Revision Hist=
ory
Copyright
Copyright © =
2002 WS-I Organization. No p=
art of
this document may be reproduced without the permission of WS-I Organization=
.
Confidentiali=
ty
This document contains proprietary information that is
confidential and shall not be made available to unauthorized persons.
WS-I Usage
Scenarios define the use of Web services in structured interactions, identifying
basic interoperability requirements for such interactions and mapping the f=
low
of a scenario to the requirements of the WS-I Basic Profile 1.0 (hereafter,
Basic Profile) [1]. Scenarios =
are
independent of any application domain. WS-I Use Cases employ Scenarios to m=
odel
high-level definitions of specific applications.
The scenarios presented here can be composed or extended. That is, t=
hey
describe fundamental Web service design patterns that can be combined and b=
uilt
upon like building blocks. For example, the Synchronous Request/Response
scenario describes a basic exchange and can be expanded by adding SOAP head=
ers.
The only requirement is that the extensions must also conform to the Basic
Profile.
This docume=
nt
describes the WS-I Usage Scenarios to be used with the Basic Profile. The B=
asic
Profile constraints and requirements are referenced directly and the reader=
is
expected to use the Basic Profile in conjunction with this document to inte=
rpret
the referenced information.
The three scenarios presented in this document are int=
ended
to provide sufficient information so that a user of this document can create
WS-I compliant Web service applications using one of more of the scenarios.=
All
applicable guidelines and restrictions for the messages and service descrip=
tion
instances for each scenario are provided.
The Usage Scenario taxonomy defines a structure for ap=
plying
the Basic Profile constraints. The taxonomy consists of a Web services stack
and a set of activities, grouped by the layers of the stack, that a Web ser=
vice
instance executes as part of the Web service Usage Scenario. The constraint=
s of
the Basic Profile are applied to each activity as well as to the optional c=
omponents
of the scenario, e.g., the WSDL for the description of the Web service
instance. There are two types of constraints on scenarios:
- Flow Constraints applying to each activity that t=
akes
part in the flow of the Web service. These include: expressing the Web
service data model in XML, creating and consuming messages using SOAP,
transporting messages using HTTP
- Description Constraints applying to the description of the Scenario.
Operationally, the description of a Web service instance occurs in WSDL
and possibly UDDI, therefore, these constraints are applied to the WSDL
and UDDI describing the Scenario.
The following are attributes of WS-I Usage Scenarios:<=
/p>
- They include a flow description, linking together=
the
set of activities specific to the scenario,
- They include optional components, such as SOAP
headers or security,
- They are described with a WSDL document,
- Each activity within a scenario has constraints
applied to it by the Basic Profile, and
- They represent a real-world Web service
implementation.
The Usage Scenario taxonomy is based on a Web services
stack. Each layer of the stack represents one of the fundamental functional
areas of a Web service instance. Not all possible functional areas are
represented (e.g., security or coordination), only the most basic. These la=
yers
are depicted in the following diagram.
 =
;
=
Figure 2‑1 Web services stack
A Web service application may include several logical =
layers
incorporating functions such as the Web service instance and application
business logic. The Bas=
ic
Profile and Usage Scenarios do not address application business logic except
where the functionality of any part of the Web services stack is implemented
within the business logic.
The details of each layer of the Web service stack are=
:
Data Layer
The data layer translates the application specific dat=
a into
the model chosen for the specific Web service. The data layer includes the
functions necessary to support flexible data typing. This layer maps to the=
wsdl:types and wsdl:message definitions within a WSDL document.
SOAP Message Layer=
o:p>
The SOAP message layer is the infrastructure that proc=
esses
SOAP messages, dispatches them, and may optionally fulfill Quality of Servi=
ce
requirements. On the sending side the message layer writes SOAP messages, b=
ased
on the data model defined in portTypes and bindings. On the receiving side =
the
message layer processes the SOAP messages and dispatches requests to the
correct application or method.
Transport Layer
The transport layer sends and receives messages. For t=
he
Basic Profile, this includes only HTTP client and server platforms. This la=
yer
maps to the wsdl:binding and wsdl:port definitions with the WSDL do=
cument.
A set of activities is defined for each layer of the W=
eb
service stack. Activities are the fundamental operations that comprise a Web
service. A single activity has several constraints applied to it from the B=
asic
Profile. For example, one act=
ivity
might be “Send HTTP” and the specifications and guidelines for =
how
to fulfill that activity come from the SOAP 1.1 and HTTP sections of the Ba=
sic
Profile.
The following table summarizes these activities.
Layer=
|
Activity
|
Data Layer
|
Write XML
Process XML
|
SOAP Message Layer
|
Write SOAP envelope
Process SOAP envelope
Write SOAP body
Process SOAP body
Write SOAP header
Process SOAP header
|
Transport Layer
|
Send HTTP
Receive HTTP
|
Table 1
- Activities grouped by Web services stack layer
The following activities are part of the Data layer:=
p>
Write XML
Application-level messages that are to be exchanged du=
ring a
Web services interaction must be written to a serialized form that can be
transported with the underlying transport protocol. These messages use the =
data
types and formats declared in the data model documentation (i.e., WSDL or
Schema). Writing the message =
data
is the responsibility of the application component sending a message to a
recipient.
Process XML
Application-level messages that are exchanged in a Web
services interaction are passed to application components responsible for
receiving, interpreting and acting upon the received messages. Application components process mes=
sage
data according to the types and formats declared in the data model
documentation.
The following activities are executed with the SOAP Me=
ssage
Layer.
