/src/selinux/DESTDIR/usr/include/sepol/policydb/context.h

Source
/* Author : Stephen Smalley, <stephen.smalley.work@gmail.com> */

/* 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>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * 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,
          const context_struct_t *src)
{
  if (mls_range_cpy(&dst->range, &src->range) < 0)
    return -1;

  return 0;
}

/*
 * Sets both levels in the MLS range of 'dst' to the low level of 'src'.
 */
static inline int mls_context_cpy_low(context_struct_t *dst,
              const context_struct_t *src)
{
  int rc;

  dst->range.level[0].sens = src->range.level[0].sens;
  rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
  if (rc)
    goto out;

  dst->range.level[1].sens = src->range.level[0].sens;
  rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
  if (rc)
    ebitmap_destroy(&dst->range.level[0].cat);
out:
  return rc;
}

/*
 * Sets both levels in the MLS range of 'dst' to the high level of 'src'.
 */
static inline int mls_context_cpy_high(context_struct_t *dst,
               const context_struct_t *src)
{
  int rc;

  dst->range.level[0].sens = src->range.level[1].sens;
  rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[1].cat);
  if (rc)
    goto out;

  dst->range.level[1].sens = src->range.level[1].sens;
  rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
  if (rc)
    ebitmap_destroy(&dst->range.level[0].cat);
out:
  return rc;
}

static inline int mls_context_glblub(context_struct_t *dst,
             const context_struct_t *c1,
             const context_struct_t *c2)
{
  return mls_range_glblub(&dst->range, &c1->range, &c2->range);
}

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

#ifdef __cplusplus
}
#endif

#endif

Coverage Report

Created: 2026-07-16 06:25