discourse/spec/models/screened_ip_address_spec.rb

# frozen_string_literal: true

RSpec.describe ScreenedIpAddress do
  let(:ip_address) { "99.232.23.124" }
  let(:valid_params) { { ip_address: ip_address } }

  describe "new record" do
    it "sets a default action_type" do
      expect(described_class.create(valid_params).action_type).to eq(
        described_class.actions[:block],
      )
    end

    it "sets an error when ip_address is invalid" do
      expect(
        described_class.create(valid_params.merge(ip_address: "99.99.99")).errors[:ip_address],
      ).to be_present
    end

    it "can set action_type using the action_name virtual attribute" do
      expect(described_class.new(valid_params.merge(action_name: :do_nothing)).action_type).to eq(
        described_class.actions[:do_nothing],
      )
      expect(described_class.new(valid_params.merge(action_name: :block)).action_type).to eq(
        described_class.actions[:block],
      )
      expect(described_class.new(valid_params.merge(action_name: "do_nothing")).action_type).to eq(
        described_class.actions[:do_nothing],
      )
      expect(described_class.new(valid_params.merge(action_name: "block")).action_type).to eq(
        described_class.actions[:block],
      )
    end

    it "raises a useful exception when action is invalid" do
      expect { described_class.new(valid_params.merge(action_name: "dance")) }.to raise_error(
        ArgumentError,
      )
    end

    it "raises a useful exception when action is nil" do
      expect { described_class.new(valid_params.merge(action_name: nil)) }.to raise_error(
        ArgumentError,
      )
    end

    it "returns a useful error if ip address matches an existing record" do
      ScreenedIpAddress.create(ip_address: "2600:387:b:f::7a/128", action_name: :block)
      r = ScreenedIpAddress.new(ip_address: "2600:387:b:f::7a", action_name: :block)
      expect(r.save).to eq(false)
      expect(r.errors[:ip_address]).to be_present
    end
  end

  describe "ip_address_with_mask" do
    it "returns nil when ip_address is nil" do
      expect(described_class.new.ip_address_with_mask).to eq(nil)
    end

    it "returns ip_address without mask if there is no mask" do
      expect(described_class.new(ip_address: "123.123.23.22").ip_address_with_mask).to eq(
        "123.123.23.22",
      )
    end

    it "returns ip_address with mask" do
      expect(described_class.new(ip_address: "123.12.0.0/16").ip_address_with_mask).to eq(
        "123.12.0.0/16",
      )
    end
  end

  describe "ip_address=" do
    let(:record) { described_class.new }

    def test_good_value(arg, expected)
      record.ip_address = arg
      expect(record.ip_address_with_mask).to eq(expected)
    end

    def test_bad_value(arg)
      r = described_class.new
      r.ip_address = arg
      expect(r).not_to be_valid
      expect(r.errors[:ip_address]).to be_present
    end

    it "handles valid ip addresses" do
      test_good_value("210.56.12.12", "210.56.12.12")
      test_good_value("210.56.0.0/16", "210.56.0.0/16")
      test_good_value("fc00::/7", "fc00::/7")
      test_good_value(IPAddr.new("94.99.101.228"), "94.99.101.228")
      test_good_value(IPAddr.new("94.99.0.0/16"), "94.99.0.0/16")
      test_good_value(IPAddr.new("fc00::/7"), "fc00::/7")
    end

    it "translates * characters" do
      test_good_value("123.*.*.*", "123.0.0.0/8")
      test_good_value("123.12.*.*", "123.12.0.0/16")
      test_good_value("123.12.1.*", "123.12.1.0/24")
      test_good_value("123.12.*.*/16", "123.12.0.0/16")
      test_good_value("123.12.*", "123.12.0.0/16")
      test_good_value("123.*", "123.0.0.0/8")
    end

    it "handles bad input" do
      test_bad_value(nil)
      test_bad_value("123.123")
      test_bad_value("my house")
      test_bad_value("123.*.1.12")
      test_bad_value("*.123.*.12")
      test_bad_value("*.*.*.12")
      test_bad_value("123.*.1.12/8")
    end
  end