SOAP envelope<=
/span>
The SOAP envelope is the container for all the ot=
her
SOAP message parts, including the payload.
- Write SOAP envelope=
- Process SOAP envelope
SOAP body
The SOAP body is used for transporting application-spe=
cific
information included in the application message data. The activities in this
layer are different from the data payload writing and processing activities
described in the Data Layer activities section.
SOAP header
The SOAP header provides a modular mechanism for exten=
ding a
SOAP message.
- Write SOAP header=
li>
- Process SOAP header=
SOAP messages may be sent using the HTTP or HTTPS tran=
sport
protocols.
In WS-I Web services scenarios there are two high level
actors. These are not related to SOAP Actors as defined in SOAP 1.1.
Consumer
A Consumer is responsible for making requests of a ser=
vice
implemented by a Provider.
Provider
A Provider is responsible for listening for and proces=
sing
Consumer service requests.
2.3 Security
Usage scenarios do not explicitly address authenticati=
on,
authorization, identification, or privacy. However, some of those concerns =
can
be addressed with existing technologies that are compatible with the Basic
Profile. For example, the HTTPS binding can be used rather than the
un-encrypted HTTP binding. Application level security can always be added
within the message layer and this would be entirely transparent to the Basic
Profile.
Countermeasures are best applied through a risk assess=
ment
of your Web service application. To assist in this process please see the
Security Appendix below for more detailed information on common threats and
Basic Profile compliant mitigation strategies. Each Usage Scenario includes=
a
section detailing additional concerns as well as the identified common thre=
ats
most relevant to the given scenario.
3&nb=
sp;
Usage
Scenarios
This section defines the three Usage Scenarios develop=
ed to
complement the Basic Profile:
- One-way
- Synchronous request/response
- Basic callback
A Consumer sends a request message to a Provider. The Provider receives the me=
ssage
and processes it.
The exchange is one way; no SOAP response message from=
the
Provider is generated or expected.
The underlying transport is not required to guarantee delivery of the
message to the Provider. Rega=
rdless
of the protocol implemented by the transport layer, the Consumer receives no
acknowledgement above the transport layer that the message was successfully
sent, delivered to the intended destination, or received by the Provider.=
p>
This Scenario applies to situations where information =
loss
is inconsequential (for example, in a status monitoring scenario where peri=
odic
status update events are provided such that if one update event is lost, a
subsequent update event will convey correct status).

Figure 3‑1 One-way Sequence
High-level flow:
- Consumer invokes the service by s=
ending
a SOAP message bound to an HTTP request to the Provider
- Provider executes the service.
Assumptions:=
span>
- This scenario describes a runtime sequence of eve=
nts;
it does not describe the design or deployment activities.
- The data model, the application semantics, and the
transport bindings are all agreed upon and implemented a priori to this
scenario.
- All parts of this scenario are defined in conform=
ance
with the guidelines and recommendations of the Basic Profile.
- This scenario is “composable”, that i=
s,
it may be used as a foundation for creating more complex scenarios.
3.1.2
Flow
The detailed flow for this scenario, using the activit=
ies
defined in Section 2.2, is described below. Each bulleted item represents
the activities performed within one layer of the stack required to complete=
the
flow. The order of activities within a Consumer or Provider is not signific=
ant.
Each activity has constraints imposed upon it from the Basic Profile.

Figure 3‑2 One-way Request
The Consumer initiates a SOAP request:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- Write SOAP body
- Transport Layer
The Provider receives the SOAP request:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- Process SOAP body
- Data Layer
- Process XML. The data payload is processed
according to the data model and dispatched to the application

Figure 3‑3 One-way Acknowledgement
The Provider sends the acknowledgement:
- Transport Layer
- Send HTTP. Note that the HTTP response can be s=
ent
at any time relative to the processing of the SOAP message. There is =
no
SOAP envelope sent with the HTTP response.
The Consumer receives the acknowledgement:
- Transport Layer
- Receive HTTP (status code). This is ignored by =
the
higher layers of the Web services stack.
3.1.3
Flow
Constraints
The following are the flow constraints upon this Usage
Scenario.
- Write XML, as defined in Section 5.1
- Write SOAP envelope, as define in Section =
span>5.3
- Write SOAP body, as define in Section 5.5
- Send HTTP, as defined in Section 5.9. Further constraint specific to this scenario is R2714.
- Receive HTTP, as defined in Section <=
/span>5.10. Further constraints specific to this scenario are R2715, R2727,
and R2750.
- Process SOAP envelope, as defined in Section=
5.4
- Process SOAP body, as defined in Section 5.6
- Process XML, as defined in Section =
span>5.2
A SOAP Fault cannot be generated in this scenario since
there is no SOAP response message. If any error occurs in the Provider, the
Provider and Consumer must respectively abide by constraints R2714 and R271=
5.
3.1.3.2 SOAP
Headers
Use of a SOAP header is optional for this scenari=
o.
If it is used, it must follow the constraints for the Write SOAP Header and
Process SOAP Header activities, as defined in Section 5.7
and 5.8,
respectively.
The WSDL should have at least the following content wi=
thin
its definitions for the One-way Scenario. Not all sections are required, bu=
t if
present in the WSDL, each should follow the guidelines as presented below.
General constraints on the WSDL are described in Section 5.11. Other constraints imposed upon the WSDL by the B=
asic
Profile are listed below.
3.1.4.1 types
This section is not required and if present, will be
dependent upon the specifics of the data model.
Constraints on WSDL types are listed in Section <=
/span>5.12.
3.1.4.2 messages
Message format will be dependent upon the data model
(doc/literal or rpc/literal). Only one message is defined: one input.
