Module: Arachni::Check::Auditor

Included in:
Base
Defined in:
lib/arachni/check/auditor.rb

Overview

Included by Base and provides helper audit methods to all checks.

There are 3 main types of audit and analysis techniques available:

It should be noted that actual analysis takes place at the element level, and to be more specific, the Element::Capabilities::Auditable element level.

It also provides:

Author:

Constant Summary collapse

Format =

Holds constant bitfields that describe the preferred formatting of injection strings.

Element::Capabilities::Mutable::Format
OPTIONS =

Default audit options.

{

    # Elements to audit.
    #
    # If no elements have been passed to audit methods, candidates will be
    # determined by {#each_candidate_element}.
    elements:     [Element::Link, Element::Form,
                    Element::Cookie, Element::Header,
                    Element::Body, Element::LinkTemplate],

    dom_elements: [Element::Link::DOM, Element::Form::DOM,
                   Element::Cookie::DOM, Element::LinkTemplate::DOM],

    # If set to `true` the HTTP response will be analyzed for new elements.
    # Be careful when enabling it, there'll be a performance penalty.
    #
    # If set to `false`, no training is going to occur.
    #
    # If set to `nil`, when the Auditor submits a form with original or
    # sample values this option will be overridden to `true`
    train:        nil
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#framework ⇒ Arachni::Framework (readonly) 



196
197
198
 
# File 'lib/arachni/check/auditor.rb', line 196

def framework
  @framework
end

#page ⇒ Arachni::Page (readonly) 



193
194
195
 
# File 'lib/arachni/check/auditor.rb', line 193

def page
  @page
end

Class Method Details

.has_timeout_candidates? ⇒ Boolean 



45
46
47
 
# File 'lib/arachni/check/auditor.rb', line 45

def self.has_timeout_candidates?
    Element::Capabilities::Analyzable.has_timeout_candidates?
end

.included(m) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'lib/arachni/check/auditor.rb', line 71

def self.included( m )
    m.class_eval do

        # Determines whether or not to run the check against the given page
        # depending on which elements exist in the page, which elements the
        # check is configured to audit and user options.
        #
        # @param    [Page]    page
        #
        # @return   [Bool]
        def self.check?( page )
            return false if issue_limit_reached?
            return true  if elements.empty?

            audit = Arachni::Options.audit

            {
                # We use procs to make the decision, to avoid loading the page
                # element caches unless it's absolutely necessary.
                Element::Link              =>
                    proc { audit.links?     && !!page.links.find { |e| e.inputs.any? } },
                Element::Link::DOM         =>
                    proc { audit.link_doms? && !!page.links.find(&:dom) },
                Element::Form              =>
                    proc { audit.forms? && !!page.forms.find { |e| e.inputs.any? } },
                Element::Form::DOM         =>
                    proc { audit.form_doms? && page.has_script? && !!page.forms.find(&:dom) },
                Element::Cookie            =>
                    proc { audit.cookies? && page.cookies.any? },
                Element::Cookie::DOM       =>
                    proc { audit.cookie_doms? && page.has_script? && page.cookies.any? },
                Element::Header            =>
                    proc { audit.headers? && page.headers.any? },
                Element::LinkTemplate      =>
                    proc { audit.link_templates? && page.link_templates.find { |e| e.inputs.any? } },
                Element::LinkTemplate::DOM =>
                    proc { audit.link_template_doms? && !!page.link_templates.find(&:dom) },
                Element::Body              => !page.body.empty?,
                Element::GenericDOM        => page.has_script?,
                Element::Path              => true,
                Element::Server            => true
            }.each do |type, decider|
                return true if elements.include?( type ) &&
                    (decider.is_a?( Proc ) ? decider.call : decider)
            end

            false
        end

        def self.issue_counter
            @issue_counter ||= 0
        end

        def self.issue_counter=( int )
            @issue_counter = int
        end

        def increment_issue_counter
            self.class.issue_counter += 1
        end

        def issue_limit_reached?( count = max_issues )
            self.class.issue_limit_reached?( count )
        end

        def self.issue_limit_reached?( count = max_issues )
            issue_counter >= count if !count.nil?
        end

        def self.max_issues
            info[:max_issues]
        end

        # Helper method for creating an issue.
        #
        # @param    [Hash]  options
        #   {Issue} options.
        def self.create_issue( options )
            check_info = self.info.dup
            check_info.delete( :issue )
            check_info[:shortname] = self.shortname

            issue_data = self.info[:issue].merge( check: check_info ).merge( options )
            Issue.new( issue_data )
        end
    end
end

