[WIP] 3026: Add support for s3 data importer inheriting service account credentials #3433

russellcain · 2024-09-12T19:50:23Z

What type of PR is this?

/kind feature

What this PR does / why we need it:

Allows for consistent use of credentials configured in the service account, for S3 data volume sources.

Which issue(s) this PR fixes:

Fixes CDI importer requires static credentials for S3 and GCS (renewed) #3429

Special notes for your reviewer:

Hi -- I'll add in some tests shortly, just wanted to get eyes on the core of the change to make sure I'm not barking up the wrong trunk. If we could start the conversation in the interim, I'd appreciate that.

Does this PR introduce a user-facing change?:

It does allow a new value in the DataVolumeSourceS3 configuration. The needed code-gen files are included in this pull request.

Release note:

Related to https://github.com/kubevirt/containerized-data-importer/issues/3429

This change stems from the desire for a spun-up S3 reader to utilize the aws credentials configured at the Service Account level. The belief is that this would promote consistency in access / minimize any duplication of aws credential keys in the configuration of this S3 CDI. For this PR, we just provide the user with the ability to specify the `ServiceAccountName` instead of an `AccessKey`/`SecretKey` combo. No core/default functionality will change for users which wish to stick with that key combo approach.  

At the importer level, this update utilizes AWS' IRSA credential chain approach. This is a stable approach that has go sdk approach. Additionally, this PR added the recommended `CredentialsChainVerboseErrors` to the aws session configuration. If reviewers worry that this will be too noisy, I am fine with it being removed.

Signed-off-by: _____

kubevirt-bot · 2024-09-12T19:50:31Z

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kubevirt-bot · 2024-09-12T19:50:36Z

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russellcain · 2024-09-12T19:52:04Z

/hold

…dentials Signed-off-by: russellcain <[email protected]>

Signed-off-by: russellcain <[email protected]>

russellcain · 2024-09-13T16:58:01Z

(recent force push to include signoff)
@aglitke and @ShellyKa13 thanks for taking the time to look this over! any and all pointers on how you'd like tests to be done are appreciated

mhenriks · 2024-09-16T16:28:36Z

/test

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mhenriks · 2024-09-16T16:28:47Z

/test all

Signed-off-by: russellcain <[email protected]>

russellcain · 2024-09-17T16:24:23Z

/test all

kubevirt-bot · 2024-09-17T16:24:40Z

@russellcain: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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russellcain · 2024-09-19T17:57:06Z

@mhenriks would you mind kicking off the tests for me, please?

mhenriks · 2024-09-19T18:07:57Z

/test all

awels · 2024-09-19T19:33:16Z

/test pull-cdi-goveralls

mhenriks · 2024-09-19T19:38:00Z

cmd/cdi-importer/importer.go

@@ -255,6 +255,7 @@ func newDataSource(source string, contentType string, volumeMode v1.PersistentVo
 	ep, _ := util.ParseEnvVar(common.ImporterEndpoint, false)
 	acc, _ := util.ParseEnvVar(common.ImporterAccessKeyID, false)
 	sec, _ := util.ParseEnvVar(common.ImporterSecretKey, false)
+	serviceAccount, _ := util.ParseEnvVar(common.ImporterServiceAccountName, false)


I don't see that this env var is getting set on the import pod. Here are some reference points:

https://github.com/russellcain/containerized-data-importer/blob/a87f77d4f010ee3fb2ca4b30111b7d70596c2eb2/pkg/controller/import-controller.go#L558
https://github.com/russellcain/containerized-data-importer/blob/a87f77d4f010ee3fb2ca4b30111b7d70596c2eb2/pkg/controller/import-controller.go#L1176

ah rats! thanks for closing this gap in my understanding -- let me take a stab at that right now

okay so fingers crossed that I understood how this flows in 04d29c3

I dont need to add anything here, right?
https://github.com/russellcain/containerized-data-importer/blob/41ba02d03ce0205b38fdfc9cbae4a1dc17b3abff/tools/cdi-source-update-poller/main.go#L48
looks like more so this parses env vars (which the SA doesnt fall into) and args passed at invocation (also not applicable)?

should i be adding a check about the source here? and then set it to any value if the PodSpec has a SA set?

mhenriks · 2024-09-19T19:49:41Z

cmd/cdi-importer/importer.go

+			ds  *importer.S3DataSource
+			err error
+		)
+		if serviceAccount != "" {


Is the value of serviceAccount ever used in the aws API? Or does the aws lib assume that the pod is running as the privileged service account?

