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188 lines
6 KiB
Ruby
188 lines
6 KiB
Ruby
require_dependency 'screening_model'
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require_dependency '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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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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# 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.to_s}' <<= ip_address")
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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 and b.action_type == action_type)
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b.record_match! if found and 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')) 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')) 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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ScreenedIpAddress.exec_sql(star_subnets_query, min_count: min_count).values.flatten
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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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ScreenedIpAddress.exec_sql(star_star_subnets_query, min_count: 10, roll_up_weight: weight).values.flatten
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end
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def self.roll_up(current_user=Discourse.system_user)
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# 1 - retrieve all subnets that needs roll up
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subnets = [star_subnets, star_star_subnets].flatten
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# 2 - log the call
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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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# 3 - create subnet if not already exists
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ScreenedIpAddress.new(ip_address: subnet).save unless ScreenedIpAddress.where(ip_address: subnet).exists?
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# 4 - update stats
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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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ScreenedIpAddress.exec_sql(sql, ip_address: subnet)
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# 5 - remove old matches
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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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# return the subnets
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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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