1000 -v -oG -

```

Sorted list based on frequency.

```bash

# TCP sorted list based on frequency.

egrep /tcp /usr/share/nmap/nmap-services | sort -r -k3

# UDP sorted list based on frequency.

egrep /udp /usr/share/nmap/nmap-services | sort -r -k3

```

Source: 

## nmap_port_range_carver

A standalone [script](https://github.com/rackerlabs/scantron/tree/master/nmap_port_range_carver) to carve out a range

of the top TCP/UDP ports according to the nmap-services file.

This is useful when:

1. You want to scan a subset of the ports specified in `--top-ports`, say the 10th through 20th top TCP ports, but not

the 1st or 9th ports.

2. You want the 1337th ranked TCP port.

3. You want to utilize nmap to scan **both** TCP and UDP, but not scan the same number of top ports.

    This works and will scan the top 10 ports for BOTH TCP and UDP

    ```bash

    nmap --top-ports 10 -sU -sT 

    ```

    but you can't only scan the top 20 TCP and top 10 UDP ports using `--top-ports`.

## Workflow

1. Create user/engine.  By default, Ansible creates `engine1`.

    ![create_user_engine](./img/create_user_engine.png)

2. Create scan command

    ![create_nmap_command](./img/create_nmap_command.png)

3. Create a site

    * IPs, IP subnets, and FQDNs are allowed.

    * IP ranges (`192.168.1.0-10`) are not currently supported.

    * The targets and excluded_targets are validated using `console/extract_targets.py`, which can also be used as a

      stand alone script.

    ![create_site](./img/create_site.png)

4. Create scan

    * Select start time

    * Add start date

    * Add recurrence rules (if applicable)

    The `/home/scantron/console/scan_scheduler.sh` cronjob checks every minute to determine if any scans need to be

    queued.  If scans are found, it schedules them to be picked up by the engines.

    ![create_scan](./img/create_scan.png)

    You can use the `console/scan_scheduler_visualizer.py` script found on the console to print out scheduled scan

    times:

    ```bash

    # Print out the scan start dates and times for all enabled scans in the next 10 days.

    cd /home/scantron/console

    source .venv/bin/activate

    python scan_scheduler_visualizer.py -d 10

    ```

5. View currently executing scan results

    ```bash

    cd /home/scantron/console/scan_results/pending

    ls -lart

    ```

    Completed scans are moved to the `/home/scantron/console/scan_results/completed` directory.

6. Process scans

    Scan files are moved between a few folders.

    `/home/scantron/console/scan_results/pending` - Pending scan files from engines are stored here before being moved

    to `scan_results/complete`

    `/home/scantron/console/scan_results/complete` - Completed scan files from engines are stored here before being

    processed by `nmap_to_csv.py`

    `/home/scantron/console/scan_results/processed` - nmap scan files already processed by `nmap_to_csv.py` reside here.

    `/home/scantron/console/for_bigdata_analytics` - .csv files for big data analytics ingestion if applicable

## Scantron API Client

Checkout the Python [Scantron API client](https://github.com/rackerlabs/scantron/tree/master/scantron_api_client) for

interacting with the Scantron API and driving automated workflows.

## API Documentation

There are 3 ways to explore and play around with the API.  The first is the Django REST Framework view:

![api_django_rest_framework](./img/api_django_rest_framework.png)

You can also dig through the API documentation using ReDoc:

![api_redoc](./img/api_redoc.png)

Lastly, you can interact with the API using Swagger:

![api_swagger](./img/api_swagger.png)

## Database Model Graph

Generated using `django-extensions`'s graph_models.

![database_graph_model](./scantron_model_graph.png)

## Contributing

If you would like to contribute, please adhere to the Python code black formatter rules specifying a line length of 120.

More information about black can be found here ()

## Robot Image

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