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forfuncsake 2e5a477a50
Align linux UDP performance optimizations with configuration (#275)
* Remove unused (*udpConn).Read method

* Align linux UDP performance optimizations with configuration

While attempting to run nebula on an older Synology NAS, it became
apparent that some of the performance optimizations effectively
block support for older kernels. The recvmmsg syscall was added in
linux kernel 2.6.33, and the Synology DS212j (among other models)
is pinned to 2.6.32.12.

Similarly, SO_REUSEPORT was added to the kernel in the 3.9 cycle.
While this option has been backported into some older trees, it
is also missing from the Synology kernel.

This commit allows nebula to be run on linux devices with older
kernels if the config options are set up with a single listener
and a UDP batch size of 1.
2020-08-13 08:24:05 +10:00
.github/workflows Use Go 1.15 (#277) 2020-08-12 16:16:21 -04:00
cert Use inclusive terminology for cert blocking (#272) 2020-08-06 11:17:47 +10:00
cmd enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
dist Start nebula after the network is up (#270) 2020-08-07 11:33:48 -05:00
examples Support startup without a tun device (#269) 2020-08-10 09:15:55 -04:00
sshd enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
.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 v1.2.0 (#215) 2020-04-08 19:52:24 -04:00
LICENSE Public Release 2019-11-19 17:00:20 +00:00
Makefile mips-softfloat (#231) 2020-06-26 13:46:23 -04:00
README.md add new invite link without expiration date (#165) 2020-01-16 10:09:45 -06:00
allow_list.go Add lighthouse.{remoteAllowList,localAllowList} (#217) 2020-04-08 15:36:43 -04:00
allow_list_test.go Add lighthouse.{remoteAllowList,localAllowList} (#217) 2020-04-08 15:36:43 -04:00
bits.go Public Release 2019-11-19 17:00:20 +00:00
bits_test.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
cert.go Use inclusive terminology for cert blocking (#272) 2020-08-06 11:17:47 +10:00
cidr_radix.go Add a way to find the most specific network 2019-12-09 16:28:58 -08:00
cidr_radix_test.go Add a way to find the most specific network 2019-12-09 16:28:58 -08:00
config.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
config_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
connection_manager.go log `certName` alongside `vpnIp` (#200) 2020-04-06 11:34:00 -07:00
connection_manager_test.go add meta packet statistics (#230) 2020-06-26 13:45:48 -04:00
connection_state.go Public Release 2019-11-19 17:00:20 +00:00
dns_server.go Allow configuration of dns listener host/port (#74) 2019-12-11 17:42:55 -08:00
dns_server_test.go Public Release 2019-11-19 17:00:20 +00:00
firewall.go Preserve conntrack table during firewall rules reload (SIGHUP) (#233) 2020-07-31 18:53:36 -04:00
firewall_test.go Preserve conntrack table during firewall rules reload (SIGHUP) (#233) 2020-07-31 18:53:36 -04:00
go.mod update golang.org/x/crypto (#188) 2020-02-20 14:49:55 -05:00
go.sum update golang.org/x/crypto (#188) 2020-02-20 14:49:55 -05:00
handshake.go fix config name for {remote,local}_allow_list (#219) 2020-04-08 16:20:12 -04:00
handshake_ix.go log remote certificate fingerprint on handshakes (#262) 2020-07-31 18:54:51 -04:00
handshake_manager.go fix fast handshake trigger for static hosts (#265) 2020-08-02 20:59:50 -04:00
handshake_manager_test.go trigger handshakes when lighthouse reply arrives (#246) 2020-07-22 10:35:10 -04:00
header.go Public Release 2019-11-19 17:00:20 +00:00
header_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
hostmap.go add meta packet statistics (#230) 2020-06-26 13:45:48 -04:00
hostmap_test.go allow `go test -bench=.` to run (#234) 2020-05-27 16:52:34 -04:00
inside.go drop unroutable packets (#267) 2020-08-04 22:59:04 -04:00
interface.go Preserve conntrack table during firewall rules reload (SIGHUP) (#233) 2020-07-31 18:53:36 -04:00
lighthouse.go trigger handshakes when lighthouse reply arrives (#246) 2020-07-22 10:35:10 -04:00
lighthouse_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
logger.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
logger_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
main.go Support startup without a tun device (#269) 2020-08-10 09:15:55 -04:00
main_test.go Public Release 2019-11-19 17:00:20 +00:00
message_metrics.go add meta packet statistics (#230) 2020-06-26 13:45:48 -04:00
metadata.go Public Release 2019-11-19 17:00:20 +00:00
nebula.pb.go Public Release 2019-11-19 17:00:20 +00:00
nebula.proto Public Release 2019-11-19 17:00:20 +00:00
noise.go Correct typos in noise.go (#205) 2020-03-30 11:23:55 -07:00
outside.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
outside_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
punchy.go add configurable punching delay because of race-condition-y conntracks (#210) 2020-03-27 11:26:39 -07:00
punchy_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
ssh.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
stats.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
timeout.go Public Release 2019-11-19 17:00:20 +00:00
timeout_system.go Public Release 2019-11-19 17:00:20 +00:00
timeout_system_test.go Public Release 2019-11-19 17:00:20 +00:00
timeout_test.go enforce the use of goimports (#248) 2020-06-30 18:53:30 -04:00
tun_android.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
tun_common.go unsafe_routes mtu (#209) 2020-04-06 11:33:30 -07:00
tun_darwin.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
tun_disabled.go Support startup without a tun device (#269) 2020-08-10 09:15:55 -04:00
tun_freebsd.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
tun_ios.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
tun_linux.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
tun_linux_test.go linux: set advmss correctly when route MTU is used (#245) 2020-06-26 13:47:21 -04:00
tun_test.go unsafe_routes mtu (#209) 2020-04-06 11:33:30 -07:00
tun_windows.go Make Interface.Inside an interface type (#252) 2020-07-28 08:53:16 -04:00
udp_android.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_darwin.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_freebsd.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_generic.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_linux.go Align linux UDP performance optimizations with configuration (#275) 2020-08-13 08:24:05 +10:00
udp_linux_32.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_linux_64.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -05:00
udp_windows.go Be more like a library to support mobile (#247) 2020-06-30 13:48:58 -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, and Windows. (Also: keep this quiet, but we have an early prototype running on iOS). 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.

You can read more about Nebula here.

You can also join the NebulaOSS Slack group here

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 key exchange, and AES-256-GCM in its default configuration.

Nebula was created to provide a mechanism for groups 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 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.