mdp.c

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/*
 *
 * mdp - make dummy policy
 *
 * When pointed at a kernel tree, builds a dummy policy for that kernel
 * with exactly one type with full rights to itself.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2006
 *
 * Authors: Serge E. Hallyn <[email protected]>
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

static void usage(char *name)
{
    printf("usage: %s [-m] policy_file context_file\n", name);
    exit(1);
}

/* Class/perm mapping support */
struct security_class_mapping {
    const char *name;
    const char *perms[sizeof(unsigned) * 8 + 1];
};

#include "classmap.h"
#include "initial_sid_to_string.h"

int main(int argc, char *argv[])
{
    int i, j, mls = 0;
    int initial_sid_to_string_len;
    char **arg, *polout, *ctxout;

    FILE *fout;

    if (argc < 3)
        usage(argv[0]);
    arg = argv+1;
    if (argc==4 && strcmp(argv[1], "-m") == 0) {
        mls = 1;
        arg++;
    }
    polout = *arg++;
    ctxout = *arg;

    fout = fopen(polout, "w");
    if (!fout) {
        printf("Could not open %s for writing\n", polout);
        usage(argv[0]);
    }

    /* print out the classes */
    for (i = 0; secclass_map[i].name; i++)
        fprintf(fout, "class %s\n", secclass_map[i].name);
    fprintf(fout, "\n");

    initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
    /* print out the sids */
    for (i = 1; i < initial_sid_to_string_len; i++)
        fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
    fprintf(fout, "\n");

    /* print out the class permissions */
    for (i = 0; secclass_map[i].name; i++) {
        struct security_class_mapping *map = &secclass_map[i];
        fprintf(fout, "class %s\n", map->name);
        fprintf(fout, "{\n");
        for (j = 0; map->perms[j]; j++)
            fprintf(fout, "\t%s\n", map->perms[j]);
        fprintf(fout, "}\n\n");
    }
    fprintf(fout, "\n");

    /* NOW PRINT OUT MLS STUFF */
    if (mls) {
        printf("MLS not yet implemented\n");
        exit(1);
    }

    /* types, roles, and allows */
    fprintf(fout, "type base_t;\n");
    fprintf(fout, "role base_r types { base_t };\n");
    for (i = 0; secclass_map[i].name; i++)
        fprintf(fout, "allow base_t base_t:%s *;\n",
            secclass_map[i].name);
    fprintf(fout, "user user_u roles { base_r };\n");
    fprintf(fout, "\n");

    /* default sids */
    for (i = 1; i < initial_sid_to_string_len; i++)
        fprintf(fout, "sid %s user_u:base_r:base_t\n", initial_sid_to_string[i]);
    fprintf(fout, "\n");

    fprintf(fout, "fs_use_xattr ext2 user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr ext3 user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr ext4 user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr jfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr xfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr reiserfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr jffs2 user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr gfs2 user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_xattr lustre user_u:base_r:base_t;\n");

    fprintf(fout, "fs_use_task eventpollfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_task pipefs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_task sockfs user_u:base_r:base_t;\n");

    fprintf(fout, "fs_use_trans mqueue user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_trans hugetlbfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n");
    fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n");

    fprintf(fout, "genfscon proc / user_u:base_r:base_t\n");

    fclose(fout);

    fout = fopen(ctxout, "w");
    if (!fout) {
        printf("Wrote policy, but cannot open %s for writing\n", ctxout);
        usage(argv[0]);
    }
    fprintf(fout, "/ user_u:base_r:base_t\n");
    fprintf(fout, "/.* user_u:base_r:base_t\n");
    fclose(fout);

    return 0;
}