274 lines
6.7 KiB
C
274 lines
6.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* mdp - make dummy policy
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*
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* When pointed at a kernel tree, builds a dummy policy for that kernel
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* with exactly one type with full rights to itself.
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*
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* Copyright (C) IBM Corporation, 2006
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*
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* Authors: Serge E. Hallyn <serue@us.ibm.com>
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*/
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/* NOTE: we really do want to use the kernel headers here */
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#define __EXPORTED_HEADERS__
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <linux/kconfig.h>
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static void usage(char *name)
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{
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printf("usage: %s [-m] policy_file context_file\n", name);
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exit(1);
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}
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/* Class/perm mapping support */
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struct security_class_mapping {
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const char *name;
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const char *perms[sizeof(unsigned) * 8 + 1];
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};
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#include "classmap.h"
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#include "initial_sid_to_string.h"
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#include "policycap_names.h"
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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int main(int argc, char *argv[])
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{
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int i, j, mls = 0;
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int initial_sid_to_string_len;
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char **arg, *polout, *ctxout;
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FILE *fout;
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if (argc < 3)
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usage(argv[0]);
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arg = argv+1;
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if (argc==4 && strcmp(argv[1], "-m") == 0) {
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mls = 1;
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arg++;
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}
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polout = *arg++;
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ctxout = *arg;
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fout = fopen(polout, "w");
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if (!fout) {
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printf("Could not open %s for writing\n", polout);
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usage(argv[0]);
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}
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/* print out the classes */
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for (i = 0; secclass_map[i].name; i++)
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fprintf(fout, "class %s\n", secclass_map[i].name);
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fprintf(fout, "\n");
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initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
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/* print out the sids */
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for (i = 1; i < initial_sid_to_string_len; i++) {
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const char *name = initial_sid_to_string[i];
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if (name)
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fprintf(fout, "sid %s\n", name);
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else
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fprintf(fout, "sid unused%d\n", i);
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}
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fprintf(fout, "\n");
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/* print out the class permissions */
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for (i = 0; secclass_map[i].name; i++) {
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struct security_class_mapping *map = &secclass_map[i];
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fprintf(fout, "class %s\n", map->name);
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fprintf(fout, "{\n");
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for (j = 0; map->perms[j]; j++)
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fprintf(fout, "\t%s\n", map->perms[j]);
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fprintf(fout, "}\n\n");
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}
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fprintf(fout, "\n");
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/* print out mls declarations and constraints */
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if (mls) {
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fprintf(fout, "sensitivity s0;\n");
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fprintf(fout, "sensitivity s1;\n");
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fprintf(fout, "dominance { s0 s1 }\n");
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fprintf(fout, "category c0;\n");
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fprintf(fout, "category c1;\n");
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fprintf(fout, "level s0:c0.c1;\n");
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fprintf(fout, "level s1:c0.c1;\n");
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#define SYSTEMLOW "s0"
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#define SYSTEMHIGH "s1:c0.c1"
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for (i = 0; secclass_map[i].name; i++) {
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struct security_class_mapping *map = &secclass_map[i];
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fprintf(fout, "mlsconstrain %s {\n", map->name);
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for (j = 0; map->perms[j]; j++)
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fprintf(fout, "\t%s\n", map->perms[j]);
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/*
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* This requires all subjects and objects to be
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* single-level (l2 eq h2), and that the subject
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* level dominate the object level (h1 dom h2)
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* in order to have any permissions to it.
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*/
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fprintf(fout, "} (l2 eq h2 and h1 dom h2);\n\n");
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}
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}
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/* enable all policy capabilities */
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for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
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fprintf(fout, "policycap %s;\n", selinux_policycap_names[i]);
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/* types, roles, and allows */
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fprintf(fout, "type base_t;\n");
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fprintf(fout, "role base_r;\n");
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fprintf(fout, "role base_r types { base_t };\n");
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for (i = 0; secclass_map[i].name; i++)
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fprintf(fout, "allow base_t base_t:%s *;\n",
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secclass_map[i].name);
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fprintf(fout, "user user_u roles { base_r }");
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if (mls)
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fprintf(fout, " level %s range %s - %s", SYSTEMLOW,
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SYSTEMLOW, SYSTEMHIGH);
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fprintf(fout, ";\n");
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#define SUBJUSERROLETYPE "user_u:base_r:base_t"
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#define OBJUSERROLETYPE "user_u:object_r:base_t"
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/* default sids */
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for (i = 1; i < initial_sid_to_string_len; i++) {
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const char *name = initial_sid_to_string[i];
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if (name)
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fprintf(fout, "sid %s ", name);
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else
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fprintf(fout, "sid unused%d\n", i);
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fprintf(fout, SUBJUSERROLETYPE "%s\n",
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mls ? ":" SYSTEMLOW : "");
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}
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fprintf(fout, "\n");
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#define FS_USE(behavior, fstype) \
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fprintf(fout, "fs_use_%s %s " OBJUSERROLETYPE "%s;\n", \
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behavior, fstype, mls ? ":" SYSTEMLOW : "")
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/*
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* Filesystems whose inode labels can be fetched via getxattr.
