/****************************************************************************
*																			*
*						Get/Delete Certificate Components					*
*						Copyright Peter Gutmann 1997-2013					*
*																			*
****************************************************************************/

#if defined( INC_ALL )
  #include "cert.h"
  #include "asn1.h"
  #include "asn1_ext.h"
#else
  #include "cert/cert.h"
  #include "enc_dec/asn1.h"
  #include "enc_dec/asn1_ext.h"
#endif /* Compiler-specific includes */

#ifdef USE_CERTIFICATES

/****************************************************************************
*																			*
*							Get Certificate Information						*
*																			*
****************************************************************************/

/* Find an attribute in an attribute list, either in the overall certificate 
   object attribute list or a per-entry attribute list.  This can also 
   return entries with two special-case properties: 
   
	ATTRIBUTE_PROPERTY_DEFAULTVALUE: The field has a default value and isn't 
		present in the list, but some other field in the same attribute is 
		present.  For example if CRYPT_CERTINFO_ISSUINGDIST_FULLNAME were 
		present in the attribute list than an attempt to read 
		CRYPT_CERTINFO_ISSUINGDIST_INDIRECTCRL, which is declared 'DEFAULT 
		FALSE', would return an entry with this property.

	ATTRIBUTE_PROPERTY_COMPLETEATTRIBUTE: The field os an identifier for a
		complete attribute, e.g. CRYPT_CERTINFO_AUTHORITYINFOACCESS, for 
		which only the individual CRYPT_CERTINFO_AUTHORITYINFO_xyz fields 
		can be present */

CHECK_RETVAL_PTR STDC_NONNULL_ARG( ( 1 ) ) \
ATTRIBUTE_PTR *findAttributeComponent( const CERT_INFO *certInfoPtr,
									   IN_ATTRIBUTE \
										const CRYPT_ATTRIBUTE_TYPE certInfoType )
	{
#ifdef USE_CERTREV
	ATTRIBUTE_PTR *attributePtr;
	REVOCATION_INFO *currentRevocation;
#endif /* USE_CERTREV */

	assert( isReadPtr( certInfoPtr, sizeof( CERT_INFO ) ) );

	REQUIRES_N( certInfoType > CRYPT_ATTRIBUTE_NONE && \
				certInfoType < CRYPT_ATTRIBUTE_LAST );

	/* If it's just a general certificate attribute, return it to the 
	   caller */
	if( !isRevocationEntryComponent( certInfoType ) )
		return( findAttributeFieldEx( certInfoPtr->attributes, 
									  certInfoType ) );

#ifdef USE_CERTVAL
	/* It's a per-entry attribute, if it's an RTCS per-entry attribute get 
	   the attribute from the currently selected entry */
	if( certInfoPtr->type == CRYPT_CERTTYPE_RTCS_REQUEST || \
		certInfoPtr->type == CRYPT_CERTTYPE_RTCS_RESPONSE )
		{
		VALIDITY_INFO *currentValidity = certInfoPtr->cCertVal->currentValidity;

		if( currentValidity == NULL )
			return( NULL );
		return( findAttributeFieldEx( currentValidity->attributes, 
									  certInfoType ) );
		}
#endif /* USE_CERTVAL */

#ifdef USE_CERTREV
	/* It's a CRL or OCSP per-entry attribute, get the attribute from the 
	   currently selected entry */
	currentRevocation = certInfoPtr->cCertRev->currentRevocation;
	if( currentRevocation == NULL )
		return( NULL );
	attributePtr = findAttributeFieldEx( currentRevocation->attributes, 
										 certInfoType );
	if( attributePtr == NULL && \
		certInfoType == CRYPT_CERTINFO_CRLREASON )
		{
		/* Revocation reason codes are actually a single range of values 
		   spread across two different extensions so if we don't find the 
		   value as a straight cRLReason we try again for a cRLExtReason.  
		   If we've been specifically asked for a cRLExtReason we don't go 
		   the other way because the caller (presumably) specifically wants 
		   the extended reason code */
		attributePtr = findAttributeFieldEx( currentRevocation->attributes,
											 CRYPT_CERTINFO_CRLEXTREASON );
		}

	return( attributePtr );
#else
	return( NULL );
#endif /* USE_CERTREV */
	}

/* Get a certificate component */

CHECK_RETVAL STDC_NONNULL_ARG( ( 1, 3 ) ) \
static int getCertAttributeComponent( const CERT_INFO *certInfoPtr,
									  IN_ATTRIBUTE \
										const CRYPT_ATTRIBUTE_TYPE certInfoType,
									  OUT int *value )
	{
	ATTRIBUTE_PTR *attributePtr;

	assert( isReadPtr( certInfoPtr, sizeof( CERT_INFO ) ) );
	assert( isWritePtr( value, sizeof( int ) ) );

