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150 lines
3.4 KiB
150 lines
3.4 KiB
/* Author : Stephen Smalley, <sds@tycho.nsa.gov> */
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/* FLASK */
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/*
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* A security context is a set of security attributes
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* associated with each subject and object controlled
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* by the security policy. Security contexts are
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* externally represented as variable-length strings
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* that can be interpreted by a user or application
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* with an understanding of the security policy.
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* Internally, the security server uses a simple
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* structure. This structure is private to the
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* security server and can be changed without affecting
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* clients of the security server.
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*/
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#ifndef _SEPOL_POLICYDB_CONTEXT_H_
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#define _SEPOL_POLICYDB_CONTEXT_H_
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#include <stddef.h>
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#include <sepol/policydb/ebitmap.h>
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#include <sepol/policydb/mls_types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* A security context consists of an authenticated user
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* identity, a role, a type and a MLS range.
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*/
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typedef struct context_struct {
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uint32_t user;
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uint32_t role;
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uint32_t type;
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mls_range_t range;
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} context_struct_t;
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static inline void mls_context_init(context_struct_t * c)
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{
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mls_range_init(&c->range);
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}
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static inline int mls_context_cpy(context_struct_t * dst,
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context_struct_t * src)
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{
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if (mls_range_cpy(&dst->range, &src->range) < 0)
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return -1;
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return 0;
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}
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/*
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* Sets both levels in the MLS range of 'dst' to the low level of 'src'.
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*/
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static inline int mls_context_cpy_low(context_struct_t *dst, context_struct_t *src)
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{
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int rc;
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dst->range.level[0].sens = src->range.level[0].sens;
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rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
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if (rc)
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goto out;
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dst->range.level[1].sens = src->range.level[0].sens;
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rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
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if (rc)
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ebitmap_destroy(&dst->range.level[0].cat);
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out:
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return rc;
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}
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/*
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* Sets both levels in the MLS range of 'dst' to the high level of 'src'.
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*/
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static inline int mls_context_cpy_high(context_struct_t *dst, context_struct_t *src)
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{
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int rc;
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dst->range.level[0].sens = src->range.level[1].sens;
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rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[1].cat);
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if (rc)
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goto out;
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dst->range.level[1].sens = src->range.level[1].sens;
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rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
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if (rc)
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ebitmap_destroy(&dst->range.level[0].cat);
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out:
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return rc;
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}
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static inline int mls_context_glblub(context_struct_t *dst, context_struct_t *c1, context_struct_t *c2)
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{
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return mls_range_glblub(&dst->range, &c1->range, &c2->range);
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}
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static inline int mls_context_cmp(context_struct_t * c1, context_struct_t * c2)
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{
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return (mls_level_eq(&c1->range.level[0], &c2->range.level[0]) &&
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mls_level_eq(&c1->range.level[1], &c2->range.level[1]));
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}
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static inline void mls_context_destroy(context_struct_t * c)
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{
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if (c == NULL)
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return;
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mls_range_destroy(&c->range);
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mls_context_init(c);
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}
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static inline void context_init(context_struct_t * c)
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{
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memset(c, 0, sizeof(*c));
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}
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static inline int context_cpy(context_struct_t * dst, context_struct_t * src)
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{
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dst->user = src->user;
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dst->role = src->role;
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dst->type = src->type;
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return mls_context_cpy(dst, src);
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}
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static inline void context_destroy(context_struct_t * c)
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{
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if (c == NULL)
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return;
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c->user = c->role = c->type = 0;
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mls_context_destroy(c);
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}
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static inline int context_cmp(context_struct_t * c1, context_struct_t * c2)
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{
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return ((c1->user == c2->user) &&
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(c1->role == c2->role) &&
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(c1->type == c2->type) && mls_context_cmp(c1, c2));
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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