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author | Pratik Naik <pratiknaik@gmail.com> | 2009-04-22 15:26:03 +0100 |
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committer | Pratik Naik <pratiknaik@gmail.com> | 2009-04-22 15:26:03 +0100 |
commit | 5f3f100ce2d689480da85abc88e5e940cf90189e (patch) | |
tree | 15c1a05a5308a9eea56d7f0889ac46d9cac5b57c /actionpack/lib/action_controller/base/http_authentication.rb | |
parent | d758d996d1b66e2a65640f79f01ce2ac674d7ed5 (diff) | |
parent | ca49299434bc764b667cd86846d892e91a150ef3 (diff) | |
download | rails-5f3f100ce2d689480da85abc88e5e940cf90189e.tar.gz rails-5f3f100ce2d689480da85abc88e5e940cf90189e.tar.bz2 rails-5f3f100ce2d689480da85abc88e5e940cf90189e.zip |
Merge branch 'master' into active_model
Conflicts:
activeresource/lib/active_resource/validations.rb
Diffstat (limited to 'actionpack/lib/action_controller/base/http_authentication.rb')
-rw-r--r-- | actionpack/lib/action_controller/base/http_authentication.rb | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/base/http_authentication.rb b/actionpack/lib/action_controller/base/http_authentication.rb new file mode 100644 index 0000000000..b6b5267c66 --- /dev/null +++ b/actionpack/lib/action_controller/base/http_authentication.rb @@ -0,0 +1,304 @@ +module ActionController + module HttpAuthentication + # Makes it dead easy to do HTTP Basic authentication. + # + # Simple Basic example: + # + # class PostsController < ApplicationController + # USER_NAME, PASSWORD = "dhh", "secret" + # + # before_filter :authenticate, :except => [ :index ] + # + # def index + # render :text => "Everyone can see me!" + # end + # + # def edit + # render :text => "I'm only accessible if you know the password" + # end + # + # private + # def authenticate + # authenticate_or_request_with_http_basic do |user_name, password| + # user_name == USER_NAME && password == PASSWORD + # end + # end + # end + # + # + # Here is a more advanced Basic example where only Atom feeds and the XML API is protected by HTTP authentication, + # the regular HTML interface is protected by a session approach: + # + # class ApplicationController < ActionController::Base + # before_filter :set_account, :authenticate + # + # protected + # def set_account + # @account = Account.find_by_url_name(request.subdomains.first) + # end + # + # def authenticate + # case request.format + # when Mime::XML, Mime::ATOM + # if user = authenticate_with_http_basic { |u, p| @account.users.authenticate(u, p) } + # @current_user = user + # else + # request_http_basic_authentication + # end + # else + # if session_authenticated? + # @current_user = @account.users.find(session[:authenticated][:user_id]) + # else + # redirect_to(login_url) and return false + # end + # end + # end + # end + # + # In your integration tests, you can do something like this: + # + # def test_access_granted_from_xml + # get( + # "/notes/1.xml", nil, + # :authorization => ActionController::HttpAuthentication::Basic.encode_credentials(users(:dhh).name, users(:dhh).password) + # ) + # + # assert_equal 200, status + # end + # + # Simple Digest example: + # + # require 'digest/md5' + # class PostsController < ApplicationController + # REALM = "SuperSecret" + # USERS = {"dhh" => "secret", #plain text password + # "dap" => Digest:MD5::hexdigest(["dap",REALM,"secret"].join(":")) #ha1 digest password + # + # before_filter :authenticate, :except => [:index] + # + # def index + # render :text => "Everyone can see me!" + # end + # + # def edit + # render :text => "I'm only accessible if you know the password" + # end + # + # private + # def authenticate + # authenticate_or_request_with_http_digest(REALM) do |username| + # USERS[username] + # end + # end + # end + # + # NOTE: The +authenticate_or_request_with_http_digest+ block must return the user's password or the ha1 digest hash so the framework can appropriately + # hash to check the user's credentials. Returning +nil+ will cause authentication to fail. + # Storing the ha1 hash: MD5(username:realm:password), is better than storing a plain password. If + # the password file or database is compromised, the attacker would be able to use the ha1 hash to + # authenticate as the user at this +realm+, but would not have the user's password to try using at + # other sites. + # + # On shared hosts, Apache sometimes doesn't pass authentication headers to + # FCGI instances. If your environment matches this description and you cannot + # authenticate, try this rule in your Apache setup: + # + # RewriteRule ^(.