Class: Brakeman::CheckWeakHash
Constant Summary
collapse
- DIGEST_CALLS =
[:base64digest, :digest, :hexdigest, :new]
Constants inherited
from BaseCheck
BaseCheck::CONFIDENCE
Constants included
from Util
Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION, Util::SESSION_SEXP
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_cookies, #process_default, #process_dstr, #process_if, #process_params
Methods included from Util
#array?, #block?, #call?, #camelize, #class_name, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #github_url, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #regexp?, #relative_path, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #string_interp?, #symbol?, #table_to_csv, #template_path_to_name, #true?, #truncate_table, #underscore
#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 112
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 126
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 if duplicate? result
add_result result
input = nil
call = result[:call]
if DIGEST_CALLS.include? call.method
if input = user_input_as_arg?(call)
confidence = CONFIDENCE[:high]
elsif input = hashing_password?(call)
confidence = CONFIDENCE[:high]
else
confidence = CONFIDENCE[:med]
end
else
confidence = CONFIDENCE[:med]
end
alg = case call.target.last
when :MD5
" (MD5)"
when :SHA1
" (SHA1)"
else
""
end
warn :result => result,
:warning_type => "Weak Hash",
:warning_code => :weak_hash_digest,
:message => "Weak hashing algorithm#{alg} used",
:confidence => confidence,
:user_input => input
end
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#process_hmac_result(result) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 61
def process_hmac_result result
return if duplicate? result
add_result result
call = result[:call]
alg = case call.third_arg.last
when :MD5
'MD5'
when :SHA1
'SHA1'
else
return
end
warn :result => result,
:warning_type => "Weak Hash",
:warning_code => :weak_hash_hmac,
:message => "Weak hashing algorithm (#{alg}) used in HMAC",
:confidence => CONFIDENCE[:med]
end
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#process_ivar(exp) ⇒ Object
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# File 'lib/brakeman/checks/check_weak_hash.rb', line 136
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 144
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 83
def process_openssl_result result
return if duplicate? result
add_result 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 => "Weak hashing algorithm (#{alg}) used",
:confidence => CONFIDENCE[:med]
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 102
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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