Success!

From b9930d24a05e47c36845d8607b12a45eea889be0 Mon Sep 17 00:00:00 2001 From: Patrick Cloke Date: Wed, 1 Apr 2020 08:48:00 -0400 Subject: Support SAML in the user interactive authentication workflow. (#7102) --- synapse/handlers/auth.py | 116 +++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 112 insertions(+), 4 deletions(-) (limited to 'synapse/handlers/auth.py') diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index 2ce1425dfa..7c09d15a72 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -53,6 +53,31 @@ from ._base import BaseHandler logger = logging.getLogger(__name__) +SUCCESS_TEMPLATE = """ + + +Success! + + + + + +

Thank you

You may now close this window and return to the application

+ + +""" + + class AuthHandler(BaseHandler): SESSION_EXPIRE_MS = 48 * 60 * 60 * 1000 @@ -91,6 +116,7 @@ class AuthHandler(BaseHandler): self.hs = hs # FIXME better possibility to access registrationHandler later? self.macaroon_gen = hs.get_macaroon_generator() self._password_enabled = hs.config.password_enabled + self._saml2_enabled = hs.config.saml2_enabled # we keep this as a list despite the O(N^2) implication so that we can # keep PASSWORD first and avoid confusing clients which pick the first @@ -106,6 +132,13 @@ class AuthHandler(BaseHandler): if t not in login_types: login_types.append(t) self._supported_login_types = login_types + # Login types and UI Auth types have a heavy overlap, but are not + # necessarily identical. Login types have SSO (and other login types) + # added in the rest layer, see synapse.rest.client.v1.login.LoginRestServerlet.on_GET. + ui_auth_types = login_types.copy() + if self._saml2_enabled: + ui_auth_types.append(LoginType.SSO) + self._supported_ui_auth_types = ui_auth_types # Ratelimiter for failed auth during UIA. Uses same ratelimit config # as per `rc_login.failed_attempts`. @@ -113,10 +146,21 @@ class AuthHandler(BaseHandler): self._clock = self.hs.get_clock() - # Load the SSO redirect confirmation page HTML template + # Load the SSO HTML templates. + + # The following template is shown to the user during a client login via SSO, + # after the SSO completes and before redirecting them back to their client. + # It notifies the user they are about to give access to their matrix account + # to the client. self._sso_redirect_confirm_template = load_jinja2_templates( hs.config.sso_redirect_confirm_template_dir, ["sso_redirect_confirm.html"], )[0] + # The following template is shown during user interactive authentication + # in the fallback auth scenario. It notifies the user that they are + # authenticating for an operation to occur on their account. + self._sso_auth_confirm_template = load_jinja2_templates( + hs.config.sso_redirect_confirm_template_dir, ["sso_auth_confirm.html"], + )[0] self._server_name = hs.config.server_name @@ -130,6 +174,7 @@ class AuthHandler(BaseHandler): request: SynapseRequest, request_body: Dict[str, Any], clientip: str, + description: str, ): """ Checks that the user is who they claim to be, via a UI auth. @@ -147,6 +192,9 @@ class AuthHandler(BaseHandler): clientip: The IP address of the client. + description: A human readable string to be displayed to the user that + describes the operation happening on their account. + Returns: defer.Deferred[dict]: the parameters for this request (which may have been given only in a previous call). @@ -175,11 +223,11 @@ class AuthHandler(BaseHandler): ) # build a list of supported flows - flows = [[login_type] for login_type in self._supported_login_types] + flows = [[login_type] for login_type in self._supported_ui_auth_types] try: result, params, _ = yield self.check_auth( - flows, request, request_body, clientip + flows, request, request_body, clientip, description ) except LoginError: # Update the ratelimite to say we failed (`can_do_action` doesn't raise). @@ -193,7 +241,7 @@ class AuthHandler(BaseHandler): raise # find the completed login type - for login_type in self._supported_login_types: + for login_type in self._supported_ui_auth_types: if login_type not in result: continue @@ -224,6 +272,7 @@ class AuthHandler(BaseHandler): request: SynapseRequest, clientdict: Dict[str, Any], clientip: str, + description: str, ): """ Takes a dictionary sent by the client in the login / registration @@ -250,6 +299,9 @@ class AuthHandler(BaseHandler): clientip: The IP address of the client. + description: A human readable string to be displayed to the user that + describes the operation happening on their account. + Returns: defer.Deferred[dict, dict, str]: a deferred tuple of (creds, params, session_id). @@ -299,12 +351,18 @@ class AuthHandler(BaseHandler): comparator = (request.uri, request.method, clientdict) if "ui_auth" not in session: session["ui_auth"] = comparator + self._save_session(session) elif session["ui_auth"] != comparator: raise SynapseError( 403, "Requested operation has changed during the UI authentication session.", ) + # Add a human readable description to the session. + if "description" not in session: + session["description"] = description + self._save_session(session) + if not authdict: raise InteractiveAuthIncompleteError( self._auth_dict_for_flows(flows, session) @@ -991,6 +1049,56 @@ class AuthHandler(BaseHandler): else: return defer.succeed(False) + def start_sso_ui_auth(self, redirect_url: str, session_id: str) -> str: + """ + Get the HTML for the SSO redirect confirmation page. + + Args: + redirect_url: The URL to redirect to the SSO provider. + session_id: The user interactive authentication session ID. + + Returns: + The HTML to render. + """ + session = self._get_session_info(session_id) + # Get the human readable operation of what is occurring, falling back to + # a generic message if it isn't available for some reason. + description = session.get("description", "modify your account") + return self._sso_auth_confirm_template.render( + description=description, redirect_url=redirect_url, + ) + + def complete_sso_ui_auth( + self, registered_user_id: str, session_id: str, request: SynapseRequest, + ): + """Having figured out a mxid for this user, complete the HTTP request + + Args: + registered_user_id: The registered user ID to complete SSO login for. + request: The request to complete. + client_redirect_url: The URL to which to redirect the user at the end of the + process. + """ + # Mark the stage of the authentication as successful. + sess = self._get_session_info(session_id) + if "creds" not in sess: + sess["creds"] = {} + creds = sess["creds"] + + # Save the user who authenticated with SSO, this will be used to ensure + # that the account be modified is also the person who logged in. + creds[LoginType.SSO] = registered_user_id + self._save_session(sess) + + # Render the HTML and return. + html_bytes = SUCCESS_TEMPLATE.encode("utf8") + request.setResponseCode(200) + request.setHeader(b"Content-Type", b"text/html; charset=utf-8") + request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),)) + + request.write(html_bytes) + finish_request(request) + def complete_sso_login( self, registered_user_id: str, -- cgit 1.4.1