Add LimitRequestFields parameter in main configuration #1742

geekix · 2017-12-19T09:26:14Z

Hello,

I need to configure this parameter : LimitRequestFields (http://httpd.apache.org/docs/current/mod/core.html#limitrequestfields) but it is not managed by your module yet.

So I took the liberty to add this parameter in the init.pp file (with a value at '100', which is the default value in apache) and in the httpd.conf template.

Successfully tested on Debian 8.9 and apache 2.4.10.

Thanks

geekix · 2017-12-19T14:19:03Z

I took a look at the logs but I don't get why the travis tests fail.

david22swan · 2017-12-20T15:18:10Z

Please add docs to reflect your changes and tests to insure that it works correctly. Also the test fail is unrelated to your code and part of a separate problem.

geekix · 2017-12-21T07:41:24Z

Hello,

What kind of test do you need?

david22swan · 2017-12-21T09:28:22Z

Just a simple test that covers it's usage. One that utilises your change and then confirms that it worked as it should.

geekix · 2017-12-21T15:04:04Z

Hello,

I configure my apache server with the following value :

user@server ~ :) # grep LimitRequestFields /etc/apache2/apache2.conf
LimitRequestFields 4

This means that the server will only accept a maximum of 4 headers per HTTP request. Then I used apache benchmark to send HTTP requests, here is the result with only one header :

user@server ~ :) #  ab -n1 -c1 -H "header1:test" -v 2 http://127.0.0.1/
This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)...INFO: GET header ==
---
GET / HTTP/1.0
header1:test
Host: 127.0.0.1
User-Agent: ApacheBench/2.3
Accept: */*


---
LOG: header received:
HTTP/1.1 200 OK
Date: Thu, 21 Dec 2017 14:44:51 GMT
Server: Apache
Last-Modified: Mon, 04 Dec 2017 10:42:20 GMT
Accept-Ranges: bytes
Content-Length: 589
Vary: Accept-Encoding
Connection: close
Content-Type: text/html

<!doctype html>
<html lang="fr">
<head>
  <meta charset="utf-8">
  <title>It works</title>
</head>
<body>
It works !
</body>
</html>


..done


Server Software:        Apache
Server Hostname:        127.0.0.1
Server Port:            80

Document Path:          /
Document Length:        589 bytes

Concurrency Level:      1
Time taken for tests:   0.001 seconds
Complete requests:      1
Failed requests:        0
Total transferred:      817 bytes
HTML transferred:       589 bytes
Requests per second:    1040.58 [#/sec] (mean)
Time per request:       0.961 [ms] (mean)
Time per request:       0.961 [ms] (mean, across all concurrent requests)
Transfer rate:          830.23 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:     1    1   0.0      1       1
Waiting:        0    0   0.0      0       0
Total:          1    1   0.0      1       1

Then an other request with 5 headers. As you can see, the request returns a 400 HTTP error (HTTP/1.1 400 Bad Request) with this error message : The number of request header fields exceeds this server's limit

user@server ~ :) #  ab -n1 -c1 -H "header1:test" -H "header2:test" -H "header3:test" -H "header4:test" -H "header5:test" -v 2 http://127.0.0.1/
This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)...INFO: GET header ==
---
GET / HTTP/1.0
header1:test
header2:test
header3:test
header4:test
header5:test
Host: 127.0.0.1
User-Agent: ApacheBench/2.3
Accept: */*


---
LOG: header received:
HTTP/1.1 400 Bad Request
Date: Thu, 21 Dec 2017 14:44:01 GMT
Server: Apache
Content-Length: 290
Connection: close
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
The number of request header fields exceeds this server's limit.</p>
</body></html>

WARNING: Response code not 2xx (400)
..done


Server Software:        Apache
Server Hostname:        127.0.0.1
Server Port:            80

Document Path:          /
Document Length:        290 bytes

Concurrency Level:      1
Time taken for tests:   0.001 seconds
Complete requests:      1
Failed requests:        0
Non-2xx responses:      1
Total transferred:      456 bytes
HTML transferred:       290 bytes
Requests per second:    1207.73 [#/sec] (mean)
Time per request:       0.828 [ms] (mean)
Time per request:       0.828 [ms] (mean, across all concurrent requests)
Transfer rate:          537.82 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:     1    1   0.0      1       1
Waiting:        0    0   0.0      0       0
Total:          1    1   0.0      1       1

geekix · 2017-12-22T08:00:56Z

As for the module itself, here is what I configured in my hiera file :

apache::limitreqfields: '120'

