59 lines
2.1 KiB
Lua
59 lines
2.1 KiB
Lua
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function loadaliasesfromfile()
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local env = { alias = {} }
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local f,err = loadfile("/etc/powerdns/updatepolicy.aliases", "t", env)
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if f then
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f() -- run the loaded code in the prepared env for safety reasons
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pdnslog("Successfully loaded alias config", pdns.loglevels.Debug)
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else
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pdnslog("Failed to load alias config: "..err, pdns.loglevels.Warning)
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end
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return env.alias
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end
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function getacmedomains(domain)
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-- Add domain as the first entry to the list
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local domains = {[0] = "_acme-challenge."..domain}
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local counter = 1
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-- Load additional alias domains from config file
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local aliases = loadaliasesfromfile()
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if aliases[domain] ~= nil then
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for _,alias in pairs(aliases[domain]) do
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domains[counter] = "_acme-challenge."..alias
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counter = counter + 1
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end
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end
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-- Return all challenge domains
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return domains
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end
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function updatepolicy(input)
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-- Check for valid TSIG key or fail
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local key = input:getTsigName()
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local keyname = nil
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if key == nil or not pcall(function() keyname = key:toString() end) or keyname == "" then
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-- fail on no key (and work around the possible odd exception with pcall)
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pdnslog("No TSIG key found. Update rejected.", pdns.loglevels.Error)
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return false
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end
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-- Process ACME keys
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local pos,_,domain = string.find(keyname, "^acme%-(.+)")
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if pos ~= nil then
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for _,acmedomain in pairs(getacmedomains(domain)) do
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pdnslog("Validating against "..acmedomain, pdns.loglevels.Debug)
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if input:getQType() == pdns.TXT and input:getQName():toString():lower() == acmedomain:lower() then
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-- valid acme key with matching domain matches name and TXT
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pdnslog("ACME TSIG '"..keyname.."' key found and request matches domain or known aliases. Update permitted.")
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return true
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end
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end
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-- acme key and no valid match
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pdnslog("ACME TSIG '"..keyname.."' key found but request does not match domain or known aliases. Update rejected.", pdns.loglevels.Error)
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return false
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end
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-- Process other keys with the normal default policy result
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pdnslog("TSIG Key '"..keyname.."' found. Update permitted.")
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return true
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end
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