OCPBUGS-115307: bugfix: default to english when Accept-Language header contains more than 1000 underscores - #253
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughThe locale resolver now counts hyphen and underscore separators in ChangesLocale header validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This localized change is merge-ready after normal checks and review; no actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
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Full details: Title checkExplanation The title clearly identifies the bug fix and the primary condition: defaulting to English when Accept-Language contains more than 1,000 underscores. The changes also cover hyphens and mixed separators, but the title does not need to list every covered case. Full details: Stable And Deterministic Test NamesExplanation PASS: The pull request adds three Go table-test names passed through Full details: Test Structure And QualityExplanation PASS: The changed test code is standard Go Full details: Microshift Test CompatibilityExplanation PASS: The pull request changes only Full details: Single Node Openshift (Sno) Test CompatibilityExplanation PASS: The pull request adds only standard Go table-driven coverage in Full details: Topology-Aware Scheduling CompatibilityExplanation PASS — The pull request changes only locale parsing code and locale tests. The complete diff contains no deployment manifests, operator code, controllers, or scheduling constraints. The topology-aware scheduling check is therefore not applicable. Full details: Ote Binary Stdout ContractExplanation The pull request does not violate the OTE Binary Stdout Contract. The changes add klog.V(5).Infof() calls inside the getPreferredLang() function, which is not process-level code. klog writes to stderr by default, not stdout. The modifications do not contain any fmt.Print*(), os.Stdout writes, or other direct stdout output that would corrupt JSON communication in process-level code contexts (main, init, TestMain, BeforeSuite, AfterSuite, or top-level initializers). Test code modifications are explicitly excluded from this check. Full details: Ipv6 And Disconnected Network Test CompatibilityExplanation PASS — The pull request changes only locale production code and a standard Go Full details: No-Weak-CryptoExplanation PASS. The PR changes only Accept-Language parsing and its tests. Added code imports Full details: Container-PrivilegesExplanation PASS: The pull request changes only Full details: No-Sensitive-Data-In-LogsExplanation PASS. The only added log call in
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In `@pkg/server/locales/locales.go`:
- Line 37: Update the accept-language validation around the separator-count
check in the locale parsing flow to count both hyphen and underscore separators
toward the 1,000 limit before normalization. Add a regression test covering a
header that mixes both separator types and verifies it is rejected.
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pkg/server/locales/locales.gopkg/server/locales/locales_test.go
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@everettraven I'll let you decide on the two outstanding issues (my comment below, and the one from @coderabbitai, I won't block the PR on either.
/lgtm
/hold
| { | ||
| name: "Test 'Accept-Language' request header with too many underscores, so defaults to English language", | ||
| header: strings.Repeat("_", 2000), | ||
| locale: locale_en, | ||
| }, |
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This test passes even without the new guard; ParseAcceptLanguage() would return an error because the value isn't a valid language. I understand that the test now passes because of the new guard, but I'm worried about regressions if e.g. we break the guard accidentally.
However, to be honest, I don't know whether it's possible to write a test that will help prevent such regressions, because the function's output doesn't help distinguish the cases (unless we capture and check the logged error somehow).
Therefore I won't block the PR on this.
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Yeah, without a refactor here such that the function actually returns an error case I'm not sure there is a way to reliably prove that we are testing the exact path we are intending other than making sure we are getting our fallback language.
In order to properly test this here, we would have to construct a language header with >1000 language tags separated by _ and I'm not sure that is actually possible without significantly more work (I don't think go is aware of that many language tags).
I'm not sure the additional verification is worth the squeeze here but 🤷
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| // characters in the Accept-Language header. | ||
| // This can be removed once we have updated the language dependency to a version | ||
| // that has fixed this issue. | ||
| if strings.Count(acceptLangHeader, "_") > 1000 { |
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Why do we count up to a 1000 "_"? I know we copy-pasted it from a PR on upstream Go, but still makes me wonder. In our case more than 2 would be odd, wouldn't it be? Lets say then count till 10... but 1000?
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I'm following the same reasoning as the original fix for this issue that added a cap to the number of hyphens - golang/text@434eadc
TLDR; My understanding is that it is long enough for common use cases with significant buffer room to ideally not break potential edge cases that need more than a handful of tags. It seems like the cap of 1000 successfully mitigates the DoS attack vector while limiting the potential for breaking uses of it.
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We don't necessarily have the same concerns, but I'd rather be consistent with what upstream Go has decided so we can just adopt whatever fix goes into the package later.
…than 1000 underscores to prevent a quadratic-time denial-of-service attack from spending a significant amount of time attempting to parse the acceptable languages from the request header. Signed-off-by: Bryce Palmer <bpalmer@redhat.com>
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to prevent a quadratic-time denial-of-service attack from spending a significant amount of time attempting to parse the acceptable languages from the request header.
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