	REQUIRES( certInfoType > CRYPT_ATTRIBUTE_NONE && \
			  certInfoType < CRYPT_ATTRIBUTE_LAST );

	/* Clear return values */
	*value = 0;

	/* Try and find this attribute in the attribute list */
	attributePtr = findAttributeComponent( certInfoPtr, certInfoType );
	if( attributePtr == NULL )
		return( CRYPT_ERROR_NOTFOUND );

	/* If this is a non-present field with a default value in an attribute 
	   for which some other field is present (e.g. if we're trying to read
	   CRYPT_CERTINFO_ISSUINGDIST_USERCERTSONLY, which is declared
	   DEFAULT FALSE, and CRYPT_CERTINFO_ISSUINGDIST_FULLNAME is present)
	   then we regard any default fields in the same attribute to be
	   (pseudo)-present, so we return the default value */
	if( checkAttributeProperty( attributePtr, 
								ATTRIBUTE_PROPERTY_DEFAULTVALUE ) )
		{
		const int defaultValue = getDefaultFieldValue( certInfoType );
		if( cryptStatusError( defaultValue ) )
			return( defaultValue );

		*value = defaultValue;
		return( CRYPT_OK );
		}

	/* If we've been given the ID for a complete attribute (e.g. 
	   CRYPT_CERTINFO_AUTHORITYINFOACCESS, for which only the individual 
	   CRYPT_CERTINFO_AUTHORITYINFO_xyz fields can be present), return a 
	   boolean value indicating that the overall attribute is present */
	if( checkAttributeProperty( attributePtr, 
								ATTRIBUTE_PROPERTY_COMPLETEATRIBUTE ) )
		{
		*value = TRUE;
		return( CRYPT_OK );
		}

	/* Get the attribute component value */
	return( getAttributeDataValue( attributePtr, value ) );
	}

/* Create a copy of a certificate object for external use.  This is used 
   principally to sanitise internal certificate objects, for example if 
   they're attached to a private key or for internal use only.  Since the 
   object can be either a standalone certificate or a complete certificate 
   chain we have to process it somewhat indirectly rather than just 
   instantiating a new certificate from the encoded certificate data.

   It's also used to convert to/from data-only certificates, for example to 
   convert from a stored data-only certificate to a full certificate capable 
   of being used for signature checking, this is easier than trying to 
   retroactively attach a public-key context to a data-only certificate */

CHECK_RETVAL STDC_NONNULL_ARG( ( 1, 2 ) ) \
static int getCertCopy( const CERT_INFO *certInfoPtr, 
						OUT_HANDLE_OPT CRYPT_CERTIFICATE *iCertCopy,
						const BOOLEAN isDataOnlyCert )
	{
	const CRYPT_CERTFORMAT_TYPE formatType = \
		( certInfoPtr->type == CRYPT_CERTTYPE_CERTIFICATE ) ? \
		CRYPT_CERTFORMAT_CERTIFICATE : CRYPT_CERTFORMAT_CERTCHAIN;
	MESSAGE_DATA msgData;
	BYTE certData[ 2048 + 8 ], *certDataPtr = certData;
	int status;

	assert( isReadPtr( certInfoPtr, sizeof( CERT_INFO  ) ) );
	assert( isWritePtr( iCertCopy, sizeof( CRYPT_CERTIFICATE ) ) );

	REQUIRES( certInfoPtr->type == CRYPT_CERTTYPE_CERTIFICATE || \
			  certInfoPtr->type == CRYPT_CERTTYPE_CERTCHAIN );

