1 files changed, 236 insertions, 0 deletions
diff --git a/daemon/lua/trust_anchors.test/webserv.lua b/daemon/lua/trust_anchors.test/webserv.lua
new file mode 100644
index 0000000..c108bba
--- /dev/null
+++ b/daemon/lua/trust_anchors.test/webserv.lua
@@ -0,0 +1,236 @@
+-- SPDX-License-Identifier: GPL-3.0-or-later
+
+-- This is a module that does the heavy lifting to provide an HTTP/2 enabled
+-- server that supports TLS by default and provides endpoint for other modules
+-- in order to enable them to export restful APIs and websocket streams.
+-- One example is statistics module that can stream live metrics on the website,
+-- or publish metrics on request for Prometheus scraper.
+local http_server = require('http.server')
+local http_headers = require('http.headers')
+local http_websocket = require('http.websocket')
+local http_util = require "http.util"
+local x509, pkey = require('openssl.x509'), require('openssl.pkey')
+
+-- Module declaration
+local M = {}
+
+-- Export HTTP service endpoints
+M.endpoints = {
+	['/'] = {'text/html', 'test'},
+}
+
+-- Serve known requests, for methods other than GET
+-- the endpoint must be a closure and not a preloaded string
+local function serve(endpoints, h, stream)
+	local hsend = http_headers.new()
+	local path = h:get(':path')
+	local entry = endpoints[path]
+	if not entry then -- Accept top-level path match
+		entry = endpoints[path:match '^/[^/?]*']
+	end
+	-- Unpack MIME and data
+	local data, mime, ttl, err
+	if entry then
+		mime = entry[1]
+		data = entry[2]
+		ttl = entry[4]
+	end
+	-- Get string data out of service endpoint
+	if type(data) == 'function' then
+		local set_mime, set_ttl
+		data, err, set_mime, set_ttl = data(h, stream)
+		-- Override default endpoint mime/TTL
+		if set_mime then mime = set_mime end
+		if set_ttl then ttl = set_ttl end
+		-- Handler doesn't provide any data
+		if data == false then return end
+		if type(data) == 'number' then return tostring(data), err end
+	-- Methods other than GET require handler to be closure
+	elseif h:get(':method') ~= 'GET' then
+		return '501', ''
+	end
+	if not mime or type(data) ~= 'string' then
+		return '404', ''
+	else
+		-- Serve content type appropriately
+		hsend:append(':status', '200')
+		hsend:append('content-type', mime)
+		hsend:append('content-length', tostring(#data))
+		if ttl then
+			hsend:append('cache-control', string.format('max-age=%d', ttl))
+		end
+		assert(stream:write_headers(hsend, false))
+		assert(stream:write_chunk(data, true))
+	end
+end
+
+-- Web server service closure
+local function route(endpoints)
+	return function (_, stream)
+		-- HTTP/2: We're only permitted to send in open/half-closed (remote)
+		local connection = stream.connection
+		if connection.version >= 2 then
+			if stream.state ~= 'open' and stream.state ~= 'half closed (remote)' then
+				return
+			end
+		end
+		-- Start reading headers
+		local h = assert(stream:get_headers())
+		local m = h:get(':method')
+		local path = h:get(':path')
+		-- Upgrade connection to WebSocket
+		local ws = http_websocket.new_from_stream(stream, h)
+		if ws then
+			assert(ws:accept { protocols = {'json'} })
+			-- Continue streaming results to client
+			local ep = endpoints[path]
+			local cb = ep[3]
+			if cb then
+				cb(h, ws)
+			end
+			ws:close()
+			return
+		else
+			local ok, err, reason = http_util.yieldable_pcall(serve, endpoints, h, stream)
+			if not ok or err then
+				print(string.format('%s err %s %s: %s (%s)', os.date(), m, path, err or '500', reason))
+				-- Method is not supported
+				local hsend = http_headers.new()
