LXR linux/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#include <sys/socket.h>
  36
  37static void usage(char *name)
  38{
  39        printf("usage: %s [-m] policy_file context_file\n", name);
  40        exit(1);
  41}
  42
  43/* Class/perm mapping support */
  44struct security_class_mapping {
  45        const char *name;
  46        const char *perms[sizeof(unsigned) * 8 + 1];
  47};
  48
  49#include "classmap.h"
  50#include "initial_sid_to_string.h"
  51
  52int main(int argc, char *argv[])
  53{
  54        int i, j, mls = 0;
  55        int initial_sid_to_string_len;
  56        char **arg, *polout, *ctxout;
  57
  58        FILE *fout;
  59
  60        if (argc < 3)
  61                usage(argv[0]);
  62        arg = argv+1;
  63        if (argc==4 && strcmp(argv[1], "-m") == 0) {
  64                mls = 1;
  65                arg++;
  66        }
  67        polout = *arg++;
  68        ctxout = *arg;
  69
  70        fout = fopen(polout, "w");
  71        if (!fout) {
  72                printf("Could not open %s for writing\n", polout);
  73                usage(argv[0]);
  74        }
  75
  76        /* print out the classes */
  77        for (i = 0; secclass_map[i].name; i++)
  78                fprintf(fout, "class %s\n", secclass_map[i].name);
  79        fprintf(fout, "\n");
  80
  81        initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
  82        /* print out the sids */
  83        for (i = 1; i < initial_sid_to_string_len; i++)
  84                fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
  85        fprintf(fout, "\n");
  86
  87        /* print out the class permissions */
  88        for (i = 0; secclass_map[i].name; i++) {
  89                struct security_class_mapping *map = &secclass_map[i];
  90                fprintf(fout, "class %s\n", map->name);
  91                fprintf(fout, "{\n");
  92                for (j = 0; map->perms[j]; j++)
  93                        fprintf(fout, "\t%s\n", map->perms[j]);
  94                fprintf(fout, "}\n\n");
  95        }
  96        fprintf(fout, "\n");
  97
  98        /* NOW PRINT OUT MLS STUFF */
  99        if (mls) {
 100                printf("MLS not yet implemented\n");
 101                exit(1);
 102        }
 103
 104        /* types, roles, and allows */
 105        fprintf(fout, "type base_t;\n");
 106        fprintf(fout, "role base_r;\n");
 107        fprintf(fout, "role base_r types { base_t };\n");
 108        for (i = 0; secclass_map[i].name; i++)
 109                fprintf(fout, "allow base_t base_t:%s *;\n",
 110                        secclass_map[i].name);
 111        fprintf(fout, "user user_u roles { base_r };\n");
 112        fprintf(fout, "\n");
 113
 114        /* default sids */
 115        for (i = 1; i < initial_sid_to_string_len; i++)
 116                fprintf(fout, "sid %s user_u:base_r:base_t\n", initial_sid_to_string[i]);
 117        fprintf(fout, "\n");
 118
 119        fprintf(fout, "fs_use_xattr ext2 user_u:base_r:base_t;\n");
 120        fprintf(fout, "fs_use_xattr ext3 user_u:base_r:base_t;\n");
 121        fprintf(fout, "fs_use_xattr ext4 user_u:base_r:base_t;\n");
 122        fprintf(fout, "fs_use_xattr jfs user_u:base_r:base_t;\n");
 123        fprintf(fout, "fs_use_xattr xfs user_u:base_r:base_t;\n");
 124        fprintf(fout, "fs_use_xattr reiserfs user_u:base_r:base_t;\n");
 125        fprintf(fout, "fs_use_xattr jffs2 user_u:base_r:base_t;\n");
 126        fprintf(fout, "fs_use_xattr gfs2 user_u:base_r:base_t;\n");
 127        fprintf(fout, "fs_use_xattr lustre user_u:base_r:base_t;\n");
 128
 129        fprintf(fout, "fs_use_task eventpollfs user_u:base_r:base_t;\n");
 130        fprintf(fout, "fs_use_task pipefs user_u:base_r:base_t;\n");
 131        fprintf(fout, "fs_use_task sockfs user_u:base_r:base_t;\n");
 132
 133        fprintf(fout, "fs_use_trans mqueue user_u:base_r:base_t;\n");
 134        fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n");
 135        fprintf(fout, "fs_use_trans hugetlbfs user_u:base_r:base_t;\n");
 136        fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n");
 137        fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n");
 138
 139        fprintf(fout, "genfscon proc / user_u:base_r:base_t\n");
 140
 141        fclose(fout);
 142
 143        fout = fopen(ctxout, "w");
 144        if (!fout) {
 145                printf("Wrote policy, but cannot open %s for writing\n", ctxout);
 146                usage(argv[0]);
 147        }
 148        fprintf(fout, "/ user_u:base_r:base_t\n");
 149        fprintf(fout, "/.* user_u:base_r:base_t\n");
 150        fclose(fout);
 151
 152        return 0;
 153}
 154