.reset ⇒ Object 



41
42
43
 
# File 'lib/arachni/check/auditor.rb', line 41

def self.reset
    audited.clear
end

.timeout_audit_run ⇒ Object 



48
49
50
 
# File 'lib/arachni/check/auditor.rb', line 48

def self.timeout_audit_run
    Element::Capabilities::Analyzable.timeout_audit_run
end

Instance Method Details

#audit(payloads, opts = {}, &block) ⇒ Object

If a block has been provided it calls Element::Capabilities::Auditable#audit for every element, otherwise, it defaults to #audit_taint.

Uses #each_candidate_element to decide which elements to audit.

See Also:



505
506
507
508
509
510
511
512
513
514
515
 
# File 'lib/arachni/check/auditor.rb', line 505

def audit( payloads, opts = {}, &block )
    opts = OPTIONS.merge( opts )
    if !block_given?
        audit_taint( payloads, opts )
    else
        each_candidate_element( opts[:elements] ) do |e|
            e.audit( payloads, opts, &block )
            audited( e.coverage_id )
        end
    end
end

#audit_differential(opts = {}, &block) ⇒ Object

Audits elements using differential analysis and automatically logs results.

Uses #each_candidate_element to decide which elements to audit.

See Also:



538
539
540
541
542
543
544
 
# File 'lib/arachni/check/auditor.rb', line 538

def audit_differential( opts = {}, &block )
    opts = OPTIONS.merge( opts )
    each_candidate_element( opts[:elements] ) do |e|
        e.differential_analysis( opts, &block )
        audited( e.coverage_id )
    end
end

#audit_taint(payloads, opts = {}) ⇒ Object

Provides easy access to element auditing using simple taint analysis and automatically logs results.

Uses #each_candidate_element to decide which elements to audit.

See Also:



524
525
526
527
528
529
530
 
# File 'lib/arachni/check/auditor.rb', line 524

def audit_taint( payloads, opts = {} )
    opts = OPTIONS.merge( opts )
    each_candidate_element( opts[:elements] )do |e|
        e.taint_analysis( payloads, opts )
        audited( e.coverage_id )
    end
end

#audit_timeout(payloads, opts = {}) ⇒ Object

Audits elements using timing attacks and automatically logs results.

Uses #each_candidate_element to decide which elements to audit.

See Also:



552
553
554
555
556
557
558
 
# File 'lib/arachni/check/auditor.rb', line 552

def audit_timeout( payloads, opts = {} )
    opts = OPTIONS.merge( opts )
    each_candidate_element( opts[:elements] ) do |e|
        e.timeout_analysis( payloads, opts )
        audited( e.coverage_id )
    end
end

#audited(id) ⇒ Object

See Also:



56
57
58
 
# File 'lib/arachni/check/auditor.rb', line 56

def audited( id )
    Auditor.audited << "#{self.class}-#{id}"
end

#audited?(id) ⇒ Bool

Returns ‘true` if audited, `false` otherwise.

See Also:



67
68
69
 
# File 'lib/arachni/check/auditor.rb', line 67

def audited?( id )
    Auditor.audited.include?( "#{self.class}-#{id}" )
end

#each_candidate_dom_element(types = []) {|element| ... } ⇒ Object

Passes each element prepared for audit to the block.

If no element types have been specified in ‘opts`, it will use the elements from the check’s Base.info hash.

If no elements have been specified in ‘opts` or Base.info, it will use the elements in OPTIONS.

Yields:

  • (element) —

    Each candidate element.