*)$ dispatch.fcgi [E=X-HTTP_AUTHORIZATION:%{HTTP:Authorization},QSA,L] + module Basic + extend self + + module ControllerMethods + def authenticate_or_request_with_http_basic(realm = "Application", &login_procedure) + authenticate_with_http_basic(&login_procedure) || request_http_basic_authentication(realm) + end + + def authenticate_with_http_basic(&login_procedure) + HttpAuthentication::Basic.authenticate(self, &login_procedure) + end + + def request_http_basic_authentication(realm = "Application") + HttpAuthentication::Basic.authentication_request(self, realm) + end + end + + def authenticate(controller, &login_procedure) + unless authorization(controller.request).blank? + login_procedure.call(*user_name_and_password(controller.request)) + end + end + + def user_name_and_password(request) + decode_credentials(request).split(/:/, 2) + end + + def authorization(request) + request.env['HTTP_AUTHORIZATION'] || + request.env['X-HTTP_AUTHORIZATION'] || + request.env['X_HTTP_AUTHORIZATION'] || + request.env['REDIRECT_X_HTTP_AUTHORIZATION'] + end + + def decode_credentials(request) + ActiveSupport::Base64.decode64(authorization(request).split.last || '') + end + + def encode_credentials(user_name, password) + "Basic #{ActiveSupport::Base64.encode64("#{user_name}:#{password}")}" + end + + def authentication_request(controller, realm) + controller.headers["WWW-Authenticate"] = %(Basic realm="#{realm.gsub(/"/, "")}") + controller.__send__ :render, :text => "HTTP Basic: Access denied.\n", :status => :unauthorized + end + end + + module Digest + extend self + + module ControllerMethods + def authenticate_or_request_with_http_digest(realm = "Application", &password_procedure) + authenticate_with_http_digest(realm, &password_procedure) || request_http_digest_authentication(realm) + end + + # Authenticate with HTTP Digest, returns true or false + def authenticate_with_http_digest(realm = "Application", &password_procedure) + HttpAuthentication::Digest.authenticate(self, realm, &password_procedure) + end + + # Render output including the HTTP Digest authentication header + def request_http_digest_authentication(realm = "Application", message = nil) + HttpAuthentication::Digest.authentication_request(self, realm, message) + end + end + + # Returns false on a valid response, true otherwise + def authenticate(controller, realm, &password_procedure) + authorization(controller.request) && validate_digest_response(controller.request, realm, &password_procedure) + end + + def authorization(request) + request.env['HTTP_AUTHORIZATION'] || + request.env['X-HTTP_AUTHORIZATION'] || + request.env['X_HTTP_AUTHORIZATION'] || + request.env['REDIRECT_X_HTTP_AUTHORIZATION'] + end + + # Raises error unless the request credentials response value matches the expected value. + # First try the password as a ha1 digest password. If this fails, then try it as a plain + # text password. + def validate_digest_response(request, realm, &password_procedure) + credentials = decode_credentials_header(request) + valid_nonce = validate_nonce(request, credentials[:nonce]) + + if valid_nonce && realm == credentials[:realm] && opaque == credentials[:opaque] + password = password_procedure.call(credentials[:username]) + + [true, false].any? do |password_is_ha1| + expected = expected_response(request.env['REQUEST_METHOD'], request.env['REQUEST_URI'], credentials, password, password_is_ha1) + expected == credentials[:response] + end + end + end + + # Returns the expected response for a request of +http_method+ to +uri+ with the decoded +credentials+ and the expected +password+ + # Optional parameter +password_is_ha1+ is set to +true+ by default, since best practice is to store ha1 digest instead + # of a plain-text password. + def expected_response(http_method, uri, credentials, password, password_is_ha1=true) + ha1 = password_is_ha1 ? password : ha1(credentials, password) + ha2 = ::Digest::MD5.hexdigest([http_method.to_s.upcase, uri].join(':')) + ::Digest::MD5.hexdigest([ha1, credentials[:nonce], credentials[:nc], credentials[:cnonce], credentials[:qop], ha2].join(':')) + end + + def