ModSecurity Handbook: Getting Started - Bad Request

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ModSecurity Handbook by Ivan Ristić Copyright © 2010-2012 Feisty Duck Limited. All rights reserved. ISBN: 978-1-907117-02-2 Development version (12 May 2012). First published in March 2010. Fully revised in April 2012. Feisty Duck Limited www.feistyduck.com contact@feistyduck.com Address: 6 Acantha Court Montpelier Road London W5 2QP United Kingdom Production editor: Jelena Girić-Ristić Copyeditor: Nancy Kotary Cover designer: Peter Jovanović Cover illustration: Maja Veselinović Interior designer: Ivan Ristić Technical reviewer: Brian Rectanus All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission in writing of the publisher. The author and publisher have taken care in preparation of this book, but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information or programs contained herein. ModSecurity is a registered trademark of Trustwave Holdings, Inc. All other trademarks and copyrights are the property of their respective owners.
Table of Contents Preface to the Free Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi Scope and Audience xxi Contents xxii Updates xxv Feedback xxv About the Author xxv About the Technical Reviewer xxvi Acknowledgments xxvi I. User Guide 1 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Brief History of ModSecurity 3 What Can ModSecurity Do? 4 Guiding Principles 7 Deployment Options 7 Is Anything Missing? 8 Getting Started 9 Hybrid Nature of ModSecurity 9 Main Areas of Functionality 10 What Rules Look Like 11 Transaction Lifecycle 11 Impact on Web Server 16 What Next? 17 Resources 18 General Resources 19 Developer Resources 20 AuditConsole 21 Summary 21 2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 iii
Page 1 and 2: MODSECURITY HANDBOOK The Complete G
Page 3: ModSecurity Handbook Ivan Ristić
Page 7 and 8: Advanced Logging Configuration 66 I
Page 9 and 10: Initializing Records 122 Controllin
Page 11 and 12: Rule per Keyword Approach 194 Combi
Page 13 and 14: SecRequestBodyInMemoryLimit 263 Sec
Page 15 and 16: REQUEST_BODY 287 REQUEST_BODY_LENGT
Page 17 and 18: eplaceComments 304 replaceNulls 304
Page 19 and 20: streq 330 validateByteRange 330 val
Page 21 and 22: Preface I didn’t mean to write th
Page 23 and 24: chapter goes under the hood of ModS
Page 25 and 26: open source, you can extend it dire
Page 27 and 28: I User Guide This part, with its 14
Page 29 and 30: eleased in November 2002, but a few
Page 31 and 32: similar restrictions, either direct
Page 33 and 34: Embedded Because ModSecurity is an
Page 35 and 36: Request header transformation Apach
Page 37 and 38: invoke the rules specified to work
Page 39 and 40: what was read. The fourth message t
Page 41 and 42: In the example traces, you’ve obs
Page 43 and 44: Rule writing Rule writing is an ess
Page 45 and 46: minor) version. Before reporting an
Page 47 and 48: 2 Installation Before you can insta
Page 49 and 50: gpg: Signature made Wed 12 Aug 2009
Page 51 and 52: Once you have determined the locati
Page 53 and 54: Compile-Time Options The configurat
Page 55 and 56:
# yum install mod_security On CentO
Page 57 and 58:
3 Configuration Now that you have M
Page 59 and 60:
Audit logs /opt/modsecurity/var/aud
Page 61 and 62:
file, I refer to any other ModSecur
Page 63 and 64:
SecRequestBodyAccess On Once this f
Page 65 and 66:
Note To instruct ModSecurity to ins
Page 67 and 68:
For now, we also assume that you wi
Page 69 and 70:
The SecArgumentSeparator directive
Page 71 and 72:
DA %{MULTIPART_DATA_AFTER}, \ HF %{
Page 73 and 74:
4 Logging This section covers the l
Page 75 and 76:
One way to make debugging easier is
Page 77 and 78:
the use of multiple segments is to
Page 79 and 80:
Concurrent Audit Log Initially, Mod
Page 81 and 82:
How Remote Logging Works Remote log
Page 83 and 84:
Activating Remote Logging You will
Page 85 and 86:
That’s basically all you need to
Page 87 and 88:
Note Storage of intercepted files c
Page 89 and 90:
print "$output\n"; Note If you need
Page 91 and 92:
Dynamically Altering Logging Config
Page 93 and 94:
Now you need to add a phase rule th
Page 95 and 96:
Index A Action part H header, 343 a
Page 97 and 98:
adding new variable, 235 extension
Page 99 and 100:
performance comparing rule sets, 18
Page 101 and 102:
SecChrootDir directive, 252 SecColl
Page 103:
WebApp-Info part H header, 346 web
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ModSecurity Handbook: Getting Started - Bad Request

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