Class: Brakeman::CheckWeakHash
Constant Summary
collapse
- DIGEST_CALLS =
[:base64digest, :digest, :hexdigest, :new]
Constants inherited
from BaseCheck
BaseCheck::CONFIDENCE
Constants included
from Util
Util::ALL_COOKIES, Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::DIR_CONST, Util::LITERALS, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_COOKIES, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::REQUEST_REQUEST_PARAMETERS, Util::SAFE_LITERAL, Util::SESSION, Util::SESSION_SEXP, Util::SIMPLE_LITERALS
SexpProcessor::VERSION
Instance Attribute Summary
Attributes inherited from BaseCheck
#tracker, #warnings
#context, #env, #expected
Instance Method Summary
collapse
Methods inherited from BaseCheck
#add_result, inherited, #initialize, #process_array, #process_cookies, #process_default, #process_dstr, #process_if, #process_params
Methods included from Messages
#msg, #msg_code, #msg_cve, #msg_file, #msg_input, #msg_lit, #msg_plain, #msg_version
Methods included from Util
#all_literals?, #array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #cookies?, #dir_glob?, #false?, #hash?, #hash_access, #hash_insert, #hash_iterate, #hash_values, #integer?, #kwsplat?, #literal?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #recurse_check?, #regexp?, #remove_kwsplat, #request_headers?, #request_value?, #result?, #safe_literal, #safe_literal?, #safe_literal_target?, #set_env_defaults, #sexp?, #simple_literal?, #string?, #string_interp?, #symbol?, #template_path_to_name, #true?, #underscore
#current_file, #process_all, #process_all!, #process_call_args, #process_call_defn?, #process_class, #process_module
#in_context, #initialize, #process, processors, #scope
Instance Method Details
#hashing_password?(call) ⇒ Boolean
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 111
def hashing_password? call
call.each_arg do |arg|
@has_password = false
process arg
if @has_password
return @has_password
end
end
nil
end
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#process_call(exp) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 125
def process_call exp
if exp.method == :password
@has_password = exp
else
process_default exp
end
exp
end
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#process_hash_result(result) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 24
def process_hash_result result
return unless original? result
input = nil
call = result[:call]
if DIGEST_CALLS.include? call.method
if input = user_input_as_arg?(call)
confidence = :high
elsif input = hashing_password?(call)
confidence = :high
else
confidence = :medium
end
else
confidence = :medium
end
message = msg("Weak hashing algorithm used")
case call.target.last
when :MD5
message << ": " << msg_lit("MD5")
when :SHA1
message << ": " << msg_lit("SHA1")
end
warn :result => result,
:warning_type => "Weak Hash",
:warning_code => :weak_hash_digest,
:message => message,
:confidence => confidence,
:user_input => input,
:cwe_id => [328]
end
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#process_hmac_result(result) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 60
def process_hmac_result result
return unless original? result
call = result[:call]
message = msg("Weak hashing algorithm used in HMAC")
case call.third_arg.last
when :MD5
message << ": " << msg_lit("MD5")
when :SHA1
message << ": " << msg_lit("SHA1")
end
warn :result => result,
:warning_type => "Weak Hash",
:warning_code => :weak_hash_hmac,
:message => message,
:confidence => :medium,
:cwe_id => [328]
end
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#process_ivar(exp) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 135
def process_ivar exp
if exp.value == :@password
@has_password = exp
end
exp
end
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#process_lvar(exp) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 143
def process_lvar exp
if exp.value == :password
@has_password = exp
end
exp
end
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#process_openssl_result(result) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 82
def process_openssl_result result
return unless original? result
arg = result[:call].first_arg
if string? arg
alg = arg.value.upcase
if alg == 'MD5' or alg == 'SHA1'
warn :result => result,
:warning_type => "Weak Hash",
:warning_code => :weak_hash_digest,
:message => msg("Weak hashing algorithm used: ", msg_lit(alg)),
:confidence => :medium,
:cwe_id => [328]
end
end
end
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#run_check ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 10
def run_check
tracker.find_call(:targets => [:'Digest::MD5', :'Digest::SHA1', :'OpenSSL::Digest::MD5', :'OpenSSL::Digest::SHA1'], :nested => true).each do |result|
process_hash_result result
end
tracker.find_call(:target => :'Digest::HMAC', :methods => [:new, :hexdigest], :nested => true).each do |result|
process_hmac_result result
end
tracker.find_call(:targets => [:'OpenSSL::Digest::Digest', :'OpenSSL::Digest'], :method => :new).each do |result|
process_openssl_result result
end
end
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 101
def user_input_as_arg? call
call.each_arg do |arg|
if input = include_user_input?(arg)
return input
end
end
nil
end
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