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kirkchris/CloudFrontRemoteIp.rb

Created April 13, 2016 16:03
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Rails 4 Middleware which extends RemoteIp to provide the correct IP for distributions which are deployed as origins to CloudFront, only strips IPs from list of AWS CloudFront servers.
Raw
application.rb
module ApplicationName
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
config.middleware.insert_before ActionDispatch::RemoteIp, "CloudFrontRemoteIp"
config.middleware.delete "ActionDispatch::RemoteIp"
end
end
Raw
cloudfront-ip-ranges.json
# This file should be updated from AWS and can be found here: http://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html
{
"syncToken": "1455813738",
"createDate": "2016-02-18-17-22-15",
"prefixes": [
{
"ip_prefix": "23.20.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "27.0.0.0/22",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "43.250.192.0/24",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "43.250.193.0/24",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.51.128.0/18",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.51.192.0/20",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.51.216.0/21",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.51.224.0/19",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.137.0.0/17",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.137.128.0/18",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.137.192.0/19",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "46.137.224.0/19",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "50.16.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "50.18.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "50.19.0.0/16",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "50.112.0.0/16",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.0.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.2.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.4.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.8.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.9.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.10.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.12.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.16.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.18.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.20.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.24.0.0/14",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.28.0.0/16",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.29.0.0/16",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.30.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.32.0.0/14",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.36.0.0/14",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.40.0.0/14",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.48.0.0/14",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.52.0.0/15",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.58.0.0/15",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.62.0.0/15",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.64.0.0/17",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.64.128.0/17",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.65.0.0/16",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.67.0.0/16",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.68.0.0/15",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.70.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.72.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.74.0.0/16",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.76.0.0/17",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.76.128.0/17",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.77.0.0/16",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.79.0.0/16",
"region": "ap-northeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.84.0.0/15",
"region": "GLOBAL",
"service": "AMAZON"
},
{
"ip_prefix": "52.86.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.88.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.90.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.0.0/20",
"region": "ap-northeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.16.0/20",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.32.0/22",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.39.0/24",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.40.0/21",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.48.0/22",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.52.0/22",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.56.0/22",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.60.0/22",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.64.0/22",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.68.0/22",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.72.0/22",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.92.252.0/22",
"region": "us-gov-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.93.1.0/24",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.93.8.0/22",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.0.0/22",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.5.0/24",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.6.0/24",
"region": "ap-northeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.7.0/24",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.8.0/24",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.9.0/24",
"region": "us-gov-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.10.0/24",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.11.0/24",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.12.0/24",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.13.0/24",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.14.0/24",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.94.254.0/23",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.30.0/23",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.34.0/24",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.35.0/24",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.36.0/22",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.48.0/22",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.52.0/22",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.56.0/22",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.60.0/24",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.61.0/24",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.62.0/24",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.63.0/24",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.192.0/20",
"region": "ap-northeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.212.0/22",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.240.0/24",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.241.0/24",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.242.0/24",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.243.0/24",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.244.0/24",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.245.0/24",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.246.0/24",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.247.0/24",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.248.0/24",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.249.0/24",
"region": "cn-north-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.252.0/24",
"region": "ap-northeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.0/28",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.16/28",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.32/28",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.48/28",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.64/28",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.80/28",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.96/28",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.112/28",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.128/28",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.95.255.144/28",
