drop http public key pinning
http PKP has been deprecated and removed from many browsers already.
We should stop sending that header.
I propose a 2 stage process:
- get clients that visit us regularly to drop their cached pin
- after all pins would also have expired, stop sending the header entirely.
for 1, something like this
--- a/modules/apache2/templates/ssl-key-pins.erb
+++ b/modules/apache2/templates/ssl-key-pins.erb
@@ -24,7 +24,9 @@
if pin_info.size >= 2 then
pin_info = pin_info.map{ |x| x.gsub('"', '\"') }
# 60 days
- pin_info << "max-age=5184000"
+ #pin_info << "max-age=5184000"
+ # 0 days, set 2020-03-11, so we can get rid of the header around 2020-05-11.
+ pin_info << "max-age=0"
pin_str = pin_info.join("; ")
res << " Header always set Public-Key-Pins \"#{pin_str}\""
else
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