OpenACS

- use "-samesite strict" per default on signed cookies

Background from NaviServer commit:

ns_setcookie: add flag "-samesite" with values "strict|lax|none"

When the flag is set it prevents the browser from

sending this cookie along with cross-site requests to mitigate cross site

scripting attacks. Permissible values are [term strict], [term lax],

or [term none] (default). While the value [term strict] prevents

sending the cookie to the target site in all cross-site browsing

context, the value of [term lax] allows sending the cookie when the

user clicks on regular links. For details, see

https://www.owasp.org/index.php/SameSite

This cookie flag is not yet part of an RFC, but most major browsers

support it. Browsers that do not support it, ignore the flag

silently (see https://caniuse.com/#search=samesite).

Although most cookies should probably use the flags, in order to

provide backward compatibility, the flag can't be activated by

default on all cookies.

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