"region": "cn-north-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.192.0.0/15",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.196.0.0/14",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.200.0.0/13",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.208.0.0/13",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "52.220.0.0/15",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.64.0.0/15",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.66.0.0/16",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.67.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.68.0.0/14",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.72.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.74.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.76.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.78.0.0/16",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.79.0.0/16",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.80.0.0/13",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.88.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.92.0.0/17",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.92.128.0/17",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.93.0.0/16",
"region": "eu-central-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.94.0.0/16",
"region": "sa-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.95.0.0/16",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.144.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.148.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.150.0.0/16",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.151.0.0/17",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.151.128.0/17",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.152.0.0/16",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.153.0.0/17",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.153.128.0/17",
"region": "ap-southeast-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.154.0.0/16",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.155.0.0/16",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.156.0.0/14",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.160.0.0/13",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.168.0.0/16",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.169.0.0/16",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.170.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.172.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.174.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.176.0.0/15",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.178.0.0/16",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.179.0.0/16",
"region": "ap-southeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.182.0.0/16",
"region": "GLOBAL",
"service": "AMAZON"
},
{
"ip_prefix": "54.183.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.184.0.0/13",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.192.0.0/16",
"region": "GLOBAL",
"service": "AMAZON"
},
{
"ip_prefix": "54.193.0.0/16",
"region": "us-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.194.0.0/15",
"region": "eu-west-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.196.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.198.0.0/16",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.199.0.0/16",
"region": "ap-northeast-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.200.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.202.0.0/15",
"region": "us-west-2",
"service": "AMAZON"
},
{
"ip_prefix": "54.204.0.0/15",
"region": "us-east-1",
"service": "AMAZON"
},
{
"ip_prefix": "54.206.0.0/16",
"region": "ap-southeast-2",
"service": "AMAZON"
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"ip_prefix": "54.255.254.192/26",
"region": "ap-southeast-1",
"service": "ROUTE53_HEALTHCHECKS"
},
{
"ip_prefix": "107.23.255.0/26",
"region": "us-east-1",
"service": "ROUTE53_HEALTHCHECKS"
},
{
"ip_prefix": "176.34.159.192/26",
"region": "eu-west-1",
"service": "ROUTE53_HEALTHCHECKS"
},
{
"ip_prefix": "177.71.207.128/26",
"region": "sa-east-1",
"service": "ROUTE53_HEALTHCHECKS"
},
{
"ip_prefix": "52.84.0.0/15",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.182.0.0/16",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.192.0.0/16",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.230.0.0/16",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.239.128.0/18",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.239.192.0/19",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "54.240.128.0/18",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "204.246.164.0/22",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "204.246.168.0/22",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "204.246.174.0/23",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "204.246.176.0/20",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "205.251.192.0/19",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "205.251.249.0/24",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "205.251.250.0/23",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "205.251.252.0/23",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "205.251.254.0/24",
"region": "GLOBAL",
"service": "CLOUDFRONT"
},
{
"ip_prefix": "216.137.32.0/19",
"region": "GLOBAL",
"service": "CLOUDFRONT"
}
]
}
Raw
CloudFrontRemoteIp.rb
# Note: This code changes in rails 5, so make sure we update before then!
# Written by Chris Kirk at Primer (https://goprimer.com)
class CloudFrontRemoteIp < ActionDispatch::RemoteIp
CLOUDFRONT_IP_RANGES = 'public/cloudfront-ip-ranges.json'.freeze
def call(env)
env["action_dispatch.remote_ip"] = CloudFrontGetIp.new(env, self)
@app.call(env)
end
def self.cloudfront_ips
@@cloudfront_ips ||= (
if File.exist?(CLOUDFRONT_IP_RANGES)
cloudfront_ranges = JSON.parse(File.read(CLOUDFRONT_IP_RANGES)).try(:[], "prefixes") || []
cloudfront_ranges.map { |range| IPAddr.new(range["ip_prefix"]) }
else
[]
end
)
end
class CloudFrontGetIp < GetIp
def calculate_ip
# Set by the Rack web server, this is a single value.
remote_addr = ips_from('REMOTE_ADDR').last
# Could be a CSV list and/or repeated headers that were concatenated.
client_ips = ips_from('HTTP_CLIENT_IP').reverse
forwarded_ips = ips_from('HTTP_X_FORWARDED_FOR').reverse
# only change needed from original code of this function to work with cloudfront
# original code here: https://github.com/rails/rails/blob/a59a9b7f729870de6c9282bd8e2a7ed7f86fc868/actionpack/lib/action_dispatch/middleware/remote_ip.rb#L109
# remove cloudfront ip
remove_cloudfront_ip(forwarded_ips)
# end of changes from original calculate_ip
# +Client-Ip+ and +X-Forwarded-For+ should not, generally, both be set.
# If they are both set, it means that this request passed through two
# proxies with incompatible IP header conventions, and there is no way
# for us to determine which header is the right one after the fact.
# Since we have no idea, we give up and explode.
should_check_ip = @check_ip && client_ips.last && forwarded_ips.last
if should_check_ip && !forwarded_ips.include?(client_ips.last)
# We don't know which came from the proxy, and which from the user
raise ActionDispatch::RemoteIp::IpSpoofAttackError, "IP spoofing attack?! " \
"HTTP_CLIENT_IP=#{@env['HTTP_CLIENT_IP'].inspect} " \
"HTTP_X_FORWARDED_FOR=#{@env['HTTP_X_FORWARDED_FOR'].inspect}"
end
# We assume these things about the IP headers:
#
# - X-Forwarded-For will be a list of IPs, one per proxy, or blank
# - Client-Ip is propagated from the outermost proxy, or is blank
# - REMOTE_ADDR will be the IP that made the request to Rack
ips = [forwarded_ips, client_ips, remote_addr].flatten.compact
# If every single IP option is in the trusted list, just return REMOTE_ADDR
filter_proxies(ips).first || remote_addr
end
# supporting method has been added
def remove_cloudfront_ip(forwarded_ips)
return unless Rails.env.production? || Rails.env.staging?
# TODO: after DNS changes, remove checking via cloudfront_ips and always remove the first ip
# code for this available in this gist: https://gist.github.com/kirkchris/46c84f7fbe9b89fe461def3f4af34d4d
ip = forwarded_ips[0]
CloudFrontRemoteIp.cloudfront_ips.each do |cloudfront_ip|
if cloudfront_ip.include?(ip)
forwarded_ips.shift
break
end
end
end
end
end
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