use unix socket for Envoy admin webpage #3934

stevesloka · 2021-07-29T21:02:44Z

Moves the Envoy admin interface to use a unix socket
Creates new listener from Contour to expose read only information
from Envoy admin page over port 9001
Updates shutdown-manager to use new unix socket to begin Envoy
draining procedure

Signed-off-by: Steve Sloka slokas@vmware.com

codecov · 2021-07-29T21:06:10Z

Codecov Report

Merging #3934 (d8e3318) into main (f9f263e) will increase coverage by 0.16%.
The diff coverage is 84.10%.

❗ Current head d8e3318 differs from pull request most recent head 2ab514d. Consider uploading reports for the commit 2ab514d to get more accurate results

@@            Coverage Diff             @@
##             main    #3934      +/-   ##
==========================================
+ Coverage   77.54%   77.71%   +0.16%     
==========================================
  Files         112      112              
  Lines        8879     8978      +99     
==========================================
+ Hits         6885     6977      +92     
- Misses       1844     1852       +8     
+ Partials      150      149       -1

Impacted Files	Coverage Δ
cmd/contour/bootstrap.go	`0.00% <0.00%> (ø)`
cmd/contour/contour.go	`0.00% <0.00%> (ø)`
cmd/contour/serve.go	`11.73% <0.00%> (ø)`
cmd/contour/shutdownmanager.go	`29.57% <0.00%> (-6.46%)`	⬇️
internal/envoy/bootstrap.go	`55.88% <100.00%> (+5.88%)`	⬆️
internal/envoy/v3/bootstrap.go	`91.90% <100.00%> (ø)`
internal/envoy/v3/listener.go	`98.40% <100.00%> (+0.03%)`	⬆️
internal/envoy/v3/stats.go	`100.00% <100.00%> (ø)`
internal/featuretests/v3/envoy.go	`100.00% <100.00%> (ø)`
internal/featuretests/v3/featuretests.go	`86.99% <100.00%> (+0.17%)`	⬆️
... and 5 more

stevesloka · 2021-07-30T19:16:48Z

I think this is ready for a first look. The next bit would be to update all the docs which requires more drawing to fix up the diagram, etc.

sunjayBhatia

left some comments, still gotta try it out locally but looks good generally

we'll probably need some documentation on how this is going to work and what new knobs/limitations we've added here

I think besides the removal of the admin endpoints that let you modify things from the listener at port 9001 everything is functionally pretty much the same, would be good to enumerate if there are any differences now for the release notes to check if there are any breaking changes or workflow changes we can further mitigate

nice addition to the e2e tests!

examples/contour/03-envoy.yaml

sunjayBhatia · 2021-08-02T17:31:19Z

internal/envoy/bootstrap.go

+	// Value of "localhost" is invalid.
+	if address == "localhost" ||
+		net.ParseIP(address) != nil ||
+		!strings.Contains(address, "/") {


edge case, but someone could conceivably want to use a relative file path with just the file name here (e.g. just foo.sock), which could be valid

maybe we should make the validation be an absolute file path to prevent this and make sure people are exact (e.g. check for / at the start of the string)? or relax the validation a bit to not require a slash?

could also make it check for https://pkg.go.dev/os#PathSeparator so its not another step to cross-platform convert if we want to in the future

Yeah you'd have to map the path of that to where Envoy is running to make that work. Maybe this should change to just the path and not the name? Just trying to keep this super simple for folks.

I'll take it out and not require the /.

sunjayBhatia · 2021-08-02T17:33:21Z

internal/envoy/bootstrap.go

+	if address == "localhost" ||
+		net.ParseIP(address) != nil ||
+		!strings.Contains(address, "/") {
+		return fmt.Errorf("invalid value %q, must be a unix socket name", address)


maybe worth separating the error out for the localhost and ip address cases to say explicitly they are not allowed

internal/envoy/bootstrap.go

sunjayBhatia · 2021-08-02T17:36:47Z

internal/envoy/v3/listener.go

@@ -524,6 +524,17 @@ func SocketAddress(address string, port int) *envoy_core_v3.Address {
 			},
 		}
 	}
+	// Check if the address is a socket.
+	if strings.Contains(address, "/") {


could use https://pkg.go.dev/os#PathSeparator here though this could get interesting if we had a socket address that the contour controller (not bootstrap) was programming somehow for a non-unix host

test/e2e/deployment.go

test/e2e/infra/admin_test.go

sunjayBhatia · 2021-08-02T17:45:32Z

internal/xdscache/v3/listener.go

 	stats := envoy_v3.StatsListener(address, port)
-	return &ListenerCache{
+	admin := envoy_v3.AdminListener("127.0.0.1", 9001)


the admin port is configurable currently and I think that flag has kinda been dropped in a sense?

should we deprecate the flag? wire it through to make the listen port here for the read-only admin page configurable?

