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WS-Security

WS-Security . Clement Song 02-09-04. Outline. What is WS-Security? Why WS-Security? Terminology How to Secure? Code Demos Reference. What is WS-Security?. WS-Security: soap message protection through message integrity, confidentiality, and single message authentication

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WS-Security

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  1. WS-Security Clement Song 02-09-04

  2. Outline • What is WS-Security? • Why WS-Security? • Terminology • How to Secure? • Code • Demos • Reference

  3. What is WS-Security? • WS-Security: • soap message protection through message integrity, confidentiality, and single message authentication • extensible and flexible (multiple security tokens, trust domains, signature formats, and encryption technologies. ) • a flexible set of mechanisms that can be used to construct a range of security protocols Source: WS-Security version 1.0. ref[1]

  4. Why WS-Security? • Secure soap message exchange

  5. Terminology Reference • Claim - A claim is a statement that a requestor makes (e.g. name, identity, key, group, privilege, capability, etc). • Security Token - A security token represents a collection of claims. • Signed Security Token - A signed security token is a security token that is asserted and cryptographically endorsed by a specific authority (e.g. an X.509 certificate or a Kerberos ticket). • Proof-of-Possession - The proof-of-possession information is data that is used in a proof process to demonstrate the sender's knowledge of information that should only be known to the claiming sender of a security token.

  6. Terminology Reference • Digest - A digest is a cryptographic checksum of an octet stream • Signature - A signature is a cryptographic binding of a proof-of-possession and a digest. This covers both symmetric key-based and public key-based signatures. Consequently, non-repudiation • Non-repudiation - means to ensure that a transferred message has been sent and received by the parties claiming to have sent and received the message. A way to guarantee that the sender of a message cannot later deny having sent the message and that the recipient cannot deny having received the message.

  7. How to Secure? • Integrity - information is not modified in transit • XML signature in conjunction with security tokens • Multiple signature, multiple actors, additional signature formats

  8. How to Secure? • Confidentiality - only authorized actors or security token owners can view the data • XML encryption in conjunction with security tokens • Multiple encryption processes, multiple actors

  9. How to Secure? • Authentication – you are whom you said you are • Security Tokens

  10. Syntax <S:Envelope> <S:Header> ... <Security S:actor="...“ S:mustUnderstand="..."> ... </Security> ... </S:Header> <S:Body>… </S:Body> </S:Envelope>

  11. UsernameToken Element <UsernameToken Id="..."> <Username>...</Username> <Password Type="...">...</Password> </UsernameToken> Types:

  12. UsernameToken Example <wsse:Security> <wsse:UsernameToken> <wsse:Username>Zoe </wsse:Username> <wsse:Password>ILoveDogs </wsse:Password> </wsse:UsernameToken> </wsse:Security>

  13. Binary Security Tokens <BinarySecurityToken Id=... EncodingType=... ValueType=.../> EncodingType: ValueType:

  14. Binary Security Tokens Example <wsse:BinarySecurityToken xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/04/secext" Id="myToken" ValueType="wsse:X509v3" EncodingType="wsse:Base64Binary"> MIIEZzCCA9CgAwIBAgIQEmtJZc0... </wsse:BinarySecurityToken>

  15. SecurityTokenReference <SecurityTokenReference Id="..."> <Reference URI="..."/> </SecurityTokenReference> Example: <wsse:SecurityTokenReference xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/04/secext"> <wsse:Reference URI="http://www.fabrikam123.com/tokens/Zoe#X509token"/> </wsse:SecurityTokenReference>

  16. Username Token Demo

  17. Digital Signing

  18. XML Signature <Signature ID?> <SignedInfo> <CanonicalizationMethod/> <SignatureMethod/> (<Reference URI? > (<Transforms>)? <DigestMethod> <DigestValue> </Reference>)+ </SignedInfo> <SignatureValue> (<KeyInfo>)? (<Object ID?>)* </Signature>

  19. XML Signature Example <Signature Id="MyFirstSignature" xmlns="http://www.w3.org/2000/09/xmldsig#"> <SignedInfo> <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/> <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#dsa-sha1"/> <Reference URI="http://www.w3.org/TR/2000/REC-xhtml1-20000126/"> <Transforms> <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/> </Transforms> <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> <DigestValue>j6lwx3rvEPO0vKtMup4NbeVu8nk=</DigestValue> </Reference> </SignedInfo> <SignatureValue>MC0CFFrVLtRlk=...</SignatureValue> <KeyInfo> <KeyValue> <DSAKeyValue> <P>...</P><Q>...</Q><G>...</G><Y>...</Y> </DSAKeyValue> </KeyValue> </KeyInfo> </Signature>

  20. XML signature in WS-Security <wsse:Security> <wsse:BinarySecurityToken ValueType="wsse:X509v3" EncodingType="wsse:Base64Binary" Id="X509Token"> MIIEZzCCA9CgAwIBAgIQEmtJZc0rqrKh5i... </wsse:BinarySecurityToken> <ds:Signature> <ds:SignedInfo> <ds:CanonicalizationMethod Algorithm= "http://www.w3.org/2001/10/xml-exc-c14n#"/> <ds:SignatureMethod Algorithm= "http://www.w3.org/2000/09/xmldsig#rsa-sha1"/> <ds:Reference> <ds:Transforms> <ds:Transform Algorithm= "http://...#RoutingTransform"/> <ds:Transform Algorithm= "http://www.w3.org/2001/10/xml-exc-c14n#"/> </ds:Transforms> <ds:DigestMethod Algorithm= "http://www.w3.org/2000/09/xmldsig#sha1"/> <ds:DigestValue>EULddytSo1...</ds:DigestValue> </ds:Reference> </ds:SignedInfo> <ds:SignatureValue> BL8jdfToEb1l/vXcMZNNjPOV... </ds:SignatureValue> <ds:KeyInfo> <wsse:SecurityTokenReference> <wsse:Reference URI="#X509Token"/> </wsse:SecurityTokenReference> </ds:KeyInfo> </ds:Signature> </wsse:Security>

  21. Digital-Signing Demo

  22. XML Encryption <EncryptedData Id? Type? MimeType? Encoding?> <EncryptionMethod/>? <ds:KeyInfo> <EncryptedKey>? <AgreementMethod>? <ds:KeyName>? <ds:RetrievalMethod>? <ds:*>? </ds:KeyInfo>? <CipherData> <CipherValue>? <CipherReference URI?>? </CipherData> <EncryptionProperties>? </EncryptedData>

  23. Example

  24. RSA Algorithm Demo(optional)

  25. Primary References 1. WS-Security Specification http://msdn.microsoft.com/webservices/understanding/advancedwebservices/default.aspx?pull=/library/en-us/dnglobspec/html/ws-security.asp 2. WS-Security AppNotes (examples and guidance to implementers) http://www-106.ibm.com/developerworks/library/ws-secapp/

  26. Secondary References 1. XML signature (Syntax and processing) http://www.w3.org/TR/2002/REC-xmldsig-core-20020212/ 2. XML encryption (Syntax and processing) http://www.w3.org/TR/xmlenc-core/ 2. RSA encryption Demo (Explain how RSA works) http://intercom.virginia.edu/crypto/crypto.html

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