ha1(credentials, password) + ::Digest::MD5.hexdigest([credentials[:username], credentials[:realm], password].join(':')) + end + + def encode_credentials(http_method, credentials, password, password_is_ha1) + credentials[:response] = expected_response(http_method, credentials[:uri], credentials, password, password_is_ha1) + "Digest " + credentials.sort_by {|x| x[0].to_s }.inject([]) {|a, v| a << "#{v[0]}='#{v[1]}'" }.join(', ') + end + + def decode_credentials_header(request) + decode_credentials(authorization(request)) + end + + def decode_credentials(header) + header.to_s.gsub(/^Digest\s+/,'').split(',').inject({}) do |hash, pair| + key, value = pair.split('=', 2) + hash[key.strip.to_sym] = value.to_s.gsub(/^"|"$/,'').gsub(/'/, '') + hash + end + end + + def authentication_header(controller, realm) + controller.headers["WWW-Authenticate"] = %(Digest realm="#{realm}", qop="auth", algorithm=MD5, nonce="#{nonce}", opaque="#{opaque}") + end + + def authentication_request(controller, realm, message = nil) + message ||= "HTTP Digest: Access denied.\n" + authentication_header(controller, realm) + controller.__send__ :render, :text => message, :status => :unauthorized + end + + # Uses an MD5 digest based on time to generate a value to be used only once. + # + # A server-specified data string which should be uniquely generated each time a 401 response is made. + # It is recommended that this string be base64 or hexadecimal data. + # Specifically, since the string is passed in the header lines as a quoted string, the double-quote character is not allowed. + # + # The contents of the nonce are implementation dependent. + # The quality of the implementation depends on a good choice. + # A nonce might, for example, be constructed as the base 64 encoding of + # + # => time-stamp H(time-stamp ":" ETag ":" private-key) + # + # where time-stamp is a server-generated time or other non-repeating value, + # ETag is the value of the HTTP ETag header associated with the requested entity, + # and private-key is data known only to the server. + # With a nonce of this form a server would recalculate the hash portion after receiving the client authentication header and + # reject the request if it did not match the nonce from that header or + # if the time-stamp value is not recent enough. In this way the server can limit the time of the nonce's validity. + # The inclusion of the ETag prevents a replay request for an updated version of the resource. + # (Note: including the IP address of the client in the nonce would appear to offer the server the ability + # to limit the reuse of the nonce to the same client that originally got it. + # However, that would break proxy farms, where requests from a single user often go through different proxies in the farm. + # Also, IP address spoofing is not that hard.) + # + # An implementation might choose not to accept a previously used nonce or a previously used digest, in order to + # protect against a replay attack. Or, an implementation might choose to use one-time nonces or digests for + # POST or PUT requests and a time-stamp for GET requests. For more details on the issues involved see Section 4 + # of this document. + # + # The nonce is opaque to the client. Composed of Time, and hash of Time with secret + # key from the Rails session secret generated upon creation of project. Ensures + # the time cannot be modifed by client. + def nonce(time = Time.now) + t = time.to_i + hashed = [t, secret_key] + digest = ::Digest::MD5.hexdigest(hashed.join(":")) + Base64.encode64("#{t}:#{digest}").gsub("\n", '') + end + + # Might want a shorter timeout depending on whether the request + # is a PUT or POST, and if client is browser or web service. + # Can be much shorter if the Stale directive is implemented. This would + # allow a user to use new nonce without prompting user again for their + # username and password. + def validate_nonce(request, value, seconds_to_timeout=5*60) + t = Base64.decode64(value).split(":").first.to_i + nonce(t) == value && (t - Time.now.to_i).abs <= seconds_to_timeout + end + + # Opaque based on random generation - but changing each request? + def opaque() + ::Digest::MD5.hexdigest(secret_key) + end + + # Set in /initializers/session_store.rb, and loaded even if sessions are not in use. + def secret_key + ActionController::Base.session_options[:secret] + end + + end + end +end |