// Copyright (c) 2005-2010 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include "logservsecurity.h"

#include <e32capability.h>

#include "LogServResourceInterpreter.h"

#include "LogCliServShared.h"

#include "logservpanic.h"

/**

The max number of TCapability(s) that can be used to instantiate a TSecurityPolicy

@internalComponent

*/

const TInt KMaxCapsPerOp = 7;

///////////////////////////////////////////////////////////////////////////////

// TCaps class - declaration and implementation

/**

The class represents a static array of TCapability items (it can't grow or shrink).

The class should be used every time when there is a need of a static TCapability array.

It offers an overloaded "[]" operator with run-time bounds checks.

@internalComponent

*/

class TCaps

	{

public:	

	TCaps();

	inline TInt MaxSize() const

		{

		return KMaxCapsPerOp;

		}

	inline TCapability& operator [](TInt aIndex)

		{

		__ASSERT_DEBUG(aIndex >= 0 && aIndex < MaxSize(), User::Invariant());

		return iItems[aIndex];

		}

	inline const TCapability& operator [](TInt aIndex) const

		{

		__ASSERT_DEBUG(aIndex >= 0 && aIndex < MaxSize(), User::Invariant());

		return iItems[aIndex];

		}

private:

	TCapability iItems[KMaxCapsPerOp];

	};

/**

The controlled capabilities are initialized with ECapability_None value.

*/

TCaps::TCaps()

	{

	for(TInt i=0;i<MaxSize();++i)

		{

		iItems[i] = ECapability_None;

		}

	}

///////////////////////////////////////////////////////////////////////////////

// TEventPolicy structure - declaration and implementation

/**

Each LogEngServer event defined in Logwrap.rss has two associated

TSecurityPolicy(s) - one each for read/write operations. This structure 

contains one read and one write policy per defined LogEngServer event.

@internalComponent

*/

struct TEventPolicy 

	{

	TEventPolicy(TUid aEventType, const TCaps& aReadCaps, const TCaps& aWriteCaps);

	TUid 			iEventType;// event type defined in LOGWRAP.RSS

	TSecurityPolicy	iReadPolicy;

	TSecurityPolicy	iWritePolicy;	

	};

/**

@param aEventType Event type. It could be one of the following: KLogCallEventType,

					KLogDataEventType, KLogFaxEventType, KLogShortMessageEventType,

					KLogMailEventType, KLogTaskSchedulerEventType, KLogPacketDataEventType.

					See LOGWRAP.RSS file where these constants are defined.

@param aReadCaps Read capablities for aEventType argument. The client, who wants to use

			 	 that event type ("read" operations), must satisfy aRead set of capabilities.					

@param aWriteCaps Write capablities for aEventType argument. The client, who wants to use

			 	 that event type ("write" operations), must satisfy aWrite set of capabilities.					

*/	

TEventPolicy::TEventPolicy(TUid aEventType, const TCaps& aReadCaps, const TCaps& aWriteCaps) :

	iEventType(aEventType),

	iReadPolicy(aReadCaps[0],aReadCaps[1],aReadCaps[2],aReadCaps[3],aReadCaps[4],aReadCaps[5],aReadCaps[6]),

	iWritePolicy(aWriteCaps[0],aWriteCaps[1],aWriteCaps[2],aWriteCaps[3],aWriteCaps[4],aWriteCaps[5],aWriteCaps[6])

	{

	}

///////////////////////////////////////////////////////////////////////////////

// TSecurityInfoReader class declaration

//Forward declaration

class CLogServSecurityImpl;

/**

The class manages the reading of the Security policy data from Logwrap.rss and storing 

it in the supplied as an argument CLogServSecurityImpl object.

@internalComponent

*/

class TSecurityInfoReader

	{

public:

	TSecurityInfoReader(CLogServResourceInterpreter& aResourceInterface, 

						CLogServSecurityImpl& aLogServSecurity);

	void ReadL();

private:

	TInt GetEventTypeCountL();

	void GetCapabilities(TResourceReader& aReader, TCaps& aCaps);

private:

	CLogServResourceInterpreter& iResourceInterface;

	CLogServSecurityImpl& iLogServSecurity;

	};

///////////////////////////////////////////////////////////////////////////////

// CLogServSecurityImpl class declaration and implementation.

/**

The class implements pure virtual methods in CLogServSecurity class.

All functionality, related to processing the data in LogEngServer resource file,

is delegated to an instance of TSecurityInfoReader class.