Yield Parameters:



469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
 
# File 'lib/arachni/check/auditor.rb', line 469

def each_candidate_dom_element( types = [], &block )
    types = self.class.info[:elements]    if types.empty?
    types = OPTIONS[:dom_elements]        if types.empty?

    types.each do |elem|
        elem = elem.type

        next if !Options.audit.elements?( elem.to_s.gsub( '_dom', '' ) )

        case elem
            when Element::Link::DOM.type
                prepare_each_dom_element( page.links, &block )

            when Element::Form::DOM.type
                prepare_each_dom_element( page.forms, &block )

            when Element::Cookie::DOM.type
                prepare_each_dom_element( page.cookies, &block )

            when Element::LinkTemplate::DOM.type
                prepare_each_dom_element( page.link_templates, &block )

            else
                fail ArgumentError, "Unknown DOM element: #{elem}"
        end
    end
end

#each_candidate_element(types = []) {|element| ... } ⇒ Object

Passes each element prepared for audit to the block.

If no element types have been specified in ‘opts`, it will use the elements from the check’s Base.info hash.

If no elements have been specified in ‘opts` or Base.info, it will use the elements in OPTIONS.

Yields:

  • (element) —

    Each candidate element.

Yield Parameters:



423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
 
# File 'lib/arachni/check/auditor.rb', line 423

def each_candidate_element( types = [], &block )
    types = self.class.info[:elements] if types.empty?
    types = OPTIONS[:elements]         if types.empty?

    types.each do |elem|
        elem = elem.type

        next if elem == Element::Body.type
        next if !Options.audit.elements?( elem )

        case elem
            when Element::Link.type
                prepare_each_element( page.links, &block )

            when Element::Form.type
                prepare_each_element( page.forms, &block )

            when Element::Cookie.type
                prepare_each_element(page.cookies, &block )

            when Element::Header.type
                prepare_each_element( page.headers, &block )

            when Element::LinkTemplate.type
                prepare_each_element( page.link_templates, &block )

            else
                fail ArgumentError, "Unknown element: #{elem}"
        end
    end
end

#http ⇒ HTTP::Client 



206
207
208
 
# File 'lib/arachni/check/auditor.rb', line 206

def http
    HTTP::Client
end

#initialize(page, framework) ⇒ Object 



200
201
202
203
 
# File 'lib/arachni/check/auditor.rb', line 200

def initialize( page, framework )
    @page      = page
    @framework = framework
end

#log(options) ⇒ Issue

Populates and logs an Issue.



254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
 
# File 'lib/arachni/check/auditor.rb', line 254

def log( options )
    options       = options.dup
    vector        = options[:vector]
    audit_options = vector.respond_to?( :audit_options ) ?
        vector.audit_options : {}

    if options[:response]
        page = options.delete(:response).to_page
    elsif options[:page]
        page = options.delete(:page)
    else
        page = self.page
    end

    msg = "In #{vector.type}"

    active = vector.respond_to?( :affected_input_name ) && vector.affected_input_name

    if active
        msg << " input '#{vector.affected_input_name}'"
    elsif vector.respond_to?( :inputs )
        msg << " with inputs '#{vector.inputs.keys.join(', ')}'"
    end

    print_ok "#{msg} with action #{vector.action}"

    if verbose?
        if active
            print_verbose "Injected:  #{vector.affected_input_value.inspect}"
        end

        if options[:signature]
            print_verbose "Signature: #{options[:signature]}"
        end

        if options[:proof]
            print_verbose "Proof:     #{options[:proof]}"
        end

        if page.dom.transitions.any?
            print_verbose 'DOM transitions:'
            page.dom.print_transitions( method(:print_verbose), '    ' )
        end

        if !(request_dump = page.request.to_s).empty?
            print_verbose "Request: \n#{request_dump}"
        end

        print_verbose( '---------' ) if only_positives?
    end

    # Platform identification by vulnerability.
    platform_type = nil
    if (platform = (options.delete(:platform) || audit_options[:platform]))
        Platform::Manager[vector.action] << platform if Options.fingerprint?
        platform_type = Platform::Manager[vector.action].find_type( platform )
    end

    log_issue(options.merge(
        platform_name: platform,
        platform_type: platform_type,
        page:          page
    ))
end

#log_issue(options) ⇒ Issue

Helper method for issue logging.

