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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * mdp - make dummy policy
5 *
6 * When pointed at a kernel tree, builds a dummy policy for that kernel
7 * with exactly one type with full rights to itself.
8 *
9 * Copyright (C) IBM Corporation, 2006
10 *
11 * Authors: Serge E. Hallyn <serue@us.ibm.com>
12 */
13
14
15/* NOTE: we really do want to use the kernel headers here */
16#define __EXPORTED_HEADERS__
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <unistd.h>
21#include <string.h>
22#include <linux/kconfig.h>
23
24static void usage(char *name)
25{
26 printf("usage: %s [-m] policy_file context_file\n", name);
27 exit(1);
28}
29
30/* Class/perm mapping support */
31struct security_class_mapping {
32 const char *name;
33 const char *perms[sizeof(unsigned) * 8 + 1];
34};
35
36#include "classmap.h"
37#include "initial_sid_to_string.h"
38#include "policycap_names.h"
39
40#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
41
42int main(int argc, char *argv[])
43{
44 int i, j, mls = 0;
45 int initial_sid_to_string_len;
46 char **arg, *polout, *ctxout;
47
48 FILE *fout;
49
50 if (argc < 3)
51 usage(argv[0]);
52 arg = argv+1;
53 if (argc==4 && strcmp(argv[1], "-m") == 0) {
54 mls = 1;
55 arg++;
56 }
57 polout = *arg++;
58 ctxout = *arg;
59
60 fout = fopen(polout, "w");
61 if (!fout) {
62 printf("Could not open %s for writing\n", polout);
63 usage(argv[0]);
64 }
65
66 /* print out the classes */
67 for (i = 0; secclass_map[i].name; i++)
68 fprintf(fout, "class %s\n", secclass_map[i].name);
69 fprintf(fout, "\n");
70
71 initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
72 /* print out the sids */
73 for (i = 1; i < initial_sid_to_string_len; i++) {
74 const char *name = initial_sid_to_string[i];
75
76 if (name)
77 fprintf(fout, "sid %s\n", name);
78 else
79 fprintf(fout, "sid unused%d\n", i);
80 }
81 fprintf(fout, "\n");
82
83 /* print out the class permissions */
84 for (i = 0; secclass_map[i].name; i++) {
85 const struct security_class_mapping *map = &secclass_map[i];
86 fprintf(fout, "class %s\n", map->name);
87 fprintf(fout, "{\n");
88 for (j = 0; map->perms[j]; j++)
89 fprintf(fout, "\t%s\n", map->perms[j]);
90 fprintf(fout, "}\n\n");
91 }
92 fprintf(fout, "\n");
93
94 /* print out mls declarations and constraints */
95 if (mls) {
96 fprintf(fout, "sensitivity s0;\n");
97 fprintf(fout, "sensitivity s1;\n");
98 fprintf(fout, "dominance { s0 s1 }\n");
99 fprintf(fout, "category c0;\n");
100 fprintf(fout, "category c1;\n");
101 fprintf(fout, "level s0:c0.c1;\n");
102 fprintf(fout, "level s1:c0.c1;\n");
103#define SYSTEMLOW "s0"
104#define SYSTEMHIGH "s1:c0.c1"
105 for (i = 0; secclass_map[i].name; i++) {
106 const struct security_class_mapping *map = &secclass_map[i];
107
108 fprintf(fout, "mlsconstrain %s {\n", map->name);
109 for (j = 0; map->perms[j]; j++)
110 fprintf(fout, "\t%s\n", map->perms[j]);
111 /*
112 * This requires all subjects and objects to be
113 * single-level (l2 eq h2), and that the subject
114 * level dominate the object level (h1 dom h2)
115 * in order to have any permissions to it.
116 */
117 fprintf(fout, "} (l2 eq h2 and h1 dom h2);\n\n");
118 }
119 }
120
121 /* enable all policy capabilities */
122 for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
123 fprintf(fout, "policycap %s;\n", selinux_policycap_names[i]);
124
125 /* types, roles, and allows */
126 fprintf(fout, "type base_t;\n");
127 fprintf(fout, "role base_r;\n");
128 fprintf(fout, "role base_r types { base_t };\n");
129 for (i = 0; secclass_map[i].name; i++)
130 fprintf(fout, "allow base_t base_t:%s *;\n",
131 secclass_map[i].name);
132 fprintf(fout, "user user_u roles { base_r }");
133 if (mls)
134 fprintf(fout, " level %s range %s - %s", SYSTEMLOW,
135 SYSTEMLOW, SYSTEMHIGH);
136 fprintf(fout, ";\n");
137
138#define SUBJUSERROLETYPE "user_u:base_r:base_t"
139#define OBJUSERROLETYPE "user_u:object_r:base_t"
140
141 /* default sids */
142 for (i = 1; i < initial_sid_to_string_len; i++) {
143 const char *name = initial_sid_to_string[i];
144
145 if (name)
146 fprintf(fout, "sid %s ", name);
147 else
148 fprintf(fout, "sid unused%d\n", i);
149 fprintf(fout, SUBJUSERROLETYPE "%s\n",
150 mls ? ":" SYSTEMLOW : "");
151 }
152 fprintf(fout, "\n");
153
154#define FS_USE(behavior, fstype) \
155 fprintf(fout, "fs_use_%s %s " OBJUSERROLETYPE "%s;\n", \
156 behavior, fstype, mls ? ":" SYSTEMLOW : "")
157
158 /*
159 * Filesystems whose inode labels can be fetched via getxattr.
