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/**
* @file
* Public interface for computing semantic differences in users.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
*
* Copyright (C) 2006-2007 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef POLDIFF_USER_DIFF_H
#define POLDIFF_USER_DIFF_H
#ifdef __cplusplus
extern "C"
{
#endif
#include <apol/vector.h>
#include <poldiff/poldiff.h>
typedef struct poldiff_user poldiff_user_t;
/**
* Get an array of statistics for the number of differences of each
* form for users.
*
* @param diff The policy difference structure from which to get the
* stats.
* @param stats Array into which to write the numbers (array must be
* pre-allocated). The order of the values written to the array is
* as follows: number of items of form POLDIFF_FORM_ADDED, number of
* POLDIFF_FORM_REMOVED, number of POLDIFF_FORM_MODIFIED, number of
* POLDIFF_FORM_ADD_TYPE, and number of POLDIFF_FORM_REMOVE_TYPE.
*/
extern void poldiff_user_get_stats(const poldiff_t * diff, size_t stats[5]);
/**
* Get the vector of user differences from the user difference
* summary.
*
* @param diff The policy difference structure associated with the
* user difference summary.
*
* @return A vector of elements of type poldiff_user_t, or NULL on
* error. The caller should <b>not</b> destroy the vector
* returned. If the call fails, errno will be set.
*/
extern const apol_vector_t *poldiff_get_user_vector(const poldiff_t * diff);
/**
* Obtain a newly allocated string representation of a difference in
* a user.
*
* @param diff The policy difference structure associated with the user.
* @param user The user from which to generate the string.
*
* @return A string representation of user difference; the caller is
* responsible for free()ing this string. On error, return NULL and
* set errno.
*/
extern char *poldiff_user_to_string(const poldiff_t * diff, const void *user);
/**
* Get the name of the user from a user diff.
*
* @param user The user from which to get the name.
*
* @return Name of the user on success and NULL on failure; if the
* call fails, errno will be set. The caller should not free the
* returned string.
*/
extern const char *poldiff_user_get_name(const poldiff_user_t * user);
/**
* Get the form of difference from a user diff.
*
* @param user The user from which to get the difference form.
*
* @return The form of difference (one of POLDIFF_FORM_*) or
* POLDIFF_FORM_NONE on error. If the call fails, errno will be set.
*/
extern poldiff_form_e poldiff_user_get_form(const void *user);
/**
* Get a vector of unmodified roles for the user.
*
* @param user The user diff from which to get the roles vector.
*
* @return A vector of role names (type char *) that are assigned to
* the user in the modified policy. If no roles were added the size
* of the returned vector will be 0. The caller must not destroy
* this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_user_get_unmodified_roles(const poldiff_user_t * user);
/**
* Get a vector of roles added to the user. If a user was added by
* the modified policy then this vector will hold all of the roles.
*
* @param user The user diff from which to get the roles vector.
*
* @return A vector of role names (type char *) that are assigned to
* the user in the modified policy. If no roles were added the size
* of the returned vector will be 0. The caller must not destroy
* this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_user_get_added_roles(const poldiff_user_t * user);
/**
* Get a vector of roles removed from the user. If a user was
* removed by the modified policy then this vector will hold all of
* the roles.
*
* @param user The user diff from which to get the roles vector.
*
* @return A vector of role names (type char *) that are assigned to
* the user in the original policy. If no roles were removed the
* size of the returned vector will be 0. The caller must not
* destroy this vector. On error, errno will be set.
*/
extern const apol_vector_t *poldiff_user_get_removed_roles(const poldiff_user_t * user);
/**
* Get the original user's default MLS level. That is, this is the
* level assigned to the user in the original policy. If the level
* has the form POLDIFF_FORM_MODIFIED, then this indiciates that the
* user had the same sensitivity between the two policies but
* different categories.
*
* If neither policy is MLS or there are no differences in default
* level, then the return value is NULL.
*
* @param user The user diff from which to get default level.
*
* @return User's original default MLS level. Returns NULL upon
* error or if there is no difference in level.
*/
extern const poldiff_level_t *poldiff_user_get_original_dfltlevel(const poldiff_user_t * user);
/**
* Get the modified user's MLS level. That is, this is the level
* assigned to the user in the modified policy. If the level had the
* same sensitivity but different categories call
* poldiff_user_get_original_dfltlevel() to get the difference; this
* function will return NULL.
*
* If neither policy is MLS or there are no differences in
* default level, then the return value is NULL.
*
* @param user The user diff from which to get default level.
*
* @return User's modified default MLS level. Returns NULL upon
* error, if there is no difference in level, or if the sensitivity
* was unchanged.
*/
extern const poldiff_level_t *poldiff_user_get_modified_dfltlevel(const poldiff_user_t * user);
/**
* Get the change in user's assigned MLS range.
*
* If neither policy is MLS or there are no differences in range,
* then the return value is NULL.
*
* @param user The user diff from which to get assigned range
* differences.
*
* @return User's MLS range differences. Returns NULL upon error or
* if there is no difference in range.
*/
extern const poldiff_range_t *poldiff_user_get_range(const poldiff_user_t * user);
#ifdef __cplusplus
}
#endif
#endif /* POLDIFF_USER_DIFF_H */
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