Class: AWSAuth::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/aws-auth.rb

Constant Summary collapse

VERSION = 
"0.9.1"
ROOT_DIR = 
ENV['AWS_ROOT_DIR'] || File.join(File.dirname(__FILE__),'..')
DEFAULT_PASSWORD = 
"pass@word1"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Base

Returns a new instance of Base.



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# File 'lib/aws-auth.rb', line 24

def initialize(app)
  @app = app
  AWSAuth::User.establish_connection(AWSAuth::Base.config[:auth])
end

Class Method Details

.config ⇒ Object 



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# File 'lib/aws-auth.rb', line 16

def self.config
  @@config ||= load_config()
end

.config_path=(val) ⇒ Object 



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# File 'lib/aws-auth.rb', line 20

def self.config_path=(val)
  @@config_path = val
end

.generate_key ⇒ Object 



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# File 'lib/aws-auth.rb', line 89

def self.generate_key
  abc = %{ABCDEF0123456789}
  (1..20).map { abc[rand(abc.size),1] }.join
end

.generate_secret ⇒ Object 



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# File 'lib/aws-auth.rb', line 84

def self.generate_secret
  abc = %{ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz}
  (1..40).map { abc[rand(abc.size),1] }.join
end

.hmac_sha1(key, s) ⇒ Object 



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# File 'lib/aws-auth.rb', line 94

def self.hmac_sha1(key, s)
  ipad = [].fill(0x36, 0, 64)
  opad = [].fill(0x5C, 0, 64)
  key = key.unpack("C*")
  if key.length < 64 then
    key += [].fill(0, 0, 64-key.length)
  end

  inner = []
  64.times { |i| inner.push(key[i] ^ ipad[i]) }
  inner += s.unpack("C*")

  outer = []
  64.times { |i| outer.push(key[i] ^ opad[i]) }
  outer = outer.pack("c*")
  outer += Digest::SHA1.digest(inner.pack("c*"))

  return Base64::encode64(Digest::SHA1.digest(outer)).chomp
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/aws-auth.rb', line 29

def call(env)
  date_s = env['HTTP_X_AMZ_DATE'] || env['HTTP_DATE']
  request = Rack::Request.new(env)
  auth = Rack::Auth::Basic::Request.new(env)

  # Basic Auth
  if auth.provided? && auth.basic?
    user = AWSAuth::User.(auth.credentials[0])
    unless user.nil?
      if user.password == AWSAuth::Base.hmac_sha1( auth.credentials[1], user.secret )
        env['AWS_AUTH_USER'] = user
      end
    end
  # Route 53
  elsif env['HTTP_X_AMZN_AUTHORIZATION'] =~ /^AWS3-HTTPS AWSAccessKeyId=(.*),Algorithm=HmacSHA256,Signature=(.*)$/
    access_key = $1
    signature = $2
    user = AWSAuth::User.find_by_key(access_key)
    unless user.nil?
      hmac = HMAC::SHA256.new(user.secret)
      hmac.update(date_s)
      if Base64.encode64(hmac.digest).chomp == signature
        env['AWS_AUTH_USER'] = user
      end
    end
  # S3
  elsif env['HTTP_AUTHORIZATION'] =~ /^AWS (\w+):(.+)$/ || !request['Signature'].nil?
    meta, amz = {}, {}
    env.each do |k,v|
      k = k.downcase.gsub('_', '-')
      amz[$1] = v.strip if k =~ /^http-x-amz-([-\w]+)$/
      meta[$1] = v if k =~ /^http-x-amz-meta-([-\w]+)$/
    end

    auth, key_s, secret_s = *env['HTTP_AUTHORIZATION'].to_s.match(/^AWS (\w+):(.+)$/)
    if request.params.has_key?('Signature') and Time.at(request['Expires'].to_i) >= Time.now
      key_s, secret_s, date_s = request['AWSAccessKeyId'], request['Signature'], request['Expires']
    end
    uri = env['PATH_INFO']
    uri += "?" + env['QUERY_STRING'] if %w[acl versioning torrent].include?(env['QUERY_STRING'])
    canonical = [env['REQUEST_METHOD'], env['HTTP_CONTENT_MD5'], env['CONTENT_TYPE'],
	date_s, uri]
    amz.sort.each do |k, v|
      canonical[-1,0] = "x-amz-#{k}:#{v}"
    end

    user = AWSAuth::User.find_by_key key_s
    unless (user and secret_s != AWSAuth::Base.hmac_sha1(user.secret, canonical.map{|v|v.to_s.strip} * "\n")) || (user and user.deleted == 1)
      env['AWS_AUTH_USER'] = user
    end
  end

  @app.call(env)
end