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require 'socket'
class FakeAgent
include PacketFu
attr_reader :id, :endpoint
def initialize(id, endpoint)
@id = id
@endpoint = endpoint
end
def watch(directory)
listener = Listen.to(directory, debug: true) do |modified, added, removed|
publish_event(:modified, modified)
publish_event(:added, added)
publish_event(:removed, removed)
(modified + added + removed).flatten.each do |file|
scan_file(file)
end
end
listener.start
sleep
end
def scan(directory)
Dir["Rakefile"].each do |file|
scan_file(file)
end
end
def scan_file(file)
return unless File.file?(file)
case disposition_for(file)
when "malicious"
publish_event(:quarantined, [file])
when "unknown"
puts "file is unknown"
end
end
def sniff(interface)
capture = Capture.new(iface: interface, start: true)
capture.stream.each do |p|
packet = Packet.parse(p)
if packet.is_ip?
next if packet.ip_saddr == Utils.ifconfig(interface)[:ip_saddr]
packet_info = [packet.ip_saddr, packet.ip_daddr, packet.size, packet.proto.last]
puts "%-15s -> %-15s %-4d %s" % packet_info
end
end
end
private
def publish_event(event, files)
files.each do |file|
body = {
event: {
agent_id: id,
name: event,
data: {
fingerprint: fingerprint_for(file),
path: file,
hostname: Socket.gethostname,
ip_addresses: ip_addresses,
}
}
}
Typhoeus.post(event_url, body: body)
end
rescue => e
puts "#{e.message} #{e.backtrace.join(' ')}"
end
def fingerprint_for(file)
return nil unless File.exist?(file)
result = `shasum -a 256 #{file}`
sha, * = result.split(' ')
sha
end
def ip_addresses
Socket.ip_address_list.find_all { |x| x.ipv4? }.map { |x| x.ip_address }
end
def disposition_for(file)
fingerprint = fingerprint_for(file)
body = {
name: 'lookup',
data: {
fingerprint: fingerprint,
path: File.expand_path(file)
}
}
JSON.parse(Typhoeus.get(file_query_url(fingerprint), body: body).body)["state"]
end
def file_query_url(fingerprint)
"#{endpoint}/agents/#{id}/files/#{fingerprint}"
end
def event_url
"#{endpoint}/agents/#{id}/events/"
end
end
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