And the result on the node :

Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Info: Caching catalog for [email protected]
Info: Applying configuration version '208a3f3b10466ed298e9addcdd82162ca2074f5e'
Notice: /Stage[main]/Apache/File[/etc/apache2/apache2.conf]/content:
--- /etc/apache2/apache2.conf   2017-12-22 08:58:48.789589106 +0100
+++ /tmp/puppet-file20171222-35390-dntnjy       2017-12-22 08:59:02.000000000 +0100
@@ -11,7 +11,7 @@
 MaxKeepAliveRequests 100
 KeepAliveTimeout 15
 LimitRequestFieldSize 8190
-LimitRequestFields 4
+LimitRequestFields 120

Notice: /Stage[main]/Apache/File[/etc/apache2/apache2.conf]/content: content changed '{md5}c675a39664137d77257c44da1352c961' to '{md5}029ecf57552a49875bb054554a02a4c1'
Info: /Stage[main]/Apache/File[/etc/apache2/apache2.conf]: Scheduling refresh of Class[Apache::Service]
Info: Class[Apache::Service]: Scheduling refresh of Service[httpd]
Notice: /Stage[main]/Apache::Service/Service[httpd]: Triggered 'refresh' from 1 events```

geekix · 2018-01-02T08:42:09Z

Hi there,

Happy new year ^^

Do I need to provide more informations on this subject? Are there still unclear points?

Thanks

david22swan · 2018-01-02T09:18:07Z

@geekix Still needs tests to be implemented, simply add one where you set a limit and then test to ensure that you can't go over it.

geekix · 2018-01-02T09:33:13Z

Hello,

If you go over my last comments, you will find a test that shows that the limit works. Please tell me if you need more explanations.

david22swan · 2018-01-02T10:09:42Z

@geekix I feel that you misunderstand, When I say tests I mean automated ones that are built into the module.

geekix · 2018-01-02T10:18:11Z

@david22swan I'm sorry, I don't know about automated tests. Can you please give me a hint?

Thanks

david22swan · 2018-01-02T12:51:06Z

@geekix You should take a look at this test file:

https://github.com/puppetlabs/puppetlabs-apache/blob/master/spec/acceptance/apache_parameters_spec.rb

Look at line 388 to 400, it's the test for 'limitreqfieldsize'.
Try to copy what it does.

geekix · 2018-01-02T13:00:36Z

I'll take a look, thanks for the advice

geekix · 2018-01-02T13:42:52Z

I have added a test in the file apache_parameters_spec.rb. I hope it's what you expect.

Add LimitRequestFields parameter in main configuration

Damien ELLUL added 2 commits December 19, 2017 08:26

manifest/init.pp: add limitreqfields default param

31cdb8e

templates/httpd.conf.erb: add limitreqfields param

cace155

README.md: Add documentation for limitreqfieldsize parameter

3381368

david22swan added needs-docs needs-tests labels Dec 20, 2017

Damien ELLUL added 4 commits December 20, 2017 16:18

README.md: Add documentation for limitreqfields parameter

6164b1d

Merge branch 'master' of https://github.com/geekix/puppetlabs-apache

2803ea0

README.md: correct limitreqfieldsize => limitreqfields

9a7d27e

README.md: correct documentation link syntax for limitreqfields

0edd804

david22swan removed the needs-docs label Dec 20, 2017

Add acceptance test for param LimitRequestFields

6835a1d

david22swan removed the needs-tests label Jan 3, 2018

david22swan merged commit 6f8d5a5 into puppetlabs:master Jan 3, 2018

cegeka-jenkins pushed a commit to cegeka/puppet-apache that referenced this pull request Jul 15, 2020

Merge pull request puppetlabs#1742 from geekix/master

e322dcc

Add LimitRequestFields parameter in main configuration

GSPatton added the feature label Jun 13, 2023

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Add LimitRequestFields parameter in main configuration #1742

Add LimitRequestFields parameter in main configuration #1742

geekix commented Dec 19, 2017

geekix commented Dec 19, 2017

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Add LimitRequestFields parameter in main configuration #1742

Add LimitRequestFields parameter in main configuration #1742

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geekix commented Dec 19, 2017

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