	/* Clear return value */
	*iCertCopy = CRYPT_ERROR;

	setMessageData( &msgData, NULL, 0 );
	status = krnlSendMessage( certInfoPtr->objectHandle, 
							  IMESSAGE_CRT_EXPORT, &msgData, 
							  formatType );
	if( cryptStatusError( status ) )
		return( status );
	if( msgData.length > 2048 )
		{
		if( ( certDataPtr = clAlloc( "getCertCopy", \
									 msgData.length + 8 ) ) == NULL )
			return( CRYPT_ERROR_MEMORY );
		}
	setMessageData( &msgData, certDataPtr, msgData.length );
	status = krnlSendMessage( certInfoPtr->objectHandle,
							  IMESSAGE_CRT_EXPORT, &msgData,
							  formatType );
	if( cryptStatusOK( status ) )
		{
		MESSAGE_CREATEOBJECT_INFO createInfo;

		setMessageCreateObjectIndirectInfoEx( &createInfo, certDataPtr,
							msgData.length, certInfoPtr->type,
							isDataOnlyCert ? KEYMGMT_FLAG_DATAONLY_CERT : \
											 KEYMGMT_FLAG_NONE );
		status = krnlSendMessage( SYSTEM_OBJECT_HANDLE, 
								  IMESSAGE_DEV_CREATEOBJECT_INDIRECT, 
								  &createInfo, OBJECT_TYPE_CERTIFICATE );
		if( cryptStatusOK( status ) )
			*iCertCopy = createInfo.cryptHandle;
		}
	if( certDataPtr != certData )
		clFree( "getCertCopy", certDataPtr );

	return( status );
	}

/****************************************************************************
*																			*
*							Get a Certificate Component						*
*																			*
****************************************************************************/

/* Get a certificate component */

CHECK_RETVAL STDC_NONNULL_ARG( ( 1, 3 ) ) \
int getCertComponent( INOUT CERT_INFO *certInfoPtr,
					  IN_ATTRIBUTE const CRYPT_ATTRIBUTE_TYPE certInfoType,
					  OUT_INT_Z int *certInfo )
	{
	int status;

	assert( isWritePtr( certInfoPtr, sizeof( CERT_INFO ) ) );
	assert( isWritePtr( certInfo, sizeof( int ) ) );

	REQUIRES( isAttribute( certInfoType ) || \
			  isInternalAttribute( certInfoType ) );

	/* Clear return value */
	*certInfo = 0;

	/* If it's a GeneralName or DN component, return it.  These are 
	   special-case attribute values so they have to come before the 
	   general attribute-handling code */
	if( isGeneralNameSelectionComponent( certInfoType ) )
		{
		SELECTION_STATE savedState;

		/* Determine whether the given component is present or not.  This
		   has a somewhat odd status return since it returns the found/
		   notfound status in the return code as well as the returned value,
		   which mirrors the behaviour when reading extension-present
		   pseudo-attributes */
		saveSelectionState( savedState, certInfoPtr );
		status = selectGeneralName( certInfoPtr, certInfoType, 
									MAY_BE_ABSENT );
		if( cryptStatusOK( status ) )
			status = selectGeneralName( certInfoPtr, CRYPT_ATTRIBUTE_NONE, 
										MUST_BE_PRESENT );
		restoreSelectionState( savedState, certInfoPtr );
		*certInfo = cryptStatusOK( status ) ? TRUE : FALSE;

		return( status );
		}
	if( isGeneralNameComponent( certInfoType ) )
		{
		SELECTION_STATE savedState;

		/* Find the requested GeneralName component and return and 
		   indication of its presence to the caller.  Since 
		   selectGeneralNameComponent() changes the current selection within 
		   the GeneralName, we save the selection state around the call */
		saveSelectionState( savedState, certInfoPtr );
		status = selectGeneralNameComponent( certInfoPtr, certInfoType );
		restoreSelectionState( savedState, certInfoPtr );
		*certInfo = cryptStatusOK( status ) ? TRUE : FALSE;

		return( status );
		}

	/* If it's standard certificate or CMS attribute, return it */
	if( ( certInfoType >= CRYPT_CERTINFO_FIRST_EXTENSION && \
		  certInfoType <= CRYPT_CERTINFO_LAST_EXTENSION ) || \
		( certInfoType >= CRYPT_CERTINFO_FIRST_CMS && \
		  certInfoType <= CRYPT_CERTINFO_LAST_CMS ) )
		{
		return( getCertAttributeComponent( certInfoPtr, certInfoType,
										   certInfo ) );
		}

	/* If it's anything else, handle it specially */
	switch( certInfoType )
		{
		case CRYPT_CERTINFO_SELFSIGNED:
			*certInfo = ( certInfoPtr->flags & CERT_FLAG_SELFSIGNED ) ? \
						TRUE : FALSE;
			return( CRYPT_OK );

		case CRYPT_CERTINFO_IMMUTABLE:
			*certInfo = ( certInfoPtr->certificate != NULL ) ? TRUE: FALSE;
			return( CRYPT_OK );

		case CRYPT_CERTINFO_XYZZY:
			{
			ATTRIBUTE_PTR *attributePtr;

