hackedteam/core-android-native

/* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */

/* FLASK */

/*
 * A security context is a set of security attributes
 * associated with each subject and object controlled
 * by the security policy.  Security contexts are
 * externally represented as variable-length strings
 * that can be interpreted by a user or application
 * with an understanding of the security policy. 
 * Internally, the security server uses a simple
 * structure.  This structure is private to the
 * security server and can be changed without affecting
 * clients of the security server.
 */

#ifndef _SEPOL_POLICYDB_CONTEXT_H_
#define _SEPOL_POLICYDB_CONTEXT_H_

#include <stddef.h>
#include <sepol/policydb/ebitmap.h>
#include <sepol/policydb/mls_types.h>

/*
 * A security context consists of an authenticated user
 * identity, a role, a type and a MLS range.
 */
typedef struct context_struct {
    uint32_t user;
    uint32_t role;
    uint32_t type;
    mls_range_t range;
} context_struct_t;

static inline void mls_context_init(context_struct_t * c)
{
    mls_range_init(&c->range);
}

static inline int mls_context_cpy(context_struct_t * dst,
                  context_struct_t * src)
{

    if (mls_range_cpy(&dst->range, &src->range) < 0)
        return -1;

    return 0;
}

static inline int mls_context_cmp(context_struct_t * c1, context_struct_t * c2)
{
    return (mls_level_eq(&c1->range.level[0], &c2->range.level[0]) &&
        mls_level_eq(&c1->range.level[1], &c2->range.level[1]));

}

static inline void mls_context_destroy(context_struct_t * c)
{
    if (c == NULL)
        return;

    mls_range_destroy(&c->range);
    mls_context_init(c);
}

static inline void context_init(context_struct_t * c)
{
    memset(c, 0, sizeof(*c));
}

static inline int context_cpy(context_struct_t * dst, context_struct_t * src)
{
    dst->user = src->user;
    dst->role = src->role;
    dst->type = src->type;
    return mls_context_cpy(dst, src);
}

static inline void context_destroy(context_struct_t * c)
{
    if (c == NULL)
        return;

    c->user = c->role = c->type = 0;
    mls_context_destroy(c);
}

static inline int context_cmp(context_struct_t * c1, context_struct_t * c2)
{
    return ((c1->user == c2->user) &&
        (c1->role == c2->role) &&
        (c1->type == c2->type) && mls_context_cmp(c1, c2));
}

#endif