+				hsend:append(':status', err or '500')
+				if reason then
+					assert(stream:write_headers(hsend, false))
+					assert(stream:write_chunk(reason, true))
+				else
+					assert(stream:write_headers(hsend, true))
+				end
+			else
+				print(string.format('%s ok  %s %s', os.date(), m, path))
+			end
+		end
+	end
+end
+
+-- @function Prefer HTTP/2 or HTTP/1.1
+local function alpnselect(_, protos)
+	for _, proto in ipairs(protos) do
+		if proto == 'h2' or proto == 'http/1.1' then
+			return proto
+		end
+	end
+	return nil
+end
+
+-- @function Create TLS context
+local function tlscontext(crt, key)
+	local http_tls = require('http.tls')
+	local ctx = http_tls.new_server_context()
+	if ctx.setAlpnSelect then
+		ctx:setAlpnSelect(alpnselect)
+	end
+	assert(ctx:setPrivateKey(key))
+	assert(ctx:setCertificate(crt))
+	return ctx
+end
+
+-- @function Listen on given HTTP(s) host
+function M.add_interface(conf)
+	local crt, key
+	if conf.tls ~= false then
+		assert(conf.cert, 'cert missing')
+		assert(conf.key, 'private key missing')
+		-- Check if a cert file was specified
+		-- Read x509 certificate
+		local f = io.open(conf.cert, 'r')
+		if f then
+			crt = assert(x509.new(f:read('*all')))
+			f:close()
+			-- Continue reading key file
+			if crt then
+				f = io.open(conf.key, 'r')
+				key = assert(pkey.new(f:read('*all')))
+				f:close()
+			end
+		end
+		-- Check loaded certificate
+		assert(crt and key,
+		       string.format('failed to load certificate "%s"', conf.cert))
+	end
+	-- Compose server handler
+	local routes = route(conf.endpoints or M.endpoints)
+	-- Check if UNIX socket path is used
+	local addr_str
+	if not conf.path then
+		conf.host = conf.host or 'localhost'
+		conf.port = conf.port or 8453
+		addr_str = string.format('%s@%d', conf.host, conf.port)
+	else
+		if conf.host or conf.port then
+			error('either "path", or "host" and "port" must be provided')
+		end
+		addr_str = conf.path
+	end
+	-- Create TLS context and start listening
+	local s, err = http_server.listen {
+		-- cq = worker.bg_worker.cq,
+		host = conf.host,
+		port = conf.port,
+		path = conf.path,
+		v6only = conf.v6only,
+		unlink = conf.unlink,
+		reuseaddr = conf.reuseaddr,
+		reuseport = conf.reuseport,
+		client_timeout = conf.client_timeout or 5,
+		ctx = crt and tlscontext(crt, key),
+		tls = conf.tls,
+		onstream = routes,
+		-- Log errors, but do not throw
+		onerror = function(myserver, context, op, err, errno) -- luacheck: ignore 212
+			local msg = '[http] ' .. op .. ' on ' .. tostring(context) .. ' failed'
+			if err then
+				msg = msg .. ': ' .. tostring(err)
+			end
+			print(msg)
+		end,
+	}
+	-- Manually call :listen() so that we are bound before calling :localname()
+	if s then
+		err = select(2, s:listen())
+	end
+	assert(not err, string.format('failed to listen on %s: %s', addr_str, err))
+	return s
+end
+
+-- init
+local files = {
+	'ok0_badtimes.xml',
+	'ok1.xml',
+	'ok1_expired1.xml',
+	'ok1_notyet1.xml',
+	'ok2.xml',
+	'err_attr_validfrom_missing.xml',
+	'err_attr_validfrom_invalid.xml',
+	'err_attr_extra_attr.xml',
+	'err_elem_missing.xml',
+	'err_elem_extra.xml',
+	'err_multi_ta.xml',
+	'unsupp_nonroot.xml',
+	'unsupp_xml_v11.xml'
+}
+
+-- Export static pages specified at command line
+for _, name in ipairs(files) do
+	local fd = io.open(name)
+	assert(fd, string.format('unable to open file "%s"', name))
+	M.endpoints['/' .. name] = { 'text/xml', fd:read('*a') }
+	fd:close()
+end
+
+local server = M.add_interface({
+	host = 'localhost',
+	port = 8080,
+	tls = true,
+	cert = 'x509/server.pem',
+	key = 'x509/server-key.pem'
+	})
+
+server:loop()