* plumb context to keystore methods
Contexts are more relevant now with the GCP KMS keystore which makes
http requests, this commit makes sure they are passed everywhere they
are needed, with only a few `context.TODO`s sprinkled in.
* Fix goroutine and memory leak in watchCertAuthorities
The CA Watcher was blocking both on writing to a channel when the watcher
was closed and on HTTP calls that had no request timeout or context passed
to cause cancellation.
All resourceWatcher implementations that had a bug which may cause them to block
on writing to a channel forever were fixed by selecting on the write and ctx.Done.
Adding context.Context to all Get/Put/Post/Delete methods on the auth HTTPClient to
force callers to propagate context. Prior all calls used context.TODO which
prevents requests from being properly cancelled.
Add context propagation to RotateCertAuthority, RotateExternalCertAuthority,
GetCertAuthority, GetCertAuthorities. This is needed to get the correct ctx
from the CertAtuhorityWatcher all the way down to the HTTPClient that makes
the call.
Closes#10648
* PIV authentication for RDP
This uncomfortably large change fully implements smartcard PIV
authentication for RDP clients using the Teleport CA:
- PIV applet implementation in emulated RDP smartcard
- generating Windows-compatible certificates using Teleport CA with a
dedicated RPC
- generating dummy CRLs for Teleport CA and publishing it via LDAP
The CRLs are required by Windows for any smartcard login certificate, we
can't avoid that. But we can avoid making it public: the CRL can live in
ActiveDirectory instead of a public endpoint of a Teleport service.
Here, we use LDAP to publish the CRL on startup, valid for a year.
There are a few unhandled cases in the current implementation:
- LDAP server certificate is not validated when upgrading to TLS
- multiple active CAs (with HSMs) are not supported, only one CRL is
published
- CA rotation is not supported, CRL is not re-published on rotation
All of the above issues will be handled in future PRs as this one is
already too large.
* Address review feedback
* Fix linter errors
Przemko Robakowski