SOA인증 실제 시험문제, S90.20 덤프문제집

문제1
Service A has two specific service consumers, Service Consumer A and Service Consumer B (1). Both service consumers are required to provide security credentials in order for Service A to perform authentication using an identity store (2). If a service consumer's request message is successfully authenticated, Service A processes the request by exchanging messages with Service B (3) and then Service C (4). With each of these message exchanges, Service A collects data necessary to perform a query against historical data stored in a proprietary legacy system. Service A's request to the legacy system must be authenticated (5). The legacy system only provides access control using a single account. If the request from Service A is permitted, it will be able to access all of the data stored in the legacy system. If the request is not permitted, none of the data stored in the legacy system can be accessed. Upon successfully retrieving the requested data (6), Service A generates a response message that is sent back to either Service Consumer A or B.
The legacy system is also used independently by Service D without requiring any authentication. Furthermore, the legacy system has no auditing feature and therefore cannot record when data access from Service A or Service D occurs. If the legacy system encounters an error when processing a request, it generates descriptive error codes.

This service composition architecture needs to be upgraded in order to fulfill the following new security requirements: 1. Service Consumers A and B have different access permissions and therefore, data received from the legacy system must be filtered prior to issuing a response message to one of these two service consumers. 2. Service Consumer A's request messages must be digitally signed, whereas request messages from Service Consumer B do not need to be digitally signed.
Which of the following statements describes a solution that fulfills these requirements?

A. The Trusted Subsystem pattern is applied by introducing a utility service that encapsulates the legacy system. Two different policies are created for Service A's service contract, only one requiring a digitally signed request message. The utility service accesses the legacy system using the single account. Service A authenticates the service consumer using the identity store and, if successfully authenticated, Service A send a message containing the service consumer's credentials to the utility service. The identity store is also used by the utility service to authenticate request messages received from Service A.
The utility service evaluates the level of authorization of the original service consumer and filters data received from the legacy system accordingly.

B. The Trusted Subsystem pattern is applied by introducing a utility service that encapsulates the legacy system. To support access by service consumers issuing request messages with and without digital signatures, policy alternatives are added to Service A's service contract. Service A authenticates the service consumer's request against the identity store and verifies compliance to the policy. Service A then creates a signed SAML assertion containing an authentication statement and the authorization decision. The utility service inspects the signed SAML assertions to authenticate the service consumer and then access the legacy system using a single account. The data returned by the legacy system is filtered by the utility service, according to the information in the SAML assertions.

C. The Trusted Subsystem pattern is applied by introducing a utility service that encapsulates the legacy system. After successful authentication, Service A creates a signed SAML assertion stating what access level the service consumer has. The utility service inspects the signed SAML assertion in order to authenticate Service A.
The utility service accesses the legacy system using the account information originally provided by Service Consumer A or B.
The utility service evaluates the level of authorization of the original service consumer and filters data received from the legacy system accordingly.

D. The Trusted Subsystem pattern is applied together with the Message Screening pattern by introducing a utility service that encapsulated the legacy system and contains message screening logic. First, the utility service evaluates the incoming request messages to ensure that it is digitally signed, when necessary. After successful verification the request message is authenticated, and Service A performs the necessary processing. The data returned from the legacy system is filtered by the utility service's message screening logic in order to ensure that only authorized data is returned to Service Consumers A and B.

정답: B

문제2
Services A, B, and C reside in Service Inventory A and Services D, E, and F reside in Service Inventory B.
Service B is an authentication broker that issues WS-Trust based SAML tokens to Services A and C upon receiving security credentials from Services A and
C. Service E is an authentication broker that issues WS-Trust based SAML tokens to Services D and F upon receiving security credentials from Services D and E.
Service B uses the Service Inventory A identify store to validate the security credentials of Services A and C.
Service E uses the Service Inventory B identity store to validate the security credentials of Services D and F.

