]> System for Cross-Domain Identity Management (SCIM) Profile for Security Event Tokens (SETs) Independent Identity Inc
phil.hunt@independentid.com
Cisco Systems
ncamwing@cisco.com
Sailpoint Technologies
mike.kiser@sailpoint.com
Workday, Inc.
jennifer.winer@workday.com
SEC SCIM Identity Event SET Provisioning Token SCIM This specification defines a set of System for Cross-domain Identity Management (SCIM) Security Events using the Security Event Token (SET) specification (RFC 8417) to enable the asynchronous exchange of messages between SCIM Service Providers and receivers. This specification updates RFC 7643 by defining additional attributes for the "urn:ietf:params:scim:schemas:core:2.0:ServiceProviderConfig" schema, and it updates RFC 7644 with an optional new Asynchronous SCIM Request capability.
Introduction and Overview This specification defines Security Events for SCIM Service Providers and receivers as specified by Security Event Tokens (SETs) . In this specification, SCIM Security Events include asynchronous request completion, resource replication, and provisioning co-ordination. This specification defines the use of the HTTP header "Prefer: respond-async" to allow a SCIM Protocol Client to request an asynchronous response (see ). Using the HTTP protocol, a SCIM Protocol Client issues commands to a SCIM Service Provider using HTTP methods such as POST, PATCH, and DELETE that cause a state change to a SCIM Resource. When multiple independent SCIM Clients update SCIM Resources, individual clients become out of date as state changes occur. Some clients may need to be informed of these changes for co-ordination or reconciliation purposes. This could be done using periodic SCIM GET requests over time, but this rapidly becomes problematic as the number of changes and the number of resources increases. SCIM Events can be shared over an established Event Feed enabling receivers to monitor and trigger independent asynchronous action. This approach enables greater scale and timeliness, where only changed information is exchanged between parties. A SET conveys information about a state change that has occurred at a SCIM Service Provider. That SET may be of interest to one or more receivers. But instead of interpreting SETs as commands, each Event Receiver is able to determine the best local follow-up action to take within its own context. For example, a receiver can reconcile schema and resource type differences between domains.
Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.
Notational Conventions Throughout this document, all figures may contain spaces and extra line wrapping for readability and space limitations. Similarly, some URIs contained within examples have been shortened for space and readability reasons.
Definitions This specification uses definitions from the following specifications:
  • "JSON Web Token (JWT)" ,
  • "Security Event Token (SET)" , and
  • "System for Cross-domain Identity Management: Protocol" .
In JSON Web Tokens (JWTs) and Security Event Tokens, the term "claim" refers to JSON attribute values contained in a JWT structure. The term "claim" in tokens is used to indicate that an attribute value may not be verified and its accuracy can be questioned. In the context of SCIM, this distinction is not made. For this specification, the terms "claims" and "attributes" are interchangeable. For consistency, JWT and SET attributes registered by IANA will continue to be called "claims", while event information attributes (i.e., those in an event payload) will be referred to as "attributes". Additionally, the following terms are defined:
Attributes and Claims:
The JWT specification , upon which SET is based, uses the term "claims" to refer to attributes in a JSON token. In contrast, SCIM uses the term "attributes" to refer to JSON attributes. For the purposes of this document, the terms "attributes" and "claims" are equivalent.
Co-ordinated Provisioning (CP):
As defined in , in CP relationships, an Event Publisher and Receiver typically exchange resource change events without exchanging data (see ). For a receiver to know the value of the data, the Event Receiver usually calls back to the SCIM Event Publisher domain to receive a new copy of data (e.g., uses a SCIM GET request).
Domain-Based Replication (DBR):
As defined in , in the DBR mode, there is an administrative relationship spanning multiple operational domains; data shared in Events typically uses the "full" mode variation of change events (see ) including the "data" payload attribute. This eliminates the need for a callback to retrieve additional data.
Event Feed / Event Stream:
An Event Feed (or equivalently an Event Stream) is a logical series of events shared with a unique receiving client. A SET transfer (see and ) Service Provider may offer to allow Event Receivers to "subscribe" to specific event types or events about specific resources (see Feed Management events in ).
Event Receiver:
An entity typically receives events as described in and or via HTTP GET (see ). In the case of SET Push Transfer , the Event Receiver is an HTTP Service Endpoint that receives requests. In the case of SET Poll-based Transfer , the receiver is an HTTP client that initiates an HTTP request to an Event Publisher endpoint.
