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.

It also provides:

Author:

Constant Summary collapse

Format =

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

Element::Capabilities::Mutable::Format
ELEMENTS_WITH_INPUTS =

Non-DOM auditable elements.

[
    Element::Link, Element::Form, Element::Cookie, Element::Header,
    Element::LinkTemplate, Element::JSON, Element::XML
]
DOM_ELEMENTS_WITH_INPUTS =

Auditable DOM elements.

[
    Element::Link::DOM, Element::Form::DOM, Element::Cookie::DOM,
    Element::LinkTemplate::DOM, Element::UIInput::DOM, Element::UIForm::DOM
]
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:     ELEMENTS_WITH_INPUTS,

    dom_elements: DOM_ELEMENTS_WITH_INPUTS,

    # 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)

Returns:



225
226
227
 
# File 'lib/arachni/check/auditor.rb', line 225

def framework
  @framework
end

#page ⇒ Arachni::Page (readonly)

Returns Page object to be audited.

Returns:



222
223
224
 
# File 'lib/arachni/check/auditor.rb', line 222

def page
  @page
end

Class Method Details

.has_timeout_candidates? ⇒ Boolean

Returns:

  • (Boolean) 


43
44
45
 
# File 'lib/arachni/check/auditor.rb', line 43

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

.included(m) ⇒ Object 



69
70
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/arachni/check/auditor.rb', line 69

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
        # @param    [Element::Base, Array<Element::Base>]    restrict_to_elements
        #   Element types to check for.
        #
        # @return   [Bool]
        def self.check?( page, restrict_to_elements = nil, ignore_dom_depth = false )
            return false if issue_limit_reached?
            return true  if elements.empty?

            audit                = Arachni::Options.audit
            restrict_to_elements = [restrict_to_elements].flatten.compact

            # We use procs to make the decisions to avoid loading the page
            # element caches unless it's absolutely necessary.
            #
            # Also, it's better to audit Form & Cookie DOM elements only
            # after the page has gone through the browser, because then
            # we'll have some context in the metadata which can help us
            # optimize DOM audits.
            {
                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 { (ignore_dom_depth || page.dom.depth > 0) &&
                        audit.form_doms? && page.has_script? && !!page.forms.find(&:dom) },
                Element::Cookie            =>
                    proc { audit.cookies? && page.cookies.any? },
                Element::Cookie::DOM       =>
                    proc { (ignore_dom_depth || page.dom.depth > 0) &&
                        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::JSON              =>
                    proc { audit.jsons? && page.jsons.find { |e| e.inputs.any? } },
                Element::XML               =>
                    proc { audit.xmls? && page.xmls.find { |e| e.inputs.any? } },
                Element::UIInput             => false,
                Element::UIInput::DOM        =>
                    proc { audit.ui_inputs? && page.ui_inputs.any? },
                Element::UIForm            => false,
                Element::UIForm::DOM       =>
                    proc { audit.ui_forms? && page.ui_forms.any? },
                Element::Body              => !page.body.empty?,
                Element::GenericDOM        => page.has_script?,
                Element::Path              => true,
                Element::Server            => true
            }.each do |type, decider|
                next if restrict_to_elements.any? && !restrict_to_elements.include?( type )

                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 



39
40
41
 
# File 'lib/arachni/check/auditor.rb', line 39

def self.reset
    audited.clear
end

.timeout_audit_run ⇒ Object 



46
47
48
 
# File 'lib/arachni/check/auditor.rb', line 46

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_signature.

Uses #each_candidate_element to decide which elements to audit.

See Also:



550
551
552
553
554
555
556
557
558
559
560
 
# File 'lib/arachni/check/auditor.rb', line 550

def audit( payloads, opts = {}, &block )
    opts = OPTIONS.merge( opts )
    if !block_given?
        audit_signature( 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:



583
584
585
586
587
588
589
 
# File 'lib/arachni/check/auditor.rb', line 583

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_signature(payloads, opts = {}) ⇒ Object

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

Uses #each_candidate_element to decide which elements to audit.

See Also:



569
570
571
572
573
574
575
 
# File 'lib/arachni/check/auditor.rb', line 569

def audit_signature( payloads, opts = {} )
    opts = OPTIONS.merge( opts )
    each_candidate_element( opts[:elements] )do |e|
        e.signature_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:



597
598
599
600
601
602
603
 
# File 'lib/arachni/check/auditor.rb', line 597

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

Parameters:

  • id (#to_s) —

    Identifier of the object to be marked as audited.

See Also:



54
55
56
 
# File 'lib/arachni/check/auditor.rb', line 54

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

#audited?(id) ⇒ Bool

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

Parameters:

  • id (#to_s) —

    Identifier of the object to be checked.

Returns:

  • (Bool) —

    ‘true` if audited, `false` otherwise.

See Also:



65
66
67
 
# File 'lib/arachni/check/auditor.rb', line 65

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.