3.1.4.2.1 Docu=
ment
messages
Document messages parts are composed from Schema eleme=
nt
definitions (see R2204)
<wsdl:message …>=
o:p>
&nb=
sp; =
<wsdl:part
name=3D”Input” element=3D”..”>=
</wsdl:message>
3.1.4.2.2 RPC
messages
RPC messages parts are composed from Schema type
declarations (see R2203)
<wsdl:message …>=
o:p>
&nb=
sp; =
<wsdl:part
name=3D”Input“ type=3D”..” /><=
/p>
</wsdl:message>
Other constraints are listed in Section =
span>5.13.
3.1.4.3 portTypes
The one-way transmission primitive must be used. Gramm=
ar is:
<wsdl:portType ..>=
<wsdl=
:operation
…>
&nb=
sp; =
&nb=
sp; <wsdl:input
…/>
&nb=
sp; =
</wsdl:operation>
</wsdl:portType>=
span>
Other constraints are listed in Section =
span>5.14.
3.1.4.4 binding
The wsdl:bin=
ding
section must use the SOAP binding extension with HTTP transport. The same
operation type defined in wsdl:po=
rtType
must be used in the binding section.
<wsdl:binding …>
&=
nbsp; <soap:binding
style=3D”rpc|document” transport=3Dhttp://schemas.xmlsoap.org/so=
ap/http>
&nb=
sp; <wsdl:input
…>
&nb=
sp; </wsdl:input&=
gt;
&nb=
sp; </soap:binding>
</wsdl:binding>
Other constraints are listed in Section =
span>5.15.
3.1.4=
.5 port
The soap:add=
ress
element must be specified along with the URL for the endpoint:
<wsdl:port>
&nb=
sp; <soap:address
location=3D”uri” />
</wsdl:port>
Other constraints are listed in Section =
span>5.16.
Advertisement of Web services patterned after this sce=
nario
adheres to the “Using
WSDL in a UDDI Registry, Version 1.07” Best Practice document. A uddi:tModel
representing the Web service type references the file containing the wsdl:binding for the message
operation. The uddi:bindingTemplate captures the
service endpoint and references the http://www.uddi.org/pubs/ProgrammersAPI-V2.04-Published-20020719.pdf<=
/a>). These include the browse pattern, =
the
drill-down pattern and the invocation pattern.
General UDDI Constraints are listed in Section =
span>5.17.
This section identifies the threats most relevant to t=
his
Usage Scenario as described in Appendix 1 where additional information on B=
asic
Profile compliant countermeasures may also be found.
Additional constraints may apply if HTTPS is used to
implement security. These are Profile requirements: R5000, R5001, R5010, .<=
span
style=3D'mso-spacerun:yes'> Appendix 1 has additional guidelin=
es on
Security.
As of this writing no specific threat has been identif=
ied as
being singularly relevant to this Usage Scenario.
3.2 Synchronous Request/Response
A Consumer sends a request message to a Provider. The Provider receives the message,
processes it, and sends back a response.
The following diagram shows the high-level interactions
between a Consumer and a Provider in the Synchronous Request/Response Usage
Scenario.

Figure=
3‑4 Synchronous Request/Response Sequ=
ence
High-level
flow=
:
1. Consumer invokes the service by sendin=
g a
SOAP message bound to an HTTP request to the Provider
2. Provider executes the service and send=
s a
SOAP message bound to an HTTP response to the Consumer
Assumptions:=
span>
- This scenario is a runtime sequence of events; it
does not involve any design or deployment activities.
- The data model, the application semantics, and the
transport bindings are all agreed upon and implemented a priori to this
scenario.
- This scenario is “composable”, that i=
s,
it may be used as a foundation for creating more complex scenarios.
- The Request and Response messages are synchronized
through the HTTP transport.
The detailed flow for this scenario, using the activit=
ies
defined in Section 2.2, is described below. Each bulleted item represents
the activities performed within one layer of the stack required to complete=
the
flow. The order of activities within a Consumer or Provider is not signific=
ant.
Each activity has constraints imposed upon it from the Basic Profile.

Figure 3‑5 Synchronous Request
The Consumer initiates a SOAP request:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- Write SOAP body
- Transport Layer
The Provider receives the SOAP request:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- Process SOAP body
- Data Layer
- Process XML.&n=
bsp;
The data payload is processed according to the data model and
dispatched to the application

Figure 3‑6 Synchronous Response
The Provider generates a SOAP response:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- Write SOAP body
- Transport Layer
The Consumer receives the SOAP response:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- Process SOAP body
- Data Layer
- Process XML.&n=
bsp;
The data payload is processed according to the data model and
dispatched to the application
3.2.3
Flow Constraints
The following activities have the referenced constrain=
ts in
this Usage Scenario.
- Write XML, as defined in Section 5.1
- Write SOAP envelope, as defined in section <=
/span>5.3
- Write SOAP body, as define in Section 5.5
- Send HTTP, as defined in Section 5.9
- Receive HTTP, as defined in Section <=
/span>5.10
- Process SOAP envelope, as defined in Section=
5.4
- Process SOAP body, as defined in Section 5.6
- Process XML, as defined in Section =
span>5.2
Errors that occur during SOAP processing are communica=
ted
with a SOAP Fault message, as per the SOAP 1.1 specification. This scenario
supports SOAP Faults through composition, that is, all the constraints
described in sections 3.2.3 and 3.3.4.1 apply, plus the additional constraints imposed up=
on
the following Activities.
