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acl_comment.h

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All Rights Reserved.
 * 
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
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//
// acl_comment - "ignore" ACL subject type
//
// This subject will never match anything - its presence is effectively ignored.
// Its usefulness lies in the fact that COMMENT type ACL subjects are valid ACL
// subjects that preserve their contents as uninterpreted data blobs. This allows
// you to keep information in an ACL that can be retrieved later. In particular,
// you can "prefix" any external ACL subject representation with an ACL_COMMENT
// header, which turns it into an inactive comment until you remove the prefix.
//
// Notes: 
// (1) All contents of a comment ACL are public.
// (2) While there is a COMMENT sample type, it is in no way related to this subject
//     type. Validation of a COMMENT acl subject never examines any samples.
//
#ifndef _ACL_COMMENT
#define _ACL_COMMENT

#include <security_cdsa_utilities/cssmacl.h>


namespace Security
{

//
// The ANY subject simply matches everything. No sweat.
//
class CommentAclSubject : public AclSubject {
public:
      CommentAclSubject::CommentAclSubject(CSSM_LIST *list, uint32 size)
      : AclSubject(CSSM_ACL_SUBJECT_TYPE_COMMENT), mComment(list), mSize(size) { }
      ~CommentAclSubject() { Allocator::standard().free(mComment); }
      
      bool validate(const AclValidationContext &ctx) const;
      CssmList toList(Allocator &alloc) const;

    void exportBlob(Writer::Counter &pub, Writer::Counter &priv);
    void exportBlob(Writer &pub, Writer &priv);

      class Maker : public AclSubject::Maker {
      public:
            Maker() : AclSubject::Maker(CSSM_ACL_SUBJECT_TYPE_COMMENT) { }
            CommentAclSubject *make(const TypedList &list) const;
      CommentAclSubject *make(Version, Reader &pub, Reader &priv) const;
      };
      
      IFDUMP(void debugDump() const);
      
private:
      CSSM_LIST *mComment;          // list form preserved
      uint32 mSize;                       // size of mComment blob
};

} // end namespace Security


#endif //_ACL_COMMENT

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