fix(security): block empty egress hostnames - #4060
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🚧 Files skipped from review as they are similar to previous changes (2)
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Merge Risk: ⚪ Minimal · up to This localized change blocks empty or whitespace-only egress hostnames while preserving valid-host behavior, with targeted tests passing; no actionable merge-blocking risk remains after normal checks and review. Warning There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure. 🔧 ESLint
mcpjam-inspector/server/utils/__tests__/hosted-egress-guard.test.tsOops! Something went wrong! :( ESLint: 8.57.1 Error: ESLint configuration in --config is invalid:
mcpjam-inspector/server/utils/hosted-egress-guard.tsESLint skipped: the matched ESLint configuration already failed (config-incompatibility). Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Actionable comments posted: 1
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Inline comments:
In `@mcpjam-inspector/server/utils/__tests__/hosted-egress-guard.test.ts`:
- Around line 7-15: Add regression assertions in the isBlockedEgressHost test
covering whitespace-only hostnames such as spaces and tab/newline combinations,
and verify each is blocked. Keep the existing empty-string assertion and test
scope unchanged.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (2)
mcpjam-inspector/server/utils/__tests__/hosted-egress-guard.test.tsmcpjam-inspector/server/utils/hosted-egress-guard.ts
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Hi @matteo8p , The requested CodeRabbit feedback has been addressed, including regression coverage for whitespace-only hostnames (" " and "\t\n"), and the focused test suite is passing. I also noticed that the required Build and Test and Run Tests workflows are currently waiting for approval, and GitHub indicates that a maintainer approval is required before the PR can be merged. Whenever you get a chance, could you please approve the pending workflows and review the PR? Thanks! 🙏 |
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Summary
Fixes #4058.
isBlockedEgressHost()previously treated an empty hostname as allowed after trimming and removing trailing dots. This changes the behavior to fail closed and treat an empty hostname as blocked.A regression test was added for the empty-hostname case.
Validation
npm run test -w @mcpjam/inspector -- server/utils/__tests__/hosted-egress-guard.test.tsgit diff --checkpassedOnly the two intended files are included in the commit.
Summary by cubic
Blocks empty and whitespace-only egress hostnames. Before: empty hosts were allowed after trim and trailing-dot removal. Now: they are blocked, so the guard fails closed and whitespace/trailing-dot bypasses are prevented.
isBlockedEgressHostreturns true when the normalized host is empty; adds unit tests for "", " ", and "\t\n" in@mcpjam/inspector.Written for commit 8642ff3. Summary will update on new commits.