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update the header fuzzer

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This commit is contained in:
Marten Seemann 2020-08-06 14:52:31 +07:00
parent c88ce801ac
commit e848fc4f6a
1 changed files with 27 additions and 5 deletions
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32
fuzzing/header/fuzz.go
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@ -19,7 +19,9 @@ func Fuzz(data []byte) int {
connIDLen := int(data[0] % 21) connIDLen := int(data[0] % 21)
data = data[1:] data = data[1:]
isVNP := wire.IsVersionNegotiationPacket(data) if wire.IsVersionNegotiationPacket(data) {
return fuzzVNP(data)
}
connID, err := wire.ParseConnectionID(data, connIDLen) connID, err := wire.ParseConnectionID(data, connIDLen)
if err != nil { if err != nil {
return 0 return 0
@ -48,17 +50,37 @@ func Fuzz(data []byte) int {
// We are able to parse packets with connection IDs longer than 20 bytes, // We are able to parse packets with connection IDs longer than 20 bytes,
// but in QUIC version 1, we don't write headers with longer connection IDs. // but in QUIC version 1, we don't write headers with longer connection IDs.
if hdr.DestConnectionID.Len() <= protocol.MaxConnIDLen && if hdr.DestConnectionID.Len() <= protocol.MaxConnIDLen &&
hdr.SrcConnectionID.Len() <= protocol.MaxConnIDLen && hdr.SrcConnectionID.Len() <= protocol.MaxConnIDLen {
hdr.OrigDestConnectionID.Len() <= protocol.MaxConnIDLen {
panic(err) panic(err)
} }
return 0 return 0
} }
// GetLength is not implemented for Retry and Version Negotiation. // GetLength is not implemented for Retry packets
if !isVNP && hdr.Type != protocol.PacketTypeRetry { if hdr.Type != protocol.PacketTypeRetry {
if expLen := extHdr.GetLength(version); expLen != protocol.ByteCount(b.Len()) { if expLen := extHdr.GetLength(version); expLen != protocol.ByteCount(b.Len()) {
panic(fmt.Sprintf("inconsistent header length: %#v. Expected %d, got %d", extHdr, expLen, b.Len())) panic(fmt.Sprintf("inconsistent header length: %#v. Expected %d, got %d", extHdr, expLen, b.Len()))
} }
} }
return 0 return 0
} }
func fuzzVNP(data []byte) int {
connID, err := wire.ParseConnectionID(data, 0)
if err != nil {
return 0
}
hdr, versions, err := wire.ParseVersionNegotiationPacket(bytes.NewReader(data))
if err != nil {
return 0
}
if !hdr.DestConnectionID.Equal(connID) {
panic("connection IDs don't match")
}
if len(versions) == 0 {
panic("no versions")
}
if _, err := wire.ComposeVersionNegotiation(hdr.SrcConnectionID, hdr.DestConnectionID, versions); err != nil {
panic(err)
}
return 0
}