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_LIT_SECURITY_POLICY_C1 _LIT_SECURITY_POLICY_C2 _LIT_SECURITY_POLICY_C3 _LIT_SECURITY_POLICY_C4 _LIT_SECURITY_POLICY_C5 _LIT_SECURITY_POLICY_C6 _LIT_SECURITY_POLICY_C7 _LIT_SECURITY_POLICY_S0 _LIT_SECURITY_POLICY_S1 _LIT_SECURITY_POLICY_S2 _LIT_SECURITY_POLICY_S3 _LIT_SECURITY_POLICY_V0 _LIT_SECURITY_POLICY_V1 _LIT_SECURITY_POLICY_V2 _LIT_SECURITY_POLICY_V3 Table 7-9
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Enforce one capability Enforce two capabilities Enforce three capabilities Enforce four capabilities Enforce five capabilities Enforce six capabilities Enforce seven capabilities Enforce a SecureID Enforce a SecureID and one capability Enforce a SecureID and two capabilities Enforce a SecureID and three capabilities Enforce a VendorID Enforce a VendorID and one capability Enforce a VendorID and two capabilities Enforce a VendorID and three capabilities
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Client sessions are created via an RSessionBase object and a call to the CreateSession() method Most client DLLs will derive their own subclass that calls this method with the appropriate parameters During the 9x series, another overload of CreateSession() was added that takes a pointer to a TSecurityPolicy object This allows a client to validate the SecureID or VendorID of the named server Messages to the server are delivered and responses obtained through the SendReceive() method Most client DLLs will provide wrapper functions for calls to SendReceive() to provide a more natural interface The code below shows the basic pattern behind writing a client proxy object This class will reside within a client DLL and hide the interprocess communication details
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_LIT(KCustomServerName, com_isecpartners_custom ); enum TCustomServerMessages { EDoStuff }; class RCustomSession : public RSessionBase {
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public: IMPORT_C TInt Connect(); IMPORT_C TInt DoStuff(const LString& str); }; EXPORT_C TInt RCustomSession::Connect() { return CreateSession(KCustomServerName, TVersion(), KServerDefaultMessageSlots, EIpcSession_Unsharable, &KCustomServerSID()); } EXPORT_C TInt RCustomSession::DoStuff(const LString& str) { return SendReceive(EDoStuff, TIpcArgs(&str)); }
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Servers are created by deriving two of three classes: CSession2 and either CServer2 or CPolicyServer CServer2 works well in many cases namely, where the security policy to be enforced is straightforward (for example, restricting potential clients to those with a particular SecureID upon session connection or requiring a particular capability to call a certain method) In order to enforce a policy with a CSession2 or CServer2 class, call the CheckPolicy() method of a SecurityPolicy object with RMessage& as the first parameter The result of this method is a boolean indicating whether the message was delivered by a process that conforms to the policy Wrapping calls to this method in an if statement allows for corrective action to be taken In the following example, the corrective action is to leave with a permission-denied error:
class CCustomSession : public CSession2 { private: void ServiceL(const RMessage2& msg); TInt doStuff(const LString& str); TInt getStuff(LString& str); }; void CCustomSession::ServiceL(const RMessage2& msg) { TInt status = KErrNotSupported; switch (aMessageFunction()) { case EDoStuff: {
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LString param(msgGetDesLengthL(0)); msgReadL(0, param); status = doStuff(param); break; } case EGetStuff: { if(!KEnforceTwoCaps()CheckPolicy(msg, __PLATSEC_DIAGNOSTIC_STRING( CCustomSession::ServiceL ))) { User::Leave(KErrPermissionDenied); } LString result; status = getStuff(result); __ASSERT_ALWAYS(resultLength() <= msgGetDesMaxLengthL(0), User::Leave(KErrBadDescriptor)); msgWriteL(0, result); break; } default: { _LIT(KErrMsg, Unknown function call! ); msgPanic(KErrMsg, KErrNotSupported); } } aMessageComplete(status); }
class CCustomServer : public CServer2 { public: CCustomServer(TInt priority = EPriorityNormal); private: CSession2* NewSessionL(const TVersion& version, const RMessage2& msg) const; }; CCustomServer::CCustomServer(TInt priority) : CServer2(priority, ESharableSessions) { Start(KCustomServerName); }
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CSession2* CCustomServer::NewSessionL(const TVersion&, const RMessage2&) const { if(!KClientVIDOneCap()CheckPolicy(msg, __PLATSEC_DIAGNOSTIC_STRING( CCustomServer::NewSessionL ))) { User::Leave(KErrPermissionDenied); } return new (ELeave) CCustomSession(); }
CPolicyServer should be chosen when the policy to be enforced is very complex Although substantially more complex in simple cases, it can be much simpler in complex cases The framework automatically handles checking a prospective client s policy conformance upon session initiation and for each message The first step is to create an array of message numbers in sorted increasing order Each number need not be represented, just the lower bound of a range that shares the same policy That is, if functions 0 through 3 share a policy and function 4 has its own policy, then the array should have two elements: 0 and 4 Next, a second array is created that must be the same size as the previous one to contain indices into a third array This third array contains the separate policy-enforcement objects When a message is sent to the server, its function number (or the closest number less than it) is found in the first array and the index is noted This index is used to reference into the second array in order to obtain the index into the third array, where the actual policy object is found Conceptually this can be imagined as a dictionary that maps a function ordinal to the policy to be applied, where the first array holds the dictionary key and the second array holds a reference to the policy The code below demonstrates the basics behind using the CPolicyServer class to reduce the developer effort required to enforce complex security policies
const TUInt rangesCount = 3; const TInt msgNumRanges[rangesCount] = { 0, // EDoStuff 1, // EGetStuff 2 // Non-existent functions }; const TUInt8 msgPolicyIndices[] = { CPolicyServer::EAlwaysPass, 1, CPolicyServer::EBadMessageNumber };
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