			/* Check for the presence of the XYZZY policy OID */
			attributePtr = findAttributeField( certInfoPtr->attributes,
											   CRYPT_CERTINFO_CERTPOLICYID,
											   CRYPT_ATTRIBUTE_NONE );
			if( attributePtr != NULL )
				{
				void *policyOidPtr;
				int policyOidLength;

				status = getAttributeDataPtr( attributePtr, &policyOidPtr, 
											  &policyOidLength );
				if( cryptStatusOK( status ) && \
					policyOidLength == sizeofOID( OID_CRYPTLIB_XYZZYCERT ) && \
					!memcmp( policyOidPtr, OID_CRYPTLIB_XYZZYCERT,
							 sizeofOID( OID_CRYPTLIB_XYZZYCERT ) ) )
					{
					*certInfo = TRUE;
					return( CRYPT_OK );
					}
				}

			/* It's not a XYZZY certificate */
			*certInfo = FALSE;
			return( CRYPT_OK );
			}

		case CRYPT_CERTINFO_CERTTYPE:
			*certInfo = certInfoPtr->type;
			return( CRYPT_OK );

		case CRYPT_CERTINFO_CURRENT_CERTIFICATE:
		case CRYPT_ATTRIBUTE_CURRENT_GROUP:
		case CRYPT_ATTRIBUTE_CURRENT:
		case CRYPT_ATTRIBUTE_CURRENT_INSTANCE:
			{
			CRYPT_ATTRIBUTE_TYPE infoID;

			/* The subject and issuer DNs are treated as pseudo-attributes 
			   for manipulation purposes, so if these are selected 
			   (indicated by there being no attribute selected since 
			   selecting the pseudo-attribute DNs deselects any actual
			   attributes) we have to provide special-case handling for 
			   them */
			if( certInfoPtr->attributeCursor == NULL )
				{
				const SELECTION_INFO *currentSelection = \
							&certInfoPtr->currentSelection;

				switch( certInfoType )
					{
					case CRYPT_CERTINFO_CURRENT_CERTIFICATE:
					case CRYPT_ATTRIBUTE_CURRENT_GROUP:
						/* These selection types don't apply to DNs */
						break;

					case CRYPT_ATTRIBUTE_CURRENT:
						if( currentSelection->dnPtr == &certInfoPtr->subjectName )
							{
							*certInfo = CRYPT_CERTINFO_SUBJECTNAME;
							return( CRYPT_OK );
							}
						if( currentSelection->dnPtr == &certInfoPtr->issuerName )
							{
							*certInfo = CRYPT_CERTINFO_ISSUERNAME;
							return( CRYPT_OK );
							}
						break;

					case CRYPT_ATTRIBUTE_CURRENT_INSTANCE:
						if( currentSelection->dnComponent != CRYPT_ATTRIBUTE_NONE )
							{
							*certInfo = currentSelection->dnComponent;
							return( CRYPT_OK );
							}
						break;

					default:
						retIntError();
					}
				return( CRYPT_ERROR_NOTINITED );
				}

			/* The current component and field are usually the same thing 
			   since a component is one of a set of entries in a multivalued 
			   field, however in the case of complex subtypes (attribute ->
			   generalName -> generalName field) they can be distinct 
			   values.  To handle this we try for a field ID and if 
			   that's not available return the component ID */
			switch( certInfoType )
				{
				case CRYPT_ATTRIBUTE_CURRENT_GROUP:
					status = getAttributeIdInfo( certInfoPtr->attributeCursor, 
												 &infoID, NULL, NULL );
					break;

				case CRYPT_CERTINFO_CURRENT_CERTIFICATE:
				case CRYPT_ATTRIBUTE_CURRENT:
					status = getAttributeIdInfo( certInfoPtr->attributeCursor, 
												 NULL, &infoID, NULL );
					break;

				case CRYPT_ATTRIBUTE_CURRENT_INSTANCE:
					status = getAttributeIdInfo( certInfoPtr->attributeCursor, 
												 NULL, NULL, &infoID );
					if( cryptStatusError( status ) )
						status = getAttributeIdInfo( certInfoPtr->attributeCursor, 
													 NULL, &infoID, NULL );
					break;

				default:
					retIntError();
				}
			if( cryptStatusOK( status ) )
				*certInfo = infoID;
			return( status );
			}

