<h2>Editing File: /usr/include/sepol/policydb/context.h</h2><form method='post'><textarea name='content' class='file-edit'>/* Author : Stephen Smalley, &lt;sds@tycho.nsa.gov&gt; */

/* 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 &lt;stddef.h&gt;
#include &lt;sepol/policydb/ebitmap.h&gt;
#include &lt;sepol/policydb/mls_types.h&gt;

#ifdef __cplusplus
extern &quot;C&quot; {
#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(&amp;c-&gt;range);
}

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

	if (mls_range_cpy(&amp;dst-&gt;range, &amp;src-&gt;range) &lt; 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, context_struct_t *src)
{
	int rc;

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

	dst-&gt;range.level[1].sens = src-&gt;range.level[0].sens;
	rc = ebitmap_cpy(&amp;dst-&gt;range.level[1].cat, &amp;src-&gt;range.level[0].cat);
	if (rc)
		ebitmap_destroy(&amp;dst-&gt;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, context_struct_t *src)
{
	int rc;

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

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

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

}

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

	mls_range_destroy(&amp;c-&gt;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-&gt;user = src-&gt;user;
	dst-&gt;role = src-&gt;role;
	dst-&gt;type = src-&gt;type;
	return mls_context_cpy(dst, src);
}

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

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

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

#ifdef __cplusplus
}
#endif

#endif
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