Synchronous CLI command for root CA rotation #48

cyli · 2017-05-08T21:51:22Z

Provide command line tool to view and rotate swarm's currently CA root certificate.

Signed-off-by: Ying Li ying.li@docker.com

This code was originally in moby/moby#32993.

root@ubuntu:~#  docker swarm ca
-----BEGIN CERTIFICATE-----
MIIBazCCARCgAwIBAgIUJPzo67QC7g8Ebg2ansjkZ8CbmaswCgYIKoZIzj0EAwIw
EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTcwNTAzMTcxMDAwWhcNMzcwNDI4MTcx
MDAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH
A0IABKL6/C0sihYEb935wVPRA8MqzPLn3jzou0OJRXHsCLcVExigrMdgmLCC+Va4
+sJ+SLVO1eQbvLHH8uuDdF/QOU6jQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB
Af8EBTADAQH/MB0GA1UdDgQWBBSfUy5bjUnBAx/B0GkOBKp91XvxzjAKBggqhkjO
PQQDAgNJADBGAiEAnbvh0puOS5R/qvy1PMHY1iksYKh2acsGLtL/jAIvO4ACIQCi
lIwQqLkJ48SQqCjG1DBTSBsHmMSRT+6mE2My+Z3GKA==
-----END CERTIFICATE-----

root@ubuntu:~# docker swarm ca --help

Usage:	docker swarm ca [OPTIONS]

Manage root CA

Options:
      --ca-cert pem-file          Path to the PEM-formatted root CA certificate to use for the new cluster
      --ca-key pem-file           Path to the PEM-formatted root CA key to use for the new cluster
      --cert-expiry duration      Validity period for node certificates (ns|us|ms|s|m|h) (default 2160h0m0s)
  -d, --detach                    Exit immediately instead of waiting for the root rotation to converge
      --external-ca external-ca   Specifications of one or more certificate signing endpoints
      --help                      Print usage
  -q, --quiet                     Suppress progress output
      --rotate                    Rotate the swarm CA - if no certificate or key are provided, new ones will be generated

Sample progress bar here, copied styling from the synchronous service create progress bar: https://asciinema.org/a/2em3i7y1u50ajeut13es5m6uh

Note: I originally thought about just doing docker swarm update --rotate-ca cert=/path/...,key=/path/... but I wasn't sure how to also do tell the CLI to just generate a cert and key - it'd probably have to look like docker swarm update --rotate-ca "" which seems weird, hence the new command.

Also a suggestion from @NathanMcCauley: if we have service identities, and those could be rotated, do we want to use the same CLI command to view/rotate those as well?

cyli · 2017-05-12T17:55:32Z

Have re-vendored the latest version of moby/moby master instead of my fork, so this is ready for review.

thaJeztah · 2017-05-15T09:43:50Z

Looking at this again, I wonder if;

swarm ca should be a separate command; it's showing a single field in the swarm configuration, does this open the door to creating a separate command for each property? Is this information part of docker system info (or should we have docker swarm info? Possibly --rotate should be part of docker swarm update
if we do think ca should be its own "entity" / "object type" in the CLI, should it follow the ls / list / inspect etc subcommands? (will be a bit odd as well, given that there's only a single CA, not a list)
If we want to keep it similar to join-token, then swarm ca --rotate should print the ca after it was rotated

Happy to hear thoughts @aaronlehmann @diogomonica @dnephin

cyli · 2017-05-15T17:33:19Z

Possibly --rotate should be part of docker swarm update

I originally thought about just doing docker swarm update --rotate-ca cert=/path/...,key=/path/... but I wasn't sure how to also do tell the CLI to just generate a cert and key - it'd probably have to look like docker swarm update --rotate-ca "" which seems weird, hence the new command - but happy to have other opinions and suggestions instead - maybe the cert and key can be different flags?

The one argument I'd have for a separate command is that docker swarm update already has a bunch of flags, and the extra ones here (--ca-cert, --ca-key, -d and -q) for instance all seem to be bundled together, so maybe including them in a separate command makes sense?

Is this information part of docker system info (or should we have docker swarm info)?

Some of this info is currently on docker system info - I don't mind adding a docker swarm info, if that'd be useful - it seems like system info includes swarm info though.

If we want to keep it similar to join-token, then swarm ca --rotate should print the ca after it was rotated.

