github.com/slackhq/nebula

Added

• Ability to output qr code images in print, ca, and sign modes for nebula-cert. This is useful when configuring mobile clients. (#297)

• Experimental: Nebula can now do work on more than 2 cpu cores in send and receive paths via the new routines config option. (#382, #391, #395)

• ICMP ping requests can be responded to when the tun.disabled is true. This is useful so that you can "ping" a lighthouse running in this mode. (#342)

• Run smoke tests via make smoke-docker. (#287)

• More reported stats, udp memory use on linux, build version (when using Prometheus), firewall, handshake, and cached packet stats. (#390, #405, #450, #453)

• IPv6 support for the underlay network. (#369)

• End to end testing, run with make e2e. (#425, #427, #428)

Changed

• Darwin will now log stdout/stderr to a file when using -service mode. (#303)

• Example systemd unit file now better arranged startup order when using sshd and other fixes. (#317, #412, #438)

• Reduced memory utilization/garbage collection. (#320, #323, #340)

• Reduced CPU utilization. (#329)

• Build against go 1.16. (#381)

• Refactored handshakes to improve performance and correctness. (#401, #402, #404, #416, #451)

• Improved roaming support for mobile clients. (#394, #457)

• Lighthouse performance and correctness improvements. (#406, #418, #429, #433, #437, #442, #449)

• Better ordered startup to enable sshd, stats, and dns subsystems to listen on the nebula interface. (#375)

Fixed

• No longer report handshake packets as lost in stats. (#331)

• Error handling in the cert package. (#339, #373)

• Orphaned pending hostmap entries are cleaned up. (#344)

• Most known data races are now resolved. (#396, #400, #424)

• Refuse to run a lighthouse on an ephemeral port. (#399)

• Removed the global references. (#423, #426, #446)

• Reloading via ssh command avoids a panic. (#447)

• Shutdown is now performed in a cleaner way. (#448)

• Logs will now find their way to Windows event viewer when running under -service mode in Windows. (#443)

Added

• You can emit statistics about non-message packets by setting the option stats.message_metrics. You can similarly emit detailed statistics about lighthouse packets by setting the option stats.lighthouse_metrics. See the example config for more details. (#230)

• We now support freebsd/amd64. This is experimental, please give us feedback. (#103)

• We now release a binary for linux/mips-softfloat which has also been stripped to reduce filesize and hopefully have a better chance on running on small mips devices. (#231)

• You can set tun.disabled to true to run a standalone lighthouse without a tun device (and thus, without root). (#269)

• You can set logging.disable_timestamp to remove timestamps from log lines, which is useful when output is redirected to a logging system that already adds timestamps. (#288)

Changed

• Handshakes should now trigger faster, as we try to be proactive with sending them instead of waiting for the next timer tick in most cases. (#246, #265)

• Previously, we would drop the conntrack table whenever firewall rules were changed during a SIGHUP. Now, we will maintain the table and just validate that an entry still matches with the new rule set. (#233)

• Debug logs for firewall drops now include the reason. (#220, #239)

• Logs for handshakes now include the fingerprint of the remote host. (#262)

• Config item pki.blacklist is now pki.blocklist. (#272)

• Better support for older Linux kernels. We now only set SO_REUSEPORT if tun.routines is greater than 1 (default is 1). We also only use the recvmmsg syscall if listen.batch is greater than 1 (default is 64). (#275)

• It is possible to run Nebula as a library inside of another process now. Note that this is still experimental and the internal APIs around this might change in minor version releases. (#279)

Deprecated

• pki.blacklist is deprecated in favor of pki.blocklist with the same functionality. Existing configs will continue to load for this release to allow for migrations. (#272)

Fixed

• advmss is now set correctly for each route table entry when tun.routes is configured to have some routes with higher MTU. (#245)

• Packets that arrive on the tun device with an unroutable destination IP are now dropped correctly, instead of wasting time making queries to the lighthouses for IP 0.0.0.0 (#267)

Added

• Add logging.timestamp_format config option. The primary purpose of this change is to allow logging timestamps with millisecond precision. (#187)

• Support unsafe_routes on Windows. (#184)

• Add lighthouse.remote_allow_list to filter which subnets we will use to handshake with other hosts. See the example config for more details. (#217)

• Add lighthouse.local_allow_list to filter which local IP addresses and/or interfaces we advertise to the lighthouses. See the example config for more details. (#217)

• Wireshark dissector plugin. Add this file in dist/wireshark to your Wireshark plugins folder to see Nebula packet headers decoded. (#216)

• systemd unit for Arch, so it can be built entirely from this repo. (#216)

Changed

• Added a delay to punching via lighthouse signal to deal with race conditions in some linux conntrack implementations. (#210)

  See deprecated, this also adds a new punchy.delay option that defaults to 1s.

• Validate all lighthouse.hosts and static_host_map VPN IPs are in the subnet defined in our cert. Exit with a fatal error if they are not in our subnet, as this is an invalid configuration (we will not have the proper routes set up to communicate with these hosts). (#170)

• Use absolute paths to system binaries on macOS and Windows. (#191)

• Add configuration options for handshakes. This includes options to tweak try_interval, retries and wait_rotation. See example config for descriptions. (#179)

• Allow -config file to not end in .yaml or yml. Useful when using -test and automated tools like Ansible that create temporary files without suffixes. (#189)

• The config test mode, -test, is now more thorough and catches more parsing issues. (#177)

• Various documentation and example fixes. (#196)

• Improved log messages. (#181, #200)

• Dependencies updated. (#188)

Deprecated

• punchy, punch_back configuration options have been collapsed under the now top level punchy config directive. (#210)

  punchy.punch - This is the old punchy option. Should we perform NAT hole punching (default false)?

  punchy.respond - This is the old punch_back option. Should we respond to hole punching by hole punching back (default false)?

Fixed

• Reduce memory allocations when not using unsafe_routes. (#198)

• Ignore packets from self to self. (#192)

• MTU fixed for unsafe_routes. (#209)

Added

• For macOS and Windows, build a special version of the binary that can install and manage its own service configuration. You can use this with nebula -service. If you are building from source, use make service to build this feature.
• Support for mips, mips64, 386 and ppc64le processors on Linux.
• You can now configure the DNS listen host and port with lighthouse.dns.host and lighthouse.dns.port.
• Subnet and routing support. You can now add a unsafe_routes section to your config to allow hosts to act as gateways to other subnets. Read the example config for more details. This is supported on Linux and macOS.

Changed

• Certificates now have more verifications performed, including making sure the certificate lifespan does not exceed the lifespan of the root CA. This could cause issues if you have signed certificates with expirations beyond the expiration of your CA, and you will need to reissue your certificates.
• If lighthouse interval is set to 0, never update the lighthouse (mobile optimization).
• Various documentation and example fixes.
• Improved error messages.
• Dependencies updated.

Fixed

• If you have a firewall rule with group: ["one-group"], this will now be accepted, with a warning to use group: "one-group" instead.
• The listen.host configuration option was previously ignored (the bind host was always 0.0.0.0). This option will now be honored.
• The ca_sha and ca_name firewall rule options should now work correctly.