Nicolas Williams 15b2094079 hx509: Add Heimdal cert ext for ticket max_life ...

This adds support for using a Heimdal-specific PKIX extension to derive
a maximum Kerberos ticket lifetime from a client's PKINIT certificate:

 - a `--pkinit-max-life` to the `hxtool ca` command
 - `hx509_ca_tbs_set_pkinit_max_life()`
 - `hx509_cert_get_pkinit_max_life()`
 - `HX509_CA_TEMPLATE_PKINIT_MAX_LIFE`

There are two extensions.  One is an EKU, which if present means that
the maximum ticket lifetime should be derived from the notAfter minus
notBefore.  The other is a certificate extension whose value is a
maximum ticket lifetime in seconds.  The latter is preferred.

2021-03-24 19:12:00 -05:00

23 KiB

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