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SOA Security

SOA Security. Dr. Yuhong Yan. Content. Security Issues overview Security for SOA. Referece: R. Kanneganti and P. Chodavarapu, “SOA Security”, Manning, 2008. Security Issues Overview. Authentication Authorization Data confidentiality Data integrity an nonrepudiation

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SOA Security

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  1. SOA Security Dr. Yuhong Yan

  2. Content • Security Issues overview • Security for SOA Referece: R. Kanneganti and P. Chodavarapu, “SOA Security”, Manning, 2008

  3. Security Issues Overview • Authentication • Authorization • Data confidentiality • Data integrity an nonrepudiation • Protection against attacks • Privacy protection

  4. New Security Approaches for SOA • Besides the following issues • Authentication • Authorization • Data confidentiality • Data integrity an nonrepudiation • Protection against attacks • Privacy protection • SOA has three new security approaches • Message-level security • Security as a service • Policy-driven security

  5. Authentication Verifying the identity of users

  6. Traditional Authentication Strategy • The application is responsible for examining the evidence and validating it • A directory server that records all the user-password pairs • An algorithm that matches the number presented by the user and the number that is used on the RSA token

  7. Authentication Strategy in SOA

  8. Authorization Determine whether the identified user is authorized to access the functionality • Another name: access control • Compare authentication and authorization • Authentication: your photo ID • Authorization: allow to buy a drink?

  9. Traditional Authorization Strategy • The application is responsible for authorization, some information used is in a directory server or a configuration repository • Access control models • Role-based Access Control • Access Control List (rules)

  10. Authorization Strategy in SOA • The composite app cannot hard code authorization function • The individual services in the composite app have to do this

  11. Data Confidentiality Data exchanged over a network needs to be safeguarded • Traditional strategy to ensure data confidentiality • Encryption • Establish a secure channel • Secure Sockets Layer (SSL)/Transport Layer Security (TLS)

  12. Data Confidentiality Protection Strategy in SOA • Encryption • Establish a secure channel • SSL/TLS • Different recipients process different part of the message To ACME My order My acct info bank ACME To bank Acct info

  13. Data Integrity and Nonrepudiation Verify that the message received is what the sender sent; the sender should not able to deny having sent a msg • SSL/TLS also helps in verifying the integrity and ensuring nonrepudiation • SSL/TLS can be used for SOAP transport • Blanket encryption • We can have selective encryption also

  14. Protection Against Attacks • Vulnerabilities in application code • SQL code • Vulnerabilities introduced by poor administrative practices • The default password • Vulnerabilities inherent in computing/network infrastructuure • TCP/IP

  15. Traditional Strategy for Protection Against Attacks • Using firewall • Run applications within sandboxes • Carefully audit application code • Use intrusion detection systems

  16. Strategy for Protection against Attacks in SOA • Vulnerable to denial of service (DoS) attacks • No further discussion in this course

  17. Privacy Protection Avoid leakage of users’ private information • Flaws in access control rules • Who can access sensitive data • Vulnerabilities exploited by attackers • Inject SQL that queries sensitive data

  18. Strategy for Privacy Protection • Enhance security • Remove the vulnerabilities • Holding back real identifies • Protect the patterns that associate with sensitive data • No more discussion in this course

  19. Extending SOAP with Headers for Security

  20. Inside SOAP SOAP message Envelope (required) Header (optional) Header Entry1 … Header Entry n Body (required) Fault (optional)

  21. Header • For authentication, transaction management, and authorization, routing • Standard extensions • Customerized extensions

  22. Standard header entry attributes • Who should deal with the header entry? • actor attribute: e.g. a URI • The chained nodes: intermediaries • What do we do with the header entry? • mustUnderstand attribute: true /false • force the recipient to process the element, if not understandable, return a fault • What do we parse data in the header entry? • encodingStyle attribute: e.g. XML schema

  23. An Example for Header <soapenv:Envelope xmlns:soapenv=http://schemas.xmlsoap.org/soap/envelope/…> <SOAP-ENV:Header> <ns1:PaymentAccount xmlns:ns1=“urn:ecerami” SOAP-ENV:actor=“http://schemas.xmlsoap.org/soap/actor/next”” SOAP-ENV:mustUnderstand=“true” SOAP-ENV:encodingStyle =“http//schemas.xmlsoap.org/soap/encoding”> orsenigo473 </ns1:PaymentAccount> </SOAP-ENV:Header>

  24. Fault • faultCode • SOAP-ENV:VersionMismatch • SOAP-ENV:MustUnderstand • SOAP-ENV:Client (non existing methods) • SOAP-ENV:Server (not able to access DB) • faultString • faultActor • Detail info about the fault

  25. Fault <?xml version=‘1.0’ encoding=‘UTF-8’?> <SOAP-ENV:Envelope xmlns:SOAP-ENV=“http://schemas.xmlsoap.org/soap/envelope/” xmlns:xsi=“http://www.w3.org/1999/XMLSchema-instance” xmlns:xsd=“http://www.s3.org/1999/XMLSchema”> <SOAP-ENV:Body> <SOAP-ENV:Fault> <faultcode xsi:type=“xsd:string”>SOAP-ENV:Client</faultcode> <faultstring xsi:type=“xsd:string”> Failed to locate method (ValidateCreditCard) in class (examplesCreditCard) at /usr/local/ActivePerl-5.6/lib/ site_perl/5.6.0/SOAP/Lite.pm line 1555. </faultstring> </SOAP-ENV:Fault> </SOAP-ENV:Body> </SOAP-ENV:Envelope> P55. xml part (for faults)

  26. WS-Security: Standard Extension for Security

  27. Security Header: security claims • “My name is X.” • “X is authorized to access this resource.” • “This message is signed by X.” • “This message is encrypted using X’s public key.”

  28. An Example for Security Header <soapenv:Envelope xmlns:soapenv=http://schemas.xmlsoap.org/soap/envelope/…> <SOAP-ENV:Header> <wsse:Security … <wsse:UsernameToken wsuID=“1”> <wsse:Username> <xenc:EncryptedData> … </xenc:EncryptedData> </wsse:Username> <wsse:Password> <xenc:EncryptedData> … </xenc:EncryptedData> </wsse:Password> </wsse:UsernameToken> </SOAP-ENV:Header> </SOAP-ENV:Header>

  29. Fault Code

  30. Programming on security headers • The pattern of handler in JAX-RPC • Compose the elements in headers • The chained handlers • Axis Web service deployment description (.wsdd)

  31. Intermediaries and WS-Addressing interm1 interm1 source dest <soapenv:Envelope xmlns:soapenv=http://schemas.xmlsoap.org/soap/envelope/…> <SOAP-ENV:Header> <was:To xmlns:was=“…/ws/2004/08/addressing”> http://localhost:8080/axis/services/example6 </was:To> <was:Action xmlns:was=“…/ws/2004/08/addressing”> </wasAction> <wsse:Security soapenv:actor=“…”> … </wsse:Security> </SOAP-ENV:Header> WS-Addressing

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