xnu-7195.101.1.tar.gz

[apple/xnu.git] / security / mac_data.h

/*
 * Copyright (c) 2007 Apple Inc. All rights reserved.
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 * @APPLE_OSREFERENCE_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. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
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 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
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/*-
 * Copyright (c) 2006 SPARTA, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 */

#ifndef _SECURITY_MAC_DATA_H_
#define _SECURITY_MAC_DATA_H_

#ifndef PRIVATE
#warning "MAC policy is not KPI, see Technical Q&A QA1574, this header will be removed in next version"
#endif

/**
 *  @brief Mac policy module data
 *
 *  This structure specifies module data that is passed in to the
 *  TrustedBSD MAC policy module by the kernel module loader.  The
 *  data is made of up key/value pairs where the key is always a
 *  string and the value is a string, binary data or array.  An array
 *  may be a list of values (actually a similar set of key/value pairs,
 *  but in this case the keys are always null), and may also consist of
 *  a set of dictionaries, which in turn are made up of a list of key/value
 *  pairs.
 *
 *  Module data may be specified in the MAC policy module's
 *  Info.plist file as part of the OSModuleData dictionary.
 *
 *  E.g.
 *
 *  <key>OSModuleData</key>
 *  <dict>
 *       <key>foo</key>
 *       <string>bar</string>
 *       <key>Beers</key>
 *       <array>
 *       <dict>
 *               <key>type</key>
 *               <string>lager</string>
 *               <key>Name</key>
 *               <string>Anchor Steam</string>
 *       </dict>
 *       <dict>
 *               <key>type</key>
 *               <string>ale</string>
 *               <key>Name</key>
 *               <string>Sierra Nevada Pale Ale</string>
 *       </dict>
 *       </array>
 *  </dict>
 *
 */
struct mac_module_data_element {
	unsigned int key_size;
	unsigned int value_size;
	unsigned int value_type;
	char *key;
	char *value;
};
struct mac_module_data_list {
	unsigned int count;
	unsigned int type;
	struct mac_module_data_element list[1];
};
struct mac_module_data {
	void *base_addr;                /* Orig base address, for ptr fixup.  */
	unsigned int size;
	unsigned int count;
	struct mac_module_data_element data[1]; /* actually bigger */
};

#define MAC_DATA_TYPE_PRIMITIVE 0       /* Primitive type (int, string, etc.) */
#define MAC_DATA_TYPE_ARRAY     1       /* Array type.                        */
#define MAC_DATA_TYPE_DICT      2       /* Dictionary type.                   */

#ifdef _SECURITY_MAC_POLICY_H_
/* XXX mac_policy_handle_t is defined in mac_policy.h, move prototype there? */
int mac_find_policy_data(const mac_policy_handle_t, const char *key,
    void **valp, size_t *sizep);
int mac_find_module_data(struct mac_module_data *mmd, const char *key,
    void **valp, size_t *sizep);

/*
 * This is a routine to fix up pointers in a mac_module_data_element when the
 * mac_module_data has been copied to a new area.  It depends on the pointers
 * all being offset from base_addr.
 */
static __inline void
mmd_fixup_ele(struct mac_module_data *oldbase,
    struct mac_module_data *newbase, struct mac_module_data_element *ele)
{
	if (ele->key != NULL) {         /* Array elements have no keys.       */
		ele->key -= (uintptr_t)oldbase;
		ele->key += (uintptr_t)newbase;
	}
	ele->value -= (uintptr_t)oldbase;
	ele->value += (uintptr_t)newbase;
}

#endif

#endif /* !_SECURITY_MAC_DATA_H_ */