The Web service Provider must abide by the following
restrictions and guidelines from the Basic Profile:
- Behavior for fault generation: R2724, R2725
- Writing the soap:fault:
R1000, R1001, R1004, R1031, R2742, R2743
- HTTP SOAPAction:=
R1119
- Requirements for WSDL description: R2728, R2742,
R2743, R2754
The Web service Consumer must follow the following
restrictions and guidelines from the Basic Profile:
- Processing the soap:fault: R1002, R1003, R1016
3.2.3.2 SOAP
Headers
Use of a SOAP header is optional for this scenari=
o.
If it is used, it must follow the constraints for the Write SOAP Header and=
Process
SOAP Header activities, as defined in Sections 5.7
and 5.8,
respectively.
The WSDL should have at least the following content wi=
thin
its definitions for the Synchronous Request/Response Scenario. Not all sect=
ions
are required, but if present in the WSDL, each should follow the guidelines=
as
presented below. General constraints on the WSDL are described in Section <=
span
style=3D'mso-field-code:" REF _Ref24415586 \\r \\h "'>5.11. Other constraints imposed upon the WSDL by the B=
asic
Profile are listed below.
3.2.4.1 types
This WSDL section is not required, and if present, wil=
l be
dependent upon the specifics of the data model.
Constraints on types are listed in Section 5.12.
3.2.4.2 messages
Message format will be dependent upon the data model
(doc/literal or rpc/literal). At least two messages must be defined: one in=
put
and one output. Optionally, a fault message may also be defined.
3.2.4.2.1 Docu=
ment
messages
Document message parts are composed from Schema element
definitions (see R2204)
<wsdl:message …>=
o:p>
&nb=
sp; =
<wsdl:part
name=3D”..” element=3D”..”>
&nb=
sp; =
<wsdl:part
name=3D”..” element=3D”..”/>=
p>
</wsdl:message>
3.2.4.2.2 RPC
messages
RPC message parts are composed from Schema type declar=
ations
(see R2203)
<wsdl:message …>=
o:p>
&nb=
sp; =
<wsdl:part
name=3D” “ type=3D”..” />
&nb=
sp; =
<wsdl:part
name=3D” “ type=3D”..”/>
</wsdl:message>
Constraints on messages are listed in Section 5.13.
3.2.4.3 portTypes
The request/response transmission primitive must be us=
ed.
Grammar is:
<wsdl:portType ..>=
<wsdl=
:operation
…>
&nb=
sp; =
&nb=
sp; <wsdl:input
…/>
&nb=
sp; =
&nb=
sp; <wsdl:output
…/>
&nb=
sp; =
</wsdl:operation>
</wsdl:portType>=
span>
Constraints on portTypes are listed in Section =
span>5.14.
3.2.4.4 binding
The wsdl:bin=
ding
section must use the SOAP binding extension with HTTP transport. The same
operation defined in wsdl:portTyp=
e
must be used in the binding section.
<wsdl:binding …>
&=
nbsp; <soap:binding
style=3D”rpc|document” transport=3Dhttp://schemas.xmlsoap.org/so=
ap/http>
&nb=
sp; <wsdl:input
…>
&nb=
sp; </wsdl:input&=
gt;
&nb=
sp; <wsdl:output
…>
&nb=
sp; </wsdl:output=
>
&nb=
sp; </soap:binding>
</wsdl:binding>
Constraints on bindings are listed in Section 5.15.
3.2.4.5 port
The soap:add=
ress
element must be specified along with the URL for the endpoint:
<wsdl:port>
&nb=
sp; <soap:address
location=3D”uri” />
</wsdl:port>
Constraints on port definitions are listed in Sec=
tion
5.16.
Advertisement of Web services patterned after this sce=
nario
adheres to the “Using
WSDL in a UDDI Registry, Version 1.07” Best Practice document. A uddi:tModel
representing the Web service type references the file containing the
wsdl:binding for the synchronous message operation(s). The uddi:bindingTemplate
captures the service endpoint and references the uddi:tModel(s)
for the Web service type.
Advertising Web services in this way e=
nables
discovery using the inquiry patterns supported by the UDDI Inquiry API set =
(see
http://www.uddi.org/pubs/ProgrammersAPI-V2.04-Published-20020719.pdf). These include the browse pattern, =
the
drill-down pattern and the invocation pattern.
General UDDI Constraints are listed in Section =
span>5.17.
3.2.6
Security
This section identifies the threats most relevant to t=
his
Usage Scenario as described in Appendix 1 where additional information on B=
asic
Profile compliant countermeasures may also be found.
Additional constraints may apply if HTTPS is used to
implement security. These are Basic Profile requirements: R5000, R5001,
R5010. Appendix 1 has additio=
nal
guidelines on Security.
As of this writing no specific threat has been identif=
ied as
being singularly relevant to this Usage Scenario.
3.3 Basic Callback
The Basic Callback scenario facilitates a form of
asynchronous message exchange for Web services. This is accomplished through
the composition of two synchronous request/response pairs. The messages are
related via correlation information that is provided by the Consumer. The
Consumer also provides the endpoint information for the callback service
location to the Provider. The
definition of the callback service is defined by the Provider in the publis=
hed
Web service description and implemented by the Consumer.
At runtime a Consumer sends the initial SOAP request i=
n a
request/response sequence to the Provider, which in turn sends back an
immediate acknowledgement of receipt. At a later point in time the Provider
will initiate the final request/response sequence to the Consumer containing
the response data for the initial request sent by the Consumer. The following diagram shows the
high-level interactions between a Consumer and a Provider in the Basic Call=
back
Usage Scenario.

