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Wade Simmons 949ec78653
don't set ConnectionState to nil (#590)
6 hours ago
.github/workflows Sign and notarize darwin universal binaries (#571) 4 weeks ago
cert Move util to test, contextual errors to util (#575) 4 weeks ago
cidr Rework some things into packages (#489) 1 month ago
cmd Move util to test, contextual errors to util (#575) 4 weeks ago
config Move util to test, contextual errors to util (#575) 4 weeks ago
dist Add Wintun support (#289) 4 weeks ago
e2e Rework some things into packages (#489) 1 month ago
examples tun_darwin (#163) 4 weeks ago
firewall Rework some things into packages (#489) 1 month ago
header Rework some things into packages (#489) 1 month ago
iputil Rework some things into packages (#489) 1 month ago
overlay overlay: fix tun.RouteFor getting *net.IP (#595) 10 hours ago
sshd Fix single command ssh exec (#483) 6 months ago
test Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 3 weeks ago
udp Rework some things into packages (#489) 1 month ago
util Move util to test, contextual errors to util (#575) 4 weeks ago
wintun fix `wintun` package to have // +build comments (#598) 6 days ago
.gitignore Support for 1.0.0 release 2 years ago
AUTHORS Public Release 2 years ago
CHANGELOG.md Warn if no lighthouses were configured on a non lighthouse node (#587) 6 days ago
LICENSE Public Release 2 years ago
Makefile Use CGO_ENABLED=0 (#421) 1 month ago
README.md docs: improve grammar and readability for README.md (#225) 4 weeks ago
allow_list.go Rework some things into packages (#489) 1 month ago
allow_list_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
bits.go Don't use a global logger (#423) 9 months ago
bits_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
cert.go Rework some things into packages (#489) 1 month ago
connection_manager.go Rework some things into packages (#489) 1 month ago
connection_manager_test.go Cleanup most of the remaining nits (#578) 3 weeks ago
connection_state.go Don't use a global logger (#423) 9 months ago
control.go Add Wintun support (#289) 4 weeks ago
control_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
control_tester.go Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 3 weeks ago
dns_server.go Rework some things into packages (#489) 1 month ago
dns_server_test.go Public Release 2 years ago
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firewall_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
go.mod update golang.org/x/crypto (#603) 6 hours ago
go.sum update golang.org/x/crypto (#603) 6 hours ago
handshake.go Rework some things into packages (#489) 1 month ago
handshake_ix.go Rework some things into packages (#489) 1 month ago
handshake_manager.go create ConnectionState before adding to HostMap (#535) 4 weeks ago
handshake_manager_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
hostmap.go don't set ConnectionState to nil (#590) 6 hours ago
hostmap_test.go Refactor remotes and handshaking to give every address a fair shot (#437) 8 months ago
inside.go Push route handling into overlay, a few more nits fixed (#581) 3 weeks ago
interface.go Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 3 weeks ago
lighthouse.go Fix race between punchback and lighthouse handler reset (#566) 1 month ago
lighthouse_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
logger.go Move util to test, contextual errors to util (#575) 4 weeks ago
main.go fix crash with `-test` (#602) 6 hours ago
message_metrics.go Rework some things into packages (#489) 1 month ago
metadata.go Public Release 2 years ago
nebula.pb.go More LH cleanup (#429) 8 months ago
nebula.proto More LH cleanup (#429) 8 months ago
noise.go Correct typos in noise.go (#205) 2 years ago
outside.go don't set ConnectionState to nil (#590) 6 hours ago
outside_test.go Rework some things into packages (#489) 1 month ago
punchy.go Rework some things into packages (#489) 1 month ago
punchy_test.go Move util to test, contextual errors to util (#575) 4 weeks ago
remote_list.go Rework some things into packages (#489) 1 month ago
remote_list_test.go Rework some things into packages (#489) 1 month ago
ssh.go create ConnectionState before adding to HostMap (#535) 4 weeks ago
stats.go Rework some things into packages (#489) 1 month ago
timeout.go Rework some things into packages (#489) 1 month ago
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timeout_test.go Rework some things into packages (#489) 1 month ago

README.md

What is Nebula?

Nebula is a scalable overlay networking tool with a focus on performance, simplicity and security. It lets you seamlessly connect computers anywhere in the world. Nebula is portable, and runs on Linux, OSX, Windows, iOS, and Android. It can be used to connect a small number of computers, but is also able to connect tens of thousands of computers.