  describe "#watch" do
    context "when ip_address is not being watched" do
      it "should create a new record" do
        record = described_class.watch(ip_address)
        expect(record).not_to be_new_record
        expect(record.action_type).to eq(described_class.actions[:block])
      end

      it "lets action_type be overridden" do
        record =
          described_class.watch(ip_address, action_type: described_class.actions[:do_nothing])
        expect(record).not_to be_new_record
        expect(record.action_type).to eq(described_class.actions[:do_nothing])
      end

      it "a record with subnet mask exists, but doesn't match" do
        existing = Fabricate(:screened_ip_address, ip_address: "99.232.23.124/24")
        expect { described_class.watch("99.232.55.124") }.to change { described_class.count }
      end

      it "a record with exact matching exists, but doesn't match" do
        existing = Fabricate(:screened_ip_address, ip_address: "99.232.23.124")
        expect { described_class.watch("99.232.23.123") }.to change { described_class.count }
      end
    end

    context "when ip_address is already being watched" do
      shared_examples "exact match of ip address" do
        it "should not create a new record" do
          expect { described_class.watch(ip_address_arg) }.to_not change { described_class.count }
        end

        it "returns the existing record" do
          expect(described_class.watch(ip_address_arg)).to eq(existing)
        end
      end

      context "when using exact match" do
        fab!(:existing) { Fabricate(:screened_ip_address) }
        let(:ip_address_arg) { existing.ip_address }
        include_examples "exact match of ip address"
      end

      context "when using subnet mask 255.255.255.0" do
        fab!(:existing) { Fabricate(:screened_ip_address, ip_address: "99.232.23.124/24") }

        context "with exact address" do
          let(:ip_address_arg) { "99.232.23.124" }
          include_examples "exact match of ip address"
        end

        context "with address in same subnet" do
          let(:ip_address_arg) { "99.232.23.135" }
          include_examples "exact match of ip address"
        end
      end
    end

    it "doesn't block 10.0.0.0/8" do
      expect(described_class.watch("10.0.0.0").action_type).to eq(
        described_class.actions[:do_nothing],
      )
      expect(described_class.watch("10.0.0.1").action_type).to eq(
        described_class.actions[:do_nothing],
      )
      expect(described_class.watch("10.10.125.111").action_type).to eq(
        described_class.actions[:do_nothing],
      )
    end

    it "doesn't block 192.168.0.0/16" do
      expect(described_class.watch("192.168.0.5").action_type).to eq(
        described_class.actions[:do_nothing],
      )
      expect(described_class.watch("192.168.10.1").action_type).to eq(
        described_class.actions[:do_nothing],
      )
    end

    it "doesn't block 127.0.0.0/8" do
      expect(described_class.watch("127.0.0.1").action_type).to eq(
        described_class.actions[:do_nothing],
      )
    end

    it "doesn't block fc00::/7 addresses (IPv6)" do
      expect(described_class.watch("fd12:db8::ff00:42:8329").action_type).to eq(
        described_class.actions[:do_nothing],
      )
    end
  end

  describe "#should_block?" do
    it "returns false when record does not exist" do
      expect(described_class.should_block?(ip_address)).to eq(false)
    end

    it "returns false when no record matches" do
      screened_ip_address =
        Fabricate(
          :screened_ip_address,
          ip_address: "111.234.23.11",
          action_type: described_class.actions[:block],
        )
      expect(described_class.should_block?("222.12.12.12")).to eq(false)
      expect(screened_ip_address.reload.match_count).to eq(0)
    end

    it "returns false if a more specific recrord matches and action is :do_nothing" do
      Fabricate(
        :screened_ip_address,
        ip_address: "111.234.23.0/24",
        action_type: described_class.actions[:block],
      )
      Fabricate(
        :screened_ip_address,
        ip_address: "111.234.23.11",
        action_type: described_class.actions[:do_nothing],
      )
      expect(described_class.should_block?("111.234.23.11")).to eq(false)
      expect(described_class.should_block?("111.234.23.12")).to eq(true)