Figure 3‑7 Basic Callback Sequence
High-level flow:
- Consum=
er
initiates the service by sending a SOAP message bound to an HTTP reque=
st
to the Provider (the “initial request”)<=
/li>
- Provid=
er
acknowledges receipt via a SOAP message bound to an HTTP response to t=
he
Consumer (the “initial response”)
- Provid=
er
completes the exchange by sending a SOAP message bound to an HTTP requ=
est
to the Consumer with the results of the initial request (the “fi=
nal
request” or “callback”)
- Consum=
er
acknowledges receipt of the callback message with a SOAP message bound=
to
an HTTP response (the “final response”)<=
/li>
Assumptions:=
span>
- This scenario is a runtime sequence of events; it
does not involve any design or deployment activities.
- The data model, the application semantics, the
callback correlation mechanism, and the transport bindings are all agr=
eed
upon and implemented a priori to this scenario.
- All parts of this scenario are defined in conform=
ance
with the guidelines and recommendations of the Basic Profile.
- This scenario is “composable”, that i=
s,
it may be used as a foundation for creating more complex scenarios.
The Basic Callback scenario is built upon two correlat=
ed
synchronous request/response interactions. Since a Consumer and a Provider =
may
have many outstanding requests, there needs to be a mechanism for each part=
y to
unambiguously identify which callback goes with which initial request. This=
can
be achieved using some business data in the SOAP payload, such as a purchase
order number, that can be used to correlate the callback with the request, =
or
through using some form of message id.
In order to invoke the callback service, the Consumer =
must
communicate the callback endpoint to the Provider. This can be conveyed at runtime in=
the
initial SOAP message sent by the Consumer to the Provider, during deploymen=
t,
or using a discovery mechanism agreed to by both parties.
The Web service description for both the initial and f=
inal
request/response pairs (i.e., portTypes) may be defined in a single WSDL
document. Although it is not a requirement to do so, placing them in the sa=
me
document will communicate the contract and the expectations on the client m=
ore
effectively. In loosely coupled situations where two businesses may not wan=
t to
maintain a single document, the initial and final request/response pairs sh=
ould
be described in separate WSDL documents.&n=
bsp;
In either case, portTypes for both the Provider and Consumer Web
services shall be defined. The description MAY contain ports for the Provid=
er
Web services, and DOES NOT contain defined ports for the Consumer Web servi=
ces.
Since the final service address is not known beforehand, a WSDL port cannot=
be
defined for the final request/response portType. It is, instead communicate=
d by
the Consumer as described above.
The detailed flow for this scenario, using the activit=
ies
defined in Section 2.2, is described below. Each bulleted item represents
the activities performed within one layer of the stack required to complete=
the
flow. The order of activities within a Consumer or Provider is not signific=
ant.
Each activity has constraints imposed upon it from the Basic Profile.

Figure 3‑8 Basic Callback Consumer Request=
The Consumer initiates a SOAP request:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- [Write SOAP header (if correlation information =
is
conveyed in this manner)]
- Write SOAP body
- Transport Layer
The Provider receives the initial SOAP request:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- [Process SOAP header (if correlation informatio=
n is
conveyed in this manner)]
- Process SOAP body
- Data Layer
- Process XML. The data payload is
processed according to the data model and dispatched to the applicati=
on

Figure 3‑9 Basic Callback Provider Acknowledgemen=
t
The Provider generates the acknowledgement (response)
message:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- Write SOAP body
- Transport Layer
The Consumer receives the acknowledgement (response)
message:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- Process SOAP body
- Data Layer
- Process XML. The data payload is processed
according to the data model and dispatched to the application

Figure 3‑10 Basic Callback Provider Response
The Provider initiates a SOAP request:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- [Write SOAP header (if correlation information =
is
conveyed in this manner)]
- Write SOAP body
- Transport Layer
The Consumer receives the SOAP request:
- Transport Layer
- SOAP Message Layer
- [Process SOAP header (if correlation informatio=
n is
conveyed in this manner)]
- Data Layer
- Process XML. The data payload is processed
according to the data model and dispatched to the application

Figure 3‑11 Basic Callback Consumer Acknowledgemen=
t
The Consumer then generates the acknowledgement (respo=
nse)
message:
- Data Layer
- Write XML.&nbs=
p;
The payload is created according to the data model.
- SOAP Message Layer
- Write SOAP envelope
- Write SOAP body
- Transport Layer
The Provider receives the SOAP acknowledgement (respon=
se)
message:
- Transport Layer
- SOAP Message Layer
- Process SOAP envelope
- Process SOAP body
- Data Layer
- Process XML. The data payload is processed
according to the data model and dispatched to the application
The following activities have the referenced constrain=
ts in
this Usage Scenario.
- Write XML, as defined in Section 5.1
- Write SOAP envelope, as defined in Section <=
/span>5.3
- [Write SOAP header (when correlation informa=
tion
is conveyed in a SOAP header)], as defined in Section REF _Ref24438919 \r \h =
5.7
- Write SOAP body, as define in Section 5.5
- Send HTTP, as defined in Section 5.9
- Receive HTTP, as defined in Section <=
/span>5.10
- Process SOAP envelope, as defined in Section=
5.4
- [Process SOAP header (when correlation
information is conveyed in a SOAP header)], as defined in Section 5.8
- Process SOAP body, as defined in Section 5.6
- Process XML, as defined in Section =
span>5.2
Constraints =
for Fault
generation and behavior as described in the Synchronous Request / Response
Scenario 3.2.3.=
1 also apply to this scenario.
