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module ActionDispatch
class RemoteIp
class IpSpoofAttackError < StandardError ; end
class RemoteIpGetter
def initialize(env, check_ip_spoofing, trusted_proxies)
@env = env
@check_ip_spoofing = check_ip_spoofing
@trusted_proxies = trusted_proxies
end
def remote_addrs
@remote_addrs ||= begin
list = @env['REMOTE_ADDR'] ? @env['REMOTE_ADDR'].split(/[,\s]+/) : []
list.reject { |addr| addr =~ @trusted_proxies }
end
end
def to_s
return remote_addrs.first if remote_addrs.any?
forwarded_ips = @env['HTTP_X_FORWARDED_FOR'] ? @env['HTTP_X_FORWARDED_FOR'].strip.split(/[,\s]+/) : []
if client_ip = @env['HTTP_CLIENT_IP']
if @check_ip_spoofing && !forwarded_ips.include?(client_ip)
# We don't know which came from the proxy, and which from the user
raise IpSpoofAttackError, "IP spoofing attack?!" \
"HTTP_CLIENT_IP=#{@env['HTTP_CLIENT_IP'].inspect}" \
"HTTP_X_FORWARDED_FOR=#{@env['HTTP_X_FORWARDED_FOR'].inspect}"
end
return client_ip
end
return forwarded_ips.reject { |ip| ip =~ @trusted_proxies }.last || @env["REMOTE_ADDR"]
end
end
def initialize(app, check_ip_spoofing = true, trusted_proxies = nil)
@app = app
@check_ip_spoofing = check_ip_spoofing
regex = '(^127\.0\.0\.1$|^(10|172\.(1[6-9]|2[0-9]|30|31)|192\.168)\.)'
regex << "|(#{trusted_proxies})" if trusted_proxies
@trusted_proxies = Regexp.new(regex, "i")
end
def call(env)
env["action_dispatch.remote_ip"] = RemoteIpGetter.new(env, @check_ip_spoofing, @trusted_proxies)
@app.call(env)
end
end
end
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