@internalComponent

*/

class CLogServSecurityImpl : public CLogServSecurity

	{

	friend class TSecurityInfoReader;

public:

	static CLogServSecurityImpl* NewL(CLogServResourceInterpreter& aResourceInterface);

	virtual ~CLogServSecurityImpl();		

	virtual TBool IsAllowed(const RMessage2& aMsg, TUid aEventType, TEventOp aEventOp, const char* aDiagnostic);

#ifdef LOGSERV_CAPABILITY_TEST

	virtual TSecurityPolicy SecurityPolicy(TUid aEventType, TEventOp aEventOp);

#endif //LOGSERV_CAPABILITY_TEST

private:

	CLogServSecurityImpl();

	void ConstructL(CLogServResourceInterpreter& aResourceInterface);		

	const TSecurityPolicy& FindPolicy(TUid aEventType, TEventOp aEventOp) const;

private:

	RArray<TEventPolicy> iPolicyCon;

	TSecurityPolicy iPassAllPolicy;

	};

/**

Standard, phase-one factory method for creation of objects of CLogServSecurityImpl type.

@param aResourceInterface A reference to CLogServResourceInterpreter object used for reading

 						  the LogEngServer resource file (logwrap.rss). It is used only durring 

 						  the construction phase of CLogServSecurityImpl instance.

@return A pointer to the created CLogServSecurityImpl instance.

@leave System-wide error codes, including KErrNoMemory and reading file errors.

*/	

CLogServSecurityImpl* CLogServSecurityImpl::NewL(CLogServResourceInterpreter& aResourceInterface)

	{

	CLogServSecurityImpl* self = new (ELeave) CLogServSecurityImpl;

	CleanupStack::PushL(self);

	self->ConstructL(aResourceInterface);

	CleanupStack::Pop(self);

	return self;

	}

/**

*/

CLogServSecurityImpl::~CLogServSecurityImpl()

	{

	iPolicyCon.Close();

	}

/**

The method compares the caller's capabilities against the set of capabilities,

required for that kind of operation (read or write) and returns ETrue or EFalse.

@param aMsg The message, containing the caller capabilities which have to be checked.

@param aEventType Event type. For more details see LOGWRAP.RSS file where the  

				  UID constants are defined.

@param aEventOp The type of the operation which is about to be performed by the 

					  caller. It could be EReadOp or EWriteOp.

@return ETrue - the caller is allowed to execute the operation, EFalse - the caller's

				capabilities do not match the required set of capabilities for that

				kind of operation (read or write).	

Note: Only built-in types (included in logwrap.rss) are policed.

	  So, return ETrue if TUid argument isn't a built-in type.

*/

TBool CLogServSecurityImpl::IsAllowed(const RMessage2& aMsg, TUid aEventType, TEventOp aEventOp, const char* aDiagnostic)

	{

	const TSecurityPolicy& policy = FindPolicy(aEventType, aEventOp);

	return policy.CheckPolicy(aMsg, aDiagnostic);

	}

#ifdef LOGSERV_CAPABILITY_TEST

/**

This method is declared and implemented only if "LOGSERV_CAPABILITY_TEST" macro is defined

@param aEventType Event type. For more details see LOGWRAP.RSS file where the  

				  UID constants are defined.

@param aEventOp The type of the event operation: EReadOp or EWriteOp.

@return The related with {aEventType, aEventOp} pair TSecurityPOlicy object.

*/

TSecurityPolicy CLogServSecurityImpl::SecurityPolicy(TUid aEventType, TEventOp aEventOp)

	{

	const TSecurityPolicy& policy = FindPolicy(aEventType, aEventOp);

	return policy;

	}

#endif //LOGSERV_CAPABILITY_TEST

/**

*/

CLogServSecurityImpl::CLogServSecurityImpl() :

	iPassAllPolicy(TSecurityPolicy::EAlwaysPass)

	{

	}

/**

Standard, phase-two construction method for creation of CLogServSecurityImpl objects.

@param aResourceInterface A reference to CLogServResourceInterpreter object used for reading

 						  the LogEngServer resource file (logwrap.rss). It is used only durring 

 						  the construction phase of CLogServSecurityImpl instance.

@leave System-wide error codes, including KErrNoMemory and reading file errors.

*/	

void CLogServSecurityImpl::ConstructL(CLogServResourceInterpreter& aResourceInterface)

	{

	TSecurityInfoReader reader(aResourceInterface, *this);

	reader.ReadL();

	}

/**

The method performs a search for the related to {aEventType, aOperationType} pair 

TSecurityPolicy object. If there is no registered TSecurityPolicy object for the

supplied pair of arguments (which is possible, if aEventType argument is not a

built-in type, specified in LOGWRAP.RSS file), then the method returns a reference

to pass-all TSecurityPolicy object.

@param aEventType Event type. For more details see LOGWRAP.RSS file where the  

				  UID constants are defined.

@param aAccessType The type of the operation which is about to be performed by the 

					  caller. It could be ERead or EWrite.

@return A const reference to TSecurityPolicy object, which defines a set of capabilities,

		required for that kind of operation (read or write).

