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Harden create-env agent passwords in cloud metadata - #742
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughStemcell manifests now include optional agent-feature metadata. When a stemcell advertises Suggested reviewers: Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 6 files. (1 skipped: 1 … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly summarizes the primary change: hardening create-env agent passwords in cloud metadata. Description check The description directly explains the password hashing behavior, affected metadata fields, dependency update, release ordering, and test coverage. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 6 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Linting is failing, you need to run goimports most likely |
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Codex agent here. Fixed the two goimports failures and pushed the correction. Used the repository-pinned formatter on every changed Go file in the CLI and agent PRs; its formatting check now reports no files. |
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🟡 Changes recommended
The required tagged bosh-agent release is unavailable, and the pinned draft API has already changed upstream.
1 open finding
What changed in this PR
Hardens create-env by replacing agent passwords in VM metadata with feature-gated HMAC-SHA256 verifiers.
Changes:
- Adds stemcell agent-feature detection.
- Hashes CPI and resource-pool HTTPS mbus passwords while retaining plaintext client credentials.
- Adds tests and vendors the bosh-agent hashing package.
| File | Description |
|---|---|
cmd/agent_password.go |
Implements metadata password hashing. |
cmd/agent_password_test.go |
Tests hashing helpers and errors. |
cmd/create_env_test.go |
Tests feature-gated create-env behavior. |
cmd/deployment_preparer.go |
Applies hashing after change detection. |
stemcell/stemcell.go |
Exposes advertised agent features. |
stemcell/agent_features_test.go |
Tests feature parsing and preservation. |
go.mod |
Adds the bosh-agent pseudo-version dependency. |
go.sum |
Updates dependency checksums. |
vendor/modules.txt |
Registers the vendored package. |
vendor/github.com/cloudfoundry/bosh-agent/v2/agentpassword/agentpassword.go |
Vendors verifier generation logic. |
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Codex agent here. Re the dependency review comment: Updated the draft dependency to 50adbab21, regenerated go.sum/vendor, and changed the specs to ParseHashedPassword in 25cd17c. The affected specs compile. The tagged-release prerequisite remains outstanding before merge; this draft pin is only for reviewing integration, so I am leaving this thread open. |
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Codex agent here. Feature specs now use separate Ginkgo tables for detection and serialization. Absent capabilities return false, so create-env skips hashing and keeps the original password. The specs compile. Posting here while the review is pending. |
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @cmd/deployment_preparer.go:
- Around line 210-215: Replace the loop over all
deploymentManifest.ResourcePools with a lookup of the resource pool selected by
deploymentManifest.JobName(), using the same ResourcePool helper and selection
semantics as deployment/vm/manager.go passes to CreateVM. Call
hashResourcePoolMbusURLs only on that selected pool’s Env and preserve the
existing wrapped error handling.
Review comments at @go.mod:
- Line 9: Replace the github.com/cloudfoundry/bosh-agent/v2 pseudo-version in
go.mod with the tagged release containing bosh-agent#487, then regenerate the
corresponding go.sum entries to match.
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⛔ Files ignored due to path filters: 3
go.sumis excluded by!**/*.sumvendor/github.com/cloudfoundry/bosh-agent/v2/agentpassword/agentpassword.gois excluded by!vendor/**vendor/modules.txtis excluded by!vendor/**
📒 Files selected for processing: 7
cmd/agent_password.gocmd/agent_password_test.gocmd/create_env_test.gocmd/deployment_preparer.gogo.modstemcell/agent_features_test.gostemcell/stemcell.go
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create-env passes cloud_provider.properties.agent.mbus to the CPI. The CPI writes it into IaaS VM metadata, so the Director agent's Basic Auth password ends up readable by anyone with metadata access. When the stemcell's stemcell.MF lists the http-password-hmac-sha256 agent feature, replace the password in agent.mbus, and in any resource pool env.bosh.mbus.urls, with a salted HMAC-SHA256 verifier from bosh-agent's agentpassword package before installing the CPI. The CLI keeps using the plaintext cloud_provider.mbus to talk to the agent, so only the copy that reaches the VM is hashed. Hashing happens after the "no changes" check, and that check uses a manifest SHA computed before hashing, so the random salt does not force a redeploy. Compatibility: - New CLI, stemcell without the feature: nothing is hashed. - Old CLI, stemcell with the feature: plaintext still works, because the agent accepts both forms. ai-assisted=yes TNZ-129825 Co-Authored-By: Chris Selzo <chris.selzo@broadcom.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Update the agent dependency and tracked vendor copy together with the parser references in the command specs. This brings the shared password-length validation into create-env. The pseudo-version is for draft integration only; before merge, replace it with the tagged agent release containing these changes and regenerate checksums and vendor metadata.
Use Ginkgo table entries so each metadata case reports separately. Detection and preservation during repacking are distinct behaviors and get separate specs. Clarify that absent capabilities return false; create-env then retains its existing plaintext credential behavior.
Use the merged bosh-agent#487 commit after rebasing onto current main. Regenerate module checksums and vendor metadata, retaining all other dependency versions from main. A tagged agent release containing #487 is still required before merge. ai-assisted=yes TNZ-129825
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Keep hashing every resource pool, including unused pools, so each HTTPS mbus URL receives a password verifier. Document the all-pools policy and expand the create-env regression test to two pools with two URLs each. Check every verifier against its original password while preserving the plaintext mbus used by the CLI client. ai-assisted=yes TNZ-129825
Replace the merged-commit pseudo-version with v2.910.0, which points at the same agent commit and satisfies the tagged-release prerequisite. Regenerate go.sum and vendor metadata without changing package sources or unrelated dependencies. ai-assisted=yes TNZ-129825
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julians approval got cleared when i fixed the go mod |
github-project-automation
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moved this from Pending Merge | Prioritized
to Done
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Why
create-envputscloud_provider.properties.agent.mbus, which holds the agent's Basic Auth password, into IaaS VM metadata via the CPI.What
stemcell.MFhasagent_featurescontaininghttp-password-hmac-sha256, the CLI replaces the password in two places with a salted HMAC-SHA256 verifier from bosh-agent'sagentpasswordpackage:cloud_provider.properties.agent.mbusenv.bosh.mbus.urlscloud_provider.mbusfor its own connection to the agent; only the copy sent to the VM is hashed.Dependency
github.com/cloudfoundry/bosh-agent/v2/agentpassword.go.modpins bosh-agent to tagged releasev2.910.0, which contains the merged changes from bosh-agent#487 (52d5577b5e24).Release ordering
Tests
New tests:
cmd/agent_password_test.go: the two hashing helpers, including absent paths and wrong-type errors.cmd/create_env_test.go: with the feature, the CPI installer receives the hashedagent.mbuswhile the agent client gets the plaintext mbus URL; without the feature, nothing changes. The resource-pool test covers two URLs in each of two pools, including an unused pool, and verifies all four hashes against their original passwords.Note: unset any
BOSH_*environment variables (e.g.BOSH_ALL_PROXY) before runningcmdtests locally. Unrelated curl/session specs fail when they are set.Related
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