		case CRYPT_CERTINFO_TRUSTED_USAGE:
			if( certInfoPtr->cCertCert->trustedUsage == CRYPT_ERROR )
				return( CRYPT_ERROR_NOTFOUND );
			*certInfo = certInfoPtr->cCertCert->trustedUsage;
 			return( CRYPT_OK );

		case CRYPT_CERTINFO_TRUSTED_IMPLICIT:
			status = krnlSendMessage( certInfoPtr->ownerHandle,
									  IMESSAGE_USER_TRUSTMGMT,
									  &certInfoPtr->objectHandle,
									  MESSAGE_TRUSTMGMT_CHECK );
			*certInfo = cryptStatusOK( status ) ? TRUE : FALSE;
			return( CRYPT_OK );

#ifdef USE_CERTREV
		case CRYPT_CERTINFO_SIGNATURELEVEL:
			*certInfo = certInfoPtr->cCertRev->signatureLevel;
			return( CRYPT_OK );
#endif /* USE_CERTREV */

		case CRYPT_CERTINFO_VERSION:
			*certInfo = certInfoPtr->version;
			return( CRYPT_OK );

		case CRYPT_CERTINFO_ISSUERNAME:
		case CRYPT_CERTINFO_SUBJECTNAME:
			{
			const DN_PTR *dnPtr = \
					( certInfoType == CRYPT_CERTINFO_ISSUERNAME ) ? \
					certInfoPtr->issuerName : certInfoPtr->subjectName;

			if( dnPtr == NULL ) 
				{
				*certInfo = FALSE;
				return( CRYPT_ERROR_NOTFOUND );
				}
			*certInfo = TRUE;
			return( CRYPT_OK );
			}

#ifdef USE_CERTREV
		case CRYPT_CERTINFO_REVOCATIONSTATUS:
			{
			const CERT_REV_INFO *certRevInfo = certInfoPtr->cCertRev;
			const REVOCATION_INFO *revInfoPtr = \
					( certRevInfo->currentRevocation != NULL ) ? \
					certRevInfo->currentRevocation : certRevInfo->revocations;

			if( revInfoPtr == NULL )
				return( CRYPT_ERROR_NOTFOUND );
			*certInfo = revInfoPtr->status;
			return( CRYPT_OK );
			}
#endif /* USE_CERTREV */

#ifdef USE_CERTVAL
		case CRYPT_CERTINFO_CERTSTATUS:
			{
			const CERT_VAL_INFO *certValInfo = certInfoPtr->cCertVal;
			const VALIDITY_INFO *valInfoPtr = \
					( certValInfo->currentValidity != NULL ) ? \
					certValInfo->currentValidity : certValInfo->validityInfo;

			if( valInfoPtr == NULL )
				return( CRYPT_ERROR_NOTFOUND );
			*certInfo = valInfoPtr->extStatus;
			return( CRYPT_OK );
			}
#endif /* USE_CERTVAL */

#ifdef USE_PKIUSER
		case CRYPT_CERTINFO_PKIUSER_RA:
			*certInfo = certInfoPtr->cCertUser->isRA;
			return( CRYPT_OK );
#endif /* USE_PKIUSER */

		case CRYPT_IATTRIBUTE_CERTKEYALGO:
			*certInfo = certInfoPtr->publicKeyAlgo;
			return( CRYPT_OK );

		case CRYPT_IATTRIBUTE_CERTHASHALGO:
			*certInfo = certInfoPtr->cCertCert->hashAlgo;
			return( CRYPT_OK );

#ifdef USE_CERTREQ
		case CRYPT_IATTRIBUTE_REQFROMRA:
			*certInfo = certInfoPtr->cCertReq->requestFromRA;
			return( CRYPT_OK );
#endif /* USE_CERTREQ */

		case CRYPT_IATTRIBUTE_CERTCOPY:
			{
			CRYPT_CERTIFICATE certCopy;

			status = getCertCopy( certInfoPtr, &certCopy, FALSE );
			if( cryptStatusError( status ) )
				return( status );
			*certInfo = certCopy;
			return( CRYPT_OK );
			}
		case CRYPT_IATTRIBUTE_CERTCOPY_DATAONLY:
			{
			CRYPT_CERTIFICATE certCopy;

			status = getCertCopy( certInfoPtr, &certCopy, TRUE );
			if( cryptStatusError( status ) )
				return( status );
			*certInfo = certCopy;
			return( CRYPT_OK );
			}
		}

	retIntError();
	}
#endif /* USE_CERTIFICATES */