We could reuse the port flag, but maybe that's confusing?

I could reuse it for now, introduce a new flag and deprecate the old.

Ahh I see, I'm mixing up the bits. This would be a new flag on Contour to specify. Yeah let's do that, introduce a new config file item I guess and deprecate the bootstrap port.

cmd/contour/shutdownmanager.go

tsaarni · 2021-08-06T17:59:35Z

Regarding troubleshooting experience (ref discussion) I myself depend on port-forward + curl config_dump as well. Could the troubleshooting use case be covered by new sub-command on contour instead of having option to enable additional admin listener? Something like contour envoy config-dump.

youngnick

This LGTM, but I think it's worth calling out that this change has implications for running Envoy on Windows. I think it's more important to have a secure Linux deployment for now, so it's fine, but something for @sunjayBhatiaand @xaleeks to have a chat about maybe?

sunjayBhatia · 2021-08-11T16:15:56Z

This LGTM, but I think it's worth calling out that this change has implications for running Envoy on Windows. I think it's more important to have a secure Linux deployment for now, so it's fine, but something for @sunjayBhatiaand @xaleeks to have a chat about maybe?

windows does now support UDS but we would have to see if it works in this context specifically with envoy: https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/

i can see permissions in an emptydir volume possibly being a hangup etc. and would need to test things out

stevesloka · 2021-08-11T19:13:41Z

Regarding troubleshooting experience (ref discussion) I myself depend on port-forward + curl config_dump as well. Could the troubleshooting use case be covered by new sub-command on contour instead of having option to enable additional admin listener? Something like contour envoy config-dump.

@tsaarni ended up adding a new listener which exposes the read-only endpoints from the admin webpage over 127.0.0.1:9001 so you can still port-forward and get to those stats, but not expose the dangerous bits.

tsaarni · 2021-08-12T05:48:51Z

@tsaarni ended up adding a new listener which exposes the read-only endpoints from the admin webpage over 127.0.0.1:9001 so you can still port-forward and get to those stats, but not expose the dangerous bits.

@stevesloka This is surely better but wouldn't it still leave Envoy vulnerable for information exposure when enableExternalNameService is set true?

stevesloka · 2021-08-12T13:50:27Z

@stevesloka This is surely better but wouldn't it still leave Envoy vulnerable for information exposure when enableExternalNameService is set true?

Yup it would indeed do that if you enabled external name services. You'd still need to find a domain that points to localhost, etc, etc.

I'm also adding a config item to Contour to remove the readonly endpoint. So for folks who want to enable externalname, they can disable the entire admin interface.

stevesloka · 2021-08-12T13:53:47Z

Maybe I can just have it so that if the port is set to 0, then it's disabled rather than adding another config item.

tsaarni · 2021-08-12T14:07:05Z

Maybe I can just have it so that if the port is set to 0, then it's disabled rather than adding another config item.

Since the parameter is new in contour config, in theory not setting admin-port at all could mean disable admin listener. But then of course it would be a change in the current behavior - it was on by default, even without explicitly setting parameters in bootstrap command line.

stevesloka · 2021-08-12T18:40:36Z

That's a good point @tsaarni about it defaulting to on. Maybe we should keep that for now and if you want to disable, you have to explicitly set that.

We could change that behavior in the future if we'd like. I'm going to write up a docs PR next to explain all of this.

skriss

I think this change makes sense, had a few comments inline. I guess we also need to confirm that we're comfortable making this change in a minor release, although it could be considered a breaking change, in the interest of security.

internal/envoy/bootstrap.go

skriss · 2021-08-16T21:30:45Z

cmd/contour/bootstrap.go

@@ -26,8 +26,8 @@ func registerBootstrap(app *kingpin.Application) (*kingpin.CmdClause, *envoy.Boo
 	bootstrap := app.Command("bootstrap", "Generate bootstrap configuration.")
 	bootstrap.Arg("path", "Configuration file ('-' for standard output).").Required().StringVar(&config.Path)
 	bootstrap.Flag("resources-dir", "Directory where configuration files will be written to.").StringVar(&config.ResourcesDir)
-	bootstrap.Flag("admin-address", "Envoy admin interface address.").StringVar(&config.AdminAddress)
-	bootstrap.Flag("admin-port", "Envoy admin interface port.").IntVar(&config.AdminPort)
+	bootstrap.Flag("admin-address", "Envoy admin interface address.").Default("/admin/admin.sock").StringVar(&config.AdminAddress)


Probably worth adding to the help text to clarify this must be a path to a unix domain socket

skriss · 2021-08-16T21:31:40Z

cmd/contour/serve.go

+		// The enableDebugListener boolean is defaulted to true which matches Contour's current behavior.
+		// Future iterations can allow for this to be customized by the user if they desire to disable the
+		// Envoy admin interface entirely.