Event Publisher:
A system that issues SETs based on a resource state change that has occurred at a SCIM Service Provider. For example, events may be the result of a SCIM Create, Modify, or Delete operation as defined in . A SCIM Service Provider may be an Event Publisher or an independent service that aggregates events into Event Receiver feeds. As described above, when using , the Event Publisher is an HTTP client that initiates HTTP POST requests to a defined Event Receiver endpoint. When using , the Event Publisher provides an HTTP endpoint, which a receiver may use to "poll" for Security Events.
SCIM Client:
An HTTP client that initiates SCIM protocol requests and receives responses that may cause SCIM Events to be issued by the SCIM Service Provider. A SCIM Client may also be an Event Receiver, typically when making an asynchronous SCIM request (see ).
SCIM Service Provider:
An HTTP server that implements the SCIM protocol and SCIM schema . Upon processing a state change to a SCIM Resource, it issues a SCIM Event or causes an Event Publisher to issue a SCIM Event.
Security Event Token (SET):
As defined in .
SCIM Events A SCIM Event is a signal, in the form of a Security Event Token , that describes some event that has occurred. A SET event consists of a set of standard JWT "top-level" claims and an "events" claim that contains one or more event URI subclaims (JSON attributes) each with a JSON object containing relevant event information. This specification defines the new URI prefix "urn:ietf:params:scim:event", which is used as the prefix for the defined SCIM Events (see ). Events are grouped into one of two sub-namespaces: "feed" (feed control notices) or "prov" (provisioning).
Identifying the Subject of an Event SCIM Events MUST use the "sub_id" claim, defined by , to identify the subject of events. The "sub_id" claim MUST be contained within the main JWT claims body and MUST NOT be located within an event payload within the "events" claim. A SET with multiple event URIs indicates that the events arise from the same transaction or resource state change for a single resource or subject. The JWT "sub" claim MUST NOT be used to identify subjects to prevent confusion with JWT authorization tokens (originally recommended in ).
Example SCIM Subject Id
Instead of "sub", the top-level claim "sub_id" SHALL be used. "sub_id" contains the subclaim attribute "format" set to "scim" to indicate that the attributes present in the "sub_id" object are SCIM attributes. The following "sub_id" attributes are defined:
uri
The SCIM relative path for the resource that usually consists of the resource type endpoint plus the resource "id" (see ), for example, "/Users/2b2f880af6674ac284bae9381673d462". This attribute MUST be provided in a SCIM Event "sub_id" claim. Note that the relative path is the path component after the SCIM Service Provider Base URI as defined in . In cases where the Event Receiver is unable to match a URI, the Event Receiver MAY issue a callback to a previously agreed SCIM Service Provider Base URI plus the relative "uri" value and perform a SCIM GET request per .
externalId
If known, the "externalId" value (defined in ) of the SCIM Resource that MAY be used by a receiver to identify the corresponding resource in the Event Receiver's domain.
id
The SCIM Id attribute (defined in ) MAY be used for backwards compatibility reasons in addition to the "uri" claim.
In cases where SCIM identifiers ("id" and "externalId") are not enough to identify a common resource between an Event Publisher and Event Receiver, the "sub_id" object MAY contain attributes whose SCIM attribute types have "uniqueness" set to "server" or "global" as per . For example, attributes such as "emails" or "username" (defined in ) are unique within a SCIM Service Provider. Such attributes should allow an Event Publisher and Event Receiver to identify a commonly understood subject resource of an event.
Common Event Attributes The following attributes are available for all events defined. Some attributes are defined as SET/JWT claims, while others are "Event Payload" claims as defined in . Only one of the claims, "data" or "attributes", MUST be provided depending on the event definition.
txn
A SET-defined claim with a STRING value (see ) that uniquely identifies a transaction originating at a SCIM Service Provider and/or its underlying data repository or database where one or more SCIM Events may be subsequently issued. In contrast to a "jti" claim (see ), which uniquely identifies a token, the "txn" remains the same when one or more SETs are generated for various purposes such as retransmission, publication to multiple receivers, etc. A distinct state change or transaction within a SCIM Service Provider MAY result in multiple SETs issued each with distinct "jit" values and a common "txn" value. "txn" is REQUIRED to support asynchronous SCIM requests, CP, and replication to disambiguate or detect duplicate SETs regarding the same underlying transaction.
version
The ETag version of the resource as a result of the event. Corresponds to the ETag response header described in .
data
An event payload attribute that contains information described in the SCIM Bulk Operations "data" attribute in . The JSON object contains the equivalent SCIM command processed by the SCIM Service Provider. For example, after processing a SCIM Create operation, the data contained includes the final representation of the entity created by the SCIM Service Provider including the assigned "id" value.
attributes
A payload that contains an array of attributes that were added, revised, or removed. Names of modified attributes SHOULD conform to the ABNF syntax rule for "path" (). For example: "attributes": ["username","emails","name.familyName"].