Nebula incorporates a number of existing concepts like encryption, security groups, certificates, and tunneling, and each of those individual pieces existed before Nebula in various forms. What makes Nebula different to existing offerings is that it brings all of these ideas together, resulting in a sum that is greater than its individual parts.

Further documentation can be found here.

You can read more about Nebula here.

You can also join the NebulaOSS Slack group here.

Supported Platforms

Desktop and Server

Check the releases page for downloads or see the Distribution Packages section.

  • Linux - 64 and 32 bit, arm, and others
  • Windows
  • MacOS
  • Freebsd

Distribution Packages

  • Arch Linux
    $ sudo pacman -S nebula
    
  • Fedora Linux
    $ sudo dnf copr enable jdoss/nebula
    $ sudo dnf install nebula
    

Mobile

Technical Overview

Nebula is a mutually authenticated peer-to-peer software defined network based on the Noise Protocol Framework. Nebula uses certificates to assert a node's IP address, name, and membership within user-defined groups. Nebula's user-defined groups allow for provider agnostic traffic filtering between nodes. Discovery nodes allow individual peers to find each other and optionally use UDP hole punching to establish connections from behind most firewalls or NATs. Users can move data between nodes in any number of cloud service providers, datacenters, and endpoints, without needing to maintain a particular addressing scheme.

Nebula uses Elliptic-curve Diffie-Hellman (ECDH) key exchange and AES-256-GCM in its default configuration.

Nebula was created to provide a mechanism for groups of hosts to communicate securely, even across the internet, while enabling expressive firewall definitions similar in style to cloud security groups.

Getting started (quickly)

To set up a Nebula network, you'll need:

1. The Nebula binaries or Distribution Packages for your specific platform. Specifically you'll need nebula-cert and the specific nebula binary for each platform you use.

2. (Optional, but you really should..) At least one discovery node with a routable IP address, which we call a lighthouse.

Nebula lighthouses allow nodes to find each other, anywhere in the world. A lighthouse is the only node in a Nebula network whose IP should not change. Running a lighthouse requires very few compute resources, and you can easily use the least expensive option from a cloud hosting provider. If you're not sure which provider to use, a number of us have used $5/mo DigitalOcean droplets as lighthouses.

Once you have launched an instance, ensure that Nebula udp traffic (default port udp/4242) can reach it over the internet.

3. A Nebula certificate authority, which will be the root of trust for a particular Nebula network.

./nebula-cert ca -name "Myorganization, Inc"

This will create files named ca.key and ca.cert in the current directory. The ca.key file is the most sensitive file you'll create, because it is the key used to sign the certificates for individual nebula nodes/hosts. Please store this file somewhere safe, preferably with strong encryption.

4. Nebula host keys and certificates generated from that certificate authority

This assumes you have four nodes, named lighthouse1, laptop, server1, host3. You can name the nodes any way you'd like, including FQDN. You'll also need to choose IP addresses and the associated subnet. In this example, we are creating a nebula network that will use 192.168.100.x/24 as its network range. This example also demonstrates nebula groups, which can later be used to define traffic rules in a nebula network.

./nebula-cert sign -name "lighthouse1" -ip "192.168.100.1/24"
./nebula-cert sign -name "laptop" -ip "192.168.100.2/24" -groups "laptop,home,ssh"
./nebula-cert sign -name "server1" -ip "192.168.100.9/24" -groups "servers"
./nebula-cert sign -name "host3" -ip "192.168.100.10/24"

5. Configuration files for each host

Download a copy of the nebula example configuration.

  • On the lighthouse node, you'll need to ensure am_lighthouse: true is set.

  • On the individual hosts, ensure the lighthouse is defined properly in the static_host_map section, and is added to the lighthouse hosts section.

6. Copy nebula credentials, configuration, and binaries to each host

For each host, copy the nebula binary to the host, along with config.yaml from step 5, and the files ca.crt, {host}.crt, and {host}.key from step 4.

DO NOT COPY ca.key TO INDIVIDUAL NODES.

7. Run nebula on each host

./nebula -config /path/to/config.yaml

Building Nebula from source

Download go and clone this repo. Change to the nebula directory.

To build nebula for all platforms: make all

To build nebula for a specific platform (ex, Windows): make bin-windows

See the Makefile for more details on build targets

Credits

Nebula was created at Slack Technologies, Inc by Nate Brown and Ryan Huber, with contributions from Oliver Fross, Alan Lam, Wade Simmons, and Lining Wang.