ModSecurity Handbook: Getting Started - Bad Request

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iv Installation from Source 24 Downloading Releases 24 Downloading from Repository 25 Installation on Unix 27 Installation from Binaries 30 Fedora Core, CentOS, and Red Hat Enterprise Linux 30 Debian and Ubuntu 31 Installation on Windows 31 Summary 32 3. Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Folder Locations 34 Configuration Layout 36 Adding ModSecurity to Apache 37 Powering Up 37 Request Body Handling 38 Response Body Handling 40 Filesystem Locations 42 File Uploads 42 Debug Log 43 Audit Log 44 Miscellaneous Options 44 Default Rule Match Policy 45 Handling Processing Errors 45 Verifying Installation 47 Summary 48 4. Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Debug Log 49 Debugging in Production 50 Audit Log 52 Audit Log Entry Example 53 Concurrent Audit Log 55 Remote Logging 56 Configuring Remote Logging 57 Activating Remote Logging 59 Troubleshooting Remote Logging 60 File Upload Interception 62 Storing Files 62 Inspecting Files 63 Integrating with ClamAV 64
Advanced Logging Configuration 66 Increasing Logging from a Rule 66 Dynamically Altering Logging Configuration 67 Removing Sensitive Data from Audit Logs 67 Selective Audit Logging 68 Summary 69 5. Rule Language Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Anatomy of a Rule 71 Variables 72 Request Variables 73 Server Variables 74 Response Variables 75 Miscellaneous Variables 75 Parsing Flags 76 Collections 77 Time Variables 77 Operators 78 String Matching Operators 78 Numerical Operators 78 Validation Operators 79 Miscellaneous Operators 79 Actions 80 Disruptive Actions 80 Flow Actions 80 Metadata Actions 81 Variable Actions 81 Logging Actions 82 Special Actions 82 Miscellaneous Actions 82 Summary 83 6. Rule Language Tutorial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Introducing Rules 85 Working with Variables 86 Combining Rules into Chains 87 Operator Negation 87 Variable Counting 87 Using Actions 88 Understanding Action Defaults 88 Actions in Chained Rules 90 v
Page 1 and 2: MODSECURITY HANDBOOK The Complete G
Page 3 and 4: ModSecurity Handbook Ivan Ristić
Page 5: Table of Contents Preface to the Fr
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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