HP UX Security Products and Features Software manual Bilateral Authentication

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Common Data Security Architecture (CDSA) White Paper

Validating the CSP Credentials

Bilateral Authentication

In the ﬁnal set of integrity checks, known as bilateral authentication, the CSP add-in module checks the integrity of the CSSM manager that requested the CSP’s loading to ensure the CSSM has not been tampered with.

1.The CSP reconstructs the certiﬁcate chain from the root public key embedded in the CSP shared library to the CSSM signer’s certiﬁcate, using the certiﬁcates embedded in the credential ﬁle.

2.Once the certiﬁcate chain is veriﬁed, the signature in the .DSA ﬁle is veriﬁed, using the public key of the last certiﬁcate in the chain (that is, the CSSM signer’s certiﬁcate).

3.An SHA-1 hash is calculated of the CSSM section in the .MF ﬁle and compared to the hash in the .SF ﬁle.

4.If the hashes match, an SHA-1 hash of the CSSM shared lbrary is calculated and compared to the hash n the .MF ﬁle.

5.If the hash matches, the CSP looks for the function that called the bilateral authentication function (AddInAuthenticate()) and veriﬁes that the function was called by the CSSM shared library.

After this is done, the integrity checks for the loaded shared library are complete. At this point, another add-in can be loaded and veriﬁed, if necessary.

In-Memory vs. Static Checking

A difference exists in the way NT and HP-UX ensures the integrity of processes in memory.

In the original Intel CDSA Framework, which operates on the Windows NT operating system, hash evaluations are made of loaded shared libraries (called DLLs in NT) that are in computer memory. These in-memory checks are necessary because the NT operating system does not protect running processes from tampering. By contrast, once an HP-UX process is running, it can be accessed only by the user who owns that process or the superuser. Thus, in-memory checks are not performed in the HP CDSA Framework.

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Chapter 1

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Contents Contents Sample Install Program Generating the Credential File Migrating to Cdsa ZIP format Private Key FileCommon Data Security Architecture Cdsa White Paper ChapterGlossary of Cdsa Terms and Acronyms Glossary of Cdsa Terms and AcronymsGlossary of Cdsa Terms and Acronyms RC2 Glossary of Cdsa Terms and Acronyms Glossary of Cdsa Terms and Acronyms Glossary of Cdsa Terms and Acronyms Glossary of Cdsa Terms and Acronyms HP’s Implementation of Cdsa What Is CDSA?What Is CDSA? HP-UX Cdsa Product OverviewWhat Is CDSA? Cdsa Components in HP-UX Cdsa Components on HP-UXWhat Is CDSA? Example of Cdsa APIs Used for Applications vs. Shared Cdsa in the Context of Other Security ApplicationsLibraries CDSA, shown relative to higher-level protocols and user ApplicationsHP’s Paradigm Shift Common Security Services Manager Cssm Common Security Services Manager Cssm APICssm Module Information Files Cssmnotlongfilenamesys Public/Private Key Algorithms Cryptography Service Provider CSP APICryptography Service Provider CSP API Dual Asymmetric Key AlgorithmSymmetric Key Algorithm Authenticating a Digital Signature RC2 or RC4Cryptography Service Provider CSP API Hash Interaction between CSP and Applications CSP Operations Cryptography Service Provider CSP API Cryptography Service Provider CSP API Extensibility Functions Supported Functions and AlgorithmsCssmalgidcdmf Cssmalgiddsa Cssmalgiddh Purpose Pass-Through ID Certiﬁcate Library Services CL API Certiﬁcate Library Services CL APIWhat is a Certiﬁcate? Outline of a Generic CertiﬁcateCertiﬁcate Revocation List CRL and Operations Interaction between Certiﬁcate Library and Application Interaction between Cssm and Certiﬁcate Library Interface Operations on CertiﬁcatesCertiﬁcate Library Interface Certiﬁcate Library Services CL API Certiﬁcate Library Services CL API Certiﬁcate Library Services CL API INTELX509V3PASSTHROUGHCREATEENCODEDNAME INTELX509V3PASSTHROUGHENCODENAME INTELX509V3PASSTHROUGHENCODEALGID INTELX509V3PASSTHROUGHREADCERTFROMFILE INTELX509V3PASSTHROUGHENCODEREVOKEDCERTLIST INTELX509V3PASSTHROUGHFINDSUPPORTINGCSP INTELX509V3PASSTHROUGHCSSMKEYTOSPKI Role of Add-In Modules in the Cdsa Framework Introduction to Add-in ModulesIntroduction to Add-in Modules Design Criteria for Add-In Modules Global Unique Identiﬁer GuidInitializer Code to Register Services with Cssm Add-In Module Install ProgramTo Install an Add-In Library How to Create a Cdsa Add-In Module for How to Create a Cdsa Add-In Module for HP-UXLd -b -o libmylib.1 +I MyAddInInit Implementing Integrity Checking in Add-In Modules Programming Self-Check Functions into the Initializer How to Create a Cdsa Add-In Module for HP-UX How to Create a Cdsa Add-In Module for HP-UX How to Create a Cdsa Add-In Module for HP-UX How to Create a Cdsa Add-In Module for HP-UX Typeprocedure How to Create a Cdsa Add-In Module for HP-UX Or specify the following for CL/TP/DL add-ins With a Cssm capable of integrity checking Certiﬁcate Chain Validating the CSP CredentialsCredential File Validating the CSP CredentialsValidation Sequence Verifying a Certiﬁcate ChainIntegrity Check prior to Loading Verifying the signature on the .SF ﬁleSHA-1 Self Check 11 Verifying the validity of the CSP libraryBilateral Authentication In-Memory vs. Static CheckingFurther References Concluding RemarksConcluding Remarks Concluding Remarks Sample Install Program Appendix aAppendix a Appendix a Cssmapimemoryfuncs Appendix a Else if argc != Destpath Sample Install Program Appendix a Sample Install Program Generating the Credential File Appendix BHP Signing Policy for CSP Add-In Vendors for Cdsa Version HP Signing Policy for CSP Add-In Vendors for Cdsa VersionSample Add-in Module Code Appendix CAppendix C Appendix C Sample Add-in Module Code Appendix C Cssmreturn = Null Sample Add-in Module Code == Cssmfail Cssmmodulefuncs Appendix C Sample Add-in Module Code Appendix C Sample Add-in Module Code Data 100 Appendix C 101 102 Appendix C 103 104 Functions Needed for Add-in Module Integrity Appendix D 105106 Trouble Shooting HP Cdsa Appendix E 107Cdsa API Errors Cdsa API Errors108 Appendix E 109 110 Appendix E 111 112 Appendix E 113 114 Appendix E 115 116 Appendix E 117 Cdsa Start Up Errors when calling CSSMModuleAttach Cdsa Start Up Errors when calling CSSMModuleAttach118 Appendix E 119 Debugging Core Dumps Using DDE to Debug Cdsa Applications120 Migrating to Cdsa Appendix F 121122 Appendix F 123 DL data structures 124ZIP format Appendix G 125126 Appendix G 127 128 Private Key File Appendix H 129Private Key File Contention 130

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