*/	

const TSecurityPolicy& CLogServSecurityImpl::FindPolicy(TUid aEventType, TEventOp aEventOp) const

	{

	for(TInt i=iPolicyCon.Count()-1;i>=0;--i)

		{

		const TEventPolicy& eventPolicy = iPolicyCon[i];

		if(eventPolicy.iEventType == aEventType)

			{

			return aEventOp == EWriteOp ? eventPolicy.iWritePolicy : eventPolicy.iReadPolicy;

			}

		}

	// aEventType wasn't found - it doesn't represent a policed event type.		

	return iPassAllPolicy;	

	}

///////////////////////////////////////////////////////////////////////////////

// CLogServSecurity implementation

/**

Standard, phase-one factory method for creation of objects of CLogServSecurity type.

@param aResourceInterface A reference to CLogServResourceInterpreter object used for reading

 						  the LogEngServer resource file (logwrap.rss).

@return A pointer to the created CLogServSecurity instance.

@leave System-wide error codes, including KErrNoMemory and reading file errors.

*/	

CLogServSecurity* CLogServSecurity::NewL(CLogServResourceInterpreter& aResourceInterface)

	{

	return CLogServSecurityImpl::NewL(aResourceInterface);

	}

/**

*/

CLogServSecurity::~CLogServSecurity()

	{

	}

///////////////////////////////////////////////////////////////////////////////

// TSecurityInfoReader class implementation

/**

@param aResourceInterface A reference to CLogServResourceInterpreter object used for reading

 						  the LogEngServer resource file (logwrap.rss).

@param aLogServSecurity A reference to CLogServSecurityImpl instance, which internal content

						will be initialized with the related information from the 

						LogEngServer resource file.

*/		

TSecurityInfoReader::TSecurityInfoReader(CLogServResourceInterpreter& aResourceInterface,

										 CLogServSecurityImpl& aLogServSecurity) :

	iResourceInterface(aResourceInterface),

	iLogServSecurity(aLogServSecurity)

	{

	}

/**

The method reads the LogEngServer events capabilities from the resource file and 

initializes with them iLogServSecurity data member;

@leave System-wide error codes, including KErrNoMemory and reading file errors.

@panic ELogSecurityCapabilitiesUndefined (107) if the total number of event types

		don't match the total number of the event capability sets.

*/	

void TSecurityInfoReader::ReadL()

	{

	TInt eventTypeCount = GetEventTypeCountL();

	TResourceReader reader;

	iResourceInterface.CreateResourceReaderLC(reader, R_LOG_SECURITY);

	TInt securityNodeCount = reader.ReadInt16();

	// For all built-in event types there _MUST_ be a corresponding set of

	// capabilities defined in logwrap.rss.

	__ASSERT_ALWAYS(eventTypeCount == securityNodeCount, Panic(ELogSecurityCapabilitiesUndefined));

	iLogServSecurity.iPolicyCon.ReserveL(eventTypeCount);

	for(TInt i=0;i<eventTypeCount;++i)

		{

		TUid eventType = {reader.ReadUint32()};

		TCaps readCaps;

		GetCapabilities(reader, readCaps);

		TCaps writeCaps;

		GetCapabilities(reader, writeCaps);

	    TInt err = iLogServSecurity.iPolicyCon.Append(TEventPolicy(eventType, readCaps, writeCaps));

        __ASSERT_ALWAYS(err == KErrNone, Panic(ELogArrayReserved));

		}

	CleanupStack::PopAndDestroy(); // the resource reader

	}

/**

The method returns the number of built-in event types defined for the LogEngServer 

in logwrap.rss - see section entitled 'r_log_initial_events'.

@return An integer number representing the number of the event types found in the 

		resource file.

@leave System-wide error codes, including KErrNoMemory and reading file errors.

*/

TInt TSecurityInfoReader::GetEventTypeCountL()

	{

	TResourceReader reader;

	iResourceInterface.CreateResourceReaderLC(reader, R_LOG_INITIAL_EVENTS);

	TInt count = reader.ReadInt16();

	CleanupStack::PopAndDestroy();

	return count;

	}

/**

The method reads the capabilities for the currently processed event.

@param aReader TResourceReader object used for reading the related resource file entries.

@param aCaps An output parameter, reference to the array where the capabilities will be

			 stored.

@panic ELogTooManyCapabilities (108) if the number of the capabilities in the resource

		file exceeds the max allowed number, which is currently set to KMaxCapsPerOp (7).

@panic ELogUnknownCapability (109) if the found capability is of unknown type.

*/

void TSecurityInfoReader::GetCapabilities(TResourceReader& aReader, TCaps& aCaps)

	{

	TInt capsCount = aReader.ReadInt16();

	__ASSERT_ALWAYS((TUint)capsCount <= aCaps.MaxSize(), Panic(ELogTooManyCapabilities));

	for(TInt i=0;i<capsCount;++i)

		{

		TInt n = aReader.ReadInt32();

		__ASSERT_ALWAYS(n >= ECapability_None && n < ECapability_Limit, Panic(ELogUnknownCapability));// its not in e32capability.h !

		aCaps[i] = TCapability(n);

		}

	}