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Clarify what to do when ALPN negotiation fails #2483

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merged 5 commits into from
Mar 19, 2019
Merged

Clarify what to do when ALPN negotiation fails #2483

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8a324cf
Clarify what to do when ALPN negotiation fails
ghedo Feb 20, 2019
da213ba
Clarify that no_application_protocol must also be used by clients
ghedo Feb 27, 2019
7fc379f
Specify error code for no_application_protocol
ghedo Mar 4, 2019
679bfed
Apply Jana's suggestions from review
janaiyengar Mar 13, 2019
da3ed6a
Fix lint errors
ghedo Mar 14, 2019
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8 changes: 6 additions & 2 deletions draft-ietf-quic-tls.md
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Expand Up @@ -1215,8 +1215,12 @@ QUIC requires that the cryptographic handshake provide authenticated protocol
negotiation. TLS uses Application Layer Protocol Negotiation (ALPN)
{{!RFC7301}} to select an application protocol. Unless another mechanism is
used for agreeing on an application protocol, endpoints MUST use ALPN for this
purpose. When using ALPN, endpoints MUST abort a connection if an application
protocol is not negotiated.
purpose. When using ALPN, endpoints MUST immediately close a connection (see
Section 10.3 in {{QUIC-TRANSPORT}}) if an application protocol is not
negotiated with a no_application_protocol TLS alert (QUIC error code 0x178,
see {{tls-errors}}). While {{!RFC7301}} only specifies that servers use this
alert, QUIC clients MUST also use it to terminate a connection when ALPN
negotiation fails.

An application-layer protocol MAY restrict the QUIC versions that it can operate
over. Servers MUST select an application protocol compatible with the QUIC
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