security/selinux/ss/mls.h

   1 /*
   2  * Multi-level security (MLS) policy operations.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6 /*
   7  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   8  *
   9  *      Support for enhanced MLS infrastructure.
  10  *
  11  * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
  12  */
  13 /*
  14  * Updated: Hewlett-Packard <paul.moore@hp.com>
  15  *
  16  *      Added support to import/export the MLS label
  17  *
  18  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  19  */
  20
  21 #ifndef _SS_MLS_H_
  22 #define _SS_MLS_H_
  23
  24 #include "context.h"
  25 #include "policydb.h"
  26
  27 /*
  28  * Copies the MLS range from `src' into `dst'.
  29  */
  30 static inline int mls_copy_context(struct context *dst,
  31                                    struct context *src)
  32 {
  33         int l, rc = 0;
  34
  35         /* Copy the MLS range from the source context */
  36         for (l = 0; l < 2; l++) {
  37                 dst->range.level[l].sens = src->range.level[l].sens;
  38                 rc = ebitmap_cpy(&dst->range.level[l].cat,
  39                                  &src->range.level[l].cat);
  40                 if (rc)
  41                         break;
  42         }
  43
  44         return rc;
  45 }
  46
  47 int mls_compute_context_len(struct context *context);
  48 void mls_sid_to_context(struct context *context, char **scontext);
  49 int mls_context_isvalid(struct policydb *p, struct context *c);
  50
  51 int mls_context_to_sid(char oldc,
  52                        char **scontext,
  53                        struct context *context,
  54                        struct sidtab *s,
  55                        u32 def_sid);
  56
  57 int mls_from_string(char *str, struct context *context, gfp_t gfp_mask);
  58
  59 int mls_convert_context(struct policydb *oldp,
  60                         struct policydb *newp,
  61                         struct context *context);
  62
  63 int mls_compute_sid(struct context *scontext,
  64                     struct context *tcontext,
  65                     u16 tclass,
  66                     u32 specified,
  67                     struct context *newcontext);
  68
  69 int mls_setup_user_range(struct context *fromcon, struct user_datum *user,
  70                          struct context *usercon);
  71
  72 void mls_export_lvl(const struct context *context, u32 *low, u32 *high);
  73 void mls_import_lvl(struct context *context, u32 low, u32 high);
  74
  75 int mls_export_cat(const struct context *context,
  76                    unsigned char **low,
  77                    size_t *low_len,
  78                    unsigned char **high,
  79                    size_t *high_len);
  80 int mls_import_cat(struct context *context,
  81                    const unsigned char *low,
  82                    size_t low_len,
  83                    const unsigned char *high,
  84                    size_t high_len);
  85
  86 #endif  /* _SS_MLS_H */
  87