Parameters:

  • types (Array) (defaults to: []) —

    Element types to audit (see OPTIONS‘[:elements]`).

Yields:

  • (element) —

    Each candidate element.

Yield Parameters:



508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
 
# File 'lib/arachni/check/auditor.rb', line 508

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 )

            when Element::UIInput::DOM.type
                prepare_each_dom_element( page.ui_inputs, &block )

            when Element::UIForm::DOM.type
                prepare_each_dom_element( page.ui_forms, &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.

Parameters:

  • types (Array) (defaults to: []) —

    Element types to audit (see OPTIONS‘[:elements]`).

Yields:

  • (element) —

    Each candidate DOM element.

Yield Parameters:

  • (Arachni::Capabilities::Auditable::DOM) 


457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
 
# File 'lib/arachni/check/auditor.rb', line 457

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 !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 )

            when Element::JSON.type
                prepare_each_element( page.jsons, &block )

            when Element::XML.type
                prepare_each_element( page.xmls, &block )

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

#http ⇒ HTTP::Client

Returns:



235
236
237
 
# File 'lib/arachni/check/auditor.rb', line 235

def http
    HTTP::Client
end

#initialize(page, framework) ⇒ Object

Parameters:



229
230
231
232
 
# File 'lib/arachni/check/auditor.rb', line 229

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

#log(options) ⇒ Issue

Populates and logs an Issue.

Parameters:

  • options (Hash) —

    Issue initialization options.

Returns:



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
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
 
# File 'lib/arachni/check/auditor.rb', line 283

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.

Parameters:

Returns:

See Also:

  • create_issue


389
390
391
392
393
394
395
396
 
# File 'lib/arachni/check/auditor.rb', line 389

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

Logs the existence of a remote file as an issue.

Overloads:

  • #log_remote_file(response, silent = false) ⇒ Issue

    Parameters:

    • response (HTTP::Response)
    • silent (Bool) (defaults to: false) —

      If ‘false`, a message will be printed to stdout containing the status of the operation.

  • #log_remote_file(page, silent = false) ⇒ Issue

    Parameters:

    • page (Page)
    • silent (Bool) (defaults to: false) —

      If ‘false`, a message will be printed to stdout containing the status of the operation.

Returns:

See Also:



365
366
367
368
369
370
371
372
373
374
375
376
377
378
 
# File 'lib/arachni/check/auditor.rb', line 365

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

    issue = log_issue(
        vector: Element::Server.new( page.url ),
        proof:  page.response.status_line,
        page:   page
    )

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

    issue
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.

Parameters:

  • url (String) —

    Resource to check.

  • silent (Bool) (defaults to: false) —

    If ‘false`, a message will be printed to stdout containing the status of the operation.

  • block (Proc) —

    Called if the file exists, just before logging the issue, and is passed the HTTP response.

Returns:

  • (Object) —

    • ‘nil` if no URL was provided.

    • ‘false` if the request couldn’t be fired.

    • ‘true` if everything went fine.

See Also:



257
258
259
260
 
# File 'lib/arachni/check/auditor.rb', line 257

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

Parameters:

  • patterns (Array<Regexp>) —

    Array of regular expressions to be tested.

  • block (Block) —

    Block to verify matches before logging, must return ‘true`/`false`.

See Also:



272
273
274
275
 
# File 'lib/arachni/check/auditor.rb', line 272

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

#max_issues ⇒ Object 



179
180
181
 
# File 'lib/arachni/check/auditor.rb', line 179

def max_issues
    self.class.max_issues
end

#preferred ⇒ Object

This method is abstract.

See Also:



401
402
403
 
# File 'lib/arachni/check/auditor.rb', line 401

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.

Parameters:

Returns:

  • (Boolean) —

    ‘true` if the element should be skipped, `false` otherwise.

See Also:

  • Page#audit?


416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
 
# File 'lib/arachni/check/auditor.rb', line 416

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`.

Parameters:

  • resource (Page, String, HTTP::Response) —

    Resource to load and whose environment to trace, if given a ‘String` it will be treated it as a URL and will be loaded.

  • options (Hash) (defaults to: {}) —

    See BrowserCluster::Jobs::TaintTrace accessors.

  • block (Block) —

    Block to handle each page snapshot. If the ‘block` returns a `true` value, further analysis will be aborted.



616
617
618
619
620
621
622
623
624
 
# File 'lib/arachni/check/auditor.rb', line 616

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.

Parameters:

See Also:

  • BrowserCluster::Worker#with_browser


640
641
642
643
 
# File 'lib/arachni/check/auditor.rb', line 640

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

#with_browser_cluster(&block) ⇒ Object

Parameters:

  • block (Block) —

    Block to passed a BrowserCluster, if one is available.



628
629
630
631
632
 
# File 'lib/arachni/check/auditor.rb', line 628

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