This commit modifies the k8s-operator's api proxy implementation to only
enable forwarding of api requests to tsrecorder when an environment
variable is set.
This new environment variable is named `TS_EXPERIMENTAL_KUBE_API_EVENTS`.
Updates https://github.com/tailscale/corp/issues/32448
Signed-off-by: David Bond <davidsbond93@gmail.com>
The serve code leaves it up to the system's DNS resolver and netstack to
figure out how to reach the proxy destination. Combined with k8s-proxy
running in userspace mode, this means we can't rely on MagicDNS being
available or tailnet IPs being routable. I'd like to implement that as a
feature for serve in userspace mode, but for now the safer fix to get
kube-apiserver ProxyGroups consistently working in all environments is to
switch to using localhost as the proxy target instead.
This has a small knock-on in the code that does WhoIs lookups, which now
needs to check the X-Forwarded-For header that serve populates to get
the correct tailnet IP to look up, because the request's remote address
will be loopback.
Fixes#16920
Change-Id: I869ddcaf93102da50e66071bb00114cc1acc1288
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
When kubectl starts an interactive attach session, it sends 2 resize
messages in quick succession. It seems that particularly in HTTP mode,
we often receive both of these WebSocket frames from the underlying
connection in a single read. However, our parser currently assumes 0-1
frames per read, and leaves the second frame in the read buffer until
the next read from the underlying connection. It doesn't take long after
that before we end up failing to skip a control message as we normally
should, and then we parse a control message as though it will have a
stream ID (part of the Kubernetes protocol) and error out.
Instead, we should keep parsing frames from the read buffer for as long
as we're able to parse complete frames, so this commit refactors the
messages parsing logic into a loop based on the contents of the read
buffer being non-empty.
k/k staging/src/k8s.io/kubectl/pkg/cmd/attach/attach.go for full
details of the resize messages.
There are at least a couple more multiple-frame read edge cases we
should handle, but this commit is very conservatively fixing a single
observed issue to make it a low-risk candidate for cherry picking.
Updates #13358
Change-Id: Iafb91ad1cbeed9c5231a1525d4563164fc1f002f
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
Updates k8s-proxy's config so its auth mode config matches that we set
in kube-apiserver ProxyGroups for consistency.
Updates #13358
Change-Id: I95e29cec6ded2dc7c6d2d03f968a25c822bc0e01
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
Adds a new reconciler for ProxyGroups of type kube-apiserver that will
provision a Tailscale Service for each replica to advertise. Adds two
new condition types to the ProxyGroup, TailscaleServiceValid and
TailscaleServiceConfigured, to post updates on the state of that
reconciler in a way that's consistent with the service-pg reconciler.
The created Tailscale Service name is configurable via a new ProxyGroup
field spec.kubeAPISserver.ServiceName, which expects a string of the
form "svc:<dns-label>".
Lots of supporting changes were needed to implement this in a way that's
consistent with other operator workflows, including:
* Pulled containerboot's ensureServicesUnadvertised and certManager into
kube/ libraries to be shared with k8s-proxy. Use those in k8s-proxy to
aid Service cert sharing between replicas and graceful Service shutdown.
* For certManager, add an initial wait to the cert loop to wait until
the domain appears in the devices's netmap to avoid a guaranteed error
on the first issue attempt when it's quick to start.
* Made several methods in ingress-for-pg.go and svc-for-pg.go into
functions to share with the new reconciler
* Added a Resource struct to the owner refs stored in Tailscale Service
annotations to be able to distinguish between Ingress- and ProxyGroup-
based Services that need cleaning up in the Tailscale API.
* Added a ListVIPServices method to the internal tailscale client to aid
cleaning up orphaned Services
* Support for reading config from a kube Secret, and partial support for
config reloading, to prevent us having to force Pod restarts when
config changes.
* Fixed up the zap logger so it's possible to set debug log level.
Updates #13358
Change-Id: Ia9607441157dd91fb9b6ecbc318eecbef446e116
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
Adds a new k8s-proxy command to convert operator's in-process proxy to
a separately deployable type of ProxyGroup: kube-apiserver. k8s-proxy
reads in a new config file written by the operator, modelled on tailscaled's
conffile but with some modifications to ensure multiple versions of the
config can co-exist within a file. This should make it much easier to
support reading that config file from a Kube Secret with a stable file name.
To avoid needing to give the operator ClusterRole{,Binding} permissions,
the helm chart now optionally deploys a new static ServiceAccount for
the API Server proxy to use if in auth mode.
Proxies deployed by kube-apiserver ProxyGroups currently work the same as
the operator's in-process proxy. They do not yet leverage Tailscale Services
for presenting a single HA DNS name.
Updates #13358
Change-Id: Ib6ead69b2173c5e1929f3c13fb48a9a5362195d8
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
The defaultEnv and defaultBool functions are copied over temporarily
to minimise diff. This lays the ground work for having both the operator
and the new k8s-proxy binary implement the API proxy
Updates #13358
Change-Id: Ieacc79af64df2f13b27a18135517bb31c80a5a02
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
David Bond
Tom Meadows
Tom Proctor