2e31b9eb29
sd-resolved does not support all the permissible DNSSEC signature algorithms, and some are intentionally unsupported as a matter of policy. Answers that can only be validated via unsupported algorithms should be treated as if they were unsigned, per RFC4035 § 5.2. Previously, sd-resolved tried to properly record insecure answers for unsupported algortihms, but did not record this status for each of the auxilliary DNSSEC transactions, so the primary transaction had no way to know if there was a plausible DNSKEY with an unsupported signature algorithm in the chain of trust. This commit adds the insecure DNSKEYs that use unsupported algorithms to the list of validated keys for each transaction, so that dependent transactions can learn that a plausible chain of trust exists, even if no authenticated one does, and report the insecure answer. This should improve the situation in #35126.
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