For the Basic Callback scenario, the WSDL must have at=
least
the following content within its definitions. Not all sections are required,
but if present in the WSDL, each should follow the guidelines as presented
below. The WSDL defined below is contained within a single document, and
describes both the Initial and the Final request/response sequences of the
Basic Callback. Constraints imposed upon the WSDL by the Basic Profile are =
also
listed.
General constraints on the WSDL are described in Secti=
on 5.11. Other constraints imposed upon the WSDL by the B=
asic
Profile are listed below.
3.3.5.1 types
Application Data
This section will be dependent upon the specifics of t=
he
data model and often contains correlation information in addition to
application data types.
3.3.5.2 messages
Message format will be dependent upon the data model
(doc/literal or rpc/literal). The following messages and parts are typically
defined for this Usage Scenario:
- Initial request message
- Initial response message
- Final request message
- Final response message
3.3.5.2.1 Docu=
ment
and RPC style
Below are some general issues concerning differences b=
etween
Document and RPC style messages. For simplicity all required messages for t=
his
scenario have been defined as Document style, but this is not a requirement=
.
Document messages
Document message parts are composed from Schema element
definitions (see R2204)
<wsdl:message …>
&nb=
sp; <wsdl:part
name=3D”InitialRequest” element=3D”..”>
</wsdl:message>
RPC messages=
span>
RPC message parts are composed from Schema type declar=
ations
(see R2203)
However, parts to be used in SOAP headers or faults MU=
ST be
defined as elements
<wsdl:message …>
&nb=
sp; <wsdl:part
name=3D”InitialRequest“ type=3D”..” />
</wsdl:message>
Constraints on messages are listed in Section =
5.13.
3.3.5.3 portTypes
The request/response transmission primitive must be us=
ed for
both the Initial and Final sequences.
3.3.5.3.1 Prov=
ider
<wsdl:portType name=3D"ProviderPortType">=
p>
&nb=
sp; <wsdl:operation
name=3D"…">
&nb=
sp; <wsdl:input=
8230;
&nb=
sp; </wsdl:input&=
gt;
&nb=
sp; <wsdl:output&=
#8230;
&nb=
sp; </wsdl:output=
>
&nb=
sp; </wsdl:operation>
</wsdl:portType>
3.3.5.3.2 Cons=
umer
<wsdl:portType name=3D"ConsumerPortType">=
p>
&nb=
sp; <wsdl:operation
name=3D"…">
&nb=
sp; <wsdl:input=
8230;
&nb=
sp; </wsdl:input&=
gt;
&nb=
sp; <wsdl:output&=
#8230;
&nb=
sp; </wsdl:input&=
gt;
&nb=
sp; </wsdl:operation>
</wsdl:portType>
Constraints on portTypes are listed in Section =
span>5.14.
3.3.5.4 binding
The wsdl:bin=
ding
section must use the SOAP binding extension with HTTP transport. The same
operation defined in wsdl:portTyp=
e
must be used in the binding section. Two bindings will be defined, one for =
the
Initial sequence, one for the Final.
3.3.5.4.1 Prov=
ider
<wsdl:binding name=3D"ProviderSoapBinding"
type=3D"tns:ProviderPortType">
<soap:binding style=3D"document|rpc"
transport=3D"http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name=3D"…">
&nb=
sp; <soap:operation/>
&nb=
sp; <wsdl:input…
&nb=
sp; </wsdl:input>
&nb=
sp; <wsdl:output…
&nb=
sp; </wsdl:output>
</wsdl:operation>
</wsdl:binding>
3.3.5.4.2 Cons=
umer
<wsdl:binding name=3D"ConsumerSoapBinding"
type=3D"tns:ConsumerPortType">
<soap:binding style=3D"document|rpc"
transport=3D"http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name=3D"submitFinalReq">
&nb=
sp; <soap:operation/>
&nb=
sp; <wsdl:input…
&nb=
sp; </wsdl:input>
&nb=
sp; <wsdl:output…
&nb=
sp; </wsdl:output>
</wsdl:operation>
</wsdl:binding>
Constraints on bindings are listed in Section 5.15.
3.3.5.5 port
Only one port will be defined: that for the Initial
Request/Response. The Final sequence has an unspecified port-binding. The <=
span
style=3D'font-family:"Courier New"'>soap:address element must be spe=
cified
along with the URL for the endpoint:
<wsdl:port>
&nb=
sp; <soap:address
location=3D”uri” />
</wsdl:port>
Constraints on port definitions are listed in Sec=
tion
5.16.
There are two Web service implementations involved in =
this
Usage Scenario, but only the Initial Web service is advertised in UDDI. The Final Web service is not disco=
verable
because the callback endpoint must be known to and accessible by the initia=
tor
of the Initial request.
Communicating the callback endpoint in the initial request accomplis=
hes
this.
Advertisement of Web services patterned after the Init=
ial
sequence in this scenario adheres to the “Using
WSDL in a UDDI Registry, Version 1.07” Best Practice document. A uddi:tModel
representing the Web service type references the containing document for th=
e wsdl:binding of the Initial
operation. The wsdl:binding corresponding to th=
is
portion of the Web service type is referenced using an xpointer based fragm=
ent
identifier appended to the WSDL file URL.&=
nbsp;
The uddi:bindingTemplate for the Initial sequence captu=
res
the service endpoint and references the uddi:tModel(s)
for the Web service type.
Because the Final sequence in this scenario occurs bet=
ween
the two parties that participate in the Initial sequence, no advertisement =
or
discovery of this sequence is desired or necessary.
