The mod is born

init.lua

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+minetest.register_privilege("no_knockback", {
+	description = "Knockback does not affect players with this priv",
+	give_to_singleplayer = false,
+	give_to_admin = true,
+})
+
+minetest.register_on_punchplayer(function(player, _, _, tool, dir, damage)
+	if minetest.check_player_privs(player, {no_knockback = false}) and player:get_hp() > 0 then
+		if dir.y <= 0 then
+			dir.y = -dir.y
+		end
+
+		if damage >= 3 then damage = 3 end
+		if damage < 1 then return end
+
+		local kback = damage or tool.damage_groups.knockback
+
+		local pos = player:get_pos()
+		pos.y = pos.y + 0.4
+		local dest = vector.add(pos, vector.multiply(dir, kback/2.4))
+		local ray = minetest.raycast(pos, dest, false, false)
+		dir.y = 0
+
+		local pointed = ray:next()
+
+		if pointed == nil then
+			local backdir = vector.divide(dir, -2)
+
+			player:move_to(vector.add(dest, backdir), false)
+		elseif pointed.above then
+			local backdir = vector.divide(dir, -50)
+			player:move_to(vector.add(pointed.above, backdir), false)
+		end
+	end
+end)

mod.conf

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+name = knockback