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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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10
Servers/LookupServer/DNSQuestion.h
View file

@ -16,6 +16,16 @@ public:
u16 class_code() const { return m_class_code; }
const String& name() const { return m_name; }
bool operator==(const DNSQuestion& other) const
{
return m_name == other.m_name && m_record_type == other.m_record_type && m_class_code == other.m_class_code;
}
bool operator!=(const DNSQuestion& other) const
{
return !(*this == other);
}
private:
String m_name;
u16 m_record_type { 0 };