Happy to do that as well.

diogomonica · 2017-05-15T19:40:44Z

I have a slight preference for having the ca subcommand

diogomonica · 2017-05-15T19:41:05Z

LGTM

cyli · 2017-05-16T00:17:51Z

Updated the --rotate command to print out the final CA certificate after the root rotation is complete.

aaronlehmann · 2017-05-16T00:21:31Z

LGTM

tonistiigi · 2017-05-16T18:54:48Z

cli/command/swarm/ca.go

+		go func() {
+			for {
+				var buf [1024]byte
+				if _, err := pipeReader.Read(buf[:]); err != nil {


nit: this could be simpler with ioutil.Discard

Updated with io.Copy(ioutil.Discard, pipeReader)

Don't need a for or function wrapper anymore.

thaJeztah

left one comment, LGTM otherwise

thaJeztah · 2017-05-16T21:13:02Z

cli/command/swarm/ca.go

+		Args:  cli.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runRotateCA(dockerCli, cmd.Flags(), opts)
+		},


Can you add

Tags: map[string]string{"version": "1.30"},

like we have on cli/command/system/prune.go#L31, so that the command is hidden when talking to an older daemon, and produces an error that it requires a newer daemon

…t certificate. Signed-off-by: Ying Li <ying.li@docker.com>

Signed-off-by: Ying Li <ying.li@docker.com>

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

aaronlehmann · 2017-05-16T21:36:24Z

@tonistiigi: Pushed a commit that simplifies the use of io.Copy

tonistiigi · 2017-05-16T21:37:21Z

LGTM

cyli · 2017-05-16T22:01:08Z

Thanks @aaronlehmann!

bkatiemills · 2017-06-19T13:59:27Z

Hi folks - Training wants to highlight this feature in our workshops, but I'm a bit confused; docker swarm ca --cert-expiry 720h spits a key back at me on 17.06.0-ce-rc2 but shows no change to the CA configuration / expiry duration key in the output of docker system info. I assumed (wrongly?) this command was equivalent to docker swarm update --cert-expiry 720h, which does show an updated expiry duration immediately. Thoughts?

cyli · 2017-06-19T17:52:02Z

@BillMills Ah, apologies, that was intended to be used with the --rotate flag (e.g. you can rotate the CA cert and update the cert expiry to be used with that new cert at the same time. If you don't pass --rotate, it ignores all the other flags, since cert expiry could also be changed with docker swarm update --cert-expiry ....

Wondering if we should update the flags, if used by themselves, to specify that they are ignored unless --rotate is passed?

dnephin · 2017-06-19T18:31:40Z

A warning would be great. We might even want to consider it an error.

cyli mentioned this pull request May 8, 2017

API changes to rotate swarm root CA moby/moby#32993

Merged

cyli changed the title ~~WIP: CLI command for root CA rotation~~ WIP: Synchronous CLI command for root CA rotation May 9, 2017

cyli mentioned this pull request May 10, 2017

Root CA rotation CLI docs moby/moby#33152

Merged

cyli changed the title ~~WIP: Synchronous CLI command for root CA rotation~~ Synchronous CLI command for root CA rotation May 12, 2017

tonistiigi reviewed May 16, 2017

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cyli mentioned this pull request May 16, 2017

External CA is not being accepted by new swarm node moby/moby#33216

Closed

thaJeztah requested changes May 16, 2017

View reviewed changes

cyli and others added 3 commits May 16, 2017 14:31

Provide command line tool to view and rotate swarm's currently CA roo…

3fe8321

…t certificate. Signed-off-by: Ying Li <ying.li@docker.com>

Re-vendor docker/docker.

103bfb2

Signed-off-by: Ying Li <ying.li@docker.com>

Avoid loop when discarding contents of progress pipe

51f6983

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

aaronlehmann merged commit c17acee into docker:master May 16, 2017

GordonTheTurtle added this to the 17.06.0 milestone May 16, 2017

cyli deleted the root-rotation-cli branch May 16, 2017 22:00

cyli mentioned this pull request Jun 19, 2017

If docker swarm ca is not called with the --rotate flag, warn if other flags are passed #207

Merged

thaJeztah added impact/changelog impact/documentation labels Jun 27, 2017

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Synchronous CLI command for root CA rotation #48

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Synchronous CLI command for root CA rotation #48

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