The latter! hopefully i was too far off base, but the approach was that this would be used as a "flag" given the service account should have been properly set up by the time it is invoked here? (or fail on referencing an un-instantiated SA)

Signed-off-by: russellcain <[email protected]>

russellcain · 2024-09-24T14:51:55Z

/retest

kubevirt-bot · 2024-09-24T14:52:13Z

@russellcain: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/retest

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awels · 2024-09-24T15:09:39Z

/test all

coveralls · 2024-09-24T15:19:11Z

coverage: 59.217% (-0.04%) from 59.26%
when pulling 4b97bf6 on russellcain:3026/IRSA-integration-for-s3-service-accounts
into d08e245 on kubevirt:main.

mhenriks · 2024-09-25T01:07:33Z

pkg/controller/import-controller.go

@@ -1263,6 +1264,10 @@ func makeImportEnv(podEnvVar *importPodEnvVar, uid types.UID) []corev1.EnvVar {
 			Name:  common.CacheMode,
 			Value: podEnvVar.cacheMode,
 		},
+		{
+			Name:  common.ImporterServiceAccountName,
+			Value: podEnvVar.serviceAccountName,


Couple things

if the worker pod does not need to know the SA name and this param is just a flag for setting sessionConfig.CredentialsChainVerboseErrors = aws.Bool(true) then why not make this a boolean value with key something like S3_CREDENTIALS_CHAIN_AUTH

You have to set the service account name in the importer pod spec somewhere in here: https://github.com/russellcain/containerized-data-importer/blob/3026/IRSA-integration-for-s3-service-accounts/pkg/controller/import-controller.go#L884-L949

hi -- thanks for explaining this, i think i am almost on the same page so appreciate the patience on your end.

for 1, does this handle my concern posted here? I agree that, to the best of my knowledge, the SA name itself will not be meaningfully used by the worker pod and instead is just a flag to not set sessionConfig.Credentials. I guess i was hoping to make a smaller footprint / mimic other patterns where referencing/supplying a SA name in the pod spec communicates that the values of that account are consumed by the pod (since that is happening in this case, just not through an explicit invocation). If I'm talking myself into circles, please let me know, but does this make sense?

I also see the merit in an explicit boolean flag -- if what im explaining above comes across as anything hand-wavy, then I'd be alright with someone knowing what they are signing up for with the S3_CREDENTIALS_CHAIN_AUTH value being set. I guess I'd just be a bit worried that the hypothetical user would set this value without having set a SA? and the approach of specifying the SA name slightly safeguards against that? I might be over-worrying here.

for 2, happy to make this change, but wanted to confirm my understanding. are you saying we need the value set at the top level spec definition for how I'm attempting to consume it later on in cmd/cdi-importer/importer.go? that makes sense to me, but would still want to make sure i got eyes on https://github.com/kubevirt/containerized-data-importer/pull/3433/files#r1767598831

thanks again for taking your time to help me with this, @mhenriks!

S3_CREDENTIALS_CHAIN_AUTH would just be the name of the environment variable in the importer pod spec. This should not be visible to users in any way. Importer pods are created/managed by cdi-deployment controller. The user will still specify the service account name in the API as you have already declared

The pod spec.serviceAccountName should be set to the value the user set in the datavolume. See here: https://github.com/russellcain/containerized-data-importer/blob/3026/IRSA-integration-for-s3-service-accounts/pkg/controller/import-controller.go#L915-L925

Spec: corev1.PodSpec{ Containers: makeImporterContainerSpec(args), InitContainers: makeImporterInitContainersSpec(args), Volumes: makeImporterVolumeSpec(args), RestartPolicy: corev1.RestartPolicyOnFailure, NodeSelector: args.workloadNodePlacement.NodeSelector, Tolerations: args.workloadNodePlacement.Tolerations, Affinity: args.workloadNodePlacement.Affinity, PriorityClassName: args.priorityClassName, ImagePullSecrets: args.imagePullSecrets, -------------> ServiceAccountName: args.serviceAccountName },

some documentation here explaining what happens when the serviceAccountName is added to the pod, what the pod-identity-webhook is mutating in the pod spec

russellcain · 2024-09-25T12:59:07Z

will wait back on a response to this conversation before i push up my changes. thanks again, @mhenriks

Signed-off-by: russellcain <[email protected]>

russellcain · 2024-10-02T16:13:53Z

thanks for the added context, @chomatdam -- can you let me know if my changes in 69501ee seem to line up with the approach you described, please @mhenriks? thanks again for your guidance on this

russellcain · 2024-10-08T19:53:06Z

@mhenriks hi - would you mind kicking off the tests for this / taking a quick look over 69501ee when you have a chance, please? thank you!

mhenriks

getting there!

