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Wade Simmons e434ba6523
fix unsafe routes darwin (#610)
With Nebula 1.4.0, if you create an unsafe_route that has a collision with an existing route on the system, the unsafe_route will be silently dropped (and the existing system route remains).

With Nebula 1.5.0, this same situation will cause Nebula to fail to start with an error (EEXIST).

This change restores the Nebula 1.4.0 behavior (but with a WARN log as well).
2021-12-14 11:52:49 -05:00
.github/workflows Sign and notarize darwin universal binaries (#571) 2021-11-09 10:49:54 -06:00
cert Allow setup of a CA pool from bytes that contain expired certs (#599) 2021-12-09 21:24:56 -06:00
cidr Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
cmd Be more clear about ipv4 in nebula-cert (#604) 2021-12-07 21:40:30 -06:00
config Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
dist Add Wintun support (#289) 2021-11-08 12:36:31 -06:00
e2e Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
examples tun_darwin (#163) 2021-11-09 20:24:24 -05:00
firewall Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
header Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
iputil Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
overlay fix unsafe routes darwin (#610) 2021-12-14 11:52:49 -05:00
sshd Fix single command ssh exec (#483) 2021-06-07 17:06:59 -05:00
test Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 2021-11-12 12:47:09 -06:00
udp Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
util Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
wintun fix `wintun` package to have // +build comments (#598) 2021-11-30 11:14:15 -05:00
.gitignore Support for 1.0.0 release 2019-11-19 10:31:59 -08:00
AUTHORS Public Release 2019-11-19 17:00:20 +00:00
CHANGELOG.md v1.5.1 (#606) 2021-12-13 20:43:25 -05:00
LICENSE Public Release 2019-11-19 17:00:20 +00:00
Makefile Use CGO_ENABLED=0 (#421) 2021-11-04 14:20:44 -04:00
README.md docs: improve grammar and readability for README.md (#225) 2021-11-08 17:32:31 -06:00
allow_list.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
allow_list_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
bits.go Don't use a global logger (#423) 2021-03-26 09:46:30 -05:00
bits_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
cert.go Allow setup of a CA pool from bytes that contain expired certs (#599) 2021-12-09 21:24:56 -06:00
connection_manager.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
connection_manager_test.go Cleanup most of the remaining nits (#578) 2021-11-12 10:47:36 -06:00
connection_state.go Don't use a global logger (#423) 2021-03-26 09:46:30 -05:00
control.go Add Wintun support (#289) 2021-11-08 12:36:31 -06:00
control_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
control_tester.go Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 2021-11-12 12:47:09 -06:00
dns_server.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
dns_server_test.go Public Release 2019-11-19 17:00:20 +00:00
firewall.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
firewall_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
go.mod update golang.org/x/crypto (#603) 2021-12-06 14:07:05 -05:00
go.sum update golang.org/x/crypto (#603) 2021-12-06 14:07:05 -05:00
handshake.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
handshake_ix.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
handshake_manager.go create ConnectionState before adding to HostMap (#535) 2021-11-08 14:46:22 -05:00
handshake_manager_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
hostmap.go don't set ConnectionState to nil (#590) 2021-12-06 14:09:05 -05:00
hostmap_test.go Refactor remotes and handshaking to give every address a fair shot (#437) 2021-04-14 13:50:09 -05:00
inside.go Push route handling into overlay, a few more nits fixed (#581) 2021-11-12 11:19:28 -06:00
interface.go Remove WriteRaw, cidrTree -> routeTree to better describe its purpose, remove redundancy from field names (#582) 2021-11-12 12:47:09 -06:00
lighthouse.go Fix race between punchback and lighthouse handler reset (#566) 2021-11-03 21:54:27 -05:00
lighthouse_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
logger.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
main.go fix crash with `-test` (#602) 2021-12-06 14:06:16 -05:00
message_metrics.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
metadata.go Public Release 2019-11-19 17:00:20 +00:00
nebula.pb.go More LH cleanup (#429) 2021-04-01 10:23:31 -05:00
nebula.proto More LH cleanup (#429) 2021-04-01 10:23:31 -05:00
noise.go Correct typos in noise.go (#205) 2020-03-30 11:23:55 -07:00
outside.go don't set ConnectionState to nil (#590) 2021-12-06 14:09:05 -05:00
outside_test.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
punchy.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
punchy_test.go Move util to test, contextual errors to util (#575) 2021-11-10 21:47:38 -06:00
remote_list.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
remote_list_test.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
ssh.go create ConnectionState before adding to HostMap (#535) 2021-11-08 14:46:22 -05:00
stats.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
timeout.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
timeout_system.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
timeout_system_test.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00
timeout_test.go Rework some things into packages (#489) 2021-11-03 20:54:04 -05:00

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.