Tolerate DTLS alerts with an incorrect version number (1.0.2) #5019
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In the case of a protocol version alert being sent by a peer the record version number may not be what we are expecting. In DTLS records with an unexpected version number are silently discarded. This probably isn't appropriate for alerts, so we tolerate a mismatch in the minor version number. This resolves an issue reported on openssl-users where an OpenSSL server chose DTLS1.0 but the client was DTLS1.2 only and sent a protocol_version alert with a 1.2 record number. This was silently ignored by the server.
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In the case of a protocol version alert being sent by a peer the record version number may not be what we are expecting. In DTLS records with an unexpected version number are silently discarded. This probably isn't appropriate for alerts, so we tolerate a mismatch in the minor version number. This resolves an issue reported on openssl-users where an OpenSSL server chose DTLS1.0 but the client was DTLS1.2 only and sent a protocol_version alert with a 1.2 record number. This was silently ignored by the server. Reviewed-by: Viktor Dukhovni <viktor@openssl.org> (Merged from #5019)
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In the case of a protocol version alert being sent by a peer the record
version number may not be what we are expecting. In DTLS records with an
unexpected version number are silently discarded. This probably isn't
appropriate for alerts, so we tolerate a mismatch in the minor version
number.
This resolves an issue reported on openssl-users where an OpenSSL server
chose DTLS1.0 but the client was DTLS1.2 only and sent a protocol_version
alert with a 1.2 record number. This was silently ignored by the server.
This is the 1.0.2 version of PR #5018