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return an error when parsing a too long connection ID from a header (#3533)

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Marten Seemann 2022-08-30 14:08:41 +03:00 • committed by GitHub
parent 7023b52e13
commit 31995601a9
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2 changed files with 12 additions and 0 deletions
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3
internal/wire/header.go
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@ -29,6 +29,9 @@ func ParseConnectionID(data []byte, shortHeaderConnIDLen int) (protocol.Connecti
return protocol.ConnectionID{}, io.EOF
}
destConnIDLen := int(data[5])
if destConnIDLen > protocol.MaxConnIDLen {
return protocol.ConnectionID{}, protocol.ErrInvalidConnectionIDLen
}
if len(data) < 6+destConnIDLen {
return protocol.ConnectionID{}, io.EOF
}

9
internal/wire/header_test.go
View file

@ -86,6 +86,15 @@ var _ = Describe("Header Parsing", func() {
Expect(err).To(MatchError(io.EOF))
}
})
It("errors when encountering a too long connection ID", func() {
b := []byte{0x80, 0, 0, 0, 0}
binary.BigEndian.PutUint32(b[1:], uint32(protocol.Version1))
b = append(b, 21) // dest conn id len
b = append(b, make([]byte, 21)...)
_, err := ParseConnectionID(b, 4)
Expect(err).To(MatchError(protocol.ErrInvalidConnectionIDLen))
})
})
Context("identifying 0-RTT packets", func() {