Merge pull request from GHSA-9pxv-6qvf-pjwc

* Fix timeout handling of outbound HTTP requests

* Use CLOCK_MONOTONIC instead of Time.now

1 files changed, 37 insertions, 0 deletions

diff --git a/app/lib/request.rb b/app/lib/request.rb
index 4bde6fc91..425effa1a 100644
--- a/app/lib/request.rb
+++ b/app/lib/request.rb
@@ -7,11 +7,48 @@ require 'resolv'
 # Monkey-patch the HTTP.rb timeout class to avoid using a timeout block
 # around the Socket#open method, since we use our own timeout blocks inside
 # that method
+#
+# Also changes how the read timeout behaves so that it is cumulative (closer
+# to HTTP::Timeout::Global, but still having distinct timeouts for other
+# operation types)
 class HTTP::Timeout::PerOperation
   def connect(socket_class, host, port, nodelay = false)
     @socket = socket_class.open(host, port)
     @socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1) if nodelay
   end
+
+  # Reset deadline when the connection is re-used for different requests
+  def reset_counter
+    @deadline = nil
+  end
+
+  # Read data from the socket
+  def readpartial(size, buffer = nil)
+    @deadline ||= Process.clock_gettime(Process::CLOCK_MONOTONIC) + @read_timeout
+
+    timeout = false
+    loop do
+      result = @socket.read_nonblock(size, buffer, exception: false)
+
+      return :eof if result.nil?
+
+      remaining_time = @deadline - Process.clock_gettime(Process::CLOCK_MONOTONIC)
+      raise HTTP::TimeoutError, "Read timed out after #{@read_timeout} seconds" if timeout || remaining_time <= 0
+      return result if result != :wait_readable
+
+      # marking the socket for timeout. Why is this not being raised immediately?
+      # it seems there is some race-condition on the network level between calling
+      # #read_nonblock and #wait_readable, in which #read_nonblock signalizes waiting
+      # for reads, and when waiting for x seconds, it returns nil suddenly without completing
+      # the x seconds. In a normal case this would be a timeout on wait/read, but it can
+      # also mean that the socket has been closed by the server. Therefore we "mark" the
+      # socket for timeout and try to read more bytes. If it returns :eof, it's all good, no
+      # timeout. Else, the first timeout was a proper timeout.
+      # This hack has to be done because io/wait#wait_readable doesn't provide a value for when
+      # the socket is closed by the server, and HTTP::Parser doesn't provide the limit for the chunks.
+      timeout = true unless @socket.to_io.wait_readable(remaining_time)
+    end
+  end
 end
 
 class Request