Is this comment stale? (Not seeing enableDebugListener anywhere, I think that was replaced by looking at the value of the port).

Yup good catch. I initially had that flag in there but took it out to reduce the amount of configuration items.

skriss · 2021-08-16T21:58:47Z

internal/envoy/v3/stats.go

@@ -80,3 +146,20 @@ func StatsListener(address string, port int) *envoy_listener_v3.Listener {
 		SocketOptions: TCPKeepaliveSocketOptions(),
 	}
 }
+
+func serviceStatsRoute(prefix string) *envoy_route_v3.Route {


probably not too big a deal but service-stats is a little confusing in this context since many of the admin routes are not stats-related.

yup I agree. That's what it got called initially. Not sure if we want to split off this admin stuff into a new one? But that seems like a waste. Also not sure if folks have the service-stats in any dashboards, etc.

I think to be fair we need to do a proper deprecation of this field. I really doubt this would be a breaking change for most, but not 100% sure. Ok to make a followup PR?

//cc @sunjayBhatia

sounds good to me, should err on the side of being careful 👍🏽

pkg/config/parameters.go

- Moves the Envoy admin interface to use a unix socket - Creates new listener from Contour to expose read only information from Envoy admin page over port 9001 - Updates shutdown-manager to use new unix socket to begin Envoy draining procedure Signed-off-by: Steve Sloka <slokas@vmware.com>

Signed-off-by: Steve Sloka <slokas@vmware.com>

youngnick

Only some small questions left from me, this is looking really great.

internal/envoy/bootstrap.go

youngnick · 2021-08-17T04:35:41Z

internal/envoy/bootstrap.go

+	if address == "localhost" || net.ParseIP(address) != nil {
+		return fmt.Errorf("invalid value %q, cannot be `localhost` or an ip address", address)
+	}
+	return nil


Should we check that the unix socket exists, or at least that the path is a valid one?

I'm not sure of the timing of that type of check. This is the bootstrap code which executes in the initContainer. Then the pod would startup after that. Need to double check if the volumes are all ready in init phase or not, I don't remember off the top of my head.

So volumes should be there, but Envoy creates the actual socket, so we can't check for this in the bootstrap since Envoy's not yet started.

youngnick · 2021-08-17T04:37:18Z

internal/xdscache/v3/listener.go

-	return &ListenerCache{
+func NewListenerCache(config ListenerConfig, statsAddress string, statsPort, adminPort int) *ListenerCache {
+	stats := envoy_v3.StatsListener(statsAddress, statsPort)
+	admin := envoy_v3.AdminListener("127.0.0.1", adminPort)


Should we set this to the socket name to make sure there's no confusion, or is this only used if we're exposing the admin back on a network interface?

This is used to create a listener which exposes the read-only bits from the admin page.

sunjayBhatia

largely looks good! interested in the comment(s) around "service-stats" name etc. and not sure as well if it is ok to change that etc.

cmd/contour/shutdownmanager.go

Signed-off-by: Steve Sloka <slokas@vmware.com>

skriss

Just one last nit then I think this LGTM

internal/envoy/bootstrap.go

Signed-off-by: Steve Sloka <slokas@vmware.com>

stevesloka · 2021-08-23T15:12:17Z

This should still be changed from "AdminAddress is the TCP address..." to "AdminAddress is the Unix domain socket path..."

bah, didn't push, sorry. fixed up!

skriss

no further comments, LGTM!

Move to Envoy Admin over unix socket to mitigate security issues with external name services. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com>

Move to Envoy Admin over unix socket to mitigate security issues with external name services. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com> Co-authored-by: Steve Sloka <slokas@vmware.com>

Updates the redeploy envoy docs as well as the Contour configuration docs for the Envoy Admin interface running as a unix socket. Updates projectcontour#3934 Signed-off-by: Steve Sloka <slokas@vmware.com>

Updates the redeploy envoy docs as well as the Contour configuration docs for the Envoy Admin interface running as a unix socket. Updates #3934 Signed-off-by: Steve Sloka <slokas@vmware.com>

