/usr/lib/ruby/vendor_ruby/mixlib/authentication/signatureverification.rb is in ruby-mixlib-authentication 1.3.0-2.
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# Author:: Christopher Brown (<cb@opscode.com>)
# Author:: Christopher Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2009, 2010 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'net/http'
require 'forwardable'
require 'mixlib/authentication'
require 'mixlib/authentication/http_authentication_request'
require 'mixlib/authentication/signedheaderauth'
module Mixlib
module Authentication
SignatureResponse = Struct.new(:name)
class SignatureVerification
extend Forwardable
def_delegator :@auth_request, :http_method
def_delegator :@auth_request, :path
def_delegator :@auth_request, :signing_description
def_delegator :@auth_request, :user_id
def_delegator :@auth_request, :timestamp
def_delegator :@auth_request, :host
def_delegator :@auth_request, :request_signature
def_delegator :@auth_request, :content_hash
def_delegator :@auth_request, :request
include Mixlib::Authentication::SignedHeaderAuth
def initialize(request=nil)
@auth_request = HTTPAuthenticationRequest.new(request) if request
@valid_signature, @valid_timestamp, @valid_content_hash = false, false, false
@hashed_body = nil
end
def authenticate_user_request(request, user_lookup, time_skew=(15*60))
@auth_request = HTTPAuthenticationRequest.new(request)
authenticate_request(user_lookup, time_skew)
end
# Takes the request, boils down the pieces we are interested in,
# looks up the user, generates a signature, and compares to
# the signature in the request
# ====Headers
#
# X-Ops-Sign: algorithm=sha1;version=1.0;
# X-Ops-UserId: <user_id>
# X-Ops-Timestamp:
# X-Ops-Content-Hash:
# X-Ops-Authorization-#{line_number}
def authenticate_request(user_secret, time_skew=(15*60))
Mixlib::Authentication::Log.debug "Initializing header auth : #{request.inspect}"
@user_secret = user_secret
@allowed_time_skew = time_skew # in seconds
begin
parts = parse_signing_description
# version 1.0 clients don't include their algorithm in the
# signing description, so default to sha1
parts[:algorithm] ||= 'sha1'
verify_signature(parts[:algorithm], parts[:version])
verify_timestamp
verify_content_hash
rescue StandardError=>se
raise AuthenticationError,"Failed to authenticate user request. Check your client key and clock: #{se.message}", se.backtrace
end
if valid_request?
SignatureResponse.new(user_id)
else
nil
end
end
def valid_signature?
@valid_signature
end
def valid_timestamp?
@valid_timestamp
end
def valid_content_hash?
@valid_content_hash
end
def valid_request?
valid_signature? && valid_timestamp? && valid_content_hash?
end
# The authorization header is a Base64-encoded version of an RSA signature.
# The client sent it on multiple header lines, starting at index 1 -
# X-Ops-Authorization-1, X-Ops-Authorization-2, etc. Pull them out and
# concatenate.
def headers
@headers ||= request.env.inject({ }) { |memo, kv| memo[$2.gsub(/\-/,"_").downcase.to_sym] = kv[1] if kv[0] =~ /^(HTTP_)(.*)/; memo }
end
private
def assert_required_headers_present
MANDATORY_HEADERS.each do |header|
unless headers.key?(header)
raise MissingAuthenticationHeader, "required authentication header #{header.to_s.upcase} missing"
end
end
end
def verify_signature(algorithm, version)
candidate_block = canonicalize_request(algorithm, version)
request_decrypted_block = @user_secret.public_decrypt(Base64.decode64(request_signature))
@valid_signature = (request_decrypted_block == candidate_block)
# Keep the debug messages lined up so it's easy to scan them
Mixlib::Authentication::Log.debug("Verifying request signature:")
Mixlib::Authentication::Log.debug(" Expected Block is: '#{candidate_block}'")
Mixlib::Authentication::Log.debug("Decrypted block is: '#{request_decrypted_block}'")
Mixlib::Authentication::Log.debug("Signatures match? : '#{@valid_signature}'")
@valid_signature
rescue => e
Mixlib::Authentication::Log.debug("Failed to verify request signature: #{e.class.name}: #{e.message}")
@valid_signature = false
end
def verify_timestamp
@valid_timestamp = timestamp_within_bounds?(Time.parse(timestamp), Time.now)
end
def verify_content_hash
@valid_content_hash = (content_hash == hashed_body)
# Keep the debug messages lined up so it's easy to scan them
Mixlib::Authentication::Log.debug("Expected content hash is: '#{hashed_body}'")
Mixlib::Authentication::Log.debug(" Request Content Hash is: '#{content_hash}'")
Mixlib::Authentication::Log.debug(" Hashes match?: #{@valid_content_hash}")
@valid_content_hash
end
# The request signature is based on any file attached, if any. Otherwise
# it's based on the body of the request.
def hashed_body
unless @hashed_body
# TODO: tim: 2009-112-28: It'd be nice to remove this special case, and
# always hash the entire request body. In the file case it would just be
# expanded multipart text - the entire body of the POST.
#
# Pull out any file that was attached to this request, using multipart
# form uploads.
# Depending on the server we're running in, multipart form uploads are
# handed to us differently.
# - In Passenger (Cookbooks Community Site), the File is handed to us
# directly in the params hash. The name is whatever the client used,
# its value is therefore a File or Tempfile.
# e.g. request['file_param'] = File
#
# - In Merb (Chef server), the File is wrapped. The original parameter
# name used for the file is used, but its value is a Hash. Within
# the hash is a name/value pair named 'file' which actually
# contains the Tempfile instance.
# e.g. request['file_param'] = { :file => Tempfile }
file_param = request.params.values.find { |value| value.respond_to?(:read) }
# No file_param; we're running in Merb, or it's just not there..
if file_param.nil?
hash_param = request.params.values.find { |value| value.respond_to?(:has_key?) } # Hash responds to :has_key? .
if !hash_param.nil?
file_param = hash_param.values.find { |value| value.respond_to?(:read) } # File/Tempfile responds to :read.
end
end
# Any file that's included in the request is hashed if it's there. Otherwise,
# we hash the body.
if file_param
Mixlib::Authentication::Log.debug "Digesting file_param: '#{file_param.inspect}'"
@hashed_body = digester.hash_file(file_param)
else
body = request.raw_post
Mixlib::Authentication::Log.debug "Digesting body: '#{body}'"
@hashed_body = digester.hash_string(body)
end
end
@hashed_body
end
# Compare the request timestamp with boundary time
#
#
# ====Parameters
# time1<Time>:: minuend
# time2<Time>:: subtrahend
#
def timestamp_within_bounds?(time1, time2)
time_diff = (time2-time1).abs
is_allowed = (time_diff < @allowed_time_skew)
Mixlib::Authentication::Log.debug "Request time difference: #{time_diff}, within #{@allowed_time_skew} seconds? : #{!!is_allowed}"
is_allowed
end
end
end
end
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