scripts/selinux/mdp/mdp.c

   1 /*
   2  *
   3  * mdp - make dummy policy
   4  *
   5  * When pointed at a kernel tree, builds a dummy policy for that kernel
   6  * with exactly one type with full rights to itself.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  *
  22  * Copyright (C) IBM Corporation, 2006
  23  *
  24  * Authors: Serge E. Hallyn <serue@us.ibm.com>
  25  */
  26
  27
  28 /* NOTE: we really do want to use the kernel headers here */
  29 #define __EXPORTED_HEADERS__
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <string.h>
  35
  36 static void usage(char *name)
  37 {
  38         printf("usage: %s [-m] policy_file context_file\n", name);
  39         exit(1);
  40 }
  41
  42 /* Class/perm mapping support */
  43 struct security_class_mapping {
  44         const char *name;
  45         const char *perms[sizeof(unsigned) * 8 + 1];
  46 };
  47
  48 #include "classmap.h"
  49 #include "initial_sid_to_string.h"
  50
  51 int main(int argc, char *argv[])
  52 {
  53         int i, j, mls = 0;
  54         int initial_sid_to_string_len;
  55         char **arg, *polout, *ctxout;
  56
  57         FILE *fout;
  58
  59         if (argc < 3)
  60                 usage(argv[0]);
  61         arg = argv+1;
  62         if (argc==4 && strcmp(argv[1], "-m") == 0) {
  63                 mls = 1;
  64                 arg++;
  65         }
  66         polout = *arg++;
  67         ctxout = *arg;
  68
  69         fout = fopen(polout, "w");
  70         if (!fout) {
  71                 printf("Could not open %s for writing\n", polout);
  72                 usage(argv[0]);
  73         }
  74
  75         /* print out the classes */
  76         for (i = 0; secclass_map[i].name; i++)
  77                 fprintf(fout, "class %s\n", secclass_map[i].name);
  78         fprintf(fout, "\n");
  79
  80         initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
  81         /* print out the sids */
  82         for (i = 1; i < initial_sid_to_string_len; i++)
  83                 fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
  84         fprintf(fout, "\n");
  85
  86         /* print out the class permissions */
  87         for (i = 0; secclass_map[i].name; i++) {
  88                 struct security_class_mapping *map = &secclass_map[i];
  89                 fprintf(fout, "class %s\n", map->name);
  90                 fprintf(fout, "{\n");
  91                 for (j = 0; map->perms[j]; j++)
  92                         fprintf(fout, "\t%s\n", map->perms[j]);
  93                 fprintf(fout, "}\n\n");
  94         }
  95         fprintf(fout, "\n");
  96
  97         /* NOW PRINT OUT MLS STUFF */
  98         if (mls) {
  99                 printf("MLS not yet implemented\n");
 100                 exit(1);
 101         }
 102
 103         /* types, roles, and allows */
 104         fprintf(fout, "type base_t;\n");
 105         fprintf(fout, "role base_r;\n");
 106         fprintf(fout, "role base_r types { base_t };\n");
 107         for (i = 0; secclass_map[i].name; i++)
 108                 fprintf(fout, "allow base_t base_t:%s *;\n",
 109                         secclass_map[i].name);
 110         fprintf(fout, "user user_u roles { base_r };\n");
 111         fprintf(fout, "\n");
 112
 113         /* default sids */
 114         for (i = 1; i < initial_sid_to_string_len; i++)
 115                 fprintf(fout, "sid %s user_u:base_r:base_t\n", initial_sid_to_string[i]);
 116         fprintf(fout, "\n");
 117
 118         fprintf(fout, "fs_use_xattr ext2 user_u:base_r:base_t;\n");
 119         fprintf(fout, "fs_use_xattr ext3 user_u:base_r:base_t;\n");
 120         fprintf(fout, "fs_use_xattr ext4 user_u:base_r:base_t;\n");
 121         fprintf(fout, "fs_use_xattr jfs user_u:base_r:base_t;\n");
 122         fprintf(fout, "fs_use_xattr xfs user_u:base_r:base_t;\n");
 123         fprintf(fout, "fs_use_xattr reiserfs user_u:base_r:base_t;\n");
 124         fprintf(fout, "fs_use_xattr jffs2 user_u:base_r:base_t;\n");
 125         fprintf(fout, "fs_use_xattr gfs2 user_u:base_r:base_t;\n");
 126         fprintf(fout, "fs_use_xattr lustre user_u:base_r:base_t;\n");
 127
 128         fprintf(fout, "fs_use_task eventpollfs user_u:base_r:base_t;\n");
 129         fprintf(fout, "fs_use_task pipefs user_u:base_r:base_t;\n");
 130         fprintf(fout, "fs_use_task sockfs user_u:base_r:base_t;\n");
 131
 132         fprintf(fout, "fs_use_trans mqueue user_u:base_r:base_t;\n");
 133         fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n");
 134         fprintf(fout, "fs_use_trans hugetlbfs user_u:base_r:base_t;\n");
 135         fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n");
 136         fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n");
 137
 138         fprintf(fout, "genfscon proc / user_u:base_r:base_t\n");
 139
 140         fclose(fout);
 141
 142         fout = fopen(ctxout, "w");
 143         if (!fout) {
 144                 printf("Wrote policy, but cannot open %s for writing\n", ctxout);
 145                 usage(argv[0]);
 146         }
 147         fprintf(fout, "/ user_u:base_r:base_t\n");
 148         fprintf(fout, "/.* user_u:base_r:base_t\n");
 149         fclose(fout);
 150
 151         return 0;
 152 }