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427d54b2b0
Zeitwerk simplifies working with dependencies in dev and makes it easier reloading class chains. We no longer need to use Rails "require_dependency" anywhere and instead can just use standard Ruby patterns to require files. This is a far reaching change and we expect some followups here.
195 lines
6.0 KiB
Ruby
195 lines
6.0 KiB
Ruby
# frozen_string_literal: true
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require 'screening_model'
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require 'ip_addr'
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# A ScreenedIpAddress record represents an IP address or subnet that is being watched,
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# and possibly blocked from creating accounts.
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class ScreenedIpAddress < ActiveRecord::Base
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include ScreeningModel
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default_action :block
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validates :ip_address, ip_address_format: true, presence: true
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after_validation :check_for_match
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def self.watch(ip_address, opts = {})
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match_for_ip_address(ip_address) || create(opts.slice(:action_type).merge(ip_address: ip_address))
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end
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def check_for_match
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unless self.errors[:ip_address].present?
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matched = self.class.match_for_ip_address(self.ip_address)
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if matched && matched.action_type == self.action_type
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self.errors.add(:ip_address, :ip_address_already_screened)
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end
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end
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end
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# In Rails 4.0.0, validators are run to handle invalid assignments to inet columns (as they should).
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# In Rails 4.0.1, an exception is raised before validation happens, so we need this hack for
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# inet/cidr columns:
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def ip_address=(val)
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if val.nil?
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self.errors.add(:ip_address, :invalid)
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return
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end
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if val.is_a?(IPAddr)
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write_attribute(:ip_address, val)
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return
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end
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v = IPAddr.handle_wildcards(val)
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if v.nil?
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self.errors.add(:ip_address, :invalid)
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return
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end
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write_attribute(:ip_address, v)
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# this gets even messier, Ruby 1.9.2 raised a different exception to Ruby 2.0.0
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# handle both exceptions
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rescue ArgumentError, IPAddr::InvalidAddressError
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self.errors.add(:ip_address, :invalid)
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end
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# Return a string with the ip address and mask in standard format. e.g., "127.0.0.0/8".
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def ip_address_with_mask
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ip_address.try(:to_cidr_s)
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end
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def self.match_for_ip_address(ip_address)
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# The <<= operator on inet columns means "is contained within or equal to".
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#
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# Read more about PostgreSQL's inet data type here:
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#
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# http://www.postgresql.org/docs/9.1/static/datatype-net-types.html
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# http://www.postgresql.org/docs/9.1/static/functions-net.html
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find_by("? <<= ip_address", ip_address.to_s)
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end
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def self.should_block?(ip_address)
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exists_for_ip_address_and_action?(ip_address, actions[:block])
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end
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def self.is_whitelisted?(ip_address)
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exists_for_ip_address_and_action?(ip_address, actions[:do_nothing])
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end
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def self.exists_for_ip_address_and_action?(ip_address, action_type, opts = {})
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b = match_for_ip_address(ip_address)
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found = (!!b && b.action_type == (action_type))
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b.record_match! if found && opts[:record_match] != (false)
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found
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end
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def self.block_admin_login?(user, ip_address)
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return false unless SiteSetting.use_admin_ip_whitelist
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return false if user.nil?
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return false if !user.admin?
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return false if ScreenedIpAddress.where(action_type: actions[:allow_admin]).count == 0
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return true if ip_address.nil?
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!exists_for_ip_address_and_action?(ip_address, actions[:allow_admin], record_match: false)
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end
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def self.star_subnets_query
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@star_subnets_query ||= <<~SQL
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SELECT network(inet(host(ip_address) || '/24'))::text AS ip_range
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FROM screened_ip_addresses
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WHERE action_type = #{ScreenedIpAddress.actions[:block]}
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AND family(ip_address) = 4
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AND masklen(ip_address) = 32
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GROUP BY ip_range
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HAVING COUNT(*) >= :min_count
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SQL
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end
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def self.star_star_subnets_query
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@star_star_subnets_query ||= <<~SQL
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WITH weighted_subnets AS (
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SELECT network(inet(host(ip_address) || '/16'))::text AS ip_range,
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CASE masklen(ip_address)
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WHEN 32 THEN 1
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WHEN 24 THEN :roll_up_weight
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ELSE 0
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END AS weight
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FROM screened_ip_addresses
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WHERE action_type = #{ScreenedIpAddress.actions[:block]}
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AND family(ip_address) = 4
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)
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SELECT ip_range
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FROM weighted_subnets
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GROUP BY ip_range
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HAVING SUM(weight) >= :min_count
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SQL
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end
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def self.star_subnets
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min_count = SiteSetting.min_ban_entries_for_roll_up
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DB.query_single(star_subnets_query, min_count: min_count)
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end
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def self.star_star_subnets
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weight = SiteSetting.min_ban_entries_for_roll_up
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DB.query_single(star_star_subnets_query, min_count: 10, roll_up_weight: weight)
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end
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def self.roll_up(current_user = Discourse.system_user)
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subnets = [star_subnets, star_star_subnets].flatten
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StaffActionLogger.new(current_user).log_roll_up(subnets) unless subnets.blank?
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subnets.each do |subnet|
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ScreenedIpAddress.create(ip_address: subnet) unless ScreenedIpAddress.where("? <<= ip_address", subnet).exists?
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sql = <<~SQL
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UPDATE screened_ip_addresses
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SET match_count = sum_match_count
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, created_at = min_created_at
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, last_match_at = max_last_match_at
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FROM (
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SELECT SUM(match_count) AS sum_match_count
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, MIN(created_at) AS min_created_at
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, MAX(last_match_at) AS max_last_match_at
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FROM screened_ip_addresses
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WHERE action_type = #{ScreenedIpAddress.actions[:block]}
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AND family(ip_address) = 4
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AND ip_address << :ip_address
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) s
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WHERE ip_address = :ip_address
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SQL
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DB.exec(sql, ip_address: subnet)
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ScreenedIpAddress.where(action_type: ScreenedIpAddress.actions[:block])
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.where("family(ip_address) = 4")
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.where("ip_address << ?", subnet)
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.delete_all
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end
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subnets
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end
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end
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# == Schema Information
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#
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# Table name: screened_ip_addresses
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#
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# id :integer not null, primary key
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# ip_address :inet not null
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# action_type :integer not null
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# match_count :integer default(0), not null
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# last_match_at :datetime
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# created_at :datetime not null
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# updated_at :datetime not null
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#
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# Indexes
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#
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# index_screened_ip_addresses_on_ip_address (ip_address) UNIQUE
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# index_screened_ip_addresses_on_last_match_at (last_match_at)
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#
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