mirror of
https://github.com/basecamp/once-campfire.git
synced 2026-08-28 17:42:50 +09:00
Jeremy Daer
262ac6be06
Web push delivery POSTed to the endpoint URL a user supplied when registering a subscription, with no scheme, host, or private-network check -- unlike the OpenGraph unfurl path, which already routes through the shared SSRF address policy (surfguard). Any authenticated user could register a subscription whose endpoint pointed at an internal address and have the server fetch it on every chat message: blind SSRF for internal recon and reachability probing, plus a thread-pool DoS on the delivery pool. Validate the endpoint when the subscription is saved: it must be HTTPS, its host must belong to a known browser push service (allowlist), and it must resolve to a public IP. On every delivery, re-resolve the host and pin the connection to that public IP so a later DNS rebind can't redirect the request to an internal address. If no public IP resolves at delivery time -- a rebind, or a subscription that predates this validation -- delivery is skipped rather than falling back to re-resolving the raw host. Adds model, controller, and delivery-pinning tests, plus a DNS stub helper for deterministic resolution in tests.
61 lines
2.2 KiB
Ruby
61 lines
2.2 KiB
Ruby
require "test_helper"
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class Users::PushSubscriptionsControllerTest < ActionDispatch::IntegrationTest
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setup do
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sign_in :david
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stub_web_push_dns_resolution
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end
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test "create new push subscription" do
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subscription_params = { "endpoint" => "https://fcm.googleapis.com/fcm/send/abc123", "p256dh_key" => "123", "auth_key" => "456" }
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post user_push_subscriptions_url,
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params: { push_subscription: subscription_params }, headers: { "HTTP_USER_AGENT" => "Mozilla/5.0" }
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assert_response :ok
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assert_equal subscription_params, users(:david).push_subscriptions.last.attributes.slice("endpoint", "p256dh_key", "auth_key")
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assert_equal "Mozilla/5.0", users(:david).push_subscriptions.last.user_agent
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end
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test "touch existing subscription" do
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assert_no_difference -> { users(:david).push_subscriptions.count } do
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assert_changes -> { push_subscriptions(:david_chrome).reload.updated_at } do
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post user_push_subscriptions_url(params: {
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push_subscription: push_subscriptions(:david_chrome).attributes.slice("endpoint", "p256dh_key", "auth_key")
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})
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end
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end
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assert_response :ok
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end
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test "rejects subscription with non-permitted endpoint" do
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subscription_params = { "endpoint" => "https://attacker.example.com/steal", "p256dh_key" => "123", "auth_key" => "456" }
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assert_no_difference -> { Push::Subscription.count } do
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post user_push_subscriptions_url, params: { push_subscription: subscription_params }
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end
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assert_response :unprocessable_entity
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end
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test "rejects subscription with endpoint resolving to a private IP" do
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stub_dns_resolution("169.254.169.254")
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subscription_params = { "endpoint" => "https://fcm.googleapis.com/fcm/send/abc123", "p256dh_key" => "123", "auth_key" => "456" }
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assert_no_difference -> { Push::Subscription.count } do
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post user_push_subscriptions_url, params: { push_subscription: subscription_params }
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end
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assert_response :unprocessable_entity
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end
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test "destroy a push subscription via dev mode" do
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assert_difference -> { Push::Subscription.count }, -1 do
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delete user_push_subscription_url(push_subscriptions(:david_chrome))
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assert_redirected_to user_push_subscriptions_url
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end
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end
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end
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