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use the KEY_UPDATE_ERROR code when the peer updates keys too frequently

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This commit is contained in:
Marten Seemann 2020-09-10 18:14:27 +07:00
parent 10797cfc79
commit 8cb0570cb1
2 changed files with 4 additions and 4 deletions
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4
internal/handshake/updatable_aead.go
View file

@ -182,13 +182,13 @@ func (a *updatableAEAD) Open(dst, src []byte, rcvTime time.Time, pn protocol.Pac
// try opening the packet with the next key phase
dec, err := a.nextRcvAEAD.Open(dst, a.nonceBuf, src, ad)
if err == nil && receivedWrongInitialKeyPhase {
return nil, qerr.NewError(qerr.ProtocolViolation, "wrong initial key phase")
return nil, qerr.NewError(qerr.KeyUpdateError, "wrong initial key phase")
} else if err != nil {
return nil, ErrDecryptionFailed
}
// Opening succeeded. Check if the peer was allowed to update.
if a.firstSentWithCurrentKey == protocol.InvalidPacketNumber {
return nil, qerr.NewError(qerr.ProtocolViolation, "keys updated too quickly")
return nil, qerr.NewError(qerr.KeyUpdateError, "keys updated too quickly")
}
a.rollKeys()
// The peer initiated this key update. It's safe to drop the keys for the previous generation now.

4
internal/handshake/updatable_aead_test.go
View file

@ -208,7 +208,7 @@ var _ = Describe("Updatable AEAD", func() {
client.rollKeys()
encrypted := client.Seal(nil, msg, 0x1337, ad)
_, err := server.Open(nil, encrypted, time.Now(), 0x1337, protocol.KeyPhaseOne, ad)
Expect(err).To(MatchError("PROTOCOL_VIOLATION: wrong initial key phase"))
Expect(err).To(MatchError("KEY_UPDATE_ERROR: wrong initial key phase"))
})
It("only errors when the peer starts with key phase 1 if decrypting the packet succeeds", func() {
@ -228,7 +228,7 @@ var _ = Describe("Updatable AEAD", func() {
client.rollKeys()
encrypted1 := client.Seal(nil, msg, 0x42, ad)
_, err = server.Open(nil, encrypted1, time.Now(), 0x42, protocol.KeyPhaseOne, ad)
Expect(err).To(MatchError("PROTOCOL_VIOLATION: keys updated too quickly"))
Expect(err).To(MatchError("KEY_UPDATE_ERROR: keys updated too quickly"))
})
})