…erver. Squashed commit of the following: commit da2f09a Author: Zhenhuan <zhenhli@microsoft.com> Date: Thu Nov 4 12:58:50 2021 +0800 update cert provider client commit 9c7085f Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Nov 3 16:44:44 2021 +0800 update commit 61aaea5 Author: Zhenhuan <zhenhli@microsoft.com> Date: Tue Nov 2 12:40:26 2021 +0800 Use mariner as base image commit 4db3590 Author: Zhenhuan <zhenhli@microsoft.com> Date: Tue Nov 2 12:01:24 2021 +0800 Skip vertify bootstrap options when loading cert from sds server commit 83aba4c Author: Zhenhuan <zhenhli@microsoft.com> Date: Tue Nov 2 11:32:54 2021 +0800 Rename flags commit eb81432 Author: Zhenhuan <zhenhli@microsoft.com> Date: Mon Nov 1 17:30:50 2021 +0800 Add cert options to cli to get certs from cert server commit c5cea20 Author: Zhenhuan <zhenhli@microsoft.com> Date: Fri Oct 29 18:21:45 2021 +0800 avoid calling certificate loader repeatly commit e95e61c Author: Zhenhuan <zhenhli@microsoft.com> Date: Fri Oct 29 16:52:09 2021 +0800 Add more logs commit db5263d Author: Zhenhuan <zhenhli@microsoft.com> Date: Fri Oct 29 15:37:52 2021 +0800 Fix tls connection error with envoy commit 18152d2 Author: Chloe Wang <qiwang@microsoft.com> Date: Fri Oct 29 10:11:52 2021 +0800 move log.printf into retry loop commit 3996b4d Author: Chloe Wang <qiwang@microsoft.com> Date: Thu Oct 28 22:12:26 2021 +0800 retry mechanism to connect contour certificate loader commit 3deac77 Author: Chloe Wang <qiwang@microsoft.com> Date: Mon Oct 25 11:55:57 2021 +0800 fix bug commit 7ad7be8 Author: Chloe Wang <qiwang@microsoft.com> Date: Mon Oct 25 11:21:39 2021 +0800 add retry mechanism to load cert from certificate loader commit 2caf5eb Author: Zhenhuan <zhenhli@microsoft.com> Date: Thu Oct 21 12:35:38 2021 +0800 Fix bugs commit 25b59c3 Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 19:06:38 2021 +0800 Fix crash commit 1703f8f Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 18:52:11 2021 +0800 update commit 1444e94 Merge: 73b7dbf 7168c61 Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 18:26:29 2021 +0800 Merge branch 'users/chloewang/loadcertfromserver' into users/zhenhli/certificate-issuer commit 7168c61 Merge: 4441c5d cabf4bc Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 18:25:15 2021 +0800 Merge branch 'users/chloewang/loadcertfromserver' of ssh.dev.azure.com:v3/skype/ES/dev_azure_contour into users/chloewang/loadcertfromserver commit 4441c5d Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 18:24:10 2021 +0800 Load envoy cert from sds server commit 73b7dbf Author: Zhenhuan <zhenhli@microsoft.com> Date: Wed Oct 20 14:35:30 2021 +0800 Fix typo commit cabf4bc Author: Chloe Wang <qiwang@microsoft.com> Date: Wed Oct 20 14:30:40 2021 +0800 fix flag name commit 20f6bdd Author: Chloe Wang <qiwang@microsoft.com> Date: Tue Oct 19 15:44:03 2021 +0800 add command load-cert-from-file to allow to load cerlocally or remotely commit ee37eea Author: Zhenhuan <zhenhli@microsoft.com> Date: Mon Oct 18 13:22:15 2021 +0800 Update document commit 638a47a Author: Zhenhuan <zhenhli@microsoft.com> Date: Thu Oct 14 11:00:37 2021 +0800 Update commit 54eb3f3 Author: Zhenhuan <zhenhli@microsoft.com> Date: Tue Oct 12 17:18:49 2021 +0800 Update commit 99756f9 Author: Zhenhuan <zhenhli@microsoft.com> Date: Tue Oct 12 17:06:38 2021 +0800 Fix crashes commit 00f5c65 Author: Zhenhuan <zhenhli@microsoft.com> Date: Mon Oct 11 17:13:49 2021 +0800 Fix crash commit 5ee68ad Author: Zhenhuan <zhenhli@microsoft.com> Date: Mon Oct 11 16:54:30 2021 +0800 update commit caf0115 Author: Zhenhuan <zhenhli@microsoft.com> Date: Mon Oct 11 16:37:37 2021 +0800 Support external sds server commit 6a583fc Author: zhengyangdu@microsoft.com <zhengyangdu@microsoft.com> Date: Mon Oct 11 11:06:43 2021 +0800 support SDS server commit f362f4d Author: Sunjay Bhatia <sunjayb@vmware.com> Date: Thu Aug 26 14:44:01 2021 +0000 Update Contour Docker image to v1.18.1. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com> commit 8a36305 Author: Sunjay Bhatia <5337253+sunjayBhatia@users.noreply.github.com> Date: Wed Aug 25 15:16:23 2021 -0400 Cherrypick projectcontour#3934 (projectcontour#3982) Move to Envoy Admin over unix socket to mitigate security issues with external name services. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com> Co-authored-by: Steve Sloka <slokas@vmware.com> commit 755c317 Author: Steve Kriss <krisss@vmware.com> Date: Wed Aug 25 07:03:05 2021 -0600 update Envoy to v1.19.1 (projectcontour#3966) Signed-off-by: Steve Kriss <krisss@vmware.com> commit 889ec61 Author: Sunjay Bhatia <sunjayb@vmware.com> Date: Wed Jul 28 11:51:29 2021 -0400 Update Contour Docker image to v1.18.0. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com>