SCIM Feed Events This section defines events related to changes in the content of an event feed such as SCIM Resources that are being added or removed from an event feed or events used in Co-operative Provisioning scenarios where only a subset of entities are shared across an Event Feed. The URI prefix for these events is "urn:ietf:params:scim:event:feed".
urn:ietf:params:scim:event:feed:add The specified resource has been added to the Event Feed. A "feed:add" does not indicate that a resource is new or has been recently created. For example, an existing user has had a new role (e.g., CRM_User) added to their profile, which has caused their resource to join a feed.
Example SCIM Feed Add Event
urn:ietf:params:scim:event:feed:remove The specified resource has been removed from the feed. Removal does not indicate that the resource was deleted or otherwise deactivated.
Example SCIM Feed Remove Event
SCIM Provisioning Events This section defines resource changes that have occurred within a SCIM Service Provider. These events are used in both Domain-Based Replication (DBR) and Co-operative Provisioning (CP) mode. The URI prefix for these events is "urn:ietf:params:scim:event:prov". When the "data" payload attribute is included for each of the following events, the event URI MUST end with "full"; otherwise, the event URI ends with "notice". In "full" mode, the set of values reflecting the final representation of the resource (such as would be returned in a SCIM protocol response) at the Service Provider are provided using the "data" attribute (see ). In "notice" mode, the "attributes" attribute is returned and lists the set of attributes created or modified in the request (see ). Exactly one of the payload attributes, "data" or "attributes", MUST be present. Both MUST NOT be present simultaneously.
urn:ietf:params:scim:event:prov:create:{notice|full} The specified resource indicates that a new SCIM resource has been created by the SCIM Service Provider and has been added to the Event Feed. Note that because the event may be used for replication, the "id" attribute that was assigned by the SCIM Service Provider is shared so that all replicas in the domain MAY use the same resource identifier.
Example SCIM Create Event (Full)
Example SCIM Create Event (Notice)
The event shown in notifies the Event Receiver of which attributes have changed, but it does not convey the actual information. The Event Receiver MAY retrieve that information by performing a SCIM GET based on the "sub_id" value provided.
urn:ietf:params:scim:event:prov:patch:{notice|full} The specified resource has been updated using SCIM PATCH. In "full" mode, the "data" payload attribute is included (see ). When the event URI ends with "notice", the list of modified attributes is provided (see ).
Example SCIM Patch Event (Full)
Example SCIM Patch Event (Notice)
urn:ietf:params:scim:event:prov:put:{notice|full} The specified resource has been updated (e.g., one or more attributes has changed). In "full" mode, the SCIM PUT request body is included in the "data" attribute (see ). In "notice" mode, the modified attributes are listed using "attributes" (see ).
Example SCIM Put Event (Full)
Example SCIM Put Event (Notice)
urn:ietf:params:scim:event:prov:delete The specified resource has been deleted from the SCIM Service Provider. The resource is also removed from the feed. When a DELETE is sent, a corresponding "feedRemove" SHALL NOT be issued. A delete event has no payload attributes. Note that because the delete event has no attributes, the qualifiers "full" and "notice" SHALL NOT be used.
Example SCIM Delete Event
urn:ietf:params:scim:event:prov:activate The specified resource (e.g., User) has been "activated". This does not necessarily reflect any particular state change at the SCIM Service Provider but may simply indicate that the account defined by the SCIM resource is ready for use as agreed upon by the Event Publisher and Event Receiver. For example, an activated resource can represent an account that may be logged in.
Example SCIM Activate Event
urn:ietf:params:scim:event:prov:deactivate The specified resource (e.g., User) has been deactivated and disabled. The exact meaning SHOULD be agreed to by the Event Publisher and its corresponding Event Receiver. Typically, this means the subject may no longer have an active security session.
