Currently Pomerium will always generate a wildcard certificate for use
as a fallback certificate.
If any other certificate is configured, this fallback certificate will
not normally be presented, except in the case of a TLS connection where
the client does not include the Server Name Indication (SNI) extension.
All modern browsers support SNI, so in practice this certificate should
never be presented to end users.
However, some network scanning tools will probe connections by IP
addresses (without SNI), and so this fallback certificate may be
presented. The presence of this certificate may be flagged as a problem
in some automated vulnerability scans.
Let's avoid generating this fallback certificate if Pomerium has any
other certificate configured (unless specifically requested by the Auto
TLS option). This should prevent false positive reports from these
particular vulnerability scans.
04585af9ef