stevesloka force-pushed the adminSocket branch 3 times, most recently from 14f34dc to 0466dd9 Compare July 30, 2021 19:14

stevesloka marked this pull request as ready for review July 30, 2021 19:16

stevesloka requested a review from a team as a code owner July 30, 2021 19:16

stevesloka requested review from skriss, youngnick and sunjayBhatia and removed request for a team July 30, 2021 19:16

sunjayBhatia reviewed Aug 2, 2021

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sunjayBhatia added the release-note Denotes a PR that will be considered when it comes time to generate release notes. label Aug 2, 2021

sunjayBhatia added this to the 1.19.0 milestone Aug 2, 2021

dprotaso mentioned this pull request Aug 9, 2021

Backport Contour CVE-2021-32783 mitigations #3942

Closed

This was referenced Aug 10, 2021

Contour Deployment/Envoy DaemonSet should be updated for secure Admin listener projectcontour/contour-operator#423

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Update Helm Chart to new secure Admin listener setup #3943

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stevesloka force-pushed the adminSocket branch from 62526cb to 93bd281 Compare August 10, 2021 20:29

stevesloka mentioned this pull request Aug 10, 2021

cmd/contour: Add admin-address flag to shutdown-manager #3929

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youngnick approved these changes Aug 11, 2021

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dprotaso mentioned this pull request Aug 12, 2021

Alternatives approaches to supporting ExternalName services #3950

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skriss requested changes Aug 16, 2021

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stevesloka added 10 commits August 16, 2021 22:38

review comments

8b3a551

Signed-off-by: Steve Sloka <slokas@vmware.com>

fixes

0e29b14

Signed-off-by: Steve Sloka <slokas@vmware.com>

fixup envoy yaml

a64e0bd

Signed-off-by: Steve Sloka <slokas@vmware.com>

restore makefile from local testing

798cd94

Signed-off-by: Steve Sloka <slokas@vmware.com>

make admin port optional if set to zero

28e4ef5

Signed-off-by: Steve Sloka <slokas@vmware.com>

refactor unix socket helper to be its own method

fc33160

Signed-off-by: Steve Sloka <slokas@vmware.com>

fixup generated files

7459e7f

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fixup method refactor

1de9689

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review comments from skriss

16aa991

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stevesloka force-pushed the adminSocket branch from 176e503 to 16aa991 Compare August 17, 2021 02:45

youngnick reviewed Aug 17, 2021

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sunjayBhatia reviewed Aug 18, 2021

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cmd/contour/shutdownmanager.go Outdated Show resolved Hide resolved

mark admin-port as deprecated

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Signed-off-by: Steve Sloka <slokas@vmware.com>

skriss requested changes Aug 23, 2021

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internal/envoy/bootstrap.go Show resolved Hide resolved

last nit

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stevesloka mentioned this pull request Aug 23, 2021

Deprecate service-stats cluster for Envoy Admin #3959

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stevesloka merged commit 0f03a10 into projectcontour:main Aug 24, 2021

stevesloka deleted the adminSocket branch August 24, 2021 14:50

sunjayBhatia pushed a commit to sunjayBhatia/contour that referenced this pull request Aug 25, 2021

Cherrypick projectcontour#3934

6e93b4a

Move to Envoy Admin over unix socket to mitigate security issues with external name services. Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com>

stevesloka mentioned this pull request Aug 25, 2021

site: Update docs for Envoy Admin using unix socket #3985

Merged

use unix socket for Envoy admin webpage #3934

use unix socket for Envoy admin webpage #3934

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