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LookupServer: Verify that DNS response questions match the request

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To protect against DNS spoof attacks, we now check that the questions
in incoming responses match the questions in the request we sent out.

Suggested by @zecke in #10.
This commit is contained in:
Andreas Kling 2020-01-26 13:06:00 +01:00
parent b4d55b16b6
commit 00be9b33b1
4 changed files with 26 additions and 3 deletions
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3
Servers/LookupServer/DNSResponse.cpp
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@ -28,7 +28,6 @@ private:
static_assert(sizeof(DNSRecordWithoutName) == 10);
Optional<DNSResponse> DNSResponse::from_raw_response(const u8* raw_data, size_t raw_size)
{
if (raw_size < sizeof(DNSPacket)) {
@ -79,7 +78,7 @@ Optional<DNSResponse> DNSResponse::from_raw_response(const u8* raw_data, size_t
// FIXME: Parse some other record types perhaps?
dbg() << " data=(unimplemented record type " << record.type() << ")";
}
dbg() << "Answer #" << i << ": type=" << record.type() << ", ttl=" << record.ttl() << ", length=" << record.data_length() << ", data=_" << data << "_";
dbg() << "Answer #" << i << ": name=_" << name << "_, type=" << record.type() << ", ttl=" << record.ttl() << ", length=" << record.data_length() << ", data=_" << data << "_";
response.m_answers.empend(name, record.type(), record.record_class(), record.ttl(), data);
offset += record.data_length();
}