f0c69db15a
Don't use domainToReverseLabels to check if domain names are valid, since it is not particularly performant, and can contribute to DoS vectors. Instead just iterate over the name and enforce the properties we care about. This also enforces that DNS names, both in SANs and name constraints, are valid. We previously allowed invalid SANs, because some intermediates had these weird names (see #23995), but there are currently no trusted intermediates that have this property, and since we target the web PKI, supporting this particular case is not a high priority. Thank you to Jakub Ciolek for reporting this issue. Fixes CVE-2025-58187 For #75681 Fixes #75715 Change-Id: I6ebce847dcbe5fc63ef2f9a74f53f11c4c56d3d1 Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2820 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Roland Shoemaker <bracewell@google.com> Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2981 Commit-Queue: Roland Shoemaker <bracewell@google.com> Reviewed-by: Nicholas Husin <husin@google.com> Reviewed-on: https://go-review.googlesource.com/c/go/+/709848 Auto-Submit: Michael Pratt <mpratt@google.com> TryBot-Bypass: Michael Pratt <mpratt@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org>
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