See Also:

  • create_issue


355
356
357
358
359
360
361
362
 
# File 'lib/arachni/check/auditor.rb', line 355

def log_issue( options )
    return if issue_limit_reached?
    self.class.issue_counter += 1

    issue = self.class.create_issue( options.merge( referring_page: self.page ) )
    Data.issues << issue
    issue
end

#log_remote_file(response, silent = false) ⇒ Object #log_remote_file(page, silent = false) ⇒ Object Also known as: log_remote_directory

Logs the existence of a remote file as an issue.

See Also:



334
335
336
337
338
339
340
341
342
343
344
 
# File 'lib/arachni/check/auditor.rb', line 334

def log_remote_file( page_or_response, silent = false )
    page = page_or_response.is_a?( Page ) ?
        page_or_response : page_or_response.to_page

    log_issue(
        vector: Element::Server.new( page.url ),
        page:   page
    )

    print_ok( "Found #{page.url}" ) if !silent
end

#log_remote_file_if_exists(url, silent = false, &block) ⇒ Object Also known as: log_remote_directory_if_exists

Note:

Ignores custom 404 responses.

Logs a remote file or directory if it exists.

See Also:



228
229
230
231
 
# File 'lib/arachni/check/auditor.rb', line 228

def log_remote_file_if_exists( url, silent = false, &block )
    Element::Server.new( page.url ).tap { |s| s.auditor = self }.
        log_remote_file_if_exists( url, silent, &block )
end

#match_and_log(patterns, &block) ⇒ Object

Matches an array of regular expressions against a string and logs the result as an issue.

See Also:



243
244
245
246
 
# File 'lib/arachni/check/auditor.rb', line 243

def match_and_log( patterns, &block )
    Element::Body.new( self.page.url ).tap { |b| b.auditor = self }.
        match_and_log( patterns, &block )
end

#max_issues ⇒ Object 



159
160
161
 
# File 'lib/arachni/check/auditor.rb', line 159

def max_issues
    self.class.max_issues
end

#preferred ⇒ Object

This method is abstract.

See Also:



367
368
369
 
# File 'lib/arachni/check/auditor.rb', line 367

def preferred
    []
end

#skip?(element) ⇒ Boolean

This is called right before an Element is audited and is used to determine whether to skip it or not.

Running checks can override this as they wish but at their own peril.

See Also:

  • Page#audit?


382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
 
# File 'lib/arachni/check/auditor.rb', line 382

def skip?( element )
    # This method also gets called from Auditable#audit to check mutations,
    # don't touch these, we're filtering at a higher level here, otherwise
    # we might mess up the audit.
    return true if !element.mutation? && audited?( element.coverage_id )
    return true if !page.audit_element?( element )

    # Don't audit elements which have been already logged as vulnerable
    # either by us or preferred checks.
    (preferred | [shortname]).each do |check|
        next if !framework.checks.include?( check )

        klass = framework.checks[check]
        next if !klass.info.include?(:issue)

        # No point in doing the following heavy deduplication check if there
        # are no issues logged to begin with.
        next if klass.issue_counter == 0

        if Data.issues.include?( klass.create_issue( vector: element ) )
            return true
        end
    end

    false
end

#trace_taint(resource, options = {}, &block) ⇒ Object

Traces the taint in the given ‘resource` and passes each page to the `block`.



571
572
573
574
575
576
577
578
579
 
# File 'lib/arachni/check/auditor.rb', line 571

def trace_taint( resource, options = {}, &block )
    with_browser_cluster do |cluster|
        cluster.trace_taint( resource, options ) do |result|
            # Mark the job as done and abort further analysis if the block
            # returns true.
            cluster.job_done( result.job ) if block.call( result.page )
        end
    end
end

#with_browser(&block) ⇒ Object

Note:

Operates in non-blocking mode.

See Also:

  • BrowserCluster::Worker#with_browser


595
596
597
598
 
# File 'lib/arachni/check/auditor.rb', line 595

def with_browser( &block )
    with_browser_cluster { |cluster| cluster.with_browser( &block ) }
    true
end

#with_browser_cluster(&block) ⇒ Object 



583
584
585
586
587
 
# File 'lib/arachni/check/auditor.rb', line 583

def with_browser_cluster( &block )
    return if !browser_cluster
    block.call browser_cluster
    true
end