Some IPsec implementations such as OpenIKED require SubjectAlternativeName
data on certificates and refuse to establish connections otherwise.
The StrongSwan project also recommends it (see:
https://wiki.strongswan.org/projects/strongswan/wiki/SimpleCA) although
it is currently not enforced by their IPsec software.
For convenience purposes and to raise awareness, this patch adds a default
SubjectAlternativeName based on the machines hostname or IP address. Existing
certificates remain unchanged for obvious reasons.
The third version of this patch fixes a duplicate DNS query reported by Michael.
Fixes#11594
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Cc: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
993724b4dd