67d0ce8843
It has been demonstrated that tolerating an unbounded number of dnssec signature validations is a bad idea. It is easy for a maliciously crafted DNS reply to contain as many keytag collisions as desired, causing us to iterate every dnskey and signature combination in vain. The solution is to impose a maximum number of validations we will tolerate. While collisions are not hard to craft, I still expect they are unlikely in the wild so it should be safe to pick fairly small values. Here two limits are imposed: one on the maximum number of invalid signatures encountered per rrset, and another on the total number of validations performed per transaction.
System and Service Manager
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