Advertising Basic Callback Web service=
s in
this way enables discovery using the inquiry patterns supported by the UDDI
Inquiry API set (see
http://www.uddi.org/pubs/ProgrammersAPI-V2.04-Published-20020719.pdf). These include the browse pattern, =
the
drill-down pattern and the invocation pattern.
General UDDI Constraints are listed in Section =
span>5.17.
This section identifies the threats most relevant to t=
his
Usage Scenario as described in Appendix 1 where additional information on B=
asic
Profile compliant countermeasures may also be found.
Additional constraints may apply if HTTPS is used to
implement security. These are Basic Profile requirements: R5000, R5001, R50=
10.
Appendix 1 has additional guidelines on Security.
As of this writing no specific threat has been identif=
ied as
being singularly relevant to this Usage Scenario, though Replay is being
investigated as a potential candidate.
This section details common Web service threats and su=
ggests
possible countermeasures that are compliant with the Basic Profile. The
countermeasures detailed here are best applied through a risk assessment of
your Web service application.
This information presented here is not intended to be =
an
exhaustive or encyclopedic treatment of the security issues confronting Web
services developers. Rather, it is designed to provide an intermediate
assessment of security issues that briefly explores the intersection between
traditional security issues and their manifestation in the Web services
architecture.
=
Authentication
is a mechanism or a protocol that demonstrates proof of an asserted =
identity. Using an
authentication mechanism, a Web service can draw conclusions about the send=
er
of a request or response message, and then act on the message. Many types of
authentication mechanisms and protocols have been developed, including pass=
word
schemes, Secure Sockets Layer (SSL), Kerberos, and public key infrastructur=
e.
Each mechanism has advantages and limitations. With respect to
interoperability, each mechanism introduces a variety of challenges. Web
services can usually rely on the software platform to provide interoperable
transport authentication. Additionally, Web services may wish to share
authentication information across domains to provide single sign-on within a
community of cooperating business entities.
Authentication requirements are usually asymmetrical b=
etween
service requestors and service providers. Therefore, authentication for Web
services can be further subdivided as below.
Threat
The threats to a Web service=
that
does not authenticate users include access to data or resources by unauthor=
ized
entities, and ‘man-in-the-middle attacks’. In man-in-the-middle attacks, an
unauthorized entity intercepts messages between requestor and responder,
enabling eavesdropping and data manipulation. In very sophisticated Web
services environments, a Web service provider may not be able to authentica=
te all
parties involved in a transaction, and may therefore be required to delegate
trust to other Web services.
Since Web services may rely on directory services to f=
ind
providers of services (such as UDDI), authentication must be ensured in cer=
tain
processes such as consulting UDDI registries or downloading WSDL files. If
authentication is not required by a directory, a relatively easy attack wou=
ld
be to falsify a WSDL file, causing reliant Web services to bind to improper
ports.
Countermeasure
A Web service SHOULD authenticate the sender of a request. Some
specific situations in which Web services should authenticate requests incl=
ude
those in which underlying state is changed, in which there is a charge for
using the service, or where the information returned by the service is
privileged.
Authentication of the service
requester is the appropriate countermeasure. Client authentication can be
performed using agreed upon digital certificates in the client authenticati=
on
piece of an SSL/TLS exchange. The digital certificates exchanged during the=
SSL
handshake must chain to a certificate authority agreed upon by both client =
and
server.
Threat
An attack on a service reque=
ster is
one that interposes a false or ‘spoofed” service that supplies
responses resembling those provided by the expected service. For example, a
“man-in-the-middle” might substitute a false response message f=
or a
genuine response, leading to request/response mismatches.
Countermeasure
Authentication of the servic=
e is the
appropriate countermeasure. An SSL/TLS connection can provide server
authentication and is typically sufficient protection from Web service prov=
ider
spoofing for point-to-point transactions.
Authorization is the process of determining the capabi=
lities
granted to an entity by a service provider or another trusted entity. While authentication determines wh=
ich
entities can access a Web service, authorization determines which features =
of
that Web service can be accessed by the authenticated entity. In some cases
even authenticated entities must be restricted to a subset of functions
provided by a Web service.
Threat
Unauthorized access to computational resources or protected data.
Countermeasure
Apply authorization mechanisms. Web services requests are
fulfilled based on the authorization assigned to a particular requestor by =
the
service provider. A Web service m=
ay
need to communicate its authorization requirements through a policy.
A simple Web service may hav=
e one
authorization level: i.e., I will execute process X for any user authentica=
ted
using a recognized token. However, more sophisticated mechanisms may be
required for Web services designed to service a range of consumers.
Threat
A compromise of privileged
information through unauthorized access. In a messaging environment (as opp=
osed
to a session environment) it is important to evaluate the message protection
characteristics of a Web service, because a Web service may not know the
ultimate destination or the full route of the data being sent. Intermediari=
es
may be traversed and if the data is unprotected, might read the confidential
contents of a message, or they might be able to deduce confidential informa=
tion
by the mere fact that a particular message (or a message of a certain type,=
or
messages in a certain frequency) was sent.
Countermeasure
Encryption is the primary de=
fense
against a breach of confidentiality. How encryption is applied can vary wid=
ely.
The SSL/TLS protocol encrypts messages for the duration of the session. .
However, at each end-point, the message will be fully decrypted. An excepti=
on
to this situation is SSL Proxy tunneling. In which a client proxy opens a
connection to a secure server, copying data in both directions without inte=
rvening
in the secure transaction.