160 */
161#ifdef CONFIG_EXT2_FS_SECURITY
162 FS_USE("xattr", "ext2");
163#endif
164#ifdef CONFIG_EXT4_FS_SECURITY
165#ifdef CONFIG_EXT4_USE_FOR_EXT2
166 FS_USE("xattr", "ext2");
167#endif
168 FS_USE("xattr", "ext3");
169 FS_USE("xattr", "ext4");
170#endif
171#ifdef CONFIG_JFS_SECURITY
172 FS_USE("xattr", "jfs");
173#endif
174#ifdef CONFIG_REISERFS_FS_SECURITY
175 FS_USE("xattr", "reiserfs");
176#endif
177#ifdef CONFIG_JFFS2_FS_SECURITY
178 FS_USE("xattr", "jffs2");
179#endif
180#ifdef CONFIG_XFS_FS
181 FS_USE("xattr", "xfs");
182#endif
183#ifdef CONFIG_GFS2_FS
184 FS_USE("xattr", "gfs2");
185#endif
186#ifdef CONFIG_BTRFS_FS
187 FS_USE("xattr", "btrfs");
188#endif
189#ifdef CONFIG_F2FS_FS_SECURITY
190 FS_USE("xattr", "f2fs");
191#endif
192#ifdef CONFIG_OCFS2_FS
193 FS_USE("xattr", "ocsfs2");
194#endif
195#ifdef CONFIG_OVERLAY_FS
196 FS_USE("xattr", "overlay");
197#endif
198#ifdef CONFIG_SQUASHFS_XATTR
199 FS_USE("xattr", "squashfs");
200#endif
201
202 /*
203 * Filesystems whose inodes are labeled from allocating task.
204 */
205 FS_USE("task", "pipefs");
206 FS_USE("task", "sockfs");
207
208 /*
209 * Filesystems whose inode labels are computed from both
210 * the allocating task and the superblock label.
211 */
212#ifdef CONFIG_UNIX98_PTYS
213 FS_USE("trans", "devpts");
214#endif
215#ifdef CONFIG_HUGETLBFS
216 FS_USE("trans", "hugetlbfs");
217#endif
218#ifdef CONFIG_TMPFS
219 FS_USE("trans", "tmpfs");
220#endif
221#ifdef CONFIG_DEVTMPFS
222 FS_USE("trans", "devtmpfs");
223#endif
224#ifdef CONFIG_POSIX_MQUEUE
225 FS_USE("trans", "mqueue");
226#endif
227
228#define GENFSCON(fstype, prefix) \
229 fprintf(fout, "genfscon %s %s " OBJUSERROLETYPE "%s\n", \
230 fstype, prefix, mls ? ":" SYSTEMLOW : "")
231
232 /*
233 * Filesystems whose inodes are labeled from path prefix match
234 * relative to the filesystem root. Depending on the filesystem,
235 * only a single label for all inodes may be supported. Here
236 * we list the filesystem types for which per-file labeling is
237 * supported using genfscon; any other filesystem type can also
238 * be added by only with a single entry for all of its inodes.
239 */
240#ifdef CONFIG_PROC_FS
241 GENFSCON("proc", "/");
242#endif
243#ifdef CONFIG_SECURITY_SELINUX
244 GENFSCON("selinuxfs", "/");
245#endif
246#ifdef CONFIG_SYSFS
247 GENFSCON("sysfs", "/");
248#endif
249#ifdef CONFIG_DEBUG_FS
250 GENFSCON("debugfs", "/");
251#endif
252#ifdef CONFIG_TRACING
253 GENFSCON("tracefs", "/");
254#endif
255#ifdef CONFIG_PSTORE
256 GENFSCON("pstore", "/");
257#endif
258 GENFSCON("cgroup", "/");
259 GENFSCON("cgroup2", "/");
260
261 fclose(fout);
262
263 fout = fopen(ctxout, "w");
264 if (!fout) {
265 printf("Wrote policy, but cannot open %s for writing\n", ctxout);
266 usage(argv[0]);
267 }
268 fprintf(fout, "/ " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
269 fprintf(fout, "/.* " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : "");
270 fclose(fout);
271
272 return 0;
273}
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}