Miscellaneous Events This section defines related miscellaneous events such as Asynchronous Request completion that has occurred within a SCIM Service Provider. The URI prefix for these events is "urn:ietf:params:scim:event:misc".
Asynchronous Events
Making an Asynchronous SCIM Request A SCIM Client making SCIM HTTP requests defined in MAY request asynchronous processing using the "Prefer" HTTP header as defined in . The client may do this for a number of reasons such as avoiding holding HTTP connections open during long requests because the result of the request is not needed or the result is delivered to another entity for further action for co-ordination reasons. To initiate an asynchronous SCIM request, a normal SCIM protocol POST, PUT, PATCH, or DELETE request is performed with the HTTP "Prefer" header set to "respond-async" (). The HTTP "Accept" header MUST be ignored for purposes of an asynchronous response. Additionally, per , the "wait" preference SHOULD be supported to establish a maximum time before a SCIM Service Provider MAY choose to respond asynchronously. In response, the SCIM Service Provider returns either a normal SCIM response or HTTP Status 202 (Accepted). The asynchronous response MUST contain no response body. To enable correlation of the future event, the HTTP response header "Set-Txn" (see ) is returned with a value that MUST match the "txn" claim in a subsequent Security Event Token. Per , the response will also include the "Preference-Applied" header. The "Location" header value MUST be one of the following: (a) a URI where the completion SCIM Event Token MAY be retrieved using HTTP GET or (b) the normal SCIM location header response specified by . In the following non-normative example, a "Prefer" header is set to "respond-async":
Example Asynchronous SCIM Protocol Request
The SCIM Service Provider responds with HTTP 202 Accepted and includes the Set-Txn header:
Asynchronous Bulk Endpoint Requests provides the ability to submit multiple SCIM operations in a single "bulk" request. When an asynchronous response is requested, a single Asynchronous Request Completion Event MUST be generated for each requested operation. For example, if a single "bulk" request had 10 operations, then 10 Asynchronous Event completion events would be generated. The "txn" claim MUST be set to the value originally returned to the requesting SCIM Client (see ) appended with a colon ":" and the zero-based array index of the operation expressed in the "Operations" attribute of the original bulk request. The "bulkId" parameter MUST NOT be used for this purpose as it is a temporary identifier and is not required for every operation. For example, if a SCIM Service Provider received a bulk request with two or more operations, and had a "txn" claim value of "2d80e537a3f64622b0347b641ebc8f44", then the first Asynchronous Response Event Token representing the first operation has a "txn" claim value of "2d80e537a3f64622b0347b641ebc8f44:0", the second operation has a value of "2d80e537a3f64622b0347b641ebc8f44:1", and so on. If a SCIM Service Provider optimizes the sequence of operations (per ), the Asynchronous Request Completion events MAY be generated out of sequence from the original request. In this case, the "txn" claims in those events MUST use operation numbers that correspond to the order in the original request.
urn:ietf:params:scim:event:misc:asyncresp The Asynchronous Response event signals the completion of a SCIM request. The event payload contains the attributes defined in and is the same as a single SCIM Bulk Response Operation as per . In the event, the "txn" claim MUST be set to the value originally returned to the requesting SCIM Client (see ).
Example SCIM Asynchronous Response Event
If an error occurs during asynchronous processing, the event operation MUST include a "response" attribute indicating a non-200-series HTTP status as defined in , and that "response" attribute MUST contain the sub-attributes defined in . The "status" attribute of the event operation typically matches the "status" attribute of the response.
Example SCIM Asynchronous Error Response Event
The following four figures show Asynchronous Completion events for the example in .
Example SCIM Asynchronous Response Event Operation (1 of 4)
Example SCIM Asynchronous Response Event Operation (2 of 4)
Example SCIM Asynchronous Response Event Operation (3 of 4)
Example SCIM Asynchronous Response Event Operation (4 of 4)
Set-Txn HTTP Response Header for Asynchronous Requests This specification defines a new HTTP header field, "Set-Txn", which serves the purpose of conveying request completion information to SCIM HTTP clients that request an asynchronous response as described in . The header field MUST be used in SCIM Responses when HTTP Status 202 Accepted is being returned with no message body. The "Set-Txn" HTTP header field value is a unique STRING (e.g., a Globally Unique Identifier (GUID)) used by the SCIM HTTP client to look for a matching SET event with a matching "txn" claim (see ) confirming the request completion status as described in . Intermediaries SHOULD NOT insert, modify, or delete the field's value. SCIM clients MAY ignore the header in cases where confirmation of completion is not required. For example, a SCIM client may simply not want to wait for synchronous completion.