There are ways to address the problem of end-to-end
confidentiality while remaining compliant, though out of scope, of the Basic
Profile. As an example, XML Encryption can be used to selectively encrypt
elements or the entire message. There are many configurations, but one is to
have the SOAP implementation encrypt the message payload, while leaving oth=
er
information "in the clear" in the SOAP header.
Threat
Loss of data integrity is the
unauthorized modification of a request or response. The threat to Web servi=
ces
is the malicious alteration or the accidental corruption of data.
Countermeasure=
Messages sent using SSL/TLS have guaranteed data integ=
rity
for the duration of the exchange.
Another technique compliant, yet out of scope, with the
Basic Profile is the use of digital signatures and message digests to provi=
de
proof of data integrity using XML Digital Signature. These can be applied to
complete XML messages, or to portions of XML documents according to the XML
Digital Signature specification.
Threat
A basic attack on a Web serv=
ice is
an attempt to re-use a once valid message. Certain elements of a Web servic=
es
message, such as a security token, can also be reused as part of a different
message to give the impression of a valid request or response.
Countermeasure
Replay attacks can be addres=
sed by
using message timestamps and caching, and through the use of universally un=
ique
identifiers on all messages.
One of the best countermeasu=
res for
any of the above security issues is a robust auditing/logging mechanism. In
combination with authentication mechanisms, auditing and logging mechanisms=
can
provide chains of evidence that permit runtime infractions of trust policie=
s to
be remedied by the offline trust infrastructure of business agreements and
contractual law.
Like any networked application, Web services are expos=
ed to
standard network security vulnerabilities such as:
- Unauthorized users gaining direct access to netwo=
rk
resources
- Virus or Trojan horse programs being transmitted
within otherwise valid XML messages
- Misconfiguration or improper coordination of inte=
rnal
resources by a Web services provider.
- Exploitation of known weaknesses
- Denial of Service attacks
5 =
Appendix
2 – Constraints
This section provides a mapping of constraints listed =
in the
Basic Profile to each of the flow activities identified in Section 2 and wi=
thin
each scenario. In carrying out each activity, the listed constraints should=
be
consulted in the Basic Profile to check for compliance with the details of =
the
constraint.
- XML Representation of SOAP Messages: R4001, R1008,
R1009, R1010, R1012, R1013
- XML Representation of SOAP Messages: R4001, R1008,
R1009, R1010, R1012, R1013, R1015, R1017
- Envelope structure: R1011, R2714
- Envelope requirements: R1011, R1015, R1028, R2714=
- XML Representation of SOAP Messages: R1005, R1006,
R1007, R1011, R1014, R2735, R2737
- The SOAP Processing Model: R1025, R1029, R1030
- RPC messages: R2729
- XML Representation of SOAP Messages: R1005, R1006,
R1007, R1014, R1017, R1028, R1029, R1030
5.7 Write SOAP Header =
- XML Representation of SOAP Messages: R4001, R1005,
R1008, R1009, R1010, R1012, R1013,
- The SOAP Processing Model: R1027
- Using SOAP in HTTP: R1109
- Header blocks: R2738, R2739, R2751, R2752, R2753<=
/li>
5.8 Process
SOAP Header
- XML Representation of SOAP Messages: R1012, R1005,
R1008, R1009, R1010, R1012, R1013, R1015, R1017,
- The SOAP Processing Model: R1025, R1026, R1027,
R1028, R1029, R1030,
The following constraints apply to both HTTP and HTTPS=
.
- General: R1108, R1140, R1141, R1132
- Status code: R1106, R1107, R1111, R1112, R1113,
R1114, R1115, R1116, R1124, R1125, R1126, R1130
- SOAPAction Header: R1109, R2713, R2744, R2745
- Cookies: R1120, R1121, R1122, R1123
The following constraints apply to both HTTP and HTTPS=
.
- General: R1110, R1140, R2746
- Status code: R1107, R1111, R1112, R1113, R1114,
R1115, R1116, R1124, R1125, R1126, R1130, R1131
SOAPAction
Header: R1119
- Cookies: R1120, R1121, R1122, R1123
5.11 General WSDL Constraints<=
/span>
- Description of an Instance: R0001
- Importing documents into WSDL: R2001, R2002, R200=
3,
R2004, R2005, R2007, R2008
- Constraints on the overall structure of WSDL: R20=
20,
R2021, R2022, R2023, R2024, R2025, R2026, R2027, R2028, R4002, R4003=
li>
- WSDL Extensions: R2747, R2748
- Constraint on use of QNames: R2101
- Constraint on declaration of array types: R2110,
R2111, R2112, R2113
- Usage of XML Schema: R2105, R2114, R2800, R2801=
li>
- Constraints relating to bindings and parts: R2201,
R2202, R2203, R2204, R2206, R2207, R2208, R2210
- Constraints on portType: R2209
- Wire representation of the message: R2301, R2302,
R2305, R2306, R2710, R2712
- Constraints on operations: R2303, R2304
- Structure: R2029
- Allowed bindings: R2401, R2700
- Transport constraints: R2701, R2702
- Constraints on soap:style: R2705
- Constraints on soap:use: R2706, R2707
- Relationship to portTypes: R2709, R2718
- Using SOAPAction: R2713
- Using soap:namespace attribute: R2716, R2717, R27=
26
- Faults and header constraints: R2719, R2720, R2721, R2722, R=
2723,
R2740, R2741, R2749
5.16=
Constraints on WSDL Port=
h2>
- Description of an Instance: R0001
- Constraints on binding templates: R3100
- Constraints on tModels: R3002, R3003, R3005, R301=
0
6&nb=
sp;
References
[1] WS-I Basic Profile vers=
ion 1.0
from www.ws-i.org.
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