mhenriks · 2024-10-08T20:25:30Z

cmd/cdi-importer/importer.go

@@ -255,6 +255,7 @@ func newDataSource(source string, contentType string, volumeMode v1.PersistentVo
 	ep, _ := util.ParseEnvVar(common.ImporterEndpoint, false)
 	acc, _ := util.ParseEnvVar(common.ImporterAccessKeyID, false)
 	sec, _ := util.ParseEnvVar(common.ImporterSecretKey, false)
+	use_s3_credential_chain_auth, _ := strconv.ParseBool(os.Getenv(common.UseS3CredentialsChainAuth))


use_s3_credential_chain_auth is a little verbose compared to other variable names maybe just s3ChainAuth?

mhenriks · 2024-10-08T20:25:59Z

pkg/controller/import-controller.go

+	extraHeaders                 []string
+	secretExtraHeaders           []string
+	cacheMode                    string
+	use_s3_credential_chain_auth bool


how about s3ChainAuth as variable name?

mhenriks · 2024-10-08T20:26:55Z

pkg/controller/import-controller.go

@@ -117,6 +118,7 @@ type importerPodArgs struct {
 	workloadNodePlacement   *sdkapi.NodePlacement
 	vddkImageName           *string
 	priorityClassName       string
+	serviceAccountName      string


Where is this getting assigned?

mhenriks · 2024-10-08T20:27:40Z

/test all

kubevirt-bot · 2024-10-08T20:55:14Z

@russellcain: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdi-unit-test-s390x	`69501ee`	link	false	`/test pull-cdi-unit-test-s390x`
pull-cdi-goveralls	`69501ee`	link	false	`/test pull-cdi-goveralls`
pull-cdi-unit-test	`69501ee`	link	false	`/test pull-cdi-unit-test`
pull-cdi-linter	`69501ee`	link	false	`/test pull-cdi-linter`

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kubevirt-bot added release-note Denotes a PR that will be considered when it comes time to generate release notes. dco-signoff: no Indicates the PR's author has not DCO signed all their commits. labels Sep 12, 2024

kubevirt-bot requested review from aglitke and ShellyKa13 September 12, 2024 19:50

kubevirt-bot added the size/L label Sep 12, 2024

kubevirt-bot added the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Sep 12, 2024

russellcain changed the title ~~3026: Add support for s3 data importer inheriting service account credentials~~ [WIP] 3026: Add support for s3 data importer inheriting service account credentials Sep 12, 2024

kubevirt-bot added the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Sep 12, 2024

russellcain added 2 commits September 13, 2024 11:53

3026: Add support for s3 data importer inheriting service account cre…

9c6eaba

…dentials Signed-off-by: russellcain <[email protected]>

3026: proper wrapper approach for NewChainCredentialsS3DataSource

81b3c8e

Signed-off-by: russellcain <[email protected]>

russellcain force-pushed the 3026/IRSA-integration-for-s3-service-accounts branch from e1f84ca to 81b3c8e Compare September 13, 2024 16:53

kubevirt-bot added dco-signoff: yes Indicates the PR's author has DCO signed all their commits. and removed dco-signoff: no Indicates the PR's author has not DCO signed all their commits. labels Sep 13, 2024

kubevirt-bot added dco-signoff: no Indicates the PR's author has not DCO signed all their commits. and removed dco-signoff: yes Indicates the PR's author has DCO signed all their commits. labels Sep 16, 2024

3026: lint fixes

a87f77d

Signed-off-by: russellcain <[email protected]>

russellcain force-pushed the 3026/IRSA-integration-for-s3-service-accounts branch from a82147e to a87f77d Compare September 17, 2024 16:16

kubevirt-bot added dco-signoff: yes Indicates the PR's author has DCO signed all their commits. and removed dco-signoff: no Indicates the PR's author has not DCO signed all their commits. labels Sep 17, 2024

mhenriks reviewed Sep 19, 2024

View reviewed changes

kubevirt-bot added dco-signoff: no Indicates the PR's author has not DCO signed all their commits. and removed dco-signoff: yes Indicates the PR's author has DCO signed all their commits. labels Sep 19, 2024

3206: import serviceAccountName as an envVar

4b97bf6

Signed-off-by: russellcain <[email protected]>

russellcain force-pushed the 3026/IRSA-integration-for-s3-service-accounts branch from 04d29c3 to 4b97bf6 Compare September 19, 2024 21:17

kubevirt-bot added dco-signoff: yes Indicates the PR's author has DCO signed all their commits. and removed dco-signoff: no Indicates the PR's author has not DCO signed all their commits. labels Sep 19, 2024

mhenriks reviewed Sep 25, 2024

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created internal flag to identify when to use aws chain auth

69501ee

Signed-off-by: russellcain <[email protected]>

mhenriks reviewed Oct 8, 2024

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[WIP] 3026: Add support for s3 data importer inheriting service account credentials #3433

[WIP] 3026: Add support for s3 data importer inheriting service account credentials #3433

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[WIP] 3026: Add support for s3 data importer inheriting service account credentials #3433

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