Class: GAVerify::Handler

Inherits:
Object
  • Object
show all
Defined in:
lib/ga_verify/handler.rb

Direct Known Subclasses

Server

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Handler

Returns a new instance of Handler.



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# File 'lib/ga_verify/handler.rb', line 8

def initialize
  @last_seen   = Hash.new(0)
  @used_tokens = Hash.new{Hash.new(0)}
end

Instance Method Details

#check_user(user, token) ⇒ Object 



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# File 'lib/ga_verify/handler.rb', line 13

def check_user user, token
  unless user =~ /^[a-z]+$/
    return GAVerify::Result::BAD_USER
  end
  unless File.exists? "/home/#{user}"
    return GAVerify::Result::BAD_USER
  end
  path = GAVerify::Paths.config_path(user)
  unless File.exists? path
    return GAVerify::Result::NO_GOOGLE_AUTH
  end
  now = Time.now.to_i
  # Max one login every 15s
  if @last_seen[user] >= now - 15
    return GAVerify::Result::BAD_TOKEN
  end
  @last_seen[user] = now

  secret = File.open(path, 'r').first.strip
  totp = ROTP::TOTP.new(secret)

  # Allow +- 1 token
  times = [now - 30, now, now + 30]
  if times.any?{|time| totp.verify(token, time)}
    # disallow token re-use within 10 minutes
    if @used_tokens[user][token] < now - 600
      @used_tokens[user][token] = now
      # Cleanup
      @used_tokens[user].reject!{|k,v| used_tokens[user][token] < now - 600}
      return GAVerify::Result::SUCCESS
    end
  end
  return GAVerify::Result::BAD_TOKEN
end