      Fabricate(
        :screened_ip_address,
        ip_address: "222.234.23.0/24",
        action_type: described_class.actions[:do_nothing],
      )
      Fabricate(
        :screened_ip_address,
        ip_address: "222.234.23.11",
        action_type: described_class.actions[:block],
      )
      expect(described_class.should_block?("222.234.23.11")).to eq(true)
      expect(described_class.should_block?("222.234.23.12")).to eq(false)
    end

    context "with IPv4" do
      it "returns false when when record matches and action is :do_nothing" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "111.234.23.11",
            action_type: described_class.actions[:do_nothing],
          )
        expect(described_class.should_block?("111.234.23.11")).to eq(false)
        expect(screened_ip_address.reload.match_count).to eq(0)
      end

      it "returns true when when record matches and action is :block" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "111.234.23.11",
            action_type: described_class.actions[:block],
          )
        expect(described_class.should_block?("111.234.23.11")).to eq(true)
        expect(screened_ip_address.reload.match_count).to eq(1)
      end
    end

    context "with IPv6" do
      it "returns false when when record matches and action is :do_nothing" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "2001:db8::ff00:42:8329",
            action_type: described_class.actions[:do_nothing],
          )
        expect(described_class.should_block?("2001:db8::ff00:42:8329")).to eq(false)
        expect(screened_ip_address.reload.match_count).to eq(0)
      end

      it "returns true when when record matches and action is :block" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "2001:db8::ff00:42:8329",
            action_type: described_class.actions[:block],
          )
        expect(described_class.should_block?("2001:db8::ff00:42:8329")).to eq(true)
        expect(screened_ip_address.reload.match_count).to eq(1)
      end
    end
  end

  describe "#is_allowed?" do
    it "returns false when record does not exist" do
      expect(described_class.is_allowed?(ip_address)).to eq(false)
    end

    it "returns false when no record matches" do
      screened_ip_address =
        Fabricate(
          :screened_ip_address,
          ip_address: "111.234.23.11",
          action_type: described_class.actions[:do_nothing],
        )
      expect(described_class.is_allowed?("222.12.12.12")).to eq(false)
      expect(screened_ip_address.reload.match_count).to eq(0)
    end

    context "with IPv4" do
      it "returns true when when record matches and action is :do_nothing" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "111.234.23.11",
            action_type: described_class.actions[:do_nothing],
          )
        expect(described_class.is_allowed?("111.234.23.11")).to eq(true)
        expect(screened_ip_address.reload.match_count).to eq(1)
      end

      it "returns false when when record matches and action is :block" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "111.234.23.11",
            action_type: described_class.actions[:block],
          )
        expect(described_class.is_allowed?("111.234.23.11")).to eq(false)
        expect(screened_ip_address.reload.match_count).to eq(0)
      end
    end

    context "with IPv6" do
      it "returns true when when record matches and action is :do_nothing" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "2001:db8::ff00:42:8329",
            action_type: described_class.actions[:do_nothing],
          )
        expect(described_class.is_allowed?("2001:db8::ff00:42:8329")).to eq(true)
        expect(screened_ip_address.reload.match_count).to eq(1)
      end

      it "returns false when when record matches and action is :block" do
        screened_ip_address =
          Fabricate(
            :screened_ip_address,
            ip_address: "2001:db8::ff00:42:8329",
            action_type: described_class.actions[:block],
          )
        expect(described_class.is_allowed?("2001:db8::ff00:42:8329")).to eq(false)
        expect(screened_ip_address.reload.match_count).to eq(0)
      end
    end
  end

  describe "#block_admin_login?" do
    context "when no allow_admin records exist" do
      it "returns false when use_admin_ip_allowlist is false" do
        expect(described_class.block_admin_login?(Fabricate.build(:user), "123.12.12.12")).to eq(
          false,
        )
      end

      context "when use_admin_ip_allowlist is true" do
        before { SiteSetting.use_admin_ip_allowlist = true }

        it "returns false when user is nil" do
          expect(described_class.block_admin_login?(nil, "123.12.12.12")).to eq(false)
        end

        it "returns false for non-admin user" do
          expect(described_class.block_admin_login?(Fabricate.build(:user), "123.12.12.12")).to eq(
            false,
          )
        end

        it "returns false for admin user" do
          expect(described_class.block_admin_login?(Fabricate.build(:admin), "123.12.12.12")).to eq(
            false,
          )
        end

