Aside from using browser headers, I want to blacklist/whitelist browser and plugins from my site so that I can prevent these older unpatched systems from (1) being a general user of my site (2) ...
There seem to be so many ways to create nefarious input that white-listing what input is good usually feels like the safer, simpler option. For instance, one can fairly easily craft a white list ...
Short version: Are you aware of any proxy or firewall device which will permit outbound SSL connections to hosts with approved* SSL certificates only? Long version: Consider the following scenario....