Events Discovery Schema for Service Provider Configuration defines SCIM Service Provider configuration schemas. This section defines additional attributes that enable a SCIM Client to discover the additional capabilities defined by this specification.
securityEvents
A SCIM Complex attribute that specifies the available capabilities related to asynchronous Security Events based on . This attribute is OPTIONAL, and when absent, it indicates the SCIM Service Provider does not support or is not currently configured for Security Events. The following sub-attributes are defined:
asyncRequest
A case-insensitive string value specifying one of the following:
  • "none" indicates that asynchronous SCIM requests defined in are not supported;
  • "long" indicates that the server completes requests asynchronously at the server's discretion (e.g., based on a max wait time); and
  • "request" indicates that the server completes requests asynchronously when requested by the SCIM Client.
eventUris
A multivalued string listing the SET Event URIs (defined in ) that the server is capable of generating and delivering via a SET Stream (see and ). This information is informational only. Stream registration and configuration are out of scope of this specification.
Security Considerations As this specification is based upon the SETs specification and the associated delivery specifications, the following security considerations are also applicable to this specification:
  • (Security Event Token)
  • (Push-Based SET Delivery Using HTTP)
  • (Poll-Based SET Delivery Using HTTP)
SETs may contain sensitive information, including Personally Identifiable Information (PII). In such cases, SET Transmitters and SET Recipients MUST protect the confidentiality of the SET contents in transit using TLS . When co-ordinating provisioning between entities, the long-term series of changes may be critical to the information integrity and recovery requirements of both sides. To address this, Event Publishers can make events available for receivers for longer periods of time than might typically be used for recovering from momentary delivery failures and retries per or . Similarly, Event Receivers MUST ensure events are persisted directly or indirectly to meet local recovery needs before acknowledging the SET Events were received. An attacker might leverage transaction and/or signal information contained in a SET Event Publisher or Receiver system. To mitigate this, access to event recovery and forwarding MUST be limited to the parties needed to support recovery or SET forwarding. When SET Events are transferred in such a way that the Event Publisher is not communicating directly to the Event Receiver, it may become possible for an attacker or other system to insert an event. To mitigate, Event Receivers MUST verify the originator of a SET using JSON Web Signature (JWS) signatures when the Event Publisher is not communicating directly with the Event Receiver. Validating event signatures may also be useful for auditing purposes as signed SET Events are protected from tampering in the event that an intermediate system, such as a TLS-terminating proxy, decrypts the SET payload before sending it onward to its intended recipient. In operation, some SCIM Resources such as SCIM Groups may have a high rate of change. For example, groups with more than a few thousand member values could lead to excessive change rates, which could lead to a loss of SET Events between Event Publishers and Event Receivers. To mitigate this risk, consider the following to help with throughput issues:
  • The use of SCIM PUT (), particularly with large SCIM Groups, can result in excessive data being conveyed in Security Event payloads. Instead, it is RECOMMENDED to use SCIM PATCH () to focus on updating and notifying about changed information. Alternatively, use SCIM PUT Event Notice (urn:ietf:params:scim:event:prov:put:notice) as a trigger to later retrieve the full information when needed.
  • Use SCIM Patch Event Notice (urn:ietf:params:scim:event:prov:patch:notice) to reduce event content combined with periodic SCIM GETs (see ) to retrieve current group state.
  • Aggregate multiple PATCH Events into a single event. Providing the exact date of each membership change is not critical but instead that the information content remains intact.
When using Asynchronous SCIM Requests (see ), a SCIM Service Provider returns a SCIM Accepted response with a URI for retrieving the event result. An unauthorized entity or attacker could obtain asynchronous request completion event information by querying the asynchronous operation result endpoint used by a SCIM Service Provider. To mitigate, the returned URI endpoint MUST be protected and requires an HTTP Authorization header or some other form of client authentication.