        it "returns false for admin user and ip_address arg is nil" do
          expect(described_class.block_admin_login?(Fabricate.build(:admin), nil)).to eq(false)
        end
      end
    end

    context "when allow_admin record exists" do
      before do
        @permitted_ip_address = "111.234.23.11"
        Fabricate(
          :screened_ip_address,
          ip_address: @permitted_ip_address,
          action_type: described_class.actions[:allow_admin],
        )
      end

      it "returns false when use_admin_ip_allowlist is false" do
        expect(described_class.block_admin_login?(Fabricate.build(:admin), "123.12.12.12")).to eq(
          false,
        )
      end

      context "when use_admin_ip_allowlist is true" do
        before { SiteSetting.use_admin_ip_allowlist = true }

        it "returns false when user is nil" do
          expect(described_class.block_admin_login?(nil, @permitted_ip_address)).to eq(false)
        end

        it "returns false for an admin user at the allowed ip address" do
          expect(
            described_class.block_admin_login?(Fabricate.build(:admin), @permitted_ip_address),
          ).to eq(false)
        end

        it "returns true for an admin user at another ip address" do
          expect(described_class.block_admin_login?(Fabricate.build(:admin), "123.12.12.12")).to eq(
            true,
          )
        end

        it "returns false for regular user at allowed ip address" do
          expect(
            described_class.block_admin_login?(Fabricate.build(:user), @permitted_ip_address),
          ).to eq(false)
        end

        it "returns false for regular user at another ip address" do
          expect(described_class.block_admin_login?(Fabricate.build(:user), "123.12.12.12")).to eq(
            false,
          )
        end
      end
    end
  end

  describe "#roll_up" do
    it "rolls up IPv4 addresses" do
      SiteSetting.min_ban_entries_for_roll_up = 3

      # this should not be touched
      Fabricate(:screened_ip_address, ip_address: "1.1.1.254/31")

      Fabricate(:screened_ip_address, ip_address: "1.1.1.1")
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "1.1.1.2")
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "1.1.1.3")
      expect { ScreenedIpAddress.roll_up }.to change { ScreenedIpAddress.count }.by(-2)
      expect(ScreenedIpAddress.pluck(:ip_address)).to include("1.1.1.0/24", "1.1.1.254/31")
      expect(ScreenedIpAddress.pluck(:ip_address)).not_to include("1.1.1.1", "1.1.1.2", "1.1.1.3")

      # expect roll up to be stable
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }
    end

    it "rolls up IPv6 addresses" do
      SiteSetting.min_ban_entries_for_roll_up = 3

      Fabricate(:screened_ip_address, ip_address: "2001:db8:3333:4441:5555:6666:7777:8888")
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "2001:db8:3333:4441:5555:6666:7777:8889")
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "2001:db8:3333:4441:5555:6666:7777:888a/96")
      expect { ScreenedIpAddress.roll_up }.to change { ScreenedIpAddress.count }.by(-2)
      expect(ScreenedIpAddress.pluck(:ip_address)).to include("2001:db8:3333:4441::/64")
      expect(ScreenedIpAddress.pluck(:ip_address)).not_to include(
        "2001:db8:3333:4441:5555:6666:7777:8888",
        "2001:db8:3333:4441:5555:6666:7777:8889",
        "2001:db8:3333:4441:5555:6666:7777:888a",
      )

      # expect roll up to be stable
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "2001:db8:3333:4442::/64")
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }

      Fabricate(:screened_ip_address, ip_address: "2001:db8:3333:4443::/64")
      expect { ScreenedIpAddress.roll_up }.to change { ScreenedIpAddress.count }.by(-2)
      expect(ScreenedIpAddress.pluck(:ip_address)).to include("2001:db8:3333:4440::/60")
      expect(ScreenedIpAddress.pluck(:ip_address)).not_to include(
        "2001:db8:3333:4441::/64",
        "2001:db8:3333:4442::/64",
        "2001:db8:3333:4443::/64",
      )

      # expect roll up to be stable
      expect { ScreenedIpAddress.roll_up }.not_to change { ScreenedIpAddress.count }
    end
  end
end