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SOA Security Lab Sample Questions:

1. Service Consumer A sends a request message with an authentication token to Service A, but before the message reaches Service A, it is intercepted by Service Agent A (1). Service Agent A validates the security credentials and also validates whether the message is compliant with Security Policy A.
If either validation fails, Service Agent A rejects the request message and writes an error log to Database A (2A). If both validations succeed, the request message is sent to Service A (2B).
Service A retrieves additional data from a legacy system (3) and then submits a request message to Service B Before arriving at Service B, the request message is intercepted by Service Agent B (4) which validates its compliance with Security Policy SIB then Service Agent C (5) which validates its compliance with Security Policy B.
If either of these validations fails, an error message is sent back to Service A.
that then forwards it to Service Agent A so that it the error can be logged in Database A (2A). If both validations succeed, the request message is sent to Service B (6). Service B subsequently stores the data from the message in Database B (7).
Service A and Service Agent A reside in Service Inventory A.
Service B and Service Agents B and C reside in Service Inventory B.
Security Policy SIB is used by all services that reside in Service Inventory B.
Service B can also be invoked by other service from within Service Inventory B.
Request messages sent by these service consumers must also be compliant with Security Policies SIB and B.

New services are being planned for Service Inventory A.
To accommodate service inventory-wide security requirements, a new security policy (Security Policy SIA) has been created. Compliance to Security Policy SIA will be required by all services within Service Inventory A.
Some parts of Security Policy A and Security Policy SIB are redundant with Security Policy SIA.
How can the Policy Centralization pattern be correctly applied to Service Inventory A without changing the message exchange requirements of the service composition?

A) Due to the amount of overlap among Security Policy A, Security Policy SIA, and Security Policy SIB, the Policy Centralization pattern cannot be correctly applied without changing the message exchange requirements of the service composition.
B) The parts of Security Policy A and Security Policy SIB that are redundant with Security Policy SIA are removed so that there is no overlap among these three security policies.
Service Agent A is updated so that it can validate messages for compliance with both Security Policy A and Security Policy SIA. Service Agent B is updated so that it can validate messages for compliance with both Security Policy SIA and Security Policy SIB.
Service Agent C remains unchanged.
C) The parts of Security Policy A and Security Policy SIB that are redundant with Security Policy SIA are removed so that there is no overlap among these three security policies. A new service agent is introduced into Service Inventory A to validate compliance to the new Security Policy SIA prior to messages being validated by Service Agent A.
Another new service agent is introduced into Service Inventory B to validate compliance to the new Security Policy SIA prior to messages being validated by Service Agents B and C.
D) The parts of Security Policy A that are redundant with Security Policy SIA are removed so that there is no overlap between these two security policies. A new service agent is introduced into Service Inventory A to validate compliance to the new Security Policy SIA prior to messages being validated by Service Agent A.

2. 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) 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.
B) 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.
C) 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.
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.

3.

A) The Service A logic needs to be modified to work with the two new databases. Service A needs to be able to access the Public Database and the Private Database when it receives a request message from a service consumer with private access permissions, and it must only access the Public Database when it receives a request message from a service consumer with public access permissions. Furthermore, any response messages issued by Service A containing private data need to be encrypted.
B) A utility service needs to be created and positioned between Service A and the service consumer. The utility service can contain screening logic that can verify the service consumer's credentials and then forward the request message to the Private Database or to the Public Database, depending on the service consumer's access permissions.
Because each request message is evaluated by the database, no filtering of the returned data is necessary. The data is sent back to the consumer in a response message encrypted using symmetric key encryption.
C) After the service consumer's request message is authenticated. Service A can generate a one-time symmetric encryption key that it sends to the service consumer. This key is encrypted by the public key of the service consumer. After the service consumer acknowledges the receipt of the one-time encryption key, Service A forwards the service consumer's data access request (and the corresponding credentials) to both databases.
After receiving the responses from the databases, Service A compiles the results into a single response message. This message is encrypted with the one-time key and sent by Service A to the service consumer.
D) Each record in Database A is classified as either private or public. After Service A is invoked by a service consumer (1), it authenticates the request message using an identity store and retrieves the corresponding authorization (2, 3). Once authorized, the service consumer's request is submitted to Database A (4), which then returns the requested data (5) If the service consumer has private access permissions, all of the returned data is included in Service A's response message (6). If the service consumer has public access permissions, then Service A first filters the data in order to remove all unauthorized private data records, before sending to the response message to the service consumer (6).

An investigation recently detected that private data has been leaked to unauthorized service consumers. An audit of the Service A architecture revealed that Service A's filtering logic is flawed, resulting in situations where private data was accidentally shared with service consumers that only have public access permissions. Further, it was discovered that attackers have been monitoring response messages sent by Service A in order to capture private data. It is subsequently decided to split Database A into two databases: one containing only private data (the Private Database) and the other containing only public data (the Public Database).
What additional changes are necessary to address these security problems?
E) The Service A architecture can be enhanced with certificate-based authentication of service consumers in order to avoid dependency on the identity store. By using digital certificates, Service A can authenticate a service consumer's request message and then forward the data access request to the appropriate database. After receiving the responses from the databases, Service A can use the service consumer's public key to encrypt the response message that is sent to the service consumer.

Solutions:

Question # 1 Answer: D

Question # 2 Answer: C

Question # 3 Answer: A,D