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*/
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#ifdef CONFIG_EXT2_FS_SECURITY
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FS_USE("xattr", "ext2");
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#endif
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#ifdef CONFIG_EXT4_FS_SECURITY
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#ifdef CONFIG_EXT4_USE_FOR_EXT2
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FS_USE("xattr", "ext2");
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#endif
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FS_USE("xattr", "ext3");
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FS_USE("xattr", "ext4");
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#endif
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#ifdef CONFIG_JFS_SECURITY
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FS_USE("xattr", "jfs");
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#endif
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#ifdef CONFIG_REISERFS_FS_SECURITY
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FS_USE("xattr", "reiserfs");
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#endif
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#ifdef CONFIG_JFFS2_FS_SECURITY
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FS_USE("xattr", "jffs2");
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#endif
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#ifdef CONFIG_XFS_FS
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FS_USE("xattr", "xfs");
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#endif
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#ifdef CONFIG_GFS2_FS
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FS_USE("xattr", "gfs2");
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#endif
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#ifdef CONFIG_BTRFS_FS
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FS_USE("xattr", "btrfs");
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#endif
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#ifdef CONFIG_F2FS_FS_SECURITY
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FS_USE("xattr", "f2fs");
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#endif
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#ifdef CONFIG_OCFS2_FS
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FS_USE("xattr", "ocsfs2");
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#endif
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#ifdef CONFIG_OVERLAY_FS
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FS_USE("xattr", "overlay");
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#endif
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#ifdef CONFIG_SQUASHFS_XATTR
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FS_USE("xattr", "squashfs");
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#endif
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/*
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* Filesystems whose inodes are labeled from allocating task.
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*/
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FS_USE("task", "pipefs");
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FS_USE("task", "sockfs");
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/*
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* Filesystems whose inode labels are computed from both
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* the allocating task and the superblock label.
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*/
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#ifdef CONFIG_UNIX98_PTYS
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FS_USE("trans", "devpts");
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#endif
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#ifdef CONFIG_HUGETLBFS
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FS_USE("trans", "hugetlbfs");
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#endif
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#ifdef CONFIG_TMPFS
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FS_USE("trans", "tmpfs");
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#endif
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#ifdef CONFIG_DEVTMPFS
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FS_USE("trans", "devtmpfs");
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#endif
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#ifdef CONFIG_POSIX_MQUEUE
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FS_USE("trans", "mqueue");
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#endif
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#define GENFSCON(fstype, prefix) \
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fprintf(fout, "genfscon %s %s " OBJUSERROLETYPE "%s\n", \
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fstype, prefix, mls ? ":" SYSTEMLOW : "")
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/*
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* Filesystems whose inodes are labeled from path prefix match
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* relative to the filesystem root. Depending on the filesystem,
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* only a single label for all inodes may be supported. Here
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* we list the filesystem types for which per-file labeling is
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* supported using genfscon; any other filesystem type can also
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* be added by only with a single entry for all of its inodes.
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*/
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#ifdef CONFIG_PROC_FS
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GENFSCON("proc", "/");
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#endif
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#ifdef CONFIG_SECURITY_SELINUX
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GENFSCON("selinuxfs", "/");
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#endif
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#ifdef CONFIG_SYSFS
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GENFSCON("sysfs", "/");
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#endif
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#ifdef CONFIG_DEBUG_FS
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GENFSCON("debugfs", "/");
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#endif
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#ifdef CONFIG_TRACING
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GENFSCON("tracefs", "/");
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#endif
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#ifdef CONFIG_PSTORE
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GENFSCON("pstore", "/");
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#endif
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GENFSCON("cgroup", "/");
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GENFSCON("cgroup2", "/");
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fclose(fout);
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fout = fopen(ctxout, "w");
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if (!fout) {
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printf("Wrote policy, but cannot open %s for writing\n", ctxout);
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usage(argv[0]);
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}
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fprintf(fout, "/ " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
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fprintf(fout, "/.* " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
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fclose(fout);
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return 0;
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}
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