Privacy Considerations As this specification is based upon the SET specification and the associated delivery specifications, the following privacy considerations are also applicable to this specification:
  • (Security Event Token)
  • (Push-Based SET Delivery Using HTTP)
  • (Poll-Based SET Delivery Using HTTP)
This specification enables the sharing of information between domains; therefore, it is assumed that implementers and deployers are operating under one of the following scenarios:
  • A common administrative domain where there is one administrative owner of the data. In these cases, the goal is to protect privacy and security of the owner and user data by keeping information systems co-ordinated and up to date. For example, the domains decide to use DBR mode to keep employee information synchronized.
  • In a co-operative or co-ordinated relationship, parties have decided to share a limited amount of data and/or signals for the benefits of their users. Depending on end-user consent, information is shared on an as-authorized and/or as-needed basis. For example, the domains agree to use CP mode that exchanges things such as account status or specific minimal attribute information that must be fetched on request after receiving notice of a change. This enables authorization to be verified each time data is transferred.
In general, the sharing of SCIM Event information falls within a pre-existing SCIM Client and Service Provider relationship and carries no additional personal information.
IANA Considerations
SCIM Asynchronous Set-Txn Header Registration This specification registers the HTTP "Set-Txn" field name in the "Hypertext Transfer Protocol (HTTP) Field Name Registry" defined in .
Field name:
Set-Txn
Status:
permanent
Reference:
See of RFC 9967.
Registering Event Capability with SCIM Service Provider Configuration A reference to of this document has been added to the "urn:ietf:params:scim:schemas:core:2.0:ServiceProviderConfig" entry in the "SCIM Server-Related Schema URIs" registry () under the "System for Cross-domain Identity Management (SCIM) Schema URIs" registry group.
Creation of the SCIM Event URIs Registry IANA has created a new registry called "SCIM Event URIs" under the "System for Cross-domain Identity Management (SCIM) Schema URIs" registry group () at . New registrations for this registry are evaluated by a designated expert(s) for relevance to SCIM-based systems and to avoid possible duplication or conflict with other event definitions that may lie outside SCIM (e.g., Shared Signals ).
Namespace ID:
The sub-namespace ID of "event" is assigned within the "scim" namespace.
Syntactic Structure:
The Namespace Specific String (NSS) of all URNs that use the "event" Namespace ID has the following structure: The keywords have the following meaning:
class
The class of events, which is one of: "feed", "prov", or "misc".
name
A US-ASCII string that conforms to URN syntax requirements (see ) and defines a descriptive event name (e.g., "create").
other
An optional US-ASCII string that conforms to URN syntax requirements (see ) and serves as an additional sub-category or qualifier, for example, "full" and "notice".
Identifier Uniqueness Considerations:
The designated contact is responsible for reviewing and enforcing uniqueness.
Identifier Persistence Considerations:
Once a name has been allocated, it MUST NOT be reallocated for a different purpose. The rules provided for the assignment of values within a sub-namespace MUST be constructed so that the meaning of values cannot change. This registration mechanism is not appropriate for naming values whose meaning may change over time.
Registration Format:
An event registration MUST include the following fields:
  • Event Uri
  • Descriptive name
  • Reference to event definition
Initial Contents of the SCIM Event URIs Registry IANA has added the following initial entries to the "SCIM Event URIs" registry:
Event URI Name Reference
urn:ietf:params:scim:event:feed:add Resource added to Feed Event of RFC 9967
urn:ietf:params:scim:event:feed:remove Remove resource from Feed Event of RFC 9967
urn:ietf:params:scim:event:prov:create: notice New Resource Event (notice only) of RFC 9967
urn:ietf:params:scim:event:prov:create: full New Resource Event (full data) of RFC 9967
urn:ietf:params:scim:event:prov:patch: notice Resource Patch Event (notice only) of RFC 9967
urn:ietf:params:scim:event:prov:patch: full Resource Patch Event (full data) of RFC 9967
urn:ietf:params:scim:event:prov:put: notice Resource Put Event (notice only) of RFC 9967
urn:ietf:params:scim:event:prov:put:full Resource Put Event (full data) of RFC 9967
urn:ietf:params:scim:event:prov:delete Resource Deleted Event of RFC 9967
urn:ietf:params:scim:event:prov:activate Resource Activated Event of RFC 9967
urn:ietf:params:scim:event:prov:deactivate Resource Deactivated Event of RFC 9967
urn:ietf:params:scim:event:misc:asyncresp Asynchronous Request Completion of RFC 9967
References Normative References Informative References SCIM Event Extension Oracle Google Cisco OpenID Shared Signals Framework Specification 1.0
Use Cases SCIM Events may be used in a number of ways. The following non-normative sections describe some of the expected uses.