It is decided to use Service E as the sole authentication broker for all services in Service Inventories A and B.
Service B is kept as a secondary authentication broker for load balancing purposes. Specifically, it is to be used for situations where authentication requests are expected to be extra time consuming in order to limit the performance burden on Service E.
Even though Service B has all the necessary functionality to fulfill this new responsibility, only Service E can issue SAML tokens to other services.
How can these architectures be modified to support these new requirements?

A. To provide load balancing, a service agent needs to be implemented to intercept all incoming requests to Service E.
The service agent uses a random distribution of the authentication requests between Service B and Service E.
Because the request messages are distributed in a random manner, the load between the two authentication brokers is balanced.

B. Because both Service B and Service E issue SAML tokens, these tokens are interchangeable. In order for both services to receive the same amount of authentication requests, a shared key needs to be provided to them for signing the SAML tokens. By signing the SAML tokens with the same key, the SAML tokens generated by Service B cannot be distinguished from the SAML tokens generated by Service E.

C. When time consuming authentication requests are identified, Service E can forward them to Service B.
Upon performing the authentication, Service B sends its own signed SAML token to Service E.
Because Service E trusts Service B.
it can use the Service B- specific SAML token to issue an official SAML token that is then sent to the original service consumer (that requested authentication) and further used by other services.

D. Because the federation requirements ask for SAML tokens generated by Service E, Service B cannot function as an authentication broker. To address the load balancing requirement, a new utility service needs to be introduced to provide functionality that is redundant with Service E.
This essentially establishes a secondary authentication broker to which Service E can defer time-consuming authentication tasks at runtime.

정답: A

문제3
Service A exchanges messages with Service B multiple times during the same runtime service activity. Communication between Services A and B has been secured using transport-layer security. With each service request message sent to Service B (1A. IB), Service A includes an X.509 certificate, signed by an external Certificate Authority (CA).
Service B validates the certificate by retrieving the public key of the CA (2A. 2B) and verifying the digital signature of the X.509 certificate. Service B then performs a certificate revocation check against a separate external CA repository (3A, 3B). No intermediary service agents reside between Service A and Service B.

To fulfill a new security requirement, Service A needs to be able to verify that the response message sent by Service B has not been modified during transit. Secondly, the runtime performance between Services A and B has been unacceptably poor and therefore must be improved without losing the ability to verify Service A's security credentials. It has been determined that the latency is being caused by redundant security processing carried out by Service B.
Which of the following statements describes a solution that fulfills these requirements?

A. The Data Origin Authentication pattern can be applied together with the Service Perimeter Guard pattern to establish a perimeter service that can verify incoming request messages sent to Service B and to filter response messages sent to Service A.
The repository containing the verification information about the Certificate Authorities can be replicated in the trust domain of the perimeter service. When access is requested by Service A, the perimeter service evaluates submitted security credentials by checking them against the locally replicated repository. Furthermore, it can encrypt messages sent to Service A by Service B.
and attach a signed hash value.

B. Apply the Trusted Subsystem pattern to introduce a utility service that performs the security processing instead of Service B.
The utility service can verify the security credentials of request messages from Service A and digitally sign messages sent to Service A to enable verification of message integrity. Furthermore, the utility service can perform the verification of security credentials submitted by Service A only once per runtime service activity. After the first message exchange, it can issue a SAML token to Service A that gets stored within the current session. Service A can then use this session- based token with subsequent message exchange. Because SAML tokens have a very small validity period (in contrast to X.509 certificates), there is no need to perform a revocation check with every message exchange.

C. WS-SecurityPolicy transport binding assertions can be used to improve performance via transport-layer security The use of symmetric keys can keep the encryption and decryption overhead to a minimum, which will further reduce the latency between Service A and Service B.
By encrypting the messages, attackers cannot modify message contents, so no additional actions for integrity verification are needed.

D. Service B needs to be redesigned so that it performs the verification of request messages from Service A only for the first message exchange during the runtime service activity. Thereafter, it can issue a SAML token to Service A that gets stored within the current session. Service A then uses this session-based token with subsequent message exchanges. Because SAML tokens have a very small validity period (in contrast to X.509 certificates), there is no need to perform a revocation check with every message exchange.

정답: B

최신SOA Security Lab - S90.20무료샘플문제

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