Fixed multipart parameter parsing for when a field's body ends at the same time as a chunk (i.e. we've reached EOL and buffer is empty)

3 files changed, 273 insertions, 4 deletions

diff --git a/lib/rack/utils.rb b/lib/rack/utils.rb
index 606e0cd5..b5aa8a19 100644
--- a/lib/rack/utils.rb
+++ b/lib/rack/utils.rb
@@ -482,9 +482,6 @@ module Rack
               body << buf.slice!(0, i)
               buf.slice!(0, boundary_size+2)
 
-              # If sliced exactly at boundary, let's move:
-              next if buf.empty? && ($1 == EOL)
-
               content_length = -1  if $1 == "--"
             end
 
@@ -515,7 +512,8 @@ module Rack
 
             Utils.normalize_params(params, name, data) unless data.nil?
 
-            break  if buf.empty? || content_length == -1
+            # break if we're at the end of a buffer, but not if it is the end of a field
+            break if (buf.empty? && $1 != EOL) || content_length == -1
           }
 
           input.rewind
diff --git a/test/multipart/bad_robots b/test/multipart/bad_robots
new file mode 100644
index 00000000..7e5bd418
--- /dev/null
+++ b/test/multipart/bad_robots
@@ -0,0 +1,259 @@
+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="bbbbbbbbbbbbbbb"

+

+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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+

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="ccccccc"

+

+ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="file.name"

+

+INPUTMSG.gz

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="file.content_type"

+

+application/octet-stream

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="file.path"

+

+/var/tmp/uploads/4/0001728414

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="file.md5"

+

+aa73198feb4b4c1c3186f5e7466cbbcc

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="file.size"

+

+13212

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="size"

+

+80892

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="mail_server_id"

+

+<1111111111.22222222.3333333333333.JavaMail.app@ffff-aaaa.dddd>
+

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="addresses"

+

+{"campsy_programmer@pinkedum.com":{"domain":"pinkedum.com","name":"Campsy Programmer","type":["env_sender"],"mailbox":"campsy_programmer"},"tex@rapidcity.com":{"domain":"rapidcity.com","name":"Big Tex","type":["env_recipients","to"],"mailbox":"tex"},"group-digests@linkedin.com":{"domain":"linkedin.com","name":"Group Members","type":["from"],"mailbox":"group-digests"}}

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="received_on"

+

+2009-11-15T14:21:11Z

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="id"

+

+dbfd9804d26d11deab24e3037639bf77

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon

+Content-Disposition: form-data; name="ip_address"

+

+127.0.0.1

+--1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon--

diff --git a/test/spec_rack_utils.rb b/test/spec_rack_utils.rb
index 96fb58a0..0a73d18c 100644
--- a/test/spec_rack_utils.rb
+++ b/test/spec_rack_utils.rb
@@ -462,6 +462,18 @@ context "Rack::Utils::Multipart" do
     params["people"][0]["files"][:filename].should.equal "file1.txt"
     params["people"][0]["files"][:tempfile].read.should.equal "contents"
   end
+  
+  specify "can parse fields that end at the end of the buffer" do
+    input = File.read(multipart_file("bad_robots"))
+    
+    req = Rack::Request.new Rack::MockRequest.env_for("/",
+                      "CONTENT_TYPE" => "multipart/form-data, boundary=1yy3laWhgX31qpiHinh67wJXqKalukEUTvqTzmon",
+                      "CONTENT_LENGTH" => input.size,
+                      :input => input)
+
+    req.POST['file.path'].should.equal "/var/tmp/uploads/4/0001728414"
+    req.POST['addresses'].should.not.equal nil
+  end
 
   specify "builds complete params with the chunk size of 16384 slicing exactly on boundary" do
     data = File.open(multipart_file("fail_16384_nofile")) { |f| f.read }.gsub(/\n/, "\r\n")