Domain-Based Replication The objective of DBR events is to synchronize resource changes between SCIM Service Providers in a common administrative domain. In this mode, complete information about modified resources are shared between replicas for immediate processing.
Domain-Based Replication Sequence id=xyz | v +----------------+ | Update local | | node [4] | +----------------+]]> Client A SCIM Service Provider Service Provider Replica [1] SCIM Operation [2] SCIM Response [3] Event SCIM:prov:<op> id:xyz [4] Update local node
From a security perspective, it is assumed that servers sharing DBR events are secured by a common access policy and all servers are required to be up to date. From a privacy perspective, because all servers are in the same administrative domain, the primary objective is to keep individual Service Provider nodes or clusters synchronized.
Co-ordinated Provisioning In CP, SCIM resource change events perform the function of change notification without the need to provide raw data. In any Event Publisher and Receiver relationship, the set of SCIM Resources (e.g., Users) that are linked or co-ordinated is managed within the context of an event feed and may be a subset of the total set of resources on either side. For example, an event feed could be limited to users who have consented to the sharing of information between domains. To support capability, "feed" specific events are defined to indicate the addition and removal of SCIM Resources from a feed. For example, when a user consents to the sharing of information between domains, events about the User may be added to the feed between the Event Publisher and Receiver.
Co-ordinated Provisioning Sequence | | | |<-----------------+ "SCIM Response" | | | | | | | |--> "Event SCIM:prov:, id=xyz" --->| | | | | | | | Note: Receiver | | | | may accumulate | | | | events for | | | | periodic action | | |<------------------+ "SCIM GET " | | |------------------>| "Filtered | | | | Resource Resp." | | | | | | | +------------------>| | | | "Co-ord Action" | | | | | ]]> SCIM Client SCIM Service Provider Client A Co-op Receiver Co-op Action Endpoint loop [1] SCIM Operation [2] SCIM Response [3] Event SCIM:prov:<op> id:xyz [4] SCIM GET <id> [5] Filtered Resource Response [6] Co-ordinated Action Receiver may accumulate events for periodic action.
In CP mode, the receiver of an event must call back to the originating SCIM Service Provider (e.g., using a SCIM GET request) to reconcile the newly changed resource in order to obtain the changes. CP has the following benefits:
  • Differences in schema (e.g., attributes) between domains. For example, a receiving domain may only be interested in or allowed to access to a few attributes (e.g., role-based access data) to enable access to an application.
  • Different Event Receivers may have differing needs when accessing information and thus may be assigned varying access rights. Minimal information events combined with callbacks for data allows data filtering to be applied.
  • Receivers can take independent action such as deciding which attributes or resource life cycle changes to accept. For example, in the case of a conflict, a receiver can prioritize one domain source over another.
  • A receiver may throttle or buffer changes rather than act immediately on a notification. For example, for a frequently changing resource, the receiver may choose to make a scheduled SCIM GET for resources that have been marked "dirty" by events received in the last scheduled cycle.
A disadvantage of the CP approach is that it may be considered costly in the sense that each event received might trigger a callback to the event issuer. This cost should be weighed against the cost producing filtered information in each event for each receiver. Furthermore, a receiver is not required to make a callback on every provisioning event. It is assumed that an underlying relationship between domains exists that permits the exchange of personal information and credentials. For example, in a cross-domain scenario, a SCIM Service Provider would have been previously authorized to perform SCIM provisioning operations and publish change events. As such, appropriate confidentiality and privacy agreements should be in place between the domains. When sharing information between parties, CP Events minimize the information shared in each message and require the Security Event Receiver to receive more information from the Event Publisher as needed. In this way, the Event Receiver is able to have regular access to information through normal SCIM protocol access restrictions. The Event Receiver and Publisher may agree to communicate these updates through a variety of transmission methods such as push- and pull-based HTTP or HTTP GET (see ); streaming technologies (e.g., Kafka or Kinesis); or webhooks such as in the Shared Signals Framework.
Acknowledgements The authors would like to thank the following contributors:
  • and , who contributed significantly to upon which this document is based.
  • The participants of the SCIM Working Group and the IETF id-event mailing list for their support of this specification.
  • , , , , , , , , , , , , , , and for their write-ups and reviews.